JP2006078014A - Refrigerating device - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a refrigerating device capable of refrigerating inside of the device with only a required cooling heat exchanger and capable of adjusting refrigerating capacity of each cooling heat exchanger respectively, in the refrigerating device provided with a plurality of cooling heat exchangers in a refrigerant circuit serially. <P>SOLUTION: First and second cooling heat exchangers 131, 141 for respectively cooling inside of the device and first and second expansion mechanisms 132, 142 for respective cooling heat exchangers 131, 141 are provided in the refrigerant circuit 20. In addition, a bypass tube 133 with an end connected to a flow-in end of the first expansion mechanism 132 and the other end connected between the first cooling heat exchanger 131 and the second expansion mechanism 142 is provided in the refrigerant circuit 20. During normal operation, refrigerant is distributed in the first and the second cooling heat exchangers 131, 141 and cooling capacity of the respective cooling heat exchangers 131, 141 is adjusted by the first and the second expansion mechanisms 132, 142. When it is not necessary to cool the first cooling heat exchanger 131, the refrigerant is distributed to the second cooling heat exchanger 141 through the bypass tube 133 and cooling capacity of the second cooling heat exchanger 141 is adjusted by the second expansion mechanism 142. <P>COPYRIGHT: (C)2006,JPO&NCIPI

Description

  The present invention relates to a refrigeration apparatus in which a plurality of heat exchangers for cooling the interior of a refrigerator circuit are provided in series.

  Conventionally, a refrigeration apparatus for individually cooling a plurality of warehouses has been proposed. For example, in the refrigeration apparatus (200) of Patent Document 1 shown in FIG. 12, the first cooling heat exchange for individually cooling the two chambers to the refrigerant circuit (210) that performs the vapor compression refrigeration cycle by circulating the refrigerant. The vessel (221) and the second cooling heat exchanger (222) are connected in series. The refrigerant circuit (210) is provided with a compressor (223), an outdoor heat exchanger (224), and a first capillary tube (225) as an expansion mechanism. Further, in the refrigerant circuit (210), the refrigerant that has been depressurized through the first capillary tube (225) bypasses the first cooling heat exchanger (221) and passes to the second cooling heat exchanger (222). A bypass pipe (226) is provided for sending. The bypass pipe (226) is provided with a second capillary tube (227) that gives a predetermined resistance to the refrigerant flowing through the bypass pipe (226). In addition, a pipe between the first cooling heat exchanger (221) and the second cooling heat exchanger (222) is connected to the second cooling heat exchanger (222) from the first cooling heat exchanger (221). A flow rate adjustment valve (228) for adjusting the refrigerant flow rate is provided.

  During operation of the refrigeration apparatus (200) having the above configuration, the refrigerant compressed by the compressor (223) dissipates heat into the air and condenses in the outdoor heat exchanger (224). The refrigerant condensed in the outdoor heat exchanger (224) is depressurized to a predetermined pressure by the first capillary tube (225).

  Here, during the normal operation of the refrigeration apparatus (200), the flow rate adjustment valve (228) is opened to a predetermined opening. As a result, the refrigerant decompressed by the first capillary tube (225) flows through the first cooling heat exchanger (221). In the first cooling heat exchanger (221), the refrigerant absorbs heat from the internal air and evaporates. The refrigerant evaporated in the first cooling heat exchanger (221) passes through the second cooling heat exchanger (222) after passing through the flow rate adjustment valve (228). In the second cooling heat exchanger (222), the refrigerant absorbs heat from the internal air and further evaporates. As described above, the refrigeration apparatus (200) opens the flow rate adjustment valve (228) during normal operation, whereby the refrigerant is supplied in the order of the first cooling heat exchanger (221) and the second cooling heat exchanger (222). It is made to distribute | circulate and the inside of a store | warehouse | chamber is cooled in both cooling heat exchangers (221, 222).

  On the other hand, in the refrigeration apparatus (200), when the interior of the refrigerator is sufficiently cooled by the first cooling heat exchanger (221) and the cooling of the first cooling heat exchanger (221) becomes unnecessary, the flow rate is adjusted. The valve (228) is fully closed. As a result, the refrigerant decompressed by the first capillary tube (225) passes through the bypass pipe (226) and the second capillary tube (227), bypasses the first cooling heat exchanger (221), and performs the second cooling. It flows into the heat exchanger (222). Therefore, in this operation, the inside of the warehouse is not cooled by the first cooling heat exchanger (221), and only the second cooling heat exchanger (222) cools the inside of the warehouse.

  Thus, the refrigeration apparatus (200) of Patent Document 1 connects the bypass pipe (226) to the downstream side of the first capillary tube (225), which is an expansion mechanism, and distributes the refrigerant flow rate distributed to the bypass pipe (226). By adjusting with the flow rate adjusting valve (228), it is possible to avoid unnecessary cooling from being performed when the first cooling heat exchanger (221) does not require cooling in the cabinet.

As another refrigeration apparatus, a refrigeration apparatus such as that disclosed in Patent Document 2 is known. In this refrigeration apparatus, a refrigeration circuit having a refrigeration heat exchanger for cooling the inside of a refrigerator and a refrigeration circuit having a refrigeration heat exchanger for cooling the inside of the freezer are connected in parallel to a heat source side circuit having a main compressor. Yes. The refrigeration circuit is provided with a sub-compressor. The refrigerant circuit of the refrigeration apparatus constitutes a so-called two-stage compression refrigerant circuit in which the refrigeration circuit is on the high stage side and the refrigeration circuit is on the low stage side. That is, in this refrigeration apparatus, the refrigerant flowing through the refrigeration heat exchanger performs a refrigeration cycle using the main compressor as a heat source, and at the same time, the refrigerant flowing through the refrigeration heat exchanger is changed between the low-stage sub-compressor and the high-stage side The refrigeration cycle is performed using the main compressor as a heat source.
Japanese Patent Laid-Open No. 2002-147917 JP 2002-228297 A

  By the way, in the refrigeration apparatus in which a plurality of cooling heat exchangers (221, 222) are provided in series as in Patent Document 1, the refrigerant after the pressure is reduced by the first capillary tube (225) is used as the first cooling heat exchanger. It is made to distribute to the (221) side or the bypass pipe (226) side. Thus, for example, during the normal operation described above, the pressure of the refrigerant flowing into the first cooling heat exchanger (221) is determined by the resistance of the first capillary tube (225), and the refrigerant in the first cooling heat exchanger (221). It is difficult to adjust the evaporation pressure, that is, the cooling capacity.

  In addition, cooling in the cabinet by the first cooling heat exchanger (221) becomes unnecessary, and in the operation operation in which cooling is performed only by the second cooling heat exchanger (222), the cooling air flows into the second cooling heat exchanger (222). The pressure of the refrigerant to be determined is determined by the resistance of the first capillary tube (225) and the second capillary tube (227), and it is difficult to adjust the evaporation pressure in the second cooling heat exchanger (222), that is, the cooling capacity. Become. Further, during this operation, for example, it may be possible to adjust the flow rate of the refrigerant flowing through the bypass pipe (226) by opening a predetermined amount of the flow rate adjustment valve (228). In this case, the first cooling heat exchange is performed. Since a refrigerant | coolant distribute | circulates to a container (221), useless cooling will be performed in a 1st cooling heat exchanger (221).

  As described above, in the refrigeration apparatus of Patent Document 1, it is possible to perform cooling with only the necessary cooling heat exchanger by circulating the refrigerant through the bypass pipe (226). Since the adjustment of the cooling capacity is not easy, there is a problem that it becomes difficult to individually control the temperature in the plurality of warehouses.

  Such a problem is caused by, for example, a refrigeration apparatus having a so-called two-stage compression refrigerant circuit, such as the refrigeration apparatus of Patent Document 2, in which a cooling heat exchanger (refrigeration heat exchanger) for cooling the inside of the freezer is connected in series. This is also the case when a plurality are provided.

  The present invention has been made in view of the above points, and an object of the present invention is to store only a necessary cooling heat exchanger in a refrigeration apparatus in which a plurality of cooling heat exchangers are provided in series in a refrigerant circuit. It is possible to provide a refrigeration apparatus that can cool the inside and adjust the cooling capacity of each cooling heat exchanger individually.

  In the refrigeration apparatus in which a plurality of cooling heat exchangers are provided in series with the refrigerant circuit, the present invention provides a plurality of expansion mechanisms corresponding to the plurality of cooling heat exchangers and before the pressure is reduced by the expansion mechanism in the refrigerant circuit. The refrigerant is bypassed by a predetermined route.

  More specifically, the first invention provides a refrigerant circuit (20 having first and second cooling heat exchangers (131, 141), a compressor (41, 151), and an expansion mechanism (132, 142) for cooling different interiors. ) And the refrigerant circuit (20) is premised on a refrigeration apparatus in which the first and second cooling heat exchangers (131, 141) are connected in series. In the refrigeration apparatus, the expansion mechanism (132, 142) adjusts the refrigerant pressure flowing into the first cooling heat exchanger (131), the first expansion mechanism (132), and the second cooling heat exchanger ( 141) and a second expansion mechanism (142) for adjusting the refrigerant pressure flowing into the refrigerant circuit (20). One end of the refrigerant circuit (20) is connected to the inflow end of the first expansion mechanism (132), and the other end is A first bypass pipe (133) having a flow rate adjusting mechanism (SV-6, 137) is provided between the cooling heat exchanger (131) and the second expansion mechanism (142). .

  In the first aspect of the invention, the refrigeration apparatus is provided with the refrigerant circuit (20) that performs the vapor compression refrigeration cycle by circulating the refrigerant. The refrigerant circuit (20) is connected in series with first and second cooling heat exchangers (131, 141) for individually cooling different interiors. The refrigerant circuit (20) is provided with first and second expansion mechanisms (132, 142) corresponding to the respective cooling heat exchangers (131, 141).

  Here, during normal operation of the refrigeration system, the flow control mechanism (SV-6, 137) of the first bypass pipe (133) is fully closed, while the first expansion mechanism (132) is opened to a predetermined opening. Thus, after being compressed by the compressor (41, 151), for example, the refrigerant condensed by the outdoor heat exchanger can be caused to flow into the first expansion mechanism (132). At this time, the refrigerant pressure is adjusted to a predetermined pressure in accordance with the opening degree of the first expansion mechanism (132). The refrigerant decompressed by the first expansion mechanism (132) flows through the first cooling heat exchanger (131). In the first cooling heat exchanger (131), the refrigerant absorbs heat from the internal air and evaporates. For this reason, the interior is cooled to a predetermined temperature by the first cooling heat exchanger (131). The refrigerant that has flowed out of the first cooling heat exchanger (131) passes through the second expansion mechanism (142). At this time, the refrigerant pressure is adjusted to a predetermined pressure according to the opening degree of the second expansion mechanism (142). The refrigerant decompressed by the second expansion mechanism (142) flows through the second cooling heat exchanger (141). In the second cooling heat exchanger (141), the refrigerant absorbs heat from the internal air and further evaporates. For this reason, the inside of the warehouse is cooled to a predetermined temperature by the second cooling heat exchanger (141).

  As described above, in the normal operation in which the interior is cooled by the first and second cooling heat exchangers (131, 141), the refrigerant is prevented from being introduced into the first bypass pipe (133). The refrigerant can be circulated through the two-cooling heat exchanger (131, 141). At this time, the cooling capacity of the first cooling heat exchanger (131) is adjusted by the first expansion mechanism (132), and at the same time, the cooling capacity of the second cooling heat exchanger (141) is adjusted by the second expansion mechanism (142). can do.

  On the other hand, in this refrigeration apparatus, when the interior cooling by the first cooling heat exchanger (131) becomes unnecessary, the flow rate adjusting mechanism (SV-6, 137) of the first bypass pipe (133) is opened, By making the one expansion mechanism (132) fully closed, the condensed refrigerant can be introduced into the first bypass pipe (133). For this reason, the refrigerant does not flow through the first expansion mechanism (132) and the first cooling heat exchanger (131) but passes through the second expansion mechanism (142). At this time, the refrigerant pressure is adjusted to a predetermined pressure according to the opening degree of the second expansion mechanism (142). The refrigerant decompressed by the second expansion mechanism (142) flows through the second cooling heat exchanger (141). In the second cooling heat exchanger (141), the refrigerant absorbs heat from the internal air and evaporates. For this reason, the inside of the warehouse is cooled to a predetermined temperature by the second cooling heat exchanger (141).

  As described above, when cooling in the warehouse by the first cooling heat exchanger (131) becomes unnecessary, the second cooling heat exchanger (141) is introduced by introducing the refrigerant into the first bypass pipe (133). ) Only through the refrigerant. At this time, the cooling capacity of the second cooling heat exchanger (141) can be adjusted by the second expansion mechanism (142).

  According to a second aspect of the present invention, in the refrigeration apparatus of the first aspect, the first bypass pipe (133) is formed so as to be in contact with the heat transfer pipe of the first cooling heat exchanger (131). It is what has.

  In the second aspect of the invention, when the inside of the warehouse is sufficiently cooled by the first cooling heat exchanger (131) and the bypass operation for introducing the refrigerant into the first bypass pipe (133) is performed, the first bypass pipe (133) The heat of the refrigerant flowing through the heat is conducted to the first cooling heat exchanger (131) through the heat transfer section (133a). In other words, the relatively low temperature state, the interior air, and the refrigerant flowing through the first bypass pipe (133) exchange heat through the first cooling heat exchanger (131) and the heat transfer section (133a), and the first The refrigerant flowing through the bypass pipe (133) is cooled. Therefore, when the inside of the warehouse is cooled only by the second cooling heat exchanger (141), the supercooling of the refrigerant sent to the second cooling heat exchanger (141) is performed by the heat transfer of the first bypass pipe (133). Part (133a).

  The third invention comprises a refrigerant circuit (20) having first and second cooling heat exchangers (131, 141), a compressor (41, 151), and an expansion mechanism (132, 142) for cooling different interiors, The refrigerant circuit (20) is premised on a refrigeration apparatus in which the first and second cooling heat exchangers (131, 141) are connected in series. In the refrigeration apparatus, the expansion mechanism (132, 142) adjusts the refrigerant pressure flowing into the first cooling heat exchanger (131), the first expansion mechanism (132), and the second cooling heat exchanger ( 141) and a second expansion mechanism (142) for adjusting the refrigerant pressure flowing into the refrigerant circuit (20). One end of the refrigerant circuit (20) is connected to the inflow end of the first expansion mechanism (132), and the other end is A first bypass pipe (133) having a flow rate adjusting mechanism (SV-6, 137) is provided between the first expansion mechanism (132) and the first cooling heat exchanger (131). .

  In the third aspect, the first bypass pipe (133) is provided in the refrigerant circuit (20) with a configuration different from that of the first aspect. Specifically, in the first invention, the first bypass pipe (133) forms a bypass path from the inflow end of the first expansion mechanism (132) to the outflow end of the first cooling heat exchanger (131). On the other hand, the first bypass pipe (133) of the third invention constitutes a bypass path from the inflow end of the first expansion mechanism (132) to the outflow end of the first expansion mechanism (132). The technical feature of bypassing the first expansion mechanism (132) is the same for the bypass pipe (133) of any invention.

  Here, during normal operation of the refrigeration system, the flow control mechanism (SV-6, 137) of the first bypass pipe (133) is fully closed, while the first expansion mechanism (132) is opened to a predetermined opening. By doing so, the condensed refrigerant can be caused to flow into the first expansion mechanism (132). Therefore, in the same manner as in the first invention, the refrigerant is circulated through the first and second cooling heat exchangers (131, 141), and the cooling capacity of both the cooling heat exchangers (131, 141) is set to the respective cooling heat exchangers (131, 141). It can be adjusted by the expansion mechanism (132, 142) corresponding to.

  On the other hand, in this refrigeration system, when cooling in the warehouse by the first cooling heat exchanger (131) is not required, the flow rate adjusting mechanism (SV-6, 137) of the first bypass pipe (133) is opened, By making the first expansion mechanism (132) fully closed, the condensed refrigerant can be introduced into the first bypass pipe (133). For this reason, the refrigerant does not flow through the first expansion mechanism (132) and flows through the first cooling heat exchanger (131) without being decompressed. Therefore, in the first cooling heat exchanger (131), the refrigerant does not evaporate, and is cooled by exchanging heat with the internal air in a relatively low temperature state. That is, the refrigerant can be supercooled in the first cooling heat exchanger (131). The refrigerant that has flowed out of the first cooling heat exchanger (131) passes through the second expansion mechanism (142). At this time, the refrigerant pressure is adjusted to a predetermined pressure according to the opening degree of the second expansion mechanism (142). The refrigerant decompressed by the second expansion mechanism (142) flows through the second cooling heat exchanger (141). In the second cooling heat exchanger (141), the refrigerant absorbs heat from the internal air and evaporates. For this reason, the inside of the warehouse is cooled to a predetermined temperature by the second cooling heat exchanger (141).

  As described above, during operation in which the cooling of the first cooling heat exchanger (131) is not required, the refrigerant is introduced into the first bypass pipe (133), thereby circulating the first cooling heat exchanger (131). The refrigerant can be sent to the second cooling heat exchanger (141) without evaporating. Therefore, the inside of the warehouse can be cooled only by the second cooling heat exchanger (141), and the cooling capacity of the second cooling heat exchanger (141) can be adjusted by the second expansion mechanism (142). . At this time, since the refrigerant is supercooled in the first cooling heat exchanger (131), the cooling capacity of the second cooling heat exchanger (141) can be improved.

  According to a fourth aspect of the present invention, in the refrigeration apparatus according to any one of the first to third aspects, the refrigerant circuit (20) has one end connected to the inflow end of the second expansion mechanism (142) and the other end connected to the inflow end. A second bypass pipe (143) connected to the outflow end of the second cooling heat exchanger (141) and having a flow rate adjusting mechanism (SV-6, 137) is provided.

  In the fourth aspect, the second bypass pipe (143) similar to the first bypass pipe (133) described above is provided as a bypass path of the second cooling heat exchanger (141). For this reason, when cooling of the second cooling heat exchanger (141) is not required, the refrigerant is allowed to flow only through the first cooling heat exchanger (131), and the cooling capacity of the first cooling heat exchanger (131) is increased to the first expansion. It can be adjusted by the mechanism (132).

  According to a fifth aspect of the present invention, in the refrigeration apparatus according to any one of the first to fourth aspects, the flow rate control mechanism is configured by an openable / closable electromagnetic valve (SV-6).

  In the fifth aspect of the invention, the solenoid valve (SV-6) is provided as a flow rate adjusting mechanism of the first bypass pipe (133) or the second bypass pipe (143). Therefore, switching of the bypass operation in the bypass pipes (133, 143) can be easily performed by the opening / closing operation of the solenoid valve (SV-6).

  According to a sixth aspect of the present invention, in the refrigeration apparatus according to any one of the first to fourth aspects, the flow rate control mechanism is constituted by a motor valve (137) having a variable opening.

  In the sixth invention, the motor operated valve (137) is provided as a flow rate adjusting mechanism for the first bypass pipe (133) or the second bypass pipe (143). Therefore, the bypass operation in the bypass pipes (133, 143) can be switched by switching the motor-operated valve (137) between the fully closed state and the fully opened state.

  In addition, by adjusting the opening of the motor-operated valve (137) to a predetermined opening, the refrigerant flow is bypassed to the bypass pipe (133,143), and the refrigerant is circulated through the cooling heat exchanger (131,141) without bypassing the bypass pipe (133,143). It is also possible to adjust the distribution ratio with the flow rate of the refrigerant. Therefore, the cooling capacity of the cooling heat exchanger (131, 141) can be adjusted by adjusting the flow rate of the refrigerant flowing through each cooling heat exchanger (131, 141).

  According to a seventh invention, in the refrigeration apparatus of the first to sixth inventions, the compressor (41, 151) includes a main compressor (41) and a sub compressor (151), and the refrigerant circuit (20) A refrigeration circuit (110) having a refrigeration heat exchanger (111) for cooling the inside of the refrigerator, and first and second refrigeration heat exchangers (131,141) as first and second cooling heat exchangers for cooling different refrigerators, respectively. ) And the refrigerating circuit (30) having the sub compressor (151) are connected in parallel to the heat source side circuit (40) having the main compressor (41).

  In the seventh invention, the refrigeration circuit (110) on the higher stage side and the refrigeration circuit (30) on the lower stage side are connected in parallel to the heat source side circuit (40), so-called two-stage compression type. A refrigerant circuit (20) is formed. First and second cooling heat exchangers (first and second refrigeration heat exchangers) (131, 141) are connected in series to the refrigeration circuit (30) on the lower stage side. And the inside of a freezer is cooled by the 1st, 2nd freezing heat exchanger (131,141). Therefore, by switching the bypass operation of the bypass pipes (133, 143), the inside of the freezer can be cooled with only one freezing heat exchanger. Further, the cooling capacity of each refrigeration heat exchanger (131, 141) can be adjusted by the expansion mechanism (132, 142) corresponding to the refrigeration heat exchanger (131, 141).

  According to the first aspect of the invention, during the normal operation in which the interior is cooled by the first and second cooling heat exchangers (131, 141), the first cooling heat is not supplied to the refrigerant via the first bypass pipe (133). It can be distributed to both the exchanger (131) and the second cooling heat exchanger (141). Here, the refrigerant passes through the first expansion mechanism (132) before flowing into the first cooling heat exchanger (131). Therefore, the cooling capacity of the first cooling heat exchanger (131) can be adjusted by adjusting the opening of the first expansion mechanism (132) to a predetermined opening. Similarly, the refrigerant passes through the second expansion mechanism (142) before flowing into the second cooling heat exchanger (141). Therefore, the cooling capacity of the second cooling heat exchanger (141) can be adjusted by adjusting the opening degree of the second expansion mechanism (142).

  In addition, according to the present invention, when the inside of the warehouse is sufficiently cooled by the first cooling heat exchanger (131) and the inside of the warehouse is not required to be cooled by the first cooling heat exchanger (131), the refrigerant is removed. It can distribute | circulate only to a 2nd cooling heat exchanger (141) via 1 bypass pipe (133). Therefore, it is possible to avoid unnecessary cooling from being performed in the first cooling heat exchanger (131).

  By the way, when performing the above normal operation in the refrigerant circuit (20) in which the first cooling heat exchanger (131) and the second cooling heat exchanger (141) are connected in series, the second cooling heat exchange is performed. The cooling capacity of the first cooling heat exchanger (131) located on the upstream side of the vessel (141) tends to be higher. For this reason, the inside of the store | warehouse | chamber in which the 1st cooling heat exchanger (131) is provided is cooled more easily than the inside in the store | warehouse | chamber in which the 2nd cooling heat exchanger (141) is provided. While the cooling capacity of the cooling heat exchanger (131) becomes excessive, it is likely to cause a situation where the cooling capacity of the second cooling heat exchanger (141) is insufficient.

  On the other hand, according to the present invention, the cooling of the interior by the first cooling heat exchanger (131) is stopped by the bypass operation of the first bypass pipe (133), while only the second cooling heat exchanger (141) is used for storage. Since the inside can be cooled, a plurality of interiors can be efficiently cooled.

  Furthermore, according to the present invention, during the bypass operation in the first bypass pipe (133), the refrigerant passes through the second expansion mechanism (142) before flowing into the second cooling heat exchanger (141). To do. Therefore, the cooling capacity of the second cooling heat exchanger (141) can be adjusted by adjusting the opening degree of the second expansion mechanism (142).

  According to the second aspect, the heat transfer section (133a) of the first bypass pipe (133) is brought into contact with the heat transfer pipe of the first cooling heat exchanger (131). For this reason, when introducing the refrigerant into the first bypass pipe (133), the heat of the refrigerant flowing through the first bypass pipe (133) is conducted to the first cooling heat exchanger (131), and the refrigerant is subcooled. It can be carried out. Therefore, when cooling in a store | warehouse | chamber only with a 2nd cooling heat exchanger (141), the improvement of the cooling capacity of a 2nd cooling heat exchanger (141) can be aimed at.

  In particular, when the normal operation is performed in the refrigerant circuit (20) in which the first cooling heat exchanger (131) and the second cooling heat exchanger (141) are connected in series, the second cooling heat exchange is performed as described above. Although the refrigerating capacity of the cooler (141) tends to be insufficient, according to the present invention, the shortage of refrigerating capacity of the second cooling heat exchanger (141) can be quickly resolved by the supercooling of the refrigerant.

  For example, when moisture in the air adheres to the first refrigeration heat exchanger (131) and frost is formed, the first refrigeration is performed using the heat of the refrigerant flowing through the first bypass pipe (133). It is also possible to defrost the heat exchanger (131).

  According to the third aspect of the present invention, in the normal operation in which the interior is cooled by the first and second cooling heat exchangers (131, 141), the refrigerant is not cooled via the first bypass pipe (133) and the both cooling heat exchangers are used. (131,141). The refrigerating capacity of the first and second cooling heat exchangers (131, 141) can be adjusted by the expansion mechanisms (132, 142) corresponding to the respective cooling heat exchangers (131, 141).

  In addition, according to the present invention, when the internal cooling by the first cooling heat exchanger (131) is unnecessary, the refrigerant is introduced into the first bypass pipe (133), whereby the first expansion mechanism (132). Can be circulated through the first refrigeration heat exchanger (131) without reducing the pressure. Therefore, the first refrigeration heat exchanger (131) does not cool the inside of the cabinet, and the inside of the cabinet can be cooled only by the second cooling heat exchanger (141). Therefore, it is possible to avoid unnecessary cooling from being performed in the first cooling heat exchanger (131). At this time, since the refrigerant passes through the second expansion mechanism (142) before flowing into the second cooling heat exchanger (141), the opening degree of the second expansion mechanism (142) is adjusted and the second cooling heat is adjusted. The cooling capacity of the exchanger (141) can be adjusted.

  Further, according to the present invention, the refrigerant introduced into the first bypass pipe (133) is circulated to the first refrigeration heat exchanger (131) when the inside of the warehouse by the first cooling heat exchanger (131) is not required to be cooled. Thus, the refrigerant can be supercooled in the first refrigeration heat exchanger (131). Therefore, the cooling capacity of the second cooling heat exchanger (141) can be improved.

  In particular, when the normal operation is performed in the refrigerant circuit (20) in which the first cooling heat exchanger (131) and the second cooling heat exchanger (141) are connected in series, the second cooling heat exchange is performed as described above. Although the refrigerating capacity of the cooler (141) tends to be insufficient, according to the present invention, the shortage of refrigerating capacity of the second cooling heat exchanger (141) can be quickly resolved by the supercooling of the refrigerant.

  Further, since the heat transfer tube of the first refrigeration heat exchanger (131) can be heated from the inside by the refrigerant flowing through the first refrigeration heat exchanger (131), the defrosting of the first refrigeration heat exchanger (131) is effective. Can be done automatically.

  According to the fourth aspect of the invention, the second bypass pipe (143) is provided as a bypass path of the second cooling heat exchanger (141). Therefore, for example, when the second cooling heat exchanger (141) is thermo-off, the refrigerant is allowed to flow only to the first cooling heat exchanger (131) when the second cooling heat exchanger (141) does not need to cool the inside of the cabinet. The inside of the cabinet can be cooled only by the first cooling heat exchanger (131). At this time, the cooling capacity of the first cooling heat exchanger (131) can be adjusted by the first expansion mechanism (132).

  According to the fifth aspect of the invention, the solenoid valve (SV-6) is used as the flow rate adjusting mechanism of the bypass pipe (133, 143). Therefore, the bypass operation in the bypass pipes (133, 143) can be switched with a simple structure.

  According to the sixth aspect of the invention, the motor operated valve (137) is used as the flow rate adjusting mechanism of the bypass pipe (133, 143). Therefore, by adjusting the opening degree of the motor-operated valve (137) to a predetermined opening degree, the refrigerant flow rate bypassed to the bypass pipe (133,143) and the bypass pipe (133,143) are bypassed to the cooling heat exchanger (131,141). The distribution ratio with the flow rate of the refrigerant to be adjusted can be adjusted. Therefore, the cooling capacity of the first cooling heat exchanger (131) and the second cooling heat exchanger (141) can be adjusted by adjusting the opening degree of the electric valve (137).

  According to the seventh aspect, in the so-called two-stage compression refrigerant circuit (20), the first and second refrigerations as the first and second cooling heat exchangers are added to the refrigeration circuit (30) on the lower stage side. The heat exchangers (131, 141) are provided in series, and the first to sixth inventions are applied. Therefore, in this refrigeration apparatus, the inside of the freezer can be cooled only by the necessary refrigeration heat exchangers (131, 141), and the cooling capacity of each refrigeration heat exchanger (131, 141) can be individually adjusted.

  Hereinafter, embodiments of the present invention will be described in detail with reference to the drawings.

  The refrigeration apparatus (10) of this embodiment is installed in a convenience store or the like, and performs air conditioning in the store and cooling in the showcase.

  As shown in FIG. 1, the refrigeration apparatus (10) of this embodiment includes an outdoor unit (11), an air conditioning unit (12), a refrigerated showcase (13) as a refrigerator, and first and first refrigerators. 2 refrigeration showcases (15a, 15b) and a booster unit (16). The outdoor unit (11) is installed outdoors. On the other hand, the remaining air conditioning units (12) and the like are all installed in a store such as a convenience store.

  The outdoor unit (11) has an outdoor circuit (40), the air conditioning unit (12) has an air conditioning circuit (100), the refrigerated showcase (13) has a refrigerator internal circuit (110), and a first freezing showcase ( 15a) includes a first freezer circuit (130a), a second freezer showcase (15b) includes a second freezer circuit (130b), and a booster unit (16) includes a booster circuit (150). ing. In the refrigeration apparatus (10), the refrigerant circuit (20) is configured by connecting these circuits (40, 100,...) With pipes.

  The first freezer circuit (130a) and the second freezer circuit (130b) are connected in series with each other, and the second freezer circuit (130b) and the booster circuit (150) are connected in series with each other. ing. And the 1st freezer circuit (130a), the 2nd freezer circuit (130b), and the booster circuit (150) comprise the freezer circuit (30). In this refrigeration circuit (30), a liquid side closing valve (31) is provided at the end of the first freezer circuit (130a), and a gas side closing valve (32) is provided at the end of the booster circuit (150). It has been. On the other hand, the refrigerator internal circuit (110) alone constitutes a refrigeration circuit. The outdoor circuit (40) alone constitutes a heat source side circuit.

  In the refrigerant circuit (20), the refrigerator internal circuit (110) and the refrigeration circuit (30) are connected in parallel to the outdoor circuit (40). Specifically, the refrigerator internal circuit (110) and the refrigeration circuit (30) are connected to the outdoor circuit (40) via the first liquid side communication pipe (21) and the first gas side communication pipe (22). Yes. One end of the first liquid side connecting pipe (21) is connected to the outdoor circuit (40). The other end of the first liquid side connecting pipe (21) is branched into two, one of the branches is connected to the liquid side end of the refrigerator internal circuit (110), and the other is connected to the liquid side closing valve (31). It is connected. One end of the first gas side communication pipe (22) is connected to the outdoor circuit (40). The other end of the first gas side communication pipe (22) is branched into two, one of which is connected to the gas side end of the refrigerator internal circuit (110) and the other is connected to the gas side shut-off valve (32). It is connected.

  In the refrigerant circuit (20), the air conditioning circuit (100) is connected to the outdoor circuit (40) via the second liquid side communication pipe (23) and the second gas side communication pipe (24). The second liquid side connecting pipe (23) has one end connected to the outdoor circuit (40) and the other end connected to the liquid side end of the air conditioning circuit (100). The second gas side connecting pipe (24) has one end connected to the outdoor circuit (40) and the other end connected to the gas side end of the air conditioning circuit (100).

《Outdoor unit》
As described above, the outdoor unit (11) includes the outdoor circuit (40). The outdoor circuit (40) includes a variable capacity compressor (41), a fixed capacity compressor (42), an outdoor heat exchanger (43), a receiver (44), and an outdoor expansion valve (45). . The outdoor circuit (40) is provided with two four-way switching valves (51, 52), two liquid side closing valves (53, 55), and two gas side closing valves (54, 56). . In this outdoor circuit (40), the first liquid side closing pipe (21) is connected to the first liquid side closing valve (53), and the first gas side connecting pipe (22) is connected to the first gas side closing valve (54). However, the second liquid side closing valve (55) is connected to the second liquid side connecting pipe (23), and the second gas side closing valve (56) is connected to the second gas side connecting pipe (24). .

  The variable capacity compressor (41) and the fixed capacity compressor (42) are all hermetic and high pressure dome type scroll compressors. Electric power is supplied to the variable capacity compressor (41) via an inverter. The capacity of the variable capacity compressor (41) can be changed by changing the rotation speed of the compressor motor by changing the output frequency of the inverter. The variable capacity compressor (41) constitutes a main compressor. On the other hand, in the fixed capacity compressor (42), the compressor motor is always operated at a constant rotational speed, and the capacity cannot be changed.

  One end of a first suction pipe (61) is connected to the suction side of the variable capacity compressor (41). The other end of the first suction pipe (61) is connected to the first gas side closing valve (54). On the other hand, one end of the second suction pipe (62) is connected to the suction side of the fixed capacity compressor (42). The other end of the second suction pipe (62) is connected to the second four-way switching valve (52). One end of the suction connection pipe (63) is connected to the first suction pipe (61), and the other end of the suction connection pipe (63) is connected to the second suction pipe (62). The suction connection pipe (63) is provided with a check valve (CV-1) that allows only the refrigerant to flow from one end to the other end.

  A discharge pipe (64) is connected to the variable capacity compressor (41) and the fixed capacity compressor (42). One end of the discharge pipe (64) is connected to the first four-way switching valve (51). The discharge pipe (64) is branched at the other end into a first branch discharge pipe (64a) and a second branch discharge pipe (64b). The first branch discharge pipe (64a) is connected to the discharge side of the variable capacity compressor (41), and the second branch discharge pipe (64b) is connected to the discharge side of the fixed capacity compressor (42). The second branch discharge pipe (64b) is provided with a check valve (CV-3) that allows only the refrigerant flow from the fixed capacity compressor (42) to the first four-way switching valve (51). . Further, one end of a discharge connection pipe (65) is connected to the discharge pipe (64). The other end of the discharge connection pipe (65) is connected to the second four-way switching valve (52).

  The outdoor heat exchanger (43) is a cross-fin type fin-and-tube heat exchanger and constitutes a heat source side heat exchanger. In the outdoor heat exchanger (43), heat is exchanged between the refrigerant and the outdoor air. One end of the outdoor heat exchanger (43) is connected to the first four-way switching valve (51) via the closing valve (57). On the other hand, the other end of the outdoor heat exchanger (43) is connected to the top of the receiver (44) via the first liquid pipe (81). The first liquid pipe (81) is provided with a check valve (CV-4) that allows only the refrigerant to flow from the outdoor heat exchanger (43) to the receiver (44).

  One end of a second liquid pipe (82) is connected to the bottom of the receiver (44) via a closing valve (58). The second liquid pipe (82) is branched into a first branch pipe (82a) and a second branch pipe (82b) on the other end side. The first branch pipe (82a) of the second liquid pipe (82) is connected to the first liquid side shut-off valve (53), and the second branch pipe (82b) is connected to the second liquid side shut-off valve (55). It is connected. The second branch pipe (82b) of the second liquid pipe (82) has a check valve (CV-5) that allows only the refrigerant to flow from the receiver (44) to the second liquid side shut-off valve (55). Is provided.

  In the second branch pipe (82b) of the second liquid pipe (82), one end of the third liquid pipe (83) is interposed between the check valve (CV-5) and the second liquid side stop valve (55). Is connected. The other end of the third liquid pipe (83) is connected to the top of the receiver (44). The third liquid pipe (83) is provided with a check valve (CV-6) that allows only the refrigerant to flow from one end to the other end.

  One end of the fourth liquid pipe (84) is connected downstream of the closing valve (58) in the second liquid pipe (82). The other end of the fourth liquid pipe (84) is connected between the outdoor heat exchanger (43) and the check valve (CV-4) in the first liquid pipe (81). The fourth liquid pipe (84) is provided with an outdoor expansion valve (45).

  The first four-way switching valve (51) has a first port to the discharge pipe (64), a second port to the second four-way switching valve (52), and a third port to the outdoor heat exchanger (43 ), The fourth port is connected to the second gas side shut-off valve (56), respectively. The first four-way selector valve (51) is in a first state (state indicated by a solid line in FIG. 1) in which the first port and the third port communicate with each other and the second port and the fourth port communicate with each other. ) And a second state (state indicated by a broken line in FIG. 1) in which the first port and the fourth port communicate with each other and the second port and the third port communicate with each other.

  The second four-way switching valve (52) has a first port to the discharge connection pipe (65), a second port to the second suction pipe (62), and a fourth port to the first four-way switching valve ( 51) is connected to the second port. The second four-way switching valve (52) has a third port sealed. Therefore, the second four-way switching valve is substantially used as a three-way valve. The second four-way selector valve (52) is in a first state (state indicated by a solid line in FIG. 1) in which the first port and the third port communicate with each other and the second port and the fourth port communicate with each other. ) And a second state (state indicated by a broken line in FIG. 1) in which the first port and the fourth port communicate with each other and the second port and the third port communicate with each other.

  The outdoor circuit (40) is also provided with an oil separator (70), an oil return pipe (71), an injection pipe (85), and a communication pipe (87). Furthermore, the outdoor circuit (40) is provided with two oil equalizing pipes (72, 73) and two suction side pipes (66, 67).

  The oil separator (70) is provided in the discharge pipe (64). The oil separator (70) is for separating the refrigerating machine oil from the discharge gas of the compressor (41, 42). One end of an oil return pipe (71) is connected to the oil separator (70). The other end of the oil return pipe (71) is connected to the first suction pipe (61). The oil return pipe (71) is provided with a solenoid valve (SV-5). When the solenoid valve (SV-5) is opened, the refrigeration oil separated by the oil separator (70) is sent back to the suction side of the variable capacity compressor (41).

  The first oil equalizing pipe (72) has one end connected to the variable capacity compressor (41) and the other end connected to the second suction pipe (62). The first oil equalizing pipe (72) is provided with a solenoid valve (SV-1). On the other hand, the second oil equalizing pipe (73) has one end connected to the fixed capacity compressor (42) and the other end connected to the first suction pipe (61). The second oil equalizing pipe (73) is provided with a solenoid valve (SV-2). By appropriately opening and closing these solenoid valves (SV-1, SV-2), the amount of refrigerating machine oil stored in each compressor (41, 42) is averaged.

  The first suction pipe (66) has one end connected to the second suction pipe (62) and the other end connected to the first suction pipe (61). The first suction side pipe (66) is provided with a solenoid valve (SV-3) and a check valve (CV-2) in order from one end to the other end. This check valve (CV-2) only allows the refrigerant to flow from one end to the other end of the first suction side pipe (66). On the other hand, the second suction side pipe (67) is connected so as to connect both sides of the solenoid valve (SV-3) in the first suction side pipe (66). The second suction side pipe (67) is provided with a solenoid valve (SV-4).

  The injection pipe (85) is for performing so-called liquid injection. One end of the injection pipe (85) is connected to the fourth liquid pipe (84) via the closing valve (59), and the other end is connected to the first suction pipe (61). The injection pipe (85) is provided with a variable flow rate control valve (86). One end of a communication pipe (87) is connected between the closing valve (59) and the flow control valve (86) in the injection pipe (85). The other end of the communication pipe (87) is connected between the oil separator (70) and the solenoid valve (SV-5) in the oil return pipe (71). The communication pipe (87) is provided with a check valve (CV-7) that allows only the refrigerant to flow from one end to the other end.

  Various sensors and pressure switches are also provided in the outdoor circuit (40). Specifically, the first suction pipe (61) is provided with a first suction temperature sensor (91) and a first suction pressure sensor (93). The second suction pipe (62) is provided with a second suction temperature sensor (92) and a second suction pressure sensor (94). The discharge pipe (64) is provided with a discharge temperature sensor (96) and a discharge pressure sensor (97). One high pressure switch (95) is provided in each of the first and second discharge branch pipes (64a, 64b).

  The outdoor unit (11) is provided with an outdoor air temperature sensor (90) and an outdoor fan (48). Outdoor air is sent to the outdoor heat exchanger (43) by the outdoor fan (48).

《Air conditioning unit》
As described above, the air conditioning unit (12) includes the air conditioning circuit (100). In the air conditioning circuit (100), an air conditioning expansion valve (102) and an air conditioning heat exchanger (101) are provided in that order from the liquid side end to the gas side end. The air conditioning heat exchanger (101) is constituted by a cross fin type fin-and-tube heat exchanger. In the air conditioning heat exchanger (101), heat is exchanged between the refrigerant and the room air. On the other hand, the air conditioning expansion valve (102) is an electronic expansion valve.

  The air conditioning unit (12) is provided with a heat exchanger temperature sensor (103) and a refrigerant temperature sensor (104). The heat exchanger temperature sensor (103) is attached to the heat transfer tube of the air conditioning heat exchanger (101). The refrigerant temperature sensor (104) is attached in the vicinity of the gas side end of the air conditioning circuit (100). The air conditioning unit (12) is provided with an internal air temperature sensor (106) and an air conditioning fan (105). The indoor air in the store is sent to the air conditioning heat exchanger (101) by the air conditioning fan (105).

Refrigerated showcase
As described above, the refrigerated showcase (13) includes the refrigerator internal circuit (110). In the refrigerator internal circuit (110), a refrigeration expansion valve (112) and a refrigeration heat exchanger (111) are provided in order from the liquid side end to the gas side end. The refrigeration heat exchanger (111) is a cross-fin type fin-and-tube heat exchanger, and constitutes a first heat exchanger. In the refrigeration heat exchanger (111), heat is exchanged between the refrigerant and the internal air. On the other hand, the refrigeration expansion valve (112) is an electronic expansion valve.

  The refrigerated showcase (13) is provided with a heat exchanger temperature sensor (113) and a refrigerant temperature sensor (114). The heat exchanger temperature sensor (113) is attached to the heat transfer tube of the refrigeration heat exchanger (111). The refrigerant temperature sensor (114) is attached in the vicinity of the gas side end in the refrigerator internal circuit (110). The refrigerated showcase (13) is provided with a refrigerator temperature sensor (116) and a refrigerator fan (115). To the refrigerated heat exchanger (111), the air in the refrigerator of the refrigerated showcase (13) is sent by the fan (115) in the refrigerator.

《Frozen Showcase》
The frozen showcase is composed of first and second frozen showcases (15a, 15b). The first freezer showcase (15a) includes the first freezer circuit (130a), while the second freezer showcase (15b) includes the second freezer circuit (130b).

  In the first freezer circuit (130a), the first refrigeration expansion valve (first expansion mechanism) (132), the first refrigeration heat exchanger (131), and the refrigerant in that order from the liquid side end to the gas side end. A temperature sensor (134) and a check valve (CV-8) are provided. The first refrigeration heat exchanger (131) is a cross-fin type fin-and-tube heat exchanger, and constitutes a first cooling heat exchanger. In the first refrigeration heat exchanger (131), heat is exchanged between the refrigerant and the internal air. On the other hand, the first refrigeration expansion valve (132) is an electronic expansion valve. The first refrigeration expansion valve (132) adjusts the refrigerant pressure flowing into the first refrigeration heat exchanger (131). The first freezer showcase (15b) is provided with a first freezer temperature sensor (136) and a first freezer fan (135). The air in the first freezer showcase (15a) is sent to the first freezing heat exchanger (131) by the first freezer fan (135).

  In the second freezer circuit (130b), in order from the liquid side end to the gas side end, the second refrigeration expansion valve (second expansion mechanism) (142), the second refrigeration heat exchanger (141), and the refrigerant A temperature sensor (144) is provided. The second refrigeration heat exchanger (141) is a cross-fin type fin-and-tube heat exchanger, and constitutes a second cooling heat exchanger. In the second refrigeration heat exchanger (141), heat exchange is performed between the refrigerant and the internal air. On the other hand, the second refrigeration expansion valve (142) is an electronic expansion valve. The second refrigeration expansion valve (142) adjusts the refrigerant pressure flowing into the second refrigeration heat exchanger (141). The second freezer showcase (15b) is provided with a second freezer temperature sensor (146) and a second freezer fan (145). The air in the second freezer showcase (15b) is sent to the second freezing heat exchanger (141) by the second freezer fan (145).

  Further, in the first freezer circuit (130a) described above, a first bypass pipe (bypassing the refrigerant immediately before flowing into the first refrigeration expansion valve (132) to the downstream side of the first refrigeration heat exchanger (131)). 133). The first bypass pipe (133) has one end connected to the inflow end of the first refrigeration expansion valve (132) and the other end connected between the first refrigeration heat exchanger (131) and the second refrigeration expansion valve (142). Connected between. The first bypass pipe (133) includes a solenoid valve (SV-6) that can be freely opened and closed as a flow rate adjusting mechanism. The check valve (CV-8) permits only the refrigerant to flow from the outflow end of the first refrigeration heat exchanger (131) to the other end of the first bypass pipe (133).

《Booster unit》
As described above, the booster unit (16) includes the booster circuit (150). The booster circuit (150) is provided with a booster compressor (151).

  The booster compressor (151) is a hermetic type high-pressure dome type scroll compressor. Electric power is supplied to the booster compressor (151) via an inverter. The capacity of the booster compressor (151) can be changed by changing the rotational speed of the compressor motor by changing the output frequency of the inverter. The booster compressor (151) constitutes a sub compressor.

  The booster compressor (151) has a suction pipe (154) connected to the suction side and one end of the discharge pipe (155) connected to the discharge side. The other end of the suction pipe (154) is connected to the gas side end of the second freezer circuit (130b). On the other hand, the other end of the discharge pipe (155) is connected to the gas-side stop valve (32). The discharge pipe (155) is provided with a discharge temperature sensor (152) and a high pressure switch (153).

<Controller configuration>
The refrigeration apparatus (10) of the present embodiment includes a controller (200). The controller (200) performs control operations such as each four-way switching valve and each electromagnetic valve according to operating conditions.

-Driving action-
Hereinafter, main operations among the operation operations performed by the refrigeration apparatus (10) of the present embodiment will be described with reference to the drawings.

《Cooling operation》
In the cooling operation, the internal air is cooled in the refrigerated showcase (13), the first refrigerated showcase (15a), and the second refrigerated showcase (15b), and the indoor air is cooled in the air conditioning unit (12). This is an operation to cool the inside of the store.

  As shown in FIG. 2, in the outdoor circuit (40), the first four-way switching valve (51) and the second four-way switching valve (52) are set to the first state, and the outdoor expansion valve (45) is fully closed. Is done. Moreover, the opening degree of an air-conditioning expansion valve (102) and a refrigeration expansion valve (112) is adjusted suitably. Further, in the freezer internal circuit (130a, 130b), the solenoid valve (SV-6) is closed, and at the same time, the opening degree of the first refrigeration expansion valve (132) and the second refrigeration expansion valve (142) is appropriately adjusted. Is done. In this state, the variable capacity compressor (41), the fixed capacity compressor (42), and the booster compressor (151) are operated.

  The refrigerant discharged from the variable capacity compressor (41) and the fixed capacity compressor (42) is sent from the discharge pipe (64) to the outdoor heat exchanger (43) through the first four-way switching valve (51). . In the outdoor heat exchanger (43), the refrigerant dissipates heat to the outdoor air and condenses. The refrigerant condensed in the outdoor heat exchanger (43) passes through the receiver (44), flows into the second liquid pipe (82), and is distributed to each branch pipe (82a, 82b) of the second liquid pipe (82). Is done.

  The refrigerant flowing into the first branch pipe (82a) of the second liquid pipe (82) is distributed to the refrigerator internal circuit (110) and the first freezer internal circuit (130a) through the first liquid side connecting pipe (21). The

  The refrigerant flowing into the refrigerator internal circuit (110) is decompressed when passing through the refrigeration expansion valve (112) and then introduced into the refrigeration heat exchanger (111). In the refrigeration heat exchanger (111), the refrigerant absorbs heat from the internal air and evaporates. The refrigerant evaporated in the refrigeration heat exchanger (111) flows into the first gas side communication pipe (22). In the refrigerated showcase (13), the in-compartment air cooled by the refrigerated heat exchanger (111) is supplied into the interior.

  The refrigerant flowing into the first freezer circuit (130a) is reduced to a predetermined pressure when passing through the first freezing expansion valve (132) and then introduced into the first freezing heat exchanger (131). In the first refrigeration heat exchanger (131), the refrigerant absorbs heat from the internal air and evaporates. In the first refrigeration showcase (15a), the in-compartment air cooled by the first refrigeration heat exchanger (131) is supplied into the interior.

  The refrigerant evaporated in the first freezing heat exchanger (131) flows into the second freezer circuit (130b). This refrigerant is reduced to a predetermined pressure when passing through the second refrigeration expansion valve (142) and then introduced into the second refrigeration heat exchanger (141). In the second refrigeration heat exchanger (141), the refrigerant absorbs heat from the internal air and evaporates. In the second refrigeration showcase (15b), the in-compartment air cooled by the second refrigeration heat exchanger (141) is supplied into the interior.

  The refrigerant having cooled both the first refrigeration showcase (15a) and the second refrigeration showcase (15b) as described above flows into the booster circuit (150) and is sucked into the booster compressor (151). . The refrigerant compressed by the booster compressor (151) flows into the first gas side communication pipe (22) through the discharge pipe (155).

  In the first gas side communication pipe (22), the refrigerant sent from the refrigerator internal circuit (110) and the refrigerant sent from the booster circuit (150) merge. These refrigerants then flow from the first gas side connecting pipe (22) into the first suction pipe (61) and are sucked into the variable capacity compressor (41). The variable capacity compressor (41) compresses the sucked refrigerant and discharges it to the first branch discharge pipe (64a) of the discharge pipe (64).

  On the other hand, the refrigerant flowing into the second branch pipe (82b) of the second liquid pipe (82) is supplied to the air conditioning circuit (100) through the second liquid side connecting pipe (23). The refrigerant flowing into the air conditioning circuit (100) is reduced in pressure when passing through the air conditioning expansion valve (102) and then introduced into the air conditioning heat exchanger (101). In the air conditioning heat exchanger (101), the refrigerant absorbs heat from the room air and evaporates. In the air conditioning unit (12), the indoor air cooled by the air conditioning heat exchanger (101) is supplied into the store. The refrigerant evaporated in the air-conditioning heat exchanger (101) flows into the outdoor circuit (40) through the second gas side communication pipe (24), and the first four-way switching valve (51) and the second four-way switching valve. After passing through (52) in order, it is sucked into the fixed capacity compressor (42) through the second suction pipe (62). The fixed capacity compressor (42) compresses the sucked refrigerant and discharges it to the second branch discharge pipe (64b) of the discharge pipe (64).

《First heating operation》
In the first heating operation, the air in the refrigerator is cooled in the refrigerated showcase (13), the first refrigerated showcase (15a), and the second refrigerated showcase (15b), and the indoor air is heated by the air conditioning unit (12). This is an operation to heat the inside of the store.

  As shown in FIG. 3, in the outdoor circuit (40), the first four-way selector valve (51) is set to the second state, the second four-way selector valve (52) is set to the first state, and the outdoor expansion is performed. The valve (45) is fully closed. Moreover, the opening degree of an air-conditioning expansion valve (102) and a refrigeration expansion valve (112) is adjusted suitably. Further, in the freezer internal circuit (130a, 130b), the solenoid valve (SV-6) is closed, and at the same time, the opening degree of the first refrigeration expansion valve (132) and the second refrigeration expansion valve (142) is appropriately adjusted. Is done. In this state, the variable capacity compressor (41) and the booster compressor (151) are operated, and the fixed capacity compressor (42) is stopped. Further, the outdoor heat exchanger (43) enters a dormant state without the refrigerant being sent.

  The refrigerant discharged from the variable capacity compressor (41) is introduced into the air conditioning heat exchanger (101) of the air conditioning circuit (100) through the second gas side communication pipe (24), and dissipates heat to the outdoor air to condense. To do. In the air conditioning unit (12), room air heated by the air conditioning heat exchanger (101) is supplied into the store. The refrigerant condensed in the air conditioning heat exchanger (101) is sent back to the outdoor circuit (40) through the second liquid side connection pipe (23), passes through the receiver (44), and goes to the second liquid pipe (82). Inflow.

  The refrigerant flowing into the second liquid pipe (82) is distributed to the refrigerator internal circuit (110) and the first freezer internal circuit (130a) through the first liquid side connecting pipe (21). In the refrigerated showcase (13) and the first and second refrigerated showcases (15a, 15b), the internal air is cooled as in the cooling operation. The refrigerant evaporated in the refrigeration heat exchanger (111) flows into the first suction pipe (61) through the first gas side communication pipe (22). On the other hand, the refrigerant evaporated in the first refrigeration heat exchanger (131) and the second refrigeration heat exchanger (141) is compressed by the booster compressor (151) and then passes through the first gas side communication pipe (22). It flows into the first suction pipe (61). The refrigerant that has flowed into the first suction pipe (61) is sucked into the variable capacity compressor (41) and compressed.

  Thus, in the first heating operation, the refrigerant absorbs heat in the refrigeration heat exchanger (111) and the first and second refrigeration heat exchangers (131, 141), and the refrigerant dissipates heat in the air conditioning heat exchanger (101). And the inside of a store is heated using the heat which the refrigerant | coolant absorbed from the air in a store | warehouse | chamber with the refrigeration heat exchanger (111) and the 1st, 2nd freezing heat exchanger (131,141).

  In the first heating operation, the fixed capacity compressor (42) may be operated. Whether to operate the fixed capacity compressor (42) is determined according to the cooling load in the refrigerated showcase (13) and the first and second refrigerated showcases (15a, 15b). In this case, a part of the refrigerant flowing into the first suction pipe (61) is sucked into the fixed capacity compressor (42) through the suction connection pipe (63) and the second suction pipe (62).

《Second heating operation》
The second heating operation is an operation for heating the inside of the store similarly to the first heating operation. The second heating operation is performed when the heating capacity is excessive in the first heating operation.

  As shown in FIG. 4, in the outdoor circuit (40), the first four-way switching valve (51) and the second four-way switching valve (52) are set to the second state, and the outdoor expansion valve (45) is fully opened. The Moreover, the opening degree of an air-conditioning expansion valve (102) and a refrigeration expansion valve (112) is adjusted suitably. Further, in the freezer internal circuit (130a, 130b), the solenoid valve (SV-6) is closed, and at the same time, the opening degree of the first refrigeration expansion valve (132) and the second refrigeration expansion valve (142) is appropriately adjusted. Is done. In this state, the variable capacity compressor (41) and the booster compressor (151) are operated, and the fixed capacity compressor (42) is stopped.

  Part of the refrigerant discharged from the variable capacity compressor (41) is introduced into the air conditioning heat exchanger (101) of the air conditioning circuit (100) through the second gas side connecting pipe (24), and the rest is discharged. It is introduced into the outdoor heat exchanger (43) through the connecting pipe (65). The refrigerant introduced into the air-conditioning heat exchanger (101) dissipates heat to the indoor air, condenses, and passes through the second liquid side connecting pipe (23) and the third liquid pipe (83) of the outdoor circuit (40). It flows into the receiver (44). The refrigerant introduced into the outdoor heat exchanger (43) dissipates heat to the outdoor air, condenses, and flows into the receiver (44) through the first liquid pipe (81).

  The refrigerant flowing out from the receiver (44) to the second liquid pipe (82) passes through the first liquid side connection pipe (21) and the refrigerator internal circuit (110) and the first freezer internal circuit as in the first heating operation. (130a). In the refrigerated showcase (13) and the first and second refrigerated showcases (15a, 15b), the internal air is cooled. The refrigerant evaporated in the refrigeration heat exchanger (111) flows into the first suction pipe (61) through the first gas side communication pipe (22). On the other hand, the refrigerant evaporated in the first refrigeration heat exchanger (131) and the second refrigeration heat exchanger (141) is compressed by the booster compressor (151) and then passes through the first gas side communication pipe (22). It flows into the first suction pipe (61). The refrigerant that has flowed into the first suction pipe (61) is sucked into the variable capacity compressor (41) and compressed.

  Thus, in the second heating operation, the refrigerant absorbs heat in the refrigeration heat exchanger (111) and the first and second refrigeration heat exchangers (131, 141), and the air conditioning heat exchanger (101) and the outdoor heat exchanger (43 ), The refrigerant dissipates heat. A part of the heat absorbed by the refrigerant from the indoor air in the refrigeration heat exchanger (111) and the first and second refrigeration heat exchangers (131, 141) is used for heating in the store, and the rest is used for outdoor air. Released.

  In the second heating operation, the fixed capacity compressor (42) may be operated. Whether to operate the fixed capacity compressor (42) is determined according to the cooling load in the refrigerated showcase (13) and the first and second refrigerated showcases (15a, 15b). In this case, a part of the refrigerant flowing into the first suction pipe (61) is sucked into the fixed capacity compressor (42) through the suction connection pipe (63) and the second suction pipe (62).

<< 3rd heating operation >>
The third heating operation is an operation for heating the inside of the store similarly to the first heating operation. The third heating operation is performed when the heating capability is insufficient in the first heating operation.

  As shown in FIG. 5, in the outdoor circuit (40), the first four-way selector valve (51) is set to the second state, and the second four-way selector valve (52) is set to the first state. Moreover, the opening degree of an outdoor expansion valve (45), an air-conditioning expansion valve (102), and a refrigeration expansion valve (112) is adjusted suitably. Further, in the freezer internal circuit (130a, 130b), the solenoid valve (SV-6) is closed, and at the same time, the opening degree of the first refrigeration expansion valve (132) and the second refrigeration expansion valve (142) is appropriately adjusted. Is done. In this state, the variable capacity compressor (41), the fixed capacity compressor (42), and the booster compressor (151) are operated.

  The refrigerant discharged from the variable capacity compressor (41) and the fixed capacity compressor (42) is introduced into the air conditioning heat exchanger (101) of the air conditioning circuit (100) through the second gas side communication pipe (24). , Radiates heat to the outdoor air and condenses. In the air conditioning unit (12), room air heated by the air conditioning heat exchanger (101) is supplied into the store. The refrigerant condensed in the air conditioning heat exchanger (101) flows into the receiver (44) through the second liquid side connecting pipe (23) and the third liquid pipe (83). A part of the refrigerant flowing from the receiver (44) into the second liquid pipe (82) flows into the first liquid side connecting pipe (21), and the rest flows into the fourth liquid pipe (84).

  The refrigerant flowing into the first liquid side communication pipe (21) is distributed to the refrigerator internal circuit (110) and the first freezer internal circuit (130a). In the refrigerated showcase (13) and the first and second refrigerated showcases (15a, 15b), the internal air is cooled as in the first heating operation. The refrigerant evaporated in the refrigeration heat exchanger (111) flows into the first suction pipe (61) through the first gas side communication pipe (22). On the other hand, the refrigerant evaporated in the first refrigeration heat exchanger (131) and the second refrigeration heat exchanger (141) is compressed by the booster compressor (151) and then passes through the first gas side communication pipe (22). It flows into the first suction pipe (61). The refrigerant that has flowed into the first suction pipe (61) is sucked into the variable capacity compressor (41) and compressed.

  On the other hand, the refrigerant flowing into the fourth liquid pipe (84) is depressurized when passing through the outdoor expansion valve (45), and then introduced into the outdoor heat exchanger (43) to absorb heat from the outdoor air and evaporate. The refrigerant evaporated in the outdoor heat exchanger (43) flows into the second suction pipe (62), is sucked into the fixed capacity compressor (42), and is compressed.

  Thus, in the second heating operation, the refrigerant absorbs heat in the refrigeration heat exchanger (111), the refrigeration heat exchanger (131), and the outdoor heat exchanger (43), and the refrigerant in the air conditioning heat exchanger (101). Dissipate heat. Then, using the heat that the refrigerant has absorbed from the indoor air in the refrigeration heat exchanger (111) and the refrigeration heat exchanger (131) and the heat that the refrigerant has absorbed from the outdoor air in the outdoor heat exchanger (43) The inside of the store is heated.

<Bypass operation>
As described above, in the normal cooling operation or heating operation in the refrigeration apparatus (10), the interior is cooled in both the first refrigeration showcase (15a) and the second refrigeration showcase (15b). Here, for example, when the inside temperature of the first refrigeration showcase (15a) is sufficiently cooled, useless cooling is performed in the first refrigeration heat exchanger (131). For this reason, in the refrigeration apparatus (10) of the present embodiment, the following bypass operation is performed. Here, the bypass operation during the cooling operation of the refrigeration apparatus (10) will be described as an example.

  As shown in FIG. 6, for example, when the internal temperature of the first freezer showcase (15a) becomes lower than a predetermined temperature, the electromagnetic valve (SV-6) of the first freezer internal circuit (130a) is opened. The first refrigeration expansion valve (131) is fully closed. For this reason, for example, during the cooling operation, the refrigerant distributed from the first liquid side connection pipe (21) to the first freezer circuit (130a) is transferred to the first refrigeration expansion valve (132) and the first refrigeration heat exchanger ( 131) is not distributed, but instead the first bypass pipe (133) is distributed. Therefore, in the first refrigeration heat exchanger (131), heat exchange between the refrigerant and the internal air is not performed.

  The refrigerant flowing through the first bypass pipe (133) is reduced to a predetermined pressure when passing through the second refrigeration expansion valve (134) and then introduced into the second refrigeration heat exchanger (142). In the second refrigeration heat exchanger (141), the refrigerant absorbs heat from the internal air and evaporates. In the second refrigeration showcase (15b), the in-compartment air cooled by the second refrigeration heat exchanger (141) is supplied into the interior.

  The refrigerant having cooled only the second refrigeration showcase (15b) as described above flows into the booster circuit (150) and is sucked into the booster compressor (151). The refrigerant compressed by the booster compressor (151) flows into the first gas side communication pipe (22) through the discharge pipe (155).

  On the other hand, when the supply of the refrigerant to the first refrigeration heat exchanger (131) is stopped by such a bypass operation, the interior of the first refrigeration showcase (15a) is not cooled. Therefore, after that, when the internal temperature of the first freezer showcase (15a) becomes equal to or higher than the predetermined temperature, the electromagnetic valve (SV-6) of the first internal freezer circuit (130a) is opened again and the first freezing expansion valve ( 132) is adjusted to a predetermined opening, and the bypass operation is completed. Then, the normal cooling operation as described above is resumed.

-Effect of the embodiment-
According to the embodiment, the following effects are exhibited.

  According to the above embodiment, the refrigerant bypasses the first bypass during normal operation in which the first and second refrigeration heat exchangers (131, 141) cool the interior of the first and second refrigeration showcases (15a, 15b). It is made to distribute | circulate through both a 1st freezing heat exchanger (131) and a 2nd freezing heat exchanger (141), without passing through a pipe | tube (133) (for example, refer FIG. 1). Here, since the refrigerant passes through the first refrigeration expansion valve (132) before flowing into the first refrigeration heat exchanger (131), the opening of the first expansion valve (131) is adjusted to a predetermined opening. Thus, the cooling capacity of the first refrigeration heat exchanger (131) can be adjusted. Similarly, since the refrigerant passes through the second refrigeration expansion valve (142) before flowing into the second refrigeration heat exchanger (141), the opening degree of the second refrigeration expansion valve (142) is adjusted to adjust the second refrigeration expansion valve (142). The cooling capacity of the refrigeration heat exchanger (141) can be adjusted.

  On the other hand, when the cooling capacity of the first refrigeration heat exchanger (131) is sufficient and the first refrigeration showcase (15a) is not required to be cooled by the first refrigeration heat exchanger (131), the refrigerant Is circulated only through the first bypass pipe (133) to the second refrigeration heat exchanger (141) (see FIG. 6). Therefore, useless cooling can be avoided in the first refrigeration heat exchanger (131). Here, during the bypass operation in the first bypass pipe (133), the refrigerant passes through the second refrigeration expansion valve (142) before flowing into the second refrigeration heat exchanger (141). Therefore, the cooling capacity of the second refrigeration heat exchanger (141) can be adjusted by adjusting the opening degree of the second refrigeration expansion valve (142).

<Modification 1 of Embodiment>
Next, the modification 1 of the said embodiment is demonstrated. The first modification is different from the above embodiment in the configuration of the second freezer circuit (130b). Only differences from the above embodiment will be described below.

  As shown in FIG. 7, in the second freezer circuit (130b) of this modification, the refrigerant immediately before flowing into the second refrigeration expansion valve (142) is placed downstream of the second refrigeration heat exchanger (141). A second bypass pipe (133) for bypassing is provided. The second bypass pipe (143) has one end connected to the inflow end of the second refrigeration expansion valve (142) and the other end connected to the outflow end of the second refrigeration heat exchanger (141). The second bypass pipe (143) is provided with an openable / closable solenoid valve (SV-7) as a flow rate adjusting mechanism. A check valve (CV-9) is provided between the second refrigeration heat exchanger (141) and the other end of the second bypass pipe (143). The check valve (CV-9) only allows the refrigerant to flow from the outflow end of the second refrigeration heat exchanger (141) toward the other end of the second bypass pipe (143).

  In the refrigeration apparatus (10) of the first modification, for example, when it is not necessary to cool the second refrigeration showcase (15b) by the second refrigeration heat exchanger (141), the solenoid valve (SV-7) is installed. On the other hand, the refrigerant is introduced into the second bypass pipe (143) by fully closing the second refrigeration expansion valve (142). Therefore, while the 2nd freezing heat exchanger (141) is stopped, the inside of the store | warehouse | chamber of a 1st freezing showcase (15a) can be performed with a 1st freezing heat exchanger (131).

  Also in this modified example 1, when the interior of the first freezer showcase (15a) is excessively cooled, by opening the solenoid valve (SV-6) of the first bypass pipe (133), The second refrigeration showcase (15b) can be cooled only by the second refrigeration heat exchanger (141). At this time, the refrigerating capacity of the second refrigeration heat exchanger (141) can be adjusted by adjusting the opening of the second refrigeration expansion valve (142) to a predetermined opening.

<Modification 2 of embodiment>
Next, Modification 2 of the above embodiment will be described. The second modification is different from the above embodiment in the configuration of the first bypass pipe (133). Only differences from the above embodiment will be described below.

  As shown in FIG. 8, the first bypass pipe (133) of this modified example is located in the first freezer showcase (15a) and is in contact with the heat transfer pipe of the first freezing heat exchanger (131). It has the heat-transfer part (133a) formed so that.

  Therefore, during the bypass operation of the refrigeration apparatus (10), the heat of the refrigerant flowing through the first bypass pipe (133) is conducted to the first refrigeration heat exchanger (131) through the heat transfer section (133a). That is, the inside air that is in a relatively low temperature state and the refrigerant flowing through the first bypass pipe (133) exchange heat through the first refrigeration heat exchanger (131) and the heat transfer section (133a), and the first The refrigerant flowing through the bypass pipe (133) is cooled. Therefore, in the second modification, the refrigerant can be supercooled in the first freezer circuit (130a). Therefore, the refrigerating capacity of the second refrigeration heat exchanger (141) can be improved.

  Further, for example, when the moisture in the air adheres to the first refrigeration heat exchanger (131) and freezes, and frost is formed, the first bypass pipe (133) is connected by performing the bypass operation as described above. It is also possible to warm the surface of the first refrigeration heat exchanger (131) with the flowing refrigerant and perform so-called defrosting.

<Modification 3 of embodiment>
Next, Modification 3 of the above embodiment will be described. This modified example 3 is different from the above embodiment and modified example 2 in the configuration of the first bypass pipe (133). Only differences from the above embodiment will be described below.

  As shown in FIG. 9, the first bypass pipe (133) of Modification 3 has one end connected to the inflow end of the first refrigeration expansion valve (132) and the other end connected to the first refrigeration expansion valve (132). It is connected between the first refrigeration heat exchanger (131). The first bypass pipe (133) is provided with a solenoid valve (SV-6) that can be opened and closed in the same manner as in the above embodiment.

  In the refrigeration apparatus (10) of Modification 3, for example, when a bypass operation is performed during cooling operation, the electromagnetic valve (SV-6) is opened as shown in FIG. (131) is fully closed. Therefore, the refrigerant flowing into the first freezer circuit (130a) does not pass through the first freezing expansion valve (131) but passes through the first bypass pipe (133), and the first freezing heat exchanger (131). Flow into. Since the refrigerant flowing through the first refrigeration heat exchanger (131) is not depressurized, it does not evaporate by the internal air and releases heat to the internal air that is in a relatively low temperature state. Therefore, also in the third modification, the refrigerant flowing through the first refrigeration heat exchanger (131) can be supercooled. Therefore, the refrigerating capacity of the second refrigeration heat exchanger (141) can be improved.

  Further, by flowing a non-depressurized refrigerant through the first refrigeration heat exchanger (131) by the bypass operation, the surface of the first refrigeration heat exchanger (131) can be heated to perform so-called defrosting.

<< Other Embodiments >>
The present invention may be configured as follows with respect to the above embodiment.

  In the above embodiment, the openable / closable solenoid valves (SV-6, SV-7) are provided as the flow rate adjusting mechanism of the first bypass pipe (133) or the second bypass pipe (143). However, for example, as shown in FIG. 11, an electric valve (137) having a variable opening may be provided in place of such a solenoid valve (here, SV-6). As described above, when the motor operated valve (137) is used as the flow rate adjusting mechanism, the refrigerant can be circulated through the first refrigeration heat exchanger (131) and the first bypass pipe (133) at a predetermined distribution ratio. Therefore, the refrigeration capacity of the first refrigeration heat exchanger (131) and the second refrigeration heat exchanger (141) can be adjusted according to the opening degree of the electric valve (137).

  Moreover, in the said embodiment, although the 1st and 2nd freezing heat exchanger (131,141) is provided in series with the refrigerant circuit (20), three or more freezing heat exchangers are provided in this refrigerant circuit (20). You may make it provide in series. In this case, by providing a plurality of expansion mechanisms and bypass pipes corresponding to each refrigeration heat exchanger in the refrigerant circuit (20), the inside of the warehouse can be cooled only with the necessary refrigeration heat exchanger, The cooling capacity of each refrigeration heat exchanger can be adjusted individually.

  As described above, the present invention is useful for a refrigeration apparatus in which a plurality of heat exchangers for cooling the inside of a refrigerator circuit are provided in series in a refrigerant circuit.

It is a schematic block diagram of the freezing apparatus which concerns on embodiment. It is a schematic block diagram of the freezing apparatus which shows the flow of the refrigerant | coolant during air_conditionaing | cooling operation. It is a schematic block diagram of the freezing apparatus which shows the flow of the refrigerant | coolant during 1st heating operation. It is a schematic block diagram of the freezing apparatus which shows the flow of the refrigerant | coolant during 2nd heating operation. It is a schematic block diagram of the freezing apparatus which shows the flow of the refrigerant | coolant during 3rd heating operation. It is a schematic block diagram of the freezing apparatus which shows the flow of the refrigerant | coolant at the time of bypass operation. It is a schematic block diagram of the freezing apparatus which concerns on the modification 1. It is a schematic block diagram of the freezing apparatus which concerns on the modification 2. It is a schematic block diagram of the freezing apparatus which concerns on the modification 3. FIG. 10 is a schematic configuration diagram of a refrigeration apparatus showing a refrigerant flow during a bypass operation of Modification 3. It is a schematic block diagram of the freezing apparatus which concerns on other embodiment. It is a schematic block diagram of the freezing apparatus which concerns on a prior art.

Explanation of symbols

(10) Refrigeration equipment (20) Refrigerant circuit (30) Refrigeration circuit (40) Outdoor circuit (heat source side circuit)
(41) Variable capacity compressor (main compressor)
(43) Outdoor heat exchanger (heat source side heat exchanger)
(110) Refrigerator circuit (111) Refrigeration heat exchanger (130a) First freezer circuit (130b) Second freezer circuit (131) First refrigeration heat exchanger (first cooling heat exchanger)
(132) First refrigeration expansion valve (first expansion mechanism)
(133) First bypass pipe
(137) Motorized valve (flow rate adjustment mechanism)
(141) Second refrigeration heat exchanger (second cooling heat exchanger)
(142) Second refrigeration expansion valve (second expansion mechanism)
(143) Second bypass pipe (151) Booster compressor (sub compressor)
(SV-6) Solenoid valve (flow rate adjustment mechanism)

Claims (7)

A refrigerant circuit (20) having first and second cooling heat exchangers (131, 141), a compressor (41, 151), and an expansion mechanism (132, 142) for cooling different interiors is provided, and the refrigerant circuit (20) Is a refrigeration apparatus in which the first and second cooling heat exchangers (131, 141) are connected in series,
The expansion mechanism (132, 142) includes a first expansion mechanism (132) for adjusting a refrigerant pressure flowing into the first cooling heat exchanger (131), and a refrigerant pressure flowing into the second cooling heat exchanger (141). And a second expansion mechanism (142) for adjusting
One end of the refrigerant circuit (20) is connected to the inflow end of the first expansion mechanism (132), and the other end is connected between the first cooling heat exchanger (131) and the second expansion mechanism (142). And a first bypass pipe (133) having a flow rate adjusting mechanism (SV-6, 137). The refrigeration apparatus according to claim 1,
The first bypass pipe (133) is a refrigeration apparatus having a heat transfer section (133a) formed so as to come into contact with the heat transfer pipe of the first cooling heat exchanger (131). A refrigerant circuit (20) having first and second cooling heat exchangers (131, 141), a compressor (41, 151), and an expansion mechanism (132, 142) for cooling different interiors is provided, and the refrigerant circuit (20) Is a refrigeration apparatus in which the first and second cooling heat exchangers (131, 141) are connected in series,
The expansion mechanism (132, 142) includes a first expansion mechanism (132) for adjusting a refrigerant pressure flowing into the first cooling heat exchanger (131), and a refrigerant pressure flowing into the second cooling heat exchanger (141). And a second expansion mechanism (142) for adjusting
One end of the refrigerant circuit (20) is connected to the inflow end of the first expansion mechanism (132), and the other end is connected between the first expansion mechanism (132) and the first cooling heat exchanger (131). And a first bypass pipe (133) having a flow rate adjusting mechanism (SV-6, 137). The refrigeration apparatus according to any one of claims 1 to 3,
One end of the refrigerant circuit (20) is connected to the inflow end of the second expansion mechanism (142), the other end is connected to the outflow end of the second cooling heat exchanger (141), and the flow rate adjustment mechanism (SV) -6,137) is provided with a second bypass pipe (143). The refrigeration apparatus according to any one of claims 1 to 4,
The flow control mechanism is a refrigeration system consisting of a solenoid valve (SV-6) that can be freely opened and closed. The refrigeration apparatus according to any one of claims 1 to 4,
The flow rate control mechanism is a refrigeration system composed of an electrically operated valve (137) with variable opening. The refrigeration apparatus according to any one of claims 1 to 6,
The compressor (41,151) is composed of a main compressor (41) and a sub compressor (151).
The refrigerant circuit (20) includes a refrigeration circuit (110) having a refrigeration heat exchanger (111) for cooling the inside of the refrigerator, and first and first refrigeration heat exchangers for respectively cooling different refrigerators. Two refrigeration heat exchangers (131, 141) and a refrigeration circuit (30) having the sub compressor (151) are connected in parallel to a heat source side circuit (40) having the main compressor (41). Refrigeration equipment.

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