WO2024205090A1 - Device and method for defrosting evaporator of refrigeration apparatus - Google Patents

Abstract

The present invention relates to a device for defrosting an evaporator of a refrigeration apparatus in which a compressor, a condenser, a liquid receiver, an expansion valve and an evaporator form a refrigeration cycle, the device comprising: a plate-type heat exchanger providing, in parallel, a fog refrigerant circulation passage circulating a fog-type refrigerant that rapidly expands by means of the expansion valve formed at a first liquid refrigerant discharge line connected to a first outlet through which a liquid refrigerant stored in the liquid receiver is discharged, and a liquid refrigerant circulation passage circulating the liquid refrigerant supplied by means of the pumping operation of a refrigerant pump provided at a second liquid refrigerant transfer line connected to a second outlet of the liquid receiver; and a four-way defrosting solenoid valve, which is provided between the compressor and the condenser so as to select either the condenser or the evaporator so that high-temperature and high-pressure gas discharged through an output line of the compressor can be supplied thereto as a high-temperature and high-pressure gaseous refrigerant.

Description

Evaporator defrosting device and defrosting method of refrigerating device

The present invention relates to an evaporator defrosting device and a defrosting method for a refrigerating device, and more specifically, to an evaporator defrosting device and a defrosting method for a refrigerating device configured to most efficiently remove frost attached to the evaporator of a refrigerating device installed in a room storing cooled and frozen/refrigerated food or goods, and in a freezer, refrigerator, showcase, etc.

In general, the refrigeration cycle of a refrigerator consists of a compression process, a condensation process, an expansion process, and an evaporation process. If we look at each process, in the compression process, the low-temperature and low-pressure refrigerant gas evaporated through the evaporator is converted into high-temperature and high-pressure refrigerant gas through a compressor so that it condenses well. In the condensation process, the high-temperature and high-pressure refrigerant gas is condensed and liquefied through heat exchange with a heat exchange medium such as air or water, thereby converting it into a high-temperature liquid refrigerant. In the expansion process, the high-temperature liquid refrigerant is rapidly expanded to become a refrigerant in a foggy state, which is then supplied to the evaporator. In the evaporation process, the refrigerant in a foggy state that is rapidly expanded by the expansion valve is converted into a low-temperature and low-pressure gaseous state through a heat exchange action that takes heat from the heat exchange medium around the evaporator. In this process, the surrounding temperature is rapidly lowered and the cold air is supplied to indoor spaces, freezer/refrigerator rooms, showcases, etc., thereby cooling indoor spaces or cooling and freezing/refrigerating/refrigerating food, etc.

However, in the process of causing the refrigerant in a foggy state to evaporate through a heat exchange action that takes away the heat of the heat exchange medium around the evaporator, the evaporator absorbs the surrounding heat and changes it into a low-temperature gaseous state, and as a result of the rapid temperature difference with the surrounding temperature, frost is generated, and when this frost grows, the freezing and refrigeration efficiency of the freezer and refrigerator drops sharply.

Therefore, if frost is formed on the evaporator while the refrigerator is operating, the heat exchange efficiency decreases. Therefore, by periodically removing the frost formed on the evaporator, the heat exchange efficiency of the evaporator is not reduced, enabling the refrigerator to be operated efficiently.

As a defrosting device for removing frost that forms on the evaporator during operation of a conventional refrigeration device, a spray defrosting device for removing frost by spraying water, an electric heater defrosting device for removing frost by installing an electric heater on the evaporator, and a hot gas defrosting device are used.

Among the above-mentioned conventional refrigerating device's evaporator defrosting devices that remove frost by spraying water, the spraying defrosting device has been pointed out as a problem in that it requires additional installation of piping facilities for spraying defrosting water, which makes the evaporator structure larger and increases the installation cost. In addition, the electric heater defrosting device has been pointed out as a problem in that it requires a lot of electric energy to heat the evaporator to a certain temperature that can melt the frost formed on the evaporator, and after removing the frost, it is difficult to expect normal freezing/refrigeration efficiency of the evaporator until the temperature of the evaporator is restored to the original low temperature state before removing the frost.

In addition, the hot gas defrosting device of the prior art, as shown in Fig. 8, is configured to connect the outlet line (210) of the compressor (200) provided in the middle of the refrigerant circulation line (100) configured as a closed circuit to the inlet line (310) of the condenser (300), so that the high temperature and high pressure gaseous refrigerant compressed and discharged from the compressor (200) is introduced into the condenser (300), and the liquid refrigerant that is introduced into the condenser (300) and condensed and liquefied through heat exchange with an external heat exchange medium is discharged through the outlet line (320) and is stored in the receiver (400) through the inlet line (410) of the receiver, and the liquid refrigerant stored in the receiver (400) is discharged through the outlet line (420) to the liquid refrigerant transfer line (500), and is supplied to the expansion valve (700) through the electronic valve (600) and rapidly expanded, and the The refrigerant in a mist state that rapidly expands in the expansion valve (700) is supplied to the evaporator (800) through the inlet line (810) of the evaporator, and the low-temperature gaseous refrigerant that is supplied to the evaporator (800) and evaporates by a heat absorption action that takes away heat around the evaporator (800) through a heat exchange action with the indoor or internal heat exchange medium is discharged through the outlet line (820) and flows into the compressor (200) through the inlet line (220) of the compressor to be compressed at high temperature and high pressure, and this operation is repeated. The hot gas defrosting device of the prior art is configured such that the outlet line (210) of the compressor (200) and the inlet line (810) of the evaporator (800) are connected to a hot gas bypass line (900), and an electronic valve (910) is installed in the hot gas bypass line (900).

The hot gas defrosting device of the prior art configured as described above is configured to remove frost formed on the evaporator (800) by supplying a portion of the high-temperature, high-pressure gaseous refrigerant discharged through the outlet line (210) of the compressor (200) to the evaporator (800), by connecting the outlet line (210) of the compressor (200) and the inlet line (810) of the evaporator (800) to a hot gas bypass line (900), and to install an electronic valve (910) in the hot gas bypass line (900), so that frost formed on the evaporator (800) can be periodically removed while the refrigeration device is being operated.

That is, in the above-mentioned conventional technology, when the refrigerator is to be operated in normal operation, the electronic valve (910) installed in the hot gas bypass line (900) is turned off, and the high temperature and high pressure gaseous refrigerant compressed and discharged from the compressor (200) is completely introduced into the condenser (300). Therefore, the liquid refrigerant that is introduced into the condenser (300) and condensed and liquefied through heat exchange with an external heat exchange medium (air, water, etc.) is discharged through the outlet line (320) and temporarily stored in the receiver (400). The liquid refrigerant stored in the receiver (400) is discharged through the outlet line (420) and transferred to the liquid refrigerant transfer line (500) and rapidly expanded in the expansion valve (700). The refrigerant in a foggy state that is rapidly expanded in the expansion valve (700) is supplied to the evaporator (800). The foggy state supplied to the evaporator (800) The refrigerant lowers the temperature of the surroundings by taking heat from the surroundings through heat exchange with the indoor or internal heat exchange medium (air, water, etc.), and the refrigerant in the form of a mist supplied to the evaporator (800) evaporates in the process of taking heat from the indoor or internal heat exchange medium through heat absorption, and the low-temperature gaseous refrigerant that evaporates in this way is discharged through the outlet line (820) and introduced into the compressor (200) through the compressor inlet line (220) to repeat the compression operation.

Meanwhile, when it is desired to remove the frost generated and formed in the evaporator (800), the electronic valve (910) formed in the hot gas bypass line (900) is operated in the on (open) state, and when the electronic valve (910) installed in the hot gas bypass line (900) is operated in the on state, the high temperature and high pressure gaseous refrigerant compressed and discharged from the compressor (200) is not transferred in full to the condenser (300) but some of it is transferred to the hot gas bypass line (900) in which the electronic valve (910) is opened (on).

As described above, when the solenoid valve (910) installed in the hot gas bypass line (900) is opened to the on operating state, a portion of the high temperature and high pressure gaseous refrigerant discharged from the compressor (200) is transferred to the hot gas bypass line (900) and supplied to the evaporator (800) through the inlet line (810) of the evaporator, and the high temperature and high pressure gaseous refrigerant transferred to the hot gas bypass line (900) and supplied to the evaporator (800) removes the frost formed on the evaporator (800). However, the high temperature and high pressure gaseous refrigerant supplied to the evaporator (800) is condensed and liquefied in the process of removing the frost. In the process of condensing and liquefying the gaseous refrigerant, there is refrigerant that has not evaporated. Accordingly, if the refrigerant that has not evaporated flows into the compressor (200), it may cause wear of the compressor due to liquid compression during the compression operation of the compressor (200). It is pointed out as a problem that this is the cause of a failure of the compressor (200).

The present invention has been proposed to solve various problems appearing in the above-mentioned prior art, and is configured to remove frost formed and formed in the evaporator by selectively controlling whether the entire amount of high-temperature, high-pressure gaseous refrigerant discharged through the outlet line of the compressor provided in the middle of the refrigerant circulation line constituting the refrigerating device is transferred to the condenser side or the evaporator side, and further, the invention aims to provide a refrigerating device configured so that only evaporated gaseous refrigerant can be introduced into the compressor even when the entire amount of high-temperature, high-pressure gaseous refrigerant discharged from the compressor is selectively controlled to be transferred to either the condenser side or the evaporator side.

The present invention is a means for pursuing the above-mentioned object, and the evaporator defrosting device of the refrigerating device of the present invention comprises a compressor provided in the middle of a refrigerant circulation line, a condenser for condensing and liquefying high-temperature and high-pressure gaseous refrigerant compressed and discharged from the compressor, a receiver for storing the liquid refrigerant at room temperature condensed and liquefied in the condenser, an expansion valve for rapidly expanding the liquid refrigerant discharged from the receiver, and an evaporator for cooling or cooling the interior to a set temperature by heat exchange with a heat exchange medium inside the interior, wherein a mist refrigerant circulation passage through which mist refrigerant rapidly expanded by an expansion valve formed in a first liquid refrigerant discharge line connected to a first discharge port through which liquid refrigerant stored in the receiver is discharged circulates, and a liquid refrigerant circulation passage through which liquid refrigerant supplied by the pumping operation of a refrigerant pump installed in a second liquid refrigerant transfer line connected to a second discharge port of the receiver circulates is provided in parallel. It is characterized in that it is configured to include a plate heat exchanger, and further includes a four-way solenoid valve for removing frost, which is installed between the compressor and the condenser and is configured to supply high-temperature, high-pressure gaseous refrigerant by selecting either the condenser or the evaporator from the high-temperature, high-pressure gas discharged through the outlet line of the compressor.

In addition, the four-way solenoid valve for removing the refrigerant is characterized in that it is configured to have a main refrigerant inlet connected to the outlet line of the compressor so that the high temperature and high pressure gaseous refrigerant discharged from the compressor can be introduced therein, a one-side refrigerant inlet for supplying the gaseous refrigerant introduced into the main refrigerant inlet to the condenser, a central refrigerant inlet to which a refrigerant transfer line for transporting the refrigerant discharged to the liquid refrigerant outlet of the liquid refrigerant circulation passage provided in parallel to the plate heat exchanger is connected, and the other-side refrigerant inlet to which a refrigerant supply line for transporting the refrigerant introduced into the central refrigerant inlet to the evaporator side is connected.

In addition, the four-way solenoid valve for removing the refrigerant is configured so that, when the valve is in the on (open) operation, the high-temperature, high-pressure gaseous refrigerant discharged through the outlet line of the compressor flows into the main refrigerant inlet and is discharged to the condenser side through the refrigerant inlet on one side, while the liquid refrigerant flowing into the liquid refrigerant inlet of the liquid refrigerant circulation passage of the plate heat exchanger is cooled by heat exchange with the mist refrigerant circulating in the mist refrigerant circulation passage while circulating in the liquid refrigerant circulation passage, and is discharged through the liquid refrigerant outlet to the cooled refrigerant transfer line and flows into the central refrigerant inlet and is discharged through the refrigerant supply line connected to the refrigerant inlet on the other side, so that the liquid refrigerant cooled while circulating in the liquid refrigerant circulation passage of the plate heat exchanger can be supplied to the evaporator.

In addition, the four-way solenoid valve for removing frost is configured so that, when the valve is in the off (closed) operation, the high temperature and high pressure gaseous refrigerant discharged through the outlet line of the compressor flows into the main refrigerant inlet and is supplied to the evaporator side through the refrigerant supply line connected to the refrigerant outlet on the other side, thereby removing frost formed on the evaporator, and, while the cooled liquid refrigerant that circulates through the liquid refrigerant circulation passage of the plate heat exchanger and is discharged through the liquid refrigerant outlet is configured so that it flows into the central refrigerant inlet through the cooled refrigerant transfer line and can be supplied to the condenser through the refrigerant outlet on one side.

In addition, it is characterized in that it further includes a four-way solenoid valve for frost delay, which is installed between the plate heat exchanger and the evaporator and has a function of controlling the refrigerant flowing in through the main refrigerant inlet to be supplied by selecting either the inlet of the evaporator or the outlet of the evaporator.

In addition, the refrigerant recovery line for recovering the refrigerant that has performed heat exchange with an indoor (or internal) heat exchange medium while circulating through the evaporator and the second liquid refrigerant transfer line for transferring the liquid refrigerant discharged from the second discharge port of the receiver are connected to a bypass line having a refrigerant recovery solenoid valve installed, and the refrigerant recovery line is characterized in that it is connected to the receiver by a refrigerant recovery extension line having a refrigerant recovery solenoid valve installed so that the refrigerant recovered from the evaporator can be stored in the receiver.

In addition, the liquid separator is inserted and installed inside the receiver, and the gas refrigerant outlet of the mist refrigerant circulation passage installed in the plate heat exchanger and the inlet of the liquid separator are connected to a gas refrigerant suction line, and the outlet of the liquid separator and the inlet line of the compressor are connected to a gas refrigerant discharge line.

The evaporator defrosting method of the refrigerating device of the present invention comprises a refrigerating cycle comprising a compressor provided in the middle of a refrigerant circulation line, a condenser for condensing and liquefying high-temperature and high-pressure gaseous refrigerant extruded and discharged from the compressor, a receiver for storing the high-temperature liquid refrigerant condensed and liquefied in the condenser, an expansion valve for rapidly expanding the liquid refrigerant discharged from the receiver, and an evaporator for cooling the interior to a set temperature by heat exchange with an indoor heat exchange medium, wherein the refrigerating device is configured to selectively supply high-temperature and high-pressure gaseous refrigerant discharged from the compressor to either the condenser or the evaporator by the on/off operation of a four-way solenoid valve for defrosting, the main refrigerant inlet of which is connected to the outlet line of the compressor, and when it is desired to remove the frost formed on the evaporator, the four-way solenoid valve for defrosting, the main refrigerant inlet of which is connected to the outlet line of the compressor, is turned off to remove the frost discharged from the compressor. It is configured so that high temperature and high pressure gaseous refrigerant flows into the main refrigerant inlet, discharges through the other refrigerant inlet, and is supplied to the evaporator through the refrigerant supply line, so that the high temperature and high pressure gaseous refrigerant supplied to the evaporator and circulated removes frost formed on the evaporator, and the gaseous refrigerant discharged through the gas refrigerant outlet of the mist refrigerant circulation passage provided in the plate type heat exchanger is configured so that it repeats the operation of flowing into the compressor, while the cooled refrigerant discharged through the liquid refrigerant outlet of the liquid refrigerant circulation passage provided in the plate type heat exchanger flows into the central refrigerant inlet of the four-way solenoid valve for removing frost through the cooled refrigerant transfer line, discharges through one refrigerant inlet, and is supplied to the condenser, where it is condensed and liquefied through heat exchange with an external heat exchange medium, and is stored in a liquid receiver, and then is supplied to the mist refrigerant circulation passage and the liquid refrigerant circulation passage provided in the plate type heat exchanger through the first and second liquid refrigerant transfer lines, respectively, and repeats the circulation operation of being supplied. It is characterized by being composed of:

In addition, during normal operation of the above refrigeration device, the refrigerant recovery solenoid valve installed in the bypass line connecting the second liquid refrigerant transfer line connected to the second discharge port of the receiver and the refrigerant recovery line for recovering the refrigerant that has performed the evaporation is operated in the on state, while the refrigerant recovery solenoid valve installed in the refrigerant recovery extension line formed as an extension to the refrigerant recovery line is operated in the off state, so that the refrigerant recovered through the refrigerant recovery line after circulating through the evaporator is transferred to the bypass line where the refrigerant recovery solenoid valve is operated in the on state and transferred to the plate heat exchanger side through the second liquid refrigerant transfer line, and during defrosting operation of the above refrigeration device, the refrigerant recovery solenoid valve installed in the bypass line is operated in the off state, while the refrigerant recovery solenoid valve installed in the refrigerant recovery extension line is operated in the on state, so that the refrigerant recovered through the refrigerant recovery line after circulating through the evaporator is operated in the on state, so that the refrigerant recovery solenoid valve opened by the on state is installed. It is characterized by being configured to be transported to an existing refrigerant recovery extension line and stored in a liquid receiver.

According to the present invention, when a room is to be cooled or food or goods are to be frozen and refrigerated using a refrigeration device, the refrigeration cycle of the refrigeration device is operated in normal operation, and the high-temperature, high-pressure gaseous refrigerant discharged from the compressor is entirely transferred to the condenser, and the room-temperature liquid refrigerant condensed and liquefied in the condenser is transferred to and stored in a receiver, and the liquid refrigerant stored in the receiver is transferred to the first and second liquid refrigerant transfer lines, respectively, and transferred to and circulated in the mist refrigerant circulation passage and the liquid refrigerant circulation passage respectively installed in the plate heat exchanger, and the gaseous refrigerant discharged through the gas refrigerant outlet of the mist refrigerant circulation passage is fed into the compressor, and the cooled liquid refrigerant discharged through the liquid refrigerant outlet of the liquid refrigerant circulation passage is supplied to the evaporator and circulated, and the operation is repeated, and the high-temperature, high-pressure gaseous refrigerant discharged from the compressor is supplied to the evaporator and circulated, and the means for operating the refrigeration cycle of the refrigeration device in defrost operation is configured to be By configuring it so that the refrigerant is transferred to the evaporator side by the off operation and the frost formed on the evaporator is removed, and by configuring the refrigerant discharged after circulating through the liquid refrigerant circulation passage of the plate heat exchanger to be transferred to the condenser side by the off operation of the four-way solenoid valve for removing frost, the entire amount of the high-temperature, high-pressure gaseous refrigerant discharged from the compressor is supplied to the evaporator side, thereby having the effect of quickly removing the frost formed on the evaporator.

In addition, the refrigerant in a fog state circulating in the fog refrigerant circulation passage installed in conjunction with the plate heat exchanger can supply the gaseous refrigerant to the compressor by evaporating through a heat exchange action that takes heat from the liquid refrigerant circulating in the liquid refrigerant circulation passage, thereby having the effect of preventing and eliminating the cause of compressor failure in advance.

Figure 1 is a circuit configuration diagram showing the circulation operation state of the refrigerant circulating in the refrigerant circulation line of the refrigeration cycle during normal operation of the refrigeration device of the present invention.

Figure 2 is a circuit configuration diagram showing the circulation operation state of the refrigerant circulating in the refrigerant circulation line of the refrigeration cycle during the defrosting operation of the refrigeration device of the present invention.

Figure 3 is a refrigeration cycle circuit configuration diagram of another embodiment of the refrigeration device of the present invention.

Figures 4(a) and (b) are enlarged views of the “X” portion of Figure 2, showing the operating status of a four-way solenoid valve for delaying frost formation on an evaporator of a refrigerating device of the present invention and the circulation status of refrigerant.

Figure 5 is a plan view of a four-way solenoid valve for removing frost and delaying frost deposition that constitutes the refrigeration cycle of the refrigeration device of the present invention.

Figures 6 and 7 are operation state diagrams of the four-way solenoid valve for removing frost and delaying frost deposition that constitute the refrigeration cycle of the refrigeration device of the present invention.

Figure 6 shows the refrigerant circulation operation state when the piston valve of the four-way solenoid valve has moved to the right.

Figure 7 shows the refrigerant circulation operation state when the piston valve of the four-way solenoid valve has moved to the left.

Figure 8 is a refrigeration cycle circuit configuration diagram of a conventional refrigeration device.

Specific structural or functional descriptions of embodiments according to the concept of the present invention disclosed in this specification are merely exemplified for the purpose of explaining embodiments according to the concept of the present invention, and embodiments according to the concept of the present invention can be implemented in various forms and are not limited to the embodiments described in this specification.

Hereinafter, a specific embodiment of an evaporator defrosting device and a defrosting method of a refrigerating device according to the present invention will be described in detail with reference to the attached drawings.

The city of Fig. 1 is a refrigeration cycle circuit configuration diagram of a preferred embodiment of the refrigeration device of the present invention, and is a diagram showing the refrigerant circulation operation state when the refrigeration device is in normal operation.

The normal operation of the refrigeration device of the present invention means that the high temperature and high pressure gaseous refrigerant discharged through the outlet line (21) of the compressor (2) provided in the middle of the refrigerant circulation line (1) of the refrigeration cycle configured as a closed circuit is configured to flow into the condenser (3) and sequentially circulate through the receiver (4), expansion valve (6), plate heat exchanger (7), and evaporator (8).

In the refrigeration device of the present invention, the main refrigerant inlet (11) of a four-way solenoid valve (10a) for removing frost is connected to the outlet line (21) of the compressor (2) provided in the middle of the refrigerant circulation line (1) of the refrigeration cycle, and the inlet line (31) of the condenser (3) is connected to the refrigerant outlet (12) on one side of the four-way solenoid valve (10a) for removing frost.

The outlet line (32) of the above condenser (3) is connected to the inlet (41) of the receiver (4), a first liquid refrigerant transfer line (51) is connected to the first discharge port (42) of the receiver (4), and a second liquid refrigerant transfer line (52) is connected to the second discharge port (43) of the receiver (4).

In the first liquid refrigerant transfer line (51) connected to the first discharge port (42) of the above-mentioned receiver (4), an electronic valve (53) and an expansion valve (6) are installed at regular intervals, and in the second liquid refrigerant transfer line (52) connected to the second discharge port (43) of the above-mentioned receiver (4), a refrigerant pump (5) is installed.

In addition, each of the first and second liquid refrigerant transfer lines (51)(52) is connected to a plate heat exchanger (7), and the first liquid refrigerant transfer line (51) is connected to a gas refrigerant inlet (71) of a mist refrigerant circulation passage (7a) installed in parallel with the plate heat exchanger (7) so as to supply mist refrigerant rapidly expanded by the expansion valve (6) to the mist refrigerant circulation passage (7a), and the second liquid refrigerant transfer line (52) is connected to a liquid refrigerant inlet (73) of a liquid refrigerant circulation passage (7b) installed in parallel with the mist refrigerant circulation passage (7a) to the plate heat exchanger (7) so as to supply liquid refrigerant pumped by the refrigerant pump (5) to the liquid refrigerant inlet (73) of the liquid refrigerant circulation passage (7b).

And the refrigerant in the fog state circulating in the fog refrigerant circulation passage (7a) installed in the plate heat exchanger (7) is evaporated into a low-temperature gaseous state in the process of performing a heat exchange operation in which heat is taken from the liquid refrigerant circulating in the liquid refrigerant circulation passage (7b), discharged through the gas refrigerant outlet (72), and introduced into the compressor (2) through the inlet line (22) of the compressor, and the liquid refrigerant circulating in the liquid refrigerant circulation passage (7b) installed in the plate heat exchanger (7) is cooled through the heat exchange operation in which heat is taken from the fog refrigerant circulating in the fog refrigerant circulation passage (7a), discharged through the liquid refrigerant outlet (74), and introduced into the central refrigerant inlet (13) formed in the four-way solenoid valve (10a) for frost removal through the cooled refrigerant transfer line (75), and the cooled liquid refrigerant introduced into the central refrigerant inlet (13) is cooled down on the other side It is configured to be discharged through the refrigerant inlet (14) and transferred to the refrigerant supply line (76).

In addition, the liquid refrigerant transferred to the refrigerant supply line (76) passes through the opened solenoid valve (77) and is transferred to the four-way solenoid valve (10b) for frost deposition delay, and the liquid refrigerant transferred to the four-way solenoid valve (10b) for frost deposition delay is supplied to the evaporator (8) side and is configured to perform heat exchange operation with a heat exchange medium (air, water, etc.) existing indoors (meaning the space where the evaporator is installed) while circulating through the refrigerant circulation coil (not shown) installed in the evaporator.

Meanwhile, the four-way solenoid valve (10a) for removing frost and the four-way valve (10b) for delaying frost formation that supplies refrigerant to the evaporator (8) connected to the outlet line (21) of the compressor (2) above use valve parts currently used in the refrigeration system industry, so a description of their specific configuration and operation will be omitted. However, a description will be made of the configuration and operation effects necessary to remove frost formed on the evaporator using the refrigerant circulating in the refrigeration cycle in the refrigeration device of the present invention.

Since the above four-way solenoid valve (10a) for removing the above-mentioned sex and the four-way solenoid valve (10b) for delaying the sex have the same configuration, each component will be described using the same name.

The above four-way solenoid valve (10a) for removing frost and the four-way solenoid valve (10b) for delaying frost are each equipped with a cylinder valve body (15a), a piston valve (15b) that is inserted and installed inside the cylinder valve body (15a) so as to be able to reciprocate in the longitudinal direction of the cylinder valve body (15a), an solenoid valve body (15c) that is installed in a state exposed to one side of the cylinder valve body (15a), and an operating unit (15d) configured to alternately supply the high-temperature, high-pressure gaseous refrigerant that is introduced into the main refrigerant inlet (11) by the solenoid valve body (15c) through the one-side and the other-side refrigerant inlets (16a)(16b) formed at both ends of the cylinder valve body (15a), and also the above A piston valve (15b) is configured such that a one-side connecting passage (17) for transferring high-temperature, high-pressure gaseous refrigerant flowing into the main refrigerant inlet (11) to a one-side refrigerant outlet (12) and a other-side connecting passage (18) for transferring high-temperature, high-pressure gaseous refrigerant flowing into the main refrigerant inlet (11) to the other-side refrigerant outlet (14) are symmetrically formed, and a U-shaped connecting passage (19) is formed between the one-side and other-side connecting passages (17)(18) for alternately connecting the central refrigerant outlet (13) to the other-side refrigerant outlet (14) and the one-side refrigerant outlet (12) respectively.

In addition, when the four-way solenoid valve (10a) for removing the frost and the four-way solenoid valve (10b) for delaying frost adhesion configured as described above are turned on, the piston valve (15b) moves to the right in the drawing due to the refrigerant injection pressure injected through the one-side refrigerant inlet (16a) as illustrated in FIG. 6, and in this case, the one-side connecting passage (17) connects the main refrigerant inlet (11) and the one-side refrigerant outlet (12) at the same time, the U-shaped connecting passage (19) connects the central refrigerant outlet (13) and the other-side refrigerant outlet (14), and both ends of the other-side connecting passage (18) are blocked by the inner surface of the cylinder valve body (15a), and in contrast, as illustrated in FIG. 7, the piston valve (15b) moves to the right in the drawing due to the refrigerant injection pressure injected through the other-side refrigerant inlet (16b). When the piston valve (15b) moves to the left in the drawing, the other-side connecting passage (18) connects the main refrigerant inlet (11) and the other-side refrigerant outlet (14), and at the same time, the U-shaped connecting passage (19) connects the central refrigerant outlet (13) and one-side refrigerant outlet (12), and both ends of the one-side connecting passage (17) are blocked by the inner surface of the cylinder valve body (15a).

As described above, when the refrigeration cycle of the refrigeration device of the present invention is in normal operation, the four-way solenoid valve (10a) for removing frost, in which the main refrigerant inlet (11) is connected to the outlet line (21) of the compressor (2), is turned on. In this case, as shown in FIG. 6, the piston valve (15b) of the four-way solenoid valve (10a) for removing frost is moved to the left in the drawing, so that the high-temperature and high-pressure gaseous refrigerant discharged through the outlet line (21) of the compressor (2) flows into the main refrigerant inlet (11), is discharged through the one-side connecting passage (17) to the one-side refrigerant inlet (12), and flows into the condenser (3). The high-temperature and high-pressure gaseous refrigerant flowing into the condenser (3) is condensed and liquefied through heat exchange with a heat exchange medium (air, water, etc.) from the outside (meaning the space where the condenser is installed) and is discharged through the outlet line (32). It flows into the sap receiver (4) through the inlet (41) of the sap receiver (41) and is temporarily stored.

The liquid refrigerant stored in the above-mentioned receiver (4) is discharged through the first and second discharge ports (42)(43) and transferred to the first and second liquid refrigerant transfer lines (51)(52). At this time, the liquid refrigerant transferred to the first liquid refrigerant transfer line (51) is rapidly expanded into a refrigerant in a fog state by the expansion valve (6) and flows into the gas refrigerant inlet (71) of the fog refrigerant circulation passage (7a) installed in the plate heat exchanger (7) and circulated, while the liquid refrigerant transferred to the second liquid refrigerant transfer line (52) is pumped by the refrigerant pump (5) and flows into the liquid refrigerant inlet (73) of the liquid refrigerant circulation passage (7b) installed in the plate heat exchanger (7) and circulated. In this way, the fog refrigerant circulation passage (7a) installed in the plate heat exchanger (7) and the liquid refrigerant The mist-state refrigerant and the liquid-state refrigerant circulating separately through each of the circulation passages (7b) exchange heat with each other. At this time, the mist-state refrigerant circulating through the mist-state refrigerant circulation passage (7a) evaporates into a gaseous state in the process of performing a heat exchange operation that takes heat from the liquid-state refrigerant circulating through the liquid-state refrigerant circulation passage (7b), is discharged through the gaseous refrigerant outlet (72), and is introduced into the compressor (2) through the inlet line (22) of the compressor (2). Meanwhile, the liquid-state refrigerant circulating through the liquid-state refrigerant circulation passage (7b) is cooled through a heat exchange operation that takes heat from the mist-state refrigerant circulating through the mist-state refrigerant circulation passage (7a). The liquid-state refrigerant cooled through the heat exchange operation while circulating through the liquid-state refrigerant circulation passage (7b) is discharged through the liquid-state refrigerant outlet (74) and is transferred to the cooling refrigerant transfer line (75) and is supplied to the center of the four-way solenoid valve (10a) for removing frost. The cooled liquid refrigerant flowing into the central refrigerant inlet (13) is transported through the U-shaped connecting passage (19) and discharged through the refrigerant inlet (14) on the other side.

As described above, when the refrigerator is operating normally, the cooled liquid refrigerant discharged through the other refrigerant inlet (14) of the four-way solenoid valve (10a) for frost removal is transferred to the refrigerant supply line (76) and flows into the main refrigerant inlet (11) of the four-way solenoid valve (10b) for frost formation delay, and is supplied to the evaporator (8) side and circulated. The four-way solenoid valve (10b) for frost formation delay is a means for supplying the cooled liquid refrigerant flowing into the main refrigerant inlet (11) to the inlet (81) side of the evaporator (8) or to the outlet (82) side of the evaporator (8), and can delay the formation of frost generated by the temperature difference in the evaporator (8).

To this end, as shown in (a) of Fig. 4, when the four-way solenoid valve (10b) for frost-delay is adjusted to the on operation, the cooled liquid refrigerant flowing into the main refrigerant inlet (11) is discharged through the one-side connecting passage (17) to the one-side refrigerant outlet (12) and circulates in the forward direction through the refrigerant circulation coil (not shown) installed in the pipe to the evaporator (8) through the inlet (81) of the evaporator (8), and then performs a heat exchange action with the heat exchange medium in the room (meaning the space where the evaporator is installed), and then is discharged through the outlet (82), flows into the other-side refrigerant outlet (14), is transferred to the U-shaped connecting passage (19), is discharged through the central refrigerant outlet (13), and is transferred to the refrigerant recovery line (83). In contrast, as shown in (b) of Fig. 4, the four-way solenoid valve for frost-delay can be configured to When the four-way solenoid valve (10b) is controlled to the off operation, the cooled liquid refrigerant flowing into the main refrigerant inlet (11) is discharged to the other side refrigerant inlet (14) through the other side connecting passage (18), circulates in the reverse direction through the refrigerant circulation coil (not shown) installed in the evaporator (8) through the outlet (82) of the evaporator (8), performs a heat exchange action with the heat exchange medium in the room (meaning the space where the evaporator is installed), and is then discharged through the inlet (81), flows into the one-side refrigerant inlet (12) of the four-way solenoid valve (10b) for frost deposition delay, is transferred to the U-shaped connecting passage (19), discharged through the central refrigerant inlet (13), and transferred to the refrigerant recovery line (83).

The above four-way solenoid valve (10b) for delayed frost attachment is configured to perform an on/off operation periodically for a certain period of time, and can be configured to delay frost attachment generated in the evaporator (8).

Meanwhile, the liquid refrigerant supplied to the evaporator (8) performs a heat exchange operation with a heat exchange medium (air, etc.) existing indoors (meaning the space where the evaporator is installed) while circulating through a refrigerant circulation coil (not shown) installed in the evaporator (8) and then is discharged from the evaporator (8) and transferred to the refrigerant recovery line (83). The refrigerant may be transferred to the second liquid refrigerant transfer line (52) connected to the second discharge port (43) of the receiver (4) through a bypass line (84) connecting the refrigerant recovery line (83) and the second liquid refrigerant transfer line (52), or may be stored in the receiver (4) through a refrigerant recovery extension line (85) that is extended from the refrigerant recovery line (83). To this end, each of the bypass line (84) and the refrigerant recovery extension line (85) is configured to be alternately turned on/off. A refrigerant recovery electronic valve (86) and a refrigerant recovery electronic valve (87) are each installed.

For example, when the refrigerator is operated in normal operation, the refrigerant recovery electronic valve (86) installed in the bypass line (84) is operated in the on state, while the refrigerant recovery electronic valve (87) installed in the refrigerant recovery extension line (85) is configured to operate in the off state, so that the refrigerant supplied to the evaporator (8) and transferred to the refrigerant recovery line (73) after performing a heat exchange operation is not transferred to the receiver (4) side, but is transferred to the bypass line (84) and circulated through the liquid refrigerant circulation path (7b) installed in parallel to the plate heat exchanger (7) through the second liquid refrigerant transfer line (52). In contrast, when the refrigerator is operated in defrost operation, the refrigerant recovery electronic valve (86) installed in the bypass line (84) is operated in the off state, while the refrigerant recovery electronic valve (87) installed in the refrigerant recovery extension line (85) is configured to operate in the off state. By configuring it to operate on, the refrigerant supplied to the evaporator (8) and transferred to the refrigerant recovery line (83) after performing a heat exchange operation can be configured to be transferred to the refrigerant recovery extension line (85) instead of being transferred to the bypass line (84) and stored in the receiver (4).

In addition, the refrigeration device of the present invention is another embodiment in which a liquid separator is inserted and installed inside a liquid receiver as illustrated in FIG. 3 to configure a refrigeration cycle, and the refrigeration cycle of the other embodiment is configured such that a gaseous refrigerant suction line (93) is connected to the inlet (91) of the liquid separator (9) inserted and installed in a state of being immersed in liquid refrigerant stored inside the liquid receiver (4) and a gaseous refrigerant discharge line (94) is connected to the outlet (92) of the mist refrigerant circulation passage (7a) installed in conjunction with the plate heat exchanger (7), and the gaseous refrigerant discharged through the gaseous refrigerant outlet (72) of the mist refrigerant circulation passage (7a) installed in conjunction with the plate heat exchanger (7) is configured such that the gaseous refrigerant discharged through the gaseous refrigerant outlet (72) of the mist refrigerant circulation passage (7a) installed in conjunction with the plate heat exchanger (7) is introduced into the inlet (91) of the liquid separator (9) and discharged through the outlet (92), thereby performing a heat exchange operation with the liquid refrigerant stored in the liquid receiver (4). The outlet (92) of the liquid separator (9) is configured so that the evaporated gaseous refrigerant can be discharged and introduced into the compressor (2), and since the other refrigerant circulation configuration is similar to the preferred embodiment of Fig. 1, a description of the specific configuration and operational effects will be omitted.

The operational effects when the refrigeration device of the present invention configured as described above is operated in normal operation and in defrost operation are explained as follows.

First, we will explain when the refrigeration cycle of the refrigerator is operating normally.

During normal operation of the refrigeration cycle of the refrigerator, as shown in Fig. 1, the solenoid valve for removing frost (10a) and the solenoid valve for delaying frost deposition (10b) must be operated in the on state, and then the solenoid valves installed at various locations in the refrigerant circulation line (1) for circulating and supplying refrigerant to each of the major components must be controlled by a control means that selectively operates them on (open) and off (close).

For example, the solenoid valve (53) installed in the first liquid refrigerant transfer line (51) connecting the gas refrigerant inlet (71) of the mist refrigerant circulation passage (7a) installed in the receiver (4) and the plate heat exchanger (7), the solenoid valve (77) installed in the refrigerant supply line (76) connecting the other side refrigerant inlet (14) of the four-way solenoid valve (10a) for frost removal and the main refrigerant inlet (11) of the four-way solenoid valve (10b) for frost deposition delay, and the solenoid valve (86) for refrigerant recovery installed in the bypass line (84) connecting the second liquid refrigerant transfer line (52) connected to the second discharge port (43) of the receiver (4) and the refrigerant recovery line (83) for recovering the refrigerant discharged after performing heat exchange with the heat exchange medium while circulating through the evaporator (8) are operated in the on (open) state, In order to store the refrigerant recovered through the above refrigerant recovery line (83) in the receiver (4), the refrigerant recovery solenoid valve (87) installed in the refrigerant recovery extension line (85) is operated in the off (closed) state.

In addition, when the above-described solenoid valve (10a) for removing frost and the solenoid valve (10b) for delaying frost are turned on, each of the solenoid valves (10a) (10b) moves the piston valve (15b) to the right in the drawing as shown in FIG. 6, and accordingly, the main refrigerant inlet (11) and the one-side refrigerant outlet (12) are connected by the one-side connecting passage (17), and the central refrigerant outlet (13) and the other-side refrigerant outlet (14) are connected by the U-shaped connecting passage (19). In addition, the refrigeration device is operated normally by turning the solenoid valves installed at various locations of the above-described refrigerant circulation line (1) on/off.

As described above, when the refrigeration cycle of the refrigerator is operated normally, the high temperature and high pressure gaseous refrigerant discharged through the outlet line (21) of the compressor (2) flows into the main refrigerant inlet (11) of the defrosting solenoid valve (10a) and is discharged through the one-side connecting passage (17) to the one-side refrigerant inlet (12). The high temperature and high pressure gaseous refrigerant discharged through the one-side refrigerant inlet (12) of the defrosting solenoid valve (10a) flows into the inlet line (31) of the condenser (3). The high temperature and high pressure gaseous refrigerant flowing into the condenser (3) is condensed and liquefied through heat exchange with a heat exchange medium (air, water, etc.) in the outdoors (meaning the space where the condenser is installed) and discharged through the outlet line (32). At this time, the refrigerant condensed and liquefied through heat exchange with the heat exchange medium in the condenser (3) is at room temperature (approximately 40°C). The liquid refrigerant flows in through the inlet (41) of the receiver (4) and is temporarily stored in the receiver (4).

The liquid refrigerant stored in the above-mentioned receiver (4) is discharged through the first and second discharge ports (42)(43). At this time, the liquid refrigerant discharged through the first discharge port (42) of the receiver (4) is transferred to the first liquid refrigerant transfer line (51), passes through the opened solenoid valve (53), and is rapidly expanded by the expansion valve (6). The refrigerant in a fog state rapidly expanded through the expansion valve (6) is introduced into the gas refrigerant inlet (71) of the fog refrigerant circulation passage (7a) installed in the plate heat exchanger (7) and circulates through the fog refrigerant circulation passage (7a). Meanwhile, the liquid refrigerant discharged through the second discharge port (43) of the receiver (4) is transferred by the pumping operation of the refrigerant pump (5) installed in the second liquid refrigerant transfer line (52) and is circulated through the liquid refrigerant installed in the plate heat exchanger (7). It flows into the liquid refrigerant inlet (73) of the circulation passage (7b) and circulates through the liquid refrigerant circulation passage (7b).

Accordingly, the fog-state refrigerant and the liquid-state refrigerant circulating through the fog-state refrigerant circulation passage (7a) and the liquid-state refrigerant circulation passage (7b) respectively provided in the plate heat exchanger (7) circulate while performing a heat exchange action with each other. At this time, the fog-state refrigerant circulating through the fog-state refrigerant circulation passage (7a) evaporates by taking heat from the liquid-state refrigerant circulating through the liquid-state refrigerant circulation passage (7b), whereas the liquid-state refrigerant circulating through the liquid-state refrigerant circulation passage (7b) is cooled by taking heat from the fog-state refrigerant circulating through the fog-state refrigerant circulation passage (7a).

As described above, the fog-state refrigerant and the liquid-state refrigerant, which perform heat exchange while circulating separately through the fog-state refrigerant circulation passage (7a) and the liquid-state refrigerant circulation passage (7b) installed in parallel to the plate heat exchanger (7), respectively, perform heat exchange with each other. While circulating separately through the fog-state refrigerant circulation passage (7a) and the liquid-state refrigerant circulation passage (7b), the fog-state refrigerant is evaporated into a gaseous state through a heat exchange action that takes away heat, discharged through the gaseous refrigerant outlet (72), and then introduced into the compressor (2) through the inlet line (22) of the compressor, and this operation is repeated. Meanwhile, the liquid-state refrigerant circulating through the liquid-state refrigerant circulation passage (7b) is cooled through a heat exchange action that takes away heat during circulation, and the liquid-state refrigerant that is cooled in this way is discharged through the liquid-state refrigerant outlet (74) and transferred to the cooling refrigerant transfer line (75) and then to the other side refrigerant inlet (14) of the four-way solenoid valve (10a) for removing frost. The cooled liquid refrigerant flowing into the other side refrigerant inlet (14) is transported to the central refrigerant inlet (13) through the U-shaped connecting passage (19) and discharged.

The cooled liquid refrigerant discharged through the central refrigerant inlet (13) of the above-mentioned four-way solenoid valve (10a) for frost removal is transferred to the refrigerant supply line (76), passes through the opened solenoid valve (77), and flows into the main refrigerant inlet (11) of the four-way solenoid valve (10b) for frost delay. At this time, since the four-way solenoid valve (10b) for frost delay is in the on state, the cooled liquid refrigerant flowing into the main refrigerant inlet (11) is transferred and discharged to the one-side refrigerant inlet (12) through the one-side connecting passage (17) and flows into the inlet (81) of the evaporator (8). The cooled liquid refrigerant flowing into the inlet (81) in this way is piped to the evaporator (8). While circulating in the forward direction through the refrigerant circulation coil (not shown), the refrigerant performs a heat exchange action with the heat exchange medium in the room (meaning the space where the evaporator is installed) and is then discharged through the outlet (82). At this time, the cooled liquid refrigerant flowing into the inlet (81) of the evaporator (8) is in a cooled state where heat has been taken from the refrigerant in a mist state while circulating through the liquid refrigerant circulation passage (7b) of the plate heat exchanger (7), so that the room (the space where the evaporator is installed) can be cooled or cooled to a comfortable temperature while circulating through the evaporator (8).

However, when the liquid refrigerant cooled by heat exchange with the refrigerant in a mist state while circulating through the liquid refrigerant circulation passage (7b) of the plate heat exchanger (7) as described above is introduced through the inlet (81) of the evaporator (8) and circulated, a phenomenon of frost forming on a certain length of the refrigerant circulation coil (not shown) connected to the inlet (81) may occur. Because the cooled liquid refrigerant flowing into the inlet (81) of the evaporator (8) is much lower than the indoor temperature, frost may form and frost may form on a certain length of the refrigerant circulation coil (not shown) connected to the inlet (81) of the evaporator (8) due to the temperature difference, whereas frost does not form on a certain length of the refrigerant circulation coil (not shown) connected to the outlet (82) of the evaporator (8). This is because the cooled liquid refrigerant flowing into the inlet (81) of the evaporator (8) increases in temperature through heat exchange with the heat exchange medium in the indoor space (the space where the evaporator is installed) while circulating through the refrigerant circulation coil (not shown).

Therefore, as described above, it is necessary to delay the phenomenon of frost forming on the refrigerant circulation coil (not shown) installed in the evaporator (8) through the pipes, and to this end, the four-way solenoid valve (10b) for frost formation delay is repeatedly operated on and off at regular intervals, and the operation of discharging the liquid refrigerant flowing into the main refrigerant inlet (11) of the four-way solenoid valve (10b) for frost formation delay through one refrigerant outlet (12) and the operation of discharging it through the other refrigerant outlet (14) are alternately repeated, so that the cooled liquid refrigerant flowing into the main refrigerant inlet (11) of the four-way solenoid valve (10b) for frost formation delay can be transferred to the inlet (81) or the outlet (82) of the evaporator (8) at regular intervals.

When the above four-way solenoid valve (10a) for removing frost and the four-way solenoid valve (10b) for delaying frost formation are operated on, the piston valve (15b) moves to the right in the drawing as shown in FIG. 6, and when operated off, the piston valve (15b) moves to the left in the drawing as shown in FIG. 7, so that the main refrigerant inlet (11) is connected to the other side refrigerant outlet (14) by the other side connection passage (18), and the central refrigerant outlet (13) and one side refrigerant outlet (12) are connected by the U-shaped connection passage (19). Therefore, when the four-way solenoid valve (10b) for delaying frost formation is controlled to be operated on or off at regular intervals, the refrigerant circulation coil (not shown) installed in the evaporator (8) is subjected to frost. It can delay implantation.

That is, when the four-way solenoid valve (10b) for frost seizure delay is adjusted to the on operation as shown in (a) of Fig. 4, the piston valve (15b) of the four-way solenoid valve (10b) for frost seizure delay moves to the right in the drawing as shown in Fig. 6, and accordingly, the cooled liquid refrigerant transferred to the refrigerant supply line (76) flows into the main refrigerant inlet (11), is transferred through the one-side connecting passage (17), is discharged through the one-side refrigerant outlet (12), flows in through the inlet (81) of the evaporator (8), circulates through the evaporator (8), and is discharged through the outlet (82) to be transferred to the refrigerant recovery line (83). When the four-way solenoid valve (10b) for frost seizure delay is adjusted to the off operation as shown in (b) of Fig. 4, the piston valve (15b) moves to the right as shown in Fig. 7. As it moves to the left in the drawing, the cooled liquid refrigerant transferred to the refrigerant supply line (76) flows into the main refrigerant inlet (11), is transferred to the other refrigerant outlet (14) through the other side connecting passage (18) and discharged, and the cooled liquid refrigerant discharged into the other refrigerant outlet (14) circulates through the refrigerant circulation coil (not shown) installed in the evaporator (8) via the outlet (82) of the evaporator (8) and performs a heat exchange action with the heat exchange medium in the room (the space where the evaporator is installed) and is then discharged into the inlet (81) and flows into the one-side refrigerant outlet (12) of the four-way solenoid valve (10b) for frost deposition delay, is discharged to the central refrigerant outlet (13) through the U-shaped connecting passage (19), and is then transferred to the refrigerant recovery line (83).

As described above, when the refrigeration cycle of the refrigerator is normally operated, the liquid refrigerant that has circulated through the evaporator (8) and then recovered through the refrigerant recovery line (83) is not transferred to the refrigerant recovery extension line (85) in which the refrigerant recovery solenoid valve (87) is installed in an off (closed) operation, but is transferred to the second liquid refrigerant transfer line (52) connected to the second discharge port (43) of the receiver (4) through the bypass line (84) in which the refrigerant recovery solenoid valve (86) is installed in an on (open) operation, and is introduced into the liquid refrigerant inlet (73) of the liquid refrigerant circulation passage (7b) installed in parallel to the plate heat exchanger (7) by the pumping operation of the refrigerant pump (4) to repeat the circulation operation.

As described above, during normal operation of the refrigeration cycle of the refrigerator, the high temperature and high pressure gaseous refrigerant compressed by the compressor (2) and discharged through the outlet line (21) flows into the main refrigerant inlet (11) by the on operation of the four-way solenoid valve (10a) for frost removal, discharges through the refrigerant inlet (12) on one side, and flows into the condenser (3) through the inlet line (31) of the condenser (3) and circulates. The liquid refrigerant at room temperature discharged through the outlet line (32) after circulating through the condenser (3) flows into the receiver (4) and is temporarily stored, and then discharged through the first and second discharge ports (42)(43) and is transferred to the plate heat exchanger (7) through the first and second liquid refrigerant transfer lines (51)(52). The liquid refrigerant transferred through the first liquid refrigerant transfer line (51) is rapidly expanded by the expansion valve (6) and is transferred to the plate heat exchanger (7). The liquid refrigerant is introduced into the attached mist refrigerant circulation passage (7a) and circulated, while the liquid refrigerant transferred to the second liquid refrigerant transfer line (52) is pumped by the refrigerant pump (5) and introduced into the liquid refrigerant circulation passage (7b) attached to the plate heat exchanger (7) and circulated.

And the refrigerant in the fog state circulating in the fog refrigerant circulation passage (7a) installed in the plate heat exchanger (7) is changed into a gaseous state through a heat exchange action that takes heat from the liquid refrigerant while circulating in the liquid refrigerant circulation passage (7b) and is discharged through the gas refrigerant outlet (72) and is introduced into the compressor (2) through the inlet line (21) of the compressor (2), and this operation is repeated, while the liquid refrigerant circulating in the liquid refrigerant circulation passage (7b) is cooled through a heat exchange action that takes heat from the refrigerant in the fog state circulating in the fog refrigerant circulation passage (7a) and is discharged through the liquid refrigerant outlet (74), and the cooled liquid refrigerant discharged through the liquid refrigerant outlet (74) is transferred to the cooling refrigerant transfer line (75) and flows into the central refrigerant inlet (13) of the four-way solenoid valve (10a) for removing frost and is transferred through the U-shaped connecting passage (19). The liquid refrigerant is discharged through the other side refrigerant inlet (14) and circulates through the refrigerant circulation coil (not shown) connected to the evaporator (8) through the inlet (81) or outlet (82) of the evaporator (8) by the four-way solenoid valve (10b) for frost deposition delay, and performs heat exchange with the heat exchange medium in the room (the space where the evaporator is installed) and then discharged and transferred to the refrigerant recovery line (83). The liquid refrigerant transferred to the refrigerant recovery line (83) is transferred to the second liquid refrigerant transfer line (52) through the bypass line (84) in which the open-operated refrigerant recovery solenoid valve (86) is installed, and is introduced into the liquid refrigerant circulation passage (7b) of the plate heat exchanger (7) and circulated. This repeats the operation to cool the room where the evaporator (8) is installed to a set comfortable temperature or cool the inside of the showcase, etc. where the evaporator (8) is installed to a low temperature to safely refrigerate and freeze food, etc. It works.

Meanwhile, when the cooled liquid refrigerant is continuously introduced through the inlet (81) of the evaporator (8) while circulating through the liquid refrigerant circulation passage (7b) of the plate heat exchanger (7) during normal operation of the refrigeration device as described above, frost may form on a portion of the refrigerant circulation coil (not shown) connected to the inlet (81) of the evaporator (8) due to the temperature difference between the cooled liquid refrigerant and the heat exchange medium (air, water, etc.) in the room (the space where the evaporator is installed). Therefore, in order to delay the frost formation, the frost formation on the evaporator (8) can be delayed by means of alternately controlling the operation of the frost formation delay four-way solenoid valve (10b) to turn on/off at a predetermined time interval.

That is, when the four-way solenoid valve (10b) for delayed icing as shown in (a) of Fig. 4 is adjusted to the on operating state, the piston valve (15b) formed inside the cylinder valve body (15a) moves to the right in the drawing as shown in Fig. 6, and accordingly, the cooled liquid refrigerant transferred through the refrigerant supply line (76) flows into the main refrigerant inlet (11), is transferred through the one-side connecting passage (17), is discharged through the one-side refrigerant outlet (12), flows into the inlet (81) of the evaporator (8), and performs a heat exchange action while circulating in the forward direction through the refrigerant circulation coil (not shown) installed in the evaporator (8) and is then discharged through the outlet (82). The refrigerant discharged through the outlet (82) of the evaporator (8) flows into the other-side refrigerant outlet (14) and is discharged to the center through the U-shaped connecting passage (19). It is discharged through the refrigerant inlet (13) and transferred to the refrigerant recovery line (83), and in contrast, when the four-way solenoid valve (10b) for delayed frost adhesion is adjusted to the off operating state as shown in (b) of Fig. 4, the piston valve (15b) moves to the left in the drawing as shown in Fig. 7, and at this time, the cooled liquid refrigerant flowing into the main refrigerant inlet (11) is discharged through the other side refrigerant inlet (14) by the other side connecting passage (18), flows into the outlet (82) of the evaporator (8), and performs a heat exchange action while circulating in the reverse direction through the refrigerant circulation coil (not shown) installed in the evaporator (8) through the pipe, and then is discharged through the inlet (81), flows into the one side refrigerant inlet (12), discharged to the central refrigerant inlet (13) by the U-shaped connecting passage (19), and transferred to the refrigerant recovery line (83). Likewise, by alternately controlling the on/off operation of the four-way solenoid valve (10b) for frost deposition delay at regular intervals, the phenomenon of frost deposition on the refrigerant circulation coil (not shown) installed in the evaporator (8) can be delayed to some extent.

And, while circulating in the forward or reverse direction through the refrigerant circulation coil (not shown) installed in the evaporator (8) through the inlet (81) and outlet (82) of the evaporator (8), the refrigerant discharged and transferred to the refrigerant recovery line (83) performs a heat exchange operation, and is transferred to a bypass line (84) in which a refrigerant recovery solenoid valve (86) controlled to open operation is installed, and is introduced into the liquid refrigerant circulation passage (7b) of the plate heat exchanger (7) through the second liquid refrigerant transfer line (52) and the circulation operation is repeated.

Next, the following explains when the refrigeration cycle of the refrigerator is operated in defrost mode.

When the refrigeration cycle of the refrigerator is in operation, as shown in Fig. 2, the solenoid valve (10a) for removing frost is operated in the off state, while the solenoid valve (10b) for delaying frost deposition is operated in the on state. Then, the solenoid valves installed in various places of the refrigerant circulation line (1) of the refrigeration cycle for circulating and supplying refrigerant to each of the major components must be controlled by a control means that selectively operates on (open) and off (close).

For example, the solenoid valve (53) installed in the first liquid refrigerant transfer line (51) connecting the gas refrigerant inlet (71) of the mist refrigerant circulation passage (7a) installed in the receiver (4) and the plate heat exchanger (7), the solenoid valve (77) installed in the refrigerant supply line (76) connecting the other side refrigerant inlet (14) of the four-way solenoid valve (10a) for removing frost and the main refrigerant inlet (11) of the four-way solenoid valve (10b) for delaying frost formation, and the solenoid valve (87) for refrigerant recovery installed in the refrigerant recovery extension line (85) to store the refrigerant recovered through the refrigerant recovery line (83) in the receiver (4) are controlled to be in the on (open) operating state, while the second liquid refrigerant transfer line (52) connected to the second discharge port (43) of the receiver (4) and The refrigerant recovery electronic valve (86) installed in the bypass line (84) connecting the refrigerant recovery line (83) that recovers the refrigerant discharged after circulating through the evaporator (8) is adjusted to the off (closed) operating state.

When the above-mentioned solenoid valve (10a) for removing the refrigerant is turned off, the piston valve (15b) that is movably inserted and installed inside the cylinder valve body (15a) as shown in Fig. 7 moves to the left in the drawing, and accordingly, the main refrigerant inlet (11) and the other side refrigerant inlet (14) are connected by the other side connection passage (18), and the one side refrigerant inlet (12) and the central refrigerant inlet (13) are connected by the U-shaped connection passage (19).

As described above, when the refrigerator is operated in the defrosting operation with each of the electronic valves installed in various places of the refrigeration cycle of the refrigerator adjusted to the on or off operation as shown in Fig. 2, the high temperature and high pressure gaseous refrigerant compressed in the compressor (2) and discharged through the outlet line (21) flows into the main refrigerant inlet (11) of the four-way electronic valve (10a) for frost removal adjusted to the off operation state, is discharged through the other side connecting passage (18) to the other side refrigerant outlet (14), is transferred to the refrigerant supply line (76), passes through the open electronic valve (77), and is transferred to the evaporator (8) through the four-way electronic valve (10b) for frost deposition delay. At this time, the high temperature and high pressure gaseous refrigerant transferred to the evaporator (8) melts and removes the frost formed on the refrigerant circulation coil (not shown) installed in the pipe of the evaporator (8). It will be performed.

As described above, when the refrigeration device is operated in the defrost operation, the evaporator (8) operates as a condenser, and the high-temperature, high-pressure gaseous refrigerant flowing into the evaporator (8) operating as a condenser is condensed and liquefied through heat exchange with the heat exchange medium in the room (the space where the evaporator is installed) to become a liquid refrigerant at room temperature and transferred to the refrigerant recovery line (83). At this time, the refrigerant recovery solenoid valve (86) installed in the bypass line (84) is adjusted to the off (closed) state, so the liquid refrigerant at room temperature transferred to the refrigerant recovery line (83) is not transferred to the bypass line (84) but is transferred to the refrigerant recovery extension line (85) in which the refrigerant recovery solenoid valve (87) is adjusted to the on (open) state and is then transferred to the receiver (4) through the recovery port (44) of the receiver (4) and stored, while the first and second refrigerant recovery lines (4) are The liquid refrigerant discharged through the discharge port (42)(43) and transferred to the first liquid refrigerant transfer line (51) and the second liquid refrigerant transfer line (52), respectively, is transferred to the mist refrigerant circulation passage (7a) and the liquid refrigerant circulation passage (7b) installed in parallel to the plate heat exchanger (7).

The liquid refrigerant transferred to the first liquid transfer line (51) is rapidly expanded into a refrigerant in a fog state through the expansion valve (6) and flows into the gas refrigerant inlet (71) of the fog refrigerant circulation passage (7a) installed in the plate heat exchanger (7) and circulates through the fog refrigerant circulation passage (7a), while the liquid refrigerant transferred to the second liquid refrigerant transfer line (52) is transferred by the pumping operation of the refrigerant pump (5) and flows into the liquid refrigerant inlet (73) of the liquid refrigerant circulation passage (7b) installed in the plate heat exchanger (7) and circulates. The fog refrigerant and the liquid refrigerant circulating through the fog refrigerant circulation passage (7a) and the liquid refrigerant circulation passage (7b) installed in the plate heat exchanger (7) are separately transferred through the fog refrigerant circulation passage (7a) and the liquid refrigerant circulation passage (7b). The refrigerant in the fog state circulating through the fog refrigerant circulation passage (7a) evaporates into a gaseous state through a heat exchange action that takes heat from the liquid refrigerant circulating through the liquid refrigerant circulation passage (7b), is discharged through the gas refrigerant outlet (72), and is introduced into the compressor (2) through the inlet line (22) of the compressor (2) and compressed, repeating the operation. The liquid refrigerant circulating through the liquid refrigerant circulation passage (7b) is cooled through a heat exchange action that takes heat from the fog refrigerant circulating through the fog refrigerant circulation passage (7a), is discharged through the liquid refrigerant outlet (74), and is transferred to the cooling refrigerant transfer line (75), and is introduced into the central refrigerant inlet (13) of the four-way solenoid valve (10a) for frost removal, and is discharged and transferred to the refrigerant inlet (12) on one side through the U-shaped connecting passage (19), and is discharged and transferred through the inlet line (31) of the condenser (3). It flows into the condenser (3), and at this time, the condenser (3) operates as an evaporator, so it is condensed and liquefied into a liquid refrigerant at room temperature through heat exchange with a heat exchange medium outside (the space where the condenser is installed), and the operation of flowing into the receiver (4) through the inlet (41) of the receiver (4) and storing it is repeated.

And, the refrigeration device of the present invention can be configured in another embodiment in which a liquid separator (9) is inserted and installed inside the receiver (4) as illustrated in FIG. 3, and the refrigeration device of this other embodiment causes the gaseous refrigerant discharged through the gas refrigerant outlet (72) of the mist refrigerant circulation passage (7a) of the plate heat exchanger (7) to flow into the inlet (91) of the liquid separator (9) inserted and installed inside the receiver (4) through the gas refrigerant suction line (93), and while the gaseous refrigerant flowing into the inlet (91) of the liquid separator (9) is transferred to the outlet (92), the refrigerant that has not been evaporated into a gaseous state is evaporated through the heat exchange action with the liquid refrigerant at room temperature stored in the receiver (4), so that the evaporated gaseous refrigerant is discharged through the outlet (92) to the gas refrigerant discharge line (94) and flows into the compressor (2) through the inlet line (22) of the compressor (2), so that the refrigerant that has not been evaporated in the compressor (2) is not evaporated. By ensuring that no refrigerant other than the one supplied is ever introduced, it is possible to prevent and block in advance the cause of compressor (2) failure due to liquid compression.

As described above, the refrigeration device of the present invention operates in a configuration in which, during normal operation, the high temperature and high pressure gaseous refrigerant compressed at high temperature and high pressure by the compressor (2) and discharged through the outlet line (21) is transferred to the condenser (3), and, during defrosting operation of the refrigeration device, the high temperature and high pressure gaseous refrigerant discharged from the compressor (2) is transferred to the evaporator (8), thereby having the high temperature and high pressure gaseous refrigerant transferred to the evaporator (8) and circulated, thereby having the effect of melting and quickly removing frost formed on the refrigerant circulation coil (not shown) installed in the evaporator (8). In addition, the present invention has a simple configuration in which a four-way solenoid valve (10a) for removing frost is added and connected to the outlet line (21) of the compressor (2), so that the evaporator (8) installed in the existing refrigeration device can be used without structural modification, thereby having the effect of allowing a defrosting device to be provided in the refrigeration device at a low cost.

As described above, the present invention is not limited to the specific preferred embodiments described above, and anyone having ordinary skill in the art to which the present invention pertains may make various modifications without departing from the gist of the present invention claimed in the claims, and such modifications are within the scope of the claims.

Description of the sign

1: Refrigerant circulation line

10a: Four-way solenoid valve for removing the penis 10b: Four-way solenoid valve for delaying the penis implantation

11: Main refrigerant inlet 12: One-side refrigerant inlet

13: Central refrigerant inlet 14: Other side refrigerant inlet

15a: Cylinder valve body 15b: Piston valve

15d: Operating part 15c: Electronic valve body

16a: One side refrigerant inlet 16b: Other side refrigerant inlet

17: One-side connecting passage 18: Other-side connecting passage

19: U-shaped connecting passage

2 : Compressor

21,22: Entrance line and exit line

3: Condenser

31,32: Entrance line and exit line

4: Sap collector

41: Inlet 42,43: First and second outlets

44 : Recovery area

5: Refrigerant pump

51: First liquid refrigerant transfer line 52: Second liquid refrigerant transfer line

53 : Electronic valve

6: Expansion valve

7: Plate heat exchanger

7a: Fog refrigerant circulation path 7b: Liquid refrigerant circulation path

71: Gas refrigerant inlet 72: Gas refrigerant outlet

73: Liquid refrigerant inlet 74: Liquid refrigerant outlet

75: Cooling refrigerant transfer line 76: Refrigerant supply line

77 : Electronic valve

8: Evaporator

81,82: Inlet and outlet 83: Refrigerant recovery line

84: Bypass line 85: Refrigerant recovery extension line

86: Electronic valve for refrigerant recovery 87: Electronic valve for refrigerant recovery

9: Liquid separator

91,92 : Entrance and Exit

93: Gas refrigerant suction line 94: Gas refrigerant discharge line

Claims (9)

1. In a refrigeration device comprising a refrigeration cycle, which comprises a compressor (2) provided in the middle of a refrigerant circulation line (1), a condenser (3) for condensing and liquefying high-temperature, high-pressure gaseous refrigerant compressed and discharged from the compressor, a receiver (4) for storing the liquid refrigerant at room temperature condensed and liquefied from the condenser, an expansion valve (6) for rapidly expanding the liquid refrigerant discharged from the receiver, and an evaporator (8) for cooling or cooling the room to a set temperature through heat exchange with a heat exchange medium inside the room,

   It is configured to include a plate heat exchanger (7) having a mist refrigerant circulation passage (7a) in which mist refrigerant rapidly expanded in an expansion valve (6) formed in a first liquid refrigerant discharge line (51) connected to a first discharge port (42) through which liquid refrigerant stored in the above receiver (4) is discharged, and a liquid refrigerant circulation passage (7b) in which liquid refrigerant supplied by the pumping operation of a refrigerant pump (5) installed in a second liquid refrigerant transfer line (52) connected to a second discharge port (43) of the above receiver (4) is circulated.

   An evaporator defrosting device for a refrigerating device, characterized in that it further includes a four-way solenoid valve (10a) for defrosting, which is installed between the compressor (2) and the condenser (3) and is configured to supply high-temperature, high-pressure gaseous refrigerant discharged through the outlet line (21) of the compressor (2) by selecting either the condenser (3) or the evaporator (8).
2. In the first paragraph,

   The above-mentioned four-way solenoid valve (10a) for removing the frost is connected to the outlet line (21) of the compressor (2) so that the high temperature and high pressure gaseous refrigerant discharged from the compressor flows in, and is characterized in that it is configured to have a main refrigerant inlet (11) connected to the outlet line (21) of the compressor (2), a one-side refrigerant inlet (12) for supplying the gaseous refrigerant flowing in through the main refrigerant inlet to the condenser (3), a central refrigerant inlet (13) connected to a cooling refrigerant transfer line (75) for transferring the cooled liquid refrigerant discharged through the liquid refrigerant outlet (74) of the liquid refrigerant circulation passage (7b) installed in parallel to the plate heat exchanger (7), and the other-side refrigerant inlet (14) connected to a refrigerant supply line (76) for transferring the cooling refrigerant flowing in through the central refrigerant inlet to the evaporator (8).
3. In the first paragraph,

   The above-mentioned four-way solenoid valve (10a) for removing the temperature is configured so that when the above-mentioned temperature-high pressure gaseous refrigerant discharged through the outlet line (21) of the compressor (2) when the above-mentioned temperature-removal valve (10a) is operated on (on: open), the high temperature-high pressure gaseous refrigerant flows into the main refrigerant inlet (11) and is discharged to the condenser (3) side through the refrigerant inlet (12) on one side, while the liquid refrigerant flowing into the liquid refrigerant inlet (73) of the liquid refrigerant circulation passage (7b) of the above-mentioned plate heat exchanger (7) is cooled by heat exchange with the refrigerant in a fog state circulating through the fog refrigerant circulation passage (7a) while circulating through the liquid refrigerant circulation passage (7b), and is discharged through the liquid refrigerant outlet (74) to the cooling refrigerant transfer line (75), flows into the central refrigerant inlet (13), and is discharged through the refrigerant supply line (76) connected to the refrigerant inlet (14) on the other side, thereby discharging the liquid refrigerant of the above-mentioned plate heat exchanger (7). An evaporator defrosting device of a refrigerating device, characterized in that it is configured to supply cooled liquid refrigerant to an evaporator (8) while circulating through a circulation passage (7b).
4. In paragraph 1,

   The above-mentioned four-way solenoid valve (10a) for removing frost is configured so that when the above-mentioned frost removal valve is in the off (closed) operation, the high temperature and high pressure gaseous refrigerant discharged through the outlet line (21) of the compressor (2) flows into the main refrigerant inlet (11) and is supplied to the evaporator (8) through the refrigerant supply line (76) connected to the refrigerant outlet (14) on the other side, thereby removing frost formed on the evaporator (8), and the cooled liquid refrigerant that is cooled while circulating through the liquid refrigerant circulation passage (7b) of the plate heat exchanger (7) and discharged through the liquid refrigerant outlet (74) flows into the central refrigerant inlet (13) through the cooled refrigerant transfer line (76) and is supplied to the condenser (3) through the refrigerant outlet (12) on one side.
5. In paragraph 1,

   An evaporator defrosting device of a refrigeration device, characterized in that it further includes a four-way solenoid valve (10b) for frost deposition delay, which is installed between the plate heat exchanger (7) and the evaporator (8) and has a function of controlling the refrigerant flowing in through the main refrigerant inlet (11) to be supplied by selecting either the inlet (81) of the evaporator (8) or the outlet (82) of the evaporator (8).
6. In paragraph 1,

   A refrigerant recovery line (83) for recovering refrigerant that has performed heat exchange with an indoor heat exchange medium while circulating through the evaporator (8) and a second liquid refrigerant transfer line (52) for transferring liquid refrigerant discharged from a second discharge port (43) of a receiver (4) are connected to a bypass line (84) in which a refrigerant recovery electronic valve (86) is installed, and a refrigerant recovery extension line (85) in which a refrigerant recovery electronic valve (87) is installed is extended from the refrigerant recovery line (83) so that the refrigerant recovered from the evaporator (8) can be stored in the receiver (4), and the refrigerant recovery line (83) is connected to the recovery port (44) of the receiver (4) by the refrigerant recovery extension line (85).
7. In paragraph 1,

   An evaporator defrost device of a refrigeration device characterized in that a liquid separator (9) is inserted and installed inside the above-mentioned liquid receiver (4), and the inlet (91) of the liquid separator (9) is connected to the gaseous refrigerant outlet (72) of the fog refrigerant circulation passage (7a) by the gaseous refrigerant suction line (93) so that the gaseous refrigerant evaporated by the heat exchange action with the liquid refrigerant circulating in the liquid refrigerant circulation passage (7b) while circulating in the fog refrigerant circulation passage (7a) installed in parallel to the above-mentioned plate heat exchanger (7) can be introduced into the liquid separator (9), and a gaseous refrigerant discharge line (84) is connected between the outlet (92) of the liquid separator (9) and the inlet line (22) of the compressor (2) so that the gaseous refrigerant discharged from the liquid separator (9) can be introduced into the compressor (2).
8. In a method for defrosting an evaporator of a refrigeration device, which is composed of a refrigeration cycle, comprising a compressor (2) provided in the middle of a refrigerant circulation line (1), a condenser (3) for condensing and liquefying high-temperature, high-pressure gaseous refrigerant compressed and discharged from the compressor, a receiver (4) for storing the liquid refrigerant at room temperature condensed and liquefied from the condenser, an expansion valve (6) for rapidly expanding the liquid refrigerant discharged from the receiver, and an evaporator (8) for cooling or cooling the interior to a set temperature through heat exchange with an indoor heat exchange medium,

   It is configured so that the high temperature and high pressure gaseous refrigerant discharged from the compressor (2) can be selectively supplied to either the condenser (3) or the evaporator (8) by the on/off operation of the four-way solenoid valve (10a) for removing the frost, which is connected to the main refrigerant inlet (11) in the outlet line (21) of the compressor (2).

   When it is desired to remove the frost formed on the above evaporator (8), the four-way solenoid valve (10a) for removing the frost, which is connected to the main refrigerant inlet (11) at the outlet line (21) of the compressor (2), is operated in the off state so that the high temperature and high pressure gaseous refrigerant discharged from the compressor (2) flows into the main refrigerant inlet (11), is discharged through the other refrigerant outlet (14), and is supplied to the evaporator (8) through the refrigerant supply line (76), so that the high temperature and high pressure gaseous refrigerant supplied to and circulated in the evaporator (8) removes the frost formed on the evaporator (8).

   The gaseous refrigerant discharged through the gaseous refrigerant outlet (72) of the mist refrigerant circulation passage (7a) installed in the plate heat exchanger (7) is configured to repeat the operation of being introduced into the compressor (2), while the cooled refrigerant discharged through the liquid refrigerant outlet (74) of the liquid refrigerant circulation passage (7b) installed in the plate heat exchanger (7) is introduced through the cooled refrigerant transfer line (75) into the central refrigerant inlet (13) of the four-way solenoid valve (10a) for frost removal, discharged through the refrigerant inlet (12) on one side, supplied to the condenser (8), condensed and liquefied through heat exchange with an external heat exchange medium, temporarily stored in the receiver (4), and then transferred to the mist refrigerant circulation passage (7a) and the liquid refrigerant circulation passage (7b) installed in the plate heat exchanger (7) through the first and second liquid refrigerant transfer lines (51) and (52). A method for defrosting an evaporator of a refrigerating device, characterized in that it is configured to repeat a circulating operation supplied to each.
9. In Article 8,

   During normal operation of the above refrigeration device, the refrigerant recovery electronic valve (86) installed in the bypass line (84) connecting the second liquid refrigerant transfer line (52) connected to the second discharge port (43) of the receiver (4) and the refrigerant recovery line (83) for recovering the refrigerant discharged while circulating through the evaporator (8) and performing heat exchange is operated on, while the refrigerant recovery electronic valve (87) installed in the refrigerant recovery extension line (85) extended from the refrigerant recovery line (83) is operated off, so that the refrigerant discharged after circulating through the evaporator (8) and recovered through the refrigerant recovery line (83) is transferred to the bypass line (84) in which the refrigerant recovery electronic valve (86) is operated on, and transferred to the plate heat exchanger (7) side through the second liquid refrigerant transfer line (52).

   A method for defrosting an evaporator of a refrigerating device, characterized in that, when the above refrigerating device is in a defrosting operation, the refrigerant recovery electronic valve (86) installed in the bypass line (84) is operated in the off state, while the refrigerant recovery electronic valve (87) installed in the refrigerant recovery extension line (85) is operated in the on state, so that the refrigerant that circulates through the evaporator (8) and is discharged and recovered through the refrigerant recovery line (83) is transferred to the refrigerant recovery extension line (85) in which the refrigerant recovery electronic valve (87) opened by the on state is installed and stored in the receiver (4).

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