CN103314261A - Air conditioner - Google Patents

Abstract

The air conditioner of the present invention detects an abnormality of a valve mechanism. The indoor unit has an indoor heat exchanger installed inside, and a radiation panel installed on the surface thereof. The refrigerant circuit connecting the indoor unit and the outdoor unit has: a main flow, in which an outdoor electric valve (64), an outdoor heat exchanger and a compressor (60) are sequentially arranged; a first flow path; and a second flow path provided with a radiant panel. During heating operation, the first flow path connects a branch portion provided downstream of the compressor (60) in the main flow path and a confluence portion provided upstream of the outdoor electric valve (64). The second flow path connects the branch portion and the confluence portion in parallel to the first flow path. An indoor electric valve (23) is provided between the radiation panel and the confluence part in the second flow path. The air conditioner has an abnormality detection unit (73) for detecting abnormality in an indoor electric valve (23).

Description

air conditioner

technical field

The present invention relates to an air conditioner having an indoor unit having an indoor heat exchanger and a radiation panel.

Background technique

Regarding the air conditioner, there is known an air conditioner having an indoor unit connected to an outdoor unit through a refrigerant circuit, an indoor heat exchanger provided inside the indoor unit, and a radiation panel (for example, Refer to Patent Document 1). In the refrigerant circuit of the air conditioner disclosed in Patent Document 1, the indoor heat exchanger and the radiation panel are connected in parallel.

prior art literature

patent documents

Patent Document 1: Japanese Patent Application Laid-Open No. 5-280762

Contents of the invention

The problem to be solved by the invention

In the air conditioner described above, it is conceivable to provide a valve mechanism on the downstream side of the radiation panel during heating operation to adjust the flow rate of the refrigerant supplied to the radiation panel. In such an air conditioner, during the cooling operation, the valve mechanism is closed, and the refrigerant does not flow to the radiation panel, but the refrigerant flows only to the indoor heat exchanger. During the hot air heating operation, the valve mechanism is closed, and the refrigerant does not flow to the radiation panel, and the refrigerant only flows to the indoor heat exchanger. During the radiant heating operation, the valve mechanism is opened, and the refrigerant flows to both the radiant panel and the indoor heat exchanger.

In the refrigerant circuit described above, various problems arise when the valve mechanism is abnormal. For example, during cooling operation, when refrigerant leaks from a valve mechanism that should be closed, low-temperature refrigerant flows into the piping of the radiation panel, causing frost to form on the radiation panel. Also, during hot air heating operation, if refrigerant leaks from the valve mechanism that should be closed, high-temperature refrigerant passes through the piping of the radiant panel, and the temperature of the radiant panel rises, which should not be raised. Also, during the radiant heating operation, when the valve mechanism is closed or the opening degree is smaller than necessary, the temperature of the radiant panel, which should have been raised, does not rise. In a circuit in which the indoor heat exchanger and the radiant panel are connected in series, such a problem due to the abnormality of the valve mechanism also occurs.

An object of the present invention is to provide an air conditioner capable of detecting an abnormality in a valve mechanism.

means of solving problems

The air conditioner of the first invention is an air conditioner having a refrigerant circuit connecting an indoor unit and an outdoor unit, the indoor unit having: an indoor heat exchanger provided inside the indoor unit so as to face a fan; and a radiation panel provided on the surface of the indoor unit, the refrigerant circuit has: a valve mechanism for switching between a state in which the refrigerant flows to the radiation panel and a state in which the refrigerant does not flow to the radiation panel; and An abnormality detection unit detects an abnormality in the valve mechanism according to the temperature of the radiation panel.

In this air conditioner, the abnormality detection unit can detect that the valve mechanism is abnormal based on the temperature of the radiation panel. Therefore, problems such as frosting on the radiant panel during cooling operation and improper temperature of the radiant panel during air heating operation and radiant heating operation due to abnormality of the valve mechanism can be suppressed.

The air conditioner according to the second invention is the air conditioner according to the first invention, wherein the refrigerant circuit has: a main flow path in which a decompression mechanism, an outdoor heat exchanger, and a compressor are sequentially provided; a first flow path The indoor heat exchanger is provided in the first flow path. During the heating operation, the first flow path connects the branch portion provided on the downstream side of the compressor in the main flow path and the The confluence portion provided on the upstream side of the decompression mechanism is connected; and a second flow path in which the radiation panel is provided, the second flow path connects the branch portion and the confluence portion It is connected in parallel with the first flow path, and the valve mechanism is provided between the radiation panel and the junction in the refrigerant circuit.

In addition, "the valve mechanism is provided between the radiation panel and the confluence part in the refrigerant circuit" also includes the case where the valve mechanism is provided in the confluence part.

In this air conditioner, in an air conditioner in which the first flow path provided with the indoor heat exchanger and the second flow path provided with the radiation panel are connected in parallel, it is possible to detect an abnormality in the valve mechanism.

The air conditioner according to the third invention is the air conditioner according to the first or second invention, wherein the refrigerant flows to the radiation panel when the valve mechanism is switched to a state where the refrigerant does not flow to the radiation panel. Next, the abnormality detection unit detects that an abnormality has occurred in the valve mechanism.

In this air conditioner, when the refrigerant flows to the radiation panel while the valve mechanism is switched so that the refrigerant does not flow to the radiation panel, the abnormality detection means can detect that the valve mechanism is abnormal.

The air conditioner of the fourth invention is the air conditioner according to any one of the first to third inventions, the air conditioner has: an indoor heat exchange temperature sensor provided in the indoor heat exchanger; a sensor provided between the radiation portion of the radiation panel and the valve mechanism, the abnormality detection unit based on the temperature detected by the panel temperature sensor and the temperature detected by the indoor heat exchange temperature sensor, Detecting abnormalities in the valve mechanism.

In this air conditioner, the temperature detected by the panel temperature sensor and the temperature detected by the indoor heat exchange temperature sensor can be compared to detect the open/close state of the valve mechanism. Therefore, when it is detected that the valve mechanism is opened and the refrigerant flows to the radiant panel when the valve mechanism should be in a state where the refrigerant does not flow to the radiant panel, or when the valve mechanism should be in a state where the refrigerant flows to the radiant panel When it is detected that the valve mechanism is closed and the refrigerant does not flow to the radiation panel in the normal state, it can be detected that an abnormality has occurred in the valve mechanism.

The air conditioner according to the fifth invention is the air conditioner according to the fourth invention, wherein when the pressure in the indoor heat exchanger is equal to or lower than a predetermined value during cooling operation, the abnormality detecting means detects that the valve mechanism An exception was raised.

In this air conditioner, during cooling operation, the difference between the indoor temperature and the temperature detected by the indoor heat exchange temperature sensor is relatively small under the condition that the pressure (low pressure) in the indoor heat exchanger does not drop sufficiently. In this case, even when the valve mechanism is normally closed and the refrigerant does not flow to the radiation panel, the temperature detected by the panel temperature sensor is relatively close to the temperature detected by the indoor heat exchange temperature sensor. Therefore, although there is no abnormality in the valve mechanism, it may be erroneously detected that an abnormality occurs in the valve mechanism and the refrigerant flows to the radiation panel. Therefore, erroneous detection of an abnormality in the valve mechanism can be suppressed by eliminating such a case.

The air conditioner according to the sixth invention is the air conditioner according to the fourth or fifth invention, the air conditioner further includes an indoor temperature sensor for detecting indoor temperature, and the temperature detected by the indoor temperature sensor and the temperature detected by the indoor air conditioner are equal to each other. The abnormality detecting means detects that an abnormality has occurred in the valve mechanism when the temperature difference detected by the heat exchange temperature sensor is equal to or greater than a predetermined value.

In this air conditioner, erroneous detection of an abnormality in the valve mechanism can be suppressed by excluding the case where the difference between the temperature detected by the indoor temperature sensor and the temperature detected by the indoor heat exchange temperature sensor is relatively small.

Invention effect

As described above, according to the present invention, the following effects can be obtained.

In the first invention, the abnormality detecting means can detect the abnormality of the valve mechanism based on the temperature of the radiation panel. Therefore, problems such as frosting on the radiant panel during cooling operation and improper temperature of the radiant panel during air heating operation and radiant heating operation due to abnormality of the valve mechanism can be suppressed.

In the second invention, in the air conditioner in which the first flow path provided with the indoor heat exchanger and the second flow path provided with the radiation panel are connected in parallel, it is possible to detect that an abnormality has occurred in the valve mechanism.

In the third invention, when the refrigerant flows to the radiation panel while the valve mechanism is switched so that the refrigerant does not flow to the radiation panel, the abnormality detection means can detect that the valve mechanism is abnormal.

In the fourth invention, the temperature detected by the panel temperature sensor and the temperature detected by the indoor heat exchange temperature sensor can be compared to detect the open/close state of the valve mechanism. Therefore, when it is detected that the valve mechanism is opened and the refrigerant flows to the radiant panel when the valve mechanism should be in a state where the refrigerant does not flow to the radiant panel, or when the valve mechanism should be in a state where the refrigerant flows to the radiant panel When it is detected that the valve mechanism is closed and the refrigerant does not flow to the radiation panel in the normal state, it can be detected that an abnormality has occurred in the valve mechanism.

In the fifth invention, during cooling operation, the difference between the indoor temperature and the temperature detected by the indoor heat exchange temperature sensor is relatively small under the condition that the pressure (low pressure) in the indoor heat exchanger does not drop sufficiently. In this case, even when the valve mechanism is normally closed and the refrigerant does not flow to the radiation panel, the temperature detected by the panel temperature sensor is relatively close to the temperature detected by the indoor heat exchange temperature sensor. Therefore, although there is no abnormality in the valve mechanism, it may be erroneously detected that an abnormality occurs in the valve mechanism and the refrigerant flows to the radiation panel. Therefore, erroneous detection of an abnormality in the valve mechanism can be suppressed by eliminating such a case.

In the sixth invention, erroneous detection of abnormality of the valve mechanism can be suppressed by excluding the case where the difference between the temperature detected by the indoor temperature sensor and the temperature detected by the indoor heat exchange temperature sensor is relatively small.

Description of drawings

FIG. 1 is a circuit diagram showing a schematic configuration of an air conditioner according to an embodiment of the present invention, and is a diagram showing flows of refrigerant during cooling operation and heating operation.

Fig. 2 is a circuit diagram showing an outline of the configuration of the air conditioner according to the embodiment of the present invention, and is a diagram showing the flow of refrigerant during radiant heating operation.

Fig. 3 is a perspective view of the indoor unit shown in Figs. 1 and 2 .

Fig. 4 is a sectional view along line IV-IV of the indoor unit shown in Fig. 3 .

Fig. 5 is a block diagram showing an outline configuration of a control unit that controls the air conditioner.

6 is a graph for explaining conditions for preventing erroneous detection when the abnormality detection unit shown in FIG. 5 detects an abnormality during cooling operation.

Fig. 7 is a graph for explaining conditions when an abnormality detection unit shown in Fig. 5 detects an abnormality during air heating operation.

FIG. 8 is a graph for explaining conditions when an abnormality detection unit shown in FIG. 5 detects an abnormality during radiant heating operation.

FIG. 9 is a flowchart showing the procedure of abnormality detection processing during cooling operation performed by the abnormality detection unit shown in FIG. 5 .

Fig. 10 is a flowchart showing the procedure of an abnormality detection process performed by the abnormality detection unit shown in Fig. 5 during the hot air heating operation.

FIG. 11 is a flowchart showing the procedure of abnormality detection processing during radiant heating operation performed by the abnormality detection unit shown in FIG. 5 .

Fig. 12 is a circuit diagram showing a schematic configuration of an air conditioner according to a modified example of the present embodiment.

Detailed ways

Next, an embodiment of the air conditioner 1 of the present invention will be described.

<Overall structure of the air conditioner 1>

As shown in FIGS. 1 and 2 , an air conditioner 1 according to the present embodiment includes an indoor unit 2 installed indoors, an outdoor unit 6 installed outdoors, and a remote controller 9 (see FIG. 5 ). The indoor unit 2 has an indoor heat exchanger 20 provided to face the indoor fan 21, a radiation panel 30, an indoor electric valve 23, and an indoor temperature sensor 24 for detecting indoor air temperature. In addition, the outdoor unit 6 includes a compressor 60 , a four-way switching valve 61 , an outdoor heat exchanger 62 , an outdoor fan 63 arranged near the outdoor heat exchanger 62 , and an outdoor electric valve 64 (decompression mechanism).

In addition, the air conditioner 1 has a refrigerant circuit 10 that connects the indoor unit 2 and the outdoor unit 6 . The refrigerant circuit 10 has a main flow path 11 in which an outdoor electric valve 64 , an outdoor heat exchanger 62 , and a compressor 60 are provided in this order. The suction-side piping and the discharge-side piping of the compressor 60 are connected to a four-way switching valve 61 . During heating operation (as will be described in detail later, when the refrigerant flows in the direction indicated by the solid arrow in FIG. 1 in the refrigerant circuit 10 ), downstream of the compressor 60 in the main passage 11 A branch portion 10 a is provided at a side portion, and a confluence portion 10 b is provided at an upstream portion of the outdoor electric valve 64 . In addition, the refrigerant circuit 10 further includes: a first flow path 12 in which the indoor heat exchanger 20 is provided, and the first flow path 12 connects the branch portion 10a and the confluence portion 10b; 2. A flow path 13 in which the radiation panel 30 is provided, and the second flow path 13 connects the branch portion 10a and the confluence portion 10b to the first flow path 12 in parallel.

An indoor electric valve (valve mechanism) 23 is provided between the radiation panel 30 and the confluence portion 10 b in the second flow path 13 . Furthermore, a panel input temperature sensor 25 and a panel output temperature sensor 26 are provided on both sides of the radiation panel 30 in the second flow path 13 . More specifically, the panel input temperature sensor 25 is provided in the piping of the radiation panel 30 on the upstream side of the radiation portion 35 (see FIG. 4 ) described later in the heating operation. The panel output temperature sensor 26 is provided in the piping of the radiant panel 30 on the downstream side of the radiating portion 35 and on the upstream side of the indoor electric valve 23 during heating operation.

In addition, an accumulator 65 is provided between the suction side of the compressor 60 in the refrigerant circuit 10 and the four-way switching valve 61, and an accumulator 65 is provided between the discharge side of the compressor 60 in the refrigerant circuit 10 and the four-way switching valve 61. A discharge temperature sensor 66 is provided therebetween. In addition, an outdoor heat exchange temperature sensor 68 is provided in the outdoor heat exchanger 62 .

The indoor heat exchanger 20 has piping constituting a part of the refrigerant circuit 10 and is provided with an indoor heat exchange temperature sensor 27 . The indoor heat exchanger 20 is arranged on the windward side of the indoor fan 21 . The air heated or cooled by the heat exchange with the indoor heat exchanger 20 is turned into hot air or cold air by the indoor fan 21 and blown out into the room, thereby performing hot air heating or cooling.

The radiation panel 30 is arranged on the front side of the indoor unit 2 and has a panel piping 36 which is a piping constituting a part of the refrigerant circuit 10 . The heat of the refrigerant flowing through the panel piping 36 is radiated into the room, whereby radiant heating is performed. The indoor electric valve 23 is provided to adjust the flow rate of refrigerant supplied to the radiant panel 30 . By controlling the opening and closing of the indoor electric valve 23 , it is possible to switch between a state in which the refrigerant flows to the panel piping 36 of the radiation panel 30 and a state in which the refrigerant does not flow to the panel piping 36 of the radiation panel 30 .

The air conditioner 1 of the present embodiment is capable of cooling operation, hot air heating operation, and radiant heating operation. The cooling operation is to make the refrigerant not flow to the radiation panel 30, but to make the refrigerant flow to the indoor heat exchanger 20 for cooling, and the hot air heating operation is to make the refrigerant not flow to the radiation panel 30, but to make the refrigerant flow to the indoor heat exchange 20 to carry out the operation of hot air heating. The radiant heating operation is an operation in which the refrigerant flows to the indoor heat exchanger 20 to perform hot air heating, and at the same time flows the refrigerant to the radiant panels 30 to perform radiant heating.

The flow of the refrigerant in the refrigerant circuit 10 during various operations will be described with reference to FIGS. 1 and 2 .

During the cooling operation, the indoor electric valve 23 is closed, and the four-way switching valve 61 is switched to the state shown by the dotted line in FIG. 1 . Therefore, as indicated by the dotted arrow in FIG. 1 , the high-temperature and high-pressure refrigerant discharged from the compressor 60 flows into the outdoor heat exchanger 62 through the four-way switching valve 61 . Then, the refrigerant condensed in the outdoor heat exchanger 62 is decompressed through the outdoor electric valve 64 and then flows into the indoor heat exchanger 20 . And, the refrigerant evaporated in the indoor heat exchanger 20 flows into the compressor 60 through the four-way switching valve 61 and the accumulator 65 . In addition, the closed indoor electric valve 23 prevents the refrigerant decompressed through the outdoor electric valve 64 from flowing to the side of the second flow path 13 closer to the radiation panel 30 than the indoor electric valve 23 .

During the hot air heating operation, the indoor electric valve 23 is closed, and the four-way switching valve 61 is switched to the state shown by the solid line in FIG. 1 . Therefore, as shown by the solid arrow in FIG. 1 , the high-temperature and high-pressure refrigerant discharged from the compressor 60 flows into the indoor heat exchanger 20 through the four-way switching valve 61 . Then, the refrigerant condensed in the indoor heat exchanger 20 is decompressed through the outdoor electric valve 64 and then flows into the outdoor heat exchanger 62 . And, the refrigerant evaporated in the outdoor heat exchanger 62 flows into the compressor 60 through the four-way switching valve 61 and the accumulator 65 . In addition, the refrigerant discharged from the compressor 60 does not flow to the side of the second flow path 13 that is closer to the junction portion 10b than the indoor electric valve 23 due to the closed indoor electric valve 23 . That is, in the second flow path 13 , the refrigerant stagnates on the upstream side of the indoor electric valve 23 .

During the radiant heating operation, the indoor electric valve 23 is opened, and the four-way switching valve 61 is switched to the state shown by the solid line in FIG. 2 . Therefore, as shown by the solid arrow in FIG. 2 , the high-temperature and high-pressure refrigerant discharged from the compressor 60 flows into the indoor heat exchanger 20 and the radiation panel 30 through the four-way switching valve 61 . And, the refrigerant condensed in the indoor heat exchanger 20 and the radiation panel 30 is decompressed through the outdoor electric valve 64 and then flows into the outdoor heat exchanger 62 . And, the refrigerant evaporated in the outdoor heat exchanger 62 flows into the compressor 60 through the four-way switching valve 61 and the accumulator 65 .

<Structure of indoor unit 2>

Next, the configuration of the indoor unit 2 will be described.

As shown in FIG. 3 , the indoor unit 2 according to the present embodiment has a rectangular parallelepiped shape as a whole, and is installed indoors near the floor surface. In the present embodiment, the indoor unit 2 is attached to the wall surface in a state of floating about 10 cm from the floor surface. In addition, in the description below, the direction protruding from the wall on which the indoor unit 2 is installed is referred to as "front", and the opposite direction is referred to as "rear". In addition, the left-right direction shown in FIG. 3 is simply called "left-right direction", and the up-down direction is simply called "up-down direction".

As shown in FIG. 4 , the indoor unit 2 mainly includes a casing 4, and internal devices such as an indoor fan 21 housed in the casing 4, an indoor heat exchanger 20, an air outlet unit 46, an electrical component unit 47, and a front panel. grille42. As will be described in detail later, the casing 4 has a main suction port 4a formed on the lower wall thereof, and auxiliary suction ports 4b, 4c formed on the front wall thereof. In addition, an air outlet 4 d is formed on the upper wall of the casing 4 . In the indoor unit 2, by driving the indoor fan 2, the air located near the floor surface is sucked in from the main suction port 4a, and the air is also sucked in from the auxiliary suction ports 4b and 4c. In addition, in the indoor heat exchanger 20, conditioning processing such as heating or cooling is performed on the sucked air. Then, the tempered air is blown out from the air outlet 4d, and it is returned to the room.

The casing 4 is composed of a main body frame 41 , a blowout mask 51 , a radiation panel 30 , and an opening and closing panel 52 . In addition, the blower mask 51 has the front panel part 51a, and the radiation panel 30 has the radiation board 31 as mentioned later. The front panel 51 a of the outlet mask 51 , the radiation panel 31 of the radiation panel 30 , and the opening and closing panel 52 are arranged so as to form a plane on the front surface of the housing 4 , thereby constituting the front panel 5 . As shown in Figure 3, in the upper right end portion of front panel 5, promptly blows out the right end portion of the front panel portion 51a of mouth mask 51, be provided with power button 48 and the light-emitting display portion 49 that shows operating condition.

The main body frame 41 is installed on the wall surface, and supports the above-mentioned various internal devices. And, the front grill 42 , the outlet mask 51 , the radiation panel 30 and the opening and closing panel 52 are attached to the front surface of the main body frame 41 in a state of supporting internal equipment. The blow-out mask 51 is attached to the upper end of the main body frame 41, and the blow-out port 4d which is the rectangular-shaped opening long in the left-right direction is formed in the upper wall. The radiation panel 30 is attached below the outlet mask 51 , and the opening and closing panel 52 is attached below the radiation panel 30 . Between the lower front end of the main body frame 41 and the lower end of the opening and closing panel 52 is a main suction port 4a which is a long opening in the left-right direction.

Here, each internal device accommodated in the casing 4 will be described.

The indoor fan 21 is arranged slightly above the central portion in the height direction of the housing 4 so that its axial direction is along the left-right direction. The indoor fan 21 sucks in air from the lower front and blows it out to the upper rear.

The indoor heat exchanger 20 is arranged substantially parallel to the front panel 5, and consists of the front heat exchanger 20a facing the back of the front panel 5, and the front heat exchanger 20a inclined upward as it approaches the back from the vicinity of the lower end of the front heat exchanger 20a. The rear heat exchanger 20b is constituted. The front heat exchanger 20 a is disposed in front of the indoor fan 21 , and its upper half faces the indoor fan 21 . The rear heat exchanger 20b is disposed below the indoor fan 21 and faces the indoor fan 21 . That is, the indoor heat exchanger 20 has a substantially V-shape as a whole, and is arranged to surround the front and the bottom of the indoor fan 21 .

Below the indoor heat exchanger 20, a drain pan 22 extending in the left-right direction is arranged. Furthermore, an electrical component unit 47 is disposed below the drain pan 22 .

The air outlet unit 46 is disposed above the indoor fan 21 and guides the air blown out from the indoor fan 21 to the air outlet 4d formed on the upper wall of the casing 4 . The outlet unit 46 has the horizontal blade 46a arrange|positioned near the outlet 4d. The horizontal blade 46a changes the vertical wind direction of the airflow blown out from the air outlet 4d, and opens and closes the air outlet 4d.

The front grille 42 is attached to the main body frame 41 so as to cover the main body frame 41 as described above, and the indoor heat exchanger 20 , the indoor fan 21 , the air outlet unit 46 , and the electrical component unit 47 are attached to the main body frame 41 at this time. and other internal equipment. More specifically, the front grille 42 is attached to the main body frame 41 so as to cover from the substantially central portion in the vertical direction of the front heat exchanger 20 a to the lower end of the main body frame 41 . The front grill 42 has a filter holder 42a and a suction inlet grill 42b arranged at the main suction inlet 4a.

The lower filter 43 and the upper filter 44 are attached to the filter holding part 42a. As shown in FIG. 4 , the lower filter 43 held by the filter holder 42 a extends downward from a substantially central portion in the vertical direction of the front heat exchanger 20 a, and its lower end portion is inclined obliquely rearward. The lower end of the lower filter 43 is located near the rear edge of the main suction port 4a. In addition, the upper filter 44 extends upward from a substantially central portion in the vertical direction of the front heat exchanger 20a. The space between the front heat exchanger 20 a and the front panel 5 is divided in the front-rear direction by these lower filter 43 and upper filter 44 .

The outlet mask 51 covers the outlet unit 46 . In addition, as described above, the blower port 4d is formed on the upper wall of the blower mask 51 . On the front surface of the outlet mask 51, a front panel portion 51a is provided. The front panel portion 51a has a rectangular shape long in the left-right direction.

Radiation panel 30 has a substantially rectangular shape that is long left and right. The radiation panel 30 is mainly composed of an aluminum radiation panel 31 and a resin heat shield 32 attached to the back surface of the radiation panel 31 . The radiation plate 31 is located below the front panel part 51a of the outlet mask 51. As shown in FIG. As shown in FIG. 4 , panel piping 36 , which is a part of piping constituting refrigerant circuit 10 , is attached to the back surface of radiation plate 31 . In addition, in the radiation panel 30 , a portion where the radiation plate 31 and the panel piping 36 are in contact is the radiation portion 35 .

The opening and closing panel 52 is detachably installed under the radiation panel 31 of the radiation panel 30 . The opening and closing panel 52 has a rectangular shape long in the left-right direction. As shown in FIG. 4 , the vertical position of the upper end of the openable panel 52 is substantially the same as that of the upper end of the front grille 42 . As described above, the lower end of the opening and closing panel 52 constitutes a part of the main suction port 4a. Therefore, the lower filter 43 and the upper filter 44 attached to the filter holding part 42 a of the front grill 42 can be attached and detached by removing the opening and closing panel 52 to expose the front grill 42 .

<Remote control 9>

The user uses the remote controller 9 to start/stop the operation of the air conditioner 1 configured as described above, set the operation mode, set the target temperature of the indoor temperature (indoor set temperature), and set the blown air volume. wait.

<Control Unit 7>

Next, the controller 7 for controlling the air conditioner 1 will be described with reference to FIG. 5 .

As shown in FIG. 5 , the control unit 7 has a storage unit 70 , an indoor electric valve control unit 72 , an abnormality detection unit 73 , an indoor fan control unit 74 , a compressor control unit 75 , and an outdoor electric valve control unit 76 .

Various operation settings related to the air conditioner 1 , control programs, data tables necessary for executing the control programs, and the like are stored in the storage unit 70 . The operation setting includes a method in which the user operates the remote control 9 such as a target temperature of the indoor temperature (indoor set temperature), and a method in which the air conditioner 1 is set in advance. In the air conditioner 1 of the present embodiment, the target temperature range of the radiation panel 30 is set in advance to a predetermined temperature range (for example, 50 to 55° C.). In addition, the target temperature range of the radiation panel 30 may be set according to the operation of the remote controller 9 .

The indoor electric valve control unit 72 controls the opening degree of the indoor electric valve 23 . During cooling operation or hot air heating operation, the indoor electric valve control unit 72 closes the indoor electric valve 23 . Furthermore, during the radiant heating operation, the indoor electric valve control unit 72 controls the opening degree of the indoor electric valve 23 according to the temperature of the radiant panel 30 . Specifically, according to the calculated values of the temperatures detected by the panel input temperature sensor 25 and the panel output temperature sensor 26, the surface temperature (predicted value) of the radiation panel 30 is calculated, and the opening degree of the indoor electric valve 23 is controlled so that the The predicted value of the surface temperature of the radiation panel 30 (hereinafter simply referred to as the radiation panel temperature) reaches the panel target temperature range (for example, 50° C. to 55° C.). Moreover, when the detection value of the panel input temperature sensor 25 is more than predetermined value (for example, 80 degreeC), the indoor electric valve 23 is closed.

The abnormality detection unit 73 detects that an abnormality occurs in the indoor electric valve 23 based on the temperature of the radiation panel 30 . That is, when the refrigerant leaks from the indoor electric valve 23 that should be closed during the cooling operation and the hot air heating operation, and the refrigerant flows to the panel piping 36 of the radiation panel 30, it is detected that the indoor electric valve 23 has generated a fault. abnormal. Furthermore, when the indoor electric valve 23 is completely closed and the refrigerant does not flow to the panel piping 36 of the radiant panel 30 during the radiant heating operation, it is detected that the indoor electric valve 23 is abnormal. Specifically, during cooling operation, the abnormality detection unit 73 detects the temperature detected by the indoor temperature sensor 24 (hereinafter simply referred to as the indoor temperature Ta) and the temperature detected by the panel output temperature sensor 26 (hereinafter referred to simply as the panel piping temperature TP). ), and the temperature detected by the indoor heat exchange temperature sensor 27 (hereinafter simply referred to as the indoor heat exchange temperature Te), to detect abnormalities in the indoor electric valve 23 . In addition, during hot air heating operation or radiant heating operation, abnormality of the indoor electric valve 23 is detected based on the panel piping temperature TP and the indoor heat exchange temperature Te.

During cooling operation, if an abnormality occurs in the indoor electric valve 23 and the refrigerant leaks from the indoor electric valve 23 that should be closed, the low-temperature refrigerant flowing into the second flow path 13 from the confluence portion 10 b flows downstream of the indoor electric valve 23 . side (radiant panel 30 side) piping. Therefore, the panel piping temperature TP detected by the panel output temperature sensor 26 drops to be equal to or lower than the indoor heat exchange temperature Te detected by the indoor heat exchange temperature sensor 27 provided in the indoor heat exchanger 20 for heat exchange. That is, the condition for detecting the abnormality of the indoor electric valve 23 by the abnormality detection unit 73 satisfies the following (Expression 1).

TP－Te≦0deg (Formula 1)

In addition, in this embodiment, only when the temperature of the refrigerant flowing out of the outdoor electric valve 64 is low enough and the radiation panel 30 may be frosted when the refrigerant flows into the piping inside the radiation panel 30 , it is detected as an indoor electric valve. Abnormality of valve 23. Therefore, the conditions for detecting the abnormality of the indoor electric valve 23 by the abnormality detection unit 73 must satisfy the following (Formula 2) and (Formula 3) in addition to the above-mentioned (Formula 1).

TP≦32°C (Formula 2)

Te≦32°C (Formula 3)

In addition, for example, the outdoor unit 6 is a multi-connection type outdoor unit that can be connected to a plurality of indoor units, and when a plurality of indoor units connected to the outdoor unit 6 are operating simultaneously, the pressure (low pressure) inside the indoor heat exchanger 20 ) sometimes cannot drop sufficiently. In this case, the indoor temperature Ta, the panel piping temperature TP, and the indoor heat exchange temperature Te are at substantially the same temperature, so that the above-mentioned (Formula 1) can be satisfied even if there is no abnormality in the indoor electric valve 23 . Therefore, in order to prevent such erroneous detection, in addition to the aforementioned (Formula 1) to (Formula 3), the following (Formula 4) is also satisfied as a condition for abnormality detection of the indoor electric valve 23 by the abnormality detection unit 73 .

Ta－Te≧5deg (Formula 4)

In addition, when the difference between the indoor temperature Ta and the indoor heat exchange temperature Te is less than 5 deg, even if the indoor electric valve 23 malfunctions and the refrigerant leaks, as long as the relative humidity is 80% or less, the radiant panel 30 will not be frosted. .

According to the above-mentioned (Formula 4), only the region (I) shown in FIG. 6 becomes a region in which abnormality of the indoor electric valve 23 can be detected. That is, in the region where the indoor heat exchange temperature Te is higher than the indoor temperature Ta (that is, Ta-Te<0deg), and it is not necessary to detect the abnormality of the indoor electric valve 23 (the region shown in (II) in the figure), and the indoor temperature In the region where the difference between Ta and the indoor heat exchange temperature Te is relatively small (that is, 0deg≦Ta-Te<5deg), and the abnormality of the indoor electric valve 23 may be erroneously detected (the region shown in (III) in the figure), no Abnormality detection of the indoor electric valve 23 is performed.

That is, during cooling operation, the indoor temperature Ta detected by the indoor temperature sensor 24, the panel piping temperature TP detected by the panel output temperature sensor 26, and the indoor heat exchange temperature Te detected by the indoor heat exchange temperature sensor 27 When all of the aforementioned (Expression 1) to (Expression 4) are satisfied, the abnormality detection unit 73 detects that the indoor electric valve 23 is abnormal.

During the hot air heating operation, if the indoor electric valve 23 is abnormal and the refrigerant leaks from the indoor electric valve 23 that should be closed, the high-temperature refrigerant flowing into the second flow path 13 from the branch portion 10a will flow through the piping of the radiation panel 30. and the indoor electric valve 23, and flow out from the second flow path 13. Therefore, the panel piping temperature TP detected by the panel output temperature sensor 26 rises to reach or exceed the indoor heat exchange temperature Te detected by the indoor heat exchange temperature sensor 27 provided in the indoor heat exchanger 20 for heat exchange. That is, the condition for detecting the abnormality of the indoor electric valve 23 by the abnormality detection unit 73 satisfies the following (Formula 5).

Te－TP≦0deg (Formula 5)

In addition, in the present embodiment, only when the temperature of the refrigerant discharged from the compressor 60 is relatively high and the radiation panel 30 reaches a certain high temperature when the refrigerant passes through the piping in the radiation panel 30 , the temperature is detected. It is an abnormality of the indoor electric valve 23. Therefore, the conditions for detecting the abnormality of the indoor electric valve 23 by the abnormality detection unit 73 must satisfy the following (Formula 6) and (Formula 7) in addition to the above-mentioned (Formula 5).

TP≧43°C (Formula 6)

Te≧43°C (Formula 7)

That is, considering the relationship between the surface temperature of the radiant panel 30 (hereinafter referred to simply as the panel temperature TP0) and the indoor heat exchange temperature Te, as shown in FIG. The above region (the region shown in (I) in the figure) is a region where abnormality of the indoor electric valve 23 can be detected. That is, in a region (the region shown in (II) in the figure) where the panel temperature TP0 is 40°C or higher and the indoor heat exchange temperature Te is lower than 43°C, which cannot occur in actual operation, and the panel temperature In the area where TP0 is lower than 40°C, where there is no need to detect abnormality of the indoor electric valve 23, and it is possible to detect an abnormality of the indoor electric valve 23 by mistake (the area shown in (III) in the figure), the indoor electric valve 23 is not checked. abnormal detection.

That is, during the hot air heating operation, the panel piping temperature TP detected by the panel output temperature sensor 26 and the indoor heat exchange temperature Te detected by the indoor heat exchange temperature sensor 27 all satisfy the above-mentioned (Formula 5) to ( In the case of expression 7), the abnormality detection unit 73 detects that the indoor electric valve 23 is abnormal.

During radiant heating operation, if an abnormality occurs in the indoor electric valve 23 and the indoor electric valve 23 is closed, the high-temperature refrigerant flowing into the second flow path 13 from the branch portion 10 a stays on the upstream side of the indoor electric valve 23 . (radiant panel 30 side) piping. Therefore, the panel piping temperature TP detected by the panel output temperature sensor 26 does not increase, and the difference between the indoor heat exchange temperature Te and the panel piping temperature TP increases. That is, the condition for detecting the abnormality of the indoor electric valve 23 by the abnormality detection unit 73 satisfies the following (Expression 8).

Te－TP≧35deg (Formula 8)

Also, when the indoor electric valve 23 is fully closed, the indoor temperature is 10°C, and the indoor heat exchange temperature is 55°C, the difference between the indoor heat exchange temperature Te and the panel piping temperature TP is 35 deg.

In addition, in this embodiment, even when the indoor electric valve 23 is closed, if the temperature of the radiation panel 30 rises to some extent, the abnormality of the indoor electric valve 23 is not detected, and only when the temperature of the radiation panel 30 is not expected In the case of rising, abnormality of the indoor electric valve 23 is detected. Therefore, the conditions for detecting the abnormality of the indoor electric valve 23 by the abnormality detection unit 73 must satisfy the following (Formula 9) and (Formula 10) in addition to the above-mentioned (Formula 8).

TP≦60°C (Formula 9)

Te≦60°C (Formula 10)

That is, considering the relationship between the panel temperature TP0 and the indoor heat exchange temperature Te, only the region (I) shown in FIG. 8 is a region where abnormality of the indoor electric valve 23 can be detected. That is, in the region where the panel temperature TP0 is higher than the indoor heat exchange temperature Te (that is, Te-TP0<0deg), which cannot occur in actual operation (the region shown in (II) in the figure), and the indoor heat The difference between the exchange temperature Te and the panel temperature TP0 is relatively small (that is, 0deg≦Te-TP0<35deg), and in the area where the abnormal detection of the indoor electric valve 23 cannot be performed (the area shown in (III) in the figure), the indoor electric valve is not operated. Abnormal detection of valve 23.

That is, during the radiant heating operation, all of the above-mentioned (Formula 8) to ( In the case of formula 10), the abnormality detection unit 73 detects that the indoor electric valve 23 is abnormal.

The indoor fan control unit 74 controls the rotation speed of the indoor fan 21 based on the operation mode set by the remote controller 9 , the indoor set temperature, the blown air volume, and the indoor temperature detected by the indoor temperature sensor 24 .

The compressor control unit 75 controls the operating frequency of the compressor 60 based on the indoor temperature, the set indoor temperature, the heat exchange temperature detected by the indoor heat exchange temperature sensor 27 , and the like.

The outdoor electric valve control unit 76 controls the opening degree of the outdoor electric valve 64 . Specifically, the opening degree of the outdoor electric valve 64 is controlled so that the temperature detected by the discharge temperature sensor 66 becomes the optimum temperature in the operating state. The optimum temperature is determined based on calculated values using the indoor heat exchange temperature, the outdoor heat exchange temperature, and the like.

<Abnormity Detection Process by Abnormality Detection Unit 73 >

Here, the procedure of the abnormality detection process which detects the abnormality of the indoor electric valve 23 by the abnormality detection part 73 is demonstrated.

During the cooling operation, first, as shown in FIG. Te (step S11). Then, it is determined whether or not the difference between the indoor temperature Ta and the indoor heat exchange temperature Te is 5 deg or more (step S12 ). And, when the difference between the indoor temperature Ta and the indoor heat exchange temperature Te is less than 5 deg (step S12: No), it may be wrongly detected that the indoor electric valve 23 is abnormal, so the next step is not entered, but returns to Step S11 above.

On the other hand, when the difference between the indoor temperature Ta and the indoor heat exchange temperature Te is 5 deg or more (step S12: Yes), it is determined whether the difference between the panel piping temperature TP and the indoor heat exchange temperature Te is 0 deg or less (step S13) . Here, when the difference between the panel piping temperature TP and the indoor heat exchange temperature Te is greater than 0 degrees (step S13: No), it is considered that the indoor electric valve 23 is normally closed and there is no refrigerant leakage, so it does not proceed to the next step. step, but returns to the above-mentioned step S11.

In addition, when the difference between the panel piping temperature TP and the indoor heat exchange temperature Te is 0 deg or less (step S13: Yes), it is considered that the refrigerant leaks from the indoor electric valve 23 that should be closed. Then, in step S14, it is determined whether or not the panel piping temperature TP is 32°C or lower, and in step S15, it is determined whether or not the indoor heat exchange temperature Te is 32°C or lower. When the panel piping temperature TP is greater than 32°C in step S14 (step S14: No), or the indoor heat exchange temperature Te is greater than 32°C in step S15 (step S15: No), it is considered that the radiant panel 30 will not produce Frosting, therefore, does not go to the next step, but returns to the above-mentioned step S11.

On the other hand, when the panel piping temperature TP is 32°C or lower in step S14 (step S14: Yes), and the indoor heat exchange temperature Te is 32°C or lower in step S15 (step S15: yes), it is detected that the indoor electric valve 23 An abnormality is generated (step S16).

During the hot air heating operation, first, as shown in FIG. 10 , the panel piping temperature TP detected by the panel output temperature sensor 26 and Te detected by the indoor heat exchange temperature sensor 27 are acquired (step S21 ). Then, it is determined whether or not the difference between the indoor heat exchange temperature Te and the panel piping temperature TP is 0 degrees or less (step S22 ). Here, when the difference between the indoor heat exchange temperature Te and the panel piping temperature TP is greater than 0 degrees (step S22: No), it is considered that the indoor electric valve 23 is normally closed and there is no refrigerant leakage, so the next step is not performed. step, but returns to the above-mentioned step S21.

In addition, when the difference between the indoor heat exchange temperature Te and the panel piping temperature TP is 0 deg or less (step S22: Yes), it is considered that the refrigerant leaks from the indoor electric valve 23 that should be closed. Then, in step S23, it is determined whether or not the panel piping temperature TP is 43° C. or higher, and in step S24 it is determined whether or not the indoor heat exchange temperature Te is 43° C. or higher. When the panel piping temperature TP is lower than 43°C in step S23 (step S23: No), or the indoor heat exchange temperature Te is lower than 43°C in step S24 (step S24: No), it is considered that the temperature of the radiation panel 30 is not high. How (the degree to which the abnormality detection of the indoor electric valve 23 is required) is raised, so the process returns to the above-mentioned step S21 without proceeding to the next step.

On the other hand, when the panel piping temperature TP is 43°C or higher in step S23 (step S23: Yes), and the indoor heat exchange temperature Te is 43°C or higher in step S24 (step S24: yes), it is detected that the indoor An abnormality occurs in the electric valve 23 (step S25).

During radiant heating operation, first, as shown in FIG. 11 , the panel piping temperature TP detected by the panel output temperature sensor 26 and Te detected by the indoor heat exchange temperature sensor 27 are acquired (step S31 ). Then, it is determined whether or not the difference between the indoor heat exchange temperature Te and the panel piping temperature TP is 35 deg or more (step S32 ). Here, when the difference between the indoor heat exchange temperature Te and the panel piping temperature TP is less than 35 deg (step S22: No), it is considered that the indoor electric valve 23 is opened, so it does not proceed to the next step, but returns to the above-mentioned Step S31.

In addition, when the difference between the indoor heat exchange temperature Te and the panel piping temperature TP is 35 deg or more (step S32: YES), it is considered that the indoor electric valve 23 that should be opened is closed. Then, in step S33, it is determined whether or not the panel piping temperature TP is 60°C or lower, and in step S34, it is determined whether or not the indoor heat exchange temperature Te is 60°C or lower. When the panel piping temperature TP is greater than 60°C in step S33 (step S33: No), or the indoor heat exchange temperature Te is greater than 60°C in step S34 (step S34: No), do not proceed to the next step, and It is to return to the above-mentioned step S31.

On the other hand, when the panel piping temperature TP is 60°C or lower in step S33 (step S33: Yes), and the indoor heat exchange temperature Te is 60°C or lower in step S34 (step S34: yes), it is detected that the indoor electric valve 23 An abnormality is generated (step S35).

In addition, when it is detected that an abnormality has occurred in the indoor electric valve 23 in each of the abnormality detection processes described above, the user is notified of the occurrence of the abnormality by, for example, a display on the light-emitting display unit 49 .

<Features of the air conditioner 1 of the present embodiment>

In the air conditioner 1 of the present embodiment, the control unit 7 has an abnormality detection unit 73 that detects an abnormality in the indoor electric valve 23, and the indoor electric valve 23 performs the state of making the refrigerant flow to the panel piping 36 of the radiant panel 30 and cooling. Switching of the state where the agent does not flow to the panel piping 36 of the radiation panel 30 . Therefore, it is possible to detect that an abnormality has occurred in the indoor electric valve 23 by the abnormality detection unit 73 . Therefore, problems such as frosting on the radiant panel 30 during cooling operation and abnormality of the surface temperature of the radiant panel 30 during air heating operation and radiant heating operation due to abnormality of the indoor electric valve 23 can be suppressed.

In addition, the refrigerant circuit 10 of the air conditioner 1 according to the present embodiment has: a main flow path 11 in which an outdoor electric valve 64, an outdoor heat exchanger 62, and a compressor 60 are sequentially provided; a first flow path 12, An indoor heat exchanger 20 is provided in the first flow path 12, and the first flow path 12 connects the branch portion 10a provided on the downstream side of the compressor 60 in the main flow path 11 and the outdoor motor. The confluence part 10b provided on the upstream side of the valve 64 is connected together; and the second flow path 13, in which the radiation panel 30 is provided, the second flow path 13 connects the branch part 10a and the confluence part 10b with the second flow path 13 1. The flow paths 12 are connected in parallel. Furthermore, the indoor electric valve 23 is provided in the refrigerant circuit 10 between the radiation panel 30 and the junction 10b. Therefore, in the air conditioner 1 in which the first flow path 12 provided with the indoor heat exchanger 20 and the second flow path 13 provided with the radiation panel 30 are connected in parallel, it is possible to detect an abnormality in the indoor electric valve 23 .

In addition, in the air conditioner 1 of the present embodiment, the abnormality detection unit 73 is based on the panel piping temperature TP detected by the panel temperature sensor 26 provided between the radiation unit 35 of the radiation panel 30 and the indoor electric valve 23, and the Based on the indoor heat exchange temperature Te detected by the indoor heat exchange temperature sensor 27 of the indoor heat exchanger 20, it is detected that the indoor electric valve 23 is abnormal. Therefore, the opening and closing state of the indoor electric valve 23 can be detected by comparing the panel piping temperature TP and the indoor heat exchange temperature Te. Therefore, when the indoor electric valve 23 should be closed, it is detected that the refrigerant leaks from the indoor electric valve 23, or when the indoor electric valve 23 should be opened, it is detected that the indoor electric valve 23 is closed. In this case, it can be detected that an abnormality has occurred in the valve mechanism.

In addition, in the air conditioner 1 according to the present embodiment, during the cooling operation, the abnormality detection unit 73 detects the difference only when the difference between the indoor temperature Ta detected by the indoor temperature sensor 24 and the indoor heat exchange temperature Te is 5 deg or more. It was detected that an abnormality occurred in the indoor electric valve 23 . Therefore, by excluding the case where the difference between the indoor temperature Ta and the indoor heat exchange temperature Te is relatively small, erroneous detection of an abnormality of the indoor electric valve 23 can be suppressed.

As mentioned above, although embodiment of this invention was described based on drawing, it cannot understand that a specific structure is limited to these embodiment. The scope of the present invention lies not in the description of the above-mentioned embodiment but in the content disclosed by the claims, and includes all changes within the meaning and scope equivalent to the claims.

In the above-mentioned embodiment, it has been described that the refrigerant circuit 10 connecting the indoor unit 2 and the outdoor unit 6 includes: the first flow path 12 provided with the indoor heat exchanger 20 ; and the first flow path 12 connected in parallel. The second flow path 13 is a case where the radiation panel 30 is provided in the second flow path 13, but the present invention is not limited thereto, and the indoor heat exchanger 20 and the radiation panel 30 may be connected in series.

That is, as shown in FIG. 12 , the refrigerant circuit 110 of the air conditioner 101 according to the modified example of the present embodiment has an annular main passage 111 in which the outdoor electric valve 64 , the outdoor heat exchanger 62 , and the compressor The machine 60, the radiation panel 30 and the indoor heat exchanger 20 are connected in sequence. The discharge-side piping and the suction-side piping of the compressor 60 are connected to a four-way switching valve 61 . Branch parts 101 a and 101 b are respectively provided on both sides of the radiation panel 30 , and both ends of the branch flow path 112 are connected to the branch parts 101 a and 101 b. In addition, the branch part 101 a is located between the indoor heat exchanger 20 and the radiation panel 30 , and the branch part 101 b is located on the side opposite to the branch part 101 a with respect to the radiation panel 30 . A three-way valve 123 is provided in the branch portion 101a.

A panel input temperature sensor 25 is provided between the branch portion 101 b and the radiation portion 35 of the radiation panel 30 , and a panel output temperature sensor 26 is provided between the branch portion 101 a and the radiation portion 35 of the radiation panel 30 .

In the refrigerant circuit 110, during the cooling operation, the four-way switching valve 61 is switched to the state shown by the dotted line in FIG. 12 . In addition, the three-way valve 123 is in a state where the refrigerant from the indoor heat exchanger 20 flows to the branch flow path 112 but does not flow to the radiation panel 30 . Therefore, as indicated by the dashed arrow in FIG. 12 , the high-temperature and high-pressure refrigerant discharged from the compressor 60 flows into the outdoor heat exchanger 62 through the four-way switching valve 61 . Then, the refrigerant condensed in the outdoor heat exchanger 62 flows into the indoor heat exchanger 20 after being decompressed by the outdoor electric valve 64 . In addition, the refrigerant evaporated in the indoor heat exchanger 20 flows into the compressor 60 through the branch flow path 112 , the four-way switching valve 61 , and the accumulator 65 .

During the hot air heating operation, the four-way switching valve 61 is switched to the state shown by the solid line in FIG. 12 . In addition, the three-way valve 123 is in a state in which the refrigerant discharged from the compressor 60 does not flow through the radiation panel 30 but flows through the branch flow path 112 . Therefore, as shown by the solid line arrow in FIG. 12 , the high-temperature and high-pressure refrigerant discharged from the compressor 60 flows into the indoor heat exchanger 20 through the four-way switching valve 61 and the branch flow path 112 . Then, the refrigerant condensed in the indoor heat exchanger 20 is decompressed through the outdoor electric valve 64 and then flows into the outdoor heat exchanger 62 . In addition, the refrigerant evaporated in the outdoor heat exchanger 62 flows into the compressor 60 through the four-way switching valve 61 and the accumulator 65 .

During the radiant heating operation, the four-way switching valve 61 is switched to the state shown by the solid line in FIG. 12 . In addition, the three-way valve 123 is in a state where the refrigerant discharged from the compressor 60 flows through the radiation panel 30 but does not flow through the branch flow path 112 . Therefore, as shown by the solid arrow in FIG. 12 , the high-temperature and high-pressure refrigerant discharged from the compressor 60 flows into the radiation panel 30 through the four-way switching valve 61 , and then flows into the indoor heat exchanger 20 . Then, the refrigerant condensed in the radiation panel 30 and the indoor heat exchanger 20 is decompressed through the outdoor electric valve 64 and then flows into the outdoor heat exchanger 62 . In addition, the refrigerant evaporated in the outdoor heat exchanger 62 flows into the compressor 60 through the four-way switching valve 61 and the accumulator 65 .

In the air conditioner 101 of this modified example, as in the above-mentioned embodiment, the abnormality detection unit 73 of the control unit 7 can detect that an abnormality has occurred in the three-way valve 123 that makes the refrigerant flow to the radiation panel. Switching between the state of the panel piping 36 at 30 and the state of preventing the refrigerant from flowing to the panel piping 36 of the radiation panel 30 .

In addition, in the modification described above, the outdoor electric valve 64, the outdoor heat exchanger 62, the compressor 60, the radiation panel 30, and the indoor heat exchanger 20 are sequentially connected in the annular main passage 111 of the refrigerant circuit 110. Up, but not limited to this. That is, it is also possible to reverse the positions of the radiation panel 30 and the indoor heat exchanger 20, and connect the outdoor electric valve 64, the outdoor heat exchanger 62, the compressor 60, the indoor heat exchanger 20 and the radiation panel 30 sequentially. In this case, both ends of the branch flow path 112 are connected to branch portions respectively provided on both sides of the radiation panel 30 . In addition, the three-way valve 123 for switching between the state in which the refrigerant flows to the panel pipe 36 of the radiant panel 30 and the state in which the refrigerant does not flow to the panel pipe 36 of the radiant panel 30 is provided in a heat sink located in the room with the radiant panel 30 interposed therebetween. A branch portion on the opposite side of the exchanger 20 side.

In addition, in the above-mentioned embodiment, the case where the indoor electric valve 23 is provided between the radiation panel 30 and the confluence part 10b in the refrigerant circuit 10 has been described, but the present invention is not limited thereto. For example, a three-way valve may be provided in the confluence portion 10b, and the three-way valve may be used as the indoor electric valve 23.

In addition, in the above-mentioned embodiment, the abnormality detecting unit 73 is described based on the panel piping temperature TP detected by the panel output temperature sensor 26 provided between the radiation unit 35 of the radiation panel 30 and the indoor electric valve 23, In addition to the indoor heat exchange temperature Te, it is detected that the indoor electric valve 23 is abnormal, but the present invention is not limited thereto. That is, for example, it is also possible to detect an abnormality in the indoor electric valve 23 based on the temperature detected by the panel input temperature sensor 25 relative to the radiation portion of the radiation panel 30 and the indoor heat exchange temperature Te. 35 is arranged on the opposite side of indoor electric valve 23.

In addition, in the above-mentioned embodiment, when the difference between the indoor temperature Ta and the indoor heat exchange temperature Te is equal to or greater than a predetermined value during the cooling operation, the abnormality detection unit 73 detects that the indoor electric valve 23 has generated a fault. exception, but not limited to this. When the pressure (low pressure) in the indoor heat exchanger 20 is below a predetermined value, the abnormality detection unit 73 can prevent erroneous detection by detecting the abnormality of the indoor electric valve 23 . Therefore, it may be detected that an abnormality has occurred in the indoor electric valve 23 when the difference between the indoor temperature Ta and the panel piping temperature TP is equal to or greater than a predetermined value.

In addition, in the above-mentioned embodiment, the case where the abnormality detection unit 73 detects that the indoor electric valve 23 is abnormal when the indoor electric valve 23 is completely closed during the radiant heating operation has been described. this. That is, not only when the indoor electric valve 23 is fully closed, but also when the opening of the indoor electric valve 23 is smaller than the necessary opening (the opening that makes the surface temperature of the radiation panel 30 reach the panel target temperature range), It can be detected that an abnormality has occurred in the indoor electric valve 23 .

In addition, in the above-mentioned embodiment, it was described that when all of (Formula 1) to (Formula 4) are satisfied during cooling operation, all of (Formula 5) to (Formula 7) are satisfied during hot air heating operation. ) and when all of (Formula 8) to (Formula 10) are satisfied during radiant heating operation, it is detected that an abnormality has occurred in the indoor electric valve 23 , but the present invention is not limited thereto. That is, when at least (Formula 1) is satisfied during cooling operation, at least (Formula 5) is satisfied during hot air heating operation, and at least (Formula 8) is satisfied during radiant heating operation, it is detected that It is enough if there is an abnormality in the indoor electric valve 23 . In addition, the numerical values specifically cited in (Formula 1) to (Formula 8) are merely examples, and can be changed as appropriate.

Industrial availability

The present invention can detect the abnormality of the valve mechanism.

Label description

1 air conditioner; 2 indoor unit; 6 outdoor unit; 10 refrigerant circuit; 10a branch; 10b confluence; 11 main flow; 12 first flow; 13 second flow; 20 indoor heat exchanger; 21 indoor fan ;23 indoor electric valve (valve mechanism); 24 indoor temperature sensor; 26 panel output temperature sensor (panel temperature sensor); 27 indoor heat exchange temperature sensor; 30 radiation panel; 35 radiation part; 60 compressor; 62 outdoor heat exchanger ; 64 outdoor electric valve (decompression mechanism); 73 abnormal detection department (abnormal detection unit); 123 three-way valve (valve mechanism).

Claims (6)

1. An air conditioner having a refrigerant circuit connecting an indoor unit and an outdoor unit, characterized in that, The indoor unit has: an indoor heat exchanger installed inside the indoor unit so as to face a fan; and a radiation panel provided on a surface of the indoor unit, The refrigerant circuit has: a valve mechanism for switching between a state in which refrigerant flows to the radiation panel and a state in which refrigerant does not flow to the radiation panel; and An abnormality detection unit detects an abnormality in the valve mechanism according to the temperature of the radiation panel. 2. The air conditioner according to claim 1, wherein: The refrigerant circuit has: a main flow, in which a decompression mechanism, an outdoor heat exchanger and a compressor are sequentially arranged; The first flow path, in which the indoor heat exchanger is provided, divides the main flow path provided on the downstream side of the compressor in the heating operation. the branch part is connected to the confluence part provided on the upstream side of the decompression mechanism; and a second flow path in which the radiation panel is provided, the second flow path connects the branch portion and the confluence portion to the first flow path in parallel, The valve mechanism is provided between the radiation panel and the confluence part in the refrigerant circuit. 3. The air conditioner according to claim 1 or 2, characterized in that, The abnormality detection unit detects that an abnormality has occurred in the valve mechanism when the refrigerant flows to the radiation panel while the valve mechanism is switched to a state where the refrigerant does not flow to the radiation panel. 4. The air conditioner according to any one of claims 1 to 3, characterized in that: The air conditioner has: an indoor heat exchange temperature sensor disposed on the indoor heat exchanger; and a panel temperature sensor disposed between the radiation portion of the radiation panel and the valve mechanism, The abnormality detection unit detects an abnormality in the valve mechanism based on the temperature detected by the panel temperature sensor and the temperature detected by the indoor heat exchange temperature sensor. 5. The air conditioner according to claim 4, wherein: The abnormality detection means detects that an abnormality has occurred in the valve mechanism when the pressure in the indoor heat exchanger is equal to or lower than a predetermined value during cooling operation. 6. The air conditioner according to claim 4 or 5, characterized in that, The air conditioner also has an indoor temperature sensor for detecting indoor temperature, The abnormality detection means detects that an abnormality has occurred in the valve mechanism when the difference between the temperature detected by the indoor temperature sensor and the temperature detected by the indoor heat exchange temperature sensor is greater than or equal to a predetermined value.

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