WO2014092064A1

WO2014092064A1 - Refrigeration system device

Info

Publication number: WO2014092064A1
Application number: PCT/JP2013/083037
Authority: WO
Inventors: 三代一寿
Original assignee: シャープ株式会社
Priority date: 2012-12-14
Filing date: 2013-12-10
Publication date: 2014-06-19
Also published as: CN104583689B; JP6174314B2; JP2014119162A; CN104583689A

Abstract

The present invention provides a refrigeration system device in which damage to a receiver of a flow rate adjustment part can be avoided even when pressure inside the receiver is abnormally high. The present invention is a refrigeration system device provided with a flow rate adjustment part comprising a low-pressure-side flow rate adjustment device, a receiver, and a high-pressure-side flow rate adjustment device connected in series to a refrigerant circuit, wherein in the high-pressure-side and/or low-pressure-side flow rate adjustment devices, the other end of a first linking tube connected to the receiver is connected to the bottom part on one side of a valve casing, the other end of a second linking tube connected to an aperture device is connected in a transverse tubular shape to the other side of the valve casing, and the direction of refrigerator flow from the receiver is set to a valve-opening direction in a valve body internally mounted in the valve casing so that the valve body can rest against the valve casing and detach from the valve casing.

Description

Refrigeration system equipment

The present invention relates to a refrigeration system apparatus including a flow rate adjusting unit that adjusts the amount of refrigerant circulating in the refrigerant circuit.

In a refrigeration system apparatus such as an air conditioner, the optimum amount of refrigerant flowing through the refrigerant circuit differs between cooling operation and heating operation. In Patent Document 1, in order to circulate the refrigerant in an optimum amount of refrigerant, a receiver for collecting the refrigerant and a flow rate adjusting device are provided on both sides thereof, and the refrigerant is collected in the receiver or returned from the receiver to the refrigerant circuit. The refrigerant is circulated with the optimum amount of refrigerant.

In Patent Document 2, a compressor, a condenser that allows the refrigerant from the compressor to pass through the cooling medium at a high pressure through a heat exchange relationship, and an evaporation that allows the refrigerant to pass at a low pressure through a heat exchange relationship with the medium to be cooled. An expansion device disposed in the closed-loop refrigerant circuit downstream of the condenser and upstream of the evaporator; and a receiver for storing refrigerant connected in fluid communication with the closed-loop refrigerant circuit by at least one refrigerant line; A refrigeration system apparatus comprising a refrigerant flow control device arranged in at least one refrigerant line is disclosed.

In Patent Document 3, a compressor, a condenser, an expansion valve, and an evaporator are sequentially connected by a refrigerant pipe to form a refrigeration air conditioning cycle, and a high-pressure side refrigerant pipe extending from the compressor discharge port to the expansion valve is expanded. A bypass pipe communicating with the low-pressure side refrigerant pipe leading from the valve to the compressor suction port via an on-off valve, a refrigerant adjustment tank with a control on-off valve in parallel with the expansion valve, and the opening degree of these valves A refrigerating air conditioner provided with a controller for adjustment is disclosed.

Japanese Patent No. 3334507 Special Table 2011-521194 Japanese Patent No. 4115017

By the way, in Patent Documents 1 to 3, when the refrigerant is accumulated in the receiver and the flow adjustment device connected to the receiver is maintained in an unexpectedly closed state due to some trouble, the receiver may be abnormal depending on the surrounding conditions. There is a possibility that the receiver may be damaged due to the high pressure.

In view of the above, an object of the present invention is to provide a refrigeration system apparatus that can prevent a receiver from being damaged by allowing a refrigerant to escape even when the receiver has an abnormally high pressure.

In order to achieve the above object, a refrigeration system apparatus according to the present invention comprises a refrigerant circuit in which a compressor, a condenser, a throttling device, and an evaporator are sequentially connected by piping to flow a refrigerant, and the refrigerant flowing through the refrigerant circuit A flow rate adjusting unit that adjusts the flow rate is provided in parallel with the expansion device, and the flow rate adjustment unit uses a pressure of a refrigerant flowing from a high pressure side before and after the expansion device to a low pressure side to collect a refrigerant, and the refrigerant A high-pressure side connecting pipe connecting the high-pressure side of the expansion device in the circuit and the receiver, a low-pressure side connecting pipe connecting the low-pressure side of the expansion device and the receiver in the refrigerant circuit, and a connecting pipe In the refrigeration cycle provided with the high-pressure side and low-pressure side flow rate adjusting devices for adjusting the flow rate of the refrigerant, at least one of the high-pressure side and low-pressure side flow rate adjusting devices is The direction of flow of the refrigerant from over server characterized in that it is a valve opening direction.

In the present invention, at least one of the high-pressure side and low-pressure side flow rate adjusting devices has the other end of the first connecting pipe connected to the receiver connected to one side of the valve box, The other end of the second connecting pipe connected to the side is connected to the other side of the valve box, and the valve body that is detachably seated in the valve box has the direction in which the refrigerant flows from the receiver as the valve opening direction. Other configurations may be adopted.

Furthermore, as for the connecting portion of the connecting pipe to the valve box, the first connecting pipe connected to the receiver is connected to the bottom of one side of the valve box, and the second connecting pipe connected to the expansion device side is the valve box. You may employ | adopt the structure connected to the upper part of.

According to the present invention, at least one of the high-pressure side and low-pressure side flow control devices has a valve opening direction in which the refrigerant flows from the receiver. The refrigeration system apparatus which can be avoided and is excellent in safety can be provided.

It is a refrigerating cycle figure which shows the flow of the refrigerant | coolant at the time of the air_conditionaing | cooling operation which is embodiment of this invention. It is the refrigerating cycle figure which similarly shows the flow of the refrigerant | coolant at the time of heating operation. It is a schematic diagram of the flow volume adjustment part which shows the connection state of piping. It is a front view of a flow control device. It is a perspective view of a flow control device. (A) Sectional drawing of the flow regulating device in the valve-closed state, (b) is a sectional view of the flow regulating device in the valve-opened state. It is a schematic diagram of the flow volume adjustment part which shows another piping example. It is a refrigerating cycle figure which shows the flow of the refrigerant | coolant at the time of the air_conditionaing | cooling operation which is another embodiment of this invention.

Hereinafter, an embodiment in which the present invention is applied to a refrigeration system apparatus for an air conditioner will be described with reference to the drawings. FIG. 1 is a refrigeration cycle diagram showing a refrigerant flow during cooling operation, and FIG. 2 is a refrigeration cycle diagram showing a refrigerant flow during heating operation. As shown in the figure, the air conditioner of the present embodiment is one in which one indoor unit 1 and one outdoor unit 2 are connected by a refrigerant pipe 3, and on the side of the outdoor unit 2, a compressor 4 and a refrigerant are connected. The four-way valve 5 for switching the flow path, the outdoor heat exchanger 6 and the expansion device 7 are provided, and the indoor unit 1 is provided with an indoor heat exchanger 8.

In this refrigeration cycle, during cooling operation, as shown in FIG. 1, the refrigerant discharged from the compressor 4 passes through the outdoor heat exchanger 6, the expansion device 7, and the indoor heat exchanger 8 from the four-way valve 5. The forward flow returns to 4. In the heating operation, as shown in FIG. 2, the refrigerant discharged from the compressor 4 returns from the four-way valve 5 to the compressor 4 through the indoor heat exchanger 8, the expansion device 7, and the outdoor heat exchanger 6. The flow is in the opposite direction.

Therefore, in the refrigeration cycle, the outdoor heat exchanger 6 functions as a condenser and the indoor heat exchanger 8 functions as an evaporator during cooling operation. During the heating operation, the indoor heat exchanger 8 functions as a condenser, and the outdoor heat exchanger 6 functions as an evaporator.

Thus, the refrigeration cycle during the cooling operation and the heating operation is a reversible cycle refrigerant circuit, and the flow direction of the refrigerant is the order of the compressor 4, the four-way valve 5, the condenser, the expansion device 7, and the evaporator. Then, the refrigerant circuit 10 is constructed.

In this example, as shown in FIGS. 1 and 2, a bypass path 12 with an on-off valve 11 is connected in parallel with the outdoor heat exchanger 6 to return a part of the refrigerant in the refrigerant circuit 10 to the compressor side. However, it may be a refrigerant circuit without these bypass passages with on-off valves.

A flow rate adjusting unit 13 that adjusts the flow rate of the refrigerant flowing through the refrigerant circuit 10 is connected in parallel with the expansion device 7. The flow rate adjusting unit 13 includes a receiver 14 that accumulates the refrigerant using the pressure of the refrigerant flowing from the high pressure side before and after the expansion device 7 to the low pressure side, the high pressure side branching unit of the expansion device 7 in the refrigerant circuit 10, and the receiver 14. Connecting

pipes

21 and 23 on the high-pressure side, connecting

pipes

22 and 24 on the low-pressure side connecting the low-pressure branch of the expansion device 7 in the refrigerant circuit 10 and the receiver 14, and connecting pipes 21 to 24, high-pressure side and low-pressure side flow rate adjusting

devices

15 and 16 for adjusting the flow rate of the refrigerant.

The connecting pipe 21 connects the receiver 14 and the first flow rate adjusting device 15. The connecting pipe 22 connects the receiver 14 and the second flow rate adjusting device 16. The connecting pipe 23 connects the first flow rate adjusting device 15 and the branching portion on the outdoor heat exchanger side of the expansion device 7 of the refrigerant circuit 10. The connecting pipe 24 connects the second flow rate adjusting device 16 and the branch portion on the indoor heat exchanger side of the expansion device 7 of the refrigerant circuit 10.

The flow rate adjusting unit 13 controls the opening degree of both the flow rate adjusting

devices

15 and 16 according to the discharge temperature of the compressor 4 to store the refrigerant in the receiver 14 or return the refrigerant to the refrigerant circuit 10. The refrigerant circulation amount in the refrigerant circuit 10 is appropriately maintained.

The receiver 14 is a cylindrical container that can contain a refrigerant, and a connection pipe 21 from the first flow rate adjustment device 15 and a connection pipe 22 from the second flow rate adjustment device 16 are provided on the bottom surface thereof. It is connected.

As shown in FIG. 3, when there is a refrigerant flow from right to left, such as in a cooling operation cycle, the first flow rate adjustment device 15 functions as a high-pressure side flow rate adjustment device, and the second flow rate adjustment device 16 It functions as a low-pressure flow rate adjustment device. When there is a refrigerant flow from left to right, such as in a heating operation cycle, the second flow rate adjustment device 16 functions as a high pressure side flow rate adjustment device, and the first flow rate adjustment device 15 functions as a low pressure side flow rate adjustment device. Function. These flow rate adjusting

devices

15 and 16 may have a function of adjusting the amount of refrigerant entering the receiver 14 by changing the area of the opening through which the refrigerant passes, similarly to the expansion valve and the throttle device. An electromagnetic valve that completely blocks or conducts the flow of the refrigerant may be used.

4 is a front view of the flow rate adjusting device, FIG. 5 is a perspective view of the flow rate adjusting device viewed obliquely from above, FIG. 6A is a sectional view of the flow rate adjusting device in a closed state, and FIG. Sectional drawing of the flow control apparatus of a state is shown. The high-pressure side and low-pressure side flow control devices have the same piping connection structure. Therefore, a description will be given using the piping structure of the second flow rate adjusting device 16 as a low pressure side flow rate adjusting device.

In the flow rate adjusting device 16, the other end of the first connecting pipe 22 connected to the receiver 14 is connected to one side of the valve box 16a, and the other end of the second connecting pipe 24 connected to the expansion device 7 side. The valve body 31 is connected to the other side of the valve box 16a and is detachably seated on the valve seat 33 with the valve hole 34 in the valve box 16a. The direction of the refrigerant flowing from the receiver 14 is the valve opening direction. ing. In the following description, when the flow of the refrigerant flowing out from the receiver 14 goes in the valve closing direction, the flow direction may be referred to as “forward flow”. Conversely, when there is a flow of refrigerant toward the valve opening direction, this may be referred to as “reverse flow”.

Here, the connection location of the first connecting pipe 22 is not particularly limited as long as it is one side of the valve box 16a, but the other end of the connecting pipe 22 is connected in a vertical tubular shape to the one side bottom of the valve box 16a. The illustrated embodiment can be exemplified. On the other hand, the 2nd connecting pipe 24 connected to the expansion apparatus 7 side is connected to the upper part of the valve box 16a. The connection point of the second connecting pipe 24 is also not limited as long as it is an upper part of the valve box 16a and communicates with the valve chamber 36. In this example, the second connecting pipe 24 is not limited to the valve box. It is connected to the valve chamber 36 at the upper part of 16a in a lateral tubular shape from the lateral direction.

The valve body 31 in the valve box 16a is a needle valve protruding from one side of the moving body 30 that reciprocates in the valve box 16a, and moves so as to be detachable from the valve seat 33 with the valve hole 34. The valve body 31 and the valve hole 34 form a throttle portion that can be fully closed and can be fully closed in accordance with the refrigeration load. The moving body 30 moves in the valve box 16a by a driving force (for example, electromagnetic force) from a driving unit (not shown).

The above pipe connection structure is the same in the first flow rate adjusting device 15. Specifically, the connecting pipe 21 from the receiver 14 is connected to the bottom of the valve box 15 a of the first flow rate adjusting device 15. Further, the connecting pipe 23 on the throttle device side is connected to the upper side surface of the valve box 15 a of the first flow rate adjusting device 15 as a horizontal pipe.

The expansion device 7 adjusts the condensation and evaporation pressure of the refrigerant circuit 10. For this reason, a pressure difference arises before and after the flow path. By utilizing this pressure difference, a part of the refrigerant in the refrigerant circuit 10 is condensed and stored in the receiver 14 of the flow rate adjusting unit 13, and the refrigerant in the receiver 14 is returned to the refrigerant circuit.

In the above configuration, in the cooling operation cycle shown in FIG. 1, the high-temperature and high-pressure refrigerant discharged from the compressor 4 is heat-exchanged by the outdoor heat exchanger 6 functioning as a condenser, and then depressurized through the expansion device 7. Then, it enters into the indoor heat exchanger 8 that functions as an evaporator as a gas refrigerant, where heat is exchanged and returns to the compressor 4.

In the heating operation cycle shown in FIG. 2, the high-temperature and high-pressure refrigerant discharged from the compressor 4 is subjected to heat exchange in the indoor heat exchanger 8 that functions as a condenser, and then decompressed through the expansion device 7. It enters into the outdoor heat exchanger 6 that functions as an evaporator as a gas refrigerant, where heat is exchanged and returns to the compressor 4.

In the cooling operation cycle and the heating operation cycle, in the flow rate adjustment unit 13, high-pressure liquid refrigerant enters from the high-pressure side flow

rate adjustment devices

15 and 16, and is depressurized (the degree to which pressure is reduced depends on the opening degree of the flow rate adjustment device). The liquid refrigerant is stored in the receiver 14. On the other hand, the liquid refrigerant in the receiver 14 enters the flow

rate adjusting devices

15 and 16 on the low pressure side from the connection port, is reduced in pressure to become a mixed refrigerant of gas and liquid, and is returned to the refrigerant circuit 10.

For example, in the cooling operation cycle, the flow rate adjustment unit 13 shown in FIG. 3 has a refrigerant flow from right to left, and the first flow rate adjustment device 15 serves as a high-pressure side flow rate adjustment device. The adjusting device 16 functions as a flow rate adjusting device on the low pressure side. At this time, in the first flow rate adjusting device 15, the refrigerant is introduced from the lateral direction into the valve chamber in the valve box 15 a through the connecting pipe 23 and flows into the receiver 14 through the connecting pipe 21 from the bottom of the valve box 15 a. When the first flow rate adjusting device 15 is maintained in a closed state for some reason, the inflow circuit to the receiver 14 side is cut off, so that the receiver 14 is not adversely affected.

On the contrary, in the second flow rate adjusting device 16, the refrigerant enters the valve box from the receiver 14 through the connecting pipe 22 through the vertical tube at the bottom of the valve box 16 a of the second flow rate adjusting device 16, and the valve body 31 (needle valve). ) In the direction of the refrigerant flow in the expansion device 7 from the lateral tubular connecting pipe 24 on the side surface. That is, the refrigerant flows in the forward direction, but for some reason, even if the second flow rate adjustment device 16 is maintained in the valve-closed state, the high-pressure refrigerant from the receiver 14 tries to flow toward the low-pressure side. The body 31 is pushed up in the direction to open the valve. Therefore, even when the receiver 14 has an abnormally high pressure, the refrigerant flows out of the low-pressure flow rate adjusting device, so that the receiver can be prevented from having an abnormally high pressure, and damage to the receiver can be avoided.

On the contrary, in the heating operation cycle, the flow rate adjustment unit 13 shown in FIG. 3 has a refrigerant flow from left to right, and the second flow rate adjustment device 16 serves as the high-pressure side flow rate adjustment device. The flow rate adjustment device 15 functions as a low pressure side flow rate adjustment device. At this time, in the second flow rate adjusting device 16, the refrigerant is introduced from the high pressure side throttling device 7 through the connecting pipe 24 into the valve chamber in the valve box 16 a from the lateral direction, and is received from the bottom of the valve box 16 a by the connecting pipe 22. 14 will flow into. Even if the second flow rate adjusting device 16 is maintained in the closed state for some reason, the refrigerant flows in the forward direction, and the inflow circuit to the receiver 14 side is interrupted, which adversely affects the receiver 14. There is nothing.

On the other hand, in the first flow rate adjusting device 15 located on the downstream side of the receiver 14, the refrigerant passes from the receiver 14 through the connecting pipe 21 into the valve box through the vertical tube at the bottom of the valve box 15 a of the first flow rate adjusting device 15. It flows into the valve chamber 36 side by the throttle amount (opening area) of the valve body 31 (needle valve), and flows downstream from the side tubular connecting pipe 23 in the refrigerant flow direction of the throttle device 7. That is, in the first flow control device 15, the refrigerant flows in the reverse direction. Even if the first flow control device 15 is maintained in the closed state for some reason, the high-pressure refrigerant from the receiver 14. Pushes up the valve body 31 in a direction to open the valve 31 in an attempt to flow to the low pressure side. Therefore, even when the receiver 14 has an abnormally high pressure, the refrigerant flows out of the low-pressure flow rate adjusting device, so that the receiver can be prevented from having an abnormally high pressure, and damage to the receiver can be avoided.

Here, when an open / close electromagnetic valve that completely cuts off or conducts the flow of the refrigerant is used as the flow

rate adjusting device

15, 16, when the refrigerant is accumulated in the receiver 14, the high-pressure side electromagnetic valve (flow rate adjusting device 15 or 16). When the refrigerant is discharged from the receiver 14, the low-pressure side solenoid valve (flow rate adjusting device 15 or 16) is temporarily opened to adjust the amount of refrigerant flowing through the system.

In this case, both the solenoid valves are closed except when adjusting the amount of the refrigerant. For example, if the system goes down for some reason, the receiver 14 is kept in a state where the refrigerant is accumulated. There is a possibility that the inside of the receiver may become an abnormally high pressure due to an increase in the ambient temperature or the like. However, if at least one of the flow

rate adjusting devices

15 and 16 is in the valve opening direction, It is possible to open the valve by the pressure in 14 and release the high pressure in the receiver 14, and to prevent the receiver 14 from being damaged.

FIG. 7 shows another embodiment of the pipe connection configuration. In this example, entry / exit to / from the receiver 14 is performed by a single connecting pipe 28, and the branch connecting pipes 28 a and 28 b are connected to the bottoms of the valve boxes of the flow

rate adjusting devices

15 and 16, respectively. Even with such a configuration of the flow rate adjusting unit 13, the same effects as the embodiment shown in FIG. 3 can be obtained, and damage to the receiver can be prevented.

FIG. 8 is a refrigeration cycle diagram showing the flow of refrigerant during cooling operation, which is another embodiment of the present invention. In the embodiment shown in FIG. 1 and FIG. 2, an example is shown in which the flow rate adjusting unit 13 including the first flow rate adjusting device 15, the second flow rate adjusting device and the receiver 14 and the throttle device 7 are connected in parallel. In this example, the expansion device 7 is composed of a first flow rate adjustment device 15 and a second flow rate adjustment device 16, and a receiver 14 as a flow rate adjustment unit 13 is interposed between both flow

rate adjustment devices

15 and 16. A piping structure is employed, and at least one of the first flow rate adjustment device 15 and the second flow rate adjustment device 16 is configured such that the direction in which the refrigerant flows from the receiver 14 is the valve opening direction.

And the

flow control devices

15 and 16 of this example employ the piping structure shown in FIG. 3, and the connecting pipe 23 is connected to the refrigerant circuit 10 on the outdoor heat exchanger 6 side. The connecting pipe 24 is connected to the refrigerant circuit 10 on the indoor heat exchanger 8 side. Each of the flow

rate adjusting devices

15 and 16 employs the configuration shown in FIGS.

In the above-described piping connection configuration, in the cooling operation cycle, the first flow rate adjusting device 15 functions as a high pressure side flow rate adjusting device, and the second flow rate adjusting device 16 functions as a low pressure side flow rate adjusting device. In the heating operation cycle, the second flow rate adjustment device 16 functions as a high-pressure side flow rate adjustment device, and the first flow rate adjustment device 15 functions as a low-pressure side flow rate adjustment device.

In any case, when the flow

rate adjusting devices

15 and 16 are closed, at least one of the high pressure side and low pressure side flow

rate adjusting devices

15 and 16 causes the refrigerant to flow in the opposite direction, and the receiver. Since the high-pressure refrigerant from 14 pushes up in the direction to open the valve body 31 in an attempt to flow to the low-pressure side, the receiver can be prevented from becoming abnormally high pressure, and damage to the receiver can be avoided.

In the embodiment shown in FIG. 8, it is needless to say that the pipe connection configuration shown in FIG. 7 may be adopted instead of the pipe connection configuration shown in FIG.

As is clear from the description from the above embodiments, the present invention is configured such that a compressor, a condenser, a throttling device, and an evaporator are sequentially connected by piping to form a refrigerant circuit through which refrigerant flows, and the refrigerant flowing through the refrigerant circuit A flow rate adjusting unit that adjusts the flow rate is provided in parallel with the expansion device, and the flow rate adjustment unit uses a pressure of a refrigerant flowing from a high pressure side before and after the expansion device to a low pressure side to collect a refrigerant, and the refrigerant A high-pressure side connecting pipe connecting the high-pressure side of the expansion device in the circuit and the receiver, a low-pressure side connecting pipe connecting the low-pressure side of the expansion device and the receiver in the refrigerant circuit, and a connecting pipe In the refrigeration cycle comprising the high-pressure side and low-pressure side flow rate adjusting devices for adjusting the flow rate of the refrigerant, at least one of the high-pressure side and low-pressure side flow rate adjusting devices is a receiving cycle. The flow direction of the refrigerant from is characterized by a valve opening direction.

According to the above configuration, since at least one of the flow directions of the refrigerant from the receiver 14 in the high-pressure side and low-pressure side flow control devices is in the valve opening direction, even if the inside of the receiver 14 becomes abnormally high in pressure, It acts in the direction in which the flow opens, and damage to the receiver can be avoided.

In this case, the connection structure of the connecting pipe is such that when the second flow rate adjusting device is a low-pressure side flow adjusting device, the other end of the first connecting tube 22 connected to the receiver 14 is on one side of the valve box 16a. The valve body 31 that is connected and connected to the other end of the second connecting pipe 24 connected to the expansion device 7 side is connected to the other side of the valve box 16a and is detachably seated on the valve box 16a. Alternatively, a configuration may be adopted in which the direction in which the refrigerant flows is the valve opening direction. That is, as a specific piping structure, the first connecting pipe 22 connected to the receiver 14 is connected to the bottom of one side of the valve box 16a, and the second connecting pipe 24 connected to the expansion device 7 side is the valve box. The structure connected from the horizontal direction to the upper part of 16a, for example, the upper part of the valve box 16a, is employable.

According to such a configuration, when the receiver 14 has an abnormally high pressure, the high-pressure refrigerant flows into the valve box from the bottom of the valve box 16a through the vertical tubular connecting pipe 22, and the valve seat with the valve hole 34 is provided. Since the valve body 31 that is seated on and off the seat 33 is pushed up and acts in the valve opening direction, the receiver 14 can be prevented from being damaged.

Furthermore, the present invention provides a refrigerant circuit in which a compressor, a condenser, a throttle device, and an evaporator are sequentially connected by piping to flow a refrigerant, and the throttle device adjusts the flow rate of the refrigerant flowing through the refrigerant circuit. A receiver that includes a first flow control device and a second flow control device, and stores the refrigerant between the first flow control device and the second flow control device using the pressure of the refrigerant flowing through the refrigerant circuit. And at least one of the first flow rate adjusting device and the second flow rate adjusting device can be applied to a refrigeration system apparatus in which the direction of refrigerant flow from the receiver is the valve opening direction.

According to the above configuration, since the flow direction of the refrigerant from the receiver 14 is the valve opening direction in at least one of the high-pressure side and low-pressure side flow control devices, even if the inside of the receiver 14 becomes abnormally high in pressure, It acts in the direction in which the flow opens, and damage to the receiver can be avoided.

The present invention is not limited to the above-described embodiments, and various modifications can be made within the scope of the claims, and the technical means disclosed in different embodiments can be appropriately combined. Such embodiments are also included in the technical scope of the present invention.

DESCRIPTION OF SYMBOLS 1 Indoor unit 2 Outdoor unit 3 Refrigerant piping 4 Compressor 5 Four way valve 6 Outdoor heat exchanger 7 Throttle device 8 Indoor heat exchanger 10 Refrigerant circuit 11 On-off valve 13 Flow rate adjustment part 14 Receiver 15 1st flow rate adjustment device 16 2nd Flow

rate adjusting device

21, 22, 23, 24 Connecting pipe 30 Moving body 31 Valve body 33 Valve seat 34 Valve hole

Claims

A compressor, a condenser, a throttling device, and an evaporator are sequentially connected by a pipe to form a refrigerant circuit through which refrigerant flows, and a flow rate adjusting unit that adjusts the flow rate of the refrigerant flowing through the refrigerant circuit is provided in parallel with the throttling device. The flow rate adjusting unit includes a receiver that collects refrigerant by using a pressure of refrigerant flowing from a high pressure side before and after the expansion device to a low pressure side, and a high pressure side that connects the high pressure side of the expansion device and the receiver in the refrigerant circuit Connecting pipe, a low-pressure side connecting pipe connecting the low-pressure side of the throttling device in the refrigerant circuit and the receiver, and a high-pressure side and low-pressure side flow rate adjusting device interposed in each connecting pipe to adjust the flow rate of the refrigerant In a refrigeration cycle with
In at least one of the high-pressure side and low-pressure side flow control devices, the refrigerant flow direction from the receiver is the valve opening direction.
At least one of the high-pressure side and the low-pressure side flow rate adjusting device has a second connecting end connected to the one side of the valve box and the other end of the first connecting pipe connected to the receiver connected to the throttling device side. 2. The valve body in which the other end of the connecting pipe 2 is connected to the other side of the valve box and is detachably seated in the valve box, wherein the direction in which the refrigerant flows from the receiver is the valve opening direction. Refrigeration system equipment.
The refrigeration system according to claim 2, wherein the first connecting pipe connected to the receiver is connected to one bottom portion of the valve box, and the second connecting pipe connected to the expansion device side is connected to an upper part of the valve box. apparatus.
The refrigeration system apparatus according to claim 3, wherein the second connecting pipe connected to the expansion device side is connected to an upper portion of the valve box from a lateral direction.
A compressor, a condenser, a throttling device, and an evaporator are sequentially connected by a pipe to form a refrigerant circuit through which a refrigerant flows. The throttling device includes a first flow rate adjusting device that adjusts the flow rate of the refrigerant flowing through the refrigerant circuit; A receiver for collecting refrigerant using the pressure of the refrigerant flowing through the refrigerant circuit is provided between the first flow regulator and the second flow regulator. In at least one of the first flow rate adjusting device and the second flow rate adjusting device, the refrigerant flow direction from the receiver is a valve opening direction.