CN210154138U - Expansion valve assembly, bidirectional throttling system and air conditioner - Google Patents

Abstract

The utility model provides an expansion valve assembly, a two-way throttling system and an air conditioner. The expansion valve assembly comprises: a first one-way valve, a second one-way valve, a heating expansion valve, a fourth one-way valve, a series-connected one-way valve, a The third one-way valve and the refrigeration expansion valve can realize the independent selection and operation of the heating expansion valve and the refrigeration expansion valve through this solution. When the required cooling capacity and heating capacity are greatly different, the cooling and heating operation modes can be selected. More matching refrigeration expansion valve and heating expansion valve, so as to achieve more precise adjustment of refrigeration and heating.

Description

An expansion valve assembly, a two-way throttling system and an air conditioner

technical field

The utility model relates to the technical field of air conditioners, in particular to an expansion valve assembly, a two-way throttle system and an air conditioner.

Background technique

The common heat pump unit with expansion valve as the throttling component usually has only one expansion valve, but it must meet the throttling requirements of the cooling mode and the heating mode on the flow path at the same time; so when the difference between the cooling capacity and the heating capacity of the unit is large, a single expansion valve should be used. The expansion valve throttling will not be able to take into account the cooling and heating effects at the same time, resulting in a significant reduction in the air conditioning effect.

Utility model content

In view of this, the present invention aims to provide an expansion valve assembly, so as to solve at least one aspect of the above problems at least to a certain extent.

In order to solve the above problems, the present invention provides an expansion valve assembly, the expansion valve assembly includes: a first one-way valve, a second one-way valve, a heating expansion valve, a fourth one-way valve, and a third one-way valve connected in series valve and refrigeration expansion valve.

Optionally, the refrigeration expansion valve and the heating expansion valve are thermal expansion valves or electronic expansion valves.

Make flexible choices according to actual needs.

Compared with the prior art, the expansion valve assembly of the present invention has the following advantages

The expansion valve assembly of the utility model can realize the independent selection and independent operation of the heating expansion valve and the refrigeration expansion valve through this solution. More matching refrigeration expansion valve and heating expansion valve, so as to achieve more precise adjustment of refrigeration and heating.

A two-way throttling system, comprising the above-mentioned expansion valve assembly, and also comprising a compressor, an outdoor heat exchanger and an indoor heat exchanger, the components are connected by pipelines, and one end of the indoor heat exchanger is connected to the On the pipeline between the refrigeration expansion valve and the third one-way valve, the other end of the indoor heat exchanger is connected to the compressor, and one end of the outdoor heat exchanger is connected to the heating expansion valve and the compressor. On the pipeline between the fourth one-way valves, the other end of the outdoor heat exchanger is connected to the compressor.

Optionally, it also includes an accumulator, one end of the accumulator is connected to the pipeline between the third one-way valve and the fourth one-way valve, and the other end of the accumulator is connected to the on the pipeline between the first one-way valve and the second one-way valve.

Prevent the compressor from sucking in liquid refrigerant and causing liquid slam.

Optionally, a drying filter is further provided on the pipeline connected between the first one-way valve and the second one-way valve of the liquid reservoir.

Prevent the blockage of the system and the expansion valve, ensure the smooth flow of the pipeline system, and improve the service life of the system.

Optionally, it also includes a four-way valve, the first interface of the four-way valve is connected to the indoor heat exchanger, the second interface of the four-way valve is connected to the air inlet of the compressor, the The third port of the four-way valve is connected to the outdoor heat exchanger, and the fourth port of the four-way valve is connected to the air outlet of the compressor.

By controlling the connection of the four ports of the four-way valve, the different circulation routes of the refrigerant in the cooling mode and the heating mode of the system are controlled.

Optionally, a gas-liquid separator is also included, and the gas-liquid separator is provided on the pipeline connecting the second interface of the four-way valve and the air inlet of the compressor.

The gas-liquid separator can prevent the compressor's air intake from sucking in liquid refrigerant to cause liquid hammer damage to the compressor, and further protect the compressor.

Optionally, a fan is provided outside the indoor heat exchanger.

The fan blows the cold air or hot air around the indoor heat exchanger into the room, and implements forced convection to reduce or increase the indoor temperature to achieve the purpose of quickly adjusting the air temperature.

Optionally, the four-way valve is switched by changing the direction to control the system to operate in a cooling mode or a heating mode.

The system realizes the mutual conversion between cooling and heating by changing the flow direction of the refrigerant in the system pipeline through the four-way valve.

Optionally, when the system operates in the refrigeration mode, the fourth port of the four-way valve communicates with the third port of the four-way valve, and the first port of the four-way valve communicates with the four-way valve. The second port of the valve is in communication.

Realize the route circulation of the refrigerant in the cooling mode of the system.

Optionally, when the system operates in the heating mode, the first interface of the four-way valve communicates with the fourth interface of the four-way valve, and the third interface of the four-way valve communicates with the four-way valve. The second port of the through valve communicates.

Realize the route circulation of the refrigerant in the heating mode of the system.

Compared with the prior art, the bidirectional throttling system of the present invention has the following advantages:

In the bidirectional throttling system of the present invention, when the cooling and heating modes are different, and the refrigerant circulation directions of the system are different, the cooling expansion valve and the heating expansion valve are more suitable for matching the cooling and heating separately, so as to achieve a more accurate control.

An air conditioner includes the bidirectional throttling system as described above.

Compared with the prior art, the air conditioner and the bidirectional throttle system have the same advantages, which will not be repeated here.

Description of drawings

Fig. 1 is the structural schematic diagram of the expansion valve assembly according to the utility model;

Fig. 2 is the bidirectional throttling system structure schematic diagram of the utility model;

3 is a schematic diagram of the refrigerant cycle of the bidirectional throttling system according to the present invention in a refrigeration mode;

4 is a schematic diagram of the refrigerant cycle of the bidirectional throttling system according to the present invention in a heating mode.

Description of reference numbers:

1. First check valve, 2. Second check valve, 3. Heating expansion valve, 4. Fourth check valve, 5. Third check valve, 6. Refrigeration expansion valve, 7. Compressor, 71 , Air inlet, 72, Air outlet, 8, Outdoor heat exchanger, 9, Indoor heat exchanger, 10, Fan, 11, Liquid reservoir, 12, Filter drier, 13, Four-way valve, 131, First Interface, 132, second interface, 133, third interface, 134, fourth interface, 14, gas-liquid separator.

Detailed ways

The use of heat pump air conditioners for heating in winter and cooling in summer is an energy-saving air conditioner. At present, common heat pump air conditioners are divided into air-cooled heat pump air conditioners and air conditioners according to the cooling method of the condenser. Small heat pump units with stable conditions and relatively small cooling and heating capacity are basically air-cooled heat pumps with capillary throttling, while for medium and large units with large differences in cooling capacity and heating capacity, water-cooled heat pump units with expansion valve throttling are basically used. main.

The expansion valve selection is generally based on whether the evaporator load fluctuates greatly (small fluctuation is configured according to 130% evaporator load, and large fluctuation is configured according to 170% evaporator load.) This also fully shows that the load fluctuation has a great influence on the selection of expansion valve. , when the difference between the cooling capacity and the heating capacity is large, if the expansion valve is selected according to the heating capacity, the expansion valve may cause liquid in the suction due to excessive cooling during operation, and the unit is prone to liquid shock; if the expansion valve is selected according to the cooling capacity If the expansion valve is used for heating, the suction superheat may be too large due to the relatively small size, the heat exchange area of the evaporator cannot be effectively utilized, and the compressor suction superheat will increase to a certain extent, etc. All in all, when choosing an expansion valve, whether to choose according to cooling or heating needs to be considered very carefully. Often, the selected expansion valve takes into account both heating and cooling effects. When the cooling capacity and heating capacity are very different, is very difficult.

In order to make the above objects, features and advantages of the present utility model more clearly understood, the specific embodiments of the present utility model are described in detail below with reference to the accompanying drawings.

As shown in FIG. 1 , an expansion valve assembly consists of a first check valve 1 , a second check valve 2 , a heating expansion valve 3 , a fourth check valve 4 , and a third check valve 5 and the refrigeration expansion valve 6 are formed in series with each other end to end.

When operating in the cooling mode, the refrigerant flows through the fourth one-way valve 4, the first one-way valve 1 and the refrigeration expansion valve 6, and is supplied to the indoor heat exchanger 9, and the refrigerant is passed through the third one-way valve 5 and the first one-way valve 5. Two one-way valve 2 reverse cut-off. When operating in the heating mode, the refrigerant flows through the third check valve 5 , the second check valve 2 and the heating expansion valve 3 , and is supplied to the outdoor heat exchanger 8 , and the refrigerant is passed through the fourth check valve 4 and the heating expansion valve 3 . The first one-way valve 1 is reversely blocked. The refrigeration expansion valve 6 and the heating expansion valve 3 are thermal expansion valves or electronic expansion valves, and the combined structure remains unchanged.

The electronic expansion valve or thermal expansion valve is controlled according to the superheat degree of the intake air. The intake pipe of the compressor 7 is provided with an intake air temperature sensor and a pressure sensor, which are used to sense the intake air temperature and the intake air pressure respectively. The measured intake air temperature and intake pressure are used to calculate the actual degree of superheat, and compare it with the set degree of superheat, and perform PID operation to adjust and control the valve opening of the electronic expansion valve or thermal expansion valve, so as to make the intake air The degree of superheat is always controlled within a certain range. For an air-conditioning system using a dry evaporator, the range of the degree of superheat is generally set to be between 4 and 10°C. Electronic expansion valve or thermal expansion valve adopts intake superheat control, wide adjustment range and high precision, which can be applied to air conditioning systems with fixed capacity and variable capacity compressors, and can be used in the working condition of the lowest ambient temperature of -30℃ To achieve normal heating operation.

This solution uses an expansion valve assembly to realize the independent selection and operation of the heating expansion valve and the cooling expansion valve. When the required cooling capacity and heating capacity are quite different, a more matching cooling can be selected for the cooling and heating operation modes. Expansion valve and heating expansion valve to achieve more precise adjustment of cooling and heating.

As shown in FIG. 2 , a two-way throttling system includes the above-mentioned expansion valve assembly, and the expansion valve assembly is connected with other components of the two-way throttling system through a three-way valve. It also includes a compressor 7, an outdoor heat exchanger 8 and an indoor heat exchanger 9. The components are connected by pipelines, and the liquid refrigerant circulates in the pipelines. The outdoor heat exchanger 8 is used as an evaporator when the two-way throttle system operates in heating mode, and as a condenser when the two-way throttle system operates in a cooling mode, and the indoor heat exchanger 9 The two-way throttle system is used as an evaporator when the two-way throttle system is operating in cooling mode, and as a condenser when the two-way throttle system is operating in heating mode. The indoor heat exchanger 9 and the outdoor heat exchanger 8 may be a plate heat exchanger, a shell and tube heat exchanger or a casing heat exchanger. One end of the indoor heat exchanger 9 is connected to the pipeline between the refrigeration expansion valve 6 and the third one-way valve 5. Specifically, one end of the indoor heat exchanger 9 is connected through a T-shaped three-way connection. On the pipeline between the refrigeration expansion valve 6 and the third one-way valve 5, the other end of the indoor heat exchanger 9 is connected to the compressor 7, and one end of the outdoor heat exchanger 8 is connected On the pipeline between the heating expansion valve 3 and the fourth one-way valve 4, specifically, one end of the outdoor heat exchanger 8 is connected to the heating expansion valve 3 and the On the pipeline between the fourth one-way valve 4, the other end of the outdoor heat exchanger 8 is connected to the compressor 7. By setting the expansion valve assembly, the refrigerant in the cooling mode or the heating mode of the system can be respectively Different routes are used for cyclic operation, so that more matching cooling expansion valve and heating expansion valve can be selected for the cooling and heating operation modes, so as to achieve more precise adjustment of cooling and heating.

It also includes an accumulator 11, one end of the accumulator 11 is connected to the pipeline between the third one-way valve 5 and the fourth one-way valve 4, specifically, one end of the accumulator 11 passes through The T-shaped three-way is connected to the pipeline between the third one-way valve 5 and the fourth one-way valve 4, and the other end of the accumulator 11 is connected to the first one-way valve 1 and the fourth one-way valve 4. On the pipeline between the two one-way valves 2, specifically, the other end of the accumulator 11 is connected between the first one-way valve 1 and the second one-way valve 2 through a T-shaped three-way On the pipeline, the accumulator 11 can store the refrigerant and continuously supply the refrigerant to the indoor heat exchanger or the outdoor heat exchanger. During the operation of the air-conditioning system, it cannot be guaranteed that the refrigerant can be completely vaporized; The refrigerant will enter the liquid refrigerant into the accumulator. Since the liquid refrigerant that is not vaporized is heavier than the gas, it will fall directly to the bottom of the accumulator cylinder, and the vaporized refrigerant will enter the compression from the outlet of the accumulator. This prevents the compressor from sucking in liquid refrigerant and causing liquid shock. In addition, in other embodiments, according to actual use requirements, an air-conditioning system with a larger capacity needs to be provided with a liquid accumulator, an air-conditioning system with a cooling capacity of less than 30KW may not be provided with a liquid accumulator, and the gas-liquid air-conditioning system of an air-conditioning system without a liquid accumulator The volume of the separator needs to be designed to be slightly larger.

The liquid accumulator 11 is connected to the pipeline between the first one-way valve 1 and the second one-way valve 2 and is also provided with a drying filter 12, and the drying filter 12 is used to collect the refrigeration system and refrigerant. The solid impurities in the system can be prevented from blocking the system and the expansion valve, ensuring the smooth flow of the pipeline system and improving the service life of the system.

It also includes a four-way valve 13, the first port 131 of the four-way valve 13 is connected to the indoor heat exchanger 9, the second port 132 of the four-way valve 13 is connected to the air inlet 71 of the compressor 7 connection, the third interface 133 of the four-way valve 13 is connected to the outdoor heat exchanger 8, and the fourth interface 134 of the four-way valve 13 is connected to the air outlet 72 of the compressor 7, by controlling the four-way The connection of the four ports of the valve 13, and then control the different circulation routes of the refrigerant in the cooling mode and the heating mode of the system.

Also includes a gas-liquid separator 14, the gas-liquid separator 14 is arranged on the pipeline connecting the second interface 132 of the four-way valve 13 and the air inlet 71 of the compressor 7, and the gas-liquid separator 14 can Prevent the compressor 7 from being sucked into the liquid refrigerant by the intake port of the compressor 7 to cause liquid hammer damage to the compressor 7, and further protect the compressor 7.

The outer side of the indoor heat exchanger 9 is provided with a fan 10, and the fan 10 blows the cold air or hot air around the indoor heat exchanger into the room, and implements forced convection, so that the indoor temperature is lowered or raised, so as to quickly adjust the air temperature. Purpose.

The four-way valve 13 controls the system to operate in cooling mode or heating mode by changing the direction, and the system changes the flow direction of the refrigerant in the system pipeline through the four-way valve to realize the mutual conversion between cooling and heating .

When the system operates in the cooling mode, the fourth port 134 of the four-way valve 13 communicates with the third port 133 of the four-way valve 13 , and the first port 131 of the four-way valve 13 communicates with the The second port 132 of the four-way valve 13 is connected to realize the route circulation of the refrigerant in the cooling mode of the system.

When the system operates in the heating mode, the first port 131 of the four-way valve 13 communicates with the fourth port 134 of the four-way valve 13 , and the third port 133 of the four-way valve 13 communicates with the four-way valve 13 . The second interface 132 of the four-way valve 13 is connected to realize the route circulation of the refrigerant in the heating mode of the system.

As shown in FIG. 4 , when the system operates in the heating mode, the refrigerant becomes a high-temperature and high-pressure gas under the action of the compressor 7 and flows through the fourth port 134 and the first port 131 of the four-way valve 13 to enter the indoor heat exchange The heat exchanger 9, which condenses and releases heat to heat the indoor air, is cooled to a medium temperature and high pressure liquid, flows out of the indoor heat exchanger 9, and enters the accumulator 11 through the third one-way valve 5, and then enters the drying filter 12, and then passes through The second one-way valve 2 enters the heating expansion valve 3, and becomes a low-temperature and low-pressure liquid, which enters the outdoor heat exchanger 8. By evaporating and absorbing heat in the outdoor heat exchanger 8, it becomes a medium-temperature and low-pressure gas, and then passes through the four-way valve successively. The third interface 133 and the second interface 132 of 13, and the gas-liquid separator 14 enter the compressor 7, and thus circulate to complete the indoor heating function.

As shown in FIG. 3 , when the system operates in the cooling mode, the refrigerant becomes high temperature and high pressure gas under the action of the compressor 7 and enters the outdoor heat exchanger through the fourth port 134 and the third port 133 of the four-way valve 13 8. The condensation heat is absorbed by the liquid water around the outdoor heat exchanger 8, and it is cooled into a medium-temperature and high-pressure liquid, which flows out of the outdoor heat exchanger 8, and enters the accumulator 11 through the fourth check valve 4, and then enters the The filter 12 is dried, and then enters the refrigeration expansion valve 6 through the first one-way valve 1, and becomes a low-temperature and low-pressure liquid into the indoor heat exchanger 9, and becomes a medium-temperature and low-pressure gas by evaporating and absorbing heat in the indoor heat exchanger 9. , and then enter the compressor 7 through the first interface 131 , the second interface 132 and the gas-liquid separator 14 of the four-way valve 13 successively, so as to circulate and complete the indoor refrigeration function.

The above refrigeration expansion and heating expansion valves are independent of each other and do not interfere with each other. When selecting the type, the refrigeration thermal expansion valve is selected according to the indoor evaporating temperature in the cooling mode, the outdoor condensation temperature, the required cooling capacity, and the pressure difference between the inlet and outlet of the expansion valve; The heating expansion valve is selected according to the indoor condensing temperature, outdoor evaporating temperature, required heating capacity, and the pressure difference between the inlet and outlet of the expansion valve in the heating mode. valve and heating expansion valve for more precise control.

An air conditioner includes the bidirectional throttling system as described above.

Although the present invention is disclosed above, the present invention is not limited thereto. Any person skilled in the art can make various changes and modifications without departing from the spirit and scope of the present invention. Therefore, the protection scope of the present invention should be based on the scope defined by the claims.

Claims (12)

1. An expansion valve assembly, comprising: the heating expansion valve comprises a first check valve (1), a second check valve (2), a heating expansion valve (3), a fourth check valve (4), a third check valve (5) and a refrigerating expansion valve (6) which are connected in series.

2. An expansion valve assembly according to claim 1, wherein the refrigeration expansion valve (6) and the heating expansion valve (3) are thermostatic expansion valves or electronic expansion valves.

3. A two-way throttle system, comprising an expansion valve assembly as claimed in any one of claims 1-2, further comprising a compressor (7), an outdoor heat exchanger (8) and an indoor heat exchanger (9), all of which are connected by pipelines, wherein one end of the indoor heat exchanger (9) is connected to the pipeline between the refrigeration expansion valve (6) and the third check valve (5), the other end of the indoor heat exchanger (9) is connected to the compressor (7), one end of the outdoor heat exchanger (8) is connected to the pipeline between the heating expansion valve (3) and the fourth check valve (4), and the other end of the outdoor heat exchanger (8) is connected to the compressor (7).

4. A two-way throttling system according to claim 3, further comprising a reservoir (11), one end of said reservoir (11) being connected to the line between the third one-way valve (5) and the fourth one-way valve (4), the other end of said reservoir (11) being connected to the line between the first one-way valve (1) and the second one-way valve (2).

5. The two-way throttling system according to claim 4, characterized in that the reservoir (11) is further provided with a dry filter (12) in a line connecting between the first one-way valve (1) and the second one-way valve (2).

6. The two-way throttle system of claim 3, further comprising a four-way valve (13), wherein a first port (131) of the four-way valve (13) is connected to the indoor heat exchanger (9), a second port (132) of the four-way valve (13) is connected to the air inlet (71) of the compressor (7), a third port (133) of the four-way valve (13) is connected to the outdoor heat exchanger (8), and a fourth port (134) of the four-way valve (13) is connected to the air outlet (72) of the compressor (7).

7. The two-way throttle system according to claim 6, characterized by further comprising a gas-liquid separator (14), said gas-liquid separator (14) being disposed on a line connecting the second connection port (132) of said four-way valve (13) and the air inlet (71) of said compressor (7).

8. A bi-directional throttling system according to claim 3, characterized in that a fan (10) is provided outside said indoor heat exchanger (9).

9. The bidirectional throttling system of claim 6, wherein the four-way valve (13) controls the system to operate in a cooling mode or a heating mode by direction change switching.

10. The two-way throttle system of claim 9, wherein when the system is operating in the cooling mode, the fourth port (134) of the four-way valve (13) is in communication with the third port (133) of the four-way valve (13), and the first port (131) of the four-way valve (13) is in communication with the second port (132) of the four-way valve (13).

11. The two-way throttle system of claim 9, wherein when the system is operating in the heating mode, the first port (131) of the four-way valve (13) is in communication with the fourth port (134) of the four-way valve (13), and the third port (133) of the four-way valve (13) is in communication with the second port (132) of the four-way valve (13).

12. An air conditioner characterized by comprising the bidirectional throttle system as set forth in any one of claims 3 to 11.

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