Air conditioning system

Abstract

The invention provides an air conditioning system. The air conditioning system comprises a compressor, a first reversing valve, a first heat exchanger, a second reversing valve, a gas-liquid separator and a second heat exchanger. The first end of the first reversing valve is connected with the exhaust end of the compressor, and the second end of the first reversing valve is connected with the air inlet end of the compressor; the first end of the first heat exchanger is connected with the third end of the first reversing valve; the first end of the second heat exchanger is connected with the fourth end of the first reversing valve; the second end of the first heat exchanger is connected with the first end of the second reversing valve, and the second end of the second heat exchanger is connected with the second end of the second reversing valve; the first end of the gas-liquid separator is connected with the third end of the second reversing valve, and the second end of the gas-liquid separator is connected with the fourth end of the second reversing valve; and the third end of the gas-liquid separator is connected with the gas supply end of the compressor. By controlling the first reversing valve and the second reversing valve, air supply and enthalpy increase can be conducted when the air conditioning system achieves the heating or refrigerating function, and the energy efficiency of the air conditioning system is improved.

Description

Technical Field

[0001] The present invention relates to the technical field of air conditioning, and in particular to an air conditioning system. Background Art

[0002] In the field of refrigeration and air conditioning, the application of air-injection and re-enthalpy air conditioning systems has achieved an increase in heating capacity and COP (Coefficient Of Performance) under low-temperature conditions, while reducing the exhaust temperature of the compressor, allowing the compressor to operate under more extreme conditions. Figure 1 As shown, it includes a compressor 10', a condenser 20', a first throttling device 30', a gas-liquid separator 40', a second throttling device 50', a gas-supplementing valve 60' and an evaporator 70', wherein the gas-supplementing valve 60' is used to adjust the gas-supplementing flow rate. The refrigerant discharged from the exhaust end of the compressor 10' passes through the first throttling device 30' and enters the gas-liquid separator 40' after heat exchange in the condenser 20', and the liquid refrigerant discharged from the liquid phase outlet of the gas-liquid separator 40' enters the evaporator 70' after throttling by the second throttling device 50', and the refrigerant discharged from the outlet of the evaporator 70' returns to the air intake of the compressor 10'; and the gas refrigerant discharged from the gas phase outlet of the gas-liquid separator 40' returns to the gas-supplementing end of the compressor 10' after passing through the gas-supplementing valve 60', completing the cycle.

[0003] In fact, the above-mentioned traditional air-supply enthalpy-increasing air-conditioning system is mostly used for heating conditions, and cannot realize the switching between cooling mode and heating mode like a conventional heat pump air conditioner.

[0004] It should be noted that the information disclosed in the above background technology section is only used to enhance the understanding of the background of the present invention, and therefore may include information that does not constitute the prior art known to those skilled in the art. Summary of the invention

[0005] In view of the problems in the prior art, the object of the present invention is to provide an air-conditioning system that can realize cooling and heating functions, and can increase air enthalpy when cooling and heating, thereby improving the working energy efficiency of the air-conditioning system.

[0006] An embodiment of the present invention provides an air conditioning system, comprising:

[0007] A compressor, including an exhaust end, an intake end and a supply end;

[0008] a first reversing valve, wherein a first end of the first reversing valve is connected to an exhaust end of the compressor, and a second end of the first reversing valve is connected to an intake end of the compressor;

[0009] a first heat exchanger, wherein a first end of the first heat exchanger is connected to a third end of the first reversing valve;

[0010] a second heat exchanger, wherein a first end of the second heat exchanger is connected to a fourth end of the first reversing valve;

[0011] a second reversing valve, wherein the second end of the first heat exchanger is connected to the first end of the second reversing valve, and the second end of the second heat exchanger is connected to the second end of the second reversing valve;

[0012] A gas-liquid separator, wherein the first end of the gas-liquid separator is connected to the third end of the second reversing valve, the second end of the gas-liquid separator is connected to the fourth end of the second reversing valve; the third end of the gas-liquid separator is connected to the gas supply end;

[0013] By controlling the first reversing valve and the second reversing valve to be in the first state, the system operates in the first operating mode;

[0014] The system operates in the second working mode by controlling the first reversing valve and the second reversing valve to be in the second state.

[0015] In some embodiments, a gas supply valve is further included, which is located between the gas supply end and the third end of the gas-liquid separator.

[0016] In some embodiments, the first reversing valve and the second reversing valve are four-way valves.

[0017] In some embodiments, in the first working mode, the first end and the third end of the first reversing valve are connected, and the second end and the fourth end of the first reversing valve are connected;

[0018] The first end and the third end of the second reversing valve are connected, and the second end and the fourth end of the second reversing valve are connected.

[0019] In some embodiments, in the second working mode, the first end and the fourth end of the first reversing valve are connected, and the second end and the third end of the first reversing valve are connected;

[0020] The first end and the fourth end of the second reversing valve are connected, and the second end and the third end of the second reversing valve are connected.

[0021] In some embodiments, the throttling device includes a first throttling device and a second throttling device, wherein the first throttling device is located between the first heat exchanger and the second reversing valve; and the second throttling device is located between the second heat exchanger and the second reversing valve.

[0022] In some embodiments, the first throttling device and the second throttling device are electronic expansion valves.

[0023] In some embodiments, the air supply valve is a flow regulating valve or a solenoid valve.

[0024] In some embodiments, the first heat exchanger is located indoors and the second heat exchanger is located outdoors.

[0025] In some embodiments, a controller is further included to control the communication between the first reversing valve and the second reversing valve.

[0026] The invention provides the following advantages:

[0027] The present invention uses a first reversing valve to enable the air-conditioning system to switch between heating and cooling functions. Combined with the second reversing valve, air replenishment and enthalpy increase can be achieved during heating and cooling, thereby improving the working energy efficiency of the air-conditioning system during cooling and heating, and reducing the exhaust temperature of the compressor. BRIEF DESCRIPTION OF THE DRAWINGS

[0028] Other features, objectives and advantages of the present invention will become more apparent from a reading of the detailed description of non-limiting embodiments made with reference to the following accompanying drawings.

[0029] Figure 1 is a schematic diagram of an air conditioning system in the prior art;

[0030] Figure 2 is a schematic diagram of the conduction of an air conditioning system provided by an embodiment of the present invention in a first working mode;

[0031] Figure 3 1 is a schematic diagram of the conduction of an air-conditioning system provided by an embodiment of the present invention in a second working mode.

[0032] Reference numerals:

[0033] 10' The fourth end of the compressor 2d in the prior art

[0034] 20' Condenser 3 first heat exchanger in the prior art

[0035] 30' The first throttling device 4 in the prior art The second heat exchanger

[0036] 40' Second reversing valve of gas-liquid separator 5 in the prior art

[0037] 50' The first end of the second throttling device 5a in the prior art

[0038] 60' The second end of the air supply valve 5b in the prior art

[0039] 70' The third end of the evaporator 5c in the prior art

[0040] 1 Compressor 5d Fourth end

[0041] 1a Inlet end 6 Gas-liquid separator

[0042] 1b Exhaust end 6a First end

[0043] 1c Air supply end 6b Second end

[0044] 2 The third end of the first reversing valve 6c

[0045] 2a First end 7 Air supply valve

[0046] 2b Second end 8 First throttle valve

[0047] 2c Third end 9 Second throttle valve DETAILED DESCRIPTION

[0048] Example embodiments will now be described more fully with reference to the accompanying drawings. However, example embodiments can be implemented in a variety of forms and should not be construed as limited to the embodiments set forth herein; rather, these embodiments are provided so that the present invention will be comprehensive and complete and fully convey the concepts of the example embodiments to those skilled in the art. In the figures, the same reference numerals represent the same or similar structures, and thus their repeated description will be omitted. "or" and "or" in the specification may both mean "and" or "or".

[0049] To solve the problems in the prior art, an embodiment of the present invention provides an air-conditioning system, including: a compressor, including an exhaust end, an intake end and an air supply end; a first reversing valve, wherein the first end of the first reversing valve is connected to the exhaust end of the compressor, and the second end of the first reversing valve is connected to the intake end of the compressor; a first heat exchanger, wherein the first end of the first heat exchanger is connected to the third end of the first reversing valve; a second heat exchanger, wherein the first end of the second heat exchanger is connected to the fourth end of the first reversing valve; a second reversing valve, wherein the second end of the first heat exchanger is connected to the first end of the second reversing valve, and the second end of the second heat exchanger is connected to the second end of the second reversing valve; a gas-liquid separator, wherein the first end of the gas-liquid separator is connected to the third end of the second reversing valve, and the second end of the gas-liquid separator is connected to the fourth end of the second reversing valve; and the third end of the gas-liquid separator is connected to the air supply end. The present invention controls the first reversing valve and the second reversing valve in the first state so that the air conditioning system works in the first working mode; controls the first reversing valve and the second reversing valve in the second state so that the air conditioning system works in the second working mode, so that air replenishment and enthalpy increase can be achieved in both the first working mode and the second working mode, thereby improving the working efficiency of the air conditioning system. Here, the first working mode refers to the heating mode, and the second working mode refers to the cooling mode.

[0050] The air conditioning system of the present invention is further described below in conjunction with the accompanying drawings and specific embodiments. It should be understood that the various specific embodiments are not intended to limit the protection scope of the present invention.

[0051] like Figure 2 and Figure 3 As shown, the air conditioning system includes a compressor 1 , a first reversing valve 2 , a first heat exchanger 3 , a second heat exchanger 4 , a second reversing valve 5 and a gas-liquid separator 6 .

[0052] Specifically, the compressor 1 includes an intake end 1a, an exhaust end 1b and an air supply end 1c. The first end 2a of the first reversing valve 2 is connected to the exhaust end 1b of the compressor 1, and the second end 2b of the first reversing valve 2 is connected to the intake end 1a of the compressor 1. The first end of the first heat exchanger 3 is connected to the third end 2c of the first reversing valve 2; the second end of the first heat exchanger 3 is connected to the first end 5a of the second reversing valve 5. The first end of the second heat exchanger 4 is connected to the fourth end 2d of the first reversing valve 2; the second end of the second heat exchanger 4 is connected to the second end 5b of the second reversing valve 5. The first end 6a of the gas-liquid separator 6 is connected to the third end 5c of the second reversing valve 5, the second end 6b of the gas-liquid separator 6 is connected to the fourth end 5d of the second reversing valve 5; the third end 6c of the gas-liquid separator 6 is connected to the air supply end 1c.

[0053] Specifically, the air conditioning system further includes an air supply valve 7, which is located between the air supply end 1c and the third end 6c of the gas-liquid separator 6. Whether to supply air to the compressor 1 can be controlled by controlling the conduction and closing of the air supply valve 7; the air supply amount can also be adjusted by adjusting the opening of the air supply valve. In some embodiments, the air supply valve 7 can be a flow regulating device such as a flow regulating valve, or a simple on-off control valve such as a solenoid valve, which is not specifically limited.

[0054] Specifically, the first reversing valve 2 and the second reversing valve 5 are four-way valves. The four-way valve can adopt the four-way valve products in the prior art, and there is no need to develop corresponding equipment and products separately, which has cost advantages. The pressure drop of the four-way valve is small, the pressure drop loss of the refrigerant during transmission is small, and the impact on the performance of the air-conditioning system is small.

[0055] Further, in some embodiments, the first heat exchanger 3 is located indoors, and the second heat exchanger 4 is located outdoors.

[0056] Specifically, in the first working mode (heating mode), the first end 2a and the third end 2c of the first reversing valve 2 are connected, and the second end 2b and the fourth end 2d of the first reversing valve 2 are connected; the first end 5a and the third end 5c of the second reversing valve 5 are connected, and the second end 5b and the fourth end 5d of the second reversing valve 5 are connected. In the second working mode (cooling mode), the first end 2a and the fourth end 2d of the first reversing valve 2 are connected, and the second end 2b and the third end 2c of the first reversing valve 2 are connected; the first end 5a and the fourth end 5d of the second reversing valve 5 are connected, and the second end 5b and the third end 5c of the second reversing valve 5 are connected.

[0057] By setting the first reversing valve 2, the air conditioning system can switch between the heating and cooling working modes. By setting the second reversing valve 5, the air replenishment and enthalpy increase function can be achieved in both the heating and cooling working modes, thereby improving the working efficiency of the air conditioning system and reducing the exhaust temperature of the compressor.

[0058] The air conditioning system also includes a controller (not shown in the figure) for controlling the connection between the first reversing valve and the second reversing valve to achieve the above-mentioned cooling and heating modes. Different from the design of the stop valve and the bypass pipe, the valve component used can automatically control the state of the reversing valve through the controller to control the conduction and closing between the components. The switching process does not require manual operation, has a high degree of automation, and is easy to use.

[0059] Further, the throttling device includes a first throttling device 8 and a second throttling device 9, wherein the first throttling device 8 is located between the first heat exchanger 3 and the second reversing valve 5; and the second throttling device 9 is located between the second heat exchanger 4 and the second reversing valve 5. The first throttling device 8 and the second throttling device 9 can be electronic expansion valves. The electronic expansion valve has the functions of regulating flow, controlling overheating, and throttling and reducing pressure. However, the throttling device includes but is not limited to the electronic expansion valve.

[0060] The specific working principle of the air conditioning system is introduced below.

[0061] When the air-conditioning system is controlled to operate in the first working mode (heating), the second end 2b and the fourth end 2d of the first reversing valve 2 are connected, and the first end 2a and the third end 2c of the first reversing valve 2 are connected; the first end 5a and the third end 5c of the second reversing valve 5 are connected, the second end 5b and the fourth end 5d of the second reversing valve 5 are connected, the air supply valve 7 is connected, and the first throttling device 8 and the second throttling device 9 are connected.

[0062] Correspondingly, the refrigerant compressed inside the compressor 1 enters the first reversing valve 2 from the exhaust end 1b, and enters the first heat exchanger 3 through the first end 2a and the third end 2c of the first reversing valve 2; after heat exchange in the first heat exchanger 3, it enters the second reversing valve 5 after being cooled and reduced in pressure by the first throttling device 8; enters the gas-liquid separator 6 through the first end 5a and the third end 5c of the second reversing valve 5 for gas-liquid separation; a part of the liquid refrigerant after gas-liquid separation enters the second reversing valve 5 again through the second end 6b of the gas-liquid separator 6; after passing through the fourth end 5d and the second end 5b of the second reversing valve 5, it is cooled and reduced in pressure again by the second throttling device 9, and then enters the second heat exchanger 4; after heat exchange in the second heat exchanger 4, it enters the first reversing valve 2 again, enters the compressor 1 through the fourth end 2d and the second end 2b of the first reversing valve 2, and re-enters the compressor 1 through the intake end 1a for compression. Another part of the gas refrigerant in the gas-liquid separator 6 directly enters the compressor 1 through the third end 6c of the gas-liquid separator 6 and the air supply end 1c of the compressor 1, mixes with the medium-pressure gas refrigerant generated after re-entering the compressor 1 through the air inlet end 1a for compression, and is further compressed and discharged through the exhaust end 1b to complete the cycle.

[0063] Furthermore, when the air-conditioning system is controlled to operate in the second working mode (cooling), the second end 2b and the third end 2c of the first reversing valve 2 are connected, and the first end 2a and the fourth end 2d of the first reversing valve 2 are connected; the second end 5b and the third end 5c of the second reversing valve 5 are connected, and the first end 5a and the fourth end 5d of the second reversing valve 5 are connected.

[0064] Correspondingly, the refrigerant compressed by the compressor 1 is discharged from the exhaust end 1b, enters the second heat exchanger 4 through the first end 2a and the fourth end 2d of the first reversing valve 2, and after heat exchange in the second heat exchanger 4, passes through the second throttling device 9, the second end 5b and the third end 5c of the second reversing valve 5, and enters the interior of the gas-liquid separator 6 from the first end 6a of the gas-liquid separator 6 for gas-liquid separation. The gaseous refrigerant after gas-liquid separation can directly replenish gas for the compressor 1 through the third end 6c of the gas-liquid separator 6 and the gas replenishing end 1c of the compressor 1; the liquid refrigerant after gas-liquid separation passes through the second end 6b of the gas-liquid separator 6, the fourth end 5d and the first end 5a of the second reversing valve 5, and then passes through the first throttling device 8 to enter the first heat exchanger 3 for heat exchange. The refrigerant after heat exchange enters the compressor 1 again through the third end 2c, the second end 2b of the first reversing valve 2 and the air inlet end 1a of the compressor for compression, and such a cycle is performed to cool the room.

[0065] In the present invention, the gas and liquid refrigerants are separated by the gas-liquid separator 6, wherein the first refrigerant is a liquid refrigerant, which continues to cool down and reduce pressure through the throttling device, and returns to the air inlet end 1a of the compressor 1 in a relatively low-pressure gas state after heat exchange in the heat exchanger, and forms a medium-pressure gas refrigerant after completing the low-pressure compression in the compressor 1. The second refrigerant is a gaseous refrigerant, which directly returns to the air supply end 1c of the compressor 1 at a relatively high pressure to supply air to the compressor 1, and is further compressed after mixing with the aforementioned medium-pressure gas refrigerant, and then is discharged from the compressor 1 through the exhaust end 1b of the compressor 1, and does not participate in the low-pressure compression process of the first refrigerant.

[0066] The air conditioning system provided by the present invention has the following advantages:

[0067] The present invention uses a first reversing valve to enable the air conditioning system to switch between cooling and heating functions. Combined with the second reversing valve, air replenishment and enthalpy increase can be achieved during cooling and heating, thereby improving the cooling and heating efficiency of the air conditioning system, and at the same time, the exhaust temperature of the compressor can also be reduced.

[0068] The first reversing valve and the second reversing valve can use the existing four-way valve, without the need to develop corresponding equipment and products separately, which has cost advantages. Different from the design of the stop valve and bypass pipe, the valve components used can be driven by the controller, and the switching process does not require manual operation, with a high degree of automation and convenient use. The four-way valve has a small pressure drop, and the pressure drop loss of the refrigerant during transmission is small, which has little impact on system performance.

[0069] The above contents are further detailed descriptions of the present invention in combination with specific preferred embodiments, and it cannot be determined that the specific implementation of the present invention is limited to these descriptions. For ordinary technicians in the technical field to which the present invention belongs, several simple deductions or substitutions can be made without departing from the concept of the present invention, which should be regarded as falling within the protection scope of the present invention.

Claims

1. An air conditioning system, It is characterized in that include: A compressor, including an exhaust end, an intake end and a supply end; a first reversing valve, wherein a first end of the first reversing valve is connected to an exhaust end of the compressor, and a second end of the first reversing valve is connected to an intake end of the compressor; a first heat exchanger, wherein a first end of the first heat exchanger is connected to a third end of the first reversing valve; a second heat exchanger, wherein a first end of the second heat exchanger is connected to a fourth end of the first reversing valve; a second reversing valve, wherein the second end of the first heat exchanger is connected to the first end of the second reversing valve, and the second end of the second heat exchanger is connected to the second end of the second reversing valve; A gas-liquid separator, wherein the first end of the gas-liquid separator is connected to the third end of the second reversing valve, the second end of the gas-liquid separator is connected to the fourth end of the second reversing valve; the third end of the gas-liquid separator is connected to the gas supply end; By controlling the first reversing valve and the second reversing valve to be in the first state, the system operates in the first operating mode; The system operates in the second working mode by controlling the first reversing valve and the second reversing valve to be in the second state.

2. The air conditioning system according to claim 1, It is characterized in that It also includes an air supply valve located between the air supply end and the third end of the gas-liquid separator.

3. The air conditioning system according to claim 1, It is characterized in that The first reversing valve and the second reversing valve are four-way valves.

4. The air conditioning system according to claim 1, It is characterized in that In the first working mode, the first end and the third end of the first reversing valve are connected, and the second end and the fourth end of the first reversing valve are connected; The first end and the third end of the second reversing valve are connected, and the second end and the fourth end of the second reversing valve are connected.

5. The air conditioning system according to claim 1, It is characterized in that In the second working mode, the first end and the fourth end of the first reversing valve are connected, and the second end and the third end of the first reversing valve are connected; The first end and the fourth end of the second reversing valve are connected, and the second end and the third end of the second reversing valve are connected.

6. The air conditioning system according to claim 1, It is characterized in that It also includes a throttling device, which includes a first throttling device and a second throttling device. The first throttling device is located between the first heat exchanger and the second reversing valve; the second throttling device is located between the second heat exchanger and the second reversing valve.

7. The air conditioning system according to claim 6, It is characterized in that The first throttling device and the second throttling device are electronic expansion valves.

8. The air conditioning system according to claim 2, It is characterized in that The air supply valve is a flow regulating valve or a solenoid valve.

9. The air conditioning system according to claim 1, It is characterized in that The first heat exchanger is located indoors, and the second heat exchanger is located outdoors.

10. The air conditioning system according to claim 1, It is characterized in that A controller is also included for controlling the communication between the first reversing valve and the second reversing valve.

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