Air conditioning system

Abstract

The utility model relates to the technical field of air conditioners, in particular to an air conditioning system. The utility model aims to solve the problem of low refrigeration efficiency caused by reverse flow of an injection loop during low-load operation of an existing refrigeration system. In order to achieve the purpose, the air conditioning system comprises a compressor, an ejector, a first indoor heat exchanger, a second indoor heat exchanger, a first valve body, a first throttling device and other components. Under the condition that the technical scheme is adopted, when the air conditioning system operates at low load, the first valve body and the second throttling device can control a refrigerant not to flow through the ejector and the first indoor heat exchanger, but to directly flow into the second indoor heat exchanger for refrigeration, and then the refrigerant returns into the compressor for the next refrigeration cycle; coolant backflow on an injection loop caused by insufficient pressure difference between an air inlet and an air outlet of the ejector during low-load operation is prevented, and therefore the refrigeration efficiency is guaranteed.

Description

Technical Field

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

[0002] As a household appliance with a high frequency of use, variable frequency air conditioners can achieve precise temperature control, keep the indoor temperature stable, avoid excessive temperature fluctuations and energy waste, and provide a more comfortable indoor environment. At the same time, in order to further improve the cooling effect and energy efficiency, ejectors are also used in air conditioning systems. The ejectors spray the refrigerant at high speed and expand it. In this process, heat absorption effect is generated to achieve cooling effect.

[0003] When the indoor environment tends to be stable, the air-conditioning system will start to operate at low load to reduce energy consumption. At this time, the amount of refrigerant in the air-conditioning system will decrease, which may cause the pressure difference between the air inlet and exhaust port of the ejector to decrease. The ejector port cannot normally inhale the refrigerant gas. At this time, the ejection circuit may flow backwards, causing the ejector to fail to operate normally and the cooling efficiency of the air-conditioning system to decrease.

[0004] Accordingly, the art needs a new technical solution to solve the above problems. Utility Model Content

[0005] In order to solve at least one of the above problems in the prior art, that is, to solve the problem of low refrigeration efficiency caused by reverse flow of the ejector circuit when the existing refrigeration system is running at low load, the present application provides an air conditioning system, which includes:

[0006] compressor;

[0007] an outdoor heat exchanger, wherein a first port of the outdoor heat exchanger is in communication with an exhaust port of the compressor;

[0008] a first valve body, wherein a first port of the first valve body is in communication with a second port of the outdoor heat exchanger;

[0009] an injector, wherein an air inlet of the injector is in communication with a second port of the first valve body;

[0010] a first throttling device, wherein a first port of the first throttling device is in communication with a second port of the outdoor heat exchanger;

[0011] a first indoor heat exchanger, wherein a first port of the first indoor heat exchanger is in communication with an exhaust port of the ejector;

[0012] a second indoor heat exchanger, wherein a first port of the second indoor heat exchanger is respectively connected to the ejection port of the ejector and the second port of the first throttling device;

[0013] a gas-liquid separator, wherein an air inlet of the gas-liquid separator is communicated with the second port of the first indoor heat exchanger, and an exhaust port of the gas-liquid separator is communicated with an air intake port of the compressor;

[0014] A second throttling device, wherein a first port of the second throttling device is communicated with a liquid discharge port of the gas-liquid separator, and a second port of the second throttling device is communicated with a second port of the second indoor heat exchanger.

[0015] When the above technical solution is adopted, when the air-conditioning system is operating normally, there is a sufficient pressure difference between the air inlet and the exhaust port of the ejector to allow the liquid refrigerant to circulate between the first indoor heat exchanger and the second indoor heat exchanger. When the air-conditioning system is operating at a low load, the system is abnormal and the ejection circuit flows backward. At this time, the first valve body and the second throttling device can control the refrigerant not to flow through the ejector and the first indoor heat exchanger, but to flow directly into the second indoor heat exchanger for cooling and then return to the compressor for the next refrigeration cycle, thereby preventing the refrigerant in the ejection circuit from flowing backward due to insufficient pressure difference between the air inlet and the exhaust port of the ejector during low load operation, thereby ensuring refrigeration efficiency.

[0016] In a preferred technical solution of the above-mentioned air-conditioning system, the first port of the first throttling device is connected to the pipeline between the first port of the first valve body and the second port of the outdoor heat exchanger.

[0017] In a preferred technical solution of the above-mentioned air-conditioning system, the second port of the first throttling device is connected to the pipeline between the injection port of the ejector and the first port of the second indoor heat exchanger.

[0018] In a preferred technical solution of the above air-conditioning system, the first valve body is configured as a solenoid valve or an electronic expansion valve.

[0019] In the preferred technical solution of the above-mentioned air-conditioning system, the first valve body is configured as a three-way valve, and the first port, the second port and the third port of the three-way valve are respectively connected to the second port of the outdoor heat exchanger, the air inlet of the ejector and the first port of the second indoor heat exchanger.

[0020] In the preferred technical solution of the above air conditioning system,

[0021] The first port and the second port of the first throttling device are respectively connected to the second port of the outdoor heat exchanger and the first port of the three-way valve, or

[0022] The first port and the second port of the first throttling device are respectively communicated with the third port of the three-way valve and the first port of the second indoor heat exchanger.

[0023] In a preferred technical solution of the above air-conditioning system, the first throttling device and / or the second throttling device is configured as an electronic expansion valve.

[0024] When the above technical solution is adopted, the first throttling device and the second throttling device can adjust the amount of refrigerant in the pipeline while achieving throttling and pressure reduction.

[0025] In the preferred technical solution of the above-mentioned air-conditioning system, the air-conditioning system also includes a four-way valve, and the first interface, the second interface, the third interface and the fourth interface of the four-way valve are respectively connected to the exhaust port of the compressor, the first port of the outdoor heat exchanger, the intake port of the compressor and the exhaust port of the gas-liquid separator.

[0026] When the above technical solution is adopted, the cooling and heating modes of the air-conditioning system can be quickly switched through the four-way valve, while the internal structure of the air-conditioning system is simplified.

[0027] In the preferred technical solution of the above-mentioned air-conditioning system, the air-conditioning system also includes a regenerator, and the first inlet, the first outlet, the second inlet and the second outlet of the regenerator are respectively connected to the second port of the outdoor heat exchanger, the first port of the first valve body, the exhaust port of the gas-liquid separator and the intake port of the compressor.

[0028] When the above technical solution is adopted, through the heat exchange of the refrigerants on both sides inside the regenerator, on the one hand, the refrigerant flowing to the indoor heat exchanger can be cooled, and on the other hand, the refrigerant returning to the compressor can be heated, thereby improving the refrigeration efficiency and reducing the working intensity of the air conditioner.

[0029] In the preferred technical solution of the above air-conditioning system, the refrigerant used in the air-conditioning system is CO2.

[0030] When the above technical solution is adopted, CO2 as a refrigerant will not cause harm to the environment and its heating performance is outstanding. BRIEF DESCRIPTION OF THE DRAWINGS

[0031] The air conditioning system of the present application is described below with reference to the accompanying drawings. In the accompanying drawings:

[0032] Figure 1 A schematic diagram of the air conditioning system of the present application.

[0033] Reference numerals list

[0034] 10. Compressor; 20. Four-way valve; 21. First interface; 22. Second interface; 23. Third interface; 24. Fourth interface; 30. Outdoor heat exchanger; 40. Regenerator; 41. First inlet; 42. First outlet; 43. Second inlet; 44. Second outlet; 50. First valve body; 60. Ejector; 61. Air inlet; 62. Injection port; 63. Exhaust port; 71. First indoor heat exchanger; 72. Second indoor heat exchanger; 81. First throttling device; 82. Second throttling device; 90. Gas-liquid separator. DETAILED DESCRIPTION

[0035] The preferred embodiments of the present application are described below with reference to the accompanying drawings. It should be understood by those skilled in the art that these embodiments are only used to explain the technical principles of the present application and are not intended to limit the scope of protection of the present application. For example, although the first valve body in the accompanying drawings is introduced in combination with a solenoid valve, this is not intended to limit the scope of protection of the present application. Without departing from the principles of the present application, those skilled in the art can modify it as needed. For example, the first valve body is set as a three-way valve.

[0036] It should be noted that in the description of the present application, the terms "upper", "lower", "left", "right", "inner", "outer" and the like indicating directions or positional relationships are based on the directions or positional relationships shown in the drawings, which are only for the convenience of description, and do not indicate or imply that the device or element must have a specific orientation, be constructed and operated in a specific orientation, and therefore cannot be understood as limiting the present application. In addition, the terms "first" and "second" are used for descriptive purposes only, and cannot be understood as indicating or implying relative importance.

[0037] In addition, it should be noted that in the description of this application, unless otherwise clearly specified and limited, the terms "installed", "connected", and "connected" should be understood in a broad sense, for example, it can be a fixed connection, a detachable connection, or an integral connection; it can be a direct connection, or an indirect connection through an intermediate medium, or it can be the internal communication of two components. For those skilled in the art, the specific meanings of the above terms in this application can be understood according to the specific circumstances.

[0038] As a household appliance with a high frequency of use, variable frequency air conditioners can achieve precise temperature control, keep the indoor temperature stable, avoid excessive temperature fluctuations and energy waste, and provide a more comfortable indoor environment. At the same time, in order to further improve the cooling effect and energy efficiency, ejectors are also used in air conditioning systems. The ejectors spray the refrigerant at high speed and expand it. In this process, heat absorption effect is generated to achieve cooling effect.

[0039] When the indoor environment tends to be stable, the air-conditioning system will start to operate at low load to reduce energy consumption. At this time, the amount of refrigerant in the air-conditioning system will decrease, which may cause the pressure difference between the air inlet and exhaust port of the ejector to decrease. The ejector port cannot normally inhale the refrigerant gas. At this time, the ejection circuit may flow backwards, causing the ejector to fail to operate normally and the cooling efficiency of the air-conditioning system to decrease.

[0040] In order to solve the problem of low refrigeration efficiency caused by backflow of the injection circuit when the existing refrigeration system is running at low load, the present application provides an air-conditioning refrigeration system, which includes: a compressor; an outdoor heat exchanger, a first port of the outdoor heat exchanger is connected to the exhaust port of the compressor; a first valve body, a first port of the first valve body is connected to the second port of the outdoor heat exchanger; an ejector, an air inlet of the ejector is connected to the second port of the first valve body; a first throttling device, a first port of the first throttling device is connected to the second port of the outdoor heat exchanger; a first indoor heat exchanger, a first port of the first indoor heat exchanger is connected to the exhaust port of the ejector; a second indoor heat exchanger, a first port of the second indoor heat exchanger is respectively connected to the injection port of the ejector and the second port of the first throttling device; a gas-liquid separator, an air inlet of the gas-liquid separator is connected to the second port of the first indoor heat exchanger, and the exhaust port of the gas-liquid separator is connected to the air intake port of the compressor; a second throttling device, a first port of the second throttling device is connected to the discharge port of the gas-liquid separator, and the second port of the second throttling device is connected to the second port of the second indoor heat exchanger.

[0041] When the above technical solution is adopted, when the air-conditioning system is operating normally, there is a sufficient pressure difference between the air inlet and the exhaust port of the ejector to allow the liquid refrigerant to circulate between the first indoor heat exchanger and the second indoor heat exchanger. When the air-conditioning system is operating at a low load, the system is abnormal and the ejection circuit flows backward. At this time, the first valve body and the second throttling device can control the refrigerant not to flow through the ejector and the first indoor heat exchanger, but to flow directly into the second indoor heat exchanger for cooling and then return to the compressor for the next refrigeration cycle, thereby preventing the refrigerant in the ejection circuit from flowing backward due to insufficient pressure difference between the air inlet and the exhaust port of the ejector during low load operation, thereby ensuring refrigeration efficiency.

[0042] Refer to the following Figure 1 To describe the air conditioning system of this application, Figure 1 A schematic diagram of the air conditioning system of the present application.

[0043] like Figure 1As shown, in a preferred embodiment, the air conditioning system includes a compressor 10, a four-way valve 20, an outdoor heat exchanger 30, a regenerator 40, a first valve body 50, an ejector 60, a first indoor heat exchanger 71, a second indoor heat exchanger 72, a first throttling device 81, a second throttling device 82, and a gas-liquid separator 90. Among them, the first interface 21, the second interface 22, the third interface 23 and the fourth interface 24 of the four-way valve 20 are respectively connected to the exhaust port of the compressor 10, the first port of the outdoor heat exchanger 30, the air intake port of the compressor 10 and the second outlet 44 of the regenerator 40. The second port of the outdoor heat exchanger 30 is communicated with the first inlet 41 of the regenerator 40, the first port of the first valve body 50 is communicated with the first outlet 42 of the regenerator 40, the air inlet 61, the injection port 62 and the exhaust port 63 of the ejector 60 are respectively communicated with the second port of the first valve body 50, the first port of the second indoor heat exchanger 72 and the first port of the first indoor heat exchanger 71, the first port of the first throttling device 81 is communicated with the first outlet 42 of the regenerator 40 and the first port of the first valve body 50, the second port of the first throttling device 81 is communicated with the pipeline between the first outlet 42 of the regenerator 40 and the first port of the first valve body 50, the second port of the first throttling device 81 is communicated with the pipeline between the injection port 62 of the ejector 60 and the first port of the second indoor heat exchanger 72, the air inlet, the drain port and the exhaust port of the gas-liquid separator 90 are respectively communicated with the second port of the first indoor heat exchanger 71, the second port of the second indoor heat exchanger 72 and the second inlet 43 of the regenerator 40, and the second throttling device 82 is located between the drain port of the gas-liquid separator 90 and the second port of the second indoor heat exchanger 72. Preferably, the first valve body 50 is configured as a solenoid valve, and the first throttling device 81 and the second throttling device 82 are both configured as electronic expansion valves. A first heat exchange channel is formed between the first inlet 41 and the first outlet 42 of the regenerator 40, and a second heat exchange channel is formed between the second inlet 43 and the second outlet 44 of the regenerator 40, and heat exchange can be achieved between the first heat exchange channel and the second heat exchange channel.

[0044] It should be explained that when the air-conditioning system operates normally in the cooling mode, the first interface 21 on the four-way valve 20 is connected to the second interface 22, the third interface 23 is connected to the fourth interface 24, the first valve body 50 is in an open state, the first throttling device 81 is in a closed state, and the second throttling device 82 is opened to a certain opening. At this time, the compressor 10 compresses the refrigerant into a high-temperature and high-pressure refrigerant gas, and then the refrigerant enters the outdoor heat exchanger 30 through the four-way valve 20 and is cooled to become a normal temperature and high-pressure refrigerant gas, and then enters the first heat exchange channel through the first inlet 41 of the regenerator 40 and flows out from the first outlet 42 after exchanging temperature and cooling with the refrigerant in the second heat exchange channel, and then the refrigerant flows through the first valve body 50 and enters the ejector 60 as a power fluid. At the same time, the ejector 60 inhales the refrigerant gas generated by the heat exchange of the second indoor heat exchanger 72, and the gas-liquid two-phase refrigerant is mixed and then passes through the ejector 60. It is sprayed to the first indoor heat exchanger 71, where the refrigerant absorbs indoor heat and vaporizes. Since the heat exchange of the refrigerant may be insufficient, the mixed refrigerant enters the gas-liquid separator 90. The separated gaseous refrigerant passes through the second inlet 43, the second outlet 44 and the four-way valve 20 of the regenerator 40 and returns to the compressor 10. The separated liquid refrigerant enters the second indoor heat exchanger 72 after throttling and reducing the pressure through the second throttling device 82 to continue heat exchange. The refrigerant after heat exchange is sucked into the injection port 62 of the ejector 60, and the refrigeration is completed by this reciprocating cycle.

[0045] When the air conditioning system is in cooling mode and running at low load, the pressure difference between the air inlet 61 and the air outlet 63 of the ejector 60 decreases, and the refrigerant is ejected from the ejection port 62, causing system abnormality. At this time, the first valve body 50 is controlled to be in a closed state, the first throttling device 81 is opened to a certain opening, and the second throttling device 82 is fully opened. Figure 1 As indicated by the arrows in the figure, the refrigerant discharged from the compressor 10 flows through the four-way valve 20, the outdoor heat exchanger 30, the first inlet 41 and the first outlet 42 of the regenerator 40 in sequence, and then does not enter the ejector 60, but directly enters the second indoor heat exchanger 72 for heat exchange after throttling and reducing the pressure through the first throttling device 81, and then enters the gas-liquid separator 90 through the second throttling device 82. After the refrigerant flows out of the gas-liquid separator 90, it passes through the second inlet 43, the second outlet 44 and the four-way valve 20 of the regenerator 40 and returns to the compressor 10. This avoids the insufficient pressure difference between the air inlet 61 and the exhaust port 63 of the ejector 60 during low-load operation, and the inability of the ejector port 62 to normally absorb the refrigerant flowing out of the second indoor heat exchanger 72. At this time, the first throttling device 81 replaces the ejector 60 to throttle, reduce the pressure and temperature of the refrigerant, and the first throttling device 81 can also adjust the opening, so that the air-conditioning system can ensure the best performance state during normal operation and low-load operation, and improve the refrigeration efficiency.

[0046] When the air conditioning system operates normally in the heating mode, the four-way valve 20 is reversed (not shown in the figure), the first interface 21 is connected to the fourth interface 24, the second interface 22 is connected to the third interface 23, the first valve body 50 is in a closed state, and the first throttling device 81 and the second throttling device 82 are in a fully open state. The compressor 10 compresses the refrigerant into a high-temperature and high-pressure refrigerant gas, and then the refrigerant gas passes through the four-way valve 20, the second outlet 44 and the second inlet 43 of the regenerator 40 and enters the gas-liquid separator 90. At this time, the gas-liquid separator does not play a role in gas-liquid separation, and then the refrigerant passes through the second throttling device 82 to enter the second indoor heat exchanger 72 to heat the indoor air. After the heat exchange is completed, the refrigerant passes through the throttling and pressure reduction of the first throttling device 81, the first outlet 42 and the first inlet 41 of the regenerator 40, the outdoor heat exchanger 30 and the four-way valve 20 in turn and returns to the compressor 10.

[0047] It is understood by those skilled in the art that the specific settings of the first valve body 50 and the first throttling device 81 are not fixed, and those skilled in the art can modify them as needed, as long as they do not affect the normal function. In an alternative embodiment, the first valve body 50 can be configured as an electrically controlled butterfly valve, an electrically controlled ball valve, an electronic expansion valve or other electrically controlled valves, and the first throttling device 81 can be configured as a throttling tube. In another alternative embodiment, the two ends of the first throttling device 81 may not be connected to the pipeline, in which case the first port of the first throttling device 81 can be directly connected to the first outlet 42 of the regenerator 40, and the second port of the first throttling device 81 can be directly connected to the first port of the second indoor heat exchanger 72. In another alternative embodiment, the first valve body 50 is set as a three-way valve, the first throttling device 81 is set as an electronic expansion valve, and the first port, the second port and the third port of the three-way valve are respectively connected to the first outlet 42 of the regenerator 40, the air inlet 61 of the ejector 60 and the first port of the second indoor heat exchanger 72. At this time, the first throttling device 81 can be set between the first outlet 42 of the regenerator 40 and the first port of the three-way valve, or can be set between the third port of the three-way valve and the first port of the second indoor heat exchanger 72, both of which can play the role of throttling, reducing the pressure and cooling the refrigerant passing through the second indoor heat exchanger 72 during low-load operation.

[0048] It can also be understood by those skilled in the art that the setting of the four-way valve 20 is not fixed. In an alternative embodiment, the four-way valve 20 may not be set. In this case, two three-way valves may be set, one three-way valve is used to connect the exhaust port of the compressor 10, the first port of the outdoor heat exchanger 30 and the second outlet 44 of the regenerator 40, and the other three-way valve is used to connect the air intake port of the compressor 10, the first port of the outdoor heat exchanger 30 and the second outlet 44 of the regenerator 40. However, considering the simplification of the internal structure of the air-conditioning system and the rapid switching of the air-conditioning working mode, setting the four-way valve 20 is a better choice. In addition, the regenerator 40 can also be omitted. In this case, the first port of the first valve body 50 is directly connected to the second port of the outdoor heat exchanger 30, and the exhaust port of the gas-liquid separator 90 is connected to the air intake port of the compressor 10. In addition, in this embodiment, the refrigerant used in the air-conditioning system is CO2. As a new generation of clean refrigerant, CO2 is non-toxic and harmless, has good environmental performance, and has outstanding heating performance, but its setting is not fixed, and those skilled in the art can replace other refrigerants according to needs.

[0049] Those skilled in the art will appreciate that, although some embodiments described herein include certain features included in other embodiments but not other features, the combination of features of different embodiments is meant to be within the scope of the present application and form different embodiments. For example, in the claims of the present application, any one of the claimed embodiments may be used in any combination.

[0050] So far, the technical solutions of the present application have been described in conjunction with the preferred embodiments shown in the accompanying drawings. However, it is easy for those skilled in the art to understand that the protection scope of the present application is obviously not limited to these specific embodiments. Without departing from the principles of the present application, those skilled in the art can make equivalent changes or substitutions to the relevant technical features, and the technical solutions after these changes or substitutions will fall within the protection scope of the present application.

Claims

1. An air conditioning system, characterized in that: The air conditioning system comprises: compressor; an outdoor heat exchanger, wherein a first port of the outdoor heat exchanger is in communication with an exhaust port of the compressor; a first valve body, wherein a first port of the first valve body is in communication with a second port of the outdoor heat exchanger; an injector, wherein an air inlet of the injector is in communication with a second port of the first valve body; a first throttling device, wherein a first port of the first throttling device is in communication with a second port of the outdoor heat exchanger; a first indoor heat exchanger, wherein a first port of the first indoor heat exchanger is in communication with an exhaust port of the ejector; a second indoor heat exchanger, wherein a first port of the second indoor heat exchanger is respectively connected to the ejection port of the ejector and the second port of the first throttling device; a gas-liquid separator, wherein an air inlet of the gas-liquid separator is communicated with the second port of the first indoor heat exchanger, and an exhaust port of the gas-liquid separator is communicated with an air intake port of the compressor; A second throttling device, wherein a first port of the second throttling device is communicated with a liquid discharge port of the gas-liquid separator, and a second port of the second throttling device is communicated with a second port of the second indoor heat exchanger.

2. The air conditioning system according to claim 1, characterized in that: The first port of the first throttling device is communicated with the pipeline between the first port of the first valve body and the second port of the outdoor heat exchanger.

3. The air conditioning system according to claim 1, characterized in that: The second port of the first throttling device is connected to the pipeline between the injection port of the ejector and the first port of the second indoor heat exchanger.

4. The air conditioning system according to claim 1, characterized in that: The first valve body is configured as a solenoid valve or an electronic expansion valve.

5. The air conditioning system according to claim 1, characterized in that: The first valve body is configured as a three-way valve, a first port, a second port and a third port of the three-way valve are respectively connected to the second port of the outdoor heat exchanger, the air inlet of the ejector and the first port of the second indoor heat exchanger.

6. The air conditioning system according to claim 5, characterized in that: The first port and the second port of the first throttling device are respectively connected to the second port of the outdoor heat exchanger and the first port of the three-way valve, or The first port and the second port of the first throttling device are respectively communicated with the third port of the three-way valve and the first port of the second indoor heat exchanger.

7. The air conditioning system according to claim 1, characterized in that: The first throttling device and / or the second throttling device is configured as an electronic expansion valve.

8. The air conditioning system according to claim 1, characterized in that: The air conditioning system also includes a four-way valve, a first interface, a second interface, a third interface and a fourth interface of the four-way valve are respectively connected to the exhaust port of the compressor, the first port of the outdoor heat exchanger, the air intake port of the compressor and the exhaust port of the gas-liquid separator.

9. The air conditioning system according to claim 1, characterized in that: The air conditioning system also includes a regenerator, a first inlet, a first outlet, a second inlet and a second outlet of the regenerator are respectively connected to the second port of the outdoor heat exchanger, the first port of the first valve body, the exhaust port of the gas-liquid separator and the intake port of the compressor.

10. The air conditioning system according to claim 1, characterized in that: The refrigerant used in the air-conditioning system is CO2.

Images