Control system for stabilizing system pressure and temperature

Abstract

The utility model discloses a control system for stabilizing system pressure and temperature, relates to the technical field of air-conditioning systems, and can solve the problems that the exhaust temperature is high when the air-conditioning system performs refrigeration at a higher temperature and the suction pressure of the system is low when the air-conditioning system performs heating at a low temperature. A control system for stabilizing system pressure and temperature comprises a compressor, a four-way valve, an indoor heat exchanger, a first electronic expansion valve, an outdoor heat exchanger, a gas-liquid separator and a balance pipeline. The balance pipeline is connected with the low-pressure side and other areas of the air conditioning system and used for balancing the input temperature of the compressor. By means of the balance pipeline, when the exhaust temperature is high, a part of condensed refrigerant is led to the low-pressure side of the system, the air suction refrigerant amount of the compressor is increased, and when low-temperature heating is conducted and the air suction pressure of the system is low, a part of compressor is led to exhaust to the low-pressure side of the system, the air suction pressure is increased, the compression ratio of the system is reduced, and the air suction refrigerant amount of the compressor is increased.

Description

Technical Field

[0001] The utility model relates to the technical field of air-conditioning systems, and in particular to a control system for stabilizing system pressure and temperature. Background Art

[0002] In the field of air conditioning, when cooling at higher temperatures, the compressor frequency is often high, and the suction temperature is high, resulting in high exhaust temperature, which easily carbonizes the compressor lubricant and shortens the service life of the compressor.

[0003] During low-temperature heating, due to the low outside ambient temperature, the refrigerant evaporation amount is small, the system suction pressure is low, and there is less refrigerant on the suction side of the compressor, resulting in less exhaust refrigerant, high exhaust temperature, poor heating effect, and shortened compressor service life. Utility Model Content

[0004] The purpose of the utility model is to solve at least one of the technical problems existing in the prior art and to provide a control system for stabilizing system pressure and temperature, which can solve the problem of high exhaust temperature when the air-conditioning system is cooling at a high temperature, and the problem of low system suction pressure when heating at a low temperature.

[0005] According to a first aspect of the utility model, a control system for stabilizing system pressure and temperature is provided, comprising a compressor, a four-way valve, an indoor heat exchanger, a first electronic expansion valve, an outdoor heat exchanger and a gas-liquid separator; when the four-way valve is switched to a cooling mode, the output end of the compressor is connected to the outdoor heat exchanger through the four-way valve, the output end of the outdoor heat exchanger is connected to the indoor heat exchanger, the output end of the indoor heat exchanger is connected to the gas-liquid separator through another pipeline output end of the four-way valve after being connected to the four-way valve, and the gas-liquid separator is connected to the input end of the compressor; when the four-way valve is switched to a heating mode, the output end of the compressor is connected to the indoor heat exchanger through the four-way valve, the output end of the indoor heat exchanger is connected to the outdoor heat exchanger, the output end of the outdoor heat exchanger is connected to the four-way valve after being connected to the gas-liquid separator through another pipeline output end of the four-way valve, and the gas-liquid separator is connected to the input end of the compressor; and a balancing pipeline is also included, the balancing pipeline is connected to the low-pressure side and other areas of the air-conditioning system, and is used to balance the input temperature of the compressor.

[0006] According to a control system for stabilizing system pressure and temperature according to an embodiment of the utility model, there are at least the following beneficial effects: a control system for stabilizing system pressure and temperature includes a compressor, a four-way valve, an indoor heat exchanger, a first electronic expansion valve, an outdoor heat exchanger, a gas-liquid separator and a balancing pipeline. The balancing pipeline connects the low-pressure side and other areas of the air-conditioning system to balance the input temperature of the compressor. Through the balancing pipeline, when the exhaust temperature is high, a part of the condensed refrigerant can be introduced to the low-pressure side of the system, the compressor suction refrigerant amount can be increased, the exhaust temperature can be reduced, and the service life of the compressor can be increased. During low-temperature heating, when the system suction pressure is low, a part of the compressor exhaust can be introduced to the low-pressure side of the system, the suction pressure can be increased, the system compression ratio can be reduced, the compressor suction refrigerant amount can be increased, and the compressor exhaust refrigerant amount can also be increased, the heating effect can be enhanced, the exhaust temperature can be reduced, and the service life of the compressor can be increased.

[0007] According to a control system for stabilizing system pressure and temperature described in the utility model, the balance pipeline includes: a refrigeration balance pipe and a heating balance pipe. In the air-conditioning refrigeration mode, the refrigeration balance pipe can lead a part of the cooled refrigerant into the low-pressure side of the system to increase the amount of refrigerant sucked by the compressor. In the air-conditioning heating mode, the heating balance pipe can lead a part of the compressor exhaust into the low-pressure side of the system to increase the amount of refrigerant sucked by the compressor and reduce the pressure difference between the suction and exhaust of the compressor.

[0008] According to a control system for stabilizing system pressure and temperature described in the utility model, one end of the refrigeration balance pipe is connected between the outdoor heat exchanger and the indoor heat exchanger, and the other end is connected between the four-way valve and the gas-liquid separator.

[0009] According to a control system for stabilizing system pressure and temperature described in the utility model, a first solenoid valve and a second electronic expansion valve are also provided on the refrigeration balance pipe, and the first electronic expansion valve is close to the gas-liquid separator.

[0010] According to a control system for stabilizing system pressure and temperature described in the utility model, one end of the heating balance pipe is connected between the four-way valve and the output end of the compressor, and the other end is connected between the first solenoid valve and the first electronic expansion valve. A second solenoid valve is also provided on the heating balance pipe.

[0011] According to a control system for stabilizing system pressure and temperature described in the utility model, the balancing pipeline also includes an exhaust temperature sensing package and an exhaust pressure sensor, and the flow of the refrigeration balancing pipe or the heating balancing pipe is regulated by feedback data from the exhaust temperature sensing package and the exhaust pressure sensor.

[0012] Additional aspects and advantages of the present invention will be given in part in the following description, and in part will become apparent from the following description, or will be learned through the practice of the present invention. BRIEF DESCRIPTION OF THE DRAWINGS

[0013] The utility model is further described below in conjunction with the accompanying drawings and embodiments;

[0014] Figure 1 This is a schematic diagram of the structure of the refrigeration cycle of a preferred embodiment of the utility model;

[0015] Figure 2 It is a structural schematic diagram of a heating cycle in a preferred embodiment of the utility model. DETAILED DESCRIPTION

[0016] This section will describe in detail the specific embodiments of the utility model. The preferred embodiments of the utility model are shown in the accompanying drawings. The purpose of the accompanying drawings is to supplement the description of the text part of the specification with graphics, so that people can intuitively and vividly understand each technical feature and the overall technical solution of the utility model, but it cannot be understood as a limitation on the protection scope of the utility model.

[0017] In the description of the present invention, it should be understood that descriptions involving orientation, such as up, down, front, back, left, right, etc., indicating orientations or positional relationships, are based on the orientations or positional relationships shown in the accompanying drawings, and are only for the convenience of describing the present invention and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and therefore cannot be understood as a limitation on the present invention.

[0018] In the description of the present utility model, "several" means one or more, "more" means more than two, "greater than", "less than", "exceed" etc. are understood to exclude the number itself, and "above", "below", "within" etc. are understood to include the number itself. If there is a description of "first" or "second", it is only used for the purpose of distinguishing the technical features, and cannot be understood as indicating or implying the relative importance or implicitly indicating the number of the indicated technical features or implicitly indicating the order of the indicated technical features.

[0019] In the description of the present invention, unless otherwise clearly defined, terms such as setting, installing, connecting, etc. should be understood in a broad sense, and technicians in the relevant technical field can reasonably determine the specific meanings of the above terms in the present invention based on the specific content of the technical solution.

[0020] Reference Figure 1 and Figure 2 A control system for stabilizing system pressure and temperature includes a compressor 10, a four-way valve 20, an indoor heat exchanger 30, a first electronic expansion valve 40, an outdoor heat exchanger 50 and a gas-liquid separator 60.

[0021] When the four-way valve 20 is switched to the cooling mode, the output end of the compressor 10 is connected to the outdoor heat exchanger 50 through the four-way valve 20. The output end of the outdoor heat exchanger 50 is connected to the indoor heat exchanger 30. The output end of the indoor heat exchanger 30 is connected to the gas-liquid separator 60 through another pipeline output end of the four-way valve 20 after being connected to the four-way valve 20. The gas-liquid separator 60 is connected to the input end of the compressor 10.

[0022] When the four-way valve 20 is switched to the heating mode, the output end of the compressor 10 is connected to the indoor heat exchanger 30 through the four-way valve 20. The output end of the indoor heat exchanger 30 is connected to the outdoor heat exchanger 50. The output end of the outdoor heat exchanger 50 is connected to the gas-liquid separator 60 through another pipeline output end of the four-way valve 20 after being connected to the four-way valve 20. The gas-liquid separator 60 is connected to the input end of the compressor 10.

[0023] The balance line 70 is also included. The balance line 70 connects the low-pressure side of the air conditioning system and other areas to balance the input temperature of the compressor 10.

[0024] It should be noted that in the embodiment of the present utility model, in the cooling mode, the section of the pipeline from the output end of the indoor heat exchanger 30 to the four-way valve 20, then to the gas-liquid separator 60 and finally back to the input end of the compressor 10 is the low-pressure side of the system.

[0025] In the heating mode, the section of the pipeline from the output end of the outdoor heat exchanger 50 to the four-way valve 20, then to the gas-liquid separator 60 and finally back to the input end of the compressor 10 is the low-pressure side of the system.

[0026] It can be understood that, through the balancing pipeline 70, when the exhaust temperature is high, a part of the condensed refrigerant can be led to the low-pressure side of the system, thereby increasing the amount of refrigerant inhaled by the compressor 10, reducing the exhaust temperature, and increasing the service life of the compressor. During low-temperature heating, when the system suction pressure is low, a part of the compressor 10 exhaust is led to the low-pressure side of the system, thereby increasing the suction pressure, reducing the system compression ratio, increasing the amount of refrigerant inhaled by the compressor 10, and also increasing the amount of refrigerant exhausted by the compressor, thereby enhancing the heating effect, reducing the exhaust temperature, and increasing the service life of the compressor.

[0027] Reference Figure 1 and Figure 2 The balance pipeline 70 includes: a cooling balance pipe 71 and a heating balance pipe 72. In the air conditioning cooling mode, the cooling balance pipe 71 can lead a part of the cooled refrigerant into the low-pressure side of the system to increase the amount of refrigerant sucked by the compressor 10. In the air conditioning heating mode, the heating balance pipe 72 can lead a part of the exhaust gas of the compressor 10 into the low-pressure side of the system to increase the amount of refrigerant sucked by the compressor 10 and reduce the suction and exhaust pressure difference of the compressor 10.

[0028] Reference Figure 1One end of the refrigeration balance pipe 71 is connected between the outdoor heat exchanger 50 and the indoor heat exchanger 30 , and the other end is connected between the four-way valve 20 and the gas-liquid separator 60 .

[0029] It can be understood that the input end of the refrigeration balance pipe 71 is connected between the outdoor heat exchanger 50 and the indoor heat exchanger 30, and the other end is connected between the four-way valve 20 and the gas-liquid separator 60, so that a part of the condensed refrigerant can be introduced into the low-pressure side, thereby increasing the intake refrigerant amount of the compressor 10 and extending the service life of the compressor 10.

[0030] Reference Figure 1 A first solenoid valve 711 and a second electronic expansion valve 712 are also provided on the refrigeration balance pipe 71 , and the second electronic expansion valve 712 is close to the gas-liquid separator 60 .

[0031] It is worth noting that the first solenoid valve 711 can control the opening or closing of the refrigeration balance pipe 71 , and the second electronic expansion valve 712 can control the flow of the refrigeration balance pipe 71 .

[0032] Reference Figure 2 One end of the heating balance pipe 72 is connected between the four-way valve 20 and the output end of the compressor 10, and the other end is connected between the first solenoid valve 711 and the second electronic expansion valve 712. A second solenoid valve 721 is also provided on the heating balance pipe 72.

[0033] It is worth noting that during low-temperature heating, when the system suction pressure is low, a part of the exhaust gas of the compressor 10 is led to the low-pressure side of the system to increase the suction pressure, reduce the system compression ratio, increase the compressor suction refrigerant volume, and also increase the compressor exhaust refrigerant volume, thereby enhancing the heating effect, reducing the exhaust temperature, and increasing the service life of the compressor.

[0034] Reference Figure 1 and Figure 2 The balance pipeline 70 also includes an exhaust temperature sensing package 73 and an exhaust pressure sensor 74 , and the flow rate of the cooling balance pipe 71 or the heating balance pipe 72 is adjusted by feedback data from the exhaust temperature sensing package 73 and the exhaust pressure sensor 74 .

[0035] It is worth noting that in some embodiments of the present invention, the exhaust temperature and the exhaust pressure are detected by the exhaust temperature sensing package 73 and the exhaust pressure sensor 74, thereby regulating the flow of the cooling balance pipe 71 or the heating balance pipe 72 to protect the compressor 10 and extend the service life of the compressor 10.

[0036] The embodiments of the present invention are described in detail above in conjunction with the accompanying drawings, but the present invention is not limited to the above embodiments. Various changes can be made within the knowledge scope of ordinary technicians in the technical field without departing from the purpose of the present invention.

Claims

1. A control system for stabilizing system pressure and temperature, characterized in that: include: A compressor (10), a four-way valve (20), an indoor heat exchanger (30), a first electronic expansion valve (40), an outdoor heat exchanger (50), and a gas-liquid separator (60); When the four-way valve (20) is switched to a cooling mode, the output end of the compressor (10) is connected to the outdoor heat exchanger (50) through the four-way valve (20), the output end of the outdoor heat exchanger (50) is connected to the indoor heat exchanger (30), the output end of the indoor heat exchanger (30) is connected to the gas-liquid separator (60) through another pipeline output end of the four-way valve (20), and the gas-liquid separator (60) is connected to the input end of the compressor (10); When the four-way valve (20) is switched to a heating mode, the output end of the compressor (10) is connected to the indoor heat exchanger (30) through the four-way valve (20), the output end of the indoor heat exchanger (30) is connected to the outdoor heat exchanger (50), the output end of the outdoor heat exchanger (50) is connected to the gas-liquid separator (60) through another pipeline output end of the four-way valve (20), and the gas-liquid separator (60) is connected to the input end of the compressor (10); It also includes a balancing pipeline (70), which connects the low-pressure side and other areas of the air-conditioning system and is used to balance the input temperature of the compressor (10).

2. A control system for stabilizing system pressure and temperature according to claim 1, characterized in that: The balance pipeline (70) includes: a cooling balance pipe (71) and a heating balance pipe (72). In the air conditioning cooling mode, the cooling balance pipe (71) can lead a portion of the cooled refrigerant into the low-pressure side of the system to increase the amount of refrigerant sucked by the compressor (10). In the air conditioning heating mode, the heating balance pipe (72) can lead a portion of the exhaust gas of the compressor (10) into the low-pressure side of the system to increase the amount of refrigerant sucked by the compressor (10) and reduce the difference in suction and exhaust pressures of the compressor (10).

3. A control system for stabilizing system pressure and temperature according to claim 2, characterized in that: One end of the refrigeration balance pipe (71) is connected between the outdoor heat exchanger (50) and the indoor heat exchanger (30), and the other end is connected between the four-way valve (20) and the gas-liquid separator (60).

4. A control system for stabilizing system pressure and temperature according to claim 3, characterized in that: The refrigeration balance pipe (71) is also provided with a first solenoid valve (711) and a second electronic expansion valve (712), and the second electronic expansion valve (712) is close to the gas-liquid separator (60).

5. A control system for stabilizing system pressure and temperature according to claim 4, characterized in that: One end of the heating balance pipe (72) is connected between the four-way valve (20) and the output end of the compressor (10), and the other end is connected between the first solenoid valve (711) and the second electronic expansion valve (712). A second solenoid valve (721) is also provided on the heating balance pipe (72).

6. A control system for stabilizing system pressure and temperature according to claim 2, characterized in that: The balance pipeline (70) further comprises an exhaust temperature sensing package (73) and an exhaust pressure sensor (74), and the flow rate of the cooling balance pipe (71) or the heating balance pipe (72) is adjusted by feedback data from the exhaust temperature sensing package (73) and the exhaust pressure sensor (74).

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