Air conditioning system with outdoor unit capable of defrosting and heating at same time

Abstract

The utility model discloses an air conditioning system with an outdoor unit capable of defrosting and heating at the same time and a control method, relates to the technical field of air conditioning systems, and can solve the problem of temperature fluctuation caused by stopping heating the indoor environment in the defrosting process. An air conditioning system with an outdoor unit capable of defrosting and heating at the same time comprises a compressor, a four-way valve, an indoor heat exchanger, an outdoor heat exchanger, a gas-liquid separator, a defrosting pressure reduction pipeline and a pipeline control system. And a defrosting heat exchanger is arranged in the frost removal and pressure reduction pipeline. And the outdoor heat exchanger fan tends to enable the air flow to bring the heat of the defrosting heat exchanger to a heat exchange part of the outdoor heat exchanger for defrosting. The pipeline control system comprises a first electronic expansion valve. The first electronic expansion valve is arranged between the indoor heat exchanger and the outdoor heat exchanger and close to the indoor heat exchanger. A part of high-temperature refrigerant output by the compressor can be output to the defrosting heat exchanger to defrost the outdoor heat exchanger in the heating mode through the frost removal and pressure reduction pipeline, and heating does not need to be stopped.

Description

Technical Field

[0001] The utility model relates to the technical field of air-conditioning systems, in particular to an air-conditioning system capable of defrosting an outdoor unit and heating at the same time. Background Art

[0002] Under low temperature and high humidity conditions, with the increase of heating operation time, the thickness of frost on the surface of the outdoor heat exchanger of existing air-conditioning products will gradually increase, and the heating capacity will gradually decay. When it decays to a certain extent, the unit is forced to defrost. During the defrosting process, the heating of the indoor environment will stop, and the indoor temperature will fluctuate accordingly. The longer the defrosting time, the worse the comfort experience.

[0003] With the update and iteration of air-conditioning products, high-temperature refrigeration requires higher operating environment temperature and cooling capacity, and the exhaust pressure can easily rise to the protection point and shut down. 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 an air-conditioning system that can heat while defrosting an outdoor unit, so as to solve the problem of temperature fluctuation caused by stopping heating the indoor environment during the defrosting process.

[0005] According to the first aspect of the utility model, there is provided an air-conditioning system capable of defrosting an outdoor unit and providing heating at the same time, comprising a compressor, a four-way valve, an indoor heat exchanger, an outdoor heat exchanger, a gas-liquid separator and a defrost and pressure-reducing pipeline, wherein one end of the defrost and pressure-reducing pipeline is connected to the output end of the compressor, and the other end is respectively connected to the input end of the outdoor heat exchanger and / or the input end of the gas-liquid separator. During heating, the defrost and pressure-reducing pipeline is used to defrost the outdoor heat exchanger. A defrost heat exchanger is provided in the defrost and pressure-reducing pipeline. The defrost heat exchanger is arranged at the rear side of the outdoor heat exchanger in the direction of wind flow, and a fan of the outdoor heat exchanger causes the air flow to bring the heat of the defrost heat exchanger to the heat exchange components of the outdoor heat exchanger for defrosting. The system also comprises a pipeline control system, which comprises a first electronic expansion valve, which is arranged between the indoor heat exchanger and the outdoor heat exchanger and close to the indoor heat exchanger.

[0006] The utility model has at least the following beneficial effects: an air conditioning system that can defrost an outdoor unit and heat at the same time comprises: a compressor, a four-way valve, an indoor heat exchanger, an outdoor heat exchanger, a gas-liquid separator, a defrost and pressure-reducing pipeline, and a pipeline control system. A defrost heat exchanger is provided in the defrost and pressure-reducing pipeline. The outdoor heat exchanger fan causes the airflow to carry the heat of the defrost heat exchanger to the heat exchange component of the outdoor heat exchanger for defrosting. The pipeline control system comprises a first electronic expansion valve. The first electronic expansion valve is arranged between the indoor heat exchanger and the outdoor heat exchanger and is close to the indoor heat exchanger. Through the defrost and pressure-reducing pipeline, a part of the high-temperature refrigerant output by the compressor can be output to the defrost heat exchanger to defrost the outdoor heat exchanger in the heating mode without stopping the heating.

[0007] According to the first aspect of the utility model, an air-conditioning system with an outdoor unit that can defrost and heat at the same time, the defrost and pressure-reducing pipeline includes a heating defrost pipeline and a cooling pressure-reducing pipeline. When the air conditioner is heating, the heating defrost pipeline can transport part of the high-temperature refrigerant output by the compressor to the defrost heat exchanger to heat the inlet air of the outdoor heat exchange fan. When the air conditioner is cooling, the cooling pressure-reducing pipeline transports part of the high-temperature and high-pressure refrigerant discharged from the compressor to the defrost heat exchanger for condensation and cooling, thereby reducing the exhaust pressure.

[0008] According to the first aspect of the utility model, an air-conditioning system with an outdoor unit that can defrost and heat at the same time, one end of the heating and defrosting pipeline is connected between the output end of the compressor and the input end of the four-way valve, and the other end is connected between the gas-liquid separator and the four-way valve and close to the input end of the gas-liquid separator, and the defrost heat exchanger is arranged on the heating and defrosting pipeline.

[0009] According to the first aspect of the utility model, an air-conditioning system with an outdoor unit that can defrost and heat at the same time, one end of the refrigeration and pressure-reducing pipeline is connected between the output end of the compressor and the input end of the four-way valve, and the other end is connected between the outdoor heat exchanger and the first electronic expansion valve, and the defrost heat exchanger is arranged on the refrigeration and pressure-reducing pipeline.

[0010] According to an air-conditioning system with an outdoor unit that can defrost and heat at the same time as described in the first aspect of the utility model, the pipeline control system also includes a first solenoid valve and a second solenoid valve, the first solenoid valve is arranged between the defrost heat exchanger and the first electronic expansion valve, and the second solenoid valve is arranged between the output end of the defrost heat exchanger and the input end of the gas-liquid separator.

[0011] According to an air-conditioning system with an outdoor unit that defrosts and heats at the same time as described in the first aspect of the utility model, the pipeline control system also includes a second electronic expansion valve, an indoor temperature sensing bag, an outdoor temperature sensing bag, a defrost temperature sensing bag and an exhaust pressure sensor, the second electronic expansion valve is arranged between the output end of the compressor and the input end of the defrost heat exchanger, the indoor temperature sensing bag is arranged on the indoor heat exchanger, the outdoor temperature sensing bag is arranged on the outdoor heat exchanger, the defrost temperature sensing bag is arranged on the heat exchange component of the outdoor heat exchanger, and the exhaust pressure sensor is arranged at the output end of the compressor.

[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 system diagram of the heating mode of the preferred embodiment of the utility model;

[0015] Figure 2 This is a system diagram of the refrigeration mode of the preferred embodiment of the utility model;

[0016] Figure 3 This is a flow chart of the heating mode of a preferred embodiment of the utility model;

[0017] Figure 4 This is a flow chart of the cooling mode of a preferred embodiment of the present utility model.

[0018] Reference numerals:

[0019] Compressor 10, four-way valve 20, indoor heat exchanger 30, outdoor heat exchanger 50, gas-liquid separator 60;

[0020] Defrosting and pressure reducing pipeline 70, defrosting heat exchanger 71, heating and defrosting pipeline 72, refrigeration and pressure reducing pipeline 73;

[0021] Pipeline control system 80 , first electronic expansion valve 81 , first solenoid valve 82 , second solenoid valve 83 , second electronic expansion valve 84 , indoor temperature sensing package 85 , outdoor temperature sensing package 86 , defrost temperature sensing package 87 , exhaust pressure sensor 88 . DETAILED DESCRIPTION

[0022] 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.

[0023] 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.

[0024] 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.

[0025] 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.

[0026] Reference Figures 1 to 4 An air conditioning system capable of defrosting an outdoor unit and heating at the same time comprises: a compressor 10, a four-way valve 20, an indoor heat exchanger 30, an outdoor heat exchanger 50, a gas-liquid separator 60, a defrosting and pressure-reducing pipeline 70 and a pipeline control system 80.

[0027] 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, and the output end of the outdoor heat exchanger 50 is connected to the indoor heat exchanger 30. After the output end of the indoor heat exchanger 30 is connected to the four-way valve 20, it 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;

[0028] 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, and the output end of the indoor heat exchanger 30 is connected to the outdoor heat exchanger 50. After the output end of the outdoor heat exchanger 50 is connected to the four-way valve 20, it 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;

[0029] One end of the defrost pressure-reducing pipeline 70 is connected to the output end of the compressor 10, and the other end is respectively connected to the input end of the outdoor heat exchanger 50 and / or the input end of the gas-liquid separator 60. When heating, the defrost pressure-reducing pipeline 70 is used to defrost the outdoor heat exchanger 50. When cooling, the defrost pressure-reducing pipeline 70 is used to reduce the exhaust pressure. A defrost heat exchanger 71 is provided in the defrost pressure-reducing pipeline 70. The defrost heat exchanger 71 is arranged at the rear side of the outdoor heat exchanger 50 in the wind flow direction. The fan of the outdoor heat exchanger 50 causes the air flow to bring the heat of the defrost heat exchanger 71 to the heat exchange components of the outdoor heat exchanger 50 for defrosting.

[0030] It is worth noting that in embodiment 1 of the present invention, the defrost heat exchanger 71 is arranged between the fan and the heat exchange component of the outdoor heat exchanger 50. The air flow blown out by the fan of the outdoor heat exchanger 50 is heated by the defrost heat exchanger 71 and then blown to the heat exchange component of the outdoor heat exchanger 50 for defrosting.

[0031] In embodiment 2 of the present utility model, the heat exchange component of the outdoor heat exchanger 50 is arranged between the defrost heat exchanger 71 and the fan of the outdoor heat exchanger 50. The fan of the outdoor heat exchanger 50 draws the outside air through the defrost heat exchanger 71 for heating, and then flows through the heat exchange component of the outdoor heat exchanger 50 for defrosting, and finally blows it out through the fan of the outdoor heat exchanger 50.

[0032] The pipeline control system includes a first electronic expansion valve 81. The first electronic expansion valve 81 is disposed between the indoor heat exchanger 30 and the outdoor heat exchanger 50 and is close to the indoor heat exchanger 30.

[0033] It can be understood that, in the heating mode, a portion of the high-temperature refrigerant output by the compressor 10 can be output to the defrost heat exchanger 71 through the defrost pressure-reducing pipeline 70 to defrost the outdoor heat exchanger 50 without stopping heating. In the cooling mode, a portion of the high-temperature and high-pressure refrigerant output by the compressor 10 can be condensed and cooled through the defrost heat exchanger 71 through the defrost pressure-reducing pipeline 70 to reduce the exhaust pressure.

[0034] Reference Figures 1 to 4 The defrosting and depressurizing pipeline 70 includes a heating defrosting pipeline 72 and a cooling depressurizing pipeline 73. When the air conditioner is heating, the heating defrosting pipeline 72 can transport part of the high-temperature refrigerant output by the compressor 10 to the defrosting heat exchanger 71 to heat the inlet air of the outdoor heat exchange fan. When the air conditioner is cooling, the cooling depressurizing pipeline 73 transports part of the high-temperature and high-pressure refrigerant discharged by the compressor 10 to the defrosting heat exchanger 71 for condensation and cooling, thereby reducing the exhaust pressure.

[0035] It can be understood that the heating and defrosting pipeline 72 outputs the high-temperature refrigerant output by the compressor 10 to the defrost heat exchanger 71 to defrost the outdoor heat exchanger 50, so that the outdoor heat exchanger 50 can continue to perform heating work without stopping indoor heating.

[0036] The refrigeration pressure reduction pipeline 73 can transport the high-temperature and high-pressure refrigerant discharged from the compressor 10 to the defrost heat exchanger 71 for condensation and cooling, thereby reducing the exhaust pressure and extending the service life of the compressor 10.

[0037] Reference Figures 1 to 4 One end of the heating and defrosting pipeline 72 is connected between the output end of the compressor 10 and the input end of the four-way valve 20, and the other end is connected between the gas-liquid separator 60 and the four-way valve 20 and close to the input end of the gas-liquid separator 60. The defrosting heat exchanger 71 is arranged on the heating and defrosting pipeline 72.

[0038] Reference Figures 1 to 4 One end of the refrigeration pressure-reducing pipeline 73 is connected between the output end of the compressor 10 and the input end of the four-way valve 20, and the other end is connected between the outdoor heat exchanger 50 and the first electronic expansion valve 81. The defrosting heat exchanger 71 is arranged on the refrigeration pressure-reducing pipeline 73.

[0039] Reference Figures 1 to 4 The pipeline control system 80 further includes a first solenoid valve 82 and a second solenoid valve 83. The first solenoid valve 82 is arranged between the defrost heat exchanger 71 and the first electronic expansion valve 81. The second solenoid valve 83 is arranged between the output end of the defrost heat exchanger 71 and the input end of the gas-liquid separator 60.

[0040] It is understandable that in the embodiment of the present invention, the opening and closing of the heating and defrosting pipeline 72 or the cooling and depressurizing pipeline 73 are controlled by the first solenoid valve 82 and the second solenoid valve 83. Only one of the two is in the open state at the same time in different modes.

[0041] Reference Figures 1 to 4 The pipeline control system 80 also includes a second electronic expansion valve 84, an indoor temperature sensing package 85, an outdoor temperature sensing package 86, a defrosting temperature sensing package 87 and an exhaust pressure sensor 88. The second electronic expansion valve 84 is arranged between the output end of the compressor 10 and the input end of the defrosting heat exchanger 71. The indoor temperature sensing package 85 is arranged on the indoor heat exchanger 30. The outdoor temperature sensing package 86 is arranged on the outdoor heat exchanger 50, and the defrosting temperature sensing package 87 is arranged on the heat exchange component of the outdoor heat exchanger 50. The exhaust pressure sensor 88 is arranged at the output end of the compressor 10.

[0042] It is worth noting that, in some embodiments of the present invention, the flow of the heating and defrosting pipeline 72 or the refrigeration and pressure-reducing pipeline 73 is controlled by the second electronic expansion valve 84 to achieve precise regulation.

[0043] It should be noted that in some embodiments of the present invention, the opening of the second electronic expansion valve 84 is regulated in real time or periodically based on data detected by the indoor temperature sensing package 85 , the outdoor temperature sensing package 86 , the defrost temperature sensing package 87 and the exhaust pressure sensor 88 .

[0044] Reference Figures 1 to 4 The utility model discloses an air conditioning system that can defrost and heat an outdoor unit at the same time, comprising the following steps during operation:

[0045] When heating, first open the first electronic expansion valve 81, close the second electronic expansion valve 84, the first solenoid valve 82 and the second solenoid valve 83. Then, the defrost temperature T1 is detected in real time by the defrost temperature sensing package 87, and the outdoor ambient temperature T2 is detected in real time by the outdoor temperature sensing package 86. When T1<A*T2-B, open the second electronic expansion valve 84 and the second solenoid valve 83. When it is detected that T1>A*T2-B+2, close the second electronic expansion valve 84 and the second solenoid valve 83.

[0046] During cooling, the first electronic expansion valve 81 is first opened, and the second electronic expansion valve 84, the first solenoid valve 82, and the second solenoid valve 83 are closed. The exhaust pressure P1 is detected in real time by the exhaust pressure sensor 88. When P1>C, the second electronic expansion valve 84 and the first solenoid valve 82 are opened. When it is detected that P1<C-2, the second electronic expansion valve 84 and the first solenoid valve 82 are closed.

[0047] Where A is the set ratio, B is the set temperature parameter, and C is the set adjustment parameter.

[0048] It should be noted that the ratio parameter A, the temperature parameter B and the adjustment parameter C can all be set by those skilled in the art according to requirements.

[0049] It is understandable that in heating mode, when A*T2-B is the temperature at which the outdoor heat exchanger needs to be defrosted set by pump technicians, when T1 is less than this value, the heating defrost pipeline 72 needs to be opened for defrosting. In cooling mode, C is the threshold of the exhaust pressure. When the exhaust pressure is higher than C, the cooling pressure-reducing pipeline 73 is opened to reduce the exhaust pressure of the compressor 10.

[0050] As a further improvement of the above scheme, the opening of the second electronic expansion valve 84 is adjusted every 10 seconds to 50 seconds. The opening of the second electronic expansion valve 84 is set to X1. The opening of the second electronic expansion valve in the previous cycle is set to X2. In the heating mode, the opening of the second electronic expansion valve 84 is X1 = X2 + [A*T2-B-T1], and in the cooling mode, the opening of the second electronic expansion valve 84 is X1 = X2 + [P1-C].

[0051] It is worth noting that periodically adjusting the opening of the second electronic expansion valve 84 can achieve precise control of air conditioning cooling or heating and avoid energy waste.

[0052] As a further improvement of the above scheme, it is worth noting that in some embodiments of the present utility model, the value range of the proportional parameter A is 0.5≤A≤0.8; the value range of the temperature parameter B is 4℃≤B≤8℃; the value range of the adjustment parameter C is 35.89Kg≤C≤38.35Kg.

[0053] 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. An air conditioning system capable of heating while defrosting an outdoor unit, characterized in that: include: A compressor (10), a four-way valve (20), an indoor heat exchanger (30), an outdoor heat exchanger (50), a gas-liquid separator (60), and a defrost and pressure-reducing pipeline (70); one end of the defrost and pressure-reducing pipeline (70) is connected to the output end of the compressor (10), and the other end is respectively connected to the input end of the outdoor heat exchanger (50) and / or the input end of the gas-liquid separator (60); during heating, the defrost and pressure-reducing pipeline (70) is used to defrost the outdoor heat exchanger (50); a defrost heat exchanger (71) is provided in the defrost and pressure-reducing pipeline (70); the defrost heat exchanger (71) is arranged on the rear side of the outdoor heat exchanger (50) in the direction of wind flow; the fan of the outdoor heat exchanger (50) causes the air flow to bring the heat of the defrost heat exchanger (71) to the heat exchange components of the outdoor heat exchanger (50) for defrosting; The invention also includes a pipeline control system (80), wherein the pipeline control system includes a first electronic expansion valve (81), wherein the first electronic expansion valve (81) is arranged between the indoor heat exchanger (30) and the outdoor heat exchanger (50) and is close to the indoor heat exchanger (30).

2. An air conditioning system capable of defrosting and heating an outdoor unit according to claim 1, characterized in that: The defrost and pressure-reducing pipeline (70) includes a heating defrost pipeline (72) and a cooling pressure-reducing pipeline (73). When the air conditioner is heating, the heating defrost pipeline (72) can transport part of the high-temperature refrigerant output by the compressor (10) to the defrost heat exchanger (71) to heat the inlet air of the outdoor heat exchange fan. When the air conditioner is cooling, the cooling pressure-reducing pipeline (73) can transport part of the high-temperature and high-pressure refrigerant discharged by the compressor (10) to the defrost heat exchanger (71) for condensation and cooling, thereby reducing the exhaust pressure.

3. An air conditioning system capable of defrosting and heating an outdoor unit according to claim 2, characterized in that: One end of the heating and defrosting pipeline (72) is connected between the output end of the compressor (10) and the input end of the four-way valve (20), and the other end is connected between the gas-liquid separator (60) and the four-way valve (20) and is close to the input end of the gas-liquid separator (60). The defrosting heat exchanger (71) is arranged on the heating and defrosting pipeline (72).

4. The air conditioning system capable of defrosting and heating an outdoor unit according to claim 2, characterized in that: One end of the refrigeration pressure-reducing pipeline (73) is connected between the output end of the compressor (10) and the input end of the four-way valve (20), and the other end is connected between the outdoor heat exchanger (50) and the first electronic expansion valve (81). The defrost heat exchanger (71) is arranged on the refrigeration pressure-reducing pipeline (73).

5. The air conditioning system capable of defrosting and heating an outdoor unit according to claim 1, characterized in that: The pipeline control system (80) also includes a first solenoid valve (82) and a second solenoid valve (83), wherein the first solenoid valve (82) is arranged between the defrost heat exchanger (71) and the first electronic expansion valve (81), and the second solenoid valve (83) is arranged between the output end of the defrost heat exchanger (71) and the input end of the gas-liquid separator (60).

6. An air conditioning system capable of defrosting and heating an outdoor unit according to claim 5, characterized in that: The pipeline control system (80) also includes a second electronic expansion valve (84), an indoor temperature sensing package (85), an outdoor temperature sensing package (86), a defrost temperature sensing package (87) and an exhaust pressure sensor (88), wherein the second electronic expansion valve (84) is arranged between the output end of the compressor (10) and the input end of the defrost heat exchanger (71), the indoor temperature sensing package (85) is arranged on the indoor heat exchanger (30), the outdoor temperature sensing package (86) is arranged on the outdoor heat exchanger (50), the defrost temperature sensing package (87) is arranged on the heat exchange component of the outdoor heat exchanger (50), and the exhaust pressure sensor (88) is arranged at the output end of the compressor (10).

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