Direct expansion type air treatment system

Abstract

The utility model relates to the technical field of air conditioners, in particular to a direct expansion type air treatment system which comprises a compressor, an oil-gas separator, a four-way valve, an outdoor condenser and an indoor evaporator, a third pipeline is further communicated with a bypass pipe, the bypass pipe is communicated with a first connector of a reheating coil pipe, a second connector of the reheating coil pipe is connected with a fifth pipeline, and the fifth pipeline is connected with a third pipeline. And the fifth pipeline is communicated with a liquid pipe between the first throttling mechanism and the indoor evaporator. The third pipeline is directly connected with the bypass pipe, a part of high-temperature and high-pressure gaseous refrigerant discharged by the compressor can enter the reheating coil pipe through the bypass pipe, and after air exchanges heat with an indoor evaporator for cooling and dehumidification, the air can exchange heat with the reheating coil pipe, so that the temperature is increased, and finally the aim of dehumidification without cooling is achieved. And the comfort is improved.

Description

Technical Field

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

[0002] The characteristic of direct expansion air conditioning units is that the unit itself has a compressor. The liquid refrigerant in its refrigeration system directly evaporates and expands in its evaporator coil to absorb heat from the air outside the coil and cool it.

[0003] For example, the Chinese invention patent with publication number CN109282520B discloses a vortex tube and compression composite direct expansion air conditioning system and control method, such as Figure 1 As shown, the system includes a compressor, a condenser, a subcooling tank, a first throttle valve, an evaporator, and a vortex tube, a first heat exchanger, a second heat exchanger, and a first fan, which are connected in sequence with end-to-end pipelines; the gas inlet of the vortex tube is connected to the outlet of the compressor, the cold side outlet of the vortex tube is connected to the first heat exchanger, the hot side outlet of the vortex tube is connected to the second heat exchanger, and the outlet of the first heat exchanger and the outlet of the second heat exchanger are both connected to the subcooling tank; the condenser and the second heat exchanger are used for heat exchange with outdoor air, the first heat exchanger and the evaporator are used for heat exchange with fresh air, and the first fan is arranged on one side of the first heat exchanger to drive the fresh air to flow from the first heat exchanger to the evaporator.

[0004] Another example is a Chinese invention patent with publication number CN108317650B which discloses a multi-connected air conditioning heat pump system with independent fresh air. Figure 2 As shown, it includes an air-conditioning outdoor unit, an air-conditioning indoor unit and a fresh air unit, wherein an air filter device, a second air heat exchanger, a centrifugal fan, a third air heat exchanger and a humidifier are installed inside the fresh air unit; a compressor, a four-way reversing valve and a first air heat exchanger are installed inside the air-conditioning outdoor unit, the compressor is connected to the four-way reversing valve, the four-way reversing valve and the first air heat exchanger, the second air heat exchanger, the third air heat exchanger and the air-conditioning indoor unit are interconnected, wherein the first air heat exchanger and the third air heat exchanger are connected in parallel, and the second air heat exchanger and the air-conditioning indoor unit are connected in parallel.

[0005] The direct expansion air conditioning system in the prior art often only has the cooling and dehumidification functions during the transition season, that is, under low temperature and high humidity environmental conditions, that is, dehumidification and cooling are carried out simultaneously. Although the air outlet humidity is low at this time, the temperature is also low, and good comfort is not achieved at this time. Utility Model Content

[0006] In order to solve the above problems, the purpose of the utility model is to provide a direct expansion air treatment system.

[0007] The technical solution provided by the utility model is:

[0008] A direct expansion air treatment system, comprising:

[0009] A compressor, wherein the outlet of the compressor is connected to a first pipeline, and the inlet of the compressor is connected to a second pipeline;

[0010] An oil-gas separator, wherein the first pipeline is connected to an inlet of the oil-gas separator, an oil outlet of the oil-gas separator is connected to a second pipeline through an oil circuit, and a gas outlet of the oil-gas separator is connected to a third pipeline;

[0011] A four-way valve, wherein the four interfaces of the four-way valve are respectively connected to the second pipeline, the third pipeline, the air pipe, and the fourth pipeline;

[0012] The fourth pipeline is connected to the first interface of the outdoor condenser.

[0013] The second interface of the outdoor condenser is connected to the liquid pipe, the liquid pipe is communicated with the first interface of the indoor evaporator, and the second interface of the indoor evaporator is communicated with the gas pipe;

[0014] A first throttling mechanism is installed on the liquid pipe, and the first throttling mechanism is used to reduce the temperature and pressure of the refrigerant in the liquid pipe;

[0015] The third pipeline is also connected to the bypass pipe, the bypass pipe is connected to the first interface of the reheat coil, the second interface of the reheat coil is connected to the fifth pipeline, and the fifth pipeline is connected to the liquid pipe between the first throttling mechanism and the indoor evaporator;

[0016] A second throttling mechanism is installed on the fifth pipeline, and the second throttling mechanism is used to reduce the pressure of the refrigerant in the fifth pipeline;

[0017] The outdoor condenser is used for exchanging heat with the refrigerant introduced into the fourth pipeline;

[0018] The indoor evaporator is used for exchanging heat with the air flowing therethrough.

[0019] As an optional technical solution, it also includes an indoor fan and a filtering mechanism, wherein the indoor fan is used to synchronously draw in outdoor fresh air and indoor dirty air, and the filtering mechanism is used to filter the mixed outdoor fresh air and indoor dirty air.

[0020] Optionally, it also includes a fresh air valve and a return air valve; wherein the outdoor fresh air is drawn into the indoor fan via the fresh air valve, and the indoor dirty air is drawn into the indoor fan via the return air valve.

[0021] Furthermore, it also includes a detection mechanism, which is used to detect indoor air parameters;

[0022] According to indoor air parameters, the fresh air valve can adjust the amount of outdoor fresh air drawn in, and the return air valve can adjust the amount of indoor dirty air drawn in.

[0023] As an optional technical solution, it also includes a sixth pipeline, one end of which is connected to the first pipeline, and the other end of which is connected to the second pipeline.

[0024] Optionally, a solenoid valve and a filter are installed on the sixth pipeline.

[0025] As an optional technical solution, it also includes an outdoor fan, which is used to extract air for heat exchange with an outdoor condenser.

[0026] As an optional technical solution, the first throttling mechanism and the second throttling mechanism are both electronic expansion valves.

[0027] As an optional technical solution, a humidifying mechanism is also included, and the humidifying mechanism is used to humidify the air heated by the indoor evaporator.

[0028] As an optional technical solution, the air pipe, bypass pipe and liquid pipe are all installed with stop valves; the air pipe, bypass pipe and liquid pipe are all arranged in sections, wherein each section of the air pipe is connected by an air pipe joint, each section of the bypass pipe is connected by a bypass joint, and each section of the liquid pipe is connected by a liquid pipe joint.

[0029] Compared with the prior art, the technical solution provided by the utility model has the following beneficial effects:

[0030] The third pipeline of the utility model is directly connected to the bypass pipe, and a part of the high-temperature and high-pressure gaseous refrigerant discharged from the compressor can enter the reheat coil through the bypass pipe. After the air is cooled and dehumidified by heat exchange with the indoor evaporator, it can exchange heat with the reheat coil again, thereby increasing the temperature, ultimately achieving the purpose of dehumidification without cooling and improving comfort.

[0031] In addition, the utility model connects the first pipeline and the second pipeline through the sixth pipeline. When the solenoid valve is opened, the refrigerant circulation volume of the compressor can be increased, and the outdoor condenser can be quickly defrosted after the exhaust temperature is increased.

[0032] The utility model can control the amount of outdoor fresh air sucked in through the fresh air valve, and can prevent repeated circulation of harmful gases in the room through the return air valve. BRIEF DESCRIPTION OF THE DRAWINGS

[0033] Figure 1 It is a schematic diagram of an air conditioning system in the prior art;

[0034] Figure 2 It is another schematic diagram of an air conditioning system in the prior art;

[0035] Figure 3 This is a schematic diagram of a system in an embodiment of the present application.

[0036] Explanation of the symbols in the schematic diagram:

[0037] Compressor 101, oil-gas separator 102, oil-liquid circuit 103, third pipeline 104, bypass pipe 105, air pipe 106, four-way valve 107, second pipeline 108, fourth pipeline 109, first pipeline 110, sixth pipeline 111, outdoor condenser 112, outdoor fan 113, liquid pipe 114, first throttling mechanism 115;

[0038] Liquid pipe joint 201, humidification mechanism 202, reheat coil 203, fifth pipeline 204, indoor evaporator 205, bypass joint 206, gas pipe joint 207, indoor fan 208, return air valve 209, fresh air valve 210, second throttling mechanism 211. DETAILED DESCRIPTION

[0039] In order to further understand the content of the utility model, the utility model is described in detail in conjunction with the drawings and embodiments.

[0040] The structures, proportions, sizes, etc. illustrated in the drawings of this specification are only used to match the contents disclosed in the specification for people familiar with this technology to understand and read, and are not used to limit the limiting conditions for the implementation of the present invention, so they have no substantial technical significance. Any modification of the structure, change of the proportion relationship or adjustment of the size, without affecting the effects and purposes that can be achieved by the present invention, should still fall within the scope of the technical content disclosed by the present utility model. At the same time, the terms such as "upper", "lower", "left", "right", "middle" and so on quoted in this specification are only for the convenience of description, and are not used to limit the scope of implementation. The change or adjustment of their relative relationship should also be regarded as the scope of implementation of the present invention without substantially changing the technical content.

[0041] like Figure 3 As shown, in one embodiment, the utility model proposes a direct expansion air treatment system, including a compressor 101, the outlet of the compressor 101 is connected to a first pipeline 110, the inlet of the compressor 101 is connected to a second pipeline 108, the low-temperature and low-pressure gaseous refrigerant enters the compressor 101 from the second pipeline 108, the compressor 101 compresses the low-temperature and low-pressure gaseous refrigerant into a high-temperature and high-pressure gaseous refrigerant, and then the high-temperature and high-pressure gaseous refrigerant is discharged from the first pipeline 110.

[0042] The first pipeline 110 is connected to the inlet of the oil-gas separator 102, the oil outlet of the oil-gas separator 102 is connected to the second pipeline 108 through the oil-liquid circuit 103, and the gas outlet of the oil-gas separator 102 is connected to the third pipeline 104. Since the high-temperature and high-pressure gaseous refrigerant discharged from the first pipeline 110 will carry the compressor refrigeration oil, the oil-gas separator 102 will separate the compressor refrigeration oil, and the compressor refrigeration oil will enter the second pipeline 108 through the oil-liquid circuit 103, and the compressor refrigeration oil will follow the low-temperature and low-pressure gaseous refrigerant in the second pipeline 108 and then enter the compressor 101. The high-temperature and high-pressure gaseous refrigerant after the refrigeration oil is separated will enter the third pipeline 104.

[0043] The direct expansion air treatment system in this embodiment further includes a four-way valve 107, and the four interfaces of the four-way valve 107 are respectively connected to the second pipeline 108, the third pipeline 104, the air pipe 106, and the fourth pipeline 109. Among them, the fourth pipeline 109 is connected to the first interface of the outdoor condenser 112, the second interface of the outdoor condenser 112 is connected to the liquid pipe 114, the liquid pipe 114 is connected to the first interface of the indoor evaporator 205, and the second interface of the indoor evaporator 205 is connected to the air pipe 106.

[0044] The third pipeline 104 is also connected to the bypass pipe 105, the bypass pipe 105 is connected to the first interface of the reheat coil 203, the second interface of the reheat coil 203 is connected to the fifth pipeline 204, and the fifth pipeline 204 is connected to the liquid pipe 114 between the first throttling mechanism 115 and the indoor evaporator 205.

[0045] A first throttling mechanism 115 is installed on the liquid pipe 114, and the first throttling mechanism 115 is used to reduce the temperature and pressure of the refrigerant in the liquid pipe 114. A second throttling mechanism 211 is installed on the fifth pipeline 204, and the second throttling mechanism 211 is used to reduce the pressure of the refrigerant in the fifth pipeline 204.

[0046] The outdoor condenser 112 is used for exchanging heat with the refrigerant introduced into the fourth pipeline 109, and the indoor evaporator 205 is used for exchanging heat with the air flowing therethrough.

[0047] When it is necessary to cool and dehumidify the indoor air, the low-temperature and low-pressure gaseous refrigerant enters the compressor 101 from the second pipeline 108, and the compressor 101 compresses the low-temperature and low-pressure gaseous refrigerant into a high-temperature and high-pressure gaseous refrigerant. The high-temperature and high-pressure gaseous refrigerant enters the oil-gas separator 102 through the first pipeline 110, and the compressor refrigeration oil carried in the high-temperature and high-pressure gaseous refrigerant is separated. Then the high-temperature and high-pressure gaseous refrigerant enters the outdoor condenser 112 through the third pipeline 104, the four-way valve 107, and the fourth pipeline 109, and exchanges heat with the outdoor air to form a high-temperature and high-pressure liquid refrigerant. Then the high-temperature and high-pressure liquid refrigerant enters the liquid pipe 114, and the first throttling mechanism 115 throttles the high-temperature and high-pressure liquid refrigerant in the liquid pipe 114 into a low-temperature and low-pressure liquid refrigerant. Then the low-temperature and low-pressure liquid refrigerant enters the indoor evaporator 205 to exchange heat with the indoor air to cool and dehumidify the indoor air. After heat exchange in the indoor evaporator 205 , the low-temperature and low-pressure liquid refrigerant enters the gas pipe 106 , and then enters the second pipeline 108 through the four-way valve 107 .

[0048] When it is necessary to dehumidify the indoor air without cooling, the remaining steps are the same as the above-mentioned cooling and dehumidification, except that: a part of the high-temperature and high-pressure gaseous refrigerant in the third pipeline 104 can enter the reheat coil 203 through the bypass pipe 105. After the indoor air is cooled and dehumidified by heat exchange with the indoor evaporator 205, it is then heat exchanged with the reheat coil 203 to increase the temperature, and finally achieve the purpose of dehumidification without cooling and improve the comfort. The high-temperature and high-pressure gaseous refrigerant after heat exchange in the reheat coil 203 becomes low-temperature and high-pressure liquid refrigerant and enters the fifth pipeline 204. After being throttled into low-temperature and low-pressure liquid refrigerant by the second throttling mechanism 211, this part of the low-temperature and low-pressure liquid refrigerant is mixed with the low-temperature and low-pressure liquid refrigerant throttled into by the first throttling mechanism 115, and enters the indoor evaporator 205 together for heat exchange.

[0049] When the indoor air needs to be heated, such as in winter, the high-temperature and high-pressure gaseous refrigerant in the third pipeline 104 directly enters the air pipe 106 after being switched by the four-way valve 107, and then enters the indoor evaporator 205 to heat the air.

[0050] In an optional solution, the system further includes an indoor fan 208 and a filter mechanism, wherein the indoor fan 208 is used to synchronously draw in outdoor fresh air and indoor dirty air, and the filter mechanism is used to filter the mixed outdoor fresh air and indoor dirty air. The processed air exchanges heat with the indoor evaporator 205.

[0051] The filtering mechanism can achieve air filtering, which is relatively mature in the prior art and will not be elaborated here.

[0052] In order to control the outdoor fresh air volume and indoor dirty air volume, the system also includes a fresh air valve 210, a return air valve 209, and a detection mechanism, wherein the outdoor fresh air is extracted by the indoor fan 208 through the fresh air valve 210, and the indoor dirty air is extracted by the indoor fan 208 through the return air valve 209. The detection mechanism can detect indoor air parameters. 2 , PM2.5 and other air parameters to adjust the amount of outdoor fresh air entering the room. When it is detected that the indoor dirty air contains harmful gases such as VOC, the return air valve 209 can adjust the amount of indoor dirty air extracted, that is, the return air volume, so as to prevent the harmful gas from circulating repeatedly.

[0053] Testing agencies need to be able to detect indoor CO 2 , PM2.5, VOC and other air parameters, which are relatively mature in the existing technology and will not be elaborated here.

[0054] In winter, the outdoor condenser 112 may face the problem of frost. In an optional solution, the system further includes a sixth pipeline 111, one end of which is connected to the first pipeline 110, and the other end is connected to the second pipeline 108. A solenoid valve and a filter are installed on the sixth pipeline 111. When the solenoid valve is opened, the refrigerant circulation amount of the compressor 101 can be increased, and the outdoor condenser 112 can be quickly defrosted after the exhaust temperature is increased.

[0055] The system is also provided with an outdoor fan 113 , which can draw air to exchange heat with the outdoor condenser 112 .

[0056] The first throttling mechanism 115 and the second throttling mechanism 211 are both electronic expansion valves. It should be noted that the first throttling mechanism 115 and the second throttling mechanism 211 are not limited to electronic expansion valves, and other devices that can achieve the above effects are also acceptable, and are not limited here.

[0057] When heating the indoor air in winter, it is sometimes necessary to humidify the air at the same time. The system also includes a humidifying mechanism 202, such as a wet film. The humidifying mechanism 202 can humidify the air heated by the indoor evaporator 205.

[0058] As an optional embodiment, in this system, the gas pipe 106, the bypass pipe 105, and the liquid pipe 114 are all installed with stop valves, and the on and off of the pipelines are controlled by the stop valves. The gas pipe 106, the bypass pipe 105, and the liquid pipe 114 are all arranged in sections, wherein each section of the gas pipe 106 is connected by a gas pipe joint 207, each section of the bypass pipe 105 is connected by a bypass joint 206, and each section of the liquid pipe 114 is connected by a liquid pipe joint 201. By arranging the gas pipe 106, the bypass pipe 105, and the liquid pipe 114 in sections, the system is divided into an indoor interior and an outdoor interior, which is convenient for transportation and installation.

[0059] The above schematically describes the present invention and its implementation methods, which are not restrictive. The drawings show only one implementation method of the present invention, and the actual structure is not limited thereto. Therefore, if ordinary technicians in this field are inspired by it and design structural methods and embodiments similar to the technical solution without creativity without departing from the purpose of the present invention, they should all fall within the protection scope of the present invention.

Claims

1. A direct expansion air treatment system, characterized in that: include: A compressor (101), wherein the outlet of the compressor (101) is connected to a first pipeline (110), and the inlet of the compressor (101) is connected to a second pipeline (108); An oil-gas separator (102), wherein the first pipeline (110) is connected to an inlet of the oil-gas separator (102), an oil outlet of the oil-gas separator (102) is connected to a second pipeline (108) via an oil circuit (103), and a gas outlet of the oil-gas separator (102) is connected to a third pipeline (104); A four-way valve (107), wherein four interfaces of the four-way valve (107) are respectively connected to the second pipeline (108), the third pipeline (104), the air pipe (106), and the fourth pipeline (109); The fourth pipeline (109) is connected to the first interface of the outdoor condenser (112). The second interface of the outdoor condenser (112) is connected to the liquid pipe (114), the liquid pipe (114) is connected to the first interface of the indoor evaporator (205), and the second interface of the indoor evaporator (205) is connected to the gas pipe (106); A first throttling mechanism (115) is installed on the liquid pipe (114), and the first throttling mechanism (115) is used to reduce the temperature and pressure of the refrigerant in the liquid pipe (114); The third pipeline (104) is also in communication with the bypass pipe (105), the bypass pipe (105) is in communication with the first interface of the reheat coil (203), the second interface of the reheat coil (203) is connected with the fifth pipeline (204), and the fifth pipeline (204) is in communication with the liquid pipe (114) between the first throttling mechanism (115) and the indoor evaporator (205); A second throttling mechanism (211) is installed on the fifth pipeline (204), and the second throttling mechanism (211) is used to reduce the pressure of the refrigerant in the fifth pipeline (204); The outdoor condenser (112) is used to exchange heat with the refrigerant introduced into the fourth pipeline (109); The indoor evaporator (205) is used to exchange heat with the air flowing through it.

2. The direct expansion air treatment system according to claim 1, characterized in that: It also includes an indoor fan (208) and a filtering mechanism, wherein the indoor fan (208) is used to synchronously draw in outdoor fresh air and indoor dirty air, and the filtering mechanism is used to filter the mixed outdoor fresh air and indoor dirty air.

3. The direct expansion air treatment system according to claim 2, characterized in that: It also includes a fresh air valve (210) and a return air valve (209); The outdoor fresh air is drawn into the indoor fan (208) via the fresh air valve (210), and the indoor dirty air is drawn into the indoor fan (208) via the return air valve (209).

4. The direct expansion air treatment system according to claim 3, characterized in that: Also included is a detection mechanism, which is used to detect indoor air parameters; According to indoor air parameters, the fresh air valve (210) can adjust the amount of outdoor fresh air extracted, and the return air valve (209) can adjust the amount of indoor dirty air extracted.

5. The direct expansion air treatment system according to claim 1, characterized in that: It also includes a sixth pipeline (111), one end of which is connected to the first pipeline (110), and the other end of which is connected to the second pipeline (108).

6. The direct expansion air treatment system according to claim 5, characterized in that: The sixth pipeline (111) is installed with a solenoid valve and a filter.

7. The direct expansion air treatment system according to any one of claims 1 to 6, characterized in that: It also includes an outdoor fan (113), which is used to extract air and exchange heat with the outdoor condenser (112).

8. The direct expansion air treatment system according to any one of claims 1 to 6, characterized in that: The first throttling mechanism (115) and the second throttling mechanism (211) are both electronic expansion valves.

9. The direct expansion air treatment system according to any one of claims 1 to 6, characterized in that: It also includes a humidifying mechanism (202), which is used to humidify the air heated by the indoor evaporator (205).

10. The direct expansion air treatment system according to any one of claims 1 to 6, characterized in that: The gas pipe (106), the bypass pipe (105) and the liquid pipe (114) are all equipped with stop valves; The air pipe (106), the bypass pipe (105), and the liquid pipe (114) are all arranged in sections, wherein each section of the air pipe (106) is connected via an air pipe joint (207), each section of the bypass pipe (105) is connected via a bypass joint (206), and each section of the liquid pipe (114) is connected via a liquid pipe joint (201).

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