Refrigerant flow path of air conditioning system, air conditioning system and control method of air conditioning system

Abstract

The invention relates to an air conditioning system, in particular to a refrigerant flow path of the air conditioning system, the air conditioning system and a control method of the air conditioning system. Based on the refrigerant flow path provided by the invention, air can be heated by using the third heat exchanger before the first fan sends out the air dehumidified by the first heat exchanger in a dehumidification mode of the air conditioning system, so that the problem of air temperature reduction caused by dehumidification of the first heat exchanger is solved. Compared with a refrigerant flow path of a traditional air conditioner, the refrigerant flow path provided by the invention has the advantages that the problem that the indoor temperature is reduced in a dehumidification mode of an air conditioning system is solved, the structure of the refrigerant flow path is not too complicated, and the cost of the refrigerant flow path is not too much increased.

Description

Technical Field

[0001] The present invention relates to an air conditioning system, and in particular to a refrigerant flow path of the air conditioning system, the air conditioning system and a control method thereof. Background Art

[0002] See also Figure 1 The specific process of air conditioning refrigeration is as follows: the compressor 1 compresses the gaseous refrigerant into a high-temperature and high-pressure gas, and sends it to the second heat exchanger 3 through the four-way reversing valve 2 for cooling and liquefaction. The second fan 4 discharges the heat generated by the second heat exchanger 3. The liquid refrigerant is throttled by the first throttling device 7 and sent to the first heat exchanger 5. In the first heat exchanger 5, the liquid refrigerant vaporizes and absorbs heat, cooling the air around the first heat exchanger 5. The cooled air is sent out by the first fan 6, and then the gaseous refrigerant returns to the compressor to start the next cycle. In addition to the above-mentioned devices, the air conditioning system also includes a filter 8, a muffler 9, a pressure switch 10 and other devices.

[0003] The flow direction of the refrigerant in the air conditioner dehumidification process is the same as that in the cooling mode, but compared with the cooling mode, the air conditioner in the dehumidification mode has a lower wind speed of the first fan 6, and the water in the air is more likely to accumulate at the first heat exchanger 5 and then be discharged through the drain pipe. In order to achieve a better dehumidification effect, the traditional air conditioner will maintain the first heat exchanger 5 at a lower temperature in the dehumidification mode. In addition to reducing the indoor air humidity, the dehumidification process will also reduce the indoor temperature. If the dehumidification time is slightly longer, the user will feel it clearly. Summary of the invention

[0004] The technical problem to be solved by the present invention is: how to make the air conditioner dehumidify without affecting the indoor temperature.

[0005] In order to solve the above technical problems, the present invention provides a refrigerant flow path of an air-conditioning system, the refrigerant flow path includes a compressor, a four-way reversing valve, a one-way valve, three heat exchangers, two fans and two throttling devices, the four-way reversing valve has four interfaces, namely a first interface, a second interface, a third interface and a fourth interface, the compressor has two interfaces, namely a fifth interface connected to the first interface and a sixth interface connected to the second interface, the three heat exchangers are respectively a first heat exchanger, a second heat exchanger and a third heat exchanger, each of the heat exchangers has a first end and a second end, the two fans are respectively a first fan arranged at the third heat exchanger and a sixth fan arranged at the second heat exchanger. The second fan of the air-conditioning system is provided, and the third heat exchanger is located between the first fan and the first heat exchanger, and is used to heat the air dehumidified by the first heat exchanger in the dehumidification mode of the air-conditioning system. The two throttling devices are the first throttling device and the second throttling device respectively; the third interface is connected to the first end of the third heat exchanger and the first end of the second heat exchanger respectively, the fourth interface is connected to the first end of the first heat exchanger, the second end of the third heat exchanger is connected to the second end of the first heat exchanger through the second throttling device and the one-way valve connected in series, and the flow direction of the one-way valve is from the third heat exchanger to the first heat exchanger; the second end of the first heat exchanger is connected to the second end of the second heat exchanger through the first throttling device.

[0006] The present invention further provides an air conditioning system, which includes a control device and a refrigerant flow path provided by the present invention, wherein the control device is used to control the flow direction of the refrigerant in the refrigerant flow path.

[0007] The present invention further provides a control method for an air conditioning system, the air conditioning system is the air conditioning system provided by the present invention, the control method is executed by a control device of the air conditioning system, and the control method includes: In the dehumidification mode, the air volume of the first fan is made less than a preset air volume, and the first interface and the third interface, as well as the second interface and the fourth interface are connected in the four-way reversing valve; The refrigerant is compressed into high-temperature and high-pressure gas in the compressor, and flows into the second heat exchanger and the third heat exchanger respectively through the four-way reversing valve; the refrigerant is cooled down in the third heat exchanger and becomes liquid, and flows into the first heat exchanger through the second throttling device and the one-way valve; the refrigerant is cooled down in the second heat exchanger and becomes liquid, and flows into the first heat exchanger through the first throttling device; the refrigerant vaporizes and absorbs heat in the first heat exchanger, becomes gas and flows back to the compressor through the four-way reversing valve to start the next cycle.

[0008] Based on the refrigerant flow path provided by the present invention, the switching of the air conditioning system between the cooling, heating and dehumidification modes can be realized. In the dehumidification mode of the air conditioning system, before the first fan sends out the air dehumidified by the first heat exchanger, the third heat exchanger is used to heat the air, so as to solve the problem of the air temperature drop caused by the dehumidification of the first heat exchanger. Compared with the refrigerant flow path of the traditional air conditioner, the refrigerant flow path provided by the present invention improves the problem of the indoor temperature drop caused by the dehumidification mode of the air conditioning system without overly complicating the structure and control logic of the refrigerant flow path, nor causing an excessive increase in the cost of the refrigerant flow path. BRIEF DESCRIPTION OF THE DRAWINGS

[0009] Figure 1 It is a schematic diagram of the refrigerant flow path of a traditional air-conditioning system; Figure 2 A schematic diagram of the refrigerant flow direction in a dehumidification mode according to an embodiment of the present invention; Figure 3 A schematic diagram of the refrigerant flow direction in a cooling mode according to an embodiment of the present invention; Figure 4 A schematic diagram of the refrigerant flow direction in a heating mode according to an embodiment of the present invention; Reference numerals: Compressor 1, four-way reversing valve 2, second heat exchanger 3, second fan 4, first heat exchanger 5, first fan 6, first throttling device 7, filter 8, muffler 9, pressure switch 10, third heat exchanger 11, second throttling device 12, one-way valve 13. DETAILED DESCRIPTION

[0010] The present invention will be further described below in conjunction with the accompanying drawings and one of the embodiments of the present invention.

[0011] See also Figure 2A refrigerant flow path of an air conditioning system, the refrigerant flow path comprising a compressor 1, a four-way reversing valve 2, a one-way valve 13, three heat exchangers, two fans and two throttling devices, the four-way reversing valve 2 having four interfaces, namely a first interface 21, a second interface 22, a third interface 23 and a fourth interface 24, the compressor 1 having two interfaces, namely a fifth interface 101 connected to the first interface 21 and a sixth interface 102 connected to the second interface 22, the three heat exchangers comprising a first heat exchanger 5, a second heat exchanger 3 and a third heat exchanger 11, each heat exchanger having a first end and a second end, the two fans comprising a first fan 6 arranged at the third heat exchanger 11 and a second fan 4 arranged at the second heat exchanger 3, The third heat exchanger 11 is located between the first fan 6 and the first heat exchanger 5, and is used to heat the air dehumidified by the first heat exchanger 5 in the dehumidification mode of the air-conditioning system. The two throttling devices are the first throttling device 7 and the second throttling device 12 respectively; the third interface 23 is connected to the first end of the third heat exchanger 11 and the first end of the second heat exchanger 3 respectively, and the fourth interface 24 is connected to the first end of the first heat exchanger 5. The second end of the third heat exchanger 11 is connected to the second end of the first heat exchanger 5 through the second throttling device 12 and the one-way valve 13 connected in series, and the flow direction of the one-way valve 13 is from the third heat exchanger 11 to the first heat exchanger 5; the second end of the first heat exchanger 5 is connected to the second end of the second heat exchanger 3 through the first throttling device 7.

[0012] Since the main function of the third heat exchanger 11 is to heat the air dehumidified by the first heat exchanger 5, there is no need to use a heat exchanger with the same specifications as the first heat exchanger 5 or the second heat exchanger 3. Therefore, for cost and volume considerations, the better choice is that the specifications of the third heat exchanger 11 are significantly smaller than the first heat exchanger 5.

[0013] The refrigerant flow path also includes two pressure switches 10, a muffler 9 and four filters 8. The two pressure switches 10 are respectively arranged at the fifth interface 101 and the sixth interface 102, and the muffler 9 is arranged between the fifth interface 101 and the first interface 21; among the four filters 8, two filters 8 are arranged corresponding to the first throttling device 7, and the other two filters 8 are arranged corresponding to the second throttling device 12.

[0014] contrast Figure 2 and Figure 1 Compared with the refrigerant flow path of the traditional air conditioner, this embodiment only adds a branch connected in parallel with the first heat exchanger 5. The main devices on this branch are only the third heat exchange valve 11, the second throttling device 12 and the one-way valve 13. It can be seen that this embodiment improves the problem of indoor temperature drop in the dehumidification mode of the air-conditioning system without overly complicating the structure of the refrigerant flow path or causing excessive increase in the cost of the refrigerant flow path.

[0015] Figure 2Schematic diagram of the refrigerant flow in the dehumidification mode of this embodiment. Figure 2 In the dehumidification mode, the control device of the air conditioning system controls the first fan 6 so that the air volume of the first fan 6 is less than a preset air volume and the air is discharged slowly, so as to facilitate the accumulation of water in the air on the first heat exchanger 5. The control device of the air conditioning system also controls the four-way reversing valve 2 so that the first interface 21 and the third interface 23, and the second interface 22 and the fourth interface 24 are connected in the four-way reversing valve 2.

[0016] Refrigerant flow direction Figure 2 As indicated by the arrow in , the refrigerant is compressed into high-temperature and high-pressure gas in the compressor 1, flows out of the compressor 1 from the fifth interface 101, flows to the four-way reversing valve 2 through the muffler 9, flows into the four-way reversing valve 2 from the first interface 21, passes through the four-way reversing valve 2, flows out of the four-way reversing valve 2 from the third interface 23, and then is split into two paths, flowing into the second heat exchanger 3 and the third heat exchanger 11 respectively.

[0017] In one path, the refrigerant is cooled and liquefied in the third heat exchanger 11 to become a high-temperature and high-pressure liquid, and flows into the first heat exchanger 5 through the second throttling device 12 and the one-way valve 13. The second throttling device 12 changes the high-temperature and high-pressure liquid into a low-temperature and low-pressure liquid. In the other path, the refrigerant is cooled and liquefied in the second heat exchanger 3 to become a high-temperature and high-pressure liquid, and flows into the first heat exchanger 5 through the first throttling device 7. The first throttling device 7 changes the high-temperature and high-pressure liquid into a low-temperature and low-pressure liquid.

[0018] The two refrigerant paths merge and enter the first heat exchanger 5, where they vaporize and absorb heat to become low-temperature and low-pressure gas. After flowing out of the first heat exchanger 5, the refrigerant flows into the four-way reversing valve 2 from the fourth interface 24, passes through the four-way reversing valve 2, flows out of the four-way reversing valve 2 from the second interface 22, and flows back to the compressor 1 from the sixth interface 102 to start the next cycle.

[0019] The air conditioning system includes an indoor unit and an outdoor unit. The indoor unit includes a first fan 6, a first heat exchanger 5 and a third heat exchanger 11, and the outdoor unit includes a second heat exchanger 3 and a second fan 4. Under the action of the first fan 6, the air flows through the low-temperature first heat exchanger 5, the high-temperature third heat exchanger 11 and the first fan 6 in sequence. Since the air volume of the first fan 6 is small, when the air flows slowly through the first heat exchanger 5, the first heat exchanger 5 dehumidifies the air and causes the air to cool down. After that, the third heat exchanger 11 heats the air, and the heated air is sent out from the first fan 6.

[0020] Figure 3 Schematic diagram of the refrigerant flow in the cooling mode of this embodiment. Figure 3In the cooling mode, the control device of the air conditioning system controls the opening of the second throttling device 12 to close the second throttling device 12 to prevent the refrigerant from flowing through the third heat exchanger 11 and affecting the cooling efficiency. The control device of the air conditioning system also controls the four-way reversing valve 2 to connect the first interface 21 and the third interface 23, and the second interface 22 and the fourth interface 24 in the four-way reversing valve 2. In other embodiments of the present invention, the opening of the second throttling device 12 can also be a non-zero value less than a preset opening, and a small amount of refrigerant flowing through the third heat exchanger 11 will not have a significant impact on the cooling efficiency.

[0021] Refrigerant flow direction Figure 3 As indicated by the arrow in , the refrigerant is compressed into high-temperature and high-pressure gas in the compressor 1, flows out of the compressor 1 from the fifth interface 101, flows to the four-way reversing valve 2 through the muffler 9, flows into the four-way reversing valve 2 from the first interface 21, passes through the four-way reversing valve 2, flows out of the four-way reversing valve 2 from the third interface 23, and then flows into the second heat exchanger 3; the refrigerant is cooled and liquefied in the second heat exchanger 3 to become a high-temperature and high-pressure liquid, flows into the first heat exchanger 5 through the first throttling device 7, and the first throttling device 7 converts the high-temperature and high-pressure liquid into a low-temperature and low-pressure liquid; the refrigerant vaporizes and absorbs heat in the first heat exchanger 5 to become a low-temperature and low-pressure gas; after flowing out of the first heat exchanger 5, the refrigerant flows into the four-way reversing valve 2 from the fourth interface 24, passes through the four-way reversing valve 2, flows out of the four-way reversing valve 2 from the second interface 22, and flows back to the compressor 1 from the sixth interface 102 to start the next cycle.

[0022] Under the action of the first fan 6, the air flows through the low-temperature first heat exchanger 5, the third heat exchanger 11 and the first fan 6 in sequence, and the first heat exchanger 5 reduces the air temperature. Compared with the dehumidification mode, the air volume of the first fan 6 in the cooling mode is larger, and the air flows through the indoor unit faster. At the same time, less refrigerant flows through the third heat exchanger 11, which increases the indoor unit's cooling effect on the air and reduces the dehumidification effect.

[0023] Figure 4 Schematic diagram of the refrigerant flow in the heating mode of this embodiment. Figure 4 In the heating mode, the control device of the air conditioning system controls the four-way reversing valve 2 so that the first interface 21 and the fourth interface 24 , and the second interface 22 and the third interface 23 are connected in the four-way reversing valve 2 .

[0024] Refrigerant flow direction Figure 4As indicated by the arrow in , the refrigerant is compressed into high-temperature and high-pressure gas in the compressor 1, flows out of the compressor 1 from the fifth interface 101, flows to the four-way reversing valve 2 through the muffler 9, flows into the four-way reversing valve 2 from the first interface 21, flows into the four-way reversing valve 2 through the four-way reversing valve 2, flows out of the four-way reversing valve 2 from the fourth interface 24, and then flows into the first heat exchanger 5; the refrigerant is cooled and liquefied in the first heat exchanger 5 to become a high-temperature and high-pressure liquid, and flows into the second heat exchanger 3 through the first throttling device 7. The first throttling device 7 turns the high-temperature and high-pressure liquid into a low-temperature and low-pressure liquid. Due to the obstruction of the one-way valve 13, the refrigerant will not flow from the first heat exchanger 5 into the third heat exchanger 11; the refrigerant vaporizes and absorbs heat in the second heat exchanger 3 to become a low-temperature and low-pressure gas; after flowing out of the second heat exchanger 3, the refrigerant flows into the four-way reversing valve 2 from the third interface 23, flows into the four-way reversing valve 2 through the four-way reversing valve 2, flows out of the four-way reversing valve 2 from the second interface 22, and flows back to the compressor 1 from the sixth interface 102 to start the next cycle.

[0025] Under the action of the first fan 6, the air flows through the high-temperature first heat exchanger 5, the third heat exchanger 11 and the first fan 6 in sequence, and the first heat exchanger 5 increases the temperature of the air.

Claims

1. A refrigerant flow path of an air conditioning system, comprising a compressor and a four-way reversing valve, wherein the four-way reversing valve has four interfaces, namely a first interface, a second interface, a third interface and a fourth interface, and the compressor has two interfaces, namely a fifth interface connected to the first interface and a sixth interface connected to the second interface, characterized in that: The refrigerant flow path also includes a one-way valve, three heat exchangers, two fans and two throttling devices. The three heat exchangers are respectively a first heat exchanger, a second heat exchanger and a third heat exchanger. Each heat exchanger has a first end and a second end. The two fans are respectively a first fan arranged at the third heat exchanger and a second fan arranged at the second heat exchanger. The third heat exchanger is located between the first fan and the first heat exchanger and is used to heat the air dehumidified by the first heat exchanger in the dehumidification mode of the air conditioning system. The two throttling devices are respectively a first throttling device and a second throttling device. The third interface is connected to the first end of the third heat exchanger and the first end of the second heat exchanger respectively, the fourth interface is connected to the first end of the first heat exchanger, the second end of the third heat exchanger is connected to the second end of the first heat exchanger through a second throttling device and a one-way valve connected in series, and the flow direction of the one-way valve is from the third heat exchanger to the first heat exchanger; the second end of the first heat exchanger is connected to the second end of the second heat exchanger through the first throttling device.

2. The refrigerant flow path according to claim 1, characterized in that: The third heat exchanger has a smaller specification than the first heat exchanger.

3. The refrigerant flow path according to claim 1 or 2, characterized in that: The refrigerant flow path also includes two pressure switches, a muffler and four filters. The two pressure switches are respectively arranged at the fifth interface and the sixth interface, and the muffler is arranged between the fifth interface and the first interface. Among the four filters, two filters are arranged corresponding to the first throttling device, and the other two filters are arranged corresponding to the second throttling device.

4. An air conditioning system, comprising a control device, characterized in that: It also includes a refrigerant flow path according to any one of claims 1 to 3, and a control device is used to control the flow direction of the refrigerant in the refrigerant flow path.

5. A control method for an air conditioning system, characterized in that: The air conditioning system is the air conditioning system as claimed in claim 4, the control method is executed by a control device of the air conditioning system, and the control method comprises: In the dehumidification mode, the air volume of the first fan is made less than a preset air volume, and the first interface and the third interface, as well as the second interface and the fourth interface are connected in the four-way reversing valve; The refrigerant is compressed into high-temperature and high-pressure gas in the compressor, and flows into the second heat exchanger and the third heat exchanger respectively through the four-way reversing valve; the refrigerant is cooled down in the third heat exchanger and becomes liquid, and flows into the first heat exchanger through the second throttling device and the one-way valve; the refrigerant is cooled down in the second heat exchanger and becomes liquid, and flows into the first heat exchanger through the first throttling device; the refrigerant vaporizes and absorbs heat in the first heat exchanger, becomes gas and flows back to the compressor through the four-way reversing valve to start the next cycle.

6. The control method according to claim 5, characterized in that: Also includes: In the cooling mode, the opening of the second throttling device is made smaller than a preset opening, and the first interface and the third interface, as well as the second interface and the fourth interface are connected in the four-way reversing valve; The refrigerant is compressed into high-temperature and high-pressure gas in the compressor and flows into the second heat exchanger through the four-way reversing valve; the refrigerant is cooled in the second heat exchanger and becomes liquid and flows into the first heat exchanger through the first throttling device; the refrigerant vaporizes and absorbs heat in the first heat exchanger and becomes gas and flows back to the compressor through the four-way reversing valve to start the next cycle.

7. The control method according to claim 6, characterized in that: In cooling mode, the second throttling device is closed.

8. The control method according to claim 5 or 6, characterized in that: Also includes: In the heating mode, the first interface and the fourth interface, as well as the second interface and the third interface are connected in the four-way reversing valve; The refrigerant is compressed into high-temperature and high-pressure gas in the compressor and flows into the first heat exchanger through the four-way reversing valve; the refrigerant is cooled in the first heat exchanger and becomes liquid, and flows into the second heat exchanger through the first throttling device; the refrigerant vaporizes and absorbs heat in the second heat exchanger, becomes gas and flows back to the compressor through the four-way reversing valve to start the next cycle.

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