Air conditioning system

Abstract

An air conditioning system includes a compressor, a first heat exchanger and a second heat exchanger, the compressor, the first heat exchanger and the second heat exchanger are connected through a refrigerant pipeline, a four-way valve is installed on the refrigerant pipeline, and a throttling device is installed on the refrigerant pipeline between the first heat exchanger and the second heat exchanger. It is characterized in that it also includes a first refrigerant branch and a second refrigerant branch, the first end of the first refrigerant branch is connected to the refrigerant pipeline between the first heat exchanger and the throttling device, the first end of the second refrigerant branch is connected to the refrigerant pipeline between the second heat exchanger and the throttling device, and the second end of the first refrigerant branch and the second end of the second refrigerant branch are merged and connected to the refrigerant pipeline between the four-way valve and the compressor. The advantages of the present invention are that the air conditioning system solves the problem that the compressor must be shut down when the indoor temperature reaches the set temperature in the cooling mode and the surface of the first heat exchanger is prone to frost in the heating mode.

Description

Technical Field

[0001] The invention relates to an air conditioning system. Background Art

[0002] Existing air conditioning systems generally have outdoor air inlets and indoor air outlets. Outdoor fresh air enters the air conditioner through the outdoor air inlet, and is replenished to the room from the indoor air outlet after heat exchange in the heat exchanger, that is, the air conditioner works in the fresh air mode. A common problem with existing air conditioning systems is that when the indoor temperature reaches the set temperature, the fresh air fan must be shut down, which will cause incomplete evaporation of the refrigerant in the evaporator and the risk of liquid compression in the compressor. If the compressor is not shut down, it may cause component damage and make the system unable to work normally. In addition, in the heating mode, the evaporator is prone to frost, which affects the refrigeration performance. In summary, further improvements need to be made to the existing air conditioning system. Summary of the invention

[0003] The technical problem to be solved by the present invention is to provide an air conditioning system which can avoid the risk of liquid compression and frost on the evaporator in view of the above-mentioned existing technical status.

[0004] The technical solution adopted by the present invention to solve the above-mentioned technical problems is as follows: the air conditioning system includes a compressor, a first heat exchanger and a second heat exchanger, the compressor, the first heat exchanger and the second heat exchanger are connected through a refrigerant pipeline, a four-way valve is installed on the refrigerant pipeline, and a throttling device is installed on the refrigerant pipeline between the first heat exchanger and the second heat exchanger. It is characterized in that: it also includes a first refrigerant branch and a second refrigerant branch, the first end of the first refrigerant branch is connected to the refrigerant pipeline between the first heat exchanger and the throttling device, the first end of the second refrigerant branch is connected to the refrigerant pipeline between the second heat exchanger and the throttling device, and the second end of the first refrigerant branch merges with the second end of the second refrigerant branch and is connected to the refrigerant pipeline between the four-way valve and the compressor.

[0005] In order to enable the system to switch normally between cooling and heating modes, the first port of the four-way valve is connected to the first heat exchanger, the fourth port of the four-way valve is connected to the second heat exchanger, the second port and the third port of the four-way valve are connected to the compressor, and the second end of the first refrigerant branch and the second end of the second refrigerant branch are merged and connected to the refrigerant pipeline between the third port of the four-way valve and the compressor.

[0006] As a preferred solution, a first stop valve is installed on the first refrigerant branch, and a second stop valve is installed on the second refrigerant branch. Thus, by opening the first stop valve or the second stop valve, the refrigerant flows into the corresponding refrigerant branch.

[0007] As another preferred scheme, a three-way reversing valve is installed at the second end of the first refrigerant branch and the second end of the second refrigerant branch, the first end of the three-way reversing valve is connected to the refrigerant pipeline between the third port of the four-way valve and the compressor, the second end of the three-way reversing valve is connected to the second end of the first refrigerant branch, and the third end of the three-way reversing valve is connected to the second end of the second refrigerant branch.

[0008] More preferably, a first capillary tube is installed on the first refrigerant branch, and a second capillary tube is installed on the second refrigerant branch.

[0009] As a preferred embodiment of any of the above schemes, a first fan is provided near the first heat exchanger, and a second fan is provided near the second heat exchanger.

[0010] Compared with the prior art, the advantages of the present invention are: the air conditioning system has a first refrigerant branch and a second refrigerant branch, the first end of the first refrigerant branch is connected to the refrigerant pipeline between the first heat exchanger and the throttling device, the first end of the second refrigerant branch is connected to the refrigerant pipeline between the second heat exchanger and the throttling device, the second end of the first refrigerant branch and the second end of the second refrigerant branch merge and are connected to the refrigerant pipeline between the four-way valve and the compressor, which solves the problem that the compressor must be shut down when the indoor temperature reaches the set temperature in the cooling mode and the surface of the first heat exchanger is prone to frost in the heating mode. BRIEF DESCRIPTION OF THE DRAWINGS

[0011] Figure 1 This is a schematic diagram of refrigerant flow in the cooling mode of the first embodiment of the present invention;

[0012] Figure 2 This is a schematic diagram of the refrigerant flow in the heating mode according to the first embodiment of the present invention;

[0013] Figure 3 Schematic diagram of refrigerant flow in cooling mode according to the second embodiment of the present invention. DETAILED DESCRIPTION

[0014] The present invention is further described in detail below with reference to the accompanying drawings.

[0015] like Figure 1 and Figure 2 As shown, the air conditioning system of this embodiment includes a compressor 11, a first heat exchanger 12 and a second heat exchanger 13. The compressor 11, the first heat exchanger 12 and the second heat exchanger 13 are connected through a refrigerant pipeline 14. A four-way valve 15 and a throttling device 16 are installed on the refrigerant pipeline 14. The air conditioning working mode is switched by switching the four-way valve 15. The cooling and heating principles of the air conditioning system are the same as those of the existing air conditioner, and will not be described in detail here.

[0016] In this embodiment, the first port of the four-way valve 15 is connected to the first heat exchanger 12, the fourth port of the four-way valve 15 is connected to the second heat exchanger 13, and the second port and the third port of the four-way valve 15 are connected to the compressor 11. A first fan 24 is provided near the first heat exchanger 12, and a second fan 25 is provided near the second heat exchanger 13. The throttling device 16 is installed on the refrigerant pipeline 14 between the first heat exchanger 12 and the second heat exchanger 13.

[0017] A first refrigerant branch 17 and a second refrigerant branch 18 are also provided on the refrigerant pipeline 14. The first end of the first refrigerant branch 17 is connected to the refrigerant pipeline 14 between the first heat exchanger 12 and the throttling device 16, the first end of the second refrigerant branch 18 is connected to the refrigerant pipeline 14 between the second heat exchanger 13 and the throttling device 16, and the second end of the first refrigerant branch 17 and the second end of the second refrigerant branch 18 are merged and connected to the refrigerant pipeline 14 between the four-way valve 15 and the compressor 11. A first capillary tube 22 is installed on the first refrigerant branch 17, and a second capillary tube 23 is installed on the second refrigerant branch 18.

[0018] In this embodiment, the second end of the first refrigerant branch 17 and the second end of the second refrigerant branch 18 merge and are connected to the refrigerant pipeline 14 between the third port of the four-way valve 15 and the compressor 11. A first stop valve 19 is installed on the first refrigerant branch 17, and a second stop valve 20 is installed on the second refrigerant branch 18.

[0019] The system also has a fresh air inlet (not shown) connected to the outdoors and a fresh air outlet (shown) connected to the indoors. In particular, when used as a kitchen air conditioner, the fresh air blown out of the fresh air outlet is supplemented into the kitchen.

[0020] In the cooling mode, the first heat exchanger 12 is a condenser, the second heat exchanger 13 is an evaporator, and the refrigerant flow direction is as follows: Figure 1As shown. The high-temperature and high-pressure gas refrigerant from the compressor 11 condenses into a high-temperature and high-pressure liquid in the first heat exchanger 12, and is throttled by the throttling device 16 to become a low-temperature and low-pressure liquid, and then evaporates in the second heat exchanger 13 to become a low-temperature and low-pressure gas, and is finally sucked into the compressor 11 for compression. In summer, the high-temperature fresh air outside is powered by the second fan 25 to flow through the surface of the second heat exchanger 13 and exchange heat with it. The high-temperature fresh air is converted into low-temperature fresh air and sent into the room, and mixed with the indoor air to achieve the purpose of cooling. As the system continues to run, the indoor air temperature reaches the set value. At this time, the second stop valve 20 is opened, and the first stop valve 19 is still in a closed state. A part of the high-temperature and high-pressure refrigerator gas from the compressor 11 is diverted to the second refrigerant branch 18, throttled by the second capillary 23, and mixed with the low-temperature and low-pressure liquid refrigerant in the throttling device 16. The temperature of the mixed refrigerant increases, so that the surface temperature of the second heat exchanger 13 increases, and then the outlet temperature of the fresh air that exchanges heat with it increases, and the fresh air can be continuously replenished to the room. In this way, the problem that when the indoor temperature reaches the set temperature value, the compressor 11 must be shut down, the fresh air fan, i.e., the second fan 25 must be shut down, and the fresh air is intermittently supplied is solved, which is beneficial to extending the service life of the system.

[0021] In the heating mode, the first heat exchanger 12 is an evaporator, and the second heat exchanger 13 is a condenser. The first heat exchanger 12 is prone to frost. The refrigerant flow direction is as follows: Figure 2 At this time, the first stop valve 19 is opened, and the second stop valve 20 is still in a closed state. A portion of the high-temperature and high-pressure gas refrigerant from the compressor 11 is introduced into the first refrigerant branch 17, throttled by the first capillary tube 22, and mixed with the low-temperature and low-pressure liquid refrigerant in the throttling device 16. The temperature of the mixed refrigerant is increased, so that the surface temperature of the first heat exchanger 12 is increased, thereby preventing frost on the surface of the first heat exchanger 12.

[0022] Embodiment 2:

[0023] like Figure 3As shown, the air conditioning system of this embodiment is equipped with a three-way reversing valve 21 at the second end of the first refrigerant branch 17 and the second end of the second refrigerant branch 18. The first end of the three-way reversing valve 21 is connected to the refrigerant pipeline 14 between the third port of the four-way valve 15 and the compressor 11, the second end of the three-way reversing valve 21 is connected to the second end of the first refrigerant branch 17, and the third end of the three-way reversing valve 21 is connected to the second end of the second refrigerant branch 18. That is, the first stop valve and the second stop valve in the first embodiment are replaced by the three-way reversing valve 21. During normal operation, a is in the stop position; in the cooling mode, ac is bypassed; in the heating mode, ab is bypassed. In different cooling and heating modes, the high-temperature and high-pressure gas refrigerant from the compressor 11 is switched through the switching of the three-way reversing valve 21 to select the first refrigerant branch 17 or the second refrigerant branch 18. The specific working principle of this embodiment is the same as that of the first embodiment, and will not be described in detail here.

Claims

1. An air conditioning system, comprising a compressor (11), a first heat exchanger (12) and a second heat exchanger (13), wherein the compressor (11), the first heat exchanger (12) and the second heat exchanger (13) are connected via a refrigerant pipeline (14), a four-way valve (15) is installed on the refrigerant pipeline (14), and a throttling device (16) is installed on the refrigerant pipeline (14) between the first heat exchanger (12) and the second heat exchanger (13), characterized in that: It also includes a first refrigerant branch (17) and a second refrigerant branch (18), wherein the first end of the first refrigerant branch (17) is connected to the refrigerant pipeline (14) between the first heat exchanger (12) and the throttling device (16), and the first end of the second refrigerant branch (18) is connected to the refrigerant pipeline (14) between the second heat exchanger (13) and the throttling device (16). The second end of the first refrigerant branch (17) and the second end of the second refrigerant branch (18) merge and are connected to the refrigerant pipeline (14) between the four-way valve (15) and the compressor (11). The first port of the four-way valve (15) is connected to the first heat exchanger (12), and the fourth port of the four-way valve (15) is connected to the second heat exchanger (13). The second port and the third port of the four-way valve (15) are connected to the compressor (11), the second end of the first refrigerant branch (17) and the second end of the second refrigerant branch (18) are merged and connected to the refrigerant pipeline (14) between the third port of the four-way valve (15) and the compressor (11), a first stop valve (19) is installed on the first refrigerant branch (17), a second stop valve (20) is installed on the second refrigerant branch (18), a first capillary tube (22) is installed on the first refrigerant branch (17), and a second capillary tube (23) is installed on the second refrigerant branch (18), a first fan (24) is provided near the first heat exchanger (12), and a second fan (25) is provided near the second heat exchanger (13).

2. An air conditioning system, comprising a compressor (11), a first heat exchanger (12) and a second heat exchanger (13), wherein the compressor (11), the first heat exchanger (12) and the second heat exchanger (13) are connected via a refrigerant pipeline (14), a four-way valve (15) is installed on the refrigerant pipeline (14), and a throttling device (16) is installed on the refrigerant pipeline (14) between the first heat exchanger (12) and the second heat exchanger (13), characterized in that: It also includes a first refrigerant branch (17) and a second refrigerant branch (18), wherein the first end of the first refrigerant branch (17) is connected to the refrigerant pipeline (14) between the first heat exchanger (12) and the throttling device (16), the first end of the second refrigerant branch (18) is connected to the refrigerant pipeline (14) between the second heat exchanger (13) and the throttling device (16), the second end of the first refrigerant branch (17) and the second end of the second refrigerant branch (18) merge and are connected to the refrigerant pipeline (14) between the four-way valve (15) and the compressor (11), the first port of the four-way valve (15) is connected to the first heat exchanger (12), the fourth port of the four-way valve (15) is connected to the second heat exchanger (13), the second port and the third port of the four-way valve (15) are connected to the compressor (11), the second end of the first refrigerant branch (17) and the second end of the second refrigerant branch (18) merge and are connected to the refrigerant pipeline (14) between the four-way valve (15) and the compressor (11), The first refrigerant branch (17) and the second refrigerant branch (18) are connected to each other on the refrigerant pipeline (14) between the third port of the four-way valve (15) and the compressor (11). A three-way reversing valve (21) is installed at the second end of the first refrigerant branch (17) and the second end of the second refrigerant branch (18). The first end of the three-way reversing valve (21) is connected to the refrigerant pipeline (14) between the third port of the four-way valve (15) and the compressor (11). The second end of the three-way reversing valve (21) is connected to the second end of the first refrigerant branch (17). The third end of the three-way reversing valve (21) is connected to the second end of the second refrigerant branch (18). A first capillary tube (22) is installed on the first refrigerant branch (17), and a second capillary tube (23) is installed on the second refrigerant branch (18). A first fan (24) is provided near the first heat exchanger (12), and a second fan (25) is provided near the second heat exchanger (13).

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