Air conditioning system

Abstract

The present invention provides an air conditioning system according to the present invention, comprising: a first compressor, a gas-liquid separator connected to the air inlet end of the first compressor, a first heat exchanger connected to the air outlet end of the first compressor, the first heat exchanger connected to a second heat exchanger, and a second compressor, the air inlet end of the second compressor is connected to the gas-liquid separator, the air outlet end of the second compressor is connected to a third heat exchanger, and one end of the third heat exchanger is connected to the second heat exchanger. When the refrigeration capacity needs to be improved, the air conditioning system according to the present invention starts the second loop circulation, the first compressor and the second compressor are compressed in parallel, the refrigerant after the compression of the first compressor still dissipates heat through the first heat exchanger, and the capacity adjustment of the first compressor is still adjusted by the outlet water temperature of the first heat exchanger; the refrigerant compressed by the second compressor dissipates heat through the third heat exchanger, while improving the refrigeration capacity, it does not affect the output of the first heat exchanger.

Description

Technical Field

[0001] The present invention relates to the technical field of refrigeration and heating, and in particular to an air conditioning system. Background Art

[0002] Four-pipe cooling and hot water units are widely used in some special places such as hospitals. They can meet a variety of needs such as single cooling, single heating, and combined cooling and heating. However, the current products are prone to the problem of mismatch between cooling and heating capacity output and demand in combined cooling and heating. The most typical problem is that users want to increase the cooling capacity and lower the chilled water temperature, but do not want the hot water side to be affected. If the traditional method only adjusts the compressor according to the chilled water temperature, the hot water side capacity output will be greatly increased simultaneously. Summary of the invention

[0003] In order to solve the above problems, the present invention provides an air conditioning system, which can freely adjust the cooling capacity under the condition of ensuring the heating capacity.

[0004] An air conditioning system according to the present invention comprises: a first compressor, a gas-liquid separator connected to an air inlet end of the first compressor, a first heat exchanger connected to an air outlet end of the first compressor, the first heat exchanger connected to a second heat exchanger, and

[0005] A second compressor, an air inlet end of the second compressor is connected to the gas-liquid separator, an air outlet end of the second compressor is connected to the third heat exchanger, and one end of the third heat exchanger is connected to the second heat exchanger.

[0006] As a further optimization of the present invention, it also includes a first electronic expansion valve connected to the first compressor, and a second electronic expansion valve connected to the second compressor.

[0007] As a further optimization of the present invention, a first switch controller is provided between the second compressor and the gas-liquid separator.

[0008] As a further optimization of the present invention, it includes a first pipeline connected to the air inlet end of the second compressor, a second pipeline connected between the first compressor and the gas-liquid separator, the first pipeline is connected to the second pipeline, and the first switch controller is a proportional valve arranged on the first pipeline.

[0009] As a further optimization of the present invention, it also includes a first detection component for detecting the temperature of the first heat exchanger, and a second detection component for detecting the temperature of the second heat exchanger, the first detection component is electrically connected to the first compressor, and the second detection component is electrically connected to the second compressor.

[0010] As a further optimization of the present invention, it also includes a first one-way valve arranged between the first heat exchanger and the second heat exchanger.

[0011] As a further optimization of the present invention, it also includes a four-way valve connected to the first compressor, and a third pipeline connecting an opening of the four-way valve and the third heat exchanger, and a second switch controller is provided on the third pipeline.

[0012] As a further optimization of the present invention, it also includes a fourth pipeline connecting the third heat exchanger and the second compressor, the fourth pipeline is communicated with the third pipeline, and a third one-way valve is provided on the fourth pipeline.

[0013] As a further optimization of the present invention, it also includes a fifth pipeline connecting the third heat exchanger and the first heat exchanger, and a sixth pipeline connecting the third heat exchanger and the second heat exchanger, the sixth pipeline and the fifth pipeline are connected at the first connection, a third switch controller is provided on the fifth pipeline, and a fourth switch controller is provided on the sixth pipeline. The third switch controller is provided on the side of the first connection away from the third heat exchanger, and the fourth switch controller is provided on the side of the first connection away from the third heat exchanger.

[0014] As a further optimization of the present invention, it also includes a seventh pipeline connecting the fifth pipeline and the sixth pipeline, the seventh pipeline is connected to the sixth pipeline at a second connection, and the second connection is arranged on a side of the fourth switch controller away from the first connection.

[0015] Compared with the prior art, the present invention has the following beneficial effects:

[0016] The air-conditioning system described in the present invention starts the second loop circulation when the refrigeration capacity needs to be improved. The first compressor and the second compressor are compressed in parallel. The refrigerant after the first compressor is still dissipated through the first heat exchanger, and the capacity of the first compressor is still adjusted by adjusting the outlet water temperature of the first heat exchanger; the refrigerant compressed by the second compressor is dissipated through the third heat exchanger, which improves the refrigeration capacity without affecting the output of the first heat exchanger. BRIEF DESCRIPTION OF THE DRAWINGS

[0017] Hereinafter, the present invention will be described in more detail based on embodiments and with reference to the accompanying drawings.

[0018] Figure 1 is a schematic structural diagram of the air conditioning system of the present invention;

[0019] Figure 2 is a schematic diagram of the principle of the air conditioning system of the present invention;

[0020] Figure 3It is a schematic diagram of a refrigerant circuit in the cooling and heating combined supply mode of the air-conditioning system of the present invention;

[0021] Figure 4 It is a schematic diagram of a refrigerant circuit in a single cooling mode of the air-conditioning system of the present invention;

[0022] Figure 5 Schematic diagram of the refrigerant circuit of the air-conditioning system in heating-only mode according to the present invention.

[0023] In the drawings, the same reference numerals are used for the same components. The drawings are not drawn to scale. DETAILED DESCRIPTION

[0024] The present invention will be further described below in conjunction with the accompanying drawings.

[0025] like Figure 1-Figure 4 As shown, the present invention provides an air conditioning system, comprising: a first compressor 1, a gas-liquid separator 16 connected to the air inlet end of the first compressor 1 connected to a first heat exchanger 7 connected to the air outlet end of the first compressor 1, the first heat exchanger 7 connected to a second heat exchanger 6, and

[0026] The second compressor 8 , the air inlet end of the second compressor 8 is connected to the gas-liquid separator 16 , the air outlet end of the second compressor 8 is connected to the third heat exchanger 3 , and one end of the third heat exchanger 3 is connected to the second heat exchanger 6 .

[0027] The air-conditioning system described in the present invention starts the second loop circulation when it is necessary to improve the refrigeration capacity, and the first compressor 1 and the second compressor 8 are compressed in parallel. The refrigerant after compression by the first compressor 1 is still dissipated through the first heat exchanger 7, and the capacity adjustment of the first compressor 1 is still adjusted by the outlet water temperature of the first heat exchanger 7; the refrigerant compressed by the second compressor 8 is dissipated through the third heat exchanger 3, and while the refrigeration capacity is improved, it will not affect the output of the first heat exchanger 7. It should be noted that in this embodiment, the third heat exchanger 3 can be a fin radiator or other types of heat exchangers. It is preferably a currently idle radiator or other radiator that does not require precise control of output capacity.

[0028] As another embodiment of the present invention, different from the above embodiment, this embodiment also includes: a first switch controller 9 is provided between the second compressor 8 and the gas-liquid separator 16, so as to control the connection and disconnection between the second compressor 8 and the gas-liquid separator 16 as needed, effectively ensuring that the normal cooling and heating capacity of the first compressor 1 is not affected when not needed.

[0029] In another embodiment, it also includes a first electronic expansion valve 5 connected to the first compressor 1, and a second electronic expansion valve 4 connected to the second compressor 8. By controlling the first electronic expansion valve 5 and the second electronic expansion valve 4 respectively, the refrigeration capacity of the first compressor 1 and the refrigeration capacity of the second compressor 8 can be more conveniently controlled, thereby effectively controlling the output of the refrigeration and heating capacities.

[0030] In the above embodiment, it also includes a first pipeline 17 connected to the air inlet end of the second compressor 8, a second pipeline 18 connected between the first compressor 1 and the gas-liquid separator 16, the first pipeline 17 is connected to the second pipeline 18, and the first switch controller 9 is a proportional valve arranged on the first pipeline 17. The proportional valve can control the amount of refrigerant compressed by the second compressor 8 as needed, so that the first compressor 1 and the second compressor 8 can reasonably distribute the refrigerant as needed, thereby ensuring that the refrigeration capacity and heating capacity meet the needs at the same time.

[0031] In another embodiment, it also includes a first detection component 19 for detecting the temperature of the first heat exchanger 7, and a second detection component 20 for detecting the temperature of the second heat exchanger 6. The first detection component 19 is electrically connected to the first compressor 1, and the second detection component 20 is electrically connected to the second compressor 8. The refrigerant of the first compressor 1 dissipates heat through the first heat exchanger 7. In order to provide cooling capacity without affecting the heating output, the output of the first compressor 1 is controlled according to the temperature of the first heat exchanger 7. The setting of the first detection component 19 allows the output of the first compressor 1 to be adjusted in real time according to the temperature of the first heat exchanger 7. At the same time, the output of the second compressor 8 is controlled according to the temperature of the second heat exchanger 6. The setting of the second detection component 20 allows the output of the second compressor 8 to be adjusted in real time according to the temperature of the second heat exchanger 6, thereby ensuring precise control of cooling and heating.

[0032] In another embodiment, it also includes a first one-way valve 15 (1) disposed between the first heat exchanger 7 and the second heat exchanger 6, thereby effectively preventing the refrigerant from flowing back and ensuring the flow direction of the refrigerant between the first heat exchanger 7 and the second heat exchanger 6.

[0033] In another embodiment of the present invention, the present invention further comprises a four-way valve 2 connected to the first compressor 1, and a third pipeline 21 connecting an opening of the four-way valve 2 and the third heat exchanger 3, the third pipeline 21 being provided with a second switch controller 10, a fourth pipeline 22 connecting the third heat exchanger 3 and the second compressor 8, the fourth pipeline 22 being communicated with the third pipeline 21, the fourth pipeline 22 being provided with a third non-return valve 15 (3), a fifth pipeline 23 connecting the third heat exchanger 3 and the first heat exchanger 7, and a sixth pipeline 24 connecting the third heat exchanger 3 and the second heat exchanger 6, the sixth pipeline 24 being communicated with the third heat exchanger 6. The fifth pipeline 23 is connected to the first connection 25, the fifth pipeline 23 is provided with a third switch controller 12, the sixth pipeline 24 is provided with a fourth switch controller 11, the third switch controller 12 is provided on the side of the first connection 25 away from the third heat exchanger 3, the fourth switch controller 11 is provided on the side of the first connection 25 away from the third heat exchanger 3, the seventh pipeline 26 connecting the fifth pipeline 23 and the sixth pipeline 24, the seventh pipeline 26 and the sixth pipeline 24 are connected to the second connection 27, the second connection 27 is provided on the side of the fourth switch controller 11 away from the first connection 25, reference Figure 1 In this embodiment, other connected pipelines, a sixth switch controller 14, and a second one-way valve 15 (2) arranged on the pipeline are also included. In this embodiment, the second switch controller 10, the third switch controller 12, the fourth switch controller 11, the fifth switch controller 13 and the sixth switch controller 14 are all solenoid valves.

[0034] When this embodiment is in use, if it is in the combined supply mode, the second electronic expansion valve 4 is closed, the first switch controller 9 is closed, the second switch controller 10 is closed, the fourth switch controller 11 is closed, the third switch controller 12 is closed, the fifth switch controller 13 is closed, and the sixth switch controller 14 is opened. The main circuit of the refrigerant is: the first compressor 1, the four-way valve 2, the first heat exchanger 7, the first non-return valve 15 (1), the first electronic expansion valve 5, the second heat exchanger 6, the sixth switch controller 14, the second non-return valve 15 (2) and the gas-liquid separator 16, and finally flows back to the first compressor 1. At this time, the first compressor 1, the sixth switch controller 14, the first heat exchanger 7, and the second heat exchanger 6 in the system form a refrigeration cycle to realize the combined supply of cold and hot water.

[0035] like Figure 3As shown, when the cooling capacity needs to be increased, the valves are actuated: the first switch controller 9, the fifth switch controller 13, and the second electronic expansion valve 4 are opened. In addition to the main circuit, the second refrigerant circuit participates in the refrigeration. The second refrigerant circuit absorbs a part of the refrigerant from the main circuit for compression. The second refrigerant circuit is as follows: a gas-liquid separator 16, a first switch controller 9, a second compressor 8, a third one-way valve 15 (3), a third heat exchanger 3, a second electronic expansion valve 4, a fifth switch controller 13, a second heat exchanger 6, and a gas-liquid separator 16.

[0036] When running only cooling, Figure 4 As shown, the valve status is: the first electronic expansion valve 5, the first switch controller 9, the fourth switch controller 11, the third switch controller 12, and the fifth switch controller 13 are closed, and the second switch controller 10 and the sixth switch controller 14 are opened. The refrigerant circuit is: the first compressor 1, the four-way valve 2, the second switch controller 10, the third heat exchanger 3, the second electronic expansion valve 4, the fifth switch controller 13, the second heat exchanger 6, the sixth switch controller 14, the second non-return valve 15 (2), the gas-liquid separator 16 and the first compressor 1. When the refrigeration capacity is insufficient, it can also be as shown in the figure. Figure 3 As shown in , the second compressor 8 and the corresponding valve are turned on to realize dual compressor parallel refrigeration.

[0037] like Figure 5 As shown, in heating operation only, the valve status is: the first electronic expansion valve 5, the first switch controller 9, the fourth switch controller 11, the fifth switch controller 13 and the sixth switch controller 14 are closed, and the second switch controller 10 and the third switch controller 12 are opened. The refrigerant circuit is: the first compressor 1, the four-way valve 2, the first heat exchanger 7, the first non-return valve 15 (1), the third switch controller 12, the second electronic expansion valve 4, the third heat exchanger 3, the second switch controller 10, the four-way valve 2, the fourth non-return valve 15 (4), the gas-liquid separator 16, and the first compressor 1.

[0038] During defrosting, the first switch controller 9 is turned on, the second switch controller 10 is turned off, the first electronic expansion valve 5 is turned on, the third switch controller 12 is turned off, and the fifth switch controller 13 is turned on. At this time, the refrigerant flow direction becomes as follows Figure 3 As shown, the four-way valve 2 does not need to be operated, the refrigerant in the second circuit enters the third heat exchanger 3 for defrosting after being compressed by the second compressor 8, and the refrigerant in the main circuit still enters the first heat exchanger 7 for heat exchange after being compressed by the first compressor 1. The two refrigerants are finally throttled and merged into the second heat exchanger 6. This defrosting method avoids the operation of the four-way valve 2, and heating can be maintained during defrosting. The defrosting time and the balance of the degree of heating attenuation caused by defrosting can be freely adjusted by loading and unloading the second compressor 8.

[0039] In the description of the present invention, it is necessary to understand that the terms "upper", "lower", "bottom", "top", "front", "back", "inside", "outside", "left", "right", etc. indicate orientations or positional relationships 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, rather than indicating or implying 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.

[0040] Although the present invention has been described with reference to preferred embodiments, various modifications may be made thereto and parts thereof may be replaced by equivalents without departing from the scope of the present invention. In particular, the various technical features mentioned in the various embodiments may be combined in any manner as long as there are no structural conflicts. The present invention is not limited to the specific embodiments disclosed herein, but includes all technical solutions falling within the scope of the claims.

Claims

1. An air conditioning system, characterized in that: include: a first compressor, a gas-liquid separator connected to an air inlet of the first compressor, connected to a first heat exchanger connected to an air outlet of the first compressor, the first heat exchanger connected to a second heat exchanger, and a second compressor, wherein an air inlet end of the second compressor is connected to the gas-liquid separator, a first switch controller is provided between the second compressor and the gas-liquid separator, an air outlet end of the second compressor is connected to a third heat exchanger, one end of the third heat exchanger is connected to the second heat exchanger, and the second heat exchanger is connected to the gas-liquid separator; The air conditioning system further comprises: a first pipeline connected to the air inlet end of the second compressor, a second pipeline connected between the first compressor and the gas-liquid separator, the first pipeline is connected to the second pipeline, and the first switch controller is a proportional valve provided on the first pipeline; The air conditioning system further includes: a first electronic expansion valve connected to the first compressor, a second electronic expansion valve connected to the second compressor, and a first one-way valve disposed between the first heat exchanger and the second heat exchanger; The air conditioning system further comprises: a four-way valve connected to the first compressor, and a third pipeline connecting an opening of the four-way valve and the third heat exchanger, wherein a second switch controller is provided on the third pipeline; The air conditioning system further comprises: a fourth pipeline connecting the third heat exchanger and the second compressor, the fourth pipeline being in communication with the third pipeline, and a third one-way valve being disposed on the fourth pipeline; The air conditioning system comprises a main refrigerant circuit and a second refrigerant circuit, wherein the main refrigerant circuit is the first compressor, the four-way valve, the first heat exchanger, the first one-way valve, the first electronic expansion valve, the second heat exchanger, the sixth switch controller, the second one-way valve, the gas-liquid separator, and the first compressor through which the refrigerant flows in sequence; The second refrigerant circuit is the gas-liquid separator, the first switch controller, the second compressor, the third one-way valve, the third heat exchanger, the second electronic expansion valve, the fifth switch controller, the second heat exchanger, and the gas-liquid separator through which the refrigerant flows in sequence; Wherein, the second switch controller, the fifth switch controller and the sixth switch controller are all solenoid valves.

2. The air conditioning system according to claim 1, characterized in that: It also includes a first detection component for detecting the temperature of the first heat exchanger and a second detection component for detecting the temperature of the second heat exchanger. The first detection component is electrically connected to the first compressor, and the second detection component is electrically connected to the second compressor.

3. The air conditioning system according to claim 1, characterized in that: It also includes a fifth pipeline connecting the third heat exchanger and the first heat exchanger, and a sixth pipeline connecting the third heat exchanger and the second heat exchanger, the sixth pipeline and the fifth pipeline are connected at a first connection, a third switch controller is provided on the fifth pipeline, and a fourth switch controller is provided on the sixth pipeline. The third switch controller is provided on a side of the first connection away from the third heat exchanger, and the fourth switch controller is provided on a side of the first connection away from the third heat exchanger.

4. The air conditioning system according to claim 3, characterized in that: It also includes a seventh pipeline connecting the fifth pipeline and the sixth pipeline, the seventh pipeline is connected to the sixth pipeline at a second connection point, and the second connection point is arranged on a side of the fourth switch controller away from the first connection point.

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