CN215295413U - Air exhaust device and water chilling unit with same - Google Patents

Abstract

The disclosure relates to an air extraction device and a water chilling unit with the same. The air extraction device comprises a compression condensation component, a first evaporator, a second evaporator, an exhaust pump and a controller; the first evaporator comprises a first cavity, a first heat exchange coil arranged in the first cavity, and a first inlet, a first outlet and a second outlet which are communicated with the first cavity; the air outlet of the compression condensation component, at least one of the first heat exchange coil and the second heat exchange coil and the air suction port of the compression condensation component are sequentially communicated, and the first inlet and the first outlet are respectively communicated with the air outlet and the liquid return port of the first main loop condenser; the third inlet and the third outlet are respectively communicated with an exhaust port and a liquid return port of the second main loop condenser; the controller is used for controlling the gas exhaust of the first cavity and/or the second cavity.

Description

Air exhaust device and water chilling unit with same

Technical Field

The utility model relates to a heat pump technology field especially relates to an air exhaust device and have this air exhaust device's cooling water set.

Background

The low-pressure centrifugal units (such as CTV and ECTV) are widely applied to various refrigeration occasions due to the advantages of high efficiency, high reliability, low noise and the like, and part of air in the system is below atmospheric pressure due to the characteristic of low-pressure refrigerant, so that part of air can leak into the system, the part of air can influence the heat exchange performance of the system, the operation efficiency is reduced, and the normal operation of the system can be seriously hindered. The double-head water chilling unit is a common low-pressure centrifugal unit. The double-head water chilling unit comprises two compressors. Each compressor forms a refrigerant circuit with other components (e.g., condenser, evaporator, throttling device). In the related art, for a dual-head chiller, an air extractor is usually disposed for a low-pressure refrigerant system in which each compressor is located, so as to remove air from each low-pressure refrigerant system in the chiller.

SUMMERY OF THE UTILITY MODEL

According to a first aspect of embodiments of the present invention, there is provided an air extraction device for a water chiller, the water chiller including a first main loop condenser and a second main loop condenser which are independent of each other, the air extraction device including a compression condensation component, a first evaporator, a second evaporator, an exhaust pump and a controller;

the first evaporator comprises a first cavity, a first heat exchange coil arranged in the first cavity, and a first inlet, a first outlet and a second outlet which are communicated with the first cavity, and the second evaporator comprises a second cavity, a second heat exchange coil arranged in the second cavity, and a third inlet, a third outlet and a fourth outlet which are communicated with the second cavity;

the air outlet of the compression condensing assembly, at least one of the first heat exchange coil and the second heat exchange coil and the air suction port of the compression condensing assembly are sequentially communicated, the first inlet is communicated with the first exhaust port of the first main loop condenser, the first outlet is communicated with the first liquid return port of the first main loop condenser, and the second outlet is connected with the exhaust pump and can be used for exhausting air in the first cavity; the third inlet is communicated with a second exhaust port of the second main loop condenser, the third outlet is communicated with a second liquid return port of the second main loop condenser, and the fourth outlet is connected with the exhaust pump and can be used for exhausting gas in the second cavity;

the controller can be used for controlling the working state of the exhaust pump to exhaust the gas of the first cavity and/or the second cavity.

Optionally, the air extraction device further comprises a first air suction temperature sensor; the first air suction temperature sensor is arranged between the first heat exchange coil and an air suction port of the compression and condensation assembly and is electrically connected with the controller;

the controller is used for controlling the exhaust pump to exhaust gas in the first cavity when the temperature collected by the first air suction temperature sensor is smaller than a first temperature threshold value, and controlling the exhaust pump to stop exhausting gas from the first cavity when the temperature collected by the first air suction temperature sensor is larger than or equal to a second temperature threshold value.

Optionally, the air extraction device further includes a first control valve, the first control valve is disposed between the second outlet and the exhaust pump and electrically connected to the controller, and the first control valve is configured to control opening and closing of the second outlet;

when the temperature collected by the first air suction temperature sensor is lower than a first temperature threshold value, the controller controls the first control valve to be opened so as to control the second outlet to be communicated with the outside; when the temperature collected by the first air suction temperature sensor is greater than or equal to a second temperature threshold value, the controller controls the first control valve to be closed so as to control the second outlet to be isolated from the outside.

Optionally, the air extractor is provided with a first connecting pipeline connected with the first end of the first heat exchange coil and communicated with the first end opening of the first heat exchange coil, the first connecting pipeline is communicated with the air suction port of the compression and condensation component, and the first air suction temperature sensor is arranged in the first connecting pipeline; or the like, or, alternatively,

the air extracting device comprises a first exhaust pipeline communicated with the second outlet, the first control valve is arranged on the first exhaust pipeline, and the first exhaust pipeline is communicated with the exhaust pump.

Optionally, the air extracting device further comprises a second air suction temperature sensor; the second air suction temperature sensor is arranged between the second heat exchange coil and the air suction port of the compression and condensation assembly and is electrically connected with the controller; the controller controls the exhaust pump to exhaust the gas in the second cavity when the temperature acquired by the second air suction temperature sensor is smaller than a third temperature threshold, and controls the exhaust pump to stop exhausting the gas from the second cavity when the temperature acquired by the second air suction temperature sensor is larger than or equal to a fourth temperature threshold.

Optionally, the air extraction device further includes a second control valve, the second control valve is disposed between the fourth outlet and the exhaust pump and electrically connected to the controller, and the second control valve is configured to control opening and closing of the fourth outlet;

when the temperature collected by the second air suction temperature sensor is lower than a third temperature threshold value, the controller controls the second control valve to be opened so as to control the fourth outlet to be communicated with the outside; when the temperature collected by the second inspiration temperature sensor is larger than or equal to a fourth temperature threshold value, the controller controls the second control valve to be closed so as to control the fourth outlet to be isolated from the outside.

Optionally, the air extractor is provided with a second connecting pipeline connected with the first end of the second heat exchange coil and communicated with the opening of the first end of the second heat exchange coil, the second connecting pipeline is communicated with the air suction port of the compression and condensation component, and the second air suction temperature sensor is arranged in the second connecting pipeline; or the like, or, alternatively,

the air extracting device comprises a second exhaust pipeline communicated with the fourth outlet, the second control valve is arranged on the second exhaust pipeline, and the second exhaust pipeline is communicated with the exhaust pump.

Optionally, the first heat exchange coil and the second heat exchange coil are arranged in parallel, an air outlet of the compression condensation component, the first heat exchange coil and an air suction port of the compression condensation component are sequentially communicated, and an air outlet of the compression condensation component, the second heat exchange coil and an air suction port of the compression condensation component are sequentially communicated;

the air exhaust device comprises a first control unit and a second control unit; the first control unit is arranged between the air outlet of the compression condensation component and the second end of the first heat exchange coil, and the second control unit is arranged between the air outlet of the compression condensation component and the second end of the second heat exchange coil.

The air extracting device comprises a third control valve, a fourth control valve and a fifth control valve; the third control valve is arranged between the gas outlet of the compression condensation component and the second end of the first heat exchange coil, the fourth control valve and the fifth control valve are sequentially arranged between the gas outlet of the compression condensation component and the suction port of the compression condensation component through pipelines, and the first end opening of the first heat exchange coil is communicated with the pipeline between the fourth control valve and the fifth control valve through a pipeline.

According to a second aspect of the embodiments of the present invention, there is provided a water chiller, the water chiller comprising a first main circuit condenser, a second main circuit condenser and an air extractor as described above;

the water chilling unit also comprises a first main loop compressor, a second main loop compressor, a first main loop evaporator, a second main loop evaporator, a first main loop throttling device and a second main loop throttling device; wherein the content of the first and second substances,

said first main circuit compressor, said first main circuit condenser, said first main circuit throttling device and said first main circuit evaporator being in sequential communication to form a first main refrigerant circuit; the second main circuit compressor, the second main circuit condenser, the second main circuit throttling device and the second main circuit evaporator are communicated in sequence to form a second main refrigerant circuit; the first main refrigerant circuit and the second main refrigerant circuit are isolated from each other.

The air extraction device and the water chilling unit with the air extraction device provided by the embodiment of the application comprise a compression condensation assembly, an exhaust pump, a controller, a first evaporator and a second evaporator, and the air extraction device can exhaust the refrigerant circuits of the first main circuit condenser and the second main circuit condenser at the same time. And the air extraction device is provided with the first evaporator and the second evaporator, so that when the refrigerant circuits of the first main circuit condenser and the second main circuit condenser are simultaneously exhausted, the refrigerant migration of the refrigerant circuits of the first main circuit condenser and the second main circuit condenser is well avoided.

Drawings

Fig. 1 is a schematic structural diagram of a water chiller according to an exemplary embodiment of the present application;

FIG. 2 is a schematic view of a gas evacuation device according to an exemplary embodiment of the present application;

FIG. 3 is a schematic diagram of the connection of an air extraction device and the first and second main circuit condensers according to an exemplary embodiment of the present application;

FIG. 4 is a schematic view of another extraction device and the connection of the first and second main circuit condensers according to an exemplary embodiment of the present application.

Detailed Description

Reference will now be made in detail to the exemplary embodiments, examples of which are illustrated in the accompanying drawings. When the following description refers to the accompanying drawings, like numbers in different drawings represent the same or similar elements unless otherwise indicated. The embodiments described in the following exemplary embodiments do not represent all embodiments consistent with the present invention. Rather, they are merely examples of apparatus and methods consistent with certain aspects of the invention, as detailed in the appended claims.

The terminology used herein is for the purpose of describing particular embodiments only and is not intended to be limiting of the invention. As used in this specification and the appended claims, the singular forms "a", "an", and "the" are intended to include the plural forms as well, unless the context clearly indicates otherwise. It should also be understood that the term "and/or" as used herein refers to and encompasses any and all possible combinations of one or more of the associated listed items.

It should be understood that the terms "first," "second," and the like as used in the description and in the claims, do not denote any order, quantity, or importance, but rather are used to distinguish one element from another. Also, the use of the terms "a" or "an" and the like do not denote a limitation of quantity, but rather denote the presence of at least one. Unless otherwise specified, "front", "back", "lower" and/or "upper", "lower", "left", "right", and the like are for ease of description and are not limited to one position or one spatial orientation. The word "comprising" or "comprises", and the like, means that the element or item identified as preceding "comprises" or "comprising" covers the element or item identified as following "comprising" or "comprises" and its equivalents, and does not exclude other elements or items. The terms "connected" or "coupled" and the like are not restricted to physical or mechanical connections, but may include electrical connections, whether direct or indirect.

The embodiments of the present invention will be described in detail below with reference to the accompanying drawings. The features of the following examples and embodiments may be combined with each other without conflict.

Fig. 1 is a schematic structural diagram of a water chiller 1000 according to an exemplary embodiment of the present application. Referring to fig. 1, the chiller 1000 includes a first main circuit condenser 210, a second main circuit condenser 310, a first main circuit compressor 220, a second main circuit compressor 320, a first main circuit evaporator (not shown), a second main circuit evaporator (not shown), a first main circuit throttling device (not shown), and a second main circuit throttling device (not shown). The first main circuit compressor 220, the first main circuit condenser 210, the first main circuit throttling device and the first main circuit evaporator are in sequential communication to form a first main refrigerant circuit. The second main circuit compressor 320, the second main circuit condenser 310, the second main circuit throttling device and the second main circuit evaporator are communicated in series to form a second main refrigerant circuit. The first main circuit condenser 210 and the second main circuit condenser 310 are provided independently of each other, the first main circuit compressor 220 and the second main circuit compressor 320 are provided independently of each other, and the first main circuit evaporator and the second main circuit evaporator are provided independently of each other. The first main loop throttling device and the second main loop throttling device are arranged independently. The first main refrigerant circuit and the second main refrigerant circuit are isolated from each other.

Further, the water chilling unit also comprises an air extraction device. FIG. 2 is a schematic view of a gas evacuation device 100 according to an exemplary embodiment of the present application. FIG. 3 is a schematic diagram of the connection of an air extraction device 100 to a first main circuit condenser 210 and a second main circuit condenser 310 according to an exemplary embodiment of the present application. Referring to fig. 2, and as necessary with reference to fig. 1 and 3, the air-extracting device 100 includes a compression-condensation unit, a first evaporator 30, a second evaporator 40, an exhaust pump 50 and a controller.

The first evaporator 30 includes a first cavity 35, a first heat exchange coil 34 disposed in the first cavity 35, and a first inlet 31, a first outlet 32 and a second outlet 33 communicated with the first cavity 35, and the second evaporator 40 includes a second cavity 45, a second heat exchange coil 44 disposed in the second cavity 45, and a third inlet 41, a third outlet 42 and a fourth outlet 43 communicated with the second cavity 45.

In the air extractor 100, the first heat exchange coil 34 and the second heat exchange coil 35 are arranged in parallel. The air outlet 21 of the compression condensing assembly, the first heat exchange coil 34 and the air suction port 11 of the compression condensing assembly are sequentially communicated, the first inlet 31 is communicated with the first exhaust port 211 of the first main loop condenser 210, the first outlet 32 is communicated with the first liquid return port 212 of the first main loop condenser 210, and the second outlet 33 is connected with the exhaust pump 50 and can be used for exhausting the gas in the first cavity 35. The air outlet 21 of the compression condensing assembly, the second heat exchange coil 44 and the air suction port 11 of the compression condensing assembly are sequentially communicated, the third inlet 41 is communicated with the second air outlet 311 of the second main loop condenser 310, the third outlet 42 is communicated with the second liquid return port 312 of the second main loop condenser 310, and the fourth outlet 43 is connected with the exhaust pump 50 and can be used for exhausting the air in the second cavity 45.

The controller can be used to control the operating state of the exhaust pump 50 to exhaust the gas of the first chamber 35 and/or the second chamber 45.

The compression and condensation assembly may include a compressor 10 and a condenser 20. The outlet of the compressor 10 communicates with the inlet of the condenser 20. The suction 11 of the compression and condensation unit can be understood as the suction of the compressor 10. The outlet 21 of the compression and condensation unit is understood to be the outlet of the condenser 20.

Further, in some embodiments, the air extraction device 100 also includes a first air intake temperature sensor 80. The first air suction temperature sensor 80 is arranged between the first heat exchange coil 34 and the air suction port 11 of the compression and condensation assembly and is electrically connected with the controller.

The controller may be configured to control the exhaust pump 50 to exhaust the gas from the first chamber 35 when the temperature sensed by the first intake temperature sensor 80 is less than a first temperature threshold, and to control the exhaust pump 50 to stop exhausting the gas from the first chamber 35 when the temperature sensed by the first intake temperature sensor 80 is greater than or equal to a second temperature threshold.

Further, in some embodiments, the gas exhaust apparatus 100 further includes a first control valve 60, the first control valve 60 is disposed between the second outlet 33 and the exhaust pump 50 and electrically connected to the controller, and the first control valve 60 is used for controlling the opening and closing of the second outlet 33.

When the temperature collected by the first intake temperature sensor 80 is less than the first temperature threshold, the controller controls the first control valve 60 to open to control the second outlet 33 to communicate with the outside. So that the controller can control the exhaust pump 50 to exhaust the gas in the first chamber 35. When the temperature sensed by the first suction temperature sensor 80 is greater than or equal to the second temperature threshold, the controller controls the first control valve 60 to be closed to control the second outlet 33 to be isolated from the outside.

Further, the air extractor 100 is provided with a first connection pipe 170 connected to the first end 341 of the first heat exchanging coil 34 and in open communication with the first end 341 of the first heat exchanging coil 34, the first connection pipe 170 is communicated with the air suction port 11 of the compression and condensation component, and the first air suction temperature sensor 80 is disposed in the first connection pipe 170.

Further, the method is simple. The air extractor 100 comprises a first exhaust duct 191 communicated with the second outlet 33, the first control valve 60 is arranged on the first exhaust duct 191, and the first exhaust duct 191 is communicated with the exhaust pump 50.

Further, the air extraction device 100 also comprises a second air suction temperature sensor 90; the second air suction temperature sensor 90 is arranged between the second heat exchange coil 44 and the air suction port 11 of the compression and condensation assembly and is electrically connected with the controller; the controller controls the exhaust pump 50 to exhaust the gas in the second chamber 45 when the temperature acquired by the second intake temperature sensor 90 is less than the third temperature threshold, and controls the exhaust pump 50 to stop exhausting the gas from the second chamber 45 when the temperature acquired by the second intake temperature sensor 90 is greater than or equal to the fourth temperature threshold.

The third temperature threshold may be equal to or different from the first temperature threshold. The fourth temperature threshold value may be equal to or different from the second temperature threshold value. The refrigerant circuit can be set according to the specific situation of the water chilling unit, and the application is not limited to this.

Further, the air extraction device 100 further includes a second control valve 70, the second control valve 70 is disposed between the fourth outlet 43 and the exhaust pump 50 and electrically connected to the controller, and the second control valve 70 is used for controlling the opening and closing of the fourth outlet 43.

When the temperature collected by the second suction temperature sensor 90 is less than the third temperature threshold, the controller controls the second control valve 70 to open to control the fourth outlet 43 to communicate with the outside, so that the controller may control the exhaust pump 50 to exhaust the gas in the second chamber 45. When the temperature sensed by the second intake air temperature sensor 90 is greater than or equal to the fourth temperature threshold, the controller controls the second control valve 70 to be closed to control the fourth outlet 43 to be isolated from the outside.

It should be noted that the controller controls the exhaust pump 50 to start when at least one of the first chamber 35 and the second chamber 45 needs to exhaust gas. Optionally, when the first cavity 35 and the second cavity 45 do not need to exhaust gas, for example, the temperature collected by the first intake temperature sensor 80 is greater than or equal to the second temperature threshold and the temperature collected by the second intake temperature sensor 90 is greater than or equal to the fourth temperature threshold, the controller controls the exhaust pump 50 to stop working. When the gas in the first chamber 35 is exhausted, for example, when the temperature collected by the first intake temperature sensor 80 is less than the first temperature threshold, the controller may control the first control valve 60 to open and control the exhaust pump 50 to start operating. When the temperature sensed by first intake temperature sensor 80 is greater than or equal to the second temperature threshold, the controller controls first control valve 60 to close. When the gas in the second chamber 45 needs to be exhausted, for example, the temperature collected by the second intake temperature sensor 90 is less than the third temperature threshold, the controller may control the second control valve 70 to open and control the exhaust pump 50 to start operating. When the temperature sensed by the second intake air temperature sensor 90 is greater than or equal to the fourth temperature threshold, the controller controls the second control valve 70 to close.

Optionally, if the gas in the first cavity 35 and the gas in the second cavity 45 need to be exhausted in a certain period of time, the gas in the first cavity 35 and the gas in the second cavity 45 can be exhausted at the same time under the control of the controller.

Further, the air extractor 100 is provided with a second connecting pipe 180 connected with the first end 441 of the second heat exchanging coil 44 and communicated with the opening of the first end 441 of the second heat exchanging coil 44, the second connecting pipe 180 is communicated with the air suction port 11 of the compression and condensation assembly, and the second air suction temperature sensor 90 is arranged in the second connecting pipe 180.

It should be noted that the second connecting pipe 180 and the outer end of the first connecting pipe 170 may be integrated into one connecting pipe, and the integrated connecting pipe may communicate with the suction port 11 of the compression and condensation unit.

Further, the air extracting device 100 includes a second exhaust pipe 192 communicated with the fourth outlet 43, the second control valve 70 is provided on the second exhaust pipe 192, and the second exhaust pipe 192 is communicated with the exhaust pump 50.

It should be noted that the second exhaust duct 192 and the outer end of the first exhaust duct 191 may be integrated into one exhaust duct, and the exhaust pump 50 may be provided on the duct.

Further, the gas evacuation device 100 includes a first control unit 110 and a second control unit 120. The first control unit 110 is disposed between the air outlet 21 of the compression and condensation assembly and the second end 342 of the first heat exchange coil 34, and the second control unit 120 is disposed between the air outlet 21 of the compression and condensation assembly and the second end 442 of the second heat exchange coil 44.

In some embodiments, the first control unit 110 may be a throttling element. In other embodiments, the first control unit may be a control valve or a control assembly comprising a throttling element and a control valve. Wherein the control valve can be electrically connected to the controller, so that the controller can control the amount of the refrigerant flowing into the first heat exchange coil 34 or whether the refrigerant is flowing into the first heat exchange coil 34 according to the amount of the non-condensable gas in the first main refrigerant circuit. For example, when the amount of non-condensable gases in the first main refrigerant circuit is large, the refrigerant in the air extractor circuit may be controlled to flow to the first heat exchanging coil 34, so as to exchange heat with the refrigerant flowing from the first main refrigerant circuit into the first cavity 35 through the first heat exchanging coil 34, so as to separate out and discharge the non-condensable gases in the first main refrigerant circuit.

Accordingly, the second control unit 120 may be a throttling element. In other embodiments, the first control unit may be a control valve or a control assembly comprising a throttling element and a control valve. Wherein the control valve can be electrically connected to the controller, so that the controller can control the amount of the refrigerant flowing into the second heat exchange coil 44 or whether the refrigerant is flowing into the second heat exchange coil 44 according to the amount of the non-condensable gas in the second main refrigerant circuit. For example, when the amount of non-condensable gases in the second main refrigerant circuit is large, the refrigerant in the air extractor circuit may be controlled to flow to the second heat exchanging coil 44, so as to exchange heat with the refrigerant flowing from the second main refrigerant circuit condenser 310 into the second cavity 45 through the second heat exchanging coil 44, so as to separate out the non-condensable gases in the second main refrigerant circuit for discharge.

FIG. 4 is a schematic view of another exemplary embodiment of the present application showing the connection of the extraction device 100' to the first and second main circuit condensers. The air exhaust apparatus 100' shown in FIG. 4 is substantially the same as the air exhaust apparatus 100 shown in FIG. 3, and the same or similar components are denoted by the same reference numerals, and the related description can refer to the related description of the air exhaust apparatus 100, which is not repeated herein. The difference is that in the air extractor 100, the first heat exchanging coil 34 and the second heat exchanging coil 35 are arranged in parallel. And the first heat exchanging coil 34 and the second heat exchanging coil 35 of the air extractor 100' can be arranged in series. The following description will be made mainly of differences between the air extractor 100' and the air extractor 100 described above.

Referring to FIG. 4, the gas extraction device 100 'includes a third control valve 110', a fourth control valve 120 'and a fifth control valve 130'. The third control valve 110 ' is disposed between the air outlet 21 of the compression and condensation unit and the second end 342 of the first heat exchange coil 34, and the fourth control valve 120 ' and the fifth control valve 130 ' are sequentially disposed between the air outlet 21 of the compression and condensation unit and the air suction port 11 of the compression and condensation unit through a pipeline. The first end 341 of the first heat exchanging coil 34 is open to the conduit 150 'between the fourth control valve 120' and the fifth control valve 130 'via conduit 170'. In the air extraction device 100 ', the first intake temperature sensor 80 may be specifically provided on the duct 170'.

In some embodiments, the third, fourth, and fifth control valves 110 ', 120 ', 130 ' may be solenoid valves. The third control valve 110 ', the fourth control valve 120' and the fifth control valve 130 'are electrically connected to the controller, so that the controller controls the opening and closing of the third control valve 110', the fourth control valve 120 'and the fifth control valve 130' to control the circulation of the refrigerant flowing through the first heat exchanging coil 34 and the second heat exchanging coil 44.

In some embodiments, the gas evacuation device 100 'may also include a flow restriction device 140'. Alternatively, the throttle device 140' may be an expansion valve, or may be other structures with throttling function. The present application is not limited to this, and may be set according to a specific application environment.

Based on the above structure, when the first main refrigerant circuit and the second main refrigerant circuit need to be exhausted, the third control valve 110 'that can control the air extracting device 100' is opened, and the fourth control valve 120 'and the fifth control valve 130' are closed. In this way, the air outlet 21 of the compression and condensation assembly, the first heat exchange coil 34, the second heat exchange coil 44 and the air suction port 11 of the compression and condensation assembly are communicated in sequence. The first heat exchange coil 34 and the second heat exchange coil 35 are connected in a manner understood to be in a series arrangement.

Specifically, after flowing out from the air outlet 21 of the compression and condensation assembly, the refrigerant in the air extractor 100 ' may sequentially flow through the throttling device 140 ', the third control valve 110 ', the first heat exchanging coil 34, flow into the second heat exchanging coil 44 through the pipe 170 ', the pipe 150 ', and finally flow back to the air inlet 11 of the compression and condensation assembly. So that the refrigerant flowing from the first main circuit condenser 210 into the first refrigerant main circuit in the first cavity 35 can exchange heat with the refrigerant through the first heat exchange coil 34, so as to separate out the non-condensable gas of the first refrigerant main circuit for discharge. And exchanges heat with the refrigerant of the second main refrigerant circuit flowing from the second main circuit condenser 310 into the second chamber 45 through the second heat exchange coil 44, so as to separate out the non-condensable gas of the second main refrigerant circuit and discharge the separated gas.

Based on the above structure, when the non-condensable gas in the first main refrigerant circuit needs to be exhausted more and the second main refrigerant circuit does not need to be exhausted, the third control valve 110 'and the fifth control valve 130' of the air-extracting device 100 'can be controlled to be opened, and the fourth control valve 120' is controlled to be closed. In this way, the air outlet 21 of the compression and condensation assembly, the first heat exchange coil 34 and the air suction port 11 of the compression and condensation assembly are communicated in sequence. Specifically, after flowing out from the air outlet 21 of the compression and condensation assembly, the refrigerant in the air extractor 100 ' may sequentially flow through the throttling device 140 ', the third control valve 110 ', the first heat exchanging coil 34, flow into the second heat exchanging coil 44 through the pipe 170 ', the pipe 150 ', and finally flow back to the air inlet 11 of the compression and condensation assembly.

Specifically, after flowing out from the air outlet 21 of the compression and condensation assembly, the refrigerant in the air extractor 100 'may sequentially flow through the throttling device 140', the third control valve 110 ', the first heat exchanging coil 34, and then flow back to the air inlet 11 of the compression and condensation assembly through the pipe 170', the pipe 150 ', and the fifth control valve 130'. So that the refrigerant flowing from the first main circuit condenser 210 into the first refrigerant main circuit in the first cavity 35 can exchange heat with the refrigerant through the first heat exchange coil 34, so as to separate out the non-condensable gas of the first refrigerant main circuit for discharge.

Based on the above structure, when the non-condensable gas in the second main refrigerant circuit needs to be exhausted more and the first main refrigerant circuit does not need to be exhausted, the fourth control valve 120 'of the air-extracting device 100' can be controlled to be opened, and the third control valve 110 'and the fifth control valve 130' are controlled to be closed. In this way, the air outlet 21 of the compression and condensation assembly, the second heat exchange coil 44 and the air suction port 11 of the compression and condensation assembly are communicated in sequence.

Specifically, after flowing out from the air outlet 21 of the compression and condensation assembly, the refrigerant in the air extractor 100 'may sequentially flow through the throttling device 140', the fourth control valve 120 ', and flow into the second heat exchanging coil 44 through the pipe 150', and finally flow back to the air inlet 11 of the compression and condensation assembly. So that the refrigerant flowing from the second main circuit condenser 310 into the second refrigerant main circuit in the second chamber 45 can exchange heat with the refrigerant through the second heat exchange coil 44, and the non-condensable gas in the second refrigerant main circuit is separated and discharged.

The above description is only a preferred embodiment of the present invention, and is not intended to limit the present invention in any way, and although the present invention has been disclosed with reference to the above embodiments, but not to limit the present invention, any person skilled in the art can make modifications or changes to equivalent embodiments without departing from the scope of the present invention, and any simple modification, equivalent change and modification made to the above embodiments by the technical spirit of the present invention still fall within the scope of the present invention.

Claims (10)

1. An air extraction device is applied to a water chilling unit, the water chilling unit comprises a first main loop condenser (210) and a second main loop condenser (310) which are mutually independent, and the air extraction device is characterized by comprising a compression condensation component, a first evaporator (30), a second evaporator (40), an exhaust pump (50) and a controller;

the first evaporator (30) comprises a first cavity (35), a first heat exchange coil (34) arranged in the first cavity (35), a first inlet (31), a first outlet (32) and a second outlet (33) which are communicated with the first cavity (35), and the second evaporator (40) comprises a second cavity (45), a second heat exchange coil (44) arranged in the second cavity (45), and a third inlet (41), a third outlet (42) and a fourth outlet (43) which are communicated with the second cavity (45);

the air outlet (21) of the compression and condensation assembly, at least one of the first heat exchange coil (34) and the second heat exchange coil (44), and the air suction port (11) of the compression and condensation assembly are sequentially communicated, the first inlet (31) is communicated with the first exhaust port (211) of the first main loop condenser (210), the first outlet (32) is communicated with the first liquid return port (212) of the first main loop condenser (210), and the second outlet (33) is connected with the exhaust pump (50) and can be used for exhausting the gas in the first cavity (35); the third inlet (41) is communicated with a second exhaust port (311) of the second main loop condenser (310), the third outlet (42) is communicated with a second liquid return port (312) of the second main loop condenser (310), and the fourth outlet (43) is connected with the exhaust pump (50) and can be used for exhausting gas of the second cavity (45);

the controller can be used to control the operating state of the exhaust pump (50) to exhaust the gas of the first chamber (35) and/or the second chamber (45).

2. The air extraction apparatus according to claim 1, further comprising a first air extraction temperature sensor (80); the first air suction temperature sensor (80) is arranged between the first heat exchange coil (34) and an air suction port (11) of the compression and condensation assembly and is electrically connected with the controller;

the controller can be configured to control the exhaust pump (50) to exhaust gas from the first chamber (35) when the temperature sensed by the first intake temperature sensor (80) is less than a first temperature threshold, and to control the exhaust pump (50) to stop exhausting gas from the first chamber (35) when the temperature sensed by the first intake temperature sensor (80) is greater than or equal to a second temperature threshold.

3. The gas extraction apparatus according to claim 2, further comprising a first control valve (60), wherein the first control valve (60) is disposed between the second outlet (33) and the exhaust pump (50) and electrically connected to the controller, and the first control valve (60) is used for controlling the opening and closing of the second outlet (33);

when the temperature collected by the first air suction temperature sensor (80) is smaller than a first temperature threshold value, the controller controls the first control valve (60) to be opened so as to control the second outlet (33) to be communicated with the outside; when the temperature collected by the first suction temperature sensor (80) is greater than or equal to a second temperature threshold, the controller controls the first control valve (60) to close to control the second outlet (33) to be isolated from the outside.

4. The air extractor according to claim 3, characterized in that it is provided with a first connecting duct (170) connected to the first end (341) of the first heat exchange coil and in open communication with the first end (341) of the first heat exchange coil, said first connecting duct (170) being in communication with the suction opening (11) of the compression and condensation assembly, said first suction temperature sensor (80) being provided inside said first connecting duct (170); or the like, or, alternatively,

the air extracting device comprises a first exhaust pipeline (191) communicated with the second outlet (33), the first control valve (60) is arranged on the first exhaust pipeline (191), and the first exhaust pipeline (191) is communicated with the exhaust pump (50).

5. The suction device according to claim 1, characterized in that it further comprises a second suction temperature sensor (90); the second air suction temperature sensor (90) is arranged between the second heat exchange coil (44) and the air suction port (11) of the compression and condensation assembly and is electrically connected with the controller; the controller controls the exhaust pump (50) to exhaust the gas in the second cavity (45) when the temperature acquired by the second air suction temperature sensor (90) is smaller than a third temperature threshold, and controls the exhaust pump (50) to stop exhausting the gas from the second cavity (45) when the temperature acquired by the second air suction temperature sensor (90) is larger than or equal to a fourth temperature threshold.

6. The gas exhaust apparatus according to claim 5, further comprising a second control valve (70), wherein the second control valve (70) is disposed between the fourth outlet (43) and the exhaust pump (50) and electrically connected to the controller, and the second control valve (70) is used for controlling the opening and closing of the fourth outlet (43);

when the temperature collected by the second inspiration temperature sensor (90) is lower than a third temperature threshold, the controller controls the second control valve (70) to be opened so as to control the fourth outlet (43) to be communicated with the outside; when the temperature collected by the second inspiration temperature sensor (90) is greater than or equal to a fourth temperature threshold, the controller controls the second control valve (70) to close so as to control the fourth outlet (43) to be isolated from the outside.

7. The air extractor according to claim 6, characterized in that it is provided with a second connecting duct (180) connected to the first end (441) of said second heat exchange coil and in open communication with the first end (441) of said second heat exchange coil, said second connecting duct (180) being in communication with the suction opening (11) of said compression condensation assembly, said second suction temperature sensor (90) being provided inside said second connecting duct (180); or the like, or, alternatively,

the air extracting device comprises a second exhaust pipeline (192) communicated with the fourth outlet (43), the second control valve (70) is arranged on the second exhaust pipeline (192), and the second exhaust pipeline (192) is communicated with the exhaust pump (50).

8. The air extractor according to claim 1, wherein the first heat exchanging coil (34) and the second heat exchanging coil (44) are arranged in parallel, the air outlet (21) of the compression and condensation assembly, the first heat exchanging coil (34), and the air suction opening (11) of the compression and condensation assembly are communicated in sequence, and the air outlet (21) of the compression and condensation assembly, the second heat exchanging coil (44), and the air suction opening (11) of the compression and condensation assembly are communicated in sequence;

the air extraction device comprises a first control unit (110) and a second control unit (120); the first control unit (110) is arranged between the air outlet (21) of the compression condensation assembly and the second end (342) of the first heat exchange coil, and the second control unit (120) is arranged between the air outlet (21) of the compression condensation assembly and the second end (442) of the second heat exchange coil.

9. The gas-withdrawal apparatus according to claim 1, characterized in that it comprises a third control valve (110 '), a fourth control valve (120 ') and a fifth control valve (130 '); the third control valve (110 ') is arranged between the air outlet (21) of the compression and condensation assembly and the second end (342) of the first heat exchange coil, the fourth control valve (120 ') and the fifth control valve (130 ') are sequentially arranged between the air outlet (21) of the compression and condensation assembly and the air suction port (11) of the compression and condensation assembly through pipelines, and the opening of the first end (341) of the first heat exchange coil is communicated with the pipeline between the fourth control valve (120 ') and the fifth control valve (130 ') through a pipeline.

10. A water chilling unit, characterized in that it comprises a first main circuit condenser (210) and a second main circuit condenser (310) and an air extraction device according to any one of claims 1 to 9;

the water chilling unit further comprises a first main loop compressor (220), a second main loop compressor (320), a first main loop evaporator, a second main loop evaporator, a first main loop throttling device and a second main loop throttling device; wherein the content of the first and second substances,

the first main circuit compressor (220), the first main circuit condenser (210), the first main circuit throttling device and the first main circuit evaporator are communicated in sequence to form a first main refrigerant circuit; the second main circuit compressor (320), the second main circuit condenser (310), the second main circuit throttling device and the second main circuit evaporator are communicated in sequence to form a second main refrigerant circuit; the first main refrigerant circuit and the second main refrigerant circuit are isolated from each other.

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