CN210718179U - Air exhaust purification system and water chilling unit with same - Google Patents

Abstract

The utility model provides an air extraction purification system and a water chilling unit with the same, wherein the air extraction purification system comprises a compression condensing unit, a first expansion device, a first evaporator, an ambient temperature sensor and a controller; the first evaporator comprises a cavity, a coil pipe, a first inlet, a first outlet and a second outlet, an air outlet of the compression condensing unit, the first expansion device, the coil pipe and an air suction port of the compression condensing unit are sequentially communicated, the first inlet is communicated with the first exhaust port, the first outlet is communicated with the liquid return port, and the second outlet is used for discharging air in the cavity; when the ambient temperature is less than the first temperature threshold, the controller controls the first expansion device to be in a first operating state; when the ambient temperature is greater than or equal to the first temperature threshold, the controller controls the first expansion device to be in a second operation state; the working pressure of the first expansion device in the first operating state is lower than the working pressure of the first expansion device in the second operating state.

Description

Air exhaust purification system and water chilling unit with same

Technical Field

The utility model relates to an air conditioner field especially relates to a purification system and have this purification system's that bleeds cooling water set bleeds.

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.

An air extraction and purification system is usually designed outside the low pressure system to remove air from the system. For the reason of environmental protection, the content of refrigerant in the air discharged by the standard regulation must be reduced to a certain value, so that a pressure maintaining valve (working pressure is constant) corresponding to a relatively low saturation temperature is arranged in the air extraction purification system in order to achieve the purpose, and a relatively low refrigerant discharge amount is ensured.

SUMMERY OF THE UTILITY MODEL

The utility model provides an air exhaust purification system and a water chilling unit with the same.

Specifically, the utility model discloses a realize through following technical scheme:

according to a first aspect of the present invention, there is provided an air-extracting and purifying system for a water chilling unit, the water chilling unit including a first condenser, the air-extracting and purifying system including a compression condensing unit, a first expansion device, a first evaporator, an ambient temperature sensor and a controller, the first evaporator including a cavity, a coil pipe disposed in the cavity, and a first inlet, a first outlet and a second outlet communicated with the cavity;

the air outlet of the compression condensing unit, the first expansion device, the coil pipe and the air suction port of the compression condensing unit are sequentially communicated, the first inlet is communicated with the first exhaust port of the first condenser, the first outlet is communicated with the liquid return port of the first condenser, and the second outlet can be used for discharging air in the cavity;

the ambient temperature sensor is electrically connected with the controller, the controller collects ambient temperature through the ambient temperature sensor, and the controller controls the first expansion device to be in a first operation state when the ambient temperature is less than a first temperature threshold value; the controller controls the first expansion device to be in a second operating state when the ambient temperature sensor is greater than or equal to the first temperature threshold;

wherein a working pressure of the first expansion device in the first operating condition is less than a working pressure of the first expansion device in the second operating condition.

Optionally, the first condenser is a water-cooled condenser, and the air-extracting purification system further includes an inlet water temperature sensor electrically connected to the controller;

the controller acquires the water inlet temperature of the first condenser through the water inlet temperature sensor, and controls the first expansion device to be in a first operation state when the environment temperature is less than a first temperature threshold value and the water inlet temperature is less than a second temperature threshold value; the controller controls the first expansion device to be in a second operating state when the ambient temperature sensor is greater than or equal to the first temperature threshold, or when the incoming water temperature is greater than or equal to the second temperature threshold.

Optionally, the bleed air purification system further comprises a second expansion device electrically connected to the controller;

the controller controls the opening degree of the second expansion device to be a preset opening degree when the ambient temperature is smaller than the first temperature threshold; and the controller controls the opening degree of the second expansion device to be smaller than the preset opening degree when the ambient temperature is greater than or equal to the first temperature threshold value.

Optionally, the water chilling unit further comprises a cooling liquid circulation flow path;

the air extraction and purification system also comprises a heat exchanger and a first control valve, the first inlet is communicated with the outlet of the first condenser through the heat exchanger, and the first control valve is used for controlling whether the heat exchanger is communicated with the cooling liquid circulation flow path or not;

the controller controls the first control valve to be in a closed state when the ambient temperature is less than the first temperature threshold value, so that the heat exchanger and the cooling liquid circulation flow path are cut off; and when the ambient temperature is greater than or equal to the first temperature threshold value, the controller controls the first control valve to be in an open state, so that the heat exchanger is communicated with the cooling liquid circulation flow path, and the heat exchanger is used for cooling the gas discharged from the outlet of the first condenser.

Optionally, the heat exchanger is a coil heat exchanger.

Optionally, the first expansion device is replaced by a third expansion device with a constant working pressure, the working pressure of the third expansion device being less than a preset pressure threshold.

Optionally, the bleed air purification system further comprises a temperature sensor and a second control valve;

the temperature sensor is arranged between the first outlet and an inlet of the compression condensing unit, the temperature sensor and the second control valve are respectively and electrically connected with the controller, and the second control valve is used for controlling the opening and closing of the second outlet;

the controller collects the suction temperature of the compression condensing unit through the temperature sensor, and controls the second control valve to be opened when the suction temperature is lower than a third temperature threshold value so as to control the second outlet to be communicated with the outside and discharge the gas in the cavity through the second outlet; the controller controls the second control valve to close when the suction temperature is greater than or equal to the first temperature threshold value, so as to control the second outlet to be isolated from the outside.

Optionally, the air pumping and purifying system further comprises an exhaust pipeline communicated with the second outlet and an exhaust pump arranged on the pipeline, the second control valve is arranged on the pipeline, and when the second control valve is opened, the exhaust pump exhausts the gas in the cavity.

Optionally, the pumping purification system further comprises a first dry filter, and the first outlet is communicated with the liquid return port through the first dry filter;

the bleed air purification system further comprises a third control valve and/or a fourth control valve, and the third control valve and/or the fourth control valve are electrically connected with the controller;

the third control valve is used for controlling whether the first inlet is communicated with the first exhaust port or not, and the fourth control valve is used for controlling whether the first outlet is communicated with the liquid return port or not.

According to a second aspect of the present invention, there is provided a water chiller, comprising:

a compressor;

a first condenser;

a fourth expansion device;

a second evaporator; and

the utility model discloses the air exhaust purification system of the first aspect;

wherein the compressor, the first condenser, the fourth expansion device and the second evaporator are sequentially communicated to form a refrigerant circuit.

Optionally, the water chilling unit further comprises:

a second dry filter;

the first condenser is in communication with the fourth expansion device via the second desiccant filter.

According to the technical scheme provided by the embodiment of the utility model, the constant pressure is maintained in the conventional (the ambient temperature is less than the first temperature threshold) operation by arranging the first expansion device with adjustable working pressure; when the ambient temperature is higher (the ambient temperature is greater than or equal to the first temperature threshold value), the first expansion device is controlled to enable the pressure of the evaporator of the air extraction and purification system to be correspondingly increased, so that the lower discharge rate of the refrigerant in the air extraction and purification system can be ensured, the air extraction efficiency is ensured, and the mistaken discharge caused by the occurrence of critical heat flux density in the air extraction and purification system can be reduced. Under the working condition of higher ambient temperature, the temperature of a mixture of the refrigerant from the water chilling unit and the non-condensable gas in the evaporator of the air extraction and purification system is reduced through the optimization, the heat exchange temperature difference between the refrigerant from the water chilling unit, the non-condensable gas mixture and the refrigerant from the inner side of the evaporator of the air extraction and purification system outside the coil pipe of the evaporator of the air extraction and purification system is reduced, and the false discharge of the refrigerant is further reduced by avoiding the occurrence of critical heat flux density, so that the reliable operation of the unit is ensured, and the environmental protection is realized.

It is to be understood that both the foregoing general description and the following detailed description are exemplary and explanatory only and are not restrictive of the invention as claimed.

Drawings

The accompanying drawings, which are incorporated in and constitute a part of this specification, illustrate embodiments consistent with the invention and together with the description, serve to explain the principles of the invention.

FIG. 1 is a schematic diagram of a prior art bleed air purification system;

FIG. 2 is a schematic diagram of an extraction purification system according to an exemplary embodiment of the present invention;

FIG. 3 is a schematic diagram of an extraction purification system according to another exemplary embodiment of the present invention;

fig. 4 is a schematic diagram of an extraction purification system according to another exemplary embodiment of the present invention.

Reference numerals:

100: a compressor;

200: a first condenser; 210: a first exhaust port; 220: a liquid return port; 230: a first air inlet; 240: a second exhaust port; 250: a first water inlet; 260: a first water outlet;

300: a fourth expansion device;

400: a second evaporator; 410: a second air inlet; 420: a third exhaust port; 430: a second water inlet; 440: a second water outlet;

500: an air extraction purification system; 1: compressing a condensing unit; 2: a first expansion device; 3: a first evaporator; 31: a coil pipe; 32: a first inlet; 33: a first outlet; 34: a second outlet; 4: an intake air temperature sensor; 5: a second expansion device; 6: a heat exchanger; 7: a first control valve; 8: an exhaust duct; 9: a second control valve; 10: a first dry filter; 20: a third control valve; 30: a fourth control valve; 40: an exhaust pump; 600: and a second dry filter.

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 is to be understood that although the terms first, second, third, etc. may be used herein to describe various information, such information should not be limited to these terms. These terms are only used to distinguish one type of information from another. For example, the first information may also be referred to as second information, and similarly, the second information may also be referred to as first information, without departing from the scope of the present invention. The word "if" as used herein may be interpreted as "at … …" or "when … …" or "in response to a determination", depending on the context.

It should be noted that, in the following examples and embodiments, features may be combined with each other without conflict.

Referring to fig. 1, the conventional air-extracting and purifying system includes a compression condensing unit 1 ', a constant-pressure expansion valve 2 ', an evaporator 3 ', a temperature sensor 4 ' and a dry filter 5 ', wherein the evaporator 3 ' includes a cavity and a coil (not shown) disposed in the cavity, an air outlet of the compression condensing unit 1 ', the dry filter 5 ', the constant-pressure expansion valve 2 ', the coil and an air inlet of the compression condensing unit 1 ' are sequentially communicated, a leakage gas sucked from an outside of a condenser 200 ' of a chiller unit enters the cavity of the evaporator 3 ', a mixed gas of the leakage gas and a refrigerant exchanges heat with the refrigerant inside the evaporator 3 ', the refrigerant condensate flows back to the chiller unit, and air in the leakage gas is collected in the cavity of the evaporator 3 ', and is further discharged from an outlet of the evaporator 3 ' to the air-extracting and purifying system, so as to purify the leakage gas, so that the leaking gas reaches the emission standard. In some application places, especially places with higher environmental temperature or places with higher water intake of the condenser 200 ', the constant pressure expansion valve 2 ' operates at constant pressure, so that the temperature of the refrigerant inlet flowing through the coil pipe is constant, the temperature difference between the inside and the outside of the coil pipe is increased, the critical heat flux density of the air extraction and purification system is easy to appear, and further, the air suction temperature detected by the temperature sensor 4 ' is rapidly reduced, so that the valve of the air extraction and purification system frequently acts, the content of the refrigerant in the discharged gas is larger, and the air extraction and purification system does not meet the discharge requirement.

In contrast, the air extraction and purification system of the utility model maintains constant pressure in normal (the ambient temperature is less than the first temperature threshold) operation by arranging the first expansion device with adjustable working pressure; when the ambient temperature is higher (the ambient temperature is greater than or equal to the first temperature threshold value), the first expansion device is controlled to enable the pressure of the evaporator of the air extraction and purification system to be correspondingly increased, so that the lower discharge rate of the refrigerant in the air extraction and purification system can be ensured, the air extraction efficiency is ensured, and the mistaken discharge caused by the occurrence of critical heat flux density in the air extraction and purification system can be reduced. Under the working condition of higher environmental temperature, the temperature of the mixture of the refrigerant from the water chilling unit and the non-condensable gas outside the evaporator coil of the air extraction and purification system is reduced through the optimization, the heat exchange temperature difference between the refrigerant from the water chilling unit and the non-condensable gas mixture outside the coil of the air extraction and purification system and the refrigerant inside the evaporator of the air extraction and purification system is reduced, and the false discharge of the refrigerant is reduced by avoiding the occurrence of critical heat flux density, so that the reliable operation of the unit is ensured, and the environmental protection is realized.

Specifically, referring to fig. 2, the embodiment of the present invention provides an air-extracting and purifying system for a water chilling unit, the water chilling unit includes a first condenser 200, the first condenser 200 includes a first air outlet 210 and a liquid return port 220, and the first condenser 200 can discharge the leakage air sucked from the outside through the first air outlet 210.

In some embodiments, the first condenser 200 is an air-cooled condenser, and the first exhaust port 210 communicates with an exhaust line of the first condenser 200. In other embodiments, the first condenser 200 is a water-cooled condenser, and the first exhaust port 210 is disposed at the top of the first condenser 200.

Referring again to fig. 2, the bleed air purification system 500 may include a compression-condensation unit 1, a first expansion device 2, a first evaporator 3, an ambient temperature sensor, and a controller.

The first evaporator 3 includes a cavity, a coil 31, a first inlet 32, a first outlet 33, and a second outlet 34, the coil 31 is disposed in the cavity, and the first inlet 32, the first outlet 33, and the second outlet 34 are respectively communicated with the cavity. The air outlet of the compression condensing unit 1, the first expansion device 2, the coil 31 and the air suction port of the compression condensing unit 1 are sequentially communicated, the first inlet 32 is communicated with the first exhaust port 210 of the first condenser 200, and the first outlet 33 is communicated with the liquid return port 220 of the first condenser 200. The second outlet 34 can be used to discharge the gas inside the cavity, specifically, when the second outlet 34 is opened to communicate with the outside, the gas inside the cavity is discharged to the outside through the second outlet 34; when the second outlet 34 is closed from the outside, the gas in the cavity cannot be discharged from the second outlet 34. It should be noted that, in the embodiment of the present invention, the sequential connection only illustrates the sequential relationship between the respective devices, and other devices, such as a stop valve, may be further included between the respective devices.

In this embodiment, the ambient temperature sensor is used for detecting the ambient temperature around the chiller and sending the detected ambient temperature to the controller.

The controller collects the ambient temperature through an ambient temperature sensor and controls the first expansion device 2 to be in a first operation state when the ambient temperature is less than a first temperature threshold; controlling the first expansion device 2 in the second operating state when the ambient temperature is greater than or equal to the first temperature threshold; wherein the working pressure of the first expansion device 2 in the first operating state is lower than the working pressure of the first expansion device 2 in the second operating state. It should be noted that the implementation process of the controller controlling the first expansion device 2 to be in the first operation state or the second operation state is the prior art, and the embodiment of the present invention is not specifically described here.

In the present embodiment, in the first operating state, the first expansion device 2 is operated at a fixed pressure that is less than the preset pressure threshold value, so that the first expansion device 2 maintains a constant evaporation pressure; under the second running state, the working pressure of the first expansion device 2 is greater than or equal to the preset pressure threshold, and the evaporation pressure of the first expansion device 2 is correspondingly increased, so that the temperature difference (namely the difference between the temperature of the refrigerant in the coil 31 and the temperature inside the cavity) when the refrigerant in the coil 31 boils is reduced, the false discharge is reduced by avoiding the occurrence of critical heat flux density, and the reliable running of the water chilling unit is finally ensured and the environmental protection is realized. When the first condenser 200 is an air-cooled condenser, the air-extracting purification system 500 only needs to acquire the ambient temperature around the chiller through the ambient temperature sensor.

When the first condenser 200 is a water-cooled condenser, the air-extracting and purifying system 500 not only needs to acquire the ambient temperature around the water chilling unit through an ambient temperature sensor, but also includes a water inlet temperature sensor electrically connected with the controller, the water inlet temperature sensor is used for detecting the water inlet temperature of the first condenser 200, and the controller controls the first expansion device 2 to be in a first operation state when the ambient temperature is less than a first temperature threshold and the water inlet temperature is less than a second temperature threshold; the controller controls the first expansion device 2 to be in the second operation state when the ambient temperature sensor is greater than or equal to the first temperature threshold or when the temperature of the incoming water is greater than or equal to the second temperature threshold. By the design, the lower discharge rate of the refrigerant in the air extraction and purification system 500 can be ensured, and the mistaken discharge caused by the critical heat flux density in the air extraction and purification system 500 can be reduced.

It should be understood that the first temperature threshold and the second temperature threshold may be set according to the requirement.

In some embodiments, referring to FIG. 3, the bleed air purification system 500 further comprises a second expansion device 5, the second expansion device 5 being electrically connected to the controller. When the first condenser 200 is an air-cooled condenser, the controller controls the opening degree of the second expansion device 5 to be a preset opening degree size (that is, the second expansion device 5 operates at a preset opening degree) when the ambient temperature is less than the first temperature threshold, and controls the opening degree of the second expansion device 5 to be less than the preset opening degree size when the ambient temperature is greater than or equal to the first temperature threshold. When the first condenser 200 is a water-cooled condenser, the controller controls the opening degree of the second expansion device 5 to be a preset opening degree when the ambient temperature is less than the first temperature threshold and the inlet water temperature is less than the second temperature threshold, and when the ambient temperature is greater than or equal to the first temperature threshold or the inlet water temperature is greater than or equal to the second temperature threshold, the controller controls the opening degree of the second expansion device 5 to be less than the preset opening degree.

Wherein, when the ambient temperature is greater than or equal to the aperture of controller control second expansion device 5 for being less than predetermineeing the aperture size to suitably reduce second expansion device 5's aperture, with the temperature that reduces the refrigerant that gets into air bleed clean system 500's refrigerating unit, and then reduce the difference in temperature when the refrigerant in coil pipe 31 boils, through avoiding the emergence of critical heat flux density and then reduce the spurious emission, finally guarantee the cooling water set reliable operation and realize environmental protection.

It should be noted that the implementation process of the controller controlling the opening degree of the second expansion device 5 is the prior art, and the embodiment of the present invention does not specifically describe this.

In the above-described embodiment with the second expansion means 5, two cases can be distinguished:

(1) maintaining the first expansion device 2 as a variable working pressure expansion device, the expansion device operating at a fixed pressure less than a preset pressure threshold in a first operating state; in a second operating state, the working pressure of the expansion device is greater than or equal to a preset pressure threshold. The first expansion device 2 and the second expansion device 5 can be controlled simultaneously, and one of the first expansion device 2 and the second expansion device 5 can be controlled, so that the lower discharge rate of the refrigerant in the air extraction and purification system 500 is ensured, and meanwhile, the mistaken discharge caused by the critical heat flux density in the air extraction and purification system 500 is reduced.

(2) The first expansion device 2 is replaced by a third expansion device with a constant working pressure, the working pressure of the third expansion device being less than a preset pressure threshold, the third expansion device being operated at a fixed pressure less than the preset pressure threshold, such that the third expansion device maintains a constant evaporation pressure. The present embodiment can only control the second expansion device 5, so as to reduce the false discharge caused by the critical heat flux density occurring in the pumping purification system 500 while ensuring the low discharge rate of the refrigerant in the pumping purification system 500. It should be noted that, the implementation process of the controller controlling the third expansion device to operate at a fixed pressure less than the preset pressure threshold is prior art, and the embodiment of the present invention does not specifically describe this.

In some other embodiments, the water chilling unit further includes a cooling liquid circulation flow path, the type of the cooling liquid circulation flow path of the present invention can be selected according to the need, for example, the cooling liquid can be water, oil, etc. which can perform heat exchange, or a mixed liquid of water and glycol, or other mixed liquids which can perform heat exchange.

Referring to fig. 4, the bleed air purification system 500 may further include a heat exchanger 6 and a first control valve 7, the first inlet 32 is communicated with the outlet of the first condenser 200 via the heat exchanger 6, and the first control valve 7 is used for controlling whether the heat exchanger 6 is communicated with the cooling liquid circulation flow path.

When the first condenser 200 is an air-cooled condenser and the ambient temperature is lower than the first temperature threshold value, the controller controls the first control valve 7 to be in a closed state, so that the heat exchanger 6 and the cooling liquid circulation flow path are cut off; when the ambient temperature is greater than or equal to the first temperature threshold value, the controller controls the first control valve 7 to be in an open state, so that the heat exchanger 6 is communicated with the cooling liquid circulation flow path, and the heat exchanger 6 is used for cooling the gas discharged from the outlet of the first condenser 200.

When the first condenser 200 is a water-cooled condenser, when the ambient temperature is lower than a first temperature threshold and the water inlet temperature is lower than a second temperature threshold, the controller controls the first control valve 7 to be in a closed state, so that the heat exchanger 6 and the cooling liquid circulation flow path are cut off; when the ambient temperature is greater than or equal to the first temperature threshold or the inlet water temperature is greater than or equal to the second temperature threshold, the controller controls the first control valve 7 to be in an open state, so that the heat exchanger 6 is communicated with the cooling liquid circulation flow path, and the heat exchanger 6 is used for cooling the gas discharged from the outlet of the first condenser 200.

Optionally, the cooling liquid circulation flow path is a chilled water circulation flow path of the water chilling unit, that is, chilled water of the chilled water circulation flow path precools gas at an outlet of a condenser of the refrigeration unit before entering an evaporator of the air extraction purification system 500, so as to reduce the temperature of a refrigerant entering the refrigeration unit of the air extraction purification system 500, reduce a temperature difference when the refrigerant in the coil 31 boils, reduce false discharge by avoiding occurrence of critical heat flux density, and finally ensure reliable operation of the unit and realize environmental protection. The heat exchanger 6 can be a coil heat exchanger, and can also be other types of heat exchangers. Optionally, the heat exchanger 6 is a coil heat exchanger, and the material of the coil heat exchanger is copper.

In the above-described embodiment with the heat exchanger 6 and the first control valve 7, two cases can be distinguished:

(1) maintaining the first expansion device 2 as a variable working pressure expansion device, the expansion device operating at a fixed pressure less than a preset pressure threshold in a first operating state; in a second operating state, the working pressure of the expansion device is greater than or equal to a preset pressure threshold. The first expansion device 2 and the first control valve 7 can be controlled simultaneously, and one of the first expansion device 2 and the first expansion valve can be controlled, so that the lower discharge rate of the refrigerant in the air-extracting and purifying system 500 is ensured, and meanwhile, the mistaken discharge caused by the critical heat flux density in the air-extracting and purifying system 500 is reduced.

(2) The first expansion device 2 is replaced by a third expansion device with a constant working pressure, the working pressure of the third expansion device being less than a preset pressure threshold, the third expansion device being operated at a fixed pressure less than the preset pressure threshold, such that the third expansion device maintains a constant evaporation pressure. In the present embodiment, the first control valve 7 can be controlled only to ensure a low discharge rate of the refrigerant in the pumping and purifying system 500 and reduce the erroneous discharge caused by the critical heat flux density in the pumping and purifying system 500.

It will be appreciated that the above described embodiment with the second expansion means 5 and the above described embodiment with the heat exchanger 6 and the first control valve 7 may be combined.

Referring to fig. 2 to 4, the bleed air purification system 500 of the present embodiment may further include an intake temperature sensor 4 and a second control valve 9, wherein the intake temperature sensor 4 is disposed between the first outlet 33 and the inlet of the compression condensing unit 1, and the second control valve 9 is used for controlling the opening and closing of the second outlet 34. In this embodiment, the air suction temperature sensor 4 and the second control valve 9 are electrically connected to the controller, and the air suction temperature sensor 4 is used for detecting the air suction temperature of the compression condensing unit 1 and sending the air suction temperature to the controller.

The controller collects the suction temperature of the compression condensing unit 1 through the temperature sensor 4, and when the suction temperature is lower than a third temperature threshold value, the controller controls the second control valve 9 to be opened, and simultaneously the exhaust pump 40 is opened, at the moment, the second outlet 34 is opened, the second outlet 34 is communicated with the outside, and the gas in the cavity can be exhausted through the second outlet 34; when the suction temperature is greater than or equal to the first temperature threshold value, the controller controls the second control valve 9 to close, at this time, the second outlet 34 is closed, the second outlet 34 is isolated from the outside, and the gas in the cavity cannot be exhausted through the second outlet 34. The suction temperature is lower than the third temperature threshold, which indicates that the content of the refrigerant in the cavity is low and meets the discharge standard; the suction temperature is greater than or equal to the third temperature threshold, which indicates that the content of the refrigerant in the cavity is large and does not meet the discharge standard.

Further, referring to fig. 2 to 4 again, the bleed air purification system 500 may further include an exhaust pipe 8 communicating with the second outlet 34, and an exhaust pump 40 disposed on the exhaust pipe 8, wherein the second control valve 9 is disposed on the pipe 8. In the present embodiment, when the second control valve 9 is opened, the exhaust pump 40 is simultaneously opened, and the gas in the chamber is exhausted by the exhaust pump 40. The third temperature threshold may be a suction temperature threshold corresponding to a critical value of the refrigerant content in the discharge gas required by the discharge standard, or may be smaller than the suction temperature threshold, and optionally, the third temperature threshold is-17 degrees celsius, it should be understood that the size of the third temperature threshold may be set as required.

Referring to fig. 2 to 4 again, the pumping purification system 500 may further include a first dry filter 10, the first outlet 33 is communicated with the liquid return port 220 through the first dry filter 10, and moisture and impurities in the gas entering the liquid return port 220 are filtered by the first dry filter 10.

Referring again to fig. 2-4, the bleed air purge system 500 can further include a third control valve 20 and/or a fourth control valve 30, wherein the third control valve 20 and/or the fourth control valve 30 are electrically connected to the controller. The third control valve 20 is used to control whether the first inlet 32 is communicated with the first exhaust port 210, and the fourth control valve 30 is used to control whether the first outlet 33 is communicated with the liquid return port 220. In this embodiment, when the leakage gas sucked from the outside by the first evaporator 3 needs to be discharged through the purge system 500, both the third control valve 20 and the fourth control valve 30 are opened; when it is not necessary to discharge the leak gas sucked from the outside by the first evaporator 3 through the purge system 500, both the third control valve 20 and the fourth control valve 30 are closed. It is understood that the third control valve 20 and the fourth control valve 30 may not be provided, and the leakage gas sucked from the outside by the first evaporator 3 may be discharged all the time through the pumping purification system 500.

The first control valve 7, the second control valve 9, the third control valve 20, the fourth control valve 30, and the fifth control valve 60 may be solenoid valves, or may be electronic valves of other types.

It should be noted that, the implementation process of the controller controlling the opening and closing of the first control valve 7, the second control valve 9, the third control valve 20, and the fourth control valve 30 is the prior art, and the embodiment of the present invention does not specifically describe this.

Referring to fig. 2 to 4 again, the embodiment of the present invention further provides a water chiller, which may include a compressor 100, a first condenser 200, a fourth expansion device 300, a second evaporator 400, and the air-extracting purification system 500. The compressor 100, the first condenser 200, the fourth expansion device 300, and the second evaporator 400 are sequentially communicated to form a refrigerant circuit, and specifically, the outlet of the compressor 100, the first air inlet 230 of the first condenser 200, the heat exchanging part of the first condenser 200, the second air outlet 240 of the second condenser, the fourth expansion device 300, the second air inlet 410 of the second evaporator 400, the heat exchanging part of the second evaporator 400, the third air outlet 420 of the second evaporator 400, and the air inlet of the compressor 100 are sequentially communicated.

The first condenser 200 may be a water-cooled heat exchanger or an air-cooled heat exchanger. When the first condenser 200 is a water-cooled heat exchanger, the first condenser 200 further includes a first water inlet 250 and a first water outlet 260, wherein the first water inlet 250 is used for obtaining cooling water from the outside, and the first water outlet 260 is used for discharging the cooling water after heat exchange by the first condenser 200.

The second evaporator 400 may be a water-cooled heat exchanger, or may be another type of heat exchanger. When the second evaporator 400 is a water-cooled heat exchanger, the second evaporator 400 further includes a second water inlet 430 and a second water outlet 440, wherein the second water inlet 430 is used for obtaining the chilled water from the outside, and the second water outlet 440 is used for discharging the chilled water after heat exchange by the second condenser. Alternatively, the inlet of the chilled water circulation flow path is communicated with the second inlet 430 of the second evaporator 400, and the outlet of the chilled water circulation flow path is communicated with the second outlet 440 of the second evaporator 400.

In addition, referring to fig. 2 to 4 again, the water chilling unit may further include a second dry filter 600, and the first condenser 200 is in communication with the fourth expansion device 300 through the second dry filter 600. Moisture and other impurities in the refrigerant flowing into the fourth expansion device 300 are filtered by the second dry filter 600.

It should be noted that, in the embodiment of the present invention, the first expansion device 2, the second expansion device 5, the third expansion device, and the fourth expansion device 300 can perform the functions of reducing the temperature and the pressure.

The above description is only a preferred embodiment of the present invention, and should not be taken as limiting the invention, and any modifications, equivalent replacements, improvements, etc. made within the spirit and principle of the present invention should be included in the protection scope of the present invention.

Claims (10)

1. An air extraction and purification system of a water chilling unit, wherein the water chilling unit comprises a first condenser (200), and is characterized in that the air extraction and purification system comprises a compression and condensation unit (1), a first expansion device (2), a first evaporator (3), an ambient temperature sensor and a controller, wherein the first evaporator (3) comprises a cavity, a coil pipe (31) arranged in the cavity, and a first inlet (32), a first outlet (33) and a second outlet (34) which are communicated with the cavity;

the air outlet of the compression condensing unit (1), the first expansion device (2), the coil (31) and the air suction port of the compression condensing unit (1) are sequentially communicated, the first inlet (32) is communicated with the first exhaust port (210) of the first condenser (200), the first outlet (33) is communicated with the liquid return port (220) of the first condenser (200), and the second outlet (34) can be used for discharging the gas in the cavity;

the ambient temperature sensor is electrically connected with the controller, the controller collects ambient temperature through the ambient temperature sensor, and the controller controls the first expansion device (2) to be in a first operation state when the ambient temperature is smaller than a first temperature threshold value; the controller controls the first expansion device (2) in a second operating state when the ambient temperature sensor is greater than or equal to the first temperature threshold;

wherein the working pressure of the first expansion device (2) in the first operating state is lower than the working pressure of the first expansion device (2) in the second operating state.

2. The extraction purification system according to claim 1, wherein the first condenser (200) is a water-cooled condenser, the extraction purification system further comprising an inlet water temperature sensor electrically connected to the controller;

the controller collects the inlet water temperature of the first condenser (200) through the inlet water temperature sensor, and controls the first expansion device (2) to be in a first operation state when the ambient temperature is smaller than a first temperature threshold and the inlet water temperature is smaller than a second temperature threshold; the controller controls the first expansion device (2) to be in a second operating state when the ambient temperature sensor is greater than or equal to the first temperature threshold, or when the incoming water temperature is greater than or equal to the second temperature threshold.

3. The extraction purification system according to claim 1, further comprising a second expansion device (5), the second expansion device (5) being electrically connected to the controller;

when the ambient temperature is lower than the first temperature threshold value, the controller controls the opening degree of the second expansion device (5) to be a preset opening degree; and when the ambient temperature is greater than or equal to the first temperature threshold value, the controller controls the opening degree of the second expansion device (5) to be smaller than the preset opening degree.

4. The extraction purification system of claim 1, wherein the chiller further comprises a coolant circulation flow path;

the extraction purification system also comprises a heat exchanger (6) and a first control valve (7), the first inlet (32) is communicated with the outlet of the first condenser (200) through the heat exchanger (6), and the first control valve (7) is used for controlling whether the heat exchanger (6) is communicated with the cooling liquid circulation flow path or not;

the controller controls the first control valve (7) to be in a closed state when the ambient temperature is less than the first temperature threshold value, so that the heat exchanger (6) is cut off from the cooling liquid circulation flow path; and when the ambient temperature is greater than or equal to the first temperature threshold value, the controller controls the first control valve (7) to be in an open state, so that the heat exchanger (6) is communicated with the cooling liquid circulation flow path, and the heat exchanger (6) is used for cooling the gas discharged from the outlet of the first condenser (200).

5. The extraction air purification system according to claim 4, characterized in that the heat exchanger (6) is a coil heat exchanger.

6. The extraction purification system according to claim 3 or 4, characterized in that the first expansion device (2) is replaced by a third expansion device with a constant working pressure, the working pressure of the third expansion device being lower than a preset pressure threshold.

7. The extraction purification system according to claim 1, characterized in that it further comprises a suction temperature sensor (4) and a second control valve (9);

the air suction temperature sensor (4) is arranged between the first outlet (33) and an inlet of the compression condensing unit (1), the air suction temperature sensor (4) and the second control valve (9) are respectively electrically connected with the controller, and the second control valve (9) is used for controlling the opening and closing of the second outlet (34);

the controller collects the suction temperature of the compression condensing unit (1) through the temperature sensor (4), and when the suction temperature is smaller than a third temperature threshold value, the controller controls the second control valve (9) to be opened so as to control the second outlet (34) to be communicated with the outside and discharge the gas in the cavity through the second outlet (34); the controller controls the second control valve (9) to close to control the second outlet (34) to be isolated from the outside when the suction temperature is greater than or equal to the first temperature threshold.

8. The extraction purification system according to claim 7, further comprising an exhaust pipe (8) communicating with the second outlet (34) and an exhaust pump (40) provided on the pipe (8), wherein the second control valve (9) is provided on the pipe (8), and when the second control valve (9) is opened, the exhaust pump (40) exhausts the gas in the cavity.

9. The extraction purification system according to claim 1, further comprising a first dry filter (10), wherein the first outlet (33) is in communication with the liquid return port (220) via the first dry filter (10);

the bleed air purification system further comprises a third control valve (20) and/or a fourth control valve (30), the third control valve (20) and/or the fourth control valve (30) being electrically connected with the controller;

the third control valve (20) is used for controlling whether the first inlet (32) is communicated with the first exhaust port (210), and the fourth control valve (30) is used for controlling whether the first outlet (33) is communicated with the liquid return port (220).

10. A chiller, the chiller comprising:

a compressor (100);

a first condenser (200);

a fourth expansion device (300);

a second evaporator (400); and

the extraction purification system (500) according to any of claims 1 to 8;

wherein the compressor (100), the first condenser (200), the fourth expansion device (300) and the second evaporator (400) are sequentially communicated to form a refrigerant circuit.

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