Air conditioner unit with the function of cleaning non-condensable gases

Abstract

The present invention provides an air-conditioning unit with the function of cleaning non-condensable gases. The air-conditioning unit includes an evaporator, a condenser and a cleaning structure. An inlet, an exhaust port and a liquid return port are provided on the cleaning structure. A gaseous outlet is provided on the condenser. The gaseous outlet is connected to the inlet. The liquid return port is connected to the evaporator. The exhaust port is connected to the outside. And the mixed gas in the condenser is separated in the cleaning structure to form a liquid refrigerant and a gaseous non-condensable gas. The air-conditioning unit with the function of cleaning non-condensable gases provided by the present invention separates the non-condensable gas and the refrigerant according to different liquefaction conditions by using the cleaning structure, returns the liquefied refrigerant to the unit, discharges the gaseous non-condensable gas out of the unit, and then cooperates with the on-off control of the gas intake valve, the exhaust valve and the liquid return valve to achieve the purpose of cleaning the non-condensable gas in the system, effectively improving the reliability and performance of the unit and ensuring the reliable operation of the unit.

Description

Technical Field

[0001] The present invention relates to the technical field of refrigerant heat exchange devices, in particular to an air conditioner unit with the function of cleaning non-condensable gases. Background Art

[0002] In the centrifugal water-cooled chiller system with a negative-pressure working medium, due to the physical properties of the negative-pressure working medium, during the operation of the unit, the evaporator is in a negative-pressure state. Due to defects in unit manufacturing, technology, etc., external air will inevitably leak into the evaporator, resulting in air being mixed into the refrigerant, causing the performance of the unit to decline. The air entering the refrigerant system is compressed by the compressor and enters the condenser. However, in the condenser, the gaseous refrigerant exchanges heat with the cooling water and condenses into a liquid refrigerant, while the air mixed into the system cannot condense under the pressure of the condenser and the temperature of the cooling water, becoming non-condensable gases in the system. After the unit operates for a long time, more and more non-condensable gases will accumulate in the upper part of the condenser and cannot be discharged from the system, resulting in a gradual increase in the condensation pressure of the unit, seriously affecting the reliability and performance of the unit. Summary of the Invention

[0003] In order to solve the technical problem in the prior art that the performance of the unit is affected because non-condensable gases do not participate in heat exchange, an air conditioner unit with the function of cleaning non-condensable gases that separates non-condensable gases and refrigerants according to different liquefaction conditions is provided.

[0004] An air conditioner unit includes an evaporator, a condenser, and a cleaning structure. The cleaning structure is provided with an inlet, an exhaust port, and a liquid return port. The condenser is provided with a gaseous outlet, and the gaseous outlet is connected to the inlet. The liquid return port is connected to the evaporator, and the exhaust port is connected to the outside. The mixed gas in the condenser is separated in the cleaning structure to form a liquid refrigerant and gaseous non-condensable gases. The liquid refrigerant enters the evaporator through the liquid return port, and the gaseous non-condensable gases are discharged from the cleaning structure through the exhaust port.

[0005] A gas extraction valve is provided at the inlet, an exhaust valve is provided at the exhaust port, and a liquid return valve is provided at the liquid return port. When the gas extraction valve is opened, the condenser is connected to the cleaning structure. When the exhaust valve is opened, the cleaning structure is connected to the outside. When the liquid return valve is opened, the cleaning structure is connected to the evaporator.

[0006] A partition and heat exchange tubes are provided in the evaporator. The partition divides the evaporator into a relatively sealed condensation chamber and an evaporation chamber. The condensation chamber forms the cleaning structure, and part of the heat exchange tubes are arranged in the evaporation chamber, and the remaining part of the heat exchange tubes are arranged in the condensation chamber.

[0007] The shape of the partition is the same as the cross-sectional shape of the evaporator, and the edge of the partition is sealingly arranged with the inner surface of the evaporator.

[0008] Through holes are provided on the partition, the heat exchange tubes are arranged in the through holes, and the heat exchange tubes are sealingly arranged with the through holes.

[0009] The cleaning structure includes a cleaning tank and a pressurizing mechanism. The inlet, the exhaust port and the liquid return port are all arranged on the cleaning tank. The pressurizing mechanism is arranged between the inlet and the gas outlet, and pressurizes the mixed gas flowing from the gas outlet into the cleaning tank.

[0010] The pressurizing mechanism is a high-pressure pump.

[0011] The gas outlet is arranged above the liquid level in the condenser.

[0012] A liquid collecting bag is arranged at the liquid return port.

[0013] The air-conditioning unit further includes a pressure sensor. The pressure sensor detects the condensation pressure of the air-conditioning unit, and the pressure sensor is electrically connected to the cleaning structure.

[0014] The air-conditioning unit is a negative pressure centrifugal chiller.

[0015] The air-conditioning unit with the function of cleaning non-condensable gas provided by the present invention separates non-condensable gas and refrigerant according to different liquefaction conditions by using the cleaning structure, returns the liquefied refrigerant to the unit, and discharges the gaseous non-condensable gas out of the unit. Then, with the on-off control of the gas intake valve, the exhaust valve and the liquid return valve, the purpose of cleaning the non-condensable gas in the system is achieved, effectively improving the reliability and performance of the unit and ensuring the reliable operation of the unit. Description of the Drawings

[0016] Figure 1 It is a schematic structural diagram of the air-conditioning unit of the embodiment of the air-conditioning unit with the function of cleaning non-condensable gas provided by the present invention;

[0017] Figure 2 It is another schematic structural diagram of the air-conditioning unit of the embodiment of the air-conditioning unit with the function of cleaning non-condensable gas provided by the present invention;

[0018] In the figure:

[0019] 1. Evaporator; 2. Condenser; 3. Cleaning structure; 31. Inlet; 32. Exhaust port; 33. Liquid return port; 21. Gas outlet; 11. Partition; 12. Heat exchange tube; 13. Condensation chamber; 14. Evaporation chamber; 34. Cleaning tank; 35. Pressurizing mechanism. Detailed Embodiments

[0020] In order to make the objectives, technical solutions and advantages of the present invention more clear and understandable, the present invention will be further described in detail below with reference to the accompanying drawings and embodiments. It should be understood that the specific embodiments described herein are only used to explain the present invention and are not used to limit the present invention.

[0021] In a centrifugal water-cooled chiller system with a negative-pressure working medium, due to the physical properties of the negative-pressure working medium, during the operation of the chiller, the pressure value Pe of the evaporator in the compressor is less than the atmospheric pressure Po which is less than the pressure value Pc of the condenser. That is to say, during operation, air will enter the evaporator due to reasons such as manufacturing and process defects, and finally gather above the condenser together with the gaseous working medium after being compressed by the compressor, resulting in an increase in the condensation pressure of the chiller, affecting the reliability and performance of the chiller.

[0022] To solve the above problems, as Figure 1 shown in the air conditioner unit, it includes an evaporator 1, a condenser 2 and a cleaning structure 3. The cleaning structure 3 is provided with an inlet 31, an exhaust port 32 and a liquid return port 33. The condenser 2 is provided with a gaseous outlet 21. The gaseous outlet 21 is connected to the inlet 31. The liquid return port 33 is connected to the evaporator 1. The exhaust port 32 is connected to the outside. And the mixed gas in the condenser 2 is separated in the cleaning structure 3 to form a liquid refrigerant and a gaseous non-condensable gas. The liquid refrigerant enters the evaporator 1 through the liquid return port 33, and the gaseous non-condensable gas is discharged from the cleaning structure 3 through the exhaust port 32. The cleaning structure 3 is used to separate the mixture of the refrigerant and the non-condensable gas according to different liquefaction conditions, achieving the purpose of cleaning the non-condensable gas in the system, effectively improving the reliability and performance of the chiller, and ensuring the reliable operation of the chiller.

[0023] The volume of the cleaning structure 3 is proportional to the volume of the chiller unit.

[0024] A gas intake valve is provided at the inlet 31, an exhaust valve is provided at the exhaust port 32, and a liquid return valve is provided at the liquid return port 33. When the gas intake valve is opened, the condenser 2 is connected to the cleaning structure 3. When the exhaust valve is opened, the cleaning structure 3 is connected to the outside. When the liquid return valve is opened, the cleaning structure 3 is connected to the evaporator 1. Through the on-off control of the gas intake valve, the exhaust valve and the liquid return valve, the functions of allowing the mixed gas to enter the cleaning structure 3, discharging the non-condensable gas, and recovering the refrigerant are realized.

[0025] A partition 11 and heat exchange tubes 12 are provided inside the evaporator 1. The partition 11 divides the evaporator 1 into a relatively sealed condensation chamber 13 and an evaporation chamber 14. The condensation chamber 13 forms the cleaning structure 3. Part of the heat exchange tubes 12 are arranged in the evaporation chamber 14, and the remaining part of the heat exchange tubes 12 are arranged in the condensation chamber 13. Chilled water entering the heat exchange tubes 12 is used to exchange heat with the mixed gas. The refrigerant is liquefied by using the different liquefaction temperatures of the non-condensable gas and the refrigerant, and the non-condensable gas is discharged from the system. The condensed liquid working medium is recycled into the refrigeration system, so as to achieve the purpose of cleaning the non-condensable gas in the system, improve the reliability and performance of the unit, and the liquid refrigerant in the unit normally evaporates in the evaporation chamber 14.

[0026] The shape of the partition 11 is the same as the cross-sectional shape of the evaporator 1, and the edge of the partition 11 is hermetically arranged with the inner surface of the evaporator 1. That is, the partition 11 and one end of the evaporator 1 jointly enclose the cleaning structure 3, reducing the complexity of the internal structure of the evaporator 1.

[0027] Through holes are provided on the partition 11, and the heat exchange tubes 12 are arranged in the through holes, and the heat exchange tubes 12 are hermetically arranged with the through holes. That is, the condensation chamber 13 and the evaporation chamber 14 are distributed along the axis of the heat exchange tubes 12. There is no need to change the arrangement of the heat exchange tubes 12 in the existing evaporator 1, and only the partition 11 needs to be added inside.

[0028] As Figure 2 shown, the cleaning structure 3 includes a cleaning tank 34 and a pressurizing mechanism 35. The inlet 31, the exhaust port 32 and the liquid return port 33 are all arranged on the cleaning tank 34. The pressurizing mechanism 35 is arranged between the inlet 31 and the gaseous outlet 21, and pressurizes the mixed gas flowing from the gaseous outlet 21 into the cleaning tank 34. By pressurizing the mixed gas, the refrigerant in the mixed gas is liquefied while the non-condensable gas is not liquefied, so as to achieve the purpose of separation.

[0029] The pressurizing mechanism 35 is a high-pressure pump.

[0030] The gaseous outlet 21 is arranged above the liquid level in the condenser 2. Preferably, the gaseous outlet 21 is at the highest point of the condenser 2, so as to ensure that more non-condensable gases are discharged into the cleaning structure 3 for separation.

[0031] A liquid collecting package is arranged at the liquid return port 33 to ensure effective recovery of the liquid working medium.

[0032] The air conditioning unit further includes a pressure sensor that detects the condensation pressure of the air conditioning unit, and the pressure sensor is electrically connected to the cleaning structure 3. By comparing the real-time condensation pressure of the air conditioning unit with the rated condensation pressure of the air conditioning unit, the working state of the cleaning structure 3 is controlled. When the real-time condensation pressure is greater than the rated condensation pressure, the cleaning structure 3 starts to work until the real-time condensation pressure drops to a reasonable range (the optimal state is when it is equal to the rated condensation pressure), and the cleaning structure 3 stops working.

[0033] The air conditioning unit is a negative pressure centrifugal water chiller.

[0034] The above embodiments only represent several implementation manners of the present invention, and the description thereof is relatively specific and detailed. However, it should not be construed as a limitation on the scope of the patent of the present invention. It should be noted that for those of ordinary skill in the art, without departing from the concept of the present invention, several modifications and improvements can still be made, and these all belong to the protection scope of the present invention. Therefore, the protection scope of the patent of the present invention shall be subject to the appended claims.

Claims

1. An air conditioning unit, characterized in that The invention comprises an evaporator (1), a condenser (2) and a cleaning structure (3), wherein the cleaning structure (3) is provided with an inlet (31), an exhaust port (32) and a liquid return port (33), the condenser (2) is provided with a gaseous outlet (21), the gaseous outlet (21) is communicated with the inlet (31), the liquid return port (33) is communicated with the evaporator (1), the exhaust port (32) is communicated with the outside, and the mixed gas in the condenser (2) is separated in the cleaning structure (3) to form a liquid refrigerant and a gaseous non-condensable gas, the liquid refrigerant enters the evaporator (1) through the liquid return port (33), and the gaseous non-condensable gas enters the evaporator (1) through the liquid return port (33). The body is discharged from the cleaning structure (3) through the exhaust port (32); a partition (11) and a heat exchange tube (12) are provided in the evaporator (1); the partition (11) separates the evaporator (1) into a relatively sealed condensation chamber (13) and an evaporation chamber (14); the condensation chamber (13) forms the cleaning structure (3), and part of the heat exchange tube (12) is arranged in the evaporation chamber (14), and the remaining part of the heat exchange tube (12) is arranged in the condensation chamber (13); a through hole is provided on the partition (11), the heat exchange tube (12) is arranged through the through hole, and the heat exchange tube (12) is sealed with the through hole.

2. The air conditioning unit according to claim 1, characterized in that: An air intake valve is provided at the inlet (31), an exhaust valve is provided at the exhaust port (32), and a liquid return valve is provided at the liquid return port (33). When the air intake valve is opened, the condenser (2) is connected to the cleaning structure (3); when the exhaust valve is opened, the cleaning structure (3) is connected to the outside world; and when the liquid return valve is opened, the cleaning structure (3) is connected to the evaporator (1).

3. The air conditioning unit according to claim 1, characterized in that: The shape of the partition (11) is the same as the cross-sectional shape of the evaporator (1), and the edge of the partition (11) is sealed to the inner surface of the evaporator (1); the gaseous outlet (21) is arranged above the liquid level in the condenser (2).

4. The air conditioning unit according to claim 1, characterized in that: The cleaning structure (3) comprises a cleaning tank (34) and a pressurizing mechanism (35); the inlet (31), the exhaust port (32) and the liquid return port (33) are all arranged on the cleaning tank (34); the pressurizing mechanism (35) is arranged between the inlet (31) and the gaseous outlet (21) and pressurizes the mixed gas flowing from the gaseous outlet (21) into the cleaning tank (34).

5. The air conditioning unit according to claim 4, characterized in that: The pressurizing mechanism (35) is a high-pressure pump.

6. The air conditioning unit according to claim 1, characterized in that: A liquid collection bag is provided at the liquid return port (33).

7. The air conditioning unit according to claim 1, characterized in that: The air conditioning unit further comprises a pressure sensor, which detects the condensing pressure of the air conditioning unit, and the pressure sensor is electrically connected to the cleaning structure (3).

8. The air conditioning unit according to claim 1, characterized in that: The air conditioning unit is a negative pressure centrifugal chiller.

Images