Evaporator and air conditioning unit

Abstract

The present application provides an evaporator and an air conditioning unit. The evaporator includes a main shell, a cavity is formed in the main shell, and an evaporation element is arranged in the cavity. A gas-liquid filter is arranged in the cavity to separate the cavity into an evaporation space and a gaseous refrigerant space, and the evaporation element is located in the evaporation space. A cooling system return air pipe is arranged on the main shell to connect the evaporation space and a cooling return line. An exhaust port is arranged on the main shell and is connected to the gaseous refrigerant space. By applying the technical solution of the present invention, the liquid refrigerant can be filtered out under the action of the gas-liquid filter, and only the gaseous refrigerant is supplied to the suction end of the compressor through the exhaust port connected to the gaseous refrigerant space, thereby preventing the abnormal suction of liquid caused by the compressor sucking in the liquid refrigerant that has not been completely evaporated, and avoiding the reduction of unit performance and reliability and shortening of service life caused by the suction of liquid.

Description

Technical Field

[0001] The present invention relates to the technical field of refrigeration equipment, and in particular to an evaporator and an air-conditioning unit. Background Art

[0002] In refrigeration equipment, the compressor motor often generates a certain amount of heat during operation, and it needs to be cooled. For refrigeration equipment that uses the refrigerant of the unit's own refrigeration cycle to cool the motor, the refrigerant after cooling the motor is usually in a gas-liquid mixed state. When the gas-liquid mixed refrigerant returns to the evaporator, it will be sucked into the compressor, causing the phenomenon of suction with liquid.

[0003] The compressor's suction air carries liquid, which will cause the refrigerant to be sucked into the compressor before it completely evaporates and exchanges heat in the evaporator. This not only reduces the system's cooling capacity, but also increases the power consumption of compression, affecting the performance of the unit. In addition, due to the high-speed suction of liquid droplets into the compressor, the compressor's key component, the impeller, is at risk of being punctured, reducing the unit's safety and operational reliability. Summary of the invention

[0004] The embodiment of the present invention provides an evaporator and an air conditioning unit to solve the technical problem of liquid inhalation caused by the gas-liquid mixed refrigerant after cooling the motor passing through the evaporator and then being sucked into the compressor in the air conditioning unit in the prior art.

[0005] An embodiment of the present application provides an evaporator, comprising: a main shell, a cavity is formed in the main shell; an evaporating element is arranged in the cavity; the evaporator also includes: a gas-liquid filter, which is arranged in the cavity to separate the cavity into an evaporation space and a gaseous refrigerant space, and the evaporating element is located in the evaporation space; a cooling system return air pipe, which is arranged on the main shell and is used to connect the evaporation space and the cooling return pipeline; an exhaust port, which is arranged on the main shell and is connected to the gaseous refrigerant space, and the exhaust port is used to be connected to the suction end of the compressor.

[0006] In one embodiment, the evaporator further includes: a refrigerant system return pipe, which is arranged on the main shell and is used to connect the evaporation space and the refrigerant return pipeline.

[0007] In one embodiment, the evaporator further comprises: a liquid balancing plate, which is arranged in the evaporation space and located above the evaporation element.

[0008] In one embodiment, the output end of the cooling system return air pipe and / or the output end of the refrigerant system return air pipe is located above the liquid equalizing plate.

[0009] In one embodiment, the output end of the cooling system return air pipe and / or the output end of the refrigerant system return air pipe is located below the liquid equalizing plate.

[0010] In one embodiment, the evaporator is a falling film evaporator or a flooded evaporator.

[0011] In one embodiment, the evaporator further comprises a cooling water inlet and a cooling water outlet respectively connected to the evaporation element.

[0012] The present application also provides an air conditioning unit, including an evaporator, and the evaporator is the evaporator mentioned above.

[0013] In one embodiment, the air-conditioning unit includes a compressor and a motor driven by the compressor. The air-conditioning unit also includes a cooling supply pipeline and a cooling return pipeline respectively connected to the motor. The suction end of the compressor is connected to the exhaust port, and the cooling return pipeline is connected to the return air pipe of the cooling system.

[0014] In one embodiment, the air conditioning unit is a central air conditioning unit.

[0015] In the above embodiment, the cooling system return air pipe can be connected to the cooling return pipeline, for example, connected to the cooling return pipeline connected to the motor, so that the refluxed cooling refrigerant in the gas-liquid mixed state that has not been completely evaporated will be completely returned to the evaporation space. Under the action of the gas-liquid filter, the liquid refrigerant can be filtered out, and only the gaseous refrigerant is supplied to the suction end of the compressor through the exhaust port connected to the gaseous refrigerant space, thereby preventing the abnormal suction of liquid caused by the compressor inhaling incompletely evaporated liquid refrigerant, and avoiding the decline in unit performance and reliability and shortened service life caused by suction of liquid. BRIEF DESCRIPTION OF THE DRAWINGS

[0016] The drawings constituting a part of this application are used to provide a further understanding of the present invention. The exemplary embodiments of the present invention and their descriptions are used to explain the present invention and do not constitute an improper limitation of the present invention. In the drawings:

[0017] Figure 1 Schematic diagram of the structure of an evaporator according to an embodiment of the present invention. DETAILED DESCRIPTION

[0018] In order to make the purpose, technical solution and advantages of the present invention more clearly understood, the present invention is further described in detail below in conjunction with the embodiments and the accompanying drawings. Here, the illustrative embodiments of the present invention and their descriptions are used to explain the present invention, but are not intended to limit the present invention.

[0019] Aiming at the shortcomings of the existing technology, such as Figure 1As shown, the present invention provides an embodiment of an evaporator, which includes a main shell 10, an evaporating element, a gas-liquid filter 20, a cooling system return air pipe 30 and an exhaust port 40. A cavity is formed in the main shell 10, and the evaporating element is arranged in the cavity. The gas-liquid filter 20 is arranged in the cavity to separate the cavity into an evaporation space 11 and a gaseous refrigerant space 12, and the evaporating element is located in the evaporation space 11. The cooling system return air pipe 30 is arranged on the main shell 10, and is used to connect the evaporation space 11 and the cooling return line. The exhaust port 40 is arranged on the main shell 10 and is connected to the gaseous refrigerant space 12. The exhaust port 40 is used to be connected to the suction end of the compressor.

[0020] By applying the technical solution of the present invention, the cooling system return air pipe 30 can be connected to the cooling return pipeline, for example, connected to the cooling return pipeline connected to the motor, so that the refluxed cooling refrigerant in the gas-liquid mixed state that has not been completely evaporated will be completely returned to the evaporation space 11. Under the action of the gas-liquid filter 20, the liquid refrigerant can be filtered out, and only the gaseous refrigerant is supplied to the suction end of the compressor through the exhaust port 40 connected to the gaseous refrigerant space 12, thereby preventing the abnormal suction of liquid caused by the compressor inhaling the liquid refrigerant that has not been completely evaporated, and avoiding the reduction of unit performance and reliability and shortened service life due to suction of liquid.

[0021] In addition, by adopting the above-mentioned technical solution, the requirements for the cooling control accuracy of components such as motors can be cancelled or reduced, and the cost can be reduced and the control can be simplified under the premise of ensuring that the cooling requirements of the motors are met. Specifically, the cooling system of the motor can be simplified in design in combination with cost and simplified control considerations: the flow rate for motor cooling is designed, and the cooling amount A1 required under the maximum load of the motor is calculated. The cooling amount A required by the system is equal to or slightly greater than A1. The control of the cooling flow rate can be cancelled under the premise of meeting the cooling requirements. Since the above-mentioned evaporator can prevent the return air containing liquid refrigerant from being sucked into the compressor due to excessive cooling, the control system for motor cooling can be cancelled or the control accuracy of motor cooling can be reduced to reduce costs.

[0022] like Figure 1 As shown, more preferably, in the technical solution of the present invention, the evaporator further includes a refrigerant system return pipe 50, which is arranged on the main shell 10 and is used to connect the evaporation space 11 and the refrigerant return pipeline. The refrigerant system return pipe 50 can be connected to other functional components of the refrigerant system for returning air, which can be a condenser or an electronic control assembly.

[0023] More preferably, the evaporator further comprises a liquid balancing plate 60, which is arranged in the evaporation space 11 and above the evaporation element. In actual use, the liquid balancing plate 60 is used to balance the cold refrigerant entering the evaporation space 11, so that the liquid refrigerant falls on the evaporation element more evenly for evaporation.

[0024] like Figure 1 As shown, in the technical solution of this embodiment, the output end of the cooling system return air pipe 30 and / or the output end of the refrigerant system return air pipe 50 are located below the liquid equalizing plate 60. Since in the technical solution of this embodiment, the return air flow rate in the cooling system return air pipe 30 and / or the refrigerant system return air pipe 50 is relatively high, the high-speed air flow directly impacts the liquid refrigerant on the liquid equalizing plate 60, which will cause uneven liquid distribution on the liquid equalizing plate 60, resulting in the evaporation element not being completely and evenly showered, resulting in a reduction in the heat exchange area, affecting the performance of the unit.

[0025] As another optional embodiment, the output end of the cooling system return air pipe 30 and / or the output end of the refrigerant system return air pipe 50 may also be located above the liquid equalizing plate 60. This embodiment corresponds to the situation where the return air velocity in the cooling system return air pipe 30 and / or the refrigerant system return air pipe 50 is low, so that the liquid equalizing plate 60 can also be used to equalize the liquid refrigerant in the gas-liquid mixed state.

[0026] It should be noted that the technical solution of the present invention is particularly applicable to falling film evaporators or flooded evaporators. Optionally, in the falling film evaporator or flooded evaporator, the evaporator further includes a cooling water inlet 13 and a cooling water outlet 14 respectively connected to the evaporation element.

[0027] The present invention also provides an air conditioning unit, which includes the above-mentioned evaporator. The air conditioning unit using the above-mentioned evaporator can prevent the compressor from sucking in liquid refrigerant that has not been completely evaporated, thereby preventing the unit performance and reliability from being reduced and the service life from being shortened due to the liquid refrigerant being sucked in.

[0028] Optionally, the air conditioning unit includes a compressor and a motor connected to the compressor, and the air conditioning unit also includes a cooling supply pipeline and a cooling return pipeline connected to the motor respectively. In actual use, the air intake end of the compressor is connected to the exhaust port 40, and the cooling return pipeline is connected to the cooling system return pipe 30.

[0029] It should be noted that the technical solution of the air conditioning unit of the present invention is particularly suitable for central air conditioning units. It should be noted that for central air conditioning units, the power of the compressor is relatively large, and the negative pressure that can be generated by the air intake port of the compressor under high load conditions is very large, which is easy to cause the problem of inhalation of liquid due to the refrigerant that is not completely evaporated in the return pipe being sucked into the compressor. In the technical solution of the present invention, the output end of the cooling system return pipe 30 is arranged below the gas-liquid filter 20, and the gas-liquid filter 20 is used to isolate and filter the unevaporated liquid refrigerant in the cooling system return pipe 30, so as to prevent the liquid refrigerant from being sucked into the air intake end of the compressor and causing the problem of inhalation of liquid.

[0030] In summary, the technical solution of the present invention effectively solves the problems of liquid inhalation and uneven liquid separation caused by the return air pipe containing liquid refrigerant during the operation of the compressor. Since the motor cooling adopts the system refrigerant throttling to cool the motor winding, the flow rate of the refrigerant is difficult to control. In order to prevent the motor winding from overheating, a certain amount of cooling margin can be reserved, and the system can be set to return air to below the gas-liquid filter 20, thereby solving the problems of insufficient cooling and liquid inhalation. Compared with the system that directly controls the cooling amount of the motor, this solution can cancel the control of the motor cooling or reduce its control accuracy, simplify the structure and reduce the cost. This solution can be used for refrigeration equipment that needs to return air to the evaporator in the cooling system, and has a wide range of uses. For systems using falling film evaporators, it can prevent the high-speed airflow of the cooling system return air pipe 30 and / or the refrigerant system return air pipe 50 from impacting the refrigerant and causing uneven liquid separation, thereby ensuring the performance of the unit.

[0031] The above description is only a preferred embodiment of the present invention and is not intended to limit the present invention. For those skilled in the art, the embodiments of the present invention may have various modifications and variations. Any modification, equivalent replacement, improvement, etc. made within the spirit and principle of the present invention shall be included in the protection scope of the present invention.

Claims

1. An evaporator, comprising: A main housing (10), wherein a cavity is formed in the main housing (10); an evaporation element, disposed in the cavity; Characterized in that the evaporator further comprises: A gas-liquid filter (20) is arranged in the cavity to separate the cavity into an evaporation space (11) and a gaseous refrigerant space (12); the evaporation element is located in the evaporation space (11); A cooling system return air pipe (30), arranged on the main shell (10) and used for connecting the evaporation space (11) and a cooling return pipeline; An exhaust port (40) is arranged on the main shell (10) and is connected to the gaseous refrigerant space (12). The exhaust port (40) is used to be connected to the suction end of the compressor.

2. The evaporator according to claim 1, characterized in that The evaporator further comprises: a refrigerant system return pipe (50), which is arranged on the main shell (10) and is used to connect the evaporation space (11) and the refrigerant return pipeline.

3. The evaporator according to claim 2, characterized in that The evaporator further comprises: a liquid balancing plate (60), wherein the liquid balancing plate (60) is arranged in the evaporation space (11) and is located above the evaporation element.

4. The evaporator according to claim 3, characterized in that The output end of the cooling system return air pipe (30) and / or the output end of the refrigerant system return air pipe (50) is located above the liquid balancing plate (60).

5. The evaporator according to claim 3, characterized in that The output end of the cooling system return air pipe (30) and / or the output end of the refrigerant system return air pipe (50) are located below the liquid balancing plate (60).

6. The evaporator according to claim 1, characterized in that The evaporator is a falling film evaporator or a flooded evaporator.

7. The evaporator according to claim 6, characterized in that The evaporator further comprises a cooling water inlet (13) and a cooling water outlet (14) respectively connected to the evaporation element.

8. An air conditioning unit, comprising an evaporator, characterized in that: The evaporator is the evaporator according to any one of claims 1 to 7.

9. The air conditioning unit according to claim 8, characterized in that: The air conditioning unit comprises a compressor and a motor connected to the compressor, and the air conditioning unit also comprises a cooling supply pipeline and a cooling return pipeline respectively connected to the motor, the air intake end of the compressor is connected to the exhaust port (40), and the cooling return pipeline is connected to the cooling system return pipe (30).

10. The air conditioning unit according to claim 8, characterized in that: The air conditioning unit is a central air conditioning unit.

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