Condensate water cooling prevention structure of magnetic suspension bearing controller

Abstract

The utility model relates to a condensed water cooling prevention structure for a magnetic suspension bearing controller, which comprises a motor shell, a cooling plate is connected to the outer side part of the motor shell, a cooling cavity is formed between the cooling plate and the motor shell, a bearing control plate used for mounting a bearing controller is connected to the outer side of the cooling plate, a heat insulation plate is arranged in the cooling cavity, and the heat insulation plate is connected with the motor shell. And the motor shell is provided with a cooling inlet communicated with the cooling cavity and a cooling outlet communicated with the cooling cavity and a motor cavity in the motor shell. The condensed water cooling prevention structure of the magnetic suspension bearing controller is beneficial to temperature control of the bearing controller, so that the bearing controller can operate in an optimal temperature range; the influence of motor cooling on cooling of the bearing controller is reduced, the bearing controller is prevented from being damaged by condensate water, and meanwhile the situation that the temperature of the bearing controller exceeds the maximum limit value due to the fact that the temperature of a motor shell is too high can be avoided; a cooling loop is simplified, and arrangement of external pipelines is reduced.

Description

Technical Field

[0001] This utility model relates to the field of magnetic levitation centrifugal compressors, and in particular to a condensate-proof cooling structure for a magnetic levitation bearing controller. Background Technology

[0002] The main difference between magnetic levitation centrifugal compressors and other centrifuges lies in the use of magnetic levitation bearings in the motor. Magnetic levitation bearings require a matching bearing controller. Since the bearing controller is electrically driven, it generates heat during operation. As this heat accumulates, the controller's temperature gradually rises. When the temperature reaches the controller's protection threshold, it activates a protection program and stops operating, causing the magnetic levitation centrifuge to cease operation. Therefore, the bearing controller requires cooling during operation. Some manufacturers choose to place the magnetic levitation bearing controller outside the compressor, in a separate cabinet. This design is not conducive to compressor integration. If the bearing controller is integrated into the compressor body, a protective cover must be installed on the outside of the controller, placing it in a relatively enclosed space. Using air cooling would then be insufficient to effectively dissipate heat quickly.

[0003] Therefore, the usual solution is to mount the bearing controller on the surface of the motor housing, and regulate the temperature of the bearing controller by controlling the temperature of the motor housing. Since the stator is the main heat source in the motor of a magnetic levitation centrifuge, and the heat generation fluctuates significantly during operation, a large flow of refrigerant is typically used to cool the stator to ensure normal motor operation, which can lead to excessively low motor housing temperatures. Because the bearing controller is integrated into the motor housing, the low temperature of the motor housing will also be conducted to the bearing controller, resulting in condensation. Since the bearing controller contains numerous circuit boards, the presence of condensation can damage these boards, preventing the magnetic levitation centrifugal compressor from operating. Furthermore, because the protection temperature of the motor stator is usually much higher than that of the bearing controller, there are instances where the motor stator is within its normal operating temperature range, but the motor housing temperature is high, causing the bearing controller to exceed its alarm temperature and stop operating.

[0004] Therefore, the above cooling solutions pose significant risks and are not conducive to the long-term stable operation of the compressor. Utility Model Content

[0005] In view of this, the purpose of this utility model is to provide a cooling structure for magnetic levitation bearing controller that prevents condensation, simplifies the cooling circuit, facilitates temperature control of the bearing controller, reduces the impact of motor stator cooling on bearing control board cooling, keeps it operating within the optimal temperature range, and prevents condensation.

[0006] This utility model is implemented using the following scheme: a cooling structure for a magnetic levitation bearing controller to prevent condensation, including a motor housing, a cooling plate connected to the outer side of the motor housing, a cooling cavity formed between the cooling plate and the motor housing, a bearing control plate for installing the bearing controller connected to the outer side of the cooling plate, a heat insulation plate provided in the cooling cavity, and a cooling inlet communicating with the cooling cavity and a cooling outlet communicating with the cooling cavity and the motor cavity inside the motor housing on the motor housing.

[0007] Furthermore, the cooling cavity is rectangular, and the motor housing has a liquid inlet hole at one corner of the cooling cavity that is connected to the cooling inlet. The cooling outlet is located on the opposite side of the cooling cavity from the side where the cooling inlet is located.

[0008] Furthermore, the cooling chamber is separated into an outlet area by a partition strip on the same side as the cooling outlet. The cooling outlet is located within the outlet area. One end of the partition strip has a notch, and the notch and the inlet hole are located diagonally opposite each other in the cooling chamber.

[0009] Furthermore, the cooling plate has a cooling plate protrusion on the other side of the cooling cavity, and the motor housing has a motor housing protrusion on the other side of the cooling cavity. The cooling plate protrusion and the motor housing protrusion are closely attached to each other to form the partition strip.

[0010] Furthermore, a flange plate is connected to the side of the motor housing by screws, and the cooling inlet is provided on the flange plate. The cooling inlet is connected to the liquid inlet through a channel inside the motor housing, and an O-ring is provided between the flange plate and the motor housing.

[0011] Furthermore, the inner side of the cooling plate is provided with an S-shaped cooling channel within the cooling cavity.

[0012] Furthermore, the inner side of the cooling plate is provided with an annular boss forming a circle around the cooling cavity. The annular boss is in close contact with the outer side of the motor housing. A sealing groove is provided on the annular boss, and an O-ring is provided in the sealing groove.

[0013] Furthermore, a gap is left between the cooling plate and the motor housing around the annular boss.

[0014] Furthermore, the bearing control plate is connected to the outside of the cooling plate by screws, and a heat-conducting pad is sandwiched between the bearing control plate and the cooling plate.

[0015] Compared with the prior art, the present invention has the following advantages: The anti-condensation cooling structure of the magnetic levitation bearing controller of the present invention is beneficial to the temperature control of the bearing controller, keeping it in the optimal temperature range and preventing the generation of condensation; it helps to reduce the impact of motor cooling on the cooling of the bearing controller, avoiding damage to the bearing controller caused by condensation, and also preventing the bearing controller temperature from exceeding the maximum limit due to excessively high motor housing temperature; it helps to simplify the cooling circuit and reduce the setting of external pipelines; it improves the cooling efficiency, simplifies the control logic of the bearing controller, and is conducive to the long-term stable operation of the magnetic levitation centrifuge.

[0016] To make the objectives, technical solutions, and advantages of this utility model clearer, the present utility model will be further described in detail below through specific embodiments and related drawings. Attached Figure Description

[0017] Figure 1 This is a vertical sectional view of an embodiment of the present utility model;

[0018] Figure 2 This is a cross-sectional view of an embodiment of the present utility model;

[0019] Figure 3 This is a side view of the motor housing according to an embodiment of the present utility model;

[0020] Figure 4 This is a schematic diagram of the heat insulation board structure according to an embodiment of the present utility model;

[0021] Figure 5 This is a schematic diagram of the inner side structure of the cooling plate in an embodiment of this utility model;

[0022] The following are the labels in the diagram: 1-Motor housing, 2-Heat insulation plate, 3-O-ring, 4-Cooling plate, 5-Thermal pad, 6-Bearing control plate, 7-Screw, 8-Flange plate, 9-Cooling inlet, 10-S-shaped cooling channel, 11-Cooling outlet, 12-Motor cavity, 13-Motor housing protrusion, 14-Cooling plate protrusion, 15-Liquid inlet hole, 16-Notch, 17-Liquid outlet area, 18-Cooling cavity, 19-Annular boss. Detailed Implementation

[0023] It should be noted that the following detailed descriptions are exemplary and intended to provide further explanation of this application. Unless otherwise specified, all technical and scientific terms used herein have the same meaning as commonly understood by one of ordinary skill in the art to which this application pertains.

[0024] It should be noted that the terminology used herein is for the purpose of describing particular embodiments only and is not intended to limit the exemplary embodiments according to this application. As used herein, the singular form is intended to include the plural form as well, unless the context clearly indicates otherwise. Furthermore, it should be understood that when the terms "comprising" and / or "including" are used in this specification, they indicate the presence of features, steps, operations, devices, components, and / or combinations thereof.

[0025] like Figures 1-5 As shown, a cooling structure for a magnetic levitation bearing controller to prevent condensation includes a motor housing 1. A cooling plate 4 is connected to the outer side of the motor housing 1, forming a cooling cavity between the cooling plate 4 and the motor housing 1. Grooves are excavated on the inner side of the cooling plate and the outer side of the motor housing, forming the cooling cavity 18. A bearing control plate 6 for mounting the bearing controller is connected to the outer side of the cooling plate 4. A heat insulation plate 2 is provided inside the cooling cavity. The motor housing 1 has a cooling inlet 9 communicating with the cooling cavity and a cooling outlet 11 connecting the cooling cavity and the motor cavity inside the motor housing. A refrigerant outlet is also provided in the motor cavity of the motor housing. The cooling chamber and the cooling inlet and outlet machined on the motor housing form a complete cooling circuit, with the refrigerant ultimately entering the motor chamber without the need for additional piping. This simplifies the cooling circuit, reduces the need for external piping, and lowers assembly difficulty. Insulating the cooling chamber with a heat shield reduces heat transfer between the motor housing and the cooling shield, preventing mutual interference between the two cooling systems. This also ensures that the cooling system does not interfere with the motor stator's cooling channels, minimizing the impact of stator cooling on the bearing control board's cooling. This simplifies control logic, optimizes cooling performance, and facilitates temperature control of the bearing controller, keeping it within its optimal temperature range and preventing condensation. Integrating the bearing control board onto the compressor reduces the compressor system's size and improves its overall performance.

[0026] In this embodiment, the heat insulation plate 2 is made of nylon. Compared with the aluminum material of the motor housing and the cooling plate, nylon can significantly reduce the heat transfer between the motor housing and the cooling plate, avoid mutual interference between the two cooling systems, and prevent condensation from forming on the bearing control board due to a large refrigerant supply when cooling the motor, which could lead to damage to the bearing control board. It can also prevent the bearing control board from overheating due to a small refrigerant supply when cooling the motor, which could cause the bearing controller to alarm and lead to the magnetic levitation centrifugal compressor to malfunction and shut down. After installing the heat insulation plate 2, the gap between the heat insulation plate 2 and the cooling plate 4 is only 0.2mm, which not only ensures external sealing but also restricts most of the refrigerant to flow along the S-shaped cooling channel 10.

[0027] In this embodiment, the cooling cavity is rectangular, and the motor housing has a liquid inlet 15 connected to the cooling inlet at one corner of the cooling cavity. The cooling outlet is located on the opposite side of the cooling cavity from the side where the cooling inlet is located. The liquid inlet 15 and the cooling outlet 11 are arranged on opposite sides of the cooling cavity, which increases the cooling area of ​​the refrigerant.

[0028] In this embodiment, the cooling chamber is divided into a liquid outlet area 17 by a partition strip on the same side as the cooling outlet. The cooling outlet is located within the liquid outlet area. One end of the partition strip has a notch 16, and the notch 16 and the liquid inlet 15 are located diagonally opposite each other in the cooling chamber. The partition strip can isolate the refrigerant, allowing the refrigerant to flow along the diagonal direction of the cooling chamber, increasing the cooling area and enhancing the cooling effect.

[0029] In this embodiment, the cooling plate 4 is made of aluminum alloy, which has good thermal conductivity. The cooling plate 4 is connected to the motor housing by screws. The screws are not evenly distributed. The screw holes at the four corners are closer to the sealing surface, which reduces the risk of refrigerant leakage. The cooling plate 4 has a cooling plate protrusion 14 on the other side of the cooling cavity, and the motor housing has a motor housing protrusion 13 on the other side of the cooling cavity. The cooling plate protrusion 14 and the motor housing protrusion 13 are closely attached to each other to form the partition strip.

[0030] In this embodiment, a steel flange 8 is screwed to the side of the motor housing, which is more reliable and durable than the aluminum alloy material of the motor housing when connecting external pipes. The cooling inlet 9 is located on the flange 8 and is connected to the liquid inlet 15 through a channel inside the motor housing 1. An O-ring is provided between the flange 8 and the motor housing. The flange 8 at the cooling inlet connects to the motor housing, preventing external pipes from damaging the threads of the motor housing and causing the entire motor housing to be scrapped.

[0031] In this embodiment, the inner side of the cooling plate is provided with an S-shaped cooling channel 10 in the cooling cavity, which is beneficial to control the flow direction of the refrigerant, increases the flow time, increases the cooling area, and enhances the cooling effect.

[0032] In this embodiment, the inner side of the cooling plate is provided with an annular boss 19 surrounding the cooling cavity. The annular boss is in close contact with the outer side of the motor housing. A sealing groove is provided on the annular boss, and an O-ring is provided in the sealing groove to ensure the sealing of the refrigerant in the cooling cavity. The annular boss 19 is used to seal the cooling cavity, which can reduce the sealing contact surface, reduce the processing difficulty of the cooling plate, and improve the sealing effect.

[0033] In this embodiment, a gap is left between the cooling plate and the motor housing around the annular boss. The annular boss 19 is provided so that a gap is formed around the annular boss 19, which reduces the heat transfer area between the cooling plate and the motor housing and reduces the impact of the motor housing on the cooling of the bearing control plate.

[0034] In this embodiment, the bearing control plate 6 is connected to the outside of the cooling plate 4 by screws, and a heat-conducting pad 5 is sandwiched between the bearing control plate and the cooling plate, which enhances the heat conduction performance and also avoids the decrease in heat conduction performance due to the inability of the plates to fit completely together.

[0035] Unless otherwise stated, if any of the technical solutions disclosed in this utility model discloses a numerical range, then the disclosed numerical range is a preferred numerical range. Any person skilled in the art should understand that the preferred numerical range is merely one among many feasible numerical values ​​that has a more obvious or representative technical effect. Because there are many numerical values, it is impossible to list them all. Therefore, this utility model discloses only some numerical values ​​to illustrate the technical solutions of this utility model. Furthermore, the numerical values ​​listed above should not constitute a limitation on the scope of protection of this utility model.

[0036] If this utility model discloses or relates to mutually fixedly connected parts or structural components, then unless otherwise stated, a fixed connection can be understood as: a detachable fixed connection (e.g., using bolts or screws), or a non-detachable fixed connection (e.g., riveting, welding). Of course, mutually fixed connections can also be replaced by an integral structure (e.g., manufactured by integral molding using a casting process) (except where it is obviously impossible to use an integral molding process).

[0037] In addition, unless otherwise stated, the terms used to indicate positional relationships or shapes in any of the technical solutions disclosed in this utility model above include states or shapes that are similar to, close to, or approximate with them.

[0038] Any component provided by this utility model can be assembled from multiple individual components, or it can be a single component manufactured by a one-piece molding process.

[0039] The above description is merely a preferred embodiment of this utility model and is not intended to limit the utility model in any other way. Any person skilled in the art may make changes or modifications to the disclosed technical content to create equivalent embodiments. However, any simple modifications, equivalent changes, and modifications made to the above embodiments based on the technical essence of this utility model without departing from its technical solution shall still fall within the protection scope of this utility model.

Claims

1. A cooling structure for preventing condensation in a magnetic levitation bearing controller, comprising a motor housing, characterized in that: A cooling plate is connected to the outer side of the motor housing, and a cooling cavity is formed between the cooling plate and the motor housing. A bearing control plate for installing a bearing controller is connected to the outer side of the cooling plate. A heat insulation plate is provided inside the cooling cavity. The motor housing is provided with a cooling inlet that communicates with the cooling cavity and a cooling outlet that connects the cooling cavity and the motor cavity inside the motor housing.

2. The anti-condensation cooling structure for the magnetic levitation bearing controller according to claim 1, characterized in that: The cooling chamber is rectangular. The motor housing has a liquid inlet hole at one corner of the cooling chamber that is connected to the cooling inlet. The cooling outlet is located on the opposite side of the cooling chamber from the side where the cooling inlet is located.

3. The anti-condensation cooling structure for the magnetic levitation bearing controller according to claim 2, characterized in that: The cooling chamber is separated into an outlet area by a partition strip on the same side as the cooling outlet. The cooling outlet is located in the outlet area. One end of the partition strip has a notch, and the notch and the inlet hole are located diagonally opposite to each other in the cooling chamber.

4. The anti-condensation cooling structure for the magnetic levitation bearing controller according to claim 3, characterized in that: The cooling plate has a cooling plate protrusion on the other side of the cooling cavity, and the motor housing has a motor housing protrusion on the other side of the cooling cavity. The cooling plate protrusion and the motor housing protrusion are closely attached to each other to form the partition strip.

5. The anti-condensation cooling structure for the magnetic levitation bearing controller according to claim 2, characterized in that: The motor housing is connected to a flange plate by screws on the side. The cooling inlet is provided on the flange plate. The cooling inlet is connected to the liquid inlet through a channel inside the motor housing. An O-ring is provided between the flange plate and the motor housing.

6. The anti-condensation cooling structure for the magnetic levitation bearing controller according to claim 1, characterized in that: The inner side of the cooling plate is provided with an S-shaped cooling channel in the cooling cavity.

7. The anti-condensation cooling structure for the magnetic levitation bearing controller according to claim 1, characterized in that: The inner side of the cooling plate has an annular boss forming a circle around the cooling cavity. The annular boss is in close contact with the outer side of the motor housing. A sealing groove is provided on the annular boss, and an O-ring is provided in the sealing groove.

8. The anti-condensation cooling structure for the magnetic levitation bearing controller according to claim 7, characterized in that: A gap is left between the cooling plate and the motor housing around the annular boss.

9. The anti-condensation cooling structure for the magnetic levitation bearing controller according to claim 1, characterized in that: The bearing control board is connected to the outside of the cooling plate by screws, and a heat-conducting pad is sandwiched between the bearing control board and the cooling plate.

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