A rotor internal cooling structure

Abstract

This utility model relates to the field of vacuum pump technology, specifically disclosing an internal rotor cooling structure disposed within a vacuum pump. The vacuum pump includes a drive motor, a motor base, an end cover, a rotor assembly, and a pump housing. The internal rotor cooling structure includes a delivery pipe for the flow of a first cooling medium. The delivery pipe extends into the rotor assembly, and a return channel is provided between the delivery pipe and the inner wall of the rotor assembly for the return flow of the first cooling medium. This utility model achieves cooling and heat dissipation inside the rotor while simultaneously enabling the return flow of the cooling medium, providing a stable and effective heat dissipation effect at the rotor end.

Description

Technical Field

[0001] This utility model relates to the field of vacuum pump technology, specifically to an internal cooling structure for a rotor. Background Technology

[0002] A vacuum pump is a device or equipment that uses mechanical, physical, chemical, or physicochemical methods to evacuate a container and create a vacuum. A screw vacuum pump is a type of vacuum pump used in semiconductors, lithium batteries, photovoltaics, steel, chemicals, petroleum, light industry, pharmaceuticals, and food. Because vacuum pumps generate significant heat in multiple parts during operation, heat dissipation is necessary to ensure normal operation. For rotor cooling, a vacuum pump screw rotor cooling device disclosed in patent CN109681430A cools the rotor by installing a coolant pipe inside the screw rotor and spraying coolant. However, this structure cannot achieve coolant return and requires the pipe to completely penetrate the rotor, affecting rotor strength. Utility Model Content

[0003] The purpose of this invention is to provide an internal cooling structure for a rotor to solve the problems mentioned in the background art.

[0004] To solve the above-mentioned technical problems, this utility model is achieved through the following technical solution: an internal cooling structure for a rotor is provided inside a vacuum pump. The vacuum pump includes a drive motor, a motor base, an end cover, a rotor assembly, and a pump housing. The internal cooling structure for the rotor includes a delivery pipe for a first cooling medium to circulate. The delivery pipe extends into the rotor assembly, and a return channel is provided between the delivery pipe and the inner wall of the rotor assembly for the first cooling medium to return.

[0005] Furthermore, the end caps are disposed at both ends of the pump housing, and the motor mount is connected to one of the end caps. The motor mount is used to mount the drive motor.

[0006] Furthermore, the rotor assembly includes two meshing screw rotors, each screw rotor having inward recesses at both ends forming a cooling chamber, the cooling chamber being coaxially arranged with the screw rotor.

[0007] Furthermore, the screw rotor is provided with connecting pipes at both ends, the connecting pipes extend into the end caps, the end caps are provided with injection channels for the first cooling medium to flow through, and one end of the connecting pipe is inserted into the injection channel.

[0008] Furthermore, the connecting pipe covers and communicates with the opening of the cooling chamber. The connecting pipe has a liquid passage, and the end of the liquid passage facing the cooling chamber forms a liquid outlet. A return port is provided outside the liquid outlet. The conveying pipe passes through the liquid passage and exits through the liquid outlet. The conveying pipe is in contact with the liquid outlet. A return channel is formed between the outer wall of the conveying pipe and the inner wall of the liquid passage. The return port is connected to the cooling chamber and the return channel.

[0009] Furthermore, the return port is inclined.

[0010] This utility model has the following beneficial effects:

[0011] This invention achieves cooling and heat dissipation inside the rotor, while also enabling the return flow of the cooling medium, providing a stable and effective heat dissipation effect at the rotor end. Attached Figure Description

[0012] To more clearly illustrate the technical solutions of the embodiments of this utility model, the accompanying drawings used in the description of the embodiments will be briefly introduced below. Obviously, the drawings described below are only some embodiments of this utility model. For those skilled in the art, other drawings can be obtained based on these drawings without creative effort.

[0013] Figure 1 This is a schematic diagram of the internal cooling structure of the rotor in Example 1;

[0014] Figure 2 for Figure 1 A cross-sectional schematic diagram;

[0015] Figure 3 for Figure 2 A magnified view of a portion of the image;

[0016] Figure 4 for Figure 3 A partial schematic diagram. Detailed Implementation

[0017] The technical solutions of the present utility model will be clearly and completely described below with reference to the accompanying drawings of the embodiments. Obviously, the described embodiments are only some embodiments of the present utility model, and not all embodiments. Based on the embodiments of the present utility model, all other embodiments obtained by those of ordinary skill in the art without creative effort are within the protection scope of the present utility model.

[0018] Example 1

[0019] like Figures 1-4As shown, the internal cooling structure of the rotor in this embodiment is set inside the vacuum pump. The vacuum pump includes a drive motor, a motor base 1, an end cover 2, a rotor assembly, and a pump housing. The rotor assembly is housed within the pump housing. Two end covers 2 are set at both ends of the pump housing. The motor base 1 is connected to one end cover 2. The motor base 1 is used to house the drive motor. The drive motor, in a conventional manner, uses gears and other transmission structures to drive the rotor assembly to rotate and achieve air extraction.

[0020] The rotor assembly includes two meshing screw rotors 30. The two ends of the screw rotors 30 have inward recesses that form cooling chambers 31, which are coaxially arranged with the screw rotors 30.

[0021] Specifically, the internal cooling structure of this rotor mainly includes a conveying pipe 10, which provides a first cooling medium for circulation. The conveying pipe 10 is inserted into the rotor assembly, and there is a return channel 20 between the conveying pipe 10 and the inner wall of the rotor assembly. The return channel 20 provides a return flow for the first cooling medium.

[0022] The screw rotor 30 has connecting pipes 40 at both ends, which extend into the end cap 2. The end cap 2 has an injection channel for the flow of the first cooling medium. One end of the connecting pipe 40 is inserted into the injection channel, and the first cooling medium can be cooling oil.

[0023] Furthermore, the ends of the connecting pipe body 40 and the screw rotor 30 are connected by bolts and other components. The connecting pipe body 40 covers the opening of the cooling chamber 31 and communicates with the cooling chamber 31. The connecting pipe body 40 has a liquid passage 41. The end of the liquid passage 41 facing the cooling chamber 31 forms a liquid outlet 42. A return port 51 is provided on the outside of the liquid outlet 42. The conveying pipe body 10 passes through the liquid passage 41 and exits through the liquid outlet 42. A return channel 20 is formed between the outer wall of the conveying pipe body 10 and the inner wall of the liquid passage 41. The return port 51 is connected to the cooling chamber 31 and the return channel 20.

[0024] Here, the delivery pipe 10 is fitted to the liquid outlet 42, that is, the outer wall of the delivery pipe 10 is fitted to the inner wall of the liquid outlet 42 to prevent leakage.

[0025] Here, the return port 51 is set at an angle, and the end of the return port 51 connected to the return channel 20 is lower than the end away from the return channel 20, which facilitates the guidance of return flow.

[0026] Thus, the first cooling medium is introduced from the outside through the conveying pipe 10 into the cooling chamber 31, cools the rotor, and then flows back from the return port 51, and flows back to the end cover 2 through the return channel 20, and then flows out from the end cover 2. Here, the first cooling medium can be heat exchanged outside and then sent back into the conveying pipe 10.

[0027] The preferred embodiments of this utility model disclosed above are merely illustrative of the present utility model. These preferred embodiments do not exhaustively describe all details, nor do they limit the utility model to the specific implementations described. Clearly, many modifications and variations can be made based on the content of this specification. This specification selects and specifically describes these embodiments to better explain the principles and practical applications of this utility model, thereby enabling those skilled in the art to better understand and utilize it. This utility model is limited only by the claims and their full scope and equivalents.

Claims

1. A rotor internal cooling structure provided in a vacuum pump including a driving motor, a motor base, an end cover, a rotor set, and a pump housing, characterized by, The internal cooling structure of the rotor includes a conveying pipe body for the flow of a first cooling medium. The conveying pipe body extends into the rotor assembly, and a return channel is provided between the conveying pipe body and the inner wall of the rotor assembly for the return of the first cooling medium.

2. A rotor internal cooling structure according to claim 1, characterized in that: The end caps are located at both ends of the pump housing, and the motor mount is connected to one of the end caps. The motor mount is used to mount the drive motor.

3. A rotor internal cooling structure according to claim 2, wherein: The rotor assembly includes two meshing screw rotors, each screw rotor having inward recesses at both ends forming a cooling chamber, which is coaxially arranged with the screw rotor.

4. A rotor internal cooling structure according to claim 3, characterized in that: The screw rotor is provided with connecting pipes at both ends, the connecting pipes extend into the end caps, the end caps are provided with injection channels for the first cooling medium to flow through, and one end of the connecting pipe is inserted into the injection channel.

5. A rotor internal cooling structure according to claim 4, characterized in that: The connecting pipe covers and communicates with the opening of the cooling chamber. The connecting pipe has a liquid passage, and the end of the liquid passage facing the cooling chamber forms a liquid outlet. A return port is provided outside the liquid outlet. The conveying pipe passes through the liquid passage and exits through the liquid outlet. The conveying pipe is in contact with the liquid outlet. A return channel is formed between the outer wall of the conveying pipe and the inner wall of the liquid passage. The return port is connected to the cooling chamber and the return channel.

6. A rotor internal cooling structure according to claim 5, wherein: The return port is set at an angle.

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