Internal cooling structure of rotor

Abstract

The invention relates to the technical field of vacuum pumps, and particularly discloses a rotor internal cooling structure which is arranged in a vacuum pump, the vacuum pump comprises a driving motor, a motor base, an end cover, a rotor set and a pump shell, the rotor internal cooling structure comprises a conveying pipe body, and the conveying pipe body is used for circulation of a first cooling medium; the conveying pipe body penetrates into the rotor set, a backflow channel is arranged between the conveying pipe body and the inner wall of the rotor set, and a first cooling medium flows back through the backflow channel. Cooling and heat dissipation of the interior of the rotor are achieved, meanwhile, backflow of a cooling medium is achieved, and a stable and effective rotor end heat dissipation effect is provided.

Description

Technical Field

[0001] The present invention relates to the technical field of vacuum pumps, in particular to a rotor internal cooling structure. Background Art

[0002] A vacuum pump refers to a device or equipment that uses mechanical, physical, chemical or physicochemical methods to evacuate the container to obtain a vacuum. A screw vacuum pump is a type of vacuum pump and is used in semiconductors, lithium batteries, photovoltaics, steel, chemicals, petroleum, light industry, medicine and food. Since a vacuum pump generates a large amount of heat in multiple parts during use, it needs to be dissipated to ensure normal operation. For cooling of the rotor, a vacuum pump screw rotor cooling device disclosed in patent number CN109681430A cools the rotor by setting a coolant pipe in the inner cavity of the screw rotor of the screw vacuum pump and spraying coolant. However, this type of structure cannot achieve the reflux of the cooling medium and requires the pipe to be completely laid through the rotor, which affects the strength of the rotor. Summary of the Invention

[0003] The object of the present invention is to provide a rotor internal cooling structure to solve the problems raised in the above background technology.

[0004] In order to solve the above technical problems, the present invention is achieved through the following technical solutions: a rotor internal cooling structure is arranged in a vacuum pump, the vacuum pump includes a driving motor, a motor base, an end cover, a rotor group and a pump casing, the rotor internal cooling structure includes a conveying pipe body, the conveying pipe body is used for the circulation of a first cooling medium, the conveying pipe body penetrates into the rotor group, and a reflux channel is provided between the conveying pipe body and the inner wall of the rotor group, the reflux channel is used for the reflux of the first cooling medium.

[0005] Furthermore, the end covers are arranged at both ends of the pump housing, the motor base is connected to one end cover, and the motor base is used to set the drive motor.

[0006] Furthermore, the rotor assembly includes two meshing screw rotors, both ends of the screw rotors have inward recesses to form a cooling cavity, and the cooling cavity is coaxially arranged with the screw rotor.

[0007] Furthermore, connecting tube bodies are provided at both ends of the screw rotor, and the connecting tube bodies extend into the end cover. An injection channel for the circulation of the first cooling medium is provided on the end cover, and one end of the connecting tube body is inserted into the injection channel.

[0008] Furthermore, the connecting tube body covers the opening of the cooling cavity and is connected to the cooling cavity. The connecting tube body is provided with a liquid passage, and the liquid passage forms a liquid outlet toward one end of the cooling cavity. A liquid return port is provided on the outside of the liquid outlet. The delivery tube body passes through the liquid passage and out of the liquid outlet. The delivery tube body is fitted with the liquid outlet. A reflux channel is formed between the outer wall of the delivery tube body and the inner wall of the liquid passage, and the liquid return port is connected to the cooling cavity and the reflux channel.

[0009] Furthermore, the liquid return port is arranged at an angle.

[0010] The present invention has the following beneficial effects: The present invention realizes cooling and heat dissipation inside the rotor and simultaneously realizes reflux of the cooling medium, thereby providing a stable and effective heat dissipation effect at the rotor end. BRIEF DESCRIPTION OF THE DRAWINGS

[0011] In order to more clearly illustrate the technical solutions of the embodiments of the present invention, the following briefly introduces the drawings required for describing the embodiments. Obviously, the drawings described below are only some embodiments of the present invention. For ordinary technicians in this field, other drawings can be obtained based on these drawings without creative work.

[0012] Figure 1 Schematic diagram of the rotor internal cooling structure of Example 1; Figure 2 for Figure 1 Schematic cross-sectional view of ; Figure 3 for Figure 2 A partial enlarged schematic diagram; Figure 4 for Figure 3 Partial schematic diagram. DETAILED DESCRIPTION

[0013] The following will clearly and completely describe the technical solutions in the embodiments of the present invention in conjunction with the accompanying drawings. Obviously, the described embodiments are only part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without making creative efforts are within the scope of protection of the present invention.

[0014] Example 1 like Figure 1-Figure 4As shown, the internal cooling structure of the rotor in this embodiment is arranged in a vacuum pump, which includes a drive motor, a motor base 1, an end cover 2, a rotor group and a pump housing. The rotor group is accommodated in the pump housing, and two end covers 2 are arranged 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 set the drive motor, and the drive motor conventionally cooperates with gears and other transmission structures to drive the rotor group to rotate to achieve air extraction.

[0015] The rotor assembly includes two meshing screw rotors 30 . Both ends of the screw rotors 30 have inward recesses to form a cooling cavity 31 . The cooling cavity 31 is coaxially arranged with the screw rotors 30 .

[0016] Specifically, the internal cooling structure of the rotor mainly includes a conveying pipe body 10, which is used for the circulation of the first cooling medium. The conveying pipe body 10 penetrates into the rotor group. There is a reflux channel 20 between the conveying pipe body 10 and the inner wall of the rotor group. The reflux channel 20 is used for the reflux of the first cooling medium.

[0017] Among them, connecting pipe bodies 40 are provided at both ends of the screw rotor 30, and the connecting pipe bodies 40 extend into the end cover 2. The end cover 2 is provided with an injection channel for the circulation of the first cooling medium. One end of the connecting pipe body 40 is inserted into the injection channel. The first cooling medium here can be cooling oil.

[0018] In addition, the connecting pipe body 40 is connected to the end of the screw rotor 30 by bolts and other components. The connecting pipe body 40 covers the opening of the cooling chamber 31 and is connected to the cooling chamber 31. The connecting pipe body 40 has a liquid passage 41 therein, and the liquid passage 41 forms a liquid outlet 42 at one end facing the cooling chamber 31. A return liquid port 51 is provided on the outside of the liquid outlet 42. The conveying pipe body 10 passes through the liquid passage 41 and out of the liquid outlet 42. A reflux 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 liquid port 51 is connected to the cooling chamber 31 and the reflux channel 20.

[0019] Here, the delivery tube body 10 is in close contact with the liquid outlet 42 , that is, the outer wall of the delivery tube body 10 is in close contact with the inner wall of the liquid outlet 42 to prevent leakage.

[0020] Here, the liquid return port 51 is arranged at an angle, and the end of the liquid return port 51 connected to the reflux channel 20 is lower than the end away from the reflux channel 20, so as to facilitate the guidance of reflux.

[0021] Thus, the first cooling medium is introduced from the outside through the conveying pipe body 10 and input into the cooling chamber 31, cools the rotor and then flows back from the return liquid port 51, and flows back into the end cover 2 through the reflux channel 20, and then is drained from the end cover 2 to the outside. Here, the first cooling medium can be re-sent into the conveying pipe body 10 after heat exchange outside.

[0022] The preferred embodiments of the present invention disclosed above are intended only to help illustrate the present invention. These preferred embodiments do not exhaustively describe all details, nor do they limit the present invention to the specific embodiments described. Obviously, many modifications and variations are possible based on the content of this specification. These embodiments are selected and described in detail in this specification to better explain the principles and practical applications of the present invention, thereby enabling those skilled in the art to better understand and utilize the present invention. The present invention is limited only by the claims and their full scope and equivalents.

Claims

1. A rotor internal cooling structure is provided in a vacuum pump, wherein the vacuum pump comprises a drive motor, a motor base, an end cover, a rotor assembly and a pump housing, characterized in that: The rotor internal cooling structure includes a conveying pipe body, which is used for the circulation of a first cooling medium. The conveying pipe body penetrates into the rotor assembly. A reflux channel is provided between the conveying pipe body and the inner wall of the rotor assembly, and the reflux channel is used for the reflux of the first cooling medium.

2. A rotor internal cooling structure according to claim 1, characterized in that: The end covers are arranged at both ends of the pump housing, the motor seat is connected to one end cover, and the motor seat is used to arrange the driving motor.

3. The rotor internal cooling structure according to claim 2, characterized in that: The rotor assembly includes two meshing screw rotors. Both ends of the screw rotors are provided with inward recesses to form a cooling cavity. The cooling cavity is coaxially arranged with the screw rotor.

4. The rotor internal cooling structure according to claim 3, characterized in that: Connecting pipe bodies are provided at both ends of the screw rotor. The connecting pipe bodies extend into the end cover. An injection channel for the first cooling medium to flow is provided on the end cover. One end of the connecting pipe body is inserted into the injection channel.

5. The rotor internal cooling structure according to claim 4, characterized in that: The connecting pipe body covers the opening of the cooling cavity and is in communication with the cooling cavity. The connecting pipe body is provided with a liquid passage. The liquid passage forms a liquid outlet toward one end of the cooling cavity. A liquid return port is provided on the outside of the liquid outlet. The delivery pipe body passes through the liquid passage and out of the liquid outlet. The delivery pipe body is fitted with the liquid outlet. A reflux channel is formed between the outer wall of the delivery pipe body and the inner wall of the liquid passage. The liquid return port is in communication with the cooling cavity and the reflux channel.

6. The rotor internal cooling structure according to claim 5, characterized in that: The liquid return port is arranged obliquely.

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