A screw rotor structure

Abstract

This utility model relates to the field of vacuum pump technology, specifically disclosing a screw rotor structure disposed within a vacuum pump. The vacuum pump includes a pump housing and a drive motor, and includes two meshing screw rotors. Each screw rotor includes a rotor body and a first blade and a second blade spirally wound around the rotor body. The first and second blades rotate in opposite directions and are mirror images of each other. The first and second blades do not intersect, and an air inlet is formed at the midpoint between the two rotor bodies, while an exhaust end is formed near both ends of the rotor body. This utility model achieves a vacuum pumping structure with air inlet in the middle and exhaust at both ends, which can greatly improve pumping efficiency and enhance the stability and smoothness of operation.

Description

Technical Field

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

[0002] In the fields of semiconductors, lithium batteries, photovoltaics, steel, chemicals, petroleum, light industry, pharmaceuticals, and food, vacuum filtration, vacuum feeding, vacuum concentration, and vacuum degassing are often required. These processes all rely on vacuum pumps to achieve the required vacuum conditions. Common vacuum pumps include screw vacuum pumps, which use an internal screw rotor to achieve air extraction. The structure is as shown in the screw-type dry vacuum pump with a combined screw rotor disclosed in patent number CN103062056B. In this type of screw rotor, the blades rotate in the same direction, thereby achieving a structure with air intake at one end and exhaust at the other end. However, the pumping efficiency of this structure is limited, and it is difficult to effectively improve the pumping efficiency. Utility Model Content

[0003] The purpose of this invention is to provide a screw rotor structure 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:

[0005] A screw rotor structure is disposed inside a vacuum pump. The vacuum pump includes a pump housing and a drive motor, and includes two meshing screw rotors. Each screw rotor includes a rotor body and a first blade and a second blade spirally wound around the rotor body. The first blade and the second blade rotate in opposite directions and are mirror images of each other. The first blade and the second blade do not intersect and form an air inlet at the middle position of the two rotor bodies, and form an exhaust end near the two ends of the rotor body.

[0006] Furthermore, the pitch of the first blade gradually decreases from the position near the middle of the rotor body to the position away from the middle of the rotor body, and the thickness also gradually decreases.

[0007] Furthermore, the pump housing has an air inlet at its upper end and two exhaust ports at its lower end. The air inlet is located at a position corresponding to and connected to the air inlet end, and the exhaust ports are located at a position corresponding to and connected to the exhaust end.

[0008] Furthermore, the rotor body has inward recesses at both ends forming cooling chambers, which are coaxially arranged with the rotor body and do not penetrate the rotor body.

[0009] Furthermore, the rotor body is provided with connecting shafts at both ends, the connecting shafts cover the cooling chamber, and the connecting shafts are hollow and communicate with the cooling chamber.

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

[0011] This invention implements a vacuum structure with air intake in the middle and exhaust at both ends, which can greatly improve the air extraction efficiency. At the same time, in conjunction with the blade structure, it enhances the stability and smoothness of operation. 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 the screw rotor structure combined with the vacuum pump structure of Example 1;

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

[0015] Figure 3 for Figure 2 A schematic diagram of a screw rotor;

[0016] Figure 4 for Figure 3 A schematic diagram of the cross-sectional structure. 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 1-4 As shown, the screw rotor structure in this embodiment is installed inside the vacuum pump 1. The vacuum pump 1 includes a pump housing and a drive motor. It mainly includes two meshing screw rotors 10 installed inside the vacuum pump 1, which are driven by the drive motor to rotate and perform vacuuming motion.

[0020] Specifically, the screw rotor 10 includes a rotor body 11 and a first blade 12 and a second blade 13 spirally wound around the rotor body 11. The first blade 12 and the second blade 13 rotate in opposite directions and are mirror images of each other. The first blade 12 and the second blade 13 do not intersect and form an air inlet 101 at the middle position of the two rotor bodies 11. An exhaust end 102 is formed near both ends of the rotor body 11. Correspondingly, an air inlet 110 is provided at the upper end of the pump housing, and two exhaust ports 120 are provided at the lower end of the pump housing. The position of the air inlet 110 corresponds to and is connected to the position of the air inlet 101, and the position of the exhaust port 120 corresponds to and is connected to the position of the exhaust end 102. The two exhaust ends 102 are connected by a pipeline for unified exhaust.

[0021] This achieves a structure with air intake in the middle and exhaust at both ends.

[0022] The pitch of the first blade 12 gradually decreases from the middle position near the rotor body 11 to the position away from the middle position of the rotor body 11, and the thickness also gradually decreases. This structure effectively guides the gas to be discharged smoothly and stably, while providing sufficient strength at the air inlet.

[0023] Furthermore, both ends of the rotor body 11 have inward recesses forming cooling chambers 111. The cooling chambers 111 are coaxially arranged with the rotor body 11 and do not penetrate the rotor body 11. The cooling chambers 111 are used to introduce a cooling medium such as cooling oil.

[0024] Furthermore, connecting shafts 14 are provided at both ends of the rotor body 11. The connecting shafts 14 cover the cooling chamber 111. The connecting shafts 14 are hollow and communicate with the cooling chamber 111. The cooling medium is input through the connecting shafts 14.

[0025] 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 screw rotor structure, disposed within a vacuum pump, the vacuum pump comprising a pump housing and a drive motor, characterized in that, It includes two meshing screw rotors. The screw rotors include a rotor body and a first blade and a second blade spirally wound on the rotor body. The first blade and the second blade rotate in opposite directions and are arranged in a mirror image. The first blade and the second blade do not intersect and form an air intake end at the middle position of the two rotor bodies, and form an exhaust end near the two ends of the rotor bodies.

2. The screw rotor structure according to claim 1, characterized in that: The pitch of the first blade gradually decreases from the position near the middle of the rotor body to the position away from the middle of the rotor body, and the thickness also gradually decreases.

3. The screw rotor structure according to claim 2, characterized in that: The pump housing has an air inlet at the upper end and two exhaust ports at the lower end. The air inlet is located at a position corresponding to and connected to the air inlet end, and the exhaust ports are located at a position corresponding to and connected to the exhaust end.

4. The screw rotor structure according to claim 3, characterized in that: The rotor body has inward recesses at both ends to form cooling chambers, which are coaxially arranged with the rotor body and do not penetrate the rotor body.

5. A screw rotor structure according to claim 3, characterized in that: The rotor body is provided with connecting shafts at both ends, the connecting shafts cover the cooling chamber, the connecting shafts are hollow and communicate with the cooling chamber.

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