Sandwich water-cooled vacuum-sealed rotary transmission shaft structure

Abstract

The application provides a kind of sandwich water-cooled vacuum sealed rotary drive shaft structure, including drive shaft, the drive shaft is the multi-step shaft of gradually reducing towards central axis diameter at two ends;The left end of the drive shaft is equipped with two steps, from left to right, it is first step and second step respectively;The right end of the drive shaft has three steps, from left to right, it is third step, fourth step and fifth step respectively;The step is respectively equipped with bearing, water seal ring and vacuum seal ring;The drive shaft is equipped with shell outside, the shell includes outer shell and inner shell, the inner shell is with the interlayer between the outer shell, the inner shell is equipped with communication part, the communication part communicates the interlayer with the drive shaft;The outer shell is equipped with water inlet and water outlet;This structure is novel and reasonable, can cool down drive shaft, prolong the service life of bearing and seal ring, conducive to the generation of vacuum environment.

Description

Technical Field

[0001] This invention relates to the field of equipment cooling and sealing technology, specifically to a sandwich water-cooled vacuum-sealed rotary transmission shaft structure. Background Technology

[0002] In existing technologies, magnetohydrodynamic (MHD) transmission devices in high-vacuum equipment require prolonged high-temperature baking and degassing at approximately 200-400°C. This high temperature can easily cause residual deformation of the rubber seals, and the transmission shaft also experiences high temperatures, accelerating the aging of the rubber seals. The bearings in existing MHD sealing devices are typically located on both sides of the sealing assembly, inevitably placing a set of bearings between the sealed equipment and the sealing assembly. Because high-vacuum equipment requires prolonged high-temperature baking at approximately 200-400°C, the lubricant inside the bearings in the vacuum environment will evaporate into the vacuum environment, creating oil vapor. This not only affects the cleanliness of the vacuum chamber and the achievement of a vacuum, but also, due to the continuous evaporation of the bearing lubricant, disrupts the bearing's lubrication conditions, shortens its service life, and thus affects the overall performance and service life of the MHD seal.

[0003] In view of this, the inventor conducted in-depth research on the above-mentioned problems, which led to the development of this invention. Summary of the Invention

[0004] The purpose of this invention is to provide a solution that improves heat dissipation and extends the service life of the rubber seals and bearings on the transmission shaft.

[0005] To solve the above problems, the present invention adopts the following technical solution:

[0006] A sandwich-type water-cooled vacuum-sealed rotary transmission shaft structure includes a transmission shaft, which is a stepped shaft with multiple steps at both ends; the left end of the transmission shaft has two steps, namely the first step and the second step from left to right; the right end of the transmission shaft has three steps, namely the third step, the fourth step and the fifth step from left to right; bearings, water seal rings and vacuum seal rings are respectively fitted on the steps; a housing is provided outside the transmission shaft, the housing includes an outer shell and an inner shell, a sandwich layer is provided between the inner shell and the outer shell, the inner shell has a connecting part, the connecting part connects the sandwich layer and the transmission shaft; the outer shell has a water inlet and a water outlet.

[0007] Preferably, the first step has a bearing retaining sleeve, the bearing retaining sleeve is fitted with a left bearing, the second step is fitted with a left water seal ring; the third step is fitted with a right water seal ring, the fourth step is fitted with a right bearing, and the fifth step is fitted with a vacuum seal ring.

[0008] Preferably, a spacer is provided between the left bearing and the left water seal ring.

[0009] Preferably, a bearing retaining ring is provided between the right water seal ring and the right bearing, and a gasket is provided between the right bearing and the vacuum seal ring.

[0010] Preferably, the bearing retaining sleeve is provided with a front cover plate, the front cover plate has several through holes, and the housing is provided with several internal threads at positions corresponding to the front cover plate.

[0011] Preferably, the water inlet and the water outlet are arranged symmetrically.

[0012] By adopting the above technical solution, the beneficial effects of the present invention are:

[0013] The housing adopts a sandwich structure design, and the cooling liquid can wrap around the inner housing and part of the drive shaft. The heat dissipation area reaches more than 95% of the housing. The inner and outer housings are connected, and the cooling circuit is connected to the drive shaft. The cooling liquid can also remove the heat from the shaft end that is deep in the vacuum chamber, thereby protecting the vacuum seal ring and stabilizing its working temperature. The overall heat dissipation structure can quickly and comprehensively remove the heat accumulated by the high temperature baking during vacuuming, thus protecting the normal operation of the rotating parts. Attached Figure Description

[0014] Figure 1 This is a schematic diagram of the overall structure of the present invention;

[0015] Figure 2 This is a partial structural schematic diagram of the drive shaft of the present invention;

[0016] Explanation of reference numerals in the attached figures:

[0017] 1-Drive shaft; 11-First step; 12-Second step; 13-Third step; 14-Fourth step; 15-Fifth step;

[0018] 2-Bearing; 21-Left bearing; 22-Right bearing;

[0019] 3-Water seal ring; 31-Left water seal ring; 32-Right water seal ring;

[0020] 4-Vacuum sealing ring;

[0021] 5-Shell; 51-Outer shell; 52-Inner shell;

[0022] 6-Mezzanine;

[0023] 7-Connecting parts;

[0024] 8-Water injection port;

[0025] 9-Outlet;

[0026] 10 - Front cover. Detailed Implementation

[0027] To make the objectives, technical solutions, and advantages of the embodiments of the invention clearer, the technical solutions in the embodiments of the invention will be clearly and completely described below in conjunction with the embodiments of the invention. Obviously, the described embodiments are only some embodiments of the invention, not all embodiments. Based on the embodiments of the invention, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of the invention.

[0028] This invention provides a sandwiched water-cooled vacuum-sealed rotary transmission shaft structure, including a transmission shaft 1, which is a stepped shaft with multiple steps at both ends; the left end of the transmission shaft 1 has two steps, namely the first step 11 and the second step 12 from left to right; the right end of the transmission shaft 1 has three steps, namely the third step 13, the fourth step 14 and the fifth step 15 from left to right; bearings 2, water seal rings 3 and vacuum seal rings 4 are respectively fitted on the steps; the transmission shaft 1 is provided with a housing 5, which includes an outer shell 51 and an inner shell 52, with a sandwich 6 between the inner shell 52 and the outer shell 51, and the inner shell 52 is provided with a connecting part 7, which connects the sandwich 6 and the transmission shaft 1; the outer shell 51 is provided with a water inlet 8 and a water outlet 9. The first step 11 has a bearing retaining sleeve, and the left bearing 21 is fitted over the bearing retaining sleeve. The second step 12 has a left water seal ring 31 fitted over it. The third step 13 has a right water seal ring 32 fitted over it. The fourth step 14 has a right bearing 22 fitted over it. The fifth step 15 has a vacuum seal ring 4 fitted over it.

[0029] The housing 5 adopts a sandwich structure design, in which the cooling liquid can envelop the inner housing 52 and part of the drive shaft, with a heat dissipation area of ​​more than 95% of the housing. It also connects the inner and outer housings 51, and the cooling circuit is connected to the drive shaft 1. The cooling liquid can also remove the heat from the shaft end that is deep in the vacuum cavity, thereby protecting the working temperature of the vacuum seal ring 4 and stabilizing it. The overall heat dissipation structure can quickly and comprehensively remove the heat generated by the high temperature baking during vacuuming, thereby protecting the normal operation of the rotating parts. It has a good cooling effect and will not cause the seals to age and wear due to the high temperature environment.

[0030] Compared to the magnetohydrodynamic (MHD) sealing structure, the vacuum seal ring 4 at the end of the rotating shaft 1 in this technical solution completely isolates the complex mechanical environment of the transmission part from the vacuum side, completely isolating the grease and water vapor contained in the mechanical environment of the transmission part, reducing the vacuuming time and contamination of the vacuum chamber, while also ensuring the normal operating conditions and service life of the bearing 2 under normal temperature and pressure, solving the problem of shortened bearing service life when exposed to a vacuum environment in MHD structures; since the bearings 2 are all on the atmospheric side, the grease will not volatilize and solidify, extending the service life of the bearing 20, and there is no volatile matter contaminating the vacuum environment; the structure is compact and simple, which can reduce equipment costs and completely realize domestic production without relying on imported components.

[0031] Furthermore, a spacer is provided between the left bearing 21 and the left water seal ring 31; the spacer prevents friction between the left bearing 21 and the left water seal ring 31.

[0032] Furthermore, a bearing retaining ring is provided between the right water seal ring 32 and the right bearing 22, and a gasket is provided between the right bearing 22 and the vacuum seal ring 4 to prevent mutual friction between them.

[0033] Furthermore, a front cover plate 10 is provided outside the bearing retaining sleeve, and several through holes are provided on the front cover plate 10. Several internal threads are provided on the inner housing 52 at the positions corresponding to the through holes on the front cover plate 10. The front cover plate is locked by countersunk bolts to press the left bearing 21.

[0034] Furthermore, the water inlet 8 and water outlet 9 are symmetrically arranged; the structure is compact, which facilitates the injection and discharge of coolant and makes replacement convenient.

[0035] The above embodiments are only used to illustrate the technical solutions of the present invention, and are not intended to limit it. Although the present invention has been described in detail with reference to the foregoing embodiments, those skilled in the art should understand that modifications can still be made to the technical solutions described in the foregoing embodiments, or equivalent substitutions can be made to some of the technical features. Such modifications or substitutions do not cause the essence of the corresponding technical solutions to deviate from the spirit and scope of the technical solutions of the embodiments of the present invention.

Claims

1. A sandwich-type water-cooled vacuum-sealed rotary transmission shaft structure, comprising a transmission shaft, characterized in that: The drive shaft is a stepped shaft with multiple steps at both ends; the left end of the drive shaft has two steps, namely the first step and the second step from left to right; the right end of the drive shaft has three steps, namely the third step, the fourth step, and the fifth step from left to right; bearings, water seal rings, and vacuum seal rings are respectively fitted on the steps; the bearings include a left bearing and a right bearing; the water seal rings include a left water seal ring and a right water seal ring; a bearing locking sleeve is provided on the first step, and the left bearing is fitted on the right side of the bearing locking sleeve; the left water seal ring is fitted on the second step; the right water seal ring is fitted on the third step; the right bearing is fitted on the fourth step; and the vacuum seal ring is fitted on the fifth step; the drive shaft is provided with a housing, which includes an outer shell and an inner shell, with a sandwich between the inner shell and the outer shell, and the inner shell has a connecting part that connects the sandwich and the drive shaft; the outer shell has a water inlet and a water outlet.

2. The sandwich water-cooled vacuum-sealed rotary transmission shaft structure according to claim 1, characterized in that: A spacer is provided between the left bearing and the left water seal ring.

3. The sandwich water-cooled vacuum-sealed rotary transmission shaft structure according to claim 1, characterized in that: A bearing retaining ring is provided between the right water seal ring and the right bearing, and a gasket is provided between the right bearing and the vacuum seal ring.

4. The sandwich water-cooled vacuum-sealed rotary transmission shaft structure according to claim 2, characterized in that: The bearing retaining sleeve is provided with a front cover plate, and the front cover plate has several through holes. The housing is provided with several internal threads at the positions corresponding to the front cover plate.

5. The sandwich water-cooled vacuum-sealed rotary transmission shaft structure according to claim 1, characterized in that: The water inlet and the water outlet are arranged symmetrically.

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