A sealing structure for a dry vacuum pump

Abstract

This utility model discloses a sealing structure for a dry vacuum pump, belonging to the field of vacuum pump sealing technology. It includes a dry vacuum pump chamber with a shaft assembly inside, comprising a shaft rotor installed within the pump chamber. A gear chamber is located on one side of the pump chamber, and a motor chamber on the other. Shaped rubber rings are provided between the gear chamber and the pump chamber, and between the motor chamber and the pump chamber, to fill gaps. Two shaft seals are fitted onto the outer wall of the shaft rotor. This dual sealing structure of shaft seals and shaped rubber rings forms an effective sealing system, effectively sealing between the pump chamber and the gear chamber, the motor chamber, and between the shaft rotor and the gear and motor chambers. Furthermore, a mechanical seal composed of a moving ring plate and a stationary ring plate is employed. This mechanical seal, combined with the shaft seals and shaped rubber rings, significantly improves the overall sealing performance of the dry vacuum pump.

Description

Technical Field

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

[0002] With increasing environmental awareness and technological advancements, dry vacuum pumps are finding wider application in various fields such as pharmaceuticals, food, chemicals, and electronics. Dry vacuum pumps primarily function to draw in and expel gas, creating negative pressure within a connected cavity. There are many types of vacuum pumps, such as positive displacement dry vacuum pumps, which are mainly two-shaft screw pumps. This type has an inlet and an outlet, and the gas is moved from the inlet to the outlet by a pair of rotors rotating synchronously in opposite directions. Dry vacuum pumps are mechanical structures with a wide range of applications. The lifespan of a dry vacuum pump is affected not only by the operating conditions but also by the performance and quality of its sealing structure. The structure of a dry vacuum pump requires perfect sealing between the upper and lower pump chambers, the motor chamber, the gear chamber, and between the rotors to ensure the pump's performance and service life.

[0003] For example, the dry vacuum pump with prior art disclosure number CN217898183U, through its configuration design of double front blade helical blades and single rear blade, can achieve the effects of improving dynamic balance, increasing rotational speed, increasing gas throughput, facilitating processing and forming, and improving mass production efficiency.

[0004] However, existing dry vacuum pumps still have the following problems in use: traditional dry vacuum pumps have poor sealing performance, and the sealing between the shaft rotor and the gear cavity and motor cavity is low, which easily leads to air leakage or oil leakage, seriously affecting the service life of the dry vacuum pump. Therefore, there is an urgent need for a safe, reliable and long-lasting sealing structure for dry vacuum pumps. Utility Model Content

[0005] Therefore, this utility model provides a sealing structure for a dry vacuum pump to solve the problem in the prior art that the dry vacuum pump is prone to air leakage or oil leakage in the pump chamber due to poor sealing performance.

[0006] To achieve the above objectives, this utility model provides the following technical solution: A sealing structure for a dry vacuum pump includes a pump chamber, a shaft assembly inside the pump chamber, and a shaft rotor installed within the pump chamber. A gear chamber is located on one side of the pump chamber, and a motor chamber is located on the other side. Shaped rubber rings for filling gaps are provided between the gear chamber and the pump chamber, and between the motor chamber and the pump chamber. Two shaft seals are fitted onto the outer wall of the shaft rotor, contacting the inner walls of the gear chamber and the motor chamber, respectively. A sealing assembly is provided between the shaft rotor and the gear chamber and the motor chamber.

[0007] Furthermore, the shaft seal is made of stainless steel for the outer surface and polytetrafluoroethylene (PTFE) for the lip. Stainless steel is wear-resistant, while PTFE is corrosion-resistant and high-temperature resistant, which improves the sealing performance and service life of the shaft seal.

[0008] Furthermore, each shaped rubber ring is made of fluororubber, which is a synthetic polymer elastomer containing fluorine atoms on the carbon atoms of the main chain or side chain. It is a high-performance special synthetic rubber with corrosion resistance, aging resistance, high temperature resistance and vacuum performance, enabling the shaped rubber ring to meet the sealing performance requirements of dry vacuum pumps at high temperatures.

[0009] Furthermore, the sealing assembly includes a rotating ring plate, and two rotating ring plates are fitted with stationary ring plates on their outer walls. The two rotating ring plates are fixedly fitted onto the shaft rotor, and the two stationary ring plates are respectively fixed to the inner wall of the gear cavity and the inner wall of the motor cavity.

[0010] Furthermore, annular grooves are provided on the inner walls of both stationary ring plates, and annular sliders are fixed on the outer walls of both moving ring plates. The annular sliders are slidably disposed inside the annular grooves, and the annular sliders cooperate with the annular grooves to play a limiting role between the moving ring plates and the stationary ring plates.

[0011] Furthermore, the annular groove stores lubricating oil, and a sponge ring is fixedly installed inside the annular groove. A gap is formed between the sponge ring and the annular slider, so that the lubricating oil can play a lubricating role between the annular slider and the annular groove, thereby extending the service life of the annular slider.

[0012] Furthermore, two stationary ring plates are provided with circular grooves on opposite sides, and oil outlet pipes are fixedly installed inside the two circular grooves. One end of the oil outlet pipe passes through the stationary ring plate and extends into the interior of the sponge ring. Oil outlets are provided at the bottom of the two oil outlet pipes. Lubricating oil is injected into the annular groove through the oil outlet pipes and oil outlets, so that the lubricating oil plays a lubricating role inside the annular groove.

[0013] Furthermore, both oil outlet pipes are threaded with threaded sealing caps. The two threaded sealing caps have hexagonal grooves machined on the opposite side. The threaded sealing caps are used to seal the oil outlet pipes to prevent lubricating oil from leaking out. At the same time, the hexagonal grooves on the threaded sealing caps make it easy for workers to remove the threaded sealing caps to replenish the fluid.

[0014] This utility model has the following advantages: In this invention, the shaft assembly and the dry vacuum pump chamber form a vacuum chamber. The shaft seal is used to isolate and seal the shaft rotor from the gear chamber and motor chamber. At the same time, the shaped rubber ring is used to seal the dry vacuum pump chamber from the gear chamber and motor chamber. The two together form an effective sealing system. In addition, a mechanical seal composed of a moving ring plate and a stationary ring plate is used between the shaft rotor and the gear chamber and motor chamber. The combination of this mechanical seal with the shaft seal and the shaped rubber ring can significantly improve the overall sealing performance of the dry vacuum pump. Attached Figure Description

[0015] To more clearly illustrate the embodiments of this utility model or the technical solutions in the prior art, the drawings used in the description of the embodiments or the prior art will be briefly introduced below. Obviously, the drawings in the following description are merely exemplary, and those skilled in the art can derive other embodiments based on the provided drawings without creative effort.

[0016] The structures, proportions, sizes, etc. illustrated in this specification are only for the purpose of assisting those skilled in the art in understanding and reading the content disclosed herein, and are not intended to limit the implementation conditions of this utility model. Therefore, they have no substantial technical significance. Any modifications to the structure, changes in the proportions, or adjustments to the size, without affecting the effects and objectives that this utility model can produce, should still fall within the scope of the technical content disclosed in this utility model.

[0017] Figure 1 The unfolded structural diagram provided for this utility model; Figure 2 A cross-sectional view of the pump chamber of the dry vacuum pump provided by this utility model; Figure 3 A schematic diagram of the irregularly shaped rubber ring provided by this utility model; Figure 4 A schematic diagram of the shaft rotor and sealing assembly provided by this utility model; Figure 5 and Figure 6 All are cross-sectional views of the moving ring plate and the stationary ring plate provided by this utility model.

[0018] In the diagram: 1. Dry vacuum pump chamber; 2. Shaft assembly; 21. Shaft rotor; 3. Gear chamber; 4. Motor chamber; 5. Shaped rubber ring; 6. Shaft seal; 7. Sealing assembly; 71. Moving ring plate; 72. Stationary ring plate; 73. Annular groove; 74. Annular slider; 75. Sponge ring; 8. Circular groove; 9. Oil outlet pipe; 10. Oil outlet; 11. Threaded sealing cap; 12. Hexagonal groove. Detailed Implementation

[0019] The following specific embodiments illustrate the implementation of this utility model. Those skilled in the art can easily understand other advantages and effects of this utility model from the content disclosed in this specification. Obviously, the described embodiments are only some, not all, of the embodiments of this utility model. Based on the embodiments of this utility model, all other embodiments obtained by those skilled in the art without creative effort are within the protection scope of this utility model.

[0020] Refer to the instruction manual Figures 1-6 This utility model provides a sealing structure for a dry vacuum pump, including a dry vacuum pump chamber 1. A shaft assembly 2 is provided inside the dry vacuum pump chamber 1. The shaft assembly 2 includes a shaft rotor 21, which is installed inside the dry vacuum pump chamber 1. A gear chamber 3 is provided on one side of the dry vacuum pump chamber 1, and a motor chamber 4 is provided on the other side. A special-shaped rubber ring 5 for filling gaps is provided between the gear chamber 3 and the dry vacuum pump chamber 1, and between the motor chamber 4 and the dry vacuum pump chamber 1. Two shaft seals 6 are fitted on the outer wall of the shaft rotor 21, and the two shaft seals 6 are in contact with the inner wall of the gear chamber 3 and the inner wall of the motor chamber 4, respectively.

[0021] Shaft seal 6 is a friction seal or stuffing box, a sealing device used to prevent leakage. The outer material of shaft seal 6 is stainless steel, which is wear-resistant, while the lip material is polytetrafluoroethylene (PTFE). Shaft seal 6 is made of stainless steel and PTFE, which is corrosion-resistant and high-temperature resistant, thus improving the sealing performance and service life of shaft seal 6. It satisfies both sealing performance and corrosion resistance, thereby enhancing the sealing performance and service life of shaft seal 6. Each shaped rubber ring 5 is made of fluororubber. Fluororubber refers to a synthetic polymer elastomer containing fluorine atoms on the carbon atoms of its main chain or side chains. It is a high-performance special synthetic rubber with corrosion resistance, aging resistance, high-temperature resistance, and vacuum performance, enabling the shaped rubber ring 5 to meet the sealing performance requirements of dry vacuum pumps at high temperatures. Since this is existing technology, it will not be elaborated further here.

[0022] In practical applications, the shaft assembly 2 is mounted on the dry vacuum pump chamber 1. Its shaft rotor 21, together with the dry vacuum pump chamber 1, forms a vacuum chamber. The shaft rotor 21 is isolated from the gear chamber 3 and the motor chamber 4 by a shaft seal 6. This shaft seal 6 is elastic and can tightly fit the outer surface of the shaft rotor 21, thus forming an effective seal between the rotor and the gear chamber 3 and the motor chamber 4. Simultaneously, when the dry vacuum pump chamber 1 is under vacuum, gear oil on the gear chamber 3 side cannot seep into the dry vacuum pump chamber 1 due to the obstruction of the shaft seal 6. Furthermore, the dry vacuum pump chamber 1 is sealed with shaped rubber rings 5 ​​between the gear chamber 3 and the motor chamber 4. These shaped rubber rings 5 ​​are made of fluororubber and possess excellent corrosion resistance, aging resistance, high temperature resistance, and vacuum adaptability, ensuring continuous sealing performance even when the dry vacuum pump temperature rises.

[0023] Refer to the instruction manual Figures 4-6 A sealing assembly 7 is provided between the shaft rotor 21 and the gear cavity 3 and the motor cavity 4. The sealing assembly 7 includes a moving ring plate 71. A stationary ring plate 72 is fitted on the outer wall of each of the two moving ring plates 71. The two moving ring plates 71 are fixedly fitted on the shaft rotor 21. The two stationary ring plates 72 are respectively fixed on the inner wall of the gear cavity 3 and the inner wall of the motor cavity 4. An annular groove 73 is opened on the inner wall of each of the two stationary ring plates 72. An annular slider 74 is fixed on the outer wall of each of the two moving ring plates 71. The annular slider 74 slides inside the annular groove 73. The moving ring plate 71 and the stationary ring plate 72 can be made of stainless steel to improve their wear resistance and service life.

[0024] The annular groove 73 stores lubricating oil inside, and a sponge ring 75 is fixedly installed inside the annular groove 73. A gap is formed between the sponge ring 75 and the annular slider 74 for lubricating oil to lubricate the annular slider 74.

[0025] like Figure 5 As shown, two stationary ring plates 72 each have a circular groove 8 on the side away from each other. An oil outlet pipe 9 is fixedly installed inside each of the two circular grooves 8. One end of the oil outlet pipe 9 passes through the stationary ring plate 72 and extends into the interior of the sponge ring 75. An oil outlet port 10 is opened at the bottom of each of the two oil outlet pipes 9. A threaded sealing cap 11 is threadedly connected to each of the two oil outlet pipes 9. A hexagonal groove 12 is machined on the side away from each other of the two threaded sealing caps 11.

[0026] First, the operator uses a hex wrench to insert into the hexagonal groove 12 of the threaded sealing cap 11, loosens it, and removes it from the circular groove 8. Then, a syringe filled with lubricating oil is inserted into the oil outlet pipe 9, and the piston on the syringe is pushed to inject lubricating oil into the oil outlet pipe 9. The lubricating oil flows into the sponge ring 75 through the oil outlet 10 at the bottom of the oil outlet pipe 9, and is then slowly released from the sponge ring 75 into the annular groove 73, which plays a lubricating role. The sponge ring 75 can slow down the flow rate of the lubricating oil, thereby extending the service life of the lubricating oil. In addition, the cooperation between the moving ring plate 71 and the stationary ring plate 72, combined with the use of the shaft seal 6 and the special-shaped rubber ring 5, can significantly enhance the sealing performance between the shaft rotor 21 and the gear cavity 3 and the motor cavity 4.

[0027] Although the present invention has been described in detail above with general descriptions and specific embodiments, some modifications or improvements can be made to it, which will be obvious to those skilled in the art. Therefore, all such modifications or improvements made without departing from the spirit of the present invention fall within the scope of protection claimed by the present invention.

Claims

1. A dry vacuum pump sealing structure comprising a dry vacuum pump pump chamber (1), characterized in that, The dry vacuum pump chamber (1) is provided with a shaft assembly (2), the shaft assembly (2) includes a shaft rotor (21), and the shaft rotor (21) is installed in the dry vacuum pump chamber (1); The dry vacuum pump chamber (1) has a gear chamber (3) on one side and a motor chamber (4) on the other side. The gear chamber (3) and the dry vacuum pump chamber (1) are provided with shaped rubber rings (5) for filling gaps, and the motor chamber (4) and the dry vacuum pump chamber (1) are provided with two shaft seals (6) on the outer wall of the shaft rotor (21). The two shaft seals (6) are in contact with the inner wall of the gear chamber (3) and the inner wall of the motor chamber (4) respectively. A sealing assembly (7) is provided between the shaft rotor (21) and the gear cavity (3) and the motor cavity (4).

2. The dry vacuum pump seal according to claim 1, wherein The shaft seal (6) is made of stainless steel for the exterior and polytetrafluoroethylene for the lip.

3. The dry vacuum pump seal according to claim 1, wherein, Each irregularly shaped rubber ring (5) is made of fluororubber.

4. The dry vacuum pump seal according to claim 1, wherein, The sealing assembly (7) includes a moving ring plate (71), and two moving ring plates (71) are fitted with stationary ring plates (72) on their outer walls. The two moving ring plates (71) are fixedly fitted on the shaft rotor (21), and the two stationary ring plates (72) are fixed on the inner wall of the gear cavity (3) and the inner wall of the motor cavity (4), respectively.

5. The dry vacuum pump seal according to claim 4, wherein The inner walls of the two stationary ring plates (72) are provided with annular grooves (73), and the outer walls of the two moving ring plates (71) are provided with annular sliders (74), which are slidably disposed inside the annular grooves (73).

6. The dry vacuum pump sealing structure as described in claim 5, characterized in that, The annular groove (73) stores lubricating oil inside, and a sponge ring (75) is fixedly provided inside the annular groove (73). A gap is formed between the sponge ring (75) and the annular slider (74) for lubricating oil to lubricate the annular slider (74).

7. The dry vacuum pump seal according to claim 4, wherein Two stationary ring plates (72) are provided with circular grooves (8) on opposite sides. Oil outlet pipes (9) are fixedly provided inside the two circular grooves (8). One end of the oil outlet pipe (9) passes through the stationary ring plate (72) and extends into the interior of the sponge ring (75). Oil outlet ports (10) are provided at the bottom of the two oil outlet pipes (9).

8. The dry vacuum pump seal according to claim 7, wherein Both oil outlet pipes (9) are threaded with threaded sealing caps (11), and both threaded sealing caps (11) have hexagonal grooves (12) machined on the side furthest from each other.

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