Shaft sealing structure of vacuum pump core

Abstract

The utility model belongs to the technical field of pump cores, and relates to a shaft sealing structure of a vacuum pump core. The pump comprises a pump body, a pump cover and a rotor piece which is sleeved in the pump body and is in running fit with the pump body. In the using process, the coupler is connected with a motor, the high-abrasion-resistance shaft sleeve piece is arranged on the rotor shaft in a sleeved mode, the high-abrasion-resistance shaft sleeve piece rotates along with the rotor shaft, the gap space between the oil pump cover and the high-abrasion-resistance shaft sleeve piece is filled with the shaft oil seal structure, and the high-abrasion-resistance shaft sleeve piece is provided with a carburizing coating, so that the hardness is higher; the rotor shaft is not prone to being abraded, abrasion resistance is improved, sealing is conducted between the rotor shaft and the high-abrasion-resistance shaft sleeve through the sealing part, sealing can be ensured by replacing the high-abrasion-resistance shaft sleeve subsequently, a traditional oil seal is replaced with a shaft oil seal structure, combined sealing of the shaft seal and the oil seal is adopted, the sealing effect is ensured, and the oil leakage rate is reduced.

Description

Technical Field

[0001] The utility model belongs to the technical field of pump cores and relates to a shaft sealing structure of a vacuum pump core. Background Art

[0002] The pump core is the core component of a pump, typically consisting of a shaft and rotor. It is the primary component for generating fluid power. Positioned between the pump body and the motor, the pump core is the pump's power source, converting mechanical energy into fluid energy. The pump core plays a crucial role in the pump's operation, generating dynamic effects such as flow rate, head, and pressure depending on the properties of the liquid and the operating conditions. The quality of the pump core directly impacts the pump's efficiency and stability. Currently, most pump cores on the market use an oil seal between the rotor shaft and the oil pump cover. This seal is susceptible to wear over time, leading to oil leaks and poor sealing and wear resistance.

[0003] To overcome the shortcomings of the existing technology, researchers have continuously explored and proposed various solutions. For example, a Chinese patent application discloses an inner cover rotor oil pump [Application No.: 201010191796.5], which includes a pump cover 1, a pump body 2 integrally cast and connected to a front end cover, an outer rotor 3, an inner rotor 4, a screw plug 5, a spring 6, and a plunger valve 7. The plunger valve 7, spring 6, and screw plug 5 are mounted within a pressure-limiting valve hole 101. An oil inlet 100 and an oil inlet chamber 102 are located at the lower left of the rotor hole 108; an oil outlet chamber 107, an oil outlet hole 105, and an oil outlet hole 104 are located at the upper left. The pressure-limiting valve hole 101 communicates with the oil outlet chamber 107 via a valve bottom oil hole 106. A pair of flat squares provided in the hole of the inner rotor 4 provide transmission for the oil pump. However, this solution suffers from poor sealing and wear resistance, as the oil seal and rotor shaft are still susceptible to wear during use, leading to oil leakage. Summary of the Invention

[0004] The purpose of the utility model is to provide a shaft sealing structure for a vacuum pump core in view of the above problems.

[0005] In order to achieve the above purpose, the utility model adopts the following technical solutions:

[0006] The cam is secured to the pump body by a spring which is secured to the cam face by a spring which is secured to the cam face by a spring which is secured to the cam face by a spring which is secured to the cam face by a spring which is secured to the cam face by a spring which is secured to the cam face by a spring

[0007] In the shaft sealing structure of the above-mentioned vacuum pump core, the high-wear-resistant shaft kit includes a rotor sleeve, the inner and outer sides of the rotor sleeve have carburized coatings, and the inner wall surface of the rotor sleeve abuts against the circumferential outer side of the rotor shaft and the outer side of the sealing part.

[0008] In the shaft sealing structure of the above-mentioned vacuum pump core, the outer circle of the rotor shaft has a sleeve step, one end of the rotor sleeve abuts against the sleeve step, and the other end abuts against the tail of the coupling, and both ends of the rotor sleeve have chamfered portions.

[0009] In the shaft sealing structure of the above-mentioned vacuum pump core, the sealing part includes a plurality of mold rings sleeved on the rotor shaft, and the outer circle of the rotor shaft is provided with a plurality of annular grooves. The mold rings are embedded in the annular grooves and the cross-sectional diameter of the mold rings is the same as the depth of the annular grooves.

[0010] In the shaft sealing structure of the above-mentioned vacuum pump core, the shaft oil seal structure includes a PTFE stainless steel shaft seal and an oil seal. The inner wall surfaces of the PTFE stainless steel shaft seal and the oil seal are respectively rotatably matched with the circumferential outer side of the rotor sleeve, and the circumferential outer sides of the PTFE stainless steel shaft seal and the oil seal are respectively against the oil pump cover.

[0011] In the shaft sealing structure of the above vacuum pump core, the outer ring of the tetrafluorostainless steel shaft seal is made of stainless steel material, and the inner ring is made of polytetrafluoroethylene material.

[0012] In the shaft sealing structure of the vacuum pump core, the oil pump cover is provided with a shaft sealing step and an oil sealing step. The tail end of the outer ring of the PTFE shaft seal abuts against the shaft sealing step, and the tail end of the outer ring of the oil seal abuts against the oil sealing step.

[0013] In the shaft sealing structure of the vacuum pump core, the rotor member includes a first rotor and a second rotor. The second rotor is integrally formed with the rotor shaft, and a connecting sleeve is sleeved between the first rotor and the second rotor.

[0014] In the shaft sealing structure of the above-mentioned vacuum pump core, the pump body includes a first pump body and a second pump body, the first rotor is rotationally connected to the first pump body, and the second rotor is rotationally connected to the second pump body.

[0015] In the shaft sealing structure of the above-mentioned vacuum pump core, the connection structure includes a washer and a fixing screw. The washer abuts against the coupling, and the fixing screw passes through the washer and is screwed and fixed to the rotor shaft center.

[0016] Compared with the existing technology, the advantages of this utility model are:

[0017] 1. During use of the utility model, the coupling is connected to the motor, and the high-wear-resistant shaft kit is sleeved on the rotor shaft. The high-wear-resistant shaft kit rotates with the rotor shaft. The shaft oil seal structure fills the gap space between the oil pump cover and the high-wear-resistant shaft kit. The high-wear-resistant shaft kit has a carburized coating with higher hardness, which makes the rotor shaft less likely to wear and improves wear resistance. The rotor shaft and the high-wear-resistant shaft kit are sealed by the sealing part. The sealing can be ensured later by replacing the high-wear-resistant shaft kit, replacing the traditional oil seal with a shaft oil seal structure, and adopting a combined seal of shaft seal and oil seal to ensure the sealing effect and reduce the oil leakage rate.

[0018] 2. The outer ring of the PTFE shaft seal in this utility model is made of stainless steel, which is wear-resistant and has a long service life. The inner ring is made of polytetrafluoroethylene, also known as polytetrafluoroethylene, which has excellent chemical stability, corrosion resistance, sealing, high lubrication and non-stick properties, electrical insulation and good anti-aging endurance, and can be used for a long time in the temperature range of -180℃ to 260℃.

[0019] Other advantages, objectives and features of the present invention will be reflected in part through the following description, and in part will be understood by those skilled in the art through research and practice of the present invention. BRIEF DESCRIPTION OF THE DRAWINGS

[0020] Figure 1 It is a structural diagram of the present utility model.

[0021] Figure 2 It is a cross-sectional schematic diagram of the present utility model.

[0022] Figure 3 yes Figure 2 Enlarged schematic diagram of point A in the middle.

[0023] Figure 4 It is a partial structural diagram of the utility model.

[0024] Figure 5 This is a diagram showing the connection between the rotor sleeve and the rotor shaft 3a.

[0025] Figure 6This is the assembly diagram between the second rotor and the O-ring.

[0026] Figure 7 It is a structural diagram of the oil pump cover.

[0027] In the figure: pump body 1, first pump body 1a, second pump body 1b, pump cover 2, rotor part 3, rotor shaft 3a, sleeve step 3a1, annular groove 3a2, first rotor 3b, second rotor 3c, connecting sleeve 3d, coupling 4, oil pump cover 5, shaft seal step 5a, oil seal step 5b, annular placement space 6, high wear-resistant shaft kit 7, rotor sleeve 7a, chamfered part 7a1, shaft oil seal structure 8, PTFE stainless steel shaft seal 8a, oil seal 8b, sealing part 9, O-ring 9a, gasket 10, fixing screw 11. DETAILED DESCRIPTION

[0028] The present invention will be further described below with reference to the accompanying drawings.

[0029] like Figure 1-7 As shown, a shaft sealing structure of a vacuum pump core includes a pump body 1, a pump cover 2, and a rotor member 3 sleeved in the pump body 1 and rotatably matched with the pump body 1. The rotor shaft 3a at the head of the rotor member 3 is equipped with a coupling 4. The coupling 4 and the rotor shaft 3a are fixed by a connecting structure. An oil pump cover 5 is sleeved between the tail of the coupling 4 and the pump body 1. The rotor shaft 3a at the head of the rotor member 3 passes through the oil pump cover 5, and an annular arrangement is formed between the oil pump cover 5 and the rotor shaft 3a. Space 6. A detachable high-wear-resistant shaft kit 7 and a shaft oil seal structure 8 are installed in the annular placement space 6. The inner wall surface of the high-wear-resistant shaft kit 7 is in contact with the circumferential outer side of the rotor shaft 3a, and the outer wall surface is rotatably matched with the inner wall surface of the shaft oil seal structure 8. A sealing portion 9 is provided between the rotor shafts 3a and the rotor shafts 3a. The circumferential outer side of the shaft oil seal structure 8 is in contact with the inner wall surface of the oil pump cover 5. When the rotor shaft 3a rotates, the shaft oil seal structure 8 remains stationary, and the high-wear-resistant shaft kit 7 rotates synchronously with the rotor shaft 3a.

[0030] In this embodiment, during use, the coupling 4 is connected to the motor, and the high-wear-resistant shaft kit 7 is sleeved on the rotor shaft 3a. The high-wear-resistant shaft kit 7 rotates with the rotor shaft 3a. The shaft oil seal structure 8 fills the gap space between the oil pump cover 5 and the high-wear-resistant shaft kit 7. The high-wear-resistant shaft kit 7 has a carburized coating with higher hardness, which makes the rotor shaft 3a less likely to be worn and improves wear resistance. The rotor shaft 3a and the high-wear-resistant shaft kit 7 are sealed by the sealing part 9. The sealing can be ensured later by replacing the high-wear-resistant shaft kit 7, and the traditional oil seal is replaced with the shaft oil seal structure 8. A combined seal of shaft seal and oil seal is adopted to ensure the sealing effect and reduce the oil leakage rate.

[0031] Combine Figure 1-7As shown, the high wear-resistant shaft kit 7 includes a rotor sleeve 7a, the inner and outer sides of the rotor sleeve 7a have carburized coatings, and the inner wall surface of the rotor sleeve 7a abuts against the circumferential outer side of the rotor shaft 3a and the outer side of the sealing part 9.

[0032] Specifically, the inner and outer sides of the rotor sleeve 7a are provided with a carburized coating. The carburized coating has high hardness and good wear resistance, which makes the rotor shaft 3a not easily worn and improves the wear resistance. Those skilled in the art should understand that carburizing is a metal surface treatment process, which is mainly used for low carbon steel or low alloy steel. The process includes placing the rotor sleeve 7a in a furnace with an active carburizing medium, heating it to 900-950 degrees Celsius, and keeping it warm for a period of time to allow carbon atoms to penetrate into the surface of the steel part, so that the rotor sleeve 7a has a carburized coating.

[0033] Combine Figure 2 、 Figure 5 As shown, the rotor shaft 3a has a sleeve step 3a1 on its outer circumference, one end of the rotor sleeve 7a abuts against the sleeve step 3a1, and the other end abuts against the tail of the coupling 4, and both ends of the rotor sleeve 7a have chamfered portions 7a1.

[0034] In this embodiment, during the installation process, one end of the rotor sleeve 7a abuts against the sleeve step 3a1, and the other end abuts against the tail of the coupling 4, thereby achieving axial fixation at both ends. The chamfered portion 7a1 serves to prevent damage, reduce wear, improve assembly efficiency, and improve fluid dynamics.

[0035] The sealing portion 9 includes a plurality of O-rings 9a sleeved on the rotor shaft 3a. The outer circumference of the rotor shaft 3a is provided with a plurality of annular grooves 3a2. The O-rings 9a are embedded in the annular grooves 3a2 and the cross-sectional diameter of the O-rings 9a is the same as the depth of the annular grooves 3a2.

[0036] In this embodiment, the annular groove 3a2 is used to install and fix the O-ring 9a. The O-ring 9a is embedded in the annular groove 3a2 to seal between the rotor shaft 3a and the rotor sleeve 7a.

[0037] Combine Figure 2 As shown, the shaft oil seal structure 8 includes a PTFE stainless steel shaft seal 8a and an oil seal 8b. The inner wall surfaces of the PTFE stainless steel shaft seal 8a and the oil seal 8b are respectively rotatably matched with the circumferential outer side of the rotor sleeve 7a, and the circumferential outer sides of the PTFE stainless steel shaft seal 8a and the oil seal 8b are respectively against the oil pump cover 5.

[0038] In this embodiment, the polytetrafluoroethylene stainless steel shaft seal 8a and the oil seal 8b fill the gap space between the oil pump cover 5 and the high-wear-resistant shaft kit 7, and the traditional oil seal is replaced by a combination of the polytetrafluoroethylene stainless steel shaft seal 8a and the oil seal 8b. A combined seal of the shaft seal and the oil seal is adopted to ensure the sealing effect and reduce the oil leakage rate.

[0039] The outer ring of the tetrafluorostainless steel shaft seal 8a is made of stainless steel, and the inner ring is made of polytetrafluoroethylene.

[0040] In this embodiment, the outer ring of the tetrafluorostainless steel shaft seal 8a is made of stainless steel, which is wear-resistant and has a long service life. The inner ring is made of polytetrafluoroethylene. Polytetrafluoroethylene is also called PTFE. It has excellent chemical stability, corrosion resistance, sealing, high lubricity and non-stickiness, electrical insulation and good anti-aging resistance, and can be used for a long time in the temperature range of -180°C to 260°C.

[0041] The oil pump cover 5 has a shaft seal step 5a and an oil seal step 5b therein. The outer ring tail end of the PTFE stainless steel shaft seal 8a abuts against the shaft seal step 5a, and the outer ring tail end of the oil seal 8b abuts against the oil seal step 5b.

[0042] In this embodiment, during the installation process, the outer ring tail end of the PTFE stainless steel shaft seal 8a abuts against the shaft seal step 5a to position and fix the PTFE stainless steel shaft seal 8a, and the outer ring tail end of the oil seal 8b abuts against the oil seal step 5b to position and fix the oil seal 8b.

[0043] Combine Figure 2 As shown, the rotor component 3 includes a first rotor 3b and a second rotor 3c, the second rotor 3c is integrally formed with the rotor shaft 3a, and a connecting shaft sleeve 3d is provided between the first rotor 3b and the second rotor 3c. The pump body 1 includes a first pump body 1a and a second pump body 1b, the first rotor 3b is rotationally connected to the first pump body 1a, and the second rotor 3c is rotationally connected to the second pump body 1b.

[0044] In this embodiment, the connecting sleeve 3d is used to connect the first rotor 3b and the second rotor 3c. A sleeve is also installed between the first rotor 3b and the pump cover 2. The first pump body 1a and the second pump body 1b are used to install the first rotor 3b and the second rotor 3c.

[0045] Combine Figure 1-4 As shown, the connection structure includes a washer 10 and a fixing screw 11. The washer 10 abuts against the coupling 4. The fixing screw 11 passes through the washer 10 and is screwed and fixed to the axis of the rotor shaft 3a.

[0046] In this embodiment, the coupling 4 and the rotor shaft 3a are fixed by a washer 10 and a fixing screw 11, and a detachable structure is adopted to facilitate subsequent disassembly, assembly, maintenance and replacement.

[0047] The working principle of this utility model is:

[0048] During use, the coupling 4 is connected to the motor, and the rotor sleeve 7a is sleeved on the rotor shaft 3a. The rotor sleeve 7a rotates with the rotor shaft 3a. The PTFE stainless steel shaft seal 8a and the oil seal 8b fill the gap between the oil pump cover 5 and the rotor sleeve 7a. The rotor sleeve 7a has a carburized coating with higher hardness, which makes the rotor shaft 3a less likely to be worn and improves wear resistance. The annular groove 3a2 is used to install and fix the O-ring 9a. The O-ring 9a is embedded in the annular groove 3a2 to seal the rotor shaft 3a and the rotor sleeve 7a. The sealing can be ensured by replacing the rotor sleeve 7a later. The traditional oil seal is replaced with a combination of PTFE stainless steel shaft seal 8a and oil seal 8b. The combined seal of the shaft seal and oil seal is adopted to ensure the sealing effect and reduce the oil leakage rate.

[0049] The rotor sleeve 7a has a carburized coating on its inner and outer sides. The carburized coating has high hardness and good wear resistance, making the rotor shaft 3a less susceptible to wear and improving wear resistance. Those skilled in the art should understand that carburizing is a metal surface treatment process mainly used for low-carbon steel or low-alloy steel. The process includes placing the rotor sleeve 7a in a furnace with an active carburizing medium, heating it to 900-950 degrees Celsius, and keeping it warm for a period of time to allow carbon atoms to penetrate the surface of the steel part, so that the rotor sleeve 7a has a carburized coating.

[0050] During the installation process, one end of the rotor sleeve 7a abuts against the sleeve step 3a1, and the other end abuts against the tail of the coupling 4 to achieve axial fixation at both ends. The chamfered portion 7a1 prevents damage, reduces wear, improves assembly efficiency, and improves fluid dynamics. The tail end of the outer ring of the PTFE stainless steel shaft seal 8a abuts against the shaft seal step 5a to position and fix the PTFE stainless steel shaft seal 8a. The tail end of the outer ring of the oil seal 8b abuts against the oil seal step 5b to position and fix the oil seal 8b.

[0051] The outer ring of the PTFE shaft seal 8a is made of stainless steel, which is wear-resistant and has a long service life. The inner ring is made of polytetrafluoroethylene. Polytetrafluoroethylene is also called PTFE. It has excellent chemical stability, corrosion resistance, sealing, high lubrication and non-stick properties, electrical insulation and good anti-aging resistance. It can be used for a long time in the temperature range of -180℃ to 260℃.

[0052] The connecting sleeve 3d is used to connect the first rotor 3b and the second rotor 3c. A sleeve is also installed between the first rotor 3b and the pump cover 2. The first pump body 1a and the second pump body 1b are used to install the first rotor 3b and the second rotor 3c. The coupling 4 and the rotor shaft 3a are fixed by a washer 10 and a fixing screw 11. A detachable structure is adopted to facilitate subsequent disassembly, assembly, maintenance and replacement.

[0053] The specific embodiments described herein are merely examples of the spirit of the present invention. Those skilled in the art may make various modifications or additions to the specific embodiments described, or replace them with similar methods, without departing from the spirit of the present invention.

[0054] Although the present invention generally uses the terms pump body 1, first pump body 1a, second pump body 1b, pump cover 2, rotor member 3, rotor shaft 3a, sleeve step 3a1, annular groove 3a2, first rotor 3b, second rotor 3c, connecting sleeve 3d, coupling 4, oil pump cover 5, shaft seal step 5a, oil seal step 5b, annular placement space 6, high wear-resistant shaft kit 7, rotor sleeve 7a, chamfered portion 7a1, shaft oil seal structure 8, PTFE stainless steel shaft seal 8a, oil seal 8b, sealing portion 9, O-ring 9a, washer 10, and fixing screw 11, the use of other terms is not excluded. The use of these terms is merely for the purpose of more conveniently describing and explaining the essence of the present invention, and interpreting them as any additional limitation is contrary to the spirit of the present invention.

Claims

1. A shaft sealing structure for a vacuum pump core, comprising a pump body (1), a pump cover (2), and a rotor member (3) sleeved in the pump body (1) and rotatably matched with the pump body (1), a coupling (4) being installed on the rotor shaft (3a) at the head of the rotor member (3), the coupling (4) and the rotor shaft (3a) being fixed by a connecting structure, an oil pump cover (5) being sleeved between the tail of the coupling (4) and the pump body (1), the rotor shaft (3a) at the head of the rotor member (3) passing through the oil pump cover (5), and characterized in that: An annular placement space (6) is formed between the oil pump cover (5) and the rotor shaft (3a). A detachable high-wear-resistant shaft kit (7) and a shaft oil seal structure (8) are installed in the annular placement space (6). The inner wall surface of the high-wear-resistant shaft kit (7) abuts against the outer circumferential surface of the rotor shaft (3a), and the outer wall surface rotates in conjunction with the inner wall surface of the shaft oil seal structure (8). A sealing portion (9) is provided between the rotor shafts (3a). The outer circumferential surface of the shaft oil seal structure (8) abuts against the inner wall surface of the oil pump cover (5). When the rotor shaft (3a) rotates, the shaft oil seal structure (8) remains stationary, and the high-wear-resistant shaft kit (7) rotates synchronously with the rotor shaft (3a).

2. The shaft sealing structure of the vacuum pump core according to claim 1, characterized in that: The high-wear-resistant shaft kit (7) comprises a rotor sleeve (7a), the inner and outer sides of the rotor sleeve (7a) are provided with carburized coatings, and the inner wall surface of the rotor sleeve (7a) abuts against the circumferential outer side of the rotor shaft (3a) and the outer side of the sealing portion (9).

3. The shaft sealing structure of the vacuum pump core according to claim 2, characterized in that: The rotor shaft (3a) has a sleeve step (3a1) on its outer circumference, one end of the rotor sleeve (7a) abuts against the sleeve step (3a1), and the other end abuts against the tail of the coupling (4), and both ends of the rotor sleeve (7a) have chamfered portions (7a1).

4. The shaft sealing structure of the vacuum pump core according to claim 3, characterized in that: The sealing portion (9) comprises a plurality of O-rings (9a) sleeved on the rotor shaft (3a); the outer circumference of the rotor shaft (3a) is provided with a plurality of annular grooves (3a2); the O-rings (9a) are embedded in the annular grooves (3a2); and the cross-sectional diameter of the O-rings (9a) is the same as the depth of the annular grooves (3a2).

5. The shaft sealing structure of the vacuum pump core according to claim 4, characterized in that: The shaft oil seal structure (8) comprises a tetrafluoro stainless steel shaft seal (8a) and an oil seal (8b); the inner wall surfaces of the tetrafluoro stainless steel shaft seal (8a) and the oil seal (8b) are respectively rotatably matched with the circumferential outer side of the rotor shaft sleeve (7a); and the circumferential outer sides of the tetrafluoro stainless steel shaft seal (8a) and the oil seal (8b) are respectively abutted against the oil pump cover (5).

6. The shaft sealing structure of the vacuum pump core according to claim 5, characterized in that: The outer ring of the tetrafluorostainless steel shaft seal (8a) is made of stainless steel, and the inner ring is made of polytetrafluoroethylene.

7. The shaft sealing structure of the vacuum pump core according to any one of claims 5 or 6, characterized in that: The oil pump cover (5) has a shaft seal step (5a) and an oil seal step (5b) therein; the tail end of the outer ring of the tetrafluorostainless steel shaft seal (8a) abuts against the shaft seal step (5a); and the tail end of the outer ring of the oil seal (8b) abuts against the oil seal step (5b).

8. The shaft sealing structure of a vacuum pump core according to any one of claims 1 to 6, characterized in that: The rotor component (3) comprises a first rotor (3b) and a second rotor (3c); the second rotor (3c) is integrally formed with the rotor shaft (3a); and a connecting shaft sleeve (3d) is sleeved between the first rotor (3b) and the second rotor (3c).

9. The shaft sealing structure of the vacuum pump core according to claim 8, characterized in that: The pump body (1) comprises a first pump body (1a) and a second pump body (1b); the first rotor (3b) is rotationally connected to the first pump body (1a); and the second rotor (3c) is rotationally connected to the second pump body (1b).

10. The shaft sealing structure of a vacuum pump core according to any one of claims 1 to 6, characterized in that: The connection structure comprises a washer (10) and a fixing screw (11); the washer (10) abuts against the coupling (4); the fixing screw (11) passes through the washer (10) and is screwed and fixed to the axis of the rotor shaft (3a).

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