Leakage-proof high-pressure oil pump sealing structure

Abstract

The leakage-proof high-pressure oil pump sealing structure comprises a pump body, and a transmission shaft is installed in the pump body; the transmission sleeve is installed on one side of the pump body, the transmission shaft is partially located in the transmission sleeve, an end cover is arranged on the side, away from the pump body, of the transmission sleeve, and the transmission shaft partially extends out of the end cover. And the movable sealing piece is installed outside the transmission shaft and located in the transmission sleeve, and one end of the movable sealing piece is an extrusion driving face. The movable sealing piece is matched with the inertia driving mechanism, gap adjustment between the transmission shaft and the sealing piece in the working process is achieved, frictional wear is reduced, meanwhile, the sealing state is automatically recovered through the inertia driving mechanism in the shutdown process, the efficient sealing performance of the oil pump in the using process and the non-using process is guaranteed, and the service life is prolonged. Compared with a traditional static sealing structure, the stability of the sealing performance is remarkably improved, and the service life of the sealing structure is remarkably prolonged.

Description

Technical Field

[0001] The present invention relates to the field of oil pumps, and particularly to a leak-proof high-pressure oil pump sealing structure. Background Art

[0002] As an important component widely used in industrial equipment, the sealing performance of a high-pressure oil pump directly affects the operating efficiency and service life of the equipment. In traditional high-pressure oil pump designs, in order to improve the sealing performance, multiple static sealing rings are usually provided in the transmission part, and the transmission shaft is multi-sealed through these sealing rings to prevent oil leakage. However, the traditional sealing structure has the following main problems:

[0003] In the traditional sealing contact method between the sealing ring and the transmission shaft, when the transmission shaft rotates in a circle driven by the driving end, the sealing ring always maintains a sealing contact with the transmission shaft. This continuous frictional contact causes wear and reduced elasticity of the sealing ring material during long-term use. Especially under high-pressure and high-temperature working conditions, the sealing ring is more likely to age;

[0004] Due to the wear and aging of the sealing ring, the sealing performance gradually decreases over time. The traditional sealing ring cannot achieve dynamic adjustment of the sealing state, resulting in its sealing performance becoming worse and worse over time, and ultimately may cause serious oil leakage problems, affecting the normal operation of the oil pump and the safety of the equipment;

[0005] Since the traditional static sealing ring cannot effectively adjust the sealing pressure, its service life is limited by the performance of the sealing material. Frequent maintenance and replacement of the sealing ring not only increase the operating cost of the equipment, but also may lead to an extension of the downtime, affecting the production efficiency.

[0006] In view of the above problems, there is an urgent need in the prior art for a high-pressure oil pump sealing structure that can ensure the sealing performance while extending the service life of the sealing structure and reducing the maintenance frequency. In the prior art, there is a lack of a sealing solution that can dynamically adjust the sealing state to adapt to the change of the working state of the transmission shaft, thus making it difficult to effectively solve the problems of sealing ring wear and rapid attenuation of sealing performance. Summary of the Invention

[0007] To solve the above problems, the present invention provides a leak-proof high-pressure oil pump sealing structure. By adopting a movable seal and an inertial driving mechanism, the gap between the transmission shaft and the seal during operation is adjusted, reducing friction and wear. At the same time, when the machine stops, the inertial driving mechanism automatically restores the sealing state, ensuring high-efficiency sealing performance of the oil pump during use and non-use.

[0008] The present invention is realized through the following technical solutions: A leak-proof high-pressure oil pump sealing structure, comprising:

[0009] A pump body, a transmission shaft is installed inside the pump body, and the transmission shaft is supported and installed inside the pump body by a plurality of bearings;

[0010] A transmission sleeve is installed on one side of the pump body. A part of the transmission shaft is located inside the transmission sleeve. An end cover is provided on the side of the transmission sleeve away from the pump body, and a part of the transmission shaft extends out of the end cover;

[0011] A movable seal, the movable seal is installed outside the transmission shaft and located inside the transmission sleeve. One end of the movable seal is an extrusion driving surface, the other end of the movable seal is a limiting surface, an inner sealing surface is formed on the surface of the movable seal facing the transmission shaft, and an outer sealing surface is formed on the surface of the movable seal facing the transmission sleeve;

[0012] An inertial driving mechanism is installed on one side of the extrusion driving surface of the movable seal. The inertial driving mechanism is fixedly assembled with the transmission shaft and rotates rapidly in a circle following the transmission shaft;

[0013] When the transmission shaft rotates rapidly in a circle, it drives the inertial driving mechanism, and the driving end of the inertial driving mechanism moves away from the extrusion driving surface under the action of inertia force. At this time, the inner sealing surface does not contact the transmission shaft, and the outer sealing surface always seals and contacts the inner wall surface of the transmission sleeve;

[0014] When the transmission shaft stops rotating in a circle, the extrusion driving surface of the movable seal is squeezed by the driving end of the inertial driving mechanism. At this time, the inner sealing surface of the movable seal seals and contacts the transmission shaft, and the outer sealing surface of the movable seal squeezes and seals and contacts the inner wall surface of the transmission sleeve.

[0015] As a preferred technical solution, the movable seal is made of an elastic rubber material with deformation recovery ability. The outer circular surface of the movable seal has a V-shaped annular cavity, and the inner sealing surface is located at the bottommost position of the V-shaped annular cavity.

[0016] As a preferred technical solution, a mounting bush is provided on each of the two end faces of the movable seal. The transmission shaft passes through the mounting bush, and the transmission shaft does not contact the mounting bush.

[0017] As a preferred technical solution, a positioning ring is provided on the limiting surface of the movable seal, and the outer circular surface of the positioning ring is fixedly installed on the inner wall surface of the transmission sleeve.

[0018] As a preferred technical solution, the inertial drive mechanism includes a fixed disk, and an inclined guide bushing is arranged around the outer circumferential surface of the fixed disk for one circle. The guide bushing extends obliquely away from the side of the movable seal. An elastic telescopic connecting rod is arranged in the guide bushing, and the telescopic connecting rod extends away from the side of the movable seal. An extrusion drive rod is arranged on the telescopic connecting rod, and the extrusion drive rod is the drive end of the inertial drive mechanism.

[0019] As a preferred technical solution, a drive roller is arranged on the extrusion drive rod, and the drive roller contacts the extrusion drive surface of the movable seal.

[0020] As a preferred technical solution, a support piston is arranged at one end of the telescopic connecting rod located in the guide bushing. A support spring is sleeved on the telescopic connecting rod at the upper end of the support piston. One end of the support spring contacts and supports the opening end of the guide bushing, and the other end of the support spring contacts and supports the support movably. When the transmission shaft rotates circumferentially, the telescopic connecting rod is thrown out of the guide bushing by inertia and extrudes the support spring.

[0021] As a preferred technical solution, a rotating impeller is arranged at one end of the transmission shaft extending into the pump body, and a connecting flange is also arranged outside the pump body.

[0022] As a preferred technical solution, an outer sealing ring is arranged at the position where the transmission shaft passes through the end cover, and a base is arranged at the bottom of the pump body.

[0023] As a preferred technical solution, two outer sealing surfaces are arranged, which are respectively located on both sides of the movable seal.

[0024] The beneficial effects of the present invention are as follows: When the transmission shaft rotates rapidly in a circle, the inertial drive mechanism generates an appropriate gap between the movable seal and the transmission shaft, reducing the friction and wear between the two, thereby effectively extending the service life of the seal;

[0025] In addition, when the transmission shaft stops rotating, the inertial drive mechanism automatically acts on the extrusion drive surface of the movable seal to ensure that the inner sealing surface is in close contact with the transmission shaft, and the outer sealing surface maintains a stable sealing contact with the inner wall of the transmission sleeve, preventing oil leakage;

[0026] The movable seal is made of an elastic rubber material with deformation recovery ability and is designed with a V-shaped annular cavity, so that it can effectively expand when being extruded, further enhancing the sealing effect. By dynamically adjusting the sealing state, the present invention not only solves the problems of reduced sealing performance and aging of traditional static sealing rings due to long-term use, but also improves the adaptability and reliability of the sealing structure under different working conditions. Description of the Drawings

[0027] In order to more clearly illustrate the technical solutions in the embodiments of the present invention or the prior art, the following will briefly introduce the drawings required for the description of the embodiments or the prior art. Obviously, the drawings in the following description are only some embodiments of the present invention. For those of ordinary skill in the art, without creative efforts, other drawings can also be obtained based on these drawings.

[0028] Figure 1 It is a schematic diagram of the overall structure of the present invention;

[0029] Figure 2 It is a schematic diagram of the internal structure of the present invention;

[0030] Figure 3 It is a cross-sectional view of the interior of the present invention;

[0031] Figure 4 For the present invention Figure 3 A partial enlarged view at position A in;

[0032] Figure 5 It is a schematic diagram of the structure of the movable seal and the inertial drive mechanism of the present invention;

[0033] Explanation of reference numerals:

[0034] 1. Pump body; 5. Transmission shaft; 15. Bearing; 3. Transmission sleeve; 4. End cover; 9. Movable seal; 94. Inner sealing surface; 91. Outer sealing surface; 10. Fixed disk; 12. Guide bushing; 11. Telescopic connecting rod; 13. Extrusion drive rod; 14. Driving roller; 18. Support piston; 17. Support spring; 7. Rotating impeller; 2. Connecting flange; 16. Outer sealing ring; 92. Assembly bushing; 8. Positioning ring; 6. Base; 93. V-shaped annular cavity; 95. Extrusion drive surface. Detailed implementation manners

[0035] All features disclosed in this specification, or all steps in the disclosed methods or processes, except for mutually exclusive features and / or steps, can be combined in any way.

[0036] Any feature disclosed in this specification (including any additional claims, abstract, and drawings), unless specifically stated, can be replaced by other equivalent or similar-purpose alternative features. That is, unless specifically stated, each feature is only an example of a series of equivalent or similar features.

[0037] Such as Figures 1 - 3As shown in the figure, a leak-proof high-pressure oil pump sealing structure of the present invention includes a pump body 1, a transmission shaft 5 is installed in the pump body 1, and the transmission shaft 5 is supported and installed in the pump body 1 by a plurality of bearings 15. In this embodiment, there are two bearings 15, which are respectively arranged on both sides of the transmission shaft 5;

[0038] A transmission sleeve 3 is arranged on one side of the pump body 1. A part of the transmission shaft 5 is located in the transmission sleeve 3. An end cover 4 is arranged on the side of the transmission sleeve 3 away from the pump body 1. A part of the transmission shaft 5 extends out of the end cover 4, and the extended end of the transmission shaft 5 is connected to an external drive motor for driving;

[0039] It further includes a movable seal 9. The movable seal 9 is installed outside the transmission shaft 5 and is located in the transmission sleeve 3. One end of the movable seal 9 is an extrusion driving surface 95, and the other end of the movable seal 9 is a limiting surface. An inner sealing surface 94 is formed on the surface of the movable seal 9 facing the transmission shaft 5, and an outer sealing surface 91 is formed on the surface of the movable seal 9 facing the transmission sleeve 3. When the transmission shaft 5 rotates circumferentially, the inner sealing surface 94 does not contact the transmission shaft 5, while the outer sealing surface 91 always contacts and seals with the inner wall surface of the transmission sleeve 3. Once the transmission shaft 5 stops rotating, the movable seal 9 will be extruded. Due to the structure of the movable seal 9, after the movable seal 9 is extruded, the inner sealing surface 94 will contact and seal with the transmission shaft 5, and the contact force between the outer sealing surface 91 and the inner wall surface of the transmission sleeve 3 is greater, further improving the sealing performance;

[0040] It further includes an inertia driving mechanism, which is installed on one side of the extrusion driving surface 95 of the movable seal 9. The inertia driving mechanism is fixedly assembled with the transmission shaft 5 and rotates rapidly in a circle following the transmission shaft 5. When the transmission shaft 5 rotates circumferentially, the inertia driving mechanism will remove an extrusion thrust on the movable seal 9. At this time, the movable seal 9 will elastically reset, so that a certain gap will be generated between the inner sealing surface 94 and the transmission shaft 5. Therefore, when the oil pump is in use, the transmission shaft 5 will no longer contact the movable seal 9. Therefore, when the transmission shaft 5 rotates, frictional contact with the seal can be avoided, the service life of the movable seal 9 is increased, and at the same time, the structure of the movable seal 9 can ensure the sealing performance during the operation of the oil pump;

[0041] When the transmission shaft 5 rotates rapidly in a circle, it drives the inertia driving mechanism, and makes the driving end of the inertia driving mechanism move away from the extrusion driving surface 95 under the action of inertia force. At this time, the inner sealing surface 94 does not contact the transmission shaft 5, and the outer sealing surface 91 always seals and contacts with the inner wall surface of the transmission sleeve 3;

[0042] When the transmission shaft 5 stops rotating circumferentially, the extrusion driving surface 95 of the movable seal 9 is extruded by the driving end of the inertia driving mechanism. At this time, the inner sealing surface 94 of the movable seal 9 is in sealing contact with the transmission shaft 5, and the outer sealing surface 91 of the movable seal 9 is in extrusion sealing contact with the inner wall surface of the transmission sleeve 3.

[0043] The movable seal 9 is made of an elastic rubber material with deformation recovery ability. The outer circular surface of the movable seal 9 has a V-shaped annular cavity 93. The inner sealing surface 94 is located at the bottommost position of the V-shaped annular cavity 93. Due to the setting of a V-shaped annular cavity 93 in the middle of the movable seal 9, affected by the characteristics of the V-shaped annular cavity 93, when the movable seal 9 is extruded, the V-shaped annular cavity 93 is compressed, and the depth of the V-shaped annular cavity 93 increases under compression, thereby enabling the inner sealing surface 94 to contact the transmission shaft 5 to achieve the purpose of sealing. And due to the compression, the outer diameter of the outer sealing surface 91 of the entire annular seal will also expand, further improving the sealing performance between the annular seal and the inner wall surface of the transmission sleeve 3. Once the transmission shaft 5 starts to work and rotates circumferentially, the driving end of the inertia driving mechanism moves away from the movable seal 9 by inertia force. At this time, the movable seal 9 is no longer extruded and can be reset under the elastic force, the V-shaped annular cavity 93 is reset, and a gap is generated between the inner sealing surface 94 and the transmission shaft 5, thereby reducing the contact time between the transmission shaft 5 and the movable seal 9 during operation.

[0044] Due to the structure of the V-shaped annular cavity 93, inclined rising surfaces are respectively formed at both ends of the inner cavity of the movable seal 9. Even if a small amount of oil penetrates into the movable seal 9 through the gap, it will not flow outwards across the rising surface, effectively achieving the purpose of stopping the flow. As Figure 3 shown, drain holes can be provided on the movable seal 9 to drain part of the oil that enters the movable seal 9.

[0045] Wherein, an assembly bushing 92 is respectively arranged on both end faces of the movable seal 9. The transmission shaft 5 passes through the assembly bushing 92, and the transmission shaft 5 does not contact the assembly bushing 92.

[0046] In order to enable the inertia driving mechanism to extrude the movable seal 9, a positioning ring 8 is arranged on the limiting surface of the movable seal 9. The outer circular surface of the positioning ring 8 is fixedly installed on the inner wall surface of the transmission sleeve 3. When the inertia driving mechanism drives and extrudes the movable seal 9, the other end can be limited by the positioning ring 8, causing the movable seal 9 to deform.

[0047] As Figure 4 and Figure 5As shown in the figure, the inertial drive mechanism includes a fixed disk 10. An inclined guide bushing 12 is arranged around the outer circumferential surface of the fixed disk 10 in a circle. The guide bushing 12 extends obliquely away from the side of the movable seal 9. An elastic telescopic connecting rod 11 is arranged in the guide bushing 12. The telescopic connecting rod 11 extends away from the side of the movable seal 9. An extrusion drive rod 13 is arranged on the telescopic connecting rod 11. The extrusion drive rod 13 is the drive end of the inertial drive mechanism. A drive roller 14 is arranged on the extrusion drive rod 13. The drive roller 14 contacts the extrusion drive surface 95 of the movable seal 9. When the drive shaft rotates circumferentially, the inertial force will throw out the telescopic connecting rod 11. Since the telescopic connecting rod 11 and the guide bushing 12 extend obliquely away from the movable seal 9, after the telescopic connecting rod 11 is thrown out, the drive end can be separated from the extrusion drive surface 95 of the movable seal 9. The movable seal 9 can be reset under the elastic action, and the depth of the V-shaped annular cavity 93 is reduced, so that a gap can be generated between the movable seal 9 and the transmission shaft 5.

[0048] More specifically, a support piston 18 is arranged at one end of the telescopic connecting rod 11 located in the guide bushing 12. A support spring 17 is sleeved on the telescopic connecting rod 11 above the support piston 18. One end of the support spring 17 contacts and supports the open end of the guide bushing 12, and the other end of the support spring 17 contacts and supports the support movably. When the transmission shaft 5 rotates circumferentially, the telescopic connecting rod 11 is thrown out of the guide bushing 12 by inertia and compresses the support spring 17. The support spring 17 is used to reset the telescopic connecting rod 11. When the transmission shaft 5 stops rotating circumferentially, the support spring 17 is used to reset the telescopic connecting rod 11 and the extrusion drive rod 13, so that the extrusion drive rod 13 contacts the extrusion drive surface 95 again, achieving the purpose of extruding the movable seal 9.

[0049] Among them, a rotating impeller 7 is arranged at one end of the transmission shaft 5 extending into the pump body 1. A connecting flange 2 is also arranged outside the pump body 1. An outer sealing ring 16 is arranged at the position where the transmission shaft 5 passes through the end cover 4. A base 6 is arranged at the bottom of the pump body 1. In this embodiment, the outer sealing surface 91 is arranged in two, which are respectively located on both sides of the movable seal 9.

[0050] When the transmission shaft 5 rotates rapidly in a circle in the present invention, the inertial drive mechanism generates an appropriate gap between the movable seal 9 and the transmission shaft 5, reducing the friction and wear between the two, thereby effectively extending the service life of the seal;

[0051] In addition, when the transmission shaft 5 stops rotating, the inertial drive mechanism automatically acts on the extrusion drive surface 95 of the movable seal 9 to ensure that the inner sealing surface 94 is in close contact with the transmission shaft 5, and the outer sealing surface 91 maintains a stable sealing contact with the inner wall of the transmission sleeve 3, preventing oil leakage;

[0052] The movable seal 9 is made of an elastic rubber material with the ability to recover from deformation, and is designed with a V-shaped annular cavity 93 so that it can effectively expand when being extruded, further enhancing the sealing effect. By dynamically adjusting the sealing state, the present invention not only solves the problems of the traditional static sealing ring such as the decline in sealing performance and aging due to long-term use, but also improves the adaptability and reliability of the sealing structure under different working conditions.

[0053] As described above, it is only the specific implementation manner of the present invention, but the protection scope of the present invention is not limited thereto. Any change or substitution that can be thought of without creative work should be covered within the protection scope of the present invention. Therefore, the protection scope of the present invention should be subject to the protection scope defined by the claims.

Claims

1. A leakproof high-pressure oil pump sealing structure, characterized in that: include: A pump body (1), wherein a transmission shaft (5) is installed in the pump body (1), and the transmission shaft (5) is supported and installed in the pump body (1) via a plurality of bearings (15); A transmission sleeve (3) is mounted on one side of the pump body (1), the transmission shaft (5) is partially located inside the transmission sleeve (3), an end cover (4) is provided on the side of the transmission sleeve (3) away from the pump body (1), and the transmission shaft (5) partially extends out of the end cover (4); A movable seal (9), the movable seal (9) being mounted on the outside of the transmission shaft (5) and located inside the transmission sleeve (3), one end of the movable seal (9) being an extrusion drive surface (95), the other end of the movable seal (9) being a limit surface, the movable seal (9) forming an inner sealing surface (94) on one side facing the transmission shaft (5), and forming an outer sealing surface (91) on one side facing the transmission sleeve (3); An inertial drive mechanism is mounted on one side of the extrusion drive surface (95) of the movable seal (9), the inertial drive mechanism being fixedly assembled with the transmission shaft (5) and following the transmission shaft (5) to make rapid circular rotation; When the transmission shaft (5) rotates rapidly in a circular motion, the inertial drive mechanism is driven, and the driving end of the inertial drive mechanism moves away from the extrusion drive surface (95) under the action of the inertial force. At this time, the inner sealing surface (94) does not contact the transmission shaft (5), and the outer sealing surface (91) is always in sealing contact with the inner wall surface of the transmission sleeve (3); When the transmission shaft (5) stops its circular rotation, the extrusion drive surface (95) of the movable seal (9) is squeezed by the driving end of the inertial drive mechanism. At this time, the inner sealing surface (94) of the movable seal (9) is in sealing contact with the transmission shaft (5), and the outer sealing surface (91) of the movable seal (9) is in extrusion sealing contact with the inner wall surface of the transmission sleeve (3).

2. The leakproof high-pressure oil pump sealing structure according to claim 1, characterized in that: The movable seal (9) is made of an elastic rubber material with deformation recovery capability. The outer circumferential surface of the movable seal (9) is provided with a V-shaped annular cavity (93). The inner sealing surface (94) is located at the bottom of the V-shaped annular cavity (93).

3. The leakproof high-pressure oil pump sealing structure according to claim 2, characterized in that: An assembly sleeve (92) is respectively arranged on both side end surfaces of the movable seal (9), and the transmission shaft (5) passes through the assembly sleeve (92), and the transmission shaft (5) does not contact the assembly sleeve (92).

4. The leakproof high-pressure oil pump sealing structure according to claim 1, characterized in that: A positioning ring (8) is provided on the limiting surface of the movable sealing member (9), and the outer circumferential surface of the positioning ring (8) is fixedly mounted on the inner wall surface of the transmission sleeve (3).

5. The leakproof high-pressure oil pump sealing structure according to claim 1, characterized in that: The inertial drive mechanism comprises a fixed disk (10), the outer circumferential surface of the fixed disk (10) is provided with an inclined guide sleeve (12) surrounding the fixed disk (10), the guide sleeve (12) extends obliquely toward a side away from the movable seal (9), a telescopic connecting rod (11) is elastically arranged inside the guide sleeve (12), the telescopic connecting rod (11) extends toward a side away from the movable seal (9), an extrusion driving rod (13) is arranged on the telescopic connecting rod (11), and the extrusion driving rod (13) is a driving end of the inertial drive mechanism.

6. The leakproof high-pressure oil pump sealing structure according to claim 5, characterized in that: A driving roller (14) is provided on the extrusion driving rod (13), and the driving roller (14) is in contact with the extrusion driving surface (95) of the movable sealing element (9).

7. The leakproof high-pressure oil pump sealing structure according to claim 5, characterized in that: The telescopic connecting rod (11) is located in the guide sleeve (12) and is provided with a support piston (18) at one end thereof. A support spring (17) is sleeved on the telescopic connecting rod (11) at the upper end of the support piston (18). One end of the support spring (17) is in contact with the open end of the guide sleeve (12) for support, and the other end of the support spring (17) is in contact with the support movable support. When the transmission shaft (5) rotates in a circle, the telescopic connecting rod (11) is thrown out to the outside of the guide sleeve (12) by inertia and squeezes the support spring (17).

8. The leakproof high-pressure oil pump sealing structure according to claim 1, characterized in that: The transmission shaft (5) extends into one end of the pump body (1) and is provided with a rotating impeller (7), and a connecting flange (2) is also provided outside the pump body (1).

9. The leakproof high-pressure oil pump sealing structure according to claim 1, characterized in that: An outer sealing ring (16) is provided at the position where the transmission shaft (5) passes through the end cover (4), and a base (6) is provided at the bottom of the pump body (1).

10. The leakproof high-pressure oil pump sealing structure according to claim 1, characterized in that: The number of the outer sealing surfaces (91) is two, which are respectively located on two sides of the movable sealing element (9).

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