Sliding bearing sealing structure of hydraulic gear pump

Abstract

The utility model discloses a hydraulic gear pump sliding bearing sealing structure which comprises a sliding bearing, a containing groove is distributed in the upper end of the sliding bearing, a hydrogenated nitrile rubber sealing ring is placed in the containing groove, and a boss protruding upwards is arranged at the upper end of the hydrogenated nitrile rubber sealing ring. A polytetrafluoroethylene check ring is further placed in the position, located above the hydrogenated butadiene-acrylonitrile rubber sealing ring, of the containing groove, a groove tightly attached to the boss in a buckled mode is formed in the lower end of the polytetrafluoroethylene check ring, and oil inlet grooves are further distributed in the bottom end of the hydrogenated butadiene-acrylonitrile rubber sealing ring. The sealing device has the advantages of being simple in structure, high in impact resistance, not prone to aging and good in sealing effect.

Description

Technical Field

[0001] The utility model relates to the technical field of hydraulic gear pumps, in particular to a hydraulic gear pump sliding bearing sealing structure. Background Art

[0002] As hydraulic gear pumps are increasingly used in a wide range of applications, demands for high reliability and long service life are growing. The seal structure on the internal sliding bearings of hydraulic gear pumps is particularly important. Current designs for internal seals in hydraulic gear pumps achieve this sealing effect by increasing thickness and compression. However, due to the specialized operating conditions of hydraulic gear pumps—long-term high temperatures and high pressures—seals can easily lose their elasticity and age, shortening the pump's lifespan. Otherwise, specialized materials are required, increasing user costs. Utility Model Content

[0003] The technical problem to be solved by the utility model is to provide a hydraulic gear pump sliding bearing sealing structure, which has a simple structure, high impact resistance, is not prone to aging, and has a good sealing effect.

[0004] In order to solve the above problems, the present invention adopts the following technical solutions:

[0005] A hydraulic gear pump sliding bearing sealing structure includes a sliding bearing, a placement groove is distributed on the upper end of the sliding bearing, a hydrogenated nitrile rubber sealing ring is placed in the placement groove, an upwardly protruding boss is provided on the upper end of the hydrogenated nitrile rubber sealing ring, a polytetrafluoroethylene retaining ring is also placed in the placement groove above the hydrogenated nitrile rubber sealing ring, a groove is provided at the lower end of the polytetrafluoroethylene retaining ring that is tightly engaged with the boss, and an oil inlet groove is also distributed at the bottom end of the hydrogenated nitrile rubber sealing ring.

[0006] A further technical solution is that oil guide grooves are distributed along the vertical direction on the left and right sides of the sliding bearing. The outermost sides of the placement grooves at the left and right ends of the sliding bearing are connected to the top of the oil guide grooves. High-pressure oil flows from the oil guide grooves and enters the oil inlet groove between the sliding bearing and the hydrogenated nitrile rubber sealing ring from the placement grooves on the sliding bearing.

[0007] A further technical solution is that the hydrogenated nitrile rubber sealing ring and the polytetrafluoroethylene retaining ring have equal widths to facilitate installation.

[0008] The beneficial effects of the utility model are as follows: the utility model provides a hydraulic gear pump sliding bearing sealing structure, in which a hydrogenated nitrile rubber sealing ring is first placed in a placement groove, and then a layer of polytetrafluoroethylene retaining ring is placed on the hydrogenated nitrile rubber sealing ring, which has the effect of resisting impact and aging; at the same time, a concave-convex structure design is adopted between the hydrogenated nitrile rubber sealing ring and the hydrogenated nitrile rubber sealing ring, which can effectively perform positioning, improve mutual support effect, and improve impact resistance; the lower end face of the hydrogenated nitrile rubber sealing ring is designed with an oil inlet groove, and high-pressure oil enters the oil inlet groove, always pushing the end face of the sliding bearing to be close to the end face of the gear, thereby having a sealing effect and reducing leakage. BRIEF DESCRIPTION OF THE DRAWINGS

[0009] In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the following briefly introduces the drawings required for the embodiments or the description of the prior art. Obviously, the drawings described below are only some embodiments of the present invention. For ordinary technicians in this field, other drawings can be obtained based on these drawings without paying any creative work.

[0010] Figure 1 This is a three-dimensional diagram of a hydraulic gear pump sliding bearing sealing structure of the utility model;

[0011] Figure 2 This is a top view of a hydraulic gear pump sliding bearing sealing structure of the utility model;

[0012] Figure 3 This is a front view of a hydraulic gear pump sliding bearing sealing structure of the utility model;

[0013] Figure 4 This is a schematic diagram of the hydraulic gear pump sliding bearing sealing structure of the utility model, in which high-pressure oil enters the oil inlet groove on one side of the sliding bearing;

[0014] Figure 5 This is a schematic diagram of a hydraulic gear pump sliding bearing sealing structure of the utility model in which high-pressure oil is filled in a hydrogenated nitrile rubber sealing ring;

[0015] Figure 6 This is a schematic diagram of the force applied to the sliding bearing under the action of high-pressure oil in a hydraulic gear pump sliding bearing sealing structure of the utility model.

[0016] Figure 1-6 In the figure: 1-sliding bearing, 2-PTFE retaining ring, 3-groove, 4-boss, 5-oil inlet groove, 6-hydrogenated nitrile rubber sealing ring, 7-placement groove, 8-oil guide groove, 9-high-pressure oil, 10-sliding bearing end face. DETAILED DESCRIPTION

[0017] The preferred embodiments of the present invention are described in detail below so that the advantages and features of the present invention can be more easily understood by those skilled in the art, thereby making a clearer and more precise definition of the protection scope of the present invention.

[0018] See Figure 1-6 As shown, a hydraulic gear pump sliding bearing sealing structure includes a sliding bearing 1, a placement groove 7 is distributed on the upper end of the sliding bearing 1, a hydrogenated nitrile rubber sealing ring 6 is placed in the placement groove 7, an upwardly protruding boss 4 is provided on the upper end of the hydrogenated nitrile rubber sealing ring 6, a polytetrafluoroethylene retaining ring 2 is also placed above the placement groove 7 located above the hydrogenated nitrile rubber sealing ring 6, a groove 3 is provided at the lower end of the polytetrafluoroethylene retaining ring 2 that is tightly engaged with the boss 4, and an oil inlet groove 5 is also distributed at the bottom end of the hydrogenated nitrile rubber sealing ring 6.

[0019] The left and right sides of the sliding bearing 1 are also provided with oil guide grooves 8 along the vertical direction. The outermost sides of the placement grooves 7 at the left and right ends of the sliding bearing 1 are connected to the top of the oil guide grooves 8. The high-pressure oil 9 flows from the oil guide grooves 8 and enters the oil inlet groove 5 between the sliding bearing 1 and the hydrogenated nitrile rubber sealing ring 6 from the placement grooves 7 on the sliding bearing 1. Figure 4 and Figure 5 As shown, of course the oil inlet groove 5 between the other sliding bearings 1 and the hydrogenated nitrile rubber sealing ring 6 can enter. The hydrogenated nitrile rubber sealing ring 6 and the polytetrafluoroethylene retaining ring 2 are equal in width for easy installation.

[0020] In this embodiment, the sealing structure is simple to assemble and not prone to error. During operation, the hydrogenated nitrile rubber sealing ring 6 (greased on both sides) is first placed in the placement groove 7 of the sliding bearing 1; then the polytetrafluoroethylene retaining ring 2 (greased on the groove 3 side) is placed tightly on the boss 4 of the hydrogenated nitrile rubber sealing ring 6.

[0021] The use of polytetrafluoroethylene (PTFE) retaining ring 2 is impact-resistant, and the lower end surface is designed with a groove 3 to provide support for the hydrogenated nitrile rubber sealing ring 6, which plays a buffering role and reduces the direct external impact on the hydrogenated nitrile rubber sealing ring 6. The hydrogenated nitrile rubber sealing ring 6 has an operating temperature of -25 to +140°C and also has an impact-resistant effect. During use, high-pressure oil enters the oil inlet groove 5 through the cavity gap between the sliding bearing 1 and the pump body. Figure 6 As shown, under the action of high-pressure oil, the thrust F generated by the high-pressure oil on the sliding bearing 1 always pushes the sliding bearing end face 10 on the bottom end side of the sliding bearing 1 close to the gear end face, thereby achieving a sealing effect and reducing leakage. This fundamentally solves the problem of large leakage on the oil pump end face caused by aging of the seal, solves the short service life of the hydraulic gear pump, and even the risk of failure of the hydraulic gear pump, greatly improves the service life of the hydraulic gear pump, and avoids short-term failures caused by seals during the use of the pump.

[0022] The above are only specific implementation methods of the present invention, but the protection scope of the present invention is not limited thereto. Any changes or replacements that are not conceived through creative work should be included in the protection scope of the present invention.

Claims

1. A hydraulic gear pump sliding bearing sealing structure, comprising a sliding bearing, characterized in that: A placement groove is provided at the upper end of the sliding bearing, a hydrogenated nitrile rubber sealing ring is placed in the placement groove, an upwardly protruding boss is provided at the upper end of the hydrogenated nitrile rubber sealing ring, a polytetrafluoroethylene retaining ring is also placed in the placement groove above the hydrogenated nitrile rubber sealing ring, a groove is provided at the lower end of the polytetrafluoroethylene retaining ring that is tightly fitted with the boss, and an oil inlet groove is also provided at the bottom end of the hydrogenated nitrile rubber sealing ring.

2. A hydraulic gear pump sliding bearing sealing structure according to claim 1, characterized in that: Oil guide grooves are also distributed along the vertical direction on the left and right side ends of the sliding bearing.

3. The hydraulic gear pump sliding bearing sealing structure according to claim 1, characterized in that: The hydrogenated nitrile rubber sealing ring and the polytetrafluoroethylene retaining ring have the same width.

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