阅读说明：本技术 用于液压泵马达中的组合轴封结构 (Combined shaft seal structure for hydraulic pump motor ) 是由 米江 李仰贤 胥飞 耿攀 成龙刚 何增强 于 2020-11-16 设计创作，主要内容包括：本发明属液压技术领域,涉及一种用于液压泵马达轴封组合结构包括轴封座和密封圈；轴封座为空心圆柱体；密封圈包括外密封圈和内密封圈；外密封圈置于轴封座外壁上；内密封圈置于轴封座内壁上；轴封座内壁和轴封座外壁上均开设密封槽,外密封圈和内密封圈分别置于密封槽内；轴封座内壁和轴封座外壁上均开设均压槽。还包括支撑圈；支撑圈置于轴封座内壁上的密封槽内；还包括开设在轴封座端面处的螺纹孔。本发明使用轴封座、密封圈及支撑圈做成轴封组合结构,很大程度上解决了轴封装拆困难的问题,同时轴封不易损坏,可以重复使用,成本低。(The invention belongs to the technical field of hydraulic pressure, and relates to a shaft seal combined structure for a hydraulic pump motor, which comprises a shaft seal seat and a seal ring; the shaft seal seat is a hollow cylinder; the sealing ring comprises an outer sealing ring and an inner sealing ring; the outer sealing ring is arranged on the outer wall of the shaft seal seat; the inner sealing ring is arranged on the inner wall of the shaft seal seat; sealing grooves are formed in the inner wall of the shaft seal seat and the outer wall of the shaft seal seat respectively, and the outer sealing ring and the inner sealing ring are arranged in the sealing grooves respectively; the inner wall of the shaft seal seat and the outer wall of the shaft seal seat are both provided with pressure equalizing grooves. The device also comprises a support ring; the support ring is arranged in a seal groove on the inner wall of the shaft seal seat; the shaft seal structure further comprises a threaded hole formed in the end face of the shaft seal seat. The shaft seal seat, the seal ring and the support ring are made into a shaft seal combined structure, so that the problem of difficulty in assembling and disassembling the shaft seal is solved to a great extent, and meanwhile, the shaft seal is not easy to damage, can be repeatedly used and is low in cost.)

1. A shaft seal combined structure used in a hydraulic pump motor is characterized in that the shaft seal combined structure used in the hydraulic pump motor comprises a shaft seal seat (4) and a sealing ring; the shaft seal seat (4) is a hollow cylinder; and the sealing rings are respectively arranged on the inner wall and the outer wall of the shaft seal seat (4).

2. A shaft seal combination for use in a hydraulic pump motor according to claim 1, characterized in that the sealing rings comprise an outer sealing ring (2) and an inner sealing ring (6); the outer sealing ring (2) is arranged on the outer wall of the shaft seal seat (4); the inner sealing ring (6) is arranged on the inner wall of the shaft seal seat (4).

3. The shaft seal combination structure used in a hydraulic pump motor according to claim 2, wherein the inner wall of the shaft seal seat (4) and the outer wall of the shaft seal seat (4) are both provided with a sealing groove, and the outer sealing ring (2) and the inner sealing ring (6) are respectively arranged in the sealing grooves.

4. A shaft seal assembly for use in a hydraulic pump motor according to claim 3, characterized in that the shaft seal assembly further comprises a support ring (5); the support ring (5) is arranged in the sealing groove on the inner wall of the shaft seal seat (4).

5. Shaft seal assembly for use in a hydraulic pump motor according to claim 4, characterized in that the size of the shaft seal holder (4) is adapted to the hydraulic motor.

6. Shaft seal assembly for use in a hydraulic pump motor according to claim 5, characterized in that the shaft seal housing (4) is a steel structure shaft seal housing.

7. A shaft seal assembly for use in a hydraulic pump motor according to any one of claims 1-6, characterized in that the shaft seal assembly further comprises two threaded holes provided on one side end surface of the shaft seal holder (4).

8. The shaft seal assembly structure for use in a hydraulic pump motor according to claim 7, wherein the shaft seal seat (4) is provided with pressure equalizing grooves on both the inner wall and the outer wall.

Technical Field

The invention belongs to the technical field of hydraulic pressure, and particularly relates to a shaft seal combined structure for a hydraulic pump motor.

Background

In the field of hydraulic pump motors at present, most pump motor products use a framework rotary shaft seal to seal return oil of a shell, but the framework rotary shaft seal is damaged after being detached every time, even if a pressure air source is used for driving the shaft seal out, the sealing effect of the shaft seal is greatly reduced, and if mechanical detachment sometimes causes damage to parts such as a bearing or the shell. Particularly, in the product development stage, the product is decomposed and assembled for many times, a new framework rotary shaft seal needs to be replaced, the disassembly and the assembly are inconvenient, and a large amount of waste is caused.

Disclosure of Invention

In order to solve the structural design problems that the shaft seal of the traditional hydraulic pump motor is difficult to seal and disassemble and has destructiveness, the invention provides the shaft seal combined structure for the hydraulic pump motor.

In order to achieve the purpose, the invention adopts the technical scheme that:

a shaft seal combined structure used in a hydraulic pump motor comprises a shaft seal seat and a sealing ring; the shaft seal seat is a hollow cylinder; and the sealing rings are respectively arranged on the inner wall and the outer wall of the shaft seal seat.

The sealing ring comprises an outer sealing ring and an inner sealing ring; the outer sealing ring is arranged on the outer wall of the shaft seal seat; the inner sealing ring is arranged on the inner wall of the shaft seal seat.

Seal grooves are formed in the inner wall of the shaft seal seat and the outer wall of the shaft seal seat, and the outer seal ring and the inner seal ring are arranged in the seal grooves respectively.

The shaft seal combined structure used in the hydraulic pump motor further comprises a support ring; the support ring is arranged in a seal groove on the inner wall of the shaft seal seat.

The size of the shaft seal seat is matched with that of the hydraulic motor.

The shaft seal seat is a steel structure shaft seal seat.

The shaft seal combined structure for the hydraulic pump motor further comprises two holes formed in the end face of one side of the shaft seal seat.

The shaft seal combined structure for the hydraulic pump motor further comprises pressure equalizing grooves formed in the inner wall and the outer wall of the shaft seal seat.

The invention has the beneficial effects that:

1. the invention provides a shaft seal combination structure used in a hydraulic pump motor, which comprises a shaft seal seat and a sealing ring; the shaft seal seat is a hollow cylinder; and the sealing rings are respectively arranged on the inner wall and the outer wall of the shaft seal seat. The sealing ring comprises an outer sealing ring and an inner sealing ring; the outer sealing ring is arranged on the outer wall of the shaft seal seat; the inner sealing ring is arranged on the inner wall of the shaft seal seat. The bearing seat can be repeatedly used by replacing the sealing ring and the supporting ring; the sealing washer can quick change be other different materials, satisfies the requirement of the different temperature operating modes of product.

2. In the invention, the size of the shaft seal seat is matched with that of the hydraulic motor. The shaft seal seat is a steel structure shaft seal seat. Aiming at hydraulic motors with different specifications and different models, the size of the inner diameter and the outer diameter of the shaft seal seat only needs to be changed; the shaft seal seat is of a steel structure, is convenient to process, has low requirements on material marks, hardness and other elements, and is low in manufacturing cost.

3. In the invention, the inner wall of the shaft seal seat and the outer wall of the shaft seal seat are respectively provided with a seal groove, and the outer seal ring and the inner seal ring are respectively arranged in the seal grooves. The depth of the groove on the shaft seal seat can be adjusted to adjust the compression amount of the outer sealing ring and the inner sealing ring, and the use requirements of different cavity pressures can be met.

4. In the invention, the inner wall of the shaft seal seat and the outer wall of the shaft seal seat are both provided with pressure equalizing grooves. Through the outward flowing fluid of storage cavity, can guarantee that the shaft seal seat receives even radial force at this position, can also prevent that local clearance from expanding.

5. The shaft seal combined structure used in the hydraulic pump motor also comprises two holes arranged on the end surface of the shaft seal seat, so that the shaft seal combined structure can be conveniently disassembled and assembled on a product.

Drawings

FIG. 1 is a schematic cross-sectional view of a combined shaft seal structure installed in a hydraulic pump motor according to the present invention;

FIG. 2 is a schematic view of a combined shaft seal structure provided in the present invention; FIG. 2(a) is a front view, and FIG. 2(b) is a side sectional view; FIG. 2(c) is a partial enlarged view of the equalizing groove;

wherein:

1. a housing; 2. an outer sealing ring; 3. a circlip; 4. a shaft seal seat; 5. a support ring; 6. an inner seal ring; 7. a drive shaft; 8. a retainer ring for a shaft; 9. and a bearing.

Detailed Description

The present invention will now be described in detail with reference to the accompanying drawings and examples.

Embodiment referring to fig. 2, the shaft seal combination structure for a hydraulic pump motor provided by the embodiment includes a shaft seal seat 4 and a seal ring; the shaft seal seat 4 is a hollow cylinder; the sealing rings are respectively arranged on the inner wall and the outer wall of the shaft seal seat 4; and pressure equalizing grooves are formed in the inner wall and the outer wall of the shaft seal seat.

The sealing ring comprises an outer sealing ring 2 and an inner sealing ring 6; the outer sealing ring 2 is arranged on the outer wall of the shaft seal seat 4; the inner sealing ring 6 is arranged on the inner wall of the shaft sealing seat 4. Seal grooves are formed in the inner wall of the shaft seal seat 4 and the outer wall of the shaft seal seat 4, and the outer seal ring 2 and the inner seal ring 6 are arranged in the seal grooves respectively.

The shaft seal combined structure used in the hydraulic pump motor also comprises a support ring 5; the support ring 5 is arranged in a seal groove on the inner wall of the shaft seal seat 4. The support ring 5 is in contact with the inner seal ring 6.

In this embodiment, the size and the hydraulic motor phase-match of shaft seal seat 4, the interior outer diameter size can only need to change in the shaft seal seat to the interior outer seal structure to different specifications, different models of chooseing for use, satisfies different models of hydraulic motor's sealed, and the flexibility is good.

In this embodiment, the shaft seal seat 4 is a steel structure shaft seal seat. The processing is convenient, the requirements on the material grade, the hardness and other elements are not high, and the manufacturing cost is low.

The combined shaft seal structure provided by the embodiment is used for axial sealing of a hydraulic pump motor, and the specific process is as follows:

referring to fig. 1, the hydraulic motor includes a housing 1, a transmission shaft 7, and a bearing 9; the bearing 9 is arranged in the shell 1, one end of the bearing 9 is provided with a shaft retainer ring 8, and the other end of the bearing 9 is connected with the transmission shaft 7.

The shaft seal seat 4 is sleeved outside the transmission shaft 7, the outermost end of the shaft seal seat 4 is in contact with the shell 1, and the outer seal ring 2 is arranged in the seal groove in the outer wall of the shaft seal seat 4, so that the outer wall of the shaft seal seat 4 and the shell 1 form axial seal; the inner wall of the shaft seal seat 4 is contacted with the outer wall of the transmission shaft 7, and a sealing ring 6 and a support ring 5 are arranged in a sealing groove of the inner wall of the shaft seal seat 4, so that the inner wall of the shaft seal seat 4 is axially sealed with the transmission shaft 7; the left side of the shaft seal holder 4 is in contact with the bearing 9.

When the shaft seal seat is installed, a clearance fit structure is arranged between the outer wall of the shaft seal seat 4 and the shell 1, the clearance value is designed to be 0.04-0.08 mm, and the specific clearance value can be selected according to different shell pressures and product rotating speeds. Meanwhile, the outer diameter of the shaft seal seat 4 is determined according to the diameter of the mounting hole of the shell 1

When the shaft seal device is installed, a clearance fit structure is formed between the inner wall of the shaft seal seat 4 and the transmission shaft 7, and the clearance value is designed to be 0.02-0.05 mm; the specific gap value can be selected according to different shell pressures. Meanwhile, the inner diameter of the shaft seal seat 4 is determined according to the diameter of the step of the transmission shaft 7.

When the shaft seal device is installed, an axial clearance fit structure is arranged between the shaft seal seat 4 and the clamping ring 3, and the axial clearance is designed to be 0.3 +/-0.1 mm.

In this embodiment, shaft seal seat 4 is provided with the screw hole near 3 sides of circlip, and the screw hole size with dismantle the frock phase-match, make things convenient for the installation of shaft seal seat 4 to dismantle.

According to the invention, on the hydraulic pump motor, the shaft seal combined structure is used, so that the problems of inconvenience in assembly and disassembly and waste caused by the prior use of the framework rotating oil are solved, and meanwhile, sealing rings made of different materials can be replaced to meet the requirements of products on different temperature working conditions; the bearing seat can be repeatedly used; the processing is convenient, and the manufacturing cost is low; the compression amount of the sealing ring can be adjusted through the depth of the sealing groove, so that the use requirements of different cavity pressures can be met; the sealing structure can be applied to a shell deep hole sealing structure and meets sealing structures with different precisions.