A maintainability seal

Abstract

The utility model provides a kind of maintainability sealing device, including the sealing module one, sealing module two and sealing module three being sequentially arranged between shell and main shaft;Its characterized in that: the sealing module two includes sleeve joint in the modified shaft sleeve outside main shaft, sealing ring is equipped between modified shaft sleeve and main shaft, and the one end of modified shaft sleeve is equipped with elastic baffle ring for shaft;The sealing module three is the ceramic layer composite layer that modified shaft sleeve surface is sprayed;The sealing module one includes sealing ring and the hole elastic baffle ring and skeleton oil seal being arranged between front cover and modified shaft sleeve, washer is equipped between hole elastic baffle ring and skeleton oil seal, and sealing ring is arranged between front cover and shell.The utility model is in the face of failure shaft extension seal, can greatly shorten maintenance downtime and reduce maintenance cost, just need to replace modified shaft sleeve, skeleton oil seal, can extend the life cycle of plunger pump;For common seal failure form, sealing improvement measure is taken, modular design is carried out to shaft extension seal, additional modified shaft sleeve is added on rotating shaft, reach wear resistance, reliable extension plunger pump / motor life cycle purpose.

Description

Technical Field

[0001] This utility model relates to a maintainable sealing device, belonging to the field of hydraulic technology, specifically a modular sealing device for a piston pump / motor, particularly a sealing device for extending the service life of a piston pump / motor under high-speed, high-pressure and high-temperature conditions. Background Technology

[0002] Piston pumps / motors are crucial components of hydraulic systems. While piston pumps / motors are constantly evolving towards higher speeds and higher pressures, they also face new technological challenges. This is especially true for piston pumps / motors with a displacement of 355 mL / r or higher, which can reach speeds of several thousand revolutions per minute. After prolonged high-speed, high-temperature operation, and due to their larger size, the linear seal friction speed between the shaft seal and the main shaft is high. This high-speed friction easily causes temperature rise at the sealing interface, with local temperatures reaching over 100°C. Consequently, the shaft extension seal fails before the rotating components, leading to leakage. For example, in one ship's hydraulic steering gear, a shaft seal failure allowed seawater to seep into the pump body along the shaft extension, causing the piston to corrode and seize, nearly resulting in a navigational accident.

[0003] The reliability of the dynamic seal on the shaft extension of a piston pump / motor is one of the core elements ensuring the efficient and stable operation of a hydraulic system. As the power transmission interface between the pump body and the external drive unit, the dynamic seal on the shaft extension must withstand the impact of high-pressure oil leakage, as well as cope with various complex operating conditions such as high-speed rotation, axial vibration, and temperature changes. Once the seal fails, it can lead to oil leakage and reduced system efficiency, or even equipment damage, safety accidents, and environmental pollution. Therefore, the reliability of the dynamic seal on the shaft extension directly determines the durability, economy, and safety of the piston pump / motor. Utility Model Content

[0004] To solve the above-mentioned technical problems, this utility model provides a maintainable sealing device.

[0005] This utility model is achieved through the following technical solution.

[0006] This utility model provides a maintainable sealing device, comprising a sealing module one, a sealing module two, and a sealing module three sequentially disposed between a housing and a main shaft; the sealing module two includes a modified bushing sleeve fitted outside the main shaft, a sealing ring two provided between the modified bushing sleeve and the main shaft, and a shaft elastic retaining ring provided at one end of the modified bushing sleeve; the sealing module three is a ceramic composite layer sprayed on the surface of the modified bushing sleeve; the sealing module one includes a sealing ring one disposed between the front cover and the housing, and a hole elastic retaining ring and a skeleton oil seal disposed between the front cover and the modified bushing sleeve, with a gasket provided between the hole elastic retaining ring and the skeleton oil seal.

[0007] The inner ring of the modified bushing is provided with a sealing ring groove, and the second sealing ring is installed in the sealing ring groove.

[0008] The skeleton oil seal and the front cover are interference fit.

[0009] All three sealing modules—sealing module one, sealing module two, and sealing module three—are radial seals.

[0010] The first and second sealing modules are static seals, while the third sealing module is a dynamic seal.

[0011] The modified bushing is clearance-fitted with the main shaft.

[0012] The front cover and the housing are fitted with a clearance fit.

[0013] The beneficial effects of this utility model are as follows: When facing a failed shaft extension seal, it can greatly shorten maintenance downtime and reduce maintenance costs. Only by replacing the modified shaft sleeve and the skeleton oil seal can the service life of the plunger pump be extended. For common seal failure modes, seal improvement measures are adopted, the shaft extension seal is modularly designed, and a modified shaft sleeve is added to the rotating shaft to achieve the purpose of wear resistance and reliable extension of the service life of the plunger pump / motor. Attached Figure Description

[0014] Figure 1 This is a schematic diagram of the structure of this utility model; Figure 2 This is a cross-sectional view of the present invention; In the diagram: 1-Seal ring one, 2-Elastic retaining ring for holes, 3-Washer, 4-Skeleton oil seal, 5-Front cover, 6-Main shaft, 7-Modified bushing, 8-Seal ring two, 9-Housing, 10-Elastic retaining ring for shaft. Detailed Implementation

[0015] The technical solution of this utility model is further described below, but the scope of protection is not limited to what is described.

[0016] like Figure 1 and 2 As shown, the front cover 5, the skeleton oil seal 4, the gasket 3, and the elastic retaining ring 2 for the hole form an independent sealing module. The skeleton oil seal 4 and the front cover 5 are designed with an interference fit. The skeleton oil seal 4 is pressed into the front cover 5 with the assistance of the tooling. The elastic retaining ring 2 for the hole is installed on the front cover 5. The skeleton oil seal 4 is pressed by the gasket 3, and the position of the skeleton oil seal 4 is locked. A sealing ring 1 is arranged between the front cover 5 and the housing 9 to form a radial seal, which is a static seal.

[0017] Furthermore, the modified bushing plays a core role in the piston pump / motor by "protecting the main shaft, optimizing the seal, and reducing maintenance costs." It is an important design for improving the reliability and economy of the piston pump / motor. Specifically, the modified bushing 7 and the sealing ring 8 form another sealing module. For easy disassembly, the modified bushing 7 and the main shaft 6 are also designed with a clearance fit. The inner ring of the modified bushing 7 is provided with a sealing ring groove. After the sealing ring 8 is installed, it is installed on the main shaft 6. One end is positioned by the shoulder of the main shaft 6, and the other end is fixed by the shaft elastic retaining ring 10, forming a radial seal with the main shaft 6, which is a static seal.

[0018] Furthermore, the third seal is a dynamic seal, which is prone to failure and has a high failure rate. The structure of its sealing device and the surface treatment of the modified bushing 7 are crucial. The surface of the modified bushing 7 is mostly made of sprayed ceramic layer composite material, metal sleeve (main chemical component Ni) + plasma sprayed ceramic AT13. The sprayed ceramic layer composite material has the characteristics of high toughness, corrosion resistance, high temperature resistance and low coefficient of thermal expansion. As an independent component, the modified bushing 7 is easy to ensure machining accuracy and the modification treatment is easy to implement.

[0019] In summary, the shaft extension forms three seals to seal the oil inside the pump / motor cavity.

[0020] Regarding the maintainability of this device, when replacing the skeleton oil seal 4 or the modified bushing 7, since the front cover 5 and the housing 9, and the modified bushing 7 and the main shaft 6 are all clearance fits, it is only necessary to remove the elastic retaining ring 2 for the hole and the elastic retaining ring 10 for the shaft respectively to replace the skeleton oil seal 4 or the modified bushing 7, making maintenance convenient and quick.

[0021] In summary, this invention, without increasing the structural size of the plunger pump, adopts a modular design for the shaft extension seal of the plunger pump / motor. The skeleton oil seal and the front cover form a single module, while the modified bushing and the sealing ring form another independent component. It can be widely used in engineering machinery, agricultural machinery, and all equipment equipped with axial plunger pumps / motors. The modified bushing, as a wear-resistant layer, can prevent the skeleton oil seal from directly contacting and rubbing against the main shaft, reducing main shaft wear and extending its service life. Especially under high-speed and high-pressure conditions, the modified bushing can effectively prevent the skeleton oil seal from causing rotational damage to the shaft extension. As independent components, the modified bushing and the skeleton oil seal can be replaced separately after wear without disassembling or repairing the main shaft, significantly reducing maintenance costs and downtime. It is especially suitable for conditions where seals need to be replaced frequently.

Claims

1. A maintainable sealing device, comprising a sealing module one, a sealing module two, and a sealing module three sequentially disposed between a housing (9) and a main shaft (6); characterized in that: The second sealing module includes a modified bushing (7) sleeved outside the main shaft (6), a second sealing ring (8) is provided between the modified bushing (7) and the main shaft (6), and a shaft elastic retaining ring (10) is provided at one end of the modified bushing (7); the third sealing module is a ceramic layer composite layer sprayed on the surface of the modified bushing (7); the first sealing module includes a first sealing ring (1) provided between the front cover (5) and the housing (9) and a hole elastic retaining ring (2) and a skeleton oil seal (4) provided between the front cover (5) and the modified bushing (7), and a gasket (3) is provided between the hole elastic retaining ring (2) and the skeleton oil seal (4).

2. The maintainable sealing device as described in claim 1, characterized in that: The inner ring of the modified bushing (7) is provided with a sealing ring groove, and the second sealing ring (8) is installed in the sealing ring groove.

3. The maintainable sealing device as described in claim 1, characterized in that: The skeleton oil seal (4) and the front cover (5) are interference fit.

4. The maintainable sealing device as described in claim 1, characterized in that: All three sealing modules—sealing module one, sealing module two, and sealing module three—are radial seals.

5. The maintainable sealing device as described in claim 1, characterized in that: The first and second sealing modules are static seals, while the third sealing module is a dynamic seal.

6. The maintainable sealing device as described in claim 1, characterized in that: The modified bushing (7) and the main shaft (6) are in clearance fit.

7. The maintainable sealing device as described in claim 1, characterized in that: The front cover (5) and the housing (9) are fitted with a clearance.

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