A mechanical seal device for a high-speed, high-pressure hydraulic pump

Abstract

This utility model discloses a mechanical seal device for a high-speed, high-pressure hydraulic pump, including a housing with a shaft hole at its center. A drive shaft passes through the shaft hole, and a dynamic ring structure is installed on the top of the drive shaft. A stationary ring structure is installed at the bottom of the drive shaft. The stationary ring structure includes a stationary ring body and a bushing installed at the bottom of the stationary ring body. The bushing is installed inside the shaft hole and fitted onto the drive shaft body. A cooling structure is provided on the outer side of the housing at the bushing. The cooling structure includes an insulation shell and heat exchange fins. An air outlet is connected to one side of the insulation shell, and an air inlet is provided on the other side. The cold air generated by the cooling vortex tube, combined with the flow equalization design of the flow divider, achieves directional and precise cooling of the stationary ring area. The integrated heat exchange fins increase the heat dissipation area, and the tapered flow channel enhances the airflow heat exchange efficiency, effectively solving the problem of frictional heat accumulation under high speed and high pressure.

Description

Technical Field

[0001] This utility model belongs to the technical field of hydraulic pump mechanical seal structure, specifically relating to a mechanical seal device for a high-speed, high-pressure hydraulic pump. Background Technology

[0002] As a core component of modern industrial power transmission, the reliability and lifespan of high-speed, high-pressure hydraulic pumps largely depend on the performance of a critical part—the mechanical seal. Especially under extreme conditions, such as high-speed rotation and high-pressure media, the interface between the dynamic and static rings of the mechanical seal generates intense frictional heat. If this heat cannot be effectively dissipated in time, the temperature of the sealing rings (especially the static ring) will rise sharply, causing thermal deformation, thermal cracking, or even carbonization failure of the material. This leads to a rapid deterioration of the sealing performance and seriously threatens the stable operation of the pump unit.

[0003] Currently, for cooling the mechanical seals in high-speed, high-pressure hydraulic pumps, especially in the stationary ring area which bears the main heat load, the industry commonly uses external circulating water cooling. This solution requires a separate external cooling water circulation system. However, external water cooling systems introduce numerous potential leakage points and sources of failure, making daily maintenance and repair cumbersome and complex, resulting in high operating and maintenance costs. Furthermore, they have strict requirements for cooling water quality, and over long-term operation, scale buildup can easily clog cooling channels, reducing cooling efficiency and even causing corrosion problems.

[0004] Therefore, in response to the above problems, this utility model proposes a mechanical seal device for a high-speed, high-pressure hydraulic pump. While meeting the high-efficiency cooling requirements of the mechanical seal under extreme high-speed and high-pressure conditions, it eliminates the need for a complex and bulky external water cooling system, and provides a mechanical seal cooling solution that is easy to maintain and highly reliable, without the need for a complex external cooling circuit. Utility Model Content

[0005] To achieve the above objectives, this utility model provides the following technical solution: a mechanical seal device for a high-speed, high-pressure hydraulic pump, comprising a housing, a shaft hole at the center of the housing, a drive shaft passing through the shaft hole, a dynamic ring structure mounted on the top of the drive shaft, and a stationary ring structure mounted on the bottom of the drive shaft. The stationary ring structure includes a stationary ring body, a bushing mounted on the bottom of the stationary ring body, the bushing being installed inside the shaft hole and fitted onto the drive shaft body. A cooling structure is provided on the outer side of the housing at the bushing location. The cooling structure includes a heat insulation shell and heat exchange fins. An air outlet is connected to one side of the heat insulation shell, and an air inlet is provided on the other side of the heat insulation shell. A flow divider is provided on the inner wall of the heat insulation shell on the side of the air inlet. Air outlet holes are evenly distributed on the surface of the flow divider. A cooling vortex tube is installed at the air inlet. The cold air outlet of the cooling vortex tube is connected to the air inlet, and the air inlet end of the cooling vortex tube is connected to a compressed air source.

[0006] As a preferred technical solution of this utility model, the moving ring structure includes a moving ring body, the moving ring body is nested in the shaft of the transmission shaft, a spring seat is sleeved on the outside of the moving ring body, and a spring body is installed inside the spring seat.

[0007] As a preferred technical solution of this utility model, a pressure cap is provided on the top of the stationary ring body, and the stationary ring body and the bushing are fixed to the inside of the outer shell by the pressure cap and bolts.

[0008] As a preferred embodiment of this utility model, the distance between the air outlet side of the insulation shell and the outer shell is smaller than the distance between the air inlet side of the insulation shell and the outer shell.

[0009] As a preferred technical solution of this utility model, the heat insulation shell, heat exchange fins and outer shell are integrally formed.

[0010] As a preferred embodiment of this utility model, the bottom of the outer shell is fixed to the housing of the hydraulic pump by a flange, and a sealing gasket is installed at the fixed fitting point.

[0011] Compared with the prior art, the beneficial effects of this utility model are:

[0012] (1) This utility model achieves directional and precise cooling of the static ring area by combining the cold air generated by the cooling vortex tube with the flow equalization design of the flow divider plate; the integrated heat exchange fins increase the heat dissipation area, and the tapered flow channel enhances the heat exchange efficiency of the airflow, effectively solving the problem of frictional heat accumulation under high speed and high pressure, avoiding thermal deformation, thermal cracking or carbonization failure of the sealing ring due to high temperature, and significantly improving the sealing reliability.

[0013] (2) This utility model abandons the traditional external circulating water cooling system and adopts a compressed air driven vortex tube cooling scheme. It does not require complex external cooling circuits, water pumps and water pipe connectors, reducing potential water leakage points and sources of failure, and improving the operational stability of the device from the structural design. Moreover, there is no need to manage the cooling water quality, avoiding the problems of scaling and blockage and pipeline corrosion that are prone to occur in traditional water cooling systems. The core cooling components of the device, the cooling vortex tube and the flow divider, have simple structures. Maintenance only requires periodic checks on the compressed air supply and airflow, which greatly simplifies the daily maintenance process and reduces the operation and maintenance costs. Attached Figure Description

[0014] The accompanying drawings are provided to further illustrate the present invention and form part of the specification. They are used together with the embodiments of the present invention to explain the present invention, but do not constitute a limitation thereof. In the drawings:

[0015] Figure 1 This is a schematic diagram of the overall cross-sectional structure of this utility model;

[0016] Figure 2This is a top view cross-section of the cooling structure in this utility model;

[0017] In the diagram: 1. Outer shell; 2. Shaft hole; 3. Drive shaft; 4. Stationary ring body; 5. Bushing; 6. Insulation shell; 7. Heat exchange fins; 8. Air outlet; 9. Air inlet; 10. Flow divider; 11. Air outlet hole; 12. Cooling vortex tube; 13. Moving ring body; 14. Spring seat; 15. Spring body; 16. Pressure cap. Detailed Implementation

[0018] The technical solutions of the present utility model will be clearly and completely described below with reference to the accompanying drawings of the embodiments. Obviously, the described embodiments are only some embodiments of the present utility model, and not all embodiments. Based on the embodiments of the present utility model, all other embodiments obtained by those of ordinary skill in the art without creative effort are within the protection scope of the present utility model.

[0019] Example

[0020] Please see Figure 1-2 This utility model provides the following technical solution: a mechanical seal device for a high-speed high-pressure hydraulic pump, including a housing 1, a shaft hole 2 at the center of the housing 1, a drive shaft 3 passing through the shaft hole 2, a dynamic ring structure installed on the top shaft of the drive shaft 3, a stationary ring structure installed on the bottom of the drive shaft 3, the stationary ring structure including a stationary ring body 4, a bushing 5 installed at the bottom of the stationary ring body 4, the bushing 5 being installed inside the shaft hole 2 and fitted onto the shaft of the drive shaft 3, a cooling structure being provided on the outer side of the housing 1 at the bushing 5, the cooling structure including a heat insulation shell 6 and heat exchange fins 7, an air outlet 8 connected to one side of the heat insulation shell 6, an air inlet 9 opened on the other side of the heat insulation shell 6, a flow divider 10 being provided on the inner wall of the heat insulation shell 6 on the side of the air inlet 9, an air outlet 11 being evenly opened on the surface of the flow divider 10, a cooling vortex tube 12 being installed on the air inlet 9, the cold air outlet of the cooling vortex tube 12 being connected to the air inlet 9, and the air inlet end of the cooling vortex tube 12 being connected to a compressed air source.

[0021] In order to maintain the effective sealing performance of the dynamic sealing pair, and to compensate for the gap by the spring preload even under high-speed rotation and slight wear, in this embodiment, as a preferred technical solution of the present invention, the dynamic ring structure includes a dynamic ring body 13, which is nested in the shaft of the transmission shaft 3. A spring seat 14 is sleeved on the outside of the dynamic ring body 13, and a spring body 15 is installed inside the spring seat 14.

[0022] To prevent displacement or loosening under the action of high-pressure hydraulic oil and the rotational vibration of the drive shaft 3, and to ensure the installation stability and sealing reliability of the stationary ring structure, in this embodiment, as a preferred technical solution of the present invention, a pressure cap 16 is provided on the top of the stationary ring body 4, and the stationary ring body 4 and the bushing 5 are fixed to the inside of the outer shell 1 by the pressure cap 16 and bolts.

[0023] In order to prolong the contact time between the cooling airflow and the outer shell 1 and the heat exchange fins 7 inside the insulation shell 6, enhance the heat exchange between the airflow and the heating components, and improve the cooling efficiency, in this embodiment, as a preferred technical solution of the present invention, the distance between the air outlet 8 side of the insulation shell 6 and the outer shell 1 is smaller than the distance between the air inlet 9 side of the insulation shell 6 and the outer shell 1.

[0024] In order to reduce the contact thermal resistance during the heat transfer process, improve the heat transfer efficiency between the outer shell 1 and the cooling structure, and enhance the overall mechanical strength of the insulation shell 6, the heat exchange fins 7 and the outer shell 1, and simplify the manufacturing and assembly process, in this embodiment, as a preferred technical solution of the present invention, the insulation shell 6, the heat exchange fins 7 and the outer shell 1 are integrally set.

[0025] In order to achieve a stable connection between the outer casing 1 and the hydraulic pump housing, and at the same time prevent high-pressure hydraulic oil in the pump from leaking from the connection gap, and ensure the reliability and sealing of the connection between the device and the pump body, in this embodiment, as a preferred technical solution of the present invention, the bottom of the outer casing 1 is fixed to the hydraulic pump housing by a flange, and a sealing gasket is installed at the fixed fitting point.

[0026] In summary, the specific working principle of this utility model, based on the above-described technical solution, is as follows:

[0027] Regarding the sealing function: the device is based on the housing 1 as the load-bearing structure, and the drive shaft 3 passes through the shaft hole 2 in the center of the housing 1 to realize power transmission; the dynamic ring structure on the top shaft of the drive shaft 3 rotates synchronously with the drive shaft 3, wherein the dynamic ring body 13 obtains continuous preload through the spring body 15 in the spring seat 14, ensuring that the dynamic ring body 13 and the stationary ring body 4 at the bottom of the drive shaft 3 are tightly fitted to form a dynamic sealing pair, effectively preventing high-pressure hydraulic oil leakage; the stationary ring body 4 is fixed inside the housing 1 by the pressure cap 16 and bolts, and the bushing 5 at its bottom is fitted on the shaft of the drive shaft 3 and installed in the shaft hole 2, further enhancing the stability and sealing reliability of the stationary ring structure.

[0028] Regarding cooling functionality: For the main heat load in the static ring area, the device achieves efficient heat dissipation through a cooling structure at the outer bushing 5 of the outer casing 1. The core power source of the cooling system is compressed air, typically composed of an industrial air compressor and piping system. The air compressor draws in air from the atmosphere and compresses it to the working pressure range via mechanical compression. The compressed air first enters its own storage tank for pressure stabilization and storage to eliminate pressure fluctuations and reserve a certain amount of air to ensure continuous air supply. Subsequently, the compressed air undergoes purification and pressure stabilization treatment through a gas triplet to prevent moisture, oil, and impurities from entering subsequent components and causing blockage or corrosion. The purified compressed air is then transported to the inlet end of the cooling vortex tube 12 through pressure-resistant pipelines.

[0029] After compressed air is introduced into the cooling vortex tube 12, the compressed air is made to rotate at high speed through the special structure of the internal vortex chamber. Under the action of centrifugal force, the airflow forms a hot airflow along the inner wall of the vortex tube, moves towards the hot end of the vortex tube and is discharged through the hot end valve. Meanwhile, a low-temperature airflow is formed in the central area, and the low-temperature cold air is continuously output through the cold air outlet. The temperature of the cold air is 20-50°C lower than that of the inlet air. The low-temperature cold air is delivered to the air inlet 9 of the insulation shell 6 through the cold air outlet. The cold air entering the insulation shell 6 forms a distributed airflow through the evenly opened air outlet 11 under the action of the flow divider 10, and fully contacts the outer shell 1 and the integrated heat exchange fins 7. Since the distance between the air outlet 8 side of the insulation shell 6 and the outer shell 1 is smaller than the distance between the air inlet 9 side, it promotes continuous heat exchange between the cold air and the heat-generating components during the flow process, and efficiently absorbs the heat generated by friction of the static ring body 4 and the surrounding structure. Finally, the heated gas is discharged from the air outlet 8, completing the heat dissipation cycle.

[0030] Finally, it should be noted that, in this utility model, unless otherwise explicitly specified and limited, the terms "installation," "setting," "connection," "fixing," "screw connection," etc., should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral part; they can refer to a mechanical connection or an electrical connection; they can refer to a direct connection or an indirect connection through an intermediate medium; they can refer to the internal connection of two components or the interaction between two components. Unless otherwise explicitly limited, those skilled in the art can understand the specific meaning of the above terms in this utility model according to the specific circumstances.

[0031] The above description is merely a preferred embodiment of the present utility model and is not intended to limit the present utility model. Although the present utility model has been described in detail with reference to the foregoing embodiments, those skilled in the art can still modify the technical solutions described in the foregoing embodiments or make equivalent substitutions for some of the technical features. Any modifications, equivalent substitutions, improvements, etc., made within the spirit and principles of the present utility model should be included within the protection scope of the present utility model.

Claims

1. A mechanical seal device for a high-speed, high-pressure hydraulic pump, comprising a housing (1), wherein a shaft hole (2) is provided at the center of the housing (1), a drive shaft (3) passes through the shaft hole (2), a dynamic ring structure is installed on the top shaft of the drive shaft (3), and a stationary ring structure is installed on the bottom of the drive shaft (3), characterized in that: The stationary ring structure includes a stationary ring body (4), a bushing (5) is installed at the bottom of the stationary ring body (4), the bushing (5) is installed inside the shaft hole (2) and sleeved on the shaft body of the transmission shaft (3), a cooling structure is provided on the outer side of the outer shell (1) at the bushing (5), the cooling structure includes a heat insulation shell (6) and heat exchange fins (7), an air outlet (8) is connected to one side of the heat insulation shell (6), an air inlet (9) is opened on the other side of the heat insulation shell (6), a flow divider (10) is provided on the inner wall of the heat insulation shell (6) on the side of the air inlet (9), an air outlet (11) is evenly opened on the surface of the flow divider (10), a cooling vortex tube (12) is installed on the air inlet (9), the cold air outlet of the cooling vortex tube (12) is connected to the air inlet (9), and the air inlet end of the cooling vortex tube (12) is connected to a compressed air source.

2. The mechanical seal device for a high-speed, high-pressure hydraulic pump according to claim 1, characterized in that: The moving ring structure includes a moving ring body (13), which is nested in the shaft of the transmission shaft (3). A spring seat (14) is sleeved on the outside of the moving ring body (13), and a spring body (15) is installed inside the spring seat (14).

3. The mechanical seal device for a high-speed, high-pressure hydraulic pump according to claim 1, characterized in that: The stationary ring body (4) is provided with a pressure cap (16) on the top, and the stationary ring body (4) and the bushing (5) are fixed to the inside of the outer shell (1) by the pressure cap (16) and bolts.

4. The mechanical seal device for a high-speed, high-pressure hydraulic pump according to claim 1, characterized in that: The distance between the air outlet (8) side of the insulation shell (6) and the outer shell (1) is smaller than the distance between the air inlet (9) side of the insulation shell (6) and the outer shell (1).

5. The mechanical seal device for a high-speed, high-pressure hydraulic pump according to claim 1, characterized in that: The heat insulation shell (6), heat exchange fins (7) and outer shell (1) are integrally formed.

6. The mechanical seal device for a high-speed, high-pressure hydraulic pump according to claim 1, characterized in that: The bottom of the outer casing (1) is fixed to the housing of the hydraulic pump by a flange, and a sealing gasket is installed at the fixed fitting point.

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