Mechanical sealing device for two-stage compression integrated compressor

Abstract

The utility model discloses a mechanical sealing device for a two-stage compression integrated compressor, which is mounted on a matched main shaft and comprises a bearing, a moving ring component, a push ring, a static ring component, a static ring seat and a spring. The movable ring assembly is formed by embedding a movable ring and a movable ring seat in an interference fit mode, the movable ring assembly is installed on the main shaft in a ring sleeving mode and located on the rear side of the bearing, the movable ring seat is axially provided with a plurality of spring holes used for containing springs, and the springs are arranged in the spring holes and abut against the push ring to one side of the bearing. The static ring assembly comprises a static ring and a static ring seat, and the static ring and the static ring seat are installed on the main shaft in a ring sleeving mode and located on the rear side of the movable ring seat. The static ring and the movable ring are attached in a sliding mode and form end face movable sealing. The mechanical sealing device for the two-stage compression integrated compressor is simple in structure and excellent in compensation performance, the sealing performance is improved, leakage of lubricating oil is reduced, and the operation stability of the compressor is improved.

Description

Technical Field

[0001] The utility model relates to a mechanical sealing device for a two-stage compression integrated compressor, and relates to the technical field of mechanical sealing. Background Art

[0002] Two-stage, integrated compressors are positive displacement compressors. Due to their simple structure, high volumetric efficiency, and stable, high pressure generation, they are widely used in various applications within the national economy. Mechanical seals are a key component. During operation, the rotors rotate relative to each other within the compressor body. The operation begins with suction, followed by compression of the gas within the sealed, elemental volume, before being discharged through the exhaust port. The drive-end rotor shaft passes through the compressor body, creating a gap. The pressure generated by the compressor, exceeding atmospheric pressure, forces the lubricating oil within the unit to leak through this gap. This oil leakage not only endangers the unit's normal operation, but also creates significant waste and pollutes the environment. Therefore, to ensure stable compressor operation, a mechanical seal is required to seal the lubricating oil and prevent leakage. Utility Model Content

[0003] The technical problem to be solved by the utility model is to provide a mechanical sealing device for a two-stage compression integrated compressor which can effectively reduce the leakage of lubricating oil and improve the sealing performance.

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

[0005] A mechanical seal device for a two-stage compression integrated compressor is installed on a matching main shaft, including a bearing, a dynamic ring assembly, a push ring, a static ring assembly, and a spring. The bearing is installed at the front end of the main shaft, and the dynamic ring assembly is composed of a dynamic ring and a dynamic ring seat that are interference fit and are installed on the main shaft in a ring sleeve and are located on the rear side of the bearing. The dynamic ring seat axially opens a plurality of spring holes for placing springs. The springs are placed in the spring holes and the push ring is pressed against one side of the bearing. The static ring assembly includes a static ring and a static ring seat and the ring sleeve is installed on the main shaft and is located on the rear side of the dynamic ring seat. The static ring and the dynamic ring slide and fit together to form an end face dynamic seal.

[0006] Preferably, the stationary ring is provided with a plurality of through holes axially penetrating the stationary ring.

[0007] Preferably, the main shaft is provided with a first cylindrical pin, and the dynamic ring seat is provided with a pin groove corresponding to the position of the first cylindrical pin, and the first cylindrical pin is inserted into the pin groove and clamped and fixed.

[0008] Preferably, a second cylindrical pin is provided on the outer side of the stationary ring, and an anti-rotation groove corresponding to the position of the second cylindrical pin is provided on the stationary ring seat, and the second cylindrical pin is inserted into the anti-rotation groove and clamped and fixed.

[0009] Preferably, an oil seal is provided between the stationary ring seat and the dynamic ring seat. The inner hole of the oil seal cooperates with the outer diameter of the dynamic ring to form a dynamic seal. A closed cavity is formed by the oil seal, the dynamic ring assembly, the stationary ring, and the stationary ring seat. An oil inlet and an oil return port connected to the closed cavity are opened on the outside of the stationary ring seat.

[0010] Preferably, a floating O-ring is provided between the stationary ring near the second cylindrical pin and the stationary ring seat.

[0011] Preferably, a groove for placing a sealing ring is opened in the inner hole of the static ring seat, thereby forming a static seal between the static ring and the static ring.

[0012] Preferably, a groove for placing a sealing ring is formed on the axial end surface of the static ring seat, thereby forming a static seal with the external cavity.

[0013] Compared with the prior art, the benefits of the present invention are as follows: the mechanical sealing device for the two-stage compression integrated compressor adopts a single-end face multi-spring structure, which has a simple structure and excellent compensation performance. The sealing end face bears the load evenly, and a number of through holes are opened axially in the static ring. The lubricating oil pressure keeps the static ring in a balanced state. When the pressure fluctuates or the dynamic ring compensation fails, it ensures that the dynamic and static ring sealing surfaces always remain in contact, forming a dynamic seal, improving the sealing performance, reducing lubricating oil leakage, and improving the operating stability of the compressor. BRIEF DESCRIPTION OF THE DRAWINGS

[0014] In order to more clearly illustrate the technical solutions in the embodiments of the present invention, the following briefly introduces the drawings required for use in the embodiments. Obviously, the drawings described below are only some embodiments of the present invention. Those skilled in the art can derive other drawings based on these drawings without inventive effort.

[0015] Figure 1 It is a side partial cross-sectional view of the utility model;

[0016] Among them: 1. Main shaft; 2. Bearing 2; 3. Push ring; 4. Spring; 5. Moving ring; 6. Moving ring seat; 7. Stationary ring; 8. Stationary ring seat; 9. Through hole; 10. First cylindrical pin; 11. Second cylindrical pin; 12. Oil seal; 13. Sealing cavity; 14. Oil inlet; 15. Oil return port; 16. O-ring; 17. Sealing ring; 18. External cavity. DETAILED DESCRIPTION

[0017] The following is a clear and complete description of the technical solutions in the embodiments of the present invention. Obviously, the embodiments described are only part of the embodiments of the present invention, not all of them. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the present invention:

[0018] like Figure 1 The mechanical sealing device for a two-stage compression integrated compressor shown is installed on a matching main shaft 1, and includes a bearing 2, a dynamic ring assembly, a push ring 3, a static ring assembly, and a spring 4. The bearing 2 is installed at the front end of the main shaft 1. In this embodiment, the front side of the main shaft 1 is the high-pressure side, and the rear end is the atmospheric side. The dynamic ring assembly is composed of a dynamic ring 5 and a dynamic ring seat 6 that are interference-fitted and are installed in a ring sleeve on the main shaft 1 and are located on the rear side of the bearing 2. The dynamic ring seat 6 axially opens a plurality of spring holes for placing the spring 4. The push ring 3 is sleeved on the main shaft 1 and is located on the rear side of the bearing 2. The spring 4 is placed in the spring hole and presses the push ring 3 against one side of the bearing 2, thereby effectively playing an axial positioning role.

[0019] The stationary ring assembly includes a stationary ring 7 and a stationary ring seat 8, and the uniform ring sleeve is installed on the main shaft 1 and is located on the rear side of the dynamic ring seat 6. The stationary ring 7 slides and fits with the dynamic ring 5 to form an end face dynamic seal. The spring 4 force of the spring 4 enables the dynamic ring 5 and the stationary ring 7 of the dynamic ring assembly to continuously fit and rotate relative to each other, effectively improving the compensation performance of the dynamic ring 5 and forming an end face dynamic seal.

[0020] In this embodiment, a plurality of through holes 9 are axially opened on the static ring 7 and pass through the static ring 7 axially. Therefore, the lubricating oil pressure keeps the static ring 7 in a balanced state. When the pressure fluctuates or the compensation of the dynamic ring 5 fails, it ensures that the sealing surfaces of the dynamic and static rings 7 always remain in contact, forming a dynamic seal and improving the sealing performance.

[0021] In this embodiment, the main shaft 1 is provided with a first cylindrical pin 10, and the dynamic ring seat 6 is provided with a pin groove corresponding to the position of the first cylindrical pin 10. The first cylindrical pin 10 is inserted into the pin groove and clamped and fixed. Therefore, the first cylindrical pin 10 can effectively transmit the torque between the main shaft 1 and the dynamic ring seat 6, maintaining operational stability. Furthermore, a second cylindrical pin 11 is provided on the outer side of the stationary ring 7, and the stationary ring seat 8 is provided with an anti-rotation groove corresponding to the position of the second cylindrical pin 11. The second cylindrical pin 11 is inserted into the anti-rotation groove and clamped and fixed. The second cylindrical pin 11 then effectively prevents rotation, improving the stability of the stationary ring 7 and the stationary ring seat 8 during operation.

[0022] In this embodiment, in order to further improve the lubrication performance, an oil seal 12 is provided between the static ring seat 8 and the dynamic ring seat 6. The inner hole of the oil seal 12 cooperates with the outer diameter of the dynamic ring 5 to form a dynamic seal. A closed cavity 13 is formed by the oil seal 12, the dynamic ring assembly, the static ring 7, and the static ring seat 8. An oil inlet 14 and an oil return port 15 connected to the closed cavity 13 are provided on the outside of the static ring seat 8. Therefore, when the compressor is actually running, the lubricating oil enters the closed cavity 13 from the oil inlet 14 and then into the oil return port 15, providing lubrication and cooling for the mechanical seal friction pair, thereby improving the lubrication effect and operating stability.

[0023] In this embodiment, a floating O-ring 16 is positioned between the stationary ring 7 and the stationary ring seat 8 near the second cylindrical pin 11, effectively absorbing vibrations and providing cushioning. A groove for a sealing ring 17 is defined within the inner bore of the stationary ring seat 8, forming a static seal with the stationary ring 7. Furthermore, a groove for the sealing ring 17 is defined on the axial end surface of the stationary ring seat 8, forming a static seal with the external cavity 18. This effectively enhances the sealing effectiveness of the overall sealing device, reduces lubricant leakage, and improves the operational stability of the device.

[0024] In actual application, the bearing 2, dynamic ring assembly, spring 4, push ring 3, oil seal 12, and static ring assembly are installed on the main shaft 1 in sequence, and the sealing rings 17 of each part are installed in place and fixed to the corresponding positions of the compressor. When the machine is started, the lubricating oil is injected from the oil inlet 14, and the lubricating oil enters the closed cavity 13 formed by the oil seal 12, dynamic ring assembly, static ring 7, and static ring seat 8, and then returns to the oil return port 15. In this process, the lubricating oil provides lubrication and cooling for the mechanical seal friction pair, effectively improving the stability of the overall sealing device and greatly reducing the leakage of lubricating oil. Moreover, the multi-spring 4 structure effectively improves the compensation performance of the dynamic ring 5, so that the sealing end face bears the load evenly. In addition, since several through holes 9 are opened axially on the static ring 7, the lubricating oil pressure can make the static ring 7 in a balanced state. When the pressure fluctuates or the compensation of the dynamic ring 5 fails, it can effectively ensure that the sealing surfaces of the dynamic and static rings 7 always remain in contact, forming a dynamic seal and improving the sealing performance.

[0025] It should be emphasized that the above are only preferred embodiments of the present invention and do not constitute any form of limitation to the present invention. Any simple modifications, equivalent changes and modifications made to the above embodiments based on the technical essence of the present invention are still within the scope of the technical solution of the present invention.

Claims

1. A mechanical seal device for a two-stage integrated compressor, mounted on a matching main shaft, characterized in that: It includes a bearing, a dynamic ring assembly, a push ring, a static ring assembly, and a spring. The bearing is installed at the front end of the main shaft. The dynamic ring assembly is composed of a dynamic ring and a dynamic ring seat that are interference fit and is installed in the main shaft and is located on the rear side of the bearing. The dynamic ring seat axially opens a plurality of spring holes for placing springs. The springs are placed in the spring holes and the push ring is pressed against one side of the bearing. The static ring assembly includes a static ring and a static ring seat and the ring sleeve is installed on the main shaft and is located on the rear side of the dynamic ring seat. The static ring and the dynamic ring slide and fit together to form an end face dynamic seal.

2. The mechanical seal device for a two-stage integrated compressor according to claim 1, characterized in that: The stationary ring is provided with a plurality of through holes axially penetrating the stationary ring.

3. The mechanical seal device for a two-stage integrated compressor according to claim 2, characterized in that: The main shaft is provided with a first cylindrical pin, and the dynamic ring seat is provided with a pin groove corresponding to the position of the first cylindrical pin. The first cylindrical pin is inserted into the pin groove and clamped and fixed.

4. The mechanical seal device for a two-stage integrated compressor according to claim 3, characterized in that: A second cylindrical pin is provided on the outer side of the stationary ring, and an anti-rotation groove corresponding to the position of the second cylindrical pin is provided on the stationary ring seat. The second cylindrical pin is inserted into the anti-rotation groove and clamped and fixed.

5. The mechanical seal device for a two-stage integrated compressor according to claim 4, characterized in that: An oil seal is provided between the stationary ring seat and the dynamic ring seat. The inner hole of the oil seal cooperates with the outer diameter of the dynamic ring to form a dynamic seal. A closed cavity is formed by the oil seal, the dynamic ring assembly, the stationary ring and the stationary ring seat. An oil inlet and an oil return port connected to the closed cavity are provided on the outside of the stationary ring seat.

6. The mechanical seal device for a two-stage integrated compressor according to claim 5, characterized in that: A floating O-ring is provided between the stationary ring near the second cylindrical pin and the stationary ring seat.

7. The mechanical seal device for a two-stage integrated compressor according to claim 5, characterized in that: The inner hole of the static ring seat is provided with a groove for placing the sealing ring, thereby forming a static seal with the static ring.

8. The mechanical seal device for a two-stage integrated compressor according to claim 5, characterized in that: The axial end surface of the stationary ring seat is provided with a groove for placing a sealing ring, thereby forming a static seal with the external cavity.

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