High back pressure integrated double end face mechanical seal device for rotor pump

Abstract

The utility model relates to mechanical seal technical field discloses high back pressure integrated type double end face mechanical seal device for rotor pump, including shaft sleeve, medium side dynamic ring, medium side static ring, medium side push ring subassembly, medium side spring, gland, atmospheric side spring, atmospheric side static ring, atmospheric side dynamic ring and integrated limiting board, medium side dynamic ring cover is equipped in the shaft sleeve outer circumferential side surface, medium side push ring subassembly one end connects medium side static ring, medium side push ring subassembly other end connects the gland, is equipped with spring hole in the gland, medium side spring and atmospheric side spring all set up in the spring hole of gland, atmospheric side static ring is inserted in the gland, atmospheric side dynamic ring sets up on the shaft sleeve, integrated limiting board one end connects the gland. The utility model integrates double end face sealing structure as single module through integrated limiting board, reduces the component quantity, reduces assembly error. Medium side dynamic ring anti -rotation peg and atmospheric side dynamic ring anti -rotation peg synergies, ensure the stability under the high -speed rotation of dynamic ring.

Description

Technical Field

[0001] This utility model relates to the field of mechanical seal technology, specifically a high back pressure integrated double-end mechanical seal device for rotor pumps. Background Technology

[0002] Rotary lobe pumps are widely used in refining and chemical plants for conveying high-viscosity media. Due to their size, the sealing cavity space is small, with axial and radial dimensions much smaller than those of centrifugal pumps. When the P54 flushing scheme is selected for the seal, the seal must be arranged with two ends. Conventional seals cannot be installed, and a seal with a special structure and size is required to meet the installation requirements. This specially designed sealing structure uses external flow back pressure seals for both the media-side seal and the atmospheric-side seal. When the pressure of the fluid pumped is not less than 1 MPa, the pressure of the sealing fluid should not be less than 1.2 MPa. At this time, the back pressure difference of the media-side seal is not less than 0.2 MPa, while the back pressure difference of the atmospheric-side seal is not less than 1.1 MPa.

[0003] Existing sealing technologies cannot operate stably under conditions where the back pressure differential is not less than 0.4 MPa, especially under high back pressure (differential pressure not less than 1 MPa) conditions.

[0004] To address the high back pressure sealing problem, we propose a high back pressure integrated double-end mechanical seal device for rotor pumps. Utility Model Content

[0005] The purpose of this invention is to provide a high back pressure integrated double-end mechanical seal device for rotor pumps to solve the problems mentioned in the background art.

[0006] To achieve the above objectives, this utility model provides the following technical solution: a high back pressure integrated double-end mechanical seal device for rotor pumps, comprising a shaft sleeve, a medium-side moving ring, a medium-side stationary ring, a medium-side push ring assembly, a medium-side spring, a gland, an atmospheric-side spring, an atmospheric-side stationary ring, an atmospheric-side moving ring, and an integrated limiting plate;

[0007] The medium-side moving ring is sleeved on the outer circumferential side of the bushing; one end of the medium-side push ring assembly is connected to the medium-side stationary ring; the other end of the medium-side push ring assembly is connected to the pressure cap; the pressure cap has a spring hole; the medium-side spring and the atmospheric-side spring are both disposed in the spring hole of the pressure cap; the atmospheric-side stationary ring is inserted into the pressure cap; the atmospheric-side moving ring is disposed on the bushing; one end of the integrated limiting plate is connected to the pressure cap.

[0008] Preferably, the atmospheric side moving ring is provided with an atmospheric side moving ring limiting snap ring.

[0009] Preferably, the medium-side moving ring is connected to the bushing via a medium-side moving ring anti-rotation pin.

[0010] Preferably, the bushing is connected to the atmospheric side rotating ring via an atmospheric side rotating ring anti-rotation pin.

[0011] Preferably, the inner circumferential surface of the bushing is provided with a bushing seal ring; the outer circumferential surface of the bushing and the connecting surface of the medium-side moving ring are provided with a medium-side moving ring seal ring; the outer circumferential surface of the medium-side stationary ring is provided with a medium-side stationary ring seal ring; the outer circumferential surface of the atmospheric-side stationary ring is provided with an atmospheric-side stationary ring seal ring; and the inner circumferential surface of the atmospheric-side moving ring is provided with an atmospheric-side moving ring seal ring.

[0012] Preferably, the integrated limiting plate is hook-shaped.

[0013] Preferably, the integrated limiting plate is connected to the atmospheric side moving ring via integrated screws.

[0014] Compared with the prior art, the beneficial effects of this utility model are:

[0015] The unique structural design ensures sealing performance. The media-side moving ring adopts an L-shaped inlay structure and is installed on the outer circle of the bushing. Together with the anti-rotation pin of the media-side moving ring, it ensures synchronous rotation with the bushing, guaranteeing the stability and reliability of the seal.

[0016] The medium-side stationary ring adopts an integral ring design, and the medium-side push ring assembly is equipped with an anti-rotation pin. One end is inserted into the groove at the tail of the medium-side stationary ring, and the other end is inserted into the anti-rotation hole of the gland to prevent the stationary ring from rotating during operation and improve the sealing effect.

[0017] The atmospheric side static ring adopts a unique upward-facing structure inlay design, which is more resistant to high back pressure than existing inlay structures. The square pin at the tail is inserted into the anti-rotation groove of the gland to ensure that it does not rotate during operation, thus enhancing the sealing performance under high back pressure conditions.

[0018] The atmospheric side moving ring adopts a concave structure inlay design and is directly installed on the bushing. The atmospheric side moving ring anti-rotation pin is installed in the keyway of the bushing and the atmospheric side moving ring, which can transmit power to ensure synchronous rotation with the bushing and ensure the stability of the seal.

[0019] Both the medium-side spring and the atmospheric-side spring are installed in the spring holes of the gland, eliminating the need for the spring box in existing technology, simplifying the structure, and making installation and maintenance easier.

[0020] The integrated limiting plate adopts a hook-shaped design, which hooks into the annular groove at the tail of the gland. The atmospheric side moving ring limiting spring provides axial positioning for the atmospheric side moving ring. The two work together to achieve integrated sealing, making the entire sealing device structure more compact and reasonable. Attached Figure Description

[0021] Figure 1 This is a schematic diagram of the structure of this utility model.

[0022] In the diagram: 1-shaft sleeve, 2-medium-side moving ring seal, 3-shaft sleeve seal, 4-medium-side moving ring anti-rotation pin, 5-medium-side moving ring, 6-medium-side stationary ring, 7-medium-side stationary ring seal, 8-medium-side push ring assembly, 9-medium-side spring, 10-compression cap, 11-atmospheric-side spring, 12-atmospheric-side stationary ring seal, 13-atmospheric-side stationary ring, 14-atmospheric-side moving ring, 15-integrated limiting plate, 16-integrated screw, 17-atmospheric-side moving ring seal, 18-atmospheric-side moving ring anti-rotation pin, 19-atmospheric-side moving ring limiting snap ring. Detailed Implementation

[0023] 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.

[0024] Please see Figure 1 This utility model provides a technical solution: a high back pressure integrated double-end mechanical seal device for rotor pumps, including a shaft sleeve 1, a medium-side moving ring 5, a medium-side stationary ring 6, a medium-side push ring assembly 8, a medium-side spring 9, a pressure cover 10, an atmospheric-side spring 11, an atmospheric-side stationary ring 13, an atmospheric-side moving ring 14, and an integrated limiting plate 15. Each component is assembled sequentially on the rotor pump shaft end to form a double-end sealing structure.

[0025] The medium-side moving ring 5 is sleeved on the outer circumferential side of the bushing 1 and fixed by the medium-side moving ring anti-rotation pin 4 to prevent rotational deviation.

[0026] One end of the medium-side push ring assembly 8 is connected to the medium-side stationary ring 6, and the other end is connected to the pressure cap 10, transmitting spring force to make the stationary ring and the moving ring fit tightly together.

[0027] The medium-side spring 9 is placed inside the spring hole of the pressure cap 10 to provide initial preload.

[0028] The atmospheric side stationary ring 13 is inserted into the pressure cover 10, and the atmospheric side moving ring 14 is set on the bushing 1. The two are pressed together by the atmospheric side spring 11.

[0029] The atmospheric side moving ring 14 is connected to the bushing 1 through the atmospheric side moving ring anti-rotation pin 18 to prevent loosening during high-speed rotation.

[0030] The atmospheric side moving ring limiting snap ring 19 is set on the end face of the atmospheric side moving ring 14 to limit its axial displacement.

[0031] The integrated limiting plate 15 adopts a hook-shaped structure. One end of the integrated limiting plate 15 is connected to the pressure cover 10, and the other end of the integrated limiting plate 15 is fixed to the atmospheric side moving ring 14 by the integrated screw 16, so as to realize axial limiting and structural integration.

[0032] The bushing seal ring 3, the medium-side moving ring seal ring 2, the medium-side stationary ring seal ring 7, the atmospheric-side stationary ring seal ring 12, and the atmospheric-side moving ring seal ring 17 are respectively installed on the connection surfaces of each component to form a multi-level sealing barrier.

[0033] This utility model integrates the double-end sealing structure into a single module by integrating the limiting plate 15, thereby reducing the number of parts and reducing assembly errors.

[0034] The anti-rotation pin 4 on the medium side of the moving ring and the anti-rotation pin 18 on the atmospheric side work together to ensure the stability of the moving ring under high-speed rotation.

[0035] The double-end sealing structure, combined with multi-stage sealing rings, can withstand the high back pressure difference between the outlet and inlet of the rotor pump.

[0036] The applicable working conditions of this utility model are as follows:

[0037] Speed ​​< 3000 RPM;

[0038] Atmospheric side sealing back pressure ≤2MPa;

[0039] Temperature ≤260℃.

[0040] Figure 1 In the diagram, a is the outlet of the isolation fluid; b is the inlet of the isolation fluid; c is the medium side; and d is the atmospheric side.

[0041] Working principle:

[0042] High-pressure medium enters the medium-side sealing surface from the rotor pump outlet. The medium-side spring 9 and the medium pressure work together to make the medium-side moving ring 5 and the medium-side stationary ring 6 fit tightly together to prevent medium leakage.

[0043] The atmospheric side spring 11 presses the atmospheric side moving ring 14 and the atmospheric side stationary ring 13 to prevent air from entering the pump body;

[0044] The integrated limit plate 15 restricts the axial displacement of the atmospheric side moving ring 14, and the double anti-rotation pins prevent the moving ring from rotating and deviating, ensuring long-term operational stability.

[0045] It will be apparent to those skilled in the art that this invention is not limited to the details of the exemplary embodiments described above, and that it can be implemented in other specific forms without departing from the spirit or essential characteristics of this invention. Therefore, the embodiments should be considered illustrative and non-limiting in all respects, and the scope of this invention is defined by the appended claims rather than the foregoing description. Thus, it is intended that all variations falling within the meaning and scope of equivalents of the claims be included within this invention. No reference numerals in the claims should be construed as limiting the scope of the claims.

[0046] Furthermore, it should be understood that although this specification describes embodiments, not every embodiment contains only one independent technical solution. This narrative style is merely for clarity. Those skilled in the art should consider the specification as a whole, and the technical solutions in each embodiment can also be appropriately combined to form other embodiments that can be understood by those skilled in the art.

Claims

1. A high back pressure integrated double-end mechanical seal device for rotor pumps, characterized in that, Includes bushing (1), medium-side moving ring (5), medium-side stationary ring (6), medium-side push ring assembly (8), medium-side spring (9), pressure cap (10), atmospheric-side spring (11), atmospheric-side stationary ring (13), atmospheric-side moving ring (14), and integrated limiting plate (15). The medium-side moving ring (5) is sleeved on the outer circumferential side of the bushing (1); one end of the medium-side push ring assembly (8) is connected to the medium-side stationary ring (6); the other end of the medium-side push ring assembly (8) is connected to the pressure cap (10); the pressure cap (10) is provided with a spring hole; the medium-side spring (9) and the atmospheric-side spring (11) are both provided in the spring hole of the pressure cap (10); the atmospheric-side stationary ring (13) is inserted into the pressure cap (10); the atmospheric-side moving ring (14) is provided on the bushing (1); one end of the integrated limiting plate (15) is connected to the pressure cap (10).

2. The high back pressure integrated double-end mechanical seal device for rotor pumps according to claim 1, characterized in that, The atmospheric side moving ring (14) is provided with an atmospheric side moving ring limiting snap ring (19).

3. The high back pressure integrated double-end mechanical seal device for rotor pumps according to claim 1, characterized in that, The medium-side moving ring (5) is connected to the bushing (1) through the medium-side moving ring anti-rotation pin (4).

4. The high back pressure integrated double-end mechanical seal device for rotor pumps according to claim 1, characterized in that, The bushing (1) is connected to the atmospheric side moving ring (14) via the atmospheric side moving ring anti-rotation pin (18).

5. The high back pressure integrated double-end mechanical seal device for rotor pumps according to claim 1, characterized in that, The inner circumference of the bushing (1) is provided with a bushing seal ring (3); the outer circumference of the bushing (1) and the connecting surface of the medium-side moving ring (5) are provided with a medium-side moving ring seal ring (2); the outer circumference of the medium-side stationary ring (6) is provided with a medium-side stationary ring seal ring (7); the outer circumference of the atmospheric-side stationary ring (13) is provided with an atmospheric-side stationary ring seal ring (12); the inner circumference of the atmospheric-side moving ring (14) is provided with an atmospheric-side moving ring seal ring (17).

6. The high back pressure integrated double-end mechanical seal device for rotor pumps according to claim 1, characterized in that, The integrated limiting plate (15) is hook-shaped.

7. The high back pressure integrated double-end mechanical seal device for rotor pumps according to claim 6, characterized in that, The integrated limiting plate (15) is connected to the atmospheric side moving ring (14) by an integrated screw (16).

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