Mechanical sealing device for three-end-face corrugated pipe

Abstract

The utility model relates to the technical field of corrugated pipe mechanical sealing devices, and discloses a three-end-face corrugated pipe mechanical sealing device which comprises a first corrugated pipe assembly, a first movable ring, a first gland, a second corrugated pipe assembly, a second movable ring, a flow guide sleeve, a third corrugated pipe assembly, a static ring and a shaft sleeve. A first cavity is formed among the first corrugated pipe assembly, the first movable ring and the side wall of the shaft sleeve, a second cavity is formed among the third corrugated pipe assembly, the static ring, the first gland, the first corrugated pipe assembly and the first movable ring, and a third cavity is formed among the second corrugated pipe assembly, the second movable ring, the third corrugated pipe assembly and the static ring. The side wall of the second cavity and the side wall of the third cavity are each provided with a connector. According to the three-end-face corrugated pipe mechanical sealing device, the mode that the second corrugated pipe set and the third corrugated pipe set are arranged in the radial direction of the circumference of the section of the three-end-face corrugated pipe mechanical sealing device in an overlapped mode is adopted, the third corrugated pipe set is added while the overall axial distance of the sealing is not increased, and the three-end-face corrugated pipe mechanical sealing device is formed.

Description

Technical Field

[0001] This utility model relates to the technical field of bellows mechanical seal devices, specifically a three-end-face bellows mechanical seal device. Background Technology

[0002] Mechanical seals are used for dynamic sealing of the extended shafts of rotating equipment such as pumps and compressors. When conveying flammable, explosive, toxic, or harmful media, multiple isolation measures are required to ensure safe operation and prevent media leakage that could pollute the environment. This involves adding multiple mechanical seal facets to the mechanical seal to form a combined sealing device, with independent chambers containing isolation fluids and buffer solutions. The pressure, level, and temperature of the isolation fluids and buffer solutions are monitored in real time to obtain the operating status of the mechanical seal device. Changes in various parameters are promptly controlled and addressed to prevent problems from occurring, thereby effectively ensuring zero leakage of the media and stable operation of the equipment.

[0003] To address the aforementioned issues, we propose a three-end-face bellows mechanical seal device. Utility Model Content

[0004] The purpose of this invention is to provide a three-end-face bellows mechanical seal device to solve the problems mentioned in the background art.

[0005] To achieve the above objectives, this utility model provides the following technical solution: a three-end-face bellows mechanical seal device, comprising a first bellows assembly, a first rotating ring, a first gland, a second bellows assembly, a second rotating ring, a flow guide sleeve, a third bellows assembly, a stationary ring, and a bushing;

[0006] The first bellows assembly, the first moving ring, the second bellows assembly, the second moving ring, and the third bellows assembly are all sleeved on the outer side of the bushing; one end face of the first bellows assembly abuts against the side wall of the first gland; the other end face of the first bellows assembly abuts against one end face of the first moving ring; the other end face of the first moving ring abuts against the side wall of the first gland; one end face of the second moving ring abuts against one end face of the second bellows assembly; one end of the third bellows assembly abuts against the stationary ring; the flow guide sleeve is sleeved on the second bellows assembly; the stationary ring is sleeved on the flow guide sleeve;

[0007] A first cavity is formed between the first bellows assembly, the first moving ring, and the side wall of the bushing; a second cavity is formed between the third bellows assembly, the stationary ring, the first pressure cap, the first bellows assembly, and the first moving ring; a third cavity is formed between the second bellows assembly, the second moving ring, the third bellows assembly, and the stationary ring; and interfaces are provided on the side walls of both the second and third cavities.

[0008] Preferably, it also includes a first dynamic ring seal, a sealing gasket, a second dynamic ring seal, and a sealing ring;

[0009] A sealing gasket is provided between the first bellows assembly and the first gland; a first moving ring sealing ring is provided between the first moving ring and the bushing; a second moving ring sealing ring is provided between the second moving ring and the bushing; and a sealing ring is provided between the third bellows assembly and the bushing.

[0010] Preferably, a second pressure cap is fitted on the outer wall of the stationary ring; a stationary ring sealing ring is provided between the second pressure cap and the stationary ring; the stationary ring is connected to the second pressure cap by an anti-rotation pin.

[0011] Preferably, the first bellows assembly is connected to the first gland by a first screw; the first moving ring is connected to the bushing by a first drive pin; the second moving ring is connected to the bushing by a second drive pin; the third bellows assembly is connected to the bushing by a second screw; and the stationary ring is connected to the second gland by an anti-rotation pin.

[0012] Compared with the prior art, the beneficial effects of this utility model are: the three-end-face bellows mechanical seal device adopts the method of superimposing the second bellows group and the third bellows group along the circumferential radial direction of the cross section of this application, and adds the third bellows group without increasing the overall axial distance of the seal, thus forming a three-end-face bellows mechanical seal device. Attached Figure Description

[0013] Figure 1 This is a schematic diagram of the structure of this utility model.

[0014] In the figure: 1-First bellows assembly, 2-First moving ring, 3-First moving ring seal, 4-First transmission pin, 5-First screw, 6-First gland, 7-Sealing gasket, 8-Second bellows assembly, 9-Second moving ring, 10-Second moving ring seal, 11-Second transmission pin, 12-Guide sleeve, 13-Third bellows assembly, 14-Stationary ring, 15-Stationary ring seal, 16-Anti-rotation pin, 17-Second gland, 18-Sealing ring, 19-Second screw, 20-Shaft sleeve, 21-First cavity, 22-Second cavity, 23-Third cavity. Detailed Implementation

[0015] 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.

[0016] Please see Figure 1 This utility model provides a technical solution: a three-end-face bellows mechanical seal device, including a first bellows assembly 1, a first moving ring 2, a first pressure cap 6, a second bellows assembly 8, a second moving ring 9, a flow guide sleeve 12, a third bellows assembly 13, a stationary ring 14, and a bushing 20.

[0017] The first bellows assembly 1, the first moving ring 2, the second bellows assembly 8, the second moving ring 9, and the third bellows assembly 13 are all sleeved on the outer side of the bushing 20. One end face of the first bellows assembly 1 abuts against the side wall of the first pressure cap 6, the other end face of the first bellows assembly 1 abuts against one end face of the first moving ring 2, the other end face of the first moving ring 2 abuts against the side wall of the first pressure cap 6, one end face of the second moving ring 9 abuts against one end face of the second bellows assembly 8, and one end of the third bellows assembly 13 abuts against the stationary ring 14. The flow guide sleeve 12 is sleeved on the second bellows assembly 8, and the stationary ring 14 is sleeved on the flow guide sleeve 12.

[0018] A first cavity 21 is formed between the first bellows assembly 1, the first moving ring 2 and the side wall of the bushing 20. A second cavity 22 is formed between the third bellows assembly 13, the stationary ring 14, the first pressure cap 6, the first bellows assembly 1 and the first moving ring 2. A third cavity 23 is formed between the second bellows assembly 8, the second moving ring 9, the third bellows assembly 13 and the stationary ring 14. Both the side walls of the second cavity 22 and the third cavity 23 are provided with interfaces.

[0019] The first bellows assembly 1 forms a seal by fitting the end face of the first moving ring 2 together, forming a first cavity 21 between it and the side wall of the bushing 20; the third bellows assembly 13 forms a second seal by fitting the stationary ring 14 together, forming a second cavity 22 between it and the pressure cap 6, the first bellows assembly 1, and the first moving ring 2; the second bellows assembly 8 forms a third seal by fitting the second moving ring 9 together, forming a third cavity 23 between it and the third bellows assembly 13 and the stationary ring 14.

[0020] The first chamber 21 is used to transport the medium for the entire device, while the second chamber 22 and the third chamber 23 are independent chambers connected to the external auxiliary system. When connected, they form a pressureless or pressurized circulation protection system, ensuring that the medium in the first chamber 21 does not leak into the atmosphere. Due to the isolation provided by the two chambers 22 and 23, the leakage of the medium is minimized, greatly improving the overall safety of the device's operation.

[0021] Furthermore, it also includes a first dynamic ring seal 3, a sealing gasket 7, a second dynamic ring seal 10, and a sealing ring 18.

[0022] A sealing gasket 7 is provided between the first bellows assembly 1 and the first pressure cap 6, a first moving ring sealing ring 3 is provided between the first moving ring 2 and the bushing 20, a second moving ring sealing ring 10 is provided between the second moving ring 9 and the bushing 20, and a sealing ring 18 is provided between the third bellows assembly 13 and the bushing 20.

[0023] Furthermore, a second pressure cap 17 is fitted on the outer wall of the stationary ring 14, and a stationary ring sealing ring 15 is provided between the second pressure cap 17 and the stationary ring 14. The stationary ring 14 is connected to the second pressure cap 17 through an anti-rotation pin 16.

[0024] Furthermore, the first bellows assembly 1 is connected to the first pressure cap 6 by the first screw 5, the first moving ring 2 is connected to the bushing 20 by the first transmission pin 4, the second moving ring 9 is connected to the bushing 20 by the second transmission pin 11, the third bellows assembly 13 is connected to the bushing 20 by the second screw 19, and the stationary ring 14 is connected to the second pressure cap 17 by the anti-rotation pin 16.

[0025] like Figure 1 As shown, the bushing 20 is mounted on the equipment shaft and rotates synchronously with the shaft. The first rotating ring 2, with the first rotating ring seal 3, is installed onto the corresponding part of the bushing 20, ensuring that the first drive pin 4 on the bushing 20 aligns with the slot on the first rotating ring 2. The second rotating ring 9, with the second rotating ring seal 10, is installed onto the corresponding part of the bushing 20, ensuring that the second drive pin 11 aligns with the slot on the second rotating ring 9. The third bellows assembly 13, with the seal 18, is also fitted onto the corresponding position of the bushing 20 and secured with the second screw 19. The first bellows assembly 1, along with the sealing gasket 7, is installed onto the first pressure cap 6 and secured with the first screw 5. The stationary ring 14, along with the stationary ring sealing ring 15, is installed onto the second pressure cap 17, and the anti-rotation pin 16 is engaged with the groove of the stationary ring 14. The first pressure cap 6, with the bellows assembly 1, is then installed on the left side of the bushing 20, forming a friction pair end face fit between the bellows assembly 1 and the first moving ring 2. The second pressure cap 17, with the stationary ring 14, is then installed on the right side of the bushing, forming a friction pair end face fit between the third bellows assembly 13 and the stationary ring 14, and is installed together with the first pressure cap 6. The second bellows assembly 8, with the guide sleeve 12, is installed from the right side of the bushing 20 onto the second pressure cap 17, simultaneously ensuring that its friction pair end face fits against the end face of the second moving ring 9.

[0026] The first bellows assembly 1, the second bellows assembly 8, and the third bellows assembly 13 are all welded together from a ring head, a tailstock, and a metal bellows. The tailstock of the second bellows assembly 8 also functions as an external pressure cap.

[0027] The first bellows assembly 1 and the end face of the first moving ring 2 are fitted together to form a seal. The third bellows assembly 13 and the stationary ring 14 are fitted together to form a second seal. The second bellows assembly 8 and the second moving ring 9 are fitted together to form a third seal.

[0028] The second cavity 22 has an interface on its side wall for connection with the external auxiliary system, forming a pressurized or unpressurized system circulation. The third cavity 23 has an interface on its side wall for connection with the external auxiliary system. With the addition of the flow guide sleeve 12, the coolant can be guided to the vicinity of the friction pair end faces of the second and third seals, effectively removing frictional heat.

[0029] This invention employs a method in which the second bellows assembly 8 and the third bellows assembly 13 are stacked along the radial direction of the cross-section of this application. The addition of the third bellows assembly 13 without increasing the overall axial distance of the seal forms a three-end-face bellows mechanical seal device.

[0030] 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.

[0031] 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 three-end-face bellows mechanical seal device, characterized in that, It includes a first bellows assembly (1), a first moving ring (2), a first gland (6), a second bellows assembly (8), a second moving ring (9), a flow guide sleeve (12), a third bellows assembly (13), a stationary ring (14), and a bushing (20); The first bellows assembly (1), the first moving ring (2), the second bellows assembly (8), the second moving ring (9), and the third bellows assembly (13) are all sleeved on the outer side of the bushing (20); one end face of the first bellows assembly (1) abuts against the side wall of the first pressure cap (6); the other end face of the first bellows assembly (1) abuts against one end face of the first moving ring (2); the other end face of the first moving ring (2) abuts against the side wall of the first pressure cap (6); one end face of the second moving ring (9) abuts against one end face of the second bellows assembly (8); one end of the third bellows assembly (13) abuts against the stationary ring (14); the flow guide sleeve (12) is sleeved on the second bellows assembly (8); the stationary ring (14) is sleeved on the flow guide sleeve (12); A first cavity (21) is formed between the first bellows assembly (1), the first moving ring (2), and the side wall of the bushing (20); a second cavity (22) is formed between the third bellows assembly (13), the stationary ring (14), the first pressure cap (6), the first bellows assembly (1), and the first moving ring (2); a third cavity (23) is formed between the second bellows assembly (8), the second moving ring (9), the third bellows assembly (13), and the stationary ring (14); both the side wall of the second cavity (22) and the side wall of the third cavity (23) are provided with interfaces.

2. The three-end-face bellows mechanical seal device according to claim 1, characterized in that, It also includes a first dynamic ring seal (3), a sealing gasket (7), a second dynamic ring seal (10), and a sealing ring (18); A sealing gasket (7) is provided between the first bellows assembly (1) and the first pressure cap (6); a first moving ring sealing ring (3) is provided between the first moving ring (2) and the bushing (20); a second moving ring sealing ring (10) is provided between the second moving ring (9) and the bushing (20); and a sealing ring (18) is provided between the third bellows assembly (13) and the bushing (20).

3. The three-end-face bellows mechanical seal device according to claim 1, characterized in that, The outer wall of the stationary ring (14) is fitted with a second pressure cap (17); a stationary ring sealing ring (15) is provided between the second pressure cap (17) and the stationary ring (14); the stationary ring (14) is connected to the second pressure cap (17) by an anti-rotation pin (16).

4. A three-end-face bellows mechanical seal device according to claim 3, characterized in that, The first bellows assembly (1) is connected to the first gland (6) by the first screw (5); the first moving ring (2) is connected to the bushing (20) by the first transmission pin (4); the second moving ring (9) is connected to the bushing (20) by the second transmission pin (11); the third bellows assembly (13) is connected to the bushing (20) by the second screw (19); and the stationary ring (14) is connected to the second gland (17) by the anti-rotation pin (16).

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