Mechanical seal capable of being used for working conditions of strong corrosion and strong abrasion

Abstract

The utility model relates to the technical field of mechanical seals, and discloses a mechanical seal capable of being used for strong-corrosion and strong-abrasion working conditions, which comprises a shaft sleeve, a clamping groove is arranged on one side of the shaft sleeve, a first sealing ring is fixedly arranged on the outer wall of the shaft sleeve, a static ring is fixedly arranged on the outer side of the shaft sleeve, and a flange is fixedly arranged on one side of the static ring. A pump cavity is formed in one side of the flange, a metal piece is fixedly installed on the outer side of the flange, a second sealing ring is fixedly installed on the outer side of the flange, a third sealing ring is fixedly installed on one side of the static ring, and a plurality of positioning bolts are arranged on one side of the metal piece. According to the mechanical seal capable of being used for the strong-corrosion and strong-abrasion working conditions, the silicon carbide ceramic, the sealing ring and the metal piece are in contact with a corrosive medium, the contact with the medium is avoided, corrosion and abrasion of the medium are avoided, the structure is exquisite, cost is low, applicability is high, installation and maintenance by a user are facilitated, the silicon carbide material is low in cost compared with hastelloy, and the production cost can be reduced.

Description

Technical Field

[0001] The utility model relates to the technical field of mechanical seals, in particular to a mechanical seal that can be used in strong corrosion and strong abrasion working conditions. Background Art

[0002] Mechanical seal is a device used to solve the sealing problem between the rotating shaft and the machine body. It relies on the elastic element to pre-tighten the dynamic and static ring end face sealing pair to achieve the axial end face sealing device, so it is also called end face seal. The basic elements of mechanical seal are: a flat end face sealing pair composed of a dynamic ring and a static ring, elastic elements, auxiliary seals, transmission parts, anti-rotation parts and fasteners. Among them, elastic elements generally refer to springs, bellows, diaphragms, etc., which mainly play the role of pre-tightening, compensation and buffering. It is required to always maintain sufficient elasticity to overcome the friction of auxiliary seals and transmission parts and the inertia of dynamic rings, etc., to ensure the good fit of the end face seal and the tracking of the dynamic ring.

[0003] In highly corrosive working conditions such as strong acid or very high chloride ion content, the more corrosion-resistant Hastelloy is generally selected as the mechanical seal matrix. However, Hastelloy is relatively expensive, the cost of mechanical seals remains high, and some Hastelloy cannot withstand such working conditions. In the existing technology, the general metal mechanical seal has a short life and poor practicality in the highly abrasive pump chamber environment. Summary of the invention

[0004] The technical problem to be solved by the utility model is to provide a mechanical seal that can be used in strong corrosion and strong abrasion working conditions, which can effectively solve the problems in the prior art that Hastelloy is relatively expensive, the cost of mechanical seals remains high, some working conditions that Hastelloy cannot tolerate, and the life of general metal mechanical seals is also short.

[0005] The technical solution adopted by the utility model is: a mechanical seal that can be used in strong corrosion and strong abrasion working conditions, including a sleeve, a slot is provided on one side of the sleeve, a sealing ring 1 is fixedly installed on the outer wall of the sleeve, a static ring is fixedly installed on the outer side of the sleeve, a flange is fixedly installed on one side of the static ring, a pump chamber is provided on one side of the flange, a metal part is fixedly installed on the outer side of the flange, a sealing ring 2 is fixedly installed on the outer side of the flange, a sealing ring 3 is fixedly installed on one side of the static ring, a plurality of positioning bolts are arranged on one side of the metal part, a liquid inlet is provided on one side of the metal part, an organic shaft is arranged inside the sleeve, a locking buckle is fixedly installed on one side of the metal part, a dynamic ring is arranged on one side of the sleeve, the dynamic ring and the flange are made of silicon carbide, a bump is fixedly installed on the inner wall of the dynamic ring, and the bump is matched with the slot.

[0006] Preferably, the flange is connected to the metal part via a lock buckle, the lock buckle is a flexible lock buckle, and the cross-section of the lock buckle is an "O"-shaped structure.

[0007] Through the above technical solution, when the mechanical seal is not installed on the pump, the flange and the metal part are flexibly locked together by the O-ring and cannot be separated, which solves the problem of combining the flange and the metal part together and improves the practicality of the overall device.

[0008] Preferably, the second sealing ring is a rubber sealing ring, and the second sealing ring is located at the connection between the flange and the pump chamber.

[0009] Through the above technical solution and the design of the rubber sealing ring 2, the flange can play a sealing role during the use of the pump chamber, thereby preventing the medium from corroding the mechanical sealing metal parts and extending their service life. The cooperation of the protrusion and the groove can make the sleeve and the moving ring fit together. At the same time, when rotating, the moving ring can be driven along with the sleeve to transmit the overall torque. The moving ring and flange made of silicon carbide can increase their service life under highly corrosive working conditions such as strong acid or very high chloride ion content, and can also protect the internal metal parts to prevent them from contacting the medium and preventing them from being corroded and eroded by the medium.

[0010] Preferably, a clamping ring is fixedly mounted on one side of the stationary ring, and the clamping ring is located at the connection between the dynamic ring and the shaft sleeve.

[0011] Through the above technical solution, the axial displacement of the silicon carbide dynamic ring and the mechanical seal sleeve is limited by an elastic clamping ring, so that the silicon carbide dynamic ring and the metal sleeve are flexibly limited to form a whole, which is convenient for transportation and installation. During operation, the pressure of the pump chamber can also press the silicon carbide dynamic ring on the sleeve to prevent it from being easily displaced and affecting normal sealing.

[0012] Compared with the prior art, the utility model provides a mechanical seal that can be used in strong corrosion and strong abrasion conditions, and has the following beneficial effects:

[0013] 1. This mechanical seal can be used in strong corrosion and strong abrasion working conditions. When the mechanical seal is not installed on the pump, the silicon carbide flange and the metal base of the mechanical seal are flexibly locked together by the O-ring and cannot be separated; it solves the problem of combining silicon carbide ceramics with metal parts. The silicon carbide flange and the pump cavity are sealed by the O-ring to prevent the medium from corroding the metal base of the mechanical seal. When the mechanical seal is installed on the pump, the silicon carbide flange is not subject to the locking force of the fastener and will not be broken. Under the action of the liquid pressure in the pump cavity, the silicon carbide flange is pressed on the metal base of the mechanical seal to achieve fixation. It has low cost and is easy to process. It does not affect the installation size of the original equipment, is convenient for users to replace and maintain, and increases the service life of the equipment, achieving multiple goals at one stroke;

[0014] 2. This mechanical seal can be used in strong corrosion and abrasion conditions. The silicon carbide ceramics and sealing rings are in contact with the corrosive medium, and the metal parts are prevented from contacting the medium, thus avoiding the corrosion and abrasion of the medium. It has a sophisticated structure, low cost, strong applicability, and is convenient for users to install and maintain. In addition, the cost of silicon carbide material is lower than that of Hastelloy, which can reduce production costs. BRIEF DESCRIPTION OF THE DRAWINGS

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

[0016] Figure 2 This is a schematic diagram of the three-dimensional structure of the shaft sleeve of the utility model;

[0017] Figure 3 This is a schematic diagram of the split structure of the shaft sleeve and the dynamic ring of the utility model;

[0018] Figure 4 The three-dimensional structure of the utility model is shown in FIG. Figure 1 ;

[0019] Figure 5 The three-dimensional structure of the utility model is shown in FIG. Figure 2 .

[0020] Among them: 1. Bushing; 2. Slot; 3. Moving ring; 4. Bump; 5. Sealing ring 1; 6. Stationary ring; 7. Flange; 8. Pump chamber; 9. Metal parts; 10. Sealing ring 2; 11. Retaining ring; 12. Sealing ring 3; 13. Positioning bolt; 14. Liquid inlet; 15. Machine shaft; 16. Lock. DETAILED DESCRIPTION

[0021] The following will be combined with the drawings in the embodiments of the utility model to clearly and completely describe the technical solutions in the embodiments of the utility model. Obviously, the described embodiments are only part of the embodiments of the utility model, not all of the embodiments. Based on the embodiments in the utility model, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the utility model.

[0022] Embodiment 1: Figure 1-5 As shown, the utility model provides a mechanical seal that can be used in strong corrosion and strong abrasion working conditions, including a sleeve 1, a slot 2 is opened on one side of the sleeve 1, a sealing ring 5 is fixedly installed on the outer wall of the sleeve 1, a static ring 6 is fixedly installed on the outer side of the sleeve 1, a flange 7 is fixedly installed on one side of the static ring 6, a pump chamber 8 is opened on one side of the flange 7, a metal part 9 is fixedly installed on the outer side of the flange 7, a sealing ring 2 10 is fixedly installed on the outer side of the flange 7, a sealing ring 3 12 is fixedly installed on one side of the static ring 6, a plurality of positioning bolts 13 are arranged on one side of the metal part 9, a liquid inlet 14 is opened on one side of the metal part 9, an organic shaft 15 is arranged inside the sleeve 1, and a lock buckle 16 is fixedly installed on one side of the metal part 9.

[0023] Specifically, the flange 7 is connected to the metal part 9 through a lock buckle 16. The lock buckle 16 is a flexible lock buckle, and the cross-section of the lock buckle 16 is an "O"-shaped structure. The advantage is that when the mechanical seal is not installed on the pump, the flange 7 and the metal part 9 are together through the O-ring flexible lock buckle 16 and cannot be separated, which solves the problem of combining the flange 7 and the metal part 9 together and improves the practicality of the overall device.

[0024] Specifically, the sealing ring 10 is a rubber sealing ring, and the sealing ring 10 is located at the connection between the flange 7 and the pump chamber 8. The advantage is that through the design of the rubber sealing ring 10, the flange 7 can play a sealing role during the use of the pump chamber 8, which can prevent the medium from corroding the mechanical sealing metal part 9 and extend its service life.

[0025] Specifically, a protrusion 4 is fixedly installed on the inner wall of the moving ring 3, and the protrusion 4 is adapted to the slot 2. The advantage is that the cooperation between the protrusion 4 and the slot 2 can make the sleeve 1 fit with the moving ring 3. At the same time, when rotating, the moving ring 3 can follow the sleeve 1 for transmission and transmit the overall torque.

[0026] Embodiment 2: Figure 2-5 As shown, as an improvement to the previous embodiment.

[0027] Specifically, a moving ring 3 is provided on one side of the sleeve 1, and the moving ring 3 and the flange 7 are made of silicon carbide. The advantage is that the moving ring 3 and the flange 7 made of silicon carbide can improve the service life of the moving ring 3 and the flange 7 under extremely corrosive working conditions such as strong acid or very high chloride ion content, and can also protect the internal metal parts 9 to prevent them from contacting the medium and preventing them from being corroded and eroded by the medium.

[0028] Specifically, a clamping ring 11 is fixedly installed on one side of the static ring 6, and the clamping ring 11 is located at the connection between the dynamic ring 3 and the sleeve 1. The advantage is that the axial displacement is limited by the silicon carbide dynamic ring 3 and the mechanical seal sleeve 1 through an elastic clamping ring 11, so that the silicon carbide dynamic ring 3 and the metal sleeve 1 are flexibly limited to form a whole, which is convenient for transportation and installation. During operation, the pressure of the pump chamber 8 can also press the silicon carbide dynamic ring 3 on the sleeve 1 to prevent it from being easily displaced and affecting normal sealing.

[0029] Working principle: When in use, when the mechanical seal is not installed on the pump, the flange 7 and the metal part 9 are connected together by the O-ring flexible lock 16 and cannot be separated, which solves the problem of combining the flange 7 and the metal part 9 and improves the practicality of the overall device. Through the design of the rubber sealing ring 10, the flange 7 can play a sealing role in the process of using the pump chamber 8, which can avoid the medium from corroding the mechanical seal metal part 9 and extend its service life. Through the cooperation of the protrusion 4 and the groove 2, the shaft sleeve 1 can fit with the dynamic ring 3. At the same time, when rotating, the dynamic ring 3 can follow the shaft sleeve 1 for transmission, and the overall torque can be transmitted. The moving ring 3 and flange 7 made of silicon carbide can improve the service life of the moving ring 3 and flange 7 under highly corrosive working conditions such as strong acid or very high chloride ion content, and can also protect the internal metal parts 9 to prevent them from contacting the medium and avoiding corrosion and abrasion of the medium. The silicon carbide moving ring 3 and the machine seal sleeve 1 are limited by an elastic clamping ring 11 to limit the axial displacement, so that the silicon carbide moving ring 3 and the metal sleeve 1 are flexibly limited to form a whole, which is convenient for transportation and installation. During operation, the pressure of the pump chamber 8 can also press the silicon carbide moving ring 3 on the sleeve 1 to prevent it from being easily displaced and affecting normal sealing.

[0030] Although the embodiments of the present invention have been shown and described, it will be appreciated by those skilled in the art that various changes, modifications, substitutions and variations may be made to the embodiments without departing from the principles and spirit of the present invention, and that the scope of the present invention is defined by the appended claims and their equivalents.

Claims

1. A mechanical seal that can be used in highly corrosive and abrasive working conditions, comprising a shaft sleeve (1), characterized in that: A slot (2) is provided on one side of the shaft sleeve (1); a sealing ring 1 (5) is fixedly mounted on the outer wall of the shaft sleeve (1); a stationary ring (6) is fixedly mounted on the outer side of the shaft sleeve (1); a flange (7) is fixedly mounted on one side of the stationary ring (6); a pump chamber (8) is provided on one side of the flange (7); a metal part (9) is fixedly mounted on the outer side of the flange (7); a sealing ring 2 (10) is fixedly mounted on the outer side of the flange (7); a sealing ring 3 (12) is fixedly mounted on one side of the stationary ring (6); a plurality of positioning bolts (13) are provided on one side of the metal part (9); a liquid inlet (14) is provided on one side of the metal part (9); an organic shaft (15) is provided inside the shaft sleeve (1); a locking buckle (16) is fixedly mounted on one side of the metal part (9); a moving ring (3) is provided on one side of the shaft sleeve (1); the moving ring (3) and the flange (7) are made of silicon carbide; a protrusion (4) is fixedly mounted on the inner wall of the moving ring (3); the protrusion (4) is matched with the slot (2).

2. A mechanical seal that can be used in strong corrosion and strong abrasion conditions according to claim 1, characterized in that: The flange (7) is connected to the metal part (9) via a lock buckle (16); the lock buckle (16) is a flexible lock buckle; and the cross section of the lock buckle (16) is an "O"-shaped structure.

3. A mechanical seal that can be used in strong corrosion and strong abrasion conditions according to claim 1, characterized in that: The second sealing ring (10) is a rubber sealing ring and is located at the connection between the flange (7) and the pump chamber (8).

4. The mechanical seal that can be used in strong corrosion and strong abrasion conditions according to claim 1 is characterized in that: A clamping ring (11) is fixedly mounted on one side of the stationary ring (6), and the clamping ring (11) is located at the connection between the dynamic ring (3) and the shaft sleeve (1).

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