External mechanical sealing structure
By setting an anode ring and electrolyte solution on the mechanical sealing surface and using electrochemical reactions to prevent corrosion protection, the problem of limited selection of traditional sealing materials is solved, and a lower cost and efficient sealing effect is achieved, and it is suitable for high-temperature and high-pressure environments.
Patent Information
- Application Number
- CN202420399332.0
- Authority / Receiving Office
- CN · China
- Patent Type
- Utility models(China)
- Current Assignee / Owner
- Filing Date
- 2024-03-01
- Publication Date
- 2024-12-13
- Estimated Expiration
- 2034-03-01
AI Technical Summary
The selection of traditional mechanical sealing materials is limited by corrosion resistance, resulting in high manufacturing costs and high maintenance costs, which cannot meet the requirements of high temperature and high pressure environments.
Using an external mechanical sealing structure, the anode ring and electrolyte solution are provided on the sealing surface, and the electrochemical reaction is used to form a closed circuit for corrosion protection, allowing the use of more common and cheaper metal materials, and through hydraulic and sealed slip ring structures Achieving axial limiting and sealing effects.
It reduces the manufacturing cost of seals, improves corrosion resistance, reduces maintenance costs, and achieves effective sealing in high-temperature and high-pressure environments, and can be replaced or repaired regularly as needed.
Smart Images
Figure CN222163549U_ABST
Abstract
Description
Technical Field
[0001] The utility model relates to the technical field of mechanical seals, in particular to an externally mounted mechanical seal structure. Background Art
[0002] Traditional mechanical seals are usually made of corrosion-resistant materials to improve their corrosion resistance. However, this method has the following disadvantages: traditional mechanical seals need to be made of corrosion-resistant materials, which are usually expensive, resulting in increased manufacturing costs; the material selection of traditional mechanical seals is limited by corrosion resistance and may not meet the requirements under specific working conditions, such as high temperature and high pressure environments; once a traditional mechanical seal fails or is damaged, it is usually necessary to replace the entire sealing device, which has high maintenance costs. In view of this, the existing problems are studied and improved, and an external mechanical seal structure is provided to solve the current problems, aiming to achieve the purpose of solving problems and improving practical value through this technology. Utility Model Content
[0003] The utility model aims to solve one of the technical problems existing in the prior art or related technology.
[0004] To this end, the technical solution adopted by the utility model is: an external mechanical sealing structure, including: a first ring seat, a second ring seat, a pressure-containing cavity is provided on the inner side of the first ring seat and the second ring seat, and the first slip ring and the second slip ring which are rotatably sleeved on the surface of the shaft sleeve are slidably installed on the inner side of the pressure-containing cavity, the inner side of the first slip ring is slidably sleeved and fixed to the moving ring on the surface of the shaft sleeve, the other end of the moving ring is provided with a sliding ring which is slidably abutted on the surface of the second slip ring, the surfaces of the first ring seat and the second ring seat are both provided with liquid inlets, and the pressure-containing cavity is filled with an electrolyte solution, the inner side of the pressure-containing cavity is provided with an anode ring, the surface of the shaft sleeve is rotatably sleeved with a locking ring sleeve, and the bottom surface of the locking ring sleeve is slidably fitted with the top surface of the pressure-containing cavity.
[0005] In a preferred example, the utility model can be further configured as follows: the hydraulic pressure of the electrolyte solution inside the first ring seat acts on the top surface of the second slip ring relative to the bottom surface of the second ring seat, the hydraulic pressure of the electrolyte solution inside the second ring seat acts on the top surface of the first slip ring relative to the top surface of the first ring seat, and the movable ring is slidably sleeved on the inner side of the first slip ring.
[0006] In a preferred example, the utility model can be further configured as follows: the moving ring is a polytetrachloroethylene slip ring structure and is fixed to the surface of the shaft sleeve.
[0007] In a preferred example, the utility model can be further configured as follows: the bottom surfaces of the second ring seat and the pressure cover are both provided with sealing pressure rings, the second ring seat and the top surfaces of the first ring seat are in contact with each other, the pressure cover and the top surfaces of the second ring seat are in contact with each other, the top end of the shaft sleeve is provided with an edge for blocking the locking ring sleeve, the locking ring sleeve is rotatably sleeved on the surface of the shaft sleeve and slidably abuts against the top surface of the pressure cover, and the bottom end of the shaft sleeve is rotatably sleeved with a flange plate in contact with the bottom surface of the first ring seat.
[0008] In a preferred example, the utility model can be further configured as follows: the anode ring is embedded and installed on the inner side of the gland member and is in close contact with the top surface of the second ring seat, and the anode ring is one of a zinc ring and a tin ring.
[0009] In a preferred example, the utility model can be further configured as follows: the surfaces of the second slip ring and the moving ring are both provided with sealing slip rings, and the sealing slip ring on the surface of the second slip ring is interference fit with the inner side of the first ring seat, and the sealing slip ring on the surface of the moving ring is sliding fit with the inner side of the first slip ring.
[0010] In a preferred example, the utility model can be further configured as follows: the locking ring sleeve is a hoop structure with an opening, and the end of the hoop is provided with a connecting ear and connected by a tightening action of a screw rod.
[0011] The beneficial effects achieved by the utility model are:
[0012] 1. In the utility model, by setting an external gland and an anode ring structure, the mechanical seal utilizes the principle of sacrificial anode, and an anode ring is set on the surface of the mechanical seal to form galvanic cell protection, which is no longer limited by the corrosion resistance of the material. More common and cheaper metal materials can be selected as the seal substrate, which reduces the manufacturing cost and improves the corrosion resistance of the seal. It can be replaced or repaired regularly as needed, and the maintenance cost is low.
[0013] 2. In the utility model, by arranging liquid inlets on the surfaces of the first ring seat and the second ring seat and filling them with electrolyte solution, on the one hand, the hydraulic pressure of the filled liquid is used as the axial pressure to push the first slip ring and the second slip ring to axially limit the shaft sleeve to avoid axial movement of the mechanical seal, and on the other hand, the conductive property of the electrolyte solution is used to provide a conductive medium and maintain the electrochemical reaction. In the electrochemical process, the anode ring as the anode material and the cathode material formed by the seal substrate will conduct current through the ions in the electrolyte solution, thereby forming a closed circuit, which provides overall corrosion protection for the seal substrate. BRIEF DESCRIPTION OF THE DRAWINGS
[0014] Figure 1 This is a schematic diagram of the overall structure of an embodiment of the utility model;
[0015] Figure 2It is a partial cross-sectional structural schematic diagram of an embodiment of the utility model;
[0016] Figure 3 For an embodiment of the utility model Figure 2 A schematic diagram of the structure at A;
[0017] Figure 4 The present invention is a schematic structural diagram of a shaft sleeve, a locking ring sleeve and an anode ring according to an embodiment of the present invention.
[0018] Reference numerals:
[0019] 1. First ring seat; 2. Second ring seat; 3. Gland; 4. Shaft sleeve; 5. Locking ring; 6. Anode ring; 11. Liquid inlet; 12. Pressure chamber; 13. First slip ring; 14. Second slip ring; 15. Moving ring; 16. Retaining slip ring. DETAILED DESCRIPTION
[0020] In order to make the purpose, technical solution and advantages of the utility model clearer, the utility model is further described in detail below in combination with specific implementation methods and with reference to the accompanying drawings. It should be noted that the embodiments of the utility model and the features in the embodiments can be combined with each other without conflict.
[0021] An external mechanical seal structure provided by some embodiments of the utility model is described below in conjunction with the accompanying drawings.
[0022] Combination Figure 1-4 As shown, the utility model provides an external mechanical seal structure, comprising: a first ring seat 1, a second ring seat 2, a gland member 3 and a shaft sleeve 4, a pressure-containing cavity 12 is provided on the inner side of the first ring seat 1 and the second ring seat 2, and a first slip ring 13 and a second slip ring 14 rotatably sleeved on the surface of the shaft sleeve 4 are slidably installed on the inner side of the pressure-containing cavity 12, the inner side of the first slip ring 13 is slidably sleeved and fixed to the surface of the shaft sleeve 4 with a moving ring 15, the other end of the moving ring 15 is provided with a sliding ring 16 slidably abutted on the surface of the second slip ring 14, a liquid inlet 11 is provided on the surface of the first ring seat 1 and the second ring seat 2, and the inside of the pressure-containing cavity 12 is filled with an electrolyte solution, an anode ring 6 is provided on the inner side of the gland member 3, a locking ring sleeve 5 is rotatably sleeved on the surface of the shaft sleeve 4, and the bottom surface of the locking ring sleeve 5 is slidably fitted with the top surface of the gland member 3.
[0023] In this embodiment, the hydraulic pressure of the electrolyte solution inside the first ring seat 1 acts on the top surface of the second slip ring 14 relative to the bottom surface of the second ring seat 2, and the hydraulic pressure of the electrolyte solution inside the second ring seat 2 acts on the top surface of the first slip ring 13 relative to the top surface of the first ring seat 1, and the movable ring 15 is slidably sleeved on the inner side of the first slip ring 13.
[0024] Specifically, the electrolyte solution hydraulic pressure acts on the surfaces of the first slip ring 13 and the second slip ring 14 to form a thrust, and the position between the first slip ring 13 and the second slip ring 14 is limited, thereby indicating the axial offset of the moving ring 15 and the shaft sleeve 4 .
[0025] In this embodiment, the dynamic ring 15 is a polytetrachloroethylene slip ring structure and is fixed to the surface of the shaft sleeve 4 .
[0026] Specifically, the dynamic ring 15 is used to rotate synchronously with the shaft sleeve 4 between the first slip ring 13 and the second slip ring 14. The first slip ring 13 and the second slip ring 14 are stationary relative to the movement of the shaft sleeve 4, thereby providing radial support for the shaft sleeve 4 to stabilize its rotational movement.
[0027] In this embodiment, sealing pressure rings are provided on the bottom surfaces of the second ring seat 2 and the pressure cover member 3, the second ring seat 2 and the top surfaces of the first ring seat 1 are fitted together, the pressure cover member 3 and the top surfaces of the second ring seat 2 are fitted together, and the top end of the shaft sleeve 4 is provided with an edge for blocking the locking ring sleeve 5, the locking ring sleeve 5 is rotatably sleeved on the surface of the shaft sleeve 4 and slidably abuts against the top surface of the pressure cover member 3, and the bottom end of the shaft sleeve 4 is rotatably sleeved with a flange plate fitted with the bottom surface of the first ring seat 1.
[0028] Specifically, the first ring seat 1 , the second ring seat 2 and the gland member 3 are pressed and bonded together by utilizing the top edge and the bottom flange of the shaft sleeve 4 .
[0029] In this embodiment, the anode ring 6 is embedded and installed on the inner side of the gland member 3 and is in contact with the top surface of the second ring seat 2. The anode ring 6 is a zinc ring or a tin ring.
[0030] Specifically, an anode ring 6 is installed on the surface of the mechanical seal to form a galvanic cell protection, which is no longer limited by the corrosion resistance of the material, and a more common and cheaper metal material can be selected as the seal substrate.
[0031] In this embodiment, sealing slip rings are provided on the surfaces of the second slip ring 14 and the movable ring 15 , and the sealing slip ring on the surface of the second slip ring 14 is interference fit with the inner side of the first ring seat 1 , and the sealing slip ring on the surface of the movable ring 15 is sliding fit with the inner side of the first slip ring 13 .
[0032] Specifically, a plurality of sealing ring structures are used to improve the sealing effect between the surface of the shaft sleeve 4 and the inner side of the first ring seat 1 to prevent leakage of the electrolyte solution.
[0033] In this embodiment, the locking ring sleeve 5 is a hoop structure with an opening, and the end of the hoop is provided with a connecting ear and connected by tightening action of a screw rod.
[0034] Specifically, the first ring seat 1, the second ring seat 2 and the gland member 3 are compressed by locking the locking ring sleeve 5 on the surface of the shaft sleeve 4, and the gland member 3 can be quickly disassembled by disassembling the locking ring sleeve 5 to replace and maintain the anode ring 6.
[0035] The working principle and use process of this utility model:
[0036] In the operation of the external mechanical seal, the shaft sleeve 4 is interference-fitted on the shaft surface, the bottom surface of the first ring seat 1 is fixed to the surface of the medium container, and the pressure between the locking ring sleeve 5 and the flange plate at the bottom end of the shaft sleeve 4 is used to realize the combined compression between the gland member 3, the second ring seat 2 and the first ring seat 1. When the shaft sleeve 4 rotates, the first ring seat 1, the second ring seat 2 and the gland member 3 remain stationary, and the shaft sleeve 4 rotates synchronously with the moving ring 15. Whether the second slip ring 14, the first slip ring 13 and the locking ring sleeve 5 can rotate or remain stationary depends on the friction between them and the shaft sleeve 4. 5 and the sealing ring on the surface of the second slip ring 14 are used to seal the pressure-containing cavity 12, and the abutting sliding between the first slip ring 13, the second slip ring 14 and the dynamic ring 15 is used as the rotation support structure of the shaft sleeve 4. The mechanical seal uses the principle of sacrificial anode, and an anode ring 6 is set on the surface of the mechanical seal to form a primary battery protection. In the electrochemical process, the anode ring 6 as the anode material and the cathode material formed by the seal substrate will conduct current through the ions in the electrolyte solution, thereby forming a closed circuit, and the seal substrate is protected from corrosion as a whole.
[0037] Although the embodiments of the present invention have been shown and described, those skilled in the art will appreciate that various changes, modifications, substitutions and variations may be made to the embodiments without departing from the principles and purpose of the present invention, and that the scope of the present invention is defined by the claims and their equivalents.
Claims
1. An external mechanical seal structure, characterized in that: include: A first ring seat (1), a second ring seat (2), a pressure cover (3) and a shaft sleeve (4); a pressure chamber (12) is provided inside the first ring seat (1) and the second ring seat (2); a first slip ring (13) and a second slip ring (14) are slidably mounted inside the pressure chamber (12) and are rotatably sleeved on the surface of the shaft sleeve (4); the inner side of the first slip ring (13) is slidably sleeved and fixed to a moving ring (15) on the surface of the shaft sleeve (4); the moving ring (15) ) is provided with a sliding ring (16) which is in sliding contact with the surface of the second sliding ring (14), the surfaces of the first ring seat (1) and the second ring seat (2) are both provided with a liquid inlet (11), and the pressure-containing cavity (12) is filled with an electrolyte solution, an anode ring (6) is provided on the inner side of the gland member (3), a locking ring sleeve (5) is rotatably sleeved on the surface of the shaft sleeve (4), and the bottom surface of the locking ring sleeve (5) is slidably fitted with the top surface of the gland member (3).
2. The external mechanical seal structure according to claim 1, characterized in that: The hydraulic pressure of the electrolyte solution inside the first ring seat (1) acts on the top surface of the second slip ring (14) relative to the bottom surface of the second ring seat (2); the hydraulic pressure of the electrolyte solution inside the second ring seat (2) acts on the top surface of the first slip ring (13) relative to the top surface of the first ring seat (1); and the movable ring (15) is slidably sleeved on the inner side of the first slip ring (13).
3. The external mechanical seal structure according to claim 1, characterized in that: The moving ring (15) is a polytetrachloroethylene sliding ring structure and is fixed on the surface of the shaft sleeve (4).
4. The external mechanical seal structure according to claim 1, characterized in that: The bottom surfaces of the second ring seat (2) and the pressure cover (3) are both provided with sealing pressure rings, the second ring seat (2) and the top surfaces of the first ring seat (1) are in contact with each other, the pressure cover (3) and the top surfaces of the second ring seat (2) are in contact with each other, the top end of the shaft sleeve (4) is provided with an edge for blocking the locking ring sleeve (5), the locking ring sleeve (5) is rotatably sleeved on the surface of the shaft sleeve (4) and slidably abuts against the top surface of the pressure cover (3), and the bottom end of the shaft sleeve (4) is rotatably sleeved with a flange plate that is in contact with the bottom surface of the first ring seat (1).
5. The external mechanical seal structure according to claim 1, characterized in that: The anode ring (6) is embedded and installed on the inner side of the gland member (3) and is in contact with the top surface of the second ring seat (2). The anode ring (6) is a zinc ring or a tin ring.
6. The external mechanical seal structure according to claim 1, characterized in that: The surfaces of the second slip ring (14) and the movable ring (15) are both provided with sealing slip rings, and the sealing slip ring on the surface of the second slip ring (14) is interference fit with the inner side of the first ring seat (1), and the sealing slip ring on the surface of the movable ring (15) is sliding fit with the inner side of the first slip ring (13).
7. The external mechanical seal structure according to claim 1, characterized in that: The locking ring sleeve (5) is a hoop structure with an opening, and the end of the hoop is provided with a connecting ear and connected by tightening of a screw rod.