Auxiliary tool for mounting mechanical seal of water pump

Abstract

The utility model discloses an auxiliary tool for installing a mechanical seal of a water pump. The auxiliary tool comprises a stepped reducing bolt assembly, a detachable limiting lantern ring, a combined limiting gasket and an improved gland. Axial positioning is achieved through a step structure of the bolt assembly, the limiting lantern ring and a step face form a clamping groove to restrain the installation stroke, anti-rotation clamping teeth of the combined gasket are matched with a gland guide groove to prevent deflection, and a gland depth scale provides accurate compression amount control. According to the scheme, the problem that a sealing piece is damaged due to uneven stress caused by misoperation in traditional installation is solved.

Description

Technical Field

[0001] This utility model relates to the field of water pump mechanical seal installation technology, and more specifically, to an auxiliary tool for water pump mechanical seal installation. Background Technology

[0002] The most common sealing methods for water pumps are packing seals and mechanical seals. Packing seals achieve a seal by compressing the packing material with a gland to form a sealing surface. They have low installation requirements and are easy to implement, but the equipment has a certain leakage rate, the packing needs frequent replacement, and maintenance is extensive. Mechanical seals consist of a fixed part and a rotating part. They achieve a seal on the medium through pressurized contact between a static sealing ring and a dynamic sealing ring. They offer good sealing performance, long service life, and low maintenance, and are commonly used in high-speed, large water pumps, but their installation requires higher technical expertise.

[0003] Mechanical seals are widely used in large water pumps produced by water supply companies. While convenient to use, replacing them requires disassembling the pump, especially the dynamic seal ring (including thrust springs and other accessories), which demands a high level of technical expertise from the installers. The thrust spring of an unused dynamic seal ring is in a freely extended state, while that of an installed one is in a compressed state, creating a positional difference. The original stationary ring gland bolts are often insufficient in length to connect to the pump body. During installation, a pry bar is often used to pry the gland and extend the bolts to the pump body. With this method, even slight uneven stress on the mechanical seal can damage or break it, affecting installation progress and normal equipment operation, resulting in economic losses. Summary of the Invention

[0004] The purpose of this utility model is to provide an auxiliary tool for installing mechanical seals of water pumps, so as to solve the problem of damage to the seal caused by uneven force due to improper operation in traditional installation.

[0005] To achieve the above objectives, the technical solution of this utility model is as follows:

[0006] An auxiliary tool for installing a mechanical seal of a water pump includes a bolt assembly, a limiting collar, a limiting washer, and a gland. The bolt assembly is characterized by: the bolt assembly being coaxially fixed to a first threaded section and a second threaded section, the diameter of the first threaded section being larger than that of the second threaded section, with a stepped surface formed at their connection; the limiting collar being fitted onto the end of the second threaded section and fixed by a threaded connection, the outer diameter of the limiting collar being larger than that of the second threaded section, forming a groove with the stepped surface; the limiting washer including a C-shaped body and anti-rotation teeth, the opening width of the C-shaped body being 3-5mm and the thickness being 2-4mm, the anti-rotation teeth being located on the inner edge of the C-shaped body; the gland having an axially penetrating guide groove, the width of which is clearance-fitted with the tooth width of the anti-rotation teeth; and a depth gauge on the outer end face of the gland, the depth gauge having a scale range of 20-60mm.

[0007] As an improvement of this utility model, the distance between the stepped surface and the limiting collar is 3~5mm, and the surface of the limiting collar is provided with an annular groove, in which a rubber sealing ring is embedded.

[0008] As an improvement of this utility model, the anti-rotation teeth are evenly distributed in 6 to 8 positions along the circumference of the C-shaped body, with a tooth height of 1 to 2 mm and a tooth tip angle of 60 to 90°.

[0009] As an improvement of this utility model, the depth of the guide groove is 1 / 2 of the thickness of the cover, and the inner wall of the guide groove is provided with a wear-resistant coating with a coating thickness of 0.1~0.3mm.

[0010] As an improvement of this utility model, the scale lines of the depth scale are formed by laser etching, and the width of the scale lines is 0.05~0.1mm.

[0011] As an improvement of this utility model, the length of the second threaded section is L = L0 + ΔL, where L0 is the original bolt length and ΔL is a spring compression compensation value of 5~10mm.

[0012] The auxiliary tool for installing mechanical seals of water pumps of this invention has the following beneficial effects:

[0013] (1) This application uses a mechanical hard limiting structure formed by the stepped surface of the stepped bolt and the limiting collar, and uses a laser-scaled depth scale for installation, replacing the traditional installation method that relies on the experience of the installer. The groove formed by the stepped surface and the limiting collar reduces the spring compression error from the traditional ±3mm to ±0.5mm, improves the pressure uniformity of the sealing surface by 40%, and reduces the leakage rate to <3%.

[0014] (2) This application replaces the traditional pry bar operation. The anti-rotation tooth and the guide groove have a 60° tooth tip angle design, which reduces stress concentration by 40%. At the same time, the inner wall of the guide groove is provided with a wear-resistant coating, and the rubber sealing ring provides elastic buffer in the groove of the limiting collar to avoid hard metal contact, reduce metal impact damage, and extend service life.

[0015] (3) This application is equipped with a limit washer, which allows for quick assembly and disassembly without removing the bolts. At the same time, it avoids one-time overload through three incremental tightening, shortening the installation time to 10 minutes. It can be operated by a single person and completely replaces the pry bar operation. In addition, it is equipped with a locking groove, which can prevent the gland from being over-compressed even if it is accidentally over-tightened by 1 to 2 turns. Attached Figure Description

[0016] Figure 1 This is a schematic diagram of the structure of this utility model;

[0017] Figure 2 This is a schematic diagram of the structure of the limiting gasket;

[0018] Figure 3 This is a schematic diagram of the gland structure.

[0019] List of identifiers in attached diagrams:

[0020] 2. Limiting collar; 3. Limiting gasket; 4. Pressure cap; 11. First threaded section; 12. Second threaded section; 13. Stepped surface; 21. Slot; 22. Rubber sealing ring; 31. C-shaped body; 32. Anti-rotation locking teeth; 41. Guide groove; 42. Depth gauge. Detailed Implementation

[0021] The present invention will be further explained below with reference to the accompanying drawings and specific embodiments. It should be understood that the following specific embodiments are only for illustrating the present invention and are not intended to limit the scope of the present invention. It should be noted that the terms "front", "rear", "left", "right", "up" and "down" used in the following description refer to the directions in the accompanying drawings, and the terms "inner" and "outer" refer to the directions toward or away from the geometric center of a specific component, respectively.

[0022] Furthermore, the terms "installation," "connection," and "linking" should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral connection; they can refer to a mechanical connection or an electrical connection; they can refer to a direct connection or an indirect connection through an intermediate medium; and they can refer to the internal connection between two components. Those skilled in the art can understand the specific meaning of the above terms in this utility model based on the specific circumstances.

[0023] As shown in the figure, this utility model provides an auxiliary tool for installing a mechanical seal of a water pump, including a bolt assembly, a limiting collar 2, a limiting washer 3, and a gland 4. The bolt assembly is characterized by being coaxially fixedly connected by a first threaded section 11 and a second threaded section 12. The diameter of the first threaded section 11 is larger than that of the second threaded section 12, and a stepped surface 13 is formed at their connection. The limiting collar 2 is fitted onto the end of the second threaded section 12 and fixed by a threaded connection. The outer diameter of the limiting collar 2 is larger than that of the second threaded section 12. The diameter is 2, forming a groove 21 between it and the step surface 13. The limiting gasket 3 includes a C-shaped body 31 and an anti-rotation tooth 32. The opening width of the C-shaped body 31 is 3-5mm and the thickness is 2-4mm. The anti-rotation tooth 32 is located on the inner edge of the C-shaped body 31. The pressure cover 4 is provided with an axially penetrating guide groove 41. The width of the guide groove 41 is matched with the tooth width of the anti-rotation tooth 32. The outer end face of the pressure cover 4 is provided with a depth scale 42. The depth scale 42 has a scale range of 20-60mm.

[0024] The distance between the stepped surface 13 and the limiting collar 2 in this utility model is 3~5mm. The surface of the limiting collar 2 is provided with an annular groove, and a rubber sealing ring 22 is embedded in the annular groove.

[0025] The anti-rotation teeth 32 of this utility model are evenly distributed in 6 to 8 pieces along the circumference of the C-shaped body 31, with a tooth height of 1 to 2 mm and a tooth tip angle of 60 to 90°.

[0026] The depth of the guide groove 41 described in this utility model is 1 / 2 of the thickness of the pressure cap 4, and the inner wall of the guide groove 41 is provided with a wear-resistant coating with a coating thickness of 0.1~0.3mm.

[0027] The depth scale 42 described in this utility model has graduations formed by laser etching, and the graduation line width is 0.05~0.1mm.

[0028] The length L of the second threaded section 12 described in this utility model is L = L0 + ΔL, where L0 is the original bolt length and ΔL is a spring compression compensation value of 5~10mm.

[0029] The working process of the auxiliary tool for installing mechanical seals of water pumps provided by this utility model is as follows:

[0030] Taking the Andritz 200KW water pump as an example:

[0031] Disassemble the original bolts and screw the first threaded section 11 of the bolt assembly into the pump body until the stepped surface 13 contacts the pump body end face; align the guide groove 41 of the gland 4 with the anti-rotation retaining teeth 32 and insert it so that the "40mm" scale line of the depth gauge 42 is aligned with the pump body end face; tighten the limiting collar 2 to the end of the second threaded section 12 to form a 3mm retaining groove 21; insert the combined gasket so that the retaining teeth are fully inserted into the guide groove 41; use a torque wrench to tighten the bolts in three stages, increasing the torque by 10 N·m each time, until the gland 4 is completely fitted to the pump body.

[0032] The working principle of the auxiliary tool for installing mechanical seals of water pumps provided by this utility model is as follows:

[0033] (1) Axial positioning mechanism: When the gland 4 is compressed to the point where the groove 21 contacts the limiting collar 2, the system reaches the maximum allowable compression (e.g., 3mm), at which point the bolt cannot be screwed in any further.

[0034] (2) Anti-deflection mechanism: The 60° tooth side angle of the anti-deflection tooth 32 contacts the side wall of the guide groove 41, generating a radial component force. This component force keeps the pressure cover 4 in a self-centering state, and the deflection angle is controlled within ±0.5°.

[0035] (3) Elastic compensation mechanism: When the system is overloaded, the sealing ring is compressed by 0.2mm, absorbing 5%~8% of the impact energy. After unloading, the rubber recovers its deformation and pushes the limiting collar 2 (2) back to its original position, eliminating the thread gap.

[0036] (4) Visual aid principle: Before installation, align the depth scale 42 "0" with the pump body end face. After installation, read the scale value corresponding to the end face of the pressure cap (e.g., "40mm"). This value is linearly related to the spring compression.

[0037] The accompanying drawings merely illustrate the technical concept of this utility model and should not be construed as limiting the scope of protection of this utility model. For those skilled in the art, various improvements and modifications can be made without departing from the principle of this utility model, and all such improvements and modifications fall within the scope of protection of the claims of this utility model.

Claims

1. A tool for assisting in the installation of a mechanical seal for a water pump, comprising a bolt assembly, a spacer collar, a spacer washer, a gland, characterised in that: The bolt assembly is composed of a first threaded section and a second threaded section coaxially fixed together. The diameter of the first threaded section is larger than that of the second threaded section, and a stepped surface is formed at the connection between the two. The limiting collar is sleeved on the end of the second threaded section and fixed by a threaded connection. The outer diameter of the limiting collar is larger than that of the second threaded section, and a groove is formed between the limiting collar and the stepped surface. The limiting washer includes a C-shaped body and anti-rotation teeth. The opening width of the C-shaped body is 3-5mm and the thickness is 2-4mm. The anti-rotation teeth are located on the inner edge of the C-shaped body. The pressure cap has an axially penetrating guide groove. The width of the guide groove is matched with the tooth width clearance of the anti-rotation teeth. The outer end face of the pressure cap has a depth scale with a scale range of 20-60mm.

2. The water pump mechanical seal installation aid tool of claim 1, wherein: The distance between the stepped surface and the limiting collar is 3~5mm, and the surface of the limiting collar is provided with an annular groove, in which a rubber sealing ring is embedded.

3. The water pump mechanical seal installation aid tool of claim 1, wherein: The anti-rotation teeth are evenly distributed in 6 to 8 positions along the circumference of the C-shaped body, with a tooth height of 1 to 2 mm and a tooth tip angle of 60 to 90°.

4. The water pump mechanical seal installation aid tool of claim 1, wherein: The depth of the guide groove is half the thickness of the cap, and the inner wall of the guide groove is provided with a wear-resistant coating with a coating thickness of 0.1~0.3mm.

5. The water pump mechanical seal installation aid tool of claim 1, wherein: The depth scale is formed by laser etching, and the width of the scale line is 0.05~0.1mm.

6. The tool for assisting in the installation of a mechanical seal for a water pump of any one of claims 1 to 5, wherein: The length of the second threaded section is L = L0 + ΔL, where L0 is the original bolt length and ΔL is the spring compression compensation value of 5~10mm.

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