Gas detection polyurethane fixing structure

Abstract

The utility model provides a gas detection polyurethane fixing structure, which relates to the field of gas detection, and comprises a water feeding detection base, a gas detection base and a gas detection base, the water feeding detection suite is detachably connected to the opening in the upper end of the water feeding detection base; the polyurethane sealing sleeve is mounted in the water feeding detection kit; and the thread structure is arranged at the lower end of the inner wall of the water feeding detection kit. The thread structure and the polyurethane sealing sleeve are in extrusion fit, elastic deformation and mechanical interlocking are combined, traditional single radial friction force fixing is replaced, the stability of the detection assembly under vibration and external force is enhanced, loosening displacement is reduced, meanwhile, abrasion of the polyurethane sleeve is reduced, the service life is prolonged, and the maintenance cost is reduced.

Description

Technical Field

[0001] This utility model relates to the field of gas detection, and in particular to a gas detection polyurethane fixing structure. Background Technology

[0002] In the field of gas detection, polyurethane fixing structures are widely used. Traditional polyurethane fixing structures for gas detection generally use a polyurethane sleeve directly fitted onto the outside of the detection component, relying mainly on the radial friction force generated by the elastic deformation of the polyurethane to achieve fixation. For example, in the scenario of liquid detection on a pump head, the polyurethane sleeve clamps the threaded connection of the detection component through its own tightness, relying solely on this single fixing method of friction generated by the sleeve to maintain positioning.

[0003] However, this fixing method has inherent drawbacks. Because it relies entirely on the tightness of the polyurethane sleeve and radial friction, its fixing stability is poor. Under conditions such as vibration or external interference, the detection components are prone to loosening and displacement, affecting detection accuracy. Furthermore, this method, which relies solely on the elasticity of the material for clamping, causes the polyurethane sleeve to wear out faster due to continuous stress and repeated deformation, increasing maintenance costs and reducing equipment operating efficiency.

[0004] Therefore, we propose a polyurethane fixing structure for gas detection. Utility Model Content

[0005] This invention addresses the shortcomings of existing technologies by using a threaded structure to form a compression fit with a polyurethane sealing sleeve, combining elastic deformation and mechanical interlocking. This replaces the traditional single radial friction fixation, enhancing the stability of the detection component under vibration and external forces, reducing loosening and displacement, while also reducing wear on the polyurethane sleeve, extending its lifespan, and reducing maintenance costs.

[0006] In order to solve the above-mentioned technical problems, the present invention solves the problems of instability and easy damage of traditional gas detection polyurethane fixing methods through the following technical solution.

[0007] To achieve the above objectives, the present invention adopts the following technical solution:

[0008] A gas detection polyurethane fixing structure, comprising:

[0009] The water level testing base has a mounting connector on its side;

[0010] A water supply testing kit is detachably connected to the upper opening of the water supply testing base;

[0011] A polyurethane sealing sleeve is installed inside the water detection kit;

[0012] A threaded structure is provided on the lower end of the inner wall of the water detection kit;

[0013] The polyurethane sealing sleeve is inserted into the bottom opening of the water supply detection kit, with its top abutting against the top surface of the inner wall of the water supply detection kit, and its lower end forming a compression fit with the threaded structure, which is used to fix the external threaded detection component and ensure sealing.

[0014] Preferably, the thread structure is an annular internal thread, and its tightening direction is perpendicular to the insertion direction of the polyurethane sealing sleeve.

[0015] Preferably, the axial cross-section of the polyurethane sealing sleeve is stepped, and its lower outer diameter is larger than the inner diameter of the threaded structure, so as to achieve compression fixation through interference fit.

[0016] Preferably, the water supply detection kit and the water supply detection base are detachably connected via a threaded or snap-fit ​​structure.

[0017] Preferably, the top opening of the water supply detection kit is provided with a guide cone surface for guiding the external thread detection component to be screwed in.

[0018] Preferably, the mounting connector is a detachable fluid connection connector, including at least one of a quick-connect connector, a threaded connector, or a flange connector.

[0019] Preferably, the Shore hardness of the polyurethane sealing sleeve is 70A-90A.

[0020] Compared with the prior art, the present invention has the following beneficial effects:

[0021] The gas detection polyurethane fixing structure provided in this application forms a compression fit between the threaded structure and the polyurethane sealing sleeve, combined with elastic deformation and mechanical interlocking, replacing the traditional single radial friction fixing. This enhances the stability of the detection component under vibration and external force, reduces loosening and displacement, and at the same time reduces wear on the polyurethane sleeve, extends its service life, and reduces maintenance costs. Attached Figure Description

[0022] To more clearly illustrate the technical solutions in the embodiments of this utility model, the drawings used in the embodiments will be briefly introduced below. Obviously, the drawings described below are only some embodiments of this utility model. For those skilled in the art, other drawings can be obtained based on these drawings without creative effort.

[0023] Figure 1 This is a schematic diagram of the overall structure of this utility model;

[0024] Figure 2 This is a schematic diagram of the disassembled structure of this utility model;

[0025] Figure 3 This is a schematic diagram showing the disassembled structure of the water supply detection base and water supply detection kit of this utility model.

[0026] Figure 4 This is a cross-sectional view of the polyurethane sealing sleeve of this utility model in the inserted state.

[0027] Figure 5 This is a schematic cross-sectional view of the water supply detection kit of this utility model;

[0028] Figure 6 This is a schematic cross-sectional view of the polyurethane sealing sleeve of this utility model.

[0029] Drawing number descriptions: 1. Water supply test base; 2. Water supply test kit; 21. Guide cone surface; 3. Polyurethane sealing sleeve; 4. Threaded structure; 5. Mounting connector. Detailed Implementation

[0030] The present invention will now be described in further detail with reference to the accompanying drawings.

[0031] The following description is intended to disclose the present invention so that those skilled in the art can implement it. The preferred embodiments described below are merely examples, and other obvious modifications will be apparent to those skilled in the art. The basic principles of the present invention defined in the following description can be used in other embodiments, modifications, improvements, equivalents, and other technical solutions that do not depart from the spirit and scope of the present invention.

[0032] Those skilled in the art should understand that in the disclosure of this utility model, the terms "longitudinal", "lateral", "up", "down", "left", "right", "front", "rear", "vertical", "horizontal", "top", "bottom", "inner", "outer", etc., indicate the orientation or position based on the orientation or positional relationship shown in the accompanying drawings. They are only for the purpose of simplifying the description of this utility model and do not indicate or imply that the device or component referred to must have a specific orientation, or be constructed and operated in a specific orientation. Therefore, the above terms should not be construed as limitations on this utility model.

[0033] It is understood that the term "a" should be understood as "at least one" or "one or more", that is, in one embodiment, the number of an element can be one, while in another embodiment, the number of the element can be multiple, and the term "a" should not be understood as a limitation on the number.

[0034] Example:

[0035] Please see Figure 1-6A polyurethane fixing structure for gas detection includes: a water supply detection base 1 with a mounting connector 5 on its side; a water supply detection kit 2 detachably connected to the upper opening of the water supply detection base 1; a polyurethane sealing sleeve 3 installed inside the water supply detection kit 2; and a threaded structure 4 disposed at the lower end of the inner wall of the water supply detection kit 2. The polyurethane sealing sleeve 3 is inserted from the bottom opening of the water supply detection kit 2, its top abutting against the top surface of the inner wall of the water supply detection kit 2, and its lower end forming a compression fit with the threaded structure 4, for fixing the external threaded detection component and ensuring sealing.

[0036] The gas detection polyurethane fixing structure of this application is mainly composed of components such as water supply detection base 1, water supply detection kit 2, polyurethane sealing sleeve 3 and threaded structure 4. The following is a detailed description of the structure and working principle.

[0037] The water supply testing base 1 has an overall cylindrical structure, with an internal thread at the upper opening that matches the external thread of the water supply testing kit 2 (the thread specification is compatible with the external thread of the water supply testing kit 2, not shown in the figure), ensuring connection strength and sealing. A quick-change installation connector 5 is integrally welded to its side. This installation connector 5 is a standard pneumatic quick-change connector (not shown in the figure), which can quickly connect to external air or water systems to enable fluid flow.

[0038] The water supply testing kit 2 is generally stepped cylindrical in shape. It matches the upper internal thread of the water supply testing base 1, enabling a detachable connection. The lower end of the inner wall of the water supply testing kit 2 is machined with an annular internal thread, i.e., thread structure 4. The thread profile of thread structure 4 is triangular, used to form a mechanical interlock with the polyurethane sealing sleeve 3. The top opening of the water supply testing kit 2 has a guide cone surface 21 with a cone angle of 60°. The cone surface is polished to guide the external threaded testing component to screw in coaxially, avoiding uneven loading.

[0039] The polyurethane sealing sleeve 3 is made of polyurethane material with a Shore hardness of 80A and is molded. Its axial cross-section is stepped, specifically divided into upper and lower sections. The outer diameter of the upper section is clearance-fitted with the upper diameter of the inner wall of the water supply detection kit 2 to ensure guidance during installation. The outer diameter of the lower section is larger than the minimum inner diameter of the thread structure 4, thus forming an interference fit. A through hole is provided at the central shaft of the polyurethane sealing sleeve 3, and the diameter of the hole is adapted to the outer diameter of the external thread detection component to ensure the sealing performance when the detection component passes through.

[0040] The thread structure 4 is an annular internal thread machined on the lower end of the inner wall of the water supply test kit 2. Its tightening direction is clockwise and perpendicular to the axial direction of the insertion of the polyurethane sealing sleeve 3, ensuring that the lower end of the polyurethane sealing sleeve 3 can be inserted into the tooth gap to form a mechanical lock after expansion.

[0041] The polyurethane sealing sleeve 3 is inserted axially upward from the bottom opening of the water supply and water supply test kit 2 until its top stepped surface is completely in contact with the top surface of the inner wall of the water supply test kit 2. At this time, the lower section of the polyurethane sealing sleeve 3 is located in the area where the thread structure 4 is located. Because the outer diameter of the lower section is larger than the inner diameter of the thread structure 4, a preliminary interference compression is formed.

[0042] Next, the water supply test kit 2 equipped with the polyurethane sealing sleeve 3 is screwed into the upper opening of the water supply test base 1 through its lower external thread and tightened until there is no gap between the two mating surfaces. At this time, the water supply test base 1 forms an axial limit on the water supply test kit 2, further compressing the polyurethane sealing sleeve 3, increasing the interference between its lower section and the thread structure 4, and ensuring the pre-fixing effect.

[0043] Finally, the threaded connection of the external threaded detection component (such as a gas sensor, not shown in the figure) is screwed in coaxially along the guide cone surface 21 at the top of the water supply detection kit 2. The external thread of the detection component contacts the inner wall of the central through hole of the polyurethane sealing sleeve 3. As the screwing depth increases, the detection component squeezes the polyurethane sealing sleeve 3 to make it expand radially, and the lower end is fully embedded in the tooth gap of the thread structure 4 to form a mechanical interlock. At the same time, the elastic deformation of the polyurethane sealing sleeve 3 fills the gap between the detection component and the water supply detection kit 2 to achieve a seal.

[0044] Working principle

[0045] When the external threaded detection component is screwed in, it compresses the polyurethane sealing sleeve 3, causing its lower end to expand radially and embed into the tooth gap of the thread structure 4 of the water supply detection kit 2, forming a mechanical lock similar to "gear meshing," rather than the traditional single frictional fixation. This structure can prevent the detection component from loosening through the physical engagement of the thread and the sealing sleeve under vibration or external force interference, significantly improving the stability of the fixation.

[0046] The polyurethane sealing sleeve 3 itself has high elasticity. Its central through hole is interference-fitted with the external thread of the detection component. After expansion, it tightly fits the surface of the detection component and the inner wall of the water supply detection kit 2. At the same time, the upper section abuts against the inner top surface of the water supply detection kit 2, and the lower section is squeezed against the thread structure 4 to form a multi-directional seal, ensuring that there is no leakage of fluid gas or liquid during the gas detection process.

[0047] Under vibration conditions, threaded gaps can easily form between the detection component and the water supply detection kit 2, leading to relative displacement. The elastic deformation of the polyurethane sealing sleeve 3 can compensate for this gap in real time. When the detection component tends to loosen due to vibration, the rebound force of the polyurethane sealing sleeve 3 continuously applies radial pressure, which, together with the mechanical locking of the thread structure 4, prevents displacement. At the same time, the stepped structure of the polyurethane sealing sleeve 3 disperses vibration stress, avoiding wear caused by local stress concentration.

[0048] The 60° guide cone 21 on the top of the water testing kit 2 ensures that the external testing components are screwed in coaxially, avoiding excessive local compression and uneven load on the polyurethane sealing sleeve 3 due to installation misalignment, and reducing uneven wear of the sealing sleeve.

[0049] When disassembling the testing component, rotate the testing component in the opposite direction. The polyurethane sealing sleeve 3 will elastically reset and disengage from the tooth gap of the thread structure 4, leaving no residual locking force, which makes it easy to remove the testing component.

[0050] When replacing the polyurethane sealing sleeve 3, simply loosen the connection between the water supply test kit 2 and the water supply test base 1. After separating the two, the old polyurethane sealing sleeve 3 can be pulled out from the bottom opening of the water supply test kit 2. After inserting the new polyurethane sealing sleeve 3, the assembly can be completed. There is no need to clean the debris generated by wear in the traditional structure, which greatly reduces maintenance costs.

[0051] Those skilled in the art should understand that the embodiments of the present invention described above and shown in the accompanying drawings are merely examples and do not limit the present invention. The purpose of the present invention has been fully and effectively achieved. The functions and structural principles of the present invention have been shown and explained in the embodiments. Without departing from the stated principles, the implementation of the present invention may have any variations or modifications.

Claims

1. A gas detection polyurethane fixing structure, characterized in that, include: Water supply test base (1), with a mounting connector (5) on its side; Water supply test kit (2) is detachably connected to the upper opening of the water supply test base (1); A polyurethane sealing sleeve (3) is installed inside the water supply detection kit (2); A threaded structure (4) is provided on the lower end of the inner wall of the water detection kit (2); The polyurethane sealing sleeve (3) is inserted into the bottom opening of the water supply detection kit (2), its top abuts against the top surface of the inner wall of the water supply detection kit (2), and its lower end forms a compression fit with the threaded structure (4) to fix the external threaded detection component and ensure sealing.

2. The gas detection polyurethane fixing structure according to claim 1, characterized in that: The threaded structure (4) is an annular internal thread, and its tightening direction is perpendicular to the insertion direction of the polyurethane sealing sleeve (3).

3. The gas detection polyurethane fixing structure according to claim 1, characterized in that: The axial section of the polyurethane sealing sleeve (3) is stepped, and its lower outer diameter is larger than the inner diameter of the thread structure (4), and compression fixing is achieved through interference fit.

4. The gas detection polyurethane fixing structure according to claim 1, characterized in that: The water supply testing kit (2) and the water supply testing base (1) are detachably connected by a threaded or snap-fit ​​structure.

5. The gas detection polyurethane fixing structure according to claim 1, characterized in that: The top opening of the water testing kit (2) is provided with a guide cone surface (21) for guiding the external thread testing component to be screwed in.

6. The gas detection polyurethane fixing structure according to claim 1, characterized in that: The mounting connector (5) is a detachable fluid connection connector, including at least one of quick-connect connectors, threaded connectors or flange connectors.

7. The gas detection polyurethane fixing structure according to claim 1, characterized in that: The Shore hardness of the polyurethane sealing sleeve (3) is 70A-90A.

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