Special thread
By designing pre-deformed thread teeth and toothed helical cavity structures, the problem of unstable connection between PVC pipe fittings and metal pipe fittings was solved, achieving a stable connection and reusability.
Patent Information
- Application Number
- CN202520005815.2
- Authority / Receiving Office
- CN · China
- Patent Type
- Utility models(China)
- Current Assignee / Owner
- Filing Date
- 2025-01-03
- Publication Date
- 2025-11-04
- Estimated Expiration
- 2035-01-03
AI Technical Summary
In the existing technology, when PVC pipe fittings are threaded together with metal pipe fittings, the mismatch between the threads of the two materials leads to an unstable connection, which can easily cause water leakage and frequent replacement.
A special thread is designed, which adopts pre-deformed thread teeth and toothed helical cavity structure. By utilizing the elastic deformation characteristics of PVC material, the tooth shape of the pre-deformed thread teeth is the same as that of the metal thread after connection, and the connection is maintained firmly through elastic deformation. The helical cavity can be reused.
It achieves a stable connection between PVC pipe fittings and metal pipe fittings, reducing water leakage and maintenance costs, and the special thread can be reused.
Smart Images
Figure CN223511733U_ABST
Abstract
Description
Technical Field
[0001] This utility model relates to the field of thread technology, and in particular to a special thread. Background Technology
[0002] When connecting pipes, metal pipe fittings are often used to connect PVC pipe fittings. Although the thread specifications of the two types of pipe fittings are the same, because the material of PVC pipe fittings is softer, when connecting the two different materials, the thread teeth of the metal thread will re-machine the thread of the PVC pipe fitting according to the tolerance of the metal thread. As a result, when connecting again, the two threads will no longer maintain reasonable tolerance, leading to connection failure, often causing water leakage, frequent replacement of PVC pipe fittings, and high maintenance costs. Utility Model Content
[0003] To address the issue of re-threading and loosening when connecting threads of two different materials, this invention provides a special thread.
[0004] The technical solution provided by this utility model is: a special thread, including pre-deformed thread teeth, the tooth tips of two adjacent pre-deformed thread teeth are flat, and the thread column is provided with a toothed helical cavity inside the pre-deformed thread teeth, the tooth tips of the toothed helical cavity are staggered from the tooth roots of the pre-deformed thread teeth.
[0005] The dimensions of the pre-deformed thread teeth and the toothed helical cavity are such that when the pre-deformed thread teeth are connected to the metal thread, the thread teeth after deformation of the pre-deformed thread teeth are the same as the tooth shape of the metal thread, and the helical cavity after compression keeps the pre-deformed thread teeth in elastic deformation.
[0006] This special thread is suitable for PVC materials.
[0007] The threaded column processed using this special thread has a chamfer.
[0008] The beneficial effects of this utility model are as follows: Utilizing the principle that the elastic deformation of PVC material is greater than that of metal, a pre-deformed thread tooth and a toothed helical cavity are designed. When the pre-deformed thread tooth is connected to the metal thread, the thread tooth after deformation is the same as the tooth shape of the metal thread. The compression preload of the pre-deformed thread tooth can ensure the firmness of the threaded connection. At the same time, the helical cavity after compression keeps the pre-deformed thread tooth in elastic deformation, and it can be reused after the special thread is disassembled. Attached Figure Description
[0009] Appendix Figure 1 This is a schematic diagram of the structure of this utility model;
[0010] Appendix Figure 2 This is a schematic diagram of the structure of this utility model after being connected with a metal thread;
[0011] Appendix Figure 3This is a diagram of the outer tube of this utility model.
[0012] In the figure, 1-pre-deformed thread tooth, 11-deformed thread tooth, 2-tooth-shaped helical cavity, 21-compressed helical cavity, 3-metal thread, 4-chamfer, 5-thread post. Detailed Implementation
[0013] like Figures 1-3 As shown, the following description uses the threaded column 5 as an example: A special thread includes pre-deformed thread teeth 1, the tips of two adjacent pre-deformed thread teeth 1 are flat, and the threaded column 5 has a toothed helical cavity 2 inside the pre-deformed thread teeth 1, the tips of the toothed helical cavity 2 are staggered from the tips of the pre-deformed thread teeth 1.
[0014] The dimensions of the pre-deformed thread tooth 1 and the toothed helical cavity 2 are such that when the pre-deformed thread tooth 1 is connected to the metal thread 3, the thread tooth 11 after deformation of the pre-deformed thread tooth 1 has the same tooth shape as the metal thread 3, and the helical cavity 21 after compression keeps the pre-deformed thread tooth 1 in elastic deformation.
[0015] This special thread is suitable for PVC material. It utilizes the principle that the elastic deformation of PVC material is greater than that of metal. It is designed with pre-deformed thread teeth 1 and toothed helical cavity 2. When the pre-deformed thread teeth 1 are connected to the metal thread 3, the thread teeth 11 after the pre-deformed thread teeth 1 are deformed are the same as the tooth shape of the metal thread 3. The compression preload of the pre-deformed thread teeth 1 can ensure the firmness of the threaded connection. At the same time, after compression, the helical cavity 21 keeps the pre-deformed thread teeth 1 in elastic deformation, and can be reused after the special thread is disassembled.
[0016] The threaded post 5, machined using this special thread, has a chamfer 4.
Claims
1. A special thread, comprising pre-deformed thread teeth (1), characterized in that: The tips of two adjacent pre-deformed thread teeth (1) are flat. The threaded column (5) has a toothed helical cavity (2) inside the pre-deformed thread teeth (1). The tips of the toothed helical cavity (2) are staggered from the tips of the pre-deformed thread teeth (1). The dimensions of the pre-deformed thread tooth (1) and the toothed helical cavity (2) are such that when the pre-deformed thread tooth (1) is connected to the metal thread (3), the thread tooth (11) after deformation of the pre-deformed thread tooth (1) is the same as the tooth shape of the metal thread (3), and the helical cavity (21) after compression keeps the pre-deformed thread tooth (1) in elastic deformation.
2. The special thread according to claim 1, characterized in that: This special thread is suitable for PVC materials.
3. A special thread according to claim 1, characterized in that: The threaded column (5) processed using this special thread has a chamfer (4).