Quick connector
By adopting deformable plastic material and segmented thread structure in the quick joint, the problems of lower sealing and rust in the prior art are solved, and the stable connection between the shell and the equipment body is achieved and the long-life use is long.
Patent Information
- Application Number
- CN202421947448.X
- Authority / Receiving Office
- CN · China
- Patent Type
- Utility models(China)
- Current Assignee / Owner
- Filing Date
- 2024-08-12
- Publication Date
- 2025-04-25
- Estimated Expiration
- 2034-08-12
AI Technical Summary
The sealing performance of existing fast joints is degraded after long-term use, and metal accessories are prone to rust, resulting in unstable connections.
The shell is made of deformable plastic material, and the external threaded joint is divided into a lower thread section and an upper thread section. Through transition and interference with the internal threads of the equipment main body, a guide and sealing structure is formed to avoid the use of raw material tape.
It achieves good sealing between the shell and the equipment body, avoids rust problems, extends service life, is simple to install and does not require raw material tape.
Smart Images
Figure CN222798363U_ABST
Abstract
Description
Technical Field
[0001] The utility model belongs to the technical field of pipe body connection accessories and relates to a quick connector. Background Art
[0002] Cooling equipment, pneumatic equipment, transducer equipment or other equipment that needs to connect a pipe body usually uses a quick connector to connect the air pipe or water pipe, such as a nozzle for mold cooling, equipment cooling, and an air pipe connector for pneumatic equipment. Its structure includes a shell that is screwed to the main body of the equipment, and a pipe body quick connector assembly for connecting the air pipe or water pipe is provided in the shell. When in use, the shell is connected to the main body of the equipment, and then the air pipe or water pipe can be quickly connected or removed. The existing shells are all metal parts. In order to ensure the sealing between the shell and the main body of the equipment, it is necessary to wrap the raw tape on the external thread of the shell when screwing, and seal it with the main body of the equipment through the raw tape. However, the use of raw tape is not only cumbersome, but also the sealing performance cannot be guaranteed. Especially after long-term use, due to the aging or oil pollution of the raw tape, the sealing of the raw tape will fail, and the interface of the metal accessories will rust after long-term use. When replacing the leak, it is easy to twist off the screw mouth, and it is necessary to drill and tap again. Utility Model Content
[0003] The utility model aims at the deficiencies of the prior art and provides a quick connector which has the advantages of simple structure, convenient installation, good sealing performance and long service life.
[0004] In order to solve the above technical problems, the purpose of the utility model is achieved through the following technical solutions:
[0005] A quick connector comprises a shell, wherein the lower end of the shell is provided with an external threaded connector threadedly connected to a device body, and the upper end is connected to a pipe body quick-connect assembly, the shell and the external threaded connector are integrally formed plastic parts, the external thread on the external threaded connector consists of a continuously arranged lower thread segment and an upper thread segment, the lower thread segment and the upper thread segment have the same pitch, the major diameter of the lower thread segment is smaller than the major diameter of the upper thread segment, the external thread of the lower thread segment is transitionally matched with the internal thread of the device body, and the external thread of the upper thread segment is interference fit with the internal thread of the device body to form a sealing structure.
[0006] In the above-mentioned quick connector, the minor diameter of the lower threaded section is smaller than the minor diameter of the upper threaded section.
[0007] In the above-mentioned quick connector, the thread thickness of the lower thread section is smaller than the thread thickness of the upper thread section.
[0008] In the above-mentioned quick connector, the major diameter, minor diameter and thread thickness of the upper thread section gradually increase from bottom to top.
[0009] In the above-mentioned quick connector, preferably, the difference between the major diameter of the upper thread section and the minor diameter of the lower thread section is a first difference, the difference between the major diameter of the lower thread section and the minor diameter of the lower thread section is a second difference, and the ratio of the first difference to the second difference is 1.1:1-1.5:1.
[0010] In the above-mentioned quick connector, preferably, the ratio of the upper thread segment thickness to the lower thread segment thickness is 1.05:1-1.2:1.
[0011] In the above-mentioned quick connector, preferably, the lower thread section and the upper thread section have the same axial distance.
[0012] In the present utility model, the major diameter refers to the diameter of an imaginary cylinder coinciding with the external thread top or the internal thread bottom; the minor diameter refers to the diameter of an imaginary cylinder coinciding with the external thread bottom or the internal thread top; the median radial refers to the diameter of an imaginary cylinder with equal widths of the protrusion and groove on the tooth profile through which the generatrix passes; the pitch refers to the axial distance between adjacent teeth; the tooth thickness refers to the axial distance on both sides of the tooth on the median diameter line.
[0013] In the above-mentioned quick connector, an installation cavity is provided at the upper end of the shell, and a sealing ring, a claw and a tightening sleeve are sequentially assembled in the installation cavity. The tightening sleeve is embedded in the shell and axially fixes the sealing ring and the claw. A cover cap is slidably provided in the tightening sleeve, and a conical driving surface for driving the claw to retract is provided at the lower end of the cover cap.
[0014] Compared with the prior art, the utility model has the following beneficial effects:
[0015] The utility model provides a quick connector, the shell of which is made of deformable plastic material, the external thread on the external thread connector is divided into a two-section structure, and a guide structure is formed by a lower thread section that transitions with the internal thread of the equipment body, so that the external thread connector can be smoothly installed, and a sealing structure is formed by an upper thread section that interference fits with the internal thread of the equipment body, so as to ensure the sealing of the external thread connector and the equipment body, and the utility model will not rust during long-term use, and the screw thread of the equipment body will not be twisted off even if the connector is replaced. The utility model improves the sealing performance by improving the structure of the shell, and does not need to use raw tape during use, so the disadvantages of using raw tape can be avoided. Therefore, the utility model has the advantages of simple structure, easy installation, good sealing and long service life. BRIEF DESCRIPTION OF THE DRAWINGS
[0016] Figure 1 It is a three-dimensional diagram of the utility model;
[0017] Figure 2 It is an axial cross-sectional view of the utility model;
[0018] Figure numerals: 1, housing; 2, external threaded joint; 3, lower threaded section; 4, upper threaded section; 5, sealing ring; 6, claw; 7, tightening sleeve; 8, cover cap; 9, conical driving surface. DETAILED DESCRIPTION
[0019] The present invention will be further described below with reference to the accompanying drawings. Figure 1-2 :
[0020] A quick connector, comprising a housing 1, wherein the lower end of the housing 1 is provided with an external thread connector 2 threadedly connected to a device body, and the upper end is connected with a pipe body quick connector assembly, wherein the housing 1 and the external thread connector 2 are integrally formed plastic parts, and the external thread on the external thread connector 2 is composed of a continuously arranged lower thread segment 3 and an upper thread segment 4, and the pitch p of the lower thread segment 3 is a and the pitch p of the upper thread segment 4 b Similarly, the major diameter d of the lower thread segment 3 is a Smaller than the major diameter d of the upper thread segment 4 b The external thread of the lower thread section 3 is transitionally matched with the internal thread of the equipment body, and the external thread of the upper thread section 4 is interference matched with the internal thread of the equipment body to form a sealing structure.
[0021] When the present embodiment is used, the external thread connector 2 of the housing 1 is aligned with the internal thread of the device body and screwed in. Since the external thread of the lower thread segment 3 and the internal thread of the device body are transitionally matched, the lower thread segment 3 can be easily screwed into the internal thread hole of the device body, and then the upper thread segment 4 is screwed in. Due to the guiding effect of the lower thread segment 3, even if the upper thread segment 4 has a larger major diameter d b , but can still smoothly enter the internal threaded hole. Since the external thread of the upper threaded section 4 is in interference fit with the internal thread of the equipment body, the external thread of the upper threaded section 4 is squeezed and deformed, and forms a sealing structure with the internal threaded hole of the equipment body.
[0022] In order to control the groove depth of the upper thread segment 4 to enhance the strength of the thread, the minor diameter d of the lower thread segment 3 is 1a Smaller than the minor diameter d of the upper thread segment 4 1b .
[0023] In order to obtain better sealing performance, the thread thickness h of the lower thread section 3 is a Smaller than the tooth thickness h of the upper thread segment 4 b .
[0024] In order to make the upper thread segment 4 enter the internal thread hole of the equipment body more smoothly, the major diameter d of the upper thread segment 4 is b , small diameter d 1b and tooth thickness h b They gradually increase from bottom to top.
[0025] Preferably, the major diameter d of the upper thread segment 4 is b and the minor diameter d of the lower thread segment 3 1a The difference is the first difference, the major diameter d of the lower thread segment 3 a and the minor diameter d of the lower thread segment 3 1a The difference between the first difference and the second difference is 1.1:1-1.5:1.
[0026] Preferably, the upper thread segment 4 has a thread thickness h b Thickness h of lower thread segment 3 a The ratio is 1.05:1-1.2:1.
[0027] Preferably, the lower thread segment 3 and the upper thread segment 4 have the same axial distance.
[0028] The specific structure of the tube body quick-connect assembly of this embodiment is that an installation cavity is provided at the upper end of the shell 1, and a sealing ring 5, a claw 6 and a tightening sleeve 7 are sequentially assembled in the installation cavity. The tightening sleeve 7 is embedded in the shell 1 and axially fixes the sealing ring 5 and the claw 6. A cap 8 is slidably arranged in the tightening sleeve 7, and a conical driving surface 9 for driving the claw 6 to retract is provided at the lower end of the cap 8. When the cap 8 moves downward, the conical driving surface 9 drives the claw 6 to retract, and the claw 6 cannot lock the tube body. When the cap 8 is released, the claw 6 resumes its deformation, squeezes the cap 8 to reset, and at the same time clamps the tube body to form a locked state.
[0029] The above embodiments are only preferred embodiments of the present invention and are not intended to limit the protection scope of the present invention. Therefore, any equivalent changes made based on the structure, shape, and principle of the present invention should be included in the protection scope of the present invention.
Claims
1. A quick connector, comprising a housing (1), wherein the lower end of the housing (1) is provided with an external threaded connector (2) threadedly connected to a device body, and the upper end is connected with a pipe body quick connector assembly, characterized in that: The housing (1) and the external threaded joint (2) are integrally formed plastic parts; the external thread on the external threaded joint (2) is composed of a lower threaded section (3) and an upper threaded section (4) which are arranged continuously; the lower threaded section (3) and the upper threaded section (4) have the same thread pitch; the major diameter of the lower threaded section (3) is smaller than the major diameter of the upper threaded section (4); the external thread of the lower threaded section (3) is transitionally matched with the internal thread of the device body; the external thread of the upper threaded section (4) is interference matched with the internal thread of the device body to form a sealing structure.
2. A quick connector according to claim 1, characterized in that: The minor diameter of the lower thread section (3) is smaller than the minor diameter of the upper thread section (4).
3. A quick connector according to claim 1, characterized in that: The thread thickness of the lower thread section (3) is smaller than the thread thickness of the upper thread section (4).
4. A quick connector according to claim 1, characterized in that: The major diameter, minor diameter and thread thickness of the upper thread section (4) gradually increase from bottom to top.
5. A quick connector according to claim 1, characterized in that: The difference between the major diameter of the upper thread segment (4) and the minor diameter of the lower thread segment (3) is a first difference, and the difference between the major diameter of the lower thread segment (3) and the minor diameter of the lower thread segment (3) is a second difference. The ratio of the first difference to the second difference is 1.1:1-1.5:
1.
6. A quick connector according to claim 1, characterized in that: The ratio of the tooth thickness of the upper thread section (4) to the tooth thickness of the lower thread section (3) is 1.05:1-1.2:
1.
7. A quick connector according to claim 1, characterized in that: The upper end of the shell (1) is provided with an installation cavity, in which a sealing ring (5), a clamping claw (6) and a tightening sleeve (7) are sequentially installed. The tightening sleeve (7) is embedded in the shell (1) and axially fixes the sealing ring (5) and the clamping claw (6). A cover cap (8) is slidably arranged in the tightening sleeve (7), and a conical driving surface (9) for driving the clamping claw (6) to retract is arranged at the lower end of the cover cap (8).