A multi-purpose pressure testing nozzle structure
By designing a multi-purpose pressure testing nozzle structure, the problems of mismatched or lost pressure testing nozzle models during the maintenance of gas pressure regulating cabinets were solved, achieving a sealed connection that adapts to various pipe diameters and improving work efficiency and sealing effect.
Patent Information
- Authority / Receiving Office
- CN · China
- Patent Type
- Utility models(China)
- Current Assignee / Owner
- CHENGDU CITY GAS
- Filing Date
- 2025-06-12
- Publication Date
- 2026-05-26
AI Technical Summary
In the existing technology, the maintenance of gas pressure regulating cabinets requires multiple pressure testing nozzles of different models, which are easy to lose and the models are incompatible. In addition, it is necessary to wrap them with PTFE tape for sealing, resulting in low work efficiency.
Design a multi-purpose pressure testing nozzle structure with a hollow interior and a connecting nozzle and a threaded end at each end. The threaded end has a stepped multi-stage interface with external threads on each stage, suitable for different pipe diameters. It is also equipped with a sealing ring and an elastic ring to achieve a sealed connection for various pipe diameters.
This technology enables a single pressure testing nozzle to be used for multiple pipe diameters, reducing the risk of loss, improving work efficiency, eliminating the need for wrapping PTFE tape, and enhancing operational efficiency and sealing performance.
Smart Images
Figure CN224286212U_ABST
Abstract
Description
Technical Field
[0001] This utility model relates to a pressure measuring nozzle, and more particularly to a multi-purpose pressure measuring nozzle structure. Background Technology
[0002] During routine maintenance and startup of the gas pressure regulating cabinet, staff need to install pressure gauges to test and adjust various pressures. Due to the different pipe diameters, multiple pressure gauges of different models are required, often resulting in lost or incompatible gauges during maintenance. Furthermore, the pressure gauges need to be sealed with Teflon tape, and the tape must be cleaned after each removal, leading to low work efficiency. Summary of the Invention
[0003] Purpose of the invention: In order to overcome the shortcomings of the existing technology, this utility model provides a multi-purpose pressure testing nozzle structure, which enables a single pressure testing nozzle to be adapted to different pipe diameters.
[0004] Technical Solution: To achieve the above objectives, this utility model provides a multi-purpose pressure testing nozzle structure. The pressure testing nozzle is hollow inside, with a connecting nozzle and a threaded end at each end. The connecting nozzle is used to connect to a pressure testing instrument, and the threaded end is used to connect to the pipe opening of the device being tested. The threaded end has at least two levels of interfaces distributed in a stepped manner, and each interface is provided with an external thread structure. The outer diameter of each interface gradually decreases in the direction away from the connecting nozzle. The pressure testing nozzle can be threadedly connected to pipe openings of different diameters through each level of interface.
[0005] Furthermore, in adjacent interfaces, the minor diameter of the external thread on the higher-level interface is larger than the major diameter of the external thread on the lower-level interface.
[0006] Furthermore, the interfaces at each level on the threaded part are arranged concentrically.
[0007] Furthermore, a locking nut is provided between the connecting nozzle and the threaded portion.
[0008] Furthermore, a seal is provided on the end of each interface near the connector.
[0009] Furthermore, the sealing element is an elastic sealing ring, and the outer diameter of the sealing ring is larger than the major diameter of the external thread of the interface.
[0010] Furthermore, each interface has an annular groove at the end near the connector, and the sealing ring is fitted into the annular groove accordingly.
[0011] Furthermore, in adjacent interfaces, the outer diameter of the sealing ring on the lower-level interface is larger than the minor diameter of the external thread on the higher-level interface; when the higher-level interface is connected to the pipe opening of the device under test, the sealing ring on the lower-level interface is deformed under pressure and adheres tightly to the inner wall of the pipe opening of the device under test.
[0012] Furthermore, an elastic ring is embedded at the end of the lowest-level interface away from the connecting nozzle; the outer diameter of the elastic ring is larger than the minor diameter of the external thread on the lowest-level interface, but smaller than the major diameter of the external thread on the lowest-level interface.
[0013] Beneficial effects: The multi-purpose pressure testing nozzle structure of this utility model has multiple interfaces arranged in a stepped shape on the pressure testing nozzle, so that the pressure testing nozzle is suitable for installation on valves of various pipe diameters; the addition of a sealing ring on the pressure testing nozzle eliminates the need for Teflon tape and improves work efficiency. Attached Figure Description
[0014] Appendix Figure 1 This is a schematic diagram of a pressure gauge with a two-stage interface.
[0015] Appendix Figure 2 This is a schematic diagram of a pressure testing nozzle with a three-level interface.
[0016] Appendix Figure 3 A schematic diagram of a pressure gauge equipped with an elastic ring;
[0017] Appendix Figure 4 This is a comparison diagram of the outer diameters of the sealing ring and the elastic ring on the pressure testing nozzle. Detailed Implementation
[0018] The present invention will be further described below with reference to the accompanying drawings.
[0019] As attached Figures 1 to 4 The aforementioned multi-purpose pressure testing nozzle structure is hollow inside, with a connecting nozzle 1 and a threaded end 2 at each end. The connecting nozzle 1 is used to connect to a pressure testing instrument, typically a flexible hose from the instrument. The threaded end 2 is used to connect to the pipe port of the device being tested. Taking a gas pressure regulating cabinet as an example, the threaded end 2 connects to the pipe port at the valve of the gas regulating cabinet, and the pipe port at the valve has an internal thread structure. Because gas regulating cabinets have different pipe diameters, workers need to prepare multiple pressure testing nozzles of different models. During maintenance and repair, situations such as lost or incompatible nozzles frequently occur, making it impossible to carry out the work.
[0020] As attached Figure 1 and 2As shown, the threaded portion 2 has at least two levels of interfaces 3 arranged in a stepped pattern. Each interface 3 is provided with an external thread structure, and the outer diameter of each interface 3 gradually decreases in the direction away from the connecting nozzle 1. This allows the pressure testing nozzle to be threadedly connected to pipes of different diameters through each level of interface 3. Therefore, the pressure testing nozzle of this invention can be used with valves of various pipe diameters. When maintenance personnel perform repairs on gas pressure regulating cabinets, the number of pressure testing nozzles they need to carry can be reduced, and the nozzles are less likely to be lost.
[0021] As attached Figure 3 As shown, the interfaces 3 on the threaded portion 2 are concentrically arranged, and in adjacent interfaces 3, the minor diameter of the external thread on the higher-level interface 3 is larger than the major diameter of the external thread on the lower-level interface 3. When the higher-level interface 3 is screwed into the pipe opening of the device under test, the major diameter of the external thread on the lower-level interface 3 will be correspondingly smaller than the inner diameter of the pipe opening of the device under test. Therefore, the lower-level and even lower-level interfaces 3 can be inserted into the pipe opening without causing interference.
[0022] A locking nut 4 is provided between the connecting nozzle 1 and the threaded part 2, which facilitates the tightening of the pressure testing nozzle.
[0023] Each interface 3 has a sealing element near the connector 1 at one end. Specifically, the sealing element is an elastic sealing ring 5, and the outer diameter of the sealing ring 5 is larger than the major diameter of the external thread of the interface 3. When the interface 3 is tightened onto the pipe opening of the device under test via the threaded structure, the sealing ring 5 on that interface 3 is squeezed tightly at the pipe opening, thus sealing and preventing air leakage. Because of the added sealing ring 5, there is no need to wrap Teflon tape around the pressure testing nozzle, saving both the material cost of Teflon tape and the time required for wrapping and cleaning it, thereby improving work efficiency.
[0024] As attached Figure 4 As shown, each level of interface 3 has an annular groove 6 at one end near the connecting nozzle 1, and the sealing ring 5 is correspondingly stuck in the annular groove 6 to prevent the sealing ring 5 from falling off the pressure testing nozzle.
[0025] As attached Figure 4As shown, in two adjacent interface levels 3, the outer diameter of the sealing ring 5 on the lower-level interface 3 is larger than the minor diameter of the external thread on the higher-level interface 3. Therefore, when the higher-level interface 3 is screwed into the pipe opening of the device under test, the outer diameter of the sealing ring 5 on the lower-level interface 3 will be larger than the inner diameter of the pipe opening. Consequently, the sealing ring 5 on the lower-level interface 3 will be deformed under pressure, causing it to adhere tightly to the inner wall of the pipe opening of the device under test, thus sealing the pipe opening. Therefore, in this invention, when a certain interface level 3 is connected to the pipe opening of the device under test, the sealing ring 5 on that interface level 3 will adhere tightly to the outer opening of the pipe opening, while the sealing ring 5 on the lower-level interface 3 will adhere tightly to the inner wall of the pipe opening. Thus, both the sealing ring 5 on that interface level 3 and the sealing ring 5 on the lower-level interface 3 will seal the pipe opening of the device under test, thereby improving the sealing effect.
[0026] As attached Figure 3 As shown, an elastic ring 7 is provided at the end of the lowest-level interface 3 away from the connecting nozzle 1. The elastic ring 7 is also a type of sealing ring 5. The outer diameter of the elastic ring 7 is larger than the minor diameter of the external thread on the lowest-level interface 3, but smaller than the major diameter of the external thread on the lowest-level interface 3. When the lowest-level interface 3 is connected to the pipe opening of the device under test, the sealing ring 5 on the lowest-level interface 3 is pressed tightly against the outer opening of the pipe opening, while the elastic ring 7 is pressed tightly against the inner wall of the pipe opening, thereby improving the sealing effect.
[0027] When the pressure test nozzle is removed from the nozzle, friction occurs between the inner wall of the nozzle and the sealing ring 5 or the elastic ring 7. For the sealing ring 5, the annular groove 6 and the external thread structure on the interface 3 prevent the sealing ring 5 from falling off. For the elastic ring 7, since there is no external thread structure to prevent it from falling off, the elastic ring 7 needs to be embedded in the lowest level interface 3 to prevent it from falling off the pressure test nozzle.
[0028] The above description is only a preferred embodiment of the present utility model. It should be noted that for those skilled in the art, several improvements and modifications can be made without departing from the principle of the present utility model, and these improvements and modifications should also be considered within the protection scope of the present utility model.
Claims
1. A multi-purpose pressure testing nozzle structure, characterized in that: The pressure testing nozzle is hollow inside, and the two ends of the pressure testing nozzle are a connecting nozzle (1) and a threaded part (2), respectively. The connecting nozzle (1) is used to connect with the pressure testing instrument, and the threaded part (2) is used to connect with the pipe opening of the device being tested. The threaded part (2) has at least two levels of interfaces (3) distributed in a stepped manner. Each interface (3) is provided with an external thread structure. The outer diameter of each interface (3) gradually decreases in the direction away from the connecting nozzle (1). The pressure testing nozzle can be threadedly connected to pipe openings of different diameters through each level of interface (3).
2. The multi-purpose pressure gauge structure according to claim 1, characterized in that: In two adjacent interfaces (3), the minor diameter of the external thread on the higher-level interface (3) is greater than the major diameter of the external thread on the lower-level interface (3).
3. The multi-purpose pressure gauge structure according to claim 2, characterized in that: The interfaces (3) at each level on the threaded part (2) are arranged concentrically.
4. The multi-purpose pressure testing nozzle structure according to claim 1, characterized in that: A locking nut (4) is provided between the connecting nozzle (1) and the threaded part (2).
5. The multi-purpose pressure testing nozzle structure according to claim 1, characterized in that: Each interface (3) has a seal on the end near the connector (1).
6. The multi-purpose pressure testing nozzle structure according to claim 5, characterized in that: The sealing element is an elastic sealing ring (5), and the outer diameter of the sealing ring (5) is larger than the major diameter of the external thread of the interface (3).
7. The multi-purpose pressure testing nozzle structure according to claim 6, characterized in that: Each interface (3) has an annular groove (6) at the end near the connector (1), and the sealing ring (5) is correspondingly fitted into the annular groove (6).
8. The multi-purpose pressure gauge structure according to claim 6, characterized in that: In the two adjacent interfaces (3), the outer diameter of the sealing ring (5) on the lower interface (3) is larger than the minor diameter of the external thread on the higher interface (3); when the higher interface (3) is connected to the pipe opening of the device under test, the sealing ring (5) on the lower interface (3) is deformed by pressure and adheres tightly to the inner wall of the pipe opening of the device under test.
9. The multi-purpose pressure testing nozzle structure according to claim 8, characterized in that: An elastic ring (7) is embedded at the end of the lowest level interface (3) away from the connecting nozzle (1); the outer diameter of the elastic ring (7) is larger than the minor diameter of the external thread on the lowest level interface (3) and smaller than the major diameter of the external thread on the lowest level interface (3).