Pipeline rapid sampling valve supporting non-stop gas operation and operation method

Abstract

The invention relates to the technical field of operation and maintenance of high-pressure gas insulated electrical equipment, and particularly discloses a pipeline rapid sampling valve supporting non-stop gas operation and an operation method. The valve comprises a valve body, an air inlet valve, an air outlet valve, a detection valve and a detection port assembly, wherein an air inlet cavity, an air outlet cavity and a detection cavity which are communicated with one another are arranged in the valve body. The detection port assembly adopts an automatic sealing design and comprises a connector shell, a valve element and a reset spring, and leakage-free insertion and extraction of a detection probe are achieved. The valve is also integrated with a pressure gauge to monitor the system pressure, and the detection cavity adopts a tapered flow channel and is provided with a spiral vortex guide plate to ensure the representativeness of the sampled gas. According to the operation method, the three independent valves are controlled, so that on-line sampling is completed under the condition that main inflation is uninterrupted. According to the invention, the problems of low efficiency and gas leakage risk caused by interruption of operation and disassembly of a joint in a traditional sampling mode are solved, and the safety and working efficiency of sampling operation are remarkably improved.

Description

Technical Field

[0001] This invention relates to the field of operation and maintenance technology for high-voltage gas-insulated electrical equipment, specifically to a pipeline rapid sampling valve and its operation method that supports uninterrupted gas supply. Background Technology

[0002] In the daily operation and maintenance of substations and SF6 gas processing centers, frequent checks are required on parameters such as moisture content and purity of the gas in cylinders when filling electrical equipment or storing recovered gas. Currently, the standard operating procedure for sampling requires first interrupting the gas supply and completely disassembling the filling connector on the cylinder or pipeline before installing the corresponding sampling connector for the testing instrument. After testing is completed, the original filling circuit must be restored. This traditional operating mode is not only cumbersome and time-consuming, but also inevitably exacerbates the wear and tear on sealing elements during each disassembly process, creating a potential hazard for the leakage of SF6, a strong greenhouse gas.

[0003] The existing technology has three significant drawbacks: First, frequent disassembly and assembly lead to low work efficiency, severely impacting the overall progress of the inflation operation; second, repeated tightening of mechanical joints accelerates the wear of the sealing rings, significantly reducing sealing reliability; third, during disassembly and connection, the system is in an open state, making it highly susceptible to gas leakage, posing both safety risks and failing to meet environmental protection requirements. These drawbacks collectively restrict the improvement of equipment operation and maintenance efficiency, and also increase operating costs and safety risks.

[0004] To address the above shortcomings, there is an urgent need to develop an innovative solution that can achieve rapid and safe sampling without interrupting the gas supply or disassembling the main pipeline joints. Summary of the Invention

[0005] (a) Technical problems to be solved This invention achieves safe online sampling without interruption of gas flow during SF6 gas filling by integrating a three-way valve body structure with an automatically sealed rapid detection port. This completely solves the problems of low efficiency and gas leakage risk caused by the need to interrupt operations and disassemble connectors in traditional sampling methods.

[0006] (II) Technical Solution To achieve the aforementioned integrated three-way valve body structure and automatic sealing rapid detection port, enabling safe online sampling without interrupting SF6 gas filling, this invention provides the following technical solution: This invention provides a pipeline rapid sampling valve that supports uninterrupted gas flow operation, comprising: The valve body contains an inlet chamber, an outlet chamber, and a detection chamber that are interconnected. An intake valve is installed on the intake chamber channel; An air outlet valve is installed on the air outlet chamber channel; The detection valve is installed on the detection chamber channel, and the inlet valve, outlet valve and detection valve are controlled independently of each other; The detection port assembly is connected downstream of the detection valve; the detection port assembly includes a connector housing, a valve core slidably disposed within the connector housing, and a return spring that provides a forward reset preload force to the valve core (52); The valve core, under the action of the return spring, forms a sealing fit between its front end sealing part and the connector housing; when the external detection probe is inserted into the detection port assembly, it pushes the valve core to move backward against the preload force of the return spring, so as to open the airflow channel from the detection chamber to the detection probe.

[0007] The inlet valve, outlet valve, and detection valve are all needle-type shut-off valves that can achieve precise flow regulation.

[0008] The valve body also integrates a pressure gauge for monitoring the pressure inside the valve body. The pressure gauge can be selectively connected to or disconnected from the internal cavity of the valve body through a pressure gauge isolation valve.

[0009] The flow channel of the detection chamber is a tapered flow channel, and its cross-sectional area gradually shrinks from the inlet of the detection chamber toward the detection valve. A spiral vortex guide plate is fixedly installed inside the tapered flow channel.

[0010] The air inlet valve has a CGA320 standard threaded interface suitable for SF6 gas cylinders, and its interface is equipped with a series double sealing ring structure, including a fluororubber sealing ring as the main seal and a polytetrafluoroethylene sealing ring as the auxiliary seal.

[0011] The detection port assembly is a compression fitting quick connector, and the inner wall of the connector housing is provided with at least one dynamic sealing ring for sealing the outer wall of the probe after the detection probe is inserted; the sealing part at the front end of the valve core is provided with a one-way valve sealing ring made of perfluoroether rubber material.

[0012] Another aspect of the present invention provides a method for non-stop gas sampling using a pipeline rapid sampling valve as described in any one aspect, comprising the following steps: Main inflation step: Open the air inlet valve and the air outlet valve to establish the main inflation path from the air inlet to the air outlet and perform uninterrupted inflation; Online sampling steps: With the main inflation passage kept unobstructed, the detection valve is opened to divert a portion of the main airflow, which then flows through the detection chamber and detection port assembly before entering the external detection equipment; Sampling termination procedure: Close the detection valve, and then disconnect the external detection device from the detection port assembly. The detection port assembly automatically seals upon disconnection.

[0013] The step of "opening the detection valve" includes: slightly opening the detection valve by rotating it counterclockwise by 1 / 8 to 1 / 4 turn, and finely adjusting the opening of the detection valve according to the feedback from the external detection device, so that the flow rate of the diverted gas is controlled to be 5% to 10% of the flow rate of the main gas.

[0014] The process, which includes inflation and sampling, also includes a system depressurization step: Shut down the air supply and the air intake valve; Slowly open the detection valve to release the residual gas in the valve body through the detection port assembly until the reading of the integrated pressure gauge returns to zero. Close all valves and disconnect the connecting pipes.

[0015] (III) Beneficial Effects Compared with the prior art, the present invention provides a pipeline rapid sampling valve and operating method that supports uninterrupted gas flow operation, and has the following beneficial effects: This pipeline rapid sampling valve and operating method, which supports uninterrupted gas supply, achieves safe online sampling under conditions of no interruption in the main gas charging process through the integrated three-way valve body structure and the design of an automatic sealing rapid detection port, combined with the synergistic effect of a tapered flow channel and a spiral guide plate. This not only differs from traditional cumbersome sampling methods, but also completely eliminates the risk of SF6 gas leakage through multiple sealing guarantees, while ensuring the representativeness of the sampled gas, providing accurate and reliable technical support for the gas condition assessment of high-voltage electrical equipment. Attached Figure Description

[0016] Figure 1 This is a schematic diagram of the structure of the present invention.

[0017] In the diagram: 1. Valve body; 2. Inlet valve; 21. Fluororubber sealing ring; 22. Polytetrafluoroethylene sealing ring; 3. Outlet valve; 4. Detection valve; 5. Detection port assembly; 51. Connector housing; 52. Valve core; 53. Return spring; 54. Eddy current guide plate; 55. Dynamic sealing ring; 56. Check valve sealing ring; 6. Pressure gauge. Detailed Implementation

[0018] The present invention will now be described in detail with reference to the accompanying drawings and specific embodiments.

[0019] Please see Figure 1The first embodiment of this invention provides a pipeline rapid sampling valve that supports uninterrupted gas flow operation. The core of this valve lies in its unique structural configuration, which enables online uninterrupted gas flow sampling during the SF6 gas filling process, completely changing the traditional sampling mode that requires interrupting operations.

[0020] As the core pressure-bearing component of the entire device, valve body 1 is integrally forged from 316 stainless steel, possessing not only excellent mechanical strength but also resistance to corrosion from SF6 gas and its potential decomposition products. The interior of valve body 1 is precision-machined to form interconnected inlet, outlet, and detection chambers, which converge at the main flow channel, forming a stable three-way structure. This integrated design avoids potential leakage points caused by multiple component connections, ensuring the overall sealing reliability of the structure.

[0021] An intake valve 2 is installed in the intake chamber channel, an outlet valve 3 is installed in the outlet chamber channel, and a detection valve 4 is installed in the detection chamber channel. These three valves are independently controlled and employ a needle-type gate valve structure. The choice of this valve type is of significant technical importance: the valve core of the needle valve is conical, and through linear sealing with the valve seat, coupled with a fine-pitch thread transmission mechanism, it can achieve fine-tuning of the opening by less than 1 / 4 turn, providing a structural basis for precise control of the diverted flow rate. In contrast, ordinary ball valves or gate valves cannot achieve such precise flow regulation.

[0022] It is particularly important to note that the downstream of the detection valve 4 is a detection port assembly 5, which is crucial for achieving "non-stop airflow" operation. The detection port assembly 5 includes a connector housing 51, a valve core 52 axially slidably disposed within the connector housing 51, and a return spring 53 providing a forward reset preload force for the valve core 52. Under the action of the return spring 53, the sealing part at the front end of the valve core 52 forms a tight sealing fit with the connector housing 51, ensuring that the detection channel is completely sealed when not sampling.

[0023] When sampling is required, the external detection probe is inserted into the detection port assembly 5. The tip of the probe pushes the valve core 52 backward against the preload of the return spring 53, thereby opening the airflow channel from the detection chamber to the detection probe. This connection process is completed in a sealed state, completely preventing gas leakage. Conversely, when the detection probe is disassembled, the return spring 53 drives the valve core 52 to quickly return to its original position, re-establishing a seal in a short time, achieving safe operation of "connection equals conduction, disconnection equals sealing".

[0024] In actual high-pressure gas conditions, simple spring-reset check valves may experience reset lag or poor sealing after long-term and frequent use. To solve this problem, the present invention further optimizes the detection port assembly 5: an auxiliary sealing structure is set at the mating gap between the valve core 52 and the connector housing 51, adopting a stepped sealing design, which effectively prevents sealing failure caused by particulate impurities.

[0025] To further enhance the safety monitoring capabilities of the equipment, a mechanical pressure gauge 6 is integrated on the valve body 1, with a range of 0-1 MPa, capable of displaying the gas pressure inside the valve body in real time. The pressure gauge 6 is connected to the internal cavity of the valve body 1 through a pressure gauge isolation valve. This design allows the pressure gauge to be isolated from the system when calibration or replacement is required, greatly improving the maintainability of the equipment and avoiding the drawback of having to replace the entire device when a traditional integrated pressure gauge is damaged.

[0026] In the flow channel design of the detection chamber, this invention adopts a unique tapering flow channel structure, whose cross-sectional area gradually shrinks from the inlet of the detection chamber towards the detection valve 4. This design is based on the Venturi effect principle: when the airflow passes through the tapering section, the flow velocity increases while the static pressure decreases, forming a natural low-pressure zone in front of the detection valve, creating a stable pressure difference with the mainstream passage, and providing an internal driving force for flow diversion. More importantly, a spiral vortex guide plate 54 is fixedly installed inside the tapering flow channel, with its spiral angle controlled between 30° and 60°. The vortex guide plate 54 causes the flowing gas to generate a rotating vortex, which greatly enhances the radial mixing of the gas, ensures the high uniformity of the sampled gas composition, effectively avoids the influence of the "dead zone gas" near the wall in laminar flow on the detection results, and significantly improves the representativeness of the sample.

[0027] Regarding interface sealing, this invention employs a multi-layered sealing design. The inlet interface of the intake valve 2 adopts a CGA320 standard threaded interface suitable for SF6 gas cylinders, and its interface innovatively features a series-connected double sealing ring structure, including a fluororubber sealing ring 21 as the main seal and a polytetrafluoroethylene (PTFE) sealing ring 22 as the auxiliary seal. Fluororubber has good elastic recovery and sealing performance, while PTFE has superior aging resistance and self-lubricating properties. The two complement each other, ensuring that even if the main sealing ring experiences slight wear after long-term use, the auxiliary sealing ring can still provide a reliable backup seal.

[0028] The detection port assembly 5 adopts a compression fitting quick-connect structure, and its connector housing 51 has at least one dynamic sealing ring 55 on its inner wall for sealing the outer wall of the detection probe after insertion. The sealing part at the front end of the valve core 52 is equipped with a one-way valve sealing ring 56 made of perfluoroether rubber. Perfluoroether rubber (FFKM) is the best chemically resistant elastomer material to date, exhibiting excellent chemical inertness to SF6 gas and its decomposition products, while also possessing extremely low gas permeability and excellent high-temperature resistance, ensuring reliable sealing during long-term use.

[0029] The second embodiment of the present invention provides a method for non-stop gas sampling using the pipeline rapid sampling valve in the first embodiment. This method ensures the safety and reliability of the sampling process through standardized operating procedures.

[0030] During the initial preparation phase, first confirm that all valves (inlet valve 2, outlet valve 3, and detection valve 4) are fully closed, and close the SF6 cylinder valve. Connect the inlet of the valve to the outlet of the SF6 cylinder valve using a CGA320 quick-connect coupling and tighten it. Connect the outlet to the charging hose leading to the electrical equipment using the appropriate adapter. Observe the integrated pressure gauge 6 and confirm that the reading is zero, ensuring that the system is in a safe state.

[0031] When establishing the main charging path, slowly open the SF6 cylinder valve, then slowly rotate the inlet valve 2, observing the pressure gauge 6 reading rise to the cylinder pressure. After confirming that the system has no leaks and the pressure is normal, slowly open the outlet valve 3. At this point, the main charging path is established, and normal charging of electrical equipment begins. This step-by-step opening method avoids the impact of pressure surges on the system and sealing components.

[0032] During non-stop gas sampling, ensure that the outlet valve 3 remains open throughout the main inflation process. Connect the sampling line of the testing instrument to the quick-connect fitting of the testing port assembly 5; a "click" sound indicates that it is properly locked. Slowly rotate the testing valve 4 counterclockwise by approximately 1 / 8 to 1 / 4 turn to slightly open it, and confirm the gas flow by checking the instrument reading. Depending on the requirements of the testing instrument, the opening of the testing valve 4 can be further fine-tuned to control the diverted gas flow rate to 5% to 10% of the main gas flow rate. This precise flow control ensures that the impact of the sampling process on the main inflation process is minimized, and the pressure fluctuation in the main passage can be controlled within 2%.

[0033] The above description is merely an embodiment of the present invention and does not limit the patent scope of the present invention. Any equivalent structural or procedural transformations made based on the content of the present invention's specification and drawings, or direct or indirect applications in other related technical fields, are similarly included within the patent protection scope of the present invention.

Claims

1. A pipeline pigging valve supporting hot-line operation, characterized in that The utility model relates to a kind of valve, comprising: Valve body (1), which is formed with intake cavity, outlet cavity and detection cavity communicating with each other; Intake valve (2) arranged on the passage of the intake cavity; Outlet valve (3) arranged on the passage of the outlet cavity; Detection valve (4) arranged on the passage of the detection cavity, the intake valve (2), outlet valve (3) and detection valve (4) are independently controlled; Detection port assembly (5) connected downstream of the detection valve (4); the detection port assembly (5) includes joint housing (51), valve core (52) arranged axially slidably in the joint housing (51), and reset spring (53) providing forward reset pre-tightening force for the valve core (52); Wherein, the valve core (52) forms sealing cooperation with the joint housing (51) at the sealing part of its front end under the action of the reset spring (53); when external detection probe is inserted into the detection port assembly (5), the valve core (52) is pushed to move backward against the pre-tightening force of the reset spring (53), to open the airflow passage from the detection cavity to the detection probe.

2. A rapid-sampling valve for a pipeline supporting no-break operation according to claim 1, characterized in that: The intake valve (2), outlet valve (3) and detection valve (4) are all needle-shaped stop valves capable of realizing fine flow regulation.

3. A rapid-sampling valve for a pipeline that supports no-stop operation according to claim 1, characterized in that: The valve body (1) is also integrated with pressure gauge (6) for monitoring pressure in the valve body, and the pressure gauge (6) is selectively communicated or cut off with the internal cavity of the valve body (1) through an isolation valve.

4. The rapid-sampling valve for a pipeline with non-stop gas operation according to claim 1, characterized in that: The flow passage of the detection cavity is a tapered flow passage, and the cross-sectional area of the flow passage gradually shrinks from the inlet of the detection cavity to the detection valve (4); A spiral vortex guide plate (54) is fixedly arranged in the tapered flow passage.

5. The quick draw valve of claim 1, wherein: The intake end interface of the intake valve (2) is a CGA320 standard threaded interface suitable for SF6 gas cylinder, and a series double sealing ring structure is arranged at the interface, including fluororubber sealing ring (21) as main sealing and polytetrafluoroethylene sealing ring (22) as auxiliary sealing.

6. A pipe pick-up valve for supporting no-stop operation according to claim 1, characterized in that: The detection port assembly (5) is a snap-on quick connector, and at least one dynamic sealing ring (55) is further arranged on the inner wall of the joint housing (51) for sealing the outer wall of the detection probe after the probe is inserted; the sealing part at the front end of the valve core (52) is provided with one-way valve sealing ring (56) made of perfluoroether rubber material.

7. A method of taking a sample without stopping the flow of gas using the rapid sampling valve of any one of claims 1 to 6, wherein, The utility model relates to a kind of valve, comprising: Main inflation step: opening the intake valve (2) and the outlet valve (3), establishing main inflation passage from intake port to outlet port, and carrying out uninterrupted inflation; Online sampling step: under the condition that the main inflation passage remains unobstructed, opening the detection valve (4), so that part of main airflow is shunted, enters external detection equipment after flowing through the detection cavity and detection port assembly (5); Sampling termination step: closing the detection valve (4), and then disconnecting the external detection equipment from the detection port assembly (5), and the detection port assembly (5) is automatically sealed at the moment of disconnection.

8. The method of claim 7, wherein, The step of "opening the detection valve (4)" includes: rotating the detection valve (4) counterclockwise by 1 / 8 to 1 / 4 turn for micro-opening, and finely adjusting the opening degree of the detection valve (4) according to the feedback of the external detection device, so that the shunt gas flow is controlled to be 5% to 10% of the main gas flow.

9. The method of claim 7, wherein, After all the inflation and sampling operations are completed, the system pressure relief step is further included: Close the gas source and the inlet valve (2); Slowly open the detection valve (4) to release the residual gas in the valve body (1) through the detection port assembly (5) until the pressure gauge (6) reads zero; Close all valves and remove the connecting pipeline.

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