Exhaust valve detection device and detection method

Abstract

The application discloses an exhaust valve detection device and a detection method, and belongs to the technical field of valve detection equipment. The detection device comprises a detection pipeline, a water inlet, an air inlet and an energy storage device. The detection pipeline forms a sealed test pipeline. The water inlet is communicated with the detection pipeline and is used for introducing water into the detection pipeline. The air inlet is communicated with the detection pipeline and is used for communicating a high-pressure gas source. The energy storage device is communicated with the detection pipeline, and the volume of liquid input into the energy storage device is proportional to the pressure of the liquid. The detected exhaust valve is communicated with the detection pipeline. The device has significant improvement in operation convenience, detection efficiency, structural optimization and automation capacity compared with the prior art.

Description

Technical Field

[0001] This invention belongs to the field of valve testing equipment technology, and particularly relates to an exhaust valve testing device and testing method. Background Technology

[0002] An air release valve is a device used to remove air or other gases from a pipeline or equipment system. It prevents operational malfunctions and safety hazards caused by gas accumulation, ensuring the normal operation and efficiency of the system. Service life testing of air release valves is crucial to ensuring their sealing performance and sensitivity. Regular testing can promptly detect problems such as valve aging, leakage, or failure, preventing equipment downtime or accidents due to valve malfunctions, improving system safety and reliability, and extending the overall service life of the equipment.

[0003] Currently, testing exhaust valves typically requires at least 1000 on / off cycles. This is achieved by alternately injecting water and gas into the testing pipeline containing the exhaust valve under test, i.e., by repeatedly opening and closing two valves. Figure 3 The device uses valves 1 and 2 to adjust the liquid level inside the exhaust valve according to the gas-liquid flow, causing the exhaust valve to open and close to release gas and prevent leakage, thus assessing the valve's venting and sealing performance. However, this detection device has several drawbacks: First, it requires simultaneous control of two valves to complete one detection cycle, making the operation complex; second, frequent valve switching can easily lead to a decrease in system sealing, increasing the possibility of leakage and affecting detection accuracy; furthermore, the device has high requirements for valve operation time and flow control, and inaccurate control can easily lead to cross-contamination of gas and liquid pipelines; in addition, the existing device has a low level of automation and intelligence, making it difficult to achieve long-term continuous and stable detection, and its maintenance costs are high, limiting its application in large-scale and high-frequency detection. In summary, the existing exhaust valve detection device urgently needs technological improvements to simplify the operation process, improve detection accuracy, and enhance system stability. Summary of the Invention

[0004] In view of the problems of complex operation, error-proneness, poor sealing, low detection accuracy and insufficient automation in the existing technology of exhaust valve detection, the present invention provides an exhaust valve detection device and detection method.

[0005] This invention is implemented as follows: an exhaust valve testing device, characterized in that it includes a testing pipeline, a water inlet, an air inlet, and an energy storage device; the testing pipeline forms a sealed test pipeline; the water inlet is connected to the testing pipeline and is used to introduce water into the testing pipeline; the air inlet is connected to the testing pipeline and is used to connect to a high-pressure air source; the energy storage device is connected to the testing pipeline and the volume of liquid input therein is proportional to its pressure on the liquid; the exhaust valve being tested is connected to the testing pipeline.

[0006] In the above technical solution, preferably, a first valve is installed between the water inlet and the detection pipeline, and the first valve is used to control the on / off connection between the water inlet and the detection pipeline.

[0007] In the above technical solution, preferably, a second valve is installed between the air inlet and the detection pipeline, and the second valve is used to control the connection and disconnection between the air inlet and the detection pipeline.

[0008] In the above technical solution, preferably, the detection pipeline is connected to a pressure gauge used to monitor the gas pressure inside the detection pipeline.

[0009] In the above technical solution, preferably, a first one-way valve is provided between the water inlet and the detection pipeline.

[0010] In the above technical solution, preferably, a backflow preventer consisting of two one-way valves is provided between the air inlet and the detection pipeline.

[0011] In the above technical solution, preferably, a second one-way valve and a third one-way valve are provided between the air inlet and the detection pipeline, the second one-way valve and the third one-way valve are connected to a first drain pipe, and a third valve is installed on the first drain pipe, the third valve controlling the opening and closing of the first drain pipe.

[0012] In the above technical solution, preferably, the detection pipeline is connected to the second drain pipe, the second drain pipe is equipped with a fourth valve, and the fourth valve controls the opening and closing of the second drain pipe.

[0013] In the above technical solution, preferably, the first drain pipe and the second drain pipe are respectively disposed at both ends of the detection pipeline.

[0014] This exhaust valve detection device has been optimized in structure and control method compared with the existing technology, and has significant advantages and effects.

[0015] First, during the testing process, water only needs to be filled into the testing pipeline through the water inlet before the first test. All subsequent cyclic tests are completed by controlling the air inlet valve. Unlike traditional devices, there is no need to repeatedly switch between the water inlet and air inlet valves, which greatly simplifies the operation steps and reduces the frequency of manual intervention.

[0016] Secondly, the energy storage device can automatically adjust the liquid level in the exhaust valve according to changes in gas pressure, enabling continuous and multiple cyclic detections. This significantly shortens the single detection cycle and improves overall detection efficiency, making it particularly suitable for repeated exhaust valve venting and closing detection tasks. Furthermore, since the detection process no longer relies on frequent switching between liquid and gas paths, the entire system has a more compact structure, simpler piping layout, occupies less space, and is easier to install and maintain.

[0017] Overall, this device represents a significant improvement over existing technologies in terms of ease of operation, detection efficiency, structural optimization, and automation capabilities. Attached Figure Description

[0018] Figure 1 This is a schematic diagram of the structure of the present invention; Figure 2 This is a schematic diagram of the present invention; Figure 3 This is a schematic diagram of existing technology. Detailed Implementation

[0019] To make the objectives, technical solutions, and advantages of this invention clearer, the invention will be further described in detail below with reference to embodiments. It should be understood that the specific embodiments described herein are merely illustrative and not intended to limit the invention.

[0020] To address the problems of complex operation, error-proneness, poor sealing, low detection accuracy, and insufficient automation in existing exhaust valve testing technologies, this invention provides an exhaust valve testing device and method. To further illustrate the structure of this invention, a detailed description is provided below in conjunction with the accompanying drawings: Example 1 Please see Figure 1 and Figure 2 An exhaust valve detection device includes a detection pipeline 1, a water inlet 2, an air inlet 3, and an energy storage device 4.

[0021] The testing pipeline forms a sealed test pipeline. That is, the testing pipeline constitutes a sealed test loop, used to connect the water inlet, air inlet, exhaust valve and related valves, energy storage device, and pressure monitoring device. This pipeline must ensure no leakage occurs during the test, ensuring accurate and controllable pressure and flow state of the internal fluids (liquid and gas). The testing pipeline should be made of metal or engineering plastic materials that meet pressure testing requirements, possessing good corrosion resistance and wear resistance, and meeting the need to withstand repeated pressure changes during multiple test cycles.

[0022] The inlet is connected to the detection pipeline and is used to introduce water into the detection pipeline. After the vent valve releases gas, it closes to prevent water leakage, creating a low pressure P1 inside the pipeline system. A first valve 5 is installed between the inlet and the detection pipeline to control the flow between them and ensure the system pressure P1. A first check valve 6 is installed between the inlet and the detection pipeline to prevent backflow and contamination of the incoming water. The inlet and the detection pipeline are connected by a flange or threaded connection to achieve a reliable seal, ensuring no leakage and a secure connection during water injection. The first check valve is preferably a spring-loaded check valve, which is compact, responsive, and effectively prevents backflow, ensuring unidirectional flow.

[0023] The air inlet is connected to the detection pipeline and is used to connect to a high-pressure gas source. A second valve 7 is installed between the air inlet and the detection pipeline. The second valve is used to control the opening and closing of the air inlet and the detection pipeline, inputting high-pressure gas into the system and increasing the pipeline system pressure P2. The high-pressure gas source can be an air compressor, and the pressure is adjustable. In this technical solution, the type of high-pressure gas source is not limited; air or other gases, such as nitrogen, can be used.

[0024] The energy storage device is connected to the detection pipeline, and the volume of the liquid input into it is proportional to its pressure on the liquid. The energy storage device is typically a bladder-type accumulator, also known as a gas tank in existing technology. It can generate spatial changes when the pressure in the pipeline system changes. For example, when the pressure changes from P1 to P2, the volume of the bladder will change from V1 to V2, causing a volume change of V2-V1 in the pipeline system. High-pressure gas enters the pipeline system and quickly flows into the exhaust valve at the highest point. When there is enough gas in the exhaust valve, it opens to release the gas, accompanied by an exhaust sound. The exhaust can also be detected by a wind gauge. When the inlet valve closes, the gas in the pipeline system is released, and the pipeline system pressure P2 decreases to P1. Due to the pressure change, the volume of the bladder changes, pushing the liquid level in the exhaust valve to rise. The exhaust valve closes to prevent the medium water from flowing out. Observe that there is no leakage when the exhaust valve is closed; one test cycle is completed.

[0025] The energy storage device is sealed to the detection pipeline via flanges or threaded interfaces, with pressure-resistant sealing rings at the connections to ensure no leakage of liquid or gas. The connecting pipelines typically use rigid pipes or high-pressure hoses to ensure unobstructed transmission and meet pressure requirements. The device layout should facilitate maintenance and not interfere with the normal flow of the detection pipeline. Simultaneously, it should ensure that the change in liquid volume within the energy storage device is linearly proportional to the liquid pressure in the detection pipeline, thereby effectively stabilizing pressure fluctuations within the detection pipeline and improving the accuracy and repeatability of the detection device.

[0026] The exhaust valve 15 being tested is connected to the testing pipeline. The exhaust valve being tested is connected to the testing pipeline via a flange connection or a threaded connection to ensure a reliable seal at the interface and prevent gas or liquid leakage.

[0027] The detection pipeline is connected to pressure gauge 8, which is used to monitor the gas pressure inside the pipeline. The detection pipeline is connected to the pressure gauge via a branch pipe, which is sealed to the main pipeline using a flange or threaded interface to ensure airtightness and accurate pressure transmission. The pressure gauge is a mechanical or digital pressure gauge suitable for gas pressure measurement, with a range covering the maximum working pressure of the detection pipeline. It features high accuracy and rapid response, and can reflect changes in the gas pressure inside the pipeline in real time, providing reliable data support for the performance evaluation of the exhaust valve.

[0028] A one-way valve is installed between the air inlet and the detection pipeline. Specifically, a second one-way valve 9 and a third one-way valve 10 are installed between the air inlet and the detection pipeline. A first drain pipe 11 is connected between the second and third one-way valves. A third valve 12 is installed on the first drain pipe, and the third valve controls the opening and closing of the first drain pipe. The two one-way valves and the third valve for venting form a simple backflow preventer. The air inlet and the detection pipeline are connected by a flange or threaded connection to ensure airtightness and connection stability, and to withstand the pressure of a high-pressure air source. It is recommended that the second valve be a high-pressure resistant solenoid valve or a pneumatic ball valve with quick opening and closing functions to achieve precise control of the airflow between the air inlet and the detection pipeline. The second and third one-way valves are preferably spring-loaded check valves, which are responsive, compact, and can effectively prevent gas backflow. The first drain pipe is connected between the second and third one-way valves, using pressure-resistant and corrosion-resistant pipe material, and is connected to the one-way valves through a flange or quick-connect fitting to ensure smooth drainage. The third valve installed on the first drain pipe is recommended to be a corrosion-resistant manual butterfly valve or ball valve to control the drainage flow. The two check valves, together with this third venting valve, form a simple and reliable backflow preventer to prevent high-pressure gas backflow and protect the system.

[0029] The detection pipeline is connected to the second drain pipe 13, and the second drain pipe is equipped with a fourth valve 14, which controls the opening and closing of the second drain pipe. The first drain pipe and the second drain pipe are respectively located at both ends of the detection pipeline.

[0030] The first and second drain pipes are located at opposite ends of the testing pipeline, effectively draining accumulated water and gas to ensure the normal operation and accurate measurement of the testing system. The first drain pipe, situated between two one-way valves, works in conjunction with the vent valve to prevent backflow, promptly removing any potentially trapped liquid or gas and preventing backflow from affecting the system. The second drain pipe serves as the discharge channel at the other end of the testing pipeline, facilitating the removal and maintenance of any residual liquid or gas within the system. Arranging two drain pipes at both ends of the pipeline achieves comprehensive drainage and venting coverage, ensuring smooth fluid flow and stable pressure within the pipeline. It also facilitates regular cleaning and maintenance, improving the system's reliability and lifespan.

[0031] The working principle of the exhaust valve detection device is as follows: Step 1: The air vent valve is initially open. With all other valves closed, open the first valve and inject water into the detection pipeline through the inlet. The water flows into the air vent valve and the energy storage device being tested. As the liquid level rises, the float inside the air vent valve rises accordingly until the air vent valve closes, and then the first valve is closed. At this point, an initial pressure P1 is formed in the energy storage device.

[0032] Step 2: Open the second valve to pressurize the detection pipeline through the inlet, ensuring the gas pressure reaches P2, which is greater than P1. The high-pressure gas enters the detection pipeline and the tested exhaust valve, pushing the liquid towards the accumulator. This causes the liquid level in the exhaust valve to drop, the float to descend, and the exhaust valve to open and release gas. After closing the second valve, the gas is discharged from the exhaust valve, the pressure in the accumulator returns to P1, the liquid is forced out of the accumulator and flows back to the exhaust valve, the liquid level rises, and the exhaust valve closes. Complete one test and check that the exhaust valve is leak-free.

[0033] Repeat the above steps to perform multiple cyclic tests on the exhaust valve, which can continuously complete up to 1000 tests, ensuring the stability and reliability of the test.

[0034] Example 2 This embodiment further describes the specific steps of the exhaust valve detection method.

[0035] I. Initial Preparations and System Setup (Establishing Initial State) Valve status check: Ensure that valve 7 (second valve), valve 12 (third valve), and valve 14 (fourth valve) are closed. Air vent valve 15 is initially open.

[0036] Water injection operation: Open the first valve 5. Inject water into the detection pipeline 1 through the water inlet 2. The water flows into both the detection pipeline 1 and the energy storage device 4.

[0037] Air vent valve closure and initial pressure establishment: As the liquid level in the detection pipeline rises, the float in the air vent valve 15 rises accordingly until the air vent valve 15 closes to prevent water leakage.

[0038] Initial state lockout: At this time, the first valve 5 is closed. A low-pressure state is formed inside the detection pipeline system, and an initial pressure P1 for the liquid is formed in the energy storage device 4. The pressure gauge 8 displays this initial pressure.

[0039] II. Air pressure driven opening (exhaust process) Input high-pressure gas: Open the second valve. Input high-pressure gas 6 into the detection pipeline 1 through the high-pressure gas source connected to the inlet 3.

[0040] Pressure rise: The gas pressure in the pipeline system rises rapidly to the target pressure P2, where P2 must be greater than P1. Pressure gauge 8 monitors this change in real time.

[0041] Liquid level drop and vent valve opening: High-pressure gas enters detection line 1 and pushes the liquid in the line towards the energy storage device 4. Since the liquid volume of the energy storage device is proportional to its pressure on the liquid, the inflow of liquid causes the volume of the energy storage device to change from V1 to V2. The liquid is displaced, causing the liquid level in vent valve 15 to drop, the float to descend, and the vent valve to open and begin venting. Venting can be observed by sound or detected by the air pressure gauge.

[0042] III. Energy storage reset shutdown (leakage prevention check) Stop pressurizing: Close the second valve 7.

[0043] Gas discharge and pressure drop: High-pressure gas in the pipeline system continues to be discharged from the exhaust valve 15.

[0044] Energy storage device reset and vent valve closure: The internal pressure of the pipeline system decreases from P2 to P1. Due to the change in internal pressure, the energy storage device 4 (such as a bladder-type accumulator 27) contracts in volume, squeezing out the stored liquid, which flows back to the vent valve 15. This pushes the liquid level in the vent valve up, causing the vent valve 15 to close quickly, preventing the medium water from flowing out.

[0045] Inspection complete: After observing that there is no water leakage after the exhaust valve 15 is closed, one test cycle is completed.

[0046] IV. Repeated Cyclic Testing: To test the service life and reliability of the exhaust valve, repeat steps 1 and 2 above.

[0047] This device only needs to be filled with water through the inlet before the first test. All subsequent cycle tests are completed by controlling the air inlet valve, eliminating the need to repeatedly switch between the water and air inlet valves as with traditional devices. This allows for continuous and stable testing, enabling up to 1000 cycle tests.

[0048] The above description is merely a preferred embodiment of the present invention and is not intended to limit the present invention. Any modifications, equivalent substitutions, and improvements made within the spirit and principles of the present invention should be included within the protection scope of the present invention.

Claims

1. A method for detecting an exhaust valve, the method utilizing an exhaust valve detection device to achieve cyclic detection of the exhaust valve by controlling the on / off state of a high-pressure gas source, the exhaust valve detection device comprising: The test pipeline forms a sealed test pipeline; A water inlet, which is connected to the detection pipeline and is used to introduce water into the detection pipeline; An air inlet, which is connected to the detection pipeline and used to connect to a high-pressure air source; An energy storage device, wherein the energy storage device is connected to the detection pipeline and the volume of liquid input therein is proportional to the pressure of the liquid. The exhaust valve being tested is connected to the testing pipeline; The exhaust valve detection method includes the following steps: S1. Establish initial state: Water is injected into the detection pipeline through the inlet until the vent valve being detected closes due to the rise in liquid level, so that an initial pressure P1 is formed in the energy storage device. S2. Pneumatic-driven opening: High-pressure gas is input into the detection pipeline through the air inlet, causing the pressure in the pipeline to rise to P2; P2 > P1; The high-pressure gas drives liquid to flow into the energy storage device, causing the liquid level in the exhaust valve to drop, thus opening the exhaust valve and releasing the gas; S3. Energy Storage Reset and Closure: After the high-pressure gas input is shut off, the gas in the detection pipeline is discharged, and the pressure drops to P1; the energy storage device releases the stored liquid, pushing the liquid level in the exhaust valve to rise, thereby closing the exhaust valve; S4. Waterless circulation: Repeat steps S2 and S3 to achieve multiple opening and closing cycles of the exhaust valve by controlling the opening and closing of the air inlet.

2. The exhaust valve detection method according to claim 1, characterized in that: A first valve is installed between the water inlet and the detection pipeline. The first valve is used to control the connection and disconnection between the water inlet and the detection pipeline.

3. The exhaust valve detection method according to claim 1, characterized in that: A second valve is installed between the air inlet and the detection pipeline. The second valve is used to control the connection and disconnection between the air inlet and the detection pipeline.

4. The exhaust valve detection method according to claim 1, characterized in that: The detection pipeline is connected to a pressure gauge used to monitor the gas pressure inside the detection pipeline.

5. The exhaust valve detection method according to claim 1, characterized in that: A first check valve is installed between the water inlet and the detection pipeline; a backflow preventer consisting of two check valves is installed between the air inlet and the detection pipeline.

6. The exhaust valve detection method according to claim 5, characterized in that: A second one-way valve and a third one-way valve are provided between the air inlet and the detection pipeline. The second one-way valve and the third one-way valve are connected to a first drain pipe. A third valve is installed on the first drain pipe, and the third valve controls the opening and closing of the first drain pipe.

7. The exhaust valve detection method according to claim 6, characterized in that: The detection pipeline is connected to the second drain pipe, and the second drain pipe is equipped with a fourth valve, which controls the opening and closing of the second drain pipe; the first drain pipe and the second drain pipe are respectively located at the two ends of the detection pipeline.

8. The exhaust valve detection method according to claim 1, characterized in that: In step S1, the operation of injecting and stopping water injection is completed by controlling the first valve set between the water inlet and the detection pipeline; in step S2, the operation of inputting high-pressure gas and stopping inputting high-pressure gas is completed by controlling the second valve set between the air inlet and the detection pipeline.

9. The exhaust valve detection method according to claim 1, characterized in that: In step S1, in step S3, the pressure is reduced to the initial pressure P1, and it is observed that there is no water leakage when the tested exhaust valve is closed.

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