Gas pressure regulating tank detection device and diffusion pressure detection method

Abstract

The present application relates to the technical fields of gas pressure regulating tank detection, and provides a gas pressure regulating tank detection device and a diffusion pressure detection method, which comprises a detection system, including a main gas supply pipeline and a main gas discharge pipeline; a gas pressure regulator and an inlet pressure transmitter are arranged on the main gas supply pipeline, and the gas pressure regulator is used for adjusting the inlet pressure of the gas pressure regulating tank; an outlet pressure transmitter and a flow regulating valve are arranged on the main gas discharge pipeline; a pressurization detection system comprises a pressurization detection pipeline and a detection pipeline pressure transmitter; the gas inlet end of the pressurization detection pipeline is communicated with the gas source side of the detection system, and the gas outlet end is used for being communicated with the internal pipeline of the measured gas pressure regulating tank, and is used for conveying gas to the measured gas pressure regulating tank to adjust the internal pressure; the detection pipeline pressure transmitter is arranged on the pressurization detection pipeline, and is used for detecting the gas pressure in the pressurization detection pipeline in real time; the technical problem of inaccurate detection of the diffusion pressure of the gas pressure regulating tank in the prior art is solved.

Description

Technical Field

[0001] This invention relates to the field of gas pressure regulating box testing technology, specifically to a gas pressure regulating box testing device and a method for detecting venting pressure. Background Technology

[0002] Gas pressure regulating boxes are key safety devices in urban gas transmission and distribution systems, integrating functions such as pressure regulation, filtration, and safety protection. Their main function is to stably reduce the pressure of upstream medium- and high-pressure gas pipelines to the safe operating pressure required by downstream users, ensuring the safe and stable operation of the gas supply system. Before leaving the factory, gas pressure regulating boxes must undergo performance testing according to the national standard GB27791. This includes testing for outlet pressure error, venting pressure error, shut-off pressure error, closing pressure, rated flow, venting valve reseating pressure and opening / closing pressure difference, and shut-off valve seat sealing. Venting pressure is tested by installing a hose at the venting valve outlet, connecting the hose to water, and observing the continuous bubbles generated in the water to determine the venting pressure.

[0003] In existing technologies, to avoid errors caused by manual judgment of continuous bubbles, there are two factory testing methods for gas pressure regulating boxes. One method involves pressurizing the gas at the inlet of the vent valve and connecting a pressure transmitter to the outlet. When the vent valve is closed, the pressure transmitter does not collect pressure; when the vent valve is open, the pressure transmitter collects pressure and assumes that the vent valve has started releasing gas. However, the drawback of this method is that the movement or deformation of internal parts of the vent valve during pressurization can cause the pressure transmitter to read the pressure, leading to misjudgment.

[0004] The second method involves connecting a flow meter to the outlet of the vent valve. The flow meter pressurizes the gas at the inlet of the vent valve, and once it detects the set flow rate, it determines that the vent valve is open and uses the pressure at the inlet as the vent pressure. The drawback of this method is that the gas at the outlet of the vent valve is usually a mixture of gas and liquid phases, which can easily lead to flow meter detection errors and damage to the flow meter. Summary of the Invention

[0005] To overcome the above-mentioned defects, embodiments of the present invention provide a gas pressure regulating box detection device and a venting pressure detection method, which solves the technical problem of inaccurate venting pressure detection in the prior art.

[0006] According to one aspect, at least one embodiment of the present invention provides a gas pressure regulating box detection device, comprising: The detection system includes a main gas supply pipeline and a main exhaust pipeline, which are respectively connected to the gas pressure regulating box under test. The main gas supply pipeline is used to connect to a gas source to supply gas to the gas pressure regulating box under test. A gas pressure regulator is installed on the main gas supply pipeline to adjust the inlet pressure of the gas pressure regulating box under test. The main exhaust pipeline is used to discharge the gas in the gas pressure regulating box under test. An outlet pressure transmitter and a flow regulating valve are installed on the main exhaust pipeline. The pressurization detection pipeline is used to connect to the gas pressure regulating box under test to deliver gas into the gas pressure regulating box and thereby regulate its internal pressure. The pressurization detection pipeline is equipped with a detection pipeline pressure transmitter for real-time detection of the gas pressure in the pressurization detection pipeline. The controller is electrically connected to the gas pressure regulator and the flow regulating valve, respectively, and is used to control the gas pressure regulator to adjust the inlet pressure of the gas pressure regulating box under test to the preset inlet value, and to control the gas flow through the flow regulating valve. The controller is also electrically connected to the outlet pressure transmitter and the detection pipeline pressure transmitter, and is used to obtain the parameters of the detection pipeline pressure transmitter after the pressure in the pressurized detection pipeline stabilizes and use them as the measured value of the vent pressure of the gas pressure regulating box under test.

[0007] For example, in at least one embodiment of the present invention, a gas pressure regulating box detection device further includes: A flow meter is installed on the pressurization detection pipeline to detect the gas flow rate within the pressurization detection pipeline; A first microflow regulating valve is installed on the pressurization detection pipeline and electrically connected to the controller. After receiving the flow data from the flow meter, the controller outputs a first command. The first microflow regulating valve is used to receive the first command from the controller and adjust the gas flow rate in the pressurization detection pipeline so that the flow rate is stabilized at a preset flow rate that generates continuous bubbles at the outlet of the vent valve.

[0008] For example, in a gas pressure regulating box detection device provided in at least one embodiment of the present invention, the pressurization detection pipeline includes a control pipeline and a connecting pipeline that are interconnected; the control pipeline is used to connect with a gas source, and the connecting pipeline is connected with a pipeline inside the gas pressure regulating box being tested; the flow meter and the first micro-flow regulating valve are both disposed on the control pipeline, and the device further includes: The test exhaust pipe is connected to the control pipe and the connecting pipe via a tee. The control pipe is not simultaneously connected to the connecting pipe, so as to realize the pressure increase and pressure decrease operations of the gas pressure regulating box under test respectively.

[0009] For example, in at least one embodiment of the present invention, a gas pressure regulating box detection device further includes: A second microflow regulating valve is installed on the detection exhaust pipe. The second microflow regulating valve is electrically connected to the controller. After the controller records the release pressure, it outputs a second regulation command. The second microflow regulating valve is used to receive the second regulation command from the controller and adjust the exhaust flow rate of the detection exhaust pipe to control the pressure drop rate inside the gas pressure regulating box under test.

[0010] For example, in at least one embodiment of the present invention, a gas pressure regulating box detection device further includes: The pressure-boosting branch pipe is tested. One end of the pressure-boosting branch pipe is connected to the gas source, and the other end is connected to the inside of the gas pressure regulating box under test. An electric regulator is installed on the pressure-boosting branch pipe. The electric regulator is electrically connected to the controller and is used to adjust the output pressure of the pressure-boosting branch pipe so that the pressure at the outlet of the gas pressure regulating box under test increases at an adjustable rate.

[0011] For example, in at least one embodiment of the present invention, a gas pressure regulating box detection device further includes... A pressurized branch pipe is tested and connected in parallel with the control pipeline. One end of the pressurized branch pipe is connected to the gas source side, and the other end is connected to the connecting pipeline. An electric regulator is installed on the pressurized branch pipe and is electrically connected to the controller. The regulator is used to adjust the output pressure of the pressurized branch pipe so that the pressure at the outlet of the gas pressure regulating box under test increases at an adjustable rate.

[0012] For example, in at least one embodiment of the present invention, a gas pressure regulating box detection device further includes: A pressure reducing valve is installed at the air inlet of the pressurized detection pipeline. The pressure reducing valve is used to adjust the gas pressure in the pressurized detection pipeline to the preset detection value.

[0013] For example, in at least one embodiment of the present invention, a gas pressure regulating box detection device further includes: A position sensor is installed on the shut-off valve inside the gas pressure regulating box and is electrically connected to the controller. It is used to detect the operating state of the shut-off valve, generate a position signal, and feed back the position signal to the controller so that the controller can send a capture command to the detection pipeline pressure transmitter. The detection pipeline pressure transmitter acquires the pressure value and is recorded by the controller as the measured value of the shut-off pressure.

[0014] According to another aspect, at least one embodiment of the present invention also provides a method for detecting the vent pressure of a gas pressure regulating box, which utilizes the aforementioned gas pressure regulating box detection device to detect the vent pressure of the gas pressure regulating box, including: S100, adjust the gas pressure regulating box under test to a static stable state, and set the preset flow rate of the pressure testing pipeline through the controller. The preset flow rate is the same as the flow rate of continuous bubbles generated at the outlet of the gas pressure regulating box's vent valve. S200, the controller controls the first micro-flow regulating valve to work in conjunction with the flow meter, and delivers gas at a constant speed to the outlet of the gas pressure regulating box under test through the pressurization detection pipeline, so that the internal pressure of the gas pressure regulating box slowly increases until the pressure detection of the gas pressure regulating box is completed. S300: After the vent valve starts to release air, the pressure in the pressurization detection line tends to stabilize and no longer rises. After the pressure stabilization time reaches the set value, the controller reads the value of the pressure transmitter in the detection line as the actual value of the vent pressure for this time.

[0015] For example, in a gas pressure regulating box venting pressure detection method provided by at least one embodiment of the present invention, the following preparatory steps are included before step S100: S01, the inlet pressure of the gas pressure regulating box under test is adjusted to the preset inlet value by the gas pressure regulator; S02, the controller controls the flow regulating valve to close, maintaining the system pressure stable for a set time, so that the pressure at the outlet of the gas pressure regulating box under test stabilizes to the working pressure.

[0016] The beneficial effects of this invention are as follows: In this invention, the outlet pressure setting error and closing pressure detection of the gas pressure regulating box are achieved through the main gas supply pipeline and the main exhaust pipeline. The controller controls the gas flow rate in the pressurization detection pipeline, stabilizing the flow rate at a preset value equivalent to the generation of continuous bubbles at the outlet of the vent valve. When the vent valve reaches stable venting (i.e., when continuous bubbles are generated), the venting volume of the vent valve is equal to the gas intake volume of the pressurization detection pipeline, thereby maintaining a balanced pressure within the gas pressure regulating box. This balanced state is sustainable, allowing the controller to determine the state of the vent valve based on the pressure stabilization time. Attached Figure Description

[0017] To more clearly illustrate the technical solutions in the embodiments of the present invention, the accompanying drawings used in the description of the embodiments of the present invention will be briefly introduced below. Obviously, the drawings described below are merely some exemplary embodiments of the present invention. For those skilled in the art, other drawings can be obtained based on the content of the exemplary embodiments of the present invention and these drawings without any creative effort.

[0018] Figure 1 This is a schematic diagram of the present invention; Figure 2 This is a schematic diagram illustrating the test release pressure state of this invention; Figure 3 This is a schematic diagram of the test cut-off pressure state of the present invention; Figure 4 This is a schematic diagram of the basic test state of the present invention; In the diagram: 100, main gas pipeline; 200, gas pressure regulating box; 110, gas pressure regulator; 300, main exhaust pipeline; 310, outlet pressure transmitter; 320, flow regulating valve; 400, pressurization detection pipeline; 210, vent valve; 220, shut-off valve; 410, detection pipeline pressure transmitter; 431, flow meter; 432, first micro-flow regulating valve; 420, pressure reducing valve; 430, control pipeline; 440, connecting pipeline; 450, detection exhaust pipeline; 451, second micro-flow regulating valve; 460, detection pressurization branch pipe; 461, electronic control controller; 500, position sensor. Detailed Implementation

[0019] The present invention will now be described in further detail with reference to the accompanying drawings and embodiments. It should be understood that the specific embodiments described herein are merely illustrative of the invention and not intended to limit it.

[0020] To keep the drawings concise, each drawing only schematically shows the parts relevant to the invention; these do not represent the actual structure of the product. Furthermore, for ease of understanding, in some drawings, only one of components with the same structure or function is schematically shown, or only one is labeled. In this document, "one" not only means "only one," but can also mean "more than one," and "several" includes "two" and "more than two."

[0021] In this document, it should be noted that, unless otherwise explicitly specified and limited, the terms "installation," "connection," and "linking" should be interpreted broadly. For example, they can refer to fixed connections, detachable connections, or integral connections; they can refer to mechanical connections or electrical connections; they can refer to direct connections or indirect connections through an intermediate medium; and they can refer to the internal communication between two components. Those skilled in the art can understand the specific meaning of the above terms in this invention based on the specific circumstances.

[0022] In this invention, unless otherwise explicitly specified and limited, "above" or "below" the second feature can include direct contact between the first and second features, or contact between the first and second features through another feature between them. Furthermore, "above," "over," and "on top" of the second feature includes the first feature directly above or diagonally above the second feature, or simply indicates that the first feature is at a higher horizontal level than the second feature. "Below," "below," and "under" the second feature includes the first feature directly below or diagonally below the second feature, or simply indicates that the first feature is at a lower horizontal level than the second feature.

[0023] In the description of this embodiment, terms such as "upper," "lower," "left," and "right" are based on the orientation or positional relationship shown in the accompanying drawings. They are used only for the convenience of description and simplification of operation, and are not intended to indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation. Therefore, they should not be construed as limitations on the present invention.

[0024] Furthermore, in the description of this application, the terms "first," "second," etc., are used only to distinguish descriptions and should not be construed as indicating or implying relative importance.

[0025] A gas pressure regulating box, also known as a gas pressure regulating cabinet, is installed in a gas system to maintain the incoming gas pressure within a stable and safe range. The gas pressure regulating box contains at least one pipeline, which is equipped with at least, in sequence, an inlet valve, a filter, a pressure regulator, and an outlet valve. A vent valve is also installed on the pipeline, and a shut-off valve is installed on the pressure regulator. The illustrated gas pressure regulating box contains two pipelines, and a vent valve is installed on the merging pipeline of the two pipelines.

[0026] Before leaving the factory, gas pressure regulating boxes need to be tested. If all indicators are within a reasonable error range, they are considered qualified; if they exceed the error range, they are deemed defective. The most basic testing method involves connecting the vent valve outlet to a water tank via a hose, and then continuously injecting gas into the gas pressure regulating box. When the pressure inside the gas pressure regulating box exceeds the vent valve's release pressure, the vent valve opens and releases the gas. During this gas release process, bubbles are generated in the water. The operator observes the pressure transmitter at the point where continuous bubbles are generated and uses it to detect the release pressure. However, this method lacks a clear definition of continuous bubbles, leading to human error in the test results, whether different personnel are testing the same workpiece or the same personnel are testing different workpieces.

[0027] To avoid errors caused by human factors, there are currently two common methods for detecting vent pressure. One method involves installing a pressure transmitter at the outlet of the vent valve, while the other involves installing a flow meter. The first method determines the vent valve's open state by checking the pressure transmitter for a reading, while the second method determines it by measuring the flow rate at the vent valve outlet reaching a set flow rate. The first method is prone to inaccurate results due to factors such as movement or deformation of internal parts of the vent valve (e.g., diaphragm deformation upon addition). The second method, while using flow rate detection, involves releasing pressure from the gas pressure regulating tank when the vent valve is open. The gas emitted from the vent valve exists in both liquid and gaseous phases, which not only affect the flow meter's detection accuracy but can also damage the flow meter.

[0028] Secondly, when using the second method for venting pressure detection, the discharge rate at the outlet of the venting valve increases as the pressure inside the gas pressure regulating box increases, making it difficult for the flow meter to detect a stable value; it can only capture instantaneous flow. This makes it easy for the external environment to affect the detection results. For example, when there is airflow from outside, the controller will receive an incorrect signal from the flow meter, leading to deviations in the test results.

[0029] like Figures 1-4 The diagram illustrates a gas pressure regulating box detection device according to an embodiment of the present invention, comprising a detection system, a pressurization detection system, and a controller. The detection system includes a main gas supply pipeline 100 and a main exhaust pipeline 300. The main gas supply pipeline 100 is connected to the inlet of the gas pressure regulating box 200 under test via a hose, and is sequentially equipped with an inlet electric valve, a filter, a gas pressure regulator 110, an inlet pressure transmitter, and an inlet flow meter. The gas pressure regulator 110 is used to regulate the inlet pressure of the gas pressure regulating box 200 under test. The main exhaust pipeline 300 is connected to the exhaust port of the gas pressure regulating box 200 under test via a hose, and is equipped with an outlet pressure transmitter 310 and a flow regulating valve 320. The outlet pressure transmitter 310 is used to detect the gas pressure within the main exhaust pipeline 300, and the flow regulating valve 320 is used to regulate the exhaust flow rate of the main exhaust pipeline 300.

[0030] The number of outlet pressure transmitters 310 can be set to multiple, each used to detect the gas pressure in different pressure ranges.

[0031] The pressurization detection system includes a pressurization detection pipeline 400 and a pressure transmitter 410. The inlet of the pressurization detection pipeline 400 is connected to the gas source side of the detection system, and the outlet is connected to the internal pipeline of the gas pressure regulating box 200 to be tested via a hose. Gas from the gas source of the detection system can be introduced into the gas pressure regulating box 200 through the pressurization detection pipeline 400, thereby continuously increasing the internal pressure of the gas pressure regulating box 200. The pressure transmitter 410 is installed on the pressurization detection pipeline 400 and is used to detect the gas pressure within the pressurization detection pipeline 400 in real time. Multiple pressure transmitters 410 can also be configured to detect gas pressures in different pressure ranges.

[0032] The controller is electrically connected to all electrically controlled valves, pressure transmitters, and flow detection elements in the detection system and pressurization detection system. It receives data signals, determines the status of the gas pressure regulating box 200 based on these signals, and records the corresponding detection values. Optionally, the controller can be a programmable logic controller (PLC), a microcontroller, or an industrial computer; optionally, the controller can have a built-in data storage module and a wireless transmission module to enable local storage and remote uploading of detection data.

[0033] like Figure 2As shown, to achieve accurate detection of venting pressure, the pressurization detection pipeline 400 includes a control pipeline 430 and a connecting pipeline 440 that are interconnected. The inlet end of the control pipeline 430 is connected to the gas source side of the detection system, and the outlet end of the connecting pipeline 440 is connected to the outlet end of the gas pressure regulating box 200 under test via a flexible hose. A flow meter 431 and a first micro-flow regulating valve 432 are sequentially installed on the control pipeline 430. The flow meter 431 is used to detect the gas flow rate in the control pipeline 430, and the first micro-flow regulating valve 432 is electrically connected to the controller to regulate the gas flow rate in the control pipeline 430, stabilizing the flow rate at a preset value. This preset flow rate is the same as the flow rate at which continuous bubbles are generated at the outlet of the venting valve 210. The micro-flow regulating valve is a small-sized flow regulating valve with an adjustment range of 20~50ml / min.

[0034] Working principle: When the controller receives the detection and release pressure signal, it controls the gas source to introduce gas into the gas pressure regulating box through the pressurization detection pipeline 400. At this time, the controller continuously receives the detection data of the flow meter 431 and sends the first adjustment command to the first micro-flow regulating valve 432 through the received data, so that it adjusts the flow rate in the pressurization detection pipeline 400 until the flow rate in the pressurization detection pipeline 400 is the same as the preset flow rate.

[0035] The flow rate of continuous bubbles generated at the outlet of the vent valve 210 is determined by manual testing of the same batch of vent valves 210 before the actual test. Once it is determined that the gas discharged from the vent valve 210 generates continuous bubbles in the water, the current flow rate of the vent valve 210 is measured by a flow meter and manually recorded as the preset flow rate. Using this measured flow rate as the preset flow rate is equivalent to applying a standard to the vent pressure detection of the vent valve 210. Only when the flow rate discharged from the vent valve 210 is the same as the preset flow rate is the pressure inside the gas pressure regulating box 200 determined to be the vent pressure. The first micro-flow regulating valve 432 and the flow meter 431 are both located in the pressure detection pipeline 400, ensuring that the internal gas does not instantly depressurize and form both gas and liquid phases.

[0036] When performing venting pressure testing, a preset flow rate is first set via the controller. The controller then adjusts the first micro-flow regulating valve 432 based on the numerical feedback from the flow meter 431, maintaining the same gas flow rate in the pressurization detection pipeline 400 as the preset flow rate. The gas is continuously supplied to the gas pressure regulating tank 200 through the pressurization detection pipeline 400 at the preset flow rate, causing the pressure inside the gas pressure regulating tank 200 to continuously increase. Simultaneously, the pressure in the pressurization detection pipeline 400 also continuously increases. When the pressure in the gas pressure regulating tank 200 reaches the venting pressure, the venting valve 210 opens and discharges gas. When the gas flow rate discharged by the venting valve 210 is the same as the preset flow rate, i.e., the gas discharged by the venting valve 210 generates continuous bubbles in the water, the gas flow rate into the gas pressure regulating tank 200 is equal to the gas flow rate discharged by the venting valve 210. At this point, since the flow rate continuously supplied to the gas pressure regulating tank 200 through the pressurization detection pipeline 400 is also the preset flow rate, the gas flow rate inside the gas pressure regulating tank 200 reaches a state where the gas inflow is equal to the gas outflow from the venting valve 210, and the pressure in both the gas pressure regulating tank 200 and the pressurization detection pipeline 400 no longer increases.

[0037] The controller determines that the gas pressure regulating box 200 has reached the release pressure by reading the constant pressure of the detection pipeline transmitter 410 over a period of time. The value of the detection pipeline transmitter 410 recorded at this time is the release pressure.

[0038] To enable multiple pressure release tests on the same gas pressure regulating box, a test exhaust pipe 450 is further included. The test exhaust pipe 450 is connected to the control pipe 430 and the connecting pipe 440 via a tee interface. The test exhaust pipe 450 and the control pipe 430 are connected to the connecting pipe 440 at different times via a solenoid valve, so as to separately realize the pressure increase and pressure release operations at the outlet end of the gas pressure regulating box 200 under test.

[0039] Optionally, the detection exhaust pipe 450, control pipe 430, and connecting pipe 440 can be connected by a three-way solenoid valve, which is electrically connected to the controller. Similarly, the three-way solenoid valve can be replaced by two independent normally closed solenoid valves, which respectively control the on / off state of the control pipe 430 and the detection exhaust pipe 450.

[0040] After the controller records a release pressure, it closes the control line 430 and opens the detection exhaust line 450, allowing gas in the gas pressure regulating tank 200 to be discharged through the detection exhaust line 450, thereby reducing the gas pressure in the gas pressure regulating tank 200 until it drops to the point where the release valve 210 closes. After the release valve 210 closes, the controller controls the detection exhaust line 450 to close and the control line 430 to open, and then charges the gas pressure regulating tank 200 again at a set flow rate until the controller records the release pressure.

[0041] The controller compares the measured vent pressures multiple times with the set vent pressure. If the deviation between the measured vent pressures and the set pressures is within a reasonable range, it is marked as qualified. Finally, the average value of each measured vent pressure is calculated, and the accuracy level of the vent valve's set pressure is evaluated based on the comparison of the average value with the total measured vent pressures.

[0042] During the exhaust process of the exhaust pipe 450, in order to avoid the pressure in the gas pressure regulating box 200 dropping too quickly and requiring refilling of gas for the next release pressure test, a second micro-flow regulating valve 451 is further installed on the exhaust pipe 450. The second micro-flow regulating valve 451 is electrically connected to the controller and is used to adjust the exhaust flow of the exhaust pipe 450 to control the pressure drop rate inside the gas pressure regulating box 200 under test, so as to ensure the stability of the gas pressure in the gas pressure regulating box 200 and the control system.

[0043] Working principle: After the controller records the release pressure data once, it closes the control line 430, opens the detection and exhaust line 450, and sends the second adjustment command to the second micro-flow regulating valve 451. The second adjustment command is adjusted in real time by collecting data from the detection line pressure transmitter 410.

[0044] Furthermore, the pressurization detection line 400 also includes a detection pressurization branch line 460 connected in parallel with the control line 430. The inlet end of the detection pressurization branch line 460 is connected to the gas source side of the detection system, and the outlet end is connected to the connecting line 440. An electric regulator 461 is installed on the detection pressurization branch line 460. The electric regulator 461 is electrically connected to the controller and is used to adjust the output pressure of the detection pressurization branch line 460 so that the pressure at the outlet end of the gas pressure regulating box 200 under test increases at an adjustable rate. Optionally, the electric regulator 461 can be replaced with an electric proportional pressure reducing valve.

[0045] When detecting the shut-off pressure of the gas pressure regulating box 200, since the shut-off pressure is greater than the venting pressure, the first micro-flow regulating valve 432 and the flow meter 431 can no longer make the pressure inside the gas pressure regulating box 200 exceed the venting pressure. At this time, the control pipeline 430 containing the first micro-flow regulating valve 432 and the flow meter is closed, allowing the gas from the gas source to enter the gas pressure regulating box 200 through the detection pressurization branch pipe 460 and the connecting pipeline 440. By controlling the gas flow rate through the electric controller 461 to enter the gas pressure regulating box 200 at a rate greater than the exhaust flow rate of the venting valve 210, the pressure inside the gas pressure regulating box 200 can be continuously increased. Secondly, since the discharge flow rate of the venting valve 210 will continuously increase with the increase of the pressure inside the gas pressure regulating box 200, the flow rate of the electric controller 461 needs to be adjusted accordingly to adapt to the increase of the discharge flow rate of the venting valve 210.

[0046] The controller can determine the opening degree of the electrically controlled pilot valve 461 by collecting pressure data from the pressure transmitter 410 in the detection pipeline. For example, when the pressure of the pressure transmitter 410 in the detection pipeline remains stable, the opening degree of the electrically controlled pilot valve 461 remains unchanged. When the pressure rise rate of the pressure transmitter 410 in the detection pipeline slows down or increases, the opening degree of the electrically controlled pilot valve 461 is controlled to decrease or increase accordingly.

[0047] The electronic controller 461 is a combination of a servo motor and a controller. The controller controls the controller by controlling the servo motor. Since both the controller and the servo motor are existing technologies, they will not be described in detail here.

[0048] Furthermore, a pressure reducing valve 420 is also provided at the air inlet end of the pressure testing pipeline 400. The pressure reducing valve 420 is used to adjust the input gas source pressure to a preset stable value. In this embodiment, the pressure reducing valve 420 can stably adjust the gas pressure input from the gas source to a set pressure, and the set pressure is higher than the cut-off pressure setting value and the venting pressure setting value of the gas pressure regulating box 200 under test.

[0049] Furthermore, to enable the controller to detect the shut-off action of the shut-off valve 220, a position sensor 500 is also included. The position sensor 500 is installed on the shut-off valve 220 inside the gas pressure regulating box 200 and is electrically connected to the controller. It is used to detect the operating state of the shut-off valve 220 and feed back a trigger signal to the controller, enabling the controller to capture the moment of shut-off and record the pressure value of the detection pipeline pressure transmitter 410 in real time based on the signal from the position sensor 500 as the measured value of the shut-off pressure. Optionally, the position sensor 500 can be a proximity switch, a Hall sensor, or a limit switch.

[0050] like Figures 1-4 As shown, the working principle of the gas pressure regulating box detection device is as follows: 1. Preparations before testing like Figure 1 As shown, a connecting hose is used to connect the inlet of the gas pressure regulating box 200 under test to the main gas supply pipeline 100, and the outlet to the main exhaust pipeline 300; the connecting pipe 440 is connected to the internal pipeline of the gas pressure regulating box 200 under test; the position sensor 500 is installed on the shut-off valve 220; the inlet and outlet valves of the test circuit of the gas pressure regulating box 200 under test are opened. The operator enters the test parameters into the controller: inlet pressure range, outlet pressure setpoint, shut-off pressure setpoint, venting pressure setpoint, rated flow rate, etc.

[0051] 2. Detection of outlet pressure setting error The controller instructs to open the valve on the main gas pipeline 100, and uses the gas pressure regulator 110 to stabilize the inlet pressure of the tested gas pressure regulating box 200 at the lower limit of the inlet pressure range. Adjust the flow regulating valve 320 to stabilize the pipeline flow at 10% of the rated flow (taking a rated flow of 1000m³ / h as an example, the controlled flow is 100m³ / h). The controller reads the measured pressure value from the outlet pressure transmitter 310, compares it with the set value to calculate the error, and the test is qualified if the error does not exceed ±5%.

[0052] 3. Lockup pressure detection After the outlet pressure detection is completed, the controller uses the gas pressure regulator 110 to raise the inlet pressure to the upper limit of the inlet pressure range, controls the flow regulating valve 320 to close slowly, maintains a state where the pipeline has gas inlet but no gas outlet, and stands still for a period of time (e.g., 60S). After the controller reads the pressure value of the outlet pressure transmitter 310 once, it stands still for another period of time (e.g., 30S, 45S, etc.), the controller reads the pressure value of the outlet pressure transmitter 310 for the second time, and when the two values collected by the controller are consistent, they are taken as the measured value of the lockup pressure, and compared with the standard limit to judge the qualification.

[0053] 4. Relief pressure detection Make the gas pressure in the gas pressure regulating box 200 at a stable value, and the controller controls the pressure reducing valve 420 to stabilize the inlet pressure of the pressurized detection pipeline 400 within a range greater than the set value of the relief pressure. Open the three-way solenoid valve to connect the control pipeline 430 with the communication pipeline 440, and close the detection exhaust pipeline 450. The controller controls the first micro-flow regulating valve 432 to cooperate with the flow meter 431, so that the flow in the control pipeline 430 is stabilized at a preset flow (e.g., 30mL / min is the detection flow when the relief valve 210 generates continuous bubbles after traditional detection, that is, the set flow, to avoid artificial inconsistency in detection), and the pressure is increased at a constant speed to the outlet end of the tested gas pressure regulating box 200. After the relief valve 210 starts to exhaust, the pressure in the pressurized detection pipeline 400 tends to be stable. After the pressure is stable for 15 seconds, the controller reads the value of the detection pipeline pressure transmitter 410 as the first measured value of the relief pressure.

[0054] Close the control pipeline 430, open the detection exhaust pipeline 450, and control the exhaust flow through the second micro-flow regulating valve 451, so that the system slowly releases pressure to the initial static pressure (which can be set by the controller according to detection requirements). Repeat the above pressure rise detection process to complete a total of three relief pressure tests. The controller respectively compares the three measured values with the set relief pressure value of the relief valve and calculates the error, and the test is qualified if all errors do not exceed ±5%.

[0055] 5. Shutoff pressure detection After the relief pressure detection is completed, the controller switches the three-way solenoid valve to communicate the detection pressurization branch pipe 460 with the communication pipeline 440. The output pressure is adjusted by the electric regulator pilot 461, so that the pressure in the tested gas pressure regulating box 200 continues to rise. When the shutoff valve 220 acts, the position sensor 500 feeds back a trigger signal to the controller, and the controller captures and records the value of the detection pipeline pressure transmitter 410 at this time as the first measured shutoff pressure value.

[0056] To simulate the actual scenario, the shutoff valve 220 can be manually reset to the state to be detected, or a motor arranged at the detection site can drive an electric shifting rod to restore the shutoff valve 220 to the state to be tested, and the above process is repeated to complete three shutoff pressure detections. The controller compares the three measured values with the set value respectively and calculates errors, and it is qualified if all errors do not exceed ±5%.

[0057] A filter and a safety valve are added on the main gas transmission pipeline 100, so as to prevent impurities in the gas source from entering the detection system, and ensure the overpressure safety of the system at the same time.

[0058] In actual use, a human-computer interaction interface can be added, through which an operator can input basic data, and select a detection item to be performed.

[0059] It should be noted that the above embodiments are only used to illustrate the technical solution of the present invention rather than limit it. Although the present invention is described in detail with reference to the preferred embodiments, those of ordinary skill in the art should understand that modifications or equivalent substitutions can be made to the technical solution of the present invention without departing from the spirit and scope of the technical solution of the present invention, which shall all be encompassed in the scope of the claims of the present invention.

Claims

1. A gas pressure regulating box detection device, characterized in that, include: The detection system includes a main gas supply pipeline (100) and a main exhaust pipeline (300) for connecting to the gas pressure regulating box (200) under test. The main gas supply pipeline (100) is used to connect to a gas source to supply gas to the gas pressure regulating box (200) under test. A gas pressure regulator (110) is provided on the main gas supply pipeline (100) for adjusting the inlet pressure of the gas pressure regulating box (200) under test. The main exhaust pipeline (300) is used to discharge the gas in the gas pressure regulating box (200) under test. An outlet pressure transmitter (310) and a flow regulating valve (320) are provided on the main exhaust pipeline (300). A pressure detection pipeline (400) is used to connect to the gas pressure regulating box (200) to deliver gas into the gas pressure regulating box (200) and thereby regulate its internal pressure. The pressure detection pipeline (400) is equipped with a detection pipeline pressure transmitter (410) for real-time detection of the gas pressure in the pressure detection pipeline (400). The controller is electrically connected to the gas pressure regulator (110) and the flow regulating valve (320) respectively. It is used to control the gas pressure regulator (110) to adjust the inlet pressure of the gas pressure regulating box (200) to the preset inlet value and to control the gas flow through the flow regulating valve (320). The controller is also electrically connected to the outlet pressure transmitter (310) and the detection pipeline pressure transmitter (410). It is used to obtain the parameters of the detection pipeline pressure transmitter (410) after the pressure in the pressurized detection pipeline (400) stabilizes and use them as the measured value of the vent pressure of the gas pressure regulating box (200). A flow meter (431) is installed on the pressurization detection pipeline (400) to detect the gas flow rate in the pressurization detection pipeline (400); The first microflow regulating valve (432) is installed on the pressurization detection pipeline (400) and electrically connected to the controller. After receiving the flow data from the flow meter (431), the controller outputs a first command. The first microflow regulating valve (432) is used to receive the first command from the controller and adjust the gas flow rate in the pressurization detection pipeline (400) so that the flow rate is stabilized at the preset flow rate of the continuous bubble generation at the outlet of the vent valve.

2. The gas pressure regulating box detection device according to claim 1, characterized in that, The pressurization detection pipeline (400) includes a control pipeline (430) and a connecting pipeline (440) that are interconnected; the control pipeline (430) is used to connect to the gas source, and the connecting pipeline (440) is connected to the pipeline inside the gas pressure regulating box (200) being tested; the flow meter (431) and the first micro-flow regulating valve (432) are both installed on the control pipeline (430), and the pipeline also includes: The test exhaust pipe (450) is connected to the control pipe (430) and the connecting pipe (440) in a tee. The control pipe (430) and the test exhaust pipe (450) are not connected to the connecting pipe (440) at the same time, so as to realize the pressure increase and pressure decrease operations of the gas pressure regulating box (200) under test respectively.

3. The gas pressure regulating box detection device according to claim 2, characterized in that, Also includes: The second microflow regulating valve (451) is installed on the detection exhaust pipe (450). The second microflow regulating valve (451) is electrically connected to the controller. After the controller records the release pressure, it outputs a second regulation command. The second microflow regulating valve (451) is used to receive the second regulation command from the controller and adjust the exhaust flow of the detection exhaust pipe (450) to control the pressure drop rate inside the gas pressure regulating box (200) under test.

4. The gas pressure regulating box detection device according to claim 1, characterized in that, Also includes: A pressurized branch pipe (460) is tested. One end of the pressurized branch pipe (460) is connected to the gas source, and the other end is connected to the inside of the gas pressure regulating box (200) under test. An electric regulator (461) is installed on the pressurized branch pipe (460). The electric regulator (461) is electrically connected to the controller and is used to adjust the output pressure of the pressurized branch pipe (460) so that the pressure at the outlet of the gas pressure regulating box (200) under test increases at an adjustable rate.

5. A gas pressure regulating box detection device according to claim 2, characterized in that, Also includes: A pressurized branch pipe (460) is tested. The pressurized branch pipe (460) is connected in parallel with the control pipeline (430). One end of the pressurized branch pipe (460) is connected to the gas source side, and the other end is connected to the connecting pipeline (440). An electric regulator (461) is installed on the pressurized branch pipe (460). The electric regulator (461) is electrically connected to the controller and is used to adjust the output pressure of the pressurized branch pipe (460) so that the pressure at the outlet of the gas pressure regulating box (200) under test rises at an adjustable rate.

6. A gas pressure regulating box detection device according to any one of claims 1 to 5, characterized in that, Also includes: A pressure reducing valve (420) is installed at the inlet end of the pressurized detection pipeline (400). The pressure reducing valve (420) is used to adjust the gas pressure in the pressurized detection pipeline (400) to the preset detection value.

7. A gas pressure regulating box detection device according to claim 1, characterized in that, Also includes: A position sensor (500) is installed on the shut-off valve (220) inside the gas pressure regulating box (200) and is electrically connected to the controller. It is used to detect the operating state of the shut-off valve (220), generate a position signal, and feed back the position signal to the controller so that the controller can send a capture command to the detection pipeline pressure transmitter (410). The detection pipeline pressure transmitter (410) acquires the pressure value and is recorded by the controller as the actual value of the shut-off pressure.

8. A method for detecting the vent pressure of a gas pressure regulating box, comprising using the gas pressure regulating box detection device according to any one of claims 1 to 7 to detect the vent pressure of a gas pressure regulating box (200), characterized in that, include: S100, the gas pressure regulating box (200) under test is adjusted to a static stable state, and the preset flow rate of the pressure testing pipeline (400) is set by the controller. The preset flow rate is the same as the flow rate of continuous bubbles generated at the outlet of the vent valve of the gas pressure regulating box (200). S200, the controller controls the first micro-flow regulating valve (432) to work in conjunction with the flow meter (431) to uniformly deliver gas to the outlet end of the gas pressure regulating box (200) under test through the pressure detection pipeline (400), so that the internal pressure of the gas pressure regulating box (200) slowly increases until the pressure detection of the gas pressure regulating box (200) is completed; S300, after the vent valve (210) starts to vent, the pressure in the pressure detection pipeline (400) tends to stabilize and no longer rises. After the pressure stabilization time reaches the set value, the controller reads the value of the pressure transmitter (410) in the detection pipeline as the actual value of the vent pressure.

9. The method for detecting the vent pressure of a gas pressure regulating box according to claim 8, characterized in that, Before proceeding to step S100, the following prerequisite steps are also included: S01, the inlet pressure of the gas pressure regulating box (200) to be tested is adjusted to the preset inlet value by the gas pressure regulator (110); S02, the controller controls the flow regulating valve (320) to close, maintain the system pressure for a set time, and stabilize the outlet pressure of the gas pressure regulating box (200) to the working pressure.

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