A gas-liquid flowmeter indicating value error and pressure influence test device

Abstract

The present application relates to flow test technical field, disclose a kind of gas-liquid flowmeter indicating value error and pressure influence test device, when first valve is opened, second valve is opened, the volume of chamber in metering cylinder near first medium port is compressed, the medium in this chamber can overflow to first branch pipe through first medium port, first branch pipe and third branch pipe are mutually conducted, medium flows into medium pressure stabilizer through third branch pipe, second branch pipe and third branch pipe are mutually conducted, the medium of medium pressure stabilizer sequentially flows to the second medium port of another chamber in metering cylinder through second branch pipe, the volume of this chamber expands, the connecting port of medium pressure stabilizer and third branch pipe are mutually conducted, the medium of entire pipeline is in closed state, the pressure fluctuation of medium is smaller, first to be tested instrument is arranged between first branch pipe and third branch pipe, when medium flows from first branch pipe to third branch pipe, to be tested instrument can measure the medium flow of flowing through own equipment.

Description

Technical Field

[0001] This invention relates to a test device for the error of the reading of a gas-liquid flow meter and the influence of pressure, belonging to the field of flow measurement technology. Background Technology

[0002] Gas-liquid flow meters, such as water meters and gas meters, are tested before leaving the factory according to technical requirements, stipulating that the reading error of the water meter should be less than or equal to the maximum working pressure. Currently, most testing devices and methods used domestically and internationally employ a water pump to draw flow from a storage tank, converting kinetic energy to achieve the pump's maximum working pressure. The clean water flows through the tested instrument and back to the storage tank. The inlet and outlet valves of the instrument are adjusted, and when the flow rate and pressure meet the test requirements, the water flow is switched to a weighing container. Once the predetermined water volume in the weighing container is reached, the water supply is stopped, and the reading error and pressure influence characteristics are obtained by comparing the water volume in the instrument and the container. Finally, the bottom valve of the weighing container is opened to allow the water to flow back to the storage tank, ending the single test. This type of testing device exhibits significant pressure fluctuations throughout the test pipeline, resulting in a large testing error. Therefore, it is necessary to address the shortcomings of traditional testing devices, which suffer from large testing errors due to unstable flow rates, and propose a testing device for the reading error and pressure influence of gas-liquid flow meters. Summary of the Invention

[0003] This invention provides a test device for the error of gas-liquid flow meter readings and the influence of pressure, which can improve the working condition of large pressure fluctuations in the test pipeline and solve the problem of large test errors.

[0004] This invention provides a testing device for the error of a gas-liquid flow meter reading and the influence of pressure, comprising: The metering cylinder is provided with a first medium port and a second medium port, the first medium port being located at one end of the metering cylinder and the second medium port being located at the other end of the metering cylinder; The air conduit includes a first branch pipe, a second branch pipe, and a third branch pipe. The first branch pipe is connected to a first valve, and the third branch pipe is connected to a second valve. The first medium port is connected to the first branch pipe, the second medium port is connected to the second branch pipe, the first branch pipe is connected to the third branch pipe, and the second branch pipe is connected to the third branch pipe. The first instrument to be tested is disposed between the first branch pipe and the third branch pipe. The medium pressure stabilizing tank is provided with a connection port, which is located near the bottom of the medium pressure stabilizing tank and is connected to the third branch pipe; The piston body includes a piston disc, a first sliding rod, and a second sliding rod. The first sliding rod is fixed to one side wall of the piston disc, and the second sliding rod is fixed to the other side wall of the piston disc. The piston disc is disposed in the inner cavity of the metering cylinder, and the side wall of the piston disc abuts against the inner cavity side wall of the metering cylinder. The first sliding rod is disposed near the first medium port, and the second sliding rod is disposed near the second medium port. The metering cylinder is provided with a first guide hole and a second guide hole. The first sliding rod is disposed inside the first guide hole, and the second sliding rod is disposed inside the second guide hole. The power mechanism includes a motor and a lead screw assembly. The power shaft of the motor is fixedly connected to one end of the lead screw assembly. The second sliding rod is provided with an internal threaded hole. The lead screw nut of the lead screw assembly is threadedly connected to the internal threaded hole of the second sliding rod. An electronic controller is positioned close to the first sliding rod, and the central axis of the electronic controller coincides with the central axis of the first sliding rod.

[0005] This invention proposes a test device for the error of the reading of a gas-liquid flow meter and the influence of pressure. It is a test device with a closed loop structure. The piston body includes a piston disc, a first sliding rod and a second sliding rod. The piston disc isolates the inner cavity of the metering cylinder into two chambers, left and right. The change of the medium volume on the left and right sides of the inner cavity of the metering cylinder is achieved by the movement of the piston body in the metering cylinder.

[0006] When the first valve and the second valve open, the volume of the chamber near the first medium port in the metering cylinder is compressed. The medium in this chamber overflows through the first medium port to the first branch pipe. The first branch pipe and the third branch pipe are interconnected, and the medium flows into the medium pressure stabilizing tank through the third branch pipe. The second branch pipe and the third branch pipe are interconnected, and the medium in the medium pressure stabilizing tank flows sequentially through the second branch pipe to the second medium port of another chamber in the metering cylinder. The volume in this chamber expands, and the connection port of the medium pressure stabilizing tank is interconnected with the third branch pipe. The medium in the entire pipeline is in a closed state, and the pressure fluctuation of the medium is small. The first instrument to be tested is set between the first branch pipe and the third branch pipe. When the medium flows from the first branch pipe through the third branch pipe, the instrument to be tested can measure the flow rate of the medium flowing through its own equipment.

[0007] The electronic controller can calculate the medium flow rate, i.e., the standard piston flow rate, based on the displacement of the first sliding rod and the vertical axial cross-sectional area of ​​the metering cylinder. By comparing the standard piston flow rate with the medium flow rate measured by the first instrument under test, the error of the gas-liquid flow meter reading and the pressure influence characteristics can be obtained. The motor of the power mechanism drives the lead screw assembly to rotate forward. When the lead screw assembly rotates forward, it drives the first sliding rod, piston disc, and second sliding rod to translate towards the first medium port, thereby causing the medium to flow from the first branch pipe through the third branch pipe. This measures the forward reading of the gas-liquid flow meter. The motor of the power mechanism drives the lead screw assembly to rotate in reverse. When the lead screw assembly rotates in reverse, it can move the piston towards the second medium port, thereby causing the medium to flow from the third branch pipe through the first branch pipe. The pressure in the medium pressure tank is pre-charged before the test. During the test, there is no kinetic energy conversion, the medium pressure fluctuation is low, the noise is low, the detection can be automated, and the test accuracy is high. Attached Figure Description

[0008] Figure 1 This is a schematic diagram of a test device for testing the error of a gas-liquid flow meter reading and the influence of pressure in one embodiment of the present invention; Figure 2 This is a schematic diagram of the horizontal metering cylinder, the air pipe, the piston body, and the power mechanism of a test device for testing the error of a gas-liquid flow meter reading and the influence of pressure in an embodiment of the present invention. Figure 3 This is a schematic diagram of the vertical metering cylinder, the air pipe, the piston body, and the power mechanism of a gas-liquid flow meter reading error and pressure influence test device according to an embodiment of the present invention. Figure 4 This is a schematic diagram of the medium pressure stabilizing tank structure of a test device for testing the error of a gas-liquid flow meter reading and the influence of pressure in one embodiment of the present invention; Figure 5 This is a schematic diagram of the electronic controller, piston disc, and first sliding rod of a test device for testing the error of a gas-liquid flow meter reading and the influence of pressure in an embodiment of the present invention; Figure label: 100 - Metering cylinder; 110 - First medium port; 120 - Second medium port; 130 - Third medium port; 140 - Fourth medium port; 150 - First guide hole; 160 - Second guide hole; 200 - Vent pipe; 210 - First branch pipe; 220 - Second branch pipe; 230 - Third branch pipe; 240 - Fourth branch pipe; 250 - Fifth branch pipe; 261 - First valve; 262 - Second valve; 263 - Third valve; 264 - Fourth valve; 300 - Medium pressure stabilizing tank; 310 - Connection port; 320 - Air inlet valve; 330 - Water inlet valve; 340 - Water outlet valve; 350 - Start valve; 400 - Piston body; 410 - Piston disc; 420 - First sliding rod; 430 - Second sliding rod; 440 - Internal threaded hole; 500 - Power mechanism; 510 - Motor; 520 - Lead screw assembly; 600 - Electrical controller; 610 - Processing terminal; 620 - Grating ruler; 630 - Light control beacon. Detailed Implementation

[0009] To make the objectives, technical solutions, and advantages of the present invention clearer, the technical solutions of the present invention will be described in detail below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of the present invention, and not all embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of the present invention.

[0010] like Figure 1 As shown, the present invention provides a test device for the error of the reading value of a gas-liquid flow meter and the influence of pressure, which includes a metering cylinder 100, a gas pipe 200, a medium pressure stabilizing tank 300, a piston body 400, a power mechanism 500, and an electronic controller 600.

[0011] The metering cylinder 100 is provided with a first medium port 110 and a second medium port 120. The first medium port 110 is located at one end of the metering cylinder 100, and the second medium port 120 is located at the other end of the metering cylinder 100.

[0012] The air conduit 200 includes a first branch pipe 210, a second branch pipe 220, and a third branch pipe 230. The first branch pipe 210 is connected to a first valve 261, and the third branch pipe 230 is connected to a second valve 262. The first medium port 110 is connected to the first branch pipe 210, the second medium port 120 is connected to the second branch pipe 220, the first branch pipe 210 is connected to the third branch pipe 230, and the second branch pipe 220 is connected to the third branch pipe 230. The first instrument to be tested is disposed between the first branch pipe 210 and the third branch pipe 230.

[0013] The medium pressure stabilizing tank 300 is provided with a connection port 310, which is located near the bottom of the medium pressure stabilizing tank 300, and the connection port 310 is connected to the third branch pipe 230.

[0014] The piston body 400 includes a piston disc 410, a first sliding rod 420, and a second sliding rod 430. The first sliding rod 420 is fixed to one side wall of the piston disc 410, and the second sliding rod 430 is fixed to the other side wall of the piston disc 410. The piston disc 410 is disposed in the inner cavity of the metering cylinder 100, and the side wall of the piston disc 410 abuts against the inner cavity side wall of the metering cylinder 100. The first sliding rod 420 is disposed near the first medium port 110, and the second sliding rod 430 is disposed near the second medium port 120. The metering cylinder 100 is provided with a first guide hole 150 and a second guide hole 160. The first sliding rod 420 is disposed inside the first guide hole 150, and the second sliding rod 430 is disposed inside the second guide hole 160.

[0015] The power mechanism 500 includes a motor 510 and a lead screw assembly 520. The power shaft of the motor 510 is fixedly connected to one end of the lead screw assembly 520. The second sliding rod 430 is provided with an internal threaded hole 440. The lead screw nut of the lead screw assembly 520 is threadedly connected to the internal threaded hole 440 of the second sliding rod 430.

[0016] The electronic controller 600 is positioned close to the first sliding rod 420, and the central axis of the electronic controller 600 coincides with the central axis of the first sliding rod 420.

[0017] Specifically, Figure 1 M1 is the first instrument to be tested.

[0018] like Figure 2 and Figure 3 As shown, the metering cylinder 100 is a cylindrical structure, and the cross-section perpendicular to the central axis of the metering cylinder 100 is a circular surface. The two ends of the metering cylinder 100 are circular walls. The central axis of the metering cylinder 100 can be perpendicular to the ground, i.e., a vertical gas-liquid flow meter reading error and pressure influence test device, or it can be parallel to the ground, i.e., a horizontal gas-liquid flow meter reading error and pressure influence test device.

[0019] Simple, Figure 2 It is a test device for the error of the reading of a horizontal gas-liquid flow meter and the influence of pressure.

[0020] Figure 3 This is a test device for the error of the indicated value and the influence of pressure on the vertical gas-liquid flow meter. The test device for the error of the indicated value and the influence of pressure on the vertical gas-liquid flow meter can omit the first guide hole 150 and the first sliding rod 420, and utilizes the structure of the piston disc 410 itself attached to the inner wall of the metering cylinder 100 to perform bidirectional movement. It is worth mentioning that Figure 3 The central electronic controller 600 is positioned near the second sliding rod 430.

[0021] like Figure 2 The piston disc 410 inside the metering cylinder 100 can achieve unidirectional metering during the guidance of the first sliding rod 420 and the second sliding rod 430.

[0022] When the piston disc 410 moves unidirectionally toward the first medium port 110 of the metering cylinder 100, the volume of the metering cylinder 100 on the first medium port 110 side decreases, and the medium in the metering cylinder 100 on the first medium port 110 side flows to the first branch pipe 210. The medium passes through the gas-liquid flow rate to be tested and flows to the third branch pipe 230. The second branch pipe 220 and the third branch pipe 230 are interconnected, and the medium flows through the third branch pipe 230 into the metering cylinder 100 on the second medium port 120 side. The volume of the metering cylinder 100 on the second medium port 120 side is in an expanded state, so the medium pressure fluctuation in the entire pipeline is small.

[0023] When the piston disc 410 moves unidirectionally toward the second medium port 120 of the metering cylinder 100, the volume of the metering cylinder 100 on the second medium port 120 side decreases, and the medium in the metering cylinder 100 on the second medium port 120 side flows to the second branch pipe 220. The medium flows through the instrument to be tested to the first branch pipe 210. The second branch pipe 220 and the first branch pipe 210 are interconnected. The medium flows through the third branch pipe 230 into the metering cylinder 100 on the first medium port 110 side. The volume of the metering cylinder 100 on the first medium port 110 side is in an expanded state, so the medium pressure fluctuation in the entire pipeline is small.

[0024] The medium pressure stabilizing tank 300 forms a stable and sealed medium space with the metering cylinder 100 through the third branch pipe 230. The medium in the sealed space can be liquid or gas. In this sealed space, the pressure pulsation is absorbed by the elasticity of compressed gas, thereby improving the accuracy of the test.

[0025] This application relates to a test device for the error of the reading and the influence of pressure on the gas-liquid flow meter. The piston body 400 includes a piston disc 410, a first sliding rod 420, and a second sliding rod 430. The piston disc 410 isolates the inner cavity of the metering cylinder 100 into two chambers, left and right. The reciprocating motion of the piston body 400 within the metering cylinder 100 changes the volume of the inner cavity on both sides. When the volume of one chamber within the metering cylinder 100 is compressed, the medium in this chamber overflows through the first medium port 110 to the first branch pipe 210. The first branch pipe 210 is interconnected with the third branch pipe 230, and the second branch pipe 220 is interconnected with the third branch pipe 230. The medium in the first branch pipe 210 flows sequentially through the third branch pipe 230 and the second branch pipe 220 to the second medium port 120 of the other chamber within the metering cylinder 100, thus expanding the volume of this chamber. The connection port 310 of the medium pressure stabilizing tank 300 is connected to the third branch pipe 210. The 30 pipes are interconnected, and the medium in the entire pipeline is in a closed state with small pressure fluctuations. The instrument to be tested is set between the first branch pipe 210 and the third branch pipe 230. When the medium flows from the first branch pipe 210 through the third branch pipe 230, the instrument to be tested can measure the flow rate of the medium flowing through its own equipment. The electronic controller 600 can calculate the medium flow rate based on the displacement of the first sliding and the vertical axial cross-sectional area of ​​the metering cylinder 100. By comparing the calculated medium flow rate with the medium flow rate measured by the instrument to be tested, the error of the gas-liquid flow meter reading and the influence of pressure can be tested. The motor 510 of the power mechanism 500 drives the lead screw assembly 520 to rotate forward. When the lead screw assembly 520 rotates forward, it drives the first sliding rod 420, the piston disc 410 and the second sliding rod 430 to move towards the first medium port 110, thereby squeezing the medium to flow from the first branch pipe 210 through the third branch pipe 230. This measures the forward reading of the gas-liquid flow meter.

[0026] The motor 510 of the power mechanism 500 drives the lead screw assembly 520 to reverse. When the lead screw assembly 520 reverses, it drives the first sliding rod 420, the piston disc 410 and the second sliding rod 430 to move towards the second medium port 120, thereby squeezing the medium to flow from the third branch pipe 230 through the first branch pipe 210. The piston returns to the initial position. The working pressure of the medium stabilizing tank 300 can be set arbitrarily. There is no kinetic energy conversion during the test, the pressure fluctuation is small, the noise is low, and automatic detection can be realized. The test device is equipped with a parallel stabilizing tank 300, which effectively improves the influence of pressure pulsation on the test results and improves the test accuracy of the gas-liquid flow meter reading error.

[0027] like Figure 2As shown in one embodiment of this application, the metering cylinder 100 is further provided with a third medium port 130 and a fourth medium port 140. The third medium port 130 is located at one end of the metering cylinder 100. The third medium port 130 is located near the first sliding rod 420. The third medium port 130 is located away from the first medium port 110. The fourth medium port 140 is located at the other end of the metering cylinder 100. The fourth medium port 140 is located near the second sliding rod 430. The fourth medium port 140 is located away from the second medium port 120.

[0028] Understandably, the first medium port 110 and the third medium port 130 are located at the same end of the metering cylinder 100, with the first medium port 110 located on the side of the metering cylinder 100 closer to the ground and the third medium port 130 located on the side of the metering cylinder 100 farther from the ground.

[0029] The second medium port 120 and the fourth medium port 140 are located at the same end of the metering cylinder 100. The second medium port 120 is located on the side of the end of the metering cylinder 100 closer to the ground, and the fourth medium port 140 is located on the side of the end of the metering cylinder 100 away from the ground.

[0030] An instrument to be tested can be connected between the first media port 110 and the second media port 120.

[0031] Another instrument to be tested can be connected between the third media port 130 and the fourth media port 140.

[0032] When the piston disc 410 slides inside the metering cylinder 100, the two gas-liquid flow meters are tested separately. Under normal circumstances, one gas-liquid flow meter is being tested while the other is being installed. This can improve the testing efficiency of the gas-liquid flow meter readings.

[0033] Understandably, when the first valve 261 and the second valve 262 are closed, and the third valve 263 and the fourth valve 264 are open, the volume of the chamber near the third medium port 130 in the metering cylinder 100 is compressed. The medium in this chamber overflows through the third medium port 130 to the fourth branch pipe 240. The fourth branch pipe 240 and the fifth branch pipe 250 are interconnected. The medium flows through the fifth branch pipe 250 to the fourth medium port 140 of another chamber in the metering cylinder 100. The volume of this chamber expands, and the medium in the entire pipeline is in a closed state. The pressure fluctuation of the medium is small. The second instrument to be tested is set between the fourth branch pipe 240 and the fifth branch pipe 250. When the medium flows from the fourth branch pipe 240 through the fifth branch pipe 250, the second instrument to be tested can measure the flow rate of the medium flowing through its own equipment.

[0034] The electronic controller 600 can calculate the medium flow rate, i.e. the standard piston flow rate, based on the displacement of the first sliding rod 420 and the vertical axial cross-sectional area of ​​the metering cylinder 100. By comparing the standard piston flow rate with the medium flow rate measured by the second instrument to be tested, the error of the gas-liquid flow meter and the pressure influence characteristics can be obtained.

[0035] like Figure 1 and Figure 2 As shown in one embodiment of this application, the air conduit 200 further includes a fourth branch pipe 240 and a fifth branch pipe 250. The fourth branch pipe 240 is connected to a third valve 263. The fifth branch pipe 250 is connected to a fourth valve 264. The fourth branch pipe 240 is in communication with the third medium port 130. The fifth branch pipe 250 is in communication with the fourth medium port 140. The fourth branch pipe 240 and the fifth branch pipe 250 are in communication with each other. A second instrument to be tested is disposed between the fourth branch pipe 240 and the fifth branch pipe 250.

[0036] Specifically, such as Figure 1 M2 is the second instrument to be tested.

[0037] Understandably, the instrument to be tested is positioned between the fourth branch pipe 240 and the fifth branch pipe 250.

[0038] The fourth branch pipe 240 is close to the third medium port 130, and the fourth branch pipe 240 diverts the medium in the third medium port 130 to the fourth branch pipe 240. When the fourth branch pipe 240 diverts the medium in the third medium port 130 to the fourth branch pipe 240, the medium flows through the instrument to be tested, and the fifth branch pipe 250 serves as the return port for the medium, guiding the medium to the metering cylinder 100.

[0039] The fifth branch pipe 250 is close to the fourth medium port 140, and the fifth branch pipe 250 diverts the medium in the fourth medium port 140 to the fifth branch pipe 250. When the medium flows through the instrument to be tested, the fourth branch pipe 240 acts as a return port for the medium, guiding the medium to the metering cylinder 100.

[0040] The fourth branch pipe 240, the instrument to be tested, and the fifth branch pipe 250 can form a closed pipeline loop, thereby allowing the test working pressure to be preset.

[0041] like Figure 2 As shown, in one embodiment of this application, the central axis of the first sliding rod 420 coincides with the central axis of the piston disc 410. The central axis of the second sliding rod 430 coincides with the central axis of the piston disc 410. The central axis of the piston disc 410 coincides with the central axis of the metering cylinder 100.

[0042] Understandably, the central axes of the first sliding rod 420, the second sliding rod 430, and the piston disc 410 coincide. The piston body 400, formed by the piston disc 410, the first sliding rod 420, and the second sliding rod 430, all sharing the same central axis, moves axially along this axis. The movement speed of the piston disc 410 is controlled by the motor 510. This reduces pressure variations in the medium, preventing pressure changes from affecting the metering performance of the instrument being tested during the flow measurement process.

[0043] The central axis of the piston disc 410 coincides with the central axis of the metering cylinder 100. The piston disc 410 is disposed in the inner cavity of the metering cylinder 100. The side wall of the piston disc 410 abuts against the inner cavity side wall of the metering cylinder 100. A sealing element is provided between the piston disc 410 and the inner cavity side wall of the metering cylinder 100 to prevent leakage at both ends of the piston disc 410.

[0044] like Figure 2 As shown, in one embodiment of this application, the central axis of the lead screw assembly 520 coincides with the central axis of the internal threaded hole 440. The central axis of the power shaft of the motor 510 coincides with the central axis of the lead screw assembly 520. The depth of the internal threaded hole 440 is equal to the length of the lead screw assembly 520. The central axis of the internal threaded hole 440 coincides with the central axis of the second sliding rod 430.

[0045] Understandably, the central axis of the lead screw assembly 520 coincides with the central axis of the internal threaded hole 440. The lead screw assembly 520 can rotate relative to the second sliding rod 430 around its own central axis. The lead screw assembly 520 has an external thread, and the internal threaded hole 440 of the second sliding rod 430 has an internal thread. When the lead screw assembly 520 can rotate relative to the second sliding rod 430 around its own central axis, the second sliding rod 430 will reciprocate along its own central axis.

[0046] The second sliding rod 430 reciprocates along its own central axis with the piston disc 410.

[0047] Driven by the lead screw assembly 520, the second sliding rod 430 moves unidirectionally toward the first medium port 110 of the metering cylinder 100 along with the piston disc 410, and the volume of the metering cylinder 100 on the first medium port 110 side decreases.

[0048] Driven by the lead screw assembly 520, the second sliding rod 430 moves unidirectionally toward the second medium port 120 of the metering cylinder 100 along with the piston disc 410, and the volume of the metering cylinder 100 on the second medium port 120 side decreases.

[0049] like Figure 2As shown, in one embodiment of this application, the length of the first sliding rod 420 is greater than the vertical distance between the two ends of the metering cylinder 100. The length of the second sliding rod 430 is equal to the length of the first sliding rod 420. The length of the lead screw assembly 520 is equal to the length of the second sliding rod 430.

[0050] Understandably, the metering cylinder 100 is provided with a first guide hole 150 and a second guide hole 160. A first sliding rod 420 is disposed inside the first guide hole 150, and a second sliding rod 430 is disposed inside the second guide hole 160. When the second sliding rod 430 drives the piston disc 410 to move unidirectionally towards the first medium port 110 of the metering cylinder 100, the second sliding rod 430 extends into the metering cylinder 100. The length of the second sliding rod 430 is greater than the vertical distance between the two ends of the metering cylinder 100, which prevents the piston body 400 from slipping out of the metering cylinder 100. When the second sliding rod 430 drives the piston disc 410 to move unidirectionally towards the second medium port 120 of the metering cylinder 100, the first sliding rod 420 extends into the metering cylinder 100. The length of the first sliding rod 420 is greater than the vertical distance between the two ends of the metering cylinder 100, which prevents the piston body 400 from slipping out of the metering cylinder 100.

[0051] The length of the lead screw assembly 520 is equal to the length of the second sliding rod 430. The distance of relative movement between the lead screw assembly 520 and the second sliding rod 430 can be equal to that of the second sliding rod 430, thereby enabling the piston disc 410 to slide a greater distance in the metering cylinder 100. The greater the sliding distance of the piston disc 410, the greater the test range of the metering cylinder 100.

[0052] like Figure 4 As shown in one embodiment of this application, the medium pressure stabilizing tank 300 is provided with an inflation valve 320, a water inlet valve 330, and a water outlet valve 340. The inflation valve 320 is located at the top of the medium pressure stabilizing tank 300. The water outlet valve 340 is located at the bottom of the medium pressure stabilizing tank 300. The water inlet valve 330 is interconnected with the medium pressure stabilizing tank 300. The water inlet valve 330 is located between the inflation valve 320 and the water outlet valve 340, and is in a closed state during testing.

[0053] Understandably, the medium pressure stabilizing tank 300 can be filled with gas through the gas filling valve 320 located at the top of the medium pressure stabilizing tank 300, so that the gas can be used as a medium in the closed pipeline and metering cylinder 100 as a test medium.

[0054] The medium pressure stabilizing tank 300 can be filled with liquid through the drain valve 340, using the liquid as the test medium in the closed pipeline and metering cylinder 100. It is worth noting that when the test medium in the medium pressure stabilizing tank 300 is liquid, high-pressure gas also needs to be introduced through the air filling valve 320 to reduce internal pressure fluctuations caused by liquid level fluctuations.

[0055] When the test is completed, the liquid and gas can be released from the medium pressure stabilizing tank 300 through the drain valve 340 at the bottom of the medium pressure stabilizing tank 300.

[0056] like Figure 5 As shown in one embodiment of this application, the electronic controller 600 includes a processing terminal 610, a grating ruler 620, and a light control beacon 630. The processing terminal 610 is communicatively connected to the grating ruler 620. The processing terminal 610 is communicatively connected to the light control beacon 630. The grating ruler 620 is positioned close to the first sliding rod 420. The light control beacon 630 is positioned close to the first sliding rod 420.

[0057] Understandably, the grating ruler 620 is positioned close to the first sliding rod 420. The grating ruler 620 emits a grating towards the first sliding rod 420 during its movement. The optical beacon 630, positioned close to the first sliding rod 420, can receive the reflected grating. The processing terminal 610 is communicatively connected to the optical beacon 630 and can calculate the moving distance and moving time of the first sliding rod 420. Based on the moving distance of the first sliding rod 420, the metering cylinder 100, and the circular cross-sectional area of ​​the metering cylinder 100, the calculated medium flow rate can be obtained.

[0058] In one embodiment of this application, the medium in the inner cavity of the medium pressure stabilizing tank 300 is high-pressure gas.

[0059] In one embodiment of this application, the height of the liquid level of the medium in the medium pressure stabilizing tank 300 from the bottom of the medium pressure stabilizing tank 300 is 20% to 90% of the height of the medium pressure stabilizing tank 300. The horizontal height of the connection port 310 is lower than the liquid level of the medium in the medium pressure stabilizing tank 300.

[0060] Understandably, when the medium is liquid, a dynamic detection method can be used to perform the test. The medium pressure tank 300 is equipped with a connection port 310, which can inject pressurized liquid medium into the third branch pipe 230. The motor 510 is started, keeping the liquid medium in the entire pipeline and the metering cylinder 100 in a full state. When the liquid is completely filled into the experimental device, the motor 510 is restarted, causing the piston plate 410 to move unidirectionally towards the first medium port 110 of the metering cylinder 100, or unidirectionally towards the second medium port 120 of the metering cylinder 100.

[0061] The processing terminal 610, grating ruler 620 and optical beacon 630 of the electronic controller 600 obtain the calculated medium flow rate, and the gas-liquid flow meter measures the medium flow rate.

[0062] It will be apparent to those skilled in the art that the present invention is not limited to the details of the exemplary embodiments described above, and that the present invention can be implemented in other specific forms without departing from the spirit or essential characteristics of the present invention.

[0063] Finally, it should be noted that the above embodiments are only used to illustrate the technical solutions of the present invention and are not intended to limit it. Although the present invention has been described in detail with reference to preferred embodiments, those skilled in the art should understand that modifications or equivalent substitutions can be made to the technical solutions of the present invention without departing from the spirit and scope of the technical solutions of the present invention.

Claims

1. A test apparatus for the error of a gas-liquid flow meter reading and the influence of pressure, characterized in that, include: The metering cylinder is provided with a first medium port and a second medium port, the first medium port being located at one end of the metering cylinder and the second medium port being located at the other end of the metering cylinder; The air conduit includes a first branch pipe, a second branch pipe, and a third branch pipe. The first branch pipe is connected to a first valve, and the third branch pipe is connected to a second valve. The first medium port is connected to the first branch pipe, the second medium port is connected to the second branch pipe, the first branch pipe is connected to the third branch pipe, and the second branch pipe is connected to the third branch pipe. The first instrument to be tested is disposed between the first branch pipe and the third branch pipe. A medium pressure stabilizing tank is provided with a connection port located near the bottom of the medium pressure stabilizing tank and connected to the third branch pipe. The medium can be gas or liquid. The medium pressure stabilizing tank is filled with gas via an inflation valve located at its top, using the gas as the test medium in a closed pipeline and metering cylinder. The medium pressure stabilizing tank is also filled with liquid via a drain valve located at its top, using the liquid as the test medium in a closed pipeline and metering cylinder. When the test medium in the medium pressure stabilizing tank is liquid, high-pressure gas is introduced via the inflation valve. The piston body includes a piston disc, a first sliding rod, and a second sliding rod. The first sliding rod is fixed to one side wall of the piston disc, and the second sliding rod is fixed to the other side wall of the piston disc. The piston disc is disposed in the inner cavity of the metering cylinder, and the side wall of the piston disc abuts against the inner cavity side wall of the metering cylinder. The first sliding rod is disposed near the first medium port, and the second sliding rod is disposed near the second medium port. The metering cylinder is provided with a first guide hole and a second guide hole. The first sliding rod is disposed inside the first guide hole, and the second sliding rod is disposed inside the second guide hole. The power mechanism includes a motor and a lead screw assembly. The power shaft of the motor is fixedly connected to one end of the lead screw assembly. The second sliding rod is provided with an internal threaded hole. The lead screw nut of the lead screw assembly is connected to the second sliding rod. An electronic controller is positioned close to the first sliding rod, and the central axis of the electronic controller coincides with the central axis of the first sliding rod.

2. The test apparatus for the error of the gas-liquid flow meter reading and the influence of pressure according to claim 1, characterized in that, The metering cylinder is also equipped with a third medium port and a fourth medium port; The third medium port is located at one end of the metering cylinder; The third medium port is located close to the first sliding rod; The third medium port is located away from the first medium port; The fourth medium port is located at the other end of the metering cylinder; The fourth medium port is located near the second sliding rod; The fourth media port is located away from the second media port.

3. The test apparatus for the error of the gas-liquid flow meter reading and the influence of pressure according to claim 2, characterized in that, The ventilation tube also includes a fourth branch tube and a fifth branch tube; The fourth branch pipe is connected to the third valve; The fifth branch pipe is connected to the fourth valve; The fourth branch pipe is connected to the third medium port; The fifth branch pipe is connected to the fourth medium port; The fourth branch pipe is connected to the fifth branch pipe; The second instrument to be tested is positioned between the fourth branch pipe and the fifth branch pipe.

4. The test apparatus for the error of the gas-liquid flow meter reading and the influence of pressure according to claim 3, characterized in that, The central axis of the first sliding rod coincides with the central axis of the piston disk; The central axis of the second sliding rod coincides with the central axis of the piston disc; The central axis of the piston disc coincides with the central axis of the metering cylinder.

5. The test apparatus for the error of the gas-liquid flow meter reading and the influence of pressure according to claim 4, characterized in that, The central axis of the lead screw assembly coincides with the central axis of the internal threaded hole. The central axis of the motor's power shaft coincides with the central axis of the lead screw assembly; The depth of the internal threaded hole is equal to the length of the lead screw assembly; The central axis of the internal threaded hole coincides with the central axis of the second sliding rod.

6. The test apparatus for the error of the gas-liquid flow meter reading and the influence of pressure according to claim 5, characterized in that, The length of the first sliding rod is greater than the vertical distance between the two ends of the metering cylinder; The length of the second sliding rod is equal to the length of the first sliding rod; The length of the lead screw assembly is equal to the length of the second sliding rod.

7. The test apparatus for the error of the gas-liquid flow meter reading and the influence of pressure according to claim 6, characterized in that, The medium pressure stabilizing tank is equipped with an air filling valve, a water inlet valve, and a water outlet valve; The inflation valve is located at the top of the medium pressure stabilizing tank; The drain valve is located at the bottom of the medium pressure stabilizing tank; The water inlet valve is connected to the medium pressure stabilizing tank; The inlet valve is located between the air inlet valve and the outlet valve.

8. The test apparatus for the error of the gas-liquid flow meter reading and the influence of pressure according to claim 7, characterized in that, The electronic controller includes a processing terminal, a grating ruler, and a light control beacon; The processing terminal is communicatively connected to the grating ruler; The processing terminal is communicatively connected to the optical beacon. The grating ruler is positioned close to the first sliding rod; The light-controlled beacon is positioned close to the first sliding rod.

9. The test apparatus for the error of the gas-liquid flow meter reading and the influence of pressure according to claim 8, characterized in that, The medium inside the medium pressure stabilizing tank is high-pressure gas.

10. The test apparatus for the error of the gas-liquid flow meter reading and the influence of pressure according to claim 9, characterized in that, The height of the liquid level of the medium in the medium pressure stabilizing tank from the bottom of the medium pressure stabilizing tank is within the range of 20% to 90% of the height of the medium pressure stabilizing tank; The horizontal height of the connection port is lower than the liquid level of the medium in the medium pressure stabilizing tank.

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