Venturi tube performance measuring device and venturi tube performance measuring method

Abstract

The present invention discloses a venturi performance measurement device and a venturi performance measurement method. The measurement device includes: a flow resistance simulator, the gas channel of the flow resistance simulator has a gas outlet and multiple gas inlets, the gas has different flow resistance when it passes through each gas inlet and is discharged to the gas outlet through the gas channel, and the gas outlet of the flow resistance simulator is used to connect to the suction channel of the venturi. Multiple inlet pipelines and multiple first control valves, each gas inlet of the flow resistance simulator is connected to an inlet pipeline, and each inlet pipeline is provided with a first control valve. A flow meter, the flow meter is used to measure the gas flow through the inlet pipeline. An air supply assembly, the air supply assembly is used to provide high-pressure gas to the air inlet channel of the venturi. A first pressure sensor, the first pressure sensor is used to measure the air pressure at the inlet of the suction channel of the venturi. The above device can quickly and standardly measure the overall performance of the venturi.

Description

Technical Field

[0001] The present invention relates to the technical field of venturi tube measuring devices, and in particular to a venturi tube performance measuring device and a venturi tube performance measuring method. Background Art

[0002] Internal combustion engines, especially gasoline engines, use fuel (gasoline) with high volatility. Therefore, when the engine is stopped or refueled, a carbon canister (with porous activated carbon as the active ingredient) is used to absorb the fuel volatilized from the tank. When the engine is running, the fuel vapor absorbed by the carbon canister is introduced into the engine for combustion. For this reason, on a supercharged engine, there will be a pressure point higher than the atmospheric pressure. Currently, the Venturi phenomenon is used to create low pressure with high pressure, and the air in the environment is sucked in through the carbon canister with low pressure to achieve the effect of carbon canister desorption.

[0003] When the venturi works with the carbon canister, there is obvious flow resistance on the corresponding flow path, and the flow resistance is generated by the carbon canister (the flow resistance is the flow resistance of the gas flowing through the carbon canister). For the OEM, the carbon canister will be selected according to the specific situation, and its flow resistance is not exactly the same; for the venturi supplier, its products are a series of standard specifications. The current measured performance of the venturi is completed under no-load (that is, when the carbon canister flow resistance does not exist), which is far from the actual application situation.

[0004] Therefore, there is a need for a fast, standard, and repeatable measuring device and test method to measure the overall performance of the venturi tube, so that the selection of the venturi tube can be more accurately matched with the carbon canister. Summary of the invention

[0005] The present invention provides a Venturi tube performance measurement device and a Venturi tube performance measurement method for solving the above problems.

[0006] The purpose of the present invention is achieved by the following technical solutions:

[0007] A venturi performance measuring device is used to measure the performance of a venturi, wherein the venturi has an air inlet passage, an air outlet passage and a suction passage, and comprises:

[0008] A flow resistance simulator, wherein the flow resistance simulator has a gas channel, the gas channel has a gas outlet and a plurality of gas inlets, each gas inlet is connected to the gas outlet through the gas channel, and the gas has different flow resistance when it passes through each gas inlet and is discharged to the gas outlet through the gas channel, and the gas outlet of the flow resistance simulator is used to connect to the suction channel of the venturi;

[0009] A plurality of inlet pipelines and a plurality of first control valves, each gas inlet of the flow resistance simulator is respectively connected to an inlet pipeline, and each inlet pipeline is respectively provided with a first control valve for controlling the opening and closing of the inlet pipeline;

[0010] A flow meter for measuring the gas flow through the inlet pipeline;

[0011] an air supply assembly, the air supply assembly being used to provide high-pressure gas to an air inlet passage of the venturi;

[0012] A first pressure sensor is used to measure the gas pressure at the inlet of the suction channel of the venturi tube.

[0013] In one embodiment, the gas channel of the flow resistance simulator is formed by sequentially connecting a plurality of V-shaped channels that are connected end to end.

[0014] In one embodiment, the flow resistance simulator comprises a first plate and a second plate stacked together, the gas channel is formed on opposite surfaces of the first plate and / or the second plate, and a gas outlet and a plurality of gas inlets of the gas channel are formed on a side of the flow resistance simulator.

[0015] In one embodiment, the venturi performance measurement device further includes an inlet manifold, the inlet manifold is communicated with a plurality of inlet pipelines respectively, and the flow meter is disposed on the inlet manifold.

[0016] In one embodiment, the venturi performance measurement device further includes a controller, wherein the controller is connected to the first pressure sensor and the flow meter to obtain the gas pressure measured by the first pressure sensor and the gas flow measured by the flow meter.

[0017] In one embodiment, the controller is connected to the air supply assembly to control the air supply assembly to provide high-pressure gas of a preset pressure to the intake passage of the venturi tube, and the venturi tube performance measurement device also includes a second pressure sensor connected to the controller, and the second pressure sensor is used to measure the gas pressure at the entrance of the intake passage of the venturi tube.

[0018] In one embodiment, the air supply assembly includes an air source, an air supply pipeline, and a second control valve, the two ends of the air supply pipeline are respectively connected to the air source and the air intake passage of the venturi tube, the second control valve is arranged on the air supply pipeline, and the controller is connected to the second control valve and controls the operation of the second control valve so that the air supply assembly provides high-pressure gas of a preset pressure to the air intake passage of the venturi tube.

[0019] In one embodiment, the controller is respectively connected to the plurality of first control valves to control the first control valves to open or close the inlet pipeline.

[0020] In one embodiment, the air supply component includes an air source, an air supply pipeline and a second control valve, the two ends of the air supply pipeline are respectively connected to the air source and the air inlet passage of the venturi tube, the second control valve is arranged on the air supply pipeline, the second control valve is used to control the air supply component to provide high-pressure gas of a preset pressure to the air inlet passage of the venturi tube, and the first control valve and the second control valve are manual valves.

[0021] A method for measuring performance of a venturi tube, using any one of the above-mentioned venturi tube performance measuring devices, the method for measuring performance of a venturi tube comprising:

[0022] Step S1: controlling the gas supply assembly to provide high-pressure gas of a preset pressure to the air inlet passage of the venturi;

[0023] Step S2: controlling a first control valve to open an inlet pipeline, and controlling the remaining first control valves to close the remaining inlet pipelines, and obtaining the gas pressure measured by the first pressure sensor and the gas flow measured by the flowmeter when different first control valves open an inlet pipeline;

[0024] Step S3: controlling the gas supply assembly to provide high-pressure gas different from the preset pressure in step S1 to the air inlet passage of the venturi tube, and repeating step S2;

[0025] Step S4: obtaining a performance diagram of the venturi tube according to the gas pressure measured by the first pressure sensor and the gas flow measured by the flow meter.

[0026] Compared with the prior art, the beneficial effects of the present invention include at least:

[0027] The venturi performance measuring device of the present invention introduces high-pressure air of a fixed pressure into the air intake passage of the venturi through an air supply component, and then opens the first control valves of the gas inlets of different flow resistance simulators in turn, so as to obtain the relationship between the flow rate passing through the flow resistance simulator and the pressure value on the intake passage of the venturi in a short time, and then by changing the pressure of the high-pressure air provided by the air supply component and repeating the above operation, a performance flow diagram of the venturi can be obtained based on the obtained data, so that the selection of the venturi can be quickly and accurately matched with the carbon canister. BRIEF DESCRIPTION OF THE DRAWINGS

[0028] Figure 1 is a schematic structural diagram of a Venturi testing device according to an embodiment of the present invention when testing a Venturi;

[0029] Figure 2 Schematic diagram of the performance of a venturi tube obtained by a venturi tube testing device according to an embodiment of the present invention.

[0030] In the figure: 1. flow resistance simulator; 11. gas channel; 12. gas inlet; 13. gas outlet; 2. flow meter; 3. first control valve; 4. inlet pipeline; 5. V-shaped channel; 6. Venturi tube; 61. air inlet channel; 62. suction channel; 63. air outlet channel; 7. inlet main pipe. DETAILED DESCRIPTION

[0031] Example embodiments will now be described more fully with reference to the accompanying drawings. However, example embodiments can be implemented in a variety of forms and should not be construed as limited to the embodiments set forth herein; rather, these embodiments are provided to make the present invention more comprehensive and complete and to fully convey the concepts of example embodiments to those skilled in the art. The same reference numerals in the figures represent the same or similar structures, and thus their repeated description will be omitted.

[0032] The words expressing position and direction described in the present invention are all explained by taking the accompanying drawings as examples, but they can be changed as needed, and all changes are included in the protection scope of the present invention.

[0033] Reference Figure 1 The present invention provides a venturi performance measuring device for measuring the performance of a venturi 6, wherein the venturi 6 has an air inlet channel 61, an air outlet channel 63 and a suction channel 62, and the venturi performance measuring device comprises: a flow resistance simulator 1, a plurality of inlet pipelines 4, a plurality of first control valves 3, a flow meter 2, an air supply assembly (not shown) and a first pressure sensor (not shown).

[0034] The flow resistance simulator 1 has a gas channel 11, and the gas channel 11 has a gas outlet 13 and multiple gas inlets 12. Each gas inlet 12 is connected to the gas outlet 13 through the gas channel 11. The gas has different flow resistance when it passes through each gas inlet 12 and is discharged to the gas outlet 13 through the gas channel 11. The gas outlet 13 of the flow resistance simulator 1 is used to connect to the suction channel 62 of the venturi 6.

[0035] Each gas inlet 12 of the flow resistance simulator 1 is connected to an inlet pipeline, and each inlet pipeline 4 is provided with a first control valve 3 for controlling the opening and closing of the inlet pipeline 4. The first control valve 3 can be a pneumatic valve or a solenoid valve, and the first control valve 3 can also be a manual valve or a valve automatically controlled by a controller.

[0036] The flowmeter 2 is used to measure the gas flow through the inlet pipe 4. When one of the inlet pipes 4 is open and the other inlet pipes 4 are closed, the flowmeter 2 measures the gas flow of the open inlet pipe 4. The flowmeter 2 is preferably installed on the inlet manifold 7 of the flow resistance simulator 1. The inlet manifold 7 is connected to the gas inlet 12 of each flow resistance simulator 1 in sequence through a plurality of inlet pipes 4 as branch pipes, so that when working, the flowmeter 2 can obtain the instantaneous flow through the flow resistance simulator 1, and the magnitude of the instantaneous flow can also intuitively show the adsorption capacity of the venturi 6 on the flow resistance simulator 1 at this moment. By introducing high-pressure air of a fixed pressure into the air inlet channel 61 of the venturi 6, and then opening the first control valve 3 of the gas inlet 12 of different flow resistance simulators 1 in sequence, the relationship between the flow through the flow resistance simulator 1 at this time and the pressure value on the suction channel 62 of the venturi 6 can be obtained in a short time.

[0037] The air supply assembly is used to provide high-pressure gas to the air inlet channel 61 of the venturi tube 6. The pressure sensor is used to measure the gas pressure at the entrance of the suction channel 62 of the venturi tube 6. The venturi tube has an air inlet channel 61 and an air outlet channel 63. When the high-pressure gas is introduced into the air inlet channel 61, the pipe inside the air inlet channel 61 of the venturi tube 6 gradually narrows in the direction from the air inlet channel 61 to the air outlet channel 63. As the pipe narrows, air is ejected from the air outlet channel 63 on the other side, which will generate a certain suction force in the suction channel 62. By introducing air of fixed pressure into the air inlet channel 61 of the venturi tube 6 through the air supply assembly, a certain air pressure will be generated at the suction channel 62 of the venturi tube 6 corresponding to the flow resistance simulator 1, and the air in the flow resistance simulator 1 will be sucked in. Open the corresponding first control valve 3 in sequence, and close the remaining first control valves 3. At this time, the flow resistance simulator 1 has a fixed flow resistance. Record the pressure reading on the first pressure sensor and the flow reading of the flow meter 2 when the air flow passes through. Then close the first control valve 3 and open the other first control valves 3. Repeat the use of the air supply assembly to supply air at equal pressure, and record the reading of the first pressure sensor and the flow reading of the flow meter 2. Finally, adjust the gas pressure introduced by the air supply assembly to the air intake passage 61, repeat the above operation, and record the pressure reading on the first pressure sensor and the flow reading of the flow meter 2. Obtain the data of multiple air pressure points of the venturi 6 to form an air pressure data graph, thereby simulating the air pressure data when the venturi 6 and the carbon canister are used together. According to the combination of various carbon canisters and venturi 6 simulated by the flow resistance simulator 1, select the venturi 6 that is most suitable for the carbon canister with the flow resistance under the introduced air pressure.

[0038] Preferably, the gas channel 11 of the flow resistance simulator 1 is formed by connecting a plurality of V-shaped channels 5 connected end to end in sequence, and each gas inlet 12 is located at the top of each V-shaped channel 5. Since the flow resistance simulator 1 has a plurality of inlet pipes 4 for air intake and a unique gas channel 11 for air outlet, when working, a first control valve 3 is opened, and air will pass through the flow resistance simulator 1 along a unique fixed path and flow out from the unique gas channel 11, so that the channel composed of a specified number of V-shaped channels in the flow resistance simulator 1 at this time has a fixed flow resistance. By opening a plurality of different first control valves 3 in sequence, the flow path of the air can be changed, and then the flow resistance simulator 1 can simulate different resistance values, and simulate the matching conditions of different carbon canisters and venturi tubes 6 in reality. The flow resistance size is simulated by the flow resistance simulator 1 of the above structure, which not only has a simple control logic and can automatically obtain data, but also the resistance value can be linearly increased or decreased.

[0039] In one embodiment, the flow resistance simulator 1 includes a first plate and a second plate stacked together, the first plate and the second plate are, for example, metal plates, the gas channel 11 is formed on the opposite surfaces of the first plate and / or the second plate, and the gas outlet 13 and multiple gas inlets 12 of the gas channel 11 are formed on the side of the flow resistance simulator 1. The flow resistance simulator 1 is a block structure with a rectangular cross-section, wherein a plurality of V-shaped channels 5 are provided on a side plate on one side, the V-shaped channels 5 are connected end to end in sequence, and a V-shaped channel 5 has at least two openings, and the first control valve 3 is installed on the inlet pipeline 4 at the corresponding opening, and the flow path of the gas flowing through the flow resistance simulator 1 can be changed by manually screwing the first control valve 3 at the corresponding position or automatically controlling the first control valve 3, thereby changing the flow resistance of the gas flowing through the flow resistance simulator 1. In the flow resistance simulator 1 composed of the first plate and the second plate, the sealing performance of the part other than the gas channel 11 is good.

[0040] Preferably, the venturi performance measuring device further comprises an inlet manifold 7, wherein the inlet manifold 7 is respectively connected to a plurality of inlet pipelines 4, and the flowmeter 2 is arranged on the inlet manifold 7. The flowmeter 2 is fixed in the inlet manifold 7, and when any one of the first control valves 3 is opened, the flowmeter 2 in the inlet manifold 7 can respectively measure the air flow on the corresponding inlet pipeline 4.

[0041] Preferably, the venturi performance measurement device further includes a controller (not shown), which is connected to the first pressure sensor and the flow meter 2 to obtain the gas pressure measured by the first pressure sensor and the gas flow measured by the flow meter 2. When working, the controller is electrically connected to the first pressure sensor and the flow meter 2, respectively. The first pressure sensor transmits the pressure data generated by the air to the controller, and the flow meter 2 transmits the measured gas flow data to the controller. The controller can be connected to other devices. By setting the controller, the pressure data can be automatically acquired and analyzed, thereby realizing the automatic drawing of the pressure and flow performance diagram of the venturi 6.

[0042] Specifically, the controller can be connected to the gas supply assembly to control the gas supply assembly to provide high-pressure gas of a preset pressure to the air inlet channel 61 of the venturi 6. The venturi performance measurement device further includes a second pressure sensor (not shown) connected to the controller, and the second pressure sensor is used to measure the gas pressure at the entrance of the air inlet channel 61 of the venturi 6. The gas supply assembly controls the pressure of the gas delivered to the air inlet channel 61 of the venturi 6 through the controller, so that during the test, the tester can operate at a safe distance. The air pressure at the entrance of the intake channel 61 of the venturi tube 6 and the air pressure at the entrance of the suction channel 62 are respectively measured by the correspondingly arranged second pressure sensor and the first pressure sensor, which can quickly reflect the air pressure at the above two places. By setting the second pressure sensor, the second pressure sensor can accurately obtain the air pressure at the entrance of the intake channel 61 of the venturi tube 6, and feed back the air pressure value to the controller. The controller adjusts the high-pressure gas of the preset pressure according to the fed-back air pressure value, so that the air pressure at the entrance of the intake channel 61 of the venturi tube 6 is always maintained within the preset range, which is conducive to obtaining a more accurate pressure-flow performance diagram of the venturi tube 6.

[0043] Preferably, the gas supply assembly includes an air source, an air supply pipeline and a second control valve, the two ends of the air supply pipeline are respectively connected to the air source and the air inlet channel 61 of the venturi 6, the second control valve is arranged on the air supply pipeline, and the controller is connected to the second control valve and controls the operation of the second control valve so that the air supply assembly provides high-pressure gas of a preset pressure to the air inlet channel 61 of the venturi 6. When working, the air supply assembly can be provided with an air source by an air pump or an air storage tank, and the air source is transported to the air inlet channel 61 of the venturi 6 through the air supply pipeline, and the second control valve is arranged on the air inlet channel 61, and the second control valve controls the internal cut-off area through the controller, so that the air supply assembly provides high-pressure gas of a preset pressure in the air inlet channel 61 of the venturi 6, and the second control valve can be a solenoid valve or an electric valve, and the technician can directly operate it on the control panel connected to the controller during operation, thereby controlling the solenoid valve or the electric valve, saving time and effort.

[0044] Preferably, the controller is respectively connected to the plurality of first control valves 3 to control the first control valves 3 to open or close the inlet pipeline 4. The controller controls the plurality of first control valves 3 simultaneously. During actual measurement, the controller can quickly and safely control the opening or closing of the first control valves 3 at different positions without manual adjustment, thus saving time, shortening the test cycle, and facilitating the automated control of the test, thereby realizing the automatic drawing of the pressure-flow performance diagram of the venturi tube 6.

[0045] In one embodiment, the air supply component includes an air source, an air supply pipeline and a second control valve, the two ends of the air supply pipeline are respectively connected to the air source and the air inlet channel 61 of the venturi tube 6, the second control valve is arranged on the air supply pipeline, and the second control valve is used to control the air supply component to provide high-pressure gas of a preset pressure to the air inlet channel 61 of the venturi tube 6, and the first control valve 3 and the second control valve are manual valves.

[0046] When measuring the performance of the Venturi tube 6, first adjust and control the second control valve to be in an open state, and control the air pressure entering the air inlet channel 61 of the Venturi tube 6 through the second control valve, then manually open the first control valves 3 at multiple positions in turn to allow the gas inlet 12 of the flow resistance simulator 1 to enter, and measure the air pressure on the suction channel 62 of the Venturi tube 6 and the flow rate in the flow resistance simulator 1 when the corresponding first control valve 3 is opened, and obtain the pressure-flow performance diagram of the Venturi tube 6 through multiple measurements.

[0047] The present invention also provides a method for measuring the performance of a venturi tube, using the above-mentioned venturi tube performance measuring device, the method for measuring the performance of a venturi tube comprises:

[0048] Step S1: Control the gas supply assembly to provide high-pressure gas of a preset pressure to the inlet passage 61 of the venturi 6. Specifically, in the first test process, the gas supply assembly provides high-pressure gas of, for example, 50 hPa to the inlet passage 61 of the venturi 6.

[0049] Step S2: control a first control valve 3 to open an inlet pipeline 4, and control the remaining first control valves 3 to close the remaining inlet pipelines 4, and obtain the gas pressure measured by the first pressure sensor and the gas flow measured by the flowmeter 2 when different first control valves 3 open an inlet pipeline 4.

[0050] Specifically, in the first test process, one of the first control valves 3 is manually or automatically controlled to open an inlet pipeline 4 and close the remaining inlet pipelines 4, and the gas pressure at the inlet of the suction channel 62 of the venturi 6 and the gas flow rate of the opened inlet pipeline 4 are obtained through the first pressure sensor and the flowmeter 2 when the inlet channel 61 of the venturi 6 is a high-pressure gas of 50 hPa; then, another first control valve 3 is manually or automatically controlled to open an inlet pipeline 4 and close the remaining inlet pipelines 4, and the gas pressure at the inlet of the suction channel 62 of the venturi 6 and the gas flow rate of the opened inlet pipeline 4 are obtained through the first pressure sensor and the flowmeter 2 when the inlet channel 61 of the venturi 6 is a high-pressure gas of 50 hPa; the above process is repeated until the gas pressure at the inlet of the suction channel 62 of the venturi 6 and the gas flow rate of the opened inlet pipeline 4 are obtained when each inlet pipeline 4 is opened.

[0051] Step S3: Control the gas supply assembly to provide high-pressure gas different from the preset pressure in step S1 to the air inlet passage 61 of the venturi tube 6, and repeat step S2.

[0052] Specifically, in the second test process, the air supply component provides high-pressure gas of, for example, 100 hPa to the air inlet passage 61 of the venturi tube 6, and step S2 is repeated to obtain the gas pressure at the inlet of the suction passage 62 of the venturi tube 6 when each inlet pipe 4 is opened and the gas flow rate of the opened inlet pipe 4. In the third or more test processes, the air supply component provides high-pressure gas of, for example, 200 hPa, 400 hPa, 600 hPa, and 800 hPa to the air inlet passage 61 of the venturi tube 6, and step S2 is repeated to obtain the gas pressure at the inlet of the suction passage 62 of the venturi tube 6 when each inlet pipe 4 is opened and the gas flow rate of the opened inlet pipe 4 under the above-mentioned multiple high-pressure gas supply conditions.

[0053] Step S4: Obtain a performance diagram of the Venturi tube 6 according to the gas pressure measured by the first pressure sensor and the gas flow measured by the flowmeter 2. Specifically, when the gas supply assembly provides 50 hPa, 100 hPa, 200 hPa, 400 hPa, 600 hPa, and 800 hPa high-pressure gas to the inlet channel 61 of the Venturi tube 6, the gas pressure (vacuum degree) at the inlet of the suction channel 62 of the Venturi tube 6 and the gas flow of the opened inlet pipeline 4 are obtained when each inlet pipeline 4 is opened, and the performance diagrams of the Venturi tube 6 under different high-pressure gases are plotted, such as Figure 2 As shown, when selecting the venturi tube 6 according to the carbon canister, the best matching venturi tube 6 is selected according to the performance diagram of the venturi tube 6 mentioned above.

[0054] Although the embodiments of the present invention have been shown and described above, it is to be understood that the above embodiments are exemplary and are not to be construed as limitations on the present invention. A person skilled in the art may change, modify, substitute and modify the above embodiments within the scope of the invention without departing from the principles and purpose of the present invention. All such changes should fall within the scope of protection of the claims of the present invention.

Claims

1. A venturi performance measuring device, used to measure the performance of a venturi, wherein the venturi has an air inlet channel, an air outlet channel and a suction channel, It is characterized in that include: A flow resistance simulator, wherein the flow resistance simulator has a gas channel, the gas channel has a gas outlet and a plurality of gas inlets, each gas inlet is connected to the gas outlet through the gas channel, and the gas has different flow resistance when it passes through each gas inlet and is discharged to the gas outlet through the gas channel, and the gas outlet of the flow resistance simulator is used to connect to the suction channel of the venturi; A plurality of inlet pipelines and a plurality of first control valves, each gas inlet of the flow resistance simulator is respectively connected to an inlet pipeline, and each inlet pipeline is respectively provided with a first control valve for controlling the opening and closing of the inlet pipeline; A flow meter for measuring the gas flow through the inlet pipeline; an air supply assembly, the air supply assembly being used to provide high-pressure gas to an air inlet passage of the venturi; a first pressure sensor, the first pressure sensor being used to measure the gas pressure at the inlet of the suction channel of the venturi; The venturi performance measuring device further comprises an inlet manifold, wherein the inlet manifold is respectively connected with a plurality of inlet pipelines, and the flow meter is arranged on the inlet manifold.

2. The Venturi performance measuring device according to claim 1, It is characterized in that The gas channel of the flow resistance simulator is formed by sequentially connecting a plurality of V-shaped channels which are connected end to end.

3. The venturi performance measuring device according to claim 2, It is characterized in that The flow resistance simulator includes a first plate and a second plate stacked together, the gas channel is formed on opposite surfaces of the first plate and / or the second plate, and a gas outlet and a plurality of gas inlets of the gas channel are formed on a side surface of the flow resistance simulator.

4. The venturi performance measuring device according to claim 1, It is characterized in that The venturi performance measurement device further includes a controller, wherein the controller is connected to the first pressure sensor and the flow meter to obtain the gas pressure measured by the first pressure sensor and the gas flow measured by the flow meter.

5. The venturi performance measuring device according to claim 4, It is characterized in that The controller is connected to the air supply assembly to control the air supply assembly to provide high-pressure gas of a preset pressure to the air intake passage of the venturi tube. The venturi tube performance measurement device also includes a second pressure sensor connected to the controller, and the second pressure sensor is used to measure the gas pressure at the entrance of the air intake passage of the venturi tube.

6. The venturi performance measuring device according to claim 5, It is characterized in that The air supply assembly includes an air source, an air supply pipeline, and a second control valve. The two ends of the air supply pipeline are respectively connected to the air source and the air inlet passage of the venturi tube. The second control valve is arranged on the air supply pipeline. The controller is connected to the second control valve and controls the operation of the second control valve so that the air supply assembly provides high-pressure gas of a preset pressure to the air inlet passage of the venturi tube.

7. The venturi performance measuring device according to claim 4, It is characterized in that The controller is respectively connected to the plurality of first control valves to control the first control valves to open or close an inlet pipeline.

8. The venturi performance measuring device according to claim 1, It is characterized in that The air supply component includes an air source, an air supply pipeline and a second control valve. The two ends of the air supply pipeline are respectively connected to the air source and the air inlet passage of the venturi tube. The second control valve is arranged on the air supply pipeline. The second control valve is used to control the air supply component to provide high-pressure gas of a preset pressure to the air inlet passage of the venturi tube. The first control valve and the second control valve are manual valves.

9. A method for measuring the performance of a venturi tube, It is characterized in that Using the Venturi performance measurement device according to any one of claims 1 to 8, the Venturi performance measurement method comprises: Step S1: controlling the gas supply assembly to provide high-pressure gas of a preset pressure to the air inlet passage of the venturi; Step S2: controlling a first control valve to open an inlet pipeline, and controlling the remaining first control valves to close the remaining inlet pipelines, and obtaining the gas pressure measured by the first pressure sensor and the gas flow measured by the flowmeter when different first control valves open an inlet pipeline; Step S3: controlling the gas supply assembly to provide high-pressure gas different from the preset pressure in step S1 to the air inlet passage of the venturi tube, and repeating step S2; Step S4: obtaining a performance diagram of the venturi tube according to the gas pressure measured by the first pressure sensor and the gas flow measured by the flow meter.

Images