A flow rate testing device and method for preventing range overshoot and resisting gas source fluctuation interference

Abstract

This invention discloses a flow testing device and method that prevents range overshoot and resists gas source fluctuation interference. The device includes a working gas source, first to fourth two-way valves, a volumetric tank, a pressure sensor, and a flow sensor. The working gas source is connected to the product under test via the first two-way valve and a third pipeline. The first port of the second two-way valve is connected to the third pipeline via the fourth pipeline, and the second port of the second two-way valve is connected to the exhaust port. The pressure sensor is connected to the third pipeline between the fourth pipeline and the product under test. The first port of the fourth two-way valve is connected to the working gas source via the second pipeline, and the second port of the fourth two-way valve is connected to the product under test via the third two-way valve and a fifth pipeline. The flow sensor is installed on the fifth pipeline. The volumetric tank is connected to the fifth pipeline between the fourth two-way valve and the flow sensor. This invention can solve the problem of flow parameter stability during the testing of small flow parameters.

Description

Technical Field

[0001] The present invention relates to the technical field of non-destructive testing, and in particular to a flow testing device and method capable of preventing range overshoot and resisting gas source fluctuation interference. Background Art

[0002] In industrial sites, measuring fluid flow parameters is one of the most important links in industrial measurement. With the development of industry, the oil and gas, petrochemical, food and beverage, medical and automotive industries have higher and higher requirements for the accuracy and range of flow measurement. In order to adapt to various uses, various types of flow meters and measurement methods have been introduced one after another. However, in the existing flow test methods that prevent range overshoot and resist interference from gas source fluctuations, when testing small flow parameters with high test accuracy, when using existing flow inspection technology for testing, because the gas source is directly connected to the flow sensor part, there will be flow parameter fluctuations caused by the pressure oscillation of the gas source, which will cause misjudgment during the flow test process. Summary of the invention

[0003] In order to overcome the deficiencies of the prior art, one of the purposes of the present invention is to provide a flow test device that is resistant to range overshoot and gas source fluctuation interference, so as to solve the problem of flow parameter stability during the testing of small flow test parameters.

[0004] One of the purposes of the present invention is achieved by the following technical solution:

[0005] A flow test device that prevents range overshoot and resists gas source fluctuation interference, is used to test the flow parameters of a product to be tested; it includes a working gas source, a first two-way valve, a second two-way valve, a third two-way valve, a fourth two-way valve, a volume tank, a pressure sensor and a flow sensor; wherein the first interface of the first two-way valve is connected to the working gas source through a first pipeline, and the second interface of the first two-way valve is connected to the product to be tested through a third pipeline; the first interface of the second two-way valve is connected to the third pipeline through a fourth pipeline, and the second interface of the second two-way valve is connected to the exhaust port; the pressure sensor is connected to the third pipeline between the fourth pipeline and the product to be tested; the first interface of the fourth two-way valve is connected to the working gas source through a second pipeline, and the second interface of the fourth two-way valve is connected to the product to be tested through a fifth pipeline via the third two-way valve; the flow sensor is installed on the fifth pipeline; the volume tank is connected to the fifth pipeline between the fourth two-way valve and the flow sensor.

[0006] Furthermore, the flow testing device that prevents range overshoot and resists gas source fluctuation interference also includes a connecting piece; one end of the connecting piece is connected to the product to be tested, and the other end of the connecting piece is connected to the second end of the third pipeline through the seventh pipeline, and the first end of the third pipeline is connected to the second interface of the first two-way valve; the pressure sensor is connected to the third pipeline between the fourth pipeline and the second end of the third pipeline; the first interface of the third two-way valve is connected to the second interface of the fourth two-way valve through the fifth pipeline, and the second interface of the fourth two-way valve is connected to between the seventh pipeline and the third pipeline through the sixth pipeline.

[0007] Further, the connecting piece is a switch valve and / or a quick connector; when the connecting piece is a quick connector and a switch valve, the switch valve is installed in the seventh pipeline, one end of the quick connector is connected to the first end of the seventh pipeline, and the product to be tested is connected to the other end of the quick connector.

[0008] Furthermore, the flow testing device that prevents range overshoot and gas source fluctuation interference also includes a controller, which receives test data from the flow sensor and the pressure sensor, and controls the opening or closing of the first two-way valve, the second two-way valve, the third two-way valve and the fourth two-way valve.

[0009] The second purpose of the present invention is to provide a flow test method that can prevent range overshoot and resist interference from gas source fluctuations, so as to solve the problem of flow parameter stability during the testing of small flow test parameters.

[0010] The second object of the present invention is achieved by adopting the following technical solution:

[0011] A flow rate testing method for preventing range overshoot and resisting gas source fluctuation interference, which uses the flow rate testing device described in one of the purposes of the present invention to implement flow parameter testing of a product to be tested, and comprises the following steps:

[0012] Initial step: the first two-way valve, the second two-way valve, the third two-way valve and the fourth two-way valve are all in the initial state. In the initial state, the first two-way valve and the third two-way valve are in the closed state, and the fourth two-way valve and the second two-way valve are in the open state; at this time, the volume tank is connected to the working gas source through the second pipeline and the fourth two-way valve, and the volume tank is in the inflated state. At this time, the product to be tested is connected to the exhaust port via the third pipeline, the fourth pipeline and the second two-way valve, so that the product to be tested is connected to the outside atmosphere, and the first exhaust operation is performed;

[0013] Inflating step: first close the second two-way valve, then open the first two-way valve, the third two-way valve is still in the closed state, the fourth two-way valve is still in the open state, and the first timing starts; at this time, the working gas source inflates the product to be tested through the first pipeline, the first two-way valve, and the third pipeline, and at the same time, the working gas source also inflates the volume tank through the second pipeline and the fourth two-way valve; when the first timing reaches the first preset time, the test data of the pressure sensor is recorded as the first data, and then the test step is entered;

[0014] Test steps: close the first two-way valve and the fourth two-way valve, open the third two-way valve, the second two-way valve is still in the closed state, and start the second timing; at this time, the air flows out from the volume tank, flows to the product to be tested through the fifth pipeline and the third two-way valve; when the second timing reaches the second preset time, record the test data of the flow sensor as the second data, and then enter the exhaust step;

[0015] Exhaust step: close the third two-way valve, open the second two-way valve, and the first two-way valve is still in the closed state; at this time, the product to be tested is connected to the exhaust port via the third pipeline, the fourth pipeline and the second two-way valve, and the second exhaust operation is performed; after the high-pressure gas in the product to be tested is exhausted to a safe level, remove the product to be tested.

[0016] The present invention provides a flow test device and method which can prevent range overshoot and resist interference from gas source fluctuation. Compared with the prior art, the present invention has the following beneficial effects: the present invention completes the process of inflation, testing and exhaust through the cooperation of four two-way valves, a volume tank, a pressure sensor and a flow sensor. During the inflation process, the product to be tested changes from an initial state to the atmosphere to a predetermined test pressure. The airflow charged in this process is very large. Therefore, the designed inflation circuit makes the airflow not pass through the flow sensor, thereby preventing the flow sensor from over-range and preventing the flow sensor from being damaged. During the test process, the product to be tested is in a micro-flow working state under a predetermined test pressure. Through the pipeline switching of the valve, the connection between the product to be tested and an external working gas source is cut off, so that the micro-flow of the product to be tested flows from the product to be tested through the flow sensor by the gas in the volume tank. Under the micro-flow, the gas pressure of the volume tank is kept very stable, which can solve the defect of inaccurate flow parameter testing caused by external working gas source disturbance during the micro-flow test, and improve the stability of the micro-flow test as a whole. BRIEF DESCRIPTION OF THE DRAWINGS

[0017] Figure 1 It is a structural diagram of the initial / exhaust state of the flow rate testing device for preventing range overshoot and resisting gas source fluctuation interference according to an embodiment of the present invention;

[0018] Figure 2 It is a structural diagram of the inflated state of the flow rate testing device for preventing range overshoot and resisting gas source fluctuation interference according to an embodiment of the present invention;

[0019] Figure 3 It is a structural diagram of the flow rate testing device for preventing range overshoot and resisting gas source fluctuation interference in the test state according to an embodiment of the present invention;

[0020] Figure 4 The flowchart of the flow rate testing method for preventing range overshoot and resisting gas source fluctuation interference according to an embodiment of the present invention.

[0021] In the figure: 10, working gas source inlet; 11, first pipeline; 12, second pipeline; 20, first two-way valve; 21, third pipeline; 30, second two-way valve; 31, fourth pipeline; 32, exhaust port; 40, fourth two-way valve; 41, fifth pipeline; 50, volume tank; 60, third two-way valve; 61, sixth pipeline; 70, connector; 71, seventh pipeline; 80, product to be tested; 91, pressure sensor; 92, flow sensor.

[0022] Specific embodiment

[0023] The present invention is further described below in conjunction with the accompanying drawings and specific embodiments. It should be noted that, under the premise of no conflict, the embodiments or technical features described below can be arbitrarily combined to form a new embodiment. Unless otherwise specified, the materials and equipment used in this embodiment can be purchased from the market. Example

[0024] A flow test device that prevents range overshoot and gas source fluctuation interference is used to test the flow coefficient of the product to be tested (mainly for large-volume and small-flow workpieces). The flow coefficient is a quality test parameter for products such as valves (such as faucets, etc.) and regulating valves. The flow coefficient refers to the volume flow or mass flow of the pipeline medium flowing through the product to be tested under the test conditions and the constant pressure maintained in the pipeline per unit time, that is, the flow capacity.

[0025] Please refer to Figure 1As shown, a flow test device for preventing range overshoot and resisting gas source fluctuation interference includes a working gas source, a first two-way valve 20, a second two-way valve 30, a third two-way valve 60, a fourth two-way valve 40, a volume tank 50, a pressure sensor 91 and a flow sensor 92; wherein, the first interface of the first two-way valve 20 is connected to the working gas source through the first pipeline 11 via the working gas source inlet 10, and the second interface of the first two-way valve 20 is connected to the product to be tested 80 through the third pipeline 21; the first interface of the second two-way valve 30 is connected to the third pipeline 21 through the fourth pipeline 31, The second interface of the second two-way valve 30 is connected to the exhaust port 32; the pressure sensor 91 is connected to the third pipeline 21 between the fourth pipeline 31 and the product to be tested 80; the first interface of the fourth two-way valve 40 is connected to the working gas source through the second pipeline 12 via the working gas source inlet 10, and the second interface of the fourth two-way valve 40 is connected to the product to be tested 80 through the fifth pipeline 41 via the third two-way valve 60; the flow sensor 92 is installed on the fifth pipeline 41; the volume tank 50 is connected to the fifth pipeline 41 between the fourth two-way valve 40 and the flow sensor 92.

[0026] The first two-way valve 20 is used to inflate the product 80 to be tested, the fourth two-way valve 40 is used to inflate the volume tank 50, the second two-way valve 30 is used to exhaust, and the third two-way valve 60 is used for flow testing. The four two-way valves can all adopt two-position two-way solenoid valves, and the on-off (i.e., opening or closing) of the four two-position two-way solenoid valves can be controlled by a controller; of course, the four two-way valves can also adopt manual valves, which are manually controlled or have other functionally equivalent valves. The test data of the pressure sensor 91 is recorded during inflation (recorded as the first data), and the test data of the flow sensor 92 is recorded during testing (recorded as the second data), and then an evaluation is made on whether the product 80 to be tested is qualified based on the relationship between the first data and the second data.

[0027] The flow testing device that prevents range overshoot and resists gas source fluctuation interference also includes a connecting piece 70; one end of the connecting piece 70 is connected to the product to be tested 80, and the other end of the connecting piece 70 is connected to the second end of the third pipeline 21 through the seventh pipeline 71, and the first end of the third pipeline 21 is connected to the second interface of the first two-way valve 20; the pressure sensor 91 is connected to the third pipeline 21 between the fourth pipeline 31 and the second end of the third pipeline 21; the first interface of the third two-way valve 60 is connected to the second interface of the fourth two-way valve 40 through the fifth pipeline 41, and the second interface of the fourth two-way valve 40 is connected between the seventh pipeline 71 and the third pipeline 21 through the sixth pipeline 61.

[0028] The connecting piece 70 is a switch valve, or a quick connector, or a combination of a switch valve and a quick connector (when combined, the quick connector is located between the switch valve and the product to be tested 80, that is, the quick connector is used to quickly connect the product to be tested). The switch valve can be an electromagnetic valve, which is controlled by a controller. When the product to be tested 80 is connected, the switch valve is always in an open state. After the product to be tested 80 is removed, the switch valve is always in a closed state.

[0029] The flow parameter test method of the product 80 to be tested is implemented by using the above-mentioned flow test device that prevents range overshoot and resists gas source fluctuation interference. Please refer to Figure 4 As shown, it includes the following steps:

[0030] S410, Initial Steps: Please refer to Figure 1 As shown, the first two-way valve 20, the second two-way valve 30, the third two-way valve 60 and the fourth two-way valve 40 are all in an initial state. In the initial state, the first two-way valve 20 and the third two-way valve 60 are in a closed state, and the second two-way valve 30 and the fourth two-way valve 40 are in an open state; at this time, the volume tank 50 is connected to the working gas source through the second pipeline 12 and the fourth two-way valve 40, and the volume tank 50 is in an inflated state. At this time, the product to be tested 80 is connected, and the product to be tested 80 is connected to the exhaust port 32 via the third pipeline 21, the fourth pipeline 31 and the second two-way valve 30 (wherein the thick line is the airflow path and the arrow is the airflow direction), and the first exhaust operation is performed.

[0031] In the initial step, the exhaust time can be set. When the exhaust time is reached, the first exhaust operation is terminated and the inflation step is entered. The exhaust operation is set in the initial step mainly to prevent the gas in the product 80 to be tested from causing errors in the first data of the subsequent inflation step. The first preset pressure value can also be set for the initial step. When the exhaust time is reached and the test data of the pressure sensor 91 is less than the first preset pressure value, the first exhaust operation is terminated; the first preset pressure value can be a smaller value based on reaching a safety level.

[0032] S420, inflation steps: please refer to Figure 2 As shown, first close the second two-way valve 30, then open the first two-way valve 20, the third two-way valve 60 is still in a closed state, and the fourth two-way valve 40 is still in an open state, and the first timing starts; at this time, the working gas source inflates the product to be tested 80 through the first pipeline 11, the first two-way valve 20, and the third pipeline 21, and at the same time, the working gas source continues to inflate the volume tank 50 through the second pipeline 12 and the fourth two-way valve 40 (wherein the thick line is the airflow path and the arrow is the airflow direction). When the first timing reaches the first preset time (recorded as the inflation time), the test data of the pressure sensor 91 is recorded as the first data, and then the test step is entered.

[0033] In the inflation step, the reason for inflating through the first two-way valve 20 is that, at the moment of inflation, the airflow injected into the product to be tested 80 by the pipeline is very large. If the fourth two-way valve 40 and the third two-way valve 60 are used for inflation, it will cause serious over-inflation or even damage to the flow sensor 92. At the same time, inflating through the first two-way valve 20 can speed up the inflation rate and make the gas stabilize quickly before testing, thereby improving the reliability and efficiency of the flow test.

[0034] After the inflation starts, the inflation process is timed by the controller (internal clock chip) or the corresponding timing device. When the inflation time is reached, the timing of this step and the switch to the next step can be completed intelligently, for example, a time relay or timer is set between the controller and the four two-position two-way solenoid valves. After the first preset time is completed, the test step is entered.

[0035] The reason for setting the inflation time is that there may be a certain error in the instantaneous pressure value. Therefore, by obtaining the pressure value per unit time within a period of time and comparing it with the preset related data, the test can be made more accurate. At the same time, according to the set inflation time, it is also convenient to make horizontal comparisons of all similar products.

[0036] S430, test steps: please refer to Figure 3 As shown, the first two-way valve 20 and the fourth two-way valve 40 are closed, the third two-way valve 60 is opened, the second two-way valve 30 is still in a closed state, and the second timing starts; at this time, the airflow flows out from the volume tank 50, and flows to the product to be tested 80 through the fifth pipeline 41 and the third two-way valve 60 (wherein the bold line is the airflow path, i.e., the test loop, and the arrow is the airflow direction). When the second timing reaches the second preset time (recorded as the test time), the test data of the flow sensor 92 is recorded as the second data, and then the exhaust step is entered.

[0037] In the test step, the flow test gas source is provided through the volume tank 50, which can quickly stabilize the gas in the test loop and provide more reliable flow test parameters. The reason is that the volume tank 50 is filled with gas to a saturated state. When the volume tank 50 is used to supply the test flow in the test step, it can provide better stability for the flow. At the same time, because the test loop is not directly connected to the working gas source, the influence of pressure fluctuations at the working gas source can be effectively isolated, and the test data is more reliable and stable.

[0038] The reason for setting the test time is that there may be a certain error in the instantaneous flow value. Therefore, by obtaining the flow value per unit time within a period of time and comparing it with the preset related data, the test can be made more accurate. At the same time, according to the set test time, it is also convenient to make horizontal comparisons of all similar products.

[0039] S440, exhaust step: close the third two-way valve 60, open the second two-way valve 30, and the first two-way valve 20 is still in a closed state; at this time, the product to be tested 80 is connected to the exhaust port 32 via the third pipeline 21, the fourth pipeline 31 and the second two-way valve 30, and a second exhaust operation is performed; after completing the second exhaust operation, remove the product to be tested 80.

[0040] In the exhaust step, the exhaust time can be set. When the exhaust time is reached, the second exhaust operation is terminated and the product to be tested 80 is removed (at this time, it is actually a tested product). The exhaust step is set mainly to prevent the high-pressure product in the product to be tested 80 from being emptied and causing injuries when it is removed. A second preset pressure value can also be set for the exhaust step. When the exhaust time is reached and the test data of the pressure sensor 91 is less than the second preset pressure value, the second exhaust operation is terminated; the second preset pressure value can be a smaller value based on reaching a safety level.

[0041] During the exhaust step, the state of the fourth two-way valve 40 is not restricted and can be either an open state or a closed state. If the fourth two-way valve 40 is in a closed state during the exhaust step, the fourth two-way valve 40 is opened when returning to the initial state. If the fourth two-way valve 40 is in an open state during the exhaust step, it can directly return to the initial state.

[0042] It should be noted that: the gas circuit switching in the inflation stage and the test stage is independently controlled by a two-way valve. During the switching process, the inflation pipeline and the test pipeline are independently controlled. When the inflation step is switched to the test step, the first two-way valve 20 and the fourth two-way valve 40 can be closed first, and the gas is switched to the test step after it is stable, so as to reduce the gas shock during the switching process. If a two-position three-way valve is used, during the switching process from the inflation state to the test state, because a two-position three-way valve is used for control, the gas circuits of the inflation state and the test state may be connected during the switching process, so that the gas in the gas circuit in the test state will be shaken, which will prolong the stability of the test process and reduce the test efficiency.

[0043] In summary, the present invention performs actions such as inflation, testing, and exhaust through a two-way valve, a volume tank 50, a pressure sensor 91, a flow sensor 92, and related pipelines. In the inflation action, the gas is filled with a certain pressure of gas into the product to be tested 80 without passing through the flow sensor 92, so that the working pipeline is in a state where the flow is balanced and stable, and the flow sensor 92 is prevented from being in an over-range state when it starts working. During the test action, the third two-way valve 60 acts to test the flow of the gas in the pipeline through the flow sensor 92, and the timer accurately controls the time of reading the value, which is convenient for horizontal comparison of all products. After the test is completed, the second two-way valve 30 acts to discharge the gas in the product.

[0044] The above implementation modes are only preferred embodiments of the present invention and cannot be used to limit the scope of protection of the present invention. Any non-substantial changes and substitutions made by technicians in this field on the basis of the present invention shall fall within the scope of protection required by the present invention.

Claims

1. A flow test device that prevents range overshoot and gas source fluctuation interference, used to test the flow parameters of a product to be tested; characterized in that: It includes a working gas source, a first two-way valve, a second two-way valve, a third two-way valve, a fourth two-way valve, a volume tank, a pressure sensor and a flow sensor; wherein, the first interface of the first two-way valve is connected to the working gas source through a first pipeline, and the second interface of the first two-way valve is connected to the product to be tested through a third pipeline; the first interface of the second two-way valve is connected to the third pipeline through a fourth pipeline, and the second interface of the second two-way valve is connected to the exhaust port; the pressure sensor is connected to the third pipeline between the fourth pipeline and the product to be tested; the first interface of the fourth two-way valve is connected to the working gas source through a second pipeline, and the second interface of the fourth two-way valve is connected to the product to be tested through a fifth pipeline via the third two-way valve; the flow sensor is installed on the fifth pipeline; the volume tank is connected to the fifth pipeline between the fourth two-way valve and the flow sensor.

2. The flow testing device according to claim 1, characterized in that: The flow testing device that prevents range overshoot and resists gas source fluctuation interference also includes a connecting piece; one end of the connecting piece is connected to the product to be tested, and the other end of the connecting piece is connected to the second end of the third pipeline through the seventh pipeline, and the first end of the third pipeline is connected to the second interface of the first two-way valve; the pressure sensor is connected to the third pipeline between the fourth pipeline and the second end of the third pipeline; the first interface of the third two-way valve is connected to the second interface of the fourth two-way valve through the fifth pipeline, and the second interface of the fourth two-way valve is connected to between the seventh pipeline and the third pipeline through the sixth pipeline.

3. The flow testing device according to claim 2, characterized in that: The connecting piece is a switch valve and / or a quick connector; when the connecting piece is a quick connector and a switch valve, the switch valve is installed in the seventh pipeline, one end of the quick connector is connected to the first end of the seventh pipeline, and the product to be tested is connected to the other end of the quick connector.

4. The flow rate testing device according to any one of claims 1 to 3, characterized in that: The flow testing device that prevents range overshoot and gas source fluctuation interference also includes a controller, which receives test data from a flow sensor and a pressure sensor, and controls the opening or closing of the first two-way valve, the second two-way valve, the third two-way valve, and the fourth two-way valve.

5. A flow rate testing method for preventing range overshoot and resisting gas source fluctuation interference, characterized in that: The flow testing device according to any one of claims 1 to 4 is used to implement the flow parameter test of the product to be tested, which includes the following steps: Initial step: the first two-way valve, the second two-way valve, the third two-way valve and the fourth two-way valve are all in the initial state. In the initial state, the first two-way valve and the third two-way valve are in the closed state, and the fourth two-way valve and the second two-way valve are in the open state; at this time, the volume tank is connected to the working gas source through the second pipeline and the fourth two-way valve, and the volume tank is in the inflated state. At this time, the product to be tested is connected to the exhaust port via the third pipeline, the fourth pipeline and the second two-way valve, so that the product to be tested is connected to the outside atmosphere, and the first exhaust operation is performed; Inflating step: first close the second two-way valve, then open the first two-way valve, the third two-way valve is still in the closed state, the fourth two-way valve is still in the open state, and the first timing starts; at this time, the working gas source inflates the product to be tested through the first pipeline, the first two-way valve, and the third pipeline, and at the same time, the working gas source also inflates the volume tank through the second pipeline and the fourth two-way valve; when the first timing reaches the first preset time, the test data of the pressure sensor is recorded as the first data, and then the test step is entered; Test steps: close the first two-way valve and the fourth two-way valve, open the third two-way valve, the second two-way valve is still in the closed state, and start the second timing; at this time, the air flows out from the volume tank, flows to the product to be tested through the fifth pipeline and the third two-way valve; when the second timing reaches the second preset time, record the test data of the flow sensor as the second data, and then enter the exhaust step; Exhaust step: close the third two-way valve, open the second two-way valve, and the first two-way valve is still in the closed state; at this time, the product to be tested is connected to the exhaust port via the third pipeline, the fourth pipeline and the second two-way valve, and the second exhaust operation is performed; after the high-pressure gas in the product to be tested is exhausted to a safe level, remove the product to be tested.

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