Solenoid valve flow test method and test device

Abstract

The invention discloses an electromagnetic valve flow testing method and device, the testing method is based on the testing device, the testing device comprises a fixing mechanism, the fixing mechanism is provided with a mounting groove for inserting and fixing an electromagnetic valve to be tested, and the fixing mechanism is further provided with an air inlet channel and an air outlet channel; the air inlet channel corresponds to a pressure supply port of a to-be-tested electromagnetic valve to supply air to the to-be-tested electromagnetic valve, a through hole coaxial with the air inlet channel is formed in the air inlet channel, the air inlet channel is divided into a first air inlet section and a second air inlet section by the through hole, and the first air inlet section is located on the side, away from the to-be-tested electromagnetic valve, of the through hole; and gas at the exhaust port of the to-be-tested solenoid valve is exhausted from the gas outlet channel. The collecting mechanism is used for collecting a first pressure value in the first air inlet section, a second pressure value in the second air inlet section and a third pressure value in the air outlet channel. And calculating the flow of the to-be-measured solenoid valve according to the first pressure value, the second pressure value and the third pressure value. Only several pressure sensors are needed to measure the flow of the electromagnetic valve, so that the cost is saved.

Description

Technical Field

[0001] The present invention relates to the technical field of electromagnetic valve testing, and in particular to an electromagnetic valve flow testing method and testing device. Background Art

[0002] After the solenoid valve is processed, it needs to be tested for flow. When testing the flow of existing solenoid valves, flow meters are used for direct measurement. However, there are the following problems when directly using flow meters to measure the flow of solenoid valves:

[0003] 1. When using a flow meter to test the flow of a solenoid valve, the pressure supply stability is required to be high, and a precision servo proportional valve is required to stabilize the gas supply pressure. The solution of precision flow meter + precision servo proportional valve is costly;

[0004] 2. The accuracy of the precision flowmeter is positively correlated with the range. When measuring solenoid valves with different flow rates, it is usually necessary to replace flowmeters with different ranges.

[0005] 3. The test gas inevitably contains a small amount of water, oil and other tiny particles. These objects will have a small amount of precipitation and adhesion after passing through the flow meter, which will affect the measurement accuracy and life of the flow meter after long-term use.

[0006] The above shortcomings make the production cost of solenoid valves high and the product competitiveness low when using traditional flow meters for measurement. Both the initial purchase and subsequent maintenance require high costs.

[0007] Method content

[0008] In order to overcome the above shortcomings, the purpose of this method is to provide a solenoid valve flow test method and test device, which only requires a few pressure sensors to measure the flow of the solenoid valve and save costs.

[0009] In order to achieve the above purpose, the technical solution adopted by the method is: a solenoid valve flow test method, the test method is based on a test device, and the test device includes:

[0010] A fixing mechanism, wherein a mounting groove is provided on the fixing mechanism for inserting and fixing the electromagnetic valve to be tested, and the fixing mechanism is also provided with an air inlet channel and an air outlet channel, wherein the air inlet channel corresponds to the pressure supply port of the electromagnetic valve to be tested so as to supply air to the electromagnetic valve to be tested, and a through hole coaxial with the air inlet channel is provided in the air inlet channel, and the through hole divides the air inlet channel into a first air inlet section and a second air inlet section, wherein the first air inlet section is located on a side of the through hole away from the electromagnetic valve to be tested, and the gas at the exhaust port of the electromagnetic valve to be tested is discharged from the air outlet channel;

[0011] A collecting mechanism, the collecting mechanism is fixed to the fixing mechanism, the collecting mechanism comprises a first pressure sensor for collecting a first pressure value in the first air inlet section, a second pressure sensor for collecting a second pressure value in the second air inlet section, and a third pressure sensor for collecting a third pressure value in the air outlet channel;

[0012] The test method includes:

[0013] Fixing the solenoid valve to be tested on the fixing mechanism;

[0014] Providing a linearly varying direct current to the solenoid valve to be tested;

[0015] acquiring the first pressure value, the second pressure value and the third pressure value in real time;

[0016] The flow rate of the electromagnetic valve to be tested is calculated according to the first pressure value, the second pressure value and the third pressure value.

[0017] The beneficial effects of this method are: no flow meter is required, and the through hole and the pressure supply port are connected in series by opening relevant channels on the fixing device, measuring the pressure values ​​before and after the two sensing orifices, calculating the flow of the solenoid valve to be tested through the algorithm model, and completing the test of the solenoid valve to be tested. The test method has low requirements on the stability of the supply pressure, does not require the configuration of a precise servo proportional valve, and only requires a pressure sensor as a measuring element, which is low in cost; at the same time, it has strong applicability and can meet the test of solenoid valves to be tested with different flow rates at the same time, without the need to replace sensors with different ranges.

[0018] Specifically, the flow rate of the electromagnetic valve to be tested is calculated by using a pre-deployed algorithm model, and the algorithm model is:

[0019]

[0020] Where Q * is the flow rate of the electromagnetic valve to be tested, P1 is the first pressure value, P2 is the second pressure value, and P3 is the third pressure value.

[0021] The flow rate of the solenoid valve to be tested can be calculated through the pressure values ​​at three positions of one channel.

[0022] Furthermore, the acquisition mechanism further includes a fourth pressure sensor, and the fourth pressure sensor is used to acquire a fourth pressure value of a monitoring channel between the A cavity opening and the B cavity opening of the electromagnetic valve to be tested. The A cavity opening and the B cavity opening are inherent properties of the electromagnetic valve to be tested, and during measurement, the A cavity opening and the B cavity opening need to be connected.

[0023] When the fourth pressure value exceeds the set threshold, an alarm is triggered and detection is stopped. The abnormality of the electromagnetic valve to be tested can be discovered in time through the first pressure value.

[0024] The present invention also discloses a solenoid valve flow rate testing device, the testing device comprising:

[0025] A fixing mechanism, wherein a mounting groove is provided on the fixing mechanism for inserting and fixing the electromagnetic valve to be tested, and the fixing mechanism is also provided with an air inlet channel and an air outlet channel, wherein the air inlet channel corresponds to the pressure supply port of the electromagnetic valve to be tested so as to supply air to the electromagnetic valve to be tested, and a through hole coaxial with the air inlet channel is provided in the air inlet channel, and the through hole divides the air inlet channel into a first air inlet section and a second air inlet section, wherein the first air inlet section is located on a side of the through hole away from the electromagnetic valve to be tested, and the gas at the exhaust port of the electromagnetic valve to be tested is discharged from the air outlet channel;

[0026] A collecting mechanism, the collecting mechanism is fixed to the fixing mechanism, the collecting mechanism comprises a first pressure sensor for collecting a first pressure value in the first air inlet section, a second pressure sensor for collecting a second pressure value in the second air inlet section, and a third pressure sensor for collecting a third pressure value in the air outlet channel;

[0027] A controller, wherein the controller controls the electric quantity of the electromagnetic valve to be tested and collects the first pressure value, the second pressure value and the third pressure value in real time. The controller has a built-in algorithm model, and the algorithm model calculates the flow of the electromagnetic valve to be tested in real time through the first pressure value, the second pressure value and the third pressure value.

[0028] No flow meter is required. By opening relevant channels on the fixture, the through hole and the pressure supply port are connected in series, the pressure values ​​before and after the two sensing orifices are measured, and the flow rate of the solenoid valve to be tested is calculated through the algorithm model to complete the test of the solenoid valve to be tested. At this time, the supply pressure stability requirements are relatively low, and there is no need to configure a precise servo proportional valve. Only a pressure sensor is required as a measuring element, which is low in cost; at the same time, it has strong applicability and can meet the test of solenoid valves to be tested with different flow rates at the same time, without the need to replace sensors with different ranges.

[0029] Specifically, the through hole and the pressure supply port of the solenoid valve to be tested have the same diameter, and the first air inlet section and the second air inlet section have the same diameter, both of which are greater than 2 times the diameter of the through hole. In this case, the through hole and the pressure supply port form two identical serial ports, and the size of the air inlet passage will not affect the pressure passing through the through hole.

[0030] Furthermore, the solenoid valve to be tested also includes an A cavity opening and a B cavity opening, the fixing mechanism also includes a monitoring channel that is simultaneously connected to the A cavity opening and the B cavity opening, and the acquisition mechanism also includes a fourth pressure sensor for detecting a fourth pressure value in the monitoring channel.

[0031] Furthermore, the through hole is opened on a gasket fixed in the air intake passage, and a separator ring and a spoiler are provided on the side of the gasket close to the second air intake section. The separator ring is provided with an air hole with a diameter larger than the through hole, and the spoiler is used to disperse the air blown out of the through hole to all sides.

[0032] After passing through the through hole, the gas is concentrated in the middle area. By arranging the spoiler, the airflow in the middle area is dispersed to make the gas in the second air intake section uniform.

[0033] Furthermore, the spoiler includes a blocking portion, and the blocking portion extends outwardly to have a plurality of partitions evenly distributed along the circumferential direction, and air holes are formed between adjacent partitions. Most of the gas coming out of the through hole blows onto the blocking portion, and then disperses to the surroundings in the separation ring, and enters the second air inlet section from the air hole, thereby realizing the turbulence of the gas.

[0034] Furthermore, the fixing mechanism includes a first mounting block, a second mounting block, a third mounting block and a fourth mounting block which are sequentially arranged in a first direction, and the first mounting block, the second mounting block, the third mounting block and the fourth mounting block are detachably connected.

[0035] The fixing mechanism adopts a split structure, which is convenient for processing and assembly, and is easy to replace when a single pressure sensor or channel is abnormal.

[0036] The first pressure sensor, the second pressure sensor, the third pressure sensor and the fourth pressure sensor are respectively fixed on the first mounting block, the second mounting block, the third mounting block and the fourth mounting block, and the mounting groove is arranged on the third mounting block.

[0037] Further, the gasket with the through hole is clamped between the first mounting block and the second mounting block, the first mounting block is provided with a first air inlet section, the second mounting block and the third mounting block jointly form a second air inlet section, the air outlet channel is provided on the third mounting block, and the third mounting block and the fourth mounting block jointly form the monitoring channel. BRIEF DESCRIPTION OF THE DRAWINGS

[0038] Figure 1 This is a schematic diagram of the three-dimensional structure of the testing device in Example 1 of the present method;

[0039] Figure 2 is a cross-sectional view of the test device in Embodiment 1 of the present method;

[0040] Figure 3 for Figure 2 Middle A enlarged view;

[0041] Figure 4Schematic diagram of the structure of the gasket, the separation ring and the spoiler in the first embodiment of the present invention;

[0042] Figure 5 This is a schematic diagram of the test principle in the first embodiment of the present invention;

[0043] Figure 6 This is a test flow chart in Embodiment 2 of the present invention.

[0044] In the figure:

[0045] 100. Solenoid valve to be tested;

[0046] 11. first mounting block; 12. second mounting block; 13. third mounting block; 131. mounting groove; 14. fourth mounting block;

[0047] 21. First pressure sensor; 22. Second pressure sensor; 23. Third pressure sensor; 24. Fourth pressure sensor;

[0048] 31. air inlet channel; 311. first air inlet section; 312. second air inlet section; 32. air outlet channel; 33. monitoring channel;

[0049] 41. Gasket; 411. Through hole; 42. Separation ring; 421. Vent hole; 43. Spoiler; 431. Blocking part; 432. Separation part; 433. Vent hole. DETAILED DESCRIPTION

[0050] The preferred embodiments of the present method are described in detail below in conjunction with the accompanying drawings so that the advantages and features of the present method can be more easily understood by those skilled in the art, thereby making a clearer and more definite definition of the protection scope of the present method.

[0051] Embodiment 1

[0052] A solenoid valve flow test device, see attached Figure 1 and attached Figure 2 As shown, it includes a fixing mechanism, and a mounting groove 131 is provided on the fixing mechanism for inserting and fixing the electromagnetic valve 100 to be tested. When the electromagnetic valve 100 to be tested is tested, it is sealed and plugged into the mounting groove 131. The electromagnetic valve includes a pressure supply port and an exhaust port. When the electromagnetic valve is tested, gas needs to be filled from the pressure supply port of the electromagnetic valve. When the electromagnetic valve is opened, the gas flows out from the exhaust port.

[0053] The fixing mechanism is also provided with an air inlet channel 31 and an air outlet channel 32. The air inlet channel 31 is communicated with the mounting groove 131, and one end of the air inlet channel 31 is connected to the pressure supply port of the electromagnetic valve 100 to be tested, and the other end penetrates the fixing mechanism to form an air inlet. The electromagnetic valve 100 to be tested is supplied with air through the air inlet channel 31 for testing. The air outlet channel 32 is also communicated with the mounting groove 131, and the gas blown out of the exhaust port flows out from the air outlet channel 32, and the air outlet channel 32 penetrates the fixing mechanism to form an air outlet.

[0054] The air intake channel 31 includes a through hole 411 coaxial therewith, which is smaller than the diameter of the air intake channel 31. The through hole 411 divides the air intake channel 31 into a first air intake section 311 and a second air intake section 312, wherein the first air intake section 311 is located on a side of the through hole 411 close to the air inlet.

[0055] The testing device also includes a collecting mechanism, which is fixed to the fixing mechanism. The collecting mechanism includes a first pressure sensor 21, a second pressure sensor 22 and a third pressure sensor 23. The first pressure sensor 21 is used to collect a first pressure value in the first air intake section 311, and the first pressure value is the pressure value before the through hole 411. The second sensor is used to collect a second pressure value in the second air intake section 312, and the second pressure value is the pressure value after the through hole 411 and before the solenoid valve 100 to be tested. The third sensor is used to collect a third pressure value in the air outlet channel 32, and the third pressure value is the pressure after the solenoid valve 100 to be tested.

[0056] The testing device also includes a controller, which controls the power of the electric valve to be tested and collects the first pressure value, the second pressure value and the third pressure value collected by the collection mechanism in real time. The controller has a built-in algorithm model, and the algorithm model calculates the flow rate of the solenoid valve 100 to be tested in real time through the first pressure value, the second pressure value and the third pressure value.

[0057] The test device in this embodiment does not require a flow meter. By opening a relevant channel on the fixing device, the through hole 411 and the pressure supply port are connected in series, the pressure values ​​before and after the two sensing ports are measured, and the flow rate of the electromagnetic valve 100 to be tested is calculated through the algorithm model to complete the test of the electromagnetic valve 100 to be tested. The test device in this embodiment has low requirements for the stability of the supply pressure, does not need to be configured with a precise servo proportional valve, and only requires a pressure sensor as a measuring element, which is low in cost; at the same time, it has strong applicability and can simultaneously meet the test of the electromagnetic valve 100 to be tested with different flow rates, without the need to replace sensors with different ranges.

[0058] The through hole 411 and the pressure supply port have matching sizes, and the through hole 411 and the pressure supply port have the same diameter. In this embodiment, the diameter of the through hole 411 is 2 mm. The diameters of the first air inlet section 311 and the second air inlet section 312 are the same, both of which are greater than twice the diameter of the through hole 411. At this time, the through hole 411 and the pressure supply port form two identical serial ports, and the size of the air inlet channel 31 will not affect the pressure passing through the through hole 411.

[0059] The algorithm model is

[0060] Wherein Q* is the flow rate of the electromagnetic valve 100 to be tested, P1 is the first pressure value, P2 is the second pressure value, and P3 is the third pressure value.

[0061] The pressures at different positions are collected in real time by three pressure sensors, and the flow rate of the electromagnetic valve 100 to be tested can be directly calculated by a preset algorithm model.

[0062] The algorithm model is based on fluid mechanics theory. For a single orifice, the flow calculation formula is as follows:

[0063]

[0064] Where α is the flow coefficient, A is the area of ​​the orifice, ρ is the density, and ΔP is the orifice pressure difference.

[0065] If two orifices are connected in series, that is, the through hole 411 and the pressure supply port in this embodiment are connected in series, the flow rate Q1 at the through hole 411 and the flow rate Q2 at the pressure supply port should satisfy Q1 = Q2. The mass flow rate through the orifice is: m = Q*ρ.

[0066] So the average density formula is

[0067] P is the absolute pressure, R is the ideal gas constant, and T is the temperature.

[0068] The mass flow rate through a single orifice is:

[0069] Substituting the average density formula (1) into formula (2) yields:

[0070]

[0071] So for the attachment Figure 5 For the two orifices (through hole 411 and pressure supply port) connected in series as shown

[0072]

[0073] Therefore the flow rate of two orifices connected in series is:

[0074]

[0075] Through the above reasoning, it can be known how to obtain flow through two series-connected orifices. The test device in the present application adopts this method, connecting the through hole 411 and the pressure supply port in series to obtain an algorithm model, which is used to obtain the real-time pressure of the solenoid valve through pressure calculation and perform flow test on the solenoid valve.

[0076] The solenoid valve 100 to be tested further includes an A cavity opening and a B cavity opening, the fixing mechanism further includes a monitoring channel 33 which is simultaneously connected to the A cavity opening and the B cavity opening, and the collecting mechanism further includes a fourth pressure sensor 24 which is used to detect a fourth pressure value in the monitoring channel 33 .

[0077] The controller is used to obtain the fourth pressure value in real time and compare the fourth pressure value with the set threshold value. When the fourth pressure value is greater than the set threshold value, an alarm is issued and the detection is stopped. Although the fourth pressure value does not participate in the calculation of the flow rate, the fourth pressure sensor 24 can be used to detect abnormalities of the electromagnetic valve 100 to be tested. The A cavity opening and the B cavity opening are inherent properties of the electromagnetic valve 100 to be tested, and during measurement, the A cavity opening and the B cavity opening need to be connected.

[0078] At this time, through four pressure sensors, the flow of the solenoid valve 100 to be tested can be calculated in real time, and the abnormality of the solenoid valve 100 to be tested can be monitored. There is no need to use expensive and precise flow meters, which eliminates subsequent maintenance costs and measurement inaccuracies, reduces the company's production costs, and thus improves product competitiveness.

[0079] See attached Figure 1 and attached Figure 2 As shown, the fixing mechanism includes a first mounting block 11, a second mounting block 12, a third mounting block 13 and a fourth mounting block 14 which are sequentially arranged along the first direction (X axis), and the four mounting blocks are fixedly connected by locking members (such as bolts). A mounting groove 131 is provided on the third mounting block 13, and the mounting groove 131 extends along the second direction (Y axis). The electromagnetic valve 100 to be tested and the third mounting block 13 are detachably connected. When the test of one electromagnetic valve 100 to be tested is completed, the next electromagnetic valve 100 to be tested is fixed on the third mounting block 13.

[0080] See attached Figure 3 and attached Figure 4 As shown, a gasket 41 is fixed between the first mounting block 11 and the second mounting block 12, and the gasket 41 is clamped and confined between the first mounting block 11 and the second mounting block 12. A through hole 411 is opened on the gasket 41, the first air intake section 311 is arranged on the first mounting block 11 and distributed along the first direction, and the first pressure sensor 21 is fixed on the first mounting block 11.

[0081] Channel 1 and channel 2 which are coaxial with the first air intake section 311 and have the same size as the first air intake section 311 are formed on the second mounting block 12 and the third mounting block 13 respectively. Channel 1 and channel 2 are distributed along the first direction and together form the second air intake section 312. The second pressure sensor 22 is fixed on the second mounting block 12.

[0082] The air outlet channel 32 is provided on the third mounting block 13, and the air outlet channel 32 is perpendicular to the mounting groove 131, and the third pressure sensor 23 is fixed on the third mounting block 13. A threaded hole is provided on the third mounting block 13, and after the solenoid valve 100 to be tested is inserted into the mounting groove 131, the solenoid valve 100 to be tested is fixed by a bolt threadedly connected to the threaded hole.

[0083] The third mounting block 13 and the fourth mounting block 14 jointly form a monitoring channel 33 , the monitoring channel 33 is in communication with the mounting groove 131 , and the fourth pressure sensor 24 is fixed on the fourth mounting block 14 .

[0084] The fixing mechanism in this embodiment adopts a split structure, which is easy to process and assemble, and is easy to replace when a single pressure sensor or channel is abnormal. At the same time, the gasket 41 can be replaced according to the electromagnetic valve 100 to be tested, that is, the size of the through hole 411 can be changed.

[0085] In one embodiment, a separation ring 42 and a spoiler 43 are further provided on one side of the gasket 41 close to the second air intake section 312. The separation ring 42 is located between the spoiler 43 and the gasket 41. The separation ring 42 is used to separate the spoiler 43 and the gasket 41 to provide space for subsequent gas disturbance. A vent 421 is provided on the separation ring 42. The vent 421 is coaxial with the through hole 411 and has a diameter larger than the through hole 411. The spoiler 43 is used to make the gas entering the second air intake section 312 more uniform, because after passing through the through hole 411, the gas is concentrated in the middle area. By providing the spoiler 43, the air flow in the middle area is dispersed to make the gas in the second air intake section 312 uniform.

[0086] See attached Figure 4 As shown, the spoiler 43 includes a blocking portion 431, and the blocking portion 431 extends outward to have a plurality of partitions 432 evenly distributed along the circumferential direction, and air holes 433 are formed between adjacent partitions 432. Most of the gas coming out of the through hole 411 is blown onto the blocking portion 431, and then dispersed to the surroundings in the separation ring, and enters the second air inlet section 312 from the air holes 433, thereby realizing the turbulence of the gas.

[0087] When the spoiler 43 is processed, a circular plate with the same outer diameter as the separation ring 42 is selected, and the circular plate has multiple grooves evenly distributed along the circumference, and the inner side is the side facing the center of the circular plate structure. The groove is the air hole 433, and the middle area of ​​the circular plate is the blocking part 431.

[0088] Embodiment 2

[0089] A solenoid valve flow test method, using the test device in embodiment 1, see attached Figure 6 As shown, the following steps are included:

[0090] S1. Fix the solenoid valve 100 to be tested on a fixing mechanism.

[0091] After the electromagnetic valve 100 to be tested is fixed on the fixing mechanism, the through hole 411 and the pressure supply port of the electromagnetic valve 100 to be tested are connected in series on an air flow channel.

[0092] S2. Provide a linearly varying direct current to the solenoid valve 100 to be tested.

[0093] The linearly changing direct current is 0A-1A-0A-1A, and so on, that is, 0A and 1A are supplied alternately.

[0094] S3. Acquire the first pressure value, the second pressure value, and the third pressure value in real time.

[0095] The first pressure value is the pressure value before the through hole 411 , the second pressure value is the pressure value after the through hole 411 and before the electromagnetic valve 100 to be tested, and the third pressure value is the pressure after the electromagnetic valve 100 to be tested.

[0096] S4. Calculate the flow rate of the electromagnetic valve 100 to be tested according to the first pressure value, the second pressure value and the third pressure value.

[0097] When calculating in step S4, the calculation is performed using the pre-deployed algorithm model, which is

[0098] Where Q * is the flow rate of the electromagnetic valve 100 to be tested, P1 is the first pressure value, P2 is the second pressure value, and P3 is the third pressure value.

[0099] The solenoid valve flow test method also includes real-time collection of a fourth pressure value, where the fourth pressure value is the pressure value of the monitoring channel 33 between the A cavity opening and the B cavity opening of the solenoid valve 100 to be tested. When the fourth pressure value exceeds a set threshold, an alarm is triggered and detection is stopped.

[0100] In one embodiment, the controller includes a control unit and a computing unit. The control unit is used to send a signal for supplying power to the electromagnetic valve 100 to be tested, and the computing unit stores an algorithm model.

[0101] The test method in this embodiment has low requirements on the stability of the supply pressure, does not require the configuration of a precise servo proportional valve, and only requires four pressure sensors as measuring elements, which is low in cost. The test method is highly applicable and can simultaneously meet the test of solenoid valves with different flow rates without the need to replace sensors with different ranges.

[0102] Embodiment 3

[0103] The present invention further discloses a computer-readable storage medium, on which a computer program is stored. When the computer program is executed by a processor, the steps of the testing method of the second embodiment are implemented.

[0104] Based on such understanding, the present invention implements all or part of the processes in the above-mentioned embodiment method, and can also be completed by instructing related hardware through a computer program, and the computer program can be stored in a computer-readable storage medium, and the computer program can implement the steps of each of the above-mentioned method embodiments when executed by a processor. Among them, the computer program includes computer program code, and the computer program code can be in source code form, object code form, executable file or some intermediate form. The computer-readable medium may include: any entity or device capable of carrying the computer program code, recording medium, U disk, mobile hard disk, disk, optical disk, computer memory, read-only memory (ROM, Read-Only Memory), random access memory (RAM, Random Access Memory), electrical carrier signal, telecommunication signal and software distribution medium, etc.

[0105] The above implementation methods are only for illustrating the technical concept and features of the present method. The purpose is to allow people familiar with this technology to understand the content of the present method and implement it. It cannot be used to limit the protection scope of the present method. Any equivalent changes or modifications made according to the spirit of the present method should be included in the protection scope of the present method.

Claims

1. A solenoid valve flow rate testing method, characterized in that: The test method is based on a test device, which includes: A fixing mechanism, wherein a mounting groove is provided on the fixing mechanism for inserting and fixing the electromagnetic valve to be tested, and the fixing mechanism is also provided with an air inlet channel and an air outlet channel, wherein the air inlet channel corresponds to the pressure supply port of the electromagnetic valve to be tested so as to supply air to the electromagnetic valve to be tested, and a through hole coaxial with the air inlet channel is provided in the air inlet channel, and the through hole divides the air inlet channel into a first air inlet section and a second air inlet section, wherein the first air inlet section is located on a side of the through hole away from the electromagnetic valve to be tested, and the gas at the exhaust port of the electromagnetic valve to be tested is discharged from the air outlet channel; A collecting mechanism, the collecting mechanism is fixed to the fixing mechanism, the collecting mechanism comprises a first pressure sensor for collecting a first pressure value in the first air inlet section, a second pressure sensor for collecting a second pressure value in the second air inlet section, and a third pressure sensor for collecting a third pressure value in the air outlet channel; The test method includes: Fixing the solenoid valve to be tested on the fixing mechanism; Providing a linearly varying direct current to the solenoid valve to be tested; acquiring the first pressure value, the second pressure value and the third pressure value in real time; The flow rate of the electromagnetic valve to be tested is calculated according to the first pressure value, the second pressure value and the third pressure value.

2. The solenoid valve flow rate testing method according to claim 1, characterized in that: The flow rate of the solenoid valve to be tested is calculated by using a pre-deployed algorithm model, and the algorithm model is: Where Q * is the flow rate of the electromagnetic valve to be tested, P1 is the first pressure value, P2 is the second pressure value, and P3 is the third pressure value.

3. The solenoid valve flow rate testing method according to claim 1, characterized in that: The acquisition mechanism further includes a fourth pressure sensor, and the fourth pressure sensor is used to acquire a fourth pressure value of a monitoring channel between the A cavity opening and the B cavity opening of the solenoid valve to be tested; When the fourth pressure value exceeds the set threshold, an alarm is triggered and detection is stopped.

4. A solenoid valve flow test device, characterized in that: The testing device comprises: A fixing mechanism, wherein a mounting groove is provided on the fixing mechanism for inserting and fixing the electromagnetic valve to be tested, and the fixing mechanism is also provided with an air inlet channel and an air outlet channel, wherein the air inlet channel corresponds to the pressure supply port of the electromagnetic valve to be tested so as to supply air to the electromagnetic valve to be tested, and a through hole coaxial with the air inlet channel is provided in the air inlet channel, and the through hole divides the air inlet channel into a first air inlet section and a second air inlet section, wherein the first air inlet section is located on a side of the through hole away from the electromagnetic valve to be tested, and the gas at the exhaust port of the electromagnetic valve to be tested is discharged from the air outlet channel; A collecting mechanism, the collecting mechanism is fixed to the fixing mechanism, the collecting mechanism comprises a first pressure sensor for collecting a first pressure value in the first air inlet section, a second pressure sensor for collecting a second pressure value in the second air inlet section, and a third pressure sensor for collecting a third pressure value in the air outlet channel; A controller, wherein the controller controls the electric quantity of the electromagnetic valve to be tested and collects the first pressure value, the second pressure value and the third pressure value in real time. The controller has a built-in algorithm model, and the algorithm model calculates the flow of the electromagnetic valve to be tested in real time through the first pressure value, the second pressure value and the third pressure value.

5. The solenoid valve flow rate testing device according to claim 4, characterized in that: The through hole and the pressure supply port of the solenoid valve to be tested have the same diameter, and the first air intake section and the second air intake section have the same diameter, both of which are greater than twice the diameter of the through hole.

6. The solenoid valve flow rate testing device according to claim 5, characterized in that: The solenoid valve to be tested also includes an A cavity opening and a B cavity opening, the fixing mechanism also includes a monitoring channel that is simultaneously connected to the A cavity opening and the B cavity opening, and the acquisition mechanism also includes a fourth pressure sensor for detecting a fourth pressure value in the monitoring channel.

7. The solenoid valve flow rate testing device according to claim 5, characterized in that: The through hole is formed on a gasket fixed in the air intake passage. A separation ring and a spoiler are provided on the side of the gasket close to the second air intake section. The separation ring is provided with an air hole having a diameter larger than the through hole. The spoiler is used to disperse the air blown out of the through hole to all sides.

8. The solenoid valve flow rate testing device according to claim 7, characterized in that: The spoiler comprises a blocking portion, and a plurality of partitions evenly distributed along the circumferential direction extend outward from the blocking portion, and air holes are formed between adjacent partitions.

9. The solenoid valve flow rate testing device according to claim 6, characterized in that: The fixing mechanism comprises a first mounting block, a second mounting block, a third mounting block and a fourth mounting block arranged in sequence in a first direction, and the first mounting block, the second mounting block, the third mounting block and the fourth mounting block are detachably connected; The first pressure sensor, the second pressure sensor, the third pressure sensor and the fourth pressure sensor are respectively fixed on the first mounting block, the second mounting block, the third mounting block and the fourth mounting block, and the mounting groove is arranged on the third mounting block.

10. The solenoid valve flow rate testing device according to claim 9, characterized in that: The gasket with the through hole is clamped between the first mounting block and the second mounting block, the first mounting block is provided with a first air inlet section, the second mounting block and the third mounting block jointly form a second air inlet section, the air outlet channel is provided on the third mounting block, and the third mounting block and the fourth mounting block jointly form the monitoring channel.

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