Valve element response speed detection device of electromagnetic valve

Abstract

The valve element response speed detection device is used for detecting the response speed of a valve element, the valve element comprises a first valve block, a second valve block and a first elastic piece, and the first valve block and the second valve block are connected through the first elastic piece; the valve element has a first state in which the first elastic piece is in a compressed state and a second state in which the first elastic piece is in a natural state, the valve element response speed detection device of the electromagnetic valve comprises a fixing device, a pressure release device and a speed measuring device, the fixing device fixes the first valve block, and the pressure release device comprises an ejection device and an ejector rod; the ejector rod abuts against the second valve block and enables the valve element to be in a first state, the ejection device drives the ejector rod to eject and be separated from the second valve block, the ejection speed of the ejector rod driven by the ejection device is larger than the springback speed of the first elastic piece, and the speed measuring device measures the moving speed of the second valve block after the ejector rod and the second valve block are separated. According to the invention, the actual working condition after the valve core is assembled is simulated, and the test result accurately reflects the actual response speed of the valve core.

Description

Technical Field

[0001] The present application relates to the technical field of detection devices, and in particular, to a detection device for the response speed of a spool of a solenoid valve. Background Art

[0002] In an automotive engine system, the tuning control of intake and exhaust directly affects the performance of the engine. The opening and closing of the engine intake and exhaust depend on the rotation of the camshaft, and the rotation and phase adjustment of the camshaft depend on the tuning and response rate of the flow control valve.

[0003] Therefore, the response speed of the flow control valve is crucial for the engine performance. When developing and designing the camshaft flow valve, it is particularly important to accurately evaluate its response speed.

[0004] Currently, for the detection of the response speed of the flow control valve, most of them evaluate the rebound time by measuring the stiffness of the internal spring of the flow valve. This evaluation method only reflects the performance of the spring itself, and does not consider the influence caused by the cooperation between the spring and the spool components and the friction of the moving parts inside the valve body after the spring is assembled into the valve body. Therefore, the result of this test only reflects the performance of the spring itself, and cannot accurately evaluate the response speed of the spool, which will lead to a large deviation between the test result and the actual situation and cannot accurately reflect the response speed of the flow control valve.

[0005] Therefore, there is an urgent need for a test tooling that can accurately evaluate the response speed of the flow spool to meet the need for accurate evaluation of the spool. Summary of the Invention

[0006] Aiming at the deficiencies of the prior art, the purpose of the present application is to provide a detection device for the response speed of a spool of a solenoid valve, which can more accurately evaluate the response speed of the spool.

[0007] The above object of the present application is achieved by the following technical solutions:

[0008] A detection device for the response speed of the spool of a solenoid valve, which is used to detect the response speed of the spool. The spool includes a first valve block, a second valve block and a first elastic member. The first valve block and the second valve block are connected by the first elastic member. The spool has a first state when the first elastic member is in a compressed state and a second state when the first elastic member is in a natural state. Among them, the detection device for the response speed of the spool of the solenoid valve includes a fixing device, a pressing and releasing device and a speed measuring device. The fixing device fixes the first valve block. The pressing and releasing device includes an ejection device and a push rod. The push rod abuts against the second valve block and makes the spool in the first state. The ejection device drives the push rod to eject and separate from the second valve block. The speed at which the ejection device drives the push rod to eject is greater than the rebound speed of the first elastic member. The speed measuring device measures the speed at which the second valve block moves after the push rod and the second valve block are separated.

[0009] Adopting the above technical solution, by using the push rod to press against the second valve block to make the spool in the first state, the actual working condition is simulated. The speed measuring device is used to measure the movement speed of the spool after the pressure is released, which directly reflects the response speed of the spool, avoiding the limitation of only relying on the spring performance to evaluate the response speed, and the test result is closer to the actual situation.

[0010] The present application is further provided that the ejection device includes a second elastic member and a limiting plate. The limiting plate is connected to the fixing device. The limiting plate is arranged between the second elastic member and the spool. One end of the push rod abuts against the second valve block, one end of the second elastic member abuts against the limiting plate, and the other end of the second elastic member abuts against the other end of the push rod.

[0011] Adopting the above technical solution, the elastic force of the second elastic member is released on the push rod and the limiting plate, and the influence on the spool is small, so as to more accurately simulate the response rate of the spool under the actual working condition and improve the accuracy of the test result.

[0012] The present application is further provided that a through hole is opened on the limiting plate. The push rod penetrates through the through hole. The axis of the through hole and the acting line of the elastic force of the first elastic member are parallel to each other.

[0013] Adopting the above technical solution, the design that the through hole is parallel to the acting line of the elastic force of the first elastic member can ensure that the push rod always maintains the correct movement direction during the ejection process, improve the stability of the structure, and avoid the test error caused by the deviation of the movement direction.

[0014] The present application is further provided that the other end of the push rod has an end with a larger size, and the other end of the second elastic member abuts against the end.

[0015] With the above technical solution, the size of the end of the ejector rod is increased, providing a larger supporting area for the second elastic member, effectively enhancing the supporting force of the second elastic member, enabling it to more stably withstand the impact force generated during the ejection process.

[0016] The present application is further configured such that the pressure release device further includes a locking pin, the locking pin is rotatably connected to the fixing device, a locking buckle is provided on the ejector rod, and the locking pin and the locking buckle cooperate with each other.

[0017] With the above technical solution, the cooperation structure of the locking pin and the locking buckle can effectively lock the ejector rod, prevent the ejector rod from accidentally ejecting before testing, improve the safety and controllability of the ejection device, avoid the occurrence of accidental accidents, and the locking and release of the ejector rod can be conveniently achieved by rotating the locking pin, enhancing the reliability of the device.

[0018] The present application is further configured such that the locking pin is provided between the valve core and the second elastic member.

[0019] With the above technical solution, the locking pin is provided between the valve core and the second elastic member, effectively fixing the relative position between the valve core and the second elastic member, avoiding dislocation or loosening during the ejection process, and increasing the stability of the ejector rod.

[0020] The present application is further configured such that the fixing device includes a first fixing portion and a second fixing portion arranged oppositely, the first fixing portion and the second fixing portion enclose a chamber, the valve core is provided in the chamber, the first valve block is connected to the first fixing portion, and the locking pin and the limiting plate are both installed on the second fixing portion.

[0021] With the above technical solution, the chamber formed by the first fixing portion and the second fixing portion enclosing each other simulates the actual working scenario of the valve core. The design method of the first fixing portion and the second fixing portion being buckled to each other is convenient for assembly and disassembly, and convenient for replacing the valve core for detection.

[0022] The present application is further configured such that the speed measuring device includes a laser displacement sensor, a hole for the laser transceiver device of the laser displacement sensor is provided on the second fixing portion, and the hole is opposite to the second valve block.

[0023] With the above technical solution, the laser displacement sensor detects the position change of the second valve block by emitting and receiving laser light, and the hole is the path for the laser to enter the cavity.

[0024] The present application is further configured such that the first elastic member and the second elastic member are both springs, the acting lines of the elastic forces of the first elastic member and the second elastic member are both straight lines extending horizontally, and the elastic force of the second elastic member is greater than the elastic force of the first elastic member.

[0025] By adopting the above technical solution, a spring is used as an elastic part, which has a simple structure and is easy to manufacture and assemble. It can also effectively avoid the risk of failure caused by other complex elastic parts and improve the reliability of the ejection device. The elastic force action line of the spring is a horizontally extending straight line, which can ensure that the ejection force acts stably on the valve core and effectively avoid deviation in the direction of the ejection force, thereby improving the ejection accuracy.

[0026] The present application is further configured that the valve core response speed detection device of the solenoid valve also includes a tooling base, the fixing device and the speed measuring device are both installed on the tooling base, and the first valve block and the fixing device are threadedly matched.

[0027] By adopting the above technical solution, the tooling base provides a unified installation platform, integrating the fixing device and the speed measuring device, simplifying the installation process and improving the installation efficiency.

[0028] In summary, the beneficial technical effects of this application are:

[0029] 1. This application simulates the actual working conditions after the valve core is assembled and detects the response speed of the valve core, avoiding the limitation of relying solely on spring performance to evaluate the response speed. The test results are closer to the actual situation and can more accurately reflect the true response speed of the valve core.

[0030] 2. The valve core response speed detection device of the solenoid valve of the present application has a simple structure, low cost, and a simple and easy testing method. Through the combination of a fixing device, a pressure release device, and a speed measuring device, the testing process is simple, easy to operate, easy to implement, and has a high testing efficiency.

[0031] 3. The present application controls the ejection device to drive the ejection speed of the ejector rod to be greater than the rebound speed of the first elastic member, thereby making the test result more accurate and reliable, avoiding the interference of the ejector rod on the valve core when releasing the valve core, and reducing the impact on the test result. BRIEF DESCRIPTION OF THE DRAWINGS

[0032] Figure 1 It is a cross-sectional view of the valve core along its axis.

[0033] Figure 2 It is a front view of a valve core response speed detection device of a solenoid valve.

[0034] Figure 3 It is a top view of a valve core response speed detection device of a solenoid valve.

[0035] Figure 4 It is a cross-sectional view obtained by horizontally cutting the fixing device and the pressure release device along the axis of the valve core and observing upward.

[0036] Figure 5 It is a side view of the fixing device and the pressure release device.

[0037] Explanation of the accompanying drawings: A, valve core; A1, first valve block; A2, second valve block; A3, first elastic member; 1, fixing device; 11, first fixing part; 12, second fixing part; 121, hole; 2, pressure release device; 21, ejection device; 211, second elastic member; 212, limit plate; 213, locking pin; 213a, locking plate; 213b, rotating shaft; 213c, rotating handle; 213d, hook-shaped part; 22, push rod; 221, end; 222, lock buckle; 3, speed measuring device; 4, tooling base; 41, L-shaped bracket. DETAILED DESCRIPTION

[0038] The present application is further described in detail below in conjunction with the accompanying drawings.

[0039] like Figure 1 As shown, the structure of the valve core A is shown. The valve core A includes a first valve block A1, a second valve block A2 and a first elastic member A3. The first valve block A1 and the second valve block A2 are connected by the first elastic member A3. The valve core A changes its working state through the expansion and contraction of the first elastic member A3. The valve core A has a first state in which the first elastic member A3 is in a compressed state and a second state in which the first elastic member A3 is in a natural state.

[0040] like Figures 2 to 5 As shown, a valve core response speed detection device of a solenoid valve is used to detect the reaction speed of a valve core A. The valve core response speed detection device of the solenoid valve includes a fixing device 1, a pressure release device 2 and a speed measuring device 3. The fixing device 1 is used to fix the first valve block A1, and the pressure release device 2 is used to apply pressure to the second valve block A2 to put the valve core A in a first state. After the pressure release device 2 is released, the first elastic member A3 rebounds naturally, driving the valve core A to return to the second state, and the second valve block A2 changes position. The speed measuring device 3 is used to detect the position change of the second valve block A2, and then the response rate of the valve core A can be known.

[0041] See also Figure 4 Further, the pressure release device 2 includes an ejection device 21 and a push rod 22, the push rod 22 is used to resist the second valve block A2, and the ejection device 21 is used to eject the push rod 22, disconnect the contact between the push rod 22 and the second valve block A2, and make the second valve block A2 naturally return to the second state.

[0042] It is worth noting that the speed at which the ejection device 21 drives the top rod 22 to eject should be greater than the rebound speed of the first elastic member A3, so as not to affect the rebound of the first elastic member A3; and, the speed at which the ejection device 21 drives the top rod 22 to eject refers to the speed at which the top rod 22 moves, which is specifically the speed in the same direction as the line of action of the elastic force of the first elastic member A3.

[0043] The above structure is simple, the detection method is convenient, and it can be applied to the response speed test of various types of valve cores A, and can be applied to fields such as engines and hydraulic systems.

[0044] Preferably, the ejection device 21 can eject the ejector rod 22 in a pneumatic manner, using compressed air to push the piston and eject the ejector rod 22 with the piston; the ejection device 21 can also eject the ejector rod 22 in a manner of electromagnetic pulse. The ejector rod 22 made of metal material is used, and the electromagnetic coil is quickly energized and then instantaneously de-energized to generate a strong magnetic field change. This magnetic field change will induce eddy currents inside the metal ejector rod 22, and the eddy currents will interact with the magnetic field to generate a reverse magnetic field, thereby pushing the ejector rod 22 to eject.

[0045] More preferably, the ejection device 21 uses the second elastic member 211 to eject the ejector rod 22. The elastic member has a simple structure, low cost, high stability, and can be reused.

[0046] Specifically, the setting method of the second elastic member 211 is as Figure 4 shown. The ejection device 21 includes a second elastic member 211 and a limiting plate 212. The limiting plate 212 is connected to the fixing device 1. The limiting plate 212 is arranged between the second elastic member 211 and the valve core A. One end of the ejector rod 22 abuts against the second valve block A2, one end of the second elastic member 211 abuts against the limiting plate 212, and the other end of the second elastic member 211 abuts against the other end of the ejector rod 22.

[0047] It should be noted that the elastic force of the second elastic member 211 does not act on the second valve block A2, but acts on the limiting plate 212 and the ejector rod 22. That is, when the ejector rod 22 presses against the second valve block A2, it overcomes the elastic forces of the first elastic member and the second elastic member 211 at the same time. When the ejector rod 22 is released, since the elastic force of the second elastic member 211 is greater than the elastic force of the first elastic member A3, the speed at which the second elastic member 211 pushes the ejector rod 22 to eject is greater than the speed at which the first elastic member A3 expands. Therefore, the influence on the response of the valve core A is smaller, so as to more accurately simulate the response rate of the valve core A under actual working conditions and improve the accuracy of the test results.

[0048] Furthermore, a through hole is provided on the limiting plate 212, and the ejector rod 22 passes through the through hole. The axis of the through hole and the action line of the elastic force of the first elastic member A3 are parallel to each other.

[0049] The setting of the through hole ensures the ejection path of the ejector rod 22. The axis of the through hole and the action line of the elastic force of the first elastic member A3 are parallel to each other to ensure that the direction of the elastic force released by the first elastic member A3 is the same as the direction in which the ejector rod 22 is ejected, so as to avoid obstacles between the ejector rod 22 and the second valve block A2 during the movement in other directions.

[0050] In addition, the axis of the preferred through hole should be within the range of the elastic force of the first elastic member A3. That is, in the direction perpendicular to the axis of the through hole, the distance between the axis of the through hole and the point where the first elastic member A3 releases the elastic force should not be too large. Otherwise, the ejector rod 22 will deviate greatly from the first elastic member A3, resulting in the second valve block A2 not being pressed towards the first valve block A1 along the direction of the elastic force line of the first elastic member A3, and the detection result will not be accurate.

[0051] See Figures 2 to 3 , furthermore, the other end of the ejector rod 22 has an end portion 221 with a larger size, and the other end of the second elastic member 211 abuts against the end portion 221. The end portion 221 provides a larger supporting area for the second elastic member 211, effectively enhancing the supporting force of the second elastic member 211, enabling it to more stably withstand the impact force generated during the ejection process.

[0052] Furthermore, the pressing and releasing device 2 further includes a locking pin 213. The locking pin 213 is rotatably connected to the fixing device 1. A locking buckle 222 is provided on the ejector rod 22. The locking pin 213 and the locking buckle 222 cooperate with each other. The cooperation structure of the locking pin 213 and the locking buckle 222 can effectively lock the ejector rod 22. When releasing, only the locking pin 213 needs to rotate with the fixing device 1 to unlock the cooperation between the locking pin 213 and the locking buckle 222 to achieve ejection. The structure is simple and has high stability.

[0053] Specifically, the locking buckle 222 on the ejector rod 22 is a groove structure. The locking pin 213 includes a locking plate 213a and a rotating shaft 213b. The middle of the locking plate 213a is rotatably connected to the fixing device 1 through the rotating shaft 213b. A hook-shaped portion 213d is provided at one end of the locking plate 213a for buckling the locking buckle 222 with a groove structure. The other end of the locking plate 213a is a rotating handle 213c for the user to rotate.

[0054] Furthermore, the locking pin 213 is arranged between the valve core A and the second elastic member 211. Substantially, the locking pin 213 is arranged between the first elastic member A3 and the second elastic member 211, effectively fixing the ejector rod 22 and having higher stability.

[0055] Furthermore, the fixing device 1 includes a first fixing portion 11 and a second fixing portion 12 arranged oppositely. The first fixing portion 11 and the second fixing portion 12 enclose a chamber. The valve core A is arranged in the chamber. The first valve block A1 is connected to the first fixing portion 11. The locking pin 213 and the limiting plate 212 are both installed on the second fixing portion 12. The first fixing portion 11 and the second fixing portion 12 enclosing a chamber further simulates the working environment of the valve core A and reduces the influence of the external environment on the inside of the chamber during detection.

[0056] A guiding hole is provided on the second fixing portion 12 and is aligned with the through hole. The ejector rod 22 sequentially penetrates through the through hole and the guiding hole.

[0057] Furthermore, the spool response speed detection device of the solenoid valve further includes a tooling base 4. The fixing device 1 and the speed measuring device 3 are both installed on the tooling base 4. The first valve block A1 is in threaded fit with the fixing device 1. The tooling base 4 provides a unified installation platform, integrating the fixing device 1 and the speed measuring device 3, simplifying the installation process and improving the installation efficiency.

[0058] As Figures 2 to 3 shown, the tooling base 4 includes an L-shaped bracket 41 for fixing the speed measuring device 3.

[0059] When testing flow control valves of different models, only the first valve block A1 with matching threads needs to be replaced and the position of the speed measuring device 3 adjusted to achieve the versatility of the tooling.

[0060] Further, the speed measuring device 3 includes a laser displacement sensor. A hole 121 is provided in the second fixing portion 12 opposite to the laser transceiver device of the laser displacement sensor. The hole 121 is opposite to the second valve block A2. The setting of the hole 121 is for the emission and reception of the laser of the laser displacement sensor.

[0061] Through the laser displacement sensor, the movement speed of the second valve block A2 can be monitored in real time, so as to accurately grasp the operating state of the ejection device 21.

[0062] In addition, the method for the speed measuring device 3 to obtain the response speed can select the differential method, collect the position data of the second spool A at two different time points, calculate the difference in the front and rear distances, and divide the distance difference by the time difference to obtain the speed value.

[0063] The method for the speed measuring device 3 to obtain the response speed can also select the differential method to perform differential operation on the distance data to obtain the rate of change of the distance, that is, the speed value.

[0064] And some current laser displacement sensors themselves integrate the function of a speed sensor and can directly calculate the speed value through an internal algorithm.

[0065] Further, the first elastic member A3 and the second elastic member 211 are both springs. The acting lines of the elastic forces of the first elastic member A3 and the second elastic member 211 are both straight lines extending horizontally. The acting line of the elastic force of the spring is a straight line extending horizontally, which can ensure that the ejection force acts stably on the spool A and effectively avoid the deviation of the ejection force direction, improve the ejection accuracy, and thus more accurate test data can be obtained.

[0066] It should be noted that for a general spool A, the spring force of the selected second elastic member 211 needs to be greater than 20 N; it is horizontally set in the manner of Figure 2 when the device is operating; the response moving displacement of the detected spool A should be greater than 3 mm.

[0067] Before testing, rotate and tightly fix the first valve block A1 with the valve core A assembled into the fixing device 1. Press the second valve block A2 through the ejector rod 22 to make the valve core A in the first state. During the pressing process, the ejector rod 22 presses the second elastic member 211 at the same time. When the valve core A is pressed to the first state, fix the ejector rod 22 with the locking pin 213.

[0068] During testing, rotate the locking pin 213 to make contact and cooperation between the locking pin 213 and the lock catch 222. The ejector rod 22 is ejected by the second elastic member 211, and the first elastic member A3 drives the valve core A to return to the second state. The detection device detects the moving speed of the second valve block A2, and thus obtains the response rate of the valve core A.

[0069] The embodiments of this specific implementation manner are all preferred embodiments of the present invention, and do not limit the protection scope of the present invention accordingly. Therefore, all equivalent changes made according to the structure, shape, and principle of the present invention should be covered within the protection scope of the present invention.

Claims

1. A valve core response speed detection device for a solenoid valve, used for detecting the response speed of a valve core (A), wherein the valve core (A) comprises a first valve block (A1), a second valve block (A2) and a first elastic member (A3), wherein the first valve block (A1) and the second valve block (A2) are connected via the first elastic member (A3), and the valve core (A) has a first state in which the first elastic member (A3) is in a compressed state and a second state in which the first elastic member (A3) is in a natural state, characterized in that: The valve core response speed detection device of the solenoid valve comprises a fixing device (1), a pressure release device (2) and a speed measuring device (3), wherein the fixing device (1) fixes the first valve block (A1), the pressure release device (2) comprises an ejection device (21) and a push rod (22), the push rod (22) abuts against the second valve block (A2) and places the valve core (A) in the first state, the ejection device (21) drives the push rod (22) to eject and separate from the second valve block (A2), the ejection device (21) drives the push rod (22) to eject at a speed greater than a rebound speed of the first elastic member (A3), and the speed measuring device (3) measures the speed at which the second valve block (A2) moves after the push rod (22) and the second valve block (A2) are separated.

2. The valve core response speed detection device of the solenoid valve according to claim 1, characterized in that: The ejection device (21) comprises a second elastic member (211) and a limiting plate (212); the limiting plate (212) is connected to the fixing device (1); the limiting plate (212) is arranged between the second elastic member (211) and the valve core (A); one end of the push rod (22) abuts against the second valve block (A2); one end of the second elastic member (211) abuts against the limiting plate (212); and the other end of the second elastic member (211) abuts against the other end of the push rod (22).

3. The valve core response speed detection device of the solenoid valve according to claim 2, characterized in that: The limiting plate (212) is provided with a through hole, the push rod (22) passes through the through hole, and the axis of the through hole and the line of action of the elastic force of the first elastic member (A3) are parallel to each other.

4. The valve core response speed detection device of the solenoid valve according to claim 2, characterized in that: The other end of the push rod (22) has an end portion (221) with a larger size, and the other end of the second elastic member (211) abuts against the end portion (221).

5. The valve core response speed detection device of the solenoid valve according to claim 2, characterized in that: The pressure release device (2) further comprises a locking pin (213), wherein the locking pin (213) is rotatably connected to the fixing device (1), and a locking buckle (222) is provided on the top rod (22), wherein the locking pin (213) and the locking buckle (222) cooperate with each other.

6. The valve core response speed detection device of the solenoid valve according to claim 5, characterized in that: The lock pin (213) is arranged between the valve core (A) and the second elastic member (211).

7. The valve core response speed detection device of the solenoid valve according to claim 5, characterized in that: The fixing device (1) comprises a first fixing part (11) and a second fixing part (12) which are arranged opposite to each other, wherein the first fixing part (11) and the second fixing part (12) together form a chamber, the valve core (A) is arranged in the chamber, the first valve block (A1) is connected to the first fixing part (11), and the locking pin (213) and the limiting plate (212) are both mounted on the second fixing part (12).

8. The valve core response speed detection device of the solenoid valve according to claim 7, characterized in that: The speed measuring device (3) comprises a laser displacement sensor, and the second fixing portion (12) is provided with a hole (121) facing a laser transceiver of the laser displacement sensor, and the hole (121) faces the second valve block (A2).

9. The valve core response speed detection device of the solenoid valve according to claim 2, characterized in that: The first elastic member (A3) and the second elastic member (211) are both springs, the lines of action of the elastic forces of the first elastic member (A3) and the second elastic member (211) are both horizontally extending straight lines, and the elastic force of the second elastic member (211) is greater than the elastic force of the first elastic member (A3).

10. The valve core response speed detection device of the solenoid valve according to claim 1, characterized in that: It also comprises a tooling base (4), the fixing device (1) and the speed measuring device (3) are both mounted on the tooling base (4), and the first valve block (A1) and the fixing device (1) are threadedly matched.

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