A test device for high-speed extrusion flow field of solenoid valve

Abstract

The invention discloses a test device for a high-speed extrusion flow field of an electromagnetic valve, comprising: an oil tank, a bottom boss, a bracket, a push-pull electromagnet, a connecting rod, a guide block and an armature II; the oil tank is filled with diesel, the bracket is fixed on the test bench, the push-pull electromagnet and the guide block are both fixed on the bracket, the push rod of the push-pull electromagnet is coaxially located above the through hole of the guide block, and the guide block is located in the oil tank; the connecting rod is located in the through hole of the guide block, the upper end of the connecting rod is fixedly connected to the push rod of the push-pull electromagnet, and the lower end surface of the connecting rod is fixedly connected to the armature II; the bottom boss is located at the inner bottom of the oil tank, opposite to the armature II in upper and lower directions; the invention is suitable for studying and observing the high-speed extrusion flow field between the armature and the electromagnet in the electromagnetic valve, and can directly observe the oil film through a high-speed CCD camera under armatures of different structures and sizes, different armature movement speeds and different oil film thicknesses, so as to study the flow field characteristics of the oil film under high-speed extrusion, and has a simple structure and is easy to assemble.

Description

Technical Field

[0001] The invention belongs to the technical field of fluid dynamics, and in particular relates to a test device for a high-speed extrusion flow field of a solenoid valve. Background Art

[0002] To meet increasingly stringent exhaust emission regulations, various electronically controlled fuel injection systems have been widely adopted in diesel engines. In both time-controlled, pulsed electronic injection systems and pressure-time controlled common rail injection systems, fuel injection is controlled by solenoid valves. In particular, in time-controlled, pulsed electronic diesel injection systems, injection timing and fuel volume are determined by high-speed, powerful solenoid valves. The dynamic response of the solenoid valves directly affects injection characteristics, such as the buildup of fuel injection pressure and the speed at which fuel pressure is released during the final stages of injection. This, in turn, impacts the engine's fuel economy and exhaust emissions.

[0003] The electronically controlled unit pump is a time-controlled pulsating electronically controlled diesel injection system. Figure 1 and 2 When the coil of electromagnet 23 is de-energized, an air gap of approximately 0.5 μm exists between armature I 21 and electromagnet 23. This gap is filled with diesel fuel, forming an oil film 22. When the coil is energized, armature I 21 is attracted to the electromagnet 23 and moves rightward. This squeezes oil film 22, reducing its thickness and causing changes in pressure within the film. This creates a force that resists this reduction in thickness. This hydraulic support exerted by the film on armature I 21 creates an "oil cushion" effect. This "oil cushion" effect slows the movement of the armature, delaying control valve closure and hindering the rapid buildup of high pressure in the electronically controlled unit pump. Therefore, minimizing or even eliminating this "oil cushion" effect, ensuring a more responsive solenoid valve and achieving rapid fuel supply and clean oil shut-off, is a pressing issue. Studying the flow field of the oil film 22 during high-speed squeezing is a prerequisite for minimizing or even eliminating this "oil cushion" effect.

[0004] Wang Peng et al. from Shanghai University proposed an experimental observation device for the squeezed oil film between parallel plates in the article “Test Design of Parallel Plate Squeeze Oil Film Noise”. Figure 3 and 4Its structure and working mode are as follows: the lubricating oil fills the entire oil pool 40, the vibrator 31 drives the movable bracket 35 to move up and down through the connecting rod, and the transparent glass plate 41 is fixed to the bottom end of the movable bracket. It can move up and down with the movable bracket 35 and realize the extrusion movement with the stationary lower parallel plate 38. The displacement sensor 37 is used to measure the actual displacement of the movable bracket (the extrusion amplitude of the two parallel plates) and the minimum oil film thickness of the extrusion; the differential pressure sensor 39 is fixed in the hole of the lower parallel plate. It is directly connected to the extruded oil film and can measure the tensile and compressive stresses in the oil film in real time. The reflector 42 is installed above the oil film through the reflector bracket 34. The reflector is placed at 45 degrees. The parallel light source shines on the reflector, and the reflector reflects the light through the glass plate into the oil film, illuminating the oil film. Then, the image of the oil film is reflected to the high-speed CCD in the opposite direction of the light path. The dynamic changes of the extruded oil film can be clearly seen through the CCD software platform.

[0005] However, this device cannot be used for experimental research on the high-speed extrusion flow field characteristics of solenoid valves for the following reasons: first, the movable bracket 35 is connected to the vibrator 31, which makes the upper plate obtain a certain amount of vibration, which is different from the working principle of the solenoid valve; second, the device can only obtain the changing image of the oil film perpendicular to the extrusion plane through the shooting of a high-speed camera, and cannot directly observe the situation of the oil film inside the device after being squeezed; third, when the experiment needs to change the shape of the upper plate, the upper plate cannot be replaced; fourth, the structure is complex and not easy to install and disassemble.

[0006] In addition to the experimental observation device for squeezing oil film between parallel plates mentioned above, the current research and experiments on the oil film squeezing flow field characteristics are mostly concentrated in the gap between the bearing outer ring and the bearing seat. There is no experimental device for exploring the high-speed squeezing flow field between the armature and the electromagnet in the solenoid valve. Therefore, it is necessary to study a high-speed squeezing flow field characteristics test device suitable for time-controlled electronically controlled injection systems such as electronically controlled single pumps, which is used to study and observe the high-speed squeezing flow field between the armature and the electromagnet in the solenoid valve. Summary of the Invention

[0007] In view of this, the present invention provides a test device for the high-speed extrusion flow field of a solenoid valve, which is suitable for studying and observing the high-speed extrusion flow field between the armature and the electromagnet in the solenoid valve. The oil film can be directly observed by a high-speed CCD camera under armatures of different structures and sizes, different armature movement speeds and different oil film thicknesses, and the flow field characteristics of the oil film under high-speed extrusion can be studied. The device has a simple structure and is easy to assemble.

[0008] The present invention is achieved through the following technical solutions:

[0009] A test device for high-speed extrusion flow field of a solenoid valve includes: an oil tank, a bottom boss, a bracket, a push-pull electromagnet, a connecting rod, a guide block and an armature II;

[0010] The fuel tank is filled with diesel;

[0011] A through hole is provided on the guide block; the outer diameter of the connecting rod is equal to the inner diameter of the through hole of the guide block;

[0012] The bracket is fixed on the test bench, the push-pull electromagnet and the guide block are both fixed on the bracket, the push rod of the push-pull electromagnet is coaxially located above the through hole of the guide block, and the guide block is located in the oil tank;

[0013] The connecting rod is located in the through hole of the guide block, the upper end of the connecting rod is fixedly connected to the push rod of the push-pull electromagnet, and the lower end surface of the connecting rod is fixedly connected to the armature II;

[0014] The bottom boss is located at the inner bottom of the oil tank, opposite to the armature II above and below;

[0015] When the push-pull electromagnet is not energized, the upper surface of the armature II abuts against the lower end surface of the guide block; after the push-pull electromagnet is energized, the push rod of the push-pull electromagnet drives the connecting rod to move downward along the through hole in the guide block, squeezing the oil film between the armature II and the bottom boss.

[0016] Furthermore, the test device for the high-speed squeezing flow field of the solenoid valve also includes a high-speed CCD camera. The oil tank is made of transparent material. The high-speed CCD camera is set on the side of the oil tank to record the process of the armature II squeezing the oil film.

[0017] Furthermore, the test device for the high-speed extrusion flow field of the solenoid valve further includes a lens and a light source. The light emitted by the light source is focused by the lens and then concentrated on the oil film between the armature II and the bottom boss.

[0018] Furthermore, the armature II is fixedly connected to the lower end surface of the connecting rod by means of screws.

[0019] Furthermore, the bracket includes a base and a flat plate. The longitudinal section of the base is "C"-shaped, including an upper horizontal plate, a lower horizontal plate, and a vertical plate. The lower horizontal plate extends to the side opposite to the opening direction of the "C"-shaped base, and the extended portion is called an extension plate. A triangular reinforcement plate is provided between the extension plate and the vertical plate. The flat plate is vertically mounted on the end of the upper horizontal plate of the base, and a triangular reinforcement plate is provided between the flat plate and the upper horizontal plate. The extension plate and the lower horizontal plate of the base are fixedly mounted on the test bench, and the portion of the flat plate that is higher than the upper horizontal plate is called the upper section of the flat plate, and the portion of the flat plate that is lower than the upper horizontal plate is called the lower section of the flat plate. A distance is left between the end of the lower section of the flat plate and the test bench.

[0020] The fuel tank is a cubic shell structure with an open top. A groove A is machined on one inner side of the fuel tank. The width of groove A is the same as the width of the lower section of the bracket's flat plate. The lower section of the bracket's flat plate is located in the fuel tank and fits in groove A on the inner side of the fuel tank. The upper end of the inner side abuts against the lower surface of the upper horizontal plate of the bracket's "C"-shaped base.

[0021] The guide block is fixed on the lower section of the flat plate of the bracket; and the side surface of the push-pull type electromagnet is fixed on the upper section of the flat plate of the bracket.

[0022] Furthermore, a vertical slide is provided on the upper section of the flat plate of the bracket, the upper end of the slide is open, and the side of the push-pull electromagnet is fixed to the slide of the bracket by bolts. When the bolts are loosened, the push-pull electromagnet can slide in the vertical direction on the slide, and when the bolts are tightened, the push-pull electromagnet is fixed relative to the bracket.

[0023] Furthermore, two right-angled positioning blocks are fixedly provided at the bottom of the fuel tank, and the two right-angled positioning blocks are opposite to each other and arranged along the diagonal line; the lower end of the bottom boss is a square structure, and is installed in the square surrounded by the two right-angled positioning blocks. The two positioning blocks at the bottom of the fuel tank limit the bottom boss in the horizontal direction.

[0024] Furthermore, a groove B is processed on the upper surface of the bottom boss, and the pressure sensor is installed in the groove B. The upper surface of the pressure sensor is flush with the upper surface of the bottom boss.

[0025] Furthermore, a gasket is provided between the armature II and the guide block.

[0026] Furthermore, the connecting rod adopts a control valve, a cavity is provided in the middle of the control valve, and a radial through hole is provided on the outer wall of the cavity.

[0027] Beneficial effects:

[0028] (1) In the present invention, when the push-pull electromagnet is not energized, the upper surface of the armature II abuts against the lower end surface of the guide block; after the push-pull electromagnet is energized, the push rod of the push-pull electromagnet drives the connecting rod to move downward along the through hole in the guide block, squeezing the oil film between the armature II and the bottom boss. Through the above structure, the armature II is equivalent to the armature in the electric-controlled single-unit pump, and the upper surface of the bottom boss is equivalent to the surface of the electromagnet in contact with the armature. The flow field characteristics of the oil film squeezed between the armature II and the upper surface of the bottom boss are the same as the flow field characteristics of the oil film squeezed between the armature and the electromagnet. Therefore, the present invention can be applied to observe and study the high-speed squeezing flow field between the armature and the electromagnet of the solenoid valve in the time-controlled electric-controlled injection system such as the electric-controlled single-unit pump.

[0029] The present invention adopts a push-pull electromagnet, which can change the moving speed of the push-pull electromagnet push rod (0.5-3m / s) by changing the power supply voltage to change the moving speed of the armature II, thereby providing an experimental basis for studying the influence of different speeds of the armature II squeezing the oil film on the oil film.

[0030] (2) In the present invention, the oil tank is made of a transparent material, and a high-speed CCD camera is installed on the side of the oil tank to record the process of the armature II 10 squeezing the oil film, allowing clear and direct observation of the condition of the oil film inside the device after being squeezed. In addition, the oil cylinder of the present invention is made of a transparent material with good light transmittance, so the process of the armature II squeezing the oil film can be captured even in the absence of a light source.

[0031] (3) In the present invention, the light emitted by the light source is focused by the lens and concentrated on the oil film between the armature II and the bottom boss, which is used to provide brightness for the high-speed CCD camera to record the armature squeezing oil film process, ensuring the clarity and accuracy of the record.

[0032] (4) In the present invention, the armature II is fixedly connected to the lower end surface of the connecting rod through the control valve screw, so that the armature II with different structures can be replaced to study the influence of the armature structure on the flow characteristics of the squeeze oil film.

[0033] (5) In the present invention, the bracket includes a base and a flat plate, the longitudinal section of the base is "C"-shaped, including an upper horizontal plate, a lower horizontal plate and a vertical plate, wherein the lower horizontal plate extends to the side opposite to the opening direction of the "C"-shaped base, so that the extended part is an extension plate, and a triangular reinforcement plate is provided between the extension plate and the vertical plate; the flat plate is vertically installed at the end of the upper horizontal plate of the base, and a triangular reinforcement plate is provided between the flat plate and the upper horizontal plate; the extension plate and the lower horizontal plate of the base are fixedly installed on the test bench, so that the part of the flat plate higher than the upper horizontal plate is the upper section of the flat plate, and the part of the flat plate lower than the upper horizontal plate is the lower section of the flat plate, and a distance is left between the end of the lower section of the flat plate and the test bench; a groove A is processed on an inner side surface of the oil tank 1, and the width of the groove A is the same as the width of the lower section of the flat plate of the bracket; the lower section of the flat plate of the bracket is located in the oil tank, and the lower section of the flat plate of the bracket is installed in conjunction with the groove A on the inner side surface of the oil tank; and the upper end of the inner side surface is against the lower surface of the upper horizontal plate of the "C"-shaped base of the bracket. Among them, the design of the bracket's "C"-shaped base and reinforcement plate and its coordination with the oil tank can position and install the oil tank and ensure the stability of the entire device when the push rod of the push-pull electromagnet moves at high speed.

[0034] (6) The upper section of the flat plate of the bracket of the present invention is provided with a vertical chute, the upper end of which is open. The side of the push-pull electromagnet is fixed to the chute of the bracket by bolts. When the bolts are loosened, the push-pull electromagnet can slide in the vertical direction on the chute. When the bolts are tightened, the push-pull electromagnet is fixed relative to the bracket. On the one hand, the provision of the chute facilitates adjustment of the height of the push-pull electromagnet; on the other hand, the upper end of the chute is open, so the electromagnet can be installed and removed from the upper end, which facilitates assembly of the device.

[0035] (7) The bottom boss of the present invention is horizontally limited by two right-angled positioning blocks at the bottom of the oil tank, which facilitates the disassembly, cleaning and replacement of the bottom boss and also facilitates the assembly of the entire device.

[0036] (8) The bottom boss of the present invention has a groove B machined into its upper surface. The pressure sensor is mounted in groove B, with its upper surface flush with the upper surface of the bottom boss. By providing groove B for mounting the pressure sensor, the upper surface of the bottom boss remains flat, simulating the contact surface of the electromagnet with the armature, while ensuring proper measurement of the oil film pressure.

[0037] (9) The present invention installs gaskets between the armature II and the guide block, and the number of gaskets can be adjusted to adjust the initial thickness of the oil film between the armature II and the bottom boss.

[0038] (10) The connecting rod of the present invention adopts a control valve. The control valve serves to connect the push-pull electromagnet with the armature II. The use of the control valve for connection can simulate the working state of the electromagnetic valve in a real environment and obtain real data to the maximum extent. BRIEF DESCRIPTION OF THE DRAWINGS

[0039] Figure 1 This is the structural diagram of the electronically controlled unit pump;

[0040] Figure 2 yes Figure 1 An enlarged view of a part A;

[0041] Figure 3 This is a structural diagram of the experimental observation device for squeezing oil film between parallel plates;

[0042] Figure 4 yes Figure 3 An enlarged view of part B;

[0043] Figure 5 This is the overall schematic diagram of the solenoid valve high-speed extrusion flow field characteristic test device;

[0044] Figure 6 It is a diagram of the internal structure of the extrusion test component;

[0045] Figure 7 It is a schematic diagram of the connection relationship between the fuel tank, bracket and bottom boss;

[0046] Figure 8 This is the appearance diagram of the extrusion test component;

[0047] Figure 9 yes Figure 6 A magnified view of the local C.

[0048] Among them, 1-oil tank, 2-bottom boss, 3-gasket, 4-bracket, 5-pad, 6-push-pull electromagnet, 7-control valve, 8-guide block, 9-control valve screw, 10-armature II, 11-pressure sensor, 12-positioning block, 13-high-speed CCD camera, 14-extrusion test assembly, 15-lens, 16-light source, 21-armature I, 22-oil film, 23-electromagnet, 31-vibrator, 32-static bracket, 34-mirror bracket, 35-moving bracket, 36-support plate, 37-displacement sensor, 38-lower plate, 39-pressure sensor, 40-oil pool, 41-glass plate, 42-mirror. DETAILED DESCRIPTION

[0049] The present invention is described in detail below with reference to the accompanying drawings and embodiments.

[0050] This embodiment provides a test device for the high-speed extrusion flow field of a solenoid valve, see the attached Figure 5 , including a high-speed CCD camera 13 and an extrusion test assembly 14. The extrusion test assembly 14 is used to simulate the armature I and the electromagnet squeezing the oil film. The high-speed CCD camera 13 is installed on the side of the extrusion test assembly 14 to record the process of the armature II squeezing the oil film. The shooting rate of the high-speed CCD camera is 8000 frames / second.

[0051] See attached Figure 6 The extrusion test assembly 14 includes a fuel tank 1, a bottom boss 2, a gasket 3, a bracket 4, a pad 5, a push-pull electromagnet 6, a connecting rod, a guide block 8, a control valve screw 9, an armature II 10 and a pressure sensor 11;

[0052] The bracket 4 includes an integrally formed base and a flat plate. The longitudinal section of the base is "C"-shaped, including an upper horizontal plate, a lower horizontal plate and a vertical plate, wherein the lower horizontal plate extends to the side opposite to the opening direction of the "C"-shaped base, and the extended part is made into an extension plate, and a triangular reinforcement plate is provided between the extension plate and the vertical plate; the flat plate is vertically mounted on the end of the upper horizontal plate of the base, and a triangular reinforcement plate is provided between the flat plate and the upper horizontal plate; the part of the flat plate that is higher than the upper horizontal plate is the upper section of the flat plate, and the part of the flat plate that is lower than the upper horizontal plate is the lower section of the flat plate, and the upper section of the flat plate is provided with a vertical slide, the upper end of the slide is open, and preferably, the number of the slides is two; the extension plate and the lower horizontal plate of the base are fixed to the test bench by screws, and a distance is left between the end of the lower section of the flat plate and the test bench;

[0053] The fuel tank 1 is a cubic shell structure with an open top. A groove A is machined on one inner side of the fuel tank 1. The width of the groove A is the same as the width of the lower section of the flat plate of the bracket 4. Figure 8The bottom of the fuel tank 1 is fixed with two right-angled positioning blocks 12, which are opposite and arranged along the diagonal line; the fuel tank 1 is transparent, preferably a glass plate; the fuel tank 1 is filled with diesel;

[0054] The lower end of the bottom boss 2 is a square structure, the upper surface is flat, and a groove B is processed on the upper surface;

[0055] A push rod is provided in the push-pull electromagnet 6. When the coil of the push-pull electromagnet 6 is energized, the push rod extends outward, and when the coil is de-energized, the push rod retracts inward.

[0056] The guide block 8 is provided with a coaxial stepped through hole;

[0057] The outer diameter of the connecting rod is equal to the inner diameter of the small diameter hole of the guide block 8. The preferred connecting rod is a control valve 7. The middle of the control valve 7 is provided with a cavity, and the outer wall of the cavity is provided with a radial through hole.

[0058] The connection relationship between each component is as follows:

[0059] See attached Figure 7 The lower section of the flat plate of the bracket 4 is located in the fuel tank 1. Specifically, the lower section of the flat plate of the bracket 4 is fitted into the groove A on the inner side of the fuel tank 1, and the upper end of the inner side abuts against the lower surface of the upper horizontal plate of the "C"-shaped base of the bracket 4, thereby positioning and installing the fuel tank 1.

[0060] The bottom boss 2 is mounted in a square formed by two right-angled positioning blocks 12 at the bottom of the fuel tank 1. The two positioning blocks 12 at the bottom of the fuel tank 1 limit the bottom boss 2 in the horizontal direction.

[0061] The pressure sensor 11 is installed in the groove B of the bottom boss 2, and the upper surface of the pressure sensor 11 is flush with the upper surface of the bottom boss 2; the pressure sensor 11 is used to measure the pressure of the squeeze oil film;

[0062] See attached Figure 6 and 8 The side of the push-pull electromagnet 6 is mounted on the slide groove of the bracket 4 by bolts. When the bolts are loosened, the push-pull electromagnet 6 can slide in the vertical direction on the slide groove. When the bolts are tightened, the push-pull electromagnet 6 is fixed relative to the bracket 4.

[0063] The guide block 8 is fixed to the lower section of the flat plate of the bracket 4 by bolts, and the stepped through hole of the guide block 8 is vertical, with the small diameter hole of the stepped through hole located at the upper end and the large diameter hole located at the lower end;

[0064] The push rod of the push-pull electromagnet 6 and the stepped through hole of the guide block 8 are coaxially arranged. Specifically, a spacer 5 is provided between the push-pull electromagnet 6 and the flat plate of the bracket 4 so that the push rod of the push-pull electromagnet 6 and the stepped through hole of the guide block 8 are coaxial.

[0065] See attached Figure 6 and 9 , the control valve 7 is located in the stepped through hole of the guide block 8, and the control valve 7 can move linearly up and down in the stepped through hole of the guide block 8; the upper end of the control valve 7 is threadedly connected to the lower end of the push rod of the push-pull electromagnet 6, and the lower end surface of the control valve 7 is fixedly connected to the armature II 10 through the control valve screw 9, wherein the control valve 7 plays the role of connecting the push-pull electromagnet 6 with the armature II 10. Using the control valve 7 for connection can simulate the working state of the electromagnetic valve in the real environment and obtain real data to the maximum extent; when the push-pull electromagnet 6 is not energized, the upper surface of the armature II 10 is in contact with the guide The lower end surface of the block 8 abuts against each other; a gasket 3 is installed between the armature II 10 and the guide block 8 to adjust the initial thickness of the oil film between the armature II 10 and the bottom boss 2; when the push-pull electromagnet 6 is energized, the push rod of the push-pull electromagnet 6 drives the control valve 7 to move downward along the stepped through hole in the guide block 8; the test device for the high-speed extrusion flow field of the solenoid valve also includes a lens 15 and a light source 16. The light emitted by the light source 16 is focused by the lens 15 and concentrated on the oil film between the armature II and the bottom boss 2, which is used to provide brightness for the high-speed CCD camera to clearly record the armature extrusion oil film process.

[0066] Working principle:

[0067] Fuel tank 1 is filled with diesel. When push-pull electromagnet 6 is energized, its push rod drives control valve 7 downward along the through-hole in guide block 8. Control valve 7, in turn, drives its fixedly connected armature II 10 to squeeze the oil film between armature II 10 and bottom boss 2. Pressure sensor 11 records the force applied to the oil film, and a high-speed CCD camera 13 records the process of oil film squeezing. When push-pull electromagnet 6 is de-energized, the push rod drives armature II 10 upward to return to its original position.

[0068] The armature II 10 is equivalent to the armature I 21 in the electronically controlled single pump, the upper surface of the bottom boss 2 is equivalent to the surface where the electromagnet 23 contacts the armature I 21, and the setting of the control valve 7 is equivalent to the valve body in the electronically controlled single pump. The flow field characteristics of the oil film squeezed between the armature II 10 and the upper surface of the bottom boss 2 are the same as the flow field characteristics of the oil film squeezed between the armature I 21 and the electromagnet 23. Therefore, the device can be used to observe and study the high-speed squeezing flow field between the armature and the electromagnet of the solenoid valve in the time-controlled electronic injection system such as the electronically controlled single pump.

[0069] In summary, the above are only preferred embodiments of the present invention and are not intended to limit the scope of protection of the present invention. Any modifications, equivalent replacements, improvements, etc. made within the spirit and principles of the present invention should be included in the scope of protection of the present invention.

Claims

1. A test device for high-speed extrusion flow field of electromagnetic valve, characterized in that: include: Oil tank (1), bottom boss (2), bracket (4), push-pull electromagnet (6), connecting rod, guide block (8) and armature II (10); The fuel tank (1) is filled with diesel; A through hole is provided on the guide block (8); the outer diameter of the connecting rod is equal to the inner diameter of the through hole of the guide block (8); The bracket (4) is fixed on the test bench, the push-pull electromagnet (6) and the guide block (8) are both fixed on the bracket (4), the push rod of the push-pull electromagnet (6) is coaxially located above the through hole of the guide block (8), and the guide block (8) is located in the oil tank (1); The connecting rod is located in the through hole of the guide block (8), the upper end of the connecting rod is fixedly connected to the push rod of the push-pull electromagnet (6), and the lower end surface of the connecting rod is fixedly connected to the armature II (10); The bottom boss (2) is located at the inner bottom of the oil tank (1) and is opposite to the armature II (10) in the vertical direction; When the push-pull electromagnet (6) is not energized, the upper surface of the armature II (10) abuts against the lower end surface of the guide block (8); after the push-pull electromagnet (6) is energized, the push rod of the push-pull electromagnet (6) drives the connecting rod to move downward along the through hole in the guide block (8), squeezing the oil film between the armature II (10) and the bottom boss (2).

2. A test device for high-speed extrusion flow field of a solenoid valve as claimed in claim 1, characterized in that: Also includes: The high-speed CCD camera (13) is made of a transparent material and is arranged on the side of the oil tank (1) to record the process of the armature II (10) squeezing the oil film.

3. A test device for high-speed extrusion flow field of a solenoid valve as claimed in claim 2, characterized in that: It also includes a lens (15) and a light source (16). The light emitted by the light source (16) is focused by the lens (15) and then concentrated on the oil film between the armature II and the bottom boss (2).

4. A test device for high-speed extrusion flow field of a solenoid valve as claimed in claim 3, characterized in that: The armature II (10) is fixedly connected to the lower end surface of the connecting rod through a screw.

5. A test device for high-speed extrusion flow field of a solenoid valve according to any one of claims 1 to 4, characterized in that: The bracket (4) includes a base and a flat plate. The longitudinal section of the base is "C"-shaped and includes an upper horizontal plate, a lower horizontal plate and a vertical plate. The lower horizontal plate extends to the side opposite to the opening direction of the "C"-shaped base, and the extended portion is an extension plate. A triangular reinforcement plate is provided between the extension plate and the vertical plate. The flat plate is vertically mounted on the end of the upper horizontal plate of the base, and a triangular reinforcement plate is provided between the flat plate and the upper horizontal plate. The extension plate and the lower horizontal plate of the base are fixedly mounted on the experimental table, and the portion of the flat plate that is higher than the upper horizontal plate is the upper section of the flat plate, and the portion of the flat plate that is lower than the upper horizontal plate is the lower section of the flat plate. A distance is left between the end of the lower section of the flat plate and the experimental table. The oil tank (1) is a cubic shell structure with an open top. A groove A is machined on an inner side surface of the oil tank (1). The width of the groove A is the same as the width of the lower section of the flat plate of the bracket (4). The lower section of the flat plate of the bracket (4) is located in the oil tank (1). The lower section of the flat plate of the bracket (4) is fitted with the groove A on the inner side surface of the oil tank (1). The upper end of the inner side surface abuts against the lower surface of the upper horizontal plate of the "C"-shaped base of the bracket (4). The guide block (8) is fixed to the lower section of the flat plate of the bracket (4); and the side surface of the push-pull electromagnet (6) is fixed to the upper section of the flat plate of the bracket (4).

6. A test device for high-speed extrusion flow field of a solenoid valve as claimed in claim 5, characterized in that: The upper section of the flat plate of the bracket (4) is provided with a vertical slide groove, the upper end of the slide groove is open, and the side surface of the push-pull electromagnet (6) is fixed to the slide groove of the bracket (4) by bolts. When the bolts are loosened, the push-pull electromagnet (6) can slide in the vertical direction on the slide groove, and when the bolts are tightened, the push-pull electromagnet (6) is fixed relative to the bracket (4).

7. A test device for high-speed extrusion flow field of a solenoid valve according to any one of claims 1 to 4, characterized in that: Two right-angled positioning blocks (12) are fixedly arranged at the bottom of the oil tank (1), and the two right-angled positioning blocks (12) are opposite to each other and arranged along a diagonal line; the lower end of the bottom boss (2) is a square structure and is cooperatively installed in the square surrounded by the two right-angled positioning blocks (12), and the two positioning blocks (12) at the bottom of the oil tank (1) limit the bottom boss (2) in the horizontal direction.

8. A test device for high-speed extrusion flow field of a solenoid valve according to any one of claims 1 to 4, characterized in that: A groove B is machined on the upper surface of the bottom boss (2), and the pressure sensor (11) is installed in the groove B. The upper surface of the pressure sensor (11) is flush with the upper surface of the bottom boss (2).

9. A test device for high-speed extrusion flow field of a solenoid valve according to any one of claims 1 to 4, characterized in that: A gasket (3) is provided between the armature II (10) and the guide block (8).

10. A test device for high-speed extrusion flow field of a solenoid valve according to any one of claims 1 to 4, characterized in that: The connecting rod adopts a control valve (7), a cavity is provided in the middle of the control valve (7), and a radial through hole is provided on the outer wall of the cavity.

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