A solenoid valve pilot stage assembly adjustment device and adjustment method

Abstract

The present application relates to the technical field of electromagnetic valve test adjusting device, and particularly relates to an electromagnetic valve pilot stage assembly adjusting device and adjusting method.The electromagnetic valve pilot stage assembly adjusting device comprises a sealing valve block, a pressing mechanism, a push rod, a driving mechanism, a flowmeter, a pressure difference sensor and a controller, the controller is signal connected with the flowmeter, the pressure difference sensor and the driving mechanism.The present application adjusts the adjusting sleeve by controlling the push rod movement before the electromagnetic valve assembly is assembled, in the electromagnetic valve pilot stage assembly stage, and the pilot stage assembly is independently dynamically adjusted in fluid pressure and flow by combining the detection of the flowmeter and the pressure difference sensor and the closed loop adjustment of the controller, so that the pilot stage assembly meets the requirements, the pressure-flow characteristic consistency of each pilot stage assembly is improved, the PQ performance tends to be stable, the performance requirements are met, and the PQ consistency of the assembled electromagnetic valve is good on the basis of the adjusted pilot stage assembly.

Description

Technical Field

[0001] This invention relates to the technical field of solenoid valve testing and adjustment devices, and in particular to a solenoid valve pilot stage component adjustment device and adjustment method. Background Technology

[0002] In the manufacturing process of solenoid valves for electronically controlled vibration dampers (ADCs), the industry generally adopts the practice of first assembling the solenoid valves into a complete assembly, and then conducting pressure-flow (PQ) characteristic tests on the assembly.

[0003] However, due to the objective existence of manufacturing tolerances for different parts, the limited repeatability of press-fitting of servo presses, deformation caused by interference fits, and springback after press-fitting, the PQ characteristics of the entire valve have a large variation. The industry can usually only control the PQ consistency within the range of 15% to 20%, which is difficult to meet higher performance requirements. Summary of the Invention

[0004] The purpose of this invention is to provide a solenoid valve pilot stage component adjustment device and adjustment method to improve the PQ consistency of the solenoid valve.

[0005] To solve the above-mentioned technical problems, the present invention provides an adjustment device and adjustment method for a solenoid valve pilot stage component.

[0006] The solenoid valve pilot stage assembly adjustment device of the present invention includes: A sealing valve block is used for sealing connection with the valve sleeve of the pilot stage assembly of the solenoid valve, and has a fluid passage inside. A clamping mechanism is used to clamp and fix the solenoid valve pilot stage assembly to the sealing valve block; The push rod is used to push against the adjusting sleeve in the pilot stage assembly of the solenoid valve; A drive mechanism is used to drive the push rod to move; A flow meter, connected to the fluid channel, is used to detect the flow rate of fluid passing through the pilot stage assembly of the solenoid valve; A differential pressure sensor, connected to the fluid channel, is used to detect the pressure difference between the inlet and outlet of the solenoid valve pilot stage assembly; The controller is connected to the flow meter, the differential pressure sensor, and the drive mechanism. The controller is configured to: maintain the differential pressure within a preset range based on the detection value of the differential pressure sensor, and acquire the detection value of the flow meter. When the detection value deviates from the preset target flow value, the controller controls the drive mechanism to drive the push rod to move until the detection value of the flow meter reaches the target flow value.

[0007] Furthermore, the push rod is a cylinder with an axial flow channel inside. The side wall of the push rod has multiple radial through holes that communicate with the axial flow channel, allowing fluid to enter the central hole of the push rod and flow to the adjusting sleeve.

[0008] Furthermore, the sealing valve block is provided with an inlet channel and an outlet channel inside, the inlet radial through hole of the push rod is connected to the inlet channel, the sealing valve block is also provided with a movable through hole for the push rod to pass through and for sealing cooperation, and the outlet channel is used for the fluid flowing out from the outlet of the solenoid valve pilot stage assembly.

[0009] Furthermore, it also includes a receiving chamber, in which the sealing valve block is arranged. A transition assembly is also arranged in the receiving chamber. The flow meter and the differential pressure sensor are both connected to the sealing valve block through the transition assembly. The transition assembly includes a first transition block and a second transition block. The first transition block has a first transition channel for connecting to the inlet channel, and the flow meter communicates with the first transition channel. The second transition block has a second transition channel for connecting to the outlet channel.

[0010] Furthermore, the sealing valve block is provided with a first settling groove and a second settling groove arranged in opposite directions. The sealing valve block is also provided with a first flow channel and a second flow channel. The first flow channel is connected to the first settling groove and the two together constitute the liquid inlet channel. The second flow channel is connected to the second settling groove and the two together constitute the liquid outlet channel.

[0011] Furthermore, the sealing valve block is also provided with a third flow channel extending to the movable through hole. The third flow channel is located between the first settling tank and the second settling tank. The first adapter block also has a third adapter channel. The side wall of the push rod is also provided with a differential pressure radial through hole communicating with the axial flow channel. One end of the third flow channel is connected to one end of the differential pressure sensor, and the other end is connected to the differential pressure radial through hole. The other end of the differential pressure sensor is connected to the liquid outlet channel.

[0012] Furthermore, the clamping mechanism includes a clamping drive and a pressure block, with the pressure block arranged at the output end of the clamping drive.

[0013] The present invention also provides a method for adjusting a pilot stage assembly of a solenoid valve, comprising: The solenoid valve pilot stage assembly is fixed to the solenoid valve pilot stage assembly adjustment device as described in any of the above technical solutions, and the push rod is aligned with the adjustment sleeve in the solenoid valve pilot stage assembly. Fluid is introduced into the pilot stage assembly of the solenoid valve, and the pressure difference between the inlet and outlet of the solenoid valve pilot stage assembly is monitored by a differential pressure sensor to maintain the pressure difference within a preset range. The flow rate of fluid passing through the pilot stage assembly of the solenoid valve is monitored in real time using a flow meter. The control drive mechanism drives the push rod to adjust the fluid flow rate through the pilot stage assembly of the solenoid valve until the monitored flow rate value reaches the preset target flow rate range.

[0014] Furthermore, when the detected flow rate value deviates from the target flow rate value by more than a preset deviation threshold, the drive mechanism pushes the push rod with a first step distance; when the detected flow rate value deviates from the target flow rate value by no more than the preset deviation threshold, the drive mechanism switches to pushing the push rod with a second step distance, wherein the first step distance is greater than the second step distance, and the second step distance is a micrometer-level step distance.

[0015] Furthermore, before fixing the solenoid valve pilot stage assembly to the solenoid valve pilot stage assembly adjustment device as described in any of the above technical solutions, the solenoid valve pilot stage assembly is first run-in.

[0016] Compared with the prior art, the present invention has at least the following beneficial effects: The solenoid valve pilot stage assembly adjustment device of the present invention adjusts the adjusting sleeve by controlling the movement of the push rod during the pilot stage assembly stage before the solenoid valve assembly is assembled. Combined with the detection of the flow meter and differential pressure sensor and the closed-loop adjustment of the controller, the pilot stage assembly is independently and dynamically adjusted for fluid pressure and flow to meet the requirements. This improves the consistency of pressure-flow characteristics of each pilot stage assembly, making its PQ performance more stable and meeting the performance requirements. Based on the adjusted pilot stage assembly, the assembled solenoid valve has better PQ consistency, thus overcoming the problem of large PQ characteristic dispersion of solenoid valves caused by factors such as part tolerances and press-fit accuracy in traditional manufacturing. Attached Figure Description

[0017] Figure 1 This is a schematic diagram of the solenoid valve pilot stage assembly with the coil hidden. Figure 2 A cross-sectional view of the pilot stage assembly of a solenoid valve with the coil hidden. Figure 3 This is a schematic diagram showing the state of the solenoid valve pilot stage assembly during adjustment, according to an embodiment of the solenoid valve pilot stage assembly adjustment device of the present invention. Figure 4 for Figure 3 A schematic diagram of the structure of an embodiment of the solenoid valve pilot stage component adjustment device, hidden behind a protective cover, from another perspective. Figure 5 for Figure 3 A schematic diagram of the hidden portion of the structure of an embodiment of the solenoid valve pilot stage component adjustment device; Figure 6 for Figure 5 A cross-sectional view of a hidden portion of the structure of an embodiment of a solenoid valve pilot stage assembly regulating device; Figure 7 for Figure 6 A schematic diagram of the push rod in the diagram; Figure 8 for Figure 7 A cross-sectional view of the push rod in the middle; Figure 9 for Figure 6 A schematic diagram of the sealing valve block in the diagram; Figure 10 for Figure 9 Another structural diagram of the sealing valve block in the middle; Figure 11 for Figure 9 A cross-sectional view of the sealing valve block in the middle; Figure 12 for Figure 6 A schematic diagram of the structure of the first adapter block in the process; Figure 13 for Figure 12 Another structural diagram of the first transition block in the middle; Figure 14 for Figure 13 A sectional view of the first transition block in the middle along line AA; Figure 15 for Figure 13 BB-direction sectional view of the first transition block in the middle; Figure 16 for Figure 6 A schematic diagram of the structure of the second adapter block in the middle; Figure 17 for Figure 16 A cross-sectional view of the second transition block in the middle; Figure 18 This is a data curve diagram showing the adjustment of the solenoid valve pilot stage assembly according to an embodiment of the solenoid valve pilot stage assembly adjustment device of the present invention.

[0018] Figure label: 100. Frame; 101. Protective cover; 120. Receiving chamber; 130. First transfer block; 131. First transfer channel; 132. Third transfer channel; 140. Second transfer block; 141. Second transfer channel; 200, Sealing valve block; 210, First settling groove; 220, Second settling groove; 230, First flow channel; 240, Second flow channel; 250, Third flow channel; 260, Movable through hole; 310. Clamping drive component; 320. Clamping block; 400, push rod; 410, axial flow channel; 420, inlet radial through hole; 430, differential pressure radial through hole; 500. Drive mechanism; 600. Flow meter; 700. Differential pressure sensor; 810. Solenoid valve housing; 820. Adjusting sleeve; 821. Liquid inlet hole; 830. Valve sleeve; 831. Liquid outlet; 840. Coil. Detailed Implementation

[0019] The solenoid valve pilot stage assembly adjustment device and adjustment method of the present invention will be described below with reference to schematic diagrams, which illustrate preferred embodiments of the present invention. It should be understood that those skilled in the art can modify the present invention described herein while still achieving the advantageous effects of the present invention. Therefore, the following description should be understood as being of general knowledge to those skilled in the art and is not intended to limit the present invention.

[0020] The invention is described more specifically by way of example in the following paragraphs with reference to the accompanying drawings. The advantages and features of the invention will become clearer from the following description. It should be noted that the drawings are in a very simplified form and use non-precise proportions, and are only used to facilitate and clarify the illustration of the embodiments of the invention.

[0021] The inventors discovered that existing electronically controlled vibration dampers using ADC (Adaptive Damping Control) solenoid valves typically involve assembling the solenoid valves into an assembly first, and then testing the pressure-flow (PQ) characteristics of the assembly. However, due to factors such as manufacturing tolerances of parts, insufficient press-fitting repeatability of the servo press, deformation caused by interference fits, and springback after press-fitting, the overall valve's PQ characteristics exhibit significant variation, resulting in a limited range of consistent control and making it difficult to meet performance requirements.

[0022] To solve the above problems, the inventors creatively proposed to first adjust the pilot stage component of the solenoid valve to ensure that its pressure-flow characteristics meet the set requirements, and then assemble the solenoid valve into a complete assembly, thereby effectively improving the PQ consistency of the solenoid valve.

[0023] Before introducing the solenoid valve pilot stage assembly regulating device of this application, this application will first introduce the solenoid valve pilot stage assembly, such as... Figure 1 and Figure 2As shown, the solenoid valve pilot stage assembly includes a solenoid valve housing 810, a solenoid head assembly, an adjusting sleeve 820, and a valve sleeve 830. The solenoid head assembly and valve sleeve 830 are located inside the solenoid valve housing 810. The adjusting sleeve 820 is press-fitted into the valve sleeve 830. The adjusting sleeve 820 has three inlet holes 821 at its center, through which damper oil enters the solenoid valve. The valve sleeve 830 has an outlet notch on its outer circumference, forming an outlet 831 between the solenoid valve housing 810 and the valve sleeve 830. The damper oil inside the solenoid valve flows out from the outlet 831. Different positions of the adjusting sleeve 820 within the valve sleeve 830 result in different amounts and pressures of damper oil flowing through it, thus adjusting the overall valve's PQ capability. The solenoid valve pilot stage assembly also includes a coil 840, which energizes the solenoid valve. Different current values ​​result in different electromagnetic forces, thus affecting the adjustment range.

[0024] The following is in conjunction with the instruction manual appendix. Figure 3 To be continued Figure 18 The present invention describes the solenoid valve pilot stage assembly adjustment device and adjustment method.

[0025] like Figure 3 , Figure 4 and Figure 5 As shown, the solenoid valve pilot stage assembly adjustment device of this application includes a sealing valve block 200, a clamping mechanism, a push rod 400, a drive mechanism 500, a flow meter 600, a differential pressure sensor 700, and a controller, and also includes a frame 100, wherein the clamping mechanism, push rod 400, drive mechanism 500, flow meter 600, and differential pressure sensor 700 are arranged on the frame 100.

[0026] The sealing valve block 200 is used for sealing connection with the valve sleeve 830 of the pilot stage assembly of the solenoid valve, and has a fluid passage inside.

[0027] The clamping mechanism is used to clamp and fix the solenoid valve pilot stage assembly to the sealing valve block 200.

[0028] The push rod 400 is used to push against the adjusting sleeve 820 in the pilot stage assembly of the solenoid valve.

[0029] The drive mechanism 500 is used to drive the push rod 400 to move.

[0030] The flow meter 600 is connected to the fluid channel and is used to detect the fluid flow rate through the pilot stage assembly of the solenoid valve.

[0031] The differential pressure sensor 700 is connected to the fluid channel and is used to detect the pressure difference between the inlet and outlet of the solenoid valve pilot stage assembly.

[0032] The controller is connected to the flow meter 600, the differential pressure sensor 700, and the drive mechanism 500. The controller is configured to: maintain the differential pressure within a preset range based on the detection value of the differential pressure sensor 700, and acquire the detection value of the flow meter 600. When the detection value deviates from the preset target flow value, the controller controls the drive mechanism 500 to drive the push rod 400 to move until the detection value of the flow meter 600 reaches the target flow value.

[0033] This embodiment provides a solenoid valve pilot stage assembly adjustment device for adjusting and testing the fluid pressure and flow rate of the solenoid valve pilot stage assembly to ensure its performance meets design requirements. The device includes a frame 100, which serves as the basic support structure for the entire device, used to install and secure all other components. For example, the frame 100 can be a metal frame or a workbench, designed to provide sufficient rigidity and stability to withstand the weight of the components and the forces generated during operation. In some embodiments, the frame 100 is also equipped with a protective cover 101, which protects the clamping mechanism from interference from external debris.

[0034] A sealing valve block 200 is provided on the frame 100. This sealing valve block 200 is used to form a sealing connection with the valve sleeve 830 of the solenoid valve pilot stage assembly. The sealing valve block 200 has a fluid channel inside to guide the test fluid into and out of the pilot stage assembly and to ensure fluid tightness during the test.

[0035] To ensure that the solenoid valve pilot stage assembly is secured to the sealing valve block 200 during testing, the device also includes a clamping mechanism. This clamping mechanism presses and positions the pilot stage assembly onto the sealing valve block 200, preventing loosening or leakage under fluid pressure.

[0036] The device also includes a push rod 400, which is a movable rod component configured to directly push against the adjusting sleeve 820 inside the pilot stage assembly of the solenoid valve. By displacing the push rod, the position of the adjusting sleeve 820 is changed, thereby regulating the flow rate of the fluid flowing through the pilot stage assembly. One end of the push rod 400 contacts the adjusting sleeve 820, and the other end is connected to the drive mechanism 500.

[0037] The drive mechanism 500 is responsible for providing power to drive the push rod 400 to perform positioning and movement. This mechanism typically includes actuators such as motors, lead screws, or servo cylinders, and can achieve precise displacement control of the push rod 400.

[0038] To detect fluid flow rate, the device is equipped with a flow meter 600, which is connected to the fluid passage inside the sealing valve block 200. This flow meter 600 is used to detect the fluid flow rate through the solenoid valve pilot stage assembly, and its detected value serves as a basis for evaluating the performance of the pilot stage assembly. For example, the flow meter 600 can be a volumetric flow meter 600, installed in the fluid path.

[0039] The device also includes a differential pressure sensor 700, which is also connected to the fluid channel and is used to detect the fluid pressure difference between the inlet and outlet of the solenoid valve pilot stage assembly. This pressure difference is a parameter for maintaining stable fluid test conditions. For example, the differential pressure sensor 700 can be a differential pressure transmitter, with its two ends connected to the inlet and outlet 831 of the pilot stage assembly, respectively.

[0040] The controller is the core of the entire device, and it is connected to the flow meter 600, differential pressure sensor 700, and drive mechanism 500 via signal connections. The controller is configured to execute control logic: First, based on the pressure difference detected by the differential pressure sensor 700, the controller adjusts the external liquid supply system or internal valves to maintain the pressure difference within a preset range, ensuring consistent test conditions. Second, the controller continuously acquires the flow meter 600's detection value. When this flow rate deviates from the preset target flow rate value, the controller issues a command to control the drive mechanism 500 (e.g., by controlling a servo cylinder) to move the push rod 400. The movement of the push rod 400 changes the position of the adjusting sleeve 820, thereby adjusting the fluid flow rate until the flow rate detected by the flow meter 600 reaches the preset target flow rate value. For example, the controller can be a programmable logic controller (PLC) or an embedded microprocessor, running a preset control algorithm.

[0041] The solenoid valve pilot stage assembly adjustment device in this embodiment adjusts the adjusting sleeve 820 by controlling the movement of the push rod 400 during the pilot stage assembly stage before the solenoid valve assembly is assembled. Combined with the detection of the flow meter 600 and the differential pressure sensor 700 and the closed-loop adjustment of the controller, the pilot stage assembly is independently and dynamically adjusted for fluid pressure and flow to meet the requirements. This improves the consistency of the pressure-flow characteristics of each pilot stage assembly, making its PQ performance more stable and meeting the performance requirements. Based on the adjusted pilot stage assembly, the assembled solenoid valve has better PQ consistency, thus overcoming the problem of large PQ characteristic dispersion of solenoid valves caused by factors such as part tolerances and press-fit accuracy in traditional manufacturing.

[0042] Furthermore, in some of these embodiments, such as Figure 6 , Figure 7 and Figure 8As shown, the push rod 400 is a cylinder with an axial flow channel 410 inside. The side wall of the push rod 400 has a plurality of radial through holes 420 that communicate with the axial flow channel 410, which are used to allow fluid to enter the central hole of the push rod 400 and flow to the adjusting sleeve 820.

[0043] Specifically, the push rod 400 is constructed in a cylindrical shape. The cylindrical structure has good symmetry and stability, is easy to process and manufacture, and can achieve a good sealing fit with the movable through hole 260 in the sealing valve block 200, ensuring the sealing of the fluid during the regulation process.

[0044] An axial flow channel 410 is provided inside the push rod 400 along its axial direction. The axial flow channel 410 serves as the main channel for fluid inside the push rod 400, allowing the fluid to pass directly through the push rod 400 and avoiding the fluid from detouring around the outside of the push rod 400. This simplifies the fluid path and reduces fluid resistance.

[0045] Furthermore, the push rod 400 has multiple radial inlet holes 420 on its side wall, which are interconnected with the axial flow channel 410. These radial inlet holes are the entrances for fluid to enter the axial flow channel 410 inside the push rod 400 from the inlet channel of the sealing valve block 200. By providing multiple radial inlet holes, it can be ensured that the fluid can enter the push rod 400 evenly and fully, avoiding excessively high local flow rates or insufficient fluid supply, thereby ensuring the accuracy of fluid measurement and the stability of flow regulation.

[0046] Furthermore, in some of these embodiments, such as Figure 6 , Figure 8 and Figure 11 As shown, the sealing valve block 200 has an inlet channel and an outlet channel inside. The inlet radial through hole 420 of the push rod 400 is connected to the inlet channel. The sealing valve block 200 is also provided with a movable through hole 260 through which the push rod 400 passes and is sealed. The outlet channel is used to allow fluid flowing out from the outlet of the solenoid valve pilot stage assembly to flow out.

[0047] Specifically, the inlet and outlet channels within the sealing valve block 200 are key structures for guiding fluid into and out of the solenoid valve pilot stage assembly. The inlet channel is responsible for introducing external fluid into the inlet of the solenoid valve pilot stage assembly, while the outlet channel is responsible for collecting and discharging fluid flowing out of the solenoid valve pilot stage assembly. These channels are typically formed through precision machining (e.g., drilling, milling) on ​​the sealing valve block 200 body. Their geometry and dimensions are designed to ensure stable and smooth fluid flow, minimizing pressure loss and turbulence, thereby providing a stable fluid environment for subsequent flow and differential pressure detection.

[0048] The radial inlet orifice 420 of the push rod 400 is connected to the inlet channel of the sealing valve block 200, aiming to establish an effective fluid supply path from the sealing valve block 200 to the interior of the push rod 400 and then to the pilot stage assembly of the solenoid valve. This connection method requires that when the push rod 400 moves within the movable through-hole 260, its radial inlet orifice 420 can always maintain fluid communication with the inlet channel of the sealing valve block 200, or within the critical operating range.

[0049] The movable through-hole 260 provided on the sealing valve block 200 serves as a channel for the push rod 400 to move axially and push against the adjusting sleeve 820. The design of this movable through-hole 260 not only allows the push rod 400 to pass smoothly, but more importantly, it ensures a sealing fit between the push rod 400 and the movable through-hole 260. This sealing fit can be achieved by providing corresponding sealing grooves on the inner wall of the movable through-hole 260 or the outer wall of the push rod 400 and installing sealing elements (such as O-rings, U-rings, etc.). The selection of sealing elements must consider the fluid medium, working pressure, temperature, and the moving frequency and stroke of the push rod 400 to ensure that fluid does not leak from the inside of the sealing valve block 200 to the external environment during the movement of the push rod 400, thereby maintaining the stability of the system pressure and the accuracy of measurement.

[0050] The function of the liquid outlet channel is to efficiently collect and guide the fluid flowing out from the outlet of the solenoid valve pilot stage assembly. After the solenoid valve pilot stage assembly is pressed and fixed to the sealing valve block 200, its outlet end will form a sealed connection with the liquid outlet channel inside the sealing valve block 200.

[0051] Furthermore, in some of these embodiments, such as Figure 4 , Figure 5 and Figure 6 As shown, the frame 100 is also provided with a receiving chamber 120, the sealing valve block 200 is arranged in the receiving chamber 120, and the receiving chamber 120 is also provided with a transfer assembly. The flow meter 600 and the differential pressure sensor 700 are both connected to the sealing valve block 200 through the transfer assembly. The transfer assembly includes a first transfer block 130 and a second transfer block 140. The first transfer block 130 has a first transfer channel 131 for connecting to the liquid inlet channel, and the flow meter 600 communicates with the first transfer channel 131. The second transfer block 140 has a second transfer channel 141 for connecting to the liquid outlet channel.

[0052] Specifically, the receiving chamber 120 may be a groove pre-machined on the frame 100 or an independent shell attached to the frame 100. Its main function is to provide a protected and structurally stable installation environment for the internal components.

[0053] The sealing valve block 200 is arranged in the receiving chamber 120 so that it can be effectively supported and protected by the frame 100, while providing centralized space for subsequent pipeline and sensor connections.

[0054] The function of the adapter assembly is to integrate the flow meter 600 and differential pressure sensor 700, which would otherwise require multiple independent pipeline connections, with the fluid passage of the sealing valve block 200, thereby simplifying the fluid circuit. Both the flow meter 600 and the differential pressure sensor 700 are connected to the sealing valve block 200 via this adapter assembly. This connection method avoids complex pipeline connections between the flow meter 600 and the differential pressure sensor 700 and the sealing valve block 200, reducing connection difficulty and potential leakage risks.

[0055] The adapter assembly includes a first adapter block 130 and a second adapter block 140, which can respectively handle the connection between the inlet and outlet fluid paths. For example, the first adapter block 130 can be used to introduce an external fluid source into the flow meter 600 and the differential pressure sensor 700, and finally into the inlet channel of the sealing valve block 200; the second adapter block 140 is responsible for leading out the fluid flowing out of the sealing valve block 200. They can employ different materials or structural designs to adapt to the characteristics of their respective fluid paths. Figure 6 , Figure 12 and Figure 15 As shown, the first adapter block 130 has a first adapter channel 131 for connection with the inlet channel. This channel is the initial path for fluid to enter the device, ensuring that fluid can be accurately introduced from the external interface into the inlet channel of the sealing valve block 200, and measured by the flow meter 600 and the differential pressure sensor 700 in the process. Figure 6 , Figure 16 and Figure 17 As shown, the second adapter block 140 has a second adapter channel 141 for connection with the liquid outlet channel. This channel is the final path for the fluid to leave the device, ensuring that the fluid can be accurately discharged from the liquid outlet channel of the sealing valve block 200 to the outside, and may also pass through the measuring components.

[0056] Through the above technical solution, the sealing valve block 200 is arranged in the receiving chamber 120 on the frame 100, and an adapter assembly is introduced, allowing the flow meter 600 and the differential pressure sensor 700 to be connected to the inlet and outlet channels of the sealing valve block 200 through this adapter assembly. This design effectively simplifies the connection pipeline between the fluid measurement components and the core valve block, reduces the number and length of external pipelines, thereby making the device structure more compact and more integrated.

[0057] Furthermore, in some of these embodiments, such as Figure 6 , Figure 9 , Figure 10and Figure 11 As shown, the sealing valve block 200 is provided with a first settling groove 210 and a second settling groove 220 arranged in opposite directions. The sealing valve block 200 is also provided with a first flow channel 230 and a second flow channel 240. The first flow channel 230 is connected to the first settling groove 210 and the two together constitute the liquid inlet channel. The second flow channel 240 is connected to the second settling groove 220 and the two together constitute the liquid outlet channel.

[0058] Specifically, the first recess 210 and the second recess 220 inside the sealing valve block 200 are groove structures for accommodating and guiding fluid. These recesses can be formed at specific locations on the sealing valve block 200 using various processing methods such as milling, drilling, casting, or 3D printing. Their "back-to-back arrangement" means that the first recess 210 and the second recess 220 are located opposite each other on the surface of the sealing valve block 200. This layout helps to effectively isolate the inlet and outlet fluids in space, avoiding mutual interference or short-circuiting between fluids, thereby ensuring the directionality and stability of fluid flow. At the same time, the back-to-back arrangement also provides a flexible and clear interface for the connection of subsequent flow channels.

[0059] The sealing valve block 200 is also provided with a first flow channel 230 and a second flow channel 240, which are specific passages inside the sealing valve block 200 for fluid transmission. The first flow channel 230 is responsible for introducing external fluid into the sealing valve block 200, while the second flow channel 240 is responsible for discharging fluid out of the sealing valve block 200. They are the core structures for achieving directional fluid transmission, ensuring that the fluid can flow efficiently and accurately within the system.

[0060] The first flow channel 230 is connected to the first settling tank 210, and the two together constitute the liquid inlet channel. This means that the liquid inlet channel is not a single channel, but a composite structure formed by the first flow channel 230 and the first settling tank 210. Specifically, the first flow channel 230 connects the external liquid supply line to the first settling tank 210 inside the sealing valve block 200. The first settling tank 210 acts as a buffer or distribution chamber, receiving fluid from the first flow channel 230. This design allows the fluid to undergo preliminary pressure equalization and flow rate stabilization in a relatively spacious area before entering the solenoid valve pilot stage assembly, providing a more uniform fluid supply to the radial through-hole 420 of the push rod 400, thereby optimizing the conditions for fluid to enter the solenoid valve pilot stage assembly.

[0061] Similarly, the second flow channel 240 is connected to the second settling tank 220, and the two together constitute the liquid outlet channel, which is also a composite structure formed by the second flow channel 240 and the second settling tank 220. The second settling tank 220 is used to collect and gather the fluid flowing out of the solenoid valve pilot stage assembly outlet. Subsequently, the second flow channel 240 guides this fluid gathered in the second settling tank 220 to the drain line outside the sealing valve block 200. This design helps ensure smooth discharge of fluid from the solenoid valve pilot stage assembly, reduces back pressure at the outlet, and avoids fluid stagnation or backflow inside the sealing valve block 200, thereby maintaining the stability of the system fluid pressure.

[0062] Furthermore, in some of these embodiments, such as Figure 6 and Figure 11 As shown, the sealing valve block 200 is also provided with a third flow channel 250 extending to the movable through hole 260. The third flow channel 250 is located between the first settling tank 210 and the second settling tank 220. The side wall of the push rod 400 is also provided with a differential pressure radial through hole 430 communicating with the axial flow channel 410. One end of the third flow channel 250 is connected to one end of the differential pressure sensor 700, and the other end is connected to the differential pressure radial through hole 430. The other end of the differential pressure sensor 700 is connected to the liquid outlet channel.

[0063] Specifically, the third flow channel 250 inside the sealing valve block 200 is a channel specifically designed for differential pressure measurement. The side wall of the push rod 400 is provided with a differential pressure radial through hole 430 that communicates with the axial flow channel 410. The differential pressure radial through hole 430 is an inlet on the push rod 400 specifically used to receive fluid from the third flow channel 250. They are connected to the axial flow channel 410 inside the push rod 400, so that the differential pressure measurement flow channel is relatively independent from the liquid inlet channel and the liquid outlet channel, which can accurately obtain the pressure of the fluid in the axial flow channel 410 inside the push rod 400, and thus obtain the differential pressure more accurately.

[0064] Preferably, such as Figure 12 , Figure 13 and Figure 14 As shown, the first adapter block 130 also has a third adapter channel 132. One end of the third flow channel 250 is connected to the third adapter channel 132, and the other end is connected to the differential pressure radial through hole 430. One end of the differential pressure sensor 700 is connected to the third adapter channel 132. Through the first adapter block 130, the number and length of external pipelines can be further reduced, thereby making the device structure more compact and more integrated.

[0065] Furthermore, in some embodiments, the clamping mechanism includes a clamping drive 310 and a clamping block 320, the clamping drive 310 being disposed on the frame 100, and the clamping block 320 being disposed at the output end of the clamping drive 310.

[0066] Specifically, the clamping drive 310 is an actuating component that provides clamping force. It can take various forms, such as a cylinder, hydraulic cylinder, electric push rod 400, or a motor with screw drive, etc. Its core function is to generate controllable thrust or pull force. The clamping drive 310 is firmly mounted on the frame 100 of the device to ensure that it has sufficient support rigidity and stability during operation, avoiding the clamping effect from its own shaking or displacement. The pressure block 320 is a component that directly contacts the solenoid valve pilot stage assembly and applies clamping force. It is usually made of a material with a certain degree of hardness and wear resistance, such as metal or high-strength engineering plastic. The pressure block 320 is arranged at the output end of the clamping drive 310, which means that the force or displacement generated by the clamping drive 310 will be directly transmitted to the solenoid valve pilot stage assembly through the pressure block 320, achieving effective fixation of the assembly.

[0067] The following example will provide a more detailed explanation of the above technical solution: In this embodiment, the sealing valve block 200 is made of steel with a chrome-plated surface for rust prevention. Its dimensions (length × width × height) are 175 × 130 × 60 mm. Internally, it includes a first recess 210, a second recess 220, a movable through hole 260, a first flow channel 230, a second flow channel 240, and a third flow channel 250. A sealing ring is placed in the first recess 210 for sealing engagement with the valve sleeve 830 of the solenoid valve.

[0068] The clamping block 320 of the clamping mechanism cooperates with the end of the housing of the solenoid valve pilot stage assembly. The clamping mechanism applies a force of 2800N to prevent the solenoid valve pilot stage assembly from being lifted and loosened by the lower end during the test. The solenoid valve pilot stage assembly can be equipped with a quick clamp consisting of a coil 840 and tooling to meet the testing of various models of coil 840.

[0069] The drive mechanism 500 can be a PROMESS precision servo press with a minimum walking step of 0.001mm. In conjunction with a displacement sensor, the precision press can send a driving force signal to the controller, and the displacement sensor can send a displacement signal to the controller, thus interacting with the controller in real time.

[0070] The push rod 400 is a cylinder with an outer diameter of 6 mm and an internal axial flow channel 410 with a diameter of 2.5 mm. At a distance of 22 mm from the end of the push rod 400, four radial through holes 420 with a diameter of 1.5 mm are provided on the side, which are connected to the axial flow channel 410. The damper oil in the sealing valve block 200 can enter the axial flow channel 410 at the center of the push rod 400 through the radial through holes 420, and then enter the solenoid valve adjusting sleeve 820.

[0071] The flow meter 600 can be selected as the German VSE VS0.04 model, with an accuracy of ±0.3% of the reading and a minimum readable data of 0.01L / min.

[0072] The differential pressure sensor 700 can be selected from DRUCK's PMP50G3-TB-A3-CA-H0-PA product, with an accuracy of 0.1% (meeting 7-10±0.1 bar) and a response time of 2.5ms (400Hz).

[0073] Taking the target flow rate of 1.33 ± 0.04 L / min as an example, if... Figure 18 As shown, when a 600mA current is input to the coil 840, under a stable pressure difference, the displacement of the servo press is controlled to push the push rod 400, which can adjust the flow rate of the solenoid valve pilot stage component to the target flow rate range, thereby completing the adjustment of the solenoid valve pilot stage component.

[0074] In some embodiments, this application also provides a method for adjusting a solenoid valve pilot stage assembly, comprising: The pilot stage assembly of the solenoid valve is fixed to the solenoid valve pilot stage assembly adjustment device as described in any of the above technical solutions, and the push rod 400 is aligned with the adjustment sleeve 820 in the solenoid valve pilot stage assembly. Fluid is introduced into the pilot stage assembly of the solenoid valve, and the pressure difference between the inlet and outlet of the solenoid valve pilot stage assembly is monitored by the differential pressure sensor 700, and the pressure difference is maintained within a preset range. The flow rate of fluid flowing through the pilot stage assembly of the solenoid valve is monitored in real time using a flow meter 600. The control drive mechanism 500 drives the push rod 400 to adjust the fluid flow rate through the pilot stage assembly of the solenoid valve until the monitored flow rate value reaches the preset target flow rate range.

[0075] The solenoid valve pilot stage assembly adjustment method of this embodiment adjusts the adjusting sleeve 820 by controlling the movement of the push rod 400 during the solenoid valve pilot stage assembly stage before the solenoid valve assembly is assembled. Combined with the detection of the flow meter 600 and the differential pressure sensor 700 and the closed-loop adjustment of the controller, the pilot stage assembly is independently and dynamically adjusted for fluid pressure and flow to meet the requirements. This improves the consistency of the pressure-flow characteristics of each pilot stage assembly, stabilizes its PQ performance, and meets the performance requirements.

[0076] This method first ensures stable differential pressure to eliminate the impact of pressure fluctuations on flow rate testing. Then, based on the flow rate detection value, the position of the push rod 400 is adjusted in real time. The cross-sectional area of ​​the fluid channel is precisely controlled by fine-tuning the adjusting sleeve 820, allowing the flow rate to quickly converge to the target value. This strategy of independently closed-loop adjusting the pilot stage component before final assembly avoids the additional variables introduced by assembly in traditional methods. Based on the adjusted pilot stage component, the assembled solenoid valve has better PQ consistency, thus overcoming the problem of large PQ characteristic dispersion of solenoid valves caused by factors such as part tolerances and press-fit accuracy in traditional manufacturing.

[0077] Furthermore, in some embodiments, when the detected flow rate value deviates from the target flow rate value by more than a preset deviation threshold, the drive mechanism 500 pushes the push rod 400 with a first step distance; when the detected flow rate value deviates from the target flow rate value by no more than the preset deviation threshold, the drive mechanism 500 switches to pushing the push rod 400 with a second step distance, wherein the first step distance is greater than the second step distance, and the second step distance is a micrometer-level step distance.

[0078] Specifically, the preset deviation threshold is a boundary used to judge the degree of deviation between the current flow rate value and the target flow rate value. Its setting needs to comprehensively consider the actual adjustment accuracy requirements and the dynamic response characteristics of the system to distinguish between coarse adjustment and fine adjustment stages. The first step distance refers to the displacement of the push rod 400 each time the drive mechanism 500 pushes it during coarse adjustment. Since the flow rate value deviates significantly from the target value at this time, the first step distance is usually set to a relatively large value, such as millimeters or sub-millimeters, to quickly shorten the gap between the flow rate value and the target value and improve adjustment efficiency.

[0079] The drive mechanism 500 is preferably the servo electric cylinder, which typically consists of a servo motor and a lead screw mechanism. It enables high-precision, controllable linear displacement and is responsible for precisely pushing the push rod 400, thereby adjusting the adjusting sleeve 820 in the pilot stage assembly of the solenoid valve. The second step distance refers to the displacement of the push rod 400 each time the drive mechanism 500 performs fine adjustments. When the flow rate is close to the target value and the deviation is within a preset deviation threshold, a smaller step distance is needed for fine-tuning to avoid overshoot and ensure the final flow rate is accurate and stable. The second step distance is explicitly defined as a micrometer-level step distance, reflecting its high-precision characteristics and enabling extremely fine adjustments to the flow rate. The relationship between the first step distance and the second step distance clarifies the logic of coarse and fine adjustments: a larger first step distance quickly approaches the target, and a smaller second step distance precisely locks onto the target, thus balancing adjustment efficiency and accuracy.

[0080] Through the above technical solution, this application introduces a segmented step adjustment strategy. The step distance of the drive mechanism 500 pushing the push rod 400 is dynamically switched according to the deviation of the flow rate from the target value, significantly improving the efficiency and accuracy of flow adjustment in the solenoid valve pilot stage component. When there is a large deviation between the flow rate and the target value, a larger first step distance is used for rapid coarse adjustment, quickly bringing the flow rate closer to the target range and significantly shortening the overall adjustment time. Once the flow rate enters the preset deviation threshold, the system automatically switches to a micron-level second step distance for fine adjustment, effectively avoiding overshoot caused by excessive step distance and ensuring that the flow rate remains extremely stable within the preset target flow range. This strategy combining coarse and fine adjustment not only improves the automation and efficiency of the assembly process but also guarantees the final accuracy of flow regulation in the solenoid valve pilot stage component, thereby improving product performance and reliability.

[0081] Furthermore, in some embodiments, the solenoid valve pilot stage assembly is run-in before being fixed to the solenoid valve pilot stage assembly adjustment device described in any of the above technical solutions.

[0082] Specifically, before fixing the solenoid valve pilot stage assembly to the fluid pressure regulating device for precise flow adjustment, it must first undergo a run-in process. Run-in refers to pre-running the solenoid valve pilot stage assembly under controlled conditions for a certain period of time to eliminate initial assembly stress between its internal moving parts (such as the valve core and valve sleeve 830), break in the mating surfaces, and flush away any possible minor impurities, thereby stabilizing the mechanical properties and fluid characteristics of the assembly. For example, the solenoid valve pilot stage assembly can be connected to a simple fluid circuit, supplied with clean fluid, and operated at low pressure and flow rate for a period of time, or subjected to a certain number of switching cycles. The run-in duration, fluid pressure, and flow rate parameters can be set according to the specific design requirements and empirical data of the solenoid valve, aiming to provide a more stable and predictable basis for subsequent precise flow adjustment.

[0083] Obviously, those skilled in the art can make various modifications and variations to this invention without departing from its spirit and scope. Therefore, if these modifications and variations fall within the scope of the claims of this invention and their equivalents, this invention also intends to include these modifications and variations.

Claims

1. A solenoid valve pilot stage assembly adjustment device, characterized in that, include: A sealing valve block is used for sealing connection with the valve sleeve of the pilot stage assembly of the solenoid valve, and has a fluid passage inside. A clamping mechanism is used to clamp and fix the solenoid valve pilot stage assembly to the sealing valve block; The push rod is used to push against the adjusting sleeve in the pilot stage assembly of the solenoid valve; A drive mechanism is used to drive the push rod to move; A flow meter, connected to the fluid channel, is used to detect the flow rate of fluid passing through the pilot stage assembly of the solenoid valve; A differential pressure sensor, connected to the fluid channel, is used to detect the pressure difference between the inlet and outlet of the solenoid valve pilot stage assembly; The controller is connected to the flow meter, the differential pressure sensor and the drive mechanism. The controller is configured to: maintain the differential pressure within a preset range according to the detection value of the differential pressure sensor, and acquire the detection value of the flow meter. When the detection value deviates from the preset target flow value, the controller controls the drive mechanism to drive the push rod to move until the detection value of the flow meter reaches the target flow value. The push rod is a cylinder with an axial flow channel inside. Multiple radial through holes for liquid inlet are opened on the side wall of the push rod and communicate with the axial flow channel, so that the fluid enters the central hole of the push rod and flows to the adjusting sleeve. The sealing valve block is provided with an inlet channel and an outlet channel. The radial through hole of the push rod is connected to the inlet channel. The sealing valve block is also provided with a movable through hole through which the push rod passes and is sealed. The outlet channel is used to allow fluid flowing out from the outlet of the solenoid valve pilot stage assembly. It also includes a receiving chamber, in which the sealing valve block is arranged. A transition assembly is also arranged in the receiving chamber. The flow meter and the differential pressure sensor are both connected to the sealing valve block through the transition assembly. The transition assembly includes a first transition block and a second transition block. The first transition block has a first transition channel for connecting to the inlet channel, and the flow meter communicates with the first transition channel. The second transition block has a second transition channel for connecting to the outlet channel. The sealing valve block is provided with a first settling groove and a second settling groove arranged in opposite directions. The sealing valve block is also provided with a first flow channel and a second flow channel. The first flow channel is connected to the first settling groove and the two together constitute the liquid inlet channel. The second flow channel is connected to the second settling groove and the two together constitute the liquid outlet channel. The sealing valve block is also provided with a third flow channel extending to the movable through hole. The third flow channel is located between the first settling tank and the second settling tank. The first adapter block also has a third adapter channel. The side wall of the push rod is also provided with a differential pressure radial through hole communicating with the axial flow channel. One end of the third flow channel is connected to one end of the differential pressure sensor, and the other end is connected to the differential pressure radial through hole. The other end of the differential pressure sensor is connected to the liquid outlet channel.

2. The solenoid valve pilot stage assembly adjustment device according to claim 1, characterized in that, The clamping mechanism includes a clamping drive and a clamping block, with the clamping block arranged at the output end of the clamping drive.

3. A method for adjusting a pilot stage assembly of a solenoid valve, characterized in that, include: The pilot stage assembly of the solenoid valve is fixed to the solenoid valve pilot stage assembly adjustment device as described in claim 1 or 2, and the push rod is aligned with the adjustment sleeve in the solenoid valve pilot stage assembly. Fluid is introduced into the pilot stage assembly of the solenoid valve, and the pressure difference between the inlet and outlet of the solenoid valve pilot stage assembly is monitored by a differential pressure sensor to maintain the pressure difference within a preset range. The flow rate of fluid passing through the pilot stage assembly of the solenoid valve is monitored in real time using a flow meter. The control drive mechanism drives the push rod to adjust the fluid flow rate through the pilot stage assembly of the solenoid valve until the monitored flow rate value reaches the preset target flow rate range.

4. The method for adjusting the pilot stage assembly of the solenoid valve according to claim 3, characterized in that, When the detected flow rate deviates from the target flow rate by more than a preset deviation threshold, the drive mechanism pushes the push rod with a first step distance; when the detected flow rate deviates from the target flow rate by no more than the preset deviation threshold, the drive mechanism switches to pushing the push rod with a second step distance, wherein the first step distance is greater than the second step distance, and the second step distance is a micrometer-level step distance.

5. The method for adjusting the pilot stage assembly of the solenoid valve according to claim 3, characterized in that, Before fixing the solenoid valve pilot stage assembly to the solenoid valve pilot stage assembly adjustment device as described in claim 1 or 2, the solenoid valve pilot stage assembly is first run-in.

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