High stability proportional solenoid valve

Abstract

The utility model discloses a high stability proportional solenoid valve belongs to solenoid valve technical field, including valve body module, electromagnetic drive module, heat compensation module and dynamic voltage stabilizing module, the valve body module includes valve body, the valve sleeve valve core of pressure equipment in valve body front end hole to and is connected in valve body rear end face rear end cover, the electromagnetic drive module includes the magnetic conducting sleeve, the coil assembly of installation in the magnetic conducting sleeve to and drive valve core's push rod, the magnetic conducting sleeve front end is pressed into valve body middle hole, and the rear end is fixed through the flange bolt, the compensation ring of heat compensation module is in the excess of the magnetic conducting sleeve outer wall, the dynamic voltage stabilizing module includes the voltage stabilizing piston of being located in the blind hole of valve core tail part, the voltage stabilizing spring of top pressure piston to and the adjusting screw of adjusting spring pre -tightness. The present application offsets the thermal deformation of the magnetic conducting sleeve through the heat compensation module, and the dynamic voltage stabilizing module continuously absorbs the fluctuation of oil back pressure to make the output flow smooth and non-pulsating, and keeps the high stability of proportional control.

Description

Technical Field

[0001] This utility model belongs to the field of electromagnetic valve technology, specifically relating to a high-stability proportional electromagnetic valve. Background Technology

[0002] Existing proportional solenoid valves generally exhibit the following defects under high temperature and high pressure differential conditions: First, the coil and magnetic sleeve elongate axially with the temperature rise, causing the valve core to drift at zero position and the control accuracy to drop sharply; Second, the valve core is easily subjected to the impact of radial unbalanced hydraulic force and return oil back pressure fluctuation, which can easily generate vibration, noise, or even jamming; Third, the integral magnetic sleeve has large eddy current losses and limited response frequency.

[0003] To address these issues, the industry often employs measures such as external cooling and increased spring stiffness. However, these methods are complex, energy-intensive, and cannot completely eliminate thermal drift and hydraulic disturbances. Therefore, there is an urgent need for a new type of proportional solenoid valve with built-in thermal compensation, dynamic pressure regulation, and eddy current suppression functions to maintain long-term stability of proportional characteristics under wide temperature range and high load conditions. Summary of the Invention

[0004] To address the aforementioned issues, this utility model discloses a highly stable proportional solenoid valve, which uses a thermal compensation module to offset the thermal deformation of the magnetic sleeve; and a dynamic pressure stabilizing module to continuously absorb back pressure fluctuations in the return oil, ensuring a stable and pulsation-free output flow and maintaining high stability in proportional control.

[0005] To achieve the above objectives, the specific technical solution of this application is as follows:

[0006] A highly stable proportional solenoid valve includes a valve body module, an electromagnetic drive module, a thermal compensation module, and a dynamic pressure regulating module.

[0007] The valve body module includes a valve body, a valve sleeve and valve core press-fitted into the front end hole of the valve body, and a rear end cover connected to the rear end face of the valve body.

[0008] The electromagnetic drive module includes a magnetic sleeve, a coil assembly installed inside the magnetic sleeve, and a push rod for driving the valve core; the front end of the magnetic sleeve is press-fitted into the middle hole of the valve body, and the rear end is fixed by flange bolts.

[0009] The compensation ring of the thermal compensation module is interference-fitted onto the outer wall of the magnetic sleeve, with its two end faces abutting against the flange and the stepped surface of the valve body, respectively.

[0010] The dynamic pressure stabilizing module includes a pressure stabilizing piston located in a blind hole at the tail of the valve core, a pressure stabilizing spring for the top piston, and an adjusting screw for adjusting the preload of the spring; the adjusting screw is threadedly connected to the central screw hole of the rear end cover.

[0011] The valve body is provided with an oil inlet channel, an oil return channel and a working channel that are isolated from each other; the outer wall of the valve sleeve is provided with three annular grooves: the oil inlet groove near the front end is connected to the oil inlet channel opening, the middle working groove is connected to the working channel opening, and the tail oil return groove is connected to the oil return channel opening; the guide section of the inner hole of the valve sleeve is provided with a double-headed spiral oil groove.

[0012] Based on the above technical features, the compensation ring is further described as a bimetallic composite structure comprising a titanium alloy substrate layer and a copper-tungsten alloy compensation layer; the copper-tungsten alloy compensation layer is brazed to the inner wall of the substrate layer; and the axial height of the compensation ring is equal to the length of the magnetic sleeve.

[0013] Based on the above technical features, the magnetic sleeve is further composed of a soft iron section and an eddy current suppression section coaxially welded together; the silicon steel sheet laminate of the eddy current suppression section is coated with epoxy insulating varnish between the sheets; the axial length of the laminate is equal to the width of the winding area of ​​the coil frame, and both ends are fixed to the soft iron section.

[0014] Based on the above technical features, preferably, the valve core has a three-shoulder structure, with the middle shoulder fitting with the valve sleeve guide hole; a pressure-stabilizing blind hole is opened at the tail of the valve core, and the bottom hole of the hole connects to the return oil channel; the displacement sensor moving iron core is press-fitted into the center hole at the front end of the valve core.

[0015] Based on the above technical features, preferably, the front end of the pressure stabilizing piston has a 60° cone angle, and the rear end is provided with a spring countersunk hole; the pressure stabilizing spring is a variable pitch spring, with the large pitch end connected to the adjusting screw and the small pitch end embedded in the piston countersunk hole; the cone surface of the pressure stabilizing piston and the inner wall of the valve core blind hole form an annular damping gap.

[0016] Based on the above technical features, furthermore, the stator coil of the displacement sensor is embedded in the inner hole of the valve sleeve and fixed by epoxy resin potting; the sensor signal line passes through the waterproof joint on the side wall of the valve sleeve; and the iron core is press-fitted into the blind hole at the front end of the valve core.

[0017] Compared with the prior art, the beneficial effects of this application are as follows:

[0018] This application utilizes a thermal compensation module to automatically offset the thermal deformation of the magnetic sleeve, eliminating zero-position drift; a dynamic pressure stabilizing module continuously absorbs back pressure fluctuations in the return oil, ensuring a stable and pulsation-free output flow; a segmented magnetic sleeve suppresses eddy currents, significantly improving response sensitivity; a three-shouldered valve core and a spiral oil groove form dynamic pressure lubrication, effectively reducing friction and wear; and a closed-loop displacement structure enables long-term calibration-free operation. The overall structure is compact and reliable, maintaining high stability of proportional control over extended periods under wide temperature ranges and high pressure differential conditions. Attached Figure Description

[0019] Figure 1 This is a schematic diagram of the structure of a high-stability proportional solenoid valve according to the present invention;

[0020] Figure 2This is a schematic cross-sectional view of the compensation module in this utility model;

[0021] List of identifiers in attached diagrams:

[0022] Valve body module; 101, valve body; 102, valve sleeve; 103, valve core; 104, rear end cover;

[0023] Electromagnetic drive module; 201, magnetic sleeve; 202, coil assembly; 203, push rod;

[0024] Thermal compensation module; 301, compensation ring; 3011, copper-tungsten alloy compensation layer; 3012, titanium alloy substrate layer;

[0025] Dynamic voltage regulator module; 401, voltage regulator piston; 402, voltage regulator spring; 403, adjusting screw;

[0026] P, oil inlet channel; T, oil return channel; A, working channel; 5, displacement sensor. Detailed Implementation

[0027] The present invention will be further illustrated below with reference to the accompanying drawings and specific embodiments. It should be understood that the following specific embodiments are for illustrative purposes only and are not intended to limit the scope of the invention.

[0028] It should be noted that the terms "upper," "lower," "left," "right," "front," and "rear" used in the following description refer to the directions shown in the accompanying drawings, while the terms "inner" and "outer" refer to directions toward or away from the geometric center of a specific component, respectively. Furthermore, the terms "installation," "connection," and "joining" should be interpreted broadly. For example, they can refer to fixed connections, detachable connections, or integral connections; they can refer to mechanical connections or electrical connections; they can refer to direct connections or indirect connections through an intermediate medium; and they can refer to the internal connection between two components. Those skilled in the art can understand the specific meaning of the above terms in this utility model based on the specific circumstances.

[0029] like Figure 1 As shown, a high-stability proportional solenoid valve includes a valve body module 1, an electromagnetic drive module 2, a thermal compensation module 3, and a dynamic pressure stabilizing module 4.

[0030] The valve body module 1 includes a valve body 101, a valve sleeve 102 press-fitted into the front end hole of the valve body, a valve core 103, and a rear end cover 104 connected to the rear end face of the valve body.

[0031] The electromagnetic drive module 2 includes a magnetic sleeve 201, a coil assembly 202 installed inside the magnetic sleeve, and a push rod 203 for driving the valve core; the front end of the magnetic sleeve 201 is press-fitted into the middle hole of the valve body 101, and the rear end is fixed by flange bolts;

[0032] The compensation ring 301 of the thermal compensation module 3 is interference-fitted onto the outer wall of the magnetic sleeve 201, with its two end faces abutting against the flange and the stepped surface of the valve body 101, respectively.

[0033] The dynamic pressure stabilizing module 4 includes a pressure stabilizing piston 401 located in the blind hole at the tail of the valve core, a pressure stabilizing spring 402 for the top piston, and an adjusting screw 403 for adjusting the preload of the spring; the adjusting screw 403 is threaded to the central screw hole of the rear cover 104.

[0034] The valve body 101 is provided with an oil inlet channel P, an oil return channel T, and a working channel A that are isolated from each other; the outer wall of the valve sleeve 102 is provided with three annular grooves: the oil inlet groove near the front end is connected to the oil inlet channel P, the middle working groove is connected to the working channel A, and the tail oil return groove is connected to the oil return channel T; the inner guide section of the valve sleeve 102 is provided with a double-headed spiral oil groove.

[0035] The compensation ring 301 is a bimetallic composite structure comprising a titanium alloy substrate layer 3012 and a copper-tungsten alloy compensation layer 3011; the copper-tungsten alloy compensation layer 3011 is welded to the inner wall of the titanium alloy substrate layer 3012; the axial height of the compensation ring 301 is equal to the length of the magnetic sleeve.

[0036] The magnetic sleeve 201 is composed of a soft iron section and an eddy current suppression section coaxially welded together; the eddy current suppression section is a silicon steel sheet laminate with epoxy insulating varnish between the sheets; the axial length of the steel sheet laminate is equal to the width of the winding area of ​​the coil frame, and both ends are fixed to the soft iron section.

[0037] The valve core 103 has a three-shoulder structure, with the middle shoulder fitting with the valve sleeve guide hole; a pressure-stabilizing blind hole is opened at the tail of the valve core, and the bottom hole is connected to the return oil channel T; the displacement sensor 5 moving iron core is press-fitted into the center hole at the front end of the valve core.

[0038] The pressure-stabilizing piston 401 has a 60° cone angle at the front end and a spring countersunk hole at the rear end; the pressure-stabilizing spring is a variable pitch spring, with the large pitch end connected to the adjusting screw and the small pitch end embedded in the piston countersunk hole; the cone surface of the pressure-stabilizing piston and the inner wall of the valve core blind hole form an annular damping gap.

[0039] The stator coil of the displacement sensor 5 is embedded in the inner hole of the valve sleeve and fixed by epoxy resin potting; the sensor signal line passes through the waterproof joint on the side wall of the valve sleeve; the iron core is press-fitted into the blind hole at the front end of the valve core.

[0040] Working principle

[0041] Power-driven operation: The coil assembly is energized → the push rod pushes the valve core to the left → the middle shoulder opens the P → A oil circuit; the displacement sensor 5 provides real-time feedback on the valve core position, forming a closed-loop control.

[0042] Thermal compensation process: Temperature rises → magnetic sleeve 201 expands to increase magnetic gap → copper-tungsten alloy compensation layer 3011 compresses magnetic sleeve 201 with greater expansion → maintaining constant magnetic gap.

[0043] Pressure stabilization process: When the pressure at port A suddenly increases, the oil enters the pressure stabilizing chamber through the valve core through hole. The pressure stabilizing piston 401 moves to the right and compresses the pressure stabilizing spring 402. The conical surface gap increases, accelerating the pressure relief. The conical pressure stabilizing piston and the variable pitch pressure stabilizing spring constitute a hydraulic damper.

[0044] In summary, this application utilizes a thermal compensation module to automatically offset the thermal deformation of the magnetic sleeve, eliminating zero-position drift; a dynamic pressure stabilizing module continuously absorbs back pressure fluctuations in the return oil, ensuring a stable and pulsation-free output flow; a segmented magnetic sleeve suppresses eddy currents, significantly improving response sensitivity; a three-shouldered valve core and a spiral oil groove form dynamic pressure lubrication, effectively reducing friction and wear; and a closed-loop displacement structure enables long-term calibration-free operation. The overall structure is compact and reliable, maintaining high stability of proportional control over extended periods under wide temperature ranges and high pressure differential conditions.

[0045] It should be noted that the accompanying drawings merely illustrate the technical concept of the present invention and should not be used to limit the scope of protection of the present invention. For those skilled in the art, several improvements and modifications can be made without departing from the principle of the present invention, and all such improvements and modifications fall within the scope of protection of the claims of the present invention.

Claims

1. A high-stability proportional solenoid valve, characterized in that: It includes a valve body module, an electromagnetic drive module, a thermal compensation module, and a dynamic voltage regulator module; The valve body module includes a valve body, a valve sleeve press-fitted into the front end hole of the valve body, a valve core, and a rear end cover connected to the rear end face of the valve body. The electromagnetic drive module includes a magnetic sleeve, a coil assembly installed inside the magnetic sleeve, and a push rod that drives the valve core; the front end of the magnetic sleeve is press-fitted into the middle hole of the valve body, and the rear end is fixed by flange bolts; The compensation ring of the thermal compensation module is interference-fitted onto the outer wall of the magnetic sleeve, with its two end faces abutting against the flange and the stepped surface of the valve body, respectively. The dynamic pressure stabilizing module includes a pressure stabilizing piston located in a blind hole at the tail of the valve core, a pressure stabilizing spring for the top piston, and an adjusting screw for adjusting the preload of the spring; the adjusting screw is threadedly connected to the central screw hole of the rear end cover.

2. The high-stability proportional solenoid valve according to claim 1, characterized in that: The valve body is provided with an oil inlet channel, an oil return channel and a working channel that are isolated from each other; the outer wall of the valve sleeve is provided with three annular grooves: the oil inlet groove near the front end is connected to the oil inlet channel opening, the working groove in the middle is connected to the working channel opening, and the oil return groove at the tail end is connected to the oil return channel opening.

3. The high-stability proportional solenoid valve according to claim 1, characterized in that: The compensation ring is a bimetallic composite structure comprising a titanium alloy substrate layer and a copper-tungsten alloy compensation layer; the copper-tungsten alloy compensation layer is brazed to the inner wall of the substrate layer; the axial height of the compensation ring is equal to the length of the magnetic sleeve.

4. The high-stability proportional solenoid valve according to claim 1, characterized in that: The magnetic sleeve is formed by coaxially welding a soft iron section and an eddy current suppression section; the eddy current suppression section is a silicon steel sheet laminate with epoxy insulating varnish between the sheets; the axial length of the laminate is equal to the width of the winding area of ​​the coil frame, and both ends are fixed to the soft iron section.

5. A high-stability proportional solenoid valve according to claim 1, characterized in that: The valve core has a three-shoulder structure with a clearance between the middle part and the valve sleeve guide hole; a pressure-stabilizing blind hole is opened at the tail of the valve core, and the bottom hole of the hole connects to the oil return channel. The displacement sensor moving iron core is press-fitted into the center hole at the front end of the valve core.

6. A high-stability proportional solenoid valve according to claim 1, characterized in that: The pressure-stabilizing piston has a 60° cone angle at the front end and a spring countersunk hole at the rear end; the pressure-stabilizing spring is a variable pitch spring, with the large pitch end connected to the adjusting screw and the small pitch end embedded in the piston countersunk hole; the cone surface of the pressure-stabilizing piston and the inner wall of the valve core blind hole form an annular damping gap.

7. A high-stability proportional solenoid valve according to claim 5, characterized in that: The displacement sensor stator coil is embedded in the inner hole of the valve sleeve and fixed by epoxy resin potting; the sensor signal line passes through the waterproof joint on the side wall of the valve sleeve; the iron core is press-fitted into the blind hole at the front end of the valve core.

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