A conical valve core for a conical electromagnetic commutating valve

Abstract

The utility model provides a kind of for the cone type electromagnetic reversing valve's cone valve core, slidingly set in valve sleeve, comprising: the core rod and piston of being integrally coaxially arranged, core rod, piston are respectively located the inflow end and outflow end of valve sleeve;Piston is provided with sealing cone platform towards the inflow end side of valve sleeve, sealing cone platform is provided with the different taper of multiple layers of each other's taper surface of link.This utility model structure is simple and reasonable, and strong integrity, the size structure of optimizing cone valve core, design multiple taper surface is advanced to the movement direction of fluid Guiding, makes jet trajectory deviate perpendicular direction, increases jet angle, changes liquid ejection direction, to reduce liquid power;While reducing liquid flow rate, increase the pressure on taper surface, reduce the pressure difference of taper surface and end surface, reduce liquid power, improve the flow range of cone type electromagnetic reversing valve, expand the application scenario of cone type electromagnetic reversing valve.

Description

Technical Field

[0001] This utility model relates to the field of testing hydraulic solenoid directional valves, and more specifically, to a conical valve core for a conical solenoid directional valve. Background Technology

[0002] Cone-type solenoid directional valves are widely used in electro-hydraulic actuators due to their compact size and low leakage. When the cone-type solenoid directional valve is in the locked position (e.g....), Figure 1 When the P port shown is closed, the cylinder locking function can be achieved. The smoothness of the opening and closing action of the cone-type solenoid directional valve directly determines the stability of the electro-hydraulic actuator.

[0003] However, the working flow of the cone-type solenoid directional valve is limited by its own structure. During operation, when the system flow exceeds the rated flow of the cone-type solenoid directional valve, the valve core is prone to jamming due to excessive hydraulic force.

[0004] like Figure 1 The diagram shows the existing structure of a cone-type solenoid directional valve. The valve core moves to the left to compress the spring, and hydraulic oil enters the valve body from port P and exits from port A. Then, the spring pushes the valve core to the right, and hydraulic oil enters the valve body from port A and exits from port T. When the flow rate through the valve core and valve sleeve exceeds the rated flow rate, a jamming fault occurs where the valve core cannot be pushed by the spring. This problem severely limits the flow range and application scenarios of the cone-type solenoid directional valve. Utility Model Content

[0005] Therefore, the purpose of this utility model is to design a conical valve core for a conical solenoid directional valve, optimize the size and structure of the conical valve core, design the conical surface to guide the fluid in advance in the direction of fluid movement, make the jet trajectory deflected to the vertical direction, increase the jet angle, change the liquid ejection direction, thereby reducing the hydraulic force, solving the problem that the spring cannot push the valve core when the flow rate through the valve core and valve sleeve is greater than the rated flow rate in the existing conical solenoid directional valve, improving the flow range of the conical solenoid directional valve, and expanding the application scenarios of the conical solenoid directional valve.

[0006] This utility model provides a conical valve core for a conical electromagnetic directional valve, which is slidably disposed in a valve sleeve. It includes a core rod and a piston that are integrally and coaxially arranged, with the core rod and piston located at the inlet end and outlet end of the valve sleeve, respectively. A sealing cone is provided on the side of the piston facing the inlet end of the valve sleeve, and the sealing cone is provided with multiple layers of interconnected conical surfaces with different tapers.

[0007] While current research has explored the relationship between valve core shape and hydraulic dynamics, it primarily focuses on spool valve structures or pressure valves, lacking a thorough analysis of the hydraulic dynamics of conical directional valves. This invention, based on the hydraulic dynamics analysis of conical directional valves, designs a novel conical valve core through theoretical calculations, CFD simulations, and experimental testing. By progressively altering the fluid direction through multi-stage conical surfaces, turbulence and pressure loss are reduced, fluid control is optimized, and the response speed and stability of the directional valve are improved. The layered conical surface design disperses the impact of high-speed fluid on the valve sleeve, reducing wear and extending the lifespan of both the valve core and valve sleeve.

[0008] The piston of the valve core has multiple layers of tapered surfaces with different tapers, which can reliably open or close for different working conditions (such as opening, transition, and full opening). Compared with arc surfaces, multiple layers of tapered surfaces with different tapers are easier to process and have a similar flow guiding effect.

[0009] The valve core design balances fluid dynamics and structural reliability through the synergistic effect of multiple conical surfaces.

[0010] Furthermore, the taper of each layer of the conical surface decreases sequentially along the axial direction of the mandrel.

[0011] The sealing cone is designed with multiple conical surfaces arranged sequentially along the jet direction, which helps the fluid transition smoothly and reduces turbulence and energy loss. As the high-pressure liquid flows through the successive conical surfaces, its kinetic energy is gradually dissipated through diffusion, deflection, and collision, reducing the impact on the valve core.

[0012] By progressively reducing the taper, fluid velocity can be gradually decreased, reducing turbulence and pressure loss. The equal height design of each conical surface ensures uniform fluid distribution, preventing localized erosion and wear. This enhances structural stability and extends valve core life.

[0013] Furthermore, a vertical plane is provided at the connection between the top of the sealing cone and the mandrel, and the vertical plane is orthogonal to the normal of the central axis of the mandrel.

[0014] The vertical plane effectively prevents high-speed fluid from directly impacting the connection, reducing stress concentration; the orthogonal design (90°) ensures smooth fluid deflection, reducing eddies and vibrations.

[0015] Furthermore, a cylindrical platform is provided at the bottom of the sealing cone, and a back cone is provided on the side of the cylindrical platform facing the outlet end of the valve sleeve, and the outer diameter of the cylindrical platform matches the outer diameter of the valve sleeve.

[0016] By matching the outer diameter of the cylindrical platform with that of the valve sleeve, the concentricity of the valve core and valve sleeve is ensured, reducing the risk of fluid leakage and simplifying manufacturing. The interior of the cylindrical platform is machined into a hollow shape to reduce component mass and improve the response speed of the solenoid valve. Pressure equalization grooves are machined on the surface of the cylindrical platform to reduce uneven radial stress. These grooves can also store impurities, preventing the valve core from jamming.

[0017] The back cone can guide the fluid to a smooth transition, reduce eddies and vibrations, and improve valve core stability.

[0018] Furthermore, the sealing cone has three conical surfaces, with the topmost conical surface connected to the mandrel and the bottommost conical surface connected to the cylindrical platform.

[0019] The top cone of the three-layer conical surface is connected to the mandrel, and the bottom cone is connected to the cylindrical platform, ensuring the concentricity of the valve core and valve sleeve, reducing the risk of fluid leakage, and reducing the difficulty of processing.

[0020] In this embodiment, three conical surfaces CD, DE, and EF are sequentially arranged along the jet direction. The conical surface CD and the central axis of the mandrel form an included angle α, where 30° < α ≤ 80°.

[0021] Preferably, α = 80°.

[0022] The conical surface CD guides the fluid's direction of motion in advance, causing the jet trajectory to deflect towards the vertical direction. This increases the jet angle, changes the direction of liquid ejection, and thus reduces hydrodynamic force.

[0023] In one embodiment of this invention, the jet angle can be changed by modifying α. α = 30° corresponds to a jet angle of 30°, and α = 80° corresponds to a jet angle of 65°. All jet angles are measured in the velocity vector diagram, and the hydrodynamic force values ​​are calculated according to formula 1-10. The relationship curve between jet angle, hydrodynamic force, and α shows that the jet angle increases with increasing α. When α is 80°, the jet angle at the outlet is the largest, and the corresponding hydrodynamic force is the smallest.

[0024] An angle β is formed between the conical surface EF and the central axis of the mandrel, where 10° ≤ β < 25°.

[0025] Preferably, β = 30°. The flow direction of the fluid is changed after passing through the electromagnetic cone valve. A vortex region appears at point F on the cone surface EF. The cone surface EF can act as a buffer, reducing the vortex region.

[0026] In the embodiments of this utility model, the angle of the conical surface EF is the optimal value obtained through simulation.

[0027] An angle γ is formed between the conical surface DE and the central axis of the mandrel, where 25°≤γ≤30°.

[0028] Preferably, γ = 25°.

[0029] Section DE is the sealing surface that mates with the valve sleeve. The angle of the conical surface DE remains unchanged, ensuring that the valve core displacement remains constant and equal to its original position. This guarantees that the new valve core displacement is within the effective stroke of the solenoid and spring, eliminating the need to replace the solenoid and spring. The conical surface DE reliably mates with the valve sleeve to achieve low leakage. The positions of points E and D are obtained in the 3D model by simulating the valve core's extreme tilt condition and contact with the valve sleeve.

[0030] Furthermore, the diameter of the mandrel is d, and the diameter at the maximum cylindrical surface of the piston is D, where 0.7D≤d≤0.5D.

[0031] In this embodiment, the new valve core diameter d = 2.82mm was calculated. The original structure has a diameter of 4mm. Therefore, the range of the new valve core diameter is 4mm > d ≥ 2.82mm. Finally, the new valve core diameter d is taken as 3mm.

[0032] Reducing the valve core diameter d directly increases the valve's oil flow capacity. Under the same flow rate, the pressure loss caused by the new valve core will be lower than the existing original structure, and the liquid flow velocity will decrease. The pressure on surface I will increase, thus reducing the pressure difference between surface I and surface II, and consequently reducing the hydraulic force. Reducing the diameter d also decreases the valve core's mass inertia, shortening the opening and closing time of the solenoid valve. To ensure the valve core can withstand bending moments, its strength was calculated and checked. Because the right end of the valve core has a guiding function, a low safety factor of 1.5 can be used.

[0033] Furthermore, the taper of the back cone is the same as the taper of the bottommost cone surface of the sealing cone, and the height of the back cone along the central axis of the mandrel is the same as that of the sealing cone.

[0034] The back cone and the sealing cone have the same taper to ensure that the fluid transitions smoothly between them, reducing turbulence and pressure loss. The back cone and the sealing cone are designed with equal height, and structural symmetry ensures uniform stress on the valve core, reducing vibration and wear caused by asymmetrical flow.

[0035] Standardizing taper and height parameters reduces machining errors, improves the fit accuracy between the valve core and valve sleeve, and simplifies machining and assembly processes.

[0036] Furthermore, a valve body is fitted on the radially outer side of the valve sleeve, and a push rod is connected to the side of the piston away from the mandrel. A push plate is provided at the end of the push rod, and the outer diameter of the push plate matches the inner diameter of the valve body.

[0037] The matched outer diameter of the push plate suppresses radial displacement of the push rod during movement, ensuring the accuracy of valve opening and closing. The push plate fits tightly against the inner wall of the valve body, increasing the concentricity of the push rod and valve sleeve, making it particularly suitable for high-pressure applications.

[0038] The pusher plate evenly distributes the axial thrust of the piston to the valve body, avoiding local stress concentration and extending the valve's lifespan.

[0039] Furthermore, a spring is provided in the radial space between the push rod and the valve body, and the central axis of the spring coincides with the central axis of the push rod.

[0040] The alignment of the spring's central axis with the push rod's central axis ensures the straightness and stability of the push rod's movement, reduces friction and wear caused by eccentricity, and extends the valve's lifespan.

[0041] Furthermore, a circumferential annular groove is provided on the outer cylindrical surface of the mandrel, and a sealing strip is embedded inside the annular groove, the sealing strip being tightly attached to the inner wall of the valve sleeve.

[0042] The line contact sealing structure between the valve core's mandrel and the valve sleeve effectively reduces the risk of leakage and improves sealing performance.

[0043] Compared with the prior art, the beneficial effects of this utility model are: The conical valve core structure provided by this utility model for a conical solenoid directional valve is simple and reasonable, with strong overall integrity. The size and structure of the conical valve core are optimized, and the conical surface is designed to guide the fluid in advance in the direction of fluid movement, making the jet trajectory deflected to the vertical direction, increasing the jet angle, changing the direction of liquid ejection, and thus reducing hydraulic force. At the same time, the liquid flow velocity is reduced, the pressure on the conical surface is increased, the pressure difference between the conical surface and the end face is reduced, and the hydraulic force is reduced. This effectively solves the problem that the spring cannot push the valve core when the flow rate through the valve core and valve sleeve is greater than the rated flow rate in existing conical solenoid directional valves, thereby improving the flow range of the conical solenoid directional valve and expanding its application scenarios. Attached Figure Description

[0044] Various other advantages and benefits will become apparent to those skilled in the art upon reading the following detailed description of preferred embodiments. The accompanying drawings are for illustrative purposes only and are not intended to limit the scope of the invention.

[0045] In the attached diagram: Figure 1 This is a diagram of the valve core structure of an existing cone-type solenoid directional valve. Figure 2 This is a structural diagram of the valve core of the cone-type electromagnetic directional valve according to an embodiment of the present utility model; Figure 3 Here is a structural diagram of the existing valve core; Figure 4 A structural diagram of the valve core optimized for an embodiment of this utility model; Figure 5 This is a vector diagram showing the velocity of the liquid outlet at α=80° in an embodiment of this utility model. Figure 6 This is a vector diagram of the velocity of the liquid outlet at α=30° in an embodiment of this utility model.

[0046] The markings in the attached figure are as follows: 1. Valve core, 2. Valve sleeve, 3. Valve body, 4. Piston, 5. Core rod, 6. Annular groove, 7. Push rod, 8. Spring, 9. Push plate. Detailed Implementation

[0047] Exemplary embodiments will now be described in detail, examples of which are illustrated in the accompanying drawings. When the following description relates to the drawings, unless otherwise indicated, the same numerals in different drawings denote the same or similar elements. The embodiments described in the following exemplary embodiments do not represent all embodiments consistent with this disclosure. Rather, they are merely examples of apparatuses and methods consistent with some aspects of this disclosure as detailed in the appended claims.

[0048] The terminology used in this disclosure is for the purpose of describing particular embodiments only and is not intended to be limiting of the disclosure. The singular forms “a,” “the,” and “the” as used in this disclosure and the appended claims are also intended to include the plural forms unless the context clearly indicates otherwise. It should also be understood that the term “and / or” as used herein refers to and includes any and all possible combinations of one or more of the associated listed items.

[0049] It should be understood that although the terms first, second, and third may be used in this disclosure to describe various information, such information should not be limited to these terms. These terms are used only to distinguish information of the same type from one another. For example, without departing from the scope of this disclosure, first information may also be referred to as second information, and similarly, second information may also be referred to as first information. Depending on the context, the word "if" as used herein may be interpreted as "when," "when," or "in response to determination."

[0050] Example This utility model embodiment provides a conical valve core for a conical solenoid directional valve, which is slidably disposed in the valve sleeve 2, such as... Figure 2The device includes a mandrel 5 and a piston 4, which are coaxially integrated and located at the inlet and outlet ends of the valve sleeve 2, respectively. A sealing cone is positioned on the piston 4 facing the inlet end of the valve sleeve 2. This sealing cone has three interconnected conical surfaces with varying tapers. The taper of each conical surface decreases sequentially along the axial direction of the mandrel. The multi-layered design of the sealing cone, with the surfaces arranged sequentially along the jet direction, facilitates a smooth fluid transition and reduces turbulence and energy loss. As the high-pressure fluid flows through the progressively smaller conical surfaces, its kinetic energy is gradually dissipated through diffusion, deflection, and collision, reducing the impact on the valve core 1. By progressively decreasing the taper, the fluid velocity is gradually reduced, minimizing turbulence and pressure loss. The equal height design of each conical surface ensures uniform fluid distribution and avoids localized erosion wear. This enhances structural stability and extends the lifespan of the valve core 1.

[0051] By gradually changing the fluid direction through multi-stage conical surfaces, turbulence and pressure loss are reduced, fluid control is optimized, and the response speed and stability of the directional valve are improved. The layered conical surface design disperses the impact of high-speed fluid on the valve sleeve 2, reducing wear and extending the life of the valve core 1 and valve sleeve 2. The multi-layered conical surfaces with different tapers on the piston 4 of the valve core 1 can reliably open or close for different operating conditions (such as opening, transition, and full opening). This design effectively reduces pressure fluctuations in the valve core 1 during its movement, improving system stability. This valve core 1 design, through the synergistic effect of multiple conical surfaces, balances fluid dynamics and structural reliability.

[0052] The sealing cone has three conical surfaces. The top conical surface is connected to the mandrel 5 at its end, and the bottom conical surface is connected to the cylindrical platform at its end.

[0053] The top cone of the three-layer conical surface is connected to the core rod 5, and the bottom cone is connected to the cylindrical platform, ensuring the concentricity of the valve core 1 and the valve sleeve 2.

[0054] In this embodiment, three layers of conical surfaces CD, DE, and EF are sequentially arranged along the jet direction (e.g., ...). Figure 4 As shown), the cone surface CD and the central axis of the mandrel 5 form an included angle α, where 30° < α ≤ 80°.

[0055] The conical surface CD guides the fluid's direction of motion in advance, causing the jet trajectory to deflect towards the vertical direction. This increases the jet angle, changes the direction of liquid ejection, and thus reduces hydrodynamic force.

[0056] Figure 5 and Figure 6The velocity vector diagrams at the outlet are shown for α=80° and α=30°, respectively. It can be seen that modifying α changes the jet angle; α=30° corresponds to a jet angle of 30°, and α=80° corresponds to a jet angle of 65°. All jet angles are measured in the velocity vector diagram, and the hydrodynamic force is calculated using formula 1-10. The relationship curves between jet angle, hydrodynamic force, and α show that the jet angle increases with increasing α. When α is 80°, the jet angle at the outlet is the largest, and the corresponding hydrodynamic force is the smallest.

[0057] An angle β is formed between the conical surface EF and the central axis of the mandrel 5, where 10° ≤ β < 25°.

[0058] When fluid passes through the electromagnetic cone valve, its flow direction is changed. A vortex region appears at point F on the cone surface EF. The cone surface EF can act as a buffer, reducing the vortex region.

[0059] In the embodiments of this utility model, the angle of the conical surface EF is the optimal value obtained through simulation.

[0060] An angle γ is formed between the conical surface DE and the central axis of the mandrel 5, where 25°≤γ≤30°.

[0061] Section DE is the sealing surface that mates with valve sleeve 2. The angle of the conical surface DE remains unchanged, ensuring that the displacement of valve core 1 remains constant. The conical surface DE can reliably mate with valve sleeve 2 to achieve low leakage. In the 3D model, the positions of points E and D are obtained by simulating the contact between valve core 1 and valve sleeve 2 under extreme tilt conditions.

[0062] The diameter of the mandrel 5 is d, and the diameter of the piston 4 at its largest cylindrical surface is D, where 0.7D≤d≤0.5D.

[0063] In this embodiment, the diameter d of the new valve core 1 is calculated to be 2.82 mm, while the diameter of the original structure is 4 mm. Therefore, the diameter range of the new valve core 1 is 4 mm > d ≥ 2.82 mm, and the final diameter d of the new valve core 1 is taken as 3 mm.

[0064] Reducing the diameter d of valve core 1 directly increases the valve's oil flow capacity. Under the same flow rate, the pressure loss caused by the new valve core 1 will be lower than that of the existing original structure (e.g., Figure 3 As shown in the figure, the liquid flow rate will decrease, the pressure on surface I will increase, the pressure difference between surface I and surface II will decrease, and the hydraulic force will decrease accordingly. In order to ensure that valve core 1 can withstand bending moment, the strength of valve core 1 was calculated and checked. Since the right end of valve core 1 has a guiding function, the safety factor can be taken as a low value of 1.5.

[0065] A vertical plane is provided at the connection between the top of the sealing cone and the core rod 5, and this vertical plane is orthogonal to the normal direction of the central axis of the core rod 5. The vertical plane effectively prevents high-speed fluid from directly impacting the connection, reducing stress concentration; the orthogonal design (90°) ensures smooth fluid diversion, reducing eddies and vibrations. A cylindrical platform is provided at the bottom of the sealing cone, and a back cone is provided on the side of the cylindrical platform facing the outlet end of the valve sleeve 2. The outer diameter of the cylindrical platform matches the outer diameter of the valve sleeve 2. Matching the outer diameter of the cylindrical platform with the valve sleeve 2 ensures the concentricity of the valve core 1 and the valve sleeve 2. The back cone guides the fluid through a smooth transition, reducing eddies and vibrations, and improving the stability of the valve core 1.

[0066] The taper of the back cone is the same as the taper of the bottommost cone of the sealing cone, and the height of the back cone along the central axis of the mandrel 5 is the same as that of the sealing cone. The use of the same taper between the back cone and the sealing cone ensures no abrupt change in fluid flow during the transition, reducing turbulence and pressure loss. The equal height design of the back cone and the sealing cone ensures uniform force distribution on the valve core 1 through structural symmetry, reducing vibration and wear caused by asymmetrical flow. Unified taper and height parameters reduce machining errors, improve the fitting accuracy between the valve core 1 and the valve sleeve 2, and simplify machining and assembly processes.

[0067] A valve body 3 is fitted radially outward from the valve sleeve 2. A push rod 7 is connected to the side of the piston 4 away from the mandrel 5. A push plate 9 is provided at the end of the push rod 7, and the outer diameter of the push plate 9 matches the inner diameter of the valve body 3. The matching outer diameter of the push plate 9 can suppress the radial displacement of the push rod 7 during movement, ensuring the accuracy of valve opening and closing. The push plate 9 fits tightly with the inner wall of the valve body 3, increasing the concentricity of the push rod 7 and the valve sleeve 2, which is especially suitable for high-pressure scenarios. The push plate 9 evenly distributes the axial thrust of the piston 4 to the valve body 3, avoiding local stress concentration and extending valve life.

[0068] A circumferential annular groove 6 is provided on the outer cylindrical surface of the mandrel 5, and a sealing strip is embedded inside the annular groove 6, which is tightly attached to the inner wall of the valve sleeve 2. The line contact sealing structure between the mandrel 5 of the valve core 1 and the valve sleeve 2 can effectively reduce the risk of leakage and improve the sealing performance.

[0069] A spring 8 is installed in the radial space between the push rod 7 and the valve body 3, with the central axis of the spring 8 coinciding with the central axis of the push rod 7. This coincidence ensures the straightness and stability of the push rod 7 during movement, reduces friction and wear caused by eccentricity, and extends the valve's lifespan.

[0070] The conical valve core provided in this embodiment for a conical solenoid directional valve optimizes the size and structure of the conical valve core. The conical surface is designed to guide the fluid in advance in the direction of fluid movement, causing the jet trajectory to deflect towards the vertical direction, increasing the jet angle, changing the direction of liquid ejection, and thus reducing hydraulic force. At the same time, it reduces the liquid flow velocity, increases the pressure on the conical surface, reduces the pressure difference between the conical surface and the end face, and reduces hydraulic force. This effectively solves the problem in existing conical solenoid directional valves where the spring cannot push the valve core when the flow rate through the valve core and valve sleeve is greater than the rated flow rate, thus improving the flow range of the conical solenoid directional valve.

[0071] The technical solution of this utility model has been described above with reference to the preferred embodiments shown in the accompanying drawings. However, it will be readily understood by those skilled in the art that the protection scope of this utility model is obviously not limited to these specific embodiments. Without departing from the principle of this utility model, those skilled in the art can make equivalent changes or substitutions to the relevant technical features, and the technical solutions after these changes or substitutions will all fall within the protection scope of this utility model.

[0072] The above description is merely a preferred embodiment of this utility model and is not intended to limit the scope of this utility model. Various modifications and variations can be made to this utility model by those skilled in the art. Any modifications, substitutions, or improvements made within the spirit and principles of this utility model should be included within the protection scope of this utility model.

Claims

1. A conical valve core for a conical solenoid directional valve, characterized in that, The valve sleeve is slidably disposed therein, comprising: a core rod and a piston that are integrally and coaxially arranged, wherein the core rod and the piston are respectively located at the inlet end and the outlet end of the valve sleeve; a sealing cone is provided on the side of the piston facing the inlet end of the valve sleeve, and the sealing cone is provided with multiple layers of interconnected conical surfaces with different tapers; The taper of each layer of the conical surface decreases sequentially along the axial direction of the mandrel.

2. The conical valve core for a conical solenoid directional valve according to claim 1, characterized in that, A vertical plane is provided at the connection between the top of the sealing cone and the mandrel, and the vertical plane is orthogonal to the normal of the central axis of the mandrel.

3. The conical valve core for a conical solenoid directional valve according to claim 1, characterized in that, The bottom of the sealing cone is provided with a cylindrical platform, and the cylindrical platform is provided with a back cone on the side facing the outlet end of the valve sleeve. The outer diameter of the cylindrical platform matches the outer diameter of the valve sleeve.

4. The conical valve core for a conical solenoid directional valve according to claim 3, characterized in that, The sealing cone has three conical surfaces. The topmost conical surface is connected to the mandrel, and the bottommost conical surface is connected to the cylindrical platform.

5. The conical valve core for a conical solenoid directional valve according to claim 3, characterized in that, The taper of the back cone is the same as the taper of the bottommost cone surface of the sealing cone, and the height of the back cone along the central axis of the mandrel is the same as that of the sealing cone.

6. The conical valve core for a conical solenoid directional valve according to claim 1, characterized in that, A valve body is fitted on the radially outer side of the valve sleeve. A push rod is connected to the side of the piston away from the mandrel. A push plate is provided at the end of the push rod. The outer diameter of the push plate matches the inner diameter of the valve body.

7. The conical valve core for a conical solenoid directional valve according to claim 6, characterized in that, A spring is provided in the radial space between the push rod and the valve body, and the central axis of the spring coincides with the central axis of the push rod.

8. The conical valve core for a conical solenoid directional valve according to claim 1, characterized in that, A circumferential annular groove is provided on the outer cylindrical surface of the mandrel, and a sealing strip is embedded inside the annular groove, the sealing strip being tightly attached to the inner wall of the valve sleeve.

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