A hydraulic valve

Abstract

The utility model discloses a hydraulic valve, the utility model discloses a hydraulic valve including valve body, along the axial direction of valve body, and valve body is provided with the valve body cavity and valve body hole that communicate with each other, is provided with static armature and valve core in the valve body cavity, and static armature is provided with static armature cavity, and reset spring in the compressed state is provided with in static armature cavity, and reset spring is in abutment with valve core, and valve core is used for plugging or opening valve body hole, the outer peripheral surface of valve body is still provided with the electromagnetic coil of setting, still be provided with valve body liquid inlet hole on valve body, and valve body liquid inlet hole communicates with valve body cavity, and the valve core liquid inlet hole that is provided with is on valve core, and valve core still is provided with valve core cavity, and valve core liquid inlet hole communicates with valve core cavity, and there is clearance between valve body and valve core, and valve body liquid inlet hole, clearance, valve core liquid inlet hole, valve core cavity and static armature cavity communicate. The utility model discloses a hydraulic valve good sealing, effectively guarantee the reliability of hydraulic valve when working.

Description

Technical Field

[0001] This utility model belongs to the field of hydraulic valve technology, and specifically relates to a hydraulic valve. Background Technology

[0002] In modern industrial production, hydraulic systems, as a highly efficient means of power transmission and control, are widely used in numerous fields. Normally closed hydraulic valves, as key components of hydraulic systems, remain closed when not in operation to prevent fluid leakage and ensure the safe and stable operation of the system. They play a decisive role in controlling the system's flow, pressure, and direction. As manufacturing moves towards intelligent and high-precision manufacturing, the shortcomings of traditional hydraulic valves in terms of control accuracy, response speed, and stability are becoming increasingly apparent.

[0003] Normally closed digital hydraulic valves, due to their ability to automatically close when not in operation, preventing fluid leakage and ensuring system safety, are widely used in many industrial scenarios with stringent safety requirements, such as hydraulic braking systems in aerospace, electro-hydraulic control systems in new energy vehicles, and hydraulic suspension systems in agricultural machinery. However, existing normally closed hydraulic valves generally suffer from the following problems that urgently need to be addressed:

[0004] 1. Uneven force on the valve core

[0005] Traditional structural design causes the valve core to bear a large hydraulic imbalance force during operation. This not only increases the resistance of the valve core movement, resulting in slow response, but also aggravates the wear between the valve core and the valve body, significantly shortening the service life of the hydraulic valve.

[0006] 2. Poor sealing performance

[0007] Most normally closed hydraulic valves use planar seals or conventional conical seals. When faced with high temperature (>80℃), high pressure (>15MPa), and high frequency (hundreds or even thousands of actions per second), they are prone to leakage due to slight deformation and wear of the sealing surface. After long-term operation, the leakage of such sealing structures can reach 0.5mL / min, which seriously affects the working efficiency and stability of the system.

[0008] 3. Response lag

[0009] With the increasing level of industrial automation, the demand for precise control of hydraulic valve flow and pressure is growing. However, due to the limitations of its structure and control method, traditional normally closed hydraulic valves are difficult to achieve precise regulation of flow and pressure, with control accuracy typically reaching around ±5%, which is insufficient for applications requiring extremely high control precision.

[0010] In conclusion, developing a normally closed digital hydraulic valve with force balance, high sealing performance, and high-precision digital control has become a key issue that urgently needs to be addressed in the field of hydraulic control technology. Summary of the Invention

[0011] The technical problem to be solved by this utility model is to provide a hydraulic valve with good sealing performance, which effectively ensures the reliability of the hydraulic valve during operation.

[0012] To solve the above-mentioned technical problems, the present invention adopts the following technical solution:

[0013] A hydraulic valve includes a valve body. Along the axial direction of the valve body, the valve body has a communicating valve body cavity and a valve body hole. A stationary armature and a valve core are disposed within the valve body cavity. The stationary armature has a stationary armature cavity, and a compressed return spring is disposed within the stationary armature cavity. The return spring abuts against the valve core, and the valve core is used to block or open the valve body hole. An electromagnetic coil is also sleeved on the outer circumferential surface of the valve body. The valve body also has a valve body inlet hole communicating with the valve body cavity. The valve core has a valve core inlet hole and a valve core cavity. The valve core inlet hole communicates with the valve core cavity. A gap exists between the valve body and the valve core. The valve body inlet hole, the gap, the valve core inlet hole, the valve core cavity, and the stationary armature cavity are interconnected.

[0014] Furthermore, the valve core includes a sealing portion, and the sealing surface of the sealing portion is a conical surface.

[0015] Furthermore, the conical surface is a 90° conical surface.

[0016] Furthermore, the outer circumferential surface of the valve core is provided with an annular groove, which is connected to the gap.

[0017] Furthermore, the hydraulic valve also includes a nut located at one end of the stationary armature, and the nut is threadedly connected to the valve body.

[0018] Furthermore, a sealing ring A is provided on the outer peripheral surface of the valve body, and a support ring A is provided on one side of the sealing ring A.

[0019] Furthermore, a sealing ring B is provided on the outer peripheral surface of the valve body, and a support ring B is provided on one side of the sealing ring B.

[0020] Furthermore, a sealing ring C is provided on the outer peripheral surface of the stationary armature.

[0021] Furthermore, the valve body is also provided with a pressure relief chamber, which is located on both sides of the valve body hole, and the pressure relief chamber is connected to the valve body hole.

[0022] Furthermore, the outer surface of the valve body is also provided with a connector.

[0023] The beneficial effects of this utility model after adopting the above technology are:

[0024] The hydraulic valve of this invention includes a valve body. Along the axial direction of the valve body, a valve body cavity and a valve body hole are connected. A stationary armature and a valve core are disposed within the valve body cavity. The stationary armature has a stationary armature cavity, within which a compressed return spring is disposed. The return spring abuts against the valve core, which is used to block or open the valve body hole. An electromagnetic coil is also sleeved on the outer circumferential surface of the valve body. The valve body also has a valve body inlet hole, which communicates with the valve body cavity. The valve core has a valve core inlet hole and a valve core cavity, which communicates with the valve core cavity. A gap exists between the valve body and the valve core. The valve body inlet hole, the gap, the valve core inlet hole, the valve core cavity, and the stationary armature cavity are interconnected. The hydraulic valve of this invention has good sealing performance, effectively ensuring the reliability of the hydraulic valve during operation. Attached Figure Description

[0025] Figure 1 This is a schematic diagram of the hydraulic valve (open state) of this utility model;

[0026] Figure 2 This is a schematic diagram of the hydraulic valve (closed state) of this utility model;

[0027] Figure 3 yes Figure 1 Enlarged structural diagram of the middle valve body;

[0028] Figure 4 yes Figure 1 An enlarged structural schematic diagram of the central valve core;

[0029] In the diagram, the direction of the arrows represents the flow direction of the hydraulic oil;

[0030] In the diagram: 1. Connector; 2. Valve body; 21. Valve body cavity; 22. Valve body hole; 23. Valve body inlet hole; 24. Pressure relief chamber; 3. Valve core; 31. Sealing surface; 32. Valve core cavity; 33. Valve core inlet hole; 34. Groove; 4. Nut; 5. Stationary armature; 6. Return spring; 7. Adjusting shim; 8. Electromagnetic coil; 9. Support ring A; 10. Sealing ring A; 11. Sealing ring B; 12. Support ring B; 13. Sealing ring C; 14. Valve sleeve. Detailed Implementation

[0031] The technical solution of this utility model will be described in detail below with reference to the accompanying drawings and specific embodiments to further understand the purpose, solution and effect of this utility model, but it is not intended to limit the scope of protection of the appended claims of this utility model.

[0032] Combination Figure 1 , Figure 2 , Figure 3 as well as Figure 4 As shown, a hydraulic valve includes a valve body 2. Along the axial direction of the valve body 2, the valve body 2 is provided with a valve body cavity 21 and a valve body hole 22 that are connected. A stationary armature 5 and a valve core 3 are disposed within the valve body cavity 21. The stationary armature 5 has a stationary armature cavity, within which a compressed return spring 6 is disposed. The return spring 6 abuts against the valve core 3, which is used to block or open the valve body hole 22. An electromagnetic coil 8 is also sleeved on the outer circumferential surface of the valve body 2. The valve body 2 is also provided with a valve body inlet hole 23, which communicates with the valve body cavity 21. The valve core 3 is provided with a valve core inlet hole 33, and the valve core 3 is also provided with a valve core cavity 32, which communicates with the valve core cavity 32. A gap exists between the valve body 2 and the valve core 3, and the valve body inlet hole 23, the gap, the valve core inlet hole 33, the valve core cavity 32, and the stationary armature cavity are connected.

[0033] Preferably, the valve core 3 includes a sealing part, and the sealing surface 31 of the sealing part is a conical surface.

[0034] More preferably, the conical surface is a 90° conical surface, which reduces the risk of leakage and achieves near-zero leakage under high-pressure conditions. This effectively avoids energy loss, environmental pollution, and system failure caused by leakage in the hydraulic system, significantly improving the operational stability and reliability of the hydraulic system. Compared with traditional flat seals, the conical surface seal has a 3-fold longer sealing life and a 25% lower processing cost.

[0035] Preferably, the outer circumferential surface of the valve core 3 is provided with an annular groove 34, which is connected to the gap. Impurities in the hydraulic oil are deposited in the groove 34, improving the filtration efficiency of solid particles (≥5μm) in the hydraulic oil to 95%, which helps protect the valve body 2 from damage.

[0036] Preferably, the hydraulic valve further includes a nut 4 located at one end of the stationary armature 5, and the nut 4 is threadedly connected to the valve body 2.

[0037] Preferably, a sealing ring A10 is also provided on the outer peripheral surface of the valve body 2, and a support ring A9 is provided on one side of the sealing ring A10.

[0038] More preferably, a sealing ring B11 is also provided on the outer peripheral surface of the valve body 2, and a support ring B12 is also provided on one side of the sealing ring B11.

[0039] The use of support rings A9 and B12 effectively protects sealing rings A10 and B11, preventing them from being scratched and ensuring their integrity. It also distributes the radial pressure on sealing rings A10 and B11, preventing excessive compression and deformation, maintaining their elasticity, and ensuring stable long-term sealing performance. Furthermore, it isolates sealing rings A10 and B11, preventing particulate impurities from entering the gap between them and the sealing surface, reducing wear, and extending their replacement cycle.

[0040] Preferably, a sealing ring C13 is provided on the outer peripheral surface of the stationary armature 5.

[0041] Preferably, the valve body 2 is further provided with a pressure relief chamber 24, which is located on both sides of the valve body hole 22, and the pressure relief chamber 24 is connected to the valve body hole 22.

[0042] Preferably, the outer surface of the valve body 2 is also provided with a connector 1.

[0043] Preferably, an adjusting shim 7 is provided between the stationary armature 5 and the valve body 2.

[0044] Preferably, a valve sleeve 14 is also provided on the outer peripheral surface of the valve body 2, and the valve sleeve 14 is preferably an integral structure with the valve body 2.

[0045] Preferably, the valve core 3 is a valve core 3 with high magnetic permeability, and the material of the valve core 3 is DT4E electrical pure iron with magnetic permeability μ≥8000H / m.

[0046] The electromagnetic coil 8 is a high-performance enameled wire electromagnetic coil 8. The temperature resistance rating of the electromagnetic coil 8 is F, which can withstand a high temperature of 155℃.

[0047] The reset spring 6 is made of 50CrVA spring steel with a spring stiffness of 10-15N / mm, ensuring that the valve core 3 can quickly and reliably return to the closed position when the power is off. The valve core 3 blocks the valve body hole 22, and the closing response time is less than 15ms, which can realize precise control of the movement of the valve core 3.

[0048] The thickness of the adjusting shim 7 is adjusted to meet the requirements for regulating the flow and pressure of the hydraulic valve under different working conditions.

[0049] When the hydraulic valve of this invention is in operation, high-pressure hydraulic fluid enters the valve body through multiple circumferentially distributed valve body inlet holes 23. Part of the fluid flows through the gap between the valve core 3 and the valve body 2 to the valve body hole 22, and then into the pressure relief chamber 24. The other part enters the valve core cavity 32 through the multiple circumferentially distributed valve core inlet holes 33 of the valve core 3, and then continues into the stationary armature cavity, thus balancing the pressure at both ends of the valve core 3. Theoretical calculations and actual tests show that the hydraulic imbalance force on the valve core 3 can be reduced by more than 95%, effectively reducing the movement resistance of the valve core 3 and significantly improving the response speed and control accuracy of the hydraulic valve.

[0050] The opening and closing response time of the hydraulic valve of this invention is less than 20ms. Compared with the traditional normally closed hydraulic valve, the response time is shortened by more than 60%, which can quickly and accurately respond to the control signals of the hydraulic system and greatly improve the dynamic performance of the hydraulic system.

[0051] The sealing surface 31 of the valve core 3 is made of a 90° hard alloy conical surface (hardness HRC60±2), and a precise fit with the valve body 2 is achieved through laser cladding. The leakage of sealing rings A10 and B11 under 18MPa high pressure is controlled at 0.8mL / h. Sealing ring C13 ensures a tight fit between the stationary armature 5 and the valve body 2, preventing pressure leakage.

[0052] The hydraulic valve of this invention has an ultra-long service life of 20 million cycles, which greatly reduces equipment maintenance costs and downtime, and improves production efficiency.

[0053] The hydraulic valve of this invention can adapt to working environments of -30℃ to 45℃ and oil temperatures of 60℃ to 100℃, and can be adapted to hydraulic oil media with different viscosity ranges (10-400cSt). It is suitable for various complex and harsh industrial application environments and has broad application prospects and market competitiveness.

[0054] In the initial state or under power failure, the spring force of the return spring 6 pushes the valve core 3 tightly to the closed position, and the valve core 3 blocks the valve body hole 22. At this time, the sealing surface 31 of the valve core 3 is in close contact with the valve body 2, forming a reliable seal, blocking the flow of hydraulic oil, ensuring the safety of the hydraulic system, and effectively preventing pressure loss and fluid leakage.

[0055] When the digital control module receives an external activation signal, it immediately outputs a precisely controlled current to the electromagnetic coil 8, generating a strong electromagnetic attraction. Under the action of the electromagnetic attraction, the spring force of the return spring 6 is overcome, causing the valve core 3 to move. The sealing surface 31 disengages from the valve body hole 22. During the movement of the valve core 3, the high-pressure hydraulic oil entering through the valve body inlet hole 23 quickly enters the valve body 2 and enters the stationary armature cavity through the valve core inlet hole 33 and the valve core cavity 32, so that the valve core 3 always maintains a force balance and the movement resistance is minimal.

[0056] The opening degree of the valve core 3 can be adjusted by controlling the thickness of the shim 7. When the hydraulic valve is in operation, the strong electromagnetic force drives the valve core 3 to move. The distance the valve core 3 moves (hydraulic oil flow area) can be changed by adjusting the thickness of the shim 7, thereby achieving precise flow control of the hydraulic valve. At the same time, the pressure sensor monitors the pressure data at the inlet and outlet of the hydraulic valve in real time. The digital control module automatically adjusts the energizing parameters of the solenoid coil 8 according to the feedback signal to achieve precise pressure control.

[0057] When the external control signal cuts off the current to the solenoid coil 8, the electromagnetic attraction disappears. The return spring 6 quickly pushes the valve core 3 back to the closed position, and the sealing surface 31 of the valve core 3 seals the valve body hole 22, achieving rapid and reliable closure. The closing time of the hydraulic valve is less than 15ms.

[0058] The technical features with serial numbers mentioned in this manual (such as support ring A, sealing ring A, sealing ring B, support ring B, sealing ring C, etc.) are only for distinguishing each technical feature and do not represent the positional relationship, installation sequence, or working sequence of the technical features.

[0059] In the description of this specification, it should be understood that the orientation or positional relationship described by terms such as "outer peripheral surface" is based on the orientation or positional relationship shown in the accompanying drawings, and is only for the convenience of describing this utility model and simplifying the description, and is not intended to indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation, and therefore should not be construed as a limitation of this utility model.

[0060] This utility model is not limited to the above embodiments. All improvements made based on the concept, principle, structure and method of this utility model are within the protection scope of this utility model.

Claims

1. A hydraulic valve, characterized in that, The valve body includes a valve body with a communicating valve body cavity and a valve body hole along its axial direction. A stationary armature and a valve core are disposed within the valve body cavity. The stationary armature has a stationary armature cavity, and a compressed return spring is disposed within the stationary armature cavity. The return spring abuts against the valve core, and the valve core is used to block or open the valve body hole. An electromagnetic coil is also sleeved on the outer circumferential surface of the valve body. The valve body also has a valve body inlet hole communicating with the valve body cavity. The valve core has a valve core inlet hole and a valve core cavity, with the valve core inlet hole communicating with the valve core cavity. A gap exists between the valve body and the valve core, and the valve body inlet hole, the gap, the valve core inlet hole, the valve core cavity, and the stationary armature cavity are interconnected.

2. The hydraulic valve as described in claim 1, characterized in that, The valve core includes a sealing part, and the sealing surface of the sealing part is a conical surface.

3. The hydraulic valve as described in claim 2, characterized in that, The conical surface is a 90° conical surface.

4. The hydraulic valve as described in claim 1, characterized in that, The outer circumferential surface of the valve core is provided with an annular groove, which is connected to the gap.

5. The hydraulic valve as described in claim 1, characterized in that, The hydraulic valve also includes a nut located at one end of the stationary armature, and the nut is threadedly connected to the valve body.

6. The hydraulic valve as described in claim 1, characterized in that, A sealing ring A is also provided on the outer peripheral surface of the valve body, and a support ring A is provided on one side of the sealing ring A.

7. The hydraulic valve as described in claim 1, characterized in that, A sealing ring B is also provided on the outer circumferential surface of the valve body, and a support ring B is also provided on one side of the sealing ring B.

8. The hydraulic valve as described in claim 1, characterized in that, A sealing ring C is provided on the outer circumferential surface of the stationary armature.

9. The hydraulic valve as described in claim 1, characterized in that, The valve body is also provided with a pressure relief chamber, which is located on both sides of the valve body hole and is connected to the valve body hole.

10. The hydraulic valve as claimed in claim 1, characterized in that, The outer surface of the valve body is also provided with a connector.

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