Improved hydraulic valve

Abstract

The utility model relates to the technical field of hydraulic valves, and discloses an improved hydraulic valve, which comprises a hydraulic valve main body, the hydraulic valve main body comprises a valve body, an oil inlet, an oil outlet and an oil outlet, the interior of the valve element can move in the valve body in a reciprocating mode so as to control the communication state of all the oil ports; the sealing assembly is composed of a multi-layer sealing structure arranged between the valve element and the inner wall of the valve body, the multi-layer sealing structure sequentially comprises a graphite sealing ring, a rubber annular ring and a metal sealing gasket from inside to outside, the graphite sealing ring is tightly attached to the valve element, and the rubber annular ring is located on the outer side of the graphite sealing ring. Through the arrangement of the sealing assembly, the multi-layer structure of graphite, rubber and a metal sealing gasket, tight attachment is achieved, contact pressure is reasonable, hydraulic oil leakage is effectively prevented, system pressure loss is reduced, working efficiency is improved, and meanwhile environmental pollution and economic burden caused by leakage are avoided.

Description

TECHNICAL FIELD

[0001] The utility model relates to hydraulic valve technical field more particularly to improved hydraulic valve. BACKGROUND

[0002] In various hydraulic systems of modern industry, hydraulic valve undoubtedly occupies the key position, and its core role is to accurately control the flow direction, pressure and flow of hydraulic oil, and then to achieve accurate control of the execution element, to provide solid guarantee for the stable operation of the whole system. However, by examining the performance of the traditional hydraulic valve in the long-term operation process, it is not difficult to find that it has obvious defects. Especially in the sealing performance, the traditional hydraulic valve is difficult to meet the actual demand, and there is a problem of sealing, which makes the hydraulic oil leakage phenomenon occur. The leakage of hydraulic oil not only leads to the loss of internal pressure of the system, thereby reducing the working efficiency and affecting the normal operation of the equipment, but also the leaked hydraulic oil, if not properly treated, directly enters the environment, which may pollute the soil, water and other environment, cause a series of environmental problems, and bring additional environmental pressure and economic burden to the enterprise. Therefore, in view of this, the existing structure and defects are improved, and the improved hydraulic valve is provided, so as to achieve the purpose of more practical value. SUMMARY

[0003] In order to overcome the above-mentioned defects of the prior art, the utility model provides an improved hydraulic valve to solve the problems in the background art.

[0004] The utility model provides the following technical scheme: improved hydraulic valve, including hydraulic valve main part, the hydraulic valve main part includes:

[0005] Valve body, the valve body is provided with oil inlet and oil outlet;

[0006] Valve core, in the valve core, reciprocating movement can be carried out in the valve body, so as to control the communication state of each oil port;

[0007] Sealing assembly, which is composed of multiple layers of sealing structure arranged between the valve core and the inner wall of the valve body, the multiple layers of sealing structure are graphite sealing ring, rubber annular ring and metal sealing gasket from inside to outside, the graphite sealing ring is closely combined with the valve core, the rubber annular ring is located on the outside of the graphite sealing ring, and the metal sealing gasket is located on the outside of the rubber annular ring and closely contacts with the inner wall of the valve body, so as to ensure good sealing effect;

[0008] Driving mechanism, including electromagnet and reset spring, the electromagnet is arranged at one end of the valve body, the reset spring is connected between the valve core and the end of the valve body, which is used for accurately resetting the valve core when the electromagnet is powered off, to ensure the reliable work of the hydraulic valve.

[0009] Further, the outer surface of the metal sealing gasket is provided with an external wear-resistant coating made of titanium nitride material.

[0010] Further, the oil inlet and the oil outlet are detachably provided with filters for filtering impurities in the hydraulic oil.

[0011] Further, the thickness of the external wear-resistant coating is 6 microns, and the value range of 6 microns is 3 microns to 8 microns, so as to ensure the wear resistance and service life of the valve core without affecting the normal working performance of the valve core.

[0012] Further, the filter is internally provided with multiple layers of filter screens with different precision, including coarse filter screens, fine filter screens and precision filter screens, so as to effectively filter out impurity particles in the hydraulic oil.

[0013] Further, the filter and the oil inlet and the oil outlet are connected in a threaded connection mode, so as to facilitate quick disassembly, cleaning and replacement.

[0014] Further, the shell of the filter is made of stainless steel, and has good corrosion resistance and pressure resistance, so as to adapt to the working environment of the hydraulic system.

[0015] The technical effects and advantages of the utility model are as follows:

[0016] 1. The utility model discloses a sealing assembly, graphite, rubber and the multilayer structure of metal sealing gasket, and the close adhesion and contact pressure are reasonable, effectively prevent the hydraulic oil leakage, reduce the system pressure loss, improve the working efficiency, and the environmental pollution and economic burden caused by leakage are avoided simultaneously.

[0017] 2. The utility model discloses a metal sealing gasket, and the external wear-resistant coating of titanium nitride on the outer surface is prepared through an advanced physical vapor deposition process, and has high bonding strength and large hardness. The thickness is in the optimization range of 3-8 microns, can make the valve core wear rate reduce about 50%-60% compared with the uncoated valve core, ensures that the valve core movement response time delay is not more than 5 milliseconds, greatly enhances the wear resistance and service life of the sealing gasket, effectively resists the friction and hydraulic oil scouring in long-term work, stabilizes the sealing effect, reduces the maintenance frequency and cost, improves the reliability and stability of the hydraulic valve as a whole, and guarantees the long-term stable operation of the hydraulic system. DRAWINGS

[0018] Figure 1 It is the first structure of the utility model three-dimensional section schematic diagram.

[0019] Figure 2 It is the second structure of the utility model three-dimensional section schematic diagram.

[0020] Figure 3 It is a structure perspective view of the utility model.

[0021] Figure 4 It is a structure perspective view of the utility model. Figure 1 It is a structure perspective view of the utility model.

[0022] In the figure: 100, hydraulic valve main body;110, valve body;111, oil inlet;112, oil outlet;113, valve core;114, electromagnet;115, reset spring;116, graphite sealing ring;117, rubber annular ring;118, metal sealing pad;119, external wear-resistant coating;120, filter. Specific implementation

[0023] The technical scheme in the utility model will be described clearly and completely below in combination with the drawings in the utility model.

[0024] Embodiment one: the improved hydraulic valve provided by the utility model, the core component is hydraulic valve main body 100, the hydraulic valve main body 100 is mainly composed of the following key parts:

[0025] Valve body 110: valve body 110 is the basic structural component of the whole hydraulic valve, the material thereof selects high-strength alloy material with good corrosion resistance, is formed by precision casting process, to ensure the size precision and surface quality of its internal passage. Oil inlet 111 and oil outlet 112 are accurately machined on valve body 110, the hole diameter of oil inlet 111 and oil outlet 112 is optimized and designed according to the flow demand and pressure requirement of the hydraulic system, the inner wall is finely ground and polished, and the surface roughness reaches Ra0.8-Ra1.6 microns, effectively reduces the flow resistance of hydraulic oil when entering and exiting the valve, and reduces the possibility of impurities adhering and accumulating on the wall, so as to ensure the smooth transmission of hydraulic oil and the long-term stable operation of the valve.

[0026] Valve core 113: valve core 113 is arranged in the precision fit hole inside valve body 110, and the fitting precision between valve core 113 and the inner wall of valve body 110 is controlled within a small tolerance range, to ensure that the valve core can smoothly and accurately reciprocate in valve body 110, so as to accurately control the communication state of each oil port and realize accurate control of the hydraulic system. High-quality alloy steel material is used for the manufacture of valve core 113, and heat treatment processes such as quenching and tempering are carried out, to improve the overall hardness and wear resistance of valve core 113, ensure that the shape and size precision of valve core can be maintained in a stable state during long-term frequent operation, and further ensure the reliable performance of the hydraulic valve.

[0027] Sealing assembly: The sealing assembly plays a crucial role in the performance of the hydraulic valve, which is composed of multiple layers of sealing structures arranged between the valve core 113 and the inner wall of the valve body 110. The innermost graphite sealing ring 116 is made of high-purity graphite material, which has good self-lubricating properties and high-temperature resistance. It tightly fits with the valve core 113, with a deviation of no more than ±0.05 millimeters, ensuring that during the reciprocating motion of the valve core, it can effectively prevent hydraulic oil from leaking from the tiny gap between the valve core and the valve body, while reducing the frictional resistance during the movement of the valve core. The rubber ring 117 outside the graphite sealing ring 116 is made of oil-resistant and high-pressure-resistant rubber material, which has good elasticity and sealing performance, and can further enhance the sealing effect and compensate for possible minor sealing defects of the graphite sealing ring. The outermost metal sealing gasket 118 is made of high-strength stainless steel material, which tightly contacts with the inner wall of the valve body 110. Through precise processing technology, it ensures that the contact pressure between the metal sealing gasket and the inner wall of the valve body is uniform and maintained between 0.5-1.0 MPa, thereby providing reliable support and sealing protection for the entire sealing assembly, effectively preventing hydraulic oil leakage and improving the working efficiency and stability of the hydraulic system.

[0028] Drive mechanism: The drive mechanism mainly includes an electromagnet 114 and a return spring 115. The electromagnet 114 is made of high magnetic permeability core material and adopts an optimized coil winding process to ensure that it can generate a strong and stable electromagnetic force when energized. The electromagnet 114 is precisely installed at one end of the valve body 110, and the connection part between the electromagnet 114 and the valve core 113 is finely processed and adjusted to ensure the firmness and coaxiality of the connection, so as to ensure that the electromagnetic force can be accurately transmitted to the valve core to drive the valve core to move quickly and smoothly. The return spring 115 is connected between the valve core 113 and the end of the valve body 110. The return spring 115 is made of spring steel material with good elastic fatigue life, and its elastic coefficient is accurately calculated and experimentally verified to be 5-10 N / mm, which can quickly and accurately reset the valve core 113 to the initial position when the electromagnet 114 is de-energized, ensuring that the hydraulic valve can return to a stable initial state after each working cycle, thereby ensuring the reliable working performance and service life of the entire hydraulic valve. Example two

[0029] Example two is a further optimization and improvement based on example one, and the main differences between example two and example one are as follows:

[0030] The outer surface of the metal gasket 118 is coated with an outer wear-resistant coating 119 made of titanium nitride (TiN) material through an advanced physical vapor deposition (PVD) process. During the coating preparation process, process parameters such as deposition temperature, gas flow, deposition time, etc. are strictly controlled to ensure the quality and performance of the coating are stable and reliable. Through precise detection means, the bonding strength of the coating to the metal gasket 118 base is ensured to be no less than 800 MPa, and the hardness of the coating reaches 2000-2500 HV, so that the metal gasket has excellent wear resistance and corrosion resistance under the harsh working conditions of long-term friction with the inner wall of the valve body and hydraulic oil erosion, thereby significantly prolonging the service life of the metal gasket and further improving the overall reliability and stability of the hydraulic valve. After a large number of experimental tests and actual working condition simulations, it is determined that the optimal thickness of the outer wear-resistant coating 119 is 6 microns, with a value range of 3 microns to 8 microns. Within this thickness range, both the wear resistance and service life of the valve core can be significantly improved, and at the same time, the normal working performance of the valve core, such as the movement response speed and sealing performance of the valve core, will not be affected due to the over-thickness of the coating. According to actual tests, when the coating thickness is within this optimized range, the wear rate of the valve core is reduced by about 50%-60% compared to the valve core without coating, and the movement response time delay of the valve core does not exceed 5 milliseconds, fully meeting the efficient and stable operation requirements of the hydraulic valve under various complex working conditions.

[0031] The filter 120 is provided with a plurality of layers of filter screens with different precision, including a coarse filter screen, a fine filter screen and a precision filter screen. The three layers of filter screens are arranged in the order of coarse filter screen, fine filter screen and precision filter screen from the oil inlet direction to the oil outlet direction, and the spacing between the filter screens is kept between 5-10 mm to ensure efficient interception and filtration of impurities with different particle sizes and smooth passage of hydraulic oil and reduce pressure loss. The mesh size of the coarse filter screen is 100-150 microns, mainly used for intercepting larger particles such as metal debris and sand; the mesh size of the fine filter screen is 20-50 microns, which can further filter smaller impurity particles; and the mesh size of the precision filter screen is 5-10 microns, which can effectively capture tiny impurities to ensure that the hydraulic oil entering the hydraulic valve meets the extremely high cleanliness standard. The connection between the filter 120 and the oil inlet port 111 and the oil outlet port 112 is screw connection, which is simple and reliable, and convenient for operators to quickly and conveniently disassemble, clean and replace the filter when needed, to ensure that the filter always maintains good filtering performance. The shell of the filter 120 is made of high-quality stainless steel, which has good corrosion resistance and pressure resistance and can withstand high-pressure impact in the hydraulic system and erosion of various chemical media, thereby adapting to the complex and variable working environment of the hydraulic system, providing reliable protection for the filter screens inside the filter, ensuring long-term stable operation of the entire filter, and thereby providing strong protection for the normal operation of the hydraulic valve.

[0032] In summary, through the detailed structure and design of Example 1 and Example 2, the improved hydraulic valve of the present application has made significant progress and improvement in sealing performance, wear resistance, filtration performance and overall reliability, etc., and can effectively solve many problems existing in traditional hydraulic valves, meet the urgent needs of modern hydraulic systems for high-performance hydraulic valves, and has broad market application prospects and practical value.

[0033] Please note that the parameter values in the above specific embodiments (such as surface roughness range, fit deviation, contact pressure, elastic coefficient, coating bond strength, hardness, coating thickness, filter mesh size, filter spacing, etc.) are reasonably set and optimized according to actual engineering design experience, experimental test data and simulation analysis results. In the actual product research and production process, further fine tuning can be carried out according to the specific application scene and technical requirements to ensure that the improved hydraulic valve of the utility model can achieve the best performance and working effect.

Claims

1. Improved hydraulic valve comprising a hydraulic valve body (100), characterized in that: The hydraulic valve body (100) comprises: a valve body (110) provided with an oil inlet (111) and an oil outlet (112); a valve core (113) arranged in the valve body (110) and capable of reciprocating in the valve body (110) to control the communication state of each oil port; a sealing assembly composed of a plurality of layers of sealing structures arranged between the valve core (113) and the inner wall of the valve body (110), the layers of sealing structures are graphite sealing rings (116), rubber annular rings (117) and metal sealing pads (118) from inside to outside, the graphite sealing rings (116) are tightly attached to the valve core (113), the rubber annular rings (117) are located outside the graphite sealing rings (116), and the metal sealing pads (118) are located outside the rubber annular rings (117) and tightly contact with the inner wall of the valve body (110); a driving mechanism comprising an electromagnet (114) arranged at one end of the valve body (110) and a return spring (115) connected between the valve core (113) and the end of the valve body (110) for accurately resetting the valve core (113) when the electromagnet (114) is powered off.

2. The improved hydraulic valve as claimed in claim 1, wherein: An outer wear-resistant coating (119) is arranged on the outer surface of the metal sealing pad (118), and the outer wear-resistant coating (119) is made of titanium nitride material.

3. The improved hydraulic valve as claimed in claim 1, wherein: A filter (120) is detachably installed on the oil inlet (111) and the oil outlet (112).

4. The improved hydraulic valve as claimed in claim 2, wherein: The thickness of the outer wear-resistant coating (119) is 6 microns.

5. The improved hydraulic valve as claimed in claim 3, wherein: The filter (120) is internally provided with a plurality of layers of filter screens with different precision, including coarse filter screens, fine filter screens and precision filter screens.

6. The improved hydraulic valve as claimed in claim 3, wherein: The connection mode of the filter (120) and the oil inlet (111) and the oil outlet (112) adopts threaded connection.

7. The improved hydraulic valve as claimed in claim 6, wherein: The shell of the filter (120) is made of stainless steel.

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