Hydraulic valve seal structure suitable for high water-based emulsion

Abstract

The application discloses a hydraulic valve sealing structure suitable for a high water-based emulsion, which comprises a valve body provided with a first valve core in a valve cavity, a first valve sleeve and a second valve sleeve arranged in the valve body, a second spring seat and a first valve seat arranged in the first valve sleeve, a third spring seat and a second valve seat arranged in the second valve sleeve, and the first valve core penetrating through the centers of the first valve seat and the second valve seat; the end surfaces of the first valve seat, the second valve seat and the valve core are subjected to surface surfacing treatment, and the welding material is soft metal; the two ends of the first valve seat are in close abutment with the second spring seat and the valve core at the same time; the first valve seat is floated under the action of the second spring seat, so that the first valve seat is always extruded with the end surface of the valve core, the position of the valve core in the vertical direction is limited by the first valve seat and the second valve seat, the soft metal is slightly deformed under the contact extrusion of the hard alloy, better metal shearing sealing effect can be obtained, the leakage is small, and the use requirement of the hydraulic valve is met.

Description

Technical Field

[0001] This invention belongs to the field of hydraulic valve sealing technology, and particularly relates to a hydraulic valve sealing structure suitable for high water-based emulsions. Background Technology

[0002] In 1795, Joseph Bramah of England invented the first truly functional hydraulic device in human history—the hydraulic press—marking the effective beginning of modern hydraulic technology. For nearly a century afterward, it was widely used in pressure forming machines, material testing machines, port cranes, and smelters. However, due to the limitations of water's low viscosity, poor lubricity, high steam pressure, and corrosiveness, as well as the level of scientific and technological development at the time, the severe technical problems faced by hydraulic components, such as friction and wear, corrosion, cavitation, and leakage, could not be effectively solved, thus hindering further improvements in the performance of components and systems.

[0003] With the progress of human society and the development of science and technology, environmental, resource, and population issues have received increasing attention. In 1987, the World Commission on Environment and Development first proposed the concept of sustainable development. Since then, green manufacturing, which saves energy, conserves resources, protects the environment, and protects labor, has become the primary goal of modern mechanical engineering development, posing a severe challenge to hydraulic technology.

[0004] To meet the needs of sustainable development and promote green manufacturing, since the 1980s, the United States, Japan, the European Community, and other countries have established dedicated hydraulic transmission research committees. The aim is to concentrate efforts on researching key fundamental technologies for hydraulic transmission, developing high-performance hydraulic components and systems, popularizing and promoting hydraulic transmission technology, exploring new application areas, and advancing the development of modern hydraulic transmission technology. In the early 21st century, international hydraulic transmission technology had reached pressure levels of 14–21 MPa, with the overall performance of components reaching or even exceeding that of existing hydraulic components. These components are widely used in mining, steel, food processing, water treatment plants, road cleaning machinery, nuclear power, underwater operations, and marine development.

[0005] The working medium of hydraulic directional control valves is a water-based fluid. High-water-based emulsions are liquids emulsified from 95% pure water and 5% emulsion, along with relevant additives. Their physical properties are similar to pure water, but they offer significant improvements in lubrication and corrosion resistance. However, the low viscosity of high-water-based emulsions leads to sealing issues. Under the same conditions, the viscosity of 32# hydraulic oil is tens of times higher than that of the emulsion, resulting in several times greater leakage when using the same sealing structure. Therefore, to ensure that the leakage of the hydraulic valve does not exceed 0.2 ml / min after tens of thousands of safe operations, extremely stringent requirements are placed on the hydraulic valve's manufacturing process, significantly increasing the manufacturing difficulty. However, based on current manufacturing capabilities, the dimensional and positional tolerances of the valve body bore can only reach IT6 level accuracy as specified in relevant standards, and the valve core can only reach IT5 level accuracy. Therefore, it is difficult to guarantee the design requirements from a manufacturing perspective. Consequently, traditional gap seals cannot meet the operational needs of hydraulic valves. Summary of the Invention

[0006] To address the above problems, this invention provides a hydraulic valve sealing structure suitable for high water-based emulsions.

[0007] This invention is implemented as follows: A hydraulic valve sealing structure suitable for high-water-based emulsions includes a valve body with a valve cavity formed through the center of the valve body's cross-section. A valve core is movably disposed within the valve cavity and moves along the valve cavity. Pilot valves are fixedly disposed at both ends of the valve body, and an electromagnet is fixedly disposed at the upper end of the pilot valve. A support seat and a first spring seat are respectively disposed at the connection between the valve body and the pilot valve. A first piston and a second piston are connected to both ends of the valve core. The other end of the first piston tightly passes through the central hole of the support seat and moves along the central hole of the support seat. The support seat limits the position of the first piston to prevent positional deviation during movement. The other end of the second piston abuts against a spring in the first spring seat. The first spring seat supports the spring, and the spring deforms under the action of the second piston.

[0008] A first valve sleeve and a second valve sleeve are symmetrically fixedly arranged, passing through the center of the valve body and perpendicular to the valve core, to support and define the positions of the second spring seat, the first valve seat, the third spring seat, and the second valve seat. The second spring seat and the first valve seat are firmly disposed within the first valve sleeve to ensure their stable positions. Similarly, the third spring seat and the second valve seat are firmly disposed within the second valve sleeve to ensure their stable positions. The valve core passes sequentially through the center of the first valve seat and the second valve seat. Both ends of the first valve seat and the second spring seat are simultaneously and tightly abutted against the valve core. The first valve seat... The second valve seat floats under the action of the second spring seat, ensuring that the first valve seat is always pressed against the end face of the valve core to maintain reasonable stress. Both ends of the second valve seat are simultaneously in close contact with the valve core along with the third spring seat. The second valve seat floats under the action of the third spring seat, ensuring that it is always pressed against the end face of the valve core to maintain reasonable stress. The first and second valve seats limit the vertical position of the valve core. The upper and lower end faces of the valve core are smooth planes, ensuring both tight contact between the first and second valve seats and the valve core, and smooth movement of the valve core along the first and second valve seats.

[0009] The first valve seat has a first slot, the second valve seat has a second slot, and the bottom of the valve body has a third slot communicating with the valve cavity. A first through hole, a second through hole, and a third through hole are arranged side-by-side along the axis of the valve core, penetrating the valve core. The first through hole and the second through hole are connected, and the distance between the first through hole and the second through hole is the same as the distance between the first slot and the second slot. Normal hydraulic oil flow is allowed along the first slot, the second slot, the third slot, the first through hole, the second through hole, and the third through hole.

[0010] The first valve seat, the second valve seat, and the valve core are made of hard alloy to ensure their strength. The end faces of the first valve seat, the second valve seat, and the valve core that come into contact with each other are surface-mounted with welded material. The welded material is soft metal, which can undergo micro-deformation. The soft metal undergoes micro-deformation under the contact extrusion of the hard alloy, which can achieve a better metal shear sealing effect.

[0011] Preferably, the first valve seat, the second valve seat, and the valve core are made of nickel-cobalt alloy, which has excellent heat resistance, corrosion resistance, and good processing performance. The yield strength of the nickel-cobalt alloy is above 1000MPa, and it has high hardness.

[0012] Preferably, the welding material of the contact surfaces of the first valve seat, the second valve seat and the valve core is aluminum bronze, and the yield strength of aluminum bronze is above 200MPa.

[0013] Preferably, the diameter of the first through hole is the same as the diameter of the first slot, and the diameters of the second through hole and the third through hole are the same as the diameter of the second slot, so as to ensure that the hydraulic oil flows smoothly when connected.

[0014] Preferably, O-rings are provided at the connection points between the first valve sleeve and the second valve sleeve and the valve body, the connection points between the first valve seat and the first valve sleeve, and the connection points between the second valve seat and the second valve sleeve to ensure tight contact between the first valve seat, the first valve sleeve, the second valve seat, the second valve sleeve and the valve body, and to prevent hydraulic oil leakage.

[0015] Preferably, when the valve core is in the initial state, the third through hole is connected to the second slot hole; when the valve core is in the working state, the first through hole is connected to the first slot hole, and the second through hole is connected to the second slot hole, to ensure reliable flow of hydraulic oil.

[0016] Preferably, a fourth through hole is provided on the side wall of the valve core, and the fourth through hole is connected to the third through hole. The width a of the valve cavity is greater than the width b of the valve core. When the hydraulic system fails, the hydraulic oil can flow back along the second slot, the third through hole, the fourth through hole, the valve cavity and the third slot to achieve unloading.

[0017] Preferably, the first piston and the second piston are the same size as the valve chamber to prevent hydraulic oil leakage. The first piston and the second piston are firmly connected to the valve core to prevent the valve core from deflecting and to ensure reliable communication between the first through hole, the second through hole and the third through hole and the first slot and the second slot.

[0018] Preferably, a valve cover is provided at the upper end of the valve body, and a valve plate is provided at the lower end of the valve body to improve the strength of the valve body.

[0019] The beneficial effects of this invention are as follows: The invention has a reasonable structural design. Both ends of the first valve seat and the second spring seat are tightly abutted against the valve core. The first valve seat floats under the action of the second spring seat, ensuring that the first valve seat is always pressed against the end face of the valve core, maintaining reasonable stress. Both ends of the second valve seat and the third spring seat are tightly abutted against the valve core. The second valve seat floats under the action of the third spring seat, ensuring that the second valve seat is always pressed against the end face of the valve core, maintaining reasonable stress. The first and second valve seats limit the vertical position of the valve core. The first, second, and valve cores are made of hard alloy, ensuring their strength. The contact surfaces of the first, second, and valve cores are surface-welded with a soft metal. The soft metal undergoes slight deformation under the contact compression of the hard alloy, achieving a better metal shear sealing effect and meeting the requirement of internal leakage of less than 0.2 ml / min, thus satisfying the application requirements of hydraulic valves. Attached Figure Description

[0020] Figure 1 This is a schematic diagram of the structure of the present invention;

[0021] Figure 2 This is a schematic diagram of the valve core structure;

[0022] Figure 3 This is a schematic diagram of the cross-sectional structure of the valve core in the valve cavity;

[0023] Figure 4 This is a schematic diagram of the microstructure of the first valve seat and valve core when they are not clamped together.

[0024] Figure 5 This is a schematic diagram of the microstructure of the first valve seat and valve core during the initial stage of clamping.

[0025] Figure 6 This is a schematic diagram of the microstructure when the first valve seat and valve core are fully clamped together.

[0026] In the diagram: 1. Valve body; 2. Valve chamber; 3. Valve core; 4. Pilot valve; 5. Electromagnet; 6. Support seat; 7. First spring seat; 8. First piston; 9. Second piston; 10. Spring; 11. First valve sleeve; 12. Second valve sleeve; 13. Second spring seat; 14. First valve seat; 15. Third spring seat; 16. Second valve seat; 17. First slot; 18. Second slot; 19. Third slot; 20. First through hole; 21. Second through hole; 22. Third through hole; 23. O-ring seal; 24. Fourth through hole; 25. Valve cover; 26. Valve plate. Detailed Implementation

[0027] To better understand the technical solution of the present invention, the present invention will be further described below with reference to the accompanying drawings.

[0028] like Figure 1-6The hydraulic valve sealing structure shown is suitable for high water-based emulsions. It includes a valve body 1, with a valve cover 25 at the upper end and a valve plate 26 at the lower end to improve the strength of the valve body 1. A valve cavity 2 is formed through the center of the cross-section of the valve body 1, and a valve core 3 is movably disposed within the valve cavity 2. The valve core 3 moves along the valve cavity 2. Pilot valves 4 are fixedly disposed at both ends of the valve body 1, and an electromagnet 5 is fixedly disposed at the upper end of the pilot valve 4. A support seat 6 and a first spring seat 7 are respectively disposed at the connection between the valve body 1 and the pilot valve 4. A first piston 8 and a second piston 9 are connected to both ends of the valve core 3. The other end of the first piston 8 tightly passes through the central hole of the support seat 6. The piston 8 moves along the center hole of the support seat 6, which limits the position of the first piston 8 and prevents it from deflecting during movement. The other end of the second piston 9 abuts against the spring 10 in the first spring seat 7, which supports the spring 10. The spring 10 deforms under the action of the second piston 9. The first piston 8 and the second piston 9 are the same size as the valve chamber 2 to prevent hydraulic oil leakage. The first piston 8 and the second piston 9 are firmly connected to the valve core 3 to prevent the valve core 3 from deflecting and to ensure reliable communication between the first through hole 20, the second through hole 21, and the third through hole 22 and the first slot 17 and the second slot 18.

[0029] A first valve sleeve 11 and a second valve sleeve 12 are symmetrically fixedly arranged through the center of the valve body 1 and perpendicular to the valve core 3, supporting and defining the positions of the second spring seat 13, the first valve seat 14, the third spring seat 15, and the second valve seat 16. The second spring seat 13 and the first valve seat 14 are firmly housed within the first valve sleeve 11 to ensure their stable positions. Similarly, the third spring seat 15 and the second valve seat 16 are firmly housed within the second valve sleeve 12 to ensure their stable positions. O-rings 23 are provided at the connections between the first and second valve sleeves 11 and the valve body 1, the first valve seat 14 and the first valve sleeve 11, and the second valve seat 16 and the second valve sleeve 12, ensuring tight contact between these components and preventing hydraulic oil leakage. The valve core 3 passes sequentially through the centers of the first valve seat 14 and the second valve seat 16. Both ends of the first valve seat 14 and the second spring seat 13 are in close contact with the valve core 3. The first valve seat 14 floats under the action of the second spring seat 13, ensuring that the first valve seat 14 is always pressed against the end face of the valve core 3, maintaining reasonable stress. Both ends of the second valve seat 16 are in close contact with the valve core 3 along with the third spring seat 15. The second valve seat 16 floats under the action of the third spring seat 15, ensuring that the second valve seat 16 is always pressed against the end face of the valve core 3, maintaining reasonable stress. The first valve seat 14 and the second valve seat 16 define the vertical position of the valve core 3. The upper and lower end faces of the valve core 3 are smooth planes, ensuring both close contact between the first valve seat 14, the second valve seat 16, and the valve core 3, and smooth movement of the valve core 3 along the first valve seat 14 and the second valve seat 16.

[0030] The first valve seat 14 has a first slot 17, the second valve seat 16 has a second slot 18, and the bottom of the valve body 1 has a third slot 19 communicating with the valve cavity 2. A first through hole 20, a second through hole 21, and a third through hole 22 are provided side-by-side along the axis of the valve core 3, penetrating the valve core 3. The first through hole 20 and the second through hole 21 are connected, and the distance between the first through hole 20 and the second through hole 21 is the same as the distance between the first slot 17 and the second slot 18. Normal hydraulic oil flow occurs along the first slot 17, the second slot 18, the third slot 19, the first through hole 20, the second through hole 21, and the third through hole 22. The diameter of the first through hole 20 is the same as the diameter of the first slot 17. The diameters of the second through hole 21 and the third through hole 22 are the same as the diameter of the second slot 18, ensuring smooth flow of hydraulic oil when connected. When the valve core 3 is in the initial state, the third through hole 22 is connected to the second slot 18. When the valve core 3 is in the working state, the first through hole 20 is connected to the first slot 17, and the second through hole 21 is connected to the second slot 18, ensuring reliable flow of hydraulic oil. A fourth through hole 24 is provided on the side wall of the valve core 3, and the fourth through hole 24 is connected to the third through hole 22. The width a of the valve cavity 2 is greater than the width b of the valve core 3. When a hydraulic system malfunctions, the hydraulic oil can flow back along the second slot 18, the third through hole 22, the fourth through hole 24, the valve cavity 1, and the third slot 19, achieving unloading.

[0031] The first valve seat 14, the second valve seat 16, and the valve core 3 are made of nickel-cobalt alloy, which has excellent heat resistance, corrosion resistance, and good processing performance. The yield strength of nickel-cobalt alloy is above 1000MPa, and its high hardness ensures the strength of the first valve seat 14, the second valve seat 16, and the valve core 3. The end faces of the first valve seat 14, the second valve seat 16, and the valve core 3 that are in contact with each other are surface-mounted with aluminum bronze. The yield strength of aluminum bronze is above 200MPa, which can undergo micro-deformation. The soft metal undergoes micro-deformation under the contact extrusion of the hard alloy, which can achieve a better metal shear sealing effect.

[0032] The above description is only a preferred embodiment of the present invention. Therefore, all equivalent changes or modifications made to the structure, features and principles described in the claims of this patent application are included in the scope of this patent application.

Claims

1. A hydraulic valve sealing structure suitable for high water-based emulsions, comprising a valve body, a valve cavity formed through the center of the cross-section of the valve body, a valve core movably disposed within the valve cavity, pilot valves fixedly disposed at both ends of the valve body, and an electromagnet fixedly disposed at the upper end of the pilot valve, characterized in that, A support seat and a first spring seat are respectively provided at the connection between the valve body and the pilot valve. A first piston and a second piston are connected to both ends of the valve core. The other end of the first piston passes tightly through the central hole of the support seat, and the other end of the second piston abuts against the spring inside the first spring seat. A first valve sleeve and a second valve sleeve are symmetrically fixedly arranged, passing through the center of the valve body and perpendicular to the valve core. A second spring seat and a first valve seat are firmly disposed within the first valve sleeve, and a third spring seat and a second valve seat are firmly disposed within the second valve sleeve. The valve core passes sequentially through the center of the first valve seat and the second valve seat. Both ends of the first valve seat and the second spring seat are simultaneously and tightly abutted against the valve core. Both ends of the second valve seat and the third spring seat are simultaneously and tightly abutted against the valve core. The upper and lower end faces of the valve core are smooth planes. The first valve seat has a first slot, the second valve seat has a second slot, and the bottom of the valve body has a third slot communicating with the valve cavity. A first through hole, a second through hole, and a third through hole are arranged side-by-side on the axis of the valve core, penetrating the valve core. The first through hole and the second through hole are connected, and the distance between the first through hole and the second through hole is the same as the distance between the first slot and the second slot. The first valve seat, the second valve seat, and the valve core are all made of hard alloy. The end faces of the first valve seat, the second valve seat, and the valve core that come into contact with each other are surface-mounted with a soft metal. A fourth through hole is provided on the side wall of the valve core, and the fourth through hole is connected to the third through hole. The width a of the valve cavity is greater than the width b of the valve core.

2. The hydraulic valve sealing structure suitable for high water-based emulsions according to claim 1, characterized in that, The first valve seat, the second valve seat, and the valve core are made of nickel-cobalt alloy.

3. The hydraulic valve sealing structure suitable for high water-based emulsions according to claim 1, characterized in that, The welding material of the contact surfaces of the first valve seat, the second valve seat and the valve core is aluminum bronze.

4. The hydraulic valve sealing structure suitable for high water-based emulsions according to claim 1, characterized in that, The diameter of the first through hole is the same as the diameter of the first slot, and the diameters of the second through hole and the third through hole are the same as the diameter of the second slot.

5. The hydraulic valve sealing structure suitable for high water-based emulsions according to claim 1, characterized in that, O-rings are provided at the connections between the first and second valve sleeves and the valve body, the connection between the first valve seat and the first valve sleeve, and the connection between the second valve seat and the second valve sleeve.

6. The hydraulic valve sealing structure suitable for high water-based emulsions according to claim 1, characterized in that, When the valve core is in the initial state, the third through hole is connected to the second slot. When the valve core is in the working state, the first through hole is connected to the first slot, and the second through hole is connected to the second slot.

7. The hydraulic valve sealing structure suitable for high water-based emulsions according to claim 1, characterized in that, The first piston and the second piston are the same size as the valve chamber, and the first piston and the second piston are firmly connected to the valve core.

8. The hydraulic valve sealing structure suitable for high water-based emulsions according to claim 1, characterized in that, The upper end of the valve body is provided with a valve cover, and the lower end of the valve body is provided with a valve plate.

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