A high pressure hydraulic valve

Abstract

This invention relates to a high-pressure hydraulic valve for use in the field of hydraulic valves. It includes a mounting cavity, with the upper end of a valve block slidably connected within the mounting cavity. An intermediate sliding plate is also slidably connected within the mounting cavity, located at the upper end of the valve block. The valve block and the intermediate sliding plate, as well as the intermediate sliding plate and the top wall of the mounting cavity, are elastically connected by compression springs. The maximum stroke of the piston rod is less than the height of the mounting cavity, and the maximum stroke of the valve block is less than half the height of the mounting cavity. An annular first pressure relief chamber is formed in the inner wall of the mounting cavity. The first pressure relief chamber is located at the lower end of the mounting cavity near the opening and is not connected to the opening. When the valve block is raised to its highest point, the horizontal height of its lower end is higher than the horizontal height of the bottom wall of the first pressure relief chamber. By employing the aforementioned two compression springs and the first pressure relief chamber, the high-pressure hydraulic valve can autonomously reduce pressure from larger pressures, thereby reducing the probability of damage to the valve body and valve block and extending the service life of the high-pressure hydraulic valve.

Description

Technical Field

[0001] The present invention relates to a hydraulic valve, and more particularly to a high-pressure hydraulic valve used in the field of hydraulic valves. Background Technology

[0002] With the development of technology, the diameter of transmission pipelines is getting smaller and smaller, but the pressure they bear remains unchanged. When connecting pipelines, high-pressure hydraulic valves are installed on them for convenient management. In the existing technology, high-pressure hydraulic valves are often operated by handwheels or handles. However, handwheels or handles are often exposed and are prone to accidental operation due to collisions, increasing the probability of safety hazards and resulting in poor safety. Therefore, it is necessary to design a high-pressure hydraulic valve to solve the above problems.

[0003] Chinese Utility Model Patent Publication No. CN213512333U discloses a high-pressure hydraulic valve, including a valve body and a valve stem mounted on the valve body. A cylindrical cover is fixedly connected to the upper end of the valve seat of the valve body. Four sets of movable rods are equidistantly mounted on the upper end of the valve stem through the cylindrical cover. An annular fixing plate is fixedly connected to the lower annular outer end of the cylindrical cover. A protective cylinder is slidably connected to the upper end of the cylindrical cover and extends into the interior of the protective cylinder. At least two guide rods arranged in annular pattern are equidistantly arranged on the lower end of the protective cylinder, with the guide rods located outside the cylindrical cover. The lower ends of at least two guide rods penetrate the annular fixing plate. At least two springs are equidistantly arranged between the annular fixing plate and the protective cylinder. A rubber column is fixedly connected to the upper end of the protective cylinder, extending into the interior of the protective cylinder. Four movable rods are arranged at an angle inside the rubber column. This design uses the rubber column to retract and protect the four movable rods, effectively preventing accidental operation of the valve body and improving safety.

[0004] Existing high-pressure hydraulic valves typically rely on their own strength to withstand the pressure of high-pressure liquid. However, long-term load and valve opening / closing processes can easily lead to damage to the valve body and valve block, affecting the normal operation of the high-pressure hydraulic valve. Summary of the Invention

[0005] In view of the above-mentioned prior art, the technical problem to be solved by the present invention is how to enable the high-pressure hydraulic valve to autonomously reduce the pressure (near load / maximum pressure or full load), thereby reducing the probability of damage to the valve body and valve block and extending the service life of the high-pressure hydraulic valve.

[0006] To solve the above problems, the present invention provides a high-pressure hydraulic valve, including a valve body, with an oil inlet and an oil outlet at both ends of the valve body, and a pressure oil circuit and a hydraulic chamber connected to one end of the pressure oil circuit. The other end of the pressure oil circuit is connected to the lower end of the opening of the oil inlet. A piston rod is slidably connected in the hydraulic chamber. The upper end of the piston rod slides through the valve body and extends to the lower end of the connection between the oil inlet and the oil outlet. A valve block is slidably arranged at the connection between the oil inlet and the oil outlet. The piston rod is located at the lower end of the valve block and is used to drive the valve block to rise.

[0007] An installation cavity is provided at the upper end of the connection between the oil inlet and the oil outlet, and the upper end of the valve block is slidably connected to the installation cavity;

[0008] A middle sliding plate is also slidably connected inside the mounting cavity. The middle sliding plate is located at the upper end of the valve block. The valve block and the middle sliding plate, as well as the middle sliding plate and the top wall of the mounting cavity, are elastically connected by compression springs.

[0009] The maximum stroke of the piston rod is less than the height of the mounting cavity, and the maximum stroke of the valve block is less than half the height of the mounting cavity;

[0010] The inner wall of the mounting cavity has an annular first pressure relief chamber. The first pressure relief chamber is located at the lower end of the mounting cavity near the opening and is not connected to the opening of the mounting cavity. When the valve block is raised to the highest position, the horizontal height of the lower end is higher than the horizontal height of the bottom wall of the first pressure relief chamber.

[0011] In the above-mentioned high-pressure hydraulic valve, two compression springs are used to share the pressure on the balance valve block, so that the valve block can perform a smooth extension and retraction movement in the overall oil circuit. The two compression springs can not only share the pressure with each other to avoid damage, but also ensure that the balance valve block can still work normally when one of the compression springs is damaged.

[0012] Meanwhile, the first pressure relief chamber is designed so that when the pressure is high, the valve block moves upward a long distance under the lifting action of the piston rod and the pressure of the oil circuit itself. Then, the first pressure relief chamber is connected to the oil circuit, allowing some of the medium in the oil circuit to enter the first pressure relief chamber. This is equivalent to expanding the width of the oil circuit at that point, thereby reducing the pressure generated by the medium in that section and playing the role of automatic pressure reduction and pressure balance.

[0013] This allows the high-pressure hydraulic valve to autonomously reduce pressure when it encounters high pressure, thereby reducing the probability of damage to the valve body and valve block and extending the service life of the high-pressure hydraulic valve.

[0014] As another improvement of this application, a second pressure relief chamber is provided on the inner wall of the mounting cavity. The second pressure relief chamber is located at the lower end of the mounting cavity and above the first pressure relief chamber. When the valve block is raised to its highest position, the horizontal height of the lower end is higher than the horizontal height of the bottom wall of the second pressure relief chamber.

[0015] As another improvement of this application, an annular third pressure relief chamber is provided on the inner wall of the hydraulic chamber. When the piston rod is in the initial position, the bottom horizontal height of the piston rod is lower than the bottom horizontal height of the third pressure relief chamber. When the piston rod is in the highest position, the bottom horizontal height of the piston rod is higher than the bottom horizontal height of the third pressure relief chamber.

[0016] As another improvement of this application, a pressure relief oil passage is provided on the side of the inner wall of the mounting cavity near the oil outlet opening, which is connected to the oil outlet. The opening of the pressure relief oil passage connected to the mounting cavity is located above the first pressure relief cavity and below the middle slide plate. When the valve block rises to the highest position, the horizontal height of the lower end of the valve block is higher than the horizontal height of the top of the pressure relief oil passage.

[0017] As a supplement to another improvement of this application, the cross-section of the pressure relief oil passage is "¬", and the inner diameter of the pressure relief oil passage gradually increases from the end near the mounting cavity to the end connected to the oil outlet.

[0018] As a further improvement to this application, a vortex cavity is formed on the outer side of the bend in the pressure relief oil passage. The cross-section of the vortex cavity is semi-circular, and the diameter of the vortex cavity is larger than the diameter of the pressure relief oil passage at that location.

[0019] As a supplement to another improvement of this application, an arc-shaped pressure-balancing transition zone is formed at the lower end of the vortex cavity. The pressure-balancing transition zone protrudes into the pressure relief oil passage, and the pressure-balancing transition zone, the vortex cavity, and the pressure relief oil passage at that location form an "R"-shaped cavity.

[0020] As a further improvement to this application, the third pressure relief chamber is located in the upper half of the hydraulic chamber and close to the top wall of the hydraulic chamber.

[0021] As a further improvement to this application, the third pressure relief chamber is located in the lower half of the hydraulic chamber and near the upper end of the piston rod plug.

[0022] In summary, using two compression springs to share the pressure on the balance valve block allows the valve block to move smoothly in the overall oil circuit. The two compression springs not only share the pressure to prevent damage, but also ensure that the balance valve block can still work normally even if one of the compression springs is damaged.

[0023] Meanwhile, the first pressure relief chamber is designed so that when the pressure is high, the valve block moves upward a long distance under the lifting action of the piston rod and the pressure of the oil circuit itself. Then, the first pressure relief chamber is connected to the oil circuit, allowing some of the medium in the oil circuit to enter the first pressure relief chamber. This is equivalent to expanding the width of the oil circuit at that point, thereby reducing the pressure generated by the medium in that section and playing the role of automatic pressure reduction and pressure balance.

[0024] This allows the high-pressure hydraulic valve to autonomously reduce pressure when it encounters high pressure, thereby reducing the probability of damage to the valve body and valve block and extending the service life of the high-pressure hydraulic valve. Attached Figure Description

[0025] Figure 1 This is a schematic diagram of the structure of the first embodiment of this application;

[0026] Figure 2 This is a schematic diagram of the structure of the second embodiment of this application;

[0027] Figure 3 This is a schematic diagram of the structure of the third embodiment of this application;

[0028] Figure 4 This is a schematic diagram of the structure of the fourth embodiment of this application;

[0029] Figure 5 for Figure 4 Enlarged view of the structure at point A in the middle;

[0030] Figure 6 This is a schematic diagram of the structure of the fifth embodiment of this application;

[0031] Figure 7 This is a schematic diagram of the flow direction of the hydraulic medium (dashed arrow, the same below) and the movement direction of the hardware structure (solid arrow, the same below) in the first embodiment of this application.

[0032] Figure 8 This is a schematic diagram of the flow direction of the hydraulic medium and the movement direction of the hardware structure in the second embodiment of this application.

[0033] Figure 9 This is a schematic diagram of the flow direction of the hydraulic medium and the movement direction of the hardware structure in the third embodiment of this application.

[0034] Figure 10 This is a schematic diagram of the flow direction of the hydraulic medium and the movement direction of the hardware structure in the fourth embodiment of this application.

[0035] Figure 11 This is a schematic diagram of the flow direction of the hydraulic medium and the movement direction of the hardware structure in the fifth embodiment of this application.

[0036] Explanation of the labels in the diagram:

[0037] 1. Valve body; 11. Oil inlet; 12. Oil outlet; 13. Pressure oil circuit; 14. Oil pressure chamber; 15. First pressure relief chamber; 16. Second pressure relief chamber; 17. Third pressure relief chamber; 18. Pressure relief oil circuit; 181. Swirl chamber; 182. Pressure equalization transition zone; 2. Piston rod; 3. Valve block; 4. Intermediate slide plate; 5. Compression spring. Detailed Implementation

[0038] The following describes five embodiments of this application in detail with reference to the accompanying drawings.

[0039] Implementation method 1:

[0040] This invention provides a high-pressure hydraulic valve; please refer to [link / reference]. Figure 1 and Figure 7 The valve body includes a valve body 1, with an oil inlet 11 and an oil outlet 12 at both ends. The valve body 1 also has a pressure oil passage 13 and a hydraulic chamber 14 connected to one end of the pressure oil passage 13. The other end of the pressure oil passage 13 is connected to the lower end of the opening of the oil inlet 11. A piston rod 2 is slidably connected in the hydraulic chamber 14. The upper end of the piston rod 2 slides through the valve body 1 and extends to the lower end of the connection between the oil inlet 11 and the oil outlet 12. A valve block 3 is slidably arranged at the connection between the oil inlet 11 and the oil outlet 12. The piston rod 2 is located at the lower end of the valve block 3 and is used to drive the valve block 3 to rise.

[0041] An installation cavity is provided at the upper end of the connection between the oil inlet 11 and the oil outlet 12, and the upper end of the valve block 3 is slidably connected to the installation cavity.

[0042] A middle sliding plate 4 is also slidably connected inside the mounting cavity. The middle sliding plate 4 is located at the upper end of the valve block 3. The valve block 3 and the middle sliding plate 4, as well as the middle sliding plate 4 and the top wall of the mounting cavity, are elastically connected by compression springs 5.

[0043] The maximum stroke of piston rod 2 is less than the height of the mounting cavity, and the maximum stroke of valve block 3 is less than half the height of the mounting cavity;

[0044] The inner wall of the mounting cavity is provided with an annular first pressure relief chamber 15. The first pressure relief chamber 15 is located at the lower end of the mounting cavity near the opening and is not connected to the opening of the mounting cavity. When the valve block 3 is raised to the highest position, the horizontal height of the lower end is higher than the horizontal height of the bottom wall of the first pressure relief chamber 15.

[0045] Based on the above structure, two compression springs 5 ​​are used to share the pressure on the balance valve block 3, so that the valve block 3 can perform a smooth extension and retraction movement in the overall oil circuit. The two compression springs 5 ​​can not only share the pressure with each other to avoid damage, but also ensure that the balance valve block 3 can still work normally when one of the compression springs 5 ​​is damaged.

[0046] Meanwhile, the first pressure relief chamber 15 is designed so that when the pressure is high, the valve block 3 moves upward a long distance under the lifting action of the piston rod 2 and the pressure of the oil circuit itself. Then, the first pressure relief chamber 15 is connected to the oil circuit, so that some of the medium in the oil circuit enters the first pressure relief chamber 15. This is equivalent to expanding the width of the oil circuit at that point, thereby reducing the pressure generated by the medium in that section and playing the role of automatic pressure reduction and pressure balance.

[0047] This allows the high-pressure hydraulic valve to autonomously reduce pressure at higher pressures (near load / maximum pressure or full load), thereby reducing the probability of damage to valve body 1 and valve block 3 and extending the service life of the high-pressure hydraulic valve.

[0048] The second implementation method:

[0049] Figure 2 and Figure 8 A high-pressure hydraulic valve is shown, which differs from Embodiment 1 in that a second pressure relief chamber 16 is provided in the inner wall of the mounting cavity. The second pressure relief chamber 16 is located at the lower end of the mounting cavity and above the first pressure relief chamber 15. When the valve block 3 is raised to its highest position, the horizontal height of its lower end is higher than the horizontal height of the bottom wall of the second pressure relief chamber 16.

[0050] With the second pressure relief chamber 16, when the pressure is greater than that described in Embodiment 1, the valve block 3 can continue to rise, so that both the second pressure relief chamber 16 and the first pressure relief chamber 15 are connected to the oil circuit, thereby further expanding the width of the oil circuit at that point, performing secondary pressure reduction, resulting in a better pressure reduction effect, which is more conducive to pressure reduction protection of the valve body 1 and the valve block 3, and further extending the service life of the high-pressure hydraulic valve.

[0051] The third implementation method:

[0052] Figure 3 and Figure 9 A high-pressure hydraulic valve is shown, which differs from Embodiment 1 or Embodiment 2 in that an annular third pressure relief chamber 17 is provided on the inner wall of the hydraulic chamber 14. When the piston rod 2 is in the initial position, the bottom horizontal height of the piston rod 2 is lower than the bottom horizontal height of the third pressure relief chamber 17. When the piston rod 2 is in the highest position, the bottom horizontal height of the piston rod 2 is higher than the bottom horizontal height of the third pressure relief chamber 17. The third pressure relief chamber 17 is located in the upper half of the hydraulic chamber 14 and close to the inner top wall of the hydraulic chamber 14.

[0053] By setting the third pressure relief chamber 17, after the piston rod 2 rises under the influence of the medium pressure in the pressure oil circuit 13, if the plug part of the piston rod 2 (the part with the same horizontal width as the oil pressure chamber 14 shown in the figure) is higher than the third pressure relief chamber 17, the pressure generated by the medium in the oil pressure chamber 14 will be reduced, thereby providing pressure reduction protection for the piston rod 2 and the oil pressure chamber 14, thus avoiding fatigue damage to the oil pressure chamber 14 and the piston rod 2 caused by the influence of large pressure, which is also beneficial to extending the service life of the high-pressure hydraulic valve;

[0054] In this embodiment, the third pressure relief chamber 17 is located in the upper half of the hydraulic chamber 14 and close to the top wall of the hydraulic chamber 14. When the piston rod 2 rises to its maximum height, that is, when the hydraulic chamber 14 is filled with medium, it can perform pressure reduction protection, thereby reducing the pressure of the oil that is close to or slightly exceeds the maximum pressure limit, and playing a critical point protection role.

[0055] The fourth implementation method:

[0056] Figure 4 and Figure 10 A high-pressure hydraulic valve is shown, which differs from embodiments 1-3 in that a pressure relief oil passage 18 communicating with the oil outlet 12 is provided on the side of the inner wall of the mounting cavity near the opening of the oil outlet 12. The opening of the pressure relief oil passage 18 communicating with the mounting cavity is located above the first pressure relief cavity 15 and below the intermediate slide plate 4. When the valve block 3 rises to the highest position, the horizontal height of the lower end of the valve block 3 is higher than the horizontal height of the top of the pressure relief oil passage 18.

[0057] By setting up the pressure relief oil passage 18, the medium that enters the mounting cavity and goes deep (above the first pressure relief cavity 15) can be guided through the pressure relief oil passage 18 to the cavity of the oil outlet 12, thereby achieving the purpose of balancing the pressure at that location and the oil outlet 12, thus relieving the pressure at the mounting cavity, and achieving the effect of balancing the pressure in the middle part and the port of the high-pressure hydraulic valve, which is also beneficial to providing good protection for the high-pressure hydraulic valve.

[0058] Figure 4 As shown, the cross-section of the pressure relief oil passage 18 is "¬". The inner diameter of the pressure relief oil passage 18 gradually increases from the end near the mounting cavity to the end connected to the oil outlet 12. This allows the pressure generated by the medium entering the pressure relief oil passage 18 to gradually decrease, thereby providing pressure reduction protection for the pressure relief oil passage 18 and the connection between the oil outlet 12 and the pressure relief oil passage 18, and preventing damage to the pressure relief oil passage 18 itself from causing damage to the high-pressure hydraulic valve.

[0059] Figure 5 As shown, a vortex cavity 181 is formed on the outer side of the bend of the pressure relief oil passage 18. The cross-section of the vortex cavity 181 is semi-circular, and the diameter of the vortex cavity 181 is larger than the diameter of the pressure relief oil passage 18 at that location. By setting the vortex cavity 181, the medium entering the vortex cavity 181 is in a vortex state and smoothly turns, thereby avoiding a large load on the bend of the pressure relief oil passage 18 and protecting the bend of the pressure relief oil passage 18.

[0060] Figure 5 As shown, an arc-shaped pressure-balancing transition zone 182 is formed at the lower end of the vortex cavity 181. The pressure-balancing transition zone 182 protrudes into the pressure relief oil passage 18. The pressure-balancing transition zone 182, the vortex cavity 181, and the pressure relief oil passage 18 at that location form an "R"-shaped cavity. The pressure-balancing transition zone 182 can balance the pressure of the vortex cavity 181 and the section of the pipeline from the pressure relief oil passage 18 to the oil outlet 12, thereby working with the vortex cavity 181 to achieve a better effect of balancing pressure and reducing pressure.

[0061] Fifth implementation method:

[0062] Figure 6 and Figure 11 A high-pressure hydraulic valve is shown, which is based on Embodiment 3. The only difference between Embodiment 3 and Embodiment 3 is that the third pressure relief chamber 17 is located in the lower half of the oil pressure chamber 14 and close to the upper end of the plug of the piston rod 2.

[0063] In this embodiment, the third pressure relief chamber 17 is located in the lower half of the hydraulic chamber 14 and near the upper end of the plug of the piston rod 2. This allows the hydraulic chamber 14 to be depressurized and protected after the piston rod 2 rises a short distance, thus enabling the hydraulic chamber 14 to withstand greater pressure. Compared with embodiment 3, this embodiment can improve the pressure bearing capacity.

[0064] It should be noted that this embodiment and Embodiment 3 can be used alone or in combination as needed to achieve better pressure resistance and protection.

[0065] In light of current practical needs, the above-described embodiments adopted in this application are not limited to these. Any changes made within the scope of knowledge possessed by those skilled in the art without departing from the concept of this application still fall within the protection scope of this invention.

Claims

1. A high-pressure hydraulic valve, comprising a valve body (1), wherein an oil inlet (11) and an oil outlet (12) are respectively provided at both ends of the valve body (1), a pressure oil passage (13) and an oil pressure chamber (14) connected to one end of the pressure oil passage (13) are also provided in the valve body (1), the other end of the pressure oil passage (13) is connected to the lower end of the opening of the oil inlet (11), a piston rod (2) is slidably connected in the oil pressure chamber (14), the upper end of the piston rod (2) slides through the valve body (1) and extends to the lower end of the connection between the oil inlet (11) and the oil outlet (12), a valve block (3) is slidably provided at the connection between the oil inlet (11) and the oil outlet (12), the piston rod (2) is located at the lower end of the valve block (3) and is used to drive the valve block (3) to rise, characterized in that: An installation cavity is provided at the upper end of the connection between the oil inlet (11) and the oil outlet (12), and the upper end of the valve block (3) is slidably connected to the installation cavity; An intermediate sliding plate (4) is also slidably connected inside the mounting cavity. The intermediate sliding plate (4) is located at the upper end of the valve block (3). The valve block (3) and the intermediate sliding plate (4) are elastically connected by compression springs (5) as are the intermediate sliding plate (4) and the top wall of the mounting cavity. The maximum stroke of the piston rod (2) is less than the height of the mounting cavity, and the maximum stroke of the valve block (3) is less than half the height of the mounting cavity; The inner wall of the mounting cavity is provided with an annular first pressure relief cavity (15). The first pressure relief cavity (15) is located at the lower end of the mounting cavity near the opening and is not connected to the opening of the mounting cavity. When the valve block (3) is raised to the highest position, the horizontal height of the lower end is higher than the horizontal height of the bottom wall of the first pressure relief cavity (15). The inner wall of the mounting cavity is provided with a second pressure relief cavity (16). The second pressure relief cavity (16) is located at the lower end of the mounting cavity and above the first pressure relief cavity (15). When the valve block (3) is raised to the highest position, the horizontal height of the lower end is higher than the horizontal height of the bottom wall of the second pressure relief cavity (16). The inner wall of the hydraulic chamber (14) is provided with an annular third pressure relief chamber (17). When the piston rod (2) is in the initial position, the bottom horizontal height of the piston rod (2) is lower than the bottom horizontal height of the third pressure relief chamber (17). When the piston rod (2) is at its highest position, the bottom horizontal height of the piston rod (2) is higher than the bottom horizontal height of the third pressure relief chamber (17).

2. A high-pressure hydraulic valve according to claim 1, characterized in that: A pressure relief oil passage (18) communicating with the oil outlet (12) is provided on the side of the inner wall of the mounting cavity near the opening of the oil outlet (12). The opening of the pressure relief oil passage (18) communicating with the mounting cavity is located above the first pressure relief cavity (15) and below the middle slide plate (4). When the valve block (3) rises to the highest position, the horizontal height of the lower end of the valve block (3) is higher than the horizontal height of the top of the pressure relief oil passage (18).

3. A high-pressure hydraulic valve according to claim 2, characterized in that: The cross-section of the pressure relief oil passage (18) is "¬", and the inner diameter of the pressure relief oil passage (18) gradually increases from the end near the mounting cavity to the end connected to the oil outlet (12).

4. A high-pressure hydraulic valve according to claim 3, characterized in that: A vortex cavity (181) is formed on the outer side of the bend of the pressure relief oil passage (18). The cross-section of the vortex cavity (181) is semi-circular, and the diameter of the vortex cavity (181) is larger than the diameter of the pressure relief oil passage (18).

5. A high-pressure hydraulic valve according to claim 4, characterized in that: The lower end of the vortex cavity (181) forms an arc-shaped pressure-balancing transition zone (182), which protrudes into the pressure relief oil passage (18). The pressure-balancing transition zone (182), the vortex cavity (181), and the pressure relief oil passage (18) at that location form an "R"-shaped cavity.

6. A high-pressure hydraulic valve according to claim 1, characterized in that: The third pressure relief chamber (17) is located in the upper half of the oil pressure chamber (14) and close to the inner top wall of the oil pressure chamber (14).

7. A high-pressure hydraulic valve according to claim 1, characterized in that: The third pressure relief chamber (17) is located in the lower half of the oil pressure chamber (14) and close to the upper end of the plug of the piston rod (2).

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