High-pressure hydraulic valve

Abstract

The high-pressure hydraulic valve comprises a mounting cavity, the upper end of a valve block is slidably connected into the mounting cavity, a middle sliding plate is further slidably connected into the mounting cavity and located at the upper end of the valve block, the valve block and the middle sliding plate are elastically connected through compression springs, and the middle sliding plate and the inner top wall of the mounting cavity are elastically connected through compression springs. The maximum stroke of the piston rod is smaller than the height of the mounting cavity, the maximum stroke of the valve block is smaller than half of the height of the mounting cavity, and an annular first pressure relief cavity is formed in the inner wall of the mounting cavity, located at the position, close to the opening, of the lower end of the mounting cavity and not communicated with the opening of the mounting cavity. When the valve block is lifted to the highest position, the horizontal height of the lower end of the valve block is larger than that of the bottom wall of the first pressure relief cavity, the two compression springs, the first pressure relief cavity and other structures are adopted, the high-pressure hydraulic valve can automatically reduce large pressure, and therefore the probability that the valve body and the valve block are damaged is reduced, and the service life of the high-pressure hydraulic valve is prolonged.

Description

Technical Field

[0001] The present invention relates to a hydraulic valve, in particular to a high-pressure hydraulic valve applied in the field of hydraulic valves. Background Art

[0002] With the development of science and technology, the diameter of the transmission pipeline is getting smaller and smaller, but the pressure that the transmission pipeline bears has not changed. When the pipeline is connected, in order to facilitate the management of the transmission pipeline, a high-pressure hydraulic valve will be set on the transmission pipeline. In the prior art, the high-pressure hydraulic valve is often operated by a handwheel or a handle, but the handwheel or the handle is often exposed to the outside, and the handwheel or the handle is often rotated due to collision and misoperated, which increases the probability of safety hazards and has poor safety. Therefore, it is necessary to design a high-pressure hydraulic valve to solve the above problems.

[0003] The specification of Chinese patent CN213512333U discloses a high-pressure hydraulic valve, including a valve body and a valve stem installed on the valve body, the upper end of the valve seat of the valve body is fixedly connected to the barrel cover, the upper end of the valve stem penetrates the barrel cover and four groups of movable rods are equidistantly installed, the annular outer end of the lower side of the barrel cover is fixedly connected to the annular fixing plate, the upper end of the barrel cover is slidably connected to the protective barrel and extends into the interior of the protective barrel, at least two guide rods arranged in an annular manner are equidistantly arranged at the lower end of the protective barrel and are located outside the barrel cover, at least two lower ends of the guide rods both penetrate the annular fixing plate, at least two springs are equidistantly arranged between the annular fixing plate and the protective barrel, the upper end of the protective barrel is fixedly connected to a rubber column and the rubber column extends into the interior of the protective barrel, and four movable rods arranged in an inclined manner are arranged inside the rubber column. This design gathers and protects the four movable rods through the rubber column, effectively preventing misoperation of the valve body and improving safety.

[0004] When subjected to the pressure of high-pressure liquid, the existing high-pressure hydraulic valve usually uses its own strength to resist the pressure. During long-term load and valve switching, the valve body and valve block are easily damaged, affecting the normal use 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 itself to autonomously reduce the pressure at a larger 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] In order to solve the above problems, the present invention provides a high-pressure hydraulic valve, including a valve body, an oil inlet and an oil outlet are respectively provided at both ends of the valve body, a pressure oil circuit and an oil pressure chamber connected with one end of the pressure oil circuit are also provided in the valve body, the other end of the pressure oil circuit is connected with the lower end of the opening of the oil inlet, a piston rod is slidably connected in the oil pressure 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 provided 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; 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 in the installation cavity; An intermediate slide is also slidably connected in the installation cavity, and the intermediate slide is located at the upper end of the valve block. The valve block and the intermediate slide, as well as the intermediate slide and the top wall of the installation cavity are elastically connected through compression springs; The maximum stroke of the piston rod is less than the height of the installation cavity, and the maximum stroke of the valve block is less than half of the height of the installation cavity; An annular first pressure relief chamber is provided on the inner wall of the installation chamber. The first pressure relief chamber is located near the opening at the lower end of the installation chamber and is not connected with the opening of the installation chamber. When the valve block rises to the highest point, the horizontal height of the lower end is higher than the horizontal height of the bottom wall of the first pressure relief chamber.

[0007] In the above-mentioned high-pressure hydraulic valve, two compression springs are used to share the pressure on the balancing valve block, so that the valve block can perform a smooth telescopic 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 balancing valve block can work normally when one of the compression springs is damaged. At the same time, the setting of the first pressure relief chamber makes it possible for the valve block to move upward for a long distance under the lifting effect of the piston rod and the self-pressure of the oil circuit when the pressure is high, so that part of the medium in the oil circuit enters the first pressure relief chamber, which is equivalent to expanding the width of the oil circuit at that location, thereby reducing the pressure generated by the medium in this section, and playing the role of automatic pressure reduction and pressure balance; In this way, the high-pressure hydraulic valve can autonomously reduce the pressure at a relatively 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.

[0008] As another improvement of the present application, a second pressure relief chamber is opened on the inner wall of the installation chamber, and the second pressure relief chamber is located at the lower end of the installation chamber and above the first pressure relief chamber. When the valve block rises to the highest point, the horizontal height of the lower end is higher than the horizontal height of the bottom wall of the second pressure relief chamber.

[0009] As another improvement of the present application, an annular third pressure relief chamber is provided on the inner wall of the oil pressure chamber. When the piston rod is in the initial position, the bottom horizontal height of the piston rod is lower than the horizontal height of the bottom wall of the third pressure relief chamber. When the piston rod is at the highest point, the bottom horizontal height of the piston rod is higher than the horizontal height of the bottom wall of the third pressure relief chamber.

[0010] As another improvement of the present application, a pressure relief oil circuit connected to the oil outlet is opened on one side of the inner wall of the installation cavity near the oil outlet opening, and the opening of the pressure relief oil circuit connected to the installation cavity is located above the first pressure relief cavity and below the middle slide plate, and 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 circuit.

[0011] As another improved supplement of the present application, the cross-section of the pressure relief oil circuit is "¬"-shaped, and the inner diameter of the pressure relief oil circuit gradually increases from one end close to the installation cavity to the end connected to the oil outlet.

[0012] As another improvement supplement of the present application, a vortex cavity is formed on the outer side of the bend of the pressure relief oil circuit, the cross-section of the vortex cavity is semicircular, and the diameter of the vortex cavity is larger than the diameter of the pressure relief oil circuit at that location.

[0013] As another improvement supplement of the present application, an arc-shaped equal pressure transition zone is formed at the lower end of the vortex chamber, which protrudes into the pressure relief oil circuit. The overall cross-section of the equal pressure transition zone, the vortex chamber and the pressure relief oil circuit there forms an "R"-shaped cavity.

[0014] As a supplement to another improvement of the present application, the third pressure relief chamber is located in the upper half of the oil pressure chamber and close to the top wall of the oil pressure chamber.

[0015] As a supplement to another improvement of the present application, the third pressure relief chamber is located in the lower half of the oil pressure chamber and close to the upper end of the plug portion of the piston rod.

[0016] In summary, two compression springs are used to share the pressure on the balancing valve block, so that the valve block can perform a smooth telescopic 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 balancing valve block can work normally when one of the compression springs is damaged. At the same time, the setting of the first pressure relief chamber makes it possible for the valve block to move upward for a long distance under the lifting effect of the piston rod and the self-pressure of the oil circuit when the pressure is high, so that part of the medium in the oil circuit enters the first pressure relief chamber, which is equivalent to expanding the width of the oil circuit at that location, thereby reducing the pressure generated by the medium in this section, and playing the role of automatic pressure reduction and pressure balance; In this way, the high-pressure hydraulic valve can autonomously reduce the pressure at a relatively 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. BRIEF DESCRIPTION OF THE DRAWINGS

[0017] Figure 1 This is a schematic structural diagram of the first implementation mode of the present application; Figure 2 This is a structural schematic diagram of the second implementation mode of the present application; Figure 3 This is a structural schematic diagram of the third implementation mode of the present application; Figure 4 This is a structural schematic diagram of the fourth implementation mode of the present application; Figure 5 for Figure 4 A magnified view of the structure at center; Figure 6 This is a structural schematic diagram of the fifth implementation mode of the present application; Figure 7 It is a schematic diagram of the flow direction of the oil pressure medium (dashed arrow, the same below) and the moving direction of the hardware structure (solid arrow, the same below) of the first embodiment of the present application; 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 the present application; Fig. 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 the present application; Fig.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 the present application; Fig.11 This is a schematic diagram of the flow direction of the oil pressure medium and the movement direction of the hardware structure in the fifth embodiment of the present application.

[0018] Description of the numbers in the figure: 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. Vortex chamber; 182. Balanced pressure transition zone; 2. Piston rod; 3. Valve block; 4. Intermediate slide plate; 5. Compression spring. DETAILED DESCRIPTION

[0019] The following is a detailed description of five implementation methods of the present application in conjunction with the accompanying drawings.

[0020] The first implementation method: The present invention provides a high pressure hydraulic valve, see Figure 1 and Figure 7, comprising a valve body 1, with an oil inlet 11 and an oil outlet 12 respectively provided at both ends of the valve body 1, a pressure oil circuit 13 and an oil pressure chamber 14 connected with one end of the pressure oil circuit 13 provided in the valve body 1, the other end of the pressure oil circuit 13 being connected with the lower end of the opening of the oil inlet 11, a piston rod 2 being slidably connected in the oil pressure chamber 14, the upper end of the piston rod 2 slidingly passing through the valve body 1 and extending to the lower end of the connection between the oil inlet 11 and the oil outlet 12, a valve block 3 being slidably provided at the connection between the oil inlet 11 and the oil outlet 12, the piston rod 2 being located at the lower end of the valve block 3 and used for driving the valve block 3 to rise; 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 in the installation cavity; An intermediate slide plate 4 is also slidably connected in the installation cavity. The intermediate slide plate 4 is located at the upper end of the valve block 3. The valve block 3 and the intermediate slide plate 4 as well as the intermediate slide plate 4 and the top wall of the installation cavity are elastically connected via a compression spring 5. The maximum stroke of the piston rod 2 is less than the height of the installation cavity, and the maximum stroke of the valve block 3 is less than half of the height of the installation cavity; An annular first pressure relief chamber 15 is provided on the inner wall of the installation chamber. The first pressure relief chamber 15 is located near the opening at the lower end of the installation chamber and is not connected with the opening of the installation chamber. When the valve block 3 rises to the highest point, the horizontal height of the lower end is higher than the horizontal height of the bottom wall of the first pressure relief chamber 15.

[0021] Based on the above structure, two compression springs 5 ​​are used to share the pressure on the balancing valve block 3, so that the valve block 3 can perform a smooth telescopic 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 balancing valve block 3 can work normally when one of the compression springs 5 ​​is damaged. At the same time, the first pressure relief chamber 15 is set so that when the pressure is high, after the valve block 3 moves upward for a long distance under the lifting effect of the piston rod 2 and the self-pressure of the oil circuit, the first pressure relief chamber 15 is connected with the oil circuit, so that part of the medium in the oil circuit enters the first pressure relief chamber 15, which is equivalent to expanding the width of the oil circuit at this point, thereby reducing the pressure generated by the medium in this section, playing the role of automatic pressure reduction and pressure balance; In this way, the high-pressure hydraulic valve can autonomously reduce the pressure at a relatively high pressure (near load / maximum pressure or full load), thereby reducing the probability of damage to the valve body 1 and the valve block 3 and extending the service life of the high-pressure hydraulic valve.

[0022] Second implementation method: Figure 2 and Figure 8A high-pressure hydraulic valve is shown, which is different from Example 1 in that a second pressure relief chamber 16 is opened on the inner wall of the installation chamber, and the second pressure relief chamber 16 is located at the lower end of the installation chamber and above the first pressure relief chamber 15. When the valve block 3 rises to the highest point, the horizontal height of the lower end is higher than the horizontal height of the bottom wall of the second pressure relief chamber 16.

[0023] By setting the second pressure relief chamber 16, when the pressure is higher than the pressure described in Example 1, the valve block 3 can continue to rise, so that 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 this location, performing secondary pressure reduction, and having 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.

[0024] The third implementation method: Figure 3 and Fig. 9 A high-pressure hydraulic valve is shown, which is different from Example 1 or Example 2 in that an annular third pressure relief chamber 17 is opened on the inner wall of the oil pressure chamber 14, and when the piston rod 2 is in the initial position, the bottom horizontal height of the piston rod 2 is lower than the horizontal height of the bottom wall of the third pressure relief chamber 17, and when the piston rod 2 is at the highest point, the bottom horizontal height of the piston rod 2 is higher than the horizontal height of the bottom wall of the third pressure relief chamber 17; 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.

[0025] By setting the third pressure relief chamber 17, after the piston rod 2 is affected by the medium pressure in the pressure oil circuit 13 and rises, if the plug portion of the piston rod 2 (the portion whose horizontal width is consistent with the oil pressure chamber 14 as 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 reducing the pressure of the piston rod 2 and the oil pressure chamber 14, thereby avoiding fatigue damage to the oil pressure chamber 14 and the piston rod 2 due to the high pressure, which is also conducive to extending the service life of the high-pressure hydraulic valve; In this embodiment, the third pressure relief chamber 17 is arranged in the upper half of the oil pressure chamber 14 and close to the top wall of the oil pressure chamber 14. When the piston rod 2 rises to the maximum height, that is, when the oil pressure chamber 14 is filled with the medium, pressure reduction protection can be performed, thereby reducing the oil pressure close to the maximum pressure limit or slightly exceeding the pressure limit, thereby playing a critical point protection role.

[0026] The fourth implementation method: Figure 4 and Fig.10A high-pressure hydraulic valve is shown, which is different from embodiments 1-3 in that a pressure relief oil circuit 18 connected to the oil outlet 12 is opened on one side of the inner wall of the installation cavity near the opening of the oil outlet 12, and the opening of the pressure relief oil circuit 18 connected to the installation 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 circuit 18.

[0027] By setting the pressure relief oil circuit 18, the medium that enters the installation cavity and penetrates deep (higher than the first pressure relief cavity 15) can be guided to the cavity of the oil outlet 12 through the pressure relief oil circuit 18, so as to achieve the purpose of balancing the pressure there and in the oil outlet 12, thereby alleviating the pressure in the installation cavity, balancing the pressure in the middle part and the port part of the high-pressure hydraulic valve, and also conducive to providing good protection for the high-pressure hydraulic valve.

[0028] Figure 4 It is shown that the cross-section of the pressure relief oil circuit 18 is in a "¬" shape, and the inner diameter of the pressure relief oil circuit 18 gradually increases from one end close to the installation cavity to the end connected to the oil outlet 12, which can gradually reduce the pressure generated by the medium entering the pressure relief oil circuit 18, thereby performing pressure reduction protection on the pressure relief oil circuit 18 and the connecting part between the oil outlet 12 and the pressure relief oil circuit 18, thereby avoiding the phenomenon that the pressure relief oil circuit 18 itself is damaged and causes damage to the high-pressure hydraulic valve.

[0029] Figure 5 It is shown that a vortex chamber 181 is formed on the outside of the bend of the pressure relief oil circuit 18. The cross-section of the vortex chamber 181 is semicircular. The diameter of the vortex chamber 181 is larger than the diameter of the pressure relief oil circuit 18 at that location. Through the setting of the vortex chamber 181, the medium entering the vortex chamber 181 is in a vortex state and turns smoothly, thereby avoiding a large load on the bend of the pressure relief oil circuit 18 and protecting the bend of the pressure relief oil circuit 18.

[0030] Figure 5 It is shown that an arc-shaped equalizing pressure transition zone 182 is formed at the lower end of the vortex chamber 181, and the equalizing pressure transition zone 182 protrudes into the pressure relief oil circuit 18. The equalizing pressure transition zone 182, the vortex chamber 181, and the overall cross-section of the pressure relief oil circuit 18 at this location form an "R"-shaped cavity. The equalizing pressure transition zone 182 can balance the pressure of the vortex chamber 181 and the pipeline section from the pressure relief oil circuit 18 to the oil outlet 12, thereby cooperating with the vortex chamber 181 to achieve a better effect of balancing and reducing pressure.

[0031] The fifth implementation method: Figure 6 and Fig.11 A high-pressure hydraulic valve is shown, which is based on Example 3. The only difference between it and Example 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 portion of the piston rod 2.

[0032] In this embodiment, the third pressure relief chamber 17 is arranged in the lower half of the oil pressure chamber 14 and close to the upper end of the plug of the piston rod 2, so that the oil pressure chamber 14 can be depressurized after the piston rod 2 rises a short distance, so that the oil pressure chamber 14 can withstand a larger pressure. Compared with the third embodiment, it can improve the bearing pressure. It should be noted that this embodiment and embodiment 3 can be used separately or in combination according to needs to achieve better pressure bearing and protection effects.

[0033] In view of current practical needs, the above-mentioned implementation mode adopted in this application is not limited to the scope of protection. Various changes made within the knowledge scope of technical personnel in this field without departing from the concept of this application still fall within the scope of protection of the present invention.

Claims

1. A high-pressure hydraulic valve, comprising a valve body (1), wherein the valve body (1) is provided with an oil inlet (11) and an oil outlet (12) at both ends thereof, wherein a pressure oil circuit (13) and an oil pressure chamber (14) connected to one end of the pressure oil circuit (13) are also provided in the valve body (1), wherein the other end of the pressure oil circuit (13) is connected to the lower end of the opening of the oil inlet (11), wherein a piston rod (2) is slidably connected in the oil pressure chamber (14), wherein 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), wherein a valve block (3) is slidably provided at the connection between the oil inlet (11) and the oil outlet (12), wherein 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, and wherein: An installation cavity is provided at the upper end of the connection point between the oil inlet (11) and the oil outlet (12), and the upper end of the valve block (3) is slidably connected in the installation cavity; An intermediate slide plate (4) is also slidably connected in the installation cavity, and the intermediate slide plate (4) is located at the upper end of the valve block (3). The valve block (3) and the intermediate slide plate (4) as well as the intermediate slide plate (4) and the top wall of the installation cavity are elastically connected via compression springs (5); The maximum stroke of the piston rod (2) is less than the height of the installation cavity, and the maximum stroke of the valve block (3) is less than half the height of the installation cavity; The inner wall of the installation cavity is provided with an annular first pressure relief cavity (15), the first pressure relief cavity (15) being located near the opening at the lower end of the installation cavity and not connected to the opening of the installation cavity, and the horizontal height of the lower end of the valve block (3) being higher than the horizontal height of the bottom wall of the first pressure relief cavity (15) when the valve block (3) is raised to the highest point.

2. A high pressure hydraulic valve according to claim 1, characterized in that: A second pressure relief chamber (16) is provided on the inner wall of the installation chamber. The second pressure relief chamber (16) is located at the lower end of the installation chamber and above the first pressure relief chamber (15). When the valve block (3) is raised to the highest point, the horizontal height of the lower end is higher than the horizontal height of the bottom wall of the second pressure relief chamber (16).

3. A high pressure hydraulic valve according to claim 2, characterized in that: The inner wall of the oil pressure chamber (14) is provided with an annular third pressure relief chamber (17); when the piston rod (2) is in the initial position, the bottom level of the piston rod (2) is lower than the bottom wall level of the third pressure relief chamber (17); when the piston rod (2) is at the highest position, the bottom level of the piston rod (2) is higher than the bottom wall level of the third pressure relief chamber (17).

4. 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 one side of the inner wall of the installation cavity near the opening of the oil outlet (12); the opening of the pressure relief oil passage (18) communicating with the installation cavity is located above the first pressure relief cavity (15) and below the middle slide plate (4); and 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).

5. A high pressure hydraulic valve according to claim 4, characterized in that: The cross section of the pressure relief oil passage (18) is in the shape of a "¬", and the inner diameter of the pressure relief oil passage (18) gradually increases from an end close to the installation cavity to an end connected to the oil outlet (12).

6. A high pressure hydraulic valve according to claim 5, characterized in that: A vortex chamber (181) is formed outside the bend of the pressure relief oil circuit (18); the cross section of the vortex chamber (181) is semicircular; and the diameter of the vortex chamber (181) is greater than the diameter of the pressure relief oil circuit (18).

7. A high pressure hydraulic valve according to claim 6, characterized in that: An arc-shaped pressure-equalizing transition zone (182) is formed at the lower end of the vortex chamber (181), and the pressure-equalizing transition zone (182) protrudes into the pressure relief oil circuit (18). The pressure-equalizing transition zone (182), the vortex chamber (181), and the pressure relief oil circuit (18) at that location form an "R"-shaped cavity in their entirety.

8. A high pressure hydraulic valve according to claim 3, characterized in that: The third pressure relief chamber (17) is located in the upper half of the oil pressure chamber (14) and is close to the inner top wall of the oil pressure chamber (14).

9. A high pressure hydraulic valve according to claim 3, characterized in that: The third pressure relief chamber (17) is located in the lower half of the oil pressure chamber (14) and is close to the upper end of the plug portion of the piston rod (2).

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