A pilot control valve group with good sealing performance

Abstract

The present invention relates to the technical field of valves, and discloses a pilot control valve group with good sealing performance, which includes a pilot valve core body and a main valve core body. A sealing groove is arranged on the outer side of the pilot valve core body, and a first sealing component for sealing is installed on the outer side of the sealing groove of the pilot valve core body. A sealing groove is arranged on the outer side of the main valve core body, and a second sealing component for sealing is installed on the outer side of the sealing groove of the main valve core body. When the pilot valve core body and the main valve core body move, the hydraulic oil squeezes the outer sides of the first sealing component and the second sealing component to deform and offset the stress, and when the pilot valve core body and the main valve core body are stationary, the first sealing component and the second sealing component reset respectively.

Description

Technical Field

[0001] The present invention relates to the technical field of valves, and particularly to a pilot control valve group with good sealing performance. Background Art

[0002] A pilot control valve group is a valve group that controls the action of a main valve through a pilot valve. When the pilot valve receives a control signal, the pilot valve will act and generate a certain control pressure or flow rate. This control pressure or flow rate then pushes the spool of the main valve to change direction or adjust, thereby realizing the control of parameters such as the flow direction, flow rate, and pressure of the fluid. As Figure 1 shown, the main body part of the pilot control valve assembly 100 is the valve body 1001. Inside the valve body 1001, there are a main oil passage and a pilot oil passage: the main oil passage is used to transmit hydraulic oil, and at both ends are an overflow valve 1003 and a pressure reducing overflow valve 1002 respectively; the pilot oil passage is used to transmit the control signal and leads to the solenoid valve 1004.

[0003] Among them, the main spool is installed in the main oil passage inside the valve body. At both ends of it, there are respectively a guide groove and a sealing groove. The guide groove is used to ensure the stability of the spool movement, and the sealing groove is used to install the sealing ring. The pilot spool is installed in the pilot oil passage inside the valve body and is mainly used to control the opening and closing action of the main spool.

[0004] Most of the existing pilot control valve groups use traditional rubber sealing rings for sealing. Although the cost of rubber sealing rings is relatively low, they are prone to deformation under high pressure and have a short service life, and cannot provide a stable sealing effect inside the pilot control valve group.

[0005] Therefore, the present invention provides a pilot control valve group with good sealing performance. Summary of the Invention

[0006] In order to make up for the deficiencies of the prior art and solve at least one of the technical problems proposed in the background art.

[0007] The present invention provides a pilot control valve group with good sealing performance, including a pilot spool main body and a main spool main body. A sealing groove is arranged on the outer side of the pilot spool main body, and a first sealing component for sealing is installed on the outer side of the sealing groove of the pilot spool main body. A sealing groove is arranged on the outer side of the main spool main body, and a second sealing component for sealing is installed on the outer side of the sealing groove of the main spool main body. When the pilot spool main body and the main spool main body move, the hydraulic oil squeezes the outer sides of the first sealing component and the second sealing component to deform and offset the stress. When the pilot spool main body and the main spool main body are stationary, the first sealing component and the second sealing component reset respectively.

[0008] During the deformation process, part of the extrusion force can be offset, avoiding the overall direct extrusion in a high-pressure environment and reducing the deformation probability of the first sealing component and the second sealing component.

[0009] Further, the second sealing assembly includes a sealing outer ring, the sealing outer ring includes a convex ring body, both sides of the convex ring body are fixedly connected with flat ring bodies, a second annular groove is formed inside the convex ring body, and a third annular groove is formed on one side of the flat ring body close to the convex ring body.

[0010] The convex ring body and the flat ring body together fill the gap between the valve body and the main spool body, improving the sealing effect.

[0011] Further, a support bar is arranged through the inside of the second annular groove, and both ends of the support bar are fixedly connected with the side walls of the third annular grooves on both sides.

[0012] Avoid the longitudinal deformation of the sealing outer ring caused by repeatedly moving inside the main oil passage, and improve the longitudinal strength of the sealing outer ring.

[0013] Further, adjusting components are connected to both the inner sides of both sides of the support bar, the adjusting component includes a mounting base, a movable groove is formed on one side of the mounting base away from the support bar, a fixed rod is fixedly connected to one side of the movable groove away from the support bar, the top and bottom of the outside of the fixed rod are rotatably connected with mounting blocks, and an annular retaining strip is fixedly connected to one side of the mounting block away from the support bar.

[0014] Further, a torsion spring is arranged at the connection between the mounting block and the fixed rod.

[0015] Avoid the connection between the convex ring body and the flat ring body from abutting and breaking under the condition of frequent bending, improve the strength of the sealing outer ring, and extend the overall service life of the sealing outer ring.

[0016] Further, the first sealing assembly includes a flat block, movable convex blocks are fixedly connected to both sides of the flat block, and a first annular groove is formed inside the flat block.

[0017] Fully seal the gap between the pilot spool body and the valve body, generate deformation to offset part of the pressure generated by the hydraulic oil, and make the overall strength of the first sealing assembly higher.

[0018] Further, the sealing outer ring is in a Chinese character "zhong" shape, and the heights on both sides of the second annular groove are the same as the height of the third annular groove.

[0019] Further, the center of the annular retaining strip is on the same straight line as the connection between the third annular groove and the second annular groove.

[0020] The beneficial effects of the present invention are as follows:

[0021] 1. A pilot control valve group with good sealing performance according to the present invention. By providing a sealing outer ring, both the inner and outer sides of the convex ring body are relatively more prominent than the inner and outer sides of the flat ring body. When installing the sealing outer ring, the inner side of the convex ring body is extruded by the main spool body, and the outer side of the convex ring body is extruded by the valve body, driving the gas inside the second annular groove towards the third annular groove, causing the flat ring body to expand relatively until the convex ring body and the flat ring body jointly fill the gap between the valve body and the main spool body, improving the sealing effect. During the movement of the main spool body, the position where the sealing outer ring first contacts the hydraulic oil will be extruded and deformed to offset part of the pressure, improving the overall strength. When being extruded, the gas is extruded to other positions and causes the expansion of other positions, so as to fully improve the sealing effect during the movement.

[0022] 2. A pilot control valve group with good sealing performance according to the present invention. By providing support bars, the support bars support the inside of the sealing outer ring, avoiding repeated deformation in the longitudinal direction of the sealing outer ring caused by moving inside the main oil passage, and improving the longitudinal strength of the sealing outer ring.

[0023] 3. A pilot control valve group with good sealing performance according to the present invention. By providing an adjustment component, when the gas does not flow, the torsion spring drives the annular blocking strip to reset to the initial state. The initial state is as shown in the figure. At this time, the annular blocking strip abuts against the connection between the convex ring body and the flat ring body, supporting the connection between the convex ring body and the flat ring body without depression or bending, avoiding fracture at the connection between the convex ring body and the flat ring body due to frequent bending, improving the strength of the sealing outer ring, and extending the overall service life of the sealing outer ring.

[0024] 4. A pilot control valve group with good sealing performance according to the present invention. By providing a first sealing component, the flat block protrudes relative to the movable convex block. After the first sealing component is installed, the top of the flat block is extruded and deformed by the valve body, making the flat block fully seal the gap between the pilot spool body and the valve body. When the pilot spool body moves, the hydraulic oil first contacts the flat block and extrudes the flat block to generate deformation to offset part of the pressure generated by the hydraulic oil, making the overall strength of the first sealing component higher. And a certain volume of gas is stored in a closed state inside the first annular groove. When the flat block is extruded, the volume of the gas inside the first annular groove shrinks to generate a resistance force to counteract part of the extrusion force of the hydraulic oil, thereby further offsetting the pressure. BRIEF DESCRIPTION OF THE DRAWINGS

[0025] Figure 1 is a schematic structural diagram of the pilot control valve assembly in the background art of the present invention;

[0026] Figure 2 is a schematic structural diagram of the pilot spool body in the present invention;

[0027] Figure 3 is a schematic structural diagram of the first sealing component in the present invention;

[0028] Figure 4 is a schematic structural view of the main spool body in the present invention;

[0029] Figure 5 is a schematic structural view of the second sealing assembly in the present invention;

[0030] Figure 6 is a schematic structural view of the outer sealing ring in the present invention;

[0031] Figure 7 is a schematic structural view of the main spool body in the present invention;

[0032] Figure 8 is Figure 7 a partial enlarged view of part A in

[0033] Explanation of reference numerals:

[0034] 100, pilot control valve assembly; 1001, valve body; 1002, pressure reducing and overflow valve; 1003, overflow valve; 1004, solenoid valve;

[0035] 2, pilot spool body; 3, main spool body; 4, first sealing assembly; 401, movable convex block; 402, flat block; 403, first annular groove; 5, second sealing assembly; 501, outer sealing ring; 5011, convex ring body; 5012, second annular groove; 5013, flat ring body; 5014, third annular groove; 502, adjusting assembly; 5021, mounting base; 5022, movable groove; 5023, fixing rod; 5024, mounting block; 5025, annular retaining strip; 503, support strip. Detailed implementation manners

[0036] Now, the subject matter described herein will be discussed with reference to example embodiments. It should be understood that discussing these embodiments is only to enable those skilled in the art to better understand and thus implement the subject matter described herein. Without departing from the scope of protection of the content of this specification, changes can be made to the functions and arrangements of the elements discussed. Each example can omit, substitute, or add various processes or components as needed. Additionally, the features described relative to some examples can also be combined in other examples.

[0037] As Figures 2 to 8 shown, a pilot control valve group with good sealing performance according to an embodiment of the present invention will be mainly referred to Figure 2 、 Figure 4, including a pilot spool body 2 and a main spool body 3. A sealing groove is provided on the outer side of the pilot spool body 2, and a first sealing assembly 4 for sealing is installed outside the sealing groove of the pilot spool body 2. A sealing groove is provided on the outer side of the main spool body 3, and a second sealing assembly 5 for sealing is installed outside the sealing groove of the main spool body 3. When the pilot spool body 2 and the main spool body 3 move, the hydraulic oil squeezes the outer sides of the first sealing assembly 4 and the second sealing assembly 5 to deform and offset the stress. When the pilot spool body 2 and the main spool body 3 are stationary, the first sealing assembly 4 and the second sealing assembly 5 reset respectively.

[0038] Specifically, the middle parts of the first sealing assembly 4 and the second sealing assembly 5 protrude outwards, and both the first sealing assembly 4 and the second sealing assembly 5 are elastic parts. When the hydraulic oil squeezes the first sealing assembly 4 and the second sealing assembly 5 to generate deformation, part of the extrusion force can be offset during the deformation process, avoiding being directly squeezed in a high-pressure environment as a whole, reducing the deformation probability of the first sealing assembly 4 and the second sealing assembly 5, and when the pilot spool body 2 and the main spool body 3 are stationary, the first sealing assembly 4 and the second sealing assembly 5 reset respectively to ensure the normal function of their next work. Since the travel path lengths of the pilot spool body 2 and the main spool body 3 are different from the working purposes, the requirements for the sealing degree are different. The first sealing assembly 4 and the second sealing assembly 5 are respectively installed outside the pilot spool body 2 and the main spool body 3. Among them, the first sealing assembly 4 is a single-layer structure, and the second sealing assembly 5 is a multi-layer structure, which can provide a more suitable sealing effect targeted while saving production costs.

[0039] Please refer specifically to Figure 4 、 Figure 5 、 Figure 6 , the second sealing assembly 5 includes a sealing outer ring 501. The sealing outer ring 501 includes a convex ring body 5011. Two flat ring bodies 5013 are fixedly connected to both sides of the convex ring body 5011. A second annular groove 5012 is opened on the inner side of the convex ring body 5011, and a third annular groove 5014 is opened on the side of the flat ring body 5013 close to the convex ring body 5011.

[0040] Specifically, both the inner side and the outer side of the convex ring body 5011 protrude more relative to the inner and outer sides of the flat ring body 5013. When installing the sealing outer ring 501, the gas inside the second annular groove 5012 is driven towards the third annular groove 5014 under the extrusion of the inner side of the convex ring body 5011 by the main spool body 3 and the extrusion of the outer side of the convex ring body 5011 by the valve body, causing the flat ring body 5013 to expand relatively until the convex ring body 5011 and the flat ring body 5013 jointly fill the gap between the valve body and the main spool body 3, improving the sealing effect;

[0041] When the main spool body 3 moves, the outer sealing ring 501 is in a dynamic balance state. Since the outer sealing ring 501 is an elastic part as a whole, the position in contact with the hydraulic oil first will be squeezed and deformed to offset part of the pressure. When being squeezed, the gas will be squeezed to other positions and cause the expansion of other positions, so as to fully improve the sealing effect during the movement and enhance the overall strength.

[0042] Please refer specifically to Figure 5 , a support bar 503 is arranged through the inner side of the second annular groove 5012, and both ends of the adjusting component 502 are fixedly connected to the side walls of the third annular grooves 5014 on both sides. The length of the support bar 503 is the same as the sum of the lengths of the two third annular grooves 5014 and the length of the second annular groove 5012.

[0043] Specifically, the support bar 503 supports the inside of the outer sealing ring 501, preventing the outer sealing ring 501 from deforming longitudinally due to repeated movement inside the main oil passage, and enhancing the longitudinal strength of the outer sealing ring 501.

[0044] Please refer specifically to Figure 5 , Figure 7 , Figure 8 , adjusting components 502 are connected to both the inner and outer sides of the support bar 503. The adjusting component 502 includes an installation base 5021. An activity groove 5022 is opened on the side of the installation base 5021 away from the support bar 503. A fixed rod 5023 is fixedly connected to the side of the activity groove 5022 away from the support bar 503. The top and bottom of the outer side of the fixed rod 5023 are rotatably connected with installation blocks 5024. An annular retaining strip 5025 is fixedly connected to the side of the installation block 5024 away from the support bar 503. The width of the activity groove 5022 is greater than the width of the annular retaining strip 5025.

[0045] Please refer specifically to Figure 6 , the outer sealing ring 501 is in a Chinese character "zhong" shape, and the heights on both sides of the second annular groove 5012 are the same as the height of the third annular groove 5014.

[0046] Please refer specifically to Figure 5 , the center of the annular retaining strip 5025 and the connection part of the third annular groove 5014 and the second annular groove 5012 are on the same straight line.

[0047] Specifically, the volume of the gas stored inside the second annular groove 5012 is larger and the deformable range of the convex ring body 5011 is larger.

[0048] Further, a torsion spring is provided at the connection between the mounting block 5024 and the fixing rod 5023. An activity hole is formed on one side of the mounting block 5024. The mounting block 5024 is rotationally connected to the outside of the fixing rod 5023 through the activity hole on the mounting block 5024. One end of the torsion spring is fixedly connected to the inner side of the activity hole on the mounting block 5024, and the other end of the torsion spring is fixedly connected to the outside of the fixing rod 5023.

[0049] Specifically, during the process of the gas discharging to both sides in the convex ring body 5011 causing the straight ring body 5013 to expand, when moving to the connection between the convex ring body 5011 and the straight ring body 5013, since there is still forward movement space, the gas will continue to move to the side wall of the straight ring body 5013 and then expand again. Therefore, bending may occur at the connection between the convex ring body 5011 and the straight ring body 5013.

[0050] Adjusting components 502 are arranged on the inner and outer sides of the adjusting component 502 at the connection between the convex ring body 5011 and the straight ring body 5013. One side of the mounting base 5021 away from the fixing rod 5023 is fixedly connected to the support bar 503, and one side of the annular blocking strip 5025 away from the fixing rod 5023 abuts against the connection between the convex ring body 5011 and the straight ring body 5013. When the gas does not flow, the torsion spring drives the annular blocking strip 5025 to reset to the initial state. The initial state is as Figure 8 shown. At this time, the annular blocking strip 5025 abuts against the connection between the convex ring body 5011 and the straight ring body 5013, and there is no depression or bending at the connection with the convex ring body 5011 and the straight ring body 5013, avoiding breakage at the connection between the convex ring body 5011 and the straight ring body 5013 due to frequent bending, which affects the overall service life of the sealing outer ring 501. When the hydraulic oil moves or changes to a stationary state, due to the change in the pressure state of the sealing outer ring 501, deformation will occur at the corresponding pressure-bearing position, resulting in the movement of the gas in the third annular groove 5014 and the second annular groove 5012. During the movement of the gas, the annular blocking strip 5025 is pushed to flip a certain angle in the direction of the gas movement, so that a gap is exposed at the connection between the third annular groove 5014 and the second annular groove 5012 to ensure the normal movement of the gas.

[0051] Please refer specifically to Figure 3 , the first sealing component 4 includes a straight block 402. Activity bumps 401 are fixedly connected to both sides of the straight block 402. A first annular groove 403 is formed on the inner side of the straight block 402. The inner side of the activity bump 401 is closely attached to the outer side of the sealing groove of the pilot valve core body 2.

[0052] Specifically, the flat block 402 protrudes relative to the movable convex block 401. After the flat block 402 is installed, the topmost part is deformed by the extrusion of the valve body and fully seals the gap between the pilot valve core body 2 and the valve body. When the pilot valve core body 2 moves, the hydraulic oil preferentially contacts the flat block 402 and extrudes the flat block 402 to generate deformation to offset part of the pressure generated by the hydraulic oil, making the overall strength of the first sealing assembly 4 higher. And a certain volume of gas is stored and sealed inside the first annular groove 403. When the flat block 402 is extruded, the volume of the gas inside the first annular groove 403 shrinks to generate a resistance force to counteract part of the extrusion force of the hydraulic oil, thereby further offsetting the pressure. When the pilot valve core body 2 is stationary, the flat block 402 resets due to its own elastic potential energy, and the gas inside the first annular groove 403 diffuses to the initial state again.

[0053] Working principle

[0054] When the pilot valve core body 2 moves, the hydraulic oil preferentially contacts the flat block 402 and extrudes the flat block 402 to generate deformation to offset part of the pressure generated by the hydraulic oil. Since a certain volume of gas is stored inside the first annular groove 403 and the movable convex block 401 is also subjected to an extrusion force to seal both sides of the first annular groove 403, when the flat block 402 is extruded, the volume of the gas inside the first annular groove 403 shrinks to generate a resistance force to counteract part of the extrusion force of the hydraulic oil, thereby further offsetting the pressure.

[0055] When the main valve core body 3 moves, the outer sealing ring 501 is in a dynamic equilibrium state. Since the outer sealing ring 501 is an elastic part as a whole, the position where the outer sealing ring 501 preferentially contacts the hydraulic oil will be extruded and deformed to offset part of the pressure. When being extruded, the gas is extruded to other positions and causes the expansion of other positions. And during the movement of the gas, it can push the annular blocking strip 5025 to flip a certain angle to ensure its normal movement, so as to fully improve the sealing effect during the movement. When the gas does not flow, the torsion spring drives the annular blocking strip 5025 to reset to the initial state. The initial state is as Figure 8 shown. At this time, the annular blocking strip 5025 abuts against the connection between the convex ring body 5011 and the flat ring body 5013, and there is no depression or bending at the connection between the convex ring body 5011 and the flat ring body 5013.

[0056] The above describes the embodiments of the specific implementation manner, but this embodiment is not limited to the above specific implementation manner. The above specific implementation manner is only illustrative and not restrictive. Under the inspiration of this embodiment, those of ordinary skill in the art can also make many forms, all of which fall within the protection scope of this embodiment.

Claims

1. A pilot control valve assembly with good sealing performance, comprising a pilot valve core body (2) and a main valve core body (3), characterized in that: A sealing groove is provided on the outer side of the pilot spool valve body (2), and a first sealing assembly (4) for sealing is installed on the outer side of the sealing groove of the pilot spool valve body (2). A sealing groove is provided on the outer side of the main spool valve body (3), and a second sealing assembly (5) for sealing is installed on the outer side of the sealing groove of the main spool valve body (3). When the pilot spool valve body (2) and the main spool valve body (3) move, the hydraulic oil squeezes the outer sides of the first sealing assembly (4) and the second sealing assembly (5) to deform and offset the stress. When the pilot spool valve body (2) and the main spool valve body (3) are stationary, the first sealing assembly (4) and the second sealing assembly (5) are reset respectively; The second sealing assembly (5) includes a sealing outer ring (501), the sealing outer ring (501) includes a convex ring body (5011), flat ring bodies (5013) are fixedly connected to both sides of the convex ring body (5011), a second annular groove (5012) is formed inside the convex ring body (5011), and a third annular groove (5014) is formed on the side of the flat ring body (5013) close to the convex ring body (5011); A support bar (503) is arranged through the inside of the second annular groove (5012), and both ends of the support bar (503) are fixedly connected to the side walls of the third annular grooves (5014) on both sides; Adjusting components (502) are connected to both the inner and outer sides of both sides of the support bar (503). The adjusting component (502) includes a mounting base (5021), a movable groove (5022) is formed on the side of the mounting base (5021) away from the support bar (503), a fixed rod (5023) is fixedly connected to the side of the movable groove (5022) away from the support bar (503), mounting blocks (5024) are rotatably connected to the top and bottom of the outer side of the fixed rod (5023), and an annular retaining strip (5025) is fixedly connected to the side of the mounting block (5024) away from the support bar (503); A torsion spring is arranged at the connection between the mounting block (5024) and the fixed rod (5023).

2. A pilot control valve group with good sealing performance according to claim 1, characterized in that: The first sealing assembly (4) includes a flat block (402), movable convex blocks (401) are fixedly connected to both sides of the flat block (402), and a first annular groove (403) is formed inside the flat block (402).

3. A pilot control valve group with good sealing performance according to claim 1, characterized in that: The second annular groove (5012) is in the shape of a Chinese character 'zhong', and the heights of both sides of the second annular groove (5012) are the same as the height of the third annular groove (5014).

4. A pilot control valve group with good sealing performance according to claim 3, characterized in that: The center of the annular retaining strip (5025) and the connection of the third annular groove (5014) and the second annular groove (5012) are on the same straight line.

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