Pilot control valve group with good sealing performance

Abstract

The invention relates to the technical field of valves, and discloses a pilot control valve group with good sealing performance, which comprises a pilot valve core main body and a main valve core main body, the outer side of the pilot valve core main body is provided with a sealing groove, the outer side of the sealing groove of the pilot valve core main body is provided with a first sealing assembly for sealing, and the outer side of the main valve core main body is provided with a sealing groove. A second sealing assembly used for sealing is installed on the outer side of a sealing groove of the main valve element body, and when the pilot valve element body and the main valve element body move, hydraulic oil extrudes the outer side of the first sealing assembly and the outer side of the second sealing assembly to deform to offset stress. And when the pilot valve element main body and the main valve element main body are static, the first sealing assembly and the second sealing assembly are respectively reset.

Description

Technical Field

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

[0002] The pilot control valve group is a valve group that controls the action of the main valve through the pilot valve. When the pilot valve receives the control signal, the pilot valve will act and generate a certain control pressure or flow. This control pressure or flow will then push the valve core of the main valve to change direction or adjust, thereby achieving control of fluid flow direction, flow, pressure and other parameters, such as Figure 1 As shown, the main part of the pilot control valve assembly 100 is the valve body 1001, and the valve body 1001 is provided with a main oil channel and a pilot oil channel: the main oil channel is used to transmit hydraulic oil, and the two ends are respectively a relief valve 1003 and a pressure reducing relief valve 1002; the pilot oil channel is used to transmit the control signal and leads to the solenoid valve 1004.

[0003] The main valve core is installed in the main oil channel in the valve body, and a guide groove and a sealing groove are provided at both ends. The guide groove is used to ensure the stability of the valve core movement, and the sealing groove is used to install the sealing ring. The pilot valve core is installed in the pilot oil channel in the valve body, and is mainly used to control the switching action of the main valve core.

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

[0005] To this end, 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, at least one technical problem raised in the background technology is solved.

[0007] The present invention provides a pilot control valve group with good sealing performance, including 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, 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, 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, hydraulic oil squeezes the outer sides of the first sealing component and the second sealing component to cause deformation to offset 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 are reset respectively.

[0008] During the deformation process, part of the extrusion force can be offset to prevent the entire assembly from being directly extruded in a high-pressure environment, thereby reducing the probability of deformation of the first sealing assembly and the second sealing assembly.

[0009] Furthermore, 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 straight 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 straight ring body close to the convex ring body.

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

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

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

[0013] Furthermore, adjusting components are connected to both the inner sides of both sides of the support bar. The adjusting component includes a mounting base. An activity groove is formed on one side of the mounting base away from the support bar. A fixing rod is fixedly connected to one side of the activity groove away from the support bar. The top and bottom of the outer side of the fixing rod are rotatably connected with mounting blocks. An annular retaining strip is fixedly connected to one side of the mounting block away from the support bar.

[0014] Furthermore, a torsion spring is disposed at the connection between the mounting block and the fixing rod.

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

[0016] Furthermore, the first sealing assembly includes a flat block, both sides of the flat block are fixedly connected with movable convex blocks, 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 a part of the pressure generated by the hydraulic oil, and make the overall strength of the first sealing assembly higher.

[0018] Furthermore, 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] Furthermore, the center of the annular retaining strip, the connection of the third annular groove and the second annular groove are located on the same straight line.

[0020] The beneficial effects of the present invention are as follows: 1. The pilot control valve group with good sealing performance described in the present invention is characterized in that the inner and outer sides of the convex ring body are relatively more prominent relative to the inner and outer sides of the straight ring body by setting a sealing outer ring. When the sealing outer ring is installed, the inner side of the convex ring body is squeezed by the main valve core body and the outer side of the convex ring body is squeezed by the valve body, so that the gas inside the second annular groove is driven toward the third annular groove, causing the straight ring body to expand relatively until the convex ring body and the straight ring body jointly fill the gap between the valve body and the main valve core body, thereby improving the sealing effect. During the movement of the main valve core body, the position where the sealing outer ring preferentially contacts the hydraulic oil will be squeezed and deformed and offset part of the pressure, thereby improving the overall strength. When squeezed, the gas will be squeezed to other positions and cause expansion of other positions, thereby fully improving the sealing effect during the movement.

[0021] 2. The pilot control valve group with good sealing performance described in the present invention is equipped with support bars, which support the inside of the sealing outer ring to avoid longitudinal deformation of the sealing outer ring caused by repeated movement inside the main oil channel, thereby improving the longitudinal strength of the sealing outer ring.

[0022] 3. The pilot control valve group with good sealing performance described in the present invention is provided with an adjustment component. When the gas does not flow, the torsion spring drives the annular baffle to reset to the initial state. The initial state is shown in the figure. At this time, the annular baffle abuts against the connection between the convex ring body and the straight ring body, and the connection between the support and the convex ring body and the straight ring body does not sink or bend, thereby avoiding the fracture of the connection between the convex ring body and the straight ring body due to frequent bending, thereby improving the strength of the sealing outer ring and extending the overall service life of the sealing outer ring.

[0023] 4. The pilot control valve group with good sealing performance described in the present invention is provided with a first sealing component, and the straight block protrudes relative to the movable protrusion. After the first sealing component is installed, the top of the straight block is squeezed and deformed by the valve body so that the straight block can fully seal the gap between the pilot valve core body and the valve body. When the pilot valve core body moves, the hydraulic oil preferentially contacts the straight block and squeezes the straight block to produce deformation to offset a part of the pressure generated by the hydraulic oil, so that the overall strength of the first sealing component is higher, and a certain volume of gas is sealed and stored inside the first annular groove. When the straight block is squeezed, the volume of the gas inside the first annular groove is reduced to generate resistance to counteract the squeezing force of part of the hydraulic oil, thereby further offsetting the pressure. BRIEF DESCRIPTION OF THE DRAWINGS

[0024] Figure 1 It is a structural schematic diagram of a pilot control valve assembly in the background technology of the present invention; Figure 2 It is a structural schematic diagram of the pilot valve core body in the present invention; Figure 3 It is a structural schematic diagram of the first sealing component in the present invention; Figure 4It is a structural schematic diagram of the main valve core body in the present invention; Figure 5 is a schematic structural diagram of the second sealing component in the present invention; Figure 6 It is a schematic diagram of the structure of the sealing outer ring in the present invention; Figure 7 It is a structural schematic diagram of the main valve core body in the present invention; Figure 8 yes Figure 7 A partial enlarged view of point A in the middle.

[0025] Description of reference numerals: 100, pilot control valve assembly; 1001, valve body; 1002, pressure reducing relief valve; 1003, relief valve; 1004, solenoid valve; 2. Pilot valve core body; 3. Main valve core body; 4. First sealing assembly; 401. Movable convex block; 402. Straight block; 403. First annular groove; 5. Second sealing assembly; 501. Sealing outer ring; 5011. Convex ring body; 5012. Second annular groove; 5013. Straight ring body; 5014. Third annular groove; 502. Adjusting assembly; 5021. Mounting base; 5022. Movable groove; 5023. Fixed rod; 5024. Mounting block; 5025. Annular retaining strip; 503. Support strip. DETAILED DESCRIPTION

[0026] The subject matter described herein will now be discussed with reference to example embodiments. It should be understood that the discussion of these embodiments is only to enable those skilled in the art to better understand and implement the subject matter described herein, and the functions and arrangements of the elements discussed may be changed without departing from the scope of protection of the contents of this specification. Each example may omit, replace or add various processes or components as needed. In addition, the features described relative to some examples may also be combined in other examples.

[0027] like Figures 2 to 8 As shown, a pilot control valve group with good sealing performance according to an embodiment of the present invention is shown in FIG. Figure 2 , Figure 4 , including a pilot valve core body 2 and a main valve core body 3, a sealing groove is provided on the outer side of the pilot valve core body 2, a first sealing component 4 for sealing is installed on the outer side of the sealing groove of the pilot valve core body 2, a sealing groove is provided on the outer side of the main valve core body 3, a second sealing component 5 for sealing is installed on the outer side of the sealing groove of the main valve core body 3, when the pilot valve core body 2 and the main valve core body 3 move, the hydraulic oil squeezes the outer sides of the first sealing component 4 and the second sealing component 5 to cause deformation to offset the stress, and when the pilot valve core body 2 and the main valve core body 3 are stationary, the first sealing component 4 and the second sealing component 5 are reset respectively.

[0028] Specifically, the middle parts of the first sealing component 4 and the second sealing component 5 protrude outward and the first sealing component 4 and the second sealing component 5 are both elastic parts. When the hydraulic oil squeezes the first sealing component 4 and the second sealing component 5 to cause deformation, part of the squeezing force can be offset during the deformation process to avoid the whole being directly squeezed in a high-pressure environment, thereby reducing the deformation probability of the first sealing component 4 and the second sealing component 5. When the pilot valve core body 2 and the main valve core body 3 are stationary, the first sealing component 4 and the second sealing component 5 are reset respectively to ensure their normal functions for the next operation. Since the travel path lengths and working purposes of the pilot valve core body 2 and the main valve core body 3 are different, the requirements for the degree of sealing are different. The first sealing component 4 and the second sealing component 5 are respectively arranged and installed on the outside of the pilot valve core body 2 and the main valve core body 3, wherein the first sealing component 4 is a single-layer structure and the second sealing component 5 is a multi-layer structure, which saves production costs while providing a more suitable sealing effect in a targeted manner.

[0029] Please refer to Figure 4 , Figure 5 , Figure 6 The second sealing assembly 5 includes a sealing outer ring 501, and the sealing outer ring 501 includes a convex ring body 5011. The two sides of the convex ring body 5011 are fixedly connected with a straight ring body 5013. The inner side of the convex ring body 5011 is provided with a second annular groove 5012, and the side of the straight ring body 5013 close to the convex ring body 5011 is provided with a third annular groove 5014.

[0030] Specifically, the inner and outer sides of the convex ring body 5011 are relatively protruding relative to the inner and outer sides of the straight ring body 5013. When the sealing outer ring 501 is installed, the inner side of the convex ring body 5011 is squeezed by the main valve core body 3, and the outer side of the convex ring body 5011 is squeezed by the valve body, so that the gas inside the second annular groove 5012 is driven toward the third annular groove 5014, causing the straight ring body 5013 to expand relatively until the convex ring body 5011 and the straight ring body 5013 jointly fill the gap between the valve body and the main valve core body 3, thereby improving the sealing effect. When the main valve core body 3 moves, the sealing outer ring 501 is in a dynamic equilibrium state. Since the sealing outer ring 501 is an elastic part as a whole, the position that preferentially contacts the hydraulic oil will be squeezed and deformed and offset part of the pressure. When squeezed, the gas will be squeezed to other positions and cause expansion of other positions, so as to fully improve the sealing effect during the movement process and improve the overall strength.

[0031] Please refer to Figure 5 A support bar 503 is provided on the inner side of the second annular groove 5012, and the two ends of the adjustment 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 length of the two third annular grooves 5014 and the length of the second annular groove 5012.

[0032] Specifically, the support bar 503 supports the inside of the sealing outer ring 501, preventing the sealing outer ring 501 from being deformed longitudinally due to repeated movement inside the main oil passage, and improving the longitudinal strength of the sealing outer ring 501.

[0033] Please refer specifically to Figure 5 、 Figure 7 、 Figure 8 , adjustment components 502 are connected to both the inner and outer sides of the support bar 503. The adjustment component 502 includes a mounting base 5021. An activity slot 5022 is provided 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 activity slot 5022 away from the support bar 503. The top and bottom of the outer side of the fixed rod 5023 are rotatably connected to a mounting block 5024. A ring-shaped stop bar 5025 is fixedly connected to the side of the mounting block 5024 away from the support bar 503. The width of the activity slot 5022 is greater than the width of the ring-shaped stop bar 5025.

[0034] Please refer specifically to Figure 6 , the sealing outer ring 501 is in the shape of a Chinese character 'zhong'. The heights on both sides of the second annular groove 5012 are the same as the height of the third annular groove 5014.

[0035] Please refer specifically to Figure 5 , the center of the ring-shaped stop bar 5025 and the connection between the third annular groove 5014 and the second annular groove 5012 are on the same straight line.

[0036] Specifically, the inner side of the second annular groove 5012 stores a larger volume of gas and the deformable range of the convex ring body 5011 is larger.

[0037] Furthermore, a torsion spring is provided at the connection between the mounting block 5024 and the fixed rod 5023. An activity hole is provided on one side of the mounting block 5024. The mounting block 5024 is rotatably connected to the outer side of the fixed 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 outer side of the fixed rod 5023.

[0038] Specifically, during the process of the gas in the convex ring body 5011 discharging to both sides and causing the flat ring body 5013 to expand, when moving to the connection between the convex ring body 5011 and the flat ring body 5013, since there is still forward movement space, the gas will continue to move to the side wall of the flat ring body 5013 and then expand. Therefore, bending may occur at the connection between the convex ring body 5011 and the flat ring body 5013; An adjusting assembly 502 is arranged inside and outside the adjusting assembly 502 at the connection between the convex ring body 5011 and the straight ring body 5013. The side of the mounting base 5021 away from the fixing rod 5023 is fixedly connected to the support bar 503, and the side of the annular retaining bar 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 retaining bar 5025 to return to the initial state. The initial state is as shown in FIG. Figure 8 As shown, at this time, the annular retaining strip 5025 abuts against the connection between the convex ring body 5011 and the straight ring body 5013, and does not sink or bend when abutting against the connection between the convex ring body 5011 and the straight ring body 5013, thereby avoiding the rupture of the connection between the convex ring body 5011 and the straight ring body 5013 when the connection is frequently in a bent state, which affects the overall service life of the sealing outer ring 501. When the hydraulic oil moves or changes to a static state, the sealing outer ring 501 will be deformed at the corresponding compressed position due to the change in the pressure state, causing the gas to move in the third annular groove 5014 and the second annular groove 5012. During the movement of the gas, the annular retaining strip 5025 is pushed to flip a certain angle toward the direction of 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 normal movement of the gas.

[0039] Please refer to Figure 3 The first sealing assembly 4 includes a straight block 402, both sides of which are fixedly connected with movable protrusions 401, the inner side of the straight block 402 is provided with a first annular groove 403, and the inner side of the movable protrusion 401 is tightly fitted with the outer side of the sealing groove of the pilot valve core body 2.

[0040] Specifically, the straight block 402 protrudes relative to the movable protrusion 401. After the straight block 402 is installed, the top portion is squeezed and deformed by 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 straight block 402 and squeezes the straight block 402 to deform to offset a portion of the pressure generated by the hydraulic oil, so that the overall strength of the first sealing component 4 is higher, and a certain volume of gas is sealed and stored inside the first annular groove 403. When the straight block 402 is squeezed, the volume of the gas inside the first annular groove 403 is reduced to generate resistance to counteract the squeezing force of part of the hydraulic oil, thereby further offsetting the pressure. When the pilot valve core body 2 is stationary, the straight block 402 is reset due to its own elastic potential energy, and the gas inside the first annular groove 403 diffuses to the initial state again.

[0041] How it works When the pilot valve core body 2 moves, the hydraulic oil first contacts the straight block 402 and squeezes the straight block 402 to produce 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 protrusion 401 is also squeezed to close both sides of the first annular groove 403, when the straight block 402 is squeezed, the volume of the gas inside the first annular groove 403 is reduced to generate resistance to counteract the squeezing force of part of the hydraulic oil, thereby further offsetting the pressure. When the main valve core body 3 moves, the sealing outer ring 501 is in a dynamic equilibrium state. Since the sealing outer ring 501 is an elastic part as a whole, the position where the sealing outer ring 501 contacts the hydraulic oil first will be squeezed and deformed and offset part of the pressure. When squeezed, the gas will be squeezed to other positions and cause expansion of other positions. In the process of gas movement, the annular retaining bar 5025 can be pushed 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 retaining bar 5025 to reset to the initial state. The initial state is as follows: Figure 8 As shown, at this time, the annular retaining strip 5025 abuts against the connection between the convex ring body 5011 and the straight ring body 5013, and does not sink or bend when abutting against the connection between the convex ring body 5011 and the straight ring body 5013.

[0042] An example of the present specific implementation mode is described above, but the present embodiment is not limited to the above-mentioned specific implementation mode, which is merely illustrative and not restrictive. A person skilled in the art may make many forms inspired by the present embodiment, all of which are protected by the present 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) reset respectively.

2. A pilot control valve group with good sealing performance according to claim 1, characterized in that: The second sealing assembly (5) includes a sealing outer ring (501), and the sealing outer ring (501) includes a convex ring body (5011). Both sides of the convex ring body (5011) are fixedly connected with straight ring bodies (5013). A second annular groove (5012) is formed on the inner side of the convex ring body (5011), and a third annular groove (5014) is formed on the side of the straight ring body (5013) close to the convex ring body (5011).

3. A pilot control valve group with good sealing performance according to claim 2, characterized in that: A support bar (503) is disposed through the inner side 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.

4. A pilot control valve group with good sealing performance according to claim 3, characterized in that: 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). An activity 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 activity groove (5022) away from the support bar (503). The top and bottom of the outer side of the fixed rod (5023) are rotationally connected with mounting blocks (5024), and an annular retaining bar (5025) is fixedly connected to the side of the mounting block (5024) away from the support bar (503).

5. A pilot control valve group with good sealing performance according to claim 4, characterized in that: A torsion spring is provided at the connection between the mounting block (5024) and the fixed rod (5023).

6. A pilot control valve group with good sealing performance according to claim 1, characterized in that: The first sealing assembly (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).

7. A pilot control valve group with good sealing performance according to claim 2, characterized in that: The sealing outer 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).

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

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