A seal arrangement for a hydraulic system

Abstract

The application relates to a sealing structure for a hydraulic system, and relates to the field of hydraulic system sealing technology, which comprises a buffer block arranged in a hole, the buffer block is used for buffering instantaneous pressure impact generated during operation of the hydraulic system, one side of the buffer block close to a screw plug is provided with a pressing block, a through hole is arranged on the buffer block, the pressing block is inserted and abuts in the through hole, the through hole is arranged in communication with the hole, a fixing piece is movably connected in the hole, the fixing piece is located between the pressing block and the screw plug, the fixing piece abuts the pressing block on the buffer block, the pressing block abuts the buffer block in the hole, and a screw groove is arranged on the side, away from the buffer block, of the pressing block. During inspection, the through hole penetrating the hole on the buffer block is directly used for checking the oil circuit, the buffer block does not need to be taken out for checking the oil circuit, the problem that the nylon block is difficult to take out during checking the oil circuit can be solved, and checking the oil circuit is facilitated.

Description

TECHNICAL FIELD

[0001] The present application relates to the field of hydraulic system sealing technology, in particular to a sealing structure for a hydraulic system. BACKGROUND

[0002] Integrated hydraulic system is widely used in modern mechanical equipment, and in its design process, the design of hydraulic integrated block is a key link. In the design of hydraulic integrated block, the focus is on the selection, arrangement of hydraulic components and the design of valve block. The communication of hydraulic component oil circuit is realized inside the valve block, which cannot be directly observed outside, so the correct and reasonable design of the internal oil circuit of the valve block is quite critical. On the valve block, the oil circuit composed of various components needs to be processed according to the circuit diagram. In the processing process, some oil circuits need to be connected by adding holes to connect the holes on different surfaces. The holes connected by the oil circuit are sealed by the combination of the screw plug and the sealing ring.

[0003] At present, in order to improve the problem of leakage caused by instantaneous pressure impact generated by high frequency work of the hydraulic system, the existing hole sealing usually adds a sealing structure in the hole. The sealing structure usually includes a nylon block for buffering the instantaneous pressure impact generated by the hydraulic system and a threaded fixing block. During installation, the worker inserts the nylon block into the hole, puts in the threaded fixing block, tightens the threaded fixing block, and the threaded fixing block tightly presses the nylon block in the hole. At this time, the nylon block is blocked in the hole, and the top surface of the nylon block is deformed to form a sealing surface that fits the inner wall of the hole by being extruded by the threaded fixing block. Then the sealing ring is sleeved on the screw plug, the screw plug is connected with the hole through screw threads, and the sealing ring is abutted on the outer wall of the hole. When it is necessary to check the internal oil circuit of the valve block, the screw plug needs to be loosened first, and then the screw plug and the sealing ring are removed. Then the threaded fixing block is loosened and removed from the hole by using a tool, and then the nylon block is taken out. In this way, the oil circuit can be checked through the hole.

[0004] Since the nylon block is extruded and deformed to block in the hole and fit the inner wall of the hole, when the worker takes out the nylon block, it is necessary to use auxiliary tools to extend into the hole along the edge of the nylon block to loosen the nylon block. When the edges of the nylon block are separated from the hole, the nylon block can be moved out of the hole. This operation process is difficult and inconvenient for checking the oil circuit. SUMMARY

[0005] In order to improve the problem that the nylon block is difficult to take out when checking the oil circuit, the present application provides a sealing structure for a hydraulic system.

[0006] The sealing structure for a hydraulic system provided by the present application adopts the following technical scheme:

[0007] The utility model provides a sealing structure for hydraulic system, including screw plug and sealing ring, the sealing ring is sleeved on the screw plug, the screw plug is used for inserting hole and is connected with the hole screw, the screw plug is sealed on the orifice of hole, still include the buffer block who sets up in the hole, the buffer block is used for buffering the instantaneous pressure impact produced when hydraulic system works, the buffer block is equipped with the pressure block on the side near the screw plug, be equipped with the through -hole on the buffer block, the pressure block inserts and is in the through -hole and is in contact, the through -hole is connected with the hole arrangement, the hole has the movable joint with fixed part, the fixed part is located between the pressure block and the screw plug, the fixed part is tightly pressed on the buffer block with the pressure block, the pressure block is tightly pressed in the hole with the buffer block, the pressure block is equipped with the screw groove on the side away from the buffer block.

[0008] Through the above technical scheme, when installing, the buffer block is put into the plug hole, then the pressure block is put into the plug hole, and the pressure block is inserted into the through hole and in contact with the through hole, then the fixed part is put in, the fixed part is connected with the connecting hole, the pressure block is tightly pressed on the buffer block by the fixed part, the sealing ring is sleeved on the screw plug, the screw plug is connected with the hole by screwing, the screw plug is sealed on the orifice of the hole and the sealing ring is in contact with the outer wall of the hole, that is, two seals are formed, when the hydraulic system works at high frequency, the instantaneous pressure impact generated can be buffered by the buffer block; when checking the internal oil circuit of the valve block is needed, the screw plug needs to be unscrewed, and the screw plug and the sealing ring are removed, since the fixed part is movably connected with the hole, the fixed part can be taken out, then the screwdriver is inserted into the screw groove on the pressure block and rotated, so that the pressure block is separated from the through hole of the buffer block and moved out of the hole, at this time the through hole and the hole are connected, that is, the oil circuit can be directly checked through the connected hole and the through hole, and this process does not need to take out the buffer block to check the oil circuit, so as to improve the problem that the nylon block is difficult to take out when checking the oil circuit, and further facilitate the checking of the oil circuit.

[0009] In a specific embodiment, the hole includes an oil hole, a plug hole, and a connecting hole connected with the screw plug, the plug hole is located between the oil hole and the connecting hole, the buffer block and the pressure block are arranged in the plug hole, and the fixed part is movably connected with the connecting hole; the buffer block includes a sealing part and a plug part in contact with the pressure block, the diameter of the plug hole is larger than that of the oil hole, the sealing part is pressed into the oil hole by the pressure block, and the plug part is clamped on the hole wall of the plug hole near the oil hole.

[0010] By using the above technical scheme, the diameter of the plug hole is larger than that of the oil hole, so that the pressure block can press the sealing part on the buffer block into the oil hole, better fix the sealing part, and deform the sealing part to better realize the sealing function of the sealing block and better play the buffering role.

[0011] In one specific implementation, the sealing portion is in interference fit with the oil hole.

[0012] By adopting the above technical solution, the sealing portion and the oil hole can be better sealed by interference fit of the sealing portion and the oil hole, which is conducive to reducing the possibility of leakage and enhancing the reliability of the seal.

[0013] In one specific implementation, the plug portion is provided with a conical surface on one side surface close to the sealing portion, the plug hole is provided with a funnel-shaped surface on the hole wall surface close to the oil hole, and the conical surface is attached to the funnel-shaped surface.

[0014] By adopting the above technical solution, the plug portion can be fully attached to the plug hole by the attachment of the conical surface and the funnel-shaped surface, so that the buffer block can better play the effect of buffering and sealing, and the compression block can press the sealing portion into the oil hole.

[0015] In one specific implementation, the compression block includes a fitting portion and a clamping portion, the fitting portion passes through the through hole and is in interference fit with the through hole, and the clamping portion is clamped on one side of the plug portion away from the sealing portion.

[0016] By adopting the above technical solution, during installation, the fitting portion is inserted into the through hole, the fitting portion is in interference fit with the through hole, and at this time, the clamping portion is clamped on one side of the plug portion away from the sealing portion, that is, the installation of the buffer block and the plug block is completed. The interference fit of the fitting portion and the through hole enables the buffer block and the through hole to be better sealed, that is, the buffer block and the plug block are sealed, thereby reducing the possibility of leakage and enhancing the reliability of the seal.

[0017] In one specific implementation, the fixing member includes a fixing block, the fixing block is composed of a fixing portion and a connecting portion, the fixing portion is inserted into the plug hole and abuts against the compression block, the connecting portion is provided with threads, and the threads are screw-connected with the connecting hole.

[0018] By adopting the above technical solution, during installation, the fixing block is inserted into the connecting hole, the fixing block is rotated, the threads on the connecting portion are screw-connected with the connecting hole, so that the fixing block and the connecting hole can be detachably connected.

[0019] In one specific implementation, an activity space is left between the fixing portion and the plug hole, and the activity space is used for rotation of the fixing portion.

[0020] By adopting the technical scheme, during installation, the fixed part is inserted into the plug hole, the fixed block is rotated, the threads on the connecting part are threadedly connected with the connecting hole, in this process, the connecting part is rotated, which drives the fixed part to rotate, at this time, the setting of the activity space enables the fixed part to rotate smoothly, thereby facilitating the connection of the fixed block and the connecting hole.

[0021] In a specific implementation, the connecting hole has a larger diameter than the plug hole, and the connecting part is clamped on one side of the connecting hole close to the plug hole.

[0022] By adopting the technical scheme, the connecting hole has a larger diameter than the plug hole, during installation, the connecting part is clamped on one side of the connecting hole close to the plug hole, which can limit the position of the fixed block, so that the fixed block can tightly abut against the buffer block and the plug block while providing sufficient buffer space for the buffer block and the plug block, thereby enabling the sealing block to better play a buffering role.

[0023] In a specific implementation, the fixed block is provided with a tool withdrawal hole, which is used for a worker to disassemble the fixed block.

[0024] By adopting the technical scheme, the setting of the tool withdrawal hole enables the worker to use an auxiliary tool to insert the tool withdrawal hole for rotation when disassembly is needed, so that the fixed block can be separated from the connecting hole, thereby facilitating the disassembly of the fixed block.

[0025] In summary, the present application has at least one of the following beneficial technical effects:

[0026] 1. The sealing structure for a hydraulic system can be used to improve the problem that it is difficult to remove the nylon block when checking the oil way, thereby facilitating the checking of the oil way.

[0027] 2. The sealing structure for a hydraulic system can make the buffer block and the compression block jointly block the oil hole and the plug hole, so that the buffer block and the compression block can directly seal, which is conducive to reducing the possibility of leakage and enhancing the reliability of sealing.

[0028] 3. The sealing structure for hydraulic system of the present application, which utilizes the hole diameter of the connecting hole being larger than that of the plug hole, and in the process of installation, the connecting part is clamped on the side of the connecting hole close to the plug hole, which can limit the position of the fixing block, so that the fixing block can give enough buffer space to the buffer block and the plug block while it can fix the buffer block and the plug block tightly, so that the sealing block can better play the role of buffering. BRIEF DESCRIPTION OF DRAWINGS

[0029] Figure 1 is a structural schematic view of the sealing structure for hydraulic system of the embodiment of the present application.

[0030] Figure 2 is a structural schematic view for showing the buffer block.

[0031] Figure 3 is a structural schematic view for showing the pressing block.

[0032] Figure 4 is a schematic view for showing the position relationship between the fixing part and the plug part.

[0033] Figure 5 is a structural schematic view for showing the fixing part.

[0034] Reference Signs List: 1, hole; 11, oil hole; 12, plug hole; 121, funnel-shaped surface; 13, connecting hole; 2, plug part; 21, buffer block; 22, sealing part; 23, plug part; 231, tapered surface; 24, through hole; 25, pressing block; 26, fitting part; 27, clamping part; 28, screw groove; 3, fixing part; 31, fixing block; 32, fixing part; 33, connecting part; 34, screw thread; 35, relief hole; 4, movable space; 5, screw plug; 51, screw groove; 6, sealing ring. DETAILED DESCRIPTION

[0035] The following will be described in detail in combination with the accompanying drawings. Figures 1-5 The present application will be further described in detail.

[0036] Reference Figure 1The application discloses a sealing structure for a hydraulic system, which comprises a plug 2 arranged in a hole 1. In the embodiment, the hole 1 is an auxiliary hole arranged on a hydraulic system integrated block and used for connecting oil channels in the hydraulic system integrated block. The hole 1 is a through hole. The hole 1 comprises an oil hole 11, a plug hole 12 and a connecting hole 13. In the embodiment, the oil hole 11, the plug hole 12 and the connecting hole 13 are coaxially arranged. The plug hole 12 is located between the oil hole 11 and the connecting hole 13. The hole diameter of the connecting hole 13 is larger than that of the plug hole 12. The hole diameter of the plug hole 12 is larger than that of the oil hole 11. The hole wall surface of the plug hole 12 on the side close to the oil hole 11 is provided with a funnel-shaped surface 121. In the embodiment, the hole wall of the plug hole 12 is inclined to the funnel-shaped surface 121 on the side close to the oil hole 11.

[0037] Referring to Figure 1 and 2 , the plug 2 comprises a buffer block 21 arranged in the plug hole 12. In the embodiment, the buffer block 21 can be but is not limited to a nylon block. The nylon block has good toughness, high tensile and compressive strength, strong impact and stress vibration absorption capacity and outstanding fatigue resistance. The buffer block 21 comprises a sealing part 22 and a plug part 23. In the embodiment, the plug part 23 and the sealing part 22 are integrally formed. The cross-sectional diameter of the plug part 23 is larger than that of the sealing part 22. The surface of the plug part 23 on the side close to the sealing part 22 is provided with a conical surface 231. The conical surface 231 is used for fully abutting the funnel-shaped surface 121. A through hole 24 is formed in the plug part 23 and the sealing part 22. The axis of the through hole 24 is collinear with that of the plug hole 12. The through hole 24 is used for checking the internal oil channels of the hydraulic system integrated block by workers.

[0038] Referring to Figure 3 and 4 , the plug 2 further comprises a pressing block 25 arranged in the plug hole 12. The pressing block 25 comprises a fitting part 26 and a clamping part 27. In the embodiment, the fitting part 26 and the clamping part 27 are integrally formed. The fitting part 26 passes through the through hole 24 and is in interference fit with the through hole 24. The clamping part 27 is clamped on the side of the plug part 23 away from the sealing part 22. In the embodiment, the workers press the pressing block 25. The clamping part 27 on the pressing block 25 extrudes the buffer block 21 and presses the sealing part 22 on the buffer block 21 into the oil hole 11. The sealing part 22 is in interference fit with the oil hole 11. At this time, the plug part 23 is clamped on the hole wall on the side of the plug hole 12 close to the oil hole 11. The conical surface 231 on the plug part 23 fully abuts the funnel-shaped surface 121 on the plug hole 12, that is, the plug part 23 is in interference fit with the plug hole 12.

[0039] In the embodiment, the screw groove 28 is arranged on the cooperation portion 26 and the clamping portion 27, and the axis of the screw groove 28 is collinear with the axis of the screw groove 28. The screw groove 28 is used for the worker to use a screwdriver to disassemble the pressing block 25.

[0040] With reference to Figure 4 And 5 The fixing member 3 comprises a fixing block 31, which is composed of a fixing portion 32 and a connecting portion 33. In the embodiment, the fixing portion 32 and the connecting portion 33 are integrally formed. The fixing portion 32 is inserted into the plug hole 12 and abuts against the outer wall of the clamping portion 27 away from the cooperation portion 26. An activity space 4 is left between the fixing portion 32 and the plug hole 12, which can facilitate the rotation of the fixing portion 32 and the connecting portion 33, thereby facilitating the disassembly of the fixing block 31. The connecting portion 33 is provided with a screw thread 34. In the embodiment, the screw thread 34 is arranged along the axial direction of the connecting portion 33, and the screw thread 34 is threadedly connected with the connecting hole 13.

[0041] The fixing block 31 is provided with a tool withdrawal hole 35. In the embodiment, the tool withdrawal hole 35 penetrates the fixing portion 32 and the connecting portion 33. The axis of the tool withdrawal hole 35 is collinear with the axis of the connecting hole 13. The tool withdrawal hole 35 can be, but is not limited to, an internal hexagonal hole. The tool withdrawal hole 35 is used for the worker to use a hexagonal wrench to disassemble the fixing block 31.

[0042] With reference to Figure 4 The sealing ring 6 is sleeved on the screw plug 5. The screw plug 5 is inserted into the connecting hole 13 and is threadedly connected with the connecting hole 13. The screw plug 5 is plugged on the hole opening of the connecting hole 13, and the sealing ring 6 is abutted against the outer wall of the connecting hole 13. The screw plug 5 is provided with a screw groove 51 on the side away from the connecting hole 13, which is used for the worker to disassemble the screw plug 5.

[0043] The implementation principle of the sealing structure for the hydraulic system in the embodiment is as follows. During installation, the worker first inserts the buffer block 21 into the plug hole 12 along the hole opening of the connecting hole 13, and then inserts the pressing block 25 into the plug hole 12 along the circumferential part of the connecting hole 13. In this process, the cooperation portion 26 on the pressing block 25 is inserted into the through hole 24 of the buffer block 21. The clamping portion 27 on the pressing block 25 is pressed, so that the cooperation portion 26 passes through the through hole 24 and is in interference fit with the through hole 24. The clamping portion 27 is clamped on the plugging portion 23 of the buffer block 21. At the same time, in the process of pressing the pressing block 25, the pressing block 25 presses the sealing portion 22 on the buffer block 21 into the oil hole 11. The pressing block 25 deforms the buffer block 21, so that the sealing portion 22 is in interference fit with the oil hole 11, the plugging portion 23 is in interference fit with the plug hole 12, and the tapered surface 231 on the side of the plugging portion 23 close to the sealing portion 22 fully abuts against the funnel-shaped surface 121 on the side of the plug hole 12 close to the oil hole 11.

[0044] Then the fixed block 31 is inserted into the connecting hole 13 along the connecting hole 13, the worker inserts the hex wrench into the tool withdrawal hole 35 on the fixed block 31, rotates the hex wrench, which can drive the fixed part 32 on the fixed block 31 to rotate together with the connecting part 33, so that the thread 34 on the connecting part 33 is screwed with the connecting hole 13, and the connecting part 33 is tightened, at this time, the fixed part 32 will be inserted into the plug hole 12 and abut against the clamping part 27 of the compression block 25; then the sealing ring 6 is sleeved on the plug 5, the plug 5 is inserted into the connecting hole 13 and screwed with the connecting hole 13, the worker can tighten the plug 5 by inserting a screwdriver into the threaded groove 51, the plug 5 is blocked on the hole of the connecting hole 13 and the sealing ring 6 is abutted on the outer wall of the connecting hole 13, that is, the second sealing is completed; the setting of the two seals can enhance the overall sealing effect and reduce the possibility of oil leakage;

[0045] In this process, the sealing part 22 on the buffer block 21 is in interference fit with the oil hole 11, the plug part 23 on the buffer block 21 is in interference fit with the plug hole 12, and the fitting part 26 of the compression block 25 is in interference fit with the through hole 24, so that the buffer block 21 and the compression block 25 can be blocked together in the oil hole 11 and the plug hole 12, so that the buffer block 21 and the compression block 25 can directly seal, thereby enhancing the overall sealing effect;

[0046] When the hydraulic system works at high frequency, the buffer block 21 has high tensile and compressive strength, strong impact and stress vibration absorption capacity, and can absorb the instantaneous pressure impact generated by the high frequency work of the hydraulic system, so as to achieve the effect of buffering, thereby reducing the possibility of displacement of the plug 5 and the sealing ring 6 caused by instantaneous pressure impact, reducing the possibility of leakage, and further ensuring that the hydraulic system can work normally at high frequency; and the buffer block 21 can directly seal in this process, thereby enhancing the sealing of the hole, which is beneficial to reduce the possibility of leakage and enhance the reliability of the sealing;

[0047] When the internal oil circuit of the hydraulic system integrated block needs to be checked, the operator can use a screwdriver to insert into the threaded slot 51, rotate the screwdriver to drive the whole plug 5 to rotate, when the plug 5 is separated from the connecting hole 13, the plug 5 can be taken out together with the sealing ring 6; then the worker uses a hex wrench to insert into the tool withdrawal hole 35 on the fixed block 31, rotates the hex wrench, which can drive the connecting part 33 and the clamping part 27 to rotate, so that the clamping part 27 is separated from the plug hole 12, the connecting part 33 is separated from the connecting hole 13, and the fixed block 31 can be taken out; then the screwdriver is inserted into the screw slot 28 on the pressing block 25, the screwdriver is rotated to drive the whole pressing block 25 to rotate, so that the matching part 26 on the pressing block 25 can be separated from the through hole 24 on the buffer block 21, and the pressing block 25 can be taken out; at this time, since the through hole 24 on the buffer block 21 is a through hole, the through hole 24 is through the whole hole 1, at this time, the worker can directly check the internal oil circuit of the hydraulic system integrated block through the through hole 24 and the hole 1, so that the purpose of checking the internal oil circuit of the hydraulic system integrated block can be achieved, and the problem that the nylon block is difficult to take out when checking the oil circuit can be improved, and the oil circuit can be conveniently checked.

[0048] The above are preferred embodiments of the present application, and do not limit the protection scope of the present application, therefore: any equivalent changes made on the structure, shape, principle of the present application should be covered within the protection scope of the present application.

Claims

1. A sealing structure for a hydraulic system, comprising a screw plug (5) and a sealing ring (6), the sealing ring (6) being fitted on the screw plug (5), the screw plug (5) being intended to be inserted into a hole (1) and to be screwed into the hole (1), the screw plug (5) being intended to be sealed against the mouth of the hole (1), characterized in that: The application further comprises a buffer block (21) arranged in the hole (1), which is used to buffer the instantaneous pressure impact generated during the operation of the hydraulic system, and a pressing block (25) is arranged on the side of the buffer block (21) close to the screw plug (5), a through hole (24) is arranged on the buffer block (21), the pressing block (25) is inserted and abuts in the through hole (24), the through hole (24) is arranged in communication with the hole (1), a fixing member (3) is movably connected in the hole (1), the fixing member (3) is located between the pressing block (25) and the screw plug (5), the fixing member (3) abuts the pressing block (25) on the buffer block (21), the pressing block (25) abuts the buffer block (21) in the hole (1), and a screw groove (28) is arranged on the side of the pressing block (25) away from the buffer block (21); the hole (1) comprises an oil hole (11), a plugging hole (12) and a connecting hole (13) connected with the screw plug (5), the plugging hole (12) is located between the oil hole (11) and the connecting hole (13), the buffer block (21) and the pressing block (25) are arranged in the plugging hole (12), and the fixing member (3) is movably connected with the connecting hole (13); the buffer block (21) comprises a sealing part (22) and a plugging part (23) abutting with the pressing block (25), the diameter of the plugging hole (12) is larger than the diameter of the oil hole (11), the sealing part (22) is pressed into the oil hole (11) by the pressing block (25), and the plugging part (23) is clamped on the hole wall of the plugging hole (12) close to the oil hole (11) on the side close to the sealing part (22); the pressing block (25) comprises a matching part (26) and a clamping part (27), the matching part (26) passes through the through hole (24) and is in interference fit with the through hole (24), and the clamping part (27) is clamped on the side of the plugging part (23) away from the sealing part (22).

2. The seal arrangement for a hydraulic system of claim 1, wherein: The sealing part (22) is in interference fit with the oil hole (11).

3. The seal arrangement for a hydraulic system of claim 1, wherein: The side surface of the plugging part (23) close to the sealing part (22) is arranged as a tapered surface (231), the hole wall surface of the plugging hole (12) close to the oil hole (11) is arranged as a funnel surface (121), and the tapered surface (231) is attached to the funnel surface (121).

4. The seal arrangement for a hydraulic system of claim 1, wherein: The fixing member (3) comprises a fixing block (31), the fixing block (31) is composed of a fixing part (32) and a connecting part (33), the fixing part (32) is inserted into the plugging hole (12) and abuts with the pressing block (25), and a screw thread (34) is arranged on the connecting part (33) and is in screw connection with the connecting hole (13).

5. The seal arrangement for a hydraulic system of claim 4, wherein: An activity space (4) is left between the fixing part (32) and the plugging hole (12), and the activity space (4) is used for the rotation of the fixing part (32).

6. The seal arrangement for a hydraulic system of claim 4, wherein: The connecting hole (13) has a hole diameter larger than that of the plug hole (12), and the connecting part (33) is clamped on one side of the connecting hole (13) close to the plug hole (12).

7. The seal arrangement for a hydraulic system of claim 4, wherein: The fixing block (31) is provided with a tool withdrawal hole (35) for workers to disassemble the fixing block (31).

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