A seal structure 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 screw plug and a sealing ring, the sealing ring is sleeved on the screw plug, the screw plug is used for being inserted into a hole and being screwed with the hole, the screw plug is blocked on the hole mouth of the hole, and the sealing structure further comprises a sealing block and a fastening block arranged in the hole, the sealing block is used for buffering instantaneous pressure impact generated during hydraulic system work, the fastening block is located between the screw plug and the sealing block, and the fastening block fixes the sealing block in the hole. When the hydraulic system works at high frequency, the instantaneous pressure impact generated by the hydraulic system can be buffered by the sealing block, so that the situation that the screw plug and the sealing ring are abnormally positioned due to the instantaneous pressure impact is reduced, the possibility of oil leakage is reduced, and the normal work of the hydraulic system at high frequency is ensured; and the sealing block also plays a direct sealing role, so that the sealing of the hole is strengthened.

Description

Technical Field

[0001] This application relates to the field of hydraulic system sealing technology, and in particular to a sealing structure for hydraulic systems. Background Technology

[0002] The integrated block design makes hydraulic system design more compact, convenient, and maximizes integration. The key aspects of hydraulic component integrated block design are the selection and arrangement of hydraulic components and the design of the valve block. The communication of hydraulic component oil circuits is achieved inside the valve block and cannot be directly observed from the outside. Therefore, the correct and reasonable design of the internal oil circuits of the valve block is crucial. During processing, holes need to be added to connect the channels on different surfaces within the oil circuit. After the oil circuits are connected, the holes need to be sealed.

[0003] Currently, hole sealing typically employs a combination of a plug and a sealing ring. During installation, the operator places the sealing ring onto the plug, then inserts the plug into the hole. The plug and hole are threaded together, with the plug sealing the hole opening and the sealing ring pressing against the outer wall of the hole. During operation, when the hydraulic system pressure is low and the load variation is minimal, the plug and sealing ring provide a good seal. However, when the working pressure exceeds 20 MPa and the hydraulic cylinder operates frequently, the instantaneous pressure generated during high-frequency operation is several times the normal operating pressure. Under these conditions, the plug and sealing ring installed in the hole are susceptible to displacement due to instantaneous pressure impacts, leading to leakage. This reduces the volumetric efficiency of the hydraulic system, and in severe cases, prevents the hydraulic system from building up pressure and rendering it inoperable. Summary of the Invention

[0004] In order to improve the problem of leakage that easily occurs when hydraulic systems operate at high frequencies, this application provides a sealing structure for hydraulic systems.

[0005] The sealing structure for a hydraulic system provided in this application adopts the following technical solution:

[0006] A sealing structure for a hydraulic system includes a screw plug and a sealing ring, the sealing ring being fitted onto the screw plug, the screw plug being inserted into a hole and threadedly connected to the hole, the screw plug sealing the opening of the hole, and further including a sealing block and a fastening block disposed within the hole, the sealing block being used to buffer instantaneous pressure impacts generated during the operation of the hydraulic system, the fastening block being located between the screw plug and the sealing block, the fastening block fixing the sealing block within the hole.

[0007] By adopting the above technical solution, during installation, the sealing block is inserted into the hole, followed by the fastening block, which fixes the sealing block in the hole. Then, the sealing ring is fitted onto the screw plug, and the screw plug is threaded into the hole. The screw plug seals the opening of the hole, and the sealing ring abuts against the outer wall of the hole. When the hydraulic system operates at high frequency, the instantaneous pressure impact generated can be buffered by the sealing block, thereby reducing the possibility of displacement of the screw plug and sealing ring due to instantaneous pressure impact, reducing the possibility of leakage, and ensuring the normal operation of the hydraulic system during high-frequency operation. Furthermore, the sealing block, screw plug, and sealing ring form a double seal, with the sealing block playing a direct sealing role in this process, thus strengthening the sealing of the hole.

[0008] In one specific implementation, the hole consists of an oil passage hole, a sealing hole, and a mounting hole connected to the screw plug, with the sealing hole located between the oil passage hole and the mounting hole; the fastening block is connected to the mounting hole, and the fastening block presses the sealing block against the sealing hole, thereby sealing the oil passage hole.

[0009] By adopting the above technical solution, during installation, the sealing block is placed into the sealing hole, and the fastening block is connected to the mounting hole. The fastening block presses the sealing block against the sealing hole, thus fixing the sealing block. When the hydraulic system operates at high frequency, the sealing block blocks the opening of the oil passage hole, enabling the sealing block to buffer the instantaneous pressure impact generated by the high-frequency operation of the hydraulic system and achieve a direct sealing effect.

[0010] In one specific implementation, the diameter of the sealing hole is larger than the diameter of the oil passage hole, and the fastening block forces the sealing block into the oil passage hole.

[0011] By adopting the above technical solution, and by setting the diameter of the sealing hole to be larger than that of the oil passage hole, the sealing block will be pressed against the sealing hole when the fastening block fixes the sealing block, and the fastening block will squeeze the sealing block into the oil passage hole; thus, when the hydraulic system is working at high frequency, the sealing block can play a better role in direct sealing and can play a better role in buffering.

[0012] In one specific implementation, the outer wall surface of the sealing block on the side away from the fastening block is a conical surface, and the hole wall surface of the sealing hole on the side near the oil passage hole is a funnel-shaped surface, with the conical surface and the funnel-shaped surface fitting together.

[0013] By adopting the above technical solution, the setting of the conical surface and the funnel-shaped surface allows the fastening block to more smoothly squeeze one side of the conical surface of the sealing block into the oil passage hole along the funnel-shaped surface of the sealing hole during the installation process. Furthermore, the close fit between the conical surface and the funnel-shaped surface enables the sealing block to better achieve the effects of buffering and sealing.

[0014] In one specific implementation, the fastening block includes a retaining block and a connecting block connected to the mounting hole, wherein the retaining block is inserted into the sealing hole and abuts against the sealing block.

[0015] By adopting the above technical solution, during installation, the clamping block is inserted into the sealing hole, and the connecting block is connected to the mounting hole. At this time, the clamping block and the sealing block abut against each other, which can press the sealing block tightly into the sealing hole.

[0016] In one specific implementation, the outer wall of the connecting block is provided with threads, and the threads are threadedly connected to the mounting hole.

[0017] By adopting the above technical solution, during installation, the clamping block is inserted into the sealing hole, and the connecting block is tightened. The connecting block is threadedly connected to the mounting hole, so that the fastening block and the mounting hole can be detachably connected.

[0018] In one specific implementation, a rotational space is provided between the abutment block and the sealing hole.

[0019] By adopting the above technical solution, during installation, the clamping block is inserted into the sealing hole, and the connecting block is rotated so that the thread on the connecting block is connected to the thread of the mounting hole. During this process, the rotating connecting block will drive the clamping block to rotate. At this time, the setting of the rotation space allows the clamping block to rotate smoothly, thereby facilitating the connection between the connecting block and the mounting hole.

[0020] In one specific implementation, the diameter of the mounting hole is larger than the diameter of the sealing hole, and the outer wall of the connecting block near the abutting block abuts against the wall of the mounting hole near the sealing hole.

[0021] By adopting the above technical solution, and utilizing the fact that the diameter of the mounting hole is larger than that of the sealing hole, during the installation process, the outer wall of the connecting block near the clamping block will abut against the wall of the mounting hole near the sealing hole. This restricts the position of the connecting block and the clamping block during the tightening of the connecting block, so that the clamping block can not only tighten and fix the sealing block, but also provide sufficient buffer space for the sealing block, thereby enabling the sealing block to play a better buffering role.

[0022] In one specific implementation, the connecting block is provided with a tool retraction hole, which is used by workers to disassemble the fastening block.

[0023] By adopting the above technical solution, and with the setting of the retraction hole, when disassembly is required, the operator can use an auxiliary tool to insert into the retraction hole and rotate it, so that the fastener can be disengaged from the mounting hole, thereby facilitating the disassembly of the fastener.

[0024] In summary, this application includes at least one of the following beneficial technical effects:

[0025] 1. A sealing structure for a hydraulic system according to this application can buffer the instantaneous pressure impact generated when the hydraulic system operates at high frequency, thereby reducing the possibility of displacement of the screw plug and sealing ring due to instantaneous pressure impact, reducing the possibility of leakage, and ensuring the normal operation of the hydraulic system at high frequency; the sealing block can play a direct sealing role in this process, thereby strengthening the sealing of the hole, and the sealing block, screw plug and sealing ring can form a double seal, strengthening the overall sealing effect, thereby reducing the possibility of oil leakage;

[0026] 2. A sealing structure for a hydraulic system according to this application, by setting the diameter of the sealing hole to be larger than the diameter of the oil passage hole, so that when the fastening block fixes the sealing block, it will press the sealing block against the sealing hole, and the fastening block will squeeze the sealing block into the oil passage hole; thereby, when the hydraulic system is working at high frequency, the sealing block can better play the role of direct sealing and can better play the role of buffering.

[0027] 3. A sealing structure for a hydraulic system according to this application utilizes the fact that the diameter of the mounting hole is larger than the diameter of the sealing hole. During installation, the outer wall of the connecting block near the abutment block will abut against the wall of the mounting hole near the sealing hole. This restricts the position of the connecting block and the abutment block during the tightening of the connecting block, so that the abutment block can not only tighten and fix the sealing block, but also provide sufficient buffer space for the sealing block, thereby enabling the sealing block to better play a buffering role. Attached Figure Description

[0028] Figure 1 This is a schematic diagram of a sealing structure for a hydraulic system according to an embodiment of this application.

[0029] Figure 2 This is a schematic diagram used to illustrate the structure of the sealing block.

[0030] Figure 3 It is a schematic diagram used to show the positional relationship between the fastening block and the sealing block.

[0031] Figure 4 This is a structural diagram used to illustrate the fastening block.

[0032] Explanation of reference numerals in the attached drawings: 1. Hole; 11. Oil passage hole; 12. Sealing hole; 121. Funnel-shaped surface; 13. Mounting hole; 2. Plug; 21. Threaded groove; 3. Sealing ring; 4. Sealing block; 41. Conical surface; 5. Fastening block; 51. Connecting block; 511. Thread; 52. Clamping block; 53. Retraction hole; 6. Rotation space. Detailed Implementation

[0033] The following is in conjunction with the appendix Figure 1-4 This application will be described in further detail.

[0034] Reference Figure 1 This application discloses a sealing structure for a hydraulic system, including a sealing block 4 for insertion into a hole 1. In this embodiment, the hole 1 is an auxiliary hole provided on the hydraulic system integrated block, which is used to connect the oil circuit in the hydraulic system integrated block. The hole 1 is a through hole. The hole 1 is composed of an oil circuit hole 11, a sealing hole 12, and a mounting hole 13. In this embodiment, the oil circuit hole 11, the sealing hole 12, and the mounting hole 13 are coaxially arranged. The sealing hole 12 is located between the oil circuit hole 11 and the mounting hole 13. The diameter of the mounting hole 13 is larger than the diameter of the sealing hole 12. The diameter of the sealing hole 12 is larger than the diameter of the oil circuit hole 11. The surface of the hole wall of the sealing hole 12 near the oil circuit hole 11 is set as a funnel-shaped surface 121. In this embodiment, the hole wall of the sealing hole 12 is inclined to the side of the hole wall of the oil circuit hole 11 to form a funnel-shaped surface 121.

[0035] Reference Figure 1 and Figure 2 The sealing block 4 is inserted into the mounting hole 13 and moved into the sealing hole 12. In this embodiment, the axis of the sealing block 4 is collinear with the axis of the sealing hole 12. The sealing block 4 is used to buffer the instantaneous pressure impact generated when the hydraulic system is working. In this embodiment, the sealing block 4 can be, but is not limited to, a nylon block. Nylon blocks have good toughness, high tensile and compressive strength, strong absorption capacity for impact and stress vibration, and outstanding fatigue resistance. They can maintain their original mechanical strength even after repeated bending. The outer wall surface of the sealing block 4 near the oil passage hole 11 is set as a conical surface 41. In this embodiment, the apex angle of the conical surface 41 is an obtuse angle.

[0036] Reference Figure 3 and Figure 4 It also includes a fastening block 5 located within the mounting hole 13. In this embodiment, the fastening block 5 can be, but is not limited to, a steel block. The fastening block 5 includes a clamping block 52 and a connecting block 51. In this embodiment, the clamping block 52 and the connecting block 51 are integrally formed. The connecting block 51 is located within the mounting hole 13 and has a thread 511. The thread 511 is threadedly connected to the mounting hole 13. The outer wall of the connecting block 51 near the clamping block 52 abuts against the hole wall of the mounting hole 13 near the sealing hole 12. 2. Insert the sealing block 4 into the sealing hole 12 and abut against the sealing block 4. The pressing block 52 pushes one side of the conical surface 41 on the sealing block 4 into the oil passage hole 11 along the funnel-shaped surface 121 on the sealing hole 12. In this embodiment, the part of the sealing block 4 that is pushed into the oil passage hole 11 will be deformed to a certain extent. The pressing block 52 fully fits the conical surface 41 and the funnel-shaped surface 121. A rotation space 6 is left between the pressing block 52 and the sealing hole 12. The rotation space 6 can facilitate the rotation of the connecting block 51 and the pressing block 52, thereby facilitating the disassembly of the fastening block 5.

[0037] Reference Figure 3 and Figure 4 In this embodiment, the connecting block 51 and the fastening block 5 are both provided with a tool retraction hole 53. In this embodiment, the axis of the tool retraction hole 53 is collinear with the axis of the mounting hole 13. In this embodiment, the tool retraction hole 53 can be, but is not limited to, an internal hexagonal hole. The tool retraction hole 53 is used for workers to use a hexagonal wrench to remove the fastener.

[0038] Reference Figure 3 It also includes a sealing ring 3 and a screw plug 2. The sealing ring 3 is fitted onto the screw plug 2. The screw plug 2 is inserted into the mounting hole 13 and threadedly connected to the mounting hole 13. The screw plug 2 seals the opening of the mounting hole 13 and presses the sealing ring 3 against the outer wall of the mounting hole 13. A threaded groove 21 is provided on the side of the screw plug 2 away from the mounting hole 13. The threaded groove 21 allows the operator to remove the screw plug 2.

[0039] The implementation principle of a sealing structure for a hydraulic system according to an embodiment of this application is as follows: During installation, the operator first inserts the sealing block 4 into the sealing hole 12 along the opening of the mounting hole 13, and then inserts the fastening block 5 into the mounting hole 13 along the opening of the mounting hole 13. The operator uses a hex wrench inserted into the relief hole 53 on the connecting block 51 and rotates the hex wrench, which drives the connecting block 51 and the abutment block 52 to rotate, thereby making the thread 511 on the connecting block 51 threadedly connected to the mounting hole 13. When the connecting block 51 is tightened, the abutment block 52 will be inserted into the sealing hole 12 and abut against the sealing block 4. During this tightening process, the abutment block 52 will push the conical surface 41 side of the sealing block 4 along the sealing block 4. The funnel-shaped surface 121 on the sealing hole 12 is squeezed into the oil passage hole 11. The clamping block 52 fully fits the conical surface 41 with the funnel-shaped surface 121, thus fixing the sealing block 4 and completing the first seal. Then, the sealing ring 3 is fitted onto the screw plug 2, and the screw plug 2 is inserted into the mounting hole 13 and threadedly connected to the mounting hole 13. The operator can use a screwdriver to insert into the threaded groove 21 and tighten the screw plug 2. The screw plug 2 seals the opening of the hole 1 and the sealing ring 3 abuts against the outer wall of the hole 1, thus completing the second seal. The sealing block 4, the fastening block 5, the screw plug 2, and the sealing ring 3 together form two seals, which can enhance the overall sealing effect and reduce the possibility of oil leakage.

[0040] When the hydraulic system operates at high frequency, the sealing block 4, with its high tensile and compressive strength and strong ability to absorb impact and stress vibration, can absorb the instantaneous pressure impact generated by the high-frequency operation of the hydraulic system, achieving a buffering effect. This reduces the possibility of displacement between the screw plug 2 and the sealing ring 3 due to instantaneous pressure impact, thus reducing the possibility of leakage and ensuring the normal operation of the hydraulic system during high-frequency operation. Furthermore, the sealing block 4 can play a direct sealing role in this process, thereby strengthening the seal of the hole 1.

[0041] When it is necessary to inspect the internal oil passage of the valve block, it can be done through hole 1. At this time, the operator can use a screwdriver to insert into the threaded groove 21 and rotate the screwdriver to drive the entire screw plug 2 to rotate. When the screw plug 2 is disengaged from the mounting hole 13, the screw plug 2 and the sealing ring 3 can be removed together. Then, the operator can use a hex wrench to insert into the relief hole 53 on the connecting block 51 and rotate the hex wrench to drive the connecting block 51 and the clamping block 52 to rotate, so that the clamping block 52 is disengaged from the sealing hole 12 and the connecting block 51 is disengaged from the mounting hole 13. The fastening block 5 can then be removed, that is, the fastening block 5 is removed from fixing the sealing block 4. Then the sealing block 4 can be removed to complete the disassembly of the sealing structure. Thus, the internal oil passage of the valve block can be inspected through hole 1, thereby achieving the purpose of inspecting the internal oil passage of the valve block.

[0042] The above are all preferred embodiments of this application, and are not intended to limit the scope of protection of this application. Therefore, all equivalent changes made in accordance with the structure, shape and principle of this application should be covered within the scope of protection of this application.

Claims

1. A sealing structure for a hydraulic system, comprising a screw plug (2) and a sealing ring (3), wherein the sealing ring (3) is fitted onto the screw plug (2), the screw plug (2) is used to insert into a hole (1) and be threadedly connected to the hole (1), and the screw plug (2) seals the opening of the hole (1), characterized in that: It also includes a sealing block (4) and a fastening block (5) disposed in the hole (1). The sealing block (4) is used to buffer the instantaneous pressure impact generated when the hydraulic system is working. The fastening block (5) is located between the screw plug (2) and the sealing block (4). The fastening block (5) fixes the sealing block (4) in the hole (1). The hole (1) consists of an oil passage hole (11), a sealing hole (12) and an installation hole (13) connected to the screw plug (2). The sealing hole (12) is located between the oil passage hole (11) and the installation hole (13). The fastening block (5) is connected to the installation hole (13). The fastening block (5) presses the sealing block (4) against the sealing hole (12). The sealing block (4) seals the oil passage hole (11). The diameter of the sealing hole (12) is larger than the diameter of the oil passage hole (11). The fastening block (5) squeezes the sealing block (4) into the oil passage hole (11). The outer wall surface of the sealing block (4) away from the fastening block (5) is set as a conical surface (41). The hole wall surface of the sealing hole (12) near the oil passage hole (11) is set as a funnel-shaped surface (121). The conical surface (41) fits against the funnel-shaped surface (121).

2. The sealing structure for a hydraulic system according to claim 1, characterized in that: The fastening block (5) includes a clamping block (52) and a connecting block (51) connected to the mounting hole (13). The clamping block (52) is inserted into the sealing hole (12) and abuts against the sealing block (4).

3. The sealing structure for a hydraulic system according to claim 2, characterized in that: The outer wall of the connecting block (51) is provided with a thread (511), and the thread (511) is threadedly connected to the mounting hole (13).

4. The sealing structure for a hydraulic system according to claim 2, characterized in that: There is a rotation space (6) between the clamping block (52) and the sealing hole (12).

5. The sealing structure for a hydraulic system according to claim 2, characterized in that: The diameter of the mounting hole (13) is larger than the diameter of the sealing hole (12), and the outer wall of the connecting block (51) near the abutting block (52) abuts against the wall of the mounting hole (13) near the sealing hole (12).

6. The sealing structure for a hydraulic system according to claim 2, characterized in that: The connecting block (51) has a tool retraction hole (53) for workers to disassemble the fastening block (5).

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