Electro-hydraulic servo valve left end cover structure with high sealing performance

Abstract

The application relates to the technical field of electro-hydraulic servo valves, in particular to a high-sealing electro-hydraulic servo valve left end cover structure which comprises a left end cover and a valve body capable of being detachably connected with the left end cover, a valve cavity is arranged on the left end cover and the valve body and is in communication with each other; a first containing cavity in communication with each other is arranged on the valve body and the left end cover; a sealing groove is arranged on the outer wall of the valve cavity of the left end cover and the valve body; a first sealing ring is arranged in the first containing cavity, a supplementary sealing ring matched with the corresponding sealing groove is arranged on the first sealing ring; and a sealing enhancement mechanism is further arranged in the first containing cavity. The application improves the sealing reliability of the left end cover of the electro-hydraulic servo valve through a double sealing and dynamic adjustment structure, and solves the problem that the traditional single sealing is prone to leakage under high pressure and high frequency vibration working conditions.

Description

Technical Field

[0001] This application relates to the technical field of electro-hydraulic servo valves, and in particular to a left end cap structure for an electro-hydraulic servo valve with high sealing performance. Background Technology

[0002] Electro-hydraulic servo valves are core components of hydraulic control systems, and their sealing performance directly affects the system's stability and reliability. Traditional electro-hydraulic servo valves typically use a single sealing ring at the connection between the end cap and valve body. However, under high pressure and high-frequency vibration conditions, the sealing ring is prone to leakage due to insufficient compression or uneven stress. In existing technologies, the assembly structure of the end cap and valve body is mostly a fixed clearance fit, which cannot dynamically adjust the sealing pressure according to actual operating conditions, posing a risk of seal failure.

[0003] A search revealed Chinese Patent Publication No. CN221838653U, which discloses an electro-hydraulic servo valve end cap assembly, including an end cap body, a sealing gasket, a sealing ring, and end cap screws. A square sealing groove is provided on one side of the end cap body, and a sealing gasket is arranged on the square sealing groove with sealant. Screw holes are provided on the end cap body, and the screw holes correspond one-to-one with the screw holes on the electro-hydraulic servo valve housing. Countersunk holes are arranged on the screw holes, and the sealing rings are arranged one-to-one in the countersunk holes. The end cap screws pass through the countersunk holes and connect the end cap body to the end cap mounting surfaces on both sides of the electro-hydraulic servo valve housing.

[0004] Regarding the aforementioned related technologies, the inventors have discovered the following drawbacks: In existing technologies, under high-pressure, high-frequency vibration conditions, the sealing ring is prone to leakage due to insufficient compression or uneven stress. This application utilizes a sloping transmission structure to compress the sealing ring with an arc-shaped ring plate, adjusting the sealing pressure and compensating for gap fluctuations caused by changes in operating conditions. This solves the leakage problem caused by insufficient compression or uneven stress of the sealing ring under high-pressure, high-frequency vibration conditions in existing technologies, thereby improving sealing reliability. Utility Model Content

[0005] To prevent leakage caused by insufficient compression or uneven stress of the sealing ring under high pressure and high frequency vibration conditions, this application provides a high-sealing electro-hydraulic servo valve left end cover structure.

[0006] This application provides a high-sealing electro-hydraulic servo valve left end cover structure, employing the following technical solution: It includes a left end cover and a valve body detachably connected to the left end cover. Both the left end cover and the valve body have interconnected valve cavities. Both the valve body and the left end cover have interconnected first receiving cavities. Sealing grooves are formed on the outer walls of the valve cavities of both the left end cover and the valve body. A first sealing ring is provided within the first receiving cavity, and a supplementary sealing ring adapted to the corresponding sealing groove is provided on the first sealing ring. A sealing enhancement mechanism is also provided within the first receiving cavity. The first sealing ring provides initial sealing between the left end cover and the valve body, and the sealing enhancement mechanism enhances the sealing after the valve body and the left end cover are combined.

[0007] Optionally, the sealing enhancement mechanism includes two first sliding grooves symmetrically formed on the bottom wall of the first accommodating cavity; each first sliding groove is slidably connected with a first sliding block.

[0008] Optionally, the first sliding block is provided with an arc-shaped ring plate that is adapted to the outer wall of the first sealing ring.

[0009] Optionally, two second sliding grooves are provided on the left end cover, and a second sliding block is slidably connected in each second sliding groove.

[0010] Optionally, the second sliding block is provided with a second inclined surface, and the first sliding block is provided with a first inclined surface that matches the second inclined surface.

[0011] Optionally, the left end cover is provided with a threaded sleeve corresponding to the second sliding groove, and the threaded sleeve is internally threaded with a threaded rod.

[0012] Optionally, the bottom wall of the threaded rod is rotatably connected to the second sliding block.

[0013] Optionally, the upper end face of the threaded rod is provided with a tool insertion hole.

[0014] Optionally, a tension spring is provided on the first sliding block, and the other end of the tension spring is connected to the side wall of the corresponding first sliding groove.

[0015] In summary, this application includes the following beneficial technical effects:

[0016] 1. This utility model provides a sealing groove on the outer wall of the valve cavity of the left end cover and the valve body, and sets a supplementary sealing ring on the first sealing ring so that the supplementary sealing ring is inserted into the sealing groove to form an initial seal, thereby blocking the direct leakage path of fluid along the joint surface.

[0017] 2. This utility model utilizes an arc-shaped ring plate in the sealing enhancement mechanism to compress the first sealing ring, ensuring it fits tightly against the outer wall of the valve cavity, and further compresses the sealing ring to fill minute gaps. This prevents leakage caused by insufficient compression of the sealing ring under high pressure and vibration conditions.

[0018] 3. This utility model uses the threaded connection between the threaded rod and the threaded sleeve, combined with the transmission structure of the second inclined surface and the first inclined surface, to control the stroke of the second sliding block by rotating the threaded rod with a tool (such as a screwdriver), thereby driving the first sliding block to drive the arc-shaped ring plate to squeeze the sealing ring, thus realizing the adjustment of the sealing pressure. Attached Figure Description

[0019] Figure 1 This is a schematic diagram of the overall structure in an embodiment of this application;

[0020] Figure 2 This is a bottom view of the structure of the left end cap in an embodiment of this application;

[0021] Figure 3 This is a schematic diagram of the sealing enhancement mechanism in the embodiments of this application;

[0022] Figure 4 This is a three-dimensional structural schematic diagram of the first sealing ring in an embodiment of this application;

[0023] Figure 5 This is a schematic diagram of the valve body in an embodiment of this application;

[0024] Figure 6 This is a schematic diagram of the arc-shaped ring plate in an embodiment of this application;

[0025] Figure 7 This is a cross-sectional structural diagram of the valve body in an embodiment of this application;

[0026] Figure 8 This is a cross-sectional structural diagram of the left end cap in an embodiment of this application;

[0027] Figure 9 This is a cross-sectional structural diagram of the first sealing ring in an embodiment of this application.

[0028] Reference numerals: 1. Left end cap; 2. Valve body; 3. Valve cavity; 4. First receiving cavity; 5. Sealing groove; 6. First sealing ring; 7. Supplementary sealing ring; 8. First sliding groove; 9. First sliding block; 10. Arc-shaped ring plate; 11. Second sliding groove; 12. Second sliding block; 13. Second inclined surface; 14. First inclined surface; 15. Threaded sleeve; 16. Threaded rod; 17. Tool insertion hole; 18. Tension spring. Detailed Implementation

[0029] The following is in conjunction with the appendix Figures 1-9This application will be further described in detail below. The technical solutions in the embodiments of this application will be clearly described with reference to the accompanying drawings. Obviously, the described embodiments are only some, not all, of the embodiments of this application. All other embodiments obtained by those skilled in the art based on the embodiments of this application are within the scope of protection of this application.

[0030] This application discloses a left end cap structure for a highly sealing electro-hydraulic servo valve. For example... Figure 1 As shown, the device includes a left end cap 1 and a valve body 2 that can be detachably connected to the left end cap 1. Both the left end cap 1 and the valve body 2 have interconnected valve cavities 3. Both the valve body 2 and the left end cap 1 have interconnected first receiving cavities 4. Both the left end cap 1 and the valve body 2 have sealing grooves 5 on their outer walls. A first sealing ring 6 is provided in the first receiving cavity 4, and a supplementary sealing ring 7 that matches the corresponding sealing groove 5 is provided on the first sealing ring 6. A sealing enhancement mechanism is also provided in the first receiving cavity 4.

[0031] In this embodiment, the supplementary sealing ring 7 on the first sealing ring 6 can be inserted into the corresponding sealing groove 5, thereby strengthening the seal after the left end cover 1 and the valve body 2 are combined, so that the supplementary sealing ring 7 and the corresponding sealing groove 5 are tightly fitted; the sealing enhancement mechanism further enhances the overall sealing performance after the left end cover 1 and the valve body 2 are combined.

[0032] Please see Figure 7 The sealing enhancement mechanism includes two first sliding grooves 8 symmetrically formed on the bottom wall of the first accommodating cavity 4; each first sliding groove 8 is slidably connected to a first sliding block 9; the first sliding block 9 is provided with an arc-shaped ring plate 10 adapted to the outer wall of the first sealing ring 6;

[0033] In this embodiment, the first sealing ring 6 is squeezed by the two arc-shaped ring plates 10 moving towards each other, so that the first sealing ring 6 can be tightly attached to the outer wall of the valve cavity 3, thereby preventing the leakage of the medium in the valve body 2.

[0034] Please see Figure 9 The left end cover 1 has two second sliding grooves 11, and a second sliding block 12 is slidably connected in each second sliding groove 11; the second sliding block 12 is provided with a second inclined surface 13, and the first sliding block 9 is provided with a first inclined surface 14 that is adapted to the second inclined surface 13.

[0035] In this embodiment, the second sliding block 12 is transformed into the lateral sliding of the first sliding block 9 by the second inclined surface 13 and the first inclined surface 14, thereby driving the corresponding arc-shaped ring plate 10 to move towards the first sealing ring 6.

[0036] Please see Figure 3The left end cover 1 is provided with a threaded sleeve 15 corresponding to the second sliding groove 11, and a threaded rod 16 is threadedly connected to the threaded sleeve 15; the bottom wall of the threaded rod 16 is rotatably connected to the second sliding block 12; and a tool insertion hole 17 is opened on the upper end face of the threaded rod 16.

[0037] In this embodiment, the threaded rod 16 can only be rotated by inserting a suitable tool into the tool insertion hole 17; through the threaded connection between the threaded rod 16 and the threaded sleeve 15, when the threaded rod 16 moves downward, it can drive the second sliding block 12 to move downward.

[0038] Please see Figure 6 The first sliding block 9 is provided with a tension spring 18, and the other end of the tension spring 18 is connected to the side wall of the corresponding first sliding groove 8.

[0039] In this embodiment, by setting the tension spring 18, when the second sliding block 12 drives the first sliding block 9 to move toward the first sealing ring 6, the tension spring 18 stores force; when the first sliding block 9 is no longer driven by the second sliding block 12, the tension spring 18 drives the first sliding block 9 to reset.

[0040] The implementation principle of the left end cover 1 structure of a high-sealing electro-hydraulic servo valve in this application embodiment is as follows:

[0041] Place the first sealing ring 6 in the first receiving cavity 4 of the left end cover 1 and the valve body 2, and ensure that the two supplementary sealing rings 7 on the first sealing ring 6 are aligned with the sealing grooves 5 on the outer wall of the valve cavity 3 of the left end cover 1 and the valve body 2 respectively. After insertion, the sealing position is initially fixed.

[0042] The left end cap 1 is fixed to the valve body 2 by a detachable connection method (such as bolts), so that the valve chamber 3 and the first accommodating chamber 4 of the two are connected to each other to form a complete fluid channel.

[0043] Insert an adapter tool (such as a screwdriver) into the tool insertion hole 17 at the upper end of the threaded rod 16 and rotate the threaded rod 16. Since the threaded rod 16 and the threaded sleeve 15 are threadedly connected, the threaded rod 16 moves downward along the axis when rotated, pushing the second sliding block 12 below to slide downward synchronously in the second sliding groove 11. The second inclined surface 13 of the second sliding block 12 contacts the first inclined surface 14 of the first sliding block 9, converting the vertical downward movement of the second sliding block 12 into the lateral sliding of the first sliding block 9 (moving towards the first sealing ring 6). The first sliding block 9 drives the arc-shaped ring plate 10 on it to press the outer wall of the first sealing ring 6, so that the sealing ring fits tightly against the outer wall of the valve cavity 3, while supplementing the sealing ring 7 to further deform in the sealing groove 5, enhancing the sealing effect.

[0044] When the first sliding block 9 moves laterally, the tension spring 18 is stretched and stores elastic potential energy, providing power for subsequent reset.

[0045] Through the above adjustments, the arc-shaped ring plate 10 continuously compresses the first sealing ring 6 to compensate for changes in the sealing gap caused by vibration or pressure fluctuations, thus preventing leakage.

[0046] If the operating pressure changes, the stroke of the second sliding block 12 can be adjusted by rotating the threaded rod 16 again, thereby changing the squeezing force of the first sliding block 9 and achieving dynamic adaptive adjustment of the sealing pressure.

[0047] 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 high-sealing electro-hydraulic servo valve left end cover structure, comprising a left end cover and a valve body detachably connected to the left end cover, characterized in that: Both the left end cap and the valve body have interconnected valve cavities; both the valve body and the left end cap have interconnected first receiving cavities; both the left end cap and the valve body have sealing grooves on the outer walls of their valve cavities; a first sealing ring is provided in the first receiving cavity, and a supplementary sealing ring adapted to the corresponding sealing groove is provided on the first sealing ring; a sealing enhancement mechanism is also provided in the first receiving cavity.

2. The left end cover structure of a high-sealing electro-hydraulic servo valve according to claim 1, characterized in that: The sealing enhancement mechanism includes two first sliding grooves symmetrically formed on the bottom wall of the first accommodating cavity; each first sliding groove is slidably connected to a first sliding block.

3. The left end cover structure of a high-sealing electro-hydraulic servo valve according to claim 2, characterized in that: The first sliding block is provided with an arc-shaped ring plate that is adapted to the outer wall of the first sealing ring.

4. The left end cover structure of a high-sealing electro-hydraulic servo valve according to claim 1, characterized in that: The left end cover has two second sliding grooves, and a second sliding block is slidably connected in each second sliding groove.

5. The left end cover structure of a high-sealing electro-hydraulic servo valve according to claim 4, characterized in that: The second sliding block is provided with a second inclined surface, and the first sliding block is provided with a first inclined surface that matches the second inclined surface.

6. The left end cover structure of a high-sealing electro-hydraulic servo valve according to claim 1, characterized in that: The left end cover is provided with threaded sleeves corresponding to the second sliding grooves, and the threaded sleeves are internally threaded with threaded rods.

7. The left end cover structure of a high-sealing electro-hydraulic servo valve according to claim 6, characterized in that: The bottom wall of the threaded rod is rotatably connected to the second sliding block.

8. The left end cover structure of a high-sealing electro-hydraulic servo valve according to claim 7, characterized in that: The upper end face of the threaded rod has a tool insertion hole.

9. The left end cover structure of a high-sealing electro-hydraulic servo valve according to claim 2, characterized in that: The first sliding block is provided with a tension spring, and the other end of the tension spring is connected to the side wall of the corresponding first sliding groove.

Images