A threaded cartridge valve sealing structure

Abstract

This utility model discloses a threaded cartridge valve sealing structure, relating to the field of hydraulic component sealing technology. The utility model includes a valve block, with a valve body threadedly connected to the inner cavity of the valve block. A sealing assembly is disposed on the top of the valve body. The sealing assembly of this utility model forms a dynamic compensation mechanism through the elastic action of a spring. Even if the sealing ring or sealing gasket experiences slight wear during long-term use, the spring will push the sealing plate downwards, ensuring that the sealing ring remains tightly fitted with the sealing gasket, compensating for the sealing gap caused by wear and extending the service life of the sealing structure. The fitting design between the sealing ring and the sealing gasket effectively prevents oil leakage. Furthermore, the sealing plate and sealing ring are rotatably connected; when the valve body and valve block are rotated for assembly, the sealing ring, after contacting the sealing gasket and generating friction, can remain stationary relative to the sealing plate, avoiding relative sliding friction and reducing wear damage to the seals during assembly.

Description

Technical Field

[0001] This utility model belongs to the field of hydraulic component sealing technology, and in particular relates to a threaded cartridge valve sealing structure. Background Technology

[0002] As a core control component in hydraulic systems, threaded cartridge valves are widely used in engineering machinery, agricultural machinery, and industrial hydraulic equipment due to their advantages such as small size, high integration, and convenient installation. Their sealing performance directly determines the working stability of the hydraulic system. Once the seal fails, it can easily lead to faults such as oil circuit pressure loss, system overheating, and oil leakage, which not only affect the normal operation of the equipment but may also cause safety hazards.

[0003] Chinese patent application CN222296598U discloses a threaded cartridge valve, belonging to the field of cartridge valves. It includes a valve sleeve and a valve core, with the valve core inserted from the bottom of the valve sleeve and slidably connected to it. The valve sleeve has an elastic component that applies a downward elastic thrust to the valve core. The valve sleeve includes an upper valve sleeve and a lower valve sleeve, positioned vertically. The bottom end of the upper valve sleeve abuts against the top end of the lower valve sleeve. The bottom of the upper valve sleeve has a first cavity, and the bottom of the lower valve sleeve has a second cavity extending to the bottom of the lower valve sleeve. A circular hole is provided on the outer peripheral wall of the upper valve sleeve, extending to the inner wall of the first cavity. A gasket is provided below the lower valve sleeve, and a first spring is provided between the gasket and the lower valve sleeve. This invention reduces the pressure required for reverse opening, preventing damage due to excessive pressure.

[0004] This patent reduces the pressure required for reverse opening by setting the valve sleeve in two parts, utilizing the difference in elastic force between the elastic component and the first spring, and the specific mating structure between the valve core and the second cavity, thus avoiding damage due to excessive pressure. However, it lacks a targeted sealing structure, making it difficult to guarantee the sealing reliability of the connection between the valve sleeve and the valve block. In contrast, the existing sealing method uses an elastic sealing ring in a specific annular groove in the valve body. Although the elastic deformation of the sealing ring allows it to fit tightly against the mating surface of the valve body and the valve block, thus accommodating certain assembly errors, the elastic sealing ring is prone to aging, deformation, and tearing under long-term high pressure, high temperature, and oil corrosion, resulting in a short sealing life. Furthermore, the installation position of the sealing ring is prone to misalignment, leading to unstable sealing performance. In addition, during the rotational assembly of the threaded cartridge valve, the sealing ring is prone to relative friction with the valve block, exacerbating the wear of the sealing ring and further affecting the sealing performance.

[0005] To address this issue, we provide a threaded cartridge valve sealing structure. Utility Model Content

[0006] The purpose of this invention is to provide a sealing structure for a threaded cartridge valve, which solves the problem of easy failure of the sealing structure of the threaded cartridge valve in the prior art after long-term use through the cooperation of the valve body and the sealing component.

[0007] To solve the above-mentioned technical problems, this utility model is achieved through the following technical solution.

[0008] This utility model relates to a threaded cartridge valve sealing structure, comprising a valve block, a valve body threadedly connected to the inner cavity of the valve block, a sealing assembly on the top of the valve body, and a fixing plate fixedly connected to the inner side of the fixing plate and the valve body. A spring is fixedly connected to the inner cavity of the fixing plate, and a sealing plate is fixedly connected to the bottom of the spring. The surface of the sealing plate is slidably connected to the fixing plate, and a sealing ring is rotatably connected to the bottom of the sealing plate. A sealing groove is formed on the top of the valve block, and a sealing gasket is provided in the inner cavity of the sealing groove. The bottom of the sealing gasket is fixedly connected to the valve block, and the top of the sealing gasket is fitted with the sealing ring. There are multiple springs evenly distributed in the inner cavity of the fixing plate, which can apply a uniform elastic thrust to the sealing plate, preventing the sealing plate from tilting due to uneven force. There are two sealing rings, forming a double sealing defense. Even if one sealing ring is slightly worn, the other can still maintain the sealing effect, greatly reducing the risk of sealing failure. Moreover, its bottom is conical, generating radial expansion force when compressed, making the sealing ring, sealing gasket, and sealing groove fit more tightly, enhancing the high-pressure sealing effect.

[0009] The present invention is further configured such that an indicator component is provided at the bottom of the fixing plate, the indicator component includes a pressure block, both sides of the pressure block are slidably connected to the valve block, an indicator block is slidably connected to the bottom of the pressure block, both sides of the indicator block are fixedly connected to a tension spring, the other end of the tension spring is fixedly connected to the valve body, an indicator groove is provided on the surface of the valve body, an indicator arrow is provided on one side of the indicator groove, the surface of the indicator arrow is slidably connected to the valve block, and the bottom of the indicator arrow is fixedly connected to the indicator block. One side of the bottom of the pressure block is inclined, so that when it moves downward, it can move the indicator block by squeezing the inclined surface. The number of indicator grooves is multiple, which can mark different upward movements of the valve body. When the valve body is displaced due to shaking, the indicator arrow moves with the indicator block to the corresponding groove, which can intuitively reflect the severity of the loosening of the valve body.

[0010] The present invention is further provided with a knob on the top of the fixing plate, and the bottom of the knob is fixedly connected to the valve body. The knob provides the operator with a convenient gripping and force application component, making it easy to manually rotate the valve body to complete the assembly of the sealing component.

[0011] The present invention is further configured such that a limiting rod is provided in the inner cavity of the spring, the bottom of the limiting rod is fixedly connected to the fixed plate, and the surface of the limiting rod is slidably connected to the sealing plate. The limiting rod can limit the range of motion of the fixed plate and prevent it from detaching from the connection with the fixed plate.

[0012] The present invention is further configured such that a groove is provided in the inner cavity of the sealing plate, and a slider is slidably connected to the inner cavity of the groove. The other side of the slider is fixedly connected to the sealing ring. The groove and the slider can provide precise positioning and guidance for the sealing ring, thereby improving its stability during operation.

[0013] The present invention is further configured such that a pulley is slidably connected to the bottom of the fixed plate, and both sides of the pulley are rotatably connected to the pressure block. The pulley can reduce the friction between the pressure block and the fixed plate, making it easier for the operator to rotate the valve body.

[0014] The present invention is further configured such that a limiting groove is formed in the inner cavity of the valve block, a limiting block is slidably connected to the inner cavity of the limiting groove, and the other side of the limiting block is fixedly connected to the pressure block. There are two limiting grooves and two limiting blocks, which are symmetrically distributed on both sides of the pressure block to provide limiting.

[0015] The present invention is further configured such that there are two tension springs, which are symmetrically distributed on both sides of the indicator block. The two symmetrically distributed tension springs can apply uniform tension to both sides of the indicator block to avoid the indicator block from shifting or tilting due to force on one side.

[0016] The present invention has the following beneficial effects.

[0017] 1. The sealing assembly of this utility model forms a dynamic compensation mechanism through the elastic action of the spring. Even if the sealing ring or sealing gasket experiences slight wear during long-term use, the spring will push the sealing plate downward, causing the sealing ring to always remain fitted and pressed tightly with the sealing gasket, compensating for the sealing gap caused by wear and extending the service life of the sealing structure. The sealing ring and sealing gasket adopt an interlocking design, which significantly increases the sealing contact area and fit compared with traditional surface contact seals, effectively preventing oil leakage. Furthermore, the sealing plate and sealing ring are rotatably connected. When the valve body and valve block are assembled, the sealing ring can remain stationary relative to the sealing plate after generating friction with the sealing gasket, avoiding relative sliding friction between the two and reducing wear and damage to the sealing components during assembly.

[0018] 2. When the fixed plate moves down, the indicator component of this utility model drives the pressure block to move down. The pressure block drives the indicator block to move and stretches the tension spring. The indicator block drives the indicator arrow to move to the corresponding indicator slot position. It can promptly capture the upward movement of the valve body caused by shaking. When the valve body moves up, the tension spring resets and drives the indicator block and indicator arrow to move synchronously. The change in the position of the indicator arrow intuitively reflects the looseness of the valve body. This allows operators to quickly complete assembly verification and daily inspection through the indicator component, reducing the difficulty of operation and maintenance costs. Attached Figure Description

[0019] To more clearly illustrate the technical solutions of the embodiments of this utility model, the accompanying drawings used in the description of the embodiments will be briefly introduced below.

[0020] Figure 1 This is a perspective view of a threaded cartridge valve sealing structure.

[0021] Figure 2 This is a perspective view of a sealing component in a threaded cartridge valve sealing structure.

[0022] Figure 3 This is an enlarged view of point A in a threaded cartridge valve sealing structure.

[0023] Figure 4 This is a perspective view of an indicator component in a threaded cartridge valve sealing structure.

[0024] Figure 5 This is an enlarged view of point B in a threaded cartridge valve sealing structure.

[0025] In the attached diagram: 1. Valve block; 2. Valve body; 3. Sealing assembly; 301. Fixing plate; 302. Spring; 303. Sealing plate; 304. Sealing ring; 305. Sealing groove; 306. Sealing gasket; 4. Indicating assembly; 401. Pressure block; 402. Indicating block; 403. Tension spring; 404. Indicating groove; 405. Indicating arrow; 5. Knob; 6. Limiting rod; 7. Slide groove; 8. Slider; 9. Pulley; 10. Limiting groove; 11. Limiting block. Detailed Implementation

[0026] The technical solutions of the present utility model will be described below with reference to the accompanying drawings. The described embodiments are only some embodiments of the present utility model, and not all embodiments.

[0027] Please see Figure 1-5This utility model is a threaded cartridge valve sealing structure, including a valve block 1, a valve body 2 threadedly connected to the inner cavity of the valve block 1, a sealing assembly 3 provided on the top of the valve body 2, the sealing assembly 3 including a fixing plate 301, the inner side of the fixing plate 301 being fixedly connected to the valve body 2, a spring 302 being fixedly connected to the inner cavity of the fixing plate 301, a sealing plate 303 being fixedly connected to the bottom of the spring 302, the surface of the sealing plate 303 being slidably connected to the fixing plate 301, a sealing ring 304 being rotatably connected to the bottom of the sealing plate 303, a sealing groove 305 being provided on the top of the valve block 1, a sealing gasket 306 being provided in the inner cavity of the sealing groove 305, the bottom of the sealing gasket 306 being fixedly connected to the valve block 1, and the top of the sealing gasket 306 being fitted with the sealing ring 304.

[0028] Specifically: There are multiple springs 302, which are evenly distributed in the inner cavity of the fixed plate 301. They can apply a uniform elastic thrust to the sealing plate 303, preventing the sealing plate 303 from tilting due to uneven force. There are two sealing rings 304, forming a double sealing defense. Even if one sealing ring 304 is slightly worn, the other can still maintain the sealing effect, greatly reducing the risk of sealing failure. Moreover, its bottom is conical, which generates radial expansion force when compressed, making the sealing ring 304 fit more tightly with the sealing gasket 306 and the sealing groove 305, enhancing the high-pressure sealing effect.

[0029] Please see Figure 1-5 The bottom of the fixed plate 301 is provided with an indicator component 4, which includes a pressure block 401. Both sides of the pressure block 401 are slidably connected to the valve block 1. An indicator block 402 is slidably connected to the bottom of the pressure block 401. Both sides of the indicator block 402 are fixedly connected with tension springs 403. The other end of the tension springs 403 is fixedly connected to the valve body 2. An indicator groove 404 is opened on the surface of the valve body 2. An indicator arrow 405 is provided on one side of the indicator groove 404. The surface of the indicator arrow 405 is slidably connected to the valve block 1. The bottom of the indicator arrow 405 is fixedly connected to the indicator block 402. The top of the fixed plate 301 is provided with a knob 5. The bottom of the knob 5 is fixedly connected to the valve body 2. A limiting rod 6 is provided in the inner cavity of 302. The bottom of the limiting rod 6 is fixedly connected to the fixed plate 301. The surface of the limiting rod 6 is slidably connected to the sealing plate 303. A sliding groove 7 is provided in the inner cavity of the sealing plate 303. A slider 8 is slidably connected in the inner cavity of the sliding groove 7. The other side of the slider 8 is fixedly connected to the sealing ring 304. A pulley 9 is slidably connected to the bottom of the fixed plate 301. Both sides of the pulley 9 are rotatably connected to the pressure block 401. A limiting groove 10 is provided in the inner cavity of the valve block 1. A limiting block 11 is slidably connected in the inner cavity of the limiting groove 10. The other side of the limiting block 11 is fixedly connected to the pressure block 401. There are two tension springs 403, which are symmetrically distributed on both sides of the indicator block 402.

[0030] Specifically: the bottom side of the pressure block 401 is inclined, so that when it moves downward, it can press the indicator block 402 to move through the inclined surface. The number of indicator grooves 404 is multiple, which can mark different upward movements of the valve body 2. When the valve body 2 is displaced due to shaking, the indicator arrow 405 moves with the indicator block 402 to the corresponding groove, which can intuitively reflect the severity of the looseness of the valve body 2. The knob 5 provides the operator with a convenient grip and force application component, which makes it easy to manually rotate the valve body 2 to complete the assembly of the sealing assembly 3. The limit rod 6 can limit the range of motion of the fixing plate 301 to prevent it from falling off. At the connection point with the fixed plate 301, the sliding groove 7 and the slider 8 provide precise positioning and guidance for the sealing ring 304, improving its operational stability. The pulley 9 reduces the friction between the pressure block 401 and the fixed plate 301, allowing the operator to rotate the valve body 2 more easily. There are two limiting grooves 10 and two limiting blocks 11, symmetrically distributed on both sides of the pressure block 401, which provide positioning. Two symmetrically distributed tension springs 403 can apply uniform tension to both sides of the indicator block 402, preventing the indicator block 402 from shifting or tilting due to unilateral force.

[0031] The working principle of this utility model is as follows: During installation, the valve body 2 is inserted into the sealing groove 305 of the valve block 1 and rotated. As the valve body 2 rotates and moves downward, it causes the fixing plate 301 to move downward. The fixing plate 301 causes the sealing plate 303 to move downward and compress the spring 302. When the sealing ring 304 contacts the sealing gasket 306, it cannot rotate with the sealing plate 303. When the spring 302 is fully compressed, while the valve body 2 is still moving downward, the fixing plate 301 will apply pressure to the sealing ring 304 through the sealing plate 303 and make it embed into the sealing gasket 306, achieving tight sealing and dynamic compensation. At the same time, when the fixing plate 301 moves downward and contacts the pulley 9, it will cause the pressure block 401 to move downward. The pressure block 401 presses the indicator block 402 through the inclined surface and moves it. The indicator block 402 stretches the tension spring 403 and then causes the indicator arrow 405 to move and approach the corresponding indicator groove 404. After long-term use, the upward movement caused by the loosening of the valve body 2 will be clearly shown on the indicator arrow 405 and the indicator groove 404.

[0032] The preferred embodiments of the present utility model disclosed above are only used to help illustrate the present utility model. The preferred embodiments do not describe all the details in detail, nor do they limit the present utility model to the specific implementation methods described. The present specification selects and specifically describes these embodiments in order to better explain the principle and practical application of the present utility model, so that those skilled in the art can better understand and utilize the present utility model.

Claims

1. A threaded cartridge valve sealing structure, comprising a valve block (1), characterized in that: The valve block (1) has a valve body (2) threadedly connected to its inner cavity, and a sealing assembly (3) is provided on the top of the valve body (2). The sealing assembly (3) includes a fixing plate (301), the inner side of which is fixedly connected to the valve body (2), a spring (302) is fixedly connected to the inner cavity of the fixing plate (301), a sealing plate (303) is fixedly connected to the bottom of the spring (302), the surface of the sealing plate (303) is slidably connected to the fixing plate (301), a sealing ring (304) is rotatably connected to the bottom of the sealing plate (303), a sealing groove (305) is provided on the top of the valve block (1), a sealing gasket (306) is provided in the inner cavity of the sealing groove (305), the bottom of the sealing gasket (306) is fixedly connected to the valve block (1), and the top of the sealing gasket (306) is fitted with the sealing ring (304).

2. The threaded cartridge valve sealing structure according to claim 1, characterized in that: The bottom of the fixed plate (301) is provided with an indicator component (4), the indicator component (4) includes a pressure block (401), both sides of the pressure block (401) are slidably connected to the valve block (1), the bottom of the pressure block (401) is slidably connected to an indicator block (402), both sides of the indicator block (402) are fixedly connected to a tension spring (403), the other end of the tension spring (403) is fixedly connected to the valve body (2), the surface of the valve body (2) is provided with an indicator groove (404), one side of the indicator groove (404) is provided with an indicator arrow (405), the surface of the indicator arrow (405) is slidably connected to the valve block (1), and the bottom of the indicator arrow (405) is fixedly connected to the indicator block (402).

3. The threaded cartridge valve sealing structure according to claim 1, characterized in that: The top of the fixing plate (301) is provided with a knob (5), and the bottom of the knob (5) is fixedly connected to the valve body (2).

4. The threaded cartridge valve sealing structure according to claim 1, characterized in that: The inner cavity of the spring (302) is provided with a limiting rod (6), the bottom of the limiting rod (6) is fixedly connected to the fixing plate (301), and the surface of the limiting rod (6) is slidably connected to the sealing plate (303).

5. The threaded cartridge valve sealing structure according to claim 1, characterized in that: The sealing plate (303) has a groove (7) in its inner cavity, and a slider (8) is slidably connected to the inner cavity of the groove (7). The other side of the slider (8) is fixedly connected to the sealing ring (304).

6. The threaded cartridge valve sealing structure according to claim 2, characterized in that: The bottom of the fixed plate (301) is slidably connected to a pulley (9), and both sides of the pulley (9) are rotatably connected to the pressure block (401).

7. The threaded cartridge valve sealing structure according to claim 2, characterized in that: The valve block (1) has a limiting groove (10) in its inner cavity, and a limiting block (11) is slidably connected to the inner cavity of the limiting groove (10). The other side of the limiting block (11) is fixedly connected to the pressure block (401).

8. The threaded cartridge valve sealing structure according to claim 2, characterized in that: There are two tension springs (403), which are symmetrically distributed on both sides of the indicator block (402).

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