A stop valve with filtering function

Abstract

The utility model discloses a stop valve with filter function, its technical scheme main points are including valve body, the valve seat of being located in the valve body and can with the valve core of valve seat formation hard seal, the valve core is provided with with the valve core coaxial and can with the seal portion of valve seat close -fitted, the face of valve core to valve seat is provided with multiple can relative valve core telescopic and be located on the same circumference on the push rod, one simultaneously with multiple push rod one end link's filter component and with multiple push rod one to one corresponding and push corresponding push rod to valve seat's spring, multiple springs all are limited in the valve core inside, multiple push rod is not linked with filter component one end all are limited in the valve core inside, multiple push rod the circumference and filter component all with valve core coaxial arrangement, filter component's maximum diameter and multiple push rod the circumference diameter all are less than the inner diameter of valve seat, set up on the valve seat inner wall with valve seat coaxial and can with filter component top touch's limit ring, solved the prior art to exist and seal surface easy to wear problem of close not tightly.

Description

Technical Field

[0001] This utility model relates to the field of gate valve technology, and more specifically to a gate valve with a filtering function. Background Technology

[0002] Gate valves are among the most widely used types of valves. They offer advantages such as low friction between sealing surfaces during opening and closing, durability, small opening height, ease of manufacturing, and convenient maintenance. Therefore, these valves are well-suited for shut-off or regulation functions. While existing gate valves generally meet user needs, some problems remain. During the initial opening or near-closing process, the small gap between the valve core and seat allows impurities in the medium to easily impact the sealing surfaces, leading to accelerated wear. After repeated opening and closing, the seal between the valve core and seat deteriorates, causing leakage. Furthermore, during closing, impurities can become trapped between the sealing surfaces of the valve core and seat, affecting their fit and reducing sealing performance. Utility Model Content

[0003] In view of the shortcomings of the existing technology, the purpose of this utility model is to provide a shut-off valve that can filter the medium during the initial opening and closing process, effectively reduce the wear of the sealing structure, and improve the sealing stability between the valve seat and the valve core.

[0004] To achieve the above objectives, this utility model provides the following technical solution: a shut-off valve with a filtering function, comprising a valve body, a valve seat located within the valve body, and a valve core capable of forming a hard seal with the valve seat. The valve core is provided with a sealing part coaxial with the valve core and capable of tightly fitting with the valve seat. On the surface of the valve core facing the valve seat, there are multiple push rods that can extend and retract relative to the valve core and are located on the same circumference, a filter assembly connected to one end of the multiple push rods, and springs corresponding to the multiple push rods and pushing the corresponding push rods towards the valve seat. The multiple springs are all confined inside the valve core. The ends of the multiple push rods not connected to the filter assembly are all confined inside the valve core. The circumference of the multiple push rods and the filter assembly are coaxial with the valve core. The maximum diameter of the filter assembly and the diameter of the circumference of the multiple push rods are both smaller than the inner diameter of the valve seat. A limiting ring coaxial with the valve seat and capable of contacting the filter assembly is provided on the inner wall of the valve seat. The medium flows to the valve core after being filtered by the filter assembly through the contact between the filter assembly and the limiting ring.

[0005] As a further improvement of this utility model, the filter assembly includes a filter screen, two clamping rings that jointly hold the filter screen, and a plurality of fastening screws that pass through the two clamping rings and the filter screen and are threadedly connected to the corresponding push rods. The nuts of the plurality of fastening screws are all located in the clamping rings away from the push rods.

[0006] As a further improvement of this utility model, the inner cavity of the limiting ring is frustum-shaped with its large end facing the valve core, and the large diameter of the clamping ring is between the diameters of the two ends of the inner cavity of the limiting ring.

[0007] As a further improvement of this utility model, a sealing element is provided between the valve core and the multiple push rods to prevent the medium from entering the valve core.

[0008] The beneficial effects of this utility model are as follows: By having the filter assembly and the limiting ring contact each other, the medium flows to the valve core after being filtered by the filter assembly. Compared with the prior art, this design can avoid impurities being trapped between the valve core and the valve seat, effectively improving the fit between the valve core and the valve seat, forming a stable seal, and at the same time reducing the damage of impurities to the sealing part. During the opening and closing stages, the filter screen plays a certain role in throttling the medium, thereby reducing the subsequent scouring force of the medium on the valve seat and valve core, effectively ensuring the structural stability of the valve core and valve seat. Attached Figure Description

[0009] Figure 1 This is a front sectional view of the present invention; Figure 2 for Figure 1 Enlarged view of point A in the middle; Figure 3 for Figure 2 A diagram showing the state when the filter assembly is in contact with the top of the limit ring and the valve core is not closed to the valve seat. Figure 4 This is an assembly drawing of a portion of the valve core and filter assembly in this utility model; Figure 5 for Figure 4 Exploded view.

[0010] Reference numerals: 1. Valve body; 2. Valve seat; 3. Valve core; 4. Sealing part; 5. Push rod; 6. Filter assembly; 61. Filter screen; 62. Clamping ring; 63. Fastening screw; 7. Spring; 8. Limiting ring; 9. Seal. Detailed Implementation

[0011] The present invention will be further described in detail below with reference to the accompanying drawings and embodiments. Identical components are indicated by the same reference numerals.

[0012] Reference Figures 1 to 5 As shown, a shut-off valve with a filtering function in this embodiment includes a valve body 1, a valve seat 2 located inside the valve body 1, and a valve core 3 that can form a hard seal with the valve seat 2. The valve core 3 is provided with a sealing part 4 that is coaxial with the valve core 3 and can be tightly attached to the valve seat 2. Based on the aforementioned prior art, four rod holes and four threaded holes are machined on the surface of the valve core 3 where the sealing part 4 is located. The four rod holes and four threaded holes are all located on the same circumference and are alternately arranged. The circumference of the four rod holes is coaxial with the valve core 3, and the diameter of the circumference of the four rod holes is smaller than the diameter of the sealing part 4. A limit cover is detachably connected to the valve core 3. The limit cover is machined with through holes corresponding to the threaded holes and through holes corresponding to the rod holes. The inner diameter of the through holes is smaller than the inner diameter of the rod holes. The push rod 5 includes an end body adapted to the inner diameter of the rod holes and a rod body adapted to the inner diameter of the through holes. A connecting hole is machined on the end face of the rod body that is not connected to the end body. The spring 7 has a relatively large elastic coefficient and is suitable for the pressure of the medium. The filter assembly 6 is affected by little force or is not affected by the medium. It includes a filter screen 61, two clamping rings 62 and four fastening screws 63. The maximum diameter of the two clamping rings 62 and the circumference diameter of the push rod 5 are both smaller than the inner diameter of the valve seat 2. The two clamping rings 62 have different thicknesses. The thinner clamping ring 62 has four through holes for the fastening screws 63 to pass through, and the thicker clamping ring 62 has four countersunk holes for the fastening screws 63 to pass through and for the nuts to be accommodated. The filter screen 61 has filter holes and through holes for the fastening screws 63 to pass through. A limiting ring 8 coaxial with the inner cavity of the valve seat 2 is integrally formed on the inner wall of the valve seat 2. The inner diameter of the limiting ring 8 is smaller than the maximum diameter of the clamping rings 62. During assembly, the ends of spring 7 and push rod 5 are first inserted into the rod holes in sequence. After all four rod holes are in place, the limiting cover is simultaneously placed on the four push rods 5 and moved to a position that fits against the end face of valve core 3. The bolt is passed through the through hole of the limiting cover and screwed into the threaded hole of the valve core to fix the limiting cover to the valve core 3. The ends of push rod 5 and spring 7 are both limited in the rod holes. Then, the thin clamping ring 62, filter screen 61 and thick clamping ring 62 are stacked on the end faces of the four push rods 5 in sequence. Then, the fastening screw 63 is passed through the thick clamping ring 62, filter screen 61 and thin clamping ring 62 in sequence and screwed into the connecting hole of push rod 5. The two clamping rings 62 clamp the filter screen 61 together. All four push rods 5 are fixedly connected to the filter assembly 6. The nut of the fastening screw 63 is located in the countersunk hole of the thick clamping ring 62. Initially, the valve core 3 and valve seat 2 are separated, and the medium is flowing. During the closing process, the valve core 3 and filter assembly 6 move downwards as a whole. The filter assembly 6 and push rods 5 enter the inner cavity of the valve seat 2. The end face of the thick clamping ring 62 first contacts and adheres to the surface of the limiting ring 8. There is a gap between the sealing part 4 and the valve seat 2. At this time, the medium flowing from bottom to top flows through the filter screen 61 and is filtered. Subsequently, the medium flows between the sealing part 4 and the valve seat 2. As the valve core 3 continues to move downwards, the filter assembly 6 remains in contact with the limiting ring 8, the spring 7 is compressed, and the four push rods 5 gradually move towards their respective rods. As the valve core 3 moves within the orifice, the gap between the sealing part 4 and the valve seat 2 gradually decreases until the sealing part 4 and the valve seat 2 fit together to form a hard seal, and the valve core 3 stops moving. During the opening process, the valve core 3 moves away from the valve seat 2, the spring 7 gradually recovers its deformation and the filter assembly 6 remains in contact with the limit ring 8. The medium flows to the gap between the valve seat 2 and the valve core 3 after being filtered by the filter screen 61. As the spring 7 returns to its initial state and the valve core 3 continues to move upward, the filter assembly 6 separates from the limit ring 8. The medium flows through the inner cavity of the limit ring 8 and then flows to the port of the valve seat 2. Finally, the valve core 3 drives the filter assembly 6 to return to its initial state. Compared to existing technologies, this design avoids impurities getting trapped between the valve core 3 and the valve seat 2, effectively improving the fit between the valve core 3 and the valve seat 2, forming a stable seal, and reducing the damage of impurities to the sealing part 4. During the opening and closing stages, the filter screen 61 plays a certain throttling role on the medium, thereby reducing the subsequent scouring force of the medium on the valve seat 2 and the valve core 3, effectively ensuring the structural stability of the valve core 3 and the valve seat 2. The design of passing the fastening screw 63 through the filter screen 61 and clamping the filter screen 61 with the clamping ring 62, compared to the design of clamping the filter screen 61 only by the clamping ring 62, can effectively improve the structural stability of the filter screen 61 and the connection stability between the filter screen 61 and the clamping ring 62, and prevent the filter screen 61 from easily shrinking towards the center of the clamping ring 62 due to the impact of the medium, thus preventing the edge of the filter screen 61 from coming out of the clamping ring 62.

[0013] As one specific implementation method of the improvement, refer to Figure 2 and Figure 3As shown, the inner cavity of the limiting ring 8 is frustoconical with its larger end facing the valve core 3. The larger diameter of the clamping ring 62 is between the diameters of the two ends of the inner cavity of the limiting ring 8. During the closing process, the clamping ring 62 enters the inner cavity of the limiting ring 8, and the edge of the clamping ring 62 contacts and slides against the inner wall of the limiting ring 8 until the edge of the end face of the clamping ring 62 is in complete contact with the inner wall of the limiting ring 8. Then the filter assembly 6 stops moving downward. Compared with the previous embodiment, which uses the end face of the clamping ring 62 to fit against the end face of the limiting ring 8, this design can avoid impurities being trapped between the limiting ring 8 and the clamping ring 62, resulting in insufficient contact between the limiting ring 8 and the clamping ring 62. This indirectly improves the sealing performance between the clamping ring 62 and the limiting ring 8, ensuring that the medium can only flow through the filter screen 61 and reach the sealing part 4, thus improving the filtration effect. Furthermore, the sliding of the clamping ring 62 relative to the limiting ring 8 can correct the relative position of the clamping ring 62 and the limiting ring 8, improving the coaxiality of the clamping ring 62 and the limiting ring 8.

[0014] As one specific implementation method of the improvement, refer to Figure 2 , Figure 3 and Figure 5 As shown, depending on actual needs, if there is a concern that the spring 7 may easily fail after being soaked in the medium, a sealing element 9 can be added between the valve core 3 and the push rod 5. That is, a sealing element 9 that can be fitted over the push rod 5 is fixedly attached to the surface of the limit cover facing the valve core 3. The sealing element 9 can be a rubber ring or a rubber layer, etc. There is a gap between the outer wall of the end of the push rod 5 and the inner wall of the rod hole to allow air to flow at the top and bottom of the end during the movement of the push rod 5. This design can improve the sealing performance between the limit cover and the valve core 3 as well as between the push rod 5 and the limit cover, and extend the service life of the spring 7.

[0015] The above description is merely a preferred embodiment of this utility model. The protection scope of this utility model is not limited to the above embodiments. All technical solutions falling within the scope of this utility model's concept are protected. It should be noted that for those skilled in the art, any improvements and modifications made without departing from the principle of this utility model should also be considered within the protection scope of this utility model.

Claims

1. A shut-off valve with a filtering function, comprising a valve body (1), a valve seat (2) located within the valve body (1), and a valve core (3) capable of forming a hard seal with the valve seat (2), wherein the valve core (3) is provided with a sealing portion (4) coaxial with the valve core (3) and capable of tightly abutting the valve seat (2), characterized in that: The valve core (3) has multiple push rods (5) that can extend and retract relative to the valve core (3) and are located on the same circumference, a filter assembly (6) that is connected to one end of the multiple push rods (5), and springs (7) that correspond one-to-one with the multiple push rods (5) and push the corresponding push rods (5) toward the valve seat (2). The multiple springs (7) are all confined inside the valve core (3), and the ends of the multiple push rods (5) that are not connected to the filter assembly (6) are all confined inside the valve core (3). The multiple push rods (5) and the filter assembly (6) are coaxially arranged with the valve core (3). The maximum diameter of the filter assembly (6) and the diameter of the multiple push rods (5) are both smaller than the inner diameter of the valve seat (2). A limiting ring (8) is provided on the inner wall of the valve seat (2) and is coaxial with the valve seat (2) and can contact the filter assembly (6). The medium flows to the valve core (3) after being filtered by the filter assembly (6) through the contact between the filter assembly (6) and the limiting ring (8).

2. A shut-off valve with filtering function according to claim 1, characterized in that: The filter assembly (6) includes a filter screen (61), two clamping rings (62) that clamp the filter screen (61) together, and a plurality of fastening screws (63) that pass through the two clamping rings (62) and the filter screen (61) and are threaded to the corresponding push rods (5). The nuts of the plurality of fastening screws (63) are located in the clamping rings (62) away from the push rods (5).

3. A shut-off valve with filtering function according to claim 2, characterized in that: The inner cavity of the limiting ring (8) is frustum-shaped with its large end facing the valve core (3), and the large diameter of the clamping ring (62) is between the diameters of the two ends of the inner cavity of the limiting ring (8).

4. A shut-off valve with a filtering function according to claim 1, 2, or 3, characterized in that: A seal (9) is provided between the valve core (3) and the multiple push rods (5) to prevent the medium from entering the valve core (3).

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