Limiting piece for gate valve and gate valve

Abstract

The gate valve comprises a valve body and a valve element arranged in the valve body in a sliding mode, the valve body is provided with a valve port, the limiting piece is arranged in the valve element, the limiting piece is provided with an anti-vibration structure, at least part of the limiting piece protrudes out of the valve element, and the anti-vibration structure is arranged in the valve element. The inner side of the valve port is provided with an abutting face which impacts the limiting piece, and the limiting piece moves close to or away from the abutting face relative to the valve body through the valve element so as to close or open the valve port. The limiting piece collides with the abutting face and generates elastic deformation through the anti-vibration structure. According to the gate valve, the anti-vibration structure is arranged at the end, subjected to front impact, of the connecting part, the anti-vibration structure generates elastic deformation under the impact force, so that the buffering effect on the impact force is achieved, vibration and noise are reduced, and the limiting piece and the gate valve are protected advantageously.

Description

Technical Field

[0001] The present invention relates to the technical field of gate valves, and particularly relates to a limiting member for a gate valve and a gate valve. Background Art

[0002] In the vacuum industry, gate valves are mainly used in conjunction with vacuum equipment such as high vacuum pumps. Usually, the gate valve is installed between a vacuum chamber and a high vacuum pump, and the vacuum isolation between the vacuum pump and the vacuum chamber is controlled by controlling the opening and closing of the gate valve. Different vacuum states in the vacuum chamber can be achieved while keeping the vacuum pump group running continuously.

[0003] Existing gate valves mainly include a valve body and a valve core. The valve body is provided with a valve port, and the opening and closing of the gate valve are achieved by reciprocating movement of the valve core relative to the valve body to open or close the valve port. A limiting bar is provided inside the valve core. When the gate valve is closed, the position where the valve core closes the valve port is limited by the collision between the limiting bar and the valve body. During this process, an impact force is generated between the limiting bar and the valve body. Due to the poor vibration-proof performance of the limiting bar, a large amount of noise and vibration of the valve body are caused when the gate valve is closed. High-frequency impacts will cause damage to the limiting bar and the valve body, and affect the sealing degree between the valve core and the valve body. The vibration of the valve body may even cause damage and scrapping of the running vacuum pump.

[0004] The present invention is studied and proposed in view of the deficiencies of the existing technology. Summary of the Invention

[0005] In view of the problems that when the existing gate valve is closed, the vibration-proof performance of the limiting bar is poor, the limiting bar collides with the valve body to generate impact, resulting in a large amount of noise and vibration of the valve body, high-frequency impacts will cause damage to the limiting bar and the valve body, and affect the sealing degree between the valve core and the valve body, and the vibration of the valve body may even cause damage and scrapping of the running vacuum pump, the present invention provides a limiting member for a gate valve and a gate valve.

[0006] The technical solution adopted by the present invention to solve its technical problems is as follows: A limiting member for a gate valve includes a mounting portion and a connecting portion provided on one side of the mounting portion. The mounting portion is used for connecting the gate valve, and an anti-vibration structure is provided on the side of the connecting portion away from the mounting portion. The anti-vibration structure undergoes elastic deformation under the action of an impact force.

[0007] For the limiting member for a gate valve as described above, the anti-vibration structure includes a plurality of buffer holes. Each buffer hole penetrates the connecting portion along the thickness direction of the connecting portion, and the buffer holes are spaced apart along the length direction of the connecting portion.

[0008] For the limiting member for a gate valve as described above, the buffer holes extend along the width direction of the connecting portion.

[0009] A limiting member for a plug valve as described above, wherein the buffer hole at least includes a first buffer hole, the first buffer hole extends outward along the width direction of the connecting portion, and an open port communicating with the first buffer hole is provided on the side edge of the connecting portion.

[0010] A limiting member for a plug valve as described above, wherein the first buffer holes are provided on both sides of the connecting portion, and the first buffer holes on both sides are symmetrically arranged along the length direction of the connecting portion.

[0011] A limiting member for a plug valve as described above, wherein the buffer hole at least includes a second buffer hole, and the second buffer hole extends inward along the width direction of the connecting portion.

[0012] A limiting member for a plug valve as described above, wherein the second buffer hole is provided on one side of any one of the first buffer holes.

[0013] A limiting member for a plug valve as described above, along the length direction of the connecting portion, the width of the buffer hole is 0.5 - 4 mm.

[0014] A limiting member for a plug valve as described above, at least a part of the limiting member provided with the anti-vibration structure is made of spring steel.

[0015] On the other hand, the present invention also provides a plug valve, including a valve body, a valve core slidably arranged in the valve body, the valve body is provided with a valve port, the valve core is provided with a limiting member as described above, at least a part of the limiting member protrudes outside the valve core, and an abutting surface for impacting with the limiting member is provided inside the valve port; the limiting member moves relative to the valve body close to or away from the abutting surface through the valve core to close or open the valve port; the limiting member collides with the abutting surface and generates elastic deformation through the anti-vibration structure.

[0016] Compared with the prior art, the beneficial effects of the present invention are: 1. By arranging an anti-vibration structure at one end of the connecting portion that is subjected to a frontal impact, the anti-vibration structure generates elastic deformation under the impact force to achieve the buffering effect on the impact force, reduce vibration and noise, and is beneficial to protecting the limiting member and the plug valve.

[0017] 2. The manufacturer can directly improve the limiting member, greatly reducing the transformation cost of the plug valve.

[0018] 3. An anti-vibration structure of the limiting member is formed by a plurality of first buffer holes and a plurality of second buffer holes, which is beneficial to guiding the impact force received by the limiting member to disperse in a specific direction, avoiding the concentration of the impact force in a certain direction or local area of the limiting member, making the overall force on the valve core and the limiting member more uniform, and reducing the risk of damage to the limiting member caused by excessive local force; and each of the buffer holes can adapt to impact forces in different directions. When the limiting member is subjected to an axial impact force, the buffer hole can absorb energy by changing the force transmission path and causing shear deformation of the material around the hole; when the limiting member is subjected to a lateral impact force, the large-area edge buffering and force dispersion functions in the buffer hole can effectively reduce the impact of the impact force, enabling the limiting member to provide reliable elastic buffering under complex working environments and force conditions.

[0019] The present invention will be further described below in conjunction with the drawings and specific embodiments. BRIEF DESCRIPTION OF THE DRAWINGS

[0020] Figure 1 is a perspective view of the limiting member of the present invention; Figure 2 is a schematic diagram of one embodiment of the anti-vibration structure of the limiting member of the present invention; Figure 3 is a schematic diagram of a second embodiment of the anti-vibration structure of the limiting member of the present invention; Figure 4 is a schematic diagram of a third embodiment of the anti-vibration structure of the limiting member of the present invention; Figure 5 is a perspective view of the plug valve of the present invention when it is opened; Figure 6 is a perspective view of the plug valve of the present invention when it is closed; Figure 7 is an exploded view of the plug valve of the present invention; Figure 8 is an exploded view of the valve core of the plug valve of the present invention; Figure 9 is Figure 5 the A-A cross-sectional view in Figure 10 is Figure 6 the B-B cross-sectional view in DETAILED DESCRIPTION OF THE EMBODIMENTS

[0021] The embodiments of the present invention will be described in detail below with reference to the drawings. The described embodiments are only a part of the embodiments of the present invention, rather than all of the embodiments. All other embodiments obtained by those of ordinary skill in the art based on the embodiments of the present invention without making creative efforts fall within the scope of protection of the present invention.

[0022] It should be noted that all directional indications (such as up, down, left, right, front, back...) in the embodiments of the present invention are only used to explain the relative positional relationship, movement conditions, etc. between components in a certain specific posture (as shown in the attached drawings). If this specific posture changes, the directional indications will also change accordingly.

[0023] In addition, the descriptions involving "first", "second", etc. in the present invention are only for descriptive purposes and should not be construed as indicating or implying their relative importance or implicitly specifying the quantity of the indicated technical features. Thus, the features defined with "first" and "second" may explicitly or implicitly include at least one of such features. In addition, the technical solutions between various embodiments can be combined with each other, but it must be based on the ability of those of ordinary skill in the art to implement. When the combination of technical solutions results in contradictions or cannot be implemented, it should be considered that such a combination of technical solutions does not exist and is not within the protection scope required by the present invention.

[0024] Embodiment 1: As Figure 1 —4 shows, Figure 1 the Y, X, and Z directions in it respectively represent the length, width, and thickness directions of the connecting portion 12. It should be noted that, Figure 1 the arrows in the Y, X, and Z directions in it are only for reference and do not limit the actual extension directions of the connecting portion 12 in the length, width, and thickness directions.

[0025] The present invention provides a limit member 1 for a knife gate valve. The limit member 1 can be installed in the valve core 22 of the knife gate valve 2. When the knife gate valve 2 is closed, the valve core 22 moves relative to the valve body 21 through the driving device 23 and drives the limit member 1 to move toward the valve port 211 of the valve body 21, so that the valve core 22 closes the valve port 211 of the valve body 21. The closing position of the valve core 22 in the valve body 21 is limited by the limit member 1 to prevent the valve core 22 and the valve body 21 from directly colliding and being damaged, and to prevent noise and vibration from being generated inside the knife gate valve 2 due to the collision impact between the limit member 1 and the valve body 21. In order to protect the knife gate valve 2 and reduce noise and vibration, the present invention improves the limit member 1. Specifically, the limit member 1 includes a mounting portion 11 and a connecting portion 12 provided on one side of the mounting portion 11. The mounting portion 11 is used to connect the knife gate valve 2. The connecting portion 12 extends in a direction away from the mounting portion 11. An anti-vibration structure 13 is provided on the side of the connecting portion 12 away from the mounting portion 11. The anti-vibration structure 13 is arranged close to one end of the connecting portion 12 that is subjected to a frontal impact. The anti-vibration structure 13 undergoes elastic deformation under the impact force to achieve the buffering effect on the impact force, reduce vibration and noise, and is beneficial to protecting the limit member 1 and the knife gate valve 2; in addition, the manufacturer can directly improve the limit member 1, greatly reducing the transformation cost of the knife gate valve 2.

[0026] As shown Figure 1 in the figure, the anti-vibration structure 13 includes a plurality of buffer holes 131. Each of the buffer holes 131 penetrates the connecting portion 12 along the thickness direction of the connecting portion 12, and the buffer holes 131 are spaced apart along the length direction of the connecting portion 12. The buffer holes 131 are connected by the profile of the connecting portion 12, which helps to ensure the structural strength of the limiting member 1, so that the energy generated by the impact force is dispersed into the connecting profiles on the periphery of each buffer hole 131, reducing stress concentration and preventing the limiting member 1 from being continuously impacted and fractured. At the same time, the impact force received by the limiting member 1 can cause the anti-vibration structure 13 to undergo elastic deformation, so as to absorb the energy generated by the impact force and accumulate corresponding elastic potential energy. And after the collision ends, the elastic potential energy in the anti-vibration structure 13 is gradually released, so that the limiting member 1 returns to its original state or as close to its original state as possible, thereby realizing the buffering effect on the impact force; in addition, each of the buffer holes 131 penetrates the connecting portion 12 along the thickness direction of the connecting portion 12, so that air flow is formed in each buffer hole 131, which helps to consume the collision energy received by the limiting member 1, further reducing the impact of the impact force on the limiting member 1 and the valve body 21, and further improving the buffering effect. Optionally, along the length direction of the connecting portion 12, the total length of the anti-vibration structure 13 accounts for at least 1 / 2 of the middle length of the connecting portion.

[0027] Furthermore, as shown Figure 2 in the figure, the buffer hole 131 extends along the width direction of the connecting portion 12, which is beneficial to increasing the buffer area of the limiting member 1 in contact with the impact force, further reducing the stress concentration when the limiting member 1 is impacted, and preventing the limiting member 1 from deforming; and it provides a better elastic deformation space for the anti-vibration structure 13, further enhancing the elastic buffering ability of the limiting member 1; for example, the buffer hole 131 can be set as a kidney-shaped hole, that is, a long strip hole with semi-circular ends, and the hole between the two ends of the long strip hole is set as a straight hole, which is beneficial to guiding the impact force to disperse in a specific direction, avoiding the impact force concentrating in a certain direction or local area in the limiting member 1, making the overall force on the valve core 22 and the limiting member 1 more uniform, and reducing the risk of damage to the limiting member 1 caused by excessive local force; and the kidney-shaped hole can adapt to impact forces in different directions. When the limiting member 1 is subjected to an axial impact force, the kidney-shaped hole can absorb energy by changing the force transmission path and causing shear deformation of the material around the hole; when the limiting member 1 is subjected to a transverse impact force, the large-area edge buffering and force dispersion functions in the kidney-shaped hole can effectively reduce the impact of the impact force, so that the limiting member 1 can provide reliable elastic buffering under complex working environments and force conditions.

[0028] Furthermore, as shown Figure 2As shown, along the length direction of the connecting portion 12, the width W of the buffer hole 131 is 0.5 - 4 mm, which is beneficial for the limiting member 1 to adapt to impact forces of different magnitudes, achieving fine adjustment of the elastic deformation degree of the vibration prevention structure 13. For example, when the width of the buffer hole 131 is set to 0.5 mm, the profile on the periphery of the buffer hole 131 can produce relatively small deformation when subjected to an impact force. Since the space for the profile to deform into the hole is limited, the limiting member 1 can provide a relatively high stiffness, which is suitable for occasions with high requirements for the displacement accuracy of the limiting member 1 to prevent the valve core 22 from generating excessive displacement. When the width W of the buffer hole 131 is set to 4 mm, a larger deformation space is allowed for the profile, enabling the limiting member 1 to make more full use of the elasticity of the profile when subjected to an impact force, generating a larger deformation to absorb the impact energy, and can be used in scenarios that can withstand larger impact forces. Additionally, setting the width of the buffer hole 131 to 0.5 - 4 mm helps to maintain the strength of the limiting member 1 while ensuring the buffer performance of the vibration prevention structure 13, improving the reliability and service life of the limiting member 1. On the other hand, the interval width between the buffer holes can be equal to the width W of the buffer hole, or the interval width between the buffer holes is set to 1 - 4 mm to improve the structural strength of the limiting member.

[0029] In some other alternative embodiments, the width W of the buffer hole 131 is set to 0.5 - 1 mm. When the limiting member 1 is applied to the high-vacuum gate valve 2, the high-vacuum gate valve 2 generally cooperates with a high-vacuum pump. When the high-vacuum pump system is in a stable operating state, the pressure difference before and after the valve of the gate valve 2 is relatively small. The buffer hole 131 with a width of 0.5 - 1 mm is sufficient to handle the impact force under such working conditions. In such an environment, the momentum of the gas is relatively small, and the relatively narrow buffer hole 131 can undergo appropriate elastic deformation according to the actual magnitude of the impact force to absorb energy. For example, when a small number of gas molecules impact the valve core 22 in a high-vacuum environment, the buffer hole 131 can effectively disperse and absorb this part of the energy, preventing the valve core 22 from generating excessive vibration or displacement due to frequent minor impacts. Moreover, the high-vacuum pump system has very high requirements for cleanliness. The buffer hole 131 with a width of 0.5 - 1 mm can better block the entry of external particles and impurities, protecting the internal structure of the gate valve 2 and also reducing the risk of buffer performance failure caused by particle blockage of the buffer hole 131.

[0030] As Figure 2As shown, one specific implementation of the anti-vibration structure 13 is that the buffer hole 131 at least includes a first buffer hole 131a which extends outward along the width direction of the connecting portion 12, and an opening communicating with the first buffer hole 131a is provided at the side edge of the connecting portion 12; for example, the connecting portion 12 is provided with a kidney-shaped hole opening to the left and / or right, and along the length direction of the connecting portion 12, the first buffer holes 131a are equally spaced to further increase the elastic buffer area of the anti-vibration structure 13, disperse the impact force, reduce the stress concentration of the limiting member 1, and improve the buffer performance and service life of the limiting member 1; preferably, as Figure 2 shown, the first buffer holes 131a are provided on both sides of the connecting portion 12, and the first buffer holes 131a on both sides are symmetrically arranged along the length direction of the connecting portion 12 to ensure the buffer performance and structural strength of the limiting member 1.

[0031] As Figure 3 shown, another specific implementation of the anti-vibration structure 13 is that the buffer hole 131 at least includes a second buffer hole 131b which extends inward along the width direction of the connecting portion 12. For example, along the width direction of the connecting portion 12, the second buffer hole 131b is a closed kidney-shaped hole to further increase the elastic buffer area of the anti-vibration structure 13, disperse the impact force, reduce the stress concentration of the limiting member 1, and improve the buffer performance and service life of the limiting member 1; the second buffer holes 131b are equally spaced along the length direction of the connecting portion 12.

[0032] As Figure 4As shown in the figure, the third specific implementation manner of the anti-vibration structure 13 is that the buffer holes 131 include a first buffer hole 131a and a second buffer hole 131b. Along the width direction of the connecting portion 12, the first buffer hole 131a extends outward, and the second buffer hole 131b extends inward. The extending directions of the first buffer hole 131a and the second buffer hole 131b are opposite, and the second buffer hole 131b is provided on one side of any one of the first buffer holes 131a. For example, along the same width direction of the connecting portion 12, two first buffer holes 131a are symmetrically arranged along the length direction of the connecting portion 12, and second buffer holes 131b are spaced apart from the upper and lower sides of the first buffer holes 131a on both sides, thereby forming a group of anti-vibration structures S. Several groups of such anti-vibration structures 13 can be spaced along the length direction of the connecting portion 12. By simultaneously providing the first buffer hole 131a and the second buffer hole 131b in the limiting member 1, the elastic buffer area of the anti-vibration structure 13 is further increased, so that the limiting member 1 has more elastic deformation space, and the two buffer holes 131 can disperse the impact force in more different directions, further improving the buffer effect of the limiting member 1.

[0033] In some other alternative embodiments, at least a part of the anti-vibration structure 13 in the limiting member 1 is made of spring steel. The spring steel has a relatively high elastic modulus, which is 200 - 210 GPa. By using spring steel to make the anti-vibration structure 13, it can ensure that the anti-vibration structure 13 generates appropriate elastic deformation under the impact force, which is beneficial to storing and releasing energy. Optionally, the spring steel includes one of 65Mn, 60Si2MnA, and 50CrVA, and the spring steel is preferably set as 65Mn, so that the production and manufacturing of the limiting member 1 have higher economic benefits. Optionally, the limiting member 1 is an integrally formed structure, which is beneficial to improving the structural strength of the limiting member 1, extending the service life of the limiting member 1, simplifying the production process of the limiting member 1, and reducing the production cost of the flap valve 2.

[0034] Embodiment 2: As Figure 5 —10 shows, where Figure 5 and Figure 9 represent the open state of the flap valve 2, Figure 6 and Figure 10Indicating the closed state of the flap valve 2, the present invention also provides a flap valve 2, which includes a valve body 21 and a valve core 22 slidably disposed in the valve body 21. The valve body 21 is provided with a valve port 211. The valve core 22 is provided with the limiting member 1 as described above. At least a part of the limiting member 1 protrudes outside the valve core 22. An abutting surface 2111 that impacts the limiting member 1 is provided inside the valve port 211. The limiting member 1 moves relative to the valve body 21 closer to or away from the abutting surface 2111 through the valve core 22 to close or open the valve port 211. The limiting member 1 collides with the abutting surface 2111 and elastically deforms through the vibration-proof structure 13. For example, when closing the flap valve 2, the valve core 22 drives the limiting member 1 to move toward the valve port 211 until the end of the limiting member 1 contacts the abutting surface 2111 to close the valve port 211, and the vibration-proof structure 13 is elastically deformed by the impact force of the abutting surface 2111 to achieve buffering, reduce noise and vibration of the valve body 21, thereby protecting the flap valve 2 and the high vacuum pump.

[0035] As Figure 5 shown, the flap valve 2 further includes a driving device 23 connected to the valve core 22. The driving device 23 is disposed at the end of the valve body 21. The driving device 23 can be a cylinder driving device 23. The output shaft of the cylinder driving device 23 is fixedly connected to the valve core 22 to drive the valve core 22 to move back and forth relative to the valve body 21, thereby realizing opening or closing of the valve port 211.

[0036] As Figure 8As shown, the valve core 22 includes a front valve plate 221 and a rear valve plate 222 which are oppositely arranged. A receiving space is provided between the front valve plate 221 and the rear valve plate 222. A connecting frame 223 is arranged in the receiving space. The driving device 23 is connected to the connecting frame 223. The connecting frame 223 is provided with a hollow area 2231 which penetrates through it. The hollow area 2231 is communicated with the receiving space. Oppositely arranged first connecting plate 224 and second connecting plate 225 are arranged in the hollow area 2231. The limiting member 1 is connected to the bottom of the first connecting plate 224 through the mounting portion 11. The connecting portion 12 of the limiting member 1 extends to the outside of the valve core 22 and is opposite to the abutting surface 2111. A first mounting plate 226 is arranged between the first connecting plate 224 and the second connecting plate 225. A second mounting plate 227 is arranged on the other side of the second connecting plate 225. The second mounting plate 227, the first mounting plate 226 and the mounting portion 11 are connected by fasteners such as screws and bolts, so that the first connecting plate 224 and the second connecting plate 225 are connected. The connecting frame 223 is provided with a mounting surface 2232 at the bottom of the hollow area 2231. The mounting portion 11 abuts against the mounting surface 2232, and the connecting frame 223 is further provided with a relief hole 2233 for the connecting portion 12 to pass through; preferably, the limiting member 1 is set as a T-shaped connecting member. Further, the first connecting plate 224 and the front valve plate 221 are connected by fasteners such as screws and bolts. The second connecting plate 225 and the rear valve plate 222 are connected by a buffer structure. The buffer structure includes an elastic member arranged between the second connecting plate 225 and the rear valve plate 222, and a fixing member 2221 penetrating through the rear valve plate 222. The elastic member is sleeved on the fixing member 2221. In practical applications, when the plug valve 2 is closed, the driving device 23 drives the connecting frame 223 to move close to the abutting surface 2111, and drives the front valve plate 221 and the rear valve plate 222 to move through the connecting frame 223, so as to realize the overall movement of the valve core 22. The valve core 22 moves until the limiting member 1 abuts against the abutting surface 2111. The limiting member 1 receives an impact force and is buffered through the anti-vibration structure 13 and the buffer structure, so as to reduce noise and vibration of the valve body 21, thereby protecting the plug valve 2 and the high vacuum pump.

[0037] In some other alternative embodiments, such as Figure 8As shown, the connection frame 223 is provided with a ball buffer structure. The ball buffer structure is provided with a first ball 241 corresponding to the front valve plate 221 and a second ball 242 corresponding to the rear valve plate 222. Both the front valve plate 221 and the rear valve plate 222 are provided with ball grooves 243 corresponding to the first ball 241 / second ball 242, and a communicating groove 244 is further provided at the lower part of the ball groove 243. The inner diameter of the groove 244 is smaller than that of the ball groove 243; when the plug valve 2 is closed, the driving device 23 drives the connection frame 223 to move close to the abutting surface 2111, and drives the front valve plate 221 and the rear valve plate 222 to move synchronously through the connection frame 223, so as to realize the overall movement of the valve core 22. Each ball rolls with the movement of the valve core 22, and each ball moves relative to the front valve plate 221 and the rear valve plate 222 with the movement of the connection frame 223, so that the first ball 241 and the second ball 242 move between the corresponding ball grooves 243 and grooves 244, so as to further realize the buffering performance of the valve core 22 and reduce the noise and the vibration of the valve body 21 when the plug valve 2 is closed; preferably, a plurality of the ball buffer structures are provided, and each ball buffer structure is evenly distributed around the circumference of the connection frame 223. The ball grooves 243 and the grooves 244 in the front valve plate 221 and the rear valve plate 222 are arranged corresponding to each ball buffer structure.

[0038] In some other alternative embodiments, a sealing structure is provided on the circumferential side of the valve core 22. When the plug valve 2 is closed, the sealing structure is in close contact with the inner wall of the valve port 211, and the valve core 22 and the valve body 21 are sealed and connected through the sealing structure to ensure the airtightness when the plug valve 2 is closed.

[0039] The above only uses embodiments to further illustrate the technical content of the present invention, so as to make it easier for readers to understand, but it does not mean that the implementation manners of the present invention are limited to this. Any technical extension or re-creation made according to the present invention is protected by the present invention. The protection scope of the present invention is subject to the claims.

Claims

1. A stopper for a gate valve, characterized in that: The invention comprises a mounting portion (11) and a connecting portion (12) arranged on one side of the mounting portion (11); the mounting portion (11) is used to connect to a gate valve (2); a vibration-proof structure (13) is arranged on a side of the connecting portion (12) away from the mounting portion (11); the vibration-proof structure (13) is elastically deformed by an impact force.

2. A stopper for a gate valve according to claim 1, characterized in that: The anti-vibration structure (13) comprises a plurality of buffer holes (131), each of the buffer holes (131) penetrating the connecting portion (12) along the thickness direction of the connecting portion (12), and each of the buffer holes (131) is distributed at intervals along the length direction of the connecting portion (12).

3. A stopper for a gate valve according to claim 2, characterized in that: The buffer hole (131) extends along the width direction of the connecting portion (12).

4. A stopper for a gate valve as claimed in claim 3, characterized in that: The buffer hole (131) comprises at least a first buffer hole (131a), the first buffer hole (131a) extending outward along the width direction of the connecting portion (12), and a side edge of the connecting portion (12) is provided with an open opening communicating with the first buffer hole (131a).

5. A stopper for a gate valve as claimed in claim 4, characterized in that: The first buffer holes (131a) are provided on both sides of the connecting portion (12), and the first buffer holes (131a) on both sides are symmetrically arranged along the length direction of the connecting portion (12).

6. A stopper for a gate valve according to any one of claims 3 to 5, characterized in that: The buffer hole (131) comprises at least a second buffer hole (131b), and the second buffer hole (131b) extends inwardly along the width direction of the connecting portion (12).

7. A stopper for a gate valve according to claim 6, characterized in that: The second buffer hole (131b) is provided on one side of any one of the first buffer holes (131a).

8. A stopper for a gate valve according to claim 2, characterized in that: Along the length direction of the connecting portion (12), the width of the buffer hole (131) is 0.5 to 4 mm.

9. A stopper for a gate valve according to claim 1, characterized in that: At least the portion of the position-limiting member (1) on which the anti-vibration structure (13) is provided is made of spring steel.

10. A gate valve, characterized in that: The invention comprises a valve body (21), and a valve core (22) slidably arranged in the valve body (21), the valve body (21) being provided with a valve port (211), the valve core (22) being provided with a stopper (1) according to any one of claims 1 to 9, the stopper (1) at least partially protruding from the outside of the valve core (22), and the inner side of the valve port (211) being provided with a contact surface (2111) for impacting the stopper (1); The limiting member (1) moves closer to or farther from the abutting surface (2111) relative to the valve body (21) through the valve core (22), so as to close or open the valve port (211); The limiting member (1) collides with the abutment surface (2111) and generates elastic deformation through the anti-vibration structure (13).

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