Valve element 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 outer portion of the valve element, and the valve element is arranged in the valve port. 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] This utility model relates to the technical field of slide gate valves, and in particular to a valve core limiting component for slide gate valves and a slide gate valve. Background Technology

[0002] In the vacuum industry, slide gate valves are mainly used in conjunction with vacuum equipment such as high vacuum pumps. Typically, slide gate valves are installed between the vacuum chamber and the high vacuum pump. By controlling the opening and closing of the slide gate valve, the vacuum isolation between the vacuum pump and the vacuum chamber can be controlled. While maintaining the continuous operation of the vacuum pump unit, different vacuum states can also be achieved within the vacuum chamber.

[0003] Existing slide gate valves mainly consist of a valve body and a valve core. The valve body has a valve port, which is opened or closed by the reciprocating movement of the valve core relative to the valve body. The valve core has a limit stop bar. When the slide gate valve is closed, the limit stop bar collides with the valve body to limit the position of the valve core in closing the valve port. During this process, an impact force is generated between the limit stop bar and the valve body. Due to the poor vibration damping performance of the limit stop bar, the slide gate valve causes a lot of noise and valve body vibration when it is closed. High-frequency impacts can damage the limit stop bar and the valve body, and affect the sealing between the valve core and the valve body. Valve body vibration can even damage or scrap a vacuum pump that is in operation.

[0004] This utility model was proposed in response to the shortcomings of the existing technology. Utility Model Content

[0005] This invention addresses the aforementioned problems with existing slide gate valves, such as poor vibration damping performance of the limiting stop bar when closed, the collision and impact between the limiting stop bar and the valve body generating significant noise and valve body vibration, high-frequency impacts leading to damage to the limiting stop bar and valve body, affecting the sealing between the valve core and valve body, and even causing damage to and scrapping of the operating vacuum pump. The invention proposes a valve core limiting component for slide gate valves and a slide gate valve itself.

[0006] The technical solution adopted by this utility model to solve its technical problem is:

[0007] A valve core limiting component for a slide gate valve includes a mounting portion and a connecting portion disposed on one side of the mounting portion. The mounting portion is used to connect the slide gate valve. A vibration damping structure is provided on the side of the connecting portion away from the mounting portion. The vibration damping structure undergoes elastic deformation under impact force.

[0008] As described above, the valve core limiting component for a slide gate valve includes a vibration damping structure comprising a plurality of buffer holes, each buffer hole penetrating the connecting portion along the thickness direction of the connecting portion, and the buffer holes being spaced apart along the length direction of the connecting portion.

[0009] The buffer hole extends along the width direction of the connecting portion.

[0010] The buffer hole includes at least a first buffer hole extending outward along the width direction of the connecting portion, and the side edge of the connecting portion is provided with an opening communicating with the first buffer hole.

[0011] The first buffer holes on both sides of the connecting portion are symmetrically arranged along the length direction of the connecting portion.

[0012] The buffer hole includes at least a second buffer hole extending inward along the width direction of the connecting portion.

[0013] One side of any one of the first buffer holes is provided with the second buffer hole.

[0014] The width of the buffer hole along the length direction of the connecting portion is 0.5-4 mm.

[0015] At least part of the anti-vibration structure in the limiting member is made of spring steel.

[0016] In another aspect, the utility model also provides a plug-in valve, including valve body, the valve core that can be slidably arranged in the valve body, the valve body is equipped with valve port, the valve core is equipped with the limiting member as described above in, at least part of the limiting member projects in the outside of the valve core, the inboard of the valve port is equipped with the abutting surface with the limiting member produces impact, the limiting member is through the valve core relative to the valve body is close to or away from the abutting surface moves, to close or open the valve port, the limiting member collides with the abutting surface, and produces elastic deformation through the anti-vibration structure.

[0017] Compared with the prior art, the utility model has the beneficial effects that:

[0018] 1. By setting the anti-vibration structure on the end of the connecting portion subjected to frontal impact, the anti-vibration structure is elastically deformed under the impact force to achieve the buffering effect of the impact force, reduce vibration and noise, and be beneficial to protecting the limiting member and the plug-in valve.

[0019] 2. The manufacturer can directly improve the limiting member, which greatly reduces the modification cost of the plug-in valve.

[0020] 3、The anti-vibration structure of the limiting piece is formed by a plurality of first buffer holes and a plurality of second buffer holes, which is beneficial to guide the impact force borne by the limiting piece to be dispersed in a specific direction, avoid the impact force from being concentrated in a certain direction or a local area of the limiting piece, make the overall force borne by the valve core and the limiting piece more uniform, and reduce the damage risk of the limiting piece caused by excessive local force; and each buffer hole can adapt to impact force in different directions, when the limiting piece is subjected to 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 piece is subjected to transverse impact force, the large-area edge buffering and force dispersion function of the buffer hole can effectively reduce the impact of the impact force, so that the limiting piece can provide reliable elastic buffering in complex working environment and force condition.

[0021] The utility model will be further described below in combination with the drawings and specific embodiments. BRIEF DESCRIPTION OF DRAWINGS

[0022] Figure 1 It is the perspective view of the limiting piece of the utility model;

[0023] Figure 2 It is the schematic view of one of the anti-vibration structure embodiments of the limiting piece of the utility model;

[0024] Figure 3 It is the schematic view of the second anti-vibration structure embodiment of the limiting piece of the utility model;

[0025] Figure 4 It is the schematic view of the third anti-vibration structure embodiment of the limiting piece of the utility model;

[0026] Figure 5 It is the perspective view of the plug-in valve of the utility model when opening;

[0027] Figure 6 It is the perspective view of the plug-in valve of the utility model when closing;

[0028] Figure 7 It is the exploded view of the plug-in valve of the utility model;

[0029] Figure 8 It is the exploded view of the valve core of the plug-in valve of the utility model;

[0030] Figure 9 It is the A-A sectional view in Figure 5

[0031] It is the B-B sectional view in Figure 10 Figure 6 Specific embodiments

[0032] ​​The embodiments of the present application will be described in detail below with reference to the drawings. The described embodiments are only a part of the embodiments of the present application, rather than all the embodiments. Based on the embodiments of the present application, all other embodiments obtained by those skilled in the art without creative labor fall within the scope of the present application.

[0033] It should be noted that all directional indications, such as upper, lower, left, right, front, back, etc., described in the embodiments of the present application are only used to explain the relative position relationship, movement condition, etc. between components in a certain specific posture (as shown in the drawings), and if the specific posture changes, the directional indications also change accordingly.

[0034] In addition, the description of "first", "second" and the like in the present application is only for the purpose of description, and cannot be understood as indicating or implying the relative importance of the indicated technical features or implicitly indicating the number of the indicated technical features. Therefore, the features limited by "first", "second" can explicitly or implicitly include at least one of the features. In addition, the technical solutions of each embodiment can be combined with each other, but it must be based on the realization of ordinary skilled in the art, when the combination of technical solutions appears contradictory or unachievable, it should be considered that the combination of technical solutions does not exist, nor within the scope of protection required by the present application.

[0035] Embodiment 1:

[0036] As Figure 1 shown in FIG. 4, Figure 1 Y, X, Z directions in the connection part 12 respectively represent the length, width and thickness directions, it should be noted that, Figure 1 Y, X, Z direction arrows in the connection part 12 are only for reference, and do not limit the actual extension direction of the connection part 12 in the length, width and thickness directions.

[0037] The utility model provides a kind of plug valve with valve core limiting piece 1, the limiting piece 1 can be installed in the valve core 22 of plug valve 2, when closing plug valve 2, valve core 22 is moved relative to valve body 21 by driving device 23, and limiting piece 1 is moved to the valve port 211 direction of valve body 21, to make valve core 22 close valve port 211 of valve body 21, limiting piece 1 is defined the closed position of valve core 22 in valve body 21, to prevent valve core 22 and valve body 21 from being damaged by direct collision, since the impact between limiting piece 1 and valve body 21 causes noise and vibration in the inside of plug valve 2, in order to protect plug valve 2, reduce noise and vibration, the utility model improves limiting piece 1, specifically, limiting piece 1 includes installation part 11, the connecting portion 12 of one side of installation part 11, installation part 11 is used to connect plug valve 2, connecting portion 12 extends to the direction away from installation part 11, the side of connecting portion 12 away from installation part 11 is equipped with anti-vibration structure 13, anti-vibration structure 13 is close to the end of connecting portion 12 impacted by front, anti-vibration structure 13 is elastically deformed by impact force, to realize the buffering effect of impact force, reduce vibration and noise, it is favorable to protect limiting piece 1 and plug valve 2;In addition, manufacturer can directly improve limiting piece 1, greatly reduce the transformation cost of plug valve 2.

[0038] As Figure 1 As shown in the figure, the anti-vibration structure 13 includes a plurality of buffer holes 131, each buffer hole 131 penetrates the connecting portion 12 along the thickness direction of the connecting portion 12, and each buffer hole 131 is distributed along the length direction of the connecting portion 12, and each buffer hole 131 is connected by the profile of the connecting portion 12, so as to ensure the structural strength of the limiting piece 1, disperse the energy generated by the impact force to the connecting profile around each buffer hole 131, reduce stress concentration, avoid the limiting piece 1 from being broken by continuous impact, at the same time, the impact force received by the limiting piece 1 can cause the elastic deformation of the anti-vibration structure 13, to absorb the energy generated by the impact force and accumulate the corresponding elastic potential energy, and after the impact ends, the elastic potential energy in the anti-vibration structure 13 is gradually released, so that the limiting piece 1 returns to its original state or as close to the original state as possible, thereby realizing the buffering effect of the impact force; in addition, each buffer hole 131 penetrates the connecting portion 12 along the thickness direction of the connecting portion 12, so that air flows in each buffer hole 131, to consume the impact energy received by the limiting piece 1, further reduce the influence of the impact force on the limiting piece 1 and the valve body 21, and further improve the buffering effect. Optionally, the total length of the anti-vibration structure 13 along the length direction of the connecting portion 12 is at least half of the length of the connecting portion.

[0039] Further, asFigure 2 As shown, the buffer hole 131 extends along the width direction of the connecting portion 12, which is beneficial to increase the buffer area of the limiting piece 1 in contact with the impact force, further reduce the stress concentration of the limiting piece 1 when impacted, and prevent the limiting piece 1 from deforming; and provides a better elastic deformation space for the anti-vibration structure 13, further improving the elastic buffer capacity of the limiting piece 1; for example, the buffer hole 131 can be provided as a waist-shaped hole, i.e. a long strip-shaped hole with semicircular ends, and a straight hole between the two ends, which is beneficial to guide the impact force to disperse in a specific direction, avoiding the impact force from concentrating in a certain direction or local area of the limiting piece 1, so that the overall force of the spool 22 and the limiting piece 1 is more uniform, reducing the risk of damage to the limiting piece 1 due to excessive local stress; and the waist-shaped hole can adapt to impact forces in different directions, when the limiting piece 1 is subjected to an axial impact force, the waist-shaped hole can absorb energy by changing the force transmission path and causing shear deformation of the material around the hole; when the limiting piece 1 is subjected to a transverse impact force, the large-area edge buffer and force dispersion function of the waist-shaped hole can effectively reduce the impact of the impact force, so that the limiting piece 1 can provide reliable elastic buffering in complex working environments and stress conditions.

[0040] Further, as shown in Figure 2 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 to the limiting piece 1 to adapt to different sizes of impact forces, and to realize fine adjustment of the elastic deformation degree of the anti-vibration structure 13; for example, when the width of the buffer hole 131 is 0.5 mm, the profile around the buffer hole 131 can produce relatively small deformation when subjected to an impact force, and since the deformation space of the profile into the hole is limited, the limiting piece 1 can provide higher stiffness, which is suitable for occasions with high displacement precision requirements for the limiting piece 1, preventing excessive displacement of the spool 22; when the width W of the buffer hole 131 is 4 mm, the profile has a larger deformation space, so that the limiting piece 1 can make full use of the elasticity of the profile to produce larger deformation to absorb impact energy when subjected to an impact force, which can be used in scenarios that bear larger impact forces. In addition, setting the width of the buffer hole 131 to 0.5-4 mm can help maintain the strength of the limiting piece 1 while ensuring the buffer performance of the anti-vibration structure 13, improving the reliability and service life of the limiting piece 1. On the other hand, the spacing width between each buffer hole can be equal to the width W of the buffer hole, or the spacing width between each buffer hole is set to 1-4 mm, to improve the structural strength of the limiting piece.

[0041] In some other optional embodiments, the width W of the buffer hole 131 is set to 0.5-1 mm; when the limiting piece 1 is applied to a high-vacuum plug valve 2, the high-vacuum plug valve 2 is generally used in cooperation with a high-vacuum pump, and when the high-vacuum pump system is in a stable running state, the pressure difference before and after the plug valve 2 is relatively small, and the 0.5-1 mm wide buffer hole 131 is sufficient to cope with the impact force under this working condition. In such an environment, the momentum of the gas is relatively small, and the relatively narrow buffer hole 131 can be elastically deformed to absorb energy according to the actual impact force. For example, when a small amount of gas molecules collide with the valve core 22 in a high-vacuum environment, the buffer hole 131 can effectively disperse and absorb this part of the energy, avoiding excessive vibration or displacement of the valve core 22 due to frequent micro-impacts. Moreover, the high-vacuum pump system has a high requirement for cleanliness, and the 0.5-1 mm wide buffer hole 131 can better block the entry of external particles and impurities, protecting the internal structure of the plug valve 2, while also reducing the risk of buffer performance failure due to particle blockage of the buffer hole 131.

[0042] As shown in Figure 2 , one of the specific embodiments 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 the side edge of the connecting portion 12 is provided with an open port in communication with the first buffer hole 131a; for example, the connecting portion 12 is provided with a waist-shaped hole open to the left and / or right side, and along the length direction of the connecting portion 12, each first buffer hole 131a is distributed at equal intervals, so as to further increase the elastic buffer area of the anti-vibration structure 13, disperse the impact force, reduce stress concentration of the limiting piece 1, and improve the buffer performance and service life of the limiting piece 1. Figure 2

[0043] As shown in Figure 3 , another specific embodiment 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 waist-shaped hole, so as to further increase the elastic buffer area of the anti-vibration structure 13, disperse the impact force, reduce stress concentration of the limiting piece 1, and improve the buffer performance and service life of the limiting piece 1; each second buffer hole 131b is distributed at equal intervals along the length direction of the connecting portion 12.

[0044] As shown in Figure 4 ​As shown, the third embodiment of the anti-vibration structure 13 is that the buffer hole 131 includes a first buffer hole 131a and a second buffer hole 131b, the first buffer hole 131a extends outward along the width direction of the connecting part 12, 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 one side of any first buffer hole 131a is provided with the second buffer hole 131b; for example, along the same width direction of the connecting part 12, the connecting part 12 is symmetrically provided with two first buffer holes 131a along the length direction, and the upper and lower sides of the first buffer holes 131a on both sides are spaced apart to form a vibration-proof structure group S, and the vibration-proof structure 13 group can be spaced apart along the length direction of the connecting part 12; by simultaneously providing the first buffer hole 131a and the second buffer hole 131b in the limiting part 1, the elastic buffer area of the anti-vibration structure 13 is further increased, the limiting part 1 has more elastic deformation space, and the two kinds of buffer holes 131 can disperse the impact force in more different directions, further improving the buffering effect of the limiting part 1.

[0045] In other optional embodiments, at least part of the anti-vibration structure 13 in the limiting part 1 is made of spring steel, the spring steel has a high elastic modulus of 200-210 GPa, and the spring steel is used to make the anti-vibration structure 13, which can ensure that the anti-vibration structure 13 has appropriate elastic deformation under impact force, which is beneficial to store and release energy; optionally, the spring steel includes one of 65Mn, 60Si2MnA, and 50CrVA, and the spring steel is preferably 65Mn, which makes the production and manufacturing of the limiting part 1 have higher economic benefits. Optionally, the limiting part 1 is an integral structure, which is beneficial to improve the structural strength of the limiting part 1, prolong the service life of the limiting part 1, simplify the production process of the limiting part 1, and reduce the production cost of the plug valve 2.

[0046] Embodiment 2:

[0047] As Figure 5 shown in FIG. 10, wherein Figure 5 and Figure 9 represent the open state of the plug valve 2, Figure 6 and Figure 10The utility model discloses a limit piece 1 is arranged in the valve core 22 of plug valve 2, and the limit piece 1 is arranged in the valve core 22 and is partially protruding from the valve core 22, and the limit piece 1 is moved to the abutting face 2111 of valve port 211 through the valve core 22 relative to the valve body 21 to close or open valve port 211, and the limit piece 1 is collided with the abutting face 2111 and is deformed elastically through the anti-vibration structure 13, for example, when closing plug valve 2, the limit piece 1 is moved to the direction of valve port 211 through the valve core 22, and the end of limit piece 1 is contacted with the abutting face 2111 to close valve port 211, and the anti-vibration structure 13 is deformed elastically through the impact force of abutting face 2111 to realize buffering, reduce noise and the vibration of valve body 21, thereby protecting plug valve 2 and high vacuum pump.

[0048] As Figure 5 The utility model discloses a limit piece 1 is arranged in the valve core 22 of plug valve 2, and the limit piece 1 is arranged in the valve core 22 and is partially protruding from the valve core 22, and the limit piece 1 is moved to the abutting face 2111 of valve port 211 through the valve core 22 relative to the valve body 21 to close or open valve port 211, and the limit piece 1 is collided with the abutting face 2111 and is deformed elastically through the anti-vibration structure 13, for example, when closing plug valve 2, the limit piece 1 is moved to the direction of valve port 211 through the valve core 22, and the end of limit piece 1 is contacted with the abutting face 2111 to close valve port 211, and the anti-vibration structure 13 is deformed elastically through the impact force of abutting face 2111 to realize buffering, reduce noise and the vibration of valve body 21, thereby protecting plug valve 2 and high vacuum pump.

[0049] As Figure 8As shown, the valve core 22 comprises a front valve plate 221 and a rear valve plate 222 arranged oppositely, and a receiving space is arranged 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 with the connecting frame 223, the connecting frame 223 is provided with a hollow area 2231, the hollow area 2231 communicates with the receiving space, a first connecting plate 224 and a second connecting plate 225 are arranged oppositely in the hollow area 2231, the limiting piece 1 is connected to the bottom of the first connecting plate 224 through the mounting portion 11, the connecting portion 12 of the limiting piece 1 extends to the outside of the valve core 22 and is opposite to the abutting face 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 through fasteners such as screws and bolts to connect the first connecting plate 224 and the second connecting plate 225, the connecting frame 223 is provided with a mounting face 2232 at the bottom of the hollow area 2231, the mounting portion 11 abuts against the mounting face 2232, and the connecting frame 223 is further provided with a clearance hole 2233 through which the connecting portion 12 passes; preferably, the limiting piece 1 is a T-shaped connecting piece. Further, the first connecting plate 224 is connected with the front valve plate 221 through fasteners such as screws and bolts, the second connecting plate 225 is connected with the rear valve plate 222 through a buffer structure, the buffer structure comprises an elastic piece arranged between the second connecting plate 225 and the rear valve plate 222, a fixing piece 2221 penetrating through the rear valve plate 222, and the elastic piece is sleeved on the fixing piece 2221. In actual application, when the plug valve 2 is closed, the connecting frame 223 is driven by the driving device 23 to move close to the abutting face 2111, and the front valve plate 221 and the rear valve plate 222 are driven by the connecting frame 223 to move, so as to realize the overall movement of the valve core 22, the valve core 22 moves to abut against the limiting piece 1 and the abutting face 2111, the limiting piece 1 is impacted and 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.

[0050] In other optional embodiments, as Figure 8As shown, the connecting 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, the front valve plate 221 and the rear valve plate 222 are both provided with a ball groove 243 corresponding to the first ball 241 / second ball 242, and the lower part of the ball groove 243 is further provided with a communicating groove 244, 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 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 synchronously through the connecting 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 connecting frame 223, so that the first ball 241 and the second ball 242 move between the corresponding ball groove 243 and the groove 244, so as to further realize the buffering performance of the valve core 22, reduce the noise and vibration of the valve body 21 when the plug valve 2 is closed; preferably, the ball buffer structure is provided with a plurality of ball buffer structures, each ball buffer structure is uniformly distributed around the circumference of the connecting frame 223, and the ball groove 243 and the groove 244 in the front valve plate 221 and the rear valve plate 222 are arranged corresponding to each ball buffer structure.

[0051] In some optional embodiments, the valve core 22 is provided with a sealing structure on the side, 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 sealing structure is connected between the valve core 22 and the valve body 21, so as to guarantee the air tightness when the plug valve 2 is closed.

[0052] The above is only to further illustrate the technical content of the present application by way of examples, so that the reader can more easily understand, but it does not mean that the embodiments of the present application are limited to this, any technical extension or re-creation made according to the present application is also protected by the present application. The protection scope of the present application is subject to the claims.

Claims

1. A valve core limiting member for a plug valve, characterized by, The device comprises a mounting part (11), a connecting part (12) arranged on one side of the mounting part (11), the mounting part (11) is used for connecting a plug valve (2), the connecting part (12) is provided with an anti-vibration structure (13) on the side away from the mounting part (11), and the anti-vibration structure (13) is elastically deformed under impact force.

2. The valve core limiting piece for plug-in valve according to claim 1, characterized in that, The anti-vibration structure (13) comprises a plurality of buffer holes (131), each buffer hole (131) penetrates the connecting part (12) along the thickness direction of the connecting part (12), and each buffer hole (131) is distributed along the length direction of the connecting part (12).

3. The valve core limiting piece for plug-in valve as claimed in claim 2, characterized in that, The buffer hole (131) extends along the width direction of the connecting part (12).

4. The valve core limiting piece for plug-in 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) extends outward along the width direction of the connecting part (12), and the side edge of the connecting part (12) is provided with an open port communicated with the first buffer hole (131a).

5. The valve core limiting member for plug valve as claimed in claim 4, characterized in that, The connecting part (12) is provided with the first buffer hole (131a) on both sides, and the first buffer holes (131a) on both sides are symmetrically arranged along the length direction of the connecting part (12).

6. A valve core positioner for a plug valve as claimed in claim 4 or 5, characterized in that The buffer hole (131) comprises at least a second buffer hole (131b), and the second buffer hole (131b) extends inward along the width direction of the connecting part (12).

7. The valve core limiting member for plug valve as claimed in claim 6, characterized in that, One side of any one of the first buffer holes (131a) is provided with the second buffer hole (131b).

8. The valve core limiting piece for plug-in valve as claimed in claim 2, characterized in that, The width of the buffer hole (131) along the length direction of the connecting part (12) is 0.5-4 mm.

9. The valve core limiting member for plug valve as claimed in claim 1, wherein, At least part of the anti-vibration structure (13) in the limiting part (1) is made of spring steel.

10. A plug valve characterized by, The device comprises a valve body (21) and a valve core (22) slidably arranged 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 part (1) as claimed in any one of claims 1-9, at least part of the limiting part (1) protrudes outside the valve core (22), and the inner side of the valve port (211) is provided with an abutting surface (2111) for impacting the limiting part (1); The limiting part (1) is moved close to or away 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 part (1) collides with the abutting surface (2111) and is elastically deformed through the anti-vibration structure (13).

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