stop valve plug

Abstract

The utility model belongs to water segregator technical field discloses a kind of stop valve spool, stop valve spool includes valve core body, mandrel and elastic seal cover, valve core body includes main body and top cover, main body is provided with assembly port, and top cover is detachably connected in assembly port;Mandrel is set in valve core body, one end of mandrel extends main body, the other end extends top cover, and mandrel can move along the axial direction of valve core body;The first end seal cover of elastic seal cover is located in the one end of mandrel extending main body, the second end of elastic seal cover is connected in main body, when mandrel moves along the axial direction of valve core body, it can drive elastic seal cover synchronous expansion and contraction.The stop valve spool can avoid the part originally located in valve core body during mandrel descending process, long-time exposure in water, to avoid mandrel periphery scale to cause sealing structure abrasion failure.

Description

Technical Field

[0001] This utility model relates to the field of water distributor technology, and in particular to a shut-off valve core. Background Technology

[0002] During heating operations, electrically driven shut-off valve cores are required (these valve cores are typically used in conjunction with corresponding actuators). Existing shut-off valve cores mainly consist of a hollow valve core body and a spindle that passes through the valve core body and can move axially along the valve core body. The lower end of the spindle extends out of the valve core body in a sealed fit; specifically, the lower end of the spindle is sealed to the valve core body via a sealing ring. During the heating season, the heating element (manifold) is in the normally open state. At this time, the sealing section where the spindle contacts the sealing ring is always within the valve core body.

[0003] During the non-heating season (6-8 months of the year), the heating element is normally closed. During this time, the spindle remains in a downward position, causing the sealing section, originally located inside the valve core, to be submerged in water and accumulate scale. When the heating is turned on again, the scaled sealing section returns to the valve core, wearing down the sealing ring and ultimately leading to water entering the valve core and damaging the shut-off valve core.

[0004] Therefore, there is an urgent need for a shut-off valve core to solve the above-mentioned technical problems. Utility Model Content

[0005] The purpose of this utility model is to provide a valve core for a shut-off valve, so as to avoid the original sealing section being exposed to water for a long time when the core is in a downward position, thereby avoiding scale buildup on the outer periphery of the core that could lead to seal failure.

[0006] To achieve this objective, the present invention adopts the following technical solution:

[0007] A shut-off valve core, characterized in that it comprises:

[0008] The valve core includes a main body and a top cover, wherein the main body is provided with an assembly port and the top cover is detachably connected to the assembly port;

[0009] A mandrel is disposed in the valve core body, one end of the mandrel extends out of the main body and the other end extends out of the top cover, and the mandrel can move along the axial direction of the valve core body;

[0010] An elastic sealing sleeve is provided at one end of the mandrel extending out of the main body, and at the other end of the elastic sealing sleeve is connected to the main body. When the mandrel moves axially along the valve core, it can drive the elastic sealing sleeve to extend and retract synchronously.

[0011] Preferably, the second end of the elastic sealing sleeve is engaged with the main body;

[0012] The first end of the elastic sealing sleeve is engaged with the mandrel.

[0013] Preferably, the main body is provided with an annular limiting groove at one end away from the top cover, and a first protrusion is provided on the inner wall of the limiting groove near its opening. The inner wall of the second end of the elastic sealing sleeve is provided with a second protrusion, and the second end is accommodated in the limiting groove, and the first protrusion and the second protrusion are engaged with each other.

[0014] Preferably, the first protrusion is provided with a guide slope on the side opposite to the top cover, and the second protrusion can slide into the limiting groove along the guide slope.

[0015] Preferably, the end of the main body away from the top cover is also provided with a narrowing ring, which is arranged around the limiting groove and can fasten the second protrusion to the limiting groove.

[0016] Preferably, the mandrel extending from the main body has a first groove, and the first end of the elastic sealing sleeve engages with the first groove.

[0017] Preferably, the elastic sealing sleeve includes an outer ring sleeve, an inner ring sleeve, and an annular connecting portion. The two ends of the annular connecting portion are respectively connected to one end of the outer ring sleeve and one end of the inner ring sleeve. The mandrel is movably inserted into the inner ring sleeve, and the end of the inner ring sleeve opposite to the annular connecting portion is the first end, and the end of the outer ring sleeve opposite to the annular connecting portion is the second end.

[0018] Preferably, when the elastic sealing sleeve is not stretched by the mandrel, the inner ring sleeve extends into the outer ring sleeve, and the end of the inner ring sleeve connected to the annular connecting part is not lower than the end of the outer ring sleeve connected to the annular connecting part, so that the annular connecting part bends and forms an arc-shaped protrusion in the direction away from the main body.

[0019] Preferably, the inner diameter of the inner ring is smaller than the outer diameter of the first groove, and the first end can be engaged with the first groove.

[0020] Preferably, at least one first seal is provided between the outer periphery of the mandrel and the inner periphery of the body; and / or

[0021] At least one second seal is provided between the outer periphery of the mandrel and the inner periphery of the top cover; and / or

[0022] At least one third seal is provided between the outer periphery of the top cover and the main body.

[0023] The beneficial effects of this utility model are:

[0024] The main body and top cover are detachably connected, facilitating the assembly of the mandrel. The two ends of the elastic sealing sleeve are connected to the mandrel and the main body respectively, and possess a certain degree of elasticity. Therefore, when the mandrel moves, it can stretch the elastic sealing sleeve, meaning the elastic sealing sleeve can expand and contract synchronously with the end of the mandrel extending from the main body. Thus, during the non-heating season, the mandrel is always in a downward position, which stretches the elastic sealing sleeve accordingly. This means the elastic sealing sleeve can isolate the portion of the mandrel extending from the valve core from water, effectively preventing scale buildup on the outer circumference of the mandrel that could enter the valve core, avoiding damage to the internal sealing structure of the valve core, and thus extending the valve core's service life. Attached Figure Description

[0025] Figure 1 This is an isometric view of the valve core of the shut-off valve provided by this utility model;

[0026] Figure 2 This is a cross-sectional view of the valve core of the shut-off valve provided by this utility model;

[0027] Figure 3 This is a schematic diagram of the valve core body provided by this utility model;

[0028] Figure 4 This is a schematic diagram of the structure of the elastic sealing sleeve provided by this utility model;

[0029] Figure 5 This is the structural intent of the mandrel provided by this utility model;

[0030] Figure 6 This is a partial cross-sectional view of the valve core of the shut-off valve provided by this utility model.

[0031] In the picture:

[0032] 10. Valve core body; 11. Main body; 111. Assembly port; 112. Limiting groove; 113. Guide slope; 114. Narrowing ring; 115. First sealing groove; 116. First protrusion; 12. Top cover; 121. Second sealing groove; 122. Third sealing groove;

[0033] 20. Mandrel; 21. First groove; 22. Second groove;

[0034] 30. Elastic sealing sleeve; 31. Second protrusion; 32. First end; 33. Through hole; 34. Outer ring sleeve; 35. Inner ring sleeve; 36. Annular connecting part;

[0035] 40. First sealing element;

[0036] 50. Second sealing element;

[0037] 60. Third sealing element;

[0038] 70. Elastic component; 71. Elastic element; 72. Spring sleeve; 73. Snap ring; 74. Pad;

[0039] 80. Sealing assembly; 81. Sealing gasket; 82. Metal gasket; 83. Snap-fit. Detailed Implementation

[0040] The present invention will now be described in further detail with reference to the accompanying drawings and embodiments. It should be understood that the specific embodiments described herein are merely illustrative of the present invention and not intended to limit it. Furthermore, it should be noted that, for ease of description, the accompanying drawings show only the parts relevant to the present invention, not the entire structure.

[0041] In the description of this utility model, unless otherwise explicitly specified and limited, the terms "connected," "linked," and "fixed" should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral part; they can refer to a mechanical connection or an electrical connection; they can refer to a direct connection or an indirect connection through an intermediate medium; they can refer to the internal communication of two components or the interaction between two components. Those skilled in the art can understand the specific meaning of the above terms in this utility model based on the specific circumstances.

[0042] In this invention, unless otherwise explicitly specified and limited, "above" or "below" the second feature can include direct contact between the first and second features, or contact between the first and second features through another feature between them. Furthermore, "above," "over," and "on top" of the second feature includes the first feature directly above or diagonally above the second feature, or simply indicates that the first feature is at a higher horizontal level than the second feature. "Below," "below," and "under" the second feature includes the first feature directly below or diagonally below the second feature, or simply indicates that the first feature is at a lower horizontal level than the second feature.

[0043] In the description of this embodiment, the terms "upper," "lower," "left," and "right," etc., refer to the orientation or positional relationship shown in the accompanying drawings. They are used only for ease of description and simplification of operation, and do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation. Therefore, they should not be construed as limitations on this utility model. In addition, the terms "first" and "second" are only used for distinction in description and have no special meaning.

[0044] This embodiment provides a shut-off valve core, such as... Figures 1-5The valve core shown includes a valve core body 10, a spindle 20, and an elastic sealing sleeve 30. The valve core body 10 includes a main body 11 and a top cover 12. The main body 11 is provided with an assembly port 111, and the top cover 12 is detachably connected to the assembly port 111. The spindle 20 is disposed inside the valve core body 10, with one end of the spindle 20 extending out of the main body 11 and the other end extending out of the top cover 12. The spindle 20 can move along the axial direction of the valve core body 10. The first end 32 of the elastic sealing sleeve 30 is sealed on the outer periphery of the end of the spindle 20 that extends out of the main body 11, and the second end of the elastic sealing sleeve 30 is connected to the main body 11. When the spindle 20 moves along the axial direction of the valve core body 10, it can drive the elastic sealing sleeve 30 to extend and retract synchronously.

[0045] The main body 11 and the top cover 12 are detachably connected, facilitating the assembly of the spindle 20. The two ends of the elastic sealing sleeve 30 are connected to the spindle 20 and the main body 11 respectively, and possess a certain degree of elasticity. Therefore, when the spindle 20 moves, it can stretch the elastic sealing sleeve 30, meaning the elastic sealing sleeve 30 can extend and retract synchronously with the end of the spindle 20 extending from the main body 11. Thus, during the non-heating season, the spindle 20 is always in a downward position, which can stretch the elastic sealing sleeve 30, effectively isolating the portion of the spindle 20 extending from the valve core body 10 from water. This effectively prevents scale buildup on the outer circumference of the portion of the spindle 20 that could enter the valve core body 10, avoiding damage to the internal sealing structure of the valve core body 10 and thus improving the service life of the valve core.

[0046] It should be noted that, as Figure 2 As shown, the main body 11 and the top cover 12 form an inner cavity, within which an elastic component 70 is installed. The elastic component 70 enables the spindle 20 to tend to move along the axis of the valve core 10 away from the elastic sealing sleeve 30. That is, under no force, the elastic component 70 can reduce the descent speed of the spindle 20. When the heating system is started, the spindle 20 moves in accordance with the elastic component 70, thus enabling normal heating.

[0047] It is worth noting that the elastic sealing sleeve 30 is made of elastic material, and the hardness of the elastic sealing sleeve 30 is between 50A and 55A (Shore hardness). Moreover, in this embodiment, the elastic sealing sleeve 30 is made of VMQ (methyl vinyl silicone rubber, a special silicone rubber), which is not only resistant to high and low temperatures, has good insulation, and is chemically stable, so it is not easily corroded in water. In addition, the elastic material with a hardness in the range of 50A-55A can not only undergo elastic deformation, but also has a certain toughness, can withstand greater tensile force, and can ensure good performance.

[0048] In addition, such as Figure 2As shown, the elastic component 70 includes an elastic element 71, a spring sleeve 72, a retaining ring 73, and a pad 74. The spindle 20, located inside the valve core 10, has a second groove 22. The retaining ring 73 is engaged within the second groove 22, and its diameter is larger than that of the spindle 20. During assembly, the pad 74 is positioned at the bottom of the main body 11, the bottom of the spring sleeve 72 abuts against the pad 74, and the outer periphery of the spring sleeve 72 abuts against the inner wall of the main body 11. When the top cover 12 is installed at the assembly port 111, its bottom end can press against the top of the spring sleeve 72 to secure it. The elastic element 71 is sleeved around the outer periphery of the spindle 20 and located inside the spring sleeve 72 (the spindle 20 can pass through the pad 74). One end of the elastic element 71 abuts against the retaining ring 73, and the other end abuts against the top of the pad 74. This arrangement not only simplifies the overall structure of the elastic component 70, but also allows the elastic element 71 and the retaining ring 73 to provide a vertically upward elastic force to the spindle 20. The spring sleeve 72 can isolate the elastic element 71 from the valve core 10, thereby improving stability and preventing wear between the elastic element 71 and the valve core 10.

[0049] In this embodiment, the elastic element 71 is a spring. Springs are not only simple in structure, but also inexpensive, easy to install and use, which helps to reduce manufacturing costs and operational difficulties.

[0050] Furthermore, the top cover 12 is threaded into the assembly port 111 of the main body 11. The threaded engagement not only facilitates installation and improves installation speed, but also allows for easy unscrewing of the top cover 12 when internal parts need to be replaced. Moreover, the top cover 12 can firmly fix the spring sleeve 72 to the inner cavity of the valve core body 10, ensuring the stability of the spring sleeve 72.

[0051] To improve the ease of installation of the elastic sealing sleeve 30, the second end of the elastic sealing sleeve 30 is interlocked with the main body 11; simultaneously, the first end 32 of the elastic sealing sleeve 30 is interlocked with the spindle 20. This interlocking mechanism not only facilitates installation and provides good fixation, but also achieves a good sealing effect, effectively preventing water from entering.

[0052] Specifically, such as Figures 2-4As shown, the main body 11 has an annular limiting groove 112 at one end away from the top cover 12. A first protrusion 116 is provided on the inner wall of the limiting groove 112 near its opening. A second protrusion 31 is provided on the inner wall of the second end of the elastic sealing sleeve 30. The second end is accommodated in the limiting groove 112, and the first protrusion 116 and the second protrusion 31 are engaged with each other. This arrangement not only ensures a secure connection and simplifies the overall structure, but also improves the stability of the connection by having the first protrusion 116 and the second protrusion 31 engaged within the limiting groove 112. Furthermore, the annular limiting groove 112, the first protrusion 116, and the second protrusion 31 ensure uniform force distribution and prevent localized detachment.

[0053] To further improve assembly speed, such as Figure 3 As shown, a guide slope 113 is provided on the side of the first protrusion 116 facing away from the top cover 12, and the second protrusion 31 can slide into the limiting groove 112 along the guide slope 113. When assembly is required, simply push the elastic sealing sleeve 30 upward along the guide slope 113. Since the elastic sealing sleeve 30 has a certain deformation capacity, it can move and deform along the guide slope 113 until the second protrusion 31 enters the limiting groove 112. The elastic sealing sleeve 30 tightens under its own deformation capacity, thereby forming a snap-fit ​​engagement between the second protrusion 31 and the first protrusion 116 at the opening of the limiting groove 112 to complete the connection.

[0054] To further improve connection stability, such as Figure 1 , Figure 2 , Figure 3 as well as Figure 6 As shown, a necking ring 114 is also provided at the end of the main body 11 away from the top cover 12. The necking ring 114 is arranged around the limiting groove 112, and the necking ring 114 can fasten the second protrusion 31 to the limiting groove 112. When the second protrusion 31 of the elastic sealing sleeve 30 is engaged in the limiting groove 112, the necking ring 114 is subjected to a necking process (using mechanical force or hydraulic pressure generated by a mold or spinning tool to cause the material end to shrink radially inward, and the state of the necking ring 114 changes from...) Figure 2 become Figure 6 (as shown in the diagram), and then the edge of the constriction ring 114 secures the elastic sealing sleeve 30 to the outer peripheral wall between the first protrusion 116 and the guide slope 113, thus avoiding the problem that the second protrusion 31 easily falls out of the limiting groove 112 during the stretching of the elastic sealing sleeve 30.

[0055] like Figure 2 and Figure 5As shown, the end of the spindle 20 extending out of the main body 11 is provided with a first groove 21, and the first end 32 of the elastic sealing sleeve 30 is engaged with the first groove 21. When the second protrusion 31 is engaged in the limiting groove 112, the first end 32 can be engaged in the first groove 21, thereby realizing the simultaneous engagement of the elastic sealing sleeve 30 with the main body 11 and the spindle 20. The operation is simple and convenient, and the connection effect is good. The structure in which the first end 32 is engaged in the first groove 21 also provides a good sealing effect, which can effectively prevent water from entering the elastic sealing sleeve 30 and causing corrosion and scaling of the spindle 20, thus improving the service life of the valve core.

[0056] Specifically, such as Figure 4 As shown, the elastic sealing sleeve 30 includes an outer ring sleeve 34, an inner ring sleeve 35, and an annular connecting portion 36. The two ends of the annular connecting portion 36 are respectively connected to one end of the outer ring sleeve 34 and one end of the inner ring sleeve 35. The mandrel 20 is movably inserted into the inner ring sleeve 35, with the end of the inner ring sleeve 35 facing away from the annular connecting portion 36 being the first end 32, and the end of the outer ring sleeve 34 facing away from the annular connecting portion 36 being the second end. This arrangement not only simplifies the overall structure of the elastic sealing sleeve 30 but also facilitates processing, reducing manufacturing costs, and provides a good sealing effect. Furthermore, the inner ring sleeve 35 has a through hole 33 axially formed at its center. The end of the mandrel 20 extending out of the main body 11 can directly pass through the through hole 33 until the first end 32 is correspondingly engaged with the first groove 21 of the mandrel 20, thereby improving assembly convenience.

[0057] It should be noted that in this embodiment, the inner diameter of the inner ring sleeve 35, that is, the diameter of the through hole 33, is smaller than the outer diameter of the first groove 21, and the first end 32 of the inner ring sleeve 35 can engage with the first groove 21. Because the elastic sealing sleeve 30 is elastic, the inner ring sleeve 35 can deform during the assembly of the mandrel 20 to allow the mandrel 20 to pass through the through hole 33. When the first end 32 engages with the first groove 21, the inner ring sleeve 35 will be limited to its position within the first groove 21 by its own elastic force, thereby improving the stability of the connection between the elastic sealing sleeve 30 and the mandrel 20 and preventing the mandrel 20 from detaching from the elastic sealing sleeve 30 during vertical movement.

[0058] In addition, such as Figure 2 and Figure 4As shown, when the elastic sealing sleeve 30 is not stretched by the spindle 20, the inner ring sleeve 35 extends into the outer ring sleeve 34, and the end of the inner ring sleeve 35 connected to the annular connecting part 36 is not lower than the end of the outer ring sleeve 34 connected to the annular connecting part 36, so that the annular connecting part 36 bends and forms an arc-shaped protrusion in the direction away from the main body 11. The connection between the inner ring sleeve 35 and the outer ring sleeve 34 allows the annular connecting part 36 to bend and form an arc-shaped protrusion. The overall cross-sectional view of the entire elastic sealing sleeve 30 is an inverted "m" shape. Therefore, when the spindle 20 moves vertically downward, the first groove 21 drives the first end 32 to move downward in the vertical direction. At this time, the inner ring sleeve 35 will first drive the annular connecting part 36 to move. The curved annular connecting part 36 has sufficient expansion and contraction margin. Therefore, the inner ring sleeve 35 will first stretch the annular connecting part 36, thereby avoiding directly pulling the outer ring sleeve 34, thereby improving the stability of the connection between the outer ring sleeve 34 and the limiting groove 112, preventing the elastic sealing sleeve 30 from falling off the limiting groove 112, and thus ensuring the stability of the connection between the elastic sealing sleeve 30 and the main body 11.

[0059] To further improve the sealing effect, such as Figure 2 At least one first seal 40 is provided between the outer periphery of the mandrel 20 and the inner periphery of the body 11; and / or at least one second seal 50 is provided between the outer periphery of the mandrel 20 and the inner periphery of the top cover 12; and / or at least one third seal 60 is provided between the outer periphery of the top cover 12 and the body 11. The first seal 40 between the mandrel 20 and the body 11 prevents water from seeping into the inner cavity from the bottom end of the body 11; the second seal 50 between the mandrel 20 and the top cover 12 prevents water from seeping into the inner cavity from the top end of the top cover 12; and the third seal 60 between the outer periphery of the top cover 12 and the body 11 prevents water from entering the gap between the body 11 and the top cover 12, thereby ensuring that water will not corrode and damage the valve core from the inside.

[0060] It is worth noting that in this embodiment, a first sealing groove 115 is provided at the inner bottom of the main body 11, and two first sealing elements 40 are placed in the first sealing groove 115. When one of them is worn, the other can still play a good sealing role, preventing water from seeping in from the bottom of the main body 11. In addition, a second sealing groove 121 is provided on the inner circumference of the top cover 12, and a second sealing element 50 is placed in the second sealing groove 121. At the same time, a third sealing groove 122 is provided on the outer circumference of the top cover 12, and a third sealing element 60 is placed in the third sealing groove 122. This arrangement can provide multiple seals from the top and bottom of the valve core 10, as well as between the main body 11 and the top cover 12, to fully protect the valve core and improve its service life.

[0061] Furthermore, in this embodiment, the first sealing element 40, the second sealing element 50, and the third sealing element 60 are all O-rings. O-rings are inexpensive, easy to assemble, and have a good sealing effect. At the same time, the first sealing groove 115, the second sealing groove 121, and the third sealing groove 122 can respectively limit the corresponding O-rings, thereby preventing the O-rings from being dragged and displaced when the spindle 20 reciprocates, thus ensuring a good sealing effect.

[0062] Finally, it should be noted that, as Figure 1 and Figure 2 As shown, a sealing assembly 80 is designed on the outer periphery of one end of the spindle 20 that extends out of the valve core 10. The sealing assembly 80 includes a sealing gasket 81, a metal gasket 82, and a snap fastener 83. The metal gasket 82 is located above the sealing gasket 81, and the snap fastener 83 fixes the metal gasket 82 and the sealing gasket 81 to the outer periphery of the spindle 20. During the heating season, it can form a sealing fit with the external valve body structure to complete the heating work.

[0063] In summary, the valve core of the shut-off valve in this embodiment can prevent the part of the spindle 20 originally located inside the valve core body 10 from being exposed to water for a long time after the spindle 20 moves down, thereby preventing the first seal 40 from being worn and failing due to scale buildup on the outer periphery of the spindle 20, and improving the service life of the valve core.

[0064] Obviously, the above embodiments of this utility model are merely examples for clearly illustrating the present utility model, and are not intended to limit the implementation of the present utility model. Those skilled in the art can make various obvious changes, readjustments, and substitutions without departing from the protection scope of this utility model. It is neither necessary nor possible to exhaustively describe all embodiments here. Any modifications, equivalent substitutions, and improvements made within the spirit and principles of this utility model should be included within the protection scope of the claims of this utility model.

Claims

1. A shut-off valve core, characterized in that, include: The valve core (10) includes a main body (11) and a top cover (12). The main body (11) is provided with an assembly port (111), and the top cover (12) is detachably connected to the assembly port (111). A spindle (20) is disposed inside the valve core body (10). One end of the spindle (20) extends out of the main body (11), and the other end extends out of the top cover (12). The spindle (20) is capable of moving along the axial direction of the valve core body (10). The elastic sealing sleeve (30) has a first end (32) sealed on the end of the spindle (20) that extends out of the main body (11), and a second end of the elastic sealing sleeve (30) connected to the main body (11). When the spindle (20) moves along the axial direction of the valve core (10), it can drive the elastic sealing sleeve (30) to extend and retract synchronously.

2. The valve core of the shut-off valve according to claim 1, characterized in that, The second end of the elastic sealing sleeve (30) is engaged with the main body (11); The first end (32) of the elastic sealing sleeve (30) is engaged with the mandrel (20).

3. The valve core of the shut-off valve according to claim 2, characterized in that, The main body (11) is provided with an annular limiting groove (112) at one end away from the top cover (12). The inner wall of the limiting groove (112) is provided with a first protrusion (116) near its opening. The inner wall of the second end of the elastic sealing sleeve (30) is provided with a second protrusion (31). The second end is accommodated in the limiting groove (112), and the first protrusion (116) and the second protrusion (31) are engaged with each other.

4. The valve core of the shut-off valve according to claim 3, characterized in that, The first protrusion (116) has a guide slope (113) on the side away from the top cover (12), and the second protrusion (31) can slide into the limiting groove (112) along the guide slope (113).

5. The valve core of the shut-off valve according to claim 3, characterized in that, The main body (11) is provided with a constriction ring (114) at one end away from the top cover (12). The constriction ring (114) is arranged around the limiting groove (112) and can fasten the second protrusion (31) to the limiting groove (112).

6. The valve core of the shut-off valve according to claim 2, characterized in that, The spindle (20) has a first groove (21) at one end extending out of the main body (11), and the first end (32) of the elastic sealing sleeve (30) engages with the first groove (21).

7. The valve core of the shut-off valve according to claim 6, characterized in that, The elastic sealing sleeve (30) includes an outer ring sleeve (34), an inner ring sleeve (35), and an annular connecting part (36). The two ends of the annular connecting part (36) are respectively connected to one end of the outer ring sleeve (34) and one end of the inner ring sleeve (35). The mandrel (20) is movably inserted in the inner ring sleeve (35), and the end of the inner ring sleeve (35) facing away from the annular connecting part (36) is the first end (32), and the end of the outer ring sleeve (34) facing away from the annular connecting part (36) is the second end.

8. The valve core of the shut-off valve according to claim 7, characterized in that, When the elastic sealing sleeve (30) is not stretched by the spindle (20), the inner ring sleeve (35) extends into the outer ring sleeve (34), and the end of the inner ring sleeve (35) connected to the annular connecting part (36) is not lower than the end of the outer ring sleeve (34) connected to the annular connecting part (36), so that the annular connecting part (36) bends and forms an arc-shaped protrusion in the direction away from the main body (11).

9. The valve core of the shut-off valve according to claim 7, characterized in that, The inner diameter of the inner ring sleeve (35) is smaller than the outer diameter of the first groove (21), and the first end (32) can be engaged with the first groove (21).

10. The valve core of the shut-off valve according to any one of claims 1-6, characterized in that, At least one first seal (40) is provided between the outer periphery of the mandrel (20) and the inner periphery of the body (11); and / or At least one second seal (50) is provided between the outer periphery of the mandrel (20) and the inner periphery of the top cover (12); and / or At least one third seal (60) is provided between the outer periphery of the top cover (12) and the body (11).

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