Straight-through valve with speed reduction driving mechanism

Abstract

The invention relates to a straight-through valve with a speed reduction driving mechanism, and belongs to the technical field of straight-through valve driving mechanisms, the straight-through valve with the speed reduction driving mechanism comprises a valve seat and a driving piece, the driving mechanism comprises a driving cavity, a valve rod assembly and the driving piece, the driving cavity is internally provided with speed reduction liquid, and a valve is arranged at one end of the valve rod assembly; the valve rod assembly is arranged in the flow channel and can be driven by the driving part to move and cut off fluid in the flow channel and extrude the speed reducing liquid, and the speed reducing liquid generates damping to the valve rod assembly after being extruded and drives the detection device to act at the same time. The deceleration liquid is arranged in the driving cavity, when the driving piece drives the valve at one end of the valve rod assembly to move and cut off fluid in the flow channel, the deceleration liquid can be synchronously extruded, impact generated when the stroke tail end of the valve makes contact with the valve seat is buffered through damping generated when the deceleration liquid is extruded, and meanwhile when the deceleration liquid is extruded, the valve is prevented from being damaged. The detection device can be driven to act, and the sealing performance of the sealing element in the device can be judged by observing the detection device.

Description

Technical Field

[0001] The present application relates to the technical field of through-valve drive mechanisms, and in particular to a through-valve with a speed reduction drive mechanism. Background Art

[0002] A straight-through valve is a common fluid control device. Its main function is to control the on and off of the fluid and adjust the flow rate. The inlet and outlet axes of the straight-through valve coincide or are parallel to each other. The straight-through valve relies on the valve stem pressure to make the valve disc sealing surface tightly combined with the valve seat sealing surface to prevent the flow of medium.

[0003] Existing through-valve is widely used in various industrial fields, such as petrochemical, electric power, metallurgy, shipbuilding, aerospace, etc. The driving mechanism of the electric through-valve is mainly controlled by the electric actuator to control the action of the motor. The motor drives the valve to move through the reducer and the connecting rod device. The valve can block the inlet and outlet of the through-valve or adjust the fluid flow.

[0004] When the existing electric through-valve controls the valve action, the valve moves back and forth up and down inside the valve body under the control of the controller. When the valve blocks the inlet and outlet of the through-valve and moves to the end of the stroke, the valve will produce a rigid impact on the valve seat. After long-term use, the reaction force generated by the impact will damage the internal drive structure, and will also damage the valve seat, valve stem and valve. Summary of the invention

[0005] The present application provides a through valve with a deceleration drive mechanism, which can solve the problem that when the existing valve blocks the through valve, the valve seat of the through valve has a large impact, thereby damaging the drive mechanism and the through valve.

[0006] The technical solution of the present application is as follows: A through valve with a deceleration drive mechanism, comprising: A valve seat, wherein a flow channel is provided inside the valve seat and runs through the valve seat, wherein the flow channel extends in a lateral direction of the valve seat, wherein a valve stem cavity is provided inside the valve seat and communicates with the flow channel, wherein a sealing member is provided inside the valve stem cavity; A driving mechanism, the driving mechanism comprising: A drive chamber containing a deceleration fluid, the drive chamber is coaxially arranged above the valve stem chamber and communicated with the valve stem chamber, a detection device capable of detecting the sealing performance of a sealing member is provided on one side of the drive chamber, and a valve stem assembly is provided inside the drive chamber; A driving member, wherein the driving member is arranged at the upper end of the driving chamber, one end of the valve stem assembly passes through the valve stem cavity and is slidingly sealed with the sealing member, and the other end is connected to the driving member. A valve is provided at one end of the valve stem assembly, and can move and cut off the fluid in the flow channel under the drive of the driving member, and squeeze the deceleration fluid at the same time. After the deceleration fluid is squeezed, damping is generated on the valve stem assembly, and the detection device is driven to operate.

[0007] By adopting the above scheme, by setting the deceleration fluid inside the driving chamber, when the driving member drives the valve at one end of the valve stem assembly to move and cut off the fluid in the flow channel, the deceleration fluid can be squeezed synchronously, and the damping generated when the deceleration fluid is squeezed is used to buffer the impact generated when the valve contacts the valve seat at the end of the stroke. At the same time, when the deceleration fluid is squeezed, it can drive the detection device to operate, and by observing the detection device, the sealing performance of the sealing component inside the device can be judged.

[0008] In one embodiment of the present application, the driving chamber comprises: a first columnar chamber, wherein the first columnar chamber is arranged above the valve stem chamber, the deceleration fluid is arranged in the first columnar chamber, and the depth of the deceleration fluid is equal to the length of the first columnar chamber; The second columnar chamber is coaxially assembled on the first columnar chamber, and the diameter of the second columnar chamber is larger than that of the first columnar chamber.

[0009] By adopting the above scheme, by filling the deceleration fluid inside the first columnar chamber, the depth of the deceleration fluid can be consistent with the length of the first columnar chamber, so that the drive component can move without resistance inside the second columnar chamber until the valve approaches the end of the stroke, the drive component contacts and squeezes the deceleration fluid inside the first columnar chamber, and the deceleration fluid provides damping to decelerate the valve.

[0010] In one embodiment of the present application, the valve stem assembly includes: A valve stem, one end of which extends into the valve stem cavity and is fixedly connected to the valve, and the other end of which is connected to the driving shaft of the driving member; A piston block is coaxially mounted on the valve stem, the piston block is fixedly connected to the driving shaft of the driving member, and can be slidably sealed with the inner wall of the first columnar chamber under the drive of the driving member.

[0011] By adopting the above scheme, during the movement of the valve stem assembly, the piston block can move from the second columnar chamber to the first columnar chamber. When entering the first columnar chamber, it contacts and squeezes the deceleration fluid in the first columnar chamber, thereby utilizing the deceleration fluid to provide damping to the piston block, thereby cushioning the impact generated when the valve contacts the valve seat.

[0012] In one embodiment of the present application, the valve seat comprises: A valve body, wherein the flow channel is arranged inside the valve body and penetrates the valve body along the length direction of the valve body, and a connecting portion perpendicular to the valve body is arranged at the upper end of the valve body; A connecting piece, wherein the connecting piece and the connecting portion are both hollow inside, the connecting piece is assembled on the connecting portion, the connecting piece is communicated with the connecting portion, and the valve stem cavity is formed.

[0013] By adopting the above solution, an internally hollow connecting portion and a connecting member are provided on the valve body, so that the valve stem can reciprocate along the length direction of the valve stem cavity under the drive of the driving member.

[0014] In one embodiment of the present application, the sealing member comprises: A first sealing ring, wherein the connecting member is coaxially provided with a first sealing cavity outside the valve stem cavity, and the first sealing ring is provided in the first sealing cavity; A second sealing ring, the connecting portion is coaxially provided with a second sealing cavity outside the valve stem cavity, and the second sealing ring is arranged in the second sealing cavity.

[0015] By adopting the above solution and providing a plurality of sealing rings, it is ensured that when the valve stem moves in the valve stem cavity, the deceleration fluid and the fluid inside the flow channel will not leak, thereby improving the sealing performance of the device.

[0016] In one embodiment of the present application, the detection device comprises: A movable column, a cylindrical through hole is opened on one side of the lower end of the first cylindrical chamber, the cylindrical through hole extends along the radial direction of the first cylindrical chamber, the movable column is slidably assembled inside the cylindrical through hole, and a marking section is provided on the outside of one end of the movable column away from the first cylindrical chamber, and the marking section is provided with a scale extending along its own length direction; The piston column, the first columnar chamber is coaxially provided with a sealing groove on the outside of the columnar through hole, the piston column is coaxially sleeved on the outside of the moving column and is slidably sealed with the sealing groove, and the length D of the sealing groove, the length L of the piston column and the length S of the columnar through hole satisfy: L <D<S; A connecting plate is fixedly assembled on an end of the movable column away from the first columnar chamber, and an elastic member is connected between the connecting plate and the outer wall of the first columnar chamber.

[0017] By adopting the above scheme, when the deceleration fluid is squeezed, the deceleration fluid can push the movable column to move in the columnar through hole. At this time, the piston column moves from one end of the sealing groove close to the first columnar chamber to the other end, and drives the elastic part to deform. At this time, by observing the scale value extending from the marking segment, it is possible to judge whether the sealing performance of the seal inside the device is good.

[0018] In another embodiment of the present application, a filling cavity is opened inside the piston block, a plurality of connecting holes connected to the filling cavity are opened below the piston block, a cooling plate is provided at the upper end of the piston block, and a plurality of heat dissipation holes are opened on the inner wall of the second columnar chamber.

[0019] By adopting the above scheme, a filling chamber is opened in the piston block. When the piston block contacts and squeezes the deceleration fluid, the deceleration fluid can enter the filling chamber through the connecting hole, and the deceleration fluid inside the filling chamber is cooled by the cooling plate arranged at the upper end of the piston block, thereby cooling the deceleration fluid in the entire device, thereby avoiding increased losses caused by heating of the seal due to frequent operation of the device.

[0020] In another embodiment of the present application, a metal heat-conducting block is embedded on the piston block, and the cooling plate is attached to the upper surface of the metal heat-conducting block.

[0021] By arranging the metal heat-conducting block, the heat of the deceleration fluid can be quickly exchanged with the cold surface of the refrigeration plate through the metal heat-conducting block during the refrigeration process of the refrigeration plate.

[0022] In another embodiment of the present application, a strip-shaped chamber extending along the length direction of the valve stem is opened inside, and the upper end of the strip-shaped chamber is connected to the filling chamber.

[0023] By setting the above scheme, a strip-shaped chamber connected to the filling chamber is set inside the valve stem. When the deceleration fluid is contacted and squeezed, the deceleration fluid can pass through the filling chamber and enter the strip-shaped chamber, and cooperate with the cooling effect of the cooling plate on the deceleration fluid, thereby reducing the temperature of the entire valve stem. The valve stem can absorb the friction heat generated during the movement inside the seal, thereby reducing the increase in wear and loss caused by the increase in temperature.

[0024] In another embodiment of the present application, a plurality of reinforcing ribs are provided inside the strip-shaped chamber, and the plurality of reinforcing ribs are arranged at intervals along the length direction of the strip-shaped chamber.

[0025] By setting the above scheme, while ensuring that the deceleration fluid can reduce the temperature of the valve stem, the structural strength of the valve stem is improved by setting a plurality of reinforcing ribs.

[0026] In summary, the present application includes at least one of the following beneficial technical effects: 1. By setting the deceleration fluid, when the driving member drives the valve stem assembly to move and the valve cuts off the fluid in the flow channel, the piston block on the valve stem assembly can squeeze the deceleration fluid. After the deceleration fluid is squeezed, the damping generated can decelerate the valve, thereby reducing the impact generated when the valve contacts the valve seat.

[0027] 2. When the deceleration fluid is squeezed, it can drive the moving column to move toward the end away from the driving chamber. By judging the scale value of the marking segment on the moving column, it can be judged whether the deceleration fluid in the device is leaking, and then the sealing performance of the seal can be judged.

[0028] 3. By providing a valve stem with a strip-shaped chamber inside, the deceleration fluid is cooled by a cooling plate, and the valve stem and the filling chamber are connected to each other, so that when the piston block squeezes the deceleration fluid, the deceleration fluid with a lower cooling temperature can enter the strip-shaped chamber in the valve stem, thereby reducing the temperature of the valve stem, thereby reducing the temperature rise caused by friction when the valve stem moves inside the seal, and reducing the wear caused by the temperature rise. BRIEF DESCRIPTION OF THE DRAWINGS

[0029] Figure 1 It is a front cross-sectional view of a through valve with a speed reduction drive mechanism provided in the first embodiment of the present application when the flow channel is opened; Figure 2 It is a front cross-sectional view of a driving chamber of a through valve with a speed reduction driving mechanism provided in the first embodiment of the present application when the flow channel is opened; Figure 3 It is a front cross-sectional view of a through valve with a speed reduction drive mechanism provided in the first embodiment of the present application when the flow channel is closed; Figure 4 It is a front cross-sectional view of a driving chamber of a through valve with a speed reduction driving mechanism provided in the first embodiment of the present application when the flow channel is closed; Figure 5 yes Figure 3 A magnified schematic diagram of part A; Figure 6 It is a front cross-sectional view of a through valve with a speed reduction drive mechanism provided in the second embodiment of the present application, when the flow channel is closed, and a filling cavity; Figure 7 It is a top sectional view of a straight-through valve reinforcement rib with a speed reduction drive mechanism provided in the second embodiment of the present application.

[0030] Description of reference numerals: 1. valve seat; 11. flow channel; 12. valve stem chamber; 121. first sealing chamber; 122. second sealing chamber; 13. sealing member; 131. first sealing ring; 132. second sealing ring; 14. valve body; 141. connecting portion; 15. connecting member; 2. driving mechanism; 21. driving chamber; 211. first columnar chamber; 212. second columnar chamber; 22. detection device; 221. moving column; 2211. marking Segment; 222, columnar through hole; 223, piston column; 224, sealing groove; 225, connecting plate; 226, elastic member; 23, valve stem assembly; 231, valve; 232, valve stem; 2321, strip chamber; 2322, reinforcing rib; 233, piston block; 2331, filling chamber; 2332, connecting hole; 2333, cooling plate; 2334, heat dissipation hole; 2335, metal heat conductive block; 24, driving member; 3, deceleration fluid. DETAILED DESCRIPTION

[0031] The following is combined with Figure 1-7 A through valve with a speed reduction drive mechanism provided in the present application is further described in detail.

[0032] Example 1 A through valve with a speed reduction driving mechanism provided in an embodiment of the present application includes: a valve seat 1 and a driving mechanism 2.

[0033] See also Figure 1 and Figure 3 The valve seat 1 is provided with a flow channel 11 penetrating through the valve seat 1, and the flow channel 11 extends in the transverse direction of the valve seat 1. The valve seat 1 is provided with a valve stem cavity 12 communicating with the flow channel 11, and a sealing member 13 is provided inside the valve stem cavity 12. The driving mechanism 2 comprises: a driving chamber 21 and a driving member 24, wherein the driving chamber 21 contains a deceleration fluid 3, the driving chamber 21 is coaxially arranged above the valve stem cavity 12 and communicated with the valve stem cavity 12, a detection device 22 capable of detecting the sealing performance of the sealing member 13 is provided on one side of the driving chamber 21, a valve stem assembly 23 is provided inside the driving chamber 21, and the driving member 24 is arranged at the driving chamber 21. At the upper end of the dynamic chamber 21, one end of the valve stem assembly 23 passes through the valve stem cavity 12 and is slidably sealed with the sealing member 13, and the other end is connected to the driving member 24. A valve 231 is provided at one end of the valve stem assembly 23, and can move and cut off the fluid in the flow channel 11 under the drive of the driving member 24, and squeeze the deceleration fluid 3 at the same time. After the deceleration fluid 3 is squeezed, damping is generated on the valve stem assembly 23, and the detection device 22 is driven to operate. By squeezing the deceleration fluid 3, the impact of the valve 231 on the bottom of the flow channel 11 is reduced, and the detection device 22 is driven to operate to judge the sealing effect of the sealing member 13.

[0034] A controller (not shown) is also provided on the valve seat 1, and the controller is electrically connected to an external power source and the oil cylinder, so as to control the movement of the oil cylinder. The electrical connection method is an existing conventional technology, so it will not be described here.

[0035] In this embodiment, the deceleration fluid 3 may be water or hydraulic oil, and the driving member 24 may be an oil cylinder.

[0036] Please continue reading Figure 1 and Figure 3 The valve seat 1 includes: a valve body 14 and a connecting piece 15. The flow channel 11 is arranged inside the valve body 14 and penetrates the valve body 14 along the length direction of the valve body 14. The upper end of the valve body 14 is provided with a connecting portion 141 perpendicular to the valve body 14. The connecting piece 15 and the connecting portion 141 are both hollow inside. The connecting piece 15 is assembled on the connecting portion 141. The connecting piece 15 is communicated with the connecting portion 141 to form a valve stem cavity 12. By setting the connecting piece 15 and the connecting portion 141 to be hollow, the valve stem cavity 12 is formed, which facilitates the valve stem 232 to move up and down inside the valve stem cavity 12.

[0037] Please continue reading Figure 1 and Figure 3 The sealing member 13 includes: a first sealing ring 131 and a second sealing ring 132. The connecting member 15 is coaxially provided with a first sealing chamber 121 outside the valve stem chamber 12, and the first sealing ring 131 is provided in the first sealing chamber 121. The connecting portion 141 is coaxially provided with a second sealing chamber 122 outside the valve stem chamber 12, and the second sealing ring 132 is provided in the second sealing chamber 122. The number of the first sealing ring 131 and the second sealing ring 132 are both multiple, and the multiple first sealing rings 131 are superimposed and assembled in the first sealing chamber 121, and the multiple second sealing rings 132 are superimposed and assembled in the second sealing chamber 122. By arranging the first sealing ring 131 and the second sealing ring 132, the deceleration fluid 3 inside the driving chamber 21 will not leak when the valve stem 232 moves.

[0038] See also Figure 2 and Figure 4The driving chamber 21 includes: a first columnar chamber 211 and a second columnar chamber 212. The first columnar chamber 211 is arranged above the valve stem chamber 12. The deceleration fluid 3 is arranged in the first columnar chamber 211. The depth of the deceleration fluid 3 is equal to the length of the first columnar chamber 211. The second columnar chamber 212 is coaxially assembled on the first columnar chamber 211. The diameter of the second columnar chamber 212 is larger than that of the first columnar chamber 211. By setting two sections of the first columnar chamber 211 and the second columnar chamber 212 with inconsistent diameters, and adjusting the lengths of the first columnar chamber 211 and the second columnar chamber 212 according to the stroke of the valve 231, when the valve 231 moves to near the bottom of the flow channel 11, the piston block 233 can just reach the upper edge of the first columnar chamber 211 and contact with the deceleration fluid 3.

[0039] Please continue reading Figure 2 and Figure 4 The valve stem assembly 23 includes: a valve stem 232 and a piston block 233. One end of the valve stem 232 extends into the valve stem cavity 12 and is fixedly connected to a valve 231. The other end is connected to the driving shaft of the driving member 24. The piston block 233 is coaxially assembled on the valve stem 232. The piston block 233 is fixedly connected to the driving shaft of the driving member 24 and can be slidably sealed with the inner wall of the first columnar chamber 211 under the drive of the driving member 24. A rubber sealing ring is provided on the edge of the piston block 233. The piston block 233 and the first columnar chamber 211 are interference fit, so that when the piston block 233 moves inside the first columnar chamber 211, it can ensure that the deceleration fluid 3 in the first columnar chamber 211 will not leak into the first columnar chamber 211.

[0040] See also Figure 5, the detection device 22 includes: a moving column 221, a piston column 223, and a connecting plate 225. A columnar through-hole 222 is provided on one side of the lower end of the first columnar chamber 211. The columnar through-hole 222 extends along the radial direction of the first columnar chamber 211. The moving column 221 is slidably assembled inside the columnar through-hole 222. A marking section 2211 is provided outside one end of the moving column 221 away from the first columnar chamber 211. A scale extending along its own length direction (not shown in the figure) is provided on the marking section 2211. The first columnar chamber 211 coaxially opens a sealing groove 224 outside the columnar through-hole 222. The piston column 223 is coaxially sleeved outside the moving column 221 and is slidably sealed with the sealing groove 224. The length D of the sealing groove 224, the length L of the piston column 223, and the length S of the columnar through-hole 222 satisfy: L < D < S. The connecting plate 225 is fixedly assembled at one end of the moving column 221 away from the first columnar chamber 211. An elastic member 226 is connected between the connecting plate 225 and the outer wall of the first columnar chamber 211. By providing the moving column 221 that can move radially along the driving chamber 21, when the deceleration liquid 3 is squeezed, the deceleration liquid 3 can drive the moving column 221 to move outside the driving chamber 21, so that the leakage condition of the deceleration liquid 3 inside the driving chamber 21 can be judged according to the extended length of the marking section 2211, which is convenient for the staff to repair and replace the seal 13.

[0041] In this embodiment, the elastic member 226 is a columnar spring or a gas spring.

[0042] Embodiment 2 Please refer to Figure 6 , a direct-flow valve with a deceleration drive mechanism provided in the second embodiment of the present application. The structure of the second embodiment is basically the same as that of the first embodiment, and the difference lies in that: a filling cavity 2331 is provided inside the piston block 233. The piston block 233 is provided with a plurality of communication holes 2332 communicating with the filling cavity 2331 below the filling cavity 2331. A refrigeration sheet 2333 is provided at the upper end of the piston block 233. A plurality of heat dissipation holes 2334 are provided on the inner wall of the second columnar chamber 212. A metal heat conduction block 2335 is embedded in the piston block 233. The refrigeration sheet 2333 is attached to the upper surface of the metal heat conduction block 2335. By providing the filling cavity 2331 inside the piston block 233 and setting the refrigeration sheet 2333, the refrigeration sheet 2333 is used to absorb the heat of the metal heat conduction block 2335, and further absorb the heat of the deceleration liquid 3, so as to avoid the temperature generated when the piston block 233 reciprocates to squeeze the deceleration liquid 3.

[0043] In this embodiment, the metal heat conduction block 2335 can be a copper block. A heat conduction gel is coated on the upper surface of the copper block, and the refrigeration sheet 2333 is provided on the heat conduction gel, so that heat can conveniently pass through the metal heat conduction block 2335 and the heat conduction gel to the cold surface of the refrigeration sheet 2333.

[0044] Please continue reading Figure 6 A strip chamber 2321 extending along the length direction of the valve stem 232 is provided inside the valve stem 232, and the upper end of the strip chamber 2321 is connected with the filling chamber 2331. The strip chamber 2321 is used to connect the valve stem 232 with the filling chamber 2331, so that the refrigerated deceleration fluid 3 can be introduced into the valve stem 232 to absorb the temperature generated by the mutual friction between the seal 13 and the valve stem 232, thereby increasing the service life of the seal 13.

[0045] See also Figure 6 and Figure 7 A plurality of reinforcing ribs 2322 are provided inside the strip chamber 2321, and the plurality of reinforcing ribs 2322 are arranged at intervals along the length direction of the strip chamber 2321. By arranging a plurality of reinforcing ribs 2322 inside the strip chamber 2321, the valve stem 232 is ensured to be connected with the filling chamber 2331, while the structural strength of the valve stem 232 is improved.

[0046] In this embodiment, the reinforcing rib 2322 may be a rod-shaped or grid-shaped component. In summary, when the device is used to close the flow channel 11, the oil cylinder drives the piston block 233 and the valve stem 232 to move in the direction of the valve seat 1. When the piston block 233 moves from the second columnar chamber 212 to the first columnar chamber 211, the lower surface of the piston block 233 contacts the deceleration fluid 3. At this time, the valve 231 is close to the bottom of the flow channel 11. The oil cylinder continues to act, and the piston block 233 squeezes the deceleration fluid 3. After the deceleration fluid 3 receives the pressure, it drives the moving column 221 in the detection device 22 to move away from the driving chamber 21, and drives the elastic member 226 to deform until the marking section 2211 of the moving column 221 is fully extended. At this time, the valve 231 is against the bottom of the flow channel 11 to achieve the closure of the device. The force caused by the deformation of the elastic member 226 and the reaction force generated when the deceleration fluid 3 itself is squeezed provide damping for the movement of the piston block 233, thereby reducing the impact generated when the valve 231 contacts the bottom of the flow channel 11. In addition, when the sealing performance of the internal seal 13 decreases, the deceleration fluid 3 will leak into the flow channel 11, and the stroke of the valve 231 is fixed. Therefore, the length of the extension of the marking section 2211 decreases. By observing the scale value of the extension of the marking section 2211, the sealing performance of the internal seal 13 of the device can be judged.

[0047] The above are all preferred embodiments of the present application, and the protection scope of the present application is not limited thereto. Therefore, any equivalent changes made according to the structure, shape, and principle of the present application should be included in the protection scope of the present application.

Claims

1. A through valve with a speed reduction drive mechanism, characterized in that: include: A valve seat (1), wherein a flow channel (11) is provided inside the valve seat (1) and runs through the valve seat, wherein the flow channel (11) extends in the transverse direction of the valve seat (1), wherein a valve stem cavity (12) is provided inside the valve seat (1) and communicates with the flow channel (11), wherein a sealing member (13) is provided inside the valve stem cavity (12); A driving mechanism (2), wherein the driving mechanism (2) comprises: A drive chamber (21) containing a deceleration fluid (3) therein, the drive chamber (21) being coaxially arranged above the valve stem chamber (12) and being in communication with the valve stem chamber (12), a detection device (22) capable of detecting the sealing performance of the sealing member (13) being provided on one side of the drive chamber (21), and a valve stem assembly (23) being provided inside the drive chamber (21); A driving member (24), wherein the driving member (24) is arranged at the upper end of the driving chamber (21); one end of the valve stem assembly (23) passes through the valve stem chamber (12) and is slidably sealed with the sealing member (13); the other end is connected to the driving member (24); a valve (231) is provided at one end of the valve stem assembly (23), and can move and cut off the fluid in the flow channel (11) under the drive of the driving member (24), and squeeze the deceleration fluid (3) at the same time. After the deceleration fluid (3) is squeezed, it generates damping on the valve stem assembly (23) and drives the detection device (22) to operate.

2. A through valve with a speed reduction drive mechanism according to claim 1, characterized in that: The driving chamber (21) comprises: a first columnar chamber (211), wherein the first columnar chamber (211) is arranged above the valve stem chamber (12), the deceleration fluid (3) is arranged in the first columnar chamber (211), and the depth of the deceleration fluid (3) is equal to the length of the first columnar chamber (211); The second columnar chamber (212) is coaxially assembled on the first columnar chamber (211), and the diameter of the second columnar chamber (212) is larger than that of the first columnar chamber (211).

3. A through valve with a speed reduction drive mechanism according to claim 2, characterized in that: The valve stem assembly (23) comprises: a valve stem (232), one end of which extends into the valve stem cavity (12) and is fixedly connected to the valve (231), and the other end of which is connected to the driving shaft of the driving member (24); A piston block (233), wherein the piston block (233) is coaxially mounted on the valve stem (232), the piston block (233) is fixedly connected to the driving shaft of the driving member (24), and can be slidably sealed with the inner wall of the first columnar chamber (211) under the drive of the driving member (24).

4. A through valve with a speed reduction drive mechanism according to claim 1, characterized in that: The valve seat (1) comprises: A valve body (14), wherein the flow channel (11) is arranged inside the valve body (14) and penetrates the valve body (14) along the length direction of the valve body (14), and a connecting portion (141) perpendicular to the valve body (14) is provided at the upper end of the valve body (14); A connecting piece (15), wherein the connecting piece (15) and the connecting portion (141) are both hollow inside, the connecting piece (15) is assembled on the connecting portion (141), the connecting piece (15) is communicated with the connecting portion (141), and the valve stem cavity (12) is formed.

5. A through valve with a speed reduction drive mechanism according to claim 4, characterized in that: The sealing member (13) comprises: A first sealing ring (131), wherein the connecting member (15) is coaxially provided with a first sealing cavity (121) outside the valve stem cavity (12), and the first sealing ring (131) is arranged in the first sealing cavity (121); A second sealing ring (132), the connecting portion (141) is coaxially provided with a second sealing cavity (122) outside the valve stem cavity (12), and the second sealing ring (132) is arranged in the second sealing cavity (122).

6. A through valve with a speed reduction drive mechanism according to claim 2, characterized in that: The detection device (22) comprises: A movable column (221), a columnar through hole (222) is provided on one side of the lower end of the first columnar chamber (211), the columnar through hole (222) extends along the radial direction of the first columnar chamber (211), the movable column (221) is slidably assembled inside the columnar through hole (222), and a marking section (2211) is provided on the outside of one end of the movable column (221) away from the first columnar chamber (211), and the marking section (2211) is provided with a scale extending along its own length direction; The piston column (223) is provided with a sealing groove (224) coaxially on the outside of the columnar through hole (222) of the first columnar chamber (211). The piston column (223) is coaxially sleeved on the outside of the movable column (221) and is slidably sealed with the sealing groove (224). The length D of the sealing groove (224), the length L of the piston column (223) and the length S of the columnar through hole (222) satisfy: L <D<S; A connecting plate (225) is fixedly mounted on an end of the movable column (221) away from the first columnar chamber (211), and an elastic member (226) is connected between the connecting plate (225) and the outer wall of the first columnar chamber (211).

7. A through valve with a speed reduction drive mechanism according to claim 3, characterized in that: A filling cavity (2331) is provided inside the piston block (233), and a plurality of connecting holes (2332) connected to the filling cavity (2331) are provided below the piston block (2331). A cooling plate (2333) is provided at the upper end of the piston block (233), and a plurality of heat dissipation holes (2334) are provided on the inner wall of the second columnar chamber (212).

8. A through valve with a speed reduction drive mechanism according to claim 7, characterized in that: A metal heat-conducting block (2335) is embedded on the piston block (233), and the cooling plate (2333) is attached to the upper surface of the metal heat-conducting block (2335).

9. A through valve with a speed reduction drive mechanism according to claim 8, characterized in that: The valve stem (232) has a strip-shaped chamber (2321) extending along its length direction, and the upper end of the strip-shaped chamber (2321) is connected to the filling chamber (2331).

10. A through valve with a speed reduction drive mechanism according to claim 9, characterized in that: A plurality of reinforcing ribs (2322) are provided inside the strip-shaped chamber (2321), and the plurality of reinforcing ribs (2322) are arranged at intervals along the length direction of the strip-shaped chamber (2321).

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