A multi-stage valve core structure and a valve having the same

Abstract

The present invention discloses a multi-stage valve core structure, which includes a fixed valve core and at least one movable valve core stacked on the fixed valve core. The fixed valve core is provided with a plurality of first flow holes, and the expanded movable valve core forms a fluid passage for fluid to flow through. The movable valve core is provided with a valve core rod, and through the push and pull of the valve core rod, the movable valve core can axially reciprocate relative to the fixed valve core to close / open the fluid passage. A valve having the multi-stage valve core structure includes a valve body. The valve body is provided with the above multi-stage valve core structure, and the valve body is provided with a valve switch for opening and closing the on / off of the multi-stage valve core structure. By the above method, the valve cores are stacked. Pushing and pulling the valve core rod causes the movable valve core to axially move to form a fluid passage and stack on the fixed valve core to seal the fluid passage. The fluid pressure acts to make the valve core have a one-way sealing and self-sealing effect; a variety of valve switches are used to control the opening and closing of the valve core structure, with diverse and reliable action modes and quick operation.

Description

Technical Field

[0001] The present invention relates to the field of valve technology, and in particular to a multi-stage valve core structure and a valve having the multi-stage valve core structure. Background Art

[0002] The valve is a control component in the fluid delivery system, which has the functions of shutoff, regulation, diversion, backflow prevention, pressure stabilization, diversion or overflow pressure relief. The valve is usually composed of a valve core, a valve body and a switch to open the valve. The valve body is provided with a channel for fluid circulation. The valve is opened and closed by the switch, so that the fluid circulates and disconnects in the valve body. However, when the valve core in the prior art controls the on and off of the valve in the valve body, the structure of the valve core is a valve disc. The valve disc is pressed down by applying external force to press the inlet of the valve body, or the valve disc is rotated so that the circular periphery of the rotating valve disc contacts and seals with the inner wall of the valve body to close the valve. In the prior art, the valve of the traditional structure, such as the butterfly valve, has a closing part (valve disc or laminated plate) as a disc, which rotates around the valve shaft to achieve opening and closing. When closing the valve, the ordinary butterfly valve relies on the fixing effect of the valve shaft. During use, the periphery of the closing part and the inner wall of the valve body are prone to wear, affecting the sealing effect of the valve. Summary of the invention

[0003] The purpose of the present invention is to provide a multi-stage valve core structure and a valve with the structure, wherein the movable valve cores are stacked, and the movable valve cores are made to move axially by pushing and pulling the valve core rod to form a fluid channel, and the movable valve core is stacked on the fixed valve core to seal the fluid channel, and the one-way seal of the valve core has a good self-sealing effect through the action of fluid pressure; the opening and closing of the valve core structure are controlled by a variety of valve switches, and the action modes are diverse, reliable, and quick to operate.

[0004] In order to solve the above technical problems, the technical solution provided by the present invention is: a multi-stage valve core structure, including a fixed valve core and at least one movable valve core stacked on the fixed valve core, the fixed valve core has a plurality of first flow holes and forms a fluid channel for fluid circulation with the unfolded movable valve core, the movable valve core is provided with a valve core rod and through the pushing and pulling of the valve core rod, the movable valve core can move back and forth axially relative to the fixed valve core to close / open the fluid channel.

[0005] The present invention adopts the above-mentioned technical scheme. After the movable valve core is pushed by the valve core rod to axially move and expand, the movable valve core is separated from the first flow hole to form a fluid channel. When the movable valve core moves axially toward the fixed valve core, the movable valve core is stacked on the fixed valve core and seals the flow hole, thereby closing the valve core. When closed, the fluid has static pressure on the movable valve core, and the movable valve core unidirectionally seals the fixed valve core. The valve core has a self-sealing function under the static pressure of the fluid, thereby improving the sealing performance.

[0006] The above multi-stage valve core structure, wherein the movable valve core includes a first valve core, a second valve core and a third valve core that can be stacked on each other and axially expanded. A plurality of second flow holes and third flow holes are provided on the first valve core and the second valve core. The valve core rod on the third valve core passes through the first valve core and the second valve core and extends outside the fixed valve core. When the valve core rod on the third valve core is pushed by an external force, the third valve core, the second valve core and the first valve core move axially in sequence and leave the first flow hole. The second flow hole, the third flow hole and the flow hole on the fixed valve core form a fluid channel for conveying fluid. When the first valve core, the second valve core and the third valve core are stacked on the fixed valve core in sequence, the movable valve core seals the third flow hole, the second flow hole and the first flow hole in sequence.

[0007] In the above multi-stage valve core structure, a first receiving groove, a second receiving groove and a third receiving groove are respectively provided on the fixed valve core, the first valve core and the second valve core. When the first valve core, the second valve core and the third valve core are stacked on the fixed valve core, they are respectively received in the first receiving groove, the second receiving groove and the third receiving groove. When stacked, the first valve core, the second valve core and the third valve core are received in the receiving grooves, with a more compact structure and less occupied space.

[0008] In the above multi-stage valve core structure, sealing grooves and sealing elements are provided on the outer peripheries of the first valve core, the second valve core and the third valve core. The sealing elements are arranged in the sealing grooves. In the stacked state, the sealing elements are used to seal the side walls of the receiving grooves, and the first valve core, the second valve core and the third valve core seal the first flow hole, the second flow hole and the third flow hole.

[0009] To solve the above technical problems, another technical solution provided by the present invention is: a valve, including a valve body, wherein the valve body is provided with the multi-stage valve core structure described in any one of the above technical solutions, and the valve body is provided with a valve switch for opening and closing the multi-stage valve core structure. The fixed valve core is installed inside the valve core, and the valve switch is connected to the valve core rod of the third valve core to drive it to push and pull the movable valve core to act.

[0010] In the above valve, the valve switch includes a bidirectional screw, a screw seat and a connecting piece. The screw seat is arranged on the valve body. One end of the bidirectional screw passes through the screw seat and extends into the interior of the valve body, and the other end is exposed outside the valve body and connected with a handle. Movable nuts are arranged on the bidirectional threads of the bidirectional screw. The movable nuts are movably connected to the connecting piece through push-pull pieces, and the connecting piece is connected to the valve core rod of the third valve core. When the bidirectional screw rotates, the movable nuts move in the same or opposite directions on the screw, and the connecting piece is pushed along the axial direction inside the valve body through the push-pull pieces, thereby pushing and pulling the valve core rod on the third valve core, so that the multi-stage valve core structure acts to open / close the valve body. The screw has a self-locking function and can be stabilized in any state to determine the opening degree of the valve.

[0011] For the above-mentioned valve, a handle fixing seat is provided on the screw seat, and the handle is arranged on the handle fixing seat through a handle rod. The handle rod is used to connect the handle, and the handle is connected to the bidirectional screw and turns the bidirectional screw to drive the movement of the movable nut on the screw, and then pushes and pulls the valve core rod through the push-pull piece and the connecting piece to open or close the valve.

[0012] For the above-mentioned valve, a ratchet sleeve and a movable ratchet pawl are provided on the screw seat, and the movable ratchet pawl is connected in cooperation with the ratchet teeth on the ratchet sleeve. When the handle drives the bidirectional screw to rotate to a certain position, the self-locking function is realized through the ratchet mechanism, so that the movable valve core is opened or closed to a certain extent, and it can be used to control the flow rate of the conveyed fluid.

[0013] For the above-mentioned valve, the valve switch includes a cylinder, an air pipe, a piston and a piston rod. The cylinder is fixed on the fixed valve core. One end face of the piston is connected to the valve core rod of the third valve core. One end of the piston rod extends out of the cylinder and is connected to a return sleeve. A return spring is arranged between the return sleeve and the cylinder. One end of the air pipe is connected to the rodless cavity of the cylinder, and the other end is connected to an air valve arranged on the outer wall of the valve body. By connecting compressed gas through the air pipe, the piston rod and the piston are driven to reciprocate in the cylinder, so as to open or close the valve, and automatic electrical control can be realized.

[0014] For the above-mentioned valve, the valve switch includes a push-pull sleeve, a radial elastic ring, an inner rotating sleeve and an outer rotating sleeve. The side wall of the push-pull sleeve is provided with a first inclined groove, and a connecting structure is arranged on the end face and is connected to the valve core rod of the third valve core. The radial elastic ring is sleeved on the inner wall of the push-pull sleeve, the inner rotating sleeve is sleeved on the outer wall of the push-pull sleeve, and a slant groove guide post on the radial elastic ring passes through the first inclined groove and is connected to the inner wall of the inner rotating sleeve. The outer rotating sleeve is sleeved outside the valve body and is connected to the inner rotating sleeve, driving the inner rotating sleeve and the radial elastic ring to rotate, so that the slant groove guide post moves in the first inclined groove and pushes the push-pull sleeve to move axially. The outer rotating sleeve drives the inner rotating sleeve to rotate, so that the slant groove guide post rotates and moves in the inclined groove on the push-pull sleeve, thereby pushing the push-pull sleeve to move axially, driving the valve core rod of the third valve core connected thereto to move axially, and the valve core can be closed / opened by operating the outer rotating sleeve in different rotation directions on the valve body. The action is reliable, the opening degree of the valve core can be arbitrarily opened, and the flow rate can be further controlled.

[0015] For the above-mentioned valve, a guide post fixing ring is arranged inside the inner rotating sleeve, the radial elastic ring is encapsulated in the guide post fixing ring, and the slant groove guide post passes through the through hole on the side wall of the guide post fixing ring and abuts against the inner wall of the inner rotating sleeve. The guide post fixing ring is sleeved on the outer periphery of the radial elastic ring to balance the radial elastic ring and prevent deformation during rotation.

[0016] For the valve described above, the valve body is provided with a straight groove and a positioning hole. A positioning guide post and a positioning spring are arranged between the inner rotating sleeve and the outer rotating sleeve. When the outer and inner rotating sleeves are rotated, the positioning guide post moves in the straight groove. When the positioning guide post is positioned in the positioning hole, the inner and outer rotating sleeves are in the rotated-in-place state. The positioning guide post is used to drive the inner rotating sleeve to rotate when the outer rotating sleeve is rotated. When rotated in place, the positioning spring acts to make the positioning guide post pass through the positioning hole. At this time, the outer rotating sleeve cannot continue to rotate. The positioning guide post should be pressed into the positioning hole before it can be rotated continuously. The position of the positioning hole can be set as the position point where the valve core is in the open or closed state.

[0017] For the valve described above, the valve switch includes a rotating sleeve, a sealing rotating sleeve and a push-pull sleeve. One end face of the push-pull sleeve is connected to the valve core rod of the third valve core. The contact end faces between the sealing rotating sleeve and the push-pull sleeve are provided with mutually cooperating inclined push surfaces. The rotating sleeve and the sealing rotating sleeve are respectively sleeved on the outer wall and the inner wall of the valve body, and a positioning spring and a positioning guide post are arranged therebetween. The rotation of the rotating sleeve drives the sealing rotating sleeve to rotate through the positioning spring and the positioning guide post. Through the inclined push surface between the sealing rotating sleeve and the push-pull sleeve, the push-pull sleeve is moved away from or close to the sealing rotating sleeve, further driving the axial movement of the valve core rod, and then opening / closing the valve core.

[0018] For the valve described above, the side wall of the valve body is provided with a straight groove and a positioning hole. When the rotating sleeve rotates, the positioning guide post moves in the straight groove. When the positioning guide post is positioned in the positioning hole, the rotating sleeve rotates in place. The rotating sleeve drives the sealing rotating sleeve to rotate through the positioning guide post. When the positioning guide post passes out of the positioning hole, the rotating sleeve cannot rotate. At this time, by pressing the positioning guide post to make it retract into the valve body, the rotating sleeve can be rotated continuously to position the rotation position of the rotating sleeve.

[0019] For the valve described above, the valve switch includes a push-pull sleeve and a rotating sleeve. One end face of the push-pull sleeve is connected to the valve core rod of the third valve core. The valve body is provided with a second inclined groove. A positioning spring and a positioning guide post are arranged between the push-pull sleeve and the rotating sleeve. The rotating sleeve is provided with a long strip outer convex. The positioning guide post passes through the second inclined groove and abuts against the inner wall of the long strip outer convex of the rotating sleeve. When the rotating sleeve rotates, the inner wall of the long strip outer convex drives the push-pull sleeve to rotate through the positioning guide post. The positioning guide post moves in the inclined groove on the valve body, causing the axial movement of the positioning guide post, and then driving the axial movement of the push-pull sleeve to drive the valve core rod to act, and then closing / opening the valve core.

[0020] For the valve described above, the valve body is provided with concave rings at both ends of the second inclined groove. The concave rings are provided with open steel rings, and the open steel rings abut against the two open edges of the rotating sleeve. The open steel rings limit the rotational movement of the rotating sleeve between the open steel rings.

[0021] The beneficial effects achieved by the present invention are:

[0022] 1. Hydrostatic pressure formula for the valve core: F = P * V. The force on the valve core is linearly related to the pressure area. By dividing the valve core structure into multiple levels, the pressure area of the valve core opened at one time is reduced, and the hydrostatic pressure received by the valve core is reduced, effectively reducing the difficulty of opening the valve core when used in large-diameter pipelines.

[0023] 2. Better sealing performance. When the valve core is closed, the valve core is unidirectionally sealed under the action of hydrostatic pressure, and a piston-type seal is used. The greater the pressure, the better the sealing performance, and it has a self-sealing effect compared with ordinary valves.

[0024] 3. The multi-stage valve core structure is arranged in the valve body and can be combined with various valve opening and closing structures to drive the valve core to close and open. The action is reliable, and the valve core can be opened in any state to control the flow rate of the valve body.

[0025] 4. The multi-stage valve core structure is arranged in the valve body. The third valve core, the second valve core and the first valve core stacked are received through a receiving groove. Sealing grooves and seals are arranged around each valve core to seal the side wall of the receiving groove. The valve core structure seals the first flow hole, the second flow hole and the third flow hole, making the structure compact and the sealing effect good when the valve cores are stacked. BRIEF DESCRIPTION OF THE DRAWINGS

[0026] Figure 1 is a schematic diagram of the stacked structure of a multi-stage valve core structure according to an embodiment of the present invention;

[0027] Figure 2 is a schematic diagram of the unfolded structure of a multi-stage valve core structure according to an embodiment of the present invention;

[0028] Figure 3 is a schematic diagram of the exploded structure of a multi-stage valve core structure according to an embodiment of the present invention;

[0029] Figure 4 is a schematic diagram of the external structure of an embodiment of the valve of the present invention;

[0030] Figure 5 is a schematic diagram of the unfolded structure of the first embodiment of the valve of the present invention;

[0031] Figure 6 is a schematic diagram of the valve opening and closing structure of the first embodiment of the valve of the present invention;

[0032] Figure 7 is a schematic diagram of the exploded valve opening and closing structure of the first embodiment of the valve of the present invention;

[0033] Figure 8 is a sectional view of the three-dimensional structure of the second embodiment of the valve of the present invention;

[0034] Figure 9 is a sectional view of the three-dimensional structure of the third embodiment of the valve of the present invention;

[0035] Figure 10 is an exploded perspective view of the third embodiment of the valve of the present invention;

[0036] Figure 11 is a side cross-sectional view of the third embodiment of the valve of the present invention;

[0037] Figure 12 is a cross-sectional view of the valve closing structure of the fourth embodiment of the valve of the present invention;

[0038] Figure 13 is a cross-sectional view of the valve opening structure of the fourth embodiment of the valve of the present invention;

[0039] Figure 14 is an exploded schematic view of the fourth embodiment of the valve of the present invention;

[0040] Figure 15 is a perspective view of the three-dimensional structure of the valve body of the fourth embodiment of the valve of the present invention;

[0041] Figure 16 is a cross-sectional view of the valve closing structure of the fifth embodiment of the valve of the present invention;

[0042] Figure 17 is a cross-sectional view of the valve opening structure of the fifth embodiment of the valve of the present invention;

[0043] Figure 18 is an exploded schematic view of the fifth embodiment of the valve of the present invention.

[0044] Explanation of reference numerals: 1 fixed valve core, 101 first flow hole, 2 movable valve core, 201 first receiving groove, 202 second receiving groove, 203 third receiving groove, 20 valve core rod, 21 first valve core, 22 second valve core, 23 third valve core, 24 sealing groove, 25 sealing member, 3 valve body, 301 straight groove, 302 positioning hole, 303 second inclined groove, 304 concave ring, 305 open steel ring, 4 valve switch, 401 bidirectional screw, 402 screw seat, 403 connecting member, 404 handle, 405 movable nut, 406 push-pull piece, 4021 handle fixing seat, 4022 handle rod, 4023 ratchet sleeve, 4024 movable pawl, 411 cylinder, 412 air pipe, 413 piston, 414 piston rod, 415 return sleeve, 416 return spring, 417 air valve, 421 push-pull sleeve, 422 radial elastic ring, 423 inner rotating sleeve, 424 outer rotating sleeve, 425 positioning guide post, 426 positioning spring, 4211 first inclined groove, 4221 inclined groove guide post, 4231 guide post fixing ring, 431 rotating sleeve, 432 sealing rotating sleeve, 433 inclined push surface, 4311 long strip convex. Detailed implementation manners

[0045] The present invention provides a multi-stage spool structure and a valve having the structure. The present invention will be further described below in conjunction with different embodiments of the multi-stage spool structure and the valve.

[0046] Embodiment of the multi-stage spool structure

[0047] Referring to Figures 1 to 3 As shown, a multi-stage spool structure includes a fixed spool 1 and at least one movable spool 2 stacked on the fixed spool 1. The fixed spool 1 has a plurality of first flow holes 101, and the expanded movable spool 2 forms a fluid passage for fluid to flow through. The movable spool 2 is provided with a spool rod 20, and by pushing and pulling the spool rod 20, the movable spool 2 can reciprocate axially relative to the fixed spool 1 to close / open the fluid passage. The process of the movable spool 2 moving axially relative to the fixed spool 1 to open the fluid passage is as follows: the stacked movable spool 2 leaves the fixed spool 1, disengages from the first flow holes 101 on the fixed spool 1, the fluid enters the space between the movable spool 2 and the fixed spool 1 and flows out from the first flow holes 101, forming the fluid passage for transporting the fluid; the process of the movable spool 2 moving axially relative to the fixed spool 1 to close the fluid passage is: the expanded movable spool 2 approaches the fixed spool 1 until it fits the first flow holes 101 to seal them. At this time, the fluid is blocked, thereby closing the three-dimensional passage.

[0048] In this embodiment, the movable spool 2 includes a first spool 21, a second spool 22, and a third spool 23 that can be stacked and axially expanded with each other. The first spool 21 and the second spool 22 are provided with a plurality of second flow holes 211 and third flow holes 221. The spool rod 20 on the third spool 23 passes through the first spool 21 and the second spool 22 and extends outside the fixed spool 1.

[0049] The fixed spool 1, the first spool 21, and the second spool 22 are respectively provided with a first receiving groove 201, a second receiving groove 202, and a third receiving groove 203. When the first spool 21, the second spool 22, and the third spool 23 are stacked on the fixed spool 1, they are respectively received in the first receiving groove 201, the second receiving groove 202, and the third receiving groove 203.

[0050] The outer peripheries of the first spool 21, the second spool 22, and the third spool 23 are provided with sealing grooves 24 and sealing members 25.

[0051] Referring to Figure 4As shown in the figure, a valve includes a valve body 3. A multi-stage valve core structure described in the above embodiment is provided inside the valve body 3. A valve switch 4 for opening and closing the multi-stage valve core structure is provided on the valve body 3. Among them, the fixed valve core 1 of the multi-stage valve core structure is fixed on the inner wall of the valve body 3. Fluid inlet and outlet ports are provided at both ends of the valve 3. When the movable valve core 2 is driven by an external force to open the valve, the fluid enters the valve 3 from the inlet port and flows out from the outlet port. The fluid has a flowing pressure on the first valve core 21, the second valve core 22 and the third valve core 23 and has a static pressure when the valve is closed.

[0052] For different embodiments of a valve with a multi-stage valve core structure according to the present invention, further description will be made in combination with the drawings and specific embodiments.

[0053] First Embodiment of the Valve

[0054] Referring to Figure 5 、 Figure 6 and Figure 7 As shown in the figure, the valve switch 4 includes a bidirectional screw 401, a screw seat 402 and a connecting member 403. The screw seat 402 is provided on the valve body 3. One end of the bidirectional screw 401 passes through the screw seat 402 and extends into the interior of the valve body 3, and the other end thereof is exposed outside the valve body 3 and connected to a handle 404. Movable nuts 405 are provided on the bidirectional threads of the bidirectional screw 401. The movable nuts 405 are movably connected to the connecting member 403 through push-pull pieces 406. The connecting member 403 is connected to the valve stem 20 of the third valve core 23.

[0055] A handle fixing seat 4021 is provided on the screw seat 402. The handle 404 is provided on the handle fixing seat 4021 through a handle rod 4022.

[0056] A ratchet sleeve 4023 and a movable pawl 4024 are provided on the screw seat 402. The movable pawl 4024 is connected in cooperation with the ratchet teeth on the ratchet sleeve 4023.

[0057] When the handle 404 is turned to rotate the bidirectional screw 401, the movable nuts 405 thread-follow on the bidirectional threads of the bidirectional screw 401. The two movable nuts 405 move simultaneously along the center or both ends of the bidirectional screw 401. By movably connecting the movable nuts 405 to the push-pull pieces 406, such as by hinged connection, pin connection, etc., the two push-pull pieces 406 are driven to act. The other end of the push-pull piece 406 is movably connected to the connecting member 403, such as by hinged connection, pin connection, etc., so that the connecting member 403 reciprocates axially along the inner cavity of the valve body 3, thereby driving the valve stem 20 on the third valve core 23 connected thereto to push and pull the third valve core 23, the second valve core 22 and the first valve core 21 in sequence, thereby forming a fluid passage or closing the fluid passage, and achieving the purpose of opening the valve core.

[0058] Second Embodiment of the Valve

[0059] Refer to Figure 8 As shown, the valve switch 4 includes a cylinder 411, an air pipe 412, a piston 413 and a piston rod 414. The cylinder 411 is fixed on the fixed valve core 1. One end face of the piston 413 is connected to the valve core rod 20 of the third valve core 23. One end of the piston rod 414 extends outside the cylinder 411 and is connected to a return sleeve 415. A return spring 416 is provided between the return sleeve 415 and the cylinder 411. One end of the air pipe 412 is connected to the rodless cavity of the cylinder 411, and the other end is connected to an air valve 417 provided on the outer wall of the valve body 3.

[0060] In specific implementation, input compressed gas drives the piston 413 and the piston rod 414 to move in the cylinder 411. When the piston rod 414 extends, the piston 413 pushes the valve core rod 20 of the third valve core 23 to act, thereby sequentially opening the third valve core 23, the second valve core 22 and the first valve core 21 to achieve the purpose of opening the valve. During this process, the return spring 416 is compressed. When closing the valve, the compressed gas is discharged. Under the action of the return spring 416, the return sleeve 415 is expanded, so that the piston rod 414 and the piston 413 retract, driving the valve core rod 20 to move axially, so that the third valve core 23, the second valve core 22 and the first valve core 21 are stacked on top of each other and finally stacked on the fixed valve core 1, thereby closing the valve.

[0061] Valve Embodiment Three

[0062] Refer to Figure 9 , Figure 10 and Figure 11 As shown, the valve switch 4 includes a push-pull sleeve 421, a radial elastic ring 422, an inner rotating sleeve 423 and an outer rotating sleeve 424. The side wall of the push-pull sleeve 421 is provided with a first inclined groove 4211, and the end face is provided with a connection structure and is connected to the valve core rod 20 of the third valve core 23. The radial elastic ring 422 is sleeved on the inner wall of the push-pull sleeve 421. The inner rotating sleeve 423 is sleeved on the outer wall of the push-pull sleeve 421. An inclined groove guide post 4221 is provided on the radial elastic ring 422 and passes through the first inclined groove 4211 and is connected to the inner wall of the inner rotating sleeve 423. The outer rotating sleeve 424 is sleeved outside the valve body 3 and is connected to the inner rotating sleeve 423, driving the inner rotating sleeve 423 and the radial elastic ring 422 to rotate, so that the inclined groove guide post 4221 moves in the first inclined groove 4211 and pushes the push-pull sleeve 421 to move axially.

[0063] A guide post fixing ring 4231 is provided inside the inner rotating sleeve 423. The radial elastic ring 422 is encapsulated in the guide post fixing ring 4231. The inclined groove guide post 4221 passes through a through hole in the side wall of the guide post fixing ring 4231 and abuts against the inner wall of the inner rotating sleeve 423.

[0064] The valve body 3 is provided with a straight groove 301 and a positioning hole 302. A positioning guide post 425 and a positioning spring 426 are arranged between the inner rotating sleeve 423 and the outer rotating sleeve 424. When the outer and inner rotating sleeves 424 and 423 are rotated, the positioning guide post 425 moves in the straight groove 301. When the positioning guide post 425 is positioned in the positioning hole 302, the inner and outer rotating sleeves 423 and 424 are in the rotated-in-place state.

[0065] In the specific implementation of this embodiment, rotating the outer rotating sleeve 424 drives the inner rotating sleeve 423 to rotate, so that the inner rotating sleeve 423 drives the inclined groove guide post 4221, the radial elastic ring 422 and the guide post fixing ring 4231 to rotate. The inclined groove guide post 4221 moves in the first inclined groove 4211 of the push-pull sleeve 421. Since the axial position of the inclined groove guide post 4221 remains unchanged during rotation, when the inclined groove guide post 4221 moves along the first inclined groove 4211, it has an axial thrust on the push-pull sleeve 421, causing the push-pull sleeve 421 to move axially within the valve body 3, and then pushing the valve stem 20 of the third valve core 23 to achieve the purpose of opening or closing the valve.

[0066] Fourth embodiment of the valve

[0067] Refer to Figure 12 、 13 As shown in 14 and 15, the valve switch 4 includes a rotating sleeve 431, a sealing rotating sleeve 432 and a push-pull sleeve 421. One end face of the push-pull sleeve 421 is connected to the valve stem 20 of the third valve core 23. The contact end face between the sealing rotating sleeve 432 and the push-pull sleeve 421 is provided with mutually cooperating inclined push surfaces 433. The rotating sleeve 431 and the sealing rotating sleeve 432 are respectively arranged on the outer wall and the inner wall of the valve body 3, and a positioning spring 426 and a positioning guide post 425 are arranged therebetween. The side wall of the valve body 3 is provided with a straight groove 301 and a positioning hole 302. When the rotating sleeve 431 rotates, the positioning guide post 425 moves in the straight groove 301. When the positioning guide post 425 is positioned in the positioning hole 302, the rotating sleeve 431 rotates in place.

[0068] In the specific implementation process of this embodiment, the rotation of the rotating sleeve 431 drives the sealing rotating sleeve 432 to rotate. The push-pull sleeve 421 is axially moved by the inclined push surface 433, thereby pushing the valve stem 20 to expand the third valve core 23, the second valve core 22 and the first valve core 21 to form a fluid passage for fluid transportation. The inclined push surface 433 is an inclined cut provided on the contact end face between the push-pull sleeve 421 and the sealing rotating sleeve 432. When the valve is closed, the inclined cuts engage with each other. When the valve is opened, the inclined cuts are separated from each other, and when the outer ends of the two inclined cuts abut, it is the fully opened state of the valve.

[0069] Fifth embodiment of the valve

[0070] Refer to Figure 16 、 Figure 17 AndFigure 18 As shown, the valve switch 4 includes a push-pull sleeve 421 and a rotating sleeve 431. One end face of the push-pull sleeve 421 is connected to the valve stem 20 of the third valve core 23. A second inclined groove 303 is provided on the valve body 3. A positioning spring 426 and a positioning guide post 425 are provided between the push-pull sleeve 421 and the rotating sleeve 431. A long strip outer protrusion 4311 is provided on the rotating sleeve 431. The positioning guide post 425 passes through the second inclined groove 303 and abuts against the inner wall of the long strip outer protrusion 4311 of the rotating sleeve 431. Concave rings 304 are provided on the valve body 3 at both ends of the second inclined groove 303. An open steel ring 305 is provided on the concave ring 304, and the open steel ring 305 abuts against the two open edges of the rotating sleeve 431.

[0071] In the specific implementation of this embodiment, when the rotating sleeve 431 rotates, the positioning guide post 425 inside its long strip outer protrusion 4311 rotates accordingly. The positioning guide post 425 moves in the second inclined groove 303. The positioning guide post 425 is provided on the push-pull sleeve 421 and drives the push-pull sleeve 421 to move. The second inclined groove 303 has a trajectory in the axial direction on the valve body 3, so that the positioning guide post 425 and the push-pull sleeve 421 move axially, thereby opening and closing the valve. The open steel ring 305 limits the axial displacement of the rotating sleeve 431, and converts the rotational motion into axial motion through the positioning guide post 435 and the push-pull sleeve 421 to achieve the opening and closing of the valve.

[0072] In summary, the present invention has been made into an actual sample and tested many times as described in the specification and the illustrated content. From the test results, it can be proved that the present invention can achieve its intended purpose, and its practical value is beyond doubt. The above embodiments are only used to illustrate the present invention for convenience, and do not impose any formal restrictions on the present invention. Any person with ordinary knowledge in the relevant technical field, without departing from the technical features of the present invention, makes local changes or modifications to the equivalent embodiments using the technical content disclosed in the present invention, and without departing from the technical feature content of the present invention, still belongs to the scope of the technical features of the present invention.

Claims

1. A valve, comprising a valve body (3), characterized in that: The valve body (3) is provided with a multi-stage spool structure, and a valve switch (4) for opening and closing the multi-stage spool structure is provided on the valve body (3); The multi-stage spool structure includes a fixed spool (1) and at least one movable spool (2) stacked on the fixed spool (1). The fixed spool (1) has a plurality of first flow holes (101) to form a fluid passage for fluid flow with the unfolded movable spool (2). A spool rod (20) is provided on the movable spool (2), and by pushing and pulling the spool rod (20), the movable spool (2) axially reciprocates relative to the fixed spool (1) to close / open the fluid passage; The valve switch (4) includes a bidirectional screw (401), a screw seat (402) and a connecting member (403). The screw seat (402) is provided on the valve body (3). One end of the bidirectional screw (401) passes through the screw seat (402) and extends into the interior of the valve body (3), and the other end thereof is exposed outside the valve body (3) and connected with a handle (404). Movable nuts (405) are provided on the bidirectional threads of the bidirectional screw (401). The movable nuts (405) are movably connected with the connecting member (403) through push-pull pieces (406), and the connecting member (403) is connected with the spool rod (20); The valve switch (4) includes a radial elastic ring (422) and an inner rotating sleeve (423). A slotted guide post (4221) is provided on the radial elastic ring (422) and connected to the inner wall of the inner rotating sleeve (423); A guide post fixing ring (4231) is provided inside the inner rotating sleeve (423). The radial elastic ring (422) is encapsulated in the guide post fixing ring (4231), and the slotted guide post (4221) passes through a through hole in the side wall of the guide post fixing ring (4231) and abuts against the inner wall of the inner rotating sleeve (423).

2. The valve according to claim 1, wherein: The movable spool (2) includes a first spool (21), a second spool (22) and a third spool (23) that are stacked and axially unfolded. A plurality of second flow holes (211) and third flow holes (221) are provided on the first spool (21) and the second spool (22). The spool rod (20) on the third spool (23) passes through the first spool (21) and the second spool (22) and extends outside the fixed spool (1).

3. The valve according to claim 2, characterized in that: First receiving grooves (201), second receiving grooves (202) and third receiving grooves (203) are respectively provided on the fixed spool (1), the first spool (21) and the second spool (22). When the first spool (21), the second spool (22) and the third spool (23) are stacked on the fixed spool (1), they are respectively received in the first receiving groove (201), the second receiving groove (202) and the third receiving groove (203).

4. The valve according to claim 3, characterized in that: Sealing grooves (24) and sealing members (25) are provided on the outer peripheries of the first spool (21), the second spool (22) and the third spool (23).

5. The valve according to claim 1, characterized in that: A handle fixing seat (4021) is provided on the screw seat (402), and the handle (404) is provided on the handle fixing seat (4021) through a handle rod (4022).

6. The valve according to claim 1, characterized in that: A ratchet sleeve (4023) and a movable pawl (4024) are provided on the screw base (402), and the movable pawl (4024) is connected in cooperation with the ratchet teeth on the ratchet sleeve (4023).

7. The valve according to claim 1, characterized in that: The valve switch (4) includes a cylinder (411), an air pipe (412), a piston (413) and a piston rod (414). The cylinder (411) is fixed on the fixed valve core (1). One end face of the piston (413) is connected to the valve core rod (20) of the third valve core (23). One end of the piston rod (414) extends out of the cylinder (411) and is connected to a return sleeve (415). A return spring (416) is provided between the return sleeve (415) and the cylinder (411). One end of the air pipe (412) is connected to the rodless cavity of the cylinder (411), and the other end is connected to an air valve (417) provided on the outer wall of the valve body (3).

8. The valve according to claim 1, characterized in that: The valve switch (4) includes a push-pull sleeve (421) and an outer rotating sleeve (424). The side wall of the push-pull sleeve (421) is provided with a first inclined groove (4211), and a connecting structure is arranged on the end face and connected to the valve core rod (20). A radial elastic ring (422) is sleeved on the inner wall of the push-pull sleeve (421). An inner rotating sleeve (423) is sleeved on the outer wall of the push-pull sleeve (421). The inclined groove guide post (4221) on the radial elastic ring (422) passes through the first inclined groove (4211) and is connected to the inner wall of the inner rotating sleeve (423). The outer rotating sleeve (424) is sleeved outside the valve body (3) and is connected to the inner rotating sleeve (423) to drive the inner rotating sleeve (423) and the radial elastic ring (422) to rotate, so that the inclined groove guide post (4221) moves in the first inclined groove (4211) to push the push-pull sleeve (421) to move axially.

9. The valve according to claim 1, characterized in that: A straight groove (301) and a positioning hole (302) are provided on the valve body (3). A positioning guide post (425) and a positioning spring (426) are provided between the inner rotating sleeve (423) and the outer rotating sleeve (424). When the outer and inner rotating sleeves (424, 423) are rotated, the positioning guide post (425) moves in the straight groove (301). When the positioning guide post (425) is positioned in the positioning hole (302), the inner and outer rotating sleeves (423, 424) are in the rotated-in-place state.

10. The valve according to claim 1, wherein: The valve switch (4) includes a rotating sleeve (431), a sealing rotating sleeve (432) and a push-pull sleeve (421). One end face of the push-pull sleeve (421) is connected to the valve core rod (20) of the third valve core (23). Mutually cooperating inclined push surfaces (433) are provided on the contact end faces of the sealing rotating sleeve (432) and the push-pull sleeve (421). The rotating sleeve (431) and the sealing rotating sleeve (432) are respectively arranged on the outer wall and the inner wall of the valve body (3), and a positioning spring (426) and a positioning guide post (425) are provided therebetween.

11. The valve according to claim 10, characterized in that: A straight groove (301) and a positioning hole (302) are provided on the side wall of the valve body (3). When the rotating sleeve (431) rotates, the positioning guide post (425) moves in the straight groove (301). When the positioning guide post (425) is positioned in the positioning hole (302), the rotating sleeve (431) rotates in place.

12. The valve according to claim 1, wherein: The valve switch (4) includes a push-pull sleeve (421) and a rotating sleeve (431). One end face of the push-pull sleeve (421) is connected to the valve core rod (20) of the third valve core (23). A second inclined groove (303) is provided on the valve body (3). A positioning spring (426) and a positioning guide post (425) are provided between the push-pull sleeve (421) and the rotating sleeve (431). A long strip protrusion (4311) is provided on the rotating sleeve (431). The positioning guide post (425) passes through the second inclined groove (303) and abuts against the inner wall of the long strip protrusion (4311) of the rotating sleeve (431).

13. The valve according to claim 12, characterized in that: Concave rings (304) are provided on the valve body (3) at both ends of the second inclined groove (303). An open steel ring (305) is provided on the concave ring (304). The open steel ring (305) abuts against the two open edges of the rotating sleeve (431).

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