阅读说明：本技术 一种多级阀芯结构及具有该结构的阀门 (Multi-stage valve core structure and valve with same ) 是由 邱强生 林根发 于 2020-07-03 设计创作，主要内容包括：本发明公开了一种多级阀芯结构,包括固定阀芯、层叠设在固定阀芯上的至少一个活动阀芯,固定阀芯上具有多个第一流通孔与展开的活动阀芯形成供流体流通的流体通道,活动阀芯上设有阀芯杆并通过阀芯杆的推拉,使活动阀芯可相对于固定阀芯的轴向往复移动以封闭/开启所述流体通道。一种具有该多级阀芯结构的阀门,包括阀体,阀体内设有上述的多级阀芯结构,阀体上设有用于启闭所述多级阀芯结构通断的阀门开关。通过上述方式,阀芯层叠设置,推拉阀芯杆使得活动阀芯轴向运动形成流体通道及叠设在固定阀芯上密封流体通道,流体压力作用使阀芯单向密封具有自密封效果；采用多种阀门开关控制阀芯结构的启闭,动作方式多样、可靠,操作快捷。(The invention discloses a multi-stage valve core structure, which comprises a fixed valve core and at least one movable valve core stacked on the fixed valve core, wherein a plurality of first flow through holes are formed in the fixed valve core, a fluid channel for fluid to flow is formed by the unfolded movable valve core, a valve core rod is arranged on the movable valve core, and the movable valve core can axially reciprocate relative to the fixed valve core to close/open the fluid channel by pushing and pulling the valve core rod. The valve with the multi-stage valve core structure comprises a valve body, wherein the multi-stage valve core structure is arranged in the valve body, and a valve switch for opening and closing the multi-stage valve core structure is arranged on the valve body. Through the mode, the valve cores are arranged in a stacked mode, the valve core rod is pushed and pulled to enable the movable valve core to move axially to form a fluid channel and the fluid channel is stacked on the fixed valve core to seal the fluid channel, and the valve core is sealed in a one-way mode under the action of fluid pressure to achieve a self-sealing effect; the valve core structure is controlled to be opened and closed by adopting various valve switches, the action mode is various and reliable, and the operation is rapid.)

1. A multistage case structure which characterized in that: the movable valve core (2) is arranged on the movable valve core (2) and can axially reciprocate relative to the fixed valve core (1) to close/open the fluid channel, and the movable valve core (2) is pushed and pulled by the valve core rod (20).

2. The multi-stage valve cartridge structure of claim 1, wherein: the movable valve core (2) comprises a first valve core (21), a second valve core (22) and a third valve core (23), wherein the first valve core (21), the second valve core (22) and the third valve core (23) can be mutually stacked and axially unfolded, a plurality of second through holes (211) and third through holes (221) are formed in the first valve core (21) and the second valve core (22), and a valve core rod (20) on the third valve core (23) penetrates through the first valve core (21) and the second valve core (22) and extends out of the outer side of the fixed valve core (1).

3. The multi-stage valve cartridge structure of claim 2, wherein: the fixed valve core (1), the first valve core (21) and the second valve core (22) are respectively provided with a first containing groove (201), a second containing groove (202) and a third containing groove (203), and the first valve core (21), the second valve core (22) and the third valve core (23) are respectively contained in the first containing groove (201), the second containing groove (202) and the third containing groove (203) when being stacked on the fixed valve core (1).

4. The multi-stage spool structure of claim 3, wherein: and the outer peripheries of the first valve core (21), the second valve core (22) and the third valve core (23) are provided with a sealing groove (24) and a sealing element (25).

5. A valve comprising a valve body (3), characterized in that: the valve body (3) is internally provided with the multi-stage valve core structure according to any one of claims 1 to 4, and the valve body (3) is provided with a valve switch (4) for opening and closing the multi-stage valve core structure.

6. The valve of claim 5, wherein: the valve switch (4) comprises a bidirectional screw (401), a screw seat (402) and a connecting piece (403), the screw seat (402) is arranged on the valve body (3), one end of the bidirectional screw (401) penetrates through the screw seat (402) and extends into the valve body (3), the other end of the bidirectional screw is exposed out of the valve body (3) and is connected with a handle (404), a movable nut (405) is arranged on a bidirectional thread of the bidirectional screw (401), the movable nut (405) is movably connected with the connecting piece (403) through a push-pull sheet (406), and the connecting piece (403) is connected with a valve core rod (20) of the third valve core (23).

7. The valve of claim 6, wherein: the handle fixing seat (4021) is arranged on the screw rod seat (402), and the handle (404) is arranged on the handle fixing seat (4021) through a handle rod (4022).

8. The valve of claim 6, wherein: the screw rod seat (402) is provided with a ratchet sleeve (4023) and a movable pawl (4024), and the movable pawl (4024) is connected with a ratchet on the ratchet sleeve (4023) in a matching manner.

9. The valve of claim 5, wherein: valve switch (4) include cylinder (411), trachea (412), piston (413) and piston rod (414), cylinder (411) are fixed on fixed case (1), a terminal surface of piston (413) links to each other with case pole (20) of third case (23), the one end of piston rod (414) stretches out cylinder (411) external connection reset sleeve (415), be equipped with reset spring (416) between reset sleeve (415) and cylinder (411), the one end of trachea (412) is connected the pole chamber that has of cylinder (411), the pneumatic valve (417) of locating on valve body (3) outer wall are connected to the other end.

10. The valve of claim 5, wherein: the valve switch (4) comprises a push-pull sleeve (421), a radial elastic ring (422), an inner rotary sleeve (423) and an outer rotary sleeve (424), the side wall of the push-pull sleeve (421) is provided with a first inclined groove (4211), the end face of the push-pull sleeve is provided with a connecting structure connected with a valve core rod (20) of a third valve core (23), 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), an inclined groove guide post (4221) is arranged on the radial elastic ring (422) and penetrates through the first inclined groove (4211) to be connected with the inner wall of an inner rotating sleeve (423), the outer rotating sleeve (424) is sleeved outside the valve body (3) and connected with the inner rotating sleeve (423) to drive the inner rotating sleeve (423) and the radial elastic ring (422) to rotate, and the inclined groove guide post (4221) moves in the first inclined groove (4211) to.

11. The valve of claim 10, wherein: the inner rotating sleeve (423) is internally provided with a guide pillar fixing ring (4231), the radial elastic ring (422) is packaged in the guide pillar fixing ring (4231), and the chute guide pillar (4221) penetrates through a through hole in the side wall of the guide pillar fixing ring (4231) and abuts against the inner wall of the inner rotating sleeve (423).

12. The valve of claim 11, wherein: the valve body (3) is provided with a straight groove (301) and a positioning hole (302), a positioning guide pillar (425) and a positioning spring (426) are arranged between the inner rotary sleeve (423) and the outer rotary sleeve (424), when the outer rotary sleeve and the inner rotary sleeve (424 and 423) are rotated, the positioning guide pillar (425) moves in the straight groove (301), and when the positioning guide pillar (425) is positioned in the positioning hole (302), the inner rotary sleeve and the outer rotary sleeve (423 and 424) are in a rotating and positioning state.

13. The valve of claim 5, wherein: the valve switch (4) comprises 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 with a valve core rod (20) of a third valve core (23), an inclined push surface (433) which is matched with each other is arranged on the contact end face 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 pillar (425) are arranged between the rotating sleeve (431) and the sealing rotating sleeve (432).

14. The valve of claim 13, wherein: 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), and when the positioning guide post (425) is positioned in the positioning hole (302), the rotating sleeve (431) rotates in place.

15. The valve of claim 5, wherein: the valve switch (4) comprises a push-pull sleeve (421) and a rotary sleeve (431), one end face of the push-pull sleeve (421) is connected with a valve core rod (20) of a third valve core (23), a second chute (303) is arranged on the valve body (3), a positioning spring (426) and a positioning guide pillar (425) are arranged between the push-pull sleeve (421) and the rotary sleeve (431), a long-strip convex part (4311) is arranged on the rotary sleeve (431), and the positioning guide pillar (425) penetrates through the second chute (303) and abuts against the inner wall of the long-strip convex part (4311) of the rotary sleeve (431).

16. The valve of claim 15, wherein: be located and be equipped with concave ring (304) on the valve body (3) at second chute (303) both ends, be equipped with opening steel ring (305) on concave ring (304), opening steel ring (305) support on two opening edges of rotating sleeve (431).

Technical Field

The invention relates to the technical field of valves, in particular to a multi-stage valve core structure and a valve with the same.

Background

The valve is a control part in a fluid conveying system and has the functions of stopping, adjusting, guiding, preventing counter flow, stabilizing pressure, shunting or overflowing and relieving pressure and the like. The valve generally comprises a valve core, a valve body and a switch for opening the valve, wherein a channel for fluid to flow is arranged on the valve body, and the valve is opened and closed through the switch, so that the fluid flows in and is disconnected from the valve body. However, in the prior art, when the valve core controls the on-off of the valve in the valve body, the valve core is structured as a valve flap, and external force is applied to press the valve flap down to compress an inlet of the valve body or rotate the valve flap, so that the circular periphery of the rotating valve flap is in contact seal with the inner side wall of the valve body to close the valve. Valves of conventional construction in the prior art, such as butterfly valves, have closing members (flaps or stacks) which are discs that rotate about a valve axis to open and close. When the valve is closed by the common butterfly valve, the periphery of the closing member and the inner wall of the valve body are easily abraded depending on the fixing action of the valve shaft in the using process, and the sealing effect of the valve is influenced.

Disclosure of Invention

The invention aims to provide a multi-stage valve core structure and a valve with the same, wherein a movable valve core is stacked, the movable valve core axially moves to form a fluid channel and is stacked on a fixed valve core to seal the fluid channel by pushing and pulling a valve core rod, and the valve core is unidirectionally sealed by the action of fluid pressure to have a good self-sealing effect; the valve core structure is controlled to be opened and closed through various valve switches, the action mode is various and reliable, and the operation is rapid.

In order to solve the technical problems, the technical scheme provided by the invention is as follows: a multi-stage valve core structure comprises a fixed valve core and at least one movable valve core stacked on the fixed valve core, wherein a plurality of first flow through holes are formed in the fixed valve core, a fluid channel for fluid to flow is formed by the unfolded movable valve core, a valve core rod is arranged on the movable valve core, and the movable valve core can axially reciprocate relative to the fixed valve core to close/open the fluid channel by pushing and pulling the valve core rod.

Due to the adoption of the technical scheme, the movable valve core is pushed by the valve core rod, so that after the movable valve core moves and expands in the axial direction, the movable valve core is separated from the first flow through hole to form a fluid channel; when the movable valve core moves axially towards the direction of the fixed valve core, the movable valve core layer is overlapped on the fixed valve core and seals the flow through hole, so that the valve core of the valve is closed; when the valve is closed, the fluid has static pressure on the movable valve core, the movable valve core fixes the valve core in a one-way sealing mode, the valve core has a self-sealing function under the action of the static pressure of the fluid, and the sealing performance is improved.

In the above multistage valve core structure, the movable valve core includes a first valve core, a second valve core and a third valve core that can be stacked and axially expanded, the first valve core and the second valve core are provided with a plurality of second flow through holes and third flow through holes, and a valve core rod on the third valve core passes through the first valve core and the second valve core and extends out of the outer side of the fixed valve core. When the valve core rod on the third valve core is pushed by external force, the third valve core, the second valve core and the first valve core sequentially axially move to leave the first flow through hole, the second flow through hole, the third flow through hole and the flow hole on the fixed valve core form a fluid channel for conveying fluid, and when the first valve core, the second valve core and the third valve core are sequentially stacked on the fixed valve core, the movable valve core sequentially seals the third flow through hole, the second flow through hole and the first flow through hole.

In the above multi-stage valve core structure, the fixed valve core, the first valve core and the second valve core are respectively provided with a first accommodating groove, a second accommodating groove and a third accommodating groove, and the first valve core, the second valve core and the third valve core are respectively accommodated in the first accommodating groove, the second accommodating groove and the third accommodating groove when stacked on the fixed valve core. When the valve core is stacked, the first valve core, the second valve core and the third valve core are contained in the containing grooves, so that the structure is more compact, and the occupied space is small.

In the multi-stage valve core structure, the outer peripheries of the first valve core, the second valve core and the third valve core are provided with the sealing grooves and the sealing elements. The sealing element is arranged in the sealing groove and used for sealing the side wall of the containing groove in a stacking state, and the first valve core, the second valve core and the third valve core seal the first flow through hole, the second flow through hole and the third flow through hole.

In order to solve the above technical problems, the present invention further provides another technical solution: a valve comprises a valve body, wherein the multi-stage valve core structure in any one of the technical schemes is arranged in the valve body, and a valve switch for opening and closing the multi-stage valve core structure is arranged on the valve body. The fixed valve core is arranged in the valve core, and the valve core rod of the valve switch connected with the third valve core drives the valve core rod to push and pull the movable valve core to act.

The valve switch comprises 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 penetrates through the screw seat and extends into the valve body, the other end of the bidirectional screw is exposed out of the valve body and is connected with a handle, a movable nut is arranged on a bidirectional thread of the bidirectional screw and is movably connected with the connecting piece through a push-pull piece, and the connecting piece is connected with a valve core rod of the third valve core. When the bidirectional screw rotates, the movable nut moves on the screw in the same direction or in the reverse direction, the connecting piece is pushed by the push-pull piece to reciprocate along the axial direction in the valve body, so that the valve core rod on the third valve core is pushed and pulled, the multistage valve core structure acts to open/close the valve body, the screw has a self-locking function, and the opening degree of the valve can be determined stably in any state.

In the valve, the screw rod seat is provided with the handle fixing seat, and the handle is arranged on the handle fixing seat through the handle rod. The handle rod is used for connecting a handle, the handle is connected with the bidirectional screw rod and pulls the bidirectional screw rod to rotate so as to drive the movable nut to move on the screw rod, and then the valve core rod is pushed and pulled through the push-pull sheet and the connecting piece so as to open or close the valve.

In the valve, the screw rod seat is provided with the ratchet sleeve and the movable pawl, and the movable pawl is connected with the ratchet on the ratchet sleeve in a matching way. When the handle drives the bidirectional screw to rotate for 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 degree, and the valve core can be used for controlling the flow of the conveyed fluid.

The valve switch comprises the cylinder, the air pipe, the piston and the piston rod, the cylinder is fixed on the fixed valve core, one end face of the piston is connected with the valve core rod of the third valve core, one end of the piston rod extends out of the cylinder and is connected with the reset sleeve, the reset spring is arranged between the reset sleeve and the cylinder, one end of the air pipe is connected with the rod cavity of the cylinder, and the other end of the air pipe is connected with the air valve arranged on the outer wall of the valve body. The compressed gas is communicated through the gas pipe to drive the piston rod and the piston to reciprocate in the cylinder, so that the valve is opened or closed, and automatic electrical control can be realized.

The valve switch comprises a push-pull sleeve, a radial elastic ring, an inner rotary sleeve and an outer rotary sleeve, wherein a first chute is arranged on the side wall of the push-pull sleeve, a connecting structure is arranged on the end face of the push-pull sleeve and connected with a valve core rod of a third valve core, the radial elastic ring is sleeved on the inner wall of the push-pull sleeve, the inner rotary sleeve is sleeved on the outer wall of the push-pull sleeve, a chute guide post is arranged on the radial elastic ring and penetrates through the first chute to be connected with the inner wall of the inner rotary sleeve, and the outer rotary sleeve is sleeved outside the valve body and connected with the inner rotary sleeve to drive the inner rotary sleeve and the radial elastic ring to rotate so that the chute guide post moves in the first. The outer rotating sleeve drives the inner rotating sleeve to rotate, so that the chute guide post rotates and moves in a chute on the push-pull sleeve, the push-pull sleeve is pushed to move in the axial direction, the valve core rod of a third valve core connected with the outer rotating sleeve is driven to move in the axial direction, the valve core can be closed/opened in different rotating directions by operating the outer rotating sleeve on the valve body, the action is reliable, the opening degree of the valve core can be freely opened, and further the flow is controlled.

In the valve, the guide pillar fixing ring is arranged in the inner rotating sleeve, the radial elastic ring is packaged in the guide pillar fixing ring, and the chute guide pillar penetrates through the through hole in the side wall of the guide pillar fixing ring and abuts against the inner wall of the inner rotating sleeve. The fixed ring of guide pillar cover is in the periphery of radial elastic ring, and balanced radial elastic ring prevents to warp when rotatory.

In the valve, the valve body is provided with the straight groove and the positioning hole, the positioning guide pillar and the positioning spring are arranged between the inner rotating sleeve and the outer rotating sleeve, when the outer rotating sleeve and the inner rotating sleeve are rotated, the positioning guide pillar moves in the straight groove, and when the positioning guide pillar is positioned in the positioning hole, the inner rotating sleeve and the outer rotating sleeve are in a rotating in-place state. The positioning guide post drives the inner rotating sleeve to rotate when being used for rotating the outer rotating sleeve, when the outer rotating sleeve rotates to the position, the positioning spring acts to enable the positioning guide post to penetrate through the positioning hole, the outer rotating sleeve cannot continue to rotate at the moment, the positioning guide post can continue to rotate after being pressed into the positioning hole, and the position of the positioning hole can be set as a position point of the valve core in an opening or closing state.

In the valve, the valve switch comprises the rotary sleeve, the sealed rotary sleeve and the push-pull sleeve, one end face of the push-pull sleeve is connected with the valve core rod of the third valve core, the contact end face of the sealed rotary sleeve and the push-pull sleeve is provided with the inclined push surfaces which are matched with each other, the rotary sleeve and the sealed rotary sleeve are respectively sleeved on the outer wall and the inner wall of the valve body, and the positioning spring and the positioning guide pillar are arranged between the rotary sleeve and the sealed rotary sleeve. The rotating sleeve rotates to drive the sealing rotating sleeve to rotate through the positioning spring and the positioning guide pillar, the push-pull sleeve is far away from the sealing rotating sleeve or close to the sealing rotating sleeve through the inclined push surface between the sealing rotating sleeve and the push-pull sleeve, the valve core rod is further driven to axially move, and then the valve core is opened/closed.

In the valve, the side wall of the valve body is provided with the straight groove and the positioning hole, the positioning guide pillar moves in the straight groove when the rotating sleeve rotates, and the rotating sleeve rotates to the position when the positioning guide pillar is positioned in the positioning hole. The rotary sleeve drives the sealing rotary sleeve to rotate through the positioning guide pillar, the rotary sleeve cannot rotate when the positioning guide pillar penetrates out of the positioning hole, and the rotary sleeve can continue to rotate when the positioning guide pillar is pressed to be retracted into the valve body so as to position the rotary position of the rotary sleeve.

The valve switch comprises a push-pull sleeve and a rotary sleeve, one end face of the push-pull sleeve is connected with a valve core rod of the third valve core, a second chute is arranged on the valve body, a positioning spring and a positioning guide pillar are arranged between the push-pull sleeve and the rotary sleeve, a strip-shaped convex is arranged on the rotary sleeve, and the positioning guide pillar penetrates through the second chute and abuts against the inner wall of the strip-shaped convex of the rotary sleeve. When the rotating sleeve rotates, the inner wall of the long strip protruding outwards drives the push-pull sleeve to rotate through the positioning guide pillar, the positioning guide pillar moves in the chute on the valve body, the positioning guide pillar moves axially, the push-pull sleeve is driven to move axially to drive the valve core rod to move, and the valve core is closed/opened.

In the valve, the valve bodies at the two ends of the second chute are provided with the concave rings, the concave rings are provided with the opening steel rings, and the opening steel rings abut against the two opening edges of the rotary sleeve. The opening steel rings limit the position of the rotating sleeve between the opening steel rings to rotate.

The beneficial effects obtained by the invention are as follows:

1. the hydrostatic pressure formula of the valve core: f is P V, and case stress value and pressure area are linear relation, through being divided into the multistage with the case structure, and the case pressure area that the single was opened reduces, and the hydrostatic pressure that the case received reduces, effectively reduces the degree of difficulty that the case was opened when using to heavy-calibre pipeline.

2. The sealing performance is better, when closing the case, the case receives fluid static pressure effect one-way seal, uses piston sealing member, and pressure is big more, and the leakproofness is better, compares with ordinary valve and has self-sealing effect.

3. The multistage valve core structure is arranged in the valve body, can be combined with various valve switch structures to drive the valve core to close and open, has reliable action, can open the valve core in any state and controls the flow of the valve body.

4. The multistage valve core structure is arranged in the valve body, the stacked third valve core, the stacked second valve core and the stacked first valve core are accommodated through the accommodating grooves, the sealing grooves and the sealing pieces are arranged on the periphery of each valve core and used for sealing the side walls of the accommodating grooves, and the valve core structure seals the first flow through holes, the second flow through holes and the third flow through holes, so that the valve cores are compact in structure and good in sealing effect when stacked.

Drawings

FIG. 1 is a schematic view of a stacked configuration of a multi-stage cartridge configuration according to an embodiment of the present invention;

FIG. 2 is a schematic view of an expanded configuration of a multi-stage valve cartridge configuration according to an embodiment of the present invention;

FIG. 3 is an exploded view of a multi-stage valve cartridge according to an embodiment of the present invention;

FIG. 4 is a schematic structural diagram of an external appearance of an embodiment of the valve of the present invention;

FIG. 5 is a schematic view of the expanded configuration of the first embodiment of the valve of the present invention;

FIG. 6 is a schematic view of the valve switch structure of the first embodiment of the valve of the present invention;

FIG. 7 is a schematic view of an exploded view of the valve switch of the first embodiment of the valve of the present invention;

FIG. 8 is a perspective cutaway view of a second embodiment of the valve of the present invention;

FIG. 9 is a cut-away perspective view of a third embodiment of the valve of the present invention;

fig. 10 is an exploded perspective view of a third embodiment of the valve of the present invention;

FIG. 11 is a side sectional view of a third embodiment of the valve of the present invention;

FIG. 12 is a cutaway view of the valve closure structure of the fourth embodiment of the valve of the present invention;

FIG. 13 is a cut-away view of the valve opening structure of the fourth embodiment of the valve of the present invention;

fig. 14 is an exploded view of a fourth embodiment of the valve of the present invention;

FIG. 15 is a schematic perspective view of a valve body of a fourth embodiment of the valve of the present invention;

FIG. 16 is a cutaway view of the valve closure structure of the fifth embodiment of the valve of the present invention;

FIG. 17 is a cut-away view of the valve opening structure of the fifth embodiment of the valve of the present invention;

fig. 18 is an exploded view of a fifth embodiment of the valve of the present invention.

Description of reference numerals: 1 fixed valve core, 101 first through hole, 2 movable valve core, 201 first containing groove, 202 second containing groove, 203 third containing groove, 20 valve core rod, 21 first valve core, 22 second valve core, 23 third valve core, 24 sealing groove, 25 sealing element, 3 valve body, 301 straight groove, 302 positioning hole, 303 second chute, 304 concave ring, 305 opening steel ring, 4 valve switch, 401 two-way screw, 402 screw seat, 403 connecting piece, 404 handle, 405 movable nut, 406 push-pull plate, 4021 handle fixing seat, 4022 handle rod, 4023 ratchet sleeve, 4024 movable pawl, 411 cylinder, 412 air pipe, 413 piston, 414 piston rod, 415 reset sleeve, 416 reset 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 chute, 4221 chute, 4231 guide post, 4231 rotating sleeve, 432 sealing rotary sleeve, 433 inclined push surface, 4311 long strip convex.

Detailed Description

The present invention provides a multi-stage valve core structure and a valve having the same, and the present invention will be further described with reference to different embodiments of the multi-stage valve core structure and the valve.

Multi-stage valve cartridge structural embodiment

Referring to fig. 1 to 3, a multi-stage valve core structure includes a fixed valve core 1 and at least one movable valve core 2 stacked on the fixed valve core 1, the fixed valve core 1 has a plurality of first flow through holes 101 to form a fluid channel for fluid to flow with the unfolded movable valve core 2, the movable valve core 2 is provided with a valve core rod 20, and the movable valve core 2 can move back and forth in an axial direction relative to the fixed valve core 1 by pushing and pulling the valve core rod 20 to close/open the fluid channel. The process that the movable valve core 2 moves upwards along the axial direction relative to the fixed valve core 1 to open the fluid channel is as follows: the laminated movable valve core 2 leaves the fixed valve core 1, and leaves the first flow through hole 101 on the fixed valve core 1, and the fluid enters the interval between the movable valve core 2 and the fixed valve core 1 and flows out from the first flow through hole 101 to form the fluid channel for conveying the fluid; the process that the movable valve core 2 moves upwards along the axial direction relative to the fixed valve core 1 to close the fluid channel is as follows: the unfolded movable valve core 2 approaches towards the direction of the fixed valve core 1 until the first flow through hole 101 is attached and sealed, and at the moment, the fluid is blocked, so that a three-dimensional channel is closed.

In this embodiment, the movable valve core 2 includes a first valve core 21, a second valve core 22 and a third valve core 23 which can be stacked and axially expanded, a plurality of second through holes 211 and third through holes 221 are provided on the first valve core 21 and the second valve core 22, and a valve core rod 20 on the third valve core 23 passes through the first valve core 21 and the second valve core 22 and extends out of the fixed valve core 1.

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

The outer peripheries of the first spool 21, the second spool 22, and the third spool 23 are provided with a seal groove 24 and a seal 25.

Referring to fig. 4, the valve includes a valve body 3, the multi-stage valve core structure according to the above embodiment is provided in the valve body 3, and a valve switch 4 for opening and closing the multi-stage valve core structure is provided on the valve body 3. The fixed valve core 1 of the multistage valve core structure is fixed on the inner wall of the valve body 3, fluid input ports and fluid output ports are arranged at two ends of the valve 3, and when the movable valve core 2 is driven by external force to open the valve, fluid enters the valve 3 from the input ports and flows out from the output ports. The fluid has a pressure of flow to the first, second and third spools 21, 22, 23 and a static pressure when the valve is closed.

Different embodiments of a valve with a multi-stage valve core structure according to the present invention will be further described with reference to the accompanying drawings and specific embodiments.

Valve embodiment one

Referring to fig. 5, 6 and 7, the valve switch 4 includes a two-way screw 401, a screw seat 402 and a connector 403, the screw seat 402 is disposed on the valve body 3, one end of the two-way screw 401 passes through the screw seat 402 and extends into the valve body 3, the other end of the two-way screw is exposed outside the valve body 3 and is connected with a handle 404, a movable nut 405 is disposed on the two-way thread of the two-way screw 401, the movable nut 405 is movably connected with the connector 403 through a push-pull plate 406, and the connector 403 is connected with the valve core rod 20 of the third valve core 23.

The screw rod seat 402 is provided with a handle fixing seat 4021, and the handle 404 is arranged on the handle fixing seat 4021 through a handle rod 4022.

The screw rod seat 402 is provided with a ratchet sleeve 4023 and a movable pawl 4024, and the movable pawl 4024 is matched and connected with a ratchet on the ratchet sleeve 4023.

The handle 404 pulls the bidirectional screw 401 to rotate, the movable nuts 405 follow the threads on the bidirectional threads of the bidirectional screw 401, the two movable nuts 405 move simultaneously along the direction of the center or two ends of the bidirectional screw 401, the two push-pull plates 406 are driven to move by the movable nuts 405 movably connected with the push-pull plates 406, the other ends of the push-pull plates 406 are movably connected with the connecting piece 403, such as hinged connection and pin connection, so that the connecting piece 403 reciprocates axially along the inner cavity of the valve body 3, and the valve core rod 20 on the third valve core 23 connected with the connecting piece is driven to sequentially push and pull the third valve core 23, the second valve core 22 and the first valve core 21, so that a fluid channel is formed or the fluid channel is closed, and the purpose of opening the valve core is achieved.

Valve embodiment two

Referring to fig. 8, 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 surface of the piston 413 is connected with 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 with a return sleeve 415, a return spring 416 is arranged between the return sleeve 415 and the cylinder 411, one end of the air pipe 412 is connected with the rod cavity of the cylinder 411, and the other end of the air pipe 412 is connected with an air valve 417 arranged on the outer wall of the valve body.

In specific implementation, compressed gas is input to drive 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 move, so as to sequentially open the third valve core 23, the second valve core 22 and the first valve core 21, and achieve the purpose of opening the valve, in the process, the return spring 416 is compressed, when the valve is closed, 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, the valve core rod 20 is driven to move axially, so that the third valve core 23, the second valve core 22 and the first valve core 21 are stacked on the fixed valve core 1, and the valve is closed.

Valve embodiment III

Referring to fig. 9, 10 and 11, the valve switch 4 includes a push-pull sleeve 421, a radial elastic ring 422, an inner rotary sleeve 423 and an outer rotary sleeve 424, a first inclined groove 4211 is formed in a side wall of the push-pull sleeve 421, a connection structure is formed on an end surface of the push-pull sleeve 421 to be connected to a valve core rod 20 of the third valve core 23, the radial elastic ring 422 is sleeved on an inner wall of the push-pull sleeve 421, the inner rotary sleeve 423 is sleeved on an outer wall of the push-pull sleeve 421, an inclined groove guide post 4221 is formed on the radial elastic ring 422 to penetrate through the first inclined groove 4211 to be connected to an inner wall of the inner rotary sleeve 423, the outer rotary sleeve 424 is sleeved outside the valve body 3 and connected to the inner rotary sleeve 423 to drive the inner rotary sleeve 423 and the radial elastic ring 422.

The inner rotating sleeve 423 is internally provided with a guide post fixing ring 4231, the radial elastic ring 422 is packaged in the guide post fixing ring 4231, and the chute guide post 4221 penetrates 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.

The valve body 3 is provided with a straight groove 301 and a positioning hole 302, a positioning guide pillar 425 and a positioning spring 426 are arranged between the inner rotary sleeve 423 and the outer rotary sleeve 424, when the outer rotary sleeve 424 and the inner rotary sleeve 423 are rotated, the positioning guide pillar 425 moves in the straight groove 301, and when the positioning guide pillar 425 is positioned in the positioning hole 302, the inner rotary sleeve 423 and the outer rotary sleeve 424 are in a rotating in-place state.

In the specific implementation of this embodiment, the outer rotating sleeve 424 is rotated to drive the inner rotating sleeve 423 to rotate, so that the inner rotating sleeve 423 drives the chute guide post 4221, the radial elastic ring 422 and the guide post fixing ring 4231 to rotate, the chute guide post 4221 moves in the first chute 4211 of the push-pull sleeve 421, and since the position of the chute guide post 4221 in the axial direction is unchanged during the rotation, the chute guide post 4221 has an axial thrust to the push-pull sleeve 421 when moving along the first chute 4211, so that the push-pull sleeve 421 moves axially in the valve body 3, and then the valve core rod 20 of the third valve core 23 is pushed and pulled, thereby achieving the purpose of opening or closing the valve.

Valve embodiment four

Referring to fig. 12, 13, 14 and 15, the valve switch 4 includes a rotary sleeve 431, a sealing rotary sleeve 432 and a push-pull sleeve 421, one end surface of the push-pull sleeve 421 is connected to the valve core rod 20 of the third valve core 23, an inclined push surface 433 is provided on the contact surface of the sealing rotary sleeve 432 and the push-pull sleeve 421, the rotary sleeve 431 and the sealing rotary sleeve 432 are respectively provided 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. The side wall of the valve body 3 is provided with a straight groove 301 and a positioning hole 302, the positioning guide 425 moves in the straight groove 301 when the rotating sleeve 431 rotates, and the rotating sleeve 431 rotates to the position when the positioning guide 425 is positioned in the positioning hole 302.

In the specific implementation process of this embodiment, the rotation of the rotating sleeve 431 drives the sealing rotating sleeve 432 to rotate, and the push-pull sleeve 421 is pushed by the inclined push surface 433 to move axially, so as to push the valve core rod 20 to expand the third valve core 23, the second valve core 22, and the first valve core 21, so as to form a fluid channel and then deliver fluid. The inclined pushing surface 433 is an inclined notch formed on a contact end surface between the push-pull sleeve 421 and the sealing rotary sleeve 432, when the valve is closed, the inclined notches are engaged with each other, when the valve is opened, the inclined notches are separated from each other, and when outer end portions of the two inclined notches are abutted, the valve is in a completely opened state.

Valve embodiment five

Referring to fig. 16, 17 and 18, the valve switch 4 includes a push-pull sleeve 421 and a rotary sleeve 431, one end surface of the push-pull sleeve 421 is connected to the valve core rod 20 of the third valve core 23, the valve body 3 is provided with a second inclined groove 303, a positioning spring 426 and a positioning guide pillar 425 are disposed between the push-pull sleeve 421 and the rotary sleeve 431, the rotary sleeve 431 is provided with a long protruding 4311, and the positioning guide pillar 425 passes through the second inclined groove 303 and abuts against an inner wall of the long protruding 4311 of the rotary sleeve 431. The valve body 3 at the two ends of the second chute 303 is provided with a concave ring 304, the concave ring 304 is provided with an opening steel ring 305, and the opening steel ring 305 abuts against the two opening edges of the rotating sleeve 431.

In this embodiment, when the rotating sleeve 431 rotates, the positioning guide pillar 425 inside the elongated protrusion 4311 rotates, the positioning guide pillar 425 moves in the second inclined groove 303, the positioning guide pillar 425 is disposed on the push-pull sleeve 421 and drives the push-pull sleeve 421 to move, the second inclined groove 303 has a track on the valve body 3 in the axial direction, so that the positioning guide pillar 425 and the push-pull sleeve 421 move in the axial direction, and the valve is opened and closed. The opening steel ring 305 limits the rotating sleeve 431 to move axially, and the rotating motion is converted into axial motion through the positioning guide column 435 and the push-pull sleeve 421, so that the valve is opened and closed.

In summary, the actual samples of the present invention are prepared according to the description and the drawings, and after a plurality of usage tests, the effect of the usage tests proves that the present invention can achieve the expected purpose, and the practical value is undoubted. The above-mentioned embodiments are only for convenience of illustration and not intended to limit the invention in any way, and those skilled in the art will be able to make equivalents of the features of the invention without departing from the technical scope of the invention.