CN214838485U - Pneumatic on-off valve - Google Patents

Abstract

The utility model relates to a pneumatic on-off valve belongs to valve technical field. This pneumatic on-off valve includes: the valve comprises a valve body, wherein a valve seat is arranged in the valve body, the valve seat divides an inner cavity of the valve body into a water inlet cavity and a water outlet cavity, and a valve seat conical valve port is arranged on the valve seat; the valve core assembly comprises a valve rod and a valve core, one end of the valve rod penetrates through the valve body in a sliding mode, the valve core is fixedly connected with the other end of the valve rod, a valve core conical valve port matched with the valve seat conical valve port is arranged on the valve core, and the water inlet cavity and the water outlet cavity are disconnected or communicated through the contact and separation of the valve seat conical valve port and the valve core conical valve port; the output end of the air cylinder component is in transmission connection with one end of the valve rod, and the air cylinder component is connected to the valve body. The pneumatic on-off valve has the advantages of high sealing performance, long service life and the like.

Description

Pneumatic on-off valve

Technical Field

The utility model belongs to the technical field of the valve, concretely relates to pneumatic on-off valve.

Background

The steam in the steel rolling workshop is generally used for blowing off the scale on the surface of the sheet, washing a gas pipeline, preserving heat of lubricating oil in winter, heating acid washing solution and a rinsing bath in an acid washing section, cooling a roller of a sheet rolling mill, atomizing heavy oil when burning the heavy oil and the like. The steam is required to be conveyed by adopting a steam pipeline, the steam pipeline is used for controlling the on-off of the steam, a pneumatic ball valve or a butterfly valve is generally adopted, and the steam-conveying.

However, in the case of the valve with high frequency such as purging iron scale on the surface of the steel plate, leakage occurs, meanwhile, the valve has short service life, the equipment maintenance cost is high, and the production is affected.

SUMMERY OF THE UTILITY MODEL

The utility model discloses a solve above-mentioned technical problem and provide a pneumatic on-off valve, it is high to have a sealing performance, advantages such as long service life reaches.

The utility model provides an above-mentioned technical problem's technical scheme as follows: a pneumatic on-off valve comprising:

the valve comprises a valve body, wherein a valve seat is arranged in the valve body, the valve seat divides an inner cavity of the valve body into a water inlet cavity and a water outlet cavity, and a valve seat conical valve port is arranged on the valve seat;

the valve core assembly comprises a valve rod and a valve core, one end of the valve rod penetrates through the valve body in a sliding mode, the valve core is fixedly connected with the other end of the valve rod, a valve core conical valve port matched with the valve seat conical valve port is arranged on the valve core, and the water inlet cavity and the water outlet cavity are disconnected or communicated through the contact and separation of the valve seat conical valve port and the valve core conical valve port;

the output end of the air cylinder component is in transmission connection with one end of the valve rod, and the air cylinder component is connected to the valve body.

The utility model has the advantages that: (1) through the matching of the cone valve port of the valve core and the cone valve port of the valve seat, the leakage in the valve can be prevented, and the sealing property of the valve is improved;

(2) the valve core is conveniently driven to contact or separate from the valve seat through the arranged cylinder assembly, so that the on-off of the valve body is realized, and the conveying of fluid is conveniently controlled;

(3) the pneumatic on-off valve has long service life, does not need excessive maintenance, reduces the maintenance cost of enterprises and improves the production efficiency.

On the basis of the technical scheme, the utility model discloses can also do following improvement.

Furthermore, the lower end of the valve core is of a cone structure, and a transition conical surface with a downward tip is arranged between the conical valve port of the valve core and the end part of the lower end of the valve core.

The beneficial effect of adopting the further scheme is that: the valve has the advantages that the impact when the valve is opened is favorably reduced, the positions of the valve core and the valve seat are favorably swept when the valve is opened at a small opening degree before the valve is closed, the risk that the valve core and the valve seat extrude particle impurities when the valve core and the valve seat are closed is reduced, and the risk of internal leakage is further reduced.

Furthermore, the top end of the valve body is provided with a through hole used for sliding out of the other end of the valve rod, the valve body is provided with a valve cover assembly used for sealing the through hole, the other end of the valve rod penetrates through the valve cover assembly in a sliding mode, and the air cylinder assembly is connected with the valve cover assembly.

The beneficial effect of adopting the further scheme is that: can seal the opening, improve the leakproofness, avoid appearing the leakage condition.

Further, the valve gap subassembly includes valve gap, packing seal assembly and gland, the other end of valve rod slides in proper order and passes the valve gap with gland, packing seal assembly is located the valve rod with gap department between the valve gap, gland with the connection can be dismantled to the valve gap, gland's lower extreme with packing seal assembly butt, through gland will packing seal assembly extrusion inflation.

The beneficial effect of adopting the further scheme is that: can realize the sealed of valve rod and valve gap junction through packing seal assembly, through the adjustable sealed decrement to packing seal assembly of gland nut that sets up, after sealed production wearing and tearing, can further screw up the extrusion, realize sealed compensation ability.

Further, a guide disc and a sleeve are arranged between the valve cover and the valve seat, the lower end of the sleeve is connected with the valve seat, a plurality of flow channel windows are arranged on the sleeve, the upper end of the sleeve is connected with the guide disc, the guide disc is connected with the valve body, and the other end of the valve rod penetrates through the guide disc in a sliding mode.

The beneficial effect of adopting the further scheme is that: the valve seat is convenient to fix.

Furthermore, the guiding disc with the valve body with the junction of valve gap all is equipped with the graphite gasket.

The beneficial effect of adopting the further scheme is that: the sealing performance of the connecting part of the guide disc, the valve body and the valve cover is improved.

Further, the air cylinder assembly comprises a support, an air cylinder and a position indicator, the bottom end of the support is connected with the valve body, the air cylinder is connected to the top end of the support, the position indicator is connected with the output end of the air cylinder, and the other end of the valve rod is connected with the position indicator.

The beneficial effect of adopting the further scheme is that: the cylinder is favorable for fixing the cylinder, and the cylinder conveniently drives the valve core to move up and down.

Further, the cylinder comprises a piston rod, a cylinder head, a cylinder barrel, a piston and a cylinder tail, the cylinder head is connected with one end of the cylinder barrel, the cylinder head is connected with the top end of the support, the cylinder tail is connected with the other end of the cylinder barrel, the piston is connected in the cylinder barrel in a sliding mode, one end of the piston rod is connected with the piston, the other end of the piston rod penetrates through the cylinder head in a sliding mode, and a guide sleeve is arranged at the joint of the piston rod and the cylinder head.

The beneficial effect of adopting the further scheme is that: the valve core can be driven to move up and down, and the valve can be opened or closed.

Further, a cylinder head air port communicated with the cylinder barrel is arranged on the cylinder head, and a cylinder tail air port communicated with the cylinder barrel is arranged on the cylinder tail.

The beneficial effect of adopting the further scheme is that: the piston is favorably communicated with an external air passage, and the piston is driven to move up and down.

Furthermore, the guide sleeve comprises a guide ring and a dust ring, and the guide ring and the dust ring are sleeved on the piston rod.

The beneficial effect of adopting the further scheme is that: the sealing performance is improved through the guide ring, and dust is prevented from entering the cylinder barrel through the dust ring.

Drawings

Fig. 1 is a schematic structural view of the pneumatic on-off valve of the present invention.

In the drawings, the components represented by the respective reference numerals are listed below:

1. a valve body; 11. a water inlet cavity; 12. a water outlet cavity; 2. a valve seat; 21. a valve seat cone valve port; 3. a sleeve; 31. a flow channel window; 4. a valve core assembly; 41. a valve core; 411. a valve core cone valve port; 42. a valve stem; 5. a guide plate; 6. a valve cover assembly; 61. a valve cover; 611. a packing seal assembly; 62. a spacer ring; 63. a round nut; 64. a sealing gland; 65. a gland nut; 7. a cylinder assembly; 71. a support; 72. a position indicator; 73. a travel indicator; 74. a cylinder; 741. a piston rod; 742. a guide sleeve; 742-1, a guide ring; 742-2, dustproof ring; 743. a cylinder head; 743-1, cylinder head port; 744. a cylinder barrel; 745. a gasket; 746. a piston; 746-1, piston seal ring; 747. locking the nut; 748. a cylinder tail; 748-1, cylinder exhaust port.

Detailed Description

The principles and features of the present invention are described below in conjunction with the following drawings, the examples given are only intended to illustrate the present invention and are not intended to limit the scope of the present invention.

Examples

As shown in fig. 1, the present embodiment provides a pneumatic on-off valve including: the valve comprises a valve body 1, a valve core assembly 4 and an air cylinder assembly 7.

The valve body 1 is internally provided with a valve seat 2, the valve seat 2 divides the inner cavity of the valve body 1 into a water inlet cavity 11 and a water outlet cavity 12, and the valve seat 2 is provided with a valve seat cone valve port 21. The valve core assembly 4 comprises a valve rod 42 and a valve core 41, one end of the valve rod 42 penetrates through the valve body 1 in a sliding mode, the valve core 41 is fixedly connected with the other end of the valve rod 42, a valve core conical valve opening 411 matched with the valve seat conical valve opening 21 is formed in the valve core 41, and the water inlet cavity 11 and the water outlet cavity 12 are disconnected or communicated through contact and separation of the valve seat conical valve opening 21 and the valve core conical valve opening 411. The output end of the air cylinder component 7 is connected with one end of the valve rod 42 in a transmission way, and the air cylinder component 7 is connected on the valve body 1.

Wherein, be equipped with the valve pocket in the valve body 1, can be used for the fluid to flow through, be equipped with the water inlet with water inlet cavity 11 intercommunication on the both ends of valve body respectively, the delivery port with delivery port cavity 12 intercommunication. Wherein the water inlet cavity 11 is used for fluid to enter, and the water outlet cavity 12 is used for fluid to flow out. The main body of the valve body 1 is of a sphere structure, and the inner cavity of the valve body 1 is of an S-shaped flow passage, so that the valve has the characteristic of small flow resistance.

Wherein, be equipped with the through-hole that is used for communicateing water inlet cavity 11 and delivery port cavity 12 on the disk seat 2, case 41 is used for cooperating with disk seat 2, and after case 41 and disk seat 2 contacted, case 41 closes the through-hole, with water inlet cavity 11 and delivery port cavity 12 disconnection, this pneumatic on-off valve was closed this moment. When the valve core 41 is separated from the valve seat 2, the through hole is opened to communicate the water inlet cavity 11 with the water outlet cavity 12, and at the moment, the pneumatic on-off valve is opened. Wherein, the valve core 41 and the valve rod 42 are screwed and screwed by screw threads and are firmly welded to form a component structure.

The valve core 41 is cylindrical, the valve core conical valve port 411 is located at the lower end of the valve core 41, the valve seat conical valve port 21 is located on the inner side wall of the upper end of the valve seat 2, and a valve port sealing pair is formed by the valve core conical valve port 411 and the valve seat conical valve port 21, so that the key of ensuring no internal leakage when the valve is closed is achieved.

The cylinder assembly 7 is used for driving the valve rod 42 to move up and down, so that the valve core 41 is driven to be in contact with or separated from the valve seat 2, and the valve body 1 is switched on and off.

The effect of the technical scheme of this embodiment is that, through the cooperation of the case awl valve mouth 411 and the valve seat awl valve mouth 21 that set up, can prevent the leakage in the valve, improved the leakproofness of valve. The valve core 41 is conveniently driven to contact with or separate from the valve seat 2 through the arranged air cylinder assembly 7, so that the valve body 1 is switched on and off, and the fluid is conveniently conveyed. The utility model discloses long service life does not need too much maintenance, has reduced the maintenance cost of enterprise, has improved production efficiency.

Preferably, in this embodiment, the lower end of the valve core 41 is a cone structure, and a transition cone surface with a downward tip is disposed between the cone port 411 of the valve core and the end of the lower end of the valve core 41. Therefore, in a small opening range, a flow channel with linear change is formed by the transition conical surface on the valve core 41 and the through hole on the valve seat 2, so that the impact when the valve is opened is favorably reduced, the positions of the valve core 41 and the valve seat 2 are favorably swept when the valve is opened in a small opening range, particle impurities are prevented from being remained at the positions of the valve core 41 and the valve seat 2, the risk that the particle impurities are extruded by the valve core 41 and the valve seat 2 when the valve is closed is reduced, and the risk of internal leakage is further reduced.

Preferably, in this embodiment, the top end of the valve body 1 is provided with a through hole for sliding out the other end of the valve rod 42, the valve body 1 is provided with a valve cover assembly 6 for closing the through hole, the other end of the valve rod 42 slides through the valve cover assembly 6, and the cylinder assembly 7 is connected with the valve cover assembly 6.

Wherein, can seal the opening through the valve gap subassembly 6 that sets up, improve the leakproofness, avoid appearing the leakage condition, make things convenient for cylinder assembly 7 to drive the reciprocating motion of valve rod 42 and case 41 simultaneously.

Wherein, valve gap subassembly 6 passes through the bolt to be connected with the top of valve body 1 to can dismantle the maintenance, it is very convenient. And the cylinder assembly 7 is connected with the valve cover assembly 6 in a threaded mode and can be detached as well.

Preferably, in the present embodiment, the bonnet assembly 6 includes a bonnet 61, a packing seal assembly 611 and a seal gland 64, the other end of the valve rod 42 sequentially slides through the bonnet 61 and the seal gland 64, the packing seal assembly 611 is located at a gap between the valve rod 42 and the bonnet 61, the seal gland 64 is detachably connected to the bonnet 61, the lower end of the seal gland 64 abuts against the packing seal assembly 611, and the packing seal assembly 611 is pressed and expanded through the seal gland 64.

The valve cover 61 is a disc structure with a cylindrical boss at the upper end, the outer cylindrical surface of the cylindrical boss is of a three-level stepped structure with a small upper part and a large lower part, the cylindrical surface of the middle-level step is divided into two parts, the lower part is a polished surface matched with the air cylinder assembly 7, and the upper part is an external thread end and is in threaded connection with the air cylinder assembly 7.

The other end of the valve rod 42 passes through the axis of the valve cover 61, which is beneficial to the assembly of the valve cover 61 and the valve body 1.

Wherein, the lower extreme of valve gap 61 is equipped with the round platform, and the opening tolerance fit of round platform side face of cylinder and valve body 11 upper end guarantees the installation axiality requirement. The large annular area outside the circular table of the valve cover 61 is provided with a circle of uniformly distributed mounting holes, the upper end surface of the valve body 1 is provided with screw holes, and the mounting holes correspond to the screw holes on the upper end surface of the valve body 1, so that the valve body 1 and the valve cover 61 can be fastened and connected through a stud to form a closed pressure-bearing body.

Wherein, be equipped with gland nut 65 on the gland 64, gland nut 65 and the top threaded connection of valve gap 61, through rotatory gland nut 65 with gland 64 down packing seal assembly 611. The gland nut 65 can adjust the sealing compression amount of the packing seal assembly 611, and after the seal is worn, the packing seal assembly can be further screwed and extruded to realize the sealing compensation capacity.

In addition, it should be noted that, the packing seal assembly 611 can be provided with a plurality of groups, which can effectively improve the sealing performance, prolong the service life of the seal, and reduce the risk of leakage.

Wherein, can set up spacer ring 62 between the sealed subassembly 611 of multiunit packing, can separate the sealed subassembly 611 of packing through spacer ring 62, realize many times sealed effect. Wherein, be equipped with sealed culvert body hole on the inside wall that valve gap 61 and valve rod 42 are connected, the spacer ring 62 is placed at sealed culvert body downtheholely, can fix spacer ring 62.

Preferably, in this embodiment, a guide disc 5 and a sleeve 3 are arranged between the valve cover 61 and the valve seat 2, the lower end of the sleeve 3 is connected with the valve seat 2, the sleeve 3 is provided with a plurality of flow passage windows 31, the upper end of the sleeve 3 is connected with the guide disc 5, the guide disc 5 is connected with the valve body 1, and the other end of the valve rod 42 slidably penetrates through the guide disc 5.

The other end of the valve rod 42 passes through the sleeve 3 and the guide disc 5, and passes through the sleeve 3 and the guide disc 5 in the axial direction, respectively.

The sleeve 3 is of a cylindrical structure, the plurality of flow passage windows 31 are located on the side wall of the sleeve 3 and are annularly and uniformly distributed around the axis of the sleeve 3, and the inner space and the outer space of the sleeve 3 are communicated through the plurality of flow passage windows 31. The bottom of the sleeve 3 is sleeved on the upper end of the valve seat 2 and is abutted against the valve seat 2, and the valve seat 2 is fixed in the valve body 1. The top end of the sleeve 3 is nested on the annular table surface of the guide disc 5 and is pressed and fixed in the valve body 1 under the action of the guide disc 5.

Wherein the guide disc 5 is pressed and fixed on the valve body 1 by the valve cover 61. The guide disc 5 is of a step-shaped disc structure, four steps are arranged on the lower end face of the guide disc, and the ring face of the second step of the guide disc 5 is in compression contact with the upper end face of the sleeve 3. The guide disc 55 is provided with a light hole at the center for the valve rod 42 to pass through, and the light hole is in guiding fit with the valve rod 42. A plurality of small holes are uniformly distributed on the periphery of the unthreaded hole of the guide disc 5 and are communicated with the upper space and the lower space of the guide disc 5.

Preferably, in the present embodiment, graphite gaskets are disposed at the joints of the guide disc 5, the valve body 1 and the valve cover 61.

The graphite gasket is positioned at the joint of the first-stage step ring surface and the upper end surface of the outermost edge of the guide disc 5 and the valve body 1 and the valve cover 61 respectively, so that the fluid in the valve body 1 is ensured not to leak.

Wherein, the lower terminal surface of round platform of valve gap 61 is close to the edge and is equipped with less step, and the step face extrudees the laminating with the up end of placing the graphite gasket at the up end of positioning disk 5 and forms sealed vice, improves the leakproofness.

Preferably, in the embodiment, the cylinder assembly 7 includes a bracket 71, a cylinder 74 and a position indicator 72, wherein the bottom end of the bracket 71 is connected with the valve body 1, the cylinder 74 is connected with the top end of the bracket 71, the position indicator 72 is connected with the output end of the cylinder 74, and the other end of the valve rod 42 is connected with the position indicator 72.

The bracket 71 is used for supporting the fixed cylinder 74. The bracket 71 is a steel casting in a shape like a Chinese character 'kou', the upper end of the bracket is in a flange structure, and the bracket is provided with a mounting hole connected with the bottom of the air cylinder 74 and fixedly connected with the air cylinder through a screw. The lower end of the bracket 71 is of a circular ring structure with a hole at the center, is sleeved on the valve cover 61, and is in threaded connection with the upper end of the valve cover 61 through a circular nut 63, so that the bracket 71 and the valve cover 61 are connected together. The upright columns on the two sides of the bracket 71 are of non-uniform cross-section structures, and the inner sides of the upright columns are provided with rib plates for mounting travel indication plates 73, electromagnetic valves and other electrical control elements. The movement position is displayed by a stroke indicator 73 and a position indicator 72.

Preferably, in this embodiment, the air cylinder 74 includes a piston rod 741, a cylinder head 743, a cylinder tube 744, a piston 746, and a cylinder tail 748, where the cylinder head 743 is connected to one end of the cylinder tube 744, the cylinder head 743 is connected to the top end of the bracket 71, the cylinder tail 748 is connected to the other end of the cylinder tube 744, the piston 746 is slidably connected in the cylinder tube 744, one end of the piston rod 741 is connected to the piston 746, the other end of the piston rod 741 slidably penetrates through the cylinder head 743, and a guide sleeve 742 is disposed at a connection between the piston rod 741 and the cylinder head 743.

Wherein, the cylinder head 743 and the cylinder tail 748 are respectively connected with two ends of the cylinder tube 744 in a sealing way. The cylinder 744 is divided into an upper space and a lower space by the piston 746, and the piston 746 reciprocates up and down in the cylinder 744 to drive the piston rod 741 to reciprocate up and down. One end of the piston rod 741 is connected to the piston 746 through a lock nut 747, and a washer 745 is disposed on the lock nut 747.

Wherein, piston 746 is discoid structure, and piston sealing circle 746-1 is installed to the excircle side, and piston 746 passes through piston sealing circle 746-1 and the sealed cooperation of cylinder 744 inner wall, guarantees that piston 746 can carry out fully sealed to two upper and lower spaces of cylinder 744.

The cylinder tail 748 and the cylinder head 743 are both disc-shaped structures, one end close to the cylinder barrel 744 is in a circular truncated cone shape, a sealing groove is arranged in the center of the outer side of the circular truncated cone shape, and an O-shaped ring is sleeved in the sealing groove and is in sealing contact with the inner wall of the cylinder barrel 744. The center of the cylinder head 743 is provided with a stepped through hole for mounting the guide sleeve 742, and is in sealing fit with an O-ring. The guide sleeve 742 fits over the piston rod 741 and is in sealing engagement therewith. The cylinder tail 748 and the cylinder head 743 are provided with a circle of evenly distributed screw mounting holes close to the outer edges, and the cylinder tail 748 and the cylinder head 743 are fastened and connected together through a stud, so that a complete component assembly is formed.

Preferably, in this embodiment, a head port 743-1 communicating with the cylinder tube 744 is provided at the head 743, and a tail port 748-1 communicating with the cylinder tube 744 is provided at the tail 748.

The cylinder head air port 743-1 and the cylinder tail air port 748-1 are respectively communicated with an external control air path, compressed air is introduced into the upper space or the lower space of the cylinder 744 through the cylinder head air port 743-1 and the cylinder tail air port 748-1 by switching the direction of action of an electromagnetic valve on the external air path, at the moment, the lower space or the upper space exhausts, and the piston 746 moves downwards or upwards to drive the valve core 41 to move upwards and downwards through the air pressure action, so that the on-off of the valve is realized, and the purpose of controlling the on-off of pipeline fluid is finally achieved.

Preferably, the guide sleeve 742 comprises a guide ring 742-1 and a dust ring 742-2, and the guide ring 742-1 and the dust ring 742-2 are sleeved on the piston rod 741. The sealing is improved by the guide ring 742-1, and dust is prevented from entering the cylinder 744 by the dust ring 742-2.

It should be noted that the position indicator 72 is composed of an upper nut and a lower nut, the centers of the two nuts are threaded through holes, and are respectively in threaded connection with the end portions of the piston rod 741 and the valve rod 42, the outer ring of the upper nut is provided with three uniformly distributed threaded through holes, the lower nut is provided with three corresponding through holes, the connection position of the piston rod 741 and the valve rod 42 is adjusted, and the upper nut and the lower nut are fastened and connected into a whole through three screws, so that the connection between the valve rod 42 and the piston rod 741 is realized. The outer side surfaces of the upper nut and the lower nut are symmetrical conical surfaces, after the upper nut and the lower nut are fastened and attached, the two conical surfaces form an arrow shape, and a valve position pointer is made according to the arrow and corresponds to a stroke indicator 73 marked with valve stroke scales, so that the valve position state is displayed.

The working principle of this embodiment is that when the pneumatic on-off valve is used, the cylinder tail gas port 748-1 and the cylinder head gas port 743-1 of the cylinder 74 are respectively communicated with an external gas circuit, and the external gas circuit is provided with elements such as a solenoid valve, a speed regulating valve, a one-way valve, a pneumatic triple piece and the like, and the reversing action of the solenoid valve is controlled according to a process control signal, so that air is admitted from one side of an upper space and a lower space in the cylinder 74, and exhausted from the other side, and the piston 746 is pushed to move upwards or downwards in the cylinder 744 by air pressure, so as to drive the valve core 41 to move upwards and downwards, thereby realizing the opening or closing of the valve and achieving the final control effect.

In the description of the present invention, it is to be understood that the terms "center", "length", "up", "down", "front", "back", "left", "right", "vertical", "horizontal", "top", "inner", "outer", "circumferential", and the like, indicate orientations or positional relationships based on those shown in the drawings, and are merely for convenience of description and simplicity of description, and do not indicate or imply that the device or element being referred to must have a particular orientation, be constructed and operated in a particular orientation, and thus, should not be construed as limiting the present invention.

In the description of the present invention, "a plurality" means at least two, e.g., two, three, etc., unless specifically limited otherwise.

In the present invention, unless otherwise expressly stated or limited, the terms "mounted," "connected," and "fixed" are to be construed broadly and may, for example, be fixedly connected, detachably connected, or integrally formed; can be mechanically or electrically connected; they may be directly connected or indirectly connected through intervening media, or they may be connected internally or in any other suitable relationship, unless expressly stated otherwise. The specific meaning of the above terms in the present invention can be understood according to specific situations by those skilled in the art.

In the description herein, references to the description of the term "one embodiment," "some embodiments," "an example," "a specific example," or "some examples," etc., mean that a particular feature, structure, material, or characteristic described in connection with the embodiment or example is included in at least one embodiment or example of the invention. In this specification, the schematic representations of the terms used above are not necessarily intended to refer to the same embodiment or example. Furthermore, the particular features, structures, materials, or characteristics described may be combined in any suitable manner in any one or more embodiments or examples. Furthermore, various embodiments or examples and features of different embodiments or examples described in this specification can be combined and combined by one skilled in the art without contradiction.

The above description is only for the preferred embodiment of the present invention, and is not intended to limit the present invention, and any modifications, equivalent replacements, improvements, etc. made within the spirit and principle of the present invention should be included within the protection scope of the present invention.

Claims (10)

1. A pneumatic on-off valve, comprising:

the water-saving valve comprises a valve body (1), wherein a valve seat (2) is arranged in the valve body (1), the valve seat (2) divides an inner cavity of the valve body (1) into a water inlet cavity (11) and a water outlet cavity (12), and a valve seat conical valve port (21) is arranged on the valve seat (2);

the valve core assembly (4) comprises a valve rod (42) and a valve core (41), one end of the valve rod (42) penetrates through the valve body (1) in a sliding mode, the valve core (41) is fixedly connected with the other end of the valve rod (42), a valve core conical valve port (411) matched with the valve seat conical valve port (21) is formed in the valve core (41), and the water inlet cavity (11) and the water outlet cavity (12) are disconnected or communicated through contact and separation of the valve seat conical valve port (21) and the valve core conical valve port (411);

the output end of the air cylinder component (7) is in transmission connection with one end of the valve rod (42), and the air cylinder component (7) is connected to the valve body (1).

2. The pneumatic on-off valve according to claim 1, wherein the lower end of the valve core (41) is of a cone structure, and a transition cone surface is arranged between the cone valve port (411) of the valve core and the end part of the lower end of the valve core (41).

3. The pneumatic on-off valve according to claim 1, characterized in that a through opening for sliding out of the other end of the valve rod (42) is arranged at the top end of the valve body (1), a valve cover assembly (6) for closing the through opening is arranged on the valve body (1), the other end of the valve rod (42) slides through the valve cover assembly (6), and the cylinder assembly (7) is connected with the valve cover assembly (6).

4. The pneumatic on-off valve according to claim 3, characterized in that the valve cover assembly (6) comprises a valve cover (61), a packing seal assembly (611) and a sealing gland (64), the other end of the valve rod (42) sequentially slides through the valve cover (61) and the sealing gland (64), the packing seal assembly (611) is located at a gap between the valve rod (42) and the valve cover (61), the sealing gland (64) is detachably connected with the valve cover (61), the lower end of the sealing gland (64) abuts against the packing seal assembly (611), and the packing seal assembly (611) is pressed and expanded through the sealing gland (64).

5. A pneumatic on-off valve according to claim 4, characterized in that a guide disc (5) and a sleeve (3) are arranged between the valve cover (61) and the valve seat (2), the lower end of the sleeve (3) is connected with the valve seat (2), a plurality of flow passage windows (31) are arranged on the sleeve (3), the upper end of the sleeve (3) is connected with the guide disc (5), the guide disc (5) is connected with the valve body (1), and the other end of the valve rod (42) slides through the guide disc (5).

6. Pneumatic on-off valve according to claim 5, characterized in that the joints of the guiding disc (5) with the valve body (1) and the valve cover (61) are provided with graphite gaskets.

7. The pneumatic on-off valve according to any one of claims 1 to 6, characterized in that the cylinder assembly (7) comprises a bracket (71), a cylinder (74) and a position indicator (72), wherein the bottom end of the bracket (71) is connected with the valve body (1), the cylinder (74) is connected with the top end of the bracket (71), the position indicator (72) is connected with the output end of the cylinder (74), and the other end of the valve rod (42) is connected with the position indicator (72).

8. The pneumatic on-off valve according to claim 7, wherein the cylinder (74) comprises a piston rod (741), a cylinder head (743), a cylinder barrel (744), a piston (746) and a cylinder tail (748), the cylinder head (743) is connected with one end of the cylinder barrel (744), the cylinder head (743) is connected with the top end of the bracket (71), the cylinder tail (748) is connected with the other end of the cylinder barrel (744), the piston (746) is slidably connected in the cylinder barrel (744), one end of the piston rod (741) is connected with the piston (746), the other end of the piston rod (741) slidably penetrates through the cylinder head (743), and a guide sleeve (742) is arranged at the joint of the piston rod (741) and the cylinder head (743).

9. The pneumatic on-off valve according to claim 8, wherein a head port (743-1) communicating with the cylinder tube (744) is provided in the head (743), and a tail port (748-1) communicating with the cylinder tube (744) is provided in the tail (748).

10. The pneumatic on-off valve according to claim 9, characterized in that the guide sleeve (742) comprises a guide ring (742-1) and a dust ring (742-2), the guide ring (742-1) and the dust ring (742-2) being fitted over the piston rod (741).

Images