CN112483670B

CN112483670B - Explosion-proof valve core and water valve

Info

Publication number: CN112483670B
Application number: CN202011373618.4A
Authority: CN
Inventors: 洪荣东; 洪扁东; 洪文强
Original assignee: Quanzhou Liweisi Precision Hardware Co ltd
Current assignee: Quanzhou Liweisi Precision Hardware Co ltd
Priority date: 2020-11-30
Filing date: 2020-11-30
Publication date: 2022-11-11
Anticipated expiration: 2040-11-30
Also published as: CN112483670A

Abstract

The invention discloses an explosion-proof valve core and a water valve, which comprise a pressing cover, an inner shell, a valve rod, a movable sheet and a static sheet; the static sheet and the moving sheet are arranged in the inner cavity of the inner shell, and a water outlet is formed in the side wall of the inner shell; the valve rod is connected with the movable plate to drive the movable plate to rotate; a threaded section for connecting the outer shell of the water valve is arranged at the lower end of the compression cover, and a first limiting step for abutting against the lower end of the threaded section is formed on the inner shell; and a second limiting step which is propped against the valve rod from top to bottom is formed on the inner shell. Compared with the prior art, the invention can reduce the risks of part flying out and a large amount of water flow flowing out caused by the fracture of the break point on the pressing cover, so that the secondary loss is not easy to cause after the water valve is damaged, and the subsequent water valve replacement operation is convenient.

Description

Explosion-proof valve core and water valve

Technical Field

The invention relates to the field of water valve accessories, in particular to an explosion-proof valve core and a water valve.

Background

A weak part exists above a thread section of a pressing cover of an existing water valve, and the weak part is called a breakpoint in the industry. After the existing valve core is broken at the breakpoint position, a switch component in the valve core is easy to fly out under the action of water pressure, so that water flows out in a large quantity, large accumulated water is easy to exist in a use environment, and subsequent maintenance and replacement are inconvenient.

The existing valve core has the following defects besides the defects:

1. the switch positioning structure of the existing valve core is built-in, and is easy to cause positioning failure due to long-time soaking, oxidation and corrosion.

2. When current case installation handle, because the number of teeth of the internal tooth on the handle is 20 teeth in the trade, for the convenience adaptation handle, its number of teeth is inconvenient to be changed, can only be separated by 18 degrees when leading to the handle fine setting to when the assembly, the handle is difficult to adjust well to the assigned position. The existing method is to lock the pressing cover a little or loose the pressing cover a little, but the service life and the performance of the valve core are affected.

In view of the above, the applicant has made an intensive study on the above defects in the prior art, and has developed the present invention.

Disclosure of Invention

The invention mainly aims to provide an explosion-proof valve core which has the characteristic of preventing an internal switch component from flying out after a breakpoint bursts, reduces the water leakage flow and is convenient to maintain.

In order to achieve the above purpose, the solution of the invention is:

an explosion-proof valve core comprises a pressing cover, an inner shell, a valve rod, a movable plate and a fixed plate; the static sheet and the moving sheet are arranged in the inner cavity of the inner shell, and a water outlet is formed in the side wall of the inner shell; the valve rod is connected with the moving plate so as to drive the moving plate to rotate; a threaded section for connecting the water valve shell is arranged at the lower end of the compression cover, and a first limiting step for abutting against the lower end of the threaded section is formed on the inner shell; and a second limiting step which is propped against the valve rod from top to bottom is formed on the inner shell.

Furthermore, the upper end of the inner shell extends into the compression cover, a first sealing groove is formed in the outer wall of the upper portion of the inner shell, and a first sealing ring which is in abutting and sealing with the inner wall of the thread section is arranged in the first sealing groove.

Furthermore, a limit groove is formed on the thread section of the pressing cover, and a limit bump is formed on a first limit step of the inner shell; the limiting bump is embedded in the limiting notch to limit the relative rotation of the pressing cover and the inner shell.

Furthermore, a limiting convex strip is formed on the inner wall of the compression cover, and a limiting groove is formed on the limiting convex strip; the upper part of the inner shell is provided with a limiting lug embedded into the limiting groove, and the limiting lug and the limiting groove are mutually matched to limit the relative rotation of the pressing cover and the inner shell.

Furthermore, the limiting groove is a punching groove formed by punching the limiting convex strip, two limiting grooves are formed in the limiting convex strip, and two limiting convex blocks corresponding to the limiting grooves are arranged on the upper portion of the inner shell.

Further, be formed with the spacing step of fourth on the interior casing of moving plate below, the spacing step below of fourth is provided with the stereoplasm locating part, the upper end and the lower extreme of stereoplasm locating part all are provided with the sealing washer, the contact is supported with the spacing step of fourth to the stereoplasm locating part from bottom to top.

Furthermore, a limiting through hole is formed in the pressing cover; the limiting device comprises a limiting through hole, a limiting block is formed on the valve rod and is rotationally arranged in the limiting through hole around the axis of the valve rod, and two first abutting surfaces used for limiting the rotating range of the limiting block are formed in the limiting through hole.

Furthermore, the limiting block is provided with second abutting surfaces which are parallel to each other and used for abutting against the first abutting surfaces, and the limiting block is also provided with a second arc-shaped surface for connecting the two second abutting surfaces; the two first abutting surfaces are arranged perpendicular to each other.

Further, the valve rod comprises an upper valve rod and a lower valve rod, and the upper valve rod and the lower valve rod are detachably connected; the lower valve rod is connected with the upper part of the inner wall of the inner shell in a sealing mode, the lower valve rod is connected with the moving plate, and the limiting block is formed on the upper valve rod.

Furthermore, the lower end of the upper valve rod is provided with a transmission column, the upper end of the lower valve rod is provided with a transmission groove, and the transmission column is inserted in the transmission groove.

Furthermore, the lower end of the upper valve rod is provided with a transmission groove, the upper end of the lower valve rod is provided with a transmission column, and the transmission column is inserted in the transmission groove.

Further, a second sealing groove is formed in the side portion of the lower valve rod, a second sealing ring is arranged in the second sealing groove, and the second sealing ring is connected with the inside of the inner shell in a propping and sealing mode.

Furthermore, a third limiting step is formed inwards on the upper portion of the inner shell, and a first sealing element in sealing connection with the lower valve rod is arranged on the lower surface of the third limiting step.

Further, a sealing boss is arranged on the lower side part of the upper valve rod, and a second sealing element and a third sealing element are respectively arranged on the upper surface and the lower surface of the sealing boss; the upper end of the inner shell is provided with a third sealing groove, a third sealing ring is arranged in the third sealing groove, and the third sealing ring is connected with the third sealing piece in a propping and sealing mode.

Furthermore, the upper end of the valve rod is connected with an adapter, and the adapter is provided with a first mounting hole which is vertically communicated; a second mounting hole which is coaxial with the first mounting hole is formed at the upper end of the valve rod; a first tooth part is formed on the valve rod, a second tooth part connected with the first tooth part is formed on the adapter, and a third tooth part matched with the handle is formed on the outer wall of the upper end of the adapter; the number of teeth of the first tooth portion and the second tooth portion is larger than that of the third tooth portion.

Further, the first tooth part is an internal tooth formed in the second mounting hole, and the second tooth part is an external tooth formed on the outer wall of the lower end of the adapter. Preferably, the material hardness of the adaptor is greater than that of the valve rod in contact with the adaptor, and when the adaptor is locked, the lower end of the third tooth part is embedded into the upper end face of the valve rod.

Furthermore, an anti-slip groove is formed in the middle of the third tooth portion, and an anti-slip piece is arranged in the anti-slip groove.

Furthermore, the antiskid groove is annularly arranged in the middle of the third tooth part of the adapter, and the antiskid piece is an antiskid ring sleeved on the antiskid groove.

Further, the first tooth part is an external tooth formed on the outer wall of the upper end of the valve rod, and the second tooth part is an internal tooth formed on the lower portion of the inner wall of the first mounting hole of the adapter.

Further, the first tooth part and the second tooth part are provided with taper angles which are small and big at the bottom along the axis direction of the valve rod.

Furthermore, locking parts for locking the adaptor and the valve rod mutually are arranged in the first mounting hole and the second mounting hole.

Further, the number of teeth of the third tooth portion is 20; the number of teeth of the first tooth part and the second tooth part is equal to and larger than that of the third tooth part.

Further, the number of teeth of the first tooth portion and the second tooth portion is 30, 32, 34 or 36.

A water valve comprises a valve body and the explosion-proof valve core arranged on the valve body.

After adopting the structure, the invention relates to an explosion-proof valve core and a water valve, which at least have the following beneficial effects:

1. the first limiting step is abutted against the lower end of the threaded section, and the second limiting step on the inner shell tightly abuts against the valve rod from top to bottom. In case the breakpoint on compressing tightly the lid breaks, compress tightly the screw thread section on the lid still threaded connection on the valve body to can not make interior casing departure through supporting tight first spacing step, interior casing will support tightly with the valve rod that the rotor is connected through the spacing step of second, thereby avoided rotor and stator separation, and then avoided rivers to flow in a large number.

2. The limiting through holes are formed in the pressing cover, so that the switch positioning structure of the valve rod is transferred to the outside of the valve core from the inside of the valve core, the switch positioning structure is prevented from being damaged by long-term water soaking, and the service life of a product is prolonged.

3. Through the arrangement of the adapter, the handle is connected with the upper end of the adapter, and the lower end of the adapter is connected with the part, exposed out of the pressing cover, of the valve rod. Because the number of teeth of the first tooth part and the second tooth part is greater than that of the third tooth part, the flexibility of angle adjustment during handle installation is improved. So that the pressing cover can be locked on the valve body according to the specified moment during assembly.

4. Through setting up the antiskid groove for the handle with the back is connected to third tooth portion, antiskid on the antiskid groove piece and handle extrusion friction for need adjustment handle angle and can with when pulling down the handle the adaptor is together pulled down, and then conveniently adjusts the relative position of first tooth portion and second tooth portion.

5. The first tooth part and the second tooth part are both provided with tapers, so that the adapter piece can tightly attach the second tooth part to the first tooth part of the valve rod without a gap along with the locking of the locking piece.

Compared with the prior art, the invention can reduce the risks of part flying out and a large amount of water flow flowing out caused by the fracture of the break point on the pressing cover, so that the secondary loss is not easy to cause after the water valve is damaged, and the subsequent water valve replacement operation is convenient.

Drawings

Fig. 1 is a schematic sectional structure diagram of an explosion-proof valve core according to the invention.

Fig. 2 is an external structural schematic diagram of an explosion-proof valve core related to the invention.

Fig. 3 is an exploded view of an explosion-proof valve core according to the present invention.

Fig. 4 is an exploded view of the cross-sectional structure of the pressing cover and the inner housing.

Fig. 5 is a schematic perspective exploded view of the adaptor and the valve core.

Fig. 6 is a schematic perspective exploded view of the adaptor and the valve stem.

Fig. 7 is a schematic perspective exploded view of the adaptor and the valve stem at another angle.

Fig. 8 is a partial sectional view of the adapter in use.

Fig. 9 is a sectional perspective view of the hold-down cap.

Fig. 10 is a schematic structural view of an explosion-proof valve core in another embodiment.

Fig. 11 is an exploded view of another embodiment of a compression cap and valve stem assembly.

FIG. 12 is a schematic cross-sectional view of another embodiment of a compression cap and valve stem assembly.

FIG. 13 is an exploded cross-sectional view of another embodiment of a compression cap and valve stem assembly.

In the figure:

a pressing cover 1, a thread section 11, a limit convex strip 12,

A limit through hole 13, a limit groove 121, a first abutting surface 131,

An inner shell 2, a water outlet 21, a first limit step 22, a second limit step 23,

A first sealing groove 24, a first sealing ring 25, a limit lug 26, a fourth limit step 27,

A third limit step 28, a third seal groove 29, a hard limit member 271,

A first sealing element 281, a third sealing ring 291, a moving plate 3, a fixed plate 4,

A valve rod 5, a limit block 51, an upper valve rod 52, a lower valve rod 53,

An adaptor 54, a second abutting surface 511, a transmission groove 521,

A sealing boss 522, a second sealing member 523, a third sealing member 524,

A first tooth portion 525, a second mounting hole 526, a transmission column 531,

A second seal groove 532, a second seal ring 533, a first mounting hole 541, a second seal ring, a third seal ring, a fourth seal ring, and a fourth seal ring,

Second tooth 542, third tooth 543, anti-slip groove 544, anti-slip member 545.

Detailed Description

In order to further explain the technical solution of the present invention, the present invention is explained in detail by the following specific examples.

As shown in fig. 1 to fig. 3, the explosion-proof valve core related to the present invention includes a pressing cover 1, an inner housing 2, a moving plate 3 of a valve rod 5, a stationary plate 4, and a valve rod 5; the static sheet 4 and the moving sheet 3 are arranged in the inner cavity of the inner shell 2, and a water outlet 21 is formed on the side wall of the inner shell 2; the valve rod 5 is connected with the moving plate 3 to drive the moving plate 3 to rotate; the lower end of the pressing cover 1 is provided with a threaded section 11 for connecting a water valve shell, and a first limiting step 22 for abutting against the lower end of the threaded section 11 is formed on the inner shell 2; a second limit step 23 which is propped against the valve rod 5 from top to bottom is also formed on the inner shell 2.

Therefore, according to the explosion-proof valve core and the water valve provided by the invention, the first limiting step 22 is abutted against the lower end of the threaded section 11, and the second limiting step 23 on the inner shell 2 tightly abuts against the valve rod 5 from top to bottom. In case compress tightly the breakpoint fracture on the lid 1, compress tightly the screw thread section 11 on the lid 1 still threaded connection on the valve body to can not make interior casing 2 departure through supporting tight first spacing step 22, interior casing 2 supports tightly through the valve rod 5 that second spacing step 23 will be connected with rotor 3, thereby has avoided rotor 3 and stator 4 to separate, and then has avoided rivers to flow in a large number.

Preferably, the upper end of the inner casing 2 extends into the compressing cover 1, a first sealing groove 24 is formed on the outer wall of the upper part of the inner casing 2, and a first sealing ring 25 which is sealed by abutting against the inner wall of the threaded section 11 is arranged in the first sealing groove 24. The first sealing ring 25 is fixed and limited in the first sealing groove 24, and the first sealing ring 25 seals a gap between the inner shell 2 and the inner wall of the compression cover 1.

Preferably, in the first embodiment, as shown in fig. 11 and 13, a limiting groove 121 is formed on the threaded section 11 of the pressing cap 1, and a limiting projection 26 is formed on the first limiting step 22 of the inner housing 2; the limiting protrusion 26 is embedded in the limiting groove 121 to limit the relative rotation between the compressing cover 1 and the inner housing 2.

In the second embodiment, as shown in fig. 4 and 9, a limiting convex strip 12 is formed on the inner wall of the pressing cover 1, and a limiting groove 121 is formed on the limiting convex strip 12; the upper part of the inner housing 2 is provided with a limiting projection 26 embedded in the limiting groove 121, and the limiting projection 26 and the limiting groove 121 are matched with each other to limit the relative rotation of the compressing cover 1 and the inner housing 2. Like this, compress tightly lid 1 fixed mounting back on the valve body, because interior casing 2 with compress tightly between the lid 1 through spacing groove 121 with spacing lug 26 is spacing, has restricted interior casing 2's rotation has so guaranteed the drive of valve rod 5 when moving plate 3 rotates, interior casing 2 can remain stable, can not increase along with the live time and become flexible.

Preferably, the limiting groove 121 is a punched groove punched by the limiting protruding strip 12, two limiting grooves 121 are disposed on the limiting protruding strip 12, and two limiting protrusions 26 corresponding to the limiting grooves 121 are disposed on the upper portion of the inner housing 2. The limiting groove 121 is formed by blanking, so that the limiting groove 121 is greatly convenient to process, and the production efficiency is improved. Through setting up two spacing grooves 121 for interior casing 2 with compress tightly the spacing more firm stability between the lid 1.

Preferably, a fourth limiting step 27 is formed on the inner shell 2 below the moving plate 3, a hard limiting part 271 is arranged below the fourth limiting step, sealing rings are arranged at the upper end and the lower end of the hard limiting part 271, and the hard limiting part 271 abuts against and contacts with the fourth limiting step 27 from bottom to top. Through two sealing rings about stereoplasm locating part 271 for the bottom of case can guarantee the result of use with the water inlet sealing connection of valve body.

Preferably, as shown in fig. 11, a limiting through hole 13 is formed on the compression cover 1; the limiting block 51 is formed on the valve rod 5, the limiting block 51 is rotatably arranged in the limiting through hole 13 around the axis of the valve rod 5, and two first abutting surfaces 131 for limiting the rotating range of the limiting block 51 are formed in the limiting through hole 13. Through set up spacing through-hole 13 on compressing tightly lid 1 for the switch location structure of valve rod 5 shifts to the case outside from the case is inside, has avoided the long-term bubble water damage of switch location structure, has prolonged the life of product.

Preferably, the limiting block 51 has second abutting surfaces 511 which are parallel to each other and used for abutting against the first abutting surfaces 131, and the limiting block 51 further has a second arc-shaped surface connecting the two second abutting surfaces 511; the two first abutting surfaces 131 are arranged perpendicular to each other. When the valve rod 5 is used, the two second abutting surfaces 511 abut against the first abutting surfaces 131 in the limiting through holes 13 at two limit positions respectively, so that the range of the rotation angle of the valve rod 5 is limited. The distance between the first abutting surface 131 and the rotation axis of the valve rod 5 is equal to half of the distance between the two parallel second abutting surfaces 511, so that the rotation range of the limiting block 51 is limited to 0-90 degrees.

Preferably, as shown in fig. 6 and 7, the valve rod 5 comprises an upper valve rod 52 and a lower valve rod 53, and the upper valve rod 52 and the lower valve rod 53 are detachably connected; the lower valve rod 53 is connected with the upper part of the inner wall of the inner shell 2 in a sealing way, the lower valve rod 53 is connected with the moving plate 3, and the limiting block 51 is formed on the upper valve rod 52. The upper valve rod 52 is mounted on the pressing cover 1 by arranging the upper valve rod 52 and the lower valve rod 53 which can be hooked and detached, and the upper valve rod 52 is connected with the lower valve rod 53 after the lower valve rod 53 is mounted from bottom to top below the inner shell 2.

Preferably, in the first embodiment, as shown in fig. 11, a transmission column 531 is disposed at a lower end of the upper valve rod 52, a transmission groove 521 is formed at an upper end of the lower valve rod 53, and the transmission column 531 is inserted into the transmission groove 521.

In addition, in the second embodiment, a transmission groove 521 is formed at the lower end of the upper valve rod 52, a transmission column 531 is formed at the upper end of the lower valve rod 53, and the transmission column 531 is inserted into the transmission groove 521. Therefore, the upper valve rod 52 and the lower valve rod 53 are connected with the transmission column 531 through the transmission groove 521, the rotation of the upper valve rod 52 can be transmitted to the lower valve rod 53, and the installation is convenient.

Preferably, a second sealing groove 532 is formed at the side of the lower valve rod 53, a second sealing ring 533 is arranged in the second sealing groove 532, and the second sealing ring 533 is connected with the inside of the inner housing 2 in an abutting and sealing manner. The second sealing ring 533 is fixedly installed through the second sealing groove 532, and the second sealing ring 533 blocks a gap between the lower valve rod 53 and the inner wall of the inner housing 2, so that the use effect is ensured. Further, a third limit step 28 is formed inward at the upper portion of the inner housing 2, and a first sealing member 281 is disposed at a lower surface of the third limit step 28 and is sealingly coupled to the lower valve stem 53. The first sealing member 281 further functions to seal a gap between the lower valve rod 53 and the inner housing 2, thereby improving sealing performance of the product.

Preferably, the lower side of the upper valve rod 52 is provided with a sealing boss 522, and the upper surface and the lower surface of the sealing boss 522 are respectively provided with a second sealing member 523 and a third sealing member 524; the upper end of the inner shell 2 is provided with a third sealing groove 29, a third sealing ring 291 is arranged in the third sealing groove 29, and the third sealing ring 291 is connected with the third sealing element 524 in a propping and sealing manner. The second seal 523, the third seal 524, and the third seal 291 function as a secondary seal. Further improving the sealing performance of the product.

Preferably, an adaptor 54 is connected to the upper end of the valve rod 5, and the adaptor 54 has a first mounting hole 541 which penetrates up and down; a second mounting hole 526 coaxially arranged with the first mounting hole 541 is formed at the upper end of the valve rod 5; a first tooth portion 525 is formed on the valve rod 5, a second tooth portion 542 connected with the first tooth portion 525 is formed on the adaptor 54, and a third tooth portion 543 matched with a handle is formed on the outer wall of the upper end of the adaptor 54; the number of teeth of the first tooth portion 525 and the second tooth portion 542 is larger than that of the third tooth portion 543.

By providing the adaptor 54, the handle is connected to the upper end of the adaptor 54, and the lower end of the adaptor 54 is connected to the portion of the stem 5 exposed to the compression cap 1. Because the number of teeth of the first tooth portion 525 and the second tooth portion 542 is greater than that of the third tooth portion 543, the flexibility of angle adjustment during handle installation is improved. So that the pressing cover 1 can be locked on the valve body according to the specified moment during assembly.

Preferably, in the first embodiment, the first tooth portion 525 is an internal tooth formed in the second mounting hole 526, the second tooth portion 542 is an external tooth formed on an outer wall of a lower end of the adaptor 54, a non-slip groove 544 is formed in a middle portion of the third tooth portion 543, a non-slip member 545 is arranged in the non-slip groove 544, the non-slip groove 544 is annularly arranged in the middle portion of the third tooth portion 543 of the adaptor 54, and the non-slip member 545 is a non-slip ring sleeved on the non-slip groove 545. By arranging the anti-sliding groove 544, after the handle is connected with the third tooth portion 543, the anti-sliding piece 545 on the anti-sliding groove 544 is in extrusion friction with the handle, so that the adaptor can be detached together when the handle angle needs to be adjusted and the handle is detached, and the relative position of the first tooth portion 525 and the second tooth portion 542 can be adjusted conveniently.

In the second embodiment, the first tooth portion 525 is an external tooth formed on an outer wall of an upper end of the valve stem 5, and the second tooth portion 542 is an internal tooth formed on a lower portion of an inner wall of the first mounting hole 541 of the adaptor 54. Preferably, the first tooth portion 525 and the second tooth portion 542 have a taper which is small and big down in the axial direction of the valve rod 5; locking members for locking the adaptor 54 and the valve rod 5 to each other are disposed in the first mounting hole 541 and the second mounting hole 526. The first tooth portion 525 and the second tooth portion 542 are provided with tapers, so that the adaptor 54 can tightly attach the second tooth portion 542 to the first tooth portion 525 of the valve rod 5 without a gap following locking of the locking member.

Preferably, the number of teeth of the third tooth portion 543 is 20; the number of teeth of the first tooth portion 525 and the second tooth portion 542 is equal to and greater than that of the third tooth portion 543; the first tooth portion 525 and the second tooth portion 542 have 30, 32, 34, 36 teeth. The number of teeth of third tooth portion 543 matches with the number of teeth of the internal teeth of the existing handle, and can be used with most handles on the market. The number of teeth of the first tooth portion 525 and the second tooth portion 542 is set to 30, 32, 34 or 36, so that the strength of the tooth portions is ensured, and the slipping failure caused by excessive teeth is avoided.

The invention also provides a water valve which comprises a valve body and the explosion-proof valve core arranged on the valve body.

Compared with the prior art, the invention can reduce the risks of part flying and mass water flow caused by the broken breakpoint on the pressing cover 1, so that secondary loss is not easily caused after the water valve is damaged, and the subsequent water valve replacement operation is convenient.

The above embodiments and drawings are not intended to limit the form and style of the present invention, and any suitable changes or modifications thereof by those skilled in the art should be considered as not departing from the scope of the present invention.

Claims

1. An explosion-proof valve core is characterized by comprising a pressing cover, an inner shell, a valve rod, a movable plate and a fixed plate; the static sheet and the moving sheet are arranged in the inner cavity of the inner shell, and a water outlet is formed in the side wall of the inner shell; the valve rod is connected with the moving plate so as to drive the moving plate to rotate; a threaded section for connecting the water valve shell is arranged at the lower end of the compression cover, and a first limiting step for abutting against the lower end of the threaded section is formed on the inner shell; a second limiting step which is propped against the valve rod from top to bottom is formed on the inner shell;

a limiting through hole is formed in the pressing cover; a limiting block is formed on the valve rod, the limiting block is rotatably arranged in the limiting through hole around the axis of the valve rod, and two first abutting surfaces for limiting the rotating range of the limiting block are formed in the limiting through hole;

the limiting block is provided with second abutting surfaces which are parallel to each other and used for abutting against the first abutting surfaces, and the limiting block is also provided with a second arc-shaped surface for connecting the two second abutting surfaces; the two first butting surfaces are arranged vertically;

the valve rod comprises an upper valve rod and a lower valve rod, and the upper valve rod and the lower valve rod are detachably connected; the lower valve rod is connected with the upper part of the inner wall of the inner shell in a sealing mode, the lower valve rod is connected with the moving plate, and the limiting block is formed on the upper valve rod.

2. The explosion-proof valve core as claimed in claim 1, wherein the upper end of the inner housing extends into the compression cap, a first sealing groove is formed on the outer wall of the upper portion of the inner housing, and a first sealing ring which abuts against the inner wall of the threaded section for sealing is arranged in the first sealing groove.

3. The explosion-proof valve core according to claim 1, wherein a limit groove is formed on the threaded section of the pressing cover, and a limit projection is formed on the first limit step of the inner housing; the limiting lug is embedded in the limiting groove to limit the relative rotation of the pressing cover and the inner shell.

4. The explosion-proof valve core according to claim 1, wherein a limiting convex strip is formed on the inner wall of the pressing cover, and a limiting groove is formed on the limiting convex strip; the upper part of the inner shell is provided with a limiting lug embedded into the limiting groove, and the limiting lug and the limiting groove are mutually matched to limit the relative rotation of the pressing cover and the inner shell.

5. The explosion-proof valve core as claimed in claim 4, wherein said limiting groove is a punched groove punched by said limiting protrusion, said limiting protrusion is provided with two limiting grooves, and said upper portion of said inner housing is provided with two limiting protrusions corresponding to said limiting grooves, respectively.

6. The explosion-proof valve core according to claim 1, wherein a fourth limit step is formed on the inner housing below the moving plate, a hard limiting member is arranged below the fourth limit step, sealing rings are arranged at the upper end and the lower end of the hard limiting member, and the hard limiting member is in abutting contact with the fourth limit step from bottom to top.

7. The explosion-proof valve core as claimed in claim 1, wherein a transmission post is disposed at the lower end of the upper valve rod, a transmission groove is formed at the upper end of the lower valve rod, and the transmission post is inserted into the transmission groove.

8. The explosion-proof valve core as claimed in claim 1, wherein the lower end of the upper valve rod is provided with a transmission groove, the upper end of the lower valve rod is formed with a transmission post, and the transmission post is inserted into the transmission groove.

9. The explosion-proof valve core as claimed in claim 1, wherein a second sealing groove is formed at the side of the lower valve rod, a second sealing ring is arranged in the second sealing groove, and the second sealing ring is connected with the inside of the inner shell in a propping and sealing manner.

10. The explosion-proof valve core as recited in claim 1, wherein a third limit step is formed inward at the upper part of the inner housing, and a first sealing member sealingly connected with the lower valve rod is provided at the lower surface of the third limit step.

11. The explosion-proof valve core as recited in claim 1, wherein the lower side of the upper valve stem is provided with a sealing boss, and the upper surface and the lower surface of the sealing boss are respectively provided with a second sealing element and a third sealing element; the upper end of the inner shell is provided with a third sealing groove, a third sealing ring is arranged in the third sealing groove, and the third sealing ring is connected with the third sealing piece in a propping and sealing mode.

12. The explosion-proof valve core as claimed in claim 1, wherein an adaptor is connected to the upper end of the valve rod, and the adaptor has a first mounting hole which is through up and down; a second mounting hole which is coaxial with the first mounting hole is formed at the upper end of the valve rod; a first tooth part is formed on the valve rod, a second tooth part connected with the first tooth part is formed on the adapter, and a third tooth part matched with the handle is formed on the outer wall of the upper end of the adapter; the number of teeth of the first tooth portion and the second tooth portion is larger than that of the third tooth portion.

13. The vent valve cartridge according to claim 12, wherein the first tooth portion is an internal tooth formed in the second mounting hole, and the second tooth portion is an external tooth formed on an outer wall of a lower end of the adaptor.

14. The explosion proof valve cartridge of claim 12, wherein the third tooth portion has a slip-preventing groove formed in the middle thereof, and a slip-preventing member is disposed in the slip-preventing groove.

15. The explosion-proof valve core according to claim 14, wherein the anti-slip groove is annularly arranged in the middle of the third tooth portion of the adaptor, and the anti-slip member is an anti-slip ring sleeved on the anti-slip groove.

16. The explosion proof valve cartridge as defined in claim 12, wherein said first teeth portion is external teeth formed on an outer wall of an upper end of said valve stem, and said second teeth portion is internal teeth formed on a lower portion of an inner wall of said first mounting hole of said adaptor.

17. An explosion proof valve core as set forth in claim 16 wherein said first and second teeth each have a taper which is smaller and larger in the axial direction of the valve stem.

18. The explosion proof valve cartridge of claim 12 wherein said first and second mounting openings have locking members disposed therein for locking the adaptor to said valve stem.

19. The explosion-proof valve cartridge as defined in claim 12, wherein the number of teeth of said third tooth portion is 20; the number of teeth of the first tooth part and the second tooth part is equal to and larger than that of the third tooth part.

20. An explosion proof valve spool as claimed in claim 12 wherein the first and second teeth are each 30 or 32 or 34 or 36 in number.

21. A water valve comprising a water valve housing and an explosion-proof cartridge as claimed in any one of claims 1 to 20 mounted on the water valve housing.