CN214466465U

CN214466465U - Novel carbon tank solenoid valve

Info

Publication number: CN214466465U
Application number: CN202021663640.8U
Authority: CN
Inventors: 张平
Original assignee: Individual
Current assignee: Individual
Priority date: 2019-10-31
Filing date: 2020-08-12
Publication date: 2021-10-22
Anticipated expiration: 2030-08-12

Abstract

A novel carbon tank electromagnetic valve comprises a shell, wherein the shell is provided with an inner cavity, an air inlet pipe and an air outlet pipe, the air inlet pipe is communicated with the inner cavity, the rear end of the air outlet pipe is an air outlet, and the front end of the air inlet pipe is an air inlet; an electromagnetic valve device is arranged in the inner cavity and comprises a coil frame, a coil is wound on the coil frame, a movable valve core close to the air outlet and a static valve core close to the air inlet are arranged in the coil frame, a sealing part facing the air outlet is arranged on the movable valve core, and an elastic part for resetting the movable valve core is arranged between the movable valve core and the static valve core; when the coil of the electromagnetic valve device is not electrified, the movable valve core is ejected forwards under the action of the elastic piece, so that the sealing piece seals the air outlet; after the coil of the electromagnetic valve device is electrified, the movable valve core overcomes the elasticity of the elastic part to retreat under the action of electromagnetic force, so that the sealing part does not seal the air outlet any more. The utility model discloses a structure is more succinct relatively, is difficult for appearing the phenomenon of inefficacy.

Description

Novel carbon tank solenoid valve

Technical Field

The utility model relates to a carbon tank solenoid valve.

Background

Gasoline is a volatile liquid whose volatility increases with increasing temperature. At present, gas volatilized from gasoline in an automobile oil tank is directly discharged into the atmosphere to pollute the environment, and certain potential safety hazards also exist. Therefore, the problems of how to avoid the pollution of the volatilized gasoline to the environment and how to collect and utilize the volatilized gasoline have become the hot spots of the research in the industry.

Currently, it is common in the automotive field to use a canister solenoid valve to treat the gasoline vapors of an automobile. The existing automobile carbon tank electromagnetic valve is installed in an automobile evaporation gas recycling control system of an automobile, gasoline in an oil tank is easy to evaporate, the evaporation amount is increased along with the rise of temperature, in order to ensure that gasoline steam is not discharged into the atmosphere to pollute the environment, people use the good adsorption capacity of activated carbon to manufacture a carbon tank for temporarily storing the gasoline steam, when an engine works, an electronic control unit of the automobile sends out different electric pulse signals according to the working condition of the engine to control the opening or closing of the carbon tank electromagnetic valve, so that the gasoline steam in the carbon tank is sent into an engine cylinder through the carbon tank electromagnetic valve to be burnt, the environment is protected, and fuel is saved.

The existing carbon tank electromagnetic valve also has the following defects: the structure is too complex and is easy to fail.

Disclosure of Invention

In order to overcome the above-mentioned not enough of current carbon tank solenoid valve, the utility model provides a novel carbon tank solenoid valve that the structure is succinct.

The technical proposal of the utility model for solving the technical problem is that: a novel carbon tank electromagnetic valve comprises a shell, wherein the shell is provided with an inner cavity, an air inlet pipe and an air outlet pipe, the air inlet pipe is communicated with the inner cavity, the intersection of the air outlet pipe and the inner cavity is an air outlet, and the intersection of the air inlet pipe and the inner cavity is an air inlet;

the inner cavity is internally provided with an electromagnetic valve device, the electromagnetic valve device comprises a coil frame, a coil is wound on the coil frame, a movable valve core close to an air outlet and a static valve core close to an air inlet are arranged in the coil frame, a sealing part facing the air outlet is arranged on the movable valve core, an elastic part for resetting the movable valve core is arranged between the movable valve core and the static valve core, the elastic part acts on the movable valve core so that the movable valve core has a tendency of being close to the air outlet pipe, and the movable valve core can move so that the movable valve core is close to or far away from the air outlet pipe;

when the coil of the electromagnetic valve device is not electrified, the movable valve core is ejected forwards under the action of the elastic piece, so that the sealing piece seals the air outlet;

after the coil of the electromagnetic valve device is electrified, the movable valve core overcomes the elasticity of the elastic part to retreat under the action of electromagnetic force, so that the sealing element does not seal the air outlet any more.

Furthermore, the sealing element is arranged on the upper end surface of the movable valve core.

Furthermore, a concave caulking groove is formed in the upper end face of the movable valve core, and the sealing element is embedded into the caulking groove.

Furthermore, the inner wall of the caulking groove is also provided with a convex part or an inner concave part, the sealing element is rubber, and the rubber is vulcanized in the caulking groove.

Furthermore, the sealing element is flush with the upper end surface of the movable valve core or protrudes out of the embedded groove.

Furthermore, the movable valve core is provided with an upper convex shoulder, the static valve core is provided with a lower convex shoulder, the upper end of the elastic part is propped against the upper convex shoulder, and the lower end of the elastic part is propped against the lower convex shoulder.

Furthermore, the elastic element is a spring, the upper end of the spring is sleeved on the movable valve core, and the lower end of the spring is sleeved on the static valve core.

Further, in the gas flowing direction, a gas filtering mechanism is arranged behind the gas inlet.

Furthermore, the gas filtering mechanism is a filter screen.

Furthermore, the filter screen is arranged on a filter frame, the filter frame is arranged behind the air inlet, and the filter frame is pressed by the electromagnetic valve device.

Furthermore, a filtering rack step is arranged in an inner cavity of the shell at the air inlet, and the filtering rack is supported on the filtering rack step.

Furthermore, the lower end of the coil rack is provided with a pressing column which presses the filter rack.

Furthermore, the rear end of the electromagnetic valve device abuts against the bottom surface of the inner cavity of the shell, and the front end of the electromagnetic valve device abuts against the top surface of the inner cavity of the shell.

Furthermore, the shell comprises an upper shell and a lower shell which are tightly matched with each other, the air inlet pipe is arranged on the lower shell, the air outlet pipe is arranged on the upper shell, the upper shell is provided with a circle of supporting ribs, and the front end of the electromagnetic valve device is abutted against the supporting ribs; the bottom surface of the lower shell is provided with a circle of bearing blocks, and the rear end of the electromagnetic valve device is abutted against the bearing blocks.

Furthermore, still be equipped with solenoid valve casing outside solenoid valve device's the coil former, the coil former be located solenoid valve casing in, solenoid valve casing's front end with support the muscle and offset, solenoid valve casing's rear end support and be in the cushion block on.

Furthermore, solenoid valve casing include upper cover and valve barrel, the upper cover tightly join in marriage and install the valve barrel upper end, the movable valve core wear out the upper cover.

Furthermore, solenoid valve casing still include the lower cover, the lower cover tightly fit install the valve barrel lower extreme, the quiet valve core penetrate the lower cover in.

Furthermore, still be equipped with axial location muscle on the inside wall of inferior valve, solenoid valve casing's lateral wall with location muscle offset.

Furthermore, a wear-resistant sleeve is arranged between the movable valve core and the coil frame.

Furthermore, a wear-resistant sleeve is arranged between the movable valve core and the coil rack, and the wear-resistant sleeve is fixed on the upper cover.

Furthermore, after the coil of the electromagnetic valve device is electrified, the movable valve core is abutted against the static valve core after retreating.

Furthermore, a buffer element is arranged on the movable valve core, and the buffer element is abutted against the static valve core after the movable valve core retreats; or, the static valve core is provided with a buffer part, and the buffer part is abutted against the movable valve core after the movable valve core retreats.

Furthermore, a lower pressing block and a deformation block positioned below the lower pressing block are also arranged in the inner cavity of the shell, the lower pressing block and the deformation block are positioned on one side of the electromagnetic valve device, the electromagnetic valve device is provided with pins, and the pins penetrate into the deformation block; the upper shell presses the lower pressing block, and the lower pressing block presses the deformation block downwards.

Furthermore, a magnetic sleeve is arranged outside the static valve core.

Furthermore, a plug hole is formed in the static valve core, and the buffer piece is plugged into the plug hole.

Furthermore, the plug hole comprises a plug hole upper part, a plug hole middle part and a plug hole lower part, and the inner diameter of the plug hole middle part is smaller than the inner diameter of the plug hole upper part and the inner diameter of the plug hole lower part; the buffer piece comprises a buffer piece upper part matched with the plug hole upper part, a buffer piece middle part matched with the plug hole middle part and a buffer piece lower part positioned in the plug hole lower part.

Furthermore, the lower part of the buffer piece is provided with an anti-falling convex shoulder, and the anti-falling convex shoulder is abutted against the lower surface of the middle part of the plug hole.

Furthermore, the buffer part is made of flexible materials, and the lower surface of the anti-falling convex shoulder is an inclined surface which is inclined inwards from top to bottom.

The beneficial effects of the utility model reside in that: the structure is relatively simple, and the phenomenon of failure is not easy to occur.

Drawings

Fig. 1 is a schematic structural diagram of the present invention.

Fig. 2 is a cross-sectional view of the present invention when the solenoid valve device is not energized.

Fig. 3 is a cross-sectional view of the electromagnetic valve device according to the present invention after the electromagnetic valve device is energized.

Fig. 4 is a diagram showing the solenoid valve device and the gas filter mechanism.

Fig. 5 is a schematic structural view of the solenoid valve device in a top view.

Fig. 6 is a schematic structural view of the solenoid valve device from a bottom view.

Fig. 7 is a schematic view of the internal structure of the solenoid valve device in a top view.

Fig. 8 is a schematic view of the internal structure of the solenoid valve device from a bottom view.

Fig. 9 is a structural schematic view of the lower case.

Fig. 10 is a schematic structural view of the upper case.

Detailed Description

The present invention will be described in further detail with reference to the accompanying drawings and specific embodiments.

The utility model provides a novel carbon tank solenoid valve, includes shell 1, shell 1 have the inner chamber, with intake pipe 2, the outlet duct 3 of this inner chamber UNICOM, outlet duct 3 is the gas outlet with the inner chamber junction, intake pipe 2 is the air inlet with the junction of inner chamber.

The inner cavity is internally provided with an electromagnetic valve device, the electromagnetic valve device comprises a coil rack 4, a coil 5 is wound on the coil rack 4, a movable valve core 6 close to an air outlet and a static valve core 7 close to an air inlet are arranged in the coil rack 4, the movable valve core 6 is provided with a sealing piece 8 facing the air outlet, an elastic piece 9 used for resetting the movable valve core 6 is arranged between the movable valve core 6 and the static valve core 7, the elastic piece 9 acts on the movable valve core 6 so that the movable valve core 6 has a tendency of being close to the air outlet pipe 3, and the movable valve core 6 can move so that the movable valve core 6 is close to or far away from the air outlet pipe 3.

When the coil 5 of the electromagnetic valve device is not electrified, the movable valve core 6 is pushed out forwards under the action of the elastic piece 9, so that the sealing piece 8 seals the air outlet.

After the coil 5 of the electromagnetic valve device is electrified, the movable valve core 6 overcomes the elasticity of the elastic element 9 to retreat under the action of electromagnetic force, so that the sealing element 8 does not seal the air outlet.

In this embodiment, the sealing member 8 is disposed on the upper end surface of the movable valve element 6, and the specific installation manner is as follows: the upper end surface of the movable valve core 6 is provided with a downward concave caulking groove, the sealing element 8 is embedded into the caulking groove, in order to enable the sealing element to be installed more firmly, the inner wall of the caulking groove is also provided with a convex part or an inner concave part, the sealing element 8 is rubber, the rubber is vulcanized in the caulking groove, and after the rubber is vulcanized in the caulking groove, due to the existence of the convex part or the inner concave part in the caulking groove, the vulcanized rubber is combined with the caulking groove more tightly and is not easy to fall off. Of course, the sealing element 8 can also be fixed to the moving valve element in other ways, for example by gluing or the like. The sealing element is recommended to be flush with the upper end face of the movable valve core or protrude out of the caulking groove, and the sealing effect is better.

The sealing member 8 is usually made of rubber, but may be made of other materials, preferably flexible materials (such as silicone, etc.), and certainly not excluding hard materials (such as plastic, etc.).

In this embodiment, the movable spool 6 has an upper shoulder, the stationary spool 7 has a lower shoulder, the upper end of the elastic member 8 abuts against the upper shoulder, and the lower end of the elastic member 8 abuts against the lower shoulder. The elastic element 8 is usually a spring, and in order to make the spring more stable, it is recommended that the upper end of the spring is sleeved on the movable valve core 6, and the lower end of the spring is sleeved on the static valve core 7. Of course, the elastic member may be other elastic members than the spring.

In the present embodiment, an air filtering mechanism is provided behind the air inlet in the air flowing direction, and the filter net 10 is usually used as the air filtering mechanism, but other filtering components may be used. In this embodiment, the filter screen 10 is disposed on the filter frame 11, the filter frame 11 is disposed behind the air inlet, and the filter frame 11 is pressed by the electromagnetic valve device, so that the filter device is fixed. In this embodiment, the lower end of the coil frame 4 is provided with a pressing column 12, and the pressing column 12 presses the filter frame 11. In this embodiment, a filter frame step 13 is disposed in an inner cavity of the housing at the air inlet, and the filter frame 11 is supported on the filter frame step 13.

In this embodiment, the rear end of the electromagnetic valve device abuts against the bottom surface of the inner cavity of the housing 1, and the front end of the electromagnetic valve device abuts against the top surface of the inner cavity of the housing 1, so that the electromagnetic valve device is positioned in the inner cavity. In this embodiment, the housing 1 includes an upper housing 14 and a lower housing 15 that are tightly fitted to each other, and the upper housing 14 and the lower housing 15 may be assembled by using conventional methods such as interference socket, threaded connection, screw connection, and ultrasonic welding, which are well known to those skilled in the art and are not described herein again. The air inlet pipe 2 is arranged on the lower shell 15, the air outlet pipe 3 is arranged on the upper shell 14, the upper shell 14 is provided with a circle of supporting ribs 16, and the front end of the electromagnetic valve device is supported against the supporting ribs 16; a circle of bearing block 17 is arranged on the bottom surface of the lower shell 15, and the rear end of the electromagnetic valve device is abutted against the bearing block 17.

In this embodiment, the coil bobbin 4 of the electromagnetic valve device is further provided with an electromagnetic valve casing, the coil bobbin is located in the electromagnetic valve casing, the front end of the electromagnetic valve casing abuts against the abutting rib 16, and the rear end of the electromagnetic valve casing abuts against the bearing block 17. In this embodiment, the solenoid valve housing includes an upper cover 18 and a valve housing 19, the upper cover 18 is tightly fitted on the upper end of the valve housing 19, and the movable valve element 6 penetrates through the upper cover 18. The assembly between the upper cover 18 and the valve housing 19 may be achieved by conventional methods such as interference fit, threaded connection, screw connection, ultrasonic welding, etc., which are well known to those skilled in the art and will not be described herein.

The solenoid valve casing in this embodiment further includes a lower cover 20, the lower cover 20 is tightly fitted to the lower end of the valve housing 19, and the static valve element 7 penetrates the lower cover 20. The assembly between the lower cap 20 and the valve housing 19 may be achieved by conventional methods such as interference fit, threaded connection, screw connection, ultrasonic welding, etc., which are well known to those skilled in the art and will not be described herein.

In this embodiment, still be equipped with axial location muscle 21 on the inside wall of inferior valve 15, solenoid valve casing's lateral wall with the location muscle offset to it is more firm to make the solenoid valve device location.

In this embodiment, the wear-resistant sleeve 22 is arranged between the movable valve element 6 and the coil frame 5, and after the wear-resistant sleeve 22 is arranged, the wear between the movable valve element 6 and the coil frame 5 is reduced to the minimum degree, so that the service life is greatly prolonged. The wear sleeve 22 is preferably made of copper, although other materials may be used. The wear-resistant sleeve 22 in this embodiment is fixed on the upper cover 18, and the specific fixing mode is that the wear-resistant sleeve 22 is sleeved in the upper cover 18 and is in interference fit with the upper cover 18. The wear-resistant sleeve can be fixed by riveting, threaded connection, screw connection and the like. Of course, the wear-resistant sleeve can also be fixed on the coil rack or on the movable valve core.

In this embodiment, after the coil of the electromagnetic valve device is energized, the movable valve element 6 is moved backward and abuts against the stationary valve element 7, thereby controlling the stroke of the movable valve element 6.

In this embodiment, the movable valve core 6 is provided with a buffer member, the buffer member abuts against the stationary valve core 7 after the movable valve core 6 retreats, and the buffer member is preferably arranged on the lower end surface of the movable valve core 6; or, the stationary valve element 7 is provided with a buffer member 23, and after the movable valve element 6 retreats, the buffer member 23 abuts against the movable valve element 6. The buffer member 23 is typically rubber, although other flexible members may be used. After the buffering piece is arranged, when the movable valve core and the static valve core are in collision, noise cannot be generated. In this embodiment, the buffer member 23 is disposed on the stationary valve element 7, a plug hole is formed on the stationary valve element 7, and the buffer member 23 is plugged into the plug hole. In this embodiment, the plug hole comprises a plug hole upper part, a plug hole middle part and a plug hole lower part, and the inner diameter of the plug hole middle part is smaller than the inner diameter of the plug hole upper part and the inner diameter of the plug hole lower part; correspondingly, the bolster include with the bolster upper portion 27 of consent upper portion adaptation, with the bolster middle part 28 of consent middle part adaptation, be located the bolster lower part 29 of consent lower part, wherein bolster lower part 29 be equipped with anticreep convex shoulder 30, anticreep convex shoulder 30 with the lower surface at consent middle part is contradicted to prevent that the bolster from deviating from the consent, in this embodiment the bolster be flexible material, anticreep convex shoulder 30's lower surface is by last inclined plane of leanin from down, thereby make things convenient for bolster 23 top-down to fill in the consent in and make the anticreep convex shoulder be located the below at consent middle part.

In this embodiment, a lower pressing block 24 and a deformation block 25 located below the lower pressing block 24 are further disposed in the inner cavity of the housing, and the deformation block 25 is usually made of a flexible member such as rubber. The lower pressing block 24 and the deformation block 25 are positioned at one side of the electromagnetic valve device, the electromagnetic valve device is provided with a pin 26, and the pin 26 penetrates into the deformation block 25; the upper shell 14 presses the lower pressing block 24, and the lower pressing block 24 presses the deformation block 25 downwards, so that the deformation block 25 deforms, the purpose of clinging to the side wall of the inner cavity of the shell is achieved, and better sealing performance is obtained.

In this embodiment, the static valve element 7 is further sleeved with a flux sleeve 31, and after the flux sleeve 31 is arranged, the solenoid valve device can be started only by a small starting current.

Claims

1. A novel carbon tank electromagnetic valve comprises a shell, wherein the shell is provided with an inner cavity, an air inlet pipe and an air outlet pipe, the air inlet pipe is communicated with the inner cavity, the intersection of the air outlet pipe and the inner cavity is an air outlet, and the intersection of the air inlet pipe and the inner cavity is an air inlet;

the inner chamber in be equipped with the solenoid valve device, the solenoid valve device include the coil former, the coil former on around being equipped with coil, its characterized in that: a movable valve core close to the air outlet and a static valve core close to the air inlet are arranged in the coil rack, a sealing piece facing the air outlet is arranged on the movable valve core, an elastic piece used for resetting the movable valve core is arranged between the movable valve core and the static valve core, the elastic piece acts on the movable valve core so that the movable valve core has a tendency of being close to the air outlet pipe, and the movable valve core can move so that the movable valve core is close to or far away from the air outlet pipe;

2. A new canister solenoid valve as claimed in claim 1 wherein: the sealing element is arranged on the upper end surface of the movable valve core.

3. A new canister solenoid valve as claimed in claim 2 wherein: the upper end surface of the movable valve core is provided with a downward concave caulking groove, and the sealing element is embedded into the caulking groove.

4. A new canister solenoid valve as claimed in claim 3 wherein: the inner wall of the caulking groove is also provided with a convex part or an inner concave part, the sealing element is rubber, and the rubber is vulcanized in the caulking groove.

5. A new canister solenoid valve as claimed in claim 3 wherein: the sealing element is flush with the upper end surface of the movable valve core or protrudes out of the caulking groove.

6. A new canister solenoid valve as claimed in claim 1 wherein: the movable valve core is provided with an upper convex shoulder, the static valve core is provided with a lower convex shoulder, the upper end of the elastic piece is propped against the upper convex shoulder, and the lower end of the elastic piece is propped against the lower convex shoulder.

7. A new canister solenoid valve as claimed in claim 6 wherein: the elastic element is a spring, the upper end of the spring is sleeved on the movable valve core, and the lower end of the spring is sleeved on the static valve core.

8. A new canister solenoid valve as claimed in claim 1 wherein: and a gas filtering mechanism is arranged behind the gas inlet in the gas flowing direction.

9. A new canister solenoid valve as claimed in claim 8 wherein: the gas filtering mechanism is a filter screen.

10. A new canister solenoid valve as claimed in claim 9 wherein: the filter screen is arranged on a filter frame, the filter frame is arranged behind the air inlet, and the filter frame is pressed by the electromagnetic valve device.

11. A new canister solenoid valve as claimed in claim 10 wherein: and a filtering rack step is arranged in the inner cavity of the shell at the air inlet, and the filtering rack is supported on the filtering rack step.

12. A new canister solenoid valve as claimed in claim 10 wherein: the lower end of the coil rack is provided with a pressing column which presses the filter rack.

13. A new canister solenoid valve as claimed in any one of claims 1 to 12 wherein: the rear end of the electromagnetic valve device is abutted against the bottom surface of the inner cavity of the shell, and the front end of the electromagnetic valve device is abutted against the top surface of the inner cavity of the shell.

14. A new canister solenoid valve as claimed in claim 13 wherein: the shell comprises an upper shell and a lower shell which are tightly matched and sleeved with each other, the air inlet pipe is arranged on the lower shell, the air outlet pipe is arranged on the upper shell, the upper shell is provided with a circle of supporting ribs, and the front end of the electromagnetic valve device is abutted against the supporting ribs;

the bottom surface of the lower shell is provided with a circle of bearing blocks, and the rear end of the electromagnetic valve device is abutted against the bearing blocks.

15. A new canister solenoid valve as claimed in claim 14 wherein: the coil rack of the electromagnetic valve device is also provided with an electromagnetic valve casing, the coil rack is positioned in the electromagnetic valve casing, the front end of the electromagnetic valve casing is abutted against the supporting rib, and the rear end of the electromagnetic valve casing is abutted against the bearing block.

16. A new canister solenoid valve as claimed in claim 15 wherein: the electromagnetic valve shell comprises an upper cover and a valve sleeve, the upper cover is tightly assembled at the upper end of the valve sleeve, and the movable valve core penetrates out of the upper cover.

17. A new canister solenoid valve as claimed in claim 16 wherein: the solenoid valve casing still include the lower cover, the lower cover tightly fit install the valve barrel lower extreme, the quiet valve core penetrate the lower cover in.

18. A new canister solenoid valve as claimed in claim 15 wherein: still be equipped with axial location muscle on the inside wall of inferior valve, solenoid valve casing's lateral wall with location muscle offset.

19. A new canister solenoid valve as claimed in any one of claims 1 to 12 wherein: and a wear-resistant sleeve is arranged between the movable valve core and the coil rack.

20. A new canister solenoid valve as claimed in claim 16 wherein: and a wear-resistant sleeve is arranged between the movable valve core and the coil rack and is fixed on the upper cover.

21. A new canister solenoid valve as claimed in any one of claims 1 to 12 wherein: after the coil of the electromagnetic valve device is electrified, the movable valve core is abutted against the static valve core after retreating.

22. A new canister solenoid valve as claimed in claim 21 wherein: the movable valve core is provided with a buffer part, and the buffer part is abutted against the static valve core after the movable valve core retreats;

or, the static valve core is provided with a buffer part, and the buffer part is abutted against the movable valve core after the movable valve core retreats.

23. A new canister solenoid valve as claimed in any one of claims 14 to 18 wherein: a lower pressing block and a deformation block positioned below the lower pressing block are also arranged in the inner cavity of the shell, the lower pressing block and the deformation block are positioned on one side of the electromagnetic valve device, the electromagnetic valve device is provided with pins, and the pins penetrate into the deformation block;

the upper shell presses the lower pressing block, and the lower pressing block presses the deformation block downwards.

24. A new canister solenoid valve as claimed in any one of claims 1 to 12 wherein: and a magnetic sleeve is arranged outside the static valve core.

25. A new canister solenoid valve as claimed in claim 22 wherein: the static valve core is provided with a plug hole, and the buffer piece is plugged into the plug hole.

26. A new canister solenoid valve as claimed in claim 25 wherein: the plug hole comprises a plug hole upper part, a plug hole middle part and a plug hole lower part, and the inner diameter of the plug hole middle part is smaller than the inner diameter of the plug hole upper part and the inner diameter of the plug hole lower part;

the buffer piece comprises a buffer piece upper part matched with the plug hole upper part, a buffer piece middle part matched with the plug hole middle part and a buffer piece lower part positioned in the plug hole lower part.

27. A new canister solenoid valve as claimed in claim 26 wherein: the lower part of the buffer piece is provided with an anti-falling convex shoulder, and the anti-falling convex shoulder is abutted to the lower surface of the middle part of the plug hole.

28. A new canister solenoid valve as claimed in claim 27 wherein: the buffering piece is made of flexible materials, and the lower surface of the anti-falling convex shoulder is an inclined surface which is inclined inwards from top to bottom.