CN103047470B - Canister control valve - Google Patents
Canister control valve Download PDFInfo
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- CN103047470B CN103047470B CN201210559188.4A CN201210559188A CN103047470B CN 103047470 B CN103047470 B CN 103047470B CN 201210559188 A CN201210559188 A CN 201210559188A CN 103047470 B CN103047470 B CN 103047470B
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- coil
- armature
- control valve
- coil rack
- valve seat
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Abstract
This application discloses a kind of canister control valve, including upper cover and housing.There is in upper cover a through hole in Laval tube shape.There is magnetic tank, coil rack, coil, contact pin, magnetic core, armature and valve seat in the housing.There is inside described magnetic tank a cavity.Described coil rack, coil and contact pin are installed in described cavity jointly.Described coil rack has a hollow axle.The hollow axle that described coil is wound on coil rack is peripheral.Described contact pin is fixed on coil rack.The copper cash of coil is electrically connected with one end of contact pin.Described magnetic core is positioned in the hollow axle of coil rack, and and magnetic tank between to be screwed.Being respectively provided with armature and valve seat on coil rack, described valve seat central authorities have the radial through hole in cross section.There is between magnetic core and armature spring.The application have employed Laval tubular construction, it is possible to overcomes the pressure differential at canister control valve two ends, and realizes relatively stable gas flow.
Description
Technical field
The application relates to the canister control valve (TEV) in a kind of gasoline evaporative emission control system.
Background technology
Gasoline evaporative emission control system system includes canister and canister control valve.Canister absorbs the fuel vapor from fuel tank,
Until fuel-steam is saturated.Electronic controller controls canister control valve and opens, and the fuel oil that fresh air is saturated with canister steams
Vapour forms regeneration air stream.Regeneration air stream is inhaled into cylinder from air inlet pipe and participates in burning.This system is possible not only to avoid fuel oil to steam
Vapour escapes into air thus reduces discharge, and also reduces oil consumption.
US granted patent US4901974A (grant date: February 20 nineteen ninety) discloses a kind of canister control valve,
The program can carry out basic flow-control to the fresh air flowing through canister control valve, but there is following room for improvement.
Common canister control valve is sent pulsewidth modulation letter by solenoid controlled aperture, electronic controller to this solenoid
Number, the dutycycle of this pulse-width signal determines the aperture of canister control valve.Flow through the fresh air of canister control valve
Flow and two factors about: one is the aperture of canister control valve, and two is the pressure differential at canister control valve two ends.At pressure
In the case of difference is constant, aperture is the biggest, and gas flow is the biggest.In the case of constant opening degree, pressure differential is the biggest, gas
Flow is the biggest；But when pressure differential is greatly to after certain value, and flow tends towards stability.
For system controls angle, it is desirable to the flow of the fresh air flowing through canister control valve is only received with solenoid
The dutycycle of the pulse-width signal arrived is relevant, is so easy to accurately control.That is, it is desirable to pulse-width signal is protected
When holding a certain dutycycle, the change of pressure differential is the smaller the better on the impact of gas flow.In order to ensure to be precisely controlled carbon
Tank control valve, also requires in the case of pulse-width signal has little dutycycle (such as ＜ 10%), and gas flow limits
System is in the less margin of tolerance (such as ± 1L/min).Existing canister control valve is difficult to meet these requirements.
Summary of the invention
Technical problems to be solved in this application are to provide a kind of canister control valve, it is possible to avoid pressure at two ends to greatest extent
The difference impact on gas flow, and gas flow can be limited in the case of the pulse-width signal of little dutycycle
In the less margin of tolerance.
For solving above-mentioned technical problem, the application canister control valve includes upper cover and housing；There is in upper cover one in drawing
Cut down the through hole of your tube shape；There is magnetic tank, coil rack, coil, contact pin, magnetic core, armature and valve seat in the housing；
There is inside described magnetic tank a cavity；Described coil rack, coil and contact pin are installed in described cavity jointly；
Described coil rack has a hollow axle；The hollow axle that described coil is wound on coil rack is peripheral；Described contact pin is fixed on
Coil rack；The copper cash of coil is electrically connected with one end of contact pin；
Described magnetic core is positioned in the hollow axle of coil rack, and and magnetic tank between to be screwed；
Being respectively provided with armature and valve seat on coil rack, described valve seat central authorities have the radial through hole in cross section；
There is between magnetic core and armature spring.
The application canister control valve first-selection has the gas flow optimized function of traditional product, and is made that innovation on this basis.
One is to have employed Laval tubular construction, it is possible to overcomes the pressure differential at canister control valve two ends, and realizes relatively stable gas
Flow.Two is to pass through threaded adjusting between magnetic core and magnetic tank, thus ensure that under the pulse-width signal of little dutycycle
Gas flow meets tolerance.Three is that valve seat through-hole uses radial cross sectional shape so that it is in the condition that area is certain
Lower girth is longer.
Accompanying drawing explanation
Fig. 1 is the Each part decomposing schematic representation (Each part of a specific embodiment of the application canister control valve
Size disproportionate)；
Fig. 2 is the generalized section after the Each part installation of a specific embodiment of the application canister control valve；
Fig. 3 is the schematic top plan view that armature is installed on coil rack；
Fig. 4 is the schematic perspective view that armature is installed on coil rack；
Fig. 5 is the schematic perspective view that valve seat is installed on coil rack together with armature；
Fig. 6 is the multiple example of the radial cross sectional shape of valve seat center through hole；
Fig. 7 is armature schematic diagram in gap between armature and valve seat when opening.
Description of reference numerals in figure:
10 is upper cover；100 is upper cover through hole；25 is the first sealing ring；20 is housing；21 is magnetic tank；210 is spiral shell
Stricture of vagina；22 is coil rack；220 is limited post；221 is main body；222 is connecting portion；23 is coil；24 is contact pin；
11 is the second sealing ring；26 is magnetic core；27 is spring；28 is armature；29 is valve seat；210 is female thread；290
For valve seat through-hole；30 is gap.
Detailed description of the invention
Referring to Fig. 1 and Fig. 2, this is a specific embodiment of the application canister control valve.Described canister control valve bag
Including upper cover 10 and housing 20, both are connected with each other by welding and keep sealing.There is in upper cover 10 one cut down in drawing
The through hole 100 of your pipe (de Laval nozzle) shape.The sectional area of Laval pipe first diminishes and becomes big again, logical from centre
The gas crossed can be accelerated.Having two pipelines below housing 20, the second pipe on right side is gas circulation duct,
First pipeline in left side is for installing the connector of contact pin 24 lower end.Right flank at housing 20 has at one protruding, is
For place the skeleton of rubber have within the casing 20 magnetic tank 21, coil rack 22, coil 23, contact pin 24,
Magnetic core 26, armature 28 and valve seat 29.
Described magnetic tank 21 the most in the form of a ring, has a cavity inside it, this cavity is in the upper surface of magnetic tank 21 and lower end
Face is respectively provided with a big opening and at least one little opening.Described big opening is used for hookup wire coil assembly.Described little opening
For fixed magnetic core 26.
Described coil rack 22, coil 23 and contact pin 24 collectively referenced as coil block.This coil block is with interference fit side
Formula is mounted and fixed on the cavity within magnetic tank 21 from the big opening of magnetic tank 21.
Referring to Fig. 5, described coil rack 22 is made up of main body 221 and connecting portion 222 two parts.Described main body 221
Two parallel upper and lower end faces are connected by a hollow axle.Through hole within described hollow axle and the little opening of magnetic tank 21
Position corresponding, both of which is used for installing magnetic core 26.Described connecting portion 222 is downward from the side of main body 221 lower surface
Protrude, for fixing and connecting contact pin 24.The hollow axle that described coil 23 is wound on the main body 221 of coil rack 22 is peripheral,
Such as pass through coil winding machine.Described contact pin 24 is fixed on connecting portion 222 lower end of coil rack 22, notes for example with inserts
Mould (insert molding) technique.One end of coil 23 and the contact pin 24 wherein upper end of welds together, separately
One end welds together with the upper end of another root of contact pin 24；Housing is stretched out in the lower end of two contact pins 24, forms connector.
Contact pin 24 is by keeping sealing between the first ring-type sealing ring 25 and the first insides of pipes wall of housing 20.
In the through hole within hollow axle of the main body 221 that described magnetic core 26 is positioned at coil rack 22, and extend to magnetic tank 21
Little opening in.The bottom of magnetic core 26 has external screw thread, and the little opening part of magnetic tank 21 has female thread 210, both with
This fixes and connects, and scribbles fastening glue with locking.
Refer to Fig. 3 and Fig. 4, there is on coil rack 22 armature 28.Specifically, at coil rack 22
Having the many limited posts raised up 220 on upper surface, armature 28 is just stuck in these limited posts 220.Armature 28
Can move up and down along the direction of limited post 220, but be defined as moving or to be confined to less fortune at horizontal plane
Dynamic scope.Preferably, armature 28 is clipped layer of metal thin slice by two-layer rubber, and three is molded together.For ensureing
Shooting Technique, there are through hole in the central authorities of armature 28, and during to ensure injection, two panels rubber forms circulation.After being molded this
Through hole is filled up by rubber.During coil 23 power-off, the upper surface of upper rubber is formed with valve seat 29 lower surface and seals；In rank
Ferrum 28 along limited post 220 move up and down time, underlying rubber then play buffering noise reduction effect.
There is between magnetic core 26 and armature 28 spring 27.The upper diameter of magnetic core 26 reduces and has a step,
The lower end of spring 27 is just bearing on this step, and all sides of spring 27 are the outer wall of magnetic core 26 and leading to of coil rack 22
Hole sidewall, the upper end of spring 27 props up the lower surface of armature 28.
Refer to Fig. 5, there is on armature 28 valve seat 29.Specifically, the lower surface of valve seat 29 is just arranged on this
On a little limited posts 220, the upper surface of valve seat 29 is then by keeping close between ring-type the second sealing ring 11 and upper cover 10
Envelope.Having a through hole 290 in valve seat 29 central authorities, its horizontal cross sectional geometry is radially.Described second sealing ring 11
It is positioned in the cannelure of upper cover 10.Valve seat through-hole 290 communicates with upper cover through hole 100.
The work process of described canister control valve is as follows:
When coil 23 power-off, armature 28 fits tightly shape with valve seat 29 under the effect of spring 27 and intake pipe negative pressure
Become to seal, stop gas flowing, referred to as closed mode.
When coil 23 is energized, form closed magnetic field by magnetic core 26, magnetic tank 21 and armature 28.Armature 28 is at electromagnetism
Overcome spring 27 and negative pressure to move downward under the effect of power, until with magnetic core 26 adhesive, referred to as opening.Refer to
Fig. 7, now gas second pipe bottom housing 20 enters housing 20, then by armature 28 and valve seat 29 it
Between gap 30 through hole 100 in Laval tube shape from upper cover 10 again in flow out.
Electronic controller sends the pulse-width signal of constant period to coil 23, by changing accounting for of pulse-width signal
Empty ratio, it is possible to control the gas flow by canister control valve.When dutycycle is 100%, armature 28 is opened all the time,
Canister control valve reaches maximum stream flow.
When armature 28 is opened, the maximum stream flow of canister control valve is determined by two factors: one is on gap 30, two is
Lid through hole 100.The application, in order to reduce the throttle effect in gap 30 as far as possible, takes two approach: increase the most as far as possible
Big distance between armature 28 and valve seat 29, strengthens the girth of valve seat through-hole 290 the most as far as possible.Just strengthen week
For length, although simply increase described valve seat through-hole 290 area it is achieved that but the biggest via area also can lead
Cause negative pressure suffered when armature 28 is closed excessive, affect normally opening of armature 28.It is thus desirable in via area one
Its girth is strengthened as far as possible under conditions of Ding.The application devises the through hole of multiple radial sectional area as shown in Figure 6, is
To extending around a plurality of lonizing radiation centered by a manhole, the end of these lonizing radiation may be designed in circle,
Manhole can also be designed to circular shape with the connecting portion of lonizing radiation, thus reach area and necessarily but strengthen girth
Purpose.By above design, the maximum stream flow of the application canister control valve is only by the Laval tube shape in upper cover 10
Through hole 100 determines.The Laval pipe sectional area in middle a certain position is minimum, has minimum sectional area；From the beginning of at this
It is gradually increased to the sectional area at two ends.The flow of Laval pipe is just determined by its minimum sectional area, by use different
The Laval pipe of small cross-sectional area, it is possible to adjust the maximum stream flow of canister control valve.Meanwhile, the characteristic of Laval pipe determines
Gas flows through during Laval pipe accelerated so that it is can overcome the two ends of canister control valve to have the impact of pressure differential, and
Realize stable maximum stream flow.
Owing to the bottom of magnetic core 26 is connected threadably with the little opening part of magnetic tank 21, thus just it is provided with adjustment
Leeway.When producing, at the gas flow outlets of above-mentioned valve seat 29, pass to certain negative pressure, and send to coil 23
The pulse-width signal of little dutycycle, by rotating the screw thread degree of depth during i.e. adjustable magnetic core 26 extends to magnetic tank 21, from
And gas flow is modulated the value specified, make gas flow meet the less margin of tolerance.
These are only the preferred embodiment of the application, be not used to limit the application.For a person skilled in the art,
The application can have various modifications and variations.All within spirit herein and principle, any amendment of being made, equivalent
Replacement, improvement etc., within should be included in the protection domain of the application.
Claims (8)
1. a canister control valve, including upper cover and housing；There is magnetic tank, coil rack, coil in the housing, insert
Pin, magnetic core, armature and valve seat；
There is inside described magnetic tank a cavity；Described coil rack, coil and contact pin are installed in described cavity jointly；
Described coil rack has a hollow axle；The hollow axle that described coil is wound on coil rack is peripheral；Described contact pin is fixed on
Coil rack；The copper cash of coil is electrically connected with one end of contact pin；Described magnetic core is positioned in the hollow axle of coil rack, and
And to be screwed between magnetic tank；It is characterized in that:
There is in upper cover a through hole in Laval tube shape；
Being respectively provided with armature and valve seat on coil rack, described valve seat central authorities have the radial through hole in cross section；
There is between magnetic core and armature spring.
Canister control valve the most according to claim 1, is characterized in that, when the coil is de-energized, armature is tight with valve seat
Closely connected conjunction forms sealing, stops gas flowing；
When the coil is energized, magnetic core, magnetic tank and armature form closed magnetic field, armature motion to magnetic core adhesive；This seasonal epidemic pathogens
Body is flow through by the gap between armature and valve seat, and flows out in the through hole in Laval tube shape from upper cover.
Canister control valve the most according to claim 1, is characterized in that, has many on the upper surface of coil rack
The limited post that root raises up, described armature is just stuck in these limited posts, and the direction only along limited post moves up and down.
Canister control valve the most according to claim 1, is characterized in that, the top of magnetic core has a step, institute
The lower end stating spring is just bearing on this step, and all sides of spring are the outer wall through-hole side walls with coil rack of magnetic core, bullet
The upper end of spring props up the lower surface of armature.
Canister control valve the most according to claim 3, is characterized in that, the lower surface of described valve seat is arranged on these
On limited post, the upper surface of valve seat is then by keeping sealing between ring-type the second sealing ring and upper cover.
Canister control valve the most according to claim 1, is characterized in that, described contact pin is by the first ring-type sealing
Keep between circle and the first insides of pipes wall of housing sealing.
Canister control valve the most according to claim 5, is characterized in that, described second sealing ring is positioned at the ring of upper cover
In shape groove.
Canister control valve the most according to claim 1, is characterized in that, leading to of the radially cross section of described valve seat
Hole is to extending around a plurality of lonizing radiation centered by a manhole.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201210559188.4A CN103047470B (en) | 2012-12-20 | 2012-12-20 | Canister control valve |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201210559188.4A CN103047470B (en) | 2012-12-20 | 2012-12-20 | Canister control valve |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| CN103047470A CN103047470A (en) | 2013-04-17 |
| CN103047470B true CN103047470B (en) | 2016-08-24 |
Family
ID=48060227
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201210559188.4A Active CN103047470B (en) | 2012-12-20 | 2012-12-20 | Canister control valve |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN103047470B (en) |
Families Citing this family (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN113357377A (en) * | 2020-03-04 | 2021-09-07 | 纬湃汽车电子(芜湖)有限公司 | Carbon tank solenoid valve |
Citations (7)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US4986246A (en) * | 1988-12-31 | 1991-01-22 | Robert Bosch Gmbh | Valve for the metered admixture of volatilized fuel to the fuel-air mixture of an internal combustion engine |
| CN2532313Y (en) * | 2002-03-22 | 2003-01-22 | 哈尔滨志阳汽车电气股份有限公司 | Carbon pot electromagnet valve |
| CN2533343Y (en) * | 2002-03-22 | 2003-01-29 | 哈尔滨志阳汽车电气股份有限公司 | Carbon tank solenoid valve |
| DE10222218A1 (en) * | 2002-05-16 | 2003-12-04 | Freudenberg Carl Kg | magnetic valve |
| CN1580617A (en) * | 2003-08-08 | 2005-02-16 | 卡尔弗罗伊登柏格两合公司 | Electromagnetic valve |
| DE202004007497U1 (en) * | 2004-05-11 | 2005-09-22 | A. u. K. Müller GmbH & Co KG | Hot water extraction device on hot water tank has valve housing and solenoid system arranged so that solenoid valve's longitudinal axis includes with the vertical viewed in upwards direction an angle of between 90 and 180 degrees |
| CN2773416Y (en) * | 2005-01-17 | 2006-04-19 | 哈尔滨志阳汽车电气股份有限公司 | Electromagnetic valve of carbon pot |
-
2012
- 2012-12-20 CN CN201210559188.4A patent/CN103047470B/en active Active
Patent Citations (7)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US4986246A (en) * | 1988-12-31 | 1991-01-22 | Robert Bosch Gmbh | Valve for the metered admixture of volatilized fuel to the fuel-air mixture of an internal combustion engine |
| CN2532313Y (en) * | 2002-03-22 | 2003-01-22 | 哈尔滨志阳汽车电气股份有限公司 | Carbon pot electromagnet valve |
| CN2533343Y (en) * | 2002-03-22 | 2003-01-29 | 哈尔滨志阳汽车电气股份有限公司 | Carbon tank solenoid valve |
| DE10222218A1 (en) * | 2002-05-16 | 2003-12-04 | Freudenberg Carl Kg | magnetic valve |
| CN1580617A (en) * | 2003-08-08 | 2005-02-16 | 卡尔弗罗伊登柏格两合公司 | Electromagnetic valve |
| DE202004007497U1 (en) * | 2004-05-11 | 2005-09-22 | A. u. K. Müller GmbH & Co KG | Hot water extraction device on hot water tank has valve housing and solenoid system arranged so that solenoid valve's longitudinal axis includes with the vertical viewed in upwards direction an angle of between 90 and 180 degrees |
| CN2773416Y (en) * | 2005-01-17 | 2006-04-19 | 哈尔滨志阳汽车电气股份有限公司 | Electromagnetic valve of carbon pot |
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| Publication number | Publication date |
|---|---|
| CN103047470A (en) | 2013-04-17 |
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