CN207762261U - A kind of solenoid electric valve - Google Patents

Abstract

Utility model is related to a kind of solenoid electric valve, it is improved on the basis of existing valve body, spool, control mouth and air inlet, outlet passageway, control mouth is designed to bore gradual increased conical opening from the bottom up, and the small-bore of the bottom of the conical opening is connected with inlet channel, the heavy caliber on the top of the conical opening is connected with outlet passageway, and the head of spool is then designed to and the matched taper platform of the conical opening.With the above structure, when pressure-air air inlet, the conical opening will swimmingly enter in outlet passageway conducive to the high pressure gas in inlet channel, when simultaneously in off position, the active force of spring is again consistent in the direction of power (this power is also referred to as back pressure) on spool with the fluid matasomatism in outlet passageway, so, spool is enable reliably to close control mouth, control mouth can be made to close more tight, urea solution so as to be effectively prevented in outlet passageway backflows into valve chamber and inlet channel, it is ensured that the utility model works stably in a long term.

Description

A kind of solenoid electric valve

Technical field

The utility model is related to the technical fields of valve, refer specifically to a kind of solenoid electric valve.

Background technology

Solenoid electric valve is also known as regulating valve, including single seat series solenoid electric valve, two-seater series solenoid electric valve, sleeve system Row solenoid electric valve and self-operated type series solenoid electric valve etc. are a variety of.Since solenoid electric valve has simple in structure and reliable in action The features such as, thus be widely used in each technical field.

Wherein in the technical field of vehicle maintenance service, when the tail gas that automobile generates enters the vent gas treatment system of the automobile When the air inlet pipe of system, quantitative urea solution is injected to air inlet with mist form by the urea injection unit by air inlet pipe Guan Zhong, hydrolysis and pyrolytic reaction occur in tail gas and under the action of high-temperature tail gas for urea droplets, final to realize to tail gas Processing.Solenoid electric valve will be used in injection unit among these, which is the spray for controlling pressure-air Go out so that negative pressure is generated in urea solution spout when pressure-air sprays, to drive urea solution to enter in air inlet pipe.

Existing above-mentioned solenoid electric valve includes valve body and spool, has inlet channel and outlet passageway in valve body, Control mouth in the valve chamber that the inlet channel passes through valve inner with outlet passageway is connected；Spool is mounted in the valve chamber and covers Equipped with making spool always with the spring that can close control mouth trend, the spool after installation is located in valve body by fixed plate On.But the solenoid electric valve is found during being applied to above-mentioned vehicle maintenance service, due to being the effect by spring when closing Spool is got lodged in into control mouth, therefore when the pressure of outlet pipe is higher, the active force of spring will be overcome and spool is open-top, So that urea solution, which is flow backwards, enters valve inner, and the urea solution of valve inner is flowed backward in the stagnation of automobile long-time or temperature It can crystallize in valve inner in the case of higher, to influence the closing performance of solenoid electric valve, and then vent gas treatment can be produced It is raw to influence.Furthermore existing fixed plate is fixed together with valve body by multiple screws, and there is this assembling mode assembling to imitate How the disadvantage that rate is low, production cost is high improves production efficiency, reduces life in face of employment cost higher and higher today Cost is produced, is always the problem that manufacturing enterprise faces.

Therefore it needs further to improve for existing such solenoid electric valve.

Utility model content

Technical problem to be solved in the utility model is to be directed to the prior art, and providing a kind of effectively can avoid urea solution from falling Stream enters the solenoid electric valve in valve body.

Technical solution is used by the utility model solves above-mentioned technical problem：A kind of solenoid electric valve includes valve Body and spool in the valve body there is valve chamber and inlet channel and outlet passageway, the inlet channel and outlet passageway to pass through Control mouth in valve chamber is connected, and the spool is mounted in the valve chamber, and the valve core upper sleeve, which is equipped with, makes spool have always The spring that the control mouth trend stated in residence can be closed, the spool after installation are located in by fixed plate on the valve body, It is characterized in that：The control mouth is designed to bore gradually increased conical opening, and the osculum of the bottom of the conical opening from the bottom up Diameter is connected with the inlet channel, and the heavy caliber on the top of the conical opening is connected with the outlet passageway, the valve The head of core is then designed to and the matched taper platform of the conical opening.

In the above scheme, further improved to be, it assembles for convenience, the fixing board card is connected on the top of the valve body Portion.

In above-mentioned improvement project, it is preferred that in the two opposite side walls at the top of the upper valve body respectively with relatively The side of the fixed plate answered is provided with mutually matched fixture block and grab between, and the fixed plate is matched by the grab and fixture block It closes and is connected on the valve body, i.e., by the cooperation of grab and fixture block, and fixed plate is enable rapidly to be assembled integrally with valve body, When assembling, assembling operation can be completed without in tool, manually pressing fixed plate, therefore high with packaging efficiency, Light advantage is assembled, while can also be convenient for the maintenance in the future of solenoid electric valve.

In the above scheme, it is further preferred that, prolong vertically upward respectively in the left and right side walls at the top of the valve body It stretches and forms vertical projections, the apical margin level of the vertical projections extends internally and forms above-mentioned grab, and pair of the fixed plate The edge recess that should locate and form above-mentioned fixture block, to facilitate the processing and manufacturing of the clamping structure.

In above-mentioned preferred embodiment, the abutting end of the fixture block and grab has the lower guiding surface that guiding grab slides into, In order to which grab easily mutually hooks conjunction with fixture block.

Similarly, further improved to be, the abutting end of the fixture block and grab has upper guiding surface, makes the fixture block The thickness of abutting end is tapered into grab direction side.

It is preferred that the aperture of the inlet channel is less than the aperture of outlet passageway, can so be obtained very with conical opening Good linking, and be conducive to gas and swimmingly flow out, and can further prevent flowing backwards the appearance of phenomenon again.

Compared with prior art, since the spool of the utility model and control mouth are designed to mutually matched conical opening and cone Shape platform, thus solenoid electric valve open when, i.e., when air inlet, the conical opening by conducive to the gas in inlet channel swimmingly Enter in outlet passageway, while when Electromagnetic Control valve closing state, the active force of spring again with the fluid in outlet passageway The direction of the power (this power is known as back pressure) acted on spool is consistent, so so that spool can reliably close control mouth, i.e., Just there is higher pressure in outlet passageway, control mouth can only also closed more tight, so as to be effectively prevented outlet Urea solution in channel backflows into valve chamber and inlet channel, it is ensured that the utility model can work stably in a long term.

Description of the drawings

Fig. 1 is the structural schematic diagram of the utility model embodiment；

Fig. 2 is the enlarged drawing of I part in Fig. 1；

Fig. 3 is the vertical view of fixed plate in Fig. 1.

Specific implementation mode

The utility model is described in further detail below in conjunction with attached drawing embodiment.

As shown in Figure 1 to Figure 3, the solenoid electric valve include valve body 1, spool 2 and fixed plate 3 and coil (in figure not Show), wherein there is valve chamber 11, inlet channel 12 and outlet passageway 13, inlet channel 12 and outlet passageway 13 pass through in valve body 1 Control mouth A in valve chamber 11 is connected, on the present embodiment, air inlet that inlet channel 12 and outlet passageway 13 are connected with the external world, Gas outlet is respectively positioned on the bottom of valve body 1, and the aperture of inlet channel 12 is less than the aperture of outlet passageway 13；It opens at the top of valve body 1 Equipped with the mounting hole 14 communicated with above-mentioned valve chamber.Above-mentioned fixed plate 3, which is covered, is located at the top of valve body 1, and be provided in the fixed plate 3 with The corresponding through-hole of mounting hole 31.In the present embodiment, above-mentioned spool 2 sealingly extends through through-hole 31 and mounting hole 14 and pacifies successively Loaded in valve chamber 11, while spring 4 being installed on the spool 2, which can make spool 2 always and have the trend that moves down and energy It closes the control mouth A that states of residence, in the present embodiment, mainly above-mentioned control mouth A is improved, i.e., is designed control mouth A At bore gradual increased conical opening from the bottom up, and small-bore and the inlet channel 12 of the bottom of the conical opening is connected, this The heavy caliber on the top of conical opening is connected with outlet passageway 13, and the head of spool 2 is then designed to matched with the conical opening Taper platform.When it is applied to vehicle maintenance service, coil can be made to obtain electric, spool 2 moves up, and opens control mouth；And coil is disconnected Under electricity condition, closing control mouth A under the action of spring 4 of spool 2, if at this point, the Fluid pressure in outlet passageway is higher, outlet Fluid matasomatism in channel is consistent with the force direction of spring identical in the power (this power is also referred to as back pressure) on spool so that valve Core more reliably closes control mouth, i.e. control mouth is closed more tight, so as to be effectively prevented in outlet passageway Urea solution backflow into valve chamber.

In order to facilitate the installation of, above-mentioned fixed plate 3 is to be connected to the top of the valve body 1, i.e., on the side wall at the top of valve body 1 With the side of corresponding fixed plate 3 mutually matched fixture block and grab are provided between.In the present embodiment, for further letter Change structure, convenient for assembly, there are two grabs 15, is located in the left and right sidewall of valve body 1, that is, at the top of valve body 1 Extend vertically upward respectively in left and right side walls and form vertical projections 16, the apical margin level of each vertical projections extends internally and shape At above-mentioned grab 15, and the edge of the corresponding position of fixed plate 3 stamps out downwards recess, which forms above-mentioned fixture block 32.In order to It is closed so that grab 15 is easy to hook with fixture block 32, the lower guiding that there is the abutting end of fixture block 32 and grab 15 guiding grab 15 to slide into is oblique Face 33, while there is upper guiding surface 34 in the abutting end of fixture block 32 and grab 15, make the thickness of the abutting end of fixture block 32 in court It is tapered into 15 direction of grab.

When installation, as long as the fixture block 32 in the fixed plate 3 of one end is inserted into the gap between 1 top of grab 15 and valve body Place, then the other end of fixed plate 3 is pressed, the grab 15 at this slides into through lower guiding surface 33 at this time, and under selfer power It hooks and closes on the edge of corresponding fixture block 32, therefore assemble up very convenient.And after installing, the upper surface of fixed plate 3 Mutually maintain an equal level with 1 top of valve body so that overall structure is more stablized, and shape is also beautiful.

Claims (7)

1. Include valve body (1) and spool (2) 1. a kind of solenoid electric valve, have in the valve body (1) valve chamber (11) and into Gas channel (12) and outlet passageway (13), the inlet channel (12) and outlet passageway (13) pass through control mouth (A) phase in valve chamber Connection, the spool (2) are mounted on the valve chamber (11), and being arranged on the spool (2), which makes spool (2) have always, to close The spring (4) of control mouth (A) trend that residence is stated, the spool (2) after installation are located in the valve body by fixed plate (3) (1) on, it is characterised in that：The control mouth (A) is designed to bore gradually increased conical opening, and the conical opening from the bottom up The small-bore of bottom is connected with the inlet channel (12), the heavy caliber on the top of the conical opening and the outlet passageway (13) it is connected, the head of the spool (2) is then designed to and the matched taper platform of the conical opening.
2. 2. solenoid electric valve according to claim 1, it is characterised in that：The fixed plate (3) is connected to the valve body (1) Top.
3. 3. solenoid electric valve according to claim 2, it is characterised in that：The two opposite side walls at the top of the valve body (1) Upper to be provided with mutually matched fixture block and grab between with the side of corresponding fixed plate (3) respectively, the fixed plate (3) is logical It crosses the cooperation of the grab (15) and fixture block (32) and is connected on the valve body (1).
4. 4. solenoid electric valve according to claim 3, it is characterised in that：In the left and right side walls at the top of the valve body (1) Extend vertically upward respectively and form vertical projections (16), the apical margin level of the vertical projections extends internally and forms above-mentioned grab (15), the edge recess of the corresponding position of the fixed plate (3) and form above-mentioned fixture block (32).
5. 5. solenoid electric valve according to claim 4, it is characterised in that：The abutting end of the fixture block (32) and grab (15) The lower guiding surface (33) slid into guiding grab (15).
6. 6. solenoid electric valve according to claim 5, it is characterised in that：The abutting end of the fixture block (32) and grab (15) With upper guiding surface (34), the thickness of the abutting end of the fixture block (32) is made to be tapered into grab (15) direction side.
7. 7. according to the solenoid electric valve described in claim 1 to 6 any claim, it is characterised in that：The inlet channel (12) aperture is less than the aperture of outlet passageway (13).