CN102493895A

CN102493895A - Compressed natural gas ejector

Info

Publication number: CN102493895A
Application number: CN2011104437432A
Authority: CN
Inventors: 暴志平; 刘戈
Original assignee: BEIJING AINI MECHANOELECTRIC Co Ltd
Current assignee: BEIJING AINI MECHANOELECTRIC Co Ltd
Priority date: 2011-12-27
Filing date: 2011-12-27
Publication date: 2012-06-13

Abstract

The invention discloses a compressed natural gas ejector. The compressed natural gas ejector comprises an ejector shell, a valve seat, an armature, springs, coils, coil shells, stop iron and an electric plug; the cross section of the armature has a square shape of which the four corners are transition circular arcs; all the transit circular arcs are positioned on the same circle; the armature is provided with an axial blind hole with an upward opening; the central line of the axial blind hole is coincided with that of the armature; the bottom of the axial blind hole is positioned at the upper end of the armature; the upper end of the armature is provided with fours side holes which are communicated with the axial blind hole and face an outward lower direction; the central lines of the four side holes are uniformly distributed on the same conical surface of which the vertex is positioned on the central line of the axial blind hole; two parallel side planes of the armature are vertically divided by a plane where the relative central lines of the two side holes are equally; and outlets of the side holes are positioned on the outer side of the upper end of the armature. The compressed natural gas ejector has the advantages of high stability in gas supply, and long service life.

Description

Compressed natural gas injector

Technical field

The fuel that the present invention relates to a kind of compressed natural gas gas engine is supplier at regular time and quantity, refers to a kind of compressed natural gas injector especially.

Background technique

Utilizing rock gas to replace oil to act as a fuel, is the desirable feasible method of improving energy resource structure, reducing pollution and practice thrift cost.Sparger is the vitals of motor, and its effect is with gaseous fuel supply engine at regular time and quantity.Compressed natural gas injector of the prior art (as shown in Figure 1), it comprises: case of sprayer 1, valve seat 2, armature 3, spring 4, coil 5, coil case 6, buting iron 7 and electric connector 8; Case of sprayer 1 is inserted in the hole of coil 5 with buting iron 7, and coil case 6 is enclosed within outside the coil 5, closes up coil case 6, coil 5, buting iron 7 and case of sprayer 1 four are connected as one in roller limit, coil case 6 two ends; Valve seat 2, armature 3 and spring 4 are located in the endoporus of case of sprayer 1 from bottom to top successively, valve seat 2 and case of sprayer 1 bolt, and spring 4 heads on the upper end of armature 3 and the lower end of buting iron 7; Buting iron 7 is provided with axial hole 12; Armature 3 is cylindrical, and the lower end of armature 3 is to form a cavity volume between the inwall of the reverse frustoconic lower end outer surface and the case of sprayer 1 that make armature 3, armature 3 be provided with opening up axial blind hole 9; The bottom of axial blind hole 9 is positioned at the lower end of armature 3; Armature 3 lower ends are provided with a pair of sidewise hole 10 of the one-tenth splayed shape distribution that is connected with axial blind hole 9, and the opening of sidewise hole 10 is positioned on the curved surface of reverse frustoconic, and valve seat 2 is provided with axial hole 11.During sparger work, axial hole 12 air inlets of buting iron 7, coil 5 energisings; Produce electromagnetic attraction, armature 3 overcomes spring force and moves upward, and makes between the upper-end surface of lower end surface and valve seat 2 of armature 3 and produces a slit; Blast tube is opened; Gas passes through from the slit, from axial hole 11 ejections of valve seat 2, realizes air feed again.When sparger is not worked, coil 5 outages, armature 3 makes its lower end surface be close to the upper-end surface of valve seat 2 under the effect of spring force, closes blast tube, stops air feed.There is following defective in compressed natural gas injector of the prior art: because armature is cylindrical, in the work, whole gas channel is in the dry environment; Serious wear between the outer surface of armature and the internal surface of case of sprayer causes armature shorter working life, and the easy blocking blast tube; Make the compressed natural gas injector air feed unstable; Need frequent change armature and compressed natural gas injector, not only time-consuming, and also user cost is high.

Summary of the invention

The object of the present invention is to provide the compressed natural gas injector that a kind of air feed is stable and working life is long.

For realizing above-mentioned purpose, the present invention adopts following technological scheme:

A kind of compressed natural gas injector, it comprises: case of sprayer, valve seat, armature, spring, coil, coil case, buting iron and electric connector; Case of sprayer and buting iron are inserted in the hole of coil, and coil case is enclosed within outside the coil, close up coil case, coil, buting iron and case of sprayer are connected as one in roller limit, coil case two ends; Valve seat, armature and spring are located in the endoporus of case of sprayer from bottom to top successively, and valve seat and case of sprayer bolt, spring head on the upper end of armature and the lower end of buting iron; Buting iron is provided with axial hole, and valve seat is provided with axial hole, it is characterized in that,

Armature is that to be four jiaos be the square of transition arc to cross section; Each transition arc is positioned on the same circle; Armature is provided with opening axial blind hole up, the center line of axial blind hole and the central lines of armature, and the bottom of axial blind hole is positioned at the upper end of armature; The upper end of armature is provided with four sidewise holes of the direction of below outwardly that is connected with axial blind hole; The center line of four sidewise holes evenly distributes on the same conical surface on the center line of summit at axial blind hole, and two side planes that are parallel to each other of said armature are vertically divided on the plane at the center line place of two relative sidewise holes equally, and the outlet of sidewise hole is positioned at outside the upper end of armature on the side plane.

The diameter of a circle at the transition arc place of said armature is than little 0. 02mm of the diameter of bore～0.10mm of said case of sprayer, and the angular range of each said filtration circular arc is 2～45 degree.

The surface of case of sprayer and the surface of armature all have nitriding layer.

The upper-end surface sulfuration of valve seat has sheet rubber.

The lower end surface sulfuration of buting iron has urethane film.

The internal surface of case of sprayer and the outer surface of armature are coated with polytetrafluoroethylene floor.

The beneficial effect of technological scheme provided by the invention is:

1, compressed natural gas injector of the present invention; To be four jiaos be the square of transition arc because wherein armature is cross section; Each transition arc is positioned on the same circle; Armature is provided with opening axial blind hole up, the center line of axial blind hole and the central lines of armature, and the bottom of axial blind hole is positioned at the upper end of armature; The upper end of armature is provided with four sidewise holes of the direction of below outwardly that is connected with axial blind hole; The center line of four sidewise holes evenly distributes on the same conical surface on the center line of summit at axial blind hole, and two side planes that are parallel to each other of said armature are vertically divided on the plane at the center line place of two relative sidewise holes equally, and the outlet of sidewise hole is positioned at outside the upper end of armature on the side plane.During use, give vent to anger in the armature upper end, and gas is crossed gas from four side planes of armature; At the outside compression ring that forms of armature; Make armature in case of sprayer inner suspension central authorities and move up and down, air feed is stable, has reduced the friction of armature and case of sprayer endoporus; Increase the working life of armature, further prolonged the working life of compressed natural gas injector.Approximately be 1.5 times of existing technology compressed natural gas injector working life the working life of compressed natural gas injector of the present invention.

2, compressed natural gas injector of the present invention; Wherein the diameter of a circle at the transition arc of armature place is than the little 0.02mm～0.10mm of diameter of bore of case of sprayer 1; The angular range of each transition arc is 2～45 degree, guarantees that better armature is suspended in the endoporus of case of sprayer in the course of the work.

3, compressed natural gas injector of the present invention; Wherein the surface of the surface of case of sprayer and armature all has nitriding layer, the surface of case of sprayer and the surface hardness of armature is strengthened, when armature moves up and down in case of sprayer; Reduce abrasion, increase working life.

4, compressed natural gas injector of the present invention, wherein the sulfuration of the upper-end surface of valve seat has sheet rubber, during coil blackout; Armature is under the effect of elastic force; The armature lower end surface abuts against with the sheet rubber of valve seat upper-end surface, sheet rubber sealing, flexible, good airproof performance, and absorbing.

5, compressed natural gas injector of the present invention, wherein the sulfuration of the lower end surface of buting iron has urethane film, when the generation electromagnetic attraction moves upward armature when coil electricity, because the effect of urethane film absorbs the vibration of armature bump buting iron, plays the effect of absorbing.

6, compressed natural gas injector of the present invention; Wherein the outer surface of the internal surface of case of sprayer and armature is coated with polytetrafluoroethylene floor, when armature moves up and down in case of sprayer, because dry friction coefficient is low between the polytetrafluoroethylene floor; Surface friction drag is little; Armature motion is more flexible, so the response time is short, response is fast.

Description of drawings

Fig. 1 is an existing technology compressed natural gas injector structural representation;

Fig. 2 is a compressed natural gas injector structural representation of the present invention;

Fig. 3 is the armature plan structure schematic representation among the present invention.

Embodiment

For making the object of the invention, technological scheme and advantage clearer, will combine accompanying drawing that embodiment of the present invention is done to describe in detail further below.

Like Fig. 2, shown in Figure 3, compressed natural gas injector of the present invention, it comprises: case of sprayer 1, valve seat 2, armature 3, spring 4, coil 5, coil case 6, buting iron 7 and electric connector 8; Case of sprayer 1 is inserted in the hole of coil 5 with buting iron 7, and coil case 6 is enclosed within outside the coil 5, closes up coil case 6, coil 5, buting iron 7 and case of sprayer 1 four are connected as one in roller limit, coil case 6 two ends; Valve seat 2, armature 3 and spring 4 are located in the endoporus of case of sprayer 1 from bottom to top successively, valve seat 2 and case of sprayer 1 bolt, and spring 4 heads on the upper end of armature 3 and the lower end of buting iron 7; Buting iron 7 is provided with axial hole 12, and valve seat 2 is provided with axial hole 11, it is characterized in that,

Armature 3 is the square of transition arc for cross section is four jiaos; Each transition arc is positioned on the same circle; Armature 3 is provided with opening axial blind hole 9 up; The center line of axial blind hole 9 and the central lines of armature; The bottom of axial blind hole 9 is positioned at the upper end of armature 3, and the center line that the upper end of armature 3 is provided with 10, four sidewise holes 10 of four sidewise holes of the direction of below outwardly that is connected with axial blind hole 9 evenly distributes on the same conical surface on the center line of axial blind hole 9 on the summit; Two side planes that are parallel to each other of said armature are vertically divided on the plane at the center line place of two relative sidewise holes 10 equally, and the outlet of sidewise hole 10 is positioned at the upper end outer side surface of armature 3.

The diameter of a circle at the transition arc place of armature 3 is than the little 0.02mm of diameter of bore or the 0.05mm or the 0.10mm of said case of sprayer 1, and the angular range of each transition arc is 2 degree or 5 degree or 15 degree or 25 degree or 35 degree or 45 degree.

The surface of the surface of case of sprayer 1 and armature 3 all has nitriding layer.

The upper-end surface sulfuration of valve seat 2 has sheet rubber.

The lower end surface sulfuration of buting iron 7 has urethane film.

The outer surface of the internal surface of case of sprayer 1 and armature 3 is coated with polytetrafluoroethylene floor.

During sparger work, axial hole 12 air inlets of buting iron 7, coil 5 energisings; Produce electromagnetic force, armature 3 overcomes spring force and moves upward, and makes and produces a slit between armature 3 and the valve seat 2; The rock gas passage is opened; Gas passes through from the slit between armature and the valve seat, from axial hole 11 ejections of valve seat 2, realizes air feed again.

When sparger is not worked, coil 5 outages, armature 3 abuts against on its underpart valve seat 2 under the effect of spring force, closes blast tube, stops air feed.

The contrast experiment

Get that the existing technology compressed natural gas injector carries out reliability trial described in 6 compressed natural gas injectors of the present invention and 6 background techniquies under the simulated automotive engine condition; 15 ℃～35 ℃ of test ambient temperature; Relative moisture is not more than 85%; Pressure 0.5MPa, medium adopts the dry air of cleaning.

Experimental result: the life-span of 6 compressed natural gas injectors of the present invention is respectively 1295.5 hours, 1308 hours; 1291 hours, 1288 hours, 1286 hours, 1301 hours, the life-span of existing technology compressed natural gas injector was respectively 850 hours, 841 hours, 861 hours, 859 hours, 847 hours, 868 hours described in 6 background techniquies.

The above is merely preferred embodiment of the present invention, and is in order to restriction the present invention, not all within spirit of the present invention and principle, any modification of being done, is equal to replacement, improvement etc., all should be included within protection scope of the present invention.

Claims

1. compressed natural gas injector, it comprises: case of sprayer (1), valve seat (2), armature (3), spring (4), coil (5), coil case (6), buting iron (7) and electric connector (8); Case of sprayer (1) and buting iron (7) are inserted in the hole of coil (5); Coil case (6) is enclosed within outside the coil (5), closes up coil case (6), coil (5), buting iron (7) and case of sprayer (1) four are connected as one in roller limit, coil case (6) two ends; Valve seat (2), armature (3) and spring (4) are located in the endoporus of case of sprayer (1) from bottom to top successively, and valve seat (2) and case of sprayer (1) bolt, spring (4) head on the upper end of armature (3) and the lower end of buting iron (7); Buting iron (7) is provided with axial hole (12), and valve seat (2) is provided with axial hole (11), it is characterized in that,

Armature (3) is the square of transition arc for cross section is four jiaos; Each transition arc is positioned on the same circle; Armature (3) is provided with opening axial blind hole (9) up; The center line of axial blind hole (9) and the central lines of armature; The bottom of axial blind hole (9) is positioned at the upper end of armature (3), and the upper end of armature (3) is provided with four sidewise holes (10) of the direction of below outwardly that is connected with axial blind hole (9), and the center line of four sidewise holes (10) evenly distributes on the same conical surface on the center line of axial blind hole (9) on the summit; Two side planes that are parallel to each other of said armature are vertically divided on the plane at the center line place of relative two sidewise holes (10) equally, and the outlet of sidewise hole (10) is positioned at outside the upper end of armature 3 on the side plane.

2. compressed natural gas injector according to claim 1; It is characterized in that; The diameter of a circle at the transition arc place of said armature (3) is than the little 0.02mm～0.10mm of diameter of bore of said case of sprayer (1), and the angular range of each said transition arc is 2～45 degree.

3. compressed natural gas injector according to claim 1 and 2 is characterized in that, the surface of the surface of case of sprayer (1) and armature (3) all has nitriding layer.

4. compressed natural gas injector according to claim 3 is characterized in that, the upper-end surface sulfuration of valve seat (2) has sheet rubber.

5. compressed natural gas injector according to claim 3 is characterized in that, the lower end surface sulfuration of buting iron (7) has urethane film.

6. compressed natural gas injector according to claim 3 is characterized in that, the outer surface of the internal surface of case of sprayer (1) and armature (3) is coated with polytetrafluoroethylene floor.