CN2861525Y

CN2861525Y - Dimethyl ether engine fuel injector

Info

Publication number: CN2861525Y
Application number: CN 200520097108
Authority: CN
Inventors: 杨启梁; 张光德; 谢剑刚; 熊文
Original assignee: Wuhan University of Science and Engineering WUSE
Current assignee: Wuhan University of Science and Engineering WUSE
Priority date: 2005-07-08
Filing date: 2005-07-08
Publication date: 2007-01-24
Anticipated expiration: 2015-07-08

Abstract

The utility model relates to a fuel injection device for dimethyl ether engine, which consists of an injector base [8], a nozzle [2] and an one-way valve. The high-pressure oil channel [12] of the injector base [8] is connected with the high-pressure oil chamber [6] of the one-way valve, the high-pressure oil chamber [6] is provided with the spring [15], whose center line is equipped with the one-way valve body [5], whose right terminal is provided with the spring base [14] and the lock [13], and whose left terminal is provided with the cone [18] and the one-way valve [5] at the right of the cone [18] is covered with the guide sleeve [16], which is arranged at the one-way valve base [4]. The diversion channel [17] is provided between the high-pressure oil chamber [6] and the cone [18], whose left terminal is provided with the fuel injection cavity [3], which is connected with the outlet hole [20], whose left terminal is provided with the fuel injection hole [1]. The structure of the utility model is simple and it is easy to implement the utility model with low cost and long service life, and without fuel leakage or adding lubricant, thereby possessing good social and economic benefits.

Description

A kind of dimethyl ether engine oil sprayer

One, technical field

The utility model belongs to the dimethyl ether engine technical field.Relate in particular to a kind of fueling injection equipment of dimethyl ether engine.

Two, background technique

Because dimethyl ether has the characteristics of boiling point low (24.9 ℃), vapor tension height (normal temperature is down for about 0.5MPa) and viscosity very low (kinetic viscosity is a diesel oil about 1/10), to directly it be sprayed in the cylinder, need liquefy and handle and take other a series of special measures.For example, for the greasy property of improving fuel, the wearing and tearing that slow down fuel injector needle valve coupling in the oil supply system, the normal at present method of adding oiling agent that adopts.But, so not only can increase user cost, and oiling agent can not burn fully, also can cause new pollution.

In prior art, the dimethyl ether engine oil supply system mainly contains the pump one pipe one mouth fuel injection system of high pressure common rail fuel injection system and conventional diesel engine.

Common rail fuel injection system is with reference to existing LPG fuel supply system design.(the Ken Friis Hansen of this system, LeoNielsen, John Bogild Hansen and et al.Demonstration of Dimethyl Ether Fuelled City Bus.SAETransactions 2000-01-2005) form by dimethyl ether fuel jar and supplier, fuel injection system, low pressure collection and purification device, high-pressure service pump, compression pump and solenoid valve etc.By high-pressure service pump dimethyl ether is forced into and squeezes into high pressure rail about 30.0MPa, again by electromagnetic valve with the fuel in the track by oil sprayer to the engine air inner cylinder direct injection.For the dimethyl ether in the fuel pot is in a liquid state, be equipped with in the fuel pot to bathe and soak the formula compression pump, a jar internal pressure is remained on more than the dimethyl ether saturation vapour pressure.In purifying collecting tank, dimethyl ether is rendered as gaseous state, need establish a compression pump again gaseous dimethyl is pressed in the fuel pot again.This compression pump can not be driven by motor, so as under the engine shutdown state compression pump endure.This fuel injection system still need be added oiling agent in fuel, improve the greasy property of dimethyl ether.

The structure of diesel engine with direct injection oil-fired system and technical parameter such as injection advance angle, injection starting pressure suitable transformation and adjustment have been carried out respectively, so that be fit to use dimethyl ether fuel.Improved fuel system (Rasmus Christensen, S.C.Sorenson, Michael G.Jensen and et al.Engine Operation on Dimethyl Ether in a Naturally Aspirated, DIDiesel Engine.SAE Transactions 971665), low-pressure section is complete sealed, increased a compression pump, the leakage of fuel is directly guided in the fuel pot by return tube in the oil sprayer.Result of study shows, though can realize very low NO during the engine for combusting dimethyl ether _xWith almost nil carbon smoke exhaust, if but in fuel, do not add oiling agent, oil supply system only can normally be moved about 500 hours.After surpassing, the wearing and tearing of fuel injector needle valve coupling can cause the fuel leak amount significantly to increase.

Three, summary of the invention

The purpose of this utility model provides a kind of simple in structure, long service life, fuel does not have leakage, need not add the fueling injection equipment of the dimethyl ether engine of oiling agent.

For achieving the above object, the technological scheme that the utility model adopted is: this oil sprayer is made up of oil injector seat, oil nozzle and one-way valve.The high-pressure oil passage of oil injector seat communicates with the high-voltage oil cavity of one-way valve, spring is housed in the high-voltage oil cavity, the centerline of spring is equipped with check valve body, spring seat and snap close are equipped with in the right part of check valve body, the left end of check valve body is the conical surface, be with guide sleeve on the check valve body on conical surface right side, guide sleeve is installed in the unidirectional valve seat.Be provided with guide channel between the high-voltage oil cavity and the conical surface.The left end of the conical surface is provided with fuel injection chamber, and fuel injection chamber communicates with oil outlet, and the left end of oil outlet is provided with nozzle opening, and nozzle opening [1] is 1～10.

Wherein, one-way valve is made up of unidirectional valve seat, check valve body, guide sleeve, spring and spring seat and snap close; In the high-voltage oil cavity that unidirectional valve seat is provided with, spring is housed, the check valve body that is with guide sleeve is passed the left side that is installed in unidirectional valve seat from spring center, the right-hand member of check valve body is equipped with spring seat and snap close, the left side wall that an end is contained on the spring seat, the other end is close to high-voltage oil cavity of spring.

The cone shape hole that the conical surface of check valve body matches with unidirectional valve seat is a conical surface seal.

Guide channel between the described high-voltage oil cavity and the conical surface is 1～8, the position of guide channel and shape or flute profile passage or the through hole for offering on the unidirectional valve seat for offering on the guide sleeve inner round wall, or the spiral groove channel for offering on the check valve body.Owing to adopt technique scheme, the cone shape hole that the conical surface of check valve body of the present utility model matches with unidirectional valve seat forms conical surface seal, thereby under the effect of spring, can closely cooperate, the high pressure dimethyl ether is sealed in the high-voltage oil cavity, with the formed pressure of the sealing means of one-way valve, realize the function that oil sprayer high-pressure injection and low pressure are closed.Compare with other oil sprayers, the utility model has been cancelled precision-fit idol part, and no oil returning tube had both solved the kinematic pair wear problem that is brought by the low viscosity of dimethyl ether, solved the leakage problem of dimethyl ether fuel again, than the better effects if that in fuel, adds lubricant oil.

Therefore, the utility model is simple in structure, cost is low, easy enforcement, long service life, fuel do not have leakage, need not add oiling agent, can make minimum discharge dimethyl ether substitute fuel be used smoothly and promote, and has good society and economic benefit.

Four, description of drawings

Fig. 1 is a structural representation of the present utility model;

Fig. 2 is the local enlarged diagram that Fig. 1 sealing cone [18] is located.

Five, embodiment

Below in conjunction with accompanying drawing the utility model is further described.

A kind of oil sprayer of dimethyl ether engine is made up of by spiral marking connection oil injector seat [8], unidirectional valve seat [4] and oil nozzle [2] as shown in Figure 1 and Figure 2.Between oil injector seat [8] and unidirectional valve seat [4], use respectively between unidirectional valve seat [4] and oil nozzle [2] such as soft metals such as copper, aluminium and make seal washer [7], [19] sealing, leak to prevent dimethyl ether.

This oil sprayer is fixed on the dimethyl ether engine by fixed hole [9], closely be connected with high-pressure oil pipe on the dimethyl ether engine by sealing surface [10] and screw thread [11], high-pressure oil pipe communicates with the high-pressure oil passage [12] of oil injector seat [8], the high-voltage oil cavity [6] of one-way valve.Spring [15] is housed in the high-voltage oil cavity [6], and the centerline of spring [15] is equipped with check valve body [5].The right-hand member of check valve body [5] is equipped with snap close [13] and spring seat [14], and wherein the thickness of snap close [13] can change, and comes the size of Regulation spring [15] active force with this.The left end of check valve body [5] is the conical surface [18], and the check valve body [5] on the conical surface [18] right side is spiral groove channel [17], is with guide sleeve [16] on the spiral groove channel [17], and guide sleeve [16] is installed in the unidirectional valve seat [4].The left end of the conical surface [18] is provided with fuel injection chamber [3], and fuel injection chamber [3] communicates with oil outlet [20], and the left end of oil outlet [20] is provided with 3～5 nozzle openings [1].

The cone shape hole that the described conical surface of present embodiment [18] matches with unidirectional valve seat [4] forms sealing cone, one-way valve [5] is under the pressure of spring [15], the conical surface [18] closely cooperates with the awl cone shape hole of unidirectional valve seat [4], makes dimethyl ether form certain pressure by sealing.

This device utilizes the seal action of the conical surface [18] to solve the leakage problem of dimethyl ether.When the high pressure dimethyl ether that oil inlet hole [12] is come in is assembled in high-voltage oil cavity [6], the pressure of dimethyl ether is during greater than the injection starting pressure of spring [15], the conical surface [18] of check valve body [5] is opened, and dimethyl ether is sprayed onto in the dimethyl ether engine cylinder by nozzle opening [1] through fuel injection chamber [3], oil outlet [20].

Present embodiment has been cancelled the precision-fit idol part of oil sprayer, no oil returning tube, had not only been solved by dimethyl ether and hang down kinematic pair wear problem that viscosity brings, but also solved the leakage problem of dimethyl ether fuel.Have simple in structure, cost is low, easy enforcement, long service life, fuel do not have leakage, need not add oiling agent, can make minimum discharge dimethyl ether substitute fuel be used smoothly and promote, and has good society and economic benefit.

Claims

1, a kind of dimethyl ether engine oil sprayer is characterized in that being made up of oil injector seat [8], oil nozzle [2] and one-way valve; The high-pressure oil passage [12] of oil injector seat [8] communicates with the high-voltage oil cavity [6] of one-way valve, spring [15] is housed in the high-voltage oil cavity [6], the centerline of spring [15] is equipped with check valve body [5], the left end of check valve body [5] is the conical surface [18], be with guide sleeve [16] on the check valve body [5] on the conical surface [18] right side, guide sleeve [16] is installed in the unidirectional valve seat [4]; Be provided with guide channel [17] between the high-voltage oil cavity [6] and the conical surface [18]; The left end of the conical surface [18] is provided with fuel injection chamber [3], and fuel injection chamber [3] communicates with oil outlet [20], and the left end of oil outlet [20] is provided with nozzle opening [1].

2, dimethyl ether engine oil sprayer according to claim 1 is characterized in that described one-way valve is made up of unidirectional valve seat [4], check valve body [5], guide sleeve [16], spring [15] and spring seat [14] and snap close [13]; In the high-voltage oil cavity [6] that unidirectional valve seat [4] is provided with, spring [15] is housed, the check valve body [5] that is with guide sleeve [16] is passed the left side that is installed in unidirectional valve seat [4] from spring [15] center, the right-hand member of check valve body [5] is equipped with spring seat [14] and snap close [13], and an end of spring [15] is contained in the left side wall that spring seat [14] is gone up, the other end is close to high-voltage oil cavity [6].

3, dimethyl ether engine oil sprayer according to claim 1 is characterized in that the cone shape hole that the described conical surface [18] matches with unidirectional valve seat [4] is a conical surface seal.

4, dimethyl ether engine oil sprayer according to claim 1, it is characterized in that the guide channel [17] between the described high-voltage oil cavity [6] and the conical surface [18] is 1～8, the position of guide channel [17] and shape or flute profile passage or through hole, or spiral groove channel for offering on the check valve body [5] for offering on the unidirectional valve seat [4] for offering on guide sleeve [16] inner round wall.

5, dimethyl ether engine oil sprayer according to claim 1 is characterized in that described nozzle opening [1] is 1～10.