CN201496188U - Electric control diesel fuel injector driven by electrostriction element - Google Patents
Electric control diesel fuel injector driven by electrostriction element Download PDFInfo
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- CN201496188U CN201496188U CN200920306506XU CN200920306506U CN201496188U CN 201496188 U CN201496188 U CN 201496188U CN 200920306506X U CN200920306506X U CN 200920306506XU CN 200920306506 U CN200920306506 U CN 200920306506U CN 201496188 U CN201496188 U CN 201496188U
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Abstract
The utility model relates to an electric control diesel fuel injector driven by an electrostriction element, wherein a pushing rod, a pre-compression spring, a pushing rod seat, an electrostriction element component and a pre-tightening nut are installed in order in turn along the axial direction on the inner edge of a shell of a fuel injector, wherein a fuel spray nozzle matching part, a matching part gap adjusting tie plate, a fuel spray nozzle matching part reset sprig, an instruction oil cavity body, an instruction plunger reset spring, a lower instruction oil sealing valve seat tie plate, an instruction plunger, a lower instruction oil sealing valve seat, an instruction plunger matching part body and an upper instruction oil sealing valve seat are installed in turn along the axial direction on the inner edge of a nut sleeve, components are installed into a rear oil spraying device shell and are screwed with the nut sleeve, each component end surface is closely connected to form sealing and to compose a mechanism of fuel spray nozzle needle valve axial direction movement controlled by tiny axial direction flex of the electrostriction element under the high voltage diesel state. The electric control diesel fuel injector driven by the electrostriction element can realize precise high frequency high voltage diesel oil spraying under the drive of the electrostriction element only through a set of instruction plunger control matching part, thereby lowering the cost and manufacture precision of diesel engine electric control fuel injectors.
Description
[technical field]
The utility model relates to the oil sprayer that a kind of electric-control diesel engine fuel injection system uses, and particularly uses a kind of electric-controlled diesel oil fuel oil injector that is driven by electrostriction element of joint-track type electronic fuel injection technology.
[background technique]
At present, the diesel oil supply system of common rail electric-controlling diesel engine adopts electromagnetic injector that high-pressure diesel is sprayed into cylinder, because induction reactance is to a certain degree arranged during the work of the electromagnetic coil of electromagnetic fuel injector, be difficult to respond the requirement of higher injection frequency, more cleaning, more low noise direction develop to lower oil consumption, discharging to have limited diesel engine.
[model utility content]
The utility model purpose is to provide a kind of electric-controlled diesel oil fuel oil injector of electrostriction element driving, this oil sprayer can make diesel engine realize that in very of short duration injection time pre-for several times spray adds the oil spout of main jet, noise, oil consumption, the discharging of diesel engine, every technical order of output power are improved, to solve the problems referred to above that existing electromagnetic injector exists.
The technological scheme that solves its problems referred to above employing is: the electric-controlled diesel oil fuel oil injector that a kind of electrostriction element drives, comprise the nozzle holder that has oil inlet passage and drainback passage, nut sleeve, be installed in nozzle holder and the axially movable mechanism of nut sleeve inner control injector valve, the axially movable mechanism of described control injector valve a kind ofly produces small axial stretching by electrostriction element, on instruction chamber control injector valve, the pressure difference of following both ends of the surface, thereby the axially movable axially movable mechanism of injector valve of control injector valve by the small axial stretching control of electrostriction element, push rod is installed in nozzle holder vertically successively in proper order, preloading spring, ram seat, electrostriction element assembly and pre-load nut, injector nozzle matching parts is installed in nut sleeve vertically successively in proper order, pad is adjusted in idol part gap, the injector nozzle matching parts return spring, the instruction oil cavity, the instruction plunger return spring, oil seal valve seat pad gives an order, the instruction plunger, the oil seal valve seat gives an order, instruction plunger coupled parts body and last instruction oil seal valve seat, the lower end surface of nozzle holder, last instruction oil seal valve seat, instruction plunger coupled parts body, give an order the oil seal valve seat and the instruction oil cavity two end faces, the upper-end surface of injector nozzle matching parts all is high planeness planes, each part end face closely connects, form sealing, constituted the axially movable mechanism of injector valve that under the high-pressure diesel state, controls by the small axial stretching of electrostriction element.
Owing to adopt technique scheme, the utlity model has following beneficial effect:
One, the high-pressure diesel that can realize more accurate, higher frequency sprays, and makes multi-injection be more prone to realize, thereby noise, oil consumption, the discharging of diesel engine, every technical order of output power are improved.
The utility model adopts electrostriction element as driving element, under the high-pressure diesel state, pass through the axial displacement of the small extending amount control command of driving element plunger, reach the accurate purpose of spraying of weak electric signal control high-pressure diesel of the control system that uses a computer, because the process that electrostriction element powers up elongation, go electricity to recover nature normality size can not be subjected to external interference, can respond the requirement of higher injection frequency, thereby can realize that high-pressure diesel more accurate, higher frequency sprays.
Two, scientific structure, simple, reliable, processing and fabricating is convenient, and cost is low.
The axially movable mechanism of control injector valve of the present utility model a kind ofly produces small axial stretching by electrostriction element, on instruction chamber control injector valve, the pressure difference of following both ends of the surface, thereby the axially movable mechanism of control injector valve, " push rod is installed vertically successively in proper order; preloading spring; ram seat; electrostriction element assembly and pre-load nut in nozzle holder; injector nozzle matching parts is installed in proper order successively vertically in nut sleeve; pad is adjusted in even part gap by adopting, the injector nozzle matching parts return spring, the instruction oil cavity, the instruction plunger return spring, pad, the instruction plunger, the oil seal valve seat gives an order, instruction plunger coupled parts body and last instruction oil seal valve seat, the lower end surface of nozzle holder, last instruction oil seal valve seat, instruction plunger coupled parts body, give an order the oil seal valve seat and the instruction oil cavity both ends of the surface, the upper-end surface of injector nozzle matching parts all is high planeness planes, each part end face closely connects, form sealing, constituted the axially movable mechanism of injector valve that under the high-pressure diesel state, controls by the small axial stretching of electrostriction element." compare with the electric-controlled diesel oil fuel oil injector that the existing electrostriction element of the utility model people drives; its structure is simpler; only with the even part of instruction plunger one cover control; under the driving of electrostriction element; just can realize that accurate high frequency high-pressure diesel sprays, and has reduced the cost and the manufacture difficulty of diesel oil automatical control system critical component electric-controlled fuel injector.
Below, the technical characteristics of the electric-controlled diesel oil fuel oil injector that a kind of electrostriction element of the utility model is driven is described further in conjunction with the accompanying drawings.
[description of drawings]
Fig. 1-1～Fig. 1-5: the electric-controlled diesel oil fuel oil injector structural representation that a kind of electrostriction element of the utility model drives:
The right elevation of Fig. 1-1: Fig. 1-2, Fig. 1-2: plan view,
Fig. 1-3: by the structural representation (the A-A sectional view of Fig. 1-2) of the axially movable mechanism of injector valve of the small axial stretching of electrostriction element control;
Fig. 1-4: by the oil channel structures signal of the axially movable mechanism of injector valve of the small axial stretching of electrostriction element control, and the operating principle schematic representation (the A-A sectional view of Fig. 1-2) in instruction chamber;
The B portion partial enlarged drawing of Fig. 1-5: Fig. 1-4;
Fig. 2: instruction piston structure schematic representation (sectional view);
Fig. 3: instruction oil cavity structural representation (sectional view);
Fig. 4: oil seal valve seat construction schematic representation (sectional view) gives an order;
Fig. 5: instruction plunger coupled parts body structure schematic representation (sectional view);
Fig. 6: on instruct oil seal valve seat construction schematic representation (sectional view);
Fig. 7-1～Fig. 7-3: nozzle holder structural representation:
Fig. 7-1: plan view, the B-B sectional view of Fig. 7-2: Fig. 7-1, the plan view of Fig. 7-3: Fig. 7-1.
Structural representation (part) when Fig. 8-1 instruction plunger and last instruction oil seal valve seat and the seal form between the oil seal valve seat of giving an order are plane sealing:
Fig. 8-2: sealing surface is the structural representation of the instruction plunger on plane.
Among the figure:
1, the 2-injector nozzle matching parts, the 3-nut sleeve, pad is adjusted in 4-injector nozzle matching parts gap, 5-injector nozzle matching parts return spring, 6-instructs plunger return spring, the 7-oil seal valve seat pad that gives an order, 8-instructs plunger, the 9-nozzle holder, 10-connector headstock, the 11-power outlet, the 12-pre-load nut, 13-plastics spacer, the 14-electrostriction element, the 15-ram seat, 16-electrostriction element preloading spring, the last instruction of 17-oil seal valve seat, 18-instruction plunger coupled parts body, the 19-oil seal valve seat that gives an order, 20-instructs oil cavity, the 21-push rod, 22-oil nozzle spout, 23-injector nozzle matching parts sealing surface, 24-oil nozzle oil inlet passage, 25-injector nozzle matching parts high-voltage oil cavity, 26-injector nozzle matching parts oil inlet hole, 27-instruction oil cavity high pressure oilhole, the 28-oil seal valve seat high pressure oilhole that gives an order, the 29-oil seal valve seat oil-feed tank that gives an order, 30-instruction plunger coupled parts height is pressed oilhole, the last instruction of 31-oil seal valve seat high pressure oilhole, the face that is sealed and matched of the 32-instruction plunger and the oil seal valve seat that gives an order, the cavity that 33-gives an order oil seal valve seat and instruction plunger and instructs the plunger coupled parts body to form, 34-nozzle holder high pressure oil inlet hole, 35-nozzle holder high-pressure oil passage, 36-instruction oil cavity center hole system, the 37-oil seal valve seat pressure release oil groove that gives an order, the 38-oil seal valve seat pressure release oilhole that gives an order, 39-instruction plunger coupled parts body pressure release oilhole, the last instruction of 40-oil seal valve seat pressure release oil groove I, the cavity that 41-last instruction oil seal valve seat and instruction plunger and instruction plunger coupled parts body form, the face that is sealed and matched of 42-instruction plunger and last instruction oil seal valve seat, the last instruction of 43-oil seal valve seat pressure release oil groove II, 44,45-nozzle holder drainback passage, 46-nozzle holder low pressure spill port.
All the other labels are seen described in the literary composition.
[embodiment]
The electric-controlled diesel oil fuel oil injector that a kind of electrostriction element drives comprises the nozzle holder, the nut sleeve that have oil inlet passage and drainback passage, is installed in nozzle holder and the axially movable mechanism of nut sleeve inner control injector valve; The axially movable mechanism of described control injector valve a kind ofly produces small axial stretching by electrostriction element, by the pressure difference of instruction chamber control injector valve upper/lower terminal face, thus the axially movable mechanism of control injector valve;
Push rod 21 is installed in nozzle holder 9 vertically successively in proper order, preloading spring 16, ram seat 15, electrostriction element 14 and be coated on the electrostriction element assembly that the plastics spacer 13 on the electrostriction element 14 is formed, carry out pretension with pre-load nut 12 then, injector nozzle matching parts 1 is installed in nut sleeve 3 vertically successively in proper order, 2, pad 4 is adjusted in idol part gap, injector nozzle matching parts return spring 5, instruction oil cavity 20, instruction plunger return spring 6, oil seal valve seat pad 7 gives an order, instruction plunger 8, oil seal valve seat 19 gives an order, instruction plunger coupled parts body 18, last instruction oil seal valve seat 17, the lower end surface of nozzle holder, last instruction oil seal valve seat, instruction plunger coupled parts body, give an order the oil seal valve seat and the instruction oil cavity both ends of the surface, the upper-end surface of injector nozzle matching parts all is high planeness planes, each part end face closely is connected to form sealing, has constituted the axially movable mechanism of injector valve (referring to Fig. 1-3) that is controlled by the small axial stretching of electrostriction element under the high-pressure diesel state.
Described instruction plunger 8 is shaft-like parts, comprise that the upper ejector pin section 81 that fuses, middle even part cooperate section 82 and lower push rod section 83, middle even part cooperates section 82 and upper ejector pin section 81 conical surface transition to form sealing surface 821, and middle even part cooperates section 82 and lower push rod section 83 conical surface transition to form lower sealing surface 822; The even part in centre of instruction plunger 8 cooperates section 82 and instruction plunger coupled parts body center holes 181 to form even part fitted seal, and instruction plunger 8 can be moved freely in instruction plunger coupled parts body 18 vertically; Sealing surface 821 forms the face 42 that is sealed and matched with last instruction oil seal sealing surface of seat 172 on the instruction plunger, instruction plunger lower sealing surface 822 forms the face 32 that is sealed and matched with the oil seal sealing surface of seat 192 that gives an order, and its seal form is ball face sealing or conical surface seal (referring to Fig. 2, Fig. 4, Fig. 5, Fig. 6).
As shown in Figure 3, described instruction oil cavity 20 is shaft-like parts, and its center hole 201 is level Four shoulder holes, and conical surface transition, aperture, third level hole minimum are arranged in the middle of its first order hole, lower end surface and the hole, the second level; The parallel axes of instruction oil cavity high pressure oilhole 27 and instruction oil cavities 20, and along instructing the oil cavity axial direction to extend and running through instruction oil cavity 20.
As shown in Figure 4, the described oil seal valve seat 19 that gives an order is shaft-like parts, the oil seal valve base center hole 191 that gives an order is secondary shoulder holes, up big and down small, if adopt the conical surface or ball face sealing then in the middle of two shoulder holes conical surface transition to be arranged, then can there be this conical surface transition (referring to Fig. 8-1) as adopting plane sealing; Give an order oil seal valve seat pressure release oilhole 38 and the oil seal valve seat high pressure oilhole 28 that gives an order on the oil seal valve seat 19 of giving an order be distributed in give an order oil seal valve seat axis both sides and with the oil seal valve seat parallel axes that gives an order, and extend and run through the oil seal valve seat 19 that gives an order along the oil seal valve seat axial direction that gives an order; Oil seal valve seat 19 both ends of the surface that give an order respectively have a groove, the oil seal valve seat oil-feed tank 29 that gives an order that wherein is positioned at upper-end surface oil seal valve base center hole 191 tops that will give an order are communicated with the oil seal valve seat high pressure oilhole 28 that gives an order, and the oil seal valve seat pressure release oil groove 37 that gives an order that is positioned at lower end surface oil seal valve base center hole 191 bottoms that will give an order are communicated with the oil seal valve seat pressure release oilhole 38 that gives an order.
As shown in Figure 5, described instruction plunger coupled parts body 18 is shaft-like parts, even part cooperates section 82 to form even part precision-fit in the middle of the instruction plunger coupled parts body center hole 181 and instruction plungers 8, instruction plunger coupled parts height on the instruction plunger coupled parts body 18 press oilhole 30 and instruction plunger coupled parts body pressure release oilhole 39 to be distributed in instruction plunger coupled parts body axis both sides and and instruction plunger coupled parts body axis parallel, and extend and run through along instruction plunger coupled parts body axis direction and instruct plunger coupled parts body 18.
As shown in Figure 6, described upward instruction oil seal valve seat 17 is shaft-like parts, instruction oil seal valve base center hole 171 is secondary shoulder holes on it, up-small and down-big, as adopt the conical surface or ball face sealing then in the middle of two shoulder holes conical surface transition to be arranged, then can there be this conical surface transition (referring to Fig. 8-1) as adopting plane sealing; Go up instruction oil seal valve seat high pressure oilhole 31 and last instruction oil seal valve seat parallel axes on the last instruction oil seal valve seat 17, and extend and run through along last instruction oil seal valve seat axial direction and instruct oil seal valve seat 17; Last instruction oil seal valve seat 17 both ends of the surface respectively have a groove to be distributed in the offside of instruction oil seal valve seat high pressure oilhole 31, wherein be positioned at instruction oil seal valve seat pressure release oil groove II (43) is through to instruction oil seal valve seat 17 from last instruction oil seal valve seat 17 center holes the external cylindrical surface of going up of upper-end surface, what be positioned at the lower end surface goes up the instruction plunger coupled parts body pressure release oilhole 39 corresponding positions of instruction oil seal valve seat pressure release oil groove I (40) on from last instruction oil seal valve base center hole 171 to and instruction plunger coupled parts body 18, and and instruction plunger coupled parts body pressure release oilhole 39 is connected.
Shown in Fig. 7-1～Fig. 7-3, described nozzle holder 9 is waney cylindrical bodys, top is big, the bottom is little, its center has runs through cylindrical 4 grades of shoulder holes, the shoulder hole aperture reduces from top to bottom successively, nozzle holder central stepped 91 tops are for being used to install ram seat 15, the macropore of electrostriction element assembly and pre-load nut 12, the little stomidium of nozzle holder shoulder hole 91 is the aperture that is used to install push rod, the both sides of the little stomidium of nozzle holder central stepped 91 have high pressure oil inlet hole parallel with the center line shoulder hole 34 and low pressure spill port 46 respectively, cylindrical body upper end band internal thread, lower end band outside thread, there is a square through hole perpendicular to cylinder axis front side, cylindrical body top, respectively there is a up big and down small boss both sides before and after the middle part, wherein there is a high-pressure oil passage 35 that is communicated with high pressure oil inlet hole 34 at front end boss center, and there is a drainback passage 45 that is communicated with low pressure spill port 46 at boss center, rear end, 44.
The electrostriction element assembly of the electric-controlled diesel oil fuel oil injector that the utility model electrostriction element drives is formed by electrostriction element 14 and at the plastics spacer 13 of electrostriction element 14 outsides; Electrostriction element is that piezo ceramic element or other get electric flexible electrostriction element; Described electrostriction element preloading spring 16 is made of video disc spring or helical spring.
The oil inlet passage of the electric-controlled diesel oil fuel oil injector that the utility model electrostriction element drives by nozzle holder high-pressure oil passage 35, nozzle holder high pressure oil inlet hole 34, on instruct oil seal valve seat high pressure oilhole 31, instruction plunger coupled parts height to press oilhole 30, the oil seal valve seat high pressure oilhole 28 that gives an order, instruction oil cavity high pressure oilhole 27 and injector nozzle matching parts oil inlet hole 26 to form;
Drainback passage is by nozzle holder drainback passage 44,45, nozzle holder low pressure spill port 46, on instruct oil seal valve seat pressure release oil groove II (43) to form.
Shown in Fig. 1-3, Fig. 1-4, constitute the utility model by the instruction chamber of the axially movable mechanism of injector valve of the small axial stretching control of electrostriction element by instruction oil cavity 20, instruction plunger return spring 6, the oil seal valve gasket 7 that gives an order, instruction plunger 8, the oil seal valve seat 19 that gives an order, instruction plunger coupled parts body 18 with go up the even part of two-way valve body that instruction oil seal valve seat 17 is formed;
When instruction plunger 8 and last instruction oil seal valve seat 17 the instruction plunger with on when instructing the face that the is sealed and matched 42 places formation face seal of oil seal valve seat to cooperate, the upward instruction oil seal valve seat high pressure oilhole 31 of high pressure oil through being interconnected, instruction plunger coupled parts height is pressed oilhole 30, the oil seal valve seat high pressure oilhole 29 and the oil seal valve seat oil-feed tank 28 that gives an order give an order, the cavity 33 that gives an order oil seal valve seat and instruction plunger and instruct the plunger coupled parts body to form, the instruction oil cavity center holes in the middle of the little gap and instruction oil cavity 20 of the face that is sealed and matched 32 formation of the process instruction plunger and the oil seal valve seat that gives an order are 36 formation UNICOMs again;
When instruction plunger 8 and be sealed and matched face 32 places of oil seal valve seat 19 at instruction plunger and the oil seal valve seat that gives an order that give an order form when being sealed and matched, instruction oil cavity center holes in the middle of the instruction oil cavity 20 be 36 by give an order oil seal valve seat pressure release oil groove 37 with give an order oil seal valve seat pressure release oilhole 38, instruction plunger coupled parts body pressure release oilhole 39 and last instruction oil seal valve seat pressure release oil groove I (40), the little gap of the face that is sealed and matched 42 formation of process instruction plunger and last instruction oil seal valve seat again, last instruction oil seal valve seat pressure release oil groove II (43) and nozzle holder low pressure spill port 46 and nozzle holder drainback passage 45,44 communicate (referring to Fig. 1-4).
A kind of conversion as the utility model embodiment, the face that is sealed and matched 42 that sealing surface 821 and last instruction oil seal sealing surface of seat 172 form on the described instruction plunger, instruction plunger lower sealing surface 822 forms the face that is sealed and matched with the oil seal sealing surface of seat 192 that gives an order, its seal form also can be a plane sealing, its face of being sealed and matched is respectively 42a, 32a (referring to Fig. 8-1), in such cases, the even part in centre of instruction plunger cooperate section 82 respectively with lower push rod section 83, upper ejector pin section 81 adopts the plane transition to form sealing surface 821a on the instruction plunger, instruction plunger lower sealing surface 822a (referring to Fig. 8-2); Described go up the instruction oil seal valve base center hole 171 and the oil seal valve base center hole 191 that gives an order the secondary shoulder hole do not need conical surface transition (referring to Fig. 8-1).
Working procedure is as follows:
After connecting high-pressure diesel, high-pressure diesel enters by nozzle holder high pressure oil inlet hole 34 from nozzle holder high-pressure oil passage 35, last instruction oil seal valve seat high pressure oilhole 31, instruction plunger coupled parts height is pressed oilhole 30, oil seal valve seat high pressure oilhole 28 gives an order, the oil inlet passage that instruction oil cavity high pressure oilhole 27 and injector nozzle matching parts oil inlet hole 26 are formed, one tunnel injector nozzle matching parts high-voltage oil cavity 25 and the injector nozzle matching parts sealing surface 23 that arrives injector nozzle matching parts housing 1 middle part wherein, another road enters the cavity 33 of give an order oil seal valve seat and instruction plunger and the formation of instruction plunger coupled parts body through the oil seal valve seat oil-feed tank 28 that gives an order, because electrostriction element 14 is in no electric excitation state, electrostriction element keeps nature prestressing state length, under the acting in conjunction of instruction plunger return spring 6 and high-pressure diesel, sealing surface 821 is in tight contact condition formation sealing with last instruction oil seal sealing surface of seat 172 on the instruction plunger, the cavity 33 interior high-pressure diesels that give an order oil seal valve seat and instruction plunger and instruct the plunger coupled parts body to form can't be by the gap of instruction plunger lower sealing surface 822 with oil seal sealing surface of seat 192 formation that give an order, oil seal valve seat pressure release oil groove 37 gives an order, instruction plunger coupled parts body pressure release oilhole 39, last instruction oil seal valve seat pressure release oil groove I (40) and the cavity 41 of going up instruction oil seal valve seat and instruction plunger and instructing the plunger coupled parts body to form arrive goes up instruction oil seal valve seat pressure release oil groove II (43), it is 36 that the gap that the sealing surface 192 of high-pressure diesel by instruction plunger lower sealing surface 822 and the oil seal valve seat 19 that gives an order in the cavity 33 that oil seal valve seat and instruction plunger and instruction plunger coupled parts body form of giving an order forms arrives instruction oil cavity center hole, keep the pressure identical with oil inlet passage, because the sectional area of the sectional area ratio needle valve of fuel spray nozzle coupling part 2 of even part gap adjustment pad 4 is big, under the acting in conjunction of injector nozzle matching parts return spring 5, produce the downward axial pressure of needle valve of fuel spray nozzle coupling part 2, force injector valve 2 descending taking a seat, oil sprayer is in not oil spout state.
When electrostriction element 14 is in the electric excitation state, the electrostriction element axial elongation, to instruct plunger 8 to depress by push rod 21, instruction plunger lower sealing surface 822 is in tight contact condition with the oil seal sealing surface of seat 192 that gives an order and forms sealing, instruct simultaneously that sealing surface 821 forms gaps with last instruction oil seal sealing surface of seat 172 on the plunger, it be 36 that the high-pressure diesels in the cavity 33 that give an order oil seal valve seat and instruction plunger and instruction plunger coupled parts body form can't arrive instruction oil cavity center hole by the sealing that the instruction plunger lower sealing surface 822 and the oil seal sealing surface of seat 192 that gives an order form; Simultaneously, low pressure diesel oil through instruction oil cavity center hole be 36 with give an order oil seal valve seat pressure release oil groove 37, instruction plunger coupled parts body pressure release oilhole 39, last instruction oil seal valve seat pressure release oil groove I 40, the cavity 41 that last instruction oil seal valve seat and instruction plunger and instruction plunger coupled parts body form, last instruction oil seal valve seat pressure release oil groove II (43) intercommunicating pore system, form gap and last instruction oil seal valve seat pressure release oil groove II (43) and nozzle holder low pressure spill port 46 and nozzle holder drainback passage 45 by sealing surface 821 on the instruction plunger and last instruction oil seal sealing surface of seat 172,44 communicate, and instruction oil cavity center hole is that 36 pressure descends rapidly.And injector nozzle matching parts high-voltage oil cavity 25 still keeps the pressure identical with nozzle holder high-pressure oil passage 35, needle valve of fuel spray nozzle coupling part 2 is by high-pressure diesel jack-up, high-pressure diesel from arriving oil nozzle spout 22 between injector valve 2 and the injector nozzle matching parts sealing surface 23, is realized oil spout through oil nozzle oil inlet passage 24.
When electrostriction element 14 loses the electric excitation state, electrostriction element axially recovers the prestressing state, instruction plunger 8 is taken a seat under the effect of high-pressure diesel pressure and spring force, clearance channel on the instruction plunger between sealing surface 821 and the last instruction oil seal sealing surface of seat 172 is closed, instruction oil cavity center hole is that 36 pressure rises rapidly, because even part gap is adjusted the cross section product moment of pad 4 and needle valve of fuel spray nozzle coupling part 2 and is formed downward axial force, under 5 actings in conjunction of injector nozzle matching parts return spring, produce the downward axial pressure of needle valve of fuel spray nozzle coupling part 2, force injector valve 2 descending taking a seat, oil spout stops.
Claims (9)
1. the electric-controlled diesel oil fuel oil injector that drives of an electrostriction element, comprise the nozzle holder that has oil inlet passage and drainback passage, nut sleeve, be installed in nozzle holder and the axially movable mechanism of nut sleeve inner control injector valve, it is characterized in that: the axially movable mechanism of described control injector valve a kind ofly produces small axial stretching by electrostriction element, on instruction chamber control injector valve, the pressure difference of following both ends of the surface, thereby the axially movable axially movable mechanism of injector valve of control injector valve by the small axial stretching control of electrostriction element, push rod (21) is installed in nozzle holder (9) vertically successively in proper order, preloading spring (16), ram seat (15), electrostriction element assembly (13,14) and pre-load nut (12), injector nozzle matching parts (1 is installed in nut sleeve (3) vertically successively in proper order, 2), pad (4) is adjusted in idol part gap, injector nozzle matching parts return spring (5), instruction oil cavity (20), instruction plunger return spring (6), oil seal valve seat pad (7) gives an order, instruction plunger (8), oil seal valve seat (19) gives an order, instruction plunger coupled parts body (18) and last instruction oil seal valve seat (17), the lower end surface of nozzle holder, last instruction oil seal valve seat, instruction plunger coupled parts body, give an order the oil seal valve seat and the instruction oil cavity two end faces, the upper-end surface of injector nozzle matching parts all is high planeness planes, each part end face closely connects, form sealing, be formed in the axially movable mechanism of injector valve that controls by the small axial stretching of electrostriction element under the high-pressure diesel state.
2. the electric-controlled diesel oil fuel oil injector that a kind of electrostriction element according to claim 1 drives, it is characterized in that: described instruction plunger (8) is a shaft-like part, comprise that the upper ejector pin section (81) that fuses, middle even part cooperate section (82) and lower push rod section (83), middle even part cooperates section (82) and upper ejector pin section (81) plane or conical surface transition to form sealing surface, and middle even part cooperates section (82) and lower push rod section (83) plane or conical surface transition to form lower sealing surface; The even part in the centre of instruction plunger (8) cooperates section (82) and instruction plunger coupled parts body center hole (181) to form even part fitted seal, and instruction plunger (8) can be moved freely in instruction plunger coupled parts body (18) vertically; Sealing surface (821) forms the face (42) that is sealed and matched with last instruction oil seal sealing surface of seat (172) on the instruction plunger, instruction plunger lower sealing surface (822) forms the face (32) that is sealed and matched with the oil seal sealing surface of seat (192) that gives an order, and its seal form is plane sealing, ball face sealing or conical surface seal.
3. the electric-controlled diesel oil fuel oil injector that a kind of electrostriction element according to claim 2 drives, it is characterized in that: described instruction oil cavity (20) is a shaft-like part, its instruction oil cavity center hole (201) is a level Four shoulder hole, conical surface transition, aperture, third level hole minimum are arranged in the middle of its first order hole, lower end surface and the hole, the second level; Instruction oil cavity high pressure oilhole (27) and instruction oil cavity parallel axes, and along instructing the oil cavity axial direction to extend and running through instruction oil cavity (20).
4. the electric-controlled diesel oil fuel oil injector that a kind of electrostriction element according to claim 3 drives, it is characterized in that: the described oil seal valve seat (19) that gives an order is a shaft-like part, its oil seal valve base center hole (191) that gives an order is a secondary shoulder hole, up big and down small, give an order oil seal valve seat pressure release oilhole (38) and the oil seal valve seat high pressure oilhole (28) that gives an order on the oil seal valve seat (19) of giving an order be distributed in give an order oil seal valve seat axis both sides and with the oil seal valve seat parallel axes that gives an order, and extend and run through the oil seal valve seat (19) that gives an order along the oil seal valve seat axial direction that gives an order; Oil seal valve seat (19) both ends of the surface that give an order respectively have a groove, the oil seal valve seat oil-feed tank (29) that gives an order that wherein is positioned at upper-end surface oil seal valve base center hole (191) top that will give an order is communicated with the oil seal valve seat high pressure oilhole (28) that gives an order, and the oil seal valve seat pressure release oil groove (37) that gives an order that is positioned at lower end surface oil seal valve base center hole (191) bottom that will give an order is communicated with the oil seal valve seat pressure release oilhole (38) that gives an order.
5. the electric-controlled diesel oil fuel oil injector that a kind of electrostriction element according to claim 4 drives, it is characterized in that: described instruction plunger coupled parts body (18) is a shaft-like part, even part cooperates section (82) to form even part precision-fit in the middle of the instruction plunger coupled parts body center hole 181 and instruction plungers (8), instruction plunger coupled parts height in instruction plunger coupled parts body (18) press oilhole (30) and instruction plunger coupled parts body pressure release oilhole (39) to be distributed in instruction plunger coupled parts body axis both sides and and instruction plunger coupled parts body axis parallel, and extend and run through instruction plunger coupled parts body (18) along instruction plunger coupled parts body axis axial direction.
6. the electric-controlled diesel oil fuel oil injector that a kind of electrostriction element according to claim 5 drives, it is characterized in that: described upward instruction oil seal valve seat (17) is a shaft-like part, instruction oil seal valve base center hole (171) is a secondary shoulder hole on it, up-small and down-big, go up instruction oil seal valve seat high pressure oilhole (31) and last instruction oil seal valve seat parallel axes on the last instruction oil seal valve seat (17), and extend and run through along last instruction oil seal valve seat axial direction and instruct oil seal valve seat (17); Last instruction oil seal valve seat (17) both ends of the surface respectively have a groove to be distributed in the offside of instruction oil seal valve seat high pressure oilhole (31), wherein be positioned at instruction oil seal valve seat pressure release oil groove II (43) is through to instruction oil seal valve seat (17) from last instruction oil seal valve base center hole (171) the external cylindrical surface of going up of upper-end surface, what be positioned at the lower end surface goes up instruction plunger coupled parts body pressure release oilhole (39) the corresponding position of instruction oil seal valve seat pressure release oil groove I (40) on from last instruction oil seal valve base center hole (171) to and instruction plunger coupled parts body (18), and and instruction plunger coupled parts body pressure release oilhole (39) is connected.
7. the electric-controlled diesel oil fuel oil injector that a kind of electrostriction element according to claim 6 drives is characterized in that: described instruction chamber by instruction oil cavity (20), instruction plunger return spring (6), the oil seal valve gasket (7) that gives an order, instruction plunger (8), the oil seal valve seat (19) that gives an order, instruction plunger coupled parts body (18), on instruct oil seal valve seat (17) to form the even part of two-way valve body;
When instruction plunger (8) and last instruction oil seal valve seat (17) the instruction plunger with on when instructing the sealing surface (42) of oil seal valve seat to locate to form face seal to cooperate, the upward instruction oil seal valve seat high pressure oilhole (31) of high pressure oil through being interconnected, instruction plunger coupled parts height is pressed oilhole (30), the oil seal valve seat high pressure oilhole (29) and the oil seal valve seat oil-feed tank (28) that gives an order give an order, the cavity (33) that gives an order oil seal valve seat and instruction plunger and instruct the plunger coupled parts body to form is again through instructing the plunger and the little gap and instruction oil cavity center hole system (36) of the face that is sealed and matched (32) formation of the oil seal valve seat that gives an order to form UNICOM;
When the instruction plunger (8) and the oil seal valve seat (19) that gives an order are located to form when being sealed and matched at instruction plunger and the face that is sealed and matched (32) of oil seal valve seat of giving an order, instruction oil cavity center hole system (36) in the middle of the instruction oil cavity (20) is by the oil seal valve seat pressure release oil groove (37) and the oil seal valve seat pressure release oilhole (38) that gives an order of giving an order, instruction plunger coupled parts body pressure release oilhole (39) and last instruction oil seal valve seat pressure release oil groove I (40), the little gap of the face that is sealed and matched (42) formation of process instruction plunger and last instruction oil seal valve seat again, last instruction oil seal valve seat pressure release oil groove II (43) communicates with nozzle holder low pressure spill port and nozzle holder drainback passage.
8. the electric-controlled diesel oil fuel oil injector that a kind of electrostriction element according to claim 7 drives, it is characterized in that: when the seal form that forms the face (42) that is sealed and matched when sealing surface (821) and last instruction oil seal sealing surface of seat (172) on the instruction plunger was ball face sealing or conical surface seal, two shoulder holes of instruction oil seal valve base center hole (171) are middle it on a conical surface transition.
9. the electric-controlled diesel oil fuel oil injector that a kind of electrostriction element according to claim 7 drives, it is characterized in that: when the seal form of instructing the plunger lower sealing surface (822) and the oil seal sealing surface of seat (192) that gives an order to form the face (32) that is sealed and matched is ball face sealing or conical surface seal, conical surface transition is arranged in the middle of two shoulder holes of its oil seal valve base center hole (191) that gives an order.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN200920306506XU CN201496188U (en) | 2009-07-20 | 2009-07-20 | Electric control diesel fuel injector driven by electrostriction element |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN200920306506XU CN201496188U (en) | 2009-07-20 | 2009-07-20 | Electric control diesel fuel injector driven by electrostriction element |
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| Publication Number | Publication Date |
|---|---|
| CN201496188U true CN201496188U (en) | 2010-06-02 |
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| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN200920306506XU Expired - Fee Related CN201496188U (en) | 2009-07-20 | 2009-07-20 | Electric control diesel fuel injector driven by electrostriction element |
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| Country | Link |
|---|---|
| CN (1) | CN201496188U (en) |
Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN101956635B (en) * | 2009-07-20 | 2013-01-16 | 柳州华威电控技术有限公司 | Electronically controlled diesel injector driven by electrostriction element |
| CN103603756A (en) * | 2013-12-10 | 2014-02-26 | 广西壮族自治区汽车拖拉机研究所 | Electromagnetically driven non-backpressure electronic diesel injector |
| CN103644058A (en) * | 2013-12-17 | 2014-03-19 | 中国北方发动机研究所(天津) | Oil inlet and return orifice of common rail oil sprayer and control cavity structure |
-
2009
- 2009-07-20 CN CN200920306506XU patent/CN201496188U/en not_active Expired - Fee Related
Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN101956635B (en) * | 2009-07-20 | 2013-01-16 | 柳州华威电控技术有限公司 | Electronically controlled diesel injector driven by electrostriction element |
| CN103603756A (en) * | 2013-12-10 | 2014-02-26 | 广西壮族自治区汽车拖拉机研究所 | Electromagnetically driven non-backpressure electronic diesel injector |
| CN103644058A (en) * | 2013-12-17 | 2014-03-19 | 中国北方发动机研究所(天津) | Oil inlet and return orifice of common rail oil sprayer and control cavity structure |
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| GR01 | Patent grant | ||
| C17 | Cessation of patent right | ||
| CF01 | Termination of patent right due to non-payment of annual fee |
Granted publication date: 20100602 Termination date: 20110720 |