CN201141335Y - Two-stage lift range oil ejector for high power diesel engine - Google Patents

Two-stage lift range oil ejector for high power diesel engine Download PDF

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Publication number
CN201141335Y
CN201141335Y CNU2007200157893U CN200720015789U CN201141335Y CN 201141335 Y CN201141335 Y CN 201141335Y CN U2007200157893 U CNU2007200157893 U CN U2007200157893U CN 200720015789 U CN200720015789 U CN 200720015789U CN 201141335 Y CN201141335 Y CN 201141335Y
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CN
China
Prior art keywords
lift
pressure adjusting
adjusting spring
oil
diesel engine
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Expired - Fee Related
Application number
CNU2007200157893U
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Chinese (zh)
Inventor
柳崮
杨磊
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DALIAN LOCOMOTIVE RESEARCH INSTITUTE CHINA NORTHERN LOCOMOTIVE GROUP
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DALIAN LOCOMOTIVE RESEARCH INSTITUTE CHINA NORTHERN LOCOMOTIVE GROUP
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Priority to CNU2007200157893U priority Critical patent/CN201141335Y/en
Application granted granted Critical
Publication of CN201141335Y publication Critical patent/CN201141335Y/en
Anticipated expiration legal-status Critical
Expired - Fee Related legal-status Critical Current

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Abstract

Disclosed is a two level lift stroke oil sprayer for a high power diesel engine; the oil sprayer is provided with an upper and a lower inner cavities which contain a first level pressure adjusting spring and a second level pressure adjusting spring respectively; a lift stroke jib is threaded through the second level pressure adjusting spring from bottom to top; the upper end is inserted into a matching hole of the base of the first level pressure adjusting spring and the lower end is provided with a lug boss; the upper end of a needle valve is inserted into a lug boss matching hole on the lower end of the lift stroke jib; an oil containing groove is arranged in the needle valve body. The oil sprayer has the advantages of reliable operation, simple structure, reducing the vibration of the diesel engine, the noise and the exhaust emission, reducing maintenance and improving the service life. Two pressure adjusting springs are adopted to divide the spraying process into two stages; in the first stage, the open degree of the needle valve is small; the primary oil spraying speed is reduced and the pressure increasing rate of the premixing combustion period of the air cylinder is reduced; in the second stage, the needle valve is opened to the full lift stroke to guarantee the requirement of the circulating oil quantity of the diesel engine. When the diesel engine is in the state of small operating condition, in particular to the idle speed, the requirement of the circulating oil quantity can be fulfilled through a very small lift stroke.

Description

High-power diesel engine two-stage lift oil sprayer
Technical field
The utility model relates to a kind of high-power diesel engine two-stage lift oil sprayer, belongs to the oil sprayer technical field of diesel fuel injection system.
Background technique
Adopt the fuel injection system of mechanical-hydraulic control at present on the high-power diesel engine, the opening and closing of its oil-fuel injector needle-valve are controlled by a pressure adjusting spring.In working process of diesel engine, when the fuel injection system oil pressure surpassed the pressure adjusting spring pretightening force, needle-valve was opened in very short time, and the disposable aperture of needle-valve is bigger, causes the initial stage injection rate bigger.During the operation of the big operating mode of diesel engine, big initial stage injection rate can make the maximum temperature of cylinder pre-mixing combustion phase and the rate of pressure rise higher, makes that the high-power diesel machine vibration is big, discharging is poor; In diesel engine unskilled labourer condition when operation,, it is short and aperture is bigger that needle-valve is opened the duration, easily makes fluctuation of speed aggravation, noise big, influences the diesel engine operation stability.Though electronically controlled fuel injection system can satisfy higher emission standard and optimize diesel engine performance, its complex structure, technical difficulty is big, manufacture cost is high, limits its being extensive use of on high-power diesel engine.And the structure of the oil sprayer of the former mechanical-hydraulic control of appropriate change adopts two pressure adjusting springs.Control the characteristics of motion of needle-valve by two pressure adjusting springs, realize that two-stage opens, reduce diesel vibration, noise and discharging.
Summary of the invention
The purpose of this utility model is: for high-power diesel engine provides a kind of simple in structure, reliable operation, in the different oil spout needle-valve in period of diesel engine work time control system aperture, reduction initial stage injection rate, reduce the maximum temperature and the rate of pressure rise of cylinder pre-mixing combustion phase, improve diesel vibration, noise and discharging.The utility model high-power diesel engine is improved under the prerequisite that does not change former oil sprayer external interface size with two-stage lift oil sprayer, this high-power diesel engine with the structure of two-stage lift oil sprayer is: oil injector body is provided with two inner chambers up and down of same axis, contain first order pressure adjusting spring and second level pressure adjusting spring respectively, top of chamber is provided with pressure regulating screw in going up, and the lower inner cavity bottom end is provided with a seat board; Lift is very passed second level pressure adjusting spring from the bottom to top, and its upper end is inserted in following the matching hole of first order pressure adjusting spring, and its lower end is provided with boss; Can be inserted into along the upper end of the needle-valve that moves up and down in the needle-valve body in the boss matching hole of lift tappet lower end, in needle-valve body, be provided with oil holding slot.First order pressure adjusting spring is installed on the spring seat at two ends, and second level pressure adjusting spring is installed on the spring seat at two ends.The lift tappet can be replaced by lift cushion block and press rods, and the top of press rods is provided with the lower spring cup of first order pressure adjusting spring.Pressure regulating screw is pressed on the first order pressure adjusting spring, and second level pressure adjusting spring is pressed on the pressure regulation pad that is supported by spring seat.
First order lift and full lift can be represented with following formula:
h=(8%-30%)H
In the formula, first order lift h is the distance of upper surface to the distance of the following lower surface of second level pressure adjusting spring or lift cushion block upper surface to the following lower surface of second level pressure adjusting spring of lift tappet boss, and full lift H is the distance of the omoplate face of needle-valve to a seat board lower surface.
Lower inner cavity is equipped with two pressure adjusting springs on the oil injector body, and be provided with separately independently pressure block, make these two pressure adjusting springs constitute the work in combination mode in parallel of arranging up and down, the pressure adjusting spring of these two combinations in parallel can be controlled the characteristics of motion of needle-valve in course of injection.Injection initial stage needle-valve under than the low oil pressure effect overcomes the spring force of first order pressure adjusting spring, and the opening ratio of lift is less.Continuation rising along with oil pressure overcomes making a concerted effort of two-stage pressure-regulating spring at main injection stage needle-valve, is opened into full lift, guarantee enough circulation oil masses, reduction initial stage fuel injection rate can be realized the optimization of fuel injection characteristic " slow earlier back is anxious ", obtains more satisfactory fuel injection characteristic.When diesel engine unskilled labourer condition, only need first order lift h just to satisfy the requirement of this operating mode circulation oil mass, this moment, needle-valve was in lower cracking pressure and less lift, had improved unskilled labourer's condition diesel engine operation stability, reduced the fluctuation of speed and noise; When the big operating mode of diesel engine, less first order lift h has reduced the injection rate at initial stage, makes the maximum temperature of cylinder pre-mixing combustion phase and the rate of pressure rise unlikely too high, thereby satisfies the requirement that reduces discharging and noise.Elastic force turn-offs needle-valve fast along with the increasing degree of lift increases biglyyer when helping the fuel feeding end after first order lift h, has improved the oil sprayer functional reliability.The utility model high-power diesel engine two-stage lift oil sprayer reliable operation, simple in structure, adopt two pressure adjusting springs that the course of injection of oil sprayer is divided into two stages, first order stage needle-valve aperture is less, reduces the initial stage injection rate, reduces the rate of pressure rise of cylinder pre-mixing combustion phase.Second level stage needle-valve is opened into full lift H, guarantees the needs of diesel engine cycle oil mass.When diesel engine particularly during idling, only needs very little lift just can satisfy the requirement of this operating mode circulation oil mass in little operating mode.These will help to reduce vibration, noise and the discharging of diesel engine, reduce maintenance load and expense, improve working life, be suitable for practicality.
Description of drawings
Fig. 1 is the utility model high-power diesel engine two-stage lift fuel injector structure schematic representation.
Fig. 2 is first order lift h and the local structure for amplifying schematic representation of full lift H of Fig. 1.
Fig. 3 is the utility model high-power diesel engine another kind of structural representation of two-stage lift oil sprayer.
Fig. 4 is first order lift h and the local structure for amplifying schematic representation of full lift H of Fig. 3.
Embodiment
Now in conjunction with the accompanying drawings the utility model high-power diesel engine is further specified with two-stage lift oil sprayer: with reference to Fig. 1, Fig. 2, oil injector body (10) is provided with two inner chambers up and down, contain first order pressure adjusting spring (14) and second level pressure adjusting spring (9) respectively, top of chamber is provided with pressure regulating screw (16) in going up, and the lower inner cavity bottom end is provided with a seat board (5); Lift tappet (11) passes second level pressure adjusting spring (9) from the bottom to top, and its upper end is inserted in the matching hole of following (13) of first order pressure adjusting spring, and its lower end is provided with boss (26); Can be inserted in the boss matching hole of lift tappet lower end along the upper end of the needle-valve (3) that moves up and down in the needle-valve body (2), in needle-valve body, be provided with oil holding slot (23).First order pressure adjusting spring (14) is installed on the spring seat (13,15) at two ends, and second level pressure adjusting spring (9) is installed on the spring seat (7,12) at two ends.Pressure regulating screw (16) is pressed on the first order pressure adjusting spring (14), and second level pressure adjusting spring (9) is pressed on the pressure regulation pad (8) that is supported by spring seat (7).
In a work cycle of diesel engine, the pulsation fuel oil that is provided by camshaft and Injection Pump flow through oil injector body oil duct (20), bearing leaf fat road (21), needle-valve body oil inlet hole (22) enter into needle-valve body oil holding slot (23) position.Fuel pressure produces the power of impelling needle-valve (3) to rise at the needle-valve pressure-bearing conical surface (30).When the power of oil pressure generation rise needle-valve (3) surpasses first order pressure adjusting spring (14) pretightening force, needle-valve (3) rise and promotion lift tappet (11) and one-level spring lower seat (13) move to first order pressure adjusting spring (14) compression direction, when boss (26) upper surface of lift tappet (11) lower end touches following (7) lower surface of two-level spring, first order lift h is finished in the temporary transient stop motion of needle-valve (3).If oil pressure further raises, lift tappet (11) promotes two-level spring following (7) and moves to second level pressure adjusting spring (9) compression direction.Needle-valve this moment (3) overcome two-stage pressure-regulating spring (9,14) make a concerted effort it continue to be risen, touch seat board (a 5) lower surface until the omoplate face of needle-valve (3) and reach full lift H.When oil pressure was reduced to less than two-stage pressure-regulating spring (9,14) with joint efforts, needle-valve (3) was taken a seat rapidly under two-stage pressure-regulating spring (9,14) force action, stops to the cylinder of diesel engine oil spout.
The utility model high-power diesel engine another kind structure of two-stage lift oil sprayer, please refer to Fig. 3, Fig. 4, the structure of this oil sprayer and above-mentioned oil sprayer are basic identical, difference is that lift tappet (11) can be replaced by lift cushion block (24) and press rods (25), and the top of press rods (25) is provided with the lower spring cup of first order pressure adjusting spring (14).When the power of oil pressure generation rise needle-valve (3) surpasses first order pressure adjusting spring (14) pretightening force, needle-valve (3) rise and promotion lift cushion block (24) and press rods (25) are moved to first order pressure adjusting spring (14) compression direction, when lift cushion block upper surface touches following (7) lower surface of second level spring, first order lift h is finished in the temporary transient stop motion of needle-valve (3).If oil pressure further raises, lift cushion block (24) promotes following (7) of second level spring and moves to second level pressure adjusting spring (9) compression direction.Needle-valve this moment (3) overcome two-stage pressure-regulating spring (9,14) make a concerted effort it continue to be risen, touch seat board (a 5) lower surface until the omoplate face of needle-valve (3) and reach full lift H.When oil pressure was reduced to less than two-stage pressure-regulating spring (9,14) with joint efforts, needle-valve (3) was taken a seat rapidly under two-stage pressure-regulating spring (9,14) force action, stops to the cylinder of diesel engine oil spout.
First order lift h is the distance of upper surface to the distance of following (7) lower surface of second level pressure adjusting spring or lift cushion block (24) upper surface to following (7) lower surface of second level pressure adjusting spring of lift tappet boss (26), and full lift H is the distance of the omoplate face of needle-valve (3) to seat board (a 5) lower surface.
Before the diesel engine of packing into, its full lift H is controlled by the manufacturing of injector nozzle matching parts (1) the utility model high-power diesel engine with two-stage lift oil sprayer.First order lift h size is controlled lift tappet boss (26) upper surface or lift cushion block (24) the upper surface gap to second level spring lower seat (7) lower surface by measuring apolegamy lift tappet (11) or lift cushion block (24); First order injection pressure of injector extend into the upward inner chamber degree of depth of oil injector body (10) by regulating pressure regulating screw (16); changing first order pressure adjusting spring (14) decrement adjusts; in order to guarantee that pressure regulating screw (16) is not loosening in oil sprayer uses, locking with locking nut (17) and protective cap (18).Second level injection pressure of injector changes second level pressure adjusting spring (9) decrement and adjusts by pressure regulation pad (8) quantity on the plus-minus spring lower seat (7).

Claims (5)

1 one kinds of high-power diesel engine two-stage lift oil sprayers, it is characterized in that: oil injector body (10) is provided with two inner chambers up and down of same axis, contain first order pressure adjusting spring (14) and second level pressure adjusting spring (9) respectively, top of chamber is provided with pressure regulating screw (16) in going up, and the lower inner cavity bottom end is provided with a seat board (5); Lift tappet (11) passes second level pressure adjusting spring (9) from the bottom to top, and its upper end is inserted in the matching hole of following (13) of first order pressure adjusting spring, and its lower end is provided with boss (26); Can be inserted in the boss matching hole of lift tappet lower end along the upper end of the needle-valve (3) that moves up and down in the needle-valve body (2), in needle-valve body, be provided with oil holding slot (23).
2 high-power diesel engines according to claim 1 two-stage lift oil sprayer, it is characterized in that: first order pressure adjusting spring (14) is installed on the spring seat (13,15) at two ends, and second level pressure adjusting spring (9) is installed on the spring seat (7,12) at two ends.
3 high-power diesel engines according to claim 2 two-stage lift oil sprayer, it is characterized in that: lift tappet (11) can be replaced by lift cushion block (24) and press rods (25), and the top of press rods (25) is provided with the lower spring cup of first order pressure adjusting spring (14).
4 according to claim 2 or 3 described high-power diesel engines two-stage lift oil sprayer, it is characterized in that: pressure regulating screw (16) is pressed on the first order pressure adjusting spring (14), and second level pressure adjusting spring (9) is pressed on the pressure regulation pad (8) that is supported by spring seat (7).
5 high-power diesel engines according to claim 4 two-stage lift oil sprayer, it is characterized in that: first order lift and full lift can be represented with following formula:
h=(8%-30%)H
In the formula, first order lift h is the distance of upper surface to the distance of following (7) lower surface of second level pressure adjusting spring or lift cushion block (24) upper surface to following (7) lower surface of second level pressure adjusting spring of lift tappet boss (26), and full lift H is the distance of the omoplate face of needle-valve (3) to seat board (a 5) lower surface.
CNU2007200157893U 2007-11-12 2007-11-12 Two-stage lift range oil ejector for high power diesel engine Expired - Fee Related CN201141335Y (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
CNU2007200157893U CN201141335Y (en) 2007-11-12 2007-11-12 Two-stage lift range oil ejector for high power diesel engine

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
CNU2007200157893U CN201141335Y (en) 2007-11-12 2007-11-12 Two-stage lift range oil ejector for high power diesel engine

Publications (1)

Publication Number Publication Date
CN201141335Y true CN201141335Y (en) 2008-10-29

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Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN104728002A (en) * 2015-03-26 2015-06-24 常州博瑞油泵油嘴有限公司 High pressure common rail oil sprayer without static leakage
CN104747337A (en) * 2015-03-26 2015-07-01 常州博瑞油泵油嘴有限公司 Hydraulic coupler of instant response type common-rail oil injector

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN104728002A (en) * 2015-03-26 2015-06-24 常州博瑞油泵油嘴有限公司 High pressure common rail oil sprayer without static leakage
CN104747337A (en) * 2015-03-26 2015-07-01 常州博瑞油泵油嘴有限公司 Hydraulic coupler of instant response type common-rail oil injector

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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: 20081029

Termination date: 20111112