CN210599241U

CN210599241U - Direct injection high-pressure pump in cylinder

Info

Publication number: CN210599241U
Application number: CN201921057680.5U
Authority: CN
Inventors: 袁亚飞; 赵典秋; 吴振; 刘新冬; 刘劝; 汤丽
Original assignee: Jiangsu Baton Technology Co ltd
Current assignee: Jiangsu Baton Technology Co ltd
Priority date: 2019-07-08
Filing date: 2019-07-08
Publication date: 2020-05-22
Anticipated expiration: 2029-07-08

Abstract

The utility model relates to a direct injection high-pressure pump in cylinder, which comprises a pump body, be equipped with the oil inlet on the pump body, the oil-out, be equipped with pressure-stabilizing cavity in the pump body, the low pressure chamber, the high pressure chamber, first connection oil duct, the oil duct is connected to the second, the oil inlet switches on through pressure-stabilizing cavity and first connection oil duct, first connection oil duct is through the low pressure chamber in proper order, the oil duct switches on with the second connection oil duct, the second is connected the oil duct and is switched on with the oil-out, the low pressure intracavity is equipped with the solenoid valve, the high pressure intracavity is equipped with plunger device, oil-out department is equipped with the relief valve, the relief chamber switches on with low pressure chamber or high pressure chamber, the relief valve is including establishing the seal receptacle of through-hole, the double-screw bolt and locating the pearl body between seal receptacle and the double-screw bolt. The utility model discloses change the relief valve structure into spherical seal from plane seal, it is sealed effectual, sealed form is more stable, and closes the effect sooner, has improved the fuel feeding efficiency of high-pressure pump.

Description

Direct injection high-pressure pump in cylinder

Technical Field

The utility model belongs to the technical field of automobile engine, concretely relates to direct injection high-pressure pump in cylinder.

Background

The existing direct injection high-pressure oil injection pump comprises a pump body, wherein an oil inlet and an oil outlet are arranged on the pump body, a pressure stabilizing cavity, a first connecting oil duct and a second connecting oil duct are arranged in the pump body, the oil inlet and the first connecting oil duct are communicated with the pressure stabilizing cavity, the second connecting oil duct is communicated with the oil outlet, a diaphragm assembly is arranged in the pressure stabilizing cavity, the direct injection high-pressure oil injection pump also comprises an electromagnetic valve for controlling the first connecting oil duct and the second connecting oil duct to be communicated or disconnected, a plunger device for pressing oil in the second connecting oil duct into the oil outlet when the electromagnetic valve is closed is further arranged on the pump body, the electromagnetic valve comprises a coil winding, a valve seat, a valve rod, a valve core, a sealing sheet and a reset spring for resetting the valve rod, a fixed iron core is arranged in the coil winding, the sealing sheet is sleeved at the lower end of the valve, valve core and valve rod linkage cooperation, the definite iron core is located the valve core upper end, is equipped with the inlet port that switches on with first connecting oil way on the disk seat, is connected the oil outlet that the oil duct switched on with the second, is equipped with the connecting hole between inlet port, the oil outlet, the gasket is located the below of connecting hole, the connecting hole inner wall on be equipped with and be used for forming sealed plane with the gasket, during the circular telegram, the definite iron core produces the appeal and upwards stimulates the valve core to drive valve rod, gasket upward movement, when gasket and sealed plane are sealed, the solenoid valve is closed, during the outage, under reset spring effect, resets the valve rod.

The utility model with the publication number of CN 205936935U specifically discloses an engine fuel injection pump, which comprises a pump body, an oil inlet and an oil outlet arranged on the pump body, a solenoid valve, a plunger device, a coil winding, a valve seat, a valve plug, a valve rod, a valve core, a valve body and a first reset spring, wherein the valve plug comprises a sealing end and a guiding end, the cross section of the whole structure is T-shaped, the guiding end of the valve plug is arranged in the guiding hole and can be matched in a sliding way, the tail end of the guiding end is contacted with the front end of the valve rod, the valve body is provided with a first oil outlet, the first oil outlet is circumferentially provided with a first conical surface, the sealing end is circumferentially provided with a second conical surface matched with the first conical surface, the two conical surfaces form an inclined surface matching, the T-shaped valve plug is adopted, the guiding function of guiding is realized by arranging the guiding end and the guiding hole in the valve body, thereby ensuring, meanwhile, due to the design of the inclined plane matching, the fuel oil is more stable during conveying, a certain guiding effect can be achieved, and the combustion efficiency of the fuel oil is improved. However, the structure of the pressure relief valve of the patent still needs to be further improved to improve the sealing effect.

Disclosure of Invention

The utility model aims to solve the technical problem that overcome prior art not enough, provide a direct injection high-pressure pump of jar, change the relief valve structure into spherical seal from plane seal, it is sealed effectual, sealed form is more stable, and closes the effect faster, has improved the fuel feeding efficiency of high-pressure pump.

For solving the above technical problem, the utility model discloses a technical scheme who takes is:

a direct injection high-pressure pump comprises a pump body, wherein an oil inlet and an oil outlet are arranged on the pump body, a pressure stabilizing cavity, a low-pressure cavity, a high-pressure cavity, a first connecting oil duct and a second connecting oil duct are arranged in the pump body, the oil inlet is communicated with the top of the pressure stabilizing cavity, the first connecting oil duct is communicated with the bottom of the pressure stabilizing cavity, the first connecting oil duct is communicated with the second connecting oil duct through the low-pressure cavity and the high-pressure cavity in sequence, the second connecting oil duct is communicated with the oil outlet, a diaphragm assembly is arranged in the pressure stabilizing cavity, an electromagnetic valve for controlling the first connecting oil duct and the second connecting oil duct to be communicated and disconnected is arranged in the low-pressure cavity, a plunger device for pressing oil in the second connecting oil duct into the oil outlet when the electromagnetic valve is closed is arranged in the high-pressure cavity, a pressure relief valve arranged in the pressure relief cavity is arranged at the oil outlet, the pressure relief cavity is communicated with the, the bead body and the sealing seat can be in sealing connection, the bead body is in linkage fit with the stud, and a pressure release valve spring is arranged between the stud and the inner wall of the pressure release cavity.

Preferably, the pressure relief chamber is in communication with the low pressure chamber.

Preferably, the stud comprises a head portion and a tail portion, the cross section of the integral structure is T-shaped, the head portion is connected with the bead body in a sealing mode, the tail portion is inserted into the pressure relief valve spring, and the length of the tail portion is larger than 3/4 of the length of the pressure relief valve spring and smaller than the length of the pressure relief valve spring. More preferably the length of the tail is 4/5 the length of the relief valve spring.

Preferably, the solenoid valve includes coil winding, the valve body, the disk seat, the lid seat, the valve plug, the valve rod, the case and be used for the first reset spring that resets the valve rod, the front end of disk seat is located to the lid seat, the rear end of disk seat is located to the valve body, be equipped with the fixed iron core in the coil winding, the front end of valve rod passes behind the disk seat and contacts with the valve plug, valve plug and valve rod linkage cooperation, the case cover is established at the valve rod end, case and valve rod linkage cooperation, the fixed iron core is located the case end, first reset spring sets up between fixed iron core and case.

Further preferably, the valve plug includes sealed end and guide end, overall structure's cross-section is the T type, the front end contact of sealed end and valve rod, be equipped with second reset spring between guide end and the lid seat, lid seat circumference is equipped with a plurality of oil outlets that switch on with the second connection oil duct, be equipped with the first inlet port that switches on with first connection oil duct on the disk seat, the first oil outlet that switches on with the oil outlet of lid seat, first inlet port, be equipped with the connecting hole between the first oil outlet, the sealed end and the first oil outlet looks adaptation of valve plug.

Preferably, the tail end of the valve core is inwards sunken to form a spring fixing seat, and the first return spring is arranged in the spring fixing seat.

Preferably, a positioning ring is arranged on the valve seat and sleeved on the valve rod.

Preferably, the plunger device comprises a plunger and a third return spring for returning the plunger, one end of the plunger extends into the high-pressure cavity, the other end of the plunger extends out of the pump body, a spring pad is arranged at one end of the plunger extending out of the pump body, a spring seat is arranged on the pump body, the third return spring is sleeved on the plunger, and two ends of the third return spring are respectively abutted against the spring seat and the spring pad.

Preferably, an oil outlet valve is arranged at the outlet of the second connecting oil duct, the oil outlet valve comprises an oil outlet valve seat and an oil outlet valve seat cover, a ball body is arranged in the oil outlet valve seat, a fourth reset spring is arranged between the ball body and the oil outlet valve seat cover, and the ball body is pressed on an oil inlet hole of the oil outlet valve seat through the fourth reset spring.

Preferably, the diaphragm assembly comprises an upper pressure seat, a lower pressure seat and a diaphragm body, and the diaphragm body is arranged between the upper pressure seat and the lower pressure seat in a pressing mode.

Due to the adoption of the technical scheme, compared with the prior art, the utility model have the following advantage:

1. the utility model discloses the relief valve structure is changed into spherical seal from planar seal, and is sealed effectual, has reduced the bearing area, requires to reduce to the rigidity of relief valve spring, has increased the reliability of relief valve, and the afterbody length extension of double-screw bolt simultaneously opens the ball valve constantly and opens more stably and close rapidly, is favorable to the installation again, and the pressure oscillation influence to the production of internal liquid way is minimum, has improved the fuel feeding efficiency of high-pressure pump.

2. The outlet position of the pressure release valve of the utility model is changed from the original 90-degree flow angle to 180 degrees, and is changed from the conduction with the high pressure cavity to the conduction with the low pressure cavity, thereby being beneficial to the flow of fluid, reducing the fluctuation of the pressure in the high pressure cavity and the disturbance of the fluid, being more beneficial to the stability of the outlet pressure of the high pressure pump, being beneficial to the stability of the pressure difference before and after the oil inlet of the electromagnetic valve, and improving the accuracy of the oil inlet;

3. the integral design of the utility model reduces the volume of the high-pressure cavity in a reasonable range, and improves the volumetric efficiency of the high-pressure pump, thereby enhancing the stability of the outlet pressure of the high-pressure pump and improving the oil supply efficiency of the high-pressure pump;

4. the oil inlet valve structure of the utility model can accelerate the opening response, increase the oil inlet quantity and reduce the oil return quantity for the closing response, and integrally improve the oil supply efficiency of the high-pressure pump;

5. the oil outlet valve structure of the utility model adopts spherical sealing, has good sealing effect, small interference to the flow of fluid, quick closing response and reduced return loss, thereby improving the oil supply efficiency of the high-pressure pump;

6. the utility model discloses brand-new high-pressure pump structural design has strengthened the sealed effect of each sealed face, has reduced manufacturing cost, has simplified assembly process, has improved the stability of high-pressure pump outlet pressure, has improved the fuel feeding efficiency of high-pressure pump, more is favorable to the realization of localization, promotes the development of the internal independent direct high-pressure pump technique of spouting of petrol jar.

Drawings

Fig. 1 is a schematic structural view of the present invention;

FIG. 2 is a cross-sectional view of FIG. 1;

FIG. 3 is a schematic view of a portion of the solenoid valve;

FIG. 4 is a schematic structural diagram of a pressure relief valve;

FIG. 5 is a schematic view showing the construction of the delivery valve;

wherein: 1. a pump body; 2. an electromagnetic valve; 21. a coil winding; 22. a valve body; 23. a valve seat; 24. a cover seat; 25. a valve plug; 251. sealing the end; 252. a guide end; 26. a valve stem; 27. a valve core; 28. a first return spring; 29. a second return spring; 3. a plunger device; 31. a plunger; 32. a third return spring; 33. a spring pad; 34. a spring seat; 35. a bushing; 36. a sealing retainer ring; 37. a bidirectional sealing ring; 4. a voltage stabilizing cavity; 5. a low pressure chamber; 6. a high pressure chamber; 7. a first connecting oil passage; 8. a second connecting oil passage; 9. a diaphragm assembly; 91. an upper pressing seat; 92. pressing down the base; 93. a diaphragm body; 10. an oil inlet nozzle; 11. filtering with a screen; 12. an oil outlet valve; 121. an oil outlet valve seat; 122. an oil outlet valve seat cover; 123. a sphere; 124. a fourth return spring; 13. a pressure relief valve; 131. a sealing seat; 132. a stud; 132a, a head; 132b, a tail; 133. a bead body; 134. a relief valve spring; 14. a housing; 15. fixing an iron core; 16. connecting sleeves; 17. and (6) positioning rings.

Detailed Description

The present invention will be further described with reference to the accompanying drawings and examples.

As shown in the attached drawings 1 to 5, the utility model relates to a direct injection high-pressure pump, including the pump body 1, be equipped with oil inlet, oil-out on the pump body 1. An oil inlet nozzle 10 is arranged at the oil inlet, and a filter screen 11 is arranged in the oil inlet nozzle 10 for preventing impurities from entering the engine.

The pump body 1 is internally provided with a pressure stabilizing cavity 4, a low pressure cavity 5, a high pressure cavity 6, a first connecting oil channel 7 and a second connecting oil channel 8, a diaphragm assembly 9 is arranged in the pressure stabilizing cavity 4, an oil inlet is communicated with the top of the pressure stabilizing cavity 4, an inlet of the first connecting oil channel 7 is communicated with the bottom of the pressure stabilizing cavity 4, an outlet of the first connecting oil channel 7 sequentially passes through the low pressure cavity 5 and the high pressure cavity 6 and is communicated with an inlet of the second connecting oil channel 8, an outlet of the second connecting oil channel 8 is communicated with an oil outlet, the low pressure cavity 5 is internally provided with an electromagnetic valve 2 for controlling the first connecting oil channel 7 and the second connecting oil channel 8 to be communicated or disconnected, and the high pressure cavity 6 is internally provided with a plunger device 3 for pressing oil in the second connecting oil channel 8 into the oil.

The diaphragm assembly 9 includes an upper pressure seat 91, a lower pressure seat 92, and a diaphragm body 93, wherein the diaphragm body 93 is pressed between the upper pressure seat 91 and the lower pressure seat 92.

The solenoid valve 2 includes a housing 14, a coil winding 21, a valve body 22, a valve seat 23, a cover seat 24, a valve plug 25, a valve stem 26, a valve spool 27, and a first return spring 28 for returning the valve stem 26. The cover seat 24 is provided at the front end of the valve seat 23, the valve body 22 is provided at the rear end of the valve seat 23, and the housing 14 is provided at the rear end of the valve body 22. A coil winding 21 is provided in the case 14, and a fixed iron core 15 is provided in the coil winding 21. A connecting sleeve 16 is arranged between the coil winding 21 and the fixed iron core 15, the connecting sleeve 16 is connected with the rear end of the valve body 22, so that a cavity is formed between the connecting sleeve 16 and the valve body 22, the fixed iron core 15 and the valve core 27 are arranged in the cavity, and the valve core 27 can slide in the cavity. The front end of the valve stem 26 passes through the valve seat 23 and contacts the valve plug 25, and the valve plug 25 is in interlocking engagement with the valve stem 26. The valve core 27 is sleeved at the tail end of the valve rod 26, and the valve core 27 is in linkage fit with the valve rod 26. The stationary core 15 is located at the end of the valve spool 27, and a first return spring 28 for returning the valve stem 26, which is moved by the attraction of the coil winding 21, to the initial position is provided between the stationary core 15 and the valve spool 27.

The valve plug 25 includes sealed end 251 and guide end 252, overall structure's cross-section is the T type, the front end contact of sealed end 251 and valve rod 26, be equipped with second reset spring 29 between guide end 252 and the lid seat 24, lid seat 24 circumference is equipped with a plurality of oil outlets that switch on with the second connection oil duct 8, be equipped with the first inlet port that switches on with first connection oil duct 7 on the disk seat 23, the first oil outlet that switches on with the oil outlet of lid seat 24, first inlet port, be equipped with the connecting hole between the first oil outlet, the sealed end 251 and the first oil outlet looks adaptation of valve plug 25. The end of the spool 27 is recessed inwardly to form a spring seat in which a first return spring 28 is seated. The valve seat 23 is provided with a positioning ring 17, and the positioning ring 17 is sleeved on the valve rod 26.

Plunger device 3 includes plunger 31 and is used for the third reset spring 32 that resets plunger 31, and the one end of plunger 31 extends to high-pressure chamber 6 in, and the other end extends to outside the pump body 1, and the one end that plunger 31 extends to outside the pump body 1 is equipped with spring pad 33, is equipped with spring holder 34 on the pump body 1, and third reset spring 32 cover is established on plunger 31, and the both ends of third reset spring 32 respectively with spring holder 34 and spring pad 33 conflict. The plunger device 3 is connected with the pump body 1 through threads, and is convenient to disassemble and fix. A bush 35 is arranged in the high-pressure cavity 6, and the plunger 31 is sleeved in the bush 35 and can slide along the axial direction of the bush 35. In order to ensure the sealing property between the plunger device 3 and the pump body 1, a seal retainer 36 is provided between the spring seat 34 and the pump body 1, and a two-way seal 37 is provided between the spring seat 34 and the plunger 31.

An outlet of the second connecting oil passage 8 is provided with an oil outlet valve 12, the oil outlet valve 12 includes an oil outlet valve seat 121 and an oil outlet valve seat cover 122, a ball 123 is arranged in the oil outlet valve seat 121, a fourth return spring 124 is arranged between the ball 123 and the oil outlet valve seat cover 122, and the ball 123 is pressed on an oil inlet of the oil outlet valve seat 121 through the fourth return spring 124. The spheres 123 are ceramic spheres. The cross-section of oil outlet valve seat lid 122 is the T type, including circumference open the disc that has the oil outlet and set up and be used for carrying out circumference spacing support column at the disc center to spheroid 123, the support column link up and is equipped with the oil outlet, fourth reset spring 124 sets up in the outside of support column, support column and spheroid 123's cooperation department set up the circular cone recess, and this circular cone recess and spheroid 123 looks adaptation.

The oil outlet is provided with a pressure release valve 13 arranged in the pressure release cavity, the pressure release cavity 13 is communicated with the low pressure cavity 5 or the high pressure cavity 6, in the embodiment, the pressure release cavity is communicated with the low pressure cavity 5, and the central axes of the pressure release cavity and the low pressure cavity 5 are parallel. The relief valve 13 includes a sealing seat 131 with a through hole therein, a stud 132, and a bead 133 disposed between the sealing seat 131 and the stud 132. The bead body 133 is a steel ball, the bead body 133 and the sealing seat 131 can be connected in a sealing mode, the bead body 133 and the stud 132 are in linkage fit and can move in the pressure relief cavity, and a pressure relief valve spring 134 used for resetting the stud 132 is arranged between the stud 132 and the inner wall of the pressure relief cavity. Stud 132 includes head 132a and afterbody 132b, and the cross-section of overall structure is T type, and head 132a and the sealed connection of pearl body 133, afterbody 132b insert in relief valve spring 134, and the length of afterbody 132b is 4/5 of relief valve spring 134 length. The fitting part of the sealing seat 131 and the bead body 133 is provided with a conical groove, and the conical groove is matched with the bead body 133.

The above description of the present invention is provided to help understand the method and the core idea of the present invention, and the purpose of the present invention is to allow people familiar with the art to understand the contents of the present invention and to implement the method, and thus the protection scope of the present invention cannot be limited by the above description. All equivalent changes and modifications made according to the spirit of the present invention should be covered by the protection scope of the present invention.

Claims

1. The utility model provides a direct injection high-pressure pump in cylinder, includes the pump body, be equipped with oil inlet, oil-out on the pump body, be equipped with pressure-stabilizing cavity, low-pressure chamber, high-pressure chamber, first connection oil duct, second connection oil duct in the pump body, the oil inlet switches on with the top of pressure-stabilizing cavity, and first connection oil duct switches on with the bottom of pressure-stabilizing cavity, and first connection oil duct switches on through low-pressure chamber, high-pressure chamber and second connection oil duct in proper order, and the second is connected the oil duct and is switched on with the oil-out, be equipped with the diaphragm subassembly in the pressure-stabilizing cavity, the low pressure intracavity is equipped with and is used for controlling first connection oil duct and second connection oil duct and lead to, disconnected solenoid valve, the high pressure intracavity is equipped with the plunger device that is used for the oil of: the oil outlet department is equipped with the relief valve of locating the pressure release intracavity, the pressure release chamber switches on with low-pressure chamber or high-pressure chamber, the relief valve establishes seal receptacle, the double-screw bolt of through-hole and locates the pearl body between seal receptacle and the double-screw bolt in including, the pearl body with the seal receptacle can sealing connection, the pearl body with the double-screw bolt linkage cooperation, be equipped with the relief valve spring between the inner wall in double-screw bolt and pressure release chamber.

2. The in-cylinder direct injection high-pressure pump according to claim 1, characterized in that: the pressure relief cavity is communicated with the low pressure cavity.

3. The in-cylinder direct injection high-pressure pump according to claim 1, characterized in that: the double-screw bolt includes head and afterbody, and overall structure's cross-section is the T type, the head with ball body sealing connection, the afterbody is inserted and is established in the relief valve spring, the length of afterbody is greater than 3/4 and is less than relief valve spring length of relief valve spring length.

4. The in-cylinder direct injection high-pressure pump according to claim 1, characterized in that: the solenoid valve includes coil winding, valve body, disk seat, lid seat, valve plug, valve rod, case and is used for the first reset spring of reset valve rod, the front end of disk seat is located to the lid seat, the rear end of disk seat is located to the valve body, be equipped with the fixed iron core in the coil winding, the front end of valve rod passes behind the disk seat and contacts with the valve plug, valve plug and valve rod linkage cooperation, the case cover is established at the valve rod end, case and valve rod linkage cooperation, the fixed iron core is located the case end, first reset spring sets up between fixed iron core and case.

5. The in-cylinder direct injection high-pressure pump according to claim 4, characterized in that: the valve plug includes sealed end and guide end, and overall structure's cross-section is the T type, sealed end with the front end contact of valve rod, be equipped with second reset spring between guide end and the lid seat, lid seat circumference is equipped with a plurality of oil outlets that switch on with the second connection oil duct, be equipped with the first inlet port that switches on with first connection oil duct on the disk seat, the first oil outlet that switches on with the oil outlet of lid seat, be equipped with the connecting hole between first inlet port, the first oil outlet, the sealed end and the first oil outlet looks adaptation of valve plug.

6. The in-cylinder direct injection high-pressure pump according to claim 4, characterized in that: the tail end of the valve core is inwards sunken to form a spring fixing seat, and the first return spring is arranged in the spring fixing seat.

7. The in-cylinder direct injection high-pressure pump according to claim 4, characterized in that: and a positioning ring is arranged on the valve seat and sleeved on the valve rod.

8. The in-cylinder direct injection high-pressure pump according to claim 1, characterized in that: the plunger device includes the plunger and is used for the third reset spring who resets the plunger, the one end of plunger extends to the high-pressure intracavity, and the other end extends to the pump body externally, the plunger extends to the external one end of pump and is equipped with the spring pad, be equipped with the spring holder on the pump body, the third reset spring cover is established on the plunger, the both ends of third reset spring respectively with spring holder and spring pad conflict.

9. The in-cylinder direct injection high-pressure pump according to claim 1, characterized in that: the outlet of second connection oil duct is equipped with out oil valve, it includes oil outlet valve seat, oil outlet valve seat lid to go out oil valve, be equipped with the spheroid in the oil outlet valve seat, be equipped with fourth reset spring between spheroid and the oil outlet valve seat lid, the spheroid is established on the inlet port of oil outlet valve seat through fourth reset spring pressure.

10. The in-cylinder direct injection high-pressure pump according to claim 1, characterized in that: the diaphragm assembly comprises an upper pressing seat, a lower pressing seat and a diaphragm body, wherein the diaphragm body is arranged between the upper pressing seat and the lower pressing seat in a pressing mode.