CN111997788A

CN111997788A - Fuel supply system and semi-automatic choke valve thereof

Info

Publication number: CN111997788A
Application number: CN201910445209.1A
Authority: CN
Inventors: 徐小平; 钱光明; 叶秀峰
Original assignee: Huayi Electromechanical Co ltd
Current assignee: Huayi Electromechanical Co ltd
Priority date: 2019-05-27
Filing date: 2019-05-27
Publication date: 2020-11-27

Abstract

A fuel oil supply system and semi-automatic choke valve thereof, the fuel oil supply system comprises a body, a choke valve and a shifting fork, wherein the choke valve and the shifting fork are arranged on the body; the choke valve rocker arm is arranged on the shaft sleeve, and a limit groove is arranged on the choke valve rocker arm; the shaft body is arranged in the shaft sleeve, the top end of the shaft body is provided with a limiting boss matched with the limiting groove, and the limiting boss is abutted against the limiting groove; the torsion spring is arranged on the shaft body, one end of the torsion spring is clamped on the limiting boss, and the other end of the torsion spring abuts against the limiting groove; the choke valve rocker arm rotates to drive the shaft body to rotate synchronously. The invention can automatically open the choke valve by a certain opening degree when the engine is started, thereby improving the starting stability.

Description

Fuel supply system and semi-automatic choke valve thereof

Technical Field

The invention relates to a fuel supply system, in particular to a fuel supply system capable of automatically opening a choke valve by a certain opening degree when an engine is started and a semi-automatic choke valve thereof.

Background

Referring to fig. 1, fig. 1 is a schematic diagram of a prior art fuel supply system. As shown in fig. 1, the choke shaft 30 installed on the body 10 is a whole, the choke flap 40 is installed on the choke shaft 30, and the shift fork 20 drives the choke shaft 30 to rotate so as to realize full opening and full closing of the choke flap 40. When the choke flap 40 is fully closed, under the condition that the shifting fork is not moved, the choke flap 40 cannot be opened by oneself, the air inlet amount is less, the fuel concentration in the mixing chamber is higher at the moment, and because no more air is diluted, the bad phenomena such as stuffiness and blasting are easy to occur when the engine is started, the starting difficulty and the like occur, and the performance of the engine is influenced.

Disclosure of Invention

The invention aims to solve the technical problem in the prior art and provides a fuel supply system capable of automatically opening a choke valve by a certain opening degree when an engine is started and a semi-automatic choke valve thereof.

In order to achieve the aim, the invention provides a semi-automatic choke valve which is arranged on a body of a fuel supply system, wherein the semi-automatic choke valve comprises a choke valve shaft and a choke valve sheet arranged on the choke valve shaft, the choke valve shaft comprises a shaft body, a shaft sleeve, a choke valve rocker arm and a torsion spring, and the shaft sleeve is arranged on the body; the choke valve rocker arm is arranged on the shaft sleeve, and a limit groove is formed in the choke valve rocker arm; the shaft body is arranged in the shaft sleeve, a limiting boss matched with the limiting groove is arranged at the top end of the shaft body, and the limiting boss abuts against the limiting groove; the torsion spring is arranged on the shaft body, one end of the torsion spring is clamped on the limiting boss, and the other end of the torsion spring abuts against the limiting groove; the choke valve rocker arm rotates to drive the shaft body to rotate synchronously.

The semi-automatic choke valve comprises a rocker arm main body, a mounting hole is formed in the middle of the rocker arm main body, the limiting groove is formed in the rocker arm main body, the limiting groove is located in one side of the mounting hole and communicated with the mounting hole, and the limiting groove is provided with a first limiting surface and a second limiting surface which are arranged oppositely.

In the semi-automatic choke valve, an intersection line of the first limiting surface and the second limiting surface and an axis of the mounting hole are located on the same straight line.

In the semi-automatic choke valve, the rocker arm main body is further provided with a stop pin sliding groove, and the stop pin sliding groove is located on one side of the limiting groove and penetrates through the rocker arm main body.

The semi-automatic choke valve comprises a shaft body, wherein a choke valve sheet mounting groove is formed in the shaft body, the choke valve sheet mounting groove is a through groove penetrating through the shaft body, and the choke valve sheet is inserted into the choke valve sheet mounting groove.

In the semi-automatic choke valve, the center line of the through groove is located on the axis of the shaft body.

In the semi-automatic choke valve, the choke flap mounting groove is arranged close to the lower part of the shaft body.

In the semi-automatic choke valve, the limiting boss is located at the top end of the shaft body and extends outwards along the direction perpendicular to the axis of the shaft body, and the limiting boss is provided with a boss first limiting surface and a boss second limiting surface which are arranged oppositely.

In the semi-automatic choke valve, an intersection line of the first boss limiting surface and the second boss limiting surface is located on the same straight line with the axis of the shaft body.

In order to better achieve the purpose, the invention further provides a fuel supply system which comprises a body, a choke valve and a shifting fork, wherein the choke valve and the shifting fork are installed on the body, the shifting fork is connected with the choke valve, and the choke valve is the semi-automatic choke valve.

The invention has the beneficial effects that:

the invention can automatically open the choke valve by a certain opening degree when the engine is started, sucks more air into the mixing chamber to be mixed with fuel, dilutes the fuel so as to avoid the phenomena of difficult starting, stuffy start, explosion and the like caused by overhigh fuel concentration when the engine is started, and improves the stability of the engine starting.

The invention is described in detail below with reference to the drawings and specific examples, but the invention is not limited thereto.

Drawings

FIG. 1 is a schematic diagram of a prior art fuel delivery system;

FIG. 2 is a schematic view of the fuel supply system according to an embodiment of the present invention (choke valve fully closed);

FIG. 3 is a schematic view of the choke valve of FIG. 2 shown in an open position;

FIG. 4 is a cross-sectional view of the choke shaft of FIG. 2;

FIG. 5 is a schematic view of a choke rocker arm configuration according to one embodiment of the present invention;

FIG. 6 is a schematic view of a bushing structure according to an embodiment of the present invention;

FIG. 7 is a schematic view of a shaft structure according to an embodiment of the present invention;

FIG. 8 is a schematic view of a choke plate according to one embodiment of the present invention;

fig. 9 is a schematic view of a fork according to an embodiment of the present invention.

Wherein the reference numerals

Prior Art

10 main body

20 shifting fork

30 choke shaft

40 choke flap

The invention

1 main body

2 Shifting fork

21 handle

22 fork body

23 stop pin

3 choke shaft

31 choke valve rocker arm

311 Rocker arm body

312 mounting hole

313 limiting groove

3131 first limit surface

3132 second limit surface

314 stop pin chute

32 torsion spring

33 shaft sleeve

331 axle sleeve main body

332 axle sleeve hole

34 axle body

341 axle body

342 choke flap mounting groove

343 spacing boss

3431 first limit surface of boss

3432 second limit surface of boss

4 choke flap

Detailed Description

The invention will be described in detail with reference to the following drawings, which are provided for illustration purposes and the like:

referring to fig. 2 to 3, fig. 2 is a schematic structural view of a fuel supply system according to an embodiment of the present invention (the choke valve is fully closed), and fig. 3 is a schematic structural view of the choke valve of fig. 2 when the choke valve is opened at a certain angle. The fuel supply system comprises a body 1, and a choke valve and a shifting fork 2 which are arranged on the body 1, wherein the shifting fork 2 is connected with the choke valve, the choke valve is a semi-automatic choke valve, and the choke valve piece 4 can be automatically opened to a certain opening degree when an engine is started after the choke valve piece 4 is closed. In the starting process, the semi-automatic choke valve is acted by the suction force of the engine, the original fully-closed choke valve sheet 4 (shown in figure 2) is automatically opened by a certain angle (shown in figure 3), so that more air is sucked into the mixing chamber to be mixed with fuel, and the fuel is diluted, so that the phenomena of difficult starting, stuffer starting, blasting and the like caused by overhigh fuel concentration can be avoided when the engine is started. The composition, structure, mutual position relationship, connection relationship and function of other parts of the fuel supply system are mature prior art, so that the detailed description is omitted, and only the semi-automatic choke valve of the invention is described in detail below.

Referring to fig. 4, fig. 4 is a schematic sectional view of the choke shaft of fig. 2. The semi-automatic choke valve comprises a choke valve shaft 3 and a choke valve sheet 4 arranged on the choke valve shaft 3, wherein the choke valve shaft 3 comprises a shaft body 34, a shaft sleeve 33, a choke valve rocker arm 31 and a torsion spring 32, and the shaft sleeve 33 is arranged on the body 1; the choke valve rocker arm 31 is mounted on the shaft sleeve 33, and a limit groove 313 is formed in the choke valve rocker arm 31; the shaft body 34 is installed in the shaft sleeve 33, a limit boss 343 matched with the limit groove 313 is arranged at the top end of the shaft body 34, and the limit boss 343 abuts against the limit groove 313; the torsion spring 32 is mounted on the shaft body 34, one end of the torsion spring 32 is clamped on the limit boss 343, and the other end of the torsion spring 32 abuts against the limit groove 313; the choke rocker arm 31 rotates to drive the shaft body 34 to rotate synchronously.

Referring to FIG. 5, FIG. 5 is a schematic view of a choke rocker arm configuration in accordance with one embodiment of the present invention. The choke rocker arm 31 includes a rocker arm body 311, a mounting hole 312 is provided in the middle of the rocker arm body 311, a limiting groove 313 is provided on the rocker arm body 311, the limiting groove 313 is located on one side of the mounting hole 312 and is communicated with the mounting hole 312, and the limiting groove 313 has a first limiting surface 3131 and a second limiting surface 3132 which are oppositely disposed, respectively. Preferably, an intersection line of the first and second limiting

surfaces

3131 and 3132 is located on the same straight line with an axis of the mounting hole 312. The rocker arm main body 311 is further provided with a stop pin sliding groove 314, and the stop pin sliding groove 314 is located on one side of the limiting groove 313 and penetrates through the rocker arm main body 311.

Referring to fig. 6, fig. 6 is a schematic view of a shaft sleeve structure according to an embodiment of the present invention. The shaft sleeve 33 includes a shaft sleeve main body 331 and a shaft sleeve hole 332 disposed on the shaft sleeve main body 331, the shaft sleeve hole 332 is a through hole, and the shaft sleeve hole 332 is disposed coaxially with the shaft sleeve main body 331.

Referring to fig. 7 and 8, fig. 7 is a schematic view of a shaft structure according to an embodiment of the invention, and fig. 8 is a schematic view of a choke plate according to an embodiment of the invention. The shaft body 34 includes a shaft main body 341, and a choke flap mounting groove 342 and a stopper boss 343 provided on the shaft main body 341. The limiting boss 343 of this embodiment is located at the top end of the shaft main body 341 and extends outward along the direction perpendicular to the axis of the shaft body 34, and the limiting boss 343 has a boss first limiting surface 3431 and a boss second limiting surface 3432 which are disposed opposite to each other. Preferably, an intersection line of the boss first limiting surface 3431 and the boss second limiting surface 3432 is located on the same straight line with the axis of the shaft body 34. The shaft body 34 is provided with a choke flap mounting groove 342, the choke flap mounting groove 342 is a through groove penetrating through the shaft body 341, the choke flap 4 is inserted into the choke flap mounting groove 342, and preferably, the center line of the through groove is located on the axis of the shaft body 34. The choke flap installation groove 342 is preferably provided near a lower portion of the shaft main body 341.

Referring to fig. 9, fig. 9 is a schematic view of a fork according to an embodiment of the present invention. The fork 2 includes a fork body 22, and a handle 21 and a stopper pin 23 integrally connected to the fork body 22. The shift fork main body 22 is mounted on the body 1, and the stop pin 23 of the shift fork 2 is mounted in the stop pin sliding groove 314 of the choke rocker arm 31. The handle 21 of the shifting fork 2 is rotated, and the choke valve rocker arm 31 is driven through the stop pin 23 so as to drive the choke valve shaft 3 to rotate, so that the full opening and full closing of the choke valve piece 4 are switched. The fork 2 is usually operated manually, and the opening and closing of the choke valve are adjusted by controlling the choke valve shaft 3 from full opening to full closing. The semi-automatic choke valve can automatically open the choke valve sheet 4 at a certain angle under the suction action of the engine without rotating the shifting fork 2 when the engine is started under the condition that the choke valve sheet 4 is fully closed, so that the starting performance and the stability of the engine are improved.

The shaft sleeve 33 is sleeved on the mounting hole 312 of the choke valve rocker arm 31, and the shaft sleeve main body 331 is pressed on the body 1; the torsion spring 32 is sleeved on the shaft main body 341 of the choke shaft 3, and one end of the torsion spring 32 is hooked on the limit boss 343 of the shaft body 34; then, the shaft body 34 sleeved with the torsion spring 32 is sleeved in the shaft sleeve hole 332 of the shaft sleeve 33, at the moment, under the action force of the torsion spring 32, the first boss limiting surface 3431 of the shaft body 34 is always abutted against the first limiting surface 3131 of the choke valve rocker arm 31, and the shaft body 34 rotates along with the rotation of the choke valve rocker arm 31; the choke flap 4 is inserted into the choke flap mounting groove 342 of the shaft body 34, and the rotation from full opening to full closing of the choke flap 4 is realized along with the rotation of the shaft body 34; the shift fork 2 is installed on the body 1, and the stop pin 23 on the shift fork 2 is placed in the stop pin sliding groove 314 of the choke rocker arm 31. The handle 21 of the shifting fork 2 is rotated, the choke valve rocker arm 31 is driven to rotate through the stop pin 23, the shaft body 34 is driven to rotate, and therefore the choke valve sheet 4 rotates along with the choke valve, and full opening and full closing of the choke valve are switched. Since the shaft body 34 and the choke plate 4 are independent of each other in this structure and can rotate freely, the shaft body 34 abuts against the first stopper surface 3131 of the choke rocker arm 31 by the torsion spring 32. When the engine is started, suction is formed in the engine cavity, the choke flap 4 in the fully closed state can be automatically opened at a certain angle under the action of the suction force, more air is sucked into the mixing chamber to be mixed with fuel, and the fuel is diluted so that the phenomena of difficult starting, starting blasting and the like caused by overhigh fuel concentration can be avoided when the engine is started.

In the starting process, under the action of the suction force of the engine, the fully-closed choke flap automatically opens a certain angle, so that more air is sucked into the mixing chamber to be mixed with the fuel, the fuel is diluted, the phenomena of difficult starting, starting blasting and the like caused by overhigh fuel concentration can be avoided, and the starting stability of the engine is improved.

The present invention may be embodied in other specific forms without departing from the spirit or essential attributes thereof, and it should be understood that various changes and modifications can be effected therein by one skilled in the art without departing from the spirit and scope of the invention as defined in the appended claims.

Claims

1. A semi-automatic choke valve is installed on a body of a fuel supply system and is characterized in that the semi-automatic choke valve comprises a choke valve shaft and a choke valve sheet installed on the choke valve shaft, the choke valve shaft comprises a shaft body, a shaft sleeve, a choke valve rocker arm and a torsion spring, and the shaft sleeve is installed on the body; the choke valve rocker arm is arranged on the shaft sleeve, and a limit groove is formed in the choke valve rocker arm; the shaft body is arranged in the shaft sleeve, a limiting boss matched with the limiting groove is arranged at the top end of the shaft body, and the limiting boss abuts against the limiting groove; the torsion spring is arranged on the shaft body, one end of the torsion spring is clamped on the limiting boss, and the other end of the torsion spring abuts against the limiting groove; the choke valve rocker arm rotates to drive the shaft body to rotate synchronously.

2. The semi-automatic choke of claim 1, wherein the choke rocker arm includes a rocker arm body, a mounting hole is formed in a middle portion of the rocker arm body, the limiting groove is formed in the rocker arm body, the limiting groove is located on one side of the mounting hole and is communicated with the mounting hole, and the limiting groove has a first limiting surface and a second limiting surface which are oppositely arranged.

3. The semi-automatic choke of claim 2, wherein the intersection of the first stop surface and the second stop surface is aligned with the axis of the mounting hole.

4. The semi-automatic choke valve according to claim 2 or 3, characterized in that a stop pin sliding groove is further provided on the rocker arm main body, the stop pin sliding groove is located at one side of the limiting groove and penetrates through the rocker arm main body.

5. The semi-automatic choke of claim 4, wherein a choke plate mounting slot is provided on the shaft body, the choke plate mounting slot being a through slot extending through the shaft body, the choke plate being inserted in the choke plate mounting slot.

6. The semi-automatic choke of claim 5, wherein a centerline of the through slot is located on an axis of the shaft body.

7. The semi-automatic choke of claim 6, wherein the choke flap mounting slot is disposed proximate a lower portion of the shaft body.

8. The semi-automatic choke of claim 5, wherein the stop boss is located at the top end of the shaft body and extends outwardly in a direction perpendicular to the axis of the shaft body, the stop boss having a first stop surface and a second stop surface opposite the first stop surface.

9. The semi-automatic choke of claim 4, wherein the intersection of the first stop surface of the boss and the second stop surface of the boss is aligned with the axis of the shaft.

10. A fuel supply system comprising a body and a choke valve and a fork mounted on the body, the fork being connected to the choke valve, characterised in that the choke valve is a semi-automatic choke valve according to any one of claims 1 to 9.