Carburetor and mechanical fuel supply switching adjusting device thereof

Abstract

The carburetor comprises the mechanical fuel supply switching adjusting device, the mechanical fuel supply switching adjusting device comprises an oil storage chamber, the oil storage chamber comprises an oil storage cavity and an air chamber connecting part, and an oil supply hole is formed in the side, connected with the air chamber connecting part, of the oil storage cavity; the air chamber comprises an air chamber body, a first air pipe and a second air pipe, the air chamber body is installed on the air chamber connecting part, and a first air cavity and a second air cavity are formed in the air chamber body and communicated with the first air pipe and the second air pipe respectively; an air cavity sealing surface is arranged between the first air cavity and the second air cavity; the switching mechanism comprises an oil needle and a gas sealing ring, the oil needle is arranged corresponding to the oil supply hole, and the gas sealing ring sleeves the oil needle and is arranged corresponding to the gas cavity sealing surface; the oil needle is respectively provided with a closing position and an opening position relative to the oil supply hole; the gas sealing ring is respectively provided with a loosening position and a sealing position relative to the gas cavity sealing surface; and the adjusting mechanism is connected with the switching mechanism and controls the switching mechanism to be switched between the fuel oil passage and the fuel gas passage.

Description

Technical Field

[0001] The utility model relates to a fuel supply technology, in particular to a carburetor and a mechanical fuel supply switching and regulating device thereof. Background Art

[0002] The existing engine fuel forms are becoming increasingly diversified. In the same engine, there are more and more cases where two or more fuels are used for combustion work simultaneously. For the fuel switching forms of multi-fuel supply, there are various forms, such as electronic type, mechanical type, etc., but the switching and regulating structures are relatively complex, which easily leads to problems such as inconvenient switching operation and unstable switching state. Content of the Utility Model

[0003] The technical problem to be solved by the utility model is to provide a carburetor and a mechanical fuel supply switching and regulating device thereof in view of the above-mentioned defects of the prior art.

[0004] To achieve the above object, the utility model provides a mechanical fuel supply switching and regulating device, which includes:

[0005] An oil storage chamber, including an oil storage cavity and an air chamber connection part, and an oil supply hole is arranged on one side of the oil storage cavity connected to the air chamber connection part;

[0006] An air chamber, including an air chamber body, a first air pipe and a second air pipe, the air chamber body is installed on the air chamber connection part, a first air cavity and a second air cavity are arranged in the air chamber body, and are respectively communicated with the first air pipe and the second air pipe; an air cavity sealing surface is arranged between the first air cavity and the second air cavity;

[0007] A switching mechanism, including an oil needle and a gas sealing ring, the oil needle is arranged corresponding to the oil supply hole, and the gas sealing ring is sleeved on the oil needle and arranged corresponding to the air cavity sealing surface; the oil needle respectively has a closed position and an open position relative to the oil supply hole; the gas sealing ring respectively has a loosened position and a sealed position relative to the air cavity sealing surface; and

[0008] An adjusting mechanism, connected to the switching mechanism and controlling the switching mechanism to switch between a fuel passage and a gas passage;

[0009] Wherein, when the oil needle is in the closed position, the gas sealing ring is in the loosened position, the oil supply hole is sealed, the first air cavity and the second air cavity are communicated, the fuel passage is closed and the gas passage is opened; when the oil needle is in the open position, the gas sealing ring is in the sealed position, the oil supply hole is opened, the first air cavity and the second air cavity are isolated, the gas passage is closed and the fuel passage is opened.

[0010] The above-mentioned mechanical fuel supply switching and regulating device, wherein the regulating mechanism includes:

[0011] A wire fixing bracket, which is installed on the air chamber body;

[0012] A wire, which is installed on the wire fixing bracket through a wire sheath, and a wire joint is installed at the bottom of the wire;

[0013] A conversion rocker arm, which is pivotally connected to the wire fixing bracket through a pin shaft and is connected to the switching mechanism; the wire joint is connected to the conversion rocker arm; and

[0014] A tension spring, one end of which is connected to the conversion rocker arm, and the other end of the tension spring is connected to the air chamber body.

[0015] The above-mentioned mechanical fuel supply switching and regulating device, wherein the switching mechanism further includes a pull rod, a pull rod hanging port is provided on the conversion rocker arm, a guiding hole is provided on the oil storage chamber, an air chamber through hole is provided on the air chamber body, and one end of the pull rod passes through the guiding hole and the air chamber through hole to be connected to the pull rod hanging port; the other end of the pull rod is connected to the fuel injection needle, and the conversion rocker arm drives the fuel injection needle to switch between the closed position and the open position through the pull rod.

[0016] The above-mentioned mechanical fuel supply switching and regulating device, wherein the axis of the pull rod is coaxial with the center line of the fuel injection needle, and the axis of the pull rod is parallel to the axis of the tension spring.

[0017] The above-mentioned mechanical fuel supply switching and regulating device, wherein the wire fixing bracket is provided with a wire positioning hole, a wire through hole, a pull rod through hole, a fixing bracket mounting hole and a first pin shaft mounting hole, the wire sheath is installed in the wire positioning hole, and the wire positioning hole and the wire through hole are coaxially arranged; the pull rod through hole corresponds to the air chamber through hole; the fixing bracket mounting hole and the pull rod through hole are located on the same plane; the first pin shaft mounting hole is symmetrically arranged on a U-shaped convex platform, and the axis of the first pin shaft mounting hole is perpendicular to the axis of the pull rod through hole.

[0018] The above-mentioned mechanical fuel supply switching and regulating device, wherein the conversion rocker arm is provided with a first rocker arm surface and a second rocker arm surface that are parallel to each other, and second pin shaft mounting holes are provided on the first rocker arm surface and the second rocker arm surface corresponding to the first pin shaft mounting hole; the U-shaped convex platform is clamped between the first rocker arm surface and the second rocker arm surface; a wire mounting hole and a second tension spring hanging hole are further provided on the first rocker arm surface; the first rocker arm surface and the second rocker arm surface are connected through a third rocker arm surface, and the pull rod hanging port is provided on the third rocker arm surface.

[0019] The above-mentioned mechanical fuel supply switching and regulating device, wherein the cable joint includes a fixed head, on which a cable hanging groove and a retaining ring mounting groove are provided, and the end of the cable is mounted in the cable hanging groove; the retaining ring mounting groove is provided at one end of the fixed head connected to the cable mounting hole.

[0020] The above-mentioned mechanical fuel supply switching and regulating device, wherein the fuel needle cooperates with the fuel needle sealing surface of the fuel supply hole through the needle head provided at the top end, and the fuel needle is connected to the pull rod through the fuel needle fixing thread provided at the tail end; the gas sealing ring is connected to the fuel needle fixing thread through the sealing fixing plate.

[0021] The above-mentioned mechanical fuel supply switching and regulating device, wherein the switching mechanism further includes a diaphragm, a positioning boss is provided in the middle of the fuel needle, and the diaphragm is sleeved on the fuel needle and abuts against the positioning boss.

[0022] In order to better achieve the above object, the present invention further provides a carburetor, which includes the above-mentioned mechanical fuel supply switching and regulating device.

[0023] The beneficial effects of the present invention are as follows:

[0024] The present invention drives the conversion rocker arm to rotate through the cable of the regulating mechanism, so that the pull rod of the switching mechanism drives the fuel needle and the gas sealing ring to act, changing the on-off of the supply path of the fuel raw material in the dual-fuel (fuel, gas) supply system, and further adjusting the fuel raw material supplied in the dual-fuel supply system as needed, so that fuel or gas can be freely switched as the fuel supply source when the carburetor works.

[0025] The present invention will be described in detail below in conjunction with the accompanying drawings and specific embodiments, but it is not a limitation to the present invention. BRIEF DESCRIPTION OF THE DRAWINGS

[0026] Figure 1A Schematic structural diagram of the mechanical fuel supply switching and regulating device according to an embodiment of the present invention;

[0027] Figure 1B For Figure 1A Internal structural diagram;

[0028] Figure 2 Schematic structural diagram of the fuel storage chamber according to an embodiment of the present invention;

[0029] Figure 3A Schematic structural diagram of the air chamber body according to an embodiment of the present invention;

[0030] Figure 3B For Figure 3A Another direction structural diagram of the air chamber body shown;

[0031] Figure 4 Schematic diagram of the cable structure according to an embodiment of the present utility model;

[0032] Figure 5 Schematic diagram of the cable joint structure according to an embodiment of the present utility model;

[0033] Figure 6 Schematic diagram of the cable fixing bracket structure according to an embodiment of the present utility model;

[0034] Figure 7 Schematic diagram of the conversion rocker arm structure according to an embodiment of the present utility model;

[0035] Figure 8 Schematic diagram of the pull rod structure according to an embodiment of the present utility model;

[0036] Figure 9 Schematic diagram of the fuel needle structure according to an embodiment of the present utility model;

[0037] Figure 10 Schematic diagram of the gas sealing ring structure according to an embodiment of the present utility model.

[0038] Among them, the reference numerals

[0039] 1 Fuel storage chamber

[0040] 11 Fuel storage cavity

[0041] 12 Guide hole

[0042] 13 Diaphragm sealing groove

[0043] 14 Carburetor fuel injection chamber

[0044] 15 Fuel supply hole

[0045] 16 Fuel needle sealing surface

[0046] 2 Gas chamber

[0047] 21 Gas chamber body

[0048] 211 First mounting hole

[0049] 212 Second mounting hole

[0050] 213 Gas chamber through hole

[0051] 214 First gas cavity

[0052] 215 Second gas cavity

[0053] 216 Sealing surface

[0054] 217 First spring hanging hole

[0055] 22 First air pipe

[0056] 23rd second air pipe

[0057] 3 Adjusting mechanism

[0058] 31 Pull wire

[0059] 311 Wire rope

[0060] 312 Wire head

[0061] 32 Pull wire sheath

[0062] 33 Pull wire fixing bracket

[0063] 331 Pull wire positioning hole

[0064] 332 Pull wire positioning surface

[0065] 333 Pull wire through hole

[0066] 334 Rod through hole

[0067] 335 Bracket mounting hole

[0068] 336 First pin mounting hole 34 Conversion rocker arm

[0069] 341 Rod hanging mouth

[0070] 342 Second pin mounting hole 343 Pull wire mounting hole

[0071] 344 Second spring hanging hole

[0072] 35 Pull wire joint

[0073] 351 Pull wire hanging groove

[0074] 352 Fixed head

[0075] 353 Retaining ring mounting groove

[0076] 36 Pin

[0077] 37 Spring

[0078] 4 Switching mechanism

[0079] 41 Needle valve

[0080] 411 Needle valve fixing thread

[0081] 412 Positioning boss

[0082] 413 Needle tip

[0083] 42 Diaphragm

[0084] 43 Gas sealing ring

[0085] 431 Sealing rib surface

[0086] 432 Sealing and fixing groove

[0087] 44 Sealing and fixing plate

[0088] 45 Pull rod

[0089] 451 Conversion rocker arm hanging groove Specific implementation mode

[0090] The structural principle and working principle of the present invention will be specifically described below in conjunction with the accompanying drawings:

[0091] The carburetor of the present utility model includes a mechanical fuel supply switching and regulating device. The composition, structure, mutual positional relationship, connection relationship and functions of other components of the carburetor are all relatively mature prior arts, so they will not be elaborated here. Only the mechanical fuel supply switching and regulating device of the present utility model will be described in detail below.

[0092] See Figures 1A - 3B , Figure 1A which is a schematic structural diagram of the mechanical fuel supply switching and regulating device according to an embodiment of the present utility model, Figure 1B is Figure 1A the internal structural diagram of Figure 2 which is a schematic structural diagram of the oil storage chamber 1 according to an embodiment of the present utility model, Figure 3A which is a schematic structural diagram of the air chamber body 21 according to an embodiment of the present utility model, Figure 3B is Figure 3AAnother schematic structural view of the air chamber body 21 shown. The mechanical fuel supply switching and regulating device of the present utility model includes: an oil storage chamber 1, including an oil storage cavity 11 and an air chamber connection part. On one side where the oil storage cavity 11 is connected to the air chamber connection part, an oil supply hole 15 is provided corresponding to the fuel injection cavity 14 of the carburetor. An oil needle sealing surface 16 is provided on the oil supply hole 15, and a guide hole 12 and a diaphragm sealing groove 13 are provided on the air chamber connection part; an air chamber 2, including an air chamber body 21, a first air pipe 22 and a second air pipe 23. The first air pipe 22 and the second air pipe 23 are an intake pipe and an exhaust pipe respectively; the air chamber body 21 is installed on the air chamber connection part. A first air cavity 214 and a second air cavity 215 are provided in the air chamber body 21, which are respectively communicated with the first air pipe 22 and the second air pipe 23; an air cavity sealing surface 216 is provided between the first air cavity 214 and the second air cavity 215; a switching mechanism 4, including an oil needle 41 and a gas sealing ring 43. The oil needle 41 is provided corresponding to the oil supply hole 15, and the gas sealing ring 43 is sleeved on the oil needle 41 and is provided corresponding to the air cavity sealing surface 216; the oil needle 41 has a closed position and an open position respectively relative to the oil supply hole 15; the gas sealing ring 43 has a loose position and a sealing position respectively relative to the air cavity sealing surface 216; and an adjusting mechanism 3, connected to the switching mechanism 4 and controlling the switching mechanism 4 to switch between a fuel passage and a gas passage; wherein, when the oil needle 41 is in the closed position, the gas sealing ring 43 is in the loose position, the oil supply hole 15 is sealed and the first air cavity 214 and the second air cavity 215 are communicated, the fuel passage is closed and the gas passage is open; when the oil needle 41 is in the open position, the gas sealing ring 43 is in the sealing position, the oil supply hole 15 is open and the first air cavity 214 and the second air cavity 215 are isolated, the gas passage is closed and the fuel passage is open, that is, the fuel passage and the gas passage are switched synchronously. When the fuel passage is open, the gas passage is closed, and when the gas passage is open, the fuel passage is closed.

[0093] In this embodiment, the air chamber 2 and the oil storage chamber 1 are horizontally distributed as an example. The positions of the air chamber 2 and the oil storage chamber 1 can also be adjusted according to the spatial layout of the engine. For example, the air chamber 2 and the oil storage chamber 1 can be vertically distributed, and the air chamber 2 is placed under the oil storage chamber 1. In this embodiment, the natural working state is that the gas passage is closed and the fuel passage is unobstructed. It is also possible to adjust the relative positions of the wire installation hole 343, the second spring hanging hole 344 and the second pin installation hole 342 of the conversion rocker arm 34 so that the gas passage is unobstructed and the fuel passage is closed as the natural working state, as long as it can ensure that the gas passage and the fuel passage can be switched synchronously, and one of them is unobstructed and the other is closed, and no restrictions are imposed on this.

[0094] See Figures 4 - 6 , Figure 4This is a schematic diagram of the structure of the pull wire 31 according to an embodiment of the utility model. Figure 5 This is a schematic diagram of the structure of a wire connector 35 according to an embodiment of the utility model. Figure 6 The schematic diagram of the structure of the wire fixing frame 33 of one embodiment of the utility model. In this embodiment, the adjustment mechanism 3 includes: a wire fixing frame 33, which is installed on the air chamber body 21; a wire 31, which is installed on the wire fixing frame 33 through a wire sheath 32, and a wire connector 35 is installed at the bottom of the wire 31; a switching rocker arm 34, which is pivotally connected to the wire fixing frame 33 through a pin 36 and connected to the switching mechanism 4; the wire connector 35 is connected to the switching rocker arm 34; and a tension spring 37, one end of which is connected to the switching rocker arm 34, and the other end of the tension spring 37 is connected to the air chamber body 21.

[0095] like Figure 5 As shown, the pull wire joint 35 includes a fixed head 352, and the fixed head 352 is provided with a pull wire hanging groove 351 and a retaining ring installation groove 353. The pull wire 31 includes a wire rope 311 and a wire end 312. The wire end 312 is installed in the pull wire hanging groove 351, one end of the wire rope 311 is connected to the wire end 312, and the other end of the wire rope 311 passes through the pull wire through hole 333 and enters the pull wire sheath 32 and then passes out; the retaining ring installation groove 353 is arranged at one end of the fixed head 352 connected to the pull wire installation hole 343.

[0096] like Figure 6 As shown, the wire fixing frame 33 of the present embodiment is provided with a wire positioning hole 331, a wire through hole 333, a pull rod through hole 334, a fixing frame mounting hole 335 and a first pin shaft mounting hole 336, the wire pulling sleeve 32 is installed in the wire pulling positioning hole 331, the bottom end of the wire pulling sleeve 32 is located on the wire pulling positioning surface 332, the wire pulling positioning hole 331 and the wire pulling through hole 333 are coaxially arranged; the pull rod through hole 334 is arranged corresponding to the air chamber through hole 213; the fixing frame mounting hole 335 and the pull rod through hole 334 are located on the same plane; the first pin shaft mounting hole 336 is symmetrically arranged on a U-shaped boss, and the axis of the first pin shaft mounting hole 336 is perpendicular to the axis of the pull rod through hole 334; the U-shaped boss is engaged with the inner side of the switching rocker arm 34.

[0097] See also Figure 7 , Figure 7Schematic diagram of the structure of the conversion rocker arm 34 according to an embodiment of the present utility model. The conversion rocker arm 34 is provided with a first rocker arm surface and a second rocker arm surface parallel to each other corresponding to the U-shaped boss, and second pin mounting holes 342 are provided on the first rocker arm surface and the second rocker arm surface corresponding to the first pin mounting hole 336; a wire installation hole 343 and a second tension spring hanging hole 344 are further provided on the first rocker arm surface; the first rocker arm surface and the second rocker arm surface are connected by a third rocker arm surface, and the pull rod hanging opening 341 is provided on the third rocker arm surface.

[0098] See Figure 8 , Figure 8 Schematic diagram of the structure of the pull rod 45 according to an embodiment of the present utility model. The switching mechanism 4 of this embodiment further includes a pull rod 45. A pull rod hanging opening 341 is provided on the conversion rocker arm 34. A guide hole 12 is provided on the oil storage chamber 1, and an air chamber through hole 213 is provided on the air chamber body 21. One end of the pull rod 45 passes through the guide hole 12 and the air chamber through hole 213 and is connected to the pull rod hanging opening 341; the other end of the pull rod 45 is connected to the fuel injection needle 41, and the conversion rocker arm 34 drives the fuel injection needle 41 to switch between the closed position and the open position through the pull rod 45. Wherein, the axis of the pull rod 45 is coaxial with the center line of the fuel injection needle 41, and the axis of the pull rod 45 is parallel to the axis of the tension spring 37.

[0099] See Figure 9 and Figure 10 , Figure 9 Schematic diagram of the structure of the fuel injection needle 41 according to an embodiment of the present utility model, Figure 10 Schematic diagram of the structure of the gas sealing ring 43 according to an embodiment of the present utility model. In this embodiment, the fuel injection needle 41 is matched with the fuel injection needle sealing surface 16 of the fuel supply hole 15 through the needle head 413 provided at the top end, and the fuel injection needle 41 is connected to the pull rod 45 through the fuel injection needle fixing thread 411 provided at the tail end; the gas sealing ring 43 is connected to the fuel injection needle fixing thread 411 through the sealing fixing plate 44. Wherein, the switching mechanism 4 further includes a diaphragm 42. A positioning boss 412 is provided in the middle of the fuel injection needle 41, and the diaphragm 42 is sleeved on the fuel injection needle 41 and abuts against the positioning boss 412.

[0100] During the assembly of this embodiment, first press-fit the air tube pressing heads of the first air tube 22 and the second air tube 23 onto the air inlet and outlet tube mounting holes of the air chamber 2, namely the first mounting hole 211 and the second mounting hole 212; first pass the diaphragm 42 through the oil needle fixing thread 411 of the oil needle 41; the sealing fixing groove 432 of the gas sealing ring 43 is sleeved on the sealing fixing plate 44 and then passed through the oil needle fixing thread 411 of the oil needle 41; then lock the pull rod 45 to the oil needle fixing thread 411 to assemble the oil needle assembly; install this oil needle assembly onto the oil storage chamber 1, the needle tip 413 of the oil needle 41 passes through the guiding hole 12 of the oil storage chamber 1, and the diaphragm 42 is sleeved in the diaphragm sealing groove 13 of the oil storage chamber 1; pass the pull rod 45 through the air chamber through-hole 213 and install it onto the guiding hole 12 of the oil storage chamber 1; then align the screw mounting holes of the air chamber 2 and the oil storage chamber 1 and lock them with screws. Pass the pull rod 45 through the pull rod through-hole 334 of the wire fixing bracket 33 to make the wire fixing bracket 33 close to the air chamber 2; align the fixing bracket mounting hole 335 and the screw mounting hole of the air chamber 2 and lock them with screws. Hang the pull rod hook 341 of the conversion rocker arm 34 onto the conversion rocker arm hook groove 451 of the pull rod 45, align the second pin mounting hole 342 of the conversion rocker arm 34 and the first pin mounting hole 336 of the wire fixing bracket 33, insert the pin 36, and clamp it with an open circlip in the circlip groove of the pin 36. Pass the wire joint 35 through the wire mounting hole 343 of the conversion rocker arm 34 and clamp it with an open circlip in the circlip mounting groove 353 of the wire joint 35. Hang the two ends of the tension spring 37 onto the first tension spring hanging hole 217 of the air chamber 2 and the second tension spring hanging hole 344 of the conversion rocker arm 34 respectively. Finally, pass the cord 311 of the wire 31 into the wire sheath 32, and hang the wire end 312 of the wire 31 on the wire hanging groove 351 of the wire joint 35.

[0101] During operation, if the carburetor burns with fuel as the fuel supply source, the wire 31 does not move, the tension spring 37 tightens, the conversion rocker arm 34 rotates with the pin 36 as the rotation origin, pulls out the oil needle assembly, makes the sealing rib surface 431 of the gas sealing ring 43 close to the sealing surface 216 of the air chamber 2, and the needle tip 413 of the oil needle 41 moves away from the oil needle sealing surface 16 of the fuel supply hole 15. At this time, the gas passage is closed and the fuel passage (through the fuel supply hole 15 of the oil storage chamber 1) is unobstructed. If the carburetor burns with gas as the fuel supply source, lift the wire 31, the conversion rocker arm 34 rotates with the pin 36 as the rotation origin, presses the oil needle assembly in, makes the sealing rib surface 431 of the gas sealing ring 43 away from the sealing surface 216 of the air chamber 2, and the needle tip 413 of the oil needle 41 presses tightly on the oil needle sealing surface 16 of the fuel supply hole 15. At this time, the gas passage is unobstructed (i.e., the first air cavity 214 and the second air cavity 215 are in communication), and the fuel passage is closed.

[0102] The utility model drives the conversion rocker arm 34 to rotate through the draw wire 31 of the adjusting mechanism 3, so that the draw bar 45 of the switching mechanism 4 drives the fuel needle 41 and the gas sealing ring 43 to act, changing the on-off of the supply path of the fuel raw material in the dual-fuel (fuel, gas) supply system, and further adjusting the fuel raw material supplied in the dual-fuel supply system as required, so that fuel or gas can be freely switched as the fuel supply source when the carburetor works.

[0103] Certainly, the utility model can also have many other embodiments. Without departing from the spirit and essence of the utility model, those skilled in the art can make various corresponding changes and deformations according to the utility model. However, these corresponding changes and deformations should all fall within the protection scope of the appended claims of the utility model.

Claims

1. A mechanical fuel supply switching and adjusting device, characterized in that: include: The oil storage chamber comprises an oil storage cavity and an air chamber connecting portion, wherein an oil supply hole is arranged on one side where the oil storage cavity is connected to the air chamber connecting portion; The air chamber comprises an air chamber body, a first air pipe and a second air pipe, wherein the air chamber body is mounted on the air chamber connecting portion, and a first air cavity and a second air cavity are arranged in the air chamber body, respectively connected with the first air pipe and the second air pipe; an air cavity sealing surface is arranged between the first air cavity and the second air cavity; The switching mechanism comprises an oil needle and a gas sealing ring, wherein the oil needle is arranged corresponding to the oil supply hole, and the gas sealing ring is sleeved on the oil needle and arranged corresponding to the gas cavity sealing surface; the oil needle has a closing position and an opening position relative to the oil supply hole; the gas sealing ring has a loosening position and a sealing position relative to the gas cavity sealing surface; as well as A regulating mechanism connected to the switching mechanism and controlling the switching mechanism to switch between the fuel passage and the gas passage; Wherein, when the oil needle is located at the closed position, the gas sealing ring is located at the loosened position, the oil supply hole is sealed and the first air cavity and the second air cavity are connected, the fuel passage is closed and the gas passage is opened; When the oil needle is located at the open position, the gas sealing ring is located at the sealing position, the oil supply hole is opened and the first air cavity is isolated from the second air cavity, the gas passage is closed and the fuel passage is opened.

2. The mechanical fuel supply switching adjustment device according to claim 1, characterized in that: The regulating mechanism comprises: A wire fixing frame, mounted on the air chamber body; A pull wire is installed on the pull wire fixing frame through a pull wire sheath, and a pull wire connector is installed at the bottom of the pull wire; The switching rocker arm is pivotally connected to the cable fixing frame through a pin shaft and is connected to the switching mechanism; the cable connector is connected to the switching rocker arm; and A tension spring, one end of which is connected to the conversion rocker arm, and the other end of which is connected to the air chamber body.

3. The mechanical fuel supply switching adjustment device according to claim 2, characterized in that: The switching mechanism also includes a pull rod, a pull rod hanging port is provided on the switching rocker arm, a guide hole is provided on the oil storage chamber, and an air chamber through hole is provided on the air chamber body. One end of the pull rod passes through the guide hole and the air chamber through hole and is connected to the pull rod hanging port; the other end of the pull rod is connected to the oil needle, and the switching rocker arm drives the oil needle to switch between the closed position and the open position through the pull rod.

4. The mechanical fuel supply switching adjustment device according to claim 3, characterized in that: The axis of the pull rod is coaxial with the center line of the oil needle, and the axis of the pull rod is parallel to the axis of the tension spring.

5. The mechanical fuel supply switching adjustment device according to claim 3, characterized in that: The wire fixing frame is provided with a wire positioning hole, a wire through hole, a pull rod through hole, a fixing frame mounting hole and a first pin shaft mounting hole. The wire sheath is installed in the wire positioning hole, and the wire positioning hole and the wire through hole are coaxially arranged; the pull rod through hole is arranged corresponding to the air chamber through hole; the fixing frame mounting hole and the pull rod through hole are located on the same plane; the first pin shaft mounting hole is symmetrically arranged on a U-shaped boss, and the axis of the first pin shaft mounting hole is perpendicular to the axis of the pull rod through hole.

6. The mechanical fuel supply switching adjustment device according to claim 5, characterized in that: The conversion rocker arm is provided with a first rocker arm surface and a second rocker arm surface parallel to each other, and a second pin shaft mounting hole is provided on the first rocker arm surface and the second rocker arm surface corresponding to the first pin shaft mounting hole; the U-shaped boss is clamped between the first rocker arm surface and the second rocker arm surface; a pull wire mounting hole and a second tension spring hanging hole are also provided on the first rocker arm surface; the first rocker arm surface and the second rocker arm surface are connected through a third rocker arm surface, and the pull rod hanging opening is provided on the third rocker arm surface.

7. The mechanical fuel supply switching adjustment device according to claim 6, characterized in that: The wire pulling joint comprises a fixed head, on which a wire pulling hanging groove and a retaining ring installation groove are arranged, and the wire end of the wire pulling is installed in the wire pulling hanging groove; the retaining ring installation groove is arranged at one end where the fixed head is connected to the wire pulling installation hole.

8. The mechanical fuel supply switching adjustment device according to claim 3, characterized in that: The oil needle cooperates with the oil needle sealing surface of the oil supply hole through a needle head arranged at the top end, and the oil needle is connected to the pull rod through an oil needle fixing thread arranged at the tail end; the gas sealing ring is connected to the oil needle fixing thread through a sealing fixing plate.

9. The mechanical fuel supply switching adjustment device according to claim 7, characterized in that: The switching mechanism further comprises a diaphragm, a positioning boss is arranged in the middle of the oil needle, and the diaphragm is sleeved on the oil needle and abuts against the positioning boss.

10. A carburetor, characterized in that: It comprises the mechanical fuel supply switching and regulating device as described in any one of claims 1-9.

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