CN212079477U

CN212079477U - Diaphragm type carburetor

Info

Publication number: CN212079477U
Application number: CN202020236598.5U
Authority: CN
Inventors: 余剑; 李志军; 张进
Original assignee: Zhejiang YAT Electrical Appliance Co Ltd
Current assignee: Zhejiang YAT Electrical Appliance Co Ltd
Priority date: 2020-03-02
Filing date: 2020-03-02
Publication date: 2020-12-04
Anticipated expiration: 2030-03-02

Abstract

The utility model discloses a diaphragm type carburetor, including body, needle valve, advance oil pipe and return oil pipe, measurement room, oil feed route and oil storage room have been seted up to the centre of body, and the front end of oil feed route communicates to the oil storage room, and the rear end of oil feed route communicates to the measurement room, and the needle valve setting is in the break-make of oil feed route department with control oil feed route, advances oil pipe and communicates to the oil storage room, returns oil pipe and communicates to the part that oil storage room or oil feed route lie in between oil storage room and the needle valve. The oil inlet pipe inputs excessive fuel oil into the oil storage chamber, part of the fuel oil flows into the oil inlet passage, and the excessive fuel oil flows back to the oil tank through the oil return pipe, so that the oil conveying speed of the oil inlet passage to the metering chamber is constant in the opening state of the needle valve, and the oil speed is determined only by the shape and the size of the oil inlet passage. Under the condition that the needle valve is closed, the oil inlet passage is blocked by the needle valve, fuel oil of the oil return pipe cannot flow into the metering chamber, and the oil quantity in the corresponding metering chamber is constant.

Description

Diaphragm type carburetor

[ technical field ] A method for producing a semiconductor device

The utility model relates to a diaphragm type carburetor belongs to the garden instrument field.

[ background of the invention ]

In recent years, with the emergence of a new lubricating system of a small four-stroke gasoline engine, the small four-stroke gasoline engine can be turned over and used at will, so that the application of the small four-stroke gasoline engine is promoted to be expanded to forestry tools and garden tools which need more stations for operation and use, such as handheld chain saws, handheld cutting machines, pruning shears and the like.

The small four-stroke gasoline engine with the application is generally a diaphragm type rotary valve carburetor and a diaphragm type disc carburetor commonly used for a two-stroke gasoline engine at present. The outlet of the oil return pipe in the diaphragm carburetor with the traditional structure is communicated with the metering chamber, when the four-stroke engine is started, fuel oil in the metering chamber is sucked into the combustion chamber by the negative pressure of the air inlet, meanwhile, part of the fuel oil in the oil return pipe is also sucked into the metering chamber, so that the oil inlet flow is increased, the mixed gas is excessively thick, the machine is not easy to start, the operation control of the opening degree of a throttle valve is needed, the starter is required to be pressed or repeatedly operated to start, and the operation is very troublesome.

[ Utility model ] content

The utility model aims to solve the technical problem that the not enough of prior art is overcome and a more stable diaphragm formula carburetor of oil feed is provided.

Solve the technical problem, the utility model discloses a following technical scheme:

a diaphragm type carburetor comprises a body, a needle valve, an oil inlet pipe and an oil return pipe, wherein a metering chamber, an oil inlet passage and an oil storage chamber are formed in the middle of the body, the front end of the oil inlet passage is communicated to the oil storage chamber, the rear end of the oil inlet passage is communicated to the metering chamber, the needle valve is arranged at the oil inlet passage to control the on-off of the oil inlet passage, the oil inlet pipe is communicated to the oil storage chamber, and the oil return pipe is communicated to the oil storage chamber or the part of the oil inlet passage between the oil storage chamber and.

The utility model has the advantages that:

the oil inlet pipe inputs excessive fuel oil into the oil storage chamber, part of the fuel oil flows into the oil inlet passage, and the excessive fuel oil flows back to the oil tank through the oil return pipe, so that the oil conveying speed of the oil inlet passage to the metering chamber is constant in the opening state of the needle valve, and the oil speed is determined only by the shape and the size of the oil inlet passage. Under the condition that the needle valve is closed, the oil inlet passage is blocked by the needle valve, fuel oil of the oil return pipe cannot flow into the metering chamber, and the oil quantity in the corresponding metering chamber is constant.

The utility model discloses still include the oil feed filter screen, the oil feed filter screen sets up at the front end of oil feed route, and the front end of oil feed route communicates to the oil storage chamber through the oil feed filter screen.

Fuel cell room has been seted up to the centre of body, the air inlet has been seted up to the bottom of body, and air inlet and fuel cell all communicate to the measurement room.

The utility model discloses still include upper cover and lower cover, the upper cover lid closes on the open-top of oil storage chamber, and the lower cover lid closes on the bottom opening of measurement room.

Other features and advantages of the present invention will be disclosed in more detail in the following detailed description and the accompanying drawings.

[ description of the drawings ]

The invention will be further explained with reference to the drawings:

FIG. 1 is a schematic sectional view of a comparative example of the present invention;

fig. 2 is a schematic perspective view of embodiment 1 of the present invention;

fig. 3 is a schematic front sectional view of embodiment 1 of the present invention;

fig. 4 is a schematic front sectional view of embodiment 2 of the present invention.

[ detailed description ] embodiments

The technical solutions of the embodiments of the present invention are explained and explained below with reference to the drawings of the embodiments of the present invention, but the embodiments described below are only preferred embodiments of the present invention, and not all embodiments. Based on the embodiments in the embodiment, other embodiments obtained by those skilled in the art without any creative work belong to the protection scope of the present invention.

In the following description, the appearances of the indicating orientation or positional relationship, such as the terms "inner", "outer", "upper", "lower", "left", "right", etc., are only for convenience in describing the embodiments and for simplicity of description, and do not indicate or imply that the device or element being referred to must have a particular orientation, be constructed and operated in a particular orientation, and are not to be construed as limiting the invention.

Comparative example:

referring to fig. 1, the present comparative embodiment provides a diaphragm type carburetor including a body 1, a needle valve 2, an oil inlet pipe 3, and an oil return pipe 4.

The middle of the body 1 is provided with a fuel chamber 8, a metering chamber 5, an oil inlet passage 6 and an oil storage chamber 7, and the bottom of the body 1 is provided with an air inlet 9. The oil inlet pipe 3 is communicated to the oil storage chamber 7, the front end of the oil inlet passage 6 is communicated to the oil storage chamber 7, the rear end of the oil inlet passage 6 is communicated to the metering chamber 5, and the air inlet 9 and the fuel oil chamber 8 are communicated to the metering chamber 5. The oil return pipe 4 is communicated to the metering chamber 5 through an oil return port 13 formed in the body 1. The needle valve 2 is provided at the oil feed passage 6 to control opening and closing of the oil feed passage 6.

When the diaphragm carburetor needs to be started for work, negative pressure is generated at the air inlet 9, fuel oil in the metering chamber 5 is sucked into the fuel oil chamber 8, meanwhile, part of fuel oil in the oil return pipe 4 is also sucked into the metering chamber 5, so that the oil inlet amount in the fuel oil chamber 8 is increased, the fuel oil concentration in mixed gas is too high, the diaphragm carburetor is not easy to start, the opening of the throttle valve needs to be controlled, the diaphragm carburetor can be used only by operating the starter for many times, and the diaphragm carburetor is very inconvenient to operate.

Example 1:

referring to fig. 2 to 3, the present embodiment provides a diaphragm type carburetor including a body 1, a needle valve 2, an oil inlet pipe 3, and an oil return pipe 4.

The middle of the body 1 is provided with a fuel chamber 8, a metering chamber 5, an oil inlet passage 6 and an oil storage chamber 7, and the bottom of the body 1 is provided with an air inlet. The oil inlet pipe 3 is communicated to the oil storage chamber 7, the front end of the oil inlet passage 6 is communicated to the oil storage chamber 7, the rear end of the oil inlet passage 6 is communicated to the metering chamber 5, the needle valve 2 is arranged at the oil inlet passage 6 to control the on-off of the oil inlet passage 6, and the air inlet and the fuel oil chamber 8 are communicated to the metering chamber 5. The oil return pipe 4 is communicated to the oil storage chamber 7, the oil inlet pipe 3 and the oil return pipe 4 are connected to the oil inlet pipe 3 in parallel, so that after the needle valve 2 is disconnected from the oil inlet passage 6, the oil inlet pipe 3 and the oil return pipe 4 are both disconnected from the metering chamber 5 at the same time, and fuel oil in the corresponding oil return pipe 4 cannot be sucked into the metering chamber 5.

The needle valve 2 is opened, the oil inlet pipe 3 inputs excessive fuel oil into the oil storage chamber 7, a part of the fuel oil flows into the oil inlet passage 6, the excessive fuel oil flows back to the oil tank through the oil return pipe 4, the oil speed in the oil inlet passage 6 is only determined by the shape and the size of the oil inlet passage 6, therefore, the oil delivery speed of the oil inlet passage 6 to the metering chamber 5 is constant, and the fuel oil concentration in the mixed gas correspondingly entering the fuel oil chamber 8 is moderate and stable.

The needle valve 2 is closed, the oil inlet passage 6 is blocked by the needle valve 2, the fuel oil of the oil return pipe 4 cannot flow into the metering chamber 5, and the oil quantity in the metering chamber 5 is constant under the non-working state of the corresponding diaphragm type carburetor.

Preferably, the diaphragm carburetor of the present embodiment further includes an oil inlet filter 10, the oil inlet filter 10 is disposed at the front end of the oil inlet passage 6, and the front end of the oil inlet passage 6 is communicated to the oil storage chamber 7 through the oil inlet filter 10, so as to filter impurities in the fuel oil entering the oil inlet passage 6.

The utility model discloses still include upper cover 11 and lower cover 12, upper cover 11 lid closes on the open-top of oil storage chamber 7, and lower cover 12 lid closes on the bottom opening of measurement room 5.

Example 2:

referring to fig. 4, the present embodiment provides a diaphragm type carburetor including a body 1, a needle valve 2, an oil inlet pipe 3, and an oil return pipe 4.

The middle of the body 1 is provided with a fuel chamber 8, a metering chamber 5, an oil inlet passage 6 and an oil storage chamber 7, and the bottom of the body 1 is provided with an air inlet. The oil inlet pipe 3 is communicated to the oil storage chamber 7, the front end of the oil inlet passage 6 is communicated to the oil storage chamber 7, the rear end of the oil inlet passage 6 is communicated to the metering chamber 5, the needle valve 2 is arranged at the oil inlet passage 6 to control the on-off of the oil inlet passage 6, and the air inlet and the fuel oil chamber 8 are communicated to the metering chamber 5. The oil return pipe 4 is communicated to the part of the oil inlet passage 6 between the oil storage chamber 7 and the needle valve 2, so that after the needle valve 2 is disconnected from the oil inlet passage 6, the oil inlet pipe 3 and the oil return pipe 4 are both simultaneously disconnected from the metering chamber 5, and the fuel oil in the corresponding oil return pipe 4 cannot be sucked into the metering chamber 5.

The above description is only for the specific embodiments of the present invention, but the protection scope of the present invention is not limited thereto, and those skilled in the art should understand that the present invention includes but is not limited to the contents described in the drawings and the above specific embodiments. Any modification which does not depart from the functional and structural principles of the present invention is intended to be included within the scope of the claims.

Claims

1. The utility model provides a diaphragm type carburetor, its characterized in that, includes body, needle valve, advances oil pipe and returns oil pipe, and measurement room, oil feed route and oil storage room have been seted up to the centre of body, and the front end of oil feed route communicates to the oil storage room, and the rear end of oil feed route communicates to the measurement room, and the needle valve setting is in the break-make of oil feed route department in order to control the oil feed route, advances oil pipe and communicates to the oil storage room, returns oil pipe and communicates to the oil storage room or the part that the oil feed route is located between oil storage room and the.

2. The diaphragm carburetor according to claim 1, further comprising an oil inlet screen disposed at a front end of the oil inlet passage, the front end of the oil inlet passage communicating with the oil storage chamber through the oil inlet screen.

3. The diaphragm carburetor according to claim 1, wherein the body defines a fuel chamber in the middle thereof, and an air inlet opening is defined in the bottom thereof, the air inlet opening and the fuel chamber being connected to the metering chamber.

4. The diaphragm carburetor of claim 1, further comprising an upper cover and a lower cover, the upper cover covering the top opening of the oil reservoir chamber and the lower cover covering the bottom opening of the metering chamber.