CN215830609U - Normally closed negative pressure needle valve for carburetor and carburetor thereof - Google Patents
Normally closed negative pressure needle valve for carburetor and carburetor thereof Download PDFInfo
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- CN215830609U CN215830609U CN202121248697.6U CN202121248697U CN215830609U CN 215830609 U CN215830609 U CN 215830609U CN 202121248697 U CN202121248697 U CN 202121248697U CN 215830609 U CN215830609 U CN 215830609U
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Abstract
The utility model relates to a normally closed negative pressure needle valve for a carburetor and a carburetor thereof, wherein the normally closed negative pressure needle valve comprises an air chamber shell, a sealing needle, a diaphragm, a normally closed reset piece and an air chamber cover, the air chamber shell and the air chamber cover are fixed to form an air chamber, the front end of the sealing needle penetrates through the air chamber shell, the sealing needle can move back and forth to seal or open a liquid fuel inlet on an oil cup of the carburetor, the rear end of the sealing needle is connected with the diaphragm arranged in the air chamber, the diaphragm separates the air chamber into a first chamber and a second chamber which are not communicated with each other, the forward and backward swinging of the diaphragm can drive the sealing needle to move back and forth, the normally closed reset piece is arranged in the air chamber and is used for forcing the sealing needle to be in a normally closed state for sealing the liquid fuel inlet, and the second chamber is provided with a negative pressure connecting port. The normally closed negative pressure needle valve can achieve more excellent performance than a carburetor adopting an electromagnetic valve without adopting an external power supply, and has the advantages of lower manufacturing cost, simpler structure and better safety.
Description
Technical Field
The utility model relates to the technical field of carburettors, in particular to a normally closed negative pressure needle valve for a carburetor and the carburetor thereof.
Background
The carburetor is a mechanical device which mixes gasoline and air in a certain proportion under the action of vacuum generated by the operation of an engine. Most of carburetors on the market at present are provided with electromagnetic valves, after an engine is flamed out, the electromagnetic valves can completely close a main metering orifice immediately, the engine continues to run under the action of inertia to suck most of oil in an oil way, and before the engine is restarted, the engine and an air passage are in an oil-free or oil-less state, so that the hot start performance of the engine is influenced. In addition, the electromagnetic valve can work only by the power supply of the storage battery, and the electromagnetic valve is particularly inconvenient to use under the condition of no storage battery or under the condition of long distance of the storage battery. Moreover, the cost of the solenoid valve is relatively high. Based on the above problems, there is a need to develop a normally closed needle valve structure that does not require a solenoid valve but can bring more excellent effects than the solenoid valve.
SUMMERY OF THE UTILITY MODEL
Based on the defects of the prior art, the utility model provides the normally closed type negative pressure needle valve for the carburetor and the carburetor thereof, the normally closed type negative pressure needle valve can achieve more excellent performance than the carburetor adopting the electromagnetic valve without adopting an external power supply, and the normally closed type negative pressure needle valve has the advantages of lower manufacturing cost, simpler structure and better safety.
In order to achieve the purpose, the technical scheme of the utility model is as follows: a normally closed negative pressure needle valve for a carburetor comprises an air chamber shell, a sealing needle, a diaphragm, a normally closed reset piece and an air chamber cover, wherein the air chamber shell and the air chamber cover are fixed to form an air chamber, the front end of the sealing needle penetrates through the air chamber shell, the sealing needle can move back and forth to enable a liquid fuel inlet on a carburetor oil cup to be plugged or opened, the rear end of the sealing needle is connected with the diaphragm arranged in the air chamber, the diaphragm separates the air chamber into a first cavity and a second cavity which are not communicated with each other, the sealing needle can be driven to move back and forth by the back and forth swing of the diaphragm, the normally closed reset piece is arranged in the air chamber and used for forcing the sealing needle to be in a normally closed state for plugging the liquid fuel inlet, and the second cavity is provided with a negative pressure connecting port.
Preferably, the negative pressure inlet is communicated to the front end of a throttle valve sheet of the carburetor body through a negative pressure channel so as to introduce negative pressure. And the negative pressure channel is also provided with a pressure stabilizing one-way valve for stabilizing negative pressure.
Preferably, the negative pressure channel is formed on the carburetor body and the carburetor oil cup; or the negative pressure channel is an external connecting pipe, one end of the external connecting pipe is connected to the negative pressure access port of the second chamber, and the other end of the external connecting pipe is connected to the front end of the throttle valve sheet of the carburetor body so as to introduce negative pressure.
Preferably, the normally closed reset piece is a pressure spring, the pressure spring is installed in the second chamber, the front end of the pressure spring is abutted against or fixed to the diaphragm, and the rear end of the pressure spring is abutted against or fixed to the inner wall of the second chamber; or the normally closed reset piece is a tension spring, the tension spring is installed in the first cavity, the front end of the tension spring is fixed to the inner wall of the first cavity, and the rear end of the tension spring is fixed to the sealing needle or the diaphragm.
Preferably, the air chamber shell and the carburetor oil cup are of an integrally formed structure; or the air chamber shell and the carburetor oil cup are of a split structure.
The technical scheme of the utility model is as follows: a carburetor comprises a carburetor body and a carburetor cup, wherein the bottom of the carburetor cup is provided with a liquid fuel inlet which is communicated with a main quantity channel so as to supply liquid fuel in the carburetor cup to the carburetor body, the carburetor cup is also provided with a normally-closed negative pressure needle valve, the normally-closed negative pressure needle valve comprises an air chamber shell, a sealing needle, a diaphragm, a normally-closed reset piece and an air chamber cover, the air chamber shell is fixed with the air chamber cover to form an air chamber, the front end of the sealing needle penetrates through the air chamber shell, the sealing needle can move back and forth to seal or open the liquid fuel inlet on the carburetor cup, the rear end of the sealing needle is connected with the diaphragm arranged in the air chamber, the diaphragm separates the air chamber into a first chamber and a second chamber which are not communicated with each other, and the forward and backward swinging of the diaphragm can drive the sealing needle to move back and forth, the normally closed reset piece is arranged in the air chamber and used for forcing the sealing needle to be in a normally closed state for plugging the liquid fuel inlet, and the second chamber is provided with a negative pressure access port.
Preferably, the negative pressure inlet is communicated to the front end of a throttle valve sheet of the carburetor body through a negative pressure channel so as to introduce negative pressure.
Preferably, the negative pressure channel is formed on the carburetor body and the carburetor oil cup; or the negative pressure channel is an external connecting pipe, one end of the external connecting pipe is connected to the negative pressure access port of the second chamber, and the other end of the external connecting pipe is connected to the front end of the throttle valve sheet of the carburetor body so as to introduce negative pressure.
Preferably, the normally closed reset piece is a pressure spring, the pressure spring is installed in the second chamber, the front end of the pressure spring is abutted against or fixed to the diaphragm, and the rear end of the pressure spring is abutted against or fixed to the inner wall of the second chamber; or the normally closed reset piece is a tension spring, the tension spring is installed in the first cavity, the front end of the tension spring is fixed to the inner wall of the first cavity, and the rear end of the tension spring is fixed to the sealing needle or the diaphragm.
Preferably, the air chamber shell and the carburetor oil cup are of an integrally formed structure; or the air chamber shell and the carburetor oil cup are of a split structure.
Preferably, the oil cup is further provided with an overflow port, and the overflow port returns to the oil tank through a return pipe and a pump.
The utility model has the beneficial effects that: the utility model designs a novel normally closed negative pressure needle valve for improving and replacing the existing electromagnetic valve, which not only can obviously improve the performance of the carburetor, but also has lower manufacturing cost, simpler structure and better safety.
Drawings
FIG. 1 is a schematic sectional view of a normally closed negative pressure needle valve and a carburetor thereof in an embodiment.
FIG. 2 is a schematic sectional view of a carburetor according to an embodiment.
Description of reference numerals: 1-air chamber shell 1.1-first chamber 1.2-second chamber 2-sealing needle 3-diaphragm 4-normally closed reset piece 5-air chamber cover 5.1-negative pressure inlet 11-carburetor oil cup 12-liquid fuel inlet 13-negative pressure channel 13.1-pressure stabilizing one-way valve 14-carburetor body 15-main quantity channel 16-overflow port 17-return pipe 18-pump 19-oil tank.
Detailed Description
In order to make the technical content and the constructional characteristics of the utility model more easily understood by a person skilled in the art, the present application is further described with reference to the accompanying drawings and technical features.
Example 1
Referring to fig. 1 and 2, the normally closed negative pressure needle valve for carburetor of the present invention includes an air chamber housing 1, a sealing needle 2, a diaphragm 3, a normally closed reset member 4 and an air chamber cover 5, wherein the air chamber housing 1 and the air chamber cover 5 are fixed to form an air chamber, the front end of the sealing needle 2 is inserted into the air chamber housing 1, and the sealing needle 1 moves back and forth to close or open a liquid fuel inlet 12 on a carburetor cup 11, the rear end of the sealing needle 2 is connected to the diaphragm 3 disposed in the air chamber, the diaphragm 3 separates the air chamber into a first chamber 1.1 and a second chamber 1.2 which are not communicated with each other, and the forward and backward swing of the diaphragm 3 can drive the sealing needle to move back and forth, the normally closed reset member 4 is disposed in the air chamber to force the sealing needle 2 to be in a normally closed state of closing the liquid fuel inlet, the second chamber 1.2 is provided with a negative pressure inlet 5.1, the negative pressure inlet 5.1 is arranged on the air chamber cover 5, and the negative pressure inlet 5.1 is communicated to the front end of a throttle valve sheet of the carburetor body 14 through a negative pressure channel 13 so as to introduce negative pressure.
In the embodiment, the negative pressure channel 13 is formed on the side walls of the carburetor body and the carburetor cup, so that the structure is more compact and the manufacturing cost is lower. And a pressure stabilizing one-way valve 13.1 is also arranged on the negative pressure channel 13 and used for stabilizing negative pressure.
In other embodiments, the negative pressure channel 13 may also be an external pipe, one end of which is connected to the negative pressure inlet 5.1 of the second chamber 1.2, and the other end of which is connected to the front end of the throttle flap of the carburetor body 14, so as to introduce the negative pressure. And the external connecting pipe is also provided with a pressure stabilizing one-way valve for stabilizing negative pressure.
In this embodiment, the normally closed reset piece 4 is a pressure spring, and the pressure spring is installed in the second chamber, the front end of the pressure spring is inconsistent with or fixed to the diaphragm, and the rear end of the pressure spring is inconsistent with or fixed to the inner wall of the second chamber.
In other embodiments, the normally closed reset member may also be a tension spring, and the tension spring is installed in the first chamber, the front end of the tension spring is fixed to the inner wall of the first chamber, and the rear end of the tension spring is fixed to the sealing needle or the diaphragm.
In the embodiment, the air chamber shell 1 and the carburetor oil cup 11 are of an integrally formed structure;
in other embodiments, the air chamber housing 1 and the carburetor oil cup 11 may also be of a split structure, that is, the air chamber housing 1 is fixed to a corresponding mounting portion of the carburetor oil cup 11.
Example 2
Referring to fig. 1 and 2, the carburetor of the present invention includes a carburetor body 14 and a carburetor cup 13, the bottom of the carburetor cup 13 is provided with a liquid fuel inlet 12, the liquid fuel inlet 12 is communicated with a main volume passage 15 so as to supply the liquid fuel in the carburetor cup 13 to the carburetor body 14, the carburetor cup 13 is further provided with a normally closed negative pressure needle valve, which includes an air chamber housing 1, a seal needle 2, a diaphragm 3, a normally closed reset member 4 and an air chamber cover 5, the air chamber housing 1 is fixed with the air chamber cover 5 to form an air chamber, the front end of the seal needle 2 penetrates the air chamber housing 1, and the seal needle 1 moves back and forth to close or open the liquid fuel inlet 12 on the carburetor cup 11, the rear end of the seal needle 2 is connected with the diaphragm 3 arranged in the air chamber, the diaphragm 3 separates the air chamber into a first chamber 1.1 and a second chamber 1.2 which are not communicated with each other, the sealing needle can be driven to move back and forth by the forward and backward swing of the diaphragm 3, the normally closed reset piece 4 is arranged in the air chamber and used for forcing the sealing needle 2 to be in a normally closed state for plugging a liquid fuel inlet, the second chamber 1.2 is provided with a negative pressure inlet 5.1, the negative pressure inlet 5.1 is arranged on the air chamber cover 5, and the negative pressure inlet 5.1 is communicated to the front end of a throttle valve sheet of the carburetor body 14 through a negative pressure channel 13 so as to introduce negative pressure.
In the embodiment, the negative pressure channel 13 is formed on the side walls of the carburetor body and the carburetor cup, so that the structure is more compact and the manufacturing cost is lower. And a pressure stabilizing one-way valve 13.1 is also arranged on the negative pressure channel 13 and used for stabilizing negative pressure.
In other embodiments, the negative pressure channel 13 may also be an external pipe, one end of which is connected to the negative pressure inlet 5.1 of the second chamber 1.2, and the other end of which is connected to the front end of the throttle flap of the carburetor body 14, so as to introduce the negative pressure. And the external connecting pipe is also provided with a pressure stabilizing one-way valve for stabilizing negative pressure.
In this embodiment, the normally closed reset piece 4 is a pressure spring, and the pressure spring is installed in the second chamber, the front end of the pressure spring is inconsistent with or fixed to the diaphragm, and the rear end of the pressure spring is inconsistent with or fixed to the inner wall of the second chamber.
In other embodiments, the normally closed reset member may also be a tension spring, and the tension spring is installed in the first chamber, the front end of the tension spring is fixed to the inner wall of the first chamber, and the rear end of the tension spring is fixed to the sealing needle or the diaphragm.
In the embodiment, the air chamber shell 1 and the carburetor oil cup 11 are of an integrally formed structure;
in other embodiments, the air chamber housing 1 and the carburetor oil cup 11 may also be of a split structure, that is, the air chamber housing 1 is fixed to a corresponding mounting portion of the carburetor oil cup 11.
In this embodiment, the carburetor bowl 11 is further provided with an overflow port 16, and the overflow port 16 is returned to an oil tank 19 through a return pipe 17 and a pump 18.
The above description is only an embodiment of the present invention, and not intended to limit the scope of the present invention, and all modifications of equivalent structures and equivalent processes, which are made by using the contents of the present specification and the accompanying drawings, or directly or indirectly applied to other related technical fields, are included in the scope of the present invention.
Claims (10)
1. The utility model provides a carburetor is with normal close formula negative pressure needle valve, includes air chamber casing, sealing needle, diaphragm, normally closed piece and chamber cap that resets, the air chamber casing is fixed and forms the air chamber with the chamber cap, its characterized in that: the front end of the sealing needle penetrates through the air chamber shell, the front end of the sealing needle can move back and forth to enable a liquid fuel inlet on a carburetor oil cup to be plugged or opened, the rear end of the sealing needle is connected with a diaphragm arranged in the air chamber, the diaphragm separates the air chamber into a first chamber and a second chamber which are not communicated with each other, the sealing needle can be driven to move back and forth by the forward and backward swing of the diaphragm, the normally-closed reset piece is arranged in the air chamber and used for forcing the sealing needle to be in a normally-closed state for plugging the liquid fuel inlet, and the second chamber is provided with a negative pressure access port.
2. The normally closed negative pressure needle valve for the carburetor of claim 1, wherein: the negative pressure access port is communicated to the front end of a throttle valve sheet of the carburetor body through a negative pressure channel so as to introduce negative pressure, and the negative pressure channel is further provided with a pressure stabilizing one-way valve for stabilizing the negative pressure.
3. The normally closed negative pressure needle valve for the carburetor of claim 2, wherein: the negative pressure channel is arranged on the carburetor body and the carburetor oil cup; or the negative pressure channel is an external connecting pipe, one end of the external connecting pipe is connected to the negative pressure access port of the second chamber, and the other end of the external connecting pipe is connected to the front end of the throttle valve sheet of the carburetor body so as to introduce negative pressure.
4. The normally closed negative pressure needle valve for the carburetor of claim 1, wherein: the normally closed reset piece is a pressure spring, the pressure spring is arranged in the second chamber, the front end of the pressure spring is abutted against or fixed with the diaphragm, and the rear end of the pressure spring is abutted against or fixed with the inner wall of the second chamber; or the normally closed reset piece is a tension spring, the tension spring is installed in the first cavity, the front end of the tension spring is fixed to the inner wall of the first cavity, and the rear end of the tension spring is fixed to the sealing needle or the diaphragm.
5. The normally closed negative pressure needle valve for the carburetor of claim 1, wherein: the air chamber shell and the carburetor oil cup are of an integrally formed structure; or the air chamber shell and the carburetor oil cup are of a split structure.
6. A carburetor, comprising a carburetor body and a carburetor bowl, wherein a liquid fuel inlet is provided at the bottom of the carburetor bowl, the liquid fuel inlet is communicated with a main volume passage so as to supply liquid fuel in the bowl to the carburetor body, characterized in that: the carburetor oil cup is also provided with a normally closed type negative pressure needle valve, the normally closed type negative pressure needle valve comprises an air chamber shell, a sealing needle, a diaphragm, a normally closed reset piece and an air chamber cover, the air chamber shell and the air chamber cover are fixed to form an air chamber, the front end of the sealing needle penetrates through the air chamber shell, the sealing needle can move back and forth to enable a liquid fuel inlet on the carburetor oil cup to be plugged or opened, the rear end of the sealing needle is connected with the diaphragm arranged in the air chamber, the diaphragm separates the air chamber into a first chamber and a second chamber which are not communicated with each other, the forward and backward swinging of the diaphragm can drive the sealing needle to move back and forth, the normally closed reset piece is arranged in the air chamber and used for forcing the sealing needle to be in a normally closed state for plugging the liquid fuel inlet, the second chamber is provided with a negative pressure access port which is communicated to the front end of a throttle valve of the carburetor body through a negative pressure channel, so that a negative pressure is introduced.
7. A carburettor according to claim 6 wherein: the negative pressure channel is arranged on the carburetor body and the carburetor oil cup; or the negative pressure channel is an external connecting pipe, one end of the external connecting pipe is connected to the negative pressure access port of the second chamber, and the other end of the external connecting pipe is connected to the front end of the throttle valve sheet of the carburetor body so as to introduce negative pressure.
8. A carburettor according to claim 6 wherein: the normally closed reset piece is a pressure spring, the pressure spring is arranged in the second chamber, the front end of the pressure spring is abutted against or fixed with the diaphragm, and the rear end of the pressure spring is abutted against or fixed with the inner wall of the second chamber; or the normally closed reset piece is a tension spring, the tension spring is installed in the first cavity, the front end of the tension spring is fixed to the inner wall of the first cavity, and the rear end of the tension spring is fixed to the sealing needle or the diaphragm.
9. A carburettor according to claim 6 wherein: the air chamber shell and the carburetor oil cup are of an integrally formed structure; or the air chamber shell and the carburetor oil cup are of a split structure.
10. A carburettor according to claim 6 wherein: the oil cup is also provided with an overflow port which flows back to the oil tank through a return pipe and a pump.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202121248697.6U CN215830609U (en) | 2021-06-05 | 2021-06-05 | Normally closed negative pressure needle valve for carburetor and carburetor thereof |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202121248697.6U CN215830609U (en) | 2021-06-05 | 2021-06-05 | Normally closed negative pressure needle valve for carburetor and carburetor thereof |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN215830609U true CN215830609U (en) | 2022-02-15 |
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Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN202121248697.6U Active CN215830609U (en) | 2021-06-05 | 2021-06-05 | Normally closed negative pressure needle valve for carburetor and carburetor thereof |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN215830609U (en) |
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2021
- 2021-06-05 CN CN202121248697.6U patent/CN215830609U/en active Active
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