The present disclosure relates to the field of carburetor, in particular to a fuel enrichment simple starting device of carburetor, an engine starting system and method thereof.
When an engine is in a warm state, a ratio of air and fuel in the economy is in a range of 13:1-15:1 set by the factory. But when the engine starts in a cold state, the ratio of air and fuel needs to be in a higher range of 6:1-12:1 because the carburetor needs to provide additional fuel to the engine to ensure that the engine can start normally.
At present, a choke device is widely used to reduce the amount of air to achieve a high air-fuel ratio. An engine starting method usually includes the following steps: step (1), squeezing the purge bulb; step (2), closing the choke; step (3), opening the throttle fully or setting the throttle in the fast idle speed position; step (4), pulling an engine starter until a POP sound is generated; step (5), pulling the choke to a one-half open position; step (6), pulling the engine starter to start the engine; step (7), keeping the engine running warm; step (8), pulling the choke to a full open position; and step (9), increasing and decreasing the throttle to normal running. The disadvantages of the present choke device are as follows: firstly, steps are cumbersome; secondly, it is difficult to judge the POP sound, resulting in difficulty starting the engine; and thirdly, the engine is difficult to or cannot start at low temperature (such as 0 degree centigrade).
An embodiment of the present disclosure includes a fuel enrichment simple starting device for a carburetor including a main body and a fuel cup disposed on the main body. The main body includes a mixing room, a metering room and a fuel chamber. The main body further includes a fuel pump diaphragm located in the fuel chamber and configured for separating the fuel chamber into a fuel pumping chamber and a fuel enrichment chamber. The main body further includes a fuel inputting passage, a fuel passage, a starting passage and a fuel returning passage.
The fuel pumping chamber is in communication with the fuel cup, and the fuel enrichment chamber is in communication with the fuel cup through the fuel passage. One end of the fuel inputting passage is in communication with the fuel enrichment chamber, and the other end of the fuel inputting passage is in communication with the metering room. One end of the starting passage is in communication with the fuel enrichment chamber, and the other end of the starting passage is in communication with the mixing room. One end of the fuel returning passage is in communication with the fuel cup, and the other end of the fuel returning passage is in communication with a fuel tank.
Furthermore, a first retaining valve is located in the fuel inputting passage and configured to prevent fuel in the fuel enrichment chamber from returning to the metering room.
Furthermore, a second retaining valve is located in the starting passage and configured to prevent fuel and air in the mixing room from returning to the fuel enrichment chamber.
Furthermore, a duckbill valve is disposed in the fuel returning passage, the fuel passage and the fuel returning passage are separated by the duckbill valve, and fuel in the fuel cup returns to the fuel tank through the duckbill valve and the fuel returning passage.
Furthermore, the main body further includes a pump transferring passage, one end of the pump transferring passage is in communication with the fuel cup, and the other end of the pump transferring passage is in communication with the fuel pumping chamber. A positive pressure generated by pressing the fuel cup is transmitted to the fuel pumping chamber through the pump transferring passage to drive the fuel pump diaphragm to vibrate.
Furthermore, the main body further includes a pressure balancing passage. One end of the pressure balancing passage is in communication with the starting passage, and the other end of the pressure balancing passage is in communication with the atmosphere.
Furthermore, the main body further includes a choke configured for controlling a ratio of air entering the mixing room.
A starting system of an engine including an engine and the fuel enrichment simple starting device of carburetor is provided. The fuel enrichment simple starting device of carburetor is connected with the engine.
A starting method of an engine including the fuel enrichment simple starting device for a carburetor includes: pressing the fuel cup, generating and transmitting a positive pressure to the fuel pumping chamber, and driving the fuel pump diaphragm to vibrate, resulting in injection of part of the fuel in the fuel enrichment chamber into the mixing room through the starting passage; and pulling an engine starter until the engine starts.
Furthermore, the step of the pressing the fuel cup further includes: pressing the fuel cup and at the same time, part of the fuel in the fuel cup returns to the fuel tank through the fuel returning passage; releasing the fuel cup, generating a negative pressure, sucking fuel in the metering room into the fuel enrichment chamber through the fuel inputting passage, and at the same time, sucking part of the fuel in the fuel enrichment chamber into the fuel cup through the fuel passage.
Furthermore, a first retaining valve is disposed in the fuel inputting passage, a second retaining valve is disposed in the starting passage, in the step of pressing the fuel cup, the first retaining valve is closed and the second retaining valve is opened.
Furthermore, in the step of releasing the fuel cup, the first retaining valve is opened and the second retaining valve is closed.
Furthermore, the starting method of the engine includes closing the choke after pressing the fuel cup and before the step of pulling the engine starter.
The fuel enrichment simple starting device for a carburetor according to the present disclosure has many advantages. The fuel enrichment simple starting device for a carburetor includes the fuel cup, the fuel inputting passage, the fuel passage, the starting passage and the fuel returning passage. When pressing the fuel cup, a positive pressure is generated and transmitted to the fuel pumping chamber, and the fuel pump diaphragm is driven to move, resulting in the injection of part of the fuel in the fuel enrichment chamber into the mixing room through the starting passage for starting the engine. At the same time, part of the fuel in the fuel cup returns to the fuel tank through the fuel returning passage. When releasing the fuel cup, a negative pressure is generated, fuel in the metering room is sucked into the fuel enrichment chamber through the fuel inputting passage, and at the same time, part of the fuel in the fuel enrichment chamber is sucked into the fuel cup through the fuel passage. It can be concluded that, the metering room, the fuel inputting passage, the fuel enrichment chamber, the fuel passage, the fuel cup, and the fuel returning passage can form an air and fuel clearing passage to remove excess air in the main body. The metering room, the fuel inputting passage, the fuel enrichment chamber, the starting passage, and the mixing room can form a fuel injecting passage. When pressing the fuel cup, the excess air in the main body will be removed, and at the same time, the part of fuel in the fuel enrichment chamber can be injected into the mixing room. As a result, the ratio of air and fuel can be increased, making the engine easier and more convenient to start. The fuel enrichment simple starting device for a carburetor is not only simple, but also easier to operate and start at a low temperature, resulting in a reduction of attempts to start the engine and obtaining higher efficiency.
The present disclosure will be further described in detail below with reference to the drawings and specific embodiments, in order to better understand the objective, the technical solution and the advantage of the present disclosure. It should be understood that the specific embodiments described herein are merely illustrative and are not intended to limit the scope of the disclosure.
It should be noted that when an element is referred to as being “fixed” to another element, it may be directly attached to the other element or a further element may be presented between them. When an element is considered to be “connected” to another element, it may be directly connected to the other element or connected to the other element through a further element (e.g., indirectly connected). The terms as used herein “vertical”, “horizontal”, “left”, “right”, and the like, are for illustrative purposes only and are not meant to be the only orientation.
Unless otherwise defined, all technical and scientific terms used herein have the same meaning as a skilled person in the art would understand. The terminology used in the description of the present disclosure is for the purpose of describing particular embodiments and is not intended to limit the disclosure.
Referring to
The starting system 200 of the engine includes an engine 201 and a fuel enrichment simple starting device for a carburetor 100 connected with the engine 201. The fuel enrichment simple starting device 100 is configured for providing fuel for the engine 201 before the engine 201 starts, resulting in reducing the number of engine starts and obtaining higher efficiency. In one embodiment, the engine 201 is easier to start at a low temperature, such as in a range of −15 degree centigrade to 5 degree centigrade.
The fuel enrichment simple starting device 100 can be applied in both a rotary valve type carburetor and a butterfly valve carburetor. Of course, the working principles of the fuel enrichment simple starting device 100 in either the rotary valve type carburetor or the butterfly valve carburetor are basically the same, with the difference being the location of the oil path. In the present disclosure, a butterfly valve carburetor is provided, and structure and working principle of the fuel enrichment simple starting device 100 are illustrated.
Referring to
The fuel pump diaphragm 11 can be made of plastic, rubber or other material. The fuel pump diaphragm 11 can be a flat plate and can vibrate back and forth when the fuel cup 20 is pressed and released. The fuel cup 20 is able to deform when it is pressed. The fuel cup 20 can be made of flexible plastic, rubber and so on.
Of course, besides the main body 10 and the fuel cup 20, the fuel enrichment simple starting device 100 further includes a throttle assembly, a choke assembly, and a linkage assembly, which cooperate to achieve overall function of the fuel enrichment simple starting device 100. It can be understood that, in this embodiment, the throttle assembly, the choke assembly, and the linkage assembly are understood in the art and so are not described herein.
Referring to
When pressing the fuel cup 20, a positive pressure can be generated and transmitted to the fuel pumping chamber 14a. Under the positive pressure, the fuel pump diaphragm 11 can be driven to vibrate, resulting in part of fuel in the fuel enrichment chamber 14b injecting into the mixing room 12 through the starting passage 17 and the engine 201 starts. Part of the fuel in the fuel cup 20 can return to the fuel tank 202 through the fuel returning passage 18.
When releasing the fuel cup 20, a negative pressure can be generated. Fuel in the fuel tank 202 can be sucked into the metering room 13. Fuel in the metering room 13 can be sucked into the fuel enrichment chamber 14b through the fuel inputting passage 15. And at the same time, part of the fuel in the fuel enrichment chamber 14b can be sucked into the fuel cup 20 through the fuel passage 16.
It can be concluded that, the metering room 13, the fuel inputting passage 15, the fuel enrichment chamber 14b, the fuel passage 16, the fuel cup 20, and the fuel returning passage 18 can form an air and fuel clearing passage to remove excess air in the main body 10. The metering room 13, the fuel inputting passage 15, the fuel enrichment chamber 14b, the starting passage 17, and the mixing room 12 can form a fuel injecting passage, which can provide fuel for the engine 201. When pressing the fuel cup 20, the excess air in the main body will be removed, and at the same time, the part of fuel in the fuel enrichment chamber 14b can be injected into the mixing room 12. Then the ratio of air and fuel can be increased, resulting in making the engine 201 start easier and more conveniently. The fuel enrichment simple starting device 100 of carburetor is not only simple, but also easier to operate and start at a low temperature, resulting in reducing number of starting times of the engine 201 and obtaining higher efficiency.
Referring to
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The first retaining valve 151 can be a check valve with or without a spring. In one embodiment, the first retaining valve 151 is the check valve without the spring. As referring to
Referring to
The second retaining valve 171 can be a check valve with or without a spring. In one embodiment, the second retaining valve 171 is the check valve with the spring.
Referring to
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The duckbill valve 181 can include a main valve part 181a and an umbrella part 181b connected with the main valve part 181a. The main valve part 181a can be mounted in the fuel returning passage 18 and able to open when pressing the fuel cup 20 and close when releasing the fuel cup 20. The umbrella part 181b is disposed at an inlet of the fuel passage 16, and the umbrella part 181b seals the fuel passage 16 to separate the fuel returning passage 18 from the fuel passage 16. The umbrella part 181b can be elastic and can be deformable.
The duckbill valve 181 can be deformable and made of flexible plastic, rubber or other material.
When pressing the fuel cup 20, under the positive pressure in the fuel cup 20, the main valve part 181a is opened, the fuel in the fuel cup 20 can return to the fuel tank 202 through the fuel returning passage 18; at the same time, the inlet of the fuel passage 16 is closed and the fuel passage 16 is sealed. When releasing the fuel cup 20, under the negative pressure formed in the fuel cup 20, the main valve part 181a is closed; at the same time, the umbrella part 181b is lifted, the inlet of the fuel passage 16 is open and the fuel in the fuel enrichment chamber 14b flows into the fuel cup 20 through the fuel passage 16.
It can be understood that, pressing and releasing the fuel cup 20 repeatedly can form a continuous positive and negative pressure, so that the pump oil diaphragm 11 is driven to reciprocate; that is, the pump is formed. The fuel in the metering room 13 can flow to the fuel enrichment chamber 14b, and the fuel in the fuel enrichment chamber 14b can be further pumped into the starting passage 17 and enter the mixing room 12. The fuel in the fuel enrichment chamber 14b can partially enter the fuel cup 20 through the fuel passage 16 and the fuel in the fuel cup 20 can return to the fuel tank 202 through the fuel returning passage 18.
When the fuel cup 20 is pressed, the second retaining valve 171 is opened, and the fuel in the fuel enrichment chamber 14b injects into the mixing room 12 through the starting passage 17. At the same time, the first retaining valve 151 in the fuel inputting passage 15 and the third retaining valve 161 in the fuel passage 16 are closed. When releasing the fuel cup 20, the first retaining valve 151 and the third retaining valve 161 are opened, the fuel in the metering room 13 enters into the fuel enrichment chamber 14b through the fuel inputting passage 15, and part of the fuel in the fuel enrichment chamber 14b enters into the fuel cup 20 through the fuel passage 16. At the same time, the second retaining valve 171 is closed, resulting in the fuel enrichment chamber 14b is filled with the fuel which will inject into the mixing room 12 subsequently.
Referring to
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The pump oil diaphragm 11 seals and isolates the first chamber 33 and the second chamber 41, respectively, so that the first chamber 33 forms the pump oil chamber 14a, and the second chamber 41 forms the oil-rich chamber 14b, which supplies for normal operation of the engine 201.
Referring to
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The retaining member 46 can be a check valve or other assembly having a non-return function.
Further, the pressure balancing passage 45 is located on the base 40, and the retaining member 46 is mounted at one end of the pressure balancing passage 45, which is in communication with the atmosphere.
Referring to
In one embodiment, the choke 50 is a choke with high air flow. The choke 50 has a plate with small area, and air intake amount increases. The size of plate of the choke 50 depends on the size of the engine 201. The air intake amount will increase when the engine 201 is started. Compared with the prior art, the user does not need to manually open the choke to the one-half position to achieve the pre-heating of the engine 201.
The working principle of the fuel enrichment simple starting device 100 of carburetor is as follow.
Before the engine 201 starts, the fuel cup 20 is pressed and released repeatedly. When pressing the fuel cup 20, a positive pressure can be generated and transmitted to the fuel pumping chamber 14a. Under the positive pressure, the fuel pump diaphragm 11 can be driven to vibrate, resulting in part of fuel in the fuel enrichment chamber 14b injecting into the mixing room 12 through the starting passage 17 and the engine 201 starts. Part of the fuel in the fuel cup 20 can return to the fuel tank 202 through the fuel returning passage 18. When releasing the fuel cup 20, a negative pressure can be generated. Fuel in the fuel tank 202 can be sucked into the metering room 13. Fuel in the metering room 13 can be sucked into the fuel enrichment chamber 14b through the fuel inputting passage 15. And at the same time, part of the fuel in the fuel enrichment chamber 14b can be sucked into the fuel cup 20 through the fuel passage 16.
After the engine 201 starts, the fuel cup 20 is not pressed. The crank case of the engine 201 will send a pulse to the pulse fuel chamber 34, resulting in the fuel pump diaphragm 11 vibrates, the fuel in the fuel tank 202 enters into the pulse pump chamber 42, then to the metering room 13, and finally to the mixing room 12.
Referring to
S1, pressing the fuel cup 20, the positive pressure is generated and transmitted to the fuel pumping chamber 14a, and the fuel pump diaphragm 11 is driven to vibrate, resulting in part of fuel in the fuel enrichment chamber 14b injecting into the mixing room 12 through the starting passage 17, and at the same time, part of the fuel in the fuel cup 20 returns to the fuel tank 202 through the fuel returning passage 18;
S2, releasing the fuel cup 20, the negative pressure is generated, fuel in the metering room 13 is sucked into the fuel enrichment chamber 14b through the fuel inputting passage 15, and at the same time, part of the fuel in the fuel enrichment chamber 14b is sucked into the fuel cup 20 through the fuel passage 16; and
S3, pulling an engine starter until the engine starts.
Furthermore, in step of S1, the first retaining valve 151 is closed and the second retaining valve 171 is opened. The fuel in the fuel enrichment chamber 14b can flow to the mixing room 12, but cannot return to the metering room 13.
In S2, the first retaining valve 151 is opened and the second retaining valve 171 is closed. The fuel in the metering room 13 can flow into the fuel enrichment chamber 14b through the fuel inputting passage 15. The fuel in the mixing room 12 cannot return to the fuel enrichment chamber 14b through the starting passage 17.
In a step S3, the engine starter can be pulled manually or by a power mechanism driving mode. In the present embodiment, the engine starter is manually pulled.
The starting method can further include a step of closing the choke after the step of pressing the fuel cup and before the step of pulling the engine starter.
The technical features of the above-described embodiments may be combined in any combination. For the sake of brevity of description, all possible combinations of the technical features in the above embodiments are not described. However, as long as there is no contradiction between the combinations of these technical features, all should be considered as the scope of this disclosure.
The above-described embodiments are merely illustrative of several embodiments of the present disclosure, and the description thereof is relatively specific and detailed, but is not to be construed as limiting the scope of the disclosure. It should be noted that a number of variations and modifications may be made by those skilled in the art without departing from the spirit and scope of the disclosure. Therefore, the scope of the disclosure should be determined by the appended claims.
Number | Date | Country | Kind |
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2016 1 0925134 | Oct 2016 | CN | national |
2019 1 0340481 | Apr 2019 | CN | national |
2019 2 0581914 U | Apr 2019 | CN | national |
This application claims all benefits accruing under 35 U.S.C. § 119 from China Patent Application Nos. 201920581914.X, filed on Apr. 25, 2019, and 201910340481.3, filed on Apr. 25, 2019, in the State Intellectual Property Office of China, the content of which is hereby incorporated by reference. This application is also a continuation-in-part of U.S. patent application Ser. No. 15/417,040 filed on Jan. 26, 2017, which claims all benefits accruing under 35 U.S.C. § 119 from China Patent Application No. 201610925134.3, filed on Oct. 30, 2016, and the content of which is also hereby incorporated by reference.
Number | Name | Date | Kind |
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20020135082 | Woody | Sep 2002 | A1 |
20080135018 | Keeton | Jun 2008 | A1 |
20120318249 | Warfel | Dec 2012 | A1 |
Number | Date | Country | |
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20190264638 A1 | Aug 2019 | US |
Number | Date | Country | |
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Parent | 15417040 | Jan 2017 | US |
Child | 16407181 | US |