A diaphragm type carburetor suitable for high temperature conditions

Abstract

The present invention relates to the technical field of carburetors, and discloses a diaphragm carburetors suitable for use in high temperature conditions, wherein the heat insulator of the carburetors is provided with an oil storage chamber inside, and the metering system of the carburetors is far away from the upper body of the carburetors, so that the heat radiation generated when the engine is working cannot be transmitted to the heat insulator and the metering system, and the functions of the diaphragm pump and the metering system on the middle body will not be affected, thereby ensuring the normal operation of the engine. On the other hand, since there is a large oil storage space in the heat insulator, the fuel can be transferred through the oil storage chamber for a transition cycle, and the temperature in the oil storage chamber can also be taken away, so that the temperature of the fuel in the oil storage chamber is at a lower temperature, which can avoid the metering system from generating air blockage due to overheating and affecting the performance of the engine, and at the same time ensure that the metering system has enough fuel for the engine to start.

Description

Technical Field

[0001] The invention relates to the technical field of carburetors, in particular to a diaphragm type carburetors suitable for use in high temperature conditions. Background Art

[0002] The carburetor mixes a certain amount of fuel with air and provides the required mixed gas according to the requirements of the engine under various working conditions so that the engine can operate normally. In the diaphragm carburetor of the prior art, if the engine works at high temperature for a period of time, the surface temperature of the carburetor will rise. At this time, since the gasoline will evaporate at such a temperature, gasoline vapor will be generated in the carburetor, forming gas blockage and affecting the operation of the engine. The engine will show unstable operation or cannot start.

[0003] In order to solve the above problems, the prior art uses an oil pipe to connect the middle body and the upper body to separate the two to isolate the heat transfer. However, when the engine is started for the first time, the metering chamber of this carburetor lacks fuel or has little fuel, resulting in a poor engine start, which affects the use of the engine. Summary of the invention

[0004] The purpose of the present invention is to provide a diaphragm carburetor suitable for use under high temperature conditions, so as to solve the problem that when the engine is started for the first time, the metering chamber of the existing carburetor lacks fuel or has little fuel, resulting in an unsmooth engine start and affecting the use of the engine.

[0005] In order to solve the above problems, the present invention provides a diaphragm carburetor suitable for high temperature conditions, including a main body, a diaphragm pump and a metering system, the main body includes an upper body, an insulating body, a middle body and a lower body connected in sequence, the upper body is provided with a mixing chamber connected to the intake pipe of the engine, the insulating body is made of plastic material, and an oil storage cavity is provided in the insulating body.

[0006] Furthermore, a balance pipe connected to the oil pot is connected to the upper portion of the oil storage chamber, and the diaphragm pump and the metering system are arranged on the middle body. The diaphragm pump connects the oil pot with the oil storage chamber and the metering system and is used to pump the fuel in the oil pot to the oil storage chamber and the metering system. A fuel channel for transporting the fuel of the metering system to the mixing chamber is provided in the middle body and the heat insulation body, and a main nozzle connected to the mixing chamber is provided at the outlet of the fuel channel.

[0007] Furthermore, it also includes an oil inlet pipe, which is connected between the oil pot and the diaphragm pump.

[0008] Furthermore, a first one-way valve is provided between the diaphragm pump and the oil storage chamber, and the first one-way valve opens and closes toward the oil storage chamber.

[0009] Furthermore, the middle body is also provided with a pulse cavity and a pulse tube, and the diaphragm pump comprises a middle body sealing plate and an oil pump diaphragm, and a first tongue plate and a second tongue plate are provided on the oil pump diaphragm.

[0010] Furthermore, the metering system includes a metering cavity, a lower cover arranged at the lower end of the metering cavity, an oil-absorbing membrane located in the metering cavity, and a lower body sealing sheet arranged between the lower body and the middle body.

[0011] Furthermore, a connecting cavity communicating with the oil storage cavity is provided at the lower end of the upper body, and the connecting cavity is communicated with the balancing pipe.

[0012] Furthermore, an oil pump ball is provided at the lower end of the lower cover, and the oil pump ball is connected to the oil pot through an oil circuit.

[0013] Furthermore, a second one-way valve is provided between the communicating cavity and the balancing pipe, and the second one-way valve opens and closes toward the balancing pipe.

[0014] The present invention provides a diaphragm carburetor suitable for use in high-temperature conditions, wherein the upper body is connected to the engine, the mixing chamber is butted against the intake pipe of the engine, the heat radiation generated when the engine is working can only be transferred to the upper body of the carburetor, and the heat insulation body of the carburetor is made of a plastic material with poor heat conductivity and is provided with an oil storage chamber inside, the metering system of the carburetor is far away from the upper body of the carburetor, the heat radiation generated when the engine is working cannot be transferred to the heat insulation body and the metering system, so that the functions of the diaphragm pump and the metering system on the middle body will not be affected, and even if some radiation is transferred, the temperature will not rise to above 60°C to generate air resistance and affect the normal operation of the engine. On the other hand, since there is a large oil storage space in the insulation body, when the carburetor is working normally, part of the fuel pumped from the oil pot by the diaphragm pump enters the metering system for engine combustion, and the other part of the excess fuel enters the oil storage chamber, and then passes through the oil storage chamber through the balance pipe and flows into the oil pot of the engine. The fuel passes through the oil storage chamber for transit and transition circulation, which can also take away the temperature in the oil storage chamber, so that the temperature of the fuel in the oil storage chamber is at a lower temperature, which can not only avoid the metering system from overheating and causing air blockage to affect the performance of the engine, but also ensure that the metering system has enough fuel for the engine to start. BRIEF DESCRIPTION OF THE DRAWINGS

[0015] Figure 1 It is a schematic structural diagram of a diaphragm type carburetor suitable for use under high temperature conditions in the first embodiment of the present invention.

[0016] Figure 2 It is a structural schematic diagram of another perspective of the diaphragm type carburetor suitable for high temperature conditions in the first embodiment of the present invention.

[0017] Figure 3 It is a structural schematic diagram of another perspective of the diaphragm type carburetor suitable for high temperature conditions in the first embodiment of the present invention.

[0018] Figure 4 yes Figure 1 AA section view.

[0019] Figure 5 yes Figure 3 BB cross-sectional view.

[0020] Figure 6 It is a schematic diagram of the working oil circuit of the first embodiment.

[0021] Figure 7 It is a structural schematic diagram of another perspective of the diaphragm type carburetor suitable for high temperature conditions in the second embodiment of the present invention.

[0022] Figure 8 It is a schematic structural diagram of a diaphragm type carburetor suitable for use under high temperature conditions in the second embodiment of the present invention.

[0023] Fig. 9 It is a schematic diagram of the structure of the heat insulator in the second embodiment.

[0024] Fig.10 It is a schematic diagram of the working oil circuit of the second embodiment.

[0025] In the figure, 1, main body; 2, diaphragm pump; 3, metering system; 4, oil pump ball; 101, upper body; 102, heat insulation body; 103, middle body; 104, lower body; 105, air inlet; 106, mixing chamber; 107, oil storage chamber; 108, balance pipe; 109, fuel channel; 110, main nozzle; 111, oil inlet pipe; 112, first one-way valve; 113, pulse chamber; 114, pulse tube; 115, connecting chamber; 116, second one-way valve; 201, middle body sealing plate; 202, oil pump diaphragm; 203, first tongue plate; 204, second tongue plate; 301, metering chamber; 302, lower cover; 303, oil absorption diaphragm; 304, lower body sealing plate. DETAILED DESCRIPTION

[0026] The specific implementation of the present invention is further described in detail below in conjunction with the accompanying drawings and examples. The following examples are used to illustrate the present invention, but are not intended to limit the scope of the present invention.

[0027] In the description of the present invention, it is necessary to understand that the orientations or positional relationships indicated by terms such as “upper”, “lower”, “left”, “right”, “top” and “bottom” are based on the orientations or positional relationships shown in the accompanying drawings and are only for the convenience of describing the present invention and simplifying the description. They do not indicate or imply that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and therefore cannot be understood as a limitation on the present invention.

[0028] Embodiment 1:

[0029] Combination Figures 1 to 6 As shown, a diaphragm carburetor suitable for high temperature conditions according to an embodiment of the present invention is schematically shown, comprising a main body 1, a diaphragm pump 2 and a metering system 3. It should be noted that the diaphragm pump 2 and the metering system 3 in this embodiment both adopt the diaphragm pump 2 and the metering system 3 of the existing carburetor, and this embodiment does not involve any improvement to the structure of the diaphragm pump 2 and the metering system 3. The main body 1 comprises an upper body 101, a heat insulating body 102, a middle body 103 and a lower body 104 connected in sequence. The upper body 101, the heat insulating body 102, the middle body 103 and the lower body 104 are fixed together by screws to form a whole. The oil supply generated by the diaphragm pump 2 and the metering system 3 is sprayed from the main nozzle 110 through a fuel channel 109 to supply oil to the carburetor main body 1. The upper body 101 is provided with a fuel oil pump 109 and a fuel oil pump 109. A mixing chamber 106 connected to the intake pipe of the engine and an air inlet 105 for taking in air, the fuel and air are mixed in the mixing chamber 106 and supplied to the engine, the preferred heat insulator 102 is made of plastic material, and an oil storage chamber 107 is provided in the heat insulator 102, the upper part of the oil storage chamber 107 is connected to a balance pipe 108 connected to the oil pot, the diaphragm pump 2 and the metering system 3 are arranged on the middle body 103, the diaphragm pump 2 connects the oil pot with the oil storage chamber 107 and the metering system 3, and is used to pump the fuel in the oil pot to the oil storage chamber 107 and the metering system 3, the middle body 103 and the heat insulator 102 are provided with a fuel channel 109 for transporting the fuel of the metering system 3 to the mixing chamber 106, and a main nozzle 110 connected to the mixing chamber 106 is provided at the outlet of the fuel channel 109.

[0030] Specifically, the upper body 101 is connected to the engine, and the mixing chamber 106 is connected to the intake pipe of the engine. The heat radiation generated when the engine is working can only be transferred to the upper body 101 of the carburetor, and the heat insulation body 102 of the carburetor is made of a plastic material with poor heat conductivity and an oil storage chamber 107 is provided inside. The metering system 3 of the carburetor is far away from the upper body 101 of the carburetor. The heat radiation generated when the engine is working cannot be transmitted to the heat insulation body 102 and the metering system 3. In this way, the functions of the diaphragm pump 2 and the metering system 3 on the middle body 103 will not be affected. Even if some radiation is transmitted, the temperature will not rise above 60°C to cause air blockage and affect the normal operation of the engine. On the other hand, since there is a large oil storage space in the insulator 102, when the carburetor is working normally, part of the fuel pumped from the oil pot by the diaphragm pump 2 enters the metering system 3 for engine combustion, and the other part of the excess fuel enters the oil storage chamber 107, and then flows into the oil pot of the engine from the balance pipe 108 through the oil storage chamber 107. The fuel passes through the oil storage chamber 107 for a transit cycle and can also take away the temperature in the oil storage chamber 107, so that the temperature of the fuel in the oil storage chamber 107 is at a lower temperature.

[0031] The diaphragm carburetor suitable for high temperature conditions in this embodiment also includes an oil inlet pipe 111, which is connected between the oil pot and the diaphragm pump 2. Under the action of the diaphragm pump 2, the fuel is pumped from the oil pot into the metering system 3 and the oil storage chamber 107 through the oil inlet pipe 111.

[0032] Furthermore, if Figure 5 As shown, a first one-way valve 112 is provided between the diaphragm pump 2 and the oil storage chamber 107. The first one-way valve 112 opens and closes toward the oil storage chamber 107. By providing the first one-way valve 112, it is ensured that the fuel can only be transported from the oil inlet pipe 111 to the oil storage chamber 107 through the diaphragm pump 2 and cannot flow in the reverse direction, thereby ensuring the circulation of the fuel in the oil storage chamber 107 to realize heat exchange of the oil storage chamber 107.

[0033] The middle body 103 in this embodiment is also provided with a pulse chamber 113 and a pulse tube 114, the diaphragm pump 2 includes a middle body sealing sheet 201 and an oil pumping diaphragm 202, a first tongue 203 and a second tongue 204 are provided on the oil pumping diaphragm 202, and the metering system 3 includes a metering chamber 301, a lower cover 302 provided at the lower end of the metering chamber 301, an oil absorbing diaphragm 303 located in the metering chamber 301, and a lower body sealing sheet 304 provided between the lower body 104 and the middle body 103. The specific oil circuit during operation is as follows:

[0034] like Figure 4 , Figure 5 , Figure 6 As shown, when the engine is working, the pulse generated by the engine is introduced into the pulse chamber 113 of the carburetor through the pulse tube 114, pushing the pump oil membrane 202 in the pulse chamber 113 to move up and down, thereby pushing the first tongue 203 and the second tongue 204 to move alternately, thereby generating suction to suck the fuel out of the oil pot and from the oil inlet pipe 111, along the Figure 7 The oil circuit shown in abcde is sucked, and part of the fuel is sucked into the metering chamber 301 of the carburetor, and the other part of the fuel enters the oil storage chamber 107 through the first one-way valve 112. The fuel in the metering chamber 301 is then ejected from the main nozzle 110 at the fuel channel 109, and is mixed with the air entering from the air inlet 105 in the mixing chamber 106 to form a mixed gas, and then flows into the engine from the mixing chamber 106 on the main body to provide the engine with combustion work and output power to the outside.

[0035] A connecting cavity 115 connected to the oil storage cavity 107 is provided at the lower end of the upper body 101. The connecting cavity 115 connects the oil storage cavity 107 with the balance pipe 108 to facilitate the return of excess fuel in the oil storage cavity 107 to the oil pot. At the same time, since the oil storage cavity 107 is filled with a portion of fuel and the oil pot of the carburetor is higher than the carburetor, before the engine works, the fuel is supplied from the oil pot to the oil storage chamber of the carburetor by its own weight, so that the oil storage chamber is filled with fuel. When the engine is started, the fuel can easily enter the metering chamber of the carburetor, so the engine is easy to start.

[0036] Embodiment 2:

[0037] Reference Figure 7 to Figure 10 As shown, the difference between this embodiment and the first embodiment is that a pump ball 4 is provided at the lower end of the lower cover 302, and the pump ball 4 is connected to an oil pot through an oil path, and a second one-way valve 116 is provided between the connecting cavity 115 and the balance pipe 108, and the second one-way valve 116 opens and closes toward the balance pipe 108. The function of the pump ball 4 is: before the engine is started, the pump ball 4 is squeezed by hand, and since the pump ball 4 is deformed during squeezing, a vacuum suction force is generated to suck the fuel out of the oil pot, and the fuel is sucked out from the oil pot. Fig.10 The fuel enters the oil inlet pipe 111 in a (or b) and passes through the oil circuit 1 to the metering chamber 301 of c, d, and e, and then passes through the oil pump ball 4 of f to g along the oil circuit 2. Finally, the fuel returns to the oil pot from the return pipe of g. Through the above process, the fuel is sucked from the oil pot into the carburetor metering chamber 301 before the engine is started. At the same time, the air in the carburetor metering chamber 301 is also discharged, which reduces the number of engine starts and improves the starting performance of the engine. By setting the second one-way valve 116, when the pump oil ball 4 is squeezed to suck oil, the second one-way valve 116 closes and cuts off the passage between the connecting chamber 115 and the balance pipe 108, ensuring that the oil can be smoothly sucked from the oil pot when the pump oil ball 4 is squeezed.

[0038] It should be understood that the present invention uses the terms "first", "second", etc. to describe various information, but these information should not be limited to these terms, and these terms are only used to distinguish the same type of information from each other. For example, without departing from the scope of the present invention, "first" information may also be referred to as "second" information, and similarly, "second" information may also be referred to as "first" information.

[0039] The above are only preferred embodiments of the present invention. It should be pointed out that, for ordinary technicians in this technical field, several improvements and substitutions can be made without departing from the technical principles of the present invention. These improvements and substitutions should also be regarded as the scope of protection of the present invention.

Claims

1. A diaphragm type carburetor suitable for use under high temperature conditions, characterized in that: It includes a main body, a diaphragm pump and a metering system. The main body includes an upper body, a heat-insulating body, a middle body and a lower body connected in sequence. The upper body is provided with a mixing chamber connected to the air intake pipe of the engine, and the heat-insulating body is provided with an oil storage cavity. The upper part of the oil storage chamber is connected with a balance pipe connected with the oil pot. The diaphragm pump and the metering system are arranged on the middle body. The diaphragm pump connects the oil pot with the oil storage chamber and the metering system and is used to pump the fuel in the oil pot to the oil storage chamber and the metering system. A first one-way valve is arranged between the diaphragm pump and the oil storage chamber, and the first one-way valve opens and closes toward the oil storage chamber. When the carburetor is working normally, part of the fuel pumped from the oil pot by the diaphragm pump enters the metering system for engine combustion, and another part of the excess fuel enters the oil storage chamber, and then flows into the oil pot from the balance pipe through the oil storage chamber. The fuel passes through the oil storage chamber for a transit transition cycle to take away the temperature in the oil storage chamber. A fuel channel for conveying the fuel of the metering system to the mixing chamber is provided in the middle body and the heat insulating body, and a main nozzle communicating with the mixing chamber is provided at the outlet of the fuel channel; The lower end of the upper body is provided with a communication cavity communicating with the oil storage cavity, and the communication cavity is communicated with the balance pipe; A second one-way valve is provided between the communication cavity and the balance pipe, and the second one-way valve opens and closes toward the balance pipe.

2. The diaphragm type carburetor suitable for use under high temperature conditions as claimed in claim 1, characterized in that: It also includes an oil inlet pipe, which is connected between the oil pot and the diaphragm pump.

3. The diaphragm type carburetor suitable for use under high temperature conditions as claimed in claim 1, characterized in that: The middle body is also provided with a pulse cavity and a pulse tube. The diaphragm pump comprises a middle body sealing sheet and an oil pumping diaphragm. A first tongue sheet and a second tongue sheet are provided on the oil pumping diaphragm.

4. The diaphragm type carburetor suitable for use under high temperature conditions as claimed in claim 1, characterized in that: The metering system comprises a metering cavity, a lower cover arranged at the lower end of the metering cavity, an oil absorbing membrane located in the metering cavity, and a lower body sealing sheet arranged between the lower body and the middle body.

5. The diaphragm type carburetor suitable for use under high temperature conditions as claimed in claim 4, characterized in that: An oil pump ball is provided at the lower end of the lower cover, and the oil pump ball is connected to the oil pot through an oil circuit.

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