Fuel gas-fuel oil automatic switching system

Abstract

The utility model relates to a fuel gas-fuel oil automatic switching system which comprises a fuel gas source, a fuel oil source, a pressure reducing valve and a carburetor, the fuel oil source is connected with the carburetor through an oil pipe, and a fuel oil channel is formed in the carburetor. The gas source is connected with the pressure reducing valve through a first gas pipe. The pressure reducing valve is connected with the carburetor through a second gas pipe. The carburetor is provided with an air pressure jacking mechanism which comprises a shell, an air inlet is formed in the shell, an air pressure elastic piece and an ejector pin which are connected are arranged in the shell, the air pressure elastic piece deforms to drive the ejector pin to jack to block the fuel oil channel, and the air pressure elastic piece recovers to drive the ejector pin to return to open the fuel oil channel. Compared with the prior art, when a fuel gas source is opened, the fuel oil channel can be automatically closed, and the fuel oil channel can be automatically closed; when the fuel gas source is closed, the fuel oil channel can be automatically opened; fuel gas and fuel oil can be switched only by opening and closing a fuel gas source, and operation is more convenient.

Description

Technical Field

[0001] The utility model relates to the technical field of gasoline generators, in particular to a gas-fuel automatic switching system. Background Art

[0002] Compared with gasoline, gas fuel (LPG, NG) is more economical and environmentally friendly, and is more convenient to use, so it is considered to add gas fuel as an energy carrier to conventional small gasoline generators. In the prior art, dual-fuel generators all use manual or electric switching. Specifically, when gas is needed, the fuel supply must be turned off first, and then the gas supply is turned on; when fuel is needed, the gas supply must be turned off first, and then the fuel supply is turned on; the fuel switching operation is complicated, not smart and convenient enough, and has great limitations in use. Utility Model Content

[0003] The purpose of the utility model is to provide a gas-oil automatic switching system to solve the problem that the fuel switching operation of the dual-fuel generator in the prior art is complicated, not intelligent and convenient enough.

[0004] In order to achieve the above purpose, the technical solution adopted by the utility model is:

[0005] A gas-fuel automatic switching system comprises a gas source, a fuel source, a pressure reducing valve and a carburetor, wherein the fuel source is connected to the carburetor through an oil pipe, and a fuel channel is formed inside the carburetor; the gas source is connected to the pressure reducing valve through a first air pipe, and the pressure reducing valve is connected to the carburetor through a second air pipe; a gas pressure lifting mechanism is provided on the carburetor, which comprises a shell, an air inlet is provided on the shell, and a connected gas pressure elastic member and a ejector are provided inside the shell, the gas pressure elastic member can be deformed to drive the ejector to lift up to block the fuel channel, and the gas pressure elastic member can be restored to drive the ejector to retract to open the fuel channel; a branch pipe connected to the air inlet is provided on the first air pipe.

[0006] The utility model adopting the above-mentioned technical scheme, when it is necessary to use gas, the gas source is turned on, air pressure is generated in the first air pipe and the branch pipe, and connected to the air pressure lifting mechanism, the air pressure elastic member is deformed to drive the ejector pin to lift up to block the fuel channel, and the fuel channel is automatically closed, and the gas in the first air pipe enters the second air pipe after being reduced in pressure by the pressure reducing valve, and the pressure in the second air pipe (the pressure is not enough to cause the air pressure elastic member to deform) meets the engine's air intake requirement, and the engine runs with gas; when it is necessary to use fuel, the gas source is turned off, the air pressure in the first air pipe and the branch pipe is insufficient, the air pressure elastic member is restored to drive the ejector pin to retreat to open the fuel channel, and the fuel channel is automatically opened, and the engine runs with fuel; compared with the problems of complex fuel switching operation, lack of intelligence and convenience of dual-fuel generators in the prior art, the utility model can realize automatic closing of the fuel channel when the gas source is turned on; and automatic opening of the fuel channel when the gas source is turned off; switching between gas and fuel can be achieved by only opening and closing the gas source, and the operation is more convenient.

[0007] Furthermore, the carburetor includes an oil cup, a fuel through hole is provided at the bottom of the oil cup; the ejector pin is coaxial with the through hole, the front end of the ejector pin extends into the oil cup, and can block or open the through hole under the drive of the pneumatic elastic member.

[0008] Furthermore, the pneumatic elastic member is a corrugated diaphragm assembly, the four sides of the corrugated diaphragm assembly are fixed on the outer shell, a pneumatic cavity is formed between one side of the corrugated diaphragm assembly and the outer shell, and the ejector pin is fixed on the other side of the corrugated diaphragm assembly; the branch pipe is connected to the pneumatic cavity through the air inlet; when the gas is connected, there is pressure in the branch pipe, and the gas in the pneumatic cavity squeezes the corrugated diaphragm assembly to deform, thereby driving the ejector pin to push up to block the fuel channel.

[0009] Furthermore, the corrugated diaphragm assembly includes a first corrugated diaphragm and a second corrugated diaphragm arranged in parallel, and a boss is formed in the middle of adjacent sides of the two to make the two abut against each other; the ejector pin is fixed to the other side of the first corrugated diaphragm; the diameter of the first corrugated diaphragm is smaller than that of the second corrugated diaphragm; with such an arrangement, the axial deformation of the second corrugated diaphragm is the same as that of the first corrugated diaphragm, but the deformation ratio of the second corrugated diaphragm is larger than that of its own size, and its elasticity is greater and it is easier to rebound, ensuring that the operation of the air pressure lifting mechanism is more stable.

[0010] Furthermore, the shell includes a base, an intermediate bracket and a top cover which are connected in sequence, and the base is fixed on the oil cup; the first corrugated diaphragm is clamped around the base and the intermediate bracket, and the second corrugated diaphragm is clamped around the intermediate bracket and the top cover; the shell arranged in this way can more easily fix the first corrugated diaphragm and the second corrugated diaphragm.

[0011] Furthermore, air holes are provided on the side walls of the intermediate bracket; when the first corrugated diaphragm and the second corrugated diaphragm are deformed, the volume of the space formed between the first corrugated diaphragm, the second corrugated diaphragm and the intermediate bracket will change. In order to avoid the influence of the air pressure change in the space on the operation of the corrugated diaphragm assembly, air holes are provided to discharge or inhale the outside air to keep the air pressure stable.

[0012] Furthermore, the pneumatic elastic member is a bellows, one end of which is open and the other end is closed; the open end of the bellows is fixed to the shell, the branch pipe is connected to the inner cavity of the bellows through the air inlet, and the ejector pin is fixed to the closed end of the bellows; when gas is connected, there is pressure in the branch pipe, the gas in the inner cavity of the bellows squeezes the bellows assembly to deform, the bellows stretches, and then drives the ejector pin to be lifted to block the fuel channel.

[0013] Furthermore, another pressure reducing valve is provided between the gas source outlet and the first gas pipe.

[0014] Compared with the prior art, the beneficial effects of the utility model are: when the gas source is turned on, the fuel channel can be automatically closed; when the gas source is turned off, the fuel channel can be automatically opened; the switching between gas and fuel can be achieved only by turning the gas source on and off, and the operation is more convenient. BRIEF DESCRIPTION OF THE DRAWINGS

[0015] Figure 1 It is a schematic diagram of the structure of the utility model;

[0016] Figure 2 It is the structural diagram of carburetor;

[0017] Figure 3 This is an exploded view of a carburetor;

[0018] Figure 4 A partial cross-sectional view of a carburetor.

[0019] Markings in the figure: 1-gas source, 2-fuel source, 3-carburetor, 4-engine, 5-first stage pressure reducing valve, 6-second stage pressure reducing valve, 7-first air pipe, 8-branch pipe, 9-second air pipe, 10-intake duct, 11-fuel interface, 12-gas interface, 13-oil cup, 14-main nozzle, 15-base, 16-thimble, 17-first corrugated diaphragm, 18-middle bracket, 19-second corrugated diaphragm, 20-top cover, 21-fastening bolt, 22-air inlet, 23-through hole, 24-air vent, 25-air pressure chamber. DETAILED DESCRIPTION

[0020] The utility model is described in detail below in conjunction with the accompanying drawings.

[0021] In order to make the purpose, technical solution and advantages of the utility model more clear, the utility model is further described in detail below in conjunction with the accompanying drawings and embodiments. It should be understood that the specific embodiments described here are only used to explain the utility model and are not used to limit the utility model.

[0022] A gas-fuel automatic switching system comprises a gas source 1, a fuel source 2, a pressure reducing valve and a carburetor 3, wherein the fuel source 2 is connected to the carburetor 3 through an oil pipe, and a fuel channel is formed inside the carburetor 3; the gas source 1 is connected to the pressure reducing valve through a first air pipe 7, and the pressure reducing valve is connected to the carburetor 3 through a second air pipe 9; a gas pressure lifting mechanism is provided on the carburetor 3, which comprises a shell, an air inlet 22 is provided on the shell, and a connected gas pressure elastic member and a ejector pin 16 are provided inside the shell, the gas pressure elastic member can be deformed to drive the ejector pin 16 to lift up to block the fuel channel, and the gas pressure elastic member can be restored to drive the ejector pin 16 to retreat to open the fuel channel; a branch pipe 8 connected to the air inlet 22 is provided on the first air pipe 7; the gas source 1 is a gas bottle, and the fuel source 2 is a fuel tank; an air inlet 10 on the carburetor 3 is connected to a combustion chamber of an engine 4, and when the engine 4 is running, the air inlet 10 generates negative pressure to suck gas or fuel into the combustion chamber; the operation of the engine 4 can drive the generator to generate electricity;

[0023] The carburetor 3 includes an oil cup 13, and a fuel hole 23 is provided at the bottom of the oil cup 13; a ejector pin 16 is coaxial with the hole 23, and the front end of the ejector pin 16 extends into the oil cup 13, and can block or open the hole 23 under the drive of the gas pressure elastic member;

[0024] It should be noted that compared with the carburetor structure in the prior art, the carburetor 3 has the same structure except that a gas pressure lifting mechanism is provided on the oil cup; the prior structure includes: a fuel interface 11 and a gas interface 12 are provided on the carburetor 3, and the gas interface 12 is connected to the intake duct 10; the fuel interface 11 is connected to the inner cavity of the oil cup 13, and an annular boss is provided at the bottom of the inner side of the oil cup 13, and a through hole 23 is provided on the annular boss; a fastening bolt 21 is provided in the middle of the annular boss, and the rod of the fastening bolt 21 is hollow, and a fuel through hole is provided on the wall surface; a main nozzle 14 is provided in the middle of the cavity of the oil cup 13, and the channel for the fuel to flow from the inner cavity of the oil cup 13 into the central hole of the main nozzle 14 is the fuel channel, and the fuel channel can be blocked by blocking the through hole 23;

[0025] The pneumatic elastic member is a corrugated diaphragm assembly, the periphery of which is fixed on the housing, a pneumatic cavity 25 is formed between one side of the corrugated diaphragm assembly and the housing, and a ejector pin 16 is fixed on the other side of the corrugated diaphragm assembly; the branch pipe 9 is connected to the pneumatic cavity 25 through the air inlet 22;

[0026] The corrugated diaphragm assembly includes a first corrugated diaphragm 17 and a second corrugated diaphragm 19 arranged in parallel, and bosses are formed in the middle of adjacent sides of the two to make them abut against each other; a pin 16 is fixed to the other side of the first corrugated diaphragm 17; the diameter of the first corrugated diaphragm 17 is smaller than that of the second corrugated diaphragm 19.

[0027] The housing includes a base 15, an intermediate bracket 18 and a top cover 20 which are connected in sequence. The base 15 is fixed on the oil cup 13. The first corrugated diaphragm 17 is clamped around the base 15 and the intermediate bracket 18. The second corrugated diaphragm 19 is clamped around the intermediate bracket 18 and the top cover 20.

[0028] The side wall of the intermediate bracket 18 is provided with a vent hole 24;

[0029] The pneumatic elastic member can also be configured as follows: the pneumatic elastic member is a bellows, one end of the bellows is open and the other end is closed; the open end of the bellows is fixed to the shell, the branch pipe 8 is connected to the inner cavity of the bellows through the air inlet 22, and a ejector pin 16 is fixed to the closed end of the bellows;

[0030] Another pressure reducing valve is also provided between the gas outlet of the gas source 1 and the first gas pipe 7; the other pressure reducing valve is a first-stage pressure reducing valve 5, and the pressure reducing valve between the first gas pipe 7 and the second gas pipe 9 is a second-stage pressure reducing valve 6. Since the gas pressure in the gas cylinder is relatively high, a two-stage pressure reducing valve is provided to reduce the pressure to ensure that the gas pressure in the second gas pipe 9 meets the air intake requirements of the engine 4.

[0031] The utility model adopts the above-mentioned technical solution, when gas is needed, the gas source 1 is opened, air pressure is generated in the first air pipe 7 and the branch pipe 8, and connected to the air pressure lifting mechanism, the air pressure elastic member is deformed to drive the ejector pin 16 to lift up to block the fuel channel, thereby realizing automatic closing of the fuel channel, and the engine 4 uses gas to run; when fuel is needed, the gas source 1 is closed, the air pressure in the first air pipe 7 and the branch pipe 8 is insufficient, the air pressure elastic member is restored to drive the ejector pin 16 to retreat to open the fuel channel, thereby realizing automatic opening of the fuel channel, and the engine 4 uses fuel to run; compared with the problems of complex fuel switching operation, lack of intelligence and convenience of dual-fuel generators in the prior art, the utility model can realize automatic closing of the fuel channel when the gas source is opened; and automatic opening of the fuel channel when the gas source is closed; the switching between gas and fuel can be realized by only opening and closing the gas source, and the operation is more convenient.

[0032] The above description is only a preferred embodiment of the present invention and is not intended to limit the present invention. Any modifications, equivalent substitutions and improvements made within the spirit and principles of the present invention should be included in the protection scope of the present invention.

Claims

1. A gas-fuel automatic switching system, comprising a gas source (1), a fuel source (2), a pressure reducing valve and a carburetor (3), wherein the fuel source (2) is connected to the carburetor (3) via an oil pipe, and a fuel channel is formed inside the carburetor (3); the gas source (1) is connected to the pressure reducing valve via a first gas pipe (7), and the pressure reducing valve is connected to the carburetor (3) via a second gas pipe (9); characterized in that: The carburetor (3) is provided with a gas pressure lifting mechanism, which comprises a shell, an air inlet (22) is provided on the shell, and a gas pressure elastic member and a push pin (16) connected to each other are provided in the shell. The gas pressure elastic member can be deformed to drive the push pin (16) to lift up to block the fuel passage, and the gas pressure elastic member can be restored to drive the push pin (16) to retreat to open the fuel passage. The first air pipe (7) is provided with a branch pipe (8) connected to the air inlet (22).

2. The gas-oil automatic switching system according to claim 1 is characterized in that: The carburetor (3) comprises an oil cup (13), the bottom of which is provided with a fuel through hole (23); the ejector pin (16) is coaxial with the through hole (23), the front end of the ejector pin (16) extends into the oil cup (13), and can block or open the through hole (23) under the drive of a pneumatic elastic member.

3. The gas-oil automatic switching system according to claim 2 is characterized in that: The pneumatic elastic member is a corrugated diaphragm assembly, the periphery of the corrugated diaphragm assembly is fixed to the outer shell, a pneumatic cavity (25) is formed between one side of the corrugated diaphragm assembly and the outer shell, and the ejector pin (16) is fixed to the other side of the corrugated diaphragm assembly; the branch pipe (8) is connected to the pneumatic cavity (25) through the air inlet (22).

4. The gas-oil automatic switching system according to claim 3 is characterized in that: The corrugated diaphragm assembly comprises a first corrugated diaphragm (17) and a second corrugated diaphragm (19) arranged in parallel, and bosses are formed in the middle of adjacent sides of the two so that the two are in contact with each other; the ejector pin (16) is fixed to the other side of the first corrugated diaphragm (17); and the diameter of the first corrugated diaphragm (17) is smaller than that of the second corrugated diaphragm (19).

5. The gas-oil automatic switching system according to claim 4 is characterized in that: The housing comprises a base (15), an intermediate bracket (18) and a top cover (20) which are connected in sequence; the base (15) is fixed on the oil cup (13); the first corrugated diaphragm (17) is clamped around the base (15) and the intermediate bracket (18); the second corrugated diaphragm (19) is clamped around the intermediate bracket (18) and the top cover (20).

6. The gas-oil automatic switching system according to claim 5 is characterized in that: A vent hole (24) is provided on the side wall of the intermediate bracket (18).

7. The gas-oil automatic switching system according to claim 1, characterized in that: The pneumatic elastic member is a bellows, one end of the bellows is open and the other end is closed; the open end of the bellows is fixed to the outer shell, the branch pipe (8) is connected to the inner cavity of the bellows through the air inlet (22), and the ejector pin (16) is fixed to the closed end of the bellows.

8. The gas-oil automatic switching system according to claim 1, characterized in that: Another pressure reducing valve is provided between the gas outlet of the gas source (1) and the first gas pipe (7).

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