Outdoor frequency conversion multi-fuel carburetor

Abstract

The utility model discloses an outdoor variable-frequency multi-fuel carburetor, and belongs to the technical field of engine fuel supply devices. The device comprises a body, a floater chamber and a throat pipe are arranged on the body, and a throttle valve and a choke valve which are driven by a variable frequency motor are arranged in the throat pipe; a first air inlet nozzle, an oil nozzle and a negative pressure valve are installed on the body, the negative pressure valve achieves automatic switching between fuel oil and fuel gas through a double-diaphragm structure, fuel gas pressure pushes a second diaphragm and drives a first diaphragm, a valve needle blocks a fuel oil main metering hole, and fuel oil supply is cut off; the negative pressure valve at the bottom of the floater chamber preferentially cuts off fuel oil at low temperature to ensure the concentration of mixed gas; the body is further provided with a choke valve rope control mechanism, the opening degree of a choke valve is adjusted through an inhaul cable when the motor fails, and the concentration of mixed gas is improved. The carburetor solves the problems that an existing carburetor is tedious in fuel switching, unreliable in low-temperature starting and lack of choke valve emergency control, and is suitable for an outdoor operation generator.

Description

Technical Field

[0001] The utility model relates to the technical field of engine fuel supply devices, in particular to a variable frequency carburetor suitable for outdoor operations with automatic multi-fuel switching, low-temperature start optimization and choke emergency control. Background Art

[0002] In outdoor operation scenarios, the engines in generator sets need to adapt to the diverse fuel requirements of fuel oil (such as gasoline) and gas (such as natural gas and liquefied petroleum gas), while also facing challenges in harsh working conditions such as low temperatures and high altitudes. In existing technologies, carburetors have the following pain points:

[0003] Fuel switching is cumbersome: Traditional carburetors use manual valves to switch between fuel and gas channels, which is complex and inefficient, and cannot adapt to dynamic changes in engine operating conditions;

[0004] Poor reliability in low-temperature starting: In low-temperature environments, fuel atomization is poor, and the mixture concentration is difficult to meet starting requirements. The choke must be manually closed to increase the mixture concentration. However, manual operation is subject to environmental restrictions (such as wearing gloves and failure at low temperatures), resulting in low reliability.

[0005] Lack of emergency control of the choke: The choke of existing carburetors is mostly driven by an electric motor. When the battery fails or the motor fails, the choke opening cannot be quickly adjusted manually, resulting in the mixture concentration being out of control and the engine being unable to start.

[0006] Therefore, there is an urgent need for a carburetor that can automatically switch fuels, adapt to harsh working conditions and has emergency choke control. Utility Model Content

[0007] The purpose of this utility model is to provide an outdoor variable frequency multi-fuel carburetor to solve the following technical problems: the fuel (oil / gas) switching needs to be manually operated and cannot be automatically adjusted according to the engine status; the mixture concentration is insufficient under harsh working conditions such as low temperature, and manual intervention is required to close the choke, which makes the operation unreliable; when the choke drive motor fails, there is a lack of a manual emergency adjustment mechanism, which affects the engine starting.

[0008] To achieve the above-mentioned object, the present invention provides the following technical solution: an outdoor variable frequency multi-fuel carburetor, comprising a body, a float chamber and a throat pipe provided on the body, a throttle valve and a choke valve provided in the throat pipe, the throttle valve being driven by a first variable frequency motor, and the choke valve being driven by a second variable frequency motor, so as to automatically adjust the opening according to the engine state;

[0009] A first air intake nozzle and an oil nozzle are installed on the main body. The oil nozzle extends into the float chamber and is connected to the main metering orifice. The first air intake nozzle is connected to the throat pipe through the gas metering orifice. A negative pressure valve is installed on the side wall of the bottom of the float chamber, and a second air intake nozzle is provided on the negative pressure valve. The first air intake nozzle and the second air intake nozzle intake air (input gas) at the same time, and the negative pressure valve blocks the main metering orifice after intake. A choke rope control mechanism is also installed on the main body. The choke opening is manually closed through the choke rope control mechanism, thereby increasing the concentration of the mixed gas in the throat pipe and improving the starting performance of the engine.

[0010] A diaphragm cavity is formed inside the negative pressure valve, and a first diaphragm and a second diaphragm are arranged in sequence in the diaphragm cavity along the airflow direction, the two diaphragms are parallel and the edges are sealed with the inner wall of the diaphragm cavity; a valve needle is fixedly connected to the middle of the first diaphragm, and the valve needle extends axially toward the main metering orifice; a needle hole is provided on the side wall of the diaphragm cavity, and the needle hole is coaxially aligned with the side hole on the side wall of the main metering orifice; a spring groove is provided at the inlet end of the needle hole (close to the side of the diaphragm cavity), and a compression spring is installed in the spring groove, one end of the compression spring abuts the bottom of the spring groove, and the other end abuts the valve needle top seat, providing a backward reset force for the valve needle; the outer diameter of the valve needle top seat is larger than the outer diameter of the valve needle, and is used to limit excessive movement of the valve needle in the direction of the spring groove.

[0011] A pressure chamber is formed between the second diaphragm and the inner wall of the diaphragm cavity, and the pressure chamber is connected to an external gas source through a second gas inlet nozzle; protrusions are respectively provided on adjacent surfaces of the first diaphragm and the second diaphragm, and the two protrusions contact and cooperate to transmit pressure;

[0012] The body is also equipped with a choke rope control mechanism, which includes a rotating seat connected to the upper end surface of the body. The choke has a choke shaft, which is rotatably disposed in the rotating seat. The rotating seat is provided with a reset groove corresponding to the choke shaft. A reset torsion spring is disposed in the reset groove. The reset torsion spring is sleeved on the choke shaft and has its other end connected to the inner wall of the reset groove (under the action of the reset torsion spring, the choke is opened to its maximum by default).

[0013] The end of the choke shaft is fixedly connected to a toggle plate, an arc-shaped movable groove is provided on the toggle plate, a rope seat is slidably provided in the arc-shaped movable groove, the rope seat is provided with a socket for inserting the rope end, and a locking screw (for fixing the rope) is provided on the socket; a limiting protrusion is provided at the bottom of the rope seat, and an annular groove is provided on the peripheral wall of the lower end of the limiting protrusion, and a snap ring for bottom limiting is provided in the slot, and a limiting groove (limiting the sliding range of the rope seat) adapted to the thickness of the toggle plate is formed between the snap ring and the bottom surface of the rope seat, so that the rope can be installed conveniently, and the cooperation between the limiting protrusion and the snap ring limits the rope seat to sliding only in the arc-shaped movable groove, thereby preventing the rope seat from detaching from the toggle plate.

[0014] The beneficial effects of the utility model are:

[0015] 1. Automatic multi-fuel switching: After the first and second air inlet nozzles simultaneously take in air, the gas pressure pushes the second diaphragm through the double diaphragm structure of the negative pressure valve, driving the first diaphragm, causing the valve needle to block the main fuel metering hole, cutting off the fuel supply, and realizing automatic switching between fuel and gas without manual operation, thus improving efficiency;

[0016] 2. High reliability in low-temperature starting: In low-temperature environments, the gas mode is started first, the negative pressure valve cuts off the fuel supply, and the choke is set to the maximum opening by default and adjusted by the variable frequency motor to ensure that the mixture concentration meets the starting requirements;

[0017] 3. Reliable emergency control of the choke: When the motor fails, the choke rope control mechanism can drive the toggle plate to rotate by pulling the rope, thereby adjusting the choke opening, forcibly increasing the mixture concentration, and ensuring engine starting; the structure of the limit block and the retaining ring limits the sliding range to avoid excessive pulling and damage to components.

[0018] The present invention will be further described below with reference to the accompanying drawings and specific embodiments. BRIEF DESCRIPTION OF THE DRAWINGS

[0019] Figure 1 A three-dimensional diagram of a specific embodiment of the present invention Figure 1 ;

[0020] Figure 2 A three-dimensional diagram of a specific embodiment of the present invention Figure 2 ;

[0021] Figure 3 It is a partial cross-sectional view of a specific embodiment of the utility model;

[0022] Figure 4 It is an overall cross-sectional view of a specific embodiment of the utility model;

[0023] Figure 5 for Figure 4 Enlarged view of point A in the middle.

[0024] Wherein, description of the accompanying drawings:

[0025] 1-body; 2-float chamber; 3-throat; 4-throttle; 5-choke; 6-first variable frequency motor; 7-second variable frequency motor; 8-first air inlet nozzle; 9-oil nozzle; 10-main metering orifice; 12-negative pressure valve; 13-second air inlet nozzle; 14-diaphragm chamber; 15-first diaphragm; 16-second diaphragm; 17-valve needle; 18-top seat; 19-needle hole; 20-spring groove; 21-compression spring; 22-side hole; 23-pressure chamber; 24-bump; 25-rotating seat; 26-choke shaft; 27-reset groove; 28-reset torsion spring; 29-slide plate; 30-arc-shaped movable groove; 31-rope seat; 32-jack; 33-locking screw; 34-limiting bump; 35-slot; 36-snapping ring. DETAILED DESCRIPTION

[0026] The present invention is described in detail below through examples, which are only used to further illustrate the present invention and should not be construed as limiting the scope of protection of the present invention.

[0027] like Figure 1 — Figure 4 As shown, the outdoor variable-frequency multi-fuel carburetor of this embodiment includes a body 1, within which is located a float chamber 2 (for fuel storage) and a throat 3 (for the fuel-air mixture). Throttle 4 (for regulating the mixture flow velocity) and choke 5 (for regulating the intake air volume and controlling the mixture concentration) are mounted within throat 3. Throttle 4 is driven by a first variable-frequency motor 6, while choke 5 is driven by a second variable-frequency motor 7. Both motors automatically adjust their openings based on signals such as engine speed and temperature (requiring coordination with an external controller, not shown).

[0028] Main body 1 is equipped with a first air inlet nozzle 8 (for gas input, which enters the throat through the gas metering orifice) and a fuel nozzle 9 (connected to the fuel tank). Fuel nozzle 9 extends into float chamber 2 and communicates with main metering orifice 10 (fuel enters throat 3 through fuel nozzle 9 and main metering orifice 10). A negative pressure valve 12 is installed on the bottom sidewall of float chamber 2. Secondary air inlet nozzle 13 of negative pressure valve 12 is connected to a gas source (such as a gas tank) for gas input. The gas source is split into two, connecting both first air inlet nozzle 8 and second air inlet nozzle 13.

[0029] Specific as Figure 3As shown, the interior of the negative pressure valve 12 is a diaphragm chamber 14, within which are positioned, from top to bottom, a first diaphragm 15 and a second diaphragm 16 (parallel to each other, their edges sealed and bonded to the inner wall of the diaphragm chamber 14). A valve needle 17 is fixedly attached to the center of the first diaphragm 15. This needle 17 extends downward and passes through a pinhole 19 at the bottom of the diaphragm chamber 14 (pinhole 19 is coaxially aligned with a side hole 22 in the sidewall of the main metering orifice 10). A spring slot 20 is defined at the inlet end of pinhole 19 (near the diaphragm chamber 14). A compression spring 21 is mounted within this slot, its upper end abutting the bottom of the slot and its lower end abutting the top seat 18 at the top of the valve needle 17 (the outer diameter of the top seat 18 is larger than that of the valve needle 17, preventing the valve needle 17 from dislodging from the slot).

[0030] A pressure chamber 23 is formed between the second diaphragm 16 and the inner wall of the diaphragm cavity 14. This pressure chamber 23 communicates with an external gas source via the second gas inlet nozzle 13. (When gas is introduced, the pressure in the pressure chamber 23 increases.) Protrusions 24 are provided on the lower surface of the first diaphragm 15 and the upper surface of the second diaphragm 16 (the two protrusions engage and mate) to transmit pressure.

[0031] When switched to gas mode, the gas is divided into two paths: one path directly enters the throat pipe 3 through the first air inlet nozzle 8; the other path enters the pressure chamber 23 through the second air inlet nozzle 13, pushing the second diaphragm 16 to collide and move forward. The protrusion 24 of the second diaphragm 16 contacts the protrusion 24 of the first diaphragm 15 and pushes the first diaphragm 15 forward. The first diaphragm 15 drives the valve needle 17 forward through the needle hole 19 and the side hole 22, blocking the inner hole of the main metering orifice 10 and cutting off the fuel supply. At this time, only the gas entering the throat pipe 3 through the gas metering orifice and the first air inlet nozzle 8 is mixed with air.

[0032] like Figure 5 As shown, the choke rope control mechanism includes a rotating seat 25 (mounted on the upper end surface of the body 1), the choke shaft 26 is rotatably arranged in the rotating seat 25, a reset groove 27 is provided in the rotating seat 25, and a reset torsion spring 28 is provided in the reset groove 27 (sleeved on the choke shaft 26), one end of the reset torsion spring 28 is connected to the inner wall of the reset groove 27, and the other end is connected to the choke shaft 26 (under the action of the reset torsion spring 28, the choke shaft 26 rotates clockwise by default, and the choke 5 is opened to a maximum of 90°).

[0033] The end of the choke shaft 26 is fixedly connected to a toggle plate 29. The toggle plate 29 defines an arcuate movable slot 30. A rope seat 31 is slidably positioned within the slot (sliding left and right along the slot), facilitating rope adjustment and installation. The rope seat 31 defines a receptacle 32, into which the end of a rope (not shown) is inserted and secured by a locking screw 33. A retaining protrusion 34 is positioned at the bottom of the rope seat 31. An annular retaining groove 35 is defined in the lower peripheral wall of the retaining protrusion 34. A retaining ring 36 is positioned within the retaining groove 35 (a retaining groove formed between the retaining ring 36 and the bottom surface of the rope seat 31 matches the thickness of the toggle plate 29). This restricts the rope seat 31 to sliding only within the arcuate movable slot 30, facilitating rope connection and installation and preventing it from falling out.

[0034] When the choke 5 needs to be manually adjusted (such as when the battery fails and the variable frequency motor cannot be used), the rope is pulled to drive the rope seat 31 to slide along the arc-shaped movable groove 30 to the end. The rope seat 31 drives the choke shaft 26 to rotate clockwise through the toggle plate 29, and the choke 5 is closed, thereby increasing the concentration of the mixed gas in the throat 3 and assisting the engine starting.

[0035] Using the above technical solution,

[0036] 1. Automatic multi-fuel switching: After the first and second air inlet nozzles simultaneously take in air, the gas pressure pushes the second diaphragm through the double diaphragm structure of the negative pressure valve, driving the first diaphragm, causing the valve needle to block the main fuel metering hole, cutting off the fuel supply, and realizing automatic switching between fuel and gas without manual operation, thus improving efficiency;

[0037] 2. High reliability in low-temperature starting: In low-temperature environments, gas mode takes priority when starting, the negative pressure valve cuts off the fuel supply, and the choke is set to its default maximum opening (or adjusted via the variable frequency motor) to ensure that the mixture concentration meets starting requirements. If further optimization is required, a temperature sensor can be used to control the variable frequency motor to adjust the choke opening (although the sensor is not specified, the variable frequency motor's "adjustment based on engine status" function implies this function).

[0038] 3. Reliable emergency control of the choke: When the motor fails, the choke rope control mechanism can drive the toggle plate to rotate by pulling the rope, thereby adjusting the choke opening, forcibly increasing the mixture concentration, and ensuring engine starting; the structure of the limit block and the retaining ring limits the sliding range to avoid excessive pulling and damage to components.

Claims

1. An outdoor variable frequency multi-fuel carburetor, characterized in that: The invention comprises a main body (1), wherein the main body (1) is provided with a float chamber (2) and a throat pipe (3), wherein a throttle valve (4) and a choke valve (5) are provided in the throat pipe (3), wherein the throttle valve (4) is driven by a first variable frequency motor (6), and the choke valve (5) is driven by a second variable frequency motor (7); a first air inlet nozzle (8) and an oil nozzle (9) are installed on the main body (1), wherein the oil nozzle (9) extends into the float chamber (2) and is communicated with the main metering hole (10), and the first air inlet nozzle (8) is communicated with the throat pipe (3) through the gas metering hole; a negative pressure valve (12) is installed on the side wall of the bottom of the float chamber (2), and a second air inlet nozzle (13) is provided on the negative pressure valve (12); the first air inlet nozzle (8) and the second air inlet nozzle (13) At the same time, air is taken in, and the negative pressure valve (12) blocks the main metering hole after the air is taken in. A choke rope control mechanism is also installed on the main body (1), and the choke opening is manually closed through the choke rope control mechanism.

2. The outdoor variable frequency multi-fuel carburetor according to claim 1, characterized in that: A diaphragm cavity (14) is formed inside the negative pressure valve (12), and a first diaphragm (15) and a second diaphragm (16) are sequentially arranged in the diaphragm cavity (14) along the air flow direction, and the edges of the two diaphragms are sealed and connected to the inner wall of the diaphragm cavity (14); a valve needle (17) is fixedly connected to the middle of the first diaphragm (15), and the valve needle (17) extends axially toward the main metering orifice (10); a needle hole (19) is opened on the side wall of the diaphragm cavity (14), and the needle hole (19) is coaxially aligned with the side hole (22) of the side wall of the main metering orifice (10); ... 9) A spring groove (20) is provided at the inlet end, a compression spring (21) is installed in the spring groove (20), one end of the compression spring (21) abuts against the bottom of the spring groove (20), and the other end abuts against the top seat (18) of the valve needle (17); a pressure chamber (23) is formed between the second diaphragm (16) and the inner wall of the diaphragm cavity (14), and the pressure chamber (23) is connected to the external air source through the second air inlet nozzle (13); protrusions (24) are respectively provided on the adjacent surfaces of the first diaphragm (15) and the second diaphragm (16), and the two protrusions (24) are in contact with each other.

3. The outdoor variable frequency multi-fuel carburetor according to claim 2, characterized in that: The outer diameter of the top seat (18) of the valve needle (17) is larger than the outer diameter of the valve needle (17), and is used to limit the excessive movement of the valve needle (17) toward the spring groove (20).

4. The outdoor variable frequency multi-fuel carburetor according to claim 1, characterized in that: The choke rope control mechanism includes a rotating seat (25) connected to the upper end surface of the body (1); the choke (5) has a choke shaft (26); the choke shaft (26) is rotatably arranged in the rotating seat (25); a reset groove (27) corresponding to the choke shaft (26) is provided in the rotating seat (25); a reset torsion spring (28) is provided in the reset groove (27); the reset torsion spring (28) is sleeved on the choke shaft (26) and the other end is connected to the inner wall of the reset groove (27); the end of the choke shaft (26) is fixedly connected to a toggle plate (29); the toggle plate (29) is fixedly connected to the end of the choke shaft (26 ... 9) is provided with an arc-shaped movable groove (30), a rope seat (31) is slidably provided in the arc-shaped movable groove (30), a socket (32) for inserting the end of the rope is provided on the rope seat (31), and a locking screw (33) is provided on the socket (32); a limiting protrusion (34) is provided at the bottom of the rope seat (31), an annular clamping groove (35) is provided on the peripheral wall of the lower end of the limiting protrusion (34), a clamping ring (36) is provided in the clamping groove (35), and a limiting groove adapted to the thickness of the toggle plate (29) is formed between the clamping ring (36) and the bottom surface of the rope seat (31).

5. The outdoor variable frequency multi-fuel carburetor according to claim 4, characterized in that: The cooperation between the limiting protrusion (34) and the snap ring (36) limits the rope seat (31) to slide only within the arc-shaped movable groove (30), thereby preventing the rope seat (31) from detaching from the toggle plate (29).

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