High-power frequency conversion three-fuel carburetor

Abstract

The utility model discloses a high-power frequency conversion three-fuel carburetor, and belongs to the technical field of engine fuel supply devices. The carburetor comprises a carburetor body, a throat pipe, a floater chamber, an air inlet nozzle and an oil inlet nozzle are arranged on the carburetor body, and the oil inlet nozzle is communicated with the throat pipe through a main metering jet. A choke valve and a throttle valve which are driven by a first variable frequency motor and a second variable frequency motor are arranged in the throat pipe; the variable frequency motors are hermetically mounted in a waterproof box body to avoid damage caused by water inflow; the lower end of the carburetor body is connected with an electronic valve, and fuel oil / gas switching is controlled through stretching of a valve needle. A gas inlet groove is formed in the upper end of the carburetor body, a main gas passage, an auxiliary gas passage and an idle speed gas passage are sequentially arranged in the groove in the gas flow direction, gas supply paths are dynamically switched according to engine loads (idle speed, medium speed and high power), and self-adaptive adjustment of gas is achieved. According to the utility model, the problems of poor waterproof performance, unstable gas supply and unreliable fuel switching of the variable frequency motor are solved, and the variable frequency motor is suitable for an outdoor operation generator set.

Description

Technical Field

[0001] The utility model relates to the technical field of engine fuel supply devices, and in particular to a high-power variable-frequency three-fuel carburetor suitable for outdoor operations, which solves the problems in the prior art where variable-frequency motors are easily damaged by water ingress and gas supply cannot be adaptively adjusted according to engine load. Background Art

[0002] In outdoor operations, the generator set's engine must adapt to multiple fuel requirements, including fuel oil (such as gasoline) and gas (such as natural gas and liquefied petroleum gas). The carburetor, as the core component for fuel atomization and air mixing, has a direct impact on the engine's power stability. Existing technologies have the following pain points:

[0003] 1. Insufficient waterproofness of the variable frequency motor: The outdoor environment is often humid and rainy. The variable frequency motor on the carburetor (driving the throttle and choke) is easily damaged by water ingress, causing short circuit or rust, resulting in the inability to accurately adjust the throttle / choke opening;

[0004] 2. Poor gas supply adaptability: High-power carburetors deliver gas through only a single channel in gas mode and are unable to dynamically adjust the gas supply according to engine load (idle, medium, high power), resulting in unstable mixture concentration and large fluctuations in engine power.

[0005] 3. Low reliability of fuel switching: The switching between fuel and gas relies on electronic valve control, but traditional electronic valves have slow response and poor sealing, which can easily lead to fuel residue or gas leakage.

[0006] Therefore, there is an urgent need for a carburetor with variable frequency motor waterproof protection, adaptive gas supply and reliable fuel switching. Utility Model Content

[0007] In order to solve the above problems, the purpose of this utility model is to provide a high-power variable frequency three-fuel carburetor to solve the following technical problems:

[0008] In outdoor humid environments, variable frequency motors are easily damaged by water, resulting in failure of throttle / choke adjustment; in gas mode, the gas supply volume cannot be dynamically adjusted with the engine load, and the engine power is unstable; there are residues or leakages when switching between fuel and gas, affecting the reliability of fuel supply.

[0009] To achieve the above-mentioned objectives, the present invention provides the following technical solutions: a high-power variable-frequency three-fuel carburetor, comprising a carburetor body, the carburetor body being provided with a throat, a float chamber, an air inlet nozzle and an oil inlet nozzle; the oil inlet nozzle being communicated with the float chamber through a channel, and the float chamber being communicated with the throat through a main metering orifice; a choke and a throttle being provided in the throat, the choke being driven by a first variable-frequency motor, and the throttle being driven by a second variable-frequency motor; an electronic valve being connected to the lower end of the carburetor body, the electronic valve being provided with a retractable valve needle, which retracts when power is applied and extends when power is removed and blocks the main metering orifice, thereby cutting off the fuel supply; a waterproof housing being installed at the upper end of the carburetor body, the first variable-frequency motor and the second variable-frequency motor being sealed and installed inside the waterproof housing, and the output shafts of the two motors extending through the side walls of the waterproof housing and being transmission-connected to the choke and throttle.

[0010] An air intake groove connected to the air intake nozzle is formed at the upper end of the carburetor body. The opening of the air intake groove is sealed by a sealing cover, and a pressure-maintaining chamber is formed between the air intake groove and the sealing cover. A main air passage, an auxiliary air passage, and an idle air passage are arranged in the air intake groove, wherein the idle air passage leads to a position on the end surface of the throat pipe near the throttle valve and is used to supply air when the engine is idling or under low load.

[0011] The waterproof box is sealed and connected to the carburetor body by bolts, and a sealing ring is provided between the output shafts of the first and second frequency conversion motors and the shaft holes of the side wall of the waterproof box.

[0012] The diameters of the main air duct, the auxiliary air duct and the idle air duct decrease in sequence, and the opening condition of the idle air duct is that the throttle opening is ≤10%, the opening condition of the auxiliary air duct is that the throttle opening is 30%-70%, and the opening condition of the main air duct is that the throttle opening is ≥70%.

[0013] The electronic valve is a solenoid valve, the valve needle is coaxially arranged with the main metering orifice, and when the valve needle is extended, the gap between the valve needle and the main metering orifice is ≤0.1mm, thereby ensuring sealing.

[0014] The waterproof box includes a bottom plate and an upper cover. The lower end surface of the bottom plate is provided with several supporting feet, and the supporting feet are provided with through holes. Bolts are passed through the through holes to connect with the carburetor body. The upper end surface of the bottom plate is provided with a convex wall surrounding its contour near the edge. The upper cover is provided with a accommodating groove adapted for the first variable frequency motor and the second variable frequency motor. The outer peripheral wall of the upper cover is provided with a buckle block, and a bayonet corresponding to the buckle block is provided on the bottom plate. The upper cover and the bottom plate are connected by the buckle block and the bayonet. The upper cover covers the convex wall, and the convex wall can better isolate the liquid and improve the waterproof performance.

[0015] Technical Effects The beneficial effects of the utility model are:

[0016] 1. Waterproof protection for variable frequency motors: The first and second variable frequency motors are sealed and installed in a waterproof box to prevent outdoor humid environments or rain from directly contacting the motors, preventing the motors from short circuiting or rusting due to water ingress, thereby improving equipment reliability.

[0017] 2. Adaptive gas supply: The intake tank is equipped with three air ducts: main, auxiliary, and idle. The air supply path is dynamically switched according to the engine load: at idle / light load, only the idle air duct supplies air (small air volume to meet minimum demand); at medium load, the auxiliary air duct provides additional air supply (moderate air volume to balance energy consumption and power); at high power load, the main air duct supplies air or both the main and auxiliary air ducts supply air simultaneously (sufficient air volume to ensure stable mixture concentration). This achieves adaptive matching of gas supply and engine load, avoiding power fluctuations and reducing fuel loss.

[0018] 3. High fuel switching reliability: The electronic valve controls the on / off of the main metering orifice by retracting the valve needle. When power is on, the valve needle retracts (fuel enters), and when power is off, the valve needle extends (gas is restored). The structure is simple and the response is fast. Combined with the sealing protection of the waterproof box, it prevents fuel leakage and improves switching reliability.

[0019] The present invention will be further described below with reference to the accompanying drawings and specific embodiments. BRIEF DESCRIPTION OF THE DRAWINGS

[0020] Figure 1 A perspective view of a specific embodiment of the present utility model;

[0021] Figure 2 A cutaway view of a specific embodiment of the present utility model;

[0022] Figure 3 It is a partial exploded view of a specific embodiment of the utility model;

[0023] Figure 4 This is a structural diagram of the air inlet groove in a specific embodiment of the present utility model;

[0024] Figure 5 It is a structural diagram of the throat end face in a specific embodiment of the present invention.

[0025] Wherein, description of the accompanying drawings:

[0026] 1-carburetor body; 2-throat; 3-float chamber; 4-intake nozzle; 5-fuel inlet nozzle; 6-main metering orifice; 7-choke; 8-throttle; 9-first variable-frequency motor; 10-second variable-frequency motor; 11-electronic valve; 12-valve needle; 13-waterproof box; 14-sealing cover; 15-pressure-maintaining chamber; 16-main air duct; 17-auxiliary air duct; 18-idle air duct; 19-throat end face; 131-base plate; 132-upper cover; 133-convex wall; 20-connecting groove. DETAILED DESCRIPTION

[0027] 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.

[0028] like Figure 1 — Figure 3 As shown, this embodiment of a high-power variable-frequency three-fuel carburetor includes a carburetor body 1, which is equipped with a throat pipe 2 (the core channel for mixing fuel and air), a float chamber 3 (for storing fuel), an air inlet nozzle 4, and a fuel inlet nozzle 5 (for connecting to the fuel tank). The fuel inlet nozzle 5 is connected to the float chamber 3 via a passage. The bottom of the float chamber 3 is connected to the throat pipe 2 via a main metering orifice 6. Fuel enters the throat pipe 2 through the main metering orifice 6 and is atomized.

[0029] A choke 7 (to adjust the intake volume and control the mixture concentration) and a throttle 8 (to adjust the mixture flow rate) are installed in the throat 2. The choke 7 is driven by a first variable frequency motor 9, and the throttle 8 is driven by a second variable frequency motor 10. The two motors can automatically adjust the opening according to signals such as engine speed and load (need to cooperate with an external controller).

[0030] The lower end of the carburetor body 1 is connected to the electronic valve 11, and a retractable valve needle 12 is set inside the electronic valve 11: when the electronic valve 11 is energized, the valve needle 12 retracts under the action of electromagnetic force, and the main metering orifice 6 is connected (fuel mode); when the electronic valve 11 is de-energized, the valve needle 12 extends under the action of spring force, blocking the main metering orifice 6 (switching to gas mode).

[0031] like Figure 2 As shown, a waterproof box 13 is installed on the upper end of the carburetor body 1, and the first variable frequency motor 9 and the second variable frequency motor 10 are installed inside the waterproof box 13 through a sealing rubber ring or a flange seal. The output shafts of the two motors extend through the shaft holes on the side walls of the waterproof box 13 and are respectively connected to the rotating shafts of the choke 7 and the throttle 8 to ensure that the motors can work stably in a humid environment.

[0032] like Figure 4 As shown, an air intake groove connected to the air intake nozzle 4 is opened at the upper end of the carburetor body 1, and the opening of the air intake groove is blocked by a sealing cover 14 (the sealing cover 14 and the edge of the air intake groove are sealed by bolts or sealant), and a pressure-maintaining chamber 15 is formed between the air intake groove and the sealing cover 14 (to store gas at a certain pressure to prevent external air pressure fluctuations from affecting the air supply).

[0033] A main air passage 16, an auxiliary air passage 17 and an idle air passage 18 are provided in the air intake groove.

[0034] Specific as Figure 5As shown, the idle air passage 18 leads to the throat end face 19 near the throttle valve (near the throttle valve 8). A connecting groove 20 is provided on the throat end face 19 corresponding to the idle air passage 18, so that the idle air passage 18 is connected with the inner hole of the throat pipe 2. In this way, the gas directly passes through the throttle valve. The pipe diameter is the smallest and is only opened when the engine is idling or lightly loaded (the throttle valve 8 opening is ≤10%) to provide a small amount of gas to meet the minimum operating requirements.

[0035] The auxiliary air passage 17 has a medium diameter and opens when the engine is moderately loaded (the throttle valve 8 is opened 30%-70%) to supplement gas to balance power and energy consumption;

[0036] The main air passage 16 is located at the outermost side of the air intake groove and has the largest diameter. When the engine is under high power load (the throttle valve 8 opening is ≥70%), the main air passage 16 is opened or the main air passage 16 and the auxiliary air passage 17 are opened at the same time to jointly provide sufficient fuel gas to ensure a stable mixture concentration.

[0037] The waterproof box body 13 includes a bottom plate 131 and an upper cover 132. The lower end surface of the bottom plate 131 is provided with a plurality of supporting feet, each of which is provided with a through-hole. Bolts pass through the through-holes to connect with the carburetor body. The upper end surface of the bottom plate is provided with a convex wall 133 surrounding its contour near the edge. The upper cover 132 is provided with a receiving groove adapted for the first variable frequency motor and the second variable frequency motor. The outer peripheral wall of the upper cover 132 is provided with a buckle block, and the bottom plate 131 is provided with a bayonet corresponding to the buckle block. The upper cover 132 and the bottom plate 131 are connected by the buckle block and the bayonet. The upper cover 132 covers the convex wall 133, which can better isolate the liquid and improve the waterproof performance.

[0038] The above technical solution can achieve the following technical effects:

[0039] 1. Waterproof protection for variable frequency motors: The first and second variable frequency motors are sealed and installed in a waterproof box to prevent outdoor humid environments or rain from directly contacting the motors, preventing the motors from short circuiting or rusting due to water ingress, thereby improving equipment reliability.

[0040] 2. Adaptive gas supply: The air intake tank is equipped with three levels of air ducts: main, auxiliary, and idle. The air supply path is dynamically switched according to the engine load: at idle / light load, only the idle air duct supplies air (small air volume to meet minimum demand); at medium load, the auxiliary air duct provides additional air supply (moderate air volume to balance energy consumption and power); at high power load, both the main and auxiliary air ducts supply air simultaneously (sufficient air volume to ensure stable mixture concentration). This achieves adaptive matching of gas supply and engine load, avoiding power fluctuations and reducing fuel loss.

[0041] 3. High fuel switching reliability: The electronic valve controls the on / off of the main metering orifice by retracting the valve needle. When power is on, the valve needle retracts (fuel enters), and when power is off, the valve needle extends (gas is restored). The structure is simple and the response is fast. Combined with the sealing protection of the waterproof box, it prevents fuel leakage and improves switching reliability.

Claims

1. A high-power variable frequency three-fuel carburetor, comprising a carburetor body (1), wherein the carburetor body (1) is provided with a throat (2), a float chamber (3), an air inlet nozzle (4) and an oil inlet nozzle (5); the oil inlet nozzle (5) is communicated with the float chamber (3) through a passage, and the float chamber (3) is communicated with the throat (2) through a main metering orifice (6); a choke (7) and a throttle valve (8) are provided in the throat (2), the choke valve (7) is driven by a first variable frequency motor (9), and the throttle valve (8) is driven by a second variable frequency motor (10); and the characteristics are: A waterproof box (13) is installed at the upper end of the carburetor body (1), the first variable frequency motor (9) and the second variable frequency motor (10) are installed inside the waterproof box (13), and the output shaft extends from the side wall of the waterproof box (13); an air intake groove connected to the air intake nozzle (4) is opened at the upper end of the carburetor body (1), the opening of the air intake groove is blocked by a sealing cover (14), and a pressure-maintaining chamber (15) is formed between the air intake groove and the sealing cover (14); a main air duct (16), an auxiliary air duct (17) and an idle air duct (18) are arranged in the air intake groove, wherein: the idle air duct (18) leads to a position on the throat end face (19) close to the throttle valve (8), and the auxiliary air duct (17) and the main air duct (16) lead to a position on the throat (2) close to the throttle valve.

2. The high-power variable frequency three-fuel carburetor according to claim 1, characterized in that: The waterproof box (13) is sealed and connected to the carburetor body (1) via bolts, and a sealing ring is provided between the output shafts of the first variable frequency motor (9) and the second variable frequency motor (10) and the shaft holes on the side wall of the waterproof box (13).

3. The high-power variable frequency three-fuel carburetor according to claim 1, characterized in that: The diameters of the main air passage (16), the auxiliary air passage (17) and the idle air passage (18) decrease in sequence, and the opening condition of the idle air passage (18) is that the throttle valve (8) opening is ≤10%, the opening condition of the auxiliary air passage (17) is that the throttle valve (8) opening is 30%-70%, and the opening condition of the main air passage (16) is that the throttle valve (8) opening is ≥70%.

4. The high-power variable frequency three-fuel carburetor according to claim 1, characterized in that: The lower end of the carburetor body (1) is connected to an electronic valve (11), and a retractable valve needle (12) is provided on the electronic valve (11). When power is on, the valve needle (12) retracts, and when power is off, the valve needle (12) extends to block the main metering hole (6).

5. The high-power variable frequency three-fuel carburetor according to claim 4, characterized in that: The electronic valve (11) is a solenoid valve, and the valve needle (12) is coaxially arranged with the main metering hole (6). When the valve needle (12) is extended, the gap between the valve needle (12) and the main metering hole (6) is ≤0.1 mm, thereby ensuring sealing.

6. The high-power variable frequency three-fuel carburetor according to claim 1, characterized in that: The waterproof box (13) includes a bottom plate (131) and an upper cover (132). The lower end surface of the bottom plate (131) is provided with a plurality of supporting feet, each of which is provided with a through-hole, through which bolts are connected to the carburetor body. The upper end surface of the bottom plate is provided with a convex wall (133) surrounding the contour thereof near the edge. The upper cover (132) is provided with a receiving groove adapted to the first variable frequency motor and the second variable frequency motor. A buckle block is provided on the outer peripheral wall of the upper cover (132). A bayonet corresponding to the buckle block is provided on the bottom plate (131). The upper cover (132) and the bottom plate (131) are connected by buckling with the bayonet through the buckle block, and the upper cover (132) covers the convex wall (133).

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