High-power pure vaporizer

Abstract

The utility model discloses a high-power pure vaporizer, and belongs to the technical field of fuel supply of gas engines. The engine comprises a body, a throat pipe, a throttle valve, a variable frequency motor, an air inlet cavity and a multi-channel air inlet structure (a high-speed air inlet channel, a medium-speed air inlet channel and a low-speed air inlet channel). Through the caliber gradient design (high speed > medium speed > low speed) of each channel and outlet position optimization (high speed is in the middle, the medium speed is close to the lower part and the low speed is close to the upper part), and in combination with a throttle valve and a limiting adjusting mechanism driven by a variable frequency motor, dynamic adjustment of gas flow under different working conditions is realized, the mixing efficiency is improved, the energy consumption is reduced, and the emission standard is met.

Description

Technical Field

[0001] The utility model belongs to the technical field of gas engine fuel supply systems, and specifically relates to a high-power pure vaporizer for a gas engine, and is particularly suitable for a multi-channel vaporizer that needs to dynamically adjust the gas-air mixture ratio according to different operating conditions (high speed, medium speed, low speed / idle speed). Background Art

[0002] During the operation of a gas engine, the mixing efficiency of gas and air directly affects the engine's energy consumption, combustion completeness, and emissions. In existing technologies, gas engines typically use a carburetor structure with a single main metering orifice, where gas enters the throat and mixes with air only through the main metering orifice. However, this structure has significant drawbacks:

[0003] 1. Poor adaptability to operating conditions: The engine's gas flow requirements vary greatly under different operating conditions, such as high speed, medium speed, and low speed / idling. A single main metering orifice cannot dynamically adjust the intake volume according to the operating conditions, resulting in excessive gas flow at low speed / idling (wasting energy) or insufficient flow at high speed (reduced power).

[0004] 2. Incomplete combustion: The gas-air mixture ratio cannot accurately match the operating conditions. Incompletely burned gas is directly discharged, resulting in excessive levels of pollutants (such as CO and HC), which cannot meet environmental emission standards.

[0005] 3. High energy consumption: To compensate for insufficient mixing efficiency, the engine often needs to increase the gas supply, further exacerbating energy waste.

[0006] Therefore, it is urgent to design a high-power pure carburetor that can dynamically adjust multi-channel intake and optimize the mixing ratio according to the engine operating conditions to solve the above technical problems. Utility Model Content

[0007] In order to solve the above problems, the purpose of the present invention is to provide a high-power pure vaporizer, which realizes precise adjustment of the gas flow under different working conditions through a multi-channel air intake structure, a throttle driven by a variable frequency motor and a limit adjustment mechanism, thereby improving the mixing efficiency, reducing energy consumption and meeting emission standards.

[0008] To achieve the above-mentioned object, the present invention provides the following technical solution: a high-power pure carburetor, comprising a body, a throat pipe provided on the body, a throttle valve provided in the throat pipe; a variable frequency motor mounted above the body, the variable frequency motor being in driving connection with the throttle valve for controlling the opening of the throttle valve; an air intake cavity provided at the lower end of the body, an air intake pipe connected to the outer wall of the air intake cavity; a high-speed air intake channel, a medium-speed air intake channel, and a low-speed air intake channel provided between the air intake cavity and the throat pipe; wherein:

[0009] The high-speed air intake passage is arranged in the middle of the throat pipe, and its diameter is larger than that of the medium-speed air intake passage, and the diameter of the medium-speed air intake passage is larger than that of the low-speed air intake passage;

[0010] The outlet ends of the low-speed air intake passage and the medium-speed air intake passage are close to the throttle position;

[0011] The throttle valve is mounted on the throttle shaft and is rotatable about the shaft. The throttle shaft is connected to a limit swing arm. A first and second protrusions are provided on the peripheral wall of the body. The first and second protrusions are arranged on the movable track of the limit swing arm to limit the swing range of the limit swing arm. An adjusting screw is also provided on the first protrusion to adjust the maximum rotation angle of the throttle valve.

[0012] A secondary main metering orifice is disposed in each of the low-speed air intake passage and the medium-speed air intake passage; the outlet of the medium-speed air intake passage is disposed at the lower portion of the throat pipe and is closer to the throttle valve than the outlet of the main metering orifice;

[0013] The low-speed air intake passage includes a first straight passage and a second straight passage connected in sequence. A connecting groove is provided on the outer wall of the main body. The first straight passage connects the air intake cavity and the connecting groove, and the second straight passage connects the connecting groove and the upper part of the inner wall of the throat pipe (near the throttle position); a detachable cover is provided on the connecting groove for closing or opening the internal space of the low-speed air intake passage.

[0014] Furthermore, the main metering orifice is arranged at a conventional air inlet position of the throat (such as the throat contraction section), and together with the air outlets of the high-speed, medium-speed and low-speed air inlet channels, forms a multi-channel mixing structure.

[0015] Furthermore, the caliber of the high-speed air intake channel is greater than the caliber of the medium-speed air intake channel, which is greater than the caliber of the low-speed air intake channel, so as to match the demand gradient of the gas flow under different working conditions (high speed requires large flow, low speed requires small flow).

[0016] Furthermore, one end of the limiting swing arm is fixed to the throttle shaft, and the other end is movably clamped between the first boss and the second boss. The maximum swing angle of the swing arm can be adjusted by the adjusting screw on the first boss, thereby limiting the maximum opening of the throttle (such as the fully open angle under high-speed conditions).

[0017] Furthermore, the second straight channel outlet of the low-speed air intake channel is located at the upper part of the inner wall of the throat, forming an "upper-middle-lower" layered air outlet structure with the lower throat outlet of the medium-speed air intake channel and the conventional position of the main metering hole, thereby avoiding mutual interference between airflows in different channels and improving mixing uniformity.

[0018] The beneficial effects of the utility model are:

[0019] 1. Multi-channel dynamic adjustment to adapt to various operating conditions: Through three independent intake channels for high, medium, and low speeds, combined with the channel diameter gradient (high speed > medium speed > low speed) and outlet position design (high speed in the middle, medium speed lower, low speed upper), the intake channel is automatically switched by taking advantage of the difference in throat negative pressure under different engine operating conditions (high negative pressure at high speed, low negative pressure at low speed). At low speed / idle speed, only the low-speed channel is ventilated (low flow); at medium speed, the medium-speed channel is ventilated (medium flow); at high speed, all three channels are ventilated (high flow), accurately matching gas demand and avoiding flow waste or insufficient flow.

[0020] 2. Improved mixing efficiency and more complete combustion: The outlet of the medium-speed channel is close to the throttle (shortening the mixing path), and the low-speed channel has stratified gas outlet (avoiding airflow collision). Combined with the precise control of small flow rates by the auxiliary main orifice, this ensures a more uniform mixing of gas and air, more complete combustion, and reduces emissions of pollutants such as CO and HC, meeting environmental standards.

[0021] 3. Precise throttle control for optimized power output: A variable-frequency motor drives the throttle opening. Combined with the mechanical limiters of the limit swing arm and the first and second bosses, and the fine-tuning function of the adjustment screw, the maximum throttle opening can be flexibly adjusted under different operating conditions (such as full opening at high speeds and a limited opening at low speeds). This prevents frequent and large throttle swings, improves control accuracy and response speed, and ensures engine power stability.

[0022] 4. Compact and reliable structure, easy maintenance: The low-speed air intake channel adopts a segmented design with a first straight channel + a second straight channel + a connecting groove. The cover can be quickly disassembled for maintenance. The channels are rationally arranged (high-speed in the center, medium-speed at the bottom, and low-speed at the top), reducing airflow interference and improving overall reliability.

[0023] The present invention will be further described below with reference to the accompanying drawings and specific embodiments. BRIEF DESCRIPTION OF THE DRAWINGS

[0024] Figure 1 A perspective view of a specific embodiment of the present utility model;

[0025] Figure 2 A cross-sectional view of a specific embodiment of the present utility model;

[0026] Figure 3 It is a partial three-dimensional diagram of a specific embodiment of the utility model;

[0027] Figure 4 This is a cross-sectional view of a medium-speed air intake passage in a specific embodiment of the present invention;

[0028] Figure 5 It is a cross-sectional view of the low-speed air intake passage in a specific embodiment of the present invention.

[0029] In the figure, 1-main body; 2-throat; 4-throttle; 5-frequency conversion motor; 6-intake chamber; 7-intake pipe; 8-high-speed intake channel; 9-medium-speed intake channel; 10-low-speed intake channel; 11-main metering orifice; 12-secondary main metering orifice; 13-throttle shaft; 14-limiting swing arm; 15-first boss; 16-second boss; 17-adjusting screw; 18-first straight channel; 19-second straight channel; 20-connecting groove; 21-cover. DETAILED DESCRIPTION

[0030] 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.

[0031] like Figure 1 — Figure 5 As shown, this embodiment discloses a high-power pure vaporizer. The main body 1 is a cylindrical shell with a hollow interior forming a gas passage. A throat 2 (a constricted section structure for accelerating airflow and generating negative pressure) is located in the middle of the main body 1. A throttle valve 4 (for regulating gas flow) is installed within the throat 2. A variable frequency motor 5 is fixed to the top of the main body 1 via a bracket. The output shaft of the variable frequency motor 5 is connected to the throttle shaft 13 via a coupling (the throttle shaft 13 extends horizontally through the main body 1 and is fixed at both ends by bearings). This drives the throttle valve 4 to rotate about its axis to adjust the opening.

[0032] The lower end of the main body 1 is connected to the air intake chamber 6 (a cylindrical cavity), and the outer wall of the air intake chamber 6 is welded to the air intake pipe 7 (which is connected to the gas source). Three parallel air intake channels are provided between the air intake chamber 6 and the throat pipe 2: a high-speed air intake channel 8, a medium-speed air intake channel 9, and a low-speed air intake channel 10.

[0033] The high-speed air intake channel 8 is arranged along the axial direction of the throat pipe 2, with the inlet located on the side wall of the air intake cavity 6 (on the same side as the air intake pipe 7), and the outlet located in the middle of the throat pipe 2 (the midpoint of the contraction section). It has the largest diameter (such as Φ15mm) and is used for large-flow gas supply under high-speed working conditions.

[0034] The entrance of the medium-speed intake channel 9 is also located on the side wall of the intake cavity 6, and the outlet is located at the lower part of the throat 2 (close to the throttle 4, about 20 mm away from the throat outlet). The diameter is medium (such as Φ10 mm) and is used for medium flow supply under medium-speed working conditions.

[0035] The entrance of the low-speed intake passage 10 is located at the top of the intake chamber 6. The passage is divided into two sections: a first straight channel 18 extends vertically downward, connecting the intake chamber 6 with a connecting groove 20 (5mm deep) on the outer wall of the body 1. A second straight channel 19 extends horizontally rightward, connecting the connecting groove 20 with the upper portion of the inner wall of the throat pipe 2 (approximately 10mm from the top of the throat pipe, near the throttle valve 4). This channel has the smallest overall diameter (e.g., Φ5mm) and the highest outlet position (closest to the throttle valve 4). This channel is used to supply low-flow air under low-speed / idle conditions. The connecting groove 20 is sealed with a threaded cover 21, making it easy to disassemble and clean carbon deposits within.

[0036] The outlet ends of the high-speed, medium-speed and low-speed air intake channels are all equipped with secondary main metering orifices 12 (small-diameter metering orifices, used for precise metering at low flow rates), while the main metering orifice 11 is set at the conventional air intake position of the throat pipe 2 (the starting end of the contraction section) for basic gas supply under medium and high-speed working conditions.

[0037] The throttle valve 4 is mounted on the right side of the main body 1 via a throttle shaft 13. The shaft end is fixedly connected to a limit swing arm 14 (an L-shaped metal plate). A first boss 15 and a second boss 16 (both 10mm high and 15mm apart) are welded to the perimeter of the main body 1. The movable end of the limit swing arm 14 is clamped between the two bosses. An adjustment screw 17 (threaded connection) on the first boss 15 adjusts the maximum swing angle of the swing arm (e.g., 0° to 90°), thereby limiting the maximum opening of the throttle valve 4 (e.g., the throttle shaft rotates 90° when fully open).

[0038] How it works

[0039] 1. Low-speed / idle operating condition: The engine speed is low, and the negative pressure in the throat pipe 2 is relatively small (approximately -5 to -10 kPa). This can only overcome the resistance of the low-speed intake passage 10 (due to its smallest diameter, the resistance is the greatest). At this time, the high-speed and medium-speed intake passages automatically close due to insufficient negative pressure, and only the low-speed passage is ventilated. The secondary main metering orifice 12 accurately controls a small flow of gas into the throat pipe, where it mixes with air and enters the engine for combustion.

[0040] 2. Medium-speed operating condition: As the engine speed increases, the negative pressure in the throat increases (approximately -10 to -20 kPa). The resistance of the low-speed intake passage 10 is insufficient to block the airflow, but the resistance of the medium-speed intake passage 9 (medium diameter) is still greater than the current negative pressure. Therefore, the medium-speed passage opens, while the high-speed passage remains closed. The medium-flow gas in the medium-speed passage mixes with the air to meet the medium-speed power requirement.

[0041] 3. High-speed operating conditions: When the engine is running at high speed or under heavy load, the negative pressure in the throat increases significantly (approximately -20 to -30 kPa). The resistance of the three intake channels is overcome, and the high-speed, medium-speed, and low-speed channels are ventilated simultaneously. A large flow of fuel gas enters the throat through the main metering orifice 11 and each auxiliary main metering orifice 12, where it is fully mixed with the air, ensuring high-speed power output.

[0042] 4. Throttle Adjustment: Variable frequency motor 5 drives throttle valve 4 to rotate according to the engine ECU signal, adjusting the opening to control the total air intake volume. The limit swing arm 14 and the first and second bosses limit the maximum throttle opening (such as full opening at high speeds). The adjusting screw 17 can fine-tune the maximum opening (for example, to adapt to different engine models), ensuring the accuracy and reliability of throttle control.

[0043] Through the above technical solution,

[0044] 1. Multi-channel dynamic adjustment to adapt to various operating conditions: Through three independent intake channels for high, medium, and low speeds, combined with the channel diameter gradient (high speed > medium speed > low speed) and outlet position design (high speed in the middle, medium speed lower, low speed upper), the intake channel is automatically switched by taking advantage of the difference in throat negative pressure under different engine operating conditions (high negative pressure at high speed, low negative pressure at low speed). At low speed / idle speed, only the low-speed channel is ventilated (low flow); at medium speed, the medium-speed channel is ventilated (medium flow); at high speed, all three channels are ventilated (high flow), accurately matching gas demand and avoiding flow waste or insufficient flow.

[0045] 2. Improved mixing efficiency and more complete combustion: The outlet of the medium-speed channel is close to the throttle (shortening the mixing path), and the low-speed channel has stratified gas outlet (avoiding airflow collision). Combined with the precise control of small flow rates by the auxiliary main orifice, this ensures a more uniform mixing of gas and air, more complete combustion, and reduces emissions of pollutants such as CO and HC, meeting environmental standards.

[0046] 3. Precise throttle control for optimized power output: A variable-frequency motor drives the throttle opening. Combined with the mechanical limiters of the limit swing arm and the first and second bosses, and the fine-tuning function of the adjustment screw, the maximum throttle opening can be flexibly adjusted under different operating conditions (such as full opening at high speeds and a limited opening at low speeds). This prevents frequent and large throttle swings, improves control accuracy and response speed, and ensures engine power stability.

[0047] 4. Compact and reliable structure, easy maintenance: The low-speed air intake channel adopts a segmented design with a first straight channel + a second straight channel + a connecting groove. The cover can be quickly disassembled for maintenance. The channels are rationally arranged (high-speed in the center, medium-speed at the bottom, and low-speed at the top), reducing airflow interference and improving overall reliability.

[0048] The above shows and describes the basic principles and main features of the present invention and the advantages of the present invention. It is obvious to those skilled in the art that the present invention is not limited to the details of the above exemplary embodiments and that the present invention can be implemented in other specific forms without departing from the spirit or essential characteristics of the present invention. Therefore, from all perspectives, the embodiments should be regarded as illustrative and non-restrictive. The scope of the present invention is defined by the appended claims rather than the above description, and it is intended that all changes that fall within the meaning and range of equivalents of the claims be included in the present invention. Any reference signs in the claims should not be construed as limiting the claim to which they relate.

[0049] In addition, it should be understood that although this specification is described in terms of implementation methods, not every implementation method contains only one independent technical solution. This narrative method of the specification is only for the sake of clarity. Those skilled in the art should regard the specification as a whole. The technical solutions in each embodiment can also be appropriately combined to form other implementation methods that can be understood by those skilled in the art.

Claims

1. A high-power pure carburetor, comprising a body (1), a throat (2) provided on the body (1), a throttle (4) provided in the throat (2); a variable frequency motor (5) mounted above the body (1), the variable frequency motor (5) being in driving connection with the throttle (4); an air intake chamber (6) provided at the lower end of the body (1), an air intake pipe (7) being connected to the outer wall of the air intake chamber (6); characterized in that, A high-speed air intake channel (8), a medium-speed air intake channel (9) and a low-speed air intake channel (10) are provided between the air intake cavity (6) and the throat pipe (2); The high-speed air intake channel (8) is arranged in the middle of the throat (2), and its diameter is larger than that of the medium-speed air intake channel (9), and the diameter of the medium-speed air intake channel (9) is larger than that of the low-speed air intake channel (10); the outlet ends of the low-speed air intake channel (10) and the medium-speed air intake channel (9) are close to the throttle valve (4); the throttle valve (4) is mounted on the throttle shaft (13) and can rotate around the axis, and the throttle shaft (13) is connected to a limit swing arm (14); a first convex column (15) and a second convex column (16) are provided on the peripheral wall of the body (1), and the first convex column (15) and the second convex column (16) are arranged on the movable track of the limit swing arm (14); the first convex column (15) is also provided with an adjusting screw (17); The low-speed air intake channel (10) and the medium-speed air intake channel (9) are respectively provided with a secondary main metering orifice (12); the air outlet of the medium-speed air intake channel (9) is arranged at the lower part of the throat pipe (2) and is closer to the throttle valve (4) than the air outlet of the main metering orifice (11); the low-speed air intake channel (10) includes a first straight channel (18) and a second straight channel (19) which are connected in sequence, and a connecting groove (20) is provided on the outer wall of the body (1), the first straight channel (18) connects the air intake chamber (6) and the connecting groove (20), and the second straight channel (19) connects the connecting groove (20) and the upper part of the inner wall of the throat pipe (2); the connecting groove (20) is detachably provided with a cover (21).

2. The high-power pure vaporizer according to claim 1, characterized in that: The diameter of the high-speed air intake passage (8) is greater than the diameter of the medium-speed air intake passage (9) and greater than the diameter of the low-speed air intake passage (10).

3. The high-power pure vaporizer according to claim 1, characterized in that: One end of the limiting swing arm (14) is fixed to the throttle shaft (13), and the other end is movably clamped between the first boss (15) and the second boss (16); the adjusting screw (17) on the first boss (15) is used to adjust the maximum swing angle of the limiting swing arm (14).

4. The high-power pure vaporizer according to claim 1, characterized in that: The air outlet of the medium-speed air inlet channel (9) is located at the lower part of the throat (2), and the outlet of the second straight channel (19) of the low-speed air inlet channel (10) is located at the upper part of the inner wall of the throat (2), forming a layered air outlet structure.

5. The high-power pure vaporizer according to claim 1, characterized in that: The main metering orifice (11) is arranged at the starting end of the contraction section of the throat pipe (2), and together with the outlets of the high-speed air intake channel (8), the medium-speed air intake channel (9), and the low-speed air intake channel (10) form a multi-channel mixing structure.

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