A multi-fuel automatic switching device and engine

Abstract

The utility model relates to a kind of multi-fuel automatic switching device and engine, comprising: carburetor, pressure reducing valve and control module, the control module includes negative pressure switch solenoid valve, pressure sensor, controller and oil circuit switch solenoid valve, the negative pressure switch solenoid valve with the pressure sensor is set on the pressure reducing valve, the negative pressure switch solenoid valve is connected and controls the on-off of the air inlet, the oil circuit switch solenoid valve is set on the oil inlet pipe of carburetor, the oil circuit switch solenoid valve is connected and controls the on-off of the oil inlet pipe;The controller is according to the gas pressure data of the air inlet control the negative pressure switch solenoid valve, the oil circuit switch solenoid valve.Distinguish prior art, the utility model can avoid gas fuel into carburetor, avoid appearing oil-gas mixed combustion, lead to the situation of engine work not normal appears.

Description

Technical Field

[0001] This utility model relates to the field of dual-fuel carburetor technology, and in particular to a multi-fuel automatic switching device and engine. Background Technology

[0002] Existing technologies, such as patent publication number CN218467721U, disclose an automatic fuel switching system, a multi-fuel engine, and a generator set. This automatic fuel switching system includes a pressure reducing valve, a carburetor, a solenoid valve, a pressure sensor, and a fuel switching control module. The signal input terminal of the solenoid valve is connected to the first control signal output terminal of the fuel switching control module, and the signal output terminal of the pressure sensor is connected to the pressure signal input terminal of the fuel switching control module. The pressure sensor detects the gas pressure signal entering the intake port of the pressure reducing valve and sends the gas pressure signal to the fuel switching control module. The fuel switching control module receives the gas pressure signal and controls the energization state of the solenoid valve based on the gas pressure signal. The solenoid valve is mounted on the carburetor and controls the opening or closing of the carburetor's liquid fuel inlet.

[0003] The existing technology has the following problems:

[0004] In existing technologies, the absence of a negative pressure switch solenoid valve makes it impossible to control the opening and closing of the air intake via a pressure sensor, which can easily lead to fuel-air mixture combustion and cause abnormal engine operation.

[0005] The above statements are for the purpose of providing background information in relation to this application only and do not necessarily constitute prior art. Utility Model Content

[0006] In view of the above problems, this application provides a multi-fuel automatic switching device and engine to solve the technical problem in the prior art that the lack of a negative pressure switch solenoid valve makes it impossible to control the opening and closing of the air intake through a pressure sensor, which easily leads to fuel-air mixture combustion and abnormal engine operation.

[0007] To achieve the above objectives, in a first aspect, this application provides a multi-fuel automatic switching device, comprising:

[0008] A carburetor, which is mounted on an engine and is provided with an intake manifold and a fuel inlet manifold;

[0009] A pressure reducing valve, wherein the pressure reducing valve is provided with an air inlet and an air outlet, the air outlet being connected to the air inlet pipe via a first pipe; and

[0010] The control module includes a negative pressure switch solenoid valve, a pressure sensor, a controller, and a fuel line switch solenoid valve. The negative pressure switch solenoid valve and the pressure sensor are mounted on the pressure reducing valve. The negative pressure switch solenoid valve is connected to and controls the opening and closing of the air inlet. The fuel line switch solenoid valve is mounted on the fuel inlet pipe of the carburetor and is connected to and controls the opening and closing of the fuel inlet pipe.

[0011] The pressure sensor is connected to the air inlet and detects the gas pressure at the air inlet. The pressure sensor is electrically connected to the controller and transmits the gas pressure data at the air inlet to the controller. The controller controls the negative pressure switch solenoid valve and the oil circuit switch solenoid valve based on the gas pressure data at the air inlet.

[0012] Unlike existing technologies, the technical solution of this application includes a control module comprising a negative pressure switch solenoid valve, a pressure sensor, a controller, and a fuel line switch solenoid valve. The negative pressure switch solenoid valve and the pressure sensor are mounted on the pressure reducing valve. The negative pressure switch solenoid valve is connected to and controls the opening and closing of the air inlet. The fuel line switch solenoid valve is mounted on the fuel inlet pipe of the carburetor and is connected to and controls the opening and closing of the fuel inlet pipe. The pressure sensor is connected to the air inlet and detects the gas pressure at the air inlet. The pressure sensor is electrically connected to the controller and transmits the gas pressure data from the air inlet to the controller. The controller controls the negative pressure switch solenoid valve and the fuel line switch solenoid valve based on the gas pressure data from the air inlet.

[0013] During operation, the negative pressure switch solenoid valve is normally closed, and the fuel line switch solenoid valve is normally open. In this state, the dual-fuel carburetor receives fuel normally and runs on gasoline. When the pressure sensor detects that the gas pressure in the intake port exceeds a preset value, the fuel line switch solenoid valve closes the fuel inlet pipe, and the negative pressure switch solenoid valve opens the intake port. Conversely, when the pressure sensor detects that the gas pressure in the intake port is lower than the preset value, the fuel line switch solenoid valve opens the fuel inlet pipe, and the negative pressure switch solenoid valve closes the intake port. Thus, by using the negative pressure switch solenoid valve, when the gaseous fuel pressure is low, the intake port is closed and the fuel inlet pipe is opened, preventing gaseous fuel from entering the carburetor and avoiding fuel-air mixture combustion, which could lead to abnormal engine operation.

[0014] In one embodiment of this utility model, the negative pressure switch solenoid valve is connected to the air inlet through a second pipe, and the pressure sensor is connected to the air inlet through a third pipe.

[0015] Thus, the negative pressure switch solenoid valve can open or close the air inlet through the second pipe, and the pressure sensor can be connected to the air inlet through the third pipe to detect the pressure of the gas in the air inlet and the gas pressure of the gas fuel supply device.

[0016] In one embodiment of this utility model, the second pipe is located to the left of the air inlet, and the third pipe is located to the right of the air inlet.

[0017] Thus, with the second and third pipes located on both sides of the air inlet, it is convenient to arrange the negative pressure switch solenoid valve and pressure sensor.

[0018] In one embodiment of this utility model, the air inlet extends along a first direction, and the air outlet extends along a second direction, wherein the first direction and the second direction are perpendicular to each other.

[0019] In this way, the extension direction of the air inlet is perpendicular to the extension direction of the air outlet, and they do not interfere with each other.

[0020] In one embodiment of this utility model, the pressure reducing valve includes an air inlet channel, the air inlet is located at the end of the air inlet channel, the negative pressure switch solenoid valve is connected to the air inlet channel through a second pipe, and the pressure sensor is connected to the air inlet channel through a third pipe, with the connection point of the third pipe and the air inlet channel located close to the air inlet.

[0021] Thus, the connection between the third pipe and the intake channel is closer to the intake port than the connection between the second pipe and the intake channel, allowing the pressure sensor to still detect the gas pressure of the gas fuel supply device at the intake port even after the negative pressure switch solenoid valve cuts off the intake channel.

[0022] In one embodiment of this utility model, the air intake pipe is disposed on one side of the oil inlet pipe, and the oil circuit switch solenoid valve is disposed at the bottom of the carburetor.

[0023] This makes it easier to arrange the solenoid valves for the oil circuit switches.

[0024] As one embodiment of this utility model, the multi-fuel automatic switching device further includes a dual-fuel automatic switching base cup, which is disposed on the carburetor. The dual-fuel automatic switching base cup is provided with a gas inlet port, which is connected to the outlet of the pressure reducing valve and is connected to the intake pipe.

[0025] Thus, by setting up a dual-fuel automatic switching cup, which automatically switches the fuel supply channel of the carburetor based on the pressure of the gas, the dual-fuel automatic switching cup can mechanically control the automatic switching between gas and liquid fuel, while the pressure sensor detects the automatic switching between gas and liquid fuel electronically. Electronic equipment is prone to failure, and when the pressure sensor fails, the dual-fuel automatic switching cup ensures the normal operation of the automatic switching device, playing a double insurance role.

[0026] In one embodiment of this utility model, the dual-fuel automatic switching cup includes a housing, a needle valve assembly, a needle valve drive assembly, and a gas control assembly. The needle valve assembly, needle valve drive assembly, and gas control assembly are disposed within the housing. The housing is provided with a float chamber, and the fuel inlet pipe is connected to the float chamber. The needle valve assembly is used to control the opening and closing of the fuel circuit between the float chamber and the carburetor. The needle valve drive assembly is used to drive the needle valve assembly by the pressure of the gas.

[0027] In this way, liquid fuel enters the float chamber, and the needle valve assembly controls the opening and closing of the fuel passage between the float chamber and the carburetor. The needle valve drive assembly drives the needle valve assembly to control whether fuel is supplied to the carburetor based on the pressure of the gaseous fuel. When the pressure of the gaseous fuel exceeds the preset value, the needle valve assembly closes the fuel passage between the float chamber and the carburetor, and the gaseous fuel enters the carburetor normally. When the pressure of the gaseous fuel is lower than the preset value, the needle valve assembly opens the fuel passage between the float chamber and the carburetor, closes the gaseous fuel intake passage, and the dual-fuel carburetor receives fuel normally and runs on gasoline.

[0028] In one embodiment of this utility model, the negative pressure switch solenoid valve is a normally closed solenoid valve, and the oil circuit switch solenoid valve is a normally open solenoid valve.

[0029] When the pressure sensor detects that the gas pressure in the air inlet exceeds a preset value, the oil circuit switch solenoid valve closes the oil inlet pipe, and the negative pressure switch solenoid valve opens the air inlet.

[0030] When the pressure sensor detects that the gas pressure in the air inlet is lower than a preset value, the oil circuit switch solenoid valve opens the oil inlet pipe, and the negative pressure switch solenoid valve closes the air inlet.

[0031] In this way, under normal circumstances, the dual-fuel carburetor receives fuel normally and runs on gasoline. The negative pressure switch solenoid valve can close the air intake and open the fuel inlet when the gaseous fuel pressure is relatively low, thus preventing gaseous fuel from entering the carburetor and avoiding the occurrence of fuel-air mixture combustion, which could lead to abnormal engine operation.

[0032] To achieve the above objectives, in a second aspect, this application provides an engine including a multi-fuel automatic switching device as described in any of the preceding claims.

[0033] Unlike existing technologies, the engine in this application uses a negative pressure switch solenoid valve to close the air intake and open the fuel inlet when the gaseous fuel pressure is low. This prevents gaseous fuel from entering the carburetor and avoids the combustion of fuel-air mixture, which could lead to abnormal engine operation.

[0034] The above description of the utility model is merely an overview of the technical solution of this application. In order to enable those skilled in the art to better understand the technical solution of this application and to implement it based on the description and drawings, and to make the above-mentioned objectives and other objectives, features and advantages of this application easier to understand, the following description is provided in conjunction with the specific embodiments and drawings of this application. Attached Figure Description

[0035] The accompanying drawings are only used to illustrate the principles, implementation methods, applications, features, and effects of specific embodiments of this application and other related content, and should not be considered as limitations on this application.

[0036] In the accompanying drawings of the instruction manual:

[0037] Figure 1 This is a schematic diagram of the structure of a multi-fuel automatic switching device according to an embodiment of this application;

[0038] Figure 2 This is a system schematic diagram of a multi-fuel automatic switching device according to an embodiment of this application;

[0039] Figure 3 This is a schematic diagram of the structure of a carburetor according to an embodiment of this application;

[0040] Figure 4 This is a schematic diagram of the carburetor from another angle according to one embodiment of this application;

[0041] Figure 5 This is a schematic diagram of the structure of a pressure reducing valve according to an embodiment of this application;

[0042] Figure 6 This is a schematic diagram of the pressure reducing valve according to one embodiment of this application from another angle;

[0043] Figure 7 This is a schematic diagram illustrating the principle of a carburetor with an automatic dual-fuel switching base cup according to one embodiment of this application.

[0044] The reference numerals used in the above figures are explained as follows:

[0045] a) First direction, b) Second direction

[0046] 1. Carburetor; 11. Intake pipe; 12. Fuel inlet pipe.

[0047] 2. Pressure reducing valve; 21. Air inlet; 22. Air outlet; 23. First pipe; 24. Air inlet passage;

[0048] 31. Negative pressure switch solenoid valve; 32. Pressure sensor; 33. Controller; 34. Oil circuit switch solenoid valve; 35. Second pipeline; 36. Third pipeline.

[0049] 4. Automatic dual-fuel switching base cup. Detailed Implementation

[0050] To illustrate the possible application scenarios, technical principles, implementable specific solutions, and achievable objectives and effects of this application in detail, the following description, in conjunction with the listed specific embodiments and accompanying drawings, provides a detailed explanation. The embodiments described herein are merely illustrative of the technical solutions of this application and are therefore intended to limit the scope of protection of this application.

[0051] In this document, the term "embodiment" means that a specific feature, structure, or characteristic described in connection with an embodiment may be included in at least one embodiment of this application. The term "embodiment" appearing in various places throughout the specification does not necessarily refer to the same embodiment, nor does it specifically limit its independence or connection with other embodiments. In principle, in this application, as long as there are no technical contradictions or conflicts, the technical features mentioned in each embodiment can be combined in any way to form corresponding implementable technical solutions.

[0052] Unless otherwise defined, the technical terms used herein have the same meaning as commonly understood by one of ordinary skill in the art to which this application pertains; the use of related terms herein is merely for the purpose of describing particular embodiments and is not intended to limit this application.

[0053] In the description of this application, the term "and / or" is used to describe the logical relationship between objects, indicating that three relationships can exist. For example, "multi-fuel automatic switching device and / or B" means: the existence of a multi-fuel automatic switching device, the existence of B, and the simultaneous existence of a multi-fuel automatic switching device and B. Additionally, the character " / " in this document generally indicates that the preceding and following objects have an "or" logical relationship.

[0054] In this application, terms such as “first” and “second” are used only to distinguish one entity or operation from another, and do not necessarily require or imply any actual quantity, hierarchy or order relationship between these entities or operations.

[0055] Without further limitations, the use of terms such as “comprising,” “including,” “having,” or other similar open-ended expressions in this application is intended to cover non-exclusive inclusion, which does not exclude the presence of additional elements in a process, method, or product that includes the stated elements, such that a process, method, or product that includes a list of elements may include not only those defined elements but also other elements not expressly listed, or elements inherent to such a process, method, or product.

[0056] Similar to the understanding in the Examination Guidelines, in this application, expressions such as "greater than," "less than," and "exceeding" are understood to exclude the stated number; expressions such as "above," "below," and "within" are understood to include the stated number. Furthermore, in the description of the embodiments in this application, "multiple" means two or more (including two), and similar expressions related to "multiple" are also understood in this way, such as "multiple groups" and "multiple times," unless otherwise explicitly specified.

[0057] In the description of the embodiments of this application, the space-related expressions used, such as "center," "longitudinal," "lateral," "length," "width," "thickness," "upper," "lower," "front," "rear," "left," "right," "vertical," "horizontal," "vertical," "top," "bottom," "inner," "outer," "clockwise," "counterclockwise," "axial," "radial," and "circumferential," indicate the orientation or positional relationship based on the orientation or positional relationship shown in the specific embodiments or drawings. They are only for the purpose of describing the specific embodiments of this application or for the reader's understanding, and do not indicate or imply that the device or component referred to must have a specific position, a specific orientation, or be constructed or operated in a specific orientation. Therefore, they should not be construed as limitations on the embodiments of this application.

[0058] In existing technologies, the absence of a negative pressure switch solenoid valve makes it impossible to control the opening and closing of the air intake via a pressure sensor, which can easily lead to fuel-air mixture combustion and cause abnormal engine operation.

[0059] In view of this, this application provides a multi-fuel automatic switching device, including a control module. The control module includes a negative pressure switch solenoid valve 31, a pressure sensor 32, a controller 33, and a fuel circuit switch solenoid valve 34. The negative pressure switch solenoid valve 31 and the pressure sensor 32 are mounted on the pressure reducing valve 2. The negative pressure switch solenoid valve 31 is connected to and controls the opening and closing of the air inlet 21. The fuel circuit switch solenoid valve 34 is mounted on the fuel inlet pipe 12 of the carburetor 1 and is connected to and controls the opening and closing of the fuel inlet pipe 12. The pressure sensor 32 is connected to the air inlet 21 and detects the gas pressure of the air inlet 21. The pressure sensor 32 is electrically connected to the controller 33 and transmits the gas pressure data of the air inlet 21 to the controller 33. The controller 33 controls the negative pressure switch solenoid valve 31 and the fuel circuit switch solenoid valve 34 according to the gas pressure data of the air inlet 21. By using the negative pressure switch solenoid valve 31, the air inlet 21 can be closed and the fuel inlet pipe 12 can be opened when the gaseous fuel pressure is relatively low, thus preventing gaseous fuel from entering the carburetor 1 and avoiding the occurrence of fuel-air mixture combustion, which could lead to abnormal engine operation.

[0060] According to some embodiments of this application, please refer to Figures 1 to 6 This embodiment relates to a multi-fuel automatic switching device, including a carburetor 1, a pressure reducing valve 2, and a control module. The carburetor 1 is installed on the engine and is provided with an intake pipe 11 and a fuel inlet pipe 12. The pressure reducing valve 2 is provided with an intake port 21 and an outlet port 22. The outlet port 22 is connected to the intake pipe 11 through a first pipe 23. The control module includes a negative pressure switch solenoid valve 31, a pressure sensor 32, a controller 33, and a fuel circuit switch solenoid valve 34. The negative pressure switch solenoid valve 31 and the pressure sensor 32 are provided on the pressure reducing valve 2. The negative pressure switch solenoid valve 31 is connected to and controls the opening and closing of the intake port 21. The fuel circuit switch solenoid valve 34 is provided on the fuel inlet pipe 12 of the carburetor 1 and is connected to and controls the opening and closing of the fuel inlet pipe 12.

[0061] Pressure sensor 32 is connected to air inlet 21 and detects the gas pressure at air inlet 21. Pressure sensor 32 is electrically connected to controller 33 and transmits the gas pressure data at air inlet 21 to controller 33. Controller 33 controls negative pressure switch solenoid valve 31 and oil circuit switch solenoid valve 34 based on the gas pressure data at air inlet 21.

[0062] In this embodiment, the principles of the carburetor 1, pressure reducing valve 2, pressure sensor 32, controller 33, and fuel circuit switch solenoid valve 34 are conventional technical means, and the specific principles will not be described in detail.

[0063] The controller can control the negative pressure switch solenoid valve to open or close the air inlet 21. Its principle and structure are conventional technical solutions, which will not be described in detail here.

[0064] In this embodiment, the pressure sensor 32 can be integrated with the controller or set separately from the controller, both of which are within the protection scope of this embodiment;

[0065] This embodiment uses a control module including a negative pressure switch solenoid valve 31, a pressure sensor 32, a controller 33, and a fuel line switch solenoid valve 34. The negative pressure switch solenoid valve 31 and the pressure sensor 32 are mounted on the pressure reducing valve 2. The negative pressure switch solenoid valve 31 is connected to and controls the opening and closing of the air inlet 21. The fuel line switch solenoid valve 34 is mounted on the fuel inlet pipe 12 of the carburetor 1 and is connected to and controls the opening and closing of the fuel inlet pipe 12. The pressure sensor 32 is connected to the air inlet 21 and detects the gas pressure at the air inlet 21. The pressure sensor 32 is electrically connected to the controller 33 and transmits the gas pressure data from the air inlet 21 to the controller 33. The controller 33 controls the negative pressure switch solenoid valve 31 and the fuel line switch solenoid valve 34 based on the gas pressure data from the air inlet 21.

[0066] During operation, the negative pressure switch solenoid valve 31 is normally closed, and the fuel circuit switch solenoid valve 34 is normally open. At this time, the dual-fuel carburetor 1 is normally fueled and runs on gasoline. When the pressure sensor 32 detects that the gas pressure in the air inlet 21 exceeds the preset value, the fuel circuit switch solenoid valve 34 closes the fuel inlet pipe 12, and the negative pressure switch solenoid valve 31 opens the air inlet 21. When the pressure sensor 32 detects that the gas pressure in the air inlet 21 is lower than the preset value, the fuel circuit switch solenoid valve 34 opens the fuel inlet pipe 12, and the negative pressure switch solenoid valve 31 closes the air inlet 21.

[0067] In this embodiment, the preset value of the pressure sensor 32 is 1.2 kPa.

[0068] Thus, by using the negative pressure switch solenoid valve 31, the air inlet 21 can be closed and the fuel inlet pipe 12 can be opened when the gaseous fuel pressure is relatively low, thereby preventing gaseous fuel from entering the carburetor 1 and avoiding the occurrence of fuel-air mixture combustion, which could lead to abnormal engine operation.

[0069] According to some embodiments of this application, optionally, such as Figure 5 As shown, the negative pressure switch solenoid valve 31 is connected to the air inlet 21 through the second pipe 35, and the pressure sensor 32 is connected to the air inlet 21 through the third pipe 36.

[0070] Thus, the negative pressure switch solenoid valve 31 can open or close the air inlet 21 through the second pipe 35, and the pressure sensor 32 can be connected to the air inlet 21 through the third pipe 36 to detect the pressure of the gas in the air inlet 21 and the gas pressure of the gas fuel supply device.

[0071] According to some embodiments of this application, optionally, the second pipe 35 is located on the left side of the air inlet 21, and the third pipe 36 is located on the right side of the air inlet 21.

[0072] Thus, with the second pipe 35 and the third pipe 36 located on both sides of the air inlet 21, it is convenient to arrange the negative pressure switch solenoid valve 31 and the pressure sensor 32.

[0073] According to some embodiments of this application, optionally, the air inlet 21 extends along a first direction (as shown by arrow a in the figure), and the air outlet 22 extends along a second direction (as shown by arrow b in the figure), wherein the first direction (as shown by arrow a in the figure) and the second direction (as shown by arrow b in the figure) are perpendicular to each other.

[0074] Thus, the extension direction of the air inlet 21 is perpendicular to the extension direction of the air outlet 22, and they do not interfere with each other.

[0075] According to some embodiments of this application, optionally, the pressure reducing valve 2 includes an air intake channel 24, an air inlet 21 located at the end of the air intake channel 24, a negative pressure switch solenoid valve 31 connected to the air intake channel 24 through a second pipe 35, and a pressure sensor 32 connected to the air intake channel 24 through a third pipe 36, with the connection between the third pipe 36 and the air intake channel 24 located near the air inlet 21.

[0076] The connection between the third pipe 36 and the air intake channel 24 is at the front end of the air intake channel 24, and the connection between the second pipe 35 and the air intake channel 24 is at the rear end of the air intake channel 24. The negative pressure switch solenoid valve 31 disconnects the rear end of the air intake channel 24, which does not affect the pressure sensor 32 from detecting the gas pressure of the gas fuel supply device at the front end of the air intake channel 24.

[0077] Thus, the connection between the third pipe 36 and the air intake channel 24 is closer to the air inlet 21 than the connection between the second pipe 35 and the air intake channel 24, so that the pressure sensor 32 can still detect the gas pressure of the gas fuel supply device at the air inlet 21 after the negative pressure switch solenoid valve 31 cuts off the air intake channel 24.

[0078] According to some embodiments of this application, optionally, such as Figure 3 and Figure 4 As shown, the intake pipe 11 is located on one side of the oil inlet pipe 12, and the oil circuit switch solenoid valve 34 is located at the bottom of the carburetor 1.

[0079] This makes it easier to arrange the oil circuit switch solenoid valve 34.

[0080] According to some embodiments of this application, optionally, such as Figure 7As shown, the multi-fuel automatic switching device also includes a dual-fuel automatic switching base cup 4, which is installed on the carburetor 1. The dual-fuel automatic switching base cup 4 is provided with a gas inlet, which is connected to the outlet 22 of the pressure reducing valve 2 and the gas inlet is connected to the intake pipe 11.

[0081] Gas fuel and liquid fuel first pass through the dual-fuel automatic switching cup 4. The dual-fuel automatic switching cup 4 detects whether the gas fuel pressure is greater than the preset value. If the gas fuel pressure is greater than the preset value, the supply of liquid fuel is cut off and gas fuel is supplied to the carburetor. If the gas fuel pressure is lower than the preset value, the supply of gas fuel is cut off and liquid fuel is supplied to the carburetor.

[0082] The dual-fuel automatic switching bottom cup 4 can be set separately or installed on the carburetor 1 body. The structure and principle of the dual-fuel automatic switching bottom cup 4 are the technical solutions of the dual-fuel automatic switching oil and gas dual-use carburetor and its bottom cup disclosed in patent publication number CN108331680A. Its structure and principle will not be described in detail here.

[0083] Thus, by setting up a dual-fuel automatic switching cup 4, the dual-fuel automatic switching cup 4 automatically switches the fuel supply channel of the carburetor 1 by the pressure of the gas. This enables the mechanical control of the dual-fuel automatic switching cup 4 to automatically switch between gas and liquid fuel, while the pressure sensor 32 detects the electronic control of the automatic switching between gas and liquid fuel. Electronic equipment is prone to failure. When the pressure sensor 32 fails, the dual-fuel automatic switching cup 4 ensures the normal operation of the automatic switching device, playing a double insurance role.

[0084] According to some embodiments of this application, optionally, the dual-fuel automatic switching bottom cup 4 includes a housing, a needle valve assembly, a needle valve drive assembly, and a gas control assembly. The needle valve assembly, needle valve drive assembly, and gas control assembly are disposed in the housing. The housing is provided with a float chamber. The oil inlet pipe 12 is connected to the float chamber. The needle valve assembly is used to control the opening and closing of the oil circuit between the float chamber and the carburetor 1. The needle valve drive assembly is used to drive the needle valve assembly by the pressure of the gas.

[0085] In this way, liquid fuel enters the float chamber, and the needle valve assembly controls the opening and closing of the oil passage between the float chamber and carburetor 1. The needle valve drive assembly drives the needle valve assembly to control whether fuel is supplied to carburetor 1 by the pressure of gaseous fuel. When the pressure of gaseous fuel exceeds the preset value, the needle valve assembly closes the oil passage between the float chamber and carburetor 1, and gaseous fuel enters carburetor 1 normally. When the pressure of gaseous fuel is lower than the preset value, the needle valve assembly opens the oil passage between the float chamber and carburetor 1 and closes the gaseous fuel intake passage 24, and dual-fuel carburetor 1 is supplied with fuel normally and runs using gasoline.

[0086] According to some embodiments of this application, optionally, the negative pressure switch solenoid valve 31 is a normally closed solenoid valve, and the oil circuit switch solenoid valve 34 is a normally open solenoid valve; when the pressure sensor 32 detects that the gas pressure in the air inlet 21 exceeds a preset value, the oil circuit switch solenoid valve 34 closes the oil inlet pipe 12, and the negative pressure switch solenoid valve 31 opens the air inlet 21; when the pressure sensor 32 detects that the gas pressure in the air inlet 21 is lower than a preset value, the oil circuit switch solenoid valve 34 opens the oil inlet pipe 12, and the negative pressure switch solenoid valve 31 closes the air inlet 21.

[0087] Thus, under normal circumstances, the dual-fuel carburetor 1 receives fuel normally and runs on gasoline; the negative pressure switch solenoid valve 31 can close the air intake port 21 and open the fuel inlet pipe 12 when the gaseous fuel pressure is relatively low, to prevent gaseous fuel from entering the carburetor 1 and to avoid the occurrence of fuel-air mixture combustion, which could lead to abnormal engine operation.

[0088] This embodiment also relates to an engine, including a multi-fuel automatic switching device as described in any of the above.

[0089] In this embodiment, the engine can close the air inlet 21 and open the fuel inlet pipe 12 when the gaseous fuel pressure is relatively low by using the negative pressure switch solenoid valve 31. This prevents gaseous fuel from entering the carburetor 1 and avoids the occurrence of fuel-air mixture combustion, which could lead to abnormal engine operation.

[0090] Finally, it should be noted that although the above embodiments have been described in the text and drawings of this application, this should not limit the scope of patent protection of this application. Any technical solutions that are based on the essential concept of this application and utilize the content described in the text and drawings of this application, resulting in equivalent structural or procedural substitutions or modifications, as well as the direct or indirect application of the technical solutions of the above embodiments to other related technical fields, are all included within the scope of patent protection of this application.

Claims

1. A multi-fuel automatic switching device, characterized in that, include: A carburetor, which is mounted on an engine and is provided with an intake manifold and a fuel inlet manifold; A pressure reducing valve, wherein the pressure reducing valve is provided with an air inlet and an air outlet, the air outlet being connected to the air inlet pipe via a first pipe; and The control module includes a negative pressure switch solenoid valve, a pressure sensor, a controller, and a fuel line switch solenoid valve. The negative pressure switch solenoid valve and the pressure sensor are mounted on the pressure reducing valve. The negative pressure switch solenoid valve is connected to and controls the opening and closing of the air inlet. The fuel line switch solenoid valve is mounted on the fuel inlet pipe of the carburetor and is connected to and controls the opening and closing of the fuel inlet pipe. The pressure sensor is connected to the air inlet and detects the gas pressure at the air inlet. The pressure sensor is electrically connected to the controller and transmits the gas pressure data at the air inlet to the controller. The controller controls the negative pressure switch solenoid valve and the oil circuit switch solenoid valve based on the gas pressure data at the air inlet.

2. The multi-fuel automatic switching device according to claim 1, characterized in that, The negative pressure switch solenoid valve is connected to the air inlet through a second pipe, and the pressure sensor is connected to the air inlet through a third pipe.

3. The multi-fuel automatic switching device according to claim 2, characterized in that, The second pipe is located to the left of the air inlet, and the third pipe is located to the right of the air inlet.

4. The multi-fuel automatic switching device according to claim 3, characterized in that, The air inlet extends along a first direction, and the air outlet extends along a second direction, wherein the first direction and the second direction are perpendicular to each other.

5. The multi-fuel automatic switching device according to claim 3, characterized in that, The pressure reducing valve includes an air inlet channel, with the air inlet located at the end of the air inlet channel. The negative pressure switch solenoid valve is connected to the air inlet channel via a second pipe, and the pressure sensor is connected to the air inlet channel via a third pipe. The connection point of the third pipe to the air inlet channel is located near the air inlet.

6. The multi-fuel automatic switching device according to claim 1, characterized in that, The air intake pipe is located on one side of the fuel inlet pipe, and the fuel circuit switch solenoid valve is located at the bottom of the carburetor.

7. The multi-fuel automatic switching device according to claim 1, characterized in that, The multi-fuel automatic switching device also includes a dual-fuel automatic switching base cup, which is installed on the carburetor. The dual-fuel automatic switching base cup is provided with a gas inlet, which is connected to the outlet of the pressure reducing valve and the gas inlet is connected to the intake pipe.

8. The multi-fuel automatic switching device according to claim 7, characterized in that, The dual-fuel automatic switching base cup includes a housing, a needle valve assembly, a needle valve drive assembly, and a gas control assembly. The needle valve assembly, needle valve drive assembly, and gas control assembly are disposed within the housing. The housing is provided with a float chamber, and the fuel inlet pipe is connected to the float chamber. The needle valve assembly is used to control the opening and closing of the fuel circuit between the float chamber and the carburetor. The needle valve drive assembly is used to drive the needle valve assembly by the pressure of the gas.

9. The multi-fuel automatic switching device according to claim 1, characterized in that, The negative pressure switch solenoid valve is a normally closed solenoid valve, and the oil circuit switch solenoid valve is a normally open solenoid valve. When the pressure sensor detects that the gas pressure in the air inlet exceeds a preset value, the oil circuit switch solenoid valve closes the oil inlet pipe, and the negative pressure switch solenoid valve opens the air inlet. When the pressure sensor detects that the gas pressure in the air inlet is lower than a preset value, the oil circuit switch solenoid valve opens the oil inlet pipe, and the negative pressure switch solenoid valve closes the air inlet.

10. An engine, characterized in that, include: The multi-fuel automatic switching device as described in any one of claims 1 to 9.

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