Patent Publication Number: US-2023143603-A1

Title: Multi-fuel switching device

Description:
CROSS-REFERENCE TO RELATED APPLICATION 
     This application claims the priority benefit of China application serial no. 202111316899.4, filed on Nov. 9, 2021. The entirety of the above-mentioned patent application is hereby incorporated by reference herein and made a part of this specification. 
     BACKGROUND 
     Technical Field 
     The disclosure relates to a fuel switching device, in particular to a multi-fuel switching device. 
     Description of Related Art 
     Existing internal combustion engines generally use a liquid fuel and a gas fuel when using multiple fuels. The switching between the liquid fuel and the gas fuel is generally implemented through a fuel switching device, and specifically through switching to turn off corresponding switches disposed on two fuel pipelines. When the internal combustion engine needs to use three or more fuels and contains two or more gas fuels, how to enable the internal combustion engine to implement the optimal working state is a technical issue to be solved. 
     SUMMARY 
     The disclosure provides a multi-fuel switching device to solve the issue that a fuel switching device in the prior art cannot adapt to three or more fuels, which causes an internal combustion engine to be unable to achieve the optimal working state. 
     In order to achieve the above objective, the basic solution of the disclosure provides a multi-fuel switching device, which includes a gas part. The gas part includes a switching valve. The switching valve includes a housing having an air inlet and an air outlet. A valve core is rotatably set within the housing and located between the air inlet and the air outlet. The valve core is provided with a first airway and a second airway. Cross-sectional sizes of the first airway and the second airway are different. The first airway or the second airway is selected through rotating the valve core to connect the air inlet and the air outlet. 
     The beneficial effect of the basic solution is that by adopting such setting, when switching between two gas fuels, the first airway or the second airway is correspondingly selected through rotating the valve core to connect the air inlet and the air outlet, so that the internal combustion engine can maintain the optimal working state when using different gas fuels. Moreover, the setting enables operators to maintain the optimal working state of the internal combustion engine by only performing a simple switching operation. At the same time, the setting has a simple structure, which is beneficial to reducing costs. 
     Further, the valve core is provided with an inlet opposite to the air inlet. The inlet extends along a direction of a rotating shaft of the valve core. The first airway and the second airway are both connected to the inlet. By adopting such setting, the structure of the valve core is conveniently simplified, thereby facilitating processing and manufacturing and reducing costs. 
     Further, a contour of a region of the valve core between an end of the first airway away from the inlet and an end of the second airway away from the inlet is greater than a contour of the air outlet. By adopting such setting, when the valve core is rotated such that the region of the valve core between the first airway and the second airway is opposite to the air outlet, the air outlet is covered and shielded, thereby implementing disconnection between the air inlet and the air outlet to implement simultaneous cutting off of two gas fuels, which is convenient for operation. 
     Further, the housing is rotatably connected to a rotating shaft. The rotating shaft is statically connected to the valve core. The rotating shaft is statically connected to a position feedback device. By adopting such setting, a position state to which the rotating shaft drives the valve core to rotate may be known in time through the position feedback device, thereby conveniently ensuring the accuracy of a rotating position of the valve core. 
     Further, the position feedback device includes a spinning part. The spinning part is provided with an elastic abutting part. The housing is statically connected to an alignment part cooperating with the elastic abutting part. By adopting such setting, the structure of the position feedback device is simple, which is beneficial to improving reliability. 
     Further, the alignment part has a groove shape. The elastic abutting part includes a steel ball slidably cooperating with the spinning part and a spring driving the steel ball. 
     Further, a liquid fuel switch is also included. The liquid fuel switch is rotatably linked with the valve core. By adopting such setting, a liquid fuel and the two gas fuels may be simultaneously switched through rotating the valve core, which is beneficial to simplifying the structure and improving the convenience of operation. 
     Further, the liquid fuel switch has a feeding nozzle and a discharging nozzle. The liquid fuel switch also includes a rotating part linked with a rotating shaft. The rotating part is located between the feeding nozzle and the discharging nozzle. The rotating part is provided with a fuel channel that implements connection between the feeding nozzle and the discharging nozzle through rotating the rotating part. 
     Further, a solenoid valve and a solenoid valve switch that control connection and disconnection of a main jet of a carburetor are also included. A protruding part linked with the rotating shaft and enabled to touch the solenoid valve switch is also included. By adopting such setting, connection and disconnection of fuel supply to the carburetor may be synchronously controlled through rotating the valve core, thereby facilitating operation. 
     Further, a flameout switch located at a side of the rotating shaft is also included. A flameout boss linked with the rotating shaft and used to trigger the flameout switch is also included. By adopting such setting, the objective of controlling flameout is conveniently achieved through rotating the rotating shaft, thereby facilitating operation. 
     Further, the housing is connected to an ignition angle control switch. A bump linked with the valve core and cooperating with the ignition angle control switch is also included. By adopting such setting, the ignition angle control switch is triggered by the bump when the valve core rotates, so that when different fuels are used, engine power loss caused by using different fuels is avoided through controlling the ignition time. 
    
    
     
       BRIEF DESCRIPTION OF THE DRAWINGS 
         FIG.  1    is a schematic view of a multi-fuel switching device according to an embodiment of the disclosure. 
         FIG.  2    is an A-A cross-sectional view in  FIG.  1   . 
         FIG.  3    is a B-B cross-sectional view in  FIG.  1   . 
         FIG.  4    is a top view of a state when a fuel channel of a rotating part in  FIG.  2    is connected to a feeding nozzle and a discharging nozzle. 
         FIG.  5    is a schematic view of a state when the fuel channel of the rotating part in  FIG.  4    is disconnected from the feeding nozzle and the discharging nozzle. 
         FIG.  6    is a schematic view of positions of a solenoid valve switch, a flameout switch, and a rotating shaft. 
         FIG.  7    is a schematic view when an alignment part on a housing in  FIG.  1    is set to multiple positions. 
     
    
    
     DETAILED DESCRIPTION OF DISCLOSED EMBODIMENTS 
     The following is further described in detail through a specific embodiment. 
     Reference numerals in the drawings include housing  1 , flameout switch  2 , solenoid valve switch  3 , valve core  4 , rotating shaft  5 , rotating part  8 , spinning part  9 , spring  9   a , steel ball  9   b , alignment part  10 , air inlet  11 , air outlet  12 , feeding nozzle  15 , fuel channel  16 , discharging nozzle  17 , first airway  41 , second airway  42 , inlet  43 , protruding part  51 , flameout boss  52 , ignition angle control switch  53 , first gas fuel position C, shut-down flameout position O, fuel-off flame-on position S, second gas fuel position N, and liquid fuel position F. 
     The embodiment is basically as shown in  FIG.  1    to  FIG.  7   . A multi-fuel switching device includes a gas part. The gas part includes a switching valve. The switching valve includes a housing  1  having an air inlet  11  and an air outlet  12 . In the embodiment, the center line of the air inlet  11  and the center line of the air outlet  12  are perpendicular to each other. A valve core  4  is rotatably set within the housing and located between the air inlet  11  and the air outlet  12 . The valve core  4  is provided with a first airway  41  and a second airway  42 . The first airway  41  and the second airway  42  are both disposed along a direction of a rotating shaft  5  perpendicular to the valve core  4 . Cross-sectional sizes of the first airway  41  and the second airway  42  are different. The first airway  41  or the second airway  42  is selected through rotating the valve core  4  to connect the air inlet  11  and the air outlet  12 . The valve core  4  is provided with an inlet  43  opposite to the air inlet  11 . The inlet  43  extends along the direction of the rotating shaft  5  of the valve core  4 , so that the valve core  4  always keeps the inlet  43  connected to the air inlet  11  when spinning. The first airway  41  and the second airway  42  are both connected to the inlet  43 , so that the first airway  41  and the second airway  42  are distributed in a V-shape. On the valve core  4 , a contour of a region of the valve core  4  located between an end of the first airway  41  away from the inlet  43  and an end of the second airway  42  away from the inlet  43  is greater than a contour of the air outlet  12 , so that the region of the valve core  4  can cover and seal the air outlet  12  to cut off gas fuel. 
     The housing  1  is rotatably connected to the rotating shaft  5 . The rotating shaft  5  is statically connected with the valve core  4 . In the embodiment, the valve core  4  is provided with an elongated groove. An end part of the rotating shaft  5  is provided with a block cooperating with the elongated groove. Synchronous rotation of the rotating shaft  5  and the valve core  4  is implemented through fitting the block into the groove. The rotating shaft  5  is statically connected with a position feedback device. In the embodiment, the position feedback device includes a spinning part  9  fixedly connected with the rotating shaft  5 . The spinning part  9  is provided with an elastic abutting part. The elastic abutting part includes a steel ball  9   b  slidably cooperating with the spinning part  9  in a radial direction of the rotating shaft  5  and a spring  9   a  driving the steel ball  9   b . The housing  1  is statically connected with an alignment part  10  cooperating with the elastic abutting part. In the embodiment, the alignment part  10  has a groove structure integrally formed with the housing  1 . The alignment of a rotating position of the rotating shaft  5  can be implemented through fitting the steel ball  9   b  of the elastic abutting part into the alignment part  10 , so that the valve core  4  stays in a corresponding position. 
     The housing  1  is connected to a liquid fuel switch. The liquid fuel switch has a feeding nozzle  15  and a discharging nozzle  17 . The liquid fuel switch also includes a rotating part  8  linked with the rotating shaft  5 . In the embodiment, the rotating part  8  preferably has a disk shape, the rotating part  8  is coaxially and integrally formed with the rotating shaft  5 , the rotating part  8  is located between the feeding nozzle  15  and the discharging nozzle  17 , and the rotating part  8  is provided with a fuel channel  16  that implements connection between the feeding nozzle  15  and the discharging nozzle  17  through rotating the rotating part  8 . In order to improve structural integrity and assembly convenience, the liquid fuel switch and the switching valve share the housing  1 , and the liquid fuel switch is disposed between the position feedback device and the valve core  4 . 
     The carburetor is provided with a solenoid valve. The housing  1  is installed with a solenoid valve switch  3  on a side of the rotating shaft  5  for controlling the solenoid valve to connect or disconnect the carburetor main jet. The rotating shaft  5  is provided with a protruding part  51  in contact with the solenoid valve switch  3 . The housing  1  is also installed with a flameout switch  2  on the side of the rotating shaft  5 . The rotating shaft  5  is provided with a flameout boss  52  for triggering the flameout switch  2 . The housing  1  is also installed with an ignition angle control switch  53  on the side of the rotating shaft  5 . The valve core  4  is linked with a bump cooperating with the ignition angle control switch  53 . In the embodiment, for the convenience of connection, the bump is disposed on the rotating shaft  5 , thereby implementing linkage between the bump and the valve core  4 . The bump is spinned by a certain angle through rotating the rotating shaft  5 , so that a corresponding ignition signal can be implemented in a case where different fuels are used, thereby advancing or delaying ignition corresponding to different fuels. In order to ensure the accurate rotation of the valve core  4  to the corresponding position, the alignment part  10  of the position feedback device is set into multiple groove structures, which respectively correspond to a liquid fuel position F, a first gas fuel position C, a second gas fuel position N, a fuel-off flame-on position S, and a shut-down flameout position O. 
     The specific use process is as follows. When an internal combustion engine uses a liquid fuel mode, the protruding part  51  contacts the solenoid valve switch  3 , so that the solenoid valve connect the fuel supply between the carburetor fuel bowl and main jet. At the same time, the fuel channel  16  on the rotating part  8  connects the feeding nozzle  15  and the discharging nozzle  17 , and the first airway  41  and the second airway  42  on the valve core  4  are both not connected to the air inlet  11  and the air outlet  12 , so that fuel in the carburetor may enter the internal combustion engine for combustion. When the internal combustion engine is switched from the liquid fuel mode to a gas fuel mode, the rotating shaft  5  is rotated to separate the protruding part  51  from the solenoid valve switch  3 , so that the solenoid valve cut off the fuel supply from the carburetor fuel bowl to main jet. At the same time, the rotating part  8  is rotated along with the rotating shaft  5  to disconnect the feeding nozzle  15  and the discharging nozzle  17 , so that the first airway  41  or the second airway  42  on the valve core  4  connects the air inlet  11  and the air outlet  12  (the specific airway for connection is selected according to the type of the gas fuel). At this time, the ignition angle control switch  53  disposed on the side of the rotating shaft  5  is triggered by the bump. The ignition angle control switch  53  identifies the fuel used by the internal combustion engine through a rotation angle of the rotating shaft, and then selects a corresponding ignition angle based on the used fuel. 
     The above is only the embodiment of the disclosure, and common knowledge such as conventional specific structures and characteristics in the solution are not overly described here. It should be pointed out that for persons skilled in the art, on the premise of not departing from the structure of the disclosure, several modifications and improvements may also be made, which should also be regarded as being within the protection scope of the disclosure and will not affect the effect of the implementation of the disclosure and the utility of the patent.