A multi-fuel switching switch

Abstract

This utility model discloses a multi-fuel switching switch, including a valve core and a valve housing. The valve housing has a liquid control chamber and a gas control chamber. The liquid control chamber is connected to an oil inlet pipe and an oil outlet pipe, and the gas control chamber is connected to an air inlet pipe and an air outlet pipe. The valve core includes an inner core and an outer core that rotate simultaneously. The outer core is sealed to the gas control chamber and has a connecting plate that is slidably connected to the air inlet end of the air outlet pipe. The connecting plate has a first air hole and a second air hole. The inner core is connected to the liquid control chamber and has a rotating plate that is slidably connected to both the oil outlet end of the oil inlet pipe and the oil inlet end of the oil outlet pipe. The rotating plate has an oil inlet hole and an oil outlet hole. This multi-fuel switching switch improves upon existing designs by modifying the structure of the valve housing and valve core. The existing top-bottom layout is replaced with an inner-outer layout for the valve housing. Combined with the improved valve core structure, this significantly reduces the axial dimension of the entire switching switch, facilitating its layout and installation on generator sets.

Description

Technical Field

[0001] This utility model relates to the field of fuel switch technology for generator sets, and in particular to a multi-fuel switching switch. Background Technology

[0002] Dual-fuel generators (gasoline / oil) are a type of generator set that offers advantages such as low pollution, low fuel consumption, sufficient power, and easy portability. When using a dual-fuel generator, either natural gas (or liquefied petroleum gas) or oil (gasoline) can be selected as the power source. This requires switching between the various fuel lines of the dual-fuel generator.

[0003] Currently, commercially available switching switches can switch between fuel lines without shutting them off, allowing dual-fuel generators to select between gasoline, natural gas (NG), or liquefied petroleum gas (LPG). For example, patent application CN202222941160.9, entitled "A Three-Fuel Switch for a Generator Set," illustrates this design. The switch includes a valve body and a valve core. The valve core is housed within the valve body, which contains an inlet pipe, an outlet pipe, an oil inlet pipe, and an oil outlet pipe. Rotation of the valve core within the valve body connects the inlet and outlet pipes while disconnecting the oil inlet and outlet pipes, thus enabling the feeding of gaseous fuel. Alternatively, rotation of the valve core within the valve body disconnects the inlet and outlet pipes while connecting the oil inlet and outlet pipes, enabling the feeding of liquid fuel. This achieves the goal of multi-fuel control with a single switching switch.

[0004] In the aforementioned patent, the valve body is divided into upper and lower layers. The lower layer is the control area for liquid fuel, and the upper layer is the control area for gaseous fuel. The valve core runs through both layers of the valve body and is also divided into upper and lower sections to achieve zoned control. This layout increases the axial dimension of the entire switch and requires it to avoid components such as the electrical box and engine, which severely limits the switch's placement on the generator set. Utility Model Content

[0005] To address the shortcomings of existing technologies, this utility model provides a multi-fuel switching switch. The layout of the valve housing has been improved by adopting a structure with two cavities, and the valve core has also been structurally improved by dividing it into an inner core and an outer core to adapt to the structure of the valve housing. This allows for the control of the feed of natural gas or fuel oil, thereby reducing the axial dimension of the entire switch and facilitating its layout and installation on generator sets.

[0006] To achieve the above objectives, this utility model adopts the following technical solution: a multi-fuel switching switch, comprising a valve core and a valve housing rotatably connected.

[0007] The valve body has an inner and outer liquid control chamber and a gas control chamber. The liquid control chamber is connected to an oil inlet pipe and an oil outlet pipe, and the gas control chamber is connected to an air inlet pipe and an air outlet pipe.

[0008] The valve core consists of an inner core and an outer core that rotate simultaneously.

[0009] The outer core is at least partially inserted into the gas control chamber and sealed to the gas control chamber. The outer core is provided with a connecting plate that is slidably connected to the gas inlet end of the gas outlet pipe. The connecting plate is provided with at least a first gas hole. The outer core is rotated so that the first gas hole communicates with the gas outlet pipe, which is used to export the gas in the gas inlet pipe from the gas outlet pipe.

[0010] The inner core is at least partially inserted into the liquid control chamber and sealed to the liquid control chamber. The inner core is provided with a rotating plate that slides in sealed contact with both the oil outlet end of the oil inlet pipe and the oil inlet end of the oil outlet pipe. The rotating plate is provided with an oil inlet hole and an oil outlet hole. The inner core rotates so that the oil inlet hole communicates with the oil inlet pipe and the oil outlet hole communicates with the oil outlet pipe, so as to discharge the fuel in the oil inlet pipe from the oil outlet pipe.

[0011] In this configuration, either natural gas or fuel oil flows through the valve body in a single flow, or neither natural gas nor fuel oil flows through the valve body.

[0012] Compared with the prior art, the present invention has the following beneficial effects:

[0013] The multi-fuel changeover switch of this application improves the structure of the valve body and valve core based on the existing design. The existing top-bottom layout is redesigned into an inner-outer layout valve body. Combined with the improvement of the valve core structure, the axial dimension of the entire changeover switch can be significantly shortened, which is beneficial to the layout and installation of the changeover switch on the generator set.

[0014] Furthermore, the valve housing includes a detachably connected housing and a cover.

[0015] The upper end of the shell is open, and an annular surrounding plate protruding upward is provided at the bottom of the shell, so that the inner cavity of the shell is divided into an inner liquid control cavity and an outer gas control cavity.

[0016] The intake pipe is connected to the side wall of the housing, the exhaust pipe is connected to the bottom of the housing, and both the oil inlet and outlet pipes are connected to the bottom of the housing.

[0017] Furthermore, the inner wall of the shell has a cylindrical connecting section, the upper part of the outer core has an installation section that mates with the connecting section, the installation section and the connecting section are sealed and rotatably connected, the middle part of the outer core is located in the gas control chamber and has a chamber that communicates with the air inlet pipe, the bottom of the outer core has an inwardly recessed groove, the surrounding plate is located in the groove, the bottom of the outer core is a connecting plate, the connecting plate is provided with a first air hole and a second air hole, both of which communicate with the chamber.

[0018] Furthermore, the inner wall of the enclosure has a cylindrical fixed section, and the fixed section and the connecting section are arranged on the same axis. The inner core is located inside the enclosure and has a rotating section that cooperates with the fixed section. The fixed section and the rotating section are sealed and rotatably connected. The upper part of the inner core is connected to the bottom of the groove. The bottom of the inner core is a rotating plate. The oil inlet and oil outlet on the rotating plate are connected in the liquid control chamber.

[0019] Furthermore, the inner core has an upper plate and a lower plate spaced apart. The upper plate and the bottom plate are connected by a connecting part so that the inner core and the surrounding plate form a liquid inlet chamber and a liquid outlet chamber. The liquid inlet chamber and the liquid outlet chamber are connected by multiple connecting holes. The liquid inlet chamber is connected to the oil inlet hole, and the liquid outlet chamber is connected to the oil outlet hole.

[0020] Furthermore, a rotation limiting element is provided between the inner core and / or the outer core and the valve body to limit the rotation angle between the valve core and the valve body.

[0021] Furthermore, the limiting component includes a limiting protrusion and an arc-shaped limiting groove. The limiting protrusion slides relative to the limiting groove and contacts both ends of the limiting groove to limit the rotation angle of the limiting protrusion or the limiting groove.

[0022] Furthermore, the top of the outer core extends out of the valve housing and is connected to a rotating handle;

[0023] A pneumatic microswitch and an oil microswitch are provided between the rotating handle or the outer core and the valve body. The rotation of the outer core and the rotating handle triggers the pneumatic microswitch or the oil microswitch.

[0024] Furthermore, the outer core or rotating handle is provided with a trigger cam, which has a protrusion and a recess. The trigger cam rotates with the outer core and the rotating handle to trigger the air circuit micro switch or the oil circuit micro switch.

[0025] Furthermore, an adjusting limiter is provided between the valve core and the valve body to determine the rotation angle of the outer core and the inner core within the valve body. Attached Figure Description

[0026] Figure 1 This is an exploded structural diagram of a multi-fuel switch in this utility model;

[0027] Figure 2 This is a schematic diagram of the multi-fuel switch in this utility model;

[0028] Figure 3 This is a top view of the multi-fuel switch in this utility model;

[0029] Figure 4 for Figure 3 Sectional view along line AA;

[0030] Figure 5 for Figure 3 Sectional view along the BB line;

[0031] Figure 6 This is a schematic diagram of the structure of the housing and each of the first sealing rings in this utility model;

[0032] Figure 7 for Figure 6 A structural diagram from another perspective;

[0033] Figure 8 This is a schematic diagram of the structure of the inner core and the third sealing ring in this utility model.

[0034] Figure 9 for Figure 8 A structural diagram from another perspective;

[0035] Figure 10 This is a schematic diagram of the structure of the outer core and the second sealing ring in this utility model.

[0036] Figure 11 for Figure 10 A structural diagram from another perspective;

[0037] Figure 12 This diagram shows the various states of the handle when the multi-fuel switch of this invention is turned.

[0038] In the diagram: Valve housing 100, housing 110, surrounding plate 111, oil inlet pipe 112, oil outlet pipe 113, air outlet pipe 114, air inlet pipe 115, connecting groove 116, first sealing ring 117, housing cover 120, connecting lug 121, gas control chamber 130, liquid control chamber 140, valve core 200, outer core 210, upper annular plate 211, mounting part 212, connecting plate 213, vent hole 14, support plate 215, recessed groove 216, recessed groove 217, connecting post 218, second sealing ring 219, second vent 2111, first vent 21 12. Chamber 2113, Inner core 220, Connecting part 221, Upper plate 222, Rotating plate 223, Oil inlet hole 224, Connecting hole 225, Annular groove 226, Insert block 227, Third sealing ring 228, Liquid inlet chamber 229, Liquid outlet chamber 2210, Oil outlet hole 2212, Trigger cam 310, Air circuit micro switch 320, Oil circuit micro switch 330, Adjusting limit component 400, Limiting hole 410, Elastic limit steel ball 420, Limiting post 421, Rotation limit component 500, Limiting protrusion 510, Limiting groove 520, Rotating handle 600. Detailed Implementation

[0039] The technical solutions of the present utility model will be clearly and completely described below with reference to the accompanying drawings of the embodiments of the present utility model. Obviously, the described embodiments are only some embodiments of the present utility model, and not all embodiments.

[0040] like Figure 1-11As shown, a multi-fuel switching switch includes a valve core 200 and a valve housing 100 rotatably connected. The valve housing 100 has a liquid control chamber 140 and a gas control chamber 130 disposed inside and outside. The liquid control chamber 140 is connected to an oil inlet pipe 112 and an oil outlet pipe 113, and the gas control chamber 130 is connected to an air inlet pipe 115 and an air outlet pipe 114. The valve core 200 includes an inner core 220 and an outer core 210 that rotate simultaneously. The outer core 210 is at least partially inserted into the gas control chamber 130 and sealed to the gas control chamber 130. The outer core 210 is provided with a connecting plate 213 that is slidably connected to the air inlet end of the air outlet pipe 114 in a sealed contact. The connecting plate 213 has at least one first air hole 2112. The outer core 210 rotates to make the first air hole 2112... 112 is connected to the exhaust pipe 114 and is used to discharge the gas in the intake pipe 115 from the exhaust pipe 114; the inner core 220 is at least partially inserted into the liquid control chamber 140 and is sealed to the liquid control chamber 140. The inner core 220 is provided with a rotating plate 223 that is in sealed contact with both the oil outlet end of the oil inlet pipe 112 and the oil inlet end of the oil outlet pipe 113. The rotating plate 223 is provided with an oil inlet hole 224 and an oil outlet hole 2212. The inner core 220 rotates so that the oil inlet hole 224 is connected to the oil inlet pipe 112 and the oil outlet hole 2212 is connected to the oil outlet pipe 113, and is used to discharge the fuel in the oil inlet pipe 112 from the oil outlet pipe 113; wherein, the gas and fuel flow separately in the valve body 100, or neither gas nor fuel flows in the valve body 100.

[0041] Understandably, the valve housing 100 can have any structure, such as being square or cylindrical. Its inner cavity can be divided into two areas, inner and outer, by an annular partition plate. Theoretically, either the inner or outer area of ​​the valve housing 100 can be used for fuel conduction, and the other area can be used for gas conduction. However, given that fuel requires less conversion space, the inner area of ​​the valve housing 100 is used for fuel control. Therefore, the inner layer of the valve housing 100 is a liquid control chamber 140, and the outer layer is a gas control chamber 130.

[0042] The liquid control chamber 140 and the gas control chamber 130 can have cylindrical and annular structures, respectively. With an inner core 220 and an outer core 210 of matching structures within the corresponding chambers, synchronous rotation of the inner core 220 and outer core 210 is possible. Furthermore, by defining the positions of the feed holes on the inner core 220 and outer core 210, a specific rotation angle can be ensured, allowing for fuel feeding, oil feeding, or no feeding of either gas or oil. The liquid control chamber 140 and the gas control chamber 130 can also have cylindrical and annular partial structures, respectively, enabling synchronous rotation of the inner core 220 and outer core 210 to control the fuel type.

[0043] The oil inlet pipe 112 and oil outlet pipe 113 can be connected to either the side wall or the bottom of the liquid control chamber 140, which can be achieved with the inner core 220 structure. The rotation of the inner core 220 connects the oil inlet pipe 112 and oil outlet pipe 113 within the liquid control chamber 140, thus enabling fuel feeding. Similarly, the air inlet pipe 115 and air outlet pipe 114 can be connected to either the side wall or the bottom of the gas control chamber 130, which can be achieved with the outer core 210 structure. The rotation of the outer core 210 connects the air inlet pipe 115 and air outlet pipe 114 within the gas control chamber 130, thus enabling gas feeding.

[0044] The overall principle of the switching switch in this application is the same as that of existing multi-fuel switching switches, both utilizing the rotation of the valve core 200 at different angles to connect different fuel channels and achieve different fuel feeding. However, this application improves the structure of the valve housing 100 and the valve core 200, designing the existing top-bottom layout as an inner-outer layout for the valve housing 100. Combined with the improved structure of the valve core 200, the axial dimension of the entire switching switch can be significantly shortened, which is beneficial for the layout and installation of the switching switch on the generator set.

[0045] In some embodiments of this application, the valve housing 100 includes a detachably connected housing 110 and a housing cover 120. The housing 110 has an opening at its upper end, and an annular surrounding plate 111 protruding upwards is provided at the bottom of the housing 110, so that the inner cavity of the housing 110 is divided into an inner liquid control chamber 140 and an outer gas control chamber 130. The air inlet pipe 115 is connected to the side wall of the housing 110, the air outlet pipe 114 is connected to the bottom of the housing 110, and the oil inlet pipe 112 and the oil outlet pipe 113 are both connected to the bottom of the housing 110.

[0046] Understandably, to facilitate the installation of the valve core 200, this application configures the valve housing 100 as a detachably connected housing 110 and housing cover 120. The upper end of the housing 110 is open, and the housing cover 120 is located at the open end of the housing 110 and is detachably connected to the housing 110 by multiple bolts, etc. During installation, the valve core 200 is first installed inside the housing 110, and then the housing cover 120 and the housing 110 are connected, thus realizing the assembly of the valve housing 100 and the valve core 200. Based on the split structure of the valve housing 100, the valve core 200 is basically located inside the housing 110. Therefore, this application provides an annular surrounding plate 111 inside the housing 110. The surrounding plate 111 can adopt various structures, as long as the gap between the upper end of the surrounding plate 111 and the housing cover 120 is ensured to facilitate the rotation of the valve core 200. The bottom of the surrounding plate 111 is fixedly connected to the inner bottom of the housing 110, so that the surrounding plate 111 can divide the housing 110 into inner and outer cavities, adapting to fuel control and gas control.

[0047] Based on the layout of the enclosure 111 and the housing 110, the air inlet pipe 115, air outlet pipe 114, oil inlet pipe 112, and oil outlet pipe 113 can have various layout arrangements on the housing 110. For example, if both the air inlet pipe 115 and the air outlet pipe 114 are connected to the side wall of the housing 110, then when designing the outer core 210, it is only necessary to ensure that the connecting plate 213 slides along the inner wall of the housing 110 to seal the opening of the air inlet pipe 115. Alternatively, if the oil inlet pipe 112 and the oil outlet pipe 113 are respectively connected to the enclosure 111, it is only necessary to ensure that the oil inlet pipe 112 and the oil outlet pipe 113 can penetrate the housing 110 and communicate with the interior of the enclosure 111. Correspondingly, the rotating plate 223 of the inner core 220 can also be configured to have a structure that provides sealed sliding contact with the inner wall of the enclosure 111. In this application, considering the convenience of pipeline layout, the air inlet pipe 115 is connected to the side wall of the housing 110, the air outlet pipe 114 is connected to the bottom of the housing 110, and the oil inlet pipe 112 and the oil outlet pipe 113 are both connected to the bottom of the housing 110.

[0048] Specifically, such as Figure 1 , 2 As shown in Figures 3, 4, 5, 6, and 7, the valve body includes a detachable housing 110 and a cover 120. The housing 110 is a hollow cylindrical structure with an open top. The cover 120 is a circular structure. Four connecting ears 121 (at least two connecting ears 121 are acceptable) extend outwards around the cover 120. The four connecting ears 121 are evenly distributed around the cover 120. Four matching connecting grooves 116 are provided around the housing 110. Each connecting ear 121 mates with a connecting groove 116 and is detachably connected by bolts. Three of the four connecting grooves 116 are M4 threaded holes, and one is an M3 threaded hole, which prevents incorrect installation of the housing 110 and cover 120.

[0049] The enclosure 111 is a cylindrical structure. The upper end of the enclosure 111 is spaced apart from the shell cover 120, and the bottom of the enclosure 111 is fixed to the bottom of the shell 110. The axis of the enclosure 111 is collinear with the axis of the shell 110. The air inlet pipe 115 is connected to the side wall of the shell 110 and communicates with the gas control chamber 130, extending radially along the shell 110. The air outlet pipe 114 is located at the bottom of the shell 110 and communicates with the gas control chamber 130, extending axially along the shell 110. The oil inlet pipe 112 and the oil outlet pipe 113 are both connected to the bottom of the shell 110 and communicate with the liquid control chamber 140, extending axially. The oil inlet pipe 112 and the oil outlet pipe 113 have the same diameter and are located on opposite sides of the axis of the shell 110, symmetrically arranged along the axis.

[0050] To achieve a sealed fit between the oil inlet pipe 112, the oil outlet pipe 113, the air outlet pipe 114 and the corresponding components, the circumferentially recessed annular sealing grooves are provided at the connection ends of the oil inlet pipe 112, the oil outlet pipe 113, the air outlet pipe 114 and the housing 110 of this application. Each annular sealing groove is fitted with a first sealing ring 117, and the upper end of each first sealing ring 117 is slightly higher than the end height of the corresponding oil inlet pipe 112, oil outlet pipe 113 or air outlet pipe 114.

[0051] In the prior art, the valve core 200 controls the opening or closing of the intake pipe 115, while the outer core 210 of this application mainly controls the opening and closing of the exhaust pipe 114 and the gas control chamber 130. The intake pipe 115 is always connected to the gas control chamber 130, indicating that when switching to gaseous fuel, the gaseous fuel will enter the small pipe from a large space. According to Bernoulli's principle, in addition to increasing the flow rate, this layout also has the functions of "buffering, stabilizing and rectifying" the gas, making the gaseous fuel more stable when it is discharged from the exhaust pipe 114, and making the engine run more smoothly afterward.

[0052] In some embodiments of this application, the inner wall of the housing 110 has a cylindrical connecting section, the upper part of the outer core 210 has an installation section that mates with the connecting section, the installation section and the connecting section are sealed and rotatably connected, the middle part of the outer core 210 is located in the gas control chamber 130 and has a chamber 2113 that communicates with the air inlet pipe 115, the bottom of the outer core 210 has an inwardly recessed groove, the surrounding plate 111 is located in the groove, the bottom of the outer core 210 is a connecting plate 213, the connecting plate 213 is provided with a first air hole 2112 and a second air hole 2111, both of which communicate with the chamber 2113.

[0053] Understandably, the number of vents provided on the outer core 210 can be used to control various gaseous fuels. In this application, based on the commonly used gaseous fuels NG and LPG, a first vent 2112 and a second vent 2111 are provided on the outer core 210. The first vent 2112 and the second vent 2111 are either connected to the gas outlet pipe 114 or neither is connected.

[0054] The outer core 210 is at least partially inserted into and sealed to the gas control cavity 130. The outer core 210 needs to rotate within the gas control cavity 130. To achieve a sealed rotational connection between the outer core 210 and the gas control cavity 130, in fact, regardless of the structure of the housing 110, as long as the housing 110 has a cylindrical connecting section and the upper part of the outer core 210 has a mounting section that mates with the connecting section, and the mounting section has an annular recessed groove 217 with a sealing ring inside the recessed groove 217, a sealed rotational connection between the outer core 210 and the gas control cavity 130 can be achieved.

[0055] Since the connection between the air inlet pipe 115 and the air outlet pipe 114 is achieved only by rotating the rotating plate 223, it is necessary to ensure that at least the first air hole 2112 and the second air hole 2111 can be connected to the air inlet pipe 115. Therefore, a chamber 2113 connected to the gas control chamber 130 can be provided in the part of the outer core 210 located inside the gas control chamber 130. This chamber 2113 is connected to one end of the first air hole 2112 and one end of the second air hole 2111. When the other end of the first air hole 2112 or the other end of the second air hole 2111 is connected to the end of the air outlet pipe 114, the connection between the air inlet pipe 115 and the air outlet pipe 114 can be achieved.

[0056] Since a surrounding plate 111 is provided at the bottom of the housing 110, in order to avoid interference between the surrounding plate 111 and the outer core 210, an inwardly recessed groove needs to be provided at the bottom of the outer core 210 to accommodate the installation of the surrounding plate 111. Correspondingly, the bottom of the outer core 210 will mate with the bottom of the housing 110 (the bottom between the housing 110 and the surrounding plate 111). The opening of the vent pipe 114 is located at the bottom of the housing 110. Therefore, the bottom of the outer core 210 is equivalent to the connecting plate 213, and the first vent 2112 and the second vent 2111 will be opened at the bottom of the outer core 210.

[0057] Specifically, such as Figure 10 , 11 As shown, the outer core 210 is an integral structure. The outer core 210 has a cylindrical mounting part 212, an upper annular plate 211, and a lower annular plate arranged coaxially. The mounting part 212 is arranged coaxially with the housing 110. The upper annular plate 211 is sleeved on the outside of the mounting part 212 near the upper end of the mounting part 212 and fixed in the middle. The circumferential sidewall of the upper annular plate 211 is the mounting section. The middle of the mounting section is provided with an annular recessed groove 217. A second sealing ring 219 is provided in the recessed groove 217. The outer periphery of the second sealing ring 219 is in sealing contact with the inner wall of the housing 110. The lower end of the mounting part 212 is open, and the inner cavity of the mounting part 212 is a groove. The surrounding plate 111 is located inside the mounting part 212. The lower ring plate is connected and fixed to the lower opening end of the mounting part 212. The lower ring plate is a connecting plate 213. The first air hole 2112 and the second air hole 2111 are opened on the lower ring plate. The center of the first air hole 2112 and the center of the second air hole 2111 are located on the same circumference. The center of the air outlet pipe 114 is located on the projection of the circumference. The center of the circle is located on the axis of the mounting part 212. The lower ring plate, the mounting part 212 and the upper ring plate 211 constitute the chamber 2113 of the outer core 210. To increase the stability of the chamber 2113, multiple support plates 215 are provided inside the chamber 2113. The support plates 215 are connected to the lower ring plate, the mounting part 212, and the upper ring plate 211 respectively. To prevent the support plates 215 from affecting the airflow, each support plate 215 is provided with an air passage hole 14.

[0058] Figure 10 ,11 The outer core 210 shown can be with Figure 6 , 7 The housing 110 shown in the diagram can ensure that the air inlet pipe 115 is connected to the upper end of the first air hole 2112 and the upper end of the second air hole 2111. When the outer core 210 rotates, it drives the lower end of the first air hole 2112 or the lower end of the second air hole 2111 to connect with the upper end of the air outlet pipe 114, thereby realizing the connection between the air inlet pipe 115 and the air outlet pipe 114.

[0059] It is worth noting that, since the connecting plate 213 has a ring-shaped structure, and only one vent pipe 114 is provided at the bottom between the housing 110 and the surrounding plate 111, the first sealing ring 117 at the end of the vent pipe 114 will raise the connecting plate 213, creating a gap between the connecting plate 213 and the bottom of the housing 110. To ensure that the connecting plate 213 rotates more smoothly, such as Figure 5 , 6 As shown, an auxiliary mounting groove is provided at the bottom between the housing 110 and the surrounding plate 111. The auxiliary mounting groove and the opening of the air outlet pipe 114 are symmetrically arranged along the axial direction of the housing 110. A first sealing ring 117 is also provided in the auxiliary mounting groove to ensure that the connecting plate 213 rotates in sealed contact with the two first sealing rings 117.

[0060] The first vent 2112 and the second vent 2111 are used for the conduction of NG and LPG, respectively. Since the amount of air required for combustion of the two gases is different (i.e., with the same amount of air, the amount of LPG and natural gas that can be burned is different), their flow rates into the combustion chamber are different. Therefore, the diameters of the first vent 2112 and the second vent 2111 are unequal. Specifically, the first vent 2112 is used for conducting NG, and the second vent 2111 is used for conducting LPG; therefore, the diameter of the first vent 2112 is larger than that of the second vent 2111, and vice versa. Furthermore, the first vent 2112 and the second vent 2111 can be machined to the required diameter according to different power motors, resulting in better versatility.

[0061] In some embodiments of this application, the inner wall of the enclosure 111 has a cylindrical fixed section, and the fixed section and the connecting section are arranged coaxially. The inner core 220 is located inside the enclosure 111 and has a rotating section that cooperates with the fixed section. The fixed section and the rotating section are sealed and rotatably connected. The upper part of the inner core 220 is connected to the bottom of the groove. The bottom of the inner core 220 is a rotating plate 223. The oil inlet hole 224 and the oil outlet hole 2212 on the rotating plate 223 are connected in the liquid control chamber 140.

[0062] Understandably, based on the mating relationship between the outer core 210 and the housing 110, the connection relationship between the inner core 220 and the surrounding plate 111 also needs to be defined to ensure that the inner core 220 is at least partially inserted into the surrounding plate 111 and sealed to the surrounding plate 111. Therefore, regardless of the structure of the surrounding plate 111, as long as it is ensured that the inner wall of the surrounding plate 111 has a cylindrical fixed section, and the fixed section and the connecting section are arranged coaxially, the inner core 220 is located inside the surrounding plate 111 and has a rotating section that mates with the fixed section. Similarly, the rotating section is provided with an annular groove 226 in the axial direction, and a sealing ring is provided in the annular groove 226, so that a sealed rotating connection between the rotating section and the fixed section can be achieved. Correspondingly, since both the oil inlet pipe 112 and the oil outlet pipe 113 are located inside the enclosure 111 and connected to the bottom of the housing 110, the bottom of the inner core 220 is a rotating plate 223. The upper end of the oil inlet hole 224 and the upper end of the oil outlet hole 2212 on the rotating plate 223 are connected within the liquid control chamber 140. When the inner core 220 rotates, the lower end of the oil outlet hole 2212 is connected to the opening of the oil outlet pipe 113, and the lower end of the oil inlet hole 224 is connected to the inlet of the oil outlet pipe 113, thus enabling the connection between the oil outlet pipe 113 and the oil inlet pipe 112 for fuel supply.

[0063] In some embodiments of this application, the inner core 220 has an upper plate 222 and a lower plate spaced apart. The upper plate 222 and the bottom plate are connected by a connecting part 221 so that the inner core 220 and the surrounding plate 111 form a liquid inlet chamber 229 and a liquid outlet chamber 2210. The liquid inlet chamber 229 and the liquid outlet chamber 2210 communicate with each other through a plurality of connecting holes 225. The liquid inlet chamber 229 communicates with the oil inlet hole 224, and the liquid outlet chamber 2210 communicates with the oil outlet hole 2212.

[0064] Understandably, the upper end of the oil inlet 224 and the upper end of the oil outlet 2212 can be directly connected through the bent connecting cavity, which is equivalent to the structure in the prior art. At this time, the inner core 220 can adopt a columnar structure as a whole. When the inner core 220 rotates, it can realize fuel supply or shut-off.

[0065] In the existing structure, when the fuel passage is open, fuel enters from the inlet pipe 112 into the inlet hole 224 of the same diameter, then passes through the bent connecting cavity, and finally exits from the outlet pipe 113 of the same diameter. Since the fuel enters the bent connecting cavity instantaneously from the inlet pipe 112, the bent structure of the connecting cavity easily causes the fluid to form vortices on the outside of the bend (especially at high flow velocities). These vortices can cause local pressure fluctuations, increase fuel resistance, and easily lead to turbulent flow at the outlet. As a result, the existing structure has problems such as large fuel pressure loss and significant fluctuations when the fuel passage is open.

[0066] To address the aforementioned problems, this application provides an inner core 220 structure, specifically, as follows: Figure 1 , 4As shown in Figures 5, 8, and 9, the inner core 220 is an integral structure, including an upper plate 222 and a lower plate, which are coaxially arranged circular plates. The upper plate 222 is coaxially arranged with the housing 110 and the surrounding plate 111. The circumferential sidewall of the upper plate 222 is a rotating section, and an annular groove 226 is provided in the middle of the rotating section. A third sealing ring 228 is provided in the annular groove 226, and the outer periphery of the third sealing ring 228 is in sealing contact with the inner wall of the surrounding plate 111. A non-circular insertion block 227 is provided on the upper part of the upper plate 222. The insertion block 227 is inserted into the upper end of the inner cavity of the outer core 210 mounting part 212, so that the outer core 210 and the inner core 220 can rotate simultaneously. The lower plate is a rotating plate 223. The oil outlet 2212 and the oil inlet 224 are located on the lower plate and are symmetrical along the diameter of the lower plate. The projection of the center of the oil outlet 2212 and the center of the oil outlet pipe 113 are located on the same circumference of the same circle. The center of the circle is collinear with the axis of the surrounding plate 111 (lower plate). A connecting part 221 is provided between the upper plate 222 and the lower plate. The connecting part 221 is a plate-shaped or block-shaped structure. The connecting part 221 is arranged along the diameter direction of the upper plate 222, dividing the upper plate 222 and the lower plate into two parts. Since the inner core 220 is set inside the surrounding plate 111, the connecting part 221 can make the inner core 220 and the surrounding plate 111 form a liquid inlet chamber 229 and a liquid outlet chamber 2210. The liquid inlet chamber 229 and the liquid outlet chamber 2210 are connected through multiple connecting holes 225. The liquid inlet chamber 229 is connected to the oil inlet hole 224, and the liquid outlet chamber 2210 is connected to the oil outlet hole 2212.

[0067] When the inner core 220 of this application conducts fuel, the fuel instantly enters a larger inlet chamber 229 from the inlet pipe 112 through the inlet hole 224, then enters a larger outlet chamber 2210 through the connecting hole 225 of the small pipe, and then enters a small-diameter outlet hole 2212 from the outlet chamber 2210 before being supplied from the outlet pipe 113. Essentially, during fuel supply, the fluid first enters a large space A (inlet chamber 229) from a smaller pipe, then enters another large space B (outlet chamber 2210) through a smaller pipe (connecting hole 225), and finally exits through the smaller pipe. Spaces A and B act as "buffer chambers," absorbing flow disturbances (such as deflection and turbulence) in the inlet pipe. After fuel enters space A, the original turbulent energy is dissipated due to the sudden expansion of the diameter, and the flow becomes more stable. Multiple connecting holes 225 act as "rectifiers," allowing only stable laminar or weakly turbulent flow to pass through (the cross-sectional area of ​​the small holes is fixed, which can filter high-frequency fluctuations). After secondary stabilization in space B, the outlet flow is more uniform. At the same time, the improved fluid path makes the fuel flow state closer to "free flow," the pressure field distribution is more uniform, and there is almost no risk of periodic pulsation. This allows the inner core 220 structure of this application to effectively suppress fuel turbulence and pressure fluctuations when fuel is being supplied, achieving stable fuel supply and reducing engine wear.

[0068] Furthermore, due to the enlarged diameter design of spaces A and B, the fuel volume is reduced. If there are impurities in the fuel, they are more likely to settle due to gravity or inertia, reducing the risk of clogging the fuel outlet pipe 113. Even if a small amount of impurities pass through the connection hole 225, the enlarged volume of space B will reduce their impact on the outlet flow pattern, resulting in stronger overall anti-clogging capability.

[0069] In some embodiments of this application, a rotation limiting member 500 is provided between the inner core 220 and / or the outer core 210 and the valve housing 100 to limit the rotation angle between the valve core 200 and the valve housing 100.

[0070] Understandably, the switch needs to control the rotation of the valve core 200 during the switching process. The valve core 200 can achieve multi-position switching by rotating within a certain range. To limit the rotation angle of the valve core 200, a rotation limiter 500 can be set. Since the inner core 220 and outer core 210 are inserted and rotate simultaneously, limiting the rotation angle between the inner core 220 and / or the outer core 210 and the valve housing 100 will limit the overall rotation angle of the valve core 200 and the valve housing 100.

[0071] For example, the rotation limiting member 500 can be two rotating baffles, one on the outer core 210 and the other on the valve housing 100. The two rotating baffles are located on the rotation path of the rotating baffle. When the outer core 210 rotates, it drives the rotating baffle to rotate. The rotating baffle can only rotate in the area between the two rotating baffles. By the arrangement of the two rotating baffles, the rotation angle of the outer core 210 and the valve housing 100 can be limited. Correspondingly, the rotation angle of the inner core 220 and the valve housing 100 can be limited.

[0072] In some embodiments of this application, a rotation limiting member 500 structure is provided. The rotation limiting member 500 includes a limiting protrusion 510 and an arc-shaped limiting groove 520. The limiting protrusion 510 slides relative to the limiting groove 520 and contacts both ends of the limiting groove 520 to limit the rotation angle of the limiting protrusion 510 or the limiting groove 520. Figure 1 , 5 As shown in Figures 6 and 8, this application provides a limiting protrusion 510 on the upper plate 222 of the inner core 220. The limiting protrusion 510 extends outward along the upper plate 222. The limiting groove 520 is an arc-shaped groove located at the upper end of the surrounding plate 111. The limiting protrusion 510 is located within the limiting groove 520 and slides with the limiting groove 520. When the limiting protrusion 510 contacts both ends of the limiting groove 520, the rotation of the inner core 220 and the outer core 210 relative to the valve housing 100 can be limited. In this application, the rotation angle of the inner core 220 and the outer core 210 along the housing 110 is limited to 145°.

[0073] In some embodiments of this application, the top of the outer core 210 extends out of the valve housing 100 and is connected to a rotating handle 600; a pneumatic micro switch 320 and an oil micro switch 330 are provided between the rotating handle 600 or the outer core 210 and the valve housing 100, and the outer core 210 and the rotating handle 600 rotate to trigger the pneumatic micro switch 320 or the oil micro switch 330.

[0074] Understandably, to achieve the rotation of the valve core 200, at least part of the structure of the outer core 210 or inner core 220 must be outside the valve housing 100 to facilitate the rotation of the valve core 200. In this application, since the inner core 220 is embedded at the bottom of the outer core 210, the top of the outer core 210 is extended out of the housing cover 120. To achieve the linkage control between the changeover switch and the carburetor, a pneumatic microswitch 320 and an oil microswitch 330 are provided between the rotating handle 600 or the outer core 210 and the valve housing 100. The rotation of the outer core 210 and the rotating handle 600 triggers the pneumatic microswitch 320 or the oil microswitch 330.

[0075] like Figure 1 , 4 As shown in Figure 5, the upper end of the mounting part 212 is provided with an upwardly extending connecting post 218. The connecting post 218 passes through the mounting hole on the housing cover 120 and is located outside the valve housing 100. The rotating handle 600 is located above the connecting post 218 and fixed to the connecting post 218. The pneumatic micro switch 320 and the oil micro switch 330 are fixed above the housing cover 120. The trigger ends of the pneumatic micro switch 320 and the oil micro switch 330 respectively cooperate with the trigger structure on the connecting post 218 to ensure that the rotation of the outer core 210 and the rotating handle 600 can trigger the pneumatic micro switch 320 or the oil micro switch 330.

[0076] In some embodiments of this application, the outer core 210 or the rotating handle 600 is provided with a trigger cam 310. The trigger cam 310 has a protrusion and a recess. The trigger cam 310 rotates with the outer core 210 and the rotating handle 600, causing the protrusion to rotate, for triggering the pneumatic micro switch 320 or the oil micro switch 330. Figure 1 , 2 As shown in Figure 4, the trigger cam 310 is fixed to the connecting post 218. When the protrusion and recess on the trigger cam 310 rotate with the outer core 210, they will cooperate with the spring of the air circuit micro switch 320 or the oil circuit micro switch 330 in sequence to trigger the air circuit micro switch 320 or the oil circuit micro switch 330.

[0077] In some embodiments of this application, an adjusting limit member 400 is provided between the valve core 200 and the valve housing 100 to determine the rotation angle of the outer core 210 and the inner core 220 within the valve housing 100.

[0078] To limit the rotation angle of the valve core 200 and ensure the control of the oil or air circuit by the outer core 210 and inner core 220, this application provides an adjusting limit member 400 between the valve core 200 and the valve housing 100. Specifically, as shown... Figure 1 As shown, the adjusting limiter 400 is disposed between the upper annular plate 211 of the shell cover 120 and the outer core 210. The adjusting limiter 400 includes at least one elastic limiting steel ball 420 and multiple limiting holes 410. The elastic limiting steel ball 420 is located inside the fixed limiting post 421 at the bottom of the shell cover 120. A spring (not shown in the figure) is provided inside the limiting post 421 to allow the elastic limiting steel ball 420 to extend and retract at the end of the limiting post 421. An annular groove 216 is provided at the top of the upper annular plate 211. Multiple limiting holes 410 are all located in the groove 216 and are arranged in a ring along the axis of the upper annular plate 211. The number and spacing angle of the multiple limiting holes 410 are adapted to the layout of the air outlet pipe 114, the first air hole 2112, the second air hole 2111, the oil inlet hole 224, the oil outlet hole 2212, the oil inlet pipe 112, and the oil outlet pipe 113. In this application, two elastic limiting steel balls 420 and eight matching limiting holes 410 are provided. Any limiting hole 410 adjacent to the elastic limiting steel ball 420 will match the elastic limiting steel ball 420 when the outer core 210 rotates 45°.

[0079] Combination Figure 1-11 The structure of the multi-fuel switch is as follows: During installation, the inner core 220 is first embedded in the enclosure 111 and sealed to the inner wall of the enclosure 111. Then, the outer core 210 is embedded in the housing 110, and the outer core 210 and the inside of the housing 110 are sealed to each other. Then, the cover 120 is fitted over the connecting post 218 of the outer core 210 (rotation limiter 500 is in place). The cover 120 is connected to the upper end of the housing 110. The trigger cam 310 is fitted over the connecting post 218. Then, the micro switch is fixed. Finally, the rotating handle 600 and the connecting post 218 are fixed to complete the assembly of the entire switch.

[0080] Based on the switching structure shown in the illustration of this application, the operating principle of this application is as follows:

[0081] 1. When the handle is rotated to 600 degrees, place it on top. Figure 12 When in the middle (1) position, the oil inlet 224 and oil outlet 2212 of the inner core 220 are offset from the oil inlet pipe 112 and oil outlet pipe 113 of the valve body 100, respectively; the first air hole 2112 and the second air hole 2111 of the outer core 210 are offset from the air outlet pipe 114 of the valve body 100. At this time, the oil circuit and the air circuit are disconnected, and the trigger cam 310 has no contact with the oil circuit micro switch 330 and the air circuit micro switch 320.

[0082] 2. When the handle is turned 600 degrees, rotate it 45 degrees clockwise. Figure 12When in the middle (2) position, the oil inlet 224 and oil outlet 2212 of the inner core 220 are aligned with the oil inlet pipe 112 and oil outlet pipe 113 of the valve body 100, respectively; the first air hole 2112 and the second air hole 2111 of the outer core 210 are offset from the air outlet pipe 114 of the valve body 100; at this time, the oil circuit is connected and the air circuit is disconnected, the trigger cam 310 contacts the oil circuit micro switch 330 and disconnects from the air circuit micro switch 320.

[0083] 3. When the handle is turned 600 degrees and then rotated 45 degrees (a total of 90 degrees), it reaches... Figure 12 When in position (3), the oil inlet 224 and oil outlet 2212 of the inner core 220 are offset from the oil inlet pipe 112 and oil outlet pipe 113 of the valve housing 100, respectively; the first air hole 2112 of the outer core 210 is aligned with the air outlet pipe 114 of the valve housing 100, and the second air hole 2111 of the outer core 210 is offset from the air outlet pipe 114 of the valve housing 100; at this time, NG is turned on, the oil circuit and LPG are disconnected, the trigger cam 310 contacts the air circuit micro switch 320 and disconnects from the oil circuit micro switch 330.

[0084] 4. When the handle is turned 600 degrees and then rotated 45 degrees (a total of 135 degrees), it reaches... Figure 12 In position (4), the oil inlet 224 and oil outlet 2212 of the inner core 220 are offset from the oil inlet pipe 112 and oil outlet pipe 113 of the valve housing 100, respectively; the second air hole 2111 of the outer core 210 is aligned with the air outlet pipe 114 of the valve housing 100, and the first air hole 2112 of the outer core 210 is offset from the air outlet pipe 114 of the valve housing 100. At this time, LPG is turned on, the oil circuit and NG are disconnected, the trigger cam 310 is still in contact with the air circuit micro switch 320, and is still disconnected from the oil circuit micro switch 330.

[0085] Due to the limiting effect between the inner core 220 and the valve housing 100, the handle can only be rotated counterclockwise 135° to return to the starting position. Figure 12 Middle (1) position.

[0086] The multi-fuel switching switch of this application, compared with the prior art:

[0087] 1. The multi-fuel switch of this application has a smaller axial dimension, making the switch layout on the generator set more convenient, and the overall appearance is simple, compact, beautiful and elegant.

[0088] 2. The multi-fuel switch inlet and outlet ports 2212 and the inlet and outlet ports of the present application have a more scientific layout, and the pipeline connection is not messy.

[0089] 3. The multi-fuel switch of this application has strong versatility. By only changing the orifice diameter of the valve core 200 (first air hole 2112, second air hole 2111, oil inlet hole 224 and oil outlet hole 2212), it can be used for generators of different power. Furthermore, depending on the number of openings in the valve core 200 (only the first air hole 2112 is opened or both the first air hole 2112 and the second air hole 2111 are opened), it can be used as a dual-fuel switch or a tri-fuel switch.

[0090] 4. The inner core 220 structure of the multi-fuel switch in this application enables more stable fuel supply and less engine power loss.

[0091] 5. The multi-fuel switch of this application is designed with gas inlet and outlet passages in mind, which can make gas supply more stable and reduce engine power loss.

[0092] In this utility model, unless otherwise explicitly specified and limited, the terms "installation," "connection," "joining," and "fixing," etc., should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral part; they can refer to a mechanical connection or an electrical connection; they can refer to a direct connection or an indirect connection through an intermediate medium; they can refer to the internal communication of two components or the interaction between two components. Those skilled in the art can understand the specific meaning of the above terms in this utility model according to the specific circumstances.

[0093] In the description of this utility model, it should be noted that the terms "center," "upper," "lower," "left," "right," "inner," and "outer," etc., indicate the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings, or the orientation or positional relationship commonly used when the product of this utility model is in use. They are only for the convenience of describing this utility model and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation. Therefore, they should not be construed as limitations on this utility model. In addition, the terms "first," "second," etc., are only used to distinguish descriptions and should not be construed as indicating or implying relative importance.

[0094] It will be apparent to those skilled in the art that this invention is not limited to the details of the exemplary embodiments described above, and that it can be implemented in other specific forms without departing from the spirit or essential characteristics of this invention. Therefore, the embodiments should be considered illustrative and non-limiting in all respects, and the scope of this invention is defined by the appended claims rather than the foregoing description. Thus, it is intended that all variations falling within the meaning and scope of equivalents of the claims be included within this invention. No reference numerals in the claims should be construed as limiting the scope of the claims.

Claims

1. A multi-fuel switch, characterized by: Includes a valve core (200) and a valve body (100) that are rotatably connected. The valve body (100) has a liquid control chamber (140) and a gas control chamber (130) arranged inside and outside. The liquid control chamber (140) is connected to an oil inlet pipe (112) and an oil outlet pipe (113), and the gas control chamber (130) is connected to an air inlet pipe (115) and an air outlet pipe (114). The valve core (200) includes an inner core (220) and an outer core (210) that rotate simultaneously. The outer core (210) is at least partially inserted into the gas control chamber (130) and sealed to the gas control chamber (130). The outer core (210) is provided with a connecting plate (213) that is slidably connected to the inlet end of the gas outlet pipe (114). The connecting plate (213) is provided with at least a first gas hole (2112). The outer core (210) is rotated so that the first gas hole (2112) communicates with the gas outlet pipe (114) to export the gas in the inlet pipe (115) from the gas outlet pipe (114). The inner core (220) is at least partially inserted into the liquid control chamber (140) and sealed to the liquid control chamber (140). The inner core (220) is provided with a rotating plate (223) that is in sealed contact with the oil outlet end of the oil inlet pipe (112) and the oil inlet end of the oil outlet pipe (113). The rotating plate (223) is provided with an oil inlet hole (224) and an oil outlet hole (2212). The inner core (220) rotates so that the oil inlet hole (224) communicates with the oil inlet pipe (112) and the oil outlet hole (2212) communicates with the oil outlet pipe (113), which is used to discharge the fuel in the oil inlet pipe (112) from the oil outlet pipe (113). In this configuration, either natural gas or fuel oil flows through the valve housing (100) in a single flow, or neither natural gas nor fuel oil flows through the valve housing (100).

2. The multi-fuel switch according to claim 1, characterized in that: The valve housing (100) includes a detachably connected housing (110) and a cover (120). The upper end of the housing (110) is open, and an annular surrounding plate (111) protruding upward is provided at the bottom of the inner side of the housing (110) so that the inner cavity of the housing (110) is divided into an inner liquid control cavity (140) and an outer gas control cavity (130). The air inlet pipe (115) is connected to the side wall of the housing (110), the air outlet pipe (114) is connected to the bottom of the housing (110), and the oil inlet pipe (112) and the oil outlet pipe (113) are both connected to the bottom of the housing (110).

3. The multi-fuel switcher switch of claim 2, wherein: The inner wall of the shell (110) has a cylindrical connecting section, and the upper part of the outer core (210) has an installation section that mates with the connecting section. The installation section and the connecting section are sealed and rotatably connected. The middle part of the outer core (210) is located in the gas control chamber (130) and has a chamber (2113) that communicates with the air inlet pipe (115). The bottom of the outer core (210) has an inwardly recessed groove, and the surrounding plate (111) is located in the groove. The bottom of the outer core (210) is a connecting plate (213). The connecting plate (213) is provided with a first air hole (2112) and a second air hole (2111). Both the first air hole (2112) and the second air hole (2111) communicate with the chamber (2113).

4. The multi-fuel switch according to claim 3, characterized in that: The inner wall of the enclosure (111) has a cylindrical fixing section, and the fixing section and the connecting section are arranged coaxially. The inner core (220) is located inside the surrounding plate (111) and has a rotating section that cooperates with the fixed section. The fixed section and the rotating section are connected in a sealed rotational manner. The upper part of the inner core (220) is connected to the bottom of the groove. The bottom of the inner core (220) is a rotating plate (223). The oil inlet hole (224) and the oil outlet hole (2212) on the rotating plate (223) are connected in the liquid control chamber (140).

5. The multi-fuel switcher switch of claim 4, wherein: The inner core (220) has an upper plate (222) and a lower plate spaced apart. The upper plate (222) and the bottom plate are connected by a connecting part (221) so that the inner core (220) and the surrounding plate (111) form an inlet chamber (229) and an outlet chamber (2210). The inlet chamber (229) and the outlet chamber (2210) are connected by multiple connecting holes (225). The inlet chamber (229) is connected to the oil inlet hole (224), and the outlet chamber (2210) is connected to the oil outlet hole (2212).

6. The multi-fuel switcher switch of claim 1, 2, 3, 4, or 5, wherein: A rotation limiter (500) is provided between the inner core (220) and / or the outer core (210) and the valve housing (100) to limit the rotation angle between the valve core (200) and the valve housing (100).

7. The multi-fuel switcher switch of claim 6, wherein: The rotation limiter (500) includes a limit protrusion (510) and an arc-shaped limit groove (520). The limit protrusion (510) slides relative to the limit groove (520) and contacts both ends of the limit groove (520) to limit the rotation angle of the limit protrusion (510) or the limit groove (520).

8. The multi-fuel switcher switch of claims 1, 2, 3, 4, 5, or 7, wherein: The top of the outer core (210) extends out of the valve housing (100) and is connected to a rotating handle (600); A pneumatic microswitch (320) and an oil microswitch (330) are provided between the rotating handle (600) or the outer core (210) and the valve body (100). The outer core (210) and the rotating handle (600) rotate to trigger the pneumatic microswitch (320) or the oil microswitch (330).

9. The multi-fuel switcher switch of claim 8, wherein: The outer core (210) or the rotating handle (600) is provided with a trigger cam (310). The trigger cam (310) has a protrusion and a recess. The trigger cam (310) rotates with the outer core (210) and the rotating handle (600) to trigger the air circuit micro switch (320) or the oil circuit micro switch (330).

10. The multi-fuel switcher switch of claims 1, 2, 3, 5, 7, or 9, wherein: An adjusting limiter (400) is provided between the valve core (200) and the valve housing (100) to determine the rotation angle of the outer core (210) and the inner core (220) within the valve housing (100).

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