Multi-fuel change-over switch

Abstract

The multi-fuel change-over switch comprises a valve element and a valve shell, the valve shell is provided with a liquid control cavity and a gas control cavity, the liquid control cavity is communicated with an oil inlet pipe and an oil outlet pipe, and the gas control cavity is communicated with a gas inlet pipe and a gas outlet pipe; the valve core comprises an inner core and an outer core which rotate simultaneously, the outer core is sealed with the gas control cavity, the outer core is provided with a connecting plate which is in sealed contact and sliding connection with the gas inlet end of the gas outlet pipe, and the connecting plate is provided with a first gas hole and a second gas hole; the inner core is connected with the liquid control cavity, a rotating plate which is in sealed contact sliding with the oil outlet end of the oil inlet pipe and the oil inlet end of the oil outlet pipe is arranged on the inner core, and an oil inlet hole and an oil outlet hole are formed in the rotating plate. According to the multi-fuel change-over switch, on the basis of an existing multi-fuel change-over switch, the structures of the valve shell and the valve element are improved, an existing vertical layout mode is designed into the valve shell of an internal and external layout structure, the axial size of the whole change-over switch can be greatly shortened in combination with the improvement of the valve element structure, and layout and installation of the change-over switch on a generator set are facilitated.

Description

Technical Field

[0001] The present invention relates to the technical field of fuel switches for generator sets, and in particular to a multi-fuel switching switch. Background Art

[0002] Gas / oil dual-fuel generators are a type of generator set with advantages such as low pollution, low fuel consumption, sufficient power, and easy portability. When using a dual-fuel generator, you can choose between gas (natural gas, liquefied petroleum gas) or oil (gasoline) as the power source. To do this, you need to switch the fuel lines of the dual-fuel generator.

[0003] Currently, corresponding switching switches designed on the market can realize the non-closing switching of various fuel pipelines, meeting the feeding selection of gasoline, natural gas (NG), or liquefied petroleum gas (LPG) for dual-fuel generators. As shown in the patent application number CN202222941160.9, entitled "A Three-Fuel Switch for Generator Sets", the switching switch includes a valve body and a valve core. The valve core is arranged in the valve body, and the valve body is respectively provided with an air inlet pipe, an air outlet pipe, an oil inlet pipe, and an oil outlet pipe. The valve core rotates in the valve body, so that the air inlet pipe and the air outlet pipe are connected, and the oil inlet pipe and the oil outlet pipe are disconnected, thereby realizing the feeding of gas fuel; the valve core rotates in the valve body, so that the air inlet pipe and the air outlet pipe are disconnected, and the oil inlet pipe and the oil outlet pipe are connected, thereby realizing the feeding of liquid fuel, thereby achieving the purpose of realizing multi-fuel control with a switching switch.

[0004] In the aforementioned patent, the valve body is divided into two layers: the lower layer controls the liquid fuel, and the upper layer controls the gas fuel. The valve core extends through both layers and is also divided into two sections, enabling zoned control. This layout increases the axial size of the entire switch, requiring it to avoid components such as the electrical box and the engine, which greatly limits the switch's placement on the generator set. Summary of the Invention

[0005] In response to the shortcomings of the prior art, the present invention provides a multi-fuel switching switch, which improves the layout of the valve housing and adopts a structure with two inner and outer cavities. At the same time, the valve core is structurally improved and divided into an inner core and an outer core to adapt to the structure of the valve housing. It is used to realize the feed control of gas or fuel, thereby reducing the axial size of the entire switch and facilitating the layout and installation of the switch on the generator set.

[0006] To achieve the above object, the present invention adopts the following technical solution: a multi-fuel switching switch, comprising a valve core and a valve housing that are rotatably connected,

[0007] The valve housing has a liquid control chamber and a gas control chamber arranged inside and outside. 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 is sealed and connected to the gas control chamber. The outer core is provided with a connecting plate that is in sealing contact and sliding connection with the gas inlet end of the gas outlet pipe. The connecting plate is provided with a first gas hole and a second gas hole. The outer core rotates to connect the first gas hole or the second gas hole with the gas outlet pipe, so as to discharge the gas in the gas inlet pipe out of the gas outlet pipe.

[0010] The inner core is at least partially inserted into the liquid control chamber and is sealedly connected to the liquid control chamber. The inner core is provided with a rotating plate that is in sealing contact and sliding 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 to connect the oil inlet hole with the oil inlet pipe and the oil outlet hole with the oil outlet pipe, so as to discharge the fuel in the oil inlet pipe from the oil outlet pipe.

[0011] The gas and the fuel oil circulate in the valve housing alone, or the gas and the fuel oil do not circulate in the valve housing.

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

[0013] The multi-fuel switching switch of the present application improves the structure of the valve housing and valve core on the existing basis, and designs the existing upper and lower layout into a valve housing with an inside and outside layout structure. Combined with the improvement of the valve core structure, the axial dimension of the entire switching switch can be greatly shortened, which is beneficial to the layout and installation of the switching switch on the generator set.

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

[0015] The upper end of the shell is open, and an upwardly protruding annular enclosure 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 air inlet pipe is connected to the side wall of the shell, the air outlet pipe is connected to the bottom of the shell, and the oil inlet pipe and the oil outlet pipe are both connected to the bottom of the shell.

[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 cooperates with the connecting section, the installation section is sealed and rotatably connected to the connecting section, the middle part of the outer core is located in the gas control chamber and has a chamber connected to the air intake pipe, the bottom of the outer core has an inwardly concave groove, the enclosure is located in the groove, the bottom of the outer core is a connecting plate, and the first air hole and the second air hole on the connecting plate are both connected to the chamber.

[0018] Furthermore, the inner wall of the enclosure has a cylindrical fixed section, and the fixed section and the connecting section are coaxially arranged. 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 holes on the rotating plate are arranged to communicate in the liquid control chamber.

[0019] Furthermore, the inner core has an upper plate and a lower plate arranged at intervals, and 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 cavity and a liquid outlet cavity, and the liquid inlet cavity and the liquid outlet cavity are connected through multiple connecting holes, the liquid inlet cavity is connected to the oil inlet hole, and the liquid outlet cavity is connected to the oil outlet hole.

[0020] Furthermore, a rotation limiter is provided between the inner core and / or the outer core and the valve housing to limit the rotation angle of the valve core and the valve housing.

[0021] Furthermore, the limiting member 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] An air circuit micro switch and an oil circuit micro switch are arranged between the rotating handle or the outer core and the valve housing. The outer core and the rotating handle rotate to trigger the air circuit micro switch or the oil circuit micro switch.

[0024] Furthermore, a trigger cam is provided on the outer core or the rotating handle. The trigger cam has a protrusion and a recessed portion. The trigger cam rotates with the outer core and the rotating handle to cause the protrusion to rotate, thereby triggering 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 housing to determine the rotation angle of the outer core and the inner core in the valve housing. BRIEF DESCRIPTION OF THE DRAWINGS

[0026] Figure 1 This is a schematic diagram of an explosion structure of a multi-fuel switch in the present invention;

[0027] Figure 2 This is a schematic structural diagram of the multi-fuel switch in the present invention;

[0028] Figure 3 A top view of the multi-fuel switch of the present invention;

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

[0030] Figure 5 for Figure 3 Cross-sectional view along the midline BB;

[0031] Figure 6 This is a schematic structural diagram of the cooperation between the housing and each first sealing ring in the present invention;

[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 the present invention;

[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 the present invention;

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

[0037] Figure 12 1 is a diagram showing various states of the handle when the multi-fuel switch of the present invention is in use.

[0038] In the figure: valve housing 100, housing 110, enclosure 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 ear 121, gas control chamber 130, liquid control chamber 140, valve core 200, outer core 210, upper annular plate 211, mounting portion 212, connecting plate 213, air hole 14, support plate 215, sinking groove 216, recessed groove 217, connecting column 218, second sealing ring 219, second air hole 2111, first air hole 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, plug-in 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, adjustment limiter 400, limit hole 410, elastic limit steel ball 420, limit column 421, rotation limiter 500, limit protrusion 510, limit groove 520, rotating handle 600. DETAILED DESCRIPTION

[0039] The technical solutions in the embodiments of the present invention will be clearly and completely described below in conjunction with the drawings in the embodiments of the present invention. Obviously, the described embodiments are only part of the embodiments of the present invention, rather than all the embodiments.

[0040] like Figure 1-11As shown, a multi-fuel switching switch includes a valve core 200 and a valve housing 100 that are rotatably connected. The valve housing 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 is sealed and connected to the gas control chamber 130. The outer core 210 is provided with a connecting plate 213 that is in sealing contact and sliding connection with the air inlet end of the air outlet pipe 114. The connecting plate 213 is provided with at least a first air hole 2112. The outer core 210 rotates to allow the first air hole 220 to rotate. 112 is communicated with the air outlet pipe 114, and is used to guide the gas in the air inlet pipe 115 out of the air outlet pipe 114; the inner core 220 is at least partially inserted in the liquid control chamber 140 and is sealed with the liquid control chamber 140, and the inner core 220 is provided with a rotating plate 223 that is in sealing contact and sliding with the oil outlet end of the oil inlet pipe 112 and the oil inlet end of the oil outlet pipe 113, and the rotating plate 223 is provided with an oil inlet hole 224 and an oil outlet hole 2212. The inner core 220 rotates to make the oil inlet hole 224 communicate with the oil inlet pipe 112 and the oil outlet hole 2212 communicate with the oil outlet pipe 113, and is used to guide the fuel in the oil inlet pipe 112 out of the oil outlet pipe 113; wherein, the gas and fuel circulate alone in the valve housing 100, or the gas and fuel do not circulate in the valve housing 100.

[0041] It is understandable that the valve housing 100 can be of any structure, such as a square or cylindrical shape as a whole, and its inner cavity can be divided into two inner and outer areas by an annular partition plate. In theory, either of the inner and outer areas of the valve housing 100 can be used for the conduction of fuel, and the other area is used for the conduction of gas. However, given that the conversion space required for fuel is smaller, the inner area of the valve housing 100 is used to control the fuel. For this purpose, 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 overall structures of the liquid control chamber 140 and the gas control chamber 130 can be cylindrical and annular, respectively. By disposing matching inner and outer cores 220 and 210 within the corresponding cavities, synchronized rotation of the inner and outer cores 220 and 210 can be achieved. Furthermore, by defining the positions of the feed holes on the inner and outer cores 220 and 210, a specific rotation angle can be ensured, enabling the feeding of either fuel or fuel oil, or neither fuel or fuel oil. The cylindrical and annular structures of the liquid control chamber 140 and the gas control chamber 130, respectively, can also achieve synchronized rotation of the inner and outer cores 220 and 210, allowing for control of fuel type.

[0043] The oil inlet pipe 112 and the oil outlet pipe 113 can be connected to the side wall or the bottom of the liquid control chamber 140 by simply cooperating with the inner core 220. The inner core 220 rotates to connect the oil inlet pipe 112 and the oil outlet pipe 113 in the liquid control chamber 140, thereby achieving the function of fuel feeding. Similarly, the air inlet pipe 115 and the air outlet pipe 114 can be connected to the side wall or the bottom of the gas control chamber 130 by simply cooperating with the outer core 210. The outer core 210 rotates to connect the air inlet pipe 115 and the air outlet pipe 114 in the gas control chamber 130, thereby achieving the function of gas feeding.

[0044] The overall principle of the diverter switch in this application is identical to that of existing multi-fuel diverter switches: both utilize valve core 200 to rotate at different angles to connect to different fuel channels and enable the feeding of different fuels. However, this application improves the structure of valve housing 100 and valve core 200, replacing the existing top-bottom layout with an inside-outside layout of valve housing 100. Combined with the improved structure of valve core 200, this significantly reduces the axial dimension of the entire diverter switch, facilitating its layout and installation on a generator set.

[0045] In some embodiments of the present application, the valve housing 100 includes a shell 110 and a shell cover 120 that are detachably connected. The upper end of the shell 110 is open, and an upwardly protruding annular enclosure 111 is provided at the bottom of the shell 110 to divide the inner cavity of the shell 110 into an internal liquid control chamber 140 and an external gas control chamber 130; wherein, the air inlet pipe 115 is connected to the side wall of the shell 110, the air outlet pipe 114 is connected to the bottom of the shell 110, and the oil inlet pipe 112 and the oil outlet pipe 113 are both connected to the bottom of the shell 110.

[0046] As can be understood, to facilitate the installation of the valve core 200, the present application provides the valve housing 100 with a detachably connected shell 110 and shell cover 120. The upper end of the shell 110 is open, and the shell cover 120 is located at the open end of the shell 110 and is detachably connected to the shell 110 by a plurality of bolts. During installation, the valve core 200 is first installed in the shell 110, and then the shell cover 120 and the shell 110 are connected to complete 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 in the shell 110. To this end, the present application provides an annular enclosure 111 in the shell 110. The enclosure 111 can adopt a variety of structures. It is only necessary to ensure that a gap is set between the upper end of the enclosure 111 and the shell cover 120 to facilitate the rotation of the valve core 200. The bottom of the enclosure 111 is fixedly connected to the inner bottom of the shell 110, so that the enclosure 111 can divide the shell 110 into two inner and outer chambers, suitable for fuel control and gas control.

[0047] Based on the layout of the enclosure 111 and the shell 110, the air inlet pipe 115, the air outlet pipe 114, the oil inlet pipe 112 and the oil outlet pipe 113 can have a variety of layouts on the shell 110. For example, if the air inlet pipe 115 and the air outlet pipe 114 are both connected to the side wall of the shell 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 shell 110 and can seal and slide the pipe opening of the air inlet pipe 115. For another example, 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 pass through the shell 110 and then communicate with the inside of the enclosure 111. Correspondingly, the rotating plate 223 of the inner core 220 is also configured to be in 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 shell 110, the air outlet pipe 114 is connected to the bottom of the shell 110, and the oil inlet pipe 112 and the oil outlet pipe 113 are both connected to the bottom of the shell 110.

[0048] Specifically, such as Figure 1 、 2 As shown in Figures 3, 4, 5, 6, and 7, the valve body includes a detachable shell 110 and a shell cover 120. The shell 110 is a hollow cylindrical structure with an open top, and the shell cover 120 is a circular structure. Four outwardly extending connecting ears 121 (at least two connecting ears 121 are acceptable) are provided around the shell cover 120. The four connecting ears 121 are evenly distributed around the shell cover 120. Four matching connecting grooves 116 are provided around the shell 110. Each connecting ear 121 cooperates with the connecting groove 116 and is detachably connected by bolts. Among them, three of the four connecting grooves 116 are M4 threaded holes and one is M3 threaded hole, which has a preventative effect on the installation of the shell 110 and the shell cover 120.

[0049] The enclosure 111 is a cylindrical structure, with a gap between its upper end and the housing cover 120. The bottom of the enclosure 111 is fixed to the bottom of the housing 110, and the axis of the enclosure 111 is collinear with the axis of the housing 110. An air inlet pipe 115 is connected to the sidewall of the housing 110 and communicates with the gas control chamber 130, extending radially along the housing 110. An air outlet pipe 114 is located at the bottom of the housing 110 and communicates with the gas control chamber 130, extending axially along the housing 110. Both the oil inlet pipe 112 and the oil outlet pipe 113 are connected to the bottom of the housing 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 housing 110 axis, symmetrically arranged along the axis.

[0050] In order to achieve the sealing cooperation between the oil inlet pipe 112, the oil outlet pipe 113, the air outlet pipe 114 and the corresponding components, the oil inlet pipe 112, the oil outlet pipe 113, the air outlet pipe 114 and the connecting end of the shell 110 of the present application are all provided with a downwardly recessed annular sealing groove in the circumference, and a first sealing ring 117 is clamped in each annular sealing groove, and the upper end of each first sealing ring 117 is slightly higher than the end height of the corresponding oil inlet pipe 112 or oil outlet pipe 113 or air outlet pipe 114.

[0051] The valve core 200 in the prior art controls the conduction or closure of the intake pipe 115, while the outer core 210 of the present application mainly controls the conduction and closure of the outlet 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 gas fuel, the gas fuel will enter the small pipe from a large space. According to Bernoulli's principle, this layout will not only increase the flow rate, but the large space will also have a "buffering, voltage stabilization, and rectification" effect on the gas, making the gas fuel more stable when it is discharged from the outlet pipe 114, making the subsequent use of the engine more stable.

[0052] In some embodiments of the present application, the inner wall of the shell 110 has a cylindrical connecting section, the upper part of the outer core 210 has an installation section that cooperates with the connecting section, the installation section is sealed and rotatably connected to the connecting section, 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 concave groove, the enclosure 111 is located in the groove, the bottom of the outer core 210 is a connecting plate 213, and the connecting plate 213 is provided with a first air hole 2112 and a second air hole 2111, and the first air hole 2112 and the second air hole 2111 are both communicated with the chamber 2113.

[0053] It can be understood that the number of air holes set on the outer core 210 can realize the control of multiple gas fuels. In this application, based on the commonly used gas fuels being NG and LPG, a first air hole 2112 and a second air hole 2111 are set on the outer core 210. The first air hole 2112 and the second air hole 2111 are either connected to the outlet pipe 114 or neither is connected.

[0054] The outer core 210 is at least partially plugged into the gas control chamber 130 and sealedly connected to the gas control chamber 130, and the outer core 210 needs to rotate in the gas control chamber 130. In order to achieve the sealed rotation connection between the outer core 210 and the gas control chamber 130, in fact, no matter what structure the shell 110 is, as long as it is ensured that a cylindrical connecting section is provided on the shell 110, the upper part of the outer core 210 has a mounting section that cooperates with the connecting section, an annular recessed groove 217 is provided on the mounting section, and a sealing ring is provided in the recessed groove 217, then the sealed rotation connection between the outer core 210 and the gas control chamber 130 can be achieved.

[0055] Since the connection between the air inlet pipe 115 and the air outlet pipe 114 is only achieved 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 that communicates with the gas control chamber 130 can be set in the part of the outer core 210 located in the gas control chamber 130. The 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 panel 111 is provided at the bottom of the shell 110, in order to avoid interference between the panel 111 and the outer core 210, an inwardly recessed groove needs to be provided at the bottom of the outer core 210 to cooperate with the installation of the panel 111. Correspondingly, the bottom of the outer core 210 will cooperate with the bottom of the shell 110 (the bottom between the shell 110 and the panel 111), and the mouth of the air outlet pipe 114 is located at the bottom of the shell 110. For this reason, the bottom of the outer core 210 is equivalent to the connecting plate 213, and the first air hole 2112 and the second air hole 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 integrated structure. The outer core 210 has a cylindrical mounting portion 212, an upper annular plate 211 and a lower annular plate with colinear axes. The mounting portion 212 is coaxially arranged with the shell 110; the upper annular plate 211 is sleeved on the outside of the mounting portion 212 near the upper end of the mounting portion 212 and fixed to the middle part, and the circumferential side wall of the upper annular plate 211 is the mounting section; an annular recessed groove 217 is provided in the middle of the mounting section, and 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 shell 110. The lower end of the mounting portion 212 is open, the inner cavity of the mounting portion 212 is a groove, and the enclosure 111 is located in the mounting portion 212; the lower circular ring plate is connected and fixed to the lower open end of the mounting portion 212, the lower circular ring plate is a connecting plate 213, the first air hole 2112 and the second air hole 2111 are opened on the lower circular ring plate, and the center of the first air hole 2112 and the center of the second air hole 2111 are located on the circumference of the same circle, and the center of the air outlet pipe 114 is located on the projection of the circumference of the circle, and the center of the circle is located on the axis of the mounting portion 212; the lower circular ring plate, the mounting portion 212 and the upper circular ring plate 211 constitute the chamber 2113 of the outer core 210. In order to increase the stability of the chamber 2113, multiple support plates 215 are provided in the chamber 2113. The support plates 215 are respectively connected to the lower circular plate, the mounting portion 212, and the upper circular plate 211. In order to prevent the support plates 215 from affecting the fluid of the airflow, an air hole 14 is provided on each support plate 215.

[0058] Figure 10 、11 The outer core 210 shown can be Figure 6 、 7 The shell 110 shown in the figure can ensure that the air inlet pipe 115 is connected with 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 communicate 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 is a circular plate structure, and there is only one air outlet pipe 114 at the bottom between the shell 110 and the enclosure 111, the first sealing ring 117 provided at the end of the air outlet pipe 114 will lift the connecting plate 213, so that there is a gap between the connecting plate 213 and the bottom of the shell 110. In order to ensure that the connecting plate 213 is more stable during rotation, as shown in FIG. Figure 5 、 6 As shown, an auxiliary mounting groove is also provided at the bottom between the shell 110 and the enclosure 111. The auxiliary mounting groove and the pipe opening of the air outlet pipe 114 are symmetrically arranged along the axis of the shell 110. A first sealing ring 117 is also provided in the auxiliary mounting groove to ensure that the connecting plate 213 rotates in sealing contact on the two first sealing rings 117.

[0060] The first and second air holes 2112 and 2111 are used to conduct NG and LPG, respectively. Because the two gases require different amounts of air for combustion—that is, with the same amount of air, different amounts of liquefied petroleum gas and natural gas can be burned—their flow rates into the combustion chamber are therefore different. Therefore, the diameters of the first and second air holes 2112 and 2111 are different. If the first air hole 2112 conducts NG and the second air hole 2111 conducts LPG, the diameter of the first air hole 2112 is larger than that of the second air hole 2111, and vice versa. Furthermore, the first and second air holes 2112 and 2111 can be machined to the required diameters for motors of different power, enhancing versatility.

[0061] In some embodiments of the present application, the inner wall of the enclosure 111 has a cylindrical fixed section, and the fixed section and the connecting section are coaxially arranged. The inner core 220 is located in 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 arranged to communicate in the liquid control chamber 140.

[0062] It is understandable that, based on the matching relationship between the outer core 210 and the shell 110, the inner core 220 and the enclosure 111 also need to define the connection relationship between the two, so as to ensure that the inner core 220 is at least partially inserted into the enclosure 111 and is sealed and connected to the enclosure 111. Therefore, no matter what structure the enclosure 111 has, it is only necessary to ensure that the inner wall of the enclosure 111 has a cylindrical fixed section, and that 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. Similarly, an annular groove 226 is provided axially on the rotating section, 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 within the enclosure 111 and communicate with the bottom of the housing 110, the bottom of the inner core 220 is provided with a rotating plate 223. The upper end of the oil inlet hole 224 on the rotating plate 223 and the upper end of the oil outlet hole 2212 are arranged in communication within the liquid control chamber 140. When the inner core 220 rotates, the lower end of the oil outlet hole 2212 communicates with the orifice of the oil outlet pipe 113, and the lower end of the oil inlet hole 224 communicates with the inlet of the oil outlet pipe 113, thereby achieving communication between the oil outlet pipe 113 and the oil inlet pipe 112, thereby enabling fuel supply.

[0063] In some embodiments of the present application, the inner core 220 has an upper plate 222 and a lower plate that are spaced apart, and the upper plate 222 and the bottom plate are connected by a connecting portion 221, so that the inner core 220 and the surrounding plate 111 form a liquid inlet cavity 229 and a liquid outlet cavity 2210, and the liquid inlet cavity 229 and the liquid outlet cavity 2210 are connected through multiple connecting holes 225, the liquid inlet cavity 229 is connected to the oil inlet hole 224, and the liquid outlet cavity 2210 is connected to the oil outlet hole 2212.

[0064] It can be understood that the upper end of the oil inlet hole 224 and the upper end of the oil outlet hole 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, and the inner core 220 can rotate to realize fuel supply or shutdown.

[0065] In the existing structure, when the fuel passage is open, fuel enters the oil inlet hole 224 of the same diameter from the oil inlet pipe 112, then passes through the curved connecting cavity, and finally exits the oil outlet pipe 113 of the same diameter. Because the fuel enters the curved connecting cavity instantaneously from the oil inlet pipe 112, the curved structure of the connecting cavity easily causes the fluid to form vortices outside the bend (especially at high flow rates). These vortices can cause localized pressure fluctuations, increase fuel resistance, and easily lead to turbulent outlet flow. Consequently, the existing structure suffers from significant fuel pressure loss and fluctuations when the fuel passage is open.

[0066] To solve the above problems, the present application provides an inner core 220 structure, specifically, as Figure 1 、 4As shown in Figures 5, 8, and 9, the inner core 220 is an integrated structure, comprising an upper plate 222 and a lower plate of a circular plate-like structure arranged in a colinear manner. The upper plate 222 is arranged coaxially with the shell 110 and the enclosure 111. The circumferential side wall 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 periphery of the third sealing ring 228 is in sealing contact with the inner wall of the enclosure 111; a non-circular plug-in block 227 is provided on the upper part of the upper plate 222. The plug-in block 227 is plugged into the upper end of the inner cavity of the mounting portion 212 of the outer core 210, so that the outer core 210 and the inner core 220 can rotate simultaneously. The lower plate is a rotating plate 223, and the oil outlet hole 2212 and the oil inlet hole 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 hole 2212 and the center of the oil outlet pipe 113 are located on the circumference of the same circle, and the center of the circle is collinear with the axis of the enclosure 111 (lower plate). A connecting portion 221 is provided between the upper plate 222 and the lower plate. The connecting portion 221 is a plate-shaped or block-shaped structure. The connecting portion 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 arranged in the surrounding plate 111, the connecting portion 221 can make the inner core 220 and the surrounding plate 111 form a liquid inlet cavity 229 and a liquid outlet cavity 2210. The liquid inlet cavity 229 and the liquid outlet cavity 2210 are communicated through multiple connecting holes 225. The liquid inlet cavity 229 is communicated with the oil inlet hole 224, and the liquid outlet cavity 2210 is communicated with the oil outlet hole 2212.

[0067] When the inner core 220 of the present application conducts fuel, the fuel flows from the fuel inlet pipe 112 through the fuel inlet hole 224 and instantly enters a larger liquid inlet chamber 229. Then, it flows through the small-diameter connecting hole 225 into the larger liquid outlet chamber 2210. From the liquid outlet chamber 2210, it enters a smaller-diameter oil outlet hole 2212 before being supplied from the fuel outlet pipe 113. This is equivalent to the fuel being supplied as the fluid first flows from the smaller pipe into a larger space A (liquid inlet chamber 229), then flows through the smaller pipe (connecting hole 225) into another larger space B (liquid outlet chamber 2210), and finally is discharged through the smaller pipe. Then spaces A and B act as "buffer chambers" to absorb flow disturbances (such as bias flow and turbulence) of the fluid in the liquid inlet pipe; and after the fuel enters space A, the original turbulent energy is dissipated due to the sudden expansion of the diameter, and the flow tends to be stable; multiple connecting holes 225 act as "rectifiers", allowing only stable laminar flow or weak turbulence to pass through (the cross-sectional area of the small holes is fixed, and high-frequency fluctuations can be filtered out), and after secondary stabilization in space B, the outlet flow is more uniform; at the same time, the improved fluid path makes the flow state of the fuel closer to "free flow", the pressure field distribution is more uniform, and there is almost no risk of periodic pulsation; the inner core 220 structure of the present application can effectively suppress the turbulence and pressure fluctuations of the fuel when the fuel is conducted, achieve stable fuel supply, and reduce the loss of the engine group.

[0068] Moreover, due to the expanded diameter design of spaces A and B, the fuel is reduced. If there are impurities in the fuel, in this case, the impurities are more likely to settle due to gravity or inertia, reducing the risk of clogging the oil outlet pipe 113; even if a small amount of impurities pass through the connecting hole 225, the expansion of space B will reduce its impact on the outlet flow state, and the overall anti-clogging ability will be stronger.

[0069] In some embodiments of the present application, 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 of the valve core 200 and the valve housing 100 .

[0070] It is understood that the switch needs to control the rotation of the valve core 200 during the switching process. If the valve core 200 rotates within a certain range, multiple gear switching can be achieved. In order to limit the rotation angle of the valve core 200, a rotation limiter 500 can be provided. Since the inner core 220 and the 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 can limit the rotation angle of the entire valve core 200 and the valve housing 100.

[0071] For example, the rotation limiter 500 can be provided with a rotation baffle on the outer core 210 and two rotation baffles provided on the valve housing 100. The two rotation baffles are located on the rotation path of the rotation baffle. The rotation of the outer core 210 drives the rotation baffle to rotate, and the rotation baffle can only rotate in the area between the two rotation baffles. The layout of the two rotation baffles can limit the rotation angle of the outer core 210 and the valve housing 100, and correspondingly, the rotation angle of the inner core 220 and the valve housing 100 can be limited.

[0072] In some embodiments of the present application, the present application provides a rotation limiter 500 structure, which includes a limiter protrusion 510 and an arc-shaped limiter groove 520. The limiter protrusion 510 slides relative to the limiter groove 520 and contacts both ends of the limiter groove 520 to limit the rotation angle of the limiter protrusion 510 or the limiter groove 520. Figure 1 、 5 As shown in Figures 6 and 8, the present application sets a limiting protrusion 510 on the upper plate 222 of the inner core 220. The limiting protrusion 510 extends outward along the outer side of the upper plate 222. The limiting groove 520 is an arc-shaped groove set at the upper end of the surrounding plate 111. The limiting protrusion 510 is located in 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 and the valve housing 100 can be limited. In the present 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 the present application, the top of the outer core 210 extends out of the valve housing 100 and is connected to a rotating handle 600; an air circuit microswitch 320 and an oil circuit microswitch 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 air circuit microswitch 320 or the oil circuit microswitch 330.

[0074] It is understood that to achieve rotation of the valve core 200, at least part of the structure of the outer core 210 or the inner core 220 must be ensured to be outside the valve housing 100 to facilitate the driving of the valve core 200. In the present application, the inner core 220 is embedded in the bottom of the outer core 210. To achieve this, the top of the outer core 210 is extended out of the housing cover 120. To achieve the linkage control of the transfer switch and the carburetor, the air circuit microswitch 320 and the oil circuit microswitch 330 are installed 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 air circuit microswitch 320 or the oil circuit microswitch 330.

[0075] like Figure 1 、 4 As shown in Figures 5 and 6, an upwardly extending connecting column 218 is provided at the upper end of the mounting portion 212. The connecting column 218 passes through the mounting hole on the shell cover 120 and is located outside the valve shell 100. The rotating handle 600 is located above the connecting column 218 and is fixed to the connecting column 218. The air circuit microswitch 320 and the oil circuit microswitch 330 are fixed above the shell cover 120. The triggering ends of the air circuit microswitch 320 and the oil circuit microswitch 330 respectively cooperate with the triggering structure on the connecting column 218 to ensure that the outer core 210 and the rotating handle 600 rotate to trigger the air circuit microswitch 320 or the oil circuit microswitch 330.

[0076] In some embodiments of the present application, a trigger cam 310 is provided on the outer core 210 or the rotating handle 600. The trigger cam 310 has a protruding portion and a recessed portion. The trigger cam 310 rotates with the outer core 210 and the rotating handle 600 to cause the protruding portion to rotate, thereby triggering the gas circuit micro switch 320 or the oil circuit micro switch 330. Figure 1 、 2 As shown in , 4 , the trigger cam 310 is fixed to the connecting column 218. When the protrusion and the recess on the trigger cam 310 rotate with the outer core 210, they will cooperate with the springs of the air circuit micro switch 320 or the oil circuit micro switch 330 in turn to trigger the air circuit micro switch 320 or the oil circuit micro switch 330.

[0077] In some embodiments of the present application, an adjustment 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 in the valve housing 100 .

[0078] In order to limit the rotation angle of the valve core 200 and ensure the control of the oil circuit or gas circuit by the outer core 210 and the inner core 220, the present application provides an adjustment limiter 400 between the valve core 200 and the valve housing 100. Specifically, Figure 1 As shown, the adjustment limit member 400 is arranged between the shell cover 120 and the upper circular plate 211 of the outer core 210, and the adjustment limit member 400 includes at least one elastic limit steel ball 420 and a plurality of limit holes 410. The elastic limit steel ball 420 is located in the fixed limit column 421 at the bottom of the shell cover 120, and a spring (not shown in the figure) is provided in the limit column 421 to enable the elastic limit steel ball 420 to retract and contract at the end of the limit column 421. An annular groove 216 is provided on the top of the upper circular plate 211, and the plurality of limit holes 410 are all located in the groove 216 and are arranged in a ring along the axis of the upper circular plate 211, wherein the number and spacing angle of the plurality of limit 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 cooperating limiting holes 410 are provided. Any limiting hole 410 adjacent to the elastic limiting steel ball 420 will cooperate with the elastic limiting steel ball 420 when the outer core 210 rotates 45°.

[0079] Combine Figure 1-11 The structure of the multi-fuel switching switch is as follows: during installation, the inner core 220 is first embedded in the enclosure 111 and sealed with the inner wall of the enclosure 111, and then the outer core 210 is embedded in the shell 110. At the same time, the outer core 210 and the interior of the shell 110 are sealed and connected, and then the shell cover 120 is put on the outside of the connecting column 218 of the outer core 210 (rotate the limit piece 500 into place), connect the shell cover 120 and the upper end of the shell 110, put the trigger cam 310 on the connecting column 218, and then fix the micro switch. Finally, fix the rotating handle 600 and the connecting column 218 to complete the assembly of the entire switching switch.

[0080] Based on the switch structure in the diagram of this application, the operating principle of this application is as follows:

[0081] 1. When the handle 600 is placed on the upper Figure 12 When in the middle (1) position, the oil inlet hole 224 and the oil outlet hole 2212 of the inner core 220 are offset from the oil inlet pipe 112 and the oil outlet pipe 113 of the valve housing 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 housing 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 hole 224 and the oil outlet hole 2212 of the inner core 220 are aligned with the oil inlet pipe 112 and the oil outlet pipe 113 of the valve housing 100 respectively; the first air hole 2112 and the second air hole 2111 of the outer core 210 are staggered with the air outlet pipe 114 of the valve housing 100; at this time, the oil circuit is connected and the air circuit is disconnected, and the trigger cam 310 contacts the oil circuit micro switch 330 and disconnects from the air circuit micro switch 320.

[0083] 3. Turn the handle 600° and then 45° (a total of 90°) to Figure 12 When in the middle (3) position, the oil inlet hole 224 and the oil outlet hole 2212 of the inner core 220 are staggered with the oil inlet pipe 112 and the 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 staggered with the air outlet pipe 114 of the valve housing 100; at this time, NG is connected, the oil circuit and LPG are disconnected, the trigger cam 310 contacts the air circuit micro switch 320, and is disconnected from the oil circuit micro switch 330.

[0084] 4. Turn the handle 600° and then 45° (a total of 135°) to Figure 12 In the middle (4) position, the oil inlet hole 224 and the oil outlet hole 2212 of the inner core 220 are offset from the oil inlet pipe 112 and the 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 connected, the oil circuit and NG are disconnected, and the trigger cam 310 is still in contact with the air circuit micro switch 320, but is still disconnected from the oil circuit micro switch 330.

[0085] Due to the limiting effect of the inner core 220 and the valve housing 100, the handle can only be rotated 135 degrees counterclockwise to be in the closed position again. Figure 12 Middle (1) position.

[0086] Compared with the prior art, the multi-fuel switching switch of this application has the following advantages:

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

[0088] 2. The oil inlet and outlet holes 2212 and the air inlet and outlet holes of the multi-fuel switch of the present application are arranged in a more scientific direction, and the pipeline connections are not messy.

[0089] 3. The multi-fuel switch of the present application is highly versatile. Only the aperture of the valve core 200 (the first air hole 2112, the second air hole 2111, the oil inlet hole 224 and the oil outlet hole 2212) is changed. It can be suitable for generators of different powers. Moreover, according to the number of openings in the valve core 200 (only the first air hole 2112 or the first air hole 2112 and the second air hole 2111 at the same time), it can be used as a dual-fuel switch or a triple-fuel switch.

[0090] 4. The inner core 220 structure of the multi-fuel switch of the present application can make the fuel supply more stable and reduce the engine power loss.

[0091] 5. The multi-fuel switch of the present application is designed for the inlet and outlet passages of the gas, which can also make the gas supply more stable and reduce the power loss of the engine.

[0092] In the present invention, unless otherwise expressly specified or limited, the terms "mounted," "connected," "connect," "fixed," etc. should be understood broadly. For example, they may refer to fixed connection, detachable connection, or integration; mechanical connection or electrical connection; direct connection or indirect connection through an intermediate medium; internal communication between two components or interaction between two components. Those skilled in the art will understand the specific meanings of the above terms in the present invention based on specific circumstances.

[0093] In the description of the present invention, it should be noted that the terms "center," "upper," "lower," "left," "right," "inner," and "outer," etc., indicating orientations or positional relationships, are based on the orientations or positional relationships shown in the accompanying drawings, or are the orientations or positional relationships in which the inventive product is typically placed when in use. These terms are intended solely to facilitate and simplify the description of the present invention and are not intended to indicate or imply that the devices or components referred to must have a specific orientation, be constructed, or operate in a specific orientation. Therefore, they should not be construed as limitations on the present invention. Furthermore, the terms "first," "second," etc., etc., are used solely for distinction and should not be construed as indicating or implying relative importance.

[0094] It will be apparent to those skilled in the art that the present invention is not limited to the details of the exemplary embodiments described above and that the invention can be embodied in other specific forms without departing from the spirit or essential characteristics of the invention. Therefore, the embodiments should be considered in all respects as illustrative and non-restrictive, and the scope of the invention is defined by the appended claims, not the foregoing description, and all variations within the meaning and range of equivalents of the claims are intended to be included therein. Any reference sign in a claim should not be construed as limiting the claim to which it relates.

Claims

1. A multi-fuel switching switch, characterized by: It comprises a valve core (200) and a valve housing (100) which are rotatably connected. The valve housing (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 sealedly connected to the gas control chamber (130). The outer core (210) is provided with a connecting plate (213) that is in sealing contact and sliding connection with the gas inlet end of the gas outlet pipe (114). The connecting plate (213) is provided with a first gas hole (2112) and a second gas hole (2111). The outer core (210) rotates so that the first gas hole (2112) or the second gas hole (2111) communicates with the gas outlet pipe (114), so as to guide the gas in the gas inlet pipe (115) out of the gas outlet pipe (114). The inner core (220) is at least partially inserted into the liquid control chamber (140) and sealedly connected to the liquid control chamber (140). The inner core (220) is provided with a rotating plate (223) that is in sealed contact and sliding 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), so as to discharge the fuel in the oil inlet pipe (112) from the oil outlet pipe (113). The gas and the fuel oil circulate in the valve housing (100) alone, or the gas and the fuel oil do not circulate in the valve housing (100).

2. The multi-fuel switching switch according to claim 1, characterized in that: The valve housing (100) comprises a housing (110) and a housing cover (120) which are detachably connected. The upper end of the shell (110) is open, and an upwardly protruding annular enclosure plate (111) is provided at the bottom of the shell (110), so that the inner cavity of the shell (110) is divided into an internal liquid control cavity (140) and an external 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 switching switch according to claim 2, characterized in that: The inner wall of the shell (110) has a cylindrical connecting section, the upper part of the outer core (210) has a mounting section that cooperates with the connecting section, and the mounting section is sealed and rotatably connected to the connecting section. 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 concave groove, and the surrounding plate (111) is located in the groove. The bottom of the outer core (210) is a connecting plate (213), and the first air hole (2112) and the second air hole (2111) of the connecting plate (213) are both communicated with the chamber (2113).

4. The multi-fuel switching 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 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 arranged in communication within the liquid control chamber (140).

5. The multi-fuel switch according to claim 4, characterized in that: The inner core (220) comprises an upper plate (222) and a lower plate which are spaced apart from each other. The upper plate (222) and the bottom plate are connected via a connecting portion (221), so that the inner core (220) and the surrounding plate (111) form a liquid inlet cavity (229) and a liquid outlet cavity (2210). The liquid inlet cavity (229) and the liquid outlet cavity (2210) are in communication with each other via a plurality of connecting holes (225). The liquid inlet cavity (229) is in communication with the oil inlet hole (224), and the liquid outlet cavity (2210) is in communication with the oil outlet hole (2212).

6. The multi-fuel switch according to claim 1, 2, 3, 4 or 5, characterized in that: 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 of the valve core (200) and the valve housing (100).

7. The multi-fuel switch according to claim 6, characterized in that: The rotation limiting member (500) comprises 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).

8. The multi-fuel switch according to claim 1, 2, 3, 4, 5 or 7, characterized in that: The top of the outer core (210) extends out of the valve housing (100) and is connected to a rotating handle (600); An air circuit microswitch (320) and an oil circuit microswitch (330) are provided between the rotating handle (600) or the outer core (210) and the valve housing (100). The outer core (210) and the rotating handle (600) rotate to trigger the air circuit microswitch (320) or the oil circuit microswitch (330).

9. The multi-fuel switch according to claim 8, characterized in that: A trigger cam (310) is provided on the outer core (210) or the rotating handle (600). The trigger cam (310) has a protruding portion and a recessed portion. The trigger cam (310) rotates with the outer core (210) and the rotating handle (600) to cause the protruding portion to rotate, thereby triggering the gas circuit micro switch (320) or the oil circuit micro switch (330).

10. The multi-fuel switch according to claim 1, 2, 3, 5, 7 or 9, characterized in that: An adjustment 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) in the valve housing (100).

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