An internal combustion engine fuel switching device

Abstract

The present invention provides an internal combustion engine fuel switching device, which includes a housing body, a gas valve core, a flow switching valve core and a fuel switch assembly. The fuel switching device has a compact structure and occupies a small space, can quickly realize the switching between liquefied petroleum gas and natural gas, and can simultaneously ensure the opening and closing of the fuel passage, is safe and reliable, has good versatility, and can effectively improve the power performance and economic performance of the internal combustion engine.

Description

Technical Field

[0001] The present invention relates to the technical field of fuel switching devices, and particularly to a fuel switching device for an internal combustion engine. Background Art

[0002] Existing internal combustion engines usually use multiple fuels, generally including liquid fuels and gaseous fuels. The liquid fuel is generally gasoline or alcohol gasoline, and the gaseous fuels are generally liquefied petroleum gas and natural gas. The liquid fuel is generally in a separate liquid fuel passage, and the two gaseous fuels share another gaseous fuel passage. When using the liquid fuel, the gaseous fuel passage needs to be closed, and when using the gaseous fuel (only one of liquefied petroleum gas or natural gas), the liquid fuel passage needs to be closed (in the prior art, the closing of the liquid fuel passage is generally switched by an electronic system in the carburetor).

[0003] The switching between the liquid fuel and the gaseous fuel is generally achieved by a fuel switching device, which realizes the switching between the liquid fuel and the gaseous fuel by switching the opening and closing of the liquid fuel passage or the gaseous fuel passage.

[0004] When using the gaseous fuel, due to the different air-fuel ratios of liquefied petroleum gas and natural gas, the required flow rates of liquefied petroleum gas or natural gas are also different. The current technical solutions usually require two switching mechanisms (or two operations) to achieve the switching between the liquid fuel and the gaseous fuel, and the switching of the flow rates of liquefied petroleum gas and natural gas. In this way, not only does it increase the complexity of the structure of the switching device, the volume is large, occupying a relatively large space position, but also the operation is cumbersome, time-consuming and laborious. Summary of the Invention

[0005] Aiming at the defects in the prior art, the purpose of the present invention is to provide a fuel switching device for an internal combustion engine, so as to facilitate the rapid switching between liquefied petroleum gas and natural gas, and enable the internal combustion engine to maintain the best working state when using different fuels.

[0006] To achieve the above object, the present invention provides a fuel switching device for an internal combustion engine, including a housing body, which is provided with a first inner cavity, a second inner cavity, an intake passage, an exhaust passage, an oil inlet passage and an oil outlet passage; a gas valve core, which is arranged in the first inner cavity and is sealingly matched with the inner wall of the first inner cavity, the gas valve core is configured to rotate controllably, and the gas valve core has a first working position, a second working position, a third working position and a fourth working position; a flow rate switching valve core, which is arranged on the gas valve core, and the flow rate switching valve core is penetrated by a ventilation hole; and a fuel switch assembly, which is arranged in the second inner cavity, and the fuel switch assembly is configured to act synchronously with the gas valve core to realize the connection or blockage of the oil inlet passage and the oil outlet passage;

[0007] When the gas valve core rotates to the first working position, the intake passage communicates with the outlet passage through the ventilation hole, the gas flow rate through the outlet passage is the smallest, and the fuel switch assembly blocks the communication between the fuel inlet passage and the fuel outlet passage;

[0008] When the gas valve core rotates to the second working position, the gas valve core blocks the communication between the intake passage and the outlet passage, and the fuel inlet passage communicates with the fuel outlet passage;

[0009] When the gas valve core rotates to the third working position, the intake passage communicates with the outlet passage, the gas flow rate through the outlet passage is the largest, and the fuel switch assembly blocks the communication between the fuel inlet passage and the fuel outlet passage;

[0010] When the gas valve core rotates to the fourth working position, the gas valve core blocks the communication between the intake passage and the outlet passage, and the fuel switch assembly blocks the communication between the fuel inlet passage and the fuel outlet passage.

[0011] Preferably, a hemispherical chamber is provided at one end of the first inner cavity close to the outlet passage. The gas valve core has a disc structure, and the rotation axis of the gas valve core is perpendicular to the central axis of the gas valve core and passes through the center of the hemispherical chamber;

[0012] The radius of the circumference where the outer contour of the flow rate switching valve core is located is less than or equal to the outer diameter of the gas valve core, and the rotation axis of the flow rate switching valve core coincides with the rotation axis of the gas valve core.

[0013] Preferably, the central axis of the ventilation hole coincides with the central axis of the outlet passage.

[0014] Preferably, an oil inlet and an oil outlet are provided in the second inner cavity. The oil inlet communicates with the fuel inlet passage, and the oil outlet communicates with the fuel outlet passage; the fuel switch assembly includes a seal and a fuel valve core. The seal is provided with a first through hole and a second through hole. The first through hole is in sealing fit with the oil inlet, and the second through hole is in sealing fit with the oil outlet;

[0015] The fuel valve core is sealingly rotatably arranged in the second inner cavity and is in sealing fit with the seal. A connection passage for communicating or blocking the feed port and the oil outlet is provided on the end face of the fuel valve core facing the seal.

[0016] Preferably, a plurality of anti-rotation protrusions are provided on the end wall of the second inner cavity near the seal, and a plurality of first limiting portions are provided on the seal and are matched with the anti-rotation protrusions.

[0017] Preferably, a first mounting hole and a second mounting hole communicating with the hemispherical chamber are provided on the outer shell body, and the second mounting hole communicates with the hemispherical chamber and the second inner cavity respectively; a first rotating shaft is hermetically and rotatably arranged in the first mounting hole, one end of the first rotating shaft is connected to the gas valve core, a second rotating shaft is hermetically and rotatably arranged in the second mounting hole, and both ends of the second rotating shaft are connected to the gas valve core and the fuel valve core respectively.

[0018] Preferably, the first rotating shaft is provided with a first connecting portion connected to the gas valve core, and the second rotating shaft is provided with a second connecting portion connected to the gas valve core.

[0019] Preferably, a second limiting portion is provided on the first rotating shaft, a base is provided on the outer shell body, the second limiting portion passes through the base, and an elastic anti-rotation portion cooperating with the second limiting portion is provided on the base.

[0020] Advantages of the present invention:

[0021] The present invention discloses an internal combustion engine fuel switching device, which can adjust the working position of the gas valve core by rotating the gas valve core, so as to realize that the fuel switching device switches to different working states. While the gas valve core rotates, the fuel switch assembly can also act following the gas valve core to realize the connection or blockage of the fuel inlet channel and the fuel outlet channel, thus further ensuring the response speed and safety reliability of the opening and closing of the fuel channel. In this way, the internal combustion engine can maintain the best working state when using different fuels.

[0022] Moreover, by designing a flow switching valve core with a ventilation hole on the gas valve core, the fuel switching device has two gas working states of the maximum gas flow rate and the minimum gas flow rate, so as to correspond to the different flow rate requirements when introducing liquefied petroleum gas or natural gas, and enable the internal combustion engine to achieve two best working states when using liquefied petroleum gas or natural gas.

[0023] The fuel switching device has a compact structure, occupies a small space, can quickly realize the switching between liquefied petroleum gas and natural gas, and can simultaneously ensure the opening and closing of the fuel channel, is safe and reliable, has good versatility, and can effectively improve the power performance and economic performance of the internal combustion engine. Description of the Drawings

[0024] In order to more clearly illustrate the specific embodiments of the present invention or the technical solutions in the prior art, the following will briefly introduce the drawings required for use in the description of the specific embodiments or the prior art. In all the drawings, similar elements or parts are generally identified by similar reference numerals. In the drawings, the elements or parts do not necessarily draw according to the actual scale.

[0025] Figure 1 Schematic structural diagram of an internal combustion engine fuel switching device provided by an embodiment of the present invention;

[0026] Figure 2 Schematic structural diagram of a gas valve core;

[0027] Figure 3 Schematic structural diagram of the other side of the gas valve core;

[0028] Figure 4 Schematic diagram when the gas valve core is in the first working position;

[0029] Figure 5 Schematic diagram when the gas valve core is in the second working position;

[0030] Figure 6 Schematic diagram when the gas valve core is in the third working position;

[0031] Figure 7 Schematic diagram when the gas valve core is in the fourth working position;

[0032] Figure 8 Schematic structural diagram of a second housing;

[0033] Figure 9 Partial sectional schematic diagram of the second housing;

[0034] Figure 10 Schematic structural diagram of a fuel valve core;

[0035] Figure 11 Schematic structural diagram of a seal;

[0036] Figure 12 Schematic structural diagram when the connection channel is communicated with the oil inlet when the gas valve core is in the first working position;

[0037] Figure 13 Schematic structural diagram when the connection channel is simultaneously communicated with the oil inlet and the oil outlet when the gas valve core is in the second working position;

[0038] Figure 14 Schematic structural diagram when the connection channel is communicated with the oil outlet when the gas valve core is in the third working position;

[0039] Figure 15 Schematic structural diagram when the connection channel blocks the oil inlet and the oil outlet simultaneously when the gas valve core is in the fourth working position;

[0040] Figure 16 Schematic structural diagram of the first rotating shaft and the second rotating shaft respectively cooperating with the gas valve core;

[0041] Figure 17 Schematic structural diagram of an elastic anti-rotation part.

[0042] Reference numerals:

[0043] 10 - housing body, 11 - first housing, 12 - second housing, 121 - receiving groove, 122 - oil inlet, 123 - oil outlet, 124 - first protrusion, 125 - second protrusion, 126 - anti - rotation protrusion, 13 - first inner cavity, 131 - hemispherical chamber, 14 - intake passage, 15 - exhaust passage, 16 - oil inlet passage, 17 - oil outlet passage;

[0044] 20 - gas valve core, 21 - first installation groove, 22 - connecting protrusion;

[0045] 30 - flow - switching valve core, 31 - vent hole;

[0046] 40 - seal, 41 - first through - hole, 42 - second through - hole, 43 - third through - hole;

[0047] 50 - fuel valve core, 51 - connecting passage;

[0048] 61 - first rotating shaft, 62 - second rotating shaft, 63 - first connecting portion, 64 - second connecting portion, 65 - second limiting portion, 651 - limiting groove;

[0049] 70 - base, 71 - fourth through - hole, 72 - fifth through - hole;

[0050] 81 - steel ball, 82 - compression spring, 83 - screw. Detailed implementation manners

[0051] Hereinafter, embodiments of the technical solutions of the present invention will be described in detail with reference to the drawings. The following embodiments are only used to more clearly illustrate the technical solutions of the present invention, so they are only examples and cannot be used to limit the protection scope of the present invention.

[0052] It should be noted that, unless otherwise specified, the technical terms or scientific terms used in this application should have the ordinary meanings understood by those skilled in the art to which the present invention belongs.

[0053] In the description of this application, it should be understood that the orientation or positional relationship indicated by the terms "center", "longitudinal", "transverse", "length", "width", "thickness", "upper", "lower", "front", "rear", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer", "clockwise", "counterclockwise", "axial", "radial", "circumferential", etc. is based on the orientation or positional relationship shown in the drawings, and is only for the convenience of describing the present invention and simplifying the description, rather than indicating or implying that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and therefore cannot be understood as a limitation of the present invention.

[0054] Furthermore, terms such as "first" and "second" are for descriptive purposes only and should not be construed as indicating or implying relative importance or implicitly specifying the quantity of the indicated technical features. In the description of the present invention, "a plurality of" means more than two unless otherwise specifically defined.

[0055] In this application, unless otherwise clearly specified and defined, terms such as "mounted", "connected", "coupled", "fixed", etc. should be understood in a broad sense. For example, it can be a fixed connection, a detachable connection, or integrated; it can be a mechanical connection or an electrical connection; it can be directly connected or indirectly connected through an intermediate medium, and it can be the communication inside two components or the interaction relationship between two components. For those of ordinary skill in the art, the specific meanings of the above terms in the present invention can be understood according to specific circumstances.

[0056] In this application, unless otherwise clearly specified and defined, the first feature being "on" or "under" the second feature can be that the first and second features are in direct contact, or the first and second features are indirectly in contact through an intermediate medium. Moreover, the first feature being "above", "over" and "on top of" the second feature can be that the first feature is directly above or obliquely above the second feature, or simply means that the first feature has a higher horizontal height than the second feature. The first feature being "under", "beneath" and "underneath" the second feature can be that the first feature is directly below or obliquely below the second feature, or simply means that the first feature has a lower horizontal height than the second feature.

[0057] As Figure 1-17 shown, in an embodiment of the present invention, there is provided an internal combustion engine fuel switching device, which includes a housing body 10, a gas valve core 20, a flow switching valve core 30 and a fuel switch assembly.

[0058] The housing body 10 includes a first housing 11 and a second housing 12 arranged in an upper and lower structure. A first inner cavity 13, an intake passage 14 and an exhaust passage 15 are all provided on the first housing 11, and an oil inlet passage 16 and an oil outlet passage 17 are provided on the second housing 12. A receiving groove 121 is recessed on the second housing 12. When the second housing 12 is connected to the first housing 11, the receiving groove 121 and the first housing 11 enclose to form a second inner cavity.

[0059] The gas valve core 20 is installed in the first inner cavity 13 and is in sealing cooperation with the inner wall of the first inner cavity 13. The gas valve core 20 is configured to rotate controllably, and the gas valve core 20 has a first working position, a second working position, a third working position and a fourth working position. The flow switching valve core 30 is installed on the gas valve core 20, and a ventilation hole 31 through which gas can pass is penetrated through the flow switching valve core 30. The fuel switch assembly is installed in the second inner cavity, and the fuel switch assembly is configured to act synchronously with the gas valve core 20 to realize the connection or blockage of the oil inlet passage 16 and the oil outlet passage 17.

[0060] Refer to Figure 4 , when the gas valve core 20 rotates to the first working position, the gas valve core 20 is in an open state, and the fuel switch assembly blocks the communication between the fuel inlet passage 16 and the fuel outlet passage 17, and the fuel passage is closed, so as to provide a double insurance for closing the fuel passage. At this time, the flow switching valve core 30 blocks the communication between the air inlet passage 14 and the air outlet passage 15. Since the air vent hole 31 penetrates through the flow switching valve core 30, the air inlet passage 14 and the air outlet passage 15 are communicated through the air vent hole 31, but the gas flow rate through the air outlet passage 15 is the smallest. Therefore, this fuel switching device will achieve the first gas working state (the smallest gas flow rate), and liquefied petroleum gas will be introduced into the air inlet passage 14 for operation.

[0061] Refer to Figure 5 , when the gas valve core 20 rotates to the second working position (rotated 90° from the first working position), the gas valve core 20 is in a closed state, and the gas valve core 20 blocks the communication between the air inlet passage 14 and the air outlet passage 15, and the gas passage is closed. The fuel switch assembly will connect the fuel inlet passage 16 and the fuel outlet passage 17. At this time, this fuel switching device will achieve the fuel working state.

[0062] Refer to Figure 6 , when the gas valve core 20 rotates to the third working position (rotated 90° from the second working position), the gas valve core 20 is in an open state, and the fuel switch assembly blocks the communication between the fuel inlet passage 16 and the fuel outlet passage 17, and the fuel passage is closed. However, different from the first working position, the flow switching valve core 30 will not intervene in the operation, the air inlet passage 14 and the air outlet passage 15 are communicated, and the gas flow rate through the air outlet passage 15 is the largest. Therefore, this fuel switching device will achieve the second gas working state (the largest gas flow rate), and natural gas will be introduced into the air inlet passage 14 for operation.

[0063] Refer to Figure 7 , when the gas valve core 20 rotates to the fourth working position (rotated 90° from the third working position), the gas valve core 20 blocks the communication between the air inlet passage 14 and the air outlet passage 15, and the fuel switch assembly blocks the communication between the fuel inlet passage 16 and the fuel outlet passage 17. At this time, the gas passage is closed and the fuel passage is closed. Therefore, this fuel switching device will achieve the all-fuel closed working state.

[0064] Therefore, this fuel switching device has four working states, namely the first gas working state, the fuel working state, the second gas working state, and the all-fuel closed working state.

[0065] By rotating the gas valve core 20, the working position of the gas valve core 20 can be adjusted, so as to enable the fuel switching device to switch to different working states. While the gas valve core 20 rotates, the fuel switch assembly can also act following the gas valve core to realize the connection or blockage of the fuel inlet passage 16 and the fuel outlet passage 17, thus further ensuring the response speed and safety reliability of the opening and closing of the fuel passage. In this way, the internal combustion engine can maintain the best working state when using different fuels.

[0066] Moreover, by designing a flow switching valve core 30 with a vent hole 31 on the gas valve core 20, the fuel switching device has two gas working states of maximum gas flow rate and minimum gas flow rate, corresponding to different flow rate requirements when liquefied petroleum gas or natural gas is introduced, so that the internal combustion engine can achieve two best working states when using liquefied petroleum gas or natural gas.

[0067] The fuel switching device has a compact structure, occupies a small space, can quickly realize the switching between liquefied petroleum gas and natural gas, and can simultaneously ensure the opening and closing of the fuel passage, is safe and reliable, has good versatility, and can effectively improve the power performance and economic performance of the internal combustion engine.

[0068] In one embodiment, a hemispherical chamber 131 is provided at one end of the first inner cavity 13 close to the gas outlet passage 15. The gas valve core 20 has a disc structure. The rotation axis of the gas valve core 20 is perpendicular to the central axis of the gas valve core 20 and passes through the center of the hemispherical chamber 131. The radius of the circumference where the outer contour of the flow switching valve core 30 is located is less than or equal to the outer diameter of the gas valve core 20.

[0069] A first installation groove 21 is recessed on the circumferential side wall of the gas valve core 20, and a first sealing ring that is hermetically fitted with the hemispherical chamber 131 is embedded in the first installation groove 21. When the gas valve core 20 rotates to adjust its working position, the first sealing ring will always tightly seal the gap between the gas valve core 20 and the hemispherical chamber 131. When the gas valve core 20 rotates to the second working position or the fourth working position, the gas valve core 20 will completely block the hemispherical chamber 131. In this way, the gas valve core 20 will block the connection between the air inlet passage 14 and the air outlet passage 15, and the air inlet passage 14 and the air outlet passage 15 will be in a disconnected state, and gas cannot enter the air outlet passage 15.

[0070] When the gas valve core 20 rotates to the first working position, the flow switching valve core 30 will still block the connection between the air inlet passage 14 and the air outlet passage 15. Since the vent hole 31 penetrates through the flow switching valve core 30, the air inlet passage 14 and the air outlet passage 15 are connected through the vent hole 31, but the gas flow rate through the air outlet passage 15 is the smallest. Therefore, the fuel switching device will realize the first gas working state (minimum gas flow rate).

[0071] When the gas valve core 20 rotates to the third working position, the flow switching valve core 30 will not interfere with the communication between the intake passage 14 and the outlet passage 15, and the gas flow rate through the outlet passage 15 is the largest. Therefore, this fuel switching device will achieve the second gas working state (the largest gas flow rate). By designing the flow switching valve core 30 on the gas valve core 20, this fuel switching device has two gas working states of the largest gas flow rate and the smallest gas flow rate, so as to correspond to the different flow rate requirements when liquefied petroleum gas or natural gas is introduced, enabling the internal combustion engine to achieve two optimal working states when using liquefied petroleum gas or natural gas.

[0072] In one embodiment, the central axis of the vent hole 31 coincides with the central axis of the outlet passage 15. This design enables the liquefied petroleum gas to quickly flow into the outlet passage 15 after passing through the vent hole 31, thereby increasing the flow rate of the liquefied petroleum gas in the first gas working state.

[0073] In one embodiment, an oil inlet 122 and an oil outlet 123 are provided in the second inner cavity. The oil inlet 122 is communicated with the oil inlet passage 16, and the oil outlet 123 is communicated with the oil outlet passage 17. The fuel switch assembly includes a seal 40 and a fuel valve core 50. The seal 40 is provided with a first through hole 41 and a second through hole 42. The first through hole 41 is in sealing cooperation with the oil inlet 122, and the second through hole 42 is in sealing cooperation with the oil outlet 123. The fuel valve core 50 is rotatably and sealingly arranged in the second inner cavity and is in sealing cooperation with the seal 40. A connection passage 51 for communicating or blocking the feed port and the oil outlet 123 is provided on the end face of the fuel valve core 50 facing the seal 40. A plurality of anti-rotation protrusions 126 are provided on the end wall of the second inner cavity near the seal 40, and a plurality of first limiting portions cooperating with the anti-rotation protrusions 126 are provided on the seal 40.

[0074] Both the fuel valve core 50 and the seal 40 are in a disc structure. A second installation groove is provided on the outer wall of the fuel valve core 50, and a second sealing ring is embedded in the second installation groove. The seal 40 is made of a rubber gasket, and the connection passage 51 is a groove that extends along the circumferential direction of the fuel valve core 50. The first limiting portion includes two third through holes 43. The first through hole 41, the second through hole 42, and the two third through holes 43 all penetrate the seal 40 along the axial direction of the seal 40, and the first through hole 41, the second through hole 42, and the two third through holes 43 are arranged in an annular array along the central axis of the seal 40.

[0075] Correspondingly, a first protrusion 124, a second protrusion 125, and two anti-rotation protrusions 126 are arranged in an annular array on the end wall of the receiving groove 121 near the seal 40. The oil inlet 122 penetrates through the first protrusion 124 and is communicated with the oil inlet passage 16, and the oil outlet 123 penetrates through the second protrusion 125 and is communicated with the oil outlet passage 17.

[0076] Refer toFigure 12 When the gas valve core 20 rotates to the first working position, the connecting channel 51 is only communicated with the oil inlet 122, and the fuel valve core 50 cooperates with the seal 40 to block the oil outlet 123, and the fuel channel is closed. The fuel switching device will achieve the first gas working state, and the intake channel 14 will introduce liquefied petroleum gas for operation.

[0077] Refer to Figure 13 When the gas valve core 20 rotates to the second working position, the fuel valve core 50 will rotate synchronously. At this time, the gas channel is closed, the connecting channel 51 is communicated with both the oil inlet 122 and the oil outlet 123 at the same time, and the fuel valve core 50 will block the oil outlet 123. The fuel sequentially passes through the oil inlet channel 16, the oil inlet 122, the connecting channel 51 and the oil outlet 123 and enters the oil outlet channel 17. The fuel switching device will achieve the fuel working state.

[0078] Refer to Figure 14 When the gas valve core 20 rotates to the third working position, the fuel valve core 50 rotates synchronously, the connecting channel 51 is only communicated with the oil outlet 123, the fuel valve core 50 cooperates with the seal 40 to block the oil inlet 122, and the fuel channel is closed. The fuel switching device will achieve the second gas working state, and the intake channel 14 will introduce natural gas for operation.

[0079] Refer to Figure 15 When the gas valve core 20 rotates to the fourth working position, the gas channel is closed, the fuel valve core 50 rotates synchronously, the connecting channel 51 is neither communicated with the oil outlet 123 nor with the oil inlet 122, and the fuel valve core 50 cooperates with the seal 40 to block the oil inlet 122 and the oil outlet 123, and the fuel channel is closed. The fuel switching device will achieve the all-fuel-off working state.

[0080] The fuel switch assembly can follow the adjustment of the working position of the gas valve core 20 to realize the connection or blockage of the oil inlet channel 16 and the oil outlet channel 17. It has a compact structure, ingenious design and good synchronism.

[0081] In one embodiment, the housing body 10 is provided with a first mounting hole and a second mounting hole communicated with the hemispherical chamber 131. The second mounting hole is respectively communicated with the hemispherical chamber 131 and the second inner cavity. A first rotating shaft 61 is sealingly and rotatably arranged in the first mounting hole. The first rotating shaft 61 is provided with a first connecting portion 63 connected to the gas valve core 20. A second rotating shaft 62 is sealingly and rotatably arranged in the second mounting hole. One end of the second rotating shaft 62 is provided with a second connecting portion 64 connected to the gas valve core 20, and the other end of the second rotating shaft 62 is coaxially and fixedly connected to the fuel valve core 50.

[0082] The first rotating shaft 61 is provided with a third installation groove, and a third sealing ring is embedded in the third installation groove. The second rotating shaft 62 is provided with a fourth installation groove, and a fourth sealing ring is embedded in the fourth installation groove. On the side of the gas valve core 20 facing away from the flow rate switching valve core 30, two connecting protrusions 22 are provided, and each connecting protrusion 22 is close to the outer edge of the gas valve core 20. The first connecting portion 63 includes a first clamping groove that can be clamped into the gas valve core 20, the flow rate switching valve core 30, and the connecting protrusion 22. The second connecting portion 64 includes a second clamping groove that can be clamped into the gas valve core 20, the flow rate switching valve core 30, and the other connecting protrusion 22. Thus, when an external force drives the first rotating shaft 61 to rotate, the first rotating shaft 61 will drive the gas valve core 20, the flow rate switching valve core 30, the second rotating shaft 62, and the fuel valve core 50 to rotate synchronously.

[0083] In one embodiment, a second limiting portion 65 is provided on the first rotating shaft 61, a base 70 is provided on the housing body 10, the second limiting portion 65 passes through the base 70, and an elastic anti-rotation portion is provided on the base 70 and is matched with the second limiting portion 65.

[0084] Specifically, the base 70 is installed on the side of the first housing 11 facing away from the second housing 12. A fourth through hole 71 for the second limiting portion 65 to pass through is penetrated through the base 70. The second limiting portion 65 has a rod-shaped structure. Four limiting grooves 651 are recessed on the outer wall of the second limiting portion 65. The four limiting grooves 651 extend along the axial direction of the second limiting portion 65, and the four limiting grooves 651 are arranged in a circular array along the central axis of the second limiting portion 65. Each limiting groove 651 corresponds to the first working position, the second working position, the third working position, and the fourth working position of the gas valve core 20 respectively.

[0085] The elastic anti-rotation portion includes two groups of anti-rotation units. Two fifth through holes 72 are respectively provided on the inner wall of the fourth through hole 71. Each group of anti-rotation units is respectively installed in the corresponding fifth through hole 72. The anti-rotation unit includes a steel ball 81, a compression spring 82, and a screw 83. The screw 83 abuts against the compression spring 82 to make the compression spring 82 in a compressed state. The compression spring 82 abuts against the steel ball 81, and the steel ball 81 abuts against the limiting groove 651 of the second limiting portion 65.

[0086] When the second limiting part 65 is rotated, the steel ball is pressed by the compression spring 82 and will fall into the limiting groove 651. At this time, the second limiting part 65 is limited by the steel ball 81 and will not rotate easily. When the second limiting part 65 is rotated again, the steel ball rolls out of the limiting groove 651. This process will compress the compression spring 82, increasing the pressure on the steel ball 81, so that a larger torque is required to rotate the second limiting part 65. When the steel ball completely rolls out of the limiting groove 651 and the second limiting part 65 is continuously rotated, there is no compression change in the compression spring 82 during this process, and all the pressure applied to the steel ball 81 is applied to the second limiting part 65. Therefore, only a smaller torque is required to rotate the second limiting part 65. When the second limiting part 65 is continuously rotated, the steel ball 81 enters the adjacent limiting groove 651, and the compression spring 82 begins to release, reducing the pressure on the steel ball 81. Only a very small torque (or even no torque) is required to rotate the second limiting part 65 continuously to make the steel ball 81 roll into the limiting groove 651 of the second limiting part 65.

[0087] The elastic anti-rotation part and the second limiting part 65 cooperate to ensure that when the second limiting part 65 is rotated, the gas valve core 20, the flow switching valve core 30 and the fuel valve core 50 can accurately reach the specified positions and ensure that there is no displacement during operation, thereby improving the reliability of the fuel switching device.

[0088] In the description of the present invention, a large number of specific details are set forth. However, it is understood that the embodiments of the present invention may be practiced without these specific details. In some instances, well-known methods, structures and technologies have not been shown in detail so as not to obscure the understanding of this specification.

[0089] Finally, it should be noted that the above embodiments are only used to illustrate the technical solutions of the present invention and are not intended to limit them. Although the present invention has been described in detail with reference to the foregoing embodiments, those of ordinary skill in the art should understand that they can still modify the technical solutions described in the foregoing embodiments, or perform equivalent replacements for some or all of the technical features; and these modifications or replacements do not cause the essence of the corresponding technical solutions to deviate from the scope of the technical solutions of the embodiments of the present invention, and they should all be covered by the scope of the claims and the description of the present invention.

Claims

1. An internal combustion engine fuel switching device, characterized in that: It includes: A housing body, which is provided with a first inner cavity, a second inner cavity, an intake passage, an exhaust passage, an oil inlet passage and an oil outlet passage; A gas valve core, which is arranged in the first inner cavity and is in sealed cooperation with the inner wall of the first inner cavity. The gas valve core is configured to rotate controllably, and the gas valve core has a first working position, a second working position, a third working position and a fourth working position; A flow switching valve core, which is arranged on the gas valve core, and the flow switching valve core is penetrated with a ventilation hole; and A fuel switch assembly, which is arranged in the second inner cavity, and the fuel switch assembly is configured to act synchronously with the gas valve core to realize the connection or blockage of the oil inlet passage and the oil outlet passage; When the gas valve core rotates to the first working position, the intake passage is communicated with the exhaust passage through the ventilation hole, the gas flow through the exhaust passage is the smallest, and the fuel switch assembly blocks the connection between the oil inlet passage and the oil outlet passage; When the gas valve core rotates to the second working position, the gas valve core blocks the connection between the intake passage and the exhaust passage, and the oil inlet passage is communicated with the oil outlet passage; When the gas valve core rotates to the third working position, the intake passage is communicated with the exhaust passage, the gas flow through the exhaust passage is the largest, and the fuel switch assembly blocks the connection between the oil inlet passage and the oil outlet passage; When the gas valve core rotates to the fourth working position, the gas valve core blocks the connection between the intake passage and the exhaust passage, and the fuel switch assembly blocks the connection between the oil inlet passage and the oil outlet passage.

2. The internal combustion engine fuel switching device according to claim 1, characterized in that: A hemispherical chamber is arranged at one end of the first inner cavity close to the exhaust passage. The gas valve core has a disc structure, and the rotation axis of the gas valve core is perpendicular to the central axis of the gas valve core and passes through the center of the hemispherical chamber; The radius of the circumference where the outer contour of the flow switching valve core is located is less than or equal to the outer diameter of the gas valve core, and the rotation axis of the flow switching valve core coincides with the rotation axis of the gas valve core.

3. The internal combustion engine fuel switching device according to claim 2, characterized in that: The central axis of the ventilation hole coincides with the central axis of the exhaust passage.

4. The internal combustion engine fuel switching device according to claim 2, characterized in that: An oil inlet and an oil outlet are arranged in the second inner cavity. The oil inlet is communicated with the oil inlet passage, and the oil outlet is communicated with the oil outlet passage; The fuel switch assembly includes a seal and a fuel valve core. The seal is penetrated with a first through hole and a second through hole. The first through hole is in sealed cooperation with the oil inlet, and the second through hole is in sealed cooperation with the oil outlet; The fuel valve core is sealed and rotatably arranged in the second inner cavity and is in sealed cooperation with the seal. A connection passage for realizing the connection or disconnection between the feed port and the oil outlet is arranged on the end face of the fuel valve core facing the seal.

5. The internal combustion engine fuel switching device according to claim 4, characterized in that: A plurality of anti-rotation protrusions are provided on the end wall of the second inner cavity near the seal, and a plurality of first limiting portions are provided on the seal and are matched with the anti-rotation protrusions.

6. The internal combustion engine fuel switching device according to claim 4, characterized in that: A first mounting hole and a second mounting hole communicating with the hemispherical chamber are provided on the housing body, and the second mounting hole communicates with the hemispherical chamber and the second inner cavity respectively; A first rotating shaft is hermetically and rotatably arranged in the first mounting hole, one end of the first rotating shaft is connected to the gas valve core, a second rotating shaft is hermetically and rotatably arranged in the second mounting hole, and both ends of the second rotating shaft are connected to the gas valve core and the fuel valve core respectively.

7. The internal combustion engine fuel switching device according to claim 6, characterized in that: The first rotating shaft is provided with a first connecting portion connected to the gas valve core, and the second rotating shaft is provided with a second connecting portion connected to the gas valve core.

8. The internal combustion engine fuel switching device according to claim 6, characterized in that: A second limiting portion is provided on the first rotating shaft, a base is provided on the housing body, the second limiting portion passes through the base, and an elastic anti-rotation portion matched with the second limiting portion is provided on the base.

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