Oil-gas conversion switch

Abstract

The present invention relates to the field of engine technology, and in particular to an oil-gas conversion switch, comprising a housing, a valve core, a first sealing sleeve and a second sealing sleeve; the valve core is installed in the housing, the first sealing sleeve and the second sealing sleeve are both sleeved on the outside of the valve core, and the second sealing sleeve is located at the bottom of the first sealing sleeve; the cross section of the first sealing sleeve is wedge-shaped. In this method, the first sealing sleeve and the second sealing sleeve are arranged outside the valve core, and the cross section of the first sealing sleeve is wedge-shaped. Since the outer wall of the first sealing sleeve is wedge-shaped, if the valve core moves downward, the first sealing sleeve is also squeezed downward, so that the first sealing sleeve is more closely contacted with the housing and the valve core, and the sealing effect is better. The second sealing sleeve is located at the bottom of the valve core, so when the valve core moves downward, the second sealing sleeve will also have a certain degree of expansion.

Description

Technical Field

[0001] The invention relates to the technical field of engines, and in particular to an oil-gas conversion switch. Background Art

[0002] At present, all gasoline engines produced in China use fuel as a power source, which is highly polluting and has high fuel consumption. With the rise in oil prices and the improvement of environmental protection requirements, single-fuel gasoline engines are increasingly unable to meet the requirements of social development.

[0003] CNG is the abbreviation of compressed natural gas. CNG is a non-toxic, odorless, colorless gas. It is low-priced, does not contain carcinogens such as benzene, lead, and sulfur, has no carbon deposits in the working area, does not dilute the engine oil, has little engine wear, has abundant reserves, and is easy to store and transport. It is currently the most ideal gasoline substitute. Although gasoline engines that use CNG as fuel alone can solve the problems of fuel consumption and pollution, they are difficult to occupy the market as mature models due to outstanding problems such as poor power and inconvenient mobility. Therefore, dual-fuel generators that can be used for both oil and gas have emerged in the market.

[0004] Dual-fuel generators usually use oil-gas conversion switches to switch between gas and fuel, but CNG / fuel dual-fuel gasoline engines have appeared on the existing oil-gas conversion switch market. When in use, CNG or fuel can be selectively used as the power source according to needs, which not only solves the problems of pollution and fuel consumption, but also meets the requirements of power and convenient mobility. The gas pressure in the CNG cylinder is easily affected by factors such as temperature. When the gas pressure is insufficient, the gas will affect the performance and service life of the gasoline engine.

[0005] In the prior art, dual-fuel gasoline engines usually use an oil-gas conversion switch to switch between gas and oil, but such oil-gas conversion switches generally use rubber seals or shaft seals. However, when the oil-gas conversion switch uses rubber seals, the rubber will age and cause the switch to be difficult or impossible to rotate, which reduces the service life; if the oil-gas conversion switch uses shaft seals, ultra-high-precision shaft processing is required to achieve sealing, which increases production costs. Summary of the invention

[0006] The present invention provides an oil-gas conversion switch to solve the problem that the current rubber seal may cause rotation difficulties after long-term use, or the high-precision shaft seal may lead to high costs.

[0007] In order to achieve the above-mentioned object of the invention, the present invention provides the following technical solutions:

[0008] An oil-gas conversion switch comprises a housing, a valve core, a first sealing sleeve and a second sealing sleeve; the valve core is installed in the housing, the first sealing sleeve and the second sealing sleeve are both sleeved on the outside of the valve core, and the second sealing sleeve is located at the bottom of the first sealing sleeve; the cross section of the first sealing sleeve is wedge-shaped.

[0009] Preferably, the valve core includes an air valve section and an oil valve section, the outer diameter of the air valve section is larger than the outer diameter of the oil valve section, a first step is provided outside the air valve section, a second step is provided outside the oil valve section, a first protrusion is provided on the side of the first step, a third step is provided at the position of the housing corresponding to the first step, the third step includes a sliding section and a limiting section, the height of the sliding section from the top of the air valve section is larger than the height of the limiting section from the top of the air valve section, and the first protrusion slides in the sliding section. The first protrusion can slide in the sliding section and will be stopped by the limiting section after rotating, and the valve core is prevented from continuing to rotate by the limiting section.

[0010] Preferably, two first anti-rotation grooves are provided on the upper part of the inner wall of the housing, and a first anti-rotation protrusion is provided on the outside of the first sealing sleeve corresponding to the first anti-rotation groove; the first anti-rotation groove is located at the connection between the sliding section and the limiting section. The first sealing sleeve can prevent the first sealing sleeve from rotating with the rotation of the valve core by cooperating with the first anti-rotation protrusion and the first anti-rotation groove.

[0011] Preferably, a fifth step is provided on the inner wall of the housing corresponding to the oil valve section, three second anti-rotation grooves are provided on the fifth step, a second anti-rotation protrusion is provided on the outer side of the second sealing sleeve corresponding to the second anti-rotation groove, and the three second anti-rotation grooves are evenly arranged along the circumference of the fifth step. The second anti-rotation protrusion of the second sealing sleeve is inserted into the second anti-rotation groove to prevent the second sealing sleeve from rotating with the rotation of the valve core.

[0012] Preferably, the air valve section is provided with a first air inlet and a first air outlet, the oil valve section is provided with a first oil inlet and a first oil outlet, the first air outlet and the first oil inlet are located on the same side, and the first air inlet and the first air outlet are staggered; the first oil outlet is located at the bottom of the oil valve section; the housing is provided with a second air inlet, a second air outlet, a second oil inlet and a second oil outlet corresponding to the first air inlet, the first air outlet, the first oil inlet and the first oil outlet, respectively. The first air inlet and the first air outlet are staggered, so that the air circuit will not be connected when the oil circuit is connected. By setting the oil inlet and the air inlet relatively, the flameout state can be set in the middle, so that there will be no confusion when rotating to another state.

[0013] Preferably, a first arc-shaped groove is provided at the top of the first step, and a spring sheet is also installed on the shell, through which the valve core passes, and a second arc-shaped groove is provided on the circumference of the spring sheet, and the second groove is smoothly connected to the spring sheet; the diameter of the second groove is larger than the diameter of the first groove; the inner wall of the shell is also provided with a fourth step, and the fourth step is located on the upper part of the third step. The valve core rotates to lift up the spring sheet, and the spring sheet applies a downward force to the valve core, which can make the sealing effect better. In the process of the valve core rotating, the second groove is lifted up by the first step, giving the operator a sense of touch. When the valve core rotates into place and the second groove is located in the first groove, the spring sheet is instantly reset, and the second groove will also make a sound when it is reset, giving the operator an auditory response and a strong sense of gear position. Therefore, this structure has two advantages: the spring sheet presses the valve core to prevent leakage and enhances the sense of gear position.

[0014] Preferably, the housing is connected with an air inlet pipe, an air outlet pipe, an oil inlet pipe and an oil outlet pipe, the second air inlet is provided with a polygonal connection groove, the air inlet pipe is provided with a polygonal connector, and the air inlet pipe is not a straight pipe. If the air inlet pipe used is not a straight pipe, the polygonal connection groove can facilitate the adjustment of the direction of the air inlet pipe. Through the cooperation of the polygonal connector and the angular connection groove, the air inlet pipe can be installed at different angles to facilitate more generators to share the conversion switch.

[0015] Preferably, the number of angles of the connecting groove is twice the number of sides of the connecting head, so that each side of the connecting head can enter the connecting groove during adjustment.

[0016] Preferably, the connecting groove is octagonal and the connecting head is quadrilateral, so that the angle of the air intake pipe is adjusted every time it rotates.

[0017] Preferably, the oil inlet pipe and the oil outlet pipe are integrally formed with the housing.

[0018] Compared with the prior art, the present invention has the following beneficial effects: the present invention arranges a first sealing sleeve and a second sealing sleeve outside the valve core, and the cross-section of the first sealing sleeve is wedge-shaped. Since the outer wall of the first sealing sleeve is wedge-shaped, if the valve core moves downward, the first sealing sleeve is also squeezed downward, so that the first sealing sleeve is more closely in contact with the outer shell and the valve core, and the sealing effect is better. The second sealing sleeve is located at the bottom of the valve core, so when the valve core moves downward, the second sealing sleeve will also have a certain degree of expansion. BRIEF DESCRIPTION OF THE DRAWINGS

[0019] Figure 1 A schematic diagram of the structure of the oil-gas conversion switch provided by the present invention installed on a side panel;

[0020] Figure 2 for Figure 1 Exploded diagram of

[0021] Figure 3 An exploded view of the oil-gas conversion switch provided by the present invention;

[0022] Figure 4 The structure of the valve core is shown in Figure 2. Figure 1 ;

[0023] Figure 5 The structure of the valve core is shown in Figure 2. Figure 2 ;

[0024] Figure 6 It is a structural schematic diagram of the combination of the valve core and the spring piece;

[0025] Figure 7 The structure of the shell is shown in Figure 2. Figure 1 ;

[0026] Figure 8 The structure of the shell is shown in Figure 2. Figure 2 ;

[0027] Fig. 9 A front view of the housing provided by the present invention;

[0028] Fig.10 for Fig. 9 Sectional view of AA in the middle;

[0029] Fig.11 for Fig. 9 Cross-sectional view of the middle BB;

[0030] Fig.12 is a schematic structural diagram of a first sealing sleeve;

[0031] Fig.13 is a cross-sectional view of the first sealing sleeve;

[0032] Fig.14 is a schematic structural diagram of a second sealing sleeve;

[0033] Fig.15 A cross-sectional view of the housing provided by the present invention in a flameout state;

[0034] Fig.16 A cross-sectional view of the housing provided by the present invention in a gas path conducting state;

[0035] Fig.17 A cross-sectional view of the housing provided by the present invention in a state where the oil circuit is connected.

[0036] Markings in the figure: 1-housing, 110-third step, 111-sliding section, 112-limiting section, 113-first anti-rotation groove, 114-fifth step, 115-second anti-rotation groove, 116-second air inlet, 117-second air outlet, 118-second oil inlet, 119-second oil outlet, 121-fourth step, 122-connecting groove, 2-valve core, 21-valve section, 211-first step, 212-first protrusion, 213-first air inlet, 214-first air outlet, 215-first groove, 22- Oil valve section, 221-second step, 222-first oil inlet, 223-first oil outlet, 23-connecting section, 3-first sealing sleeve, 31-first anti-rotation protrusion, 32-third air inlet, 33-third air outlet, 4-second sealing sleeve, 41-second anti-rotation protrusion, 5-spring, 51-second groove, 6-air inlet pipe, 61-connecting head, 7-air outlet pipe, 8-oil inlet pipe, 9-oil outlet pipe, 10-first sealing ring, 11-second sealing ring, 12-third sealing ring, 13-bracket, 14-side plate, 15-knob. DETAILED DESCRIPTION

[0037] The present invention will be described in detail below in conjunction with the accompanying drawings.

[0038] In order to make the purpose, technical solution and advantages of the present invention more clearly understood, the present invention is further described in detail below in conjunction with the accompanying drawings and embodiments. It should be understood that the specific embodiments described herein are only used to explain the present invention and are not used to limit the present invention.

[0039] In the description of the present invention, it is necessary to understand that the terms "longitudinal", "lateral", "up", "down", "front", "back", "left", "right", "vertical", "horizontal", "top", "bottom", "inside", "outside", etc., indicating the orientation or position relationship, are based on the orientation or position relationship shown in the accompanying drawings, and are 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 on the present invention.

[0040] In the description of the present invention, unless otherwise specified and limited, it should be noted that the terms "installed", "connected" and "connected" should be understood in a broad sense. For example, it can be a mechanical connection or an electrical connection, or it can be the internal connection between two components. It can be a direct connection or an indirect connection through an intermediate medium. For ordinary technicians in this field, the specific meanings of the above terms can be understood according to the specific circumstances.

[0041] like Figures 1 to 16As shown, this embodiment provides an oil-gas conversion switch, including a housing 1, a valve core 2, a first sealing sleeve 3 and a second sealing sleeve 4. The valve core 2 is installed in the housing 1, the first sealing sleeve 3 and the second sealing sleeve 4 are both sleeved on the outside of the valve core 2, and the second sealing sleeve 4 is located at the bottom of the first sealing sleeve 3. The first sealing sleeve 3 and the second sealing sleeve 4 have a certain elasticity.

[0042] like Figures 4 to 6 As shown, the valve core 2 includes an air valve section 21 and an oil valve section 22. The outer diameter of the air valve section 21 is larger than the outer diameter of the oil valve section 22. A first step 211 is provided on the outside of the air valve section 21, and a second step 221 is provided on the outside of the oil valve section 22. A first protrusion 212 is provided on the side of the first step 211. A first sealing ring 10 is provided at the lower part of the first step 211, a second sealing ring 11 is provided at the upper part of the second step 221, and a third sealing ring 12 is provided at the lower part of the second step 221. A connecting section 23 is provided at the top of the valve core 2, and a connecting hole is provided on the connecting section 23. The connecting section 23 is a rectangular parallelepiped, and two adjacent faces of the connecting section 23 are connected by arcs.

[0043] A first arc-shaped groove 215 is provided at the top of the first step 211. Four first grooves 215 are evenly arranged along the circumference of the first step 211, that is, there is a 90° difference between adjacent first grooves 215. The first groove 215 and the upper plane of the first step 211 are smoothly connected by an arc.

[0044] The air valve section 21 is provided with a first air inlet 213 and a first air outlet 214, and the oil valve section 22 is provided with a first oil inlet 222 and a first oil outlet 223. The first oil outlet 214 and the first oil inlet 222 are located on the same side, and the first oil outlet 214 and the first air inlet 213 are arranged opposite to each other on both sides of the valve core 2. The first air inlet 213 and the first air outlet 214 are arranged in a staggered manner, because the first air inlet 213 and the first oil inlet 222 are 180° apart, and only the first air inlet 213 and the first air outlet 214 are not in a straight line, so that the first air inlet 213 of the air circuit is blocked when the oil circuit is unblocked; the first oil outlet 223 is located at the bottom of the oil valve section 22. Since the first air inlet 213 and the first air outlet 214 are not in a straight line, in order to facilitate the processing of the air channel in the valve core 2, the first air inlet 213 or the first air outlet buckle can be set as a long strip hole. In this embodiment, the first air inlet 213 is set as a long strip hole.

[0045] like Fig.12 and Fig.13As shown, two first anti-rotation protrusions 31 are provided on the outer side of the upper part of the first sealing sleeve 3. The two first anti-rotation protrusions 31 and the center of the first sealing sleeve 3 are located on the same straight line, that is, the two first anti-rotation protrusions 31 are 180° apart. Both ends of the first sealing sleeve 3 are open. The first sealing sleeve 3 is sleeved outside the oil valve section 22. The first sealing sleeve 3 is provided with a third air inlet 32 ​​and a third air outlet 33 corresponding to the first air inlet 213 and the first air outlet 214, respectively. The outer diameter of the first sealing sleeve 3 is larger at the top and smaller at the bottom. The first sealing ring 10 as a whole looks like a truncated cone, that is, the vertical cross section of the first sealing sleeve 3 is wedge-shaped, and the angle α between the outer wall of the first sealing ring 10 and the center line is 2°-5°, and the best is 3°. Since the outer diameter of the first sealing member is getting smaller from top to bottom, the downward movement of the wedge-shaped first sealing sleeve 3 under the pressure of the top spring sheet 5 will make the sealing effect between the first sealing member and the housing 1 and the valve core 2 better. The second sealing sleeve 4 can be in the same shape as the first sealing sleeve 3 or can be directly designed as a hollow cylinder. Since the first sealing sleeve 3 and the second sealing sleeve 4 are located between the housing 1 and the valve core 2, in order to ensure that the valve core 2 can be smoothly installed in the housing 1 after being covered with the first sealing sleeve 3 and the second sealing sleeve 4, it can also ensure that the first sealing sleeve 3 can be compressed downward under the action of force to achieve a better sealing effect.

[0046] like Figures 7 to 11 As shown, the housing 1 is provided with a second air inlet 116, a second air outlet 117, a second oil inlet 118 and a second oil outlet 119 respectively corresponding to the first air inlet 213, the first air outlet 214, the first oil inlet 222 and the first oil outlet 223. The second air inlet 116 is connected to an air inlet pipe 6, the second air outlet 117 is connected to an air outlet pipe 7, the second oil inlet 118 is connected to an oil inlet pipe 8, and the second oil outlet 119 is connected to an oil outlet pipe 9. In this embodiment, the oil inlet pipe 8 and the oil outlet pipe 9 are integrally formed with the housing 1, the air inlet pipe 6 passes through the second air inlet 116 and is connected to the housing 1 by glue or other connection methods, and the air outlet pipe 7 passes through the second air outlet 117 and is connected to the housing 1 by glue or other connection methods.

[0047] The inner wall of the housing 1 is provided with a fourth step 121, a third step 110 and a fifth step 114 in order from top to bottom. The inner diameter of the fourth step 121 is greater than that of the third step 110. The fourth step 121 is located at the upper part of the third step 110. The third step 110 and the fifth step 114 are located at the oil valve section 22. The third step 110 corresponds to the first step 211. The bottom plane of the first step 211 is flush with the plane of the third step 110, so that the valve core 2 can rotate relative to the housing 1. The housing 1 is provided with a third step 110 corresponding to the first step 211. The third step 110 includes a sliding section 111 and a limiting section 112. The height of the sliding section 111 from the top of the gas valve section 21 is greater than the height of the limiting section 112 from the top of the gas valve section 21. The first protrusion 212 slides in the sliding section 111. The sliding section 111 and the limiting section 112 each occupy half of the circumference, so that the valve core 2 can be controlled to rotate only 180° at most.

[0048] Two first anti-rotation grooves 113 are provided on the upper part of the inner wall of the housing 1, and a first anti-rotation protrusion 31 is provided on the outer part of the first sealing sleeve 3 corresponding to the first anti-rotation grooves 113; the first anti-rotation groove 113 is located at the connection between the sliding section 111 and the limiting section 112. Three second anti-rotation grooves 115 are provided on the fifth step 114, and a second anti-rotation protrusion 41 is provided on the outer part of the second sealing sleeve 4 corresponding to the second anti-rotation grooves 115, and the three second anti-rotation grooves 115 are evenly arranged along the circumference of the fifth step 114.

[0049] The housing 1 is connected with an air inlet pipe 6, an air outlet pipe 7, an oil inlet pipe 8 and an oil outlet pipe 9. The second air inlet port 116 is provided with a polygonal connection groove 122, and the air inlet pipe 6 is provided with a polygonal connector 61. The air inlet pipe 6 is not a straight pipe. Sometimes, if the air inlet pipe 6 is not a straight pipe, such as an L-tube, in order to facilitate the adjustment of the angle, the second air inlet port 116 is designed as a polygonal connection groove 122, and the air inlet pipe 6 is designed with a polygonal connector 61. Generally, the number of angles of the connection groove 122 is twice the number of sides of the connector 61. For example, if the connection groove 122 is designed as a hexagon, the connector 61 is triangular, the air inlet pipe 6 has another angle of 60°, and the air inlet pipe 6 can have six connection modes. If the connection groove 122 is designed as an octagon, the connector 61 is quadrilateral, the air inlet pipe 6 has another angle of 45°, and the air inlet pipe 6 can have eight connection modes. By cooperating with the polygonal connecting head and the angular connecting groove, the air intake pipe can be installed at different angles to facilitate more generators to share the conversion switch.

[0050] like Figure 6As shown, in order to achieve a better sealing effect, a spring sheet 5 is also installed on the upper part of the valve body, and the valve core 2 passes through the spring sheet 5. A second arc-shaped groove 51 is provided on the circumference of the spring sheet 5, and the second groove 51 is smoothly connected to the spring sheet 5; the diameter of the second groove 51 is greater than the diameter of the first groove 215. The number of the second grooves 51 can be one or two, or even the same as the number of the first grooves 215. In this embodiment, two second grooves 51 are provided on the spring sheet 5, and the two second grooves 51 are arranged opposite to each other. When the valve core 2 rotates, the first groove 215 pushes the second groove 51 upward, and the spring sheet 5 is bounced up once every 90° rotation of the valve core 2. After the rotation is in place, the spring sheet 5 returns to its original position, so that the worker has a sense of touch when rotating, and the spring sheet 5 will make a certain sound when it is bounced up and rebounded, which also prompts the rotation to be in place. The valve core 2 rotates, pushing up the spring sheet 5, and the spring sheet 5 applies a downward force to the valve core 2, which can achieve a better sealing effect. In the process of the valve core 2 rotating, the second groove 51 is lifted up by the first step 211, giving the operator a sense of touch. When the second groove 51 is in the first groove 215 after rotating, the second groove 51 will make a sound when it is reset, giving the operator an auditory response and a strong sense of gear position. Therefore, this structure has the advantages of the spring sheet pressing the valve core to prevent leakage and enhancing the sense of gear position.

[0051] like Figure 1 and Figure 2 As shown, a knob 15 is connected to the connecting section 23 of the valve core 2, a connecting hole is provided at the bottom of the knob 15, the shape of the connecting hole matches the shape of the connecting section 23, a rotating protrusion is provided at the top of the knob 15, a triangular indicator mark can be provided on the rotating protrusion to indicate the gear position, and the adjacent surface of the connecting section 23 is an arc transition. This is to facilitate the installation of the knob 15 so that the knob 15 is installed in the correct position each time. A bracket 13 is installed on the housing 1, and the bracket is connected to the side plate 14 by bolts, and finally installed in the inverter as a whole by bolts.

[0052] Working process: Fig.15 As shown in FIG. 1 , when the first oil inlet 222 is not aligned with the second oil inlet 118, and the first air inlet 213 is not aligned with the second air inlet 116, the oil-gas conversion switch is in the flameout state. When the valve core 2 is rotated 90° clockwise, the first air inlet 213 is aligned with the second air inlet 116, and the first oil inlet 222 is 180° away from the second oil inlet 118, the air circuit of the oil-gas conversion switch is open, and the oil circuit is disconnected, as shown in FIG. Fig.16 From the flameout state, rotate the valve core 2 90° counterclockwise, the first air inlet 213 and the second air inlet 116 are 180° apart, the first oil inlet 222 and the second oil inlet 118 are aligned, and the oil circuit of the oil-gas conversion switch is opened and the gas circuit is disconnected, as shown in FIG. Fig.17As shown. Since the third step 110 of the housing 1 is divided into a sliding section 111 and a limiting section 112, when the valve core 2 is instantly rotated to open the gas circuit state, if the valve core 2 continues to rotate clockwise, the limiting section 112 will stop the first protrusion 212, so that the valve core 2 cannot continue to rotate clockwise. Similarly, when the valve core 2 is rotated counterclockwise to disconnect the gas circuit of the oil-gas conversion switch, after the oil circuit is opened, the valve core 2 cannot continue to rotate counterclockwise due to the limitation of the limiting section 112. In the middle of the flameout state displacement, if you want to switch from the ventilation state to the oil flow state, you must go through the flameout state to prevent the gas circuit from being completely disconnected and the oil circuit from being opened.

[0053] When the valve core 2 is rotated, the first groove 215 pushes the second groove 51 of the spring sheet 5 upwards. After the valve core 2 is rotated 90°, the spring sheet 5 is reset. The spring sheet 5 will give the operator a certain sense of touch during the process of bouncing up. When the valve core 2 is rotated 90° and reset, the spring sheet 5 will make a sound, which will remind the operator to rotate to the right position. Since the spring sheet 5 has a certain elastic force, the spring sheet 5 always presses the valve core 2 downward. The valve core 2 is pressed downward, which drives the first sealing sleeve 3 to be pressed downward, and the second sealing sleeve 4 is also pressed downward. Since the first sealing sleeve 3 is truncated cone-shaped, after being pressed downward, the contact between the first sealing sleeve 3 and the housing 1 and the valve core 2 will be more closely fitted, and the sealing effect will be better.

[0054] The above description is only a preferred embodiment of the present invention and is not intended to limit the present invention. Any modifications, equivalent substitutions and improvements made within the spirit and principles of the present invention should be included in the protection scope of the present invention.

Claims

1. An oil-gas conversion switch, characterized in that: The valve core (2) comprises a housing (1), a valve core (2), a first sealing sleeve (3) and a second sealing sleeve (4); the valve core (2) is installed in the housing (1), the first sealing sleeve (3) and the second sealing sleeve (4) are both sleeved on the outside of the valve core (2), and the second sealing sleeve (4) is located at the bottom of the first sealing sleeve (3); the cross section of the first sealing sleeve (3) is wedge-shaped; The valve core (2) comprises an air valve section (21) and an oil valve section (22); the outer diameter of the air valve section (21) is greater than the outer diameter of the oil valve section (22); a first step (211) is provided outside the air valve section (21); a second step (221) is provided outside the oil valve section (22); a first protrusion (212) is provided on the side of the first step (211); the housing (1) is provided with a third step (110) at a position corresponding to the first step (211); the third step (110) comprises a sliding section (111) and a limiting section (112); the height of the sliding section (111) from the top of the air valve section (21) is greater than the height of the limiting section (112) from the top of the air valve section (21); the first protrusion (212) is located in the sliding section (111) and slides; a first sealing ring (10) is provided at the lower part of the first step (211).

2. The oil-gas conversion switch according to claim 1, characterized in that: Two first anti-rotation grooves (113) are provided on the upper part of the inner wall of the housing (1), and a first anti-rotation protrusion (31) is provided on the outside of the first sealing sleeve (3) corresponding to the first anti-rotation grooves (113); the first anti-rotation groove (113) is located at the connection between the sliding section (111) and the limiting section (112).

3. The oil-gas conversion switch according to claim 1, characterized in that: A fifth step (114) is provided on the inner wall of the housing (1) corresponding to the oil valve section (22), and three second anti-rotation grooves (115) are provided on the fifth step (114). A second anti-rotation protrusion (41) is provided on the outside of the second sealing sleeve (4) corresponding to the second anti-rotation groove (115), and the three second anti-rotation grooves (115) are evenly arranged along the circumference of the fifth step (114).

4. The oil-gas conversion switch according to claim 1, characterized in that: The air valve section (21) is provided with a first air inlet (213) and a first air outlet (214); the oil valve section (22) is provided with a first oil inlet (222) and a first oil outlet (223); the first air outlet (214) and the first oil inlet (222) are located on the same side; the first air inlet (213) and the first air outlet (214) are arranged in a staggered manner; the first oil outlet (223) is located at the bottom of the oil valve section (22); and the housing (1) is provided with a second air inlet (116), a second air outlet (117), a second oil inlet (118) and a second oil outlet (119) respectively corresponding to the first air inlet (213), the first air outlet (214), the first oil inlet (222) and the first oil outlet (223).

5. The oil-gas conversion switch according to claim 1, characterized in that: A first arc-shaped groove (215) is provided at the top of the first step (211); a spring sheet (5) is also installed on the housing (1); the valve core (2) passes through the spring sheet (5); a second arc-shaped groove (51) is provided on the circumference of the spring sheet (5); the second groove (51) and the spring sheet (5) are smoothly connected; the diameter of the second groove (51) is greater than the diameter of the first groove (215); and a fourth step (121) is also provided on the inner wall of the housing (1); the fourth step (121) is located at the upper part of the third step (110).

6. The oil-gas conversion switch according to claim 4, characterized in that: The housing (1) is connected to an air inlet pipe (6), an air outlet pipe (7), an oil inlet pipe (8) and an oil outlet pipe (9); the second air inlet (116) is provided with a polygonal connecting groove (122); the air inlet pipe (6) is provided with a polygonal connecting head (61); and the air inlet pipe (6) is not a straight pipe.

7. The oil-gas conversion switch according to claim 6, characterized in that: The number of corners of the connecting groove (122) is twice the number of sides of the connecting head (61).

8. The oil-gas conversion switch according to claim 7, characterized in that: The connection groove (122) is octagonal, and the connection head (61) is quadrilateral.

9. The oil-gas conversion switch according to claim 6, characterized in that: The oil inlet pipe (8) and the oil outlet pipe (9) are integrally formed with the housing (1).

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