CN214198128U - Oil-gas mixing valve - Google Patents

Abstract

The utility model discloses an oil-gas mixing valve, which comprises a valve body, first check valve, the oil circuit proportional valve, second check valve and the interface that produces oil, the valve body includes the oil feed passageway, inlet channel and the passageway that produces oil, first check valve, oil circuit proportional valve and the interface that produces oil are from up placing the passageway that produces oil in proper order in down, the oil circuit proportional valve includes the through-hole, the through-hole includes first through-hole and second through-hole, first through-hole is less than second through-hole and handing-over department and forms the structure of keeping out, the second check valve is located the second through-hole and keeps out in keeping out structurally, first check valve and second check valve can follow the activity of upper and lower direction, the top of second through-hole is the oil-gas mixing district, the oil-gas mixing district is located an oil interface below. Compared with the prior art, reset downwards with the help of the second check valve and keep out in keeping out structurally to prevent in lubricating oil and the gas reflux to first through-hole, still for first check valve slows down the bearing load, thereby improved the utility model discloses an oil-gas lubrication's of oil-gas mixing valve stability and life.

Description

Oil-gas mixing valve

Technical Field

The utility model relates to an oil-gas lubrication system field especially relates to an oil-gas mixing valve.

Background

With the improvement of the production level of modern industry, mechanical products are developing towards high speed, high efficiency, heavy load, energy conservation, high automation and long service life, so that higher requirements are made on the lubricating effect of the mechanical products. Meanwhile, with the enhancement of environmental awareness and the requirement of sustainable development of people, oil-gas lubrication becomes a development direction of high-speed electric spindle bearing lubrication. The oil-gas lubrication system can continuously supply quantitative lubricating oil, improve the lubrication reliability, improve the machining performance and prolong the service life of the bearing. The sealing air provided by the system enhances the cooling effect while protecting the bearings from external contamination. On the other hand, the oil consumption of the oil-gas lubrication system is far less than that of the traditional lubrication mode, and the oil-gas lubrication system has unique advantages in the aspects of saving energy, reducing environmental pollution and the like.

The oil-gas mixing valve is used as a key component of an oil-gas lubricating system, and the structural design of the oil-gas mixing valve directly determines the lubricating effect of the oil-gas lubricating system. When the airflow flows in the pipeline at a high speed, the drop-shaped lubricant is continuously thinned under the action of the air, is attached to the pipe wall and is conveyed forwards at a relatively low speed, and a continuous and uniform oil film is formed at the tail end of the oil-gas pipeline and is finally conveyed to a friction surface.

The existing oil-gas mixing valve is lack of a one-way valve between the gas circuit and the oil circuit, so that umbrella-shaped glue on the oil circuit bears too large pressure when the oil circuit reflows, the umbrella-shaped glue deforms to influence the displacement of the proportional valve, the oil quantification is inaccurate, the stability of oil-gas lubrication is influenced, and in addition, the service life of the oil-gas mixing valve is shortened.

Therefore, there is a need for an air-fuel mixing valve with improved stability of air-fuel lubrication and improved service life to overcome the above-mentioned drawbacks.

SUMMERY OF THE UTILITY MODEL

An object of the utility model is to provide an improve lubricated stability of oil-gas and improve life's oil-gas mixing valve.

In order to achieve the above object, the oil-gas mixing valve of the present invention comprises a valve body, a first check valve, an oil-way proportional valve, a second check valve and an oil outlet port, wherein the valve body comprises an oil inlet channel and an air inlet channel which are arranged along the length direction of the valve body, the oil inlet channel and the air inlet channel are arranged at intervals along the width direction, the valve body is further provided with an oil outlet channel arranged along the up-down direction, the oil outlet channel is respectively communicated with the oil inlet channel and the air inlet channel, the first check valve, the oil-way proportional valve and the oil outlet port are arranged in the oil outlet channel from the bottom up in sequence, the oil-way proportional valve comprises a through hole for passing oil, the through hole comprises a first through hole and a second through hole from the bottom up in sequence, the outer diameter of the first through hole is smaller than the outer diameter of the second through hole, and the junction of the first through hole and the second through hole forms a blocking structure, the second one-way valve is located in the second through hole and selectively abuts against the abutting structure, the first one-way valve and the second one-way valve can move in the vertical direction, an oil-gas mixing area is arranged above the second through hole, the air inlet channel is communicated with the oil-gas mixing area, the oil-gas mixing area is located below the oil outlet interface and communicated with the oil outlet interface, a gap is formed between the oil-way proportional valve and the oil outlet channel to form an oil storage space, and the oil-way proportional valve is provided with a through hole for communicating the oil storage space with the first through hole.

Preferably, the first check valve includes a top pressure head and a first elastic member, the outer diameter of the top pressure head increases gradually from bottom to top, and the first elastic member is located below the top pressure head.

Preferably, the pushing head sequentially comprises a head part and a body part from bottom to top, the body part is of a truncated cone structure, a stepped structure is formed at the joint of the head part and the body part, and the first elastic part is sleeved on the head part and abuts against the stepped structure.

Preferably, the body part is provided with an annular groove with an upward opening, the annular groove comprises a first groove wall and a second groove wall, the first groove wall is vertically arranged, the second groove wall is obliquely arranged, and the second groove wall is located outside the first groove wall.

Preferably, the second check valve includes a stop block and a second elastic member from bottom to top in sequence, and the second elastic member constantly has a tendency of driving the stop block to stop downward against the stop structure.

Preferably, the oil-way proportional valve comprises a piston rod, a metering part, a moving part and a third elastic part, the piston rod is connected below the metering part, the piston rod is provided with the first through hole, the metering part is provided with the second through hole, the moving part is sleeved outside the piston rod and can move in the up-and-down direction, and the third elastic part is sleeved on the moving part and constantly has a tendency of driving the moving part to move downwards.

Preferably, the oil-way proportional valve further comprises a check ring and a follow-up sealing ring which are sequentially sleeved on the piston rod from bottom to top, the follow-up sealing ring is located below the moving member, and the follow-up sealing ring and the moving member move together relative to the piston rod.

Preferably, the oil-gas mixing device further comprises a valve cover connected above the oil-way proportional valve, the valve cover covers the second through hole and is provided with an oil outlet communicated with the second through hole, the diameter of the oil outlet is smaller than that of the second through hole, and the valve cover comprises a flow guide column extending upwards out of the oil-gas mixing area.

Preferably, the gas regulating valve further comprises a gas regulating bolt, the valve body is provided with a blind hole which is vertically arranged, the gas regulating bolt is arranged in the blind hole, the blind hole is communicated with the gas inlet channel, the valve body further comprises a first gas leading-in channel and a second gas leading-in channel, the first gas leading-in channel is arranged along the horizontal direction and communicated with the gas-oil mixing zone, the second gas leading-in channel is vertically arranged and communicated with the blind hole, and the first gas leading-in channel is vertically connected with the second gas leading-in channel.

Preferably, the number of the oil outlet channels is at least two, and all the oil outlet channels are spaced from each other along the length direction of the valve body.

Compared with the prior art, the utility model discloses an oil-gas mixing valve is with the help of first check valve and second check valve, when stopping to the oil feed passageway fuel feeding, restore to the throne downwards with the help of the second check valve and keep out in keeping out structurally, thereby prevent lubricating oil and gas reflux to in the first through-hole, with the help of first check valve, thereby prevent that oil from flowing back to the oil feed passageway, the second check valve slows down the bearing load for first check valve, thereby slow down the damage degree of first check valve, thereby the accurate ration that has improved oil circuit proportional valve goes out oil and has improved the lubricated stability of oil-gas, in addition, still improved the utility model discloses an oil-gas mixing valve's life.

Drawings

Fig. 1 is a schematic view of the three-dimensional structure of the oil-gas mixing valve of the present invention.

Fig. 2 is a front view structure schematic diagram of the oil-gas mixing valve of the present invention.

Fig. 3 is a schematic sectional view taken along section line a-a in fig. 2.

Fig. 4 is a schematic cross-sectional view of the valve body of the oil-gas mixing valve of the present invention, which is cut along the section line a-a in fig. 2.

Fig. 5 is a schematic side view of the valve body of the oil-gas mixing valve of the present invention.

Fig. 6 is a cross-sectional view taken along section line B-B in fig. 5.

Fig. 7 is a cross-sectional view taken along section line C-C in fig. 5.

Detailed Description

In order to explain technical contents and structural features of the present invention in detail, the following description is made with reference to the embodiments and the accompanying drawings.

Referring to fig. 1 to 4, the oil-gas mixing valve 100 of the present invention includes a valve body 1, a first check valve 2, an oil-way proportional valve 3, a second check valve 4, an oil outlet port 5, and a plurality of plugs 6. Wherein, valve body 1 is including all along oil feed passageway 11 and inlet channel 12 that the length direction of valve body 1 set up, and oil feed passageway 11 and inlet channel 12 still are the spaced apart setting along the width direction. Specifically, in this embodiment, the oil inlet channel 11 and the air inlet channel 12 are further staggered in the up-down direction, and specifically, the oil inlet channel 11 is lower than the air inlet channel 12. The valve body 1 is further provided with an oil outlet channel 13 arranged along the up-down direction, and the oil outlet channel 13 is respectively communicated with the oil inlet channel 11 and the air inlet channel 12. It can be understood that the oil inlet channel 11 is connected with an external oil charging device, the air inlet channel 12 is connected with an external air charging device, lubricating oil enters the oil outlet channel 13 through the oil inlet channel 11, compressed air enters the oil outlet channel 13 through the air inlet channel 12, and the lubricating oil is better output through the oil outlet channel 13 under the boosting of the compressed air. Specifically, the plug 6 blocks one side of the air inlet channel 12, and the other side of the air inlet channel 12 is connected with an external inflator. The plug 6 plugs one side of the oil inlet channel 11, and the other side of the oil inlet channel 11 is communicated with an external oil filling device. The first one-way valve 2, the oil way proportional valve 3 and the oil outlet interface 5 are sequentially arranged in the oil outlet channel 13 from bottom to top. Oil circuit proportional valve 3 includes the through-hole that the fuel feeding passed through, the through-hole is from up including first through-hole 311 and second through-hole 321 in proper order down, the external diameter size of first through-hole 311 is less than the external diameter size of second through-hole 321, the handing-over department of first through-hole 311 and second through-hole 321 forms one and keeps off structure 322, second check valve 4 is located second through-hole 321 and selectively keeps off on keeping off structure 322, first check valve 2 and second check valve 4 all can be followed the up-and-down direction activity, the top of second through-hole 321 is oil-gas mixture district 14, inlet channel 12 is linked together with oil-gas mixture district 14, oil-gas mixture district 14 is located the interface of producing oil 5 below and is linked together with the interface of producing oil 5. The oil metering valve 3 forms an oil storage space 18 with a clearance from the oil outlet passage 13, and the oil metering valve 3 is provided with a through hole 37 communicating the oil storage space 18 with the first through hole 311. The through hole 37 divides the first through hole 311 into an upper branch 311a and a lower branch 311 b. When the oil is pumped, the grease enters the oil outlet channel 13 from the oil inlet channel 11, the lubricating oil has oil pressure and upwards jacks the first one-way valve 2, the oil storage space 18 becomes small, so that the lubricating oil in the oil storage space 18 enters the upper branch 311a through the through hole 37 and upwards jacks the second one-way valve 4, so that the lubricating oil enters the oil-gas mixing area 14, and the lubricating oil is communicated with the oil-gas mixing area 14 through the air inlet channel 12, so that the lubricating oil is discharged from the oil outlet port 5 by means of compressed air after reaching the oil-gas mixing area 14 to reach a lubricating point. More specifically, the following:

referring to fig. 3, the first check valve 2 includes a pushing head 21 and a first elastic member 22, the outer diameter of the pushing head 21 increases gradually from bottom to top, and the first elastic member 22 is located below the pushing head 21. Specifically, the pushing head 21 sequentially includes a head portion 211 and a body portion 212 from bottom to top, the body portion 212 is a truncated cone structure, a step structure 213 is formed at a junction of the head portion 211 and the body portion 212, and the first elastic member 22 is sleeved on the head portion 211 and abuts against the step structure 213. It can be understood that the oil outlet channel 13 includes a first receiving cavity 131 for the first check valve 2 to move up and down, the first receiving cavity 131 includes a first hole 1311 and a second hole 1312, a diameter of the first hole 1311 is smaller than a diameter of the second hole 1312, a first stop shoulder 1313 is formed at a boundary between the first hole 1311 and the second hole 1312, the first elastic member 22 has a tendency to drive the pushing head 21 to move down, and the stepped structure 213 selectively stops against the first stop shoulder 1313. With the aid of the first check valve 2, when oil is filled into the oil inlet channel 11, the lubricating oil pushes the first elastic member 22 and the top pressure head 21, so as to fill the oil storage space 18, and at the same time, the top pressure head 21 abuts against the lower part of the oil passage proportional valve 3 and covers the first through hole 311; when the oil filling is stopped, the top pressing head 21 pulls the top pressing head 21 to move downward under the elastic recovery action of the first elastic member 22 to close the first receiving cavity 131, thereby preventing the lubricating oil from leaking. Preferably, in this embodiment, the body 212 is provided with an upward-opening annular groove 2121, the annular groove 2121 includes a first groove wall 21211 vertically disposed and a second groove wall 21212 obliquely disposed, and the second groove wall 21212 is located outside the first groove wall 21211. By means of the annular groove 2121, during downward movement of the ram 21, lubricating oil can enter the annular groove 2121, thereby accelerating the closing of the ram 21 by depression, and thus preventing leakage of lubricating oil more quickly.

Referring to fig. 3, the second check valve 4 sequentially includes a resisting block 41 and a second elastic member 42 from bottom to top, and the second elastic member 42 always tends to drive the resisting block 41 to downwards resist against the resisting structure 322. When oil is filled, the lubricating oil passes through the first through hole 311 to jack the abutting block 41 and compress the second elastic member 42, enters the second through hole 321, exits from the second through hole 321 to reach the oil-gas mixing area 14, and when the oil filling is stopped, the second elastic member 42 pushes the abutting block 41 to move downwards due to elastic recovery so as to abut against the abutting structure 322. With the help of second check valve 4 to when stopping filling oil, prevent that the gas and the lubricating oil in oil-gas mixture district 14 from getting into first through-hole 311, reached the effect that alleviates first check valve 2 and bore, and improved the oil circuit ration valve 3 ration accuracy of producing oil, thereby improved lubricated stability of oil-gas. In addition, it is also possible to prevent the gas from entering the first through hole 311 to deteriorate the operation of the entire oil-gas mixing valve 100.

Referring to fig. 3, the oil metering valve 3 includes a piston rod 31, a metering member 32, a moving member 33 and a third elastic member 34. The piston rod 31 is connected below the metering piece 32, the piston rod 31 is provided with a first through hole 311, the metering piece 32 is provided with a second through hole 321, the moving piece 33 is sleeved outside the piston rod 31 and can move up and down, and the third elastic piece 34 is sleeved on the moving piece 33 and constantly has a tendency of driving the moving piece 33 to move downwards. It will be appreciated that the piston rod 31 and the metering member 32 are fixed relative to the valve body 1. The bottom surface of the metering member 32 is protruded with a limit ring 323 for limiting the movement of the moving member 33, and the stroke of the moving member 33 is controlled by the limit ring 323, thereby controlling the quantitative output of the lubricating oil. For example, the protrusion length of the limiting ring 323 is controlled, i.e. the stroke of the moving member 33 is controlled, and when the protrusion length of the limiting ring 323 is longer, the stroke of the moving member 33 is shorter, i.e. the oil storage is less; when the protruding length of the stopper 323 is shorter, the stroke of the moving member 33 is longer, that is, the more oil is stored.

Referring to fig. 3, the oil metering valve 3 further includes a retainer ring 36 and a follower seal 35 sequentially sleeved on the piston rod 31 from bottom to top, the follower seal 35 is located below the moving member 33, and the follower seal 35 and the moving member 33 move together relative to the piston rod 31. It can be understood that the oil outlet channel 13 further includes a second receiving cavity 132 for the piston rod 31 to be mounted, and a space is provided between the piston rod 31 and a cavity wall of the second receiving cavity 132, and the space directly forms the oil storage space 18. The moving member 33 and the follower seal 35 are movably provided in the oil storage space 18. It can be understood that, when oil is filled, the moving member 33 and the follower sealing ring 35 move upward, so that the oil storage space 18 becomes smaller, and the oil in the oil storage space 18 is forced to enter the through hole 37 and then enter the upper branch 311 a; when oil filling is stopped, the moving member 33 and the follower seal 35 move downward, the oil storage space 18 becomes larger, at this time, the first check valve moves downward, so that the passage into the first through hole 311 is opened, and the grease enters from the lower branch 311b, passes through the through hole 37, and finally flows into the oil storage space 18 for storage. Specifically, the diameter of the second receiving cavity 132 is larger than that of the second receiving cavity 132, a second abutting shoulder 133 structure is disposed at a boundary between the second receiving cavity 132 and the first receiving cavity 131, and the retainer ring 36 is supported on the second abutting shoulder 133 structure. More specifically, the follower seal ring 35 is a Y-shaped ring, which has a good sealing function, and seals a small portion of grease under the follower seal ring.

Referring to fig. 3, the oil-gas mixing valve 100 of the present invention further includes a valve cover 7 connected above the oil metering valve 3. Specifically, the valve cover 7 is attached above the metering member 32 and covers the second through hole 321. Specifically, the valve cover 7 is provided with the oil outlet hole 71 communicated with the second through hole 321, and the diameter of the oil outlet hole 71 is smaller than that of the second through hole 321, so that the gas in the oil-gas mixing area 14 above the valve cover 7 is not easy to enter the second through hole 321. Preferably, in this embodiment, the valve cover 7 includes a flow guiding column 72 extending upward from the oil-gas mixing area 14, and the flow of air around the flow guiding column 72 is caused by the flow guiding column 72, so that the gas in the oil-gas mixing area 14 forms an annular air flow, and the lubricating oil can flow from the oil-gas mixing area 14 to the oil outlet port 5 more quickly. For example, in the present embodiment, the outer diameter of the diversion column 72 is gradually reduced from bottom to top, so as to optimize the diversion effect and make the airflow move from bottom to top.

Referring to fig. 3 and 7, the oil-gas mixing valve 100 of the present invention further includes a gas adjusting bolt 8. The valve body 1 is provided with blind holes 15 which are arranged up and down, the gas adjusting bolt 8 is arranged in the blind hole 15, and the blind hole 15 is communicated with the air inlet channel 12. Specifically, in the present embodiment, the gas adjusting bolt 8 is in threaded connection with the blind hole 15, and the deeper the gas adjusting bolt 8 is screwed into the blind hole 15, the less the flow rate of the gas entering the oil-gas mixing zone 14 is; on the contrary, the shallower the depth of the screwing blind hole 15 of the gas adjusting bolt 8, the flow of the gas entering the oil-gas mixing area 14 is increased, and the amount of the gas entering the oil-gas mixer is adjusted by adjusting the screwing of the gas adjusting bolt into the body. The valve body 1 further comprises a first gas introducing channel 16 and a second gas introducing channel 17 which are communicated with the oil-gas mixing area 14, the first gas introducing channel 16 is arranged along the horizontal direction and communicated with the oil-gas mixing area 14, the second gas introducing channel 17 is vertically arranged and communicated with the blind hole 15, and the first gas introducing channel 16 is vertically connected with the second gas introducing channel 17. It will be understood that the stopper 6 blocks the other side of the first gas introduction passage 16, thereby preventing gas leakage. With the help of first gaseous water conservancy diversion passageway and the gaseous water conservancy diversion passageway of second, abandoned traditional inclined hole setting to the processing degree of difficulty of having simplified valve body 1 has reduced the processing cost.

Referring to fig. 1, fig. 2, fig. 6 and fig. 7, the number of the oil outlet channels 13 is four, however, in other embodiments, the number of the oil outlet channels 13 may be one, two, three or five, and thus, the invention is not limited thereto. Specifically, all the oil outlet passages 13 are spaced apart from each other in the length direction of the valve body 1. It can be understood that each oil outlet channel 13 is provided with a first gas inlet channel 16 and a second gas inlet channel 17 corresponding to the oil outlet channel. The oil inlet passage 11 communicates with each oil outlet passage 13.

Referring to fig. 3, the oil outlet 5, the metering member 32 and the outer side surface of the gas adjusting bolt 8 are all provided with a sealing groove, and a sealing ring 9 is installed in each sealing groove to prevent the leakage of the lubricating oil or the gas.

The working principle of the oil-gas mixing valve 100 of the present invention is explained with reference to the accompanying drawings:

oil path: the oil inlet channel 11 is filled with lubricating oil, after the lubricating oil enters the oil outlet channel 13, the first check valve 2 is jacked open, the lubricating oil enters the second accommodating cavity 132 and pushes the moving member 33 and the follow-up sealing ring 35 to move upwards until the moving member 33 abuts against the limiting ring 323, so that the oil storage space 18 is reduced, grease in the oil storage space 18 enters the upper branch 311a through the through hole 37, then enters the metering member 32, jacks the second check valve 4, enters the second through hole 321, exits from the oil outlet 71 and enters the oil-gas mixing area 14.

Gas circuit: the inlet passage 12 is charged with gas which passes through the second gas introduction passage 17 and the first gas introduction passage 16 in this order to enter the oil-gas mixing zone 14.

Oil gas outlet: the lubricating oil in the oil-gas mixing area 14 is discharged from the oil outlet interface 5 under the assistance of gas.

Resetting: when oil is stopped to fill the oil inlet channel 11, the second check valve 4 is reset under the action of the second elastic piece 42, the resisting block 41 is resisted on the resisting structure 322, and lubricating oil above the resisting block 41 is stored in the second through hole 321; the moving member 33 is reset under the elastic restoring force of the third elastic member 34, the moving member 33 and the follower seal ring 35 abut against the retainer ring 36, the pushing ram 21 is reset under the action of the first elastic member 22, the pushing ram 21 abuts against the first abutting shoulder 1313, the lower branch 311b of the piston rod 31 is opened, and the grease located below the retainer ring 36 enters the lower branch 311, passes through the through hole 37 and flows back to the oil storage space 18, so that the oil storage operation is completed. With the help of second check valve 4, when preventing that lubricating oil and gas from returning first through-hole 311, reduced first check valve 2's load, thereby increased the utility model discloses an oil-gas mixing valve 100's life.

Compared with the prior art, the utility model discloses an oil-gas mixing valve 100 is with the help of first check valve 2 and second check valve 4, when stopping to oil feed passageway 11 oil supply, with the help of second check valve 4 downward reset keeps off on retaining structure 322, thereby prevent lubricating oil and gas reflux to in the first through-hole 311, with the help of first check valve 2, thereby prevent that oil from flowing back to oil feed passageway 11, second check valve 4 slows down the bearing load for first check valve 2, thereby slows down the damage degree of first check valve 2, thereby the accurate ration that has improved oil circuit proportional valve 3 goes out oil and has improved oil-gas lubrication's stability, in addition, still improved the utility model discloses an oil-gas mixing valve 100's life.

The above disclosure is only a preferred embodiment of the present invention, and the scope of the claims of the present invention should not be limited thereby, and all the equivalent changes made in the claims of the present invention are intended to be covered by the present invention.

Claims (10)

1. An oil-gas mixing valve is characterized by comprising a valve body, a first check valve, an oil way proportional valve, a second check valve and an oil outlet interface, wherein the valve body comprises an oil inlet channel and an air inlet channel which are arranged along the length direction of the valve body, the oil inlet channel and the air inlet channel are arranged at intervals along the width direction, the valve body is also provided with an oil outlet channel which is arranged along the upper and lower directions, the oil outlet channel is communicated with the oil inlet channel and the air inlet channel respectively, the first check valve, the oil way proportional valve and the oil outlet interface are arranged in the oil outlet channel from bottom to top in sequence, the oil way proportional valve comprises a through hole through which oil passes, the through hole sequentially comprises a first through hole and a second through hole from bottom to top, the outer diameter of the first through hole is smaller than that of the second through hole, and a blocking structure is formed at the joint of the first through hole and the second through hole, the second one-way valve is located in the second through hole and selectively abuts against the abutting structure, the first one-way valve and the second one-way valve can move in the vertical direction, an oil-gas mixing area is arranged above the second through hole, the air inlet channel is communicated with the oil-gas mixing area, the oil-gas mixing area is located below the oil outlet interface and communicated with the oil outlet interface, a gap is formed between the oil-way proportional valve and the oil outlet channel to form an oil storage space, and the oil-way proportional valve is provided with a through hole for communicating the oil storage space with the first through hole.

2. The oil-gas mixing valve as claimed in claim 1, wherein the first check valve comprises a top pressure head and a first elastic member, the top pressure head is arranged such that the outer diameter of the top pressure head increases gradually from bottom to top, and the first elastic member is located below the top pressure head.

3. The oil-gas mixing valve according to claim 2, wherein the top head comprises a head part and a body part in sequence from bottom to top, the body part is of a cone frustum structure, a stepped structure is formed at the joint of the head part and the body part, and the first elastic part is sleeved on the head part and abuts against the stepped structure.

4. The air-fuel mixing valve as defined in claim 3, wherein the body portion is provided with an annular groove with an upward opening, the annular groove comprising a first groove wall arranged vertically and a second groove wall arranged obliquely, the second groove wall being located outside the first groove wall.

5. The oil-gas mixing valve according to claim 1, wherein the second check valve comprises a resisting block and a second elastic member in sequence from bottom to top, and the second elastic member has a tendency to drive the resisting block to resist downwards against the resisting structure.

6. The oil-gas mixing valve according to claim 1, wherein the oil-way proportional valve comprises a piston rod, a metering part, a moving part and a third elastic part, the piston rod is connected below the metering part, the piston rod is provided with the first through hole, the metering part is provided with the second through hole, the moving part is sleeved outside the piston rod and can move up and down, and the third elastic part is sleeved on the moving part and constantly has a tendency of driving the moving part to move downwards.

7. The oil-gas mixing valve according to claim 6, wherein the oil-way proportional valve further comprises a retainer ring and a follower seal ring which are sequentially sleeved on the piston rod from bottom to top, the follower seal ring is located below the moving member, and the follower seal ring and the moving member move together relative to the piston rod.

8. The oil-gas mixing valve according to claim 1, further comprising a valve cover connected above the oil-way proportional valve, wherein the valve cover covers the second through hole and is provided with an oil outlet communicated with the second through hole, the diameter of the oil outlet is smaller than that of the second through hole, and the valve cover comprises a guide column which extends upwards out of the oil-gas mixing area.

9. The oil-gas mixing valve according to claim 1, further comprising a gas adjusting bolt, wherein the valve body is provided with a blind hole which is vertically arranged, the gas adjusting bolt is arranged in the blind hole, the blind hole is communicated with the gas inlet channel, the valve body further comprises a first gas inlet channel and a second gas inlet channel which are communicated with the oil-gas mixing area, the first gas inlet channel is arranged along the horizontal direction and communicated with the oil-gas mixing area, the second gas inlet channel is vertically arranged and communicated with the blind hole, and the first gas inlet channel is vertically connected with the second gas inlet channel.

10. The air-fuel mixing valve of claim 1, wherein there are at least two of the oil outlet passages, all of the oil outlet passages being spaced apart from each other along a length of the valve body.

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