CN209385744U - A kind of novel pressure adjusting valve system - Google Patents
A kind of novel pressure adjusting valve system Download PDFInfo
- Publication number
- CN209385744U CN209385744U CN201822092836.5U CN201822092836U CN209385744U CN 209385744 U CN209385744 U CN 209385744U CN 201822092836 U CN201822092836 U CN 201822092836U CN 209385744 U CN209385744 U CN 209385744U
- Authority
- CN
- China
- Prior art keywords
- valve body
- piston
- air
- clamp nut
- pressure
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Active
Links
Abstract
The utility model belongs to diesel oil and natural gas double-fuel spraying system technical field, and in particular to a kind of novel pressure adjusting valve system.The novel pressure adjusts valve system, including regulation valve body, piston, intermediate and air valve body, piston is equipped in the regulation valve body, intermediate and air valve body, intermediate is between piston and air valve body, one end that regulation valve body is located at piston is equipped with the second clamp nut, the first clamp nut is equipped with positioned at air valve body one end, the air valve body and the first clamp nut surround to form inlet chamber, air cavity is balanced by air valve body, intermediate and regulation valve body surround to be formed, piston, intermediate and regulation valve body surround to form pressure-releasing chamber, natural gas enters from the 6th air flue, it is flowed out from pressure release air flue.The beneficial effect is that: natural gas air inlet can be finely controlled, make pressure difference keep stablizing, structure is effectively reliable, securely and reliably；Solve the problems, such as that gas pressure control fluctuation in the market is big.
Description
Technical field
The utility model belongs to diesel oil and natural gas double-fuel spraying system technical field, and in particular to a kind of novel pressure
Adjust valve system.
Background technique
Currently marketed medium-weight vehicle mainly uses diesel oil as fuel, this kind of burning efficiency of internal combustion engine is substantially low
High pressure direct injection natural gas in cylinder technology (i.e. high-pressure common rail in 39%, with the publication of six discharge standard of state, using diesel oil as single-fuel
System) matching cost and technical difficulty gradually increase, while also bringing the growth in cost.
With the adjustment of national energy structure, and the promotion to emission request, traditional with gasoline and diesel oil is burning
The internal combustion engine of medium will gradually decrease.Natural gas is abundant in china natural resources, gradually starts to be applied to as the alternative fuel of diesel oil
Automobile market.But current natural gas internal combustion engine is gas-duct jetting, is lighted by spark plug, efficiency of combustion is lower than
39%, and discharge and be difficult to meet the emission request gradually promoted.
A kind of in-cylinder direct-jet technology of achievable dual fuel injection can effectively improve burning by the way of compression ignition
Efficiency.The double fuel direct injection technology first sprays a small amount of diesel oil in the combustion chamber, after compression ignition, is promoted in combustion in IC engine room
Temperature, ignite the natural gas then sprayed, then carries out work by combustion.The technology, can by efficiency of combustion promoted to 42% and
PM value and the discharge of NOx can be reduced, more to clean, more economical fuel injection system for IC engine.
In above-mentioned double fuel in-cylinder direct-jet system, there is the pressure-regulating valve for controlling gas pressure, but pressure
Regulating system is more demanding to pressure controling precision, and there are no mature pressure-regulating valve products currently on the market, most of to produce
Product are still in sample stage, and its structure is complicated, processing difficulties, and gas pressure is poor to the followability of diesel pressure, pressure difference
Unstable, easy to wear, existing product performance and reliability can not meet the requirement of bifuel system.
Utility model content
In order to make up for the defects of the prior art, the utility model provides a kind of to overcome defect of the existing technology
Novel pressure adjusts valve system.
The utility model is achieved by the following technical solution:
A kind of novel pressure adjusting valve system, including regulation valve body, piston, intermediate and air valve body, the regulation valve body
Interior to be equipped with piston, intermediate and air valve body, between piston and air valve body, one end that regulation valve body is located at piston is set intermediate
There is the second clamp nut, is located at air valve body one end and is equipped with the first clamp nut, the piston extends in the second clamp nut, the
One end that two clamp nuts are located at piston is equipped with piston separation blades, and second is equipped between piston separation blades and the second clamp nut and compresses spiral shell
Plug, piston separation blades, the second clamp nut and the second compression plug screw surround to form oil pocket, diesel oil from the second clamp nut upper end into
Hydraulic fluid port enters, and from the oil outlet outflow on regulation valve body, the air valve body and the first clamp nut surround to form inlet chamber, naturally
Gas enters from the air inlet on regulation valve body, enters inlet chamber by the 5th air flue, flat from the first air flue flow direction on air valve body
Weigh air cavity, and balance air cavity is surrounded by air valve body, intermediate and regulation valve body to be formed, and natural gas enters from the 4th air flue, from adjusting
Gas outlet outflow on valve body, piston, intermediate and regulation valve body surround to form pressure-releasing chamber, and natural gas enters from the 6th air flue,
It is flowed out from pressure release air flue.
Further, the piston is located at the end in the second clamp nut equipped with the first nut and the second nut, the second spiral shell
Piston spring is cased between female and piston separation blades.
Further, the first sealing ring is equipped between second clamp nut and regulation valve body.
Further, the 4th sealing ring is equipped between first clamp nut and regulation valve body.
Further, the second sealing ring and the first support ring are cased between regulation valve body inner wall on the piston.
Further, intermediate is corresponded on the regulation valve body inner wall is located at the side of piston equipped with positioning pin.
Further, the second support ring and third sealing ring are cased on the intermediate between regulation valve body, on intermediate
It is equipped with seal block at the 6th air flue, and compresses plug screw by first and compresses.
Further, the 5th sealing ring is equipped between the air valve body and regulation valve body inner wall.
Further, the third air flue end of the air valve is equipped with sealing plug.
The beneficial effects of the utility model are:
(1) present invention can finely control natural gas air inlet, make pressure difference keep stablizing, than currently existing in market
On pressure adjustment valve it is more reasonable；
(2) sealing structure of the present invention is effectively reliable, solves the problems, such as that current pressure-regulating valve product leakage is serious；
(3) present invention can carry out decompression protection, and the opening and closing of pressure release are fast when Balance Air cavity pressure is excessive
Speed, securely and reliably；
(4) present invention has filled up the country in diesel gas bifuel system, and the blank of pressure adjustment valve uses
Natural gas improves gas pressure to diesel pressure by means of the pressure difference of spring force in piston two sides with diesel oil collective effect
Followability, improve the control precision of gas pressure, solve the problems, such as in the market gas pressure control fluctuation it is big；
(5) difficulty of processing is simplified, the complexity of oil duct, air flue arrangement is reduced, improves the reliability of product and resistance to
Long property has greatly pushed the technological progress and mass process of diesel gas dual fuel injection system internal combustion engine.
Detailed description of the invention
The utility model will be further described below with reference to the accompanying drawings.
Attached drawing 1 is the cross-sectional view of the utility model；
Attached drawing 2 is the utility model third air flue partial view；
Attached drawing 3 is the utility model diesel oil, natural gas flow graph in internal combustion engine；
Attached drawing 4 is the utility model natural gas flow graph when shutting down；
Attached drawing 5 is the modification structures form figure of the utility model air valve and intermediate.
In figure, 1 regulation valve body, 2 pistons, 3 intermediates, 4 seal blocks, 5 first compression plug screws, 6 air valves, 7 air valve bodies, 8
Sealing plug, 9 first clamp nuts, 10 spring for valve, 11 gaskets, 12 third clamp nuts, 13 positioning pins, 14 piston separation blades,
15 second compression plug screws, 16 piston springs, 17 second clamp nuts, 18 first nuts, 19 second nuts, 20 first sealing rings,
21 second sealing rings, 22 first support rings, 23 third sealing rings, 24 second support rings, 25 the 4th sealing rings, 26 inlet chambers, 27
Oil pocket, 28 balance air cavitys, 29 gas outlets, 30 first air flues, 31 second air flues, 32 third air flues, 33 the 4th air flues, 34 the 5th gas
Road, 35 air inlets, 36 the 5th sealing rings, 37 pressure release air flues, 38 oil inlets, 39 oil outlets, 40 upper limit planes, 41 lower limit planes,
42 pressure-releasing chambers, 43 the 6th air flues, 44 adjustment gaskets.
Specific embodiment
Attached drawing 1-5 is a kind of specific embodiment of the utility model.A kind of novel pressure of the utility model adjusts valve system,
Including regulation valve body 1, piston 2, intermediate 3 and air valve body 7, piston 2, intermediate 3 and air valve body are equipped in the regulation valve body 1
7, for intermediate 3 between piston 2 and air valve body 7, one end that regulation valve body 1 is located at piston 2 is equipped with the second clamp nut 17, position
It is equipped with the first clamp nut 9 in 7 one end of air valve body, the piston 2 extends in the second clamp nut 17, the second clamp nut 17
Piston separation blades 14 are equipped with positioned at one end of piston 2, second is equipped between piston separation blades 14 and the second clamp nut 17 and compresses plug screw
15, piston separation blades 14, the second clamp nut 17 and the second compression encirclement of plug screw 15 form oil pocket 27, and diesel oil is from the second clamp nut
The oil inlet 38 of 17 upper ends enters, and flows out from the oil outlet 39 on regulation valve body 1, the air valve body 7 and the first clamp nut 9 packet
It enclosing to form inlet chamber 26, natural gas enters from the air inlet 35 on regulation valve body 1, enter inlet chamber 26 by the 5th air flue 34,
From the first air flue 30 flow direction balance air cavity 28 on air valve body 7, air cavity 28 is balanced by air valve body 7, intermediate 3 and regulation valve body 1
It surrounds and is formed, natural gas enters from the 4th air flue 33, flows out from the gas outlet 29 on regulation valve body 11, piston 2,3 and of intermediate
The encirclement of regulation valve body 1 forms pressure-releasing chamber 42, and natural gas enters from the 6th air flue 43, flows out from pressure release air flue 37.
Further, the piston 2 is located at the end in the second clamp nut 17 equipped with the first nut 18 and the second nut 19,
Piston spring 16 is cased between second nut 19 and piston separation blades 14.
Further, the first sealing ring 20 is equipped between second clamp nut 17 and regulation valve body 1.
Further, the 4th sealing ring 25 is equipped between first clamp nut 9 and regulation valve body 1.
Further, the second sealing ring 21 and the first support ring 22 are cased between 1 inner wall of regulation valve body on the piston 2.
Further, intermediate 3 is corresponded on 1 inner wall of regulation valve body is located at the side of piston 2 equipped with positioning pin 13.
Further, the second support ring 24 and third sealing ring 23 are cased between regulation valve body 1 on the intermediate 3, in
It is located at the 6th air flue 43 on mesosome 3 and is equipped with seal block 4, and compresses plug screw 5 by first and compress.
Further, the 5th sealing ring 36 is equipped between 1 inner wall of the air valve body 7 and regulation valve body.
Further, 32 end of third air flue of the air valve 6 is equipped with sealing plug 8.
A kind of novel pressure of the utility model adjusts valve system, and the seal block 4 on intermediate 3 is compressed by first
Plug screw 5 is pressed on intermediate 3；Piston separation blades 14 are pressed on regulation valve body 1 by the second compression plug screw 15；Air valve body 7 is logical
The first clamp nut 9 is crossed to be pressed on regulation valve body 1；Positioning pin 13 is to limit the moving upwards in regulation valve body 1 of intermediate 3
Maximum position；Air valve 6 and air valve body 7 are even to match, by the relative motion of air valve 6 and air valve body 7, adjusting third air flue 32 and the
The circulation area of two air flues 31, third air flue 32 is triangular in shape, circulation area can be made more accurately to change, to accurately control
The air inflow of natural gas.
16 lower end of piston spring is installed in piston separation blades 14, and upper end is installed on the first nut 19,18 He of the first nut
The precompressed height of the adjustable piston spring 16 of first nut 19, and can be mutually and tight, piston spring 16 generates one to piston 2
Fixed axial force, piston 2 can move up and down under the action of piston spring 16, to realize the adjusting to 2 position of piston.Gas
10 lower end of valve spring is installed on air valve body 7, and upper end is installed on gasket 11, and gasket 11 passes through third clamp nut 12 and tightly exists
On air valve 6, spring for valve 10 generates certain axial force to air valve 6, and 6 upper surface of air valve is kept in contact with 3 lower end surface of intermediate,
Air valve 6 can drive intermediate 3 to move up and down under the action of spring for valve 10, to realize to 6 position of air valve, intermediate 3
The adjusting of position.
Piston 2 is matched with regulation valve body 1, intermediate 3 with regulation valve body 1, is equipped with the second sealing ring 21 on the piston 2
With the first support ring 22, realize to the sealing between bavin oil and gas, to avoid the phase of bavin oil and gas two media
Mutually pollution is equipped with third sealing ring 23 and the second support ring 24 on intermediate 3, realizes between balance air cavity 28 and pressure-releasing chamber 42
Sealing.It is equipped between regulation valve body 1 and the first clamp nut 9, the second clamp nut 17, air valve body 7 and regulation valve body 1
Sealing ring, to prevent the leakage of diesel oil, natural gas.
Piston separation blades 14, the second clamp nut 17, second compress the encirclement of plug screw 15 and form oil pocket 27, and diesel oil is compressed from second
The oil inlet 38 of 17 upper end of nut enters, and flows out from the oil outlet 39 on regulation valve body 1.Air valve body 7, the first clamp nut 9 packet
It enclosing to form inlet chamber 26, natural gas enters from the air inlet 35 on regulation valve body 1, by the 5th air flue 34, into inlet chamber 26,
From the first air flue 30 flow direction balance air cavity 28 on air valve body 7.Air valve body 7, intermediate 3, the encirclement of regulation valve body 1 form Balance Air
Chamber 28, natural gas enter from the 4th air flue 33, flow out from the gas outlet 29 on regulation valve body 1.Piston 2, intermediate 3, regulating valve
The encirclement of body 1 forms pressure-releasing chamber 42, and natural gas enters from the 6th air flue 43, from the outflow of pressure release air flue 37, when high-pressure diesel is from oil inlet
After mouthfuls 38 enter oil pockets 27, intracavitary diesel pressure rises, so that piston 2 be pushed to move downward, 2 lower end sealing cone of piston with it is close
Packing block 4 keeps in sealing contact, pushes intermediate 3, air valve 6 to move downward, at this time the third air flue 32 and air valve body on air valve 6
Relative motion occurs for the second air flue 31 on 7, with moving downward for piston 2, the circulation of third air flue 32 and the second air flue 31
Area gradually increases, and the high-pressure natural gas of the second air flue 31 is entered from inlet chamber 26, by the circulation area, into balance air cavity
28, reversed axial force is generated to piston 2, finally, diesel pressure, gas pressure and spring force generate balance, so that
Gas pressure is stable simultaneously to be limited in a certain range, the gas of the steady pressure, by gas outlet 29, into filter and
Gas rail, to realize the pressure variation synchronous with diesel pressure in gas rail, when diesel pressure is excessive, piston 2 continues downwards
It moves, under limiting condition, 3 bottom surface of intermediate is in contact with lower limit plane 41,2 stop motion of piston.
Conversely, pressure decline, piston 2 move upwards in oil pocket 27, third air flue when the decline of 38 pressure of diesel oil feeding mouth
32 gradually decrease with the circulation area of the second air flue 31, so that diesel pressure, gas pressure and spring force reach new balance,
The final pressure realized in gas rail also corresponding change.
When balance the natural pressure fluctuation in air cavity 28 it is excessive when, will cause that about 2 pressure difference of piston is excessive, and piston 2 is held
Continuous to move upwards, third air flue 32 and the circulation area of the second air flue 31 are gradually reduced, until third air flue 32 and the second air flue
31 are detached from, and the air inlet of compressed natural gas is closed.When continuing up, 3 upper surface of intermediate is contacted with positioning pin 13, intermediate
3 with 6 stop motion of air valve, when piston 2 continues up, the sealing cone of the sealing cone of 2 lower end of piston and seal block 4
It is detached from, natural gas passes through the 6th air flue 43, into pressure-releasing chamber 42, to flow into low-pressure channel by pressure release air flue 37, makes to balance
Gas pressure in air cavity 28, pressure-releasing chamber 42 reduces.Air cavity 28 and pressure-releasing chamber 42 are balanced after the pressure release of part, cavity pressure drop
Low, piston 2 moves downward, and the sealing cone of 2 lower end of piston contacts again with seal block 4, and pressure-releasing chamber 42 recloses, thus
Gas pressure, diesel pressure and spring force reach new balance.
When engine is shut down, the pressure of diesel oil feeding mouth 38 is drastically reduced, and piston 2 continues upward movement, and air valve 6 is in
Mesosome 3 is moved upwards by the spring-force driven dual of spring for valve 10, and third air flue 32 and the circulation area of the second air flue 31 gradually subtract
Small, until third air flue 32 and the second air flue 31 are detached from, the air inlet of compressed natural gas is closed.When continuing up, intermediate 3
Upper surface is contacted with positioning pin 13, intermediate 3 and 6 stop motion of air valve, when piston 2 continues up, 2 lower end of piston it is close
The sealing cone for sealing the conical surface and seal block 4 is detached from, and natural gas passes through the 6th air flue 43, into pressure-releasing chamber 42, thus by letting out
It calms the anger and 37 flows into low-pressure channels, complete pressure release to compressed natural gas.Finally, piston 2 is in contact with upper limit plane 40, piston
2 stop motions.
Referring to shown in attached drawing 5, this pressure-regulating valve further comprises the modification structures of intermediate 3 Yu air valve 6, and air valve 6 is in
Mesosome 3 is designed as integrally-built air valve 6, and seal block 4 is fixed on air valve 6 by the first compression plug screw 5, spring for valve 10
It being installed between air valve 6 and air valve body 7, air valve 6 is pressed on piston sealing cone by the spring force of spring for valve 10,
Adjustment gasket 45 is equipped between spring for valve 10 and air valve 6, the working principle of the modification structures is same as above.
The utility model is not limited to above embodiment, anyone, which should learn, makes under the enlightenment of the utility model
There is same or similar technical solution with the utility model, each fall within the protection scope of the utility model.
Technology that the utility model is not described in detail, shape, construction portion are well-known technique.
Claims (9)
1. a kind of novel pressure adjusts valve system, including regulation valve body, piston, intermediate and air valve body, characterized in that the tune
It saves and is equipped with piston, intermediate and air valve body in valve body, for intermediate between piston and air valve body, regulation valve body is located at piston
One end is equipped with the second clamp nut, is located at air valve body one end and is equipped with the first clamp nut, the piston extends to the second compression spiral shell
In mother, one end that the second clamp nut is located at piston is equipped with piston separation blades, and the is equipped between piston separation blades and the second clamp nut
Two compress plug screws, and piston separation blades, the second clamp nut and the second compression plug screw surround to form oil pocket, and diesel oil is from the second clamp nut
The oil inlet of upper end enters, from the oil outlet outflow on regulation valve body, the air valve body and the first clamp nut surround to be formed into
Air cavity, natural gas enter from the air inlet on regulation valve body, enter inlet chamber by the 5th air flue, from the first gas on air valve body
Road flow direction balance air cavity, balance air cavity are surrounded by air valve body, intermediate and regulation valve body and are formed, natural gas from the 4th air flue into
Enter, flowed out from the gas outlet on regulation valve body, piston, intermediate and regulation valve body surround to form pressure-releasing chamber, and natural gas is from the 6th
Air flue enters, and flows out from pressure release air flue.
2. a kind of novel pressure according to claim 1 adjusts valve system, compressed it is characterized in that: the piston is located at second
End in nut is equipped with the first nut and the second nut, is cased with piston spring between the second nut and piston separation blades.
3. a kind of novel pressure according to claim 1 adjusts valve system, it is characterized in that: second clamp nut and tune
It saves and is equipped with the first sealing ring between valve body.
4. a kind of novel pressure according to claim 1 adjusts valve system, it is characterized in that: first clamp nut and tune
It saves and is equipped with the 4th sealing ring between valve body.
5. a kind of novel pressure according to claim 1 or 2 adjusts valve system, it is characterized in that: on the piston with adjusting
The second sealing ring and the first support ring are cased between valve interior wall.
6. a kind of novel pressure according to claim 1 adjusts valve system, it is characterized in that: right on the regulation valve body inner wall
The side for answering intermediate to be located at piston is equipped with positioning pin.
7. a kind of novel pressure according to claim 1 adjusts valve system, it is characterized in that: on the intermediate with regulating valve
It is cased with the second support ring and third sealing ring between body, is located at the 6th air flue on intermediate and is equipped with seal block, and pass through the
One, which compresses plug screw, compresses.
8. a kind of novel pressure according to claim 1 adjusts valve system, it is characterized in that: the air valve body and regulation valve body
The 5th sealing ring is equipped between inner wall.
9. a kind of novel pressure according to claim 1 adjusts valve system, it is characterized in that: the third air flue end of the air valve
Portion is equipped with sealing plug.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201822092836.5U CN209385744U (en) | 2018-12-13 | 2018-12-13 | A kind of novel pressure adjusting valve system |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201822092836.5U CN209385744U (en) | 2018-12-13 | 2018-12-13 | A kind of novel pressure adjusting valve system |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN209385744U true CN209385744U (en) | 2019-09-13 |
Family
ID=67871819
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201822092836.5U Active CN209385744U (en) | 2018-12-13 | 2018-12-13 | A kind of novel pressure adjusting valve system |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN209385744U (en) |
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN115325182A (en) * | 2022-10-14 | 2022-11-11 | 江苏德邦流体控制有限公司 | Electric control valve protection device |
| WO2023147654A1 (en) * | 2022-02-01 | 2023-08-10 | Westport Fuel Systems Canada Inc. | Differential pressure regulator |
-
2018
- 2018-12-13 CN CN201822092836.5U patent/CN209385744U/en active Active
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| WO2023147654A1 (en) * | 2022-02-01 | 2023-08-10 | Westport Fuel Systems Canada Inc. | Differential pressure regulator |
| CN115325182A (en) * | 2022-10-14 | 2022-11-11 | 江苏德邦流体控制有限公司 | Electric control valve protection device |
Similar Documents
| Publication | Publication Date | Title |
|---|---|---|
| CN209385744U (en) | A kind of novel pressure adjusting valve system | |
| CN109505713A (en) | A kind of novel pressure regulating system | |
| CN101892901A (en) | Vector multiplication cross engine | |
| CN109519589A (en) | A kind of novel pressure regulating valve structure | |
| CN209293928U (en) | A kind of novel pressure regulating system | |
| CN204984614U (en) | Engine intake piston compression ratio governing system | |
| CN205243655U (en) | Dimethyl ether co -combustion system in advance preblends valve controlling means | |
| CN104595530B (en) | Pressure-regulating device for dual-fuel engine | |
| KR101144504B1 (en) | Fuel injection pump with variable injection pressure chamber | |
| CN101709665A (en) | Interface compression engine | |
| CN209705387U (en) | A kind of novel pressure regulating valve structure | |
| CN104454180A (en) | Internal combustion engine power device, engine and running methods of internal combustion engine power device | |
| CN103032156A (en) | Expansion working medium energy multilevel utilization device for internal combustion engine and using method thereof | |
| CN104061058A (en) | Premixing compression internal-combustion engine and operation method thereof | |
| CN204420205U (en) | Duel fuel engine pressure regulator | |
| KR20200130832A (en) | All working conditions Channel division Time division Supercharged intake variable compression ratio technology of internal combustion engine | |
| CN101839165B (en) | Boundary compression engine | |
| CN105756740A (en) | Piezoelectric control and gas distribution system | |
| CN205744036U (en) | Piezoelectricity controls air distribution system | |
| CN105756829A (en) | Combined mechanical fuel oil injection and pressurizing piezoelectric fuel gas injection mixed fuel injection device | |
| CN204175438U (en) | A kind of internal combustion engine power plant, motor | |
| CN205714521U (en) | Combined mechanical oil spout-supercharging piezoelectricity jet hybrid fuel jet device | |
| CN205714327U (en) | Double piezoelectric hydraulics drive booster-type air distribution system | |
| CN212508465U (en) | Oil regulator for two-stroke IC engine | |
| CN201448167U (en) | Fuel saving system with automatically-controlled back pressure |
Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| GR01 | Patent grant | ||
| GR01 | Patent grant |