CN2332464Y - Cyclone dust removal centrifuge - Google Patents
Cyclone dust removal centrifuge Download PDFInfo
- Publication number
- CN2332464Y CN2332464Y CN 98201992 CN98201992U CN2332464Y CN 2332464 Y CN2332464 Y CN 2332464Y CN 98201992 CN98201992 CN 98201992 CN 98201992 U CN98201992 U CN 98201992U CN 2332464 Y CN2332464 Y CN 2332464Y
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- 239000000428 dust Substances 0.000 title abstract description 17
- 230000005540 biological transmission Effects 0.000 claims description 7
- 239000000463 material Substances 0.000 claims description 2
- 239000002184 metal Substances 0.000 claims description 2
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 abstract description 8
- 230000008901 benefit Effects 0.000 abstract description 3
- 238000005265 energy consumption Methods 0.000 abstract description 3
- 239000002912 waste gas Substances 0.000 abstract description 2
- 239000002245 particle Substances 0.000 description 19
- 238000013461 design Methods 0.000 description 9
- 238000000034 method Methods 0.000 description 5
- 230000000694 effects Effects 0.000 description 4
- 239000007788 liquid Substances 0.000 description 4
- 230000001133 acceleration Effects 0.000 description 3
- 239000007789 gas Substances 0.000 description 3
- 238000006477 desulfuration reaction Methods 0.000 description 2
- 230000023556 desulfurization Effects 0.000 description 2
- 238000010586 diagram Methods 0.000 description 2
- 230000009286 beneficial effect Effects 0.000 description 1
- 238000004140 cleaning Methods 0.000 description 1
- 238000005516 engineering process Methods 0.000 description 1
- 238000002474 experimental method Methods 0.000 description 1
- 230000002349 favourable effect Effects 0.000 description 1
- 230000005484 gravity Effects 0.000 description 1
- 239000003595 mist Substances 0.000 description 1
- 239000000203 mixture Substances 0.000 description 1
- 238000002663 nebulization Methods 0.000 description 1
- 238000012545 processing Methods 0.000 description 1
- 238000004062 sedimentation Methods 0.000 description 1
- 239000000779 smoke Substances 0.000 description 1
- 239000007921 spray Substances 0.000 description 1
- 238000005406 washing Methods 0.000 description 1
- 238000003466 welding Methods 0.000 description 1
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Abstract
The utility model belongs to the technical field of remove dust, a improvement to waste gas dust collector is related to. The utility model comprises a shell, a pinwheel 3 driven by a motor 11, and an elbow 8 connected with the shell, which is characterized in that a core cylinder 7 coaxial with the pinwheel is arranged in the shell, a plurality of holes are arranged on the core cylinder, a certain gap is arranged between the core cylinder 7 and the shell, the lower segment of the core cylinder 7 is connected with the elbow 8, the pinwheel 3 extends into the core cylinder 7, and a streamline core hammer 6 is arranged in the core cylinder 7. The utility model has the advantages of little or no water consumption, low energy consumption, no dust-removing dead angle and high dust-removing efficiency.
Description
The utility model belongs to the dedusting technology field, relates to the improvement to the waste gas dedusting device.
Commonwealth of Independent States (CIS) patent SU1808360-AI " water spray revolves the brush smoke eliminator " (hereinafter to be referred as patent 1) discloses a kind of dust arrester, belongs to the washing method dedusting, and water consumption is big, and energy consumption is big.And the pinwheel core has the dedusting dead angle, influences efficiency of dust collection.Chinese patent CN96219594.4 " pipeline rotator type dust arrester " (hereinafter to be referred as patent 2) is the patent of the utility model applicant in preceding acquisition.The dedusting path of this device is less, only limits to pinwheel thickness, in from 20 to 50 centimetres, has limited the raising of efficiency of dust collection.
The purpose of this utility model provides a kind of spiral-flow dust-removing centrifugal machine, to improve the efficient of pipeline dust arrester, cuts down the consumption of energy.
The technical solution of the utility model is: a kind of spiral-flow dust-removing centrifugal machine, comprise one by just revolving the housing that chamber, dedusting chamber and ash bucket are formed, just revolve the air inlet 1 that the chamber has tangential admission, revolve just and to fix a motor 11 on the chamber, can drive one or one group of pinwheel 3 rotation by axle 12, an elbow 8 as the gas outlet that is connected with ash bucket is arranged, it is characterized in that
(1) in the dedusting chamber, fixing a core tube 7, it is the hollow cylinder of being made by metal or nonmetallic materials, its shape can be straight tube, perhaps frustum, the combination of perhaps straight tube and frustum, porose on the barrel, the shape in hole is not limit, the bore of single hole is 3～50 millimeters, and the percent opening of barrel is 1～80%, and core tube 7 keeps coaxial with pinwheel 3, gap between core tube 7 and the dedusting chamber is with the upper end minimum, be 3～50 millimeters,, be 0.5～1.5 times of elbow diameter in the lower end maximum, the upper port next-door neighbour of core tube 7 is just revolved the chamber lower edge, lower port is coaxial relative with elbow 8, and core tube 7 lower port diameters are more than or equal to the diameter of elbow 8
(2) core tube 7 is by being fixed on supporting units support on dedusting chamber and/or the elbow, that made by rod member or lath,
(3) in core tube 7, fixing a hollow core hammer 6, it is made up of for three sections top, throat and bottom, top is the sphere or the paraboloid of revolution, throat is a straight cylinder shape, the bottom is the paraboloid of revolution, the major and minor axis length ratio of core hammer 6 is 1～4, and the maximum gauge that core is hammered 6 throats into shape is 0.25～1.5 times of elbow 8 diameters.
The utility model has the advantages that: compare with patent 1, the utility model belongs to dry method or semi-dry desulfurization dedusting, the few or water consumption not of water consumption, and energy consumption is little; The pinwheel center does not have the dedusting dead angle, the dust removal efficiency height.Compare with patent 2, direction and mode that air-flow enters are more reasonable, help dedusting; The dedusting cavity length increases, and is provided with core tube and core hammer, has improved efficiency of dust collection, makes efficiency of dust collection of the present utility model be higher than patent 2.
Description of drawings.
Fig. 1 is a kind of embodiment of the utility model " vertical spiral-flow dust-removing centrifugal machine " structure diagram.
Fig. 2 is the A-A profile of Fig. 1.
Fig. 3 is another kind of embodiment " horizontally-inclined spiral-flow dust-removing centrifugal machine " structure diagram of the utility model.
Fig. 4 is spiral-flow dust-removing centrifugal machine dust-cleaning principle figure.
Fig. 5 is spiral-flow dust-removing centrifugal machine dedusting chamber inward turning Field Characteristics figure.
Below in conjunction with accompanying drawing the utility model is described in further details.Referring to Fig. 1,2.Fig. 1 provides the example structure according to the vertical spiral-flow dust-removing centrifugal machine of the utility model conceptual design.By one by just revolving the housing that chamber, dedusting chamber and ash bucket are formed.Just revolve the chamber and be positioned at housing top, have the air inlet 1 of tangential admission on it.Referring to Fig. 2, air inlet 1 with just revolve the chamber and be and cut the stream scroll casing shape and join.Fixing a motor 11 just revolving the chamber tip exterior, it can drive pinwheels 3 rotations by putting in the power transmission shaft 12 that just revolves the chamber.In order to help the preliminary rotation of air-flow, simultaneously in order to reduce the distance between bearing and the pinwheel 3, just revolve can install in the chamber one with pinwheel 3 coaxial, hollow helping revolve post 2.Its top is cylindric, is fixed on just to revolve the chamber top end face, and its underpart is a cone barrel.Motor transmission shaft 12 passes to help and revolves post 2 and be connected with pinwheel 3.Can and help between the awl tube that revolves post 2 bottoms bearing is installed at power transmission shaft 12, reduce the distance between bearing and the pinwheel 3, make driving shaft 12 become 2 supports, help the dynamic balancing of rotary part.
The housing stage casing of vertical spiral-flow dust-removing centrifugal machine is the dedusting chamber.Fixing a core tube 7 in the dedusting chamber, a kind of embodiment of core tube 7 is inversed taper platform shape, punches on the barrel, and percent opening is 25～80%.Its range of taper is 2～20 degree, and its upper port is connected with the dedusting chamber, and the next-door neighbour is just revolved the lower edge in chamber, and its lower port is connected with housing or elbow 8.
Second kind of embodiment of core tube 7 is made up of two sections, and epimere is a straight tube, and hypomere is an inversed taper platform.The percent opening of the straight tube of epimere is 25～80%, and the gap between the dedusting chamber is 10～300 millimeters, and the percent opening of hypomere frustum is 25～80%.Core tube 7 upper port and dedusting chamber wall are fixed by rod member, and core tube 7 lower port are connected with housing or elbow 8.
The third embodiment of core tube 7 is made up of for three sections upper, middle and lower, referring to Fig. 1.Upper and lower section is inversed taper platform shape, and the stage casing is a straight cylinder.The percent opening of epimere frustum is 10～30%, in, the percent opening of hypomere is 25～80%.Gap delta between core tube stage casing and the dedusting chamber is 10～300 millimeters.The upper port of core tube 7 next-door neighbour is just revolved the chamber lower edge, and keeps 1～5 mm clearance to be connected between the wall of dedusting chamber, and hypomere is connected with elbow 8.
Among three kinds of embodiment of above-mentioned core tube 7, can core tube 7 be supported on dedusting chamber central authorities by being fixed on support component on dedusting chamber and/or the elbow, that made by rod member, auricle or lath, the quantity and the position of support member are not limit.When using lath to support, for reducing the resistance to air-flow, the plate face should be parallel to core tube longitudinal axis.Satisfying under the prerequisite of requirement of strength, placing the two ends of core tube 7 more favourable support member.Between the upper port of core tube 7 and the dedusting chamber wall little gap is only arranged, be easy to realize support and connection, for example use spot welding or auricle to connect.The lower port of core tube 7 is coaxial relative with the port of elbow 8, its position relation can be one of following several situations: one, core tube 7 lower port are slightly larger than the port of elbow 8, this moment, core tube 7 lower port were entangled the port of elbow 8, certain clearance to occur between core barrel and the bend wall, the scope of this gap is 0～300 millimeter.Preferably be connected core tube 7 on the wall of dedusting chamber this moment.Two, core tube 7 lower port equal the port of elbow 8, and can directly be connected core tube 7 with elbow 8 this moment.Three, allow to keep 2～300 mm distance between core tube 7 and elbow 8 two-port.Can be connected core tube 7 on dedusting chamber wall or the elbow 8 this moment.
Recommend to adopt the core tube of being made up of three sections of upper, middle and lower, it has very high efficiency of dust collection and better manufacturability.
Table 1 provides the core tube design parameter of several three sections compositions and selects example.
Table 1 core tube 7 design parameter examples
| δ(mm) | The epimere percent opening | The stage casing percent opening | The hypomere percent opening | Pass | |
| Example 1 | 30 | 5％ | 40％ | 40％ | Slotted hole |
| Example 2 | 50 | 5％ | 35％ | 35％ | Circular hole |
| Example 3 | 50 | 30％ | 30％ | 30％ | Circular hole |
| Example 4 | 100 | 10％ | 40％ | 30％ | Slotted hole |
The range of choice of core tube 7 three segment length is: 100～500 millimeters of epimeres, 500～3000 millimeters in stage casing, 100～2000 millimeters of hypomeres.Concrete numerical value is looked the tolerance of design processing and is determined.Based on the stage casing, decide according to the gap between stage casing and the housing by epimere when design for core tube 7, is principle with the resistance that reduces eddy flow as far as possible.The position that hypomere is hammered 6 afterbodys into shape according to stage casing diameter, elbow 8 diameters and core is determined, is principle with the resistance that reduces eddy flow as far as possible also.
The effect of core tube 7 is:
The first, form narrow slit effect." as long as slit is enough little, the air-flow opposite joint external space is not influence just " this rule has been verified in hydromechanical experiment already.Hole on the core tube 7 is equivalent to slit, and therefore, the core tube can greatly limit the influence of swirling eddy to core tube outskirt, simultaneously, can allow the particle of centrifugal arrival core barrel again under centrifugal action, and the hole of passing on the core barrel enters the decanting zone.
The second, form the particles settling district.As among Fig. 4,5 3., the annular space between core tube 7 and dedusting chamber is a space that the eddy flow field intensity is very little, momentum is very little.Particle is gathered in this zone, is easy to sedimentation under the gravity effect.
Pinwheel 3 is installed in driving shaft 12 terminations, and is coaxial with core tube 7.Pinwheel 3 can be positioned at outside the core tube 7, also can put in the core tube 7.The benefit that puts in the core tube 7 is, helps alleviating the wearing and tearing of high-speed rotational to housing.
Fixing a hollow core hammer 6 in core tube 7, it is made up of for three sections top, throat and bottom.Top is the sphere or the paraboloid of revolution, and throat is a straight cylinder shape, and the bottom is the paraboloid of revolution.The major axis of core hammer 6 is that portion is to the maximum length of bottom from it, and minor axis is a throat diameter, and major and minor axis length ratio is 1～4.The maximum gauge that core is hammered 6 throats into shape is 0.25～1.5 times of elbow 8 diameter D.Table 2 provides the design parameter example of several core hammers 6.
Table 2 core is hammered 6 design parameter embodiment into shape
| D(mm) | Throat diameter (mm) | Axial ratio | Upper profile (mm) | Lower profile | Wall thickness | |
| Example 5 | 360 | 260 | 2 | Φ 400 spheres | Parabolic | 6 |
| Example 6 | 500 | 280 | 1.9 | Φ 480 spheres | Parabolic | 12 |
| Example 7 | 620 | 300 | 1.8 | Φ 500 spheres | Parabolic | 12 |
| Example 8 | 720 | 350 | 1.6 | Φ 520 spheres | Parabolic | 10 |
The type of attachment of core hammer 6 and core tube 7 can be varied, and its design principle is to guarantee enough rigidity, reduce resistance and opposing attrition and attack to air-flow as far as possible.Generally can be distributed in one or two planes vertical with 2～6 rod members or lath with the longitudinal axis.For example be uniformly distributed along the circumference with three rod members, an end is fixed on core tube 7 inwalls, and the other end is connected with core hammer 6.Core hammer 6 can use four rod members when longer, hammers 6 front portions into shape at core for three and is uniformly distributed along the circumference, the afterbody of the 4th fixed core hammer 6.When using lath to support, the plate face should have certain inclination angle along the air-flow direction of rotation, to reduce the resistance to eddy flow.Can fix with two laths less core hammer; Bigger core hammer can be uniformly distributed along the circumference fixing with three laths.
The position of core hammer 6 is more near pinwheel 3, and efficiency of dust collection is high more.When needs use nozzle 5 atomizing of liquids, need reserve the space that nozzle 5 is installed.
The contribution of 6 pairs of dedustings of core hammer can be analyzed theoretically.Referring to Fig. 4,5, v among Fig. 4
oBeing the axial velocity of particle, 1. is the forced vortex district, 2. is free vortex district, 3. is the extended boundary layer, also cries the particles settling district.Curve a does not have core to hammer the centrifugal curve of particle of simplification in 6 o'clock into shape, and curve b is provided with the particles of simplifying after the core hammer 6 to increase whiz innermost being line.Among Fig. 5, v
tBe the particle tangential velocity, a
rBe radial acceleration, r
aBe the elbow radius, ω is an eddy flow field angular speed, and r is the radial position of particle.With axial velocity v
oEnter the particle in dedusting chamber,, obtained the tangential velocity v that size differs greatly through behind the pinwheel 3
tThe closer to the wheel hub of pinwheel 3, tangential velocity is more little.v
t=ω r, ω are eddy flow field angular speed, and r is the radial position of particle.Tangential velocity v
tBig more, centrifugal acceleration a
rBig more, the centrifugal force that particle obtains is big more, and easy more 1. freedom of entry vortex district is 2. from the forced vortex district.Freedom of entry vortex district particle 2. just is not easy to flow out elbow 8.The position r that particle initially enters eddy flow field is more little, and is easy of more elbow 8 outflows.Can clearly be seen that by Fig. 4; be provided with after the core hammer 6, make the centrifugal curve of particle become b by a, the position, field that particle passes through in eddy flow field is brought up to core and is hammered into shape more than 6 throat radius; the tangential velocity that particle obtains improves greatly, thereby the free vortex of easier arrival district 2..
The lower port of core tube 7 is relative with the upper port as the elbow 8 of gas outlet.Elbow 8 passes through on the ash bucket 9 that is fixed on lower housing portion mutually, and ash hole 10 is arranged at the bottom of ash bucket 9.
The utility model not water carries out dry method dust, also can carry out the semi-dry desulfurization dedusting with low amounts of water.Can between pinwheel 3 and core hammer 6, fix a nozzle 5, towards pinwheel 3.Liquid stream transfers hoop to by the nozzle conical surface and is the film shape and ejects, after meeting with eddy flow, and uniform atomizing in centrifugal field.Nebulization efficiency height, mist pearl only are used to capture trickle grit, so gas liquid ratio can be controlled in below 1: 0.005, water consumption reduces greatly relatively.
Referring to Fig. 3.This is the horizontally-inclined spiral-flow dust-removing centrifugal machine embodiment according to the utility model design.Wherein, only some variation of hull shape.Housing is still formed by just revolving chamber, dedusting chamber and ash bucket, is that with vertical spiral-flow dust-removing centrifugal machine institute difference ash bucket 9 is connected with the side in dedusting chamber.On the dedusting chamber sidewall that is covered by ash bucket 9, also have the hole, the dedusting chamber is communicated with ash bucket.The shape and the combining form thereof of institute's perforate are not limit, and generally can adopt circular hole.Percent opening is 10～90%.In addition, the structure of miscellaneous part is identical with the corresponding part of vertical spiral-flow dust-removing centrifugal machine with effect.Because the dedusting chamber is longer, allow to connect two ash buckets in its side, be beneficial to ash discharge.
The dust removal process of the utility model spiral-flow dust-removing centrifugal machine is: dust-contained airflow from air inlet 1 cut flow at the beginning of revolve the chamber, utilize intake velocity to carry out preliminary cyclone dust removal.If help and revolve post, but the secondary air rotation.Fall into the grit decanting zone 3. the gap in the grit that is removed frustum and dedusting chamber from core tube 7.In the dedusting chamber, whirlwind is under the acceleration of pinwheel 3, and adjusting becomes the stabilized uniform eddy flow, the centrifugal motion of aggravation grit.Centrifugal pass free vortex district 2., arrive the particle of core tube 7, pass the hole on the core tube 7, enter the 3. free settling of grit decanting zone, fall into ash bucket 9.When nozzle had been installed, by swirling flow atomizing, droplet captured trickle grit, has strengthened the diameter of particle, accelerates its centrifugal motion from the liquid of nozzle ejection.The core hammer is restricted to the above position of core hammer throat radius with all grits and flows through, the tangential velocity that acquisition enlarges markedly, thus move to the core barrel quickly.The process core is hammered the air-flow of 7 throats into shape, becomes dustless air-flow at least in core hammer throat diameter projected area scope, is derived by elbow 8.3. the grit that settles down from the decanting zone falls into ash bucket 9, collects through ash hole 10 and enters ash bin.
The utility model can be with dedusting cut diameter d
50Reduce to below 0.6 micron, efficiency of dust collection is reached more than 96%.
Claims (7)
1, a kind of spiral-flow dust-removing centrifugal machine, comprise one by just revolving the housing that chamber, dedusting chamber and ash bucket are formed, just revolve the air inlet [1] that the chamber has tangential admission, revolve just and to fix a motor [11] on the chamber, can drive a pinwheel [3] rotation by axle [12], an elbow as the gas outlet that is connected with ash bucket [8] is arranged, it is characterized in that
(1) in the dedusting chamber, fixing a core tube [7], it is the hollow cylinder of being made by metal or nonmetallic materials, its shape can be straight tube, perhaps frustum, the combination of perhaps straight tube and frustum, porose on the barrel, the shape in hole is not limit, the bore of single hole is 3～50 millimeters, and the percent opening of barrel is 10～80%, and core tube [7] keeps coaxial with pinwheel [3], gap between core tube 7 and the dedusting chamber is with the upper end minimum, be 3～50 millimeters,, be 0.5～1.5 times of elbow diameter in the lower end maximum, the upper port next-door neighbour of core tube [7] is just revolved the chamber lower edge, lower port is coaxial relative with elbow [8], and core tube [7] lower port diameter is more than or equal to the diameter of elbow [8]
(2) core tube [7] is by being fixed on supporting units support on dedusting chamber and/or the elbow, that made by rod member or lath,
(3) in core tube [7], fixing a hollow core hammer [6], it is made up of for three sections top, throat and bottom, top is the sphere or the paraboloid of revolution, throat is a straight cylinder shape, the bottom is the paraboloid of revolution, the axial ratio of core hammer [6] is 1～4, and the maximum gauge of core hammer [6] throat is 0.25～1.5 times of elbow [8] diameter.
2, spiral-flow dust-removing centrifugal machine according to claim 1 is characterized in that, said core tube [7] is inversed taper platform shape, and its tapering is 2～20 degree, and its upper port is connected with the dedusting chamber, and its lower port is connected with housing or elbow [8].
3, spiral-flow dust-removing centrifugal machine according to claim 1, it is characterized in that, said core tube [7] two sections are formed, epimere is a straight tube, hypomere is an inversed taper platform, the percent opening of straight tube of epimere and hypomere frustum is 10～80%, and its upper port is connected with the dedusting chamber, and its lower port is connected with housing or elbow [8].
4, spiral-flow dust-removing centrifugal machine according to claim 1, it is characterized in that, said core tube [7] is made up of for three sections upper, middle and lower, and upper and lower section is inversed taper platform shape, and the stage casing is a straight cylinder, the percent opening of epimere frustum is 10～50%, in, the percent opening of hypomere is 25～80%, the gap between core tube stage casing and the dedusting chamber is 10～300 millimeters, the epimere next-door neighbour of core tube [7] is just revolved the chamber lower edge, hypomere is connected with elbow [8]
According to claim 2,3,4 one of them described spiral-flow dust-removing centrifugal machine, it is characterized in that 5, fix a nozzle [5] between pinwheel [3] and core hammer [6], nozzle is towards pinwheel [3].
6, spiral-flow dust-removing centrifugal machine according to claim 1, it is characterized in that, just revolve have in the chamber one with pinwheel [3] coaxial, hollow helping revolve post [2], its top is cylindric, be fixed on and just revolve the chamber top end face, helping the bottom of revolving post [2] is cone barrel, and motor transmission shaft [12] passes to help and revolves post [2] and be connected with pinwheel [3], power transmission shaft [12] and help between the awl tube that revolves post [2] bottom bearing is arranged.
7, spiral-flow dust-removing centrifugal machine according to claim 5, it is characterized in that, just revolve have in the chamber one with pinwheel [3] coaxial, hollow helping revolve post [2], its top is cylindric, be fixed on and just revolve the chamber top end face, helping the bottom of revolving post [2] is cone barrel, and motor transmission shaft [12] passes to help and revolves post [2] and be connected with pinwheel [3], power transmission shaft [12] and help between the awl tube that revolves post [2] bottom bearing is arranged.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN 98201992 CN2332464Y (en) | 1998-03-16 | 1998-03-16 | Cyclone dust removal centrifuge |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN 98201992 CN2332464Y (en) | 1998-03-16 | 1998-03-16 | Cyclone dust removal centrifuge |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN2332464Y true CN2332464Y (en) | 1999-08-11 |
Family
ID=33959135
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN 98201992 Expired - Fee Related CN2332464Y (en) | 1998-03-16 | 1998-03-16 | Cyclone dust removal centrifuge |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN2332464Y (en) |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| EP2078153B1 (en) * | 2006-10-24 | 2019-05-15 | Davies, David | Induction and fuel delivery system for piston engine |
-
1998
- 1998-03-16 CN CN 98201992 patent/CN2332464Y/en not_active Expired - Fee Related
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| EP2078153B1 (en) * | 2006-10-24 | 2019-05-15 | Davies, David | Induction and fuel delivery system for piston engine |
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| Date | Code | Title | Description |
|---|---|---|---|
| C14 | Grant of patent or utility model | ||
| GR01 | Patent grant | ||
| C19 | Lapse of patent right due to non-payment of the annual fee | ||
| CF01 | Termination of patent right due to non-payment of annual fee |