CN2699245Y - Fluid measuring device - Google Patents
Fluid measuring device Download PDFInfo
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- CN2699245Y CN2699245Y CN 200420005373 CN200420005373U CN2699245Y CN 2699245 Y CN2699245 Y CN 2699245Y CN 200420005373 CN200420005373 CN 200420005373 CN 200420005373 U CN200420005373 U CN 200420005373U CN 2699245 Y CN2699245 Y CN 2699245Y
- Authority
- CN
- China
- Prior art keywords
- main body
- fluid
- pipeline main
- fluid meter
- cover plate
- 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.)
- Expired - Fee Related
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Abstract
The utility model relates to a fluid meter which is composed of a pipeline main body and a cover board together, wherein, the cover board is composed of a printed circuit board, and two pressure sensors are directly arranged on the printed circuit board of the cover board, encapsulated and sealed by soft gum. The two pressure sensors can respectively be used for sensing the pressure head and the pressure difference of the fluid inlet part and the fluid outlet part of the fluid meter; moreover, the printed circuit board forms the cover board, the two pressure sensors are directly arranged on the cover board, and the cover board is fixedly locked on a structure on the outer side of the pipe diameter of the pipeline main body via locking screws, so the structure of the fluid meter is very firm. Thus, the pressure endurance capability, the service life and the precision of the fluid meter can be increased; meanwhile, the incidence rate of faults of the fluid meter can be reduced.
Description
Technical field
The utility model relates to a kind of fluid meter, especially uses the fluid meter of two pressure transducers.
Background technology
The fluid meter 10 of prior art shown in Figure 1, be in its pipeline main body 1) inside, form venturi tube structure, promptly with neck, as shown in the figure, this pipeline main body 1) fluid intake portion 13 forms and shrinks pipeline, and its fluid egress point portion 14, then form the diffusion pipeline, so the junction shrinking pipeline and diffusion pipeline promptly forms the vicissitudinous neck of basal area, make the inside of pipeline main body 11 therefore constitute the structure of Venturi tube.
When the flow through flow of this pipeline main body 11 of fluid is Q, and the sectional area of the fluid intake portion 13 at pipeline main body 11 two ends and fluid egress point portion 14 is respectively A1 and A2, and the average velocity of this place's fluid is when being respectively V1 and V2; According to fluid dynamic Bernoulli's theorem (Bernoullitheorem): the velocity head (V of pipeline
2/ 2g) keeping constant, and according to current stabilization (Steady flow) principle of theorem continuously with the summation of pressure head (P): the fluid mass sum total in the pipeline is certain value, Q
In=A
1V
1=A
2V
2=Q
OutConstant can obtain measuring the relational expression of flow Q:
Q＝CA
2{[2g(P
1-P
2)]/[1-(A
2/A
1)
2]}
1/2 (1)
Wherein, P
1Be the pressure head of fluid intake portion 13, P
2Be the pressure head of fluid egress point portion 14 near neck; And C is the coefficient of flow of Venturi tube, and is different with different Venturi tubes, but can draw through experiment, and its scope is roughly between 0.92-0.99; And A
1Sectional area and A for fluid intake portion 13
2Being the sectional area of fluid egress point portion (14), all is known numerical value.
Therefore, the fundamental purpose of the fluid meter 10 of prior art, i.e. near the pressure reduction (P that neck, is produced in the fluid intake portion 13 of measuring pipeline main body 11 two ends and fluid egress point portion 14
1-P
2) numerical value, utilize micro processor again, with measured pressure reduction (P
1-P
2) numerical value is through according to the operation result of relational expression (1), and convert flow Q and the flow velocity of measuring to, simultaneously, the numerical value of this flow Q and flow velocity can be shown.
And near the pressure reduction (P of fluid meter 10 in order to be produced the neck of measuring pipeline main body 11 inside of prior art
1-P
2), the caliber outside in the pipeline main body 11 of the fluid meter 10 of prior art convexes with a platform 12, and is drilled with out the through hole 15 of a small-bore from the table top of this platform 12, constitutes with the contraction pipeline of the fluid intake portion 13 of this pipeline main body 11 to communicate; In addition, on the table top of this platform 12, other is concaved with a dented space, be used for holding and be provided with a differential pressure pickup 18 inside, and be drilled with out the through hole 16 of a small-bore from the bottom surface of this dented space, constitute with the diffusion pipeline of the fluid egress point portion 14 of this pipeline main body 11 and to communicate, and as far as possible near the neck of these pipeline main body 11 inside.
Simultaneously, in order to make the upper end of differential pressure pickup 18, can sense the pressure head P of the fluid intake portion of transmitting by through hole 15 13
1On the surface of this platform 12, be provided with channel 19 again one, constitute with the upper end of set through hole 15 and differential pressure pickup 18 and to communicate, utilize a cover plate 17 to cover and be enclosed in above the table top of this platform 12 again, make the upper end and the lower end of this differential pressure pickup 18, therefore can sense the pressure head P of the fluid intake portion of transmitting by through hole 15 13
1, and sense the fluid egress point portion transmitted by through hole 16 14 near near the pressure head P the necks
2Thereby, with the pressure reduction (P that measures
1-P
2) numerical value or signal, be sent to that micro processor calculates and measured flow Q and the flow velocity numerical value that comes out is shown.
But, the fluid meter 10 of the prior art has structural defective, and has following three shortcomings at least on using:
One uses single differential pressure pickup 18 to measure near the pressure reduction (P that is produced the neck of pipeline main body 11 inside
1-P
2), so the upper end of this differential pressure pickup 18 and lower end must be born pressure head P simultaneously
1And pressure head P
2Pressure, cause this differential pressure pickup 18 that not firm and illusive structure problem is arranged, pressure head P when fluid intake portion 13
1And fluid egress point portion 14 is near the pressure head P of neck
2, the above pressure reduction (P of certain degree is arranged
1-P
2) when changing, the differential pressure pickup 18 of the fluid meter 10 of prior art, causes serviceable life of fluid meter 10 of prior art shorter, and is not inconsistent economic benefit because can not bear pressure reduction changes and break down through regular meeting.
They are two years old, on the platform 12 of the pipeline main body 11 of the fluid meter 10 of the prior art, because must be provided with the channel 19 of level, just can reach the upper end that makes differential pressure pickup 18, can sense the pressure head P of the fluid intake portion of being transmitted via through hole 15 (13)
1Yet,, this channel 19 and this through hole 15 constitute the path that communicates, and are rectangular paths, and this path structure can make the pressure head P that differential pressure pickup (18) is sensed
1Lose genuine phenomenon, so measured flow Q and the flow rate result of the fluid meter of prior art (10) is inaccurate in fact.
They are three years old, above the platform (12) of the fluid meter of prior art (10), because offer the relation of the channel (19) of horizontal direction, so, must use a cover plate (17) cover and be enclosed in this platform (12) above, but, the pressure head P of the fluid intake portion of transmitting by through hole (15) (13)
1, but be enclosed in adhesion above this platform (12) greater than this cover plate (17) through regular meeting, cause this cover plate (17) can be because can not bear pressure head P
1Pressure, and wreck or break and cause the fluid meter (10) of the prior art not use.
Summary of the invention
Therefore, main utility model purpose of the present utility model, promptly improve at the shortcoming of the fluid meter of prior art, fluid meter is modified to has two pressure transducers, and distinctly be used for the pressure head of fluid intake portion of senses flow fluid meter and the pressure head of fluid egress point portion separately, can accurately measure the fluid intake portion at fluid meter two ends and the pressure reduction that fluid egress point portion is produced near throat, the problem of using single differential pressure pickup to cause with the fluid meter of thorough solution prior art, but and the serviceable life of lifting fluid meter and accuracy.
And another fundamental purpose of the present utility model, be to provide a kind of fluid meter structure of novelty, has the inner pipeline main body that constitutes the Venturi tube structure, and use two pressure transducers, the pressure head of fluid intake portion and the fluid egress point portion that is used for the senses flow fluid meter separately out of the ordinary, so all can bearing large-scale pressure reduction, each pressure transducer changes, especially, these two pressure transducers are to be set directly on the printed circuit board (PCB), and impose flexible glue encapsulation and sealing, and above locking this printed circuit board outside the caliber of pipeline main body with locking screw, except that the enclosure portion that constitutes the pipeline main body, and dress up the fluid meter of tool strong construction with pipeline main body mutual group, by the structure of this special setting pressure transducer, voltage endurance capability that can the adherence pressure sensor, serviceable life and accuracy, simultaneously, the rate of breakdown of fluid meter can be reduced, and the usable range of fluid meter can be promoted.
The secondary objective of the utility model, be to provide a kind of multi-functional fluid meter, on the pipeline main body of fluid meter, other is provided with TDS water-quality test device, when measuring tap water, mountain spring water, mineral water, and during the flow of various packing water, can measuring tap water, mountain spring water, mineral water, and the water quality purity and the water hardness of various packing water in the lump.
Description of drawings
Fig. 1 is to use Ba Erdeng pipe (Bourdon Tube) manometric synoptic diagram.
Fig. 1 is the sectional view and the user mode synoptic diagram thereof of the fluid meter (10) of prior art.
Fig. 2 is the stereographic map of the fluid meter (20) that discloses of the utility model.
Fig. 3 is the spare part exploded view of fluid meter (20) shown in Figure 2.
Fig. 4 is pipeline main body (21) the part section stereographic map of fluid meter (20) shown in Figure 2.
Fig. 5 is that fluid meter (20) shown in Figure 2 uses two pressure transducers (50), and these two pressure transducers (50) are the synoptic diagram that is set directly at above the cover plate (60) that constitutes with printed circuit board (PCB).
Fig. 6 is that cover plate (60) shown in Figure 5 is coated on the inner synoptic diagram of flexible glue (80) with pressure transducer (50) after sticking a slice injecting glue pad (40) and filling flexible glue (80).
Fig. 7 is the sectional view and the user mode synoptic diagram thereof of fluid meter (20) shown in Figure 2.
Fig. 8 is fluid meter (20) second specific embodiments that the utility model discloses, and the end of its pipeline main body (21) is set as the synoptic diagram that one group of rapid-acting coupling (90) can be assembled in junction surface (211).
Fig. 9 is fluid meter (20) the 3rd specific embodiment that the utility model discloses, and on the caliber of its pipeline main body (21), is provided with the stereographic map of TDS water-quality test device (95).
The simple declaration of assembly conventional letter
The fluid meter 11 pipeline main bodys of 10 prior aries
12 platforms, 13 fluid intake portions
14 fluid egress point portions, 15 through holes
16 through holes, 17 cover plates
18 differential pressure pickups, 19 channels
20 fluid meters, 21 pipeline main bodys
22 seat stand 22a, 22b groove
22c location wall 22d screw
24 fluid egress point portions of 23 fluid intake portions
25 through holes, 26 through holes
27 reference columns, 28 bearings
211 junction surfaces, 30 leakproof films
31 bodies, 32 slotted eyes
33 locating slots, 40 injecting glue pads
41 bodies, 42 slotted eyes
43 locating slots, 44 pins
50 pressure transducers, 51 pressure-sensing chips
52 jumper connections, the 53 glass pads that go between
60 cover plates, 61 bodies
62 locking holes, 63 jacks
64 locating slots, 70 locking screws
90 rapid-acting couplings of 80 flexible glues
95 TDS water-quality test devices
Embodiment
Please refer to Fig. 2 to Fig. 7, the fluid meter that the utility model disclosed (20), its essential structure is made of jointly the cover plate (60) that a pipeline main body (21), the plate face that reaches are provided with two pressure transducers (50); But most preferred embodiment of the present utility model is the tellite that directly uses the plate face to be provided with P.e.c. and be provided with these two pressure transducers (50), constitutes the cover plate (60) of this fluid meter (20).
Please refer to Fig. 4, the internal structure of this pipeline main body (21), be to constitute venturi tube structure with throat (A), that is, the fluid intake portion (23) of this pipeline main body (21) is to form to shrink pipeline, and the fluid egress point portion (24) of this pipeline main body (21), be to form the diffusion pipeline, so, promptly form the vicissitudinous throat of basal area (A) in the junction of shrinking pipeline and diffusion pipeline.
Please refer to Fig. 3 and Fig. 4, on the caliber outside of this pipeline main body (21), convex with a seat stand (22), and on the table top of this seat stand (22), be provided with the dented space of coming out to lower recess, but preferred embodiment of the present utility model is that this dented space is separated into two grooves that independently separate (22a) and groove (22b); Wherein, the bottom surface of this groove (22a) is drilled with the through hole (25) of a small-bore, communicates with the contraction pipeline of the fluid intake portion (23) of this pipeline main body (21); And the bottom surface of an other groove (22b) is drilled with out the through hole (26) of a small-bore, communicate with the diffusion pipeline of the fluid egress point portion (24) of this road main body (21) of pipe, but as far as possible near near the throat (A).
And the seat stand (22) in order to make pipeline main body (21), other has the function of location spare part, can strengthen simultaneously the structural strength of this seat stand (22) again, both sides in this seat stand (22) must be provided with the reference column (27) of tool positioning function, perhaps, around the table top of this seat stand (22), be convexly equipped with location wall (22c) again with suitable height, make the inside of this location wall (22c) to can be used to hold a slice leakproof film (30).
The body (31) of this leakproof film (30), be provided with two slotted eyes that independently separate (32), and the position that is shaped, groove (22a) and groove (22b) above corresponding the seat stand (22) that is formed in this pipeline main body (21), after this sheet leakproof film (30) is laid on above the table top of this seat stand (22), can seal the groove (22a) and the gap between the groove (22b) of this seat stand (22) and reach the function of performance leakproof.
Simultaneously, the periphery of this leakproof film (30), correspondence is arranged on the top reference column (27) of seat stand (22) of this pipeline main body (21), also be provided with locating slot (33), in the time of leakproof film (30) will being laid on above the table top of this seat stand (22), can be by the mutual contraposition of the locating slot (33) of leakproof film (30) with the reference column (27) of this seat stand (22), guiding with by the reference column (27) of this seat stand (22) is placed on leakproof film (30) on the tram that can bring into play leak preventing effect and reach.
Please refer to Fig. 3 and Fig. 5, the body (61) of this cover plate (60) is made of tellite, and is provided with P.e.c..Simultaneously, the periphery of the body (61) of this cover plate (60), correspondence is arranged on the top reference column (27) of seat stand (22) of this pipeline main body (21), also be provided with locating slot (64), therefore, can be by the mutual contraposition of the locating slot (64) of this cover plate (60) and the reference column (27) of this seat stand (22) with by the guiding of the reference column (27) of this seat stand (22), can make things convenient for the assembling of cover plate (60) and cover plate (60) correctly is placed on above the seat stand (22) of this pipeline main body (21).
Please refer to Fig. 3 and Fig. 7, on the table top of the seat stand (22) of this pipeline main body (21), be provided with some screws (22d), and body (61) the plate face of this cover plate (60), correspondence is arranged on the top screw (22d) of seat stand (22) of this pipeline main body (21), also is provided with some locking holes (62); When cover plate (60) correctly covers and is enclosed in above the seat stand (22) of this pipeline main body (21), can use locking screw (70) that cover plate (60) and pipeline main body (21) are constituted firm closing component structure, become fluid meter of the present utility model (20) with mutual group, and, locking strength by locking screw (70), can promote the pressure capability of bearing of fluid meter (20), break with preventing cover plate (60) to be subjected to hydrodynamic pressure or destroy, simultaneously, connect locking strength by locking screw (70), really packing is clipped in the leakproof film (30) between the seat stand (22) of cover plate (60) and pipeline main body (21), gives full play to the effect of leakproof to facilitate leakproof film (30).
Please refer to Fig. 3, Fig. 5 and Fig. 6, these two pressure transducers (50) are based on the highly sensitive pressure-sensing chip of tool (51), and by jumper connection lead-in wire (52) and glass pad (53), these two pressure transducers (50) are fixed on above the body (61) of this cover plate (60), and constitute electric connection with the P.e.c. of this cover plate (60), simultaneously, these two pressure transducers (50) are imposed flexible glue (80) encapsulation, make these two pressure transducers (50) be sealed in flexible glue (80) inside, during use, isolate fully and can not touch fluid with fluid, but can see through flexible glue (80) and experience the pressure of fluid and measure the pressure of fluid.
Please refer to Fig. 3 and Fig. 6, the utility model makes pressure transducer (50) be sealed in the inside of flexible glue (80) fully for reaching, one of preferred embodiment of the present utility model, in advance a slice injecting glue pad (40) is attached on the body (61) of this cover plate (60), and utilize the set slotted eye of opening of body (41) (42) of this sheet injecting glue pad (40), these top two pressure transducers (50) of body (61) that will be fixed on this cover plate (60) are contained in pairing slotted eye (42) inside, flexible glue (80) is packed in the slotted eye (42) of this injecting glue pad (40) again, makes pressure transducer (50) be sealed in the inside of flexible glue (80) fully.
Please refer to Fig. 3, Fig. 6 and Fig. 7, the periphery of the body (41) of this injecting glue pad (40), correspondence is arranged on the top reference column (27) of seat stand (22) of this pipeline main body (21), also be provided with locating slot (43), therefore, after the body (61) that this injecting glue pad (40) is attached on this cover plate (60) is gone up, can be by the mutual contraposition of locating slot (43) with the reference column (27) of this seat stand (22) of the locating slot (64) of this cover plate (60) and this injecting glue pad (40), with guiding by the reference column (27) of this seat stand (22), can conveniently cover plate (60) and injecting glue pad (40) correctly be placed on above the seat stand (22) of this pipeline main body (21), make and to fit tightly between injecting glue pad (40) and the leakproof film (30), when cover plate (60) was integral with pipeline main body (21) locking, injecting glue pad (40) and leakproof film (30) can be given full play to the effect of leakproof.
For convenience of injecting glue pad (40) being sticked and being fixed on the correct position of this cover plate (60), above the body (61) of this cover plate (60), be provided with positioning jack (63), then be provided with pin (44) above the body (41) of this injecting glue pad (40), and position to should cover plate (60) set positioning jack (63), behind the applied upward bonding agent of the body (41) of injecting glue pad (40), after the pin (44) of injecting glue pad (40) directly inserted positioning jack (63) inside of this cover plate (60), just reach and stick and the fixing purpose of injecting glue pad (40).
According to noted earlier, when cover plate (60) and pipeline main body (21) mutual group are dressed up fluid meter of the present utility model (20), please refer to Fig. 7, be fixed on two pressure transducers (50) on this cover plate (60), lay respectively at the groove (22a) of seat stand (22) of this pipeline main body (21) and the top of groove (22b), and use flexible glue (80) sealing.Therefore, each pressure transducer (50) all is that single face bears pressure, and can not come in contact with fluid, changes so can bear large-scale pressure reduction.
And the employed cover plate of the utility model (60) is to constitute the printed circuit board (PCB) that electrically connects with pressure transducer (50), therefore, can reduce the measuring-signal loss or the distortion of pressure transducer (50), can improve the accuracy of fluid meter (20).
Please refer to Fig. 7, the fluid meter shown in the utility model (20) is two pressure transducers (50) that utilize this cover plate (60) set, respectively the pressure head P of the fluid intake portion (23) transmitted by the through hole (25) of pipeline main body (21) of sensing
1, and the fluid egress point portion of being transmitted by the through hole (26) of pipeline main body (21) (24) is near the pressure head P of throat (A)
2, and with measured pressure head P1 and pressure head P
2Signal is sent to micro processor and calculates pressure reduction (P via cover plate (60)
1-P
2) the result and the calculation convert flow Q and the flow velocity of measuring to, with flow Q and the flow velocity measured, show again with numerical value.
Please refer to Fig. 8, fluid meter provided by the utility model (20), in an end or the two ends of pipeline main body (21), must be set as the junction surface (211) that can assemble one group of rapid-acting coupling (90), make fluid meter (20) have the function of quick joint pipeline again; Perhaps, must be with the junction surface (211) of this pipeline main body (21), be set as junction surface (211) (not shown) that inside diameter surface has internal thread, perhaps, external diameter surface has externally threaded junction surface (211) (not shown), makes fluid meter (20) to screw togather with other pipeline and is connected.
Please refer to Fig. 9, the fluid meter that the utility model disclosed (20), on the caliber outside of this pipeline main body (21), can be convexly equipped with one (28) again, and in this bearing (28) TDS (Total Dissolved Solids) water-quality test device (95) can be set, but contained pollutant in the test water, impurity, and the total solid TDS of unknown chemical material make the fluid meter that the utility model disclosed (20) have the function of measuring water hardness and water quality purity concurrently.
When this fluid meter (20) that the utility model disclosed, be used for measuring tap water, mountain spring water, mineral water, and during the flow of various packing water, can measure tap water, mountain spring water, mineral water, and the water hardness and the water quality purity of various packing water simultaneously.
Claims (11)
1. fluid meter, the cover plate that is provided with two pressure transducers by a pipeline main body and a plate face is formed jointly, wherein, the inside of this pipeline main body constitutes venturi tube structure, has the fluid egress point portion that is set as the fluid intake portion of shrinking pipeline and is set as the diffusion pipeline, and the caliber of this pipeline main body convexes with a seat stand on the outside, the table top of this seat stand also is provided with two grooves that separate, respectively be provided with a through hole with the bottom surface of each groove, communicate with the contraction pipeline and the diffusion pipeline of this pipeline main body respectively; This cover plate is to cover on the seat stand of this pipeline main body, and constitutes the capping of this seat stand, and each pressure transducer that is arranged on this cover plate sealed fully by silica gel, and lays respectively at the top of the through hole of pairing pipeline main body.
2. fluid meter as claimed in claim 1, wherein, the bottom surface of this cover plate is provided with a slice injecting glue pad, and to be arranged on two pressure transducers on this cover plate be distinctly to be contained in two slotted eyes that separate that this injecting glue pad offered and in each slotted eye and be packed into silica gel.
3. fluid meter as claimed in claim 1 or 2 wherein, is provided with the location wall around the table top of this seat stand, and is provided with a slice leakproof film in the inside of location wall.
4. fluid meter as claimed in claim 3, wherein, the plate face of this cover plate is provided with jack, and this injecting glue pad is provided with pin that should jack, and this pin is embedded in this jack.
5. fluid meter as claimed in claim 1 or 2, wherein, the table top of this seat stand is provided with reference column.
6. as claim 1,2 or 4 described fluid meters, wherein, this cover plate is a printed circuit board (PCB).
7. fluid meter as claimed in claim 3, wherein, this cover plate is a printed circuit board (PCB).
8. as claim 1,2,4 or 7 described fluid meters, wherein, the caliber end of this pipeline main body is set as the junction surface that can assemble rapid-acting coupling.
9. fluid meter as claimed in claim 6, wherein, the caliber end of this pipeline main body is set as the junction surface that can assemble rapid-acting coupling.
10. as claim 1,2,7 or 9 described fluid meters, wherein, the caliber of this pipeline main body is provided with TDS water-quality test device.
11. fluid meter as claimed in claim 8, wherein, the caliber of this pipeline main body is provided with TDS water-quality test device.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN 200420005373 CN2699245Y (en) | 2004-03-19 | 2004-03-19 | Fluid measuring device |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN 200420005373 CN2699245Y (en) | 2004-03-19 | 2004-03-19 | Fluid measuring device |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN2699245Y true CN2699245Y (en) | 2005-05-11 |
Family
ID=34767527
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN 200420005373 Expired - Fee Related CN2699245Y (en) | 2004-03-19 | 2004-03-19 | Fluid measuring device |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN2699245Y (en) |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102856495A (en) * | 2011-06-30 | 2013-01-02 | 清华大学 | Pressure regulating and controlling thin film transistor and application thereof |
-
2004
- 2004-03-19 CN CN 200420005373 patent/CN2699245Y/en not_active Expired - Fee Related
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102856495A (en) * | 2011-06-30 | 2013-01-02 | 清华大学 | Pressure regulating and controlling thin film transistor and application thereof |
| CN102856495B (en) * | 2011-06-30 | 2014-12-31 | 清华大学 | Pressure regulating and controlling thin film transistor and application thereof |
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Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| C14 | Grant of patent or utility model | ||
| GR01 | Patent grant | ||
| C17 | Cessation of patent right | ||
| CF01 | Termination of patent right due to non-payment of annual fee |
Granted publication date: 20050511 |