CN201111578Y - Spring self-restoring decompression device - Google Patents
Spring self-restoring decompression device Download PDFInfo
- Publication number
- CN201111578Y CN201111578Y CNU2007201821010U CN200720182101U CN201111578Y CN 201111578 Y CN201111578 Y CN 201111578Y CN U2007201821010 U CNU2007201821010 U CN U2007201821010U CN 200720182101 U CN200720182101 U CN 200720182101U CN 201111578 Y CN201111578 Y CN 201111578Y
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- Prior art keywords
- pressure relief
- spring
- sealing gland
- pressure
- truncated cone
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- Expired - Lifetime
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Abstract
The utility model relates to a spring self-resetting pressure relieving device, comprising a sealing pressing cover which is hermetically covered on a pressure relieving port. The upper part of the sealing pressing cover is provided with a pressing cover; one end of a truncated cone scroll spiral spring supports the pressing cover and the other end thereof supports the sealing pressing cover; furthermore, the pressure relieving port is provided with a guiding column; one end of the guiding column is fixedly arranged beside the pressure relieving port and the other end thereof is connected with the pressing cover; the sealing pressing cover can be connected with the guiding column in a sliding way. The structure of the spring self-resetting pressure relieving device has automatically complete pressure-relieving; furthermore, the sealing pressing cover after the pressure-relieving can be automatically resetted, the equipment is not required to be checked and maintained, and the production efficiency is improved; the spring self-resetting pressure relieving device can be suitable for complex pressure pipelines, in particular to the pressure resistance dust removal equipment such as blast furnace coal gas or a converter, etc.; the spring self-resetting pressure relieving device can stably act under large load, and can be suitable for the pressure resistance dust removal equipment such as blast furnace coal gas or the converter with pressure resistance strength of more than 0.3MPa, etc.
Description
Technical field
The utility model relates to the pressure relief device that resets certainly in a kind of pressure facility, and when especially a kind of pressure in pressurized container surpassed specified value, the spring that described pressurized container is carried out safety relief was from resetting pressure relief device.
Background technique
At present, the safe pressure relief device in the known industrial pressure vessel, particularly dedusting of blast furnace gas normally adopts straight-through type or gravity type venting of dust explosion (pressure) device.Fig. 1 is a kind of cross-sectional schematic of known straight-through type explosion venting device.As shown in the drawing, this straight-through type explosion venting device adopts the structure of pressure release diaphragm, promptly going up the pressure release diaphragm 101 that installation is made by materials such as stainless steel or polytetrafluoroethylenes with the venting of dust explosion mouth 11 ' that pressed gas directly contacts, when container inner pressure surpasses setting value, pressure release diaphragm 101 will break automatically, makes pressure release diaphragm 101 to container outside the pressure release of pressure by breaking that surpasses setting value in the container.Described straight-through type explosion venting device simple in structure, but owing to be Bullet structure, once after pressure release takes place, can't repair automatically, the pressure release diaphragm that needs to break is removed, and changes the complete pressure release diaphragm 101 of a slice again.And, find the accurate position that pressure release takes place for the pressure piping of complexity, and need the more time of cost, will cause that harmful gas escapes in the pipeline, jeopardize people's safety.
Fig. 2 is another kind of known heavy hammer type gland explosion venting device, and is as shown in the drawing, and this device is to have increased the heavy hammer type gland on the basis of above-mentioned straight-through type explosion venting device.As shown in Figure 2, with venting of dust explosion mouth 11 ' that pressed gas directly contacts on heavy hammer type gland 201 has been installed, one end of this heavy hammer type gland 201 is connected by pivot 202 with container wall 11 ', and the other end is realized sealing with the deadweight of the bead on the container wall 11 ' 211 by the heavy hammer type gland by the sealing gasket 212 that is fixed on the heavy hammer type gland 201.When manifold pressure surpassed the weight of heavy hammer type gland 201, manifold pressure backed down pressure release with this heavy hammer type gland 201, after pressure release, by the deadweight generation weight effect of heavy hammer type gland 201, closed venting of dust explosion mouth 11 ', finished the pressure release action.Its poor sealing performance of such pressure relief device, the deadweight of heavy hammer type gland is limited again, and therefore, the application is limited.
The design people is based on the research and development for many years to the pressurized container pressure relief device, at the problem that exists in the above known technology, still can proper functioning after pressure release for the assurance system, and reduce escaping of harmful gas, spring of the present utility model is proposed from resetting pressure relief device.
The model utility content
For solving the problems of the technologies described above, the utility model provides a kind of and is installed on the container wall (pipeline) that directly contacts with pressed gas, realizes from the spring that resets from resetting pressure relief device by truncated cone scrollwork helical spring.Described spring when container inner pressure surpasses setting value, can be opened pressure release outside container from the sealing gland of the pressure relief device that resets automatically; When container inner pressure drops to the force value of setting when following after pressure release, can automatically reset is closed together in the pressure relief opening of container, makes system continue operation under normal state.
For this reason, a kind of spring that the utility model proposes is from resetting pressure relief device, wherein, described spring has the sealing gland that is closed together in pressure relief opening from the pressure relief device that resets, the top of described sealing gland is provided with and compresses cover, the helical spring end of truncated cone scrollwork is resisted against the described cover that compresses, and the other end is resisted against described sealing gland; And described pressure relief opening place is provided with directional post, and an end of described directional post is fixedly installed on described pressure relief opening place, and the other end connects the described cover that compresses, and described sealing gland can be connected with described directional post slidably.
Aforesaid spring is from the pressure relief device that resets, and wherein, described truncated cone scrollwork helical spring is arranged on the position of centre of gravity of described sealing gland, and at described truncated cone scrollwork helical spring and describedly compress that to be provided with truncated cone scrollwork helical spring between the cover guide locating device provided.
Aforesaid spring is from resetting pressure relief device, and wherein, the helical spring larger diameter end of described truncated cone scrollwork is resisted against described sealing gland, and smaller diameter end is resisted against the described cover that compresses; Be respectively equipped with corresponding boss and ring-type depression on the upper surface of described lower surface that compresses cover and described sealing gland, and described boss and ring-type depression match with the internal diameter or the external diameter at the helical spring two end part of described truncated cone scrollwork respectively.
Aforesaid spring is from resetting pressure relief device, wherein, described pressure relief opening periphery is fixed with the pressure release bearing, described pressure release bearing is provided with the through hole of diameter less than described sealing gland diameter, upper surface at described pressure release bearing is provided with at least one ring seal ring, and the bottom of described sealing gland is covered on described seal ring.
Aforesaid spring is from resetting pressure relief device, and wherein, described directional post has at least two, and an end of described directional post is fixedlyed connected with described pressure release bearing, and the other end is connected the described cover that compresses by gland nut with described directional post.
Aforesaid spring is from resetting pressure relief device, and wherein, the both sides of described sealing gland are provided with at least two guiding engaging lugs, and described directional post passes described guiding engaging lug respectively.
Aforesaid spring is from the pressure relief device that resets, and wherein, the described cover that compresses is made of a channel-section steel, and itself and described truncated cone scrollwork helical spring connect the width of face more than or equal to described spring diameter.
Aforesaid spring is from resetting pressure relief device, and wherein, the described cover that compresses is the cylinder of diameter more than or equal to described sealing gland diameter.
Characteristics and advantage that the utility model is compared with known technology are:
The utility model is by being arranged on sealing gland and compressing truncated cone scrollwork helical spring between the cover, be fixed on the directional post of pressure relief opening and sealing gland can be slided along directional post, thereby when making pressure relief device of the present utility model can work as the value that container inner pressure surpass to set, sealing gland promotes truncated cone scrollwork helical spring makes it produce distortion, then sealing gland leaves pressure relief opening under the promotion of container inner pressure, beginning pressure release outside container.When container inner pressure drops to the force value of setting when following after pressure release,, promote sealing gland immediately and be back to seal ring on the pressure relief opening tightly owing to the deformation-energy that distortion stores by means of truncated cone scrollwork helical spring, make container maintenance sealing state.Structure of the present utility model can be finished pressure release automatically, and sealing gland can automatically reset after the pressure release, so need not equipment is checked, keeped in repair after producing pressure release, has improved manufacturing efficiency.The utility model is applicable to complicated pressure piping, is specially adapted to withstand voltage dusting apparatuss such as dedusting of blast furnace gas or converter, and a large amount of toxic gases is escaped, and has guaranteed the Security of producing, and has overcome the defective that known technology exists.In addition,, can under the situation of big load, move stably, make withstand voltage dusting apparatuss such as its blast furnace gas that can be applicable to that compressive strength 0.3MPa is above or coal gas of converter because the utility model has adopted truncated cone scrollwork helical spring.
Description of drawings
The following drawings only is intended to the utility model done and schematically illustrates and explain, does not limit scope of the present utility model.Wherein,
Fig. 1 is a kind of cross-sectional schematic of known straight-through type explosion venting device;
Fig. 2 is another kind of known heavy hammer type gland explosion venting device structural representation;
Fig. 3 is the full section schematic representation of spring of the present utility model from the pressure relief device plan view that resets;
Fig. 4 is the schematic top plan view of spring of the present utility model from the pressure relief device that resets;
Fig. 5 is the schematic top plan view of spring of the present utility model from another embodiment of pressure relief device that resets.
The drawing reference numeral explanation
1, pressure release bearing 2, seal ring 3, directional post
4, sealing gland 5, sealing gland guide lugs 6, truncated cone scrollwork helical spring
7,7 ' compress cover 8, boss 9, pilot hole
10, gland nut 11, pressure relief opening 12, through hole
13, ring-type depression
Embodiment
Understand for technical characteristics of the present utility model, purpose and effect being had more clearly, now contrast description of drawings embodiment of the present utility model.Wherein, identical parts adopt identical label.
Mode of execution 1 as shown in Figure 3, a kind of spring that the utility model proposes is from resetting pressure relief device, has the sealing gland 4 that is closed together in pressure relief opening 11, the top of described sealing gland 4 is provided with one and compresses cover 7, one end of truncated cone scrollwork spiral shell spring 6 is resisted against the described cover 7 that compresses, and the other end is resisted against described sealing gland 4.Described pressure relief opening 11 peripheries are provided with directional post 3, and an end of described directional post 3 is fixedly installed on described pressure relief opening 11 places, and the other end connects the described cover 7 that compresses, and described sealing gland 4 can be connected with described directional post 3 slidably.In order to make spring of the present utility model being connected firmly from reset pressure relief device and pressure relief opening 11, preferably fixedly install a pressure release bearing 1 in described pressure relief opening 11 peripheries, described pressure release bearing 1 is provided with the through hole 12 of diameter less than described sealing gland 4 diameters, the upper surface of described pressure release bearing 1 is provided with at least one ring seal ring 2, and the bottom of described sealing gland 4 is covered on described seal ring 2.In the embodiment as shown in Figure 3, described seal ring 2 is one to be embedded in the smooth rubber seal of described pressure release bearing 1 upper surface, and the bottom of described sealing gland 4 is resisted against described seal ring 2, seals described pressure relief opening 11.In addition, described seal ring 2 also can be selected other known shape for use, covers pressure relief opening 11 as long as matched with sealing circle 2 in the bottom of sealing gland 4 to constitute sealing.
Preferably, described truncated cone scrollwork helical spring 6 is arranged on the position of centre of gravity of described sealing gland 4, and at truncated cone scrollwork helical spring 6 and compress be provided with between the cover 7 guide locating device provided.
In the present embodiment, the larger diameter end of described truncated cone scrollwork helical spring 6 is resisted against described sealing gland 4, and smaller diameter end is resisted against and compresses cover 7.Described guide locating device provided for being arranged on the described lower surface of cover 7, the boss 8 that protrudes of compressing downwards, and be arranged on ring-type depression 13 on the upper surface of sealing gland 4, and described boss 8 and ring-type depression 13 are oppositely arranged, figure 3 illustrates a kind of mounting type, promptly, the head of described boss 8 is embedded in the smaller diameter end of truncated cone scrollwork helical spring 6, and the head outer circumference diameter of boss 8 matches with the internal diameter of the smaller diameter end of described spring; Interior all diameters of described ring-type depression 13 match with the external diameter of the larger diameter end of truncated cone scrollwork helical spring 6, thereby constitute the helical spring location of truncated cone scrollwork.The orientation type of described truncated cone scrollwork helical spring 6 is not limited to this, also can change the position that is provided with of described boss 8 and ring-type depression 13, the outer circumference diameter of boss 8 heads is matched with the internal diameter of the larger diameter end of truncated cone scrollwork helical spring 6, and interior all diameters of ring-type depression 13 match with the external diameter of the smaller diameter end of truncated cone scrollwork helical spring 6.
In the present embodiment, as shown in Figure 4, the described cover 7 that compresses is made of a channel-section steel, and itself and described truncated cone scrollwork helical spring 6 connect the width B of face more than or equal to the diameter of truncated cone scrollwork helical spring 6.On described pressure release bearing 1, fixedly install two described directional posts 3, be provided with two guiding engaging lugs 5 in the both sides of described sealing gland 4, pass described two guiding engaging lugs 5 respectively by two directional posts 3, described sealing gland 4 is connected with directional post 3 slidably, thereby guaranteed that sealing gland 4 moves steadily, accurately in the open and close process, after finishing pressure release, when the described pressure relief opening 11 of closure, the outer periphery of described sealing gland 4 can correctly cover on seal ring 2.The other end of described directional post 3 passes and is arranged on the described pilot hole 9 that compresses cover 7 both sides, will be described be compressed by gland nut 10 and covers 7 and be connected with described directional post 3.Make and compress cover 7 and compress sealing gland 4 by regulating described gland nut 10, and, regulate, control the elastic force of truncated cone scrollwork helical spring 6 according to the working pressure value in the container by truncated cone scrollwork helical spring 6.
Working principle of the present utility model is: when system normally moved, spring of the present utility model sealed from the pressure relief device that resets and does not leak.And when the working pressure of gas in the container (as coal gas) during greater than setting pressure, the rigidity of for example described truncated cone scrollwork helical spring 6 is pressed aero operating pressure 3000-3500Pa design in the container, then when working pressure in the container during greater than 3500Pa, act on positive pressure on the sealing gland 4 when surpassing the rigidity of truncated cone scrollwork helical spring 6, truncated cone scrollwork helical spring 6 just produces distortion, destroyed the sealing between sealing gland 4 and the seal ring 2, in container under the effect of gas pressure, by the jack-up that makes progress, spring is from the through hole 12 beginning pressure releases of pressure relief device by the pressure release bearing 1 that is communicated with pressure relief opening 11 that reset along directional post 3 for described sealing gland 4.
When aero operating pressure pressure release in the container drops to 3500Pa when following, elastic force by means of truncated cone scrollwork helical spring 6 makes sealing gland 4 move down along directional post 3, sealing state between the bottom of sealing gland 4 and the seal ring 2 recovers, through hole 12 is closed, and the spring pressure relief device that automatically resets is returned to sealing state.
Mode of execution 2
As shown in Figure 5, in the present embodiment, the described cover 7 ' that compresses is the cylinder of diameter more than or equal to sealing gland 4 diameters.Adopt this to compress cover, described sealing gland 4 can be covered on and compress in the cover, thereby truncated cone scrollwork helical spring 6 and seal ring 2 are played the dust-break effect.
Simultaneously, for make described compress cover and the motion of sealing gland 4 more steady, can three or four directional posts 3 be set circumferentially.The quantity of directional post 3 is not limited thereto.
Other structures, working principle and the beneficial effect of present embodiment is identical with mode of execution 1, does not repeat them here.
Only the above person only is the schematic embodiment of the utility model, can not limit the scope that the utility model is implemented with it.So the amplification of its equivalent assemblies is dwindled, displacement, or, all still belong to the covering scope of the utility model claims according to equivalent variations and modification that the utility model scope of patent protection is done.
Claims (8)
1, a kind of spring is from resetting pressure relief device, it is characterized in that: described spring has the sealing gland that is closed together in pressure relief opening from the pressure relief device that resets, the top of described sealing gland is provided with and compresses cover, the helical spring end of truncated cone scrollwork is resisted against the described cover that compresses, and the other end is resisted against described sealing gland; And described pressure relief opening place is provided with directional post, and an end of described directional post is fixedly installed on described pressure relief opening place, and the other end connects the described cover that compresses, and described sealing gland can be connected with described directional post slidably.
2, spring as claimed in claim 1 is from resetting pressure relief device, it is characterized in that: described truncated cone scrollwork helical spring is arranged on the position of centre of gravity of described sealing gland, and at described truncated cone scrollwork helical spring and describedly compress that to be provided with truncated cone scrollwork helical spring between the cover guide locating device provided.
3, spring as claimed in claim 2 is from resetting pressure relief device, and it is characterized in that: the helical spring larger diameter end of described truncated cone scrollwork is resisted against described sealing gland, and smaller diameter end is resisted against the described cover that compresses; Be respectively equipped with corresponding boss and ring-type depression on the upper surface of described lower surface that compresses cover and described sealing gland, and described boss and ring-type depression match with the internal diameter or the external diameter at the helical spring two end part of described truncated cone scrollwork respectively.
4, spring as claimed in claim 1 is from resetting pressure relief device, it is characterized in that: described pressure relief opening periphery is fixed with the pressure release bearing, described pressure release bearing is provided with the through hole of diameter less than described sealing gland diameter, upper surface at described pressure release bearing is provided with at least one ring seal ring, and the bottom of described sealing gland is covered on described seal ring.
5, spring as claimed in claim 1 is from resetting pressure relief device, it is characterized in that: described directional post has at least two, one end of described directional post is fixedlyed connected with described pressure release bearing, and the other end is connected the described cover that compresses by gland nut with described directional post.
6, as claim 1 or 4 described springs from resetting pressure relief device, it is characterized in that: the both sides of described sealing gland are provided with at least two guiding engaging lugs, and described directional post passes described guiding engaging lug respectively.
7, spring as claimed in claim 1 is from the pressure relief device that resets, and it is characterized in that: the described cover that compresses is made of a channel-section steel, and itself and described truncated cone scrollwork helical spring connect the width of face more than or equal to described spring diameter.
8, spring as claimed in claim 1 is characterized in that from resetting pressure relief device: the described cover that compresses is the cylinder of diameter more than or equal to described sealing gland diameter.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CNU2007201821010U CN201111578Y (en) | 2007-10-26 | 2007-10-26 | Spring self-restoring decompression device |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CNU2007201821010U CN201111578Y (en) | 2007-10-26 | 2007-10-26 | Spring self-restoring decompression device |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN201111578Y true CN201111578Y (en) | 2008-09-10 |
Family
ID=39963321
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CNU2007201821010U Expired - Lifetime CN201111578Y (en) | 2007-10-26 | 2007-10-26 | Spring self-restoring decompression device |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN201111578Y (en) |
Cited By (11)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102357974A (en) * | 2011-09-28 | 2012-02-22 | 无锡锦和科技有限公司 | Self-sealing large-flow exhaust tank |
| CN102616505A (en) * | 2012-03-21 | 2012-08-01 | 中冶南方工程技术有限公司 | Automatic diffusing system for converter gas chamber |
| CN102837916A (en) * | 2012-08-13 | 2012-12-26 | 安徽省金裕皖生物科技开发有限公司 | Stainless steel liquor tank respiratory recovery device |
| CN103244721A (en) * | 2013-05-09 | 2013-08-14 | 三一汽车制造有限公司 | Powder tank safety valve, powder tank and stirring station |
| CN103511692A (en) * | 2012-06-26 | 2014-01-15 | 江苏海陵机械有限公司 | Pipeline pressure-relief device |
| CN103553296A (en) * | 2013-11-08 | 2014-02-05 | 蚌埠玻璃工业设计研究院 | Elastic furnace pressure adjustment device |
| CN104180034A (en) * | 2014-08-27 | 2014-12-03 | 四川省建筑科学研究院 | Automatic control valve for water buoyancy of underground construction |
| CN107951382A (en) * | 2018-01-12 | 2018-04-24 | 湖南唐米力智能科技有限公司 | Automatic dish cooking machine |
| CN108041994A (en) * | 2018-01-12 | 2018-05-18 | 湖南唐米力智能科技有限公司 | Flexible sealing structure |
| CN109373039A (en) * | 2018-12-22 | 2019-02-22 | 福州大学 | A kind of mine working air door relief valve and its working method |
| CN109578643A (en) * | 2018-12-17 | 2019-04-05 | 广州市致顺科技有限公司 | A kind of gas gathering mask with venting of dust explosion function |
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2007
- 2007-10-26 CN CNU2007201821010U patent/CN201111578Y/en not_active Expired - Lifetime
Cited By (16)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102357974B (en) * | 2011-09-28 | 2016-02-03 | 无锡锦和科技有限公司 | Self-sealing high flux exhaust tank |
| CN102357974A (en) * | 2011-09-28 | 2012-02-22 | 无锡锦和科技有限公司 | Self-sealing large-flow exhaust tank |
| CN102616505A (en) * | 2012-03-21 | 2012-08-01 | 中冶南方工程技术有限公司 | Automatic diffusing system for converter gas chamber |
| CN103511692A (en) * | 2012-06-26 | 2014-01-15 | 江苏海陵机械有限公司 | Pipeline pressure-relief device |
| CN102837916A (en) * | 2012-08-13 | 2012-12-26 | 安徽省金裕皖生物科技开发有限公司 | Stainless steel liquor tank respiratory recovery device |
| CN103244721B (en) * | 2013-05-09 | 2016-05-25 | 三一汽车制造有限公司 | Powder material tank safety valve, powder material tank and mixing plant |
| CN103244721A (en) * | 2013-05-09 | 2013-08-14 | 三一汽车制造有限公司 | Powder tank safety valve, powder tank and stirring station |
| CN103553296A (en) * | 2013-11-08 | 2014-02-05 | 蚌埠玻璃工业设计研究院 | Elastic furnace pressure adjustment device |
| CN103553296B (en) * | 2013-11-08 | 2016-07-13 | 蚌埠玻璃工业设计研究院 | A kind of Elastic furnace pressure adjustment device |
| CN104180034A (en) * | 2014-08-27 | 2014-12-03 | 四川省建筑科学研究院 | Automatic control valve for water buoyancy of underground construction |
| CN107951382A (en) * | 2018-01-12 | 2018-04-24 | 湖南唐米力智能科技有限公司 | Automatic dish cooking machine |
| CN108041994A (en) * | 2018-01-12 | 2018-05-18 | 湖南唐米力智能科技有限公司 | Flexible sealing structure |
| CN108041994B (en) * | 2018-01-12 | 2023-10-24 | 湖南唐米力科技有限公司 | Telescopic sealing structure |
| CN109578643A (en) * | 2018-12-17 | 2019-04-05 | 广州市致顺科技有限公司 | A kind of gas gathering mask with venting of dust explosion function |
| CN109578643B (en) * | 2018-12-17 | 2024-03-19 | 广东致顺化工环保设备有限公司 | Gas collecting hood with explosion venting function |
| CN109373039A (en) * | 2018-12-22 | 2019-02-22 | 福州大学 | A kind of mine working air door relief valve and its working method |
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Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| C14 | Grant of patent or utility model | ||
| GR01 | Patent grant | ||
| C41 | Transfer of patent application or patent right or utility model | ||
| TR01 | Transfer of patent right |
Effective date of registration: 20081219 Address after: Wujiang City, Jiangsu province Lingzhen split eight community, zip code: 215222 Patentee after: Kelin Environmental Protection Equipment, Inc. Address before: Wujiang City, Jiangsu province Lingzhen split eight community, zip code: 215222 Patentee before: Jiangsu Kelin Group Co., Ltd. |
|
| ASS | Succession or assignment of patent right |
Owner name: KELIN ENVIRONMENT PROTECTION EQUIPMENTS CO., LTD. Free format text: FORMER OWNER: JIANGSU KELIN GROUP CO., LTD. Effective date: 20081219 |
|
| C41 | Transfer of patent application or patent right or utility model | ||
| TR01 | Transfer of patent right |
Effective date of registration: 20160819 Address after: Split eight communities in Wujiang District of Suzhou City, Jiangsu province 215000 Patentee after: Environmental Protection Technology Co., Ltd. Address before: 215222 Wujiang City, Jiangsu Province eight song split community Patentee before: Kelin Environmental Protection Equipment, Inc. |
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| CX01 | Expiry of patent term | ||
| CX01 | Expiry of patent term |
Granted publication date: 20080910 |