CN207354044U - Frequency converter and aerator - Google Patents
Frequency converter and aerator Download PDFInfo
- Publication number
- CN207354044U CN207354044U CN201721371810.3U CN201721371810U CN207354044U CN 207354044 U CN207354044 U CN 207354044U CN 201721371810 U CN201721371810 U CN 201721371810U CN 207354044 U CN207354044 U CN 207354044U
- Authority
- CN
- China
- Prior art keywords
- end cover
- bottom end
- frequency converter
- annular groove
- water
- 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
Links
- 238000005276 aerator Methods 0.000 title claims abstract description 16
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 claims abstract description 79
- 238000007789 sealing Methods 0.000 claims abstract description 22
- 238000012544 monitoring process Methods 0.000 claims description 8
- 230000017525 heat dissipation Effects 0.000 claims description 3
- 238000005273 aeration Methods 0.000 abstract description 2
- 238000009360 aquaculture Methods 0.000 abstract description 2
- 244000144974 aquaculture Species 0.000 abstract description 2
- 230000004888 barrier function Effects 0.000 description 8
- 230000000694 effects Effects 0.000 description 5
- 230000009286 beneficial effect Effects 0.000 description 3
- 238000005516 engineering process Methods 0.000 description 3
- 238000006243 chemical reaction Methods 0.000 description 2
- 238000010586 diagram Methods 0.000 description 2
- 238000001816 cooling Methods 0.000 description 1
- 238000007654 immersion Methods 0.000 description 1
- 238000012986 modification Methods 0.000 description 1
- 230000004048 modification Effects 0.000 description 1
- 230000001681 protective effect Effects 0.000 description 1
- 238000006467 substitution reaction Methods 0.000 description 1
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- Casings For Electric Apparatus (AREA)
Abstract
The utility model provides a kind of frequency converter and aerator, it is related to the technical field of aquaculture aeration equipment, the frequency converter includes transducer body, upper end cover and bottom end cover, and upper end cover is fixedly connected with bottom end cover, encloses the accommodating chamber being set as installing transducer body；The one end for being used to be connected with bottom end cover on upper end cover is provided with first annular boss, and the one end for being used to be connected with upper end cover on bottom end cover is provided with first annular groove, and first annular boss can be caught in first annular groove；Second annular groove is additionally provided with bottom end cover, the outside diameter of second annular groove is less than the internal diameter of first annular groove；One sealing ring is arranged in second annular groove, and the upper surface of sealing ring is closely abutted with the lower face of upper end cover.The aerator is provided with above-mentioned frequency converter.The frequency converter and aerator, which alleviate frequency converter in the prior art, does not have waterproof measure, in use, there is the technical problem of water inlet risk in environment of paddling.
Description
Technical field
Technical field of aquaculture aeration equipment is the utility model is related to, more particularly, to a kind of frequency converter and aerator.
Background technology
In recent years, as the continuous progress of science and technology, the development of converter technology are also increasingly perfect.Although frequency converter skill
The development of art should not be underestimated, but its shortcoming also can not be ignored：Frequency converter of the prior art is not provided with waterproof measure, is relating to
In use, there is the risk of water inlet in water environment, and the inside of frequency converter can not only influence frequency converter in itself just once intaking
Often work, it is also possible to which there are security risk.Such as：The frequency converter of aerator, since aerator is to work in water, and frequency conversion
Device is not provided with waterproof measure again, so being likely to inside frequency converter into water.
It would therefore be highly desirable to designing a kind of new frequency converter also alleviates above-mentioned technical problem.
Utility model content
First purpose of the utility model is to provide a kind of frequency converter, to alleviate frequency converter existing in the prior art
Waterproof measure is not provided with, in use, there is the technical problem of water inlet risk in environment of paddling.
Frequency converter provided by the utility model, including transducer body, upper end cover and bottom end cover, the upper end cover with it is described
Bottom end cover is fixedly connected, and encloses the accommodating chamber being set as installing the transducer body；
It is used for one end for being connected with the bottom end cover on the upper end cover and is provided with first annular boss, on the bottom end cover
One end for being connected with the upper end cover is provided with first annular groove, and the first annular boss can be caught in described first
In annular groove；
Second annular groove is additionally provided with the bottom end cover, the outside diameter of the second annular groove is less than first ring
The internal diameter of connected in star；One sealing ring is arranged in the second annular groove, and the upper surface of the sealing ring and the upper end
The lower face of lid closely abuts, and the sealing ring is used for the junction for sealing the upper end cover and the bottom end cover.
Further, the bottom end cover is the shell-like structure of bottom opening, and the upper end cover is fixedly arranged on the bottom end cover
Top.
Further, anti-water cavity is provided with the bottom end cover, the anti-water cavity is located at the interior of the second annular groove
Side；
The frequency converter further includes controller, alarm and the sensor for monitoring water level in the anti-water cavity, described
Controller is fixedly arranged on the inside of the bottom end cover, and the sensor is fixedly arranged in the anti-water cavity, and the alarm is fixedly arranged on institute
State on the outer wall of bottom end cover；The sensor and the alarm are electrically connected with the controller.The alarm is used for
Alarm is sent when entering water in the anti-water cavity.
Further, the bottom of the anti-water cavity is provided with discharge outlet, and plug is fixedly installed in the discharge outlet.
Further, the discharge outlet is multiple.
Further, it is provided with radiator on the upper end cover.
Further, the radiator is radiating fin.
Further, it is additionally provided with terminal box on the upper end cover.
Further, the one end of the terminal box away from the upper end cover is installed with water-proof connector.
Frequency converter provided by the utility model having the beneficial effect that compared with prior art：
Frequency converter provided by the utility model includes transducer body, upper end cover and bottom end cover, and transducer body is fixed and set
Upper end cover is placed in enclose in the accommodating chamber being set as with bottom end cover.The one end for being used to be connected with bottom end cover on upper end cover is provided with the first ring
Shape boss, the one end for being used on bottom end cover be connected with upper end cover are provided with first annular groove, and first annular boss is caught in first
In annular groove, the barrier of barrier effect can be played together with upper end cover is formed with the junction of bottom end cover, to a certain extent
Prevent water from being entered by the junction of the two to be provided with the accommodating chamber of transducer body.The inner side of first annular groove on bottom end cover
Second annular groove is provided with, sealing ring is set in second annular groove, sealing ring is capable of the company of sealed upper end lid and bottom end cover
Place is met, further prevents the water in the external world from entering accommodating chamber by junction, reduces when frequency converter uses in environment of paddling and intake
Risk.
Second purpose of the utility model is to provide a kind of aerator, to alleviate frequency converter existing in the prior art
Waterproof measure is not provided with, in use, there is the technical problem of water inlet risk in environment of paddling.
Aerator provided by the utility model is provided with the frequency converter described in the above.
Aerator provided by the utility model having the beneficial effect that compared with prior art：
Frequency converter includes transducer body, upper end cover and bottom end cover, frequency converter sheet in aerator provided by the utility model
Body is fixedly installed on upper end cover and is enclosed with bottom end cover in the accommodating chamber being set as.The one end for being used to be connected with bottom end cover on upper end cover is set
There is first annular boss, the one end for being used to be connected with upper end cover on bottom end cover is provided with first annular groove, first annular boss
The barrier of barrier effect can be played together with upper end cover is formed with the junction of bottom end cover by being caught in first annular groove, certain
Prevent water from being entered by the junction of the two to be provided with the accommodating chamber of transducer body in degree.First annular groove on bottom end cover
Inner side be provided with second annular groove, sealing ring is set in second annular groove, and sealing ring being capable of sealed upper end lid and lower end
The junction of lid, further prevents the water in the external world from entering accommodating chamber by junction, reduces frequency converter and used in environment of paddling
The risk of Shi Jinshui.
Brief description of the drawings
, below will be right in order to illustrate more clearly of the utility model embodiment or technical solution of the prior art
Embodiment or attached drawing needed to be used in the description of the prior art are briefly described, it should be apparent that, describe below
In attached drawing be the utility model some embodiments, for those of ordinary skill in the art, do not paying creativeness
On the premise of work, other attached drawings can also be obtained according to these attached drawings.
Fig. 1 is the dimensional structure diagram for the frequency converter that the utility model embodiment one provides；
Fig. 2 is the front view of the frequency converter shown in Fig. 1；
Fig. 3 is the dimensional structure diagram of bottom end cover in the frequency converter that the utility model embodiment one provides；
Fig. 4 is the sectional view of the bottom end cover shown in Fig. 3.
Icon：1- upper end covers；2- bottom end covers；11- radiating fins；12- terminal boxes；21- first annular grooves；
22- second annular grooves；The anti-water cavities of 23-.
Embodiment
The technical solution of the utility model is clearly and completely described below in conjunction with attached drawing, it is clear that described
Embodiment is the utility model part of the embodiment, instead of all the embodiments.Based on the embodiment in the utility model, sheet
Field those of ordinary skill all other embodiments obtained without making creative work, belong to this practicality
Novel protected scope.
, it is necessary to explanation in the description of the utility model, term " " center ", " on ", " under ", it is "left", "right", " perpendicular
Directly ", the orientation of the instruction such as " level ", " interior ", " outer " or position relationship are based on orientation shown in the drawings or position relationship, are only
Described for the ease of description the utility model and simplifying, rather than instruction or imply signified device or element must have it is specific
Orientation, with specific azimuth configuration and operation, therefore it is not intended that limitation to the utility model.In addition, term " the
One ", " second ", " the 3rd " are only used for description purpose, and it is not intended that instruction or hint relative importance.
, it is necessary to which explanation, unless otherwise clearly defined and limited, term " are pacified in the description of the utility model
Dress ", " connected ", " connection " should be interpreted broadly, for example, it may be fixedly connected or be detachably connected, or integratedly
Connection；Can mechanically connect or be electrically connected；It can be directly connected, can also be indirectly connected by intermediary,
It can be the connection inside two elements.For the ordinary skill in the art, above-mentioned art can be understood with concrete condition
Concrete meaning of the language in the utility model.
Embodiment one
As depicted in figs. 1 and 2, frequency converter provided in this embodiment includes transducer body, upper end cover 1 and bottom end cover 2, on
End cap 1 is fixedly connected with bottom end cover 2, encloses the accommodating chamber being set as installing transducer body.
Be used for one end for be connected with bottom end cover 2 on upper end cover 1 and be provided with first annular boss, on bottom end cover 2 for
One end that end cap 1 connects is provided with first annular groove 21, and first annular boss can be caught in first annular groove 21.
Second annular groove 22 is additionally provided with bottom end cover 2, the outside diameter of second annular groove 22 is less than first annular groove
21 internal diameter.One sealing ring is arranged in second annular groove 22, and the upper surface of sealing ring and the lower face of upper end cover 1 are close
Abut, sealing ring is used for the junction of sealed upper end lid 1 and bottom end cover 2.
Frequency converter provided in this embodiment includes transducer body, upper end cover 1 and bottom end cover 2, and transducer body is fixed and set
Upper end cover 1 is placed in enclose in the accommodating chamber being set as with bottom end cover 2.It is used for one end for being connected with bottom end cover 2 on upper end cover 1 and is provided with the
One annular convex platform, the one end for being used on bottom end cover 2 be connected with upper end cover 1 are provided with first annular groove 21, first annular boss
The barrier of barrier effect can be played together with upper end cover 1 is formed with the junction of bottom end cover 2 by being caught in first annular groove 21,
Prevent water from being entered by the junction of the two to be provided with the accommodating chamber of transducer body to a certain extent.First ring on bottom end cover 2
The inner side of connected in star 21 is provided with second annular groove 22, and sealing ring is set in second annular groove 22, and sealing ring can seal
The junction of upper end cover 1 and bottom end cover 2, further prevents the water in the external world from entering accommodating chamber by junction, reduces frequency converter and exist
Paddle use in environment when the risk intake, the Electrical Safety of frequency converter in water has been effectively ensured.
Specifically, the shape of upper end cover 1 and bottom end cover 2 all can be round table-like, upper end cover 1 can be arranged at bottom end cover 2
Top, at this time, the accommodating chamber being set as installing transducer body is enclosed in the top end face of bottom end cover 2 with upper end cover 1.Upper end cover
1 is fixedly connected with bottom end cover 2, can be bolted.
In the present embodiment, bottom end cover 2 can be the shell-like structure of bottom opening, and upper end cover 1 is fixedly arranged on the top of bottom end cover 2
Portion.
Bottom end cover 2 is the shell-like structure of bottom opening, and upper end cover 1 is fixedly arranged on the top of bottom end cover 2, and bottom end cover 2 can be right
Upper end cover 1 is played a supporting role, and can also increase the transducer body in upper end cover 1 and accommodating chamber with a distance from the water surface, favorably
Enter the possibility of accommodating chamber in the water for reducing the external world.
Specifically, bottom end cover 2 can be the round-like structure of bottom opening, at this point it is possible to be the top end diameter of bottom end cover 2
Less than its bottom diameter.
As shown in Figure 3 and Figure 4, anti-water cavity 23 can be provided with the present embodiment, on bottom end cover 2, anti-water cavity 23 is positioned at the
The inner side of second ring groove 22.
Frequency converter can also include controller, alarm and the sensor for monitoring water level in anti-water cavity 23, controller
Be fixedly arranged on the inside of bottom end cover 2, sensor is fixedly arranged in anti-water cavity 23, and alarm is fixedly arranged on the outer wall of bottom end cover 2, for
Alarm is sent when entering water in anti-water cavity 23.Sensor and alarm are electrically connected with the controller.
Anti- water cavity 23 is set on bottom end cover 2, and anti-water cavity 23 is located at the inner side of second annular groove 22, for monitoring waterproof
The sensor of water level is arranged in anti-water cavity 23 in chamber 23, and alarm is fixedly arranged on the outer wall of bottom end cover 2, when Sensor monitoring arrives
When entering water in anti-water cavity 23, signal will be transmitted to controller, controller then can control report according to the signal that sensor transmits
Alert device sends alarm, enables people to be disposed as early as possible after having water entrance in frequency converter.
Specifically, the opening direction of anti-water cavity 23 can towards the direction where upper end cover 1, at this time, if extraneous water by
The junction of upper end cover 1 and bottom end cover 2 enters accommodating chamber and flows into waterproof chamber 23, then alarm can send alarm.
Alternatively, the opening direction of anti-water cavity 23 can deviate from the direction of upper end cover 1, at this time, if extraneous
Water anti-water cavity 23 is entered by the bottom of bottom end cover 2, then alarm can send alarm.Because bottom end cover 2 is located under accommodating chamber
Side, if so extraneous water immersion frequency converter, can first flow into bottom end cover 2, enter waterproof by the bottom of bottom end cover 2 in water
23 alarm device of chamber sends alarm, and people can make a response in advance before transducer body touches water, be conducive to frequency conversion
The waterproof of device body.
In the present embodiment, the bottom of anti-water cavity 23 can be provided with discharge outlet, plug is fixedly installed in discharge outlet, specifically
, discharge outlet can be multiple.
Discharge outlet is set in the bottom of anti-water cavity 23, easy to which the water for entering anti-water cavity 23 is discharged.
In the present embodiment, radiator can be provided with upper end cover 1.
Radiator is set on upper end cover 1, is conducive to the heat dissipation of frequency converter.
In the present embodiment, radiator can be radiating fin 11.
Radiator is radiating fin 11, is radiated by way of increasing cooling surface area, and not only heat dissipation effect is relatively good,
And make also lighter.
In the present embodiment, terminal box 12 is also provided with upper end cover 1.
Terminal box 12 is set on upper end cover 1, easy to the connection of frequency converter and external power supply.
In the present embodiment, the one end of terminal box 12 away from upper end cover 1 can be installed with water-proof connector.
Water-proof connector is set in the one end of terminal box 12 away from upper end cover 1, External cable is connected into by water-proof connector
Terminal box 12, makes the water resistance of terminal box 12 more preferable, is also beneficial to improve the safety in utilization of frequency converter.
In addition, the front end of terminal box 12 is also provided with earth leakage protective, being also provided with frequency converter upper end cover 1 can
By ground wire.
Embodiment two
Aerator provided in this embodiment is provided with the frequency converter of the offer of embodiment one.
In aerator provided in this embodiment, frequency converter includes transducer body, upper end cover 1 and bottom end cover 2, frequency converter sheet
Body is fixedly installed on upper end cover 1 and is enclosed with bottom end cover 2 in the accommodating chamber being set as.It is used for the one end being connected with bottom end cover 2 on upper end cover 1
It is provided with first annular boss, the one end for being used to be connected with upper end cover 1 on bottom end cover 2 is provided with first annular groove 21, and first
Annular convex platform, which is caught in first annular groove 21, to play barrier effect together with upper end cover 1 is formed with the junction of bottom end cover 2
Barrier, prevent to a certain extent water by the two junction enter be provided with the accommodating chamber of transducer body.Bottom end cover 2
The inner side of upper first annular groove 21 is provided with second annular groove 22, and sealing ring, sealing ring are set in second annular groove 22
It is capable of the junction of sealed upper end lid 1 and bottom end cover 2, further prevents the water in the external world from entering accommodating chamber by junction, reduce
The risk that frequency converter is intake when being used in environment of paddling.
In aerator provided in this embodiment, frequency converter includes transducer body, upper end cover 1 and bottom end cover 2, upper end cover 1
It is fixedly connected with bottom end cover 2, encloses the accommodating chamber being set as installing transducer body.
Be used for one end for be connected with bottom end cover 2 on upper end cover 1 and be provided with first annular boss, on bottom end cover 2 for
One end that end cap 1 connects is provided with first annular groove 21, and first annular boss can be caught in first annular groove 21.
Second annular groove 22 is additionally provided with bottom end cover 2, the outside diameter of second annular groove 22 is less than first annular groove
21 internal diameter.One sealing ring is arranged in second annular groove 22, and the upper surface of sealing ring and the lower face of upper end cover 1 are close
Abut, sealing ring is used for the junction of sealed upper end lid 1 and bottom end cover 2.
Specifically, the shape of upper end cover 1 and bottom end cover 2 all can be round table-like, upper end cover 1 is fixedly connected with bottom end cover 2,
Can be bolted.
In the present embodiment, bottom end cover 2 can be the shell-like structure of bottom opening, and upper end cover 1 is fixedly arranged on the top of bottom end cover 2
Portion.
Anti- water cavity 23 can be provided with the present embodiment, on bottom end cover 2, anti-water cavity 23 is located at the interior of second annular groove 22
Side；
It is fixed that frequency converter further includes controller, alarm and the sensor for monitoring water level in anti-water cavity 23, controller
In the inside of bottom end cover 2, sensor is fixedly arranged in anti-water cavity 23, and alarm is fixedly arranged on the outer wall of bottom end cover 2；Sensor and report
Alert device is electrically connected with the controller.
Anti- water cavity 23 is set on bottom end cover 2, and anti-water cavity 23 is located at the inner side of second annular groove 22, for monitoring waterproof
The sensor of water level is arranged in anti-water cavity 23 in chamber 23, and alarm is fixedly arranged on the outer wall of bottom end cover 2, when Sensor monitoring arrives
When entering water in anti-water cavity 23, signal will be transmitted to controller, controller then can control report according to the signal that sensor transmits
Alert device sends alarm, enables people to be disposed as early as possible after having water entrance in frequency converter.
Specifically, sensor can be water level sensor；The opening direction of anti-water cavity 23 can be towards the place of upper end cover 1
Direction, at this time, if extraneous water enters accommodating chamber by the junction of upper end cover 1 and bottom end cover 2 and flows into waterproof chamber 23, alarms
Device can send alarm.
Alternatively, the opening direction of anti-water cavity 23 can deviate from the direction of upper end cover 1, at this time, if extraneous
Water anti-water cavity 23 is entered by the bottom of bottom end cover 2, then alarm can send alarm.
In the present embodiment, the bottom of anti-water cavity 23 can be provided with discharge outlet, and plug is fixedly installed in discharge outlet.
In the present embodiment, discharge outlet can be multiple.
In the present embodiment, radiator can be provided with upper end cover 1.
In the present embodiment, radiator can be radiating fin 11.
In the present embodiment, terminal box 12 is also provided with upper end cover 1.
In the present embodiment, the one end of terminal box 12 away from upper end cover 1 can be installed with water-proof connector.
Finally it should be noted that：Various embodiments above is only to illustrate the technical solution of the utility model, rather than it is limited
System；Although the utility model is described in detail with reference to foregoing embodiments, those of ordinary skill in the art should
Understand：It can still modify the technical solution described in foregoing embodiments, either to which part or whole
Technical characteristic carries out equivalent substitution；And these modifications or replacement, the essence of appropriate technical solution is departed from this practicality newly
The scope of each embodiment technical solution of type.
Claims (10)
- A kind of 1. frequency converter, it is characterised in that including transducer body, upper end cover (1) and bottom end cover (2), the upper end cover (1) It is fixedly connected with the bottom end cover (2), encloses the accommodating chamber being set as installing the transducer body；The one end for being used to be connected with the bottom end cover (2) on the upper end cover (1) is provided with first annular boss, the bottom end cover (2) one end for being used to be connected with the upper end cover (1) on is provided with first annular groove (21), and the first annular boss can It is caught in the first annular groove (21)；Second annular groove (22) is additionally provided with the bottom end cover (2), the outside diameter of the second annular groove (22) is less than institute State the internal diameter of first annular groove (21)；One sealing ring is arranged in the second annular groove (22), and the sealing ring Upper surface is closely abutted with the lower face of the upper end cover (1).
- 2. frequency converter according to claim 1, it is characterised in that the bottom end cover (2) is the shell-like structure of bottom opening, The upper end cover (1) is fixedly arranged on the top of the bottom end cover (2).
- 3. frequency converter according to claim 2, it is characterised in that be provided with anti-water cavity (23), institute on the bottom end cover (2) State the inner side that anti-water cavity (23) is located at the second annular groove (22)；The frequency converter further includes controller, alarm and the sensor for monitoring water level in the anti-water cavity (23), described Controller is fixedly arranged on the inside of the bottom end cover (2), and the sensor is fixedly arranged in the anti-water cavity (23), and the alarm is consolidated On the outer wall of the bottom end cover (2)；The sensor and the alarm are electrically connected with the controller.
- 4. frequency converter according to claim 3, it is characterised in that the bottom of the anti-water cavity (23) is provided with discharge outlet, Plug is fixedly installed in the discharge outlet.
- 5. frequency converter according to claim 4, it is characterised in that the discharge outlet is multiple.
- 6. according to claim 1-5 any one of them frequency converters, it is characterised in that be provided with heat dissipation on the upper end cover (1) Device.
- 7. frequency converter according to claim 6, it is characterised in that the radiator is radiating fin (11).
- 8. according to claim 1-5 any one of them frequency converters, it is characterised in that be additionally provided with and connect on the upper end cover (1) Wire box (12).
- 9. frequency converter according to claim 8, it is characterised in that the remote upper end cover (1) of the terminal box (12) One end is installed with water-proof connector.
- 10. a kind of aerator, it is characterised in that be provided with claim 1-9 any one of them frequency converters.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201721371810.3U CN207354044U (en) | 2017-10-24 | 2017-10-24 | Frequency converter and aerator |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201721371810.3U CN207354044U (en) | 2017-10-24 | 2017-10-24 | Frequency converter and aerator |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN207354044U true CN207354044U (en) | 2018-05-11 |
Family
ID=62356268
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201721371810.3U Expired - Fee Related CN207354044U (en) | 2017-10-24 | 2017-10-24 | Frequency converter and aerator |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN207354044U (en) |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN108868818A (en) * | 2018-08-03 | 2018-11-23 | 中国电建集团铁路建设有限公司 | A kind of shield duct piece hole for hoist sealing cover |
-
2017
- 2017-10-24 CN CN201721371810.3U patent/CN207354044U/en not_active Expired - Fee Related
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN108868818A (en) * | 2018-08-03 | 2018-11-23 | 中国电建集团铁路建设有限公司 | A kind of shield duct piece hole for hoist sealing cover |
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| Date | Code | Title | Description |
|---|---|---|---|
| GR01 | Patent grant | ||
| GR01 | Patent grant | ||
| CF01 | Termination of patent right due to non-payment of annual fee |
Granted publication date: 20180511 |