CN204538843U - A kind of closed resistant to ammonia motor - Google Patents
A kind of closed resistant to ammonia motor Download PDFInfo
- Publication number
- CN204538843U CN204538843U CN201520234480.8U CN201520234480U CN204538843U CN 204538843 U CN204538843 U CN 204538843U CN 201520234480 U CN201520234480 U CN 201520234480U CN 204538843 U CN204538843 U CN 204538843U
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- binding post
- ammonia
- ceramic insulator
- conductor
- resistant
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Abstract
The utility model discloses a kind of closed resistant to ammonia motor, the inwall of the ceramic insulator in its connection terminal structure is close to the outer ring surface of binding post electric-conductor, the part that binding post electric-conductor is positioned at housing cavity is provided with fluoroplastic layer, the inner face of ceramic insulator is close in the outer face of fluoroplastic layer, fluoroplastic layer guarantees insulating properties, sealed by ceramic insulator between binding post electric-conductor and binding post outlet, ceramic insulator can not be subject to the corrosion of ammonia, the terminal outlet position of housing is not corroded, ensure the sealing of ammonia, guarantee the normal work of motor, normal refrigeration.Traditional form using woven fiberglass tape as Binding material is substituted for by fluoroplastic tape, motor is made to fill the forward and backward insulating resistance value of ammonia all more than 500 megaohms, and when adding a small amount of part, the insulating resistance value of motor still remains unchanged, and effectively improves because the technical problem selecting woven fiberglass tape to bring as Binding material.
Description
Technical field
The utility model relates to refrigeration motor technical field, relates to a kind of closed resistant to ammonia motor specifically.
Background technology
Going from bad to worse along with environment, original fluorine chlorine hold high cold-producing medium gradually replace by ammonia refrigerant, be called new cold-producing medium material.Ammonia is warm cold-producing medium in pressing in current the most widely used one, the setting temperature of ammonia is-77.7 DEG C, standard vaporization temperature is-33.3 DEG C, and condensing pressure is generally 1.1 ~ 1.3MPa at normal temperatures, though when summer coolant water temperature up to also must not more than 1.5MPa when 30 DEG C.The unit norm volume refrigerating capacity compressor of ammonia is approximately 520kcal/m
3.
Using the cold-producing medium of ammonia as the inside of compressor, manufacture motor, and then manufacture refrigeration plant, will trend of the times be become.But existing general standard electromotor, or the motor of other type, the main temperature resistant grade considering motor, and its insulating material material be difficult to find can steady operation in liquid ammonia, such as insulating paper, electromagnetic wire, impregnating varnish etc.
Chemical corrosivity and a small amount of moisture of ammonia are combined in the electric conducting material namely existing insulation material layer becoming ionic, namely when ammonia is attached to common insulating material surface, just define conductive layer, this is also that other seems the motor insulating material that can work in ammonia, the main cause that in fact all can not work in ammonia environment at present.
Therefore the structure of existing motor can not guarantee the normal operation of ammonia as the motor of cold-producing medium.Therefore, inventor of the present utility model needs a kind of new technology of design badly to improve its problem.
Utility model content
The utility model aims to provide a kind of closed resistant to ammonia motor that can normally run in ammonia environment.
For solving the problems of the technologies described above, the technical solution of the utility model is:
A kind of closed resistant to ammonia motor, comprise stator core, be wrapped in the stator winding in described stator core slot, the slot liner of stator winding described in insulation gap and the slot wedge of fixing described stator winding, wherein said stator winding has interpolar line lead-out wire, the end of described interpolar line lead-out wire has binding post, described binding post comprises housing, ammonia is furnished with as cold-producing medium in the inner chamber of described housing, described housing is provided with binding post outlet, binding post electric-conductor runs through the outlet of described binding post, the position that described binding post electric-conductor corresponds to the outlet of described binding post is set with ceramic insulator, the inwall of described ceramic insulator is close to the outer ring surface of described binding post electric-conductor, the outer ring surface of described ceramic insulator is close to the inwall of described binding post outlet, the inner of described ceramic insulator extends in the inner chamber of described housing, the part that described binding post electric-conductor is positioned at described housing cavity is provided with fluoroplastic layer, the inner face of described ceramic insulator is close in the outer face of described fluoroplastic layer, described binding post electric-conductor is specially aluminium material or stainless steel.
Further, two ends of described stator winding are bundled by binder, and the material of described binder is fluoroplastic tape.
Further, the slot-open-section at the two ends of described stator core is fixed by nylon locking button.
Further, at least one wiring nut sleeve is loaded on described outer end external screw thread, inner external screw thread respectively, leaves spacing between the end face being positioned at two the adjacent described wiring nuts on same section of external screw thread; Described fluoroplastic layer covers in the described wiring nut on described inner segment external screw thread, guarantees the outer field insulating properties of wiring nut, and the outer ring surface of the skin connection wire of described wiring nut is provided with fluoroplastic layer equally.
Further, described binding post outlet is stepped hole structure, the inner segment of described stepped hole structure is large gauge structure, outer end is little gauge structure, the inner side of described stepped hole structure is also provided with male structure in riveting, the middle end position of described ceramic insulator is boss structure, the gulde edge of described stepped hole structure is close in the outer face of described boss structure, the inner face of described boss structure wrap up by male structure in the riveting after riveting.
Further, between the outer face of described boss structure and the gulde edge of described stepped hole structure, metal seal is housed; Between male structure, riveting copper ring is housed in riveting after the inner face of described boss structure and riveting; Between the outer ring surface of described boss structure and the inwall of large gauge structure, the first resistant to ammonia sealing ring is housed.
Further, the back-end location that described binding post electric-conductor corresponds to described ceramic insulator is provided with the paniculidine bit architecture closed up from inside to outside, inner chamber corresponding to described ceramic insulator is provided with circular cone positioning chamber, and described paniculidine bit architecture is positioned described circular cone positioning chamber.
Further, the thickness position place that described binding post electric-conductor corresponds to the outlet of described binding post is respectively arranged with two ring grooves, two the second resistant to ammonia sealing rings are set with in the described ring groove of correspondence, and the outer ring surface of described second resistant to ammonia sealing ring is close to the inwall of described ceramic insulator.
Further, described stator winding is the aluminium conductor electromagnetic wire being coated with polyphenylene sulfide; Described slot liner is the compound inslation cloth of alkali-free glass fiber cloth coating fluoroplastics; Described slot wedge is fluoroplastic plate; Described interpolar line lead-out wire outer cover is provided with fluoroplastics and glass fibre sleeve.
Further, described stator winding comprises upper strata winding, lower floor's winding, carries out interval between described upper strata winding, lower floor's winding by layer insulation.
Adopt technique scheme, the utility model at least comprises following beneficial effect:
1. closed resistant to ammonia motor described in the utility model, adopt the structure of unique binding post, the inwall of its ceramic insulator is close to the outer ring surface of binding post electric-conductor, the outer ring surface of ceramic insulator is close to the inwall of binding post outlet, the part that binding post electric-conductor is positioned at housing cavity is provided with fluoroplastic layer, the inner face of ceramic insulator is close in the outer face of fluoroplastic layer, fluoroplastic layer guarantees insulating properties, sealed by ceramic insulator between binding post electric-conductor and binding post outlet, ceramic insulator can not be subject to the corrosion of ammonia, the terminal outlet position of housing is not corroded, ensure the sealing of ammonia, guarantee the normal work of motor, normal refrigeration.
2. closed resistant to ammonia motor described in the utility model, traditional form using woven fiberglass tape as Binding material is substituted for by fluoroplastic tape, motor is made to fill the forward and backward insulating resistance value of ammonia all more than 500 megaohms, and when adding a small amount of part, the insulating resistance value of motor still remains unchanged, and effectively improves because the technical problem selecting woven fiberglass tape to bring as Binding material.
3. closed resistant to ammonia motor described in the utility model, by the mechanical fixation of nylon locking button, can effectively prevent motor mechanical oscillation operationally from causing the damage of winding, and the convenience simple to operation of nylon locking button, inexpensive and reliable.
Accompanying drawing explanation
Fig. 1 is the structural representation of the binding post of closed resistant to ammonia motor described in the utility model;
Fig. 2 is the front view of the stator winding of closed resistant to ammonia motor described in the utility model;
Fig. 3 is the structural representation of closed resistant to ammonia motor nylon locking button described in the utility model;
Fig. 4 is the left view of closed resistant to ammonia motor stator winding described in the utility model;
Fig. 5 is the extraction schematic diagram of closed resistant to ammonia motor stator winding described in the utility model;
Fig. 6 is the end wrapping schematic diagram of closed resistant to ammonia motor stator winding described in the utility model.
Wherein: housing 1, binding post outlet 2, binding post electric-conductor 3, ceramic insulator 4, outer end external screw thread 5, inner external screw thread 6, locking nut 7, wiring nut 8, male structure 9 in riveting, boss structure 10, gulde edge 11, metal seal 12, riveting copper ring 13, first resistant to ammonia sealing ring 14, paniculidine bit architecture 15, ring groove 16, second resistant to ammonia sealing ring 17, fluoroplastic layer 18, stator core 21, stator winding 22, upper strata winding 220, lower floor's winding 221, slot liner 23, slot wedge 24, binding post 25, binder 26, interpolar line lead-out wire 27, layer insulation 28, button tongue 29, tongue apertures 30, teeth groove 31, sour jujube 32.
Embodiment
Below in conjunction with drawings and Examples, the utility model is further illustrated.
As shown in Figures 1 to 6, for meeting the closed resistant to ammonia motor of one of the present utility model, comprise stator core 21, be wrapped in the stator winding 22 in described stator core 21 groove, the slot liner 23 of stator winding 22 described in insulation gap and the slot wedge 24 of fixing described stator winding 22, wherein said stator winding 22 has interpolar line lead-out wire 27, the end of described interpolar line lead-out wire 27 has binding post 25, described binding post 25 comprises housing 1, ammonia is furnished with as cold-producing medium in the inner chamber of housing 1, housing 1 is provided with binding post outlet 2, binding post electric-conductor 3 runs through binding post outlet 2, the position that binding post electric-conductor 3 corresponds to binding post outlet 2 is set with ceramic insulator 4, the inwall of ceramic insulator 4 is close to the outer ring surface of binding post electric-conductor 3, the outer ring surface of ceramic insulator 4 is close to the inwall of binding post outlet 2, the inner of ceramic insulator 4 extends in the inner chamber of housing 1, guarantee that the ammonia in housing 1 can not be revealed, the part that binding post electric-conductor 3 is positioned at housing 1 inner chamber is provided with fluoroplastic layer 18, the inner face of ceramic insulator 4 is close in the outer face of fluoroplastic layer 18.
Binding post electric-conductor 3 is specially aluminium material or stainless steel, guarantee conductivity and not corrode by ammonia; Because copper is easily by ammonia corrosion, therefore do not adopt copper; The outer end anchor ring of binding post electric-conductor 3, inner anchor ring have outer end external screw thread 5, inner external screw thread 6, the outer end of ceramic insulator 4 extends to the outside of the inner terminal of outer end external screw thread 5, is fastenedly connected until the inner face of locking nut 7 press-fits the outer face in ceramic insulator 4 after locking nut 7 is set in outer end external screw thread 5.
At least one wiring nut 8 overlaps and is loaded on outer end external screw thread 5, inner external screw thread 6 respectively, leaves spacing, guarantee that wiring is carried out smoothly between the end face being positioned at two the adjacent wiring nuts 8 on same section of external screw thread; Fluoroplastic layer 18 covers in the wiring nut 8 on inner segment external screw thread 6, guarantees the outer field insulating properties of wiring nut 8, and the outer ring surface of the skin connection wire of wiring nut 8 is provided with fluoroplastic layer (not shown in FIG.) equally.
Binding post outlet 2 is specially stepped hole structure, the inner segment of stepped hole structure is large gauge structure, outer end is little gauge structure, the inner side of stepped hole structure is also provided with male structure 9 in riveting, the middle end position of ceramic insulator 4 is boss structure 10, the gulde edge 11 of stepped hole structure is close in the outer face of boss structure 10, the inner face of boss structure 10 wrap up by male structure 9 in the riveting after riveting;
Between the outer face of boss structure 10 and the gulde edge 11 of stepped hole structure, metal seal 12 is housed, guarantees sealing; Between male structure 9, riveting copper ring 13 being housed in riveting after the inner face of boss structure 10 and riveting, guaranteeing the sealing of riveting, is strengthen sealing property and mechanical strength, needs to be coated with adhesive glue during riveting; Between the outer ring surface of boss structure 10 and the inwall of large gauge structure, the first resistant to ammonia sealing ring 14 is housed, guarantees sealing further.
The back-end location that binding post electric-conductor 3 corresponds to ceramic insulator 4 is provided with the paniculidine bit architecture 15 closed up from inside to outside, inner chamber corresponding to ceramic insulator 4 is provided with circular cone positioning chamber, paniculidine bit architecture 15 is positioned circular cone positioning chamber, guarantees the accurate positioning of binding post electric-conductor 3 and ceramic insulator 4.
The thickness position place that binding post electric-conductor 3 corresponds to binding post outlet 2 is respectively arranged with two ring grooves 16, two the second resistant to ammonia sealing rings 17 are set with in the ring groove 16 of correspondence, the outer ring surface of the second resistant to ammonia sealing ring 17 is close to the inwall of ceramic insulator 4, guarantees that the sealing of the inwall of the outer ring surface of binding post electric-conductor 3, ceramic insulator 4 is installed.
Its assembly relation is as follows: be set with in the ring groove 16 of correspondence by two the second resistant to ammonia sealing rings 17 in advance, by metal seal 12, riveting copper ring 13, ceramic insulator 4, first resistant to ammonia sealing ring 14 by male structure 9 riveting in riveting at housing 1, by binding post electric-conductor 3 from inside to outside plug-in mounting in the central through-hole of ceramic insulator 4, then locking nut 11 locked afterwards, be screwed into wiring nut 12, the upper fluoroplastic layer 18 of encapsulation afterwards, namely assembling is completed, also need during assembling to be coated with resistant to ammonia fluid sealant, guarantee sealing; Its assembling is simple, is suitable for industrialized mass and uses.
After adopting structure of the present utility model, the inwall of ceramic insulator is close to the outer ring surface of binding post electric-conductor 3, the outer ring surface of ceramic insulator 4 is close to the inwall of binding post outlet, the part that binding post electric-conductor 3 is positioned at housing cavity is provided with fluoroplastic layer 18, the inner face of ceramic insulator 14 is close in the outer face of fluoroplastic layer 18, fluoroplastic layer 18 guarantees insulating properties, sealed by ceramic insulator 4 between binding post electric-conductor 3 and binding post outlet 2, ceramic insulator 4 can not be subject to the corrosion of ammonia, the terminal outlet position of housing is not corroded, ensure the sealing of ammonia, guarantee the normal work of motor, normal refrigeration.
Two ends of described stator winding 22 are bundled by binder 26, and the material of described binder 26 is fluoroplastic tape.Eliminate the Binding material-woven fiberglass tape adopted in conventional insulator system in the present embodiment, and use fluoroplastic tape instead and carry out colligation.Because at employing woven fiberglass tape as in the practice process of Binding material, we find the sodium got due to ammonia Zu in glass fibre, thus cause the insulation resistance on winding surface significantly to decline.Before not being filled with ammonia, the insulation resistance of motor is greater than 500 megaohms substantially, after being filled with ammonia, resistance value drops to below 0.1 megaohm (in system, the number of moisture content, directly has influence on electrical machine insulation resistance value, may be close to " 0 " megaohm time serious) very soon.And glass fiber tape is in use easy to the insulating barrier damaging electromagnetic wire top layer, exacerbates the decline of electrical machine insulation resistance after filling ammonia further.Therefore find after utility model people repeatedly creationary contrast test: after using fluorine plastic film instead, motor is filling the forward and backward insulating resistance value of ammonia all more than 500 megaohms, and when adding a small amount of part, the insulating resistance value of motor still remains unchanged, and effectively improves because the technical problem selecting woven fiberglass tape to bring as Binding material.Please those skilled in the art know, selecting of this Binding material is not that routine to material is selected, as everyone knows, Binding material various in style, hundreds of, thousand, and those skilled in the art can't pay attention to when selecting, be also difficult to find that the arch-criminal that resistance significantly declines is that selecting of Binding material is improper.Therefore be finding this technical problem or after great many of experiments, selecting fluoroplastic tape all obviously creative as Binding material.
The slot-open-section at the two ends of described stator core 21 is fixed by nylon locking button.The structure of described nylon locking button is see Fig. 3, and it comprises button tongue 29, tongue apertures 30, teeth groove 31 and sour jujube 32, uses middlely to penetrate in tongue apertures 30 by button tongue 29, and sour jujube 32 is combined with teeth groove 31, auto lock, thus reaches the effect of fastening coil.By the mechanical fixation of nylon locking button, can effectively prevent motor mechanical oscillation operationally from causing the damage of winding, and the convenience simple to operation of nylon locking button, inexpensive and reliable.
Described stator winding 22 is for being coated with the aluminium conductor electromagnetic wire of polyphenylene sulfide, and it can bear the corrosion of liquid, gaseous ammonia; Described slot liner 23 is the compound inslation cloth of alkali-free glass fiber cloth coating fluoroplastics, and it physical and chemical changes does not occur in the ammonia solution of gas, liquid; Described slot wedge 24 needs physical and chemical changes not to occur equally in the ammonia solution of gas, liquid, fluoroplastic plate is preferably in the present embodiment, and its performance than the laminate of the epoxy resin used in the early time and glass fibre is more stable, be more conducive to the fixing of coil and the electric property improving slot wedge, more be adapted at using in ammonia solution, and the simple selection of the change of this material not to current material, its selected principle can see the choosing principles of above-mentioned fluoroplastic tape; Described interpolar line lead-out wire 27 outer cover is provided with fluoroplastics stable in liquefied ammonia or gaseous ammonia and glass fibre sleeve.
Described stator winding 22 comprises upper strata winding 220, lower floor's winding 221, carries out interval between described upper strata winding 220, lower floor's winding 221 by layer insulation 28.When after the rule completing lower floor's winding 221 of stator winding 22 in stator core 21 groove, should layer insulation 28 be put in time, for ensureing the reliability of upper and lower two-layer winding insulation, layer insulation 28 should leave enough width, and makes sweep downward; Slot wedge 24 is squeezed into after slot liner 23 in opposite directions bending in stator core 21 groove after embedding by upper strata winding 220 again.
In order to fully test its performance, utility model people has done repeatedly test experiments, comprising ammonia test resistance in compressor and fill ammonia test for added water.Resistance to ammonia test carries out, by the impact of temperature difference per day in the condition of outdoor open-air atmosphere.Be filled with based on time at every turn, when hear fill ammonia pipe without obvious flowing sound time, namely close fill ammonia valve door (time is between 10 ~ 15 minutes).The inspection of insulation resistance has all been carried out every day in midway, does not find the phenomenon that insulation resistance reduces.(be preferably 15 days) after whole off-test, carried out last inspection to insulation resistance, no abnormal, namely resistant to ammonia is functional.Follow-up utility model people has added and has filled ammonia test for added water, is proved by test experiments, even if be mixed into more moisture in systems in which, in the static case, motor still can not be subject to comparatively significantly affecting.
Above an embodiment of the present utility model has been described in detail, but described content is only the preferred embodiment that the utility model is created, and can not be considered to for limiting practical range of the present utility model.All any equivalent variations done according to the utility model application range, all should still be within patent covering scope of the present utility model.
Claims (10)
1. a closed resistant to ammonia motor, it is characterized in that: comprise stator core, be wrapped in the stator winding in described stator core slot, the slot liner of stator winding described in insulation gap and the slot wedge of fixing described stator winding, wherein said stator winding has interpolar line lead-out wire, the end of described interpolar line lead-out wire has binding post, described binding post comprises housing, ammonia is furnished with as cold-producing medium in the inner chamber of described housing, described housing is provided with binding post outlet, binding post electric-conductor runs through the outlet of described binding post, the position that described binding post electric-conductor corresponds to the outlet of described binding post is set with ceramic insulator, the inwall of described ceramic insulator is close to the outer ring surface of described binding post electric-conductor, the outer ring surface of described ceramic insulator is close to the inwall of described binding post outlet, the inner of described ceramic insulator extends in the inner chamber of described housing, the part that described binding post electric-conductor is positioned at described housing cavity is provided with fluoroplastic layer, the inner face of described ceramic insulator is close in the outer face of described fluoroplastic layer, described binding post electric-conductor is specially aluminium material or stainless steel.
2. closed resistant to ammonia motor as claimed in claim 1, it is characterized in that: two ends of described stator winding are bundled by binder, the material of described binder is fluoroplastic tape.
3. closed resistant to ammonia motor as claimed in claim 2, is characterized in that: the slot-open-section at the two ends of described stator core is fixed by nylon locking button.
4. closed resistant to ammonia motor as claimed in claim 3, is characterized in that: at least one wiring nut sleeve is loaded on described outer end external screw thread, inner external screw thread respectively, leaves spacing between the end face being positioned at two the adjacent described wiring nuts on same section of external screw thread; Described fluoroplastic layer covers in the described wiring nut on described inner segment external screw thread, guarantees the outer field insulating properties of wiring nut, and the outer ring surface of the skin connection wire of described wiring nut is provided with fluoroplastic layer equally.
5. closed resistant to ammonia motor as claimed in claim 4, it is characterized in that: described binding post outlet is stepped hole structure, the inner segment of described stepped hole structure is large gauge structure, outer end is little gauge structure, the inner side of described stepped hole structure is also provided with male structure in riveting, the middle end position of described ceramic insulator is boss structure, the gulde edge of described stepped hole structure is close in the outer face of described boss structure, the inner face of described boss structure wrap up by male structure in the riveting after riveting.
6. closed resistant to ammonia motor as claimed in claim 5, is characterized in that: between the outer face of described boss structure and the gulde edge of described stepped hole structure, metal seal is housed; Between male structure, riveting copper ring is housed in riveting after the inner face of described boss structure and riveting; Between the outer ring surface of described boss structure and the inwall of large gauge structure, the first resistant to ammonia sealing ring is housed.
7. closed resistant to ammonia motor as claimed in claim 1, it is characterized in that: the back-end location that described binding post electric-conductor corresponds to described ceramic insulator is provided with the paniculidine bit architecture closed up from inside to outside, inner chamber corresponding to described ceramic insulator is provided with circular cone positioning chamber, and described paniculidine bit architecture is positioned described circular cone positioning chamber.
8. closed resistant to ammonia motor as claimed in claim 1, it is characterized in that: the thickness position place that described binding post electric-conductor corresponds to the outlet of described binding post is respectively arranged with two ring grooves, two the second resistant to ammonia sealing rings are set with in the described ring groove of correspondence, and the outer ring surface of described second resistant to ammonia sealing ring is close to the inwall of described ceramic insulator.
9. closed resistant to ammonia motor as described in as arbitrary in claim 1-8, is characterized in that: described stator winding is the aluminium conductor electromagnetic wire being coated with polyphenylene sulfide; Described slot liner is the compound inslation cloth of alkali-free glass fiber cloth coating fluoroplastics; Described slot wedge is fluoroplastic plate; Described interpolar line lead-out wire outer cover is provided with fluoroplastics and glass fibre sleeve.
10. closed resistant to ammonia motor as claimed in claim 9, is characterized in that: described stator winding comprises upper strata winding, lower floor's winding, carries out interval between described upper strata winding, lower floor's winding by layer insulation.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201520234480.8U CN204538843U (en) | 2015-04-17 | 2015-04-17 | A kind of closed resistant to ammonia motor |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201520234480.8U CN204538843U (en) | 2015-04-17 | 2015-04-17 | A kind of closed resistant to ammonia motor |
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| Publication Number | Publication Date |
|---|---|
| CN204538843U true CN204538843U (en) | 2015-08-05 |
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| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201520234480.8U Expired - Fee Related CN204538843U (en) | 2015-04-17 | 2015-04-17 | A kind of closed resistant to ammonia motor |
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| Country | Link |
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| CN (1) | CN204538843U (en) |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN104734390A (en) * | 2015-04-17 | 2015-06-24 | 苏州贝得科技有限公司 | Closed type ammonia-resistant motor |
-
2015
- 2015-04-17 CN CN201520234480.8U patent/CN204538843U/en not_active Expired - Fee Related
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN104734390A (en) * | 2015-04-17 | 2015-06-24 | 苏州贝得科技有限公司 | Closed type ammonia-resistant motor |
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Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| C14 | Grant of patent or utility model | ||
| GR01 | Patent grant | ||
| CF01 | Termination of patent right due to non-payment of annual fee | ||
| CF01 | Termination of patent right due to non-payment of annual fee |
Granted publication date: 20150805 Termination date: 20210417 |