CN202190233U - Isolated type explosion-proof high voltage soft start controller - Google Patents
Isolated type explosion-proof high voltage soft start controller Download PDFInfo
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- CN202190233U CN202190233U CN2011203185482U CN201120318548U CN202190233U CN 202190233 U CN202190233 U CN 202190233U CN 2011203185482 U CN2011203185482 U CN 2011203185482U CN 201120318548 U CN201120318548 U CN 201120318548U CN 202190233 U CN202190233 U CN 202190233U
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Abstract
The utility model discloses an isolated type explosion-proof high pressure soft start controller, comprising a main cavity body and a special wiring cavity body. The cavity walls of the main cavity body and the special wiring cavity body are made of thickened high-quality steel material, and are further provided with reinforcing ribs; a high voltage soft start controller is arranged in the cavity body, and incoming wires and outgoing wires of the high voltage soft start controller are connected with cables in the special wiring cavity body through explosion-proof wiring posts; the main cavity body is further provided with an explosion-proof door which is provided with an electric control element; and the cables in the special wiring cavity body penetrate through cable interfaces arranged thereon and are connected with an outside high voltage electric network and an electric motor. As each of the main cavity body and the special wiring cavity body of the isolated type explosion-proof high voltage soft start controller is provided with a sealing structure on each of the cables and assembly combination faces, the main cavity body and the special wiring cavity body as well as the cavity bodies and the outside environment are mutually isolated; when the inner part of any of the cavity bodies has flammable mixture which result in explosion, the cavity body cannot be damaged due to the thick cavity wall, and the other cavity body and the outside cannot be affected, thereby avoiding corresponding chain explosions in high risk places of coal mines, petroleum, chemical industry; and the isolated type explosion-proof high pressure soft start controller has good explosion-proof effect.
Description
Technical field
The utility model relates to a kind of explosion-proof type soft starting controller, specifically relates to the isolated explosion-proof type high pressure soft starting controller of a kind of high voltage (6KV/1OKV), high-power (300KW-4000KW).
Background technology
At some high-risk occasions (like colliery, chemical plant, oil plant etc.), often need to use high power motor.And high power motor is very low in during starts power factor, and voltage fluctuation is obvious, and this will cause very big harm to electrical network: can reduce the operational efficiency of other power equipment on the electrical network, reduce the useful life of equipment; In addition, when transient voltage occurs, can make motor produce vibrations, noise and too much heat.Equally, the surge that transition produces can make the power consumption efficiency of electrical network seriously descend, and the current loss of inductive load increases.
In the prior art, high pressure control of soft scheme has following several kinds:
1, self coupling soft-start by lowering voltage.Because the starting torque of customer requirements motor is 56% of a nominal torque, starting current must be less than 2.5 times of motor rated current.In view of the self coupling soft-start by lowering voltage has the level starting, it is difficult to realize the accurate control of starting process.
2, liquid resistance soft start.The liquid resistance is a kind of resistance that is formed by electrolyte, and the essence of its conduction is ionic conduction.Its resistance is proportional to the distance of two relative electrode plate, is inversely proportional to the conductivity of electrolyte.Conductivity can change through concentration of electrolyte, and the pole plate distance can be controlled in real time.The thermal capacity of liquid resistance is big.These two big characteristics (resistance can stepless control and thermal capacity big), soft start is needed exactly.Add that another crucial advantage is that low cost is widely used liquid resistance soft start.The shortcoming of liquid resistance soft start: the one, the liquid resistance box volume is big, soft start repeated relatively poor; The 2nd, need a cover servomechanism and drive movable plate electrode, movable plate electrode itself is exactly a potential safety hazard through the flexible cord conduction, and the movable plate electrode translational speed is slower, is difficult to realize the variation of start mode; The 3rd, liquid resistance soft starter device needs to safeguard that the water in the liquid case needs regular replenishment, and the battery lead plate long period of soaking is in electrolyte, and the surface has certain corrosion, needs to do the surface and handles (experience be 3-5 once); The 4th, liquid resistance soft starter device is not suitable for being seated in the easy scene that freezes.Its liquid resistance resistance can not be controlled in real time in addition, and starting process article confrontation environment for use dependence on temperature is big, starts having a big risk successfully.The above-mentioned shortcoming that exists makes this product application scenario be restricted, and generally is used for the starting of low grade products.
3, thyristor soft start.The thyristor soft start, the adjusting rapidity is good, closed-loop control, the menuization of start mode is compared with liquid resistance soft start, little, the compact conformation of its volume, maintenance is little, and is multiple functional, and menu is abundant, the starting good reproducibility, it is thorough to protect.These all are that liquid resistance soft start is difficult to be equal to.But thyristor soft start product also has shortcoming: the one, three to four thyristor series connection are all arranged on its each high-voltage bridge arms, and synchronous triggering is crucial, solves bad will causing and controls failure; The withstand voltage homogeneity question of thyristor in addition, promptly it has very high requirement to the consistency of each thyristor, if indivedual thyristor parameter changes or poor-performing, all can cause the soft start equipment fault; The 2nd, do nothing for wound-rotor asynchronous machine; The 3rd, the price of high die pressing product is too high, and these several shortcomings have hindered the fast development of thyristor soft start product.
4, quick resistance soft start frequently.Because frequency sensitive device spare itself not exclusively is a resistance, thereby power factor is lower; Secondly, be that adjustment is inconvenient, the blindness of adjustment is bigger, is difficult to control.
Above high pressure soft starter device does not all possess explosion prevention function is arranged, if in the colliery, high-risk occasions such as oil, chemical industry use and be easy to the accident of blasting, and are very dangerous.
Summary of the invention
To above-mentioned situation; The utility model provides a kind of isolated explosion-proof type high pressure soft starting controller; High pressure soft starter device to solve prior art in use is prone to the accident of blasting, and should not be used in the problem of high-risk occasions such as colliery, oil, chemical industry.
To achieve these goals, the technical scheme of the utility model is following:
Isolated explosion-proof type high pressure soft starting controller; Comprise main cavity and special-purpose wiring cavity; It is characterized in that; Said main cavity set inside has the high pressure soft starting controller, being connected through being arranged at the cable that is provided with in flame-proof type binding post and the special-purpose wiring cavity on the main cavity sidewall into and out of line of said high pressure soft starting controller; Form two spaces that isolate relatively through sealing ring between said main cavity and the special-purpose wiring cavity;
The chamber wall thickness of said main cavity and special-purpose wiring cavity is 10mm at least, and wall also is provided with reinforcement in the chamber of each cavity;
The rear and front end of said main cavity is provided with the thickening type flange, and the outer surface of said flange is provided with an end cap respectively, is provided with sealing gasket between said end cap and the flange; The right side of said main cavity be provided with one electric controling element is installed the flame proof door, between said electric controling element and the flame proof door through the sealing gasket sealing, between said flame proof door and the main cavity also through the sealing gasket sealing;
The chamber wall of the lower end of said special-purpose wiring cavity be provided with and special-purpose wiring cavity between the cable interface that seals; The cable that is connected with the flame-proof type binding post in the said special-purpose wire connection cavity passes this cable interface and is connected with motor with extraneous high-voltage fence, seals through seal nipple between said cable and the said cable interface.
Further; Said high pressure soft starting controller comprises major loop and control loop and isolating transformer; The high-pressure side of said motor and isolating transformer is connected in the major loop; The low-pressure side of isolating transformer is connected in the control loop; Said major loop connects three phase mains through high pressure incoming relay-protection circuit breaker, between the high-pressure side of high pressure incoming relay-protection circuit breaker and isolating transformer, also is in series with starting contactor, and on the series arm that the high-pressure side of isolating transformer and starting contactor constitute, is parallel with an operation contactor; Said control loop comprises thyristor groups and control unit, and said thyristor groups is connected with the low-pressure side of said isolating transformer, and the thyristor groups trigger electrode connects control unit, and the signal input part of control unit obtains synchronizing signal through a PT from major loop.
Further; Comprise the power supply of being with pressurizer in the described control unit that is connected on the thyristor groups trigger electrode; Central processing unit; The display that is connected with the central processing unit output, trigger and switching value output device, analog to digital converter that is connected with the central processing unit input and switching value entering apparatus.
Further, described switching value entering apparatus comprises filter circuit and photoisolator.
Further, described switching value output device comprises triode and relay.
The beneficial effect of the utility model is that main cavity, special-purpose wiring cavity and external environment are isolated mutually, therefore is independent of each other; When main cavity or special-purpose wiring inside cavity flammable mixtures occurs and blast; Can not cause damage because of the chamber wall is very thick; Thereby the heat that blast produces can be not excessive to extraneous yet, thereby avoid high-risk occasions such as colliery, oil, chemical industry that corresponding chain explosion takes place.Therefore, the utlity model has good explosion-proof effect, can adapt to high-risk site surrounding requirements such as colliery, oil, chemical industry.
In addition; The thyristor groups of high pressure soft starting controller is operated under the lower voltage; Solved that the thyristor that series connection all must be arranged on each high-voltage bridge arms in the prior art just can bear high pressure and the drawback brought has solved this key issue that the soft start of restriction thyristor is promoted.The controller of the utility model adopts isolating transformer, and the product technology of its isolating transformer is ripe, stable performance, and reliability is higher; And thyristor groups and control loop work in low-pressure side, so the controller of the utility model is not only simple in structure, and, stable performance, good reliability.The high pressure soft starting controller of the utility model; In whole starting process; Control loop can be controlled isolating transformer low-pressure side two ends electric current in real time effectively, thereby realizes the control to high-tension motor starting voltage and starting current, has reached the purpose of smooth start.The utility model has also that starting current is little, steadily reliable, the mechanical friction of priming speed, electrical network is impacted little, and the advantage that can adjust according to on-the-spot actual condition of starting curve.
Description of drawings
Fig. 1 is the structural representation of the isolated explosion-proof type high pressure of the utility model soft starting controller.
Fig. 2 is the left view of Fig. 1.
Fig. 3 is the right view of Fig. 1.
Fig. 4 is the electrical principle sketch map of the high pressure soft starting controller of the isolated explosion-proof type high pressure of the utility model soft starting controller.
Fig. 5 is the electrical principle sketch map of the control unit of the isolated explosion-proof type high pressure of the utility model soft starting controller.
Embodiment
For technological means, creation characteristic that the utility model is realized, reach purpose and be easy to understand understanding with effect, below in conjunction with concrete diagram, further set forth the utility model.
Referring to Fig. 1, Fig. 2, Fig. 3; Isolated explosion-proof type high pressure soft starting controller; Comprise main cavity 100 and special-purpose wiring cavity 200, the shell of main cavity 100 and special-purpose wiring cavity 200 all adopts the wall thickness high-quality steel plate of 10mm at least, and wall also is provided with reinforcement in the chamber of each cavity.
Said main cavity 100 set inside have high pressure soft starting controller 300, being connected through being arranged at the cable that is provided with in flame-proof type binding post 400 and the special-purpose wiring cavity on the main cavity sidewall into and out of line of said high pressure soft starting controller 300; Form two spaces that isolate relatively through sealing ring between said main cavity 100 and the special-purpose wiring cavity 200.
The rear and front end of said main cavity 100 is provided with thickening type flange 110, and the outer surface of said flange is provided with an end cap 120 respectively, is provided with sealing gasket 130 between said end cap 120 and the flange 110; The right side of said main cavity 100 be provided with one electric controling element is installed flame proof door 140, between said electric controling element and the flame proof door 140 through the sealing gasket sealing, between said flame proof door 140 and the main cavity 100 also through the sealing gasket sealing.
The chamber wall of the lower end of said special-purpose wiring cavity 200 be provided with and special-purpose wiring cavity between the cable interface that seals; The cable that is connected with the flame-proof type binding post in the said special-purpose wire connection cavity passes this cable interface and is connected with motor with extraneous high-voltage fence, seals through seal nipple 210 between said cable and the said cable interface.
Above main cavity 100, special-purpose wiring cavity 200 under the effect of each sealing ring and sealing gasket and external environment isolate mutually, therefore be independent of each other; When main cavity 100 or special-purpose wiring cavity 200 inside flammable mixtures occurs and blast; Can not cause damage because of the chamber wall is very thick; Thereby the heat that blast produces can be not excessive to extraneous yet, thereby avoid high-risk occasions such as colliery, oil, chemical industry that corresponding chain explosion takes place.Therefore, the utlity model has good explosion-proof effect, can adapt to high-risk site surrounding requirements such as colliery, oil, chemical industry.The encapsulating method that can not change the shell explosion insulation performance has been adopted in the introducing of cable or wire, can guarantee the sealing property of explosion-proof type high pressure soft starting controller, and prevents that effectively cable receives dilatory or reverses and damage.
Referring to Fig. 4; The high pressure soft starting controller; It comprises major loop ZHL and control loop KZHL and isolating transformer 4; The high-pressure side 401 of motor (M) 7 and isolating transformer 4 is connected among the major loop ZHL, and the low-pressure side 402 of isolating transformer 4 is connected among the control loop KZHL, and major loop ZHL connects three phase mains 1 through high pressure incoming relay-protection circuit breaker 2; Between the high-pressure side 401 of high pressure incoming relay-protection circuit breaker 2 and isolating transformer 4, also be in series with starting contactor 3, and be parallel with an operation contactor 8 on the series arm that constitutes with starting contactor 3 in the high-pressure side of isolating transformer 4 401; Control loop KZHL comprises thyristor groups 5 and control unit 6; Thyristor groups 5 is connected with the low-pressure side 402 of isolating transformer 4; Thyristor groups 5 trigger electrodes connect control unit 6; The signal input part of control unit 6 obtains synchronizing signal through a PT 9 from major loop ZHL, the signal input part of control unit 6 obtains the feedback signal of motor from major loop ZHL through two CT 10.
In the present embodiment, the primary voltage of three phase mains 1 is 6 kilovolts of 50 hertz of power supplys of 3 phases.Like above-mentioned structure shown in Figure 4, it is through operation contactor 8 that three-phase alternating current 6KV 50HZ power supply 1 has two passes can reach 7, one on motor (M), and the passage that three phase mains 1 is delivered to motor (M) 7 is normal operation passage; Through starting contactor 3 and isolating transformer 4, the passage that three phase mains 1 is delivered to motor (M) 7 is the controlled current system passage of isolating transformer 4.Obviously the high-pressure side 401 of major loop ZHL does not have the thyristor element, and several main device: operation contactor 8, starting contactor 3 and isolating transformer 4 as vacuum contactor spare all can operate among the control loop KZHL for a long time.Thyristor groups 5 is in the low-pressure side 402 of isolating transformer 4, and its voltage is 1/6 of high-pressure side 401.So the requirement of withstand voltage of thyristor groups 5 real works is no more than 2 kilovolts, adopt suitable thyristor can satisfy the demand fully.Like this, just needn't use a plurality of thyristor connection in series-parallel to use, also just avoid the frequent fault of being brought thus in 6 kilovolts of sides of major loop ZHL.Because thyristor groups 6 is operated in the low-pressure side 402 of isolating transformer 4, electric pressure is low, makes 6 thyristors can realize the control of three-phase alternating current, and its control technology is very ripe.
And the low-voltage signal that is controlled to be of thyristor is controlled, this just realizes control for microcomputer and provides convenience.And microcomputer technology is very ripe in the application of thyristor now, realize that sophisticated functions control is also very convenient, and control performance is also highly stable.So the utility model controller adopts the control of soft stable performance of isolating transformer, reliable operation, structure are more reasonable than before.
Many groups thyristor assembly before the high pressure soft starting controller of the utility model replaces with isolating transformer 4 in major loop ZHL uses general thyristor to implement effective control of soft start in the low-pressure side 402 of isolating transformer 4.
Referring to Fig. 5, comprise power supply 601 in the control unit 6, the pressurizer 602 that is connected with power supply 601, central processing unit 604, the display 603, trigger 605 and the switching value output device 607 that are connected with central processing unit 604 outputs.The analog to digital converter (A/D) 606 and the switching value entering apparatus 608 that are connected with central processing unit 604 inputs.In order to reach the better controlling effect, control unit 6 adopts microsystem, and its fast operation can reach 5,000,000 computings of per second.The analog to digital converter of selecting 606 is 14.Described switching value entering apparatus 608 comprises filter circuit and photoisolator.In the present embodiment, filter circuit is a rc filter circuit.Photoisolator adopts the TLP521 chip.Realization is isolated for the Filtering Processing and the photoelectricity of switching value.Switching value input has comprised/has stopped, parameter setting on turn over, turn over down and confirm.All above-mentioned signals all demonstrate on display 603.
Switching value output device 607 comprises triode and relay.In the present embodiment, relay adopts miniature relay.The contact of relay is used to control the peripheral circuit beyond the control loop, like the operation contactor of bypass etc.It drives the actuating of relay for the signal of control unit 6 outputs after triode drives, thereby reaches the purpose of control.All above-mentioned devices all are integrated in the control box, compact conformation, and advantages of small volume, multiple functional, shielding is effective, reliable operation.Like above-mentioned structure; During the starting beginning, starting contactor 3 adhesives among the control unit control control loop KZHL are connected major loop; Three phase mains 6KV inserts high-tension motor (M) 7 through the high-pressure side 401 of isolating transformer 4; Control unit 6 is operated in the low-pressure side 402 of isolating transformer 4, and the electric current of the low-pressure side 402 of isolating transformer 4 is controlled, and realizes the high voltage side current of isolating transformer 4 is controlled; Thereby make the electric current of motor (M) 7 controlled in starting process, reach the control purpose of soft start.When starting process is accomplished; Control unit 6 is connected through the operation contactor 8 of switching value output device 607 control bypasses; With starting contactor among the control loop KZHL 3 and isolating transformer 4 short circuits; Power supply is directly received on the high-tension motor (M) 7 through the operation contactor 8 of bypass, and after high-tension motor (M) 7 got into operate as normal, Soft Start-up Process finished.
Specifically, in starting process, central processing unit in the control loop in the control unit 6 604 removes to control the angle of flow of thyristor groups 5, the electric current of control isolating transformer 4 low-pressure sides 402 according to the starting current value that provides setting.Central processing unit 604 pairs of processes analog to digital converter (A/D) is treated to the needed Continuity signal of the thyristor angle of flow with the voltage of sampling, the digital signal that current signal converts to, controls through the angle of flow of 605 pairs of thyristors of trigger; Utilize the high-pressure side 401 and the proportional relation of low-pressure side 402 electric currents of isolating transformer 4, the electric current of thyristor conducting obtains corresponding starting current on major loop ZHL after isolating transformer 4 conversion; Rise dynamic control signal to and delayed time 0.5 second after, by starting the magnitude of current that set point removes to increase gradually the thyristor angle of flow, make the voltage of motor (M) 7 rise gradually.At this moment, the electric current of motor (M) 7 also can rise gradually, but the control of the starting current times of being set.The basic standard-sized sheet of the angle of flow and motor (M) 7 speed of treating three-phase alternating current are during also near specified speed, and motor (M) 7 electric currents can descend fast; This moment, control unit 6 mainly was the full conducting of the control angle of flow, and motor (M) 7 obtains total current, realizes the Current Control to isolating transformer 4 high-pressure sides 401; After the time-delay, central processing unit 604 control bypass operation contactors 8 are connected, and break off starting contactor 3 again.Signal after contactor switches is input in the central processing unit 604 the still whole conductings of retentive control thyristor through switching value entering apparatus 608.But oneself accomplishes Soft Start-up Process.Though the whole conductings of thyristor after this because 8 pairs of thyristor groups 5 of operation contactor have constituted short circuit, make three phase mains directly receive motor (M) 7 through bypass operation contactor 8.In fact thyristor 5 no currents pass through.Through said process, make the electric current of high-tension motor (M) 7 controlled in starting process, reach the control purpose of soft start.
For reaching the better controlling effect, in the present embodiment, it is PIC 1 6F877 chip that the central processing unit 604 in the control unit 6 adopts the CPU of microsystem, and its fast operation can reach 5,000,000 computings of per second.The realization of concrete control is provided with corresponding parameters as required by the central processing unit 604 of control unit 6; Comprise the start mode selection; The starting setting-up time, the proportionality coefficient of speed and electric current, integral coefficient, differential coefficient, and starting current times selection, the setting of motor rated current etc.If speed sensor then can select speed ring to participate in control; Like Speedless sensor, then can remove the control of speed ring.Simply also can remove the control of electric current loop if require.Start mode has multiple combination to cooperate to satisfy the use needs of motor.Whole process receives the influence of starting setting-up time and starting current times restriction.Because the parameter of corresponding control all can be revised adjustment, so starting control is flexible.Can realize smooth start, rush of current is little, and the i-v curve of starting process also can be controlled effectively.
More than show and described the advantage of basic principle, principal character and the utility model of the utility model.The technical staff of the industry should understand; The utility model is not restricted to the described embodiments; The just principle of describing in the foregoing description and the specification of the utility model; The utility model also has various changes and modifications under the prerequisite that does not break away from the utility model spirit and scope, and these variations and improvement all fall in the scope of the utility model that requires protection.The protection range that the utility model requires is defined by appending claims and equivalent thereof.
Claims (5)
1. isolated explosion-proof type high pressure soft starting controller; Comprise main cavity and special-purpose wiring cavity; It is characterized in that; Said main cavity set inside has the high pressure soft starting controller, being connected through being arranged at the cable that is provided with in flame-proof type binding post and the special-purpose wiring cavity on the main cavity sidewall into and out of line of said high pressure soft starting controller; Form two spaces that isolate relatively through sealing ring between said main cavity and the special-purpose wiring cavity;
The chamber wall thickness of said main cavity and special-purpose wiring cavity is 10mm at least, and wall also is provided with reinforcement in the chamber of each cavity;
The rear and front end of said main cavity is provided with the thickening type flange, and the outer surface of said flange is provided with an end cap respectively, is provided with sealing gasket between said end cap and the flange; The right side of said main cavity be provided with one electric controling element is installed the flame proof door, between said electric controling element and the flame proof door through the sealing gasket sealing, between said flame proof door and the main cavity also through the sealing gasket sealing;
The chamber wall of the lower end of said special-purpose wiring cavity be provided with and special-purpose wiring cavity between the cable interface that seals; The cable that is connected with the flame-proof type binding post in the said special-purpose wire connection cavity passes this cable interface and is connected with motor with extraneous high-voltage fence, seals through seal nipple between said cable and the said cable interface.
2. isolated explosion-proof type high pressure soft starting controller according to claim 1; It is characterized in that; Said high pressure soft starting controller comprises major loop and control loop and isolating transformer; The high-pressure side of said motor and isolating transformer is connected in the major loop, and the low-pressure side of isolating transformer is connected in the control loop, and said major loop connects three phase mains through high pressure incoming relay-protection circuit breaker; Between the high-pressure side of high pressure incoming relay-protection circuit breaker and isolating transformer, also be in series with starting contactor, and on the series arm that the high-pressure side of isolating transformer and starting contactor constitute, be parallel with an operation contactor; Said control loop comprises thyristor groups and control unit, and said thyristor groups is connected with the low-pressure side of said isolating transformer, and the thyristor groups trigger electrode connects control unit, and the signal input part of control unit obtains synchronizing signal through a PT from major loop.
3. isolated explosion-proof type high pressure soft starting controller according to claim 2; It is characterized in that; Comprise the power supply of being with pressurizer in the described control unit that is connected on the thyristor groups trigger electrode; Central processing unit, the display that is connected with the central processing unit output, trigger and switching value output device, analog to digital converter that is connected with the central processing unit input and switching value entering apparatus.
4. isolated explosion-proof type high pressure soft starting controller according to claim 3 is characterized in that described switching value entering apparatus comprises filter circuit and photoisolator.
5. isolated explosion-proof type high pressure soft starting controller according to claim 3 is characterized in that described switching value output device comprises triode and relay.
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| Application Number | Priority Date | Filing Date | Title |
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| CN2011203185482U CN202190233U (en) | 2011-08-29 | 2011-08-29 | Isolated type explosion-proof high voltage soft start controller |
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| Application Number | Priority Date | Filing Date | Title |
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| CN2011203185482U CN202190233U (en) | 2011-08-29 | 2011-08-29 | Isolated type explosion-proof high voltage soft start controller |
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Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN103066895A (en) * | 2012-12-30 | 2013-04-24 | 青岛天信电气有限公司 | Anti-explosion soft-starting synchronous seamless switching technology for mines |
| CN108345255A (en) * | 2018-04-20 | 2018-07-31 | 博太科防爆设备（上海）有限公司 | A kind of explosion hazard area electric tracing explosion-proof intelligent controller |
-
2011
- 2011-08-29 CN CN2011203185482U patent/CN202190233U/en not_active Expired - Fee Related
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN103066895A (en) * | 2012-12-30 | 2013-04-24 | 青岛天信电气有限公司 | Anti-explosion soft-starting synchronous seamless switching technology for mines |
| CN108345255A (en) * | 2018-04-20 | 2018-07-31 | 博太科防爆设备（上海）有限公司 | A kind of explosion hazard area electric tracing explosion-proof intelligent controller |
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| 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: 20120411 Termination date: 20180829 |