CN203039368U - Active electric power filter employing water cooling technology - Google Patents
Active electric power filter employing water cooling technology Download PDFInfo
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- CN203039368U CN203039368U CN2013200102580U CN201320010258U CN203039368U CN 203039368 U CN203039368 U CN 203039368U CN 2013200102580 U CN2013200102580 U CN 2013200102580U CN 201320010258 U CN201320010258 U CN 201320010258U CN 203039368 U CN203039368 U CN 203039368U
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- water
- cabinet
- cooling
- heat exchanger
- power filter
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- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02E—REDUCTION OF GREENHOUSE GAS [GHG] EMISSIONS, RELATED TO ENERGY GENERATION, TRANSMISSION OR DISTRIBUTION
- Y02E40/00—Technologies for an efficient electrical power generation, transmission or distribution
- Y02E40/20—Active power filtering [APF]
Abstract
The utility model refers to an active electric power filter employing water cooling technology, and the filter is characterized by comprising an element cabinet of the active electric power filter and a cooling cabinet connected with the element cabinet. And a power device IGBT, a resistor, a high frequency reactor, a water cooling plate, an element cabinet water-air heat exchanger and a water pump are arranged in the element cabinet, a cooling cabinet water-water heat exchanger or a cooling cabinet water-air heat exchanger is arranged in the cooling cabinet, the power device IGBT of the active electric power filter in the element cabinet and the resistor are fixed on the water cooling plate, heat exchange is carried out through contact between a substrate surface of the power device IGBT and the resistor and a surface of the water cooling plate, the water cooling plate and the element cabinet water-air heat exchanger are connected with the cooling cabinet water-water heat exchanger or the cooling cabinet water-air heat exchanger through the water pump, so that an enclosed water circulation cooling system including the water cooling plate, the element cabinet water-air heat exchanger and the cooling cabinet water-water heat exchanger or the cooling cabinet water-air heat exchanger is formed. The active electric power filter employing water cooling technology realizes explosion-proof design of the active electric power filter.
Description
Technical field
The utility model relates to a kind of Active Power Filter-APF, particularly discloses a kind of Active Power Filter-APF that adopts Water Cooling Technology, belongs to the power engineering field.
Background technology
Because the various non-linear electric loadings of using, as the increase with current transformer etc. of frequency converter, rectifying device, arc furnace, high voltage direct current transmission, problems such as the harmonic pollution of electrical network, power factor descend, voltage is asymmetric, power failure, voltage fluctuation and flickering are more and more outstanding.
China China Machine Press " harmonic wave suppresses and reactive power compensation " (ISBN 7-111-06298-1/TM.728) the 7th chapter has been introduced the Active Power Filter-APF that is used for the low-voltage power supply electrical network.Active Power Filter-APF is a kind of for the novel electric power electric device that dynamically suppresses harmonic wave, compensating reactive power, can harmonic wave and the idle of variation that big or small and frequency all change be compensated fast.Utilize power electronic equipment to produce corresponding harmonic current and inject the harmonic current that power supply grid is offset the nonlinear load generation, thereby stop harmonic current to flow into electrical network, avoid the line voltage distortion, as required, Active Power Filter-APF can also be realized no-power compensation function.
Referring to accompanying drawing 1, the typical case of existing Active Power Filter-APF uses winding diagram, is Active Power Filter-APF in the empty frame wherein.
Referring to accompanying drawing 2, the current waveform of each point.Ila is the load current waveform of A phase, because the effect of nonlinear load, load current waveform has distortion, contains harmonic components.Ifa is the A phase current waveform of Active Power Filter-APF output.Isa is for after compensating through Active Power Filter-APF, and grid side A is to current waveform, and is basic approaching sinusoidal wave.
Conventional Active Power Filter-APF electric pressure mostly is 380V, 690V.
Referring to accompanying drawing 3, Active Power Filter-APF mainly comprises the parts such as storage capacitor 4, radio-frequency rector, control circuit, soft-start circuit 2, fuse 1, high-frequency filter circuit 5, cabinet and cooling of IGBT inverter bridge 3, DC link.
Referring to accompanying drawing 4, because wherein IGBT 8, resistance 9 and radio-frequency rector 7 are heater element, for guaranteeing the device operate as normal, whole device needs heat radiation, traditional Active Power Filter-APF adopts the mode of forced air cooling, by blower fan 6, utilizes air to flow heat is taken to outside the cabinet.
Yet, under coal mine, there is the occasion of requirement of explosion proof at chemical industry scene etc., forces the radiating mode of air cooling to use.Because forced air cooling can cause the flammable explosive gas access to plant inside in the environment, causes the live components of device inside to isolate with environment, can not satisfy on-the-spot explosion-proof safety requirements.
Summary of the invention
The purpose of this utility model is to overcome the deficiencies in the prior art, and a kind of Active Power Filter-APF of realizing that internally charged element and environment flammable explosive gas are isolated fully is provided.Active Power Filter-APF of the present utility model adopts Water Cooling Technology, except can be applicable to explosion-proof occasion, also can be applicable to the more occasion of site environment dust or conductive particle, in the useful life of having improved Active Power Filter-APF, has reduced failure rate.
The utility model is achieved in that a kind of Active Power Filter-APF that adopts Water Cooling Technology, it is characterized in that: the element cabinet and the cooling cabinet that is connected with the element cabinet that comprise Active Power Filter-APF, power device IGBT, resistance, radio-frequency rector, cooled plate, the empty heat exchanger of element cabinet water and water pump are installed in the element cabinet, the empty heat exchanger of cooling cabinet water water heat exchanger or cooling cabinet water is installed in the cooling cabinet, power device IGBT and the resistance of the Active Power Filter-APF in the element cabinet are fixed on the cooled plate, real estate by power device IGBT and resistance contacts with the surface of cooled plate and carries out heat exchange, cooled plate is connected with cooling cabinet water water heat exchanger or the empty heat exchanger of cooling cabinet water through water pump again with the empty heat exchanger of element cabinet water, constitutes the empty heat exchanger of cooled plate and element cabinet water sky heat exchanger and cooling cabinet water water heat exchanger or cooling cabinet water and forms airtight hydrologic cycle cooling system.
Heat conducts to inner loop water in the described Active Power Filter-APF element cabinet, and the inner loop water after heating up utilizes outer circulation water heat to be taken away or by the empty heat exchanger of cooling cabinet water heat is diffused in the extraneous air by cooling cabinet water water heat exchanger.
Described Active Power Filter-APF cooling cabinet is provided with explosion-proof form or non-explosion-proof form, and the cooling cabinet of explosion-proof form is positioned over the hazardous area and uses, and the cooling cabinet of non-explosion-proof form is positioned over the place of safety and uses.
Radio-frequency rector in the described element cabinet adopts water cooling reactor or air-cooled reactor.
The Active Power Filter-APF that the utility model adopts Water Cooling Technology with power device IGBT, resistance, radio-frequency rector, water pump, cooled plate, the empty heat exchanger of element cabinet water install with a cabinet in, called after element cabinet is installed on called after cooling cabinet in the cabinet with cooling cabinet water water heat exchanger or the empty heat exchanger of cooling cabinet water.
Because the element cabinet of Active Power Filter-APF contains electric component, when being applied to the hazardous area, need explosion-proof design, Development of Full-closed Water-cooling System of the present utility model provides the foundation for realizing the explosion-proof design of element cabinet.Heat exchanger form in the described cooling cabinet is divided into cooling cabinet water water heat exchanger or the empty heat exchanger of cooling cabinet water, and the two selects one to get final product during use.When described cooling cabinet is installed cooling cabinet water sky heat exchanger, inner loop water carries out heat exchange by the empty heat exchanger of cooling cabinet water and extraneous air, and blower ventilation need be set, and the blower fan of ventilation is elected the explosion-proof type blower fan as, the cooling cabinet of this scheme is designed to explosion-proof form, is positioned over the hazardous area and uses; If when the ventilation blower fan was elected non-explosion-proof type blower fan as, cooling cabinet was designed to non-explosion-proof type, is positioned over the place of safety and uses.
The beneficial effects of the utility model are: the heat that the electric component of the utility model Active Power Filter-APF produces conducts to inner loop water, the empty heat exchanger of water or cooling cabinet water water heat exchanger carry out heat exchange in inner loop water and the cooling cabinet, thereby the heat of inner loop water is conducted to the external refrigeration medium, reach the effect that reduces the inner loop coolant-temperature gage, satisfied the requirement of stable operation, realize the explosion-proof design of Active Power Filter-APF, solved the problem that the internally charged element of Active Power Filter-APF and environment flammable explosive gas are isolated fully.
Description of drawings
Fig. 1 is that the typical case of existing Active Power Filter-APF uses winding diagram.
Fig. 2 is existing Active Power Filter-APF compensation effect oscillogram.
Fig. 3 is existing Active Power Filter-APF electrical structure diagram.
Fig. 4 is existing Active Power Filter-APF heat sink conception structural representation.
Fig. 5 is the heat exchange workflow schematic diagram that the utility model adopts cooling cabinet water water heat exchanger.
Fig. 6 is the structural representation that the utility model adopts cooling cabinet water water heat exchanger.
Fig. 7 is the heat exchange workflow schematic diagram that the utility model adopts the empty heat exchanger of cooling cabinet water.
Fig. 8 is the structural representation that the utility model adopts the empty heat exchanger of cooling cabinet water.
Fig. 9 is the heat exchange workflow schematic diagram that element cabinet of the present utility model adopts water cooling reactor.
Figure 10 is the structural representation that element cabinet of the present utility model adopts water cooling reactor.
In the drawings: 1, fuse; 2, soft-start circuit; 3, IGBT inverter bridge; 4, storage capacitor; 5, high-frequency filter circuit; 6, blower fan; 7, radio-frequency rector; 8, power device IGBT; 9, resistance; 10, water pump; 11, cooled plate; 12, the empty heat exchanger of element cabinet water; 13, cooling cabinet water water heat exchanger; 14, element cabinet; 15, cooling cabinet; 16, the empty heat exchanger of cooling cabinet water; 17, water cooling reactor; 18, water pipe.
Embodiment
With reference to the accompanying drawings 5～8, a kind of Active Power Filter-APF that adopts Water Cooling Technology of the utility model, the element cabinet 14 and the cooling cabinet 15 that is connected with the element cabinet that comprise Active Power Filter-APF, power device IGBT 8, resistance 9, radio-frequency rector 7, cooled plate 11, the empty heat exchanger 12 of element cabinet water and water pump 10 are installed in the element cabinet 14, the empty heat exchanger 16 of cooling cabinet water water heat exchanger 13 or cooling cabinet water is installed in the cooling cabinet 15, power device IGBT 8 and the resistance 9 of the Active Power Filter-APF in the element cabinet 14 are fixed on the cooled plate 11, real estate by power device IGBT 8 and resistance 9 contacts with the surface of cooled plate 11 and carries out heat exchange, cooled plate 11 is connected with cooling cabinet water water heat exchanger 13 or the empty heat exchanger 16 of cooling cabinet water through water pump 10 again with the empty heat exchanger 12 of element cabinet water, constitutes the airtight hydrologic cycle cooling system that the empty heat exchanger 12 of cooled plate 11 and element cabinet water and cooling cabinet water water heat exchanger 13 or the empty heat exchanger 16 of cooling cabinet water are formed.
Embodiment 1:
With reference to the accompanying drawings 5, the water pump 10 of closed hydrologic cycle cooling system of the present utility model conducts to the heat of power device IGBT 8 and resistance 9 in the water of cooled plate 11 inside, the air heat conducts in the water of the empty heat exchanger 12 of element cabinet water in the element cabinet, the current direction water pump 10 of the empty heat exchanger 12 of the water of cooled plate 11 inside and element cabinet water, water pump 10 pressurizations make water be circulated to cooling cabinet water water heat exchanger 13, cooling cabinet water water heat exchanger 13 carries out heat exchange with the convection current of external refrigeration medium, continue to be circulated to cooled plate 11 and the empty heat exchanger 12 of element cabinet water, cooling power device IGBT 8 through the cooled water of heat exchange, resistance 9 and other heating electric components.The enforcement that closed circulating water methods for cooling of the present utility model is explosion-proof design provides the foundation.
With reference to the accompanying drawings 6, power device IGBT 8, resistance 9, water pump 10, cooled plate 11, the empty heat exchanger 12 of element cabinet water, radio-frequency rector 7 are installed in the element cabinet 14 in the utility model.Element cabinet 14 is designed to explosion-proof form, and cooling cabinet water water heat exchanger 13 is installed in the cooling cabinet 15, and cooling cabinet 15 is designed to explosion-proof form.Element cabinet 14 and the cooling cabinet 15 of this scheme are explosion-proof form, can be positioned over the hazardous area and use.Be designed to non-explosion-proof form as cooling cabinet 15, and element cabinet 14 is explosion-proof design, then element cabinet 14 can be positioned over the hazardous area use, and cooling cabinet 15 is positioned over the place of safety and uses.
The heat of power device IGBT 8 and resistance 9 conducts in the inner loop water of cooled plate 11, the heat of radio-frequency rector 7 is distributed in the element cabinet 14, the air heat of element cabinet 14 conducts in the inner loop water of the empty heat exchanger 12 of element cabinet water, the inner loop current direction water pump 10 of the empty heat exchanger 12 of the inner loop water of cooled plate 11 and element cabinet water, making inner loop water flow to cooling cabinet water water heat exchanger 13 through water pump 10 pressurizations is connected with the external refrigeration medium by water pipe 18, carry out heat exchange, thereby the heat of inner loop water is conducted to the external refrigeration medium, reach the effect that reduces the inner loop coolant-temperature gage, make the requirement of Active Power Filter-APF satisfied temperature operation.Cooling cabinet water water heat exchanger 13 no electric components are installed in the cooling cabinet 15, and cooling cabinet 15 is designed to explosion-proof form, can be positioned over the hazardous area with element cabinet 14 and use.Be designed to non-explosion-proof form as cooling cabinet 15, need that then cooling cabinet 15 is positioned over the place of safety and use, water lines is connected to the water lines inlet and outlet connectors of the element cabinet 14 in hazardous area from the place of safety, realize the water route circulation, reach the heat radiation purpose.
Embodiment 2:
According to Fig. 7, the utility model is formed the closed hydrologic cycle cooling system by water pump 10, cooled plate 11, the empty heat exchanger 12 of element cabinet water, the empty heat exchanger 16 of cooling cabinet water.The water pump 10 of closed hydrologic cycle cooling system conducts to the heat of power device IGBT 8 and resistance 9 in the water of cooled plate 11 inside, the air heat conducts in the water of the empty heat exchanger 12 of element cabinet water in the cabinet, the current direction water pump 10 of the empty heat exchanger 12 of the water of cooled plate 11 inside and element cabinet water, water pump 10 pressurizations make water be circulated to the empty heat exchanger 16 of cooling cabinet water, the empty heat exchanger 16 of cooling cabinet water carries out heat exchange with the convection current of external refrigeration medium, continue to be circulated to cooled plate 11 and the empty heat exchanger 12 of element cabinet water, cooling power device IGBT 8 through the cooled water of heat exchange, resistance 9 and other heating electric components.
With reference to the accompanying drawings 8, power device IGBT 8, resistance 9, water pump 10, cooled plate 11, the empty heat exchanger 12 of element cabinet water, radio-frequency rector 7 are installed in the element cabinet 14 in the present embodiment, and element cabinet 14 is designed to explosion-proof form.The empty heat exchanger 16 of cooling cabinet water is installed in the cooling cabinet 15, and the blower fan of the empty heat exchanger 16 of cooling cabinet water adopts the explosion-proof type blower fan, and cooling cabinet 15 is designed to explosion-proof form among this embodiment, can be positioned over the hazardous area with element cabinet 14 and use.When adopting non-explosion-proof type blower fan as the blower fan of the empty interchanger 16 of cooling cabinet water, cooling cabinet 15 is designed to non-explosion-proof form, is positioned over the place of safety and uses.And element cabinet 14 still is explosion-proof design, can be positioned over the hazardous area and use.
The heat of power device IGBT 8 and resistance 9 conducts in the inner loop water of cooled plate 11, the heat of radio-frequency rector 7 is distributed in the element cabinet 14, the air heat of element cabinet 14 conducts in the inner loop water of the empty heat exchanger 12 of element cabinet water, the inner loop current direction water pump 10 of the empty heat exchanger 12 of the inner loop water of cooled plate 11 and element cabinet water, make inner loop water flow to the empty heat exchanger 16 of cooling cabinet water through water pump 10 pressurizations and carry out heat exchange with the external refrigeration medium, thereby the heat of inner loop water is conducted to the external refrigeration medium, reach the effect that reduces the inner loop coolant-temperature gage, make the requirement of described Active Power Filter-APF satisfied temperature operation.The empty heat exchanger 16 of cooling cabinet water contains cooling fan, and cooling fan can adopt explosion-proof form to be installed in the cooling cabinet 15, and cooling cabinet 15 is designed to explosion-proof form, can be positioned over the hazardous area with element cabinet 14 and use.When cooling fan adopts non-explosion-proof form, cooling cabinet 15 is designed to non-explosion-proof form, cooling cabinet 15 is positioned over the place of safety to be used, water lines is connected to the water lines inlet and outlet connectors of hazardous area element cabinet 14 from the place of safety, the circulation of realization water route, make cooling fan and extraneous air carry out heat exchange, reach the heat radiation purpose.
Embodiment 3:
With reference to the accompanying drawings 9, the utility model comprises that water pump 10, cooled plate 11, the empty heat exchanger 12 of element cabinet water and water cooling reactor 17 form the element cabinet of closed hydrologic cycle cooling systems.The water pump 10 of closed hydrologic cycle cooling system conducts to the heat of power device IGBT 8 and resistance 9 in the water of cooled plate 11 inside, water cooling reactor 17 conducts to heat in the inner loop water, the air heat conducts in the water of the empty heat exchanger 12 of element cabinet water in the element cabinet, the water of cooled plate 11 inside, current direction water pump 10 in the empty heat exchanger 12 of element cabinet water and the water cooling reactor 17, water pump 10 pressurization makes water be circulated to external cooler to dispel the heat, continue to be circulated to cooled plate 11 through the cooled water of heat radiation, the empty heat exchanger 12 of element cabinet water and water cooling reactor 17, cooling power device IGBT 8, resistance 9, water cooling reactor 17 and other heating electric components.
With reference to the accompanying drawings 10, power device IGBT 8, resistance 9, water pump 10, cooled plate 11, the empty heat exchanger 12 of element cabinet water, water cooling reactor 17 are installed in the element cabinet 14 in the present embodiment, element cabinet 14 is designed to explosion-proof form, can be positioned over the supporting use of cooling cabinet among hazardous area and embodiment 1, the embodiment 2.
The heat of power device IGBT 8 and resistance 9 conducts in the inner loop water of cooled plate 11, the heat of water cooling reactor 17 conducts in the inner loop water, the air heat of element cabinet 14 conducts in the inner loop water of the empty heat exchanger 12 of element cabinet water, inner loop flows to water pump 10, through water pump 10 pressurization inner loop water is flow in the cooling cabinet of outer setting and carry out heat exchange with the external refrigeration medium, reach the effect that reduces the inner loop coolant-temperature gage, make the requirement of Active Power Filter-APF satisfied temperature operation.
When element cabinet 14 adopts water cooling reactor 17, the heat that distributes in its cabinet decreases, the empty heat exchanger 12 of element cabinet water is according to element cabinet internal heat generation situation, dispose as option, when the heat that distributes in the element cabinet is high, the empty heat exchanger 12 of configuration element cabinet water when the heat that distributes in the element cabinet hangs down, can be cancelled the setting of the empty heat exchanger 12 of element cabinet water.
The utility model is in above-mentioned heat transfer process, the internally charged element of Active Power Filter-APF is all less than contacting with material in the environment of hazardous area, realize the explosion-proof design of Active Power Filter-APF, solved the problem that the internally charged element of Active Power Filter-APF and environment flammable explosive gas can not be isolated fully.
Claims (6)
1. Active Power Filter-APF that adopts Water Cooling Technology, it is characterized in that: the element cabinet and the cooling cabinet that is connected with the element cabinet that comprise Active Power Filter-APF, power device IGBT, resistance, radio-frequency rector, cooled plate, the empty heat exchanger of element cabinet water and water pump are installed in the element cabinet, the empty heat exchanger of cooling cabinet water water heat exchanger or cooling cabinet water is installed in the cooling cabinet, power device IGBT and the resistance of the Active Power Filter-APF in the element cabinet are fixed on the cooled plate, real estate by power device IGBT and resistance contacts with the surface of cooled plate and carries out heat exchange, the empty heat exchanger of cooled plate and element cabinet water, be connected with cooling cabinet water water heat exchanger or the empty heat exchanger of cooling cabinet water by water pump, constitute the airtight hydrologic cycle cooling system that the empty heat exchanger of cooled plate and element cabinet water and cooling cabinet water water heat exchanger or the empty heat exchanger of cooling cabinet water are formed.
2. according to the Active Power Filter-APF of the described employing Water Cooling Technology of claim 1, it is characterized in that: the radio-frequency rector in the described element cabinet adopts water cooling reactor or air-cooled reactor.
3. the Active Power Filter-APF of employing Water Cooling Technology according to claim 1 is characterized in that: when the cooling cabinet of described Active Power Filter-APF adopted cooling cabinet water water heat exchanger, cooling cabinet was designed to explosion-proof form, and cooling cabinet is positioned over the hazardous area and uses.
4. the Active Power Filter-APF of employing Water Cooling Technology according to claim 1, it is characterized in that: when the cooling cabinet of described Active Power Filter-APF adopts cooling cabinet water water heat exchanger, cooling cabinet is designed to non-explosion-proof form, and cooling cabinet is positioned over the place of safety and uses.
5. the Active Power Filter-APF of employing Water Cooling Technology according to claim 1, it is characterized in that: the cooling cabinet of described Active Power Filter-APF adopts the empty heat exchanger of cooling cabinet water, when blower fan adopted explosion-proof type, cooling cabinet was designed to explosion-proof form, and cooling cabinet is positioned over the hazardous area and uses.
6. the Active Power Filter-APF of employing Water Cooling Technology according to claim 1, it is characterized in that: the cooling cabinet of described Active Power Filter-APF adopts the empty heat exchanger of cooling cabinet water, when blower fan adopted non-explosion-proof type, cooling cabinet was designed to non-explosion-proof form, and cooling cabinet is positioned over the place of safety and uses.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN2013200102580U CN203039368U (en) | 2013-01-09 | 2013-01-09 | Active electric power filter employing water cooling technology |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN2013200102580U CN203039368U (en) | 2013-01-09 | 2013-01-09 | Active electric power filter employing water cooling technology |
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| Publication Number | Publication Date |
|---|---|
| CN203039368U true CN203039368U (en) | 2013-07-03 |
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| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN2013200102580U Expired - Lifetime CN203039368U (en) | 2013-01-09 | 2013-01-09 | Active electric power filter employing water cooling technology |
Country Status (1)
| Country | Link |
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| CN (1) | CN203039368U (en) |
Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN103023034A (en) * | 2013-01-09 | 2013-04-03 | 张琦 | Active power filter with water cooling technology |
| CN106973553A (en) * | 2017-04-25 | 2017-07-21 | 北京无线电测量研究所 | A kind of pressure-oil tank with liquid cooling heat-exchanger |
| CN108966608A (en) * | 2018-09-07 | 2018-12-07 | 兖州东方机电有限公司 | A kind of composite radiating system for antiknock device in explosive gas atmosphere |
-
2013
- 2013-01-09 CN CN2013200102580U patent/CN203039368U/en not_active Expired - Lifetime
Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN103023034A (en) * | 2013-01-09 | 2013-04-03 | 张琦 | Active power filter with water cooling technology |
| CN106973553A (en) * | 2017-04-25 | 2017-07-21 | 北京无线电测量研究所 | A kind of pressure-oil tank with liquid cooling heat-exchanger |
| CN108966608A (en) * | 2018-09-07 | 2018-12-07 | 兖州东方机电有限公司 | A kind of composite radiating system for antiknock device in explosive gas atmosphere |
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Legal Events
| Date | Code | Title | Description |
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| C14 | Grant of patent or utility model | ||
| GR01 | Patent grant | ||
| C41 | Transfer of patent application or patent right or utility model | ||
| TR01 | Transfer of patent right |
Effective date of registration: 20160321 Address after: 201413 Shanghai City, Fengxian District is 1881 Lane 5 building Bolu Patentee after: SHANGHAI NENGCHUAN ELECTRIC CO.,LTD. Address before: 200125 Shanghai Road, Pudong New Area, Lane No. 1728, room 70, Lane 701 Patentee before: Zhang Qi |
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| CX01 | Expiry of patent term | ||
| CX01 | Expiry of patent term |
Granted publication date: 20130703 |