CN113707498B - Safety protection device of high-voltage direct-current relay based on photovoltaic power generation - Google Patents
Safety protection device of high-voltage direct-current relay based on photovoltaic power generation Download PDFInfo
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- CN113707498B CN113707498B CN202111022440.3A CN202111022440A CN113707498B CN 113707498 B CN113707498 B CN 113707498B CN 202111022440 A CN202111022440 A CN 202111022440A CN 113707498 B CN113707498 B CN 113707498B
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- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01H—ELECTRIC SWITCHES; RELAYS; SELECTORS; EMERGENCY PROTECTIVE DEVICES
- H01H50/00—Details of electromagnetic relays
- H01H50/12—Ventilating; Cooling; Heating
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- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01H—ELECTRIC SWITCHES; RELAYS; SELECTORS; EMERGENCY PROTECTIVE DEVICES
- H01H50/00—Details of electromagnetic relays
- H01H50/02—Bases; Casings; Covers
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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
- Y02E10/00—Energy generation through renewable energy sources
- Y02E10/50—Photovoltaic [PV] energy
- Y02E10/56—Power conversion systems, e.g. maximum power point trackers
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- Electromagnetism (AREA)
- Emergency Protection Circuit Devices (AREA)
Abstract
The invention discloses a safety protection device of a high-voltage direct-current relay based on photovoltaic power generation, and relates to the technical field of high-voltage direct-current relays. The invention comprises a high-voltage direct-current relay body; the high-voltage direct-current relay body is arranged in an explosion-proof box; the upper part of the high-voltage direct-current relay body is provided with a pair of terminals which are vertically arranged; the terminal is arranged on the top wall of the explosion-proof box in a penetrating way; a plurality of vent holes are uniformly distributed on the bottom wall of the explosion-proof box; a three-dimensional cooling component is arranged on the periphery of the high-voltage direct-current relay body. According to the invention, the peripheral side wall of the high-voltage direct-current relay body is subjected to three-dimensional cooling through the three-dimensional cooling component, so that the surface temperature of the high-voltage direct-current relay can be effectively reduced, and the problems of explosion and the like caused by overhigh heat of the traditional high-voltage direct-current relay are greatly reduced, and the high-voltage direct-current relay has high market application value.
Description
Technical Field
The invention belongs to the technical field of high-voltage direct-current relays, and particularly relates to a safety protection device of a high-voltage direct-current relay based on photovoltaic power generation.
Background
The high-voltage direct-current relay is an electric appliance which enables a controlled quantity to generate a preset step change in an electric output circuit when the change of the input quantity (excitation quantity) of a high-voltage circuit meets the specified requirement, and can be applied to the fields of rail transit, new energy automobiles, battery packs, new energy charging piles, photovoltaics, UPS power supplies, military and the like.
In the prior art, a high-voltage direct current relay applied to photovoltaic power generation is usually directly arranged in a control box of the photovoltaic power generation, and in practical application, the surface of the high-voltage direct current relay generates heat when the high-voltage direct current relay works, if the surface heat is not timely emitted, the problems of explosion and the like caused by overhigh heat can be caused; moreover, due to the lack of effective protection, other equipment is easy to cause after the high-voltage direct-current relay is in question. Therefore, a safety protection device of a high-voltage direct-current relay based on photovoltaic power generation needs to be studied so as to solve the problems.
Disclosure of Invention
The invention provides a safety protection device of a high-voltage direct current relay based on photovoltaic power generation, and aims to solve the technical problems that the high-voltage direct current relay in the prior art is exploded due to overhigh heat and the like.
In order to solve the technical problems, the invention is realized by the following technical scheme:
the invention relates to a safety protection device of a high-voltage direct-current relay based on photovoltaic power generation, which comprises a high-voltage direct-current relay body; the high-voltage direct-current relay body is arranged in an explosion-proof box; the upper part of the high-voltage direct-current relay body is provided with a pair of vertically arranged terminals; the terminals are arranged on the top wall of the explosion-proof box in a penetrating manner; a plurality of vent holes are uniformly distributed on the bottom wall of the explosion-proof box; the periphery of the high-voltage direct-current relay body is provided with a three-dimensional cooling component; the three-dimensional cooling component is used for three-dimensionally cooling the peripheral side wall of the high-voltage direct-current relay body.
Further, the three-dimensional cooling component comprises a serpentine coil sleeved on the periphery of the high-voltage direct-current relay body; the outer wall of the serpentine coil pipe is attached to the outer wall of the high-voltage direct-current relay body; the serpentine coil is connected with a cold supply module; the cooling module is used for cooling the serpentine coil; a constraint ring is arranged on the periphery of the serpentine coil; the constraint ring is used for fixing the serpentine coil on the periphery of the high-voltage direct-current relay body.
Further, a flame-retardant component is arranged on the periphery of the three-dimensional cooling component; the flame-retardant component is used for releasing flame-retardant gas into the explosion-proof box; the flame retardant assembly comprises an annular air bag arranged at the periphery of the serpentine coil; the annular air bag is connected with the inner side wall of the explosion-proof box through a plurality of supporting seats; the inner side surface of the annular air bag is provided with a plurality of air outlets; a sealing piece is stuck at the inner end of the air outlet; a guide pin perpendicular to the sealing piece is arranged at the outer port of the air outlet; one end of the guide pin is fixed on the outer side face of the constraint ring.
Further, a blocking component is arranged on the periphery of the flame retardant component; the blocking component is used for completely moving the high-voltage direct-current relay body into the explosion-proof box after the high-voltage direct-current relay body has a problem and cutting off the connection between the high-voltage direct-current relay body and other components; the blocking assembly comprises a pair of power telescopic rods which are respectively and vertically fixed on two opposite inner side walls of the explosion-proof box, and a pair of blocking frames which are horizontally arranged above the high-voltage direct-current relay body; the output end of the power telescopic rod is horizontally fixed with a bearing block; the bearing block is connected with the bottom of the high-voltage direct-current relay body through bolts; the blocking frame is of a U-shaped structure; the middle part of the blocking frame is provided with a cutter arranged between two terminals of the high-voltage direct-current relay body; two ends of the blocking frame are respectively connected with the inner side wall of the explosion-proof box through a first elastic telescopic rod; the length direction of the first elastic telescopic rod is perpendicular to the length direction of the cutter; one end of the first elastic telescopic rod, which is close to the cutter, is rotationally connected with a first transmission rod; the lower end of the first transmission rod is rotatably connected with a second transmission rod corresponding to the bearing block; the second transmission rod is vertically fixed on the upper surface of the bearing block.
Further, a shielding component is arranged between the high-voltage direct-current relay body and the bottom wall of the explosion-proof box; the shielding component is used for shielding the upper port of the vent hole; the shielding component comprises a plurality of supporting sheets which are arranged on the periphery of the annular air bag along the annular direction; one surface of the supporting sheet is attached to the outer surface of the annular air bag; the other surface of the supporting piece is connected with the inner side wall of the explosion-proof box through a second elastic telescopic rod; one end of the second elastic telescopic rod, which is close to the supporting piece, is rotatably connected with a third transmission rod; the lower end of the third transmission rod is rotationally connected with the upper end of a fourth transmission rod which is vertically arranged; the lower ends of the fourth transmission rods extend to the lower part of the explosion-proof box in a penetrating way and are connected through a shielding plate which is horizontally arranged; the shielding plate is used for shielding the lower port of the vent hole.
The invention has the following beneficial effects:
according to the invention, the peripheral side wall of the high-voltage direct-current relay body is subjected to three-dimensional cooling through the three-dimensional cooling component, so that the surface temperature of the high-voltage direct-current relay can be effectively reduced, and the problems of explosion and the like caused by overhigh heat of the traditional high-voltage direct-current relay are greatly reduced, and the high-voltage direct-current relay has high market application value.
Of course, it is not necessary for any one product to practice the invention to achieve all of the advantages set forth above at the same time.
Drawings
In order to more clearly illustrate the technical solutions of the embodiments of the present invention, the drawings that are needed for the description of the embodiments will be briefly described below, and it is obvious that the drawings in the following description are only some embodiments of the present invention, and that other drawings may be obtained according to these drawings without inventive effort for a person skilled in the art.
Fig. 1 is a schematic structural diagram of a safety protection device of a high-voltage direct-current relay based on photovoltaic power generation;
FIG. 2 is a front view of the structure of FIG. 1;
FIG. 3 is an enlarged view of the structure at A in FIG. 2;
FIG. 4 is a schematic structural view of a three-dimensional cooling module according to the present invention;
FIG. 5 is a schematic structural view of a flame retardant assembly of the present invention;
FIG. 6 is a schematic view of the structure of the barrier assembly of the present invention;
fig. 7 is a schematic structural view of a shielding assembly according to the present invention.
In the drawings, the list of components represented by the various numbers is as follows:
the high-voltage direct-current relay comprises a 1-high-voltage direct-current relay body, a 2-explosion-proof box, a 3-three-dimensional cooling component, a 4-flame-retardant component, a 5-blocking component, a 6-shielding component, a 201-vent hole, a 301-serpentine coil pipe, a 302-cold supply module, a 303-constraint ring, a 401-annular air bag, a 402-supporting seat, a 403-sealing piece, a 404-guide pin, a 501-power telescopic rod, a 502-blocking frame, a 5021-cutter, a 503-bearing block, a 504-first elastic telescopic rod, a 505-first transmission rod, a 506-second transmission rod, a 601-supporting piece, a 602-second elastic telescopic rod, a 603-third transmission rod, a 604-fourth transmission rod, a 605-shielding plate and a 4011-air outlet.
Detailed Description
The following description of the embodiments of the present invention will be made clearly and completely with reference to the accompanying drawings, in which it is apparent that the embodiments described are only some embodiments of the present invention, but not all embodiments. All other embodiments, which can be made by those skilled in the art based on the embodiments of the invention without making any inventive effort, are intended to be within the scope of the invention.
First embodiment:
referring to fig. 1-2, the invention relates to a safety protection device of a high-voltage direct-current relay based on photovoltaic power generation, which comprises a high-voltage direct-current relay body 1; the high-voltage direct-current relay body 1 is arranged in an explosion-proof box 2; the horizontal cross section of the explosion-proof box 2 is in a rectangular structure; the upper part of the high-voltage direct-current relay body 1 is provided with a pair of vertically arranged terminals; the terminals are arranged on the top wall of the explosion-proof box 2 in a penetrating way; the terminal is in sliding fit with the top wall of the explosion-proof box 2; a plurality of vent holes 201 are uniformly distributed on the bottom wall of the explosion-proof box 2; the periphery of the high-voltage direct-current relay body 1 is provided with a three-dimensional cooling component 3; the three-dimensional cooling component 3 is used for three-dimensional cooling of the peripheral side wall of the high-voltage direct-current relay body 1.
As shown in fig. 2 and fig. 4, the three-dimensional cooling component 3 includes a serpentine coil 301 sleeved on the periphery of the high-voltage direct-current relay body 1; the outer wall of the serpentine coil 301 is attached to the outer wall of the high-voltage direct-current relay body 1; the serpentine coil 301 is connected to a cooling module 302; the cooling module 302 is a conventional refrigeration device in the art, and belongs to the prior art; the cooling module 302 is used for cooling the serpentine coil 301; serpentine coil 301 has an inlet end and an outlet end; the outer periphery of the serpentine coil 301 is provided with a confinement ring 303; a confinement ring 303 is used to secure the serpentine coil 301 to the outer perimeter of the hvth relay body 1; the confinement rings 303 are made of a rubber material. When in use, the cooling module 302 inputs cooling liquid from the inlet end, and then flows through the inside of the serpentine coil 301 (realizing three-dimensional cooling of the peripheral side wall of the high-voltage direct-current relay body 1), and then flows back to the cooling module 302 through the outlet end (realizing cooling again).
Specific embodiment II:
the embodiment is further optimized based on the first embodiment, and specifically comprises the following steps:
as shown in fig. 2-4, a flame-retardant component 4 is arranged on the periphery of the three-dimensional cooling component 3; the flame-retardant component 4 is used for releasing flame-retardant gas into the explosion-proof box 2; the flame retardant assembly 4 comprises an annular bladder 401 disposed about the periphery of the serpentine coil 301; the annular air bag 401 stores flame-retardant gas therein; the flame retardant gas is inert gas; the annular air bag 401 is made of rubber; the annular air bag 401 is connected with the inner side wall of the explosion-proof box 2 through a plurality of supporting seats 402; the inner side surface of the annular air bag 401 is provided with a plurality of air outlets 4011 with circular structures; a sealing piece 403 is stuck at the inner end of the air outlet 4011; a guide pin 404 perpendicular to the sealing piece 403 is arranged at the outer port of the air outlet 4011; one end of the guide pin 404 is fixed to the outer side surface of the confinement ring 303. If the high-voltage direct current relay body 1 bursts due to heat concentration, the impact force generated by the burst will cause the constraint ring 303 to expand outwards, so that the other end of the guide pin 404 is inserted into the air outlet 4011 (the guide pin 404 is in clearance fit with the air outlet 4011) and pushes the sealing piece 403 to separate from the inner end of the air outlet 4011, thereby realizing that the flame-retardant gas in the annular air bag 401 is discharged from the air outlet 4011, greatly reducing the oxygen amount in the explosion-proof box 2, and realizing the purpose of preventing the high-voltage direct current relay body 1 from burning.
Third embodiment:
the second embodiment is further optimized based on the second embodiment, and specifically comprises the following steps:
as shown in fig. 2-3 and fig. 5-6, the outer periphery of the flame retardant component 4 is provided with a blocking component 5; the blocking component 5 is used for completely moving the high-voltage direct-current relay body 1 into the explosion-proof box 2 after the high-voltage direct-current relay body 1 has a problem and cutting off the connection between the high-voltage direct-current relay body 1 and other components; the blocking assembly 5 comprises a pair of power telescopic rods 501 which are respectively and vertically fixed on two opposite inner side walls of the explosion-proof box 2, and a pair of blocking frames 502 which are horizontally arranged above the high-voltage direct-current relay body 1; the power telescopic rod 501 adopts a conventional electric push rod in the field; the output end of the power telescopic rod 501 is horizontally fixed with a bearing block 503; the bearing block 503 is connected with the bottom of the high-voltage direct-current relay body 1 through bolts; the barrier frame 502 is in a U-shaped structure; the middle part of the blocking frame 502 is provided with a cutter 5021 arranged between two terminals of the high-voltage direct-current relay body 1; the upper surface of the cutter 5021 is attached to the top wall of the explosion-proof box 2; both ends of the blocking frame 502 are respectively connected with the inner side wall of the explosion-proof box 2 through a first elastic telescopic rod 504; the first elastic telescopic rod 504 is composed of a first rod sleeve, a first supporting rod which is inserted in the rod sleeve in a sliding way and a first spring which is arranged in the first rod sleeve (the first spring is used for connecting the first rod sleeve and the first supporting rod), and the first elastic telescopic rod is of a conventional design in the field; the length direction of the first elastic telescopic rod 504 is perpendicular to the length direction of the cutter 5021; a first transmission rod 505 is rotatably connected to one end of the first elastic telescopic rod 504, which is close to the cutter 5021; the lower end of the first transmission rod 505 is rotatably connected with a second transmission rod 506 corresponding to the bearing block 503; the second transmission rod 506 is vertically fixed to the upper surface of the bearing block 503. When the high-voltage direct current relay body 1 bursts due to heat concentration, the power telescopic rod 501 drives the high-voltage direct current relay body 1 to move downwards, the beam terminal of the high-voltage direct current relay body 1 is retracted into the explosion-proof box 2, meanwhile, the two blocking frames 502 are driven to do separation movement through the second transmission rod 506 and the first transmission rod 505, and the cutter 5021 cuts off connecting wires between the high-voltage direct current relay body 1 and other components, so that the situations that the other components are scrapped after the high-voltage direct current relay body 1 has a problem are avoided.
Fourth embodiment:
the third embodiment is further optimized based on the third embodiment, and specifically comprises the following steps:
as shown in fig. 2 and 7, a shielding component 6 is arranged between the high-voltage direct-current relay body 1 and the bottom wall of the explosion-proof box 2; the shielding component 6 is used for shielding the upper port of the vent 201; the shielding assembly 6 includes a plurality of support pieces 601 disposed on the outer circumference of the annular airbag 401 in an annular direction; one surface of the supporting sheet 601 is attached to the outer surface of the annular air bag 401; the other surface of the supporting sheet 601 is connected with the inner side wall of the explosion-proof box 2 through a second elastic telescopic rod 602; the second elastic telescopic rod 602 is composed of a second rod sleeve, a second supporting rod which is inserted in the rod sleeve in a sliding way and a second spring which is arranged in the second rod sleeve (the second spring is used for connecting the second rod sleeve and the second supporting rod), and the second elastic telescopic rod is of a conventional design in the field; one end of the second elastic telescopic rod 602, which is close to the supporting plate 601, is rotatably connected with a third transmission rod 603; the lower end of the third transmission rod 603 is rotatably connected with the upper end of a fourth transmission rod 604 which is vertically arranged; the lower ends of the fourth transmission rods 604 extend to the lower part of the explosion-proof box 2 in a penetrating way and are connected through a shielding plate 605 which is horizontally arranged; the fourth transmission rod 604 is in sliding fit with the bottom wall of the explosion-proof box 2; the shielding plate 605 serves to shield the lower port of the vent 201. When the flame retardant gas in the annular airbag 401 is discharged from the gas outlet 4011, the annular airbag 401 is shrunken, the supporting plate 601 moves towards the annular airbag 401 under the elastic action of the second elastic telescopic rod 602, and the shielding plate 605 is pulled upwards through the third transmission rod 603 and the fourth transmission rod 604, so that the lower port of the vent hole 201 is shielded, the inside of the explosion-proof box 2 is guaranteed to be in a closed state, and larger accidents caused by the occurrence of problems of the high-voltage direct current relay body 1 are avoided.
The preferred embodiments of the invention disclosed above are intended only to assist in the explanation of the invention. The preferred embodiments are not exhaustive or to limit the invention to the precise form disclosed. Obviously, many modifications and variations are possible in light of the above teaching. The embodiments were chosen and described in order to best explain the principles of the invention and the practical application, to thereby enable others skilled in the art to best understand and utilize the invention. The invention is limited only by the claims and the full scope and equivalents thereof.
Claims (5)
1. The safety protection device of the high-voltage direct current relay based on photovoltaic power generation comprises a high-voltage direct current relay body (1); the method is characterized in that:
the high-voltage direct-current relay body (1) is arranged in an explosion-proof box (2); the upper part of the high-voltage direct-current relay body (1) is provided with a pair of terminals which are vertically arranged; the terminals are arranged on the top wall of the explosion-proof box (2) in a penetrating way; a plurality of vent holes (201) are uniformly distributed on the bottom wall of the explosion-proof box (2); the periphery of the high-voltage direct-current relay body (1) is provided with a three-dimensional cooling component (3); the three-dimensional cooling component (3) is used for three-dimensionally cooling the peripheral side wall of the high-voltage direct-current relay body (1);
the three-dimensional cooling component (3) comprises a serpentine coil (301) sleeved on the periphery of the high-voltage direct-current relay body (1); the outer wall of the serpentine coil (301) is attached to the outer wall of the high-voltage direct-current relay body (1); the serpentine coil (301) is connected with a cooling module (302); the cooling module (302) is used for cooling the serpentine coil (301); a constraint ring (303) is arranged on the periphery of the serpentine coil (301); the constraint ring (303) is used for fixing the serpentine coil (301) on the periphery of the high-voltage direct-current relay body (1);
the periphery of the three-dimensional cooling component (3) is provided with a flame-retardant component (4); the flame-retardant component (4) is used for releasing flame-retardant gas into the explosion-proof box (2); the flame retardant assembly (4) comprises an annular air bag (401) arranged at the periphery of the serpentine coil (301); the annular air bag (401) is connected with the inner side wall of the explosion-proof box (2) through a plurality of supporting seats (402); the inner side surface of the annular air bag (401) is provided with a plurality of air outlets (4011); a sealing sheet (403) is stuck at the inner end of the air outlet (4011); a guide pin (404) perpendicular to the sealing piece (403) is arranged at the outer port of the air outlet (4011); one end of the guide pin (404) is fixed on the outer side surface of the constraint ring (303).
2. The safety protection device of the high-voltage direct-current relay based on the photovoltaic power generation according to claim 1, wherein a blocking component (5) is arranged on the periphery of the flame retardant component (4); the separation assembly (5) is used for completely moving the high-voltage direct-current relay body (1) into the explosion-proof box (2) after the high-voltage direct-current relay body (1) has a problem and cutting off the connection between the high-voltage direct-current relay body (1) and other components.
3. The safety protection device of the high-voltage direct current relay based on the photovoltaic power generation according to claim 2, wherein the blocking assembly (5) comprises a pair of power telescopic rods (501) which are vertically fixed on one opposite two inner side walls of the explosion-proof box (2) respectively and a pair of blocking frames (502) which are horizontally arranged above the high-voltage direct current relay body (1); the output end of the power telescopic rod (501) is horizontally fixed with a bearing block (503); the bearing block (503) is connected with the bottom of the high-voltage direct-current relay body (1) through bolts; the blocking frame (502) is of a U-shaped structure; the middle part of the blocking frame (502) is provided with a cutter (5021) arranged between two terminals of the high-voltage direct-current relay body (1); both ends of the blocking frame (502) are respectively connected with the inner side wall of the explosion-proof box (2) through a first elastic telescopic rod (504); the length direction of the first elastic telescopic rod (504) is perpendicular to the length direction of the cutter (5021); one end of the first elastic telescopic rod (504) close to the cutter (5021) is rotatably connected with a first transmission rod (505); the lower end of the first transmission rod (505) is rotatably connected with a second transmission rod (506) corresponding to the bearing block (503); the second transmission rod (506) is vertically fixed on the upper surface of the bearing block (503).
4. The safety protection device of the high-voltage direct-current relay based on the photovoltaic power generation according to claim 3, wherein a shielding component (6) is arranged between the high-voltage direct-current relay body (1) and the bottom wall of the explosion-proof box (2); the shielding component (6) is used for shielding the upper port of the vent hole (201).
5. The safety device of the photovoltaic power generation-based high-voltage direct-current relay according to claim 4, wherein the shielding assembly (6) comprises a plurality of supporting pieces (601) arranged on the periphery of the annular air bag (401) along the annular direction; one surface of the supporting sheet (601) is attached to the outer surface of the annular air bag (401); the other surface of the supporting sheet (601) is connected with the inner side wall of the explosion-proof box (2) through a second elastic telescopic rod (602); one end of the second elastic telescopic rod (602) close to the supporting sheet (601) is rotatably connected with a third transmission rod (603); the lower end of the third transmission rod (603) is rotationally connected with the upper end of a fourth transmission rod (604) which is vertically arranged; the lower ends of the fourth transmission rods (604) penetrate through and extend to the lower part of the explosion-proof box (2) and are connected through a shielding plate (605) which is horizontally arranged; the shielding plate (605) is used for shielding the lower port of the vent hole (201).
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202111022440.3A CN113707498B (en) | 2021-09-01 | 2021-09-01 | Safety protection device of high-voltage direct-current relay based on photovoltaic power generation |
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| Application Number | Priority Date | Filing Date | Title |
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| CN202111022440.3A CN113707498B (en) | 2021-09-01 | 2021-09-01 | Safety protection device of high-voltage direct-current relay based on photovoltaic power generation |
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| CN113707498B true CN113707498B (en) | 2023-08-11 |
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| CN109869724A (en) * | 2019-03-15 | 2019-06-11 | 北京中金泰达电液科技有限公司 | A kind of novel intelligent high-efficiency pyrolysis installation handling the organic wastes such as house refuse |
| CN111128605A (en) * | 2020-02-21 | 2020-05-08 | 上海瑞垒电子科技有限公司 | Glass packaging type high-voltage direct-current relay |
| CN212970526U (en) * | 2020-07-19 | 2021-04-13 | 无锡厚源电子科技有限公司 | Special explosion-proof power supply for relay protection |
| CN112356700A (en) * | 2020-11-10 | 2021-02-12 | 景海瑞 | New forms of energy fill electric pile with heat sink is collected to rainwater |
| CN112509786A (en) * | 2020-11-25 | 2021-03-16 | 江苏恒屹变压器股份有限公司 | Explosion-proof anti-solarization transformer convenient to dissipate heat |
| CN112786374A (en) * | 2021-02-07 | 2021-05-11 | 三友联众集团股份有限公司 | Automatic detection coil insulation type electromagnetic relay |
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