CN109801766A - A kind of stainless steel stepwise adjustable resistance and modulated brake resistance - Google Patents
A kind of stainless steel stepwise adjustable resistance and modulated brake resistance Download PDFInfo
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- CN109801766A CN109801766A CN201711135237.0A CN201711135237A CN109801766A CN 109801766 A CN109801766 A CN 109801766A CN 201711135237 A CN201711135237 A CN 201711135237A CN 109801766 A CN109801766 A CN 109801766A
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- insulating part
- stepwise adjustable
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- 239000010935 stainless steel Substances 0.000 title claims abstract description 47
- 229910001220 stainless steel Inorganic materials 0.000 title claims abstract description 47
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 claims abstract description 32
- RYGMFSIKBFXOCR-UHFFFAOYSA-N Copper Chemical compound [Cu] RYGMFSIKBFXOCR-UHFFFAOYSA-N 0.000 claims abstract description 23
- 229910052802 copper Inorganic materials 0.000 claims abstract description 23
- 239000010949 copper Substances 0.000 claims abstract description 23
- 230000005611 electricity Effects 0.000 claims abstract description 6
- 238000005452 bending Methods 0.000 claims description 20
- 238000009413 insulation Methods 0.000 claims description 16
- 239000012212 insulator Substances 0.000 claims description 11
- 239000000463 material Substances 0.000 claims description 10
- 239000000919 ceramic Substances 0.000 claims description 9
- 238000009434 installation Methods 0.000 claims description 8
- 230000003020 moisturizing effect Effects 0.000 claims description 5
- 238000007599 discharging Methods 0.000 claims description 4
- 238000003466 welding Methods 0.000 claims description 4
- 239000004593 Epoxy Substances 0.000 claims description 3
- 230000011218 segmentation Effects 0.000 claims description 3
- 125000000391 vinyl group Chemical group [H]C([*])=C([H])[H] 0.000 claims description 3
- 229920002554 vinyl polymer Polymers 0.000 claims description 3
- 238000010521 absorption reaction Methods 0.000 abstract description 4
- 230000015572 biosynthetic process Effects 0.000 abstract 1
- 238000006243 chemical reaction Methods 0.000 abstract 1
- 238000010586 diagram Methods 0.000 description 11
- 238000000034 method Methods 0.000 description 4
- 229910000831 Steel Inorganic materials 0.000 description 3
- 239000010959 steel Substances 0.000 description 3
- 229910045601 alloy Inorganic materials 0.000 description 2
- 239000000956 alloy Substances 0.000 description 2
- 238000005336 cracking Methods 0.000 description 2
- 230000000694 effects Effects 0.000 description 2
- 230000017525 heat dissipation Effects 0.000 description 2
- 238000013003 hot bending Methods 0.000 description 2
- JEIPFZHSYJVQDO-UHFFFAOYSA-N iron(III) oxide Inorganic materials O=[Fe]O[Fe]=O JEIPFZHSYJVQDO-UHFFFAOYSA-N 0.000 description 2
- HSFWRNGVRCDJHI-UHFFFAOYSA-N alpha-acetylene Natural products C#C HSFWRNGVRCDJHI-UHFFFAOYSA-N 0.000 description 1
- 238000004140 cleaning Methods 0.000 description 1
- 239000011248 coating agent Substances 0.000 description 1
- 238000000576 coating method Methods 0.000 description 1
- 238000001816 cooling Methods 0.000 description 1
- 230000018109 developmental process Effects 0.000 description 1
- 238000006073 displacement reaction Methods 0.000 description 1
- 125000002534 ethynyl group Chemical group [H]C#C* 0.000 description 1
- 230000005284 excitation Effects 0.000 description 1
- 239000003063 flame retardant Substances 0.000 description 1
- 230000003137 locomotive effect Effects 0.000 description 1
- 229910052573 porcelain Inorganic materials 0.000 description 1
- 239000007787 solid Substances 0.000 description 1
- 238000004804 winding Methods 0.000 description 1
Abstract
The invention belongs to technical field of electricity, specially a kind of stainless steel stepwise adjustable resistance and modulated brake resistance, adjustable resistance includes the resistor main body being welded by several sub-resistance head and the tail and U-shaped insulating part, the head end of the sub-resistance of side and the tail end of other side sub-resistance are respectively formed resistance input terminal and resistance output end, copper bar is shorted to be set in resistor main body, U-shaped insulating part is fixed between the stainless steel band of sub-resistance, it is shorted different overlapping modes by copper bar, can be achieved with resistance and export different resistance values；The stepwise adjustable resistance, which is put in water, forms braking resistor, its resistance and water determine the resistance value of braking resistor jointly, stepwise adjustable resistance comes into full contact with water, it is increased with the temperature of dampening, it absorbs largely because of the heat of electric energy conversion, so that it is guaranteed that safety of the stepwise adjustable resistance when current density is very big, realizes the quick reduction of speed of high-power large-size machine, the braking resistor power of formation is big, electric current is big, high pressure resistant, absorption energy is high.
Description
Technical field
The invention belongs to technical field of electricity, and in particular to a kind of point external for motor in large-size machine down speeding procedure
Section adjustable resistance and the braking resistor being made from it.
Background technique
Braking resistor at present mainly should be in railway locomotive dynamic brake and in Frequency Converter Control decelerating through motor and braking
In circuit.The basic principle of braking resistor application is all: output voltage is generated after the motor excitation rotated, motor passes through outer
It connects braking resistor or current transformer and combines forming circuit with braking resistor, generate electric current, the machinery of motor during motor reduction
It can be converted into electric energy, and consumed in braking resistor in the form of thermal energy.
Braking resistor typically belongs to large power winding formula resistance by material classification, and concrete application mostly uses ripple electric at present
Resistance, it usually secures two leading-out terminals on cylindrical porcelain tube, is wound with bandlet wave-like in ceramic pipe surface
Alloy resistance wire, and its surface coat one layer have it is fire-retardant, the coating of high-temperature stability, ceramic tube is as resistance wire skeleton
Meanwhile and having effects that radiator.
With the fast development of more and more high-power large-size machines and its control frequency converter, in order to guarantee power supply unit
Safety needs to realize that motor reduction is adjusted by braking resistor, it is enterprising that the internal energy of power supply unit is transferred to outer connecting resistance
Row consumption, to guarantee power supply unit safety, in order to achieve the purpose that fast quick-release can, need outer connecting resistance have superpower (>=
100MVA), the features such as high current (>=5000A), high pressure resistant and absorption high-energy.However, having simultaneously currently on the market especially big
Power, high current, braking resistor product or blank high pressure resistant and that absorb high-energy feature.
Summary of the invention
The object of the present invention is to provide a kind of stainless steel stepwise adjustable resistance and modulated brake resistance, can be realized high-power
The quick reduction of speed of large-size machine, current density is big and is unlikely to deform.
Technical scheme is as follows:
A kind of stainless steel stepwise adjustable resistance, including pass through to be shorted stainless steel band and weld by several segments sub-resistance head and the tail and be linked to be
Resistor main body, and the U-shaped insulating part being mounted between the sub-resistance of resistor main body, the head end of the sub-resistance of side and another
The tail end of side sub-resistance is respectively formed resistance input terminal and resistance output end, further includes the short circuit copper bar in resistor main body,
The section of the U-shaped insulating part be U-shaped, be fixed between the stainless steel band of sub-resistance, U-shaped insulating part length direction with
Plane where sub-resistance is vertical.
Otic placode is welded on the sub-resistance, is equipped with mounting hole in otic placode, installation bolt is in the mounting hole to fixed U-shaped
Insulating part.
The sub-resistance uses rectangular section for 50*10mm stainless steel band, and through bending is subcooled, welding processing is formed.
The U-shaped insulator material is that vinyl modified epoxy enhances mould material.
The upper end bending radian of each sub-resistance is selected as R25mm~R50mm, and the spacing between sub-resistance is 40mm
~500mm, the width of stainless steel band are 40mm~500mm.
The U-shaped insulating part point two layers of installation in resistor main body, i.e. the U-shaped insulating part on upper layer are located at same level height
Degree, the U-shaped insulating part of lower layer is located at same level height, and the U-shaped insulating part of the upper and lower is interlaced.
The mounting means of the short circuit copper bar is that will connect and/or incite somebody to action in the two ends of the sub-resistance where input terminal
The end of the output end sub-resistance adjacent with sub-resistance where output end connects.
A kind of stainless steel is segmented braking resistor, it includes insulation box and to be set to insulated case intracorporal such as claim~institute
The stepwise adjustable resistance stated, the interior water for placing certain altitude of insulation box, water energy there were not segmentation adjustable resistance, and the water surface can to segmentation
Tune Top Resistance is 150~200mm, and overflow pipe is equipped with before the insulation box, and bottom is equipped with discharging valve.
Further include cabinet body, dismountable front beam be equipped on front side of the cabinet body, be fixedly mounted in cabinet body insulator with not
Become rusty steel vertical beam, and the insulation box of the braking resistor is connect with above-mentioned insulator with stainless steel vertical beam, the short circuit copper bar
It is fixed on stainless steel vertical beam by insulator, cabinet top installs power input, and cabinet body front panel is switched equipped with moisturizing, cabinet body
Side upper end is equipped with fan shroud and exhaust pipe, and bottom of cabinet bulk is equipped with return pipe.
The insulation box bottom is laid with ceramic tile, and stepwise adjustable resistance is put in above ceramic tile.
Remarkable result of the invention is as follows:
Sub-resistance material takes stainless steel 0Cr18Ni19 (national standard), can satisfy high current by indeformable and enough
Heat dissipation area, stainless steel section are chosen to be rectangle, when rated current be 10000A, be designed and sized to 50X10mm, that is, ensure that
In the indeformable and enough heat dissipation area of high current or so；
Only one input terminal of stepwise adjustable resistance, an end output end, but the exportable multiple groups resistance value of resistance, it is mainly logical
It crosses copper bar and is shorted different taps, can be achieved with resistance and export different resistance values；
Stainless steel band uses 0Cr18Ni19, and uses cold bending technique, i.e., is added using big radian Bending Mould and slower
Work speed carries out bending, avoids causing to be cracked on bending radian.So stainless steel metallographic structure will not generate biggish variation,
Resistance variations are very small, and only 0.5%~1% or so.
Otic placode is welded in resistor main body side, is drilled on otic placode, hole is mainly used for wearing bolt, and the bolt is for fixed exhausted
Edge accessory and resistor main body, the hole are not worked on resistor main body stainless steel band, will not influence resistance sections electric current and resistance
Value.
In use, resistance determines the resistance value of braking resistor with water jointly since the stepwise adjustable resistance is put in water, point
Section adjustable resistance comes into full contact with water, and since its resistance conductive rate is significantly larger than the conductivity than water, the electric current of braking resistor is exhausted
It is most of to pass through stepwise adjustable resistance, and since the specific heat of water is very big, it increases, is absorbed largely because electric energy is converted with the temperature of dampening
Heat, so that it is guaranteed that safety of the stepwise adjustable resistance when current density is very big, heat absorption low using the conductivity of water is than high
With the features such as conductivity of alloy is high, current density is big and is unlikely to deform, the quick reduction of speed of high-power large-size machine, the system are realized
Dynamic resistance has the characteristics that especially big high-power, high current, high pressure resistant and absorption high-energy.
Detailed description of the invention
Fig. 1 is superpower high current stepwise adjustable braking resistor schematic diagram；
Fig. 2 is superpower high current stepwise adjustable braking resistor front view；
Fig. 3 is superpower high current stepwise adjustable braking resistor side view；
Fig. 4 a is to utilize the schematic diagram being shorted when copper bar realizes 2a output valve；
The path schematic diagram of electric current flowing when Fig. 4 b is resistance output 2a；
Fig. 5 a is to utilize the schematic diagram being shorted when copper bar realizes 3a output valve；
The path schematic diagram of electric current flowing when Fig. 5 b is resistance output 3a；
Fig. 6 a is to utilize the schematic diagram being shorted when copper bar realizes 4a output valve；
The path schematic diagram of electric current flowing when Fig. 6 b is resistance output 4a；
Fig. 7 a is to utilize the schematic diagram being shorted when copper bar realizes 5a output valve；
The path schematic diagram of electric current flowing when Fig. 7 b is resistance output 5a；
Fig. 8 is that stepwise adjustable resistance constitutes braking resistor schematic diagram；
Fig. 9 is that stainless steel is segmented braking resistor schematic diagram；
In figure；1. resistance input terminal；2. resistance output end；3. resistance mounting rail；4. resistor main body；5.U shape insulating part；6.
It is shorted stainless steel band；7. being shorted copper bar；8. otic placode；9. sub-resistance；10. overflow pipe；11. discharging valve；12. insulation box；13.
Stepwise adjustable resistance；14. front beam；15. insulator and stainless steel vertical beam；16. moisturizing switchs；17. fan shroud and exhaust pipe；
18. return pipe；19. cabinet body.
Specific embodiment
Below by the drawings and the specific embodiments, the invention will be further described.
As shown in Figure 1, the stepwise adjustable resistance in this patent includes by 5 sections of 9 head and the tail of sub-resistance by being shorted stainless steel band 6
The resistor main body 4 being linked to be, and the U shape insulating part 5 being mounted between 4 sub-resistance 9 of resistor main body are welded, for the ease of installation
Resistance mounting rail 3 is equipped in resistor main body 4.The head end of the sub-resistance of side and the tail end of other side sub-resistance are respectively formed electricity
Hinder input terminal 1 and resistance output end 2.
As shown in Fig. 2, the section of U-shaped insulating part 5 is U-shaped, it is mounted between the stainless steel band of sub-resistance, it is solid by bolt
Fixed, plane is hung down where 5 length direction of U-shaped insulating part and sub-resistance.The effect of U-shaped insulating part 5 is fixed each sub-resistance 9, will
Grading resistance forms a whole.
When assembly, upper layer and lower layer installation can be divided into, i.e., the U-shaped insulating part 5 on upper layer is located at same level height, the U of lower layer
Shape insulating part 5 is located at same level height, and the U-shaped insulating part 5 of the upper and lower is interlaced, as shown in Figure 1.
5 material of U-shaped insulating part may be selected vinyl modified epoxy enhance mould material, can high pressure resistant (>=30KV), high temperature resistant (>=
180 DEG C), the weather-proof time is long, can bear higher combined stress.
As shown in figure 3, can preferably weld otic placode 8 on sub-resistance 9, punched on otic placode 8, passes through otic placode 8 when installation
On mounting hole installation bolt to fixed U-shaped insulating part 5.U-shaped insulating part 5 is installed due to using otic placode 8, is not existed directly
It is punched in resistor main body 4, therefore will not influence resistance sections electric current and resistance value.
As shown in Figures 2 and 3, the sub-resistance 9 in resistor main body 4 uses rectangular section for 50X10mm stainless steel band, passes through
Cold bending, welding processing form, integral being welded the head and the tail of 5 sections of sub-resistances 9 by short circuit stainless steel band 6, become resistance
Ontology 4.Every section of 9 resistance value of sub-resistance is identical, and deviation must not exceed 3%, can be upper grading resistance by deviation when selection
Grading resistance collocation under being with deviation is mixed, can guarantee well total resistance value deviation that 5 sections of resistance add up 3% it
It is interior.
The upper end bending radian of each sub-resistance is selected as R25mm~R50mm, and the spacing of sub-resistance is 40~500mm, no
The width of rust steel band is preferably 50mm~300mm.
Preferably, stainless steel band material is 0Cr18Ni19.Before processing, cold bending is carried out, stainless steel band is prevented
Cracking is generated in bending part, using big radian bending (R30mm~200mm).This is because hot bending adds using acetylene
The mode of heat, is heated, which is more than 500 DEG C or more, just can be carried out Bending Processing, will cause not in bending position
Rust steel metallographic structure changes.It is tested by loop resistance instrument, hot bending will lead to resistivity and become smaller, and resistance can reduce 3%
~5%.Based on the above reasons, the mode of cold bending is selected.
Cold bending is to carry out bending using big radian Bending Mould and slower process velocity, avoids making on bending radian
At cracking.So stainless steel metallographic structure will not generate biggish variation, resistance variations are very small, and only 0.5%~1% is left
It is right.
The resistance collocation of the application is shorted copper bar and can be realized as the output of a variety of resistance values.Set each grading resistance
Resistance value is a, it is desirable that totally 4 gears, concrete scheme are as follows by output 2a, 3a, 4a, 5a.
As shown in fig. 4 a, 2a output valve is realized using short circuit copper bar.
The head and the tail of sub-resistance 9 where input terminal 1 are got up using the overlap joint of copper bar 7 is shorted, and by output end 2 and are exported
The end for the sub-resistance 9 for holding 2 place sub-resistances adjacent is overlapped using copper bar 7 is shorted, it will be able to realize 2a output valve, electricity
The path of flowing is as shown in Figure 4 b.
As shown in Figure 5 a, 3a output valve is realized.
Only the end of the sub-resistance 9 adjacent with 2 place sub-resistance of output end of output end 2 is overlapped using copper bar 7 is shorted
Come, the path of electric current flowing is as shown in Figure 5 b.
As shown in Figure 6 a, 4a output valve is realized.
Only the head and the tail of the sub-resistance 9 where input terminal 1 are got up using the overlap joint of copper bar 7 is shorted, the path of electric current flowing
As shown in Figure 6 b.
As shown in Figure 7a, 5a output valve is realized, it is only necessary to take down all short circuit copper bars, the path of electric current flowing such as Fig. 7 b
It is shown.
Braking resistor can also be constituted by above-mentioned stepwise adjustable resistance, as shown in figure 8, braking resistor includes insulation box
12, water and above-mentioned stepwise adjustable resistance 13,12 bottom of insulation box are laid with ceramic tile, and adjustable resistance 13 is put in above ceramic tile.Ceramic tile
Main function is heat-insulated and support.Stepwise adjustable resistance body submerges, and guarantee the water surface to Top Resistance be 150~
200mm can guarantee that section tune resistance comes into full contact with water, in time by heat from resistance conducts to water in.It is welded before insulation box 12
Overflow pipe 10 is connect, excessive plus water is mainly prevented, more than after specified value, water can guide the water surface from overflow pipe, overflow without water occurs
At the top of water tank, other equipment are not interfered with more.Discharging valve 11 is welded in 12 bottom of insulation box, can replace in water tank in time
Water.
Braking resistor can be put into cabinet body 19, as shown in figure 9, cabinet Inner Front End is installed by front beam 14, front beam of dismantling,
Water tank can be released outside cabinet and be repaired.Be fixedly mounted insulator and stainless steel vertical beam 15 in cabinet body, braking resistor it is exhausted
Edge cabinet 13 is connect with above-mentioned insulator with stainless steel vertical beam 15, so that braking resistor is fixed in cabinet body, guarantees resistance logical
When super-high-current, sliding, displacement shake are not generated.It is shorted copper bar 7 to be fixed in cabinet inboard beams by insulator, cabinet top installs power supply
Input terminal；Output end is put in cabinet body front, and resistance output end is shorted together by copper bar.Before moisturizing switch 16 is put in cabinet body
Portion, after opening front door, so that it may which manual operation carries out moisturizing, operates convenient for personnel.Three-phase blower (not illustrating in figure) is mounted in cabinet body
Vapor in cabinet is in time extracted out by fan shroud and exhaust pipe 17 in rear portion, prevents device in vapor damage cabinet, accelerates
Water cooling velocity in water tank.Return pipe 18 is mounted on bottom of cabinet bulk side, in time by the water or height of the cleaning equipment in water tank
Warm water is drained.
Claims (10)
1. a kind of stainless steel stepwise adjustable resistance, including several segments sub-resistance (9) are connected by being shorted stainless steel band (6) welding from beginning to end
At resistor main body (4), and the U-shaped insulating part (5) being mounted between the sub-resistance (9) of resistor main body (4), point electricity of side
The head end of resistance and the tail end of other side sub-resistance are respectively formed resistance input terminal (1) and resistance output end (2), further include being set to electricity
Hinder the short circuit copper bar (7) on ontology (4), it is characterised in that: the section of the U-shaped insulating part (5) is U-shaped, is fixed at
Between the stainless steel band of sub-resistance, U-shaped insulating part (5) length direction is vertical with plane where sub-resistance.
2. a kind of stainless steel stepwise adjustable resistance as described in claim 1, it is characterised in that: welded on the sub-resistance (9)
Ear connecting plate (8) is equipped with mounting hole in otic placode (8), and installation bolt is in the mounting hole to fixed U-shaped insulating part (5).
3. a kind of stainless steel stepwise adjustable resistance as described in claim 1, it is characterised in that: the sub-resistance (9) uses
Rectangular section is 50*10mm stainless steel band, and through bending is subcooled, welding processing is formed.
4. a kind of stainless steel stepwise adjustable resistance as described in claim 1, it is characterised in that: described U-shaped insulating part (5) material
Material is that vinyl modified epoxy enhances mould material.
5. a kind of stainless steel stepwise adjustable resistance as described in claim 1, it is characterised in that: each sub-resistance it is upper
End bending radian is selected as R25mm~R50mm, and the spacing between sub-resistance is 40mm~500mm, and the width of stainless steel band is 40mm
~500mm.
6. a kind of stainless steel stepwise adjustable resistance as claimed in any one of claims 1 to 5, wherein, it is characterised in that: the U-shaped
Insulating part (5) point two layers of installation, i.e. U-shaped insulating part (5) on upper layer on resistor main body (4) are located at same level height, lower layer
U-shaped insulating part (5) be located at same level height, and the U-shaped insulating part (5) of the upper and lower is interlaced.
7. a kind of stainless steel stepwise adjustable resistance as claimed in any one of claims 1 to 5, wherein, it is characterised in that: described is short
The mounting means for connecing copper bar (7) is, will connect in the two ends of the sub-resistance (9) where input terminal (1) and/or by output end
(2) end of the sub-resistance (9) adjacent with sub-resistance where output end (2) connects.
8. a kind of stainless steel is segmented braking resistor, it is characterised in that: it includes insulation box (12) and is set to insulation box (12)
The interior stepwise adjustable resistance as described in claim 1~7, the interior water for placing certain altitude of insulation box, water energy there were not segmentation
Adjustable resistance, the water surface to stepwise adjustable resistance (13) top are 150~200mm, are equipped with overflow pipe before the insulation box
(10), bottom is equipped with discharging valve (11).
9. a kind of stainless steel as claimed in claim 8 is segmented braking resistor, it is characterised in that: it further include cabinet body (19), it is described
Cabinet body (19) on front side of be equipped with dismountable front beam (14), insulator and stainless steel vertical beam are fixedly mounted in cabinet body (19)
(15), the insulation box (12) of the braking resistor connect (15) with stainless steel vertical beam with above-mentioned insulator, the short circuit
Copper bar 7 is fixed on stainless steel vertical beam (15) by insulator, and cabinet top installs power input, and cabinet body front panel is equipped with moisturizing
Switch 16, cabinet body side upper end are equipped with fan shroud and exhaust pipe (17), and bottom of cabinet bulk is equipped with return pipe (18).
10. a kind of stainless steel is segmented braking resistor as claimed in claim 8 or 9, it is characterised in that: the insulation box
(12) bottom is laid with ceramic tile, and stepwise adjustable resistance (13) is put in above ceramic tile.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201711135237.0A CN109801766B (en) | 2017-11-16 | 2017-11-16 | Stainless steel sectional adjustable resistor and adjustable resistor |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201711135237.0A CN109801766B (en) | 2017-11-16 | 2017-11-16 | Stainless steel sectional adjustable resistor and adjustable resistor |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| CN109801766A true CN109801766A (en) | 2019-05-24 |
| CN109801766B CN109801766B (en) | 2024-04-09 |
Family
ID=66555313
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201711135237.0A Active CN109801766B (en) | 2017-11-16 | 2017-11-16 | Stainless steel sectional adjustable resistor and adjustable resistor |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN109801766B (en) |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN114334313A (en) * | 2021-12-30 | 2022-04-12 | 广东福德电子有限公司 | High-power resistor with bone-shaped resistor belt |
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| Publication number | Priority date | Publication date | Assignee | Title |
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| CN114334313A (en) * | 2021-12-30 | 2022-04-12 | 广东福德电子有限公司 | High-power resistor with bone-shaped resistor belt |
| CN114334313B (en) * | 2021-12-30 | 2024-04-05 | 广东福德电子有限公司 | High-power resistor with bone-shaped resistor strip |
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