CN114388208B - Snake-shaped resistor bending method and crowbar resistor - Google Patents
Snake-shaped resistor bending method and crowbar resistor Download PDFInfo
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- CN114388208B CN114388208B CN202210107758.XA CN202210107758A CN114388208B CN 114388208 B CN114388208 B CN 114388208B CN 202210107758 A CN202210107758 A CN 202210107758A CN 114388208 B CN114388208 B CN 114388208B
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- 238000005452 bending Methods 0.000 title claims abstract description 79
- 238000000034 method Methods 0.000 title claims abstract description 21
- WYTGDNHDOZPMIW-RCBQFDQVSA-N alstonine Natural products C1=CC2=C3C=CC=CC3=NC2=C2N1C[C@H]1[C@H](C)OC=C(C(=O)OC)[C@H]1C2 WYTGDNHDOZPMIW-RCBQFDQVSA-N 0.000 claims abstract description 54
- 238000005192 partition Methods 0.000 claims description 10
- 239000011810 insulating material Substances 0.000 claims description 2
- 230000000149 penetrating effect Effects 0.000 claims 1
- 239000002131 composite material Substances 0.000 abstract description 5
- 238000009434 installation Methods 0.000 description 11
- 238000010586 diagram Methods 0.000 description 9
- 238000010248 power generation Methods 0.000 description 9
- 229910052573 porcelain Inorganic materials 0.000 description 6
- 238000001514 detection method Methods 0.000 description 5
- 238000005516 engineering process Methods 0.000 description 5
- 230000017525 heat dissipation Effects 0.000 description 5
- 239000012212 insulator Substances 0.000 description 5
- 238000004519 manufacturing process Methods 0.000 description 5
- 238000003466 welding Methods 0.000 description 4
- 239000003990 capacitor Substances 0.000 description 3
- 238000005336 cracking Methods 0.000 description 3
- 238000009413 insulation Methods 0.000 description 3
- 239000000463 material Substances 0.000 description 3
- 230000035939 shock Effects 0.000 description 3
- 125000006850 spacer group Chemical group 0.000 description 3
- 208000029154 Narrow face Diseases 0.000 description 2
- 230000009286 beneficial effect Effects 0.000 description 2
- 238000010276 construction Methods 0.000 description 2
- 230000007547 defect Effects 0.000 description 2
- 230000000694 effects Effects 0.000 description 2
- 238000002955 isolation Methods 0.000 description 2
- 241000512005 Alstonia Species 0.000 description 1
- RYGMFSIKBFXOCR-UHFFFAOYSA-N Copper Chemical compound [Cu] RYGMFSIKBFXOCR-UHFFFAOYSA-N 0.000 description 1
- 238000010521 absorption reaction Methods 0.000 description 1
- 230000002411 adverse Effects 0.000 description 1
- 238000013459 approach Methods 0.000 description 1
- 230000000903 blocking effect Effects 0.000 description 1
- 229910052802 copper Inorganic materials 0.000 description 1
- 239000010949 copper Substances 0.000 description 1
- 230000008878 coupling Effects 0.000 description 1
- 238000010168 coupling process Methods 0.000 description 1
- 238000005859 coupling reaction Methods 0.000 description 1
- 238000011161 development Methods 0.000 description 1
- 230000007613 environmental effect Effects 0.000 description 1
- 238000010438 heat treatment Methods 0.000 description 1
- 239000011159 matrix material Substances 0.000 description 1
- 239000010445 mica Substances 0.000 description 1
- 229910052618 mica group Inorganic materials 0.000 description 1
- 238000012986 modification Methods 0.000 description 1
- 230000004048 modification Effects 0.000 description 1
- 238000012544 monitoring process Methods 0.000 description 1
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- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01C—RESISTORS
- H01C17/00—Apparatus or processes specially adapted for manufacturing resistors
- H01C17/04—Apparatus or processes specially adapted for manufacturing resistors adapted for winding the resistive element
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- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01C—RESISTORS
- H01C1/00—Details
- H01C1/01—Mounting; Supporting
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- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01C—RESISTORS
- H01C17/00—Apparatus or processes specially adapted for manufacturing resistors
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- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01C—RESISTORS
- H01C3/00—Non-adjustable metal resistors made of wire or ribbon, e.g. coiled, woven or formed as grids
- H01C3/06—Flexible or folding resistors, whereby such a resistor can be looped or collapsed upon itself
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Abstract
The utility model discloses a serpentine resistor bending method, which comprises the following steps: and a mode of bending after overlapping the multi-layer resistance bands is adopted. During bending, the resistance bands of different layers can slide relatively, so that bending strain and bending stress of the outer resistance bands during bending are reduced. To reduce the minimum allowable bending radius and bending stress, thereby reducing the spacing between the resistive bands, making the serpentine resistor more compact to increase the power density of the serpentine resistor. The utility model also discloses a crowbar resistor: the multilayer snake-shaped resistor comprises a shell and a plurality of layers of snake-shaped resistors arranged in the shell, wherein the snake-shaped resistors are formed by bending laminated resistor bands and are arranged on a composite side plate with a space layer. The high-voltage power supply has the characteristics of compact structure, high power density, good insulating property, good earthquake resistance, safety and reliability.
Description
Technical Field
The utility model relates to the field of wind power generation, in particular to a serpentine resistor bending method and a crowbar resistor.
Background
With the increasing prominence of energy crisis and environmental problems, renewable energy industries such as wind power generation, solar power generation and the like are greatly developed in various countries in the world. With the rapid development of wind power, the installed capacity is rapidly increased, and the proportion of wind power generation in power supply of a power grid is continuously increased, so that the grid connection quality and the running state of the wind generating set are crucial to the stability of the power grid. During operation, grid faults may lead to voltage drops, which may bring about a series of transient processes to the wind power plant, such as overvoltage, overcurrent or increase in rotational speed.
The disconnection of a large number of wind driven generators caused by grid voltage drop faults can cause great change of power flow of a power system and even cause stability problems of frequency caused by large-area power failure. Thus, low voltage ride through (LowVoltage Ride Through; hereinafter abbreviated as LVRT) technology of wind power plants has emerged, namely: when the voltage of the power grid drops, the wind power generation equipment can keep grid connection within the set value and the set time of the voltage drop, and the recovery of the voltage of the power grid is supported until the power grid is recovered to be normal. The wind power generation equipment has effective LVRT measures to maintain the stability of the wind field power grid.
In order to realize the LVRT function, a low-voltage bypass system is generally adopted in the existing wind power generation equipment, namely an active crowbar technology is adopted on the rotor side. The common active Crowbar technology comprises an insulated gate bipolar power tube (Insulated Gate Bipolar Transistor; hereinafter referred to as IGBT) circuit, a hybrid bridge Crowbar circuit, a Crowbar circuit with a bypass resistor and the like, and the active Crowbar technology shunts the current of a rotor and a frequency converter through the bypass when the voltage of a power grid drops, so that the influence of overcurrent can be avoided, and a wind generating set can not be separated from the power grid, thereby realizing the LVRT function.
The crowbar technique requires the use of a crowbar resistor to convert excess electrical energy into thermal energy that is dissipated into the air by convection. The crow bar resistor is densely arranged in an array by adopting the resistor sheets or the resistor strips, so that larger resistor is accommodated in the unit volume of the crow bar resistor, the power density of the crow bar resistor is increased, and meanwhile, the resistor sheets or the resistor strips are ensured to have the function of meeting the heat dissipation gap.
When the resistor strip is used to make a crowbar resistor, the resistor strip may be bent into a serpentine shape with a continuous U-bend. In order to increase the power density of the crowbar resistor, the spacing between the resistor strips should be minimized, so a smaller bend radius is required. But when the radius of curvature is less than the maximum radius of curvature allowed by the material, the resistance bands can crack, or even break. Therefore, the prevention of cracking in the bending process of the serpentine resistor is a technical problem to be solved in manufacturing the serpentine resistor and the crowbar resistor.
Meanwhile, the existing crowbar resistor adopts a string rod (screw rod) to assemble the resistor disc and the porcelain insulator together. Because the shock resistance of the porcelain insulator is not ideal, when strong wind causes the wind turbine to vibrate greatly and impact, the porcelain insulator may break and even fall off, resulting in short circuit and safety accidents. In addition, the existing crowbar resistor has the defects of more parts, complex structure, high production cost and low production efficiency.
Through patent search, the patents related to the utility model mainly comprise the following patents:
1. chinese patent application No. "201110285663.9", application date "2011.09.23", publication No. "CN103018615a", publication date "2013.04.03", entitled "a device for detecting crowbar circuit in wind turbine", and application number "taida electronic enterprise management (Shanghai) limited", the patent of the utility model provides a method for detecting crowbar circuit in wind turbine including a converter electrically connected to crowbar circuit, including: electrically coupling a detection module to the crowbar circuit; inputting a first control signal to the crowbar circuit to turn on the crowbar circuit; providing three-phase voltage signals to the crowbar circuit through the converter, wherein adjacent two-phase voltage signals are separated by a preset phase angle; reading a first detection signal output by the detection module to judge whether the crowbar circuit is normally put into operation; inputting a second control signal to the crowbar circuit to turn off the crowbar circuit; and reading the second detection signal output by the detection module again to judge whether the crowbar circuit is normally cut out. Compared with the prior art, the utility model can rapidly judge whether the crowbar circuit can be normally switched, and can also reduce the damage of the converter possibly caused by the crowbar circuit to the minimum, thereby effectively protecting the core device of the wind power system. But this patent does not relate to a specific structure of the crowbar resistor.
2. Chinese patent application No. "201310101434.6", filing date "2013.03.27", publication No. "CN103368493a", publication date "2013.10.23", entitled "improved hard precharge for parallel inverters", filed "alstonia traffic equipment limited", which relates to improved hard precharge for parallel inverters, each motor being controlled with at least one of two inverters connected in parallel to a common power line, the common power line providing a DC power signal with a respective DC link, an isolating switch being provided for each of the two inverters, which isolates the corresponding inverter from the power line, each inverter being further connected to the common power line by a filter capacitor bank and means for precharging the capacitor bank, the precharge means comprising a crowbar resistor and an automatic power switch, which transmits the DC power signal to the crowbar resistor when the voltage exceeds a predetermined threshold. The utility model provides means for alternately closing the isolation switch of one of the two inverters and a connection for transferring the power signal from the crowbar resistor of the inverter connected to the power signal supply line through the automatic power switch to the filter capacitor bank of the other inverter isolated from the power signal supply line. But this patent is also silent about the specific construction of the crowbar resistor.
3. The utility model relates to a low-voltage ride through control device and wind power generation equipment, which are named as ' CN200920247136.7 ', 2009.11.18 ' on the filing date, CN201570870U ' on the filing date, 2010.09.01 ' on the filing date and Hua Rui wind power technology (group) Co., ltd. The control device includes: the device comprises a stator circuit breaker, a crowbar protection circuit breaker, a thyristor, a shunt circuit and a control module comprising a voltage monitoring unit, a stator control unit, a crowbar switch control unit and a thyristor control unit, wherein the thyristor is controlled to be closed when the voltage value of a direct current bus is monitored to be higher than a set threshold value, so that the shunt circuit is used for shunt protection of a frequency converter group; in the state that the thyristor is closed, controlling the stator breaker to be opened, and then controlling the crowbar protection circuit breaker to finish the operation of opening and reclosing; and controlling the stator breaker to be closed when the voltage value of the power grid is monitored to be equal to or larger than a set threshold value. The utility model realizes the low voltage ride through function with a simple structure and can avoid adverse effects of power grid fluctuation caused by reactive power absorption from the power grid. But the patent is equally silent as to the specific construction of the crowbar resistor.
4. The utility model patent with the application number of CN20111068060. X, the application date of 2011.03.28, the publication number of CN202058525U, the publication date of 2011.11.30, the name of wind power brake resistor, the application of being a 'Ningbo middle-time electronic Limited company' is disclosed, the wind power brake resistor is arranged in a wind power generation system, redundant electric power is converted into heat energy and is dissipated when the wind power generator brakes, the wind power generator comprises a shell, a plurality of layers of resistor unit layers which are arranged in the shell from top to bottom in sequence are further included, each layer of resistor unit layer comprises a front screw rod, a rear screw rod, a plurality of insulating porcelain sleeves which are sleeved on the front screw rod and the rear screw rod, and a plurality of resistor porcelain sleeves which are arranged from left to right in sequence, both ends of the front screw rod and the rear screw rod are fixed on the shell through insulating pieces, all resistor pieces are connected in a head-tail welding mode, welding positions among all resistor pieces are alternately sleeved on the rear screw rod and the front screw rod, the insulating pieces are distributed among adjacent welding positions, and all layers of resistor unit layers are electrically connected in series. Under the condition of ensuring the original shell volume, the utility model effectively increases the resistance material to meet the performance requirement of large through flow and high power, and simultaneously ensures the heat dissipation effect. However, the patent adopts the screw 3 and the insulator 2 to connect the resistor disc 6 in series, and the two ends of the resistor disc 6 are welded, so that the structure is complex, the parts are more, the working procedures are more, and the cost is high.
5. The utility model patent with the application number of '202022199132.5', the application date of '2020.09.29', the publication number of 'CN 213935796U', the publication date of '2021.08.10', the name of 'a strip resistor', and the application number of 'Guangdong Ford electronic Co., ltd', comprises a side plate, a string rod, a locking piece, a flat resistance band and a plurality of insulating seats, wherein connecting holes are formed in the middle parts of the plurality of insulating seats, and the string rod penetrates through the connecting holes of the plurality of insulating seats, so that the plurality of insulating seats are arranged and connected in series; the limiting grooves are formed in the two sides, located in the arrangement direction, of the insulating seats, the resistor belts continuously bend to penetrate through the space between every two adjacent insulating seats, the narrow faces of all the sections of the resistor belts are respectively embedded into the limiting grooves of the two adjacent insulating seats, the wide faces of the flat resistor belts face the arrangement direction perpendicular to the insulating seats, namely the narrow faces of the two adjacent sections of the same resistor belt face each other, and the wide faces are arranged in parallel, so that in the use process, the current directions of the two adjacent sections of the same resistor belt are not easy to deform and approach each other even if the current directions of the two adjacent sections of the same resistor belt are opposite, and the insulation performance can be improved. However, the patent uses welding to manufacture the serpentine resistor band instead of bending.
Disclosure of Invention
The utility model aims to solve the technical problem of providing a serpentine resistor bending method and a crowbar resistor aiming at the defects in the prior art.
In order to solve the technical problems, the utility model adopts the following technical scheme: a serpentine resistor bending method is provided, wherein the serpentine resistor is formed by bending a resistor strip into a serpentine shape with a plurality of continuous U-shaped bends. By reducing the thickness of the resistive bands, the minimum allowable bending radius and bending stress are reduced, so that the spacing between the resistive bands is reduced, the serpentine resistor is more compact, and the power density of the serpentine resistor is improved.
Further, after overlapping the plurality of layers of thinner resistance bands, replacing the thicker resistance bands to reduce the thickness of the resistance bands; in the bending process, the resistance bands of different layers can slide relatively, so that bending strain and bending stress of the outer resistance bands in bending are reduced. The mode of bending the snake-shaped resistor by the laminated resistor band can avoid cracks during bending.
The utility model also relates to a crowbar resistor comprising: a housing and a resistor disposed within the housing. The resistor is a snake-shaped resistor bent by the snake-shaped resistor bending method. The power density of the crowbar resistor is improved by adopting the serpentine resistor with high power density.
Further, the U-shaped bent bottom of the serpentine resistor is provided with mounting holes, and the serpentine resistor is vertically arranged between two side plates in the shell according to the width direction. So as to improve the overall rigidity and the shock resistance of the crowbar resistor. Because the snake-shaped resistor is directly arranged on the insulated side plate by adopting the screw or the rivet, the structure is simple, the installation is simple and convenient, the production efficiency is high, the cost is low, and the insulator is not made of fragile porcelain pieces, thereby having excellent anti-seismic performance.
Further, a plurality of serpentine resistors are connected in series, the inlet end and the outlet end of each serpentine resistor are provided with connecting plates, and the connecting plates are provided with connecting holes; the thickness of the connecting plate is not less than the thickness of the serpentine resistor; the width of the resistance band is less than or equal to 1.5 times that of the connecting plate is less than or equal to 3 times that of the resistance band; the connecting plate is connected with the inlet and outlet ends of the serpentine resistor in an offset manner. So as to reduce the contact resistance of the inlet and outlet ends and ensure reliable connection.
Further, the housing includes: a bottom plate, side plates and a top plate; the side plate is formed by assembling a side plate frame, an outer side plate, a partition plate and an inner side plate in sequence, wherein the outer side plate, the partition plate and the inner side plate are made of insulating materials, and a spacing layer for accommodating connecting pieces is formed between the outer side plate and the inner side plate by the partition plate. The exposed connecting piece is sealed in the insulating layer of the composite side plate, so that the insulating performance of the shell is ensured, the safety is ensured, and the shell is smooth and attractive.
Further, a self-plugging rivet is adopted to connect the snake-shaped resistor to the inner side plate, and the tail of the rivet is positioned in the air-isolation layer. Because the thickness of the rivet tail is smaller than that of the nut, the thickness of the insulating layer can be reduced, the outline dimension of the shell is reduced, or the creepage distance between the rivet tail and the outer side plate is increased, and the insulating performance is further improved.
Further, a guide rail is provided at the outer lower side of the side plate frame.
Further, the device also comprises a mounting plate provided with a guide groove and a positioning hole.
Further, the crowbar resistor is mounted on the mounting plate in a push-pull mode through the matching of the guide rail and the guide groove on the mounting plate, and is locked by using a locking screw to penetrate through the mounting hole on the bottom plate and be screwed into the positioning hole of the mounting plate. The push-pull installation mode is adopted, the installation is simple and quick, and the installation efficiency is improved.
The utility model has the beneficial effects that: the serpentine resistor bending method of the utility model comprises the following steps: and a mode of bending after overlapping the multi-layer resistance bands is adopted. During bending, the resistance bands of different layers can slide relatively, so that bending strain and bending stress of the outer resistance bands during bending are reduced. To reduce the minimum allowable bending radius and bending stress, thereby reducing the spacing between the resistive bands, making the serpentine resistor more compact to increase the power density of the serpentine resistor. The crowbar resistor is a serpentine resistor bent by a laminated resistor band and is arranged on a composite side plate with a spacing layer. The high-voltage power supply has the characteristics of compact structure, high power density, good insulating property, good earthquake resistance, safety and reliability.
Drawings
Figure 1 is a schematic diagram of a conventional resistive strip bending U-bend,
FIG. 2 is a schematic diagram of a conventional resistive strip bending U-bend,
figure 3 is a schematic diagram of a conventional resistive strip bending U-bend,
FIG. 4 is a schematic diagram of a resistive band bending U-bend of the present utility model,
FIG. 5 is a second schematic view of the bending U-bend of the resistance band of the present utility model,
figure 6 is a schematic diagram of a U-bend for a resistor strip according to the present utility model,
figure 7 is a schematic diagram of a serpentine resistor in perspective,
figure 8 is a schematic diagram of a serpentine resistor in elevation,
figure 9 is a schematic top view of a serpentine resistor,
figure 10 is a schematic side view of a serpentine resistor,
figure 11 is an enlarged schematic view of a portion of figure 9,
figure 12 is an enlarged schematic view of part B of figure 10,
figure 13 is a schematic view of a three-dimensional structure of a crowbar resistor,
figure 14 is a schematic elevational view of a crowbar resistor,
figure 15 is a schematic top view of a crowbar resistor,
figure 16 is a schematic side view of a crowbar resistor,
figure 17 is a schematic diagram of the three-dimensional structure of the bottom plate,
figure 18 is a schematic view of a top plate in perspective,
figure 19 is a schematic view of a side plate in a three-dimensional structure,
figure 20 is a schematic perspective view of the side plate after being disassembled,
figure 21 is a schematic diagram of a serpentine resistor and side plate mounting connection,
figure 22 is an enlarged schematic view of part of C of figure 21,
figure 23 is a schematic view of the three-dimensional structure of the crowbar resistor when it is initially installed,
fig. 24 is a schematic view of a three-dimensional structure of the crowbar resistor when it is initially installed in place.
In the figure: 1-serpentine resistor, 11-resistor band, 12-mounting hole, 13-connecting plate and 14-connecting hole; 2-shell, 21-bottom plate, 211-side plate connecting screw holes, 212-mounting holes, 22-side plate, 221-plate frame, 222-outer plate, 223-partition plate, 224-inner plate, 225-handle, 226-notch, 227-guide rail, 228-spacing layer, 23-top plate and 231-heat dissipation hole; 3-self-plugging rivet, 31-rivet head, 32-rivet tail; 4-mounting plates, 41-guide grooves and 42-positioning holes; 5, a mold; 6-a hydraulic cylinder. R1-inner bending radius, R2-central bending radius, R3-outer bending radius, deltaL-laminated resistance band sliding distance, d-mounting hole diameter, h 1-resistance band thickness, h 1/2-resistance band thickness half, h 2-connection plate thickness, h 3-spacer thickness, h 4-rivet tail thickness, K1-resistance band width, K2-connection plate width.
Detailed Description
The utility model is further described below by means of specific embodiments in connection with the accompanying drawings:
the prior art serpentine resistor bending is shown in fig. 1 to 3: three cylindrical dies 5 are adopted for bending, wherein two dies 5 are fixedly arranged at intervals, the other die 5 is arranged on a central line between the two fixed dies 5, and the hydraulic cylinder 6 drives the dies to move along the central line, so that a resistor belt 11 clamped between the dies 5 is pressed to form a U-shaped bend. During bending, the surface of the resistor tape 11 outside the U-bend is subjected to greater stress and strain. If the resistive band thickness h1 is thicker and the bending radius R1 is smaller, the stress and strain of the outer surface of the resistive band 11 will exceed the allowable stress and strain of the material, and will cause cracking or even breaking of the outer surface of the resistive band 11. When the thickness h1 of the resistance belt is smaller than 6mm, the inner bending radius R1 is larger than or equal to the thickness h of the resistance belt; when the thickness h1 of the resistance tape is less than or equal to 6mm and less than or equal to 12mm, the inner bending radius R1=1.25×the thickness h1 of the resistance tape. Therefore, the bending radius is limited when the serpentine resistor is bent, so that the distance between the bent resistor strips 11 is wider, the structure of the serpentine resistor is not compact, and the power density of the serpentine resistor and the crowbar resistor is not large.
The serpentine resistor bending mode of the utility model is shown in fig. 4 to 6: by reducing the resistive strip thickness h1, the minimum allowable bending radius R1 and bending stress are reduced. And after the multiple layers of thinner resistance bands are overlapped, replacing the thicker resistance bands to reduce the thickness of each layer of resistance band. In this embodiment, the resistor tape 11 having a thickness h1 is replaced with two layers of resistor tape 11 having a thickness h 1/2. During bending, the relative sliding of the distance DeltaL can be generated between the two layers of resistance bands, so that bending strain and bending stress of the outer resistance bands 11 during bending are reduced. In this way, the serpentine resistor is bent from the laminated resistor strip, and the resistor strip 11 is prevented from cracking during bending. Therefore, the smaller bending radius R1 can be bent to reduce the distance between the bent resistance bands 11, so that the serpentine resistor has a compact structure, and the power densities of the serpentine resistor and the crowbar resistor are improved.
The serpentine resistor 1 bent by the method of the present utility model is shown in fig. 7 to 12: from two superimposed resistive strips 11, a serpentine shape is formed with a plurality of consecutive U-turns. The U-shaped bent bottoms of the serpentine resistor 1 are provided with mounting holes 12. The inlet end and the outlet end of the snake-shaped resistor 1 are provided with a connecting plate 13, and the connecting plate 13 is provided with a connecting hole 14; the thickness h2 of the connecting plate is not smaller than the thickness h1 of the snake-shaped resistor; meanwhile, the width K1 of the resistance band is not less than 1.5 times and the width K2 of the connecting plate is not less than 3 times, and the width K1 of the resistance band is not more than 3 times; the connecting plate 13 adopts copper bars to reduce the connection resistance and the heating value of the connection part, protect the client cables and ensure reliable connection. The connecting plate 13 is connected with the inlet end and the outlet end of the snake-shaped resistor 1 in an offset way, one side of the connecting plate 13 is flush with one side of the snake-shaped resistor 1, so that after the installation, the gap between the connecting plate 13 and the shell 2 is the same as the gap between the snake-shaped resistor 1 and the shell 2, the same creepage distance is ensured, and the safety is ensured.
The crowbar resistor 1 of the present utility model is shown in fig. 13 to 16: comprising a shell 2 and a snake-shaped resistor 1 arranged in the shell 2. The housing 2 includes a bottom plate 21, side plates 22, and a top plate 23.
Because rigidity of the resistance belt 11 along the width direction is far greater than rigidity along the thickness direction, the serpentine resistor 1 is vertically arranged between the two side plates 22 in the shell 2 along the width direction of the resistance belt 11, and each U-shaped bent part of the serpentine resistor 1 is connected with the side plate 22 by adopting the self-plugging rivet 3 so as to improve overall rigidity and anti-seismic performance of the crowbar resistor. The plurality of serpentine resistors 1 are vertically arranged between two side plates 22 in the shell 2 in a layered manner, and each layer of serpentine resistor 1 is connected in series or in parallel from beginning to end. Each layer of serpentine resistor 1 is aligned in a vertical direction. The gaps between the resistive strips 11 are formed as air convection channels to improve heat dissipation efficiency.
As shown in fig. 17: the bottom plate 21 is U-shaped, and two sides of the bottom plate 21 are provided with side plate connecting screw holes 211 for connecting with the side plates 22. The front and rear ends of the base plate 21 are provided with mounting holes 212 for locking the base plate 21 to the mounting plate.
As shown in fig. 18: the top plate 23 is U-shaped, and screw holes are formed in two sides of the top plate; the top plate 23 is inversely fastened to the side plates 22 on both sides, and is connected to the side plates 22 by screws. The top plate 23 is provided with heat dissipation holes 231 arranged in a matrix form to form convection channels, thereby improving heat dissipation efficiency.
As shown in fig. 19 to 20: the side plate 22 is composed of a side plate frame 221, an outer side plate 222, a partition plate 223 and an inner side plate 224 which are assembled in sequence, and the outer side plate 222, the partition plate 223 and the inner side plate 224 are all mica plates with excellent high-temperature resistant insulating performance. A spacer 223 is used to form a spacer 228 between the outer panel 222 and the inner panel 224 for receiving a connector. The outer side plate 222 plays a role in insulating heat, the partition 223 plays a role in preventing the rivet tail 32 from damaging the outer side plate 222, and the inner side plate 224 is used for installing the serpentine resistor 1. The composite side plate which seals the exposed connecting piece on the spacing layer 228 ensures the insulation performance of the shell 2, ensures the safety and ensures the smoothness and the beautiful appearance of the shell.
The lower edge of the outer side of the side plate frame 221 is provided with a guide rail 227, so that a push-pull installation mode is convenient to use, the installation is simple, convenient and quick, and the installation efficiency is high. The front end of the side plate frame 221 is provided with a notch 226 to avoid the frame 221 from blocking push-pull installation. The front end of the side plate frame 221 is provided with a handle 225 to facilitate push-pull operation.
As shown in fig. 21 to 22: the snake-shaped resistor 1 is connected to the inner side plate 224 by the self-plugging rivet 3, so that the installation is simple and convenient, the installation efficiency is high, and the rivet joint can not loosen like a threaded connection during vibration, so that the shock resistance is excellent. The rivet tail 32 is located within the standoff layer 228. Because the thickness h4 of the rivet tail is smaller than the thickness of the nut, the thickness h3 of the spacer layer can be reduced, the external dimension of the shell 2 can be reduced, or the creepage distance between the rivet tail 32 and the outer side plate 222 can be increased, so that the insulation performance can be further improved.
As shown in fig. 23 to 24: the mounting plate 4 is provided with a plurality of parallel guide grooves 41 and positioning holes 42. The guide rail 227 of the crow bar resistor is matched with the guide groove 41 on the mounting plate 4, the crow bar resistor is mounted on the mounting plate 4 in a push-pull mode, and the crow bar resistor is locked by a locking screw through the mounting hole 212 on the bottom plate 21 and the positioning hole 42 screwed into the mounting plate 4. The push-pull mounting mode is simple, convenient and quick to mount, and improves the mounting efficiency.
To sum up: the beneficial effects of the utility model are as follows: the serpentine resistor bending method of the utility model comprises the following steps: and a mode of bending after overlapping the multi-layer resistance bands is adopted. During bending, the resistance bands of different layers can slide relatively, so that bending strain and bending stress of the outer resistance bands during bending are reduced. To reduce the minimum allowable bending radius and bending stress, thereby reducing the spacing between the resistive bands, making the serpentine resistor more compact to increase the power density of the serpentine resistor. The crowbar resistor is a serpentine resistor bent by a laminated resistor band and is arranged on a composite side plate with a spacing layer. The high-voltage power supply has the characteristics of compact structure, high power density, good insulating property, good earthquake resistance, safety and reliability.
The above embodiments are only for illustrating the present utility model, not for limiting the present utility model, and various changes and modifications may be made by one skilled in the relevant art without departing from the spirit and scope of the present utility model, so that all equivalent technical solutions shall fall within the scope of the present utility model, which is defined by the claims.
Claims (6)
1. A method of bending a serpentine resistor from a resistive band into a serpentine having a plurality of continuous U-turns, comprising: three cylindrical dies (5) are adopted for bending, wherein two dies (5) are fixedly arranged at intervals, the other die (5) is arranged on a central line between the two fixed dies (5), and is driven by a hydraulic cylinder (6) to move along the central line, so that a resistor belt (11) clamped in the middle of the dies (5) is pressed to form a U-shaped bend, and the minimum allowable bending radius and bending stress are reduced by reducing the thickness of the resistor belt, so that cracks are avoided when a snake-shaped resistor is bent; overlapping the multiple layers of thinner resistance bands to replace the thicker resistance bands so as to reduce the thickness of the resistance bands; in the bending process, the resistance bands of different layers can slide relatively, so that bending strain and bending stress of the outer resistance bands in bending are reduced; the mode of bending the snake-shaped resistor by the laminated resistor belt can avoid cracks of the resistor belt during bending, so that the smaller bending radius can be bent, the distance between the bent resistor belts is reduced, the structure of the snake-shaped resistor is compact, and the power density of the snake-shaped resistor and the crowbar resistor is improved.
2. A crowbar resistor for implementing the serpentine resistor bending method of claim 1, comprising: casing (2) and set up the resistance in casing (2), its characterized in that: the resistor is a snake-shaped resistor (1) bent by adopting a snake-shaped resistor bending method; the U-shaped bent bottoms of the serpentine resistor (1) are provided with mounting holes (12), and the serpentine resistor (1) is vertically arranged between two side plates (22) in the shell (2) according to the width direction; the housing (2) comprises: a bottom plate (21), side plates (22), and a top plate (23); the side plate (22) is formed by assembling a side plate frame (221), an outer side plate (222), a partition plate (223) and an inner side plate (224) in sequence, wherein the outer side plate (222), the partition plate (223) and the inner side plate (224) are made of insulating materials, and a space layer (228) for accommodating connecting pieces is formed between the outer side plate (222) and the inner side plate (224) by the partition plate (223); adopt self-plugging rivet (3) to connect snakelike resistance (1) on interior curb plate (224), rivet tail (32) are in separate in empty layer (228), and rivet tail thickness (h 4) are less than nut thickness, reduce separate empty layer thickness (h 3), reduce casing (2) overall dimension, increase the creepage distance between rivet tail (32) and lateral plate (222), further improve insulating properties.
3. The crowbar resistor of claim 2, wherein: a plurality of snake-shaped resistors (1) are connected in series, a connecting plate (13) is arranged at the inlet end and the outlet end of each snake-shaped resistor (1), and a connecting hole (14) is formed in the connecting plate (13); the thickness (h 2) of the connecting plate is not smaller than the thickness (h 1) of the snake-shaped resistor; 1.5 times of resistor band width (K1) is less than or equal to the width (K2) of the connecting plate and less than or equal to 3 times of resistor band width (K1); the connecting plate (13) is connected with the inlet and outlet ends of the serpentine resistor (1) in an offset manner.
4. A crowbar resistor as claimed in claim 3, wherein: the lower side of the outer side of the side plate frame (221) is provided with a guide rail (227).
5. The crowbar resistor of claim 4, wherein: the device also comprises a mounting plate (4) provided with a guide groove (41) and a positioning hole (42).
6. The crowbar resistor of claim 5, wherein: the crowbar resistor is mounted on the mounting plate (4) in a push-pull manner through the cooperation of the guide rail (227) and the guide groove (41) on the mounting plate (4), and is locked by a locking screw penetrating through the mounting hole (212) on the bottom plate (21) and being screwed into the positioning hole (42) of the mounting plate (4).
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