CN114388208A - Snake-shaped resistor bending method and crowbar resistor - Google Patents
Snake-shaped resistor bending method and crowbar resistor Download PDFInfo
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- CN114388208A CN114388208A CN202210107758.XA CN202210107758A CN114388208A CN 114388208 A CN114388208 A CN 114388208A CN 202210107758 A CN202210107758 A CN 202210107758A CN 114388208 A CN114388208 A CN 114388208A
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- 238000005452 bending Methods 0.000 title claims abstract description 72
- 238000000034 method Methods 0.000 title claims abstract description 22
- 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 58
- 238000009434 installation Methods 0.000 claims description 16
- 238000005192 partition Methods 0.000 claims description 10
- 230000008569 process Effects 0.000 claims description 5
- 239000011810 insulating material Substances 0.000 claims description 2
- 239000002131 composite material Substances 0.000 abstract description 5
- 238000010248 power generation Methods 0.000 description 10
- 238000010586 diagram Methods 0.000 description 7
- 229910052573 porcelain Inorganic materials 0.000 description 7
- 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 4
- 238000003466 welding Methods 0.000 description 4
- 239000003990 capacitor Substances 0.000 description 3
- 239000000463 material Substances 0.000 description 3
- 230000009286 beneficial effect Effects 0.000 description 2
- 230000008878 coupling Effects 0.000 description 2
- 238000010168 coupling process Methods 0.000 description 2
- 238000005859 coupling reaction Methods 0.000 description 2
- 238000005336 cracking Methods 0.000 description 2
- 230000000694 effects Effects 0.000 description 2
- 238000002955 isolation Methods 0.000 description 2
- RYGMFSIKBFXOCR-UHFFFAOYSA-N Copper Chemical compound [Cu] RYGMFSIKBFXOCR-UHFFFAOYSA-N 0.000 description 1
- 230000002411 adverse Effects 0.000 description 1
- 230000000903 blocking effect Effects 0.000 description 1
- 230000008859 change Effects 0.000 description 1
- 238000010276 construction Methods 0.000 description 1
- 229910052802 copper Inorganic materials 0.000 description 1
- 239000010949 copper Substances 0.000 description 1
- 230000007547 defect Effects 0.000 description 1
- 230000007613 environmental effect Effects 0.000 description 1
- 239000011159 matrix material Substances 0.000 description 1
- 239000010445 mica Substances 0.000 description 1
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- 238000012544 monitoring process Methods 0.000 description 1
- 238000000465 moulding Methods 0.000 description 1
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- 125000006850 spacer group Chemical group 0.000 description 1
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- H01C17/04—Apparatus or processes specially adapted for manufacturing resistors adapted for winding the resistive element
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- H—ELECTRICITY
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- 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
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Abstract
The utility model discloses a serpentine resistor bending method, which comprises the following steps: and a mode of folding and then bending a plurality of layers of resistance bands is adopted. When the outer resistance belt is bent, the resistance belts of different layers can slide relatively, so that the bending strain and the bending stress of the outer resistance belt are reduced. So as to reduce the minimum allowable bending radius and bending stress, thereby reducing the distance between the resistance bands, and enabling the serpentine resistance to be more compact so as to improve the power density of the serpentine resistance. The utility model also discloses a crowbar resistor: the serpentine resistor is formed by bending a laminated resistor band and is arranged on a composite side plate with a spacing layer. The high-power-density cable has the characteristics of compact structure, high power density, good insulating property, good seismic performance, 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, all countries around the world are in great development of renewable energy career such as wind power generation, solar power generation and the like. With the rapid development of wind power, the installed capacity is rapidly increased, and the proportion of wind power generation in the power supply of a power grid is continuously increased, so that the grid connection quality and the operation state of a wind generating set are of great importance to the stability of the power grid. During operation, a grid fault may cause a voltage drop, which may cause a series of transient processes to the wind power plant, such as an overvoltage, an overcurrent, or a speed increase.
The disconnection of a large number of wind driven generators caused by the grid voltage drop fault can cause the great change of the power flow of a power system and even cause the problem of frequency stability caused by large-area power failure. Therefore, a Low Voltage Ride Through (LVRT) technique of a wind power plant is presented, namely: when the voltage of the power grid drops, the wind power generation equipment can be kept connected to the power grid within a voltage drop set value and set time, and the voltage of the power grid is recovered until the power grid is recovered to be normal. The wind power generation equipment can maintain the stability of the wind field power grid only by adopting effective LVRT measures.
In order to realize the LVRT function, a low-voltage bypass system is generally adopted in the existing wind power generation equipment, that is, an active crowbar technology is adopted on the rotor side. The commonly used active Crowbar technology comprises an Insulated Gate Bipolar power Transistor (IGBT) type Crowbar circuit, a hybrid bridge type Crowbar circuit, a Crowbar circuit with a bypass resistor and the like, and the active Crowbar technology shunts the currents of a rotor and a frequency converter through a bypass when the voltage of a power grid drops, so that the influence of overcurrent can be avoided, a wind generating set can not be disconnected from the power grid, and the LVRT function is realized.
The crowbar technology requires the adoption of a crowbar resistor to convert redundant electric energy into heat energy, and the heat energy is dissipated into air through convection. The crowbar resistor is arranged densely in an array mode by adopting the resistor disc or the resistor belt, so that larger resistors are contained in the crowbar resistor in unit volume, the power density of the crowbar resistor is improved greatly, and meanwhile, the resistor disc or the resistor belt is guaranteed to have a heat dissipation clearance.
In the case of a crowbar resistor made of a resistive strip, the resistive strip may be bent into a serpentine shape having a continuous U-bend. In order to increase the power density of the crowbar resistor, the distance between the resistor strips should be reduced as much as possible, so that a smaller bending radius is required. However, when the bending radius is smaller than the maximum bending radius allowed by the material, the resistance band can crack or even break. Therefore, the technical problem to be solved for manufacturing the serpentine resistor and the crowbar resistor is to prevent the serpentine resistor from cracking in the bending process.
Meanwhile, the existing crowbar resistor is formed by assembling a resistor disc and a porcelain insulator together by adopting a string rod (a screw rod). Due to the fact that the anti-seismic performance of the porcelain insulator is not ideal, when strong wind causes large vibration and impact of the wind turbine generator, the porcelain insulator can break or even fall off, short circuit is caused, and safety accidents are caused. And the existing crowbar resistor has the advantages of multiple parts, complex structure, high production cost and low production efficiency.
Through patent retrieval, the following patents mainly exist, which have a certain relationship with the utility model:
1. the utility model provides a method and a device for detecting crowbar circuits in a wind turbine generator, wherein the wind turbine generator comprises a current transformer electrically connected to the crowbar circuits, and the device comprises the following components: electrically coupling a detection module to the crowbar circuit; inputting a first control signal to the crowbar circuit to start the crowbar circuit; providing three-phase voltage signals to the crowbar circuit through a current transformer, wherein the interval between the adjacent two-phase voltage signals is a preset phase angle; reading a first detection signal output by the detection module to judge whether the crowbar circuit is normally put into use; 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 off. Compared with the prior art, the crowbar circuit protection method can rapidly judge whether the crowbar circuit can be normally switched or not, and can reduce the possible damage of the converter caused by the crowbar circuit to the minimum degree, thereby effectively protecting core devices of the wind power system. The patent does not relate to a specific structure of the crowbar resistor.
2. Chinese invention patent with application number "201310101434.6", application date "2013.03.27", publication number "CN 103368493A", publication number "2013.10.23", name "improved hard precharge for parallel inverter", and application name "alstonian traffic equipment limited", this invention patent relates to an improved hard precharge for parallel inverters, each controlled by 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, isolation switches 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 through a filter capacitor bank and a device for pre-charging the capacitor bank, the pre-charging device comprising a crowbar resistor and an automatic power switch which transmits a DC power signal to the crowbar resistor when the voltage exceeds a predetermined threshold. The utility model provides means for alternately closing the isolation switches 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. The patent also does not relate to a specific structure of the crowbar resistor.
3. The utility model relates to a low-voltage ride through controlling means and wind power generation equipment, the utility model relates to a utility model of "CN 200920247136.7", application date is "2009.11.18", publication number is "CN 201570870U", publication date is "2010.09.01", the name is "low-voltage ride through controlling means and wind power generation equipment", the applicant is "Huarui wind power technology (group) division of companies limited. The control device includes: the crowbar protection circuit 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, and the shunt circuit is used for shunt protection of a frequency converter group; under the closed state of the thyristor, the stator circuit breaker is controlled to be disconnected, and then the crowbar protection circuit breaker is controlled to complete the operation of disconnection and reclosing; and controlling the stator circuit breaker to be closed when the voltage value of the power grid is monitored to be equal to or larger than the set threshold value. The utility model discloses a low-voltage ride through function has been realized with simple structure, and can avoid absorbing reactive power from the electric wire netting and cause the undulant adverse effect of electric wire netting. This patent also does not relate to the specific construction of the crowbar resistor.
4. The utility model has the application number of 'CN201120085060. X', the application date of '2011.03.28', the publication number of 'CN 202058525U', the publication number of '2011.11.30', the name of 'wind power brake resistor', the applicant is ' Yongbo City Jiujiu electronic Limited' practical novel patent, the wind power brake resistor is installed in a wind power generation system, redundant electric power is converted into heat energy and dissipated when a wind power generator brakes, the wind power brake resistor comprises a shell, wherein, the wind power brake resistor also comprises a plurality of resistance sheet unit layers which are positioned in the shell and are sequentially arranged from top to bottom, each resistance sheet unit layer comprises a front screw rod, a rear screw rod, a plurality of insulating porcelain pieces which are sleeved on the front screw rod and the rear screw rod, and a plurality of resistance sheets which are sequentially arranged from left to right, the two ends of the front screw rod and the rear screw rod are fixed on the shell through insulating pieces, the resistance sheets are connected in an end-to-end welding way, welding positions among the resistance sheets are alternately sleeved on the rear screw rod and the front screw rod, the insulating porcelain insulator is distributed between adjacent welding positions, and the resistance sheet unit layers are mutually connected in series and electrically. The utility model effectively increases the resistance material to meet the performance requirement of large through-flow and high power under the condition of ensuring the volume of the original shell, and simultaneously ensures the heat dissipation effect. However, the screw 3 and the insulating porcelain 2 are connected in series to form the resistance card 6, and two ends of the resistance card 6 are welded, so that the structure is complex, a plurality of parts are needed, a plurality of processes are needed, and the cost is high.
5. The utility model discloses a utility model patent of application number "202022199132.5", application date "2020.09.29", publication number "CN 213935796U", publication number "2021.08.10", name "a kind of band resistor", applicant for "guangdong ford electronics limited company", this utility model's a band resistor, including curb plate, boom, retaining member, flat resistance area and a plurality of insulating holders, the middle part of a plurality of insulating holders is opened has the connecting hole, the boom passes the connecting hole of a plurality of insulating holders to arrange a plurality of insulating holders and bunch; the two sides of the insulating bases in the arrangement direction are provided with limiting grooves, the resistance band continuously bends to pass through the space between every two adjacent insulating bases, the narrow surfaces of all sections of the resistance band are respectively embedded into the limiting grooves of the two adjacent insulating bases, the wide surface of the flat resistance band faces to the direction perpendicular to the arrangement direction of the insulating bases, namely the narrow surfaces between the two adjacent sections of the same resistance band face to each other, and the wide surfaces face to each other in parallel. However, the serpentine resistance band is manufactured by welding, rather than by 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 technical scheme adopted by the utility model is as follows: a serpentine resistor bending method bends a serpentine resistor having a plurality of continuous U-bends from a resistor strip. The distance between the resistance bands is reduced by reducing the thickness of the resistance bands so as to reduce the minimum allowable bending radius and bending stress, so that the serpentine resistance is more compact, and the power density of the serpentine resistance is improved.
Furthermore, after a plurality of layers of thinner resistance tapes are overlapped, the thicker resistance tapes are replaced to reduce the thickness of the resistance tapes; in the bending process, the resistance bands of different layers can slide relatively, so that the bending strain and the bending stress of the outer resistance band during bending are reduced. The mode of bending the serpentine resistor by the laminated resistor band can avoid cracks during bending.
The utility model also relates to a crowbar resistor comprising: casing and the resistance of setting in the casing. 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.
Furthermore, the U-shaped bent bottom of the S-shaped resistor is provided with a mounting hole, and the S-shaped resistor is vertically arranged between two side plates in the shell according to the width direction. So as to improve the integral rigidity and the anti-seismic performance of the crowbar resistor. Because snakelike resistance adopts screw or rivet direct mount on insulating curb plate, simple structure, simple installation, production efficiency are high, with low costs, do not adopt breakable porcelain insulator moreover, have excellent anti-seismic performance.
Furthermore, a plurality of serpentine resistors are connected in series, and the inlet and outlet ends of the serpentine resistors are provided with connecting plates which are provided with connecting holes; the thickness of the connecting plate is not less than that of the snake-shaped resistor; the width of the resistance strip is not less than 1.5 times and not more than 3 times; the connecting plate is connected with the inlet end and the outlet end of the snake-shaped 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, a side plate 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, the outer side plate, the partition plate and the inner side plate are made of insulating materials, and a separation layer used for accommodating the connecting piece is formed between the outer side plate and the inner side plate through the partition plate. The exposed connecting piece is sealed in the hollow layer of the composite side plate, so that the insulating property of the shell is ensured, the safety is ensured, and the shell is smooth and attractive.
Furthermore, the snake-shaped resistor is connected to the inner side plate by the self-plugging rivet, and the rivet tail is positioned in the spacing layer. Because rivet tail thickness is less than nut thickness, consequently can reduce and separate empty layer thickness, reduce casing overall dimension, or increase the creepage distance between rivet tail and the outer panel, further improve insulating properties.
Further, a guide rail is arranged at the lower edge of the outer side of the side plate frame.
Further, still including being provided with the mounting panel of guide slot and locating hole.
Furthermore, the crowbar resistor is installed on the installation plate in a push-pull mode through the matching of the guide rail and the guide groove on the installation plate, and a locking screw penetrates through an installation hole in the bottom plate and is screwed into a positioning hole of the installation plate for locking. And a push-pull mounting mode is adopted, so that the installation is simple, convenient and quick, and the installation efficiency is improved.
The utility model has the beneficial effects that: the serpentine resistor bending method comprises the following steps: and a mode of folding and then bending a plurality of layers of resistance bands is adopted. When the outer resistance belt is bent, the resistance belts of different layers can slide relatively, so that the bending strain and the bending stress of the outer resistance belt are reduced. So as to reduce the minimum allowable bending radius and bending stress, thereby reducing the distance between the resistance bands, and enabling the serpentine resistance to be more compact so as to improve the power density of the serpentine resistance. The crowbar resistor adopts a serpentine resistor which is bent by a laminated resistor belt and is arranged on a composite side plate with a spacing layer. The high-power-density cable has the characteristics of compact structure, high power density, good insulating property, good seismic performance, safety and reliability.
Drawings
Figure 1 is a schematic diagram of a conventional resistive band bending U-bend,
FIG. 2 is a schematic diagram of a conventional U-bend formed by bending a resistive band,
figure 3 is a third schematic diagram of a conventional resistance band bending U-bend,
figure 4 is a first schematic view of the bending U-bend of the resistive strip of the present application,
figure 5 is a schematic diagram of a resistance band bending U-bend of the present application,
figure 6 is a third schematic view of the bending U-bend of the resistive band of the present application,
figure 7 is a schematic diagram of a three-dimensional structure of a serpentine resistor,
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 side view schematic of a serpentine resistor,
figure 11 is an enlarged view of a portion of figure 9,
figure 12 is an enlarged view of part B of figure 10,
figure 13 is a schematic perspective view of a crowbar resistor,
FIG. 14 is a schematic diagram of a crowbar resistor in front view,
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 perspective view of the bottom plate,
figure 18 is a schematic perspective view of the top plate,
figure 19 is a schematic perspective view of the side plate,
figure 20 is a perspective view of the disassembled side plate,
figure 21 is a schematic view of the serpentine resistors in connection with the side plate mounting,
figure 22 is an enlarged view of portion C of figure 21,
figure 23 is a schematic perspective view of the installation of the crowbar resistor,
fig. 24 is a schematic perspective view of the crowbar resistor when it is initially installed in place.
In the figure: 1-snake-shaped resistor, 11-resistor band, 12-mounting hole, 13-connecting plate, 14-connecting hole; 2-shell, 21-bottom plate, 211-side plate connecting screw hole, 212-mounting hole, 22-side plate, 221-plate frame, 222-outer plate, 223-partition plate, 224-inner plate, 225-handle, 226-gap, 227-guide rail, 228-spacing layer, 23-top plate, 231-heat radiation hole; 3-self-plugging rivet, 31-rivet head, 32-rivet tail; 4-mounting plate, 41-guide groove, 42-locating hole; 5, molding; 6, a hydraulic cylinder. R1-inner side bending radius, R2-center line bending radius, R3-outer side bending radius, Delta L-sliding distance of laminated resistance bands, d-diameter of mounting hole, h 1-thickness of resistance band, h 1/2-half thickness of resistance band, h 2-thickness of connecting plate, h 3-thickness of spacing layer, h 4-thickness of rivet tail, K1-width of resistance band and K2-width of connecting plate.
Detailed Description
The utility model is further described by the following specific embodiments in conjunction with the attached drawings:
the existing serpentine resistor bending method 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 center line between the two fixed dies 5 and is driven by a hydraulic cylinder 6 to move along the center line, and thus a resistance belt 11 clamped in the middle of the dies 5 is pressed to form a U-shaped bend. During bending, the surface of the resistive strip 11 that is outside the U-bend is subjected to greater stress and strain. If the thickness h1 of the resistive strip is thick and the bending radius R1 is small, the stress and strain on the outer surface of the resistive strip 11 will exceed the allowable stress and strain of the material, which will cause the outer surface of the resistive strip 11 to crack or even break. When the thickness h1 of the resistance band is less than 6mm, the bending radius R1 of the inner side is more than or equal to the thickness h of the resistance band; and when the thickness h1 of the resistance band is not less than 6mm and not more than 12mm, the inner bending radius R1=1.25 multiplied by the thickness h1 of the resistance band. Therefore, the bending radius is limited when the serpentine resistor is bent, so that the distance between the bent resistor bands 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 high.
The serpentine resistance bending mode of the utility model is shown in fig. 4 to 6: by reducing the thickness h1 of the resistance band, the minimum allowable bending radius R1 and bending stress are reduced. After multiple layers of thinner resistance tapes are laminated, the thicker resistance tapes are replaced to reduce the thickness of each layer of resistance tape. In this embodiment resistive strip 11 having a thickness of h1 is replaced by two layers of resistive strip 11 having a thickness of h 1/2. During bending, the two layers of resistance bands can slide relatively by the distance Δ L, so that bending strain and bending stress during bending of the outer resistance band 11 are reduced. The serpentine resistor is bent from the laminated resistor strip, so that the resistor strip 11 is prevented from cracking during bending. Therefore, the resistance band can be bent to a smaller bending radius R1 to reduce the distance between the bent resistance bands 11, so that the serpentine resistance structure is compact, and the power density of the serpentine resistance and the crowbar resistance is improved.
The serpentine resistor 1 bent by the method of the utility model is shown in figures 7 to 12: a serpentine shape with a plurality of successive U-bends is made from two superimposed resistive strips 11. The U-shaped bent bottom of the serpentine resistor 1 is provided with mounting holes 12. The inlet and outlet ends of the snake-shaped resistor 1 are provided with connecting plates 13, and the connecting plates 13 are provided with connecting holes 14; the thickness h2 of the connecting plate is not less than the thickness h1 of the serpentine 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 less than 3 times; the connecting plate 13 adopts the copper bar to reduce the calorific capacity of connecting resistance and junction, protect the customer's cable, ensure reliable connection. The connecting plate 13 is connected with the business turn over end biasing of serpentine resistance 1, and one side of connecting plate 13 flushes with one side of serpentine resistance 1 for the clearance between connecting plate 13 and casing 2 is the same with the clearance between serpentine resistance 1 and the casing 2 after the installation, in order to guarantee to have the same creepage distance, ensures safety.
The crowbar resistance 1 of the present invention is shown in fig. 13 to 16: comprises a shell 2 and a serpentine resistor 1 arranged in the shell 2. The housing 2 includes a bottom plate 21, side plates 22, and a top plate 23.
Because the rigidity of resistance area 11 along width direction is far greater than along the rigidity of thickness direction, consequently serpentine resistance 1 is installed between two blocks of curb plates 22 in casing 2 along the vertical according to the width direction of resistance area 11, and every U-shaped bight of serpentine resistance 1 all adopts self-plugging rivet 3 to be connected with curb plate 22 to improve the bulk rigidity and the anti-seismic performance of crowbar resistance. A plurality of serpentine resistors 1 are arranged between two side plates 22 in the shell 2 in a vertical layered mode, and the serpentine resistors 1 in each layer are connected in series or in parallel end to end. Each layer of serpentine resistors 1 is aligned vertically. The gaps between the resistive tapes 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 side plate coupling screw holes 211 are formed at both sides of the bottom plate 21 to couple 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 turned over the side plates 22 at both sides and connected with the side plates 22 by screws. The heat dissipation holes 231 arranged in a matrix are formed in the top plate 23 to form a convection channel, thereby improving the heat dissipation efficiency.
As shown in fig. 19 to 20: 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, and the outer side plate 222, the partition plate 223 and the inner side plate 224 are all made of mica plates with excellent high-temperature-resistant insulating performance. A spacer 223 is used to form a space 228 between the outer plate 222 and the inner plate 224 for receiving a connector. The outer plate 222 serves as an insulating and heat-insulating function, the partition 223 serves as a function of preventing the rivet tail 32 from damaging the outer plate 222, and the inner plate 224 serves as a function of mounting the serpentine resistor 1. The composite side plate which seals the exposed connecting piece in the spacing layer 228 not only ensures the insulating property of the shell 2 and the safety, but also makes the shell flat and beautiful.
The guide rail 227 is arranged at the lower edge of the outer side of the side plate frame 221, so that a push-pull mounting mode is convenient to adopt, the mounting is simple, convenient and fast, and the mounting efficiency is high. The front end of the side plate frame 221 is provided with a notch 226 to prevent the frame 221 from blocking the push-pull installation. The front end of the side plate frame 221 is provided with a handle 225 for easy push-pull operation.
As shown in fig. 21 to 22: the self-plugging rivet 3 is adopted to connect the serpentine resistor 1 to the inner side plate 224, so that the mounting is simple and convenient, the mounting efficiency is high, the phenomenon that the serpentine resistor is loosened in a riveting mode during vibration like a threaded connection mode is avoided, and the self-plugging type self-plugging device has excellent anti-seismic performance. The rivet tail 32 is within the standoff layer 228. Because rivet tail thickness h4 is less than nut thickness, consequently can reduce apart empty layer thickness h3, reduce casing 2 overall dimension, or increase the creepage distance between rivet tail 32 and outer panel 222, further improve insulating properties.
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 crowbar resistor is matched with the guide groove 41 on the mounting plate 4, the crowbar resistor is mounted on the mounting plate 4 in a push-pull mode, and a locking screw penetrates through the mounting hole 212 on the bottom plate 21 and is screwed into the positioning hole 42 of the mounting plate 4 to be locked. The push-pull installation mode is simple, convenient and quick to install and improves the installation efficiency.
In summary, the following steps: the utility model has the beneficial effects that: the serpentine resistor bending method comprises the following steps: and a mode of folding and then bending a plurality of layers of resistance bands is adopted. When the outer resistance belt is bent, the resistance belts of different layers can slide relatively, so that the bending strain and the bending stress of the outer resistance belt are reduced. So as to reduce the minimum allowable bending radius and bending stress, thereby reducing the distance between the resistance bands, and enabling the serpentine resistance to be more compact so as to improve the power density of the serpentine resistance. The crowbar resistor adopts a serpentine resistor which is bent by a laminated resistor belt and is arranged on a composite side plate with a spacing layer. The high-power-density cable has the characteristics of compact structure, high power density, good insulating property, good seismic performance, safety and reliability.
The above embodiments are provided for illustrative purposes only and not for limiting the present invention, and those skilled in the art can make various changes and modifications without departing from the spirit and scope of the present invention, and therefore all equivalent technical solutions should fall within the scope of the present invention, and the scope of the present invention should be defined by the claims.
Claims (10)
1. A method of bending a serpentine-shaped resistor from a resistor strip into a serpentine shape having a plurality of successive U-bends, comprising: the minimum allowable bending radius and bending stress are reduced by reducing the thickness of the resistor belt, so that cracks are avoided when the serpentine resistor is bent.
2. The serpentine resistance bending method according to claim 1, wherein: after the plurality of layers of thinner resistance bands are overlapped, the thicker resistance bands are replaced to reduce the thickness of the resistance bands; in the bending process, the resistance bands of different layers can slide relatively, so that the bending strain and the bending stress of the outer resistance band during bending are reduced.
3. A crowbar resistor comprising: casing (2) and the resistance of setting in casing (2), its characterized in that: the resistance is a serpentine resistance (1) bent by the serpentine resistance bending method according to claim 1 or 2.
4. The crowbar resistor of claim 3, wherein: the U-shaped bent bottom of the S-shaped resistor (1) is provided with a mounting hole (12), and the S-shaped resistor (1) is vertically arranged between two side plates (22) in the shell (2) according to the width direction.
5. The crowbar resistor of claim 4, wherein: a plurality of snake-shaped resistors (1) are connected in series, connecting plates (13) are arranged at the inlet and outlet ends of the snake-shaped resistors (1), and connecting holes (14) are formed in the connecting plates (13); the thickness (h 2) of the connecting plate is not less than the thickness (h 1) of the serpentine resistor; 1.5 times the width (K1) of the resistor strip is more than or equal to the width (K2) of the connecting plate and more than or equal to 3 times the width (K1) of the resistor strip; the connecting plate (13) is connected with the inlet end and the outlet end of the snake-shaped resistor (1) in an offset way.
6. The crowbar resistor of claim 5, wherein: the housing (2) comprises: a bottom plate (21), a side plate (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, 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) used for accommodating a connecting piece is formed between the outer side plate (222) and the inner side plate (224) through the partition plate (223).
7. The crowbar resistor of claim 6, wherein: a self-plugging rivet (3) is adopted to connect the snake-shaped resistor (1) to the inner side plate (224), and a rivet tail (32) is positioned in the spacing layer (228).
8. The crowbar resistor of claim 7, wherein: the lower edge of the outer side of the side plate frame (221) is provided with a guide rail (227).
9. The crowbar resistor of claim 8, wherein: the device also comprises a mounting plate (4) provided with a guide groove (41) and a positioning hole (42).
10. The crowbar resistor of claim 9, wherein: the crowbar resistor is installed on the installation plate (4) in a push-pull mode through the matching of the guide rail (227) and the guide groove (41) on the installation plate (4), and a locking screw penetrates through an installation hole (212) on the bottom plate (21) and is screwed into a positioning hole (42) of the installation plate (4) to be locked.
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