Strip-shaped resistor disc used in circular resistor

Abstract

The utility model relates to a strip-shaped resistor disc used in a circular resistor, the strip-shaped resistor disc is a strip-shaped sheet resistor disc, the strip-shaped resistor disc comprises a strip-shaped body, and the strip-shaped body is provided with a bulge for locally deforming the resistor disc; the protrusions are continuous or discontinuous long-strip-shaped protrusions arranged in the length direction of the resistor disc, and the protruding heights of the long-strip-shaped protrusions on the surface of the protruding resistor disc are gradually-changed long-strip-shaped protrusions with different heights. According to the circular resistor disclosed by the utility model, through the strip-shaped bulges with different heights on the resistor discs, when the strip-shaped resistor discs used in the circular resistor are radially arranged on the circular resistor in the radial direction, the radiating gap channels among the resistor discs can form radiating channels with equal damping in the radial direction, so that equivalent radiating of the resistor discs in the radial direction is formed.

Description

Technical Field

[0001] The utility model relates to a strip-shaped resistor chip, in particular to a strip-shaped resistor chip used in a high-power circular resistor; the strip-shaped resistor chip used in the circular resistor can improve the heat dissipation condition of the high-power circular resistor; it belongs to the technical field of component manufacturing of large resistors. Background Technique

[0002] The resistor chip is the main heat dissipation device of the high-power circular resistor; moreover, the resistor chips are evenly distributed in a fan-shaped module along the radial direction of the high-power circular resistor inside the high-power circular resistor frame (the radial direction of the high-power circular resistor is the length direction of the resistor strip), forming a ring. An insulating part is inlaid between the resistor chip and the high-power circular resistor frame, and the insulating part is fixed on the inner and outer cylinders of the high-power circular resistor frame through bolts, and the resistor chips are evenly distributed between the inner and outer insulating parts. Since the current large high-power circular resistors are mainly used in harsh environments such as mining trucks, the high-power circular resistors are mainly used in mechanical systems for controlling the rapid parking of motors, helping the motors to convert the regenerative electric energy generated by their rapid parking into heat energy, and then using a fan to help the braking resistor dissipate heat. Since the current high-power circular resistors have a large diameter, their dimensions in the radial direction are also relatively large. For this kind of resistor chip arranged radially, due to its fan-shaped structure, as shown in the appendix Figure 1 The distance between the resistor strips near the center of the circle is significantly smaller than the distance between the resistor strips far from the center of the circle. Therefore, when the cooling air blown by the fan flows through the resistor strips, the wind resistance of the resistor strips near the center of the circle is much greater than that of the resistor strips far from the center of the circle. As a result, most of the cooling air will flow away through the gaps between the resistor strips far from the center of the circle. When the resistor is working, the temperature of the resistor strips near the center of the circle is much higher than that on the side far from the center of the circle due to the small amount of cooling air, which will cause uneven temperature distribution in the resistor for a long time, and the aging speed of the components in the high-temperature part is fast. In addition, the thermal stress difference of each part of the resistor is large, which will shorten the service life of the resistor; therefore, it is very necessary to improve this.

[0003] Through retrieval and query, it is found that there are similar literature reports, but there is no technical solution the same as that of this application; the ones most relevant to this application are as follows:

[0004] The patent application publication number is CN115862978A, and the invention patent with the title of "A Resistance Band Unit and a Sector Resistance Band Structure" discloses a sector resistance sheet unit. It also mentions the problem of uneven heat dissipation caused by different gaps in the radial direction of the resistance sheet. However, the proposed method is to add a filling section within a unit interval in the large-radius region in the radial direction of the sector resistance band, so that the sector resistance band not only maintains structural continuity but also makes the density of the resistance band in the large-radius region in the radial direction similar to that in the small-radius region in the radial direction, thereby achieving the effect of balanced resistance in the ventilation area within the sector resistance band. However, it is found in actual applications that this method not only has limited effects but also brings many troubles to the production of resistance sheets. It is necessary to add welding and fixing parts in the middle, which is very difficult and hard to ensure quality. Especially, welding detachment is likely to occur at the welding points. Therefore, it is difficult to promote and adopt this method.

[0005] The patent application publication number of the utility model patent is CN202394619U, and the title is "Sector Resistance Unit and Resistor Using Sector Resistance Unit". This patent proposes a sector resistance unit, which includes a supporting outer box, an insulating member, a resistance component, and a wiring tap. The inner wall of the supporting outer box is provided with the insulating member, the outer wall of the supporting outer box is provided with the wiring tap, and the resistance component is fixed on the insulating member; the resistor is composed of a plurality of sector resistance units, a connecting plate, and a fan. A plurality of sector resistance units are connected through the connecting plate to form a circular resistor body, and the fan is arranged on one side of the resistor body. However, this patent only proposes a sector resistance unit and does not consider the different heat dissipation of the resistance sheet in the radial direction.

[0006] 3. The patent application publication number is CN116364365A, and the invention patent with the title of "A Mine-used Radial Resistance Grid" includes: a plurality of resistance grid units. Each resistance grid unit includes a plurality of sector resistance units and an arc-shaped frame plate. The plurality of sector resistance units are arranged inside the arc-shaped frame plate along the length direction of the arc-shaped frame plate; the arc-shaped frame plate includes an outer frame plate, an inner frame plate, and a plurality of insulating blocks. The plurality of insulating blocks are arranged along the length direction of the inner arc side of the outer frame plate and the length direction of the outer arc side of the inner frame plate. A plurality of support columns are arranged on the surface of the insulating blocks; the sector resistance unit is formed by bending a continuous resistance band at the position of the support columns and winding the whole resistance band to form a sector structure. A positioning hole is opened at the bending part of the sector resistance unit, and the positioning hole is sleeved around the support column to achieve fixation. This patent only improves the structure of the sector resistance unit but also does not consider the problem of uneven radial heat dissipation of the resistance sheet.

[0007] Through the analysis of the above patents, it is found that although these patents all involve the resistor chips of high-power circular resistors and some improvements to the structure of sector-shaped resistor chips are proposed, upon careful analysis, it can be found that most of these patents do not consider how to solve the problem of uneven heat dissipation caused by the gaps in the radial direction of the resistor chips; only one of them considers this aspect of the problem, but the method adopted is too complex and it is difficult to effectively solve the problems described above. Summary of the Invention

[0008] The technical problem to be solved by the present invention is, aiming at the problem of uneven heat dissipation in the radial direction of the resistor chips of existing high-power circular resistors, the present invention intends to provide a strip-shaped resistor chip for circular resistors that can effectively solve the problem of uneven heat dissipation in the radial direction of the resistor chips, and the implementation method is simple and easy to manufacture and process; this strip-shaped resistor chip can improve the heat dissipation condition of the strip-shaped resistor chips in the circular resistor and achieve equivalent heat dissipation in the radial direction of the resistor chips.

[0009] The present invention is mainly realized through the following technical solutions:

[0010] A strip-shaped resistor chip for circular resistors, the strip-shaped resistor chip is a long strip-shaped thin-film resistor chip, and the strip-shaped resistor chip includes a long strip-shaped body, and there are protrusions on the long strip-shaped body that cause local deformation of the resistor chip; the protrusions are long strip-shaped protrusions arranged along the length direction of the resistor chip, and the protrusion height of the long strip-shaped protrusions on the surface of the resistor chip is a gradually changing long strip-shaped protrusion with unequal heights.

[0011] Further, the long strip-shaped protrusions are long strip-shaped protrusions formed by pressing on the surface of the resistor chip along the length direction of the resistor chip, and the long strip-shaped protrusions are continuously or intermittently extended from one end to the other end of the resistor chip along the length direction with unequal heights and gradually changing.

[0012] Further, the long strip-shaped protrusions include long strip-shaped protrusions formed by single-sided pressing on the resistor chip body or double-sided long strip-shaped protrusions formed by double-sided pressing; and the long strip-shaped protrusions are gradually changing along the length direction.

[0013] Further, the long strip-shaped protrusions formed by single-sided pressing are formed by pressing out long strip-shaped protrusions on the body of the long strip-shaped resistor chip in one direction, and the long strip-shaped protrusions are gradually changing along the length direction; among them, the height of the outermost protrusion in the radial direction of the circular resistor is the highest, and the closer to the center, the lower the height of the protrusion, so as to satisfy that the gaps between the resistor chips are equivalent heat dissipation channels.

[0014] Further, the double-sided strip-shaped protrusions formed by double-sided pressing are respectively pressed out on the body of the strip-shaped resistor in two directions, and the strip-shaped protrusions are gradually changed along the length direction; among them, the height of the outermost protrusion in the radial direction of the circular resistor is the highest, and the closer to the center, the lower the height, so as to meet the requirement that the gap between the resistor sheets is an equivalent heat dissipation channel.

[0015] Further, the cross-sectional shape of the strip-shaped protrusion includes an arc-shaped protrusion, a triangular protrusion or a rectangular protrusion.

[0016] Further, the strip-shaped resistor sheet includes a single resistor sheet or a resistor band formed by combining multiple resistor sheets.

[0017] Further, the resistor band is a single resistor band, which is bent according to the length of the single resistor sheet to form a form of combining multiple resistor sheets. Centered on the axis of the high-power circular resistor, it is radially and circumferentially evenly distributed inside the high-power circular resistor, and a fan-shaped arranged resistor unit is formed through assembly.

[0018] Further, the single resistor sheet or the resistor band inside the high-power circular resistor is arranged in a fan shape, and the gaps between the resistor sheets formed by the strip-shaped protrusions on each resistor sheet are close to equal, forming a heat dissipation channel with an equivalent heat dissipation effect.

[0019] Advantages of the present invention:

[0020] The present invention presses out strip-shaped protrusions with unequal heights and gradual changes on the resistor sheet, and adjusts the inner and outer gaps in the radial direction of the resistor sheet through the strip-shaped protrusions with unequal heights and gradual changes, which can effectively improve the heat dissipation effect of the fan-shaped resistor unit; the main advantages are as follows:

[0021] 1. By using strip-shaped protrusions to adjust the gap between the resistor sheets in the circular resistor, the gap of the resistor sheets far from the center of the circle can be controlled to be the same or similar to that near the center of the circle. Therefore, when the cooling air flows through the resistor sheets at this time, since the gaps at each place are not much different, the air resistance is quite the same, and the cooling air can flow evenly through the entire surface of the resistor sheets, enabling the heated resistor sheets to dissipate heat evenly;

[0022] 2. By forming strip-shaped protrusions on the resistor sheet itself to make the resistor sheet dissipate heat evenly, on the one hand, it can reduce the temperature rise of the entire resistor, make the internal thermal stress of the resistor sheet evenly distributed, and improve the system safety of the resistor;

[0023] 3. By improving the rib structure of the resistor sheet, it can not only effectively enhance the strength of the resistor sheet, but also improve the heat dissipation of the resistor sheet, killing two birds with one stone;

[0024] 4. By directly pressing long strip-shaped protrusions on the resistor chip, it can be directly formed by adjusting the forming die of the resistor chip, with simple production and easy to promote and adopt. Description of the Drawings

[0025] Figure 1 It is a schematic structural diagram of an existing circular resistor sector resistor chip unit;

[0026] Figure 2 It is a schematic structural diagram when forming a circular resistor by combining resistor chips;

[0027] Figure 3 It is a schematic structural diagram of a single group of resistor chips of the present invention;

[0028] Figure 4 It is a schematic structural diagram of the resistor chip of the present invention seen from the top;

[0029] Figure 5 It is a schematic side structural diagram of a single group of resistor chips of the present invention;

[0030] Figure 6 It is a schematic diagram of the gap formed by combining resistor chips of the present invention;

[0031] Figure 7 It is a schematic structural diagram of a sector resistor unit formed by the resistor chip of the present invention. Detailed Description of the Preferred Embodiments

[0032] The present invention will be described in detail below with reference to the accompanying drawings and specific embodiments. Embodiment 1

[0033] This embodiment is a resistor chip of a high-power circular resistor. The resistor chip 3 is formed by bending a strip-shaped resistor tape according to the length of a single group of resistor chips; two resistor chips 3 are in a group and are radially arranged as four sector chip-type resistor modules 2 in a fan-shaped bending form within the high-power circular resistor housing 1, and a circular resistor is formed by combining the four sector chip-type resistor modules 2; and the radially radiating sector chip-type resistor modules 2 are composed of multiple resistor chips 3 evenly arranged in a fan-shaped manner. Among them, the end 201 of the resistor chip 3 is installed on the insulator 203 through the fixing member 202, and the insulator 203 is installed on the arc-shaped guide plate 205 through the fastener 205 to form the sector chip-type resistor module 2, as shown in the attached Figure 7 figure.

[0034] There are long strip-shaped protrusions 4 protruding from the surface of the resistor chip 3; the long strip-shaped protrusions 4 are arranged along the radial length direction of the resistor chip 3 in a radially radiating manner, and the protrusion height is a long strip-shaped protrusion with unequal height and gradual change.

[0035] From the attached Figure 3It can be seen that the strip-shaped protrusions on the resistor chip 3 are two strip-shaped protrusions formed by double-sided pressing on the surface of the resistor chip 3 along the length direction of the resistor chip, namely the upper protrusion strip 401 and the lower protrusion strip 402, and the strip-shaped protrusion 4 is a strip-shaped protrusion with unequal heights that continuously or intermittently extends from one end to the other end in the length direction of the resistor chip.

[0036] The so-called strip-shaped protrusion with unequal heights means that the height of the strip-shaped protrusion 4 protruding from the basic surface of the resistor chip is different and gradually changes along the length direction; among them, the outermost 206 in the radial direction protrudes the highest, and the closer to the center 207, the lower the protruding height. When all the resistor chips 3 are assembled into a circular resistor, since the height of the ribbing away from the center of the circle is high, the gap between the resistor chips on the side away from the center of the circle is reduced, while the height of the ribbing near the center of the circle is small, and there is still a certain gap between the resistor chips. In this way, the gap H in the radial direction between the two resistor chips 3 is approximately equal inside and outside, so as to meet the requirement that the gap between the resistor chips is an equivalent heat dissipation channel.

[0037] The so-called strip-shaped protrusion 4 is a double-sided strip-shaped protrusion formed by pressing on both sides of the resistor chip 3, protruding from the basic surface 403 of the resistor chip, one is the upward protruding upper protrusion strip 401 and the other is the downward protruding lower protrusion strip 402, forming protrusions on both sides of the resistor chip 3 from the outside to the inside. The cross-sectional shape of the protrusion is an "S" shape, but it can also be a double-sided triangular protrusion or a rectangular protrusion, and these strip-shaped protrusions gradually decrease in height from the outside to the inside in the radial direction. By adjusting the gap between the resistor chips through the strip-shaped protrusions, the gap inside and outside in the radial direction of the resistor chip 3 is made equal, so that the wind resistance inside and outside in the radial direction when the cooling air passes through the resistor chip is also equal.

[0038] It should be further explained that the resistor chip 3 is formed by bending a whole resistor strip. The whole resistor strip is respectively pressed with strip-shaped protrusions 4 according to the length of the resistor chip; at this time, attention should be paid to the gradual change direction of the protruding height of the strip-shaped protrusion 4, so that when the resistor strip is bent to form resistor chips arranged in a fan shape, it is ensured that the strip-shaped protrusions 4 on each resistor chip gradually decrease in height from the outside to the inside in the radial direction.

[0039] In addition, two reinforcing ribs 5 are pressed on both sides of each resistor chip 3, which is more conducive to improving the strength of the resistor chip.

[0040] This method of forming resistor chips by bending a whole resistor strip is convenient to manufacture. Only the pressing mold needs to be changed, and attention should be paid to the gradual change direction of the protruding height of the pressed strip-shaped protrusions. Embodiment 2

[0041] The basic principle of the second embodiment is the same as that of the first embodiment, except that the forming method of the resistor sheet 3 is somewhat different from that of the first embodiment; the resistor sheet is formed by bending and combining an integral resistor strip, and long strip protrusions are pressed on the bent resistor sheet; the long strip protrusions still adopt double-sided pressing to form long strip protrusions with an "S"-shaped cross-section; and the height of the long strip protrusions is gradually changed, and the gradual change direction is along the radial direction of the resistor sheet, gradually decreasing from the outside to the inside, so as to ensure that the wind resistance of the formed heat dissipation channels in the radial direction is the same, forming equivalent heat dissipation. Embodiment 3

[0042] The basic principle of the third embodiment is the same as that of the first embodiment, except that the forming method of the resistor sheet 3 is somewhat different from that of the first embodiment; the resistor sheet 3 adopts a single-piece resistor sheet, and a fan-shaped resistor unit 2 is formed by combining single-piece resistor sheets. The long strip protrusions on each resistor sheet are the same as those in the first embodiment, adopting long strip protrusions with an "S"-shaped cross-section; and the height of the long strip protrusions is gradually changed, and the gradual change direction is along the radial direction of the resistor sheet, gradually decreasing from the outside to the inside, so as to ensure that the wind resistance of the formed heat dissipation channels in the radial direction is the same, forming equivalent heat dissipation. Embodiment 4

[0043] The basic principle of the fourth embodiment is the same as that of the first embodiment, except that the forming method of the long strip protrusions on the resistor sheet 3 is somewhat different from that of the first embodiment; the long strip protrusions are formed by single-sided pressing, that is, on the body of the resistor sheet, one or more long strip protrusions are unidirectionally pressed in one direction, and the height of each long strip protrusion is gradually changed, and the gradual change direction is along the radial direction of the resistor sheet, gradually decreasing from the outside to the inside; the cross-sectional shape of the long strip protrusions of the resistor sheet includes single-sided arc wave protrusions; or single-sided triangular wave protrusions; or single-sided rectangular wave protrusions; and the height of the long strip protrusions is gradually changed, and the gradual change direction is along the radial direction of the resistor sheet, gradually decreasing from the outside to the inside, so as to ensure that the wind resistance of the formed heat dissipation channels in the radial direction is the same, forming equivalent heat dissipation.

[0044] In summary, the beneficial effects of this embodiment are as follows: A new type of resistor sheet is provided, and the height of the punched reinforcing ribs thereof changes continuously along the length direction of the resistor sheet. In particular, when this resistor sheet is used in a circular resistor, the height of the punched ribs of the resistor sheet near the center of the circle can be reduced, while the height of the punched ribs of the resistor sheet far from the center of the circle can be increased, so that the height of the punched ribs of the resistor sheet changes continuously along its length direction. When all the resistor sheets are assembled into the circular resistor, since the height of the punched ribs far from the center of the circle is high, the gap between the resistor sheets on the side far from the center of the circle is reduced, while the height of the punched ribs on the side near the center of the circle is small, and there is still a certain gap between the resistor sheets.

[0045] By adjusting the forming die of the resistor chip, the voids of the resistor chip on the side far from the center can be controlled to be the same as or similar to those on the side close to the center. Therefore, when the cooling air flows through the resistor chip at this time, since the voids at each place are not much different, their air resistances are equivalent, and the cooling air can flow evenly through the entire surface of the resistor chip, enabling the heated resistor chip to dissipate heat evenly. The uniform heat dissipation of the resistor chip can, on the one hand, reduce the temperature rise of the entire resistor, make the internal thermal stress of the resistor evenly distributed, and improve the system safety of the resistor. On the other hand, the elimination of local high-temperature points can extend the service life of the resistor chip and reduce the maintenance cost of the resistor.

[0046] It should be noted that the above-listed embodiments are only a clear and complete description of the technical solutions of the present invention in conjunction with the accompanying drawings; obviously, the described embodiments are only a part of the embodiments of the present invention, rather than all the embodiments. Moreover, the terms such as "upper", "lower", "front", "rear", "middle" and the like cited in this specification are only for the convenience of clear narration, rather than for limiting the scope of implementation of the present invention. The change or adjustment of their relative relationships, without substantial change in the technical content, should also be regarded as the scope of implementation of the present invention. At the same time, the structures, ratios, sizes, etc. shown in the drawings of the specification are only used to cooperate with the content disclosed in the specification for those who are familiar with this technology to understand and read, rather than for limiting the limiting conditions for the implementation of the present invention. Therefore, they do not have substantial technical significance. Any modification of the structure, change of the proportional relationship or adjustment of the size, without affecting the functions that the present invention can produce and the purposes that can be achieved, should still fall within the scope covered by the technical content disclosed in the present invention. Based on the embodiments in the present invention, all other embodiments obtained by those of ordinary skill in the art without creative efforts shall fall within the scope of protection of the present invention.

[0047] The beneficial effects of the present invention:

[0048] The present invention presses out strip-shaped protrusions with unequal heights and gradual changes on the resistor chip. By adjusting the inner and outer gaps in the radial direction of the resistor chip through the strip-shaped protrusions with unequal heights and gradual changes, the heat dissipation effect of the sector-shaped resistor unit can be effectively improved; the main advantages are as follows:

[0049] 1. By using the strip-shaped protrusions to adjust the gaps between the resistor chips, the voids of the resistor chip on the side far from the center can be controlled to be the same as or similar to those on the side close to the center. Therefore, when the cooling air flows through the resistor chip at this time, since the voids at each place are not much different, their air resistances are equivalent, and the cooling air can flow evenly through the entire surface of the resistor chip, enabling the heated resistor chip to dissipate heat evenly;

[0050] 2. By forming strip-shaped protrusions on the resistor chip itself to achieve uniform heat dissipation of the resistor chip, on the one hand, it can reduce the temperature rise of the entire resistor, make the internal thermal stress of the resistor chip evenly distributed, and improve the system safety of the resistor;

[0051] 3. By improving the rib structure of the resistor chip, it can not only effectively enhance the strength of the resistor chip, but also improve the heat dissipation of the resistor chip, killing two birds with one stone;

[0052] 4. By directly pressing strip-shaped protrusions on the resistor chip, it can be directly molded by adjusting the molding die of the resistor chip. The production is simple, the production cost is low, and it is convenient to promote and adopt.

Claims

1. A strip resistor used in a circular resistor, the strip resistor being a long thin strip resistor, the strip resistor comprising a long strip body, and a protrusion on the long strip body causing partial deformation of the resistor; characterized in that: The protrusions are long strip protrusions arranged along the length direction of the resistor sheet, and the protrusion heights of the long strip protrusions on the surface of the resistor sheet are unequally high and gradually varying long strip protrusions.

2. The strip resistor used in a circular resistor as claimed in claim 1, characterized in that: The long strip protrusion is formed by pressing on the surface of the resistor along the length direction of the resistor, and the long strip protrusion extends continuously or discontinuously from one end of the resistor in the length direction to the other end of the resistor to form a long strip protrusion of unequal height and gradient.

3. The strip resistor used in a circular resistor as claimed in claim 2, characterized in that: The long strip protrusions include long strip protrusions formed by pressing on one side of the resistor body, or double-sided long strip protrusions formed by pressing on both sides; and the long strip protrusions are gradually changed along the length direction.

4. The strip resistor used in a circular resistor as claimed in claim 3, characterized in that: The long strip protrusion formed by single-sided pressing is pressed out in one direction on the body of the long strip resistor sheet, and the long strip protrusion is gradually changed along the length direction; wherein, the outermost protrusion in the radial direction of the circular resistor has the highest height, and the protrusion closer to the center has a lower height, so as to ensure that the gap between the resistor sheets is an equivalent heat dissipation channel.

5. The strip resistor used in a circular resistor as claimed in claim 3, characterized in that: The double-sided long strip protrusions formed by the double-sided pressing press out long strip protrusions in two directions on the body of the long strip resistor sheet, and the long strip protrusions are gradually changed along the length direction; wherein, the outermost protrusion in the radial direction of the circular resistor has the highest height, and the protrusion height is lower towards the center, so as to ensure that the gap between the resistor sheets is an equivalent heat dissipation channel.

6. The strip resistor used in a circular resistor as claimed in claim 2, characterized in that: The cross-sectional shape of the elongated protrusions includes arc-shaped protrusions, triangular protrusions or rectangular protrusions.

7. The strip resistor used in a circular resistor as claimed in claim 1, characterized in that: The strip resistor sheet includes a single resistor sheet or a resistor strip formed by combining multiple resistor sheets.

8. The strip resistor used in a circular resistor as claimed in claim 7, characterized in that: The resistor strip is a resistor strip, which is bent according to the length of a single resistor sheet to form a combination of multiple resistor sheets. With the axis center of the high-power circular resistor, radial circles are evenly distributed in the body of the high-power circular resistor, and a fan-shaped resistor unit is formed through assembly.

9. The strip resistor used in a circular resistor as claimed in claim 7, characterized in that: The single-piece resistor sheets or resistor strips in the high-power circular resistor are all arranged in a fan shape, and the gaps between the resistor sheets are nearly equal through the long strip protrusions on each resistor sheet, forming a heat dissipation channel with an equivalent heat dissipation effect.

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