Load resistor

Abstract

The utility model discloses a load resistor. The load resistor comprises a load assembly. The load assembly is arranged in the heat dissipation channel, the load assembly comprises a framework and a resistance tape, the framework is arranged in the heat dissipation channel, the resistance tape is wound on the framework, and at least part of the cross section of the resistance tape is provided with a bent part or a bent part. In the load assembly, the resistor belt is arranged, the contact area of the resistor and air is increased, the heat dissipation area is increased, and the heat dissipation effect is improved. The cross section of the resistance tape is bent or bent, so that the strength of the resistance tape is improved, when the resistance tape expands with heat and contracts with cold, the deformation of the resistance tape is avoided or reduced, the distortion and short circuit of the resistance tape are avoided or reduced, and the stable performance of the load resistor is kept.

Description

TECHNICAL FIELD

[0001] The utility model relates to a kind of resistance device technical field, especially a kind of load resistance. BACKGROUND

[0002] Resistance is the electronic device commonly used in electrical field, according to design needs, not only can reduce voltage and limit current in circuit, but also can play the role of brake or discharge electricity and other consumption electric energy.

[0003] The resistance is high-power load resistance, which plays an important role in circuit or device. The primary function of high-power load resistance is to consume excess power. For example, to avoid the excess current from flowing to other components or devices, the load resistance can be used to consume power at this time. The specific application is motor brake. High-power load resistance is also commonly used for power supply detection and hardware detection. For example, by connecting a power supply device with high-power load resistance, the load resistance can be used to test parameters and perform aging detection. During hardware function detection, the load resistance is often used as a simulation product to detect hardware function. In addition, high-power load resistance also has the functions of buffer brake and device protection.

[0004] Traditional load resistance is wound with resistance wire or resistance tape on a certain insulating framework, and an additional encapsulation layer is provided. However, it has the disadvantages of large volume, heavy weight, and slow heat dissipation. In addition, in some load resistances with dense resistance arrangement, the strip-shaped resistance may be deformed due to long-term work, which may cause short-circuit risk. SUMMARY

[0005] To solve the technical problem of load resistance deformation caused by long-term work in the prior art, one of the purposes of the utility model is to provide a load resistance. The utility model adopts special processing and installation method for resistance tape to effectively prevent deformation and short circuit.

[0006] One of the purposes of the utility model is achieved by the following technical scheme:

[0007] A load resistance, characterized in that the load resistance comprises a load assembly.

[0008] The load assembly is arranged in a heat dissipation channel. The load assembly comprises a framework and a resistance tape. The framework is arranged in the heat dissipation channel. The resistance tape is wound on the framework. The cross section of the resistance tape at least partially has a curved portion or a bent portion.

[0009] Preferably, the framework comprises two root bone strips. The two bone strips are arranged at intervals. The bone strips are provided with a plurality of through holes distributed along the length direction.

[0010] The resistance band is arranged on the two bone strips through the through holes, and the resistance band is arranged in turn.

[0011] Preferably, the framework comprises a plurality of bone strips arranged in parallel at intervals, and the bone strips are provided with a plurality of through holes distributed along the length direction thereof.

[0012] The resistance band is arranged on the plurality of bone strips through the through holes, and the resistance band is arranged in turn.

[0013] Preferably, the through holes are flat long holes.

[0014] Preferably, the through holes penetrate to one side in the width direction of the bone strips.

[0015] Preferably, the load resistance further comprises a plurality of mounting strips, the mounting strips are arranged in pairs, the number of pairs of mounting strips corresponds to the number of bone strips in the load assembly, and the two mounting strips in each pair are arranged on the two sides of the load assembly, respectively.

[0016] Preferably, the number of the load assemblies is multiple, and the plurality of load assemblies are arranged in parallel, and the end portions of the bone strips are arranged on the mounting strips.

[0017] Preferably, the mounting strips are provided with mounting grooves extending along the length direction thereof.

[0018] The end portions of the bone strips are arranged in the mounting grooves of the corresponding mounting strips in a sliding manner.

[0019] Preferably, the mounting strips comprise upper clamping strips, lower clamping strips and limiting members, the mounting grooves are arranged between the upper clamping strips and the lower clamping strips, the first end of the upper clamping strip and the first end of the lower clamping strip are fixedly connected, and the limiting members are detachably connected to the second end of the upper clamping strip and the second end of the lower clamping strip to close the channel for loading or sliding out the bone strips from the mounting grooves.

[0020] Preferably, the side of the mounting strips away from the load assembly is provided with a connecting structure for fixing the mounting strips.

[0021] Preferably, the limiting members are fastening screws.

[0022] Compared with the prior art, the utility model has the beneficial effects that:

[0023] In the load assembly of the utility model, the resistance band is arranged, the area of the resistance in contact with air is increased, the heat dissipation area is increased, and the heat dissipation effect is increased. The cross section of the resistance band is curved or bent, the strength of the resistance band is increased, when the resistance band expands or shrinks due to heat, deformation of the resistance band is avoided or reduced, the resistance band is avoided or reduced from being twisted and short-circuited, and the performance stability of the load resistance is maintained. BRIEF DESCRIPTION OF DRAWINGS

[0024] Figure 1 It is a structure schematic view of the load resistance box of the utility model;

[0025] Figure 2 It is a structure schematic view of another view of the load resistance box of the utility model;

[0026] Figure 3 It is an exploded schematic view of the load resistance box of the utility model;

[0027] Figure 4 It is a cross section schematic view of the resistance band in the load resistance of the utility model;

[0028] Figure 5 It is a structure schematic view of the load resistance of the utility model;

[0029] Figure 6 It is a structure schematic view of the load assembly in the load resistance of the utility model;

[0030] Figure 7 It is an exploded schematic view of the load assembly in the load resistance of the utility model;

[0031] Figure 8 It is a structure schematic view of the mounting strip in the load resistance of the utility model;

[0032] Figure 9 It is Figure 8 The enlarged view of the local area A in the middle;

[0033] Figure 10 It is the assembly schematic view of the mounting strip and the box body in the load resistance of the utility model;

[0034] Figure 11 It is the overhead schematic view of the load resistance box of the utility model.

[0035] The figure mark is explained:

[0036] 1, the box body; 11, the heat dissipation passage; 12, the fixed hole;

[0037] 2, the ventilation assembly; 21, the fan plate; 22, the fan;

[0038] 3, the load assembly; 31, the bone strip; 311, the through hole; 32, the resistance band;

[0039] 4, the mounting strip; 41, the upper clamping strip; 42, the lower clamping strip; 43, the limiting piece; 44, the mounting groove; 45, the connecting structure; 451, the connecting part; 452, the barb part; 453, the inner side; 46, the connecting plate;

[0040] 5, the wiring board; 51, the wiring terminal; 52, the bridging block. Detailed Implementation

[0041] The following will refer to the appendices in the embodiments of this application. Figure 1 To be continued Figure 11 The technical solutions in the embodiments of this application are clearly and completely described. Obviously, the described embodiments are only a part of the embodiments of this application, and not all of the embodiments. Based on the embodiments in this application, all other embodiments obtained by those of ordinary skill in the art without creative effort are within the scope of protection of this application.

[0042] It should be noted that all directional indicators (such as up, down, left, right, front, back, etc.) in the embodiments of this application are only used to explain the relative positional relationship and movement of each component in a certain specific posture (as shown in the figure). If the specific posture changes, the directional indicator will also change accordingly.

[0043] Furthermore, the use of terms such as "first" and "second" in this application is for descriptive purposes only and should not be construed as indicating or implying their relative importance or implicitly specifying the number of technical features indicated. Therefore, a feature defined as "first" or "second" may explicitly or implicitly include at least one of that feature. Additionally, the technical solutions of the various embodiments can be combined with each other, but only on the basis of being achievable by those skilled in the art. When the combination of technical solutions is contradictory or impossible to implement, such a combination of technical solutions should be considered non-existent and not within the scope of protection claimed in this application.

[0044] like Figures 1-4 The diagram illustrates a load resistor box, comprising a box body 1, a ventilation assembly 2, and a load resistor, which includes a load component 3. The box body 1 serves as the basic mounting structure for the load resistor and contains a heat dissipation channel 11, which also serves as the mounting area for the load component 3. The ventilation assembly 2 is located at the inlet or outlet of the heat dissipation channel 11, increasing the airflow and thus enhancing the heat dissipation effect of the load component 3. The load component 3 is housed within the heat dissipation channel 11 and includes a frame and a resistor strip 32. The frame is positioned within the heat dissipation channel 11, and the resistor strip 32 is wound around the frame. The cross-section of the resistor strip 32 has at least a partially curved or bent portion. For example, as... Figure 4 As shown, the resistor strip 32 has a curved portion in the middle, at one end, or at both ends of its cross-section, and the curved portion extends along the length of the resistor strip 32. Alternatively, the resistor strip 32 may have a bent portion in the middle, at one end, or at both ends of its cross-section, and the bent portion extends along the length of the resistor strip 32. Furthermore, the resistor strip 32 may have a curved or bent cross-section overall.

[0045] In this embodiment, the load assembly 3 is arranged in the heat dissipation channel 11, and the ventilation assembly 2 is used to increase the ventilation of the heat dissipation channel 11, thereby increasing the heat dissipation effect. In addition, in the load assembly 3, the resistance band 32 is arranged to increase the area of the resistance in contact with the air, increase the heat dissipation area, and increase the heat dissipation effect. The cross section of the resistance band 32 is curved or bent, which increases the strength of the resistance band 32, avoids or reduces the deformation of the resistance band 32 when the resistance band 32 expands or contracts due to heat, avoids or reduces the short circuit of the resistance band 32, and keeps the performance of the load resistance stable.

[0046] In addition, the utility model discloses a long strip resistance without substrate and outer package, which realizes small volume, light weight and fast heat dissipation under the premise of same power. In consideration of the risk that the strip resistance may deform due to long-time work, the utility model adopts special processing and installation mode to effectively prevent deformation and short circuit of the resistance band.

[0047] For the resistance band 32, the cross section of the middle, one end or both ends is provided with a bending part. In actual processing, the bending structure can be processed in the corresponding position by pressing, and the specific shape is shown in (a), (b) and (c) in FIG. 4, which has a local bending structure on the flat cross section. Figure 4 For the resistance band 32, the cross section of the middle, one end or both ends is provided with a bending part. In actual processing, the bending structure can be processed in the corresponding position by pressing, and the specific shape is shown in (a), (b) and (c) in FIG. 4, which has a local bending structure on the flat cross section. Figure 4 For the resistance band 32, the cross section of the middle, one end or both ends is provided with a bending part. In actual processing, the bending structure can be processed in the corresponding position by pressing, and the specific shape is shown in (a), (b) and (c) in FIG. 4, which has a local bending structure on the flat cross section. Figure 4 For the resistance band 32, the cross section of the middle, one end or both ends is provided with a bending part. In actual processing, the bending structure can be processed in the corresponding position by pressing, and the specific shape is shown in (a), (b) and (c) in FIG. 4, which has a local bending structure on the flat cross section.

[0048] When the resistance band 32 deforms, the parts that are more prone to deformation are the two ends of the cross section away from the middle. In some preferred reinforcing methods, the two ends of the cross section of the resistance band 32 are provided with bending parts or bending parts, which can increase the strength of the resistance band 32, further increase the reinforcing effect, and avoid or reduce the short circuit of the resistance band 32.

[0049] Specifically, the box body 1 is a sheet metal hexahedron, which can be a cuboid or a cube. The front and back of the box body 1 are through, and the ventilation assembly 2 is arranged on the back of the box body 1.

[0050] In some embodiments of the winding of the resistance band 32, the resistance band 32 is wound on the skeleton, and the resistance band 32 is inserted in each row in a meandering manner. The resistance band 32 is inserted and meanders for multiple times, and is densely arranged in the heat dissipation channel 11. At the same time, the resistance band 32 also forms two sections of heat dissipation sections and meandering sections. The meandering section is located at the end of the heat dissipation section, and the meandering section is in direct contact with the skeleton.

[0051] The number of load assemblies 3 can be one or multiple, such as Figure 5 As shown, when the number of load assemblies 3 is multiple, the multiple load assemblies 3 are arranged side by side in the length direction of the heat dissipation channel 11 in the heat dissipation channel 11. The multiple load assemblies 3 can be in parallel or in series. In this way, more or longer resistors can be arranged in a limited space, the resistance value is increased, and the working power is improved.

[0052] In some embodiments of the skeleton, the skeleton can be a frame structure matched with the shape of the heat dissipation channel 11. For example, when the cross section of the heat dissipation channel 11 is rectangular, the skeleton is a rectangular frame.

[0053] In some embodiments of the skeleton, the skeleton includes two root skeleton strips 31, which are arranged on both sides of the heat dissipation channel 11. The skeleton strip 31 is provided with multiple through holes 311 distributed along the length direction thereof. The resistance band 32 is arranged on the two skeleton strips 31 through the through holes 311, and the resistance band 32 is inserted in each row in a meandering manner. Specifically, the two skeleton strips 31 are arranged at the top and bottom of the heat dissipation channel 11, respectively. The resistance band 32 is wound on the upper and lower skeleton strips 31 through the through holes 311, and is inserted in each row in a meandering manner along the left and right directions, so that the resistance band 32 is densely wound on the two skeleton strips 31 in an arc shape. In this way, longer resistors can be arranged in a limited space, the resistance value is increased, and the working power is improved.

[0054] In some embodiments of the skeleton, as shown in Figure 6 , Figure 7 The skeleton includes a plurality of skeleton strips 31, which are arranged side by side in the heat dissipation channel 11. The skeleton strip 31 is provided with multiple through holes 311 distributed along the length direction thereof. The resistance band 32 is arranged on the plurality of skeleton strips 31 through the through holes 311, and the resistance band 32 is inserted in each row in a meandering manner.

[0055] The plurality of bone strips 31 are arranged in parallel and spaced apart in the heat dissipation channel. Specifically, the plurality of bone strips 31 include upper bone strips, lower bone strips, and intermediate bone strips. Two of the plurality of bone strips 31 are arranged at the top and bottom of the heat dissipation channel 11, i.e., the upper bone strips and the lower bone strips are arranged at the top and bottom of the heat dissipation channel 11, respectively. The intermediate bone strips are located between the upper bone strips and the lower bone strips. In this way, in one load assembly 3, in addition to the upper bone strips or the lower bone strips being fixed at the detour position, the intermediate bone strips are also fixed at the heat dissipation section, thereby increasing the support and fixation effect on the resistance band. Specifically, the intermediate bone strips maintain the heat dissipation end of the fixed resistance band, thereby reducing the deformation and twisting caused by high-speed airflow. The intermediate bone strips limit the deformation amplitude of the heat dissipation section when it is heated, thereby reducing the deformation and twisting of the resistance band 32 and avoiding short-circuiting of the resistance band 32. The resistance band 32 is wound around the upper and lower bone strips 31 through the through holes 311 and is arranged in a meandering manner in the left-right direction, so that the resistance band 32 is arranged in an arcuate and dense manner on the two bone strips 31. In this way, longer resistance can be arranged in a limited space, the resistance value is increased, and the working power is improved.

[0056] Further, the through holes 311 are flat long holes. When the resistance band 32 passes through the through holes 311, the cross-sectional shape of the resistance band 32 has better adaptability with the through holes 311, which can better limit the deformation and twisting of the resistance band 32.

[0057] Of course, in order to further improve the limiting effect, the through holes 311 are long holes with a shape that matches the cross-sectional shape of the resistance band 32.

[0058] When the bone strips 31 are used as the framework, the load assembly 3 needs to be assembled with the help of some auxiliary fixing structures to support and fix the position of the framework, and then the resistance band 32 is wound around. Then the load assembly 3 is assembled together with the auxiliary fixing structure into the heat dissipation channel 11, and finally the auxiliary fixing structure is disassembled. There is a problem of complex assembly of the load assembly 3. In some improved embodiments of the bone strips 31, the through holes 311 penetrate to one side of the bone strips 31 in the width direction. In this way, during assembly, the bone strips 31 can be first assembled into the heat dissipation channel 11, and then the resistance band 32 can be wound around each bone strip 31 from the penetration side of the through holes 311. In this way, the assembly is convenient.

[0059] In some embodiments of the load resistor, as shown in Figure 5 The load resistor also includes a plurality of mounting strips 4 arranged on the inner walls of the two sides of the heat dissipation channel 11. The mounting strips 4 extend in the length direction of the heat dissipation channel 11, in other words, the length direction of the mounting strips 4 is parallel or in the same direction as the length direction of the heat dissipation channel 11.

[0060] For the installation strip 4 is arranged on the inner wall of both sides of the heat dissipation channel 11, specifically, the installation strip 4 is arranged in pairs, the number of pairs of installation strips 4 corresponds to the number of bone strips 31 in the load assembly 3, and the two installation strips 4 arranged in pairs are arranged on the left and right inner walls of the heat dissipation channel 11, specifically, the left and right inner walls of the heat dissipation channel 11, and the two installation strips 4 arranged in pairs are also arranged on the left and right sides of the load assembly 3. For the number of pairs of installation strips 4 corresponds to the number of bone strips 31 in the load assembly 3, for example, the skeleton includes two bone strips 31, and a plurality of installation strips 4 are arranged in two pairs, and the skeleton includes five bone strips 31, and a plurality of installation strips 4 are arranged in five pairs.

[0061] The number of load assemblies 3 is multiple, and the multiple load assemblies 3 are arranged in the heat dissipation channel 11 in the length direction of the heat dissipation channel 11, and the end of the bone strip 31 is arranged on the installation strip 4, or in other words, the two ends of the bone strip 31 are arranged on the corresponding pair of installation strips 4.

[0062] In this embodiment, after the installation strip 4 is arranged, the inner walls on both sides of the heat dissipation channel 11 have a structure capable of assembling or assisting in assembling the bone strip 31, and more load assemblies 3 are assembled within the length range of the installation strip 4, effectively providing the convenience of assembling the skeleton or bone strip 31.

[0063] For the installation strip 4, specifically, as shown in Figure 8 , the installation strip 4 is provided with a mounting groove 44 extending in the length direction thereof. The end of the bone strip 31 is slidably arranged in the mounting groove 44 of the corresponding installation strip 4, so that the bone can slide into the heat dissipation channel 11 along the mounting groove 44, and be assembled and disassembled by sliding, further improving the convenience of disassembly.

[0064] In some further embodiments of the installation strip 4, as shown in Figure 8 , Figure 9 The installation strip 4 includes an upper clamping strip 41, a lower clamping strip 42 and a limiting piece 43. The upper clamping strip 41 and the lower clamping strip 42 have a gap therebetween, which is the mounting groove 44. The first end of the upper clamping strip 41 and the first end of the lower clamping strip 42 are fixedly connected, and the limiting piece 43 is detachably connected to the second end of the upper clamping strip 41 and the second end of the lower clamping strip 42, closing the passage of the bone strip 31 into or out of the mounting groove 44.

[0065] Specifically, the limiting piece 43 can be a fastening screw, and the second end of the upper clamping strip 41 and the second end of the lower clamping strip 42 close the passage of the bone strip 31 sliding in and out by the fastening screw, limiting the position of the bone strip 31. When the bone strip 31 is assembled into the mounting groove 44, the end of the bone strip 31 extends into the mounting groove 44, i.e. the end of the bone strip 31 is arranged between the upper clamping strip 41 and the lower clamping strip 42, and when the second end of the upper clamping strip 41 and the second end of the lower clamping strip 42 are connected by the fastening screw, the second end of the upper clamping strip 41 and the second end of the lower clamping strip 42 can be prevented from being excessively pushed by the fastening screw.

[0066] The limiting member 43 can also be a pin, such as a split pin, and the second end of the upper clamping strip 41 and the second end of the lower clamping strip 42 are each provided with a pin hole. The split pin is inserted through the two pin holes in turn, and then the split pin is bent at the split position, thereby preventing the split pin from falling off and limiting the position of the bone strip 31.

[0067] The mounting strip 4 is arranged on the inner wall of the heat dissipation channel 11, and the upper clamping strip 41 and the lower clamping strip 42 are fixed, for example, by screws.

[0068] In some other embodiments of the mounting strip 4, as shown in Figure 9 、 Figure 10 The mounting strip 4 is arranged on the inner wall of the heat dissipation channel 11, and the upper clamping strip 41 and the lower clamping strip 42 are fixed, for example, by screws.

[0069] Of course, when the connecting structure 45 is metal, the connecting portion 451 protrudes from the mounting strip 4 in the first direction, and the barb portion 452 extends along the side direction of the connecting portion 451, or in other words, the barb portion 452 extends in a direction perpendicular to the first direction. Specifically, the barb portion 452 is in the shape of a long strip, and the connecting portion 451 is perpendicular to the barb portion 452. The shape of the fixing hole 12 is matched with the shape of the connecting structure 45, including the shape of the barb portion 452. When the connecting portion 451 is inserted into the fixing hole 12, the barb portion 452 protrudes from the outer surface of the cabinet 1, at this time, the barb portion 452 is bent by means of a tool, and the ductility of the metal is used to make the barb portion 452 partially deviate from the fixing block hole, so that the barb portion 452 truly becomes a barb structure, thereby fixing the mounting strip 4.

[0070] Further, as shown in Figure 9 、 Figure 10As shown, the inner side 453 of the barb part 452 is the side close to the surface of the box body 1, or in other words, the inner side 453 of the barb part 452 faces the inside of the box body 1, the inner side 453 of the barb part 452 is inclinedly arranged, the angle between the inner side 453 and the surface of the box body 1 is a, and the inner side 453 of the barb part 452 gradually moves away from the surface of the box body 1 as it approaches the end of the barb part 452. The length of the connecting part 451 is less than the thickness of the box body 1, and the barb part 452 at least the end protrudes out of the fixing hole 12 and the surface of the box body 1. In this way, the barb part 452 is partially located in the fixing hole 12, and when the barb part 452 is bent, due to the inclined arrangement of the inner side 453 of the barb part 452, the size of the barb part 452 gradually changes, and as the bending amount of the barb part 452 increases, the pressing force between the barb part 452 and the surface of the box body 1 increases, and the installation of the installation strip 4 is more firm. When the installation strip 4 is subsequently animated, the barb part 452 can be bent again with a tool to increase the bending amount, and the installation strip 4 can be fixed again.

[0071] For the aforementioned a, the angle range is greater than zero and less than twenty degrees.

[0072] The surface of the installation strip 4 close to the box body 1 is a fixing surface, when the installation groove 44 is arranged on the installation strip 4, the connecting structure 45 is arranged on the fixing surface corresponding to both sides of the installation groove 44, or in other words, the upper and lower parts of the fixing surface are provided with the connecting structure 45, and in this way, two rows of connecting structures 45 are formed on the fixing surface, which effectively enhances the assembly stability of the installation strip 4, and further provides the assembly stability of the load assembly 3.

[0073] For the specific processing method of the connecting structure 45, as shown, Figure 9 The connecting structure 45 can be cut out on the fixing surface of the installation strip 4 by punching, and then the connecting structure 45 is punched to protrude from the fixing surface.

[0074] When the connecting structure 45 is plastic, the barb part 452 has elasticity, and when the installation strip 4 is assembled, the barb part 452 can be clamped into the fixing hole 12 by the elasticity of the barb part 452, thereby fixing the installation strip 4.

[0075] The first end of the upper clamping strip 41 and the first end of the lower clamping strip 42 are fixedly connected, specifically, the installation strip 4 further comprises a connecting plate 46, and the two ends of the connecting plate 46 are respectively connected to the first end of the upper clamping strip 41 and the first end of the lower clamping strip 42.

[0076] In some embodiments of the load resistance box, as shown, Figure 2 , Figure 11As shown, the load resistance box further comprises a terminal block 5, the terminal block 5 is provided with a plurality of terminal posts 51 and a plurality of bridge blocks 52, the terminal posts 51 are connected with the load assemblies 3. By arranging the terminal posts 51 and connecting the terminal posts 51 through the bridge blocks 52, the different load assemblies 3 are connected in series or in parallel, the connection convenience of the load assemblies 3 is improved, and at the same time, different power resistance bands 32 combinations can be connected, the power configuration is diversified, and the load resistance box is adapted to different power working conditions.

[0077] The terminal post 51 comprises three terminal groups, which are a first terminal group, a second terminal group and a third terminal group. The two ends of the resistance band 32 in the load assembly 3 extend out of the box body 1 through the terminal block 5. Specifically, the first end of each resistance band 32 extends out from the left side of the top of the box body 1, and the second end of each resistance band 32 extends out from the right side of the top of the box body 1. The number of the load assemblies 3 is n, the first terminal group comprises x first terminal posts 51, each first terminal post 51 is arranged on the left side of the terminal block 5 in a straight line, and each first terminal post 51 is connected with the first end of the resistance band 32 in the even-numbered load assembly 3. The second terminal group comprises y second terminal posts 51, each second terminal post 51 is arranged on the left side of the terminal block 5 in a straight line, and each second terminal post 51 is connected with the first end of the resistance band 32 in the odd-numbered load assembly 3. The third terminal group comprises y third terminal posts 51, each third terminal post 51 is arranged on the right side of the terminal block 5 in a straight line, and each third terminal post 51 is connected with the second end of the resistance band 32 in two load assemblies 3. For x, y and z, specifically, x+y=n, and 2z=n.

[0078] In the embodiment, by arranging the bridge blocks 52 between different terminal posts 51, each load assembly 3 can be connected into a circuit structure in series, in parallel or in combination. Of course, by adjusting, the resistance can also be adjusted to be in series.

[0079] In some embodiments of the ventilation assembly 2, as shown in Figure 2 , Figure 3 As shown, the ventilation assembly 2 comprises a fan plate 21 and a plurality of fans 22, the fan plate 21 is arranged at one end of the heat dissipation channel 11, the fan plate 21 is provided with a plurality of ventilation holes, the ventilation holes are arranged one by one corresponding to the fans 22, and the fans 22 are arranged at the corresponding ventilation holes. By arranging the fan plate 21, the heat dissipation channel 11 can be closed, and the air flow in the heat dissipation channel 11 can be guided, and the ventilation efficiency of the heat dissipation channel 11 is improved. A plurality of fans 22 can be arranged on the fan plate 21, the ventilation amount of the heat dissipation channel 11 is increased, and the heat dissipation effect of the load assembly 3 is improved.

[0080] The above-mentioned embodiments are only preferred embodiments of the present application, and cannot be used to limit the scope of protection of the present application. Any non-essential changes and replacements made by those skilled in the art on the basis of the present application shall fall within the scope of protection of the present application.

Claims

1. A load resistance, characterized in that The load resistor comprises a load assembly; The load assembly is arranged in the heat dissipation channel, and comprises a framework and a resistor band, the framework is arranged in the heat dissipation channel, and the resistor band is arranged on the framework, and the resistor band has at least a part of a cross section with a bending part or a folding part.

2. The load resistance of claim 1, wherein, The framework comprises two root bars, the two bars are arranged in a spaced manner, and the bars are provided with a plurality of through holes distributed along the length direction of the bars; The resistor band is arranged on the two bars through the through holes, and the resistor band is arranged in a row and in a winding manner.

3. The load resistance of claim 1, wherein, The framework comprises a plurality of bars, the bars are arranged in a spaced and side-by-side manner, and the bars are provided with a plurality of through holes distributed along the length direction of the bars; The resistor band is arranged on the bars through the through holes, and the resistor band is arranged in a row and in a winding manner.

4. A load resistance as claimed in claim 2 or 3, characterized in that The through hole is a flat long hole.

5. The load resistance of claim 4, wherein, The through hole penetrates to one side of the bar in the width direction.

6. A load resistance as claimed in any one of claims 2 or 3, characterized in that, The load resistor further comprises a plurality of mounting bars, the mounting bars are arranged in pairs, the number of the pairs of mounting bars corresponds to the number of the bars in the load assembly, and the two mounting bars in each pair are arranged on the two sides of the load assembly, respectively. The number of the load assemblies is multiple, and the load assemblies are arranged in a side-by-side manner, and the end portions of the bars are arranged on the mounting bars.

7. The load resistance of claim 6, wherein, The mounting bar is provided with a mounting groove extending along the length direction of the mounting bar; The end portion of the bar is arranged in the mounting groove of the corresponding mounting bar in a sliding manner.

8. The load resistance of claim 6, wherein, The mounting bar comprises an upper clamping bar, a lower clamping bar and a limiting member, the mounting groove is arranged between the upper clamping bar and the lower clamping bar, the first end of the upper clamping bar and the first end of the lower clamping bar are fixedly connected, and the limiting member is detachably connected with the second end of the upper clamping bar and the second end of the lower clamping bar to close the channel of the bar sliding into or sliding out of the mounting groove.

9. The load resistance of claim 8, wherein, The side of the mounting bar away from the load assembly is provided with a connecting structure for fixing the mounting bar.

10. The load resistance of claim 8, wherein, The limiting member is a fastening screw.

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