Modular load

Abstract

The utility model discloses a modularized load, which comprises a box body, two longitudinal ends of the box body are provided with openings, one opening of the box body is fixedly connected with a fan, a plurality of resistor units are sequentially arranged in the box body along the longitudinal direction, and each resistor unit comprises a frame body and a resistance tape wound in the frame body in a snake shape. Air blown out by the fan blows through the frame body, the frame body is detachably connected with the box body, and two wiring terminals are fixedly arranged on the frame body. According to the requirement of a load, the resistor units with corresponding resistance values are inserted into the box body from the jacks at the top of the box body, and the resistor units can be connected in series or in parallel so as to obtain the required resistance value. Therefore, when the resistance value required by the load is changed, the whole modularized load does not need to be replaced, and only the corresponding resistor unit needs to be replaced or the wiring mode of the resistor unit needs to be changed, so that the manpower can be saved, the working efficiency is improved, the equipment investment can be saved, and the aim of reducing the cost is fulfilled.

Description

Technical Field

[0001] This utility model relates to the field of resistor technology, and in particular to a modular load. Background Technology

[0002] The load resistor of high-power equipment generates heat during operation due to the large power it produces, leading to an elevated temperature. Overheating of the load resistor can easily cause a short circuit or damage. Therefore, a heat dissipation device is needed to dissipate the heat generated by the load resistor and ensure that the equipment temperature remains within the normal range.

[0003] Existing methods for heat dissipation in high-power equipment mainly employ forced air cooling. The fan forces air to come into contact with the surface of the heat source, carrying away the heat from the surface. The airflow driven by the fan dissipates the heat, thus achieving the effect of heat dissipation.

[0004] However, the heat dissipation area of ​​ordinary resistors is usually limited to their surface. Therefore, heat concentrates on the surface, while the deeper layers are difficult to dissipate effectively, resulting in uneven heat distribution. Because resistive elements are small, their heat dissipation area is correspondingly small, leading to relatively poor heat dissipation. The metal wires in the resistor coil have a low thermal conductivity, further hindering heat dissipation. To improve heat dissipation, the heat dissipation area of ​​the load resistor's casing is increased, increasing heat dissipation and dispersing the heat, thereby reducing the load resistor's temperature. However, this results in excessively large and heavy equipment. Furthermore, existing load resistors have fixed resistance values; only one value is available. Adjusting the resistance value requires replacing the load resistor with a different one, increasing both workload and equipment investment.

[0005] Patent CN207038270U discloses a load resistor for open-loop low-current testing of a generator excitation system. The load resistor includes a heat-insulating base plate, a wound resistor mounted on the base plate, and a cooling fan. The wound resistor, fixed above the heat-insulating base plate, includes a bakelite frame and a resistance wire wound on the bakelite frame. Because the resistance wire has a small surface area and is wound in the same direction on the wooden frame, air can only blow across the surface of the resistance wire and cannot pass through it. Therefore, not only is the heat dissipation effect poor, but the uniform winding direction of the resistance wire also leads to excessive inductance.

[0006] Patent CN211907122U discloses a device for heat dissipation with a resistive strip, including a ventilation section and an air-exhausting section that cooperates with the ventilation section. A resistive strip arrangement area is also provided between the ventilation section and the air-exhausting section. By setting the resistive strip, the efficiency of heat removal can be improved and heat accumulation can be avoided. However, its resistance value is also fixed. If the resistance value of the load resistor needs to be adjusted, a different load resistor needs to be replaced. Utility Model Content

[0007] The technical problem to be solved by this utility model is to improve a modular load, which solves the problem that when the resistance value of the load resistor is fixed, different load resistors need to be replaced when the resistance value needs to be changed, which is labor-intensive and has high equipment costs.

[0008] To solve the above-mentioned technical problems, the technical solution adopted by this utility model is as follows:

[0009] A modular load includes a housing with openings at both ends along its longitudinal direction. A fan is fixedly connected to one of the openings in the housing. Several resistor units are arranged longitudinally inside the housing. Each resistor unit includes a frame and a resistor strip wound in a serpentine shape around the frame. Air blown by the fan passes through the frame. The frame is detachably connected to the housing. Two terminals are fixedly provided on the frame, and the two terminals are respectively connected to the two ends of the resistor strip.

[0010] Furthermore, the box body is a rectangular cylinder, the frame body is a square frame, and the top of the box body has a rectangular insertion hole corresponding to each frame body. The insertion holes are all horizontal. The top of the frame body is located inside the insertion hole. The two sides of the frame body are vertically slidably connected to the inner wall of the corresponding side of the box body. The bottom of the frame body abuts against the bottom of the inner wall of the box body.

[0011] Furthermore, a blocking plate is rotatably connected to one side of the socket inside the box. A torsion spring is provided between the blocking plate and the box. When the frame is pulled out of the socket, the blocking plate flips upward under the action of the torsion spring and blocks the socket.

[0012] Furthermore, the side of the frame is provided with a vertical sliding groove, and a sliding strip that slides in cooperation with the sliding groove is fixedly installed on the box. Hollow knife grooves are provided at intervals along the vertical edge of the sliding groove.

[0013] Furthermore, the blocking plate is a rectangular strip, with both ends of the blocking plate close to the inner wall of the box. The distance between the top of the slide bar and the top surface of the inner wall of the box is greater than the width of the blocking plate, and the lower end of the slide groove is herringbone-shaped.

[0014] Furthermore, the enclosure has vertically distributed baffles between two adjacent resistor units. The baffles are all fixedly connected to the enclosure and are all inclined. The baffles on both sides of the same resistor unit are staggered.

[0015] Furthermore, the bottom of the inner wall of the box is provided with blocks on both sides of the frame, and the side of the block closest to the frame is a slope, which gradually approaches the block from top to bottom.

[0016] The positive effects of this utility model are:

[0017] This utility model features a housing with openings at both ends and a fan at one end. Several resistor units are detachably connected to the housing. Each resistor unit includes a frame and a resistor strip wound in a serpentine pattern within the frame. Resistor units with the appropriate resistance value are inserted into the housing through sockets on the top of the housing according to the load requirements. The resistor units can be connected in series or parallel to obtain the desired resistance value. Therefore, when the required resistance value of the load changes, it is not necessary to replace the entire modular load; only the corresponding resistor unit or the wiring method of the resistor unit needs to be replaced. This saves manpower, improves work efficiency, and reduces equipment investment, thereby lowering costs. Attached Figure Description

[0018] Figure 1 This is a schematic diagram of the structure of this utility model;

[0019] Figure 2 yes Figure 1 A cross-sectional view of the AA section;

[0020] Figure 3 yes Figure 2 A schematic diagram of the middle resistance unit;

[0021] Figure 4 yes Figure 3 Side view;

[0022] In the picture:

[0023] 1. Protective netting; 2. Terminal block; 3. Enclosure; 4. Frame; 5. Block; 6. Socket; 7. Fan; 8. Stop block; 9. Sliding bar; 10. Spoiler; 11. Empty knife groove; 12. Pull ring; 13. Resistor strip; 14. Handle; 15. Slide groove. Detailed Implementation

[0024] For ease of description, in the following description, the direction that is consistent with the axis of fan 7 is "longitudinal", and the direction that is perpendicular to the axis of fan 7 in the horizontal plane is "lateral".

[0025] Example 1

[0026] like Figures 1 to 4 As shown, a modular load includes a housing 3 with a rectangular cross-section. The housing 3 has openings at both the left and right ends along its longitudinal direction. A fan 7 is fixedly connected to the opening at the right end of the housing 3. The fan 7 is an axial flow fan with a protective cover. A protective mesh 1 is fixedly connected to the opening at the left end of the housing 3.

[0027] The housing 3 contains several resistor units arranged longitudinally. Each resistor unit includes a frame 4 and a resistor strip 13 wound in a serpentine pattern within the frame 4. The resistor strip 13 is strip-shaped with a large surface area, which improves heat dissipation. The frame 4 has U-shaped pull rings 12 distributed at both the top and bottom, with the upper and lower pull rings 12 staggered. The resistor strip 13 serpentinely wraps around each pull ring 12. The fan 7 blows air longitudinally from right to left through the frame 4. The frame 4 is detachably connected to the housing 3. Two terminals 2 are fixedly installed through the top of the frame 4, near both sides of the frame 4. The two terminals 2 are connected to the two ends of the resistor strip 13, and a U-shaped handle 14 fixedly connected to the top of the frame 4 is provided between the two terminals 2.

[0028] The frame 4 is square-shaped. The top of the box 3 has a rectangular insertion hole 6 at a position corresponding to each frame 4. The insertion holes 6 are all horizontal. The top of the frame 4 is located inside the insertion hole 6. The two sides of the frame 4 are vertically slidably connected to the inner wall of the box 3 on the corresponding side. The bottom of the frame 4 abuts against the bottom of the inner wall of the box 3.

[0029] According to the load requirements, the corresponding resistance unit is inserted into the housing 3 through the socket 6. The terminals 2 of each resistance unit can be connected in series or parallel to obtain the required resistance value. Therefore, when the required resistance value of the load changes, it is not necessary to replace the entire modular load. Only the corresponding resistance unit or the connection method of the terminals 2 on the resistance unit needs to be replaced. This saves manpower and equipment investment, thereby reducing costs.

[0030] Example 2

[0031] The difference between this embodiment and Embodiment 1 is that:

[0032] A blocking plate 5 is rotatably connected to the top surface of the inner side of the housing 3 on the left side of the socket 6. The blocking plate 5 is a rectangular strip, and a torsion spring is provided between the blocking plate 5 and the housing 3. When the frame 4 is pulled out of the socket 6, the left side of the blocking plate 5 flips upward under the elastic action of the torsion spring, blocking the socket 6, thereby preventing air leakage from the housing 3 through the socket 6 and affecting the heat dissipation effect. In use, the unnecessary resistor unit can be removed, so that the airflow inside the housing 3 is smoother, thereby improving the heat dissipation effect.

[0033] The frame 4 has vertical grooves 15 on both sides. Sliding strips 9 are fixedly installed on the two side walls inside the housing 3, respectively, to slide in conjunction with the corresponding grooves 15. Three empty slots 11 are vertically spaced along the groove 15, with the width of the empty slots 11 being greater than the width of the groove 15. During processing, the three empty slots 11 are first machined on the side of the frame 4, and then the grooves 15 are machined. This reduces the machining length of the grooves 15, making machining more time-efficient and ensuring higher precision. Furthermore, the reduced contact length between the grooves 15 and the sliding strips 9 makes inserting and removing the frame 4 easier and less strenuous.

[0034] Both ends of the blocking plate 5 are close to the inner wall of the housing 3. The distance between the top of the slider 9 and the top surface of the inner wall of the housing 3 is greater than the width of the blocking plate 5, thereby preventing the blocking plate 5 from interfering with the slider 9 when it swings. The lower end of the slide groove 15 is herringbone-shaped, making it easier to insert the lower end of the slide groove 15 into the top of the slider 9.

[0035] The bottom of the inner wall of the housing 3 is provided with blocks 8 on both sides of the frame 4. The blocks 8 are inclined surfaces near the inside of the frame 4, and these inclined surfaces gradually approach the blocks 8 from top to bottom. When the frame 4 slides from top to bottom, it can smoothly slide between the two blocks 8 under the action of these inclined surfaces, thus limiting the bottom of the frame 4.

[0036] Example 3

[0037] like Figure 1 As shown, the difference between this embodiment and Embodiment 1 is that:

[0038] The housing 3 has rectangular strip-shaped baffles 10 distributed vertically between two adjacent resistor units. The baffles 10 are all fixedly connected to the housing 3. The baffles 10 are all inclined. The inclined directions of two adjacent baffles 10 are opposite. The baffles 10 on both sides of the same resistor unit are staggered vertically.

[0039] When the wind blows from right to left across the baffle 10, the baffle 10 disturbs the air inside the housing 3, causing the air inside the housing 3 to form turbulence, thereby improving the heat dissipation effect (if the baffle 10 is not set, the air inside the housing 3 is laminar flow. When the wind passes through the resistor strip 13, only the wind near the surface of the resistor strip 13 exchanges heat with the resistor strip 13, and the rest of the wind will directly pass through the gaps between the resistor strips 13, resulting in poor heat dissipation).

[0040] The above-described embodiments are detailed and specific, illustrating preferred embodiments of the present utility model. They are only used to illustrate the technical ideas and features of the present utility model, with the aim of enabling those skilled in the art to understand the content of the present utility model and implement it accordingly. However, they are not limited to the present utility model, and the patent scope of the present utility model cannot be limited by this embodiment alone. That is, any equivalent changes or modifications made to the spirit disclosed in the present utility model, without departing from the structure of the present utility model, such as local improvements within the system and modifications or transformations between subsystems, are still within the patent scope of the present utility model.

Claims

1. A modular load, characterized in that, The enclosure includes a housing (3), with openings at both ends of the housing (3) along its longitudinal direction. A fan (7) is fixedly connected to one of the openings of the housing (3). Several resistor units are arranged sequentially along the longitudinal direction inside the housing (3). Each resistor unit includes a frame (4) and a resistor strip (13) that is serpentinely wound inside the frame (4). The air blown out by the fan (7) blows through the frame (4). The frame (4) is detachably connected to the housing (3). Two terminals (2) are fixedly provided on the frame (4). The two terminals (2) are respectively connected to the two ends of the resistor strip (13).

2. A modular load according to claim 1, characterized in that, The box (3) is a rectangular cylinder, and the frame (4) is a square frame. The top of the box (3) and the corresponding position of each frame (4) are provided with rectangular insertion holes (6). The insertion holes (6) are all horizontal. The top of the frame (4) is located inside the insertion holes (6). The two sides of the frame (4) are vertically slidably connected to the inner wall of the box (3) on the corresponding side. The bottom of the frame (4) abuts against the bottom of the inner wall of the box (3).

3. A modular load according to claim 2, characterized in that, The box (3) has a blocking plate (5) rotatably connected to one side of the socket (6). A torsion spring is provided between the blocking plate (5) and the box (3). When the frame (4) is pulled out of the socket (6), the blocking plate (5) flips upward under the action of the torsion spring and blocks the socket (6).

4. A modular load according to claim 3, characterized in that, The side of the frame (4) is provided with a vertical sliding groove (15), and the box (3) is fixedly provided with a sliding strip (9) that slides in cooperation with the sliding groove (15). The sliding groove (15) is provided with empty knife grooves (11) at intervals along the vertical direction.

5. A modular load according to claim 4, characterized in that, The blocking plate (5) is a rectangular strip. Both ends of the blocking plate (5) are close to the inner wall of the box (3). The distance between the top of the slide bar (9) and the top surface of the inner wall of the box (3) is greater than the width of the blocking plate (5). The lower end of the slide groove (15) is herringbone shaped.

6. A modular load according to claim 1, characterized in that, The housing (3) has baffles (10) distributed vertically between two adjacent resistor units. The baffles (10) are all fixedly connected to the housing (3). The baffles (10) are all inclined. The baffles (10) on both sides of the same resistor unit are staggered.

7. A modular load according to claim 1, characterized in that, The bottom of the inner wall of the box (3) is provided with a stop block (8) on both sides of the frame (4). The side of the stop block (8) close to the frame (4) is a slope, which gradually approaches the stop block (8) from top to bottom.

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