Series decade disk structure for a direct current multi-value resistor

Abstract

The utility model discloses a series of decade disc structure of direct current multivalue resistor, including resistor, the resistor includes the shell and the annular resistance body in the shell, the top of annular resistance body electric connection has U shaped conducting rack, and the both ends of shell top are equipped with the electric brush contact of electric connection with U shaped conducting rack, and the top of shell is equipped with the adjusting assembly in, and the adjusting assembly includes the protective shell and the adjusting cap of screw thread connection in the top of protective shell, and the protective shell is equipped with two groups and two groups protective shell respectively in the top of shell both sides, through setting adjusting assembly in the resistor, through the rotation of screw rod, make screw rod push the up and down movement of guide rod, control the compression degree of spring, and then flexible adjustment electric brush contact and annular resistance body's pressure of sticking together, realize the adjustment of electric brush contact and annular resistance body's close degree of sticking together, guarantee the stable transmission of resistance value in the use process, improved the reliability of direct current multivalue resistor.

Description

Technical Field

[0001] This utility model belongs to the field of resistor technology, specifically relating to a series decimal disk structure of a DC multi-value resistor. Background Technology

[0002] DC multi-value resistors play a crucial role in electrical measurement, circuit debugging, and many scientific research and industrial applications involving DC circuits. Their series decimal disk structure is the core component for achieving precise resistance value adjustment.

[0003] In current power system relay protection testing, DC multi-value resistors are used to simulate resistance values ​​under various fault conditions to verify the accuracy of relay protection device operation. In a series decimal disk structure, the brush contacts and the ring resistor body need to be in close contact to ensure correct resistance value transmission. Some DC multi-value resistors utilize spring devices to apply pressure to the brush contacts, ensuring they are in contact with the ring resistor body. The spring is mounted on the support structure of the brush contacts and generates elastic force through compression, pushing the brush contacts into close contact with the ring resistor body. However, after prolonged use, the spring is prone to fatigue, and the elastic force gradually weakens, making it difficult to maintain stable pressure. This leads to unreliable contact between the brush contacts and the ring resistor body, potentially causing sudden changes or jumps in resistance value during testing. This can result in malfunctions or failures to operate the relay protection device, affecting normal operation. Utility Model Content

[0004] The purpose of this invention is to provide a series decimal disk structure for a DC multi-value resistor to solve the problems mentioned in the background art.

[0005] To achieve the above objectives, this utility model provides the following technical solution: a series decimal disk structure for a DC multi-value resistor, comprising:

[0006] A resistor includes a housing and an annular resistive element disposed within the housing. The top of the annular resistive element is electrically connected to a U-shaped conductive frame. Brush contacts electrically connected to the U-shaped conductive frame are provided at both ends of the top of the housing. An adjustment assembly for ensuring that the brush contacts are tightly fitted to the annular resistive element is provided within the top of the housing. The adjustment assembly includes a protective shell and an adjustment cap threaded to the top of the protective shell. Two sets of protective shells are provided, with the two sets of protective shells respectively disposed on both sides of the top of the housing. A spring is provided within the protective shell, and the spring pushes the brush contacts to fit tightly against the annular resistive element.

[0007] Preferably, the protective shell is provided with an adjustment block, and the two ends of the adjustment block are slidably connected to the sliding groove provided in the protective shell through a slider. One end of the brush contact slides through the protective shell and is connected to the adjustment block.

[0008] Preferably, the adjusting block is provided with a guide groove and a guide rod is slidably connected in the guide groove.

[0009] Preferably, the adjusting cap has an internal thread, and the protective shell has an external thread. The adjusting cap is threadedly connected to the external thread on the protective shell through the internal thread.

[0010] Preferably, the protective shell has a threaded cylinder inside the top and a threaded rod is threadedly connected inside the threaded cylinder. The top of the threaded rod is connected to the adjusting cap, and the bottom is rotatably connected to the guide rod through a bearing.

[0011] Preferably, the spring is fitted onto the guide rod and both ends of the spring are connected to the fixing plate at the top of the guide rod and the adjusting block, respectively.

[0012] Preferably, the outer shell is connected to fixed ears on both sides.

[0013] Preferably, the outer casing surface is provided with a plurality of heat dissipation grooves.

[0014] Compared with the prior art, the beneficial effects of this utility model are:

[0015] (1) By setting an adjustment component inside the resistor, the screw rod is driven to rotate by rotating the adjustment cap using the screw transmission principle, so that the screw rod pushes the guide rod to move up and down, controlling the compression degree of the spring, and thus flexibly adjusting the contact pressure between the brush contact and the ring resistor body, thereby adjusting the tightness of the contact between the brush contact and the ring resistor body, ensuring the stable transmission of the resistance value during use, improving the reliability of the DC multi-value resistor, and ensuring the safe and stable operation of the power system.

[0016] (2) The sliders at both ends of the adjusting block are slidably connected to the sliding grooves in the protective shell, and the guide grooves in the adjusting block are slidably engaged with the guide rods, which together ensure the stability of the brush contact movement. When the equipment vibrates or is disturbed by external forces, this structure can effectively limit the shaking and displacement of the brush contact.

[0017] (3) The heat dissipation grooves on the surface of the casing significantly improve the heat dissipation capacity of the resistor, preventing the resistor from generating heat due to current during operation, which would affect the stability of the resistance value and the performance of the equipment. Attached Figure Description

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

[0019] Figure 2 This is a cross-sectional view of the present invention;

[0020] Figure 3 This is a schematic diagram of the internal structure of the protective shell of this utility model;

[0021] Figure 4This is a schematic diagram of the structure of the present invention after the adjusting cap is screwed on.

[0022] In the diagram: 1. Resistor; 2. Housing; 3. Ring resistor; 4. U-shaped conductive frame; 5. Brush contact; 6. Protective shell; 7. Adjusting cap; 8. Spring; 9. Adjusting block; 10. Guide groove; 11. Guide rod; 12. Internal thread; 13. External thread; 14. Threaded cylinder; 15. Threaded rod; 16. Fixing lug; 17. Heat dissipation groove. Detailed Implementation

[0023] The technical solutions of the present utility model will be clearly and completely described below with reference to the accompanying drawings of the embodiments. Obviously, the described embodiments are only some embodiments of the present utility model, and not all embodiments. Based on the embodiments of the present utility model, all other embodiments obtained by those of ordinary skill in the art without creative effort are within the protection scope of the present utility model.

[0024] This utility model provides, for example Figure 1-4 The illustrated DC multi-value resistor series decimal disk structure includes:

[0025] Resistor 1 includes a housing 2 and an annular resistor 3 disposed within the housing 2. The top of the annular resistor 3 is electrically connected to a U-shaped conductive frame 4. The top two ends of the housing 2 are provided with brush contacts 5 electrically connected to the U-shaped conductive frame 4. The top of the housing 2 is provided with an adjustment assembly for making the brush contacts 5 fit tightly against the annular resistor 3. The adjustment assembly includes a protective shell 6 and an adjustment cap 7 threaded to the top of the protective shell 6. Two sets of protective shells 6 are provided, and the two sets of protective shells 6 are respectively disposed on both sides of the top of the housing 2. A spring 8 is provided inside the protective shell 6, and the spring 8 pushes the brush contacts 5 to fit tightly against the annular resistor 3.

[0026] The protective shell 6 contains an adjusting block 9. Both ends of the adjusting block 9 are slidably connected to a sliding groove within the protective shell 6 via sliders. One end of the brush contact 5 slides through the protective shell 6 and connects to the adjusting block 9. The adjusting block 9 contains a guide groove 10, and a guide rod 11 is slidably connected within the guide groove 10. This structure restricts the adjusting block 9 to linear movement only in the vertical direction, effectively preventing wobbling or displacement during adjustment and ensuring the accuracy of the brush contact 5's position when adjusting the contact pressure. Simultaneously, the sliding cooperation between the guide groove 10 and the guide rod 11 further enhances the stability of the adjustment process. The sliding of the guide rod 11 within the guide groove 10 makes the adjustment process smoother and more reliable, ensuring that the brush contact 5 and the annular resistor 3 maintain good contact at all times, avoiding resistance fluctuations due to poor contact.

[0027] The adjusting cap 7 has an internal thread 12, and the protective shell 6 has an external thread 13. The adjusting cap 7 is threadedly connected to the external thread 13 on the surface of the protective shell 6 through the internal thread 12. With the use of the threaded connection, the operator can adjust the position of the adjusting block 9 by rotating the adjusting cap 7, thereby changing the preload of the spring 8.

[0028] The protective shell 6 has a threaded cylinder 14 inside its top, and a threaded rod 15 is threadedly connected inside the threaded cylinder 14. The top of the threaded rod 15 is connected to the adjusting cap 7, and the bottom is rotatably connected to the guide rod 11 through a bearing.

[0029] The spring 8 is fitted onto the guide rod 11, and both ends of the spring 8 are connected to the fixing plate at the top of the guide rod 11 and the adjusting block 9, respectively. The spring 8 can generate elastic force. When the adjusting block 9 is subjected to external force, the spring 8 will deform accordingly according to the magnitude and direction of the external force, thereby providing a reverse elastic force to ensure that the brush contact 5 is in close contact with the annular resistor 3.

[0030] The outer casing 2 is connected to two sides with fixing ears 16, which can be connected to the equipment mounting bracket or other fixed components by bolts, screws and other connectors.

[0031] The outer shell 2 has several heat dissipation grooves 17 on its surface. The heat dissipation grooves 17 increase the surface area of ​​the outer shell 2. According to the principles of heat conduction and heat radiation, a larger surface area helps heat to dissipate into the surrounding environment more quickly.

[0032] This DC multi-value resistor features a series decimal disk structure. Its core function is based on the coordinated operation of a ring resistor 3 and brush contacts 5. The ring resistor 3 is composed of multiple resistor segments of equal resistance connected sequentially. When adjusting the contact pressure according to actual needs, the adjusting cap 7 can be rotated clockwise. Due to the threaded transmission, the adjusting cap 7 moves downwards along the protective shell 6, while counterclockwise rotation moves it upwards. The up-and-down movement of the adjusting cap 7 drives the connected threaded rod 15 to move synchronously. The threaded cylinder 14 is threadedly engaged with the threaded rod 15. When the threaded rod 15 rotates, it moves vertically up and down within the cylinder. The lower end of the threaded rod 15 is rotatably connected to the guide rod 11 via a bearing, thus converting the rotational motion of the threaded rod 15 into that of the guide rod. The guide rod 11 moves up and down linearly, passing through the guide groove 10 inside the adjusting block 9. During the up and down movement of the guide rod 11, it will act on the spring 8 mounted on it, compressing or stretching the spring 8. As a key component that provides pressure, the elastic force of the spring 8 will change with its degree of compression or stretching. When the spring 8 is compressed, it will generate a greater elastic force, while when the spring 8 is stretched, the elastic force will decrease accordingly. The change in the elastic force of the spring 8 will then apply different levels of pressure to the adjusting block 9. The adjusting block 9 is connected to the brush contact 5, so the pressure of the brush contact 5 against the annular resistor 3 is finally adjusted. Thus, by applying different levels of pressure to the adjusting block 9, the pressure of the brush contact 5 against the annular resistor 3 can be adjusted.

[0033] The mounting ears 16 connected to both sides of the outer casing 2 are mainly used for mounting and fixing the resistor 1. In practical applications, the mounting ears 16 can be connected to the mounting bracket or other fixed parts of the equipment by bolts, screws and other connectors, so that the resistor 1 can be stably installed in the required position. This prevents the resistor 1 from changing position due to vibration, displacement or other factors during equipment operation, which would affect its normal operation. The heat dissipation grooves 17 on the surface of the outer casing 2 are designed to improve the heat dissipation performance of the resistor 1. During the operation of the resistor 1, the current passing through the resistive element will generate heat. If the heat cannot be dissipated in time, the internal temperature of the resistor 1 will rise, affecting the stability of the resistance value and the service life of the resistor 1. The heat dissipation grooves 17 increase the surface area of ​​the outer casing 2. According to the principles of heat conduction and heat radiation, a larger surface area helps the heat to be dissipated into the surrounding environment more quickly. When the internal temperature of the resistor 1 rises, the heat is conducted from the resistive element to the outer casing 2, and then dissipated through the heat dissipation grooves 17 by heat radiation and air convection, thereby keeping the internal temperature of the resistor 1 within a reasonable range and ensuring the stable operation of the resistor 1.

[0034] Finally, it should be noted that the above description is only a preferred embodiment of the present utility model and is not intended to limit the present utility model. Although the present utility model has been described in detail with reference to the foregoing embodiments, those skilled in the art can still modify the technical solutions described in the foregoing embodiments or make equivalent substitutions for some of the technical features. Any modifications, equivalent substitutions, improvements, etc., made within the spirit and principles of the present utility model should be included within the protection scope of the present utility model.

Claims

1. A series decimal disk structure for a DC multi-value resistor, characterized in that, include: A resistor (1) includes a housing (2) and an annular resistor (3) disposed inside the housing (2). The top of the annular resistor (3) is electrically connected to a U-shaped conductive frame (4). The top two ends of the housing (2) are provided with brush contacts (5) electrically connected to the U-shaped conductive frame (4). The top of the housing (2) is provided with an adjustment assembly for making the brush contacts (5) fit tightly against the annular resistor (3). The adjustment assembly includes a protective shell (6) and an adjustment cap (7) threaded to the top of the protective shell (6). The protective shell (6) is provided in two sets, and the two sets of protective shells (6) are respectively disposed on both sides of the top of the housing (2). The protective shell (6) is provided with a spring (8), which pushes the brush contacts (5) to fit tightly against the annular resistor (3).

2. The series decimal disk structure of a DC multi-value resistor according to claim 1, characterized in that: The protective shell (6) is provided with an adjustment block (9). The two ends of the adjustment block (9) are slidably connected to the sliding groove provided in the protective shell (6) through a slider. One end of the brush contact (5) slides through the protective shell (6) and is connected to the adjustment block (9).

3. The series decimal disk structure of a DC multi-value resistor according to claim 2, characterized in that: The adjusting block (9) is provided with a guide groove (10) and a guide rod (11) is slidably connected in the guide groove (10).

4. The series decimal disk structure of a DC multi-value resistor according to claim 1, characterized in that: The adjusting cap (7) has an internal thread (12), and the protective shell (6) has an external thread (13) on its surface. The adjusting cap (7) is threadedly connected to the external thread (13) on the surface of the protective shell (6) through the internal thread (12).

5. The series decimal disk structure of a DC multi-value resistor according to claim 3, characterized in that: The protective shell (6) has a threaded cylinder (14) inside its top and a threaded rod (15) is threaded inside the threaded cylinder (14). The top of the threaded rod (15) is connected to the adjusting cap (7), and the bottom is rotatably connected to the guide rod (11) through a bearing.

6. The series decimal disk structure of a DC multi-value resistor according to claim 3, characterized in that: The spring (8) is fitted onto the guide rod (11), and both ends of the spring (8) are connected to the fixing plate at the top of the guide rod (11) and the adjusting block (9), respectively.

7. The series decimal disk structure of a DC multi-value resistor according to claim 1, characterized in that: The outer shell (2) is connected to fixed ears (16) on both sides.

8. The series decimal disk structure of a DC multi-value resistor according to claim 1, characterized in that: The outer casing (2) has several heat dissipation grooves (17) on its surface.

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