CN203673903U - Circular distributed resistor support - Google Patents

Abstract

The utility model provides a ring-shaped distributed resistance bracket. The resistance bracket has a symmetrical structure of upper and lower layers. Each layer includes a conductor inner ring and an insulating outer ring. The inner and outer rings are fixedly connected by self-tapping screws; the upper and lower parts of the resistance bracket The two layers are supported and connected by an insulating cylinder. The upper end of the insulating cylinder is fixedly connected to the upper resistance bracket, and the lower end is threaded, and the lower resistance bracket is connected to the lower resistance bracket through a height adjustment nut; the inner ring of the conductor is evenly provided with threaded holes, and each threaded hole is fixed. A resistance connecting rod; a current terminal is set on the inner conductor ring, a voltage terminal is set on the insulating outer ring, and the voltage terminal is connected to the resistance connecting rod on the same layer through a wire. Because the utility model adopts the vertically symmetrical distributed resistance bracket structure, the resistance with a lower load factor can be obtained, and the actual needs such as precision measurement are met.

Description

A ring distributed resistance bracket

technical field

The utility model relates to a resistance structure, in particular to a ring-shaped distributed resistance bracket with a low load factor.

Background technique

As a basic component in the electrical field, resistors are widely used in electronic technology, equipment, industrial control, precision measurement and other fields. Due to the development of electronic technology, the requirements for the reliability and performance of electronic instruments are getting higher and higher. Resistors, as one of the components of electronic circuits, not only require the accuracy of their resistance values, but also their stability, annual change Various characteristics such as rate have put forward requirements. In the field of precision electromagnetic measurement, resistance devices are widely used in the core components of precision electrical measuring instruments, standards in value transmission, precision current sources, and sampling resistors in current sampling measurements. It can be said that the performance of resistors is very good. To a certain extent, it determines the pros and cons of these instruments. However, the resistance value of the resistor in the working state is not fixed. When the resistor flows through the current (under load), it will generate heat, which will cause the temperature of the resistor itself to change, and the resistance value of the resistor will also change accordingly. In general industrial applications, these changes are not very important, but in the field of precision measurement, such as metering, the measurement error caused by self-heating when the resistance is energized must be considered. For example, in the international key comparison of the 100 ohm resistance value, it is stipulated that the current passing through the 100 ohm standard resistance must be 5mA, but when the value of the 100 ohm standard resistance is transferred to 1 ohm, the current passing through the 100 ohm It is 0.5mA. In these two cases, the load of the 100 ohm resistor is different, and the change of the resistance value will cause a certain error in the experimental results. This error must be accurately measured and evaluated.

Therefore, in modern industry, especially in the field of precision measurement, how to reduce the load factor of resistors and improve the stability of resistor devices has always been a technical problem. In addition to the performance of the resistance itself (such as the material of the resistance wire), the factors affecting the performance of the resistance include the structure of the resistance (affecting the heat dissipation under the resistance load), the composition of the resistance components (determining the load of a single unit resistance), etc., if If these points can be properly designed, it is expected to obtain a resistor with a sufficiently small load factor.

Utility model content

The utility model provides a ring-shaped distributed resistance bracket in an embodiment aiming at the demand for low load factor resistors in practice.

The utility model provides an annular distributed resistance support, the resistance support is a symmetrical structure of upper and lower layers, each layer includes a conductor inner ring and an insulating outer ring, and the inner and outer rings are fixedly connected by self-tapping screws; the upper and lower layers of the resistance support It is supported and connected by an insulating cylinder. The upper end of the insulating cylinder is fixedly connected to the upper resistance bracket, and its lower end is threaded, and the lower resistance bracket is connected to the lower resistance bracket through a height adjustment nut; the inner ring of the conductor is uniformly provided with threaded holes, and each threaded hole is fixed with a resistance connection. A rod; a current terminal is provided on the inner conductor ring, a voltage terminal is provided on the insulating outer ring, and the voltage terminal is connected to the resistance connecting rod on the same layer through a wire.

Preferably, the upper and lower layers of the resistance bracket are respectively provided with three insulating support columns.

Preferably, the conductor inner ring is a red copper inner ring, and the insulating outer ring, insulating cylinder, and insulating support column are all polytetrafluoroethylene components.

Preferably, the outer wall of the copper inner ring is provided with a circle of triangular grooves, and self-tapping screws can be screwed in through the threaded holes on the Teflon outer ring.

Preferably, the inner wall of the copper inner ring is provided with several arc-shaped grooves, and the resistance unit can be placed in the grooves.

Preferably, the resistance support further includes a constant temperature oil tank, and the main body of the resistance support is completely placed in the constant temperature oil tank. Further, the constant temperature oil tank is selected from silicone oil tank.

The technical scheme proposed by the utility model adopts a symmetrical distributed resistance bracket structure up and down, and N resistance units are connected in parallel. Compared with a single resistance, under the same load, the load on the resistance element is the original 1/N; The design of the PTFE outer ring forms a good support and isolation effect on the distributed resistors, avoiding the contact between the resistors and the surrounding conductive objects, and ensuring the quality of the resistors; the PTFE cylinder and the height adjustment nut can play a role The function of adjusting the height of the bracket can also be used as a handle when moving the resistance, and it can protect the embedded resistance element. Practice has proved that the resistance bracket of the utility model can obtain a resistance with a lower load factor, which meets the actual needs of precision measurement and the like.

Description of drawings

In order to illustrate the embodiments of the present utility model or the technical solutions in the prior art more clearly, the following will briefly introduce the drawings required for the description of the embodiments or the prior art. Apparently, the accompanying drawings in the following description are only some embodiments of the present invention, and those skilled in the art can obtain other embodiments and accompanying drawings according to the embodiments shown in these drawings.

Fig. 1 is the structural diagram of the ring-shaped distributed resistance bracket of Embodiment 1 of the present utility model;

Fig. 2 is a diagram of the use state of the ring-shaped distributed resistance bracket of the second embodiment of the present invention.

Detailed ways

The technical solutions of the various embodiments of the present invention will be clearly and completely described below in conjunction with the accompanying drawings. Apparently, the described embodiments are only some of the embodiments of the present invention, not all of them. Based on the embodiments of the present invention, all other embodiments obtained by persons of ordinary skill in the art without making creative efforts belong to the protection scope of the present invention.

Fig. 1 is a structure diagram of the ring-shaped distributed resistance bracket of Embodiment 1 of the utility model. As shown in the figure, the ring-shaped distributed resistance bracket is divided into upper and lower layers, and the two-layer structure is completely symmetrical, including a copper inner ring 1, polytetrafluoroethylene Vinyl outer ring 2, self-tapping screw 3, polytetrafluoroethylene cylinder 4, current terminal 5, voltage terminal 6, support column 7, height adjustment nut 8, resistance connecting rod 9.

In this embodiment, the red copper inner ring 1 and the polytetrafluoroethylene outer ring 2 are connected and fixed by self-tapping screws 3, and several threaded holes are evenly arranged on the red copper inner ring 1, and a resistance connecting rod 9 is fixed in each threaded hole. , during actual use, the two ends of the resistance unit are fixed on the resistance connecting rods 9 corresponding to the upper and lower layers. At the same time, the upper and lower resistance brackets are supported and connected by the polytetrafluoroethylene cylinder 4, the upper end of the polytetrafluoroethylene cylinder 4 is fixedly connected with the upper resistance bracket, and the lower end is screwed with the lower resistance bracket, that is, the lower end of the polytetrafluoroethylene cylinder 4 It is a longer threaded part, and it is connected to the resistance bracket of the lower layer through the height adjustment nut 8, and the height of the bracket can be adjusted by adjusting the height adjustment nut 8. In addition, a current terminal 5 is set on the copper inner ring 1 as the current terminal for the four-wire connection of the resistance, and a voltage terminal 6 is set on the PTFE outer ring 2, and the voltage terminal 6 is connected to the same layer through the wire. The resistor connecting rod 9 is connected. Moreover, the upper and lower layers of the resistance bracket in this embodiment are respectively provided with three support columns 7 to ensure the suspension and stability of the resistance.

In this embodiment, an arc-shaped groove is provided on the inner wall of the copper inner ring 1 , and the resistance unit can be placed in the groove during actual use, so as to improve space utilization efficiency and reduce the volume of the resistance bracket.

When the resistance bracket of this embodiment is used, the copper inner ring 1 of the upper and lower layers can be connected with the polytetrafluoroethylene outer ring 2, the angle is adjusted, and the self-tapping screw 3 is tightened to fix it; then the resistance connecting rods 9 are all fixed On the threaded hole between the copper inner ring grooves, the resistance unit is fixedly connected to the resistance connecting rod 9 corresponding to the upper and lower layers to form a distributed structure; then the upper and lower layers are connected with a polytetrafluoroethylene cylinder 4, according to For the length of the unit, adjust the height adjustment nut 8 to a suitable height and then fix the nut; then, install three supporting columns 7 on the upper and lower floors, so that the upper and lower floors are kept at a sufficient distance from the ground; The voltage outlet terminal 6 on the vinyl outer ring 2 is connected to the nearest resistance connecting rod 9 on this layer; the connection wires are respectively drawn from the current outlet terminal 5 and the voltage outlet terminal 6, and connected to precision measuring instruments, and the characteristics are tested by four-terminal connection method.

In another embodiment of the utility model, a circle of triangular grooves is provided on the outer wall of the copper inner ring 1, through several threaded holes on the Teflon outer ring 2, self-tapping screws 3 can be screwed in to connect the inner and outer rings more firmly. .

Figure 2 is a diagram of the use state of the annular distributed resistance bracket of the second embodiment of the utility model. The resistance bracket of this embodiment is provided with a constant temperature oil tank 10 on the basis of the first embodiment, which is suitable for applications with higher requirements for low load factors. Situation, as shown in the figure, the main body of the resistance bracket is completely placed in the constant temperature oil tank 10, and the precision measuring instrument 11 is connected to the precision measuring instrument 11 by four-wire connection for resistance performance testing, and the constant temperature oil is silicone oil.

In the above embodiment, the structural design of the copper inner ring plays the role of connecting the resistors, ensuring the distributed structure of the resistors and realizing the parallel connection of N resistors. Compared with a single resistor, under the same load, the resistance on the resistor element The load is the original 1/N; the design of the PTFE outer ring forms a good support and isolation effect on the distributed resistors, avoiding the contact between the resistors and surrounding conductive objects, and ensuring the quality of the resistors; PTFE The cylinder and the height adjustment nut can adjust the height of the bracket, and can also be used as a handle when moving the resistor to protect the embedded resistor element.

Apparently, those skilled in the art can make various changes and modifications to the utility model without departing from the spirit and scope of the utility model. In this way, if these modifications and variations of the utility model fall within the scope of the claims of the utility model and equivalent technologies thereof, the utility model also includes these modifications and variations.

Claims (7)

1. a ring-shape distribution resistor cartridge, is characterized in that, this resistor cartridge is upper and lower two-layer symmetrical structure, and every layer comprises ring (1) in conductor, insulation outer shroud (2), and this inner and outer ring is fixedly connected with by self-tapping screw (3); The upper end of this insulative cylinders (4) is fixedly connected with upper resistors support by insulative cylinders (4) support and connection for described resistor cartridge upper and lower two-layer, and its lower end is screw thread, connects lower resistors support by height adjusting nut (8); In described conductor, ring (1) evenly arranges screwed hole, fixed resistance connecting rod (9) in each screwed hole; In described conductor, on ring (1), current terminal (5) is set, voltage terminal (6) is set on described insulation outer shroud (2), this voltage terminal (6) is connected with the resistance connecting rod (9) of same layer by wire.

2. ring-shape distribution resistor cartridge according to claim 1, is characterized in that, described resistor cartridge levels is respectively equipped with three eradication edge support columns (7).

3. ring-shape distribution resistor cartridge according to claim 2, is characterized in that, in described conductor, ring (1) is ring in red copper, and described insulation outer shroud (2), insulative cylinders (4), insulating supporting post (7) are polytetrafluoroethylene parts.

4. ring-shape distribution resistor cartridge according to claim 3, is characterized in that, in described red copper, the outer wall of ring is provided with a circle triangle groove, by the screwed hole on polytetrafluoroethylene outer shroud, can screw in self-tapping screw (3).

5. ring-shape distribution resistor cartridge according to claim 4, is characterized in that, in described red copper, the inwall of ring is provided with some arc grooves, resistance unit can be placed in to this groove.

6. ring-shape distribution resistor cartridge according to claim 5, is characterized in that, this resistor cartridge also comprises thermostatic oil bath, and resistor cartridge main body is placed in thermostatic oil bath completely.

7. ring-shape distribution resistor cartridge according to claim 6, is characterized in that, described thermostatic oil bath is silicone oil groove.

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