CN210073513U

CN210073513U - Precision wire-wound resistor

Info

Publication number: CN210073513U
Application number: CN201920894539.4U
Authority: CN
Inventors: 赵君; 薛慢慢; 邱天娇
Original assignee: Shandong Hangtian Zhenghe Electronic Co Ltd
Current assignee: Shandong Hangtian Zhenghe Electronic Co Ltd
Priority date: 2019-06-14
Filing date: 2019-06-14
Publication date: 2020-02-14
Anticipated expiration: 2029-06-14

Abstract

The utility model discloses an accurate wire-wound resistor relates to resistor technical field, including aluminum alloy shell, aluminum alloy shell's surface is provided with lug and recess, the intermediate position department of support is provided with the connecting piece, ceramic skeleton's surface is provided with the louvre, it has insulating heat-conducting layer to fill between ceramic skeleton and the aluminum alloy shell, the inside of fixed plate is provided with the cooling tube. The utility model discloses after the access circuit, the resistor work produces the heat, some transmits through insulating heat-conducting layer and dispels the heat for aluminum alloy housing, lug and recess through setting up, heat radiating area has been increased, the radiating effect has been improved, inside another part gets into ceramic skeleton through the louvre, discharge through the cooling tube, the radiating rate has been improved, avoid the resistor because of the damage or the production test error that the high temperature leads to, through connecting piece and the support that sets up, can play the elastic fixation effect.

Description

Precision wire-wound resistor

Technical Field

The utility model relates to a resistor technical field specifically is an accurate wire-wound resistor.

Background

The wire-wound resistor is made up by using constantan, manganin or nickel-complex gold wire and winding them on the ceramic skeleton, and its surface is equipped with protective paint or glass glaze, and its resistance wire is made up by using alloy of nickel-chromium and manganin with a certain resistivity, and its insulating skeleton is made up by using ceramic, plastic and metal skeleton coated with insulating layer, and has the characteristics of small temp. coefficient and high accuracy.

After the circuit is connected, the resistor generates tiny resistance change due to the rise of the temperature of the resistor, the heat dissipation effect of the resistor is poor, the resistor is damaged or test errors are generated, and when the resistor support is installed, the resistor support is prone to being skewed, and connection is not stable.

SUMMERY OF THE UTILITY MODEL

The utility model aims to provide a: in order to solve the problems that after a circuit is connected, the resistor generates tiny resistance change due to the rise of the temperature of the resistor, the heat dissipation effect of the resistor is poor, the resistor is damaged or a test error is generated, and when a resistor support is installed, the resistor support is prone to being skewed, so that connection is unstable, a precision wire-wound resistor is provided.

In order to achieve the above object, the utility model provides a following technical scheme: the utility model provides an accurate wire-wound resistor, includes aluminum alloy housing, aluminum alloy housing's surface is provided with lug and recess, the both sides on aluminum alloy housing top all are provided with binding post, aluminum alloy housing's both ends all are provided with the fixed plate, the one end that aluminum alloy housing was kept away from to the fixed plate is installed the support, the intermediate position department of support is provided with the connecting piece, aluminum alloy housing's inside is provided with ceramic skeleton, ceramic skeleton's surface is provided with the louvre, ceramic skeleton's surface winding has the resistance wire, it has insulating heat-conducting layer to fill between ceramic skeleton and the aluminum alloy housing, the inside of fixed plate is provided with the cooling tube, the inside of cooling tube.

Preferably, the number of the convex blocks and the grooves is multiple, and the convex blocks and the grooves are uniformly distributed at intervals.

Preferably, the connecting piece is of an S-shaped structure, the cross section of the support is of an L-shaped structure, and the bottom end of the support is provided with a mounting hole.

Preferably, the material of the insulating and heat conducting layer is a mixture of aluminum nitride and boron nitride powder.

Preferably, the ceramic framework is a hollow cylindrical structure, and the plurality of heat dissipation holes are uniformly distributed on the surface of the ceramic framework.

Preferably, both ends of the radiating pipe respectively extend to the inner side of the ceramic framework and the outer side of the bracket, and one end of the radiating pipe close to the bracket is provided with a dustproof net.

Compared with the prior art, the beneficial effects of the utility model are that: the utility model discloses after inserting the circuit, the resistor work produces the heat, some transmits through insulating heat-conducting layer and dispels the heat for aluminum alloy housing, lug and recess through setting up, heat radiating area has been increased, the radiating effect has been improved, inside another part gets into ceramic skeleton through the louvre, discharge through the cooling tube, the radiating rate has been improved, avoid the resistor because of the damage or the production test error that the high temperature leads to, connecting piece and support through setting up, can play the elastic fixation effect, be convenient for install and weld, be difficult to the landing, moisture in the dampproofing pearl absorption air through setting up, avoid the moisture to lead to the damage of resistor.

Drawings

Fig. 1 is a schematic structural view of the present invention;

FIG. 2 is a schematic structural view of the ceramic frame of the present invention;

FIG. 3 is a schematic view of the internal structure of the present invention;

fig. 4 is a schematic view of the internal structure of the fixing plate of the present invention.

In the figure: 1. an aluminum alloy housing; 2. a fixing plate; 3. a support; 4. a connecting member; 5. a wiring terminal; 6. a bump; 7. a groove; 8. a radiating pipe; 9. a dust screen; 10. a ceramic skeleton; 11. heat dissipation holes; 12. a resistance wire; 13. an insulating heat-conducting layer; 14. moisture-proof beads.

Detailed Description

The technical solutions in the embodiments of the present invention will be described clearly and completely with reference to the accompanying drawings in the embodiments of the present invention, and it is obvious that the described embodiments are only some embodiments of the present invention, not all embodiments. Based on the embodiments in the present invention, all other embodiments obtained by a person skilled in the art without creative work belong to the protection scope of the present invention.

Referring to fig. 1-4, a precision wire-wound resistor, including aluminum alloy shell 1, aluminum alloy shell 1's surface is provided with lug 6 and recess 7, aluminum alloy shell 1's both sides on top all are provided with binding post 5, aluminum alloy shell 1's both ends all are provided with fixed plate 2, fixed plate 2 is kept away from aluminum alloy shell 1's one end and is installed support 3, support 3's intermediate position department is provided with connecting piece 4, aluminum alloy shell 1's inside is provided with ceramic skeleton 10, ceramic skeleton 10's surface is provided with louvre 11, ceramic skeleton 10's surface winding has resistance wire 12, it has insulating heat-conducting layer 13 to fill between ceramic skeleton 10 and the aluminum alloy shell 1, the inside of fixed plate 2 is provided with cooling tube 8, the inside of cooling tube.

After the circuit is inserted, the work of resistor produces heat, some transmits through insulating heat-conducting layer 13 and dispels the heat for aluminum alloy housing 1, lug 6 and recess 7 through setting up, heat radiating area has been increased, the radiating effect has been improved, inside another part gets into ceramic skeleton 10 through louvre 11, discharge through cooling tube 8, the radiating rate has been improved, avoid the resistor because of the damage or the production test error that the high temperature leads to, connecting piece 4 and support 3 through setting up, can play the elastic fixation effect, be convenient for installation and welding, be difficult to the landing, moisture in 14 absorption air through the dampproofing pearl that sets up, avoid the moisture to lead to the damage of resistor.

Please refer to fig. 1, the number of the protrusions 6 and the grooves 7 is plural, the protrusions 6 and the grooves 7 are uniformly distributed at intervals, the connecting member 4 is in an S-shaped structure, the cross section of the bracket 3 is in an L-shaped structure, and the bottom end of the bracket 3 is provided with a mounting hole.

Through a plurality of lugs 6 and recess 7 that set up, heat radiating area has been increased, has improved the radiating effect, and lug 6 and recess 7 'S shape also can be "S" shape structure, and the connecting piece 4 of "S" shape structure plays elastic fixation' S effect.

Referring to fig. 3, the material of the insulating and heat conducting layer 13 is a mixture of aluminum nitride and boron nitride powders.

When the ratio of the mixture of the aluminum nitride powder and the boron nitride powder is 1: 1, the maximum packing degree is formed among the fillers, the interface thermal resistance is small, the heat conduction network is increased, and the thermal conductivity of the composite material is the best.

Please refer to fig. 2 and 4, the ceramic frame 10 is a hollow cylindrical structure, a plurality of heat dissipation holes 11 are uniformly distributed on the surface of the ceramic frame 10, two ends of the heat dissipation tube 8 respectively extend to the inner side of the ceramic frame 10 and the outer side of the bracket 3, and one end of the heat dissipation tube 8 close to the bracket 3 is provided with a dust screen 9.

The radiating holes 10 and the radiating pipe 8 form a path, so that the air circulation speed is increased, the radiating effect is improved, and dust is prevented from entering the resistor through the dustproof net 9.

The working principle is as follows: after the circuit is connected, the resistor works to generate heat, one part of the heat is transmitted to the aluminum alloy shell 1 through the insulating heat conduction layer 13 to dissipate heat, when the proportion of the mixture of aluminum nitride and boron nitride powder is 1: 1, the maximum stacking degree is formed among fillers, the interface thermal resistance is small, the heat conduction network is increased, the heat conductivity of the composite material is the best at the moment, a plurality of convex blocks 6 and grooves 7 increase the heat dissipation area and improve the heat dissipation effect, the other part of the heat enters the ceramic framework 10 through the heat dissipation holes 11 and is discharged through the heat dissipation pipe 8, the heat dissipation rate is improved, the damage or test error of the resistor caused by overhigh temperature is avoided, the moisture in the air is absorbed by the moisture-proof beads 14, the damage of the resistor caused by moisture is avoided, the dust-proof net 9 prevents dust from entering and influencing the use of the resistor, and the elastic fixing, is convenient for installation and welding and is not easy to slide.

It is obvious to a person skilled in the art that the invention is not restricted to details of the above-described exemplary embodiments, but that it can be implemented in other specific forms without departing from the spirit or essential characteristics of the invention. The present embodiments are therefore to be considered in all respects as illustrative and not restrictive, the scope of the invention being indicated by the appended claims rather than by the foregoing description, and all changes which come within the meaning and range of equivalency of the claims are therefore intended to be embraced therein. Any reference sign in a claim should not be construed as limiting the claim concerned.

Claims

1. A precision wire-wound resistor comprises an aluminum alloy shell (1), and is characterized in that: the surface of the aluminum alloy shell (1) is provided with a convex block (6) and a groove (7), both sides of the top end of the aluminum alloy shell (1) are provided with connecting terminals (5), the two ends of the aluminum alloy shell (1) are respectively provided with a fixing plate (2), one end of the fixing plate (2) far away from the aluminum alloy shell (1) is provided with a bracket (3), a connecting piece (4) is arranged in the middle of the bracket (3), a ceramic framework (10) is arranged in the aluminum alloy shell (1), the surface of the ceramic framework (10) is provided with heat dissipation holes (11), the surface of the ceramic framework (10) is wound with resistance wires (12), an insulating heat conduction layer (13) is filled between the ceramic framework (10) and the aluminum alloy shell (1), the inside of fixed plate (2) is provided with cooling tube (8), the inside of cooling tube (8) is provided with dampproofing pearl (14).

2. A precision wire-wound resistor according to claim 1, characterized in that: the number of the convex blocks (6) and the number of the grooves (7) are both multiple, and the convex blocks (6) and the grooves (7) are uniformly distributed at intervals.

3. A precision wire-wound resistor according to claim 1, characterized in that: the connecting piece (4) is of an S-shaped structure, the cross section of the support (3) is of an L-shaped structure, and the bottom end of the support (3) is provided with a mounting hole.

4. A precision wire-wound resistor according to claim 1, characterized in that: the insulating heat conduction layer (13) is made of a mixture of aluminum nitride powder and boron nitride powder.

5. A precision wire-wound resistor according to claim 1, characterized in that: the ceramic framework (10) is of a hollow cylindrical structure, and the heat dissipation holes (11) are uniformly distributed on the surface of the ceramic framework (10).

6. A precision wire-wound resistor according to claim 1, characterized in that: the both ends of cooling tube (8) extend to the outside of ceramic skeleton (10) inboard and support (3) respectively, and the one end that cooling tube (8) are close to support (3) is provided with dust screen (9).