CN215577978U - Leadless metal film resistor - Google Patents
Leadless metal film resistor Download PDFInfo
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- CN215577978U CN215577978U CN202122072541.3U CN202122072541U CN215577978U CN 215577978 U CN215577978 U CN 215577978U CN 202122072541 U CN202122072541 U CN 202122072541U CN 215577978 U CN215577978 U CN 215577978U
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- iron cap
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- metal film
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Abstract
The utility model discloses a leadless metal film resistor, which comprises a resistance rod, a metal film arranged on the outer surface of the resistance rod, and a resistance wire wound outside the metal film, and also comprises: the resistor outer sleeve is arranged in the middle in a hollow mode, the resistor rod penetrates through the resistor outer sleeve, and the resistor rod is provided with a connecting end extending out of the resistor outer sleeve; the iron cap, it includes integrative outer iron cap and the interior iron cap that sets up, interior iron cap and link fixed connection, and the external diameter of interior iron cap is less than outer iron cap, and the external diameter and the resistance overcoat of outer iron cap are roughly the same, and the tip and the interior iron cap welding of resistance wire form the solder joint on interior iron cap. The utility model has reasonable structural design, effectively reduces or eliminates the height difference between the iron cap and the resistance rod, and has the advantages of difficult touch of welding points and high safety.
Description
Technical Field
The utility model relates to the technical field of resistors, in particular to a leadless metal film resistor.
Background
With the rapid development of electronic technology, resistors are still continuously advancing as an essential component in electronic components. The resistor is generally directly called as a resistor in daily life, the magnitude of the resistance of the resistive element is generally related to temperature, material, length, and also cross-sectional area, and the physical quantity that measures the magnitude of the resistance affected by temperature is the temperature coefficient, which is defined as the percentage of the change in resistance value per 1 ℃ rise in temperature. The main physical characteristic of the resistor is that the electric energy is changed into heat energy, and the resistor can also be called as an energy consumption element, and the electric current generates internal energy through the energy consumption element. The resistor generally plays a role in voltage division and shunt in the circuit.
The metal film resistor is produced by adhering Ni-Cr or similar alloy onto the surface of resistor rod to form film, cutting to regulate resistance, cutting with proper joint, and painting insulating slurry to protect the surface. Because it is a lead wire type resistor, it is convenient for manual installation and maintenance, and can be used in most domestic electric appliances, communication and instruments and meters. Most metal film resistors adopt a winding resistor structure.
The winding resistor is made by winding nickel-chromium wire, manganese copper wire and constantan wire on a resistor rod, and the resistor rod is made of ceramic, plastic, metal coated with an insulating layer and other materials and is in various shapes such as a tube shape, a flat shape and the like. The winding resistor has the characteristics of high resistance precision, high power, low working noise, stability, reliability, high temperature resistance and the like. Most of the existing winding resistors have the following structure: resistance wires are wound on the resistance rods, and pins are led out from the left side and the right side of the resistance rods. And the resistance of above-mentioned structure can only adopt the mode installation of pegging graft, has seted up the jack promptly on the circuit board, and two pins of resistance are followed the jack respectively and are inserted, and after the circuit board passed through wave-soldering, soldering tin can weld the pin in jack department, cuts the pin through cutting the foot machine again. As can be seen from the foregoing, the conventional resistor is very troublesome to produce and process, and has many processes and low production efficiency.
In recent years, a resistor manufacturer designs a patch type winding resistor, and the structure of the winding resistor is as follows: and iron caps are additionally arranged on two sides of the resistance rod, the resistance wire is wound on the resistance rod, and two ends of the resistance wire are welded on the iron caps. However, the above structure has the following drawbacks: firstly, the height difference exists between the iron cap and the resistor rod, so that the resistor is inconvenient to absorb by a chip mounter; secondly, because the solder joint is directly on the iron cap, the resistor is not flat when being attached to the circuit board, and the wire-wound solder joint is easily touched, so that the resistance value of the resistor is easy to lose efficacy, and the safety is not high.
Disclosure of Invention
The utility model overcomes the defects of the prior art, provides the leadless metal film resistor, has reasonable structural design, effectively reduces or eliminates the height difference between the iron cap and the resistor rod, has difficult touch of welding spots and high safety.
In order to achieve the purpose, the utility model provides the following technical scheme:
the utility model provides a leadless metal film resistor, includes the resistance stick, locates the metallic film of resistance stick surface and twines in the outside resistance wire of metallic film, still includes:
the resistor outer sleeve is arranged in the middle in a hollow mode, the resistor rod penetrates through the resistor outer sleeve, and the resistor rod is provided with a connecting end extending out of the resistor outer sleeve;
the iron cap, it includes integrative outer iron cap and the interior iron cap that sets up, interior iron cap and link fixed connection, and the external diameter of interior iron cap is less than outer iron cap, and the external diameter and the resistance overcoat of outer iron cap are roughly the same, and the tip and the interior iron cap welding of resistance wire form the solder joint on interior iron cap.
Preferably, a step stage is formed between the inner iron cap and the resistance outer sleeve and between the inner iron cap and the outer iron cap, and an insulating paint layer is coated on the step stage.
Preferably, the stage is sleeved with a heat-shrinkable rubber ring positioned on the outer side of the insulating paint layer, and the heat-shrinkable rubber ring is flush with the resistor outer sleeve or the outer iron cap.
Preferably, the radial end part of the resistor outer sleeve is provided with a blind hole, the blind hole is internally provided with a reset spring and a hemispherical fixture block connected with the reset spring, and the hemispherical fixture block is abutted to the thermal shrinkage rubber ring.
The utility model has the beneficial effects that:
the utility model has reasonable structural design, effectively reduces or eliminates the height difference between the iron cap and the resistance rod, and has the advantages of difficult touch of welding points and high safety.
Drawings
FIG. 1 is a schematic structural diagram of an embodiment of the present invention;
FIG. 2 is an enlarged view taken at A in FIG. 1;
FIG. 3 is a schematic diagram of a structure of a resistance rod according to an embodiment of the present invention;
FIG. 4 is a schematic diagram of a resistive outer jacket according to an embodiment of the present invention;
FIG. 5 is an enlarged view at B in FIG. 4;
fig. 6 is a schematic structural diagram of an inner iron cap and an outer iron cap according to an embodiment of the present invention.
In the figure: 1. a resistance rod; 11. a metal film; 12. a connecting end; 2. a resistance wire; 3. a resistance outer sleeve; 31. blind holes; 32. a return spring; 33. a hemispherical fixture block; 4. an outer iron cap; 5. an inner iron cap; 6. welding spots; 7. a stage of stage; 71. an insulating paint layer; 72. and (4) a heat-shrinkable rubber ring.
Detailed Description
The technical solutions in the embodiments of the present invention will be clearly and completely described below with reference to the drawings in the embodiments of the present invention, and it is obvious that the described embodiments are only a part of the embodiments of the present invention, and not all of the embodiments. All other embodiments, which can be derived by a person skilled in the art from the embodiments given herein without making any creative effort, shall fall within the protection scope of the present invention.
As shown in fig. 1 to 6, a leadless metal film resistor includes a resistor rod 1, a metal film 11 disposed on an outer surface of the resistor rod 1, and a resistance wire 2 wound outside the metal film 11, and further includes: the resistor outer sleeve 3 is arranged in the hollow, the resistor rod 1 penetrates through the resistor outer sleeve, and the resistor rod 1 is provided with a connecting end 12 extending out of the resistor outer sleeve 3; the iron cap, it includes integrative outer iron cap 4 and the interior iron cap 5 that sets up, interior iron cap 5 and connecting end 12 fixed connection, and the external diameter of interior iron cap 5 is less than outer iron cap 4, and the external diameter of outer iron cap 4 is roughly the same with resistance overcoat 3, and the tip and the interior iron cap 5 welding of resistance wire 2 form solder joint 6 on interior iron cap 5.
By adopting the technical scheme, the resistor outer sleeve 3 is arranged, and the outer diameter of the outer iron cap 4 is approximately the same as that of the resistor outer sleeve 3, so that the height difference does not exist between the iron cap and the resistor rod 1, and the resistor can be conveniently absorbed by a chip mounter; and the welding spot 6 is arranged on the inner iron cap 5, so that the resistor can be kept flat when being attached to a circuit board, the wire-wound welding spot 6 is not easy to touch, and the safety is high.
As a modified embodiment, a step section 7 is formed between the inner iron cap 5 and the resistance outer sleeve 3 and the outer iron cap 4, and the step section 7 is coated with an insulating paint layer 71.
By adopting the technical scheme, the arrangement of the insulating paint layer 71 increases the safety and is convenient for flame-retardant insulation.
As a modified embodiment, the step section 7 is sleeved with a heat-shrinkable rubber ring 72 positioned outside the insulating paint layer 71, and the heat-shrinkable rubber ring 72 is flush with the resistor outer sleeve 3 or the outer iron cap 4.
Through adopting above-mentioned technical scheme, when the setting of pyrocondensation rubber ring 72 ensured the leakproofness, also made the surface of resistance more level and more smooth.
As a modified specific embodiment, a blind hole 31 is formed in the radial end portion of the resistor outer sleeve 3, a return spring 32 and a hemispherical fixture 33 connected with the return spring 32 are arranged in the blind hole 31, and the hemispherical fixture 33 abuts against the heat-shrinkable rubber ring 72.
Through adopting above-mentioned technical scheme, hemisphere fixture block 33 sets up with pyrocondensation rubber ring 72's cooperation, is convenient for to pyrocondensation rubber ring 72's location installation and dismantlement. Wherein, a certain gap may exist between the heat-shrinkable rubber ring 72 and the radial end of the resistance outer sleeve 3, or the heat-shrinkable rubber ring and the radial end of the resistance outer sleeve may be in contact.
The above description is only for the preferred embodiment of the present invention, but the scope of the present invention is not limited thereto, and any person skilled in the art should be considered to be within the technical scope of the present invention, and equivalent alternatives or modifications according to the technical solution of the present invention and the inventive concept thereof should be covered by the scope of the present invention.
Claims (4)
1. The utility model provides a leadless metal film resistor, includes the resistance stick, locates the metallic film of resistance stick surface and twines in the outside resistance wire of metallic film, its characterized in that still includes:
the resistor outer sleeve is arranged in the middle in a hollow mode, the resistor rod penetrates through the resistor outer sleeve, and the resistor rod is provided with a connecting end extending out of the resistor outer sleeve;
the iron cap, it includes integrative outer iron cap and the interior iron cap that sets up, interior iron cap and link fixed connection, and the external diameter of interior iron cap is less than outer iron cap, and the external diameter and the resistance overcoat of outer iron cap are roughly the same, and the tip and the interior iron cap welding of resistance wire form the solder joint on interior iron cap.
2. The leadless sheet metal resistor of claim 1, wherein the inner iron cap and the resistor outer sheath and the outer iron cap form a step therebetween, and the step is coated with an insulating paint layer.
3. The leadless metal film resistor of claim 2 wherein the stage is covered with a heat-shrinkable rubber ring outside the insulating paint layer, the heat-shrinkable rubber ring being flush with the resistor outer cover or the outer iron cap.
4. The leadless metal film resistor of claim 3, wherein the radial end of the resistor outer sheath has a blind hole, and the blind hole has a return spring and a hemispherical stopper connected to the return spring, the hemispherical stopper abuts against the heat shrinkable rubber ring.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202122072541.3U CN215577978U (en) | 2021-08-30 | 2021-08-30 | Leadless metal film resistor |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202122072541.3U CN215577978U (en) | 2021-08-30 | 2021-08-30 | Leadless metal film resistor |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN215577978U true CN215577978U (en) | 2022-01-18 |
Family
ID=79844441
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN202122072541.3U Active CN215577978U (en) | 2021-08-30 | 2021-08-30 | Leadless metal film resistor |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN215577978U (en) |
-
2021
- 2021-08-30 CN CN202122072541.3U patent/CN215577978U/en active Active
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