CN212303258U

CN212303258U - Thermistor

Info

Publication number: CN212303258U
Application number: CN202020805203.9U
Authority: CN
Inventors: 苏伟翔
Original assignee: Xingqin Changzhou Electronic Co ltd
Current assignee: Xingqin Changzhou Electronic Co ltd
Priority date: 2020-05-14
Filing date: 2020-05-14
Publication date: 2021-01-05
Anticipated expiration: 2030-05-14

Abstract

The utility model relates to a thermistor, which comprises a shell, wherein a chip is arranged in the shell, and the chip is contacted with the top of the inner side of the shell through clamping pieces which are arranged in the shell and positioned at two sides of the chip; the clamping piece is provided with a clamping part for clamping the chip, the clamping part extends out of the clamping piece from bottom to top, the connecting part of the clamping part and the clamping piece is the bottom of the clamping part, and the upper part of the clamping part is abutted against the two sides of the chip and fixes the chip on the top of the inner side of the shell through the friction force with the side surface of the chip. The utility model discloses less mounting dimension has to for the chip provides by lower supreme clamping-force, can prevent that the chip from rocking in the casing, thereby improved the anti-seismic performance of product, set up the strong point simultaneously and can effectively prevent that the casing from interfering other subassemblies on the circuit board bottom the casing, provide the stability that the product used.

Description

Thermistor

Technical Field

The utility model relates to an electronic components, especially a surge suppression or the boxed type thermistor of motor starter that on-vehicle MCU used.

Background

With the development of science and technology, the demand for miniaturization and stability of product volume is increasing, and taking a vehicle-mounted product as an example, the size of a shell of a PSB product (inrush current suppression or motor starter box-mounted thermistor) for a vehicle-mounted MCU is 18 × 13.5 × 26.5mm, so that the mounting requirement cannot be well met for a space with limited mounting conditions; moreover, due to the problems of the structure, the PTC chip is suspended in the shell, so that the poor anti-seismic effect is easily caused; meanwhile, under the condition of not in place welding, the shell and other components on the mounting plate interfere with each other, so that the overall use performance of the product is influenced.

SUMMERY OF THE UTILITY MODEL

The to-be-solved technical problem of the utility model is: the thermistor has the characteristics of small volume, good shock resistance, good stability and the like.

The utility model provides a technical scheme that its technical problem adopted is: a thermistor is used for a vehicle-mounted MCU and comprises a shell, wherein a chip is arranged in the shell and is in contact with the top of the inner side of the shell through clamping pieces which are arranged in the shell and positioned at two sides of the chip; the clamping piece is provided with a clamping part for clamping the chip, the clamping part extends out of the clamping piece from bottom to top, the connecting part of the clamping part and the clamping piece is the bottom of the clamping part, and the upper part of the clamping part is abutted against the two sides of the chip and fixes the chip on the top of the inner side of the shell through the friction force with the side surface of the chip. Can provide the chip like this except that there is the clamping-force still have the power that resists the chip slip to protection chip that can be better rocks, the better vibration demand that satisfies the vehicle regulation.

Furthermore, the clamping piece is also provided with an extension part extending out of the shell, and the extension part is provided with a clamping pin which can be inserted into the welding position of the PCB and is fixed with the lower surface of the PCB; a gap is formed between the top of the clamping pin and the bottom of the shell, and the height of the gap is equal to the thickness of the PCB circuit board.

Still further say, casing bottom be provided with the arch, bellied height be 0.1 to 1mm, protruding evenly distributed is in the casing bottom, can prevent like this that the product from interfering other subassemblies on the circuit board when not blocking, further improvement stability when welding the installation.

Furthermore, the shell of the present invention comprises an integrally formed upper shell and a bottom cover disposed at the bottom of the upper shell, and the size of the shell is less than or equal to 17 × 17 × 22.1mm, so as to satisfy the requirement of smaller space size.

Furthermore, the clamping piece be the metalwork, the clamping part is the metal shrapnel by the die-cut of clamping piece itself with the card foot, can assemble better through the deformability performance of metal shrapnel itself like this.

The beneficial effects of the utility model are that, solved the defect that exists among the background art, had less mounting dimension to for the chip provides by lower supreme clamping-force, can prevent that the chip from rocking in the casing, thereby improved the anti-seismic performance of product, set up the strong point simultaneously and can effectively prevent that the casing from interfering other subassemblies on the circuit board, provide the stability of product use.

Drawings

FIGS. 1-4 are schematic structural views of the present invention;

fig. 5 is a schematic view of the present invention mounted to a circuit board;

fig. 6 is a schematic structural diagram of another embodiment of the present invention;

in the figure: 1. a housing; 2. a chip; 3. a clamping member; 4. a protrusion; 5. a circuit board; 11. an upper housing; 12. a bottom cover; 31. a clamping portion; 32. an extension portion; 33. and (7) clamping the pins.

Detailed Description

The invention will now be described in further detail with reference to the drawings and preferred embodiments. These drawings are simplified schematic drawings and illustrate the basic structure of the present invention only in a schematic manner, and thus show only the components related to the present invention.

The thermistor shown in fig. 1-4 is used for an on-vehicle MCU, and comprises a housing 1, wherein the housing 1 comprises an integrally formed upper housing 11 and a bottom cover 12 arranged at the bottom of the upper housing 11, and the size of the housing is less than or equal to 17 × 17 × 22.1mm, so that the thermistor can meet the requirement of smaller space size.

A chip 2 is arranged in the shell 1, and the chip 2 is contacted with the top of the inner side of the shell 1 through clamping pieces 3 which are arranged in the shell 1 and positioned at two sides of the chip 2. According to other embodiments, the chip 2 may also be in contact with the top and bottom covers of the housing 1 at the same time.

As shown in fig. 2, the clamping member 3 has a clamping portion 31 for clamping the chip and an extending portion 32 extending outside the housing 1, the clamping member 3 is a metal member, and the extending portion 32 is provided with a clamping pin 33 capable of being inserted into a soldering position of the PCB circuit board 5 and fixed with the lower surface of the PCB circuit board 5; the latch 33 in fig. 2 is bent inward, but if the size of the housing is reduced, the inwardly bent latch may form a solid obstacle and may interfere with the bottom cover and the upper housing, so according to other embodiments, the latch 33 may also be bent outward, as shown in fig. 6; the clamping portion 31 and the clamping leg 33 are both metal elastic pieces punched out of the clamping member 3, so that the clamping portion 31 extends from the clamping member 3 from bottom to top, the bottom of the clamping portion 31 is used as a connecting portion to be connected with the clamping member 3, and the upper portion of the clamping portion 31 abuts against two sides of the chip 2 and fixes the chip 2 on the top of the inner side of the shell 1 through friction force generated by the surface of the chip. Can provide the chip like this except that there is the clamping-force still have the power that resists the chip slip to protection chip that can be better rocks, the better vibration demand that satisfies the vehicle regulation.

A gap is formed between the top of the clamping pin 33 and the bottom of the shell 1, and the height of the gap is equal to the thickness of the PCB 5. As shown in fig. 5, by such a welding installation manner, no gap exists between the product and the circuit board after the product and the circuit board are installed, and the stability of fixing the product and the PCB circuit board can be improved. In addition, the bottom of the shell 1 is provided with a bulge 4, the bulge 4 can be integrally formed with a bottom cover of the shell, the height of the bulge 4 is 0.1-1 mm, the bulge 4 is uniformly distributed at the bottom of the shell, and the bulge plays a role of a supporting point; as shown in fig. 1 and 4, the protrusions 4 are distributed on the bottom of the housing in a rectangular shape, which can prevent the product from interfering with other components on the circuit board when the product is not stuck, and further improve the stability of the soldering installation.

The utility model discloses can realize miniaturized reason lies in:

(a) the clamping piece is fixed by a fixing piece in the existing shell, the fixing piece can form a lug in the shell, and an accommodating space of the lug needs to be designed in the shell, so that the volume of the shell cannot be reduced. The invention does not need additional fixing parts to fix the clamping part and can reduce the volume of the shell.

(b) The material of the shell is changed from bakelite (phenolic resin) to LCP (liquid crystal polymer) with higher dielectric strength, so that the shell can achieve the same effect of voltage resistance and insulation even if the thickness of the shell is reduced. In addition, the LCP has good flexibility, is convenient for combination design, and can meet the aim of miniaturization.

While the foregoing is directed to embodiments of the present invention, other and further embodiments of the invention may be devised without departing from the basic scope thereof, and the scope thereof is determined by the claims that follow.

Claims

1. A thermistor, comprising a housing, characterized in that: the chip is arranged in the shell and is contacted with the top of the inner side of the shell through clamping pieces which are arranged in the shell and positioned at two sides of the chip; the clamping piece is provided with a clamping part for clamping the chip, the clamping part extends out of the clamping piece from bottom to top, the connecting part of the clamping part and the clamping piece is the bottom of the clamping part, and the upper part of the clamping part is abutted against the two sides of the chip and fixes the chip on the top of the inner side of the shell through the friction force with the side surface of the chip.

2. A thermistor according to claim 1, characterized in that: the clamping piece is also provided with an extension part extending out of the shell, and the extension part is provided with a clamping pin which can be inserted into the welding position of the PCB and is fixed with the lower surface of the PCB; a gap is formed between the top of the clamping pin and the bottom of the shell, and the height of the gap is equal to the thickness of the PCB circuit board.

3. A thermistor according to claim 1, characterized in that: the bottom of the shell is provided with bulges which are uniformly distributed at the bottom of the shell.

4. A thermistor according to claim 3, characterized in that: the height of the projection is 0.1 to 1 mm.

5. A thermistor according to claim 1, characterized in that: the shell comprises an integrally formed upper shell and a bottom cover arranged at the bottom of the upper shell, and the size of the shell is less than or equal to 17 multiplied by 22.1 mm.

6. A thermistor according to claim 2, characterized in that: the clamping piece is a metal piece, and the clamping part and the clamping pin are metal elastic pieces punched by the clamping piece.