CN212206409U

CN212206409U - Thermistor

Info

Publication number: CN212206409U
Application number: CN202021223703.8U
Authority: CN
Inventors: 刘爽
Original assignee: Goertek Techology Co Ltd
Current assignee: Goertek Techology Co Ltd
Priority date: 2020-06-28
Filing date: 2020-06-28
Publication date: 2020-12-22
Anticipated expiration: 2030-06-28

Abstract

The utility model belongs to the technical field of the resistance product, especially, relate to a thermistor, including the shell, install the thermistor chip in the shell encloses the cavity and be connected and wear out to the first pin and the second pin in the shell outside with thermistor chip electricity respectively, be equipped with the accent that becomes the cavity intercommunication with the shell and enclose on a lateral wall that the shell corresponds the thermistor chip, still include fixed mounting and carry out heat-conducting flexible heat-conducting piece between accent department can and the thermistor chip. The testee is direct and the contact of flexible heat-conducting piece, and the heat of testee can be passed through on flexible heat-conducting piece transmits thermistor chip, avoids having the clearance and increase the thermal resistance between thermistor and testee, has removed the shell part that corresponds thermistor chip, can reduce the influence of shell to measurement accuracy, the utility model discloses a thermistor has solved the problem that current thermistor's measurement accuracy is low.

Description

Thermistor

Technical Field

The utility model belongs to the technical field of the resistance product, especially, relate to a thermistor.

Background

Generally, a thermistor is mainly composed of a thermistor probe, a lead wire, and a case, and the thermistor is generally made into a two-terminal device, but may be also composed of three or four terminals. The casing end of the thermistor is packaged by adopting materials such as glass, ceramics, epoxy resin and the like, and the packaged casing end is hard, so that a certain gap needs to be kept between the casing end and a measured object during measurement, otherwise collision damage is easily caused. Because the gap between the casing end of the thermistor for measurement and the measured object can form an air isolation layer, the thermal resistance is increased, measurement errors can be caused, and the measurement precision is lower.

SUMMERY OF THE UTILITY MODEL

An object of the utility model is to provide a thermistor aims at solving the problem that current thermistor's measurement accuracy is low.

The utility model discloses a thermistor, thermistor includes the shell, installs thermistor chip in the cavity is enclosed into to the shell and respectively with thermistor chip electricity is connected and is worn out extremely the first pin and the second pin in the shell outside the shell corresponds be equipped with on one side wall of thermistor chip with the shell encloses into the accent of cavity intercommunication, still includes fixed mounting cavity department can with carry out heat-conductive flexible heat-conducting piece between the thermistor chip.

As an improvement, one side of the flexible heat conducting piece, which is positioned in the cavity enclosed by the shell, is attached to the thermistor chip.

As an improvement, a metal heat conducting piece is arranged between the flexible heat conducting piece and the thermistor chip, and two sides of the metal heat conducting piece are respectively attached to the flexible heat conducting piece and the thermistor chip.

As a refinement, the metal heat conducting member is a copper block.

As an improvement, a side of the flexible heat-conducting member remote from the thermistor chip extends to the outside of the case.

As an improvement, the thermistor chip is in a plate shape, and the cavity opening is formed in a side wall of the shell, which is opposite to the side face of the thermistor chip.

As an improvement, the thermal resistance of the flexible heat-conducting member is less than the thermal resistance of the housing.

As a modification, the flexible heat-conducting member is a heat-conducting gel layer or a silicone rubber layer.

Since the technical scheme is used, the utility model discloses a thermistor includes the shell, installs the thermistor chip in the cavity that encloses into the shell and is connected and wear out to the first pin and the second pin in the shell outside with thermistor chip electricity respectively, is equipped with the accent that becomes the cavity intercommunication with the shell and encloses on a lateral wall that the shell corresponds thermistor chip, still includes the flexible heat-conducting piece that fixed mounting carries out heat-conduction between accent department can and the thermistor chip. With flexible heat-conducting piece and the contact of testee, the heat of testee can be through flexible heat-conducting piece transmission to thermistor chip on, during the measurement, the direct and thermistor's of testee flexible heat-conducting piece contact avoids having the clearance and increasing the thermal resistance between thermistor and testee, has removed the shell part that corresponds thermistor chip moreover, can reduce the influence of shell to measurement accuracy, can avoid increasing the thermal resistance and influencing measurement accuracy between testee and thermistor, the utility model discloses a thermistor has solved the problem that current thermistor's measurement accuracy is low.

Drawings

Fig. 1 is a schematic front view of a thermistor according to a first embodiment of the present invention;

fig. 2 is a schematic cross-sectional view of a thermistor according to a first embodiment of the present invention;

fig. 3 is a schematic structural view of a thermistor according to a first embodiment of the present invention in a use state;

fig. 4 is a schematic cross-sectional view of a thermistor according to a second embodiment of the present invention;

the device comprises a shell 11, a shell 12, a thermistor chip 13, a first pin 14, a second pin 15, a flexible heat conducting piece 16, a measured object 17 and a metal heat conducting piece.

Detailed Description

In order to make the objects, technical solutions and advantages of the present invention more clearly understood, the present invention is further described in detail below with reference to the accompanying drawings and embodiments. It should be understood that the specific embodiments described herein are merely illustrative of the invention and are not intended to limit the invention.

Fig. 1 to fig. 4 are schematic structural diagrams of a thermistor according to the present invention, wherein, fig. 1 shows a schematic structural diagram of a thermistor according to a first embodiment of the present invention, fig. 2 shows a schematic structural diagram of a thermistor according to a first embodiment of the present invention, fig. 3 shows a schematic structural diagram of a thermistor according to a first embodiment of the present invention in a use state, and fig. 4 shows a schematic structural diagram of a thermistor according to a second embodiment of the present invention in a cross-sectional view. For the sake of convenience, only the parts relevant to the present invention are shown in the drawings.

First embodiment

As can be seen from fig. 1, 2 and 3, the thermistor includes a housing 11, a thermistor chip 12 installed in a cavity defined by the housing 11, and a first pin 13 and a second pin 14 electrically connected to the thermistor chip 12 and penetrating to the outside of the housing 11, wherein a side wall of the housing 11 corresponding to the thermistor chip 12 is provided with a cavity opening communicated with the cavity defined by the housing 11, and the thermistor further includes a flexible heat-conducting member 15 fixedly installed between the cavity opening and the thermistor chip 12 for conducting heat.

Referring to fig. 3, with flexible heat-conducting piece 15 and the contact of testee 16, the heat of testee 16 can pass through flexible heat-conducting piece 15 and transmit to thermistor chip 12 on, during the measurement, testee 16 directly contacts with thermistor's flexible heat-conducting piece 15, avoids having the clearance and increase the thermal resistance between thermistor and testee 16, and both contact segment's shell mutually when having removed thermistor measurement moreover, can reduce this partial shell to measurement accuracy's influence, can avoid increasing the thermal resistance and influence measurement accuracy between testee 16 and thermistor, the utility model discloses a thermistor has solved the problem that current thermistor's measurement accuracy is low.

The utility model discloses in, the one side that thermistor chip 12 was kept away from to flexible heat-conducting piece 15 extends to the shell 11 outside, at thermistor and 16 contact processes of testee, can make flexible heat-conducting piece 15 inseparabler with the 16 contacts of testee, does benefit to the heat and transmits.

Specifically, the flexible heat conducting member 15 is attached to the thermistor chip 12 at one side of the cavity enclosed by the housing 11.

Generally, in order to further improve the measurement accuracy, the thermal resistance of the flexible heat-conducting member 15 is smaller than that of the case 11.

The utility model discloses in, thermistor chip 12 sets up to platelike, and the accent setting can increase the area of contact between flexible heat-conducting piece 15 and the thermistor chip 12 just to on the lateral wall of thermistor chip 12 side at shell 11, and the heat of being convenient for is transmitted.

In the present invention, the flexible heat-conducting member 15 is a heat-conducting gel layer, a silicone rubber layer, or the like.

Second embodiment

As can be seen from fig. 4, this embodiment is substantially the same as the first embodiment, except that:

a metal heat conducting member 17 is provided between the flexible heat conducting member 15 and the thermistor chip 12, and both sides of the metal heat conducting member 17 are respectively bonded to the flexible heat conducting member 15 and the thermistor chip 12. Because the metal heat conducting piece 17 has better heat conducting performance and small thermal resistance, the influence of the over-thickness of the flexible heat conducting piece 15 on the measurement precision can be avoided, and the method is suitable for the condition that the distance between the thermistor and the object to be measured 16 is longer.

The utility model discloses in, metal heat-conducting member 17 is the copper billet, can certainly also choose for use the metal block that heat conductivility is good such as aluminium.

The above description is only exemplary of the present invention and should not be construed as limiting the present invention, and any modifications, equivalents and improvements made within the spirit and principles of the present invention are intended to be included within the scope of the present invention.

Claims

1. A thermistor comprises a shell, a thermistor chip arranged in a cavity enclosed by the shell, a first pin and a second pin, wherein the first pin and the second pin are respectively electrically connected with the thermistor chip and penetrate out of the outer side of the shell.

2. A thermistor according to claim 1, characterized in that the flexible heat-conducting element is attached to the thermistor chip on the side located inside the cavity enclosed by the housing.

3. A thermistor according to claim 1, characterized in that a metal heat-conducting member is provided between the flexible heat-conducting member and the thermistor chip, and both sides of the metal heat-conducting member are respectively bonded to the flexible heat-conducting member and the thermistor chip.

4. A thermistor according to claim 3, characterized in that the metal heat-conducting member is a copper block.

5. A thermistor according to any of claims 1 to 4, characterized in that the flexible heat-conducting member extends away from the side of the thermistor chip to the outside of the housing.

6. A thermistor according to claim 5, characterized in that the thermistor chip is provided in the form of a plate and the cavity is provided in a side wall of the housing facing the side of the thermistor chip.

7. A thermistor according to claim 1, characterized in that the thermal resistance of the flexible heat-conducting member is smaller than the thermal resistance of the housing.

8. A thermistor according to claim 1, characterized in that the flexible heat-conducting member is a heat-conducting gel layer or a silicone rubber layer.