CN214502705U

CN214502705U - Practical platinum thermal resistance sensor

Info

Publication number: CN214502705U
Application number: CN202022622464.XU
Authority: CN
Inventors: 王恒
Original assignee: Dandong Changheng Electronics Co ltd
Current assignee: Dandong Changheng Electronics Co ltd
Priority date: 2020-11-13
Filing date: 2020-11-13
Publication date: 2021-10-26
Anticipated expiration: 2030-11-13

Abstract

The utility model discloses a practical platinum resistance sensor relates to platinum resistance sensor's technical field, the sensor main part is the chip, the chip overcoat has the shell, chip one end sets up at the shell the inside, and the pin is connected to the other end, is the crimping and handles, pin outer joint silvered wire. When the current is too large, the current can be guided on the silver coating layer, the chip can be continuously used without being damaged, and the silver layer has good conductive effect and more accurate test.

Description

Practical platinum thermal resistance sensor

Technical Field

The utility model relates to a practical platinum resistance sensor belongs to platinum resistance sensor field.

Background

The platinum thermal resistance sensor measures temperature by utilizing the temperature and resistance linear change characteristics of metal platinum, has stable characteristics, does not generate physical or chemical changes due to high and low temperatures, has temperature-resistance linearity obviously superior to other resistance type sensors, and is widely applied to temperature measurement of petroleum, chemical engineering, aerospace and transmission equipment. At present, the embedded temperature sensor in the domestic motor industry is produced and manufactured according to the embedded thermal resistor for the JB/10500.1-2005 motor. The production process is characterized in that the PT100 chip and the lead are subjected to direct copper tape compression joint, then insulation treatment is carried out, and then packaging is carried out. The prior product has the defects of insensitive response caused by packaging materials or manufacturing and incapability of being used continuously caused by damage of the product caused by overlarge current in the using process.

SUMMERY OF THE UTILITY MODEL

For solving the problem that platinum resistance sensor can't bear too big electric current among the prior art, the utility model provides a practical platinum resistance sensor, concrete technical scheme is as follows:

the utility model provides a practical platinum resistance sensor, the sensor main part is the chip, the chip overcoat has the shell, chip one end sets up at the shell the innermost, and the pin is connected to the other end, does the crimping and handles, pin outer joint silvering wire, the long 1-1.2mm in one corner of chip one end, wide 0.8-1mm part do not cover the silver thick liquid, and all the other parts cover the silver thick liquid, from the outside pin of the outside connection of uncovered silver thick liquid part, from covering another pin of the outside connection of silver thick liquid part, two pins link to each other with the same side of chip, the heat-conducting glue is scribbled to the chip other end, the heat-conducting glue is scribbled into the semi-circle that the radius is 0.5-1 mm.

The chip is a Pt100 chip.

The length of the pin is 2-5 mm.

The beneficial effects of the utility model reside in that: when the current is overlarge, the current can be guided in the silver coating layer, so that the chip can be continuously used without being damaged. Because of the silver layer, the conductive effect is good, and the test is more accurate.

Drawings

Fig. 1 is a schematic structural diagram of an embodiment of the present invention;

Fig. 2 is a distribution diagram of silver paste coating according to an embodiment of the present invention;

fig. 3 is a distribution diagram of the heat-conducting glue coating according to an embodiment of the present invention.

In the figure: 1, a chip; 2, silver plating the lead; 3, a housing; 4, a pin.

Detailed Description

The materials, methods and apparatus used in the following examples, which are not specifically illustrated, are conventional in the art and are commercially available to those of ordinary skill in the art.

In the following description of the present invention, it should be noted that the terms "center", "longitudinal", "lateral", "up", "down", "front", "back", "left", "right", "top", "bottom", "inner", "outer" and "upright" indicate the orientation or positional relationship based on the orientation or positional relationship shown in the drawings, and are only for convenience of description and simplification of the description, but do not indicate or imply that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and thus, should not be construed as limiting the present invention.

In the following description of the present invention, it is to be noted that, unless otherwise explicitly specified or limited, the terms "mounted," "connected," and "connected" are to be construed broadly, and may be, for example, fixedly connected, detachably connected, or integrally connected; the connection may be direct or indirect via an intermediate medium, or the connection may be internal to both components. To those of ordinary skill in the art, the specific meaning of the written terms in the present invention can be understood as a specific case.

In addition, in the following description of the present invention, the meaning of "a plurality", and "a plurality" is two or more unless otherwise specified.

The present invention will be described in further detail with reference to the accompanying drawings, but the following detailed description is not to be construed as limiting the present invention.

As shown in fig. 1-3, a practical platinum thermistor sensor, the sensor main part is chip 1, chip 1 overcoat has

shell

3, 1 one end of chip sets up at shell 3 the innermost, and pin 4 is connected to the other end, does the crimping and handles, pin 4 external connection

silvered wire

2, 1 one end of chip all around and a pin 4 outer evenly cover one deck silver thick liquid, another pin 4 and its all around length 1-1.2mm, wide 0.8-1mm part do not cover the silver thick liquid, the heat conduction glue is scribbled to the chip other end, the heat conduction glue is scribbled into the semi-circular that the radius is 0.5-1 mm.

The chip 1 is a Pt100 chip.

The length of the pin 4 is 2-5 mm.

The preparation method of the utility model is as follows: the method comprises the following steps: feeding, inserting wire and hanging tin, welding a chip, assembling a shell, performing initial inspection, installing a spring assembly, welding a wire terminal, checking, packaging, checking and warehousing.

The steps of welding the chip in the method are as follows: clamping the middle points of the pins of the Pt100 chip by using a clamp, wherein the arrangement directions are consistent; uniformly stirring silver paste, uniformly stirring the silver paste, uniformly coating the silver paste on the periphery and one pin part of the Pt100 chip, and not coating the silver paste on the other pin and the part with the length of 1-1.2mm and the width of 0.8-1 mm; putting the Pt100 chip coated with the silver paste and the clamp into an oven, and drying for 15min at the temperature of 90 +/-5 ℃.

The initial detection, the middle detection and the final detection modes are as follows: and (3) measuring one by using a universal meter, wherein the normal-temperature resistance between the two pins of the Pt100 chip is 109 +/-3 omega, the resistance difference of the same batch is less than or equal to 0.3 omega, and the resistance difference between the silver-coated pin and the silver-coated layer of the Pt100 chip is less than or equal to 0.5 omega.

In the steps, the root of the Pt100 chip is coated with heat-conducting insulating glue for reinforcement, and then the Pt100 chip is placed into an oven to be dried for more than half an hour or naturally dried for more than 12 hours at the temperature of 70 +/-10 ℃.

The maximum allowable excitation current of the product is 5mA, the temperature rise generated by the maximum allowable excitation current is not more than 0.3 ℃, the insulation grade is F grade, the temperature measurement range is-40 to 200 ℃, the thermal response time is not more than 6 seconds, the voltage resistance is 1000V, the service life is more than 12 months, and the product can be continuously used for a period of time when the current is overlarge. Although the present invention has been described with reference to the preferred embodiments, it should be understood that various changes and modifications can be made by those skilled in the art without departing from the spirit and scope of the invention.

Claims

1. A practical platinum thermal resistance sensor is characterized in that: the sensor main part is chip (1), chip (1) overcoat has shell (3), chip (1) one end sets up at shell (3) the innermost, and pin (4) are connected to the other end, do the crimping and handle, pin (4) outer joint silvered wire (2), the partly uncovered silver thick liquid of an angular length 1-1.2mm, wide 0.8-1mm of chip (1) one end, the rest covers the silver thick liquid, and from the partly outer joint pin of uncovered silver thick liquid, from covering another pin of partly outer joint of silver thick liquid, two pins link to each other with the chip on one side, the heat-conducting glue is scribbled to the chip other end, the heat-conducting glue is scribbled into the semi-circle that the radius is 0.5-1 mm.

2. A platinum thermistor according to claim 1, characterized in that: the chip (1) is a Pt100 chip.

3. A platinum thermistor according to claim 1, characterized in that: the length of the pin (4) is 2-5 mm.