Slice-type temperature sensor

Abstract

The invention belongs to the technical field of temperature sensors, and specifically relates to a slice-type temperature sensor. The sensor comprises bimetallic strip. The bimetallic strip is connected with two wires. The bimetallic strip is divided into a No.1 metal sheet and a No.2 metal sheet. The thermal expansion coefficient of the first metal sheet is larger than that of the second metal sheet. A third metal sheet is arranged on the side, away from the second metal sheet, of the first metal sheet, the thermal expansion coefficient of the third metal sheet is larger than that of the first metal sheet, a fourth metal sheet is arranged on the side, away from the first metal sheet, of the second metal sheet, and the thermal expansion coefficient of the fourth metal sheet is smaller thanthat of the second metal sheet. According to the temperature sensor, the metal sheet with the larger thermal expansion coefficient is additionally arranged at the tail end of the bimetallic strip, sothat the arc bending angle of the bimetallic strip is enlarged, the control range of the bimetallic strip is enlarged through the arc bending angle of the bimetallic strip, and then the application range of the temperature sensor is enlarged.

Description

technical field [0001] The invention belongs to the technical field of temperature sensors, in particular to a sheet-type temperature sensor. Background technique [0002] A temperature sensor is a sensor that senses temperature and converts it into a usable output signal. The temperature sensor is the core part of the temperature measuring instrument, and there are many varieties. According to the measurement method, it can be divided into two categories: contact type and non-contact type. According to the characteristics of sensor materials and electronic components, it can be divided into two types: thermal resistance and thermocouple. [0003] The thermal bimetal is a relatively simple self-control element for temperature control. It consists of two layers of metal with different coefficients of thermal expansion. The layer with a large expansion coefficient is called the active layer, and the layer with a small thermal expansion coefficient is called the passive laye...

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Problems solved by technology

[0004] There are also some technical solutions about bimetal temperature sensors in the prior art, such as a Chinese patent with application number 2015201476458, which discloses a bimetal temperature sensor, including a housing, a bottom plate, a first to a second Lead wire, bimetallic element and bushing, weld the moving contact on the bimetallic sheet, through the welding of the control contact, the contact pressure is highly stable; when the ambient temperature reaches the flipping temperature of the disc-shaped bimetallic element, the disc-shaped bimetallic element flips over Drive the first contact to separate from the second contact; when the temperature drops to the reset temperature, the dish-shaped bimetal element turns over in the opposite direction to realize the closure of the first contact and the second contact. This patent has better sealing and insulation Features, dustproof and waterproof, has a good application field, meets the quality requirements of the vacuum dipping process for transformers and motor enameled wire windings, but can only perform single closing and separation, and cannot continue to respond to continuous changes in temperature after closing , so that the use of bimetal temperature sensors is limited;

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