Locking tooth-type insulation temperature measuring device used for end cap of motor

Abstract

A locking tooth-type insulation temperature measuring device used for an end cap of a motor mainly comprises an insulation temperature measuring device fixed in an end cap hole of the motor which is composed of an insulation support member and a temperature measuring member which is arranged in the insulation support member. According to the locking tooth-type insulation temperature measuring device used for the end cap of the motor, defects that the temperature measuring member and the end cap of the motor are not fixed fixedly, and the temperature measuring member is led to not work normally are overcome, and the locking tooth-type insulation temperature measuring device used for the end cap of the motor is suitable for being auxiliary products of all kinds of motor bearings, and in particular to being motor bearing insulation end cap products which need to strictly control shaft current.

Description

technical field [0001] The invention relates to a locking tooth type insulating temperature measuring device for a motor end cover. Background technique [0002] The existing method of installing temperature measuring elements for motor bearings generally uses elements such as thermocouples or thermal resistors as temperature measuring elements. The screw is used to install the thermocouple or thermal resistance sensor, and the end face of the sensor is in contact with the outer ring of the bearing. The connection wire is led into the junction box and connected to the special instrument. The disadvantage of this installation method is that the shaft current is easy to flow when the motor is working. A current loop is formed through the temperature measuring element, resulting in the current corrosion of the bearing by the shaft current; in order to prevent the current corrosion of the bearing by the motor shaft current, another installation method is to fix the temperature m...

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Problems solved by technology

[0002] The existing method of installing temperature measuring elements for motor bearings generally uses elements such as thermocouples or thermal resistors as temperature measuring elements. The screw is used to install the thermocouple or thermal resistance sensor, and the end face of the sensor is in contact with the outer ring of the bearing. The connection wire is led into the junction box and connected to the special instrument. The disadvantage of this installation method is that the shaft current is easy to flow when the motor is working. A current loop is formed through the temperature measuring element, resulting in the current corrosion of the bearing by the shaft current; in order to prevent the current corrosion of the bearing by the motor shaft current, another installation method is to fix the temperature measuring element on the end through the insulating support In the installation hole of the cover, the installation hole does not process threads, it is a finely processed light hole, and the insulating support with a cylindrical shape and the light hole carry out interference fit to solve the fixing problem; temperature measuring elements such as thermocouples or thermal resistances pass through threads Connected to the insulating support; the insulating support prevents the shaft current from passing through the temperature measuring element to form a current loop when the motor is working, causing the shaft current to galvanically corrode the bearing; however, the insulating support is pushed by the spring at the head of the temperature measuring element Function, its fixation is not very firm, it is easy to loosen, which makes the sensor of the temperature measuring element invalid, resulting in the failure of temperature measurement or large measurement error; the main reason for the loosening of the insulating support is: ⑴Since the insulating support is made of high Made of insulating grade composite material, the surface of the composite material is extremely smooth, and the friction coefficient is very small. Even if it is interference fit with the mounting hole on the end cover, it will be difficult to overcome the spring on the head of the temperature measuring element due to the generated friction force is too small Thrust; (2) Because the tolerance of the mounting hole of the insulating support is small and the precision is high, it is usually achieved by reaming. It is difficult to guarantee the dimensional accuracy of ordinary processing. If the size is slightly out of tolerance, it will cause loose fit and occur. The temperature measuring element is loose

[0003] Due to the loose fixation of the insulating support for supporting the temperature measuring element and the installation hole and the need for reaming processing requirements, the product pass rate of the motor bearing end cover only reached 90%, resulting in large direct economic losses and Waste of raw materials, but also increase the cost of motor users

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