A relay that acts when the outside temperature reaches a given value. The product is a contact-contact inductive sealed temperature relay, which has the characteristics of small size, light weight, high temperature control precision, and the versatility. It is the most widely used product for aerospace, surveillance camera equipment, motors, electrical equipment and other industries for temperature control and overheat protection.
How the temperature relay worksThe two metals or alloys with widely different thermal expansion coefficients are firmly combined with each other to form a disc-shaped bimetal. When the temperature rises to a certain value, the bimetal will expand due to the expansion of the underlying metal, and the upper metal will expand and expand. Small and produces upward bending force. When bent to a certain extent, it can drive the electrical contacts to realize the function of turning on or off the load circuit. When the temperature is reduced to a certain value, the bimetal gradually recovers and returns to a certain degree. Drive the electrical contacts to achieve the function of disconnecting or turning on the load circuit. The working principle of the disc-shaped bimetal is shown in Figure 1. The initial state is 1 (at room temperature), and after heating (or cold), it jumps to state 2, resulting in displacement 3.
The temperature relay for aviation is basically the same as the civil temperature relay. However, due to the harsh working environment and complicated equipment structure, the aviation industry has extremely extreme materials, processes, tests and service life. Strict requirements, such as the production of products need to pass a series of environmental protection (wet heat, mold, smoke), vibration (sinusoidal, random), acceleration, impact, low air, etc., the life expectancy of the product is the same machine Life expectancy, process requires stable treatment for a long time, etc.
Structure and working principle of bimetal temperature relayThe bimetal in the bimetal temperature relay is formed by laminating two metals having different coefficients of thermal expansion by calendering. When the bimetal is heated, it will be bent and deformed due to different elongation. This deformation can thus be utilized to turn the contact switch on or off.
Bimetals are commonly made of nickel-iron alloy and brass, and require good flexibility to ensure temperature control accuracy and reusability.
The deformation amount and joint pressure of the bimetal are determined by the following formula (see figure):
Bimetal parameter map
The figure is a schematic diagram of the structure of a bimetal temperature relay. Figure (a) shows a packaged bimetal temperature relay consisting of a bimetal, a movable contact, a fixed contact, a glass envelope, and a lead. When the temperature felt by the bimetal reaches a predetermined control temperature, it deforms, thereby disconnecting the movable contact from the fixed contact and functioning as a temperature-controlled switch. The temperature relay shown in Figure (b) consists of a bimetal, a push rod, a contact switch, and a casing. Usually, the contact of the contact switch is in a normally closed state. When the temperature felt by the bimetal reaches a predetermined control temperature, the bimetal is deformed under the action of temperature, and the push rod is moved downward to make the contact switch The contacts are disconnected and function as a temperature-controlled switch.
Bimetal temperature relay structure diagram
Temperature relays, also known as temperature controllers, are mainly used in applications where automatic temperature control is required. They are widely used in household appliances such as heaters, microwave ovens, electric water heaters, water dispensers, dishwashers, disinfection cabinets and dryers. application. In addition to being used for automatic temperature control, it can also be used as a thermal overload protection device and is used in industrial electronics.
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