Home appliance relay is an electrical switch device commonly used in household appliances to control the on/off of current. Its function is to control a larger current with a smaller current, so that the circuit in the household appliance can work normally according to the set way. A relay consists of a coil, an armature (movable component), and contacts. When the coil passes current, it generates a magnetic field that drives the movement of the armature. This movement opens or closes contacts, allowing or interrupting the flow of current.
Types of relays used in household appliances
There are several types of relays, but the commonly used relays in household appliances mainly include electromagnetic relays and solid-state relays.
- Electromagnetic relays: Their working principle is to physically switch between switches and coils. Usually, EMR is used for situations where the appliances or equipment used are slightly old or have high power consumption.
- Solid state relays are completely electronic devices without moving parts. SSR is more reliable and faster than electromagnetic relays, and is widely used in today's household appliances such as dishwashers, refrigerators, and air conditioners.
The function of relays in household appliances
Relay function in a washing machine
The general design of a washing machine is very complicated and includes many components, such as motors, water pumps, heaters, and speed governors that must be precisely controlled. These commands are transmitted between different components through relays, which ensure the right sequence in which the washing, rinse, and dehydration should be performed by the washer.
- Relay is applicable to motor control at advanced stages of the operation; say washing and dehydration stages are examples of such. Suppose that the stage is for a rinse in a washer: at this stage, a relay will switch the course so as to make sure correct directions rotate in the right speed ratio.
- The water pump control: relays also undertake the responsibility for controlling the operation of a water pump. If the water level reaches a set value, it will shut off the inlet valve and start the drainage pump so as to guarantee that the water in the washing machine is discharged in time.
- Heating element control: In the process of hot water heating, the heating element is controlled by a relay in the washing machine. During the process of heating, if the water must be heated, the relay will signal the heating element to turn on with accuracy and in time. Once the desired temperature is reached, the relay will cut off the current to avoid overheating.
Relay function in refrigerator
In short, the main role of the refrigerator is to keep the food cold, and relays also play an important role in that. Relays mainly feature in the operation regulation of the compressor inside a refrigerator. The temperature control requirements of a refrigerator automatically start and stop the compressor to keep the inside temperature within a certain range.
- Compressor control: Usually, the refrigerator compressor is driven on/off by a relay. The relay will make a decision to turn on the compressor based on the feedback signal of the thermostat. If the temperature is too high, the relay will start working to lower the temperature. Once the temperature reaches an ideal value, the relay will stop the compressor in order to save energy.
- Energy Efficiency and Temperature Control: Relays ensure that the compressor works not only efficiently but also not always to prevent wasting energy. By intelligent control, the relay makes the refrigerator shut down the compressor immediately after reaching the set temperature, thus prolonging equipment service life.
Relay function in air conditioning
Nowadays, air conditioners are very common in every home and office; thus, particularly in summer, it is used quite frequently. The main use of relays in an air conditioner is to regulate the operation of compressors, fans, and temperature control sensors to ensure the air conditioner can quickly and efficiently adjust the indoor temperature.
- Compressor control: The compressor in the air conditioner is one of the most energy consuming components, and the relay ensures that it only starts when the temperature is too high and stops working when the temperature reaches the standard. The relay controls the start stop cycle of the air conditioner to avoid unnecessary energy consumption.
- Fan control: The cooling process of the air conditioner is controlled by the relay to work in a cooling fan. The temperature surpasses the value set while the fan turns on for facilitating the air flow in accelerating the heat exchange process. Hence, the relay can guarantee the fan works in situations it is required to work and prevents the useless operation of an air conditioner.
- Temperature control sensor: Modern air conditioners are equipped with intelligent temperature control systems that accurately regulate indoor temperature through relay and sensor coordination. The relay determines whether to start or stop the cooling or heating system based on the signal returned by the sensor.
Relay function in other household appliances
Relays are also playing a very vital role in many other appliances used in households, like dishwashers, electric ovens, water heaters, etc.
- Dishwasher: Relays help in managing several functions of water flow, heating hot water, washing, and drainage. They ensure each cleaning cycle can be completed precisely for efficient cleaning results.
- Electrical Oven: The relay, on receiving control signals in a programmed electronic oven, initiates contact with the heating element ON and OFF for food baked at the right temperature; this contact has similar parallel circuits that, likewise regulate a fan, operating continuously or intermittently with a view to evenly spreading out heat.
- Water Heater: Relays control the on/off of heating elements so that power automatically goes off at an attained value of the water temperature. This saves energy as well as avoids the overheating of water.
Why are relays very crucial in household appliances?
1. Safety
The major role of relays in household appliances pertains to safety. In a washing machine, for example, it will guarantee that the motor only operates when the drum is locked to avoid accidents. It regulates the refrigerator's compressor switch to avoid overheating and protect the equipment from being damaged to cause fire.
2. Energy efficiency
Relays help the appliances utilize electrical energy to its fullest by closing down components when not in use. For example, the relay will switch off the compressor when the refrigerator reaches a certain temperature, which means it saves energy and cuts electricity bills.
3. Extends life of appliances
Relays can help in preventing excessive use of any part and hence control the usage of any electrical component. In the case of air conditioning, it will stop the compressor from operating constantly, allowing extension in the service life of appliances within a house, prevention from excessive wearing and tearing of equipment for long-term, normal working of home-based appliances.
How to choose the appropriate home appliance relay
Nominal voltage and current
According to the different requirements of equipment, choose the corresponding relays. For instance, for a washing machine that requires multi-motor operation, it is suggested to select a high-current supported relay; for a refrigerator, the appropriate model of relay should be selected for the compressor start-up load.
Work environment:
According to the usage environment of the device, choose a type of enclosure with protective functions to prevent external factors (such as humidity, dust, etc.) from affecting the operation of the relay and ensure its stable performance.
Contact type and response speed
Different application scenarios have different requirements for contact type (normally open, normally closed, or switching) and response speed. It is necessary to select suitable relays according to actual needs to meet equipment performance requirements.
Cost and reliability
On the premise of meeting performance requirements, considering the cost and long-term reliability of relays, choose products with high cost-effectiveness.
If you need to further understand the selection of relays, you can visit our product category or directly contact our technical team, and we will provide you with professional relay solutions.
