Development and application of infrared sensor automatic flushing and lighting combined delay controller

November 27, 2021

At present, the toilet flushing switch of the hospital is mostly equipped with a water tank type and a manual valve type, and the lighting adopts a manual switch. Both lighting and flushing require manual switches, which are inconvenient and unsanitary to use, and are not conducive to water and electricity saving. More importantly, most of the personnel entering the hospital bathroom are patients, accompanying people and hospital staff. The switch of the bathroom, so that the pathogenic bacteria contact and spread through this way, leading to cross-infection, in this special crowd, special occasions, special requirements, inspired us to develop a combination of infrared sensing automatic flushing and lighting delay Controller.

1Functional characteristics The controller consists of infrared sensor, amplifier, delay drive relay, solenoid valve/lighting and photoelectric controller. When someone enters the toilet, the infrared probe senses the body radiation, triggers the signal, and drives the relay to work when it is amplified. The solenoid valve works for water supply, and the night light is on. When the person leaves the bathroom, the human body sensing signal is interrupted, the delay device reaches the end of the set time, the circuit is disconnected, and the solenoid valve is closed to stop the water supply and illumination. It has the following characteristics: (1) When the night or the light is dark, someone enters the bathroom controller to automatically switch the lighting without manual touch operation; (2) Someone enters the bathroom and uses different toilets to automatically delay the flushing; (3) Flushing and The length of lighting can be set by itself; (4) The exhaust fan can be installed in the bathroom to work synchronously with the flushing; (5) It is easy to manufacture, low in cost and wide in adaptability.

2Usage effect 21 Before using the device, we carried out sampling monitoring of the faucet, toilet hand button and lighting manual switch of the bathroom in our hospital (10 samples each), respectively for bacteria and hepatitis B surface antigen (HI- Detection of sAg). Results: The positive rate of HBsAg was 47.32%, the bacterial contamination rate was 100%, and it exceeded the standard requirements. Among the detected bacteria, common pathogens include: E. coli accounted for 76.70%, Salmonella accounted for 4.60%, Staphylococcus aureus accounted for 86.71%, Staphylococcus epidermidis accounted for 53.60%, and Pseudomonas aeruginosa accounted for 36.78 %Wait. After using the device, cross-infection is eliminated because the person entering the bathroom avoids touching the various switches and buttons in the bathroom.

2.2 Before using the device, after a rough calculation, the annual water consumption of the hospital bathroom was 175,200 m3, and the water fee was 192,720 yuan; the annual electricity consumption was 8760 kw, and the combined electricity cost was 3,504 yuan. After use, the annual water consumption of the hospital bathroom is 48,545 m3, and the water fee is 53 399.5 yuan; the annual electricity consumption is 2372.5kw*h, and the electricity cost is 949 yuan. Therefore, the annual water consumption can be 126,320 yuan; the annual electricity consumption can be 6387.5kw*h, and the combined electricity cost is 2550.50 yuan. A total of annual savings for hospitals 141 2.3 This device has obvious advantages compared with similar products. At present, although there is a single door control ventilation flushing, voice-activated lighting, and manual urinal switch, the door control can only automatically control the switch if the door is moved. If the door does not move, the meaning is lost; if the sound is controlled, the switch will be triggered. Interfering with severe rats often does not achieve real savings; manual cross-infection.

3 Discussion Hospital infection has become a serious problem in the face of the majority of medical workers in recent years. In China, about 50 million patients are hospitalized every year, and about 5 million patients have hospital infections, resulting in additional medical expenses of 10 to 15 billion yuan. Renminbi (infection rate is calculated at 10%). There was a 100% prevalence rate of monitoring medical staff who did not wash their hands after touching patients or dirt. The manual switch added the opportunity of cross-infection between the accompanying person and the staff, and wasted water and electricity. Infrared sensing automatic flushing and lighting delay controller is used in hospital bathroom. After more than 4 years of observation, the device has high sensitivity, long service life, safety and reliability.

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