CROSS-REFERENCE TO RELATED APPLICATION

This patent application claims the benefit and priority of Chinese Patent Application No. 202010828661.9, filed on Aug. 18, 2020, the disclosure of which is incorporated by reference herein in its entirety as part of the present application.

TECHNICAL FIELD

The present disclosure relates to the technical field of air purification, and in particular, to a disinfecting device for a central air conditioner.

BACKGROUND ART

Dust in a central air-conditioning system can serve as media for viruses and bacteria to spread pathogens to rooms with people, causing epidemic of respiratory infectious diseases via airborne transmission. In addition, particulate matters in ventilation ducts, microbial aerosols produced by cooling towers and humidifiers, dust mites deposited on a surface of air filters, and the like are also very likely to spread in crowded office buildings, endangering the health of people.

Conventional indoor disinfection methods are performed by using disinfectant, ultraviolet lamps, air purifiers, and the like. In the disinfecting device for the central air conditioner, a plasma photocatalytic method using nanomaterials is often used. The principle is to dispose a nanomaterial of titanium dioxide (TiO2) on an electrode plate of the purification device to form a titanium dioxide film with a high specific surface area and high oxidability. Ultraviolet rays with a wavelength (350 to 400 nm) emitted when the plasma is discharged under a low temperature are used to generate active substances with high performance, and the active substances are combined with the hydroxyl radicals of the plasma, causing a composite catalytic oxidation effect. The device has a complex structure and a better function of removing large suspended particles in the air, but it cannot effectively extinguish the extremely tiny suspended particles with viruses in the air, for example, aerosols. In addition, the entire device is very complex and needs professional maintenance, and its functions of air purification and disinfection will also fade away with time.

Currently, common indoor disinfection devices are the ultraviolet lamps and the air purifiers. The ultraviolet lamps eliminate viruses by using ultraviolet rays emitted by mercury lamps. The ultraviolet rays emitted by mercury lamps contain a larger amount of power, and if no protective measures are taken, great harms are likely to be caused to the human body. In addition, the ultraviolet lamps will also generate ozone, causing secondary pollution. Therefore, the ultraviolet lamps are often used at night with no humans around, and cannot work uninterruptedly around the clock. Currently, purification technologies using plasmas and powerful filters are usually applied to the air purifiers with disinfection functions on the market. This method is only suitable for a condition with large suspended particles in the air, and the purification efficiency is low. In large crowded offices, air purification and disinfection effects are poor, and therefore, the method is not suitable for the central air conditioner.

An effective disinfection device applicable to the central air conditioner urgently needs to be provided.

SUMMARY

The present disclosure is intended to provide a disinfecting device for a central air conditioner, to effectively disinfect the central air conditioner.

To implement the above objectives, the present disclosure provides the following solutions:

A disinfecting device for a central air conditioner is provided, including an ultraviolet laser, two reflectors, and an air duct cavity;

the air duct cavity is provided in an air supply duct of the central air conditioner;

the ultraviolet laser is provided outside the air duct cavity, and the two reflectors are respectively provided on an upper wall and a lower wall inside the air duct cavity; and

the ultraviolet laser is configured to emit ultraviolet rays with an incident angle of (3, and the ultraviolet rays are emitted to the reflector on the lower wall inside the air duct cavity through an ultraviolet ray inlet provided on the air duct cavity, are reflected by the two reflectors for multiple times to disinfect airflow flowing through the air duct cavity, and are emitted out through an ultraviolet ray outlet provided on the air duct cavity.

Optionally, the disinfecting device further includes an ultraviolet ray absorber, the ultraviolet ray absorber is provided at the ultraviolet ray outlet, and the ultraviolet ray absorber is configured to convert into thermal power the ultraviolet rays emitted from the ultraviolet ray outlet, and release the thermal power.

Optionally, a water cooling mechanism and/or an air cooling mechanism are/is provided in the ultraviolet ray absorber.

Optionally, a concave mirror is also provided in the ultraviolet ray absorber, and the concave mirror is configured to disperse the ultraviolet rays emitted from the ultraviolet ray outlet.

Optionally, the disinfecting device also includes two reflector-specific cooling fins; and

the two reflector-specific cooling fins are respectively provided on the upper wall and the lower wall inside the air duct cavity, and the two reflectors are respectively provided on the two reflector-specific cooling fins.

Optionally, an optical component is provided in the ultraviolet laser, and the optical component is configured to shape the ultraviolet rays emitted by the ultraviolet laser.

Optionally, the incident angle β of the ultraviolet rays can be adjusted, and the incident angle β of the ultraviolet rays is adjusted to adjust the number of reflections of the ultraviolet rays between the two reflectors.

Based on specific embodiments provided in the present disclosure, the present disclosure discloses the following technical effects:

The present disclosure discloses the disinfecting device for the central air conditioner, to use the high-powered ultraviolet rays to efficiently and rapidly eliminate viruses, and use two sets of parallel reflectors to reflect and overlap light curtains of the high-powered ultraviolet rays back and forth. In this way, small-sized aerosols with viruses can be eliminated, and no secondary pollutants such as ozone are produced in a process of purifying and disinfecting the air by the ultraviolet rays. The entire device has a simple structure and can be used in the central air conditioner with the existing architecture. The entire device only needs to be provided in an air supply duct of the central air conditioner.

In the present disclosure, the incident angle of the ultraviolet rays is also adjusted, to increase the number of reflections for efficient disinfection.

