CN104707439A - PM2.5 (Particulate Matter 2.5) filtration device and filtration method of automobile air conditioner filter - Google Patents

Abstract

The invention discloses a PM2.5 particle filtering device and filtering method for an automobile air conditioning filter. The device includes an automobile air conditioning filter, a sound wave reunion chamber and a sound wave generating unit; The outlet end is connected to the inlet end of the air conditioning filter; the sound wave generation unit is symmetrically arranged on both sides of the sound wave reunion chamber, and the sound wave generation unit is composed of a speaker, a sound source, a power amplifier and a signal generator. The invention utilizes the agglomeration effect of low-frequency sound waves to pretreat PM2.5 particles in dusty air, promotes the growth of particle size, improves the filtration efficiency of PM2.5 particles in automobile air conditioner filters, and reduces the concentration of PM2.5 inside automobiles , optimizing the comfort and safety of the ride. The invention does not need to change the structure of the original automobile air conditioner, has the advantages of low reconstruction cost, high efficiency, long service life, etc., and can be widely used in various automobile air conditioners.

Description

A kind of PM2.5 particulate filtering device and filtering method of automobile air conditioner filter

technical field

The invention relates to the field of air purification, in particular to a device and method for filtering PM2.5 particles of an automobile air conditioning filter.

Background technique

The cabin air filter is an important part of the car air conditioning system. Its function is to filter the impurities and dust contained in the air outside the car and protect the health of the people inside the car. Cabin filters on the market can be divided into ordinary cabin filters and activated carbon cabin filters. The working efficiency of activated carbon cabin filters is better than that of ordinary cabin filters, but these two types of cabin filters The filtration efficiency of the filter for fine particles below PM2.5 still needs to be improved. Long-term exposure to PM2.5 fine particles will significantly increase the incidence of human cardiovascular disease, respiratory disease and lung cancer.

In response to this problem, patents CN103961938A and CN203852938U have announced a multi-layer structure antibacterial automotive cabin filter capable of filtering PM2. Problems such as PM2.5, bacteria, organic matter and odor. Patent CN104056509A discloses a PM2.5 particle-proof vehicle air-conditioning filter and its manufacturing process, including a frame and a filter element located in the frame. Filtration defects caused by easy deformation. CN203829824U discloses a car air-conditioning filter element with three layers of membranes. The first layer of flat membrane is used to filter dust and sterilize, the second layer of pleated membrane is used to filter PM2.5, and the third layer of membrane is used to remove polluting gas. However, the above patents all require modification of the filter element of the air conditioning filter, and the flow resistance of the modified filter will increase, which will have a negative impact on the cooling (heating) efficiency of the air conditioning system.

Contents of the invention

In order to solve the problem of low filtration efficiency of PM2.5 particles in the existing automotive air conditioner filter, the present invention provides a device and method for improving the working efficiency of the automotive air conditioner filter by utilizing the sound wave agglomeration effect.

The present invention adopts the following technical solutions for solving the problems of the technologies described above:

A PM2.5 particle filter device for automotive air conditioning filters, the device includes a sound wave reunion chamber 6 and several sound wave generating units, the sound wave reunion chamber 6 is a chamber with two ends open, one end is directly connected to atmospheric air, and the other One end is connected with the inlet section of the air conditioner filter; the sound wave sounding unit is arranged on the side wall of the sound wave agglomeration chamber 6, and communicates with the interior of the sound wave agglomeration chamber 6, and the sound waves it sends make the particles of large and small sizes adhere to each other .

Further, the above-mentioned sound wave generating unit includes a signal generator 2, a power amplifier 3, a sound source 4 and a speaker 5 connected in sequence, and the speaker 5 is connected to the side wall of the sound wave reunion chamber 6 and communicates with the inside of the sound wave reunion chamber 6.

Furthermore, the above-mentioned sound wave reunion chamber 6 is a channel with a rectangular cross section, and several sound wave generating units are symmetrically arranged on the side wall of the sound wave reunion chamber 6, wherein the sound wave generating units on the same side share the signal generator 2 and the power amplifier 3.

Furthermore, the above-mentioned horn is a horn-shaped telescopic diffuser tube, the opening of the end connected to the sound wave reunion chamber 6 is large, and the opening of the end connected with the sound source 4 is small, and the length of the telescopic diffuser tube is adjusted to ensure that the sound source 4 and the sound wave Distance between reunion rooms 6.

As a preference, the above-mentioned signal generator 2 and power amplifier 3 are used to adjust the frequency and sound pressure level of the sound wave; the frequency of the sound source is between 1500-2000 Hz, and the sound pressure level is between 100-150 dB.

As a preference, the inner surface of the side wall of the sound wave gathering chamber 6 is covered with sound-absorbing sponge.

A method for filtering PM2.5 particles of an automobile air conditioner filter, the method comprising the steps of:

Step 1, introduce dusty air into the sonic agglomeration chamber, promote the agglomeration of PM2.5 particles through the action of sound waves, and increase the particle size;

Step 2, according to the size of the air flow and the quality of the intake air, select the number, frequency and amplitude of the operating sound sources.

Step 3: When the agglomerated PM2.5 particles pass through the air conditioner filter element, they are captured by the filter element, and the PM2.5 concentration in the air decreases.

Compared with the prior art, the present invention adopts the above technical scheme and has the following technical effects:

The invention aims at the problem that it is difficult for an automobile air conditioner filter to capture PM2.5 particles, and uses sound waves to pretreat the dusty air before entering the air conditioner filter. After the action of the sound wave, the PM2.5 particles are agglomerated, the particle size becomes larger, and it is easier to be collected by the cabin filter. The invention improves the filtering efficiency of PM2.5 particles of the automobile air conditioner filter, reduces the concentration of PM2.5 inside the automobile, and optimizes the comfort and safety of driving.

The PM2.5 particle filter device of the automobile air conditioning filter provided by the present invention only needs to install an acoustic wave reunion chamber on the filter, and the relative displacement between the large-sized particles and the small-sized particles is caused by the sound waves, and the collision frequency is enhanced, and the Van der Waals force Under the action of the small-sized particles, it is easy to adhere to the surface of the large-sized particles, so that the small particles "grow", and the particle size of the small-sized particles after the growth becomes larger, and the PM2. , are more likely to be captured by the car air conditioner filter.

The sound source frequency and sound pressure level of the sound wave generation unit can be adjusted according to the air volume and quality, and the number of sound wave units activated also changes accordingly, which is scientific and environmentally friendly; the sound insulation cotton in the sound wave reunion room plays the role of isolating noise, and it is easier to use comfortable.

The PM2.5 particle filter device of the automobile air conditioner filter does not need to encrypt the air conditioner filter element, which reduces the air inlet pressure loss and effectively prevents the fine particles on the surface of the air conditioner filter screen from clogging; The system transformation does not affect the working performance of the original air conditioner, and has the advantages of low transformation cost, high efficiency, and long service life.

Description of drawings

Fig. 1 is the structural representation of device of the present invention;

Figure 2 is a schematic diagram of the installation structure of the device of the present invention.

Detailed ways

The present invention provides a PM2.5 particle filtering device and filtering method for an automobile air-conditioning filter. In order to make the object, technical scheme and effect of the present invention clearer and clearer, the present invention is further described in detail with reference to the accompanying drawings and examples. It should be understood that the specific implementations described here are only used to explain the present invention, not to limit the present invention.

Below in conjunction with accompanying drawing, the technical scheme of invention is described in detail:

As shown in FIG. 1 , the device for improving the removal efficiency of PM2.5 particles in an automotive air conditioner filter by means of acoustic agglomeration includes an air conditioner filter 1 , an acoustic agglomeration chamber 6 and an acoustic wave generating unit. The inlet of the sound wave reunion chamber 6 is directly installed in the external environment, and the outlet is connected to the inlet of the filter. There are 6 symmetrically arranged sound wave generating units installed on both sides of the sound wave reunion room. The sound wave generating unit is composed of a speaker 5, a sound source 4, a power amplifier 3 and a signal generator 2. The sound wave can be adjusted by adjusting the signal generator 2 and the power amplifier 3. The frequency and voltage level of the car, the car power supply for the signal generator 2 and the power amplifier 3 to provide the power required for operation. After the action of sound waves, the PM2.5 particles in the air are agglomerated, the particle size increases, and are filtered out by the filter. The air filtered by PM2.5 enters the car air conditioning system for heating or cooling.

Below in conjunction with Fig. 2 illustrate a specific application example of the present invention improving PM2.5 particle removal efficiency of automobile air conditioning filter. A sound wave reunion chamber 6 is installed between the air damper 7 and the blower fan 8, and three symmetrical sound wave generating units are respectively installed on the left and right sides. The sound wave generating unit is composed of a speaker 5, a sound source 4, a power amplifier 3 and a signal generator 2. The operating quantity, frequency and pressure level of the sound source are adjusted according to the detected air flow and PM2.5 concentration, and the frequency of the sound source is adjusted The range is between 1500~2000Hz, and the adjustment range of sound pressure level is 100~150dB. The horn 5 is in the shape of a telescopic diffuser tube, and the length of the telescopic diffuser tube can be automatically adjusted to ensure that the distance between the sound source and the sound wave reunion chamber is 2 to 3 sound wave wavelengths. The wall of the sound wave reunion chamber is covered with 10mm thick sound-absorbing sponge, and the residence time of the air in the sound wave reunion chamber is 1~3s. The purified air releases heat to the surface of the evaporator 9. At an ambient temperature of 40°C, the temperature of the air flowing through the evaporator can drop to 20°C at most, and the cooled air is sent to the car; if the ambient temperature is very low (winter) , then start the warm air exchanger 10, and the low-temperature air is delivered to the car after absorbing heat on the surface of the warm air exchanger and heating up. The cooling medium in the automobile air conditioner circulates in the evaporator 9 , the compressor 14 , the collision valve 13 , the condenser 12 and the liquid storage drier 11 .

The operation results show that: when the air intake volume is 4200 liters/m3 and the PM2.5 concentration is 74 micrograms/m3, two sound sources are turned on, and the sound source frequency and sound pressure level can be selected as 1500Hz and 100dB. The device can filter 25% of PM2.5 particles; when the air intake volume is 5400 liters/m3 and the PM2.5 concentration is 200 μg/m3, four sound sources are turned on, and the frequency and sound pressure level of the sound source can be selected 1740Hz and 130dB, this set of devices can filter 47% of PM2.5 particles; when the air intake volume is 6000 liters/m3 and the PM2.5 concentration is 330 μg/m3, six sound sources are turned on, and the sound source The frequency and sound pressure level can be selected as 2000Hz and 150dB, and the set can filter 63% of PM2.5 particles.

It can be understood that those skilled in the art can make equivalent replacements or changes according to the technical solution of the present invention and its inventive concepts, and all these changes or replacements should belong to the protection scope of the appended claims of the present invention.

Claims (7)

1. an automobile air-conditioning filter PM2.5 particulate leaching device, it is characterized in that: this device comprises acoustic agglomeration room (6) and some acoustic wave generation unit, the chamber that described acoustic agglomeration room (6) is both ends open, one end is directly connected with atmospheric air, and the other end is connected with the entrance of air-conditioning filter cleaner; Described sound wave phonation unit is arranged on the sidewall of acoustic agglomeration room (6), and communicates with acoustic agglomeration room (6) inside, and its sound wave sent makes the particle of large and small size mutually adhere to.

2. a kind of automobile air-conditioning filter PM2.5 particulate leaching device according to claim 1, it is characterized in that: described sound wave phonation unit comprises the signal generator (2), power amplifier (3), sound source (4) and the loudspeaker (5) that connect successively, described loudspeaker (5) are connected on the sidewall of acoustic agglomeration room (6), and communicate with acoustic agglomeration room (6) inside.

3. a kind of automobile air-conditioning filter PM2.5 particulate leaching device according to claim 2, it is characterized in that: described acoustic agglomeration room (6) for cross section be the passage of rectangle, the sidewall symmetry of acoustic agglomeration room (6) arranges several acoustic wave generation unit, wherein, the acoustic wave generation unit being positioned at homonymy shares signal generator (2) and power amplifier (3).

4. a kind of automobile air-conditioning filter PM2.5 particulate leaching device according to claim 2, it is characterized in that: described loudspeaker are trumpet-shaped flexible anemostat, its one end open be connected with acoustic agglomeration room (6) is large, the one end open be connected with sound source (4) is little, by the adjustment of flexible diffusion tube lengths to ensure the distance between sound source (4) and acoustic agglomeration room (6).

5. a kind of automobile air-conditioning filter PM2.5 particulate leaching device according to claim 2, is characterized in that: described signal generator (2) and power amplifier (3) are for regulating sound wave frequency and sound pressure level; The frequency of sound source is between 1500 ~ 2000Hz, and sound pressure level is between 100 ~ 150dB.

6. according to any one automobile air-conditioning filter PM2.5 particulate leaching device described in claim 1 to 5, it is characterized in that: the inner surface of described acoustic agglomeration room (6) sidewall is coated with sound absorption sponge.

7. an automobile air-conditioning filter PM2.5 particulate leaching method, is characterized in that: the method comprises the steps:

Step 1, is incorporated into acoustic agglomeration room by dust laden air, promoted the reunion of PM2.5 particle by sound wave effect, increases grain diameter;

Step 2, according to the size of air mass flow and the quality of air inlet, selects the quantity of operation sound source, frequency and amplitude;

Step 3, the PM2.5 particle after reunion, through air-conditioning filter cleaner filter core, is caught by filter core, and in air, PM2.5 concentration declines.