JPH0441929Y2 - - Google Patents

Description

[Detailed description of the invention] <Industrial application field> This invention is an improved type that can be used in factories, laboratories, laboratories, etc. to remove unpleasant odors, toxic gases, etc. by suction and improve the environment. Regarding a noiseless deodorizing device.

<Conventional technology> Conventional deodorizing equipment sucks unpurified air from outside of an adsorption filter material such as activated carbon held in a cylindrical shape.
Some systems use an axial fan to generate airflow from the central cavity, pass through the muffler, and then exhaust the air back into the atmosphere, deodorizing and purifying the air as it passes through an adsorption filter medium. 62-29057).

<Problem to be solved by the invention> However, in the above conventional example, primary air is taken in from the outer periphery of the adsorption filter medium held in a cylindrical shape and collected into the central cavity of the cylindrical adsorption filter medium, so the internal pressure of the cavity increases. If this is released into the atmosphere as it is, a strong impact sound will be generated due to the significant pressure difference with the outside pressure. Therefore, in order to absorb this impact sound, mufflers are installed to muffle the sound, but since the compressed purified air is released instantaneously through a narrow passage, it is not possible to achieve a sufficient muffling effect. Unacceptably, the installation of a silencer increases the size of the entire device, and moreover, several types of silencers are required depending on the size of the deodorizing device, making parts management complicated and reducing the number of assembly steps. There were drawbacks such as increased costs due to the increase in number of units.

The present invention aims to address the drawbacks of the above-mentioned conventional examples and to provide an improved deodorizing device that can exhibit a sufficient noise reduction effect without the need for a special muffler.

<Means for solving the problem> A suction type axial flow fan is installed in the upper part of the central cavity of an adsorption filter medium held in a cylindrical shape by a ventilated inner and outer cylinder, and a conical fan is installed at the lower end of the cavity. A buffer plate is provided to exhaust primary air outward from the central cavity of the cylindrical adsorption filter medium.

<Function> Untreated outside air is taken in by an axial flow fan on a central cavity formed by a cylinder, passed from inside the cavity to the outside through an adsorption filter medium, and then released into the outside air. The internal pressure of the cavity is distributed radially toward the adsorption filter media around it, so the wind pressure at the point where it exits the filter media is attenuated, reducing the pressure difference with the outside air and eliminating impact noise. The conical surface of the buffer plate disperses the airflow to the surrounding area, mitigating the impact noise caused by the direct impact of the airflow, and providing a significant sound damping effect.

<Example> Hereinafter, the present invention will be described in detail with reference to an example shown in the drawings.
and a cylindrical outer cylinder 2, which also has air permeability, are arranged concentrically with a constant interval between them, and the upper and lower ends of the opposing gap between the inner cylinder 3 and the outer cylinder 2 are connected to the top plate 13 and the bottom plate, respectively. 6, the top plate 13 and the bottom plate 6 are each provided with an inlet 12 for introducing an adsorption filter medium, that is, activated carbon 4, and an outlet 8 for taking out the activated carbon. The upper end of the mantle 1 is fixedly suspended from the peripheral edge of the top plate 13 with a certain gap, and an annular exhaust port 7 is formed between the lower end of the mantle 1 and the lower part of the outer cylinder 2. An electric motor 1 is inserted into the central opening 14 of the top plate 13 in the upper part of the cavity 5 formed by the inner cylinder 3.
A wind tunnel 11 equipped with an axial fan 9 driven at zero is set up closely, and the suction port 15 of the wind tunnel 11 is
In addition, a conical buffer plate 16 is installed at the lower end of the cavity 5, that is, at the top of the bottom plate 6, to reduce the impact of the airflow. Become.

Incidentally, the slope of the conical surface of the buffer plate 16 is appropriately determined depending on the speed and flow rate of the airflow, and although the illustrated example shows a case where the buffer plate is configured separately, the bottom plate 6
This does not preclude the fact that it has a conical surface formed on it.
The device of the present invention can be made portable by attaching casters to it.

Furthermore, in the above structure, the inner cylinder 3 has air permeability,
The outer cylinder 2 may be made of a synthetic resin molded product or a mesh material, or any porous material that can hold the activated carbon, and the activated carbon 4 is inserted into the gap between the inner cylinder and the outer cylinder at the top. Wind tunnel 1 from mouth 12
It is used by inserting it at a height up to the side part of 1. Next, a series of operations of the deodorizing device according to the above configuration will be described.
Connect the duct 17 to the suction port 15 of the motor 1.
0 and rotates the axial fan 9 in the direction shown by the arrow, air is taken into the cavity 5, and forced ventilation is carried out from inside the cavity to the outside through the inner tube 3, adsorption filter layer 4, and outer tube 2. The air is discharged from the exhaust port 7 at the lower edge of the mantle 1.

Here, the jet flow blown at high speed by the axial fan 9 first collides with the conical surface of the buffer plate 16 provided at the part facing the axial fan 9, and is radially distributed toward the circumference by the inclined surface. It is dispersed and efficiently released from the cavity to the outside through the adsorption filter layer while mitigating the impact effect.

Then, when the air is dispersed radially from the central cavity through the adsorption filter layer and released to the outside, the internal pressure decreases, and the differential pressure becomes significantly smaller at the part in contact with the outside air, reducing impact noise.

<Effects of the invention> Since the present invention is configured as described above, there is no need to install a separate muffler, and the exhaust is radially diffused from the central cavity, reducing the impact pressure at the contact area with the outside air. , the noise is significantly reduced and it can be used comfortably.

Further, since the straight flow from the axial fan is received by the inclined surface of the buffer plate, the impact force is relaxed and the noise caused by the impact is absorbed.

Since it does not require the installation of a silencer, it can be installed in a smaller size, is easier to assemble, and can be manufactured at a lower cost, making it a highly practical idea with many excellent effects.

[Brief explanation of the drawing]

FIG. 1 is a central vertical sectional side view of the present device. 1...Outer jacket, 2...Outer cylinder, 3...Inner cylinder, 4...
Adsorption filter medium, 5... Cavity, 6... Bottom plate, 7... Exhaust port, 9... Axial flow fan, 11... Wind tunnel, 13...
Top plate, 16...buffer board.

Claims (1)

[Scope of utility model registration request] Breathable inner cylinder 3 and outer cylinder 2, and top plate 13
and a bottom plate 6, an inlet 12 is provided at a predetermined position at the upper end, and an outlet 8 is provided at a predetermined position at the lower end.The adsorption filter material 4 is filled into a cylindrical gap formed by the inner cylinder 3. A wind tunnel 11 of a suction type axial flow fan 9 to which an air feeding duct is connected while maintaining airtightness with the inner cylinder 3 is fixed in the upper part of the hollow cavity 5, and a wind tunnel 11 is fixed on the bottom plate 6 at the lower end of the cavity 5. By attaching a conical buffer plate 16 to the outer periphery of the outer cylinder 2 and airtightly fixing the outer casing 1 to the periphery of the top plate 13 while maintaining a certain air gap around the outer periphery of the outer casing 2, the outer periphery of the outer casing 2 and the outer casing are 1. A noiseless deodorizing device having an annular exhaust port 7 formed between the lower end edge of the holder 1.