JPH1089736A - Ventilating fan and driving method of the same - Google Patents

Abstract

PROBLEM TO BE SOLVED: To permit the intake of clean air for a long period of time without cleaning or replacing an air filter upon the ventilation of a building and the like. SOLUTION: In a ventilating fan, equipped with at least a propeller fan 4 and an air filter 11 in a suction air passage equipped with an air inlet port and air outlet port, the air filter 11 is an inertia separation type dust collecting filter and equipped with a dust removing passage 10, provided with an opening, equipped below the dust collecting filter 11, and two openings at the side of the air inlet port, while a non-return valve 13, precluding the inflow of air from the opening at the side of the air inlet port, is provided in the dust removing passage.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION The present invention relates to a ventilation fan for a building, a car interior, a cabin of a ship, and a cargo compartment.

[0002]

2. Description of the Related Art Conventionally, a ventilation blower having a structure shown in FIG. 3 has been generally used. A hole (2) is drilled in the wall (1) and passed through a pipe sleeve (3) with a propeller fan (4) therein. Most of the dirt on the outside air (5) is removed by the air filter (6), and clean gas is sent into the room. The air supply (7) passes through the intake passage (8). In this way, a ventilation blower (9) is formed. As a specific example of the conventional ventilation blower, “Mitsubishi Ventilation Blower New Product N” created in March 1996 by Nakatsugawa Seisakusho, Ltd. (1-3 Komabacho, Nakatsugawa City, Gifu Prefecture)
EWS No. 5 "V-08PQUK. V-08PQUK uses a polypropylene non-woven fabric filter as an air filter.

[0003]

In a conventional ventilated blower, dust and dirt contained in the outside air are trapped and held by the air filter. Therefore, in a ventilated blower used for a certain period of time, the dust trapped and held by an air filter is always used. And the outside air is introduced into the room through the dust and dust. That is, in the conventional ventilation blower, the operation of purifying the outside air with the air filter and the operation of contaminating the air filter with dust and dirt are performed simultaneously. If the dust and dirt caught and held by the air filter subsequently contain moisture, it becomes a hotbed that increases mold and harmful microorganisms.Therefore, there is a case where the air filter is provided to contaminate the outside air and take it in the room. Had a problem. In addition, the air filter has an effect of lowering the conductance with respect to the air blowing, and the conductance further decreases as the amount of dust and dust captured and held increases.
At the same time, there was a problem of imposing a burden on the blowing capacity of the ventilation blower.

[0004]

SUMMARY OF THE INVENTION The ventilation blower of the present invention comprises:
In addition to providing at least a propeller fan and an air filter in an intake passage having a gas inlet and a gas outlet, the air filter is an inertial separation type dust collection filter and provided below the dust collection filter. A dust elimination passage having an opening and two openings on the gas intake side is provided, and a check valve for preventing gas from flowing in from the gas intake side opening is provided in the dust elimination passage. The driving method is that the propeller fan forms an airflow from the gas inlet to the gas outlet at a time before or after or at both times, from the gas outlet to the gas inlet, And forming an airflow to the gas inlet side opening of the dust elimination passage.

[0005]

The dust separation filter of the inertia separation type utilizes the effect that dust contained in the gas flowing into the filter from the gas intake side of the filter collides with the wall surface inside the filter and drops downward. . Lighter gas molecules pass through obstacles in the filter and reach the outlet of the filter, while heavy dust collides with the obstacles due to their strong inertia. This filter is characterized in that dust falls down and accumulates. In the present invention, the dust that has fallen and accumulated is discharged to the outside by blowing air. The function of dust emission and the like is to provide an opening at the lower part of the dust collecting filter and deposit the dust at the opening. Then, the accumulated dust is blown off from the indoor side to the outside. Due to the presence of the check valve, gas always passes through the dust collecting filter when taking in outside air.

[0006]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS An embodiment of the present invention will be described with reference to FIG. The embodiment shown in FIG. 1 is an example of a ventilation blower in which a through hole is provided in an outer wall of a building to ventilate a room, and a fan generally referred to as a pipe fan is also of this type. FIG. 1 shows an example in which a ventilation blower (9) is provided inside a hole (2) provided in a wall (1) with a square pipe sleeve (3 ') provided therein. The ventilation blower is provided with an intake bribe (8) and a dust elimination passage (10). The intake passage is provided with a propeller fan (4) and an inertial separation type dust collection filter (11). The outside air (5) is cleaned by the inertia separation type dust collection filter to remove dusts and become clean air (7) to be taken into the room. As an example of the inertial separation type dust collection filter, the present inventors have disclosed a Japanese Patent Application Laid-open No. Hei.
Inertia separation type dust filter disclosed in
-80413 and JP-A-8-80414. Dust accumulates and accumulates in the dust elimination passage to form accumulated dust (12). A check valve (13) is provided at the outlet of the dust elimination passage to prevent outside air from being blown into the dust elimination passage. An overhanging plate (14) is provided at the outlet of the dust elimination passage to reduce contamination of the wall surface with the discharged dust.

A driving method for obtaining clean air supply with the structure shown in FIG. 1 will be described. By operating the propeller fan, an airflow is generated in the direction from left to right in FIG. That is, the air supply (7) is generated. By this air supply, the dust in the outside air is captured by the inertia separation type dust collection filter by the operation described in the specification of Japanese Patent Application Laid-Open No. H2-220286. Part of the captured dust falls in the direction of gravity to become accumulated dust (12).

A description will now be given of discharging the generated accumulated dust in the structure shown in FIG. When discharging the accumulated dust, the propeller fan is operated to generate an airflow from right to left in FIG. That is, a headwind (15) is generated. Since this backward wind is in the forward direction for the check valve, the valve opens and the accumulated dust (12) passes over the overhanging plate (14) and is discharged out of the building. The overhanging plate is attached for the purpose of preventing the discharged accumulated dust from contaminating the outer wall. Some examples of the method of creating the head wind will be described. One method is to change the size and direction of the airflow by changing the angle of the blades of the propeller even though the propeller is rotating in the same direction. Another method is to reverse the direction of the rotation axis of the propeller without changing the angle of the blade of the propeller. As still another method, there is a method of changing both the direction of the propeller blades and the direction of the rotation axis to change the air supply and the reverse wind.

FIG. 2 shows an embodiment corresponding to claim 2 of the present invention. Example 2 is a timing chart showing a temporal change of the driving state of the ventilation blower shown in FIG. FIG. 2A shows the switching state of the switch of the ventilation blower, and FIG. 2I shows the actual air supply direction of the ventilation blower. When the switch is switched from the stop state to the operation state in FIG. 2A, a headwind is first generated as shown in FIG. The headwind discharges the dust. After the generation of the headwind is maintained for about 5 seconds, the generation of the headwind is attenuated, and thereafter, the air is supplied in the forward direction. Forward air delivery then continues until the switch is switched from active to inactive.

FIG. 2 shows an example in which the headwind is maintained for a predetermined period of 5 seconds. However, as another example, the amount of dust is detected by a sensor such as a weighing scale, and a dust filter or the like is provided with a predetermined cleanliness. The headwind may be maintained until it reaches a certain degree. As another example, a reverse wind may be generated in the same manner as described above at the switch switching timing from the operation to the stop in FIG.

[0011]

According to the ventilation blower of the present invention, it is possible to purify the outside air and send the air into the room without cleaning or replacing the filter for a long time. The accumulated dust can be released without increasing the number of propeller fans.

[Brief description of the drawings]

FIG. 1 is a sectional view corresponding to a first embodiment of the present invention.

FIG. 2 is a timing chart corresponding to the second embodiment of the present invention.

FIG. 3 is a sectional view of a conventional example.

[Explanation of symbols]

1 is a wall, 2 is a hole, 3 and 3 'are pipe sleeves, 4 is a propeller fan, 5 is outside air, 6 is an air filter, 7 is an air supply, 8 is an intake passage, 9 is a ventilation blower, and 10 is a dust removal passage. Numeral 11 denotes an inertial separation type dust collecting filter, 12 denotes accumulated dust, 13 denotes a check valve, 14 denotes an overhang plate, and 15 denotes a reverse wind.

 ──────────────────────────────────────────────────続 き Continued on the front page (72) Inventor Yoshiaki Masuno 4-4-14 Jonan, Fujisawa-shi, Kanagawa Prefecture (72) Inventor Yukihiko Tamura 1366 Tsurugamine Honcho, Asahi-ku, Yokohama-shi, Kanagawa Prefecture (72) Inventor Mitsuo Sugiura Setagaya, Tokyo (15) Inventor Masashi Hasegawa 2-5-1 Akabane Minami, Kita-ku, Tokyo Sankei Giken Kogyo Co., Ltd.

Claims (2)

[Claims] 1. A ventilation blower having at least a propeller fan and an air filter in an intake passage having a gas inlet and a gas outlet, wherein the air filter is an inertia separation type dust collecting filter, and the dust collecting filter is provided. A dust elimination passage having an opening provided at a lower portion of the air inlet and two openings on the gas intake side, and a check valve for preventing gas from flowing in from the gas intake side opening is provided in the dust elimination passage. A ventilation blower, comprising: 2. The method of driving a ventilation blower according to claim 1, wherein the propeller fan forms an airflow from the gas inlet to the gas outlet at a time before or after the airflow, or at both times. A method for driving a ventilation blower, comprising: forming an air flow from the gas outlet to the gas inlet and the gas inlet side opening of the dust removal passage.