JPH0531467Y2 - - Google Patents

Description

[Detailed description of the invention] [Technical field of the invention] This invention is installed at the entrance of a clean room, bio-clean room, or other clean room where high air cleanliness is required, and is designed to prevent the wear and tear of people entering the room. The present invention relates to an air shower room device for removing dust attached to articles.

[Technical background of the invention and its problems]

Generally, this type of air shower room device has a box-shaped main casing installed at the entrance and exit of a clean room such as the clean room mentioned above so as to form an air lock with the outside air, and a shower room that can be accessed from the outside is built into the main casing with a partition wall. In addition to having a partitioned structure, an air suction port and an air outlet are provided on the partition wall, and a blower and a high performance (HEPA) filter are installed on the outside of the shower room inside the main body casing.
When a worker or the like enters the shower room, this is detected by a sensor, etc., and the blower is activated, and this blowing action blows clean air that has been filtered by a high-performance filter into the shower room as jet air from the outlet. The jet air blows off the dust adhering to the clothes and body surfaces of the occupants, and the blown dust is sucked in by the blower from the suction port and filtered and collected again by a high-performance filter, and the purified air is The air is circulated and cleaned by blowing out the air from the outlet into the shower room as jet air.

By the way, in conventional air shower room equipment, the blower operates only when a worker enters the room and blows out high-pressure jet air for the required time to clean and circulate the air. There was no wind. For this reason, the air in the shower room cannot be purified during normal times, and if the blower is activated to start blowing and circulating the air only when a person enters the room, the cleanliness inside the shower room will be slow to rise. This method has a low air shower effect and requires a long injection time of high-pressure jet air, resulting in increased time loss for workers, leading to a decrease in productivity, and high power consumption, which is uneconomical.

Recently, there has been a desire to keep the shower room clean even when not entering the room, and for this reason, in addition to the above-mentioned high-pressure jet air circulation system equipped with the blower and high-performance filter, A system has been developed that is equipped with an air purifying circulation system equipped with a separate blower with a small air volume and a high-performance filter to filter and circulate the air in the shower room, albeit with a small air volume, to maintain cleanliness at all times. However, in a device that is equipped with both a jet air blowing circulation system and a small air volume air cleaning circulation system, and switching between these systems depending on the presence or absence of occupants, two systems with different air blowing capacities are used.
In addition to the need for a base blower, a circulation ventilation path each equipped with a high-performance filter is required, which complicates the overall configuration of the device and increases the cost.
There was a problem in that the size of the entire device became larger than the effective dimensions of the shower room. Another drawback was that the air volume could not be adjusted arbitrarily by simply switching between jet air blowing and small air volume air circulation.

[Purpose of invention]

This idea was devised in view of the above circumstances, and allows automatic control of the fan motor rotation speed, allowing the same system to perform high-pressure jet air blowout circulation when entering a room and small air volume air circulation at other times. It is an object of the present invention to provide an air shower room device that is effective in reducing costs and making the device more compact by simplifying the overall configuration of the device, as well as improving performance and reducing running costs.

[Summary of the idea]

In order to achieve the above-mentioned purpose, the air shower room device of this invention includes a detector inside the main casing that detects the intrusion of a person entering the shower room, and a detection operation of this detector to detect the air shower of the person entering the room. Is the fan's motor speed increased for a certain amount of time to increase the amount of air blown, and after the person who enters the room finishes air showering, the speed of the fan's motor is lowered and the amount of air blown is maintained at a low level until the intrusion of the next person is detected? , or the frequency of the blower's motor power supply, which lowers the blower's motor speed for a certain period of time necessary to purify the air in the shower room, lowers the air flow, and then stops the motor until the next entry is detected. The configuration is equipped with a rotation speed controller using a conversion inverter, and the inverter controls the motor rotation speed to automatically control the air volume of the blower to blow out and circulate high-pressure jet air when a person enters the shower room. The same blower can accurately perform small air volume air cleaning circulation at other times.

[Example of idea]

An embodiment of this invention will be described below with reference to FIGS. 1 to 4. In the figure, 1 is a vertical box-shaped main body casing installed at the entrance/exit of a clean room 2 such as a clean room to create an airlock with the outside, as shown in FIG. It is configured. In addition, entrances and exits 5 and 6 are provided at the front and rear of the shower chamber 3 and open through the front and rear walls of the main body casing 1, and single-swing doors 7 and 8 that can be opened and closed are installed therein. By opening the shower room 3, a worker or the like can temporarily enter the shower room 3 from the outside, and from there, by opening the door 8 at the back, they can go to the clean room 2.

The left and right partition walls 4 of the shower chamber 3 are each provided with an air outlet 9 over a wide range in the center thereof. The air outlet 9 penetrates through a concave plate 9a recessed from the inside of the shower room of the partition wall 4, and is connected to a plurality of air outlet nozzles 9b, respectively.
The tip of each blow-out nozzle 9b is directed toward the inside of the shower chamber 3. Further, a suction port 10 is provided at the lower part of the partition wall 4 on one side, and a prefilter 11 is attached to this suction port 10.

Furthermore, the air between the inner surface of the main body casing 1 and the outer surface of the partition wall 4 that constitutes the shower chamber 3 and extends from the left and right to the ceiling is configured as a series of ventilation passages 12, and the lower end of one side of the ventilation passage 12 Blower 13
is installed adjacent to the prefilter 11 of the suction port 10. Note that this blower 13 has a built-in drive motor 14 whose rotation speed can be varied by converting and controlling the power supply frequency. The blower 1
The discharge port 13a protruding upward from the partition wall 1
5, and is connected in internal communication with an air chamber 16 fixedly installed above the air chamber 16. A high performance (HEPA) filter 17 is provided in close contact with the opening surface 16a of the air chamber 16. Then, due to the blowing action of the blower 13, air is sucked from the shower chamber 3 from the suction port 10 through the pre-filter 11 and is filtered and collected from the air chamber 16 through the high-performance filter 17, thereby being purified. Air passes through the ventilation passage 12 and is blown out into the shower chamber 3 from the respective blowout nozzles 9b of the blowout ports 9 of the left and right partition walls 4.

Here, a light emitting element 18a and a light receiving element 18b, which are optical sensors such as phototubes, are installed on the intermediate opposing inner surfaces of the left and right partition walls 4 of the shower room 3 slightly below the air outlet 9 as detectors for detecting persons entering the room. It is provided. In addition to the optical sensor, this detector may also be a mat switch (tape switch, etc.) placed on the floor or the like, a limit switch linked to the opening and closing of the doors 7 and 8, and the like. In addition, a rotation speed controller 19 for the drive motor 14 of the blower 13 is installed in a relatively unobtrusive position such as near the top of one side of the ventilation passage 12 in the main body casing 1 in order to vary the amount of air blown by the blower 13. A timer 20 is provided next to the rotation speed controller 19 and the timer 20.
The motor 14 and the detector are connected by a predetermined electric circuit. Its rotation speed controller 19
is an inverter that converts the frequency of the motor power supply, and when the detector detects the entry of a worker, etc., it operates together with the timer 20, and the timer 2 is activated.
The rotation speed of the motor 14 of the blower 13 is automatically increased by the required time (about 10 seconds) determined by the timer 20, and after the timer 20 expires, the motor 1 of the blower 13 is
In order to automatically lower the number of revolutions of the motor, the motor operating frequency can be changed between when blowing jet air and when other small air volume cleaning circulation is being carried out. Note that the motor operating frequency can be arbitrarily adjusted and set as necessary by operating the respective setting dials.

To describe the operation of the above-mentioned configuration, first, during normal times when no one is present in the room, the drive motor 14 of the blower 13 is lowered to a low speed by the inverter of the rotation speed controller 19, and the blower 13 is The low air volume operating state shown in the figure is maintained, and as a result, the air in the shower chamber 3 is slowly sucked in from the lower suction port 10 via the pre-filter 11, and then from the blower 13 through the air chamber 16 to the high-performance filter 17.
There, it is filtered and cleaned, passed through the ventilation passage 12, and blown into the shower chamber 3 from the respective blow-off nozzles 9b of the left and right blow-off ports 9, and then again into the lower suction port 10.
It is circulated while being filtered and collected. In this way, the inside of the shower room 3 is always maintained in a clean state.

In such a state, when a worker or the like opens the exterior door 7, enters the shower room 3 through the entrance 5, closes the door 7, and goes to the center of the shower room 3, the light emitting element 18a, which is a detector, Element 18
The person entering the room is detected by b, and the timer 20 for setting the jet air blowing time starts operating based on this entry detection signal, and at the same time, the rotation speed controller 19
The inverter operates and the motor 1 of the blower 13
Convert the power frequency of 4 to a higher setting value. This automatically increases the rotation speed of the motor 14, and the blower 13 increases the air volume as shown in FIG. Speech out,
Blow away dust that has adhered to the body or clothing of the person entering the room. The blown dust is then passed through the suction port 10 to the prefilter 11 together with the air in the shower chamber 3.
The air is sucked in by the blower 13 through the air chamber 16 and filtered and collected by the high performance filter 17. When the air shower operation is performed on the person entering the room, and when the timer 20 expires after the time set by the timer 20 (approximately 10 seconds), the inverter of the rotation speed controller 19 operates and the motor of the blower 13 is activated. 14 is converted to a lower setting value, the rotation speed of the motor 14 is automatically lowered, the air volume of the blower 13 is reduced, and the initial low air volume air circulation state is returned to, and the air circulation inside the shower room 3 is reduced. Maintain cleanliness. In this way, the system waits until the person entering the room is detected again. The person entering the room who has taken the air shower opens the door 8 and goes to the clean room 2 such as a clean room.

Note that this invention is not limited to the above-mentioned embodiment, and for example, in addition to the above-mentioned timer 20, another timer (not shown) may be provided to control the rotation speed based on the intrusion detection signal of the person entering the room. Vessel 1
The inverter 9 operates to increase the rotation speed of the motor 14 of the blower 13 to increase the air volume, and air shower operation is performed for the person entering the room using jet air for the time set by the timer 20. After that, the rotation speed controller 19 The inverter operates to lower the rotational speed of the motor 14 of the blower 13 to purify the air in the shower room 3 in a low air volume air circulation state. At this time, the another timer is activated as shown in FIG. It is also possible to maintain the low air flow rate air circulation state for a certain period of time necessary to purify the air in the shower room, and then to stop the motor and wait until the next detection of an intruder.

[Effect of idea]

As mentioned above, the air shower room device of this invention includes a detector inside the main casing that detects the intrusion of a person entering the shower room, and the detection operation of this detector causes the air blower to be turned on for the time required for the air shower of the person entering the room. In addition to increasing the airflow rate by increasing the motor rotation speed, after the air shower of the occupant is finished, the fan motor rotation speed is lowered to maintain the airflow rate at a low level until the next occupant is detected, or the airflow rate is maintained at a low level by the shower room air. An inverter is used to convert the frequency of the blower's motor power supply, which lowers the blower's motor speed for a certain period of time necessary for cleaning, lowers the air flow, and then stops the motor until the next entry is detected. Since the configuration is equipped with a rotation speed controller, the air flow rate of the blower can be automatically controlled by controlling the motor rotation speed using the inverter, and the high-pressure jet air can be blown out and circulated when a person enters the shower room, and for other purposes. It is possible to accurately perform small air volume air purification circulation with the same blower, and to reduce costs and make the device more compact by simplifying the overall configuration of the device.In addition, the air volume of the blower can be controlled by motor rotation speed using an inverter. By doing so, it is possible to save energy and reduce running costs, and it is also possible to precisely adjust the air volume of the blower.

[Brief explanation of drawings]

Figures 1 to 4 show an embodiment of this invention, in which Figure 1 is a longitudinal sectional view, Figure 2 is a sectional view taken along the - line in Figure 1, Figure 3 is a plan view, and Figure 3 is a plan view. FIG. 4 is an explanatory diagram showing the operating state in the form of a chart graph, and FIG. 5 is an explanatory diagram showing the operating state in another embodiment of this invention in the form of a chart graph. 1... Main body casing, 3... Shower room, 4
...Bulkhead, 5,6...Entrance/exit, 7,8...Door,
9...Blowout port, 9a...Blowout nozzle, 10...Suction port, 11...Prefilter, ventilation path, 13...
Blower, 14... Motor, 17... High performance filter, 18a, 18b... Detector, 19... Rotation speed controller (inverter), 20... Timer.

Claims (1)

[Scope of utility model registration request] A shower chamber that can be entered and exited from the outside is partitioned into the main body casing by a partition wall, an air suction port and an air outlet are provided in the partition wall, and a ventilation passage is formed between the inner surface of the main body casing and the outer surface of the shower room, A blower and a high-performance filter are installed in this ventilation passage, and the air in the shower room is sucked through the suction port by the blowing action of the blower, filtered by the high-performance filter, and then blown into the shower room from the outlet through the ventilation passage. In the air shower room device configured, the blower has a built-in drive motor whose rotation speed can be varied by converting and controlling the power frequency, and a detector is provided to detect the intrusion of a person into the shower room. By the detection operation of this detector, the rotation speed of the drive motor of the blower is increased by the time required for the air shower of the room occupant to increase the amount of air being blown, and after the air shower of the room occupant is finished, the next room occupant will not enter the room. Either reduce the rotation speed of the blower drive motor and maintain the air flow rate low until detection, or reduce the rotation speed of the blower drive motor and keep the air flow rate low for a certain period of time necessary to clean the air in the shower room, and then 1. An air shower room device comprising: a rotation speed controller using an inverter for converting the frequency of a motor power source, which stops the drive motor until detection of an intrusion of a person entering the room.