JPH0537156Y2 - - Google Patents

Description

[Detailed Description of the Invention] [Industrial Application Field] The present invention relates to a cleaning work device suitable for handling highly dangerous substances such as microorganisms and chemicals harmful to the human body.

[Conventional technology]

When handling microorganisms or chemicals harmful to the human body, a means of making the work space negative compared to the surroundings is adopted to prevent infection not only to the handler but also to the surrounding environment. This device for making the work space negative sets the degree of sealing of the casing and the degree of negative pressure of the work space according to the degree of danger of the handled item. However, since it is effective to handle items with a medium degree of danger even if the work space is open, the second method was conventionally used.
The apparatus shown in FIG. 3 was used.

The first conventional device shown in FIG.
A blower 24 is installed below the workbench 23, and a high-performance filter 25 is installed above the workspace 22, and the exhaust air from the blower 24 is passed through an air conduction duct provided on the back of the main body case 21. Work space 22 via air conduction duct and high performance filter 25
At the same time, the air flow in the air guide duct passes through a filter 26 provided at the upper part of the main body case 21, and is then discharged from the main body case 21 through an exhaust port 27.
It is configured so that it can be exhausted to the outside.

Therefore, the blower 24 is operated, and the blower 24 sucks the air in the work space 22 and guides it to the air guide duct on the back of the main body case 21, but a part of the exhaust air is passed through the filter 26 and sent from the exhaust port 27 to the main body case 21. By exhausting the air to the outside, the inside of the work space 22 can be made to have a negative pressure. If all of the exhaust air from the blower 24 is led back into the work space 22, the work space is unlikely to become under negative pressure. A part of the air forced into the blower 24 is released from the exhaust port 27 to the outside of the main body case 21, and some of the air is discharged from the filter 25.
The working space was constructed to obtain a negative pressure by creating a circulation flow path through which the purified air flows to the working space 22.

The second conventional device shown in FIG. 3 is more secure than the first conventional device by sucking in more air from the outside.
A suction blower (not shown) is connected to an exhaust port 33 equipped with a filter 32 inside the main body case 31 so that a part of the circulating air inside can be forcibly released to the outside, and the air is guided to the exhaust port 33. guide plate 3
4 was set up. The guide plate 34 can partially discharge air to the workbench 36 side of the workroom. A high-performance filter 35 is provided below the workbench 36 for the purpose of increasing dust collection efficiency and increasing the safety of air leaking while reaching the exhaust filter 32 described above. Therefore, the air above the workbench 36 is filtered by the high-performance filter 35, and then sent to the filter 32 through a duct inside the main body case 31 by the blower 37, and then sucked and discharged from the discharge port 33 by the blower (not shown). ing. Meanwhile, part of the air flow passes through the guide plate 35 and enters the work space. For this reason, in the second embodiment, it is possible to increase the flow rate of the air sucked and exhausted by the blower 37, which in turn increases the inflow wind speed from the front opening of the workbench 36, and , making it easy to set up.

[Problem that the invention attempts to solve]

A work space with an open front is formed inside the main body case, and air from the work space and outside is sucked in using the suction power of the blower, creating a negative pressure in the work space.
A cleaning work device configured to prevent air from flowing out from the front of the work space reduces the negative pressure in the work space by releasing part of the air circulating inside the main body case to the outside. However, as shown in the first conventional device, a part of the air is naturally released to the outside by the pressure of the circulating air, and the second conventional device For devices with a structure that forcibly releases part of the circulating air to the outside, a filter is used to purify the air sent to the work space because the pressure of the air flow circulating inside the main body case is different. Despite the fact that the installation locations were different and the equipment and materials used were almost the same, there was no compatibility in manufacturing the two, resulting in a lot of waste. In addition, in the structure of the first conventional device, in which the air forced by the blower is purified just before the work space, the air circulating inside the main body case is contaminated, and if there is a gap in the main body case, it can be leaked to the outside. There was also a problem with leaks.

The present invention is a cleaning device configured to solve the above problems.

[Means for solving problems]

A work space with an open front is formed in the vertical middle of the vertical box-shaped main body case, and
There is no difference from the conventional device in that the exhaust port is opened in the ceiling of the main body case, and a blower is installed inside the main body case, and the suction power of this blower creates a negative pressure in the work space. The point where external air is sucked into the main body case from the front is also the same as the conventional technology, but a chamber is installed inside the main body case to prevent air sucked from the work space and the outside from leaking from the main body case. Established. The chamber was provided with an opening communicating with the work space and an opening communicating with the exhaust port, and these were connected to each other. Further, two blowers were attached by connecting a blower port to the chamber, and the air sucked by the blowers was directly forced into the chamber. To handle harmful microorganisms, use one with the above structure. If it is necessary to increase the degree of negative pressure in the work space, such as when handling products such as pharmaceuticals, install a partition plate inside the chamber to guide all the air sent out from one blower to the exhaust port. It was configured as follows.

[Effect]

When manufacturing the cleaning work device of this invention, a partition plate is installed in the chamber when handling items with minute particles such as drugs or highly infectious and dangerous microorganisms. If the product is not a product, there is no need to provide a partition plate in the chamber, and the device can be manufactured in accordance with the product by simply changing whether or not to provide a partition plate in the chamber. In the case of a normal type without a partition plate inside the chamber,
When the blower is operated, air from the work space and outside is sucked into the chamber by the suction force and forced into the chamber. Due to the suction power of this blower, the inside of the main case except the inside of the chamber becomes negative pressure, and contaminated air does not leak out of the main case. Furthermore, even if contaminated air leaks from the chamber, it is sucked into the blower and sent back into the chamber. As the pressure increases, a portion of the air inside the chamber is purified by a filter and released outside the main case, and the remaining air is purified by a filter, flows into the work space, is sucked into the blower, and repeats this process.

In the case where a partition plate is installed inside the chamber, the air discharged from one of the blowers is guided by the partition plate and is all discharged from the exhaust port to the outside of the main body case, reducing the pressure sent to the work space. Since air is taken in by two blowers, the degree of negative pressure in the work space increases, and the amount of air sucked in from the outside in front of the work space also increases, preventing leaks of contaminated air.

〔Example〕

An example of the implementation of the device of the present invention will be described below with reference to the drawings.

Reference numeral 1 denotes a vertically elongated box-shaped main body case, which has an opening in the middle of the front wall, and the inside thereof is surrounded by a partition wall 2 to form a work space 3. Reference numeral 4 denotes a door that slides in the vertical direction through its entire opening. Reference numeral 5 denotes an exhaust port opened in the ceiling portion 6 of the main body case 1.
A chamber 7 is fixed on the partition wall 2 surrounding the work space 3, and has openings 8 and 9 at the top and bottom, respectively.The upper opening 8 is connected to the exhaust port 5, and the lower opening 9, 9 is connected to ventilation holes 10 , 10 opening in the partition wall 2 and leading to the work space 3 . 1
1 is a filter provided at the exhaust port, and 12 and 13 are filters provided at the vent to the work space 3. 14,1
Reference numeral 5 represents a blower, and each blower opening is attached to the chamber 7. Reference numeral 16 denotes a partition plate for guiding all the air discharged from the second blower 15 into the chamber 7 to the exhaust port 5, and the partition plate 16 is used to guide all the air discharged from the second blower 15 into the chamber 7 to the exhaust port 5. When increasing the amount, it is fixedly provided within the chamber 7 by welding or the like.

[Effect of idea]

The device of this invention has a chamber inside the main body case that communicates with the exhaust port and the work space, and two blowers are installed in the chamber.
If one of the blowers is used for exhaust, increasing the negative pressure in the work space and increasing the amount of outside air sucked in, it is only necessary to install a partition plate inside the chamber. It is possible to eliminate the waste of having to manufacture individual parts, simplify manufacturing, and improve economic efficiency. The following is an example of a comparison between a device provided with the above-mentioned partition plate and a device not provided with the partition plate for the biohazard cabinet class. The class corresponds to viruses with a medium risk according to the standards established by the National Institute of Preventive Health.The work table is a flat table, and the filters are Hepa filters for both the air supply and exhaust air filters, and the dust collection efficiency is improved. It is 99.99% or more at 0.3 μm. When a device without a partition plate is called A and a device with a partition plate is called B, and the blower is operated under the same conditions,
A is exhaust approximately 8m ³ /min, air supply (to work space) 14
m ³ /min (approximately 0.30 mm/sec), and the inflow air velocity from the full-face opening is approximately 0.5 mm/sec, whereas for B, the exhaust air velocity is approximately 10 mm/sec.
m ³ /min, air supply rate is approximately 13 m ³ /min (approximately 0.28 mm/sec), and the inflow wind speed from the opening on the entire surface is approximately 0.6 mm/sec. That is, the difference between A and B is the difference in inflow wind speed between the entire openings. Note that the above A and B have the same configuration except for the partition plate.

Further, inside the main body case, only the inside of the chamber is a positive pressure point for contaminated air, so leakage of contaminated air to the outside of the main body case can be completely prevented.

[Brief explanation of the drawing]

Fig. 1 is a front view of an example of the implementation of the device of the present invention, partially cut away to show the internal structure;
The figure is a vertical side view showing a first conventional device, and FIG. 3 is a vertical side view showing a second conventional device. 1...Main body case, 3...Work space, 5...Exhaust port, 7...Chamber, 14, 15...Blower, 16...Partition plate.

Claims (1)

[Scope of utility model registration request] A work space is formed inside the main body case, and a blower is installed inside the main body case, so that the blower generates a circulating flow of air within the main body case, and a part of the circulating air is exhausted from the main body case. In a cleaning work device configured to emit air from the mouth and maintain a negative pressure in a work space by the suction force of a blower, a chamber is provided in the main body case with an opening connected to the work space and an opening connected to the exhaust port. When installing two blowers by connecting an air outlet to the chamber and increasing the negative pressure in the work space, guide the air sent from one of the blowers into the chamber to the exhaust outlet. A cleaning work device characterized by being provided with a partition plate.