JP2022086442A - Safety cabinet - Google Patents

Abstract

To provide a safety cabinet that prevents stagnation of air in a work chamber and reduces wetting of a pre-filter with water in a case where a faucet or a sink is provided in the work chamber.SOLUTION: A safety cabinet that takes in air from a front surface of a work chamber, takes out air in the work chamber from a rear surface, purifies the air to discharge it outside, includes: an opening/closing shutter (13) provided on the front surface of the work chamber (12); an air suction port (15) that is in the rear surface of the work chamber and provided higher than a bottom surface of the work chamber; an air flow passage (16) provided behind the work chamber; a purifying filter (17) that purifies air from the air passage; an exhaust fan (18) that discharges the purified air; and a pre-filter (33) provided in the air suction port; in which the pre-filter is provided at an angle in the air suction port such that a lower end thereof is located behind the air passage and an upper end thereof is located in front of it.SELECTED DRAWING: Figure 3

Description

The present invention relates to a safety cabinet used for medical examinations and the like.

Pathological diagnosis such as histology and cytopathology is performed as a detailed examination of the disease. Histological examination is a method in which a part of an organ or the like is cut out and its flakes are observed with a microscope, and cytodiagnosis is a method in which cells of a raw sample are collected by centrifugation and observed under a microscope. In recent years, the proportion of cytopathology has increased. Safety cabinets are used to prevent infection in pathological examinations such as histology and cytopathology.

As an example of a safety cabinet for medical examination, Patent Document 1 describes a cabinet body having an opening / closing means on the front surface to form a work space for medical examination inside, and an upper part of the cabinet body in the work space from the outside. A ceiling provided with an air passage portion for air rectification through which the introduced air passes, a work table having an air outlet provided in the work space of the cabinet body, and air derived from the air outlet. A safety cabinet for medical examination, which includes a filter that passes through and an exhaust fan that exhausts air that has passed through this filter to the outside, has a sink on the workbench of the cabinet body, and has a water supply / drainage device on the sink, is disclosed. (See the scope of patent claims).

Japanese Unexamined Patent Publication No. 2000-279161

Some safety cabinets for pathological diagnosis are equipped with faucets and sinks in the work room for washing organs with water. In addition, some safety cabinets for tissue diagnosis are equipped with a centrifuge in the work room.

A pre-filter is provided at the air suction port in the work room, but if the pre-filter gets wet with water, the flow path resistance increases and the performance cannot be maintained. In addition, if equipment such as a centrifuge is installed in the work room, stagnation may occur in the air flow in the work room.

Patent Document 1 discloses a safety cabinet provided with a water supply / drainage device and a sink, but does not take into consideration the improvement of water wetting of the prefilter and the improvement of air stagnation in the work room.

An object of the present invention is to provide a safety cabinet that improves air stagnation in a work room and reduces water wetting of a prefilter when a faucet or a sink is provided in the work room.

To give an example of the "safety cabinet" of the present invention for solving the above problems,
A safety cabinet that takes in air from the front of the work room, takes out the air in the work room from the back, cleans it, and discharges it to the outside. An air suction port provided above the bottom surface of the work room, an air flow path provided on the rear side of the work room, a cleaning filter for purifying the air from the air flow path, and cleaning. The pre-filter includes an exhaust fan for discharging the turned air and a pre-filter provided at the air suction port, and the lower end of the pre-filter is located at the rear side of the air flow path at the air suction port and the upper end thereof. It is characterized in that it is provided at an angle so as to be located on the front side.

According to the present invention, by providing an inclined pre-filter at the air suction port on the back surface of the work room, it is possible to provide a safety cabinet in which air stagnation due to equipment or the like in the work room is improved.

Further, when a faucet or a sink is provided in the work room, it is possible to reduce water wetting of the pre-filter.

Issues, configurations and effects other than those described above will be clarified by the description of the following embodiments.

It is a figure which shows the safety cabinet examined prior to this invention. It is a figure which shows the detail of the work room of the safety cabinet examined prior to this invention. It is a figure which shows the safety cabinet of Example 1 of this invention. It is a figure which shows the flow of the air flow of the safety cabinet examined prior to the Example and the present invention. It is the figure which analyzed the flow of the air flow in a work room. It is the figure which analyzed the flow of the air flow of the equipment part in a work room. It is a figure which shows the safety cabinet of Example 2 of this invention. It is a figure which shows the exchange procedure of a pre-filter. It is a figure which shows the exchange procedure of a pre-filter.

Before explaining the embodiment of the present invention, the safety cabinet examined prior to the present invention will be described. 1 (a) shows a schematic perspective view of the safety cabinet, and FIG. 1 (b) shows a schematic side view of the safety cabinet as seen from the right side of the AA'cross section of FIG. 1 (a).

Inside the safety cabinet housing 11 that constitutes the safety cabinet, there is provided a work room 12 in which the worker puts his or her hands into the work. The front surface of the work room 12 is provided with an opening / closing shutter 13 that slides up and down to open and close. The open / close shutter 13 is made of a transparent material such as glass or hard plastic, and the inside of the work room can be seen. An air suction port 15 for sucking air in the work room is provided on the back side of the work room 12. In a class 1 safety cabinet, the air suction port is generally provided on the bottom side of the back wall, but in this safety cabinet, in consideration of the spray from the water source described later, the air suction port is above the bottom surface and in the vertical direction. It is located near the center. The air suction port 15 is provided with a pre-filter 33 so as to cover the air suction port, and the pre-filter 33 removes relatively large particles such as dust. Behind the work room 12, an air flow path 16 for flowing air sucked from the air suction port 15 is provided, and an air purification filter 17 such as a HEPA filter is provided at the end of the air flow path 16 as a main filter. There is. An exhaust fan 18 and a chamber 19 are provided to create an air flow and exhaust the air.

FIG. 1B shows the flow of airflow with arrows. The air taken into the working room 12 from the opening at the lower part of the opening / closing shutter 13 on the front surface is sucked from the air suction port 15 on the back wall of the working room 12. Then, it is sent to the air purifying filter 17 through the air flow path 16 to be cleaned. Then, the exhaust fan 18 discharges the air from the chamber 19 to the outside.

FIG. 2 is a perspective view showing details of the work room. A sink 22 is provided on the work table surface at the bottom of the work room, and a faucet 21 is provided above the sink 22. Further, the sink 22 is provided with a cutting table 23 for cutting out a sample from an organ or the like. A raising table 26 is provided on the work table surface, and equipment such as a centrifuge 27 can be arranged on the raising table 26. A pre-filter 33 is attached to the air suction port 15 provided on the back wall of the work room so as to cover the air suction port. Further, a germicidal lamp 25 is provided above the pre-filter 33, and after using the safety cabinet, the work room can be sterilized by ultraviolet rays.

In the figure, reference numeral 28 indicates a work outlet, reference numeral 29 indicates a shutter stopper for stopping the opening / closing shutter 13 at an arbitrary position, and reference numeral 31 indicates an electric component storage unit 31.

The operator inserts his / her hand into the work room 12 through the opening at the bottom of the open / close shutter 13 to perform the work. In order to handle organs including pathogens in the work room, the air in the work room is sent to the air purification filter 17 through the air suction port 15 and the back flow path 16. Then, the pathogen and the like are removed by the air purifying filter 17, and the exhaust fan 18 exhausts the air to the outside.

In such a safety cabinet, if the air suction port 15 in the work room is provided near the center in the vertical direction above the bottom surface side in consideration of the spray of water from the water source, stagnation may occur in the air flow. Occurs. Further, when the faucet 21 which is a water source is close to the air suction port 15, the pre-filter 33 may get wet, and when the pre-filter gets wet with water, the flow path resistance increases and the performance of the safety cabinet cannot be maintained. There is a fear.

The present invention provides a safety cabinet with improved air stagnation in the work room. Further, when a faucet or a sink is provided in the work room, a safety cabinet capable of reducing water wetting of the pre-filter is provided.

Hereinafter, examples of the present invention will be described with reference to the drawings. In addition, in each figure for demonstrating an embodiment, the same constituent elements are given the same name and reference numeral, and the repeated description thereof will be omitted.

FIG. 3 shows an example of the safety cabinet according to the first embodiment of the present invention. FIG. 3A is a detailed view of the work room of the safety cabinet, and FIG. 3B is a cross-sectional view of the work room as viewed from the right.

Similar to FIG. 2, the work room 12 is provided with a sink 22 on the work table surface at the bottom of the work room, and a faucet 21 is provided above the sink 22. Further, a germicidal lamp 25 is provided above the pre-filter, and after using the safety cabinet, the work room can be sterilized by ultraviolet rays. Further, although not shown in the figure, a raising table 26 is provided on the work table surface, and equipment such as a centrifuge 27 can be arranged on the raising table 26.

The back wall of the work room is provided with an air suction port 15 at a position above the bottom surface and close to the center in the vertical direction. A pre-filter 33 is attached to the air flow path 16 connected to the air suction port 15 by a pre-filter cover 34. Although not shown, the pre-filter cover 34 is provided with a plurality of holes on the front surface so that air can pass through.

The feature of this embodiment is that the pre-filter 33 is attached at an angle and tilted. That is, the quadrangular plate-shaped pre-filter is attached at an angle α so that the lower portion thereof is located behind the back wall of the work room.

According to this embodiment, if the air suction port 15 on the back wall of the work room is provided above the bottom surface side and near the center in the vertical direction, stagnation may occur in the air flow, but the pre-filter is used. Since the lower part of the airflow is inclined and attached to the air flow path 16 so as to be located behind the back wall of the work room, the stagnation of the airflow can be improved.

FIG. 4 shows the airflow flow of the safety cabinet examined prior to the present invention and the safety cabinet of the present embodiment. FIG. 4A is a safety cabinet examined prior to the present invention, and FIG. 4B is a safety cabinet of the present embodiment. As shown by the dotted line frame in the figure, in the corner of the work room below the air suction port 15, the airflow is directed upward in the safety cabinet examined prior to the present invention, but in the safety cabinet of the present embodiment, the airflow is directed upward. The airflow flows smoothly toward the inclined prefilter, and the stagnation of the airflow can be improved.

FIG. 5 shows the results of airflow analysis in a place where no equipment is provided in the work room. The air in the work room is sucked into the air suction port 15 without stagnation.

FIG. 6 shows the results of airflow analysis at a place where equipment is provided in the work room for the safety cabinet examined prior to the present invention and the safety cabinet of the present embodiment. FIG. 6A is a safety cabinet examined prior to the present invention, and FIG. 6B is a safety cabinet of the present embodiment. As shown by the dotted line frame in the figure, the air flow is smooth on the front side of the pre-filter, and the stagnation of the air flow is improved.

Further, according to the present embodiment, the pre-filter is attached at an angle so that the lower portion thereof is located behind the back wall of the work room in the air flow path, so that the pre-filter is less likely to get wet. can do. The water flow from the faucet and the spray when the worker uses the water are mainly scattered downward in a fan shape. In this embodiment, the pre-filter is installed at an angle so that it is located higher than the bottom surface of the work room and the lower portion thereof is located behind the back wall of the work room, so that the pre-filter is sprayed with water. This is less likely to occur, and water wetting can be reduced. Then, it is possible to prevent an increase in the flow path resistance of the prefilter due to water wetting and maintain the performance of the safety cabinet.

FIG. 7 shows a safety cabinet according to a second embodiment of the present invention. FIG. 7 (a) is an overall view of the work room of the safety cabinet, and FIG. 7 (b) is an enlarged cross-sectional view of the vicinity of the air suction port of the work room as viewed from the right. Further, FIGS. 8A and 8B show a procedure for replacing the pre-filter.

The second embodiment of the present invention facilitates the replacement of the pre-filter. In the safety cabinet examined prior to the present invention shown in FIG. 2, the prefilter 33 is vertically attached to the back wall of the work room, and the germicidal lamp 25 is provided on the upper side of the prefilter 33. Therefore, in order to replace the pre-filter 33, it is necessary to remove the germicidal lamp 25 or remove the entire pre-filter cover to which the pre-filter 33 is attached.

In this embodiment, the pre-filter 33 is arranged so as to be inclined so that the lower end is located behind the air flow path 16, and is attached by the pre-filter cover 34. The upper end of the pre-filter cover 34 is fixed by a mounting screw 35 or the like, and the pre-filter cover 34 can be tilted forward by loosening the mounting screw 35.

8A and 8B show the procedure for replacing the prefilter. As shown in FIG. 8A (a), loosen the mounting screw 35 of the pre-filter cover 34. Then, as shown in FIG. 8A (b), the pre-filter cover 34 is tilted forward so that the pre-filter 33 can be taken out. and. As shown in FIGS. 8B (c) and 8B (d), the pre-filter 33 is sequentially pulled out from above the pre-filter cover 34.

To attach the pre-filter 33, insert the pre-filter 33 from above the pre-filter cover 34, return the pre-filter cover 34, and attach the pre-filter 33 with the mounting screws 35.

According to this embodiment, since the pre-filter is arranged in an inclined manner and the pre-filter cover 34 to which the pre-filter 33 is attached is attached so as to be inclined forward, the pre-filter can be easily replaced and maintainability is improved. Can be improved.

11 Safety cabinet housing 12 Work room 13 Open / close shutter 15 Air suction port 16 Air flow path 17 Air purification filter 18 Exhaust fan 19 Chamber 21 Faucet 22 Sink 23 Cutout stand 25 Germicidal lamp 26 Raising stand 27 Centrifugal separator 28 Work Outlet 29 Shutter stopper 31 Electrical component storage 33 Pre-filter 34 Pre-filter cover 35 Mounting screw

Claims (6)

A safety cabinet that takes in air from the front of the work room, takes out the air in the work room from the back, cleans it, and discharges it to the outside.
An open / close shutter provided on the front of the work room and
An air suction port provided on the back surface of the work room and above the bottom surface of the work room.
The air flow path provided on the rear side of the work room and
A cleaning filter that purifies the air from the air flow path,
An exhaust fan that discharges clean air and
The pre-filter provided at the air suction port and
Equipped with
The pre-filter is a safety cabinet provided with an inclination so that the lower end of the air suction port is located on the rear side of the air flow path and the upper end is located on the front side of the air flow path. The safety cabinet according to claim 1.
The air suction port is a safety cabinet provided at a substantially central portion in the vertical direction on the back surface of the work room. The safety cabinet according to claim 1.
The work room is equipped with a faucet.
A safety cabinet characterized by having a sink on the bottom surface of the work room. The safety cabinet according to claim 1.
A safety cabinet characterized in that the working room is equipped with equipment such as a centrifuge. The safety cabinet according to claim 1.
The pre-filter is attached with a pre-filter cover and is attached.
A safety cabinet that is configured to be removable by tilting the pre-filter cover. The safety cabinet according to claim 5.
A safety cabinet characterized in that a germicidal lamp is provided above the pre-filter.

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