JP7408532B2 - safety cabinet - Google Patents

Description

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

Pathological diagnosis such as histology and cytology is performed as a detailed examination of the disease. Histological diagnosis is a method in which a part of an organ is cut out and a thin section thereof is observed under a microscope, and cytodiagnosis is a method in which cells from a biopsy are collected by centrifugation and observed under a microscope. In recent years, the proportion of cytodiagnosis has increased. Safety cabinets are used in pathological examinations such as histology and cytology to prevent infection.

As an example of a safety cabinet for medical examinations, Patent Document 1 discloses a cabinet body that has opening/closing means on the front and forms a working space for medical examinations inside, and a cabinet body that has an opening/closing means on the front and forms a working space for medical testing inside, and a ceiling provided with an air passage section for air rectification through which the introduced air passes; a workbench having an air outlet provided in the work space of the cabinet body; A safety cabinet for medical testing is disclosed, which is equipped with a filter that passes through the filter, an exhaust fan that exhausts the air that has passed through the filter to the outside, a sink provided on the workbench of the cabinet body, and a water supply and drainage device provided in the sink. (See claims).

Japanese Patent Application Publication No. 2000-279161

Some safety cabinets for pathological diagnosis are equipped with a faucet or sink in the work room for washing organs. Furthermore, some safety cabinets for tissue diagnosis are equipped with a centrifuge in the work room.

A pre-filter is provided at the air intake port in the work chamber, but if the pre-filter gets wet, flow resistance increases and performance cannot be maintained. Furthermore, if equipment such as a centrifuge is installed in the work room, there is a risk that stagnation will occur in the air flow within the work room.

Patent Document 1 discloses a safety cabinet equipped with a water supply and drainage device and a sink, but does not take into consideration the prevention of water wetting of the pre-filter and the improvement of air stagnation in the working room.

SUMMARY OF THE INVENTION An object of the present invention is to provide a safety cabinet that improves air stagnation in a work room and reduces the risk of a pre-filter getting wet when a faucet or sink is provided in the work room.

An example of the "safety cabinet" of the present invention for solving the above problems is as follows:
A safety cabinet that takes in air from the front of the work room, takes out the air from the back of the work room, purifies it, and discharges it to the outside,
an opening/closing shutter provided on the front surface of the work chamber; an air suction port provided approximately in the vertical center of the back surface of the work chamber and above the bottom surface of the work chamber; a pre-filter provided, an air flow path provided at the rear side of the work chamber, a cleaning filter that purifies the air from the air flow path, an exhaust fan that exhausts the purified air, and a and a sink provided at the bottom of the work chamber,
The pre-filter is provided at an angle at the air suction port so that the lower end is located on the rear side of the air flow path and the upper end is located on the front side.

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

Furthermore, if a faucet or sink is provided in the work room, it is possible to reduce the chance of the pre-filter getting wet.

Problems, configurations, and effects other than those described above will be made clear by the following description of the embodiments.

FIG. 2 is a diagram showing a safety cabinet studied prior to the present invention. FIG. 2 is a diagram showing details of the inside of a work chamber of a safety cabinet studied prior to the present invention. 1 is a diagram showing a safety cabinet according to a first embodiment of the present invention. It is a figure which shows the flow of the airflow of the safety cabinet investigated prior to an Example and this invention. FIG. 3 is a diagram illustrating an analysis of airflow within a work chamber. FIG. 2 is a diagram illustrating an analysis of airflow at equipment locations in a work room. It is a figure showing the safety cabinet of Example 2 of the present 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 describing embodiments of the present invention, a safety cabinet that was considered prior to the present invention will be described. FIG. 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 viewed from the right in the A-A' section of FIG. 1(a).

A safety cabinet casing 11 constituting the safety cabinet includes a work chamber 12 in which an operator inserts his/her hands and performs work. The front surface of the work chamber 12 is provided with an opening/closing shutter 13 that slides up and down to open and close. The opening/closing shutter 13 is made of a transparent material such as glass or hard plastic, and allows the inside of the work room to be seen. An air suction port 15 is provided on the back side of the work chamber 12 to suck in air within the work chamber. In a class 1 safety cabinet, the air inlet is generally installed on the bottom side of the back wall, but in this safety cabinet, the air inlet is placed above the bottom in the vertical direction, taking into consideration the possibility of water spray from the water source, which will be described later. It is located near the center. A pre-filter 33 is provided at the air suction port 15 so as to cover the air suction port, and the pre-filter 33 removes relatively large particles such as dust. At the back of the work chamber 12, there is provided an air passage 16 through which air sucked from the air suction port 15 flows, and at the end of the air passage 16, an air purifying filter 17 such as a HEPA filter is provided as a main filter. There is. An exhaust fan 18 and a chamber 19 are provided to create an air flow and exhaust air.

In FIG. 1(b), arrows indicate the flow of airflow. Air taken into the work chamber 12 from the lower opening of the front opening/closing shutter 13 is sucked in through the air suction port 15 on the back wall of the work chamber 12. The air is then sent to the air purifying filter 17 through the air flow path 16 and cleaned. Then, the exhaust fan 18 exhausts the air from the chamber 19 to the outside.

FIG. 2 is a perspective view showing details of the interior of the work chamber. 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 equipped with a cutting table 23 for cutting out a sample from an organ or the like. A raised table 26 is provided on the workbench surface, on which equipment such as a centrifuge 27 can be placed. 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. Furthermore, a sterilizing lamp 25 is provided above the pre-filter 33, and after using the safety cabinet, the inside of the work room can be sterilized with ultraviolet rays.

In the figure, reference numeral 28 indicates a working outlet, reference numeral 29 indicates a shutter stopper that stops the opening/closing shutter 13 at an arbitrary position, and reference numeral 31 indicates an electrical component storage section 31.

The worker works by inserting his/her hand into the work chamber 12 through the opening at the bottom of the opening/closing shutter 13. Since organs and the like containing pathogens are handled in the work room, the air in the work room is sent to the air purifying filter 17 through the air suction port 15 and the back flow path 16. Then, the air purifying filter 17 removes pathogens, 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 chamber is installed above the bottom side, approximately in the vertical center, in consideration of water splash from the water source, there is a risk of stagnation in the air flow. occurs. Furthermore, if the water faucet 21, which is a water source, comes close to the air suction port 15, there is a possibility that the pre-filter 33 will get wet, and if the pre-filter gets wet, the flow resistance will increase and the performance of the safety cabinet will not be maintained. Fear arises.

The present invention provides a safety cabinet that improves air stagnation in a work room. Moreover, when a water faucet or a sink is provided in the work room, a safety cabinet is provided that can reduce water wetting of the pre-filter.

Embodiments of the present invention will be described below with reference to the drawings. In addition, in each figure for explaining an example, the same name and code|symbol are attached to the same component, and the repeated description is abbreviate|omitted.

FIG. 3 shows an example of a safety cabinet according to the first embodiment of the present invention. FIG. 3(a) is a detailed view of the working chamber of the safety cabinet, and FIG. 3(b) is a sectional view of the working chamber seen from the right side.

As in FIG. 2, the work chamber 12 is provided with a sink 22 on the work table surface at the bottom of the work chamber, and a faucet 21 is provided above the sink. Furthermore, a sterilizing lamp 25 is provided above the pre-filter, and after using the safety cabinet, the inside of the work room can be sterilized with ultraviolet rays. Further, although not shown in the figure, the workbench surface is provided with a raised table 26, on which equipment such as a centrifuge 27 can be placed.

An air suction port 15 is provided in the back wall of the work chamber at a position above the bottom surface and close to approximately 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 with a pre-filter cover 34 . Although not shown, the pre-filter cover 34 is provided with a plurality of holes on the front surface to allow air to pass through.

The feature of this embodiment is that the pre-filter 33 is attached at an angle. That is, a rectangular plate-shaped pre-filter is attached at an angle α such that its lower part is located behind the back wall of the work chamber.

According to this embodiment, if the air suction port 15 on the back wall of the work chamber is provided above the bottom side and near the vertical center, there is a risk that stagnation will occur in the air flow. Since it is attached to the air flow path 16 at an angle so that its lower part is located behind the back wall of the work chamber, stagnation of the air flow can be improved.

FIG. 4 shows airflow in the safety cabinet studied prior to the present invention and the safety cabinet of this embodiment. FIG. 4(a) shows a safety cabinet studied prior to the present invention, and FIG. 4(b) shows a safety cabinet of this embodiment. As shown by the dotted line frame in the figure, in the safety cabinet studied prior to the present invention, the airflow is directed upward in the corner of the work room below the air suction port 15, but in the safety cabinet of this embodiment, Airflow flows smoothly toward the inclined pre-filter, improving airflow stagnation.

Figure 5 shows the results of airflow analysis at a location in the work room where no equipment is provided. 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 locations where equipment is provided in the work room for the safety cabinet studied prior to the present invention and the safety cabinet of this embodiment. FIG. 6(a) shows a safety cabinet studied prior to the present invention, and FIG. 6(b) shows a safety cabinet of this 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 stagnation of the air flow is improved.

Furthermore, according to this embodiment, the pre-filter is installed at an angle in the air flow path so that its lower part is located behind the back wall of the work chamber, which reduces water wetting of the pre-filter. can do. Water from a faucet or water splashed when a worker uses water mainly sprays downward in a fan-like pattern. In this example, the pre-filter was installed at an angle so that it was higher than the bottom of the work chamber and its lower part was behind the back wall of the work chamber, so that no water splashed onto the pre-filter. This can be reduced, and water wetting can be reduced. Further, it is possible to prevent an increase in flow path resistance of the pre-filter 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 working chamber of the safety cabinet, and FIG. 7(b) is an enlarged cross-sectional view of the vicinity of the air suction port of the working chamber, viewed from the right. Further, FIGS. 8A and 8B show a pre-filter replacement procedure.

In the second embodiment of the present invention, the prefilter can be easily replaced. In the safety cabinet studied prior to the present invention shown in FIG. 2, a pre-filter 33 is vertically attached to the back wall of the working room, and a germicidal lamp 25 is provided above the pre-filter 33. Therefore, in order to replace the pre-filter 33, it is necessary to remove the germicidal lamp 25 or 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 its lower end is located on the rear side of the air flow path 16, and is attached with a pre-filter cover 34. The pre-filter cover 34 is fixed at its upper end with a mounting screw 35 or the like, and can be tilted forward by loosening the mounting screw 35.

8A and 8B show the prefilter replacement procedure. As shown in FIG. 8A(a), loosen the mounting screws 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 (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 it with the mounting screws 35.

According to this embodiment, the pre-filter is arranged at an angle, and the pre-filter cover 34 to which the pre-filter 33 is attached is attached so that it can be tilted forward, so that the pre-filter can be easily replaced and maintainability is improved. can be improved.

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

Claims (4)

A safety cabinet that takes in air from the front of the work room, takes out the air from the back of the work room, purifies it, and discharges it to the outside,
an opening/closing shutter provided at the front of the work room;
an air suction port provided approximately at the vertical center of the back surface of the work chamber and above the bottom surface of the work chamber;
a pre-filter provided at the air intake port;
an air flow path provided on the rear side of the work chamber;
a cleaning filter that cleans the air from the air flow path;
an exhaust fan that exhausts purified air;
a water faucet installed in the work room;
a sink provided at the bottom of the work room;
Equipped with
The safety cabinet is characterized in that the pre-filter is provided at an angle at the air suction port so that a lower end is located on the rear side of the air flow path and an upper end is located on the front side. The safety cabinet according to claim 1,
The safety cabinet is characterized in that the work 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;
A safety cabinet characterized in that the pre-filter cover can be taken out by tilting it. The safety cabinet according to claim 3 ,
A safety cabinet comprising a germicidal lamp above the pre-filter.

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