JPH0547356B2 - - Google Patents

Description

[Detailed Description of the Invention] [Industrial Application Field] The present invention relates to a clean workbench that supplies clean air to a work space, and in particular to a clean workbench configured to attach and detach a filter in a direction perpendicular to the air flow direction. The present invention relates to a configuration of a filter mounting portion suitable for facilitating the attachment and detachment of a filter.

[Conventional technology]

A conventional system that connects a blower and a filter via a pressure chamber is constructed as described in Japanese Utility Model Publication No. 59-3826. When replacing the filter, the pressure chamber is pulled upwards with the blower still attached, and then the filter is removed. It was supposed to be removed. For small clean workbenches such as tabletop type, this configuration will hardly impair the workability when replacing the filter, but when applied to a large clean workbench with a vertical airflow type, it will be difficult to replace the filter. No consideration was given to workability, and the weight of the blower and pressure chamber increased, making it difficult to replace the filter.

[Problem that the invention seeks to solve]

In the above conventional technology, even if the J-type tightening bolt is loosened when removing the main filter, the pressure chamber (connection chamber) is placed on top of the main filter, so if the pressure chamber is not removed, the filter cannot be removed. I couldn't do it. Since the blower is attached to the pressure chamber, the weight of the parts is large, reaching several tens of kilograms for large models in particular, and the size of the pressure chamber is also large, making removal work difficult. Especially in the case of vertical airflow type, the filter is installed above the workbench.
There was a problem in that a space was required above in which the assembly of the blower, pressure chamber, and filter could be removed, and workability when removing the filter was poor.

The object of the present invention is to move the pressure chamber upstream when replacing the filter and hold it at a predetermined distance from the filter, thereby making it easier to attach and detach the filter.
To provide a clean workbench with excellent workability for filter replacement.

[Means for solving problems]

The above system includes a pressure chamber configured to be connected to the outlet of the blower, and a pressure chamber located downstream of the pressure chamber, with the primary side connected to the pressure chamber and the secondary side communicating with the clean air outlet. In the clean workbench, the filter is housed in a main body case, and a work space is arranged downstream of the filter, the filter is placed upstream of the clean air outlet, and the pressure chamber is The pressure chamber is formed within the main body case independently from the main body case and is configured to be held movably along the air flow direction, and during normal use, the pressure chamber is moved downstream to be brought into close contact with the filter. When the filter is attached or removed, the pressure chamber is moved upstream while leaving the filter in the same position, and the pressure chamber is moved along the airflow direction so as to form a gap having a predetermined distance between the filters. This is achieved by providing a moving means and a cover that is openable and closable in the main body case and covers the pressure chamber, the filter, and the moving means.

[Effect]

The moving means moves the pressure chamber in a direction away from the filter and holds the pressure chamber at a position where a predetermined distance is formed between the pressure chamber and the filter. This allows the filter to be replaced without taking the pressure chamber out of the device.

〔Example〕

Embodiments of the present invention will be described below with reference to FIGS. 1 to 9.

A first embodiment of the present invention is shown in FIGS. 1-5.

This embodiment is an example in which the present invention is applied to a safety cabinet.

As shown in FIGS. 1 and 2, a clean air outlet 2 is provided above the work space 4 formed inside the main body case 16, and a filter 1 is placed above the clean air outlet 2. be done. Filter 1 is part 2
The downstream side 1b communicates with the clean air outlet 2, and the primary side 1a communicates with the outlet 15a of the blower 15 via the pressure chamber 3 placed above the filter 1.
communicate with. As shown in FIG. 3, the pressure chamber 3 is formed independently from the main body case 16, and a seat plate 40 is fixed to both sides by welding or the like. The bolt 6 is fastened to a nut 8 welded to the frame 14. A seat 7 is fitted in the lower part of the neck of the screw 6 at a distance of more than the thickness of the seat plate 40 from the screw head 6a, and the seat 7 is welded.
The screw 6 is fixed by caulking or the like so that it does not fall off from the lower part of the neck. In this embodiment, the moving means 21
is composed of a screw 6, a seat 7, and a seat plate 40.

In this embodiment, as the screw 6 is tightened, the pressure chamber 3 comes into contact with and presses the primary side 1a of the filter 1, as shown in FIG. It is clamped between the frame 2a and the frame 2a.

When replacing the filter, remove the cover 17 of the main body case 16 and loosen the screws 6.
As the pressure rises, the pressure chamber 3 rises via the seat plate 40, and a gap having a predetermined distance is formed between the pressure chamber 3 and the primary side 1a of the filter 1, as shown in FIG. . In order to replace the filter, this gap should be about 10 to 30 mm, and if you stop rotating the screw 6 when the distance between the pressure chamber 3 and the filter 1 reaches this distance, the screw 6, seat 7, This distance is maintained by the seat plate 40. As a result, no pressing force is applied to the filter 1, and it can be easily taken out by pulling it out toward you. After replacing the filter, tighten the filter by reversing the procedure. According to this embodiment, since it is not necessary to take out the pressure chamber 3 and the blower 15 outside the main body case 16 when replacing the filter, less labor is required and the filter can be replaced easily even in a narrow space. In addition, since the pressure chamber 3 is provided independently from the main body case 16, there is no need for a partition to form a pressure chamber inside the main body case, and the front opening of the main body case can be made wider, allowing filter replacement. etc. can be easily maintained. In addition, in FIGS. 1 and 2, 5 is the front shutter, 9 is the working opening, and 10 is the front shutter.
11 is a front suction port for forming an air curtain, 11 is a rear suction port, 12 is an exhaust filter, 13 is a flange for connecting an exhaust duct, 17 is a main body case 16
cover, 77 is the leg, 18 is the caster for movement,
19 is an adjuster for installation, and 20 is a rectifier plate. Furthermore, according to this embodiment, the height of the main body case 16 can be reduced because the distance between the upper part of the fan 15 and the ceiling of the main body case 16 is sufficient as long as it can escape the dimension when the pressure chamber 3 rises. It is possible to reduce the size of the cleaning workbench.

A second embodiment of the present invention will be explained with reference to FIG.

In this embodiment, the portion of the pressure chamber that contacts the filter is configured to be expandable and retractable.

In this embodiment, the pressure chamber 22 is composed of an upper chamber 22a and a lower chamber 22b connected by an airtight universal joint 24. The upper chamber 22a is provided with a blower 15 on its upper surface and is fixed to the main body case 16 via a vibration isolating member 26. A universal joint 24 is provided on the lower surface of the upper chamber 22a.
The lower chamber 22b is connected via the lower chamber 22b. A seat plate 40 is fixed to the outer surface of the lower chamber 22b,
It is fastened to the frame 14 via screws 6. In this embodiment, the moving means 21 is composed of a seat plate 40, a screw 6, and a seat 7. According to this embodiment, since the moving means only holds the lower chamber 22b,
Less force is required to move the means of transportation. To replace the filter in this embodiment, remove the cover 17 (not shown) of the main body case 16 provided on the front side as viewed in FIG. This is done by forming a gap having a distance of , and pulling out the filter 1 toward the front.

A third embodiment of the present invention will be described with reference to FIG.

This embodiment is a modification of the second embodiment. The blower 15 is fixed to the main body case 16 via a vibration isolating member 26, and the discharge port 15a is connected to the flexible duct 30.
It communicates with the pressure chamber 28 via. A seat plate 40 is fixed to the outer surface of the pressure chamber 28. The pressure chamber 28 is fastened to the frame 14 by a moving means composed of a seat plate 40, a screw 6, and a seat 7. When replacing the filter, the screw 6 is rotated to move the space between the primary side 1a of the filter 1 and the pressure chamber 28. A gap having a predetermined interval is formed between the two. According to this embodiment, the force required to move the moving means is small, and a large space is created between the pressure chamber 28 and the blower 15, so that the screw 6 can be turned easily.

A fourth embodiment of the present invention will be described with reference to FIGS. 8 and 9.

In this embodiment, the moving means 31 is composed of a cam 48, a roller 58, a stud 52, a seat 7, a seat plate 40, and a lever 42 so that the pressure chamber 3 can be moved up and down by operating a lever 42. In this embodiment, a guide frame 46 having an approximately U-shaped cross section is fixed to the side surface of the filter 1 along the removal direction, and a lever 42 is rotatably supported on a shaft 44 approximately at the center of the guide frame 46. . A cam 48 is disposed at the bottom of the guide frame 46 so as to be slidable along the direction in which the filter 1 is taken out.
The movement of the lever 42 is transmitted to the cam 48 by engaging the elongated hole 48a provided approximately at the center of the cam 48 with the pin 43 implanted in the lever 42. There is a cut-and-raised section 46 approximately in the center of the bottom of the guide frame 46.
a is formed, and this cut and raise 46a and the lever 42
A spring 50 is stretched between the pin 43 and a pin 45 implanted on the opposite side with respect to the axis 44 of the pin 43. As a result, the lever 42 passes through the dead center while transitioning from the state shown in FIG. 9 to the state shown in FIG.
can be moved up and down like a snap action. A seat plate 40 is welded to the side surface of the pressure chamber 3, and a stud 52 having a head 52a is fitted into a notch 40a formed in the seat plate 40. Stud 52
A seat 7 is fixed to the lower part of the neck at a distance slightly larger than the thickness of the seat plate 40 by welding, caulking, or the like. The stud 52 is inserted through a guide 54 fixed to the frame 46, and has a roller 58 at its tip 52b.
is rotatably supported relative to the cam 48. A spring 56 is elastically fitted between the guide 54 and the tip 52b of the stud 52, and biases the stud 52 in the direction in which the pressure chamber 3 comes into contact with the filter 1.

Since this embodiment is configured as described above,
When the lever 42 is rotated counterclockwise in the figure with the pressure chamber 3 in contact with the filter 1 shown in FIG. 8, the cam 48 moves to the right, the roller 58 is pushed upward, and the seat 7 pushes up the seat plate 40, resulting in the state shown in FIG. 9, forming a gap having a predetermined distance between the pressure chamber 3 and the filter 1. In this state, replace the filter and press the lever 42.
When rotated clockwise, the cam 48 moves to the left, the roller 58 descends, and the force of the spring 56 also acts, causing the pressure chamber 3 to come into contact with and press the filter 1.

According to this embodiment, the pressure chamber can be moved up and down by lever operation, improving work efficiency when replacing the filter.

The present invention is not limited to the above-described embodiments, but may be applied to an arrangement in which the blower is separately placed outside the main body case and the discharge port of the blower and the pressure chamber are connected by a flexible duct or the like. It may also be applied to horizontal airflow types.

According to the above embodiment, since the filter can be replaced without passing through the work space, it is possible to prevent the work space from being contaminated by dust accumulated on the filter.

〔Effect of the invention〕

According to the present invention, the pressure chamber is formed within the main body case independently from the main body case, and is held movably along the airflow direction, and further provided with a moving means for moving the pressure chamber along the airflow direction, By moving the pressure chamber upstream while leaving the filter position unchanged, it is possible to easily create a gap between the filter and the pressure chamber when replacing the filter, making it easy to remove and install the filter, and to remove the cover. By opening the opening, the operation of the moving means and the handling of the filter are facilitated, and a clean workbench with excellent workability for filter replacement can be obtained.

[Brief explanation of the drawing]

1 and 2 are a front sectional view and a side sectional view, respectively, of a clean workbench according to a first embodiment of the present invention, and FIG. 3 shows a blower, a pressure chamber, and a moving means according to a first embodiment of the present invention. Perspective view, 4th
5 and 5 show the main parts of the first embodiment of the present invention, respectively, showing a state in which the pressure chamber is in contact with the filter and a state in which a gap having a predetermined distance is formed between the pressure chamber and the filter by the moving means. 6 is a front sectional view showing the main parts of the second embodiment of the present invention, FIG. 7 is a front sectional view showing the main parts of the third embodiment of the invention, Figure 8,
FIG. 9 is a side view of the main part showing a state in which the pressure chamber is in contact with the filter and a state in which a gap having a predetermined distance is formed between the pressure chamber and the filter by the moving means, respectively, in the fourth embodiment of the present invention. It is a cross section. 1... Filter, 1a... Primary side of filter, 1b
...Secondary side of filter, 2...Clean air outlet, 3,
22, 28, 32...Pressure chamber, 15...Blower, 15
a...Blower outlet, 16...Body case, 21,
31... Means of transportation.

Claims (1)

[Claims] 1 A pressure chamber configured to be connected to a discharge port of a blower, and a filter disposed downstream of the pressure chamber, whose primary side is connected to the pressure chamber and whose secondary side communicates with the clean air outlet. In a clean workbench that is housed in a main body case and has a work space downstream of the filter, the filter is placed upstream of the clean air outlet, and the pressure chamber is located inside the main body case. is formed independently from the main body case and is configured to be held movably along the air flow direction, and during normal use, the pressure chamber is moved downstream and brought into close contact with the filter. moving means for moving the pressure chamber along the air flow direction so as to move the pressure chamber in an upstream direction while leaving the filter position as it is when attaching or detaching the filter to form a gap having a predetermined distance between the filters; A clean workbench characterized by comprising a cover that is openable and closable in the main body case and covers the pressure chamber, the filter, and the moving means.