Pressure-proof inspection tool and pressure-proof inspection method for safety cabinet

Abstract

To provide a pressure-proof inspection tool and a pressure-proof inspection method for a safety cabinet, capable of facilitating mounting work of a closing plate, eliminating air leakage during pressure-proof inspection, and dispensing with waste disposal work.SOLUTION: A pressure--proof inspection jig 40 for a safety cabinet includes: a closing plate 41 disposed in a front opening portion 23 of the safety cabinet so as to close the front opening portion; and a receiving portion 50 which is provided in the front opening portion 41 and to which a surface of a peripheral edge portion of the closing plate 41 disposed in the front opening portion can be brought into close contact. In a state where the closing plate 41 closes the front opening portion 23 and the surface of the peripheral edge portion of the closing plate 41 is disposed in contact with or close to the receiving portion 50, air is supplied into the cabinet of the safety cabinet, so that the surface of the peripheral edge portion is brought into close contact with the receiving portion 50 in an airtight manner by pressure of the air.SELECTED DRAWING: Figure 7

Description

[Technical field]

[0001] The present invention relates to a pressure-resistance inspection tool and a pressure-resistance inspection method for a safety cabinet. [Background technology]

[0002] A safety cabinet forms a semi-sealed work chamber within itself except for the opening for work, and has the function of sucking in contaminated aerosols generated within the work chamber and preventing them from leaking to the workers, while also sterilizing and purifying the collected contaminated air using a HEPA filter before exhausting it. Safety cabinets are classified into Class I, II, and III depending on the level of pathogens they can handle.

[0003] One known example of such a safety cabinet is described in Patent Document 1. In such a conventional safety cabinet, as shown in Fig. 11, for example, a work chamber 2 is provided above a workbench 1, and this work chamber 2 has a work opening (front opening) 3 at the lower front part, which can be opened and closed by a shutter 4. In addition, slit-shaped intake ports 5 are provided along the front and rear edges of the workbench 1, and the air sucked in from these intake ports 5 flows through an air flow path 7 by a blower 6, a part of which is purified by an air purifier 8 such as a HEPA filter and supplied again to the work chamber 2, and the remainder is purified by an air purifier 9 such as a HEPA filter and exhausted to the outside from an exhaust port 17. Note that the flow of air (air current) is indicated by arrows in FIG. 11.

[0004] Such safety cabinets are subjected to pressure testing. This pressure testing is conducted to check the airtightness of the safety cabinet and to ensure that there is no risk of contaminated air leaking out of the cabinet when it is actually used. The inside of the cabinet is pressurized to over 500 Pa, and a leakage test liquid (such as soapy water) is sprayed onto the joints of the cabinet's outer casing and the wiring penetrations to check for bubbles caused by air leakage. In such pressure resistance tests, when the inside of the cabinet (work chamber) is pressurized to 500 Pa or more, the front opening needs to be sealed with a rectangular closing plate.

[0005] As shown in FIG. 12, in the past, when sealing the front opening 11 of a safety cabinet 10 with a cover plate 12, the cover plate 12 was placed so as to cover the front opening 11, and pressure bars 13, 13 were placed horizontally on the surface of the cover plate 12, and both ends of the pressure bars 13 were tied to the safety cabinet 10 with fastening bands 14 such as PP bands, thereby pressing the cover plate 12 against the front opening 11 of the safety cabinet 10. Furthermore, adhesive tape 15 such as packing tape was attached in about three layers around the periphery of the cover plate 12 and the front of the safety cabinet 10, and the periphery of the cover plate 12 was sealed with the adhesive tape 15, thereby preventing air leakage due to pressurization inside the cabinet. [Prior art documents] [Patent documents]

[0006] [Patent Document 1] JP 2003-130412 A Summary of the Invention [Problem to be solved by the invention]

[0007] However, the installation work of the blocking plate 12 as described above is very time-consuming. First, it is difficult for a single worker to fasten both ends of the pressure bar 13 to the safety cabinet 10 with the fastening bands 14 such as PP bands. In addition, the task of applying adhesive tape 15 to the periphery of the cover plate 12 and the front surface of the safety cabinet 10 to seal the periphery is time-consuming and requires two workers to complete the task in about 10 minutes. Furthermore, air leakage often occurs due to pressurization inside the cabinet during pressure resistance testing, in which case additional sealing work with adhesive tape 15 is required. In addition, after the pressure resistance test, the fastening bands 14 and the adhesive tape 15 become a large amount of waste and must be discarded.

[0008] The present invention has been made in consideration of the above-mentioned circumstances, and has an object to provide a pressure-resistance inspection tool and a pressure-resistance inspection method for a safety cabinet that allows easy installation of a cover plate, prevents air leakage during a pressure-resistance inspection, and eliminates the need for waste disposal. [Means for solving the problem]

[0009] In order to achieve the above object, the pressure resistance inspection tool for a safety cabinet of the present invention comprises: A cover plate is disposed on a front opening of the safety cabinet so as to cover the front opening; a receiving portion provided in the front opening and capable of being in close contact with a peripheral surface of the closing plate disposed in the front opening; The blocking plate blocks the front opening and is positioned with the surface of the peripheral portion abutting or close to the receiving portion, and supplies air to the inside of the safety cabinet, so that the pressure of the air causes the surface of the peripheral portion to airtightly adhere to the receiving portion.

[0010] The pressure resistance inspection method of the safety cabinet of the present invention includes the steps of: A cover plate is placed on a front opening of the safety cabinet with a peripheral surface of the cover plate abutting or adjacent to a receiving portion provided on the front opening, Next, air is supplied into the interior of the safety cabinet, and the pressure of the supplied air causes the surface of the peripheral portion to airtightly adhere to the receiving portion, thereby maintaining the pressure inside the cabinet at or above a predetermined value.

[0011] In the present invention, the pressure resistance testing tool for a safety cabinet comprises a blocking plate that blocks the front opening and a receiving portion provided on the front opening. When performing a pressure resistance test, the blocking plate is placed on the front opening with the peripheral surface of the blocking plate abutting or close to the receiving portion, and then air is supplied into the inside of the cabinet. The pressure of the supplied air hermetically seals the peripheral surface of the blocking plate against the receiving portion, thereby maintaining the pressure inside the cabinet at or above a predetermined value. Therefore, unlike the conventional technique, the presser bar, fastening band and adhesive tape are no longer necessary, which facilitates the installation of the closing plate. In addition, the air pressure hermetically seals the peripheral surface of the covering plate against the receiving part; in other words, the air pressure inside the cabinet is used to convert the air pressure, which previously had the risk of air leakage, into a sealing force, so there is no air leakage during pressure resistance testing and there is no need for additional sealing work with adhesive tape. Furthermore, since the fastening band and adhesive tape are no longer necessary, no waste is generated and disposal work is no longer necessary.

[0012] In addition, in the above-mentioned configuration of the present invention, the receiving portion may have a horizontal receiving portion integrally provided along the horizontal edge portion of the front opening, and a vertical receiving portion attached along the vertical edge portion of the front opening. In this case, the cover plate is inserted into the cabinet from the front opening, Next, the vertical receiving portion is attached to the vertical edge portion of the opening, Next, a cover plate is placed on the front opening, and the surface of the horizontal edge portion of the cover plate is placed in contact with or adjacent to the horizontal support portion, and the surface of the vertical edge portion of the cover plate is placed in contact with or adjacent to the vertical support portion; Next, air is supplied into the cabinet, and the pressure of the supplied air causes the surfaces of the horizontal and vertical edge portions of the closing plate to airtightly contact the horizontal and vertical receiving portions.

[0013] According to this configuration, when placing the cover plate, which has been inserted into the cabinet through the front opening, in the front opening, the vertical support parts are attached to the vertical edges of the front opening, the cover plate is then placed in the front opening, and the surfaces of the horizontal edges of the cover plate are placed in contact with or close to the horizontal support parts, and the surfaces of the vertical edges of the cover plate are placed in contact with or close to the vertical support parts, so that the cover plate can be easily placed in the front opening. Then, air is supplied into the cabinet, and the pressure of the supplied air causes the surfaces of the horizontal and vertical edges of the cover plate to airtightly adhere to the horizontal and vertical support parts, so that a pressure test can be performed reliably without air leakage.

[0014] In the above-described configuration of the present invention, the closing plate may include a temporary fastening member for temporarily fastening the closing plate to the vertical receiving portion. In this case, the surface of the horizontal edge portion of the blocking plate is placed in contact with or close to the horizontal support portion, and when the surface of the vertical edge portion of the blocking plate is placed in contact with or close to the vertical support portion, the blocking plate is temporarily fixed to the vertical support portion by a temporary fixing member.

[0015] With this configuration, when the surface of the horizontal edge of the cover plate is placed in contact with or close to the horizontal receiving portion, and the surface of the vertical edge of the cover plate is placed in contact with or close to the vertical receiving portion, the cover plate is temporarily fixed to the vertical receiving portion by the temporary fixing member, so that the air pressure supplied inside the cabinet allows the cover plate to be positioned at a predetermined position in the front opening before the surfaces of the horizontal and vertical edges of the cover plate are airtightly sealed to the horizontal and vertical receiving portions.

[0016] In the above-described configuration of the present invention, the blocking plate may include a connection portion to which a supply pipe for supplying air to the inside of the cabinet is connected. In this case, when air is to be supplied to the inside of the cabinet, the supply pipe is connected to the connection part.

[0017] According to this configuration, when performing a pressure resistance test, the supply pipe is connected to the connection part, and air can be easily supplied into the cabinet through the supply pipe and the connection part. Effect of the Invention

[0018] According to the present invention, the work of attaching the blocking plate is easy, there is no air leakage during pressure resistance testing, and furthermore, the work of disposing of waste is not required. [Brief description of the drawings]

[0019] [Figure 1] FIG. 1 is a front view showing an example of a safety cabinet for performing a pressure resistance test according to an embodiment of the present invention. [Diagram 2] 2 is a cross-sectional view taken along line AA in FIG. [Diagram 3] 2 is a cross-sectional view taken along line BB in FIG. [Figure 4] FIG. 2 is a front view showing a closing plate of the pressure resistance inspection jig according to the embodiment of the present invention. [Diagram 5] 5 is a cross-sectional view taken along line AA in FIG. 4. [Figure 6] 1A, 1B, and 1C are diagrams showing a vertical receiving portion of a pressure resistance inspection jig according to an embodiment of the present invention, in which FIG. [Figure 7] 1A shows a safety cabinet equipped with a pressure resistance inspection jig according to an embodiment of the present invention, where (a) is a cross-sectional view, (b) is an enlarged view of the b-circle portion in (a), and (c) is an enlarged view of the c-edge portion in (a). [Figure 8] FIG. 2 is a front view of a main part showing a state in which a pressure resistance inspection jig according to an embodiment of the present invention is attached. [Figure 9] 8 as seen along the line BB in FIG. [Figure 10] FIG. 9 is an enlarged view of edge D in FIG. 8 according to the first embodiment. [Figure 11] FIG. 1 is a cross-sectional view showing an example of a conventional safety cabinet. [Figure 12] FIG. 1 is a schematic perspective view of a safety cabinet for explaining a conventional pressure resistance testing method for a safety cabinet. DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS

[0020] DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS Hereinafter, embodiments of a pressure-resistance inspection tool and a pressure-resistance inspection method for a safety cabinet according to the present invention will be described with reference to the drawings. First, before describing the pressure-resistance inspection jig and pressure-resistance inspection method for a safety cabinet according to the present embodiment, the safety cabinet will be described.

[0021] Fig. 1 to Fig. 3 show an example of a safety cabinet, in which Fig. 1 is a front view, Fig. 2 is a cross-sectional view taken along line AA in Fig. 1, and Fig. 3 is a cross-sectional view taken along line BB in Fig. 1. The safety cabinet 20 shown in Figs. 1 to 3 is subjected to a pressure-resistance test using a pressure-resistance test jig for a safety cabinet according to this embodiment.

[0022] The safety cabinet 20 comprises a hollow cabinet body 21, and a work chamber 22 is provided inside this cabinet body 21 (inside the cabinet). The cabinet body 21 has a front opening 23 on the front side, which serves as an opening for work. The front opening 23 is formed in a rectangular shape, and can be opened and closed by a shutter 24 that is provided so as to be slidable up and down. The shutter 24 is provided on shutter rails 27, 27 (see FIG. 3) provided on both the left and right edges of the front opening 23 so as to be slidable up and down. The work chamber 22 is a work space into which a worker can insert his or her hands from a front opening 23 to work, and is provided above a work table 22a.

[0023] In addition, slit-shaped intake ports 25 are provided along the front and rear edges of the workbench 22a, and the air sucked in from these intake ports 25 circulates through an air flow path 29 by a blower 28, and a portion of the air is purified by an air purification section 29a such as a HEPA filter and supplied again to the work chamber 22, while the remainder is purified by an air purification section 29b such as a HEPA filter and exhausted to the outside through an exhaust port (not shown).

[0024] The safety cabinet 20 also has a front cover 30 on the front side. A control panel 31 is provided at the upper front part of the cabinet body 21, and an illumination lamp 32 is provided above the entrance to the work chamber 22. The control panel 31 and the illumination lamp 32 are covered by the front cover 30, but the front opening 23 is not covered. Both left and right edges of the front opening 23, i.e., the areas where the shutter rails 27, 27 are provided, are covered by the front cover 30 together with the shutter rails 27, 27. A germicidal lamp 33 is provided at the upper part of the wall on the far side of the work chamber 22.

[0025] The safety cabinet 20 is provided with four casters 34 at its bottom, and can be moved by the casters 34. Also, legs 35 are provided at the bottom of the safety cabinet 20 adjacent to each caster 34, and by extending the legs 35 and lifting the casters 34, the safety cabinet 20 can be installed at a desired position.

[0026] The safety cabinet 20 configured as described above uses the pressure test fixture 40 according to this embodiment when conducting a pressure test. As described above, in the pressure test, the inside of the cabinet is pressurized to 500 Pa or more. The inside of the cabinet means the entire internal space of the cabinet body 21 including the working chamber 22.

[0027] The pressure resistance inspection jig 40 includes a closing plate 41 as shown in Figures 4 and 5. The closing plate 41 includes a closing plate body 42 formed in a rectangular plate shape, a connection part 43 provided in the center of the lower end part of the closing plate body 42, and temporary fixing members 44 provided at each of the four corners on the front side of the closing plate body 42.

[0028] The blocking plate body 42 is formed of a rectangular aluminum plate, and among the four peripheral edges of the aluminum plate, the upper edge and both left and right edges are bent at approximately right angles to the rear side to form an L-shaped cross section. In addition, the lower edge of the aluminum plate is bent diagonally to the rear side to form an L-shaped cross section. Packing material 45 is provided on each of the four sides of the surface of the blocking plate main body 42. The packing material 45 is arranged in a rectangular frame shape. Moreover, the packing material 45 provided on the lower side of the blocking plate main body 42 is provided at an angle to the back side of the blocking plate main body 42 along the lower edge of the aluminum plate bent into a L-shape.

[0029] The connecting part 43 is connected to a supply pipe 60 (see FIG. 7(a)) for supplying air to the inside of the cabinet, and is formed in a cylindrical shape. A mounting hole for mounting the connecting part 43 is formed in the center of the lower end of the closing plate main body 42, and the base end of the connecting part 43 is inserted into this mounting hole, and a flange provided at the base end is fixed to the back surface of the closing plate main body 42. In this state, the connecting part 43 protrudes from the surface of the closing plate main body 42 at approximately a right angle. A reinforcing member 46 extending along the long side is fixed to the center of the short side of the closing plate body 42. The reinforcing member 46 is also used as a handle when an operator handles the closing plate 41.

[0030] The temporary fastening member 44 is used when temporarily fastening the closing plate 41 to the front opening 23 (a vertical receiving portion 52 provided in the front opening 23, described later) of the safety cabinet 20, and is formed of a strip-shaped double-sided male hook-and-loop fastener. The temporary fastening member 44 is disposed along the long side direction of the closing plate main body 42, and its base end portion 44a is fixed to the surface of the closing plate main body 42. The tip portion of the temporary fastening member 44 is temporarily fastened to a female hook-and-loop fastener 47 fixed to the surface of the closing plate main body 44. The temporary fastening member 44 is used by removing the tip portion from the hook-and-loop fastener 47 when temporarily fastening the closing plate 41 to the vertical receiving portion 52 of the front opening 23. The closing plate 41 having such a configuration weighs, for example, about 3.6 kg, which is about half the weight of a conventional closing plate.

[0031] In addition to the closing plate 41, the pressure resistance inspection jig 40 is provided with a receiving portion 50 to which the peripheral surface of the closing plate 41 can come into close contact. The receiving portion 50 has a horizontal receiving portion 51 and a vertical receiving portion 52. The lateral support parts 51 are provided integrally with the cabinet body 21 at the upper and lower opening lateral edges 23a, 23a of the front opening 23 of the cabinet body 21, as shown in Fig. 7. The lateral support part 51 provided at the upper opening lateral edge 23a is formed in an L-shaped cross section as shown in Fig. 7(b), one side of which is fixed to the cabinet body 21 at the opening lateral edge 23a, and the other side of which is located at the opening lateral edge 23a. The lateral support part 51 provided at the lower opening lateral edge 23a is formed to be inclined obliquely downward toward the work chamber 22, as shown in Fig. 7(c), and its upper end part is connected to the cabinet body 21 at the opening lateral edge 23a.

[0032] When placing the closing plate 41 at the front opening 23 of the cabinet body 21 during a pressure resistance test, the closing plate 41 is placed slightly closer to the work chamber 22 than the front opening 23, and the surfaces of the upper and lower lateral edges (upper and lower edges) of the closing plate 41 are placed in contact with or close to the lateral support portions 51. At that time, the upper and lower packing materials 45, 45 of the closing plate 41 are in contact with or close to the lateral support portions 51, 51.

[0033] The vertical support portion 52 is attached along the left and right vertical opening edges 23b, 23b of the front opening 23 of the safety cabinet 20 during pressure testing, as shown in Figure 9, and is configured as follows. That is, as shown in FIG. 6, the vertical receiving portion 52 has a vertical receiving portion main body 53, a packing material 54, a fastening material 55, and a temporary fastening portion 56.

[0034] The vertical support body 53 is made of stainless steel and is formed in a vertically long strip shape, with one edge (the left edge in FIG. 6(a)) along the vertical direction being bent at a substantially right angle to the back side. The vertical length of the vertical support body 53 is substantially equal to the length of the opening vertical edge 23b along the vertical direction of the front opening 23.

[0035] The packing material 54 is provided on the back surface of the vertical receiving part main body 53, over the entire back surface. The fastening material 55 is a member for fastening and fixing the vertical receiving part 52 to the opening vertical edge part 23b of the front opening part 23 of the safety cabinet 20, and is configured by a thumbscrew in this embodiment. One end of a fall-off prevention wire 57 is connected to the fastening material 55, and the other end of the fall-off prevention wire 57 is fixed to the vertical receiving part main body 53 by a bolt 58. Therefore, the fastening material 55 is connected to the vertical receiving part main body 53 by the fall-off prevention wire 57, thereby preventing the fastening material 55 from falling off from the vertical receiving part main body 53.

[0036] Three through holes 53a are formed at a predetermined interval in the longitudinal direction of the vertical receiving part body 53 at one edge (the left edge in FIG. 6(a)) of the vertical receiving part body 53, which are used when screwing and fixing the vertical receiving part 52 to the opening vertical edge part 23b (the shutter rail 27 provided on the opening vertical edge part 23b) of the front opening part 23 of the safety cabinet 20. The through holes 53a are also arranged at a predetermined interval in the lateral direction of the vertical receiving part body 53 with respect to the bolts 58. To fix the vertical receiving portion 52 to the opening vertical edge portion 23b, a screw hole is formed coaxially with the through hole 53a in the shutter rail 27 provided on the opening vertical edge portion 23b, and the fastening material 55 is screwed into the screw hole through the through hole 53a.

[0037] The temporary fastening portion 56 is formed of a strip-shaped female hook-and-loop fastener, and is provided along an edge portion along the longitudinal direction (the right edge portion in FIG. 6(a)) on the surface of the vertical receiving portion main body 53. The temporary fastening portion 56 is adapted to temporarily fasten the closing plate 41 to the opening vertical edge portion 23b of the front opening 23 of the safety cabinet 20 by engaging with the temporary fastening member 44 provided on the closing plate 41.

[0038] There are a pair of vertical receiving portions 52 having such a configuration, one on the left and one on the right, and the vertical receiving portion 52 shown in Fig. 6 is attached to the left opening vertical edge portion 23b of the front opening 23. The vertical receiving portion 52 attached to the right opening vertical edge portion 23b is formed symmetrically with the vertical receiving portion 52 attached to the left opening vertical edge portion 23b.

[0039] When temporarily fixing the blocking plate 41 to the opening vertical edge portions 23b, 23b of the front opening 23 of the safety cabinet 20, the blocking plate 41 is placed at the front opening 23, and the tip portion of the temporary fixing member 44 provided on the blocking plate 41 is removed from the hook-and-loop fastener 47 and engaged with the temporary fixing portions 56, 56 provided on the vertical receiving portions 52, 52, as shown in Figures 8 to 10.

[0040] Next, the pressure resistance test method for the safety cabinet will be explained. First, the front cover 30 is removed from the safety cabinet 20 shown in Figures 1 to 3, and the shutter 24 is also removed. As a result, the front side of the safety cabinet 20 is exposed as shown in Figure 7, and therefore the shutter rails 27, 27 (see Figure 3) are also exposed.

[0041] Next, the closing plate 41 is placed into the working chamber 22 of the cabinet main body 21 through the front opening 23. In this case, the worker holds the reinforcing member 46 of the closing plate 41 as a handle and places the closing plate 41 into the working chamber 22. 8, the vertical receiving portions 52, 52 are attached to the left and right opening vertical edge portions 23b, 23b of the front opening 23. In this case, the fastening material 55 is inserted into the through hole 53a formed in the vertical receiving portion 52 and screwed into a screw hole (not shown) formed in the shutter rail 27, thereby fixing the vertical receiving portion 52 to the shutter rail 27.

[0042] Next, the worker grasps the reinforcing members 46 of the blocking plate 41 as handles and places it in the front opening 23, while placing the side edges (upper and lower edges) of the blocking plate 41 against or close to the side support portions 51, 51. At this time, the packing material 45 provided on the upper edge portion (upper side edge portion) of the blocking plate 41 abuts against the side support portion 51, as shown in Fig. 7(b), and the packing material 45 provided on the lower edge portion (lower side edge portion) of the blocking plate 41 abuts against the side support portion 51, as shown in Fig. 7(c). 9 and 10, both vertical edge portions of the closing plate 41 are placed in contact with or close to the vertical receiving portions 52, 52. At this time, the packing material 54 of the vertical receiving portions 52 is in contact with or close to the packing material 45 provided on the surfaces of the vertical edge portions of the closing plate 41.

[0043] In this way, when the surface of the horizontal edge of the blocking plate 41 is placed in contact with or close to the horizontal support portion 51, and the surface of the vertical edge of the blocking plate 41 is placed in contact with or close to the vertical support portion 52, the blocking plate 41 is temporarily fixed to the vertical support portion 52 by the temporary fixing member 44. This temporary fixing is performed by removing the tip of the temporary fixing member 44 from the hook-and-loop fastener 47 and engaging it with the temporary fixing portion 56 provided on the vertical receiving portion 52. In this way, the closing plate 41 is temporarily fixed to the front opening 23.

[0044] Next, air is supplied into the inside of the cabinet body 21, but before this supply, the upper exhaust port (not shown) provided at the top of the cabinet body 21 is blocked. Since the shape of the exhaust port varies depending on the model and option settings of the safety cabinet 20, in some cases a metal lid is attached to this exhaust port, and in other cases a vinyl sheet is attached. When supplying air to the inside of the cabinet body 21, as shown in FIG. 7(a), a supply pipe 60 for supplying air is connected to a connection part 43 provided on the blocking plate 41, and air is supplied from this supply pipe 60 to the inside of the cabinet body 21 via the connection part 43.

[0045] Then, the pressure of the supplied air presses the blocking plate 41 outward, so that the surfaces of the horizontal and vertical edges of the blocking plate 41 airtightly adhere to the horizontal receiving portion 51 and the vertical receiving portion 52. That is, as shown in Fig. 7(b), the packing material 45 provided on the upper horizontal edge of the blocking plate 41 adheres to the horizontal receiving portion 51, and as shown in Fig. 7(c), the packing material 45 provided on the lower horizontal edge of the blocking plate 41 adheres to the horizontal receiving portion 51. 10, the packing material 45 provided on the vertical edge portion of the closing plate 41 is in close contact with the packing material 54 provided on the vertical receiving portion 52. This maintains the internal pressure of the cabinet body 21 at a predetermined value (500 Pa) or higher. In this state, a leakage inspection liquid (such as soapy water) is sprayed onto the joints and wiring penetrations of the outer casing of the safety cabinet 20 to check for bubbles caused by air leakage.

[0046] As described above, according to this embodiment, the pressure resistance testing jig 40 of the safety cabinet 20 comprises a blocking plate 41 that blocks the front opening 23 and a receiving portion 50 provided on the front opening 23. When performing a pressure resistance test, the blocking plate 41 is placed at the front opening 23 with the peripheral surface of the blocking plate 41 abutting or close to the receiving portion 50, and then air is supplied into the inside of the cabinet. The pressure of the supplied air causes the peripheral surface of the blocking plate 41 to be airtightly adhered to the receiving portion 50, thereby maintaining the pressure inside the cabinet at or above a predetermined value. Therefore, unlike the conventional technique, the presser bar, fastening band and adhesive tape are no longer necessary, which facilitates the installation of the closing plate. Previously, a pressure test required two workers, 10 minutes each, for a total of 20 minutes, but with this new system, it can be reduced to just one worker and about three minutes.

[0047] In addition, the air pressure causes the peripheral surface of the closing plate 41 to airtightly adhere to the receiving portion 50; in other words, the air pressure inside the cabinet is utilized to convert the air pressure, which previously had the risk of air leakage, into a sealing force, so there is no air leakage during pressure resistance testing and there is no need for additional sealing work with adhesive tape. Furthermore, since the fastening band and adhesive tape are no longer necessary, no waste is generated and disposal work is no longer necessary.

[0048] In addition, since the receiving portion 50 has a horizontal receiving portion 51 which is integrally formed along the opening horizontal edge 23a of the front opening 23, and a vertical receiving portion 52 which is attached along the opening vertical edge 23b of the front opening 23, when placing the blocking plate 41 which has been inserted into the cabinet through the front opening 23 in the front opening 23, the vertical receiving portion 52 is attached to the opening vertical edge 23b of the front opening 23, and then the blocking plate 41 is placed in the front opening 23, and the surface of the horizontal edge of the blocking plate 41 is placed in contact with or close to the horizontal receiving portion 51, and the surface of the vertical edge of the blocking plate 41 is placed in contact with or close to the vertical receiving portion 52, thereby making it possible to easily place the blocking plate 41 in the front opening 23. Thereafter, air is supplied into the cabinet, and the pressure of the supplied air causes the surfaces of the horizontal and vertical edges of the blocking plate 41 to airtightly adhere to the horizontal and vertical receiving portions 51 and 52, thereby enabling a pressure resistance test to be performed reliably without air leakage.

[0049] Furthermore, the blocking plate 41 is provided with a temporary fastening member 44 that temporarily fastens the blocking plate 41 to the vertical receiving portion 52. Therefore, when the surface of the horizontal edge portion of the blocking plate 41 is placed in contact with or close to the horizontal receiving portion 51 and the surface of the vertical edge portion of the blocking plate 41 is placed in contact with or close to the vertical receiving portion 52, the blocking plate 41 is temporarily fastened to the vertical receiving portion 52 by the temporary fastening member 44. Therefore, the blocking plate 41 can be positioned at a predetermined position in the front opening 23 before the surfaces of the horizontal and vertical edges of the blocking plate 41 are airtightly sealed to the horizontal receiving portion 51 and the vertical receiving portion 52 by the air pressure supplied inside the cabinet.

[0050] In addition, since the blocking plate 41 is provided with a connection part 43 to which a supply pipe 60 for supplying air to the inside of the cabinet is connected, when performing a pressure resistance test, the supply pipe 60 is connected to the connection part 43, and air can be easily supplied to the inside of the cabinet through the supply pipe 60 and the connection part 43. [Explanation of symbols]

[0051] 20. Safety Cabinet 21 Cabinet body 23 Front opening 23a Opening side edge 23b Opening vertical edge 40 Pressure Testing Jig 41 Closing plate 43 Connection 44 Temporary fastening member 50 Receiving part 51 Side support part 52 Vertical support 60 Supply pipe

Claims

1. A pressure resistance inspection tool for a safety cabinet, A cover plate disposed at a front opening of the safety cabinet so as to cover the front opening; a receiving portion provided in the front opening and capable of being in close contact with a peripheral surface of the closing plate disposed in the front opening; A pressure resistance inspection jig for a safety cabinet, characterized in that the blocking plate blocks the front opening and is positioned with the surface of the peripheral portion abutting or close to the receiving portion, and air is supplied into the inside of the safety cabinet, and the pressure of the air causes the surface of the peripheral portion to airtightly adhere to the receiving portion.

2. 2. The pressure resistance inspection jig for a safety cabinet as described in claim 1, characterized in that the receiving portion has a horizontal receiving portion integrally provided along a horizontal edge portion of the front opening, and a vertical receiving portion attached along a vertical edge portion of the front opening.

3. 3. The pressure resistance inspection tool for a safety cabinet according to claim 2, wherein the closing plate is provided with a temporary fastening member for temporarily fastening the closing plate to the vertical receiving portion.

4. 4. A pressure resistance inspection jig for a safety cabinet as described in any one of claims 1 to 3, characterized in that the blocking plate has a connection portion to which a supply pipe for supplying air to the inside of the cabinet is connected.

5. A pressure resistance testing method for a safety cabinet, comprising the steps of: A cover plate is placed on a front opening of the safety cabinet with a peripheral surface of the cover plate abutting or being close to a receiving portion provided on the front opening; Next, air is supplied into the inside of the safety cabinet, and the pressure of the supplied air causes the surface of the peripheral portion to airtightly adhere to the receiving portion, thereby maintaining the pressure inside the cabinet at or above a predetermined value.

6. The receiving portion has a horizontal receiving portion integrally provided along a horizontal edge of the front opening, and a vertical receiving portion attached along a vertical edge of the front opening, First, the cover plate is inserted into the cabinet through the front opening, Next, the vertical receiving portion is attached to the vertical edge portion of the opening, Next, a cover plate is placed on the front opening, and the surface of the horizontal edge portion of the cover plate is placed in contact with or adjacent to the horizontal support portion, and the surface of the vertical edge portion of the cover plate is placed in contact with or adjacent to the vertical support portion; A pressure resistance inspection method for a safety cabinet as described in claim 5, characterized in that air is then supplied into the inside of the cabinet, and the pressure of the supplied air causes the surfaces of the horizontal and vertical edge portions of the cover plate to be airtightly attached to the horizontal and vertical support portions.

7. The closing plate includes a temporary fastening member that temporarily fastens the closing plate to the vertical receiving portion, A pressure resistance inspection method for a safety cabinet as described in claim 6, characterized in that when the surface of the horizontal edge portion of the cover plate is abutted against or placed close to the horizontal support portion, and the surface of the vertical edge portion of the cover plate is abutted against or placed close to the vertical support portion, the cover plate is temporarily fixed to the vertical support portion by the temporary fixing member.

8. the closing plate includes a connection portion to which a supply pipe for supplying air to the inside of the cabinet is connected, The pressure resistance inspection method for a safety cabinet according to any one of claims 5 to 7, characterized in that, when air is supplied to the inside of the cabinet, the supply pipe is connected to the connection part.

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