Fume hood

Abstract

To provide a fume hood capable of performing efficient exhaust in which air staying or turbulence hardly occur in a work space.SOLUTION: A fume hood 1 comprises: a workbench 10; a hood body 20 having a left side wall 21, a right side wall 22, a rear wall 23, and an upper wall 24; and exhaust means 30 for exhausting air in the hood 20 to the outside. The hood body 20 is disposed so as to cover the work surface W of the workbench 10. A left oblique wall 41 intersecting the left and rear walls 21 and 23 is provided. A right oblique wall 42 intersecting the right and rear walls 22 and 23 is provided.SELECTED DRAWING: Figure 1

Description

[Technical field]

[0001] The present invention relates to a fume hood (also called a draft chamber) used when conducting chemical experiments in laboratories, research laboratories, and the like. [Background technology]

[0002] In laboratories and research laboratories, it is common to use fume hoods to conduct experiments such as chemical reactions, heat treatments, decomposition, and extraction using chemicals.

[0003] A fume hood is a device that encloses the experimental space (work space) on a work table from outside air so that the chemical environment in a laboratory is not damaged by polluting gases such as harmful gases and foul-smelling gases generated during an experiment, and by extension, so that the health and safety of experimenters is not harmed. Generally, it is equipped with an intake-type hood body (chamber body) whose internal space is used as a work space for experiments, and a vertical sliding door is provided at the front opening of the hood body. By opening this door to allow an operator to insert his or her hand into the hood body, the air inside the hood body is sucked and exhausted through the exhaust duct at the top end of the hood body, allowing outside air to flow into the hood body from the front opening, preventing the polluting gases inside the hood body from dissipating into the laboratory from the front opening. [Prior art documents] [Patent documents]

[0004] [Patent Document 1] Patent Publication 2009-202155 [Patent Document 2] Application Publication No. 5-28426 Summary of the Invention [Problem to be solved by the invention]

[0005] However, in the conventional fume hoods shown in Patent Documents 1 and 2, the corner formed by the left or right wall of the hood body and the rear wall is a right angle, so the air in the work space has difficulty flowing into the corner, and tends to stagnate or form turbulent air in the corner. This makes it difficult for the air in the work space to be exhausted, and there is a problem that it cannot be exhausted efficiently.

[0006] The present invention has been made in consideration of the above problems, and has an object to provide a fume hood that is capable of efficiently exhausting air in a work space without causing stagnation or turbulence to form. [Means for solving the problem]

[0007] In order to solve the above problems, the present invention comprises the following means.

[0008] [1] A workbench; a hood body having a left side wall, a right side wall, a rear wall, and an upper wall; and an exhaust means for exhausting air inside the hood body to the outside, The hood body is a fume hood arranged to cover the work surface of the workbench, A fume hood characterized in that a left inclined wall is provided intersecting the left side wall and the rear wall, and a right inclined wall is provided intersecting the right side wall and the rear wall.

[0009] [2] The left inclined wall is provided so as to hide a left corner portion formed by the left side wall and the rear wall, and the right inclined wall is provided so as to hide a right corner portion formed by the right side wall and the rear wall, 2. A fume hood as described in the preceding paragraph 1, in which experimental equipment used for work is placed in at least one of the left space formed by the left inclined wall and the left corner portion, and the right space formed by the right inclined wall and the right corner portion.

[0010] [3] The fume hood according to paragraph 2, wherein the experimental equipment is a sink.

[0011] [4] A fume hood as described in paragraph 2 or 3 above, wherein the experimental equipment is gas piping. Effect of the Invention

[0012] According to the fume hood of the invention [1], a left inclined wall intersecting the left side wall and the rear wall is provided, and a right inclined wall intersecting the right side wall and the rear wall is provided, so that the angles between the left side wall and the rear wall and the inner surface of the left inclined wall, and the angles between the right side wall and the rear wall and the inner surface of the right inclined wall are greater than 90 degrees, and the air in the working space can easily flow smoothly along the left side wall, the left inclined wall, and the rear wall, or along the right side wall, the right inclined wall, and the rear wall. Therefore, the air in the working space is less likely to stagnate or to form turbulence, and can be exhausted efficiently.

[0013] According to the fume hood of invention [2], the experimental equipment used in the work is placed in at least one of the left space formed by the left inclined wall and the left corner, and the right space formed by the right inclined wall and the right corner. Therefore, compared to a case in which the experimental equipment is placed within the work space, a larger work space can be ensured, thereby improving work efficiency.

[0014] According to the fume hood of the invention [3], since the experimental equipment is a sink, workers can use water while working while maintaining a large working space.

[0015] According to the fume hood of invention [4], the experimental equipment is gas piping, so that the worker can supply the necessary gas into the working space while ensuring the spaciousness of the working space. [Brief description of the drawings]

[0016] [Figure 1] FIG. 1 is a front view of one embodiment of the fume hood of the present invention. [Diagram 2] 2(A) is a top view of the fume hood in FIG. 1, and FIG. 2(B) is a right side view of the fume hood in FIG. [Diagram 3] FIG. 3 is a cross-sectional view taken along line XX in FIG. [Figure 4] Figure 4 is a cross-sectional view taken along line YY in Figure 1, where Figure (A) is a cross-sectional view when the front door is fully closed, Figure (B) is a cross-sectional view showing only the front of the fume hood when the front door is half-closed, and Figure (C) is a cross-sectional view showing only the front of the fume hood when the front door is fully open. [Diagram 5] FIG. 5 is a schematic diagram showing an air flow when the fume hood of FIG. 1 is used, taken along the line XX in FIG. [Figure 6] FIG. 6 is a schematic diagram showing an air flow in a case where the fume hood of FIG. 1 is used with the front door half-open, taken along the line YY in FIG. DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS

[0017] An embodiment of the fume hood of the present invention will be described with reference to Figures 1 to 6. In the following description, with regard to directions in the fume hood 1 of this embodiment, the near side in Figure 1 will be referred to as the front direction, the opposite side will be referred to as the rear direction, the right and left sides in Figure 1 will be referred to as the right direction and the left direction, and the upper and lower sides in Figure 1 will be referred to as the upper direction and the lower direction.

[0018] The fume hood 1 of this embodiment is used when conducting experiments in a laboratory, a research lab, etc. The fume hood 1 of this embodiment includes a workbench 10, a hood body 20, and an exhaust means 30.

[0019] The workbench 10 of this embodiment is where an operator performs work such as experiments and research.

[0020] As shown in Figures 1 and 2(B), the workbench 10 of this embodiment is composed of a base 11, a top plate 12 and legs 14, has a space 15 between the base 11 and the top plate 12, and is supported by the legs 14.

[0021] As shown in Fig. 3, the top surface of the tabletop 12 is a work surface W, which is a chemsurf surface that has high chemical resistance and is ideal for experiments using a variety of chemicals. An operator performs experiments, research, and other tasks on the work surface W.

[0022] The outer peripheral edge of the top plate 12 is made of a punched panel having a large number of circular holes 12 a formed therein, and these circular holes 12 a communicate with the space 15 .

[0023] In this embodiment, the base 11 is a foundation for the top plate 12 and forms a space 15 together with the top plate 12, and the legs 14 support the base 11 and the top plate 12. Furthermore, the space 15 is where air from a working space A described below flows in through the circular hole 12a.

[0024] As shown in FIG. 1, a water valve 16a, a low vacuum valve 16b, a nitrogen valve 16c, an air supply fan switch 17a, a light switch 17b, an air supply fan stop warning light 18, and an electrical outlet 19 are provided at the upper end of the front surface of the workbench 10.

[0025] The water valve 16a is used to supply water from a water faucet nozzle 51 to a sink 52, which will be described later. The low vacuum valve 16b and the nitrogen valve 16c are used to react reagents in an anhydrous and anoxic reaction in an experimental reaction vessel used in the working space A. The vacuum is used to dry the reaction vessel and replace the gas in the reaction vessel, and the nitrogen is used to react the reagents in an inert gas atmosphere. The air supply fan switch 17a is used to operate the air supply fan 61, which will be described later, and the light switch 17b is used to irradiate light from a light source 71, which will be described later, onto the working surface W of the top plate 12. The air supply fan stop warning light 18 is turned on when the air supply fan 61 stops to warn the user, and the outlet 19 is a power plug socket.

[0026] The hood body 20 of this embodiment encloses the work space A on the workbench 10 from the outside air.

[0027] As shown in Figures 1 and 4, the hood body 20 of this embodiment is composed of a left side wall 21, a right side wall 22, a rear wall 23, an upper wall 24, and a front door 25, and has a generally box-like shape with an open bottom.

[0028] The hood body 20 of this embodiment is disposed so that the rear wall 23, left side wall 21 and right side wall 22 are located at the rear and left and right sides of the upper surface of the workbench 10, respectively, and a top wall 24 is disposed below the upper ends of these. Furthermore, a front door 25 is disposed between the front end of the left side wall 21 and the front end of the right side wall 22. In this manner, the hood body 20 of this embodiment is disposed so as to cover the work surface W of the workbench 10. In this embodiment, the space surrounded by the workbench 10 and the hood body 20 becomes the work space A of the fume hood 1.

[0029] In this embodiment, the right side wall 22 constitutes the right side surface of the hood body 20 .

[0030] As shown in Figures 2(B) and 3, the central portion of the right side wall 22 in this embodiment has a double structure with a space 22c between the inner glass plate 22a facing the work space A and the outer glass plate 22b forming the right outer surface of the hood body 20, and the space 22c is connected to the space 15 of the workbench 10, into which the air within the work space A that flows into the space 15 flows.

[0031] In this embodiment, the left wall 21 constitutes the left side surface of the hood body 20 .

[0032] In this embodiment, the central portion of the left side wall 21 has a double structure with a space 21c between the inner glass plate 21a facing the work space A and the outer glass plate 21b forming the left outer surface of the hood body 20, and the space 21c is connected to the space 15 of the workbench 10, into which the air within the work space A that flows into the space 15 flows.

[0033] The rear wall 23 in this embodiment constitutes the rear surface of the hood body 20 .

[0034] As shown in FIGS. 3 and 5, in this embodiment, the left side wall 21 and the rear wall 23 form a left recessed corner 26, and the right side wall 22 and the rear wall 23 form a right recessed corner 27.

[0035] Furthermore, a left inclined wall 41 is provided so as to hide the left inside corner portion 26, and a right inclined wall 42 is provided so as to hide the right inside corner portion 27.

[0036] In this embodiment, the left inclined wall 41 intersects with the left side wall 21 and the rear wall 23 , and the right inclined wall 42 intersects with the right side wall 22 and the rear wall 23 .

[0037] 3, the left inclined wall 41 in this embodiment is disposed so that its left end is located at the rear end of the inner glass plate 21a and its right end is in contact with the rear wall 23. The right inclined wall 42 is disposed so that its right end is located at the rear end of the inner glass plate 22a and its left end is in contact with the rear wall 23.

[0038] Thus, in this embodiment, the left end of the left inclined wall 41 is positioned so as to be located at the rear end of the inner glass plate 21a, but this is not limited thereto, and the left end of the left inclined wall 41 may be positioned so as to contact a part of the inner surface of the left side wall 21 other than the inner glass plate 21a.

[0039] Similarly, the right end of the right inclined wall 42 may be disposed so as to be in contact with a portion of the inner surface of the right side wall 22 other than the inner surface glass plate 22a.

[0040] 3 and 5, in this embodiment, if the angle between the left inclined wall 41 and the rear wall 23 is θ1 and the angle between the right inclined wall 42 and the rear wall 23 is θ2, in this embodiment, the left inclined wall 41 and the right inclined wall 42 are disposed so that θ1 and θ2 are 135 degrees. Note that the angle between the left side wall 21 and the rear wall 23 is 90 degrees, and the angle between the right side wall 22 and the rear wall 23 is also 90 degrees.

[0041] Therefore, as shown in Figures 3 and 5, if the angle between the left inclined wall 41 and the left side wall 21 is θ3 and the angle between the right inclined wall 42 and the right side wall 22 is θ4, then θ3 and θ4 are 135 degrees.

[0042] Since θ1 to θ4 are greater than 90 degrees, the air in the work space A tends to flow smoothly along the left side wall 21 (inner surface glass plate 21a), left inclined wall 41, and rear wall 23, or along the right side wall 22 (inner surface glass plate 22a), right inclined wall 42, and rear wall 23, as shown in FIG. 5, so that the air in the work space A is less likely to stagnate or turbulence is less likely to form.

[0043] In this embodiment, the left inclined wall 41 and the right inclined wall 42 are positioned so that θ1 and θ2 are 135 degrees. Although θ1 and θ2 are not limited to 135 degrees, it is preferable to partition the left recessed corner 26 and the right recessed corner 27 into a right-angled isosceles triangle or a shape similar thereto when the area is to be enlarged to accommodate experimental equipment inside or in order to smooth the airflow within the work space A.

[0044] In addition, in this embodiment, the left inclined wall 41 and the right inclined wall 42 are positioned so that the angle between the left inclined wall 41 and the tabletop 12, and the angle between the right inclined wall 42 and the tabletop 12 are 90 degrees, but these angles are not limited to 90 degrees and may be less than 90 degrees or greater than 90 degrees.

[0045] In addition, the shape of the left inclined wall 41 in this embodiment is flat, but it is not limited to this and may be a curved surface that curves toward the left inside corner 26. In particular, it is preferable that the left inclined wall 41 has a curved surface that smoothly continues to the left side wall 21 and the rear wall 23.

[0046] Similarly, the shape of the right inclined wall 42 is also flat, but is not limited to this, and may be a curved surface that curves toward the right inside corner 27. In particular, it is preferable that the right inclined wall 42 has a curved surface that smoothly continues to the right side wall 22 and the rear wall 23.

[0047] Even when the left inclined wall 41 and the right inclined wall 42 have the curved shape as described above, θ1 to θ4 are greater than 90 degrees, so that, as in the case where θ1 to θ4 are 135 degrees as described above, the air in the work space A tends to flow smoothly along the left side wall 21, left inclined wall 41 and rear wall 23, or along the right side wall 22, right inclined wall 42 and rear wall 23, so that the air in the work space A is less likely to stagnate or turbulence is less likely to form.

[0048] As long as θ1 to θ4 are greater than 90 degrees, the shapes of the left inclined wall 41 and the right inclined wall 42 may be curved toward the working space A. Even in this case, the air in the working space A tends to flow smoothly along the left side wall 21, the left inclined wall 41, and the rear wall 23, or along the right side wall 22, the right inclined wall 42, and the rear wall 23, so that the air in the working space A is less likely to stagnate or a turbulent flow is less likely to form.

[0049] In this embodiment, the left inclined wall 41 and the right inclined wall 42 have the same shape (flat surface), but one may be flat and the other may be curved as described above.

[0050] As shown in Figs. 3 and 5, in this embodiment, the left inclined wall 41 is provided with an opening 41a, and the right inclined wall 42 is provided with openings 42a and 42b.

[0051] In this embodiment, the left inclined wall 41 and the left inside corner portion 26 form a left space S1, and the right inclined wall 42 and the right inside corner portion 27 form a right space S2.

[0052] In this embodiment, the left space S1 and the right space S2 are used to place experimental equipment used for experiments, research, and other tasks.

[0053] As shown in FIG. 1 and FIG. 3, in this embodiment, a sink 52 as experimental equipment is disposed in the left space S1.

[0054] Sink 52 has a rectangular parallelepiped shape that is long in the vertical direction, and its front surface consists of an opening and an outer periphery, with the opening being provided on the entire front surface excluding the lower portion. The front surface refers to the surface facing work space A. A water faucet nozzle 51 is provided at the upper end of sink 52 and communicates with water supply pipe 53, and a drain port (not shown) is provided at the lower end of sink 52 and communicates with drain pipe 54.

[0055] 1, a sink cover 57 is provided on the front surface of the sink 52 so as to cover only the outer peripheral edge of the sink 52. In this embodiment, the sink cover 57 is fitted into the opening 41a of the left inclined wall 41 so that the sink 52 is disposed in the left space S1.

[0056] By operating the water valve 16a provided on the workbench 10, water is supplied from the water supply pipe 53 through the faucet nozzle 51 to the sink 52, and the supplied water is then drained through the drain pipe 54 into a drain (not shown).

[0057] In this way, since the sink 52 as experimental equipment is arranged in the left space S1, the worker can use water while maintaining the spaciousness of the work space A.

[0058] In the right space S2, nitrogen piping and low vacuum piping (both not shown) are arranged as experimental equipment, and a nitrogen outlet section 55 as an outlet for the nitrogen piping is provided so as to protrude into the working space A through the opening 42a of the right inclined wall 42, and a low vacuum outlet section 56 as an outlet for the low vacuum piping is provided so as to protrude into the working space A through the opening 42b of the right inclined wall 42.

[0059] By operating the nitrogen valve 16c provided on the workbench 10, when a reagent is subjected to an anhydrous and anoxic reaction in an experimental reaction vessel used in the work space A, the reagent can be reacted in an atmosphere of nitrogen, which is an inert gas, via the nitrogen piping and the nitrogen outlet 55. Also, by operating the low vacuum valve 16b provided on the workbench 10, when a reagent is subjected to an anhydrous and anoxic reaction in the reaction vessel, the reaction vessel can be dried and the gas in the reaction vessel can be replaced via the low vacuum piping and the low vacuum outlet 56.

[0060] Because the nitrogen piping and low vacuum piping for experimental equipment are arranged in the right space S2 in this way, the operator can react reagents in an atmosphere of nitrogen, which is an inert gas, while maintaining the spaciousness of the work space A, as well as dry the reaction vessel and replace the gas inside the reaction vessel.

[0061] As described above, in this embodiment, experimental equipment is placed in both the left space S1 and the right space S2, but it is not necessary to place experimental equipment in both the left space S1 and the right space S2, and experimental equipment may be placed in only one of the left space S1 and the right space S2. In other words, it is sufficient that the experimental equipment is placed in at least one of the left space S1 and the right space S2.

[0062] In this embodiment, the experimental equipment includes a sink 52, nitrogen piping, and low vacuum piping, but the experimental equipment is not limited to these and may be, for example, a stand used to secure instruments necessary for an experiment such as test tubes and flasks, a dedicated waste liquid sink used to drain organic solvents and the like that are no longer needed after use in an experiment, an outlet for inserting a power plug, a vacuum valve used to dry a reaction vessel or replace the gas in a reaction vessel when a reagent is subjected to an anhydrous and anoxic reaction in the experimental reaction vessel used in the working space A, and an inert gas valve or combustion gas valve used to react a reagent under an inert gas atmosphere when a reagent is subjected to an anhydrous and anoxic reaction in the reaction vessel.

[0063] The upper wall 24 in this embodiment constitutes the upper surface of the hood body 20 .

[0064] As shown in Figures 4 and 6, the upper wall 24 of this embodiment is configured in its approximate center by a light-diffusing transparent plate 24a (semi-transparent plate) made of milky resin or the like, and a slit portion 24b is provided in front of the upper wall 24 along the left-right direction.

[0065] Moreover, above the upper wall 24, an air intake section 60 and a light source 71 such as an LED or a fluorescent lamp are arranged.

[0066] In this embodiment, the light emitted downward from the light source 71 is diffused and scattered as it passes through the transparent plate 24a, and the diffused light is emitted downward with uniform brightness from the entire lower surface of the transparent plate 24a, illuminating the work surface W of the top plate 12. That is, in this embodiment, the transparent plate 24a and the light source 71 form a light ceiling (light curtain ceiling) that functions as a surface light source that uniformly shines over the entire lower surface of the transparent plate 24a.

[0067] The air intake section 60 of this embodiment supplies air outside the hood body 20 (air in a room such as a laboratory) into the work space A via the slit section 24b and the blowing section 90 described below. The air intake section 60 is composed of an air intake fan 61, an air intake box 62, and an air intake path 63, and an end of the air intake path 63 communicates with the slit section 24b.

[0068] The intake fan 61 takes in air from outside the hood body 20, the intake box 62 temporarily stores the air taken in by the intake fan 61, and the intake passage 63 sends the taken in air to the slit portion 24b.

[0069] 4 and 6, a blowing section 90 is provided in the left-right direction below the slit section 24b in this embodiment. The blowing section 90 blows out the air taken in by the air supply section 60 and causes it to flow into the working space A. The blowing section 90 is composed of a front plate section 91, a rear plate section 92, and a guide section 93.

[0070] The front plate portion 91 and the rear plate portion 92 of this embodiment are long in the left-right direction and arranged in parallel with a predetermined interval, with the upper halves of the front plate portion 91 and the rear plate portion 92 in the up-down direction being arranged perpendicular to the upper wall 24, and the lower halves being bent or curved toward the rear wall 23 of the hood body 20. An upper opening 94 and a lower opening 95 are formed above and below by the front plate portion 91 and the rear plate portion 92. The upper opening 94 also communicates with the slit portion 24b.

[0071] The guide portion 93 of the present embodiment guides the air taken in by the air supply portion 60 and ejected from the lower opening 95 toward the rear wall 23. The guide portion 93 is formed integrally with the rear plate portion 92 so as to extend from the lower end of the rear plate portion 92.

[0072] In this embodiment, as shown in FIG. 6, air supplied from the air supply section 60 to the upper opening 94 of the blowing section 90 through the slit section 24b is ejected from the lower opening 95 and guided along the guide section 93 toward the rear wall 23, thereby becoming a downward air current G1 flowing from the upper front side of the work space A to the lower rear wall 23 side, and flowing into the work space A.

[0073] The front door 25 in this embodiment constitutes the front surface of the hood body 20 .

[0074] As shown in Figs. 4 and 6, the front door 25 of this embodiment is a pull-down door in which two glass plates, a front glass plate 25a and a rear glass plate 25b, are pulled down in unison to close the front.

[0075] In this embodiment, two fixed pulleys 81 are rotatably attached to the front end of the upper part of the left side wall 21 of the hood body 20, and two fixed pulleys 82 are rotatably attached to the rear end of the upper part of the left side wall 21.

[0076] Furthermore, a wire 83 is stretched between the upper fixed pulley 81 of the two fixed pulleys 81 and the upper fixed pulley 82 of the two fixed pulleys 82. A wire 83 is stretched between the lower fixed pulley 81 of the two fixed pulleys 81 and the lower fixed pulley 82 of the two fixed pulleys 82. One end of the upper wire 83 is attached to the front glass plate 25a, and the other end is attached to the balance weight 84. One end of the lower wire 83 is attached to the rear glass plate 25b, and the other end is attached to the balance weight 84.

[0077] Similarly, two fixed pulleys 81 are rotatably attached to the front end of the upper part of the right side wall 22 of the hood body 20, and two fixed pulleys 82 are rotatably attached to the rear end of the upper part of the right side wall 22.

[0078] Furthermore, a wire 83 is stretched between the upper fixed pulley 81 of the two fixed pulleys 81 and the upper fixed pulley 82 of the two fixed pulleys 82. A wire 83 is stretched between the lower fixed pulley 81 of the two fixed pulleys 81 and the lower fixed pulley 82 of the two fixed pulleys 82. One end of the upper wire 83 is attached to the front glass plate 25a, and the other end is attached to the balance weight 84. One end of the lower wire 83 is attached to the rear glass plate 25b, and the other end is attached to the balance weight 84.

[0079] In this embodiment, the total weight of the two balance weights 84 on the left and right sides is adjusted to be equal to the weight of the front door 25. This achieves a weight balance between the front door 25 and the two balance weights 84 on the left and right sides, and the front door 25 can be stopped at any slide position (open position) when the front door 25 is slid.

[0080] Therefore, as shown in Figures 4(A) to (C) and 6, the front door 25 can be maintained in a fully open state (Figure 4(C)), a half-open state (Figures 4(B), Figure 6), or a fully closed state (Figure 4(A)) as needed.

[0081] In this way, the front door 25 can be raised and lowered freely and can be held at any position, and depending on the holding position, an opening 28 is formed in the lower front part as shown in Fig. 6. Then, an operator can insert his / her hand onto the work surface W of the workbench 10 through the opening 28 and perform work such as an experiment on the work surface W.

[0082] 1, 6, etc., in this embodiment, a front cover 29 is attached to the upper part of the front surface of the hood body 20, and is configured to cover a part of the front door 25 when the front door 25 is raised. For example, as shown in FIG. 4(B) or 6, when the front door 25 is half-opened, an upper part of the rear glass plate 25b of the front door 25 is covered by the front cover 29. Also, as shown in FIG. 4(C), when the front door 25 is fully opened, most of the front glass plate 25a and the rear glass plate 25b of the front door 25 are covered by the front cover 29.

[0083] The exhaust means 30 of this embodiment is for exhausting the air within the hood body 20 to the outside.

[0084] The exhaust means 30 of this embodiment has an exhaust port and an exhaust path.

[0085] The exhaust port is provided at the bottom of the work space A and allows air from within the work space A to flow in, and the exhaust path sends the air from within the work space A that flows in from the exhaust port to the outside of the fume hood 1.

[0086] In this embodiment, a large number of circular holes 12 a formed in the outer peripheral edge of the top plate 12 of the workbench 10 serve as exhaust ports of the exhaust means 30 .

[0087] 4 and 6, in this embodiment, a flat exhaust pipe 31 is provided above the upper wall 24 of the hood body 20, and the exhaust pipe 31 is composed of a horizontal pipe section that is parallel to the upper wall 24 and runs in the left-right direction, and a vertical pipe section that bends downward from both the left and right ends of the horizontal pipe section, with the lower end of the left vertical pipe section communicating with the space 21c and the lower end of the right vertical pipe section communicating with the space 22c. Also, as shown in Figures 2 and 4, a circular opening 32 for connecting an exhaust hose (not shown) is provided in the center of the upper surface of the horizontal pipe section of the exhaust pipe 31.

[0088] In this embodiment, the space 15 of the workbench 10, the two spaces 21c and 22c of the hood body 20, the exhaust pipe 31, the opening 32, and the exhaust hose are connected to form an exhaust path of the exhaust means 30. An exhaust fan (not shown) is installed on this exhaust path to forcibly exhaust air in the working space A to the outside of the fume hood 1 through the exhaust port and the exhaust path, and the air in the hood body 20 is exhausted and the working space A is set to a negative pressure, while the negative pressure causes air G2 from the outside (such as a laboratory) to flow into the hood body 20 from the front opening 28 as shown in Fig. 6, so that the air containing contaminated gas in the working space A does not leak outside the hood body 20 (such as a laboratory).

[0089] Next, the state in which the fume hood 1 is used will be described with reference to FIGS.

[0090] FIG. 6 shows a state in which air G1 is blown out from the blowing portion 90 into the working space A by the forced exhaust by the exhaust means 30 and the air supply fan 61 operating.

[0091] Within the work space A, gas G4 in the lower portion is drawn into a large number of circular holes 12a drilled in the outer peripheral edge of the top plate 12 of the workbench 10, and is exhausted to the outside of the fume hood 1 through an exhaust path consisting of the three spaces 15, 21c, 22c, the exhaust pipe 31, the opening 32, and the exhaust hose. Here, gas G4 in the lower portion refers to gas that is generated, for example, by an experiment, has a higher specific gravity than air, and is likely to remain in the lower portion.

[0092] In addition, the air taken in by the air intake section 60 is ejected from the lower opening 95 of the blowing section 90 through the slit section 24b, attracted to the guide section 93 by the Coanda effect, and guided rearward (toward the rear wall 23) along the guide section 93, thereby forming a downward air current G1 that flows diagonally from the upper front to the lower rear within the work space A.

[0093] This downward air current G1 draws in air within the work space A and guides it downward and rearward, encouraging it to flow into the numerous circular holes 12a drilled in the outer periphery of the top plate 12, while drawing in outside air G2 from the open portion 28 and forming an air flow that flows into the work space A near the open portion 28, thereby preventing the air within the work space A from leaking out (to the outside, such as a laboratory) from the open portion 28. In addition, the downward air current G1 strongly draws in air G2 from behind the worker (not shown), enhancing the leakage prevention effect.

[0094] Furthermore, manual work in the work space A is performed in a position close to the open section 28, but the worker's hands are located in front (towards the open section 28) of the downward air current G1 flowing rearward and downward, so the worker's work does not block the downward air current G1 and does not hinder the downward air current G1 from drawing in outside air G2.

[0095] Furthermore, air G3 that rises without being drawn into the circular holes 12a formed in the outer periphery of the top plate 12 flows forward along the upper wall 24 and then descends again within the working space A.

[0096] FIG. 5 shows the air flow near the left inclined wall 41 and the right inclined wall 42 in the above-mentioned usage state.

[0097] As described above, θ1 to θ4 are 135 degrees, i.e., greater than 90 degrees, and therefore, in the vicinity of the left inclined wall 41, the air in the working space A forms an airflow G5 that flows along the left side wall 21 (inner surface glass plate 21a), the left inclined wall 41, and the rear wall 23. In addition, in the vicinity of the right inclined wall 42, an airflow G6 that flows along the right side wall 22 (inner surface glass plate 22a), the right inclined wall 42, and the rear wall 23 is formed.

[0098] In this way, the air in the working space A can easily flow smoothly along the left side wall 21, the left inclined wall 41 and the rear wall 23, or along the right side wall 22, the right inclined wall 42 and the rear wall 23, so that the air in the working space A is less likely to stagnate or to form a turbulent flow. Therefore, the air in the working space A is efficiently exhausted.

[0099] As described above, the fume hood 1 of this embodiment is configured to have a left recessed corner 26 formed by the left side wall 21 and the rear wall 23, and a right recessed corner 27 formed by the right side wall 22 and the rear wall 23, but is not limited to this, and the fume hood of the present invention may not have the left recessed corner 26 or the right recessed corner 27.

[0100] In other words, the left end of the left inclined wall 41 may be connected to the rear end of the left side wall 21, the right end of the left inclined wall 41 may be connected to the left end of the rear wall 23, and the right end of the right inclined wall 42 may be connected to the rear end of the right side wall 22, and the left end of the right inclined wall 42 may be connected to the right end of the rear wall 23.

[0101] Furthermore, among conventional fume hoods, those that exhaust air containing polluted gases in the work space to the outside from above within the hood body via exhaust means require a baffle plate to be provided at the rear within the hood body in order to exhaust gases with a higher specific gravity than air, but this baffle plate gets in the way, making it difficult to provide the left inclined wall 41 and right inclined wall 42 of this embodiment. In contrast, in the fume hood 1 of this embodiment, as described above, air containing polluted gases in the work space A is exhausted to the outside from below within the hood body 20 via the exhaust means 30, eliminating the need to provide a baffle plate, and therefore making it easy to provide the left inclined wall 41 and right inclined wall 42.

[0102] As described above, in the fume hood 1 of this embodiment, the left inclined wall 41 intersecting the left side wall 21 and the rear wall 23 is provided, and the right inclined wall 42 intersecting the right side wall 22 and the rear wall 23 is provided, so that the angle between the left side wall 21 and the rear wall 23 and the inner surface of the left inclined wall 41 and the angle between the right side wall 22 and the rear wall 23 and the inner surface of the right inclined wall 42 are greater than 90 degrees, and the air in the working space A tends to flow smoothly along the left side wall 21, the left inclined wall 41, and the rear wall 23, or along the right side wall 22, the right inclined wall 42, and the rear wall 23. For this reason, the air in the working space A is less likely to stagnate or turbulence is less likely to form, and therefore it can be exhausted efficiently.

[0103] In addition, since the experimental equipment used for work is placed in at least one of the left space S1 formed by the left inclined wall 41 and the left corner 26, and the right space S2 formed by the right inclined wall 42 and the right corner 27, the size of the work space A can be ensured compared to when the experimental equipment is placed within the work space A, thereby improving work efficiency. [Industrial Applicability]

[0104] The fume hood of the present invention can be suitably used when performing work such as chemical experiments in work rooms such as laboratories and research laboratories. [Explanation of symbols]

[0105] 1: Fume hood 10: Workbench 20: Hood body 21: Left side wall 22: Right side wall 23: Back wall 24: Upper wall 26: Left corner 27: Right corner 30: Exhaust means 41: Left Slope Wall 42: Right Slant Wall 52: Sync S1: Left space S2: Right space W: Working surface

Claims

1. A workbench and a hood body having a left side wall, a right side wall, a rear wall, and an upper wall; and an exhaust means for exhausting air inside the hood body to the outside, The hood body is a fume hood arranged to cover the work surface of the workbench, A fume hood characterized in that a left inclined wall is provided intersecting the left side wall and the rear wall, and a right inclined wall is provided intersecting the right side wall and the rear wall.

2. the left inclined wall is provided so as to hide a left recessed corner formed by the left side wall and the rear wall, and the right inclined wall is provided so as to hide a right recessed corner formed by the right side wall and the rear wall, 2. The fume hood according to claim 1, wherein laboratory equipment used for work is placed in at least one of a left space formed by the left inclined wall and the left corner portion and a right space formed by the right inclined wall and the right corner portion.

3. 3. The fume hood of claim 2, wherein the laboratory equipment is a sink.

4. 4. The fume hood according to claim 2 or 3, wherein the laboratory equipment is a gas piping.

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