air blower

Abstract

To provide a blower module which is attached to a fume hood including a lifting door at a front opening to send air into a working space.SOLUTION: A blower module 1 includes: a fan attachment plate 11; a fan 20 attached to the fan attachment plate 11 in a manner that the fan discharges air suctioned from one surface side of the fan attachment plate 11 to the other surface side; a baffle plate 30 installed at the exhaust side of the fan 20; and a casing 80 which houses the fan 20. In the casing 80, a space at the exhaust side of the fan 20 is formed as an exhaust chamber 71. A vent hole 64 for sending air to the outside of the casing 80 is open on a wall of the casing 80 forming the exhaust chamber 71.SELECTED DRAWING: Figure 4

Description

[Technical Field]

[0001] The present invention relates to a blower device provided in a fume hood used when conducting chemical experiments in laboratories and research labs, and to related techniques. [Background technology]

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

[0003] A fume hood encloses the work space above a work table from outside air to prevent the chemical environment in a laboratory from being damaged by contaminated gases such as harmful or foul-smelling gases generated during experiments, and ultimately to prevent the health and safety of experimenters from being harmed. Generally, the hood has an intake-type hood body whose interior space is used as a work space for experiments, and a liftable door is provided above the front opening of the hood body. By opening the liftable door, an operator can insert their hands into the hood body, and then the air inside the hood body is sucked out through an exhaust duct at the top of the hood body, allowing outside air to flow into the hood body through the front opening, preventing contaminated gases inside the hood body from being dispersed into the laboratory through the front opening (see Patent Document 1).

[0004] In addition, some fume hoods of this type have air outlets installed in the front ceiling of the hood body to take in outside air and send it into the work space in order to prevent toxic gases from leaking from the front opening (see Patent Document 2). [Prior art documents] [Patent documents]

[0005] [Patent Document 1] Japanese Patent Application Publication No. 2019-166435 [Patent Document 2] Patent No. 6304822 Summary of the Invention [Problem to be solved by the invention]

[0006] However, the fume hood described in Patent Document 1 had a problem in that the greater the opening of the front door, the slower the wind speed of the air flowing in through the opening, resulting in incomplete containment of toxic gases.

[0007] Furthermore, the fume hood described in Patent Document 2 improves the prevention of toxic gas leakage by sending air into the work space, but the structure of the fume hood becomes complicated. Also, it is extremely difficult to install an air outlet in the hood body and an air supply route to this outlet in existing fume hoods. [Means for solving the problem]

[0008] In view of the above-mentioned background art, the present invention aims to provide a blower that is installed in a fume hood that has a lift door at the front opening and sends air into a work space, and a fume hood that is equipped with this blower.

[0009] That is, the present invention has the configurations described in the following [1] to [6].

[0010] [1] A fan mounting plate; a fan mounted on the fan mounting plate in a manner that draws air from one surface side of the fan mounting plate and discharges it to the other surface side; a baffle plate installed on the exhaust side of the fan; a casing that houses the fan, A blower device characterized in that the space inside the casing on the exhaust side of the fan is formed as an exhaust chamber, and ventilation holes are drilled in the wall of the casing that forms the exhaust chamber to send air outside the casing.

[0011] [2] A blower device as described in the preceding paragraph 1, in which the space inside the casing is divided by a fan mounting plate into an exhaust chamber on the exhaust side of the fan and an intake chamber on the intake side, and ventilation holes are drilled in the wall of the casing that constitutes the intake chamber to take in air outside the casing.

[0012] [3] The blower device according to paragraph 1, wherein the fan mounting plate constitutes a part of the casing, and the entire interior of the casing serves as an exhaust chamber.

[0013] [4] The blower device according to the preceding paragraph 3, wherein the fan mounting plate is the bottom wall of the casing, and a straightening plate is attached to regulate the direction of intake air into the casing forward.

[0014] [5] The air blower according to any one of the above items 1 to 4, wherein the baffle plate constitutes a part of a casing.

[0015] [6] A hood body having a working space therein and an exhaust mechanism for exhausting air from the working space; The front opening of the hood body is opened and closed by a lift door that slides up and down, A fume hood characterized in that the air blower described in any one of items 1 to 5 above is installed at the lower end of the lift door, and the air sucked in from outside the work space is sent into the work space. [Effects of the Invention]

[0016] In the blower described in [1] above, air is drawn in from outside the casing by the fan and discharged into the exhaust chamber. The air discharged from the fan into the exhaust chamber is spread in multiple directions by the baffle plate and sent out through multiple vent holes, allowing it to be sent out of the casing at a substantially uniform wind speed. Moreover, by attaching it to the bottom end of the lift-up door of the hood body, it can be retrofitted to existing fume hoods.

[0017] In the air blower described in [2] above, short-circuiting of air can be prevented.

[0018] In the blower device described in [3] above, a part of the casing doubles as a fan mounting plate, so that it can be made smaller and lighter.

[0019] According to the blower described in [4] above, in a blower in which the bottom wall of the casing also serves as the fan mounting plate, the straightening plate can reliably draw air in from the front of the casing.

[0020] In the blower described in [5] above, a part of the casing doubles as a baffle plate, so that it can be made smaller and lighter.

[0021] In the fume hood described in [6] above, by operating the blower, air is drawn in from outside the hood body and sent into the work space at a uniform speed on both sides of the lift door, i.e., in the left and right directions of the front opening, thereby preventing the leakage of toxic gases to the outside. Moreover, since the blower moves as the lift door moves up and down, the above-mentioned effect can be obtained regardless of the opening angle of the lift door. [Brief explanation of the drawings]

[0022] [Figure 1] 1 is an external perspective view of a first embodiment of a blower according to the present invention; [Figure 2] FIG. 2 is an exploded perspective view of the blower device of FIG. [Figure 3] FIG. 2 is a perspective view of a main part of the blower device of FIG. [Figure 4] FIG. 4 is a cross-sectional view taken along line IV-IV in FIG. [Figure 5] FIG. 2 is a cross-sectional view taken along line VV in FIG. [Figure 6] FIG. 4 is a partially exploded perspective view of a second embodiment of a blower according to the present invention. [Figure 7] FIG. 7 is a vertical cross-sectional view of the blower device of FIG. 6. [Figure 8] FIG. 2 is an overall perspective view of a fume hood to which the blower device of FIG. 1 is attached. [Figure 9] FIG. 9 is a cross-sectional view of a main part of FIG. 8. [Figure 10]FIG. 10 is a perspective view showing another mounting means for the air blower. DETAILED DESCRIPTION OF THE INVENTION

[0023] Two embodiments of a blower according to the present invention and a fume hood equipped with the blower will be described with reference to the drawings.

[0024] The blower is installed at the bottom of the lift door on the front of the fume hood and sends air taken in from outside the hood into the hood. In the following explanation, each direction in the blower is the direction when the blower is installed. That is, the up and down in the installed state are the up and down of the blower, and the outside of the fume hood is defined as the front, and the inside of the fume hood is defined as the back. In addition, the left and right of the blower are the left and right when viewed from the front.

[0025] Furthermore, the same reference numerals denote the same or equivalent parts, and redundant explanations will be omitted. (First blower) The blower 1 in Figures 1 to 5 has a rectangular columnar appearance that is long in the left-right direction, and its main components include a fan mounting member 10, six fans 20 and six baffle plates 30 attached to this fan mounting member 10, and a casing 40.

[0026] The fan mounting member 10 is a U-shaped plate material, and has an upper flange 12 that bends rearward from the upper end of the fan mounting plate 11 that is long in the left-right direction, and a lower flange 13 that bends rearward from the lower end. Rearward-bending partitions 14 are formed at both longitudinal ends of the fan mounting plate 11. Six circular holes 15 are drilled in the fan mounting plate 11 at predetermined intervals along the length, and four fan mounting holes 16 are formed outside each circular hole 15. A blind nut 17 is attached to the underside of the upper flange 12 to secure the fan mounting member 10 within the casing 40, and blind nuts 18a, 18b are attached to the upper surface of the lower flange 13 in pairs in the front-rear direction to secure the fan mounting member 10 within the casing 40.

[0027] The fan 20 is an axial fan equipped with a rectangular frame 21, and is arranged with its intake side facing the rear surface of the fan mounting plate 11 of the fan mounting member 10. The outer diameter of the blades 22 of the fan 20 is approximately the same as the diameter of the circular hole 15 in the fan mounting plate 11. The frame 21 is rectangular and larger than the circular hole 15, with mounting holes 23 formed in the four corners. The operation of the six fans 20 can be controlled by a control device (not shown), which can individually set the operation, stop, and wind speed.

[0028] The baffle plate 30 is a rectangle having approximately the same dimensions as the frame 21 of the fan 20, with mounting holes 31 formed at the four corners and a plurality of ventilation holes 32 drilled in the center. The baffle plate 30 is disposed on the exhaust side of the fan 20.

[0029] The fan 20 and baffle plate 30 are assembled with a cylindrical spacer 35 between them, and a screw inserted into the fan mounting hole 16 from the front side of the fan mounting plate 11 is passed through the mounting hole 23 of the fan 20, the spacer 35, and the mounting hole 31 of the baffle plate 30, and then fastened with a nut. A gap the length of the spacer 35 is formed between the fan 20 and the baffle plate 30.

[0030] 2 shows only one or one set of the fan 20, the baffle plate 30 and the spacer 35, and does not show the other five or five sets.

[0031] The casing 40 is a rectangular column that is longer in the left-right direction than the fan mounting member 10, and the main part is divided into a first casing 41 on the front side and a second casing 61 on the rear side, with the left and right end faces closed by end caps 55. The left-right (longitudinal) dimension of the casing 40 corresponds to the left-right dimension of the lift door of the fume hood in which the blower 1 is installed.

[0032] The first casing 41 has a top wall 42 and a front wall 43 whose lower portion is bent backward. An engagement portion 44 is formed at the rear end of the top wall 42 and bent downward. A front bottom wall 45 is formed at the lower end of the front wall 43 and bent backward. Screw holes 46 are drilled in the top wall 42 at positions corresponding to the blind nuts 17 of the fan mounting member 10, and blind nuts 47 for attaching the mounting bracket 120 are attached to the inner surface. A number of ventilation holes 48 are formed in a row in the left-right direction in the front wall 43, and a mounting hole 49 for a display device is formed to the right of these. A blind nut 50 for attaching the second casing 61 is attached to the inner surface of the engagement portion 44. A screw hole 51 is formed in the front bottom wall 45 at a position corresponding to the blind nut 18a in front of the lower flange 13 of the fan mounting member 10.

[0033] 1 shows a state in which a display device is fitted into the mounting hole 49 of the first casing 41, while FIG. 2 does not show the display device.

[0034] On the other hand, the second casing 61 is L-shaped and has a rear wall 62 and a rear bottom wall 63. The rear wall 62 has a number of ventilation holes 64 formed in a row in the left-right direction, and the engaging portion 44 of the first casing 41 is also formed in the rear wall 62. stomachA screw hole 65 is formed in a position corresponding to the blind nut 50. The rear bottom wall 63 is abutted against the front bottom wall 45 of the first casing 41, and the front bottom wall 45 and the rear bottom wall 63 form the bottom wall of the entire casing 40. A screw hole 66 is formed in the rear bottom wall 63 at a position corresponding to the blind nut 18b on the rear side of the lower flange 13 of the fan mounting member 10.

[0035] The right end cap 55 has a hole through which a power supply cable to a control device including a motor for the fan 20 and a display is pulled out, and a grommet 55a is fitted into the hole. The control device includes an ammeter and a voltmeter, and the operating status of each fan 20 can be monitored by displaying these values ​​on a display. The end cap 55 is attached to the first casing 41 and the second casing 61 via two brackets 56 and 57. The left end cap (not shown) differs from the right end cap 55 in that it does not have a hole for pulling out a cable, but it is attached to the first casing 41 and the second casing 61 in the same way as the right end cap.

[0036] The blower 1 is assembled by attaching the fan mounting member 10, to which the fan 20, spacer 35, and baffle plate 30 are attached, to the first casing 41, and then attaching the second casing 61 and end cap 55. In the assembled state, screw holes 46 and 51 in the first casing 41 overlap with the blind nuts 17 and 18a of the fan mounting member 10, screw hole 65 in the second casing 61 overlaps with the blind nut 50 of the first casing 41, and screw hole 66 in the second casing 61 overlaps with the blind nut 18b of the fan mounting member 10, and the various locations are fastened with screws. In addition, end caps 55 are attached to the left and right end faces of the casing 40 using brackets 56 and 57 and fastened with screws.

[0037] In the blower 1, the left-right dimension of the fan mounting member 10 is shorter than that of the casing 40, so a space is formed inside the casing 40 outside the left and right partitions 14. This space is used to house a control device for the fan 20, including a display device. The inside of the casing 40 is also divided into a front intake chamber 70 and a rear exhaust chamber 71 by the fan mounting plate 11 of the fan mounting member 10. The intake chamber 70 has a vent hole 48 in the front wall 43 of the first casing 41, and the exhaust chamber 71 has a vent hole 64 in the rear wall 62 of the second casing 61.

[0038] When the fan 20 is operated, as shown in FIG. 5, air outside the casing 40 is drawn into the intake chamber 70 through the ventilation holes 48, passes through the fan 20, and is discharged into the exhaust chamber 71 behind the fan 20. Some of the air discharged from the fan 20 passes straight through the ventilation holes 32 in the baffle plate 30, and some is blocked by the baffle plate 30 and is sent out to the rear of the exhaust chamber 71 between the fan 20 and the baffle 30. The air discharged from the fan 20 spreads in multiple directions, with some passing straight through the baffle plate 30 and others bypassing the entire periphery of the baffle plate 30. Furthermore, because multiple fans 20 are installed on the left and right sides of the exhaust chamber 71, the air flowing from adjacent fans 20 collides with air flowing from adjacent fans 20. In this way, the flow of air discharged from the fans 20 spreads in multiple directions within the exhaust chamber 71, and furthermore, air blown out from adjacent fans 20 collides with each other, so that the air is uniformed in the left-right direction (longitudinal direction) of the casing 40 within the exhaust chamber 71, and is blown out of the casing 40 at approximately the same wind speed from the multiple ventilation holes 64 of the exhaust chamber 71. That is, air is blown out at approximately the same wind speed in the left-right direction of the casing 40 regardless of the distance from the fan 20.

[0039] Furthermore, by dividing the inside of the casing 40 into an intake chamber 70 and an exhaust chamber 71, the intake port (vent hole 48 of the intake chamber 70) and the exhaust port (vent hole 64 of the exhaust chamber 71) are spaced apart, which reliably prevents short circuits, in which air circulates within a narrow area. If a short circuit occurs, the amount of air sent to the rear decreases, reducing ventilation efficiency. Furthermore, by providing the intake chamber 70 within the casing 40, noise caused by the rotation of the fan 20 can be reduced.

[0040] The number and spacing of the fans 20 in the blower 1 are not limited. These are determined appropriately depending on the left-right dimension of the lift-up door of the fume hood in which the blower 1 is installed, the air volume of the fans, and other factors. However, taking into account the left-right dimension of the lift-up door and the dimensions of the fans, it is more practical to install multiple fans. Furthermore, installing multiple fans also has the effect of further uniforming the air speed by causing the air blown from adjacent fans to collide with each other.

[0041] Furthermore, the baffle plate in the present invention is not limited to the perforated plate shown in the illustration. A baffle plate without holes can also be used to disrupt or widen the direction of the fan's exhaust air, thereby achieving uniform air speed. Furthermore, the dimensions of the baffle plate do not necessarily have to be the same as those of the fan.

[0042] (Second blower) 6, 7, and 10 has a rectangular column shape that is long in the left-right direction, and includes, as its main components, a casing 80, six fans 20, and a rectifying vane 90. The fans 20 are of the same type as the fans 20 of the blower 1.

[0043] The casing 80 has a bottom wall 81, a front wall 82, a rear wall 83, a top wall 84, and left and right side walls, and is shaped like a rectangular pillar surrounded by these. Figure 6 shows the state where the top wall 84 has been removed, and Figures 7 and 10 show the state where the top wall 84 has been attached.

[0044] The bottom wall 81 is a part of the casing 80 and also serves as a fan mounting plate. Similar to the fan mounting plate 11 of the blower 1, the bottom wall 81 has six circular holes 15 drilled at predetermined intervals in the left-right direction, and four fan mounting holes 16 are formed outside each of the circular holes 15.

[0045] The rear wall 83 has a number of ventilation holes 85 formed therein.

[0046] The fan 20 is disposed with its intake side facing the upper surface of the bottom wall 81 and is attached to the bottom wall 81 using the fan attachment holes 16 .

[0047] The air intake port to the casing 80 of the blower 2 is a circular hole 15 formed in the bottom wall 81. Therefore, the entire interior of the casing 80 is an exhaust chamber 86, and does not have an air intake chamber.

[0048] The straightening plate 90 is an L-shaped bent plate made up of a vertical plate 91 and a horizontal plate 92. The vertical dimension of the vertical plate 91 is greater than the height of the rear wall 83 of the casing 80, and holes 91a are formed therein at the same intervals as the ventilation holes 85. The front-rear dimension of the horizontal plate 92 is the same as that of the bottom wall 81. When the vertical plate 91 is attached to the rear wall 83 of the casing 80 so that the holes 91a and the ventilation holes 85 overlap, the lower end is positioned lower than the bottom wall 81, and a space 93 is formed between the bottom wall 81 and the horizontal plate 92.

[0049] As described above, the casing 80's air intake is a circular hole 15 formed in the bottom wall 81. In a blower with an air intake on the bottom surface of the casing 80, if the fume hood's lift-up door is lowered to its lowest position and the front opening is completely closed, the air intake is blocked and air cannot be drawn in. Opening the lift-up door allows air to be drawn in from below the casing 80, but this can cause turbulence near the front opening, potentially compromising the effectiveness of preventing toxic gas leakage in the work space. For this reason, the blower 2 of this embodiment is equipped with a rectifying plate 90 attached to the casing 80 to ensure that air is always drawn in from the front (outside the hood). The rectifying plate 90 prevents air from being drawn in from below the casing 80 and restricts the air intake direction to the front of the casing 80, directing the air from the front to the circular hole 15.

[0050] The advantage of not providing an air intake chamber inside the casing 80 and instead attaching the rectifying plate 90 to the outside is that the structure of the blower can be simplified and made lighter. The rectifying plate 90 can be used as a handle by inserting the fingertips into the space 93.

[0051] In the blower device 2, when the fan 20 is operated, air outside the casing 80 is drawn into the upper fan 20 from the space 93 through the circular hole 15 in the bottom wall 81 and discharged above the fan 20. The air discharged from the fan 20 collides with the top wall 84 and spreads in multiple directions. Furthermore, because multiple fans 20 are installed along the length of the casing 80, air from adjacent fans 20 also collides with air from adjacent fans 20. In this way, the air flow discharged from the multiple fans 20 is made uniform in the left-right direction of the casing 80 and is sent out of the casing 80 through the multiple ventilation holes 85 in the rear wall 83 at approximately the same wind speed. In other words, air is sent out at approximately the same wind speed in the left-right direction regardless of the distance from the fan 20.

[0052] In the blower 2, the bottom wall 81 also serves as the fan mounting plate of the present invention, so the inside of the casing 80 is not divided, and the entire casing 80 is an exhaust chamber 86. Furthermore, because the top wall 84 also serves as the baffle plate of the present invention, no space is required for installing a baffle plate within the exhaust chamber 86. In this way, by using part of the casing 80 as the fan mounting plate or baffle plate, the size and weight of the blower 2 can be reduced. Because the blower of the present invention is a device that is attached to the lift door of a fume hood, the reduction in size and weight has the great advantage of reducing the load on the lift door.

[0053] The casing 80 of the blower 2 does not have an air intake chamber, but the space surrounded by the bottom wall 81 and the rectifying plate 90 functions as an air intake chamber. (fume hood) 8 and 9 show an example of a fume hood equipped with the blower 1 of FIG.

[0054] The fume hood 100 includes a base 101 as a lower base, and a hood body 102 provided on the base 101.

[0055] An exhaust port 103 is provided on the upper wall of the hood body 102. An exhaust mechanism such as an exhaust duct (not shown) connected to this exhaust port 103 and opening into the work space exhausts air from within the work space, setting the inside of the hood (work space) at a negative pressure, while this negative pressure allows outside air to be introduced into the work space within the hood through a front opening 104, preventing gas from leaking out of the work space. A work table 105 is provided inside the hood body 102.

[0056] The front opening 104 is opened and closed by a lift-up door 106 that slides vertically using a balance weight (not shown) and can be stopped at any position. The lift-up door 106 has a transparent plate 107 that fits into a door frame 113 with a U-shaped cross section around it, and a lower edge member 110 is attached to the lower edge of the door so that the door frame 113 is integrated with the transparent plate 107.

[0057] The lower edge member 110 is formed by integrally bending a plate-shaped handhold plate 111 and a connecting portion 112 extending upward from the rear end of the handhold plate 111. Door frame 113 is integrally formed. In addition, a downward protrusion 114 having an inverted triangular cross section is formed on the underside of the front end of the handhold 111 by bending the extension from the handhold plate 111 twice. The lower edge member 110 is used as a handle when raising and lowering the lift door 106.

[0058] The air blower 1 is attached to the lower edge member 110 by two mounting brackets 120.

[0059] The mounting bracket 120 is a bent plate material, and is bent upward from two opposing long sides of a rectangular base plate 121 to form a first bent portion 122 and a second bent portion 123 of different heights. The height of the first bent portion 122 corresponds to the height of the downward protrusion 114 of the lower edge member 110. The height of the second bent portion 123 is higher than the first bent portion 122, and the extended portion at the tip is bent backward to form a third bent portion 124 that is parallel to the base plate 121. Screw holes 125 and 126 are formed in the base plate 121 and the third bent portion 124, respectively.

[0060] The method for attaching the air blower 1 to the lift door is as follows.

[0061] The screw holes 125 in the base plate 121 of the mounting bracket 120 are aligned with the blind nuts 47 on the top wall 42 of the fan 1, and the bracket is fastened with a screw 127. The handhold plate 111 of the lower edge member 110 of the lift-up door 106 is inserted between the first bent portion 122 and the third bent portion 124 of the mounting bracket 120 attached to the fan 1, and the tip of the handhold plate 111 abuts against the inner surface of the second bent portion 123. When the fan 1 is held horizontally, the upper end of the first bent portion 122 abuts against the lower surface of the handhold plate 111, and the lower end of the downward protrusion 114 of the handhold plate 111 abuts against the base plate 121. Then, a screw 128 is screwed into the screw hole 126 of the third bent portion 124 and tightened until the tip of the screw 128 reaches the upper surface of the handrail plate 111, and the handrail plate 111 is sandwiched between the screw 128 and the first bent portion 122 from above and below. In this way, the blower 1 is attached to the lift-up door 106 of the hood body 102.

[0062] In the air blower 1, a cable (not shown) is pulled out from a grommet 55a of an end cap 55 of the casing 40. The cable moves up and down as the lift door 106 moves up and down, but the cable is protected by a cable protection and guide device such as a plastic rail chain.

[0063] When the blower 1 is operated, it draws in air outside the hood body 102 through the vent hole 48 in the intake chamber 70 and sends it into the work space through the vent hole 64 in the exhaust chamber 71. By setting the exhaust mechanism to a negative pressure in the work space, the blower 1 sends external air into the work space in addition to the air introduced from the outside through the front opening 104. In this way, the blower 1 forcibly sends external air into the work space, so even if the amount of air introduced by the exhaust mechanism is insufficient due to the lift door 106 being wide open, leakage of the atmosphere in the work space, which may contain toxic gases, is reliably prevented. Furthermore, while the flow of air introduced into the work space by the exhaust mechanism can be disturbed by experimenters standing near the front opening 104 or their work movements, or by the air conditioning in the laboratory, the air sent into the work space by the blower 1 is unaffected or extremely resistant to these disturbances, thereby reliably preventing the leakage of toxic gases. Moreover, the speed of the air sent into the work space by the blower 1 is uniform in the left-right direction of the lift door 106, i.e., in the left-right direction of the front opening 104, so it is possible to reliably prevent the leakage of toxic gases to the outside. Furthermore, since the blower 1 moves as the lift door 106 rises and falls, the above-mentioned effects can be obtained regardless of the opening degree of the lift door 106.

[0064] In addition, since the blower 1 can adjust the wind speed of the plurality of fans 20 individually, it is also possible to increase the wind speed at a specific position in the left-right direction.

[0065] The above has been a description of the fume hood 100 to which the blower 1 of the first embodiment is attached, but the blower 2 of the second embodiment can also be attached to the lower edge member 110 of the lift door 106 using the mounting bracket 120. The same effects can be obtained with the fume hood 100 to which the blower 2 is attached as with the blower 1.

[0066] The blower of the present invention is attached to the lower end of the lift door 106 of the hood body 102. When the lift door 106 is raised, a space is created directly below it, ensuring installation space for any lift door. This means that the blower can be retrofitted to an existing fume hood. Of course, it is also possible to design a new fume hood with the blower integrated as part of the lift door. Furthermore, since the lift door is a component that separates the work space from the outside air, and the blower attached to its lower end is in contact with both the work space and the outside air, no intake duct is required to bring outside air into the blower, which is also advantageous for installation in an existing fume hood.

[0067] The present invention does not limit the method of attaching the air blower to the lift door, and any attachment means may be selected according to the shape of the lower part of the lift door.

[0068] 10 shows an example in which a mounting bracket 130 is combined with the air blower 2 of the second embodiment to directly mount the transparent plate 107 of the lift-up door 106. The mounting bracket 130 has a U-shaped cross section and is substantially the same shape as the door frame 113 (see FIG. 9), with the lower end of the transparent plate 107 fitting into a groove. The mounting bracket 130 can be attached to the top surface of the casing 80 later, or can be formed integrally with the casing 80 in advance. [Industrial Applicability]

[0069] The air blower of the present invention is attached to the lifting door of a fume hood when conducting experiments that generate toxic gases in laboratories or research laboratories. [Explanation of symbols]

[0070] 1, 2...Ventilation equipment 10...Fan mounting bracket 11...Fan mounting plate 15...Circular hole 20...Fan 30...Baffle plate 40...Casing 41...First casing 42…Top wall 43…Front wall 44...Engagement portion 45…Front bottom wall 48, 64, 85...Ventilation holes 61...Second casing 62…Rear wall 63...Rear bottom wall 70...Intake chamber 71, 86 Exhaust chamber 80...Casing 81...Bottom wall (fan mounting plate) 82...Front wall 83…Rear wall 84...Top wall (baffle plate) 90…straightening plate 100...Fume hood 102...Hood body 104…Front opening 106...Lift door 107...Transparent plate 110...Lower edge member 113...door frame 120, 130...Mounting bracket

Claims

1. A fan mounting plate; a fan mounted on the fan mounting plate in a manner that draws air from one surface side of the fan mounting plate and discharges it to the other surface side; a baffle plate installed on the exhaust side of the fan; a casing that houses the fan, Within the casing, a space on the exhaust side of the fan is formed as an exhaust chamber, and a vent hole for sending air out of the casing is formed in a wall of the casing that forms the exhaust chamber, The fan mounting plate constitutes a part of a casing, and the entire interior of the casing serves as an exhaust chamber.

2. 2. The blower device according to claim 1, wherein the fan mounting plate is a bottom wall of the casing, and a flow straightening plate is attached to the fan mounting plate to restrict the direction of intake air into the casing to the front.

3. 3. The blower device according to claim 1, wherein the baffle plate forms a part of a casing.

4. A work space is provided inside the hood body, and the hood body has an exhaust mechanism for exhausting air from the work space. The front opening of the hood body is opened and closed by a lift door that slides up and down, A fume hood characterized in that a blower device according to any one of claims 1 to 3 is installed at the lower end of the lifting door, and the air sucked in from outside the work space is sent into the work space.

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