JP2023037391A - Blower module - Google Patents

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 The present invention relates to an air blower provided in a fume hood used for chemical experiments in laboratories and research laboratories, and related technology.

In laboratories, laboratories, etc., fume hoods are usually used to conduct experiments such as chemical reactions using chemicals, heat treatment, decomposition, extraction, and the like.

The fume hood is designed so that the chemical environment in the laboratory will not be damaged by pollutant gases such as harmful gases and malodorous gases generated during experiments, and the health and safety of experimenters will not be impaired. , which encloses the work space above the work table from the outside air, and is generally provided with an intake-type hood body whose internal space is used as a work space for experiments, etc., and can be raised and lowered above the front opening of this hood body. A door is provided. Then, by opening the elevating door and allowing the operator to insert his/her hand into the hood body, the air inside the hood body is sucked and discharged through the exhaust duct at the upper end of the hood body, thereby removing the air from the front opening. Outside air is allowed to flow into the hood body to prevent polluted gas in the hood body from diffusing into the laboratory through the front opening (see Patent Document 1).

In addition, in order to prevent toxic gas from leaking from the front opening of this type of fume hood, an air outlet is installed in the front part of the ceiling of the hood body to take in outside air and send it into the work space. (see Patent Document 2).

JP 2019-166435 A Japanese Patent No. 6304822

However, the fume hood described in Patent Literature 1 has a problem that as the opening of the front door is increased, the velocity of the air flowing in from the opening decreases, resulting in imperfect containment of toxic gases.

Further, 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. In addition, it is extremely difficult to install an air outlet in the hood body of an existing fume hood and to install an air supply route to this outlet.

SUMMARY OF THE INVENTION In view of the background art described above, an object of the present invention is to provide an air blower provided in a fume hood having an elevating door at its front opening to blow air into a work space, and a fume hood equipped with this air blower. .

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

[1] a fan mounting plate;
a fan attached to the fan mounting plate in such a manner that air sucked from one surface side of the fan mounting plate is discharged 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, in the casing, a space on the exhaust side of the fan serves as an exhaust chamber, and a ventilation hole for sending air out of the casing is formed in a wall of the casing constituting the exhaust chamber. .

[2] The space in 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 a wall of the casing forming the intake chamber has a ventilation hole for taking in air outside the casing. The blower device according to the preceding item 1, which is perforated.

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

[4] The blower device according to the above item 3, wherein the fan mounting plate is the bottom wall of the casing, and a rectifying plate is mounted to regulate the direction of air intake into the casing to the front.

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

[6] A hood body provided with a work space inside and having a discharge mechanism for discharging air in the work space,
The front opening of the hood body is opened and closed by an elevating door that slides up and down,
A fume hood, wherein the air blower according to any one of the preceding items 1 to 5 is installed at the lower end of the elevating door, and the air sucked from outside the work space is sent into the work space.

In the blower device described in [1] above, the air taken in from outside the casing by the fan is discharged into the exhaust chamber. The air discharged from the fan to the exhaust chamber spreads in multiple directions by the baffle plate, and can be sent out of the casing at approximately the same wind speed by sending it out from a plurality of ventilation holes. Moreover, it can be retrofitted to an existing fume hood by attaching it to the lower end of the elevating door of the hood body.

In the air blower described in [2] above, it is possible to prevent short-circuiting of the air.

In the blower device described in [3] above, since a part of the casing also serves as the fan mounting plate, the size and weight of the blower can be reduced.

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

In the air blower described in [5] above, part of the casing also serves as the baffle plate, so that the size and weight of the blower can be reduced.

In the fume hood described in [6] above, by operating the air blower, the air outside the hood body is sucked in, and the air with a uniform wind speed in the left and right of the elevating door, that is, in the left and right direction of the front opening is blown into the work space. By sending it inside, it is possible to prevent leakage of toxic gas to the outside. Moreover, since the blower moves as the elevator door moves up and down, the above effects can be obtained regardless of the degree of opening of the elevator door.

1 is an external perspective view of a first embodiment of a blower device of the present invention; FIG. FIG. 2 is an exploded perspective view of the blower of FIG. 1; FIG. 2 is a perspective view of a main part of the blower device of FIG. 1; FIG. 2 is a sectional view taken along line IV-IV of FIG. 1; FIG. 2 is a cross-sectional view taken along line VV of FIG. 1; FIG. 5 is a partially exploded perspective view of a second embodiment of the air blower of the present invention; FIG. 7 is a longitudinal sectional view of the blower device of FIG. 6; Fig. 2 is an overall perspective view of a fume hood to which the blower device of Fig. 1 is attached; FIG. 9 is a cross-sectional view of a main part of FIG. 8; It is a perspective view which shows the other attachment means of an air blower.

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

The blower is installed at the lower end of the elevating door on the front of the fume hood, and is a device that blows air taken in from outside the hood into the hood. In the following description, each direction of the blower is the direction in which the blower is installed. That is, the top and bottom in the installed state are the top and bottom of the blower, the outside of the fume hood is defined as the front, and the inside of the fume hood is defined as the rear. Also, the left and right of the blower are the left and right when the blower is viewed from the front.

In addition, items with the same reference numerals represent the same or equivalent items, and overlapping descriptions are omitted.
(First blower)
The air blower 1 shown in FIGS. 1 to 5 has a prismatic appearance that is elongated in the left-right direction. It has six baffle plates 30 and a casing 40 .

The fan mounting member 10 is a U-shaped plate material, and has an upper flange 12 bent rearward from the upper end of a fan mounting plate 11 that is elongated in the left-right direction, and a lower flange 13 bent rearward from the lower end. It is Partitions 14 are formed at both longitudinal ends of the fan mounting plate 11 so as to bend backward. Six circular holes 15 are formed in the fan mounting plate 11 at predetermined intervals in the longitudinal direction, and four fan mounting holes 16 are formed outside each of the circular holes 15 . A blind nut 17 for fixing the fan mounting member 10 in the casing 40 is attached to the lower surface of the upper flange 12 , and a blind nut 17 is attached to the upper surface of the lower flange 13 for fixing the fan mounting member 10 in the casing 40 . A set of two blind nuts 18a and 18b are attached in the front-rear direction.

The fan 20 is an axial fan having a rectangular frame 21 and is arranged with the intake side facing the rear surface of the fan mounting plate 11 of the fan mounting member 10 . The outer diameter of the blade portion 22 of the fan 20 is approximately the same as the diameter of the circular hole 15 of the fan mounting plate 11 . The frame 21 has a quadrangular shape larger than the circular hole 15 and has mounting holes 23 formed at its four corners. The operation of the six fans 20 can be individually set to run/stop and wind speed by a control device (not shown).

The baffle plate 30 has a rectangular shape with substantially the same dimensions as the frame 21 of the fan 20, and has mounting holes 31 formed at its four corners and a plurality of ventilation holes 32 formed at its central portion. The baffle plate 30 is arranged on the exhaust side of the fan 20 .

The fan 20 and the baffle plate 30 are assembled with a cylindrical spacer 35 interposed between them. Screws inserted into the fan mounting holes 16 from the front side of the fan mounting plate 11 , through mounting holes 31 of the baffle plate 30, and are fastened with nuts. A gap corresponding to the length of the spacer 35 is formed between the fan 20 and the baffle plate 30 .

2 shows only one or one set of the fan 20, the baffle plate 30 and the spacer 35, and the illustration of the other five pieces or five sets is omitted.

The casing 40 has a prismatic shape that is longer in the lateral direction than the fan mounting member 10. The main portion is divided into a first casing 41 on the front side and a second casing 61 on the rear side. blocked. The lateral (longitudinal) dimension of the casing 40 corresponds to the lateral dimension of the elevating door of the fume hood in which the blower 1 is installed.

The first casing 41 has an upper surface wall 42 and a front wall 43 whose lower portion is bent rearward. A front bottom wall 45 is formed to bend backward from the lower end of 43 . A screw hole 46 is drilled in the top wall 42 at a position corresponding to the blind nut 17 of the fan mounting member 10, and a blind nut 47 for mounting the mounting bracket 120 is mounted on the inner surface. A large number of ventilation holes 48 are formed in a horizontal row in the front wall 43, and a mounting hole 49 for a display device is formed on the right side thereof. A blind nut 50 for assembling the second casing 61 is attached to the inner surface of the engaging portion 44 . A screw hole 51 is formed in the front bottom wall 45 at a position corresponding to the blind nut 18 a on the front side of the lower flange 13 of the fan mounting member 10 .

1 shows a state in which the display device is assembled in the mounting hole 49 of the first casing 41, and FIG. 2 omits illustration of the display device.

On the other hand, the second casing 61 is L-shaped with a rear wall 62 and a rear bottom wall 63 . A large number of ventilation holes 64 are formed in a horizontal row in the rear wall 62 , and screw holes 65 are formed at positions corresponding to the brand nuts 50 of the engaging portion 44 of the first casing 41 . The rear bottom wall 63 abuts 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 .

The right end cap 55 is provided with a hole through which a power supply cable for a control device including a motor for the fan 20 and a display is pulled out, and a grommet 55a is fitted therein. 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 the 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) is attached to the first casing 41 and the second casing 61 in the same manner as the right end cap, although it differs from the right end cap 55 in that it does not have a hole for drawing out the cable.

The blower device 1 is assembled by attaching the fan mounting member 10 to which the fan 20, the spacer 35 and the baffle plate 30 are attached, to the first casing 41, and further attaching the second casing 61 and the end cap 55 thereto. In the assembled state, the screw holes 46, 51 of the first casing 41 overlap the blind nuts 17, 18a of the fan mounting member 10, the screw holes 65 of the second casing 61 overlap the blind nut 50 of the first casing 41, and the second casing 41 is assembled. Since the screw hole 66 of the 2 casing 61 overlaps with the blind nut 18b of the fan mounting member 10, each place is screwed. Further, the end caps 55 are attached to the left and right end faces of the casing 40 using receiving metal fittings 56 and 57 and screwed.

In the blower device 1 , since the lateral dimension of the fan mounting member 10 is shorter than the casing 40 , a space is formed outside the left and right partitions 14 in the casing 40 . This space is used to house the controls for the fan 20, including the display. The inside of the casing 40 is partitioned 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 .

When the fan 20 is operated, as shown in FIG. 5, air outside the casing 40 is taken into the air intake chamber 70 through the ventilation holes 48, passes through the fan 20, and is discharged to the exhaust chamber 71 behind the fan 20. As shown in FIG. Part of the air discharged from the fan 20 goes straight through the ventilation holes 32 of the baffle plate 30, and part of it is blocked by the baffle plate 30 and sent out from between the fan 20 and the baffle 30 to the rear of the exhaust chamber 71. be The air discharged from the fan 20 spreads in multiple directions due to the straight flow passing through the baffle plate 30 and the flow detoured from the entire circumference of the baffle plate 30 . Furthermore, since a plurality of fans 20 are installed on the left and right sides of the exhaust chamber 71, the air flowing from the adjacent fans 20 collides with each other. In this way, in the exhaust chamber 71 , the flow of air discharged from the fan 20 is expanded in multiple directions, and the air blown from the adjacent fan 20 collides with each other, thereby It is uniformed in the direction (longitudinal direction) and sent out of the casing 40 from the plurality of ventilation holes 64 of the exhaust chamber 71 at substantially the same wind speed. That is, in the left-right direction of the casing 40, air is sent out at substantially the same wind speed regardless of the distance from the fan 20. As shown in FIG.

Further, by partitioning the inside of the casing 40 into the intake chamber 70 and the exhaust chamber 71, the intake port (the ventilation hole 48 of the intake chamber 70) and the exhaust port (the ventilation hole 64 of the exhaust chamber 71) are separated from each other. A short circuit in which air circulates can be reliably prevented. When a short circuit occurs, the amount of air to be sent to the rear decreases and the ventilation efficiency drops. Further, by providing the air intake chamber 70 in the casing 40, noise caused by the rotation of the fan 20 can be reduced.

The number of fans 20 and mounting intervals in the blower device 1 are not limited. These are appropriately determined according to the horizontal dimension of the elevating door of the fume hood in which the blower 1 is installed, the air volume of the fan, and the like. However, considering the horizontal dimension of the elevating door and the dimension of the fan, it is realistic to install a plurality of fans. In addition, by installing a plurality of fans, the winds sent out from the adjacent fans collide with each other, so that the uniformity of the wind speed can be further enhanced.

Also, the baffle plate in the present invention is not limited to the perforated plate shown in the drawings. Even with a baffle plate without holes, it is possible to make the air velocity uniform by disturbing the direction of exhaust air from the fan or widening it. Also, the size of the baffle plate is not limited to the same size as the fan.

(Second blower)
6, 7, and 10 has a prismatic appearance elongated in the left-right direction, and includes a casing 80, six fans 20, and a rectifying plate 90 as main constituent members. The fan 20 is of the same type as the fan 20 of the blower 1 .

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 has a prism shape surrounded by them. 6 shows the top wall 84 removed, and FIGS. 7 and 10 show the top wall 84 attached.

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

A large number of ventilation holes 85 are formed in the rear wall 83 .

The fan 20 is arranged with the intake side facing the upper surface of the bottom wall 81 and is attached to the bottom wall 81 using the fan attachment hole 16 .

A circular hole 15 formed in the bottom wall 81 serves as an air inlet to the casing 80 of the blower 2 . Accordingly, the entire interior of the casing 80 is an exhaust chamber 86 and does not have an intake chamber.

The straightening plate 90 is an L-shaped bending plate composed 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 drilled at the same intervals as the ventilation holes 85. As shown in FIG. The dimension of the horizontal plate 92 in the front-rear direction 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 hole 91a and the ventilation hole 85 overlap, the lower end is positioned below the bottom wall 81 and a space is provided between the bottom wall 81 and the horizontal plate 92. 93 is formed.

As mentioned above, the air intake of casing 80 is circular hole 15 formed in bottom wall 81 . The air blower having an air intake on the bottom surface of the casing 80 cannot take air because the air intake is blocked when the front opening is completely closed by lowering the elevating door of the fume hood to the lower end. If the lift door is opened, air can be drawn in from below the casing 80, but air may be drawn in not only from directly below the casing 80 but also from the working space. Then, a turbulent flow occurs near the front opening, and the effect of preventing leakage of toxic gas in the working space is impaired. Therefore, in the blower device 2 of the present embodiment, the rectifying plate 90 is attached to the casing 80 so that air is always taken in from the front (outside the hood). The rectifying plate 90 prevents intake air from below the casing 80 , restricts the direction of intake air to the front of the casing 80 , and guides forward air to the circular hole 15 .

By not providing an air intake chamber in the casing 80 but mounting the rectifying plate 90 on the outside, there is an advantage that the structure of the air blower can be simplified and the weight can be reduced. It should be noted that the straightening plate 90 can be used as a handle by inserting a fingertip into the space 93 and using the horizontal plate 92 as a handle.

In the blower device 2, when the fan 20 is operated, the air outside the casing 80 is sucked into the upper fan 20 from the space 93 through the circular hole 15 of the bottom wall 81 and is discharged above the fan 20. As shown in FIG. Air discharged from the fan 20 hits the top wall 84 and spreads in multiple directions. In addition, since a plurality of fans 20 are installed in the longitudinal direction of the casing 80, the air flowing from adjacent fans 20 collides with each other. In this way, the air flow discharged from the plurality of fans 20 is made uniform in the lateral direction of the casing 80 and sent out of the casing 80 through the plurality of ventilation holes 85 of the rear wall 83 at substantially equal wind speeds. That is, regardless of the distance from the fan 20, the air is sent out at substantially the same wind speed in the horizontal direction.

Since the bottom wall 81 of the blower device 2 also serves as a fan mounting plate in the present invention, the inside of the casing 80 is not partitioned, and the whole is an exhaust chamber 86 . Further, since the upper surface wall 84 also serves as a baffle plate in the present invention, no installation space for a baffle plate is required inside the exhaust chamber 86 . By using a part of the casing 80 as a fan mounting plate or a baffle plate in this way, the size and weight of the blower device 2 can be reduced. Since the air blower of the present invention is attached to the elevating door of the fume hood, it has a great merit of reducing the load on the elevating door by making it smaller and lighter.

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 current 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.

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

An exhaust port 103 is provided on the upper wall of the hood body 102 . Then, the air in the work space is discharged by an exhaust mechanism such as an exhaust duct (not shown) that is connected to the exhaust port 103 and opens into the work space, and the inside of the hood (work space) is set to a negative pressure. On the other hand, due to the negative pressure, outside air is introduced into the work space in the hood through the front opening 104, so that the gas in the work space does not leak to the outside. A work table 105 is provided inside the hood body 102 .

The front opening 104 can be opened and closed by a lift door 106 that slides vertically by means of a balance weight (not shown) and can be stopped at any position. The elevating door 106 has a transparent plate 107 whose periphery is fitted to a door frame 113 having a U-shaped cross section, and a lower edge member 110 is attached to the lower edge portion so as to be integrated with the door frame 113 .

The lower edge member 110 is formed by integrally bending a plate-shaped handhold plate 111 and a connection portion 112 extending upward from the rear end of the handhold plate 111. In front of the upper end of the connection portion 112, The receiving portion 113 is integrated. In addition, a downward projection 114 having an inverted triangular cross section is formed on the lower surface of the front end of the handhold 111 by bending the extended portion from the handhold plate 111 twice. The lower edge member 110 is used as a handle for moving the lift door 106 up and down.

The blower device 1 is attached to the lower edge member 110 with two mounting brackets 120 .

The mounting bracket 120 is a bent plate product, and is bent upward from two opposite long sides of a rectangular base plate 121 to form a first bent portion 122 and a second bent portion 123 having different heights. ing. 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 that of the first bent portion 122 , and the extended portion of the tip is bent backward to form a third bent portion 124 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.

A method of attaching the blower 1 to the lift door is as follows.

The screw hole 125 of the base plate 121 of the mounting bracket 120 is aligned with the blind nut 47 of the upper wall 42 of the blower 1 and fixed with the screw 127 . The handhold plate 111 of the lower edge member 110 of the lift door 106 is inserted between the first bent portion 122 and the third bent portion 124 of the mounting bracket 120 attached to the blower device 1 , and the tip of the handhold plate 111 is inserted into the second bent portion 123 . abut against the inner surface of When the blower 1 is kept horizontal, the upper end of the first bent portion 122 contacts the lower surface of the handle plate 111 , and the lower end of the downward projection 114 of the handle plate 111 contacts the base plate 121 . A screw 128 is screwed into the screw hole 126 of the third bent portion 124 , and the tip of the screw 128 is tightened until it reaches the upper surface of the handle plate 111 . Sandwich from top and bottom. As a result, the blower device 1 is attached to the lift door 106 of the hood body 102 .

The blower device 1 has a cable (not shown) drawn out from a grommet 55 a 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 guide device such as a plarail chain.

When the blower device 1 is operated, the blower device 1 sucks air from the outside of the hood body 102 through the ventilation hole 48 of the intake chamber 70 and sends the air through the ventilation hole 64 of the exhaust chamber 71 into the working space. In addition to the air introduced from the outside through the front opening 104, external air is sent by the blower 1 in the work space by setting the exhaust mechanism to a negative pressure. In this way, since the outside air is forcibly sent into the work space by the blower 1, even if the amount of air introduced by the exhaust mechanism is insufficient due to the opening of the elevating door 106 wide, the work space contains toxic gas. Possible leakage of the working space atmosphere can be reliably prevented. In addition, the flow of air introduced into the work space by the exhaust mechanism may be disturbed by the experimenter standing near the front opening 104 or by his/her work, or may be disturbed by the air conditioning in the laboratory. Since the air sent into the working space by the blower 1 is not affected by these factors, or is extremely unlikely to be affected by them, it is possible to reliably prevent leakage of toxic gases. Moreover, since the velocity of the air blown into the work space by the blower 1 is uniform in the lateral direction of the elevating door 106, that is, in the lateral direction of the front opening 104, leakage of toxic gas to the outside is reliably prevented. be able to. Furthermore, since the blower 1 moves as the elevator door 106 moves up and down, the above effects can be obtained regardless of the opening degree of the elevator door 106 .

In addition, since the blower device 1 can individually adjust the wind speed of the plurality of fans 20, the wind speed at a specific position in the horizontal direction can be increased.

The above is a description of the fume hood 100 to which the blower device 1 of the first embodiment is attached. . The fume hood 100 to which the blower device 2 is attached also has the same effect as when the blower device 1 is attached.

The air blower of the present invention is attached to the lower end of the elevating door 106 of the hood body 102 . When the lift door 106 is lifted, a space is created directly under it, so installation space is ensured for any lift door. Therefore, existing fume hoods can be retrofitted with blowers. Of course, a design in which the blower is integrated as part of the newly installed fume hood lift door is also possible. In addition, the elevating door is a member that separates the work space from the outside air, and the blower attached to the lower end of the door is in contact with both the work space and the outside air, so an air supply duct is required to take in the outside air into the blower. Not doing so is also advantageous for installation in existing fume hoods.

The present invention does not limit the mounting method of the air blower to the lift door, and the mounting means may be selected according to the shape of the lower portion of the lift door.

FIG. 10 shows an example in which the blower device 2 of the second embodiment is combined with a mounting bracket 130 for directly mounting to the transparent plate 107 of the elevating 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), and the lower end of the transparent plate 107 is fitted in the groove. The mounting bracket 130 can be attached to the upper surface of the casing 80 afterward, or can be formed integrally with the casing 80 in advance.

INDUSTRIAL APPLICABILITY The blower of the present invention is used by attaching it to the elevating door of a fume hood when conducting experiments in which toxic gases are generated in laboratories and laboratories.

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

Claims (6)

a fan mounting plate;
a fan attached to the fan mounting plate in such a manner that air sucked from one surface side of the fan mounting plate is discharged 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, in the casing, a space on the exhaust side of the fan serves as an exhaust chamber, and a ventilation hole for sending air out of the casing is formed in a wall of the casing constituting the exhaust chamber. . A space in 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 of the fan, and a wall of the casing forming the intake chamber is provided with a ventilation hole for taking in air outside the casing. The blower device according to claim 1. 2. A blower device according to claim 1, wherein said fan mounting plate constitutes a part of a casing, and the entire interior of the casing is an exhaust chamber. 4. The blower device according to claim 3, wherein said fan mounting plate is a bottom wall of a casing, and a rectifying plate is mounted to regulate the direction of air intake into the casing to the front. The air blower according to any one of claims 1 to 4, wherein the baffle plate constitutes a part of a casing. A hood body provided with a work space inside and having a discharge mechanism for discharging air in the work space,
The front opening of the hood body is opened and closed by an elevating door that slides up and down,
A fume hood, wherein the air blower according to any one of claims 1 to 5 is installed at the lower end of the elevating door, and the air sucked from outside the work space is sent into the work space. .

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