JPH0651743U - Fan unit with backflow prevention damper - Google Patents

Abstract

(57) [Summary] [Purpose] To prevent backflow of indoor air into the fan unit without providing a box-type damper. [Structure] A packing material is provided on the outer peripheral edges of vertical outlets 11 and 12 of the conditioned air in the unit body 2, and a damper plate having a rotation fulcrum near the upper edges of the outlets 11 and 12. 21 and 21 are provided so as to be rotatable in the discharge flow direction of the conditioned air. [Effect] The damper plate opens when the fan unit is operating, but the damper plate is closed airtightly when the indoor pressure becomes higher. Since the damper plate is housed inside the unit, there is no need to install a separate box-type damper.

Description

[Detailed description of the device]

[0001]

[Industrial applications]

 The present invention relates to a fan unit having a backflow prevention damper.

[0002]

[Prior art]

 Speaking of, for example, a fan filter unit used in a clean room, etc., this type of fan filter unit is usually attached to the ceiling surface in order to supply the conditioned air from the separately installed processing device into the clean room. Air-conditioned air from the chambers and air supply ducts installed in the unit is sucked in by the fan installed in the unit and supplied to the clean room through the filter.

A conventional fan unit typified by such a fan filter unit has a suction port from the outside to prevent backflow of indoor air when the fan units are individually stopped. A box-shaped damper was attached separately.

[0004]

[Problems to be solved by the device]

 However, with the above-described conventional techniques, it takes time and effort for construction, and there is a risk of damage or deformation during construction or transportation. In addition, the conventional box-shaped damper has a large damper size, and if it is slightly deformed, the original performance of the damper may not be exhibited due to, for example, leakage. Furthermore, since it is configured to be installed outside the fan unit separately, space for the damper installation was required outside the unit.

[0005]

[Means for Solving the Problems]

 The present invention has been made in view of such a point, and a damper, which is conventionally attached to the outside of the fan unit, is provided inside the unit. It is intended to solve the above problems by providing a mechanism for opening and closing.

Therefore, in this invention, in a fan unit such as a fan filter unit having a discharge port for conditioned air in a vertical direction in the unit, an airtight material such as a packing material is arranged on the outer peripheral edge of the discharge port. Further, a damper plate having a rotation fulcrum near the upper edge of the discharge port and covering the discharge port is provided outside the vicinity of the discharge port so as to be rotatable in the discharge flow direction (direction of air supply). We provide a fan unit with a backflow prevention damper.

[0007]

[Action]

 When the fan unit is operating to discharge conditioned air into the room (in the air supply state), the damper plate rotates in the supply air flow direction to open the discharge port due to the supply air flow. When the fan unit is stopped, the damper plate is hung vertically by its own weight, and the discharge port is closed. Furthermore, when this fan unit is stopped and the room pressure becomes higher due to the operation of another fan unit, for example, the damper plate is pressed toward the discharge port side by the pressure at that time, and The airtight material is placed on the outer peripheral edge of the outlet, and the outlet is completely closed. As a result, backflow of indoor air into the fan unit is prevented.

[0008]

【Example】

 An embodiment of the present invention will be described below with reference to the drawings. FIG. 1 is a side sectional view of a first embodiment applied to a fan filter unit 1 installed on a ceiling surface of a clean room or the like, and FIG. The respective states are shown, and the unit main body 2 has a substantially box shape, and the fan motor 3 is provided at the center of the unit main body 2. The rotation shaft 4 of the fan motor 3 is directly connected to the fan runner 5, and the rotation thereof causes the blades 6 to rotate directly.

By the rotation of the centrifugal fan having such a configuration, the conditioned air sucked from the suction flange 7 provided on the top plate 2a of the unit body 2 is stored in the fan casing 8 located on the outer periphery of the blade 6. The liquid is discharged from the discharge ports 11 and 12 which are vertically provided on the left and right sides through the flow paths 9 and 10.

On the other hand, on the inner side wall of the unit main body 2 and in front of the discharge ports 11 and 12, sound absorbing materials 13 and 14 having a substantially L-shaped side surface are provided, and from the discharge ports 11 and 12. The discharged conditioned air is supplied from the lower surface of the fan casing 8, the partition plate 15 below the fan motor 3, and the flow paths 16 and 17 formed along the sound absorbing materials 13 and 14 to the lower surface of the unit main body 2. Air is supplied to the outside of the unit main body 2 through an opening 18 in the.

In this embodiment, the discharge ports 11 and 12 are provided with damper plates 21 and 21 made of thin aluminum plates, respectively. That is, the packing materials 22 and 22 are provided on the outer peripheral portions of the discharge ports 11 and 12, respectively, and the damper plates 21 and 21 are respectively attached to the unit main body 2 as shown in FIG. The top plate 2a is rotatably provided by a hinge 23.

The first embodiment has the configuration as described above, and the operation status of the discharge port 11 side will be described with reference to FIGS. 4, 5, and 6. First, the fan motor 3 is stopped. At this time, as shown in FIG. 4, the damper plate 21 hangs vertically due to its own weight.

However, when the fan motor 3 is operated to start the discharge of the conditioned air by the fan, as shown in FIG. 5, due to the supply airflow discharged from the flow passage 9 through the discharge port 11, the damper plate 21 is discharged. Opens to the outside and is supplied to the clean room through the flow path 16 as it is. In this case, the inventor proved that the performance of the fan filter unit itself due to the provision of the damper plate 21 at the discharge port 11 was hardly seen.

Further, when the fan motor 3 is stopped and the indoor pressure is high, such as when another fan unit is operating, as shown in FIG. 21 is pushed inward and pressure-bonded to the packing material 22 arranged on the periphery of the discharge port 11, and the discharge port 11 is completely airtightly closed. Therefore, the indoor air does not flow backward from the outlet 11.

Moreover, as is clear from FIG. 1, since the damper plate 21 is housed in the unit main body 2, there is no need for the work of constructing a damper separately as in the conventional case. Even during transportation, if the damper plate 21 is temporarily fixed with tape or the like, there is no risk of damage during transportation.

The damper plate 21 uses a thin aluminum plate as its material in view of its mechanical strength and the fact that it normally hangs vertically due to its own weight and is opened by the air supply when the fan filter unit operates. Further, in order to increase only the strength, or to enhance the sound deadening and damping effect, appropriate ribs may be formed on the damper plate, the sound deadening material may be attached, or the vibration damping steel plate may be used.

In the first embodiment described above, the damper plates 21 are provided in the discharge ports 11 and 12, respectively. However, in the fan unit 1 of the above-described embodiment, in addition to these discharge ports 11 and 12, Discharge openings are formed in the vertical direction by the horizontal projecting ends of the sound absorbing members 13, 14 which are substantially L-shaped on the side surface and the lower surface of the partition plate 15. Therefore, as in the second embodiment shown in FIG. 7, these openings are used as discharge ports 31 and 32, and packing materials 33 and 33 are provided on the outer peripheral edges thereof, respectively. Damper plates 34, 34 that are in close contact with the material 33 may be provided at the discharge ports 31, 32, respectively.

In this case as well, the operation of the damper plates 34, 34 is the same as that of the first embodiment, and the fan motor 3 is operated so that the conditioned air passes through the flow paths 9, 10 as shown in FIG. The damper plates 34, 34 are opened by the wind pressure when passing through the flow paths 16, 17, and the conditioned air is supplied from the unit body 2 into the clean room. Also, when the other fan units operate while the fan unit 1 is stopped and the room pressure in the clean room becomes higher, the pressure causes the damper plates 34, 34 to move toward the packing materials 33, 33 side. And the discharge ports 31 and 32 are airtightly closed. Therefore, the indoor air does not flow backward and flow into the fan unit 1.

Also in the second embodiment as described above, the damper plates 34, 34 are housed in the unit main body 2, and like the first embodiment, there is no need to provide a separate damper and the construction is simple. There is no risk of damage during transportation.

As is apparent from each of the above-described embodiments, according to the present invention, the present invention can be easily applied to a fan unit having a vertical discharge port inside the unit. Further, the fan unit used in each of the above-mentioned embodiments has discharge ports formed in the upper and lower parts of the unit body, and in each of the above-mentioned embodiments, a damper plate is provided separately. In order to achieve this, damper plates may be installed at the upper and lower discharge ports at the same time.

[0021]

[Effect of device]

 According to this invention, when the fan unit is operating to discharge the conditioned air into the room, the damper plate rotates in the air supply direction by the air supply to open the discharge port, which in turn causes the fan unit to move. When stopped, the damper plate is hung vertically due to its own weight, and the discharge port is closed. At this time, if the room pressure becomes higher, the damper plate is pressed against the discharge port side by the pressure at that time, and the discharge plate is completely closed by closely contacting the airtight material arranged on the outer peripheral edge of the discharge port. Backflow of indoor air into the fan unit is prevented.

Moreover, since the damper plate that carries out the above-mentioned action is housed in the unit, there is no need for the work of installing a damper separately as in the prior art, and there is almost no possibility of damage during transportation.

[Brief description of drawings]

FIG. 1 is an explanatory view of a side cross section of a first embodiment.

FIG. 2 is an explanatory diagram of a bottom surface of the first embodiment.

FIG. 3 is a perspective view near a damper plate in the first embodiment.

FIG. 4 is an explanatory view showing a state where a damper plate is drooping in the first embodiment.

FIG. 5 is an explanatory diagram showing a state where the damper plate is opened by the air supply airflow in the first embodiment.

FIG. 6 is an explanatory view showing a state where the damper plate is pressed against the packing material by the indoor pressure in the first embodiment.

FIG. 7 is an explanatory view of a side cross section of the second embodiment.

[Explanation of symbols]

 1 Fan Unit 2 Unit Body 3 Fan Motor 7 Suction Flange 8 Fan Casing 11 Discharge Port 12 Discharge Port 21 Damper Plate 22 Packing Material 23 Hinge

Claims (1)

[Scope of utility model registration request] 1. A fan unit having a discharge port for conditioned air in a vertical direction in the unit, wherein an airtight material is arranged on the outer peripheral edge of the discharge port, and a rotation fulcrum is provided near the upper edge of the discharge port. In addition, a fan unit with a backflow prevention damper, characterized in that a damper plate that covers the discharge port is provided rotatably in the discharge flow direction outside the discharge port.