JP5394274B2 - Airtight damper - Google Patents

Description

  The present invention relates to a highly airtight damper provided in a ventilation duct of a building.

  For example, in order to keep clean rooms such as hospitals and laboratories clean, the communication between the clean room and the outside is airtightly isolated, and toxic gases such as formalin after fumigating the animal laboratory are prevented from diffusing. Therefore, in order to airtightly isolate the communication between the animal laboratory and the outside, a highly airtight damper is used in a ventilation duct that communicates the clean room or the animal laboratory with the outside.

  Conventionally, what is indicated by patent documents 1 mentioned below is known as a damper which partitions off a clean room and the exterior.

Japanese Utility Model Publication No. 6-22849

  By the way, the damper disclosed in Patent Document 1 is provided with a frame in an opening communicating with a ventilation duct, a ventilation hole is opened in the frame, and one end of an opening / closing plate that opens and closes the ventilation hole is attached to the frame with a support shaft. The flap portion (tip portion) of the opening / closing plate is supported so as to be movable, and is seated on the ventilation hole of the frame to shield the ventilation hole.

By the way, with such a conventional damper,
(1) Since a frame for supporting the opening and closing plate is provided in the opening communicating with the ventilation duct, the effective ventilation cross-sectional area of the ventilation duct is reduced by this frame, and the ventilation air volume is reduced.

  (2) Since one end of the opening / closing plate is supported by the frame, the opening / closing torque of the opening / closing plate increases.

  (3) Since the seal between the opening and closing plate and the air hole is not sufficient, the airtight performance is poor and the pressure loss is large.

(4) Since the air in the ventilation direction urges the opening / closing plate to close to increase the air density, the ventilation direction is limited to one direction.
There are problems such as.

  The present invention has been made in view of such circumstances, and it is possible to suppress a decrease in the effective ventilation cross-sectional area of the ventilation duct to secure a desired ventilation air volume and to enhance a sealing function between the movable blade and the ventilation hole, thereby improving the sealing performance and pressure loss. An object of the present invention is to provide a new highly airtight damper that can improve performance and has reversibility in the direction of ventilation.

In order to achieve the above-mentioned object, the invention according to claim 1 is characterized in that a central portion is provided on a rectangular tube-shaped casing having an air passage having a square passage cross-sectional shape, and a blade shaft that is rotatably mounted in the air passage. A highly movable airtight damper having a rectangular movable blade that is fixed and capable of opening and closing the air passage, and a sealing means that hermetically seals the inside of the air passage when the movable blade is closed,
The sealing means includes a gasket attached to the outer peripheral edge of the movable blade so as to trim the entire circumference, and a lip piece is integrally formed at a free end of the seal portion of the gasket, At the corners, the ridges project outwards together,
On the other hand, a square mounting rib that pivotally supports the movable blade is integrally provided in the casing, and a lip pressure contact surface that inclines upwardly toward the closing direction of the movable blade on the upper and lower inner surfaces of the mounting rib. Are formed on the left and right inner surfaces, and when the movable blade is fully closed, the upper and lower sides of the lip piece are pressed against the lip pressure contact surface and the left and right sides are lip. It is characterized in that it is brought into close contact with the sliding surface and its four shape parts are in close contact with the four corners of the mounting rib.

  In order to achieve the object, the invention according to claim 2 is the one according to claim 1, wherein the gasket is made of ethylene-coated ethylene sponge, and is attached to the movable blade. It is characterized by comprising a seal portion having an arrow cross section formed integrally with the base end portion, and a lip piece having a triangular cross section formed integrally with the tip of the seal portion.

  In order to achieve the above object, according to a third aspect of the present invention, in the first or second aspect of the present invention, the movable blade is integrally joined with two blade plates in a space. It is characterized by being formed in a sealed hollow shape.

  Furthermore, in order to achieve the object, the invention according to claim 4 is the one according to claim 1, 2, or 3, wherein the movable blade is at least an upstream surface facing the upstream side of the airflow flowing through the ventilation path. Further, a dew condensation prevention material is provided.

  According to the invention of each claim, in the high airtight damper provided in the ventilation duct, it is possible to ensure high sealing performance and pressure loss performance by the sealing means provided in the movable blade that opens and closes the ventilation path in the casing. In addition, it is possible to suppress a reduction in the amount of air flow by preventing the effective ventilation cross-sectional area of the ventilation duct from being reduced. Furthermore, the present invention can be applied to the case where the air flow flowing through the ventilation path is in one direction or the other direction, that is, the reversible damper can be used.

  According to the second aspect of the present invention, the gasket constituting the sealing means is made of silicon-coated ethylene sponge, and a lip piece is formed at the tip of the sealing portion, so that the movable blade is fully closed for a long time. Even if it remains in the state, it does not remain attached to the ventilation path, and the portion that repeatedly comes into pressure contact is a lip piece, so durability against repeated operations is enhanced.

  Further, according to the third aspect of the present invention, since the movable blade is formed in a sealed hollow shape, the movable blade is lightweight, and smooth opening / closing is ensured and its opening / closing torque is reduced.

  Furthermore, according to the fourth aspect of the present invention, condensation of the movable blade can be prevented.

Perspective view of fully airtight damper fully open Sectional view along line 2-2 in FIG. Sectional view along line 3-3 in FIG. Partial view along line 4-4 in FIG. The same cross-sectional view as in Fig. 2 in the fully closed state of the highly airtight damper Sectional drawing which follows the 6-6 line of FIG. Sectional view same as FIG. 5 according to the second embodiment of the present invention.

  Embodiments of the present invention will be specifically described below based on the embodiments of the present invention illustrated in the accompanying drawings.

  First, a first embodiment of the present invention will be described with reference to FIGS.

  The highly airtight damper DA according to the present invention is connected to a ventilation duct DU formed in a building, and is used to hermetically shield an air flow flowing through the ventilation duct DU.

  As shown in FIGS. 1 to 3, the casing 1 of the highly airtight damper DA is configured in a rectangular tube shape, and the ventilation path 2 is formed in the inside thereof in a quadrangular cross section. An inflow port 3 and an outflow port 4 are opened on the front and rear surfaces of the casing 1. Around the front surface and the rear surface of the casing 1, front and rear mounting flanges 5, 6 each having a plurality of mounting holes 7 are integrally projected, and these mounting flanges 5, 6 are connected to the ventilation duct DU. Connected integrally to the connection flange f, the ventilation path 2 in the casing 1 communicates with the ventilation duct DU.

  A square frame-shaped mounting rib 8 is integrally provided at an intermediate portion of the inner surface of the casing 1 in the front-rear direction. As shown in FIGS. 1 and 3, the left and right inner surfaces of the mounting rib 8 are formed on the lip sliding contact surfaces 8a and 8a that are parallel to each other and are flat over the entire length in the vertical direction. The 17 lip pieces 17c are in sliding contact with each other in an airtight manner. The upper and lower inner surfaces of the mounting rib 8 are formed with lip pressure contact surfaces 8b, 8b, which are inclined surfaces that are inclined upwardly toward the front in the closing direction of the movable blade 13, as shown in FIGS. When the movable blade 13 is closed (see FIG. 5), the lip piece 17c of the gasket 17 is in close pressure contact.

  A blade shaft 10 disposed horizontally in the casing 1 is rotatably supported via bearings 11 and 12 at the upper and lower intermediate portions of the left and right sides of the mounting rib 8. An intermediate portion of the blade 13 is fixed with a screw 16.

  The movable blade 13 has two square blade plates 13a and 13b made of hot dip galvanized steel plates facing each other with a gap c therebetween, and a plurality of connecting bolts 14 fixed to one blade plate 13b are connected to the other blade. By passing through the plate 13a and screwing the nuts 15 to these connecting bolts 14, the two blade plates 13a and 13b are fixed together with a gap c therebetween. As shown in FIG. 2, the intermediate portion of the two blade plates 13 a and 13 b is formed in an arc shape so as to sandwich the blade shaft 10 from above and below, and is fixed to the blade shaft 10 with a plurality of screws 16. Yes. And the movable blade | wing 13 is formed lightweight by the space | gap c being formed in an inside.

  The outer peripheral edge of the movable blade 13 is provided with sealing means S that shields the ventilation path 2 when the movable blade 13 is fully closed. The sealing means S is composed of a flexible and elastic gasket 17 fixed so as to border the entire circumference of the movable blade 13, and the gasket 17 is made of ethylene-coated ethylene sponge and has a rectangular frame. The base end portion 17a is flat and has a flat cross section, and a seal portion 17b having an arrow cross section formed integrally with the outer periphery thereof. The base end portion 17a has two blades of the movable blade 13. A lip piece 17c is integrally formed in a triangular shape at the free end of the seal portion 17b. As shown in FIG. 3, at the four corners of the lip portion 17c of the square gasket 17, two shape portions 17d, which are longer than the other portions, are integrally projected outwardly. When the movable blade 13 is closed, the shape portions 17d are in close contact with the four corners of the mounting rib 8 so as to prevent leakage of ventilation from those corners.

  A stopper 19 for locking the movable blade 13 at the closed position is provided on the lower side of the mounting rib 8. The stopper 19 is formed of a bolt screwed into a mounting piece 20 fixed to the mounting rib 8 so as to be able to advance and retreat, and the fully closed position of the movable blade 13 can be adjusted.

  An air volume adjusting device 22 that adjusts the air volume of the airflow flowing through the ventilation path 2 by adjusting the movable blade 13 to open and close is provided on one outer surface of the casing 1. The air volume adjusting device 22 includes a housing 23 fixed to one outer surface of the casing 1, and one end of the blade shaft 10 passes through the housing 23 and a motor 24 that rotationally drives the blade shaft 10. Provided.

  As shown in FIG. 4, the housing 23 is provided with a display unit 25 that indicates the opening degree of the movable blade 13. The pointer 25a of the display unit 25 displays the fully closed and fully opened movable blades 13 and the opening position between them.

  Next, the operation of the first embodiment shown in FIGS. 1 to 6 will be described.

  As shown in FIGS. 1 to 3, when the movable blade 13 of the highly airtight damper DA is in the fully open position, the blade shaft 10 is substantially parallel to the upper and lower surfaces of the ventilation path 2, and the air flow flowing through the ventilation duct DU As shown by the arrow a, the air flows through the ventilation path 2 in the casing 1 from the upstream side to the downstream side. At this time, the passage cross-sectional area of the ventilation passage 2 is hardly restricted, and the seal portion 17b of the gasket 17 provided on the outer peripheral edge of the movable blade 13 is formed in the shape of an arrow in the cross section. The air flow flowing through 2 can be divided up and down and smoothly circulated with little resistance, and the ventilation resistance of the air flow can be reduced.

  Further, by the rotation control of the motor 24, the movable blade 13 rotates together with the central blade shaft 10 to adjust the opening degree of the ventilation path 2, and in combination with the hollowness, the movable blade 13 is compared with the known one. Reduction of rotational torque can be achieved.

  Further, as shown in FIG. 5, the movable blade 13 can be brought into the fully closed state by rotating approximately 90 ° from its fully opened state and abutting against the stopper 19 by rotation control of the motor 24.

  When the movable blade 13 is fully closed, the left and right sides of the lip piece 17c of the gasket 17 are in airtight contact with the left and right flat lip sliding surfaces 8a and 8a of the mounting rib 8, as shown in FIG. Further, as shown in FIG. 5, the upper and lower sides of the lip piece 17c are in close pressure contact with the upper and lower lip pressure contact surfaces 8b, 8b formed by the inclined surfaces of the mounting rib 8 of the casing 1, and further as shown in FIG. Further, the four corners 17d of the gasket 17 bend and tightly adhere to the four corners of the mounting rib 8 of the casing 1 without a gap. At this time, as shown in FIG. 5, only the lip piece 17c of the gasket 17 bends and comes into sliding contact with the lip sliding contact surfaces 8a and 8a and tightly adheres to the lip pressing contact surfaces 8b and 8b. As compared with the case where the bend is bent, the torque at the time of closing can be reduced, and the durability of the gasket 17 is enhanced.

  Therefore, in the fully closed state of the movable blade 13, the ventilation path 2 of the casing 1 can be airtightly and accurately blocked by the gasket 17 of the movable blade 13 to prevent the flow of ventilation, and the closing torque can be reduced. Can be reduced. Further, the gasket 17 is formed of silicon-coated ethylene rubber, and only the lip piece c bends. Therefore, even if the movable blade 13 remains fully closed for a long time, it is difficult to separate from the mounting rib 8. There is nothing.

  Further, since the upper and lower lip pressure contact surfaces of the mounting rib 8 are made of inclined surfaces in the vertical direction, moisture such as rain attached thereto does not stay.

  Furthermore, this highly airtight damper can cope with the case where the airflow flowing through the ventilation duct DU flows in the reverse direction in the ventilation path 2, that is, from the downstream side to the upstream side (the direction opposite to the direction of arrow a in FIG. 5). Therefore, it can be used as a reversible damper.

  Next, a second embodiment of the present invention will be described with reference to FIG.

  In the second embodiment, the movable blade 13 is provided with dew condensation prevention means. Specifically, the movable blade 13 has an upstream surface facing the upstream side of the airflow flowing through the ventilation path 2. A flocking 30 for preventing condensation is applied.

  Thereby, even when the temperature of the airflow flowing into the ventilation path 2 is lower than the temperature of the downstream airflow, the movable blade 13 is not condensed.

  In the second embodiment, the flocking preventing hairs 30 may be applied to both the upstream surface and the downstream surface of the movable blade 13.

  As mentioned above, although the Example of this invention was described, this invention is not limited to the Example, A various Example is possible within the scope of the present invention.

  For example, in the embodiment, one movable blade 13 is provided in the casing 1 so as to be openable and closable, but a plurality of movable blades 13 may be provided in the casing 1 so as to be openable and closable. These movable blades 13 can be opened and closed in synchronization by a single motor 24. In the above embodiment, the movable blade 13 is opened and closed by the motor 24. However, the movable blade 13 may be opened and closed manually.

DESCRIPTION OF SYMBOLS 1 ... Casing 2 ... Ventilation path 8 ... Installation rib 8a ... Lip sliding surface 8b ... ··· Lip pressure contact surface 10 ······ Blade axis 13 ··· Movable blades 13a and 13b · · · Blade plate 17a ········ Base end portion 17b ··· .... Seal part 17c .... Lip part 17d .... One part 30 ... ... Condensation prevention member (flocking)
S ... Sealing means c ... Air gap

Claims (4)

The central part is fixed to a rectangular tube-shaped casing (1) having a square air passage (2) in the cross-sectional shape of the passage, and a blade shaft (10) that is rotatably mounted in the air passage (2). A rectangular movable blade (13) capable of opening and closing the ventilation path (2) and a sealing means (S) for hermetically sealing the inside of the ventilation path (2) when the movable blade (13) is closed. High airtight damper,
The sealing means (S) includes a gasket (17) attached to the outer peripheral edge of the movable blade (13) so as to edge the entire periphery, and is provided at the free end of the seal portion (17b) of the gasket (17). The lip piece (17c) is integrally formed, and at the four corners of the lip piece (17c), one shape portion (17d) projects integrally outward,
On the other hand, a square mounting rib (8) that pivotally supports the movable blade (13) is integrally provided in the casing (1), and the movable blade (13) is formed on the upper and lower inner surfaces of the mounting rib (8). ) And a lip sliding contact surface (8a) parallel to each other is formed on the left and right inner surfaces thereof.
When the movable blade (13) is fully closed, the upper and lower sides of the lip piece (17c) are brought into pressure contact with the lip pressure contact surface (8b), and the left and right sides thereof are in close contact with the lip slide contact surface (8a). A highly airtight damper, characterized in that the two shaped portions (17d) are in close contact with the four corners of the mounting rib (8), respectively.   The gasket (17) is made of ethylene-coated ethylene sponge, and has a base end (17a) attached to the movable blade (13) and a seal having an arrow cross section formed integrally with the base end (17a). The highly airtight damper according to claim 1, wherein the lip piece (17c) is formed integrally with a lip piece (17c) having a triangular section at the tip of the seal part (17b).   The movable blade (13) is formed in a sealed hollow shape by integrally joining two blade plates (13a, 13b) with a gap (c) therein. Item 3. The highly airtight damper according to Item 1 or 2.   The said movable blade | wing (13) is provided with the dew condensation prevention material (30) in the upstream surface which faces the upstream of the airflow which flows through the said ventilation path (2) at least. Or the high airtight damper of 3.

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