JPH0732128U - Air pressure regulator for air film structure - Google Patents

Abstract

(57) [Summary] [Object] To provide an air pressure adjusting device for an air film structure, which has a simple structure and is inexpensive. [Structure] An air blower 19 communicating with the film body 2 of the air film structure 1 is provided. By driving the blower 19, the compressed air 3 can be replenished in the film body 2. A diaphragm 30 is provided that is elastically deformed by the air pressure in the film body 2. A deformation detection sensor 31 that detects the amount of deformation of the diaphragm 30 is provided. When it is determined that the deformation amount of the diaphragm 30 is less than or equal to a predetermined minimum amount based on the detection signal of the deformation detection sensor 31, the blower 19 is driven while it is determined that the deformation amount reaches a predetermined maximum amount. At this time, the drive of the blower 19 is stopped.

Description

[Detailed description of the device]

[0001]

[Industrial applications]

 This device is an air film type air arch used for entrance and exit gates in parades and exhibitions, and an air film type air tube used as a structural material for temporary structures. The present invention relates to an air pressure adjusting device for a membrane structure.

[0002]

[Prior art]

 The air film structure has a constant shape and a desired strength by keeping the air pressure in the film body within a predetermined air pressure range.

On the other hand, it is extremely difficult to make the film body completely airtight, and air is constantly leaked from the film body, although it is slight. For this reason, it is required that the amount of leaking air be supplemented with compressed air each time.

Therefore, conventionally, a blower for replenishing the compressed air in the membrane is provided, and power is supplied to the electric motor of the blower via an inverter. On the other hand, the pneumatic pressure for detecting the air pressure in the membrane is the same. In some cases, a detection sensor is provided, and the rotation speed of the electric motor is controlled via the inverter by the detection signal of the air pressure detection sensor. Then, according to this, the replenishment amount of the compressed air in the film body is automatically controlled, and the air pressure in the film body is adjusted within a predetermined air pressure range.

[0005]

[Problems to be solved by the device]

 By the way, depending on the type of the air film structure such as the air beam arch, it may not be necessary to adjust the air pressure in the film body with high accuracy. In this case, if an inverter is provided as in the above conventional configuration, There is a problem that the structure of the device becomes too complicated and expensive.

[0006]

SUMMARY OF THE INVENTION The present invention has been made in view of the above circumstances, and an object thereof is to provide an air pressure adjusting device for an air film structure which has a simple structure and is inexpensive.

[0007]

[Means for Solving the Problems]

 The air pressure adjusting device for an air film structure according to the present invention for achieving the above object is provided with a blower 19 communicating with the film body 2 of the air film structure 1, and by driving the blower 19, the film body is driven. When the compressed air 3 can be replenished into the inside of the membrane 2, a diaphragm 30 that elastically deforms by receiving the air pressure in the film body 2 is provided, and a deformation detection sensor 31 that detects the deformation amount of the diaphragm 30 is provided. When it is determined from the detection signal of the detection sensor 31 that the deformation amount of the diaphragm 30 is less than or equal to a predetermined minimum amount, the blower 19 is driven, while it is determined that the deformation amount reaches a predetermined maximum amount. At this time, the drive of the blower 19 is stopped.

[0008]

[Work]

 The operation of the above configuration is as follows.

The deformation detection sensor 31 determines that air leaks from the inside of the film body 2 and the air pressure inside the film body 2 decreases, and the deformation amount of the diaphragm 30 is equal to or less than a predetermined minimum amount (A). At times, the blower 19 is driven to replenish the film body 2 with the compressed air 3 by the blower 19.

Therefore, the inside of the film body 2 is maintained at a predetermined minimum air pressure or more.

On the other hand, when it is determined that the deformation amount of the diaphragm 30 has reached the predetermined maximum amount (B), such as by supplementing the compressed air 3, the drive of the blower 19 is stopped, and The replenishment of the compressed air 3 into the film body 2 by the blower 19 is stopped.

Therefore, the inside of the film body 2 is suppressed to a predetermined maximum air pressure or less.

Therefore, since the inside of the film body 2 is adjusted to the range of the predetermined air pressure, the air film structure 1 can have a certain shape and a desired strength.

In the above case, the diaphragm 30, the deformation detection sensor 31 that detects the deformation amount of the diaphragm 30, and the detection signal of the deformation detection sensor 31 simply drive and stop the blower 19. Thus, the adjustment of the air pressure inside the film body 2 is achieved.

[0015]

【Example】

 An embodiment of the present invention will be described below with reference to the drawings.

In FIG. 1 and FIG. 2, reference numeral 1 is an air film structure, and this air film structure 1 is a film body 2 which is an air film type air arch used for entrance and exit gates of a parade, and this film body. 2 is provided with an air pressure adjusting device 4 for replenishing the compressed air 3, and the film body 2 is made of a flexible resin sheet.

The air pressure adjusting device 4 has a casing 6 made of sheet metal or resin, and the casing 6 has a cylindrical body 7 with a longitudinal axis and a bottom plate that opens and closes a lower end opening of the cylindrical body 7. 8, an outward flange 9 formed on the upper end of the cylindrical body 7, and a top plate 10 that closes the upper end opening of the cylindrical body 7.

An air supply pipe 12 having a longitudinal axis is attached to the top plate 10, and a valve body 14 for opening and closing an upper end opening 13 of the air supply pipe 12 is provided. The valve body 14 is composed of a valve body 15 made of sheet metal and an elastic body 16 attached to the lower surface of the valve body 15. The valve body 15 is rotatably supported by a pivot shaft 17 whose axis is horizontal with respect to the top plate 10 so that the valve body 14 can be rotated downward and downward. The opening 13 is closed by being pressed against the upper end of the supply pipe 12.

A blower 19 is provided in the casing 6, and the blower 19 is detachably attached to the inner peripheral surface of the cylindrical body 7. The blower 19 is composed of a casing 20, a rotor 21, and an electric motor 22 that drives the rotor 21 to rotate. The discharge port formed in the casing 20 is connected to the lower end of the air supply pipe 12 via an elastic short pipe 23.

An air introducing cylinder 25 is projected from the film body 2, and an end of the air introducing cylinder 25 is detachably attached to the outward flange 9. Then, the blower 19 communicates with the inside of the film body 2 through the air introducing cylinder 25, the air supply pipe 12, and the short pipe 23.

When the electric motor 22 is driven, the pressure of the compressed air 3 discharged from the blower 19 causes the valve body 14 to rotate upward against the air pressure in the film body 2 and the own weight of the valve body 14. The compressed air 3 is moved to sequentially pass through the short pipe 23 and the air supply pipe 12, and the compressed air 3 is replenished in the film body 2 (shown by a chain double-dashed line in FIG. 1).

On the other hand, when the drive of the electric motor 22 is stopped, the pressure of the compressed air 3 against the valve body 14 disappears, while the air pressure inside the film body 2 and the weight of the valve body 14 cause the valve body 14 to rotate downward. Then, the valve body 14 closes the opening 13.

In FIG. 2 and FIG. 3, an air discharge pipe 26 that connects the inside of the air introduction cylinder 25 to the outside of the film body 2 is provided. The air discharge pipe 26 is supported so as to straddle the cylindrical body 7 and the top plate 10, and a manual opening / closing valve 27 is attached to the downstream end of the air discharge pipe 26.

Although the on-off valve 27 is normally closed, the on-off valve 27 is opened when the air pressure in the film body 2 becomes excessive or when the film body 2 is contracted. The air in the film body 2 may be discharged.

In all the drawings, a circular hole 29 is formed in the top plate 10, and a circular diaphragm 30 is provided so as to cover the circular hole 29. The edge of the diaphragm 30 is detachably attached to the opening edge of the circular hole 29 by the flange 28, and the diaphragm 30 has a substantially flat shape in the free state. The central portion of the diaphragm 30 receives the air pressure in the film body 2 and elastically deforms downward.

A deformation detection sensor 31 for detecting the amount of deformation of the diaphragm 30 is provided. The deformation detection sensor 31 is a limit switch, and is composed of a contact portion 32 and a detection arm 33 pivotally supported by the contact portion 32 so as to be vertically rotatable. Normally, the detection arm 33 is moved upward by a spring. It is urged toward.

The deformation detection sensor 31 is detachably supported on the top plate 10 by a sensor support 34 so that its position can be adjusted. The deformation detection sensor 31 is supported by the upper sensor support tool 34 so that the rotation end of the detection arm 33 is in pressure contact with the lower surface of the diaphragm 30 at substantially the center thereof. The detection arm 33 is vertically rotated in accordance with the deformation of the diaphragm 30, is turned on at a predetermined upper rotation position, and is turned off at a predetermined lower rotation position.

Further, a control device 36 for connecting the electric motor 22 of the blower 19 and the deformation detection sensor 31 is provided. 37 is a power supply.

As shown by the solid line in FIG. 4, when the air pressure in the film body 2 is reduced and the elastic deformation amount in the central portion of the diaphragm 30 becomes equal to or smaller than a predetermined minimum amount (A), the deformation detection is performed. The detection arm 33 of the sensor 31 just reaches the predetermined upper rotation position. At this time, the deformation detection sensor 31 is turned on, the electric motor 22 is driven through the control device 36, and the compressed air 3 is replenished into the film body 2 from the blower 19.

As a result, the air pressure inside the film body 2 is increased, and the inside of the film body 2 is maintained at a predetermined minimum air pressure or higher. Further, when the elastic deformation amount in the central portion of the diaphragm 30 reaches a predetermined maximum value (B) due to the increase of the air pressure in the film body 2, the detection arm 33 of the deformation detection sensor 31 is just The predetermined downward rotation position is reached. Then, at this time, the deformation detection sensor 31 is turned off, and the drive of the electric motor 22 is stopped via the control device 36. Then, replenishment of the compressed air 3 into the film body 2 is stopped, and the inside of the film body 2 is suppressed to a predetermined maximum atmospheric pressure or less.

In the above case, the difference (C) obtained by subtracting the minimum value (A) from the predetermined maximum value (B) of the elastic deformation amount and the rotation amount of the detection arm 33 for turning on and off the deformation detection sensor 31. Are consistent with.

The sensor support 34 will be described in more detail with reference to FIGS. 4 to 6.

The sensor support 34 has a base member 41 that is detachably fixed to the top plate 10 with bolts 40. The base member 41 is formed with a pair of vertically elongated straight holes 42, 42. ing.

A vertical adjustment plate 44 is removably attached to the base member 41 by bolts 43 passing through the linear elongated holes 42. That is, if the bolt 43 is loosened, the upper and lower adjusting plates 44 can be adjusted up and down (arrow D in FIG. 4). A pair of arcuate elongated holes 45, 45 extending substantially parallel to the deformed shape of the diaphragm 30 in a side view are formed in the vertical adjustment plate 44. A parallel moving plate 48 is detachably attached to the vertical adjusting plate 44 by a bolt 47 passing through each of the arcuate elongated holes 45. That is, if the bolt 47 is loosened, the translation plate 48 can be translated along the arcuate elongated hole 45 (arrow E in FIG. 4).

A pivot plate 50 is rotatably supported by a pivot shaft 49 with respect to the parallel displacement plate 48. A screw jack 52 is attached to the parallel movement plate 48, and the screw jack 52 and the pivot support plate 50 are connected by a link 53. That is, if the screw jack 52 is screwed, the pivot plate 50 can be adjusted in angle around the pivot shaft 49 (arrow F in FIG. 4).

A support base 54 is provided so as to project from the pivot plate 50, and the deformation detection sensor 31 is detachably screwed to the protruding end of the support base 54 with a bolt 55.

The vertical adjustment plate 44 adjusts the deformation detection sensor 31 up and down, the parallel movement plate 48 adjusts the position of the deformation detection sensor 31 along the lower surface of the diaphragm 30, and the screw jack 52 is operated. By adjusting the angle of the deformation detecting sensor 31 by rotating the pivot plate 50, the rotating end of the detecting arm 33 can be brought into contact with the lower surface of the diaphragm 30 under various conditions.

In the above case, as shown in FIG. 4, the value of the difference (C) of the diaphragm 30 becomes gradually smaller toward the radially outer end side of the diaphragm 30. On the other hand, the amount of rotation of the detection arm 33 for turning on and off the deformation detection sensor 31 is unchanged.

Therefore, it is assumed that the parallel displacement plate 48 adjusts the position of the deformation detection sensor 31 along the lower surface of the diaphragm 30 to the radially outer end side of the diaphragm 30, for example. Then, in this case, the deformation detection sensor 31 does not turn on or off unless the difference (C 1) in the deformation amount of the diaphragm 30 becomes considerably large. Therefore, the range from the minimum air pressure to the maximum air pressure in the film body 2 can be increased. That is, if the deformation detection sensor 31 is moved and adjusted in the radial direction of the diaphragm 30, the range of the minimum and maximum air pressures in the film body 2 can be expanded / contracted.

Although the above is based on the illustrated example, the air film structure 1 is not limited to the entrance / exit gate shown in this embodiment, and may be a baseball field dome or the like. Further, the deformation detection sensor 31 may be a photo sensor or a proximity switch. Further, the opening / closing valve 27 may be automatically opened when the inside of the film body 2 has a predetermined pressure or more.

[0041]

[Effect of device]

 According to the present invention, in the air pressure adjusting device for an air film structure, which is provided with a blower communicating with the air film structure, the compressed air can be replenished into the film body by driving the air blower. A diaphragm that is elastically deformed by the air pressure inside the body is installed, and a deformation detection sensor that detects the amount of deformation of this diaphragm is installed, and the same as above. When the blower is turned off, the blower is driven, and when it is determined that the deformation amount reaches a predetermined maximum amount, the blower is stopped.

Therefore, when the deformation detection sensor determines that the amount of deformation of the diaphragm is less than or equal to a predetermined minimum amount due to air leaking out from the inside of the film, the air pressure inside the film falls, and the blower is driven. Then, the blower replenishes the film body with compressed air.

Therefore, the inside of the film body is maintained at a predetermined minimum air pressure or higher.

On the other hand, when it is determined that the amount of deformation of the diaphragm has reached a predetermined maximum amount, such as by supplementing the compressed air, driving of the blower is stopped, and the blower moves into the membrane body. The replenishment of compressed air is stopped.

Therefore, the inside of the film body can be suppressed to a predetermined maximum air pressure or less.

Therefore, since the inside of the film body is adjusted to the range of the predetermined air pressure, the air film structure has a certain shape and a desired strength.

In the above case, with the diaphragm, the deformation detection sensor that detects the deformation amount of the diaphragm, and the simple configuration in which the blower is simply driven and stopped by the detection signal of the deformation detection sensor, Since the adjustment of the air pressure is achieved, the air film structure has a simple structure and is inexpensive.

[Brief description of drawings]

FIG. 1 is an overall side sectional view.

FIG. 2 is an overall plan view.

3 is a sectional view taken along the line 3-3 of FIG.

FIG. 4 is a partially enlarged view of FIG.

5 is a partially enlarged view of FIG.

FIG. 6 is a perspective development view of the sensor support.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 Air film structure 2 Film body 3 Compressed air 4 Air pressure adjusting device 19 Blower 26 Air discharge pipe 27 Opening / closing valve 30 Diaphragm 31 Deformation detection sensor 34 Sensor support 36 Control device

Claims (1)

[Scope of utility model registration request] 1. An air pressure adjusting device for an air film structure, wherein an air blower communicating with the air film structure is provided, and compressed air can be replenished into the film body by driving the air blower. A diaphragm that is elastically deformed by receiving air pressure is provided, and a deformation detection sensor that detects the deformation amount of this diaphragm is provided.When the deformation amount of the diaphragm is determined to be equal to or less than a predetermined minimum amount by the detection signal of the deformation detection sensor, An air pressure adjusting device for an air film structure, which drives the blower while stopping the drive of the blower when it is determined that the amount of deformation reaches a predetermined maximum amount.