JP2011112234A - Air volume control device - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide an air volume control device capable of preventing breakage by firmly fixing a damper blade while ensuring airtightness. <P>SOLUTION: A split damper 1 is disposed on a branch section of a main duct 100 and a branch duct 102 in a state that a blade shaft 12 is positioned at a main duct 100 side, and an opening adjustment shaft 13 is positioned at a branch duct 102 side. An operator rotates a handle 16 to keep the damper blade 11 at a desired angle while confirming an angle display section disposed on a blade shaft rotating means 15, to adjust a cross-section of an air trunk to the branch ducts 102a, 102b. The opening adjustment shaft 13 is held in a slot 14a, and the damper blade 11 is held by the blade shaft 12 and the opening adjustment shaft 13. Thus, vibration of the damper blade 11 is suppressed, and the breakage of the blade shaft 12 and the damper blade 11 can be prevented. Further, as a part between the blade shaft 12 and a hole 10b is sealed by an elastic body, high airtightness can be ensured. <P>COPYRIGHT: (C)2011,JPO&INPIT

Description

  The present invention relates to an air volume adjusting device, and more particularly to an air volume adjusting device capable of adjusting an air flow rate from a main duct to a branch duct.

  Patent Document 1 discloses a guide vane (damper blade) provided at a joint portion between a main duct and a plurality of branch ducts. This guide vane is provided with a rotation shaft at the end of the guide vane on the main duct side, and the axis of the rotation shaft is provided so as to match or be parallel to the boundary line between the branch ducts. In addition, the guide vane is provided with a drive portion that protrudes outside the main duct at the other end of the guide vane that draws an arcuate trajectory. Is oscillated in the main duct to change the partition angle. Therefore, according to this guide vane, when the partition angle is changed to reduce or increase the air passage cross section to one branch duct, the air passage cross section to the other branch duct changes in inverse proportion to this. Therefore, the amount of air blown to the branch duct is distributed.

  In the invention described in Patent Document 1, the arc-shaped elongated hole for adjusting the position of the guide vane is closed using an elastic body such as rubber. However, there has been a problem that an elastic body such as rubber deteriorates with time and it is difficult to maintain airtightness. Therefore, the invention described in Patent Document 1 is not suitable for application to an air path including radioactive dust.

  Moreover, as shown in FIGS. 6 and 7, an air volume adjusting device 110 that changes the angle of the damper blade 111 using an opening adjustment shaft 113 is used as another type of air volume adjusting device. FIG. 6 is a side sectional view of the air volume adjusting device 110 including the main duct 100 and the branch duct 102. 7A is a front view of the air volume adjusting device 110, and FIG. 7B is a side view of the connecting duct 100A in which the air volume adjusting device 110 is attached to the connecting duct 100A constituting a part of the main duct 100. FIG.

  The air volume adjusting device 110 includes a plate-like damper blade 111, and at one end of the damper blade 111, a blade shaft 112 that allows the damper blade 111 to rotate around its end surface is provided. On the lower surface of the damper blade 111, a plurality of (for example, two) opening adjustment shafts 113 for setting the opening of the damper blade 111 are provided in a direction perpendicular to the blade shaft 112. The opening adjustment shaft 113 is disposed through the opening on the lower surface of the connecting duct 110A, and the angle of the damper blade 111 can be adjusted by moving the opening adjustment shaft 113 up and down. After adjusting the angle of the damper blade 111, the opening adjusting shaft 113 and the connecting duct 100A are fixed by the set screw 114 and welding. Thereby, the damper blade | wing 111 is fixed.

  In the air volume adjusting device 110, a hole for penetrating the opening adjusting shaft 113 is formed on the lower surface of the connecting duct 100A. However, in the air volume adjusting device 110, the damper blade 111 is weakly fixed because the damper blade 111 is cantilever supported only by the blade shaft 112. Therefore, when a high wind pressure is applied to the damper blade 111, the damper blade 111 vibrates and the vibration is transmitted to the opening adjustment shaft 113, thereby affecting the operation.

JP-A 61-205747

  The present invention has been made in view of such circumstances, and an object thereof is to provide an air volume adjusting device that can securely fix a damper blade at a desired angle while ensuring airtightness.

  In order to achieve the above object, an air volume adjusting device according to the present invention is an air volume adjusting device provided on the main duct side of a connecting portion between a main duct and a branch duct, comprising a plate-like damper blade, and the damper. A rotating shaft provided at one end of both side surfaces of the blade and disposed through the main duct, an opening degree adjusting shaft provided at the other end portion of both side surfaces of the damper blade, and the rotating shaft And a guide plate provided on the inner wall portion of the main duct and having an arc-shaped long hole that is slid with the opening adjustment shaft fitted and slid with a distance between the opening adjustment shaft and the opening adjustment shaft. It is characterized by that.

  According to the air volume adjusting device of the present invention, the rotation shaft provided at one end of the both side surfaces of the damper blade is disposed through the main duct. Thereby, a rotating shaft is provided rotatably with respect to the main duct. Therefore, by rotating the rotation shaft, the guide blade can be adjusted to an arbitrary position, the cross section of the air passage to the branch duct can be changed, and the air volume to each branch duct can be adjusted. In addition, since the main duct is only formed with a hole through which the rotation shaft is inserted, airtightness can be ensured by using a known sealing method or the like. Therefore, it is possible to prevent radioactive dust from leaking to the outside.

  Further, according to the air volume adjusting device of the present invention, the opening adjustment shaft is provided at the other end of each side surface of the damper blade, and the substantially circular arc shape whose radius is the distance between the rotation shaft and the opening adjustment shaft. A guide plate in which a long hole is formed is provided on the inner wall portion of the main duct, and an opening adjusting shaft is fitted into the long hole and is slid. Thereby, since the damper blade is supported at both ends by the rotation shaft and the opening adjustment shaft, the damper blade can be reliably fixed at a desired angle.

  It is desirable that the air volume adjusting device of the present invention includes a rotating means connected to an end of the rotating shaft. Thereby, a damper blade | wing can be adjusted to a desired angle by a rotation means.

  In the air volume adjusting device of the present invention, the rotation means is rotation transmission means having two output shafts orthogonal to each other, and one output shaft of the two output shafts is the rotation shaft. A rotation transmission means coupled to the other, and a handle coupled to the other output shaft of the two output shafts, the handle extending downward from the rotation transmission means. It is desirable to have.

  According to the air volume adjusting device of the present invention, the rotation shaft is connected to one of the two output shafts of the rotation transmission means having two orthogonal output shafts, and the other one A handle is connected to the output shaft. Thereby, the rotating shaft can be rotated by rotating the handle, and the guide blade can be adjusted to an arbitrary position.

  The air volume adjusting device of the present invention preferably includes fixing means for fixing the rotating shaft at a desired position. Thereby, a damper blade | wing can be reliably fixed in the position after adjustment.

  In the air volume adjusting device of the present invention, the air volume adjusting device has two guide plates, the main duct has a substantially rectangular shape in cross section, and the two guide plates are respectively provided on both side surfaces of the main duct. It is desirable to be provided.

  In the air volume adjusting device of the present invention, it is preferable that a seal member is provided in the long hole, and the opening adjustment shaft is fitted into the long hole via the seal member.

  According to the air volume adjusting device of the present invention, by providing an elastic member between the long hole and the opening adjustment shaft, the opening adjustment shaft can be slid within the long hole and the opening adjustment shaft is long. It can be prevented from moving in the hole. Therefore, vibration of the damper blade can be reliably suppressed.

  In the air volume adjusting device of the present invention, the rotation shaft is disposed on an extension line of the boundary surface of the branch duct.

  According to the air volume adjusting device of the present invention, since the rotating shaft, that is, one end of the damper blade is located on the extension line of the boundary surface of the branch duct, the air volume from the main duct to each branch duct is adjusted more effectively. be able to.

  ADVANTAGE OF THE INVENTION According to this invention, a damper blade | wing can be reliably fixed to a desired angle, ensuring airtightness.

1 is a side sectional view of a split damper 1 according to a first embodiment of the present invention including a main duct 100 and a branch duct 102. FIG. 2 is a perspective view of a main part of the split damper 1. FIG. 1 is a front view of a split damper 1. FIG. 2 is a side view of the split damper 1. FIG. It is a perspective view of a damper blade | wing. It is a sectional side view of the conventional air volume adjusting device. (A) is a front view of the conventional air volume adjusting device, (b) is a side view of the connecting duct to which the air volume adjusting device is attached.

  DESCRIPTION OF EMBODIMENTS Hereinafter, preferred embodiments of an air volume adjusting device according to the present invention will be described with reference to the accompanying drawings. In the present invention, an air volume adjusting device provided in an exhaust duct in a nuclear power plant will be described as an example. The air volume adjusting device is a device that adjusts the air volume to each branch duct when the ventilation air conditioning system duct branches, and is a concept including a split damper, a guide vane, and the like.

  FIG. 1 is a side sectional view of the split damper 1 including a main duct 100 and a branch duct 102. 2 is a perspective view of a main part of the split damper 1, FIG. 3 is a front view of the split damper 1, and FIG. 4 is a diagram illustrating the split damper 1 attached to a connecting duct 100A constituting a part of the main duct 100. It is a side view of connecting duct 100A.

  As shown in FIGS. 1 to 4, the split damper 1 mainly includes a damper blade 11, a blade shaft 12, an opening adjustment shaft 13, an opening adjustment shaft guide 14, a blade shaft rotating means 15, and a handle. 16. The damper blade 11, the blade shaft 12, the opening adjustment shaft 13, and the opening adjustment shaft guide 14 are provided inside the connecting duct 100A, and the blade shaft rotating means 15 is provided outside the connecting duct 100A.

  The main duct 100 and the branch duct 102 are ducts having a substantially rectangular cross section called a square duct, and have a width of about 1 m. The main duct 100 and the branch duct 102 exhaust air containing radioactive dust. The main duct 100 is branched into two by branch ducts 102a and 102b. On the end surfaces of the main duct 100 and the branch duct 102, flanges (not shown) for attaching the connecting duct 100A are formed.

  The connecting duct 100 </ b> A is a cylindrical member having a cross-sectional shape substantially the same as the cross section of the main duct 100 and the branch duct 102, and constitutes a part of the main duct 100. Flange 10a is formed on both end faces of connecting duct 100A, and connecting duct 100A is connected to main duct 100 by connecting flange 10a formed on a desired end face with the flange of main duct 100. Further, the flange 10a formed on the other end face is coupled to the flange of the branch duct 102, whereby the connection duct 100A is connected to the branch duct.

  Holes 10b through which the blade shaft 12 is disposed are coaxially formed on both side surfaces of the connecting duct 100A. A bearing 10c is provided on the outer side of the connecting duct 100A coaxially with the hole 10b. When the split damper 1 is attached to the branch duct 10, the hole 10b and the bearing 10c are provided so as to be positioned on the extension line of the boundary surface between the branch duct 102a and the branch duct 102b. A flange 10d for fixing the handle 16 is formed at the lower right corner of the connecting duct 100A.

  The damper blade 11 is a plate-like member for adjusting the air flow rate of the branch ducts 102a and 102b, and is formed so that the front and rear ends are R-shaped curved surfaces as shown in FIG. Near the rear ends of both side surfaces of the damper blade 11, blade shafts 12 that allow the damper blade 11 to rotate are provided coaxially. In the vicinity of the front ends of both side surfaces of the damper blade 11, opening adjustment shafts 13 are provided coaxially.

  The blade shaft 12 is a steel bar having a diameter of about 12 mm. One end of each of the two blade shafts 12 is fixed to both side surfaces of the damper blade 11. Thereby, the blade shaft 12 and the damper blade 11 are integrally formed. The other end of the blade shaft 12 passes through the hole 10b of the connecting duct 100A and is inserted into the bearing 10c. As a result, the blade shaft 12 and the damper blade 11 can rotate with respect to the connecting duct 100A. The blade shaft rotating means 15 is connected to the end portion of the blade shaft 12 protruding from the connecting duct 100 </ b> A and the end portion of the blade shaft 12 provided on the right side surface of the damper blade 11.

  The opening adjustment shaft 13 is a rod having a diameter of about 12 mm. One end of each of the two opening adjustment shafts 13 is fixed to the damper blade 11. Thereby, the opening adjusting shaft 13 and the damper blade 11 are integrally formed. The other end of the opening adjustment shaft 13 is fitted into a long hole 14a (described later) of the opening adjustment shaft guide. Since the distance between both ends of the opening adjustment shaft 13 on the side not provided on the damper blade 11 is several mm smaller than the inner width of the connecting duct 100A, the damper blade 11 may rotate inside the connecting duct 100A. it can.

  The opening adjustment shaft guide 14 is a substantially rectangular plate-like member having a thickness of about 10 mm, and is provided inside the left and right side surfaces of the connecting duct 100A. Since the distance between the two opening adjustment shaft guides 14 is several mm larger than the width of the damper blades 11, the damper blades 11 can rotate inside the two opening adjustment shaft guides 14.

  The opening adjustment shaft guide 14 is formed with an arc-shaped long hole 14 a having a radius as a distance between the opening adjustment shaft 13 and the blade shaft 12. The width of the long hole 14 a is formed to be several mm larger than the diameter of the opening adjustment shaft 13. The two opening adjustment shaft guides 14 are provided at positions where the opening adjustment shaft 13 can be fitted into the long hole 14a and can slide when the damper blade 11 rotates about the blade shaft 12, respectively. Thereby, even when the damper blade 11 is rotated, the opening adjustment shaft 13 is held in the long hole 14 a, and the damper blade 11 is held by the blade shaft 12 and the opening adjustment shaft 13. That is, the damper blade 11 is supported at both ends.

The diameter of the opening adjustment shaft 13, the material and thickness of the opening adjustment shaft guide 14, and the width of the long hole 14a are set as follows, for example, according to the wind speed in the main duct 100. This is because as the wind speed increases, the force applied to the damper blade 11 increases, and thus the force applied to the opening adjustment shaft also increases.
(1) When the wind speed is 10 m / s or less or the static pressure is 980 Pa or less The diameter of the opening adjustment shaft 13: φ12.7 mm
Opening adjustment shaft guide 14 material: SS400
Plate thickness of opening adjustment shaft guide 14: 9 mm
The width of the long hole 14a: 18 mm
(2) When the wind speed is 10 m / s or more or the static pressure is 980 Pa or more Diameter of the opening adjustment shaft 13: φ20 mm
Opening adjustment shaft guide 14 material: SS400
Plate thickness of opening adjustment shaft guide 14: 9 mm
The width of the long hole 14a: 18 mm
Thus, by varying the diameter of the opening adjustment shaft 13, the plate thickness of the opening adjustment shaft guide 14, and the width of the long hole 14 a depending on the wind speed, the vibration of the damper blade 11 can be reliably suppressed, Damage to the damper blade 11 can be prevented.

  The blade shaft rotating means 15 is a gear box having two orthogonal axes, and a power transmission mechanism having a self-locking mechanism such as a bevel gear, a worm gear, or a hypoid gear is provided inside. One of the two shafts is connected to the shaft of the handle 16. Thereby, rotation of the shaft of the handle 16 can be transmitted to another shaft. The power transmission mechanism includes a ratchet mechanism, a one-way clutch, and the like, and is configured to be rotatable only in a predetermined direction. Therefore, even when a shaft not connected to the shaft of the handle 16 is rotated, the shaft connected to the shaft of the handle 16 is not rotated.

  The other one of the two shafts of the blade shaft rotating means 15 is connected to the blade shaft 12. When the operator rotates the handle 16, the blade shaft rotating means 15 transmits the rotation of the handle 16 to the blade shaft 12 and rotates the blade shaft 12. As a result, the damper blade 11 is rotated about the blade shaft 12.

  The entire casing of the blade shaft rotating means 15 is fixed to the side surface of the connecting duct 100A by welding or the like. Therefore, high airtightness can be maintained, and radioactive dust can be prevented from leaking from the gap between the casing of the blade shaft rotating means 15 and the connecting duct 100A.

  Further, the blade shaft rotating means 15 is provided with an angle display unit (not shown) so that it can be visually recognized from the outside. Thereby, the rotation angle of the blade shaft 12, that is, the rotation angle of the damper blade 11 can be confirmed from the outside.

  The handle 16 is a rod-shaped member, and one end is connected to one of the output shafts of the blade shaft rotating means 15. The handle 16 extends downward from the casing of the blade shaft rotating means 15 and is provided so as to penetrate the hole of the flange 10d. A substantially disc-shaped gripping portion 16a is provided at the end portion that penetrates the hole of the flange 10d. As a result, the operator can grip the gripping portion 16a and rotate the handle 16.

  Next, a method for installing the split damper 1 configured as described above will be described.

  (1) The flanges of the main duct 100 and the branch duct 102 and the flange 10 a are fixed, and the split damper 1 is attached to the branch portion of the main duct 100 and the branch duct 102. The split damper 1 is attached so that the blade shaft 12 is located on the main duct 100 side and the opening adjustment shaft 13 is located on the branch duct 102 side. At this time, the angle of the damper blade 11 has not been adjusted yet, and the damper blade 11 is held substantially horizontally by the holding force of the self-locking mechanism of the blade shaft rotating means 15.

  (2) The operator rotates the handle 16 so that the damper blade 11 has a desired angle while checking the angle display portion provided in the blade shaft rotating means 15. Thereby, the cross-section of the air path to the branch ducts 102a and 102b can be changed. The damper blade 11 is held at the position after rotation by the holding force of the self-locking mechanism of the blade shaft rotation means 15.

  (3) The handle 16 is fixed to the flange 10d. As a result, the damper blade 11 is fixed at a desired angle. As a method of fixing the handle 16 to the flange 10d, for example, a method of attaching a nut or the like to the flange 10d and fixing the nut and the handle 16 with a grub screw can be used.

  (4) The space between the blade shaft 12 protruding from the connecting duct 100A and the hole 10b is sealed with an elastic body such as rubber. Thereby, high airtightness can be ensured, and radioactive dust can be prevented from leaking outside through the gap between the blade shaft 12 and the hole 10b. Various known methods can be used as a method for sealing between the blade shaft 12 and the hole 10b.

  According to the present embodiment, by adjusting the damper blades to a desired angle, it is possible to change the air passage cross section to the branch ducts and adjust the air volume to each branch duct.

  Moreover, according to this Embodiment, since the damper blade | wing 11 is a both-end support, it can suppress the vibration of the damper blade | wing by an airflow.

  Moreover, according to this Embodiment, since there is no opening part, airtightness can be ensured and it can prevent that radioactive dust leaks outside.

  In this embodiment, in order to facilitate replacement of the split damper 1, the connecting duct 100A is connected to the main duct 100, and the damper blade 11, the blade shaft 12, and the opening adjustment shaft 13 are connected to the connecting duct 100A. The opening adjusting shaft guide 14 and the blade shaft rotating means 15 are provided, but the connecting duct 100A is not essential. The damper blade 11, the blade shaft 12, the opening adjustment shaft 13, the opening adjustment shaft guide 14, and the blade shaft rotating means 15 may be provided directly in the main duct 100.

  In the present embodiment, the two opening adjustment shafts 13 are provided coaxially, but need not be coaxial. A long hole 14a of the opening adjustment shaft guide 14 is formed according to the turning radius of the opening adjustment shaft 13 (distance between the blade shaft 12 and the opening adjustment shaft 13), and the opening adjustment shaft 13 is in the long hole 14a. Can be slid, the opening adjustment shaft 13 can be provided at an arbitrary position.

  In the present embodiment, since the opening adjustment shaft 13 slides in the long hole 14a, there is a gap of about 0.5 mm between the opening adjustment shaft 13 and the long hole 14a. Further, an elastic body such as rubber may be provided on the inside, and the opening adjustment shaft 13 may be provided in the long hole 14a via the elastic body. Accordingly, the opening adjustment shaft 13 can be slid within the long hole 14 a and the opening adjustment shaft 13 can be prevented from moving within the long hole 14. Therefore, vibration of the damper blade can be reliably suppressed.

  In the present embodiment, the holes 10b and the bearings 10c provided on both side surfaces of the connecting duct 100A extend the boundary surface between the branch duct 102a and the branch duct 102b when the split damper 1 is attached to the branch duct 10. Although it provided so that it might be located on a line, the position of the hole 10b and the bearing 10c is not limited to this. However, when the hole 10b and the shaft of the bearing 10c are located on the extended line of the boundary surface between the branch duct 102a and the branch duct 102b, the air volume from the main duct 100 to each branch duct should be adjusted more effectively. Can do.

  In this embodiment, holes 10b are provided on both side surfaces of the connecting duct 100A, and the blade shaft 12 protrudes from both side surfaces of the main duct 100. However, one blade shaft 12 is formed from the side surface of the main duct 100. It suffices if it projects, and the other blade axis does not have to project from the side surface of the main duct 100. In this case, the bearing 10c may be provided inside the main duct 100. In this case, there is a gap between the damper blade 11 and the main duct 100 corresponding to the bearing 10c, but there is no need to seal between the blade shaft 12 and the hole 10b with an elastic body such as rubber.

  In the present embodiment, the two blade shafts 12 are provided so that one end is fixed to the damper blade 11. However, one blade shaft may be fixed to the surface of the damper blade 11. Similarly, the opening adjustment shaft 13 may be fixed to the surface of the damper blade 11 with one opening adjustment shaft.

1: split damper, 10: casing, 11: damper blade, 12: blade shaft, 13: opening adjustment shaft, 14: opening adjustment shaft guide, 15: blade shaft rotating means, 16: handle, 100: main duct 102: Branch duct

Claims (7)

An air volume adjusting device provided on the main duct side of the connecting portion between the main duct and the branch duct,
Plate-like damper blades,
A rotation shaft provided at one end of both side surfaces of the damper blade and disposed through the main duct;
An opening adjustment shaft provided at the other end of each side surface of the damper blade;
A guide plate provided on the inner wall portion of the main duct having an arc-shaped long hole that is slid with the opening adjustment shaft fitted and slidable with a distance between the rotation shaft and the opening adjustment shaft as a radius When,
An air volume adjusting device characterized by comprising:   The air volume adjusting device according to claim 1, further comprising a rotating means connected to an end of the rotating shaft. The rotating means is
A rotation transmission means having two output shafts orthogonal to each other, wherein one of the two output shafts is connected to the rotation shaft;
A handle connected to the other one of the two output shafts, the handle extending downward from the rotation transmitting means;
The air volume adjusting device according to claim 2.   The air volume adjusting device according to any one of claims 1 to 3, further comprising fixing means for fixing the rotating shaft at a desired position. The air volume adjusting device has two guide plates,
The main duct has a substantially rectangular cross section,
The air volume adjusting device according to any one of claims 1 to 4, wherein the two guide plates are provided on both side surfaces of the main duct.   The air volume adjusting device according to claim 1, wherein a seal member is provided in the elongated hole, and the opening adjustment shaft is fitted into the elongated hole via the seal member.   The air volume adjusting device according to any one of claims 1 to 6, wherein the rotation shaft is disposed on an extension line of a boundary surface of the branch duct.

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