JP2011052931A - Variable air volume unit - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a variable air volume unit taking out a component to outside for maintenance and inspection even when no spatial allowance is provided around a duct. <P>SOLUTION: A casing 51 includes: an opening 514 for damper maintenance arranged on at least one side wall; and an opening lid body 516 for damper maintenance covering the opening 514 for damper maintenance and detachably attached to the casing 51. A damper 54 is arranged so that one end side of a rotating shaft 541 is journaled to an other side wall of the casing 51 and the other end side of the rotating shaft 541 is journaled to the opening lid body 516 for damper maintenance. The damper 54 can be taken in to/out of the casing 51 via the opening 514 for damper maintenance from which the opening lid body 516 for damper maintenance is detached. <P>COPYRIGHT: (C)2011,JPO&INPIT

Description

  The present invention relates to a variable air volume unit that controls an air volume in an air conditioner or the like, and relates to a structure for performing maintenance and inspection such as cleaning of the inside of the unit and replacement of consumable parts.

  Conventionally, there are devices of this type as shown in FIGS. 18 and 19, for example. This apparatus has a structure in which the casing 1 is interposed in the middle of a duct (not shown), and the wind speed sensor 2, the perforated plate 3, and the damper are sequentially formed in the casing 1 from the upstream opening to the downstream opening. 4 is arranged. The wind speed sensor 2 is provided at a position substantially corresponding to the center of the upstream opening of the casing 1, and the perforated plate 3 disposed on the downstream side of the wind speed sensor 2 is located between the upper surface and the lower surface at an intermediate position in the height direction of the casing 1. It is bent in two to form a V-shaped cross section, and the shape between the upper surface and the lower surface widens toward the downstream side.

  A control box 5 is mounted on the side of the casing 1, and a control board 6 and a control motor 7 are provided inside the control box 5. The damper 4 disposed on the downstream side of the perforated plate 3 has a rotating shaft connected to the control motor 7, and the control circuit of the control board 6 operates the control motor 7 based on the detection value of the wind speed sensor 2, so that the damper 4 The air volume is controlled by adjusting the rotation angle.

  The variable air volume unit described in Patent Document 1 connects a duct flow path for air conditioning or air supply / ventilation equipment to the upstream side of a housing, and includes a wind speed sensor and a damper mechanism inside the housing. The wind speed sensor detects the wind speed of the internal flow air, and the damper mechanism adjusts the air volume to the downstream supply destination based on the detection signal from the wind speed sensor.

  Moreover, the variable air volume damper device described in Patent Document 2 is attached to the air outlet of the air conditioning pipe duct, and has a side mounting hole on a side surface of the guide case, and an open / close damper body and a control circuit inside the guide case. The part is arranged. The open / close damper body has a convex appearance, can be attached to the side mounting hole from the inside of the guide case, and the convex shape portion is accommodated in the air conditioning pipe duct through the side mounting hole in the mounting state, The amount of blown air changes by adjusting the degree of opening and closing of the damper. The control circuit unit is separated from the open / close damper main body and disposed outside the open / close damper main body, and controls a drive motor that opens and closes the damper of the open / close damper main body.

JP-A-11-190553 Japanese Patent No. 2626362

  In the configuration described above, the casing 1 is not provided with an opening having a large area other than the upstream opening and the downstream opening, and components such as the damper 4 are taken in and out of the upstream opening or the downstream during assembly. It goes through the side opening.

  That is, at the time of assembly, the damper 4 is carried into the casing 1 from the upstream opening or the downstream opening, and both ends of the rotating shaft of the damper 4 are made the wall surface of the casing 1 by elastic deformation operation or the like that bends the wall surface of the casing 1. The damper 4 is attached to the casing 1 by forcibly inserting into the provided hole. For this reason, in order to take out the damper 4 from the casing 1 at the time of maintenance inspection, it is necessary to remove the casing 1 from the duct.

  Further, since the member such as the perforated plate 2 is fixed to the casing 1 by rivets or welding after the damper 4 is incorporated, it is very difficult to remove the damper 4 from the casing 1.

  In Patent Document 1, the position of the wind speed sensor arranged inside the housing is adjusted by inserting a hand into the housing through an inspection port provided in the housing and adjusting the position of the hanger or bracket that supports the wind speed sensor. Do. However, since the damper mechanism or the like is not structured to be taken out of the housing, it is necessary to remove the entire variable air volume unit from the duct and disassemble and maintain the variable air volume unit when performing maintenance and inspection of the damper mechanism and the like.

  In Patent Document 2, the guide case can be attached to the duct. However, since the open / close damper body is attached to the side mounting hole from the inside of the guide case, the open / close damper body is attached to the duct with the guide case attached to the duct. The guide case must be removed from the duct for maintenance inspection of the open / close damper body. However, it is impossible to dispose the guide case in the middle part of the duct or the like in a space where there is no room, such as the back of the ceiling, because of the difficulty in mounting the guide case due to spatial reasons.

  The present invention solves the above-described problems, and an object of the present invention is to provide a variable airflow unit that can take out components for maintenance and inspect even if there is no space around the duct. .

  In order to solve the above problems, the variable air volume unit of the present invention is mounted on a casing that forms a ventilation path between an upstream opening and a downstream opening, a damper disposed in the casing, and a rotating shaft of the damper. The variable air volume unit is provided with damper driving means for rotationally driving the damper, and the casing has a maintenance opening on at least one side wall and covers the maintenance opening so as to be detachable from the casing. And the damper is disposed with the one end side of the rotating shaft pivoted to the other side wall portion of the casing and the other end side of the rotating shaft pivoted to the lid body. It is characterized in that it can be taken in and out of the casing through the maintenance opening from which is removed.

  The variable air volume unit of the present invention further includes damper positioning means for maintaining the relative position of the damper and the lid in the axial direction of the rotation shaft of the damper, and when the lid is arranged to cover the maintenance opening, The damper is positioned with respect to the lid by positioning means.

  Further, in the variable airflow unit of the present invention, the casing has a maintenance opening on each of both side wall portions, and has a lid body that covers each maintenance opening and is detachably attached to the casing. The damper is characterized in that one end side or the other end side of the rotating shaft is pivotally attached to each lid body.

The variable air volume unit of the present invention is characterized in that a rectifying member is provided upstream of the damper in the casing, and the maintenance opening faces at least a part of the rectifying member.
Further, the variable air volume unit of the present invention is characterized by comprising a control box for accommodating the damper driving means, the control box is disposed so as to cover the lid, and a heat insulating material is interposed between the lid and the control box. To do.

  As described above, according to the present invention, the rotary shaft of the damper is pivotally attached to the lid that covers and installs the maintenance opening, so that the damper can be removed from the inside and outside of the casing through the maintenance opening by removing the lid. It can be put in and out. Therefore, only the damper can be taken out from the casing for maintenance and inspection without removing the casing from the duct.

  Since the damper positioning means for maintaining the relative position of the damper and the lid is provided, it is not necessary to adjust the positioning of the damper when assembling the damper part during manufacturing or maintenance inspection, and the working efficiency can be improved. In addition, when the damper is assembled, it is possible to prevent the damper valve body from being fitted in the maintenance opening, thereby preventing the damper from being damaged or the motor being burned.

  If both wall surfaces of the casing are provided with maintenance openings and lids, and the rotation shaft of the damper is pivotally attached to both lids, the damper is removed from the casing by removing one of the casing lids. The maintenance inspection work can be performed according to the installation status of the variable airflow unit.

When the maintenance opening faces at least a part of the rectifying member, dust and dirt caught on the rectifying member can be removed from the maintenance opening.
Since a heat insulating material is provided between the control box that houses the damper driving means and the casing, the noise between the maintenance opening and the lid, and the noise of air leakage from the shaft penetration of the damper shaft provided in the lid Can be reduced.

The top view which shows the variable air volume unit in embodiment of this invention Side view showing variable air volume unit in the same embodiment A longitudinal sectional view showing a variable air volume unit in the same embodiment The front view which shows the variable air volume unit in the same embodiment Sectional drawing of the principal part of the variable air volume unit in the same embodiment The perspective view which shows the bearing of the variable air volume unit in the embodiment The perspective view which shows the spacer of the variable air volume unit in the same embodiment The perspective view which shows the mounting state of the spacer of the variable air volume unit in the same embodiment The exploded perspective view which shows the variable air volume unit in the same embodiment The perspective view which shows the control motor of the variable air volume unit in the embodiment The top view which shows the variable air volume unit in other embodiment of this invention. Side view showing variable air volume unit in the same embodiment A longitudinal sectional view showing a variable air volume unit in the same embodiment Sectional drawing of the principal part which shows the variable air volume unit in the same embodiment The front view which shows the variable air volume unit in the same embodiment Sectional drawing of the principal part of the variable air volume unit in other embodiment of this invention Sectional drawing of the principal part of the variable air volume unit in other embodiment of this invention The perspective view which transparently shows the principal part of the conventional variable air volume unit The perspective view which shows the air volume sensor of the variable air volume unit

  Hereinafter, embodiments of the present invention will be described with reference to the drawings. 1 to 10, the variable airflow unit has a structure in which a casing 51 is interposed in the middle of a duct (not shown), and the downstream opening from the upstream opening 511 that forms a duct connection port in the casing 51. A wind speed sensor 52, a perforated plate 53, and a damper 54 are sequentially arranged toward 512. The upstream opening 511 has a flow passage cross-sectional area that is narrower than the main body flow passage cross-sectional area of the casing 51 and the flow passage cross-sectional area of the downstream opening 512 in order to increase the sensor sensitivity of the wind speed sensor 52. ing.

  The wind speed sensor 52 is provided at a position substantially corresponding to the center of the upstream opening 511 of the casing 51, and the perforated plate 53 disposed on the downstream side of the wind speed sensor 52 forms a rectifying member, and is intermediate in the height direction of the casing 51. The upper surface 531 and the lower surface 532 are bent at two positions to form a V-shaped cross section, and the space between the upper surface 531 and the lower surface 532 widens toward the downstream side.

  A control box 55 is attached to the side of the casing 51, and a control board 56 and a control motor 57 are provided inside the control box 55 covered with a cover 551. The control motor 57 is damper driving means for rotationally driving the damper 54. The drive shaft 571 has a sleeve shape, and the damper 54 disposed on the downstream side of the perforated plate 53 is provided with a valve plate 542 on the rotational shaft 541. The damper 54 inserts the rotating shaft 541 into the drive shaft 571 of the control motor 57 and connects and fixes the rotating shaft 541 and the drive shaft 571 by connecting bolts 572 provided on the drive shaft 571.

  The casing 51 has two openings on the side wall surface, and one opening is a sensor maintenance opening 513 for maintenance and inspection of the wind speed sensor 52, and the other opening is for maintenance and inspection of the damper 54. This is a damper maintenance opening 514. A sensor maintenance opening cover 515 and a damper maintenance opening cover 516 that cover the sensor maintenance opening 513 and the damper maintenance opening 514 are detachably attached to the casing 51 with screws or the like.

  A damper stopper 60 is provided inside the casing 51, and the damper stopper 60 abuts against the side edge of the valve plate 542 when the damper 54 is fully closed to seal the periphery of the valve plate 542. The damper stopper side 601 provided on the side wall portion has an L-shaped damper stopper side 601, and the damper stopper upper side 602 and the damper stopper lower side 603 provided on the ceiling part and bottom surface part of the casing 51, and the damper stopper side 601 faces the valve plate 542 A sponge material 604 is attached to the surface. The damper stopper lateral 601 needs to be arranged as close as possible to the rotating shaft 541 in order to reduce air leakage.

  The damper 54 is pivotally attached at one end of the rotating shaft 541 to a hole 517 provided on one side wall surface of the casing 51 via a bearing sleeve 543, and the other end of the rotating shaft 541 is attached to a damper maintenance opening lid 516. It is pivotally attached to the provided hole 518 via a bearing sleeve 543.

  A spacer 61 is provided as a damper positioning means between the damper maintenance opening lid 516 and the valve plate 542 of the damper 54. The spacer 61 of the damper positioning means has a through hole 611 through which the rotary shaft 541 is inserted, and has a notch 612 that engages with the damper stopper lateral 601 at the side edge to prevent the spacer 61 from rotating. It is not always necessary to prevent the spacer 61 from rotating, and the spacer 61 has an appropriate size in the positional relationship with the damper stopper side 601.

  One side of the spacer 61 abuts on a bearing sleeve 543 mounted in the hole 518 of the damper maintenance opening lid 516 and the other side abuts on the valve plate 542 of the damper 54, so that the rotating shaft 541 of the damper 54 is assembled. The relative position of the damper 54 and the damper maintenance opening cover 516 is maintained in the axial direction, and the bearing sleeve 543 mounted in the hole 517 of the casing 51 is sufficiently maintained to hold the rotating shaft 541, and the control motor 57 ensures that the drive shaft 571 sufficiently holds the rotation shaft 541.

  The control box 55 is disposed so as to cover the damper maintenance opening lid 516, and a heat insulating material 552 is interposed between the control box 55 and the casing 51. Installation of the heat insulating material 552 is optional and is arranged according to the surrounding environmental conditions. A viewing window 553 is provided in the cover 551 of the control box 55.

  Hereinafter, the operation of the above-described configuration will be described. The variable air volume unit measures the wind speed of the airflow flowing from the upstream duct through the upstream opening 511 by the wind speed sensor 52, and the control circuit of the control board 56 operates the control motor 57 based on the detection value of the wind speed sensor 52. Then, the air volume is controlled by adjusting the rotation angle of the damper 54. The perforated plate 53 rectifies the passing airflow.

  During maintenance and inspection of the wind speed sensor 52, the sensor maintenance opening cover 515 is removed, and maintenance and inspection such as position adjustment and cleaning of the wind speed sensor 52 are performed through the sensor maintenance opening 513. The position of the wind speed sensor 52 can be individually adjusted for each variable air volume unit according to the wind speed deflection caused by the bending of the upstream duct.

  During maintenance and inspection of the damper 54, the cover 551 of the control box 55 is removed, the connection bolt 572 of the drive shaft 571 of the control motor 57 is loosened, the connection between the drive shaft 571 and the rotary shaft 541 is released, and the control box 55 is insulated from the heat insulating material 552. At the same time, it is removed from the casing 51.

  Next, the damper maintenance opening lid 516 is removed from the casing 51 and the damper maintenance opening lid 516 is removed from the rotating shaft 541 of the damper 54. Then, the rotating shaft 541 of the damper 54 is pulled out from the side wall surface of the casing 51, and the damper 54 and the bearing sleeve 543 are taken out of the casing 51 through the damper maintenance opening 514.

  In this way, the other end side of the rotary shaft 541 of the damper 54 is pivotally attached to the damper maintenance opening lid 516 that covers and is mounted on the damper maintenance opening 514, so that the damper maintenance opening lid 516 is attached. The damper 54 and the bearing sleeve 543 can be taken in and out of the casing 51 through the damper maintenance opening 514. Therefore, maintenance and inspection can be performed by removing the damper 54 and the bearing sleeve 543 from the casing 51 without removing the casing 51 from the duct.

  Further, since the spacer 61 as the damper positioning means is provided, at the time of assembly, one end side of the rotating shaft 541 of the damper 54 is inserted into a hole 517 provided on one side wall surface of the casing 51 via the bearing sleeve 543, and the rotating shaft By inserting the spacer 61, the bearing sleeve 543, and the damper maintenance opening lid 516 into the other end side of the 541 and attaching the damper maintenance opening lid 516 to the casing 51, the damper maintenance opening lid 516 is attached to the damper maintenance opening lid 516. The damper 54 can be positioned with respect to the control motor 57 in the control box 55 to be attached later, and the rotation shaft 541 of the damper 54 can be disposed at an appropriate position.

  Further, the damper maintenance opening 514 has such a size that it can be inserted / removed in a state in which the valve body 542 of the damper 54 is inclined depending on the positional relationship with the sensor maintenance opening, the mounting relationship of the control box, and the like. There are many things. However, by setting the thickness of the spacer 61 so that the spacer 61 forms a gap larger than the plate thickness of the casing 51 between the valve body 542 and the damper maintenance opening lid 516, the damper 54 can be A work mistake of fixing the damper 54 to the control motor 57 in a state where the valve body 542 is fitted in the damper maintenance opening 514 can be avoided. Therefore, the damper 54 operates in a state in which the valve body 542 is fitted in the damper maintenance opening 514, the movement of the valve body 542 is restricted by the peripheral edge of the damper maintenance opening 514, and the damper 54 is damaged. It is possible to prevent the control motor 57 from burning.

  Further, since the damper maintenance opening 514 opens at least part of the perforated plate 53 forming the flow straightening member, here facing part of the downstream side at the end portions of the upper surface 531 and the lower surface 532, the damper 54 is removed after the damper 54 is removed. Can check the position of dust and dirt adhering to the perforated plate 53 through the damper maintenance opening 514, and remove the dust and dirt by inserting a cleaning tool into the upstream area of the perforation plate 53 from the damper maintenance opening 514. Therefore, the cleaning work can be performed reliably.

  Further, when the heat insulating material 552 is attached, it is caused by a gap between the damper maintenance opening 514 and the damper maintenance opening lid 516 or air leakage from the hole 518 provided in the damper maintenance opening lid 516. Noise can be reduced.

  As another embodiment, as shown in FIG. 11 to FIG. 15, the variable airflow unit may use a casing 71 having the same flow path cross-sectional area from the upstream opening 511 to the downstream opening 512. Is possible. The effect is the same as that of the previous embodiment.

  In the embodiment described above, the spacer 61 is used as the damper positioning means. However, when the flange portion of the bearing sleeve 543 has a thickness corresponding to the spacer 61, the spacer 61 can be eliminated. Alternatively, as shown in FIG. 16, a step 62 that protrudes toward the inner surface side of the casing 51 may be provided around the hole 518 of the damper maintenance opening cover 516. As shown in FIG. A protruding portion 63 may be provided around the shaft portion.

  In the above-described embodiment, the damper maintenance opening 514 is provided at one place on the side wall of the casing 51. However, as shown in FIG. 17, damper maintenance openings 514 are provided on both side walls of the casing 51, and damper maintenance opening lids 516 are attached to the respective damper maintenance openings 514. A structure in which one end side and the other end side of the rotating shaft 541 of the damper 54 are pivotally attached to the maintenance opening 514 may be employed. Thereby, it becomes possible to correspond to the case where the control box 55 is arranged on the right side of the casing 51 and the case where it is arranged on the left side depending on the situation of the inspection space of the installation place. In this case, it is desirable that the protrusions 63 serving as damper positioning means are provided on both sides of the damper 54.

51, 71 Casing 52 Air velocity sensor 53 Perforated plate 54 Damper 55 Control box 56 Control board 57 Control motor 60 Damper stopper 61 Spacer 62 Step 63 Projection 511 Upstream opening 512 Downstream opening 513 Sensor maintenance opening 514 Damper maintenance Opening 515 Sensor maintenance opening lid 516 Damper maintenance opening lid 517 518 Hole 531 Upper surface 532 Lower surface 541 Rotating shaft 542 Valve plate 543 Bearing sleeve 551 Cover 552 Thermal insulation 553 Viewing window 571 Drive shaft 572 Connecting bolt 601 Damper stopper side 602 Damper stopper top 603 Damper stopper bottom 604 Sponge material 611 Through hole 612 Notch

Claims (5)

  A casing provided with a ventilation path between the upstream opening and the downstream opening, a damper disposed in the casing, and a damper driving means that is mounted on the rotation shaft of the damper and rotationally drives the damper. The airflow unit has a maintenance opening on at least one side wall, a cover that covers the maintenance opening and is detachably attached to the casing, and the damper has one end of the rotating shaft. The side of the rotating shaft is pivotally attached to the other side wall of the casing, and the other end of the rotary shaft is pivotally attached to the lid, and can be taken in and out of the casing through the maintenance opening from which the lid is removed. Variable air volume unit characterized by.   Damper positioning means for maintaining the relative position of the damper and the lid in the axial direction of the rotation axis of the damper is provided, and when the lid is placed so as to cover the maintenance opening, the damper positioning means causes the damper to be placed on the lid. The variable air volume unit according to claim 1, wherein the air volume unit is positioned.   The casing has a maintenance opening on each of both side wall portions, and has a lid body that covers each maintenance opening portion and is detachably attached to the casing. The damper is attached to each lid body at one end of the rotating shaft. The variable air volume unit according to claim 1 or 2, wherein the side or the other end side is pivotally attached.   The variable air volume unit according to any one of claims 1 to 3, wherein a rectifying member is provided on the upstream side of the damper in the casing, and the opening for maintenance faces at least a part of the rectifying member.   5. A control box for accommodating a damper driving means, the control box is disposed so as to cover the lid, and a heat insulating material is interposed between the lid and the control box. Variable air volume unit as described in the item.

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