JP2018200159A - Flow control device - Google Patents

Abstract

The present invention provides a flow rate control device that can keep manufacturing costs low.
A duct 11 through which air from an upstream air conditioner 3 flows is provided. An orifice ring 21 (hollow structure plate) installed in the duct 11 is provided. A plate 22 that is formed in a plate shape overlapping the hollow portion 24 of the orifice ring 21 and operates in a state parallel to the orifice ring 21 is provided. An actuator 23 (drive unit) that operates the plate 22 is provided.
[Selection] Figure 1

Description

  The present invention relates to a flow rate control device that controls the flow rate of a gas.

  Conventionally, as a flow control device for controlling the flow rate of gas, there is one called a venturi valve. This venturi valve has good responsiveness and low noise even when a large flow rate of gas flows. For this reason, this type of venturi valve is provided in a local exhaust duct of a fume hood as described in Patent Document 1, or air supply, general exhaust, or local exhaust is performed in a manufacturing facility, laboratory, hospital, or the like. Often provided in the duct.

  A general venturi valve includes a venturi that forms an air passage and a cone that has the center of the venturi as an axis. The upstream half of the cone is formed in a hemispherical shape, and the downstream half is formed similar to the peripheral wall of the venturi. The cone is supported by the shaft and reciprocates to increase or decrease the flow rate.

JP2015-52414A

  Venturi valves have excellent characteristics and responsiveness, but the outer shape of the venturi and cone is streamlined, so it takes a long time to design and manufacture, resulting in high manufacturing costs. .

  The present invention has been made to solve such a problem, and makes it possible to keep the manufacturing cost low.

  In order to achieve this object, a flow control device according to the present invention includes a duct through which air from an upstream air conditioner flows, a hollow structure plate installed in the duct, and a plate shape that overlaps a hollow portion of the plate. And a plate that operates in a state parallel to the plate, and a drive unit that operates the plate.

  In the flow control device according to the present invention, the drive unit may be constituted by a direct acting linear actuator.

In the flow rate control device according to the present invention, the hollow portion of the plate has a circular opening shape,
The plate may be formed in a disc shape.

  In the flow control device according to the present invention, one end of the duct may be connected to a chamber.

  In the flow rate control device according to the present invention, the plate is disposed downstream of the plate in the direction in which the gas flows, and the drive unit is supported by the fixed wall portion and the gas flows in the direction from the plate. It may be arranged on the downstream side.

  In the flow rate control apparatus according to the present invention, the flow rate decreases when the plate is operated by the drive unit and approaches the plate, and the flow rate increases when the plate is separated from the plate. In this flow control device, the hollow portion of the plate substantially constitutes the venturi portion of the venturi valve, and the plate substantially constitutes the cone of the venturi valve.

The plate and the plate can each be formed of a plate material.
Therefore, according to the present invention, it is possible to provide a flow rate control device that can keep the manufacturing cost low.

It is a perspective view which shows the room side edge part of the air conditioning system using the flow control apparatus which concerns on this invention. FIG. 1 shows a duct and a part of a pipe of a flow control device in a state where the pipe is broken. It is sectional drawing of the blower outlet VAV. It is sectional drawing of a flow control apparatus. FIG. 3 shows a state in which the plate is positioned in the middle. It is sectional drawing of a flow control apparatus. FIG. 4 shows a state in which the plate is positioned fully open. It is sectional drawing which looked at the flow control device from the upstream side. The broken position in FIG. 5 is indicated by the line VV in FIG. It is sectional drawing which shows typically the direction through which the air which passed the butterfly valve in intermediate opening flows. It is sectional drawing which shows typically the direction through which the air which passed the butterfly valve of a full open state flows. It is sectional drawing which shows other embodiment of a flow control apparatus. It is sectional drawing which shows other embodiment of a flow control apparatus. It is sectional drawing which shows other embodiment of a flow control apparatus.

(First embodiment)
Hereinafter, an embodiment of a flow control device (VAV: Variable Air Volume) according to the present invention will be described in detail with reference to FIGS. In this embodiment, an example in which the present invention is applied to a flow rate control device for an outlet VAV will be described.

  The air outlet VAV1 is for air conditioning the room 2 connected to the lower part in FIG. The air outlet VAV1 has an upstream duct 4 to which conditioned air is sent from the upstream air conditioner 3, and a chamber 6 connected to a downstream end of the upstream duct 4 via a flow rate control device (hereinafter simply referred to as VAV) 5 described later. Etc.

The upstream duct 4 according to this embodiment is installed horizontally on the ceiling 7 as shown in FIG.
The chamber 6 is formed in a box shape. The downstream end of the VAV 5 is connected to one side of the chamber 6. A duct member 8 is connected to the lower end of the chamber 6. The duct member 8 is attached to the ceiling wall 9.

  An air outlet 10 for supplying conditioned air (hereinafter simply referred to as air) to the indoor space S is provided at a lower end portion of the duct member 8 and serving as a ceiling portion of the indoor space S. Air flows into the chamber 6 from the upstream duct 4 through the inside of the VAV 5, flows downward in the duct member 8, and is supplied into the room 2 from the outlet 10. Hereinafter, the downstream side in the direction in which air flows is simply referred to as “downstream side”, and the upstream side in the direction in which air flows is simply referred to as “upstream side”.

  As shown in FIGS. 1 and 2, the VAV 5 includes a cylindrical duct 11 having the same diameter as that of the upstream duct 4 and a plurality of parts described later housed in the duct 11. The duct 11 is attached to the upstream duct 4 and the chamber 6, respectively. The duct 11 is located on the same axis as the cylindrical upstream duct 4.

  The plurality of parts accommodated in the duct 11 are an orifice ring 21 located in the upstream portion of the duct 11, a disk-like plate 22 located on the downstream side, and an actuator 23 located on the further downstream side. is there. In this embodiment, the orifice ring 21 corresponds to a “hollow structure plate” in the present invention. The actuator 23 corresponds to the “driving unit” in the present invention.

The orifice ring 21 is formed in an annular plate shape and is fixed to the inner periphery of the duct 11 without a gap.
The plate 22 is formed in a disk shape and is supported by the actuator 23.

  By providing the disk-shaped plate 22 in the duct 11 as described above, the plate 22 is concentric with the orifice ring 21 when viewed from the direction of air flow, as shown in FIG. The outer diameter D of the plate 22 according to this embodiment is slightly smaller than the inner diameter of the orifice ring 21. More specifically, the plate 22 according to this embodiment is sized so that it can be inserted into the hollow portion 24 of the orifice ring 21, and the clearance between the plate 22 and the orifice ring 21 is as small as possible. Is formed. The outer diameter D of the plate 22 may be larger than the inner diameter of the orifice ring 21.

  The actuator 23 is supported by the orifice ring 21 via a support bracket 25. The support bracket 25 is fixed to the orifice ring 21 above and below the plate 22. The actuator 23 is fixed to the end of the support bracket 25.

  The actuator 23 according to this embodiment is constituted by a linear motion linear actuator, and includes a main body 23a and a shaft 23b penetrating the main body 23a. The plate 22 described above is fixed to the end of the shaft 23b.

  The actuator 23 positions the plate 22 at the target position. When the actuator 23 is operated, the plate 22 is positioned between a fully closed position close to the orifice ring 21 and a fully open position spaced downstream from the orifice ring 21. As a result, the corresponding flow rate can be controlled between the fully closed position and the fully open position.

The flow rate of air passing through the orifice ring 21 is changed by changing the distance between the orifice ring 21 and the plate 22. That is, when the plate 22 moves from the closed position to the downstream side, the air flow rate through the orifice ring 21 gradually increases, and when the plate 22 moves toward the closed position, the air flow rate through the orifice ring 21. Gradually decreases.
In the state where the plate 22 is located at an intermediate position between the fully closed position and the fully open position as shown in FIG. 3, the air generally flows as indicated by the two-dot chain line arrow. That is, the air is throttled in the hollow portion 24 of the orifice ring 21 and flows downstream through the opening between the orifice ring 21 and the plate 22.

On the other hand, in the state where the plate 22 is located at the fully open position as shown in FIG. 4, the air generally flows as indicated by the dashed arrows. That is, air is throttled in the hollow portion 24 of the orifice ring 21 and flows downstream between the orifice ring 21 and the plate 22 through an opening wider than the state shown in FIG.
The streamline of the air flowing into the chamber 6 from the VAV 5 does not vary greatly regardless of the position of the plate 22. When a butterfly valve is used instead of the VAV 5, the streamlines of the air flowing into the chamber 6 are greatly different depending on the opening as shown in FIGS.

  6 shows a state where the angle of the butterfly valve 31 is 60 °, and FIG. 7 shows a state where the butterfly valve 31 is fully opened. When the butterfly valve 31 is used, the air is biased to one side as much as the butterfly valve 31 is inclined. Therefore, the state of the air flow on the downstream side is greatly different between the intermediate opening degree and the fully opened state. On the other hand, by using the VAV 5 according to this embodiment, even if the air flow rate changes, the streamlines in the chamber 6 are less likely to be disturbed. It becomes possible to change the flow rate.

The orifice ring 21 and the plate 22 can each be formed of a plate material. For this reason, the VAV 5 can be easily manufactured as compared with a venturi valve in which parts such as a venturi part and a cone are streamlined.
Therefore, according to this embodiment, it is possible to provide a flow rate control device capable of keeping the manufacturing cost low.

The actuator 23 according to this embodiment is constituted by a linear motion type linear actuator.
For this reason, since the actuator 23 can be accommodated in the duct 11, a flow rate control device having a compact outer shape can be provided.

The orifice ring 21 according to this embodiment is formed to have a circular opening. The plate 22 is formed in a disk shape.
For this reason, the air in the duct 11 is substantially uniformly throttled in the circumferential direction by the hollow portion 24 of the orifice ring 21, and is expanded substantially equally in the circumferential direction through the annular space between the orifice ring 21 and the plate 22. The The air condition when the air is throttled and expanded does not change greatly even if the position of the plate 22 changes.

  One end of the duct 11 according to this embodiment is connected to the chamber 6. For this reason, VAV5 by this embodiment can be easily assembled | attached to the blower outlet VAV1 of an air conditioning system.

The plate 22 according to this embodiment is disposed downstream of the orifice ring 21. The actuator 23 is supported by the orifice ring 21 and is disposed downstream of the plate 22.
In this embodiment, the plate 22 acts as a partition for the air flowing through the fluid passage 15, and the actuator 23 is disposed on the back side of the partition. For this reason, the direction in which air directly hits the actuator 23 and flows is rarely changed. As a result, the flow direction of air does not change significantly on the downstream side of the VAV 5 and the flow rate of air can be changed.

(Other embodiments)
As shown in FIGS. 8 to 10, the positions of the actuator and the plate can be appropriately changed according to the size of the space required on the downstream side of the flow rate control unit.
The actuator 23 shown in FIG. 8 is disposed upstream of the orifice ring 21. The plate 22 is disposed downstream of the orifice ring 21. By adopting this configuration, the distance between the orifice ring 21 and the chamber 6 is shortened by the installation space of the actuator 23 as compared with the case where the embodiment shown in FIGS.

  The actuator 23 shown in FIG. 9 is arranged on the downstream side of the orifice ring 21. The plate 22 is disposed upstream of the orifice ring 21. By adopting this configuration, the distance between the orifice plate 21 and the chamber is shortened by the installation space of the plate 22 as compared with the case where the embodiment shown in FIGS.

  The actuator 23 and the plate 22 shown in FIG. 10 are both arranged upstream of the orifice ring 21. The actuator 23 is located on the upstream side of the plate 22. By adopting this configuration, the distance between the orifice ring 21 and the chamber 6 is shortened by the installation space of the plate 22 and the actuator 23 as compared to the case where the above-described embodiments are employed.

  In embodiment mentioned above, the example which applies this invention to the flow control apparatus integrated in an air conditioning system was shown. However, the flow control device according to the present invention is not limited to such a limitation, and can be provided in a fluid passage that performs supply, exhaust, ventilation, and the like in a manufacturing facility, a laboratory, a hospital, and the like.

  Further, the upstream duct 4 and the duct 11, the orifice ring 21 and the plate 22 shown in the above-described embodiment are each formed in a circular shape when viewed from the air flow direction. However, the present invention is not limited to such a limitation. The upstream duct 4 and the duct 11 can be formed in a polygon or an ellipse. Further, the shape of the hollow portion 24 and the plate 22 of the orifice ring 21 may be, for example, a polygon or an ellipse when viewed from the air flow direction.

  DESCRIPTION OF SYMBOLS 1 ... Air outlet VAV, 7 ... VAV, 8 ... Chamber, 14 ... Duct, 21 ... Orifice ring (plate of hollow structure), 22 ... Plate, 23 ... Actuator (drive part).

Claims (5)

A duct through which air from the upstream air conditioner flows;
A hollow plate installed in the duct;
A plate that is formed in a plate shape that overlaps the hollow portion of the plate and operates in a state parallel to the plate;
A driving unit for operating the plate;
A flow control device comprising: The flow control device according to claim 1,
The flow rate control device according to claim 1, wherein the drive unit is constituted by a linear motion type linear actuator. In the flow control device according to claim 1 or 2,
The hollow portion of the plate has a circular opening shape,
The said flow rate control apparatus characterized by the said plate being formed in disk shape. In the flow control device according to claim 3,
One end of the duct is connected to a chamber. In the flow control device according to any one of claims 1 to 4,
The plate is disposed downstream of the plate in the direction in which the gas flows,
The flow rate control device according to claim 1, wherein the drive unit is supported by the fixed wall portion and disposed downstream of the plate in a direction in which the gas flows.

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