JPH0236997Y2 - - Google Patents

Description

[Detailed explanation of the invention] Purpose of the invention (1) Industrial application field The present invention is a damper used for air conditioning, etc., and in particular, the damper blade opening and air flow rate change in a linear proportional relationship. Regarding a linear damper with improved linear characteristics.

(2) Conventional technology In order to maintain constant temperature and humidity conditions in the sky and maintain a comfortable space, a damper is placed along the duct route and the opening of the damper blades is adjusted to change the amount of air ventilation. The method is widely used. In modern large-scale buildings, central heating and cooling systems are used to control the air conditioning in each compartmentalized room, and dampers perform the central function of direct control within this entire system. It is becoming.

In other words, for example, if 100% of the air is supplied and exhausted in order to maintain constant indoor static pressure, 70% of the exhaust air will be exhausted outside, and the remaining 30% will be exhausted.
The control method is to send 100% of the air to the air conditioner, take in 70% of the fresh air from the outside, and mix these to supply 100% of the air indoors.
Therefore, by changing the opening degree of the damper blade of the damper that directly controls the air flow rate and the air flow rate in a proportional relationship, the air flow rate control can be performed accurately, reliably and easily, and it is possible to It is possible to achieve an effective air conditioning control system with a simple configuration without requiring a flow rate measuring device or the like. Conventionally, as such a mixing damper, a so-called butterfly damper is constructed with multiple blades as shown in Fig. 5 A and B, and used as parallel blades or opposed blades, or as described in Japanese Patent Publication No. 14305/1983. A configuration has been proposed in which the other ends of two damper blades pivoted on a common shaft in a cylindrical part are bent inward to form a valve body with a fan-shaped cross section, and the central angle of both damper blades is adjusted. .

(3) Problems to be solved by the invention In the former configuration, the blade opens and closes while rotating in a complete circumference inside the ventilation hole around the rotation axis. Therefore, the relationship between the rotation angle (opening degree) of the blades and the air flow rate is curve a in Figure 2 when the blades rotate in parallel, and curve b in Figure 2 when the blades are opposed.
All of them show remarkable curvilinear displacement characteristics, and the proportional relationship between the blade opening and the flow rate cannot be maintained, and even a slight change in the opening causes a sudden change in air volume. The above static pressure is applied, making it difficult to perform accurate and reliable air conditioning control.

In addition, in the latter configuration, since the fan-shaped cross section is formed in a direction approximately perpendicular to the flow path, even if the center angle of both damper blades is set to the minimum, the fan-shaped portion blocks the flow path, resulting in a large pressure loss, and in practice The control range of the air flow rate is extremely limited, and since the center angle is pivoted on a common axis, the setting operation is extremely complicated and complicated, so it is not practical. It was not offered to the public.

The present invention was made to eliminate the above-mentioned drawbacks, and its purpose is to maintain a simple structure, keep costs low, and maintain a linear relationship between the opening degree of the arc plate (blade) and the air flow rate. To provide a linear damper that can maintain a proportional relationship and accurately and reliably control an air conditioning system directly with the damper device itself without requiring an air flow rate measuring device or the like other than the damper.

Structure of the invention (1) Means for solving the problem In order to achieve the above purpose, the present invention communicates the space to be air-conditioned with an air conditioner, and exhausts a predetermined amount of air from the space to be air-conditioned. A damper installed in an air conditioning duct in order to supply a predetermined amount of fresh outside air to a space to be air-conditioned and to maintain constant static pressure in this space, the duct flow path having a rectangular cross section. a rotating shaft 3 provided substantially perpendicular to the air ventilation direction in the rotating shaft 1; a circular arc section along a circular arc on a circle centered on the rotating shaft;
an arcuate plate 2 which is arcuate in shape and is fixed to the rotation shaft 3 at the center of curvature of the arcuate portion, and which rotates within the flow path 1 while forming a rectangular projected shape in the ventilation direction; Formed on one wall side of road 1,
an accommodation space 4 for storing the arcuate plate 2; the arcuate plate 2 moves in and out of the accommodation space 4 into and out of the flow path 1 as it rotates, and changes the opening degree and air in the duct flow path 1; It is composed of a linear damper characterized in that the flow rate maintains a substantially linear proportional relationship.

(2) Embodiments Hereinafter, embodiments of the present invention will be specifically described based on the attached drawings.

The linear damper according to the present invention communicates an air conditioner with a space to be air-conditioned, such as a room, and exhausts a predetermined amount of air from the space to be air-conditioned while supplying this predetermined amount of fresh outside air to the space to be air-conditioned. It is installed interposed in the air conditioning duct to keep the static pressure in this space constant. Therefore, among central heating and cooling air conditioning systems, dampers are provided in which the damper blade opening and air flow rate change relative to each other in a proportional relationship so that the air flow rate can be easily controlled. It is.

FIG. 1 is an explanatory side cross-sectional view of a linear damper according to an embodiment of the present invention. In the figure, a rotating shaft 3 is substantially perpendicular to the air ventilation direction on a channel wall 6 of a duct channel 1 having a rectangular cross section. It is fitted and supported in a shaft hole (not shown).

A bow-shaped arcuate plate 2 is fixed to the rotating shaft 3. The arcuate plate 2 has a cross section along an arc of a circle centered on the rotating shaft, and has a chord section and an arcuate section. In this embodiment, the circular arc plate 2 is formed so that its projected shape in the ventilation direction is the same as the shape formed by the cross-sectional inner diameter of the duct flow path 1, and the rotation axis 3 is located at the center of curvature of the circular arc portion. is fixed. A flat plate 5 is stretched over the chord part of the arc plate to form a chord part.

The arcuate plate 2 rotates within the flow path 1 around the rotating shaft 3 while forming a rectangular projected shape in the ventilation direction. The arcuate plate 2 is made of, for example, aluminum alloy, which is lightweight and has excellent strength, and is smoothly driven when rotated from the outside.

This circular arc plate 2 has a particularly simple cross section formed by a circular arc portion and a chord portion, and can be easily mass-produced by extrusion molding and can be maintained at low cost. Further, assembly and replacement work can be easily performed, and furthermore, when the present linear damper is formed in a flow path over a plurality of layers as described later, it can be manufactured particularly easily.

Further, this arcuate plate 2 is provided on one wall surface side of the flow path 1.
A housing space 4 for storing the housing space 4 is formed in a concave shape along the curvature of the circular arc portion of the circular arc plate 2.

Here, the arcuate plate 2, which has an arcuate cross section and a chord part and is fixed to the rotary shaft 3 at the center of curvature of the arcuate part, has a rectangular projected shape in the ventilation direction, and the flow path 1. The flow path is opened and closed while rotating within the circular arc plate 2, and the relationship between the rotation angle (opening degree) of the circular arc plate 2 and the air flow rate maintains a substantially linear proportional relationship. Therefore, accurate and reliable air conditioning control can be performed without sudden changes in air volume even with slight changes in opening degree.

In addition, with the above configuration, the opening degree of the flow path 1 can be set in the entire range from fully closed to fully open, and pressure loss can be kept to a minimum even in the fully open state, so the opening can be adjusted over a wide range. Proportional control of air flow rate becomes possible. In the linear damper according to the present invention, the rotation angle θ of the rotating shaft 3 and the ratio of the flow area of the open portion to the total cross-sectional area of the flow path 1 are calculated by the following formula: X = 1/2 {1-√2 (+45゜)}, and X and θ have a nearly proportional relationship.

Moreover, the measured values shown in Γ in FIG. 2 were obtained experimentally, and it was revealed that the two are displaced in a substantially proportional relationship, as shown by the solid line connecting them.

The linear damper according to the present invention may be configured in multiple stages as shown in FIG. 3, or rather, when installed in a large-diameter duct used in a central heating and cooling system, it is used in a multi-stage configuration like this. Even in this case, since it is only necessary to form the circular arc plate 2 fixed to the rotating shaft 3 at the center of curvature, a multi-stage configuration can be easily achieved. Since it is a flat wall as it is, it can be assembled with ease in terms of space and structure.

FIG. 4 shows another embodiment of the linear damper of the present invention, in which a shield weir plate 7 is made to protrude from the bottom of the channel wall 6, and a housing space 4 for the arcuate plate 2 is formed behind it. be. In this embodiment, unlike the previous embodiment, the housing space 4 is not formed by further recessing the duct inner diameter itself, but the shield dam plate 7 is protruded from one side of the duct inner diameter, so that the three sides of the duct inner diameter The circular arc plate 2 moves in and out of the cross section formed by the shield dam plate 7 to improve the linear characteristic in the ratio of opening degree and air flow rate. In contrast, it is only necessary to attach the shield weir plate to the inner surface of the duct, making it easy to manufacture the linear damper.

Effects of the Invention As explained above, according to the linear damper according to the present invention, there is a rotating shaft provided substantially perpendicular to the air ventilation direction in the duct flow path having a rectangular cross section, and a damper centered around this rotating shaft. It has an arcuate cross section along one arc on a circle, and a chord part, and is fixed to the rotating shaft at the center of curvature of the arc part, and is configured to have a rectangular projected shape in the ventilation direction, while passing through the flow path. a rotating arc plate; formed on one wall side of the flow channel;
Since it is equipped with a storage space for storing the arcuate plate, it has a simple configuration, keeps manufacturing costs low, maintains the relationship between the blade opening degree and the air flow rate in a linear proportional relationship, and Direct control of the air conditioning system can be performed accurately and reliably using the damper device itself without requiring an air flow rate measuring device or the like.

In particular, since the arcuate plate has an arcuate cross section consisting of an arcuate portion and a chord portion, it can be easily mass-produced by extrusion molding.

In addition, a storage space is formed on one wall side of the flow channel to store the arc plate, and only a part of the rotation locus drawn by the arc portion as the arc plate rotates is moved into and out of the flow channel. With this configuration, the opening degree of the flow path can be set in the entire range from fully closed to fully open.
Moreover, since the pressure loss can be kept to a minimum even in the fully open state, linear proportional control of the opening degree and air flow rate is possible over a wide range.

[Brief explanation of the drawing]

FIG. 1 is a side cross-sectional explanatory diagram showing one embodiment of a linear damper according to the present invention, FIG. 2 is a flow rate characteristic graph showing the relationship between flow rate and rotation angle in the same embodiment, and FIG. FIG. 4 is an explanatory diagram showing the open/closed state of an example in which the linear damper of the present invention is provided in multiple stages. FIG. 4 is an explanatory diagram showing another embodiment of the present invention. FIG. 5 is an explanatory diagram showing the structure of a conventional damper. be. 1... Channel, 2... Arc plate, 3... Rotating shaft, 4
... Accommodation space, 5 ... String section, 6 ... Channel wall, 7 ...
...shield dam board.

Claims (1)

[Scope of Claim for Utility Model Registration] A space to be air-conditioned is connected to an air conditioner, a predetermined amount of air is exhausted from the space to be air-conditioned, and a predetermined amount of fresh outside air is supplied to the space to be air-conditioned. A damper is provided in the air conditioning duct in order to keep the static pressure in this space constant at all times, and the rotary shaft 3 is provided approximately perpendicular to the air ventilation direction in the duct flow path 1 having a square cross section. and an arcuate cross-section along an arc on a circle centered on the rotational axis, and a bow-like chord part, which is fixed to the rotational axis 3 at the center of curvature of the arcuate part, and has a projected shape in the ventilation direction. The flow path 1 is configured in a rectangular shape.
The arcuate plate 2 is provided with an arcuate plate 2 that rotates inside the passageway, and a storage space 4 formed on one wall side of the flow path 1 for storing the arcuate plate 2. A linear damper that enters and exits the flow path 1 from the space 4 and is characterized in that the opening degree and the air flow rate in the duct flow path 1 maintain a substantially linear proportional relationship.