JPH0771631A - Flow regulating mechanism - Google Patents

Abstract

PURPOSE:To improve flow characteristic by generating no drift in a fluid passing to decrease turbulence. CONSTITUTION:A damper part 1 is mounted in a duct 2 and provided with blades 13, 14 and 15, 16 in the upstream and the downstream of rotatably connecting one end sides by hinges 11, 12, to connect also the blades in the upstream and the downstream by hinges 17, 18. A screw mechanism 3 is provided with a handle 31, screw shaft 32 connected to this handle, right/left screw nuts 33, 34 screwed to a thread of the screw shaft 32 and respectively connected to the hinges 17, 18, etc., and fixed to the duct 2 by a mounting bracket 35, to change an opening area in the duct by moving parts of the hinges 17, 18 in a direction of arrow mark B. In this way, no drift is generated with small turbulence of a flow, and the opening cross sectional area is linearly changed, to obtain a good flow characteristic.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a flow rate adjusting mechanism for adjusting the flow rate of a fluid such as water or air flowing in a pipe or a duct.

[0002]

2. Description of the Related Art For example, as the air volume control damper in a duct, a damper having a shape shown in FIG. However, since the damper having such a shape adjusts the air volume by inclining the blades 100, there is a problem that the streamline inclines and uneven flow occurs. As a damper for preventing such uneven flow, an opposed blade damper as shown in FIG. 1B is known. However, in this type of damper, there are two types of fluid passage portions, a cross-sectional enlarged portion and a cross-sectional reduced portion, so that the flow after passing through the damper is greatly disturbed. Further, in the damper as described above, since the flow rate is adjusted by rotating the central portion of the blade 100, the rotation angle and the cross-sectional area of the opening do not correspond linearly, and therefore the flow rate characteristic is not good.

On the other hand, as a damper with improved flow rate characteristics, a damper has been proposed in which a convex plate is attached to the blade so that the rotation angle and the opening cross-sectional area are proportional to each other (see Japanese Utility Model Publication No. 5-28428). . However, the damper having such a shape has a problem that the structure is complicated and the resistance when the damper is fully opened is large because the cross-sectional area of the convex plate is large.

[0004]

SUMMARY OF THE INVENTION The present invention solves the above problems in the prior art, and the invention of claim 1 is to provide a flow rate adjusting mechanism in which no drift occurs, and the invention of claim 2 In addition to the above, it is an object of the present invention to provide a flow rate adjusting mechanism in which the turbulence of the fluid that has passed through the valve body is small, and the invention of claim 3 is, in addition to the object of the invention of claim 1 or 2,
It is an object of the present invention to provide a flow rate adjusting mechanism with improved flow rate characteristics without increasing the resistance when fully opened or complicating the structure.

[0005]

In order to solve the above-mentioned problems, the present invention provides a flow rate adjusting mechanism for adjusting a flow rate of a fluid by disposing a valve element in a flow path. The valve body is provided with a plate-shaped member whose one end side is rotatably coupled, and an opening / closing means for opening and closing the plate-shaped members is provided. The invention according to claim 2 is characterized in that, in addition to the above, The member is composed of an upstream part and a downstream part in the flow direction of the fluid.
The invention of claim 3 is characterized in that, in addition to the invention of claim 1 or 2, the opening / closing means has an end opposite to the one end of the plate member in the flow direction. It is a moving means for moving in a direction perpendicular to.

[0006]

According to the first aspect of the invention, the plate-shaped members forming the valve body are rotatably coupled to each other, and the opening / closing means for opening / closing the valve is provided. Therefore, by operating the opening / closing means, the plate-shaped members can be operated. The flow rate can be adjusted by opening and closing the to change the opening cross-sectional area of the flow path. In this case, for example, when the coupling side of the plate-shaped members is arranged on the upstream side in the flow direction, the fluid is free to flow between the free end of the plate-shaped members and the flow path or when a plurality of valve bodies are provided. Since it flows between the ends, it always flows in the cross-sectional reduction direction. As a result, the flow line is not bent to cause uneven flow, and the flow turbulence after passing through the valve body is relatively small.

According to the second aspect of the present invention, the plate-shaped member is composed of the upstream side portion and the downstream side portion in the flow direction, which are connected to each other. Therefore, when the plate-shaped member is opened, the upstream side portion is formed. The cross-sectional area of the flow path is reduced in the portion, and the cross-sectional area is increased in the downstream portion. Therefore, the rapid expansion of the flow passage cross-sectional area is suppressed on the downstream side of the minimum cross-sectional area portion, and the turbulence of the flow due to the generation of a vortex is reduced.

According to the third aspect of the invention, since the opening / closing means of the valve body is the moving means for moving the other end side of the connecting portion of the plate-like members in the direction perpendicular to the flow direction, the moving means is plate-like. The opening cross-sectional area through which the fluid passes changes linearly with the amount of movement of the other end of the member. Therefore, the flow rate changes linearly with the movement amount, and good flow rate characteristics can be obtained.

[0009]

1 shows the structure of a damper device as a flow rate adjusting mechanism of an embodiment. The damper part 1 as a valve body is attached in a duct 2 as a flow path, and one end side is hinge 1
It is provided with upstream and downstream blades 13, 14 and 15, 16 which are plate-like members rotatably coupled by 1 and 12. The blades on the upstream side and the blades on the downstream side are also connected by the hinges 17 and 18. In this case, vanes 13 and 1
4 and 15 and 16 preferably have the same shape, but the upstream vanes 13 and 14 and the downstream vanes 15 and 16
And do not necessarily have the same shape. Damper part 1
Depending on the size of the duct 2, one or more are provided in the duct 2. As an opening / closing means for opening / closing between the plate-like members, the hinges 17 and 18 at the opposite ends of the blades 13, 14 and 15, 16 are moved in the direction of arrow B, which is perpendicular to the direction of arrow A, which is the direction of fluid flow. A screw mechanism 3 is provided as an example of moving means. The screw mechanism 3 includes a handle 31, a screw shaft 32 connected to the handle 31, a right screw nut 33 and a left screw nut 34, which are screwed with the screw of the screw shaft 32 and connected to the hinges 17 and 18, respectively. It is fixed to the duct 2 by 35.

FIG. 2 shows an example of a screw mechanism when the width of the duct 2 is wide. In such a case, for example, as shown in the figure, a shaft 36 attached to the handle 31 is rotatably supported by a bracket 35 'attached to the duct 2, and screws provided on both sides in the duct width direction via a bevel gear 37. The rotation is transmitted to the shafts 32, 32.

FIG. 3 shows a state in which the handle 31 of the screw mechanism 3 is operated to open and close the damper section 1. For example, when the handle 31 is rotated to the right, the right-hand thread nut 33 and the left-hand thread nut 34 move toward each other, narrowing the space between the hinges 17 and 18 connected to the right-hand thread nut 33 and the left-hand thread nut 34.
When the space between 15 and 16 is closed and the space between them is fully closed, the damper portion 1 is fully opened as shown in FIG. On the contrary, when the handle 31 is rotated counterclockwise, by the operation opposite to the above, the damper unit 1 is fully closed through the state of the intermediate opening shown in FIG.

According to the damper device as described above, since the width of the damper portion can be reduced by bringing the hinges 17 and 18 close to each other, the air resistance when the damper is fully opened can be reduced. For example, in a duct having a height of 900 mm and a width of 600 mm, the damper having the structure of this embodiment has an opening of 87.5% (the opening area through which the wind passes is 87.5% of the duct cross-sectional area) when fully opened. If a damper is provided and the state is 75% open as shown in FIG. 4, the air resistance is as shown in FIG.

Next, when the damper portion 1 is closed, the opening area is reduced, but the wind is simply contracted in the flow direction,
Since the streamlines are not bent as a whole, wind drift does not occur after passing through the damper. Further, the wind flows in the cross-sectional reduction direction in all the cross-sections in the duct, and since the vanes are also provided on the downstream side of the minimum cross-section area, the turbulence of the air flow after passing through the duct is small. Further, rotate the handle to rotate the hinge 1.
Since the distance between 7 and 18 is changed, the rotation angle of the handle has a linear relationship with the opening cross-sectional area in the duct 2. Therefore,
An air volume that linearly corresponds to the steering wheel rotation angle is obtained, and the damper device has good flow rate characteristics. For example, when a damper having a cross section of 300 mm square is provided as shown in FIG. 6, assuming that the opening width is d and the damper opening is 2 d / D with respect to the duct width D, as shown in FIG. The air volume changes linearly with the damper opening. And in this case
Since the damper opening 2d is proportional to the handle rotation angle,
The air volume changes linearly with the rotation angle of the steering wheel. Therefore, in the damper device as described above,
Good flow rate characteristics can be obtained without making the damper part itself a complicated structure.

Although the blades 15 and 16 are also provided on the downstream side in the above description, they may be omitted depending on the application of the damper and the installation location. Even in that case, the drift of the wind does not occur, and the relationship between the handle angle and the air volume that changes substantially linearly can be obtained. Further, although the blades 13 to 16 are flat plates in the example of FIG. 1, they may have other shapes such as a streamline shape. Further, the upstream blades 13 and 14 and the downstream blades 15 and 16 may not be symmetrical, and for example, the downstream blades may be lengthened to improve the air flow.

8 and 9 show another example of the structure of the damper section. FIG. 8A shows hinges 11 ′, 12 ′ that can be opened and closed.
An example in which thin plates 13 'to 16' are joined to 17 'and 18' is shown. In the damper of this example, the inside and outside of the damper are not completely sealed, as shown in detail in FIG. 9A shows a flexible tubular member 19 made of rubber or synthetic fiber on the outer peripheral surface of the damper shown in FIG.
The following shows an example of covering. Further, FIGS. 9B and 9C show an example in which the tubular members 19a and 19b are attached only to the corners, both ends are fixed in the former case, and only one end side is fixed in the latter case. In (a) and (b) of the figure, the inside and outside of the damper are completely sealed, and in (c), almost completely sealed.

FIG. 10 shows another example of the means for moving the valve element.
In this example, a guide plate 38 provided with a guide groove 38a is used as shown in FIG. Then, as shown in FIG. 2B, the guide plate 38 is fixed to the side surface of the duct 2, and one end side of the hinges 11, 12, 17, 18 shown in FIG. 1 is projected into the guide groove 38a, For example, a bracket 39 in which the end of the hinge 12 is fixed to the shaft 39
It is attached to a so that the shaft 39 is moved in the direction of arrow C. When the hinge 12 is moved in the direction of arrow C along the groove beside the guide groove 38a, the hinges 17 and 18 are moved to the guide groove 38a.
The hinge 11 moves along the vertical groove of a, and the hinge 11 moves symmetrically with the hinge 12. Note that, as shown in FIG. 7C, the guide plates 38 for the respective damper parts may be integrated to form a guide plate 38 'shared by a plurality of dampers. According to the moving means described above, the damper moving mechanism can be further simplified. And even in this case,
Since the moving amount of the shaft 39 and the air flow have a linear relationship, the flow rate characteristic of the damper device is good.

FIG. 11 shows another example of the opening / closing means of the valve body.
In this example, the hinge part is not directly moved, but the air bag 4 is put inside the damper part 1 and compressed air or liquid is put into and taken out of the damper part 1 through the three-way valve 5 as shown in FIG. , The air bag 4 is inflated / contracted to open / close the damper part 1. If necessary, a tension spring 6 for closing the damper part 1 is provided. Such an opening / closing means facilitates automatic or remote operation of the damper.
Further, as shown in FIG. 2B, if compressed air is taken in and out of the compressed air header 7 via the opening / closing valve 8 provided for each damper, the individual dampers can be selectively selected. It becomes possible to control opening and closing. As a result, it is possible to adjust the location where the air is blown out and to adjust the flow rate more precisely. The opening / closing means of the valve body is not limited to the moving means for moving the anti-coupling side of the plate-like member as described above, but the plate-like member may be rotated by a method such as providing a rotary shaft at the connecting portion of the plate-like member. It may be a means for opening and closing by opening. Also in this case, the effect of preventing drift is maintained.

Although the damper device for adjusting the air volume has been described above as the flow rate adjusting mechanism, the present invention can be applied to a valve device for adjusting the flow rate of other fluids such as water and oil. Further, in the above, an example in which the flow path and the valve body are rectangular is given, but the flow path and the valve body having other shapes, such as a circular tube and a plate-like member of the valve body having a semicircular shape, are given. The present invention can also be applied to.

[0019]

As described above, according to the present invention, in the first aspect of the invention, the opening / closing means changes the opening cross-sectional area of the flow path by opening and closing the plate-like member around the joint on one end side. , The streamlines are not bent in parallel and uneven flow does not occur. According to the second aspect of the present invention, since the upstream side and the downstream side plate-like members are connected, rapid expansion of the cross-sectional area is suppressed, and the turbulence of the flow can be reduced. In the invention of claim 3, since the other end side of the plate-shaped member is moved in the cross-sectional direction by the moving means, the cross-sectional area of the opening through which the fluid passes changes linearly, and good flow rate characteristics can be obtained.

[Brief description of drawings]

1A and 1B show a structure of a damper device according to an embodiment, FIG. 1A is a front view showing a part of the entire structure, and FIG. 1B is a sectional view taken along the line YY.

FIG. 2 is a front view showing the structure of a damper device of another embodiment.

FIG. 3 is a cross-sectional view showing an opened / closed state of a damper portion, (a) is a fully open state, (b) is an intermediate opening degree, and (c) is a fully closed state.

FIG. 4 is a cross-sectional view showing a state of a damper portion with an opening of 75%.

FIG. 5 is a curve diagram showing wind resistance of the damper unit.

FIG. 6 is a cross-sectional view showing the shape of a damper section in the duct.

FIG. 7 is a curve diagram showing the relationship between the opening of the damper section and the air volume.

FIG. 8 is a cross-sectional view showing another structural example of the damper part, (a)
Shows the whole, (b) shows a hinge part.

9A is a cross-sectional view showing another structural example of the damper part, and FIGS. 9B and 9C are cross-sectional views showing another structural example of the hinge part.

FIG. 10A is a front view of a guide plate, and FIG.
Is a front view of a blade moving device equipped with this, and (c) is a front view of a guide plate common to each damper section.

FIG. 11A is a cross-sectional view of a damper unit incorporating an air bag, and FIG. 11B is an explanatory diagram of the opening / closing device thereof.

FIG. 12 is a cross-sectional view of a conventional damper, (a) shows a parallel wing type, and (b) shows an opposed wing type.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 damper part (valve body) 2 duct (flow path) 3 screw mechanism (moving means, opening / closing means) 4 air bag (moving means, opening / closing means) 11, 12 hinge (one end side) 13 vane (upstream side plate member) 14 Blades (Upstream Plate Member) 15 Blades (Downstream Plate Member) 16 Blades (Downstream Plate Member) 17, 18 Hinge (End on Other Side)

Claims (3)

[Claims] 1. A flow rate adjusting mechanism for adjusting a flow rate of a fluid by arranging a valve element in a flow path, wherein the valve element includes a plate-shaped member rotatably connected at one end side thereof. A flow rate adjusting mechanism comprising an opening / closing means for opening and closing the space. 2. The flow rate adjusting mechanism according to claim 1, wherein the plate-shaped member includes an upstream side portion and a downstream side portion in the flow direction of the fluid, which are connected to each other. 3. The opening / closing means is a moving means for moving an end of the plate-shaped member opposite to the one end in a direction perpendicular to the flow direction. Flow rate adjustment mechanism.