JP3014189U - Variable constant air volume device - Google Patents

Abstract

(57) [Summary] [Object] The present invention aims to provide a variable constant air volume device capable of highly accurate and stable control. According to the present invention, a damper-2 for adjusting an air volume and a drift prevention rectification unit 3 are provided from an upstream side to a downstream side in a duct 1.
Further, when the wind speed sensor-4 is arranged at the center position of the opening 5 and the air flow rate is set, the damper on the upstream side is set so that the detection value of the wind speed sensor-4 on the downstream side becomes the initial air flow rate set value accordingly. It is configured to control the opening degree of -2.

Description

[Detailed description of the device]

[0001]

[Industrial applications]

 The present invention relates to a variable air volume control device for controlling the air supply amount of a room requiring individual air conditioning in a large building or the like.

[0002]

[Prior art]

 Conventionally used variable constant air volume devices include a self-powered type and a sensor type. In the case of the self-powered type, as shown in FIGS. 8 and 9, an outer cylinder c and an inner cylinder d each having a slit b formed in a duct a are provided on a shaft f mounted on a bearing plate e at regular intervals. And a wind pressure plate h positioned by a spring g inside the inner cylinder d. In this mechanism, the air flowing in the duct a flows through the slits b of the outer cylinder c and the inner cylinder d. Therefore, the flow plate area of the slit b is changed by the left and right movement of the wind pressure plate h due to the pressure difference between the upstream and the downstream of the air flow so that the flow rate is always constant. Further, the flow rate can be freely changed by rotating the outer cylinder c and changing the cross-sectional area of the slit b.

Next, in the case of the sensor type, as shown in FIG. 10, a wind speed sensor-i is provided on the downstream side in the duct a, and a damper j is provided on the upstream side thereof. Therefore, the wind speed sensor-i measures the wind speed in the duct a, and the constant air volume is maintained by opening / closing the damper j. Furthermore, the indoor temperature is detected by a thermometer and the air volume proportional to the deviation from the set temperature is adjusted by the damper j.

[0004]

[Problems to be solved by the device]

 However, in the case of the self-powered type, there is a problem that the air volume adjustment is not stable because the pressure difference is not constant due to the drift in the duct construction, and there is a problem that even a small air volume cannot be controlled. Further, in the case of the sensor type, an error occurs depending on the detection position of the sensor due to a drift in the duct construction, and a considerable control error occurs in the case of a small air volume, which causes a problem that the air volume is not constant. Therefore, in order to solve the above-mentioned problems, the present invention aims to provide a variable constant air volume device provided with a drift prevention rectification section between a wind speed sensor and a damper.

[0005]

[Means for Solving the Problems]

 The above object of the present invention can be achieved by a device having the following configuration. In other words, the gist is to use a mechanism that arranges a damper for adjusting the air flow rate and a drift prevention rectifier plate from the upstream side to the downstream side in the duct, and a wind speed sensor at the center of the opening, and set the air flow rate. Then, the opening degree of the damper on the upstream side is controlled so that the detection value of the wind speed sensor on the downstream side reaches the set air volume instruction value accordingly, and the upstream side in the duct. In addition to a mechanism in which an airflow adjusting shutter whose opening diameter is automatically changed concentrically toward the downstream side and a wind speed sensor is arranged at the center position of the opening diameter of the airflow adjusting shutter, the airflow is When the setting is made, the variable constant air volume device is characterized in that the opening of the upstream air volume adjusting shutter is controlled so that the detection value of the downstream air velocity sensor becomes the set air volume instruction value.In addition, a plurality of the above-mentioned flow rectifying plate portions are arranged to form a mechanism for correcting the flow divergence.

[0006]

[Action]

 As shown in FIG. 6, the variable constant air volume device of the present invention causes a drift due to a construction defect (engine part) of the duct 1 to be in a uniform wind velocity distribution state by the drift prevention rectifying plate portion 3. Then, the air flow whose straightening has been corrected is applied to the wind speed sensor-4 to stabilize the sensor indication value. Therefore, when the air volume is set, the damper is varied and automatically controlled by giving an instruction value according to the set air volume so that the detection value of the wind speed sensor becomes the set air volume instruction value.

Next, as shown in FIG. 7, a drift due to a construction defect (elbow portion) of the duct 1 is made to have a uniform wind speed distribution state by the air volume adjusting shutter 6. Then, the air flow whose straightening has been corrected is applied to the wind speed sensor-4 to stabilize the sensor indication value. Therefore, when setting the air volume, the opening value of the air volume adjusting shutter 6 is automatically changed by giving an instruction value according to the set air volume so that the detected value of the air velocity sensor becomes the set air volume instruction value.

[0008]

【Example】

 Hereinafter, the variable constant air volume device according to the present invention will be described in detail with reference to the drawings showing an embodiment thereof. Embodiment 1 As shown in FIG. 1, a damper-2, a drift prevention rectifying plate portion 3 and a wind speed sensor-4 are included in the duct 1 from the upstream side to the downstream side of the wind direction. Therefore, as shown in FIG. 2, the drift prevention rectifying plate portion 3 is formed in a quadrangular pyramid shape, and the wind speed sensor 4 is arranged at the center position of the opening 5.

Next, FIG. 3 shows another example of the non-uniform flow prevention rectifying plate portion 3, in which a plurality of non-uniform flow prevention rectifying plate portions 3 are provided between the damper-2 and the wind speed sensor-4. As shown in FIG. 4, the non-uniform flow prevention rectifying plate portions 3 and 3 are configured to alternately correct the non-uniform flow in the duct 1 by the two non-uniform flow prevention flow regulating plate portions 3 and 3. The non-uniform flow prevention rectifying plate portion 3 may have a conical shape or a plate shape in addition to the quadrangular pyramid shape. The point is that the wind velocity sensor has a shape such that the air current corrected for the non-uniform current can be applied. It is desirable to do.

Embodiment 2 As shown in FIG. 5, an air volume adjusting shutter 6 and a wind speed sensor 4 are included from the upstream side to the downstream side of the wind direction in the duct 1. Therefore, the air volume adjusting shutter 6 has a mechanism in which the opening diameter A thereof can be freely changed concentrically by the shutter driving device 7. Further, the wind speed sensor 4 is placed at the center of the opening diameter A. Position it. As the mechanism of the air volume adjusting shutter-6, a mechanism in which the opening diameter can be freely changed in a concentric shape in a plane is also conceivable.

[0011]

[Effect of device]

 As described above, according to the present invention, the influence of non-uniform flow due to a defect in duct construction is minimized by the non-uniform flow prevention rectification unit, and a maximum air flow adjustment device is provided in front of the non-uniform flow prevention rectification unit. Stable air volume control is possible from a small volume to a small volume.

[Brief description of drawings]

FIG. 1 is an overall explanatory diagram of a first embodiment of the present invention.

FIG. 2 is a perspective view showing the shape of the same drift prevention straightening plate portion.

FIG. 3 is an explanatory diagram showing another example of the first embodiment of the present invention.

FIG. 4 is a perspective view showing the shape of the same drift prevention straightening plate portion.

FIG. 5 is an overall explanatory view of a second embodiment of the present invention.

FIG. 6 is an explanatory view of the operation of the first embodiment of the present invention.

FIG. 7 is an explanatory view of the operation of the second embodiment of the present invention.

FIG. 8 is an explanatory view showing a constant air volume mechanism of a conventional self-powered variable constant air volume device.

FIG. 9 is an explanatory view showing a variable air volume mechanism of a conventional self-powered variable constant air volume device.

FIG. 10 is an explanatory diagram showing a conventional sensor-type variable constant air volume mechanism.

[Explanation of symbols]

 1 Duct 2 Damper 3 Non-uniform flow prevention rectifying plate 4 Wind speed sensor 5 Opening 6 Airflow adjustment shutter

Claims (3)

[Scope of utility model registration request] 1. A mechanism in which a damper for adjusting the air flow rate, a drift prevention rectifying plate portion, and a wind speed sensor are arranged in the center of the opening of the duct from the upstream side to the downstream side in the duct, and the air flow rate is controlled. When set, a variable constant air volume device is characterized in that the opening degree of the damper on the upstream side is controlled so that the detection value of the wind speed sensor on the downstream side becomes the set air volume instruction value accordingly. 2. The variable constant air volume device according to claim 1, wherein a plurality of the non-uniform flow prevention straightening vanes are arranged. 3. An air volume adjusting shutter whose opening diameter can be freely changed concentrically from the upstream side to the downstream side in the duct, and a wind speed sensor at the center position of the opening diameter of the air volume adjusting shutter. When the air volume is set, the upstream air volume adjustment shutter-opening is controlled so that the detection value of the downstream wind speed sensor corresponds to the set air volume instruction value. Variable constant air flow device.