JPH02157562A - Airflow control device and method thereof - Google Patents

Abstract

PURPOSE:To reduce a cost by a method wherein an outlet damper is controlled according to demand air flows from respective room thermostats mounted to areas to be air-conditioned, and a cut-off damper is controlled by an air velocity sensor so that the total of air flows demanded by respective room thermostats is caused to flow in through a single inlet. CONSTITUTION:Under a state in which a cut-off damper 18 is fixed at a specified opening, if air resistance to areas 36a - 36d through outlets 22a - 22d, respectively is same as each other, even when a rotary damper 24 is rotated, the total of air flows through the outlets 22a - 22d is specified. Thus, the cut-off damper 18 controls four outlet air flows, and even when a balance between the outlet air flows is changed, no influence is exerted thereby. Since room thermostats 38a - 38d are mounted to the areas 36a - 36d, respectively, comparison with an air flow signal from an air velocity sensor 16 is effected and the cut-off damper 18 is controlled so that the total of air flows demanded by the room thermostats 38a - 38d is adjusted to an inlet airflow. This constitution air-conditions a plurality of areas through the working of an airflow control device, and enables reduction of a cost of the whole of an air conditioning system.

Description

[Detailed Description of the Invention] [Industrial Application Field] The present invention relates to an air volume control device and method, and particularly to an air volume control device and method, in which one inlet and a plurality of exits are formed, and two dampers are used to control the inlet air volume and each outlet air volume. The present invention relates to a novel air volume side flo device and method for controlling.

(Prior art) In a conventional air conditioning system, as shown in FIG. The unit 4 is a room thermostat (hereinafter simply referred to as "room thermostat") 6 installed in a space or area 5 to be air-conditioned by the unit.
The air volume is controlled according to the detected temperature difference.

[Problems to be Solved by the Invention] In the prior art shown in FIG. 12, the VAV unit 4 and the room thermostat 6 are a pair, so when it is desired to subdivide the space or area to be individually air-conditioned, it is necessary to Therefore, it is necessary to install the VAV unit 4 and the room thermostat 6, which not only requires a large installation space but also increases costs.

Therefore, the main objective of the present invention is to provide an air volume control device and method that can save installation space and cost when subdividing individual air conditioning areas.

[Means to solve the problem]

The present invention provides a casing having one inlet and a plurality of outlets formed downstream of the inlet, a closing damper provided between the inlet and the outlet in the casing, and a closing damper provided downstream of the closing damper and having a plurality of outlets. This is an air volume control device that is provided upstream and includes an outlet damper for setting the air volume of each of a plurality of outlets.

[Effect]

Each area is conditioned by airflow from each outlet.
Each room thermostat is provided with a room thermostat, and the outlet damper is controlled according to the required air volume from each room thermostat. The closing damper is controlled, for example, by a wind speed sensor provided at the inlet so that the total amount of air required by each room thermostat flows in from one inlet.

〔Effect of the invention〕

According to this invention, multiple areas can be air-conditioned with one air volume control device. Therefore, even when areas to be individually air-conditioned are subdivided, the installation space for the air volume control device and related ducts, etc. is small. Moreover, together with the ease of construction of ducts, etc., the cost of the entire air conditioning system can be significantly reduced. Moreover, the airflow within the area can be changed to improve comfort.

The above objects, other objects, features and advantages of the present invention will become more apparent from the following detailed description of embodiments with reference to the drawings.

(Embodiment) FIG. 1 is a perspective view showing an embodiment of the present invention. The VAV unit IO of this embodiment includes a casing 12 having a rectangular cross section and a circular planar portion formed at the rear thereof, and a branch duct 3 shown in FIG. 4 or 12, for example, at one end of the casing 12. A connected inlet 14 is formed. A wind speed sensor 16 is provided at the inlet 14.

In this embodiment, the wind speed sensor 16 uses, for example, a Karman vortex. however,
Any other configuration may be used.

A closing damper 18 is provided in the rectangular section of the casing 12 on the downstream side of the inlet 14.
is rotated in the direction of arrow 20 by shaft 18a. That is, the opening degree of the closing damper 18 is adjusted based on a signal from the wind speed sensor 16 provided at the inlet 14, thereby adjusting the inlet air volume.

Further, in the rear circular plane portion of the casing 12, there are four outlets 22a, 22b, 2 for allowing air to flow out in a direction perpendicular to the flow direction of the air flow that has flowed in from the inlet 14.
2c and 22d are formed. Each of these outlets 22a
22d are formed at positions every 90 degrees on the same circumference of the planar circular portion, as can be clearly seen especially from FIG.

Although not shown, each of the outlets 22a to 22d is connected to a duct leading to an area to be air-conditioned depending on the air volume from each outlet.

A rotary damper 24 is provided in the above-mentioned planar circular portion in the casing 12, that is, directly below the outlets 22a to 22d, and the rotary damper 24 is rotatably supported by a shaft 24a in the direction of an arrow 26.

As shown in FIG. 2, the diameter of the rotary damper 24 is selected to be large enough to prevent all outlets 22a-22d from being partially closed at all times. At the same time, a notch 28 having a diameter substantially equal to or larger than the opening diameter of the outlets 22a to 22d is formed in a part of the outer peripheral edge of the rotary damper 24.

Therefore, in this embodiment, the hatched portions in FIG. 2 are the openings of the respective outlets 22a to 22d. In this way, in this embodiment, depending on the stopping position of the notch 28 of the rotary damper 24, 70% of the total air volume is delivered from one of the outlets 22a to 22d, and 10% of the total air volume is delivered from the remaining outlets.
The air volume balance is set so that % flows out respectively. However, the number of outlets 22a to 22d and the air volume balance can be changed as necessary.

The opening degree of the aforementioned closing damper 18 is controlled by a motor 30 shown in FIG. 3, and the rotary damper 24 is rotated by a motor 32 also shown in FIG.
8 is intermittently stopped every 90 degrees, that is, every outlet 22a to 22d.

Such a VAV unit IO is connected to a main duct 2 extending from an air conditioner 1 via a branch duct 3, as shown in FIG. That is, the branch duct 3 is connected to the inlet 14 of the casing 12. And each exit 22a
Ducts 34a-34d extending from 22d are connected to corresponding areas 36a-36d. Each area 36
A to 36d are provided with room thermostats 38a to 38d, and signals (representing the difference between the set temperature and the actual temperature) from these room thermostats 38a to 38d are given to the control circuit 40. In addition, this plagiarism 1 circuit 40 has a population of 14
A signal from the aforementioned wind speed sensor 16 provided at the wind speed sensor 16 is also provided. The control circuit 40 controls each room thermostat 38a to 38d.
and the signal from the wind speed sensor 16,
The motors 30 and 32 (FIG. 3), namely the closing damper 18 and the rotary damper 24, are controlled.

In such an air conditioning system, the closing damper 1
8 is fixed at a constant opening, each outlet 22a ~
If the air resistance from 22d to each area 36a to 36d is the same, even if the rotary damper 24 is rotated, each outlet 2
The total amount of air coming out from 2a to 22d, that is, the amount of air that should flow into the inlet 14 (inlet air amount) is constant. therefore,
The closing damper 18 operates in the same manner as a normal VAV unit. In other words, the closing damper 18 controls the total of the four outlet air volumes, and no matter where the rotary damper 24 is located, that is, even if the balance of each outlet air volume changes,
It's not affected by that.

However, room thermometer 38a is installed in each area 36a to 36d.
38d, the closing damper 18, that is, the motor 30 is controlled by comparing the air volume signal from the wind speed sensor 16 so that the total air volume required by the four room thermometers 38a to 38d becomes the inlet air volume. control wholesale.

Each of the room thermostats 38a to 38d in this embodiment has a response characteristic as shown in FIG. and when the temperature difference is 11°C, a required air volume of 100 m/h is output.

Now, assuming that the notch 28 of the rotary damper 24 is stopped at the position shown in FIGS. 2 and 3, 7
00 rrr/h, and air volume of 100 rrr/h flows from 22c to 22d, respectively.

This balance of air volume at each outlet (7: 1: 1
:1) is preset by the design of the rotary damper 24, as described above.

Then, when the rotary damper 24 is rotated 90 degrees in the direction of the arrow 26 (FIG. 2), at that point, the air volume at the outlet 22b becomes 700 nf/h, and the air volume at the other outlets 22a, 22c, and 22d respectively. 100rr! /h.

Here, if the required air volume from the four room thermostats 38a to 38d is all 25 On (/h), the rotary damper 24 will stop for 25 seconds every time it rotates 90 degrees, assuming that one rotation is 100 seconds. Therefore, the air volume change at the outlet 22a at that time is as shown in FIG.

Then, the remaining exits 22b to 22d each have 250
rrr/h flows. At that time, the closing damper 18 has an inlet air volume of 1000 (-250X4)rri'
IIJ '+ is distributed so that /h.

Next, one room thermometer, for example 38b, is 250rr.
r/h, other room thermos 38a, 38c and 38d
Assume that the required airflow rate is 100 rd/h. In this case, the notch 28 of the rotary damper 24
It stops at position b for a relatively long time, and the other exits 22a, 22
Only relatively short stops are required at positions c and 22d. According to the calculation, the time ratio is 13.5 seconds at the exit 22a, assuming that one rotation of the rotary damper 24 is 100 seconds.
6 seconds, 59 seconds at exit 22b, 13.6 seconds at exit 22c and 13.6 seconds at exit 22d. Exit 2 at this time
The change in air volume of 2b is shown in FIG.

Here, when compared with the case of Fig. 7, in the case of this Fig. 8, the total air volume is 550 (=250 + 100X3) r
Since it is controlled by rf/h, the rotary damper 22
When it stops at position b, it is 385 (=550x0.7) bo/h, and when it does not match, it is 55 (=550x0.1
) The air volume is 0/h. Other exits 22a at this time~
The changes in air volume of each of 22c and 22d are as shown in FIG.

Here, with reference to FIG. 5, the general procedure of control will be described in detail in Section 3, based on the above-mentioned specific case.

The control routine shown in FIG. 5 is, for example, 0. It is configured as a timer-interrupted routine every 5 seconds and is executed in response to an included routine every 0.5 seconds. However, steps Sl, S7. Sll and S15 are each constructed and executed in the form of separate subroutines.

Each room thermostat 38a input in step Sl
Based on the signals from ~38d, the required air volume Qn of each outlet 22a~22d is determined in step S3.

Next, in step S5, the total wind LtQ is determined from the required air volume of each outlet. Then, in the next step S9, the operation of the closing damper 18, that is, open, close, or stop, is determined based on the data or signal from the wind speed sensor 16 inputted in step S7. That is,
The total air volume Q and the actual air volume from the wind speed sensor 16 are compared to determine in which direction the closing damper 18 should be driven or stopped. Then, in accordance with the determined operation, the closing damper motor 30 is controlled in a subroutine indicated by step Sit.

On the other hand, the rotary damper 24 is controlled in steps S13 and S15. That is, in step 313, the required time for the notch 28 to stop is determined for each of the exits 22a to 22d.

That is, let Qn be the required air volume of any outlet (required air volume M of the room thermostat), Q be the total air volume (inlet air volume), let Tn be the required time of any outlet, and let T be the rotation time of the rotary damper 24. , the required time Tn is expressed as Tn=((Qn-0,IQ))T10.6Q.

Then, according to the determined time, step S15
In the subroutine shown in , the rotary damper motor 32
control.

In addition, according to the above calculation formula, each case
The total air volume, the required air volume Qn of each room thermostat 38a to 38d, and the required time Tn for each room thermostat 38a to 38d are determined as shown in the attached table.

In this way, according to this embodiment, the required air volume from the four room thermostats can be individually controlled by one VAV unit. Therefore, even if the areas to be individually air-conditioned are subdivided, each area It is not necessary to provide a VAV unit in the

Furthermore, in this embodiment, since the air volume at the outlets 22a to 22d changes dramatically as shown in FIGS. 7, 8, and 9, the air flow pulsates at the time of the change. Therefore, in each of the areas 34a to 34d, the pulsating flow produces an air agitation effect, which improves the mixing of the air within the area with the incoming air, improving comfort.

FIG. 1O is a perspective view showing another embodiment of the invention,
FIG. 11 shows a rotary damper 24' used in this embodiment. This embodiment has a cylindrical rotary damper 2 with an opening at the bottom, whereas the rotary damper 24 in the embodiment of FIG.
The difference is that it is configured as 4'. That is, four outlets 22a are provided at every 90 degrees on the outer circumference of the cylindrical portion of the casing 12.
22d' is formed, and a cylindrical rotary damper 24' having a diameter smaller than the diameter of the cylindrical portion is connected to the shaft 24a'.
is rotatably supported within the casing 12 by. One hole 26' having a size corresponding to the opening of each of the outlets 22a' to 22d' is formed in the circumferential surface of the cylindrical rotary damper 24'.

The hole 26' of this cylindrical rotary damper 24' is connected to each outlet 22a.
When it stops at any position from ' to 22d', 70% of the total air volume (inlet air volume) flows out from the stopped opening, as in the previous example, and 10% flows out from the other exits. be made to do. In this embodiment as well, each outlet 22a is naturally controlled in the same manner as described above.
The air volume from ' to 22d' can be individually controlled, and the total air volume can be controlled by the closing damper 1B.

[Brief explanation of the drawing]

FIG. 1 is a perspective view showing an embodiment of the present invention. FIG. 2 is a plan view of the embodiment shown in FIG. FIG. 3 is an illustrative side view of the embodiment shown in FIG. FIG. 4 is a circuit diagram showing an example of an air conditioning system using the embodiment shown in FIGS. 1 to 3. FIG. FIG. 5 is a flow diagram showing the control of this embodiment. FIG. 6 is a graph showing the characteristics of the room thermostat. FIGS. 7 to 9 are graphs showing changes in air volume from each outlet. FIG. 10 is a perspective view showing another embodiment of the invention. FIG. 11 is a perspective view showing the rotary damper used in the embodiment shown in FIG. FIG. 12 is a circuit diagram showing a conventional air conditioning system. In the figure, IO is a VAV unit, 12 is a casing, 14 is an inlet, 16 is a wind speed sensor, 18 is a closing damper, 22a to 22d, 22a to 22d' are outlets,
24. 24' is a rotary damper, 26 is a notch, 26' is a hole,
38a to 3E3d are room thermostats, and 40 is a control device. Patent Applicant: Nikken Sekkei Co., Ltd. (and 2 others) Agent: Patent Attorney Yama 1) Righteous Person Chart Figure 2: '55 d Figure ΔT

Claims (1)

[Scope of Claims] 1. A casing having one inlet and a plurality of outlets formed downstream of the inlet, a closing damper provided between the inlet and the outlet within the casing, and a closing damper provided downstream of the closing damper. and an outlet damper provided upstream of the plurality of outlets for setting the air volume of each of the plurality of outlets. 2. The air volume control device according to claim 1, by controlling the closing damper and the exit damper,
An air volume control method that controls the inlet air volume and each outlet air volume.