JPH0248713B2 - KUKIMAKUKOZOBUTSUNOKUDOSEIGYOSOCHI - Google Patents

Description

[Detailed Description of the Invention] (Industrial Application Field) The present invention relates to a drive control device for an air membrane structure,
In particular, the present invention relates to an air membrane structure drive control device suitable for driving in an unmanned state.

(Prior Art) This type of air membrane structure is maintained in a predetermined shape by supplying air into the interior thereof using a blower to increase internal pressure. for that purpose,
It is necessary to constantly feed an amount of air into the air membrane structure that is appropriate for the situation in which the air membrane structure is placed. Conventionally, this adjustment of the air supply was performed by turning on and off the power supply to the drive motor of the blower according to external conditions, or by preparing multiple blowers and adjusting the power supply to the drive motor of the blower. This was done by selectively driving the blower. In addition, the conventional method of adjusting the supply air is to leave the blower in a constant operating state, place a damper in the blower duct connected to the blower, and change the opening degree of this damper. Things were also being done.

However, driving a blower using this conventional method has the following drawbacks. That is, by repeatedly turning on and off power to the drive motor of the blower, a large amount of power is consumed. This is particularly noticeable when the external wind changes rapidly, such as during seasonal winds.

In the case of providing a damper and changing its opening, the drive motor of the blower always operates at the specified rated output, so the drive motor consumes a certain amount of power regardless of the damper opening, that is, the specified air flow rate. do. Therefore, even if the pressure required for the air membrane structure is low, the amount of air blown is suppressed by the damper, resulting in completely unnecessary power being consumed in the drive motor.

The noise caused by the blower repeatedly starting and stopping becomes considerable.

Repeated activation and deactivation of the blower can cause malfunctions, and unattended operation increases the likelihood of malfunctions.

In order to prevent the air membrane structure from collapsing due to gusts of wind, the pressure within the air membrane structure must be increased as quickly as possible.

Furthermore, in areas with heavy snowfall, when it snows, it is necessary to increase the pressure within the air membrane structure to prevent the air membrane structure from collapsing due to snow accumulation (problem to be solved by the invention). This was done in consideration of the above-mentioned actual situation, and the problems it aims to solve include not only minimizing power consumption and noise, but also achieving complete automation, and furthermore, in areas with heavy snowfall. It is an object of the present invention to provide an air membrane structure drive control device that operates reliably even in

(Means for Solving the Problems) The means taken by the first invention of the present application to solve the above problems are: (a) wind speed detection means for detecting wind speed in the vicinity of the air membrane structure; (b) pressure detection means for detecting the pressure within the air membrane structure; (c) maximum wind speed value determination means for determining a maximum wind speed value based on the signal from the wind speed detection means; and (d) this maximum wind speed. means for comparing and calculating the signal from the value determining means and the signal from the pressure detecting means to generate a frequency conversion signal; (e) an inverter for converting the frequency of the driving power source in response to the frequency conversion signal; ) An air membrane structure drive control device comprising a drive motor for a blower driven by a drive power source whose frequency is converted by a signal from the inverter, and the means adopted by the second invention are: (b) Wind speed detection means for detecting wind speed near the air membrane structure; (B) Pressure detection means for detecting pressure within the air membrane structure; (c) Snow accumulation for detecting snow accumulation on the air membrane structure. (d) maximum wind speed value determining means for determining a maximum wind speed value based on a signal from the wind speed detecting means; and (e) a signal from the maximum wind speed value determining means, the pressure detecting means, and snow detection. (f) an inverter that converts the frequency of the driving power source in response to the frequency conversion signal; (g) a signal from the inverter that converts the frequency of the drive power source; The present invention is an air membrane structure drive control device comprising a drive motor for a blower driven by a converted drive power source.

In other words, this air structure membrane structure drive control device is
As is clear from FIG. 1, the wind speed detecting means 20 detects the internal and external conditions of the air membrane structure 10, that is, the wind speed at the installation location of the air membrane structure 10, and the pressure inside the air membrane structure 10 is detected by pressure detection means 20. The means 30 and the snow detecting means 40 constantly observe whether there is snow on the air membrane structure 10 or not. Among these, from the wind speed value observed by the wind speed detection means 20,
A maximum wind speed value determining means 50 determines the maximum wind speed value within a certain time interval. A signal corresponding to the wind speed value determined by the maximum wind speed value determination means 50 is sent to the frequency conversion signal generation means 60, and the frequency conversion signal generation means 60 receives a signal from the pressure detection means 30 (and the snow detection means 40). A signal is sent. Frequency conversion signal generation means 6
0, from the maximum wind speed value determination means 50 and the pressure detection means 30 (in the case of the first invention), or from the maximum wind speed value determination means 50, the pressure detection means 30, and the snowfall detection means 40 (in the case of the second invention). In order to determine the rotation speed of the blower 11 suitable for protecting and maintaining the air membrane structure 10 by comparing the signals of the select. By sending a signal based on this selection to the inverter 70, the inverter 70 supplies power at a predetermined frequency to the drive motor 12 of the blower 11.

(Function) By employing the above configuration, the air membrane structure 10 of the present invention has the following function. In other words, when the wind speed around the air membrane structure 10 increases, the maximum wind speed value corresponding to the change is determined by the maximum wind value determination means 50, and the electric power supplied to the drive motor 12 is determined in accordance with this. is changed to a larger value by the inverter 70. As a result, the blower 11 rotates at a higher speed than before, and a large amount of air is sent into the air membrane structure 10 by the blower 11.
The internal pressure is maintained at a high value suitable for external high wind conditions. Furthermore, when the wind speed around the air membrane structure 10 decreases, the rotational speed of the blower 11 is reduced accordingly, and the supply of air into the air membrane structure 10 by the blower 11 is reduced.

In addition, when the air membrane structure drive control device is further provided with the snow detection means 40 for the air membrane structure 10 that performs such a basic operation, even if the snow detection means 40 is Even if the pressure is suitable for the external wind conditions, in order to increase the internal pressure so that the air membrane structure 10 is not crushed by the snow on the air membrane structure 10,
An appropriate frequency is selected in the frequency conversion signal generating means 60 so as to increase the rotation speed of the blower 11. As a result, the drive motor 12 rotates at high speed, a large amount of air is supplied into the air membrane structure 10, and the pressure inside the air membrane structure 10 is increased to cope with snow accumulation.

(Example) Specific examples of the present invention will be described below based on the drawings. FIG. 2 shows a schematic configuration of a drive control device for an air membrane structure 10 embodying the present invention. The air membrane structure 10 is formed by airtightly covering a certain space with a flexible sheet, and maintains a certain shape due to internal pressure even without pillars. Further, the specific dimensions of the air membrane structure 10 exemplified in this example are 40 m long, 20 m wide, and 12 m high, and its volume is about 6400 cubic meters. Note that an entrance/exit (not shown) is formed in a part of this air membrane structure 10. This air membrane structure 10
The blower 1 is driven by a drive motor 12.
1 is connected, and by appropriately changing the amount of air supplied by this blower 11, the pressure within the air membrane structure 10 can be set or changed to an appropriate value. In addition, in this air membrane structure 10, wind speed detection means 20, pressure detection means 30
The situation is grasped by the snow detection means 40.

The wind speed detection means 20 is disposed outside and near the air membrane structure 10 and constantly observes the wind speed in the vicinity of the air membrane structure 10. This wind speed detection means 20 transmits the observed wind speed as a pulse signal to maximum wind speed value determination means 50, which will be described later. There are various possible installation locations for the wind speed detection means 20, but according to the inventors' experiments,
It seems best to place it at a position a little away from the air membrane structure 10 and at the same height as the top of the air membrane structure 10. If it is installed directly on the top of the air membrane structure 10, it is not preferable because the wind speed value will be higher than the actual wind speed, and even if it is too far away from the air membrane structure 10, the situation surrounding the air membrane structure 10 can be grasped. This is because it is not suitable for doing so.

On the other hand, the air membrane structure 10 has pressure detection means 30.
was placed. This pressure detection means 30 is of a known type, and after constantly observing both the pressure inside the air membrane structure 10 and the pressure outside it and converting the differential pressure into an electrical signal, it generates a frequency conversion signal, which will be described later. Means 6
0.

The snow detection means 40 utilizes the phenomenon that the ceiling of the air membrane structure 10 lowers when snow accumulates on the air membrane structure 10, and detects when the ceiling lowers and generates an electrical signal. This signal is transmitted as a signal to frequency conversion signal generation means 60, which will be described later. Although various configurations are conceivable for the snow accumulation detection means 40, in the case of this embodiment, the configuration is as follows. In other words, the light receiver 42 that receives light in a certain direction is attached to the ceiling of the air film structure 10, and the light emitter 41 facing the light receiver 42 is connected to the air film when the air film structure 10 is fully expanded. It was installed under the structure 10. The reason why the light receiver 42 is attached to the ceiling side of the air film structure 10 is that when the film body constituting the air film structure 10 is transparent, sunlight is incident on the light receiver 42. This is to prevent malfunction. Thereby, when the air film structure 10 is in a completely expanded state, the light receiver 42 receives the light from the light emitter 41 and issues a normal signal to the frequency conversion signal generating means 60.
Furthermore, if snow accumulates on the air membrane structure 10 and its ceiling lowers, the direction of light emission from the light emitter 41 will shift from the light receiver 42.
cannot receive the light from the light emitter 41 and issues an abnormal signal to the frequency conversion signal generating means 60.

Next, an outline of an electric circuit for controlling the operation of the membrane structure according to the present invention will be explained with reference to FIG. Electrical signals from the wind speed detection means 20 and the pressure detection means 30 in the first invention, and from the snow detection means 40 in the second invention are outputted to the input port. These wind speed detection means 2
0, the pressure detection means 30 and the snowfall detection means 40 are
Each state is converted into a digital signal and constantly output to the input port. The signal output to this input port is output to the CPU. A program to control the CPU is written in the ROM in the figure, and according to this program, the CPU imports necessary external data from the input port, or exchanges data with the RAM. It performs arithmetic processing and outputs the processed data as a digital signal to the output port as necessary. The output port that receives the signal converts this signal to D/
After A conversion, the signal is output to the inverter 70. The inverter 70 receiving this signal supplies power at a predetermined frequency to the drive motor 12, thereby causing the drive motor 12 to rotate at a rotational speed corresponding to the frequency.

When the program written in the ROM shown in FIG. 3 is shown in a flowchart, the first invention is as shown in FIGS. 4 and 6, and the second invention is as shown in the fourth invention.
The result will be as shown in Fig. and Fig. 8. Below, with reference to FIGS. 4 to 9, the control operations of the respective operation control devices of the first invention and the second invention will be sequentially explained. Here, the meanings of the symbols used in each flowchart are as follows.

W: Initial value 0 or the wind speed level determined in the previous measurement interval, which is used for pressure determination Wa: Measured every second at each wind speed level measured this time.

(Each W and Wa are values obtained by converting the actual wind speed to a level according to the table in Figure 5.) WaMAX: Maximum value P among local maximum values within the current measurement section; Pressure difference level (air tent The actual pressure difference between the inside and outside is converted to a level according to the table in Figure 5, and it is determined that the optimum state is when W and P are equal.) N: Value that specifies the number of measurements. (In this example, it was measured every second, and the maximum value was measured 600 times, that is, for 10 minutes.) WT: The time (seconds) that specifies how much time the blower output is to be reduced. T: Maximum time to maintain the blower output in a constant state when there is snow (18 hours) ●About the first invention When the program starts after initial settings are made, the flowchart shown in Figure 4 is followed. A determination of the maximum wind speed level is made. That is, the wind speed level for one second is first selected based on the signal from the wind speed detection means 20. This wind speed level is determined according to the table shown in Figure 5, and the determined value is
It is said to be Wa. (Step) This value Wa is 0 (if it has been reset) or the maximum value W for the previous maximum 10 minutes (if measurements have been made continuously)
It is determined in step whether it is greater than or not. If Wa is larger than W, this Wa is stored as W (step), the number of measurements N is set to 0 (that is, measurement for a maximum of 10 minutes is started) (step), and WaMAX is set to 0 (step). step). Therefore, in this case, Wa is output as the wind speed level value W. After that, the process reaches the step shown in FIG.

On the other hand, if Wa is not larger than W,
This Wa is compared with WaMAX, which is the maximum value of the wind speed level within the current measurement section (step), and if Wa is larger than WaMAX, this value is
Wa is stored as WaMAX (step).
Then, this measurement is performed sequentially for 600 times.
The next measurement starts when the
), the current value of WaMAX is stored as the value of W (step), and WaMAX is set to 0 (step). During this time, if Wa is smaller than the previous WaMAX, that Wa is not stored (skip from step). In other words, the maximum Wa remains stored within this measurement interval. Of course, if the number of measurements has not reached 600, steps will be skipped until that number is reached. Therefore, by this operation, the maximum value WaMAX of the previous measurement period is output as the wind speed level W.

In the manner described above, the maximum wind speed level W within the measurement section is determined.

This determination of level W has the following effects. That is, as shown in FIG. 9, if the actual wind speed has been gradually increasing since the start of the measurement, the wind speed level W will also increase to approximately follow this increase.
(See the part indicated by reference numeral 81 in FIG. 9). If the wind speed decreases from this state, the wind speed level W is maintained at the maximum value among the values measured so far, and this state continues. (See reference numeral 82 in Figure 9) and 10
Even if the minute has not passed, the wind speed is at level 8.
When the wind speed exceeds 2, the wind speed level W increases again to follow the increase in wind speed. (See reference numeral 83 in Figure 9) If the wind speed decreases again, the wind speed level W will be maintained at the maximum value among the values measured last time, and if the wind speed does not increase during the 10 minutes, it will remain in that state for 10 minutes. Continue. (See reference numeral 84 in FIG. 9) Then, the maximum value among the local maximum values of wind speed within this measurement section is stored. (The value corresponds to the wind speed indicated by the symbol 86 in Figure 9) Therefore, 10
If the actual wind speed is smaller than the value corresponding to the stored level value in the next measurement section after a minute has elapsed, the value of level W is determined to be the stored wind speed level of the previous measurement section. (See the part indicated by reference numeral 85.) The step in FIG. 6 is where the wind speed level W is determined as described above. next,
Each of the following steps will be explained with reference to FIG.

The wind speed level W and differential pressure P calculated in steps and are compared in the next step. As for the differential pressure P at the step, the actual pressure difference between the inside and outside of the air tent 10 is converted into a predetermined level value according to the table shown in FIG. If it is determined in step that level W is greater than level P, the process proceeds to step. In this step, a signal is selected to increase the output of the blower 11 by one step, and this signal is output from the output port to the inverter 70.

Conversely, if level P is greater than level W, the process proceeds to step. In this step, it is determined whether the time WT (seconds), which defines the time within which the blower output is to be reduced, has become zero. During this time WT is 0
If so, a signal is selected to lower the output of the blower 11 by one step, and this signal is output from the output port to the inverter 70. In the next step, the time WT (seconds) is selected according to the value of the difference between the levels P and W and the rate of change thereof, according to the table shown in FIG. This time WT is determined to be a short time when the difference between the levels P and W is large, and to be a long time when the difference between the levels P and W is small. Then, a countdown starts in step, and it is determined in step whether the difference between levels P and W is increasing. If the difference between levels P and W is increasing, in step a signal is selected to reduce the output of the blower 11 according to the amount of increase, and this signal is output from the output port to the inverter 70. Note that if WT is not 0 at a step, the process skips to the step.

Furthermore, if levels P and W are the same in the step, the process returns to the step.

The process and operation shown in FIG.
From the viewpoint of the operation phenomenon, when the wind around the air tent 10 is large compared to the pressure difference between the inside and outside of the air tent 10, the output of the blower 11 increases rapidly by repeating steps ~. ,
On the other hand, the wind around the air tent 10
If the pressure difference between the inside and outside of the air blower is small compared to the pressure difference between the inside and outside of the air blower, the output of the blower 11 is controlled to be reduced within an appropriate time.

●About the second invention Next, the flow of processing and operations in the second invention will be explained with reference to FIG. The processing and operations in this second invention are basically the same as those in the first invention, so if each step is a step in which the same processing and operation as in the first invention is performed, the steps in FIG. By assigning the same symbol as each step symbol, the explanation thereof will be omitted. This second
The fundamental difference between the invention and the first invention is that
The purpose is to control the blower 11 more precisely by inputting the signal from the snow detection means 40 and taking this signal into consideration.

In the steps of the flowchart in Figure 8,
If the levels P and W are equal, the process proceeds to step, and if the snowfall detecting means 40 detects snowfall, the process proceeds to step. In the step, a signal is selected to increase the output of the blower 11 by one step,
This signal is output to inverter 70 from the output port. This is because if you leave the air tent 10 with snow on it, there is a risk that the air tent 10 will collapse, so even if the air tent 10
This is done to increase the pressure inside the air tent 10 so that it can withstand the weight of snow even if the inside pressure is in a good condition against the outside wind.

Furthermore, if the level P is greater than W in step, the process proceeds to step. If the snowfall detecting means 40 detects snowfall in this step, the process proceeds to step. In this step, a snow flag is set, and in the next step, a signal is selected to increase the output of the blower 11 by one step, and this signal is output from the output port to the inverter 70. And the steps
16, set the value of T to 18×60×60 (seconds) (18 hours). After this, return to the step. Next, if the snow detecting means 40 detects snow when the step is reached again, the process proceeds to step, in which a snow flag is set, and in the next step a signal is selected to further increase the output of the blower 11 by one step. . By repeating this process, if the air tent 10 is inflated by a predetermined amount, the snowfall detecting means 40 will no longer detect snowfall in step, so the process proceeds to step. In the step, it is determined whether or not the snow flag is set; however, in the current situation, the snow flag remains set in the step, so the process proceeds to the step. In the step, 1 is subtracted from the value set in the step, and the process advances to the next step. In this step, it is determined whether T is 0 or not, and if it is not 0, the process proceeds to the step, and if it is 0, the snow flag is lowered in the step. In other words, by this process,
Even if the pressure inside the air tent 10 is in a good condition against the external wind, the pressure inside the air tent 10 is kept high for 18 hours so that it can withstand the weight of snow. The reason why the set value of T is set to 18 hours is that after 18 hours, or about one day, the air tent 10
This is because the snow on top will either melt away or you can remove the snow. When the snow flag falls, the process goes from step to step to step.

(Effects of the Invention) According to the drive control device according to the present invention configured as described above, the following effects can be obtained.

●About the first invention A blower is operated by converting the actual wind speed into a level value within a certain range, adjusting it to this wind speed level, and comparing the maximum wind speed level value within a predetermined measurement interval with the wind speed level within the next measurement interval. Since the drive of 11 is controlled, it is similar to the conventional method that follows changes in wind speed each time.
It is no longer necessary to violently turn on and off the power input to the drive motor 12 of the blower 11 in accordance with changes in wind speed. Therefore, in addition to driving the drive motor 12 to rotate by converting the frequency of the supplied gravity, it is possible to suppress power consumption by the drive motor 12 as much as possible. Further, since there is no need to adjust the amount of air blown using a damper, which was conventionally done, the configuration of this type of air membrane structure can be simplified. Furthermore, although the drive motor 12 is always rotating, the number of rotations is adjusted by changing the frequency of the drive power, and the amount of air blown is thereby adjusted. Noise caused by repeated activation and deactivation is almost eliminated.

More importantly, if the air flow is adjusted according to changes in wind speed as in the past, it will not be possible to deal with gusts of wind, but with the drive control device of the present invention, For example, the pressure inside the air tent 10 can be raised rapidly and the pressure lowered gradually, so even during times of the year when gusts of wind blow frequently, such as during the typhoon season, no human intervention is required. This type of air membrane structure can be automated without the need.

●About the second invention In the second invention, not only can the effects of the first invention be obtained, but also the following effects can be obtained especially in areas with heavy snowfall. That is, by also taking into consideration the signal from the snowfall detection means 40, if there is snowfall, the air tent 10
By increasing the internal pressure, it is possible to prevent the air tent 10 from collapsing due to snow accumulation.

[Brief explanation of drawings]

FIG. 1 is a diagram clearly showing the configuration of the present invention, FIG. 2 is a side view showing an embodiment of the present invention, and FIG. 3 is an overall configuration diagram of a drive control device according to the present invention. Figure 4 is a flowchart showing the maximum wind speed determination routine performed by the microcomputer, Figure 5 is a list for converting actual wind speed values and pressure differences into their respective levels, and Figure 6 is a flowchart showing the maximum wind speed determination routine performed by the microcomputer. The first step to determine the maximum wind speed is
Figure 7 is a flowchart showing the routine of the invention, Figure 7 is a table showing the time to reduce the blower output in response to the difference between the pressure and wind speed levels, and Figure 8 is a flowchart showing the time to reduce the blower output in response to the difference between the pressure and wind speed levels. 12 is a flowchart showing a routine of the second invention. Further, FIG. 9 is a graph clearly showing the correspondence between the actual wind speed and the determined wind speed level. Explanation of symbols, 10...Air tent, 11...Blower, 12...Drive motor, 20...Wind speed detection means, 30...Pressure detection means, 40...Snow detection means, 41...Light emitter, 42... Transmitter/receiver, 50...
... Maximum wind speed value determination means, 60 ... Frequency conversion signal generation means, 70 ... Inverter.

Claims (1)

[Scope of Claims] 1. (a) Wind speed detection means for detecting the wind speed near the air membrane structure; (b) Pressure detection means for detecting the pressure within the air membrane structure; (c) The wind speed detection means. maximum wind speed value determining means for determining a maximum wind speed value based on a signal from the means; (d) comparing and calculating the signal from the maximum wind speed value determining means and the signal from the pressure detecting means to generate a frequency conversion signal; (e) an inverter that converts the frequency of the drive power source in response to the frequency conversion signal; and (f) a blower driven by the drive power source whose frequency has been converted by the signal from the inverter. An air membrane structure drive control device equipped with a drive motor. 2 (a) Wind speed detection means for detecting the wind speed in the vicinity of the air membrane structure; (B) Pressure detection means for detecting the pressure within the air membrane structure; (c) For detecting snow accumulation on the air membrane structure. snow accumulation detection means; (d) maximum wind speed value determination means for determining a maximum wind speed value based on a signal from the wind speed detection means; and (e) a signal from the maximum wind speed value determination means, the pressure detection means, and snow accumulation. (f) an inverter that converts the frequency of the drive power source in response to the frequency conversion signal; (g) a signal from the inverter that converts the frequency of the drive power source; and a drive motor for a blower driven by a converted drive power source.