JPH0248714B2 - KUKIMAKUKOZOBUTSUNOKUDOSEIGYOSHISUTEMU - Google Patents

Description

Detailed Description of the Invention (Field of Industrial Application) The present invention is a drive control system for an air membrane structure, that is, an air dome, which is used as a temporary building, warehouse, workshop, sports facility, etc. installed in various exhibition halls. It is related to.

(Prior art) This type of air membrane structure covers a relatively large space in response to constantly changing weather conditions and covers a long period of time, so the pressure of the air within the air membrane remains constant at all times. It needs to be raised. Therefore, in this type of air membrane structure, air is normally supplied into the air membrane by a main blower, and if this main blower becomes unable to supply air for some reason, An auxiliary blower is driven to keep the pressure within the air film constant.
However, this type of air membrane structure is not only required to maintain a constant pressure within the air membrane, but also requires various other conditions. In other words, it must be fully automated and suitable for long-term operation.It must be able to respond immediately to various abnormal conditions even when unmanned.It must be able to operate for a long period of time, so it must consume as little power as possible. etc.

Conventional air membrane structures cannot be said to fully satisfy the various demands mentioned above.

(Problems to be Solved by the Invention) The present invention has been made in view of the above-mentioned circumstances. To provide an air membrane structure that can immediately respond to any situation and that consumes as little power as possible.

(Means for Solving the Problems) In order to solve the above problems, the means adopted by the present invention are as follows: A main blower that is driven by a drive motor and feeds air into the air membrane structure; An inverter converts the rotation speed by changing the frequency of the electric power supplied to the drive motor of the main blower, and a control signal is sent to the inverter by processing the wind speed outside the air structure and the pressure difference between the inside and outside as data. and an auxiliary blower that is driven by a drive motor or engine to feed air into the air membrane structure, and the auxiliary blower and the main blower are connected to a blower switching device. Additionally, this blower switching device section is provided with an engine start control section that drives the engine of the auxiliary blower in the event of a power outage, and receives an abnormality signal from a blower abnormality detector provided in the main blower, from the inverter and the drive control section. This blower switching device section switches and supplies power to the auxiliary blower when any abnormality occurs in the main blower, the inverter, or the drive control section, and in the event of a power outage. This is a drive control system for an air membrane structure, characterized in that the engine of the auxiliary blower is driven by the blower switching device section.

This means will be specifically explained with reference to FIG. 1 as follows. In other words, the air membrane structure 100
A main blower 110 and an auxiliary blower 140 are connected to each via a supply duct, and the main blower 110 is connected to the drive motor 111, while the auxiliary blower 140 is connected to the drive motor 141 or the engine
42. A chuck damper 112 is provided at the outlet of the main blower 110, and the chuck damper 112 hangs downward when the amount of air blown decreases, and when the chuck damper 112 hangs downward, an abnormality signal is generated. In addition, each drive motor 11 of the main blower 110 and the auxiliary blower 140
1 and the drive motor 141, the blower switching device section 1
It is connected so that power is supplied from 51,
In particular, the drive motor 111 and the blower switching device section 151
An inverter 120 is interposed between them.

The inverter 120 converts the frequency of the electric power supplied to the drive motor 111, and the frequency is determined by a signal from a drive control section 130 connected to the inverter 120. The drive control unit 130 controls the wind speed outside the air membrane structure 100, the pressure grooves inside and outside the air membrane structure 100, and the air membrane structure 1.
00 is used as input data to determine the amount of air blown by the main blower 110, and an output signal obtained by this calculation process is sent to the inverter 120. be.

In addition, the chatter damper 11 of the main blower 110
2. The abnormal signals from the inverter 120 and the drive control unit 130 are configured to be directly output to the blower switching device unit 150, and one of these abnormal signals is output to the blower switching device unit 150. Then, the blower switching device section 150 switches the power supply from the drive motor 111 to the drive motor 141. The blower switching device section 150 is configured to issue an alarm using an alarm connected to it when the drive motor 141 or the engine 142 is activated. Furthermore, this blower switching device section 150 is provided with an engine drive control section 151, and this engine drive control section 151 is configured to issue a drive signal to drive the engine 142 of the auxiliary blower 140 during a power outage. be.

(Function) The drive control system for the air membrane structure 100 configured as described above functions as follows. That is, during normal operation, the drive motor 111 of the main blower 110 is switched from the blower switching device section 150 to the
Power is supplied to the At this time, the frequency of the electric power supplied to the drive motor 111 is selected by the inverter 120 to be suitable for the environment in which the air membrane structure 100 is placed. The selection of the frequency by the inverter 120 is carried out by the drive control unit 130, which processes various conditions.
This is done by a signal from In other words, if the air membrane structure 100 is exposed to strong winds, or if the pressure inside the air membrane structure 100 decreases abnormally due to some reason, or even if the air membrane structure 1
If there is a large amount of snow on the air membrane structure 100, the frequency of the power supplied is increased by the inverter 120 to increase the amount of air supplied into the air membrane structure 100. On the contrary, if the return boundary of the air membrane structure 100 is plain and there is no abnormal condition in the air membrane structure 100, the air membrane structure 100 has enough air to maintain its expanded state. The drive motor 111 is configured to supply a minimum amount of air.
The frequency of the power supplied to the inverter 120 is reduced by the inverter 120.

On the contrary, the main blower 110, the inverter 1
20 or the drive control section 130, an electrical signal indicating this abnormal state is outputted to the blower switching device section 150 through each connection line 112, 121, 131. The blower switching device section 150 that senses this abnormal condition immediately converts the power supply from the drive motor 111 of the main blower 110 to the drive motor 141 of the auxiliary blower 140. As a result, the main blower 110 stops, and the auxiliary blower 140 starts operating in its place. Thereby, the air membrane structure 100 can maintain its normal expanded state without any influence.

Further, if the electric power supplied to the blower switching device section 150 is no longer supplied, the engine drive control section 151 immediately senses this state and issues a signal to drive the engine 142 of the auxiliary blower 140. Therefore, even if a power outage occurs, the air membrane structure 100 can maintain its normal expanded state without any influence.

(Example) Next, specific configurations for controlling the drive of the air membrane structure 100 will be described with reference to FIG. 2 and subsequent figures. In addition, the specific size of the air membrane structure 100 illustrated in this example is 40 m in length;
It is 20 meters wide and 12 meters high, and has a volume of approximately 6,400 cubic meters. Moreover, this air membrane structure 10
0, as shown in FIG.
The current situation can be grasped by the inverter 1, and the inverter 1 receives signals from these.
As shown in FIG. 3, the drive control section 130 that controls the wind speed 20 is comprised of a maximum wind speed value determination means 50 and a frequency conversion signal generation means 60.

The wind speed detection means 20 is disposed outside and near the air membrane structure 100, and is arranged outside the air membrane structure 100.
The system constantly observes the wind speed near the area. The wind speed detection means 20 transmits the observed wind speed as a pulse signal to the maximum wind speed value determination means 50. 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 100 and at the same height as the top of the air membrane structure 100. If it is installed directly on the top of the air membrane structure 100, 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 100, the situation where the air membrane structure 100 is placed can be grasped. This is because it is not suitable for doing so.

On the other hand, the air membrane structure 100 has pressure detection means 3.
0 was placed. This pressure detection means 30 is of a known type, and after constantly observing both the pressure inside the air membrane structure component 100 and the pressure outside thereof and converting the differential pressure between them into an electrical signal, the pressure detection means 30 converts the pressure difference into an electrical signal. 6
0.

The snow detection means 40 detects the air membrane structure 100 by snow accumulating on the air membrane structure 100.
This method utilizes the phenomenon that the ceiling lowers, and detects when the ceiling lowers and transmits it as an air signal to frequency conversion signal generating means 60, which will be described later. Various configurations can be considered for the snow accumulation detection means 40, but in the case of this embodiment, the configuration is as follows. That is, a light receiver 42 that receives light in a certain direction is attached to the ceiling of the air film structure 100, and a light emitter 41 that faces the light receiver 42 when the air film structure 100 is fully expanded.
was installed below the air membrane structure 100. The reason why the light receiver 42 is attached to the ceiling side of the air film structure 100 is to prevent errors caused by sunlight entering the light receiver 42 when the film body composing the air film structure 100 is transparent. This is to prevent activation.
As a result, when the air film structure 100 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. In addition, if snow accumulates on the air membrane structure 100 and the ceiling lowers, the light emitting device 4
The radiation direction of the first light is shifted from the light receiver 42, and the light receiver 42 is no longer able to 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 the electric circuit of the drive control section 130 will be explained with reference to FIG. 4. Electrical signals from the wind speed detection means 20, the pressure detection means 30, or the snow detection means 40 are outputted to the input port. These wind speed detection means 20, pressure detection means 30, and snow accumulation detection means 40 convert their respective states into digital signals and constantly output them 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 passes this signal to the inverter 12.
After converting 0/air membrane structure 100, it is output to the inverter 120. Upon receiving this signal, the inverter 120 supplies power at a predetermined frequency to the main blower 110.
is supplied to the drive motor 111, whereby the drive motor 111 rotates at a rotational speed corresponding to the frequency.

If the program written in the ROM shown in FIG. 4 is shown in a flowchart, it will be as shown in FIGS. 5 and 7, or as shown in FIGS. 5 and 9. In the case of Fig. 5 and Fig. 9, the snow detection means 40
In the case of FIG. 5 and FIG. 7, the signal from the snow detection means 40 is not taken into consideration. Below, Figure 5 ~
With reference to FIG. 9, control operations of the drive control section 130 will be sequentially explained. Here, the meanings of the symbols used in each flowchart are as follows.

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 6.) 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 6, and it is determined that the optimum state is achieved 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 at a constant state when there is snow (18 hours) When the program starts after initial settings are made, the maximum wind speed level is determined according to the flowchart shown in Figure 5. It will be done. 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 6, and the determined value is
Wa (step). It is determined in step whether this value W is greater than 0 (if it has been reset) or the maximum value W for the previous maximum of 10 minutes (if measurements have been made continuously). 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 and the number of times is
When it reaches 600, the next measurement starts (step,
, ), 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. 10, if the actual wind speed increases gradually after the measurement starts, the wind speed level W also increases to approximately follow this increase.
(See the part indicated by reference numeral 81 in Fig. 10.) If the wind speed decreases from this state, the wind speed level W will be maintained at the maximum value among the values measured so far, and this state will continue (Fig. 10). (see reference numeral 82) and
Even before 10 minutes have elapsed, if the wind speed exceeds level 82, the wind speed level W will rise again following this increase in wind speed (see reference numeral 83 in Figure 10). . 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 this state will continue for 10 minutes if the wind speed does not increase within 10 minutes (reference number 8 in Figure 10).
(see 4). Then, the maximum value among the local maximum values of the wind speed within this measurement section is stored (in FIG. 10, this value corresponds to the wind speed indicated by reference numeral 86).
Therefore, if the actual wind speed in the next measurement section after 10 minutes has passed is smaller than the value corresponding to the memorized level value, the value of level W is determined to be the memorized wind speed level of the previous measurement section. (See the part indicated by reference numeral 85 in FIG. 10).

The step in FIG. 7 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 the differential pressure P at the step, the actual pressure difference between the inside and outside of the air membrane structure 100 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 the step,
A signal is selected to increase the output of the main blower 110 by one step, and this signal is output from the output port to the inverter 120.

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 main blower 110 by one step, and this signal is output from the output port to the inverter 120. In the next step, according to the table shown in Figure 8, the time WT (seconds) corresponding to the value of the difference between the levels P and W and its rate of change
is selected. This time WT is short when the difference between levels P and W is large;
If the difference is small, it is decided to take a long time. 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 main blower 110 according to the amount of increase, and this signal is output from the output port to inverter 120. 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 of 0, when the wind around the air structure 100 is large compared to the pressure difference between the inside and outside of the air membrane structure 100, the main blower 110 is If the wind around the air membrane structure 100 is small compared to the pressure difference between the inside and outside of the air membrane structure 100, the output of the main blower 110 will decrease within a suitable time. It is controlled as follows.

Next, with reference to FIG. 9, the flow of processing and operations when the signal from the snow detection means 40 is also input to the drive control section 130 will be described. In this case, the basic difference from the above-described one is that the signal from the snow detection means 40 is input, and by taking this signal into consideration, the main blower 110 is controlled more precisely. In addition, in this explanation, if each step is the same as that shown in Fig. 7, the same symbol as that shown in Fig. 7 will be given in Fig. 9 to indicate that step. The explanation will be omitted.

In the steps of the flowchart in Figure 9,
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 this step, a signal is selected to increase the output of the main blower 110 by one step, and this signal is output from the output port to the inverter 120. This is because if the air membrane structure 100 is left alone with snow on it, there is a risk that the air membrane structure 100 will collapse, so even if the pressure inside the air membrane structure 100 is not good against the external wind. This is done to increase the internal pressure so that it can withstand the weight of snow even when the snow is wet.

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 main blower 110 by one step, and this signal is output from the output port to the inverter 120. Then, in step, the value of T is set to 18×60×60 (seconds). 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, and in this step, the snow flag is set and
In the next step, a signal is selected to further increase the output of the main blower 110 by one step. By repeating this process, if the air membrane structure 100 expands by a predetermined amount, the snowfall detecting means 40 will no longer detect snowfall in step, so the process will proceed to step.
In the step, it is determined whether or not the snow flag is up, but in the current situation, the snow flag has been left up 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 or not T is 0. If T 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,
Through this process, even if the pressure inside the air membrane structure 100 is in a good condition against external wind,
The pressure inside the air membrane structure 100 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 because the snow on the air membrane structure 100 will melt or disappear after 18 hours, or about one day, or snow removal work can be performed. When the snow flag falls, the process goes from step to step to step.

(Effects of the Invention) As detailed above, according to the drive control system according to the present invention, the main blower 110 normally operates, and when there is an abnormality in the main blower 110, the inverter 120, or the drive control section 130, The auxiliary blower 140 is immediately driven. Further, even in the event of a power outage, the engine 142 is immediately driven, and the air membrane structure 100 maintains its normally expanded state.
Therefore, the air membrane structure 100 is driven completely automatically, which eliminates the need for personnel who would otherwise be required to maintain the air membrane structure 100. It is possible to significantly reduce costs. In addition, under normal conditions, the inverter 120 controls the drive motor 111 of the main blower 110 in response to a signal from the drive control unit 130.
Because it is driven by the minimum amount of electric power,
The power consumed by the system as a whole is kept to a minimum.

[Brief explanation of drawings]

Fig. 1 is a schematic configuration diagram showing a drive control system according to the present invention, Fig. 2 is a side view of the same, and Fig. 3 is an overall diagram schematically showing the relationship among the air membrane structure, main blower, inverter, and drive control section. The configuration diagram, FIG. 4, is a schematic configuration diagram of the drive control section. Figure 5 is a flowchart showing the maximum wind speed determination routine performed in the drive control section, Figure 6 is a list for converting actual wind speed values and pressure differences into their respective levels, and Figure 7 is a flowchart showing the maximum wind speed determination routine performed in the drive control section. A flowchart showing the routine for determining the maximum wind speed carried out in the control unit, Fig. 8 is a list showing the time to reduce the blower output in response to the difference between the pressure and wind speed levels, and Fig. 9 shows snow detection. 12 is a flowchart showing a routine for determining the maximum wind speed performed by the drive control unit in consideration of signals from the means. Moreover, FIG. 10 is a graph clearly showing the correspondence between the actual wind speed and the determined wind speed level. Explanation of symbols, 100...Air membrane structure, 110
...Main blower, 111...Drive motor, 120...
...Inverter, 130... Drive control section, 140...
...Auxiliary blower, 141... Drive motor, 142...
...Engine, 150...Blower switching device section, 15
DESCRIPTION OF SYMBOLS 1... Engine start control part, 20... Wind speed detection means, 30... Pressure detection means, 40... Snow accumulation detection means, 41... Light emitter, 42... Light transmitter/receiver, 50...
... Maximum wind speed value determination means, 60... Frequency conversion signal generation means.

Claims (1)

[Claims] 1. A main blower that is driven by a drive motor and feeds air into the air membrane structure; an inverter that converts the rotation speed by changing the frequency of the electric power supplied to the drive motor of the main blower; a drive control unit that processes the wind speed outside the air membrane structure and the pressure difference between the inside and outside as data and issues a control signal to the inverter; and a drive control unit that is driven by a drive motor or engine to supply air into the air membrane structure. an auxiliary blower for blowing air, the auxiliary blower and the main blower are connected to a blower switching device section, and the blower switching device section is provided with an engine start control section that drives the engine of the auxiliary blower during a power outage; Further, an abnormality signal from a blower abnormality detector provided in the main blower, an abnormality signal from the inverter and the drive control section can be inputted, and the blower switching device section switches between the main blower, the inverter, or the drive control section. An air membrane characterized in that when some abnormality occurs in the drive control section, power is switched and supplied to the auxiliary blower, and in the event of a power outage, the blower switching device section drives the engine of the auxiliary blower. Structure drive control system.