JP4586095B2 - Liquid level control system - Google Patents

Description

  The present invention relates to a liquid level control system, and more particularly to a liquid level control system for controlling the liquid level of a liquid tank.

  In the conventional water supply system, a plurality of electrode rods are used as a mechanism for detecting various water levels in order to control the water level of the water receiving tank. However, the set water level by the electrode rod is fixed, and once the water level is set, it cannot be changed and is inconvenient. For this reason, what can detect a water level continuously with an ultrasonic wave, water pressure, etc. is proposed (for example, patent documents 1).

  FIG. 22 is a diagram showing the concept of calibration of a water level meter that detects the water level by the water pressure in a conventional water tank. A broken line y indicates a direct output value from the water level gauge, and a solid line x is a design value (theoretical value) indicating a relationship between the water level and the output value of the water level gauge.

  Referring to the figure, the broken line y obtained by the direct output value from the water level gauge does not accurately indicate the water level in the water receiving tank, and is deviated from the solid line x which is the design value. Calibration is performed in order to eliminate this deviation, and the direct output value from the water level meter is made the same as the design value, and accurate water level control is performed. Specifically, calibration is performed by zero adjustment for adjusting the left end point in the graph of the broken line y and span adjustment for adjusting the inclination in the graph of the broken line y and the solid line x.

  FIG. 23 is a schematic configuration diagram of the water tank apparatus disclosed in Patent Document 2.

  Referring to the figure, water supply systems 2a and 2b are connected to A tank 1a and B tank 1b, which are water receiving tanks, respectively. The water supply systems 2a and 2b are respectively provided with constant water level valves 3a and 3b with built-in solenoid valves. The water level signals 3a and 28b from the CPU 73 are opened and closed to open and close the tank A 1a. And the water supply in B tank 1b is controlled, and the water level of A tank 1a and B tank 1b is maintained in a predetermined range.

  Moreover, the pumping pump 22 is provided in the bottom part of the A tank 1a and the B tank 1b as a discharge system which discharges water, and the water of the A tank 1a and the B tank 1b is normally connected in the state which connected. 22 is sent to an elevated water tank (not shown).

  Furthermore, the A tank 1a and the B tank 1b are provided with water level detectors 25a and 25b, respectively. The water level detectors 25a and 25b output a continuous water level A signal 27a and a water level B signal 27b corresponding to the water level due to the water pressure.

  The water level A signal 27a and the water level B signal 27b are sent to the calibration circuits 21a and 21b, respectively, and are adjusted by zero adjustment and span adjustment. Therefore, even when there is a difference in the characteristics of the water level detectors 25a and 25b, the water level signals from the water level detectors 25a and 25b are set equal over the entire measurement range by adjusting the calibration circuits 21a and 21b first. It becomes possible.

The water level signals calibrated by the calibration circuits 21a and 21b are each sent to the A / D converter 72, converted into digital signals, sent to the CPU 73, and a plurality of water level settings set in advance by the CPU 73. Compares the value with the water level signal and sends various control signals, for example, water supply signals 28a and 28b to the constant water level valves 3a and 3b to control opening and closing, and outputs a full water alarm, low water alarm, idling alarm, return signal, etc. The water level of tank A 1a and tank B 1b is controlled.
In a water tank apparatus having a plurality of water receiving tanks and normally connected to each other, one main detector is set from the water level detectors provided in each water tank, and the water level control of the plurality of water receiving tanks is performed. In such a case, for example, if there is an error in the output value between the detectors due to the switching of the main detector when cleaning each receiving tank, the water level will fluctuate significantly, resulting in an abnormal drop in water level or reception. Since there is a danger of overflow from the water tank, a calibration circuit is particularly required when a plurality of water receiving tanks are provided.

Japanese Patent No. 2832183 JP 2003-342980 A

  In the conventional liquid level control system as described above, calibration by zero point adjustment and span adjustment is performed at the start of use of the water level detector and when a deviation from the design value occurs due to aging of the water level detector after calibration. It is necessary and time-consuming.

  The present invention has been made to solve the above-described problems, and provides a liquid level control system that can easily adjust the output value of the water level detector and can control the liquid level with high accuracy. The purpose is to do.

  In order to achieve the above object, the invention according to claim 1 is a liquid level control system for controlling the liquid level of the liquid tank, and is installed corresponding to the liquid tank, and has a horizontal sectional area of the liquid tank. A transparent auxiliary liquid tank that has a smaller horizontal cross-sectional area, and the liquid level fluctuation range of the liquid that can be held overlaps only part of the liquid level fluctuation range that the liquid tank can hold, and a liquid tank And a detecting means connected to the auxiliary liquid tank so as to be switchable and capable of detecting a corresponding value based on the liquid pressure for any liquid level of the liquid tank and the auxiliary liquid tank, and connecting the detecting means to the auxiliary liquid. Switching to the tank, storage means for storing the liquid ratio with respect to each reference liquid level at any two different liquid levels in the auxiliary liquid tank, and the two detection values of the corresponding detection means, and connection of the detection means Switch to a liquid tank and remember Based on the specific detection value of the detecting means corresponding to the control liquid level to be controlled in the liquid tank, the liquid at the control liquid level is determined based on the correlation between the two liquid ratios and the liquid ratio determined by the detection value and the detection value. And a discriminating means for discriminating the ratio.

  According to this configuration, the liquid ratio of the control liquid level is determined based on the specific detection value corresponding to the control liquid level, and even if the liquid is not injected into the liquid tank, the fluctuation level of the liquid level of the liquid tank is reduced. The control of the liquid tank can be set only by injecting the liquid into the transparent auxiliary liquid tank that overlaps only the part.

  The invention according to claim 2 is a liquid level control system for controlling the liquid level of the liquid tank, is installed corresponding to the liquid tank, has a horizontal cross-sectional area smaller than the horizontal cross-sectional area of the liquid tank, The liquid level fluctuation range of the liquid that can be held is connected to the transparent auxiliary liquid tank that overlaps only part of the liquid level fluctuation range that the liquid tank can hold, and the liquid tank and auxiliary liquid tank can be switched freely. The detection means capable of detecting the corresponding value based on the liquid pressure for any liquid level of the liquid tank and the auxiliary liquid tank, and switching the connection of the detection means to the auxiliary liquid tank, Two different liquid levels and detection values are stored by storing storage means for storing two different arbitrary liquid levels and two detection values of the detection means corresponding thereto, and switching the connection of the detection means to the liquid tank. The correlation between the liquid level determined by I, based on the specific detection value of the detection means corresponding to the control liquid level to be controlled liquid bath, in which a discriminating means for discriminating the level of the control liquid level.

  With this configuration, the liquid level of the control liquid level is determined based on the specific detection value corresponding to the control liquid level, and the fluctuation level of the liquid level of the liquid tank can be reduced without injecting the liquid into the liquid tank. The control of the liquid tank can be set only by injecting the liquid into the transparent auxiliary liquid tank that overlaps only the part.

  According to a third aspect of the present invention, in the configuration of the first or second aspect of the present invention, the detection means is connected to the bottom of the liquid tank and the auxiliary liquid tank, and the hydraulic pressure by the liquid held in each tank The corresponding value is detected based on the above.

  If comprised in this way, even if the horizontal cross-sectional area of an auxiliary | assistant liquid tank is small, the same value as a liquid tank is detectable.

  As described above, according to the first aspect of the invention, since the liquid ratio of the control liquid level is determined based on the specific detection value corresponding to the control liquid level, adjustment due to the error of the detection means and span adjustment are required. Therefore, it is possible to control the liquid level with high accuracy. Further, even if the liquid is not injected into the liquid tank, the control of the liquid tank can be set only by injecting the liquid into the transparent auxiliary liquid tank that overlaps only a part of the fluctuation range of the liquid level of the liquid tank. Therefore, the amount of liquid required for adjustment can be further reduced, the level of the auxiliary liquid tank can be easily confirmed, and the system can be adjusted elastically and efficiently.

  According to the second aspect of the present invention, since the liquid level of the control liquid level is determined based on the specific detection value corresponding to the control liquid level, it is highly accurate without requiring adjustment due to an error of the detection means or span adjustment. The liquid level can be controlled. Further, even if the liquid is not injected into the liquid tank, the control of the liquid tank can be set only by injecting the liquid into the transparent auxiliary liquid tank that overlaps only a part of the fluctuation range of the liquid level of the liquid tank. Therefore, the amount of liquid required for adjustment can be further reduced, the level of the auxiliary liquid tank can be easily confirmed, and the system can be adjusted elastically and efficiently.

  In addition to the effect of the invention according to claim 1 or 2, the invention according to claim 3 can detect the same value as the liquid tank even if the auxiliary liquid tank has a small horizontal cross-sectional area. Since it is sufficient to inject a liquid into a small auxiliary liquid tank, the setting of the storage means becomes easy.

1 is a schematic configuration diagram of a liquid level control system according to a first embodiment of the present invention. It is a figure which shows the concept of the liquid level control in the liquid level control system shown in FIG. It is a graph which shows the concept of the liquid level control shown in FIG. It is a figure which shows the setting water level in the liquid level control system shown in FIG. It is a figure which shows schematic structure of the control panel in the liquid level control system shown in FIG. It is a schematic block diagram of the liquid level control system by 2nd Embodiment of this invention. It is a schematic block diagram of the liquid level control system by 3rd Embodiment of this invention. It is a schematic block diagram of the liquid level control system by 4th Embodiment of this invention. It is a schematic block diagram of the liquid level control system by 5th Embodiment of this invention. It is a schematic block diagram of the liquid level control system by 6th Embodiment of this invention. It is a graph which shows the concept of correction | amendment of the detection means in the liquid level control system shown in FIG. It is a schematic block diagram of the liquid level control system by 7th Embodiment of this invention. It is a graph which shows the concept of correction | amendment of the detection means in the liquid level control system shown in FIG. It is a figure which shows the procedure of the initial setting of the liquid level control system shown in FIG. It is a figure which shows the initial setting screen in the touch panel of the control panel shown in FIG. It is a figure which shows the example of a procedure of the setting in the liquid level control system shown in FIG. It is a figure which shows the actual water level setting screen in the touch panel of the control panel shown in FIG. It is a figure which shows the bottom area setting screen in the touch panel of the control panel shown in FIG. It is a figure which shows the setting water level screen in the touch panel of the control panel shown in FIG. It is a figure which shows the example of a procedure of the normal driving | operation in the liquid level control system shown in FIG. It is a figure which shows the period timer setting screen in the touch panel of the control panel shown in FIG. It is a figure which shows the concept of the calibration of the water level meter which detects a water level with the water pressure in the conventional water tank. It is a schematic block diagram of the conventional water tank apparatus.

  FIG. 1 is a schematic configuration diagram of a liquid level control system according to a first embodiment of the present invention.

  Referring to the drawing, a liquid level control system 20 includes a water tank 1, a water supply system 2 connected to the water tank 1, a constant water level valve 3 that includes an electromagnetic valve 4 and adjusts the amount of water supplied from the water supply system 2, A ball tap 5 connected to the valve 4, a water level detector 9 for detecting the water level in the water tank 1 by ultrasonic waves, water pumps 7a and 7b for feeding water in the water tank 1 to, for example, an elevated water tank, and a water pump It is comprised from the water supply system 8 sent by 7a, 7b, the emergency shut-off valve 6 provided in the piping by the side of the water supply of the water tank 1, and the control panel 10 which controls each component apparatus.

  The emergency shut-off valve 6 provided on the water supply side piping of the water tank 1 is emergency shut off by a signal from a seismic device (not shown) linked to the control panel 10 according to the acceleration (Gal) at the time of the earthquake occurrence. Since the valve 6 is controlled to close, water in the water tank 1 can be secured.

  The control panel 10 compares and discriminates a detection value from the water level detector 9 and a set water level, which will be described later, and controls the operation of the electromagnetic valve 4 and the water pumps 7a and 7b. The water level is controlled within a predetermined range. Details of the water level control by the control panel 10 will be described later.

  2 is a diagram showing the concept of liquid level control in the liquid level control system shown in FIG. 1, and FIG. 3 is a graph showing the concept of liquid level control shown in FIG.

With reference to these drawings, in the liquid level control system, first, two different liquid levels A and H are determined in the water tank 1. The water level detector 9 measures the distance L to the water surface by ultrasonic waves. The distances L at the liquid levels A and H are L ₁ and L ₂ , respectively. The water level detector at the liquid levels A and H The detected values X from 9 are X ₁ and X ₂ , respectively. The liquid ratios corresponding to the reference liquid levels at the liquid levels A and H are x% and y%. X ₁ , X ₂ and x%, y% corresponding to these liquid levels A and H are stored by a storage means to be described later in the control panel. By storing X ₁ , X ₂ and x%, y% corresponding to the liquid levels A and H, a straight line representing the correlation between the detected value X and the distance L (liquid ratio) is obtained as shown in FIG. Determined.

Then, the distance from the water level detector 9 to the water surface will be described the control level I to be controlled is L _3. Identification that is a detection value from the water level detector 9 corresponding to the control water level I based on the correlation between the detection values X ₁ and X ₂ determined from the liquid levels A and H shown in FIG. it liquid ratio corresponding to the detected value X ₃ is z% is determined by the determination means to be described later in the control panel.

  As described above, in the liquid level control system 20 shown in FIG. 1, the design value of the detection value X of the water level detector 9 is determined in order to determine the control water level I to be controlled in the water tank 1 based on the liquid ratio based on the reference liquid level. Therefore, it is possible to control the water level with high accuracy without the need for adjustment due to errors and span adjustment.

It should be noted that detection values X corresponding to various liquid ratios are calculated in advance from the straight lines representing the above correlation, and these detection values and actual identification from the water level detector 9 corresponding to the control water level I are specified. by comparing the detected value X ₃ may be directly judged by discrimination means, which will be described below liquid ratio.

  FIG. 4 is a diagram showing a set water level in the liquid level control system shown in FIG.

  Referring to the figure, first, a lower limit water level A (0%) and an upper limit water level H (100%) are set. By setting the lower limit water level A and the upper limit water level H, the lower limit water level becomes a reference liquid level having a liquid ratio of 0% and the upper limit water level becomes 100%. Accordingly, the difference between the two liquid levels stored in the storage means described later is maximized, and the error in the liquid ratio corresponding to the reference liquid level, that is, the error in the slope of the straight line shown in FIG. The discrimination accuracy of the discriminating means, which will be described later, in the control panel is improved.

  The set water levels B to G between the lower limit water level A and the upper limit water level H indicate the water levels set in order to control the water level of the water tank 1, B is the water pump stop water level, and C is the water reduction warning water level. , D is the water pump return water level, E is the water supply start water level, F is the water supply stop water level, and G is the full water warning water level. Each of the set water levels B to G is stored in a storage unit to be described later as a predetermined value based on the liquid ratio. Further, the set water levels B to G are set as one group, and three combination patterns of the standard water level K, the intermediate water level L, and the low water level M are also stored as default values in the storage means described later. Therefore, it becomes easy to set a combination pattern of liquid ratios used for water level control, and usability is improved.

  The following table shows an example in which the set water levels B to G are set at the liquid ratio.

FIG. 5 is a diagram showing a schematic configuration of a control panel in the liquid level control system shown in FIG.
Referring to the figure, each detection value from the water level detector 9 for the lower limit water level and the upper limit water level is sent to the detection means 41, converted into a digital signal, and stored in the storage means 42. In addition, the three combinations of the standard water level K, the intermediate water level L, and the low water level M, in which the set water levels B to G described above and the set water levels B to G described above are made into one group, are liquid ratios as default values. Stored in the storage means 42. The liquid ratios of these set water levels B to G and the combination patterns K to M can be changed by the setting means 45, and the changed liquid ratios are stored again in the storage means 42.

  And the specific detection value from the water level detector 9 corresponding to the control water level to be controlled in the water tank 1 is sent to the detection means 41, stored in the storage means 42, then sent to the calculation means 43, and the lower limit water level. And the liquid ratio based on the reference liquid level corresponding to the correlation between the water level and the upper limit water level. The liquid ratio corresponding to the calculated specific detection value is compared and discriminated based on each set water level and the water level control algorithm by the discriminating means 44, and after passing through the setting means 45 from the control means 46 to the electromagnetic valve 4 and the water pump 7. A control signal is sent to each component device to control the storage and supply of water in the water tank 1.

  Further, the lower limit water level and the upper limit water level are, for example, that a predetermined period elapses after the initial setting, and a deviation occurs between the liquid ratio stored in the storage means 42 and the corresponding detection values from the water level detector 9. When there is a discrepancy with the initial setting, each detection value from the new water level detector 9 corresponding to the lower limit water level and the upper limit water level can be stored again and updated. Therefore, regardless of the change in the detection accuracy of the water level detector 9, highly accurate control of the water level can always be maintained.

  FIG. 6 is a schematic configuration diagram of a liquid level control system according to the second embodiment of the present invention.

  Since the description is basically the same as that according to the first embodiment, the difference will be mainly described.

  Referring to the figure, in this embodiment, the shape of water tank 1 is greatly different. That is, the case where the tall water tank 1 is provided and the water level is controlled only in a limited small range 31 at the top of the water tank 1 will be described.

  Usually, the lower limit water level A1 is set near the bottom of the aquarium 1, and the upper limit water level H is set at the upper part of the aquarium 1. Therefore, when it is desired to control the water level only in the limited upper range 31 of the aquarium 1, the lower limit water level A1 Since the range with the upper limit water level H becomes wider with respect to the small range 31, it is difficult to perform water level control that is fine and accurate with respect to the small range 31.

  In such a case, in the liquid level control system 20 according to this embodiment, the lower limit water level A and the upper limit water level H are set by setting the lower limit water level A and the upper limit water level H of the small range 31 that is the range to be controlled. It becomes possible to perform highly accurate water level control by the set water level set as the liquid ratio.

  Of course, if the lower limit water level A1 is set near the bottom of the water tank 1 and the upper limit water level H is set at the upper part of the water tank 1, the water level from the bottom to the upper part of the water tank 1 can be controlled.

  As described above, the water level can be automatically controlled by setting and storing various setting patterns in advance and selecting the setting pattern according to the conditions.

  FIG. 7 is a schematic configuration diagram of a liquid level control system according to a third embodiment of the present invention.

  Since the description is basically the same as that according to the first embodiment, the difference will be mainly described.

  Referring to the drawing, in this embodiment, first, the number of water tanks is different. That is, two water tanks 1a and 1b are provided. The water tanks 1a and 1b are communicated with each other via a communication pipe 11 at the bottom thereof, and are usually always in a state of communication. The constant water level valves 3a and 3b, the electromagnetic valves 4a and 4b, the ball taps 5a and 5b, the water pumps 7a to 7d, and the water level detectors 9a and 9b are provided in the water tanks 1a and 1b, respectively.

  For each of the above components, the control panel 10 is not provided in each of the water tanks 1a and 1b, and is used in common. In the liquid level control system 20 according to this embodiment, when the water level detector 9a is used as the main detector, water is supplied to the water tank 1a from the water supply system 2a and the water supply stop water level shown in FIG. 4 is reached. When the water level in the water tank 1a rises, the electromagnetic valve 4a is closed by the detection value from the water level detector 9a, the constant water level valve 3a is closed, and the supply of water is stopped. The main detector is set to automatically switch to the water level detector 9b of the water tank 1b with the closing of the electromagnetic valve 4a. Similarly, the main detector is set to be switched to the water level detector 9a of the water tank 1a with the closing of the electromagnetic valve 4b. However, when the cross-sectional area of the communication pipe 11 is smaller than the horizontal cross-sectional areas of the water tank 1a and the water tank 1b, it takes time for the liquid levels of the water tank 1a and the water tank 1b to reach the same water level. The switching may be performed after a certain period of time has elapsed with a timer after the solenoid valve is closed.

  Since the change speed of the water level of the water tanks 1a and 1b is usually small, the water level control of the water tanks 1a and 1b can be switched to each water tank as the electromagnetic valves 4a and 4b are opened and closed. Therefore, since the control device in the control panel 10 is one and the water level control of the water tanks 1a and 1b is possible, the control panel 10 becomes compact. Also, it can be manufactured at low cost.

  FIG. 8 is a schematic configuration diagram of a liquid level control system according to a fourth embodiment of the present invention.

  Note that the description is basically the same as that according to the third embodiment, and thus the difference will be mainly described.

  Referring to the figure, in this embodiment, the number of water tanks is two, but the volume amounts of water tanks 1a and 1b are different. That is, the two water tanks 1a and 1b are different in height. Therefore, the water tanks 1a and 1b are not communicated with each other at the bottom, and are in an independent state.

  In such a case, the control panel 10 stores the lower limit water level A1 and the upper limit water level H1 in the water tank 1a and the lower limit water level A2 and the upper limit water level H2 in the water tank 1b. Then, when the water level detector 9a of the water tank 1a is used as the main detector, the water level control of the water tank 1a can be performed at the set water level set by the liquid ratio with reference to the lower limit water level A1 and the upper limit water level H1 of the water tank 1a. it can. Moreover, when the water level detector 9b of the water tank 1b is used as the main detector, the water level control of the water tank 1b can be performed at the set water level set by the liquid ratio with reference to the lower limit water level A2 and the upper limit water level H2 of the water tank 1b. it can.

  Moreover, the switching method of the main detectors of the water level detectors 9a and 9b is set to be switched alternately at a predetermined interval, for example. Accordingly, even when the two tanks 1a and 1b are different in height, the control level in the control panel 10 is one because the water level is controlled at the set water level corresponding to each of the tanks. Thus, since the water level control of the water tanks 1a and 1b is possible, the control panel 10 can be manufactured at low cost. Moreover, since it is not necessary to modify the water tanks 1a and 1b, the facility cost can be reduced.

  In each of the above embodiments, the water level of the water tank is controlled. However, the present invention can be similarly applied to a device for controlling the liquid level of other liquids other than water.

  Further, in each of the above embodiments, the water level detector detects the water level in the water tank by ultrasonic waves. However, the water level detector can be continuously detected, for example, provided at the bottom of the water tank. Any device that detects the water level may be used.

  Furthermore, in each of the above-described embodiments, the upper limit water level and the lower limit water level are stored by the storage unit, but two different water levels may be used.

  Furthermore, in each of the above embodiments, the water tank has a constant cross section, but may be a water tank that does not have a constant cross section.

  Further, in each of the above embodiments, a plurality of liquid ratios are set as the set water level, but the set water level may not be set.

  Furthermore, in each of the above-described embodiments, the combination patterns of three set water levels are stored, but it is only necessary to store a plurality of combination patterns of set water levels. Alternatively, it may not be stored.

  Further, in each of the above-described embodiments, there is provided storage means that can newly store detection values from the detection means corresponding to the upper limit water level and the lower limit water level, but storage that cannot be updated. Means may be provided.

  Further, in each of the above embodiments, the liquid ratio corresponding to the reference liquid level with respect to the upper limit water level and the lower limit water level is stored, but the liquid level between the upper limit water level and the lower limit water level is directly stored and controlled. The liquid level may be determined as the actual liquid level.

  FIG. 9 is a schematic configuration diagram of a liquid level control system according to a fifth embodiment of the present invention.

  Since the description is basically the same as that according to the first embodiment, the difference will be mainly described.

  Referring to the figure, in this embodiment, first, the detection method of water level detector 9 is greatly different. That is, it does not detect the water level in the water tank 1 by ultrasonic waves, but is connected to the bottom of the water tank 1 via the gate valve 36 and detects the water level based on the magnitude of the water pressure by the water in the water tank 1. .

  Moreover, it has a horizontal cross-sectional area smaller than the horizontal cross-sectional area of the water tank 1 and is formed to be substantially the same height as the water tank 1 and is installed in parallel with the water tank 1, for example, from a transparent glass tube or vinyl tube An auxiliary water tank 15 which is an auxiliary liquid tank is provided. The auxiliary water tank 15 is connected to the water level detector 9 via the gate valve 37. That is, the water level detector 9 is connected to the water tank 1 and the auxiliary water tank 15 via the gate valve 36 and the gate valve 37. Therefore, the water level detector 9 can be switched between the water tank 1 and the auxiliary water tank 15 by opening and closing the gate valves 36 and 37. That is, the water level detector 9 can detect the corresponding value for any water level in the water tank 1 and the auxiliary water tank 15. An auxiliary water supply system 35 is connected to the water tank 1 and the auxiliary water tank 15 via a gate valve 38.

  Here, the setting of the water level control of the liquid level control system 20 in this embodiment will be described.

As shown in FIGS. 2 and 3, in the liquid level control system of the first embodiment, the liquid ratio x%, y% at the reference liquid level of the lower limit water level A and the upper limit water level H in the water tank 1, The detection values X ₁ and X ₂ from the water level detector corresponding to the lower limit water level A and the upper limit water level H are stored in the storage means of the control panel 10.

  However, depending on the conditions at the site where the liquid level control system 20 is installed, water may not be poured into the water tank 1 due to various reasons such as construction process, water supply piping work, facility related work, and completion inspection of the water tank 1. In addition, for example, if the water tank 1 is large, it takes a lot of time to pour water, and when the water tank 1 is inspected for leakage, it may not be possible to drain the water tank 1 while the water tank 1 is full. In such a case, in the liquid level control system 20 according to this embodiment, the auxiliary water tank 15 is used to perform storage in the storage means described above.

  First, the gate valve 36 is closed and the gate valve 37 is opened so that the water level detector 9 detects the liquid level in the auxiliary water tank 15. Then, the gate valve 38 is opened, and the auxiliary water supply system 35 pours the auxiliary water tank 15 to the same water level as the lower limit water level A and the upper limit water level H of the water tank 1. Then, the liquid ratio at these reference liquid levels and the detection values from the water level detector 9 corresponding to the lower limit water level A and the upper limit water level H are stored in the storage means of the control panel 10. When the water level in the water tank 1 is actually controlled, the gate valves 37 and 38 are closed and the gate valve 36 is opened so that the water level detector 9 detects the liquid pressure at the liquid level in the water tank 1. . Then, based on the liquid ratio memorize | stored by the auxiliary | assistant water tank 15, and the detected value, the control water level in the water tank 1 is discriminate | determined with a liquid ratio, and is controlled.

  Therefore, in the liquid level control system 20, it is possible to set control (store the liquid ratio and the detected value) for the water tank 1 without pouring the water tank 1. For this reason, for example, even when the water tank 1 is in a full state and a water leakage test is performed, it is possible to set the control for the water tank 1, and it is not affected by the convenience of other construction or inspection. Construction is possible. Further, since the auxiliary water tank 15 is formed so as to have a much smaller horizontal cross-sectional area than the water tank 1, the water injection and drainage time is shortened compared to the water tank 1. That is, the liquid level control system 20 can be adjusted elastically and efficiently.

  Moreover, since the water level detector 9 detects the water level of the water tank 1 by the water pressure, even if the horizontal sectional area of the auxiliary water tank 15 is small, the same value can be detected if the water level is the same as that of the water tank 1. It becomes. Accordingly, it is only necessary to inject water into the auxiliary water tank 15 having a small horizontal cross-sectional area such as the glass tube shown in the figure, so that the setting of the storage means becomes easy.

  If the auxiliary water tank 15 is used, it can be used not only in the field, but also in the prior setting of the liquid level control system 20 in a factory before shipment. Therefore, the setting and adjustment period after installation of the liquid level control system 20 on site can be shortened, and the reliability of the system is improved.

  FIG. 10 is a schematic configuration diagram of a liquid level control system according to a sixth embodiment of the present invention.

  Note that the description is basically the same as that according to the third embodiment, and thus the difference will be mainly described.

  Referring to the figure, in this embodiment, first, the detection method of water level detector 9 is different. That is, the water level detector 9a serving as the first detection means is connected to the bottom of the water tank 1a serving as the first liquid tank, and detects a corresponding value based on the water pressure by the water held in the water tank 1a. , Which is similar to the water level detector 9 shown in FIG. The water level detector 9b as the second detection means is also the same as the water level detector 9a and is connected to the bottom of the water tank 1b as the second liquid tank. And the 2nd detection characteristic of the water level detector 9b corresponds with the 1st detection characteristic of the water level detector 9a. The first detection characteristic and the second detection characteristic will be described later.

  Next, the water level detector 9b has a height (installation position) depending on various factors such as a difference in the shape of the water tank 1b between the site and the design drawing or a change in the installation position due to construction work. The height is different from that of the water level detector 9a. That is, the water level detector 9b is attached at a position lower than the water level detector 9a attached at the designed installation position by a distance R.

  Since the water level detectors 9a and 9b are attached at such installation positions, even if the first detection characteristic and the second detection characteristic coincide with each other, the water level detectors 9a and 9b correspond to the same water level in the water tanks 1a and 1b. There will be a slight shift in the detected value detected by. In the liquid level control system 20 according to this embodiment, the above-described deviation of the water level detector 9b is corrected by the correction means described later, so that the main detector that is the source of control of the control panel 10 smoothly. Switching is possible, and water level control with higher accuracy and reliability can be performed.

  Below, the correction | amendment method of the water level detector 9b which is a 2nd detection means is demonstrated.

  FIG. 11 is a graph showing the concept of correction of the detection means in the liquid level control system shown in FIG.

First, referring to FIG. 11 (1), this graph shows the first detection characteristic of the water level detector 9a in FIG. The first detection characteristic has a first linear characteristic in which an increase in the water level (liquid ratio) indicated on the vertical axis is proportional to an increase in the detection value X indicated on the horizontal axis. That is, when the water tank 1a is a lower limit water level A, the detection value from the water level detection value 9a is X _1, when the water tank 1a is an upper limit water level H, the detection values from the water level detector 9a becomes X _2. The detected value on the horizontal axis is generally obtained by a voltage value of 1 to 5 V or a current value of 4 to 20 mA in a hydraulic water level detector. However, in the liquid level control system according to the present invention, the obtained voltage value or current value is converted into a digitized signal having a dimensionless number, for example, 0 to 4000, and then stored in the storage means.

  Next, referring to (2) of FIG. 11, this graph shows the second detection characteristic of the water level detector 9b in FIG. The state before correction is indicated by a two-dot chain line, and the state after correction is indicated by a solid line.

As described above, the first detection characteristic of the water level detector 9a matches the second detection characteristic of the water level detector 9b. That is, the second detection characteristic has a second linear characteristic in which the increase in the water level (liquid ratio) shown on the vertical axis is proportional to the increase in the detection value X shown on the horizontal axis, and the slope thereof is the first straight line. It is the same as the characteristic. However, since the installation position of the water level detector 9b with respect to the water level detector 9a is lower by the distance R, the detection values corresponding to the same water level in the water tanks 1a and 1b are different from the water level detector 9a. For example, if the lower limit level A, the detection value of the water level detector 9a is a X _1, the water level detector detects values of the water level plus the distance R at the lower limit level A 9b X _{1 +} α. Further, when the upper limit water level H, the detection value of the water level detector 9a is a X _2, the water level detection value X _{2 +} alpha of plus distance R to the upper water level H in the water level detector 9b.

The liquid level control system according to this embodiment includes correction means for correcting such a deviation. Then, the second linear characteristic in a state before correction indicated by a two-dot chain line is calculated (moved) as indicated by an arrow in the figure. That is, the points S ₁ and S ₂ on the two-dot chain line are moved to the points T ₁ and T ₂ on the solid line. Then, the detection value by the 2nd detection means corresponding to the same water level as a specific water level corresponds with the specific detection value of the 1st detection means corresponding to the specific water level of the water tank 1a. Therefore, even if the first detection characteristic of the water level detector 9a is different from the second detection characteristic of the water level detector 9b, the control of the water level of the water tanks 1a and 1b is not affected.

  By such correction, even if the installation heights of the water level detectors 9a and 9b having detection characteristics that match each other are different, these detection values match. Therefore, since the installation accuracy of the water level detectors 9a and 9b does not become a problem, work efficiency is improved.

  FIG. 12 is a schematic configuration diagram of a liquid level control system according to the seventh embodiment of the present invention.

  Since the description is basically the same as that according to the sixth embodiment, the difference will be mainly described.

  Referring to the figure, in this embodiment, the water level detectors 9a and 9b are mounted at the same installation height, but the first detection characteristic of the water level detector 9a and the first level of the water level detector 9b are the same. The two detection characteristics have different linear characteristics. That is, the first detection characteristic and the second detection characteristic do not match. Such a state is caused, for example, when the water level detector 9b becomes malfunctioning due to secular change or the like and the water level detector 9b needs to be replaced. That is, even if a water level detector having the same model and the same model number as the water level detector 9b before replacement is installed, the detection value (detection characteristics) varies between before and after replacement. In addition, about the water level detector 9a which does not require exchange, the 1st linear characteristic is memorize | stored in the memory | storage means mentioned above.

  In such a case, an error occurs when switching the main detector due to a difference in detection characteristics before and after the replacement. Therefore, in the liquid level control system 20 according to this embodiment, the second detection characteristics are changed. Make corrections. Below, the correction | amendment method of the water level detector 9b which is a 2nd detection means is demonstrated.

  FIG. 13 is a graph showing the concept of correction of the detection means in the liquid level control system shown in FIG.

First, referring to (1) of FIG. 13, this graph shows the second detection characteristic of the water level detector 9b in FIG. The second detection characteristic has a second linear characteristic in which the increase in the water level (liquid ratio) indicated on the vertical axis is proportional to the increase in the detection value X indicated on the horizontal axis. That is, when the water tank 1b is lower limit level A, the detection value from the water level detection value 9b is X _3, when the water tank 1b is an upper limit water level H, the detection values from the water level detector 9b becomes X _4. The first detection characteristic of the water level detector 9a is the same as that shown in (1) of FIG.

Next, referring to (2) of FIG. 13, in this graph, the first linear characteristic of the water level detector 9a indicated by a solid line and the second linear characteristic of the water level detector 9b indicated by a two-dot chain line are superimposed. Is. As described above, the first linear characteristic and the second linear characteristic have different inclinations, and the first detection characteristic and the second detection characteristic do not match. In the second linear characteristic, by deriving points P and Q from two detection values X ₅ and X ₇ by the water level detector 9b corresponding to two different water levels I ₁ and I ₂ , The characteristics can be specified.

  Then, based on the first linear characteristic stored in the storage unit, the specified second linear characteristic is calculated and moved as indicated by the arrow in FIG. 13 to correct it. By correcting in this way, even if the detection characteristics and installation heights of the water level detectors 9a and 9b are different, these detection values match. Therefore, since the second detection characteristic of the water level detector 9b or the installation accuracy at the site does not matter, an efficient liquid level control system is obtained.

It should be noted that, based on the water level I ₁ and the detected value X _{6 at} the solid line R, the detected value X ₅ at the point Q of the two-dot chain line is confirmed, so that the water level detector 9b is in the correct installation position, that is, in FIG. Whether the detection characteristic (1) is achieved can be confirmed on site.

  In addition, in said 5th Embodiment, although the auxiliary water tank which is an auxiliary liquid tank is formed in the specific shape, it is installed corresponding to the water tank and has a horizontal cross-sectional area smaller than the horizontal cross-sectional area of the water tank. As long as it is formed so that the fluctuation level of the liquid level of the liquid that can be held overlaps at least part of the fluctuation level of the liquid level of the liquid that can be held by the water tank, other materials and shapes may be used. .

  In the fifth embodiment, the water level detector is connected to the water tank and the auxiliary water tank by a specific structure. However, the water level detector is connected to the water tank and the auxiliary water tank so as to be switched freely. Any other structure may be used as long as a corresponding value can be detected.

  Furthermore, in said 5th Embodiment, although there is one water tank, even if there are multiple water tanks, it is applicable similarly.

  Furthermore, in the sixth embodiment, the first detection characteristic and the second detection characteristic have a linear characteristic. For example, even if the characteristic is a curve characteristic, the first detection characteristic and the second detection characteristic are used. It only needs to match the characteristics.

  Further, in the sixth embodiment, the second detection means is mounted at a low installation position with respect to the first detection means, but the second detection means is at a high installation position with respect to the first detection means. It may be attached.

  Furthermore, in the seventh embodiment, the first detection means and the second detection means are installed at the same height, but the second detection means has a different installation height with respect to the first detection means. Even if it is installed, the second linear characteristic is specified from the detection values of the second detection means corresponding to two different water levels, and this is based on the first linear characteristic stored in the storage means ( It can be corrected by calculation as shown in 2).

  Further, in the sixth and seventh embodiments, the correction unit corrects the second detection characteristic by a specific method. However, the correction unit is a first unit corresponding to the specific liquid level of the first liquid tank. Other methods may be used as long as the second detection characteristic is corrected so that the detection value by the second detection unit corresponding to the same liquid level as the specific liquid level matches the specific detection value of the detection unit. good.

  Further, in the sixth and seventh embodiments, the liquid ratio of the water tank is determined by the storage means and the determination means based on the detection values of the first detection means and the corrected second detection means. Although the water level of the water tank is controlled, other control methods may be used as long as the control is based on the detection values of the first detection means and the corrected second detection means.

  Furthermore, in the fifth to seventh embodiments described above, the water level of the water tank is controlled, but the present invention can be similarly applied to a device for controlling the liquid level of other liquids other than water.

  Furthermore, in the fifth to seventh embodiments, the water level detector detects the water level in the water tank by the water pressure. However, if the water level can be continuously detected, for example, the ultrasonic wave described above is used. It may be one that detects the water level in the water tank.

  Furthermore, in said 5th-7th embodiment, although the upper limit water level and the lower limit water level were memorize | stored by the memory | storage means, two different different water levels may be sufficient.

  Furthermore, in said 5th-7th embodiment, although the water tank has a fixed cross section, the water tank which does not have a fixed cross section may be sufficient.

  Furthermore, in the fifth to seventh embodiments, a plurality of liquid ratios are set as the set water level, but the set water level may not be set.

  Further, in the fifth to seventh embodiments, the combination patterns of three set water levels are stored, but it is only necessary to store a plurality of combination patterns of set water levels. Alternatively, it may not be stored.

  Furthermore, in said 5th-7th embodiment, although the memory | storage means which can newly memorize | store the detected value from the detection means corresponding to an upper limit water level and a lower limit water level is provided, the update of memory | storage However, it may be possible to have a storage means that cannot.

  Further, in the fifth to seventh embodiments, the liquid ratio corresponding to the reference liquid level with respect to the upper limit water level and the lower limit water level is stored, but the liquid level between the upper limit water level and the lower limit water level is directly stored. In addition, the control liquid level may be determined as the actual liquid level.

  FIG. 14 is a diagram showing an initial setting procedure of the liquid level control system shown in FIG. 1, and FIG. 15 is a diagram showing an initial setting screen on the touch panel of the control panel shown in FIG.

  Referring to these figures, first, the control panel is turned on (S1), and a screen for completion of setting preparation is confirmed.

  Next, a setting button on the top screen 51 is pressed, and 0% water level (lower limit water level) setting (S2) is performed on the 0% water level setting screen 53. In the 0% water level setting (S2), water is added to the lower limit water level of the water tank, the actual water level is measured using a tape measure or the like, and the detection value of the water level detector is set. When there are two water tanks and two water level detectors, the setting button on the top screen 51 is pushed, and the 0% water level setting (S2) is changed to No. 1 and No. 2 by the 0% water level setting screen 52. Separately, as in the case of the 0% water level setting screen 53, each setting is performed. After the setting is completed, when the determination button on the 0% water level setting screen 52 or the 0% water level setting screen 53 is pressed, the 0% water level determination screen 54 is displayed. When the determination button is pressed, the 0% water level setting (S2) is completed. .

  Next, 100% water level (upper limit water level) setting (S3) is performed on a 100% water level setting screen (not shown). The setting procedure is the same as the 0% water level setting (S2).

  The initial setting operation is thus completed. Since other set values, that is, set water levels such as the full water warning water level are stored in advance in the storage means as default values, the operation of the liquid level control system can usually be started only with the above initial settings. Therefore, the setting required for starting operation becomes very easy.

  16 is a diagram showing an example of a setting procedure in the liquid level control system shown in FIG. 1, FIG. 17 is a diagram showing an actual water level setting screen on the touch panel of the control panel shown in FIG. 1, and FIG. FIG. 19 is a diagram showing a bottom area setting screen on the touch panel of the control panel shown in FIG. 1, and FIG. 19 is a diagram showing a setting water level screen on the touch panel of the control panel shown in FIG.

  In the liquid level control system according to this embodiment, since the set water level is set in advance by a default value, it is only necessary to correct necessary items and the setting is easy.

  With reference to these drawings, first, the date and time are set (S31).

  Next, on the actual water level setting screen 55a shown in FIG. 17, the actual water levels of the 0% water level (lower limit water level) and the 100% water level (upper limit water level) measured during the initial setting described above are input in cm. For example, if the 0% water level (lower limit water level) is 50 cm and the 100% water level (upper limit water level) is 450 cm, enter 50 in the 0% part and 450 in the 100% part on the actual water level setting screen 55a. To do. Then, the height of the aquarium is set (S32) by pressing the enter button shown on the actual water level setting screen 55b.

Next, the bottom area of the aquarium is input on the bottom area setting screen 56a shown in FIG. The bottom area setting screen 56a is provided with two water tanks. In such a case, the bottom area of each of the first and second water tanks is input in m ² units, and the bottom area setting screen 56b is provided. Is pressed to set the water tank bottom area (S33). By setting the water tank bottom area (S33), it is possible to calculate the water weight in the water tank by calculating from the water level in the water tank, so even when managing the water volume by weight (t) It becomes possible to do.

  Next, each set water level is set (S34) on the set water level screen 57 shown in FIG. On the set water level screen 57, each set water level screen is displayed when the water level setting button is pressed. For example, when the full water warning button shown on the water level setting screen 57 is pressed, the set water level screen 58 is displayed, and the water supply stop water level setting screen is displayed. Further, as described above with reference to FIG. 4, for example, as shown in Table 1, a predetermined value is set in advance (S40), so only the changed portion needs to be changed. As a change method, the liquid ratio is changed by a value change button indicated by the up and down arrows on the set water level screens 57 and 58. Then, the determination button shown on the set water level screen 58 is pressed to set the set water level (S34).

  Next, the chattering value is set (S35). This is to prevent a phenomenon in which alarms are repeatedly generated and canceled due to the water surface of the aquarium rippling, and is set as 3% as a default value.

  Next, a period timer setting (S36) and a weekly timer setting (S37) are performed, which will be described later.

  Next, the preceding operation time is set (S38). This is set, for example, when switching from the standard water level operation to the low water level operation at midnight due to the setting of the period timer (S36) or the like, and when it is necessary to operate the switch earlier.

  The setting operation is thus completed.

  20 is a diagram showing an example of a normal operation procedure in the liquid level control system shown in FIG. 1, and FIG. 21 is a diagram showing a period timer setting screen on the touch panel of the control panel shown in FIG.

  If the amount of water used is very small compared to normal, such as during school summer holidays, the amount of water stored in the aquarium must be reduced to increase the circulation rate. The residual chlorine concentration of water is lowered, and there is a risk of problems in hygiene. For this reason, in the liquid level control system according to this embodiment, the start date and the end date of the period are set so that the set water level can be selected from the operation mode of the standard water level, the intermediate water level, and the low water level. It has become. In this setting period, nine periods can be set.

  With reference to these drawings, first, an operation mode selection (S21) is performed.

  Next, when the timer use is not selected (NO in S22), the timer is not selected, the manual setting (S29) is performed, and the operation is performed according to the operation mode selected in the operation mode selection (S21) (S30).

  If timer use is selected (YES in S22), period timer selection (S23) is performed. When the period timer is not selected (NO in S23), the weekly timer setting (S26) is performed, and the process proceeds to the day setting (S27). This day setting (S27) is used, for example, when the storage amount of the water tank is reduced on Saturday and Sunday within one week. In such a case, control is performed in a predetermined operation mode for each day of the week set by the day setting (S27) (S28).

  If the period timer is selected (YES in S23), the period setting (S24) is performed. Here, referring to FIG. 21, when the period 1 button is pressed on the period timer setting screen 59a, the start month date and the end month date of the period timer are input as shown in the period timer setting screen 59b. become. Next, when the operation mode to be used in this period is selected and the determination button is pressed, control is performed in a predetermined operation mode for each period set by the period setting (S24) (S25).

  As mentioned above, about the setting of a period timer, although the example which controls the storage amount of a tank comparatively rapidly based on the predicted water supply demand data was described, in addition to this, for example, the operation time of a water pump of a certain period By calculating the demand amount of water supply, a mode for automatic operation may be set based on this. If it does in this way, the setting change by manual will become unnecessary with respect to the increase in the mild water supply demand by the increase in a resident like a newly built apartment, and the water level control of a water tank will be attained automatically.

DESCRIPTION OF SYMBOLS 1 ... Water tank 9 ... Water level detector 15 ... Auxiliary water tank 20 ... Liquid level control system 41 ... Detection means 42 ... Memory | storage means 43 ... Calculation means 44 ... Discriminating means 45 ... Setting means 46 ... Control means The same code | symbol is shown in each figure Indicates the same or equivalent part.

Claims (3)

A liquid level control system for controlling the liquid level in a liquid tank,
The liquid tank is installed corresponding to the liquid tank, has a horizontal cross-sectional area smaller than the horizontal cross-sectional area of the liquid tank, and the fluctuation range of the liquid level of the liquid that can be held is the liquid level of the liquid that can be held by the liquid tank. A transparent auxiliary liquid tank that overlaps only a part of the fluctuation range,
Detecting means connected to the liquid tank and the auxiliary liquid tank in a switchable manner, and capable of detecting a corresponding value based on the liquid pressure for any liquid level of the liquid tank and the auxiliary liquid tank;
The connection of the detection means is switched to the auxiliary liquid tank, the liquid ratio with respect to each reference liquid level at any two different liquid levels in the auxiliary liquid tank, and the two detection values of the detection means corresponding to these, Storage means for storing
Corresponding to the control liquid level to be controlled in the liquid tank by switching the connection of the detection means to the liquid tank and the correlation between the liquid ratio determined by the two stored liquid ratios and the detected value and the detected value A liquid level control system comprising: a determination unit that determines a liquid ratio of the control liquid level based on a specific detection value of the detection unit. A liquid level control system for controlling the liquid level in a liquid tank,
The liquid tank is installed corresponding to the liquid tank, has a horizontal cross-sectional area smaller than the horizontal cross-sectional area of the liquid tank, and the fluctuation range of the liquid level of the liquid that can be held is the liquid level of the liquid that can be held by the liquid tank. A transparent auxiliary liquid tank that overlaps only a part of the fluctuation range,
Detecting means connected to the liquid tank and the auxiliary liquid tank in a switchable manner, and capable of detecting a corresponding value based on the liquid pressure for any liquid level of the liquid tank and the auxiliary liquid tank;
Storage means for switching the connection of the detection means to the auxiliary liquid tank, and storing any two different liquid levels in the auxiliary liquid tank and the two detection values of the detection means corresponding to them;
By switching the connection of the detection means to the liquid tank, the correlation between the liquid level determined by the two stored liquid levels and the detected value and the detected value corresponds to the control liquid level to be controlled in the liquid tank. A liquid level control system comprising: a determination unit that determines a liquid level of the control liquid level based on a specific detection value of the detection unit.   The said detection means is connected to the bottom part of the said liquid tank and the said auxiliary | assistant liquid tank, and detects the said corresponding value based on the liquid pressure by the liquid currently hold | maintained in each tank. Liquid level control system.

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