JPH04128908A - Liquid level detector and liquid supply controller - Google Patents

Abstract

PURPOSE:To accurately detect the water level of a water receiving tank even when erroneous connection between a detecting means and a controller is performed by providing a pattern setting part, a detection number arithmetic part, and a selection part at the controller. CONSTITUTION:The controller 12 of a liquid level detector is equipped with the pattern setting part 12a, the detection number arithmetic part 12b, and the selection part 12c. The pattern setting part 12a makes respective liquid level of the water receiving tank 1 and the number of detection of the detecting means 11a-11d into patterns based on the number of detecting means 11a-11d, and the detection number arithmetic part 12b finds the number of detecting means 11a-11d detecting liquid in the water receiving tank in detection, and the selection part 12c selects the liquid level state of the water receiving tank 1 corresponding to the number of detection of the detecting means 11a-11d, respectively. Thereby, it is possible to decide the liquid level state of the water receiving tank 1 appropriately even when the erroneous connection between the controller 12 and each detecting means of the detector 11 is performed.

Description

DETAILED DESCRIPTION OF THE INVENTION [Industrial Application Field] The present invention relates to a liquid level detection device for detecting a liquid level in a water receiving tank, and a liquid supply control device using the liquid level detection device.

[Prior Art] As a conventional technique of a liquid supply control device using a liquid level detection device, there is a technique shown in FIG. 11 and FIG. 12.

In the conventional liquid supply control device shown in FIGS. 11 and 12, a pump 3 is connected to the lower part of a water receiving tank 1 via a suction pipe 2.
One end of a water pipe 4 is connected to the discharge side of the pump 3. A gate valve 5 is provided in the middle of the suction pipe 2, and a check valve 6 is provided in the middle of the water pipe 4. Gate valve7. A pressure tank 8 is provided, and a pressure switch 9 is provided downstream of the pressure tank 8. When the pressure switch 9 is turned on in response to the pressure of the water supply, the pump 3 can be operated. By turning off the pump 9, the pump 3 can be stopped. Water is taken into the water tank 1 from a water supply source by a pole tap 10.

This liquid supply control device is equipped with a liquid level detection device that detects the water level in the water receiving tank 1. The liquid level detection device has a detector 11 consisting of, for example, three electrode rods 111a to 111c of different lengths. Among the electrode rods 111a to 111c, the third electrode rod 111c having the longest length serves as a ground electrode.
As shown in Figure 1, the first electrode rod 111a has the shortest length.
When the tip of the electrode is in water, the electrode rod 111a and the third electrode rod 111c form a closed circuit through the water, and
The second electrode rod 11 similarly forms a closed circuit to detect the presence of water in the water tank 1, and although not shown, the water flows to the first electrode rod 111a of the water tank 1. When it is below the tip and touches the tip side of the second electrode rod 111b, the second electrode rod 111b and the third electrode rod 1
11C forms a closed circuit through water and detects water, and the first electrode rod 111a and the third electrode rod 11
By forming an open circuit between the first electrode rod 11
1a detects the absence of water.

The liquid level detection device also includes a controller 12 that determines the water level state in the water tank 1 based on the output from the detector 11. When the first and second detection rods 111a and 1llb detect water, the controller 12 determines that the water level is sufficient to start the pump, and when only the second detection rod 111b detects water, the controller 12 starts the pump. It is determined that the water level is sufficient to stop 3.

Further, when the controller 12 determines that the water level is high enough to start the pump 3, the controller 12 transmits the liquid level relay 14 via the level switch 13 as shown in FIG.
switch 15 switches to the b contact side, and if the contact PS of the pressure switch 9 is on, the electromagnetic switch M
C is excited to start the pump 3, and the first electrode rod 111a does not detect water and the second detection rod 11
1b detects water and determines that the water level is stopped, the switch 15 of the liquid level relay 14 switches to the a contact side, and thereby, even if the contact PS of the pressure switch 9 is on, the electromagnetic opening/closing is performed. When the excitation of the pump MC is released and the pump 3 is stopped, an alarm buzzer BZ sounds and a lamp L is turned on.

For example, as shown in FIGS. 11 and 12, the liquid supply control device equipped with such a liquid level detection device is currently used when the water level in the water receiving tank 1 is high and the tip of the first electrode rod 111a is submerged in the water. It is assumed that the switch 15 of the liquid level relay 14 of the liquid level detection device is not switched to the b contact because it has sunk and is filled with water above the starting water level of the pump 3. At this time, as the demand side uses water, the pressure in the water pipe 4 decreases, and when the pressure switch 9 of the water pipe 4 detects this and turns on, the pump 3 is started by the excitation of the electromagnetic switch MC, and the water receiving tank The water within 1 will be sent to the demand side.

Next, when the demand side stops using water, the pressure in the water pipe 4 increases, the pressure switch 9 detects this and its contact P
Since S is turned off, the pump 3 is stopped and water supply is stopped.

Furthermore, if the water supply from the water supply source to the water tank 1 is cut off due to some abnormality, the water level in the water tank 1 will drop due to use by the demand side. For example, when the water level in the water tank 1 falls below the tip of the second electrode rod 111b of the detector 11, the second electrode rod 111b and the third electrode rod 111c
As a result, the switch 15 of the liquid level relay 14 switches to the a contact side, and the pump 3 is stopped by stopping the pump 3 even though the contact PS of the pressure switch 9 is in the on state. This prevents seizure of the sliding parts of the body, and at the same time, when the alarm buzzer BZ sounds, the lamp L lights up to notify the user of this fact.

Note that the detector 11 of the liquid level detection device has three electrode rods 111.
A to 111c are shown, but the detector 11
As shown in FIG. 13, there are four electrode rods 101a to 101.
d, and five electrode rods 11 as shown in FIG.
Some are composed of a to 11e. Four electrode rods 101
Among electrode rods a to 101d, electrode rods 101b to 101d correspond to the three electrode rods 111a to 111c, respectively.

The other electrode rod 101a is designed to detect the full level of water in the water tank 1. In addition, five electrode rods 11a to 11e
Among them, the electrode rods 11a, llb, and 11e are the electrode rods 1
01a, 101b, and 101d, the electrode rod 11c detects the low water level, and the electrode rod lid independently detects the stop water level.

[Problems to be Solved by the Invention] By the way, in the conventional water supply device, the installation location of the water receiving tank 1 and the installation location of the controller 12 of the liquid level detection device are far apart, and the installation location of the water supply device is separated after the construction work is completed. It is common for contractors to install liquid level detection devices.

However, if this is done, the wiring of the liquid level detection device, especially in the case of a detector with a large number of electrode rods, may cause the wiring of each electrode rod to be incorrect between the control 12 side and the water receiving tank 1 side. . That is, as shown in FIG. 11, the first electrode rod 111a is connected to the connection terminal E1 of the controller 12, the second electrode rod 111b is connected to the connection terminal E2, and the third electrode rod 111C is connected to the connection terminal E3. However, sometimes these connections are made incorrectly. As a result, the liquid level detection device did not operate properly, causing problems such as water outages and false alarms.

SUMMARY OF THE INVENTION In view of the problems of the prior art described above, an object of the present invention is to provide a liquid level detection device that can accurately detect the water level of a water tank even if there is an error in the connection between the detection means and the controller. Another object of the present invention is to provide a liquid supply control device that can appropriately control the water level of a water tank by using the liquid level detection device.

[Means for Solving the Problems] In order to achieve the above object, in the liquid level detection device of the present invention, the controller determines the respective liquid levels in the water tank and the number of detections of the detection means based on the number of each detection means. a pattern setting unit that patterns the presence or absence of liquid in the water tank; a detection number calculating unit that calculates the number of detection means that detect the presence or absence of liquid in the water tank at the time of detection; It is characterized in that it includes a selection section for selecting the position state.

Further, in the liquid supply control device of the present invention, the controller includes a pattern setting section that patterns each liquid level in the water tank and the number of detections by the detection means based on the number of each detection means; a detection number calculation unit that calculates the number of detection means that have detected the presence or absence of liquid in the tank; a selection unit that selects each liquid level state in the water receiving tank based on the number of detections by the detection means; The pump is characterized in that it includes a processing section that executes processes such as starting and stopping the pump according to the requirements.

[Function] As described above, the controller of the liquid level detection device includes a pattern setting section, a detection number calculation section, and a selection section, and the pattern setting section adjusts the respective liquid levels in the water tank based on the number of each detection means. and the number of detections by the detection means, the detection number calculation section calculates the number of detection means that detected the liquid in the water tank at the time of detection, and the selection section determines the liquid level in the water tank according to the number of detections by the detection means. Since the states are selected individually, the liquid level state of the water tank can be appropriately determined even if there is an erroneous connection between the controller and each detection means of the detector.

Further, as described above, the controller includes a pattern setting section, a detection number calculation section, a selection section, and a processing section, and the processing section executes processes such as starting and stopping the pump according to the selected liquid level state. Therefore, even if the liquid level in the water tank decreases,
It can prevent the sliding parts of the pump from seizing, etc.
Appropriate measures can be taken depending on the liquid level status.

[Example] Hereinafter, an example of the present invention will be described with reference to FIGS. 1 to 10. 1 to 6 show a first embodiment of a liquid supply control device using a liquid level detection device according to the present invention.

In the liquid supply control device of the embodiment, as shown in FIG. A water pipe 4 is connected to the discharge side. A gate valve 5 is provided in the middle of the suction pipe 2, and a check valve 6 is provided in the middle of the water pipe 4. Gate valve7. A pressure tank 8 is provided, and a pressure switch 9 is provided downstream of the pressure tank 8 to enable the pump 3 to be operated or stopped in accordance with fluctuations in the pressure of the water supply.

This liquid supply control device is equipped with a liquid level detection device. The liquid level detection device includes a detector 11 consisting of five electrode rods 11a to 11e of different lengths as detection means;
It has a controller 12 that determines the state of the water level in the water tank 1 based on the output from the detector 11.

Among the electrode rods 11a-lie of the detector 11, the longest electrode rod ie serves as a ground electrode, and the fifth electrode lie and the other first to fourth electrode rods 11a''d are exposed to water. By sinking to form a closed circuit, the state of each water level in the water tank 1 is detected.In other words, as the water level in the water tank 1 becomes higher, the first to fifth electrode rods 1
When all of electrodes 1a to 1ie sink to the water surface, the full water level is detected, and the water level subsequently falls, and when the fifth electrode rods 11b to 5th electrode rods except the first electrode rod 11a sink to the water surface, the pump 3 is started. The water level is detected, and when the water level falls further and the third to fifth electrode rods 11c to 11e sink to the water surface, it is detected that the water level is low.
When the fifth electrode rods 11d and 11e sink to the water surface, it is detected that the water level is at which the pump should be stopped. Therefore, the full water level is detected by the first electrode 11a, the starting water level is detected by the fifth electrode 11b, the low water level is detected by the fifth electrode 11c, and the stop water level is detected by the fourth electrode lid.

On the other hand, when the detector 11 consists of five electrode rods 11a to 11e, for example, as shown in FIG. The number of detections of ~lid and the respective water level states in the water tank 1 are patterned according to the magnitude of the number of detections.

That is, as shown in FIG. 2, when all (four) of the first electrode rods 11a to fourth electrode rods 11d sink to the water surface, the water level is considered to be full, and three electrode rods are at the water surface. The starting water level is set when two electrodes sink to the water surface, the water level is set to allow continued operation when two electrodes sink to the water surface, and the low water level is set when - one electrode rod sinks to the water surface. The emergency stop water level is when it does not sink and is above the water surface. For this reason, the controller 12, as shown in FIG.
A pattern setting unit 12a that patterns each liquid level state and the number of detected electrode rods in the water receiving tank 1 based on the number of electrode rods 1a to 11e; 11e, and a selection section 12c that selects the water level state in the water tank 1 according to the number of detections. At this time, the pattern setting section 12a determines the type of pattern based on the number of electrode rods connected to the controller 12, and selects five or three electrode rods by switching a switching means (switch, etc.) not shown. Alternatively, it is possible to switch to a pattern corresponding to the detector 11 using each of the four electrode rods.

Further, the controller 12 starts and stops the pump 3, and controls the lamp L according to the water level condition selected by the selection unit 12c.
It is provided with a processing section 12d that executes processing such as lighting of lights 1 and L2 and alarm BZ.

Next, the circuit diagram of the liquid supply control device with a liquid level detection device is shown in the third section.
This will be explained using figures.

In FIG. 3, the power supply P has a circuit breaker MCB.

Power supply R-S for control, contact MCa of electromagnetic switch MC, sensor section 49 of thermal relay for overload protection of pump 3. A motor M of the pump 3 is connected.

On the control power source R-3 side, there are a select switch SW, a contact PS of the pressure switch 9, and a transformer T.

Contact points 49a and the like of the sensor section 49 are connected. The select switch SW is designed to be able to switch between three modes.Putting it in the switch selects manual operation, switching it in the switch K puts it in automatic operation, and putting it in the switch J stops the operation. I'm trying to switch it up.

The contact point Ps of the pressure switch 9 is turned on and off according to the water supply pressure passing through the water pipe 4 shown in FIG.

One output section 50.51 of the transformer T is a stabilized power supply 2.
Microprocessor MP via capacitors C1 and C2
Connected to the power supply terminal VCCt VDD* vss of U,
Outputs 52,53 are connected to input terminals 52', 53' of the controller 12 of the liquid level detection device. In addition,
The output parts 54 and 55 of the transformer T are power sources between the first to fifth electrode rods 11a to 11e as detection means.

The microprocessor MPU is the controller 12 of the liquid level detection device and also controls the entire liquid supply device, and includes a crystal oscillator CL, resistor R1, capacitor C3.
- In addition to being connected to the clock generator circuit B consisting of C4, the output conversion circuits X of the electrode rods are connected to the input ports PcO to Pc3, respectively. Each output conversion circuit X includes transistors Tri, Tr2, . Photocoupler PH1
゜Diode bridge DBI, diode D1/D2,
Capacitors C5 and C6, resistors R2 to R7, buffer Bu
The output terminals are independently connected to each input port Pc0=Pc3 by a pass line.

Output portions 54 and 55 of the transformer T are connected to terminals 54'' and 55', respectively, and are connected to the first to fifth electrode rods 11a to 11e through terminals E1 to E5, respectively. In this case, the terminal E5 for the fifth electrode rod 11e, which is the ground electrode, is connected to the terminal 55'.

In addition, for convenience of explanation, FIG. 3 shows the connection state between the terminal El and the second electrode rod 11a, and the connection state between the terminal E5. The connection state between the fifth electrodes 1e is shown, and other parts are omitted from the drawing.

Each of the controllers 12 includes a fourth electrode 11a to a fourth electrode 11a, except for the fifth electrode 11e, which is a ground electrode.
d is detected, a low (Low) output or high (H) is output to the input port co-Pc3 of the microprocessor MPU.
igh) output. That is, as shown in FIG. 2, when all of the first to fourth electrode rods 11a to lid detect the full water level, a low input is made to all of PcO'' and Pc3, and the starting water level is determined by the three electrode rods. When detected, 3 bits are input low and 1 bit is input high, and when the two electrode rods detect a water level that allows continued operation, 2 bits are input low and 2 bits are input high, and one electrode is input low. When low water level is detected by the rod,
When only 1 bit is input and 3 bits are input high and the emergency stop water level is detected, the input port Pc0
- 4 bits are input high to all Pc3.

Also, the input section PAO of the microprocessor MPU.

The select switch SW, the contact PS of the pressure switch 9, and the contact 49a of the sensor section 49 are connected to PAL via the input interface IF, and the output section PBO-PB is connected to PAL.
3 connects the electromagnetic switch MC via the output interface OIF
, alarm BZ with changeover switch TS, lamp LX
, L2, respectively.

The microprocessor MPU includes each controller 12
memory as quantized data based on the output from (
RAM). For example, as shown in Figure 4,
The register of the microprocessor MPU is cleared in advance (701), and the input state of each input port PcO to Pc3 is sequentially determined as on or off, and only the number of ON inputs is counted (702 to 709). , the counted number is stored in the memory level (710), and then the process returns to the original state. In that case, the data stored in the level and the pattern of the water level state are: 04H indicates a) full water level, 03H indicates starting water level, o2H indicates c) water level that allows continuous operation, and OIH indicates 2) low water level. , OOH represent e) emergency stop water level, respectively. In addition, 702, 704,
At the time of determination at 706 and 708, it means that if each output conversion circuit X outputs a low level, it will turn on, and if it outputs a high level, it will turn off.

The microprocessor MCU also controls the liquid supply control device based on data stored in the level.

The control contents of this liquid supply control device will be explained with reference to FIGS. 5 and 6.

FIG. 5 shows a case where the liquid supply control device executes the interrupt process, and the subroutines 701 to 710 shown in FIG.
After storing the water level detection data in the level (RAM) by executing the process (801), it is determined whether or not the pump 3 is out of order, and the result is stored in the memory NG (R
AM) (802). In this case, when the pump 3 is out of order, it is set as 0OH1, and when it is normal, it is set as OIH, etc.

Next, a subroutine for determining the operation mode of the liquid supply control device is executed, and the result is stored in the memory MODE (RAM) (804). For example, as MODE data,
0IH1 for automatic operation 00 for manual operation
It is set as H, etc.

Thereafter, when processing 804 is executed, the interrupt processing is exited and the main program is executed as shown in FIG.

That is, in the main program, as shown in Fig. 6, it is determined whether the data in the memory MODE of the operation mode is 0IH (auto) or not (901), and if it is OLH, the following 9 is executed.
The process proceeds to 02, and in the case of 0OH (manual), the process is repeatedly executed until OIH is reached.

In 902, it is determined whether the data in the pump memory NG is 0IH (normal). At this time, memory NG is 0OH
(Failure), the loop is repeatedly executed until OIH, and when OLH, the process advances to the next step 903.

In 903, it is determined whether the memory level data is OOH. If the result is OOH, it means that the water level in water tank 1 has fallen below the emergency stop level, so 9
04, where the microprocessor MPU outputs the output ports PBO:O, PB1:1 . PH1:1. PH1:O
Outputs the signal. As a result, the electromagnetic switch MC is demagnetized, the buzzer BZ sounds, and the lamp L1 lights up, so that it is possible to display that the water level is low.

On the other hand, in 903, the memory level data is 001
If not, is it 0IH (low water level) in 905?
Is it 02H (water level that allows continued operation) in 906?9
Is it 03H (starting water level) in 07, or 0 in 908?
It is sequentially determined whether the water level is 4H (full water level) or not.

In that case, first, if it is OLH at 905, proceed to 904 as described above, but if it is not OIH, proceed to the next step 906, and if it is 02H at 906, it means to continue the previous state. Similarly, the process proceeds to 904, but if it is not 02H, the process proceeds to 907. If it is 03H in 907, the process proceeds to 910, which will be described later, but if it is not 03H, the process proceeds to 908.

If it is 04H at 908, it means the water level is full, so 90
Proceed to step 9, where the microprocessor MPU outputs the output port PBO: 1. PBI: 1. PH1:0, PH1
:1 signals are output respectively. As a result, electromagnetic switch M
C is energized, the buzzer BZ sounds and the lamp L2 lights up, so it is possible to display that the water level is full.
The process then proceeds to 910. Note that if it is not 04 in 908, the process also proceeds to 910.

At 910, the microprocessor MCU determines whether or not the contact PS of the pressure switch 9 is on. If it is on, the process proceeds to the next step 911, but if it is not on, the process returns to 901 and subsequent steps.

In 911, the microprocessor MCU outputs the output port P.
By outputting a signal of BO:1, the electromagnetic switch MC is excited (911), thereby causing the pump 3 to supply water. At this time, after a time count (for example, about 5 seconds with a soft timer) is performed in the primary step 912, it is determined in step 913 whether or not the contact PS of the pressure switch 9 is off.

As a result, if it is off, the process proceeds to 914, where a signal from the output port PBo:0 is output to stop the pump 3, and then the process returns to 901. If the contact PS is not turned off, that is, if it is turned on, the process proceeds to 915, where it is determined whether the pump 3 is OIH or not in order to detect whether the pump 3 is out of order or not based on the data in the pump memory NG. do.

As a result, in the case of 0IH (normal), 9
After executing the processes from 03 to 909, the processes from 912 onwards are repeated, but if it is not OIH, it means that the status is OOH and there is a failure, so the processes from 914 onwards are executed.

In the embodiment, as described above, the microprocessor MPU as the controller 12 of the liquid level detection device controls the electrode rod 12.
Since the water level state in the water tank 1 is selected from a predetermined pattern based on the number of detections of electrode rods 12a to 12e,
Even if the 12e and the microprocessor MPU are connected incorrectly, the water level state can be reliably detected.

Moreover, as shown in FIG. 1, the microprocessor MPU has predetermined a plurality of types of patterns according to the number of electrode rods by the pattern setting section 12a, so that the microprocessor MPU has a plurality of types of patterns determined in advance according to the number of electrode rods, so that the pattern setting section 12a determines in advance a plurality of types of patterns according to the number of electrode rods. Patterns can be selected. For example, if there are five electrode rods, the full water level,
The pattern is the starting water level, continuous operation water level, low water level, and emergency stop water level.In addition, in the case of four electrode rods, as shown in Figure 7, the other three electrodes except for the fourth electrode rod as the ground electrode. When the electrode rod metal detects water, the water level becomes full, when two of the other three electrode rods detect water, the water level starts, and when the other one detects water, the water level stops. Although not shown in the case of three electrodes, when the other two electrodes (excluding the ground electrode) detect water, the water level is set to start, and when the other one detects water, the pump continues to operate at the water level, and those two are used to detect water. If not detected, a pattern of stopped water level, etc. will result. Therefore,
If patterns are determined for three, four, and five electrode rods, any number of electrode rods can be used.

Further, the microprocessor MPU operates the pump 3 and the lamp L1 according to the water level state obtained by the water level detection means.
・L2. By appropriately controlling the buzzer BZ, etc., when the water tank 1 is full, the surrounding people are reliably notified of this fact, and when the water level falls below the low water level, the pump 3 is stopped, so that the sliding part of the pump 3 is Since seizing can be prevented, appropriate measures can be taken depending on the water level condition.

FIGS. 8 to 10 show other embodiments of the liquid supply control device of the present invention.

In this case, the pump 2 is used to send water from the water tank 1 to an elevated water tank 21 installed on the roof of an apartment building, etc., and the water from the elevated water tank 21 is sent to each demand destination. .

That is, the water tank 1 is provided with three electrode rods 31a to 31C, and the elevated water tank 21 is also provided with three electrode rods 41a to 31C.
41c is provided. Each of the electrodes 31a to 31c and 41a to 41c on the elevated water tank side and the water receiving tank side is a third electrode 31c.

41c is the longest and serves as a ground electrode.

As shown in FIGS. 8 and 9, the third electrodes 31c and 41c are connected to the connection terminal E5 of the controller 12, and the third electrode 31a and the second electrode 31b on the water tank side are connected to each other. are connected to the connection terminals E1 and E2 of the controller 12, and the first electrode rod 41a and the second electrode rod 41b on the elevated water tank side are connected to the connection terminals E3 and E4 of the controller 12. , second electrode rod 31a.

31b may be connected to either the connecting terminal E1 or E2, and the first . The second electrode rods 41a, 41b may be connected to either of the connection terminals E3 and E4, and in any case, it is sufficient as long as the connections to the terminals do not overlap.

As shown in FIG. 10(a), the controller 12 controls the first electrode rods among the electrode rods 31a to 31c on the water tank side.
When the second two electrodes 31a and 31b detect water, the selection unit 12c determines the starting water level for starting the pump 3 by inputting it to the input ports Pc0-Pcl of the microprocessor MPU as shown in the figure. If one of the second electrode rods 31b detects water, it is determined that the water level is continuous to continue the operation of the pump 3, and the first,
If neither of the second two electrode rods 31a, 31b detects water, it is determined that the water level is at a stop level for stopping the pump 3. On the elevated water tank side, see Figure 10 (
As shown in b), among the electrode rods 41a to 41c, the first,
If neither of the second two electrode rods 41a, 41b detects water, the input port Pc of the microprocessor MPU
2 to Pc3 as shown in the figure, it is determined to be the starting water level of the pump 3, and when one of the third electrode rods 41b detects water, it is determined to be the water level for continued pump operation,
Furthermore, first and second electrode rods 41a.

When the two pipes 41b detect water, it is determined that the water level is at which the pump should stop. Therefore, by switching a changeover switch (not shown), the pattern setting unit 12a adjusts the starting water level, continuous water level, and stop water level according to the number of electrode rods on the water receiving tank side and the elevated water tank side by switching means (not shown). I try to set it to three patterns.

Note that although FIG. 9 mainly depicts the explanatory portion, the other portions are the same as FIG. 3.

In this way, the controller 12 starts and stops the pump 3 by detecting the electrode rods 31a to 31c installed on the water tank side and the electrode rods 41a to 41c installed on the elevated water tank side. The water levels in the water tank 1 and the elevated water tank 21 can be determined reliably, and at that time, as long as both third electrode rods 31c and 41c are connected to the connection terminal E5 as a ground electrode, 1. Second electrode rod 31a
.

31b and the electrode rods 41a, 41b are connected to the terminal El.

E2 and connecting terminal E3. All you need to do is connect to one of them so that they do not overlap each other.

In the previous embodiments, the controller 12 of the liquid level detection device also serves as the control means of the liquid supply control device, and an example was shown in which a microcomputer was used. Detected number calculation section 31b and selection section 31
It is not limited to a microcomputer as long as it has the functions of c and processing section 12d, and this example is not limited to only those that handle water, but can of course be applied to those that handle liquids other than water. be.

[Effects of the Invention] As described above, according to claim 1 of the present invention, the controller of the liquid level detection device uses the pattern setting section to determine the liquid level in the water receiving tank and the detection means based on the number of each selection means. The number of detections is patterned, the detection number calculation section calculates the number of detection means that have detected the liquid in the water tank, and the selection section selects each liquid level state of the water tank according to the number of detections. Even if there is a mistake in the connection between the detection means and the controller, the liquid level can be determined accurately, resulting in the effect that reliability as a liquid level detection device can be obtained.

According to claim 2, the controller executes processes such as starting and stopping the pump based on the pattern setting section, the detection number calculation section, the second selection section, and the selected pattern and pressure switch. Therefore, there is an effect that appropriate control can be performed according to the liquid level in the water receiving tank.

Furthermore, according to claims 2 and 4, since the pattern setting section determines various patterns by switching the switching means, various numbers of detection means can be used, which is very beneficial for the user.

[Brief explanation of the drawing]

Fig. 1 is a schematic piping diagram showing a first embodiment of a liquid supply control device using a liquid level detection device according to the present invention, and Fig. 2 is a relationship between the number of detected electrode rods consisting of five electrodes and the breakdown of the pattern. 3 is a circuit diagram showing the main parts of the entire liquid supply control device, FIG. 4 is a flowchart showing the process of water level determination based on the number of detected electrode rods and the contents of the pattern, and FIG. A flowchart showing the relationship between the overall processing procedure of the liquid supply control device and the processing content of water level determination, Fig. 6 is a flowchart showing the processing procedure of the liquid supply control device, and Fig. 7 shows the number of detections of four electrode rods. An explanatory diagram showing the relationship with the pattern breakdown, Fig. 8 is a schematic piping diagram showing another embodiment of the liquid supply control device in which three electrode rods are installed in the water receiving tank and the elevated water tank, and Fig. 9 is Figure 10 (a) is an explanatory diagram showing the relationship between the number of electrode rods detected on the water tank side and the pattern breakdown, and Figure 10 (b) is a circuit diagram showing the main parts of the liquid supply control device. An explanatory diagram showing the relationship between the number of electrode rods detected and the pattern breakdown, FIG. 11 is a piping diagram showing a liquid supply control device using a conventional liquid level detection device,
FIG. 12 is a control circuit diagram of a conventional controller, FIG. 13 is an explanatory diagram using four electrode rods, and FIG. 14 is an explanatory diagram using five electrode rods. DESCRIPTION OF SYMBOLS 1... Water tank, 21... Elevated water tank, 3... Pump, 9... Pressure switch, PS... Pressure switch contact, 11... Detector, lla-lle, 31a-31
c. 41a to 41c,... electrode rod, 12... controller, 12a... pattern setting section, 12b... detection number calculation section, 12c... selection section, 12d... processing section, L
l, L2...Lamp, BZ...Alarm buzzer, X...
・High force conversion circuit for electrode rod.

Claims (1)

[Scope of Claims] 1. A liquid level detection device having a detector comprising a plurality of detection means for detecting the presence or absence of liquid in a water receiving tank, and a controller that determines the liquid level in the water receiving tank based on the detection of each detection means. In the controller, the controller includes a pattern setting unit that patterns each liquid level in the water tank and the number of detections by the detection means based on the number of each detection means, and a pattern setting unit that detects the presence or absence of liquid in the water tank at the time of detection. 1. A liquid level detection device comprising: a detection number calculation unit that calculates the number of detection means; and a selection unit that selects each liquid level state in a water receiving tank based on the number of detections by the detection means. 2. In claim 1, the pattern setting section presets the liquid level state in the water tank in various patterns according to the number of each detection means, and selects any type of pattern by the switching means. Characteristic liquid level detection device. 3. A liquid level detection device consisting of a detector consisting of a plurality of detection means for detecting the presence or absence of liquid in the water receiving tank, a controller that determines the liquid level position in the water receiving tank by the detection of each detection means, and In a liquid supply control device having a pump that supplies water to a demand site, and a pressure switch that detects water supply pressure, the controller determines the respective liquid levels in the water tank and the number of detections by the detection means based on the number of each detection means. a pattern setting unit that patterns the presence or absence of liquid in the water tank; a detection number calculating unit that calculates the number of detection means that detect the presence or absence of liquid in the water tank at the time of detection; 1. A liquid supply control device comprising: a selection section that selects a liquid level state; and a processing section that executes processes such as starting and stopping a pump according to the selected liquid level state and pressure switch. 4. In claim 3, the pattern setting section presets the liquid level state in the water tank in various patterns according to the number of each detection means, and selects any type of pattern by the switching means. Characteristic liquid supply control device.