JP2000319955A - Control device of pressurized water feeding water supply equipment - Google Patents

Abstract

PROBLEM TO BE SOLVED: To prevent the situation of causing water cutoff before an engineer arrives at a job site by sufficiently securing time up to water cutoff from giving of a water reduction warning only by adding few parts and changing a circuit. SOLUTION: A water level in a water receiving tank is detected in three stages by using a level detector LS1 composed of a single common electrode bar E4 and three level detecting electrode bars E1, E2, E3 to respectively generate a full water warning signal, a water shortage warning signal, a force feed pump idle rotation preventive signal and a force feed pump restoring signal. Then, the level detecting electrode bar having the intermediate length is separated from the level detector LS1 to be connected to a newly added level detector LS2, a water reduction warning signal is generated by the output, and an interelectrode electric continuity control means is arranged for forcedly electrically continuing/discontinuing an intermediate length electrode terminal and a common electrode terminal of the existing level detector LS1 so that a force feed pump restoring signal S3 is generated by intermediate length detecting output of the existing level detector LS1.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a control device for a pressurized water supply type water supply system using an electrode rod type level detector (generally called a "floatless switch").
In particular, while maintaining the existing electrode rod configuration and wiring configuration, etc. as much as possible, by adding only a few parts and circuit changes to this, sufficient time from issuing the water reduction alarm to turning off the water can be secured. Also, the present invention relates to a control device for a pressurized water supply type water supply facility suitable for managing water supply facilities in an apartment or the like by remote centralized monitoring so as to prevent a situation in which a water shortage occurs before a technician arrives at a site.

[0002]

2. Description of the Related Art Water supply systems for multi-story buildings such as buildings and condominiums have been changed from a hydraulic head water supply system using an elevated water tank to a pressurized water supply system using a pressure pump, and a pressure booster that does not require an elevated water tank or a pressure pump. It is shifting to a direct water supply system. However, due to the financial situation of the water utility,
The spread of the direct pressure boost system has been delayed in some regions, and the number of properties using the pressurized water supply system is still increasing.

Conventionally, the facility management (including the management of water supply facilities) of this kind of multi-story building has been mainly performed by an individual resident management system in which a manager is resident. However, recently, there has been a demand for reduction of management costs. Centralized management of multiple properties using a telephone line, etc., without the presence of managers, and a centralized management system, while dispatching a technician to the property whenever an emergency such as an accident occurs. It is switching to the system.

[0004] The applicant company is a person who has long been involved in equipment management by a remote centralized management system. When a new building or condominium management order is received and the management method is changed from individual resident management to remote centralized management, a new financial burden should not be imposed on the customer side when changing the management method, and Even after switching to remote centralized management, it is important to provide services of the same or better quality as those of individual resident management.

From this point of view, focusing on remote centralized management of water supply facilities such as condominiums, when an abnormality occurs in the water supply system for some reason, it is necessary to avoid water supply interruption as much as possible, and when water supply interruption occurs, Restoring as soon as possible is extremely important from the viewpoint of maintaining or improving customer service. To do so, the situation leading to a water outage is detected early and automatically sent to the monitoring center via a telephone line or the like (performed via the alarm receiving board of each property), so that the technician can arrive at the site. Time must be secured.

[0006] Many of the existing water supply equipment control devices are designed on the premise of the individual resident management system. As described above, in order to detect a situation leading to a water outage at an early stage and automatically notify the monitoring center of the situation, as described above. Some kind of renovation work is required. For example, in the case of a head pressure water supply system using an elevated water tank, the electrode rods (for level detectors) that had been used to detect drought in the elevated water tank were made shorter, and the detection output of the same electrode rod was used to substantially reduce the output. Low water warning signal (drought warning signal)
By generating, the problem of securing the required time for technician arrival can be solved without extra cost.

[0007]

However, in the case of a pressurized water supply system using a pressurized pump, it is very difficult to carry out renovation work at a low cost due to various circumstances described below.

FIGS. 5 to 7 show the configuration of a control device conventionally used in many of the existing pressurized water supply type water supply facilities. 5 is a diagram showing an example of level setting in a conventional four-electrode system, FIG. 6 is a diagram showing a system configuration of a conventional control device as a whole, and FIG. 7 is a diagram showing internal connections of a conventional pump control panel. is there.

As shown in these figures, this control device includes four electrode rods E1 to E attached to a water receiving tank W.
4 (see FIG. 5) and a level detector LS1 (see FIG. 7) housed in the pump control panel CP. The four electrode rods E1 to E4 are composed of one common electrode rod E4 and three level detection electrode rods E1 to E3, so that the water level in the water receiving tank W is set at three levels. L1, L2 and L3 can be detected.

[0010] The four electrode rods E1 to E4 are electrically connected to external input terminals T1 to T4 in the pump control panel CP via a four-core cable CB. The level switch LS1 is generally called a floatless switch or the like, and includes three systems corresponding to the levels L1, L2, and L3 in the water receiving tank W based on signals from the terminals T1 to T4. Switches (contacts) LS1-1, LS1
-2, a control circuit (not shown) for controlling the on / off of the LSs 1-31, 32 is incorporated. In FIG. 7, the switches SW1, SW2, SW3-1, and SW2 are shown outside the level detector LS1.

The switch LS1-1 is set to turn on when the water level in the water receiving tank W is higher than the level L1, and to turn off when the water level is lower than the level L1, and the output of the switch LS1-1 is connected to an external output terminal B4. Is sent to the outside as a full-water warning signal S4.

The switch LS1-2 is set to turn on when the water level in the water receiving tank W is higher than the level L2 and to turn off when the water level is lower than the level L2. The output of the switch LS1-2 is an external output terminal. Pumping pump recovery signal S3 from B3
Is sent to the outside.

The switch LS1-31 is set to turn off when the water level in the water receiving tank W is higher than the level L3 and to turn on when the water level is lower than the level L3.
The output of 1 is sent from the external output terminal B6 to the outside as a compression pump idle rotation prevention signal S6.

The switch LS1-32 is set so as to turn off when the water level in the water receiving tank W is higher than the level L3 and to turn on when the water level is lower than the level L3.
The output of No. 2 is sent from the external output terminal B5 to the outside as a drought warning signal S5.

As shown in FIG. 6, in a water supply system employing a pressurized water supply system, water is generally supplied to the water receiving tank W via a constant water level valve CV, and water is pumped out. The water supply is performed via a pressure pump P. Water supply side supply, midway water supply piping, constant water level valve CV, and
As long as all the pumps P are normal, the water level in the water receiving tank W is maintained at a substantially constant value determined by the capacity of the constant water level valve CV.

On the other hand, when the supply of water is dripped due to a failure of the constant water level valve CV or the like, when the water level in the water receiving tank W reaches the level L1, the switch LS1-1 is turned on from off. By turning, the full water warning signal S4 is generated. Further, when the supply of water is cut off due to a failure of the constant water level valve CV or the like, when the water level in the water receiving tank W reaches level 3, the switch LS1-32 is turned on from off to turn on, and a drought warning is generated. A signal S5 is generated. At the same time, the switch LS1-31 also turns from off to on, so that the pumping pump idling prevention signal S6 is generated. On the other hand, when the function of the constant water level valve CV is restored from this state, when the water level in the water receiving tank W reaches the level L2, the switch LS1-2 is turned on from off to on.
The pumping pump recovery signal S3 is generated.

As described above, in the conventional control device for the pressurized water supply type water supply system, the four electrode rods including one common electrode rod E4 and three level detection electrode rods E1 to E3 are used. The water level in the water receiving tank W is detected at three levels L1, L2 and L3 using the level detector LS1 having
Among the level detecting electrode rods E1 to E3, the detection output of the shortest electrode rod E1 outputs a full-water warning signal S4, and the detection output of the longest electrode rod E3 outputs a drought warning signal S5 and a pumping prevention signal S6. Is further configured to generate a pumping pump recovery signal S3 based on the detection output of the intermediate length electrode rod E2. The reason why the pumping pump idling prevention signal is generated and output at the level L3 is to prevent the pumping pump from sucking air and becoming inoperable (idling state).

In such a conventional control device, 1
Since this electrode rod E3 is used for both the generation of the drought warning signal S5 and the generation of the pumping pump idling prevention signal S6, no matter how the length of the electrode rod E3 is shortened, a situation leading to water outage is found early. To notify the monitoring center. This is because when the drought warning signal S5 is issued, the pump P is already stopped, and the water is cut off. That is, if the water level in the water receiving tank W is monitored based on the drought warning signal S5, a technician will be dispatched at the same time as the water cutoff.

In order to solve such a problem and secure the time required for the technician to arrive at the site, for example, as shown in FIG. By additionally providing a level detector separately and separately, it is conceivable to generate a water reduction warning signal separately from the drought warning signal S5 together with the detection of the level L4. Actually, such a five-electrode rod system is prepared as an option for each pump manufacturer. That is, when the water level in the water receiving tank W is reduced to the level L4, the technician can be dispatched from the nearest waiting station by issuing the water reduction warning signal, so that the technician can arrive at the site before the water supply is cut off. .

However, according to such a five-electrode rod configuration, it is necessary to connect the pump control panel CP and the electrode rods with a five-core cable CCB. Cable replacement,
The replacement of the electrode holder and the addition of the electrode rod are required, resulting in a great expense. That is,
Changing the management system from individual resident management to remote centralized management results in a large financial burden on the customer side.

The present invention has been made in view of such a conventional problem. The object of the present invention is to maintain the electrode configuration and wiring configuration of existing equipment as much as possible while maintaining a slight By simply adding the parts and changing the circuit, sufficient time was secured from issuing the low water warning to the interruption of water supply, so that the technician could be prevented from being out of water before arriving at the site. It is an object of the present invention to provide a control device for a pressurized water supply type water supply system suitable for water supply system management of condominiums by remote centralized monitoring.

[0022]

According to the present invention, in order to achieve the above object, a level detector having four electrode rods including one common electrode rod and three level detection electrode rods. Is used to detect the water level in the water receiving tank in three stages, and among the three level detection electrode rods, a detection output of the shortest electrode rod provides a full-water warning signal and a detection of the longest electrode rod. In the control device of the pressurized water supply type water supply equipment, which generates a drought warning signal and a pressure pump idle rotation prevention signal at the output, and further generates a pressure pump recovery signal at the detection output of the electrode rod of the intermediate length, By disconnecting the electrode rod for level detection from the level detector and connecting it to a newly added level detector,
A water reduction warning signal is generated at the detection output of the additional level detector, and the intermediate level electrode terminal and the common electrode terminal of the existing level detector are responsive to the detection output of the additional level detector. Is provided so as to generate a recovery signal of the pressure pump as before with the intermediate length detection output of the existing level detector.

Here, as the inter-electrode conduction control means, the contact is interposed between the intermediate-length electrode terminal and the common electrode terminal of the existing level detector, and is driven by the detection output of the additional level detector. It is preferable to include an auxiliary relay.

According to such a configuration, although a simple level detector and an auxiliary relay for the two electrode rods are added, the existing four electrode rod configuration and the wiring of the level detector can be used as they are. This eliminates the need for expensive cable replacement work, replacement of electrode holders, and additional work for electrode rods.Moreover, sufficient time is required from when a water reduction warning is issued until water is cut off, It is possible to prevent a situation in which water is cut off before arriving at the station.

Further, if a drought warning signal transmission terminal of an additional level detector is connected in parallel to a drought warning signal transmission terminal of an existing level detector, an alarm finally transmitted to the outside is provided. Since the signal is equivalent to a logical sum of the drought warning signal and the water reduction warning signal, it is not necessary to provide a new signal line for transmitting the water reduction warning signal, and the cost can be further reduced. .

[0026]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS Hereinafter, a preferred embodiment of the present invention will be described in detail with reference to the accompanying drawings. One embodiment of a control device for a pressurized water supply type water supply system to which the present invention is applied is shown in FIGS. FIG. 1 is a diagram showing an example of level setting in the four-electrode rod system of the present invention, FIG. 2 is a diagram showing a system configuration of the entire control device of the present invention, and FIG. 3 is an inside of an auxiliary relay used in the present invention. FIG. 4 is a diagram showing connections, and FIG. 4 is a diagram showing internal connections of a pump control panel used in the present invention.

As is apparent from a comparison between FIGS. 1 and 5 and FIGS. 4 and 7, the configuration of the electrode rod in the control device of the present invention and the internal connection of the pump control panel are the same as those in the conventional four electrode rod configuration. It does not change at all.

That is, as shown in FIG. 1, also in the present invention, the water receiving tank W has one common electrode rod E4 and E3.
There are provided four electrode rods including the level detection electrode rods E1 to E3, whereby the water level in the water receiving tank W can be detected at three levels L1, L2, L3.

As shown in FIG. 4, the level detector LS1 housed in the pump control panel CP has three switches (contacts) LS1-1, LS1-2, LS1-3.
1 and 32 are respectively built in. Then, the output of the switch LS1-1 is sent to the outside as the full-water warning signal S4 via the external output terminal B4. Switch LS
The output of 1-2 is sent out from the external output terminal B3 as a pumping pump recovery signal S3. Switch LS1-
The output of 31 is sent from the external output terminal B6 to the outside as a pressure pump idle rotation prevention signal S6. Switch LS
The output of 1-32 is sent from the external output terminal B5 to the outside as a drought warning signal S5. In the figure, B
C is a common terminal for external output.

However, some changes have been made to the external connection of the pump control panel CP in connection with the present invention. That is, the first change is that the external input terminal T
2 is the connection destination. As is apparent from FIG. 7, in the conventional example, the external input terminal T2 is directly connected to the electrode rod E2, whereas in the present invention, the external input terminal T2 is It is connected to an auxiliary relay RY (see FIG. 2). The second change is that between the external output terminal B5 and the common terminal BC, the b contact of the built-in contact U-1 of the additional level detector LS2 (see FIG. 2) and the existing level detector L
The b contact LS1-32 (see FIG. 4) of S1 is connected in parallel, whereby the low water warning signal S7 and the low water warning signal S5 are connected.
Is that the logical OR operation is performed. As a result, the state of the alarm signal (corresponding to the previous drought alarm signal S7) finally sent to the alarm receiver (not shown) is represented by the water reduction alarm signal S7. In addition, the auxiliary relay RY
The configuration of the additional level detector LS2 will be described later in detail.

Next, a configuration newly added in the present invention will be described with reference to FIGS. As shown in FIG. 2, in the present invention, the electrode rod E2 for level detection of an intermediate length is separated from the level detector LS1, and this is separated from the level detector LS2 newly added.
(In the example shown, the floatless switch 61 manufactured by OMRON Corporation is used.
F-GP-N) to generate a water reduction warning signal S7 at the detection output of an additional level detector LS2 (in this example, configured by an internal switch U-2). ing. Further, the detection output of this additional level detector LS2 (in this example, the internal switch U-1
), The existing level detector LS1
Between the electrode terminals (corresponding to the external input terminal T2) and the common electrode terminal (corresponding to the external input terminal T4). RY contact point RY-1), the existing level detector LS1 generates and outputs the pumping pump recovery signal S3 as before.

More specifically, the additional level detector LS2 includes a power transformer Tr and a power transformer T.
A control circuit U driven by the secondary output of r and two sets of SPDT contacts U-1 and U-2, which are switching-controlled by the control circuit U, are built in. This level detector LS2 operates with an AC 200V power supply. This power is supplied between the terminals (3-10) via the circuit breaker MCCB and the fuse F. Two electrode bars for level detection are connected between terminals (4-5). In this example, the terminal (4) is connected to a common electrode bar E4 for grounding, and the terminal (5) is connected to an electrode bar E2 for level detection. Two sets of S that are switching-controlled by the control circuit U
Of the PDT contacts U-1, U-2, the contact a of the contact U-1 is led out to the terminal (10-11), and the contact b of the contact U-2 is led out to the terminal (6-8). You. And the contact U-
The contact a of No. 1 is off when the terminals (4-5) are not conducting, and is on when the terminals are conducting, whereas the contact a of contact U-2 is on.
The contact is set to be on when the terminal (4-5) is non-conductive, and to be off when the terminal is conductive.

As the auxiliary relay RY, MY1 manufactured by OMRON Corporation is used in the illustrated example. As shown in FIG. 3, one SPDT is provided in the mini power relay RY.
The contact RY-1 and the coil CR are built in. The coil CR is connected to the SPDT contact U- of the additional level detector LS2.
It is connected to a power supply via a contact a. The a contact of the SPDT contact RY-1 in the mini power relay RY is interposed between the external input terminals T2 and T4 in the pump control panel CP. In addition, PL is a water reduction warning indicator light provided at the site, and is connected to the power supply via the b contact of the SPDT contact U-1.

According to the above configuration, the constant water level valve CV and the pressure pump P
Is normal, the water level in the receiving tank W is at the level L2.
LS2, the additional level detector LS2
The contact a of the SPDT contact U-1 is turned on, and the contact b of U-2 is turned off. Therefore, the low water warning signal S
7, the terminal T2 is maintained in an off state, and the terminal T2-T4 is also made conductive through the contact a of the contact RY-1, so that the pump recovery signal S3 is maintained in the on state.

On the other hand, when the constant water level valve CV fails or the like, the water level in the water receiving tank W is determined by the level L determined by the electrode rod E2.
2, the b contact of the SPDT contact U-2 is switched from off to on, and the low water warning signal S7
Is turned on. Then, the logical OR operation of the water reduction warning signal S7 and the drought warning signal S6 is performed by the external output terminals B5 and BC.
As a result, the content of the drought warning signal S5 sent to the warning receiver (not shown) is turned on before the actual drought state is reached, and the drought warning signal is sent to the monitoring center via the alarm receiver (not shown). Is sent. Therefore, the time required for the technician to arrive at the site can be secured by automatically detecting the situation leading to the water outage and automatically informing the monitoring center via the telephone line or the like. In the state where the water reduction warning signal S7 is turned on, the contact a of the SPDT contact U-1 is turned off, the power supply to the coil CR of the relay RY is cut off, and the contact RY-1 is turned off. , Terminals T2 and T4 are made non-conductive, and the pumping pump recovery signal S3 is maintained in the off state.

On the other hand, when the constant water level valve CV is normalized and the water level in the water receiving tank W recovers to the level L2 determined by the electrode rod E2, the contact a of the SPDT contact U-1 turns on, and the auxiliary relay RY is turned on. As a result of the energization of the coil CR being restarted, the contact RY-1 is switched from the off state to the on state, and the connection between the external input terminals T2 and T4 of the pump control panel CP becomes conductive again. Then, when the switch LS1-2 is turned on, the pumping pump recovery signal S3 is transmitted from the external output terminal B3 as before. The pumping pump recovery signal S3 is supplied as a set input in a self-holding circuit for motor drive control of the pumping pump, whereby a self-holding circuit (not shown) is set, and the operation of the pumping pump P is restarted.

As described above, the control device according to the above-described embodiment includes the level detector LS1 having four electrode rods including one common electrode rod E4 and three level detection electrode rods E1 to E3. The level of the water in the water receiving tank W is detected at three levels L1, L2, and L3, and the detection output LS1 of the shortest electrode rod E1 among the three level detection electrode rods E1 to E3 is used. An alarm signal S4 is output, and the drought alarm signal S is output at the detection output LS1-31, LS32 of the longest electrode rod E3.
5 and a pumping pump idle rotation prevention signal S6, and a pumping pump recovery signal S3 at the detection output LS1-2 of the intermediate length electrode rod E2. By disconnecting the intermediate length level detecting electrode rod E2 from the level detector LS1 and connecting it to a newly added level detector LS2, the detection output U-2 of the additional level detector LS2 is obtained. Generates a water reduction warning signal S7, and in response to the detection output U-1 of the additional level detector LS2, the intermediate length electrode terminal T2 of the existing level detector LS1.
Control means (for example, an auxiliary relay RY) for forcibly conducting / non-conducting between the power supply and the common electrode terminal T4.
Is provided, the recovery signal S3 of the pressure pump is generated as before with the intermediate length detection output LS1-2 of the existing level detector LS1.

Therefore, according to this embodiment, while maintaining the existing four electrode rod configuration and the internal connection configuration of the pump control panel CP as before, the level switch LS2 having the two electrode rod configuration and By simply adding the simple configuration of adding the auxiliary relay RY, it is possible to secure a sufficient time from the issuance of the water reduction warning signal S7 to the interruption of the water supply, and to prevent the engineer from reaching the water interruption before arriving at the site. Can be prevented.

In addition, the water reduction warning signal S7 output from the additional level detector LS2 and the existing level detector LS
The drought warning signal S5 output from 1 is sent to an alarm receiver (not shown) after being logically ORed with each other.
There is no need to add a new signal line between the pump control panel CP and the alarm receiving panel (not shown). Therefore, when a new building or condominium management order is received and the management method is changed from individual resident management to remote centralized management, there is no new financial burden on the customer side, and remote centralized management is not required. Even after switching, if an abnormality occurs in the water supply system for any reason, it is possible to avoid water interruption as much as possible, and in the event of water interruption, it will be possible to recover this early. This is extremely effective from the viewpoint of maintaining or improving customer service.

[0040]

As is apparent from the above description, according to the present invention, while maintaining the existing configuration of the electrode rods and the like and the wiring configuration, etc. as much as possible, slight additions of parts and changes in the circuit are made. In this way, it is possible to secure enough time from issuing the low water warning to the water cutoff, and to prevent the water shortage before the engineer (repair staff) arrives at the site,
It becomes very suitable for water supply equipment management of condominiums etc. by remote centralized monitoring.

[Brief description of the drawings]

FIG. 1 is a diagram showing an example of level setting in a four-electrode bar system according to the present invention.

FIG. 2 is a diagram showing a system configuration of the entire control device of the present invention.

FIG. 3 is a diagram showing an internal connection of an auxiliary relay used in the present invention.

FIG. 4 is a diagram showing internal connections of a pump control panel of the present invention.

FIG. 5 is a diagram showing an example of level setting in a conventional four-electrode bar system.

FIG. 6 is a diagram showing a system configuration of an entire conventional control device.

FIG. 7 is a diagram showing an internal connection of a conventional pump control panel.

FIG. 8 is a diagram showing an example of level setting in a conventional five-electrode rod system.

[Explanation of symbols]

E1, E2, E3 Level detection electrode rod E4 Common electrode serving as ground L1, L2, L3 Three-stage detection level CB 4-core cable CCB 5-core cable LS1 Existing level detector LS2 Additional level detector CP pump Control panel RY Auxiliary relay T1 to T4 External input terminal of pump control panel B1 to B5, BC External output terminal of pump control panel S3 Pumping pump recovery signal S4 Fullness warning signal S5 Drought warning signal S6 Pumping pump idling prevention signal S7 Water reduction warning signal LS1-1, LS1-2, LS1-31, 32 Three built-in switches of existing level detectors (contacts) PL Low water warning indicator light U-1, U-2 Built-in switches of additional level detectors (contacts) P Pressure pump CV Constant water level valve W Reception tank

Claims (3)

[Claims] 1. A water level in a water receiving tank is detected in three stages using a level detector having four electrode rods comprising one common electrode rod and three level detection electrode rods, Among the three electrode rods for level detection, the detection output of the shortest electrode rod outputs a full-water warning signal, the detection output of the longest electrode rod outputs a drought warning signal and a pumping pump idle rotation prevention signal, and an intermediate length. In the control device of the pressurized water supply type water supply equipment which is configured to generate a pumping pump recovery signal at the detection output of the electrode rod of the length, while disconnecting the electrode rod for level detection of the intermediate length from the level detector, this By connecting to a newly added level detector, a water reduction warning signal is generated at the detection output of the additional level detector, and the existing level is detected in response to the detection output of the additional level detector. Of the detector By providing inter-electrode conduction control means for forcibly conducting / non-conducting between the inter-length electrode terminal and the common electrode terminal, the pressure pump is restored as before with the intermediate length detection output of the existing level detector A control device for a pressurized water supply type water supply system, wherein the control device is configured to generate a signal. 2. The interelectrode continuity control means, the contact of which is interposed between an intermediate length electrode terminal and a common electrode terminal of an existing level detector, and is driven by a detection output of an additional level detector. 2. The method according to claim 1, further comprising an auxiliary relay.
2. The control device for a pressurized water supply type water supply system according to item 1. 3. The pressurized water supply type as claimed in claim 1, wherein a drought warning signal transmission terminal of an additional level detector is connected in parallel to a drought warning signal transmission terminal of the existing level detector. Water supply equipment control device.