JPH0914148A - Operation control system for pump - Google Patents

Abstract

PURPOSE: To provide an operation control system for a pump to accurately announce an abnormal state when the operation state of the pump is abnormal and rapidly disconnect the feed of a power to a pump by the power source side and simply and safely take a necessary countermeasure. CONSTITUTION: An abnormal signal coupling means 4 to which a pump 3 is connected through a power line 2 connected to a commercial AC source 1 and which detects the abnormal operation state of the pump 3 and transmits an abnormal signal to a power line 2 and effects overlap conveyance is arranged on the pump 3 side. Further, an operation control means 5 coupled to the power line 2 and receiving an abnormal signal and disconnecting the feed of a power to the pump 3 from a power source is arranged between the power source 1 and the power line 2. When the pump 3 is in an abnormal operation state, the feed of a power from the power source 1 to the pump 3 is disconnected according to an abnormal signal.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a case where a fluid machine such as a pump, a fan, a blower, etc. (hereinafter referred to as "pump" as a representative) connected to a commercial AC power source through an electric power line is in an abnormal operating state. The present invention relates to a pump operation control system for stopping the operation of a pump by cutting off the supply of electric power to the pump.

[0002]

2. Description of the Related Art The operating state of a pump connected to a power line changes due to a change in water level, clogging of a suction port, wear or failure of a motor, or the like. Therefore, the operating conditions of these pumps are constantly monitored, and in the event of abnormal operating conditions such as when the water level drops or the motor fails,
Therefore, it is necessary to take prompt and optimal measures.

For this purpose, for example, an overcurrent detection breaker is provided between the power line connected to the pump and the commercial AC power supply, and the power supply is shut off in the case of an abnormality such as an overload of the pump. The method is widely used.
However, in general, the accuracy of overcurrent detection is not very good, and there is a problem such that the inrush current having a transiently high current peak value that occurs when the pump is started is erroneously determined as an overcurrent. easy. For this reason, the dead zone for overcurrent detection is generally set higher with a certain margin. However, even if a large amount of current corresponding to the dead zone limit flows, it will not be detected as an abnormal operating state and power will continue to be supplied. I can't.

In recent years, an inverter drive type pump for controlling the operation of the pump by an inverter is increasing. In such an inverter drive type pump, the output of the inverter is stopped in an abnormal operation state such as an overload to automatically stop the operation of the motor to prevent damage to the pump. However, in such an inverter-driven pump, even if the output of the inverter is stopped and the operation of the motor is automatically stopped, power is continuously supplied from the power line to the inverter itself, so it is possible that the power supply side is in an abnormal operation state. It cannot be sensed, and since power is being supplied to the power line, it is dangerous even if corrective measures are taken.

Regarding these problems, for example, according to Japanese Patent Laid-Open No. 59-582, in the case of a submersible pump which is submerged in water, it is extremely difficult to detect the operating state of the submerged portion. An optical fiber that connects the submerged part and a detection machine on the surface of the water is provided along the power line so that the state related to the submerged part can be accurately detected.

[0006]

However, according to the above-mentioned prior art, when the pump is in an abnormal operating state, it is necessary to know the abnormal situation accurately and to take an appropriate countermeasure promptly. Nevertheless, for example, the above-described overcurrent detection cannot accurately grasp the abnormal operating state, and in some cases, even if a large amount of current flows, it is not possible to appropriately take measures such as cutting off the power supply. In addition, an inverter-driven pump is dangerous because electric power continues to be supplied to the power line even when the output of the inverter is cut off, and an abnormal operating state of the pump cannot be detected on the power supply side. Further, there have been various problems such that the abnormal operation state monitoring by the optical fiber requires a complicated structure such as a special power line along the optical fiber and an optical-electrical signal converter.

The present invention has been made in view of the above-mentioned circumstances, and when the operating state of the pump is abnormal, the power source side is accurately notified of the abnormal state, and the power source side promptly supplies power to the pump. It is an object of the present invention to provide an operation control system for a pump, which can be shut off and take necessary countermeasures simply and safely.

[0008]

In order to achieve the above object, in the pump operation control system of the present invention, the pump is connected through a power line connected to a commercial AC power source,
Supplying electric power from the power source to the pump by detecting an abnormal operating state of the pump and transmitting an abnormal signal to the power line to superimpose the abnormal signal on the pump side, and connecting the power line to receive the abnormal signal. Is provided between the power source and the power line to shut off the power supply from the power source to the pump in response to the abnormal signal when the pump is in an abnormal operating state. Is.

Further, the pump may be a submersible pump driven by an inverter which receives power from a power line.

Further, the abnormal signal coupling means may be provided with an overload detection means for generating an abnormal signal when the pump load becomes overloaded. .

Furthermore, the abnormal signal coupling means includes:
Light load detection means may be provided for generating an abnormal signal when the load of the pump becomes light.

[0012]

According to the present invention, the abnormal signal for detecting the abnormal operating state of the pump is conveyed by being superposed on the power line by the abnormal signal coupling means and received by the operation control means provided between the commercial AC power source and the power line. The operation control means is operated to cut off the supply of electric power from the power source to the pump. Further, the abnormal signal is generated from the overload detection means when the load of the pump is overloaded,
It can also be superposed on the power line by the abnormal signal coupling means. Furthermore, the abnormal signal may be generated from the light load detection means and superposed on the power line by the abnormal signal coupling means when the load of the pump becomes light.

[0013]

Embodiments of the present invention will be described below with reference to the drawings. In the following description of the embodiments, the same elements will be denoted by the same reference symbols, without redundant description. FIG.
FIG. 1 is a block diagram showing a configuration of a first embodiment of a pump operation control system of the present invention.

The operation control system for a pump according to this embodiment includes a power line 2 connected to a commercial AC power source 1 and a power line 2.
A pump 3 connected to the
Abnormal signal coupling means 4 including transmission coupling means 41 for coupling to
Is provided between the power source 1 and the power line 2, and the operation control means 5 including the receiving coupling means 51 coupled to the power line 2 and the power cutoff means 52 as internal devices is provided.

The pump 3, the abnormality signal coupling means 4, and the operation control means 5 are electrically connected to the commercial power source 1 to be supplied with power.

In the pump operation control system configured as described above, while the pump 3 is in the normal operation state, no abnormal signal is generated from the abnormal signal coupling means 4 and no abnormal signal is transmitted to the power line 2. . The operation control means 5 also receives no abnormal signal. Therefore, the operation control means 5 leaves the power cutoff means 52 in the closed state, and the commercial power supply 1 is supplied to the pump 3 via the power line 2.

However, when the pump 3 is in an abnormal operating state such as an overload, it is detected by an abnormal operating state detecting means (not shown) included in the abnormal signal connecting means 4 that the abnormal operating state is detected, and the abnormal signal connecting is performed. The abnormal signal is transmitted from the means 4 to the power line 2 via the transmission coupling means 41, and the abnormal signal is conveyed to the power supply side via the power line 2. The abnormal signal that is superposed on the power line 2 and conveyed is taken out from the power line 2 by the reception coupling means 51 of the operation control means 5, and the operation control means 5 receives the abnormal signal and opens the power cutoff means 52,
The supply of the commercial power supply 1 to the power line 2 is cut off. As a result, it is possible to prevent the pump and the motor from operating for a long time in the abnormal operation state, and the pump and the motor are not unnecessarily damaged.

FIG. 2 is a schematic view of the essential parts showing the configuration of the second embodiment of the present invention. The pump 3 is a submersible pump installed in the deep well 6, and is constructed integrally with the pump. It is driven by the inverter 31. Further, the pump 3 has a clogging detection sensor 3 as overload detection means.
2 and a water level sensor 33 as a light load detecting means. Further, the operation control means 5 is provided with a buzzer 53 as an abnormality warning means.

According to the pump operation control system configured as shown in FIG. 2, for example, when the suction port is clogged as an example of the overload of the pump, the inverter 31
The internal overcurrent detection function and overload detection function are activated to stop the output of the inverter 31 and protect the damage of the inverter 31 and the motor. At this time, the inverter 31 stops its operation, so that no overcurrent or abnormal current is generated in the power line 2. Therefore, the circuit breaker (not shown) on the commercial power source 1 side does not disconnect the circuit, and power is continuously supplied from the commercial power source 1 to the power line 2. However, according to the configuration of this embodiment, the clogging sensor 32 detects that the vehicle is in an abnormal operation state, the abnormal signal coupling means 4 transmits an abnormal signal to the power line 2, and the operation control means 5 causes the power supply cutoff means 52.
Is opened, and the supply of the commercial power supply 1 to the power line 2 is cut off. Further, the buzzer 53 attached to the operation control means 5 can inform surrounding workers that the operating state of the pump 3 is abnormal. Further, since electric power is not supplied to the electric power line 2, it is extremely safe even when an operator confirms an abnormality of the pump.

Further, according to the configuration of the second embodiment, the water level sensor 33 of the pump 3 detects that the water level is abnormally abnormal, and the abnormal signal coupling means 4 detects the abnormal condition. The signal is transmitted on the power line 2. As a result, the sound of the buzzer 53 of the operation control means 5 allows the surrounding workers to know that the water level of the pump 3 is abnormal.

In the above description of the embodiment, the clogging detection sensor is used as the overload detection means.
It is also possible to use a temperature sensor that detects an abnormal rise in the motor winding temperature due to overload or overcurrent, or a temperature sensor that detects an abnormal rise in bearing temperature due to overcurrent, overload, or wear. Although the water level sensor has been taken as an example of the light load detection means, the motor rotation speed increases as the load becomes lighter. Therefore, a means for detecting the light load by performing current detection according to the rotation speed is used. You can also

Further, as the abnormal signal, it is possible to use an abnormal signal for detecting the insulation deterioration of the winding due to the water immersion from the change of the impedance due to the change of the dielectric constant of the oil chamber and the change of the oil amount. Also, an abnormal signal that detects an open phase abnormality of the inverter from the current change accompanying the torque change, or
It is also possible to use an abnormal signal for detecting the reverse rotation of the motor to detect a reverse phase abnormality, and also an abnormal signal due to leakage detection.

Also, although it has been explained as if there is only one type of abnormal signal, the modulation of the abnormal signal is changed according to the mode of the abnormal operating state to send various information as the abnormal signal, or It is needless to say that the configurations of the transmission coupling signal and the reception coupling means can be changed accordingly.

Furthermore, the operation control means is provided with a power supply means for disconnection which is connected to a backup power source or a commercial AC power source in a separate circuit, and the operation is performed even when the connection from the commercial AC power source to the power line is interrupted by an abnormal signal. It is also possible to keep the continuous display or the continuous notification by the control means.

[0025]

As described above, the pump operation control system of the present invention is provided between the commercial AC power source and the power line by transmitting the abnormal signal for detecting the abnormal operating state of the pump by superimposing it on the power line. The operation control means receives the abnormal signal superimposed on the power line, and operates the operation control means to cut off the supply of electric power from the power source to the pump. Therefore, the operating state of the pump can be accurately notified to the power supply side, the power supply to the pump can be quickly shut off at the power supply side when an abnormal operating state occurs, and the necessary measures can be taken safely. There is a remarkable effect of being able to provide a simple operation control system. In particular, when the present invention is applied to a submersible pump, it is possible to detect an abnormal state even if the pump is not pulled out of the water, even if the operating state is abnormal such as a decrease in the water level or the pump is clogged. effective.

[Brief description of the drawings]

FIG. 1 is a block diagram showing a configuration of a first embodiment of a pump operation control system of the present invention.

FIG. 2 is a main part configuration diagram showing a configuration of a second embodiment of the present invention.

[Explanation of symbols]

 1 Commercial Power Supply 2 Power Line 3 Pump 4 Abnormal Signal Coupling Means 5 Operation Control Means

Claims (4)

[Claims] 1. An abnormal signal coupling means for connecting a pump via a power line connected to a commercial AC power source, detecting an abnormal operating state of the pump, transmitting an abnormal signal to the power line, and carrying the signals in an overlapping manner on the pump side. Provided between the power supply and the power line is operation control means for connecting the power line to receive an abnormal signal and shutting off the supply of electric power from the power supply to the pump. A pump operation control system, characterized in that the supply of electric power from the power source to the pump is cut off in accordance with the above. 2. The pump operation control system according to claim 1, wherein the pump is a submersible pump driven by an inverter that receives power from a power line. 3. The pump according to claim 1, wherein the abnormal signal coupling means is provided with an overload detection means for generating an abnormal signal when the load of the pump is overloaded. Driving control system. 4. The pump according to claim 1, wherein the abnormal signal coupling means is provided with a light load detection means for generating an abnormal signal when the load of the pump becomes a light load. Driving control system.