JPH03156191A - Motor pump with abnormality detecting function - Google Patents

Abstract

PURPOSE:To prevent a motor pump and pump circuit system from accidents by detecting the rotational frequency of the pump through a rotation detector and comparing it with that of an abnormal reference pump to detect early the abnormalities in the pump and pump circuit. CONSTITUTION:A motor pump 10 is piped connectively to a tank 20 filled with predetermined solution. When a pump circuit for circulating the solution through a filter 21 is used and any abnormality takes place, the rotational frequency N of the pump is detected to be compared with the inputted rotational frequencies R1-R7 of an abnormal reference pump, so that abnormalities in the pump, pump circuit system, etc., can be surely detected and coped with. For example, if the rotational frequency N of the pump is reduced lower than R1 and the pump is judged to be under the locked condition, the pump is immediately stopped, disassembled and converted to be coped with. Also, if the rotational frequency of the pump is increased higher than R5 and a filter is judged to be loaded, a motor driving part is cotrollably reversed by changing over current for a rotation detector of a Hall element for example to reverse the pump for a certain time by a timer so that the loading of the filter can be automatically released.

Description

DETAILED DESCRIPTION OF THE INVENTION Field of the Invention The present invention relates to an electric pump with an abnormality detection function, and more particularly to an electric pump with an abnormality detection function that can diagnose abnormalities in the pump and pump circuit system.

2. Description of the Related Art Conventionally, as a circuit for using an electric pump such as a magnet pump, as shown in FIG. We are also supplying the products to the department.

When the filter 4 becomes clogged, the flow rate decreases, so the flow switch 3 detects the decrease in the flow rate, sends a signal to an external monitoring unit, and takes measures such as stopping the electric pump 2. ing.

Problems to be Solved by the Invention However, various abnormalities in pumps and pump circuits can occur, such as the above-mentioned filter clogging, pump locking due to dirt getting caught in the pump, overloading, and clogging at the blades. .

Therefore, it is important to accurately and early detect these abnormal conditions, but this problem has not yet been solved in the past.

Means for Solving the Problems The present invention has been made in view of the above points, and in order to solve the above problems, the number of revolutions of an electric pump can be freely detected via a rotation detector such as a Hall element. In addition, abnormal reference pump rotation speeds such as minimum rotation speed, overload rotation speed, filter clogging rotation speed, and motor step-out rotation speed are set based on the pump characteristic curve, and the above rotations are detected when the pump is operating. To provide an electric pump with an abnormality detection function, characterized in that an abnormality in the pump or pump circuit system can be detected by comparing the pump rotational speed detected from the pump with the abnormality reference pump rotational speed.

According to the present invention, the rotation speed of the electric pump is detected by a rotation detector and compared with the abnormal reference pump rotation speed to detect an abnormal state, thereby accurately detecting abnormalities in the pump or the pump circuit system. It can be detected by Hayatomo.

Example Hereinafter, the present invention will be explained based on examples.

1 to 5 show one embodiment of the present invention, which was implemented in a Madonet pump. The electric pump 10, which is a magnetic pump, is integrally formed into a cylindrical shape using a synthetic resin material or the like that fluidly partitions a pump 13 in which a pump blade part 11 and a pump drive part 12 are integrally combined, as shown in FIG. It is formed so as to be attached to the motor drive section 14. Then, a field section 15, which is a stator installed inside the motor drive section 14, applies a field to a magnet material 16 embedded in the pump drive section 12, thereby driving the pump 13 to rotate. 17 is the pump suction port, 1
8 is a pump discharge port.

The field section 15 of the motor drive section 14 is connected to the circuit so as to generate a rotating magnetic field in the direction of driving the DC motor. A detector 19 is installed inside. and,
This rotation detector 19 detects the rotation state of the pump drive unit 12, and a digital converter (not shown) is connected to the rotation detector 19.
etc., to detect the rotational speed of the pump 13.

The pump characteristics of the electric pump 1O described above are as shown in FIGS. 2 and 3 in normal conditions, such as a flow rate/head curve and a flow rate/pump rotation speed curve. Regarding the electric pump 10 of this magnet pump and the circuit used for the pump, when the pump rotation speed deviates from the normal rotation speed region of the pump characteristic curve as shown in the following table, the pump and pump circuit system will be adjusted according to the degree of deviation. It is possible to detect abnormalities in

Therefore, these abnormal reference pump rotation speeds R1, R2,
Input R3, R4, 115, R6, and R7 to a microcomputer (not shown) or controller (not shown), and set the pump rotation speed N detected by the rotation detector I9 as shown in Fig. 4. It is formed so as to be compared so that a signal can be transmitted to a pump abnormality display section (not shown) or an external monitoring section.

When the electric pump 10 configured as described above is connected to a tank 20 filled with a predetermined solution by piping as shown in FIG. If this occurs, the pump rotation speed N is detected as shown in Fig. 4, and the abnormal reference pump rotation speed R1, R
2. By comparing R3, R4, R5, R6, and R7, abnormalities in the pump, pump circuit system, etc. can be accurately detected and dealt with.

For example, if the pump rotational speed N falls below R1 and the pump is found to be in a locked state, the pump can be immediately stopped, disassembled, or converted.

In addition, if the pump rotation speed N rises above R5 and it is determined that the filter is clogged, the motor drive unit is controlled to rotate in reverse by switching the current of the Hall element rotation detector, etc., and the pump is rotated in reverse for a certain period of time using a timer. can automatically unclog the filter.

Even with a single-phase motor, the pump can be easily controlled in reverse as described above because the motor drive section is of a direct current type. Further, since filter clogging can be detected by the pump rotation speed N, there is no need to provide a flow switch or the like in the pump circuit as shown in FIG. 5, and the number of parts can be reduced and pump efficiency can be improved.

If abnormal conditions of the pump can be detected accurately in this manner, it is possible to respond appropriately to the abnormal conditions, and if spare parts are prepared in advance, recovery measures can be taken at an early stage on site.

In the above embodiment, the pump circuit is described as a circulation circuit, but the present invention is also applicable to other known and publicly used pump circuits.

In the example, the pump drive unit was directly driven by the motor drive unit, but it can also be applied to magnet pumps and other electric pumps that are driven by magnetic coupling via a motor rotor. .

Effects of the Invention As described above, in the present invention, the pump rotation speed can be detected through the rotation detector and compared with the abnormal reference pump rotation speed, and abnormalities in the pump or pump circuit can be detected at an early stage. This makes it possible to prevent accidents involving electric pumps and pump circuit systems.

[Brief explanation of the drawing]

FIG. 1 is a side cross-sectional view of an electric pump which is a magnet pump according to an embodiment of the present invention, FIGS. 2 and 3 are characteristic diagrams of the same pump, respectively, and FIG. FIG. 5 is a pump circuit diagram using the same electric pump as above, and FIG. 6 is a pump circuit diagram using a conventional electric pump. 10... electric pump, 13... pump, 14...
Motor drive unit, 19... rotation detector.

Claims (1)

[Claims] (1) The rotation speed of the electric pump can be freely detected via a rotation detector such as a Hall element, and the minimum rotation speed, overload rotation speed, and filter clogging rotation speed are determined based on the pump characteristic curve. , set an abnormality reference pump rotational speed such as motor step-out rotational speed, and compare the pump rotational speed detected by the rotation detector and the abnormality reference pump rotational speed when the pump is operating to detect abnormalities in the pump or pump circuit system. An electric pump with an abnormality detection function that is designed to be detectable.