JPS6130607B2 - - Google Patents

Description

[Detailed Description of the Invention] [Industrial Application Field] The present invention relates to an electromagnetic overflow device, and is an electromagnetic overflow device that is designed to enhance the safety function of preventing trapped solid matter from flowing out due to loss of magnetic field due to coil power cutoff, etc. It is related to.

[Conventional technology]

Figure 1 shows a schematic system of the filtration device, including a filtration device in which the stock solution is passed through a container and passed through an overlayer in the container, and the system around the filtration device.

Here, if the processing capacity of the raw solution is large and it is necessary to perform continuous over-operation, it is common to install multiple partial-capacity units in parallel, including a spare filter tower. The case of two series will be explained. 1a and 1b are overboards. The stock solution is transferred from the inlet pipe 11 to the a series filter inlet pipe 12a,
After passing through the inlet valve 13a and being overtreated in the strainer 1a, it passes through the outlet pipe 15a and the outlet valve 16a. Similarly, in the b series, the inlet pipe 12b, the inlet valve 13b,
It separates from the treated liquid through the filter 1b, the outlet pipe 15b, and the outlet valve 16b, and reaches the outlet pipe 18. Bypass pipes 19 and 21 and a bypass valve 20 are provided as a filter bypass line between the inlet pipe 11 and the outlet pipe 18, and the bypass valve 20 is closed during overtreatment operation. As the filter units 1a and 1b pass through the liquid flow treatment operation, the pressure difference in the overlayer increases or the quality of the treated water deteriorates, so it is necessary to wash the overlayer by backwashing. During this backwashing, the inlet valves 13, 13b and outlet valves 16a, 16b of the filter unit are closed to isolate the filter unit, and backwash water or air is passed through the pipe 22 and valve 24 to the filter unit 1a, 1b, and the clogged superlayer is washed by the backwash flow. Drainage after cleaning is done through valve 26.
a, 26b and pipes 27a, 27b to the outside of the device.

The backwashing operation begins with isolation of filter units 1a and 1b,
Since backwashing and the start of water flow to the filter are carried out according to a fixed operating procedure, sequential automatic operation is generally performed, and the filter inlet and outlet valves 13a, 1
3b, 16a, 16b and other related valves are automatically operated valves, such as motor-driven or pneumatically operated valves.

Next, the system configuration when using an electromagnetic filter as the overflow device is as follows: The types of overflow devices 1a and 1b in Fig. 1 are simply replaced with the electromagnetic overflow device, and the inlet side of the raw solution,
The main systems such as the outlet side and backwash-related systems are designed based on the same basic policy as in the case of using a general filter unit as shown in Figure 1, and there are no problems during normal liquid flow operation or backwash operation. There isn't.

As the cross section of the electromagnetic device 1 is shown in Fig. 2,
Magnetic undissolved solids in the stock solution are captured by the magnetic packing 7 which is placed in the magnetic field generated by the coil 102 connected to the power source 103. The opening of the magnetic filler 7 is much larger than the particle size of the solid material, and is not a mechanical problem. Therefore, during backwashing, by stopping the power supply to the coil 102 and demagnetizing the magnetic filler 7, it is possible to obtain a backwashing effect with a small amount of backwashing flow and within an extremely short time of about a few seconds. It has become its biggest feature.

[Problem that the invention seeks to solve]

Conversely, if an emergency situation occurs that causes the magnetic field in the overheater 1 to disappear, such as a loss of coil power in a part of the device, the solid matter trapped in the magnetic filler 7 will be temporarily removed. This has the potential to leak into the downstream system, which is one of the major drawbacks. There are various possible applications for the electromagnetic filter 1, but for example, in power plants such as thermal power plants and nuclear power plants, it is used as a prefilter installed upstream of a desalination device in a condensate system. Applications include installations downstream of water supply systems such as boilers or reactor inlets. In the former case, if the aforementioned trapped solids flow out, some of them will be recaptured in the ion exchange resin layer in the desalination equipment installed later;
In the latter case, it will flow directly into the boiler or reactor, which will have a serious impact.

Therefore, it is essential to establish protection technology against such primary accidents and improve reliability when applying electromagnetic overload devices.

SUMMARY OF THE INVENTION An object of the present invention is to provide an electromagnetic flux device that takes measures to prevent solid matter trapped in a magnetic filling from separating in the event of a loss of magnetic field within the electromagnetic flux device.

[Means for solving problems]

The above problem is solved by dividing the electromagnetic coil into a plurality of parts, detecting an abnormality in each of the divided coils, and using a signal from the abnormality detection circuit to cut off the power supply to the divided coil in which the abnormality is occurring. This is solved by

[Effect]

According to the above configuration, disconnection occurs in the divided coils.
If an accident such as a short circuit occurs, the abnormality is detected by the abnormality detection means and only the abnormal coil is disconnected from the power supply, so the electromagnetic overflow device can continue operating with the remaining normal coils. Although the magnetic field of the coil becomes slightly weaker, operation can be continued without detaching the adsorbed solids.

〔Example〕

An embodiment of the present invention will be described below with reference to FIG.

Divided electromagnetic coil 102a of the electromagnetic device
The power supply bus 103 that is supplied to
105a, 106b, 107 as in the a power supply system rectified from the AC power supply consisting of the diode a.
A multi-source system is used, which consists of three types of power supplies: a power system b, which is composed of the power supply system b, 108b, a battery 110, and a contactor 111, and is designed to prevent loss of power due to an abnormality in the power supply system. The electromagnetic coil is divided into 102a to 102e, and each coil is short-circuited.
Overcurrent, high coil temperature, and power loss caused by a ground fault are detected by abnormality detection circuits 113a to 113e, respectively, and the outputs of the abnormality detection circuits are used to trigger switches 112a to 112e inserted in series in the corresponding electromagnetic coils. It is configured to open the circuit.

In this embodiment, the power supply bus 103 is constantly supplied with power from a battery 110 in addition to the two power supply systems A and B rectified from the AC power supply, thereby reducing the influence of failures in the power supply systems. The coils 102a to 102e are each divided from the power supply bus.
are the power supply lines 104a to 104e and the switch 11, respectively.
Power is supplied via 2a to 2e.

When a short-circuit accident occurs in the coil 102a, the abnormality detection circuit 113a detects the coil overcurrent, generates an abnormal signal, and opens the switch 112a. Since the remaining coils 102b to 102e are normal, the strength of the magnetic field acting on the magnetic filling 7 will be slightly weaker because these coils continue to be supplied with power, but the attracted foreign matter will not flow downstream. The magnetic field does not drop enough to cause an outflow, allowing continued operation.

The example shown in Fig. 4 is a two-line system with a normal system and a standby system as overflow devices, and the switching pattern to the standby system is changed depending on the degree of failure in the normal system, and adsorption to the downstream side is performed. This shows a system that minimizes the outflow of foreign matter. In other words, if the failure that occurs in the regular system is so minor that the adsorbed foreign matter will not flow out even if the system continues to operate, set up the backup device, continue operation until the backup system is fully activated, and then The switching pattern is such that the regular system is stopped for repair, and if the malfunction of the regular system is so severe that the adsorbed object will come off if the system continues to operate,
It is now possible to automatically select a switching pattern in which the bypass is opened, the regular system is stopped immediately, and the bypass is closed after waiting for the standby system to start up.

In the embodiment shown in FIG. 4, the electromagnetic overload device 1a is a regular device and 1b is a spare device, each coil is divided and switches A112a to e, B112a to
It is connected to a power supply bus (not shown) via e. The coils A102a to 102e of the regular appliance are each provided with an abnormality detection circuit, and the signals from each abnormality detection circuit operate to open the switches A112a to 112e corresponding to the respective coils. When the switches A112a to A112e are opened, the determination circuit 109 receives the signal. The determination circuit 109 determines the degree of failure in the regular appliance 1a, and in the embodiment shown in FIG. In the event of a failure, a signal 32 indicating that continued operation is not possible is issued.

This determination indicates the limit to which the foreign matter adsorbed by the regular device will flow out. In this example, if three split coils fail, the adsorbed foreign matter will no longer flow out if the device is continued to operate.

Next, the switching operation will be explained.

When operating with common use device 1a, common use device coil A102
When a failure occurs in any one of a to e, the power to the coil detected by the abnormality detection circuit is opened by the power switches 112a to 112e, and the failed coil is disconnected from the power. At the same time, a judgment circuit 10 makes a judgment based on the number of opened power switches.
In step 9, it is determined whether or not continued operation is possible.

If the number of open switches is 2 or less, it is determined that operation can be continued, and a coil abnormality alarm is generated while the service unit 1a remains in operation.
After issuing a switching command 31 to the reserve unit 1b and fully opening the reserve unit inlet valve 13b, the electromagnetic coil power supply B112a
~ e is input, and after a certain period of time, the solenoid valve 33 is energized,
The filter outlet valve 16b is fully opened to put the reserve device 1b into operation, and then the outlet valve 16a of the regular device 1a is fully closed, the inlet valve 13a is fully closed, and the reserve device 1 is turned on.
b.

In this switching pattern, since failures in the regular unit are minor, the regular unit 1a continues to operate until the standby unit 1b starts up, thereby minimizing fluctuations in the flow rate applied to the downstream side of the over-unit.

If the judgment circuit 109 determines that continued operation is impossible, the switching command 32 causes the solenoid valve 3 to
5 is energized to fully open the excess device bypass valve 20, and when the excess device bypass valve is not fully open, the solenoid valve 34 is energized and the excess device outlet valve 16a is fully closed by switching command 32 to prevent the flow of adsorbed foreign matter and perform bypass operation. The unit continues to operate as follows. Subsequently, the reserve filter inlet valve 13b is fully opened, the switches B112a to 112e are turned on, and after a certain period of time, the filter outlet valve 16b is fully opened, the reserve filter 20 is fully closed, and a series of operations are performed to achieve steady operation, and bypass operation is started. Measures to minimize contamination of the unit. The above operation is expressed in a block diagram as shown in FIG.

In addition, FIG. 6 shows a modification of the embodiment shown in FIG. 3. In this system, the electromagnetic coil of the overloader is divided, and the corresponding power source is not provided in a busbar configuration, but is provided independently. The configuration and functions are as follows. 105a circuit breaker, 106a contactor, 107a transformer,
The rectified alternating current formed by the diode 108a is supplied to the electromagnetic coil 102a.

The electromagnetic coil 102b has a similar configuration.
The electromagnetic coil 102c is supplied with multiple power from a battery 110 through a contactor 106c, and any abnormality in the electromagnetic coil is detected by abnormality detection circuits 113a to 113c. Contactor 106a compatible with the coil
~c is opened.

According to the present invention, a slight failure of the coil of the electromagnetic overload device eliminates the loss of the coil power supply and the total magnetic field in the overloader, and prevents the solid matter trapped in the magnetic filling inside the overloader from flowing out. can.

[Brief explanation of the drawing]

Fig. 1 is a system diagram showing the system configuration of the electromagnetic converter, Fig. 2 is a sectional view showing the structure of the electromagnetic converter, Fig. 3,
FIG. 4, FIG. 5, and FIG. 6 are explanatory diagrams of an electromagnetic overflow device having a multiple power supply configuration. 1a, 1b...Electromagnetic device, 7...Magnetic filling, 13a, 13b...Device inlet valve, 16a,
16b...supercharger outlet valve, 20...supercharger bypass valve, 102a-e...electromagnetic coil, 103...
Power busbar, 105... Breaker, 106... Contactor, 107... Transformer, 108... Diode,
109...Judgment circuit, 110...Battery, 1
DESCRIPTION OF SYMBOLS 11... Contactor, 112a-e... Electromagnetic coil switch, 113a-c... Abnormality detection circuit.

Claims (1)

[Claims] 1 Electromagnetic overflow that magnetizes the material filled inside the container using the magnetic force generated by energizing an electromagnetic coil installed on the outer periphery of the container, and removes magnetic solids from the stock solution introduced from the container entrance. In the device, the electromagnetic coil is divided into a plurality of pieces, each divided coil is connected to a power supply via a switch, and an abnormality detection circuit is provided for each divided coil, and an abnormality is detected by the output of the abnormality detection circuit. Open the switch corresponding to the coil where .
An electromagnetic overflow device characterized by being disconnected from a power source.