JPH0842993A - Removing and preventing device for scale - Google Patents

Abstract

PURPOSE:To permit the effective removing and prevention of scale by a method wherein a solenoid type coil for generating a magnetic field for acting on liquid to be treated is arranged around the outside of a pipe, from which scale is to be removed, to impress an magnetizing signal, whose frequency is changed continuously. CONSTITUTION:Both terminals of a coil 3, consisting of a covered copper wire wound around the periphery of a pipe 2, from which scale is to be removed, are connected to the signal output terminals 5, 6 of a controller 4 and excitation is started, then, a magnetizing signal, generated in a saw tooth oscillating circuit in the controller 4 and controlled so as to have the frequency of 700-3000Hz, for example, is impressed on the coil 3. According to this method, a magnetic field is generated and liquid, flowing in the pipe, receives a Lorentz force. The Lorentz force moves in the field and electrify the liquid whereby the particles of the liquid are provided with a directional property, then, calcium ion or magnesium ion in the liquid is deposited whereby the deposite can be collected by a filter placed in the flow of the liquid, for example.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a device for treating a liquid for the purpose of preventing or removing scale, and has at least one solenoid coil for generating a magnetic field acting on the liquid to be treated. And a control device connected to both ends of the coil and having at least one output signal for exciting the coil with an excitation signal.

[0002]

BACKGROUND OF THE INVENTION Calcium sulphate, calcium silicate and sulphate are present because even small percentages of impurities such as calcium and magnesium ions in liquids such as water will result in the formation of scales and large amounts of precipitates. Magnesium produces scale. This is because the liquid in which this formation reaction occurs evaporates, the concentration of these salts increases, approaches the saturation point for crystallization, and adheres to the wall. Calcium carbonate, for example, produces very soft scales or sometimes precipitates. The most durable form of scale is calcium sulphate. Since calcium sulfate adheres to metal walls such as pipes and boilers very strongly, it is necessary to stop using these pipes and boilers and remove the scale.

If, for example, scale occurs in a steam boiler, in addition to the possibility of blockage of the pipe, heat exchange is reduced, so that fuel consumption is increased. A scale layer of about 0.2 mm can also partially overheat and damage the boiler.

The calcium and magnesium ions as well as all manganese, iron and aluminum impurities are also harmful for domestic use. Because these substances react with soaps to form insoluble calcium, magnesium, iron and aluminum salts, so that sticky substances on the material to be washed can be placed in water containing these impurities. This is because it is generated.

As is already known, charges moving in a magnetic field undergo Lorentz force. The Lorentz force is proportional to the strength of the magnetic field, the amount of electric charge, the moving speed of electric charge, and the direction of the magnetic force line with respect to the electric charge moving direction. If a liquid contaminated by the above elements enters a magnetic field, the liquid molecules, such as water molecules, become directional. As a result, said impurities, in particular calcium and magnesium ions, can be precipitated out of solution and trapped, for example by means of an aged filter in the liquid stream. As a result, no scale is generated. This known device comprises a solenoidal coil, but the liquid to be treated must be incorporated into the pipe system in order to pass through the interior space of the coil to which direct current, fixed frequency alternating current or pulsed current is applied. Therefore, in order to install the device, the operation of the pipe system currently in use must be stopped,
There was a similar problem in terms of operation such as maintenance after installation, such as replacing the device.

[0006]

SUMMARY OF THE INVENTION The present invention has been made under the above-mentioned background, and does not require a structure which has to be incorporated in a pipe through which a liquid to be treated flows, and operates over a target liquid flow range of the liquid to be treated. It is an object of the present invention to provide a device that efficiently and sufficiently achieves the above.

[0007]

To achieve the above object, the scale removing / preventing apparatus of the present invention comprises at least one solenoid-like coil for generating a magnetic field acting on a liquid to be treated, and the coil. A control device having at least one signal output connected to both ends of the coil, the coil having a connection end excited by an excitation signal generated by the control device, and continuous without depending on the flow rate of the liquid to be treated. It is characterized in that the control device includes a generation unit for generating an excitation signal whose frequency changes.

The generating means includes control input means for changing the amplitude of the excitation signal, and the at least one converter means for generating the control signal depending on the flow rate of the liquid to be treated is the liquid to be treated. It may be connected to the control input means for the purpose of changing the amplitude of the excitation signal in inverse proportion to the flow rate.

Further, the coil may have a winding axis in the longitudinal direction, and a protective sleeve for arranging the coil so that the winding axis is parallel to the pipe through which the liquid to be treated flows may be provided.

The coil further comprises a housing, at least one solenoid coil for generating a magnetic field acting on the liquid to be treated, and a controller having at least one signal output connected to both ends of the coil. When,
The control device may be housed in the housing, and the housing may be provided with fixing means for fixing the housing along a longitudinal direction of an outer surface of the pipe.

[0011]

According to the above construction, when the coil arranged outside the pipe is connected to the control device and the excitation signal generated by the control device is applied to the coil, a magnetic field is generated and the generated magnetic field flows in the pipe. Gives Lorentz force to liquid.

Further, since the converter means detects the flow rate of the liquid to be treated and generates the control signal, the amplitude of the excitation signal changes in inverse proportion to the flow rate.

Since the coil is provided with the protective sleeve, when the protective sleeve is arranged parallel to the pipe, the coil is arranged parallel to the pipe.

Further, since the coil and the control device are housed inside the housing, when the housing is fixed to the pipe, the coil is arranged parallel to the pipe.

[0015]

Embodiments of the present invention will be described below with reference to the drawings.

In FIG. 1, reference numeral 1 denotes a scale prevention / removal device. This scale removal / prevention device 1 is a solenoid coil 3 in which a conductor wire such as an insulated copper wire is wound around an outer circumference of a pipe 2. And the control device 4, and the coil 3 is connected to the signal output terminals 5 and 6 of the control device 4. Further, a transducer 9 for detecting the flow rate of the liquid flowing in the pipe 2 is connected to the control signal input terminals 7 and 8 of the control device 4, and an exciting current is applied to the coil 3 in the control device 4. There is provided an indicator lamp 10 indicating that the operation is being performed.

An insulating material 11 such as a polyester sheet may be attached around the pipe 2 in order to ensure the insulation between the pipe 2 and the coil 3.

FIG. 2 shows the configuration of the control device 4, in which the voltage controlled oscillator 12 has a driver 1 having signal output terminals 5 and 6.
3 is connected. The frequency of the voltage controlled oscillator 12 is controlled by the sawtooth wave oscillation circuit 14. It has been found that an excitation signal that varies steadily in the frequency range between 700 and 3000 HZ has the desired effect on almost all fluids that are possible in real life.

The control unit 15 having the control signal input terminals 7 and 8 for supplying the control signal from the transducer 9 in order to change the frequency and the amplitude of the AC signal generated by the voltage controlled oscillator 12. Is provided. The transducer 9 may be a general flow meter incorporated in a fluid, or an ultrasonic flow rate detection sensor, which is arranged outside the pipe and generates a flow rate state as an output signal.

The control unit 15 receives a signal from the transducer 9 so that if the liquid flow rate increases, the voltage controlled oscillator 12
Alternatively, the amplitude of the output signal of the driver 13 is reduced, and the amplitude of the output signal of the voltage controlled oscillator 12 or the driver 13 is increased when the liquid flow rate decreases.

Further, an indicator lamp 10 composed of a light emitting diode which is lit while the current is supplied to the coil 3 through the signal output terminals 5 and 6 is connected to the driver 13 and the operating state of the apparatus is voiced. The speaker 16 for confirmation is connected to the driver 13. The speaker 16 is provided so as to generate a warning sound when no current flows through the signal output terminals 5 and 6 during operation of the device, for example, when the coil 3 is broken. Reference numeral 17 is a DC power supply circuit for converting from an AC power supply into a DC power for operating the scale removing / preventing device 1, but this DC power supply circuit 17 is a battery when the AC power cannot be supplied because of the installation location. Alternatively, it may be configured by a DCDC converter that converts a solar cell or the like into a required voltage.

Removal of scale constructed as described above
The prevention device 1 includes a coil 3 having a coated copper wire wound around a pipe 2, and a signal output terminal 5 of a control device 4 at both ends of a coil 3.
After connecting to 6, turn on the switch and supply power,
When an excitation signal controlled to 700 to 3000 HZ is generated by the sawtooth oscillation circuit 14 and applied to the coil, a magnetic field is generated and the liquid flowing in the pipe receives the Lorentz force. This Lorentz force acts on the electric charge that moves in the magnetic field as described above, so when the liquid enters the magnetic field, the liquid molecules have directionality and the calcium and magnesium ions in the liquid precipitate, For example, it can be captured by a filter placed in the liquid stream.

When the transducer 8 is connected to the control device 4, the transducer 8 detects the flow rate of the liquid flowing in the pipe 2 and inputs the detected flow rate to the control section 15 as a control signal. In accordance with the flow rate of the liquid flowing through the pipe 2, the processing 15 is performed so that the amplitude of the excitation signal decreases when the liquid flow rate increases and the amplitude increases when the liquid flow rate decreases. As a result, the product of the amplitude of the excitation signal and the flow rate of the liquid can be kept constant, and the optimum effect can be obtained.

FIG. 3 shows a state in which the two coils 3a and 3b are used. The coils 3a and 3b are connected in series to the signal output terminals 5 and 6, and the winding directions are opposite to each other. Therefore, a magnetic field in the opposite direction is generated. In the vicinity of the virtual division plane a indicated by the dotted line, the magnetic force lines of the two magnetic fields are, for example, the coils 3 a and 3 which face each other apart from the division plane a.
It can be clearly seen that it is oriented in a direction that traverses the pipe 2 more than the magnetic lines of force at both ends with b. Therefore, the liquid molecules can undergo a larger Lorentz effect in the vicinity of the dividing surface a, and the effect of scale prevention / removal can be increased.

Next, FIG. 4 shows the coil 3 with the protective sleeve 18
The protective sleeve 18 may be installed so as to be parallel to the pipe 2 as shown in FIG. It is possible to prevent corrosion due to electrolytic corrosion between the coil metal such as copper and the pipe 2 formed of metal such as cast iron when the insulator of the wire is damaged.

Further, FIG. 5 shows a state in which the control unit 4 and the coil 3 are integrally housed in the housing 19, and in order to strengthen the magnetic field generated by the coil 3, the coil 3 is
May be wound around the magnetic core 20 formed of a magnetic material such as soft iron or ferrite. The coil 3 has the housing 19
Is attached to the pipe 2 by a suitable method so that the winding axis is parallel to the pipe 2 in the longitudinal direction of the coil 3.
Held in. A pipe clip for directly fixing the housing 19 and a fixing band (not shown) are attached to the housing 19. By this,
By fixing the housing 18 to the pipe 2, the fluid flowing in the pipe 2 can be treated, so that it is not necessary to wind the coil 3 around the pipe 2 and the installation can be facilitated.

[0027]

According to the first aspect of the present invention, the pipe can be easily installed outside the pipe without disconnecting the existing pipe through which the liquid to be treated flows. Furthermore, the frequency of the excitation signal of the coil is changed to generate a magnetic field capable of obtaining a time-satisfactory average effect for various flow rates, so that scale removal / prevention can be effectively performed. .

According to the second aspect of the present invention, since the flow rate of the liquid in the pipe is detected and the amplitude of the excitation signal is changed, the magnetic field can be made stronger as the liquid flow rate decreases and weakened as the liquid flow rate increases. It is possible to provide an effective scale removing / preventing device. Furthermore, since it is not necessary to change the set value in accordance with the change in the liquid flow rate, it is possible to provide a scale removing / preventing device which is efficient in terms of operation management, without the need for manpower.

According to the invention of claim 3, the coil 3 is wound inside the protective sleeve to simplify the installation, and when the insulator of the winding is damaged, the coil metal such as copper and the metal such as cast iron are used. Corrosion due to electrolytic corrosion between the formed pipe 2 can be prevented.

According to the invention of claim 4, since the coil and the control device are integrally arranged in the housing, it is not necessary to wind the coil around the pipe, and the installation can be facilitated.

[Brief description of drawings]

FIG. 1 is a perspective view showing the configuration of a scale removal / prevention device.

FIG. 2 is a block diagram showing an electrical configuration of the scale removing / preventing device.

FIG. 3 is an explanatory view of an embodiment showing another embodiment.

FIG. 4 is an embodiment explanatory view showing an embodiment in which a coil is arranged in a protective sleeve.

FIG. 5 is an embodiment explanatory view showing an embodiment in which a coil and a control device are housed in a housing.

[Explanation of symbols]

 1 Scale removal / prevention device 2 Pipe 3 Coil 4 Controller 12 Voltage controlled oscillator

Claims (4)

[Claims] 1. A device for treating a liquid for the purpose of removing scale adhered to the inside of a pipe or preventing adhesion of the scale, which is arranged outside the pipe to generate a magnetic field acting on the liquid to be treated. Of at least one solenoid coil, and a controller having at least one signal output connected to both ends of the coil, the coil having a connection end excited by an excitation signal generated by the controller. A scale removing means characterized in that the control device is provided with generating means for generating an excitation signal whose frequency continuously changes without depending on the flow rate of the liquid to be treated.
Prevention device. 2. The generation means includes control input means for changing the amplitude of the excitation signal, and the control input means changes the amplitude of the excitation signal in inverse proportion to the flow rate of the treatment liquid. 2. Scale removal and prevention device according to claim 1, characterized in that it is connected to at least one converter means for producing a flow-dependent control signal. 3. The coil has a longitudinal winding axis, and the coil includes a protective sleeve for arranging the winding axis so that the winding axis is parallel to a pipe through which a liquid to be treated flows. The scale removing / preventing device according to claim 1, wherein: 4. An apparatus for treating a liquid for the purpose of preventing or removing scale adhesion, comprising a housing and at least one solenoid-shaped coil for generating a magnetic field acting on the liquid to be treated, A controller having at least one signal output connected to both ends of the coil, the coil and the controller being arranged in the housing, and the housing fixing the housing along a longitudinal direction of an outer surface of the pipe. A scale removal / prevention device characterized by having fixing means.