JPH0711282Y2 - Electrode steam generator - Google Patents

Description

[Detailed Description of the Invention] (Industrial field of application) The present invention, when the steam generating electrode connected to each phase of the three-phase AC power source is immersed in water in the steam generating cylinder and the steam generating electrode is energized, The present invention relates to an electrode-type steam generator that generates steam by heating water itself.

(Prior Art) FIG. 3 shows the structure and piping of a steam generation cylinder in a conventional electrode-type steam generation device, wherein 1 is a steam generation cylinder (hereinafter referred to as “cylinder”) for storing water, and 2 ₁ to 2
₁₂ to each phase of the steam generating electrode 12 which is furnished to the cylinder 1 (hereinafter referred to as "electrode") in which such electrodes 2 ₁ to 2 ₁₂ each three-phase AC power source 3 (hereinafter referred to as "Power 3") They are connected in parallel via the power unit 4 (see FIG. 4). Reference numeral 5 denotes a water level detection electrode (hereinafter referred to as “detection electrode”) installed at a predetermined height of the cylinder 1, and this detection electrode 5 is connected in parallel to the third phase of the power source 3 via the control unit 6 ( (See FIG. 4). Reference numeral 7 is a water supply main provided with a water stopper 8, a filter 9 and a flow controller 10, and 11 is a normally closed solenoid valve for water supply provided in the water supply main 7 (hereinafter referred to as "water supply valve 11").
The opening / closing of the water supply valve 11 is controlled by the control unit 6 (see FIG. 4). 12 is a steam supply port in the upper part of the cylinder 1 for keeping the internal pressure of the cylinder 1 at atmospheric pressure.
A water receiver provided at a position higher than 1a, 13 is a port for attaching / detaching the water supply / drainage port 1b at the lower part of the cylinder 1, a port for connecting to the water receiver 12 via the water supply pipe 14, and a port for connecting the drainage pipe 15. Water supply / drainage branch pipe (hereinafter referred to as “branch pipe”) provided with 16 and 16 is a normally closed solenoid valve for drainage (hereinafter referred to as “drain valve”) provided in the drain pipe 15.
The opening / closing of the drain valve 16 is controlled by the control unit 6 (see FIG. 4). 17 is a drain pipe for preventing the water in the water receiver 12 from overflowing, 18 is a drain main pipe for discharging the water discharged from the drain pipe 15 or 17 to the outside of the apparatus, and 19 is a steam distributor provided on the upper part of the cylinder 1. The steam distributor 19 is connected to the steam supply port 1a of the cylinder 1 via the hose 20. Reference numeral 21 denotes a plurality of steam supply hoses connected to the steam distributor 19, and the steam generated in the cylinder 1 is supplied through the hose 20, the steam distributor 19 and the steam supply hose 21.
Further, water generated by the dew condensation on the steam distributor 19 and the steam supply hose 21 is returned to the cylinder 1 through the water supply pipe 14.

FIG. 4 shows the structure of a control circuit of a conventional electrode type steam generator, and those having the same reference numerals as those in FIG. 3 show the same parts, and 22 is a three-phase power supply line 23 (hereinafter "Power line 2
3 ”) power switch, 24 _{1 to} 24 ₄ are power line 2
Three-phase branch lines branched from three to four (hereinafter referred to as “branch lines”), and electrodes 2 ₁ to 2 ₁₂ are connected to the respective phases of these branch lines 24 _{1 to} 24 ₄ . 25 fuses provided to each phase of the branch line 24 _{1-24 4,} 26 ₁ to 26 ₄ triac, the semiconductor relay having a thyristor or the like (hereinafter referred to as "relay"), relay 26 ₁ branches Connect each phase of line 24 ₁ , relay 26 _{2 to} each phase of branch line 24 ₂ , relay 26 _{3 to} each phase of branch line 24 ₃ and relay 26 ₄ to each phase of branch line 24 _4. There is. 27 is, for example, 4 to 24 A, depending on the set humidity.
Humidity controller that outputs a DC current in the range of, 28, by the pulse width control method, according to the output current amount of the humidity controller 27, the output time or the output wave number of the constant frequency AC signal that is output in each cycle That is, it is a proportional circuit in which the duty ratio of the AC signal changes, and the gate terminals of the relays 26 _{1 to} 26 ₄ are connected to the proportional circuit 28. Reference numeral 29 is a water level detection circuit (hereinafter referred to as “detection circuit”) connected to the detection electrode 5. In this detection circuit 29, the detection electrode 5 is immersed in water, and the electrodes 2 ₁ , 2 ₂ , 2 ₄ , 2, _{5 5} ,
And conduction between the 2 _7, 2 _8, 2 ₁₀ and 2 ₁₁ and the detecting electrode 5, is energized in the water, and outputs a detection signal. 30 is a branch line 24 _1-2
4 Current detection coil that detects the current amount of ₄ (hereinafter referred to as "coil")
That is, the coil 30 is provided so as to intersect the branch lines 24 _{1 to} 24 ₄ . 31 is a current setting plug consisting of a resistor (hereinafter referred to as "plug"), 32 is a detection circuit 29, a coil 30 and a plug 31 connected to an input terminal, and a water supply / drainage control in which a water supply valve 11 and a drain valve 16 are connected to an output terminal. In the circuit, if the detection circuit 29 does not output a detection signal, the water supply / drainage control circuit 32 outputs a water supply signal to open the water supply valve 11, and the coil 30
When the amount of current of the branch lines 24 _{1 to} 24 ₄ detected in (1) exceeds the amount of current flowing through the plug 31 (hereinafter referred to as “reference current amount”), a drain signal is output for a predetermined time and the drain valve 16 is opened. 33 is
This is a power transformer that transforms from 200V to 24V, and this power transformer 33 serves as a power source for the control unit 6.

The power unit 4 is composed of four relays 26 _{1 to} 26 ₄ ,
The control unit 6 comprises a humidity controller 27, a proportional circuit 28, a detection circuit 29, a coil 30, a plug 31, and a water supply / drainage control circuit 32.

In the conventional example thus configured, when the power switch 22 is turned on when the cylinder 1 is empty, the humidity controller 27
The relays 26 _{1 to} 26 ₄ are electrically connected periodically or continuously in accordance with the humidity set in, but since the electrodes 2 ₁ to 2 ₁₂ are not electrically connected, none of them generate heat and the cylinder 1 is not fired. .

Also, when the cylinder 1 is empty, the electrodes 2 ₁ , 2 ₂ , 2 ₄ , 2 ₅ , 2, ₇ 2,
There is no conduction between ₈ , 2, ₁₀ and 2 ₁₁ and the detection electrode 5, and the detection circuit
Since the detection signal is not output from 29, the water supply / drainage control circuit 32
Outputs a water supply signal. Then, the water supply valve 11 is opened, but the drainage valve 16 is still closed.
Is supplied to the cylinder 1 through the water supply pipe 14 and the branch pipe 13. Then, the water level in the cylinder 1 rises, and the electrode
When 2 _{1 to} 2 ₁₂ are immersed in water and the electrode 5 is immersed in water, the electrode 2
_{Since the} electrical connection is established between ₁ , 2, ₂ , 2, ₄ , ₅ , ₅ , 2, ₇ , 2, ₈ , ₁₀ and ₂₁₁ and the detection electrode 5, and a detection signal is output from the detection circuit 29, the water supply / drainage control circuit 32 Stops outputting the water supply signal. Then,
The water supply valve 11 is closed, water supply to the cylinder 1 is stopped, and the water level in the cylinder 1 does not rise above a predetermined height.

During this time, when the electrodes 2 _{1 to} 2 ₁₂ are immersed in water and the electrodes 2 ₁ to 2 ₁₂ are electrically connected, an AC signal having a duty ratio corresponding to the humidity set in the humidity controller 27 is output from the proportional circuit 28. hand,
Since the relays 26 _{1 to} 26 ₄ are intermittently or continuously conducted for a time corresponding to the duty ratio of the AC signal, the water is heated by Joule heat to generate steam. Also, if the humidity set in the humidity controller 27 is changed during heating of water, the duty ratio of the AC signal output from the proportional circuit 28 changes, and the conduction time of the relays 26 _{1 to} 26 ₄ also changes. The amount of electric energy supplied to water changes, and the amount of steam generated increases or decreases.

By the way, when the steam is continuously generated, the water level in the cylinder 1 is gradually lowered and the detection electrode 5 is exposed to the air. Therefore, the electrodes 2 ₁ , 2 ₂ , 2, ₄ , ₄ , ₅ 2, ₂₇ , ₂₈ , between 2 ₁₀ and 2 ₁₁ and the detection electrode 5 becomes nonconductive, the detection signal from the detection circuit 29 is not outputted. Then, the water supply / drainage control circuit 32 re-outputs the water supply signal, opens the water supply valve 11 and replenishes water to the cylinder 1. However, when the detection electrode 5 is submerged in water, as described above, the detection circuit
Since the output of the detection signal from 29 is stopped and the water supply valve 11 is closed, the supply of water to the cylinder 1 is stopped. After that, every time the water level in the cylinder 1 drops below a predetermined height, the water supply valve 11 is opened and closed to replenish the cylinder 1 with water.

By the way, while repeatedly supplying water to the cylinder 1,
If you continue to supply steam, the components such as minerals contained in water will gradually be concentrated, and the electrical conductivity of water will increase.
The current amount of the branch lines 24 _{1 to} 24 ₄ gradually increases. However, when the current amount of the branch lines 24 _{1 to} 24 ₄ detected by the coil 30 exceeds the reference current amount, the water supply / drainage control circuit 32 outputs a drainage signal for a predetermined time and opens the drainage valve 16, so that the cylinder The water in 1 is discharged by a predetermined amount. However, when the water in the cylinder 1 is discharged by a predetermined amount, the detection electrode 5 is exposed from the water and the water supply / drainage control circuit 32 outputs the water supply signal as described above, so that the water supply valve 11 is opened. , Supply water to cylinder 1. Then, when the water level reaches a predetermined height and the detection electrode 5 is immersed in water, the water supply valve 11 is closed as described above, and the supply of water to the cylinder 1 is stopped.

When the current amount of the branch lines 24 _{1 to} 24 ₄ detected by the coil 30 exceeds the reference current amount, the drainage amount of the branch lines 24 _{1 to} 24 ₄ when the water is replenished to a predetermined height after drainage is If the current amount is adjusted to about 80% of the reference current amount, the thermal efficiency will not decrease so much.

Also, the maximum amount of steam generated can be changed by changing the resistance value of the plug 31.
If the reference current amount is increased / decreased, the current amount of the branch lines 24 _{1 to} 24 ₄ is also increased / decreased and changed.

(Problems to be solved by the invention) By the way, when the humidity set in the humidity controller 27 is 0%, the relays 26 _{1 to} 26 ₄ become non-conductive, and the electrodes 2 ₁ , 2 ₂ , 2, _{4 4} , 2
_Since there is also no electrical connection between ₅ , 2, ₇ , 2, ₈ , ₁₀ and ₂₁₁ and the detection electrode 5, even if the detection electrode 5 is immersed in water, that is, reaches a predetermined height, the detection circuit 29 Is not energized, and the detection circuit 29 does not output a detection signal. Therefore, the water supply / drainage control circuit 32 continues to output the water supply signal and holds the water supply valve 11 in the open state, so that water overflows from the cylinder 1, in other words, the water supply control to the cylinder 1 becomes impossible. There was a problem.

The present invention has been made in view of this problem, and an object thereof is to provide an electrode-type steam generator capable of reliably controlling water supply to a cylinder even when the humidity set in a humidity controller is 0%. There is.

(Means for Solving the Problem) In order to achieve the above-mentioned object, the present invention provides a semiconductor relay with a first phase and a third phase of a three-phase power line or a first phase and a third phase of a three-phase branch line. It is only connected to the phase.

(Operation) When the humidity set in the humidity controller is 0%, the semiconductor relays connected to the first and third phases of the three-phase power supply line or the first and third phases of the three-phase branch line become non-conductive. Even so, if the water level detection electrode is immersed in water, between the steam generation electrode and the water level detection electrode connected to the second phase of the three-phase power line to which the semiconductor relay is not connected or the second phase of the three-phase branch line And the water supply solenoid valve is closed, so that water can be reliably prevented from overflowing from the steam generation cylinder.

Embodiment An embodiment of the present invention will be described in detail below with reference to the drawings.

The first figure shows a configuration of an embodiment of the present invention, those of Figure 3 and Figure 4 reference characters the same shows the same parts, and, 34 ₁ to 34 ₈ triac (registered Trademark), a thyristor, etc. semiconductor relay (hereinafter referred to as "relay"). The relay 34 ₁ is connected to the first phase of the branch line 24 ₁ and the relay 34 ₂
Is for the third phase of branch line 24 ₁ and relay 34 ₃ is for the first phase of branch line 24 ₂ .
The phases, the relay 34 ₄ in the third phase of the branch lines 24 _2, relay 34 ₅ in the first phase of the branch line 24 _3, relay 34 ₆ in the third phase of the branch lines 24 _3, relay 34 ₇ branched the first phase line 24 _4, relay 34 ₈ are respectively connected to the third phase of the branch line 24 _4, also relay 34 ₁ -
The gate terminal 34 ₈ is connected to the output terminal of the proportional circuit 28.

The power unit 4 is composed of _eight relays 34 _{1 to} 34 ₈ .

In the present embodiment having such a configuration, the branch lines 24 21 _to
No semiconductor relay is provided in the second phase of 4 ₄
Humidity 0% set to humidity control, with relay 34 _{1-34 8} nonconductive, even electrodes 2 ₁ to 2 ₁₂ becomes non-conductive, if the detection electrode 5 indulge in water, the electrode 2 _2, 2 _5, 2 ₈ and 2 ₁₁ and by conduction between the detection electrode 5, always energizing the detecting circuit 29. Therefore, if the water level in the cylinder 1 rises and the detection electrode 5 is immersed in water, the detection circuit 29 outputs a detection signal and stops the output of the water supply signal from the water supply / drainage control circuit 32. When the water level in 1 reaches a predetermined height, the water supply valve 11 is closed to prevent water from overflowing the cylinder 1 regardless of whether the humidity set in the humidity controller is 0% or not. To do.

FIG. 2 shows the configuration of another embodiment of the present invention.
The same symbols as those in FIG. 4 and FIG. 4 indicate the same parts, and the power unit 4 is connected to the relay 26 ₁ connected to each phase of the branch line 24 ₁ and each phase of the branch line 24 ₂ . Relay 26 ₂
And the relay 26 ₃ connected to each phase of the branch line 24 ₃ and the branch line 24 _3
The relays 34 ₇ connected to the first phase of ₄ and the relays 34 ₈ connected to the third phase of the branch line 24 ₄ are composed of the relays 26 ₁ to 26.
_3, 34 ₇ and 34 ₈ gate terminals are connected to a proportional circuit 28.

In this embodiment having such a configuration, since the semiconductor relay is not provided in the second phase of the branch line 24 ₄ , the humidity set in the humidity controller is 0% and the relays 26 _{1 to} 26 ₃ and 34 are provided. ₇ and 34 ₈ are non-conductive, even when the electrodes 2 ₁ to 2 ₁₂ nonconductive, the detection electrode 5 if indulge in water and conduction between the electrodes 2 ₁₁ and the detecting electrode 5, the detection circuit 29 Be sure to energize. Therefore, when the water level in the cylinder 1 rises and the detection electrode 5 is immersed in water, the detection circuit 29 outputs a detection signal and the water supply / drainage control circuit.
Since the output of the water supply signal from 32 is stopped, when the water level in the cylinder 1 reaches a predetermined height, the water supply valve 11 operates regardless of whether or not the humidity set in the humidity controller is 0%. Close to prevent water from overflowing cylinder 1.

In the embodiment of the present invention, by branching the supply line 23 into four, it has been described in example for heating the water in the cylinder 1 at twelve electrodes 2 ₁ to 2 _12, the power supply line 23 3n (where n is the number of branches, where n ≧ 3) by branching the power supply line 23 into two or more by three steam generating electrodes directly connected to
The water in the cylinder 1 may be heated by the steam generating electrode of 2).

(Effects of the Invention) As described above, according to the present invention, even if the humidity set in the humidity controller is 0% and the vapor generation electrodes are not electrically connected, if the water level detection electrode is immersed in water. , Since the water supply solenoid valve is closed because the steam generation electrode connected to the second phase of the three-phase power supply line or the second phase of the three-phase branch line and the water level detection electrode are electrically connected, water flows from the steam generation cylinder. This has the effect of reliably preventing overflow.

[Brief description of drawings]

FIG. 1 is a circuit diagram of a power unit according to an embodiment of the present invention, FIG. 2 is a circuit diagram of a power unit according to another embodiment of the present invention, and FIG. 3 is a steam generation cylinder in a conventional electrode-type steam generator. And FIG. 4 is a control circuit diagram of a conventional electrode-type vapor generator. 1 ...... steam generating cylinder, 2 ₁ to 2 ₁₂ ...... steam generator electrode,
3 ... Three-phase AC power supply, 5 ... Water level detection electrode, 11 ... Water supply solenoid valve, 23 ... Three-phase power supply line, 24 _{1 to} 24 ₄ ... Three-phase branch line, 26 _{1 to} 26 ₄ ... Semiconductor relay, 27 ... Humidity controller, 34
_{1 to} 34 ₈ …… Semiconductor relay.

Claims (1)

[Scope of utility model registration request] 1. A steam generator electrode connected to each phase of a three-phase power supply line from a three-phase AC power supply or to each phase of a three-phase branch line branched from the three-phase power supply line into water in a steam generation cylinder. In the electrode-type steam generator, the water is heated to generate steam when the steam generating electrode is energized by supplying electricity to the water in an amount corresponding to the humidity set in the humidity controller. As described above, the semiconductor relay for controlling the power supply to the vapor generating electrode is connected only to the first and third phases of the three-phase power line or the first and third phases of the three-phase branch line. However, even if the semiconductor relay becomes non-conductive, if the water level detection electrode provided at a predetermined height in the steam generation cylinder and the steam generation electrode are immersed in water, the semiconductor relay is not connected. The second phase of the three-phase power line or the three-phase Wherein said steam generating electrode connected to the second phase of 岐線 by conduction between the water level detecting electrode, the electrode steam generator feed water solenoid valve has to close to control the water supply to the steam cylinder.