JPH0612327Y2 - Steam generator - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION <Industrial field of application> The present invention relates to an electrothermal steam generator.

<Prior art and its problems> As this kind of electric heating type steam generator, for example, Japanese Patent Publication No. 60-5
Although there is a device described in Japanese Patent No. 1265, in these conventional devices, regarding arrangement and control of an electric heater for heating,
It was not particularly considered in relation to scales and scales generated in the steam generating can.

On the other hand, as a method for treating scales and scales generated in the steam generating can, a method of charging a plurality of balls for crushing scales into the can is known. The ball collides with the scales and scales and crushes the scales into small pieces. As a result, the scales do not clog the drainage channel or drain valve.

However, according to the consideration of the present inventors, in the case where the electric heater is provided only on the outer bottom surface of the steam generating can body, the side peripheral surface of the steam generating can body becomes a non-heating surface, and the inner wall of the scale or scale is removed. However, there was a drawback that the peeling was not performed sufficiently.

Also, if an electric heater is provided only on the outer circumference of the steam generating can body, the balls for crushing scales do not move sufficiently, and the scale and scales crushing effect deteriorates. There was a drawback that it was not possible to sufficiently prevent clogging of.

Furthermore, even if electric heaters are provided on both the outer bottom surface and the outer circumference of the steam generating can body, as long as the temperature is adjusted by turning on and off the electric heaters, the inactivity of the ball movement when the electric heaters are off, scale, and scale There was a defect of poor peeling from the inner wall of the can.

Therefore, an object of the present invention is to provide a steam generator which eliminates the above-mentioned conventional drawbacks, can favorably treat scales and scales, has a simple structure, and can keep costs low.

<Means for Solving the Problems> In order to achieve the above object, the steam generator of the present invention includes a side electric heater on the outer periphery of the steam generating can body and a bottom electric heater on the outer bottom surface of the steam generating can body. In addition to installing the plurality of balls for crushing scale stones in the steam generating can, and keeping both the side electric heater and the bottom electric heater in an energized state while the apparatus is operating, and only the side electric heater is provided. It is characterized in that the temperature is adjusted by adjusting the voltage.

<Operation> According to the features of the present invention, since the bottom electric heater is always energized during operation, it is possible to keep the movement of the scale crushing ball active. That is, crushing of scales and scales is performed well.

In addition, since the energization of the side electric heater is not stopped during operation, the peeling action of scales and scales from the inner wall of the can is not stopped.

Since the side electric heater is provided separately from the bottom electric heater so that the voltage can be independently adjusted, the temperature of the can body can be controlled to a predetermined temperature by lowering the voltage of the side electric heater when the temperature exceeds a predetermined temperature. . In this case, since the temperature is adjusted by the side electric heater, the bottom heater does not need to reduce the voltage, and active ball movement can be secured.

Further, since the electric heater is repeatedly turned on and off, the durability is improved.

<Embodiment> FIG. 1 is a perspective view showing an embodiment of the present invention, FIG. 2 is a sectional view showing the same embodiment, FIG. 3 is an electric circuit diagram of the same embodiment, and FIG. It is a chart.

Water is put in the steam generating can body 10 and heated to become steam, which is then transported. A side electric heater 21 is provided on the outer circumference 11 of the can body 10.
In addition, a bottom electric heater 22 is provided on the outer bottom surface 12 of the can body 10 separately from the above. Further, with respect to the can body 10, a water inlet pipe 31,
The drain pipe 32 and the steam transfer pipe 33 are connected to each pipe 31, 32, 33.
Electromagnetic on-off valves 34, 35, 36 are provided in each. These valves
34, 35, 36 are automatically controlled by the control unit 40. Inside the can body 10, a plurality of scale stone crushing balls 50 are loaded.

The side electric heater 21 and the bottom electric heater 22 form a circuit as shown in FIG. I.e. power supply, for example 200
A main heater switch 23 is provided for the V AC power source, and the main heater switch 23 is
When turned on by the control unit 40, the bottom electric heater 22 is set to 200
When it is V, it is energized. This voltage then gives a secondary voltage to the side electric heater 21 via the transformer 24. The side electric heater 21 is controlled by the voltage changeover switch 25, for example, 200V and 100V.
Switched to V. That is, the temperature of the can 10 is measured by a temperature sensor (not shown), and when this temperature becomes equal to or higher than a predetermined temperature, the switch 25 is turned on by the control unit 40.
The 0V side terminal 26 is switched to the 100V terminal 27.

Referring to FIG. 4, when the operation of the apparatus is started right now, after confirming that water is contained in the can body 10, the main heater switch 23 is turned on, whereby the side electric heater 21 and The bottom electric heater 22 starts heating at 200V. When the temperature of the can body 10 (either the temperature of the can body 10 itself, the temperature of the water in the can body 10 or the ambient temperature in the can body 10 is used) is at a predetermined temperature, temperature control by the control unit 40 is started, The voltage changeover switch 25 is changed over. As a result, the side electric heater 21 is heated at 200V or 100V.
When the voltage is switched from 200V to 100V, the heating capacity of the heater drops to 1/4, so temperature control becomes possible. In the case of the embodiment, since the bottom electric heater 22 is constantly energized at 200 V during operation, the movement of the ball 50 can be kept active. In addition, since the side surface electric heater 21 is always kept in the energized state during operation, the peeling action of scales and scales from the inner side wall of the can body 10 is not stopped. Of course, since the heaters are not frequently turned on and off, the durability of the heaters 21 and 22 is increased.
Besides, without using expensive things such as thyristors,
The ability can be adjusted at low cost.

<Effect> The present invention is configured as described above, and according to the steam generating apparatus of claim 1, since the bottom electric heater is always energized, the scale of the scale for crushing stones is always active and the scale is small. Good crushing of stones and scales.

Further, since the side surface electric heater is always energized, the peeling action of scales and scales from the inner wall surface of the can body can be maintained well.

Therefore, it is possible to reliably prevent the scale or scale from clogging the drainage channel or the drainage valve.

Also, the temperature of the steam generating can can be adjusted by changing the voltage of the side electric heater. Of course, it is also possible to suppress deterioration of the durability of the heater due to the on / off control.

[Brief description of drawings]

FIG. 1 is a perspective view showing an embodiment of the present invention, FIG. 2 is a sectional view showing the same embodiment, FIG. 3 is an electric circuit diagram of the same embodiment, and FIG. 4 is a time showing an operation example of the same embodiment. It is a chart. 10: Steam generating can 11: Outer circumference 12: Outer bottom 21: Side electric heater 22: Bottom electric heater 50: Scale stone crushing ball

 ─────────────────────────────────────────────────── ─── Continuation of the front page (72) Shinichi Ueda, 32 Akashi-cho, Chuo-ku, Kobe-shi, Hyogo In stock company Noritsu (72) Creator Toshihiko Tokage 32 Akashi-cho, Chuo-ku, Kobe, Hyogo Stock Within Noritsu

Claims (1)

[Scope of utility model registration request] 1. A side electric heater is provided on the outer periphery of the steam generating can body, and a bottom electric heater is provided on the outer bottom surface of the steam generating can body, and a plurality of scale crushing balls are loaded in the steam generating can body. Further, during operation of the apparatus, both of the side electric heater and the bottom electric heater are kept in an energized state, and the temperature of the side electric heater is adjusted by adjusting only the voltage of the side electric heater. .