JP2889780B2 - Cleaning equipment for steam generators - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a boiling steam generator in which a water supply port and a water discharge port need to be provided separately, and to a structure used for cleaning a scale.

[0002]

2. Description of the Related Art Conventionally, a steam generator is provided with a drain port at the bottom of an evaporating tank, and a filter for preventing large-diameter scale pieces from flowing out above the drain port is disposed above the drain port. And a water supply port for supplying water was connected to the drain pipe in a T-shape. By the way, in a boiling steam generator, scale is precipitated from residual water which has been concentrated as a result of evaporation in the evaporating tank and has high hardness, and large scale pieces accumulate on the filter, which hinders drainage. In order to prevent the clogging of the scale pieces, when water is supplied from a water supply port, a water flow is blown out from a drain port to remove clogging due to the scale pieces.

[0003] However, cross connection in which tap water and waste water may be mixed is prohibited. In other words, it has been pointed out by the guidance of the Japan Water Supply Association that water supply pipes and drain pipes should not be used in water supply equipment directly.

[0004]

SUMMARY OF THE INVENTION The present invention has been made in view of the above-mentioned problems, and an object of the present invention is to eliminate the problem of the water supply law, to prevent clogging by a scale, and to further improve drainage. It is an object of the present invention to provide a steam generator cleaning device capable of draining water at a low temperature without deteriorating the drainage pipe.

[0005]

In order to achieve the above object, the present invention provides a steam generator cleaning apparatus of the boiling type,
In a steam generator provided with a drain 3 at the bottom of the evaporating tank 1 and provided with a filter 3 so that a large-diameter scale piece does not flow out from the drain 2, water is supplied near the drain 2 at the lower part of the evaporating tank 1. It is characterized in that the water supply port 4 is provided so that the water flow supplied from the water supply port 4 is directed toward the filter surface of the filter 3.

[0006]

According to the above construction, even if the drain port 2 and the water supply port 4 are provided in different piping systems so that there is no problem in the Water Supply Law,
When water is supplied from the water supply port 4, the scale pieces are blown off by the water supply pressure, so that clogging of the filter 3 can be prevented. When the hot water is drained from the drain port 2, the hot water and the low-temperature water can be mixed at the lower portion of the evaporating tank 1 and discharged at a low temperature by supplying the water from the water supply port 4, thereby preventing deterioration of the drain pipe.

[0007]

DESCRIPTION OF THE PREFERRED EMBODIMENTS In FIGS. 1 and 2, reference numeral 1 denotes an evaporating tank, and a lid 5 is attached to the upper surface. A heating heater 6 for heating and evaporating water inside the evaporation tank 1 is provided in the evaporation tank 1.
An electrode rod serving as a water level sensor 7 for detecting a water level in the inside is hung downward from the lid 5, and the lid 5 is provided with a scale inspection port 8. In the evaporating tank 1, scale precipitated from residual water (hot water) having a high hardness due to evaporation adheres to the inner wall surface of the tank and the surface of the heater 6, and peels off and sinks as scale pieces on the bottom surface. A drain port 2 is provided at a lower portion of the evaporating tank 1, and a drain pipe 9 is connected to the drain port 2,
The drainage pipe 9 is provided with an electric drainage valve 1 so that the water channel can be opened and closed.
0 is provided. At this time, if the scale directly flows into the drain pipe 9, the drain pipe 9 is clogged or the drainage electric valve 10 becomes defective. Therefore, the filter 3 is provided above the drain port 2 of the evaporation tank 1. The filter 3 is, for example, a punched metal having an opening smaller than the diameter of the pipe, and is arranged so as to have an inverted V shape.

The water supply pipe 11 is connected to the lower part of the evaporating tank 1, and the water supply port 4 provided at the tip of the water supply pipe 11 is directed to the filter 3 so that the water supply vigorously hits the filter 3 at the water supply pressure. The water supply pipe 11 is provided with an electric water supply valve 12 for opening and closing a water channel, a check valve 13, and a drain pipe 14. The water level in the evaporating tank 1 is detected by the water level sensor 7, and the water level is controlled by a drainage electric valve 10 and a water supply electric valve 12.

After steam is supplied to the evaporating tank 1 until it is full,
It is heated to a boiling state by the heater 6 and discharged from the steam pipe 15 at a vapor pressure. The concentration of calcium and the like in the water is increased by evaporation, and the scale is deposited and the evaporating tank 1
The scale pieces adhere to the inner surface of the filter and the heater 6 and peel off, and the scale pieces stay on the filter 3. In order to prevent clogging of the filter 3 due to stagnation of the scale pieces, a water flow is applied to the filter 3 from the water supply port 4 by using the water supply pressure supplied from the water supply pipe 11, and the scale pieces on the filter 3 are removed. Blow it away. Thereby, clogging of the filter 3 is removed to facilitate drainage. When the water is drained, the water is drained from the drain port 2 and at the same time the water is supplied from the water supply port 4 to mix the hot water and the low-temperature water so that the temperature of the drain water becomes 60 ° C. or less. When the temperature of the waste water is lowered, the drain pipe does not deteriorate. Further, a constant flow valve is provided on the primary side of the water supply so that the mixing state is not affected by the flow rate (flow rate) from the water supply port 4. As a position that satisfies the above conditions, it is appropriate that H is 50 mm and L is 60 mm experimentally in FIG. If the constant flow rate is 3 liters / min, the inner diameter of the water supply pipe 11 is 1
About 2 mmφ is appropriate.

[0010]

As described above, according to the present invention, a water supply port is provided near the drainage port at the lower portion of the evaporating tank, and the water supply port from the water supply port faces the filter surface of the filter. So, even if the drain port and the water supply port are separate piping so that there is no problem under the Water Supply Law, if water is supplied from the water supply port, the scale pieces can be blown off by the water supply pressure and clogging of the filter can be prevented, It can prevent obstruction of drainage, and when draining hot water from the drain,
By supplying water from the water supply port, hot water and low-temperature water can be mixed at the lower part of the evaporating tank and drained at a low temperature, thereby preventing deterioration of the drainage pipe.

[Brief description of the drawings]

FIG. 1 is a partially cutaway front view of a steam generator embodying the present invention.

FIG. 2 is a side view of the same.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 Evaporation tank 2 Drain port 3 Filter 4 Water supply port

──────────────────────────────────────────────────続 き Continued on front page (58) Field surveyed (Int. Cl. ⁶ , DB name) F22B 37/54

Claims (1)

(57) [Claims] 1. A steam generator which is a boiling type and has a drain at the bottom of an evaporating tank and a filter provided to prevent large-diameter scale pieces from flowing out from the drain. A cleaning device for a steam generator, wherein a water supply port is provided near a mouth, and a water flow supplied from the water supply port is directed to a direction in which a water flow comes into contact with a filter surface of a filter.