JPH0510503A - Steam generator - Google Patents

Abstract

PURPOSE:To improve the maintainability, safety and durability of a steam generating drum against scale deposition by making it easy to remove scale deposit on a side flange, that serves as a cover of the steam generating drum, and in a steam outlet pipe, a steam pressure lead pipe and a water feed-drain pipe that are attached on the side flange. CONSTITUTION:A steam generating drum 1 consists of a drum main body 1a and a dismountable side flange 1b that is mounted on the drum main body 1a as a cover, and a steam outlet pipe 2, a steam pressure lead pipe 3 and a water feed-drain pipe 4 are attached on the side flange 1b. A temperature sensor 10 is equipped on the side flange 1b. When the temperature sensor 10 detects an abnormal heating of the steam generating drum 1, power supply to an electric heater 5 is cut off, and the side flange 1b is dismounted to remove scale deposit in the pipes 2, 3 and 4 and on the side flange 1b.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to the construction of a steam generator used for steam bathing, humidifying air conditioning, wet drying, steamers and the like.

[0002]

2. Description of the Related Art Conventionally, a steam generator of this type, as shown in FIG. 4, has a can body 21 for boiling water to generate steam.
The electric heater 29 is wound around the outer periphery of the main body portion 21a and the side surface flange portion 2 which are watertightly sealed and detachable.
1b, a vapor discharge pipe 22 is provided in the upper space of the can body 21a, a vapor pressure derivation pipe 23 (connected to the water level sensor chamber 25) is provided in the space above the side flange 21b, and a water supply / drain pipe 24 is provided in the lower water. It is a thing. As shown in the figure, the distance l between the water surface s and the steam discharge pipe 22 or the steam pressure derivation pipe 23.
It is difficult to obtain enough ₁ and l ₂ . Then, the scale components (insoluble components such as calcium, magnesium, and silicon) in which the boiling water w is scattered and a small amount is mixed in the vapor 26
However, the steam discharge pipe 2 provided in the space above the can body 21a
The scale 27 is deposited on the entire can body 21 including the vicinity of the second steam discharge port 22a, the steam pressure derivation port 23b of the steam pressure derivation pipe 23, and the water supply / drainage port 24a of the water supply / drainage pipe 24.

When a large amount of scale 27 is deposited in this way, the can body 21 is exchanged or each of the tubes 22, 23, 2 is replaced.
In order to peel off the scale 27 of No. 4, the can body 21 is taken out of the container, and the side body flange portion 21b is removed from the can body body portion 21a.
Was removed, and maintenance of forced peeling was required.

Further, a high limit switch 28 serving as a temperature sensor is provided at the back of the can main body 21a,
The scale 27 accumulates inside and the temperature of the can gradually rises,
When the temperature exceeds the operating temperature of the high limit switch 28, the electric heater 29 is de-energized for safety protection of the can body 21.

[0005]

However, in the above-described structure of the can body 21 for steam generation, each of the pipes 22, 23, 2 is made.
Since the arrangement of 4 is different, each pipe 22, 23, 24
It is necessary to perform maintenance (forced peeling of the scale 27) every time the scale 27 is deposited. In addition, since it is difficult to perform maintenance (such as the steam discharge port 22a), it may not be reusable.

In particular, unless the scale 27 near the high limit switch 28 is peeled off, the scale 27 serves as a heat insulating material between the can body 21 and the boiling water w, and the heat of the electric heater 29 is not transferred to the boiling water w, so that the can The temperature of the body 21 itself suddenly rises,
There is also a problem that the high limit switch 28 immediately malfunctions.

Therefore, the present invention solves the above-mentioned conventional problems. Even if scale is deposited, maintenance is easy, the can body can be easily reused, and steam generation with excellent durability is achieved. The purpose is to provide a device.

[0008]

In order to achieve the above object, a can body used in a steam generator according to the present invention comprises a can body body and a flange part, and steam is discharged to a part of the flange part. A pipe, a vapor pressure derivation pipe, and a water supply / drainage pipe are arranged. Further, a temperature sensor is also provided on a part of the flange portion.

[0009]

With the above means, the steam generator of the present invention can easily and forcibly peel off the scale that adheres to and accumulates on the steam discharge pipe of the can body, the steam pressure discharge pipe, the water supply / drainage pipe, and the mounting location of the temperature sensor. In addition, the maintenance can be easily performed, the can body can be reused, and the durability is excellent.

[0010]

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

FIG. 1 shows an embodiment of the present invention. A can body 1 for closing its periphery to generate steam has an electric heater 5 as a heating source wound around the outer periphery thereof to absorb conduction heat of the electric heater 5. In this manner, the can body 1 is composed of a can body body portion 1a and a flange portion 1b forming a lid. Both 1a and 1b
As shown in FIG. 3, the watertightness is maintained by the O-ring 14 and the bolts 15 are detachably attached. The side face flange portion 1b is provided with a steam discharge pipe 2, a steam pressure discharge pipe 3 (which is connected to the water level sensor chamber 6) and a water supply / drain pipe 4, and the steam discharge pipe 2 and the steam pressure discharge pipe 3 are provided in an upper space. Further, the water supply / drainage pipes 4 are respectively arranged in the lower water. Water 7 is supplied into the can 1 via the water supply / drainage pipe 4, and enters the water to the position of the high water level sensor 6a of the water level sensor chamber 6 connected to the water supply / drainage pipe 4 and the vapor pressure derivation pipe 3. Upon receiving the signal from the high water level sensor 6a, the electric heater 5 heats, and the water 7 in the can 1 is gradually heated and boils. When the water 7 boils, steam 8 is generated and discharged to the outside of the can body 1 via the steam discharge pipe 2. When the water 7 in the can body 1 is reduced, the low water level sensor 6b in the water level sensor chamber 6 supplies the water 7 to the can body 1 via the water supply / drain pipe 4.

When the steam 8 is generated almost continuously in this way, the scale 11 is gradually attached and deposited in the vicinity of the steam discharge pipe 2 and the steam pressure lead-out pipe 3 arranged in the space above the side surface flange portion 1b. When the amount of the scale 11 accumulated increases, the tubes 2 and 3 are clogged with the scale 11,
The steam 8 is no longer discharged or the water level in the water level sensor chamber 6 becomes unstable, so that the steam generator cannot be operated normally. Therefore, in order to maintain the safety of the can body 1, a pressure safety device 9 is provided on a part of the water supply / drainage pipe 4 and a temperature sensor (a high limit switch is used on the part of the can body 1).
When the temperature exceeds a certain temperature, the electric heater 5 is stopped) 10
Attach. These pressure safety device 9 and temperature sensor 1
0 means that the whole can body 1 or each tube 2, 3, 4
It means that the scale 11 is deposited on any of the above. Therefore, the side surface flange portion 1b can be removed from the can body body portion 1a, and the scale 11 accumulated on each of the tubes 2, 3 and 4 of the side surface flange portion 1b can be easily maintained for forced peeling.

FIG. 2 shows another embodiment of the present invention in which an opening 16 is provided in the side surface flange portion 12, and the opening 16 is provided with a screw 1.
The second flange portion 13 is watertightly and detachably attached by means of 7, and the temperature sensor 10 is provided in a part of the second flange portion 13. This feature is that the side flange portion 12 is removed when the temperature sensor 10 operates before the scale is deposited on any one of the tubes 2, 3 and 4 which is the same as that shown in FIG. Without removing the second flange portion 13, inspecting the condition of adhesion / accumulation of the scale 11 on each of the pipes 2, 3, 4 and peeling off the scale 11 adhered / accumulated on the second flange portion 13 to easily perform the temperature sensor. 10 roles can be reproduced and maintenance time can be shortened.

In the temperature sensor 10 and the like, as shown in FIG. 3, the scale 11 has a large amount of deposition (the deposition thickness is large), and the scale 11 serves as a heat insulating material at a location where the temperature rises quickly, such as the water surface s. It is desirable to provide the temperature sensor 10, the temperature sensor 10b in the lower portion of the can body 1, and the temperature sensor 10a in the upper corner portion individually or independently. Then, the adhesion / deposition of the scale 11 can be detected quickly.

As described above, according to each of the above-described embodiments, the side body flange portions 1b and 12 are removed while the can body portion 1a is not shown, but the can body portion 1a is fixed to the equipment body. The discharge sensor 2, the vapor pressure derivation tube 3, the water supply / drainage tube 4, the temperature sensor 10 can detect the scale 11 adhering / accumulated on the mounting portion of the temperature sensor 10 at an early stage, and the maintenance of forced peeling can be carried out efficiently and easily. it can. The temperature sensor 10 can also be attached to the second flange portion 13 to further facilitate maintenance.

When a gas burner, a kerosene burner, or the like is used as the heating source instead of the electric heater 5, the can body 1a.
In order to effectively absorb the retained heat of the combustion gas, it is important to maintain airtightness with the can body 1, and the effect of not removing the can body 1a during maintenance can be further expected. Further, the shape of the side surface flange portions 1b and 12 and the mounting positions of the tubes 2, 3 and 4 can be easily maintained according to the shape of the can body 1. For example, the flange portion may be provided on the front surface without being limited to the end surface. Further, when the space of the side surface flange portion 12 is small, for example, the vapor pressure lead-out pipe 3 can be provided in the second flange portion 13, and as shown in FIG. You may move to a part of.

[0017]

As is apparent from the above description, according to claim 1 of the steam generator of the present invention, the functions of the steam discharge pipe, the steam pressure lead-out pipe, and the water supply / drainage pipe can be easily restored by maintenance, and It can be reused and has excellent durability.

Further, according to the second aspect of the present invention, the function of the temperature sensor can be easily restored, and scale adhesion / accumulation of the can can be detected quickly.

Further, according to the third aspect of the present invention, the functional recovery of the temperature sensor and the like becomes more effective, and the scale adhesion / accumulation of the can can be efficiently inspected.

[Brief description of drawings]

FIG. 1 is a sectional view showing an embodiment of a steam generator according to the present invention.

FIG. 2 is a sectional view showing another embodiment of the present invention.

FIG. 3 is a sectional view of an essential part of a mounting portion of a temperature sensor of the present invention.

FIG. 4 is a sectional view showing a conventional steam generator.

[Explanation of symbols]

1 can 1a can body 1b, 12 Side flange 2 Steam discharge pipe 3,3a Vapor pressure outlet pipe 4 water supply and drainage pipe 5 Electric heater 10, 10a, 10b Temperature sensor 13 Second flange part

   ─────────────────────────────────────────────────── ─── Continued front page    (72) Inventor Masatomo Yoshimura             1006 Kadoma, Kadoma-shi, Osaka Matsushita Electric             Sangyo Co., Ltd.

Claims (3)

[Claims] 1. A steam generating can body which is heated by a heating source and has a closed periphery is composed of a can body part and a flange part which forms a detachable lid, and the flange part has a steam discharge pipe and a steam pressure. Steam generator with outlet pipe and water supply / drainage pipe. 2. A steam generator according to claim 1, wherein a temperature sensor is provided on the flange portion, and the temperature sensor detects abnormal heating to stop the heating source. 3. A steam generator according to claim 1, wherein the flange portion is provided with a detachable second flange portion forming a lid.