JPH01252802A - Steam conveying device - Google Patents

Abstract

PURPOSE:To prevent a temperature sensor from being incapable of detection due to choking with air and to enable a steam generating can body to be reliably full of water at all times, by a method wherein during an initial operation mode, an ON- OFF valve is forcibly opened during combustion by a burner to discharge air in the steam generating can body, a subtank and a pipeline by which the can body and subtank are interconnected. CONSTITUTION:During combustion by a burner 12 in an initial operation mode in which the interior of a steam generating can body 11 is brought into a full-of-water state during the starting of operation once, by forcibly opening an ON-OFF valve 19, steam generated in the steam generating can body 11 is circulated through a bypass pipe 25, an auxiliary tank 14, and a water feed pipe 15 by means of a conveyance pipe 13. During the circulation, air remaining in the steam generating can body 11 is discharged through the conveyance pipe 13 to the ejector 20 side as air is circulated together with steam. Thus, by a subsequent stop of combustion once, a pressure in the auxiliary tank 14 and the steam generating can body 14 is sufficiently reduced, and water from a water storage tank 21 is returned so that the auxiliary tank 14 and the steam generating can body 11 are full of water. During a subsequent operation mode, a trouble in which the detection of a temperature sensor 33 is disturbed because of the water feed pipe 15 being choked with air can be also prevented from occurring.

Description

[Detailed Description of the Invention] <Industry> Second Field of Application The present invention can heat water in a bathtub or other water storage tank by heating water and conveying the generated high-temperature steam to the outside. Regarding steam conveying equipment that can be used.

<Prior Art> A conventional steam conveying device will be explained with reference to FIG. The steam conveying device is a device that heats water in a steam generating can 11 with a burner 12, generates steam, and conveys the steam to the outside through a conveying pipe 13. However, when the device is operated, there may be cases where there is no water in the steam generating can 11 (naturally, there is no water when the device is operated for the first time), so in such a case First, it is necessary to fill the steam generating can 11 with water. For this purpose, first, the burner 12 is fired to heat the empty steam generating can 11, and the air inside the can 11 is discharged from the steam generating can 11. After that, combustion in the burner 12 is temporarily stopped. As a result, the inside of the steam generating can 11 is cooled and the pressure is reduced, and the water in the water storage tank 21 flows backward through the conveying pipe 13 and is sucked into the steam generating can 11. At this point, air remains in the steam generating can 11, and the water level is also low. When water is sucked in and the temperature of the can body 11 decreases, the temperature sensor 3
3 detects this, the burner 12 starts combustion again after waiting for water to be refilled into the steam generating can 11. This combustion generates steam again in the steam generating can 11, and a portion of it enters the temperature sensor 33 in the water supply pipe 15. Conventionally, this intrusion caused the temperature sensor 33 to
When the temperature is detected to be above a certain level, the on-off valve 19 is opened via the controller 16. When the on-off valve 19 is opened, the steam in the steam generation can 11 enters the auxiliary tank 14 through the on-off valve 19. At this point, the auxiliary tank 14
The water inside has not yet been replenished and is empty. Therefore, the steam is further circulated into the steam generating can 11 through the water supply pipe 15. Through this circulation, the air inside the can body 11, auxiliary tank 14, water supply pipe 15, etc. is transferred to the conveyor pipe 1.
3 to the water tank 21 side. Therefore, when the temperature sensor 33 stops the combustion of the burner 12 again after a certain period of time after the opening/closing valve 19 is opened, the pressure inside the steam generating can 11 and the auxiliary tank 14 is sufficiently reduced to a vacuum state due to condensation, and the water is stored. From tank 21 to auxiliary tank 1
4. Sufficient water is returned to the steam generating can 11, making it full of water. Once the inside of the can body 11 is filled with water in this manner, the burner 12 is continuously operated to cause continuous combustion.

As described above, in the conventional device, the opening/closing valve 19 is opened at the time of re-combustion after the burner 12 has once stopped combustion, in response to a rise in the temperature of the temperature sensor 33 of the water supply pipe 15.

<Problems to be Solved by the Invention> However, in the above-mentioned conventional device, at the time when combustion of the burner 12 is once stopped and re-combustion is started, the steam generating can 11 is not yet filled with water, and the steam generating body 11 is not yet filled with water. Can body 11
It is normal for a considerable amount of air to remain in the water supply pipe 15, so that the remaining air may enter the temperature sensor 33 part of the water supply pipe 15 and prevent it from entering the temperature sensor 33 side from the steam generating can body 11. There was a problem of interference. If such a situation occurs, the temperature sensor 33 will not detect a high temperature no matter how long it takes after reburning, and the on-off valve 19 will not be opened, resulting in no opportunity to replenish water to the steam generating can body 11. However, there was a problem in that the steam generating can body 11 continued to be in an empty firing state.

<Means for Solving the Problems> A steam conveying device of the present invention that solves the above problems includes a steam generation can heated by combustion in a burner, a subtank for gravity replenishing water to the steam generation can. , a short-circuit pipe branched from a steam conveying pipe from the steam generation can and short-circuited to the sub-tank, and an on-off valve provided in the middle of the short-circuit pipe; A steam conveying device comprising an initial operation mode for once filling up with water, and a continuous operation mode for continuously conveying steam and automatically replenishing water while continuously burning a burner after filling with water, the initial operation mode By once forcibly opening the on-off valve during burner combustion, the air in the steam generating can, the sub-tank, and the pipe connecting the two can be wiped out by the circulating steam.

<Operation> During the initial operation mode to temporarily fill the steam generation can with water, the on-off valve is forcibly opened during burner combustion, and the inside of the steam generation can, the subtank, and the pipe connecting the two are Therefore, during the initial operation mode, the air is always swept away from the steam generating can and its associated piping, and problems caused by air clogging are reliably eliminated. Therefore, the safety of the device is also improved. Furthermore, since the air is reliably removed, the interior of the steam generating vessel is also reliably filled with water afterwards. Therefore, subsequent operation becomes stable.

<Example> FIG. 1 is an overall configuration diagram of an apparatus implementing the present invention, and FIG. 2 is a flowchart of operation control by a controller.

Steam generated in the steam generating can 11 is ejected into the ejector 20 through the conveying pipe 13. A return pipe 22 from a water storage tank 21 such as a bathtub is connected to a negative pressure forming portion of the ejector 20, and an outgoing pipe 23 to the water storage tank 21 is connected to an outlet from the ejector 20. A return pipe 24 to the auxiliary tank 14 is connected from the middle of this outgoing pipe 23. When steam is ejected into the ejector 20 , water from the water tank 21 is sucked into the ejector 20 through the return pipe 22 , undergoes heat exchange, becomes hot water, and circulates to the water tank 21 through the outgoing pipe 23 . do. A portion of the water passing through the outgoing pipe 23 is transferred to the auxiliary tank 14.
The water is returned through the return water pipe 24.

A short-circuit pipe 25 branches off from the middle of the transport pipe 13 and is connected to the auxiliary tank 14 via an on-off valve 19 .

A water supply pipe 15 is connected from the auxiliary tank 14 to the water storage tank 21, and a check valve 26 and a temperature sensor 33 are provided in the middle.

The burner 12 is provided with a fuel supply on-off valve 18. In addition, the combustion detection sensor 31 determines whether Burnae 2 is burning or not.
Detected by

Reference numeral 16 denotes a controller with a built-in microcomputer, which receives commands from the remote control section 17, information from the temperature sensor 33, combustion detection sensor 31, etc., and controls devices such as opening/closing operations of the fuel supply on-off valve 18 and on-off valve 19. Automatically controls the driving behavior of the vehicle.

The operation control by the controller 16 can be broadly divided into an initial operation mode and a continuous operation mode.

The continuous operation mode is the same as in the conventional device, with burner 1
When the water in the can body 11 decreases, the temperature sensor 33 detects a temperature rise due to steam intrusion into the water supply pipe 15, and the temperature rises through the controller 16. Open the on-off valve 19. When the on-off valve 19 opens, steam is introduced into the auxiliary tank 14, and as a result, the atmospheric pressures in the auxiliary tank 14 and the steam generating can body 11 become the same.
Water in the auxiliary tank 14 is fed by gravity through a water supply pipe 15. When water is supplied, the temperature sensor 33 detects a decrease in temperature, and the on-off valve 19 is closed. Repeat the above operations.

In the initial operation mode, the steam generation can 11 is activated at the start of operation.
This mode is for temporarily filling up the tank with water. The present invention is characterized in that during this initial operation mode, the on-off valve 19 is forcibly opened during combustion in the burner 12, regardless of the temperature detected by the temperature sensor 33. During combustion in the burner 12 in the initial operation mode, by forcibly opening the on-off valve 19, the steam generated in the steam generating can 11 is transferred from the conveying pipe 13 to the short-circuit pipe 25, the auxiliary tank 14,
It circulates with the water supply pipe 15. During that time, steam generation canister 1
The air remaining in the ejector 1 and the like is circulated together with the steam and is discharged from the conveying pipe 13 to the ejector 20 side. Therefore, once the combustion is stopped after that, the pressure inside the auxiliary tank 14 and the steam generating can 14 is sufficiently reduced, and the water from the water storage tank 21 is returned to the auxiliary tank 14 and the steam generating can 11 to fill them with water. Further, even in the subsequent continuous operation mode, the water supply pipe 15 is no longer clogged with air and the detection of the temperature sensor 33 is prevented.

The first friend arrest mode will be explained in detail with reference to FIG. First, when the initial operation mode is started, the burner 12 starts combustion (flow (a)). As a result, the empty brown gas generating can body 11 is heated, the air inside expands, and the water storage tank 21 is heated.
It is properly discharged to the side. Next, when the combustion start is input to the controller 16 by the combustion detection sensor 31, a timer starts working, and after a certain period of time (short time) has elapsed (flow
(b)), the burner 12 temporarily stops combustion (flow (c)
). Due to this combustion stop, the air inside the steam generating can body 11 cools and becomes depressurized, and as a result, water flows from the water storage tank 21 to the return pipe 22, the outgoing pipe 23, the ejector 20, and the conveying pipe 13.
The steam is sucked into the steam generating can body 11 through the process. At this point, a considerable amount of air remains in the steam generating can 11, and the water level due to the returned water is also low. When water is returned to the steam generating can body 11 (flow (d)), the temperature sensor 3
3 detects a temperature drop, the burner 12 is turned on (E), and re-combustion is started. When re-combustion starts, the combustion detection sensor 31 detects this, the timer in the controller 16 operates, and - after a certain period of time (flow (
)), the on-off valve 19 is forcibly opened (flow ()))
The reason for waiting for the certain period of time (flow) is because the pressure car J2 in the steam generating can body 11 was waited for to rise. When the on-off valve 19 is forcibly opened, the steam in the steam generating can 11 is introduced into the empty auxiliary tank 14 through the short-circuit pipe 25.
Further, the water is circulated through the water supply pipe 15 to the steam generating can body 11. Through this circulation, the steam generation can 11, the auxiliary tank 1
4. Air remaining in the water supply pipe 15 etc. is swept away along with steam from the conveying pipe 13 to the ejector 20 and water storage tank 21 side.

Therefore, after a certain period of time after the on-off valve 19 is forcibly opened (
When the burner 12 is turned off to stop combustion during flow (h)), the steam in the steam generating can 11 and the auxiliary tank 14 is condensed and the pressure is reduced to a vacuum state. As a result, water is drawn from the water storage tank 21 into the steam generating can 11 and the auxiliary tank 14, filling them with water. When water is returned to the steam generating can body 11 from the water storage tank 21 side (flow (nu)), the temperature drops, so the temperature sensor 33 detects this and closes the on-off valve 19 (flow (ru)). . The on-off valve 19 may be closed for a certain period of time after the burner is turned off (flow). After the water is returned and the on-off valve 19 is closed,
Combustion in the burner 12 is started again, and the mode shifts to continuous operation mode.

Effect> The present invention has the above configuration, and by once forcibly opening the on-off valve during combustion of the burner in the initial operation mode,
Since the circulating steam is configured to sweep out the air inside the steam generation can, the subtank, and the pipe connecting the two, the steam generation can and the subtank can be reliably filled with water. Therefore, the operation during subsequent continuous operation is very stable. Also, since the air is swept away,
It reliably prevents temperature sensors and on-off valves from malfunctioning due to air clogging, and also eliminates inconveniences such as dry heating.

[Brief explanation of the drawing]

FIG. 1 is an overall configuration diagram of an apparatus implementing the present invention, and FIG. 2 is a flowchart of operation control by a controller. 11: Steam generation can body 12: Burner 13: Conveying pipe 14: Auxiliary tank 15: Water supply pipe 16: Controller 19: Opening/closing valve 20: Ejector 21: Water tank 33: Temperature sensor

Claims (1)

[Claims] A steam-generating can heated by combustion in a burner, a sub-tank for gravity-replenishing water to the steam-generating can,
It has a short-circuit pipe branched from the steam conveyance pipe from the steam generation can and short-circuited to the sub-tank, and an on-off valve provided in the middle of the short-circuit pipe, and as an operation mode,
The steam conveying device is equipped with an initial operation mode for once filling the steam generating vessel with water, and a continuous operation mode for continuously conveying steam and automatically replenishing water while continuously burning a burner after the water is filled. By once forcibly opening the on-off valve during burner combustion in the initial operation mode,
A steam conveying device characterized in that circulating steam sweeps out air inside the steam generating can, inside the sub-tank, and inside a pipe line connecting both.