JPH08261403A - Boiler - Google Patents

Abstract

PURPOSE: To supply a steam consuming appliance such as a heatless iron with steam free from fluctuation of pressure and having an excellent quality, for a long time, without enlarging a boiler and also to prevent boiling of drain water in a drain tank. CONSTITUTION: A boiler 10 comprises a first boiler 12 and a second boiler 14. A first steam drum 22 is closed when a steam pressure inside the drum becomes a set value or below, and steam is supplied from a second steam drum 24 to a heatless iron 18, while drain water in a drain tank 20 is discharged into the first steam drum 22 due to a pressure difference between the inside of the drain tank 20 and that of the first steam drum 22 which is brought about at this time. When the steam pressure inside the first steam drum 22 is restored to the set value or above, the second steam drum 24 is closed and the steam is supplied from the first steam drum 22. In this state, the drain water is stored in the drain tank 20.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a boiler, and more particularly to a boiler suitable for supplying steam to a commercial heatless iron or the like.

[0002]

2. Description of the Related Art As shown in FIG. 4, a conventional small-sized boiler 1 of this type includes a boiler main body 2, a drain recovery tank 3 attached to the boiler main body 2, and an electric component section 4.
The water inside the steam can is heated by an electric heater (both not shown) to generate steam, which is supplied to the heatless iron 5, and the steam and drain on the outlet side are returned to the drain recovery tank 3, where Boiler 2
It was supplied by a pump (not shown).

[0003]

However, in the small boiler 1 as described above, when the amount of drain in the drain recovery tank 3 becomes large, water boils here, and when the water is pumped into the boiler main body 2, There is a problem that cavitation occurs in the pump, so-called air trapping occurs, and the pump is destroyed.

On the other hand, as shown in FIG. 5, tap water or the like is directly supplied to the drain recovery tank 3 from the water supply pipe 6 to prevent boiling in the drain recovery tank 3. There is something.

However, if tap water or the like is directly supplied from the water supply pipe 6 in this way, the temperature of the water sent to the steam can 7 in the boiler main body 2 by the pump 8 becomes too low,
There is a problem that efficiency is reduced.

Further, when water is directly supplied from the water supply pipe 6 into the drain recovery tank 3, the liquid level is controlled by the float. However, if this is done, the drain recovery tank 3 becomes too large. There is a problem.

Further, conventionally, as shown in FIG.
Steam is supplied from the boiler to the heatless iron 5, but when the heatless iron 5 consumes a large amount of steam, the steam pressure decreases when it is used for a long time, and the temperature of steam at the start of use and that of the steam after use decrease. However, there was a problem in that the finish of the press was poor.

For this, it is conceivable to use a large boiler, but this makes the device large,
In addition, there is a new problem that the cost increases.

The present invention has been made in view of the above-mentioned problems of the prior art. Even if it is small, the pump is not destroyed by cavitation and the heater efficiency is not lowered, and the steam consumption is small. It is an object of the present invention to provide a boiler capable of keeping the temperature of steam constant even when the number is large.

[0010]

SUMMARY OF THE INVENTION According to the present invention, first and second steam cans each independently generating steam, and steam outlets of the first and second steam cans are connected to each other, and a single tip is provided. First and second steam extraction pipelines connected to the steam supply pipeline, and return steam discharged from the return pipeline connected to the steam supply pipeline to the return pipeline from the steam consuming device And a sealed drain tank that receives the drain, and an air vent valve that opens and closes the inside of the drain tank with respect to the atmosphere,
A drain conduit connecting the drain outlet of the drain tank to the steam chamber of the first steam can via a drain opening / closing valve, a pressure sensor for detecting the steam pressure in the first steam can, and the first steam extraction. When the steam pressure in the first steam can is equal to or higher than a set value based on a signal from the steam control valve controlling the connection of the pipeline and the second steam extraction pipeline to the steam supply pipeline, and the pressure sensor, By the steam control valve, the steam of the first steam can is introduced into the steam supply pipe line, the second steam can side is shut off, the air vent valve is set to “open”, and the drain opening / closing valve is set to “close”. When the value is less than a set value, the steam control valve shuts off the first steam can side, and the steam of the second steam can is introduced into the steam supply pipe line, and the air bleeding valve is closed, and thereafter. A boiler having a control device for opening the drain on-off valve. Accordingly, it is intended to achieve the above object.

According to a second aspect of the present invention, in the first aspect of the invention, the steam control valves are provided in the middle of the first and second steam extraction pipelines, respectively, and first and second opening / closing are provided to open and close them. It is configured to include a valve.

According to a third aspect of the invention, in the second aspect of the invention, the drain pipeline is connected to the first vapor extraction pipeline via the drain opening / closing valve, and the drain opening / closing valve and the first pipeline are connected to each other. The opening / closing valve is in a first position where the first steam extraction conduit is “open” and the drain opening / closing valve is “closed”, and the first steam extraction conduit is “closed” and the drain conduit is first steam extraction conduit. The one-position two-position switching valve having the second position for switching to the first steam can side.

The invention according to claim 4 is the invention according to claim 1, wherein the steam control valve is provided in the middle of the second steam extraction pipeline and opens and closes the second control valve. The check valve is provided in the middle of the first steam extraction pipeline and includes only a check valve that allows only the flow of steam from the first steam can toward the steam supply pipeline.

Further, the invention of claim 5 relates to claims 1 to 4.
In any one of the inventions, the first and second steam cans are arranged in separate first and second boilers, respectively, and the first and second boilers are laterally arranged in parallel and vertically stacked. It is possible to freely arrange, including.

According to the invention of claim 6, in the invention of claim 5, a water tank for supplying water to the first and second boilers is provided separately from the first and second boilers, and
It can be freely placed at any position.

[0016]

In the present invention, of the first and second steam cans that independently generate steam, the steam is supplied from the first steam can in a normal state, and the steam pressure in the first steam can is kept below a certain value. When it goes down, the first steam can is switched to the second steam can, and steam is supplied from here, and at the time of this switching, the fact that the steam pressure in the first steam can has decreased is utilized, The pressure is increased, and the drain in the drain tank is discharged into the first steam can.

When the steam pressure in the first steam can returns to a value higher than the set value, the second steam can side is shut off and the steam is taken out only from the first steam can. Further, the first steam can and the drain tank are shut off. Then, the drain tank is opened to the atmosphere by the air bleeding valve.

If the steam control valve comprises first and second opening / closing valves provided in the first and second steam extraction conduits, the first and second opening / closing valves can be selectively opened / closed.
The steam extraction from the steam can can be easily switched.

Further, the drain opening / closing valve and the first opening / closing valve are
By using a two-position switching valve for the body, the control valve can be made small and at low cost, and the drain opening / closing valve and the first
It is possible to reliably open and close the on-off valve at the same time.

By comprising the steam control valve, the second opening / closing valve for opening / closing the second steam withdrawing line, and the check valve provided in the first steam withdrawing line, the inside of the first steam can When the steam pressure drops below the set value, the steam pressure extraction is switched from the first steam can to the second steam can by operating only the second opening / closing valve, and the set pressure recovery is also switched only by closing the second opening / closing valve. be able to.

Further, the first and second steam cans are provided in separate first and second boilers, respectively, and these boilers can be arranged in parallel or stacked in any direction, so that the boiler installation space can be effectively utilized. , The usability can be improved.

Further, by separately providing water tanks for supplying water to the first and second boilers and arranging the water tanks at arbitrary positions with respect to the first and second boilers, the installation space is saved and the usability is improved. It is possible to improve.

[0023]

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

As shown in FIG. 1, a first embodiment of the present invention.
The example boilers 10 each independently generate steam.
The first boiler 12 and the second boiler 14 which are
Water tank 16 and steam for supplying water to the boiler
If the consumer device is a heatless iron 18, for example,
The drain discharged from the iron 18 is collected.
And a drain tank 20 for the first boiler.
-12 steam pressure in the first steam can 22 is, for example, steady state
2 kg / cm²Set value from 1.8 Kg / cm ²Drop to
When steaming, steam from the second steam can 24 of the second boiler 14
The heat is supplied to the heatless iron 18 by switching and
The drain in the tank 20 is returned to the first steam can 22.
It is a scam.

More specifically, the first and second steam withdrawing pipelines connected to the steam outlets 22A and 24A of the first and second steam cans and having the tips connected to the single steam supply pipeline 26. 28, 30, an air bleeding solenoid valve 32 that opens and closes the upper end of the drain tank 20 to the atmosphere, and a drain conduit 34 for discharging drain from the lower end of the drain tank 20 to the outside. First opening of steam extraction line 28
Position, the steam supply line 26 of the first steam extraction line 28
A two-position electromagnetic switching valve 36 which is closed at the same time as the second position for switching and connecting the first steam can 22 side to the drain conduit 34, and is provided in the middle of the second steam extraction conduit 30. Solenoid valve 38 for closing or opening it
And a pressure sensor 40 for detecting the vapor pressure in the first vapor can 22, and a control device 42 for controlling the air bleeding solenoid valve 32, the electromagnetic switching valve 36, and the electromagnetic opening / closing valve 38, respectively. It is equipped with.

Reference numeral 44 in FIG. 1 is a heatless iron 18
A return line from the drain tank 20 to the drain tank 20 is shown. The return pipe 44 is provided with a check valve 4 from the heatless iron 18 side.
6 and the throttle valve 48 are arranged to prevent the reverse flow of steam from the drain tank 20 side toward the heatless iron 18 and regulate the steam flow rate.

Reference numerals 50A and 50B in FIG. 1 denote the water from the water supply tank 16 in the first steam can 22 and the second steam can 24, respectively.
Pumps for supplying pressure to the heatless iron 18 and lever levers 52 provided on the heatless iron 18 are shown.
When the lever valve 52 is operated, steam is ejected from the steam hole 54 of the heatless iron 18.

Next, the control of each valve by the control device 42 will be described together with the operation of the boiler 10.

First, in the steady state, that is, when the steam pressure in the first steam can 22 is 1.8 Kg / cm ² or more, the control device 42 causes the electromagnetic opening / closing valve 38 to control the second steam extraction line 3
0 is “closed”, the air bleeding solenoid valve 32 is “open”, and the electromagnetic switching valve 36 is in the first position where the first steam extraction conduit 28 is opened and the drain conduit 34 is closed.

Therefore, the steam is the first steam can 22, the steam outlet 22A, the first steam extraction conduit 28, and the steam supply conduit 26.
After being supplied to the heatless iron 18, the residue ejected from the steam hole 54 is collected as drainage in the drain tank 20 via the return pipe line 44. The inside of the drain tank 20 is open to the atmosphere because the air bleeding solenoid valve 32 is opened, and the pressure thereof is 0 Kg / cm ² .

Steam hole 54 of heatless iron 18
When the amount of steam jetted from the steam generator increases, and when this continues for a long time, the steam pressure in the first steam can 22 drops, and when the steam pressure becomes less than the set value of 1.8 Kg / cm ² , the pressure sensor 40 Detects this and outputs a signal to the controller 42.

Based on the signal from the pressure sensor 40, the control device 42 first drives the electromagnetic opening / closing valve 38 to open the second steam extraction conduit 30, so that the steam in the second steam can 24 is heatless ironed. 18 to be supplied. At the same time, the air bleed solenoid valve 32 is driven to close the drain tank 20.

In this way, the second steam can 24
Steam kg / cm ² reaches the drain tank 20 through a heatless iron 18, increase the pressure of the drain tank 20 to 2Kg / cm ^2.

Since the pressure increase in the drain tank 20 is about 0.1 second, the electromagnetic switching valve 38 is driven 0.1 second after the electromagnetic opening / closing valve 38 is opened, and the first vapor extraction pipeline is driven. The steam supply pipeline 26 side of 28 is closed, and the drain pipeline 34 is switched to be connected to the steam outlet 22A of the first steam can 22.

At this time, since the steam pressure in the first steam can 22 is less than 1.8 kg / cm ^2, it is lower than the pressure in the drain tank 20. Therefore, the drain water stored in the drain tank 20 is pressurized. Depending on the difference, the first steam can 2 is discharged from the steam outlet 22A through the drain conduit 34 and the electromagnetic switching valve 36.
It is discharged into 2.

The water discharged from the drain tank 20 to the first steam can 22 is heated with the water remaining in the first steam can 22 to generate steam, and the inside of the first steam can 22 is gradually increased. Boost to.

In this process, the steam supplied from the second steam can 24 to the heatless iron 18 is communicated with the first steam can 22 through the drain tank 20 through the return line 44 from the heatless iron 18. Moreover, since the steam pressure in the first steam can 22 is lower than the steam pressure in the second steam can 24, 2 kg / cm ² of steam is circulated in the heatless iron 18.

When the vapor pressure in the first vapor can 22 gradually increases and exceeds ² kg / cm ² , the pressure sensor 40 detects this and outputs a signal to the control device 42.

The control device 42 drives the electromagnetic switching valve 36 to the first position where the drain conduit 34 is closed and the first steam extraction conduit 28 is opened, and at the same time, the electromagnetic switching valve 38 is operated to the second steam extraction pipe. The passage 30 is closed, whereby the first steam can 2
The steam in 2 is supplied to the heatless iron 18. At the same time, the air bleed solenoid valve 32 is opened, the drain tank 20 is opened to the atmosphere, and its pressure is set to 0 kg / cm ^2.
And return to the initial state.

As described above, when the pressure in the first steam can 22 is reduced, the steam is switched to the second steam can 24 and the steam is supplied from here, so the heatless iron 1
The steam of the set pressure (2 Kg / cm ² ) is constantly supplied to 8, so that a temperature difference does not occur between when the heatless iron 18 is used and when it is used.

Further, the drain water in the drain tank 20 does not change the steam supply pressure to the heatless iron 18 and does not lower the temperature in the second steam can 24 during steam generation. Therefore, it is possible to reliably and frequently collect the gas in the first steam can 22 without the heat-resistant pump. Therefore, the pump is not destroyed by cavitation.

In the above-described embodiment, the electromagnetic opening / closing valve 38 and the electromagnetic switching valve 36 are used to set the steam supply source to the first steam can 22 and the second steam can 24 according to the fluctuation of the steam pressure in the first steam can 22. However, the present invention is not limited to the configuration of the embodiment, and if necessary, the first steam can 2
When the steam pressure in 2 drops below the set value, steam is supplied from the second steam can 24 to the heatless iron 18, etc.,
Further, when the vapor pressure in the first steam can 22 has recovered to the set value or higher, the second steam can 24 may be closed to supply the steam from the first steam can 22.

Therefore, for example, as shown in FIG. 2, a check valve 56 is provided in the middle of the first steam extraction conduit 28 so as to allow only the steam flow from the first steam can 22 to the heatless iron 18. Instead of the electromagnetic switching valve 36, a drain electromagnetic on-off valve 58 may be provided that only opens and closes the connection between the drain conduit 34 and the first vapor extraction conduit 28.

In this embodiment, when the steam pressure in the first steam can 22 drops below the set value, the check valve 56 automatically opens the second steam extraction pipe line 30 to open the first steam extraction pipe. Since the line 28 is closed, the first vapor extraction line 28
There is no need to provide a separate valve for opening and closing the.

In the embodiment shown in FIG. 1, the solenoid opening / closing valve 3
Although the steam flows backward from the second steam can 24 to the first steam can 22 for a short period of time from the time when the valve 8 is opened to the time when the electromagnetic switch valve 36 switches the direction to close the first steam extraction conduit 28, In this embodiment, it is possible to prevent the vapor flow from being generated in the opposite direction.

The other operation and structure are the same as those in the first embodiment, and the description thereof will be omitted.

In place of the electromagnetic switching valve 36 in the first embodiment shown in FIG. 1, a first electromagnetic opening / closing valve for opening / closing the first steam extraction conduit 28 and this first electromagnetic opening / closing valve are separately provided. A drain electromagnetic on-off valve similar to that in the second embodiment of FIG. 2 may be provided and these may be controlled separately.

In this case, the first electromagnetic on-off valve can be closed at the same time when the second electromagnetic on-off valve 38 is opened to prevent the reverse flow of steam from the second steam can 24 toward the first steam can 22.

Next, the layout of the boiler to which the present invention is applied will be described with reference to FIG.

This layout corresponds to the first boiler 12
In addition, the second boiler 14 and the water supply tank 16 can be freely arranged independently of each other.

That is, the first boiler 12, the second boiler 14 and the water supply tank 16 shown in FIG. 4 (A) are combined with the unit shown in FIG. 4 (B) to be shown in FIG. 4 (C). Thus, the first boiler 12 and the second boiler 14 are parallel to each other on the moving table 64, and the water tank 1
6 is arranged, or as shown in FIG. 4 (D), the first and second boilers 12 and 14 are arranged on the upper stage of the fixed base 66, and the water supply tank 16 is arranged on the lower stage thereof.

When the installation space is smaller, the first and second boilers 12 and 14 and the water tank 1
You may make it arrange | position 6 in a vertical direction so that 3 may be piled up.

That is, in this embodiment, the first boiler 12, the second boiler 14 and the water supply tank 16 are provided as separate and independent modules, and these modules can be arbitrarily combined, so that the space for installation and the usability can be improved. It can be laid out as desired. Moreover, since the combination is easy, the number of boilers can be freely increased or decreased according to the heater capacity.

[0054]

Since the present invention is configured as described above, it is possible to increase the cost and the size of the apparatus without increasing the cost.
Further, it has an excellent effect that the drain can be collected without lowering the heater efficiency, and even if the steam consumption is large, the pressure fluctuation is small and the steam can be constantly supplied with good quality.

[Brief description of drawings]

FIG. 1 is a pipeline diagram showing a first embodiment of a boiler according to the present invention.

FIG. 2 is a pipeline diagram showing the second embodiment.

FIG. 3 is an exploded perspective view showing a layout example of two boilers to which the present invention is applied.

FIG. 4 is a perspective view showing a conventional small boiler and heatless iron.

FIG. 5 is a schematic pipeline diagram showing another conventional small boiler and heatless iron.

[Explanation of symbols]

 10 ... Boiler 12 ... 1st boiler 14 ... 2nd boiler 16 ... Water supply tank 18 ... Heatless iron 20 ... Drain tank 22 ... 1st steam can 22A, 24A ... Steam outlet 24 ... 2nd steam can 26 ... Steam supply pipe Line 28 ... First steam extraction line 30 ... Second steam extraction line 32 ... Air bleed solenoid valve 34 ... Drain line 36 ... Electromagnetic switching valve 38 ... Second solenoid opening / closing valve 40 ... Pressure sensor 42 ... Control device 44 ... Return line 46, 56 ... Check valve 58, 62 ... Drain solenoid valve

─────────────────────────────────────────────────── ───

[Procedure amendment]

[Submission date] April 4, 1995

[Procedure Amendment 1]

[Document name to be corrected] Drawing

[Name of item to be corrected] Fig. 4

[Correction method] Change

[Correction content]

[Figure 4]

[Procedure Amendment 2]

[Document name to be corrected] Drawing

[Name of item to be corrected] Figure 5

[Correction method] Change

[Correction content]

[Figure 5]

Claims (6)

[Claims] 1. A first and a second steam can that independently generate steam, and steam outlets of the first and second steam cans, the ends of which are connected to a single steam supply pipeline. A first and a second steam extraction line, and a return line from the steam consuming device which is connected to the steam supply line and is in a closed state for receiving return steam and drain discharged from the return line. A drain tank; an air bleeding valve for opening and closing the inside of the drain tank with respect to the atmosphere; a drain conduit for connecting the drain outlet of the drain tank to the steam chamber of the first steam can via the drain opening / closing valve; From a pressure sensor that detects the vapor pressure in the first steam can, a steam control valve that controls the connection of the first steam extraction pipeline and the second steam extraction pipeline to the steam supply pipeline, and from the pressure sensor Based on the signal of, the steam pressure in the first steam can is set At the above time, the steam control valve introduces the steam of the first steam can into the steam supply line and shuts off the second steam can side, and the air bleeding valve is "opened" and the drain opening / closing valve is opened. When it is "closed" and is less than a set value, the steam control valve shuts off the first steam can side and introduces the steam of the second steam can into the steam supply pipeline, and the air vent valve is turned on. A boiler having a controller that closes and then opens the drain on-off valve. 2. The steam control valve according to claim 1, wherein the steam control valve is provided in the middle of each of the first and second steam extraction pipelines and includes first and second opening / closing valves for opening and closing these. Boiler characterized by that. 3. The drain line according to claim 2, wherein the drain line is connected to the first steam extraction line via the drain open / close valve, and the drain open / close valve and the first open / close valve are connected to the first open / close valve. A first position in which the steam extraction line is "open" and the drain opening / closing valve is "closed";
A boiler characterized in that it is a one-position two-position switching valve having a second position in which the first steam extraction conduit is "closed" and the drain conduit is switched to the first steam can side of the first steam extraction conduit. 4. The steam control valve according to claim 1, wherein the steam control valve is provided in the middle of the second steam extraction pipeline, and is provided in the middle of the second opening / closing valve for opening and closing the first steam extraction pipeline. And a check valve that allows only the flow of steam from the first steam can in the direction of the steam supply pipe. 5. The first and second steam cans according to claim 1, wherein the first and second steam cans are arranged in separate first and second boilers, respectively. A boiler characterized by being freely arranged, including parallel in the direction and stacking in the vertical direction. 6. The water tank for supplying water to the first and second boilers according to claim 5, wherein the water tank is provided separately from the first and second boilers, and can be arranged at any position. A characteristic boiler.