JP2001324133A - Water heater provided with flame arrester - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a water heater provided with a flame arrester in which clogging with dusts entrained in the outdoor air is hardly generated. SOLUTION: The water heater is provided with a hot-water storage chamber R1 and a combustion chamber R2 provided respectively in the upper and lower parts of the main body 11 of a hollow vessel. An intake for supplying air to the inside is provided to the combustion chamber. An exhaust pipe 17 having a vent in the upper part of the body is passed through the hot-water storage chamber to discharge the exhaust gas from the inside of the combustion chamber to the outside. A flame arrester 27 is provided at the intake of the combustion chamber, and a filter 29 for dust removal is provided upstream of the flame arrester. The flame arrester and the filter may be placed vertically at the sidewall of the combustion chamber, or they may be integrally removably constituted. Two filters may be placed in a manner that openings thereof are not projectively interposed with each other, and further at least the filter in the upstream side may be removably attached. A heating means may be provided to hold the filters at a high temperature.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a water heater with a flame shield device installed in a garage, a basement, a warehouse or the like in which flammable materials such as gasoline, thinner, and benzene which generate combustible vapor are stored.

[0002]

2. Description of the Related Art Conventionally, as shown in FIG. 4, for example, this type of water heater with a flame shield device is provided with a hot water storage chamber 2 and a combustion chamber 3 above and below a hollow cylindrical main body 1, and a combustion chamber 3 is provided. Is provided with an air supply port 4 for supplying air therein, and an exhaust passage 5 which penetrates the axial center position of the hot water storage chamber 2, opens at the top of the main body 1, and discharges combustion gas in the combustion chamber 3 to the outside. Further, a flame arrester (flame shield device) 6 is provided at the air supply port. The water heater with a flame shield device is a gas burner 3a provided in the combustion chamber 3.
When the high-temperature exhaust gas burned in the above passes through the exhaust passage 5, the water is heated by heat exchange with water supplied into the hot water storage chamber 2 and stored as hot water of a predetermined temperature, and is supplied to the outside as appropriate. It has become so.

[0003] The frame arrestor 6 is a metal plate-like body provided with a large number of minute openings, such as a punched metal or a lath net. Each flammable gas has a quenching distance at which the flame does not propagate with a gap smaller than the flammable gas. The flame arrestor 6 uses this to make the size of the opening small, such as 1.5 to 3 mm. It is shaped.

[0004]

However, since the opening of the flame arrestor 6 is small as described above, the flame arrestor 6 is easily clogged by dust or the like contained in the outside air. When the flame arrester is clogged with dust in this way, an incomplete combustion state occurs due to insufficient air supply in the combustion chamber 3, and the room around the water heater becomes an increased state of carbon monoxide gas, and a person or the like in the room However, there was a risk of damage such as carbon monoxide poisoning. For this reason, it is necessary to frequently perform work for cleaning dust clogging, which is very complicated. Therefore, an object of the present invention is to solve the above-described problem, and an object of the present invention is to provide a water heater with a flame-shielding device that can prevent clogging of a frame arrestor due to dust or the like contained in the outside air. .

[0005]

In order to achieve the above object, a structural feature of the invention according to claim 1 is to introduce outside air from an air supply port into a substantially airtight room, A water heater with a flame-shielding device having a combustion chamber that discharges combustion gas from a burner provided at an exhaust port from an exhaust port, and a flame-shielding device provided in an air supply port or an air supply passage for guiding outside air to the air supply port. In addition, a dust filter is provided on the upstream side of the flame shield device.

According to the first aspect of the present invention, the clean air from which large dust contained in the outside air has been removed by the dust filter provided on the upstream side of the flame-shielding device. Can be sent to the device.

According to a second aspect of the present invention, in the water heater with a flame-shielding device according to the first aspect, the flame-shielding device is disposed substantially horizontally, and the dust filter is provided with a burner. It is provided substantially horizontally below the bottom. This allows the dust accumulated in the dust filter to fall downward by its own weight.

According to a third aspect of the present invention, in the water heater with a flame-shielding device according to the first aspect, the flame-shielding device and the dust filter are vertically arranged on a side wall of the combustion chamber. It was arranged in. This makes it difficult for combustion products such as drains generated in the combustion chamber to adhere to the flame shield device even if they fall, and the dust contained in the outside air is efficiently removed by the dust filter.

According to a fourth aspect of the present invention, there is provided a water heater with a flame shield device according to any one of the first to third aspects, wherein the flame shield device and the dust filter are provided. And the flame shield device and the dust filter are detachable from each other. This allows
The flame shield device and the dust filter can be collectively processed.

According to a fifth aspect of the present invention, there is provided a water heater with a flame shield device according to any one of the first to fourth aspects, wherein the dust filters are opposed to each other. In addition to being constituted by two filters, the openings of the respective dust removal filters are arranged so as not to be projected, and at least the upstream dust removal filter is detachable.

According to the fifth aspect of the present invention, a large amount of dust is first removed by the dust filter on the upstream side, and the dust passing through the opening is surely removed by hitting the dust filter on the downstream side. (2) Large dust can be more efficiently removed by the two dust filters. In addition, since at least the dust collecting filter on the upstream side where dust is more likely to be clogged is detachable, the dust collecting filter on the upstream side where dust is more likely to accumulate can be efficiently cleaned.

According to a sixth aspect of the present invention, there is provided a water heater with a flame shield device according to any one of the first to fifth aspects, wherein the dust removal filter is maintained at a high temperature. The heating means is provided. This allows
The self-cleaning effect of removing large dust clogged in the dust filter by heating is exhibited, and the dust filter is less likely to be clogged.

[0013]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS Next, an embodiment of the present invention will be described with reference to the drawings. FIG. 1 shows a front view of a water heater with a flame shield device (hereinafter simply referred to as a water heater) according to a first embodiment. It is shown by a sectional view. The water heater 10 comprises a main body 11 which is a cylindrical iron-made container whose upper and lower ends are closed and whose inner surface is enameled, an outer case 30 covered on the outer periphery and the upper surface of the main body 11, and operation of the water heater. Is provided.

The main body 11 is provided with a cylindrical portion 12, a bottom plate 13 which is a flat plate closing the lower end, and a spherical upper head plate 14 which is slightly bulged upward and closes the upper end. It is erected on the floor G by the provided leg 11a. The main body 11 is provided with a base portion 15 which is a flat plate which is disposed coaxially at a position slightly above the bottom plate portion 13 and partitions the inside of the main body 11 up and down. A circulation room S1 for circulation is provided. Cylindrical part 12
Is provided with a ventilation hole 12a in a part of the lower side of the base portion 15. In addition, the main body 11 is provided with a lower spherical plate 16 which is coaxially disposed at a predetermined position above the base portion 15 and which swells upward and slightly swells upward and vertically divides the inside of the main body 11. The end plate 16 is divided into an upper hot water storage chamber R1 and a lower combustion chamber R2.

The upper end plate 14 and the lower end plate 16 are provided with openings 14a, 16a at axial positions, respectively.
a, 16a extend in the axial direction at the axial center position,
Exhaust pipe 17 forming an exhaust passage penetrating through 4a, 16a
Has been fixed. Further, a twisted plate-shaped baffle plate 17a is fixed to the inner wall of the exhaust pipe 17 between a lower position at a predetermined distance from the lower end thereof and an upper end position thereof. The baffle plate 17a has a spiral passage extending along the axial direction inside the cylindrical main body. The upper head plate 14 is provided with a water supply port 18a of a water supply pipe 18 for supplying water into the hot water storage chamber R1 and a hot water supply port 19a of a water supply pipe 19 for taking out the hot water in the hot water storage chamber R1 to the outside. A water supply pipe 18 and a hot water supply pipe 19 that are suspended in the hot water storage chamber R1 are connected to the hot water supply port 18a and the hot water supply port 19a. Further, a water drainage plug 19b for discharging hot water in the hot water storage chamber R1 to the outside is provided slightly above the lower head plate 16.

In the combustion chamber R2, a base plate 21 is provided slightly away from the base portion 15, and a main burner 22 is erected on the base plate 21. Main burner 2
2 is connected to a gas supply pipe 23 penetrating the side wall of the main body 11. A pilot burner 25 is provided on a side of the main burner 22. Further, a thermocouple 2 for detecting a change state of the flame is provided on a side portion of the pilot burner 25.
6 are provided.

The base portion 15 is provided with an air supply port 15a at a position below the base plate 21. A flame arrestor 27, which is a flame-shielding device, is placed over the air supply port 15a to cover the base portion 15. Fixed. Flame arrester 27
Is a metal plate having a large number of fine holes having a diameter of 1.5 to 3 mm, and for example, a lath net, a punching metal, or a laminate of these is used. In addition, about the flame arrester 27, you may connect an air supply pipe to the air supply port 15a, and may interpose it in an air supply pipe.

Further, an air supply port 1 is provided on the lower surface of the base portion 15.
A cover member 28, which is a substantially cylindrical cover and surrounds 5a, protrudes from the lower surface of the base 15 and is attached. Lid member 2
8 is provided with an opening in a horizontal plane portion, and a circular dust filter 29 is fixed to the lid member 28 so as to cover this opening. The dust filter 29 is a metal plate having a large number of fine holes having a diameter of about 4 mm. For example, a lath net, a punching metal, or a laminate of these is used. The attachment position of the dust filter 29 is not limited to this, and may be provided in an air supply path for supplying outside air to the frame arrester 27.

The outer peripheral portion and the upper portion of the main body 11 are covered by an outer case 30 via a heat insulating material. The cylindrical portion in the outer case 30 extends from the upper end to the substantially upper end position of the lower head plate 16 so as to have the heat insulating material 31 made of polyurethane resin.
The lower portion is a glass fiber heat insulating material 32 made of a material obtained by mixing fiberglass with resin. An annular plate-shaped upper plate 33 is embedded in the polyurethane resin portion on the upper surface of the outer case 30, and a hood 34 that covers the end of the exhaust pipe 17 protruding from the upper surface is attached. .

The glass fiber heat insulating material 32 is provided in the lower mirror portion 1 in a predetermined range including the ventilation hole 12a of the cylindrical portion 12.
6, the lower part has been removed and the outer case 30 has been removed.
Is a space S2. The outer case 30 has a ventilation hole 35 facing the space S2 and through which outside air flows.
Is provided. The outside air flowing into the space S2 further flows into the ventilation chamber S1 through the ventilation holes 12a.

A controller 41 is provided at an outer peripheral position of a lower end of the heat insulating material 31 of the outer case 30. On the side of the controller 41, a thermostat 42 is provided for the heat insulating material 31.
And it penetrates cylindrical part 12 and is protruded and arranged in hot water storage room R1. Further, a solenoid valve for opening and closing the passage to the pilot burner 25 and the main burner 22 is built in the controller 41, and the thermocouple 26 is also connected to the controller 41.
It is connected to the. The controller 41 has a built-in thermostat valve that closes the main gas passage when the detected temperature of the thermostat 42 becomes equal to or higher than a predetermined value T1, stops the gas supply to the main burner 22, and sets the detected temperature to a predetermined value T2 (<T1 ) When the temperature falls below, the thermostat valve is opened to start gas supply to the main burner 22,
Start combustion.

Further, when the output of the thermocouple 26 falls below a predetermined value due to misfire of the pilot burner flame, the controller 41 sends the pilot burner 2 to the gas supply pipe 23.
The gas supply to the main burner 22 and the pilot burner 25 is stopped by closing the gas passage to 5, thereby preventing the occurrence of an accident due to the release of raw gas.

Next, the operation of the above embodiment will be described. First, the pilot burner 25 is ignited while pressing the ignition knob 41a at the top of the controller 41 downward. Thermocouple 26 heated by pilot burner 25
An electromotive force is generated, and the built-in electromagnetic valve is held in an open state by suction (at this point, the hand is once released from the knob). Further, when the ignition knob is turned to the left to open the main gas passage, the main burner 22 is ignited and the combustion operation is started.
By starting the operation of the water heater 10, the ignition of the flame of the pilot burner 25 is detected by the thermocouple 26.
Here, the ventilation holes 3 of the outer case 30 are inserted into the combustion chamber R2.
5 flows into the space S2 through the air holes 12 and
a, the air flows into the ventilation chamber S1, passes through the dust filter 29 and the frame arrester 27, and the outside air is introduced.

By the start of the combustion operation, high-temperature exhaust gas rises in the exhaust pipe 17 while heating the lower head plate 16, and the exhaust gas passes through the baffle plate 17a, so that the hot water storage chamber R1 is heated.
Heat is exchanged with the hot water inside, and the hot water is heated and its temperature rises. When the hot water temperature exceeds T1, the thermostat 42
Detects this, the thermostat valve is closed, and the main burner 22 extinguishes. When the temperature of the hot water drops or the hot water is discharged through the hot water supply pipe 19 and the water is replenished by water supply from the water supply pipe 18 and the temperature of the hot water falls below T2, the temperature drop is detected by the thermostat 42 and the main gas passage is detected. Is opened by opening the thermostat valve, the combustion by the main burner 22 is started again, and the hot water in the hot water storage room R1 is heated.

In the present water heater, clean air from which large dust contained in the outside air has been removed can be sent out to the flame arrester 27 by the dust filter 29 provided on the upstream side of the flame arrester 27.
That is, since the large dust contained in the outside air is first removed by the dust filter 29, the clogging of the flame arrester 27 is relatively delayed. Further, since the dust removing filter 29 is provided horizontally below the main burner 22, the accumulated dust can be dropped downward by its own weight, so that the clogging of the dust removing filter 29 can be further delayed. Therefore, the clogging of the flame arrester 27 can be greatly delayed as compared with the related art, and the trouble of cleaning can be relatively reduced, and the possibility of carbon monoxide poisoning due to the clogging of the flame arrester 27 is reduced. Can be done.

Next, a second embodiment will be described with reference to FIG. In the present embodiment, the flame arrester and the dust filter are disposed vertically on the side wall of the combustion chamber. That is, as shown in FIG.
The main burner 22 is placed on the bottom plate portion 13 of the first
An opening 51 was provided in the vicinity of the bottom plate portion 13 of 2, and a frame arrester 52 was attached to the cylindrical portion 12 so as to cover the opening 51. Further, an opening 53 is provided slightly above the opening 51 of the outer case 30 surrounding the cylindrical portion 12,
The dust filter 54 is attached to the outer case 30 so as to cover the outer case 3. Thus, the outside air sequentially passes through the dust removal filter 54 and the flame arrester 52 and flows into the combustion chamber R2.

In this embodiment, the flame arrester 52 and the dust filter 54 are disposed vertically on the side wall of the combustion chamber R2, so that the combustion chamber R2
Even if combustion products such as drains generated inside fall down, it is difficult to adhere to the flame arrester 52. Further, a dust filter 5 provided upstream of the frame arrestor 52 is provided.
By 4, clean air from which large dust contained in the outside air has been removed is sent to the flame arrester 52. Therefore, the flame arrester 52 is connected to the combustion chamber R2.
Since clogging factors from inside and outside are alleviated, clogging of the frame arrester 52 is greatly delayed as compared with the related art. Therefore, the labor for cleaning the frame arrester 52 is greatly reduced.

Next, a third embodiment will be described with reference to FIG. In the present embodiment, the dust filter is constituted by two sheets, and the openings of the dust filters are not overlapped in the facing direction. That is, as shown in FIG. 3, the main burner 22 is placed on the bottom plate 13 of the main body 11, an opening 61 is provided near the bottom plate 13 of the cylindrical portion 12, and a frame arrestor is provided on the cylindrical portion 12 so as to cover the opening 61. 62 was attached. Further, the cylindrical portion 12
An opening 63 is provided slightly above the opening 61 of the outer case 30 surrounding the outer case 30, and covers the opening 63 to cover the outer case 3.
The first filter 64a is attached to the outer case 30, and the second filter 64b, which is a separate member, is attached to the outer case 30 outside the first filter 64a. First filter 64a and second filter 6
4b are opposed to each other in parallel with each other, and the small holes of the first filter 64a and the small holes of the second filter 64b are arranged so as not to be projected (to face each other). Thus, the outside air flows through the second filter 64b and the first filter 64a of the dust removal filter 64 and the flame arrester 62 sequentially and flows into the combustion chamber R2.

In the present embodiment, first, the second upstream side
A large amount of dust is removed by the filter 64b, and the dust that has passed through the small holes hits the first filter 64a on the downstream side, so that the two filters 64a and 64b can remove large dust more efficiently. In addition, since the upstream second filter 64b where dust tends to be clogged is detachable, the upstream second filter 64b where dust tends to accumulate can be removed and cleaning can be performed efficiently. In addition, the dust elimination filter 64 provided on the upstream side of the frame arrester 62 allows the clean air from which large dust contained in the outside air has been removed to be sent out to the frame arrester 62, thereby delaying the clogging of the frame arrester 62. be able to. Further, similarly to the second embodiment, the flame arrester 62 and the dust filter 64 are disposed vertically on the side wall of the combustion chamber R2, so that combustion products such as drain generated in the combustion chamber R2 can be generated. Even if it falls, it does not easily adhere to the frame arrester 62. Therefore, the labor for cleaning the frame arrester 62 is greatly reduced.

In the case of using two dust removal filters and arranging them so as to be parallel to each other and arranging the small holes of each filter so as not to overlap in the opposite direction,
Like the dust filter shown in the first embodiment,
The present invention can also be applied to a case where the device is arranged horizontally.

In each of the above embodiments, a heating means for heating the dust filter and maintaining the temperature at a high temperature of about 200 ° C. or more can be provided. This allows
The dust adhering to the dust filter is easily decomposed and removed by heating, so that an automatic cleaning effect of removing the dust by the dust filter can be obtained, and the dust filter can be hardly clogged. As a result, the time and effort for cleaning the dust filter can be reduced, the clogging of the frame arrester can be further delayed, and the time and effort for cleaning can be significantly reduced.

Further, in each of the above embodiments, the dust filter and the frame arrester are provided separately from each other, but they may be integrated and detachable from each other. Thereby, both can be attached and detached to the water heater at a time,
Assembly work can be simplified. Further, each cleaning can be easily performed. In addition, what is shown in each of the above embodiments is merely an example, and various changes can be made without departing from the spirit of the present invention.

[0033]

According to the first aspect of the present invention, the clean air from which large dust contained in the outside air has been removed can be sent out to the flame-shielding device by the dust-removing filter. The clogging of the flame device can be greatly delayed, and the trouble of cleaning the flame shield device can be reduced. In addition, the dust filter is provided horizontally below the burner, and the accumulated dust is dropped by its own weight, whereby the clogging of the dust filter can be delayed, and the trouble of cleaning them can be reduced. (The effect of the invention of claim 2).

In addition, by arranging the flame shield device and the dust filter vertically on the side wall of the combustion chamber, the clogging of the flame shield device from inside and outside the combustion chamber can be suppressed. Can significantly reduce the time and effort required for cleaning (the effect of the invention of claim 3). In addition, since the flame filter and the dust filter are integrally formed and detachable from each other, the dust filter and the flame filter can be easily handled, and the dust can be easily cleaned. The invention's effect).

Further, since the dust filter is substantially made up of two filters so that large dust can be removed more reliably, the flame shield device can be made more difficult to be clogged, and the cleaning work can be greatly reduced. Can be reduced to Furthermore, since at least the dust collecting filter on the upstream side where dust is more likely to be clogged is removable, the clogged dust can be efficiently cleaned (the effect of the invention of claim 5). In addition, the dust removing filter can be maintained at a high temperature by the heating means, and large dust clogged in the dust removing filter can be automatically removed, so that the dust removing filter is less likely to be clogged, and the trouble of cleaning the filter is reduced. (Claim 6
Effect of the invention).

[Brief description of the drawings]

FIG. 1 is a front sectional view schematically showing a water heater with a flame arrestor according to a first embodiment of the present invention.

FIG. 2 is a sectional view showing a main part of a water heater with a flame arrestor according to a second embodiment.

FIG. 3 is a sectional view showing a main part of a water heater with a flame arrestor according to a third embodiment.

FIG. 4 is a front sectional view schematically showing a conventional water heater with a flame arrester.

[Explanation of symbols]

10 ..., 11 ... body, 12 ... cylindrical part, 12a ... vent hole,
13 bottom plate part, 15 base part, 22 main burner, 2
7: Frame arrester, 28: Lid member, 29: Dust filter, 30: Outer case, 35: Vent, 51, 5
Reference numeral 3 denotes an opening, 52 denotes a frame arrestor, 54 denotes a dust filter, 61 and 63 denotes an opening, 62 denotes a frame arrestor, 64 denotes a dust filter, 64a denotes a first filter, and 6 denotes a dust filter.
4b: second filter, R1: hot water storage chamber, R2: combustion chamber.

Claims (6)

[Claims] 1. A combustion chamber for introducing outside air from a supply port into a substantially airtight chamber and discharging a combustion gas generated by combustion of a burner provided in the chamber from an exhaust port. In a water heater with a flame shield device provided in a mouth or an air supply passage for guiding outside air to the air supply port, a dust filter is provided upstream of the flame shield device. Water heater with device. 2. The hot water supply with a flame-shielding device according to claim 1, wherein the flame-shielding device is disposed substantially horizontally, and the dust filter is provided substantially horizontally below the burner. vessel. 3. The water heater with a flame-shielding device according to claim 1, wherein the flame-shielding device and the dust filter are arranged vertically on a side wall of the combustion chamber. 4. The flame-shielding device and the dust removal filter are integrally formed, and the flame-shielding device and the dust removal filter are detachable from each other. Item 2. The water heater with a flame shield device according to item 1. 5. The filter according to claim 1, wherein said dust removing filters are opposed to each other.
2. The filter according to claim 1, wherein the filter comprises a plurality of filters, and the openings of the respective dust filters are arranged so as not to overlap in a projected manner, and at least the upstream dust filter is detachable. The water heater with a flame shield device according to any one of claims 1 to 4. 6. The water heater with a flame-shielding device according to claim 1, further comprising a heating means for keeping the dust filter at a high temperature.