JP2001324222A - Hot water supply apparatus with flame shielding device - Google Patents

Abstract

PROBLEM TO BE SOLVED: To prevent the occurrence of choking of a flame shielding device due to a combustion product, such as drain, generated by combustion of gas, in a hot water supply apparatus with a flame shielding device. SOLUTION: The hot water supply apparatus is formed that a hot water storage chamber R1 and a combustion chamber R2 are disposed at the inner upper and inner lower parts of a body 11 being a hollow container. The combustion chamber is provided at an internal part with an air supplying opening through which air is supplied to an internal part and an exhaust pipe 16 running through the hot water storage chamber and opened to the upper part of the body and discharging exhaust gas in the combustion chamber to the outside. A flame arrester 27 is situated in the air supplying opening 13a of a horizontal bottom plate part 13 of the combustion chamber. Further, a drop preventing means is provided to prevent a drop of a combustion product to the frame arrester from above. Annulus ring-shaped or circular support members 29 and 51 to receive the combustion product are situated below an exhaust opening as the drop preventing means. Further, a support member 52 is situated as the drop-preventing member 52 in a manner to almost cover a space above the flame arrester.

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, 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 as shown in FIG. 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. 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 combustible gas has a quenching distance that the flame does not propagate in gaps below that,
Flame arrestor 6 uses this,
The size of the opening is a minute shape such as 1.5 to 3 mm.

[0003]

However, since the opening of the flame arrester 6 is small as described above, the flame arrestor 6 is easily clogged with combustion products such as drain generated by gas combustion. As described above, when the flame arrester 6 is clogged with the combustion products, an incomplete combustion state of the burner 3a occurs due to a shortage of air supply in the combustion chamber 3, and accordingly, the room around the water heater becomes carbon monoxide gas. , And there is a possibility that indoor persons and the like may be damaged by carbon monoxide poisoning and the like. Therefore, an object of the present invention is to solve the above-mentioned problem, and an object of the present invention is to provide a water heater with a flame-shielding device that can prevent clogging of the flame-shielding device by a combustion product such as drain generated by gas combustion. And

[0004]

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, With a flame-shielding device having a combustion chamber for discharging combustion gas from combustion of a burner provided in the chamber from an exhaust port, and having a flame-shielding device in the air supply passage or an air supply passage for introducing outside air to the air supply opening In the water heater, the flame shield device is disposed horizontally below the burner, and furthermore, a fall prevention unit for preventing the combustion products from falling from above to the flame shield device is provided.
Thereby, clogging of the flame shield device due to combustion products can be avoided.

According to a second aspect of the present invention, in the water heater with a flame shield device according to the first aspect, the combustion product is received below the exhaust port as a fall prevention means. That is, the annular receiving member is provided.

According to a third aspect of the present invention, there is provided the water heater with a flame shield device according to the first or second aspect, wherein the burner is provided below the exhaust port as a fall prevention means. That is, a circular receiving member for receiving the product is provided.

According to a fourth aspect of the present invention, there is provided the water heater with the flame shield device according to the first aspect, wherein the water heater is provided as a fall prevention means so as to cover almost the upper part of the flame shield device. That is, a member is provided.

[0008]

DESCRIPTION OF THE PREFERRED EMBODIMENTS Next, an embodiment of the present invention will be described with reference to the drawings. FIG. 1 is a front sectional view of a water heater with a flame shield device (hereinafter simply referred to as a water heater) according to the embodiment. This is indicated by. 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 of the water heater 10 includes a cylindrical portion 12,
A bottom plate 13 is a flat plate that closes the lower end, and a spherical upper head plate 14 that is slightly bulged upward and closes the upper end is provided.
It is erected in. The main body 11 is provided with a spherical lower head plate 15 which is coaxially disposed at a predetermined position on the bottom plate portion 13 side and swells upward and slightly swells up and down inside the main body 11. It is divided into an upper hot water storage chamber R1 and a lower combustion chamber R2.

The upper head plate 14 and the lower head plate 15 are provided with openings 14a and 15a at axial positions, respectively.
a, 15a extend in the axial direction at the axial center position,
Exhaust pipe 16 forming an exhaust passage penetrating through 4a and 15a
Has been fixed. Further, a twisted plate-shaped baffle plate 17 is fixed in the exhaust pipe 16 between an upper end position and a lower position slightly distant from the lower end 16a.
The baffle plate 17 has a spiral passage extending along the axial direction inside the cylindrical main body. The upper end plate 14 has 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 1 of a water supply pipe 19 for taking out the hot water in the hot water storage chamber R1 to the outside.
9a is provided, and a water supply port 18a and a hot water supply port 19a are provided.
Has a water supply pipe 18 and a hot water supply pipe 1 suspended in a hot water storage room R1.
9 is connected. Further, a water drain plug 19b for discharging the hot water in the hot water storage room R1 to the outside is provided slightly above the lower end plate 15.
Is provided.

In the combustion chamber R2, a base plate 21 is provided slightly away from the bottom plate portion 13, and a main burner 22 stands 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.

An air supply port 13a is provided at a position below the base plate 21 of the bottom plate portion 13. A flame arrestor 27, which is a flame-shielding device, is covered by the air supply port 13a.
It is fixed to. The diameter of the frame arrestor 27 is φ
It is a metal plate having a large number of small holes of 1.5 to 3 mm. For example, a lath net, a punching metal, or a laminate of these is used.

In the combustion chamber R 2, the lower end 1 above the main burner 22 and the exhaust port of the exhaust pipe 16.
Slightly below the opening 6a, an annular flat container-shaped receiving member 29, which is a fall prevention means, is provided. The combustion of the gas in the main burner 22 causes gas components and moisture in the exhaust gas to react with the tube wall of the exhaust pipe 16 and the inner wall of the combustion chamber R2, thereby producing combustion products such as drains. Especially tends to occur mainly on the inner surface of the exhaust pipe 16, and the receiving member 29 receives and stores these combustion products.

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 has a portion between the upper end and the substantially upper end position of the lower head plate 15, 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 16 protruding from the upper surface is attached. .

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. The controller 41 includes a thermosensitive part 42 of the thermostat,
1 and the cylindrical portion 12 so as to protrude into the hot water storage chamber R1. A solenoid valve for opening and closing the passages to the pilot burner 25 and the main burner 22 is built in the controller 41, and the thermocouple 26 is
1 connected. The controller 41 also has a built-in thermostat valve that closes the main gas passage when the detected temperature of the thermostat becomes equal to or higher than a predetermined value T1.
The gas supply to the main burner 22 is stopped, and when the detected temperature becomes equal to or lower than a predetermined value T2 (<T1), the thermostat valve is opened to start gas supply to the main burner 22 and start combustion.

Further, when the output of the thermocouple 26 falls below a predetermined value due to misfire of the pilot flame, the controller 41 closes the gas passage to the gas supply pipe 23 and the gas passage to the pilot burner 25, and The supply of gas to the fuel burner 22 and the pilot burner 25 is stopped so that an accident due to leakage of raw gas can be dealt with.

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 such a water heater, the pilot burner 2
The ignition of the flame No. 5 is detected by the thermocouple 26.

The high temperature exhaust gas from the combustion rises in the exhaust pipe 16 while heating the lower head plate 15, and the exhaust gas passes through the baffle plate 17, so that the hot water in the hot water storage chamber R1 is heated and the temperature thereof is reduced. To rise. When the hot water temperature becomes equal to or higher than T1, the thermostat 42 detects this, closes the thermostat valve, and the main burner 22 extinguishes fire. 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.

During the repetitive heating of the hot water storage chamber R1 by the combustion of the main burner 22, gas components and moisture in the exhaust gas react with the pipe wall of the exhaust pipe 16 and the inner wall of the combustion chamber R2. , Drain and the like, and these combustion products peel off from the wall surface and fall, but are efficiently received by the receiving member 29 disposed below the exhaust pipe 16,
The falling down can be prevented. Therefore bottom plate 1
3 can be prevented from being clogged by combustion products. As a result, the trouble of cleaning the clogged flame arrester 27 due to combustion products can be saved.

Next, a modification of the above embodiment will be described. In the first modification, as shown in FIG. 2, a lower end 16 a of the exhaust pipe 16 above the main burner 22 in the combustion chamber R <b> 2 is used as a fall-preventing receiving member.
Slightly below the opening, a circular flat container-shaped receiving member 51 as a fall prevention means is provided. Thus, the combustion products that are separated from the wall surface of the exhaust pipe 16 and fall can be efficiently received by the receiving member 51, and can be prevented from falling downward. Therefore, clogging of the flame arrester 27 provided on the bottom plate 13 with combustion products can be prevented and prevented, and the trouble of cleaning can be saved. As a second modification, as shown in FIG. 3, the receiving member 51 can be provided below the receiving member 29.

Next, as shown in FIG. 4, a modified example 3 of the modification 3 includes a lower end 16a which is located above the main burner 22 and is an exhaust port of the exhaust pipe 16 in the combustion chamber R2, as shown in FIG. A curved annular receiving member 52 is provided slightly below the opening and extends radially from the slightly inside of the opening along the curved surface of the lower head plate 15 to the vicinity of the outer periphery. In other words, the frame arrestor 27 provided on the bottom plate 13 is almost entirely covered by the receiving member 52. Thus, the combustion product that is separated from the wall surface of the exhaust pipe 16 and falls can be received by the receiving member 51 and can be prevented from falling onto the flame arrester 27. Therefore, it is possible to prevent the flame arrester 27 from being clogged with the combustion products, and it is possible to save the trouble of cleaning the combustion products.

The embodiments described above are merely examples, and various modifications can be made without departing from the scope of the present invention.

[0023]

According to the first aspect of the present invention, it is possible to prevent clogging of the flame shield device due to combustible organisms, and to save time for cleaning the flame shield device. Further, by providing an annular or circular receiving member below the exhaust port, it is possible to efficiently receive the fall of the combustion product from the exhaust port side where the combustion product is mainly generated, and the flame shield device. Can be efficiently prevented (effects of the inventions of claims 2 and 3). Further, by providing the receiving member so as to substantially cover the upper part of the flame shield device, it is possible to prevent the combustion products from dropping to the flame shield device, and to save the trouble of cleaning (the invention of claim 4). effect).

[Brief description of the drawings]

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

FIG. 2 is a front sectional view schematically showing a water heater with a frame arrester according to a first modification.

FIG. 3 is a front sectional view schematically showing a water heater with a flame arrestor according to a second modification.

FIG. 4 is a front sectional view schematically showing a water heater with a flame arrestor according to a third modification.

FIG. 5 is a front sectional view schematically showing a conventional water heater with a flame arrestor.

[Explanation of symbols]

10 ... water heater with flame arrestor, 11 ... body, 13
... bottom plate part, 13a ... air supply port, 15 ... lower head plate, 16 ... exhaust pipe, 22 ... main burner, 27 ... frame arrester,
29: receiving member, 51: receiving member, 52: receiving member, R
1: hot water storage chamber, R2: combustion chamber.

Claims (4)

[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 provided with a flame shield device in a mouth or an air supply passage for guiding outside air to the air supply port, the flame shield device is disposed horizontally below the burner, and further from above. A water heater with a flame-shielding device, comprising a fall-preventing means for preventing the combustion products from falling into the flame-shielding device. 2. The water heater with a flame shield device according to claim 1, wherein an annular receiving member for receiving a combustion product is provided below the exhaust port as the fall prevention means. 3. The flame-shielding device according to claim 1, wherein a circular receiving member for receiving a combustion product is provided below the exhaust port as the drop prevention unit. Water heater. 4. The water heater with a flame-shielding device according to claim 1, wherein a receiving member is provided as the fall prevention means so as to substantially cover the upper part of the flame-shielding device.