JP2013032882A - Storage type heat exchanger - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a storage type heat exchanger preventing the generation of gap corrosion and boiling sound.SOLUTION: The storage type heat exchanger has a hot water can body 27 comprising an outer can 28 and an inner can 29 storing hot water and a burner part 26 in the bottom part of the hot water can bottle 27 such that the hollow part of the center of the hot water can body 27 is a combustion chamber 30 and has an inner can ring 31 continuously connected to the inner can 29 in the lower end of the hot water can body 27 and a part in which hot air of the burner part 26 acts and a partitioning plate 34 in which a step part 33 is formed by making an upper part overhang to the burner part 26 in the lower part of the inner can ring 31 and further has a first heat insulation material 35 and a second heat insulation material 36 blocking the hot air from the burner part 26 in an upper and lower parts of the step part 33 of the partitioning plate 34, a ring-shape third heat insulation material 37 is arranged in the burner part 26 side of the first and second heat insulation materials 35, 36, thereby the gap corrosion and the boiling sound can be surely prevented.

Description

  The present invention relates to a hot water storage type heat exchanger in which hot water stored in a hot water can body is heated by a burner portion provided at a lower portion to perform hot water supply or hot water heating.

  Conventionally, in this type, a combustion chamber with a burner facing the lower portion of the hot water can body is formed, and the combustion chamber is covered with a heat insulating material, and between the upper end of the combustion chamber and the lower end of the hot water can body. In addition, a heat insulating material was provided to prevent localized abnormally high temperatures. (See Patent Document 1)

Japanese Patent Laid-Open No. 10-197071

  By the way, with this conventional one, there is a welded part at the lower end of the hot water can body in particular, and if this part is overheated, it becomes a problem of generating crevice corrosion and boiling noise, so it becomes hot due to flame contact and heat transfer. Insulation at the lower end of the easy-to-use hot water can body requires special arrangements and devices such as the arrangement of heat insulating materials, but nothing has been done.

  This invention pays attention to this point and solves the above-mentioned problems. In particular, the structure is composed of a hot water can body composed of an outer can and an inner can for storing hot water, and a hollow portion at the center of the hot water can body as a combustion chamber. As described above, a portion having a burner portion at the bottom of the hot water can body is provided with an inner can ring connected to the inner can at the portion where the hot air of the burner portion hits at the lower end of the hot water can body. A partition plate having a step portion formed by projecting an upper portion toward the burner portion at a lower portion of the can ring, and a first heat insulating material and a second heat shield that block hot air from the burner portion above and below the step portion of the partition plate. A heat insulating material is provided, and a ring-shaped third heat insulating material is provided on the burner portion side of the first and second heat insulating materials.

  As described above, according to the present invention, the first heat insulating material sandwiched and fixed between the inner can ring and the partition plate at the lower end of the hot water can that the hot air from the burner unit hits, the partition plate and the burner cover Since the second heat insulating material sandwiched between and fixed and the third heat insulating material provided in front of the first and second heat insulating materials, the hot air directly hits the welded portion of the lower end of the hot water can body. The generated crevice corrosion and boiling sound can be reliably prevented, and the first and second heat insulating materials are fixed by the partition plates, respectively, so that the lower end of the hot water can body is well insulated. At the same time, hot air can be smoothly guided upward, and good heating can always be obtained.

Explanatory drawing of the combustion apparatus used for the hot water storage type heat exchanger of this invention. Explanatory drawing of the principal part of the hot water storage type heat exchanger using the combustion apparatus.

Next, a combustion apparatus used in the hot water storage type heat exchanger of the present invention will be described with reference to FIG.
Reference numeral 1 denotes a bottomed cylindrical vaporization cylinder in which a sheathed heater 2 for heating the inside thereof to a vaporizable temperature of fuel is embedded, and the vaporized fuel and combustion air are mixed in advance to form a premixed gas. A pot thermistor 3 for detecting the temperature of the vaporizing cylinder 1 is provided at the bottom of the vaporizing cylinder 1, and the energization control of the sheathed heater 2 is performed so that the temperature detected by the pot thermistor 3 is maintained at a predetermined temperature. Is what you do.

  Reference numeral 4 denotes a nozzle holder, which is provided with a combustion air port 5 for supplying combustion air into the vaporizing cylinder 1 and a secondary air port 6 for supplying secondary air. A fuel supply nozzle 7 for injecting fuel is disposed inside, and the combustion air port 5 is inserted into and fixed to an insertion port 8 formed below the side wall of the vaporizing cylinder 1 so as to supply the fuel. The nozzle 7 is faced inside the vaporizing cylinder 1.

  Reference numeral 9 denotes a burner mounting base, in which a vent hole 10 is formed substantially at the center of the plate-shaped mounting surface, and the secondary air port 5 of the nozzle holder 3 is close to the vent hole 10 and has a smaller diameter than the vent hole 10. A secondary air hole 11 to be connected is formed.

  Reference numeral 12 denotes a bottomed cylindrical burner case, which is provided with a screw (not shown) on the burner mounting base 9 so that the vaporizing cylinder 1 is provided and its opening is positioned below the vent hole 10 of the burner mounting base 9. Further, a pot packing (not shown) is interposed between the vaporizing cylinder 1 and the burner mounting base 9 and fixed in close contact.

Reference numeral 13 denotes a bottomed cylindrical burner head, which is disposed on the upper portion of the vent hole 10 of the burner mounting base 9 as a top surface with the bottom side facing up, and a plurality of flame holes 14 are formed on the peripheral wall at substantially equal intervals. Is,
Reference numeral 15 denotes a rectifying cylinder, which is formed by integrally narrowing a central opening portion downward.

  A burner head ring 16 is arranged so as to cover the flame hole 14 in a ring shape from the lower periphery of the burner head 13. The burner head ring 16 is fixed to the burner mounting base 9 together with the burner head 13 with screws. The vaporization cylinder 1 is heated back by being heated by the flame formed in the hole 14.

  A burner cover 17 has one end communicating with a heat exchanger (not shown), and the other end attached to the burner head 13 and the vaporizing cylinder 1 so that the burner head 13 is located at the approximate center in the cylinder. A base 9 is attached, and a spark plug 18 that ignites premixed gas jetted from the burner head 13 and a frame rod 19 that detects a flame state are fixed so as to face the burner cover 17.

20 is a constant oil level device that stores a certain amount of fuel that has passed through the oil filter 21, and the fuel is pumped into the vaporizing cylinder 1 from the tip of the fuel supply nozzle 7 via the communication vibrator 23 by the oil amount pump 22. It is a eruption.
A blower 24 supplies air from the combustion air port 5 to the nozzle holder 4 and from the secondary air port 6 into the burner case 12.

Next, the combustion operation of this combustion apparatus will be described.
First, when the operation of the combustion apparatus is started, the sheathed heater 2 is energized and the vaporizing cylinder 1 is heated to a predetermined temperature which is a preset vaporizable temperature.

  When the vaporizing cylinder 1 reaches the set temperature, the pot thermistor 3 detects this, and the fuel is injected from the fuel supply nozzle 7 into the vaporizing cylinder 1 to instantly vaporize, and the combustion air port 5 of the nozzle holder 4 is also injected. By supplying combustion air into the vaporizing cylinder 1 from above, the fuel vaporized gas and the combustion air are premixed in the vaporizing cylinder 1 to become premixed gas.

The premixed gas rises in the vaporizing cylinder 1, flows into the burner head 13 from the rectifying cylinder 15, and is ejected from the flame hole 14 formed on the side wall of the burner head 13.
When the ignition operation is performed by the spark plug 18, the premixed gas blown out from the flame hole 14 is ignited and forms a flame in the lateral direction from the side wall of the burner head 13 and burns.

Next, FIG. 2 which shows the state which used this combustion apparatus as the burner part 26 of the hot water storage type heat exchanger 25 is demonstrated.
Reference numeral 27 denotes a hot water can body formed by welding an outer can 28 for storing hot water and an inner can 29. The hot water can body 27 is formed at the bottom of the hot water can body 27 so that the hollow portion at the center of the hot water can body 27 serves as a combustion chamber 30. The burner part 26 is attached.

  31 is an inner can ring having a small step portion 32 connected to the lower end of the inner can 29, and a partition plate 34 that protrudes from the lower portion of the inner can ring 31 toward the burner portion 26 to form a step portion 33. One end is sandwiched and fixed with the first heat insulating material 35 inserted into the small step portion 32, and the partition plate 34 is further fixed with the second heat insulating material 36 sandwiched between the upper surface of the lower burner cover 17. Further, on the burner portion 26 side of the first and second heat insulating materials 35 and 36, a third heat insulating material 37 is provided upright in a ring shape so as to block the hot air from the burner portion 26. .

  Next, the operation of the hot water storage type heat exchanger 25 will be described. When the burner portion 26 burns as described above, the hot air generated vigorously from the flame holes 14 of the burner head 13 is generated from below. In order to heat the hot water can body 27, it tries to enter the welded portion at the lower end of the hot water can body 27. Here, the first heat insulating material 35 already sandwiched between the inner can ring 31 and the partition plate 34 and fixed, and Since the second heat insulating material 36 sandwiched and fixed between the partition plate 34 and the burner cover 17 is provided, hot air does not enter the welded portion at the lower end of the hot water can body 27 and reliably prevents corrosion and boiling noise. It can be prevented.

  Further, since the third heat insulating material 37 is erected in a ring shape on the burner portion 26 side of the first and second heat insulating materials 35, 36, the hot air is guided and guided by the third heat insulating material 37 to The hot water can be heated efficiently from the bottom of the can body 27 in order and the hot water in the hot water can body 27 can be instantly heated to a high temperature, and this high temperature water is used for hot water supply, bathing or heating.

26 Burner portion 27 Hot water can body 28 Outer can 29 Inner can 30 Combustion chamber 31 Inner can ring 33 Step portion 34 Partition plate 35 First heat insulating material 36 Second heat insulating material 37 Third heat insulating material

Claims (1)

  A hot water can body comprising an outer can and an inner can for storing hot water, and a hot water can body provided with a burner at the bottom of the hot water can body so that the hollow portion at the center of the hot water can body serves as a combustion chamber, At the lower end of the hot water can body, the part where the hot air of the burner part hits is provided with an inner can ring connected to the inner can, and at the lower part of this inner can ring, a partition is formed by projecting the upper part toward the burner part And a first heat insulating material and a second heat insulating material that block hot air from the burner portion above and below the stepped portion of the partition plate, and on the burner portion side of the first and second heat insulating materials, A hot water storage type heat exchanger characterized by providing a ring-shaped third heat insulating material.

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