JP5600561B2 - Water heater - Google Patents

Description

  The present invention relates to a hot water supply apparatus that recovers latent heat of exhaust gas to improve efficiency.

  Conventionally, in this type, for example, in a direct pressure hot water supply apparatus that uses hot water pressure as it is, a main heat exchange unit is provided above the burner unit, downstream of the main heat exchange unit, In other words, there is an auxiliary heat exchanger that recovers the latent heat of the exhaust gas and an exhaust passage through which the exhaust gas flows, and a silencer that is provided in the exhaust passage upstream of the auxiliary heat exchanger. (For example, Patent Document 1)

JP 2008-2700 A

  By the way, in this conventional type, a hot water storage part is not necessary because it is a direct pressure type, and a main heat exchange part, a sub heat exchange part, and an exhaust passage are provided in the apparatus main body, and an exhaust passage upstream of the sub heat exchange part is provided. Although the equipment main body did not become very large even if a silencer was provided, in the hot water storage type water heater, there is a hot water storage part in the equipment main body, so in addition to the hot water storage part that is also the main heat exchange part in the equipment main body, If a heat exchange part and an exhaust flow path are provided, and if a sound deadening part is provided in the exhaust flow path upstream of the auxiliary heat exchange part, there is a problem that the device main body becomes large.

This invention pays attention to this point and solves the above-mentioned problems. In particular, the structure is composed of a combustion chamber in which a burner is disposed, and a heat exchange pipe that is disposed above the combustion chamber and through which combustion gas passes. In a water heater provided with a body part and a muffler part and a sub heat exchanger part above the can body part, the muffler part and the sub heat exchanger part are arranged in parallel in the lateral direction and integrated A muffler auxiliary heat exchanger unit configured is provided , the muffler unit includes a muffler in the middle and a substantially square-shaped muffler exhaust passage is formed, and the sub heat exchanger unit has a meandering plate provided in the middle. The secondary heat exchanger pipe is formed along the heat recovery exhaust passage .

According to this inventions, since there is provided a muffler sub heat exchanger unit configured integrally with silencer and auxiliary heat exchanger unit upward and laterally disposed in parallel can body portion, a hot water supply of the hot water storage type Even if the auxiliary heat exchanger portion is provided in the apparatus, the size, particularly the height of the hot water supply apparatus can be reduced.
In addition, the silencing sub heat exchanger section is provided with a silencing section upstream of the exhaust passage and a sub heat exchanger section downstream of the silencing section, so that the sound velocity is high at high temperature upstream and the wavelength is short even at the same frequency. The combustion gas can be silenced efficiently with a small silencer, and further, the latent heat and sensible heat are absorbed from the high-temperature combustion gas by being silenced downstream to improve the thermal efficiency of the hot water supply device. The water can be neutralized by the neutralizer without corroding the silencer in the silencer with the condensed water generated in the heat exchanger.

BRIEF DESCRIPTION OF THE DRAWINGS Schematic of the hot water supply apparatus which shows one Embodiment of this invention. Sectional drawing of the sound deadening sub-heat exchanger part. Sectional drawing of the sound deadening part. Sectional drawing of the sub-heat exchanger part.

Next, one embodiment of the present invention will be described with reference to the drawings.
Reference numeral 1 denotes a main heat exchanger, a can body part of a hot water supply apparatus formed in a cylindrical shape as a whole, 2 a burner using petroleum fuel provided on the lower side of the can body part 1, and 3 a combustion chamber for performing combustion The combustion chamber 3 is disposed below the can body 1, the burner 2 is disposed on the side of the combustion chamber 3, and the end of the burner 2 is looked into the combustion chamber 3.

The can body 1 stores tap water from a water supply pipe 4 therein, and a plurality of heat exchange pipes 5 constituting a large number of flues are arranged in the can body 1 so that the combustion gas in the combustion chamber 3 is heated. When passing through the exchange pipe 5, heat is exchanged between the high-temperature combustion gas in the heat exchange pipe 5 and the stored water in the can body part 1, and the water in the can body part 1 is heated to high-temperature water, and the can body part Hot water is stored in 1.
The hot water stored in the can body 1 is discharged from the hot water discharge pipe 6 to supply hot water.

  7 is a silencing sub heat exchanger part, which is arranged at the upper part of the can body part 1 and is constructed integrally by arranging the silencing part 8 and the sub heat exchanger part 9 in parallel in the lateral direction. A silencer 8 is disposed on the upstream side, a sub heat exchanger 9 is disposed on the downstream side of the silencer 8, and the combustion gas that has passed through the heat exchange pipe 5 in the can body 1 passes through the silencer 8. By passing through the auxiliary heat exchanger section 9 after being silenced, most of the latent heat and sensible heat of the combustion gas are absorbed and exhausted from the water heater main body through the exhaust port 10.

  The silencer 8 comprises a silencer 11 such as rock wool or glass wool, and a punching guide plate 12 provided with a number of holes. The punching guide plate 12 forms a substantially square-shaped silencer exhaust passage 13, The silencer exhaust passage 13 is filled with a silencer 11.

  The auxiliary heat exchanger section 9 is provided meandering in the auxiliary heat exchanger section 9, a water inlet 14 is provided in the upper portion of the auxiliary heat exchanger section 9, and the lower portion in the auxiliary heat exchanger section 9 is provided. The secondary heat exchange pipe 16 provided with the outlet 15, the fin-like secondary heat exchange baffle 17 provided in the upper part of the sub heat exchanger section 9, and the meandering secondary heat exchange pipe 16 are inclined below. The condensed water that flows from the secondary heat exchanger pipe 16 smoothly flows to the condensed water drain port 18 provided at the bottom of the auxiliary heat exchanger unit 9 and the heat recovery meanders in the auxiliary heat exchanger unit 9 A tray 20 that forms the exhaust path 19 is provided, and an exhaust port 10 is provided downstream of the heat recovery exhaust path 19.

  21 is a neutralizer with a built-in neutralizing agent, and neutralizes strongly acidic condensed water flowing from a condensed water pipe 22 having one end connected to the condensed water discharge port 18 of the auxiliary heat exchanger section 9. is there.

Next, the operation of this hot water supply apparatus will be described.
When a hot water supply faucet (not shown) is opened, the hot water in the can body 1 is discharged from the hot water discharge pipe 6 and the hot water supply operation is started.
At the same time, tap water flows from the water supply pipe 4 into the inlet 14 of the secondary heat exchange pipe 16, passes through the secondary heat exchange pipe 16, and passes through the water supply pipe 4 from the outlet 15 of the secondary heat exchange pipe 16. It flows into the can body part 1 through.

  Then, the temperature of the hot water in the can body 1 gradually decreases, and this is detected by a temperature sensor (not shown). The fuel is burned in the burner 2 in the combustion chamber 3, and the combustion gas is burned into the combustion chamber 3. Is passed through the heat exchange pipe 5 in the can body part 1, and at that time, heat is exchanged between the high-temperature combustion gas in the heat exchange pipe 5 and the stored water in the can body part 1. Water is heated.

The combustion gas that has passed through the heat exchange pipe 5 and has absorbed the sensible heat in the can body 1 flows into the silencer 8 of the silencer auxiliary heat exchanger 7 from the heat exchange pipe 5.
The combustion gas that has flowed into the silencer 8 is still high in temperature, has a high sound speed, and has a short wavelength even at the same frequency. Therefore, by arranging the silencer 8 upstream of the auxiliary heat exchanger 9, the small volume silencer 8 But it can effectively mute low frequencies.
Further, by disposing the silencer 8 on the upstream side of the auxiliary heat exchanger 9, the temperature has not yet decreased so that the combustion gas generates condensed water, and corrosion of the silencer 11 due to condensed water can be prevented. It is.

The combustion gas that has passed through the silencer 8 flows into the auxiliary heat exchanger 9 of the silencer auxiliary heat exchanger 7.
The combustion gas flowing into the auxiliary heat exchanger section 9 passes through the meandering heat recovery exhaust passage 19 in the auxiliary heat exchanger section 9 and is exhausted from the exhaust port 10 to the outside of the hot water supply apparatus.
At this time, heat is exchanged with the tap water flowing in the secondary heat exchange pipe 16 disposed in the heat recovery exhaust passage 19, and the tap water flowing into the can body 1 is heated.

Here, the combustion gas after heat exchange in the secondary heat exchange pipe 16 becomes low temperature, and condensation may occur in the heat recovery exhaust passage 19.
If the silencer 8 is disposed in the exhaust path after heat exchange in the auxiliary heat exchanger unit 9, the silencer 11 of the silencer 8 may be corroded by strongly acidic condensed water. However, the auxiliary heat exchanger unit 9 By disposing the silencer 8 in the upstream exhaust path, corrosion of the silencer 11 due to condensed water can be prevented.

  As described above, the silencer 8 and the auxiliary heat exchanger 9 are integrally provided in the lateral direction on the upper portion of the can body 1, thereby reducing the size, particularly the height of the water heater, Since the silencer 8 is disposed upstream of the exhaust passage and the auxiliary heat exchanger 9 is disposed downstream, the silencer of the combustion gas having a high sound velocity at a high upstream temperature and a short wavelength even at the same frequency is smallly silenced. It can be efficiently performed in the section 8, and further, most of the latent heat and sensible heat is absorbed from the high-temperature combustion gas that is silenced downstream to improve the thermal efficiency of the hot water supply apparatus. The generated condensed water can be neutralized by the neutralizer 21 without corroding the silencer 11 of the silencer 8.

DESCRIPTION OF SYMBOLS 1 Can body part 2 Burner 3 Combustion chamber 5 Heat exchange pipe 7 Silent auxiliary heat exchanger part 8 Silent part 9 Sub heat exchanger part

Claims (1)

A combustion chamber in which a burner is disposed; a can body portion that is located above the combustion chamber and in which a heat exchange pipe through which combustion gas passes is disposed; and a muffler portion and a sub heat exchanger portion above the can body portion; In the hot water supply apparatus provided with the above, the silencing part and the auxiliary heat exchanger part are arranged in parallel in the lateral direction to provide a silencing auxiliary heat exchanger part, and the silencing part has a silencing material in the middle. A substantially B-shaped muffled exhaust path is formed, and the sub heat exchange part is formed with a secondary heat exchange pipe along a meandering heat recovery exhaust path with a receiving part in the middle. Hot water supply device.

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