JP5968798B2 - Latent heat recovery water heater - Google Patents

Description

  The present invention relates to a latent heat recovery type hot water supply apparatus that improves the efficiency by recovering the latent heat of combustion gas.

  Conventionally, in this type, for example, in a direct pressure type 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 combustion gas and an exhaust passage through which the combustion gas flows, and a silencer that is provided in the exhaust passage upstream of the auxiliary heat exchanger. (See 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 hot water supply device, there is a hot water storage part in the equipment main body. If a heat exchanging part and an exhaust flow path are provided, and if a silencer is provided in the exhaust flow path upstream of the auxiliary heat exchanging part, there will be a problem that the main body of the device will become large, and noise that will make combustion noise leak directly Or the problem that the temperature of the combustion gas is high and the exhaust temperature does not decrease because the combustion gas flows from the main heat exchange part to the sub heat exchange part immediately.

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. A body part and a silencing part and a sub heat exchange part provided above the can body part, wherein the silencing part and the sub heat exchange part are arranged in parallel in the lateral direction, and the combustion gas is a can body It passes through the auxiliary heat exchanging part from the part through the auxiliary heat exchanging part, and is exhausted from the exhaust pipe above the silencer part, and between the outlet from the upper part of the auxiliary heat exchanging part to the exhaust pipe, The upper part is communicated with a communication path that is covered with a flat box-shaped flow path, and this communication path is provided so as to be inclined downward from the exhaust tube side toward the outlet.

  As described above, according to the present invention, the silencer and the auxiliary heat exchanging unit are arranged in parallel in the lateral direction above the can body, so the auxiliary heat exchanging unit is provided in the hot water storage type hot water supply apparatus. In addition, the size of the hot water supply device, particularly the height can be reduced, and the combustion gas is subjected to heat exchange for latent heat recovery in the auxiliary heat exchange portion after passing through the muffling portion after circulation of the can body portion. The temperature and combustion noise of the combustion gas flowing into the auxiliary heat exchange section are also suppressed to a low level. Further, between the auxiliary heat exchange section and the exhaust pipe, the upper side of the auxiliary heat exchange section and the muffler section is covered, and the auxiliary heat exchange section is covered. Since the communication passage inclined downward toward the outlet of the heat exchanging section is provided, the exhaust temperature is further lowered, the combustion noise is further suppressed, and good exhaust and noise are prevented. .

BRIEF DESCRIPTION OF THE DRAWINGS Schematic of the latent heat recovery type hot water supply apparatus which shows one Embodiment of this invention. Explanatory drawing of the principal part.

Next, an embodiment of a latent heat recovery type hot water supply apparatus according to the present invention will be described with reference to the drawings.
Reference numeral 1 denotes a main heat exchanger, a can body portion of a latent heat recovery type hot water supply apparatus formed in a tubular shape as a whole, 2 a burner using petroleum fuel provided on the lower side of the can body portion 1, and 3 a combustion 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 exchange part, which is arranged at the top of the can body part 1 and is constructed integrally by arranging the silencing part 8 and the sub heat exchanging part 9 in parallel in the lateral direction, upstream of the exhaust passage. The silencing unit 8 is disposed in the sub-heat exchange unit 9 on the downstream side of the silencing unit 8, and the combustion gas that has passed through the heat exchange pipe 5 in the can body unit 1 passes through the silencing unit 8. By passing through the auxiliary heat exchanging section 9 after being silenced, most of the latent heat and sensible heat of the combustion gas are absorbed, and one side of the silencing section 8 from the outlet 10 on the upper side of the auxiliary heat exchanging section 9 It is discharged to the outside through an exhaust cylinder 11 provided close to it.

  The silencer 8 is obtained by attaching a silencer 12 such as rock wool or glass wool to an inner peripheral wall with a punching guide plate 13 having a number of holes.

  The auxiliary heat exchange unit 9 is provided meandering in the auxiliary heat exchange unit 9, a water inlet 14 is provided in the front part of the auxiliary heat exchange unit 9, and a water outlet 15 is provided in the rear part of the auxiliary heat exchange unit 9. The secondary heat exchange pipe 16 provided with the water and the dew condensation water which is stored in the bottom heat exchanger pipe 16 and falls from the secondary heat exchange pipe 16 is supplied to the neutralizer 17 in which the neutralizing agent is incorporated. A heat exchange case 19 to which a drain pipe 18 is connected, and the muffler 8 and the heat exchanger case 19 are inserted into the muffler 8 and the front end of the communication duct 20 is cut obliquely upward. Since the silencer 8 and the auxiliary heat exchanging portion 9 are arranged in parallel in the lateral direction above the can body portion 1, the auxiliary heat exchanging portion 9 is provided in the hot water storage type hot water supply apparatus. Even if it is provided, it is possible to reduce the size, particularly the height of the hot water supply device, and the combustion gas is silenced after the can body 1 is distributed. Since the heat exchange latent heat recovery is performed in the auxiliary heat exchange unit 9 via the temperature and combustion noise of the combustion gas flowing into the auxiliary heat exchange unit 9 also it becomes possible to be kept low.

  A communication passage 21 communicates from the outlet 10 at the upper part of the auxiliary heat exchanging part 9 to the exhaust pipe 11, and covers the upper side of the auxiliary heat exchanging part 9 and the muffler 8 with a flat box-like channel. Thus, the communication passage 21 is provided so as to be inclined downward from the exhaust tube 11 toward the outlet 10, and rainwater blown into the exhaust tube 11 and condensed water generated in the communication passage 21 are supplied to the auxiliary heat exchange unit 9. The water is surely collected in the neutralizer 17, and further, between the auxiliary heat exchanging part 9 and the exhaust pipe 11, covers the upper part of the auxiliary heat exchanging part 9 and the sound deadening part 8, and also the auxiliary heat exchange. Since the communication passage 21 inclined downward toward the outlet 10 of the section 9 is provided, the exhaust temperature is further lowered and the combustion noise is further suppressed, so that good exhaust and noise can be prevented. is there.

Next, the operation of this latent heat recovery type 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 sensible heat in the can body 1 flows into the silencer 8 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 velocity, and has a short wavelength even at the same frequency. Therefore, by arranging the silencer 8 upstream of the auxiliary heat exchanger 9, even the silencer 8 having a small volume can be used. It can effectively mute low frequencies.
In addition, by disposing the silencer 8 on the upstream side of the auxiliary heat exchange unit 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. is there.

The combustion gas that has passed through the silencer 8 flows into the heat exchange case 19 of the auxiliary heat exchanger 9 through the communication duct 20.
The combustion gas flowing into the heat exchange case 19 exchanges heat with the tap water flowing through the secondary heat exchange pipe 16 within the heat exchange case 19 to heat the tap water flowing into the can body portion 1, 21 is exhausted from the exhaust cylinder 11 to the outside.

  Here, the combustion gas after heat exchange in the secondary heat exchange pipe 16 becomes a low temperature, and dew condensation water is generated in the communication passage 21 or rainwater enters from the exhaust pipe 11, but the communication passage 21 is in heat exchange. Since it is inclined downward toward the outlet 10 of the case 19, the generated condensed water and rainwater can be smoothly collected in the neutralizer 17 via the heat exchange case 19.

  Further, if the silencer 8 is disposed in the exhaust path after the heat exchange by the auxiliary heat exchange unit 9, the silencer 12 of the silencer 8 may be corroded by strongly acidic condensed water. By disposing the silencer 8 in the upstream exhaust path, corrosion of the silencer 12 due to condensed water can be prevented.

  As described above, the silencer 8 and the auxiliary heat exchanger 9 are integrally provided in the upper part of the can body 1 in the lateral direction, so that the size, particularly the height of the hot water supply device can be reduced, and the exhaust gas can be exhausted. Since the silencer 8 is disposed upstream of the road and the auxiliary heat exchange unit 9 is disposed downstream, the silencer 8 can mute the combustion gas with high temperature and high speed at the upstream and short wavelength even at the same frequency. In addition, the space between the auxiliary heat exchanging portion 9 and the exhaust pipe 11 covers the upper side of the auxiliary heat exchanging portion 9 and the muffler portion 8, and further toward the outlet 10 of the auxiliary heat exchanging portion 9. Since the downwardly inclined communication passage 21 is provided, the exhaust temperature is further lowered, the combustion noise is further suppressed, and good exhaust and noise are prevented, and the sound is further silenced at a high temperature. Most of the latent heat and sensible heat are absorbed from the combustion gas of It is above, and those that can be neutralized with a neutralizer 17 without corroding the silencing material 12 of the muffling unit 8 in dew condensation water generated in the secondary heat exchanger 9.

DESCRIPTION OF SYMBOLS 1 Can body part 2 Burner 3 Combustion chamber 5 Heat exchange pipe 8 Silencer part 9 Sub heat exchange part 10 Outlet 11 Exhaust pipe 21 Communication path

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 exchange portion are disposed above the can body portion. In the present invention, the silencer and the auxiliary heat exchange part are arranged in parallel in the lateral direction, and the combustion gas passes from the can body part through the silencer part, through the auxiliary heat exchange part, and from the exhaust pipe above the silencer part. Between the outlet at the upper part of the auxiliary heat exchanging part and the exhaust pipe, the upper part of the auxiliary heat exchanging part and the sound deadening part are communicated with each other through a communication path that is covered with a flat box-shaped channel. The latent heat recovery type hot water supply apparatus is characterized in that the communication path is provided so as to be inclined downward from the exhaust tube side toward the outlet.

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