JP5801757B2 - Secondary heat exchanger for latent heat recovery water heater - Google Patents

Description

  The present invention relates to a secondary heat exchange device for a latent heat recovery type hot water heater that reduces exhaust resistance (combustion chamber pressure) while ensuring thermal efficiency, and further prevents splashing of the drain to the outside of the exhaust port.

  Conventionally, in this type of latent heat recovery type hot water supply apparatus, a pipe-like secondary heat exchanger is provided in communication with a combustion chamber equipped with a primary heat exchanger, and the partition plate is also inclined, for example. The collection was also good. (For example, refer to Patent Document 1.)

JP 2010-281495 A

  By the way, in this conventional one, in order to improve the heat efficiency of the secondary heat exchanger, the heat exchange pipes are densely provided, the communication part between the combustion chamber and the secondary heat exchange part, or the secondary heat exchange part. By narrowing the exhaust part and extending the heat exchange time with the combustion gas, the exhaust resistance increases, the combustion chamber pressure also rises, and good combustion cannot be obtained unless the combustion air pressure is increased. In order to prevent this, if the exhaust part communicating with the exhaust port is greatly opened, the strongly acidic drain generated in the heat exchange pipe is now sent from the exhaust port together with the blowing of combustion gas. It jumped and generated a new problem that corroded the exhaust port and the exhaust pipe.

  In order to solve the above-mentioned problems, the present invention is constructed in particular in claim 1 and a drain discharge port is formed near one side of the bottom of the box-shaped casing, and a combustion gas is formed at the bottom on the opposite side of the drain discharge port. An inflow port is formed, and an exhaust port for combustion gas is provided in the upper center of the casing, and a plurality of endothermic pipes are densely hung between the forward header and return header that are erected in the casing. In the storage of the handed secondary heat exchanger, the center in the height direction of the casing is partitioned including the heat absorption pipe, and provided with a partition plate formed with a communication port on the side opposite to the inlet. Further, there is an auxiliary partition plate that is divided above the partition plate and below the exhaust port into a combustion gas that goes directly from the communication port to the exhaust port and a combustion gas that passes through the exhaust port and then goes to the exhaust port. It is.

  According to a second aspect of the present invention, the entire casing is inclined and attached so that the drain outlet side is at the lowest position.

  According to a third aspect of the present invention, the endothermic pipe is eliminated from the inlet to the partition plate.

  According to the first aspect of the present invention, the substantially central portion of the casing including the heat absorption pipe is partitioned up and down by the partition plate, so that the combustion gas can be folded only once at the communication port, and the combustion gas is With this large flow, the heat exchange efficiency is improved and the heat exchange efficiency is improved, the flow resistance is low, and the exhaust resistance (combustion chamber pressure) can be reduced. Since the flow can be divided into a flow that goes directly to the exhaust port and a detour flow that once flows under the auxiliary partition plate and then goes to the exhaust port, it can prevent a large flow toward the exhaust port of the combustion gas, and the jump of the drain Is prevented, and corrosion of the exhaust port and the exhaust pipe is surely prevented.

  According to the second aspect of the present invention, since the entire casing is mounted so as to be inclined so that the drain outlet side is at the lowest position, the drain is reliably collected, and the structure is simple and the assembly can be easily performed. Is.

  According to the third aspect of the present invention, since the heat absorption pipe is eliminated from the inlet to the partition plate, the heat absorption pipe does not get in the way and the flow of the combustion gas into the casing is performed smoothly. The dripping of the drain into the combustion chamber can be surely prevented, so that the combustion chamber is prevented from being corroded or damaged, making it extremely safe and secure.

The schematic block diagram which shows the hot water supply apparatus which has the secondary heat exchange apparatus of one Embodiment of this invention. The cross-sectional schematic of the secondary heat exchange apparatus of the same embodiment. The disassembled perspective view of the secondary heat exchange apparatus of the same embodiment.

Next, a hot water supply apparatus according to an embodiment of the present invention will be described with reference to FIGS.
1 is a latent heat recovery type vaporization type oil hot water supply apparatus of the present embodiment, 2 is a vaporizer that vaporizes fuel oil such as petroleum, 3 is a vaporizer heater that is provided in the vaporizer 2 and heats the fuel oil to a vaporizable temperature, 4 Is a vaporization temperature sensor that detects the temperature of the vaporizer 2, 5 is a mixing chamber that communicates with the vaporizer 2 and premixes the vaporized gas and primary air vaporized in the vaporizer 2, and 6 is provided at the bottom of the mixing chamber 5. A mixing chamber heater for heating the mixing chamber 5, 7 is a mixing chamber temperature sensor for detecting the temperature of the mixing chamber 5, and 8 is in communication with the mixing chamber 5 and combusts the premixed gas premixed in the mixing chamber 5. A burner unit 9 as a combustion unit is a plurality of heat-absorbing fins protruding on the burner unit 8 on the back of the vaporizer 2. The combustion heat is fed back to the vaporizer 2, and the energization amount of the vaporizer heater 3 is minimized. It is to suppress.

  10 is a nozzle for spraying fuel oil to the vaporizer 2, 11 is an electromagnetic pump for pumping fuel oil to the nozzle 10 via an oil feed pipe 12, 13 is a combustion fan, and an inlet and burner of the vaporizer 2 via a blower passage 14. Combustion air that is communicated with the air chamber 16 between the portion 8 and the cover frame 15 and sucked from the suction port 17 is supplied to the vaporizer 2 as primary air for premixing, and the air chamber 16 is supplied with the vaporizer 2. It is supplied as secondary air that passes through the side and is combusted in the burner section 8 from below the mixing chamber 5.

  Reference numeral 18 denotes a primary heat exchanger accommodated in the combustion chamber 19. The primary heat exchanger 18 collects sensible heat from the combustion gas generated by the combustion of the burner unit 8 and heats water flowing through the primary heat receiving pipe 20. 21 is a secondary heat exchanger that recovers latent heat from the combustion gas after passing through the primary heat exchanger 18 and heats the water flowing through the thin heat absorption pipe 22. 8, a primary heat exchanger 18 is disposed above the primary heat exchanger 18, and a secondary heat exchanger 21 is disposed above the primary heat exchanger 18. The primary heat exchanger 18 and the secondary heat exchanger 21 are arranged in this order. The passing combustion gas is exhausted out of the hot water supply apparatus 1 through the exhaust port 23.

  The secondary heat exchanger 21 is provided in a box-shaped casing 24 provided on the combustion chamber 19 and constitutes a secondary heat exchange device 25. A drain discharge port 27 is formed, a combustion gas inlet 28 is formed at the bottom 26 opposite to the drain discharge port 27, and the combustion gas exhaust port 23 is formed at the center of the upper portion 29 of the casing 24. Further, the secondary heat exchanger 21 in the casing 24 includes a plurality of meanders composed of nine narrow tubes between a forward header 30 and a return header 31 erected before and after the left end of the bottom portion 26. The endothermic pipes 22 that are partly formed are densely spanned, and the casing 24 is located between the fourth and fifth ends from the bottom of the endothermic pipe 22 at approximately the center in the height direction of the casing 24. Up and down A partition plate 32 is provided, and a communication port 33 composed of a plurality of elongated holes is formed at the end of the partition plate 32 opposite to the inlet 28, and the casing 24 partitioned by the partition plate 32. Combustion is directed from the communication port 33 directly to the exhaust port 23 between the seventh and eighth pipes below the heat absorption pipe 22 and above the partition plate 32 and below the exhaust port 23. The auxiliary partition plate 34 larger than the exhaust port 23 that divides the gas and the combustion gas that detours below the exhaust port 23 and then travels toward the exhaust port 23 is provided. As a large flow from the top to the bottom, there is no obstruction, heat exchange efficiency is good, exhaust resistance is reduced, the internal pressure of the combustion chamber 19 is low, and good combustion can be easily obtained without blowing strong air. And communication Since the flow of the combustion gas that has exited 33 can be divided into two, a large flow of the combustion gas toward the exhaust port 23 can be prevented, the splash of the drain is prevented, and the corrosion of the exhaust port 23 and the exhaust pipe is also reliably prevented. Is.

  Reference numeral 35 denotes an attachment board for mounting the secondary heat exchange device 25 on the combustion chamber 19, and a packing 36 made of a fine sheet is provided between the casing 24 and a fixing bracket 37 between the combustion chamber 19. The mounting substrate 35 itself is formed so that the left side when viewed from the front is thin and gradually thicker toward the right side. By placing the casing 24 on the combustion chamber 19, the casing 24 has a drain outlet 27. It is attached so as to incline downward toward the left side.

  Furthermore, between the inflow port 28 and the partition plate 32 in the casing 24, the heat absorption pipe 22 is shortened and U-turned so that the heat absorption pipe 22 is not positioned so that the inflow of combustion gas is not hindered. Inflow and reliably prevents the drain from entering the combustion chamber 19 to prevent corrosion and breakage.

Reference numeral 38 denotes a drain pipe that guides the drain received and collected at the bottom 26 of the casing 24 to the neutralizer 39.
40 is a water supply pipe for circulating water supplied from a water supply source to the secondary heat exchanger 21, and 41 is a hot water tap (not shown) provided at a predetermined location for circulating hot water heated by the primary heat exchanger 18. ) Is a water supply bypass pipe branched from the water supply pipe 40, and includes a primary heat exchanger 18, a secondary heat exchanger 21, a water supply pipe 40, a hot water supply pipe 41, and a water supply bypass pipe 42. It constitutes a hot water supply circuit through which water flows.

  A mixing valve 43 is provided at a connecting portion between the hot water supply pipe 41 and the water supply bypass pipe 42, mixes hot water from the hot water supply pipe 41 and water from the water supply bypass pipe 42, and can change the mixing ratio. 44 is a water supply pipe A water supply temperature sensor for detecting a water supply temperature provided at 40, a flow sensor for detecting a flow rate provided at a water supply pipe 40, and a heat sensor provided at a hot water supply pipe 41 and heated by a primary heat exchanger 18 and a secondary heat exchanger 21. A heat exchange outlet temperature sensor 47 for detecting the temperature of the hot water provided is a hot water supply temperature sensor 47 provided in the hot water supply pipe 41 for detecting the temperature of the hot water mixed by the mixing valve 43.

  48 is a control means for controlling the driving of the actuators such as the vaporizer heater 3, the mixing chamber heater 6, the combustion fan 13 and the like by receiving signals from the sensors of the latent heat recovery type vaporized petroleum hot water supply apparatus 1 mainly using a microcomputer. It is.

  A remote controller 49 is connected to the control means 48 so as to be communicable, and remotely controls the latent heat recovery vaporization type petroleum hot water supply device 1. The remote control 49 is an operation for instructing on / off operation of the latent heat recovery type vaporization petroleum hot water supply device 1. An operation unit 51 including a switch 50 and a hot water supply temperature setting switch for setting the hot water supply temperature is provided.

Next, the operation of the latent heat recovery type vaporized petroleum hot water supply device 1 of this embodiment will be described.
When the operation switch 50 of the remote controller 49 is turned on, the control means 48 controls the vaporizer heater 3 based on the temperature detected by the vaporization temperature sensor 4 and mixes based on the temperature detected by the mixing chamber temperature sensor 7. The chamber heater 6 is controlled to preheat the vaporizer 2 and the mixing chamber 5, the temperature at which the vaporizer 2 can vaporize the fuel oil, for example, the temperature of the vaporizer 2 is maintained at 220 ° C. to 225 ° C. It will be in the standby state in which temperature is maintained at 125 to 130 degreeC. In this standby state, when a combustion request is generated, the burner unit 8 can be quickly ignited, and the power consumption during standby can be reduced by maintaining the necessary minimum temperature.

  In the standby state, when the control means 48 determines that the hot water tap is opened and the flow rate sensor 45 detects a flow rate equal to or higher than the minimum operating flow rate and a combustion request is generated, the carburetor heater 3 and the mixing chamber heater 6 is forcibly turned on to improve the ignitability, the electromagnetic pump 11 and the combustion fan 13 are driven, and the vaporized gas and the primary air vaporized in the vaporizer 2 are premixed in the mixing chamber 5 and premixed. Gas is ejected from the burner section 8 to start combustion.

  The combustion gas generated by the combustion of the burner section 8 flows through the primary heat exchanger 18, passes through the primary heat exchanger 18, then flows through the secondary heat exchanger 21, and passes through the secondary heat exchanger 21. After that, it is discharged from the exhaust port 23 to the outside of the latent heat recovery type vaporized petroleum hot water supply device 1. Further, the water supplied from the water supply source is led from the water supply pipe 40 to the heat absorption pipe 22, and sequentially flows from the heat absorption pipe 22 to the primary heat reception pipe 20 where it is heated by heat exchange with the combustion gas, and Hot water led from the primary heat receiving pipe 20 to the hot water supply pipe 41 and adjusted to the hot water supply set temperature by adjusting the opening of the mixing valve 43 is finally supplied from the hot water tap.

  At this time, in the secondary heat exchanging device 25, there is no heat absorption pipe 22 at the inlet 28 of the casing 24, the combustion gas from the combustion chamber 19 tends to flow in, and the drain adhering to the heat absorption pipe 22 drops into the combustion chamber 19. The inflowing combustion gas is guided by the partition plate 32 and flows toward the communication port 33 opposite to the inflow port 28 to heat the lower four heat absorption pipes 22, and By passing through the communication port 33 and changing the direction toward the exhaust port 23, the upper five heat absorption pipes 22 are heated and exhausted from the exhaust port 23. Since the path is divided into two flow passages in which the center in the height direction in the casing 24 is partitioned by the partition plate 32 and the flow direction is changed up and down, heat exchange can be efficiently performed without waste, and heat efficiency can be improved. As well as distribution It is those that can be reduced reducing the exhaust resistance (combustion chamber pressure), but which can be easily obtained good combustion.

  Further, the combustion gas flowing from the communication port 33 toward the exhaust port 23 is provided with an auxiliary partition plate 34 below the exhaust port 23, so that the combustion gas flowing directly toward the exhaust port 23 and the auxiliary gas below the exhaust port 23 are supported. Since it is divided into two flows that flow toward the exhaust port 23 after passing under the partition plate 34, it adheres to the heat absorption pipe 22 that is generated when a large amount of combustion gas is discharged from the exhaust port 23 vigorously. It is possible to reliably prevent the danger that the drained water jumps and corrodes the exhaust port 23 and the exhaust pipe, and can be used with confidence.

  Further, the inclination of the casing 24 toward the drain outlet 27 is formed by attaching the entire casing 24 by the attachment substrate 35 so that the drain is reliably collected, and the secondary heat exchange is performed. The device 25 itself can be manufactured as usual, and has a simple structure and can be easily assembled.

  Furthermore, between the inflow port 28 and the partition plate 32 in the casing 24, the heat absorption pipe 22 is shortened and U-turned so that the heat absorption pipe 22 is not positioned so that the inflow of combustion gas is not hindered. Inflow and reliably prevents the drain from entering the combustion chamber 19 to prevent corrosion and breakage.

21 Secondary heat exchanger 22 Endothermic pipe 23 Exhaust port 24 Casing 25 Secondary heat exchange device 26 Bottom 27 Drain discharge port 28 Inlet port 30 Forward header 31 Return header 32 Partition plate 33 Communication port 34 Auxiliary partition plate

Claims (3)

  A drain discharge port is formed near one side of the bottom of the box-shaped casing, a combustion gas inlet is formed at the bottom opposite to the drain discharge port, and a combustion gas exhaust port is provided at the upper center of the casing. Further, in the casing, a secondary heat exchanger in which a plurality of endothermic pipes are densely spanned between a standing forward header and a return header is accommodated. In addition to partitioning the center of the direction including the heat absorption pipe, a partition plate having a communication port is formed on the side opposite to the inflow port, and further above the partition plate and below the exhaust port, the communication port is directly connected to the exhaust port. A secondary heat exchange device for a latent heat recovery type hot water supply apparatus, comprising an auxiliary partition plate that divides into a combustion gas heading and a combustion gas passing through a lower portion of the exhaust port and then heading toward the exhaust port.   The secondary heat exchange device for a latent heat recovery type hot water heater according to claim 1, wherein the entire casing is attached so as to be inclined so that a drain discharge port side is at the lowest position.   The secondary heat exchange device for a latent heat recovery type hot water heater according to claim 1, wherein a heat absorption pipe is eliminated from the inlet to the partition plate.

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