JP6621053B2 - Water heater - Google Patents

Description

  The present invention relates to a hot water supply apparatus, and more particularly to an improved structure for attaching temperature detecting means for detecting the temperature of a can of a heat exchanger to the can.

  Conventionally, various hot water supply apparatuses according to heat sources such as a gas hot water supply apparatus, an electric hot water supply apparatus, and an oil hot water supply apparatus have been widely used in general households. In particular, a gas hot water supply device exchanges heat between a blower fan that takes in combustion air from the outside, a burner unit that mixes and burns combustion air and fuel gas, and high-temperature combustion gas and water flowing through a heat transfer tube. A heat exchanger for heating the water, an exhaust pipe for discharging the exhaust gas after the heat exchange to the outside.

  As the heat exchanger, generally, a fin-and-tube heat exchanger composed of a copper heat transfer tube and a plurality of copper fins fixed to the heat transfer tube so as to transfer heat is applied. There is also provided a temperature detecting means for detecting the temperature (see Patent Document 1).

  By the way, when using tap water with high hardness as the tap water to be supplied to the heat exchanger, calcium and magnesium contained in the tap water and carbonate ions and sulfate ions are combined to form a scale. When the scale is formed and accumulated in the heat transfer tube of the heat exchanger, clogging of the scale occurs, and the heat exchange efficiency in the heat exchanger decreases. Moreover, when a hot-water supply apparatus is used for a long period of time, fins adhere to fins of the heat exchanger, resulting in clogging of the fins and a decrease in heat exchange efficiency in the heat exchanger.

  If you continue to use the hot water supply with the above scale clogging or fin clogging, the heat exchanger may be damaged, so if an abnormality such as clogging or fin clogging occurs, remove the scale or It is necessary to perform maintenance for removal. For this reason, conventionally, a technique has been employed in which the temperature of the heat exchanger is detected by temperature detection means, and an abnormality such as scale clogging is detected based on the detected temperature.

  In the unpublished Japanese Patent Application No. 2014-108508, the applicant of the present application has proposed a sensor fixing bracket for attaching temperature detection means for detecting the surface temperature of a can body of a fin-and-tube heat exchanger to the surface of the can body. . As shown in FIG. 10, the sensor fixture 100 includes a holding plate portion 101, a fixing portion 102, a pressing portion 103, a signal line holding portion 104, and a pair of attachment pieces extending downward from the holding plate portion 101. 105 and the engagement piece 106, and is made of a thin stainless steel plate.

  The heat exchanger 108 is disposed on the upper side of the burner can body 107. The sensor fixing bracket 100 is disposed in the vicinity of the front surface of the can body 109 of the heat exchanger 108, and the pair of attachment pieces 105 and the engagement pieces 106 are engaged with the engagement portions 111 of the flange 110 of the can body 109. It is fixed by. The sensor body 121 of the temperature detection sensor 120 is disposed between the outer surface of the can body 109 and the pressing portion 103, and is pressed by the pressing portion 103 so as to contact the outer surface of the can body 109. The positioning part 122 of the temperature detection sensor 120 is fixed to the protruding piece 112 a of the fixing part 112, and the signal line 123 of the temperature detection sensor 120 is held by the signal line holding part 104.

Japanese Patent Laid-Open No. 2015-114004

  When attaching the temperature detection sensor to the can body in the hot water supply production line, manually attach the sensor fixing bracket to the can body, and attach the sensor body between the outer surface of the can body and the pressing portion. . At this time, the pressing force of the pressing portion may not be constant in a plurality of hot water supply apparatuses of the same model, and variations may occur.

  When the contact state where the sensor body of the temperature detection sensor comes into contact with the outer surface of the can body changes, the detection temperature changes.Therefore, an error occurs in the detection temperature of the temperature detection sensor due to the variation in the pressing force of the pressing portion, It is difficult to stabilize the temperature detection performance of the temperature detection sensor.

  An object of the present invention is to provide a hot water supply device capable of ensuring the stability of the temperature detection performance of the temperature detection means.

  The hot water supply apparatus according to claim 1 is a heat exchanger for heating hot water with combustion gas generated in the combustion section, a temperature detection means for detecting the surface temperature of the heat exchanger, and the temperature detection means for the heat exchanger. A hot water supply apparatus comprising a fixing fitting fixed to the vicinity of the surface, wherein the heat exchanger includes a heat transfer pipe for circulating hot water, a plurality of fins brazed to the heat transfer pipe, the heat transfer pipe, In the hot water supply apparatus comprising a can body containing a plurality of fins and having a can body in which both end portions of the plurality of fins are brazed on the inner surface thereof, the fixing metal has the temperature detecting means fixed to the outer surface. A sensor fixing part and a metal fitting fixing part fixed to the outer surface of the can body, and a predetermined gap is formed between the sensor fixing part and the outer surface of the can body, The metal fitting fixing part includes the can body and one or more fins. It is characterized in that it is brazed to the outer surface portion of the can body corresponding to the outside of the brazing portion.

  According to a second aspect of the present invention, there is provided a hot water supply apparatus according to the first aspect of the invention, wherein the combustion section has a plurality of combustion regions that perform a combustion operation by switching according to the required capacity of the hot water supply, It is a position corresponding to the most downstream heat transfer pipe in the hot water flow direction among the heat transfer pipes directly facing from above, and is provided at a position corresponding to a combustion region frequently used in the combustion operation. It is a feature.

According to the invention of claim 1, the fixing bracket for fixing the temperature detection means has a sensor fixing portion and a bracket fixing portion, and the temperature detection means is fixed to the outer surface of the sensor fixing portion, The metal fitting fixing part is fixed to the outer surface of the can body.
Since the metal fitting fixing part is brazed to the outer surface portion of the can body corresponding to the outside of the brazing part to which one or more fins are brazed to the can body, one or more fins and Heat is transferred to the bracket fixing portion via the can, and the bracket fixing portion is reliably heated to a temperature reflecting the temperature of the heat transfer tube (a temperature substantially equal to the temperature of the heat transfer tube). Since heat is transferred from the metal fixture to the sensor fixture, the sensor fixture is also reliably heated to a temperature that reflects the temperature of the heat transfer tube.

A predetermined gap is formed between the sensor fixing portion and the outer surface of the can body, and the temperature detection means is fixed to the outer surface of the sensor fixing portion. The temperature of the sensor fixing part that reflects the temperature of the heat transfer tube is detected in a non-contact state.
The heat transfer path that transfers heat from the heat transfer tube to the sensor fixing part via one or more fins, cans, and metal fitting fixing part is constant and does not fluctuate in a plurality of hot water supply devices of the same model. The performance can be stabilized.

  In addition, by brazing only the bracket fixing portion to the can body without brazing the sensor fixing portion of the fixing bracket to the can body, the portion to be brazed to both the inner surface and the outer surface of the can body is minimized. Since it formed, the thermal distortion of a can can be suppressed and the fall of durability of a can can be prevented.

  According to invention of Claim 2, the said fixing metal fitting is a position corresponding to the most downstream heat transfer pipe in the hot water flow direction among the heat transfer pipes directly facing the combustion section from above, and is used in the combustion operation. It is provided at a position corresponding to a high-frequency combustion region. In this way, by fixing the fixing bracket at a position corresponding to the heat transfer tube with the high use frequency where the heat load becomes the highest in the combustion operation on the outer surface of the can body, the use frequency with the highest heat load is obtained. A temperature that reflects the high temperature of the heat transfer tube can be detected.

  The heat transfer tube with the highest heat load is likely to be clogged with scale, and fins are likely to clog in the vicinity, so the scale and soot accumulation state is estimated using the temperature detected by the above temperature detector. It becomes possible to do.

It is a schematic block diagram of the hot water supply apparatus which concerns on the Example of this invention. It is a front view of a heat exchanger for sensible heat recovery and a heat exchanger for latent heat recovery. It is a cross-sectional top view which shows the lower side heat exchanger tube, can body, and fin of the heat exchanger for sensible heat collection | recovery. It is a cross-sectional top view which shows the upper side heat exchanger tube, can body, and fin of the heat exchanger for sensible heat collection | recovery. It is a perspective view of the fixing metal attached to the outer surface of the can of the heat exchanger for sensible heat recovery, and the temperature detection sensor attached to this fixing metal. It is a principal part perspective view which shows the state which attached the fixing metal fitting, the protective cover, and the temperature detection sensor to the can. It is a principal part perspective view which shows the state which attached the fixing metal fitting and the temperature detection sensor to the can. It is a perspective view of a protective cover. It is a perspective view of a fixture. FIG. 6 is a diagram corresponding to FIG. 5 according to the undisclosed prior art.

  Hereinafter, modes for carrying out the present invention will be described based on examples.

Initially, the whole structure of the hot water supply apparatus 1 is demonstrated.
The hot water supply device 1 is applied as a heat source device such as a hot water supply device or a heating device, and as shown in FIG. 1, the heat generated by burning fuel gas is used to heat water or hot water. It constitutes a gas water heater.

  The hot water supply device 1 includes a blower fan 2 for supplying combustion air, a burner unit 3 for burning fuel gas, a heat exchange unit 4 for exchanging heat between the combustion gas and water by the burner unit 3, and this heat. A control unit 7 that receives signals from various exhaust pipes such as the exhaust port 5 for discharging the combustion gas after heat exchange by the exchanging unit 4, the water inlet pipe 6 a and the hot water outlet pipe 6 b, various sensors, and the like, and drives and controls various devices. I have.

Next, the burner unit 3 will be described.
As shown in FIGS. 1 and 2, the burner unit 3 includes a burner unit 11 that mixes and burns fuel gas supplied from a fuel supply pipe (not shown) and combustion air supplied from the blower fan 2, A burner can body 12 containing the burner unit 11 and a combustion space 13 above the burner unit 11 in the burner can body 12 are provided. The burner can body 12 is formed in a rectangular parallelepiped shape having an upper opening. A blower fan 2 is provided at the lower end of the burner can body 12.

  As shown in FIGS. 1 and 2, the burner unit 11 includes a plurality of combustion pipes 11a arranged in parallel so as to extend in the front-rear direction, for example, from six combustion stages (combustion regions) # 1 to # 6. The combustion stage is configured by switching the combustion stages # 1 to # 6 in accordance with the required capacity of hot water supply. The number of combustion tubes 11a that burn in the combustion stages # 1 to # 6 is, for example, 2, 3, 5, 7, 12, and 17. The plurality of combustion pipes 11a are connected to fuel supply pipes, respectively. The combustion operation in the combustion stages # 1 to # 6 is controlled by the control unit 7, respectively. Normally, the combustion stage with the highest use frequency is combustion stage # 2.

  As shown in FIG. 2, an igniter 15 and a frame rod 16 are provided in the combustion space 13 above the portion corresponding to the combustion stage # 1 of the burner unit 11, respectively. The igniter 15 and the frame rod 16 are attached to the front wall of the burner can body 12.

  The igniter 15 ignites the fuel-air mixture supplied from the burner unit 11 by generating an ignition spark with an ignition target provided in the burner unit 11 so as to protrude into the combustion space 13. And it is attached so that it may extend toward diagonally downward.

  The flame rod 16 detects the presence or absence of a flame by applying a voltage to the flame during the combustion operation of the burner unit 11 and detecting a current flowing from the flame rod 16 to the flame.

Next, the heat exchange unit 4 will be described.
As shown in FIGS. 1 and 2, the heat exchanging unit 4 mainly includes a sensible heat recovery heat exchanger 17 that recovers sensible heat of the combustion gas, and a combustion gas ( A latent heat recovery heat exchanger 19 that mainly recovers latent heat from the exhaust), a lower can 18 containing the heat transfer tubes 25 and a plurality of fins 26 of the heat exchanger 17, and a latent heat recovery heat exchanger 19 are accommodated. The upper can body 20 and the like are provided.

  As shown in FIGS. 3 to 5, the lower can 18 is configured in a rectangular tube shape having a rectangular shape in plan view, and the flange 21 at the lower end of the can 18 and the flange 22 at the upper end of the burner can 12 are: Joined by caulking or screw fastening.

  As shown in FIGS. 1 and 2, the upper can body 20 is formed in a rectangular parallelepiped shape, and toward the inside of the tray 6 d and the upper can body 20 for collecting drain (condensate) generated by the recovery of latent heat at the bottom thereof. An exhaust port 5 that has an open exhaust introduction port 24 and exhausts the exhaust gas after heat exchange to the outside of the hot water supply device 1 is provided at the lower left side of the upper can body 20 corresponding to the front side of the hot water supply device 1. .

  The lower end portion of the upper can body 20 and the upper end portion of the lower can body 18 are joined by caulking or screw fastening. As shown in FIG. 2, a temperature fuse 23 capable of detecting an abnormally high temperature is provided around the lower portion of the can body 18 in order to detect leakage of exhaust gas from the can body 18. The thermal fuse 23 is attached to the flange 21 by a plurality of fuse fixing brackets 23a.

Next, the sensible heat recovery heat exchanger 17 will be described.
As shown in FIGS. 2 to 4, the heat exchanger 17 is a fin-and-tube heat exchanger including a heat transfer tube 25 and a plurality of fins 26 and the like fixed to the heat transfer tube 25 so as to transfer heat.
The heat transfer tube 25 includes a lower heat transfer tube 25 </ b> A disposed horizontally in the left-right direction below the heat exchanger 17, and an upper heat transfer tube 25 </ b> B disposed horizontally above the heat exchanger 17 in the left-right direction. The lower heat transfer tube 25 </ b> A is obtained by connecting a plurality of straight tubes 27 a to 27 d in series using a U-shaped connection tube 28. The upper heat transfer tube 25 </ b> B is obtained by connecting a plurality of straight tubes 27 e to 27 h in series using a U-shaped connection tube 28.

  The plurality of fins 26 of the heat exchanger 17 are each composed of a vertical thin plate having a vertical width substantially the same as the vertical width of the can 18, and are arranged in parallel in the left-right direction at small intervals. The flanges 26a at both front and rear ends of the fin 26 are fixed to the inner surfaces of the front wall 18a and the rear wall 18b of the can 18 by brazing. The straight pipes 27 a to 27 h are arranged so as to penetrate through holes formed in the plurality of fins 26, and the straight pipes 27 a to 27 h are brazed to the peripheral portions of the through holes of the plurality of fins 26. The heat transfer tubes 25 and the fins 26 are made of copper, but are not particularly limited to this material, and may be made of stainless steel.

  Fuel gas is supplied to the burner unit 11 from the fuel supply pipe and combustion air is supplied from the blower fan 2, and a fuel-air mixture in which fuel gas and air are mixed is burned in the combustion space 13. The combustion gas generated at this time is introduced into the inside of the can 18 above the combustion space 13, heats the water in the heat exchanger 17 and cools down, is exhausted from the can 18, and is exhausted from the exhaust introduction port 24. 20 inside.

  After the water is warmed by the latent heat recovery heat exchanger 19, it is supplied to the heat exchanger 17 as indicated by the arrow A in FIG. 3 and flows through the lower heat transfer tube 25A, and then the inner portion of the upper heat transfer tube 25B. While passing through the heat exchanger 17 as described above, the clean water is heated by the sensible heat of the combustion gas to become warm water, and the hot water is supplied from the outlet pipe 6b as shown by the arrow B in FIG. Hot water is discharged outside.

  Next, a temperature detection sensor 30 for detecting the temperature of the surface of the can body 18 (this corresponds to temperature detection means) and the temperature detection sensor 30 are attached to the vicinity of the surface of the front wall 18 a of the can body 18. The fixing bracket 40 will be described.

  As shown in FIGS. 2 and 3, the fixing bracket 40 to which the temperature detection sensor 30 is attached directly faces the combustion space 13 of the combustion unit 3 in the vicinity of the surface of the front wall 18 a of the can 18 from above. The position corresponding to the most downstream heat transfer tube 25 (straight tube 27d) in the hot water flow direction in the lower heat transfer tube 25A, and in the combustion region (combustion stage # 2) frequently used in the combustion operation It is provided at the corresponding position. This is to detect a temperature that reflects the temperature of the heat transfer tube 25 at a portion where the heat load is highest (a portion where scale and soot are most likely to accumulate).

  As shown in FIGS. 5 to 9, the fixing bracket 40 includes a sensor fixing portion 41 parallel to the front wall 18 a of the can 18, a pair of left and right legs 42 a and 42 b, and a left and right 1 parallel to the front wall 18 a. It has a pair of bracket fixing portions 43a and 43b, a pair of left and right projecting pieces 44a and 44b, and a pair of upper and lower rotating flanges 45a and 45b, which are integrally formed using a copper plate material. .

  The sensor fixing portion 41 is for fixing the temperature detection sensor 30 to the outer surface of the sensor fixing portion 41, and is formed in a rectangular flat plate shape elongated in the left-right direction. A screw hole 41 a is formed in a portion near the right end of the sensor fixing portion 41. The pair of left and right leg portions 42 a and 42 b are for forming a predetermined gap S between the sensor fixing portion 41 and the front wall 18 a of the can 18, and are rearward from both left and right end portions of the sensor fixing portion 41. Each has a predetermined length.

  The pair of left and right metal fitting fixing portions 43a and 43b are for fixing the fixing metal fitting 40 to the front wall 18a of the can body 18 by brazing. The pair of left and right leg portions 42a and 42b are connected to the sensor fixing portion 41. Each extends to the opposite side. The pair of left and right projecting pieces 44a and 44b are for setting a brazing material on the upper surface thereof, and extend obliquely upward and forward from the upper ends of the pair of left and right metal fitting fixing portions 43a and 43b, respectively. .

  A pair of upper and lower rotation-preventing flanges 45a and 45b restrict the temperature detection sensor 30 from rotating when the temperature detection sensor 30 is fixed with the screw 33, and a protective cover 50, which will be described later, is attached to the fixing bracket 40. It is for mounting | wearing, and protrudes horizontally from the upper end and lower end of the sensor fixing | fixed part 41 to the front.

  The temperature sensor 30 is formed, for example, by sealing a thermistor with a ceramic sealing material 30a. A positioning portion 31 made of a ring-shaped metal plate is formed at one end, and a signal line harness 32 is connected from the other end. It extends to the left.

  When the fixing bracket 40 is fixed to the front wall 18a of the can body 18 by brazing, the fixing bracket 40 is fixed to a predetermined mounting position of the front wall 18a by a jig not shown in the drawing, and a pair of bracket fixing portions 43a and 43b. Is held in contact with the front wall 18 a of the can 18, brazing material is set on the upper surface side of the pair of projecting pieces 44 a and 44 b, and the heat transfer tube 25 of the heat exchanger 17 and the plurality of fins 26 are joined together. And the joints between the flanges 26a at the front and rear ends of the plurality of fins 26 and the inner surface of the can 18 are brazed by brazing in the furnace, and at the same time, the pair of metal fitting fixing portions 43a and 43b are placed in the furnace by the brazing material. It is fixed to the front wall 18a of the can body 18 by brazing.

After the brazing in the furnace is completed, the temperature detection sensor 30 is disposed on the outer surface of the sensor fixing portion 41 in a surface contact manner, and the positioning portion 31 is fixed to the sensor fixing portion 41 with a screw 33.
Thereafter, the protective cover 50 that covers the sensor fixing portion 41 and the temperature detection sensor 30 is attached. The protective cover 50 is for protecting the ceramic sealing material 30 a of the temperature detection sensor 30.

  The protective cover 50 includes a flat plate portion 51 that covers the front surface of the temperature detection sensor 30 from the front, a pair of engagement pieces 52 and 53 that extend backward from both upper and lower ends of the flat plate portion 51, and a right end of the flat plate portion 51 from the rear. It has a restricting portion 54 that extends, and is integrally formed of an elastic stainless steel thin plate material.

  The upper engagement piece 52 has an engagement claw 52a folded back and forward at the rear end thereof, and this engagement piece 52 extends rearward along the upper surface of the upper flange 45a, and the engagement claw 52a. Is fixed by engaging with the rear surface of the sensor fixing portion 41. The lower engagement piece 53 has an engagement claw 53a folded back forward and upward at its rear end, and the lower engagement piece 53 extends rearward along the lower surface of the lower flange 45b. The engaging claw 53a is engaged with the rear surface of the sensor fixing portion 41 and fixed.

  In a state where the fixing bracket 40 is fixed to the outer surface of the front wall 18a of the can body 18 and the temperature detection sensor 30 is fixed to the outer surface of the sensor fixing portion 41, the rear surface of the sensor fixing portion 41 and the front wall 18a of the can body 18 are fixed. A predetermined gap S (for example, about 5 to 10 mm) is formed between the outer surface.

Next, the operation and effect of the fixture 40 and the temperature detection sensor 30 of the hot water supply device 1 described above will be described.
The fixing bracket 40 includes a sensor fixing portion 41 having a predetermined gap S between the outer surface of the can 18 and metal fixing portions 43a and 43b integrally connected to the sensor fixing portion 41. The detection sensor 30 is fixed to the outer surface of the sensor fixing portion 41, and the metal fixture fixing portions 43 a and 43 b are brazed to the outer surface of the can body 18.

  Since the metal fitting fixing portions 43a and 43b are brazed to the outer surface portion of the can body 18 corresponding to the outside of the brazing portion where one or a plurality of fins 26 are brazed to the can body 18, the heat transfer tube 25 Heat is transferred to the metal fixtures 43a and 43b via the one or more fins 26 and the can 18 and the metal fixtures 43a and 43b reflect the temperature of the heat transfer tube 25 (a temperature substantially equal to the temperature of the heat transfer tube 25). It is surely heated. Since heat is transferred from the metal fixtures 43 a and 43 b to the sensor fixture 41, the sensor fixture 41 is also reliably heated to a temperature that reflects the temperature of the heat transfer tube 25.

A predetermined gap S is formed between the sensor fixing portion 41 and the outer surface of the can 18, and the temperature detection sensor 30 is fixed to the outer surface of the sensor fixing portion 41. The temperature of the sensor fixing portion 41 that reflects the temperature of the heat transfer tube 25 is detected in a non-contact state with the outer surface of 18.
The heat transfer path for transferring heat from the heat transfer tube 25 to the sensor fixing portion 41 via the one or plural fins 26, the can 18 and the metal fitting fixing portions 43a and 43b is constant and does not vary in a plurality of hot water supply devices of the same model. The temperature detection performance by the temperature detection sensor 30 can be stabilized.

  The fixing bracket 40 is the most downstream side transfer in the hot water flow direction of the lower heat transfer tube 25A of the lower heat transfer tube 25A that directly faces the combustion space 13 of the combustion section 3 from above on the outer surface of the front wall 18a of the can 18. It is provided at a position corresponding to the straight pipe 27d which is the heat pipe 25 and corresponding to the combustion stage # 2 which is a combustion region frequently used in the combustion operation. Thus, the temperature reflecting the temperature of the heat transfer tube 25 at which the heat load is maximized is fixed by fixing the fixing bracket 40 at a position corresponding to the heat transfer tube 25 with high use frequency at which the heat load is maximized in the combustion operation. Can be detected.

  The heat transfer tube 25 having the highest thermal load is likely to be clogged with scales and easily clogged with fins in the vicinity thereof. Therefore, the scale and soot accumulation state using the temperature detected by the temperature detection sensor 30 described above. Can be estimated with high accuracy.

  Since the fixing bracket 40 has the bracket fixing portions 43a and 43b on the left and right sides of the sensor fixing portion 41, the fixing bracket 40 can be attached to the can 18 in a stable state. Moreover, since heat is transferred from the metal fixtures 43a and 43b on both sides to the sensor fixture 41, the heat transfer to the sensor fixture 41 is excellent.

  Moreover, both the inner surface and the outer surface of the can body 18 can be obtained by brazing only the bracket fixing portions 43a and 43b to the can body 18 without brazing the sensor fixing portion 41 of the fixing bracket 40 to the can body 18. Since the portion to be brazed is made as small as possible, the thermal distortion of the can body 18 can be suppressed and the durability of the can body 18 can be prevented from being lowered.

Next, an example in which the above embodiment is partially changed will be described.
1) The protective cover 50 is not essential and may be omitted.
2) The fixing bracket 40 shows an example, and those skilled in the art can implement the present invention by adding various modifications to the above-described embodiment, and the present invention includes such modifications.

DESCRIPTION OF SYMBOLS 1 Hot-water supply apparatus 3 Combustion part 17 Sensible heat recovery heat exchanger 18 Can body 25 Heat transfer tube 25A Lower heat transfer tube 25B Upper heat transfer tube 26 Fin 30 Temperature detection sensor (temperature detection means)
40 fixing bracket 41 sensor fixing portion 43a, 43b bracket fixing portion S gap

Claims (2)

A heat exchanger for heating hot water with combustion gas generated in the combustion section, a temperature detection means for detecting the surface temperature of the heat exchanger, and a fixing bracket for fixing the temperature detection means to the vicinity of the surface of the heat exchanger A water heater with
The heat exchanger includes a heat transfer tube through which hot water flows, a plurality of fins brazed to the heat transfer tube, and a can body containing the heat transfer tube and the plurality of fins, and the plurality of fins on the inner surface thereof In a hot water supply apparatus comprising a can body brazed at both ends of
The fixing bracket has a sensor fixing portion where the temperature detecting means is fixed to the outer surface, and a bracket fixing portion fixed to the outer surface of the can body,
A predetermined gap is formed between the sensor fixing portion and the outer surface of the can body, and the metal fitting fixing portion corresponds to the outside of the brazing portion of the can body and one or a plurality of fins. A hot water supply apparatus, characterized by being brazed to an outer surface portion of a body.   The combustion section has a plurality of combustion regions that perform a combustion operation by switching according to the required capacity of hot water supply, and the fixing bracket is the most in the hot water flow direction of the heat transfer pipe facing the combustion section from above. The hot water supply apparatus according to claim 1, wherein the hot water supply apparatus is provided at a position corresponding to a downstream heat transfer tube and corresponding to a combustion region frequently used in the combustion operation.

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