JP4120854B2 - Heat exchanger for water heater - Google Patents

Description

[0001]
BACKGROUND OF THE INVENTION
The present invention relates to a heat exchanger for a hot water heater using gas, oil, and electricity as fuel. Specifically, the present invention relates to prevention of boiling of heat exchangers such as first-stop water heaters used for general household use and business use, bath pots with water heaters, hot water heaters with water heaters, and the like.
[0002]
[Prior art]
2. Description of the Related Art Conventionally, it is known that a turbulence device is provided in a water pipe of a heat exchanger for a hot water heater, that is, in a water passage section through which water flows to prevent boiling and increase noise due to boiling. As a turbulent flow device, for example, a heat exchanger using a twisted plate or a coil is known as shown in JP-A-3-122451. Moreover, what formed the cut-and-raised part of a turbulent flow plate in the shape of a semicircle like the heat exchanger of actual open flat 5-42955 is known.
[0003]
[Problems to be solved by the invention]
However, in each of the conventional heat exchangers for hot water heaters, resistance due to water flow occurs in the entire water pipe, and this water flow resistance cannot be reduced. That is, when a torsion plate or coil is simply inserted in the water pipe, the entire torsion plate becomes resistance to the water flow, and a substantially uniform water flow resistance is generated in the water pipe. In addition, when the turbulent plate is simply provided with a cut-and-raised portion, not only the resistance to water flow is further increased, but also the effect of partial boiling generated from the lower portion of the water pipe is small.
[0004]
In view of the above problems, an object of the present invention is to provide a heat exchanger for a hot water heater in which the resistance of water flowing through a water pipe is further reduced and partial boiling is reduced.
[0005]
[Means for Solving the Problems]
In order to solve the above-described problems, a heat exchanger for a water heater according to the present invention is inserted into a heat absorption fin for heat exchange, a water pipe inserted through the heat absorption fin, and inside the water pipe toward a water flow direction. In the case of providing an elongated plate, the plate is provided with a semicircular portion and a connecting portion for connecting the semicircular portion and the plate, and the arc portion of the semicircular portion is substantially the same shape as the inner circular portion of the water pipe In addition, the first feature is that a twisted portion is provided in the connecting portion, and the arc portion of the semicircular portion is formed along the inner surface of the water pipe.
According to the first feature, by making the arc portion of the semicircular portion of the elongated plate substantially the same shape as the inner surface shape of the water tube, and by making this arc portion along the inner surface of the water tube, at least the upper half of the cross section of the water tube is A flow path without water flow resistance is formed, and the flowing water flowing through this flow path is fast and smooth, and the partial boiling water generated at the lower part of the water pipe is mixed and disturbed with the above flowing water to flow out. To do.
[0006]
Further, the heat exchanger for a water heater of the present invention includes an endothermic fin for heat exchange, a water pipe inserted into the endothermic fin, and an elongated plate inside the water pipe and inserted toward the water passing direction. The plate is provided with a semicircular portion and a connecting portion for connecting the semicircular portion and the plate, the arc portion of the semicircular portion is substantially the same shape as the inner circular portion of the water pipe, and the semicircular portion A second feature is that both shoulder portions are cut out in a U-shape, and a twisted portion is provided in the connecting portion so that the arc portion of the semicircular portion extends along the inner surface of the water pipe.
According to the second feature, by cutting out both shoulders of the semicircular portion of the plate into a U shape, in addition to the above feature, the U portion becomes a water passage, and the water passage cross-sectional area increases. Thus, the resistance to water flow is further reduced, and mixing with the partially boiling water generated from the lower part of the water pipe becomes quick, and the boiling sound can be reduced.
Furthermore, the heat exchanger for a water heater of the present invention has a third feature that the semicircular portion of the plate is twisted by approximately 90 degrees with respect to the longitudinal direction of the plate.
According to the third feature, a turbulent flow is likely to occur when the semicircular portion hits the semicircular portion, mixing disturbance with boiling water is promoted, and the reduction of boiling noise is further improved.
[0007]
DETAILED DESCRIPTION OF THE INVENTION
Hereinafter, embodiments of the present invention will be described with reference to the drawings. FIG. 1 is an overall configuration diagram of a water heater showing an embodiment of the present invention. FIG. 2 is an overall view of a plate showing an embodiment of the present invention. FIG. 3 is a cross-sectional view showing the relationship between the water pipe and the plate showing the embodiment of the present invention. FIG. 4 is a cross-sectional view of the water tube as viewed from the side. FIG. 5 is an explanatory diagram showing the flow of combustion gas. FIG. 6 is a partially enlarged view of the plate.
[0008]
In FIG. 1, reference numeral 1 denotes a water heater, in which a water heater heat exchanger 2 in which a water pipe penetrates the fin, a gas burner 3 for heating hot water, a blower fan 4 for blowing combustion air, and various controls are performed. The main body controller 5 is provided. Reference numeral 6 denotes a remote controller having a display unit 7 for remotely operating the water heater 1 and displaying operation information such as a hot water temperature and time on a screen, and has a buzzer 8 for notification built therein.
[0009]
Reference numeral 9 denotes a water inlet pipe that leads to the water heater heat exchanger 2, and 10 denotes a hot water outlet pipe that leads from the water heater heat exchanger 2 to a bathroom caran described later. A water pipe 11 comprising a water inlet pipe 9 and a hot water outlet pipe 10 and connected to the heat exchanger 2 is provided with a water amount sensor 12 for detecting the amount of water passing through the water pipe from its upstream side and a water temperature sensor 13 for detecting the incoming water temperature. The hot water outlet pipe 10 is provided with a temperature sensor 14 made up of a thermistor or the like as a temperature sensitive member for detecting the temperature of hot water heated by the heat exchanger 2.
[0010]
A gas pipe 15 extends to the gas burner 3. The gas pipe 15 is provided with a gas electromagnetic valve 16 for opening and closing the gas passage, a gas proportional valve 17 for controlling the gas supply amount, and the like. An ignition electrode 18 such as an igniter is provided in the vicinity of the burner. The main body controller 5 and the remote controller 6 are connected via a communication interface, and the state of the water heater main body is determined based on detection signals from various sensors other than the temperature sensor 14 and the water amount sensor 12, and the control from the remote controller 6 is performed. Based on the signal, the operation of each part (for example, a gas solenoid valve, a gas proportional valve, etc.) of the water heater main body is controlled. Reference numeral 19 denotes a water amount adjusting valve for adjusting the amount of water provided in the water pipe, which is driven by a servo motor to adjust the amount of water.
[0011]
21 is a bathtub provided in the bathroom, 22 is a bath hot water pipe extending from the hot water outlet pipe 10 of the water heater to the bathtub 21, and a bathroom currant 23 is provided at the end thereof. Reference numeral 24 denotes a general hot water supply pipe that is branched from the bath hot water supply pipe 22, and a kitchen currant 25 is provided at the end thereof.
[0012]
And the elongate plate 30 as shown in FIG. 2 is inserted in the water exchanger 2 mentioned above toward the water flow direction. The material of the plate 30 can be a thin plate made of stainless steel or copper.
[0013]
The plate 30 has a semicircular portion 31 and a connecting portion 32, and the remaining portion is cut away. As a method for forming the notch, for example, a process by punching such as a press process can be recommended.
[0014]
The semicircular portion 31 described above is connected to the main body of the plate 30 by a connecting portion 32 as shown in FIGS. These semicircular portions and connecting portions are configured as a pair, and a plurality of the semicircular portions and the connecting portions are provided in the insertion direction.
[0015]
The arc portion 33 of the semicircular portion 31 has substantially the same shape as the inner circular portion 35 of the water pipe 34 of the water heater heat exchanger 2.
[0016]
In addition, the shoulder portions 36 and 37 of the semicircular portion 31 are provided with cutouts 38 and 39 that are continuously cut from the connecting portion 32 in a U-shape. Note that the notch is not U-shaped but may be a V-shaped one. Moreover, the whole may be a crescent. In short, what is necessary is just to reduce the water flow resistance during water flow.
[0017]
Further, the plate 30 is provided with a twisted portion 40 at a portion located in the middle of the vertically long connecting portion 32. The twisted portion 40 twists the semicircular portion 31 approximately 90 degrees with respect to the longitudinal direction of the plate 30. The twist angle is not necessarily 90 degrees, and may be in the range of 70 degrees to 90 degrees. Further, the plurality of semicircular portions 31 may be twisted at different angles with respect to the longitudinal direction at alternate or spaced intervals.
[0018]
Further, the semicircular portion 31 after being twisted is configured such that the end surface of the arc portion 33 at the lower end thereof is in contact with the inner surface of the water pipe 34. Note that depending on the twist angle, it does not necessarily mean that they are in close contact with each other, so long as the boiling water partially boiled is received by the semicircular portion so as to be easily captured.
[0019]
Next, a mechanism for causing partial boiling will be described with reference to FIG. In the figure, reference numeral 41 denotes a plurality of heat-absorbing fins that penetrate the water pipe 34, and 42 denotes a heat exchanger body plate that surrounds the water pipe and the fins from the side.
[0020]
The gas burner 3 is located below the fin 41. When gas is supplied to the gas burner 3 and ignited, the combustion gas flows along the outer peripheral lower surface of the lower half of the water pipe 34 as indicated by the arrow, and the water pipe 34 The heat exchange with the water in the water pipe 34 is performed via the fins 41. At this time, the heat load applied to the water pipe 34 increases in the portion where the combustion gas is strongly hit.
That is, the lower surface portion 43 of the water pipe 34 facing the gas burner has a larger heat load than the other portions, so that the lower surface portion 43 is partially boiled.
[0021]
Therefore, in the embodiment of the present invention, a semicircular portion 31 having substantially the same shape as the inner circular portion of the water tube is formed on the elongated plate 30 inserted into the water tube 34 and the connecting portion 32 that connects the semicircular portion 31 is formed. Is twisted so that the arc portion of the semicircular portion is arranged along the lower inner surface of the water pipe.
[0022]
Thus, the end surface of the arc portion 33 formed in the semicircular portion 31 is in contact with the inner circular portion 35 that is the inner peripheral surface of the lower portion of the water pipe 34, and a part of the heat load transfers heat from the semicircular portion 31. The water in the water pipe 34 is absorbed.
In addition, the boiling water generated in the lower part of the water pipe positioned between the plurality of semicircular plates rises, but is blocked in the vicinity of the semicircular part 31, while the cold running water and the twisting part 32 proceeding from the upper half of the water pipe 34. Disturbed and mixed in the vicinity. This behavior occurs simultaneously at all points in the water pipe where the plate 30 is inserted. As a result, partial boiling is reduced, and a boiling sound due to boiling can be prevented.
[0023]
In addition, since the upper half of the water pipe 34 is only the resistance of the thickness of the plate 30, the resistance due to water flow is relatively small as compared with the conventional one, and a large resistance is generated in the entire water pipe. It ’s gone.
[0024]
In particular, both shoulder portions of the semicircular portion 31 are notched in a U-shape, and the portion connected to the connecting portion 32 is formed in a crescent shape or a bowl shape, thereby further reducing the water flow resistance and at the same time twisting portion 40. Disturbing action is promoted.
Moreover, disturbance and turbulent action are also generated in both crescent-shaped wings, and boiling water can be further reduced.
[0025]
In addition, embodiment mentioned above shows suitable embodiment of this invention, This invention is not limited to this, Various design changes are possible within the range.
For example, the arc portion of the semicircular portion may be configured so that the end surface thereof is along the inner surface of the water pipe, and the twisted portion is not necessarily perpendicular to the longitudinal direction of the plate.
Further, the semicircular portion may be formed separately and connected without being provided integrally with the plate.
Moreover, although the hot water heater using gas as fuel has been described, it is needless to say that oil may be used as fuel.
[0026]
【The invention's effect】
The present invention has the above-described configuration and action. According to the heat exchanger for a water heater according to claim 1, an endothermic fin for heat exchange, a water pipe inserted through the endothermic fin, and an inside of the water pipe, In the case of providing an elongated plate to be inserted in the direction of water flow, the plate is provided with a semicircular portion and a connecting portion for connecting the semicircular portion and the plate, and the arc portion of the semicircular portion is connected to the water pipe. The semicircular arc portion of the elongated plate is formed along the inner surface of the water pipe so that the connecting portion is provided with a twisted portion and the arc portion of the semicircular portion is formed along the inner surface of the water pipe. By making this arc shape almost the same as the shape and along the inner surface of the water tube, at least the upper half of the cross section of the water tube forms a channel without resistance to water flow, and the flowing water flowing through this channel flows at a high speed. Is also smooth and occurs at the bottom of the water pipe Partial boiling water is mixed disturbance with the flowing water in the vicinity of the torsion portion, it is to flow out.
Further, according to the heat exchanger for hot water supply according to claim 2, an endothermic fin for heat exchange, a water pipe inserted through the endothermic fin, and an elongated part inserted inside the water pipe toward the water passing direction. The plate is provided with a semicircular part and a connecting part for connecting the semicircular part and the plate, and the arc part of the semicircular part has substantially the same shape as the inner circular part of the water pipe. Further, since both shoulder portions of the semicircular portion are cut out in a U-shape, and the connecting portion is provided with a twisted portion so that the arc portion of the semicircular portion extends along the inner surface of the water tube, the semicircular portion of the plate By cutting out both shoulders into a U-shape, in addition to the above features, the U-shaped part became a water passage, the water passage cross-sectional area increased, the water passage resistance further decreased, and was generated from the lower part of the water pipe Mixing with partially boiling water also becomes quick and can reduce boiling sound In the heat exchanger for a hot water heater of the present invention, the semicircular portion of the plate is twisted by approximately 90 degrees with respect to the longitudinal direction of the plate. The mixing disturbance is promoted, and the reduction of the boiling sound is further improved.
[Brief description of the drawings]
FIG. 1 is an overall configuration diagram of a water heater to which the present invention is applied.
FIG. 2 is an overall view of a plate showing an embodiment of the present invention. .
FIG. 3 is a cross-sectional view showing a relationship between a water pipe and a plate showing an embodiment of the present invention.
FIG. 4 is a cross-sectional view of a water tube as viewed from the side.
FIG. 5 is an explanatory diagram showing the flow of combustion gas.
FIG. 6 is a partially enlarged view of a plate.
[Explanation of symbols]
DESCRIPTION OF SYMBOLS 1 Water heater 2 Heat exchanger 3 for water heaters Gas burner 6 Remote control 11 Water pipe 30 Plate 31 Semicircular part 32 Connection part 33 Arc part 34 Water pipe 35 Inner circular part 36 Both shoulder part 37 Both shoulder part 38 Notch 39 Notch 40 Twist Ridge part 41 Fin 42 for absorbing heat

Claims (3)

An endothermic fin for heat exchange, a water pipe inserted through the endothermic fin, and an elongated plate that is inserted into the water pipe in the direction of water passage are provided. A semicircular part and a connecting part for connecting the plate are provided, the arc part of the semicircular part is substantially the same shape as the inner circular part of the water pipe, and the twisted part is provided in the connecting part, and the arc part of the semicircular part A heat exchanger for a hot water heater, characterized in that it is configured along the inner surface of the water pipe. An endothermic fin for heat exchange, a water pipe inserted through the endothermic fin, and an elongated plate that is inserted into the water pipe in the direction of water passage are provided. A semicircular portion and a connecting portion for connecting the plate are provided, the arc portion of the semicircular portion is substantially the same shape as the inner circular portion of the water pipe, and both shoulder portions of the semicircular portion are cut out in a U shape, And the torsion part is provided in the said connection part, and the circular arc part of the semicircle part was comprised so that a water pipe inner surface might be followed, The heat exchanger for water heaters characterized by the above-mentioned. The heat exchanger for a water heater according to claim 1 or 2, wherein the semicircular portion is twisted by approximately 90 degrees with respect to the longitudinal direction of the plate.

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