JP2009281702A - Storage water heater - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To improve heat efficiency by efficiently transferring heat of a combustion gas to hot water in a hot water storage chamber. <P>SOLUTION: An outer cylinder 14 covering the hot water storage chamber 3 in a noncontact state and provided with an exhausting section at its upper end, is disposed around the hot water storage chamber 3 to form a closed space 17 except for the flue 9 and the exhausting section 16, and a partitioning cylinder 18 composed of an upper cover section 19 covering an upper end opening of the flue 9 in a noncontact state, and a hanging section 21 covering the circumference of the hot water storage chamber 3 in a noncontact state is disposed in the space 17, to partition the inside of the space 17 into a descending pathway 24 for allowing the combustion gas discharged from an upper end opening of the flue 9 to descend between the hot water storage chamber 3 and the partitioning cylinder 18, and an ascending pathway 25 communicated with the descending pathway 24 at their lower ends and allowing the combustion gas to raise between the outer cylinder 14 and the partitioning cylinder 18 to the exhausting section 16. <P>COPYRIGHT: (C)2010,JPO&INPIT

Description

  The present invention relates to a hot water storage type hot water heater that heats hot water stored in a hot water storage chamber to a predetermined temperature and keeps it warm.

  As shown in Patent Document 1, the hot water storage type water heater is closed at the top and bottom with an end plate formed with a constricted portion that is convex upward above a cylindrical main body, and a spiral exhaust passage ( It is known that a hot water storage chamber provided with a flue) is formed, and a combustion chamber in which a burner is disposed below the hot water storage chamber. That is, high-temperature combustion gas from combustion of the burner enters the exhaust passage while heating the lower end plate, and rises spirally in the exhaust passage, thereby raising the temperature of hot water in the hot water storage chamber.

JP 2001-304691 A

  However, in the hot water storage type hot water heater, since the combustion gas passes only through the exhaust passage at the center of the hot water storage chamber, the heat transfer area between the combustion gas and the hot water in the hot water storage chamber is small, resulting in energy loss.

  Therefore, the present invention aims to provide a hot water storage type water heater that can reduce such energy loss and efficiently transfer the heat of combustion gas to hot water in a hot water storage room to improve the thermal efficiency. is there.

In order to achieve the above-mentioned object, the invention described in claim 1 is characterized in that an outer cylinder is provided around the hot water storage chamber so as to cover the hot water storage chamber in a non-contact manner, and an exhaust portion is formed at the upper end. In addition to forming a space that is closed except for, a partition cylinder is provided in the space that includes an upper lid portion that covers the upper end opening of the flue in a non-contact manner and a hanging portion that covers the periphery of the hot water storage chamber in a non-contact manner. , A downward passage through which the combustion gas discharged from the upper end opening of the flue descends between the hot water storage chamber and the partition tube, and the lower passage and the lower end communicate with each other, and the combustion gas flows between the outer tube and the partition tube. It is characterized in that it is partitioned into an ascending passage leading up to the exhaust part.
In order to easily position the partition tube in the space in the configuration of claim 1, the invention according to claim 2 is provided between the outer tube and the partition tube and between the partition tube and the hot water storage chamber. A spacer for positioning the partition tube in the space is provided.
According to a third aspect of the present invention, in the configuration of the second aspect, in order to dispose the spacer at an appropriate position for positioning of the partition tube, the spacer is placed on the upper and lower portions of the hanging portion in the partition tube, respectively. A plurality of the sensors are arranged at predetermined intervals in the direction.
According to a fourth aspect of the present invention, in the configuration of any one of the first to third aspects, the upper end opening of the flue and the upper lid of the partition tube are securely maintained in order to reliably maintain the flow of the combustion gas from the flue to the descending passage. It is characterized in that the interval between the parts is at least one quarter of the inner diameter of the flue.

According to the first aspect of the present invention, since the combustion gas passes around the hot water storage chamber in addition to the flue, a large heat transfer area between the combustion gas and the hot water in the hot water storage chamber can be secured. Therefore, energy loss is reduced, leading to improvement in thermal efficiency.
According to the second aspect of the present invention, in addition to the effect of the first aspect, the partition tube can be easily positioned in the space. In particular, the spacer between the partition tube and the hot water storage chamber exerts an effect of suppressing the flow by interfering with the combustion gas in the descending passage, so that the residence time of the combustion gas in the descending passage becomes longer, and the thermal efficiency Further improvement can be expected.
According to the third aspect of the present invention, in addition to the effect of the second aspect, the spacer can be disposed at an appropriate position for positioning the partition tube, and the descending passage and the ascending passage are formed without causing a bias in the passage area. It becomes possible.
According to the fourth aspect of the invention, in addition to the effect of any one of the first to third aspects, the flow of the combustion gas from the flue to the descending passage can be reliably maintained even if the partition tube is provided.

Hereinafter, embodiments of the present invention will be described with reference to the drawings.
FIG. 1 is an explanatory view showing an example of a hot water storage type water heater. The hot water storage type water heater 1 closes a cylindrical inner body 4 and the upper and lower sides of the inner body 4 above the inside of a cylindrical main body 2. A hot water storage chamber 3 comprising an upper end plate 5 and a lower end plate 6 is formed, and a combustion chamber 7 having a burner 8 is formed below the hot water storage chamber 3. A hot water supply pipe for supplying water into the hot water storage chamber 3 and a hot water supply pipe for taking out the hot water in the hot water storage chamber 3 (both not shown) are provided above the hot water storage chamber 3.

  In addition, a cylindrical flue 9 is provided at the axial center of the hot water storage chamber 3 so as to pass through the upper end plate 5 and the lower end plate 6 and open up and down. A belt-like plate 10 is erected in a fashion that is divided into two. As shown in FIG. 2, a plurality of semicircular cuts 11, 11,... Are formed in the plate 10 at predetermined intervals in the vertical direction. Projecting pieces 12 that are adjacent to the inner surface of the road 9 and that are vertically adjacent to each other are cut and raised so as to be alternately oriented to the front and back of the plate 10. Due to the formation of the projecting pieces 12, communication holes 13, 13... Are formed in the plate 10 so that the front and back sides communicate with each other in the flue 9.

Further, as shown in FIGS. 3 and 4, an outer cylinder 14 that covers the hot water storage chamber 3 from above without contact is provided outside the hot water storage chamber 3. The outer cylinder 14 has a lower peripheral edge connected to the outer periphery of the lower end of the inner cylinder 4 and a closing plate 15, while the upper end is tapered toward the center and is an exhaust part provided at the center of the upper surface of the main body 2. 16. Therefore, a space 17 is formed outside the hot water storage chamber 3 so as to be surrounded by the outer cylinder 14 and the closing plate 15 and to cover the entire outer periphery of the hot water storage chamber 3 and communicate with the flue 9 and the exhaust part 16.
18 is a partition cylinder that covers the hot water storage chamber 3 from above in the space 17, and an upper lid portion 19 that covers the upper end opening of the flue 9 in a non-contact manner by upper spacers 20 and 20 provided between the upper end plate 5 and the upper lid portion 19. It consists of a cylindrical hanging part 21 that hangs down from the periphery of the upper lid part 19 and covers the periphery of the hot water storage chamber 3 in a non-contact manner. The lower end of the hanging part 21 is formed shorter than the outer cylinder 14. Here, the distance between the upper end opening of the flue 9 and the upper lid portion 19 of the partition tube 18 is ¼ or more of the inner diameter of the flue 9.

  Further, a plurality of lateral spacers 22, 23... Each having a circular protrusion at the center are provided in the circumferential direction at upper and lower portions of the inner surface of the outer cylinder 14 and the inner surface of the hanging part 21 of the partition cylinder 18. The lateral spacers 22 on the outer cylinder 14 side are in contact with the outer surface of the hanging part 21 of the partition cylinder 18, and the lateral spacers 23 on the hanging part 21 side are in contact with the outer surface of the inner cylinder 4. Therefore, the partition cylinder 18 is supported in a manner that bisects the space 17, and the combustion gas descends between the hot water storage chamber 3 and the hanging portion 21 of the partition cylinder 18 from the upper end opening of the flue 9 in the space 17. , And the combustion gas turned back at the lower end of the hanging portion 21 rises between the outer cylinder 14 and the partition cylinder 18 outside the lowering passage 24 and is exhausted. It is divided into a rising passage 25 that reaches the portion 16.

  A controller 26 having a solenoid valve for controlling the supply of fuel gas to the burner 8 is provided outside the main body 2. The controller 26 includes the main body 2, the outer cylinder 14, the partition cylinder 18, and the inner cylinder. A thermostat 27 that penetrates 4 and protrudes into the hot water storage chamber 3 is provided. A drain discharge pipe 28 is connected to the closing plate 15 and discharges the drain stored in the closing plate 15 to the lower side of the combustion chamber 7.

  In the hot water storage type water heater 1 configured as described above, when an ignition knob of the controller 26 is pushed, a pilot burner (not shown) is first ignited. When this ignition is detected by a thermocouple (not shown), the solenoid valve of the gas flow path is held open. Therefore, when the ignition knob is operated as it is to open the main gas flow path, the fuel gas is ejected from the gas nozzle, and the burner 8 To be supplied. Therefore, the burner 8 burns from the pilot burner.

The high-temperature combustion gas generated by the combustion of the burner 8 rises along the lower surface of the lower end panel 6 and enters the central flue 9. As shown by the arrow in FIG. 1, the combustion gas that has entered the flue 9 abuts against the projecting piece 12, is guided to the center, passes through the communication hole 13, and moves to the opposite side of the plate 10. It abuts against the protruding piece 12 on that side. By repeating this, the inside of the flue 9 rises in a meandering manner to generate turbulent flow, so that a long heat transfer distance between the combustion gas and the hot water in the hot water storage chamber 3 is ensured, and the thermal efficiency is improved.
Further, the combustion gas discharged from the flue 9 stays and fills in the descending passage 24 in the space 17 and overflows downward from the descending passage 24. The air enters the ascending passage 25 and rises, and is discharged from the exhaust portion 16 to the outside. Therefore, heat exchange between the combustion gas in the descending passage 24 and the hot water is also performed outside the hot water storage chamber 3. At this time, since the space between the upper end opening of the flue 9 and the upper lid portion 19 of the partition cylinder 18 is sufficiently secured with respect to the inner diameter of the flue 9, the combustion gas from the flue 9 to the descending passage 24 There is no hindrance to the flow.

  Thus, according to the hot water storage type water heater 1 of the said form, the outer cylinder 14 which covers the hot water storage chamber 3 non-contactingly around the hot water storage chamber 3, and the exhaust part 16 is formed in the upper end is provided, and a flue 9 and the exhaust part 16 are formed, and a closed space 17 is formed. In the space 17, the upper lid part 19 that covers the upper end opening of the flue 9 without contact and the periphery of the hot water storage chamber 3 are covered without contact. A partition pipe 18 comprising a hanging part 21 is provided, and a downward passage 24 in which combustion gas discharged from the upper end opening of the flue 9 descends between the hot water storage chamber 3 and the partition cylinder 18 in the space 17, The lower passage communicates with the lower end passage, and the combustion gas rises between the outer cylinder 14 and the partition cylinder 18 and is divided into an ascending passage 25 that reaches the exhaust portion 16, so that the hot water storage chamber is added to the flue 9. Since the combustion gas also passes around 3, the heat transfer area between the combustion gas and the hot water in the hot water storage chamber 3 is reduced. It is possible to hear secured. Therefore, energy loss is reduced, leading to improvement in thermal efficiency.

  In particular, here, spacers (an upper spacer 20 and lateral spacers 22 and 33) for positioning the partition tube 18 in the space 17 are provided between the outer tube 14 and the partition tube 18 and between the partition tube 18 and the hot water storage chamber 3. By providing each, the positioning of the partition cylinder 18 in the space 17 can be easily performed. Further, the horizontal spacer 23 between the partition cylinder 18 and the hot water storage chamber 3 exhibits an action of interfering with the combustion gas in the descending passage 24 and suppressing its flow, so that the combustion gas stays in the descending passage 24. Time can be lengthened and further improvement in thermal efficiency can be expected.

Further, a plurality of the horizontal spacers 22 and 23 are arranged at a predetermined interval in the circumferential direction of the hanging part 21 at the upper and lower portions of the hanging part 21 in the partitioning cylinder 18, so that the lateral spacers 22 and 23 are arranged on the partitioning cylinder 18. It is possible to dispose the descending passage 24 and the ascending passage 25 without causing a bias in the passage area.
Further, since the interval between the upper end opening of the flue 9 and the upper lid portion 19 of the partition tube 18 is set to one quarter or more of the inner diameter of the flue 9, it is lowered from the flue 9 even if the partition tube 18 is provided. The flow of the combustion gas to the passage 24 can be reliably maintained.

In addition, the form of the spacer is not limited to the form in which the horizontal spacer is fixed to the outer cylinder or the partition cylinder as described above, the horizontal spacer is fixed to the inner and outer surfaces of the partition cylinder, the inner surface of the outer cylinder, and the outer surface of the hot water storage chamber. It is possible to form a passage even if a horizontal spacer is fixed to the wall. In addition to the circular protrusion, it is also possible to change the shape such as an L-shaped spacer whose tip protrudes horizontally.
Furthermore, the arrangement form is not limited to the structure in which the arrangement is divided in the upper and lower directions and can be appropriately selected such that the arrangement is uniformly arranged over the entire circumferential surface of the hot water storage room, or a plurality of rows are arranged alternately.
In addition to fixing a separate spacer, as shown in FIG. 5, for example, circular projections 29, 29,... The outer cylinder 14 or the hot water storage chamber 3 may be contacted. If it does in this way, a spacer will be integrally provided with formation of a partition cylinder, and a retrofit process will become unnecessary. Of course, it can also be provided on the outer cylinder.

In addition, the structure of the hot water storage water heater itself can be appropriately changed in design, for example, by forming a spiral passage instead of a plate in the flue, or by using a primary air type burner instead of a Bunsen type.

It is explanatory drawing of a hot water storage type water heater. It is explanatory drawing of a plate. It is an enlarged view of the upper part of a hot water storage type water heater. It is an enlarged view of the lower part of a hot water storage type water heater. It is explanatory drawing which shows the example of a change of a spacer.

Explanation of symbols

  1. Hot water storage type water heater, 2. Main body, 3. Hot water storage chamber, 4. Inner trunk, 5. Upper end plate, 6. Lower end plate, 7. Combustion chamber, 8. Burner, 9. · Flue, 10 · · Plate, 12 · · Projection piece, 14 · · Outer tube, 17 · · Space, 18 · · Partition tube, 19 · · Upper lid portion, 21 · · Suspension portion, 22, 23 · · Side Spacer, 24 ·· Descent passage, 25 ·· Rise passage, 26 ·· Controller, 29 ·· Circular protrusion.

Claims (4)

A hot water storage chamber is formed in the upper part of the cylindrical body, and a combustion chamber having a burner is formed in the lower part, and a cylindrical flue through which the combustion gas of the burner passes is formed in the axial center of the hot water storage chamber. A hot water storage type water heater that can heat hot water in the hot water storage chamber by combustion of the burner,
Around the hot water storage chamber, the hot water storage chamber is covered in a non-contact manner, and an outer cylinder having an exhaust portion formed at the upper end is provided to form a closed space except for the flue and the exhaust portion. In the interior, a partition tube is provided which includes an upper lid portion that covers the upper end opening of the flue in a non-contact manner and a hanging portion that covers the periphery of the hot water storage chamber in a non-contact manner, and the upper end opening of the flue is formed in the space. The combustion gas discharged from the lowering passage through which the hot water storage chamber and the partition tube are lowered, and the lower passage and the lower end communicate with each other, so that the combustion gas rises between the outer tube and the partition tube, and A hot water storage type hot water heater characterized by being partitioned into an ascending passage leading to an exhaust section.   The hot water storage type hot water supply according to claim 1, wherein spacers for positioning the partition tube in the space are provided between the outer tube and the partition tube and between the partition tube and the hot water storage chamber, respectively. vessel.   The hot water storage type hot water heater according to claim 2, wherein a plurality of the spacers are arranged at a predetermined interval in a circumferential direction of the hanging part at upper and lower portions of the hanging part in the partition tube.   The hot water storage system according to any one of claims 1 to 3, wherein an interval between an upper end opening of the flue and an upper lid portion of the partition tube is set to one quarter or more of an inner diameter of the flue. Water heater.

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