JP2020024074A - Relay pipe for water heater, water heater and method for recombining water heater - Google Patents

Abstract

To make a main configuration common regardless of the presence/absence of an instantaneous hot water supply function, to reduce a manufacturing cost and a management cost greatly.SOLUTION: A water supply pipe 19 connected to a heat exchanger of a water heater has a dividing part 21, and the dividing part 21 incorporates a relay pipe 22 for the water heater, which constitutes a part of the water supply pipe 19. The relay pipe 22 for the water heater projects orthogonally outward in a radial direction between the inlet end part and the outlet end part in a straight pipe whose inlet end part and outlet end part are connected to both ends of the dividing part 21 by clips 24, 24, and a branch pipe part 23 to which a return pipe 25 for a circulation path can be connected is formed in a branched manner.SELECTED DRAWING: Figure 4

Description

  The present invention provides a water heater relay pipe used as a part of a water heater water supply pipe, a water heater using the water heater relay pipe, and a water heater using the water heater relay pipe to select whether or not a hot water supply function is provided. It relates to the rearrangement method.

  2. Description of the Related Art There is known a water heater having a hot water function by connecting a return pipe equipped with a circulation pump to a water supply pipe connected to a heat exchanger (for example, see Patent Document 1). In this hot water supply device with a hot water function, a circulation path is formed between the tapping pipe, the external pipe, the return pipe, and the water supply pipe by connecting the tapping pipe and the return pipe with an external pipe, and the circulation path is circulated through the circulation path. Heating operation is possible by heating with a heat exchanger while circulating hot and cold water with a pump. Therefore, when the hot water tap provided on the external pipe is opened, hot water can be immediately supplied.

JP 2004-286397 A

  On the other hand, a water heater without a hot water function does not have such a return pipe or a circulation pump, so when manufacturing a water heater with a hot water function and a water heater without a hot water function, separate housings are required. And water supply circuit components must be manufactured and assembled, resulting in increased manufacturing and management costs.

  Therefore, the present invention provides a hot water supply that can greatly reduce the manufacturing cost and the management cost by sharing the main configuration regardless of the presence or absence of the hot water function, and can easily perform the rearrangement of the presence or absence of the hot water function. It is an object of the present invention to provide a relay pipe for a device, a water heater using the relay pipe for a water heater, and a method for rearranging a water heater using the relay pipe for the water heater.

In order to achieve the above object, an invention according to claim 1 is a relay pipe for a water heater that constitutes a part of a water pipe connected to a heat exchanger of a water heater,
A branch connecting portion capable of connecting a return pipe for a circulation path is formed between an inlet end and an outlet end connected to the water supply pipe.
According to a second aspect of the present invention, in the configuration of the first aspect, the flow path in the branch connection portion is closed by a thin portion.
In order to achieve the above object, the invention according to claim 3 is a water heater, which includes a burner and a heat exchanger, a water supply pipe connected to the heat exchanger, and a tap water pipe connected to the heat exchanger. And the relay pipe for a water heater according to claim 1 or 2 is incorporated in a part of the water supply pipe.
In order to achieve the above object, the invention according to claim 4 is a method for assembling a water heater, comprising a burner and a heat exchanger, a water supply pipe connected to the heat exchanger, and a water heater connected to the heat exchanger. A plurality of hot water supply pipes each having a hot water supply pipe, wherein a split portion is formed in a part of the water feed pipe, and the relay pipe for a water heater according to claim 1 is provided in any of the split portions; By selecting and incorporating any of the thin-walled portions removed in the hot water supply relay pipe described in the above, while making the hot water supply compatible with the hot water function,
By selecting and incorporating any of the relay pipe for a water heater according to claim 2 and a separate straight pipe into any of the other dividing portions, it is possible to provide a water heater that does not correspond to the quick hot water function. Features.

ADVANTAGE OF THE INVENTION According to this invention, the adoption of the relay pipe for water heaters makes it possible to greatly reduce the manufacturing cost and the management cost by sharing the main configuration regardless of the presence or absence of the hot water function, and to rearrange the presence or absence of the hot water function. Can also be easily performed.
In particular, according to the second aspect of the present invention, in addition to the above-described effects, one relay pipe for a water heater can be selectively used with a hot water function and without a hot water function depending on whether the thin portion is removed or left as it is. Therefore, it is more advantageous in terms of cost.

It is a front view of a water heater. It is a bottom view of a water heater. It is a front view in the state where the front cover was removed. It is the enlarged view of the housing lower part which looked at the return pipe from the front. It is explanatory drawing of the relay pipe for water heaters, (A) shows a side surface, (B) shows the AA cross section, (C) shows a perspective view, respectively. It is sectional drawing of the check valve part in a return pipe. It is the schematic of the quick hot water system using the water heater in which the relay pipe for water heaters was incorporated. It is the schematic of the water heater which does not have the hot water function which incorporated the relay pipe for water heaters. It is explanatory drawing of the example of a change of the relay pipe for water heaters, (A) shows a side surface, (B) shows the BB cross section, respectively.

Hereinafter, embodiments of the present invention will be described with reference to the drawings.
FIG. 1 is a front view showing an example of a water heater, and FIG. 2 is a bottom view. The water heater 1 has a housing 2 including a box body 3 having five closed surfaces except the front surface, and a front cover 4 having a closed front surface of the box body 3. As shown in FIG. 3 with the front cover 4 removed, a combustion device 5 including a burner unit 6, a heat exchanger 7, and an exhaust hood 8 is installed in the housing 2 from below. An exhaust pipe 9 provided at the upper end of the box main body 3 projects upward through the upper plate of the box body 3. At the top and bottom of the back of the box body 3, mounting brackets 10, 10 for installation on an indoor wall or the like are provided, and a plurality of air supply ports 11, 11,. I have.
At the bottom of the box body 3, a tubular gas connection port 12 to which an external gas pipe is connected, a tubular water supply port 13 to which an external water supply pipe is connected, and a tubular gas connection to which an external hot water supply pipe is connected. A hot water supply connection port 14 and a tubular return connection port 15 are provided.

The burner unit 6 includes a plurality of burners (not shown) therein. The burner unit 6 is connected to a gas connection port 12 to supply fuel gas to the burners, and includes a gas pipe 16 having a base valve and a proportional control valve (not shown). A fan 17 for connection and supplying combustion air to the burner is provided.
The heat exchanger 7 has a heat transfer tube 18 that penetrates a plurality of fins (not shown) in a meandering shape, and a water supply tube 19 connected to the water supply connection port 13 is connected to an input end of the heat transfer tube 18. A tapping pipe 20 connected to the hot water supply connection port 14 is connected to an outlet end of the heat transfer pipe 18.

As shown in FIG. 4, the water supply pipe 19 is partially formed with a partial dividing portion 21. The dividing portion 21 has a separate water heater relay pipe (hereinafter simply referred to as a “relay pipe”). 22) are incorporated. The relay pipe 22 is a straight pipe whose input side end and output side end are connected to both ends of the dividing section 21 by clips 24, 24, and between the input side end and the output side end. As shown in FIG. 5, a branch pipe portion 23 as a branch connection portion projecting orthogonally outward in the radial direction is formed to be branched, and a flow path in the branch pipe part 23 is communicated with a flow path in the relay pipe 22. ing.
A return pipe 25 is provided between the branch pipe section 23 and the return connection port 15. The upstream end of the return pipe 25 is connected to a return connection port 15, a non-self-priming type circulating pump 26 to which a downward suction pipe 26 a is connected to the return connection port 15, and a lateral discharge pipe 26 b of the circulation pump 26. And a branch pipe portion 23 connected to the downstream end of the horizontal pipe 27. By connecting the ends of the pipes with clips 28, 28,..., A return pipe 25 is formed from the return connection port 15 to the relay pipe 22.

The horizontal pipe 27 is provided with a downward branch pipe 29. The lower end of the branch pipe 29 is connected to the bottom plate of the box body 3 and is open to the outside. A plug 30 is screwed and fixed to the lower end from below so that the branch pipe 29 can be arbitrarily opened. As shown in FIG. 6, a check valve 31 is provided at the downstream end of the pipe 27 to prevent the water from flowing backward from the water supply pipe 19 to the circulation pump 26 side.
Here, the horizontal pipe 27 and the branch pipe 29 are integrally formed to form a T-shaped unit in which the check valve 31 is incorporated in the horizontal pipe 27, so that the horizontal pipe 27 and the branch pipe 29 can be easily attached to and detached from the instrument. .

In the water heater 1 configured as described above, the circulating pump 26 and the T-shaped pipe (with the check valve 31) are provided by using the relay pipe 22 with the branch pipe section 23 as the dividing section 21 of the water supply pipe 19. If the horizontal pipe 27 and the branch pipe 29) are incorporated as the circulation path forming unit U, the quick-hot water function can be easily provided.
FIG. 7 schematically shows a hot water system 40 using the water heater 1, and omits components other than those relating to the circulation path. Reference numeral 32 denotes a bypass pipe that connects the water supply pipe 19 and the tapping pipe 20 to bypass the heat exchanger 7.
The hot water system 40 is constructed by connecting an external pipe 41 having a plurality of hot water taps 42 between the hot water supply connection port 14 and the return connection port 15. Thereby, the hot water discharged from the tapping pipe 20 returns to the return pipe 25 through the external pipe 41 and forms a circulation path to the heat exchanger 7 via the water supply pipe 19. Therefore, the burner is burned by the burner unit 6 while circulating hot and cold water in the circulation path by the operation of the circulation pump 26, so that a heat retaining operation at a set temperature set by a controller (not shown) provided in the appliance becomes possible. . That is, hot water can be supplied immediately by opening any of the hot water taps 42.

  On the other hand, when the hot water function is not provided, as shown in FIG. 8, in the water heater 1A of the same form having the water pipe 19 having the dividing section 21, the dividing section 21 is a straight pipe having no branch pipe section. What is necessary is just to connect the tube 22A. When the housing 2 is shared, a through hole for providing the return connection port 15 and the branch pipe 29 remains on the bottom surface of the box body 3, but the through hole is closed by fitting a rubber stopper or the like. Can be used without any problems. Therefore, components other than the relay pipe 22A are common to the water heater 1.

As described above, according to the relay pipe 22 and the water heater 1 of the above-described embodiment, the return pipe 25 for the circulation path can be connected between the input end and the output end connected to the water supply pipe 19. By using the relay pipe 22 in which the branch pipe section 23 is formed in a branched manner, the water heater 1 capable of supporting the quick hot water function can be easily formed. Moreover, since the main configuration of the water heater 1 other than the relay pipe 22 can be shared with another water heater 1A that does not support the hot water function, manufacturing costs and management costs can be greatly reduced.
In addition, by installing the relay pipe 22 in the dividing part 21 of the water supply pipe 19 of the water heater 1, the water heater 1 can be adapted to the hot water function, while the dividing part 21 of the water supply pipe 19 of the water heater 1 </ b> A By incorporating the relay pipe 22A, which is a separate straight pipe, the water heater 1A does not correspond to the hot water function, so that the main configuration other than the relay pipes 22 and 22A and the return pipe 25 is the same. And the water heater 1A, and the manufacturing cost and the management cost can be greatly reduced.

In the above-described embodiment, the rearrangement method of selecting the relay pipe 22 with the hot water function and another relay pipe 22A without the hot water function is adopted. However, when such separate relay pipes are used, The present invention is not limited to this. As shown in FIG. 9, a relay pipe 22 </ b> B in which a thin wall 23 a is formed in the branch pipe 23 and the flow path is closed may be used. In this case, when the hot water function is provided, if the thin portion 23a is removed by punching or the like, the thin portion 23a can be connected to the return pipe 25 by being incorporated in the dividing section 21 of the water heater 1 like the relay pipe 22. On the other hand, when the hot water function is not provided, the thin portion 23a may be incorporated in the dividing portion 21 of the water heater 1A in the same manner as the relay pipe 22A without any change.
Also in this case, the main configuration other than the relay pipe 22B and the return pipe 25 can be shared between the water heater 1 and the water heater 1A, so that the manufacturing cost and the management cost can be greatly reduced. In particular, here, since one relay pipe 22B can be selectively used with or without the hot water function, it is more advantageous in terms of cost.

Further, the relay pipe is not limited to the one in which the branch pipe part is integrally formed, and the branch pipe part may be connected separately. The direction of the branch pipe is not limited to an orthogonal shape. However, the branch connection portion is not limited to the projecting structure as in the branch pipe portion of the above-described embodiment, and may be a through hole to which a return pipe is inserted and connected.
Further, the configuration of the water heater other than the relay pipe is not limited to the above-described embodiment, and may be a latent heat recovery type having a sub heat exchanger, a composite type having a heating circuit for a hot water supply side and a bath side or a heating side, or the like. The present invention is applicable.

  1, 1A water heater, 2 housing, 3 box body, 4 front cover, 5 combustion device, 6 burner unit, 7 heat exchanger, 8 exhaust hood , 9..exhaust pipe, 12..gas connection port, 13..water supply port, 14..hot water supply port, 15..return connection port, 16..gas pipe, 19..water supply pipe, 20 .. Tapping pipe, 21 ··· split section, 22, 22A, 22B · · · relay pipe for water heater, 23 · · · branch pipe section, 23a · · · thin section, 25 · · · return pipe, 26 · · · circulation pump, 27 · · · horizontal Pipe, 29 .. branch pipe, 30 .. plug, 31 .. check valve, 40 .. hot water system, 41 .. external piping, 42 .. hot water tap.

Claims (4)

A relay pipe for a water heater that constitutes a part of a water pipe connected to a heat exchanger of the water heater,
A relay pipe for a water heater, wherein a branch connection portion capable of connecting a return pipe for a circulation path is formed between an inlet end and an outlet end connected to the water supply pipe.   The relay pipe for a water heater according to claim 1, wherein the flow passage in the branch connection part is closed by a thin part. A burner and a heat exchanger;
A water supply pipe connected to the heat exchanger,
A tapping pipe connected to the heat exchanger,
A water heater, wherein the relay pipe for a water heater according to claim 1 or 2 is incorporated in a part of the water supply pipe. In a plurality of water heaters each including a burner and a heat exchanger, a water supply pipe connected to the heat exchanger, and a hot water supply pipe connected to the heat exchanger, a part of the water supply pipe has a dividing portion. Form each,
Immediately by selecting and installing any one of the relay pipe for a water heater according to claim 1 and the relay pipe for a water heater according to claim 2 from which a thin-walled portion is removed, in any one of the divided sections. While a water heater that can handle hot water functions is used,
A water heater that does not support the hot water function by selecting and installing any of the relay pipe for a water heater according to claim 2 and a separate straight pipe into any of the other dividing portions. A method for changing the configuration of a water heater.

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