JP2006010212A - Hot water supply system - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a hot water supply system capable of maintaining such a state by small energy, by making hot water of uncooled hot water come out immediately, when using the hot water supply system after interrupting over a long time. <P>SOLUTION: This hot water supply system 1 has a hot water supply pipe 16 for arranging a double tube part 20 between a water heater 11 and a hot water outlet part 12 for generating hot water of the predetermined temperature. An inside flow passage 22a and an outside flow passage 21a are formed in the double tube part 20, and hot air generated by a hot air generating part 36 is passed to the outside flow passage 21a, to heat or reserve heat of the hot water in the inside flow passage 22a. <P>COPYRIGHT: (C)2006,JPO&NCIPI

Description

  TECHNICAL FIELD The present invention relates to a hot water supply system that discharges hot water generated in a hot water heater or the like from a hot water discharge portion such as a currant, and in particular, relates to a hot water supply system that can quickly discharge hot water at a desired temperature.

  2. Description of the Related Art Conventionally, a hot water supply system that uses hot water supplied from a hot water supply unit such as a hot water heater is used. In such a hot water supply system, a portion for supplying hot water and a currant provided at a place where hot water is used are connected by a hot water supply pipe.

When the normally closed currant is opened, hot water generated on the hot water supply side passes through the hot water supply pipe and is discharged from the currant.
Immediately after the curan is opened, first, hot water in the hot water supply pipe comes out first, but the hot water in the hot water supply pipe dissipates heat to the outside as time passes and the temperature decreases. Therefore, when the hot water is discharged after the use of the hot water supply system is interrupted for a long time, first, the cooled hot water in the hot water supply pipe is discharged, and it takes time until the hot water having a desired temperature is discharged. Also, the cold water in the hot water supply pipe is not used and may be discarded.

For this reason, Patent Document 1 discloses a hot water supply system for so-called immediate hot water that can discharge hot water that has not been cooled even when the hot water supply system is used after being interrupted for a long time.
JP 61-89442 A

  In the hot water supply system described in Patent Document 1, a circulation path through which hot water can be circulated by a pump is provided in the hot water supply pipe, and the currant is provided in the vicinity of the circulation path. And when hot water in a circulation path is maintained at a desired temperature and the currant is opened, hot water in the circulation path can be discharged immediately.

However, in the conventional hot water supply system described in Patent Document 1 and the like, it is necessary to constantly circulate the hot water in the circulation path and maintain it at a predetermined temperature. It was.
That is, it is necessary to provide a pipe that returns from the currant side to the hot water supply side, and the hot water supply pipe tends to be longer and the heat radiation from the hot water supply pipe tends to be larger than that of a hot water supply system that does not have a circulation path. Further, in order to always operate the pump, electric power for always operating the pump is required.

In addition, when hot water in a circulation path is circulated as described in Patent Document 1 or the like, an expansion tank, an internal pressure relief valve, or the like is required to cope with changes in the temperature or pressure of the circulation path. Therefore, these equipment costs are required and maintenance of these equipment is also required.
Furthermore, since hot water always flows in the circulation path, the corrosion of the circulation path is likely to proceed, and it is necessary to replace the circulation path piping in a short period of time.

  In addition, as another measure for the hot water supply, it is conceivable that the hot water in the hot water supply pipe is kept warm by winding a sheet heater or the like having flexibility to the hot water supply pipe without using the hot water supply pipe as a circulation path. However, the planar heater is liable to break down due to disconnection or the like, and the location of the disconnection is difficult to understand. Therefore, when the disconnection occurs, the whole is replaced. In particular, when hot water supply pipes are buried in walls, ceilings, etc., if the heater breaks down, it will be necessary to take it out, replace the heater, and bury it again. there were.

  Accordingly, the present invention provides a hot water supply system that can quickly discharge hot water when used after interrupting the use of the hot water supply system for a long time, and can maintain such a state with less energy. It is an issue to provide.

  And invention of Claim 1 for achieving the above-mentioned object is a hot water heater that generates hot water of a predetermined temperature, a hot water outlet that discharges the hot water, and a hot water heater that connects the hot water heater and the hot water outlet. The hot water supply pipe is provided with a double pipe portion having an inner pipe and an outer pipe, inside the inner pipe of the double pipe portion. Has an inner flow path through which the hot water flows, and an outer flow path is formed between the outer pipe and the inner pipe of the double pipe section. The hot water supply system is characterized in that the hot water in the inner flow path can be heated or kept warm by flowing.

  According to the first aspect of the present invention, the hot water supply pipe that guides the hot water generated in the water heater to the hot water supply section is provided with a double pipe section having an inner pipe and an outer pipe, and is generated in the hot air generating section. The hot water flowing in the inner flow path can be heated or kept warm by flowing warm air through the outer flow path, so that the hot water in the hot water supply pipe can be kept warm without using the hot water supply pipe as a circulation path. it can.

  The invention described in claim 2 is characterized in that a hot air circulation path including an outer flow path and a hot air generator is formed, and the hot air generated in the hot air generator is circulated. It is a hot water supply system.

  According to the second aspect of the present invention, since the hot air circulation path for circulating the hot air generated in the hot air generation section is formed, it is possible to reuse the heat remaining after passing through the outer flow path. And the energy used can be reduced.

  Invention of Claim 3 is provided with the space | gap formation means which forms a space | gap between an outer tube and an inner tube in the outer side of the inner tube of a double pipe part, or 1 or 2 characterized by the above-mentioned. The hot water supply system according to 2.

  According to the third aspect of the present invention, a gap is formed between the outer tube and the inner tube, and direct heat conduction between the outer tube and the inner tube can be prevented. Therefore, according to the hot water supply system of the present invention, it is possible to accurately retain and heat the hot water existing in the inner pipe in preparation for the next hot water.

  The invention according to claim 4 is characterized in that a linear body is provided between the outer tube and the inner tube of the double pipe portion, and the linear body is arranged in a spiral shape. The hot water supply system according to any one of claims 1 to 3.

  According to the fourth aspect of the present invention, since the linear body arranged so as to be spiral is provided between the outer tube and the inner tube of the double tube portion, Prevents direct heat conduction between the outer tube and the inner tube by preventing contact with the tube. Therefore, the heat of the hot water in the inner channel is not easily radiated from the outer tube, and the space of the outer channel formed between the outer tube and the inner tube is secured at any position in the circumferential direction, It is possible to stably heat or heat the hot water in the inner flow path with the hot air.

  Invention of Claim 5 is a hot-water supply system in any one of Claims 1-4 by which the heat insulation member is provided in the exterior of the outer pipe | tube of a double pipe part.

  According to the invention described in claim 5, since the heat insulating member is provided outside the outer pipe of the double pipe portion, the heat radiation to the outside of the hot air flowing in the external flow path is reduced, and the energy loss is reduced. Can be reduced.

  According to the hot water supply system of the present invention, even when the hot water supply system is discharged after interrupting the use of the hot water supply system for a long time, hot hot water can be immediately discharged, and such a state can be maintained with less energy. it can.

  Hereinafter, specific examples of the present invention will be described. FIG. 1 is an operation principle diagram showing a hot water supply system according to a first embodiment of the present invention. 2 is a cross-sectional perspective view of a double pipe portion used in the hot water supply system of FIG. 3 is a cross-sectional view of a plane perpendicular to the axial direction of a double pipe portion used in the hot water supply system of FIG. 4 is a cross-sectional view showing a bent double pipe portion used in the hot water supply system of FIG. FIG. 5 is a cross-sectional view of a plane perpendicular to the axial direction showing a modification of the double pipe portion. FIG. 6 is an operation principle diagram showing a hot water supply system having a plurality of curans. Fig.7 (a) is a perspective view which shows the modification of a double pipe part, (b) is sectional drawing which shows another modification.

A hot water supply system 1 according to the first embodiment of the present invention is shown in FIG. 1, and includes a water heater 11, a currant (hot water outlet) 12, a water supply pipe 15 and a hot water supply pipe 16 connected to the water heater 11. And have.
The water supply pipe 15 is a pipe provided between the water inlet 13 and the water heater 11, and the hot water supply pipe 16 is a pipe provided between the water heater 11 and the currant 12. Then, water introduced from the water inlet 13 of the water supply pipe 15 is introduced into the water heater 11, heated by the water heater 11 to generate hot water of a predetermined temperature, and this hot water is discharged from the currant 12 through the hot water supply pipe 16. .

  The water inlet 13 is connected to a water supply or the like. In addition, the curan 12 is provided in a place where hot water is used such as a bathroom or a washroom, and can be opened and closed. When the user needs hot water, the currant 12 is opened and discharged. Can do.

The hot water heater 11 is provided with a burner (not shown), and the heat of the burner heats the incoming water to generate hot water. Then, by opening the currant 12, water is introduced into the water heater 11, and the burner is activated upon detection of water entry. In addition, the means for heating this water can use means other than a burner.
Further, the water heater 11 is provided with a temperature adjusting means (not shown) so that the user can adjust the temperature of the hot water generated by the water heater 11.

As shown in FIG. 1, the hot water supply pipe 16 is provided with a double pipe portion 20. As shown in FIG. 2 and FIG. 3, the double pipe portion 20 includes two pipes, an outer pipe 21 and an inner pipe 22, and a linear body 23 (gap forming means). The inner tube 22 is disposed in the outer tube 21, and the linear body 23 is disposed between the inner tube 22 and the outer tube 21 in a state of being spirally wound around the inner tube 22.
In addition, the double pipe part 20 may be provided in the whole region of the hot water supply pipe 16, or may be provided partially.

An inner channel 22a is formed inside the inner pipe 22, and hot water from the water heater 11 flows into the inner channel 22a. Further, an outer flow path 21a is formed between the inner pipe 22 and the outer pipe 21, and hot air generated by the hot air generating section 36 flows through the outer flow path 21a as will be described later. The outer tube 21 is a material that is less likely to transfer heat than the inner tube 22 and is excellent in heat insulation.
The material of the inner tube 22 can be appropriately selected according to installation conditions and the like. More specifically, for example, when priority is given to heat exchange with the warm air flowing in the outer flow path 21a, it is preferable to use a material with excellent heat conductivity, and priority is given to the heat insulation of the hot water existing in the inner pipe 22. In this case, it is desirable to use a material with low heat conductivity.
The linear body 23 is disposed in the outer flow path 21 a and is made of a material that is excellent in heat insulation like the outer tube 21. Resin and rubber can be used for the linear body 23, and the hollow body which has space inside can be used.

  The double pipe part 20 can be formed by winding the linear body 23 around the inner pipe 22 in a spiral shape and inserting it into the outer pipe 21, thereby easily forming the double pipe part 20. be able to. In addition, the double pipe part 20 can use a duct-shaped thing.

The double pipe part 20 is deformable and can be bent. Moreover, the length of the double pipe part 20 can be changed according to an installation place. Then, the bent portion of the double pipe portion 20 is such that the inner tube 22 and the outer tube 21 partially approach each other. However, as shown in FIG. Thus, the gap 24 can be provided.
Note that the inner tube 22 and the outer tube 21 approach each other on the lower side when the double tube portion 20 is arranged so as to extend in the horizontal direction, but similarly, the inner tube 22 and the outer tube 21 are connected by the linear body 23. Can be prevented.

  Since the linear body 23 is made of a heat insulating material, heat conduction is unlikely to occur through the linear body 23, and the heat of the inner tube 22 is external even when the temperature of the inner tube 22 is higher than that of the outer tube 21. It is difficult to radiate heat from the tube 21. Moreover, since the clearance 24 can be provided in any part of the circumferential direction of the pipe by the linear body 23, the warm air flows smoothly.

Further, the outer tube 21 of the double tube portion 20 forms an external channel 21a so that the warm air flowing in the external channel 21a does not flow outside. As long as the hot air can be circulated, there may be some gaps even if it is not completely sealed.
In the hot water supply system 1 of the present embodiment, the flow direction of hot water flowing through the inner flow path 22a and the flow direction of hot air flowing through the outer flow path 21a are the same, but these directions should be relatively opposite. You can also.

Further, the hot water supply system 1 is provided with warm air heating means 30.
As shown in FIG. 1, the hot air heating means 30 includes a piping unit 31, a control unit 32, and a hot air generating unit 36, and the hot air generated by the hot air generating unit 36 is supplied to the outer flow path 21a. The hot water in the inner flow path 22a can be kept warm or heated.

  The piping part 31 has an outward piping 31a and a return piping 31b. The forward pipe 31 a is a pipe that connects the hot air generating section 36 and one end 50 of the outer flow path 21 a of the double pipe section 20, and the return pipe 31 b is the outer flow path of the hot air generating section 36 and the double pipe section 20. This is a pipe connecting the other end 51 of 21a. The forward pipe 31a, the return pipe 31b, and the outer flow path 21a form a series of hot air paths.

The hot air generator 36 includes a fan 33, a heater 35, and a box member 34. The fan 33 and the heater 35 are disposed inside the box member 34. The box member 34 is connected to the forward piping 31a and the return piping 31b.
The air in the box member 34 can be heated by the heater 35, and the heated air is sent to the outgoing pipe 31a by the fan 33 to generate hot air. The temperature of this hot air is higher than the outside air temperature, and is substantially the same as or slightly higher than the temperature of hot water supplied from the water heater 11.

  The type of the fan 33 is not particularly limited, but a fan with a small air volume and a relatively high indentation pressure is desirable. For example, a turbo fan can be used. The fan 33 uses less energy because it circulates air than a pump or the like used in a conventional hot water circulation path.

  Then, the warm air generated in the warm air generating part 36 flows from the forward pipe 31a to the outer flow path 21a of the double pipe part 20, and further returns to the hot air generating part 36 from the return pipe 31b and circulates. . That is, the warm air circulation path 38 is formed by the outgoing pipe 31 a, the outer flow path 21 a, the return pipe 31 b, and the box member 34 of the hot air generation unit 36.

  Since the linear body 23 of the double pipe portion 20 is spirally wound around the inner pipe 22, the space of the outer flow path 21 a is secured at any position in the circumferential direction, and along the linear body 23. Thus, a spiral flow can be easily generated, and the temperature unevenness in the circumferential direction of the hot air hardly occurs, so that the hot water can be kept warm and heated almost uniformly.

  A temperature sensor 40 is provided on the return pipe 31 b of the pipe part 31. The position of the temperature sensor 40 is located in the vicinity of the front of the hot air generator 36, and the temperature of the hot air that has returned to the hot air generator 36 can be measured.

  When the temperature of the hot water in the inner flow path 22a of the double pipe portion 20 is low, the heat of the hot air is transferred to the hot water in the inner flow path 22a, and the temperature of the hot air is lowered. The temperature goes down. In addition, when the temperature of the hot water in the inner flow path 22a of the double pipe portion 20 is high, the heat of the hot air is small and the heat transfer to the hot water in the inner flow path 22a is small, and the temperature of the hot air does not decrease. 40 detection temperature becomes high.

When the temperature detected by the temperature sensor 40 is equal to or lower than a predetermined temperature, the control unit 32 operates the hot air generation unit 36 (fan 33 and heater 35) or adjusts the amount of heat generated by the heater 35 to be increased. . Further, when the temperature detected by the temperature sensor 40 is equal to or higher than a predetermined temperature, the hot air generator 36 (fan 33 and heater 35) is stopped or the amount of heat generated by the heater 35 is adjusted to be small.
Since the control of the hot air generating unit 36 is performed as described above, the hot air generating unit 36 operates when the temperature of the hot water is low, and the hot air heating means 30 causes the hot water in the inner flow path 22a to flow within a predetermined temperature range. Can be controlled.

Further, since the warm air generated by the warm air heating means 30 circulates, the difference between the amount of heat flowing out to the outgoing pipe 31a side of the warm air generating section 36 and the amount of heat returning to the return pipe 31b is mainly the inner flow path 22a. This is the amount of heat used to heat the hot water. Accordingly, the amount of heat supplied by the warm air generated by the heater 35 is substantially equal to the amount of heat used to heat the hot water in the inner flow path 22a, and the amount of heat is small.
In addition, the double pipe part 60 as shown in FIG. 5 can be used. The double pipe part 60 is provided with a heat insulating member 61 outside the outer pipe 21. The heat insulating member 61 can reduce the amount of heat that is not used for heating the hot water in the inner flow path 22a, and can further reduce energy loss.

When hot water is used using the hot water supply system 1, the currant 12 is opened. Then, water is introduced into the water heater 11 through the water supply pipe 15, the water is heated to generate hot water, and the hot water is discharged from the currant 12 through the hot water supply pipe 16. At this time, the hot water discharged first when the currant 12 is opened is the hot water in the inner flow path 22a, but this hot water is kept at a predetermined temperature by the hot air heating means 30, so it is cooled. Almost no hot water is discharged, and hot water of a predetermined temperature is discharged immediately. For this reason, it is not necessary to throw away water.
Thereafter, when the hot water is continuously discharged, the hot water generated in the water heater 11 is discharged from the currant 12 with almost no cooling.

  The operation / stop of the hot air heating means 30 may be performed in accordance with the use of the water heater 11, and even when the use of the water heater 11 is stopped, if the water heater 11 is used in the near future. In the case where it is predicted, the warm air heating means 30 can be operated.

  When the hot air heating means 30 is operated in accordance with the use of the water heater 11, when hot water is discharged from the currant 12, the hot air heating means 30 is stopped and the hot water from the currant 12 is stopped. Thus, the hot air heating means 30 may be controlled to operate when the hot water stops. Usually, when the state where the hot water is discharged continues, it is not necessary to keep the hot water in the inner flow path 22a, and by stopping the hot air heating means 30, energy loss can be further reduced.

Examples of operating the hot air heating means 30 even when the water heater 11 is stopped include the following.
The control part 32 can operate the warm air heating means 30 based on the estimated use start time input by the user. And if a user inputs use start scheduled time, the warm air heating means 30 will act | operate a fixed time before use start scheduled time. Then, the hot air heating means 30 heats and keeps the temperature of the hot water in the inner flow path 22a of the double pipe portion 20 so as to be a hot water having a predetermined temperature.

  The hot air heating means 30 operates even when the hot water heater 11 is stopped from a certain time before the scheduled use start time to the scheduled use start time. Therefore, at the time of the scheduled use start time, The temperature is hot water of a predetermined temperature. Therefore, when the user pours out hot water from the currant 12 at the scheduled use start time, the cooled hot water is hardly discharged, and the hot water having a predetermined temperature is discharged.

  Moreover, the warm air heating means 30 can be always operated. In this case, since the temperature of the hot water in the inner flow path 22a is always a hot water having a predetermined temperature, the hot water having a predetermined temperature can be discharged whenever the hot water is supplied.

  Furthermore, the hot air heating means 30 can be operated on a cold day to prevent freezing of the hot water supply pipe 16.

  When there are a plurality of places where the hot water supply pipe 16 is branched and the hot water such as the currant 12 can be discharged, all the hot water supply pipes 16 are used as the double pipe portions 20, and the hot water discharged from all the places is so-called immediate hot water. It can also be. Further, as in the hot water supply system 2 shown in FIG. 6, the hot water supply pipes 16 that reach a part of the currant 12 can be used as the double pipe portion 20, and the hot water at some places can be used as so-called immediate hot water. In this case, since the hot air heating means 30 can be provided only in the specific currant 12 that requires so-called immediate hot water, energy loss can be further reduced.

  In the hot water supply systems 1 and 2 described above, the linear body 23 is spirally wound around the outer periphery of the inner pipe 22 constituting the double pipe portion 20, but the present invention is not limited to this. For example, it is good also as a structure which provided the helical convex part in the outer periphery of the inner tube | pipe 22. As shown in FIG. Further, the double pipe portion 20 has a ring member 70 mounted on the outer periphery of the inner tube 22 as shown in FIG. 7A, or a projection 71 provided on the inner side of the outer tube 21. Also good. Even in such a configuration, the heat conduction between the outer tube 21 and the inner tube 22 can be minimized.

It is an operation principle figure showing the hot-water supply system of a 1st embodiment of the present invention. It is a cross-sectional perspective view of the double pipe part used for the hot-water supply system of FIG. It is sectional drawing of the surface perpendicular | vertical to the axial direction of the double pipe part used for the hot-water supply system of FIG. It is sectional drawing shown in the state which bent the double pipe part used for the hot-water supply system of FIG. It is sectional drawing of the surface perpendicular | vertical to the axial direction which showed the modification of the double pipe part. It is an operation | movement principle figure which shows the hot water supply system which has two or more currants. (A) is a perspective view which shows the modification of a double pipe part, (b) is sectional drawing which shows another modification.

Explanation of symbols

1, 2 Hot-water supply system 11 Hot-water supply 12 Karan (hot water section)
16 Hot water supply pipes 20 and 60 Double pipe part 21 Outer pipe 21a Outer flow path 22 Inner pipe 22a Inner flow path 23 Linear body (gap forming means)
36 Hot air generating part 38 Hot air circulation path 61 Heat insulation member 70 Ring member (gap formation means)
71 Protrusions (void forming means)

Claims (5)

  A hot water heater that generates hot water of a predetermined temperature, a hot water outlet that discharges the hot water, a hot water supply pipe that connects the hot water heater and the hot water outlet, and a hot air generator capable of generating hot air, The hot water supply pipe is provided with a double pipe portion having an inner pipe and an outer pipe, and an inner flow path through which the hot water flows is formed inside the inner pipe of the double pipe portion. An outer flow path is formed between the inner pipe and the inner pipe, and hot water generated in the hot air generation section is allowed to flow through the outer flow path to heat or keep the hot water in the inner flow path. A hot water supply system characterized by that.   The hot water supply system according to claim 1, wherein a hot air circulation path including an outer channel and a hot air generator is formed, and the hot air generated in the hot air generator is circulated.   The hot water supply system according to claim 1 or 2, wherein a gap forming means for forming a gap between the outer pipe and the inner pipe is provided outside the inner pipe of the double pipe portion.   4. The double pipe portion has a linear body between the outer pipe and the inner pipe, and the linear body is arranged to be spiral. Hot water supply system as described in.   The hot water supply system according to any one of claims 1 to 4, wherein a heat insulating member is provided outside the outer pipe of the double pipe portion.

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