JP2012032118A - Hot water supply pipe - Google Patents

Abstract

In a hot water supply pipe for sending hot water from a hot water supply device to a hot water use terminal, it is possible to suppress a decrease in hot water temperature due to heat radiation in the hot water supply pipe line, thereby quickly circulating hot water in the hot water supply pipe line. The running cost is reduced by reducing the frequency of immediate hot water circulation operation in the hot water system.
A hot water supply pipe (1) is provided with a hot water supply pipe (9) for supplying hot water, and a heat insulation pipe through which hot water is passed in close proximity to or in contact with the hot water supply pipe (9) for suppressing heat dissipation of the hot water passing through the hot water supply pipe (9). 10. Since heat exchange is performed from the hot water supply line 9 to the hot water in the heat insulation pipe 10, heat loss to the surrounding atmosphere in the hot water supply line 9 is reduced, and the heat insulation property of the hot water passing through the hot water supply line 9 is reduced. Can be increased. Therefore, even when hot water has not been used for a certain period of time, the temperature of the hot water remaining in the hot water supply pipe 9 is difficult to decrease, and as a result, the frequency of the immediate hot water circulation operation in the hot water supply system 50 using the hot water supply pipe 1 is reduced. Less.
[Selection] Figure 1

Description

  The present invention relates to a hot water supply pipe used in a water heater or the like.

  2. Description of the Related Art Conventionally, there are water heaters that have heat source devices such as a heat pump and a gas heater that boil water, and supply the heated water to a hot water use terminal such as a currant or a dishwasher through a hot water supply line. In such a water heater, when the hot water has not been used for a certain period of time, the temperature of the hot water staying in the hot water supply pipe decreases due to heat dissipation, so at the start of hot water use, low temperature hot water is output from the hot water use terminal. Sometimes. Therefore, at the start of hot water use, a return pipe that returns hot water from the vicinity of the hot water use terminal of the hot water supply line to the hot water supply device so that the heated hot water can be discharged immediately (this is called “immediate hot water”). There is an instant hot water system that maintains the hot water temperature in the hot water supply pipe by circulating the hot water boiled in the hot water supply pipe and the return pipe by a pump (see, for example, Patent Document 1).

JP 2009-24981 A

  However, in the instant hot water system as described above, when the hot water temperature in the hot water supply line becomes low, an immediate hot water circulation operation is performed by a pump. In addition to this immediate hot water circulation operation, heat dissipation in the hot water supply pipe line is performed. In order to compensate for the amount of heat lost due to the above, the water heater needs to raise the temperature of the return hot water, leading to an increase in running cost.

  The present invention has been made to solve the above problems, and in a hot water supply pipe that sends hot water from a water heater to a hot water use terminal, it is possible to suppress a decrease in hot water temperature due to heat dissipation in the hot water supply pipe line. Thus, an object is to reduce the running cost by suppressing the frequency of the hot water circulation operation in the hot water system that circulates the hot water in the hot water supply pipe.

  The hot water supply pipe of the present invention includes a hot water supply pipe for sending hot water and a heat insulation pipe line that is disposed close to or in contact with the hot water supply pipe and through which the hot water passes to suppress heat dissipation of the hot water passing through the hot water supply pipe line. It is characterized by that.

  In this hot water supply pipe, it is preferable that the hot water supply pipe and the heat insulation pipe have a double pipe structure, and the heat insulation pipe is arranged on the outside and the hot water supply pipe is arranged on the inside.

  In this hot water supply pipe, it is preferable that the heat insulation pipe line is arranged in a spiral shape on the outer periphery of the hot water supply pipe line.

  In this hot water supply pipe, the heat insulation pipe is constituted by a return pipe that branches from the downstream end of the hot water supply direction in the hot water supply direction and flows hot water in a direction opposite to the hot water supply direction. It is preferable to use it as a heat source for heat insulation.

  In this hot water supply pipe, it is preferable that a communication hole for passing hot water from the hot water supply pipe to the heat insulation pipe is provided near the downstream end of the hot water supply pipe.

  In this hot water supply pipe, the heat insulation pipe is constituted by a drain pipe through which hot water discharged from a hot water use terminal connected to a downstream end of the hot water supply pipe in the hot water feed direction passes in a direction opposite to the hot water feed direction, It is preferable to use waste water as a heat source for heat insulation.

  In this hot water supply pipe, it is preferable that the heat insulation pipe line has an opening for introducing hot water drained from the hot water use terminal on the upstream side thereof.

  According to the hot water supply pipe of the present invention, the heat insulation pipe line is arranged close to or in contact with the hot water supply pipe line so that heat is exchanged from the hot water supply pipe line to the hot water in the heat insulation pipe line. The heat loss to the surrounding atmosphere is reduced, and the heat insulation property of the hot water passing through the hot water supply pipe line can be improved. Therefore, even when hot water has not been used for a certain period of time, the temperature of the hot water staying in the hot water supply line is unlikely to drop, and as a result, the frequency of the instant hot water circulation operation in the instant hot water system is reduced and the running cost is reduced. Can be expected.

The lineblock diagram of the hot-water supply system provided with the hot-water supply pipe concerning a 1st embodiment of the present invention. (A) is a sectional side view showing the hot water supply pipe, and (b) is a sectional view taken along line XX of (a). (A) is the fragmentary sectional perspective view which showed the hot water use terminal side of the hot-water supply pipe, (b) is the sectional side view. The lineblock diagram of the hot-water supply system provided with the hot-water supply pipe concerning the modification of the above-mentioned embodiment. The sectional side view which showed the hot water use terminal side of the said hot-water supply pipe | tube. The block diagram of the hot-water supply system provided with the hot-water supply pipe | tube which concerns on the 2nd Embodiment of this invention. The sectional side view which showed the said hot-water supply pipe. The lineblock diagram of the hot-water supply system provided with the hot-water supply pipe concerning the modification of the above-mentioned embodiment. The sectional side view which showed the said hot-water supply pipe.

(First embodiment)
A hot water supply pipe according to a first embodiment of the present invention will be described with reference to FIGS. 1 to 3. FIG. 1 shows a configuration of a hot water supply system 50 using a hot water supply pipe 1 according to the present embodiment. The hot water supply system 50 includes a hot water heater 2 and a hot water supply pipe 1 that sends hot water heated by the hot water heater 2 to the hot water use terminal 3.

  The hot water heater 2 includes a hot water storage tank 4 that stores heated hot water, and a heat pump 5 that is a heat source device for boiling water in the hot water storage tank 4. The hot water storage tank 4 is connected to the water supply pipe 6 at the bottom, and stores the water supplied from the water supply pipe 6. The heat pump 5 has a built-in hot water supply pump, sucks and boiles the water at the bottom of the hot water storage tank 4 through the water supply pipe 7, and sends the heated hot water to the top of the hot water storage tank 4 through the hot water supply pipe 8. Hot water in the hot water storage tank 4 is supplied to the hot water use terminal 3 through the hot water supply pipe 1 by the supply water pressure of the water supply pipe 6. The hot water use terminal 3 is, for example, a currant attached to a sink or a dishwasher.

  The hot water supply pipe 1 has a hot water supply pipe 9 for sending hot water from the water heater 2 to the hot water use terminal 3 and a heat insulation pipe 10 for keeping hot water passing through the hot water supply pipe 9. The heat insulation pipe line 10 is arranged close to or in contact with the outer periphery of the hot water supply pipe line 9 so that hot water for suppressing the heat radiation of the hot water in the hot water supply pipe line 9 passes therethrough. The hot water supply pipe 9 has an upstream end in the hot water feed direction connected to the top of the hot water storage tank 4 of the water heater 2, and a downstream end connected to the hot water outlet of the hot water use terminal 3. The heat insulation pipe 10 is provided as a return pipe for circulating hot water from the vicinity of the hot water use terminal 3 of the hot water supply pipe 9 to the hot water heater 2, and the return hot water from the hot water supply pipe 9 is used as a heat source for heat insulation. It is supposed to be. The heat insulation pipe 10 is branched from the downstream end of the hot water supply pipe 9 in the hot water feeding direction, and the hot water flows in the direction opposite to the hot water feeding direction. One end portion of the heat insulation pipe line 10 opposite to the hot water use terminal 3 is connected to the middle layer portion of the hot water storage tank 4 through the pipe 11. The pipe 11 is provided with a circulation pump 12 for circulating hot water for instant hot water and an on-off valve 13, and the circulation pump 12 and the on-off valve 13 are controlled by a control unit 14 provided in the hot water supply system 50. The control unit 14 detects the temperature of the hot water in the hot water supply pipe 9 using a temperature sensor. When the detected temperature falls below a threshold value, the control unit 14 opens the on-off valve 13 and drives the circulation pump 12 to supply hot water. The hot water circulation operation is performed in which the hot water in the hot water storage tank 4 is circulated through the pipe line 9, the heat insulation pipe line 10 and the pipe 11. The pipe 11 is provided with a check valve 15 for preventing hot water from flowing in the direction opposite to the direction of hot water circulation by the circulation pump 12.

  Next, the piping structure of the hot water supply pipe 1 will be described in detail. As shown in FIG. 2, the hot water supply pipe 1 has a double pipe structure in which a hot water supply pipe 9 and a heat insulation pipe 10 are combined, and the heat insulation pipe 10 is arranged on the outer side and the hot water supply pipe 9 is arranged on the inner side. . The outer periphery of the heat insulation pipe line 10 is covered with a pipe heat insulating material 16. The pipe heat insulating material 16 is formed using, for example, rock wool or urethane foam. With such a configuration, the heat retaining property of the hot water supply pipe 9 is increased by the heat of the hot water flowing through the heat retaining pipe 10, so that the hot water temperature in the hot water supply pipe 9 is unlikely to decrease. The hot water supply pipe line 9 and the heat insulation pipe line 10 may be arranged without being in contact with each other, or the hot water supply pipe line 9 may be inscribed in the heat insulation pipe line 10.

  As shown in FIG. 3, the downstream end of the hot water supply pipe 9 is connected to the hot water use terminal 3 through the heat insulation pipe 10 and the pipe heat insulating material 16. Near the downstream end of the hot water supply pipe 9, a communication hole 17 through which hot water passes from the hot water supply pipe 9 to the heat insulation pipe 10 is provided. A plurality of communication holes 17 are formed over the entire circumference of the hot water supply pipe 9. As a result, during the hot water circulation operation by the circulation pump 12, hot water in the hot water supply line 9 flows smoothly through the communication hole 17 and into the heat retaining line 10.

  The flow of hot water in the hot water supply system 50 including the hot water supply pipe 1 as described above will be described. The control unit 14 detects the hot water temperature in the hot water supply pipe 9 in real time, and when the detected temperature falls below the set temperature, opens the on-off valve 13 and drives the circulation pump 12. When the circulation pump 12 is driven, the hot water in the hot water storage tank 4 is circulated through a circulation path composed of the hot water supply line 9, the heat insulation pipe line 10 and the pipe 11, thereby staying in the hot water supply line 9 and the heat insulation line 10. The low temperature hot water that has been used is replaced with the high temperature hot water from the hot water storage tank 4. The control unit 14 closes the on-off valve 13 and stops driving the circulation pump 12 when a predetermined time has elapsed since the instant hot water circulation operation by the circulation pump 12 was started. The execution time of the hot water circulation operation is calculated in advance based on the length of the circulation path. Here, when the hot water outlet of the hot water use terminal 3 is opened, hot water in the hot water storage tank 4 is supplied from the hot water outlet through the hot water supply pipe 9.

  As described above, according to the hot water supply pipe 1 according to the present embodiment, the heat retaining pipe line 10 is disposed close to or in contact with the hot water supply pipe line 9, and heat exchange is performed from the hot water supply pipe line 9 to the hot water in the heat retaining pipe line 10. Since it was performed, the heat loss to the surrounding atmosphere in the hot water supply line 9 is reduced, and the heat retaining property of the hot water passing through the hot water supply line 9 can be improved. Therefore, even when hot water has not been used for a certain period of time, the temperature of the hot water remaining in the hot water supply pipe 9 becomes difficult to decrease, and as a result, the frequency of the immediate hot water circulation operation in the hot water supply system 50 is reduced, and the running cost is reduced. Reduction can be expected.

  Moreover, since the hot water supply pipe line 9 and the heat insulation pipe line 10 have a double pipe structure, the degree of freedom in piping design in the hot water supply system 50 is increased, and the construction space for the hot water heater 2 and the hot water use terminal 3 is narrow. Even if it is a case, it becomes possible to attach the hot water supply pipe line 9 and the heat insulation pipe line 10 easily. Further, since the return hot water from the hot water supply pipe 9 is passed through the heat insulation pipe 10 and used as a heat source for heat insulation, there is no need to separately provide a hot water supply system to the heat insulation pipe 10, which is economical. is there.

  Next, a modified example of the hot water supply pipe according to the embodiment will be described with reference to FIGS. 4 and 5. In the hot water supply pipe 1 of this modification, the heat insulation pipe line 10 is provided as a drain pipe for passing hot water discharged from the hot water use terminal 3 in a direction opposite to the hot water feed direction, and uses the waste water as a heat source for heat insulation. It has become a thing. Drainage from the hot water use terminal 3 is at a higher temperature than the ambient atmosphere of the hot water supply pipe 1 although the temperature is slightly lowered due to heat radiation. The heat insulation pipe line 10 is connected to the drain port of the hot water use terminal 3 and the pipe 10a on the upstream side thereof, and the waste water sent through the pipe 10a is introduced from the opening 10b. The hot water introduced into the heat insulation pipe line 10 is discharged from the pipe 10c on the opposite side to the hot water use terminal of the heat insulation pipe line 10. The hot water supply line 9 branches to a return pipe 18 connected to the hot water storage tank 4 on the downstream side in the hot water feeding direction from the heat retaining pipe 10. The return pipe 18 includes a circulation pump 12, an on-off valve 13, and a check. A valve 15 is provided.

  The flow of hot water in the hot water supply system 50 including the hot water supply pipe 1 as described above will be described. When the control unit 14 performs the hot water circulation operation by the circulation pump 12, the hot water in the hot water storage tank 4 is circulated through the circulation path including the hot water supply line 9 and the return pipe 18, and thereby stays in the hot water supply line 9. The low temperature hot water that has been used is replaced with the high temperature hot water from the hot water storage tank 4. When the outlet of the hot water use terminal 3 is opened, the hot water discharged from the hot water outlet flows into the heat insulation conduit 10 from the drain outlet of the hot water use terminal 3, and the heat of the hot water in the heat insulation conduit 10 The heat retaining property of the hot water supply line 9 is increased.

  In such a hot water supply pipe 1 as well, the same effect as described above can be obtained. Moreover, since the hot water discharged | emitted from the hot water use terminal 3 is passed through the heat insulation pipe line 10 and used as a heat source for heat insulation, it is economical.

(Second Embodiment)
A hot water supply pipe according to a second embodiment of the present invention will be described with reference to FIGS. The hot water supply pipe 1 according to the present embodiment is different from the first embodiment in that the heat retaining pipe line 10 is spirally arranged on the outer periphery of the hot water supply pipe line 9. The heat insulation pipe 10 is provided as a return pipe for immediate hot water circulation, and the return hot water from the hot water supply pipe 9 is introduced through the communication hole 17 so that the hot water flows in the direction opposite to the hot water feed direction. .

  In such a hot water supply pipe 1 as well, the same effect as described above can be obtained. Here, it is preferable that the heat insulation pipe line 10 is disposed in contact with the hot water supply pipe line 9, but even if there is a gap between the heat insulation pipe line 10 and the hot water supply pipe line 9, the heat of the hot water in the heat insulation pipe line 10. Thus, since the space around the hot water supply pipe line 9 covered with the pipe heat insulating material 16 is warmed, a temporary effect of keeping the hot water supply pipe line 9 warm can be obtained.

  Next, a modified example of the hot water supply pipe according to the embodiment will be described with reference to FIGS. 8 and 9. In the hot water supply pipe 1 of this modification, the heat insulation pipe line 10 is provided as a drain pipe through which hot water discharged from the hot water use terminal 3 is passed, and has pipes 10a and 10c at its upstream end and downstream end. This heat insulation pipe line 10 introduces the drainage of the hot water use terminal 3 from the opening 10b and uses it as a heat source for heat insulation. In such a hot water supply pipe 1 as well, the same effect as described above can be obtained.

  In addition, this invention is not restricted to the structure of the said various embodiment, A various deformation | transformation is possible in the range which does not change the meaning of invention. For example, the water heater 2 is not limited to the heat pump type water heater, and may be a gas water heater, an electric water heater, a hot water heater using solar heat, or the like.

DESCRIPTION OF SYMBOLS 1 Hot water supply pipe 3 Hot water use terminal 9 Hot water supply pipe 10 Thermal insulation pipe 10a Opening 17 Communication hole

Claims (7)

  A hot water supply comprising: a hot water supply pipe for sending hot water; and a heat insulation pipe that is disposed close to or in contact with the hot water supply pipe and through which the hot water passes to suppress heat dissipation of the hot water passing through the hot water supply pipe tube.   The hot water supply pipe according to claim 1, wherein the hot water supply pipe and the heat insulation pipe have a double-pipe structure, and a heat insulation pipe is arranged outside and a hot water supply pipe is arranged inside.   The hot water supply pipe according to claim 1, wherein the heat insulation pipe line is arranged in a spiral shape on an outer periphery of the hot water supply pipe line.   The heat insulation pipe is constituted by a return pipe branched from the downstream end of the hot water supply direction of the hot water supply pipe and flowing hot water in a direction opposite to the hot water supply direction, and the return hot water from the hot water supply pipe is used as a heat source for heat insulation. The hot water supply pipe according to claim 2 or 3, wherein the hot water supply pipe is provided.   The hot water supply pipe according to claim 4, wherein a communication hole for passing hot water from the hot water supply pipe to the heat insulation pipe is provided near the downstream end of the hot water supply pipe.   The heat insulation pipe is constituted by a drain pipe through which hot water discharged from a hot water use terminal connected to a downstream end of the hot water supply pipe in the hot water feed direction passes in a direction opposite to the hot water feed direction, and the drainage is used as a heat source for heat insulation. The hot water supply pipe according to claim 2 or claim 3, wherein   The hot water supply pipe according to claim 6, wherein the heat insulation pipe line has an opening for introducing hot water drained from the hot water use terminal on an upstream side thereof.

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