JP2007232251A - Hot water supply system - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a hot water supply system which prevents hot water remaining in hot water supply piping from coming out in a state where its temperature is lowered, when opening a hot water tap by simple constitution and control without additionally mounting a heating element near the hot water tap. <P>SOLUTION: The hot water supply system 10 includes: a heater 12 for producing hot water by heating the water supplied from water supply piping 11; the hot water taps 13a, 13b for releasing the produced hot water; and hot water supply pipes 14a, 14b communicating the heater 12 and the hot water taps 13a, 13b. The system 10 further comprises: return pipes 15a, 15b for returning the hot water in the hot water supply pipes 14a, 14b to the heater 12; and a circulation control device 16 for circulating the hot water to a circulation flow channel from the hot water supply pipes 14a, 14b to the heater 12 through the return pipes 15a, 15b. The hot water is circulated in the circulation flow channel until the hot water supply pipes 14a, 14b are filled with the heated hot water before the hot water taps 13a, 13b are opened, so that the heated hot water is released from the hot water taps 13a, 13b. <P>COPYRIGHT: (C)2007,JPO&INPIT

Description

  The present invention relates to a hot water supply system, and in particular, a heater that heats water supplied from a water supply pipe to a desired temperature to generate hot water, a hot water tap that discharges the generated hot water, a heater and a hot water tap, The present invention relates to a hot water supply system including a hot water supply pipe that communicates with each other.

  As a hot water supply system in which warmed hot water can be directly discharged from a hot-water tap, generally, a heater that heats water supplied from a water supply pipe to a desired temperature to generate hot water, and discharges the generated hot water. There is known a hot water supply system including a hot water tap and a hot water supply pipe communicating with the heater and the hot water tap.

  In such a hot water supply system, for example, if a considerable time elapses after the hot water system is operated and hot water is used, and the hot water is used again, the temperature of hot water remaining in the hot water supply pipe after the previous use decreases. When the hot water tap is opened, cold hot water lower than the desired temperature is released, so the user waits for warm hot water to be released from the hot water tap and uses the hot water.

Such cold and cold hot water is discarded without being used and is wasted, and when cold hot water is released when the hot-water tap is opened, the user is uncomfortable. Therefore, a technique has also been developed that can prevent the hot water remaining in the hot water supply pipe from coming out cold when the hot water supply port (hot water tap) is opened (see, for example, Patent Document 1).
JP-A-5-172353

  The hot water supply system described in Patent Document 1 is provided with an immediate hot water supply device having a heating body in addition to a hot water supply heat source such as a heater, and the system is complicated by requiring two heat sources. In addition, the control of the system by the control device becomes complicated.

  The present invention has been made paying attention to such a conventional problem, and it remains in the hot water supply pipe when the hot water tap is opened by a simple configuration and control without separately providing a heating body in the vicinity of the hot water tap. It is an object of the present invention to provide a hot water supply system capable of avoiding that hot water comes out while the temperature is lowered.

  The present invention includes a heater that generates hot water by heating water supplied from a water supply pipe, a hot water tap that discharges the generated hot water, and a hot water supply pipe that communicates the heater and the hot water tap. In the hot water supply system, a return pipe that returns the hot water in the hot water supply pipe to the heater, and a circulation control device that circulates the hot water in a circulation path from the hot water supply pipe to the heater through the return pipe, Prior to opening the hot water tap, hot water can be circulated through the circulation channel until the hot water is filled in the hot water supply pipe, and then the heated hot water can be discharged from the hot water tap. The above object is achieved by providing a hot water supply system as described above.

  In the hot water supply system of the present invention, a first temperature sensor is provided immediately upstream of the hot water tap in the circulation flow path, and a signal is generated when the first temperature sensor detects the heated hot water. It is preferable to do.

  Furthermore, in the hot water supply system of the present invention, the circulation control device includes a first electromagnetic valve provided in the hot water supply pipe, a second electromagnetic valve provided in the return pipe, and a third electromagnetic valve provided in the water supply pipe. It is preferable to have a function of controlling the opening and closing of the valve.

  Furthermore, in the hot water supply system according to the present invention, it is preferable that a second temperature sensor is provided on the downstream side across the heater, and a third temperature sensor is provided on the upstream side across the heater.

  According to the hot water supply system of the present invention, the hot water remaining in the hot water supply pipe comes out at a low temperature when the hot water tap is opened by a simple configuration and control without separately providing a heating element in the vicinity of the hot water tap. Can be avoided.

  A hot water supply system 10 according to a preferred embodiment of the present invention, for example, as shown in FIG. 1, heats water supplied from a water supply pipe 11 to generate hot water, and discharges the generated hot water. In a hot water supply system including hot water supply taps 13a and 13b and hot water supply pipes 14a and 14b communicating with the heater 12 and the hot water supply taps 13a and 13b, the hot water supply system 10 is operated, and the heater 12 supplies hot water at a predetermined temperature. When the hot water supply system 10 is once stopped and the operation of the hot water supply system 10 is stopped and the hot water supply system 10 is operated again after a considerable amount of time has passed, the hot water supply pipes 14a and 14b are used after the previous use. This is employed in order to effectively avoid the remaining cold hot water having a lowered temperature from the open hot water taps 13a and 13b.

  That is, the hot water supply system 10 of the present embodiment includes a heater 12 that heats the water supplied from the water supply pipe 11 to generate hot water, hot water taps 13 a and 13 b that discharge the generated hot water, and a heater 12. In a hot water supply system including hot water supply pipes 14a and 14b communicating with the hot water taps 13a and 13b, return pipes 15a and 15b for returning hot water in the hot water supply pipes 14a and 14b to the heater 12 as shown in FIG. A circulation control device 16 that circulates hot water in a circulation passage extending from the hot water supply pipes 14a, 14b to the heater 12 via the return pipes 15a, 15b, and before the hot water supply taps 13a, 13b are opened. The hot water is circulated through the circulation channel until the hot water is filled in the pipes 14a and 14b, and then the heated hot water can be discharged from the hot water taps 13a and 13b. You have me.

  Further, the hot water supply system 10 of the present embodiment is provided with first temperature sensors 17a and 17b immediately before the hot water taps 13a and 13b in the circulation flow path, and the first temperature sensors 17a and 17b detect the heated hot water. In this case, for example, a signal is emitted by the pilot lamps 18a and 18b.

  In the present embodiment, the water supply pipe 11, the heater 12, the hot water taps 13a and 13b, the hot water supply pipes 14a and 14b, and the like can be the same as those used in the conventional hot water supply system. Various heaters having a function of generating hot water by heating water by gas combustion or an electric heater, which are known as heat exchangers, water heaters, etc., can be adopted as the heater 12.

  In this embodiment, in addition to the configuration of the conventional hot water supply system, return pipes 15a and 15b for returning hot water in the hot water supply pipes 14a and 14b to the heater 12 are provided, and the return pipes 15a and 15b are provided. By interposing, a circulation flow path from the hot water supply pipes 14a, 14b to the heater 12 through the return pipes 15a, 15b is formed. In this embodiment, in FIG. 2, the hot water taps 13a and 13b are provided at two locations, and for example, a circulation flow path driven by the circulation pump 20 forms two flow paths corresponding to each of the hot water taps 13a and 13b. However, the hot-water tap and the circulation channel can be provided at one place (one channel) or at three places (three channels) or more.

  In the present embodiment, the hot water supply pipes 14 a and 14 b that connect the heater 12 and the two hot water taps 13 a and 13 b are branched from the hot water supply main pipe 14 in a portion immediately after the downstream side of the heater 12. The first solenoid valves 19a and 19b are respectively provided at the base end portions of the branch portions. Further, the hot water supply main pipe 14 on the upstream side of the branched hot water supply pipes 14 a and 14 b is provided immediately after the downstream side of the heater 12, and a second temperature sensor 24 is provided.

  The return pipes 15a and 15b for returning the hot water in the hot water supply pipes 14a and 14b to the heater 12 are branched from the hot water supply pipes 14a and 14b in the portion immediately upstream of the hot water taps 13a and 13b. First temperature sensors 17a and 17b are provided at the dividing portion. The return pipes 15a and 15b are joined at their downstream ends to form the return main pipe 15, and a circulation pump 20 is provided at the junction. The return main pipe 15 further merges with the water supply pipe 11 at the downstream end thereof, and the hot water in the hot water supply pipes 14a and 14b sent from the return pipes 15a and 15b passes through the water supply pipe 11 on the downstream side of the junction. And can be returned to the heater 12.

  The return main pipe 15 on the downstream side of the junction of the branched return pipes 15 a and 15 b is provided with a second electromagnetic valve 21 and a check valve 23, and the return main pipe 15 of the water supply pipe 11 is connected to the return main pipe 15. A third electromagnetic valve 22 and a check valve 23 are provided in a portion immediately upstream from the junction. Furthermore, in the portion between the water supply pipe 11 and the heater 12 on the downstream side of the junction with the return main pipe 15, the third temperature sensor 25 and the third temperature sensor 25 are located on the upstream side of the heater 12. A storage tank 26 is provided.

  In the present embodiment, the first electromagnetic valves 19a and 19b provided in the hot water supply pipes 14a and 14b, the second electromagnetic valve 21 provided in the return pipes 15a and 15b (return main pipe 15), and the water supply pipe 11 are provided. In addition to the third solenoid valve 22, the pilot lamps 18a and 18b, the circulation pump 20, the first temperature sensors 17a and 17b, the second temperature sensor 24, the third temperature sensor 25, and the like are controlled by the circulation control device 16, for example. When discharging hot water heated to a desired temperature from the hot-water tap 13a, the hot-water supply system 10 operates as follows.

  That is, for example, by turning on an operation switch provided close to the pilot lamp 18a, an instruction is given to the circulation control device 16, and the first electromagnetic valve 19a provided in the hot water supply pipe 14a is opened, The third solenoid valve 22 provided in the water supply pipe 11 is closed, and the circulation pump 20 is operated, so that hot water flows through the circulation path from the hot water supply pipe 14a to the heater 12 through the return pipe 15a. At the same time, the heater 12 is ignited, hot water returned from the return pipe 15a is heated, and hot water generated thereby is supplied to the hot water supply pipe 14a so as to replace the hot water remaining in the hot water supply pipe 14a. . When the supplied heated hot water reaches the portion of the hot water supply pipe 14a where the first temperature sensor 17a is provided, the first temperature sensor 17a detects the heated hot water and turns on the pilot lamp 18a to turn on the hot water supply pipe. A signal notifying that heated hot water is filled in 14a is issued. At the same time, the second electromagnetic valve 21 provided in the return pipe 15a is closed, the operation of the circulation pump 20 is stopped, and the third electromagnetic valve 22 provided in the water supply pipe 11 is opened.

  From such a state, when the user opens the hot-water tap 13a, heated hot water at a desired temperature is released immediately after the opening, and the water supplied from the water supply pipe 11 is heated by the heater 12. As in the conventional hot water supply system, the hot water can be continuously discharged. Further, when discharging hot water heated to a desired temperature from another hot water tap 13b, the hot water system 10 is operated in the same manner and heated to the desired temperature immediately after the user opens the hot water tap 13b. It becomes possible to discharge the hot water.

  Therefore, according to the hot water supply system 10 of the present embodiment, without providing a separate heating body other than the heater 12 in the vicinity of the hot water taps 13a, 13b, with the simple configuration and control, when the hot water taps 13a, 13b are opened, It is possible to easily avoid the hot water remaining in the hot water supply pipes 14a and 14b from coming out with the temperature lowered.

  Further, in the present embodiment, the hot water remaining in the hot water supply pipes 14a and 14b can be used without waste as hot water at a desired temperature without being discarded, and an environment-friendly system can be formed. Become.

  The present invention is not limited to the above-described embodiment, and various modifications can be made. For example, it is not always necessary to notify the timing of opening by detecting hot water at a predetermined temperature by a first temperature sensor provided immediately upstream of the hot water tap, and the amount of water in the hot water supply pipe calculated in advance is not necessarily required. Accordingly, the hot water tap can be controlled to be opened after a certain amount of hot water is sent out from the heater. Moreover, according to the amount of water in each hot water supply pipe | tube with different length, fixed_quantity | quantitative_assay of the hot water to supply can also be preset for every different hot-water tap. Furthermore, it is possible to provide a function that can appropriately remove the hot water returned to the heater via the return pipe, and a certain amount of hot water can pass through the return pipe even when the hot-water tap remains open. Until it is returned, a function for controlling so that hot water is not discharged from the hot water tap can be provided.

BRIEF DESCRIPTION OF THE DRAWINGS It is a schematic perspective view explaining the structure and function of the hot water supply system which concerns on preferable one Embodiment of this invention. 1 is a system configuration diagram illustrating a configuration of a hot water supply system according to a preferred embodiment of the present invention.

Explanation of symbols

DESCRIPTION OF SYMBOLS 10 Hot water supply system 11 Hot water supply pipe 12 Heater 13a, 13b Hot water tap 14 Hot water supply main pipe 14a, 14b Hot water supply pipe 15 Return main pipe 15a, 15b Return pipe 16 Circulation control device 17a, 17b 1st temperature sensor 18a, 18b Pilot lamp 19a, 19b 1st solenoid valve 20 Circulation pump 21 2nd solenoid valve 22 3rd solenoid valve 23 Check valve 24 2nd temperature sensor 25 3rd 3rd temperature sensor 26 Storage tank

Claims (4)

In a hot water supply system including a heater that heats water supplied from a water supply pipe to generate hot water, a hot water tap that discharges the generated hot water, and a hot water supply pipe that communicates the heater and the hot water tap.
A return pipe for returning hot water in the hot water supply pipe to the heater, and a circulation control device for circulating hot water in a circulation flow path from the hot water supply pipe to the heater via the return pipe,
Prior to opening the hot water tap, hot water can be circulated through the circulation channel until the hot water is filled in the hot water supply pipe, and then the heated hot water can be discharged from the hot water tap. A hot water supply system.   The hot water supply system according to claim 1, wherein a first temperature sensor is provided immediately upstream of the hot water tap in the circulation channel, and a signal is generated when the first temperature sensor detects the heated hot water. .   The circulation control device has a function of opening and closing a first electromagnetic valve provided in the hot water supply pipe, a second electromagnetic valve provided in the return pipe, and a third electromagnetic valve provided in the water supply pipe. Item 3. A hot water supply system according to item 1 or 2. , The hot-water supply system in any one of Claims 1-3 which provided the 2nd temperature sensor in the downstream which pinched | interposed the said heater, and provided the 3rd temperature sensor in the upstream which pinched | interposed the said heater.

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