JP2015031456A - Hot water supply device - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a hot water supply device capable of shortening a time from when cut-off means is opened until proper temperature water is discharged, while suppressing a water discharge amount.SOLUTION: A hot water supply device includes: a mixture unit that mixes high temperature water and low temperature water to tap hot water; a hot water supply pipe that supplies the high temperature water to the mixture unit; a branch pipe that is branched from the hot water supply pipe; a water discharge unit that is provided to the branch pipe, and switches discharge water and non-discharge water; a temperature measurement unit that measures water temperature in the hot water supply pipe; and a control unit that performs switching control of the water discharge unit according to the measurement result of the temperature measurement unit.

Description

  The present invention relates to a hot water supply apparatus.

  2. Description of the Related Art Conventionally, there is known a hot water supply apparatus that can shorten the time from when a hot water tap (water stop cock) is opened to when appropriate temperature water is discharged.

  For example, Patent Document 1 discloses a hot water supply apparatus including an immediate water heater that is disposed in the middle of a hot water supply pipe that connects a hot water heater and a hot water tap. In this hot water supply device, when the hot water tap is closed, the hot water between the hot water heater and the hot water tap is periodically drained, and the hot water heated by the quick water heater is immediately separated from the hot water heater and the hot water tap. Supplied during. As a result, the hot water tap is opened to prevent cold water from being discharged.

  Further, for example, in Patent Document 2, in a water heater provided with a water heater, a hot water supply pipe, and a hot water tap, a drain valve is connected to a pipe branched from the vicinity of the outlet of the hot water supply pipe, and an electric mixing valve is provided near the inlet of the hot water supply pipe. A hot water supply apparatus having a temperature sensor in a hot water supply pipe is disclosed. In this hot water supply apparatus, warm water is intermittently supplied to the hot water supply pipe to warm the hot water supply pipe based on the setting of the heat retention time of the hot water supply pipe. Thereby, when a hot-water tap is opened, hot water of a desired temperature is discharged in a short time.

JP 2005-61788 A Japanese Patent Laid-Open No. 7-4745

  However, in the hot water supply device of Patent Document 1, since hot water between the immediate water heater and the hot water tap is periodically drained, when a certain time elapses, the hot water between the immediate water heater and the hot water tap is changed. Even if the temperature is still high, it is drained.

  Moreover, in the hot water supply apparatus of the above-mentioned patent document 2, since the drain valve is provided on the downstream side of the electric mixing valve, low temperature water for adjusting the water temperature by the electric mixing valve (for mixing with high temperature water from the water heater). Water) will also be drained. In addition, when the set temperature of hot water to be supplied intermittently is low, the ratio of mixing high-temperature water from the water heater by the electric mixing valve is small, so the amount of hot water discharged from the water heater decreases, and the water heater does not operate. There is a case. Therefore, there is a possibility that the hot water supply pipe cannot be heated.

  In view of the above problems, an object of the present invention is to provide a hot water supply apparatus that can shorten the time from opening a water stop means to discharging appropriate temperature water while suppressing the amount of drainage.

In order to achieve the above object, the hot water supply apparatus of the present invention comprises a mixing section for mixing hot water and low temperature water to discharge hot water,
A hot water supply pipe for supplying hot water to the mixing section;
A branch pipe branched from the hot water supply pipe;
A drainage section provided in the branch pipe for switching between drainage and non-drainage;
A temperature measuring unit for measuring the temperature of water in the hot water supply pipe;
And a control unit that performs switching control of the drainage unit according to the measurement result by the temperature measurement unit (first configuration).

  According to such a structure, if the temperature of the water in a hot water supply pipe | tube becomes low in the state which closed the water stop means, a drainage part will drain the water in a hot water supply pipe | tube by control of a control part. Thereby, high temperature water is supplied to hot water supply piping. Accordingly, hot water is always supplied to the hot water supply pipe, and when the water stop means is opened, the hot water generated by the mixing unit is discharged in a short time.

  In addition, when the water in the hot water supply pipe is still at a high temperature, the drainage unit does not drain under the control of the control unit, so that it is not wastefully drained. Furthermore, since the water in the hot water supply pipe arranged upstream from the mixing section is drained, the amount of drainage can be suppressed.

  The first configuration may further include a check valve provided in the hot water supply pipe, and the branch pipe may be branched upstream of the check valve (second configuration).

  According to such a configuration, since the backflow is suppressed by the check valve when drained by the drainage part, it is possible to prevent the low temperature water from being drained through the mixing part.

Further, in the first or second configuration, a second hot water supply pipe branched from the hot water supply pipe;
A second water supply pipe branched from the water supply pipe for supplying the low-temperature water;
It is good also as a structure further equipped with the 2nd mixing part which mixes the high temperature water supplied with the said 2nd hot water supply piping, and the low temperature water supplied with the said 2nd water supply piping, and discharges hot water ( Third configuration).

  According to such a configuration, when the temperature of the water in the hot water supply pipe decreases, the drain valve drains the water in the second hot water supply pipe under the control of the control unit. Thereby, high temperature water is supplied to the second hot water supply pipe. Therefore, the hot water is always supplied to the second hot water supply pipe, and when the second water stop means is opened, the appropriate temperature hot water generated by the second mixing section is discharged in a short time. Therefore, in each of the plurality of hot water supply systems, the appropriate temperature water is discharged in a short time when each water stop means is opened.

  In any one of the first to third configurations, the drainage unit may be configured by an electromagnetic valve (fourth configuration).

  According to such a configuration, since the solenoid valve is in a closed state at the time of a power failure, it is possible to suppress the drainage from being continued.

  According to the hot water supply apparatus of the present invention, it is possible to shorten the time from when the water stop means is opened until the appropriate temperature water is discharged while suppressing the amount of drainage.

It is a figure which shows the structure of the hot water supply apparatus which concerns on 1st Embodiment of this invention. It is a figure which shows the structure of the hot water supply apparatus which concerns on 2nd Embodiment of this invention.

  An embodiment of the present invention will be described below with reference to the drawings.

<First Embodiment>
The structure of the hot water supply apparatus according to the first embodiment of the present invention is shown in FIG. A hot water supply apparatus 100 according to the first embodiment of the present invention shown in FIG. 1 includes a hot water supply pipe 2, an electronic control mixing unit 3, a water supply pipe 4, a stop cock 5, an external hot water supply pipe 6, a branch part 7, a drain valve 8, A pressure reducing valve 9, a temperature sensor 10, a check valve 11, a pressure reducing valve 12, a check valve 13, a control unit 14, and a branch pipe 15 are provided. In addition, although the hot water supply apparatus 10 can take various forms, as an example, it is provided with a bathtub and supplies the hot water from the edge part of the external hot water supply piping 6 to the said bathtub.

  One end of the hot water supply pipe 2 is connected to the hot water supply pipe 17 at the wall W of the building facility, and the other end is connected to the hot water inlet 3A of the electronic control mixing unit 3. The hot water supply pipe 17 is arranged over a long distance, and the end of the hot water supply pipe 17 opposite to the wall W side is connected to the boiler 1. The boiler 1 heats the supplied low-temperature water to a predetermined temperature (for example, about 60 ° C.) and discharges the high-temperature water to the hot water supply pipe 17.

  In the middle of the hot water supply pipe 2, a pressure reducing valve 9, a temperature sensor 10, a branch part 7, and a check valve 11 are provided in order from the upstream side which is the wall W side. A drain valve 8 is provided in the middle of a branch pipe 15 that is branched from the hot water supply pipe 2 by the branch portion 7.

  The pressure reducing valve 9 is a valve that reduces the pressure of water to be supplied to a predetermined pressure. The temperature sensor 10 is a sensor that measures the temperature of water in the hot water supply pipe 2. The check valve 11 prevents the downstream water from flowing back to the upstream side (that is, from the electronic control mixing unit 3 side to the branching unit 7 side).

  The drain valve 8 is constituted by an electromagnetic valve, and its opening / closing is controlled by the control unit 14 in accordance with the measurement result of the temperature sensor 10.

  One end of the water supply pipe 4 is connected to a water supply pipe (not shown) at the wall W, and low temperature water is supplied from the water supply pipe to the water supply pipe 4. On the other hand, the other end of the water supply pipe 4 is connected to the water inlet 3 </ b> B of the electronic control mixing unit 3. In the middle of the water supply pipe 4, a pressure reducing valve 12 and a check valve 13 are provided in order from the upstream side.

  The pressure reducing valve 12 is a valve for reducing the pressure of water to be supplied to a predetermined pressure. The check valve 13 prevents the downstream water from flowing back to the upstream side (that is, from the electronic control mixing unit 3 side to the pressure reducing valve 12 side).

  The electronically controlled mixing unit 3 controls the mixing ratio between the hot water that enters from the inlet 3A and the low-temperature water that enters from the inlet 3B, and discharges the hot water generated by mixing from the outlet 3C.

  One end of the external hot water supply pipe 6 is connected to the hot water outlet 3C of the electronic control mixing unit 3, and hot water is supplied from the other end to the outside. In the middle of the external hot water supply pipe 6, a temperature sensor 16 and a stop cock 5 are provided in order from the upstream side.

  The temperature sensor 16 is a sensor that measures the temperature of hot water flowing through the external hot water supply pipe 6. The control unit 14 controls the electronic control mixing unit 3 so that the measurement result by the temperature sensor 16 becomes a predetermined set temperature (for example, about 40 °).

  The stop cock 5 can be opened and closed manually by the user. When the stop cock 5 is opened, hot water is supplied, and when it is closed, the hot water supply is stopped. The stop cock 5 may be automatically opened and closed.

  When the stop cock 5 is open, the high temperature water discharged from the boiler 1 and supplied through the hot water supply pipe 17 and the hot water supply pipe 2 and the low temperature water supplied through the water supply pipe 4 are electronically controlled mixing units. 3, hot water having a set temperature generated by mixing is supplied to the outside through the external hot water supply pipe 6 (that is, hot water is discharged from the end of the external hot water supply pipe 6).

  In addition, when the stop cock 5 is closed, the control unit 14 opens the drain valve 8 when the water temperature measured by the temperature sensor 10 is equal to or lower than a threshold temperature (for example, about 50 ° C.). The drain valve 8 is controlled to be closed.

  Thereby, when the stop cock 5 is closed, when the temperature of the high-temperature water stored in the hot water supply pipe 2 decreases and the water temperature falls below the threshold temperature, the drain valve 8 is opened, and the low-temperature water is discharged. It will be drained. At this time, the water downstream of the check valve 11 (on the electronic control mixing unit 3 side) does not flow back and is not drained. Thereby, it can suppress that the water supplied through the water supply piping 4 is drained through the electronic control mixing part 3 and the hot water supply piping 2.

  When such low temperature water is drained, the boiler 1 is activated by the generation of water flow, and high temperature water (for example, water of about 60 °) heated by the boiler 1 is supplied to the hot water supply pipe 2 via the hot water supply pipe 17. Is done. Thereby, when the measurement result by the temperature sensor 10 exceeds the threshold temperature, the drain valve 8 is closed by the control unit 14. Therefore, high temperature water is stored in the hot water supply pipe 2 (and the branch pipe 15). Thereafter, when the temperature of the water in the hot water supply pipe 2 is lowered again, the drain valve 8 is opened and drained, and new high-temperature water is supplied.

  In this way, hot water exceeding the threshold temperature is always stored in the hot water supply pipe 2 in the state where the stop cock 5 is closed. Therefore, if the stop cock 5 is opened in this state, high-temperature water stored in the hot water supply pipe 2 is supplied to the electronic control mixing unit 3, and hot water having a set temperature (for example, about 40 °) is externally supplied through the external hot water supply pipe 6. Hot water is supplied. That is, the appropriate temperature water is discharged from the end of the external hot water supply pipe 6 in a short time after the stop cock 5 is opened.

  Further, since the drainage is not performed unless the measurement result by the temperature sensor 10 is equal to or lower than the threshold temperature, it is possible to suppress the wasteful drainage of the water having a still high water temperature. Furthermore, since the water in the hot water supply pipe 2 disposed upstream of the electronic control mixing unit 3 is drained, the amount of drainage can be suppressed.

  Further, when the water having a low temperature in the hot water supply pipe 2 is drained, a sufficient flow of water is generated, so that the boiler 1 can be reliably operated. Therefore, the heated high temperature water can be reliably supplied to the hot water supply pipe 2.

  Moreover, since the drain valve 8 is constituted by a solenoid valve, the drain valve 8 is closed during a power failure, and therefore, drainage can be prevented from being continued.

Second Embodiment
Next, a second embodiment of the present invention will be described. The structure of the hot water supply device according to the second embodiment of the present invention is shown in FIG. In the present embodiment, an electronic control mixing unit is added to the first embodiment described above, and the temperature can be individually adjusted in a plurality of systems so that hot water can be supplied. In FIG. 2, the same reference numerals as those in FIG. 1 are assigned to the same configurations as those in the first embodiment.

  A hot water supply apparatus 200 according to the present embodiment shown in FIG. 2 includes a hot water supply pipe 18 provided with a branch part 19 between the branch part 7 and the check valve 11 in the hot water supply pipe 2 and having one end connected to the branch part 19. ing. That is, the hot water supply pipe 18 is a pipe branched from the hot water supply pipe 2.

  The other end of the hot water supply pipe 18 is connected to a hot water inlet 24 </ b> A of the electronic control mixing unit 24. A check valve 20 is provided in the middle of the hot water supply pipe 18.

  Further, a branch portion 22 is provided between the pressure reducing valve 12 and the check valve 13 in the water supply pipe 4, and one end portion of the water supply pipe 21 is connected to the branch portion 22. That is, the water supply pipe 21 is a pipe branched from the water supply pipe 4.

  The other end of the water supply pipe 21 is connected to a water inlet 24 </ b> B of the electronic control mixing unit 24. A check valve 23 is provided in the middle of the water supply pipe 21.

  One end of an external hot water supply pipe 26 is connected to the outlet 24C of the electronic control mixing unit 24. In the middle of the external hot water supply pipe 26, a temperature sensor 27 and a stop cock 25 are provided in order from the upstream side.

  The control unit 28 controls the electronic control mixing unit 24 so that the measurement result by the temperature sensor 27 becomes a predetermined set temperature. The set temperature may be the same as or different from the set temperature for temperature adjustment by the electronic control mixing unit 3.

  When the stop cock 26 is open, the hot water discharged from the boiler 1 and supplied through the hot water supply pipe 17, the hot water supply pipe 2, and the hot water supply pipe 18, and the water is supplied through the water supply pipe 4 and the water supply pipe 21. Low temperature water is mixed by the electronic control mixing unit 24, and hot water having a set temperature generated by the mixing is supplied to the outside through the external hot water supply pipe 26.

  Further, when the stop cock 5 and the stop cock 25 are closed, when the temperature of the hot water stored in the hot water supply pipe 2 decreases and the water temperature falls below the threshold temperature, the drain valve 8 opens and the hot water supply pipe is opened. 2 and the water stored in the hot water supply pipe 18 are drained. At this time, water on the downstream side (on the electronic control mixing unit 24 side) from the check valve 20 does not flow back and is not drained. Thereby, it can suppress that the water supplied through the water supply piping 21 is drained through the electronic control mixing part 24 and the hot water supply piping 18.

  When such low temperature water is drained, the boiler 1 is activated by the generation of water flow, and the high temperature water heated by the boiler 1 is supplied to the hot water supply pipe 2 via the hot water supply pipe 17. Thereby, when the measurement result by the temperature sensor 10 exceeds the threshold temperature, the drain valve 8 is closed by the control unit 14. Accordingly, the high temperature water is stored in the hot water supply pipe 2 and the hot water supply pipe 18 (and the branch pipe 15). Thereafter, when the temperature of the water in the hot water supply pipe 2 is lowered again, the drain valve 8 is opened and drained, and new high-temperature water is supplied.

  Thus, hot water is always stored in the hot water supply pipe 18 with the stop cock 5 and the stop cock 25 closed. Accordingly, if the stop cock 25 is opened in this state, the high-temperature water stored in the hot water supply pipe 18 is supplied to the electronic control mixing unit 24, and hot water at the set temperature is supplied to the outside through the external hot water supply pipe 26. That is, the appropriate temperature water is supplied in a short time after the stop cock 25 is opened. In addition, it is the same as that of 1st Embodiment that appropriate temperature water is supplied in a short time even if the water stop cock 5 is opened.

  As described above, according to the present embodiment, it is possible to shorten the time from when each stop cock in a plurality of hot water supply systems is opened until the appropriate temperature water is supplied.

  As a modification of the present embodiment, it is possible to provide three or more hot water supply systems.

  As mentioned above, although embodiment of this invention was described, if it is in the range of the meaning of this invention, embodiment may be variously deformed.

  For example, in the above embodiment, the temperature sensor 10 may be arranged in the branch pipe 15.

1 Boiler 2 Hot-water supply piping 3 Electronic control mixing unit (mixing unit)
4 Water supply piping 5 Water stop cock (water stop means)
6 External hot water supply piping 7 Branching section 8 Drain valve (drainage section)
9 Pressure reducing valve 10 Temperature sensor (temperature measuring part)
DESCRIPTION OF SYMBOLS 11 Check valve 12 Pressure reducing valve 13 Check valve 14 Control part 15 Branch pipe 16 Temperature sensor 17 Hot water supply pipe 18 Hot water supply pipe 19 Branch part 20 Check valve 21 Water supply pipe 22 Branch part 23 Check valve 24 Electronic control mixing part 25 Stop Water faucet (second water stop means)
26 External hot water supply piping 27 Temperature sensor 28 Control unit 100, 200 Hot water supply device

Claims (4)

A mixing section for mixing hot and cold water to discharge hot water;
A hot water supply pipe for supplying hot water to the mixing section;
A branch pipe branched from the hot water supply pipe;
A drainage section provided in the branch pipe for switching between drainage and non-drainage;
A temperature measuring unit for measuring the temperature of water in the hot water supply pipe;
A hot water supply apparatus comprising: a control unit that performs switching control of the drainage unit according to a measurement result by the temperature measurement unit. A check valve provided in the hot water supply pipe;
The hot water supply apparatus according to claim 1, wherein the branch pipe branches on the upstream side of the check valve. A second hot water supply pipe branched from the hot water supply pipe;
A second water supply pipe branched from the water supply pipe for supplying the low-temperature water;
The apparatus further comprises a high temperature water supplied to the second hot water supply pipe and a low temperature water supplied to the second hot water supply pipe to mix and discharge a hot water. The hot-water supply apparatus of Claim 1 or Claim 2.   The hot water supply apparatus according to any one of claims 1 to 3, wherein the drainage part is configured by an electromagnetic valve.

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