JP2017058058A - Instantaneous hot water supply system for bathroom faucet - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide an instantaneous hot water supply system capable of discharging hot water of set temperature at the beginning of discharging operation and capable of reducing an amount of useless water from water discharging operation starting time to the discharging of hot water of set temperature.SOLUTION: This invention relates to an instantaneous hot water system for a bathroom faucet installed at an upstream side of the bathroom faucet comprising a first flow passage extending from a water heater; heating means for heating water; a second flow passage for feeding heated water to its downstream side; a third flow passage merging with the second flow passage without passing by the heating means; a temperature adjustment mechanism arranged at the downstream sides of the second flow passage and the third flow passage to enable their temperatures to be adjusted; a fourth flow passage acting as a flow passage connecting the temperature adjustment mechanism with the bathroom faucet; residual water discharging means for preventing hot water from being left at the fourth flow passage after discharging from the bathroom faucet; and a control part for controlling heating means. The instantaneous hot water system for a bathroom faucet includes expanded water discharging means having an expanded water discharging flow passage for use in discharging expanded water generated through heating of water by the heating means and the expanded water discharging flow passage is arranged along the second flow passage.SELECTED DRAWING: Figure 1

Description

  The present invention relates to an instant hot water system for a bathroom faucet capable of instantaneously heating supplied water and discharging hot water from the initial stage of water discharge.

  2. Description of the Related Art Conventionally, an instant hot water system for a bathroom faucet using an instant hot water system in which heating means is provided on the upstream side of a bathroom faucet in order to enable hot water to be discharged from the early stage of water discharge has been widely used.

  Patent Documents 1 and 2 below propose an instant hot water system for a bathroom faucet that can discharge hot water from the initial stage of water discharge.

  The hot water supply apparatus described in Patent Document 1 below can be provided with a drainage unit between the mixing tap and the shower device, and the drainage unit can perform hot water supply and drainage according to temperature conditions. More specifically, the drainage unit is provided with a valve member, and when the temperature is equal to or lower than the set temperature, when the valve member is located at the first position and drains from the drainage section, and hot water in the set temperature range is supplied, The valve member moves to the second position and is discharged from the shower device. By setting it as such a structure, cold water is not discharged from a shower apparatus.

  The shower device described in Patent Document 2 below discharges residual water remaining in the shower hose after using the shower device, thereby preventing the residual water from being cooled and discharged as it is when the shower device is not used for a long time. it can.

JP 2010-65957 A Japanese Patent No. 3354489

  In the hot water supply device described in Patent Document 1, hot water discharged from the shower device can discharge only hot water in a set temperature range, but all hot water supplied is supplied while hot water below the set temperature is supplied. It will be thrown away, and wasteful water will increase.

  In addition, there may be a long distance between the water heater and the temperature control mechanism that mixes hot water with water to adjust to the set temperature hot water, and if the distance between the water heater and the temperature control mechanism is long, the amount of residual water is large. Therefore, it takes a long time to reach the set temperature range. If it takes a long time to reach the set temperature range, the amount of wasted water will increase, and the time that the user can take a shower after starting the water discharge operation will become longer.

  Although the shower apparatus described in the said patent document 2 can discharge | emit the residual water in a shower hose and can prevent that the residual water which temperature fell in the early stage of water discharge is discharged, the temperature of the supplied water is set temperature. In the following cases, all will be thrown away, and waste water will increase.

  The present invention has been made in view of such problems, and its purpose is to discharge hot water at a set temperature from the initial stage of water discharge, and to reduce the amount of wasted water from the start of the water discharge operation until the hot water at the set temperature is discharged. The object is to provide an instant hot water system for bathroom faucets that can be reduced.

  In order to solve the above-mentioned problems, a hot water system for a bathroom faucet according to the present invention is an instant hot water system for a bathroom faucet disposed on the upstream side of the bathroom faucet, and extends from the water heater side. A flow path, a heating means for heating water supplied from the first flow path, a second flow path for sending water heated by the heating means to the downstream side of the heating means, and the heating means. A third flow path that merges with the second flow path without passing through, a temperature adjustment mechanism that is provided on the downstream side of the second flow path and the third flow path, and that can adjust the temperature; and the temperature adjustment mechanism And a fourth channel that is a channel connecting the bathroom faucet, and residual water that is provided in the fourth channel and prevents hot water from remaining in the fourth channel after water is discharged from the bathroom faucet A discharge unit; and a control unit that controls the heating unit. The expansion water discharge means for discharging the expansion water which expands when the water supplied by the heating means is heated, and the expansion water discharge means discharges the expansion water. The expansion water discharge channel is arranged along the second channel.

  According to the first aspect of the present invention, by providing a heating means in the first flow path, even when the temperature of the water supplied from the water heater side is low, the heating means can heat the water and the user can discharge water. The time until hot water is discharged after the operation is started can be shortened. Therefore, it is possible to reduce the amount of water that is discharged without the user taking water, and to reduce the amount of wasted water.

  In addition, it is possible to heat the water supplied from the water heater by providing the heating means, but after using the bathroom faucet, water is supplied to the fourth flow path between the temperature adjustment mechanism and the bathroom faucet. The residual water does not use the bathroom faucet for a long time, resulting in a temperature drop. If water discharge is started in a state where the temperature of the remaining water is lowered, cold water is applied to the user, which causes discomfort. Therefore, by providing the remaining water discharge means in the fourth flow path, it is possible to suppress the water remaining after the user uses the bathroom faucet, and the remaining water is cooled and discharged as it is. Therefore, it is possible to prevent cold water from being applied to the user and causing discomfort.

  The heating means enables measures against hot water below the set temperature on the upstream side of the heating means and the residual water discharge means on the downstream side of the temperature adjustment mechanism, but the residual water remains between the heating means and the temperature adjustment mechanism. Measures against the temperature drop of the water used were insufficient. In many cases, the heating means cannot be placed in the bathroom due to problems such as electric shock, and the distance from the heating means to the temperature adjustment mechanism becomes long, and hot water below the set temperature is discharged for a long time. .

  Therefore, by disposing the expansion water discharge flow path along the second flow path, the expansion water passes through the expansion water discharge flow path and heat is applied to the second flow path. Residual water remaining in the road can be kept warm. Therefore, it is possible to suppress the temperature drop of the remaining water in the second flow path. Specifically, the volume of the water heated by the heating means expands. Since the pressure is increased by the expanded water whose volume has expanded, an expanded water discharge means for discharging the expanded water is required. Basically, the expanded water is generated during heating, and the expanded water is water having a high temperature. It is possible to keep the remaining water in the second flow path by using this high temperature water, and it is possible to prevent the user from discharging hot water below the set temperature for a long time after starting the water discharging operation.

  The expansion water discharge channel according to a second aspect of the invention is characterized in that it has a double-pipe structure configured to overlap with the second channel.

  By adopting the configuration of the second invention, the contact area between the second flow path and the expansion water discharge flow path increases, and more heat can be applied to the second flow path from the expansion water discharge flow path. It can suppress that the temperature of the residual water in a 2nd flow path falls.

  The expansion water discharge channel according to a third aspect of the invention is characterized in that a heat radiation preventing material is provided on the outer peripheral side of the expansion water discharge channel in order to prevent heat from escaping from the expansion water discharge channel.

  By adopting the configuration of the third invention, heat can be prevented from escaping from the surface not in contact with the second flow path, and the second flow path can be obtained without reducing the amount of heat of the expansion water passing through the expansion water discharge flow path. Can be heated.

  According to a fourth aspect of the present invention, the expansion water discharge channel is arranged in a spiral manner on the outer peripheral side of the second channel.

  Although it is conceivable to arrange both the expansion water discharge channel and the second channel in a spiral shape, if the second channel is arranged in a spiral shape, the channel length of the second channel becomes long, The amount of residual water existing in the second flow path also increases, and the amount of heat for keeping the residual water in the second flow path increases, but only the expansion water discharge flow path is arranged in a spiral shape. The remaining water can be kept warm without increasing the amount of the remaining water in the second flow path and without increasing the amount of heat for keeping the remaining water warm.

  The fifth invention further comprises a water discharge mode detecting means capable of detecting a water discharge mode in which hot water is discharged from the bathroom faucet and a water stop mode in which the water discharge mode ends and stops water discharge, The control unit increases the amount of heat given to the hot water by the heating means when the elapsed time is longer than when the elapsed time from the water stop mode is short.

  The temperature drop of the remaining water differs depending on the elapsed time, and even if it is heated uniformly, it may not be able to be heated above the set temperature, but the amount of heat given to the hot water by the heating means depending on the elapsed time By changing, it becomes possible to discharge hot water at a temperature equal to or higher than the set temperature even when the water stop mode is continued for a long time.

  According to the present invention, there is provided an instant hot water system for a bathroom faucet that can discharge hot water at a set temperature from the initial stage of water discharge and can reduce the amount of wasted water from the start of the water discharge operation until the hot water at the set temperature is discharged. Can do.

It is the schematic regarding 1st embodiment of this invention. It is the schematic regarding 2nd embodiment of this invention. It is the schematic regarding 3rd embodiment of this invention.

A first embodiment of an instant hot water system 1 for a bathroom faucet according to the present invention will be described with reference to the drawings.
FIG. 1 is a schematic view showing a hot water supply system 10 for a bathroom including an instant hot water system 1 for a bathroom faucet of the present invention. The building is provided with a water heater 12 for supplying hot water to the whole and a hot water supply pipe 14 for supplying hot water heated by the water heater 12. Moreover, the water supply piping 16 which supplies the water from the water supply source which is not shown in figure is also provided.

  The instant hot water system 1 for a bathroom faucet in the present invention is provided in the hot water supply pipe 14 in the vicinity of the target bathroom 6. First, the hot water supply pipe 14 branches into a water heater inflow pipe 32 that flows into the hot water storage type hot water heater 2 and a bypass pipe 34 that bypasses the hot water storage type hot water heater 2.

  The hot water storage water heater 2 includes a heater 24 (not shown) inside the hot water tank 22, and the heater 24 is configured to heat the hot water stored in the hot water tank 22. At this time, by adjusting the voltage applied to the heater 24, it is possible to adjust the amount of heat generated by the heater 24 and change the heating temperature.

  The hot water tank 22 is provided with expansion water discharge means 3 for treating volume-expanded water generated when the stored hot water is heated, so-called expansion water. The expansion water discharge means 3 has a function of a relief valve that releases hot water to the expansion water discharge pipe 36 on the downstream side when pressure is applied by the volume expansion of the hot water in the hot water tank 22. Moreover, it has a backflow preventing action and is configured to prevent hot water from flowing back into the hot water tank 22 from the downstream side.

  The hot water heated by the hot water storage type hot water heater 2 joins the bypass pipe 34 via the hot water supply pipe 38. A mixing valve 4 is provided at the junction, and is configured to adjust the mixing ratio of hot water flowing in from the hot water supply pipe 38 and the bypass pipe 34 according to the temperature of hot water flowing in from the bypass pipe 34. Yes. Immediately after the start of the hot water, the temperature of the hot water flowing in from the bypass pipe 34 is lowered by natural heat dissipation. For this reason, a lot of hot water from the outlet pipe 38 is mixed and raised to an appropriate temperature. When hot water is supplied from the water heater 12 to the bypass pipe 34 as well, the inflow ratio from the bypass pipe 34 is gradually decreased, and the downstream temperature is adjusted to be constant, and finally When the hot water flowing in from the bypass pipe 34 reaches a high temperature, the inflow from the hot water pipe 38 is stopped.

  The hot water mixed at an appropriate temperature by the mixing valve 4 passes through the mixed water pipe 40 and is supplied to the hot water side of the hot and cold water mixing faucet 62 of the shower device 60 provided in the bathroom 6. At this time, the water supply pipe 14 is joined to the water side of the hot and cold water mixing faucet 62. The hot and cold water mixing faucet 62 is configured to adjust the temperature and flow rate by manipulating the mixing amount and mixing ratio of the water supplied by the water supply pipe 24 and the hot water supplied by the mixed water pipe 40. Yes.

The hot and cold water mixing faucet 62 is connected to an overhead shower 64 of a shower device 60 provided inside the bathroom 6 through a shower pipe 66.
A drain pipe 82 is branched from the middle of the shower pipe 66. A drainage unit 8 is provided near the tip of the drainage pipe 68. The drainage unit 8 is provided with a valve that is closed when water pressure is applied and opened when the water pressure is no longer applied. That is, in a state where the hot and cold water mixing faucet 62 is operated and water is discharged, water pressure acts on the drainage unit 8, the drainage unit 8 is closed, and water is discharged from the overhead shower 64.

  Next, when the hot and cold water mixing faucet 62 is stopped, water discharge from the overhead shower 64 ends. At the same time, since the water pressure does not act on the drainage unit 8, the drainage unit 8 is opened. Thereby, all the water staying in the shower pipe 66 is drained from the drain outlet 84 into the bathroom 6 through the drain pipe 82. As a result, the shower pipe 66 is emptied at the same time as the end of the water discharge, so that it is possible to avoid a situation in which the hot water in the inside is cooled and the cold water is first discharged at the start of the next water discharge.

  In addition to this, the hot water inflow pipe 32, the bypass pipe 34, the hot water supply pipe 38, and the mixed water pipe 40 are raised as pipes in which hot water stays when the water stops. Of these, the hot water staying in the hot water inflow pipe 32 is reheated by the hot water tank 2, so that a temperature drop is not a big problem. Further, the bypass pipe 34 is not a problem because it is used while being mixed with hot water flowing from the hot water tank 2 while the temperature is low.

  Since the water staying in the mixed water pipe 40 is kept as it is, the water staying in the hot water supply pipe 38 flows into the shower pipe 66 through the mixed water pipe 40 and is discharged from the overhead shower 64, so that the user may touch it. There is. Therefore, in the present invention, the expansion water discharge means 3 is used as means for heating the hot water remaining in the mixed water pipe 40.

  The staying water in the hot water tank 2 is kept at a constant temperature by periodically raising it. For this reason, volume expansion occurs regularly and hot water is generated as expansion water. As described above, this hot water (expansion water) is discharged to the expansion water discharge pipe 36 through the expansion water discharge means 3. At this time, the expansion water discharge pipe 36 is arranged along the mixed water pipe 40 in a spiral manner on the outer peripheral side thereof, so that the heat of the expansion water is efficiently transmitted to the mixed water pipe 40. ing. Thereby, it is possible to retain and overheat the staying water inside the mixed water pipe 40, and it is possible to suppress the staying water inside from becoming cold water.

  In addition, about the location where this expansion water discharge piping 36 and the mixed water piping 40 mutually contact, it is preferable to comprise with a raw material with as high a heat conductivity as possible in order to promote heat exchange. For example, metal piping such as copper is preferable to resin piping.

  Furthermore, it is preferable to dispose the heat radiation prevention material 39 on the outer peripheral side of the expansion water discharge pipe 36 so as not to leak the heat of the expansion water to the outside. Thereby, it is possible to suppress the expansion water from being cooled before heat exchange with the mixed water pipe 40. As the heat radiation preventing member 39, various materials such as fiber heat insulating materials such as glass wool and foaming heat insulating materials such as urethane can be suitably used.

  The expanded water discharge pipe 36 is finally connected to the drain pipe 82 on the downstream side of the drain unit 8, and the expanded water after heat exchange is discharged from the discharge port 84 into the bathroom.

  Next, FIG. 2 shows a schematic diagram of the second embodiment of the present invention. Members common to those in the first embodiment are denoted by common reference numerals and description thereof is omitted.

  In the second embodiment, the shape of the expanded water discharge pipe 36 is different from that of the first embodiment, and has a double pipe structure that covers the periphery of the mixed water pipe 40. By comprising in this way, it becomes possible to cover the circumference | surroundings of the mixed water piping 40 without gap, and it becomes easy to suppress the temperature fall of the mixed water piping 40. FIG.

Next, about 3rd embodiment of this invention, a schematic diagram is shown in FIG. Members common to those in the first embodiment are denoted by common reference numerals and description thereof is omitted.
In the third embodiment, the shape of the expanded water discharge pipe 36 is different from that of the first embodiment, and has a double helix structure intertwined with the mixed water pipe 40. By comprising in this way, it becomes possible to increase a contact area with the mixed water piping 40, and it becomes possible to perform heat exchange with the mixed water piping 40 more actively.

  In this implementation system, a spouting water mode detection means 68 is provided in the middle of the piping of the shower device 60. The water discharge mode detection means 68 includes a flow sensor, and is configured to be able to determine whether the shower device 60 is currently in a water discharge state or a water stop state. The control unit 28 is configured to receive this state as an input.

  When the shower device 60 enters the water stop mode, the control unit 28 receives this signal and starts counting. And if the shower apparatus 60 receives the signal which became the water discharge mode again, it is comprised so that the calorie | heat amount which the heater 24 gives to hot water according to the elapsed time may be adjusted. By configuring in this way, it is possible to prevent excessive heating when time has not elapsed since the previous water discharge, while firmly heating even when the water stop mode lasts for a long period of time. It will be possible.

DESCRIPTION OF SYMBOLS 1 Hot water supply system for bathroom faucets 10 Hot water supply system 12 Water heater 14 Hot water supply piping 16 Water supply piping 2 Hot water storage water heater 22 Hot water tank 24 Heater 28 Control part 3 Expansion water discharge means 32 Hot water inflow piping 34 Bypass piping 36 Expansion water discharge pipe 38 Hot water discharge pipe 39 Heat radiation prevention material 4 Mixing valve 40 Mixed water pipe 6 Bathroom 60 Shower device 62 Hot water / water mixing faucet 64 Overhead shower 66 Shower pipe 68 Discharge water mode detection means 8 Drain unit 82 Drain pipe 84 Drain port

Claims (5)

An instant hot water system for a bathroom faucet disposed upstream of the bathroom faucet,
A first flow path extending from the water heater side;
Heating means for heating water supplied from the first flow path;
A second flow path for sending water heated by the heating means to the downstream side of the heating means;
A third flow path that merges with the second flow path without passing through the heating means;
A temperature adjustment mechanism provided on the downstream side of the second flow path and the third flow path and capable of adjusting the temperature;
A fourth flow path that is a flow path connecting the temperature adjustment mechanism and the bathroom faucet;
Residual water discharging means provided in the fourth flow path for preventing hot water from remaining in the fourth flow path after water is discharged from the bathroom faucet;
A controller for controlling the heating means,
The instant hot water system for a bathroom faucet has expansion water discharge means for discharging expansion water that expands when the water supplied by the heating means is heated,
The expansion water discharge means has an expansion water discharge channel for discharging expansion water,
The instant hot water system for a bathroom faucet, wherein the expansion water discharge channel is disposed along the second channel.   2. The instant hot water system for a bathroom faucet according to claim 1, wherein the expansion water discharge channel has a double pipe structure configured to overlap with the second channel.   The expansion water discharge flow path has a heat radiation prevention material on the outer peripheral side of the expansion water discharge flow path in order to prevent heat from escaping from the expansion water discharge flow path. An instant hot water system for a bathroom faucet according to claim 1.   The said hot water discharge flow path arrange | positions the outer peripheral side of the said 2nd flow path spirally, The instant hot water system for bathroom faucets of any one of Claim 1 thru | or 3 characterized by the above-mentioned. Further comprising a water discharge mode detecting means capable of detecting a water discharge mode in which hot water is discharged from the bathroom faucet and the water discharge mode is terminated and the water discharge mode is stopped.
5. The control unit according to claim 1, wherein the amount of heat given to the hot water by the heating unit is higher when the elapsed time is longer than when the elapsed time from the water stop mode is shorter. An instant hot water system for a bathroom faucet according to claim 1.

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