JP2015194268A - Instantaneous water heater unit - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide an instantaneous water heater unit capable of improving user's comfort while securing hygiene.SOLUTION: An instantaneous water heater unit 4 includes a discharge pipe 21 connected to a prescribed region of a hot water supply pipe 11 connecting a water heater 2 and a faucet 3A of a shower booth 3, a unit solenoid valve 22 disposed on the discharge pipe 21, a unit check valve 23 disposed on a region at a reverse side of the hot water supply pipe 11 side with respect to the unit solenoid valve 22, of the discharge pipe 21, a unit thermistor 24 disposed on a region at the hot water supply pipe 11 side with respect to the unit solenoid valve 22, of the discharge pipe 21, and a unit control portion 25 controlling the unit solenoid valve 22 on the basis of a signal output from the unit thermistor 24.

Description

  The present invention relates to an instant hot water unit, which is suitable when hot water is immediately discharged from a bathroom shower.

  Conventionally, a hot water supply system is known in which water supplied from a water supply pipe is heated by a water heater, and hot water is supplied from the water heater to the water faucet via the hot water supply pipe. In such a hot water supply system, hot water is heated to a temperature set by a remote controller.

  However, since hot water continues to be stored in the hot water supply pipe until the faucet is opened, it tends to dissipate and cool, and after the faucet is opened, the water heater starts heating, so that the hot water enters the faucet. In some cases, the hot water that has been stored in the hot water supply pipe and cooled down is discharged until it reaches.

  As one of countermeasures in such a case, there is a hot water supply device described in Patent Document 1 below. This hot water supply apparatus of Patent Document 1 has a hot water supply circuit that branches off from a hot water supply circuit just before the faucet toward the bathtub, and the temperature sensor of the hot water supply circuit detects a temperature above a certain temperature in the hot water supply circuit. Water is discharged into the bathtub through the hot water circuit.

JP 2000-213805 A

  However, for example, at a beach, a shower booth is installed but a bathtub is not installed. In this case, it is conceivable that the end of the hot water circuit in Patent Document 1 is disposed in the shower booth, and the water in the hot water supply circuit is discharged into the shower booth via the hot water circuit.

  When the end of the hot water supply circuit is placed in the shower booth, in order to prevent water from flowing back from the shower booth drain to the hot water supply circuit, In the meantime, it is necessary to secure a space (water discharge space) for a legal distance.

  However, if a water discharge space is secured in the shower booth, the use space of the shower is reduced by that amount, and the user's comfort may be impaired. On the other hand, if the water discharge space is omitted, hygiene may be impaired due to the backflow from the drain port.

  The present invention has been made in consideration of the above points, and an object of the present invention is to propose an instant hot water unit that can improve user comfort while ensuring hygiene.

  In order to solve this problem, the instant hot water unit of the present invention includes a discharge pipe connected to a predetermined part of a hot water supply pipe connecting a water heater and a faucet of a shower booth, and a unit solenoid valve provided in the discharge pipe. And a unit check valve provided in a portion opposite to the hot water supply pipe side with respect to the unit solenoid valve in the discharge pipe, and a hot water supply pipe in reference to the unit electromagnetic valve in the discharge pipe. It comprises a unit thermistor provided in a site on the side, and a unit controller for controlling the unit electromagnetic valve based on a signal output from the unit thermistor.

In this immediate hot water unit, when the unit solenoid valve is opened, hot water in the hot water supply pipe is discharged from the discharge pipe, and hot water is supplied to the hot water supply pipe from the hot water heater. Therefore, in the immediate hot water unit, when the temperature based on the signal output from the unit thermistor falls to a predetermined temperature, the unit controller opens the unit solenoid valve so that the hot water in the hot water supply pipe is kept above a certain temperature. Can be maintained.
The discharge pipe is provided with a unit check valve. For this reason, even if the end of the discharge pipe is provided in the shower booth without ensuring a legal water discharge space between the shower booth outlet and the discharge pipe outlet, Can be prevented.
Thus, an instant hot water unit that can improve the comfort of the user while ensuring hygiene is realized.

It is a figure which shows the hot water supply system in this embodiment. It is a figure which shows a part of hot water supply system in 2nd Embodiment. It is a figure which shows a part of hot water supply system in 3rd Embodiment.

Hereinafter, embodiments of the present invention will be described in detail with reference to the drawings.
(1) 1st Embodiment As shown in FIG. 1, the hot water supply system 1 of this embodiment has the hot water heater 2, the shower booth 3, and the instant hot water unit 4. As shown in FIG.

  When the hot water heater 2 detects that hot water stored in the hot water supply pipe 11 is flowing using an internal flow sensor, it takes water from the water supply pipe 12 and heats it to the set temperature of the hot water supply. The hot water obtained as a result is sent out to the hot water supply pipe 11. The hot water supply set temperature is a temperature to be supplied to the hot water supply pipe 11, and is set for the water heater 2 from a remote controller, for example.

  The shower booth 3 includes a faucet 3A provided on the side wall, a shower 3B provided on the faucet 3A, and a drain port 3C provided on the bottom wall. A hot water supply pipe 11 is connected to the faucet 3A. When this faucet 3A is used and in an open state, hot water stored in the hot water supply pipe 11 is discharged from the shower 3B through the faucet 3A. At the same time, hot water at a hot water supply set temperature is supplied from the water heater 2. A drain pipe 13 is connected to the drain outlet 3C, and hot water in the shower booth 3 is discharged from the drain outlet 3C to the drain pipe 13.

  The immediate hot water unit 4 includes a discharge pipe 21, a unit electromagnetic valve 22, a unit check valve 23, a unit thermistor 24 and a unit controller 25 as main components.

  The discharge pipe 21 is connected to a predetermined portion of the hot water supply pipe 11 that connects the water heater 2 and the faucet 3 </ b> A of the shower booth 3. In the present embodiment, one end of the discharge pipe 21 is connected to a predetermined part of the hot water supply pipe 11 via the joint member JT1, and the other end of the discharge pipe 21 is connected to a predetermined part of the drain pipe 13 via the joint member JT2. The discharge pipe 21 connects the hot water supply pipe 11 and the drain pipe 13. In addition, the discharge pipe 21 is disposed outside the shower booth 3.

  The unit solenoid valve 22 is provided in the discharge pipe 21 and opens and closes in response to a command from the unit controller 25. When the unit solenoid valve 22 is in an open state, the hot water stored in the hot water supply pipe 11 flows from the hot water supply pipe 11 to the discharge pipe 21. In this case, hot water at a hot water supply set temperature is supplied from the water heater 2 to the hot water supply pipe 11 until the unit solenoid valve 22 is closed.

  The unit check valve 23 is provided in a portion of the discharge pipe 21 opposite to the hot water supply pipe 11 with respect to the unit electromagnetic valve 22 and flows from the discharge pipe 21 toward the hot water supply pipe 11. prevent.

  The unit thermistor 24 is provided in a portion of the discharge pipe 21 on the hot water supply pipe 11 side with the unit electromagnetic valve 22 as a reference, measures the temperature of the hot water in the discharge pipe 21 and outputs a signal indicating the temperature. The data is sent to the unit controller 25.

  The unit controller 25 is connected to the water heater 2 via a multicore cable, and is driven using a power supply voltage supplied from the water heater 2 via the multicore cable. The unit controller 25 is connected to the unit electromagnetic valve 22 and the unit thermistor 24, and appropriately controls the unit electromagnetic valve 22 based on a signal output from the unit thermistor 24.

  That is, the unit controller 25 acquires the temperature of the hot water stored in the discharge pipe 21 at predetermined intervals based on the signal output from the unit thermistor 24. Further, when the unit control unit 25 acquires a temperature based on a signal output from the unit thermistor 24, the unit control unit 25 compares the acquired temperature with a specified temperature that is defined as a predetermined temperature lower than the hot water supply set temperature.

  Here, when the acquired temperature is equal to or higher than the specified temperature, this means that the temperature of the hot water stored in the hot water supply pipe 11 is in the same range as the hot water supply set temperature, and the hot water is changed to the hot water set temperature. This means that there is little need for replacement. In this case, the unit controller 25 closes the unit electromagnetic valve 22.

  On the other hand, when the acquisition temperature is lower than the specified temperature, this means that the temperature of hot water stored in the hot water supply pipe 11 is low, and it is necessary to replace the hot water with hot water at the hot water supply set temperature. Means. In this case, the unit controller 25 opens the unit electromagnetic valve 22 until the temperature based on the signal output from the unit thermistor 24 reaches the hot water supply set temperature, and discharges the hot water stored in the hot water supply pipe 11. The hot water is discharged to the drain pipe 13 via 21 and replaced with hot water having a preset hot water supply temperature.

  As described above, in the instant hot water unit 4 according to the present embodiment, when the unit solenoid valve 22 is opened, hot water in the hot water supply pipe 11 is discharged from the discharge pipe 21 and warm water is supplied to the hot water supply pipe 11. Supplied from the water heater 2.

  Therefore, in the hot water unit 4, when the temperature based on the signal output from the unit thermistor 24 is lowered to the specified temperature, the unit controller 25 opens the unit electromagnetic valve 22, so that the hot water in the hot water supply pipe 11 is opened. Can be maintained above a certain temperature. As a result, the immediate hot water unit 4 can prevent the cooled hot water stored in the hot water supply pipe 11 from being discharged from the shower 3B.

  The discharge pipe 21 is provided with a unit check valve 23. For this reason, when the end part of the discharge pipe 21 is provided in the shower booth 3 without securing a legal water discharge space between the drain outlet 3C of the shower booth 3 and the discharge outlet of the discharge pipe 21. Even if it exists, backflow can be prevented. Thus, an instant hot water unit that can improve the comfort of the user while ensuring hygiene is realized.

  In the case of this embodiment, the discharge pipe 21 is arranged outside the shower booth 3. For this reason, the instant hot water unit 4 in this embodiment can avoid that the use space of the shower 3B is narrowed by the discharge piping 21, and can further improve the user's comfort.

  The discharge pipe 21 connects the hot water supply pipe 11 and the drain pipe 13. For this reason, the instant hot water unit 4 in the present embodiment can avoid discharging the cold hot water stored in the hot water supply pipe 11 into the shower booth 3. Therefore, the instant hot water unit 4 prevents the shower booth 3 in a dry state from being wetted unnecessarily, and prevents the user using the shower 3B from touching the cold hot water stored in the hot water supply pipe 11. Can do.

(2) 2nd Embodiment Next, the hot water supply system in 2nd Embodiment is demonstrated. However, among the components of the hot water supply system of the present embodiment, the same or equivalent components as those in the first embodiment are denoted by the same reference numerals, and redundant description will be omitted as appropriate.

  As shown in FIG. 2, the hot water supply system of the present embodiment is different from the hot water supply system of the first embodiment in that a discharge pipe 31 is provided instead of the discharge pipe 21 of the first embodiment.

  That is, one end of the discharge pipe 21 in the first embodiment is connected to a predetermined part of the hot water supply pipe 11 via the joint member JT1, and the other end of the discharge pipe 21 is connected to the predetermined part of the drain pipe 13 with the joint member JT2. Was connected through. Further, the discharge pipe 21 is disposed outside the shower booth 3.

  On the other hand, one end of the discharge pipe 31 of the present embodiment is connected to a predetermined portion of the hot water supply pipe 11 via the joint member JT1, but the other end of the discharge pipe 31 is an open end. Further, the end of the discharge pipe 31 on the open end side is disposed inside the shower booth 3, and the discharge pipe portion other than the end is through a through hole 3 </ b> D formed in the side wall of the shower booth 3. And arranged outside the shower booth 3.

  In the case of this embodiment, the end of the discharge pipe 31 arranged in the shower booth 3 is a predetermined distance above the drain outlet 3C of the shower booth 3 and between the outlet and the outlet 3C of the end. They are spaced apart by d.

  As described above, in the instant hot water unit 4 of the present embodiment, the end of the discharge pipe 31 is arranged inside the shower booth 3, and the unit check valve 23 is provided in the discharge pipe 31.

  For this reason, the instant hot water unit 4 of the present embodiment does not secure a legal water discharge space between the drain port 3C of the shower booth 3 and the water discharge port of the discharge pipe 31, and the end of the discharge pipe 31. Can be provided in the shower booth 3.

  That is, the immediate hot water unit 4 has a distance d between the water discharge port of the discharge pipe 31 and the drain port 3C of the shower booth 3 as compared with the case where the unit check valve 23 is not provided in the discharge pipe 31. Can be small.

  Therefore, the instant hot water unit 4 prevents the cold water in the hot water supply pipe 11 from flowing backward and being discharged from the shower 3B while ensuring a wide space for using the shower 3B by an amount that can reduce the distance d. be able to.

  In the first embodiment, the cold hot water stored in the hot water supply pipe 11 is not discharged into the shower booth 3. For this reason, from the viewpoint of preventing the hot water stored in the hot water supply pipe 11 from getting wet with the shower booth 3 and preventing the hot water from touching the user who uses the shower 3B, the above-mentioned is compared with the present embodiment. The first embodiment is preferred.

  Further, in the first embodiment, the through hole 3D is not drilled. For this reason, the said 1st Embodiment is preferable compared with this embodiment also from the viewpoint of maintaining the existing state in the shower booth 3, and the surface of workability.

  Furthermore, since the shower booth 3 is small, it is difficult to see the feet, and the feet are slippery because the slippery drainage that is washed away with soap and shampoo flows. In the said 1st Embodiment, piping protrudes from the foot side wall of the shower booth 3, and it does not discharge | emit to the drain port 3C of the shower booth 3. For this reason, from the viewpoint of avoiding danger to the user, the first embodiment is preferable to the present embodiment.

(3) 3rd Embodiment Next, the hot water supply system in 3rd Embodiment is demonstrated. However, among the components of the hot water supply system of the present embodiment, the same or equivalent components as those in the first embodiment are denoted by the same reference numerals, and redundant description will be omitted as appropriate.

  As shown in FIG. 3, the hot water supply system of the present embodiment is different from the hot water supply system of the first embodiment in that a unit path switching valve 26 and a water storage tank 27 are newly provided.

  The unit path switching valve 26 is provided in a portion of the discharge pipe 21 opposite to the hot water supply pipe 11 side with the unit check valve 23 as a reference. The unit path switching valve 26 is a valve that selectively switches between a first path 21A passing through the discharge pipe 21 from the installation site and a second path 21B detaching the discharge pipe 21 from the installation site. Then it is a three-way valve.

  When the unit path switching valve 26 is switched to the first path 21A, the hot water flowing from the hot water supply pipe 11 to the discharge pipe 21 is discharged to the drain pipe 13 via the first path 21A. On the other hand, when the unit path switching valve 26 is switched to the second path 21B, the hot water flowing from the hot water supply pipe 11 to the discharge pipe 21 is discharged to the water storage tank 27 connected to the second path 21B.

  The water storage tank 27 is disposed outside the shower booth 3 and the immediate hot water unit 4, and is connected to the three-way valve 27B via the reuse pipe 27A. The three-way valve 27B selectively switches between the water supply pipe 12 and the reuse pipe 27A under the control of the water heater 2, for example, and is connected to the water heater 2 or a predetermined faucet. When the reuse pipe 27A and the water heater 2 are connected by the three-way valve 27B, the water stored in the water storage tank 27 is supplied to the water heater 2, heated in the water heater 2 as necessary, and reused. be able to. Alternatively, when the reuse pipe 27A and a predetermined faucet are connected via the three-way valve 27B without passing through the water heater 2, the water stored in the water storage tank 27 can be used for washing a car or irrigating plants.

  The water storage tank 27 may be disposed inside or outside the water heater 2, and heats the water stored in the water storage tank 27 to a predetermined temperature under the control of the unit control unit 25. You may have a mechanism. Further, when a mechanism for heating the water in the water storage tank 27 is provided, even when water stored in the water supply pipe 12 is supplied without using the water heater 2, the heated water can be supplied. it can.

  The unit control unit 25 is connected to the unit path switching valve 26 and appropriately controls the unit path switching valve 26 according to the water level stored in the water storage tank 27.

  That is, the unit control unit 25 is stored in the water storage tank 27 based on, for example, a signal output from a water level meter provided in the water storage tank 27 or a signal output from a pressure sensor provided in the discharge pipe 21. The water level is detected at predetermined intervals.

  And the unit control part 25 switches the unit path | route switching valve 26 from the 1st path | route 21A to the 2nd path | route 21B, when the water level at the time of a detection is less than a predetermined water level. On the other hand, the unit control unit 25 switches the unit path switching valve 26 from the second path 21B to the first path 21A when the water level at the time of detection is equal to or higher than the predetermined water level.

  As described above, in the instant hot water unit 4 of the present embodiment, the unit path switching valve 26 is provided in a portion of the discharge pipe 21 opposite to the hot water supply pipe 11 with respect to the unit electromagnetic valve 22.

  The unit path switching valve 26 selectively switches between a first path 21A that goes to the downstream end of the discharge pipe 21 and a second path 21B that deviates from the discharge pipe 21. For this reason, the hot water unit 4 not only discharges the hot water stored in the hot water supply pipe 11 from the drain pipe 13 via the first path 21A, but also discharges the hot water into the water storage tank 27 via the second path 21B. Can be stored and reused.

  In addition, the unit path | route switching valve 26 and the water storage tank 27 in this embodiment are applicable also to the said 2nd Embodiment. That is, the unit path switching valve 26 is provided in a portion of the discharge pipe 31 opposite to the hot water supply pipe 11 side with respect to the unit electromagnetic valve 22, and the unit path switching valve 26 and the water tank 27 are the second. They are connected via the path 21B. If it does in this way, also in the instant hot water unit 4 of the said 2nd Embodiment, the hot water stored in the hot water supply piping 11 can be stored in the water storage tank 27, and can be reused.

(4) Modified Example In the above embodiment, the discharge pipe 21 or the discharge pipe portion other than the end in the discharge pipe 31 is disposed outside the shower booth 3. However, these may be arranged between the inner wall and the outer wall of the shower booth 3. In short, the discharge piping 21 or the discharge piping portion other than the end portion in the discharge piping 31 may be disposed outside the inner wall of the shower booth 3.

  In the third embodiment, a three-way valve is used as the unit path switching valve 26, and the first path 21A and the second path 21B are both one path. However, the number of paths of the first path 21A or the second path 21B may be increased to 2 or more using, for example, a five-way valve. In such a case, the discharge time in the hot water supply pipe 11 can be shortened by an increase in the number of paths.

  In the third embodiment, the unit path switching valve 26 is controlled by the unit controller 25 of the immediate hot water unit 4. However, the control unit of the water heater 2 may control the unit path switching valve 26.

  In the third embodiment, the unit path switching valve 26 is controlled according to the water level of the water stored in the water storage tank 27. However, the control method may be a method other than the third embodiment. For example, the unit path switching valve 26 may be controlled according to the weight of water stored in the water storage tank 27 instead of the water level. Further, a turbidity detector is provided in the discharge pipe 21, and the turbidity is detected based on a signal output from the turbidity detector. When the detected turbidity is less than the threshold value, the unit path switching valve 26 is set. Switch from the first route 21A to the second route 21B. On the other hand, when the detected turbidity is equal to or higher than the threshold, the unit path switching valve 26 is switched from the second path 21B to the first path 21A. In this way, clean water can be stored in the water storage tank 27 as compared with the case where no turbidity detector is provided.

  The present invention may be used in the field of handling domestic or commercial water heaters.

1 …… Hot water supply system 2 …… Water heater 3 …… Shower booth 3A …… Water faucet 3B …… Shower 3C …… Drain port 3D …… Through hole 4 …… Immediate hot water unit 11 …… Hot water supply pipe 12 …… Water supply pipe 13 …… Drain pipe 21, 31 …… Drain pipe 22 …… Unit solenoid valve 23 …… Unit check valve 24 …… Unit thermistor 25 …… Unit control unit 26 …… Unit path switching valve 27 …… Water tank

Claims (4)

A discharge pipe connected to a predetermined part of the hot water supply pipe connecting the water heater and the faucet of the shower booth;
A unit solenoid valve provided in the discharge pipe;
Among the discharge pipes, a unit check valve provided at a site opposite to the hot water supply pipe side with respect to the unit solenoid valve;
Among the discharge pipes, a unit thermistor provided at a site on the hot water supply pipe side with respect to the unit solenoid valve;
An immediate hot water unit comprising: a unit control unit that controls the unit electromagnetic valve based on a signal output from the unit thermistor. Of the discharge pipe, the end of the hot water supply pipe opposite to the side connected to the predetermined part is disposed inside the shower booth, and the discharge pipe part other than the end is the inner wall of the shower booth. The instant hot water unit according to claim 1, wherein the instant hot water unit is disposed on the outer side. The said discharge piping is arrange | positioned outside the inner wall of the said shower booth, and connects the drainage pipe connected to the drain outlet of the said shower booth, and the said hot water supply piping, Immediately of Claim 1 characterized by the above-mentioned. Hot water unit. Among the discharge pipes, a first path toward the end of the discharge pipe and a second path away from the discharge pipe are provided at a site opposite to the hot water supply pipe side with respect to the unit solenoid valve. The instant hot water unit according to claim 2, further comprising a unit path switching valve that selectively switches between the two.

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