JP2011017510A - Bath device - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a bath device having a plurality of bathtubs connected to one bath circulating circuit and capable of efficiently reheating the bathtubs individually without waste.SOLUTION: In the bath device capable of individually reheating a first bathtub 18 and a second bathtub 19 by one bath circulating circuit 17, a remaining hot water heat exchanger 33 is provided in the bath circulating circuit 17. During the reheating of one of the bathtubs, when a remaining hot water temperature in the other bathtub is higher by a predetermined temperature or higher than the temperature of bathtub hot water to be reheated, the reheating is performed while heat is absorbed from the remaining hot water by the remaining hot water heat exchanger 33. Thus, this enables efficient reheating without waste by using a remaining hot water heat quantity in the other bathtub.

Description

  The present invention relates to a bath apparatus in which two bathtubs are selectively connected to one bath circulation circuit, and the amount of heat of the remaining hot water in the other bathtubs is also used for reheating when reheating in one of the bathtubs. Is.

  Conventionally, in this type of water, a hot water pipe having a solenoid valve in each of the two bathtubs, a return pipe of the bath circulation circuit, and an outgoing pipe are connected. As the valve is opened and the other solenoid valve is closed, one of the bathtubs is filled with water, and the other of the bathtubs is filled with the reverse. If one solenoid valve is opened and the other solenoid valve is closed, one bathtub is reheated. If the opposite solenoid valve is further opened, the other bathtub is reheated and one bath is reheated. Using the circulation circuit, the hot water filling and reheating of the two bathtubs were performed satisfactorily. (See Patent Document 1)

JP 7-324808 A

  By the way, in this conventional one, when it is used in a two-family house, it is very economical and inexpensive because only one unit is required and two units are unnecessary. For example, one bathtub is used alone. When reheating, even if a large amount of remaining hot water remains immediately after the other bathtub is reheated, this remaining hot water cannot be used easily, and the retained heat in the hot water storage tank must be used. Thus, there is a problem that efficient heat cannot be used, heat is wasted, and this heat cannot be recovered.

  The present invention pays attention to this point and solves the above-mentioned drawbacks. In particular, the configuration is achieved by heat exchange between a hot water storage tank for storing hot water heated by the heating means and hot water stored in the upper part of the hot water storage tank. A bath heat exchanger for heating bath water, a bath circulation circuit comprising a return pipe and a forward pipe having a bath circulation pump connected to the bath heat exchanger, a return three-way valve and a forward three-way valve to the bath circulation circuit And a control circuit for switching the flow path of the return three-way valve and the forward three-way valve, and replenishing the first and second bathtubs with one bath circulation circuit. The bath circulation circuit is provided with a remaining hot water heat exchanger, and the temperature of the remaining hot water in the other bathtub is determined by the temperature of the remaining hot water in the other bathtub. If it is higher than the temperature, the remaining hot water heat exchanger It is obtained so as to reheating while absorbing heat from.

  Further, in claim 2, the remaining hot water heat exchanger is connected in parallel to a return pipe connecting the return three-way valve and the bath circulation pump, and a remaining hot water return three-way valve connected in parallel to the return three-way valve and the forward three-way valve. The remaining hot water passage connecting the three-way valve of the remaining hot water is integrally formed, and the remaining hot water passage on the entrance side of the remaining hot water heat exchanger is provided with a remaining hot water temperature sensor.

  As described above, according to the present invention, when one bathtub is reheated, if the remaining hot water temperature of the other bath that is not reheated is higher than the reheated bath water temperature by a predetermined temperature, this reheating is not performed. The remaining hot water in the bathtub is distributed to the remaining hot water heat exchanger and absorbed in the bath water to be reheated. In addition, the use of the amount of heat retained in the hot water storage tank can be suppressed as much as possible, and there is no waste and efficient replenishment is always performed, which is extremely convenient.

  Further, in claim 2, the remaining hot water heat exchanger is connected in parallel to a return pipe connecting the return three-way valve and the bath circulation pump, and a remaining hot water return three-way valve connected in parallel to the return three-way valve and the forward three-way valve. The remaining hot water passage connecting the three-way valve to the remaining hot water is integrally formed, and the remaining hot water passage on the entrance side of the remaining hot water heat exchanger is equipped with a remaining hot water temperature sensor. However, even if either the 1st tub or the 2nd tub is the sole reheating tub side, the reheating and the supply of the remaining hot water can be performed smoothly. It can be used efficiently without worrying.

BRIEF DESCRIPTION OF THE DRAWINGS Schematic explanatory drawing of the bath apparatus which shows one Embodiment of this invention. The block diagram of the principal part electric circuit. The flowchart of the simultaneous hot water operation of the setting temperature difference of the 1st bathtub and the 2nd bathtub. The flowchart of the chasing operation of the 1st bathtub. The flowchart of the chasing operation of the 2nd bathtub.

Next, an embodiment of a hot water storage type hot water supply apparatus incorporating the bath apparatus of the present invention will be described with reference to the drawings.
1 is a cylindrical hot water storage tank that uses heating means 2 composed of a heat-pump unit using carbon dioxide refrigerant to boil hot water in the midnight hours when the unit price of contract power by time is low and store hot water. The lower part is connected to a water supply pipe 3 for supplying water, and the upper part is connected to a hot water discharge pipe 4 for discharging hot water stored in a hot water tap or the like.

  5 is composed of a hot water supply pipe 4 on one side, a first water supply bypass pipe 6 branched from the water supply pipe 3 on the other side, and a SAM type (shape memory alloy built-in type) electric three-way valve with a hot water supply pipe 7 connected to the center. The hot water mixing valve mixes the hot water from the hot water discharge pipe 4 and the water supply from the first water supply bypass pipe 6 to perform hot water supply at a hot water supply set temperature.

  8 is connected to a hot water discharge pipe 9 branched from the hot water discharge pipe 4 on one side, a second water supply bypass pipe 10 branched from the first water supply bypass pipe 6 on the other side, and a hot water filling circuit 11 connected to the center. A bath mixing valve composed of a three-way valve mixes high-temperature water from the bath outlet pipe 9 and the feed water from the second feed water bypass pipe 10 to perform a predetermined amount of hot water filling to a predetermined temperature. Is.

  A hot water flow counter 12 is provided in the hot water filling circuit 11 and counts the flow rate of hot water filling, and starts counting when the hot water solenoid valve 13 provided downstream is opened. Further downstream, two check valves 14 and 15 that allow flow in the hot water direction but prevent reverse flow are provided, and between the two check valves 14 and 15 and the bath mixing valve 8. A drain pipe having a drain valve 16 communicating with the hot water flow rate counter 12 is provided.

  Reference numeral 17 denotes a bath circulation circuit in which the first and second bathtubs 18 and 19 and the bath heat exchanger 20 provided in the upper part of the hot water storage tank 1 are connected by the return pipe 21 and the forward pipe 22, and the hot water filling circuit 11 communicates. The return pipe 21 is provided with a bath thermistor 23 that detects both the hot water temperature of the hot water bath and the hot water of the bath water. The return pipe 21 further includes a bath circulation pump 24 and a water level sensor. 25, and the first bathtub 18 and the second bathtub 19 connect the return pipe 21 to the center, connect one to the first bathtub 18 and the other to the second bathtub 19, and connect to the return pipe 21. Are connected to the first bathtub 18 and the second bathtub 19, the forward pipe 22 is connected to the center, one is connected to the first bathtub 18 and the other is connected to the second bathtub 19. Via a forward three-way valve 27 that switches the connection of the first bathtub 18 and the second bathtub 19 It is connected to the bath circulation circuit 17.

  A bypass path 28 bypasses the bath heat exchanger 20 in the middle of the bath circulation circuit 17, and is connected to the center of the bypass three-way valve 29 provided in the return pipe 21, while the return pipe 21 connected to the bath heat exchanger 20 is connected. On the other hand, a return pipe 21 to which the hot water filling circuit 11 communicates is connected, and the remaining hot water in the bath heat exchanger 20 is heated by the high-temperature water in the upper part of the hot water storage tank 1 while the reheating is stopped. The rise of the remaining hot water is discharged to the first bathtub 18 or the second bathtub 19 at the start of reheating, and is heated from the bypass 28 to the remaining hot water flowing out from the bath heat exchanger 20 in order to prevent the risk of burns. The temperature of the return pipe 21 is reduced by mixing the bath water of the return pipe 21 so that the temperature of the mixed water is detected at the junction of the bypass passage 28 and the forward pipe 22 so as not to cause a burn. Mixing by bypass three-way valve 29 It is intended to control.

  Reference numeral 30 denotes a control circuit composed of a microcomputer for controlling each part, to which a first remote controller 31 provided for the first bathtub 18 and a second remote controller 32 provided for the second bathtub 19 are connected. When the first remote control 31 is operated, the return three-way valve 26 and the forward three-way valve 27 are set in the first bathtub. 18 is switched so as to be in communication with the bath circulation circuit 17, and when the second remote control 32 is operated, the return three-way valve 26 and the forward three-way valve 27 are connected to the first bathtub 18 with the bath circulation circuit 17. When the remote controller 31 or 32 instructs the hot water filling operation such as automatic bathing at the same time in a state where the set temperature of the bath is different, the remote controller 31 or 32 has the lower set temperature. 1st bathtub 18 or 2nd bath 19 is connected to the return pipe 21 side by the return three-way valve 26, and the first bathtub 18 or the second bathtub 19 having the higher set temperature is connected to the forward pipe 22 side which is a hot water filling path passing through the bath heat exchanger 20. The forward three-way valve 27 is switched so as to communicate with the forward three-way valve 27.

  The control circuit 30 stores whether one of the most recently used bathtubs is selected by the operation selection of the remote controllers 31 and 32, the first bathtub 18 or the second bathtub 19, and further stores what is selected for operation. In the case where this operation selection is a chasing, heat-retaining, and hot water filling, and when the bathtub to be used next is another other bathtub according to the operation selection of each remote controller 31 and 32, Before starting the operation, the bath circulation circuit 17 and the bypass passage 28 are purged with water supply, that is, the bath mixing valve 8 is set to the 100% open state on the second water supply bypass pipe 10 side, and the hot water solenoid valve 13 is turned on. When opened, the feed water flows into the bath circulation circuit 17 through the hot water filling circuit 11, and the bath water of one of the bathtubs used before remaining in the bath circulation circuit 17 is returned to the bathtub and the bath circulation circuit 17. Fresh salary After filling in, since to start operation of the other of the bathtub, it is obtained by well freely use swept discomfort when using shared bath circulation circuit 17.

  Reference numeral 33 denotes a return pipe 21 between the return three-way valve 26 and the bath circulation pump 24, a remaining hot water return 34 connected in parallel with the return three-way valve 26, and a remaining hot water outlet connected in parallel with the forward three-way valve 27. In the remaining hot water heat exchanger formed by integrally forming the remaining hot water passage 36 connecting the three-way valve 35, the remaining hot water passage 36 connecting the remaining hot water return three-way valve 35 and the remaining hot water heat exchanger 33 includes: A remaining hot water temperature sensor 37 that detects the remaining hot water temperature before flowing into the remaining hot water heat exchanger 33 is provided, and a remaining hot water circulation pump 38 that circulates the remaining hot water after the heat exchange further includes the remaining hot water heat exchanger 33 and the remaining hot water heat exchanger 33. The remaining hot water passage 36 is connected to the hot water going-out three-way valve 35, and the remaining hot water returning three-way valve 34 and the remaining hot water going-up three-way valve 35 are used regardless of whether the first bathtub 18 or the second bathtub 19 has hot water. The remaining hot water is circulated through the remaining hot water heat exchanger 33 by adding the remaining hot water. It is obtained so as to improve as much energy efficiency.

A water supply thermistor 39 is provided in the water supply pipe 3 to detect the water supply temperature, and 40 is a pressure reducing valve for reducing the water supply pressure.
A heating circulation circuit 41 includes a heating forward pipe 42, a heating return pipe 43, and a heating circulation pump 44 that connect the hot water storage tank 1 and the heating means 2 so that hot water can circulate.
Reference numerals 45, 46, 47, 48 and 49 are hot water storage temperature sensors provided above and below the outer peripheral surface of the hot water storage tank 1, and 50 is a pressure relief valve provided in the hot water discharge pipe 4.
Reference numeral 51 denotes a forward temperature sensor which detects the hot water temperature obtained by mixing the hot water heated by the bath heat exchanger 20 and the bypass water from the bypass passage 28 by the bypass three-way valve 29 and is used as the set temperature hot water. 52 is a tank unit.

Next, the operation of this embodiment will be described.
In the midnight time zone of the contract power now, the low-temperature water in the lower part of the hot water tank 1 is boiled by the heating means 2 by the heating circuit 36, the hot water is returned to the upper part of the hot water tank 1, and this circulation is repeated sequentially from 23:00. The hot water is stored in the entire hot water storage tank 1 by 7 o'clock the next morning.

  And the hot water in this hot water storage tank 1 is mixed with the hot water from the hot water discharge pipe 4 and the hot water from the 1st hot water bypass pipe 6 with the hot water supply mixing valve 5, and is utilized for hot water supply as hot water of hot water supply preset temperature. Is.

  Next, a case where a filling operation in which the set temperatures are different at the same time in the first bathtub 18 and the second bathtub 19 is instructed will be described with reference to the flowchart of FIG. 3. In step 53, the first remote control 31 and the second remote control 32 are now used. At the same time, it is determined whether or not a hot water filling operation has been instructed. If YES, the routine proceeds to step 54 where the control circuit 30 returns the bathtub with the low set temperature to the return three-way valve 26 and communicates with the return pipe 21 side. The valve 27 communicates with the forward pipe 22 side, and in step 55, the hot water in the hot water storage tank 1 and the water supplied from the second water supply bypass pipe 10 are supplied by the bath mixing valve 8 so that the lower set temperature is reached. In step 56, the hot water solenoid valve 13 is opened, and the hot water filling circuit 11 is circulated from the hot water filling circuit 11 to the return pipe 21 of the bath circulation circuit 17. One of the return pipes 21 returns immediately from the three-way valve 26. The hot water that is filled in a low-temperature bathtub and flows from the other return pipe 21 to the bypass three-way valve 29 side passes the bypass three-way valve 29 through the bath heat exchanger 20 and the bypass passage 28 in step 57. By switching to the side, the hot water at a low set temperature is heated by exchanging heat with the hot water stored in the upper part of the hot water storage tank 1 by the bath heat exchanger 20, and the high temperature is set by the forward temperature sensor 46. The hot water from the bypass passage 28 is mixed with the hot water from the bypass pipe 28 and the hot water from the forward pipe 22 goes through the three-way valve 27 to fill the hot water in the bathtub having the higher preset temperature.

The bath mixing valve 8 mixes the mixture with a low set temperature and fills it with water. However, the low set temperature bath is filled with water as it is, but the high set temperature bath is heated through the bath heat exchanger 20 while filling with water. Therefore, even if the set temperature of the hot water is different between the two bathtubs 18 and 19, the hot water can be heated up efficiently in a short time with the hot water at the set temperature. It is very easy to use and can be used with peace of mind.
The hot water filling operation is terminated when the return three-way valve 26 is switched and the water level sensor 25 detects the set water levels of the first bathtub 18 and the second bathtub 19.

  Next, the reheating operation of the first bathtub 18 will be described with reference to the flowchart of FIG. 4. When the first remote controller 31 instructs the reheating of the first bathtub 18 in step 58, the process proceeds to step 59 and the remaining hot water returns to the three directions. The valve 34 is switched so that the second bathtub 19 and the remaining hot water heat exchanger 33 communicate with each other, and the remaining hot water forward three-way valve 35 is switched so that the second bathtub 19 and the remaining hot water heat exchanger 33 communicate with each other. The hot water circulation pump 38 is driven to check the presence or absence of remaining hot water, and the process proceeds to step 60 where the remaining hot water temperature in the second bathtub 19 is detected by the remaining hot water temperature sensor 37, and the remaining hot water temperature in the second bathtub 19 is determined. Here, it is determined whether it is higher than the remaining hot water temperature of the first bath 18 by + 5 ° C. or higher. If YES, the process proceeds to step 61 and the remaining hot water circulation pump 38 is turned on to use the remaining hot water heat of the second bath 19. Continue driving, then return in step 62 When the three-way valve 26 and the forward three-way valve 27 are switched so that the first bathtub 18 and the bath circulation circuit 17 communicate with each other and the bath circulation pump 24 is driven, the bath water in the first bathtub 18 is returned from the three-way valve 26. It flows into the remaining hot water heat exchanger 33, where it is heated by exchanging heat with the remaining hot water in the second bathtub 19 circulating through the remaining hot water passage 36, and then flows through the bath heat exchanger 20 to enter the hot water storage tank 1. The temperature is raised by exchanging heat with the high-temperature water at the top, and the circulation returned to the first bathtub 18 through the forward three-way valve 27 is sequentially repeated, so that the water is repulsed by the set-temperature bath water. When the bath water temperature of the first bath 18 becomes equal to or higher than the remaining hot water temperature of the second bath 19 + 5 ° C., the remaining hot water circulation pump 38 is automatically stopped to prevent the first bath 18 from remaining hot water in the second bath 19. Heating of bath water is stopped.

  Thereby, at the time of reheating operation of the 1st bathtub 18, when there is remaining hot water in the 2nd bathtub 19 which is other bathtubs, and a predetermined temperature is higher than the remaining hot water of the 1st bathtub 18, the remaining hot water heat exchanger 33 is changed. By using the remaining hot water calorie of the second bathtub 19 to the remaining hot water of the first bathtub 18 by using it, the waste of the calorie is prevented as much as possible, and an efficient operation can be performed. .

  Next, the reheating operation of the second bathtub 19 will be described with reference to the flowchart of FIG. 5. When the second remote control 32 instructs the reheating of the second bathtub 19 in step 63, the process proceeds to step 64 and the remaining hot water returns to the three directions. The valve 34 is switched so that the first bathtub 18 and the remaining hot water heat exchanger 33 communicate with each other, and the remaining hot water forward three-way valve 35 is switched so that the first bathtub 18 and the remaining hot water heat exchanger 33 communicate with each other. The hot water circulation pump 38 is driven to check the presence or absence of remaining hot water, and the routine proceeds to step 65 where the remaining hot water temperature in the first bathtub 18 is detected by the remaining hot water temperature sensor 37, and the remaining hot water temperature in the first bathtub 18 is detected. Here, it is determined whether the temperature is higher than the remaining hot water temperature before the second bath 19 is reheated or + 5 ° C., and if YES, the process proceeds to step 66 and the remaining hot water circulation pump 38 is turned on in order to use the remaining hot water heat of the first bath 18. Continue driving, then return at step 67 When the three-way valve 26 and the forward three-way valve 27 are switched so that the second bathtub 19 and the bath circulation circuit 17 communicate with each other and the bath circulation pump 24 is driven, the bath water in the second bathtub 19 is returned from the three-way valve 26. It flows into the remaining hot water heat exchanger 33, where it is heated by exchanging heat with the remaining hot water in the first bathtub 18 circulating in the remaining hot water passage 36, and then flows through the bath heat exchanger 20 to enter the hot water storage tank 1. The temperature is raised by exchanging heat with the high-temperature water at the upper part, and the circulation returned to the second bathtub 19 through the forward three-way valve 27 is sequentially repeated, so that it is repelled by the set-temperature bath water. When the bath water temperature in the second bath 19 becomes equal to or higher than the remaining hot water temperature of the first bath 18 + 5 ° C., the remaining hot water circulation pump 38 is automatically stopped to prevent the second bath 19 from remaining hot water in the first bath 18. Heating of bath water is stopped.

  Thus, when the second bathtub 19 is reheated, there is residual hot water in the first bathtub 18 and the remaining hot water temperature is higher than the remaining hot water temperature of the second bathtub 19 by reheating. The amount of remaining hot water in the first bath 18 is also used as the amount of heat for heating the hot water in the second bath 19 so that efficient and efficient reheating operation can be performed.

8 Bath mixing valve 11 Hot water filling circuit 17 Bath circulation circuit 18 First bath 19 Second bath 20 Bath mixing valve 21 Return pipe 22 Outward pipe 26 Return three-way valve 27 Outward three-way valve 30 Control circuit 33 Remaining hot water heat exchanger 34 Remaining hot water Return three-way valve 35 Remaining hot water going three-way valve 36 Remaining hot water passage 37 Remaining hot water temperature sensor 38 Remaining hot water circulation pump

Claims (2)

  A hot water storage tank for storing hot water heated by the heating means, a bath heat exchanger provided in the upper part of the hot water storage tank for heating the bath water by heat exchange with the hot water storage, and a bath connected to the bath heat exchanger A bath circulation circuit comprising a return pipe and a return pipe provided with a circulation pump, a first bathtub and a second bathtub connected to the bath circulation circuit via a three-way valve and a forward three-way valve, and the return three-way valve Provided with a control circuit for switching the flow path of the three-way valve, wherein the bath circulation circuit can individually reheat the first bath and the second bath. When the temperature of the remaining hot water of the other bathtub is higher than the temperature of the bath water to be reheated at the time of reheating one of the bathtubs, the remaining water heat exchanger absorbs heat from the remaining hot water. A bathing device characterized by reluctance.   The remaining hot water heat exchanger includes a return pipe connecting the return three-way valve and the bath circulation pump, a remaining hot water return three-way valve connected in parallel with the return three-way valve, and a remaining hot water forward three-way connected in parallel with the forward three-way valve. 2. The bath according to claim 1, wherein the remaining hot water passage connecting the valve is integrally formed, and the remaining hot water passage on the inlet side of the remaining hot water heat exchanger is provided with a remaining hot water temperature sensor. apparatus.

Images