JP5878857B2 - Hot water storage bath system - Google Patents

Description

  The present invention relates to a hot water storage bath apparatus that prevents freezing of a bath circulation circuit.

  Conventionally, in this kind of thing, at the risk of freezing, the bath circulation pump is driven to the minimum and the bath water in the bath circulation circuit is circulated to prevent freezing. Since it circulates to the bath heat exchanger in the hot water storage tank, it has a problem that the hot water temperature of the hot water tank gradually decreases. To prevent this, the bath heat exchanger has a bath heat exchanger. Bath heat exchange bypass pipe that bypasses the flow path and a bath switching valve that switches the flow path, and during freeze prevention operation, the flow path is switched and the circulating water circulates not in the bath heat exchanger but in the bath heat exchange bypass pipe By doing so, it was possible to prevent freezing without lowering the temperature of the hot water storage. (See Patent Document 1.)

JP 2003-50048 A

  By the way, in this conventional type, during the freeze prevention operation, the bath switching valve was switched to the bath heat exchange bypass pipe side so that the circulating water circulated through the bath heat exchange bypass pipe instead of the bath heat exchanger. In the bath circulation circuit from the changeover valve to the bath heat exchanger bypass pipe through the bath heat exchanger, the water in the pipe is not frozen before and after the bath heat exchanger due to the heat from the bath heat exchanger. The water in the pipe in the vicinity of the bath switching valve of the pipe from the bath switching valve to the bath heat exchanger does not circulate, and heat from the bath heat exchanger may not be transmitted, which may freeze.

  In order to solve the above-mentioned problem by focusing attention on this point, the present invention particularly has a configuration according to claim 1 in which a hot water storage tank for storing hot water, heating means for heating the hot water in the hot water storage tank, and the hot water storage tank are provided. A bath heat exchanger for exchanging heat with hot water, a bath circulation circuit for communicating the bath heat exchanger and the bathtub, and circulating the bath water provided in the bath circulation circuit to the bath heat exchanger A bath heat exchange bypass pipe that bypasses the bath heat exchanger and a bath heat exchange bypass pipe that circulates in the bath circulation pump, the bath circulation circuit between the bath circulation pump and the bath heat exchanger A bath switching valve that switches whether to circulate the bath heat exchanger, an outside air temperature sensor that detects an outside air temperature, and a control unit that performs an anti-freezing operation when the outside air temperature sensor detects a freezing danger temperature. , Anti-freezing luck Sometimes the bath circulation pump is intermittently operated for a predetermined time ON and OFF for a predetermined time, and a bath switching valve is connected so that the bath circulation pump communicates with the bath heat exchanger bypass pipe for a predetermined time when the bath circulation pump is ON for a predetermined time. In the hot water storage bath apparatus to be opened, the control means switches the bath switching valve to the bath heat exchanger side for a predetermined time while the bath circulation pump is turned OFF for a predetermined time during the freeze prevention operation, and the predetermined time has elapsed. The rear bath switching valve is switched again to the bath heat exchanger bypass pipe side.

  According to a second aspect of the present invention, the control means controls the switching time or the number of switching times for switching the bath switching valve to the bath heat exchanger side for a predetermined time while the bath circulation pump is turned OFF for a predetermined time during the freeze prevention operation. Is set by the outside air temperature detected by the outside air temperature sensor.

  According to the first aspect of the present invention, during the freeze prevention operation of the bath circulation circuit, the bath circulation pump is intermittently operated for a predetermined time ON and for a predetermined time OFF, and the bath circulation pump is operated for a predetermined time when the bath circulation pump is ON for a predetermined time. Open the bath switching valve so that the circulation pump communicates with the bath heat exchanger bypass pipe, and while the bath circulation pump is turned off for a predetermined time during freeze prevention operation, turn the bath switching valve on the side of the bath heat exchanger for a predetermined time Since the bath switching valve is switched to the bath heat exchanger bypass pipe again after a predetermined time has elapsed, the bath circulation circuit from the bathtub to the bathtub via the bath heat exchanger bypass pipe is prevented from freezing when the bath circulation pump is ON. When the bath circulation pump is OFF, the hot water in the pipe on the bath heat exchanger side of the bath switching valve and the hot water in the pipe on the bathtub side of the bath switching valve cause natural convection, and the inside of the pipe near the bath switching valve The temperature of the water rises, thereby freezing the hot water in the pipe on the bath heat exchanger side of the bath switching valve without consuming electric power by driving the bath circulation pump or using hot water heat in the hot water storage tank This can prevent the entire bath circulation circuit from freezing.

  According to the second aspect of the present invention, the control switching time or the number of times of switching for switching the bath switching valve to the bath heat exchanger side for a predetermined time while the bath circulation pump is turned OFF for a predetermined time during the freeze prevention operation is excluded. Since it is set according to the outside air temperature detected by the temperature sensor, when the outside air temperature is low and the possibility of freezing is high, the hot water in the pipe on the bath heat exchanger side of the bath switching valve and the pipe on the bathtub side of the bath switching valve It is possible to prevent the freezing of hot water in the pipe on the bath heat exchanger side of the bath switching valve by increasing the time for natural convection with hot water.

The schematic block diagram of one Embodiment of this invention. The flowchart figure of the freezing prevention driving | operation. Explanatory drawing which shows the state by which the bath switching valve is the bath heat exchanger side by the circulation pump OFF in the freeze prevention operation.

Next, an embodiment of the present invention will be described based on a hot water storage bath apparatus illustrated in the drawings.
1 is a hot water storage tank for storing hot water, 2 is a water supply pipe for supplying water to the hot water storage tank 1, 3 is a pressure reducing valve provided in the water supply pipe 2 for reducing the supply water pressure, 4 is a hot water discharge pipe for discharging hot water from the upper part of the hot water storage tank 1, An overpressure relief valve provided in the tapping pipe 4 for relieving overpressure, 6 is a feed water bypass pipe branched from the feed water pipe 2 on the downstream side of the pressure reducing valve 3, and 7 is hot water from the tapping pipe 4 and water from the feed water bypass pipe 6. , 8 is a hot water supply pipe for supplying hot water from the hot water supply mixing valve 7, 9 is a hot water temperature sensor provided in the hot water supply pipe 8, and 10 is a hot water flow rate sensor provided in the hot water supply pipe 8, 11 Are a plurality of hot water storage temperature sensors provided on the upper and lower sides of the hot water storage tank 1 for detecting the hot water storage temperature, 12 is a hot water temperature sensor for detecting the hot water temperature, and 13 is a hot water tap.

Reference numeral 14 is a bathtub, 15 is a bath heat exchanger (corresponding to a heat source for heating the bath water) provided in the upper part of the hot water storage tank 1, and 16 is connected to the bathtub 14 and the bath heat exchanger 15 so that the bath water can circulate. 17 is a bath circulation pump provided in the middle of the bath circulation circuit 16, and 18 is a bath heat exchanger branched from the upstream side of the bath heat exchanger 15 and the downstream side of the bath circulation pump 17 of the bath circulation circuit 16. 15 is a bath heat exchanger bypass pipe connected to the downstream side, 19 is a bath switching valve for switching whether the bath water is circulated to the bath heat exchanger 15 or the bath heat exchanger bypass pipe 18, and 20 is a bath heat exchanger from the bathtub 14 Bath temperature sensor for detecting the temperature of the bath water returning to the vessel 15, 21 is a hot water pipe branched from the hot water supply pipe 8 and connected to the bath circulation circuit 16, and 22 is a hot water solenoid valve for opening and closing the hot water pipe 21. It is.
Here, the bath circulation circuit 16, the bath heat exchanger bypass pipe 18, and the bath switching valve 19 constitute switching means for switching the heat source between the operating state and the non-operating state.

  23 is a compressor for compressing the refrigerant, 24 is a hot water supply heat exchanger for exchanging heat between the refrigerant and hot water, 25 is a pressure reducing means for depressurizing the refrigerant, 26 is an air heat exchanger as an evaporator for evaporating the low-temperature refrigerant, and 27 is A blower fan that blows outside air to the air heat exchanger 26. The compressor 23, the hot water supply heat exchanger 24, the decompression means 25, and the air heat exchanger 26 are connected in a ring shape with a refrigerant pipe 28, The heat pump heating means 29 which boils hot water is comprised.

  A heating circulation circuit 30 connects the lower part of the hot water storage tank 1 and the inlet of the hot water supply heat exchanger 24, connects the outlet of the hot water supply heat exchanger 24 and the upper part of the hot water storage tank 1, and 31 is the inlet side of the hot water supply heat exchanger 24 A heating circulation pump provided in the heating circulation circuit 30 for circulating hot water extracted from the lower part of the hot water storage tank 1 to the upper part of the hot water storage tank 1 through the hot water supply heat exchanger 24, and 32 indicates the temperature of the hot water flowing into the hot water supply heat exchanger 24. An incoming water temperature sensor 33 to detect, a boiling temperature sensor 33 to detect the temperature of hot water flowing out from the hot water supply heat exchanger 24, and an outside air temperature sensor 34 to detect the outside air temperature.

  Reference numeral 35 denotes a remote controller for performing hot water supply temperature and various necessary settings, a display unit 36 for displaying hot water set temperature and bath set temperature, a temperature setting switch 37 for setting hot water set temperature and bath set temperature, and bathtub 14. A flow switch 38 for performing a heat retaining operation for a predetermined heat retaining time following the filling of a predetermined amount of hot water to the water, a reheating switch 39 for performing a reheating operation for heating the bath water, and a water pouring operation for the bathtub 14 A water supply switch 40 is provided.

  Reference numeral 41 denotes a control means for controlling the operation of the hot water storage bath water heater, which stores a program for controlling the operation in advance and has a clock function with calculation, comparison, storage function, calendar function, Values detected by the sensor 9, the hot water supply flow rate sensor 10, the hot water storage temperature sensor 11, the water supply temperature sensor 12, the bath temperature sensor 20, the incoming water temperature sensor 32, the boiling temperature sensor 33, and the outside air temperature sensor 34 are input. Controls the drive of the mixing valve 7, bath circulation pump 17, bath switching valve 19, hot water solenoid valve 22, compressor 23, decompression means 25, blower fan 27, and heating circulation pump 31, and can communicate with the remote controller 35. The hot water supply operation, bath filling operation and heat insulation operation, reheating operation, hot water boiling operation in the hot water storage tank 1 and freezing prevention operation are all connected. It performs control of the operation.

  Reference numeral 42 denotes a bath flow sensor that detects the presence or absence of residual water in the bathtub 14.

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 storage tank 1 is boiled by the heat pump heating means 29 by the heating circuit 30 and the hot water is returned to the upper part of the hot water storage tank 1 and this circulation is repeated sequentially at 23:00 pm The hot water is stored in the entire hot water storage tank 1 by 7 am 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 hot water supply bypass pipe 6 by the hot water supply mixing valve 7 and used for hot water supply as hot water at the hot water supply set temperature. is there.

  Next, when performing hot water supply such as hot water filling, the remote controller 35 instructs the hot water filling to open the hot water solenoid valve 22, and the hot water temperature detected by the hot water temperature sensor 9 is controlled by the remote controller 35. The flow rate integrated value after opening the hot water solenoid valve 22 detected by the hot water supply flow rate sensor 10 is adjusted by adjusting the opening of the hot water supply mixing valve 10 so that the set hot bath temperature is reached. Reaches a predetermined amount of hot water set in advance by the remote controller 35 or the like, the hot water solenoid valve 22 is closed.

  Then, the bath switching pump 19 is driven with the bath switching valve 19 in the state of the bath heat exchanger bypass pipe 18, and if the bath water temperature detected by the bath temperature sensor 20 is lower than the bath set temperature, the bath switching valve 19 is bath-exchanged. When the bath water is heated as the state of the vessel 15 and a temperature equal to or higher than the bath set temperature is detected, the bath circulation pump 17 is stopped to complete the hot water filling operation.

Next, the freeze prevention operation of the bath circulation circuit 16 will be described with reference to the flowchart of FIG.
First, the control means 41 confirms whether or not the outside air temperature detected by the outside air temperature sensor 34 is equal to or lower than the freeze prevention operation start temperature (2 ° C. is set in this embodiment) (S1), and the outside air temperature starts the freeze prevention operation. When the temperature is lower than the temperature, the control unit 41 confirms the presence or absence of residual water in the bathtub 14 by the bath flow sensor 42 (S2), and when there is no residual water, determines that there is no hot water in the bath circulation circuit 16 as a whole. The remaining water freezing prevention operation of the circulation pump 17 is performed (S3). When there is remaining water, it is determined that there is hot water in the entire bath circulation circuit 16, and the freezing prevention operation of the bath circulation circuit 16 is started. (S4)

Then, the control means 41 first sets the bath switching valve 19 to the state of the bath heat exchange bypass pipe 18 (S5), and then drives the bath circulation pump 17. (S6)
As a result, hot water in the bath circulation circuit 16 is poured to prevent freezing.

Then, the control means 41 stops the bath circulation pump 17 when a predetermined time elapses after the bath circulation pump 17 is driven (S7). (S8)
Then, the control means 41 sets a switching time for keeping the bath switching valve 19 in the state of the bath heat exchanger 15 according to the outside air temperature detected by the air temperature sensor 34 (S9), and sets the bath switching valve 19 to the bath heat exchanger. Switch from the bypass pipe 18 side to the bath heat exchanger 15 side. (S10)

  At this time, the hot water in the pipe on the side of the bath heat exchanger 15 from the bath switching valve 19 is lower in temperature than the hot water in the pipe on the side of the bathtub 14 from the bath switching valve 19, so that the bath heat exchanger 15 side as shown in FIG. The hot water in the pipe passes through the bath switching valve 19 and flows into the pipe on the bathtub 14 side, and at the same time, the hot water in the pipe on the bathtub 14 flows through the bath switching valve 19 and flows into the pipe on the bath heat exchanger 15 side. It is.

  In this way, the hot water in the pipe on the bath heat exchanger 15 side of the bath switching valve 19 and the hot water in the pipe on the bathtub 14 side cause natural convection of hot water in the pipe on the bath heat exchanger 15 side of the bath switching valve 19. As a result, the temperature rises, and freezing of hot water in the pipe on the bath heat exchanger 15 side of the bath switching valve 19 can be prevented.

  When the predetermined time has elapsed after switching the bath switching valve 19 from the bath heat exchanger bypass pipe 18 side to the bath heat exchanger 15 side in (S10) (S11), the control means 41 switches the bath switching valve 19 to the bath heat exchanger. It switches from the container 15 side to the bath heat exchanger bypass pipe 18 side. (S12)

  Then, the control means 41 confirms whether or not a predetermined time has elapsed since the bath circulation pump 17 was stopped in (S8) (S13), and when the predetermined time has elapsed, performs the freeze prevention operation of the bath circulation circuit 16. In order to determine whether or not to end, it is confirmed whether or not the outside temperature detected by the outside temperature sensor 34 is higher than the freeze prevention operation start temperature. (S14)

  Then, when the outside air temperature is higher than the freeze prevention operation start temperature, the freeze prevention operation of the bath circulation circuit 16 is finished (S15), and when the outside air temperature is equal to or lower than the freeze prevention operation start temperature, the process returns to (S1).

  In the vicinity of the bath heat exchanger 15 in the bath circulation circuit 16, heat from the bath heat exchanger 15 is transmitted to prevent freezing, and in the bath circulation circuit 16, bath heat exchange with the tube from the bath heat exchanger 15 is performed. In the vicinity where the bypass pipe 18 is connected, the pipe from the bath heat exchanger 15 and the bath heat exchange bypass pipe 18 are always in communication, so even when the bath circulation pump 17 is stopped, the bath heat exchanger The hot water in the pipe from 15 and the hot water in the pipe of the bath heat exchanger bypass pipe 18 cause natural convection, and the temperature of the hot water in the pipe from the bath heat exchanger 15 rises to prevent freezing.

  As described above, in the freeze prevention operation of the bath circulation circuit 16, the bath switching valve 19 is set to the side of the bath heat exchanger bypass pipe 18 and the bath circulation pump 17 is driven to circulate hot water in the bath circulation circuit 16. Hot water in the bath heat exchanger 15 does not circulate during operation, and the bath circulation circuit 16 can be prevented from freezing without using the heat of the hot water in the hot water storage tank 1.

  Further, in order to perform the freeze prevention operation of the bath circulation circuit 16 with the bath switching valve 19 on the side of the bath heat exchanger bypass pipe 18, the bath switching valve 19 in the bath circulation circuit 16 from the bath switching valve 19 to the bath heat exchanger 15 is used. The hot water in the nearby pipes may be frozen due to a drop in temperature, but when the bath circulation pump 17 is stopped by the freeze prevention operation of the bath circulation circuit 16, the bath switching valve 19 is connected from the bath heat exchange bypass pipe 18 side. Since it is switched to the bath heat exchanger 15 side for a predetermined time, the hot water in the pipe on the bath heat exchanger 15 side of the bath switching valve 19 and the hot water in the pipe on the bathtub 14 side of the bath switching valve 19 cause natural convection and take a bath. The temperature of the hot water in the pipe in the vicinity of the switching valve 19 rises, so that the bath heat of the bath switching valve 19 can be obtained without consuming electric power by driving the bath circulation pump 17 or using high-temperature water heat in the hot water storage tank 1. Exchange 15 side can hot water freeze prevention pipe, is capable of performing bath circulation circuit 16 whole antifreeze.

DESCRIPTION OF SYMBOLS 1 Hot water storage tank 29 Heating means 15 Bath heat exchanger 14 Bath 16 Bath circulation circuit 17 Bath circulation pump 18 Bath heat exchanger bypass pipe 19 Bath switching valve 34 Outside temperature sensor 41 Control means

Claims (2)

  A hot water storage tank for storing hot water, heating means for heating the hot water in the hot water storage tank, a bath heat exchanger provided in the hot water storage tank for exchanging heat with hot water, and the bath heat exchanger and the bathtub communicate with each other. A bath circulation circuit, a bath circulation pump that is provided in the bath circulation circuit and circulates the bath water in the bath heat exchanger to reheat, and a bath circulation circuit between the bath circulation pump and the bath heat exchanger, A bath heat exchanger bypass pipe that bypasses the bath heat exchanger, a bath switching valve that switches between circulating the bath heat exchanger bypass pipe or the bath heat exchanger in the bath circulation circuit, and an outside that detects the outside air temperature A temperature sensor and a control means for performing an anti-freezing operation when the outside air temperature sensor detects a risk of freezing, and during the anti-freezing operation, the bath circulation pump is intermittently operated for a predetermined time and OFF for a predetermined time. In addition, in the hot water storage type bath apparatus that opens the bath switching valve so that the bath circulation pump communicates with the bath heat exchanger bypass pipe for a predetermined time when the bath circulation pump is turned on for a predetermined time, the control means is configured to perform the freeze prevention operation. While the bath circulation pump is turned off for a predetermined time, the bath switching valve is switched to the bath heat exchanger side for a predetermined time, and the bath switching valve is switched to the bath heat exchanger bypass pipe side again after the predetermined time has elapsed. Hot water storage bath system. While the bath circulation pump is turned off for a predetermined time during the freeze prevention operation, the control means detects the switching time or the number of times of switching for switching the bath switching valve to the bath heat exchanger side for a predetermined time. The hot water storage bath apparatus according to claim 1, wherein the hot water bath apparatus is set according to an outside air temperature.

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