JP6078786B2 - Water heater - Google Patents

Description

  The present invention relates to a hot water supply apparatus.

  Conventionally, in this type of hot water supply device, when the outside air temperature is detected and the detected temperature falls below a predetermined temperature, the circulation pump of the bathtub circulation path is activated to prevent freezing so that the water in the bathtub circulation path does not freeze. The control specification freeze prevention operation is performed to determine whether to stop the circulation pump according to the detected temperature of the circulating water after a certain time operation, or to continue the freeze prevention operation for a certain time (for example, Patent Document 1).

JP-A-5-187713

  However, in the conventional configuration, the circulation pump is stopped for a certain time at the end of the freeze-preventing operation, but if the stop time is made constant regardless of the outside air temperature, the stopping time is set to prevent freezing even when the outside air temperature is low. Although it is necessary to set it short and it is not necessary when the outside air temperature is not low, there has been a problem of frequent freeze prevention operation.

  Further, when the outside air temperature rapidly decreases while the circulation pump is stopped, there is a problem that the water in the bathtub circulation path may be frozen before the next freeze prevention is started.

  The present invention solves the above-mentioned conventional problem, and changes the stop time of the operation to prevent water in the bathtub circuit from freezing based on the outside air temperature, thereby freezing the water in the bathtub circuit. An object of the present invention is to provide a hot water supply device with improved prevention performance.

In order to solve the conventional problems, a hot water supply apparatus of the present invention includes a hot water storage tank, a bathtub, a heat exchanger in which hot water in the hot water tank and hot water in the bathtub exchange heat, and the heat exchanger. A bathtub circulation path connected to circulate hot water in the bathtub, a circulation pump for circulating hot water in the bathtub to the bathtub circulation path, an outside air temperature detecting means for detecting an outside air temperature, and the bathtub circulation An operation mode for driving the circulation pump based on the temperature detected by the outside air temperature detecting means and a control device are provided so that water in the road does not freeze, and until the operation mode is stopped and restarted. When the control device changes the stop time based on the detected temperature of the outside air temperature detecting means, and the detected temperature of the outside air temperature detecting means changes when the operation mode is stopped, the detection after the change is detected. Based on temperature , It is characterized in changing the stop time.

  This provides a hot water supply device that improves the prevention of water freezing in the bathtub circulation path by changing the operation stop time to prevent the water in the bathtub circulation path from freezing based on the outside air temperature. it can.

In addition, this prevents the outside air temperature from dropping rapidly while the operation mode for driving the circulation pump is stopped for a certain period of time based on the detected temperature of the outside air temperature detecting means so that the water in the bathtub circulation path does not freeze. Then, it is possible to prevent water in the bathtub circulation path from being frozen before the next operation mode is activated.

  ADVANTAGE OF THE INVENTION According to this invention, the hot water supply which improved the prevention performance of the water freezing in a bathtub circulation path by changing the stop time of the operation performed so that the water in a bathtub circulation path may not freeze based on external temperature Equipment can be provided.

Configuration diagram of hot water supply apparatus in Embodiment 1 of the present invention Relationship diagram between outside air temperature and freeze prevention operation stop time of the freeze prevention operation Relationship diagram between outside temperature and freeze prevention operation stop time of other freeze prevention operations Relationship diagram between outside temperature and freeze prevention operation stop time of other freeze prevention operations Control chart for other freeze prevention operations

In a first aspect of the present invention, a hot water tank, a bathtub, a hot water in the hot water tank and a hot water in the bathtub, and a hot water in the bathtub circulate in the heat exchanger. A connected bathtub circulation path, a circulation pump for circulating hot water in the bathtub to the bathtub circulation path, an outside air temperature detecting means for detecting an outside air temperature, and the water in the bathtub circulation path so as not to freeze. An operation mode for driving the circulation pump based on the temperature detected by the outside air temperature detection means; and a control device, wherein the control device indicates a stop time from when the operation mode is stopped until the operation is restarted. While changing based on the detected temperature of the temperature detecting means, and when the detected temperature of the outside air temperature detecting means is changed when the operation mode is stopped, the stop time is changed based on the detected temperature after the change. With features That is a hot water supply apparatus.

This provides a hot water supply device that improves the prevention of water freezing in the bathtub circulation path by changing the operation stop time to prevent the water in the bathtub circulation path from freezing based on the outside air temperature. it can.

Further, by this, as the water in the bathtub circulation path is not frozen, while stopping the operation mode for driving the circulation pump based on the detected temperature of the outside air temperature detection means a predetermined time, the outside air temperature is rapidly When it falls, it can prevent freezing of the water in a bathtub circuit before the next operation mode starts.

  Hereinafter, embodiments of the present invention will be described with reference to the drawings. Note that the present invention is not limited to the embodiments.

(Embodiment 1)
FIG. 1 is a configuration diagram of a hot water storage type hot water heater having a bath replenishment function according to the first embodiment.

  In FIG. 1, the hot water storage type hot water supply apparatus of the present embodiment includes a tank unit 1 and a heat pump unit 2, and heat pump unit 2 stores hot water stored in a hot water storage tank 3 disposed in the tank unit 1. It is generated by. Moreover, the solid line arrow has shown the direction through which the fluid flows.

  Next, the configuration of the heat pump unit 2 will be described. The heat pump unit 2 is configured by sequentially connecting a water-refrigerant heat exchanger 24, a compressor 25, an evaporator 26, and an expansion valve 27 in an annular manner through a refrigerant pipe, and uses carbon dioxide as a refrigerant. Since the high pressure side exceeds the critical pressure, the water flowing through the water / refrigerant heat exchanger 24 is deprived of heat and does not condense even if the temperature is lowered. A difference is easily formed, high-temperature hot water can be obtained, and heat exchange efficiency can be increased. In addition, an outside air temperature detecting means 29 is provided to perform an appropriate operation according to the outside air temperature.

  Next, the configuration of the tank unit 1 will be described. The tank unit 1 has the hot water storage tank 3 as described above, and the water supply pipe 31 for supplying the low temperature water from the water supply source is connected to the bottom of the hot water storage tank 3 so that the water supply pressure is always kept in the tank. It is in a hanging state. In addition, a hot water discharge pipe 32 for discharging hot water in the hot water storage tank 3 is connected to an upper portion of the hot water storage tank 3 so that high temperature water can be supplied to a hot water supply terminal and a bathtub.

  Next, a hot water supply circuit for supplying hot water to the hot water supply terminal will be described.

  The hot water supply circuit in the present embodiment is configured such that hot water having a desired temperature can be generated by connecting the terminal water supply pipe 33 branched from the water supply pipe 31 and the hot water discharge pipe 32 with the electric mixing valve 4.

  The mixing ratio of the electric mixing valve 4 is changed so that the temperature detected by the temperature sensor 41 provided on the downstream side of the electric mixing valve 4 becomes the temperature set by the remote control device provided in the kitchen or bathroom. Is done. Then, the hot water mixed at a desired temperature is supplied to the hot water supply terminal 42.

  Next, a hot water filling circuit and a reheating circuit for the bathtub 5 will be described.

  In the present embodiment, the hot water in the bathtub 5 and the high-temperature water in the hot water tank 3 are reheated by the heat exchanger 6 to reheat the hot water in the bathtub. .

  Therefore, the high temperature side circuit of the reheating heat exchanger 6 is configured to be supplied with the high temperature water in the hot water storage tank 3, and is configured to return the hot water after heat exchange to the lower part of the hot water storage tank 3. Has been.

  Moreover, the low temperature side circuit of the reheating heat exchanger 6 is configured to be supplied with hot water in the bathtub 5, and is configured to return the bathtub water after the heat exchange to the bathtub 5 again. .

  In the high temperature side circuit, a temperature sensor 71 as a high temperature side outlet temperature detection means is disposed downstream of the reheating pump 7 and the reheating heat exchanger 6, and the reheating pump 7 is driven to drive the hot water storage tank. The hot water in 3 is conveyed to the reheating heat exchanger 6.

  And the adapter 51 of the bathtub 5 and the tank unit 1 are connected by the return connection pipe 61 and the forward connection pipe 62 in the connection parts 60a-60d.

  The return connection pipe 61 and the forward connection pipe 62 are connected to the reheating heat exchanger 6 by a return pipe 63 and a forward pipe 64, respectively. The bathtub 5, the return connection pipe 61, the return pipe 63, The reheating heat exchanger 6, the outgoing pipe 64, and the outgoing connecting pipe 62 are sequentially connected to form a bathtub circulation path.

  The hot water filling circuit for supplying hot water from the hot water storage tank 3 to the bathtub 5 includes a bath hot water supply pipe 34 branched from the hot water supply pipe 32 and a bath water supply pipe 35 branched from the water supply pipe 31 in the electric mixing valve 8. And hot water having a desired temperature can be generated.

  The mixing ratio of the electric mixing valve 8 is set so that the temperature detected by the temperature sensor 81 provided on the downstream side of the electric mixing valve 8 becomes the temperature set by the remote control device provided in the kitchen or bathroom. Be changed. Then, the hot water mixed at a desired temperature is supplied to the bathtub 5.

  Moreover, the flow rate sensor 82 is provided in the hot water filling circuit, and the amount of hot water supplied to the bathtub 5 is measured. Further, a two-way electromagnetic valve 83 is provided, and at the start of hot water filling, the supply of hot water to the bathtub 5 is started simultaneously with opening of the electromagnetic valve 83.

  After the electromagnetic valve 83 is opened, hot water filling is performed from two directions of the return pipe 63 and the forward pipe 64 to the bathtub 5. In addition, a check means 84 is provided for preventing the backflow of sewage.

  The return pipe 63 includes a circulation pump 65 that is a conveying means for circulating hot water in the bathtub 5, a water level sensor 66 that detects the water level in the bathtub 5, and a bath temperature that detects the temperature of hot water in the bathtub 5. A temperature sensor 67 as a detection means is provided, and when the circulation pump 65 is driven, hot water in the bathtub 5 is sucked into the return pipe 63 and flows into the forward pipe 64 via the reheating heat exchanger 6. It is returned to the bathtub 5 again.

  Also, a bath switch 68 is provided between the circulation pump 65 and the reheating heat exchanger 6 as hot water detection means for detecting whether hot water is present in the bathtub 5. Is configured to be detectable.

  That is, it is determined that there is hot water in the bathtub 5 when the bath switch 68 is turned on, and it is determined that there is no hot water in the bathtub 5 when the bath switch 68 is turned off.

  In addition, a remote control device 9 is installed in the bathroom, which is an operation means that can operate the hot water storage type hot water heater, and is a temperature setting means for setting the temperature of hot water in the bathtub 5, and the remote control device 9 is operated. Then, set the temperature of the hot water, fill the bath, and perform the trial run after installation.

  The remote control device 9 has a display unit 91 for displaying information and an operation unit 92 for performing operations. Although not shown in FIG. 1, the hot water storage type water heater of the present embodiment also includes a control device 94 that receives an instruction from the remote control device 9 and commands each control device. The control device 94 is composed of a microcomputer and its electronic control parts, and sends commands to the devices constituting the tank unit 1.

  Moreover, in this Embodiment, the temperature sensor 69 which is the reheating hot water temperature detection means which detects the temperature of the bath water after being heated with the reheating heat exchanger 6 is provided.

  This temperature sensor 69 detects the temperature of the hot water sent to the bathtub 5, and the reheating pump 7 is controlled so that the temperature detected by the temperature sensor 69 does not exceed the upper limit temperature.

  This is because the temperature sensor 69 can detect the temperature of the hot water supplied directly to the bathtub 5, so that hot water having a temperature higher than the upper limit temperature is not supplied to the bathtub 5 to prevent the bather from being burned. can do.

  In the hot water storage type water heater configured as described above, first, the hot water filling operation of the hot water storage type water heater will be described.

  When the user operates the remote control device 9 to start the hot water filling operation, or when the hot water filling operation is reserved in advance, the hot water filling operation is started at the set time. When the hot water filling operation is started, the electromagnetic valve 83 is opened, high temperature water from the hot water storage tank 3 is mixed by the electric mixing valve 8 so as to reach a set temperature, and supplied to the bathtub 5.

  Hot water discharged from the electric mixing valve 8 is branched in two directions, a return pipe 63 and an outgoing pipe 64, and hot water is supplied to the bathtub 5. Further, the amount of hot water filling is detected by the flow rate sensor 82, and when the set amount of hot water is detected by the flow rate sensor 82, the electromagnetic valve 83 is closed and the hot water filling operation is terminated.

  Note that the temperature of the hot water mixed by the electric mixing valve 8 during the hot water filling operation may be several degrees higher than the temperature of the hot water set by the remote control device 9.

  This is because the hot water mixed by the electric mixing valve 8 dissipates heat when flowing through the hot water supply pipe until it goes to the bathtub 5, and when the hot water is poured into the bathtub 5, the temperature may decrease. It is. For this reason, by setting the temperature of the hot water mixed by the electric mixing valve 8 to be higher than the set temperature, it is possible to perform a hot water filling operation in consideration of heat radiation in the piping.

  Next, the freeze prevention operation | movement which drives the circulation pump 65 is demonstrated so that the water in a bathtub circulation path may not freeze.

  When the bath-related operation such as automatic bath is stopped, the circulation pump 65 is driven when the detected temperature of the outside air temperature detecting means 29 detects the freeze prevention operation start determination temperature Ta or lower. After the circulation pump is driven, the state of the bath switch 68 is confirmed. If the on state continues, it is determined that there is water in the bathtub 5, and the temperature detected by the bath temperature sensor 67 is confirmed after a predetermined time has elapsed, and the freeze prevention operation is performed. If it is equal to or higher than the end determination temperature, the freeze prevention operation stop time until the next freeze prevention operation is determined is set and the freeze prevention operation is ended.

  When the temperature is lower than the freeze prevention operation end determination temperature, the reheating pump 7 is driven to heat the water in the bathtub. If the temperature detected by the bath temperature sensor 67 rises and becomes equal to or higher than the freeze prevention operation end determination temperature, the freeze prevention operation stop time until the next freeze prevention operation determination is set in the same manner, and the freeze prevention operation is ended. On the other hand, if the bath switch 68 does not continue to be turned on and is repeatedly turned on and off for a certain period of time or continues to be turned off, it is determined that there is no water in the bathtub, and the circulation pump 65 is prevented from freezing when there is no water in the bathtub 5. To drive.

  In this embodiment, the set time of the freeze prevention operation stop time until the next freeze prevention operation is determined is switched according to the temperature detected by the outside air temperature detection means 29 when the freeze prevention operation is started.

  FIG. 2 shows the relationship between the outside air temperature and the freeze prevention operation stop time when the freeze prevention operation stop time is switched according to the outside air temperature at the end of the freeze prevention operation. When the detected temperature of the outside air temperature detecting means detects the freeze prevention operation start determination temperature Ta ° C, the freeze prevention operation is started, and at the end of the freeze prevention operation, the freeze prevention operation stop time corresponding to the outside air temperature Tb ° C or more and Ta ° C or less is Δta minutes. Set.

  Since the outside air temperature is equal to or lower than the freeze prevention operation start determination temperature Ta ° C., the freeze prevention operation is started when the freeze prevention operation stop time Δta has elapsed.

  When the outside air temperature during the freeze prevention operation is equal to or higher than the freeze prevention operation stop time change threshold Tb ° C, when the freeze prevention stop time Δta minutes elapses, the freeze prevention operation is started until the freeze prevention operation is completed. The freeze prevention operation is repeatedly stopped for a stop time Δta.

  When the outside air temperature during the freeze prevention operation becomes less than the freeze prevention operation stop time change threshold Tb ° C., the freeze prevention stop time is switched to Δtb minutes and set at the end of the freeze prevention operation. When the freeze prevention stop time Δtb has elapsed, the freeze prevention operation is started until the freeze prevention operation is completed, and the freeze prevention operation is repeatedly stopped for the freeze prevention stop time Δtb.

  FIG. 3 shows the relationship between the outside air temperature and the freeze prevention operation stop time in the control for changing the freeze prevention operation stop time when the outside air temperature changes during the freeze prevention stop.

  When the outside air temperature is Tb ° C. or more and less than Ta ° C. and the freeze prevention operation ends, the freeze prevention operation stop time Δta is set. When the freeze prevention operation stop elapsed time t is t ≦ Δta and the outside air temperature is detected to be less than the freeze prevention operation stop time change threshold Tb ° C., the freeze prevention is prevented even if the freeze prevention operation stop time Δta has not elapsed. Clear operation stop time and start freeze prevention operation.

  At the end of the next freeze prevention operation, since the outside air temperature is lower than Tb ° C., Δtb is set as the freeze prevention stop time.

  In this case, the freeze prevention operation is started again when the outside air temperature becomes lower than Tb ° C. immediately after the freeze prevention operation stop time Δta is set and stopped. Therefore, a control method for resetting the stop time can also be performed.

  FIG. 4 shows the relationship between the outside air temperature and the freeze prevention operation stop time in the control for resetting the freeze prevention operation stop time when the outside air temperature changes during the freeze prevention stop.

  When the outside air temperature is Tb ° C. or more and less than Ta ° C. and the freeze prevention operation ends, the freeze prevention operation stop time Δta is set. When the outside air temperature is detected to be below the freezing prevention operation stop time change threshold Tb ° C. during the freeze prevention operation stop, if the freeze prevention operation stop elapsed time t is t ≦ Δta−Δtb, the freeze prevention operation stop time is set. Reset to Δtb, and the freeze prevention operation is performed after Δtb minutes after the outside air temperature becomes less than Tb ° C.

  When the freeze prevention operation stop elapsed time t is t> Δta−Δtb, the freeze prevention operation stop time is not reset. In this case, the temperature is less than Δtb until the outside air temperature becomes lower than Tb ° C. and the freeze prevention operation is performed, and the freezing does not occur.

  FIG. 5 shows a bath chart of the freeze prevention operation. The outside air temperature is determined in S1 and S2, and if the outside air temperature is higher than Ta, the freeze prevention operation is not performed. If Ta is equal to or less than Tb, the freeze prevention operation stop time Δta in S3 is set to freeze prevention operation 1. Transition. When the outside air temperature is lower than Tb, the process proceeds to the freeze prevention operation 2 in which the freeze prevention operation stop time Δtb of S11 is set.

  In the freeze prevention operation, the temperature of the bath Th for detecting the bath temperature is detected to be equal to or higher than the freeze prevention operation end determination temperature in S4 and S12, transition to the freeze prevention operation end in S5 and S13, and the freeze prevention operation in S6 and S14. Set the stop time. When the freeze prevention operation is stopped, timer counting of the freeze prevention operation stop elapsed time t is started in S7 and S15.

  When the freeze prevention operation stop time Δta is set, the change in the outside air temperature is detected until the freeze prevention operation stop elapsed time t becomes t> Δta−Δt, and the outside air temperature is less than Tb. If it becomes, it will change to S14 and reset freezing prevention driving | operation stop time to (DELTA) tb minutes.

  In the description of the above embodiment, the single freeze prevention operation stop time change threshold has been described. However, the freeze prevention operation stop time change threshold is increased by finely dividing the temperature so that the freeze prevention operation stop time is finely changed. You can also.

  As described above, the hot water supply apparatus according to the present invention changes the stop time of the operation performed so that the water in the bathtub circuit is not frozen based on the outside air temperature, thereby freezing the water in the bathtub circuit. Since the preventive performance can be improved, it can be applied to a hot water supply device having a bathtub circulation path.

DESCRIPTION OF SYMBOLS 3 Hot water tank 5 Bathtub 6 Reheating heat exchanger 7 Reheating pump 29 Outside temperature detection means 61 Return connection pipe 62 Outward connection pipe 63 Return piping 64 Outward piping 65 Circulation pump 94 Control apparatus

Claims (1)

A hot water tank, a bathtub, a heat exchanger for exchanging heat between the hot water in the hot water tank and the hot water in the bathtub, and a bathtub circuit connected to the heat exchanger so that the hot water in the bathtub circulates A circulating pump for circulating hot water in the bathtub to the bathtub circulation path, an outside air temperature detection means for detecting the outside air temperature, and detection of the outside air temperature detection means so that the water in the bathtub circulation path is not frozen. An operation mode for driving the circulation pump based on temperature, and a control device, wherein the control device indicates a detection temperature of the outside air temperature detection means after the operation mode is stopped until it is restarted. And when the detected temperature of the outside air temperature detecting means changes when the operation mode is stopped, the stop time is changed based on the detected temperature after the change. apparatus.