JP2009162415A - Hot water storage type water heater - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a hot water storage type water heater boiling up the hot water or water in a hot water storage tank to an optional boiling-up target temperature even in a state where the hot water storage tank is not filled up with the hot water or water because of water stoppage in disasters such as earthquake. <P>SOLUTION: This hot water storage type water heater comprises: a boiling-up control portion 33 for boiling up the hot water or water in the hot water storage tank 2 to the boiling-up target temperature by a heating means 3; and an abnormality detecting means 34 determining the abnormality and stops the boiling-up when one or both of temperatures detected by a boiling-up temperature detecting means 13 detecting a temperature of warm water heated by a heating heat exchanger 4 received in the heating means 3 and a hot water storage temperature detecting means 26 disposed at an upper portion of the hot water storage tank 2 are low temperature for a prescribed time in boiling-up. A disaster mode is provided to set the abnormality detecting means 34 invalid to perform the boiling-up, and the optional boiling-up target temperature is set by manually operating a remote controller 5 for controlling an operation of the hot water storage type water heater, when the disaster mode is selected. <P>COPYRIGHT: (C)2009,JPO&INPIT

Description

  The present invention relates to a hot water storage type hot water supply apparatus that can effectively use hot water in a hot water storage tank after a disaster such as an earthquake.

Conventionally, in this type of hot water storage hot water supply system, when an earthquake (pre-earthquake) has occurred and is detected, the target boiling temperature when boiling the hot water in the hot water storage tank with the heat pump unit is set to the hot water supply, bath, etc. In order to obtain hot water at a temperature that can be used directly as domestic water from a hot water storage tank, even if a main shock occurs after the earthquake and a water outage occurs, the temperature is set to a low temperature that can be used directly. There was something to do. (For example, refer to Patent Document 1.)
JP 2007-255753 A

  By the way, in this conventional system, the boiling target temperature is set to a low temperature in preparation for the mainshock after the pre-earthquake, and a power outage and water outage occurred due to the mainshock. No consideration has been given to boiling up when the plant is restored. When a power failure occurs due to the mainshock and when the water is shut off, the drain plug provided at the bottom of the hot water storage tank is opened and the hot water in the hot water storage tank is taken out and used as domestic water. The temperature of the hot water in the hot water storage tank decreases due to natural heat dissipation. In this state, when the electric power is restored and the hot water in the hot water tank is to be boiled, a plurality of hot water temperature sensors that are arranged in the vertical direction of the hot water tank and detect the temperature of the hot water hot water are arranged above the hot water tank. The hot water storage temperature sensor detects the temperature of the replaced air, and there is a possibility that the temperature detected by the hot water storage temperature sensor provided at the upper part of the hot water storage tank does not rise so much despite boiling. is there. Generally, if the temperature detected by the hot water storage temperature sensor located in the upper part of the hot water storage tank is low for a predetermined time, it is judged that the boiling has not been performed properly and the boiling is stopped due to an abnormal low temperature. Is done. For this reason, even if the electric power is restored, the hot water in the hot water storage tank cannot be boiled, and there is a problem that it is not possible to generate hot water that is used as domestic water.

  In general, when the boiling temperature sensor that detects the temperature of the hot water after being heated by the water-refrigerant heat exchanger that is the heating heat exchanger of the heat pump unit detects the low temperature for a predetermined time during the boiling, the boiling is not performed. It is judged that the heating is not performed properly, and the boiling is stopped when the boiling temperature is low. Therefore, if the boiling target temperature is set to a low temperature, the boiling will stop at the boiling temperature low temperature abnormality at the time of boiling, and even if power is restored in the same manner as described above, The hot water cannot be boiled, and there is a problem that hot water that can be used as domestic water cannot be generated.

  In order to solve the above-mentioned problems, the present invention is particularly configured as claimed in claim 1. The hot water storage tank for storing hot water, the heating means for heating the hot water in the hot water storage tank, and the heating means from the lower part of the hot water storage tank are provided. A forward pipe heading toward the heating heat exchanger housed therein, a circulation pump provided in the middle of the forward pipe for circulating hot water, a return pipe returning from the heating heat exchanger to the upper part of the hot water storage tank, and the return pipe A boiling temperature detection means for detecting the temperature of the hot water after being heated by the heating heat exchanger, and a hot water storage temperature detection means for detecting the temperature of the hot water storage temperature provided in a plurality in the vertical direction of the hot water storage tank; A boiling control unit for boiling hot water in the hot water storage tank to the boiling target temperature by the heating means, and the hot water storage unit disposed above the boiling temperature detecting means and the hot water storage tank at the time of boiling. If the temperature detected by either or both of the degree detection means is low for a predetermined time, the abnormality detection means is invalidated in a hot water storage type hot water supply apparatus having an abnormality detection means that judges that the temperature is abnormal and stops boiling. If the disaster mode is selected, the remote control for operating the hot water storage system is manually operated to set the desired boiling target temperature. It was supposed to be possible.

  According to claim 1 of the present invention, when the disaster mode is selected, at the time of boiling, any one of the boiling temperature detection means and the hot water storage temperature detection means disposed on the hot water storage tank, Alternatively, even if the temperature detected by both is low for a predetermined time, the abnormality detection means can be set to be invalid and boiling can be performed without judging the abnormality, so the upper part of the hot water storage tank described above is replaced with air. Even when boiling in the heated state or when the boiling target temperature is set to a low temperature, the hot water in the hot water storage tank can be boiled without being judged abnormal, and the water shutoff state continues Even when power is restored, hot water in the hot water storage tank can be boiled to generate hot water that you want to use as domestic water, and when the disaster mode is selected, Since the desired boiling target temperature can be set by manually operating the remote controller that performs the rolling operation, when the boiling target temperature is set to a low temperature, for example, about 40 ° C., the temperature that can be directly used for hot water supply, bath, etc. It is easy to use and can be used immediately after it has been taken out from the hot water storage tank. Boil the hot water in the hot water storage tank at a high temperature, for example, about 80 ° C, and put the hot water boiled at this high temperature and the water obtained from the water truck etc. into the plastic tank into a container such as a bucket. By mixing them together, it is possible to generate hot water at a temperature that can be used directly for hot water and baths, etc., and provide water for daily use such as hot water and baths while minimizing the consumption of hot water in hot water storage tanks. So on that, the user is capable of very effectively use the hot water in the hot water storage tank to arbitrarily set the target temperature boiling depending on the application.

Next, an embodiment of the hot water storage type hot water supply apparatus of the present invention will be described with reference to the drawings.
1 is a hot water storage tank unit having a hot water storage tank 2 for storing hot water, 3 is a heat pump unit as a heating means for heating the hot water in the hot water storage tank 2, and 4 is a heating heat exchanger housed in the heat pump unit 3. The water refrigerant heat exchanger 5 is a remote control for setting the hot water supply set temperature, manually setting various operation modes such as the full tank mode and forced boiling increase operation mode, and operating the hot water storage water heater. is there.

  The hot water storage tank 2 of the hot water storage tank unit 1 has a hot water discharge pipe 6 connected to the upper end, a water supply pipe 7 connected to the lower end, and a forward pipe 8 connected to the water refrigerant heat exchanger 4 in a circulatory manner at the bottom. A return pipe 9 is connected to the top. Further, a circulation pump 10 for circulating hot water in the hot water storage tank 2 to the heat pump unit 3 is provided in the middle of the outward pipe 8, and the heating circulation circuit is constituted by the outward pipe 8, the circulation pump 10, the water refrigerant heat exchanger 4, and the return pipe 9. 11 is constituted. Further, the forward pipe 8 and the return pipe 9 before and after the water-refrigerant heat exchanger 4 are respectively provided with an incoming water temperature sensor 12 and a boiling temperature sensor 13 as a boiling temperature detecting means.

  14 is a water supply bypass pipe that branches off from the water supply pipe 7 and bypasses the hot water storage tank 2, and 15 is a hot water supply mixture that mixes the hot water from the hot water discharge pipe 6 and the water from the water supply bypass pipe 14 into hot water at a hot water supply set temperature. Reference numeral 16 denotes a hot water supply pipe for supplying hot water mixed by the hot water supply mixing valve 15 to a hot water tap 17 provided in a kitchen or a bathroom, and 18 denotes a hot water supply mixing valve provided in a hot water supply pipe 16 immediately after the hot water supply mixing valve 15. 15 is a hot water temperature sensor for detecting the temperature of the hot water mixed at 15, and 19 is a flow rate counter for counting the amount of hot water to be supplied.

  The heat pump unit 3 includes the water-refrigerant heat exchanger 4 as a condenser, a variable-speed compressor 20 that compresses the refrigerant, an electronic expansion valve 21, and an air heat exchanger 22 as a forced air-cooled evaporator. The heat pump circuit 23, the outdoor fan 24 that blows air to the air heat exchanger 22, and a heat pump control unit 25 that controls the heat pump unit 3 are used. Carbon dioxide is used as a refrigerant in the heat pump circuit 23. This constitutes a supercritical heat pump cycle.

  A plurality of hot water storage temperature sensors 26 are provided in the vertical direction of the side surface of the hot water storage tank 2 to detect the temperature of the hot water storage hot water. In this embodiment, the hot water storage temperature sensors 26a, 26b, 26c, 26d, and 26e are arranged in order from the top. Two hot water storage temperature sensors 26 are arranged, the amount of heat remaining in the hot water storage tank 2 is detected based on temperature information detected by the hot water storage temperature sensor 26, and the temperature distribution in the vertical direction in the hot water storage tank 2 is determined. It is something to detect.

  The remote controller 5 includes a display unit 27 for displaying a set temperature, error information, and the like, a hot water supply temperature setting switch 28 for setting a hot water supply set temperature, a bath temperature setting switch 29 for setting a bath set temperature, and a hot water storage tank 2. The operation mode for boiling hot water with the heat pump unit 3 is selected and operated, and various operation modes, for example, a full tank mode in which a large amount of hot water is stored in the hot water storage tank 2, a past hot water amount Omakase mode that wants to store hot water according to performance, only midnight mode that heats up only during low-night hours when electricity is inexpensive, and can set the target temperature for boiling hot water in hot water tank 2 at any time during a disaster The operation mode selection switch 30 for selecting one of the modes, and the amount of increase in boiling hot water in the hot water storage tank 2 are “full” and “100 L”. Or in which the reheating switch 31 for causing the selected additional boiling operation switches manually as "50L" are provided.

  Reference numeral 32 denotes a hot water storage control unit having a microcomputer for controlling the driving start / stop of the heat pump unit 3 and the input of various sensors to control the driving of each actuator. The hot water supply set temperature and the like can be set, and connected to the heat-pump control unit 25 so as to be communicable with each other by wire, so that the boiling-up target temperature and the instruction for starting and stopping the heating operation are sent to the heat-pone control unit 25. Is.

  The hot water storage control unit 32 includes a boiling control unit 33 that performs boiling control for heating the hot water in the hot water storage tank 2 to the boiling target temperature by the heat pump unit 3 in the late-night time or daytime, and the boiling temperature sensor 13. When the temperature detected by one or both of the hot water storage temperature sensor 26a, for example, disposed at the upper part of the hot water storage tank 2 among the hot water storage temperature sensors 26 is low for a predetermined time, boiling is properly performed. Abnormality detecting means 34 for stopping boiling when it is determined that the boiling temperature is low and the abnormality detecting means 34 is disabled when the disaster mode is selected by the operation mode selection switch 30 of the remote controller 5. And setting means 35.

  36 is an overpressure relief valve for releasing overpressure in the hot water storage tank 2, 37 is a pressure reducing valve for reducing the pressure of the water supply, 38 is a water supply temperature sensor for detecting the temperature of the water supply, and 39 is a stop cock for opening and closing the water supply pipe 7. Thus, it is provided upstream of the pressure reducing valve 37 provided in the water supply pipe 7. A drain pipe 40 has one end connected to the bottom of the hot water storage tank 2 and a drain plug 41 that opens and closes the drain pipe 40 in the middle of the drain pipe 40. In the event of a water outage due to a disaster such as an earthquake, the stop cock 39 is closed, and when using hot water in the hot water storage tank 2, the overpressure relief valve 36 is opened and the drain plug 41 is opened. Hot water in the hot water storage tank 2 can be taken through the pipe 40.

Next, the operation of one embodiment of the present invention will be described.
First, the heating at normal time (other than the disaster mode) will be described. When the unit price of the contracted power by time reaches an inexpensive midnight time zone (for example, 23:00), the boiling control unit 33 raises the temperature. The control is started and, for example, the boiling target temperature is automatically calculated and set from the maximum amount of heat used in the past week or the average feed water temperature from 23:00 to 23:00 on the previous day, and detected by the hot water storage temperature sensor 26. Based on the stored hot water temperature, the amount of hot water stored in the hot water storage tank 2 is calculated, and the boiling start time is calculated. Then, when the boiling start time is reached, the heat pump unit 3 is driven and the circulation pump 10 is driven, hot water is taken out from the lower part of the hot water storage tank 2, heated by the water refrigerant heat exchanger 4 through the forward pipe 8, and returned. The hot water heated to the boiling target temperature is returned to the upper part of the hot water storage tank 2 via the pipe 9, and the hot hot water is stored in order from the upper part of the hot water storage tank 2. When the hot water storage temperature sensor 26 detects that the necessary amount of heat has been stored, the boiling control unit 33 stops the heat pump unit 3 and also the circulation pump 10 to end the boiling operation.

Next, the disaster mode of this embodiment will be described with reference to the flowchart of FIG. Here, when a power outage and water outage occur due to a disaster such as an earthquake, the hot water in the hot water storage tank 2 is used as domestic water during this power outage and water outage. It is supposed to boil up.
First, the invalid setting means 35 determines whether or not the disaster mode has been selected by manual operation of the operation mode selection switch 30 of the remote controller 5 (step S1), and if it is determined that the disaster mode has been selected, the invalid setting means. 35 disables the abnormality detection means 34 (step S2).

  Subsequently, the boiling control unit 33 calculates an upper limit temperature that can be raised based on, for example, the feed water temperature detected by the feed water temperature sensor 38 or the outside air temperature detected by the outside air temperature sensor (not shown), and the temperature is calculated. Set as an upper limit value of the boiling target temperature (step S3), and the user manually operates the remote controller 5, for example, manually operates the hot water supply temperature setting switch 28 of the remote controller 5, and sets an arbitrary boiling target temperature (Step S4). Thereafter, the boiling control unit 33 drives the heat pump unit 3 and the circulation pump 10 to take out hot water from the lower part of the hot water storage tank 2 and heat it with the water / refrigerant heat exchanger 4 through the forward pipe 8, and return pipe 9 starts the boiling of hot water in the hot water storage tank 2 by returning the hot water heated to the boiling target temperature to the upper part of the hot water storage tank 2 through step 9 (step S5). Boiling is performed while controlling the flow rate of the circulation pump 10 so that the temperature detected by the temperature sensor 13 becomes the boiling target temperature, and it is determined whether or not the boiling is completed (step S6). When the target temperature to be raised is 50 ° C. or higher, boiling is finished when the temperature detected by the hot water storage temperature sensor 26e or the incoming water temperature sensor 12 reaches (boiling target temperature −15) ° C. For example, when the boiling target temperature is less than 50 ° C, the temperature detected by the hot water storage temperature sensor 26e or the incoming water temperature sensor 12 is (boiling target temperature -5) ° C. If it reaches, it is determined that the boiling has been completed and the disaster mode is terminated. In addition, every time this disaster mode ends, once the setting is switched to the full tank mode among the various operation modes of boiling, it is once canceled, and if you want to perform boiling again in the disaster mode, The operation mode selection switch 30 is operated to select the disaster mode.

  In the disaster mode described above, the invalid setting means 35 sets the abnormality detecting means 34 to be invalid in step S2. However, if the abnormality detecting means 34 is not set to invalid, a power failure due to a disaster such as an earthquake will occur. During the period when the water break occurred, the hot water in the hot water storage tank 2 was taken out through the drain pipe 40 connected to the bottom of the hot water storage tank 2 and used as domestic water. The upper part is replaced with air, for example, the upper part of the hot water storage tank 2 is replaced with air up to a position between the hot water storage temperature sensor 26a and the hot water storage temperature sensor 26b. In such a state, only electric power is restored and hot water in the hot water storage tank 2 is recovered. Of the hot water storage temperature sensor 26, the hot water storage temperature sensor 26 a disposed at the upper part of the hot water storage tank 2 detects the temperature of the replaced air when boiling is performed. Therefore, there is a possibility that the temperature detected by the hot water storage temperature sensor 26a does not rise so much despite boiling, and the abnormality detection means 34 is detected by the hot water storage temperature sensor 26 provided in the upper part of the hot water storage tank 2. Even if the heating temperature is low for a predetermined time and boiling is not performed properly and the boiling temperature is judged to be abnormal, the boiling is stopped and the power is restored. May not be able to be performed, and there is a possibility that hot water that is desired to be used as domestic water cannot be generated.

  In general, when the boiling temperature sensor 13 that detects the temperature of the hot water heated by the water / refrigerant heat exchanger 4 at the time of boiling detects a low temperature for a predetermined time, the abnormality detecting means 34 appropriately raises the boiling. Since it is not carried out and the boiling temperature is judged to be abnormal because the boiling temperature is low, if the abnormality detection means 34 is not set to invalid, it can be used immediately as water for daily use such as hot water and bathing in the event of a disaster. When the temperature that can be heated, for example, about 40 ° C. is set as the boiling target temperature, the abnormality detecting means 34 determines that the boiling temperature is low and abnormally stops heating, and the power is restored in the same manner as described above. However, the hot water in the hot water storage tank 2 cannot be boiled, and there is a possibility that hot water that is used as domestic water cannot be generated.

  However, in the disaster mode in the hot water storage type hot water supply apparatus of the present embodiment, when the disaster mode is selected, the invalidity setting means 35 invalidates the abnormality detection means 34 in step S2, so the hot water storage tank described above 2 Boiling hot water in the hot water storage tank 2 can be boiled without being judged abnormal even when boiling with the upper part replaced with air, or when the boiling target temperature is set to a low temperature. In addition, even when the power is restored while the water shut-off state continues, the hot water in the hot water storage tank 2 can be boiled to generate hot water to be used as domestic water.

  In the disaster mode, the user manually operates the remote controller 5 to set an arbitrary boiling target temperature in step S4. When the boiling target temperature is set to a low temperature, for example, about 40 ° C., It produces hot water at a temperature that can be used directly in a bath, etc., and can be used immediately after being taken out of the hot water storage tank 2, and it is convenient to use. In this case, although it is in a range not exceeding the upper limit value set in step S3, the boiling target temperature is set to a high temperature, for example, about 80 ° C. Water that has been obtained from cars, etc., and that has been put into a plastic tank, etc., is put in a container such as a bucket and mixed to produce hot water at a temperature that can be used directly for hot water and baths. It is possible to provide water for daily use such as hot water and bath while minimizing the consumption of hot water in the house, and the user can use the hot water in the hot water tank 2 very effectively by arbitrarily setting the boiling target temperature according to the application Is something that can be done.

  The present invention is not limited to the above embodiment. In the above embodiment, the disaster mode can be selected by operating the operation mode selection switch 30 of the remote controller 5. Since the disaster mode is not normally used, the operation mode selection switch 30 can select the full tank mode, the automatic mode, and the midnight only mode, and perform predetermined operations such as the operation mode selection switch 30 and the hot water temperature setting switch. The disaster mode may be selected by simultaneously pressing and holding 28.

The schematic block diagram of one Embodiment of this invention. The principal part block diagram of the same embodiment. The flowchart which shows the boiling in the mode at the time of a disaster of the same embodiment.

Explanation of symbols

2 Hot water storage tank 3 Heating means (heat pump unit)
4 Heating heat exchanger (water refrigerant heat exchanger)
5 remote control 8 forward pipe 9 return pipe 10 circulating pump 13 boiling temperature detection means (boiling temperature sensor)
26 Hot water storage temperature detection means (hot water storage temperature sensor)
33 Boiling control unit 34 Abnormality detection means

Claims (1)

  A hot water storage tank for storing hot water, heating means for heating the hot water in the hot water storage tank, a forward pipe from the lower part of the hot water storage tank to a heating heat exchanger housed in the heating means, and in the middle of the forward pipe A circulation pump provided for circulating hot water, a return pipe returning from the heating heat exchanger to the upper part of the hot water storage tank, and a temperature of hot water after being heated by the heating heat exchanger provided in the return pipe Boiling temperature detection means, a plurality of hot water temperature detection means arranged in the vertical direction of the hot water storage tank for detecting the temperature of the hot water storage hot water, and boiling water for boiling the hot water in the hot water storage tank to the target temperature. The temperature detected by one or both of the raising control unit and the boiling temperature detecting means and the hot water storage temperature detecting means provided above the hot water storage tank during the boiling is low for a predetermined time. In the hot water storage type hot water supply apparatus provided with an abnormality detection means for judging that there is an abnormality and stopping the boiling, a disaster mode is provided in which the abnormality detection means is disabled and boiling is performed. When selected, the hot water storage type hot water supply apparatus is configured such that an arbitrary boiling target temperature can be set by manually operating a remote controller for operating the hot water storage type hot water supply apparatus.

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