JP3743218B2 - Hot water storage type electric water heater - Google Patents

Description

[0001]
BACKGROUND OF THE INVENTION
The present invention relates to a hot water storage type electric water heater.
[0002]
[Prior art]
Conventionally, this kind of hot water storage type electric water heater is disclosed in Japanese Patent Application Laid-Open No. 2-169958. Hereinafter, conventional techniques will be described with reference to the drawings. In FIG. 8, during the midnight hours, the lower heating element 2 of the hot water tank 1 is energized to boil the water in the hot water tank. Further, when chasing, the upper heating element 3 is energized to boil water above the upper heating element 3.
[0003]
[Problems to be solved by the invention]
However, in the configuration as described above, since the water in the hot water storage tank below the position of the lower heating element 2 cannot be heated, the entire capacity of the hot water storage tank 1 cannot be raised, and the hot water storage tank 1 is large. It becomes. In addition, a heater for chasing is required, and it is necessary to switch the operation by providing heaters on the upper and lower parts respectively.
[0004]
The present invention solves the above-mentioned problems, and is capable of chasing with one heater and storing hot water heated in the entire capacity of the hot water tank.
[0005]
[Means for Solving the Problems]
In order to solve the above problems, the present invention provides a hot water tank that is supplied with water from the lower part and discharged from the upper part, a heater provided in the upper part of the hot water tank, a hot water tank position above the heater, and the vicinity of the lowermost part of the hot water tank. It is set as the structure provided with the circulation pump provided in the water circuit which connects a position.
[0006]
With the above configuration, when boiling the water in the entire hot water tank, the hot water heated by the heater is circulated from the upper part to the lower part of the hot water tank, or the entire hot water tank is boiled, or the water near the bottom of the hot water tank The water is circulated to the hot water tank position above the heater and heated up. Hot water is stored from the upper part of the hot water tank and stored in the entire hot water tank. At the time of reheating, the circulation pump is stopped and water above the heater is boiled and used for hot water supply. Therefore, both the functions of reheating and boiling the whole amount of hot water storage tank can be realized with one heater. In addition, when the water in the upper part of the hot water tank is circulated to the lower part of the hot water tank while it is energized, the water heated by the heater is low-temperature water that is fed forward from the lower part of the hot water tank. Has an effect of improving the durability of the heater against scale water having high water hardness or acidic water that easily causes corrosion. On the other hand, when the heater is energized and the water near the bottom of the hot water tank is circulated to the hot water tank position above the heater and boiled, the water circulating from the lower part of the hot water tank to the upper part is the low-temperature water supplied. Therefore, the amount of heat released from the circulation circuit is also reduced, resulting in energy saving.
[0009]
DETAILED DESCRIPTION OF THE INVENTION
According to a first aspect of the present invention is water from the lower, the hot water storage tank which is tapped from the top, and a heater provided inside the upper portion of the hot water storage tank, and the hot water storage tank located at the top than the heater hot-water A circulation pump provided in a water circuit connecting positions near the bottom of the tank, first temperature detecting means for detecting the hot water temperature in the hot water tank above the heater, and detecting the hot water temperature in the lower part of the hot water tank. When the temperature signal of the second temperature detection means and the second temperature detection means reaches a set temperature A (40 to 65 ° C.), the circulation pump is stopped, and then the temperature of the first temperature detection means An operation control means for operating the circulating pump when the signal reaches a set temperature B (85 to 90 ° C.) and stopping the circulating pump when the signal falls to a set temperature C (intermediate temperature between predetermined temperatures A and B); comprising a was heated at the heater hot-water storage Circulate the hot water in the upper part of the hot water tank to the set temperature A and boil all the water in the hot water to a uniform hot water temperature, or circulate the water near the bottom of the hot water tank to the hot water tank position above the heater. Boiling, hot water is stored from the upper part of the hot water tank, and the entire amount of hot water is stored up to a set temperature A at a constant hot water temperature. Then, the circulation pump is stopped, and when the temperature of the water in the upper part of the heater reaches a set temperature B, the circulation pump is operated while the heater is energized to circulate the hot water in the upper part of the hot water tank to the lower part or Circulates water near the bottom of the tank to the hot water tank position above the heater. Therefore, by having the set temperature A of the hot water supply possible temperature of 40 to 65 ° C., the entire amount of the hot water storage tank can be used for hot water supply in a short time. Further, since the time for storing hot water at the intermediate set temperature A is long, the heat dissipation loss from the hot water tank is reduced, resulting in energy saving.
[0010]
The invention according to claim 2 is a hot water storage tank which is supplied with water from the lower part and discharged from the upper part, a heater provided in the upper part of the hot water storage tank, the hot water storage tank position above the heater and the hot water storage tank. A circulation pump provided in a water circuit connecting positions near the lowermost part of the water heater, a first temperature detecting means for detecting the hot water temperature in the hot water tank above the heater, and a first temperature detecting means for detecting the hot water temperature in the lower part of the hot water tank. When the temperature signals of the second temperature detection means and the second temperature detection means reach the set temperature A, the circulating pump is stopped, and then the temperature signal of the first temperature detection means becomes the set temperature B (set An operation control means for operating the circulating pump when the temperature reaches a set temperature C (intermediate temperature between the predetermined temperatures A and B); Duplicate detection of water temperature in the vertical direction Temperature detecting means, a hot water amount calculating means for calculating the amount of hot water inside the hot water tank by detecting a signal of the temperature detecting means, and a signal of the hot water amount calculating means to detect the amount of remaining hot water, the setting There is provided hot water temperature control means for transmitting a signal for lowering the set value of the temperature B to the operation control means, and the remaining hot water amount is calculated from the remaining hot water temperature in the hot water storage tank at the start of operation. When the amount of remaining hot water is large, the water in the entire hot water tank is boiled up to a set temperature A to a uniform hot water temperature, and then the set temperature B is lowered and boiled up. Therefore, it is possible to reduce the heat dissipation loss from the hot water storage tank after the completion of boiling and to follow the hot water supply load.
[0011]
Further, the invention according to claim 3 is provided with a manual replenishment setting means, and an operation stop means for detecting a signal from the replenishment setting means, energizing the heater and de-energizing only the circulation pump. When a chasing signal from the manual switch is detected during operation or stop, the heater is energized and only the circulation pump is de-energized. Then, the water in the upper hot water tank is boiled from the heater. Therefore, hot water is boiled in a short time when hot water is urgently needed.
[0012]
The invention according to claim 4 includes a second circuit connected from the water circuit to the vicinity of the middle of the capacity of the hot water tank via the flow path switching means, and is heated by the heater when the hot water supply load is small such as in summer. The hot water is returned from the upper part of the hot water storage tank to the middle of the capacity of the hot water tank through the circulation circuit B and the flow path switching means. While repeating this, hot water is stored from the middle of the hot water storage tank to the upper part. Alternatively, low temperature water near the middle of the capacity of the hot water tank is made to flow to the upper part of the hot water tank via the flow path switching means and the circulation pump and heated by the heater. While repeating this, hot water is stored from the middle of the hot water storage tank to the upper part. Therefore, since the amount of boiling water can be varied, energy saving is further achieved when the hot water supply load is small, such as in summer.
[0013]
【Example】
Embodiments of the present invention will be described below with reference to the drawings. In addition, in a prior art example and each Example, the same code | symbol is attached | subjected about what has the same structure and the same operation | movement, and description is partially abbreviate | omitted.
[0014]
Example 1
1 and 2 are configuration diagrams of a hot water storage type electric water heater according to Embodiment 1 of the present invention. In FIG. 1, reference numeral 1 denotes a hot water storage tank, in which water in the water supply pipe 2 is supplied from the lower part, and hot water is discharged from the upper part through the hot water outlet pipe 3. Reference numeral 4 denotes a heater, which is provided in the upper part of the hot water tank 1. A circulation pump 5 circulates the water in the hot water tank 1 above the heater 4 to a position near the lowermost part of the hot water tank 1, or uses the water near the lowermost part of the hot water tank 1 as shown in FIG. Circulate to tank 1 position. The arrows in FIGS. 1 and 2 indicate the water circulation direction.
[0015]
Next, the operation of the first embodiment having the above configuration will be described. First, the operation of boiling the entire amount of hot water storage tank from the water supplied to the hot water storage tank 1 will be described.
[0016]
While the heater 4 is energized, the water in the upper part of the hot water tank 1 is circulated to the lower part of the hot water tank 1, and the entire amount of the hot water tank 1 is heated to hot water by repeating this process. Alternatively, while energizing the heater 4, water near the lowermost part of the hot water tank 1 is circulated and heated to the hot water tank 1 position above the heater 4, hot water is stored from the upper part of the hot water tank 1, and stored in the entire hot water tank 1. . In addition, when the hot water runs out or when it is replenished, the water above the heater 4 is boiled and used for hot water supply with the circulation pump 5 stopped. Therefore, both the functions of reheating and boiling the whole amount of hot water storage tank can be realized with one heater.
[0017]
In addition, when the water in the upper part of the hot water tank 1 is circulated to the lower part of the hot water tank 1 while the heater 4 is energized, and the entire amount of the hot water tank 1 is heated to hot water, the water heated by the heater 4 is lower in the hot water tank 1. Therefore, the surface temperature of the heater 4 is low, and the durability of the heater 4 with respect to high-hardness scale water or acidic water that is likely to cause corrosion is improved.
[0018]
On the other hand, when the water in the vicinity of the lowermost part of the hot water tank 1 is circulated to the position of the hot water tank 1 above the heater 4 while the heater 4 is energized, the water circulating from the lower part to the upper part of the hot water tank 1 is supplied. Because it is low-temperature water, the amount of heat released from the circulation circuit is reduced and energy is saved.
[0019]
(Example 2)
FIG. 3 is a configuration diagram of a hot water storage type electric water heater according to Embodiment 2 of the present invention. In FIG. 3, reference numeral 6 denotes a temperature detecting means for detecting the hot water temperature inside the hot water tank 1 above the heater 4. Reference numeral 7 denotes a clock, which measures time. Reference numeral 8 denotes operation control means A, which continuously operates the heater 4 and the circulation pump 5 when the signal of the clock 7 is a signal in the midnight time zone. Reference numeral 9 denotes operation control means B, which operates the circulation pump 5 when the temperature signal of the temperature detection means 6 rises to the set temperature A when the signal of the clock 7 is a signal in the daytime time zone, and the temperature of the temperature detection means 6 When the signal falls to the set temperature B (lower temperature than the set temperature A), the operation of the circulation pump 5 is stopped.
[0020]
Next, the operation of the embodiment having the above configuration will be described. First of all, I will discuss the heating up of the midnight hours. The signal of the clock 7 transmits the midnight time zone, and the heater 4 and the circulation pump 5 are continuously operated. Then, the hot water in the upper part of the hot water tank 1 heated by the heater 4 is circulated to the lower part of the hot water tank 1, and the entire amount of the hot water tank 1 is heated to hot water by repeating this process. Alternatively, water in the vicinity of the lowermost part of the hot water tank 1 is circulated and heated to the hot water tank 1 position above the heater 4, hot water is stored from the upper part of the hot water tank 1, and stored in the entire hot water tank 1.
[0021]
Next, we will discuss the heating of daytime hours. The heater 4 is energized with the circulation pump 5 stopped. In this way, when the water in the upper part of the heater 4 rises and reaches the set temperature A, the circulating pump 5 is operated while the heater 4 is energized, and the water in the vicinity of the lowermost part of the hot water tank 1 is used as the hot water tank in the upper part of the heater 4. Circulate to 1 position. Then, when the hot water temperature in the upper part of the heater 4 is lowered to a set temperature B (lower than the set temperature A), the operation of the circulation pump 5 is stopped and the water in the upper part of the heater 4 is again boiled up to the set temperature A. . By repeating this operation, the hot water at the set temperature A is gradually pushed down below the hot water tank 1. Therefore, first, the total amount of water in the hot water tank 1 can be boiled over 8 to 9 hours in the midnight time zone, so that the running cost is low. In addition, during the daytime hours, only the upper part of the hot water storage tank 1 can be heated to make hot water, which improves convenience in the event of running out of hot water or an emergency.
[0022]
Example 3
FIG. 4 is a configuration diagram of a hot water storage type electric water heater according to Embodiment 3 of the present invention. In FIG. 4, reference numeral 10 denotes first temperature detection means for detecting the hot water temperature of the hot water tank 1 above the heater 4. 11 is a 2nd temperature detection means, and detects the hot water temperature of the lower part of the hot water storage tank 1. FIG. An operation control unit 12 stops the circulation pump 5 when the temperature signal of the second temperature detection unit 11 reaches the set temperature A, and then the temperature signal of the first temperature detection unit 10 changes to the set temperature B. The circulating pump 5 is operated when it reaches (higher than the predetermined temperature A), and the circulating pump 5 is stopped when it falls to the set temperature C (intermediate temperature between the predetermined temperatures A and B).
[0023]
Next, the operation of the embodiment having the above configuration will be described. The hot water in the upper part of the hot water tank 1 heated by the heater 4 is circulated to the lower part of the hot water tank 1, and by repeating this, the entire amount of water in the hot water tank 1 is boiled up to a set temperature A to a uniform hot water temperature. Alternatively, the water near the bottom of the hot water tank 1 is circulated and heated to the hot water tank 1 position above the heater 4, hot water is stored from the upper part of the hot water tank 1, and the entire amount of water in the hot water tank 1 is uniformly heated to the set temperature A. Store hot water. Then, when the circulation pump 5 is stopped and the water in the upper part of the heater 4 rises in temperature and reaches the set temperature B, the circulation pump 5 is operated while the heater 4 is energized to circulate the hot water in the upper part of the hot water tank 1 downward. To do. Alternatively, water near the lowermost part of the hot water tank 1 is circulated to the hot water tank 1 position above the heater 4. Therefore, by setting the set temperature A to a hot water supply possible temperature of 40 to 65 ° C. and the set temperature B to 85 to 90 ° C., the entire amount of the hot water tank can be used for hot water supply in a short time. Further, since the time for storing hot water at the intermediate set temperature A is long, the heat dissipation loss from the hot water tank is reduced, resulting in energy saving.
[0024]
(Example 4)
FIG. 5 is a configuration diagram of a hot water storage type electric water heater according to Embodiment 4 of the present invention. In FIG. 5, reference numeral 13 denotes temperature detection means, and there are a plurality of temperature detection means for detecting the water temperature in the vertical direction inside the hot water tank 1. 14 is a hot water amount calculating means, which detects a signal from the temperature detecting means 13 and calculates the hot water amount inside the hot water tank 1. A hot water temperature control means 15 detects the signal of the hot water amount calculation means 14, changes the set value of the set temperature B, and transmits the signal to the operation control means 12.
[0025]
Next, the operation of the embodiment having the above configuration will be described. At the start of operation, the amount of hot water is calculated from the hot water temperature in the vertical direction in the hot water tank. When the amount of remaining hot water is large, the water in the entire hot water storage tank 1 is boiled up to a set temperature A to a uniform hot water temperature, and then the set temperature B is lowered and boiled up. Therefore, it is possible to reduce the heat dissipation loss from the hot water storage tank after the completion of boiling and to follow the hot water supply load.
[0026]
(Example 5)
FIG. 6 is a configuration diagram of a hot water storage type electric water heater according to a fifth embodiment of the present invention. In FIG. 6, reference numeral 16 denotes a reheating setting means, which is a manual switch for reheating the hot water tank 1. Reference numeral 17 denotes an operation stop means, which detects a signal from the tracking setting means 16 and energizes the heater 3 so that only the circulation pump 5 is de-energized.
[0027]
Next, the operation of the embodiment having the above configuration will be described. When the recirculation signal from the manual switch is detected while the circulation pump 5 is operating or stopped, the heater 4 is energized and only the circulation pump 5 is de-energized. Then, the water in the upper hot water tank 1 is boiled from the heater 4. Therefore, hot water is boiled in a short time when hot water is urgently needed.
[0028]
(Example 6)
FIG. 7 is a configuration diagram of a hot water storage type electric water heater according to Embodiment 6 of the present invention. In FIG. 7, reference numeral 18 denotes a flow path switching means that switches to a circulation circuit A 19 connected to the lower part of the circulation pump 5 and the hot water tank 1 and a circulation circuit B 20 connected to the vicinity of the middle of the capacity of the hot water tank 1.
[0029]
Next, the operation of the embodiment having the above configuration will be described. When the hot water supply load is small, such as in summer, the hot water heated by the heater 4 is moved from the upper part of the hot water tank 1 to the middle of the capacity of the hot water tank 1 through the circulation pump 5 and the flow path switching means 18 through the circulation circuit B20. return. While repeating this, hot water is stored from near the middle of the capacity of the hot water tank 1 to the upper part. Alternatively, low-temperature water near the middle of the capacity of the hot water tank 1 is flowed to the upper part of the hot water tank 1 via the flow path switching means 18 and the circulation pump 5 and heated by the heater 4. While repeating this, hot water is stored from near the middle of the capacity of the hot water tank 1 to the upper part. Therefore, since the amount of boiling water can be varied, energy saving is further achieved when the hot water supply load is small, such as in summer.
[0032]
【The invention's effect】
According to invention of Claim 1 , having the preset temperature A of the hot water supply possible temperature of 40-65 degreeC, the hot water storage tank whole quantity can be utilized for hot water supply in a short time. Further, since the time for storing hot water at the intermediate set temperature A is long, the heat dissipation loss from the hot water tank is reduced, resulting in energy saving.
[0033]
Further, according to the invention described in claim 2 , it is possible to reduce the heat dissipation loss from the hot water storage tank after the completion of boiling and to boil up following the hot water supply load.
[0034]
According to the third aspect of the present invention, when a reheating signal from the manual switch is detected during operation or stop of the circulation pump, the heater is energized and only the circulation pump is de-energized. Then, the water in the upper hot water tank is boiled from the heater. Therefore, hot water is boiled in a short time when hot water is urgently needed.
[0035]
According to the invention described in claim 4 , the flow path switching means for switching between the circulation circuit A connecting the circulation pump and the lower part of the hot water storage tank and the circulation circuit B connecting the vicinity of the middle of the hot water storage tank is provided. By changing the amount of hot water, energy saving can be achieved when the hot water supply load is small, such as in summer.
[Brief description of the drawings]
FIG. 1 is a block diagram of a hot water storage type electric water heater according to a first embodiment of the present invention. FIG. 2 is a block diagram of another type of hot water storage type electric water heater according to the first embodiment. Fig. 4 is a block diagram of a hot water type electric water heater in Embodiment 3 of the present invention. Fig. 5 is a block diagram of a hot water type electric water heater in Embodiment 4 of the present invention. Fig. 7 is a block diagram of a hot water storage type electric water heater in Embodiment 5 of the present invention. Fig. 7 is a block diagram of a hot water storage type electric water heater in Embodiment 6 of the present invention. Fig. 8 is a block diagram of a conventional hot water storage type electric water heater. Explanation of]
DESCRIPTION OF SYMBOLS 1 Hot water tank 2 Water supply pipe 3 Hot water discharge pipe 4 Heater 5 Circulation pump 6 Temperature detection means 7 Clock 8 Operation control means A
9 Operation control means B
DESCRIPTION OF SYMBOLS 10 1st temperature detection means 11 2nd temperature detection means 12 Operation control means 13 Temperature detection means 14 Hot water amount calculation means 15 Hot water temperature control means 16 Reheating setting means 17 Operation stop means 18 Flow path switching means 19 Circulation circuit A
20 Circulation circuit B

Claims (4)

A hot water tank supplied with water from the lower part and discharged from the upper part, a heater provided in the upper part of the hot water tank, and a water circuit connecting the hot water tank position above the heater and the position near the lowermost part of the hot water tank. A circulating pump provided; a first temperature detecting means for detecting a hot water temperature in a hot water tank above the heater; a second temperature detecting means for detecting a hot water temperature in a lower part of the hot water tank; The circulating pump is stopped when the temperature signal of the temperature detecting means reaches the set temperature A (40 to 65 ° C.), and then the temperature signal of the first temperature detecting means is set to the set temperature B (85 to 90 ° C.). A hot water storage type electric water heater comprising operation control means for operating the circulation pump when the temperature reaches the set temperature and stopping the operation of the circulation pump when the temperature drops to a set temperature C (intermediate temperature between predetermined temperatures A and B). A hot water tank supplied with water from the lower part and discharged from the upper part, a heater provided in the upper part of the hot water tank, and a water circuit connecting the hot water tank position above the heater and the position near the lowermost part of the hot water tank. A circulating pump provided; a first temperature detecting means for detecting a hot water temperature in a hot water tank above the heater; a second temperature detecting means for detecting a hot water temperature in a lower part of the hot water tank; The circulating pump is stopped when the temperature signal of the temperature detecting means reaches the set temperature A, and then the circulation is performed when the temperature signal of the first temperature detecting means reaches the set temperature B (higher than the set temperature A). Operation control means for operating the pump and stopping the circulation pump when the temperature drops to a set temperature C (intermediate temperature between predetermined temperatures A and B), and a plurality of temperature detections for detecting the water temperature in the vertical direction inside the hot water tank Means and the temperature detection Detecting the signal of the means and calculating the amount of hot water inside the hot water tank, and detecting the signal of the hot water amount calculating means, and if the amount of remaining hot water is large, a signal for lowering the set value of the set temperature B A hot water storage type electric water heater comprising hot water temperature control means for transmitting to the operation control means. The hot water storage type electric water heater according to claim 1 or 2 , further comprising: a manual reheating setting unit; and an operation stopping unit that detects a signal from the reheating setting unit and energizes the heater to de-energize only the circulation pump. 3. The hot water storage type electric water heater according to claim 1, further comprising a second circuit connected from the water circuit to an intermediate vicinity of a capacity of the hot water storage tank through a flow path switching unit.

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