JP2556527Y2 - Circulating hot water utilization equipment - Google Patents

Description

[Detailed description of the invention]

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a circulating hot water utilization apparatus that utilizes hot water while reheating heated water using a hot water storage type electric water heater as a heat source.

[0002]

2. Description of the Related Art Typical examples of a circulating hot water utilization apparatus using a hot water storage type electric water heater as a heat source include a hot water circulating bath apparatus and a hot water circulating floor heating apparatus. JP-A-64-192
No. 49 discloses that a heat exchanger is disposed in a hot water tank of a hot water storage type electric water heater, a hot water circulation path having a circulation pump is provided between the heat exchanger and the bathtub, and the circulation pump is driven. The hot water in the bathtub is guided to the heat exchanger, the heat exchanger reheats the hot water using heat in the hot water tank, and the reheated hot water is returned to the bathtub so that the temperature of the hot water in the bathtub falls within a predetermined range. A hot water circulating bath apparatus to maintain is disclosed.

[0003]

In the conventional circulating hot water utilization apparatus as disclosed in the above-mentioned publication, only the amount of hot water in the hot water tank heated and stored in a specific time zone such as a midnight power time zone is used. It was thought that the hot water guided to the heat exchanger (for example, hot water supplied from a bathtub) could be sufficiently reheated. However, when the number of customers is large, such as during a twilight, or when a large amount of hot water is used for washing in winter, the amount of hot water stored in the hot water tank of the water heater is used in large quantities, resulting in a shortage of hot water. There is. In such a case, since the temperature of the hot water in the hot water tank decreases, there arises a problem that the hot water guided to the heat exchanger using the heat exchanger cannot be reheated to a desired temperature. The purpose of the present invention, the temperature
Whether or not to reheat by setting of the water heater control setting device
The hot water storage type electric water heater that has the function to select the heat source
In the case where the hot water in the hot water storage type electric water heater is used in a large amount, the hot water introduced into the heat exchanger can be reheated to a desired temperature without fail. Is to do.

[0004]

According to the present invention, a hot water tank is provided.
Main heater located in the lower area inside and a hot water tank
Heat exchanger located in the upper area inside the hot water tank
Located below the heat exchanger in the upper region
It includes a reheating heater, the finger-old reheating in accordance with the set
A water heater control setting device that outputs control commands;
Control and energization of the heater and heater for reheating
When a command is input, the specified control mode
Heater energization control device that controls energization of the reheating heater
And a hot water storage type electric water heater having: This water heater
Performs reheating with the setting of the water heater control setting device
It has a function to select whether or not. Also hot water storage type electricity
Reheat the hot water supplied from the water heater with a heat exchanger.
Use hot water circulation equipment such as hot water circulation bath equipment
I have. In the present invention, hot water circulation utilization equipment
When an operating state is detected by detecting whether the
Reheating finger that outputs a heating command to the heater power control unit
Command generator, and the heater control unit controls the water heater
Follow up from both the setting device and the reheating command generation device.
It is configured to be able to input a firing command.

[0005] hot water tank located a temperature sensor for measuring the water temperature in the upper region of the hot water tank in order to obtain information for determining the stoppage of energization to add have fired heater, above the heat exchanger May be provided on the upper wall .

[0006]

According to the present invention, when a large amount of hot water causes a so-called hot water shortage and the temperature of the hot water in the upper region in the hot water tank in which the heat exchanger is arranged is lowered, the reheating heater is used. By generating heat, the temperature of hot water in the upper region can be increased in a short time. Therefore, the hot water guided to the heat exchanger can be reliably reheated. Storage with reheating heater
Hot water type electric water heater for water heaters such as remote controllers
Select whether or not to reheat by setting of the control setting device
Control device for water heaters
If you do not set reheating by
Even with a heater, the temperature of hot water in the hot water tank
It became impossible to reheat the hot water led to the heat exchanger
At times, there is a problem that reheating is not started. Therefore
Use of hot water circulation such as hot water circulation type bath equipment as in the present invention
Detects operating status by detecting whether the device is operating
Then, the reheating command is output to the heater controller.
Command generation device, heater heater control device for water heater
From both the control setting device and the reheating command generator
If it is configured to be able to input a reheating command, hot water circulation
It is necessary to reheat the hot water by the heat exchanger
Sometimes, it is necessary to maintain a state where reheating is possible
it can. Therefore, according to the present invention, a water heater control setting device
Function to select whether or not to reheat by setting
When using a stored hot water heater as a heat source
The above-mentioned problem that occurs can be solved.

[0007] When the temperature sensor for the heater stop control fired have additionally provided on the wall portion of the hot water tank positioned above the heat exchanger, the occurrence of boiling of water at the time of reheating can be reliably prevented. When the heat exchanger is used, heat loss through the heat exchanger occurs as compared with the case where the reheating heater is used without the heat exchanger. for that reason,
In consideration of the heat loss due to the heat exchanger in advance, the amount of heat calorie discharged from the reheating heater must be increased.
The power supply to the reheating heater is stopped when the temperature sensor disposed in the upper region in the hot water tank detects the set temperature. However, if the temperature sensor is disposed immediately above the reheating heater, and when the temperature sensor detects an appropriate temperature, the temperature of the hot water already located at the uppermost portion in the upper region becomes 100 ° C. or higher and the hot water becomes hot. Boiling may occur. If the temperature sensor is provided on the upper wall of the hot water tank located above the heat exchanger, the energization of the reheating heater can be reliably stopped before the hot water boils, increasing safety. .

[0008]

BRIEF DESCRIPTION OF THE DRAWINGS FIG. 1 is a block diagram showing an embodiment of the present invention; FIG. 1 is a schematic configuration diagram of an embodiment in which the present invention is applied to a circulating hot water utilization device in which a hot water circulation type bath appliance uses a hot water circulation utilization device. In the figure, 1 is a hot water storage type electric water heater, 2 is a bathtub, 3 is a hot water circulation control device, 4
Is a hot water circulation flow path for circulating hot water between a heat exchanger 1e, which will be described later, of the hot water storage type electric water heater and the bathtub 2 via the hot water circulation control device 3, and 5 is provided with a pressure reducing valve 6 in the middle and connected to the water supply. A supply line for supplying hot water from the hot water storage type electric water heater 1 to the faucet 8, a drain line 9 for discharging boiling water through a safety valve 10, and a hot water supply line 11 described later. This is a drain pipe for draining water in the tank 1b. The hot water storage type electric water heater 1 includes a main heater 1c in a lower region of a hot water tank 1b disposed inside an outer case 1a. The main heater 1c is a late-night heater for boiling water in the hot water tank 1b to a predetermined temperature during a so-called late-night power time zone. A first temperature sensor 1d used for controlling power supply stop of the main heater 1c is provided in a portion of the hot water tank 1b immediately above the main heater 1c. The main heater 1c is controlled to be energized by a heater energization control device (not shown). Usually, when the first temperature sensor 1d detects a set temperature, the main heater 1c determines that the hot water in the hot water storage tank 1b has been heated to a predetermined temperature. The energization to is stopped. The heat exchanger 1e is located in the upper region of the hot water tank 1b.
And a reheating heater 1f are disposed. The heat exchanger 1e is a double-pipe heat exchanger that reheats hot water supplied through the hot water circulation channel 4 with the heat of the hot water in the hot water tank 1b. The reheating heater 1f is positioned below the heat exchanger 1e, and is energized by a heater energization control device (not shown). A second temperature sensor 1g is attached to an upper wall of the hot water tank 1b located above the heat exchanger 1e to obtain information for determining the stop of energization of the reheating heater.

An end of a forward pipe 4a of the hot water circulation path 4 and an end of a return pipe 4b are attached to the side wall 2a of the bathtub 2. A water level sensor 3a is mounted in the middle of the outgoing pipe 4a. The water level sensor 3a determines the water level in the bathtub 2 based on the water pressure, and outputs an operation stop command to the control circuit 3b when the amount of hot water in the bathtub 2 is below the minimum water level L. Also the outgoing pipe 4
A circulation pump 3c is arranged in the middle of a, and the operation of the circulation pump 3c is controlled according to a command from the control circuit 3b to circulate the hot water in the bathtub 2 through the heat exchanger 1e. A temperature sensor 3d is arranged in the middle of the return pipe 4b. The temperature sensor 3d measures the temperature of hot water in the bathtub 2. When the temperature of the hot water measured by the temperature sensor 3d falls below a predetermined lower limit temperature, the control circuit 3b operates the circulation pump 3c.
Is driven to circulate hot water, and when the temperature of the hot water measured by the temperature sensor 3d reaches a predetermined upper limit temperature, the control circuit 3b stops the circulation pump 3c to stop the circulation of the hot water. Control circuit 3b
Is activated when the power switch of the remote controller 3e is turned on, and stops operating when the power switch is turned off.

When the power switch of the remote controller 3e is turned on and the hot water circulation control device 3 is in the operating state, a large amount of hot water in the hot water tank 1b of the hot water storage type electric water heater 1 is used to exchange heat. When the temperature of the hot water in the upper region in the hot water tank 1b in which the vessel 1e is arranged is significantly reduced,
Hot water in the bathtub 2 cannot be reheated to a desired temperature using the heat exchanger 1e. In this embodiment, before or after such a state, the reheating heater 1f generates heat, so that the temperature of the hot water in the upper region in the hot water tank 1b can be raised in a short time. The reheating of the hot water in the bathtub 2 by the heat exchanger 1e can be restarted in a short time. Further, since the second temperature sensor 1g is attached to the upper wall of the hot water tank 1b, the energization of the reheating heater can be stopped before the hot water in the upper region in the hot water tank 1b boils.

There is no problem if the hot water storage type electric water heater 1 having the reheating heater is of a type that can always reheat. However, the hot water storage type electric water heater 1
In the case where the remote control or the control instruction panel or the like has a function to select whether or not to perform reheating by setting of the control setting device for the water heater, and when the reheating is not set, However, no matter how many heaters are provided, when the temperature of hot water in the hot water tank drops and it becomes impossible to reheat the hot water guided to the heat exchanger, the Occurs. FIG. 2 is a block diagram schematically showing a control system according to an embodiment capable of solving such a problem.

In FIG. 2, the same members as those used in the embodiment shown in FIG. 1 are denoted by the same reference numerals as those shown in FIG. In FIG. 2, the members not shown in FIG. 1 are a reheating command generation device 12, a water heater control setting device 1h of the hot water storage type electric water heater 1, and an OR circuit 1i,
This is a heater power supply control device 1m including a control means 1j and a power supply circuit 1k. The reheating command generation device 12 detects whether or not the hot water circulation control device 3 is in operation and detects whether or not the hot water circulation utilization device is operating, and outputs a reheating command to the heater energization control device 1m. A specific example of the reheating command generation device 12 is that the power switch of the remote controller 3e is closed and the hot water circulation control device 3
And a control circuit 3b having a built-in operation state display signal generation circuit to determine whether or not an operation state display signal is generated from the circuit. A circuit that detects and determines whether or not the hot water circulation utilization device operates can be used. When the reheating is set by the setting switch, the water heater control setting device 1h including a remote controller or the like outputs a reheating command to the heater energization control device 1m. Although not shown, the water heater control setting device 1h also has a function of instructing the heater energization control device 1m to select a control mode of the main heater, set a hot water temperature, and the like. Control means 1i
Controls energization of each heater according to software stored in advance using a microcomputer. The reheating command generator 12 may be installed on either the hot water circulation controller 3 or the heater power controller 1m.
Further, the judgment function of the reheating command generating device 12 can be realized using a microcomputer as in the control means 1i. FIG. 3 is a flowchart illustrating an example of an algorithm in a case where the reheating control including the determination function of the reheating command generation device 12 is performed using a microcomputer. In FIG. 3, T1 is the hot water temperature measured by the first temperature sensor 1d, TL is the lower limit set temperature for starting reheating, and TH is the upper limit set temperature for stopping reheating.

According to this embodiment, even if reheating is not set by the water heater control setting device 1h, the reheating command is always output from the reheating command generating device 12 when the hot water circulation control device 3 is in the operating state. Therefore, reheating in the system for reheating the hot water in the bathtub 2 using the heat exchanger 1e can be reliably performed when necessary.

Each of the above embodiments is an example in which the present invention is applied to a circulating hot water utilization apparatus using a hot water circulating bath apparatus as a hot water circulating utilization apparatus. Of course, it may be applied to a circulation type hot water utilization device.

The reheating heater only needs to have the heater portion located in the upper region of the hot water tank 1b, and the mounting portion does not need to be located in the upper region.

[0016]

According to the present invention , when the temperature of the hot water in the upper region in the hot water tank in which the heat exchanger is arranged is decreased due to the use of a large amount of hot water, the reheating heater is heated to generate heat. There is an advantage that the temperature of the hot water in the upper region can be raised in a short time, and the hot water guided to the heat exchanger can be reheated reliably and in a short time. In particular, according to the invention,
Whether or not to reheat by setting of the water heater control setting device
Use a hot water storage type electric water heater that has a function to select
The water heater control setting device
Guided to heat exchanger even when reheating is not set
When reheating is needed to reheat hot water,
There is an advantage that reheating can be performed.

[0017] Reheating if Kere wall portion <br/> set on a hot water tank temperature sensor in the heater stop control is located above the heat exchanger, it is possible to prevent occurrence of boiling of water at the time of reheating There are advantages.

[Brief description of the drawings]

FIG. 1 is a diagram showing a schematic configuration of an embodiment of the present invention.

FIG. 2 is a block diagram showing a configuration of a control system when using a hot water storage type electric water heater having a function of selecting whether or not to perform reheating by setting of a water heater control setting device.

FIG. 3 is a flowchart illustrating an algorithm when reheating control is performed using a microcomputer.

[Explanation of symbols]

DESCRIPTION OF SYMBOLS 1 ... Hot water storage type electric water heater, 2 ... Bathtub, 3 ... Hot water circulation control apparatus, 4 ... Hot water circulation path, 5 water supply pipeline, 6 ... Pressure reducing valve, 7 ...
Hot water supply line, 8: faucet, 9: drain line, 10: safety valve, 11: drain line, 12: reheating command generator, 1
b: hot water tank, 1c: main heater, 1d: first temperature sensor, 1e: heat exchanger, 1f: heater for reheating,
1g: second temperature sensor, 1h: water heater control setting device, 1m: heater power supply control device, 3b: control circuit, 3e
... Remote controller.

Claims (2)

(57) [Scope of request for utility model registration] 1. A menu arranged in the lower region of the hot water tank
In-heater and heat located in the upper area of the hot water tank
An exchanger and the heat in the upper region in the hot water tank.
Reheating heater located below the exchanger
And a control command including a reheating command according to the setting
Water heater control setting device, the main heater and
Controls energization of the heating heater and inputs a reheating command.
If the reheating is performed according to the specified control mode,
And a heater energization control device for energizing the heater
Heat exchange between hot water supplied from the hot water storage type electric water heater and the hot water supply water heater.
Temperature of hot water circulation type bath equipment reheated and used by a water heater
Water circulation utilization equipment, detecting whether the hot water circulation utilization equipment is in the operating state
When the operating state is detected, the reheating command is supplied to the heater.
And a reheating control command generator for outputting to the control device, wherein the heater energization control device includes the water heater control setting device and
And the reheating command from any of the reheating command generators
A circulation type hot water utilization device characterized in that it is configured to be able to input an instruction . 2. The hot water storage type electric water heater includes a temperature sensor that measures a hot water temperature in the upper region in the hot water tank in order to obtain information for determining stop of energization to the reheating heater. The circulating hot water utilization device using a hot water storage type electric water heater according to claim 1, wherein the device is provided on an upper wall portion of the hot water tank located above the heat exchanger.