JP2007003023A - Storage water heater - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a storage water heater capable of heating bathtub water to a set temperature even in a case when reheating is performed in a state that a person stays in the bathtub. <P>SOLUTION: This storage water heater comprises a storage tank 2, a stored hot water/water circulating circuit 6, a heat exchanger 7 for exchanging heat between the stored hot water/water and the bathtub water, a bathtub water circulating circuit 11, a bathtub water circulation inlet sensor 15b and a bathtub water circulation outlet sensor 15c respectively detecting temperatures of the bathtub water at an inlet side and an outlet side of the heat exchanger 7, a circulation flow rate adjustment valve 9 for adjusting a circulation flow rate of the stored hot water/water, and a control portion 50 calculating a temperature rise time to achieve a hot water tapping set temperature on the basis of the temperature detected by the temperature detecting means, a set hot water amount for tapping hot water, set by a remote controller 60, a hot water tapping set temperature, and reheating capacity, and stopping the temperature rising operation when the temperature rise time has passed, and a temperature of the bathtub water detected by the temperature detecting means becomes higher than the hot water tapping set temperature. <P>COPYRIGHT: (C)2007,JPO&INPIT

Description

  The present invention relates to a hot water storage type hot water heater, and relates to a hot water storage type hot water heater having a bathtub pursuit function.

  The conventional hot water storage water heater with bathtub reheating function operates the circulation pump when reheating the bathtub, heats the bathtub water with a heat exchanger, and stops reheating when the temperature of the bathtub water reaches the set temperature. (For example, refer to Patent Document 1).

JP 09-133403 A (paragraphs 0024 to 0049, FIGS. 1 and 2)

  Conventional hot water storage water heaters usually have reheated bathtub water all over the tub, but when reheating with a person in the tub, the reheated bathtub water is distributed throughout the tub. There was a problem that the chasing stopped before the temperature of the bath water rose to the set temperature without reaching.

  The present invention has been made to solve the above-described problems, and is a hot water storage type hot water supply capable of raising the temperature of the bath water to a set temperature even when reheating is performed in a state where there is a person in the bathtub. The purpose is to provide a machine.

  A hot water storage type water heater according to the present invention includes a hot water storage tank for storing hot water to be discharged therein, a heating means for heating the hot water stored in the hot water storage tank, and an interior of the hot water storage tank heated by the heating means. A hot water circulation circuit having a hot water circulation pump that circulates the stored hot water outside the hot water storage tank, a bathtub water circulation circuit having a bathtub water circulation pump that circulates bathtub water inside the bathtub to the outside of the bathtub, and the hot water circulation circuit A heat exchanger for pursuing the bath water by exchanging heat from the hot water circulating through the bath water to the bath water circulating through the bath water circulation circuit, and the temperature of the bath water before and after the heat exchange of the heat exchanger The bath water temperature detecting means for detecting the temperature of the bath water before and after the heat exchange of the heat exchanger detected by the bath water temperature detecting means and the bath water circulation circuit are circulated. The reheating capacity for bath water determined from the circulation flow rate of bath water, the temperature of the bath water before heat exchange of the heat exchanger detected by the bath water temperature detecting means at the start of reheating for bath water is set Based on the hot water setting amount and the hot water setting temperature of the bathtub, the heat exchanger chases the bath water to determine the temperature rising time for raising the temperature, and the temperature raising time has elapsed since the start of the heating. And when the temperature of the bath water before the heat exchange of the heat exchanger detected by the bath water temperature detecting means exceeds the hot water set temperature, the heat conversion from the stored hot water to the bath water is stopped. And a control means for controlling.

  In the hot water storage type water heater according to the present invention, the control unit has a bath tub from the temperature of the bath water detected by the bath water temperature detecting means, the hot water set amount and hot water set temperature set by the remote controller, and the reheating capability. When the temperature rise time until the water temperature rises to the hot water set temperature is calculated, the temperature rise time has elapsed, and the temperature of the bath water detected by the bath water temperature detection means exceeds the hot water set temperature Since the temperature raising operation is controlled to be stopped, it is possible to raise the temperature of the bathtub water to the set temperature even when a chasing operation is performed with a person in the bathtub, and the usability is improved.

Embodiment 1 FIG.
FIG. 1 is a configuration diagram of a hot water storage type water heater in Embodiment 1 for carrying out the present invention, FIG. 2 is a control flowchart in Embodiment 1 of the present invention, and FIG. 3 is when a person is in the bathtub. It is explanatory drawing which shows a mode that the bathtub water chased is circulating in the bathtub. In FIG. 1, a hot water storage tank 2 is disposed in a hot water supply body 1, and a heating element 4 as a heating means for heating the hot water stored in the hot water storage tank 2 is attached to the hot water storage tank 2. A water supply pipe 3 is connected to the lower part of the hot water storage tank 2. A pressure reducing valve 3 a is provided in the water supply pipe 3, and a hot water supply pipe 5 is connected to the upper part of the hot water storage tank 2.

  A relief valve 5 a is provided in the hot water supply pipe 5, and a hot water storage water circulation circuit 6 is connected to the upper and lower parts of the hot water storage tank 2. The hot water circulation circuit 6 is a heat exchanger 7 for exchanging heat between hot water stored in the hot water storage tank 2 and hot water in the bathtub 10, and a hot water circulation pump for circulating hot water in the hot water storage tank 2 to the hot water circulation circuit 6. It comprises a circulation flow rate adjusting valve 9 that adjusts the circulating flow rate of hot water passing through the recirculation circulation pump 8 and the hot water storage circuit 6. The bathtub water circulation circuit 11 is connected to the bathtub 10, and this bathtub water circulation circuit 11 is the bathtub circulation circuit 11a, the bath water circulation pump 12 which circulates the bathtub water, the heat exchanger 7, and the bathtub water return circulation circuit 11b. It consists of

  Boiling temperature sensors 14a and 14b for detecting the temperature of the hot water inside are attached to the outer surface of the hot water storage tank 2 at a predetermined interval. The hot water circulating circuit 6 is provided with a hot water circulating inlet sensor 15 a that is provided on the inlet side of the heat exchanger 7 and detects the bath inlet temperature of the hot water. Further, the bathtub water circulation circuit 11 is provided on the inlet side of the heat exchanger 7 and is a bathtub water temperature detecting means for detecting an outlet temperature from the bathtub water 10 (temperature of the bathtub water before heat exchange). A water circulation inlet sensor 15b and a bathtub water circulation outlet sensor which is provided on the outlet side of the heat exchanger 7 and is a bath water temperature detecting means for detecting an inlet temperature from the bathtub 10 (temperature of the bathtub water after heat exchange). 15c is attached.

  The control unit 50 serving as a control device includes a determination unit that determines whether or not a temperature detected by the bathtub water circulation outlet sensor 15c has reached a predetermined temperature T2, which will be described later, and a storage unit that stores setting values such as the predetermined temperature T2. It also has a timer function. Further, the heater 4 receives the signals from the boiling temperature sensors 14a and 14b and the bath water circulation inlet sensor 15b, and based on the settings of the remote control 60 provided with the hot switch 60a and other switches, the heating element 4 and the bath circulation pump. 12, the recirculation circulation pump 8, the circulation flow rate adjustment valve 9 and the like are controlled.

  Here, depending on the adjustment of the circulating flow rate adjusting valve 9, the circulating flow rate of the hot water circulating circuit 6 increases or decreases, and the heating capacity for heating the bathtub 10 changes. When the circulating flow rate adjusting valve 9 is fully opened, the heating capacity is maximum, and when the circulating flow rate of the hot water storage circuit 6 is reduced, the heating capacity decreases, but the hot water temperature returned to the bathtub 10 can also be lowered.

  Next, the operation of the first embodiment configured as described above will be described with reference to FIG. The power supply is turned on to the main body 1 of the water heater, and the circulation flow rate adjusting valve 9 is fully opened until the control is started. The water supplied from the water supply pipe 3 is reduced to a predetermined pressure by the pressure reducing valve 3 and is stored in the hot water storage tank 2. Water is supplied, and the hot water storage tank 2 and the hot water circulation circuit 6 are filled with water.

When the power source is turned on, the hot water stored in the hot water storage tank 2 is heated to a temperature set by the remote controller 60 (for example, 90 ° C.). The boiling temperature is detected by boiling temperature sensors 14 a and 14 b attached to the hot water storage tank 2.
At this time, the circulation flow rate adjustment is performed immediately after the start of boiling, after the elapse of a predetermined time (for example, 1 hour) from the start of boiling, or after the predetermined temperature (for example, 45 ° C.) is detected by the boiling temperature sensors 14a and 14b. Even if the valve 9 is fully closed, the hot water tank 2 and the hot water circulation circuit 6 are filled with water, and there is no air in the hot water circulation circuit 6, so that the first chasing operation can be performed normally.

Thereafter, since the circulation flow rate adjusting valve 9 is fully closed, the hot water circulation circuit 6 is shut off, and the hot water in the hot water storage tank 2 does not convect to the hot water circulation circuit 6, so that the heat exchanger 7 does not become hot and bath water Hot water does not come out in bathtub 10 at the start of chasing operation. In addition, the expansion water of the hot water storage tank 2 at the time of boiling is discharged | emitted from the relief valve 5a.
In addition, when hot water is supplied to a general faucet or the like, hot water is supplied through the hot water supply pipe 5 by the water source water pressure by opening the faucet, and water is supplied from the water supply pipe 3 to the lower part of the hot water storage tank 2.

  The above operation will be described in more detail with reference to the flowchart of FIG. In step S1, it is determined whether or not the hot switch 60a of the remote controller 60 has been pressed. Here, if it is determined that the hot switch 60a has been pressed, the bath circulation pump 12 is operated (step S2). And the measurement of the elapsed time t1 after the bath circulation pump 12 started operation | movement is started (step S3). In step S4, it is determined whether or not elapsed time t1 ≧ predetermined time ta. As a result, if elapsed time t1 ≧ predetermined time ta, timer 1 that measures elapsed time t1 is cleared (step S5).

  For example, for a predetermined time ta, the bath water in the bathtub 10 is stirred by the operation of the bath circulating pump 12 to make the temperature uniform, and the temperature of the bath water in the bathtub 10 after the temperature is made uniform is the bathtub temperature. The time for reliably reaching the water circulation inlet sensor 15b (for example, 60 seconds) is set. Step S6 stores the detected value of the bath water circulation inlet sensor 15b as the initial water temperature T. This initial water temperature T is the temperature of the bath water that requires reheating, and is, for example, 35 to 40 ° C.

In step S7, a tracking time tb is calculated. First, the detection value of the bathtub water circulation inlet sensor 15b is Tci [° C.], the detection value of the bathtub water circulation outlet sensor 15c is Tco [° C.], the circulation flow rate by the bath circulation pump 12 of the bathtub water circulation circuit 11 is G [L / min], The tracking ability is defined as H [KJ / sec]. The circulation flow rate G by the bath circulation pump 12 is fixed at 10 [L / min] with a standard length (for example, 5 m5 bent) of the pipe from the hot water supply body 1 to the bathtub 10. The tracking ability H is obtained by the following formula (1).
H = (Tco−Tci) × G × 4.186 / 60 (1)

Next, the amount of hot water set by the remote controller 60 is defined as L [L], the hot water set temperature is defined as Ts [° C.], and the initial water temperature T [° C.] and the tracking ability H [KJ / sec] The predetermined time tb (chase time) [hr] is obtained by the following equation (2). The hot water filling set temperature Ts is, for example, around 42 ° C.
tb = L × (Ts−T) / 860 × H (2)
In step S8, the circulating flow rate adjusting valve 9 for adjusting the circulating flow rate of hot water passing through the hot water circulating circuit 6 is opened to the initial opening (for example, half of the fully opened position). Next, the chasing circulation pump 8 is operated to start chasing (step S9). And the measurement of the elapsed time t2 after the recirculation circulation pump 8 starts operation | movement is started (step S10).

  Step S11 determines whether the temperature of the hot water heat-exchanged by the heat exchanger 7 is a predetermined temperature T2 (for example, 55 ° C.) based on the detection value of the bathtub water circulation outlet sensor 15c. If the detection value of the bath water circulation outlet sensor 15c is not the predetermined temperature T2, the opening of the circulation flow rate adjusting valve 9 is controlled to adjust the circulating flow rate of the hot water and the temperature of the hot water exchanged by the heat exchanger 7 is predetermined. The temperature is set to T2 (step S12).

  In step S13, whether or not the elapsed time t2 ≧ the reheating time tb and the temperature of the bathtub water in the bathtub 10 is equal to or higher than the hot water set temperature Ts set by the remote controller 60 is determined based on the detected value of the bathtub water circulation inlet sensor 15b. . If both conditions are satisfied, the timer 2 for measuring the elapsed time t2 is cleared (step S14), the recirculation circulation pump 8 is stopped, the circulation flow rate adjusting valve 9 is fully closed, the bath circulation pump 12 is stopped and renewal is performed. The operation is stopped (step S15). If both conditions are not satisfied, the chasing operation is continued.

Since the hot water storage type water heater shown in 1 of the above-described embodiment operates as described above, the bath water is raised to the set temperature even when chasing with a person in the bathtub as shown in FIG. It is possible to provide an easy-to-use hot water storage type water heater that can be heated.
In the first embodiment, the amount of heat exchange from the hot water to the bath water is controlled by changing the amount of hot water circulated in the hot water circulation circuit 6, but the circulation flow rate is constant. The temperature of the hot water may be changed. Further, the heat exchange amount may be controlled by the heat exchanger 7 itself. For example, in the heat exchanger 7, the area of the portion where heat exchange is performed between the pipe through which the hot water is flowing and the pipe through which the bathtub water flows is changed, or a heat insulating material is inserted between the pipes to change the insertion area. Or changing the distance between the two.

Embodiment 2. FIG.
In the above description, the circulation flow rate G by the bath circulation pump 12 is fixed at 10 [L / min] with a standard length (for example, 5 m5 bent) of the pipe from the hot water supply body 1 to the bathtub 10. Alternatively, the circulation flow rate G may be set from the remote controller 60 which is a setting means for setting the circulation flow rate of the bath water according to the length of the pipe. Specifically, the control unit 50 is provided with a circulation flow rate table in which the circulation flow rate is preset according to the length of the piping of the bathtub water circulation circuit 11, and the remote controller 60 circulates corresponding to the length of the piping of the bathtub water circulation circuit 11. The flow rate G can be selected.
The circulation flow rate G according to the length of the pipe is, for example, 12 [L / min] when the pipe length is 3 m, 10 [L / min] when the pipe length is 5 m, 8 [ L / min] and 6 [L / min] when the pipe length is 15 m.

  In such a configuration, it is possible to provide an easy-to-use hot water storage type hot water heater that can improve the accuracy of the reheating time and can reliably raise the temperature of the bath water to the set temperature.

BRIEF DESCRIPTION OF THE DRAWINGS It is a block diagram of the hot water storage type water heater which shows Embodiment 1, 2 of this invention. 3 is a flowchart of the operation of the hot water storage type hot water heater showing Embodiment 1; It is explanatory drawing of the state which the bathtub water of the hot water storage type water heater which shows Embodiment 1, 2 of this invention is circulating in the bathtub.

Explanation of symbols

DESCRIPTION OF SYMBOLS 1 Main body of a water heater, 2 Hot water tank, 6 Hot water circulation circuit, 7 Heat exchanger, 8 Recirculation circulation pump which is a hot water circulation pump, 9 Circulation flow control valve, 10 Bath, 11 Bath water circulation circuit, 12 Bath water circulation pump Bath circulation pump, 15b Bath water circulation inlet sensor as bathtub water temperature detection means, 15c Bath water circulation outlet sensor as bathtub water temperature detection means, 50 controller, 60 Remote control as setting means, 60a Hot switch.

Claims (2)

A hot water storage tank for storing hot water stored in the hot water,
Heating means for heating hot water stored in the hot water storage tank;
A hot water circulating circuit having a hot water circulating pump for circulating hot water stored in the hot water tank heated by the heating means to the outside of the hot water tank;
A bathtub water circulation circuit having a bathtub water circulation pump for circulating bathtub water inside the bathtub to the outside of the bathtub;
A heat exchanger for pursuing the bathtub water by exchanging heat from the hot water circulating in the hot water circulation circuit to the bathtub water circulating in the bathtub water circulation circuit;
Bathtub water temperature detecting means for detecting the temperature of the bathtub water before and after heat exchange of the heat exchanger;
The reheating ability for the bath water determined from the temperature of the bath water before and after the heat exchange of the heat exchanger detected by the bath water temperature detecting means and the circulation flow rate of the bath water circulating in the bath water circulation circuit, Based on the temperature of the bath water before the heat exchange of the heat exchanger detected by the bath water temperature detecting means at the start of reheating with respect to the bath water, the hot water set amount and the hot water set temperature of the bathtub set The heat exchanger determines a temperature rising time during which the bath water is chased to raise the temperature, and the temperature raising time has elapsed since the start of chasing, and the heat exchange detected by the bath water temperature detecting means When the temperature of the bath water before the heat exchange of the vessel exceeds the hot water set temperature, control means for controlling to stop the heat conversion from the hot water to the bath water,
A hot water storage type water heater characterized by comprising There is a circulation flow rate table in which the circulation flow rate of the bathtub water circulating in the bathtub water circulation circuit is preset according to the length of the piping of the bathtub water circulation circuit, and the bathtub water corresponding to the length of the piping of the bathtub water circulation circuit The hot water storage type hot water heater according to claim 1, further comprising setting means for selecting and setting a circulating flow rate from the circulating flow rate table.

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