JP2004309055A - Instant water heater - Google Patents

Abstract

The present invention realizes an instant hot water supply apparatus in which hot water is immediately supplied from a hot water supply outlet by heating using a bath hot water circuit using a one-can two-water heat exchanger as a heating source.
A circulating water heating circuit (13) for reheating a bath tub, a main heat exchange device (11) that is a one-can-two-water heat exchanger including a hot-water supply heating circuit (12) in one can body, and water in a bath tub (21). Pump 19, a pressure relief device 24, a bypass circuit 40 connecting a bath going circuit and a bath returning circuit in the apparatus, an external input device 31, and control means 32, and a circulating water heating circuit 13 Is circulated through the bathtub 21 or the bypass circuit 40 by the circulation pump 19, and the hot water in the hot water supply and heating circuit 12 is quickly and kept at a certain temperature or higher, so that an instant hot water supply function can be realized with a simple configuration.
[Selection diagram] Fig. 1

Description

[0001]
TECHNICAL FIELD OF THE INVENTION
The present invention relates to an instant hot water supply apparatus in which hot water is immediately discharged from a hot water supply outlet by heating using bath hot water using a one-can two-water heat exchanger as a heating source.
[0002]
[Prior art]
This type of conventional instant hot water supply apparatus is realized by using a two-can two-water heat exchanger having two heat sources, a hot water supply heat source and a heating heat source, separately (for example, see Patent Document 1). .
[0003]
FIG. 7 shows a conventional instant hot water supply apparatus described in the above publication. As shown in FIG. 7, the heat source means 1 for hot water supply and heating is used as a heat source, control of circulating hot water through the heating line 3 by the heating line opening / closing valve 2 is performed, and the temperature sensor 6 is attached to the heat retaining container 5 with the heat exchanger 4. A primary tapping line 7 and a secondary tapping line 8 are provided before and after the heat retaining container 5.
[0004]
[Patent Document 1]
JP-A-10-176836 (paragraph 0002-0021, FIG. 1)
[0005]
[Problems to be solved by the invention]
However, in the above-mentioned conventional instant hot water supply apparatus, the heat source means 1 for hot water supply and heating must be used, and two heat exchangers, which are heat source means having a hot water supply function and a heating function, must be separately provided, so that the main body itself becomes large. At the same time, since the hot water supply / heating circuit is not heated until the curan is opened, there is a problem that the temperature of the hot water is fluctuated due to cold water flowing out of the heat source outlet and mixing of hot water and cold water in the warming device.
[0006]
An object of the present invention is to provide an instant hot water supply apparatus that shortens the time required to reach a hot water temperature of a heat source itself and that always operates immediately regardless of conditions such as presence or absence of bathtub water.
[0007]
[Means for Solving the Problems]
In order to solve the conventional problems, the instant hot water supply apparatus of the present invention is provided with heating means for simultaneously heating the hot water supply heating circuit and the circulating water heating circuit with one heat source, and heats the circulating water heating circuit with this heating means. By circulating the hot water with the circulation pump, an instant hot water supply device that simultaneously heats the hot water supply heating circuit of the main heat exchange device can be realized. In addition, a bypass circuit in the equipment is provided in the circulation heating circuit, and the hot water to be circulated is always kept in the equipment, so that the hot water supply heating circuit of the main heat exchanger is simultaneously heated even when the bathtub water is empty even when it is empty. Can be realized.
[0008]
BEST MODE FOR CARRYING OUT THE INVENTION
The instant hot water supply apparatus according to claim 1 of the present invention comprises: a main heat exchange apparatus in which two circuits, a hot water supply heating circuit and a circulating water heating circuit, are joined with a heat transfer relationship with each other; and a heating means for heating the main heat exchange apparatus. A hot water supply heating circuit, a circulating pump that circulates hot water of the circulating water heating circuit, a bath water going circuit that flows when the circulating water goes to the bathtub, a bath water return circuit that flows when returning from the bathtub, and the bath water going circuit. A bypass circuit connected in the middle of the bath water return circuit, and provided for heating the circulating water heating circuit by a heating means when the circulating water heating circuit is at a predetermined temperature or less, and for releasing the pressure-raised water of the hot water supply heating circuit to the circulating water heating circuit side. Pressure release means, check means for preventing water in the circulating water heating circuit from flowing back to the hot water supply heating circuit, control means for operating the circulation pump, and an external input device capable of controlling the control means.
[0009]
With the above configuration, when the temperature of the circulating water heating circuit is equal to or lower than the predetermined temperature, the circulating water heating circuit of the main heat exchanger is heated by the heating unit. When hot water in the heated circulating water heating circuit is circulated by the circulating pump, the hot water supply heating circuit in the main heat exchange device is simultaneously heated. At that time, the heated circulating water partially passes through the bypass circuit, is mixed with the circulating water returned from the low-temperature bath water, returns to the bath water return circuit, returns to the circulating water heating circuit, and exchanges main heat. Heating of the hot water supply heating circuit in the device is accelerated, and bathtub water is not heated more than necessary.
[0010]
Then, when the curan is opened for hot water supply, the heated hot water in the hot water supply heating circuit is immediately discharged. That is, when hot water is supplied to the bathtub by the input of the external input device, the hot water of the circulating water heating circuit is circulated by the bypass circuit without providing a large functional component in a general one-can two-water heat exchanger. It is possible to realize an instant hot water supply device capable of supplying hot water at a constant temperature from the beginning with energy consumption.
[0011]
According to a second aspect of the present invention, in the instant hot water supply apparatus according to the first aspect, the circulation is performed only by the bypass circuit regardless of the presence or absence of water in the bathtub, and the circulation pump is operated. By keeping the hot water temperature at or above a certain temperature, it is possible to realize an instant hot water supply apparatus capable of tapping at a constant temperature from the beginning even when there is no water in the bathtub.
[0012]
According to a third aspect of the present invention, in the instant hot water supply apparatus of the second aspect, a bypass valve for opening and closing a bypass circuit is provided, and the bypass valve is opened when the circulating water heating circuit for instant hot water supply is heated. By circulating the water in the bypass circuit, the water can be heated quickly, and when the original bath water is heated, the bypass valve is closed to realize an instant hot water supply device capable of hastening the heating of the bath water.
[0013]
According to a fourth aspect of the present invention, in the instant hot water supply apparatus of the second aspect, the circulating water heating circuit and the bypass circuit are “opened” at a position branched from the bypass circuit of the bath water outflow circuit, and the bathtub outflow side is “open”. When `` closed '', the circulation water heating circuit and the bathtub side are `` open '', and the bypass side is `` closed ''. The three-way valve bath valve and the bath water return circuit circulates at the position where it joins the bypass circuit. Bath return of three-way valve with water heating circuit and bypass circuit open and bathtub outgoing side closed, and circulating water heating circuit and bathtub side open and bypass side closed. A valve 45 is provided to operate the circulation pump when certain conditions are satisfied, to keep the hot water temperature in the hot water supply circuit at a certain temperature or higher.
[0014]
Then, by heating the bathtub water by circulating only the bypass circuit under the control of the two valves, when the original bathtub water is heated, the bypass valve is closed and the bathtub water can be heated more quickly. Can be realized.
[0015]
According to a fifth aspect of the present invention, in the instant hot water supply apparatus of the first aspect, when it is determined that there is no bath water by the detection of the circulating water detecting means, the hot water valve is opened and the hot water is supplied to the circulating water heating circuit. , A circulating pump is operated, and even if there is no water in the circulating water heating circuit, it is possible to realize an instant hot water supply apparatus capable of supplying hot water at a constant temperature from the beginning.
[0016]
According to a sixth aspect of the present invention, in the instant hot water supply apparatus of the first aspect, a water level sensor for detecting the presence or absence of bathtub water is provided in the circulating water heating circuit to detect the presence or absence of bathtub water before operating the circulation pump. By operating the circulating pump, the water in the hot water supply heating circuit can be quickly heated to realize a hot water supply device capable of tapping at a constant temperature from the beginning by operating the circulation pump. is there.
[0017]
【Example】
Hereinafter, embodiments of the present invention will be described with reference to the drawings.
[0018]
(Example 1)
FIG. 1 is a system configuration diagram of the instant hot water supply apparatus of Embodiment 1 of the present invention. In FIG. 1, reference numeral 10 denotes a gas hot-water bath installed outdoors or the like, and a hot-water supply heating circuit 12 as a main heat exchange device 11 and a bath water heating circuit 13 as a circulating water heating circuit are integrally formed. The hot water supply bath 10 generates combustion heat in a burner 15 as heating means by fuel such as gas and combustion air from a fan 14, and heats and exchanges heat in a hot water supply heating circuit 12 and a bath water heating circuit 13. Water is supplied from the water inlet 16 to the hot water supply heating circuit 12, and after being heated, the hot water is supplied through the water outlet 17 from the hot water outlet or the shower head 18. On the other hand, the circulating hot water heated by the bath water heating circuit 13 passes through the bath water outflow circuit 20 by the circulation pump 19, reaches the bathtub 21, and returns from the bath water return circuit 22 to the hot water supply bath machine 10. Further, a bypass circuit 40 connecting the bath water outgoing circuit 20 and the bath water return circuit 22 is provided, and the bath water return circuit 22 is provided with a thermistor 23 for detecting the temperature of the hot water returned from the bathtub 21. Further, the water discharge passage 17 is provided with a pressure relief valve which is a pressure relief means for releasing pressure to the bath water return circuit 22 and a check valve 25 which is a check means for preventing backflow. Further, a control means 32 capable of controlling the circulating pump 19 and the like and an external input device 31 capable of controlling the control means are provided.
[0019]
In the instant hot water supply apparatus configured as described above, when hot water is supplied to the bathtub by the control means 32 based on the input of the external input device 31, the hot water in the hot water supply circuit is circulated by circulating the hot water in the circulating water heating circuit. Control is performed so as to keep it at a certain temperature or higher.
[0020]
First, the combustion air and gas sent by the fan 14 are mixed and burned by the burner 15 to heat the circulating water passing through the bath water heating circuit 13 provided in the main heat exchange device 11. The heated circulating water becomes hot water of about 60 ° C. to the bathtub 21 and is circulated by the circulating pump 19, and partly returns to the bath water heating circuit through the bypass circuit 40. At this time, the hot water in the hot water supply heating circuit 12 through which the other circuit of the main heat exchange device 11 passes is heated by the burner 15 and, at the same time, the hot water of the bath water heating circuit 13 is also heated. When the thermistor 23 of the bath water return circuit 22 becomes lower than a predetermined temperature, it is heated by the burner 15, and in the instant hot water supply operation, when the temperature becomes lower than the temperature of the bathtub temperature setting, the heating is stopped. When hot water is supplied from the hot water supply device, the hot water immediately heated at the device outlet of the hot water supply bath 11 flows out.
[0021]
In other words, with one main heat exchange device, there is no need to provide a hot water storage tank for hot water supply, and the bath tub is heated more efficiently than necessary. The instant hot water supply device can be provided at low running cost.
[0022]
(Example 2)
FIG. 2 is a configuration diagram of an instant hot water supply apparatus according to Embodiment 2 of the present invention. In FIG. 2, the point different from the configuration of the first embodiment is that the bath water valve 41 and the bath water return circuit 22 are merged with the bypass circuit 40 at a position after branching from the bypass circuit 40 of the bath water flow circuit 20. Is provided with a bath return valve 42, and the presence or absence of circulating water is detected by circulating water detecting means 47 for detecting the flow of water in the circulating water heating circuit. And the control means 33 for closing the bath return valve 42 and operating the circulation pump 19 is provided.
[0023]
In the instant hot water supply apparatus configured as described above, the control means 33 circulates the hot water of the circulating water heating circuit based on the input of the external input device 31 regardless of the presence or absence of bathtub water, so that the hot water of the hot water supply circuit is maintained at a certain temperature or higher. By controlling so that the hot water is supplied from the hot water bath 17 at the outlet of the hot water supply bath 11 when hot water is supplied from the hot water supply 17 or the like, an instant hot water supply device can be realized.
[0024]
(Example 3)
FIG. 3 is a configuration diagram of an instant hot water supply apparatus according to Embodiment 3 of the present invention. In FIG. 3, the difference from the configuration of the second embodiment is that a bypass valve 43 for opening and closing the bypass circuit 40 is provided.
[0025]
In the instant hot water supply apparatus configured as described above, based on the input from the external input device 31, the control means 34 closes the bypass valve 43 and opens the bath going valve 41 and the bath return valve 42 at the time of normal bath water purging. By operating the circulation pump 19, the circulation amount of the bathtub water is ensured, and the water is quickly driven out. When keeping the hot water supply circuit warm, the control means 34 opens the bypass valve 43, closes the bath access valve 41 and the bath return valve 42, and operates the circulating pump 19, so that the hot water in the hot water supply circuit is efficiently heated to a certain temperature or higher. And hot water is immediately heated at the outlet of the equipment of the hot water supply bath 11 when hot water is supplied from the hot water bath 17 or the like, thereby realizing an instant hot water supply apparatus.
[0026]
(Example 4)
FIG. 4 is a configuration diagram of an instant hot water supply apparatus according to Embodiment 4 of the present invention. In FIG. 4, the difference from the configuration of the third embodiment is that the bath access valve 41 and the bath return valve 42 are three-way valves, and the bypass valve 43 for opening and closing the bypass circuit 40 is omitted.
[0027]
In the instant hot water supply apparatus configured as described above, the number of valves to be controlled can be reduced, and by operating the circulation pump 19, the circulating amount of bathtub water is ensured, the water is quickly driven out, and the hot water supply circuit is kept warm. When hot water is supplied from the hot water supply bath 17, the hot water in the hot water supply circuit 17 is immediately heated at the outlet of the hot water supply bath 11 when hot water from the hot water supply circuit 17 is discharged. It is possible to realize an instant hot water supply device in which the supplied hot water is discharged immediately.
[0028]
(Example 5)
FIG. 5 is a configuration diagram of an instant hot water supply apparatus according to Embodiment 5 of the present invention. In FIG. 5, the difference from the configurations of Embodiments 2 to 4 is that when it is determined by the detection of the circulating water detecting means 47 that there is no bath water, the hot water valve 50 is opened, and hot water is supplied to the circulating water heating circuit 13. Is provided with a control means 36 for pouring a predetermined amount of water.
[0029]
In the instant hot water supply apparatus configured as described above, if there is no circulating water in the circulating water heating circuit 13, the circulating water is filled in the circulating water heating circuit 13, and then the circulating pump 19 is operated to surely supply hot water. The hot water in the circuit can be maintained at a certain temperature or higher, and when hot water is supplied from the hot water or the like 17, it is possible to realize an instant hot water supply device in which hot water is immediately heated at the outlet of the hot water supply bath 11.
[0030]
(Example 6)
FIG. 6 is a configuration diagram of an instant hot water supply apparatus according to Embodiment 6 of the present invention. 6, the difference from the configuration of the first embodiment is that the circulating water heating circuit 13 is provided with a water level sensor 46 for detecting the presence or absence of bathtub water.
[0031]
In the instant hot water supply device configured as described above, the presence or absence of bathtub water is detected before the circulation pump is operated, and by preventing the drainage of water from the circulation water heating circuit, the hot water in the hot water supply circuit is quickly maintained at a certain temperature or higher. When hot water is supplied from the hot water bath 17 or the like, hot water immediately heated at the outlet of the hot water supply bath 11 can be provided.
[0032]
【The invention's effect】
As is clear from the above description, according to the instant hot water supply apparatus of the present invention, without providing a large functional component, regardless of the presence or absence of hot water in the bathtub water, an instant hot water supply apparatus capable of tapping at a constant temperature from the beginning can be provided. realizable.
[Brief description of the drawings]
FIG. 1 is a system configuration diagram of an instant hot water supply device according to a first embodiment of the present invention; FIG. 2 is a system configuration diagram of an immediate hot water supply device according to a second embodiment of the present invention; FIG. FIG. 4 is a system configuration diagram of an instant hot water supply device according to a fourth embodiment of the present invention. FIG. 5 is a system configuration diagram of an immediate hot water supply device according to a fifth embodiment of the present invention. FIG. 6 is a sixth embodiment of the present invention. FIG. 7 is a system configuration diagram of a conventional instant hot water supply system.
DESCRIPTION OF SYMBOLS 11 Main heat exchange apparatus 12 Hot water supply heating circuit 13 Circulating water heating circuit 15 Heating means 19 Circulating pump 24 Pressure relief means 25 Non-return means 31 External input device 32 Control means 40 Bypass circuit 41 Bath access valve 42 Bath return valve 47 Circulating water detection means

Claims (6)

A main heat exchange device in which two circuits, a hot water supply heating circuit and a circulating water heating circuit, are joined with a heat transfer relationship with each other; heating means for heating the main heat exchange device; the hot water supply heating circuit; A circulating pump for circulating hot water in the circuit, a bath water flowing circuit that flows when the circulating water goes to the bathtub, a bath water return circuit that flows when returning from the bathtub, and a midway between the bath water going circuit and the bath water returning circuit. A bypass circuit, and a pressure release means provided for heating the circulating water heating circuit by the heating means when the temperature is equal to or lower than a predetermined temperature, and releasing the water whose pressure has increased in the hot water supply heating circuit to the circulating water heating circuit side. A non-return means for preventing water of the circulating water heating circuit from flowing back to the hot water supply heating circuit, a control means for operating the circulating pump, and an instant hot water supply apparatus provided with an external input device capable of controlling the control means . Operate the bath pump in a position after branching off from the bypass circuit in the bath water return circuit, the bath return valve in a position just before merging with the bypass circuit in the bath water return circuit, and the circulation pump when certain conditions are satisfied. 2. The instant hot water supply apparatus according to claim 1, further comprising control means for controlling opening and closing of the bath outflow valve and the bath return valve in response to detection by the circulating water detection means. 3. An immediate valve according to claim 1, further comprising a bypass valve for opening and closing the bypass circuit, and a control means for operating the circulation pump when certain conditions are satisfied, and controlling opening and closing of the bath outflow valve, bath return valve and bypass valve. Water heater. When the circulating water heating circuit and the bypass circuit are `` open '' at the position branched from the bypass circuit of the bath water going circuit, and the bathtub going side is `` closed '', and the circulating water heating circuit and the bathtub side are `` open '', Set the circulating water heating circuit and bypass circuit to "open" at the position where the bypass side is closed with the three-way valve bath valve and the bypass circuit for the bath water return circuit, and close the bathtub side. When the circulating water heating circuit and the bathtub side are `` open '' and the bypass side is `` closed '', the three-way valve bath return valve and the circulating pump are operated, and the bath outgoing valve and bath return valve 2. The instant hot water supply apparatus according to claim 1, further comprising control means for controlling an opening / closing position. A circulating water detecting means for detecting a flow of water in the circulating water heating circuit is provided.When a certain condition is satisfied, a circulating pump is operated, and when the circulating water detecting means determines that there is no bathtub water, Open the hot water valve, fill the circulating water heating circuit with a fixed amount of hot water, control the bath outflow valve and the bath return valve, and configure the circulating water to circulate only in the bypass circuit, 3. The instant hot water supply apparatus according to claim 1, further comprising control means for operating the circulation pump. 6. A circulating water heating circuit comprising: a water level sensor for detecting the presence or absence of bathtub water; and control means for controlling a bath outflow valve and a bath return valve in accordance with the detection of the water level sensor to operate a circulation pump. The instant hot water supply device as described.

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