JP2001289504A - One-can two-channel hot-water supplier for bath - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a highly safety one-can two-channel hot-water supplier for bath which can be used for hot water supply without anxiety even when a boiling preventing sensor detects boiling. SOLUTION: This one-can two-channel hot-water supplier for bath is provided with an ignition delaying means which delays the ignition of a burner by a prescribed period of time when the boiling preventing sensor detects a fixed temperature and, in addition, the hot-water supplier is used for hot water supply within a fixed period of time after the detection.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a one-can, two-channel water heater using gas, oil, and electricity as fuel and heat sources. Specifically, a bath heat exchanger connected to a bathtub through a circulation circuit having a circulation pump, a hot water supply heat exchanger that shares the bath heat exchanger and a heat absorption fin, and heats both heat exchangers The present invention relates to an improvement of a so-called one-can-two-channel type bath water heater having a burner.

[0002]

2. Description of the Related Art Conventionally, in this kind of one-can, two-channel bath water heater, it is possible to use a bath alone, a hot water alone, or a combination of a bath and a hot water supply. When the bath is used alone, the bathtub water is forcibly circulated by the circulation pump, and the burner provided below the heat exchanger is ignited to heat the heat exchanger. The bath was going to boil.

[0003]

However, in a one-can, two-channel hot water supply system, the fin of the bath heat exchanger and the fin of the hot water supply heat exchanger are constituted by a common heat-absorbing fin. Therefore, when the bath is used alone, there is a problem that not only the bath heat exchanger side but also the hot water supply heat exchanger side is heated, and the hot water in the water pipe of the staying hot water supply heat exchanger boils. Was. In order to solve this problem, in the related art, a boiling prevention thermistor is provided in a water pipe of a heat exchanger for hot water supply, and when the boiling prevention thermistor detects boiling, combustion of a burner is stopped. However, immediately after the boiling prevention thermistor detects boiling, when the hot water supply side, for example, a shower is used, the temperature of the shower hot water to be discharged suddenly rises due to the residual heat energy due to the heat mass of the heat exchanger, and hot water is discharged. There was a problem of ejection.

SUMMARY OF THE INVENTION In view of the above problems, the present invention relates to a one-can, two-channel bath water heater having a boiling prevention sensor, which can safely use hot water even when the boiling prevention sensor detects boiling. It is an object of the present invention to provide a tall one-can-two-channel bath water heater.

[0005]

Means for Solving the Problems To solve the above-mentioned problems, a one-can, two-channel bath water heater of the present invention comprises a bath heat exchanger connected to a bathtub through a circulation circuit having a circulation pump; A hot water supply heat exchanger sharing the heat absorption fins with the bath heat exchanger, a burner for heating the heat exchanger, and a hot water supply heat exchanger provided in a water passage of the hot water supply heat exchanger. A boiling prevention sensor for preventing boiling of hot and cold water, and when the boiling prevention sensor detects a certain temperature and uses hot water supply within a certain time after the detection,
A first feature is that ignition delay means for delaying ignition of the burner for a predetermined time is provided. According to the first feature, even if hot water is used immediately after the water in the water pipe of the heat exchanger for hot water supply by using the bath alone is used, even if hot water is used, the burner is not immediately ignited by the ignition delay means. In this case, overshooting immediately after the start of hot water supply can be reduced.

Further, the one-can, two-channel bath water heater of the present invention shares a bath heat exchanger connected to a bathtub through a circulation circuit having a circulation pump, and shares the bath heat exchanger and heat absorption fins. A hot water supply heat exchanger, a burner that heats the heat exchanger, and a hot water supply temperature sensor that is provided in a water passage of the hot water supply heat exchanger and that is separately provided. And a boiling prevention sensor for preventing boiling of hot water in the inside, wherein when the boiling prevention sensor detects a certain temperature and when hot water supply is used within a certain time after the detection, the burner A second feature is that an ignition delay means for delaying the ignition for a predetermined time is provided.
According to the second feature, by using a dual sensor of the boiling prevention sensor and the tap water temperature sensor, in addition to the reduction of the overshoot, the outlet temperature of the hot water supply heat exchanger is still reduced even after the delay. When the temperature is high, the process immediately shifts to the feedback control, and the hot water discharge characteristics can be improved. Further, the one-can two-channel bath water heater according to the present invention is a bath heat exchanger connected to a bathtub through a circulation circuit having a circulation pump, and a hot water supply sharing the heat absorption fin with the bath heat exchanger. A heat exchanger, a burner that heats the heat exchanger, a tapping temperature sensor provided in a water passage of the hot water supply heat exchanger, a tapping temperature sensor, and a heating safety sensor that operates during abnormal heating, and these sensors. A boiling prevention sensor that is separately provided to prevent boiling of hot water in the hot water supply heat exchanger, wherein the use of the hot water supply is performed when the boiling prevention sensor detects a certain temperature and within a certain time after the detection. The third feature is that an ignition delay means for delaying the ignition of the burner for a predetermined time when the ignition is performed is provided. According to the third feature, the triple sensor including the boiling prevention sensor, the tapping temperature sensor, and the heating safety sensor improves the overshoot and tapping characteristics, and also abnormally heats the hot water supply heat exchanger. Occasionally, the fuel supply to the burner is shut off, the combustion itself is stopped, and triple safety is achieved, which is extremely safe in use.

[0007]

Embodiments of the present invention will be described below with reference to the drawings. FIG. 1 is an overall configuration diagram of a one-can, two-channel bath water heater showing an embodiment of the present invention. FIG. 2 is a block diagram showing an embodiment of the present invention. FIG. 3 is a flowchart showing an embodiment of the present invention.

In FIG. 1, reference numeral 1 denotes a one-can, two-channel bath water heater, in which a heat exchanger 2 for hot water supply, a gas burner 3 provided therebelow, and a heat exchanger 4 for bath are provided. Reference numeral 5 denotes a heat absorbing fin shared by the hot water supply heat exchanger and the bath heat exchanger. The bath heat exchanger 4 is connected to a bathtub through a circulation circuit having a circulation pump to be described later.

A controller 6 comprising a microcomputer for controlling combustion is provided in the main body of the one-can-two-channel bath water heater 1. The controller 6 is connected to a remote controller, and usually operates the one-can-two-channel water heater using two remote controllers, a bath remote controller and a kitchen remote controller, from the viewpoint of convenience.

[0010] Reference numeral 10 denotes an inlet pipe to the hot water supply heat exchanger 2;
Reference numeral 1 denotes a tapping pipe from the hot water supply heat exchanger 2 to the hot water supply curan 7. The water inlet pipe 10 and the tap water pipe 11 constitute a water passage. The water inlet pipe 10 has a water amount sensor 13 for detecting the amount of water flowing from an upstream side thereof and a water temperature sensor 14 for detecting an incoming water temperature.
Is provided. A tap water temperature sensor 15 including a thermistor or the like as a temperature-sensing member for detecting the temperature of tap water heated by the hot water supply heat exchanger 2, a hot water supply heat exchanger, 2, a heating safety sensor 16 that operates at the time of abnormal heating is provided. Abnormal heating refers to a heating state higher than the temperature detected by a boiling prevention sensor to be described later, and means, for example, idle heating.

The gas pipe leading to the gas burner 3 is provided with a gas proportional valve 17 as a driving member for adjusting a gas passage. Reference numeral 18 denotes a bathtub provided in the bathroom, 19 denotes a circulation circuit of the one-can, two-channel bath water heater 1 connected to the bathtub 18, and a pressure sensor 20 for detecting a water level of the bathtub in the circulation path 19;
A circulation pump 21 is provided. Reference numeral 22 denotes a hot water supply pipe branched from the tapping pipe 11 and connected to the circulation circuit 19.
A solenoid valve 23 and a check valve 24 are provided on the way. Also,
The circulation circuit 19 is provided with a three-way valve 25, a drain valve 26, a bath temperature sensor 27, and a water flow switch 28.

Further, a bend prevention sensor 29 for preventing boiling of hot water in the hot water supply heat exchanger is provided at a bend portion of a meandering water pipe which is a water passage of the hot water supply heat exchanger 2.
Reference numeral 30 denotes a blower fan for blowing combustion air into the combustion chamber 31, and reference numeral 32 denotes a water amount control valve attached to a bypass pipe provided to bypass the heat exchanger 2 from the water inlet pipe 10.

FIG. 2 is a block diagram showing an embodiment of the present invention. The controller 6 of the one-can-two-channel bath water heater 1 includes the water temperature sensor 14 and the water amount sensor 1 described in FIG.
3, water quantity control valve 12, tap water temperature sensor 15, heating safety sensor 16, boiling prevention sensor 29, bath temperature sensor 27,
Water flow switch 28, gas solenoid valve 17, pressure sensor 2
0, an electromagnetic valve 23, a blower fan 30, a remote controller, and the like.

In addition to the program for controlling combustion, the controller 6 ignites the gas burner 3 when the boiling prevention sensor 29 detects a certain temperature and when hot water is used within a certain time after the detection. Is programmed for an ignition delay means 33 for delaying a predetermined time.

More specifically, the ignition delay means 33 detects the temperature rise when the hot water in the water pipe of the hot water supply heat exchanger 2 boils and the temperature rises. When the user opens the hot water supply curan 7 and performs a hot water supply operation within a certain time after the detection by
The water flow sensor 13 senses the water flow caused by the flow of water, and delays the fuel supply to the gas burner 3 for a predetermined time.

Next, the use state in the embodiment of the present invention will be described. First, in the case of using only the hot water supply alone, after setting the desired hot water temperature and turning on the switch of the remote controller, when the hot water supply cull 7 is opened, the water flow switch 13 detects a predetermined amount of water and sends a signal based on the water flow to the controller 6. An input signal is applied to the gas burner 3 to give an ignition signal to start combustion. The required heat amount is calculated based on the set temperature, the incoming water temperature, and the incoming water amount, and the gas amount is feedback-controlled based on the outgoing water temperature and the set temperature to obtain a desired hot water. can get.

Next, when the bath is used alone, the bath switch 18 is turned on by turning on a bath switch of a remote controller (not shown) after the bath is filled with hot water, and the circulating pump 21 is turned on, whereby the water flow switch 28 is turned on and the controller 6 is turned on. The gas burner 3 is ignited through the tub, and hot and cold water in the bathtub is supplied to the circulation pump 21
(Roha), it circulates through the circulation circuit 19 through the bath heat exchanger 4 and is reheated.

A countermeasure in the case where the hot water in the water pipe of the hot water supply heat exchanger 2 constituted by the shared fins during the reheating combustion will be specifically described with reference to the flowchart of FIG.

In FIG. 3, when the hot water in the hot water supply heat exchanger 2 boils during the additional heating of the bath (step S1), a boiling prevention sensor attached to the bend portion of the hot water supply heat exchanger 2 is used. 29 operates by detecting a constant temperature of the water pipe at the time of boiling (step S2).

When the boiling prevention sensor 29 detects a certain temperature of the hot water supply heat exchanger 2, a signal is input to the controller 6, and a microcomputer in the controller 6 outputs a command to shut off the gas valve to the gas burner 3. The additional burning of the bath is stopped (step S3).

Next, if the hot water is used within a certain time after the detection of a certain temperature by the boiling prevention sensor 29, that is, if the hot water supply curan 7 is opened (Yes in step S4), the hot water is still used. Since the temperature of the hot water in the water pipe of the heat exchanger 2 is high-temperature water, further heating of the gas burner according to the hot water supply instruction is not preferable, and there is a risk of burns if the shower operation is performed.

Therefore, in the present invention, if hot water is used within a certain time after the detection of a certain temperature by the boiling prevention sensor 29, the ignition of the gas burner 3 by the ignition delay means 33, that is, the gas valve, the gas proportional valve The opening and discharge ignition operations are delayed for a predetermined time (step S5).

In the above description, the term "within a certain period of time" means a period during which the temperature of the boiling water does not drop, which is approximately 30 minutes immediately after the detection, although there is a difference depending on the capacity of the heat exchanger. This is a concept that includes immediately after detection. The predetermined time may be a time required for the hot water in the water pipe of the hot water supply heat exchanger 2 to be replaced and cooled, and is usually several seconds. After a lapse of a predetermined time (in the case of YES in step S6), the gas burner 3 may be ignited to start hot water supply combustion (step S7). The counting of the certain time is performed by a counter in the microcomputer, and the detection is started by a detection signal of a certain temperature as a trigger. The counting of the predetermined time is started by a detection signal from the water amount sensor 13 as a trigger.
When the boiling prevention sensor 29 detects a certain temperature, the blower fan 30 may be driven to promote the cooling of the heat exchanger.

If the hot water is used after a certain period of time has elapsed after the detection of a certain temperature by the boiling prevention sensor 29, that is, if the hot water supply curan 7 is opened (No in step S4), the hot water in the water pipe is not used. Since the temperature is considered to have dropped, hot water supply combustion is started immediately without operating the ignition delay means 33. At this time, by providing the tap water temperature sensor 15 at the outlet of the heat exchanger 2 for hot water supply, when the outlet temperature is high, the gas proportional valve 17 is throttled by feedback control, so that unnecessary heating is prevented. Further, by providing a tapping temperature sensor 15 and a heating safety sensor 16 in addition to the boiling prevention sensor 29 in the water passage of the hot water supply heat exchanger 2, the overshoot, the tapping characteristics are improved, and the combustion itself is stopped during abnormal heating. It will be triple safe.

The above-described embodiment shows a preferred embodiment of the present invention, and the present invention is not limited to this, and various design changes can be made within the scope.
For example, in the above embodiment, a one-can two-channel water heater using gas as fuel has been described, but oil-fuel fuel may be used. Similarly, in the above-described embodiment, the case where the main body of the one-can-two-channel bath water heater and the remote controller are connected by wire is shown. However, it is of course possible to link the two by a wireless system.

[0026]

According to the present invention, there is provided a one-can, two-channel bath water heater according to claim 1, which is connected to a bathtub via a circulation circuit having a circulation pump. An exchanger, a hot water supply heat exchanger sharing the heat absorption fins with the bath heat exchanger, a burner for heating the heat exchanger, and a hot water supply heat exchanger provided in a water passage of the hot water supply heat exchanger. A boiling prevention sensor for preventing boiling of hot and cold water in the exchanger, wherein when the boiling prevention sensor detects a certain temperature and uses hot water within a certain time after the detection, the burner The ignition delay means for delaying the ignition of the bath for a predetermined time is provided, so that the burner is immediately ignited by the ignition delay means immediately after the hot water in the water pipe of the heat exchanger for hot water supply by using the bath alone, even if the hot water supply is used. Time difference without Stomach that was to be burned,
Overshoot immediately after the start of hot water supply can be reduced. Further, according to the one-can-two-channel bath water heater according to claim 2, a bath heat exchanger connected to a bathtub through a circulation circuit having a circulation pump, and a heat exchanger for heat absorption with the bath heat exchanger A hot water supply heat exchanger sharing a fin, a burner for heating the heat exchanger, and a hot water supply temperature sensor provided in a water passage of the hot water supply heat exchanger are provided separately. A boiling prevention sensor for preventing boiling of hot and cold water in the heat exchanger, wherein when the boiling prevention sensor detects a certain temperature and uses hot water within a certain time after the detection, Since the ignition delay means for delaying the ignition of the burner for a predetermined time is provided, by using a dual sensor of a boiling prevention sensor and a tapping temperature sensor, in addition to reducing the overshoot, the outlet of the hot water supply heat exchanger is provided. After the temperature is delayed When still high, immediately shifts to feedback control, it is possible to improve the hot water properties. Further, according to the one-can-two-channel bath water heater according to claim 3, a bath heat exchanger connected to the bathtub through a circulation circuit having a circulation pump, and a heat exchanger for the bath and a heat absorber for heat absorption A hot water supply heat exchanger sharing a fin; a burner for heating the heat exchanger; a hot water supply temperature sensor provided in a water passage of the hot water supply heat exchanger; A sensor for preventing boiling of hot water in the hot water supply heat exchanger, wherein the sensor and the sensor are provided separately. Since the ignition delay means for delaying the ignition of the burner for a predetermined time when the hot water supply is used within the time is provided, a triple sensor including a boiling prevention sensor, a hot water temperature sensor, and a heating safety sensor is used. Oh Bar chute, when the hot water supply heat exchanger is abnormally heated with improvement in tapping properties, to shut off the fuel supply to the burner stops combustion itself becomes triple safety, becomes Usage very safe.

[Brief description of the drawings]

FIG. 1 is an overall configuration diagram of a one-can, two-channel bath water heater to which the present invention is applied.

FIG. 2 is a block diagram showing one embodiment of the present invention.

FIG. 3 is a flowchart illustrating an embodiment of the present invention.

[Explanation of symbols]

 REFERENCE SIGNS LIST 1 bath hot water supply device 2 hot water supply heat exchanger 3 gas burner 4 bath heat exchanger 5 fin 6 controller 15 hot water temperature sensor 16 heating safety sensor 18 bathtub 19 circulation circuit 21 circulation pump 29 boiling prevention sensor 30 blower fan 33 ignition delay means

 ──────────────────────────────────────────────────続 き Continued on the front page F term (reference) 3L024 CC06 CC17 CC19 DD04 DD13 DD16 DD22 DD27 EE03 GG03 GG04 GG06 GG12 GG24 GG28 GG50 HH11 HH26 HH60

Claims (3)

[Claims] 1. A bath heat exchanger connected to a bathtub through a circulation circuit having a circulation pump, a hot water supply heat exchanger sharing the bath heat exchanger and a heat absorption fin, and the heat exchanger And a boiling prevention sensor provided in a water passage of the hot water supply heat exchanger for preventing boiling of hot water in the hot water supply heat exchanger, wherein the boiling prevention sensor has a constant temperature. An ignition delay means for delaying the ignition of the burner for a predetermined time when the hot water is used within a certain period of time after the detection, and a one-can-two-channel bath water heater. 2. A bath heat exchanger connected to a bathtub through a circulation circuit having a circulation pump, a hot water supply heat exchanger sharing the bath heat exchanger and a heat absorption fin, and the heat exchanger A hot water heater, and a tap water temperature sensor provided in a water passage of the hot water supply heat exchanger for detecting a hot water temperature, and a boiling prevention sensor for preventing boiling of hot water in the hot water supply heat exchanger. An ignition delay means for delaying ignition of the burner for a predetermined time when the boiling prevention sensor detects a certain temperature and when hot water is used within a certain time after the detection. A one-can, two-channel bath water heater. 3. A bath heat exchanger connected to a bathtub via a circulation circuit having a circulation pump, a hot water supply heat exchanger sharing the bath heat exchanger and a heat absorption fin, and the heat exchanger A hot water heater, a hot water temperature sensor provided in the water passage of the hot water supply heat exchanger for detecting a hot water temperature, a heating safety sensor operating at the time of abnormal heating, and these sensors provided separately from the hot water supply heat exchanger. And a boiling prevention sensor for preventing boiling of hot water in the inside, wherein when the boiling prevention sensor detects a certain temperature and when hot water supply is used within a certain time after the detection, the burner A one-can, two-channel bath water heater comprising an ignition delay means for delaying ignition for a predetermined time.