JP2002349952A - One can two channel water heater - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a single-boiler double water passage hot water feeder for a bath, in which it is possible to prevent hot water of high temperature from being discharged, when a hot water feeding is started, while a required time for additional firing at the time of single follow-up firing operation is being shortened. SOLUTION: When an fellow-up single firing operation is conducted, fed water is fed from both a cold-water feeding pipe 33 and a hot-water feeding pipe 34 into a hot-water feeding pipe 32, and then the fed cold water is made to flow out of a drain pipe 62 branched, midway of the hot water feeding pipe 32.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a bath heat exchanger connected via a reheating water pipe having one end connected to a return pipe from a bathtub and the other end connected to an outgoing pipe to the bathtub, and a water supply pipe connected to one end. The present invention relates to a one-can-two-channel bath water heater in which a hot water supply heat exchanger passing through a hot water supply pipe connected to a hot water supply pipe at the other end is incorporated in a single can body.

[0002]

2. Description of the Related Art In a one-can-two-channel water heater, both a bath heat exchanger and a hot water supply heat exchanger are incorporated in a single can body. At the same time, the hot water pipe is also heated. For this reason, if the additional heating of the bath is performed without additional hot water, the water remaining in the hot water supply pipe will boil. Also, when hot water supply is started during the reheating operation of the bath alone, hot water is first discharged. Therefore, in a conventional one-can-two-channel type bath water heater, when performing additional reheating of the bath, a small amount of combustion is performed so that the water retained in the hot water supply pipe does not boil or reach a certain temperature or higher. Burning the burner continuously by volume or
Or the burner was burning intermittently.

[0003]

In the conventional one-can, two-channel water heater, the water in the hot water supply pipe is prevented from boiling or becoming higher than a certain temperature during the additional operation of the bath. Since the burner is burned with a small amount of combustion or is burned intermittently, there is a problem that it takes a long time to heat up the burner.

[0004] The present invention has been made in view of such problems of the prior art, and high-temperature hot water is discharged at the start of hot water supply while shortening the time required for additional heating in the additional heating alone operation. It is an object of the present invention to provide a one-can-two-channel type bath water heater that can prevent such a situation.

[0005]

The gist of the present invention to achieve the above object lies in the following inventions. [1] A bath heat exchanger passing through a reheating water pipe (22) having one end connected to a return pipe (23) from the bathtub (5) and the other end connected to an outgoing pipe (24) to the bathtub (5). (21) and a hot water supply heat exchanger (31) passing through a hot water supply pipe (32) having one end connected to a water supply pipe (33) and the other end connected to a hot water supply pipe (34).
In a one-can two-channel water heater with a single can body, a bypass pipe (35) connecting the hot water pipe (34) and the water pipe (33), and a hot water pipe (32). A drain pipe (62) branching from the middle, and the drain pipe (62)
Opening / closing means (64, 67) for switching between open and closed states
And control means, wherein the control means (100, 10
1) The water supply flows into the hot water supply pipe (32) from both the water supply pipe (33) and the hot water supply pipe (34) and flows out from the drainage pipe (62) when performing the additional operation of the bath alone. A one-can-two-channel type bath water heater characterized in that the opening / closing means (64, 67) is controlled to set the drain pipe (62) to an open state.

[2] The temperature of water flowing out of the hot water supply pipe (34) to the drain pipe (62) via the hot water supply pipe (32) and the hot water supply pipe from the water supply pipe (33) side. The amount of water supplied from the hot water supply pipe (34) to the hot water supply pipe (32) and the water supply pipe (3) so that the temperature of water flowing out to the drainage pipe (62) via the (32) becomes equal.
The one-can-two-channel bath water heater according to [1], wherein a ratio is set with respect to the amount of water supplied from 3) to the hot water supply pipe (32).

[3] When the reheating operation of the bath alone is performed, the temperature of the water flowing out of the hot water supply pipe (32) to the drain pipe (62) is set to a predetermined boiling prevention limit temperature. [1] or [1] or setting or controlling the amount of water flowing in the hot water supply pipe (32) and the amount of combustion of the burner (13) for heating the bath heat exchanger (21) during the reheating alone operation. The one-can-two-channel bath water heater according to [2].

[4] The hot water supply pipe (32) to the drain pipe (62) in a state where the burner (13) for heating the bath heat exchanger (21) is continuously burned with substantially the maximum input.
The amount of water flowing through the hot water supply pipe (32) during the additional heating operation of the bath is set or controlled so that the temperature of the water flowing out to the boiling prevention limit temperature is set in advance [1]. Or the one-can-two-channel bath water heater according to [2].

[5] First temperature detecting means (48) for detecting the temperature of water flowing out from the hot water supply pipe (32) to the drain pipe (62), and from the forward pipe (24) to the bathtub (5). Second temperature detecting means (55) for detecting the temperature of the discharged water
And the control means (100, 101) is configured to discharge water from the drain pipe (62) to the bathtub (5).
The amount of combustion of the burner (13) for heating 1) is detected by the second temperature detecting means so that the water temperature detected by the first temperature detecting means (48) does not exceed a predetermined boiling prevention limit temperature. [1] characterized in that the water temperature is controlled to be maximum within a range not exceeding a predetermined safe temperature.
Or the one-can-two-channel bath water heater according to [2].

[6] First temperature detecting means (48) for detecting the temperature of water flowing out from the hot water supply pipe (32) to the drain pipe (62), and from the forward pipe (24) to the bathtub (5). Second temperature detecting means (55) for detecting the temperature of the discharged water
And water flow adjusting means for adjusting the amount of water flowing out from the hot water supply pipe (32) to the drain pipe (62), and water from the drain pipe (62) is supplied to the bathtub (5). And the control means (10
0, 101) means that the water temperature detected by the first temperature detecting means (48) does not exceed a predetermined boiling prevention limit temperature and the water temperature detected by the second temperature detecting means exceeds a predetermined safe temperature. The bath heat exchanger (2
The method is characterized in that control is performed such that the amount of combustion of the burner (13) for heating 1) is maximized and the amount of water flowing from the hot water supply pipe (32) to the drain pipe (62) is minimized [1]. Or the one-can-two-channel bath water heater according to [2].

[7] The water from the drain pipe (62) is drained to the bathtub (5), and the control means (100, 101) controls the bathtub (100, 101) during the reheating alone operation of the bath. 5) When the water level in the inside reaches the set water level, the opening / closing means (64, 67) is controlled to set the drain pipe (62) to a closed state. A one-can, two-channel water heater according to any of the above.

[8] Water level detecting means (54) configured to discharge water from the drain pipe (62) to the bathtub (5), and to detect a water level in the bathtub (5); A water amount detecting means (42) for detecting an amount of water flowing through the hot water supply pipe (32); and a water level pouring amount storing means (10) storing in advance a relation between a water level of the bathtub (5) and a pouring amount to the bathtub (5).
4) and the control means (100, 101).
The water level detecting means (5
The water level in the bathtub (5) is detected by 4), and the target pouring amount from the water level to the set water level is obtained based on the storage contents of the water level pouring amount storage means (104), and the reheating alone operation of the bath is performed. When the cumulative amount of water detected by the water amount detecting means (42) reaches the target pouring amount after the start of the operation, the opening / closing means (64, 67) is controlled to close the drain pipe (62). [1]
To [6]. The one-can two-channel water heater according to any one of [1] to [6].

[9] Any of [1] to [8], which has a spray nozzle portion (83) for spraying water flowing out of the drain pipe (62) into a mist in a bathroom. The described one-can, two-channel water heater.

The present invention operates as follows. By setting the drain pipe (62) to the open state when performing the reheating alone operation of the bath, water is supplied to the hot water supply pipe (32) passing through the bath heat exchanger (21) and the water supply pipe (33). ) And the hot water supply pipe (34).
It flows out from a drain pipe (62) that branches off in the middle of 2). As described above, since the water is passed through the hot water supply pipe (32) during the extra heating operation of the bath, the hot water supply pipe (3) can be used even if the burner (13) is burned in a large amount or continuously burned.
Boiling in 2) can be prevented, and the time required for completion of reheating can be reduced.

Further, since the water supplied from both the water supply pipe (33) and the hot water supply pipe (34) to the hot water supply pipe (32) is discharged from the middle of the hot water supply pipe (32), the bath heat exchanger (2).
1) Each part of the hot water pipe (32) passing through (for example,
Even if there is variation in the amount of heat received in the lower water pipe portion and the upper water pipe portion when the hot water supply pipe (32) is divided into the lower part and the upper part and passes through the bath heat exchanger (21) a plurality of times, The temperature of water flowing in from the water supply pipe (33) and flowing out to the drain pipe (62) is substantially equal to the temperature of water flowing in from the hot water supply pipe (34) and flowing out to the drain pipe (62). By setting the ratio between the amount of water supplied from the water supply pipe (33) and the amount of water supplied from the hot water supply pipe (34), the amount of water required to prevent boiling in the hot water supply pipe (32) can be reduced. Can be.

Further, the hot water supply pipe (34) during the reheating alone operation.
, The water temperature distribution in the hot water supply pipe (32) is low at a portion close to the connection point with the hot water supply pipe (34). For this reason, even if hot water supply is started during additional heating alone operation, hot water does not suddenly flow out.

During the reheating operation of the bath alone, the temperature of the water flowing out of the hot water supply pipe (32) to the drain pipe (62) reaches the predetermined boiling prevention limit temperature. In the apparatus for setting or controlling the amount of water flowing in the hot water supply pipe (32) and the amount of combustion of the burner (13) for heating the bath heat exchanger (21) in the hot water supply pipe (32) while preventing boiling, Water flow can be reduced. In particular, when the burner (13) for heating the bath heat exchanger (21) is continuously burned with substantially the maximum input, the temperature of the water flowing out of the hot water supply pipe (32) to the drain pipe (62) is reduced to the boiling prevention limit temperature. In the case of setting or controlling the flow rate in the hot water supply pipe (32) during the reheating alone operation of the bath, the prevention of boiling and the reduction of the flow rate while minimizing the reheating time are minimized. Can be planned.

The amount of water passing may be fixedly set based on the measurement result performed in advance, or the temperature of the water flowing out of the hot water supply pipe (32) to the drain pipe (62) may be adjusted during the reheating alone operation of the bath. May be actually measured, and the flow rate may be dynamically controlled. When the water supply amount is dynamically controlled, the water supply amount can be reduced when the water supply temperature decreases, such as in winter, as compared to when the water supply temperature is high, such as in summer.

[0019] Return water from the drain pipe (62) to the return pipe (23).
In the case where the water is discharged to the bathtub (5) by, for example, merging, the burner (1) that heats the bath heat exchanger (21).
The amount of combustion during the reheating alone operation of 3) was measured using the hot water pipe (3).
As long as the temperature of the water flowing out of 2) to the drain pipe (62) does not exceed the boiling prevention limit temperature and the temperature of the water flowing out of the outgoing pipe (24) to the bathtub (5) does not exceed a predetermined safe temperature. Control to maximize. Thereby, the hot water supply pipe (3
2) It is possible to prevent the boiling inside and secure the reheating operation at a safe temperature. Here, the safe temperature is a temperature in consideration of the heat-resistant temperature of the return pipe (23) and the forward pipe (24) made of resin, in addition to safety for the human body.

The water discharged from the drain pipe (62) is discharged to the bath additional heating channel, the amount of combustion of the burner (13) for heating the bath heat exchanger (21) is adjusted, and the water flow in the hot water supply pipe (32) is adjusted. If the water supply is adjustable, use a hot water supply pipe (3
As long as the temperature of the water flowing out of 2) to the drain pipe (62) does not exceed the boiling prevention limit temperature and the temperature of the water flowing out of the outgoing pipe (24) to the bathtub (5) does not exceed a predetermined safe temperature. The combustion amount of the burner (13) is maximized and the hot water supply pipe (3
Control is performed so that the amount of water flowing out from 2) to the drain pipe (62) is minimized. As a result, the rise in the water level of the bathtub (5) can be reduced while shortening the reheating time.

The water from the drain pipe (62) is supplied to the bathtub (5).
When the water level in the bathtub (5) reaches the set water level during the reheating alone operation of the bath, the drainage pipe (62) is controlled by controlling the opening / closing means (64, 67). Set to closed state. That is, since the boiling of the hot water supply pipe (32) is prevented by passing water until the water level reaches the set water level, the combustion amount of the burner (13) for heating the bath heat exchanger (21) is set to the maximum input or the like. Reheating can be performed at high speed. After reaching the set water level, the drainage pipe (62) is closed to stop the flow of water in the hot water supply pipe (32).
A control system for preventing boiling in the hot water supply pipe (32) operates to reduce the amount of combustion or perform intermittent combustion. Thereby, the time required for reheating is reduced within a range not exceeding the set water level.

More specifically, a water level detecting means (54) for detecting a water level in the bathtub (5), a water amount detecting means (42) for detecting an amount of water flowing through the hot water supply pipe (32), and a bathtub (5) And a water level pouring amount storage means (104) in which a relationship between the water level of the water and the pouring amount into the bathtub (5) is stored in advance. Then, the control means (100, 101) detects the water level in the bathtub (5) by the water level detection means (54) when starting the reheating of the bath, and determines the target pouring amount from the water level to the set water level. It is determined based on the stored contents of the water level pouring amount storage means (104). The drain pipe (62) is set to the open state, and the reheating alone operation is started in a state where water is supplied to the hot water supply pipe (32), and the water flow after the start is detected by the water amount detecting means (42). When the cumulative flow rate reaches the previously calculated target pouring rate, the opening / closing means (64, 67) is controlled to set the drain pipe (62) to the closed state. As a result, the high-speed reheating operation is stopped, and thereafter, a normal reheating operation in which the amount of combustion is suppressed so that boiling does not occur in the hot water supply pipe (32) is performed.

In addition, a spray nozzle (8) for spraying the water flowing out of the drain pipe (62) into a mist in the bathroom.
In the method having the feature 3), the bathroom can be warmed by the reheating operation, which is effective for bathing in winter or the like.

[0024]

DESCRIPTION OF THE PREFERRED EMBODIMENTS An embodiment of the present invention will be described below with reference to the drawings. The one-can-two-channel water heater 10 according to the present invention has a function of supplying hot water to a faucet or pouring water into a bathtub, and a function of reheating water in the bathtub. As shown in FIG. 1, a one-can-two-channel bath water heater 10
Has a combustion chamber 11, and a second burner section 12 composed of eight burners and a first burner section 13 composed of four burners are juxtaposed below the combustion chamber 11. A hot water supply heat exchanger 31 is disposed above both the second burner section 12 and the first burner section 13, and a portion above the first burner section 13 is continuous with the hot water supply heat exchanger 31. The bath heat exchanger 21 is arranged. Bath heat exchanger 21
The hot water supply heat exchanger 31 and the hot water supply heat exchanger 31 are incorporated in a single can body, and are of a so-called one can, two water channel type.

A hot water supply pipe 32 as a heat receiving pipe passes through the hot water supply heat exchanger 31 so as to be folded back plural times. A water supply pipe 33 communicating with a water supply source is connected to one end of the hot water supply pipe 32,
The other end is connected to a hot water supply pipe 34 communicating with a tap for tapping out of hot water. The hot water supply pipe 33 and the hot water supply pipe 34 are
1 and are connected by a bypass pipe 35 so as to bypass them. A bypass servo 41 is provided at a location where the bypass pipe 35 branches off from the water supply pipe 33. The bypass servo 41 variably adjusts a distribution ratio when distributing water supplied from a water supply source to the hot water supply pipe 32 and the bypass pipe 35.

A water flow sensor 42 for detecting the flow rate of water is disposed upstream of the bypass servo 41 in the water supply pipe 33, and a water input thermistor 47 for detecting the temperature of water supply is provided near the water flow sensor 42. Has a water filter 43 attached.

A can body thermistor 44 for detecting the temperature of the heated water is provided in the vicinity of the connection point between the hot water supply pipe 32 and the hot water supply pipe 34, and a hot water outlet is provided downstream of the connection point between the bypass pipe 35 and the hot water supply pipe 34. Hot water supply thermistor 45 for detecting temperature
Are provided respectively. A drain tap 46 is provided further downstream of the hot water supply thermistor 45. A water pipe thermistor 48 is provided at the U-bend portion of the hot water supply pipe 32.

A reheating water pipe 22 as a heat receiving pipe passes through the bath heat exchanger 21 so as to be folded back plural times. A return pipe 23 for returning water in the bathtub 5 to the bath heat exchanger 21 is connected to one end of the hot water supply pipe 32, and the bath heat exchanger 2 is connected to the other end.
1, an outgoing pipe 24 for guiding the heated water to the bathtub 5 is connected.

In the middle of the return pipe 23, a bath water flow switch 51, a bath thermistor 52,
A pump 53 and a water level sensor 54 are arranged. An outgoing bath thermistor 5 for detecting the temperature of water to be sent to the bathtub 5 is provided near the connection point between the reheating water pipe 22 and the outgoing pipe 24.
5 is attached.

The hot water supply thermistor 45 and the water drain plug 46 of the hot water supply pipe 34 and the place near the water level sensor 54 in the return pipe 23
Are connected by a pouring pipe 61. A predetermined location in the middle of the pouring pipe 61 is provided in the middle of the hot water pipe 32 (the U-vent portion of the hot water pipe 32 and the water pipe thermistor 4).
8 is connected. In the middle of the drain pipe 62, a throttle 63 for limiting the flow rate is provided.

A pouring valve 64 is provided in the pouring pipe 61 between the connecting point with the drain pipe 62 and the connecting point with the hot water supply pipe 34. In the pouring pipe 61, between the connecting point with the return pipe 23 and the connecting point with the drain pipe 62, in order from the side close to the return pipe 23, the hot water sensor 65, the check valve 66, the pouring electromagnetic A valve 67 and a vacuum breaker 68 are attached.
Furthermore, a predetermined location between the check valve 66 and the pouring solenoid valve 67 and a predetermined location on the hot water supply pipe 34 side with respect to the hot water supply valve 64 are connected by an overpressure relief pipe 69, and an A pressure relief valve 70 is attached. Further, at a connection point between the pouring pipe 61 and the hot water supply pipe 34, a hot water level servo 49 for limiting the hot water output when the set temperature is high or the like is provided.

The supply and exhaust are forcibly performed by blowing supply air from below the combustion chamber 11 by the combustion fan 14, and the exhaust is discharged from the upper exhaust port of the combustion chamber 11. An ignition plug 15 and a frame rod 16 are arranged near the first burner section 13. The gas supply pipe 81 is provided with an original gas solenoid valve 82 and a gas proportional valve 83 downstream thereof. The gas supply pipe 81 branches downstream of the gas proportional valve 83,
The other is connected to the first burner unit 13 via a second gas solenoid valve 85 and the other to the second burner unit 12. In addition, below the hot water supply heat exchanger 31, the overheat prevention device 17 is provided.
As a thermal fuse.

Control circuit 1 of one-can-two-channel water heater 10
Reference numeral 00 denotes a central processing unit (CPU) 101 that plays a central role in various controls, a ROM (read only memory) 102 that stores programs and various fixed data,
The main components are a RAM (random access memory) 103 for storing data and the like that are temporarily required for executing the program, and a non-volatile RAM 104. Through the circuit 105, in addition to the various electromagnetic valves, thermistors, and sensors shown in FIG.

The function as the control means is performed by the CPU 101 executing a predetermined program. The function as opening / closing means for switching the drain pipe 62 between the open state and the closed state is as follows.
Pouring valve 64 and pouring solenoid valve 67 perform. That is, by closing the pouring valve 64 and opening the pouring solenoid valve 67, the drain pipe 62 is opened, and by closing both the pouring valve 64 and the pouring solenoid valve 67, the drain pipe 62 is closed. Becomes Also,
The first temperature detecting means for detecting the temperature of the water flowing out of the hot water supply pipe 32 to the drain pipe 62 is a water pipe thermistor 48, and the second temperature detecting means for detecting the temperature of the water flowing out of the forward pipe 24 to the bathtub 5.
The temperature detecting means is an outgoing bath thermistor 55.

The water level sensor 54 functions as a water level detecting means, and the water level sensor 42 functions as a water level detecting means.
However, the function as the water level pouring amount storage means is performed by the CPU 101 and the nonvolatile RAM 104. 1 does not provide a function as a water flow rate adjusting means for adjusting the water flow rate in the hot water supply pipe 32 at the time of the additional heating operation of the bath, and the water flow rate is fixed. .

Next, the operation will be described. First, the high-speed mode in the reheating alone operation of the bath in which only reheating is performed without tapping the hot water will be described. When the reheating alone operation is performed in the high-speed mode, the CPU 101 as the control unit sets the bypass servo 41 to a predetermined intermediate opening degree and sets a part of the supply water to be distributed to the bypass pipe 35. Pouring valve 64
Is closed and the pouring solenoid valve 67 is opened to set the drain pipe 62 to the open state. As a result, water is fed from both the water supply pipe 33 and the hot water supply pipe 34 to the hot water supply pipe 32, and the supplied water flows out of the drainage pipe 62, which branches off in the middle of the hot water supply pipe 32, to the pouring pipe 61 and returns to the return pipe 23. The water flows into the bathtub 5 through the like.

At this time, the CPU 101 determines that the water temperature detected by the water pipe thermistor 48 as the first temperature detecting means does not exceed a predetermined boiling prevention limit temperature (here, 90 ° C.) and that the second temperature detecting means The first burner unit 1 is controlled so that the amount of combustion is maximized in a range where the water temperature detected by the outgoing bath thermistor 55 does not exceed a predetermined safe temperature.
The combustion amount of No. 3 is controlled. In this way, reheating is performed while passing water through the hot water supply pipe 32, and the amount of combustion at that time is controlled to be maximum under the above conditions, so that reheating can be performed in a short time.

Further, since water is also supplied from the side of the hot water supply pipe 34 to the hot water supply pipe 32, the water temperature distribution in the hot water supply pipe 32 is low at a portion close to a connection point with the hot water supply pipe 34. Therefore, even if hot water supply is started during the additional heating alone operation, hot water is prevented from being suddenly discharged. In consideration of this, the boiling prevention limit temperature may be set several degrees higher than 90 ° C., so that additional cooking can be performed in a shorter time in this case. Since the amount of combustion is controlled so that the detected temperature of the water pipe thermistor 48 does not exceed the boiling prevention limit temperature and the detected temperature of the outgoing bath thermistor 55 does not exceed the safe temperature, the reheating operation is performed. As the temperature of the bath water rises as it progresses, the amount of combustion will naturally decrease.

The flow rate of the water supplied to the hot water supply pipe 32 is
3 limits the value to a preset value. For example,
When the temperature of the bath water at the start of reheating is 25 ° C. when the incoming water temperature is 15 ° C., the temperature detected by the water pipe thermistor 48 while the first burner section 13 is continuously burned with the maximum input is the boiling prevention limit temperature. Set so that the water flow is minimized within the range not exceeding. As described above, when continuous combustion is performed with the maximum input, the water flow rate is set as small as possible within a range not exceeding the boiling prevention limit temperature.
Even if the water flowing out of 2 is discharged to the bathtub 5,
The rise of the water level can be kept small.

When the drainage from the drainage pipe 62 is not discharged to the bath 5, the first burner unit must be in a range where the water temperature detected by the water pipe thermistor 48 as the first temperature detection means does not exceed the boiling prevention limit temperature. The combustion amount of the first burner unit 13 may be controlled so that the combustion amount of the first burner 13 is maximized.

The opening degree of the bypass servo 41, that is, the ratio of the amount of water supplied from the hot water supply pipe 34 to the hot water supply pipe 32 and the amount of water supplied from the water supply pipe 33 to the hot water supply pipe 32 is determined by the hot water supply pipe from the hot water supply pipe 34 side. The temperature of the water flowing out to the drain pipe 62 via the water supply pipe 32 is set to be equal to the temperature of the water flowing out of the water supply pipe 33 to the drain pipe 62 via the hot water supply pipe 32.

Normally, the hot water supply pipes receive different amounts of heat in each part of the hot water supply heat exchanger. For example, in the one shown in FIG. 2A, the hot water supply pipe 32a at the lower stage of the heat exchanger is arranged on the side near the burner.
0 ° C exhaust gas enters. On the other hand, the exhaust gas reaching the hot water supply pipe 32b arranged at the upper stage of the heat exchanger is discharged to the lower hot water supply pipe 3b.
After being absorbed by 2a or the like, the temperature has dropped to about 200 ° C.

Accordingly, the lower hot water supply pipe 32a receives a large amount of heat (for example, 60 to 70%), and the upper hot water pipe 32b receives a small amount of heat (for example, 40 to 30%).
Therefore, a location where the drainage pipe 62 branches from the hot water supply pipe 32 is provided in a U-vent portion or the like where the hot water supply pipe 32 transitions from the lower stage to the upper stage, and the lower hot water supply tube 32a in the reheating alone operation of the bath. Water quantity and hot water supply pipe 3 on upper side
There is a difference in the flow rate of 2b. That is, the ratio of the flow rates is set such that the temperature of the water flowing out of the lower hot water supply pipe 32a to the drain pipe 62 is substantially equal to the temperature of the water flowing out of the upper hot water supply pipe 32b to the drain pipe 62. . For example, a lower hot water supply pipe 32a and an upper hot water supply pipe 32b
Is set to 7: 3.

As described above, the water is fed into the hot water supply pipe 32 from both sides of the water supply pipe 33 and the hot water supply pipe 34 and discharged from the middle of the hot water supply pipe 32, so that the water supply amount from the water supply pipe 33 side and the hot water supply pipe 34 side By properly setting the ratio of the amount of water supplied from, the amount of water flow can be minimized. In the case shown in FIG. 2A, the reheating water pipe 22 is disposed so as to be in contact with the upper side of the hot water supply pipe 32 of each stage. As shown in FIGS. 2 (a) to 2 (c) and the like, there are various types of water pipe routing in the heat exchanger. Therefore, the ratio of the flow rate (opening degree of the bypass servo 41) corresponding to each type is different. ) Can be set.

If there is no problem that the bathtub water level at the end of the reheating is higher than the set water level, the reheating alone operation is executed in the above-described high-speed mode over the entire period. On the other hand, when control is performed so as not to exceed the set water level, the reheating operation is performed in the above-described high-speed mode from the start of reheating to the set water level, and thereafter, the water supply through the hot water supply pipe 32 is stopped. Perform the reheating operation in the mode. In the normal mode, the combustion amount of the burner is suppressed to a small value or intermittent combustion is performed so that boiling does not occur in the hot water supply pipe 32. In the present embodiment, the amount of combustion is controlled such that the water temperature detected by the water pipe thermistor 48 does not exceed the boiling prevention limit temperature and the temperature detected by the outgoing bath thermistor 55 does not exceed the safe temperature. Switching can be performed simply by closing the drain pipe 62.

When the reheating is performed so as not to exceed the set water level, the relationship between the bathtub water level and the amount of hot water is measured in advance and stored in the nonvolatile RAM 104. That is, when pouring water into the bathtub 5 for the first time after installing the appliance, the water level sensor 5
Then, the relationship between the water level detected and the pouring amount is measured, and the measurement result is stored in the nonvolatile RAM 104. The pouring amount is measured based on the output of the water amount sensor 42.

FIG. 3 shows the flow of the reheating operation when reheating is performed so as not to exceed the set water level. When the reheating switch is turned on, first, the current bathtub water level is measured by the water level sensor 54 (step S301).
Next, the target water level set in the bath remote controller is checked (step S302), and the remaining pouring amount from the difference between the target water level and the current water level to the target water level is determined by the non-volatile R
It is determined based on the measurement result stored in the AM 104 (step S303). Thereafter, the reheating operation is performed in the high-speed mode until the accumulated water flow amount measured by the water amount sensor 42 becomes the remaining pouring amount (step S304; N) (step S305). Step S304; Y), the mode is switched to the normal mode, and the reheating operation is performed until the bathtub water reaches the set temperature (steps S306 and S307).

Next, a case will be described in which the hot water flowing out of the drain pipe 62 is sprayed into the bathroom as a mist. FIG.
The configuration of a one-can-two-channel type bath water heater 10b that is sprayed into a bathroom is shown. The same portions as those in FIG. 1 are denoted by the same reference numerals, and description thereof will be omitted. In FIG. 4, the drainage pipe 62 is not connected to the pouring pipe 61, and a spray nozzle portion 93 is attached to the tip thereof. This spray nozzle section 93
Is installed at a predetermined location in the bathroom. A mist water flow switch 91 is arranged at a predetermined position in the middle of the drain pipe 62 and downstream of the throttle 63, and further downstream of the valve 9
2 is attached. In addition, the pouring valve 64 shown in FIG. 1 is not attached to the one-can two-channel water heater 10b in FIG.

When the bath additional heating alone operation is performed in the high-speed mode, the water amount sensor 42 is set to the intermediate opening degree, the spray nozzle unit 93 is opened, and the drain pipe 62 is set to the open state. Thereby, the water supply is sprayed into the bathroom from the spray nozzle 93 through the hot water supply pipe 32 and the drainage pipe 62.

As described above, by spraying into the bathroom in the form of a mist, it is possible to prevent the bathtub water level from rising when reheating in the high-speed mode, and to warm the bathroom during the reheating operation. It is effective for bathing in winter.

In the embodiment described above, the amount of water flowing into the hot water supply pipe 32 when the bath additional heating alone operation is performed in the high-speed mode is fixedly set. The water flow rate may be adjusted. In such a case, the temperature of the water flowing from the hot water supply pipe 32 to the drain pipe 62 does not exceed the boiling prevention limit temperature, and
Control may be performed so that the amount of combustion in the first burner unit 13 is maximized and the amount of water flowing through the hot water supply pipe 32 is minimized within a range where the temperature of the water flowing out to the predetermined safety temperature is not exceeded. If the flow rate is actively adjusted in this way, the flow rate can always be minimized even when the water supply temperature fluctuates, such as in summer and winter.

In addition, in the embodiment, in order to prevent the water level from exceeding the set water level, reheating is performed in the high-speed mode until the set water level is reached, and thereafter the mode is switched to the normal mode. It is also possible to adopt a configuration in which the hot water is additionally fired in the high-speed mode, and the hot water flowing out of the drain pipe 62 is sprayed into the bathroom in a mist state.

Further, in the embodiment, an example of one-can-two-water-type hot water supply and reheating is shown. However, the present invention is not limited to this, and a circuit such as floor heating may be used as the circulation path side. Therefore, the present invention is also effective for a single-can multi-channel water heater in which each flow path of hot water supply, reheating and heating is heated by a heat exchanger incorporated in a common can body. The fuel supplied to the burner may be oil or the like in addition to gas.
In the case of petroleum or the like, a burnerless type such as a gun type burner may be used.

[0054]

According to the one-can-two-channel type bath water heater of the present invention, the water flows through the hot water supply pipe during the reheating alone operation, so that the burner burn amount can be increased or continuous combustion can be performed. In addition, boiling in the hot water supply pipe is prevented, and the time required for completion of reheating can be reduced. In addition, since the water is sent from both the water supply pipe and the hot water supply pipe to the hot water supply pipe and the water supply is discharged from the middle of the hot water supply pipe, the amount of heat received at each point of the hot water supply pipe passing through the bath heat exchanger varies. Even if there is, the temperature of water flowing in from the water supply pipe and flowing out of the drain pipe and the temperature of water flowing in from the hot water pipe and flowing out of the drain pipe are almost equal to each other. By setting the ratio to the amount of water input from the hot water supply pipe side, it is possible to reduce the water flow required to prevent boiling in the hot water supply pipe.

Further, since the water is also supplied from the side of the hot water supply pipe to the hot water supply pipe during the additional heating alone operation, the water temperature distribution in the hot water supply pipe is low at a portion close to the connection point with the hot water supply pipe. Therefore, even if hot water supply is started during the additional heating alone operation, hot water is prevented from being suddenly discharged.

When the bath is operated alone, the temperature of the water flowing out of the hot water supply pipe to the drainage pipe reaches a predetermined boiling prevention limit temperature so that the water flowing through the hot water supply pipe during the single heating operation of the bath is not required. By setting or controlling the amount of water and the amount of combustion of the burner that heats the bath heat exchanger, the amount of water passing through the hot water supply pipe can be reduced while preventing boiling.
In particular, when the burner that heats the bath heat exchanger is continuously burned at approximately the maximum input, and the temperature of the water flowing from the hot water supply pipe to the drain pipe is set to the boiling prevention limit temperature during the reheating alone operation of the bath. By setting or controlling the flow rate in the hot water supply pipe, it is possible to prevent boiling and reduce the flow rate while minimizing the time required for reheating.

By dynamically adjusting the flow rate of water in the hot water supply pipe during the reheating operation of the bath alone, the flow rate can be minimized even when the water supply temperature fluctuates in summer and winter. .

The water discharged from the drainpipe is discharged to the bathtub, and the burner for heating the bath heat exchanger during the reheating alone operation is determined by the temperature at which the temperature of the water flowing from the hot water supply pipe to the drainpipe is reduced to the boiling prevention limit. If the temperature is controlled so that the temperature of the water flowing out of the outgoing pipe to the bathtub does not exceed the predetermined safe temperature, it is necessary to prevent boiling in the hot water supply pipe and add the safe temperature. The firing operation is ensured.

The water discharged from the drain pipe is discharged to the bathtub, and the combustion amount of the burner for heating the bath heat exchanger and the flow rate of the hot water pipe can be adjusted. As long as the temperature of the flowing water does not exceed the boiling prevention limit temperature and the temperature of the water flowing out of the outgoing pipe to the bathtub does not exceed a predetermined safe temperature, the burner burns up to a maximum and flows out from the hot water supply pipe to the drain pipe. By controlling the amount of water to be minimized, it is possible to reduce the rise in the bathtub water level while shortening the reheating time.

In addition, the water from the drain pipe is configured to be discharged to the bathtub, and the reheating of the bath in the high-speed mode is performed only until the water level in the bathtub reaches the set water level during the reheating alone operation of the bath. The required time for reheating can be reduced within a range not exceeding the set water level.

In addition, in the case of a device having a spray nozzle for spraying the water flowing out of the drain pipe into a mist, the bathroom can be heated by a reheating operation.
It is effective for bathing in winter.

[Brief description of the drawings]

FIG. 1 is an explanatory diagram showing a one-can, two-channel water heater according to an embodiment of the present invention.

FIG. 2 is a cross-sectional view showing one-can-two-channel heat exchangers.

FIG. 3 is a flow chart showing an operation when the reheating alone operation is performed so that the one-can-two-channel type bath water heater according to one embodiment of the present invention does not exceed a set water level.

FIG. 4 is an explanatory view showing a one-can, two-channel type bath water heater according to one embodiment of the present invention, which sprays waste water into a bathroom in a mist state.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 5 ... Bathtub 10 ... One-can two-channel type bath water heater 11 ... Combustion chamber 12 ... 2nd burner part 13 ... 1st burner part 14 ... Combustion fan 15 ... Spark plug 16 ... Frame rod 17 ... Overheat prevention device 21 ... Bath heat Exchanger 22 ... additional water pipe 23 ... return pipe 24 ... outgoing pipe 31 ... hot water supply heat exchanger 32 ... hot water supply pipe 33 ... water supply pipe 34 ... hot water supply pipe 35 ... bypass pipe 41 ... bypass servo 42 ... water quantity sensor 43 ... water filter 44 ... can body thermistor 45 ... hot water supply thermistor 46 ... water drainage plug 47 ... water input thermistor 48 ... water pipe thermistor 49 ... hot water volume servo 51 ... bath water flow switch 52 ... bath thermistor 53 ... pump 54 ... water level sensor 55 ... outgoing bath thermistor 61 ... pouring water Pipe 62 ... Drain pipe 63 ... Throttle 64 ... Pouring valve 65 ... Hot water sensor 66 ... Check valve 67 ... Pouring solenoid valve 68 ... Vacuum valve Car 69 ... Overpressure relief pipe 70 ... Overpressure relief valve 81 ... Gas supply pipe 82 ... Original gas solenoid valve 83 ... Gas proportional valve 84 ... First gas solenoid valve 85 ... Second gas solenoid valve 91 ... Mist water flow switch 92 ... Valve 93 ... Spray nozzle unit 100 ... Control circuit 101 ... CPU 102 ... ROM 103 ... RAM 104 ... Non-volatile RAM 105 ... I / O interface circuit

 ──────────────────────────────────────────────────続 き Continued on the front page F term (reference) 3L024 CC19 DD04 DD14 DD17 DD19 DD22 DD27 DD37 GG03 GG04 GG05 GG06 GG07 GG12 GG22 GG23 GG24 HH12 HH22 HH26 3L070 AA00 BB03 DD00 DE09 DG02 DG06

Claims (9)

[Claims] 1. A bath heat exchanger passing through a reheating water pipe having one end connected to a return pipe from a bathtub and the other end connected to a forward pipe to a bathtub, a water supply pipe connected to one end, and a hot water supply pipe connected to the other end. And a hot water supply heat exchanger passing through the connected hot water supply pipe in a single can two-channel water heater. A bypass pipe connecting the hot water supply pipe and the water supply pipe, and a hot water supply pipe A drain pipe that branches off from the middle, an opening / closing unit that switches the drain pipe between an open state and a closed state, and a control unit.When the control unit performs the reheating alone operation of the bath, the water supply is Controlling the opening / closing means to open the drain pipe so as to flow into the hot water pipe from both the water supply pipe and the hot water pipe and flow out of the drain pipe; Bath water heater. 2. The temperature of water flowing out of the hot water supply pipe through the hot water supply pipe to the drainage pipe and the temperature of water flowing out of the water supply pipe through the hot water supply pipe to the drainage pipe. The ratio between the amount of water supplied from the hot water supply pipe to the hot water supply pipe and the amount of water supplied from the water supply pipe to the hot water supply pipe is set so that the water supply pipes are equal to each other. Can two channel water heater. 3. The reheating alone operation of the bath so that the temperature of the water flowing out of the hot water supply pipe to the drainage pipe reaches a predetermined boiling prevention limit temperature. The one-can-two-channel bath water heater according to claim 1 or 2, wherein the amount of water flowing in the hot water supply pipe and the amount of combustion of a burner for heating the bath heat exchanger are set or controlled. 4. The temperature of water flowing from said hot water supply pipe to said drain pipe under a condition in which a burner for heating said bath heat exchanger is continuously burned at substantially maximum input so as to reach a predetermined boiling prevention limit temperature. The one-can-two-channel bath water heater according to claim 1 or 2, wherein the amount of water passing through the hot water supply pipe during the additional operation of the bath alone is set or controlled. 5. A first temperature detecting means for detecting a temperature of water flowing from the hot water supply pipe to the drain pipe, and a second temperature detecting means for detecting a temperature of water flowing from the forward pipe to the bathtub. And a controller configured to discharge water from the drain pipe to the bathtub, wherein the control unit detects a combustion amount of a burner that heats the bath heat exchanger by the first temperature detection unit. Water temperature does not exceed a predetermined boiling prevention limit temperature and
The one-tank two-channel water heater according to claim 1 or 2, wherein the water temperature detected by the temperature detecting means is controlled so as to be maximum within a range not exceeding a predetermined safe temperature. 6. A first temperature detecting means for detecting a temperature of water flowing from the hot water supply pipe to the drain pipe, a second temperature detecting means for detecting a temperature of water flowing from the forward pipe to the bathtub, The water supply pipe further includes a water flow rate adjusting unit that adjusts an amount of water flowing out of the hot water pipe to the drain pipe, and the water from the drain pipe is discharged to the bathtub. The bath heat exchanger is heated so that the water temperature detected by the first temperature detecting means does not exceed a predetermined boiling prevention limit temperature and the water temperature detected by the second temperature detecting means does not exceed a predetermined safe temperature. The one-tank two-channel bath water heater according to claim 1 or 2, wherein control is performed such that the amount of combustion of the burner is maximized and the amount of water flowing from the hot water supply pipe to the drain pipe is minimized. . 7. The water supply device according to claim 1, wherein the water is discharged from the drain pipe to the bathtub, and the control means opens and closes when the water level in the bathtub reaches a set water level during the reheating alone operation of the bath. The one-tank two-channel water heater according to any one of claims 1 to 6, wherein the drain pipe is set to a closed state by controlling means. 8. A water level detecting means configured to discharge water from the drain pipe to the bathtub, a water level detecting means for detecting a water level in the bathtub, a water amount detecting means for detecting a water amount flowing through the hot water supply pipe, A water level pouring amount storing means for preliminarily storing a relationship between a water level of the bathtub and a pouring amount to the bathtub, wherein the control means controls the water level in the bathtub by the water level detecting means when starting reheating of the bath; And the target pouring amount from the water level to the set water level is determined based on the storage content of the water level pouring amount storage means, and is detected by the water amount detecting means after initiating the independent heating operation of the bath. The one-can-two-drain type according to any one of claims 1 to 6, wherein when the total amount of water reaches the target pouring amount, the opening / closing means is controlled to set the drain pipe to a closed state. Bath water heater. 9. A one-can, two-channel bath water supply according to any one of claims 1 to 8, further comprising a spray nozzle for spraying water flowing out of the drain pipe into a mist. vessel.