JP3713938B2 - Control method for reheating bath water heater - Google Patents

Description

[0001]
BACKGROUND OF THE INVENTION
The present invention relates to a reheating operation control method for a bath water heater. That is, the present invention relates to a reheating operation control method in a one-can / two-channel bath water heater in which a bath-side heat exchanger and a hot-water supply-side heat exchanger are placed in the same can and heated by a combustion apparatus such as an oil burner.
[0002]
[Prior art]
Place the bath-side heat exchanger and hot-water supply side heat exchanger in the same can and heat them with a combustion device such as an oil burner. Also, between the bath circulator and the inlet side of the bath-side heat exchanger The return pipe is piped, the outgoing pipe line is connected between the circulation fitting of the bathtub and the outlet side of the heat exchanger, and the outgoing bypass pipe is connected to the bath-side bypass pipe branched from the return pipe via a three-way valve. There is a bath water heater with 1 can and 2 waterways.
[0003]
In such a bath water heater, the bath side heat exchanger and the hot water side heat exchanger are housed in the same can, and the temperature of the can rises while the hot water is being used. Since it is absorbed by the side heat exchanger and used for hot water supply, there is little effect on the bath side heat exchanger. However, when the use of hot water is finished, hot water has accumulated in the hot water heat exchanger due to post-boiling, and the heat in the hot water side heat exchanger increases the temperature in the bath side heat exchanger. As a result, a hot water pool is formed in the bath-side heat exchanger.
[0004]
Since it is dangerous if the hot water puddle moves in the forward pipe and is discharged from the circulating metal fittings of the bathtub by the reheating operation, conventionally, the air is blown for several minutes immediately after the hot water supply (post-purge). The hot water supply side heat exchanger and bath side heat exchanger were cooled.
[0005]
[Problems to be solved by the invention]
However, in such a method, if a reheating operation is performed on the bath side before the temperature of the hot water supply side heat exchanger or the bath side heat exchanger is lowered by the post-purge, it accumulates in the bath side heat exchanger. The hot water pool which is still hot is further heated, and moves to the forward pipe and is discharged from the circulation fitting into the bathtub, which may give the bather an uncomfortable feeling and a feeling of heat.
[0006]
The present invention has been made in view of the drawbacks of the conventional example described above, and the object of the present invention is to discharge hot hot water from the circulating metal fittings even when the reheating operation is performed immediately after using the hot water supply on the bath side. This is to prevent the bather from feeling uncomfortable.
[0009]
DISCLOSURE OF THE INVENTION
The method for controlling the additional cooking operation of the bath hot water supply apparatus according to claim 1, wherein the hot water supply side heat exchanger and the bath side heat exchanger are placed in the same can and heated by the combustion apparatus, A circulation circuit for reheating is formed between the side heat exchanger, a bypass path is provided in the circulation circuit so as to bypass the bath side heat exchanger, and means for opening and closing the bypass path is provided. If the temperature of the hot water supply side heat exchanger or bath side heat exchanger is higher than a certain temperature, the bypass path is opened by the bypass path opening and closing means, and the circulation circuit is not burned without burning the combustion apparatus. When the temperature of the hot water supply side heat exchanger or the bath side heat exchanger falls below a certain temperature, the bypass path is closed by the bypass path opening and closing means, and the combustion device is burned and circulated. It is characterized by circulating the tub water to the bath heat exchanger circuit.
[0010]
In the reheating operation control method according to claim 1, when the temperature of the hot water supply side heat exchanger or the bath side heat exchanger is increased due to post-boiling, the bath side heat exchanger is not burned without burning the combustion device. The hot water in the bathtub is circulated, and the low-temperature hot water that has passed through the bypass path is mixed with the hot water that flows out from the bath-side heat exchanger by opening the bypass path, and is discharged from the circulation fittings. The temperature of the hot water pool stored in the interior can be lowered by mixing with the hot water. Therefore, it is possible to further improve the safety during the chasing operation.
[0011]
DETAILED DESCRIPTION OF THE INVENTION
(First embodiment)
FIG. 1 is a diagram showing a configuration of a bath water heater 1 according to an embodiment of the present invention. A hot water supply side heat exchanger 3 and a bath side heat exchanger 4 are disposed in the can body 2, and an oil burner 6 and a blower fan 7 are provided below the heat exchangers 3 and 4. A heat exhaust port 5 is opened on the upper surface of the.
[0012]
In the oil burner 6, when the electromagnetic valve 9 provided in the oil supply path 8 is opened and the electromagnetic pump 10 is operated, oil (petroleum) circulates in the oil supply path 8 and is discharged from the nozzle 11 in a mist form. The mist-like oil discharged from the nozzle 11 is mixed with air and burned. The oil burner 6 has an ignition device 12 for igniting oil discharged from the nozzle 11 and a combustion detection sensor (frame rod) 13 for monitoring combustion. The blower fan 7 forcibly supplies air to the oil burner 6 and is controlled so as to burn oil at an optimum air-fuel ratio.
[0013]
A hot water supply passage 14 and a hot water supply passage 15 are connected to the hot water supply side heat exchanger 3 to constitute a hot water supply water heater. Water (city water) introduced from the water supply path 14 through the filter 17 is heated while passing through the hot water supply side heat exchanger 3 during combustion of the oil burner 6, and sent out from the hot water supply side heat exchanger 3 to the hot water supply path 15. It is. The hot water supply side bypass passage 16 connects between the water supply passage 14 and the hot water supply passage 15 so as to bypass the hot water supply side heat exchanger 3, and the hot water heated by the hot water supply side heat exchanger 3 and the hot water supply side bypass passage are connected. The water flowing through 16 is mixed and supplied to the hot water / mixing channel 25. The flow rate of water flowing through the hot water supply side bypass passage 16 and the flow rate of hot water discharged from the hot water mixing passage 25 are controlled by a water proportional valve 19 and a water amount servo valve 20, respectively.
[0014]
Outputs (measurement signals) of the water amount sensor 18, the incoming water temperature sensor 21, the can body hot water temperature sensor 22, and the mixing temperature sensor 23 are input to a controller (not shown), and the controller supplies the hot water supply path 15 from the hot water supply side heat exchanger 3. The heating power of the oil burner 6 and the water proportional valve 19 are controlled so that the temperature of the hot water discharged from the can body and the temperature of the hot water mixed into the hot water mixing passage 25 are equal to the set value. The hot water adjusted to the set temperature is discharged from the hot water tap 24 through the hot water / mixing passage 25. In addition, a heat exchanger temperature sensor 46 is attached to the hot water supply side heat exchanger 3, and detects the temperature of the hot water supply side heat exchanger 3 or its remaining water.
[0015]
The bath-side heat exchanger 4 constitutes a part of the bath apparatus. That is, the bath apparatus was connected to the bath-side heat exchanger 4 heated by the oil burner 6, the bath-side water intake pipe 33 connected to the inlet side of the bath-side heat exchanger 4, and the circulation fitting 48 of the bathtub 47. A return pipe consisting of a return pipe 32, a forward side pipe consisting of a bath side hot water pipe 34 connected to the outlet side of the bath side heat exchanger 4 and a forward pipe 35 connected to a circulation fitting 48 of the bathtub 47, and a bath The bath side branches off from the connection point of the side inlet pipe 33 and the return pipe 32 via the three-way valve 42 and bypasses the bath side heat exchanger 4 and joins the connection point of the bath side hot water discharge pipe 34 and the forward pipe 35. A bypass passage 36, a bath-side heat exchanger 4 and a bath-side bypass passage 36 are further bypassed to communicate with the return pipe 32 and the forward pipe 35, and a bubble generation bypass path 37 having a two-way valve 44 is provided. . Here, the bath-side bypass passage 36 is mainly used for circulation determination and hot water dropping, and the bubble generation bypass passage 37 is mainly used for bubble bath operation.
[0016]
The return pipe 32 is provided with a water level sensor 38, a circulation pump 39, a bath-side water flow switch 40, and a hot water temperature sensor 41 such as a thermistor. An air pipe 45 is connected to the circulation fitting 48 of the bathtub 47, and the air pipe 45 communicates with the forward pipe 35.
[0017]
The return pipe 32, the bath-side water inlet pipe 33, the bath-side heat exchanger 4, the bath-side hot water outlet pipe 34, and the forward pipe 35 constitute a reheating circuit, and the branch pipe 26 branched from the hot-water mixing path 25 is , A vacuum breaker 27, a dropping water electromagnetic valve 28, a water amount sensor 29, a check valve 30 and a connecting pipe 31 are connected to the forward pipe 35 of the reheating circuit.
[0018]
The structure of the three-way valve 42 is shown in the cross-sectional views of FIGS. The three-way valve 42 has a cylindrical valve body 51 rotatably accommodated in a casing 49 that communicates with the return pipe 32, the bath-side bypass 36, and the bath-side water intake pipe 33. A water passage 52 bent in a substantially L shape is opened from the side to the side. The water passage 52 opened on the lower surface of the valve main body 51 is always in communication with the return pipe 32, and the water passage 52 opened on the side surface of the valve main body 51 is connected to the bath-side water intake pipe 33 side as the valve main body 51 rotates. (Hereinafter referred to as a can body side) and a bath side bypass path 36 side (hereinafter referred to as a bypass side).
[0019]
The valve body 51 is attached to a rotating shaft 50 of a stepping motor (pulse step motor) 43, and the rotation angle is controlled by designating the number of steps of the stepping motor 43. For example, the valve body 51 is within a range of 0 ° to 315 °. It can be rotated at any angle. Therefore, it can be used not only in the fully opened state on the can body side and in the fully opened state on the bypass side, but also in any half-open state.
[0020]
(Operation during reheating operation)
Next, the operation at the time of reheating operation of the bath water heater 1 will be described with reference to the flowchart of FIG. When a reheating switch provided in a remote controller (not shown) in the bathroom is turned on (S1), the inside of the can 2 is in a normal state in which the temperature is sufficiently lowered by the post purge (that is, hot water supply) If the time has passed immediately after that and the detection temperature Th of the heat exchanger temperature sensor 46 is equal to or lower than the predetermined temperature Ts), the three-way valve 42 is set to a normal opening (half-open state or full-open state) on the can body side, The two-way valve 44 of the bubble generation bypass passage 37 is fully closed (S6), the circulation pump is operated (S7), and the oil burner 6 is combusted (S8). As shown in FIG. The hot water in the bathtub 47 is circulated and heated, and the reheating operation is performed until the reheating switch is turned off (S9).
[0021]
On the other hand, when the hot water heater temperature Th detected by the heat exchanger temperature sensor 46 immediately after the hot water supply is higher than the predetermined temperature Ts (S2), when the reheating switch is turned on (S1), the three-way valve 42 is On the can body side, the opening is slightly reduced from the normal opening, and the two-way valve 44 of the bubble generation bypass passage 37 is slightly opened (S3). Next, the circulation pump is operated (S4), and the hot water in the bathtub 47 is circulated through the bath-side heat exchanger 4 without burning the oil burner 6. Therefore, as shown in FIG. 5, the hot water circulated without being heated in the bath-side heat exchanger 4 and the low-temperature hot water that has passed through the bubble generating bypass passage 37 are mixed and discharged from the circulation fitting 48. . Therefore, even if there is a hot water puddle in the bath-side heat exchanger 4, this hot puddle circulates in the reheating circuit without being further heated and is mixed with the low-temperature hot water that has passed through the bubble generation bypass passage 37. Since it is discharged from the circulating metal fitting 48, there is no fear of giving the bather an uncomfortable feeling or a feeling of heat.
[0022]
In this way, when the detected temperature Th of the heat exchanger temperature sensor 46 of the hot water supply side heat exchanger 3 falls below the constant temperature Ts while hot water is circulated in the bath side heat exchanger 4 without burning the oil burner 6, The three-way valve 42 is set to a normal opening on the can body side, the two-way valve 44 of the bubble generating bypass passage 37 is fully closed (S6), the circulation pump is operated (S7) and the oil burner 6 is combusted ( S8), as shown in FIG. 4, the hot water in the bathtub 47 is circulated through the heat exchanger to scoop up. Thereafter, when the reheating switch is turned off (S5, S9), the renewal operation is stopped.
[0023]
(Bubble operation)
Next, the bubble operation in the bath water heater 1 will be described. At the time of bubble operation, as shown in FIG. 6, the three-way valve 42 is fully opened on the bypass side, the two-way valve 44 of the bubble generation bypass passage 37 is also fully opened, the dropping water electromagnetic valve 28 is fully closed, and the circulation pump The operation of 39 is started. When the circulation pump 39 is operated, the hot water in the bathtub 47 sucked from the return pipe 32 enters the forward pipe 35 through the bath side bypass path 36 and the bubble generating bypass path 37, and the air introduced from the air pipe 45. And is ejected from the circulation fitting 48 as a water flow containing bubbles. In this case, since hot water flows through the bath-side bypass passage 36 and the bubble generation bypass passage 37, the flow rate can be increased, and a strong water flow containing bubbles can be ejected from the circulation fitting 48.
[0024]
The reason why the three-way valve 42 is switched to the bypass side instead of the can body side during the bubble operation is that when the three-way valve 42 is opened on the can body side and the bubble operation is performed, when the oil burner 6 burns by the hot water supply operation, This is because the ink is unexpectedly discharged from 48. However, if the heat retention switch of the bath water heater 1 is turned on, the reheating operation is automatically performed each time the heat retention timer counts up for a certain time. When the reheating operation in the heat retaining mode is started during the bubble operation, the three-way valve 42 is switched from the bypass side to the can body side, as shown in FIG. After the closed state has elapsed, the momentum of the water flow discharged from the circulation fitting during the bubble operation decreases. In the case of permitting the chasing operation at the same time, it is necessary to turn on the circulation switch to prevent idling, and for this purpose, the opening degree of the two-way valve 44 needs to be reduced to a very small degree. The momentum of the water flow discharged from the metal fitting 48 is weakened. Furthermore, when it is not predicted, hot water is discharged from the circulating metal fitting 48, which may give the bather an uncomfortable feeling and a feeling of heat.
[0025]
Therefore, in this hot water supply apparatus 1, when a call for periodic reheating operation in the heat retention mode occurs during the bubble operation, the call is not accepted, and reheating in the heat retention mode is performed during the bubble operation. I try not to.
[0026]
However, when the bather turns on the chasing switch of the bathroom remote controller and starts chasing operation, the bubble operation and chasing operation are performed simultaneously. In this case, it is because it is based on the will of the bather, and it is considered that there is no problem.
[0027]
In addition, when the reheating operation is performed in the heat retaining mode first and the bubble operation switch is turned on, the reheating operation and the bubble operation are performed simultaneously. In this case, since the temperature of the hot water in the bathtub 47 has already decreased, it is considered that there is no fear that hot water will be discharged even if the bubble operation is performed.
[0028]
(Second Embodiment)
Further, even if the detected temperature Th of the heat exchanger temperature sensor 46 falls below a certain temperature Ts, the normal reheating operation is not immediately performed, and the detection of the heat exchanger temperature sensor 46 is performed as shown in the flowchart of FIG. The delay timer may be started when the temperature Th falls below a certain temperature Ts (S10), and when the delay timer counts up after a predetermined time has elapsed (S11), it may be shifted to a normal chasing operation.
[0029]
(Third embodiment)
Moreover, in the said embodiment, although the operation | movement was branched by one comparison temperature Ts, you may use two comparison temperature Ts1 and Ts2 (Ts1> Ts2). That is, as shown in the flowchart of FIG. 9, the detected temperature Th of the heat exchanger temperature sensor 46 is compared with Ts1 and Ts2 (S12). (1) If the detected temperature Th is higher than Ts1, the oil burner 6 is not burned, and the bubble generation bypass passage 37 is opened to circulate hot water through the bath-side heat exchanger 4 and the bubble generation bypass passage 37 (S3 to S5). (2) The detected temperature Th is higher than Ts2. If it is higher and lower than Ts1, the hot oil is circulated to the bath-side heat exchanger 4 without burning the oil burner 6 and the bubble generating bypass passage 37 is closed (S13 to S15). When the temperature Th is lower than Ts2, the oil burner 6 may be burned, and the bubble generating bypass 37 may be closed to perform a normal reheating operation (S6 to S9).
[Brief description of the drawings]
FIG. 1 is a configuration diagram illustrating a bath water heater according to an embodiment of the present invention.
FIGS. 2A and 2B are schematic cross-sectional views showing the structure of a three-way valve.
FIG. 3 is a flowchart for explaining an operation during a chasing operation.
FIG. 4 is a schematic view showing a state of reheating operation by the bath water heater as above.
FIG. 5 is a schematic view showing another state of the chasing operation by the bath water heater.
FIG. 6 is a schematic view showing a state in which a bubble operation is performed in the above bath water heater.
FIG. 7 is a schematic view showing a state in which a chasing operation is interrupted when a bubble operation is performed in the above bath water heater.
FIG. 8 is a flowchart for explaining an operation during a chasing operation according to another embodiment of the present invention;
FIG. 9 is a flowchart for explaining an operation during a chasing operation according to still another embodiment of the present invention.
[Explanation of symbols]
3 Hot water supply side heat exchanger 4 Bath side heat exchanger 36 Bath side bypass pipe 37 Bypass passage 39 for generating bubbles Circulation pump 42 Three-way valve 44 Two-way valve

Claims (1)

The hot water supply side heat exchanger and the bath side heat exchanger are placed in the same can and heated by the combustion device, and a recirculation circuit for reheating is constructed between the bathtub's circulation fittings and the bath side heat exchanger. In the bath water heater provided with a bypass path in the circulation circuit so as to bypass the bath-side heat exchanger, and provided with means for opening and closing the bypass path,
When the temperature of the hot water supply side heat exchanger or bath side heat exchanger is higher than a certain temperature, the bypass path is opened by the bypass path opening and closing means, and the hot water in the bathtub is supplied to the circulation circuit without burning the combustion device. Circulate,
When the temperature of the hot water supply side heat exchanger or bath side heat exchanger falls below a certain temperature, the bypass path is closed by the bypass path opening and closing means, the combustion device is burned, and the bath side heat exchanger of the circulation circuit is bathed reheating operation control method of the wind Lu water heater it characterized by circulating hot water.

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