JP3123769B2 - Heating control method of circulation type bath equipment - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a circulation type bath apparatus, and more particularly to a heating control method useful in a circulation type bath apparatus in which a connection portion to a bathtub has a double pipe structure.

[0002]

2. Description of the Related Art As shown in FIG. 2, a circulation type bath apparatus includes a bath circulation circuit 2 connected to a bathtub 1 and a bath circulation circuit 2.
And a control unit 3 for controlling the operation of each unit.

The bath circulation circuit 2 includes at least a bath heat exchanger 4, a circulation pump 5, a water flow switch 6, and a temperature sensor 7, and drives the pump 5 and the bath heat exchanger. The bathtub water is circulated and heated by the combustion of the burner 4a. The control unit 3 receives an operation signal from the operation unit 8 and detection signals from the water flow switch 6 and the temperature sensor 7 of the bath circuit 2, and operates the pump 5 and the burner 4a based on these signals. Control.

[0004] In the recirculation type bath apparatus described above, when reheating is performed, first, the pump 5 is activated to circulate bathtub water in the bath circulation circuit 2, and then the burner 4 a of the bath heat exchanger 4 is burned. Then start heating the bath water. Then, while the bathtub water is being circulated and heated, the temperature of the circulating bathtub water is checked by the temperature sensor 7, and the heating is continued until the temperature reaches the set temperature. When the temperature of the burner becomes equal to or higher than the set temperature and the state continues for about 3 seconds, it is determined that the fuel has been burned, and the burner 4
Extinguish a and stop heating. Thereafter, the operation of the pump 5 is also stopped. This completes a series of reheating operations.

[0005]

As shown in FIG. 2, there is a circulation type bath apparatus using a connection pipe 9 having a double pipe structure at a connection portion with the bathtub 1, as shown in FIG. This connection pipe 9
Is one in which the suction passage 9a is set at the center axis position and the discharge passage 9b is formed around the center of the suction passage 9a, which is required for installation as compared with the case where the suction passage and the discharge passage are constituted by two separate pipes. The space is small, and only one hole is required to be made in the bathroom wall and the bathtub 1, so that the workability is good.

However, the connecting pipe 9 having the double pipe structure is used.
In this case, since the suction port and the discharge port in the bathtub are close to each other, a phenomenon called a so-called short cycle is likely to occur, in which the discharge water flows into the suction port before the water spreads widely in the bathtub. When this short cycle occurs, only the bathtub water in the vicinity of the connection pipe 9 becomes high in temperature, and low-temperature bathtub water may remain in other areas. Since the high-temperature bathtub water flows in and the high temperature is detected, the control unit 3 determines that the bathtub water has been heated and stops the heating operation. For this reason, heating is stopped early even though the entire bathtub water is not sufficiently heated.

SUMMARY OF THE INVENTION The present invention has been made to address such a problem, and it is an object of the present invention to detect the temperature of the entire bathtub as accurately as possible even if a short cycle occurs, thereby eliminating the need for an early stop of heating. And

[0008]

According to the present invention, in order to achieve the above object, the bathtub water is forcibly circulated by a circulation pump.
A bath circulation circuit that heats the bath with a bath heat exchanger while sucking bath water from the bath tub into the bath circulation circuit, and a bath water heated by the bath heat exchanger from the bath circulation circuit. In a method of controlling heating of a circulation type bath apparatus in which a discharge port for discharging to the bathtub is arranged in close proximity, a step of activating a pump in response to an operation signal of heating and circulating bathtub water to a bath circulation circuit. Starting the bath water heating by burning the burner of the bath heat exchanger in relation to the bath water circulation, and determining whether the temperature of the bath water circulating in the bath circulation circuit has reached the set temperature. determining, in response to the correctness of the decision, the step of stopping or continuing the heating by the burner, before in connection to heating of the bathtub water is stopped in step, a predetermined time, the circulation of the bath water passage And the step of post-circulation to be, things
Determining whether the temperature of the bath water after the elapse of the post-circulation time has reached the set temperature, and, depending on whether the determination is correct, stopping the pump or returning to the stage of starting heating of the bath water; , The heating control system of the circulation type bath apparatus was constructed.

[0009] According to the above control method, the circulation is continued even after the temperature of the bath water becomes higher than the set temperature and the heating is stopped.
The bath water temperature is checked again. At this time, if only the area in the vicinity of the connection portion of the bath water has a high temperature, and low-temperature bath water remains in other areas, the low-temperature bath water is supplied to the temperature sensor due to continuation of circulation. , The determination of the temperature changes, and heating is performed again. On the other hand, if the whole bath water is heated above the set temperature,
Since the high temperature is detected even if the circulation is continued , the determination of the temperature does not change and the circulation is stopped.

[0010]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS The details of the present invention will be described below with reference to an embodiment shown in FIG. FIG. 1 is a flowchart showing a control method according to an embodiment of the present invention. The control method is performed from a bathtub as shown in FIG. 2 to the bath circulation circuit.
To the suction port for sucking bath water and the bath heat exchanger
More heated bath water from the bath circuit to the bath
The present invention is applied to a circulating bath apparatus in which discharge ports for discharging are arranged in proximity to each other. Therefore, the names and reference numerals of the respective parts of the apparatus are the same as those in FIG.

When reheating in such a circulation type bath apparatus, the control section 3 controls the operation of each section of the bath circulation circuit 2 by the routine shown in FIG.

First, in response to an operation signal indicating reheating, the circulation pump 5 is started in step S1. Thus, the bathtub water circulates in the bath circulation circuit 2.
At 2, it is checked whether or not the water flow switch 6 is turned on to confirm the circulation of the bath water. If the bathtub water is circulating, the burner 4 of the bath heat exchanger 4 is determined in step S3.
A is ignited and heating is started. Thus, the bathtub water is heated while circulating in the bath circulation circuit 2.

When the circulating heating starts, in step S4, the temperature of the bath water circulating in the bath circulating circuit 2 is monitored by the temperature sensor 7, and if the temperature has not reached the set temperature, the heating is continued. If the temperature of the bath water becomes equal to or higher than the set temperature and the state continues for a certain period of time (about 3 seconds), it is determined in step S5 that the water has just been burned, and the burner 4a
Fire extinguishing to stop bath water heating. The pump 5 is operated for a fixed time thereafter, and the circulation of the bathtub water by this operation is called post circulation (post-circulation). In step S6, it is determined whether or not this post-circulation has continued for a certain period of time. If the certain period of time has elapsed, the process proceeds to step S7. Check again.

At the time of the determination of the heating in step S5, the short cycle causes only the bathtub water to have a high temperature in the area near the connecting pipe 9 and a low temperature bathtub water remaining in other areas. Assuming that the temperature distribution of the water is non-uniform, at the time of the post-circulation after the heating is stopped, low-temperature bath water flows into the bath circulation circuit 2 and is detected by the temperature sensor 7 in step S7. Bath water temperature should drop. Therefore, when the heating is not completed, the determination in step S7 is No. And N
In the case of o, the process returns to step S3, and the heating of the bathtub water by the burner 4a is restarted.

On the other hand, if the entire bathtub water is heated to a temperature equal to or higher than the set temperature and the temperature distribution is uniform, the temperature of the bathtub water detected by the temperature sensor 7 will not change even if the bathtub is circulated after the heating is stopped. The temperature is high, and in this case, the heating has been completed, and the determination is the same as the determination in step S5, Yes.
, And the process proceeds to step S8. Then, in step S8, the operation of the pump 5 is stopped, and a series of reheating operations is completed.

As described above, in the present invention, the circulation
The heating is stopped after confirming the heating by re-checking the temperature and re-checking, so even if a short cycle occurs, the heating is not stopped early and the entire bath tub water becomes higher than the set temperature The firing is assured.

[Brief description of the drawings]

FIG. 1 is a flowchart of a control method according to an embodiment of the present invention.

FIG. 2 is a circuit diagram of a circulation type bath apparatus to which a control method is applied.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 Bathtub 2 Bath circulation circuit 3 Control part 4 Bath heat exchanger 4a Burner 5 Pump 6 Water flow switch 7 Temperature sensor 9 Connecting pipe

──────────────────────────────────────────────────続 き Continued on front page (58) Field surveyed (Int. Cl. ⁷ , DB name) F24H 1/00

Claims (1)

(57) [Claims] 1. The bathtub water is forced by a circulation pump (5).
A bath circulation circuit (2) for heating with a bath heat exchanger (4) while circulating , and a suction port for sucking bath water from a bath tub into the bath circulation circuit (2); and a bath heat exchanger ( And 4) responding to a heating operation signal in a method of controlling heating of a circulating bath apparatus in which a bath water heated by step 4) is arranged in close proximity to a discharge port for discharging the bath water from the bath circulation circuit (2) to the bathtub. And starting the pump (5) to circulate bathtub water through the bath circulation circuit (2) (S
1) and the bath heat exchanger burner (4)
a) burning the bath water to start heating the bath water (S)
3) and determining whether or not the temperature of the bath water circulating in the bath circulation circuit (2) has reached a set temperature, and stopping or continuing the heating by the burner (4a) depending on whether the determination is correct or not. Steps (S4, S5), In connection with the fact that the heating of the bathtub water was stopped in the previous step,
A post-circulation step (S6) in which bath water circulation is continued for a certain period of time, and whether or not the temperature of the bath water after the post-circulation time has reached the set temperature is determined. A step (S7, S8) of stopping the pump (5) or returning to the step of starting the heating of the bathtub water, comprising: