JP2000111150A - Control method for downstair bathtub - Google Patents

Abstract

PROBLEM TO BE SOLVED: To suppress low temperature boiling phenomenon while preventing air from being mixed into piping by providing means for detecting a bathtub installed downstairs, and altering various parameters in the operation control of general baths when upon detecting a bathtub installed downstairs. SOLUTION: The hot water supply heat exchanger 21 of a hot water supply heater 20 is coupled with a water supply pipe 22, and a hot water supply pipe 28 communicating with the faucet at a hot water supply place and having a pressure vessel thermistor 46. A heating branch pipe 31 is provided, on the heating side of a bath heat exchanger 13, with a bath thermal valve 5 and a drain pipe 33 having a drain plug 6 is branched therefrom. A bath return pipe 14 and a bath supply pipe 15 are coupled to the side of the bath heat exchanger being heated and the bath return pipe is provided with a bath circulation pump 16, a bath water flow switch 17 and a bath thermistor 18. The bath circulation pump communicates with one end of a drop pipe 141 having the other end communicating with the hot water supply pipe 28 through a check valve 34, a hot water pouring solenoid valve 48 and a hot water pouring quantity sensor 30. High temperature hot water is conducted to the bath circulation pump side at the time of dropping into a bath.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

TECHNICAL FIELD The present invention relates to a bath kettle on an upper floor,
The present invention relates to a control method for a downstairs bathtub in a bath heating device having a downstairs bathtub having a bathtub installed on a lower floor.

[0002]

2. Description of the Related Art Recently, bath heaters provided with a downstairs bathtub in which a bathtub is installed on an upper floor and a bathtub is installed on a lower floor are increasing due to housing circumstances and the like.

[0003]

However, in a conventional bath heating apparatus having a downstairs bath tub, the bath tub is installed on a lower floor lower by a certain distance (for example, -5 m) with respect to the installation position of the bath kettle. In this case, there is a problem that a low-temperature boiling phenomenon occurs under a low pressure because the bath circuit has a negative pressure as compared with the atmospheric pressure. If the amount of pouring water is small at the time of pouring, the pouring safety valve (negative pressure release valve) is activated, and air may be mixed into the piping, resulting in air purge failure and air in the bath circuit. If mixed, the pressure of the water level sensor fluctuates, and there is a problem that erroneous operations such as water refilling operation and bathing detection are caused. Further, if air enters the bath circuit, the circulation determination of the bath becomes unstable, and there is a problem that the presence or absence of the remaining bath water may be erroneously detected.

An object of the present invention is to provide a bath heating apparatus having a downstairs bath tub, which solves the above-mentioned problems and prevents the occurrence of a low-temperature boiling phenomenon and the entry of air into piping. It is to provide a bathtub correspondence control method.

[0005]

In order to achieve the above object, a control method for a downstairs bathtub according to the present invention comprises a bath heating apparatus having a downstairs bathtub having a bathtub installed downstairs and a bath heater installed upstairs. Control method, comprising a detecting means for detecting whether the installation state of the bathtub is downstairs, if it is determined that the installation is downstairs, the various parameters of bath operation control in the case of general installation By changing and performing bath operation,
While preventing the low-temperature boiling phenomenon in the bath piping,
It is possible to prevent air from being mixed into the pipe. Also,
If the output of the bath water level sensor at the time of bath trial operation is equal to or less than a predetermined value, it is automatically and reliably determined that the bathtub is installed downstairs by determining that the bathtub is a downstairs bathtub arranged downstairs. Can be. Further, by detecting the downstairs bathtub by a manual means such as switching of a dip switch on a substrate or changing a set value, the present invention is effective even in a device having no bath water level sensor.

[0006]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS An example of a hot water supply apparatus to which the present invention is applied will be described in brief with reference to FIG. 3. A heating heat exchanger 2 of a heating heater 1 is connected to a heating device to heat the heater. A hot water supply pipe 3 having a high temperature thermistor 19 and a heating water supply pipe 4 are connected, and a hot water supply heat exchanger 21 of a hot water supply heater 20 is connected to a water supply pipe 22 and a hot water supply location callan. The hot water supply pipe 28 having the body thermistor 46 is connected. The heating tapping pipe 3 communicates with the high-temperature heating pipe 32, and the heating branch pipe 31 is branched.
The heating branch pipe 31 is provided with the heating side of the bath heat exchanger 13, is provided with a bath heat valve 5, and is branched into a drain pipe 33 having a drain plug 6.

A heating return pipe 42 having a low-temperature heating thermistor 10 is connected to the heating water inlet pipe 4 via a heating circulation pump 7 and an expansion tank 8 having a water level detecting electrode 9. Low-temperature pipe 4 with heating
1 is connected. The water supply pipe 22 is a water input thermistor 23
And a hot water supply amount sensor 24, and a hot water pipe 28
Pipe 2 having a bypass water amount adjusting valve 26 between
5 are provided. The water supply pipe 28 has a water amount adjusting valve 44.
And a tapping thermistor 45. Water supply pipe 22
A resupply bypass pipe 43 is provided between the supply tank and the expansion tank 8. The resupply bypass pipe 43 is provided with a water tap 12 and a replenishment water solenoid valve 11.

A bath return pipe 14 and a bath going pipe 15 are connected to the heated side of the bath heat exchanger 13. The bath return pipe 14 is provided with a bath circulation pump 16, a bath water flow switch 17, and a bath thermistor 18. Bath circulation pump 16
One end of the dropping pipe 141 is communicated with the other end of the dropping pipe 141, and the other end of the dropping pipe 141 is communicated with the hot water supply pipe 28 via the check valve 34, the pouring solenoid valve 48, and the pouring water amount sensor 30.
Hot water is circulated to the bath circulation pump 16 when the water is dropped into the bath.

A pouring safety valve (negative pressure release valve) 47 is connected between the pouring water amount sensor 30 and the pouring solenoid valve 48.
The burner 38 of the heater 1 for heating and the burner 36 of the heater 20 for hot water supply are connected to a gas pipe 37 having a gas proportional valve and a capacity switching valve.

The present invention will be described with reference to the flowcharts of FIGS. Step S1 to Step S24
Until (see FIG. 1), drop-in operation control is performed. In FIG. 2, steps S25 to S34 are reheating operation control, and steps S35 to S38 are heat retention operation control. In FIG. 1, when the automatic bath operation is started, the pouring electromagnetic valve 33 is opened (S1), the hot water supply combustion of the hot water heater 20 is started (S2), and the pouring water amount sensor 30 is turned on by tapping. (S3), first set amount Q1
When (for example, 10 liters) is poured (S4), the pouring solenoid valve 33 is closed (S9).

Here, the ON determination of the pouring water amount sensor 30 in step S3 is performed by the pouring water amount sensor 30 detecting a flow rate equal to or more than the pouring lower limit flow rate q. When installing a bathtub downstairs, if the amount of pouring water is small, the inside of the pipe becomes negative pressure, and there is a concern that the pouring safety valve 47 will operate and air will be mixed into the pipe. The lower limit q is increased (for example, q = 3 liters / minute in a conventional apparatus, while q = 5 liters / minute in a downstairs bathtub).

In step S3, the pouring water amount sensor 3
When 0 is not turned on, it is confirmed that another plug (such as a curan) is opened (S7), and when the other plug is not opened, the operation is stopped as an error, that is, a failure or abnormality (S7).
8). In step S7, the other plug is opened (S
6) At time, it is determined to be normal and the pouring solenoid valve 33 is closed (S
6) After confirming that the other plug is closed (S5), the process returns to step S1.

In step S9, after the pouring solenoid valve 33 is closed, the bath circulation pump 16 is operated (S1).
0), when the bath water flow switch 17 is turned on (S11),
It is determined that water has been injected into the bath, the bath circulation pump 16 is stopped (S12), and the first set amount Q1 (10 liters) is poured by the operations from C to D (S13). If the bath water flow switch 17 is not turned on in step S11, the bath circulation pump 16 is stopped (S14), and the second set amount Q2 (for example, 60 to 7)
0 liter) (S13).

After pouring, the bath circulation pump 16 is operated (S1).
6) When the bath water flow switch 17 is turned on (S17),
It is determined that water has been injected into the bath, the bath circulation pump 16 is stopped (S20), and after a predetermined first set time T1 (for example, 60 seconds) has elapsed (S21), the bath water level is detected (S22). ), The bath water level is higher than the set water level (S2)
In case 3), the operation shifts to the reheating operation (FIG. 2). If the bath water level is lower than the set water level (S23), the remaining amount is poured and the bath water level is set to the set water level (S24), and the operation shifts to the reheating operation (FIG. 2).

In FIG. 2, when the bath water level is higher than the set water level, the bath circulation pump 16 is operated (S25),
When the bath water flow switch 17 is turned on (S26), the bath heat valve 40 is opened (S31), the operation of the heating heater 1 is started, and high-temperature hot water is allowed to flow through the bath heat exchanger 13 so that the bath water is discharged. When the temperature of the bath was raised and the bath water temperature of the bath became equal to or higher than the set temperature (S30), the bath heat valve 40 was closed (S31).
The operation of the heating heater 1 is stopped (S32). After confirming that the second set time T2 (for example, 25 seconds) has elapsed (S33), the bath circulation pump 16 is stopped (S33).
34), the reheating operation ends.

When the operation shifts to the warming operation and the water level of the bath is not within the reference range for the set value in step S35,
Hot water is supplied to raise the water level of the bath to the set value (E). When the water level rise is detected in step S36, that is, when it is determined that there is a bather, or when the heat retention interval has elapsed (S37), the process returns to step S25 (the bath circulation pump 16 is started). When the set time for the automatic operation has elapsed (S38), the bath automatic operation ends.

In the above control, it is necessary to confirm that the bathtub is installed downstairs. The method of confirming this is by switching a switch on the board or by changing the setting with a remote controller. By performing the operation manually, an expensive detection device is not required, so that the device can be formed at low cost. In addition, if the output of the water level sensor 39 during the bath trial operation is equal to or less than a predetermined value, it is determined that the bathtub is installed downstairs, so that control appropriate for the installation height of the bathtub can be performed and construction can be performed. Time setting work is not required. In addition, the state where the bathtub is installed downstairs is confirmed by remote control display, sound output, and the like.

By increasing the determination time of the bath water flow switch 17 in steps S11, S17, and S26 for determining whether the bath water level can be circulated (for example,
Conventionally, 60 seconds, 120 seconds downstairs), erroneous determination in the circulation determination can be prevented. In addition, bath water flow switch 1
7 is set to be long (for example, when the off state is detected for 0.1 second or more, the bath water flow switch 17 is determined to be off), so that the bath water flow switch 17 fluctuates due to fine bubbles. Can be canceled, and a reliable circulation determination can be made.

The second set time T2, which is the post-circulation time after the stoppage of heating damage to the bath circulation pump 16 turned on in step S25, is increased (for example, 5 seconds in the past, and 25 in the downstairs).
Seconds), by removing the residual heat of the heating hot water in the bath heat exchanger 13, it is possible to prevent the influence of the residual heating when the bath circulation pump 16 is stopped, and to prevent low-temperature boiling on the bath side. .

During the automatic operation of the bath or during the warm-up operation (10 minutes after opening or closing the thermal valve of the bath), the set temperature is lowered (for example, 80 ° C. in the past, 7 degrees downstairs).
0 ° C.), the low-temperature boiling on the bath side can be prevented, and the influence of the boiling on the water pressure sensor can be prevented. In the additional heating operation, when the bath water in the bath reaches a predetermined temperature equal to or higher than a predetermined temperature within a range in which boiling does not occur, the heating capability is reduced, whereby boiling at a low temperature can be prevented. By setting the lower limit flow rate q high (for example, 3 liters / minute in the past and 5 liters / minute downstairs) during the operation of pouring water into the bathtub, that is, the dropping operation, it is possible to prevent air from being mixed. If hot water supply is being used with another plug, pouring is started after the use of the other plug is completed in a standby state.

After it is determined that the bath circulation is being performed reliably, the water level stabilization standby time until the water level in the bathtub is stabilized is increased (for example, 45 seconds in the past, and 60 seconds in the downstairs).
Seconds), it is possible to prevent the malfunction of the water level determination due to the movement of the air in the pipe. The hot water supply apparatus to which the present invention is applied may be a bath kettle with a hot water supply function without a heating function.

[0022]

Since the present invention is configured as described above, it has the following effects. It is provided with a detecting means for detecting whether or not the installation state of the bathtub is downstairs, and when it is determined that the installation is downstairs, the bath operation is performed by changing various parameters of the bath operation control in the case of general installation. This can prevent the low-temperature boiling phenomenon in the bath piping from occurring and also prevent the air from being mixed into the piping. Further, if the output of the bath water level sensor during the bath trial operation is equal to or less than a predetermined value, it is automatically and reliably determined that the bathtub is installed downstairs by determining that the bathtub is a downstairs bathtub arranged downstairs. can do. Further, by detecting the downstairs bathtub by a manual means such as switching of a dip switch on a substrate or changing a set value, the present invention is effective even in a device having no bath water level sensor.

[Brief description of the drawings]

FIG. 1 is a flowchart showing a control operation of the present invention.

FIG. 2 is a flowchart subsequent to II in FIG. 1;

FIG. 3 is a schematic configuration diagram illustrating an example of a hot water supply device to which the present invention is applied.

[Explanation of symbols]

DESCRIPTION OF SYMBOLS 1 Heating heater, 2 Heating heat exchanger, 3 Heating hot water pipe 4 Heating water inlet pipe, 5 Bath heat valve, 20 Hot water heater 13 Bath heat exchanger, 14 Bath return pipe, 15 Bath going pipe 16 Bath circulation pump, 17 Bath water flow switch, 18
Bath thermistor 31 Heating branch pipe, 32 High temperature heating pipe, 40 Heating thermal valve 41 Heating low temperature pipe, 42 Heating return pipe

 ──────────────────────────────────────────────────続 き Continuing on the front page (72) Inventor Koji Kimura 93 Edo-cho, Chuo-ku, Kobe-shi, Hyogo Pref. (72) Inventor Hideki Nomura 93 Edo-cho, Chuo-ku, Kobe-shi Hyogo (72) Inventor Tomohiro Imai 93, Edo-cho, Chuo-ku, Kobe, Hyogo Prefecture Inside Noritz Co., Ltd. Person: Yuzo Yamamoto 93, Edo-cho, Chuo-ku, Kobe-shi, Hyogo Pref. (72) Inventor Eiichi Tsuji 93, Edo-cho, Chuo-ku, Kobe, Hyogo F-term (reference) 3L024 CC30 DD06 DD13 DD17 DD22 DD37 GG12 GG39 HH58

Claims (3)

[Claims] 1. A method for controlling a bath heating apparatus having a downstairs bathtub in which a bathtub is installed downstairs and a bath heater is installed upstairs, wherein it is detected whether or not the installation state of the bathtub is downstairs. A downstairs bathtub control method, comprising a detection means, wherein when it is determined that the installation is downstairs, various parameters of bath operation control in the case of general installation are changed to perform bath operation. 2. The downstairs bathtub control method according to claim 1, wherein if the output of the bath water level sensor during the bath trial operation is equal to or less than a predetermined value, the bathtub is determined to be a downstairs bathtub arranged downstairs. . 3. The downstairs bathtub control method according to claim 1, wherein the downstairs bathtub is detected by manual means such as switching of a dip switch on a substrate or changing a set value.