JPH0798150A - One-boiler two-channel hot-water supply apparatus - Google Patents

Abstract

PURPOSE:To provide a hot-water supply apparatus of one-boiler two-channel type whose use is highly convenient with the heating time shortened by a method wherein in additional heating of bathwater a large quantity of heat is used for the heating when the bathwater temperature is low and the quantity of heat is decreased with rise in the bathwater temperature. CONSTITUTION:There are provided a heat quantity-setting sit 23 and a feedback type heat quantity-calculating unit 25, the former for setting a set heat quantity Fs on the basis of the bathwater temperature Tf and the latter for calculating a feedback heat quantity Fb on the basis of the set heat-exchanger temperature Tzs corresponding to a set of gas burners and also on the basis of a deviation in set heat-exchanger temperature Tz. Furthermore, there are provided a burner set-selecting unit 31 which selects a combination of gas burners forming a set on the basis of the sum of a set heat quantity Fs and a feedback heat quantity Fb, a heat exchanger temperature-setting unit 33 which is controlled on the basis of information Vk relating to a selected set of burners, an igniter control sit 34, a solenoid valve control unit 35, and a proportional valve-current control unit 36.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a one-can-two-channel hot water supply device which has a plurality of burner groups and switches the burner groups when heating a bath to reheat them in a short time.

[0002]

2. Description of the Related Art It is known that a conventional one-can-two-channel hot water supply device is configured to heat a bath with a constant amount of heat from the start of additional heating to the end of additional heating.

Further, in the conventional one-can-two-channel hot water heater, since the hot water heat exchanger and the additional heat exchanger are formed on the same fin and are heated by a common burner, the additional heat alone is used. Sometimes the hot water heat exchanger heats up and the hot water in the hot water heat exchanger boils.Therefore, in order to prevent this, a temperature sensor is installed in the hot water heat exchanger to prevent the temperature from increasing during reheating. It is also known that the sensor is configured to temporarily stop the reheating when the temperature reaches a predetermined temperature.

[0004]

Since the conventional one-can-two-channel hot water heater performs additional heating with a heating amount smaller than the maximum number (heating capacity) of the hot water supply apparatus during additional heating, the capacity of the hot water supply is sufficient. There is a problem that it takes a long time to get to the bath without using it.

Further, in the conventional one-can-two-channel hot water supply system, if the heating amount at the time of additional heating is set large to shorten the time until the bath is heated up, the hot water accumulated in the heat exchanger for hot water supply There is a problem that it boils and hot water is discharged at the start of hot water supply.

The present invention has been made to solve such a problem, and the purpose thereof is to provide a highly convenient one can 2 capable of boiling a bath in a short time while preventing boiling of hot water in a heat exchanger. It is to provide a waterway water heater.

[0007]

In order to solve the above-mentioned problems, in the one-can-two-channel hot water supply device according to the present invention, a bath temperature sensor is provided in the outflow pipe of the bath circulation system, and a heat exchange temperature sensor is provided in the hot water supply heat exchanger. At the same time, the set amount of heat preset corresponding to the bath temperature detected by the bath temperature sensor and the deviation between the heat exchange set temperature preset corresponding to the burner group and the heat exchange temperature detected by the heat exchange temperature sensor Calorific value calculating means for adding and outputting the feedback calorific value calculated based on, a burner group is selected based on the calorific value information from the calorific value calculating means, and a preset proportional valve current corresponding to the selected burner group,
An electromagnetic valve and an additional heating control means for determining the heat exchange set temperature are provided, and heating control is performed by switching the burner group when heating the bath.

[0008]

In the one-can-two-channel hot water supply device according to the present invention, the calorie calculation means for outputting the calorific value corresponding to the bath temperature and the calorific value obtained by adding the feedback calorific value calculated based on the deviation between the heat exchanger set temperature and the heat exchanger temperature. Since the additional heating control means for selecting the burner group corresponding to the heat amount information from the heat amount calculating means is provided, the additional heating amount can be switched according to the bath temperature.

The one-can-two-channel hot water supply device according to the invention is
The heat exchange set temperature can be determined corresponding to the selected burner group, and the heat exchange temperature is monitored at this heat exchange set temperature, so boiling of the hot water accumulated in the hot water supply heat exchanger can be prevented, and the heat exchange set temperature can be prevented. Since heating control is performed by adding a feedback heat amount based on the deviation of the heat exchange temperature, the heating can be performed with the maximum heating amount in the range where boiling does not occur.

[0010]

Embodiments of the present invention will be described below with reference to the accompanying drawings. FIG. 1 is an overall configuration diagram of a one-can, two-channel hot water supply device according to the present invention. In FIG. 1, a one-can two-channel hot water supply device 1 is connected to a hot water supply system including a water supply pipe 2, a hot water supply pipe 4 and a hot water tap 17 connected to a hot water heat exchanger 3 and a forward heating heat exchanger 6. A bath circulation system including a pipe 5, a return pipe 7, and a bathtub 18, a control means 11, and a reheating switch 1
2A, a remote controller 12 including a bath temperature setting unit 12B, a hot water supply temperature setting unit, and the like, and burners of a gas proportional valve 14 and a gas burner 16 (for example, three gas burner groups SV1, SV2, and SV3 of 16A, 16B, and 16C). The heating unit includes an electromagnetic valve 13 including 13A, 13B, and 13C for controlling supply / stop of gas to the group, and a heating unit including an igniter 15.

Although not shown, the hot water supply system is provided with a flow rate sensor for detecting the flow rate Q in the water supply pipe 2, a water supply temperature sensor for detecting the water supply temperature Tc, and a hot water supply temperature sensor for detecting the hot water supply temperature Tm in the hot water supply pipe 4, respectively. Control during hot water supply is performed based on each sensor information. Further, the hot water supply heat exchanger 3 of the hot water supply system is provided with a heat exchange temperature sensor 10 for detecting the temperature of hot water staying in the hot water supply heat exchanger 3 or the temperature of the hot water supply heat exchanger (heat exchange temperature Tz) during reheating. .

The bath circulation system is provided with a bath temperature sensor 9 for detecting the bath temperature Tf of hot water at the outlet of the bath 18 and a circulation pump 8 for circulating bath water in the outflow pipe 5 of the bath circulation system. Reheating switch (SW) 12A
Is pressed and the bath temperature setting part 12B causes the bath temperature setting Tf to be reached.
When s is set, the circulation pump 8 is driven and the igniter 1
The gas burner 16 is ignited from 5 and the additional heating is started.

The heating section includes a solenoid valve 13, a gas proportional valve 14,
The gas burner 16 includes an igniter 15 and a gas burner 16. The gas burner 16 includes gas burner groups 16A, 16B, 16C (SV1, SV2, SV3) having a plurality of different burner numbers, and has a combination preset by the control of the control means 11. When the burner group is selected, the solenoid valves (13A to 13C) corresponding to the burner group are controlled to be opened and closed to adjust the valve opening of the gas proportional valve 14 and supply hot water based on the amount of gas supplied. And control the heating of reheating.

The control means 11 carries out various calculations, processes, and controls such as the amount of heat required for hot water supply, heating, etc., based on information such as a flow rate Q, a set temperature Ts, a hot water supply temperature Tc, and a hot water supply temperature Tm, which are not shown. Further, the control means 11 has the switch information SW from the additional heating switch 12A of the remote control device 12, the bath set temperature information Tfs from the bath temperature setting unit 12B, the bath temperature information Tf from the bath temperature sensor 9 and the heat exchange temperature sensor 10. Calculation of the amount of heat required for heating the bath based on the heat exchange temperature information Tz from the gas burner group 16 (16A to 16)
C) selection and control of the solenoid valve 13 (13A to 13C), adjustment of the gas proportional valve 14, drive control of the circulation pump 8 and prevention of boiling of hot water in the hot water supply heat exchanger 3 by monitoring the heat exchange temperature Tz. It is configured to control arithmetic operations, processing, driving, and the like.

FIG. 2 is a block diagram of a control means main part at the time of additional heating of the one-can, two-channel hot water supply device according to the present invention. Figure 2
In the above, the control means 11 is composed of a microprocessor, various interface circuits, a memory, etc., and the heat amount calculation means 20, the additional heating determination means 27, the adder 28, the circulation pump control means 29, and the additional heating control means 30. It consists of and.

The calorific value calculation means 20 includes a temperature comparison unit 21, a bath temperature storage unit 22, a calorie setting unit 23, and a set calorie storage unit 2.
4. The feedback heat amount calculator 25 and the adder 26 are provided, and the sum of the set heat amount Fs and the feedback heat amount Fb required for the additional heating is calculated, and the heat amount information Fo is output to the additional heating control means 30.

The temperature comparison unit 21 is composed of a comparison circuit such as a comparator and a sequential circuit, and inputs the bath temperature Tf detected by the bath temperature sensor 9 and the bath set temperature Tfs set by the bath temperature setting unit 12B. Bath temperature Tf
And the bath set temperature Tfs are compared with each other, and when they are equal to each other, for example, L level comparison information Tfk (= 0) is provided to the adder 28 and the circulation pump control means 29. On the other hand, when the bath temperature Tf is lower than the bath set temperature Tfs, the temperatures (Tf1, Tf2, Tf3: Tf1>Tf2> Tf3) previously stored in the bath temperature storage unit 22 by a sequential circuit (not shown).
Are sequentially called and compared with the bath temperature Tf, and when the temperature is Tf3 or lower (Tf ≦ Tf3), the temperature Tf is used as the temperature information Tfk.
(= Tf3) is output to the heat quantity setting unit 23. Similarly, the temperature comparison unit 21 determines that the bath temperature Tf is Tf3 <Tf.
When ≦ Tf2, Tf2, bath temperature Tf is Tf2 <T
When f ≦ Tf1, Tf1 is output to the heat quantity setting unit 23 as temperature information Tfk.

The heat quantity setting unit 23 sets the heat quantity Fk stored in advance in the heat quantity storage unit 24 in association with the bath temperature Tfk on the basis of the temperature information Tfk, and outputs it to the adder 26 as the heat quantity information Fs. To do.

The feedback calorie calculation unit 25 is a deviation (Tzs-Tz) between the heat exchange set temperature Tzs set by the heat exchange temperature setting unit 36 of the additional heating control means 30 and the heat exchange temperature Tz from the heat exchange temperature sensor 10. ) Based on PID (proportional,
The feedback heat quantity Fb that has been subjected to (integration, differentiation) calculation is calculated, and the feedback heat quantity information Fb is output to the adder 26. The adder 26 adds the set calorie information Fs and the feedback calorie information Fb and totals the calorie information Fo (= F).
s + Fb) is provided to the additional heating control means 30.

The reheating heating control means 30 includes a burner group selection section 31, a burner group storage section 32, and a proportional valve current control means 3.
3, an igniter control unit 34, a solenoid valve control unit 35, a heat exchange temperature setting unit 36, and the gas burner 1 based on the heat quantity information Fo.
A combination of six burner groups (16A, 16B, 16C) is selected, and ignition control of the igniter 15, current control of the gas proportional valve 14, and solenoid valve 13A are selected based on the selected burner group.
Opening / closing control of 13C is performed. Further, the additional heating control means 30 uses the hot water supply heat exchanger 3 based on the selected burner group.
The heat exchange set temperature Tzs for preventing the boiling of the inner hot water is changed.

The burner group selection unit 31 calls from the burner group storage unit 32 a combination of burner groups (SV1, SV2, SV3) stored in advance corresponding to the heat amount information Fo based on the heat amount information Fo. The information Vk is supplied to the proportional valve current control unit 33, the igniter control unit 34, the solenoid valve control unit 35, and the heat exchange temperature setting unit 36.

The proportional valve current control means 33 sends a proportional valve current I corresponding to the burner group information Vk to the gas proportional valve 14,
Adjust the amount of gas to obtain the required combustion for reheating the bath. The igniter control unit 34 sends an ignition signal Ig to the igniter 15 for a predetermined time every time the burner group information Vk is changed, and controls the ignition of the gas burner 16.

The solenoid valve controller 35 sends the valve drive signals (D1 to D3) to the solenoid valves (13A to 13A) based on the burner group information Vk.
13C) to open the solenoid valves of the gas burner group having combustion symmetry and to close unnecessary solenoid valves. Further, the solenoid valve control unit 35, when the determination signal Ho from the additional heating determination means 27 is the additional heating stop (for example, Ho is L level), or the bath temperature Tf is equal to the bath set temperature Tfs (Tfk = 0). In the case of finishing the reheating, the valve drive signal (D
All of 1 to D3) are forcibly stopped, and control is performed so as to end the additional heating.

The heat exchange temperature setting unit 36 controls the burner group information Vk.
The heat exchange set temperature Tzs corresponding to is stored in advance, and when the burner group information Vk is input, the heat exchange set temperature Tz corresponding to
zs is the feedback calorie calculator 2 of the calorie calculator 20.
5 to provide. The heat exchanger set temperature Tzs is, for example, 95 ° C. in the case of the burner group SV1, 90 ° C. in the case of the burner group SV1 + SV2, and the burner group SV1 +.
In the case of SV2 + SV3, set to 85 ° C.

When the reheating switch 12A is turned on, the circulation pump control means 29 outputs the drive signal Po based on the determination signal Ho (H level) from the reheating determination means 27 to drive the circulation pump 8. Control and reheat switch 1
When 2A is turned off, the drive signal Po is stopped and the circulation pump 8 is stopped and controlled. Further, the circulation pump control means 29
Indicates that the bath temperature Tf is equal to the bath set temperature Tfs (Tf
= Tfs), the drive signal Po is stopped based on the comparison information Tfk (= 0) to control the circulation pump 8 to stop.

FIG. 3 shows a relationship diagram of the bath temperature Tf, the number (heat quantity) F, and the burner group Vk. When the bath temperature Tf is sufficiently lower than Tf3 at the start of reheating, the temperature comparison unit 21 of the heat amount calculation means 20 outputs temperature information Tfk = Tf3, and the heat amount setting unit 23 sets the heat amount Fs corresponding to the temperature information Tf3.
(= F3) is output via the adder 26.

The burner selection unit 31 of the additional heating control means 30 selects the burner group SV1 + SV2 + SV3 corresponding to the set heat amount F3 based on the set heat amount F3, and sends this information to the heat exchange temperature setting unit 36, and the heat exchange temperature is set. The setting unit 36 sets the heat exchange set temperature T corresponding to the burner group SV1 + SV2 + SV3.
zs (for example, 85 ℃), heat exchange set temperature 85 ℃
Is provided to the feedback heat quantity calculation unit 25 of the heat quantity calculation means 20, and PID calculation is performed from the deviation from the heat exchange temperature Tz to output the feedback heat quantity Fb.

Since the heat exchange temperature Tz is close to the water temperature at the beginning of reheating, the deviation between the heat exchange set temperature Tzs and the heat exchange temperature Tz is large, the feedback heat amount Fb is also large, and the adder 26
The heat quantity Fo (= Fs + Fb) output from is F3max
Becomes In this way, at the start of additional heating, additional heating is performed based on the sufficiently large heat amount F3max.

From this state, reheating continues and the heat exchange temperature T
As z increases, the heat exchange set temperature Tzs and the heat exchange temperature T
As the deviation of z decreases, the feedback heat quantity Fb also decreases, so that the heat quantity Fo decreases from F3max to F3 at a predetermined inclination.

When the heat quantity Fo exceeds the heat quantity F2, SV1 + SV2 is selected as the burner group, and the burner group SV1 + SV is selected.
The heat exchange set temperature Tzs (for example, 90 ° C.) corresponding to 2 is set. Since the feedback heat quantity Fb is added to the set heat quantity Fs, the heat quantity Fo at the time of switching the burner group is F2ma.
It starts from x and decreases to F2 as the heat exchange temperature Tz approaches 90 ° C.

Similarly, when the heat quantity Fo falls below the heat quantity F2,
SV1 is selected for the burner group, and the amount of heat Fo decreases from F1max toward F1. When the arbitrary bath temperature Tf in FIG. 3 matches the bath set temperature Tfs, the reheating is stopped immediately.

In the above description of FIG. 3, the case where the bath temperature Tf at the start of reheating is sufficiently lower than the temperature Tf3 has been described. However, even if the bath temperature Tf at the start of reheating is any temperature from Tf1 to Tf3, the set heat quantity is set. Fs setting, gas burner group V
Selection of k (SV1 to SV3) combination, heat exchange set temperature T
It is possible to set zs and calculate the feedback heat quantity Fb, and execute the additional heating with the heat quantity Fo.

FIG. 4 shows the relationship among the number (heat quantity) F, the proportional valve current I and the burner group Vk. The valve opening of the proportional valve corresponds to the proportional valve current I, and the heat quantities F1, F2 and F3 are proportional valve current I.
The proportional valve 14 is driven by o1, and F1max, F2max,
F3max is driven by Io2.

In this embodiment, the bath temperature of the bath temperature storage unit 22 is set to Tf1 to Tf3, and the set calorie storage unit 24 is used.
The set temperatures of F1 to F3, the burner group combinations of the burner group storage unit 32 are SV1, SV1 + SV2, SV1 + SV2 +.
Although the setting is made in SV3, it may be set to an arbitrary number and set to correspond to each.

FIG. 5 shows an operational flow chart of the one-can, two-channel hot water supply device according to the present invention. Bath setting temperature Tfs during reheating
Is set and the reheating switch SW is turned on (state S0), the bath temperature Tf is compared with the bath setting Tfs (state S1), and when the bath temperature Tf is equal to the bath setting Tfs, the reheating is stopped. (State S16). On the other hand, state S
1, the bath temperature Tf is lower than the bath setting Tfs (Tf <T
fs), the bath temperature Tf is compared with the temperatures Tf3 and Tf2 stored in the bath temperature storage unit 22 (state S
2, state S4), and the gas burner group corresponding to the set heat amount Fs is SV1 + SV2 + SV3 (state S
3), SV1 + SV2 (state 5), SV1 (state 6).

Next, after setting the heat exchange set temperature Tzs corresponding to the selected gas burner group (state S7), the combustion of the gas burner is started (state 8). The bath temperature Tf is again compared with the bath set temperature Tfs (state S9), and Tf =
In the case of Tfs, the reheating is stopped (state S16), and Tf
When <Tfs, the deviation (Tzs-Tz) between the heat exchange set temperature Tzs and the actual heat exchange temperature Tz of the hot water heat exchanger 3 is PI.
The feedback calorific value Fb is calculated by performing D calculation or the like, the calorific value Fo added to the set calorific value Fs is compared with predetermined values F3 and F2 (state S11, state S13), and the calorific value F is calculated from the comparison result.
Gas burner group corresponding to o SV1 + SV2 + SV3
(State S12), SV1 + SV2 (state 14), SV1
Select again from (state 15).

The heat exchange set temperature Tzs corresponding to the selected gas burner group is reset (state S7) and the selected gas burner group is burned (state 8). Selection of gas burner group from Tzs value setting in state S7 (state S12, state 14, state S
The loop of 15) continues until the bath temperature Tf and the bath set temperature Tfs become equal. In addition, although the gas burner group is described in the present embodiment, it is needless to say that the present invention is not limited to this and can also be applied to an oil burner.
Further, the bath heating is generally referred to as reheating, but includes boiling from water and reheating from a predetermined temperature.

[0038]

As described above, according to the present invention,
The can 2 water channel hot water supply device includes a calorie calculation means and a reheating heating means. When the bath temperature is low, the can water is reheated with a large amount of heat, and the heat amount decreases as the bath temperature rises.
It can boil to the set temperature in a short time.

Also, the heat exchange set temperature can be changed according to the gas burner group, and the heating amount per unit area of the hot water heat exchanger becomes smaller than that of the single gas burner heating by heating with a plurality of gas burner groups. It is possible to realize rapid reheating while preventing boiling of the hot water accumulated in the hot water supply heat exchanger during reheating.

Therefore, it is possible to provide a highly convenient one-can-two-channel hot water supply system.

[Brief description of drawings]

FIG. 1 is an overall configuration diagram of a 1-can / 2-channel hot water supply device according to the present invention.

FIG. 2 is a block configuration diagram of a main part of control means at the time of additional heating of the one-can, two-channel water heater according to the present invention

[Fig. 3] Bath temperature Tf, number (heat quantity) F, and burner group Vk
Relationship diagram

FIG. 4 is a number (heat amount) F, a proportional valve current I, and a burner group Vk
Relationship diagram

FIG. 5 is an operation flow chart of the 1-can / 2-channel hot water supply device according to the present invention.

[Explanation of symbols]

 1 1 can 2 water channel hot water supply device 2 water supply pipe 3 hot water supply heat exchanger 4 hot water supply pipe 5 outflow pipe 6 reheating heat exchanger 7 return pipe 8 circulation pump 9 bath temperature sensor 10 heat exchanger temperature sensor 11 control means 12 remote control device 12A addition Boiler switch 12B Bath temperature setting unit 13, 13A, 13B, 13C Solenoid valve 14 Gas proportional valve 15 Igniter 16, 16A, 16B, 16C Gas burner 17 Hot water tap 18 Bath tub 20 Calorie calculator 21 Temperature comparison unit 22 Bath temperature storage unit 23 Heat quantity setting section 24 Set heat quantity storage section 25 Feedback heat quantity calculation section 26, 28 Adder 27 Reheating determination means 29 Circulation pump control means 30 Reheating heating control means 31 Burner group selection section 32 Burner group storage section 33 Proportional valve current control means 34 Ignition control unit 35 Solenoid valve control unit 36 Heat exchange temperature setting unit Tf Bath temperature fs bath set temperature Tzs heat exchanger set temperature Tz heat exchanger temperature Tfk comparative information Fs set heat Fb Feedback heat

Front page continued (72) Inventor Toru Tsuruta 43-1, Uozakihama-cho, Higashinada-ku, Kobe-shi, Hyogo Nihon Yupro Co., Ltd. (72) Inventor Hiroki Maruyama 43-1, Uozakihama-cho, Higashinada-ku, Kobe, Hyogo Nihon Inside Yupro Co., Ltd. (72) Inventor Hiroshi Miura 43-1 Uozakihama-cho, Higashinada-ku, Kobe-shi, Hyogo Nihon Yupro Co., Ltd.

Claims (1)

[Claims] 1. A one-can-two-channel hot water supply device in which a hot-water supply heat exchanger and a reheating heat exchanger are formed on the same fin to commonly heat a plurality of burner groups, and a bath temperature is provided in an outflow pipe of a bath circulation system. A heat exchanger temperature sensor is provided in the sensor and the hot water supply heat exchanger, and a preset heat quantity corresponding to the bath temperature detected by the bath temperature sensor and a heat exchanger preset according to the burner group are provided. A heat quantity calculation means for adding and outputting feedback heat quantity calculated based on a deviation between the set temperature and the heat exchange temperature detected by the heat exchange temperature sensor, and a burner group is selected based on heat quantity information from the heat quantity calculation means. , Providing preset proportional valve current corresponding to the selected burner group, solenoid valve, and additional heating control means for determining the heat exchange set temperature, and heating control by switching the burner group during bath heating 1 can 2 waterways water heater, characterized in that.