JP2867758B2 - Operation control method of bath kettle with water heater - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a method for controlling the operation of a bath water heater with a water heater and an integrated bath water heater.

[0002]

2. Description of the Related Art Conventionally, a bath heat exchanger for circulating heating, both ends of which are communicated with a bathtub by a circulating pipe comprising an outgoing pipe and a return pipe, a burner for heating the bath heat exchanger, and a combustion amount of the burner. A bath kettle having a proportional control valve for controlling, a hot water supply heat exchanger connected to a hot water supply circuit, a bypass for bypassing the hot water supply heat exchanger, and a can body hot water and a bypass for heating the hot water supply heat exchanger And a bypass mixing type water heater including a mixing device for mixing the bypass water from the heater, a burner for heating the hot water supply heat exchanger, and a proportional control valve for controlling the combustion amount of the burner. 2. Description of the Related Art There is known a bathtub with a water heater in which a hot water path is communicated with the above-mentioned circulation pipe and a bath tub is automatically filled with hot water.
No. 52, JP-A-2-133755).

[0003]

However, in the above-described conventional bathtub with a water heater, when the automatic dropping operation is performed, when the heating capacity of the water heater takes the maximum value, or when the tapping operation is performed at the maximum hot water supply operation. Only when the operation exceeds the capacity, it is possible to use the water heater and the bath water at the same time as the water heater can be circulated and heated at the same time. Since the flow rate in the water heater side flow path is limited due to the pressure loss due to the solenoid valve, etc., the water heater hardly operates beyond the maximum hot water supply capacity when the incoming water temperature is high in the summer, etc. In areas where the supply water pressure is low, it is rare for the water heater to operate beyond the maximum hot water supply capacity,
Except for the operation in a state where the supply water pressure is high, the dropping must be performed only by the water heater, and there is a problem that the dropping operation time until the dropping is completed becomes long. In order to reduce the flow path resistance and increase the flow rate, it is conceivable to increase the flow path diameter. However, when the flow path diameter is increased, there is a problem that the bathtub with a water heater becomes large.

[0004] An object of the present invention is to drop the water in the bathtub by simultaneous operation of the water heater and the bath kettle without being restricted by the seasonal change in the incoming water temperature and the supply water pressure conditions, etc. An object of the present invention is to provide an operation control method of a bath kettle with a water heater that can reduce the operation time.

[0005]

In order to achieve the above object, a method for controlling the operation of a bathtub with a water heater according to the present invention comprises: a circulation path including a bath heat exchanger having a circulation pump which is opened to communicate with a bathtub; A bath kettle provided with a burner for heating the bath heat exchanger, a water inlet, a hot water supply heat exchanger, a hot water supply, a burner for heating the hot water supply heat exchanger, and a water supply passage bypassing the hot water supply heat exchanger. A bypass mixing a hot water supply provided with a bypass passage for communicating with the hot water supply passage, a bypass water flow control valve with a closing function provided in the bypass passage, and a dropping hot water supply passage branched from the hot water supply outlet. In the bath kettle with a water heater connected to the circulation path on the inlet side of the bath heat exchanger, the water heater branches off from the water inlet channel on the upstream side of the branch part of the bypass path, and bypasses the water heater to communicate with the hot water supply path. Drop water channel , It dropped into the water supply passage provided and disposed a closed function equipped water control valve, the incoming water temperature T of the water heater
c, bath set temperature T _Q , maximum number of bath kettles Gmax.
The target drop water supply Q _2C is calculated by the formula Q _2C = 25 · Gmax. /
(T _Q -Tc) is calculated and set, and the drop water supply quantity Q ₂ from the drop water supply path mixed with the drop water supply from the drop water supply path is set to the target drop water supply quantity Q.
Controlled to _2C controls the hot water supply temperature T ₂ darken in, which allows simultaneous operation of the water heater and the bathtub when dropped into operation to the bathtub, it is possible to shorten the darken operation time. Also, low supply water pressure, when dropped into water supply Q ₂ is less than the target darken water supply amount Q _2C,
The number G of the bath kettle is calculated by the formula G = (Q ₁ + Q ₂ ) (T _Q −
T ₂ ) / 25, where Q ₁ is the amount of hot water dropped and T ₂ is the temperature of the hot water mixed with the cold water and the cold water
By controlling the proportional control valve of the bathtub, the bath set temperature _TQ can be reliably obtained even when the water pressure is low.

[0006]

DESCRIPTION OF THE PREFERRED EMBODIMENTS An embodiment of the present invention will be described with reference to the drawings.
The water heater 1 includes a water inlet channel 11, a hot water channel 13, a hot water heat exchanger 12 connected to the water inlet channel 11 and the hot water channel 13, and a hot water heat exchanger 12
And a bypass passage 14 that is provided with a gas amount proportional control valve 18 that controls the combustion amount of the burner 17 and that communicates with the water inlet passage 11 and the hot water passage 13 by bypassing the hot water supply heat exchanger 12. The bypass passage 14 is provided with a bypass water amount adjusting valve 15 with a closing function, and a hot water amount adjusting valve 16 for adjusting a mixed hot water amount to the hot water passage 13 downstream of the junction of the hot water passage 13 and the bypass passage 14. It is provided, and the can body water passage temperature sensor 51 for detecting the can body water passage temperature Tc which is passed through the hot water supply heat exchanger 12 to the inlet water passage 11, the can body through water to also detect the can body through water Q _H and the sensor 52 is disposed, can body hot water temperature sensor for detecting the can body hot water temperature T _H in pouring channel 13 near the outlet of the hot-water supply heat exchanger 12
53 is provided, and a mixed tapping temperature sensor 54 for detecting a mixed tapping temperature T _M is disposed in the tapping path 13 between the junction of the tapping path 13 and the bypass path 14 and the water amount control valve 16. kitchen, during general hot water supply operation of the shower, etc., are adjusted opening of the hot water control valve 16 out the closing function with bypass water amount adjusting valve 15 and the can body through water Q _H and a bypass water Q _B is adjusted, both The mixed hot water temperature T _M is controlled by mixing.

The bath kettle 2 comprises an outgoing pipe 21, a return pipe 23 having one end communicating with the bathtub 3, a bath heat exchanger 22 connected to the outgoing pipe 21 and the return pipe 23, and a bath heat exchanger 22. Heating burner 28
And a gas amount proportional control valve 29 for controlling the combustion amount of the burner 28, a circulation pump 24 is provided in the outgoing pipe 21, and a three-way valve 25 is provided on the suction side of the circulation pump 24, and the three-way valve 25 is bypassed. A water flow switch 55 for detecting a circulating water flow rate to the bath heat exchanger 22 and a circulation for detecting a circulating water temperature T _I to the bath heat exchanger 22 are connected to a drop-bypass path 26 having a check valve 27. An incoming water temperature sensor 56 is installed and a three-way valve
An outgoing path 20 having one end open to the bathtub 3 is connected to 25,
Water level sensor 57 for detecting the water level in the tub 3 is provided in the forward path 20, bathtub hot water temperature thermistor 60 is provided for detecting the bathtub hot water temperature T _F in return pipe 23, during normal bath circulation heating, A three-way valve 25 connects the outward pipe 21 and the outward path 20,
By driving the circulation pump 24, the water in the bathtub 3 is circulated and heated by the bath heat exchanger 22.
To reflux.

A dropping hot water supply path 43 is branched from the hot water supply path 13 downstream of the hot water supply amount adjusting valve 16. The dropping hot water supply path 43 is provided with a dropping electromagnetic valve 44 and a dropping hot water supply amount sensor 58 for detecting the dropping hot water supply amount Q _1. The hot water supply device 1 is provided with a connection opening to the backflow prevention device 45.
From the water inlet 11 upstream of the branch
There communicating with the hot water supply passage 43 darken is branched, closed function with water regulating valve 42 adjusts the water supply amount Q ₂ darken the water supply channel 41, and the water supply amount sensor 61 darken detects the water supply amount Q ₂ darken is provided darken is and hot water supply temperature sensor 59 darken detects the hot water supply temperature T ₂ darken the downstream side of the communicating portion between the water supply passage 41 darken the hot water supply passage 43 is provided darken, hot water line 46 of the backflow prevention device 45往管21 is connected to the three-way valve 25, and at the time of dropping or refilling, the three-way valve 25 is switched so that the tap water pipe 46 is connected to the outgoing pipe 21.
Is communicated to.

Each of the above-mentioned sensors, that is, the can body water temperature sensor 5
1.Body water flow rate sensor 52, can body hot water temperature sensor 53, mixed hot water temperature sensor 54, water flow switch 55, circulating water temperature sensor 56, water level sensor 57, drop-in hot water supply sensor 58, drop-in hot water temperature sensor 59, bath kettle Hot water temperature thermistor 60
And the detection signal from the drop water supply sensor 61 is input to the controller 5 including a microcomputer or the like,
The control signal output from the controller 5 is supplied to the bypass water amount adjusting valve 15 with the closing function, the hot water amount adjusting valve 16, the gas amount proportional control valves 18 and 29, the three-way valve 25, the water amount adjusting valve 42 with the closing function, and the drop solenoid valve 44. It is transmitted and controlled for opening and closing.

Next, referring to the flowchart of FIG.
The operation will be described. When the automatic dropping operation is started, the three-way valve 25 is switched, the tapping pipe line 46 is communicated with the forward pipe 21, the dropping solenoid valve 44 of the dropping hot water supply path 43 is opened, and the water heater 2 is set at the set temperature Ts = bath. Set temperature T _Q
, A part of the hot water having the mixed hot water temperature T _M supplied from the hot water supply line 46 is supplied from the three-way valve 25 to the bath heat exchanger 22 via the outgoing pipe 21, and the remainder is dropped into the bypass passage 26.
From is intended to be supplied to the tub 3 via the forward path 20, a can body through water sensor 52 for detecting the can body through water Q _H provided in inlet water passage 11, darken provided hot water path 43 darken hot water detecting the darken hot water supply amount sensor 58 transgressions passed through detecting the amount Q _1, i.e. when water is supplied detection, water heater 1 enters the automatic hot water supply operation sequence.

The water amount adjusting valve 42 with a closing function of the drop water supply channel 41 is opened, and the hot water from the drop hot water supply channel 43 and the water from the drop water supply channel 41 are mixed and supplied from the hot water supply line 46. Some of the hot water supplied from the hot water supply pipe 46 is supplied from the three-way valve 25 to the bath heat exchanger 22 via the outgoing pipe 21, and the remainder is supplied from the drop-in bypass path 26 to the bath tub 3 via the outward path 20. (Outgoing pipe 21 and drop-bypass
(The ratio of the flow divided into 26 is determined by the amount of hot water dropped and the flow resistance of both flow paths), so that a large amount of hot water can be supplied without increasing the diameter of the flow path of the bathtub 2.

Hot water is supplied from the water heater 1 at a bath set temperature T _Q and a dropped hot water supply amount Q _1.
The amount of heat required to raise ₂ to the bath set temperature T _Q ,
Since it is only necessary that the amount of heating of the bath kettle 2 matches, if the number of the bath kettle 2 is G and the maximum number is Gmax., G = (T _Q −T
₂₎ · Q _2/25, and the target darken water supply amount Q _2C is
Is calculated by the equation _{Q 2C = 25 · Gmax./(T Q -T} 2), is dropped into the opening of the water supply amount Q ₂ is the target darken water supply amount Q _2C in equal manner closing function with water adjustment valve 42 is adjusted You.

When the amount of hot water supplied from the hot water supply line 46 (Q ₁ + Q ₂ ) exceeds a predetermined amount, the amount of water flowing into the bath heat exchanger 22 increases, and the water flow switch provided on the outgoing pipe 21 is increased. 55 turns on when it detects that the amount of circulating water to the bath heat exchanger 22 is equal to or more than a predetermined value (for example, 4.5 l / min.), And the burner 28 of the bath kettle 2 starts combustion at the maximum capacity Gmax. Then, a bath operation sequence is started, and simultaneous operation of the water heater 1 and the bath kettle 2 is started.

Next, when the dropping hot water supply is interrupted and the water level sensor 57 provided on the outgoing path 20 detects that the water level in the bathtub 3 has reached a predetermined set water level, the three-way valve 25 is switched and the outgoing path 20 is switched off. And the outgoing pipe 21 are in direct communication with each other,
The water control valve 42 with the closing function and the dropping solenoid valve 44 of the dropping hot water supply channel 43 are closed, the operation of the circulation pump 24 is started, the water in the bathtub 3 is circulated, and the temperature of the circulating water temperature sensor 56 is detected. Circulating water temperature T _I is the bath set temperature T _Q
, The heating operation is stopped.

As described above, a bypass mixing type water heater having a small pressure loss is used as the water heater.
By connecting the drop water supply channel 41 to the downstream side of the drop solenoid valve, it is possible to flow a large flow rate without increasing the diameter of the flow path. And the bath kettle 2 can be operated at the same time, and the dropping time is shortened.

Next, different embodiments will be described.
When water heater 1 and bath kettle 2 are operated at the same time in areas where tap water pressure is low, dropping water supply amount Q ₂ is insufficient,
Target drop water supply Q _2C = 25 · Gmax ./ (T _Q −
T ₂ ) (Q ₂ <Q _2C ), when the burner 28 of the bath kettle 2 burns at the maximum combustion capacity for the insufficient dropping water supply amount Q ₂ , the dropping water supply amount Q ₁ and the dropping water supply. hot water supply temperature T ₂ (darken hot-water supply temperature sensor 59 detects) darken obtained and the amount Q ₂ is _{mixed, T 2> T 2C = {} T Q (T Q -Tc) Q 1 +25 ·
G · Tc｝ / {Q ₁ (T _Q −Tc) + 25 · G},
It may bath tapping temperature T _F with the incoming water temperature is high to the bath heat exchanger 22 exceeds the bath set temperature T _Q, in such a case, based on a detection signal from the bathtub hot water temperature thermistor 60 Te amount of gas proportional control valve 29 is feedback controlled by adjusting the amount of combustion burners 28, preventing an excessive increase of the hot water supply temperature T ₂ darken, bath hot water temperature T
_F is maintained at the bath set temperature T _Q, and the number G of the bath kettle 2 at this time is G = (Q ₁ + Q ₂ ) (T _Q −T ₂ ) /
25, and based on this number G, the gas amount proportional control valve
Adjust the opening of 29.

The operation will be described with reference to the flowchart of FIG. 3. If the water supply amount Q ₂ is not equal to the target water supply amount Q _2C , the water amount adjusting valve 42 with the closing function of the water supply passage 41 must be fully opened. if further opening the water supply quantity Q ₂ darken in the large it is determined whether becomes equal to the target darken water supply amount Q _2C and the fully open closure function with water regulating valve 42, the water supply amount dropped into the water pressure shortage Q ₂ is determined to be less than the target darken water supply amount Q _2C, the water flow switch 55 bath heat exchanger provided in往管21
When it detects that the amount of circulating water to 22 is equal to or greater than the predetermined value (4.5 l / min.) And turns it on, it enters the bath operation sequence,
Number of bath kettle 2 (combustion capacity) G = (Q ₁ + Q ₂ ) (T _Q
Operating at -T ₂₎ / 25.

[0018] With this arrangement, when water pressure is low, by reducing issue number of the bathtub (the combustion capacity) and is able to reliably adjust a bath set temperature T _Q.

[0019]

According to the present invention, since the present invention is constructed as described above, a drop water supply channel is provided for bypassing the water heater and connecting the water supply channel and the drop water supply channel to control the temperature of the drop hot water. Of the water supply temperature and the water supply pressure conditions, etc., it is possible to drop into the bathtub by simultaneous operation of the water heater and the bath kettle, so that the dropping operation time can be shortened positively. .

[Brief description of the drawings]

FIG. 1 is a schematic configuration diagram of a water heater provided with a bypass to which the present invention is applied.

FIG. 2 is a flowchart showing a control operation of the present invention.

FIG. 3 is a flowchart showing a control operation according to another embodiment of the present invention.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 Hot water supply unit 2 Bath kettle 11 Inlet passage 12 Hot water supply heat exchanger 13 Outlet passage 14 Bypass passage 15 Bypass water flow control valve with closing function 16 Water flow control valve 20 Outbound 21 Outbound 22 Bath heat exchanger 23 Return tube 24 Circulation pump 25 Three-way Valve 26 Drop-off bypass path 27 Check valve 41 Drop-down water supply path 42 Water quantity adjustment valve with closing function 43 Drop-down hot water supply path 44 Drop-down solenoid valve

──────────────────────────────────────────────────続 き Continued on the front page (58) Field surveyed (Int.Cl. ⁶ , DB name) F24H 1/00 606

Claims (2)

(57) [Claims] 1. A bath with a water heater comprising a forced-circulation type bath, a water heater, and a drop-in hot water supply channel branched from a hot water outlet of the water heater connected to a circulation path on the inlet side of the bath heat exchanger of the bath water heater. In the kettle, a drop water supply channel that branches off from the water supply channel of the water heater, bypasses the water heater and communicates with the drop water supply channel, and a water volume adjusting valve with a closing function provided in the drop water supply channel are provided. the incoming water temperature Tc, bath set temperature T _Q, the target darken water supply amount Q _2C than the maximum scale number of bathtub Gmax., set by calculating the equation _{Q 2C = 25 · Gmax./(T Q -Tc} ), darken operation control method of the water heater with bathtub, characterized by controlling the water supply amount Q ₂ to the target darken water supply amount Q _2C. 2. When the drop water supply amount Q ₂ is less than the target drop water supply amount Q _2C , the number G of the bath kettle is calculated by the equation G
= (Q ₁ + Q ₂ ) (T _Q −T ₂ ) / 25 (where Q ₁ is the amount of hot water dropped, and T ₂ is the temperature of the hot water mixed with the cold water and the cold water). The operation control method for a bathtub with a water heater according to claim 1, wherein the proportional control valve is controlled.