JP2861521B2 - 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 with water regulating valve in the target darken hot water temperature T _2C of the bathtub, wherein _{T 2C = {T Q (T} Q -Tc) Q
₁ + 25 · G · Tc｝ / ｛Q ₁ (T _Q -Tc) + 25 ·
G｝, (where T _Q is the bath set temperature, Tc is the temperature of water entering the water heater, G is the number of bath kettles, Q ₁ is the amount of hot water dropped in) and set. darken are mixed hot water to control the water supply amount darken from the water supply passage to control 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 bathtub In addition, the drop operation time can be reduced. Also, connect the proportional control valve to the burner of the bathtub, the supply by the feedback control of the combustion amount of burners of the bathtub according to the bath hot water temperature T _F, the tub even when the hot water supply temperature T ₂ rises darken the bath tapping temperature T _F which is capable of adjusting a bath set temperature T _Q. Furthermore, the reduced through water to water heater water heater issue number (tapping capacity) is lowered, closed function with water regulating valve fully closed water heater issue number G ₁ and closure functions with water regulating valve There difference between the issue number G ₂ water heater stops the operation of the closure functions with water regulating valve at the time when the above maximum scale number of bathtub when being opened to a certain opening degree, the amount of water with closure function maximum scale number of differences bathtub and issue number G ₂ water heater when the control valve is fully closed water heater issue number G ₁ and closure functions with water control valve is opened to a certain degree By adjusting the opening of the water control valve with the closing function so as to be G or less, it is possible to simultaneously operate the water heater and the bath kettle during the constant dropping operation,
The dropping operation time can be reduced.

[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, has been closed function with water adjustment valve 42 for adjusting the water amount Q ₂ darken the water supply channel 41 darken is provided, darken hot water passage 43
Hot water temperature sensor 59 darken detects the hot water supply temperature T ₂ darken the downstream side of the communicating portion is provided between the water supply passage 41 darken and, hot water pipe 46 of the backflow prevention device 45 is connected to the three-way valve 25 of往管21 At the time of dropping or refilling, the three-way valve 25 is switched, and the tapping pipe line 46 communicates with the forward pipe 21.

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, dropped hot water supply sensor 58, dropped hot water temperature sensor 59, and bath kettle Hot water temperature thermistor
The detection signal from 60 is input to a controller 5 composed of a microcomputer or the like, and the control signal output from the controller 5 is a bypass water amount adjusting valve 15 with a closing function, a hot water amount adjusting valve 16, a gas amount proportional control valves 18 and 29. Are transmitted to the three-way valve 25, the water amount adjusting valve 42 with the closing function, and the drop solenoid valve 44 to be opened and closed.

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.

The hot water from the hot water supply channel 43 and the water from the cold water supply channel 41 are mixed and supplied from the hot water supply line 46.
_2C is determined as follows. Since the hot water is supplied from the water heater 1 at the bath set temperature T _Q and the dropped hot water supply amount Q ₁ , the amount of heat required to raise the dropped water supply amount Q ₂ to the bath set temperature T _Q and the heating amount of the bath kettle 2 Should be the same, and if the number of the bath kettle 2 is G, G = (T _Q
-T ₂₎ · Q _{2/25 next, Q 2 = 25 · G /} (T Q -T
₂ ) On the other hand, since the drop water temperature from the drop water channel 41 is equal to the water input temperature Tc to the water heater 1,
_{T Q · Q 1 + Tc ·} Q 2 = T 2C (Q 1 + Q 2) , and the
The target dropping hot water supply temperature T _2C is T _2C = (T _Q · Q ₁ +
_{Tc · Q 2) / (Q} 1 + Q 2) = {T Q (T Q -Tc)
Q ₁ + 25 · G · Tc｝ / ｛Q ₁ (T _Q −Tc) + 25 ·
G｝, and the calculated target dropping hot water supply temperature T
_{In 2C} , the dropping hot water supply temperature T ₂ detected by the dropping hot water supply temperature sensor 59 (or, at the time of automatic dropping, since the dropping hot water supply temperature T ₂ is equal to the circulating water temperature T _I ,
The circulating water temperature T _I detected by the circulating water temperature sensor 56 may be equal (T ₂ = T _2C ).

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. When 55 detects that the amount of circulating water to bath heat exchanger 22 is equal to or greater than a predetermined value (for example, 4.5 l / min.), It turns on, and burner 28 of bath kettle 2 starts combustion at the maximum capacity. In the bath operation sequence, the simultaneous operation of the water heater 1 and the bath 2 is started.

Next, the dropping hot water supply is interrupted, and when 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. The outgoing pipe 21 is in direct communication with the water supply regulating valve 42 with a closing function of the drop water supply passage 41 and the drop electromagnetic valve 44 of the drop water supply passage 43 are closed. When circulating heating is performed and the circulating water temperature T _I detected by the circulating water temperature sensor 56 reaches 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.

Further, when the water heater 1 and the bath kettle 2 are operated simultaneously in an area where the tap water pressure is low, the burner 28 of the bath kettle 2 has a maximum combustion capacity while the water supply amount Q ₂ is insufficient. in combustion, the hot water temperature T ₂ darken and water supply amount Q ₂ darken the hot water supply amount Q ₁ is obtained by mixing darken (darken hot-water supply temperature sensor 59 is detected)
Where T ₂ > T _2C = ｛T _Q (T _Q −Tc) Q ₁ + 25 · G ·
Tc｝ / {Q ₁ (T _Q −Tc) + 25 · G}, the temperature of water entering the bath heat exchanger 22 increases, and the temperature of the bath leaving hot water _TF
May exceed the bath set temperature T _Q , and in such a case, the gas amount proportional control valve 29 is feedback-controlled based on a detection signal from the bath hot water tapping temperature thermistor 60 to reduce the combustion amount of the burner 28. by adjusting, preventing an excessive increase of the hot water supply temperature T ₂ darken, bath hot water temperature T _F
Can be maintained at the bath set temperature T _Q.

Next, different embodiments will be described.
Water supply passage 41 darken the hot water supply temperature T ₂ darken to a water supply amount Q ₂ darken the hot water supply amount Q ₁ is obtained by mixing, so as to approach the target darken hot water temperature T _2C darken
The water supply adjusting valve 42 with the closing function is controlled to adjust the drop water supply amount Q _2. Therefore, when the tap water pressure is low, the drop water supply amount Q ₂ is adjusted.
₂ ), the amount of water flowing into the water heater 1 is reduced, the number of the water heaters 1 is reduced (that is, the tapping capacity is reduced), and the water heater with the closing function water amount adjusting valve 42 is fully closed. Number G of 1
If the difference between the issue number G ₂ of the water heater 1 is dropped to the maximum scale number G of the bathtub 2 (in other words when _{the first} and closure functions with water regulating valve 42 is opened to a certain opening degree, Number G ₁ and Number G ₂
At the time when the difference becomes larger than the maximum number G of the bath kettle 2), the operation of the water amount adjusting valve 42 with the closing function is stopped, and the number G ₁ of the water heater 1 when the water amount adjusting valve 42 with the closing function is fully closed. difference closing function with water adjusted such that less than the maximum scale number of bathtub 2 G and issue number G ₂ of the water heater 1 when the closing function with water regulating valve 42 is opened to a certain opening degree and When the opening degree of the valve 42 is maintained and the water flow switch 55 provided on the forward pipe 21 is turned on at a predetermined value or more, the circulation heating operation of the bath kettle 2 is started. That is, the dropped hot water supply temperature T ₂ is T ₂ = T _2C = T _Q (T _Q −Tc).
Q ₁ + 25 · G · Tc｝ / ｛Q ₁ (T _Q −Tc) + 25 ·
Controls closure function with water regulating valve 42 of the water supply passage 41 darken to reach the G}, darken when adjusting the amount of water supply Q _2, water heater when the closure function with water adjustment valve 42 is closed and issue number G ₁ of 1, in the water heater 1 of the type size G ₂ Metropolitan when closing function with water regulating valve 42 is opened to a certain opening degree, G ₁ -G ₂ ≧ G (where, G is Maximum number of bath kettles 2)
The operation of the water amount regulating valve with a closing function 42 is stopped at the time when the condition is satisfied, and the water amount regulating valve with a closing function 42 is set to G ₁ −G ₂ ≦ G
Is maintained, and when the water flow switch 55 provided on the forward pipe 21 is turned on at a predetermined value or more, the circulation heating operation of the bath kettle 2 is started (see the flowchart of FIG. 3).

[0018] With this arrangement, darken water supply amount Q ₂ is the hot water supply amount Q ₁ darken become excessive becomes too small, hot water capacity of the water heater 1 can body through water Q _H to the hot water supply heat exchanger 12 is reduced is It can be prevented that the time required for the dropping operation decreases and the time required for the dropping operation increases.

[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 (3)

(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. Target dropping hot water supply temperature T _2C
T _2C = {T _Q (T _Q −T c) Q ₁ + 25 · G · T c} /
{Q ₁ (T _Q −T c) + 25 · G} (where T _Q is the bath set temperature, T c is the temperature of water entering the water heater, G is the number of bath kettles, and Q ₁ is the amount of hot water dropped in). set Te, darken to control the water supply amount by controlling the hot water supply temperature T ₂ darken, the operation of the water heater with bathtub, characterized in that to enable simultaneous operation of the water heater and the bathtub during darken operation Control method. 2. A bath with a water heater according to claim 1, wherein a proportional control valve is connected to the burner of the bath kettle, and the combustion amount of the burner of the bath kettle is feedback-controlled in accordance with the bath outlet temperature _TF . Hook operation control method. 3. issue number of the water heater is reduced, when the closing function with water regulating valve fully closed water heater issue number G ₁ and closure functions with water control valve is opened to a certain degree When the difference from the number of water heaters G ₂ becomes equal to or greater than the maximum number of bath kettles, the operation of the water volume adjustment valve with the closing function is stopped, and the number of the water heater when the water volume adjusting valve with the closing function is fully closed. number G ₁ and the difference between the issue number G ₂ water heater when the closure function with water control valve is opened to a certain opening degree is less than or equal to the maximum scale number G of the bathtub (G ₁ -G ₂ ≦ G) The operation control method for a bathtub with a water heater according to claim 1 or 2, wherein the degree of opening of the water amount adjusting valve with a closing function is adjusted so as to be as follows.