JPH0544997A - Operation control method of bath boiler with hot water supplier - Google Patents

Abstract

PURPOSE:To effect drop-in into a bathtub by the simultaneous operation of a hot water supplier and a bath boiler and shorten the time of drop-in operation by a method wherein the amount of drop-in supplying water is operated from the temperature of water, supplied into the hot water supplier, a bath set temperature and the maximum number of size of the bath boiler to control the same so as to be a set objective drop-in water supplying amount. CONSTITUTION:An objective drop-in water supplying amount Q2C is operated and set by a formula; Q2C=25. Gmax/(TQ-TC) from the temperature of water TC supplied into a hot water supplier 1, a bath set temperature TQ and the maximum number of size Gmax of a bath boiler. The valve travel of a water amount regulating valve 42 provided with closing function is regulated so that a drop-in supplying amount of water Q2 from a drop-in water supplying passage 41, which is mixed with the drop-in supplying hot-water from a drop-in hot-water supplying passage 43, becomes equal to the objective drop-in supplying amount of water Q2C to control the drop-in supplying hot-water temperature T2 whereby the simultaneous operation of the hot water supplier 1 and the bath boiler 2 can be effected upon the drop-in operation into the bathtub. As a result, the time of drop-in operation can be shortened. On the other hand, the set temperature TQ of bath can be obtained surely even when the pressure of water is low.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an operation control method for a bath kettle with a water heater, which is formed by integrally combining a water heater and a bath kettle.

[0002]

2. Description of the Related Art Conventionally, a bath heat exchanger for circulation heating whose both ends communicate with a bath by a circulation pipe consisting of a forward pipe and a return pipe, a burner for heating the bath heat exchanger, and a burner combustion amount Bath kettle equipped with a proportional control valve for controlling, hot water supply heat exchanger connected to the hot water supply circuit, bypass passage bypassing the hot water supply heat exchanger, can body heated by the hot water supply heat exchanger, and bypass passage The mixing device for mixing the bypass water from the, a burner for heating the hot water heat exchanger, and a bypass mixing type hot water heater with a proportional control valve for controlling the combustion amount of the burner. There is known a bath kettle with a hot water supply device that automatically connects a hot water outlet to the circulation pipe and fills the bath with hot water (for example, JP-A-62-1252).
52, JP-A-2-133755).

[0003]

However, in the above-described conventional bathtub with a water heater, when the automatic drop-in operation is performed, when the heating capacity of the water heater reaches the maximum value, or when the hot water discharge operation is the maximum hot water supply. Only when the capacity is exceeded, it is possible to operate the water heater at the same time as circulating the heating of the bath water heater, and it is possible to use the bath water heater at the same time. Due to the pressure loss due to the solenoid valve etc., the flow rate in the water heater side flow path is limited.Therefore, the water heater rarely operates beyond the maximum capacity of the water heater when the water temperature is high during the summer, etc. In areas where the water supply pressure is low, it is rare for the water heater to operate beyond the maximum capacity of hot water supply, and the water temperature is low.
Except for the operation in the state where the supply water pressure is high, there has been a problem that the drop operation must be performed only by the water heater, and the drop operation time until the drop is completed becomes long. It should be noted that it is conceivable to increase the flow path diameter in order to reduce the flow path resistance and increase the flow rate, but increasing the flow path diameter causes a problem that the bath heater with a water heater becomes large.

An object of the present invention is to positively drop water by simultaneously operating the water heater and the bath kettle without being restricted by changes in the water temperature depending on the season, supply water pressure conditions, etc. An object of the present invention is to provide a method for controlling the operation of a bath kettle with a water heater, which can shorten the operation time.

[0005]

In order to achieve the above object, an operation control method for a bath with a water heater according to the present invention comprises: a circulation path including a bath heat exchanger having a circulation pump, the circulation passage being open to the bath. A bath kettle equipped with a burner for heating the bath heat exchanger, an inlet, a hot water supply heat exchanger, a hot water outlet, a burner for heating the hot water heat exchanger, and an inlet for bypassing the hot water heat exchanger. And a hot water outlet passage, and a bypass mixing type water heater equipped with a bypass water amount adjusting valve with a closing function provided in the bypass passage, and a drop hot water supply passage branched from the hot water outlet passage In a bath kettle with a water heater, which is connected to the circulation path on the inlet side of the bath heat exchanger, branches from the water inlet upstream of the branch portion of the bypass passage, bypasses the water heater, and communicates with the hot water supply passage. Drop water supply , 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 kettle Gmax.
The target drop water supply Q _2C can be calculated by the formula Q _2C = 25 ・ Gmax./
(T _Q -Tc) calculated by setting the target water supply amount Q ₂ darken from water supply passage darken are mixed darken hot water from darken hot water passage darken water supply Q
_The hot water supply temperature T ₂ is controlled by controlling the temperature to _{2 C} to enable simultaneous operation of the water heater and the bath kettle during the operation of dropping into the bathtub, and it is possible to shorten the time of dropping operation. When the supply water pressure is low and the drop water supply amount Q ₂ is less than the target drop water supply amount Q _2C ,
The number G of the bath can be calculated by the formula G = (Q ₁ + Q ₂ ) (T _Q −
T ₂ ) / 25, (however, Q ₁ is the drop hot water supply amount, T ₂ is the hot water temperature in which drop hot water and drop hot water are mixed)
By controlling the proportional control valve of the bath kettle, the bath set temperature T _Q can be reliably obtained even if the water pressure is low.

[0006]

Embodiments of the present invention will be described with reference to the drawings.
The water heater 1 includes an inlet channel 11, an outlet channel 13, a hot water source heat exchanger 12 connected to the inlet channel 11 and the outlet channel 13, and a hot water source heat exchanger 12.
A burner 17 that heats the burner 17 and a gas amount proportional control valve 18 that controls the combustion amount of the burner 17, and a bypass passage 14 that bypasses the hot water heat exchanger 12 and communicates with the water inlet 11 and the hot water outlet 13 is provided. A bypass water amount adjusting valve 15 with a closing function is provided in the bypass passage 14, and a hot water amount adjusting valve 16 for adjusting the mixed hot water amount to the hot water discharging passage 13 downstream of the confluence of the hot water discharging passage 13 and the bypass passage 14 is provided. Is provided, and the can body water temperature sensor 51 for detecting the can body water temperature Tc that is supplied to the hot water supply heat exchanger 12 in the water inlet path 11, and the can body water flow rate for detecting the can body water flow rate Q _H as well. 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 hot water temperature sensor 54 for detecting the mixed hot water temperature T _M is provided in the hot water discharge path 13 between the confluence of the hot water discharge path 13 and the bypass path 14 and the water amount control valve 16. During general hot water supply operation to the kitchen, shower, etc., the opening degree of the bypass water amount adjusting valve 15 with closing function and the hot water amount adjusting valve 16 is adjusted to adjust the can body water flow rate Q _H and the bypass water flow rate Q _B, and both After mixing, the mixed hot water temperature T _M is controlled.

The bath kettle 2 includes a forward pipe 21, a return pipe 23 having one end communicating with the bath 3 and an opening, a bath heat exchanger 22 connected to the forward pipe 21 and the return pipe 23, and a bath heat exchanger 22. Burner for heating 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 outward pipe 21, and the three-way valve 25 and the three-way valve 25 are bypassed on the suction side of the circulation pump 24. A water flow switch 55 that is connected to a drop-in bypass 26 that includes a check valve 27 and that detects the circulating water flow rate to the bath heat exchanger 22, and a circulation that detects the circulating water _input temperature T _I to the bath heat exchanger 22. A water temperature sensor 56 and a three-way valve are installed.
25 is connected to the outward path 20 with one end open to the bathtub 3,
A water level sensor 57 for detecting the water level in the bathtub 3 is provided on the outward path 20, and a bath kettle hot water temperature thermistor 60 for detecting the bath kettle hot water temperature T _F is provided on the return pipe 23. During normal bath circulation heating, The three-way valve 25 connects the outward pipe 21 and the outward passage 20,
By driving the circulation pump 24, the water in the bathtub 3 is circulated and heated in the bath heat exchanger 22, and the water is returned from the return pipe 23 to the bathtub 3.
To reflux.

A drop hot water supply passage 43 is branched from the hot water discharge passage 13 on the downstream side of the hot water discharge amount adjusting valve 16, and a drop solenoid valve 44 and a drop hot water supply amount sensor 58 for detecting the drop hot water supply amount Q ₁ are provided in the drop hot water supply passage 43. It is provided and opened to connect to the backflow prevention device 45, and the bypass passage 14 on the side of the water heater 1 is provided.
Inlet channel 11 upstream from the branch of
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 A drop hot water supply temperature sensor 59 for detecting the drop hot water supply temperature T ₂ is provided on the downstream side of the communicating portion between the drop hot water supply passage 43 and the drop water supply passage 41, and the hot water supply pipe 46 of the backflow prevention device 45 is provided as a forward pipe. It is connected to the three-way valve 25 of 21 and the three-way valve 25 is switched at the time of dropping or refilling the water, and the hot water outlet pipe line 46 makes the outgoing pipe 21
Be communicated to.

Each of the above sensors, that is, the can body water temperature sensor 5
1, can 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 hot water supply amount sensor 58, drop hot water supply temperature sensor 59, bath kettle Hot water temperature thermistor 60
And the detection signal from the drop water supply amount sensor 61 is input to the controller 5 including a microcomputer,
The control signal output from the controller 5 is supplied to the bypass water amount adjusting valve with closing function 15, 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 with closing function 42, and the drop solenoid valve 44. It is transmitted and controlled to open and close.

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 to connect the hot water outlet pipe 46 to the outgoing pipe 21, and the electromagnetic solenoid valve 44 of the hot water supply passage 43 is opened to set the water heater 2 at the set temperature Ts = bath. Set temperature T _Q
The hot water supply operation is started at, a part of the hot water having the mixed hot water temperature T _M supplied from the hot water discharge pipe 46 is supplied from the three-way valve 25 to the bath heat exchanger 22 via the forward pipe 21, and the rest is dropped into the bypass passage 26.
Is supplied to the bathtub 3 via the outward path 20 from the can, and the can body water flow sensor 52 for detecting the can body water flow rate Q _H provided in the water inlet path 11 and the drop hot water supply provided in the drop hot water supply path 43 When the drop hot water supply amount sensor 58 that detects the amount Q ₁ detects water flow, that is, when water supply is detected, the water heater 1 enters the automatic hot water supply operation sequence.

The water quantity 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 path 43 and the water from the drop water supply path 41 are mixed and supplied from the hot water outlet line 46. Yes, part of the hot water supplied from the hot water outlet pipe 46 is supplied from the three-way valve 25 to the bath heat exchanger 22 via the outward pipe 21, and the rest is supplied from the drop-in bypass passage 26 to the bathtub 3 via the outward passage 20. (Outgoing pipe 21 and drop-in bypass
The split flow rate to 26 is determined by the dropped hot water supply amount and the flow path 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 bath kettle 2.

Hot water is supplied from the water heater 1 at the set bath temperature T _Q and the drop water supply amount Q ₁ , and the drop water supply amount Q
_The amount of heat required to raise ₂ to the bath set temperature T _Q ,
Since the heating amount of bathtub 2 may be coincident, when the issue number of the bathtub 2 G, the maximum scale number Gmax. To, 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 It

When the drop-in hot water supply amount (Q ₁ + Q ₂ ) supplied from the hot water outlet pipe line 46 exceeds a predetermined amount, the water flow amount to the bath heater heat exchanger 22 increases, and the water flow switch provided in the outflow pipe 21. When 55 detects that the circulating water flow rate to the bath heat exchanger 22 is a predetermined value (for example, 4.5 l / min.) Or more, it turns on, and the burner 28 of the bath kettle 2 starts combustion with the maximum capacity Gmax. Then, the bath operation sequence is entered, and the simultaneous operation of the water heater 1 and the bath kettle 2 is started.

Next, when the drop hot water supply is interrupted and the water level sensor 57 provided on the outward 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 to the outward path 20. Directly connects the upstream pipe 21 with the incoming pipe 41
The water amount adjusting valve 42 with a closing function and the drop solenoid valve 44 of the drop hot water supply passage 43 are closed, the operation of the circulation pump 24 is started, the water in the bathtub 3 is circulated and heated, and the circulation water temperature sensor 56 detects it. circulation incoming water temperature T _I is a bath set temperature T _Q to
When the temperature reaches, the heating operation is stopped.

As described above, the bypass mixing type water heater having a small pressure loss is used as the water heater, and
By connecting the drop water supply passage 41 to the downstream side of the drop solenoid valve, it is possible to pass a large amount of water without increasing the diameter of the flow path, and further, in the drop operation, the water heater 1 It becomes possible to simultaneously operate the bath and the bath kettle 2, and the drop-in time is shortened.

Next, a different embodiment will be described.
When the water heater 1 and the bath kettle 2 are operated at the same time in a region where the tap water pressure is low, the amount of dropped water supply Q ₂ is insufficient,
Target drop water supply Q _2C = 25 ・ Gmax./(T _Q −
When it is less than T ₂ ) (Q ₂ <Q _2C ), if the burner 28 of the bath kettle 2 burns with the maximum burning capacity against this insufficient drop water supply amount Q ₂ , drop hot water supply amount Q ₁ and drop water supply The drop hot water supply temperature T ₂ (detected by the drop hot water supply temperature sensor 59) obtained by mixing with the amount Q ₂ is 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 The feedback control of the gas amount proportional control valve 29 and the combustion amount of the burner 28 are adjusted to prevent an excessive rise in the drop hot water supply temperature T ₂ and prevent the bath hot water temperature T from rising.
_F is held at the bath set temperature T _Q, and the number G of the bath pot 2 at this time is G = (Q ₁ + Q ₂ ) (T _Q −T ₂ ) /
25, and based on this issue number G, the gas amount proportional control valve
Adjust the opening of 29.

The operation will be described with reference to the flow chart of FIG. 3. When the drop water supply amount Q ₂ is not equal to the target drop water supply amount Q _2C , the drop water supply valve 41 with the closing function water amount adjusting valve 42 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 is detected that the circulating water flow to 22 is above the specified value (4.5 l / min.) And turned on, the bath operation sequence is entered,
Number of bath kettle 2 (combustion capacity) G = (Q ₁ + Q ₂ ) (T _Q
Operating at -T ₂₎ / 25.

With this configuration, when the tap water pressure is low, the bath set temperature T _Q can be reliably adjusted by lowering the number (combustion capacity) of the bath kettle.

[0019]

Since the present invention is configured as described above, by providing a drop water supply path that bypasses the water heater and connects the water entrance path and the drop water supply path with each other, the drop hot water supply temperature is controlled, so that the season It is possible to drop the water into the bath tub by simultaneous operation of the water heater and bath kettle without being restricted by the change of the incoming water temperature due to the water supply pressure condition, the supply water pressure condition, etc. ..

[Brief description of drawings]

FIG. 1 is a schematic configuration diagram of a water heater having 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 of another embodiment of the present invention.

[Explanation of symbols]

 1 hot water heater 2 bath kettle 11 hot water inlet 12 hot water heat exchanger 13 hot water outlet 14 bypass passage 15 bypass water amount adjusting valve with closing function 16 water flow control valve 20 forward passage 21 forward pipe 22 bath heat exchanger 23 return pipe 24 circulation pump 25 three-way Valve 26 Drop-in bypass passage 27 Check valve 41 Drop-in water supply passage 42 Water quantity adjusting valve with closing function 43 Drop-in hot water supply passage 44 Drop-in solenoid valve

Claims (2)

[Claims] 1. A bath with a water heater comprising a forced circulation type bath kettle, a water heater, and a drop water supply passage branched from an outlet passage of the water heater connected to a circulation passage on the bath heat exchanger inlet side of the bath kettle. In the kettle, a drop water supply channel that branches from the water supply channel of the water heater and bypasses the water heater and communicates with the drop water supply channel, and a water quantity adjusting valve with a closing function that is installed in the drop water channel are provided to the water heater. 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 dropped water supply amount Q ₂ is less than the target dropped water supply amount Q _2C , the number G of the bath kettle is changed to the expression G
= (Q ₁ + Q ₂ ) (T _Q −T ₂ ) / 25, (where Q ₁ is the drop hot water supply amount, T ₂ is the hot water temperature obtained by mixing drop hot water and drop water supply) The operation control method for a bath with a water heater according to claim 1, wherein the proportional control valve is controlled.