JPS61184354A - Hot-water temperature control device of hot-water supplied having after-burning function - Google Patents

Abstract

PURPOSE:To provide a low cost hot-water temperature control device that stably controls the hot-water temperature of hot-water supply and additional burning by a method wherein the amount of combustion of a burner is controlled by driving of a proportional control valve. CONSTITUTION:The signal of a thermistor 15 for the hot-water supply provided on the outlet of a heat exchanger for hot-water supply 1 is compared and operated with the signal of a hot-water supply and hot-water temperature setting 17 of a remote control or the like by a comparator 16 while the proportional control driving section 18 is worked due to the output of a hot-water supply mode treated with the propor tional control operation section 32 for the hot-water supply and after-burning, provided in the micro-computer 31 and the hot-water supply and after-burning concurrent mode changing treatment section 33, thereafter, the proportional control valve 10 is worked and the amount of combustion of the burner 11 for the hot-water supply is controlled while the hot-water discharge temperature is controlled so as to become constant. And the proportional control valve 10 is operated to control the amount of combustion of the burner 14 for the additional burning and the hot-water temperature of a bath may be controlled so as to hold the circulating hot-water temperature constant.

Description

DETAILED DESCRIPTION OF THE INVENTION Field of Industrial Application The present invention relates to a temperature control device for a water heater with a reheating function.

Conventional Technology In recent years, composite products have been developed that combine a water heater with a bath kettle (natural circulation type), a hot water heater and a reheating device (forced circulation type), etc. as water heaters with reheating functions.

The above-described conventional water heater with reheating function will be described below with reference to the drawings.

Conventional hot water temperature control devices for water heaters with reheating function use a proportional control valve on the hot water supply side to stabilize the hot water temperature through proportional control.
On the reheating side, a solenoid valve is used for 0N-OFF combustion or H
The mainstream method was to control the hot water temperature using i-Lo-OFF combustion. It was a composite product that simply incorporated a so-called water heater and reheating machine (bath kettle) into a single box, and was extremely expensive.

FIG. 2 shows a schematic diagram of the configuration of the conventional example.

The hot water supply heat exchanger 1 is connected to the water supply port 12L and the hot water supply port 1b. 2 is a heat exchanger for reheating, and is connected to the hot water return port 2& and the hot water inlet 2b. Hot water return port 2! A pump 3 is provided in the hot water passage from L to the reheating heat exchanger 2, and a bathtub 4 is connected to the hot water return port 21L and hot water spout 2b with a connecting pipe 5, thereby forming a hot water circulation passage. An exhaust pipe 7 is connected to each of the heat exchangers 1 and 2.

The fuel passage branches from the original solenoid valve 8, passes through the hot water supply solenoid valve 9 and the proportional control valve 1o to the hot water supply burner 11, and passes through the governor 12 and the reheating solenoid valve 13 to the reheating burner 14.
are connected to each other.

A thermistor 15 for hot water supply is provided at the outlet of the heat exchanger 1 for hot water supply, and the thermistor signal is transmitted to the converter 16 and the hot water temperature setting device 1.
The proportional control valve drive unit 18 is operated by the signal No. 7, and
The proportional control valve 10 is operated to control the combustion amount of the hot water supply burner 11 so as to keep the hot water temperature constant.

On the other hand, a reheating thermistor 19 is installed at the inlet of the reheating heat exchanger 2.
The pump 3 senses the return water temperature of the bathtub 4 in which hot water is circulated, and the bathtub water temperature adjustment circuit 2o is operated by the signal from the reheating thermistor 19.

The reheating solenoid valve 13 is operated to control the combustion amount of the reheating burner 14 to control the bathtub water temperature to be constant.

Problems to be Solved by the Invention However, in the above configuration, in order to control the temperature of each hot water, the fuel passage component parts (9, 10°, 12, 13)
Moreover, since a circuit (16, 17, 18° 20) for controlling the hot water temperature is required for each of hot water supply and reheating, the cost is high.

In view of the above-mentioned problems, the present invention aims to reduce the number of parts and circuits to provide a hot water temperature control device that stably controls the hot water temperature for hot water supply and reheating at low cost.

Means for Solving the Problems In order to solve the above problems, the hot water temperature control device of the hot water heater with reheating function of the present invention has an additional system that connects to a hot water heat exchanger and a bathtub and circulates hot water using a pump. A heating heat exchanger, a hot water supply burner and a reheating burner that heat each heat exchanger, a reheating solenoid valve connected to the hot water supply burner, and each of the hot water supply and reheating solenoid valves. with a proportional control valve commonly connected to.

Connecting a hot water supply thermistor provided at the outlet of the hot water supply heat exchanger and a reheating thermistor provided at the inlet of the reheating heat exchanger through respective comparators,
A microcomputer having a hot water supply/reheating proportional control calculation unit and a hot water supply/reheating/simultaneous mode switching processing unit that receives the signals from both thermistors, and a proportional control drive unit connected to the output side of this microcomputer. and is configured to drive the proportional control valve to control the combustion amount of each of the burners.

According to the above-mentioned configuration, the present invention operates the proportional control valve with one proportional control valve drive unit, so that during hot water supply operation, the signal from the hot water supply thermistor is used to connect the hot water supply proportional control calculation unit of the microcomputer with the hot water supply/reheating unit.・The hot water mode output processed by the simultaneous mode switching unit drives the proportional control valve to control the combustion amount of the hot water supply burner, thereby stably controlling the hot water temperature.In addition, during reheating operation, the reheating thermistor signal is activated. Then, the proportional control valve is driven by the reheating mode output processed by the microcomputer's reheating proportional control calculation unit and hot water supply/reheating/simultaneous mode switching unit, and the combustion amount of the reheating burner is controlled to control the amount of hot water in the bathtub. Temperature can be controlled stably.

In addition, during simultaneous operation, the simultaneous mode output allows the proportional control valve to be driven preferentially with the output processed by the proportional control calculation section for hot water supply to keep the hot water temperature stable. The bathtub water temperature can be controlled by controlling the opening and closing of the reheating solenoid valve in the ON-OFF control range using the signal from the heating thermistor.

In addition, the number of parts can be reduced, and the calculation sections of the microcomputer can each perform program processing so as to control the water temperature optimally, so that the purpose can be achieved at low cost.

EXAMPLE An example of the present invention will be described below with reference to FIG. 1, which is a schematic diagram of the configuration.

Reference numeral 1 denotes a heat exchanger for hot water supply, which is connected to the water supply inlet 1& and the hot water supply inlet 1b, and has a water supply detection element 21 in the water supply side passage for detecting water supply and outputting a signal. 2 is a heat exchanger for reheating, and is connected to a hot water return port 2a and a hot water inlet 2b. A pump 3 and a circulating water detection element 22 for detecting the circulation of hot water are provided in the hot water passage leading from the hot water return port 2a to the reheating heat exchanger 2, and the hot water return port 2a and the hot water inlet 2b are provided with a pump 3 and a circulating water detection element 22 as shown in FIG. Similarly, the bathtubs 4 are connected by a connecting pipe 6 to form a hot water circulation passage.

An exhaust pipe 7 is connected to each of the heat exchangers 1 and 2, and a forced exhaust fan motor 23 having fan blades 24 is configured to discharge combustion exhaust gas to an exhaust port 26 through an exhaust guide 26.

Further, it is formed in a part of the case 28 so that combustion air can be supplied from the air supply port 27.

The fuel passage connects a single solenoid valve 8 and a proportional control valve 1o in series, and branches from this to a hot water supply burner 11 through a hot water supply solenoid valve 9, and a reheating burner 14 through a reheating solenoid valve 13.
Then, the proportional control valves 10 are branched and connected so that they are connected in common.

A comparator 16 compares and calculates a signal from a hot water thermistor 16 provided at the outlet of the hot water heat exchanger 1 and a signal from a hot water temperature setting device 17 such as a remote control, and the microcomputer 31
The proportional control valve drive unit 18 is operated by the hot water supply mode output processed by the hot water supply/reheating proportional control calculation unit 32 and the hot water supply/reheating/simultaneous mode switching processing unit 33 provided in the 1o is operated and the combustion amount of the hot water supply burner 11 is controlled to control the hot water temperature so that the hot water temperature is constant. On the other hand, a comparator 29 compares and calculates the signal from the reheating thermistor 19 provided at the inlet of the reheating heat exchanger 2 and the signal from the hot water temperature setting device 3o. Reheating proportional control calculation section 3
2 and the output of the reheating mode processed by the hot water supply/reheating/simultaneous mode switching processing unit 33, the proportional control valve drive unit 18 is operated, the proportional control valve 1° is operated, and the reheating burner 14 starts combustion. It is configured to control the bathtub water temperature by controlling the amount of circulating hot water and controlling the temperature of the circulating hot water at a constant level.

In addition, in order to speed up the temperature rise of the bathtub water, the proportional control valve 1
The combustion amount of the reheating burner 14 controlled by o is not proportionally controlled to the boiling temperature set by the hot water temperature setting device 3o, but is controlled at the maximum capacity, and when the boiling temperature is reached, the additional heating is performed. The program is processed to close the combustion solenoid valve 13.

The hot water supply solenoid valve 9 and the reheating solenoid valve 13 are configured to open and close when controlling the respective hot water temperatures.

Further, when hot water supply and reheating are used simultaneously, each signal of the hot water supply thermistor 16 and the reheating thermistor 19 is compared and calculated by the comparators 16 and 29, and the hot water supply and additional heating provided in the microcomputer 31 are Using the simultaneous mode output processed by the heating proportional control calculation section 32 and the hot water supply/additional heating/simultaneous mode switching processing section 33, the proportional control valve drive section 18 is operated with the output that has been preferentially processed by the hot water supply proportional control calculation processing section. Accordingly, the proportional control valve 1o is operated to control the combustion amount of the hot water supply burner 11 to control the hot water temperature so that the outlet temperature is constant, and the reheating burner 14 is The combustion amount is controlled by the combustion amount when the proportional control valve 1o is operated in the hot water supply mode. Incidentally, even if the signal from the reheating thermistor 19 is received, the reheating proportional control calculating section 32 of the microcomputer 31 ignores it. Further, the bathtub water temperature is controlled by closing the reheating solenoid valve 13 when the boiling temperature set by the hot water temperature setting device 30 is reached by the signal from the reheating thermistor 19. It is.

To explain the operation of the above embodiment, when the hot water heater (not shown) connected to the hot water supply port 1b is opened, the water supply detection element 21
A forced exhaust fan motor 23 (not shown) is configured to detect water supply and operate a hot water supply operation sequence.
rotates. Open the main solenoid valve 8, hot water supply solenoid valve 9, and proportional control valve 1o.

Keep the fuel ignited (ignition holding means not particularly shown)
. When the hot water supply burner 11 burns, the hot water supply heat exchanger 1 is heated, and the hot water is discharged from the hot water supply port 1b. The hot water temperature is detected by the hot water supply thermistor 16, and the comparator 16 sets the hot water temperature to the hot water temperature set by the hot water temperature setting device 17.
The hot water supply mode output processed by the hot water supply/reheating/simultaneous mode switching processing unit 33 of the microcomputer 31 is used for hot water supply, and the proportional control calculation unit 32 for reheating is given a control signal programmed for PID% or PI calculation. Control valve drive section 18
, and the proportional control valve 10 is operated.

The combustion amount of the hot water supply burner 11 is controlled.

On the other hand, in the hot water passage, a bathtub 4 is connected to the tips of a hot water spout 2b and a hot water return port 2b via a connecting pipe 6.

The operation switch, etc. built into a part of the hot water temperature setting device 3o (
(not shown) is turned on, the pump 3 and forced exhaust fan motor 23 rotate.

When hot water or water stored in advance in the bathtub 4 is circulated by the pump 3, the circulating water detection element 19 detects it, and the reheating operation sequence is activated. 8. Solenoid valve for reheating 13. The proportional control valve 1o is opened to maintain the ignition of the fuel (the ignition holding means is not particularly shown).

As the reheating burner 14 burns, the reheating heat exchanger 2 is heated, and hot water is circulated in the bathtub 4 through the hot water spout 2b and then to the hot water return port 2a.

Thermistor 1 for reheating circulating hot water equal to the water temperature in the bathtub 4
The microcomputer 31 controls the hot water supply temperature so that the comparator 29 reaches the hot water temperature set by the hot water temperature setting device 30.
The reheating mode output processed by the reheating/simultaneous mode switching processing section 33 sends a control signal programmed for PID or PI calculation to the hot water supply/reheating proportional control calculation section 32 (in addition, the control signal is used to quickly increase the temperature of the bathtub water temperature). Therefore, it is advisable to program the control to operate at maximum capacity until the boiling temperature is reached), operate the proportional control valve drive section 18, and then
o is operated to control the combustion amount of the reheating burner 14.

Furthermore, when hot water supply and reheating are operated at the same time, as explained above, the combustion amount of the hot water supply burner 11 is controlled preferentially to control the hot water temperature.

The combustion amount of the reheating burner 14 is controlled to follow the combustion amount of the hot water supply burner 11.

However, the signal from the reheat thermistor 19 causes the hot water temperature setting device 3o to
When the boiling temperature set in is reached.

The reheating solenoid valve 13 is controlled by the simultaneous mode output of the hot water supply/reheating/simultaneous mode switching processing section 33 of the microcomputer 31 to close the reheating solenoid valve 13.

The proportional control valve 1o has a pressure control valve part using a diaphragm, and a type that controls pressure by electromagnetic force is effective in the present invention.

Furthermore, it is effective to make the comparators 1e and 29 the same, and to make the hot water supply thermistor 16 and the reheating thermistor 19 the same.

The proportional control calculation unit 32 for additional heating for hot water supply of the microcomputer 31 controls the combustion amount of the hot water supply burner 11 and the additional heating burner 14 by driving the proportional control valve 10 to achieve optimal hot water temperature control for each. The purpose was achieved by programming the calculation program to the best possible extent.The program capacity of the microcomputer 31 allows for sufficient bathtub hot water production without incorporating the calculation program for reheating the hot water supply calculation program. Temperature can also be controlled.

This is because circulating hot water does not have sudden load fluctuations like hot water supply, so even if the same calculation program is used, there is no problem in operation. It is also possible to make it cheaper.

Effects of the Invention As described above, the present invention provides a hot water supply heat exchanger, a reheating heat exchanger that is connected to a bathtub and circulates hot water using a pump, a hot water supply burner that heats each of these heat exchangers, and a reheating heat exchanger that is connected to a hot water supply heat exchanger and a bathtub and circulates hot water using a pump. a burner, a hot water supply solenoid valve connected to the hot water supply burner, a reheating solenoid valve connected to the reheating burner, and a proportional control valve commonly connected to the hot water supply and reheating solenoid valves; A hot water supply thermistor installed at the outlet of the hot water supply heat exchanger and a reheating minuta installed at the inlet of the reheating heat exchanger are connected through their respective comparators, and the signals of both thermistors are For hot water supply.

A microcomputer with a proportional control calculation section for reheating and a processing section for hot water supply, reheating, and simultaneous mode switching.

By comprising a proportional control valve driving section connected to the output side of the microcomputer, and configuring the proportional control valve to be driven to control the combustion amount of each burner, the following effects can be obtained. .

■ For both hot water supply and reheating, a single proportional control valve proportionally controls the combustion amount to control the hot water temperature, making it possible to stabilize the hot water temperature.

■ Especially since the bath water temperature can be controlled by proportional control,
Energy saving can be achieved compared to conventional hot water temperature control using Hi-Lo-OFF or ON-OFF combustion control.

■ A governor can be omitted in the fuel passage.

The number of parts is small and there is only one hot water temperature control circuit, so the cost is low.

■ The signal from the mode switching processing section allows optimal control of the hot water temperature control in both the individual operation mode and the simultaneous use mode, as well as sufficient control of the boiling temperature of the bathtub water as additional heating.

This method is more advantageous than the switching method between hot water supply and reheating.

[Brief explanation of the drawing]

FIG. 1 is a schematic diagram showing the configuration of an embodiment of the present invention, and FIG. 2 is a schematic diagram of the configuration of a conventional example. 1... Heat exchanger for hot water supply, 2... Heat exchanger for reheating. 3...Pump, 8...Original solenoid valve, 9.
... Solenoid valve for hot water supply, 10 ... Proportional control valve, 11 ... Hot water supply no (-na, 13...
Solenoid valve for reheating, 14...For reheating) (-su, 15
...Hot water supply thermistor, 16...Comparator. 18... Proportional control valve drive section, 19...
Reheating thermistor, 29... Comparator, 31...
. . . Microcomputer, 32 . . . Proportional control calculation unit for water supply and reheating, 33 . . . Hot water supply/reheating/simultaneous mode switching processing unit.

Claims (1)

[Claims] A heat exchanger for hot water supply, a heat exchanger for reheating that is connected to the bathtub and circulates hot water with a pump, a burner for hot water supply and a burner for reheating that heats each of these heat exchangers, and a hot water supply connected to the burner for hot water supply. A solenoid valve for reheating connected to the solenoid valve for reheating and a reheating burner, a proportional control valve connected in common to each of the solenoid valves for hot water supply and reheating, and a proportional control valve provided at the outlet of the heat exchanger for hot water supply. The thermistor for hot water supply and the thermistor for reheating provided at the inlet of the heat exchanger for reheating, and the proportional control calculation for hot water supply and reheating that connect these thermistors through each comparator and receive the signals from both thermistors. a microcomputer having a hot water supply/reheating/simultaneous mode switching processing section; and a proportional control valve drive section connected to the output side of this microcomputer, which drives the proportional control valve to control combustion in each of the burners. Hot water temperature control device for water heaters with reheating function that controls the amount of water