JPS609633Y2 - Bath water circulation/water heater control circuit - Google Patents

Description

[Detailed explanation of the invention] The present invention is a one-can two-system system in which heat exchangers for a circulating circuit device using a bath water pump and a hot water supply circuit device are integrated and heated by a single burner. Related to bath water circulation and water heater control circuits.

Specifically, it provides a forced circulation bath water heating device suitable for home use, a circulation system that can also supply hot water, and an electrical control circuit for the water heater.Heating and circulation control can be controlled electrically by switch operation. The aim was to achieve ease of operation, accuracy and automation of hot water temperature control.

An embodiment of the present invention will be described below based on the drawings.

First, the structure of the circulating water heater with the original control circuit was first evaluated.
To explain with reference to the figure, 1 is a bathtub, 2 is a heat exchanger, and both constitute a closed circuit in a circulation circuit 3 with a pump P interposed on the outgoing side of the heat exchanger.

The heat exchanger 2 is of a so-called can-can two-path type, with one path connected to the bath water circulation circuit 3, and the other path connected to a water supply channel 4a and a hot water outlet channel 4b.
are connected to form a hot water supply circuit 4.

Ths is a hot water temperature detection element provided in the circulation circuit to detect the temperature of circulating hot water from the bathtub 1.

Dl is a flow sensing actuator in the circulation circuit 3, which senses the circulation flow of water in the circulation circuit and operates a circulation switch MSW1 which controls opening and closing of a main burner solenoid valve GV2, which will be described later.

In the illustrated example, the differential pressure between the circuits on both sides of the heat exchanger 2 is sensed.

Further, D2 is a running water sensing actuator of the hot water supply circuit 4, which operates the hot water supply switch MSW2 provided in the electrical circuit of the electromagnetic valve GV2 and the pump relay PR.

Reference numeral 5 denotes a cock provided at the outlet of the hot water outlet path 4b, and therefore the hot water supply circuit is of a stop type.

In the illustrated example, the hot water supply is in the form of a so-called faucet, but it goes without saying that it may also be used in a shower device or the like.

Reference numeral 6 denotes a fuel pipe whose base end is connected to a fuel supply source, and whose tip end is connected to a main burner 7 and branched from the middle to extend to a pilot burner 8 as well.

GV□ is a pilot burner solenoid valve that controls the fuel supply to the pilot burner 8, but it is provided closer to the fuel supply source than the branch to the burner, and also functions as a source valve for the main burner 7. There is.

GV2 is a main burner solenoid valve that controls fuel supply to the burner 7.

The electric control circuit of the circulation and water heater having the above structure will be explained below with reference to FIG.

A step-down transformer 10 is connected to the commercial power source 9 via a fuse F, a pump P is connected to the primary side of the transformer via a pump relay contact Pr, and a rectifier is connected to the secondary side via a power switch SW. RF is connected so that a DC power supply circuit can be obtained at that part.

The configuration of the DC circuit will be described below. THA is a temperature adjustment circuit that receives a detection signal from a hot water temperature sensing element Ths and controls the output to a hot water temperature control switch Th5w, which will be described later.

In this embodiment, the adjustment circuit is provided with a sensitivity changeover switch 11.

That is, as will be described later, the circulation function according to the present embodiment is a forced constant circulation operation in which the bath water is constantly circulated when the pump start switch is turned on, and burner heating and stop are controlled by the hot water temperature control switch Th5w, and the pump The burner is kept in the same state as the pump P, that is, the burner 7 is also burned when the pump P is in operation, and the burner is also extinguished when the burner is stopped.

Therefore, the difference between the hot water temperature at the detection part of the hot water temperature sensing element Ths and the temperature inside the bathtub 1 is small when it is "forced" and large when it is "automatic", especially when the circulation is stopped. If the ON points of the temperature control switch Th5w are at the same level, frequent activation will occur when the temperature control switch Th5w is set to "auto", which is extremely inconvenient.

Therefore, the on-point of the control switch can be set higher when in "automatic" mode than when in "forced" mode.

For example, for a set hot water temperature of 40C, the on point when "forced" is set to -0.1°C to 0.5°C, and when "automatic" is set to -1°C to 5°C, the switch mentioned above is used to change the sensitivity. 11 are provided.

12 is a sterilization circuit that sterilizes the circulating hot water in the circulation circuit 3, and is connected in series with the pump relay contact Pr and connected to the adjustment circuit TH.
Connected to A.

R1 is a temperature control relay connected in series with the hot water temperature control switch Th5w, which is turned on and off by the control signal from the adjustment circuit, and its relay contact r1 is interposed in the pump relay PR circuit and circulation switch MSW□ circuit, which will be described later. are doing.

PR is a pump relay, and this circuit is connected in series with the normally closed contact MsW21 of the hot water supply switch MSW2, the single-pole double-throw circulation changeover switch 13, and the pump start switch Psw. The fixed terminal of the switch - the blade side circuit (the right terminal in the diagram) is connected to the temperature control relay R mentioned above.
One contact point r1 is provided to make the switch circuit an automatic intermittent circulation operation circuit.

The circuit of the main burner solenoid valve Gv2 includes a contact MsW1 of the circulation switch MSW and a contact r of the temperature control relay R.
Normally open contact MS of hot water switch MSW2 in series circuit with □
A circuit formed by connecting W2□ in parallel is connected in series, and these further include an overheat prevention switch 14 that opens when the vessel is overheated due to dry firing, and an ignition relay R2 that is held and operated when the pilot burner 8 is ignited and burned. Contact r21, contact r3 of combustion relay R3 activated by heat sensitivity of thermocouple TC
□, Automatic return type pilot burner ignition switch IGs
The return side (normally closed side) terminal of w is connected to the power supply circuit.

Reference numeral L denotes a start confirmation lamp, which is connected to the relay contact r4 and switched to the electromagnetic valve GV2 circuit when necessary, and is turned on when the power switch is turned "on" at the start of operation to indicate the closed state of the power supply.

The on-side terminal of the ignition switch IGsw is connected to the relay R2 and its contact r22, the pilot burner solenoid valve GV1, and a circuit of a temperature fuse 15 that opens when the burner flame backfires or the like.

However, the above-mentioned combustion relay R3 is connected to the solenoid valve G1 circuit.
A contact r3□ is provided to cut off current to the ignition transformer IGT, which will be described later, together with the diode 16 of the valve circuit when necessary.

Furthermore, by short-circuiting the ignition relay R2 and the solenoid valve GV1 circuit midway, and by switching and connecting the relay contact r3° to the power supply circuit during operation, the circuit holding action of the relay R2 and the solenoid valve GV1 circuit are improved. The opening operation is maintained.

IGT is an ignition transformer that drives a discharge electrode (not shown), and connects the relay contact r32 and diode 16.
connected to the circuit between.

IOA is a pilot burner ignition detection circuit and is connected to a thermocouple TC, a combustion relay R3 activated by a heat-sensitive signal output by the thermocouple detecting a burner flame, and an ignition confirmation lamp PL.

Next, the operation of the above-described configuration will be explained.

The figure shows a state where the circulation switch 13 remains switched to the "forced" side and all operations are stopped, so the forced constant circulation operation will be explained first.

When the power switch SW is turned on with the bathtub 1 filled with water and the commercial power supply 9 closed, the start confirmation lamp L lights up and the water temperature detection signal from the water temperature detection element Ths is transferred to the temperature control circuit T.
HA receives this and turns on the hot water temperature control switch Th5w.

When the switch is turned on, temperature control relay R1 is activated.
Turn on the contact r□.

When the bath water temperature is lower than the set temperature, turn off the power switch SW.
When the switch is turned on, the operations described above are performed.

Then, when the ignition switch IGsw is pressed next, the start confirmation lamp L goes out and the contact r21 of the ignition relay R2
and r2゜ is turned on and pilot burner solenoid valve GV1
When the fuel is ejected from the pilot burner 8, a discharge electrode (not shown) is discharged by the ignition transformer IGT to ignite and burn the burner.

When the burner burns, the thermocouple TC is heated by the flame, and as the ignition confirmation lamp PL lights up, the combustion relay R3 is activated by the electromotive force generation signal, and its contact r3 is activated.
Switch between 1 and r3□.

The ignition switch IGsw releases its pressure after confirming that the ignition confirmation lamp RL is lit. At this time, the electrode discharge is automatically stopped by instantaneous switching of the contact r3□. Also, the solenoid valve GV1 is used for ignition. The open state is maintained by the circuit holding action of relay R2.

Thus, when the rear pump start switch Psw is turned on, the pump relay PR is activated and its contact Pr is activated when hot water is not being supplied.
(three positions in the illustration) are turned on, and the pump P is started.

When the pump P is activated, the bath water begins to circulate, and the flowing water sensing actuator D□ senses the circulation and activates the circulation switch MSW1.

When the switch contact Msw1 is turned on, the main burner solenoid valve GV2 is energized and the fuel passage is opened, so that the pilot burner 8 ignites the main burner 7 and starts heating the heat exchanger 2.

When the bath water is heated and reaches the set temperature, the hot water temperature control switch Th5w is turned off by detection by the hot water temperature detection element Ths, and therefore the contact r1 of the temperature control relay R1 is turned off and the main burner solenoid valve is turned off. Since the circuit of GV2 is opened, the solenoid valve closes the fuel passage and stops heating.

When the hot water temperature drops after the heating is stopped, the electromagnetic %V2 is activated as described above based on the detection by the hot water temperature detection element Ths, and heating is started again.

As described above, when the circulation operation changeover switch 13 is set to the "forced" side, the main burner solenoid valve G■ It only controls the opening and closing of the burner 2 and the combustion of the burner 7, and the bath water is controlled by the pump start switch P.
As long as SW is turned on, pump P will always circulate.

If the cock 5 is opened by hot water supply operation during this "forced" operation, the water supply switch MSW2 is activated by the operation of the flowing water sensing actuator D2 of the hot water supply circuit 4, and its normally closed switch contact MSW
2□ is opened and turned off to open the pump relay PR circuit, thereby stopping the pump P and turning on the normally open contact MSW2□ of the hot water supply switch.

When the pump P stops operating, the circulation of bath water stops, so the running water sensing actuator D1 also stops operating, that is, the circulation switch MSW□
When the contact MSW1 is turned off, the solenoid valve GV when heating the bath water
Open the second electric circuit.

Therefore, at this time, the solenoid valve G■2 circuit is opened and turned off regardless of whether the hot water temperature control switch Th5w is on or off, but since the normally open contact MSW2□ of the hot water supply switch is on due to the hot water supply operation. The electromagnetic %V2 is opened and the main burner 7 can burn for hot water supply.

This is, in other words, hot water supply priority operation. When the hot water supply is stopped, the normally closed contact MsW21 of the hot water supply switch returns to ON, the normally open contact MSW22 returns to OFF, and the pump relay PR is activated, so that the circulating operation of the bath water is resumed. .

Next, automatic intermittent circulation operation will be explained, but since the ignition operation of the pilot burner 8 is as described above, it is assumed that ignition combustion has already occurred.

Therefore, when the circulation selector switch 13 is switched to the "auto" side and the pump start switch Psw is turned on, when the bath water temperature is lower than the set temperature, the water temperature control switch Th5w is turned on by the detection operation of the hot water temperature detection element Ths. When the contact r1 of the temperature control relay R□ is turned on, the pump relay PR is activated and the pump P is started.

When the pump starts, the bath water starts circulating, so the flowing water sensing actuator D□ is activated and the contact Msw□ of the circulation switch MSW1 is activated.
is turned on to close the electric circuit of the main burner solenoid valve GV2, that is, the main burner 7 is ignited and burned.

Thus, when the bath water reaches the set temperature, the water temperature detection element Ths
Upon detection of this, the hot water temperature control switch Th5w is turned off, and then the contact r□ of the temperature control relay R1 is turned off, opening the electric circuit of the pump relay PR and stopping the pump P, as well as the electric circuit of the main burner solenoid valve GV2. is opened and the solenoid valve is closed, that is, combustion in the main burner 7 is stopped.

By stopping the pump P, the ON operation of the contact Msw of the circulation switch by the flowing water sensing actuator D□ is also switched OFF, opening the electrical circuit of the solenoid valve GV2, and the double control operation is performed together with the relay contact r□. becomes.

If the hot water temperature decreases after the burner is stopped, the hot water temperature control switch Th5w is turned on as described above, the pump is started, and main burner combustion is restarted, and this process is repeated thereafter.

As described above, when the circulation changeover switch 13 is set to the "auto" side, both the pump P and the main burner solenoid valve GV2 are controlled by the operation of the temperature control relay R1.

However, when supplying hot water during this "automatic" operation, as in the case of the "forced" operation described above, switch the hot water supply switch MSW2.
The hot water supply priority control is achieved by the operation of the normally closed contact MSW21 and the normally open contact MSW2□.

Furthermore, since the present embodiment is provided with a sterilizing circuit 12 controlled by a pump relay PR, the sterilizing circuit is also activated while the bath water is being circulated, making it possible to obtain sanitary bath water.

Furthermore, in this embodiment, the bath water circulation function is provided with a switch 13 for switching between constant circulation and intermittent circulation, that is, "forced" and "automatic" operation, but it is not necessary to have both functions, and only the "automatic" side can be used in the present invention. It is possible to achieve the intended purpose.

If a constant circulation function is provided, for example, an ultrasonic bath can be used as a health device.

That is, if an appropriate air introduction device (not shown) is interposed in the discharge side circuit of the circulation circuit 3 to the bathtub 1 and "forced" operation is performed,
Since the ultrasonic effect generated by the bubble injection is continuously obtained, bathing becomes even more comfortable.

Furthermore, according to the present invention, anti-freezing can be easily activated.

That is, if there is a risk that the circulation circuit 3 may freeze in winter, do not turn off the power switch SW, leave the pilot burner 8 ignited, set the circulation changeover switch 13 to the "auto" side, and switch the pump start switch PSW to the "auto" side. If it is turned on, the automatic intermittent circulation operation will be performed based on the hot water temperature detection by the hot water temperature detection element Ths, thereby preventing the bath water from freezing.

In this case, it is clear that anti-freezing can be achieved with the pilot burner 8 extinguished.

That is, turn on the power switch SW, turn on the pump start switch P
By simply turning on sw, when the bath water temperature is lower than the set temperature, the hot water temperature control switch Th5w remains on, so the bath water continues to circulate and is prevented from freezing.

As described in detail above, according to the present invention, it is possible to provide a control circuit that exhibits excellent effects as described below in a forced circulation device with a one-can two-path type hot water supply.

All circulation heating control on the bath water side can be electrically controlled using push switches, so the device can be installed outside the bathroom and the controller inside the bathroom, allowing remote control to select the circulation switch, pump start switch, and ignition switch. Heating can be automatically controlled to the set temperature simply by operating the power switch.

Kuchi: Water temperature control is automatic, so it can be economically efficient and efficient.

(c) By enabling the circulation function to be operated by switching between constant circulation and intermittent circulation, a multi-functional device that can perform constant circulation operation by attaching appropriate equipment such as a filter, sterilizer, air introduction device, etc. to the circulation circuit. can be obtained.

2. If the hot water supply priority method is used, the heat receiving efficiency during hot water supply will not decrease.

Since the heating and stopping of the bath water is automatically controlled, there are small changes in the water temperature and it does not cool down like in a natural circulation system, so you can enjoy a comfortable bath at any time.

To connect to the bathtub, all that is needed is to connect the circulation circuit, so it is easy to replace the existing bathtub.

[Brief explanation of drawings]

Figure 1 is a circuit diagram of a circulation and water heater according to an embodiment of the present invention;
FIG. 2 is an electrical control circuit diagram. 3: Circulation circuit, 4: Hot water supply circuit, 7: Main bar, 8=
Pilot burner, 13: Circulation switch, P: Pump, PSW: Pump start switch, PR: Pump relay, ThS: Hot water temperature detection element, Th5w: Hot water temperature control switch, IGsw: Ignition switch, IGT: Ignition transformer, GVl: Solenoid valve for pilot burner, GV2: Solenoid valve for main burner, MSW□: Circulation switch, MSW2 hot water supply switch, SW: Power switch, R1: Temperature control relay, r□: Temperature control relay contact.

Claims (1)

[Scope of utility model registration request] It consists of a hot water supply circuit equipped with a running water sensing actuator, and a bath water circulation circuit equipped with a running water sensing actuator, a hot water temperature detection element that detects the temperature of circulating water from the bathtub, and a circulation pump, and a heat exchanger for both circuits. An electrical circuit for controlling the heating of a hot water heater with a single-can two-path type bath water circulation system, which is equipped with a solenoid valve that controls gas supply to each of a main burner and a pilot burner that heat the water. A series circuit of a hot water temperature control switch and a temperature control relay that are controlled to open and close, a circulation changeover switch that has a pump start switch and a contact point for the relay on one side, and a hot water supply switch that is normally closed and opened and closed by a flowing water sensing actuator on the hot water supply side. A circuit in which a series circuit consisting of contacts and a pump relay, and a series circuit consisting of a contact of a circulation switch opened and closed by a circulating water sensing actuator on the normally open contact side of the hot water supply switch and the temperature control relay contact are connected in parallel. The main burner solenoid valve circuit consists of the main burner solenoid valve and the normally closed contact of the automatic return type ignition switch installed in series, and the combustion relay that is activated by the thermoelectromotive force generation signal of the thermocouple heated by the pilot burner. A solenoid valve circuit for pilot burner ignition is connected in series to the normally open side contact of the automatic return type ignition switch via the contact of the pump relay circuit. The control relay allows selection between forced constant circulation operation and automatic intermittent circulation operation, and the opening and closing of the main burner solenoid valve is controlled by the temperature control relay and the circulation switch of the bath water circulation circuit, and the pump relay and the main burner solenoid valve A bath water circulation and water heater control circuit characterized in that a valve is controlled in a hot water supply priority manner by interposing a hot water supply switch.