JPS6018900B2 - Bath water circulation/water heater heating control device - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention provides a one-can, two-system system in which heat exchangers for a circulation circuit device using a pump for Yuyuyu and a heat exchanger for a hot water supply circuit device are integrally installed and can be heated with one burner. This invention relates to a burner heating control device for a road-type circulation/water heater.

In detail, the so-called forced circulation type bath water heating device of the previous model has been improved to provide more accurate circulation water temperature control, more economical and safe burner heating control, and a system that prioritizes hot water supply for home use. The present invention relates to a heating control device for a circulation/water heater that is suitable for use.
Devices that forcibly circulate and heat hot water include those that use pumps to create a large public bath for commercial use, and a relatively small-capacity natural circulation heating system called a bath kettle. Exchangers equipped with a circulation enhancer such as a type 4 screw are well known.

However, in the former case, especially in public places, natural circulation heating takes time to raise the temperature of Yuyu, and the dirt in Yuyu due to many people bathing must be filtered out with a filter. It was naturally devised, and functionally it could only perform simple circulation, filtration, and heating, and there was no need for accurate water temperature control. In the latter case, the thermal efficiency could be slightly improved simply by circulating the bath water. Therefore, the inventor of the present invention aims to provide an excellent forced-circulation type water moat heating device for home use and an inexpensive circulation/heating device that can also supply hot water. As a result, we were able to develop and provide a hot water circulation/water heater having an excellent heating control device according to an embodiment as will be described later.

The bath water must be circulated by a small circulation pump. 'o) Must be a one-can, two-path type with a pre-stop hot water supply circuit and a priority type for hot water supply.

1. In view of the recent trend towards bathing health methods, it should also be possible to use ultrasonic waves by jetting air bubbles.

Q: For safety reasons, the heating control method should be a burner control method that detects circulating water, and should have a means to accurately control heating circulation by detecting the hot water temperature using a thermistor sensor.

'Village It must be able to automatically prevent water in the circulation path from freezing during the winter.

N. The conventional bathtub attached to the existing bathtub can be easily replaced without any special construction work, and the control operation is also extremely easy.

Embodiments of the present invention will be described in detail below based on the drawings. First, the schematic system structure of the control/water heater having the control device of the present invention will be explained with reference to FIG. A pump P is interposed to form a closed circuit.

The heat exchanger 2 is a so-called one-can two-path type, and one system is connected to the above-mentioned hot water circulation path 3, and the other system is connected to a water supply channel 4a and a hot water supply channel 4b to form a hot water supply circuit 4. ing. Reference numeral 5 denotes a bypass provided in the circulation path 3, which is a flow path that allows bath water to flow into the bathtub 1 without passing through the heat exchanger 2 when necessary.

TS is a thermistor sensor interposed between the branch of the bypass path 5 and the bathtub 1 on the outgoing side of the circulation path so as to detect the temperature of the circulating water from the bathtub 1. WV is a water electromagnetic valve interposed between the bypass path 5 and the heat exchanger 2 on the outgoing side of the circulation path, and when necessary, the valve is closed to allow the bath water to flow to the bypass path 5. D, is a water sensing actuator in the circulation path 3, which senses the circulating flow of water in the circulation path and activates a gas solenoid valve CV, which will be described later.
The microswitch Msw, which controls 2, is activated. In the illustrated example, the pressure difference between both ends of the heat exchanger 2 is sensed. D2 is a flowing water sensing actuator of the supply moat circuit 4, which senses the flow of water in the circuit and operates a microswitch Msw2 that controls a gas solenoid valve GV2 and a water solenoid valve WV, which will be described later. Reference numeral 6 denotes a cock provided at the hot water outlet of the hot water supply path 4b, and therefore the hot water supply circuit is 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 7 denotes a fuel pipe whose base end is connected to a fuel supply source, and is branched in the middle, one to the main burner 8 and the other to the pilot burner 9.
I am contacting you.

GV is a gas solenoid valve that sets the time for fuel supply to the main burner and pilot burner 9, and GV2 is a gas solenoid valve that controls fuel supply to the main burner 8. An electric control circuit for a circulation/water heater having the above-mentioned system path structure will be explained below with reference to FIG.

A pump P is connected to an ACIOO volt power source via a fuse F, and a main switch 12 is connected to a circuit transformed to AC 24 volts by a transformer 11, which is further rectified to DC by a rectifier RF. Pr is a pump relay contact. A thermistor amplifier TA is connected to the DC power supply circuit, and the amplifier is provided with an electric circuit for the thermistor sensor TS. In the present invention, the thermistor sensor TS includes an anti-freeze temperature sensitive circuit that turns on and off in an appropriately set low temperature range (e.g. 5°C to 100°C) and a bath water set temperature range (e.g. It has a high temperature detection circuit that turns on and off at a temperature of around 40 qo), and is connected to the circuits described later. Further, an amplifier changeover switch 13 is provided on the thermistor amplifier TA in order to allow a slight adjustment range for the high temperature detection operation of the switch depending on the circulating state of the hot water, which will be described later. R, is connected in series with the high temperature detection switch (hereinafter referred to as high temperature switch) Tsw, or connected in parallel to the power supply with a relay, and WV is connected to the micro switch Ms on the supply side. A water solenoid valve connected in series with a normally closed contact, and connected in parallel to a power source to form a water solenoid valve circuit. Psw is a pump switch connected in parallel with the antifreeze thermosensitive switch (hereinafter referred to as low temperature switch) Tpw2, and these are a changeover switch 14 and a pump relay PR that selectively switch between automatic circulation and forced circulation of bath water. They are connected in series with each other to form a pump starting circuit. Further, this changeover switch 14 is arranged to operate in conjunction with the changeover switch 13 of the thermistor amplifier TA mentioned above. The gas solenoid valve CV2 is connected to the normally open contact of the Yugata circulation side microphone o switch Msw, and the hot water supply side microswitch Msw.
The normally open contacts of w2 are connected in series with a so-called parallel circuit to form a burner circuit, and these include an overheat prevention switch 15 that prevents overheating of the heat exchanger 2 and a contact r2 of relay R2 of the burner ignition circuit. , are connected in series.
Further, a contact r of a relay R is interposed between the circuit on one side of the changeover switch 14 and the normally open contact circuit of the hot water circulation side microswitch Msw to form a temperature control relay circuit. 16 is a power confirmation lamp, igniter amplifier I
It is connected to the circuit of the gas solenoid valve GV2 so as to be alternatively switched by switching the contact r3 of the relay R3, which is activated by the heat V of the thermocouple 17 of the GA.

Reference numeral 18 denotes a thermal fuse that is attached to the heat exchanger 2 or the vessel body to prevent fires, and is connected in series with the gas solenoid valve GV.

The temperature fuse 18 and the gas solenoid valve GV form a parallel circuit with the relay R2, and are controlled to open and close by the contact r32 of the relay R3 via the contacts 2 of the relay R2. IGT is an ignition transformer, IGsw'
It is an automatic return type ignition switch, and the circuit of relay R2 is closed when the ignition is operated, and closed when the switch is reset.
PL is a pilot lamp connected to the circuit of the relay R2 and the gas solenoid valve GV, and displays the ignition state of the pilot burner 9. 19 is an appropriate load circuit connected to the thermistor amplifier TA; the example shown is a Yuyu sterilization circuit;
It has a silver electrode 20 that generates sterilizing ions, and is connected in series to the low temperature switch Tsw2 and the contact Pr of the pump relay PR.

Note that an appropriate circuit such as a pump operation indicator lamp may be connected to the load circuit 19 instead. Next, the operation of the above-described configuration will be explained.

FIG. 1 shows a state in which the bath water circulation changeover switch 14 is kept switched to the "forced" side and the bare cropping is stopped. First, we will explain the forced circulation heating operation of the bath water.

When the main switch 12 is turned on with the bathtub 1 filled with water and the ACIOO bolt source 10 opened, the rectifier R
From F', the DC power circuit becomes conductive and the power confirmation lamp 16 lights up, and the thermistor amplifier TA is activated due to the "forced" side connection state of the changeover switch 13, and the high temperature switch Tsw2 is activated when the thermistor sensor TS detects the high water temperature. ON
Therefore, contact r of relay R is turned on.

Then, when the ignition switch IGsw is pressed, the power confirmation lamp 16 goes out and the gas solenoid valve GV is activated, and at the same time fuel gas is ejected from the pilot burner 9, a discharge electrode (not shown) is discharged by the ignition transformer IGT, and the pilot burner is activated. The fuel gas from 9 is ignited and combusted. When the burner burns, the thermocouple 17 is heated and the relay R3 is operated to switch its contacts r nail and r32 and light up the pilot lamp PL, but when the ignition switch IGsw is pressed, the contacts r2 and r22 of the relay R2 are switched on.
is ○N, so after igniting the burner, press the ignition switch.
When the pressure on w is released, the discharge circuit of the ignition transformer lOT is turned off, and only the gas solenoid valve OV remains open. However, when the pump switch Psw is turned ON after the ignition switch IGsw is released, the contacts Pr of the pump relay PR turn ○N, the pump Pr turns ○N, the pump P starts, and the circulation of water starts. Sensing actuator D
, turns on the contact of the micro switch Msw by the circulation sensing operation of . Thus, the GV of the gas flow path to the main burner 8
2 is involved, the main burner 8 starts combustion and heats the water. When the temperature of the water rises due to heating and reaches the set temperature, the high temperature switch Tsw is detected by the thermistor sensor TS.
is turned off, turning off contact r of relay R, so that gas solenoid valve GV2 is closed and combustion in main burner 8 is stopped. When the hot water temperature falls below the set temperature after the combustion has stopped, the high temperature switch Tsw is turned ON by detection by the thermistor sensor TS, and the contact r of the relay R is turned ON to open the gas solenoid valve GV2 and start burner heating again. do. As described above, the circulation operation selector switch 14 is set to "forced".
When the high temperature switch Tsw is turned on and off, the contact r of the relay R is turned on and off.
F only controls the opening/closing of the gas solenoid valve GV2 to control the combustion of burner 8, and Yuyu turns the pump switch Psw to ○N.
As long as you do this, it will always be in circulation. However, when the cock 6 is engaged in order to supply flaws during the "forced" operation of the lever, the flow sensing actuator D2 of the feed circuit 4 operates the micro switch N$w2, opening its normally open contact. The water solenoid valve WV is closed and a normally open contact is established. When the water solenoid valve WV is closed, the bath water does not flow through the heat exchanger 2, but bypasses the bypass path 5 to the bathtub 1, so the running water sensing actuator D stops operating and the micro switch Ms
Turn off w, and cut off the gas solenoid valve GV2 circuit. Therefore, at this time, the gas solenoid valve CV2 is opened for bath water circulation regardless of whether the high temperature switch Tsw is ON or OFF, but the normally open contact of the micro switch N$w2 is closed due to hot water supply operation. Therefore, the water electromagnetic type °C V2 can be opened and used as a supply moat. This is an operating state in which the so-called picture bath is heated preferentially. When hot water supply is stopped, the normally open contact of the micro switch MSw2 returns to ○N, the normally open contact returns to PFF, and the water solenoid valve WV opens to resume the above-mentioned circulating action by the Yuyu hot water heat exchanger 2 flow. I will do it. Next, automatic circulation operation will be explained, but since the ignition operation of the pilot burner 9 is as described above, it is assumed that ignition combustion has already occurred. Therefore, switch the circulation operation selector switch 14 to the "auto" side and connect the pump switch Psw to ○.
When set to N, when the hot water temperature is detected by the thermistor sensor TS and the hot water is lower than the set hot water temperature, the high temperature switch Tsw is turned on.
Pump relay PR is activated by ONI of relay R, which causes pump P to start.

When the pump is started, the hot water circulates, so the running water sensing actuator ○ is activated and the contact of the micro switch Msw is activated. ON
Therefore, gas solenoid valve GV2 is involved and main burner 8
burns. When the bath water reaches the set temperature, the thermistor sensor TS detects the water temperature and turns the high temperature switch Tsw to O.
FF, contacts r of relay R are turned off, and contact Pr of pump relay PR is turned off to stop pump activation. Therefore, the contact point of the micro switch Msw is also involved, but when the contact point r of the relay R is turned OFF, the gas fin magnetic valve GV2 is closed, and the main burner 8
This will stop combustion. After the burner is stopped, if the hot water temperature decreases and the high temperature switch Tsw is turned on, heating circulation by starting the pump will start again as described above. As described above, when the circulation operation changeover switch 14 is switched to the "auto" side, the high temperature switch Tsw,
ON/OF of relay R, contact r, by ON/OF of
F controls the pump P and the gas solenoid valve GV2. However, when the lever is in "automatic" mode, the cock 6 is used to supply hot water.
When the microswitch Msw2 is activated by the operation of the water sensing actuator D2 of the hot water supply circuit 4, the normally closed contact of the microswitch Msw2 is activated, thereby closing the water crab solenoid valve WV and closing the normally open contact. . Therefore, at this time, the hot water is circulated and heated, and since the water solenoid valve WV is closed, the hot water does not flow through the heat exchanger 2, and the hot water can be heated effectively.
When hot water supply is stopped, use the micro switch Msw, 2.
As a result, the water solenoid valve WV becomes involved, and the automatic circulation heating of the hot water is restarted as described above. In addition, in the embodiment of the present invention, the O of the pump relay PR is
Since a load circuit 19 is provided so that the electric circuit is opened during the N time, that is, during circulation operation by the pump P, if this is a sterilization circuit as shown in the box example, the load circuit 19 can be placed at an appropriate position in the Yumoat circulation path 3. If it is interposed on the suction side or the discharge side of the pump P, in combination with a filter, it is possible to always obtain sanitary and clean hot water, allowing for a comfortable bathing experience.

Next, since the present invention enables Yuyuyu circulation heating to be switched between "forced" and "automatic", it is preferable to install an appropriate air introduction device in the bypass path (for example, simply by installing an air hole in the bypass path). The hole is opened and closed to create an odor.

), ultrasonic waves can be obtained as needed by operating the air introduction device by switching the Yuyuyu circulation to the "forced" side to utilize ultrasonic waves caused by the bursting of bubbles in the water. It is possible to obtain an inexpensive and easy-to-operate ultrasonic device as an integrated built-in device without purchasing an expensive ultrasonic generator as a separate device. In addition, in the device of the present invention, a changeover switch 13 is provided to selectively switch the bath temperature detection function of the thermistor sensor TS, that is, the detection activation function of the high temperature switch Tsw, between "forced" operation and "automatic" operation. Therefore, the operation of the high temperature switch due to "automatic" operation can be minimized as much as possible.

That is, since the thermistor sensor TS is installed in the circulation path 3 of Yuyuyu, the temperature difference between the sensor part and the inside of the bathtub is substantially small during the "forced" operation of constant circulation, and the "automatic" operation of intermittent circulation is substantially small. During "forced" operation, the temperature difference between the inside of the bathtub and the inside of the circulation path becomes large, especially when the circulation is stopped, so the ON/OFF operation will occur frequently with the same sensitivity as during "forced" operation. Therefore, in order to prevent this, it is necessary to turn on the sensor TS using a regulator (not shown) built into the Samister Ambient TA.
・The OFF operating range can be set larger than that for forced temp. For example, for a set water temperature of 4-0, the ON point for forced temp is set to minus 0.1 to 0.90, The ON point is set to -1 to 5 DEG C.Next, we will explain how to prevent freezing of the device of the present invention during inconvenient use in winter.

To conserve resources, bathtub water is not only used for bathing but also for washing, or if the bathtub is made of wood, it is generally stored until the next day to prevent water from leaking due to dry deformation. It is true.

However, in the case of a circulation method using a pump, if the circuit pipe is made of pongee pipe, the water in the circuit pipe may freeze during inconvenient use in winter, damaging the water circulation equipment, or in severe cases, the circuit may be damaged. Accidents such as rupture may occur. Therefore, in the present invention, freezing is prevented by using a low temperature detection function using a thermistor sensor TS. To explain this with reference to Fig. 1, the low temperature operation range of the thermistor sensor TS is set to, for example, 5°C to 10qo. The normal side of the switch is connected in parallel with the pump switch PSW, and when bathing is not needed, the pilot burner 9 mentioned above is left ignited and only the pump switch PSW is turned OFF.At this time, the circulation selector switch 14 is It does not matter whether the position is forced or automatic. Also, since the high temperature switch Tsw is turned off at the so-called bathing temperature of the bathhouse, it is always in the ON state when the temperature is lower than the bathing temperature, and therefore the relay R. The contact point r, is ○N branch. In this state, the bath temperature decreases to 5° C.29, and the low temperature switch Tsw2 is turned on. Then selector switch 1
Regardless of whether 4 is on the "forced" side or the "r automatic" side, the pump relay PR turns to N to start the pump P, and then the flowing water sensing actuator D activates the micro switch Msw,
is closed and the gas solenoid valve GV2 is opened, that is, circulating heating by the main burner 8 is started. When the temperature of the bath water rises to 10 qo due to heating, the low temperature switch Tsw2 turns OFF.
F, that is, the circulating heating is stopped, and the above operation is repeated upon detection of the low temperature switch Tsw2 to automatically prevent freezing. Incidentally, when the bathtub is inconvenient, it is sufficient to operate only the anti-freezing operation as the minimum operation, so the pilot burner 9 can also be extinguished and only the start-up operation can be performed by the pump P. The normally closed side of the low temperature switch Tsw2 may be provided in the circuit 19.

Next, as a fire safety device for the device of the present invention, an overheat prevention switch 15 is connected in series to the gas solenoid valve GV2 circuit of the main burner 8, which is attached to the heat exchanger 2 to prevent overheating due to dry heating, etc. Also, gas solenoid valve GV,
A thermal fuse 18 is connected in series to the circuit, which detects and activates when there is an aflation phenomenon caused by headwinds of the burner flame, etc.
Combustion in the main burner 8 is stopped during dry firing and overheating, and combustion in the main burner 8 and pilot burner 9 is stopped when the flame flares, thereby preventing fires caused by each.

In addition, regarding the gas solenoid valve, the supply to the pilot burner 9 is controlled by one solenoid valve CV, but in order to prevent unexpected accidents due to failure of the valve, a separate solenoid valve CV is installed in the pilot burner side pipe. A solenoid valve (not shown) may be interposed in the solenoid valve GV, and a connecting line may be connected to the electric circuit of the solenoid valve GV.
By doing so, even if the valve GV fails, pilot burner combustion can be stopped and damage to the vessel body can be prevented, resulting in double safety and improved reliability.

As described in detail above, according to the device of the present invention, it is possible to provide a heating control device having the following excellent effects in a forced circulation type hot water heating device with a one-can, two-path hot water supply device. .

(b) All control operations on the bath water side are electrically controlled, so all you have to do is select the switch for Yuuyu circulation and operate the pump switch by installing the device outside the bathroom and the controller inside the bathroom, and using remote control. When you turn on the main switch, it automatically heats up to the desired setting and maintains that temperature from then on, which is extremely convenient.

B. Since a thermistor sensor was used to detect the bath water temperature,
Accurate detection can be obtained and economical and efficient heating control can be performed.

C. On the bathing water side, we made it possible to switch between "forced" and "automatic" circulation, so we installed appropriate equipment in the circulation path, such as a filter, a sterilizer, and a health and beauty device that blows bubbles by introducing air. If attached, multi-functions can be obtained through "forced" constant circulation operation.

D. For heating control on the loose side, where there is a risk of dry heating, we have installed not only an overheating prevention switch but also a microswitch in the gas solenoid valve circuit that is controlled by the operation of a circulating water sensing actuator, which improves safety. Therefore, a superior control device can be obtained.

E. A bypass was installed in the bath water circulation path, and when hot water was being used, Yuyuu was circulated by bypass, giving priority to hot water supply.
Thermal efficiency of hot water supply does not decrease during water supply. He Bonfu.

Since activation can be performed by low temperature detection using a thermistor sensor, it is possible to prevent the circulation path from freezing in the winter. G. Since the heating and stopping of the bath water is automatically controlled, there are small changes in the temperature of the bath water, so it can be used comfortably at any time (it does not cool down like with a natural circulation type).

H. Since all the equipment can be integrated into the body, all that is needed to connect it to the bathtub is the construction of a circulation pipe, making it easy to replace the existing bathtub.

[Brief explanation of drawings]

FIG. 1 is an electric circuit diagram of a normally closed switching contact according to an embodiment of the present invention, and FIG. 2 is a schematic diagram of a circulation/hot water supply system. 1...Bathtub, 2...Heat exchanger, 3...
...Circulation path, 4...Moat supply circuit, 5...
Bypass path, 8...Main burner, 9...Pilot burner, 12...Main switch, 13...
...Choice switch, 14. ．． ．． ．． ．． ．． Changeover switch, P
...Pump, TS...Thermistor sensor, WV...Water solenoid valve, GV2...Gas solenoid valve, PR...Pump relay, MSw,, MSw2
...Micro switch, Tsw. ...High temperature detection activation switch, Ts pond...Anti-freeze temperature sensitive switch, R. ...Relay, r...Relay contact. Leopard 1 Figure 2

Claims (1)

[Claims] 1 Flowing water sensing actuator D_2 in parallel with the heat exchanger 2 on the hot water supply side
A hot water supply circuit equipped with a water supply circuit, a circulating water sensing actuator D_1 installed in parallel with the heat exchanger 2 on the bath side, a circulation pump P, a bypass passage 5 in which circulating water does not flow through the heat exchanger, and a water solenoid valve WV on the circulation route outgoing side. A one-can, two-system informal bathtub circulation system consisting of a bathtub circulation circuit that is sequentially provided from the upstream side of the bathtub and a thermistor sensor TS interposed on the circulation path side between the bathtub 1 and the bypass path 5. In a heating control device for a water heater that performs forced constant circulation and automatic intermittent circulation using a changeover switch 14, an antifreeze temperature-sensitive switch Tsw is installed in parallel with a pump switch Psw.
A pump starting circuit connects a pump relay PR and the changeover switch 14 in series to a circuit connected to _2 to start the pump P to circulate the bath, and responds to the differential pressure sensing of the flowing water sensing actuator D_1 on the bath side. The normally open contact of the micro switch MSw_1 that opens and closes by
_2 Micro switch Ms that opens and closes in response to differential pressure sensing
A burner circuit that opens and closes the gas solenoid valve GV_2 connected in series to the parallel circuit with the normally open contact of w_2 to turn on and extinguish the main burner 8, and the micro switch Ms on the hot water supply side.
A water solenoid valve circuit in which the normally closed contact of w_2 and the water solenoid valve WV are connected in series, and a relay R that is ON/OFF controlled by the high temperature detection activation switch Tsw_1 of the thermistor sensor TS.
The contact point of _1 connects r_1 to the circuit on one side of the changeover switch 14 and the micro switch Msw_1 on the bath water circulation side.
It has a temperature control relay circuit interposed in the normally open contact circuit of the hot water supply, and in addition to heating the hot water preferentially, the high temperature detection operation switch Tsw_1 turns on the burner circuit during forced constant circulation.
A heating control device that controls a burner circuit and a pump starting circuit respectively during automatic intermittent circulation.