JPS6123457B2 - - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a control circuit for a bath water circulation device in which bath water is forcibly circulated and heated by a pump.

An object of the present invention is to prevent heating in the circulation path, especially in the heat exchanger, from freezing when the bath is not in use in winter, in other words, when the power switch is turned off. The object of the present invention is to provide a control circuit that can automatically prevent accidents such as damage to road equipment. Another object of the present invention is to provide a control circuit for a hot water supply priority type bath water circulation system which is also equipped with a hot water supply device and is a one-can, two-path system, by adding only a small amount of circuitry.

Embodiments of the present invention will be described in detail below based on the drawings.

FIG. 1 schematically illustrates the system configuration of a bath water circulation system having a control circuit according to the present invention, in which a bath bath 1 and a heat exchanger 2 form a closed circuit, and a bath water circulation path 3 is formed.
It consists of P is a pump installed on the heat exchanger going side of the bath water circulation path 3, and THS is a hot water temperature sensing element such as a thermistor sensor installed on the heat exchanger going side to detect the temperature of circulating water from the bathtub 1. be. The circulation path is therefore provided with a flow sensor D ₁ connected in parallel with the heat exchanger 2 . The sensor operates by sensing the circulation of bath water in the circulation path 3, and controls on/off the circulation switch MSW ₁ , which will be described later. There is. Reference numeral 7 denotes a fuel pipe whose one end is connected to a fuel source, and whose tip is branched, one end being connected to a main burner 8 and the other end being connected to a pilot burner 9, and a pilot burner that controls fuel supply to each burner. A solenoid valve GV ₁ for the main burner and a solenoid valve CV ₂ for the main burner are installed.

Next, the electric control circuit will be explained with reference to FIG.

10 is a commercial power supply, F is a fuse, and 11 is a step-down transformer, and a rectifier RF is connected to the secondary side of the transformer where the voltage is stepped down so that direct current can be obtained. Further, a pump P is connected to the primary side of the transformer and a commercial power supply circuit via a contact Pr of a pump relay PR, which will be described later. THA is a temperature regulator connected to the DC power supply circuit from the rectifier RF, and THS is a circulating water temperature sensing element provided in the bath water circulation path 3.
TH _SW1 is a high temperature sensing switch that turns on and off at the set bathing temperature, and its activation signal is sent from the temperature controller.
It is made to be obtained from the output from THA. Reference numeral 12 denotes a changeover switch for changing the on/off operating point of the switch TH _SW1 , in other words, the detection sensitivity of the circulating water temperature. That is, in the embodiment of the present invention, as will be described later, there is a forced constant circulation operation in which the pump P always circulates the circulation regardless of burner heating, and a forced constant circulation operation in which the pump P is connected to the burner heating so that the burner is also burned during circulation. The system is designed to switch between automatic intermittent circulation operation when circulation and heating are stopped at the set temperature, but the water temperature detection element
Since it is installed in the THS and circulation path 3, the temperature difference in the circulation path becomes large, especially during circulation during "auto" operation and when it is _stopped .・Offs will occur frequently. Therefore, to prevent this, "automatic"
Sometimes, the temperature setting circuit built into the temperature controller THA is set higher than that when it is set to "forced" (for example, for a set water temperature of 40℃, the ON point when set to "forced" is -0.1 to 0.5℃) (In the "automatic" mode, the temperature is -1 to 5 degrees Celsius.), and the circuit can be switched. Therefore, if the circulation operation has only one function, either "forced" or "automatic", the above-mentioned changeover switch 0.2 is unnecessary.

TH _SW2 is set appropriately in the low temperature range (for example, 1°C to 5°C).
It is a low temperature sensing switch that turns on and off at temperatures (°C), and its activation signal is obtained from the output from the temperature regulator THA. Therefore, low temperature detection is also performed using the hot water temperature sensing element THS. _R1 is a temperature control relay connected in series to the high temperature sensing switch TH _SW1 . 13 is an operation changeover switch that selectively switches the bath water circulation between the aforementioned "forced" and "automatic" modes, and a pump relay PR is connected to the fixed terminal side of the switch.
and the movable terminal side is the low temperature sensing switch TH _SW2.
Connected to the power supply circuit via. GV ₂ is a solenoid valve for the main burner, and a circulation switch M is included in the valve circuit.
The contact M _SW1 of _SW1 is connected to the overheat prevention switch 14 that detects overheating such as dry firing of the heat exchanger 2, and the contact R ₂₁ of the discharge ignition drive relay R ₂ (described later), and is further connected to the pilot burner combustion confirmation relay R ₃ . It is connected to the circuit of the starting confirmation lamp PL ₁ and its switching contact r ₃₁ so that it can be switched when required. R ₁ is the contact point of the temperature control relay R ₁ , which connects the "auto" side circuit of the operation selector switch and the main burner solenoid valve.
It is interposed in the CV ₂ circuit. The IG _SW is an automatic return type ignition switch, and the movable contact of the relay contact _R31 is connected to the return close side terminal, the pilot burner ignition circuit described below is connected to the return open side terminal, and the movable terminal side is connected to the power switch. Connected to the power circuit via SW. P _SW is a pump start switch, which is connected in series to the pump relay PR circuit, in parallel to the low temperature sensing switch TH _SW2 , and connected to the power supply circuit via the power switch SW. R ₂ is a discharge ignition drive relay, R ₂₂ is a contact for the self-holding circuit of the relay, and GV ₁ is a solenoid valve for the pilot burner, and in terms of installation structure, it also functions as a main valve for the solenoid valve GV ₂ for the main burner. I'm letting you do it. 15 is the solenoid valve
The temperature fuse is connected in series to the GV ₁ circuit, and is designed to blow out in the event of a flare accident caused by headwinds of the burner flame, etc. IGT is an ignition transformer that supplies discharge energy to a discharge electrode (not shown) during ignition operation.
The IGA is a flame detector with built-in input/output circuits for the thermocouple TC, pilot burner combustion confirmation relay _R3 , and pilot burner confirmation lamp _PL2 . The contact point of this pilot burner combustion confirmation relay _R3 is connected to the return close side terminal _of the above-mentioned ignition switch IG _SW , and _R32 is connected to the power switch SW side circuit of the ignition transformer IGT. When the pilot burner burns, the ignition transformer circuit is opened, while the self-holding circuit of the relay _R2 is closed to keep it driven.

Next, the operation of the control circuit as described above will be explained.

FIG. 2 shows a state in which all operations are stopped with the operation changeover switch 13 for bath water circulation still switched to the "forced" side. First, we will explain the forced constant circulation operation.

When the bathtub 1 is filled with water and the power supply 10 is connected,
The hot water temperature sensing element THS is activated immediately and when the water temperature in the circulation path is lower than the set temperature, the high temperature sensing switch is activated.
When TH _SW1 turns on, relay _R1 operates and turns on its relay contact _r1 . The above operation is performed automatically by simply connecting the power source 10 without any switch operation or the like.

Then, when the power switch SW is turned on next, the start confirmation lamp PL ₁ lights up, so after confirming that it is lit, press the ignition switch IG _SW . Then, the pilot burner solenoid valve _GV1 is activated, and at the same time as fuel is ejected from the pilot burner 9, a discharge electrode (not shown) is discharged by the ignition transformer IGT, causing the burner to ignite and burn. When the burner burns, the thermocouple TC is heated and the flame detector IGA activates the pilot burner combustion confirmation relay _R3.
is activated and switches its contacts r ₃₁ and r ₃₂ to turn off the circuit of the ignition transformer IGT and stop the discharge. When the ignition switch IG _SW is pressed, the start confirmation lamp PL ₁ goes out, and the flame detector due to pilot burner combustion is activated.
Pilot burner combustion confirmation lamp when IGA is activated
PL ₂ lights up. After confirming that the lamp PL ₂ is on, the pressure on the ignition switch IG _SW is released, but the pilot burner solenoid valve GV ₁ circuit is activated by the operation of the ignition switch IG _SW to release the discharge ignition drive relay R ₂ .
Contacts _r21 and _r22 are on, and the switch operation will be released after contact _r32 of pilot burner combustion confirmation relay _R3 switches, so the fuel passage can be opened without opening the electric circuit. will be maintained. After the pressure on the ignition switch IG _SW is released, the main burner solenoid valve GV ₂ side circuit is opened by switching the relay contact _R31 , but the contact M _SW1 of the circulation switch M _SW1 remains off. Therefore, the valve is never turned on.

After this, when the pump start switch P _SW is turned on, the pump relay PR circuit is closed.
When the relay contact r is turned on, the pump P starts to start circulating the bath water. This circulation activates the bath water flow sensor D ₁ and turns on the circulation switch M _SW1 , that is, turns on the contact M _SW1 , which turns on the main burner solenoid valve GV ₂ and supplies fuel to the main burner 8. A passage is opened, and the burner is ignited by the pilot burner 9 to combust and heat the bath water to raise its temperature. When the temperature of the bath water rises to the set temperature (near the bathing temperature), the hot water temperature detection element THS turns off the high temperature sensing switch TH _SW1 , so contact r ₁ of relay R ₁ also turns off, and the main burner electromagnetic Valve GV ₂
The solenoid valve stops the flow of fuel to the burner, ie combustion heating stops.
At this time, the pump start switch P _SW remains on and the operation selector switch 13 is set to the "forced" side, so the pump P is still operating due to the pump relay PR and the bath water is circulating. become. When the hot water temperature drops below the set value after the burner heating stops, the hot water temperature sensing element THS turns on the high temperature sensing switch TH _SW1 , and the relay
Contact _R1 of R1 turns on and _the main burner solenoid valve
Since the GV ₂ is activated, the burner 8 starts combustion again and heats the bath water. As described above, when the circulation operation changeover switch 13 is set to the "forced" side, the solenoid valve GV 2 is turned on and off by turning on and off the contact _r1 of the relay R1 by turning on and off _the high temperature sensing switch TH _{SW1 .} Since the opening/closing of the burner 8 is simply controlled and the combustion of the burner 8 is controlled, the bath water is constantly being circulated as long as the pump start switch _PSW is turned on.

Next, automatic intermittent 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, if you switch the operation selector switch 13 to the "auto" side and turn on the pump start switch P _SW , if the water temperature is detected by the hot water temperature sensing element THS and the bath water is lower than the set temperature, the high temperature sensing switch TH _SW1 will be turned on. Since this turns on contact _r1 of relay _R1 , pump P is started by pump relay PR. Since the bath water is circulated by starting the pump, the flow sensor _D1 is activated and turns on the contact _MSW1 of the circulation switch _MSW1 .
The main burner solenoid valve GV ₂ is turned on and the corresponding burner 8 is turned on.
The burner 8 starts combustion.
In this way, when the post-bath water reaches the set temperature, the high temperature sensing switch TH _SW1 is turned off by the detection of the hot water temperature sensing element THS, the contact _r1 of relay _R1 is turned off, and the contact Pr of the pump relay PR is turned off, which turns off the pump P. At the same time as the circulation is stopped, the electric circuit of the electromagnetic valve GV ₂ is also opened, so that burner combustion is also stopped. After heating and circulation are stopped, when the hot water temperature at the detection section of the hot water temperature sensing element THS falls to a predetermined temperature, the high temperature sensing switch TH _SW1 is turned on, and the pump is started again and burner combustion is started as described above. As described above, when the circulation operation selector switch ₁₃ is switched to _the "auto" side, the pump _P and main burner The temperature of the bath water is adjusted by controlling the opening and closing of the solenoid valve GV ₂ .

In this way, in the embodiments of the present invention, there are two types of bath water circulation: "forced" and "automatic", but as is clear from the explanation so far, if you just boil the bath water and maintain it at a constant temperature, For example, only one function, ``forced'' or ``automatic,'' is sufficient, and this is not the point of this invention. As an example, the intention of providing two functions in this way is that if, for example, a filter is inserted in the circulation path 3 and the operation is "forced" during bathing, the filtered bath water will always circulate and flow into the bathtub 1. Since the water is supplied to the bather, it is easy for the bather to feel comfortable in the bath. Therefore, when no one is taking a bath, you can switch to the "automatic" side to save electricity such as the pump's electricity consumption.

Next, antifreeze control of the circuit of the present invention will be explained.

In the case of a circulation method using a pump, the circulation pipe can be thinner than that of a so-called natural circulation bath kettle.
It is also actually used. Therefore, if a heat source (vessel) is installed outdoors and the piping is installed in a circulation path using thin tubes, the water in the circuit tube may freeze when not in use in winter, damaging various equipment or equipment. Accidents may occur, such as pipes bursting. Therefore, when there is a risk that the outside temperature will drop to freezing temperatures, the most basic countermeasure is to drain the water in the circuit in advance, but bath water is a resource-saving solution. From my perspective, I don't use it only for bathing, I leave it for washing,
Alternatively, if the bathtub is made of wood, it is common to store it in a reservoir to prevent it from deforming due to drying. Therefore, in order to optimally and automatically prevent freezing even when the bath water is stored, a low temperature sensor is used to start the pump, and a burner can also be used to raise the temperature slightly. It is possible to do so. However, these electrical controls are difficult to control, considering that household electrical control devices are generally equipped with a power switch, also known as a main switch, between the power outlet and the power outlet.
It is assumed that the power switch is always turned on. During normal use of general electrical appliances, the current circuit is not turned on or off at the power outlet, but the power switch is operated exclusively to check whether the appliance is in use or not. However, in the bathwater circulation system according to the present invention, if the switch must be left on when the water freezes, it is extremely inconvenient from the user's perspective of ease of use. Therefore, in the present invention, the pump starting circuit using the low temperature sensing switch TH _SW2 is constructed so as not to be interfered with by the power switch SW as described above, thereby making it extremely easy to use. Therefore, to explain this with a diagram, the power supply 10 is kept connected and the power switch SW is turned off when not in use. Although the pump start switch P _SW does not affect the anti-freezing effect whether it is turned on or off, it is preferably turned off. Even if the power switch SW is off, a predetermined voltage is applied to the temperature regulator THA, so the water temperature detection element
THS detects the water temperature and turns on the high temperature sensing switch.
Since TH _SW1 turns off near the bathing water temperature, it naturally turns on when the temperature is lower than that, and the relay
Contact r ₁ of R ₁ is also turned on. It should be noted here that the activation signal to the low temperature sensing switch TH _SW2 in the embodiment of the present invention is obtained by sensing the low temperature of the hot water temperature sensing element THS and from the output of the temperature regulator THA. Of course, it may be provided independently to detect the outside air temperature or the hot water temperature for low temperature. In such a situation,
The temperature of the bath water in the circulation path gradually decreases, and when it reaches the operating temperature of the temperature sensing switch TH _SW2 (for example, 1°C), a signal is output from the temperature controller THA upon detection by the hot water temperature sensing element THS, and the low temperature is detected. Turn on the detection switch. Then, since the contact _r1 of the relay _R1 is already in the on state, the electric circuit of the pump relay PR is closed even if the operation selector switch 13 is set to either "forced" or "automatic". Therefore, the relay contact Pr is turned on and the pump P starts to circulate the bath water.
Due to this circulation, the bath water has a larger amount of heat in the bathtub 1 than in the circulation path 3, so the temperature in the circulation path increases. When this temperature reaches a predetermined temperature (for example, 5℃), the low temperature sensing switch TH _SW2 is turned off by detection by the hot water temperature sensing element THS.
That is, the operation of the pump P is stopped. The above-mentioned action is repeated as the bath water temperature changes. When the temperature in the bathtub 1 drops to the anti-freeze activation temperature, the low temperature sensing switch TH _SW2 is always on and the pump P controls the bath water (bath water). Circulation will continue to operate.

In this way, even if the power switch SW is turned off, if the power supply 10 is connected, the anti-freeze circuit will automatically operate in the winter, so the user should get used to it when the equipment is not in use. It does not interfere with the operation of the power switch off, and it is easy to use as it feels like any other equipment.

Next, a case will be described in which a hot water supply device is attached to the present invention.

FIG. 3 shows a system in which a water solenoid valve WV is interposed in the bath water circulation path 3 shown in FIG. This allows for simple circulation without passing through the heat exchanger 2a, that is, without being heated. Further, the heat exchanger 2a is of a one-can two-path type, and one heat exchanger is used for the bath water side and the other side for the hot water supply side. D ₂ is a hot water sensor provided in the hot water supply circuit Δ, which operates the hot water supply switch M _SW2 in response to hot water supply operation using the faucet 6 . To explain this using the electrical circuit shown in Figure 4, the circuit of the water solenoid valve WV and the normally closed contact M _SW21 of the hot water supply switch M _SW2 are connected in series to the power supply circuit via the low temperature sensing switch TH _SW2 . Furthermore, the normally open side contact _MSW22 of the hot water supply switch _MSW2 is connected in parallel with the series circuit of the contact MSW1 of the bath water circulation switch _MSW1 and _the contact _r1 of the relay _R1 .

In the above configuration, when the faucet 6 is opened during bath water circulation operation by the pump, the hot water sensor D ₂
The hot water supply switch M _SW2 is activated, its normally closed contact M _SW21 is turned off, and the water solenoid valve WV shuts off the circulation path 3, and the normally open contact M _SW 22 is turned on, which turns off the main burner solenoid. Close the circuit of valve GV ₂ . Therefore, when the bathtub is being heated, the circulation sensing of the flow sensor _D1 disappears due to the shutoff of the water solenoid valve WV, so the contact _MSW1 of the circulation switch _MSW1 is turned off and the circuit of the solenoid valve _GV2 is opened. However, the valve circuit has a circulation switch contact _MSW.
1 and the hot water supply switch normally open contact M _SW22 are connected in series, the main burner 8 can ignite and burn. When hot water supply is stopped, the water solenoid valve WV circuit closes, contrary to the above, and the circulation switch contact M _SW1 is also turned on, restarting circulation heating.

In this way, in terms of the circuit configuration, by simply adding a few configurations to the bath water side control circuit shown in Figure 2, it is possible to obtain a control circuit for a circulation/water supply device that is a single-can, two-path system and prioritizes hot water supply. It can be done.

Next, regarding the function and effect of the bypass passage 5, in addition to the above-mentioned function of bypassing the circulation side during hot water supply operation when the bypass passage is equipped with a one-can two-path water heater, If the device is manufactured, a simple and economical bubble-using health device can be obtained.

As described above, the embodiments of the present invention have been described in detail.According to the present invention, as long as the power supply voltage is applied to the circuit device, even if the power switch is in the OFF state, the bath water temperature will reach the low temperature sensing set temperature. When the water level drops to 100, the sensor switch is turned on to automatically start the pump and circulate the bath water to prevent freezing in the circulation path due to stagnant water. Therefore, users are not discouraged from the habit of turning off the power switch when not using electrical equipment, so there is no need to take special precautions to prevent freezing, and other equipment The power switch can be operated in the same way as a device, and an easy-to-use control circuit can be provided.

Further, since the antifreeze function is operated independently and automatically by the above-mentioned circuit, the safety of the entire apparatus is further improved in combination with the safety means of cyclic heating control.

Furthermore, according to the present invention, in terms of control circuit configuration, it is possible to obtain a hot water supply priority type device equipped with a single-can two-path type hot water supply mechanism by simply adding a few circuits to the circuit of the present invention. .

[Brief explanation of the drawing]

FIG. 1 is a schematic configuration diagram of a device according to an embodiment of the present invention, FIG. 2 is a control circuit diagram thereof, FIG. 3 is a schematic configuration diagram of a device according to another embodiment of the present invention, and FIG. 4 is its control circuit diagram. It is a control circuit diagram. 1... Bathtub, 2... Heat exchanger, 2a... One-can two-path heat exchanger, 3... Bath water circulation path, 4... Hot water supply circuit, 5... Bypass path, 8... Main burner, 9
...Pilot burner, M _SW1 ...Circulation switch, M _SW1 ...Circulation switch contact, M _SW2 ...Hot water switch, M _SW21 /M _SW22 ...Hot water switch contact, WV...Water solenoid valve, PR...Pump relay ,
THS...Hot water temperature sensing element, TH _SW ...High temperature sensing switch, TH _SW2 ...Low temperature sensing switch, P _SW ...Pump start switch, SW...Power switch, GV ₁
... Solenoid valve for pilot burner, GV ₂ ... Solenoid valve for pilot burner.

Claims (1)

[Claims] 1. In the electric control circuit of the bath water circulation device, which has a pump interposed in the bath water circulation path between the bathtub and the heat exchanger, there is a circuit that has a high temperature sensing switch that turns on and off depending on the set bath temperature, and a temperature control relay. , a circuit having a low temperature sensing switch and a pump relay, a circuit having a contact point of a power switch and the temperature control relay, a bath water circulation sensing switch, and a main burner solenoid valve, and these circuits are connected in parallel to form a power supply circuit. 1. A control circuit for a bath water circulation device, characterized in that the negative side between the low temperature sensing switch and the power switch is connected via a pump switch that controls the operation of the pump relay.