JPS627461B2 - - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a heating device for circulating bath water in a bath device, which includes a circulation pump interposed in a circulation circuit for a bathtub and a water heater heat exchanger. One of the objects of the present invention is to make it possible to maintain the temperature of a bath at all times within a comfortable range, in view of the fact that a difference of just a few degrees in the water temperature can make a noticeable difference in the pleasure of the bather. It is in. Another object of the present invention is to prevent waste of fuel costs due to overheating of the bath water and to enable economical use of the bath water. Still another object of the present invention is to automate the complicated burner ignition and extinguishing operations for controlling the bath water temperature. Still another object of the present invention is to provide households with an inexpensive bath water circulation and heating device that enables resource-saving use of bath water.

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

In FIG. 1, 1 is a bathtub, 2 is a heat exchanger for heating water, and a pump P is interposed therebetween to form a bath water circulation path 3. 4 is a main burner that heats the heat exchanger 2, and 5 is a pilot burner branched from the middle of a gas circuit 6 leading to the main burner. 7 is the fuel gas supply to the main burner.
It is a gas valve that controls ON/OFF. 8 is a high-pressure side conduit 8 that transfers the differential pressure between the flowing water pressure in the circuit near the pump P discharge side of the circulation path 3 and the flowing water pressure between the heat exchanger 2 and the bathtub 1.
This is a differential pressure sensing and actuating device that senses and operates via the low-pressure side conduit 8b and the gas valve 7, and the device and the gas valve 7 are connected to each other via a connecting rod 9 so as to operate in conjunction with each other. That is, when bath water is circulating in the circulation path 3, the differential pressure sensing actuator 8 operates to open the gas valve 7 through the connecting rod 9. V is a solenoid valve interposed between the pump in the circulation path 3 and the high pressure side conduit 8a of the differential pressure sensing actuation device 8, and 10 is a solenoid valve branched from the circulation path between the solenoid valve and the pump P to a heat exchanger. This is a bypass path that allows the bath to flow directly to the bathtub without going through the bathtub. TS is a thermistor sensor that is provided between the bypass connection part of the feed side path of the heat exchanger 2 and the bathtub 1, and detects the temperature of hot water in the circulation path.

Figure 2 shows the electrical control circuit of the device of the present invention, in which a thermistor amplifier TA, a circulation pump relay switch PR, and a solenoid valve switch VS are connected in parallel between the power supplies, and the thermistor amplifier TA is forced to operate in constant circulation mode. Two branch contacts 11 and 1 that allow individual settings for water temperature and automatic continuous circulation operation.
1, and two switching contacts 1 are provided in the pump relay switch PR and solenoid valve switch VS circuits, respectively.
2a, 12b, 13a, and 13b are provided, and these contacts can be switched by interlocking movable contacts a, b, and c that switch between the constant circulation and the on/off circulation. The arrangement relationship between the contacts 12a, 12b, 13a, 13b and the movable contacts b, c is such that when the forced operation is performed, the contact 12a, 12b, 13a, 13b is
a and movable contact b, contact 13a and movable contact c, and during automatic operation, contact 13b, movable contact b, and contact 1
2b and the movable contact c are connected.
In addition, by interposing a thermistor switch T on one side of the above movable contact circuit, it is possible to selectively switch the pump operation ON and OFF during automatic operation, and to open and close the solenoid valve during forced operation. I have to.

In such a configuration, its operation will be explained next.

In the present invention, as mentioned above, bath water circulation can be performed in forced operation or automatic operation. First, let's talk about forced operation. As shown in FIG. 2, movable contacts a, b, and c are ” side, the pump relay switch PR is turned on, the circulation pump P is activated, and the bath water is sucked and sent out from the bathtub 1.
The temperature of the bath water sent out from this circulation pump is detected by a thermistor sensor TS, and if the temperature is lower than the set temperature, the thermistor switch T is turned on, the solenoid valve switch VS is turned on, and the bath water circulation path is opened. When the bath water starts to flow in the circulation path 3, the differential pressure sensing actuator 8 activates the high pressure side conduit 8a.
The differential pressure is sensed by the low pressure side conduit 8b, and the internal differential pressure displacement body is displaced to the right in the figure. Then, the gas valve 7 connected to the connecting rod 9 for interlocking displacement opens so as to supply and send out the fuel gas from the gas circuit 6 to the main burner 4. Therefore, if the pilot burner 5 is ignited in advance, the main burner 4 will ignite and burn to heat the heat exchanger 2, and thus hot water will be supplied to the bathtub 1. When the bath water rises to the set temperature, the thermistor switch T is turned off by the detection by the thermistor sensor TS, and the solenoid valve V is closed. When the electromagnetic valve closes, the bath water does not circulate in the circulation path 3 beyond it, so the differential pressure of the differential pressure sensing actuator 8 also disappears, and the gas valve 7 is closed, that is, the main burner 4 is closed. Stop combustion. On the other hand, since the pump P is still operating, the bath water sent from the pump will be sent to the bathtub from the bypass path 10. Therefore, in the case of forced operation, pump P
is always in operation, and when the thermistor sensor TS detects the water temperature, the switch T is turned on and off to control the opening and closing of the solenoid valve V, repeating heating circulation and bypass circulation to maintain the bath water temperature constant. ing.

Next, regarding automatic operation, movable contacts a, b, c
When connected to the “auto” side, the solenoid valve switch
VS turns on and solenoid valve V opens. The pump relay switch PR is a circuit connected in series with the thermistor switch T, so when the water temperature is lower than the set temperature, the switch T is turned on when the thermistor sensor TS detects it, and the pump relay switch PR is also turned on.
When turned on, the pump P starts, and thus the bath water flows through the circulation path 3, and the main burner 4 is ignited and burned by the operation of the differential pressure sensing actuation device 8, as in the case of forced operation described above. When the water temperature reaches the set temperature, the thermistor switch T turns OFF, stopping the pump operation and eventually stopping the main burner combustion. Therefore, in the case of automatic operation, the bath water temperature is maintained constant by repeating circulation stop and heating circulation by turning the pump P ON and OFF.

In addition, in the case of the present invention, the heating control of the bath water is "automatic".
and "forced", and since the hot water temperature is detected not in the bathtub but in the circulation path, there will be a difference between the temperature in the bathtub and the temperature in the circulation path between forced operation and automatic operation. Therefore, in this case, in order to keep the temperature inside the bathtub constant in any operation, the temperature difference between the ON point and OFF point of each of the temperatures detected by the thermistor sensor TS is changed, and the temperature difference is changed to a variable method, so that the temperature inside the bathtub is constant during any operation. It may be possible to set the value larger during operation. By doing so, it is possible to prevent a difference in bath water temperature from occurring when switching between "forced" and "automatic" modes, and it is also possible to measure the accuracy of water temperature control. Furthermore, in the case of the present invention, in addition to automatic operation, the bath water heating device can be constantly circulated by forced operation, so that a multi-functional bath water heating device can be easily created by simply adding various equipment. Obtainable. For example, if a filtration filter is interposed in the bath water circulation path in the forced operation, the filtration work can be carried out in a very short time because the circulation is constant, unlike the intermittent circulation in the automatic operation.
Furthermore, if an air introduction device is interposed in the bypass path 10, it can also be used as a health device that utilizes air bubbles. That is, if a suitable air introducing device is inserted so as to mix air into the circulation path when desired and generate countless air bubbles when ejected into the bathtub, it is possible to create a health and beauty promoting device that utilizes the ultrasonic waves generated from air bubbles. It can be used as a.

As described above, the present invention provides a system in which a circulation pump is interposed in a bath water circulation circuit for a bathtub and a heat exchanger, and a thermistor sensor for detecting the temperature of the water is provided in the circulation path. When it is ON, the solenoid valve installed in the circulation path is opened, allowing circulation and heating by the heat exchanger. When it is OFF, the valve is closed, allowing bypass circulation without going through the heat exchanger and heating operation. Two types of operation: forced continuous circulation operation in which the circuit is stopped, and automatic intermittent circulation operation in which the solenoid valve is always open and the pump operates to circulate and heat when the circuit is ON, and stops circulation and heating when it is OFF. Has a function,
On the other hand, this heating circuit uses a differential pressure sensing actuator that detects the pressure difference generated by the circulation of bath water in the circulation path and operates the displacement, and controls the opening and closing of the gas valve in the gas circuit, so all you need to do is operate the power switch for the first time. In addition to automatically heating up to the set water temperature and stopping operations, operations to maintain the water temperature such as reheating can also be performed automatically, and together with the accurate operation of the thermistor sensor, an economical bath water heating device is obtained. be able to. Furthermore, since the apparatus of the present invention can be operated in circulation at all times by switching a switch, a more excellent bath water heating and circulation apparatus can be obtained by attaching equipment that utilizes circulation, such as a filter, to the circuit. Furthermore, the supply of fuel gas to the burner is controlled by opening and closing the gas valve by generating a pressure difference within the circuit due to the circulating action of the bath water circulation path, so that it is reliable without unnecessary heating operations in addition to the automatic control described above. A device with excellent performance can be obtained. In addition, since the heating is controlled by detecting the temperature of the hot water, the water does not get cold, the fuel cost for reheating is low, and a comfortable temperature can be maintained.

[Brief explanation of the drawing]

FIG. 1 is a configuration diagram of a bath water circulation circuit according to the present invention,
FIG. 2 shows the electrical circuit of the circulation circuit. DESCRIPTION OF SYMBOLS 1... Bathtub, 2... Heat exchanger, 3... Bath water circulation path, 4... Main burner, 8... Differential pressure sensing actuation device, 10... Bypass path, P... Pump, PR...
…Pump relay, TS…Thermistor sensor, T
...Thermistor switch, V... Solenoid valve, VS...
...Solenoid valve switch.

Claims (1)

[Claims] 1. In the bath water circulation path 3 that circulates bath water between the bathtub 1 and the heat exchanger 2, a pump P is interposed in the supply side path to the heat exchanger 2, and the path between the pump P and the heat exchanger 2 is A bypass passage 10 from the bathtub 1 is provided between the bathtub 1 and the bypass passage connection part of the feed side passage to the heat exchanger 2, and a thermistor sensor TS is provided between the bypass passage connection part and the bypass passage connection part. There is a solenoid valve V between the path of the vessel 2.
A differential pressure sensing actuating device 8 is connected between the inlet and outlet passages of the heat exchanger 2, and the actuating device 8 controls the opening and closing of the gas valve 7 in the middle of the gas supply pipe to the burner of the heat exchanger 2. In addition, the electric control circuit for the pump P and the solenoid valve V is provided with two branch contacts for each of the pump relay switch PR and the solenoid valve switch VS, and an interlocking movable contact that is switched and connected to each of these contacts. A thermistor switch T is interposed on one side of the circuit of the contact, so that the thermistor switch T can selectively switch the opening/closing of the solenoid valve control operation or the ON/OFF of the pump control operation. Bath water circulation heating device.