JPH028227B2 - - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION Field of Industrial Application The present invention relates to a heating device for hot water supply, instant heating, etc.

Configuration and problems of conventional examples Conventional hot water heating devices used sheathed heaters as heating elements. In addition, it solves the problem of insufficient input during instantaneous heating and provides sufficient hot water supply capacity.If you want to control the temperature of the hot water that comes out, you can use it in addition to a storage type water heater with an internal heater. The method used was to separately install an instantaneous heat exchanger with an internal heater. In the above conventional example, a hot water storage room water heater, an instantaneous heat exchanger, and two water heaters were required. Therefore, the installation space is large and the cost is high. In addition, the sheathed heater has a high heat transfer resistance from the heating wire to the water contact surface, and the heating rate does not follow sudden changes in the inflow water temperature, making it difficult to always maintain a constant water temperature.

OBJECTS OF THE INVENTION The present invention aims to solve such conventional problems and achieve compactness.

Structure of the Invention The present invention provides a bypass path that branches from an outflow path of a heating section consisting of a heating element and a hot water storage chamber and communicates with the suction port side of a reversible water pump. The structure is equipped with an opening/closing means in the channel, and when supplying hot water, the reversible water pump is operated in forward rotation.
When heating the stored hot water, the system operates in reverse to adjust the temperature of the hot water, making it possible to supply hot water with minimal changes in the hot water temperature.

DESCRIPTION OF EMBODIMENTS Examples of the present invention will be described below with reference to FIGS. 1 to 6.

In FIG. 1, reference numeral 1 denotes a heating hot water storage section, which has a configuration in which an instantaneous heat exchanger 4 consisting of a heating element 2 and a heating passage 3 around it is installed inside a hot water storage chamber 5. The heating element 2 uses a ceramic heater that has high thermal conductivity and is capable of high wattage density input. The heated hot water storage section 1 includes a water supply channel 8 in which a check valve 6 and a reversible water pump 7 are provided.
and an outflow passage 10 in which a passage opening/closing means 9 is disposed. A bypass passage 11 is formed from the outflow passage 10 toward the suction side of the reversible water pump 7, and the bypass passage 11 is provided with a check valve 12 that directs the outflow passage in the forward direction.
has been inserted. The inlet of the water supply channel 8 is connected to the cistern 13, and the outlet end of the outlet channel 10 is connected to the outflow nozzle 14.
is connected to. Reference numeral 15 denotes a control section, which is connected to a hot water storage room hot water temperature sensor 16, a hot water outlet temperature sensor 17, a heating element 2, a reversible water pump 7, and a channel opening/closing means 9. 18 is a driving operation knob, and 19 is a hot water temperature adjustment knob.

FIG. 2 shows a control circuit, in which 20 is a reversible water pump motor, 21 is a changeover switch for operation control knob 18, and 22 is a variable resistor for hot water temperature adjustment knob 19.

FIG. 3 shows a sectional view of the heated hot water storage section 1, in which 23 is a water supply port communicating with the water supply channel 8, and 24 is an outlet communicating with the outlet channel 10.

Figures 4 and 5 show the 20 rotations of the motor and the flow direction during operation. Figure 4 shows the hot water storage chamber 5 of the heating hot water storage section 1.
FIG. 5 shows the state when the water is heated, and FIG. 5 shows the state when the hot water is supplied.

FIG. 6 shows the hot water temperature control characteristics of the hot water heating device.
T _W indicates the inflow water temperature, T _S indicates the hot water storage room water temperature, and T _O indicates the outlet water temperature.

In the above configuration, when the operation control knob 18 is set to heat the stored hot water temperature, the changeover switch 21 turns off the channel opening/closing means 9, and the motor 2 of the reversible water pump 7 is turned off.
Turn 0 clockwise R _CW . The flow of water is as shown in Figure 4, with a reversible water pump 7 and a bypass path 1.
1. Circulating flow of heating hot water storage section 1 and reversible water pump 7
It becomes _F1 . At this time, the heating element 2 of the instantaneous heat exchanger 4
is energized and the water is heated. When the water temperature reaches the set temperature of the hot water storage room hot water temperature sensor 16, the heating element 2
energization is stopped, and the reversible water pump 7 is also stopped due to the activation of the relay. The water temperature in the hot water storage chamber 5 is maintained at the set temperature _TSO in Figure 6.

Next, when the operation control knob 18 is set to the hot water supply side, the changeover switch 21 turns on the flow path inspection means 9 and turns the motor 20 of the reversible water pump 7 counterclockwise R _CCW.
Make it. As shown in Fig. 5, the flow of water is as follows: cistern 13, reversible water pump 7, heating hot water storage section 1,
The flow is from the outflow path 10 to the outside of the vessel as indicated by arrow _F2 .
At this time, the heating element 2 of the instantaneous heat exchanger 4 is set to the hot water temperature set by the hot water temperature adjustment knob 19.
In response to the signal from the outlet hot water temperature sensor 17, electrical heating is performed. As a result, the temperature of the hot water supplied from the hot water heating device is as shown in Figure 6, the set temperature of the hot water storage chamber T _SO
The outlet hot water temperature T _O is increased by the control value ΔT from .
The control value ΔT can be adjusted in the range from zero to the maximum input value of the heating element 2, depending on the purpose of use.

An example in which the hot water heating device described above is applied to a toilet seat can be considered as an effective application example. in this case,
Hot water storage chamber set temperature _TOS is 35℃, control value ΔT is 0 to 7
By setting the temperature to ℃, the hot water temperature _TO is 35℃~42℃
Adjustments can be made within the range of

Effects of the Invention As described above, since hot water supply and stored hot water heating using a reversible water pump involve forced convection heat exchange, the heat exchange efficiency (heat transfer coefficient) becomes extremely high. As a result, the temperature of the heating element surface decreases, scale adhesion to the heating element surface can be suppressed, and the heating element can be made smaller. Furthermore, by rotating the water pump in the forward and reverse directions, a two-way valve can be used as the channel opening/closing means, which simplifies the channel configuration and reduces costs. Furthermore, since the instantaneous heat exchanger is installed inside the hot water storage chamber, there are fewer piping passages, fewer water leaks, and space savings.

[Brief explanation of drawings]

Fig. 1 is a schematic sectional view of a hot water heating device according to an embodiment of the present invention, Fig. 2 is a control circuit diagram thereof, Fig. 3 is a sectional view of the heating hot water storage section, and Fig. 4 is a diagram showing water heating in the hot water storage room. FIG. 5 is a block diagram showing the flow state during hot water supply, and FIG. 6 is a hot water temperature control characteristic diagram. 1... hot water storage heating section, 2... heating element, 3... heating channel, 4... instantaneous heat exchanger, 5... hot water storage chamber, 7
. . . Reversible water pump, 8 . . . Water supply channel, 9 . . . Channel opening/closing means, 10 .

Claims (1)

[Claims] 1. A heating hot water storage section in which an instantaneous heat exchanger consisting of a heating element and a heating passage provided around the heating element is installed inside the hot water storage chamber, a water supply channel having a check valve and a reversible water pump, The reversible water pump is composed of an outflow passage having an opening/closing means, a bypass passage communicating with the suction side of the reversible water pump and having a valve inserted therein, and a control unit. A hot water heating device configured to operate in reverse.