JPH08136049A - Water heater - Google Patents

Abstract

PURPOSE: To obtain a water heater capable of conducting safe and efficient supply of hot water. CONSTITUTION: A water heater wherein water supplied through a water-supply- side pipeline C1 is heated by a heat exchanger 1, water is joined to and mixed in this high-temperature water to make it be of a set temperature and hot water thus obtained is supplied through a hot-water-supply-side pipeline C2. The water heater has a temperature setting means 13, a flow sensor 7, an incoming water sensor 8 and an outgoing hot water sensor 5 and it is so constructed that a heat input to the heat exchanger 1 is controlled according to a temperature detected by the incoming water sensor 8, a flow rate detected by the flow sensor 7 or the set temperature and thereby the temperature of the hot water supplied by the heat exchanger 1 is varied. It is so constructed, besides, that the heat input to the heat exchanger 1 is controlled according to the temperature detected by the incoming water sensor 8 or the set temperature and thereby the temperature of the hot water supplied by the heat exchanger 1 is varied. Moreover, an upper limit value is set for the temperature of the supplied hot water.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a gas water heater and a petroleum water heater, and more specifically, the heat exchange capacity of the heat exchanger can be changed by changing the hot water outlet temperature according to the incoming water temperature, flowing water flow rate, set temperature, etc. The present invention relates to a water heater that maximizes the above-mentioned effect and enables efficient hot water supply.

[0002]

2. Description of the Related Art Conventionally, in this type of water heater, the burner of the heat exchanger starts combustion by opening the faucet and heats the water flowing from the water supply side (heat exchange). The heat exchange temperature at is uniquely determined from the set temperature. That is, it is generally set to be higher than the set temperature by 20 to 30 deg. In addition, the amount of water entering the heat exchanger is limited to less than the set flow rate by the flow rate adjustment valve attached to the hot and cold water piping.
Combines high-temperature water heated to a specified temperature with a heat exchanger with water.
The hot water level is adjusted by mixing, and hot water is supplied at a desired set water temperature.

[0003]

However, as described above, since the amount of water input to the heat exchanger is less than a certain amount and the heat exchange temperature is uniquely determined, the water input temperature becomes high in summer. In that case, there is a drawback that the heat exchange capacity of the heat exchanger cannot be fully exhibited. For example, 2
19 heat exchangers with heat exchange capacity of 4000 KCal
When used at 000 KCal, the operation becomes extremely inefficient.

An object of the present invention is to provide a water heater which eliminates the above-mentioned drawbacks and is capable of supplying hot water safely and efficiently.

[0005]

That is, according to the present invention, the water supplied through the water supply side pipe is heated by a heat exchanger, and the high temperature water is mixed and mixed with water to set the temperature, and the hot water supply side pipe is connected. A water heater for supplying hot water through a passage, having a temperature setting means, a flow rate sensor, a water entry sensor, and a hot water exit sensor, the temperature detected by the water entry sensor, or the flow rate detected by the flow rate sensor,
Alternatively, the heat input to the heat exchanger is controlled according to the set temperature, and the outlet temperature of the heat exchanger is changed.

Further, according to the present invention, the water supplied through the water supply side pipe is heated by the heat exchanger, the high temperature water is joined and mixed with the water to set the temperature, and the hot water is supplied through the hot water supply side pipe. A water heater having a temperature setting means, a flow rate sensor, a water inlet sensor, and a hot water outlet sensor, and controls heat input to the heat exchanger according to the temperature detected by the water inlet sensor or the set temperature. Then, the hot water temperature of the heat exchanger was changed.

Further, according to the present invention, the water supplied through the water supply side pipe is heated by the heat exchanger, the high temperature water is joined and mixed with water to set the temperature, and the hot water is supplied through the hot water supply side pipe. A water heater having a temperature setting means, a flow rate sensor, a water entry sensor, and a hot water sensor, and the temperature detected by the water entry sensor, or the flow rate detected by the flow rate sensor, or the heat depending on the set temperature. The heat input to the exchanger is controlled so that the hot water outlet temperature of the heat exchanger is changed within a predetermined temperature. Alternatively, the heat input to the heat exchanger is controlled according to the detected temperature of the water input sensor or the set temperature, and the hot water temperature of the heat exchanger is changed within a predetermined temperature.

[0008]

[Operation] With the above configuration, in the present invention, when the operation of the equipment is started, the heat quantity necessary for heat exchange is calculated from the set temperature, the amount of water input to the heat exchanger, and the water input temperature, and the capacity of the heat exchanger is calculated. The heat exchange temperature gradually rises while there is room to spare.

Further, according to the present invention, when the operation of the equipment is started, the incoming water temperature of the heat exchanger is checked, and if the water temperature is equal to or higher than the specified temperature, the heat exchange temperature is increased.

Further, in the present invention, the rise of the hot water discharge temperature is stopped with the predetermined temperature determined in advance as the upper limit.

In this way, the hot water supply amount can be increased by raising the hot water discharge temperature of the heat exchanger.

[0012]

FIG. 1 is a schematic view showing an embodiment of a gas water heater according to the present invention.

In the figure, reference numeral 1 is a heat exchanger, and a burner 2 is connected to a combustion gas pipe through a gas proportional valve 4 for adjusting the gas amount and a gas valve 6 for supplying gas. A fan motor 3 for supplying combustion air to the burner 2 is attached to the. Further, the water inlet side of this heat exchanger 1 is a water supply side conduit C1.
Is connected to the water supply pipe A via the
A flow sensor 7 for detecting the amount of supplied water and a water sensor 8 for detecting the water temperature are sequentially arranged in the. On the other hand, the hot water supply side of the heat exchanger 1 is provided with a hot water supply side conduit C2 provided with a flow rate control valve 9 for limiting the amount of hot water discharged below a set flow rate, and a faucet plug 12 is attached to the tip thereof. Further, the hot water supply side conduit C2 has a hot water discharge sensor 5 for detecting the hot water temperature in the heat exchanger 1.
A hot water supply sensor 11 for detecting hot water supply water temperature is provided.

In this way, the water supply pipe A → the water supply side pipe C1 →
A series of hot and cold water supply pipes from the water supply to the hot water supply is formed in the flow path such as the heat exchanger 1 → hot water supply side pipe C2 → faucet plug 12, and this hot water supply pipe line is directly connected from the water supply side pipe line C1. A bypass pipe C3 for supplying water to the hot water supply side pipe C2 is provided, and a hot and cold water mixing valve 10 for adjusting the amount of flowing water is attached at a confluence with the hot water supply side pipe C2.

Reference numeral 13 denotes a remote control panel having a temperature setting key as a temperature setting means, which is usually installed in a kitchen or the like, and is capable of remotely operating and stopping the equipment, or setting the hot water supply temperature. By the way, the operation control device 14 is incorporated in the equipment.
The hot water supply operation is controlled by.

The configuration of the gas water heater is as described above, and its operation will be described below. The control is performed by the microcomputer (hereinafter referred to as a microcomputer) mounted on the operation control device 14.

When the operation switch is operated, the equipment starts up,
When the faucet plug 12 is opened, water flows in from the water supply pipe A, this is detected by the flow rate sensor 7, the burner 2 is ignited, and the water heater starts operating. The water flowing into the heat exchanger 1 via the water supply side pipe C1 is heated and held at a predetermined temperature while the hot water discharge sensor 5 checks the hot water temperature at any time.
For example, if the hot water supply temperature is set to 40 ° C, the hot water outlet temperature is heated to about 60 ° C, which is higher than this.
It is supplied through the hot water supply side pipe C2, but at the confluence of the bypass pipe C3 branched from the water supply side, normal temperature water (for example, 20
C.) and the hot water temperature is adjusted to a preset temperature of 40.degree. C. and hot water is supplied from the faucet plug 12.

Although the above is the same as the hot water supply operation of the conventional water heater, the feature of the present invention lies in the heat exchanger 1 described above.
The heat exchange temperature is efficiently controlled by using the input water temperature, flowing water flow rate, set temperature, etc. as input parameters. In the present embodiment, the heat input to the heat exchanger 1 is transmitted to the PID by the microcomputer installed in the operation control device 14.
It is controlled, but its control block is shown schematically in FIG.

In FIG. 2, M is a microcomputer for controlling the operation of the equipment, and a remote control panel 13 is connected to this microcomputer M. Further, an input port of the microcomputer M is connected with a water input sensor 8, a hot water supply sensor 5, a hot water supply sensor 11, a flow rate sensor 7, etc., and an output port is connected with a gas proportional valve 4, a gas valve 6, a fan motor 3, etc. . The heat input control of the heat exchanger 1 is executed with the above configuration, and the control will be described based on the flowchart of FIG.

In this embodiment, it is assumed that the hot water supply temperature is set to 40 ° C. and the operation is started. When the microcomputer M recognizes the set temperature of 40 ° C. from the panel information, it temporarily sets the heat exchange temperature to 60 ° C. higher than this. Next, the microcomputer M calculates the heat quantity Q of the heat exchanger 1 required for heat exchange from the set temperature, the water temperature detected by the water sensor 8 and the flowing water quantity detected by the flow sensor 7, and the calculated value Q and the heat exchanger. Capacity of 1 (rated value) Qc
Compare with By the way, the amount of heat required for heat exchange (Kcal)
= (Set temperature-inlet temperature) x running water amount x time.

In the above judgment, Qc> Q, that is, if the operating capacity of the heat exchanger 1 has a margin, the hot water supply temperature detected by the hot water supply sensor 11 is compared with the set temperature, and if the detected temperature is below the set temperature. The gas proportional valve 4 is controlled so that the heat exchange temperature rises somewhat (for example, 5 ° C. in this embodiment) to increase the combustion amount. However, when the capacity of the heat exchanger 1 is insufficient, or when the hot water supply temperature exceeds the set temperature, the hot water supply operation is continued with the heat exchange temperature set at 60 ° C. In this way, the heat exchange temperature is gradually increased according to the capacity of the heat exchanger 1, but in this embodiment, the upper limit is set to 70 ° C. to ensure the safety of the equipment.

The flowchart of FIG. 4 shows another mode. The embodiment shown here is a simplification of the control described above, and has the advantage that the arithmetic processing of software is simplified while achieving the same effect. That is, according to this flowchart, the microcomputer M temporarily sets the heat exchange temperature to 60 ° C., then checks the incoming water temperature, and if the temperature is equal to or higher than the specified temperature (for example, 20 ° C.), the heat exchange temperature is immediately set to the upper limit value. Set to 70 ° C and run the heat exchanger at full power. After that, the hot water supply operation is continued in this state as long as the incoming water temperature does not drop below the specified value.

As described above in each embodiment,
It is possible to increase the amount of hot water supplied by maximizing the heat exchange capacity and raising the hot water discharge temperature of the heat exchanger. Especially when the water temperature is relatively high, such as in summer, the effect becomes extremely remarkable.

[0024]

As described above, according to the present invention, the water supplied through the water supply side pipe is heated by the heat exchanger, and the high temperature water is combined and mixed with the water to set the temperature, and the hot water is supplied. A water heater for supplying hot water through a pipe, which has a temperature setting means, a flow rate sensor, a water inlet sensor, and a hot water outlet sensor,
Since the temperature detected by the water sensor, or the flow detected by the flow sensor, or the heat input to the heat exchanger is controlled according to the set temperature, the hot water temperature of the heat exchanger is changed, When the incoming water temperature is high, the hot water supply amount can be increased by maximizing the heat exchange capacity of the heat exchanger and raising the outgoing hot water temperature, and the hot water supply efficiency can be greatly improved.

Further, according to the present invention, the water supplied through the water supply side conduit is heated by the heat exchanger, and the high temperature water is mixed and mixed with the water to obtain the set temperature, and the water is supplied through the hot water supply side conduit. A water heater for supplying hot water, comprising a temperature setting means, a flow rate sensor,
Since the water input sensor and the hot water output sensor are provided, the heat input to the heat exchanger is controlled according to the temperature detected by the water input sensor or the set temperature, and the hot water output temperature of the heat exchanger is changed. The effect of improving the efficiency of the water heater is not only the same as in the case described above, but also has the remarkable effect that the control of heat input to the heat exchanger becomes extremely simple.

Further, according to the present invention, the water supplied through the water supply side pipe is heated by the heat exchanger, and the high temperature water is joined and mixed with the water to set the temperature, and the hot water is supplied through the hot water supply side pipe. A water heater for supplying hot water, comprising a temperature setting means, a flow rate sensor,
A hot water sensor and a hot water sensor are provided, and the heat input to the heat exchanger is controlled according to the temperature detected by the hot water sensor, the flow rate detected by the flow rate sensor, or the set temperature, and hot water is discharged from the heat exchanger The temperature is changed within a predetermined temperature, or the heat input to the heat exchanger is controlled according to the temperature detected by the water sensor or the set temperature, and the hot water outlet temperature of the heat exchanger is within a predetermined temperature. Since there is no need to supply high temperature hot water more than necessary, the safety of the user is ensured.

[Brief description of drawings]

FIG. 1 is a schematic view showing an embodiment of a gas water heater according to the present invention.

FIG. 2 is a block diagram of an operation control device for the gas water heater.

FIG. 3 is an operation flowchart of the operation control device.

FIG. 4 is an operation flowchart different from FIG.

[Explanation of symbols]

 1 Heat Exchanger 5 Hot Water Sensor 7 Flow Sensor 8 Water Input Sensor 13 Temperature Setting Means (Remote Control Panel) C1 Water Supply Side Pipeline C2 Hot Water Supply Side Pipeline

Claims (3)

[Claims] 1. A water heater that heats water supplied through a water supply side conduit with a heat exchanger, joins and mixes the high-temperature water with water to set a temperature, and supplies hot water through the hot water supply side conduit. There is a temperature setting means, a flow rate sensor, a water entry sensor, and a hot water sensor, and the temperature detected by the water entry sensor, or the flow rate detected by the flow rate sensor, or the set temperature A water heater characterized by controlling heat input to change a hot water outlet temperature of the heat exchanger. 2. A water heater that heats water supplied through a water supply side pipe with a heat exchanger, joins and mixes water with this high-temperature water to a set temperature, and supplies hot water through the hot water supply side pipe. It has a temperature setting means, a flow rate sensor, a water entry sensor, and a hot water sensor, and controls the heat input to the heat exchanger according to the temperature detected by the water entry sensor or the set temperature, A water heater characterized by changing the hot water temperature of the exchanger. 3. A water heater that heats water supplied through a water supply side pipe with a heat exchanger, joins and mixes the high-temperature water with the water to set a temperature, and supplies hot water through the water supply side pipe. There is a temperature setting means, a flow rate sensor, a water entry sensor, and a hot water sensor, and the temperature detected by the water entry sensor, or the flow rate detected by the flow rate sensor, or the set temperature A water heater characterized by controlling heat input to change a hot water temperature of the heat exchanger within a predetermined temperature. Alternatively,
A water heater which controls heat input to the heat exchanger according to a temperature detected by the water sensor or a set temperature to change a hot water temperature of the heat exchanger within a predetermined temperature.