JPH0599512A - Control apparatus for hot-water supply - Google Patents

Abstract

PURPOSE:To obtain the title apparatus whereby an actual temperature of hot-water poured-out is allowed to coincide with an aimed temperature even if a hot-water supply pipe is relatively long in length, by providing a detecting means for detecting the hot-water temperature on the hot-water supply pipe. CONSTITUTION:On a hot-water pouring out utensil 5, a thermistor S3 for hot-water is provided as a detecting means 3 for detecting hot-water temperature at the outlet side of a heat-exchanger 1. A sensor S1 for the rate of water-flow, the thermistor S3, a push type switch 6 and an aimed temperature detecting and presetting device 7 are respectively connected to a control part C. In order that the temperature detected by the thermistor S3 is allowed to coinside with an aimed temperature, the control part C is composed so that the operation of shut-off valves 9, 10, a regulating valve 11, an opening-and-closing valve 14, an ignition plug 15 and a driving motor 34 can be controlled on the basis of previously set and stored data and different kinds of inputted data. That is to say, a control means 100 is composed by using the control part C. In such a manner, since the detecting means is provided on a hot-water supply pipe, the distance between the place where the hot-water temperature is detected and the place where hot-water is poured-out through the hot-water supply pipe, can be shortened.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a heat exchanger for heating water, heating means for heating the heat exchanger, and a water supply port and a hot water supply pipe connection port via the heat exchanger. A water supply channel communicating with the main body case is provided, and a detection unit that detects the hot water temperature at the outlet side of the heat exchanger, a setting unit that sets a target temperature, and a detection temperature of the detection unit are the target temperature. And a control means for controlling the operation of the heating means so that the hot water supply pipe is connected to the hot water supply pipe connection port.

[0002]

2. Description of the Related Art Conventionally, a detecting means for detecting the hot water temperature on the outlet side of a heat exchanger has been provided in a main body case.

[0003]

In the above-mentioned prior art, when the hot water supply pipe is relatively long, there is a possibility that the actual hot water discharge temperature may be considerably lower than the target temperature due to heat release. An object of the present invention is to eliminate the above-mentioned conventional drawbacks and to obtain a hot water supply control device capable of making the actual hot water discharge temperature equal to the target temperature even when the hot water supply pipe is relatively long.

[0004]

To achieve this object, the hot water supply control device according to the present invention is characterized in that the detecting means is provided in the hot water supply pipe.

[0005]

Since the detecting means is provided in the hot water supply pipe, the distance from when the hot water temperature is detected to when hot water is discharged from the hot water supply pipe can be shortened.

[0006]

Since the hot water temperature is detected near the point where hot water is actually discharged, the actual hot water temperature can be made to match the target temperature even when the hot water supply pipe is relatively long.

[0007]

Embodiments of the present invention will be described below with reference to the drawings. As shown in FIGS. 1 and 3, there are provided a hot water supply unit A for heating water supplied from the water inlet 12 and supplying it to the hot water supply pipe connection port 13, and a control unit C for controlling the hot water supply unit A. .. The hot water supply unit A and the control unit C are provided in the main body case K. The hot water supply pipe 4 is connected to the hot water supply pipe connection port 13 of the main body case K.

In the hot water supply unit A, a heat exchanger 1 for heating water,
A burner 2 as a heating means for heating the heat exchanger 1 and a spark plug 15 are provided. In the water supply path W1 that connects the water inlet 12 and the hot water supply pipe connection port 13, a water amount sensor S1 that detects the water quantity Qo in the water supply path W1, a water temperature thermistor S2 that detects the water temperature Ti supplied to the water supply path W1, and a water supply An electromagnetic on-off valve 14 that opens and closes the passage W1 and a mixing valve 3 that adjusts a distribution ratio k of hot water and water are provided. The water supply passage W1 is branched into a heated passage W2 provided with the heat exchanger 1 and a bypass passage W3 bypassing the heat exchanger 1. In the fuel supply path G1 to the burner 2, electromagnetic shutoff valves 9 and 10 and a control valve 11 for adjusting the fuel supply amount are interposed. A push switch 6 and a heat exchanger 1 are provided on the front surface of the body case K.
A target temperature setter 7 as a setting means for setting the target temperature Ts on the outlet side of the, and a target temperature indicator 8 are provided. In FIG. 1, reference numeral 34 is a drive motor for changing the distribution ratio of the mixing valve 3. At the tip of the hot water supply pipe 4,
A bathing device 5 is provided. The water heater 5 has a heat exchanger 1
A hot water temperature thermistor S3 is provided as a detecting means for detecting the hot water temperature at the outlet side of

A water amount sensor S1, a water temperature thermistor S2, a hot water temperature thermistor S3, a push switch 6, and a target temperature detection setting device 7 are connected to the control section C, respectively. Then, the control unit C sets the shutoff valves 9 and 10, the control valve 11 and the open / close valve 14 so that the detected temperature of the hot water thermistor S3 becomes the target temperature Ts based on the preset and stored information and various input information. , The ignition plug 15 and the drive motor 34 are controlled. That is,
The control unit 100 is configured using the control unit C.

Control of the burner 2 and the mixing valve 3 (hot water supply temperature control) will be described. First, the heating amount Ip of the burner 2 is set to the target temperature Ts, the water supply temperature Ti, the hot water temperature To,
Also, it is obtained based on the water amount Qo in the water supply passage W1. That is, it is obtained based on the equation 1.

[0011]

[Expression 1] Ip = Ka × (Ts−Ti) × Qo + Kp × ΔT + Ki × ∫ΔTdt

ΔT is a deviation between the target temperature Ts and the hot water temperature To, and Ka, Kp and Ki are constants.

Next, the distribution rate k of the amount of water is determined so that the hot water temperature on the downstream side of the heated path W2 becomes a predetermined temperature (here, 70 degrees). That is, it is obtained based on the equation 2.

[0014]

## EQU00002 ## k = Q1 / Q2 = (70-Ts) / (Ts-Ti)

Q1 is the amount of water in the bypass passage W3, and Q2 is the amount of water in the heated passage W2. The correspondence relationship between the distribution ratio k and the rotation angle of the drive motor 34 is set and stored in advance, and the drive motor 34 is controlled so that the obtained rotation angle is obtained.

Next, the operation of the control section C will be described with reference to the flow chart shown in FIG. First, it is determined whether or not the push switch 6 is ON. If it is OFF, it is determined whether or not hot water is being supplied up to the present. If it is not being supplied, it returns. If it is being supplied, the on-off valve 14 is closed and the burner 2 is extinguished. Fire extinguishing process is performed, and then the process returns. When it is determined that the push switch 6 is ON in the above determination, it is determined whether or not the ignition is being performed, and only when the ignition is not being performed, the opening / closing valve 14 is opened and the burner 2 is ignited. Ignition processing is executed. The outlet hot water temperature To is equal to the target temperature Ts and the heated path W is
The above hot water supply temperature control for controlling the operation of the burner 2 and the mixing valve 3 is executed so that the hot water temperature on the downstream side of 2 becomes a predetermined temperature (70 degrees).

[Other Embodiments] In the above embodiment, the hot water supply temperature control is executed by the feedforward + feedback control, but the hot water supply temperature control may be executed only by the feedback control.

It should be noted that reference numerals are given in the claims for convenience of comparison with the drawings, but the present invention is not limited to the configuration of the accompanying drawings by the entry.

[Brief description of drawings]

FIG. 1 is a block diagram of a control configuration.

FIG. 2 is a flowchart of control operation.

[Figure 3] Front view of the water heater

[Explanation of symbols]

 1 heat exchanger 2 heating means 4 hot water supply pipe 7 setting means 12 water supply port 13 hot water supply pipe connection port 100 control means S3 detection means W1 water supply channel K body case

Claims (1)

[Claims] 1. A heat exchanger (1) for heating water, a heating means (2) for heating the heat exchanger (1), and a water supply port () through the heat exchanger (1). A water supply passage (W1) that connects the hot water supply pipe connection port (13) with the hot water supply pipe connection port (13) is provided in the main body case (K), and a detection means (for detecting the hot water temperature at the outlet side of the heat exchanger (1) ( S3), setting means (7) for setting a target temperature, and control means (100) for controlling the operation of the heating means (2) so that the temperature detected by the detection means (S3) becomes the target temperature. And a hot water supply pipe (4) connected to the hot water supply pipe connection port (13), wherein the detection means (S3) is provided in the hot water supply pipe (4). Control device.