JPH0814549A - Operation controller for hot-water supplier - Google Patents

Abstract

PURPOSE:To contrive the supply of hot-water while adjusting the temperature thereof so as to be a set supplying hot-water temperature quickly even upon a trouble of an inlet water temperature sensor by a method wherein trouble indication is effected and necessary amount of heat of combustion is operated employing an inlet water temperature before the trouble to effect feedforward control upon the trouble of the inlet water temperature sensor. CONSTITUTION:Upon a trouble of an inlet water temperature sensor 11, a controller 50 indicates the trouble of the inlet water temperature sensor 11 on an indicating unit of a remote controller 51 or the like and commands the combustion of a burner 40 in spite of the trouble indication. Then, the controller 50 operates the temporary necessary amount of combustion of a burner 40 from a stored inlet water temperature, an inlet water flow rate and a set supplying hot-water temperature to effect a temporary feedforward control with respect to the burner 40 while the feedback control of the combustion of the burner 40 is effected based on a supplying hot-water temperature, detected by the supplying temperature sensor 31, and a set supplying hot-water temperature.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a hot water heater operation control device.

[0002]

2. Description of the Related Art Conventionally, in a water heater in which water from a water supply pipe or the like is introduced from an inlet pipe to an instantaneous heat exchanger heated by a burner and discharged to a hot water outlet pipe, at least a feedforward control is used as an operation control method. In this case, the required combustion heat quantity of the burner is calculated from the incoming water temperature, the incoming water flow rate and the set hot water temperature, so if the incoming water temperature sensor etc. fails, the required combustion heat quantity cannot be calculated. , The operation of the device was stopped. Also,
In the Japanese Utility Model Laid-Open No. 61-181942 filed by the applicant of the present application, in a water heater that performs feedforward control and feedbag control, when the water temperature sensor fails, the hot water temperature sensor operates only by the feedbag control and There is provided an operation control device that operates only by feedforward control when a failure occurs.

[0003]

However, there is a drawback that a device that stops operation when the above-mentioned water temperature sensor or the like fails cannot be used until it can be repaired. Further, in the above-mentioned Japanese Utility Model Laid-Open No. 61-181942, when the water temperature sensor fails, only feedback control is performed, so it takes time to adjust the hot water temperature to a predetermined set temperature, especially at the initial hot water temperature. In the above, a preferable temperature cannot be expected.

Therefore, the present invention solves the above-mentioned drawbacks of the prior art, and even if the incoming temperature sensor fails, emergency operation can be performed without stopping the device, and feedforward control can be continued. It is an object of the present invention to provide an operation control device for a water heater that can quickly adjust the temperature to a predetermined set hot water temperature and discharge hot water.

[0005]

In order to achieve the above object, the operation control device for a water heater of the present invention introduces water from a water supply pipe or the like from an inlet pipe to an instantaneous heat exchanger heated by a burner, and discharges hot water. In addition to providing hot water to the pipe, the water inlet pipe is provided with a water inlet temperature sensor and a water inlet flow rate sensor, the hot water outlet pipe is provided with a hot water outlet temperature sensor, and the required combustion heat quantity is calculated from the water inlet temperature, the water inlet flow rate and the set hot water temperature. An operation control device for a water heater, in which feed-forward control of the burner is performed and feedback control of the burner is performed based on the obtained hot water temperature and the set hot water temperature, and the water temperature sensor has failed. In this case, a controller is provided for performing a feed-forward control by displaying a failure display and calculating the required amount of heat of combustion using the incoming water temperature before the failure.

[0006]

According to the above feature of the present invention, when the incoming water temperature sensor fails, the controller gives a failure indication. Furthermore, the controller uses the inlet water temperature before failure stored in itself, calculates the tentative required combustion heat quantity of the burner from this, the inlet water flow rate, and the set hot water temperature, and performs tentative feedforward control for the burner. . Of course, normal feedback control is also performed in addition to this provisional feedforward control. The incoming water temperature changes depending on the season, etc., but normally the incoming water temperature does not change abruptly between the previous operation and the current operation, so the provisional feedforward control and normal feedback control Even if the operation is performed by and, there will be no particular problem, and the hot water discharge characteristics will be better especially at the initial time of hot water discharge than when only feedback control is performed. Of course, the operation of the device is not stopped and cannot be used.

[0007]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS FIG. 1 is an overall configuration diagram of a water heater showing an embodiment of the device of the present invention, and FIG. 2 is a flow chart for explaining a control mechanism of a controller.

In FIG. 1, reference numeral 10 is a water inlet pipe, through which water from a tap or the like is introduced to an instantaneous heat exchanger 20 and heated, and is heated to a hot water outlet pipe 30. The water inlet pipe 10 is provided with a water temperature sensor 11 and a water flow sensor 12.
Further, the hot water outlet pipe 30 is provided with a hot water outlet temperature sensor 31 and an overflow prevention controller 32. The instantaneous heat exchanger 20 is heated by the burner 40, so that the water passing through the inside of the instantaneous heat exchanger 20 is heated. The burner 40 is, for example, a gas burner, and the gas fuel that has passed through the gas electromagnetic valve 42 of the gas supply pipe 41 is supplied to the burner 40 after the gas amount is adjusted by the proportional valve 43.
44 is a blower fan. The controller 50 controls the entire device.
Done by That is, the controller 50 has a built-in microcomputer, inputs information from the respective sensors 11, 12, 31,
Also, based on commands related to driving from the remote control 51 etc.,
A predetermined calculation for control is performed, and a predetermined control command is output to the burner 40 and its associated equipment 42, 43, 44 and the like.

The control mechanism of the controller 50 will be further described with reference to FIG. 2. Now, when the water temperature sensor 11 detects the minimum operating water amount or more by opening the hot water supply tap at the end (not shown), the controller 50 causes the burner 40 to operate. However, prior to that, the controller 50 determines whether the outlet hot water temperature thermistor which is the outlet hot water temperature sensor 31 and the incoming water temperature thermistor which is the incoming water temperature sensor 11 are normal (S1). , S2). For example, if the hot water temperature sensor 31 and the hot water temperature sensor 11 are in an open (broken) state or a short-circuited state, it is determined that a failure has occurred. If both the outlet hot water temperature sensor 31 and the incoming water temperature sensor 11 are normal (Yes in S1 and Yes in S2), the controller 50 determines the incoming water temperature sensor.
The temperature of the incoming water from 11 is stored (S3), and the burner 40 is instructed to burn (S4). Then, the controller 50 calculates the required combustion heat quantity of the burner 40 from the incoming water temperature by the incoming water temperature sensor 11, the set hot water temperature, and the incoming water flow rate by the incoming water flow rate sensor 12, and feed-forward control (FF control) the combustion of the burner 40. At the same time, the combustion of the burner 40 is feedback-controlled (FB control) based on the hot water temperature actually detected by the hot water temperature sensor 31 and the set hot water temperature (S).
5). The storage of the water temperature may be stored as the latest one normally detected by the water temperature sensor 11, or may be the first one detected at the initial stage of operation after the water temperature sensor 11 is judged to be normal. It may be stored.

On the other hand, the outlet temperature sensor 31 is normal (S1
Yes), the incoming water temperature sensor 11 has failed (No in S2)
In this case, the controller 50 displays the failure of the water temperature sensor 11 on the display unit such as the remote controller 51 (S6), and nevertheless commands the combustion of the burner 40 (S7). In this case, the controller 50 uses the inlet temperature before the failure of the inlet temperature sensor 11 stored by itself to determine the temporary required combustion heat amount of the burner 40 from the stored inlet temperature, the inlet flow rate, and the set outlet temperature. Calculate and perform temporary feed-forward control (temporary FF control) for the burner 40, and the hot water temperature sensor
The combustion of the burner 40 is feedback-controlled (FB control) based on the hot water outlet temperature actually detected by 31 and the set hot water outlet temperature (S8). The description of the provisional feedforward control means that the feedforward control is performed using the provisional required heat of combustion, and the feedforward control itself is not particularly special. Even if you use the water temperature before the water temperature sensor 11 fails,
Since the incoming water temperature does not change abruptly, the tentative feedforward control can be performed in a state sufficiently close to the feedforward control that should be performed using the actual incoming water temperature.

When the hot water temperature sensor 31 is out of order (NO in S1), the controller 50 does not perform the feedback control but only the feed forward control to adjust the hot water temperature (S9). Of course, also in this case, the failure display of the hot water temperature sensor 31 is displayed on the display unit such as the remote controller 51. Furthermore, when the incoming water temperature sensor 11 is also out of order, the feedforward control by the controller 50 is of course provisional feedforward control.

[0012]

According to the operation control apparatus of the water heater according to the first aspect of the present invention, when the water temperature sensor fails, a failure display is displayed and a failure is displayed. Since a controller that performs feedforward control by calculating the required combustion heat quantity using the input water temperature of No. 1 is provided, even if the input water temperature sensor fails, emergency operation can be performed without stopping the device. Moreover, even though it is the water temperature before the failure, the water temperature changes depending on the season, etc., but normally the water temperature does not suddenly change greatly between the previous operation and the current operation. After all, even in the case of the feedforward control using the temporary value, it is possible to obtain the effect of sufficiently approximating the feedforward control to be performed with respect to the actual incoming water temperature. Therefore, by performing the control by the combination of the provisional feedforward control and the feedback control, it is possible to perform hot water supply with sufficiently satisfactory hot water discharge characteristics particularly at the initial hot water discharge time as compared with the case of relying only on the feedback control.

[Brief description of drawings]

FIG. 1 is an overall configuration diagram of a water heater showing an embodiment of the device of the present invention.

FIG. 2 is a flowchart illustrating a control mechanism of a controller.

[Explanation of symbols]

 10 Inlet pipe 11 Inlet temperature sensor 12 Inlet flow sensor 20 Instantaneous heat exchanger 30 Hot water pipe 31 Hot water temperature sensor 40 Burner 50 Controller

 ─────────────────────────────────────────────────── ─── Continuation of the front page (72) Inventor Yoji Hatake, 32 Akashi-cho, Chuo-ku, Kobe-shi, Hyogo Stock company, Noritsu (72) Inventor Kenken Kubota, 32 Akashi-cho, Chuo-ku, Kobe, Hyogo Stock company In Noritz

Claims (1)

[Claims] 1. The water from a tap or the like is introduced from an inlet pipe to an instantaneous heat exchanger heated by a burner so as to be discharged to a hot water outlet pipe, and an inlet temperature sensor and an inlet flow rate sensor are provided on the inlet pipe. Provide a hot water temperature sensor on the hot water pipe,
Of the water heater, the required combustion heat quantity is calculated from the incoming water temperature, the incoming water flow rate, and the set hot water temperature to perform feedforward control of the burner, and the burner is feedback-controlled based on the obtained hot water temperature and the set hot water temperature. The operation control device is provided with a controller for performing a feedforward control by displaying a failure indication when the water temperature sensor fails and calculating a required combustion heat quantity using the water temperature before the failure. An operation control device for a water heater.