JPH0861775A - Fin clogging detector for heat exchanger - Google Patents

Abstract

PURPOSE: To provide a fin clogging detector for a heat exchanger capable of detecting clogging of a fin for the heat exchanger on the followup boiling side accurately to stop the operation of the apparatus in a one boiler dual circuit type water heater in which a heat exchanger set for followup bath boiling and a heat exchanger set for general heating of water are arranged parallel on both sides through a simple partition in one heat exchange boiler body. CONSTITUTION: A controller 50 is provided to judge that a clogging occurs in a fin of a heat exchanger 21 with a fin 21a of a set for bath followup boiling and the bath followup boiling operation is stopped when a rising value of the temperature of a bathtub per unit time during the bath followup boiling operation is smaller than a reference value obtained previously as the minimum temperature rising value per unit time in the normal operation.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a device for detecting fin clogging of a heat exchanger.

[0002]

2. Description of the Related Art A heat exchanger with fins for bath reheating and its burner set and a heat exchanger with fins for general hot water supply and its burner set are easily provided in one heat exchange can body. Conventionally, there has been provided a hot water supply device arranged on both sides of the partition wall with a partition wall. In this water heater, when the bath reheating switch is turned on, the burner of the bath reheating set is burned, and the bath water is circulated in the finned heat exchanger to reheat the water. When the general hot water supply is switched on, the burner of the general hot water supply set is burned, and the water from the tap water or the like is introduced into the heat exchanger with fins to be supplied as hot water. The device can be made compact by housing the bath reheating set and the general hot water supply set in one heat exchange can body.

[0003]

However, in the case of a one-can-two-circuit water heater in which the above-mentioned two sets for heat exchange are arranged in parallel on both sides through a simple partition, for example, a bath follower is attached by the attachment of soot. When fins are clogged in the heat exchanger with fins for heating, the high-temperature combustion exhaust gas generated from the burner during the bath heating operation will not be exhausted upwards through the heat exchanger with fins for heating the bath. , Instead, it escapes from the bath reheating side to the general hot water supply side and is discharged to the outside from there. Therefore, not only does the bath temperature not rise due to reheating the bath, but the can walls on the reheating side of the bath are not overheated to high temperatures, so the abnormality detection function by the high limit switch etc. does not work well, and the device due to fin clogging There was a problem that it could not be stopped. The above problem is the same when fins of a heat exchanger with fins on the general hot water supply side are clogged, but it takes time for the user to notice abnormally in the case of reheating the bath, so the heat of the bad one There is also a problem that the exchange etc. may be damaged.

In view of the above, the present invention solves the above-mentioned drawbacks of the conventional apparatus, and a heat exchanging set for reheating a bath and a heat exchanging set for general hot water supply are provided in a single heat exchange can body through a simple partition wall. In a 1-can / 2-circuit hot water supply device arranged in parallel on both sides of the heat exchanger, fin clogging of the heat exchanger on the bath heating side can be reliably detected, and fin clogging of the heat exchanger can be stopped. The purpose is to provide a device.

[0005]

In order to achieve the above object, a fin clogging detection device for a heat exchanger according to the present invention is a set including a finned heat exchanger used for bath reheating and a burner for heating the finned heat exchanger. And a heat exchanger with fins used for general hot water supply and a set consisting of a burner for heating the heat exchanger are arranged on both sides of the heat exchange can body through a simple partition to reheat the bath. Hot water is supplied by using the burner and finned heat exchanger of the bath reheating set during operation, and general hot water is supplied by using the burner and finned heat exchanger of the general hot water supply set during normal hot water supply operation. A device for detecting fin clogging of a heat exchanger with fins of the bath reheating set in a device, the unit being hit for a unit time during the bath reheating operation. If the bath temperature rise value of the bath is smaller than the reference value obtained in advance as the minimum temperature rise value per unit time under normal conditions, it is judged that the fins of the heat exchanger with fins for bath heating system are clogged with fins. It is characterized by the provision of a controller for stopping the burning operation.

[0006]

According to the above feature of the present invention, when the fin heat exchanger of the bath reheating set is clogged with fins during the bath reheating operation, heat is generated even if the burner is burning. The circulating bath water is not sufficiently heated in the heat exchanger because the exchanger is not heated sufficiently. The controller compares the bath temperature rise value per unit time during the bath reheating operation with the minimum temperature rise value per unit time during normal operation, which is stored as a reference value, and the bath temperature rise value per unit time is If it is smaller than the reference value, it is determined that the fins of the heat exchanger on the bath reheating side are clogged, and the bath reheating operation is stopped.

[0007]

DESCRIPTION OF THE PREFERRED EMBODIMENTS The present invention will be described below based on embodiments.
FIG. 1 is an overall configuration diagram of a hot water supply device including the device of the present invention, and FIG. 2 is a flowchart showing a fin clogging detection mechanism by a controller.

In FIG. 1, a set consisting of a heat exchanger 21 with a fin 21a for bath heating and a burner 22 in a heat exchange can body 10 and a heat exchanger 31 with a fin 31a for general hot water supply.
And a burner 32 are arranged in parallel on both sides with a simple partition wall 11 opened at the upper and lower positions. 12 is a blower.

Bath reheating is performed by circulating the bath water from the bathtub 40 through the bath reheating circulation path 23 to the heat exchanger 21 with fins 21a in the heat exchange can body 10 and by burning the burner 22. Be seen. A circulation pump 24, a water flow switch 25, and a bath temperature sensor 26 are provided in the return pipe of the bath reheating circulation path 23, and a fuel supply valve 27 is provided in the burner 22. When the bath reheating switch is turned on, the circulation pump 24 is driven under the control of the controller 50, which will be described later, and when the water flow switch 25 is turned on, the fuel supply valve 27 opens and the burner 22 is ignited. Reheating is started by heating. When the bath temperature sensor 26 detects the set bath temperature, the reheating ends. In the general hot water supply, water from the water supply is introduced into the heat exchanger 31 with fins 31a in the heat exchange can body 10 through the water supply passage 33, is instantaneously heated and is discharged to the hot water supply passage 34, and from the terminal curran 35 or the like. Hot water is supplied. The burner 32 is provided with a fuel supply valve 36.

The controller 50 controls the entire apparatus, inputs information from the water flow switch 25, the bath temperature sensor 26, other sensors, etc., and performs a predetermined operation by the built-in control software on the burner 22, 32, circulation pump 24,
Command fuel supply valves 27, 36 and other components.

A fin 21a clogging detection mechanism of the heat exchanger 21 for bath reheating by the controller 50 will be described with reference to FIG. The controller 50 stores in advance the minimum temperature rise value per unit time during normal operation in the bath reheating operation as the reference value ΔT _m . The minimum temperature rise value that is this reference value ΔT _m is, for example, the unit at the lowest heating efficiency when the burner 22 is burned with the lowest input of the bath reheating operation and the reheating is performed with the water level of the bathtub 40 being the maximum water level. It can be experimentally obtained as a temperature rise value per unit time. Now, when the reheating operation is started (Yes in S1), the controller 50 monitors the temperature detected by the bath temperature sensor 26, calculates the temperature rise value ΔT per unit time, and uses it as the reference value ΔT _m. (S2). When the temperature rise value ΔT is smaller than the reference value ΔT _m (Yes in S2), the controller 50 determines that the fins 21a of the heat exchanger 21 are clogged (S3), and the failure display is touched by the user. At the same time, the combustion of the burner 22 is stopped, the driving of the circulation pump 24 is stopped, and the bath reheating operation is stopped (S4).

[0012]

According to the present invention, there is provided the above construction.
According to the fin clogging detection device of the heat exchanger described in (1), the bath temperature rise value per unit time during the bath reheating operation is smaller than the reference value previously obtained as the minimum temperature rise value per unit time in the normal state. In this case, a controller was installed to stop the bath reheating operation when the heat exchanger with fins in the bath reheating set is judged to be clogged with fins.Therefore, a heat exchanger for bath reheating and heat exchange for general hot water supply In a 1-can 2-circuit hot water supply device in which a water heater and a water heater are arranged in parallel in a single heat exchange can through a simple partition wall, if a fin clogging of the heat exchanger for bath reheating occurs, It is possible to surely detect and to safely stop the device.

[Brief description of drawings]

FIG. 1 is an overall configuration diagram of a hot water supply device including the device of the present invention.

FIG. 2 is a flowchart showing a fin clogging detection mechanism by a controller.

[Explanation of symbols]

 10 Heat exchange canister 11 Simple partition wall 21 Heat exchanger for bath reheating 21a Fin 22 Burner 26 Bath temperature sensor 31 Heat exchanger for general hot water supply 31a Fin 32 Burner 40 Bath 50 Controller

 ─────────────────────────────────────────────────── ─── Continuation of front page (72) Inventor Hiroki Ohara 32 Akashi-cho, Chuo-ku, Kobe-shi, Hyogo Stock company Noritsu (72) Inventor Kuji Kate 32 Akashi-cho, Chuo-ku, Kobe, Hyogo Stock company In Noritz

Claims (1)

[Claims] 1. A set consisting of a heat exchanger with fins used for bath reheating and a burner for heating it, and a set consisting of a heat exchanger with fins used for general hot water supply and a burner for heating it. It is arranged on both sides of a single heat exchange can through a simple partition, and when the bath is reheated, it is reheated using the burner and fin heat exchanger of the bath reheating set. It is a device that detects fin clogging of the finned heat exchanger of the bath reheating set in a hot water supply device that performs general hot water supply using the burner and finned heat exchanger of the general hot water supply set during hot water supply operation. The standard value obtained in advance as the minimum temperature increase value per unit time during normal operation is the bath temperature increase value per unit time during bath reheating operation. If the value is smaller than the value, a fin clogging detection device for the heat exchanger is provided with a controller for judging the fin clogging of the heat exchanger with fins for the bath reheating set and stopping the bath reheating operation. .