Hot water supply device
Inactive Publication Date: 2017-02-02
NORITZ CORP
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Benefits of technology
The present invention is related to a hot water supply device that includes a heat exchanger for applying heat to water with combustion gas. The device also includes a temperature detection means for detecting an exhaust temperature after heat exchange by the heat exchanger. The device further includes a determination means for determining that scale is deposited inside the heat exchange tubing of the heat exchanger if the exhaust temperature detected by the temperature detection means is higher than a set temperature. The technical effect of the invention is to provide a device that can efficiently detect and prevent scale deposition inside the heat exchange tubing of the heat exchanger, which can prolong the lifespan of the device and improve its overall performance.
Problems solved by technology
When the temperature of the hot water becomes high, it becomes easier for the scale to be separated out, and clogging by scale may occur due to scale being deposited inside the heat exchange tubing of the heat exchanger, so that the problems occur that the heat exchange efficiency of the heat exchanger is deteriorated, and that the temperatures of the heat exchange tubing and of its fins become elevated.
If the use of the hot water supply device is continued in the state in which the clogging by scale has occurred, then the heat exchanger may be repeatedly subjected to thermal stress, and there is a fear that the heat exchanger may be damaged due to cracking at the junction portions between the heat exchange tubing and the fins.
However, if clogging by scale is detected on the basis of elevation of the water temperature due to after-boiling after combustion has stopped, as with the device of Patent Document #1, then it is not possible to perform such detection during combustion operation, and, depending upon the relationship between the position where heat is applied and the position where the temperature sensor is attached, sometimes it may happen that, in the case of a combustion pattern in which the amount of combustion is low or in the case of a hot water supply device of high capacity, it becomes difficult to detect temperature elevation due to after-boiling.
Furthermore there is the problem that setting the standard for determination of clogging by scale is not simple or easy, since it is necessary to check the relationship between clogging by scale and after-boiling for each pattern of combustion.
Moreover with the device of Patent Document #2 there is the problem that, since the determination as to whether clogging by scale is taking place is performed by varying the amount of combustion during combustion operation, accordingly fluctuations of the amount of hot water supply or of the hot water supply temperature that are not according to the intention of the user may occur.
And, with the device of Patent Document #3, there is a danger that erroneous detection may occur, since the temperature of the combustion exhaust gas is estimated after heat exchange by the exhaust temperature estimation means based on the temperature of the previously heated water and the temperature of the output hot water.
Yet further, with the device of Patent Document #4, although combustion control is performed by measuring the temperature of the combustion exhaust gas after heat exchange, no means is disclosed for determining whether or not clogging by scale has occurred.
Method used
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Embodiment Construction
[0028]Hereinafter, embodiments for implementing the present invention will be explained on the basis of the following description.
[0029]First, the overall structure of a hot water supply device 1 according to the present invention will be explained.
[0030]The hot water supply device 1 is employed as a supply of heat such as a hot water supply device or a room heating device or the like, and, as shown in FIG. 1, is a gas-powered hot water supply device that supplies hot water by utilizing application of heat generated by combustion of fuel gas to cold water or to warm water.
[0031]This hot water supply device 1 comprises an air blower fan 2 that supplies air for combustion, a burner section 3 that combusts fuel gas, a heat exchanger section 4 that exchanges heat between the combustion gases from the burner section 3 and water, an exhaust aperture 5 that discharges the combustion gases after heat exchange by the heat exchanger section 4, conduits of various types such as a cold water in...
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A hot water supply device (1) includes: a fin and tube type heat exchanger (17) for aplying heat to water with combustion gas; a temperature detection means (32) for detecting an exhaust temperature after heat exchange by the heat exchanger (17); and a determination means that determines that scale is deposited within the heat exchange tubing (27) of the heat exchanger (17) if the exhaust temperature detected by the temperature detection means (32) is higher than a set temperature.
Description
BACKGROUND TECHNOLOGY[0001]The present invention relates to a hot water supply device, and more particularly relates to a hot water supply device that is endowed with a function of determining whether or not clogging by scale is taking place due to scale having been deposited inside heat exchange tubing of a heat exchanger.[0002]From the prior art, various hot water supply devices that utilize various sources of heat have been widespread in general household use, such as gas powered hot water supply devices, electrically powered hot water supply devices, and hot water supply devices that employ fuel oil and so on. In particular, a gas powered hot water supply device typically includes an air blower fan that intakes air for combustion from the exterior, a burner unit that mixes and combusts together the air for combustion and fuel gas, a heat exchanger that supplies heat to water by exchanging heat between the high temperature combustion gases and water flowing in a heat exchange tub...
Claims
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Patent Timeline
Login to View More IPC IPC(8): F28F27/00F24H1/14F24H8/00F28F19/00
CPCF28F27/00F24H8/00F24H1/145F28F19/00F28D7/087F28D21/0007F24H9/2035F28D7/1615F28F1/325Y02B30/00F24H15/395F24H15/421F24H15/345F24H15/36F24H15/235
InventorDOYAMA, MASATOKINUGASA, TOMOFUMIISHIKADO, MASAMITSUKUSAKABE, MAKOTO
OwnerNORITZ CORP