JP2917420B2 - Water heater - Google Patents

Description

Description: BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an instantaneous hot water supply apparatus for gas or oil.

2. Description of the Related Art In recent years, hot water mixing devices have been provided in kitchens, washrooms, baths, and the like in homes so that hot water at an arbitrary temperature can be obtained by mixing hot water and water. Under such terminal conditions, the hot water supply heat source device is a hot water storage type boiler or a constant temperature hot water supply type instantaneous hot water supply device.

In this case, there is no problem with the hot water storage boiler, but the instantaneous refueling machine has a minimum required flow rate for ignition and digestion. May be digested. Conventionally, as this type of hot water supply device, when the amount of hot water is excessively reduced, it is determined whether or not the burner has been digested and the set value of the tapping temperature is corrected downward (for example, see Japanese Patent Application Laid-Open No. -161351).

Problems to be Solved by the Invention In such a conventional hot water supply apparatus, it is determined whether or not the burner of the water heater has been consumed during the tapping of the mixed hot and cold water, and then the set temperature is corrected downward. There was a problem that fluctuation occurred. In addition, there is a problem that the hot water supply tap is limited because the water supply mixer tap is built in the water heater main body.

An object of the present invention is to solve the above-mentioned problem, and an object of the present invention is to provide a hot-water supply device that stably supplies hot water from a hot-water mixer tap of a terminal that uses hot water.

Means for Solving the Problems In order to achieve the above-mentioned object, the present invention provides a hot water temperature controlling a combustion amount adjusting means for adjusting a combustion amount of a burner for heating a heat exchanger to a value set by a hot water temperature setting device. A control means and a tap water temperature correction control means for automatically correcting the set temperature of the hot water temperature setter according to the temperature detected by the feed water temperature sensor for detecting the temperature of the feed water flowing into the heat exchanger.

Operation The present invention corrects the hot water temperature in accordance with the temperature of the hot water flowing into the heat exchanger with the above-described configuration, and thus can avoid the digestion flow rate of the instant hot water heater in the hot water system using the hot water mixer tap.

Embodiment An embodiment of the present invention will be described below with reference to FIGS. 1, 2, and 3. FIG.

As shown in the figure, 1 is a hot water supply heat exchanger, 2 is a burner for heating the hot water supply heat exchanger 1, 3 is a combustion amount controller such as a proportional control valve for adjusting the combustion amount of the burner 2, and 4 is a hot water supply heat exchanger. Vessel 1
A hot water temperature sensor for detecting the temperature of hot water from the hot water and a water temperature sensor 5 for detecting an amount of water supplied to the hot water supply heat exchange 1 determine an ignition water amount and a digestion water amount to be an on / off signal for combustion and stop of the burner 2 based on the water flow amount. I do. Reference numeral 6 denotes a feed water temperature sensor for detecting the temperature of feed water to the hot water supply heat exchanger 1. Reference numeral 7 denotes a feedback control of the detected temperature of the hot water temperature sensor 4 to adjust the combustion amount so as to eliminate a deviation from the set temperature set by the temperature setting device 8. This is hot water temperature control means for adjusting the fuel in the heater 3, and the control side is a known feedback control using PID. 9 is a tap water temperature correction control means for correcting the set hot water temperature in accordance with the water temperature detected by the water temperature sensor 6, and 10 is an instantaneous water heater having the above-described configuration, and a hot water mixing tap of a hot water terminal via a hot water pipe 11.
Connect to 12. The hot water mixer tap 12 is connected to the hot water pipe 11 and the water pipe 13 and adjusts the temperature according to the intended use.

Normally, when the hot and cold water mixing tap 12 is used as the hot water supply terminal, the tapping temperature of the instantaneous hot water supply device 10 is set to a high temperature (60 to 80 ° C.) and fixed. Assuming hot water usage in ordinary households, use of showers in washrooms, kitchens, and baths is 37
℃-43 ℃ is the main operating temperature range.

The hot and cold water mixing system is represented by {(hot water temperature x hot water supply amount) + (hot water temperature x hot water volume)} = (mixed hot water temperature x mixed hot water volume).

When mixing hot and cold water, the most severe condition for the instantaneous water heater is when the temperature of hot water is high in summer.

For example, in the case of the use conditions shown in Table 1, Tap water temperature is high in summer and the amount of hot water in the kitchen is 5 /
If the temperature is set to a value of 70 ° C when the temperature of the instantaneous water heater is fixed at a value of 70 ° C when the temperature is set at about 37 ° C, which is lukewarm, the amount of hot water discharged from the water heater is reduced to about 1.3 / minute, which may cause digestion. Although the amount of digested water depends on the minimum combustion performance of the water heater, it is currently about 2 / min or more.

Hot water temperature correction control means 9 automatically lowers the set temperature of the instantaneous water heater when the water supply temperature rises.
Figure 3 is an illustration of its control characteristics, water on the horizontal axis the temperature T _i, the moment on the vertical axis and taking the hot water Q _L out and the set temperature T _s of the water heater, when fixing the set temperature T _s Although the hot water amount Q _L would Shitamawa' digestion water Qoff as shown in solid lines, hot water Q _L is digested water Qoff out with correcting the set temperature T _s of the instantaneous water heater according to the water temperature T _i as indicated by a broken line Can be avoided.
This correction may be proportional to the feed water temperature T _{i or} may be a threshold value correction.

FIG. 2 shows the selection of the above-described automatic correction mode and the case where a high hot water temperature is required for the temperature setting device 8, and the automatic correction mode switch 8a if the hot water supply use temperature range of 37 ° C. to 43 ° C. is assumed. The high-temperature mode switch 8b is selected only when a high hot water temperature is absolutely necessary. The high temperature mode is about 70 ° C, and the automatic correction mode is 70 ° C to 50 ° C.
If the temperature is set to about ℃, it is possible to mix and discharge hot water at 43 ℃.

As described above, according to the hot water supply apparatus of the embodiment of the present invention, the range of use of the hot water supply system using the hot water mixing tap by the instantaneous water heater provided with the means for automatically correcting the outlet water temperature according to the water supply temperature is expanded. And the usability can be improved throughout the four seasons.

[Brief description of the drawings]

FIG. 1 is a functional configuration diagram of a hot water supply apparatus according to one embodiment of the present invention, FIG. 2 is an external view of the hot water temperature setting device, and FIG. 3 is a control characteristic diagram of the hot water temperature correction control means. 1 ... heat exchanger, 2 ... burner, 3 ... combustion amount controller,
6 ... supply water temperature sensor, 7 ... hot water temperature control means, 8 ... hot water temperature setting device, 9 ... hot water temperature correction control means.

────────────────────────────────────────────────── ─── Continuation of the front page (72) Inventor Hiroshi Fujieda 1006 Kazuma Kadoma, Kadoma City, Osaka Prefecture Matsushita Electric Industrial Co., Ltd. (56) References JP-A-63-311041 (JP, A) (58) Investigated Field (Int.Cl. ⁶ , DB name) F24H 1/10 301

Claims (1)

(57) [Claims] 1. A heat exchanger, a burner for heating the heat exchanger, a combustion amount controller for varying a combustion amount of the burner,
A hot water temperature setter for setting the outlet temperature of the heat exchanger, a hot water temperature control means for controlling a combustion amount controller to attain the hot water temperature set point, and detecting a temperature of feed water flowing into the heat exchanger. A water supply temperature sensor and a water / water mixer tap connected to a hot water supply terminal are provided, and the water temperature setting device is configured to set the temperature to a high temperature mode in which a set temperature is set higher and to detect the temperature of the water / water mixer tap according to the detection temperature of the water supply temperature sensor. A hot water supply device that selects a hot water temperature correction control mode that automatically corrects a hot water side supply amount so as not to be the fire extinguishing water amount.