JPH01247949A - Hot water supplying device - Google Patents

Abstract

PURPOSE:To prevent the quantity of hot water supplied from being reduced to or below a water quantity for an extinguishing operation during an operation of a burner and prevent a hunting phenomenon of the burner from occurring, by automatically changing a preset temperature of supplied hot water to a fixed temperature when the quantity of hot water supplied reaches a predetermined constant value. CONSTITUTION:A controller 5 for controlling the ignition, extinguishment and combustion quantity of a burner 2 according to an output from a water quantity sensor 7 is provided with a supplied hot water temperature calculator 5d. When the signal from the sensor 7 is lowered to a predetermined value approximate to a water quantity for an extinguishing operation, a preset higher supplied hot water temperature Hsh is automatically lowered to a predetermined lower supplied hot water temperature Hsl by the calculator 5d, and the lowered temperature value is inputted to a combustion quantity calculator 5b. As a result, the temperature of hot water supplied from a heat exchanger 1 is lowered, and the burner 2 is prevented from being extinguished due to an increase in the quantity of hot water supplied by an operation of a hot water tap or the like. When the quantity of hot water supplied is increased to or above a predetermined quantity during an operation under the lower supplied hot water temperature Hsl, the hot water temperature calculator 5d automatically raise the temperature Hsl to the higher supplied hot water temperature Hsh, which is inputted to the combustion quantity calculator 5b, thereby switching the operation to a high-output operation.

Description

[Detailed Description of the Invention] (Field of Industrial Application) The present invention relates to the improvement of water heaters used in general homes, offices, factories, etc. This relates to a water heater that automatically moves up and down to a predetermined value to prevent the burner from causing the phenomenon of turning on or extinguishing.

(Prior art) Fig. 6 shows an example of combustion control in a conventional water heater. In one mouth, 1 is a heat exchanger, 2 is a burner,
3 is an ignition device, 4 is a fuel control valve, 5 is a controller, 6 is a hot water temperature setting device, 7 is a water flow sensor, 8 is a water temperature sensor, 9
is the water temperature sensor.

The point/extinguishing of the burner 2 is controlled by the point/extinguishing control device 15a in the controller 5, and when the amount of water flowing into the heat exchanger 1 exceeds the amount of water for ignition operation.

A combustion signal B is sent from the ignition/extinguishing control device @5a to the ignition device N3 and the fuel control valve 4, and the burner 2 is ignited. In addition, while the burner 2 is operating, the amount of hot water that comes out decreases, and the flow rate Q is set to a value that is larger than the minimum water discharge amount specified by the Japan Wooden Road Association (hereinafter referred to as "water flow rate") and is set to a value commensurate with the minimum capacity of the appliance. When the amount of water falls below (referred to as the extinguishing water amount), the burner extinguishing signal B' is transmitted from the point/extinguishing control device 5a, and combustion is stopped.

On the other hand, the combustion control of the burner 2 during hot water supply is controlled by the control device S.
This is performed by a combustion amount calculation device 15b and a combustion amount control device 15c. That is, water amount Q and water temperature W measured by water amount sensor 1, water temperature sensor 2, hot water temperature sensor 3, etc.
, using the hot water temperature T and the set hot water supply temperature Is, the combustion amount required to supply hot water at the set temperature Hs is calculated in the combustion amount calculating device 15b, and further, the combustion amount is controlled based on the calculated value. The opening and closing of the fuel control valve 4 is controlled by the device 5C.

By the way, in conventional water heaters, the hot water temperature Hs preset by the hot water temperature setting device 6 was always maintained at a constant temperature Hs during operation of the water heater, regardless of the amount of hot water supplied. It remains as it is. That is, since the set hot water supply temperature Hs is treated as an independent control element whose water volume is completely unrelated to the output of the water volume sensor 7,
If the set hot water temperature Is is set to a high temperature,
In order to obtain the appropriate temperature, the user operates the hot water outlet to reduce the amount of hot water supplied, or in the case of a thermomixing type hot water outlet, the same operation is performed automatically, so the fire is extinguished as the amount of hot water decreases. If the burner 2 is extinguished due to the amount of water being lower than the amount of water, or if a thermomixing hot water outlet is used, the burner 2 is repeatedly turned on and extinguished, resulting in a so-called hunting phenomenon.

Alternatively, for example, in a water heater using a thermomixing device 10 as shown in FIG.
5℃, and when the water temperature W is 25℃, if you try to dispense hot water with a hot water temperature T of 42℃ from the wet outlet 11 at a ratio of 51/in, the heat balance formula is 51/win x 42℃.
* 1.71 / Otori in x 75℃ + 3.3 fL
/sin 25°C, and the amount of hot water Q supplied from the heat exchanger 1 is reduced to below the extinguishing water amount Qs (usually 2 to 317 w1n), and as a result, the bar 2 is extinguished,
Continuous hot water supply becomes impossible.

Incidentally, in the above-mentioned case, in reality, as the hot water temperature H decreases due to extinguishing of the burner 2, the thermomixing device 11
0 increases the hot water supply amount Q, the burner 2 is re-ignited when it reaches the ignition water amount Qp (normally 2.5 to 3.517w1n), and the burner 2 is turned on and extinguished in the state shown in Fig. 8. A so-called hunting phenomenon occurs in which this process is repeated.

(Problems to be Solved by the Invention) The present invention solves the above-mentioned problems in conventional water heaters of this type, namely, the set water supply temperature is always maintained at a constant value regardless of changes in the amount of hot water supplied. Therefore, while the burner 2 is operating, the hot water supply amount Q frequently becomes less than the extinguishing water amount Qs, which causes the burner 2 to extinguish the fire and causes a hunting phenomenon. The present invention provides a water heater that is capable of extinguishing the burner 2 and preventing the hunting phenomenon by automatically raising or lowering the set hot water supply temperature Hs according to the temperature.

(Means for Solving the Problems) The present invention is applicable to conventional water heater control systems when the amount of hot water supplied Q reaches a predetermined constant value.

By automatically changing the predetermined hot water supply temperature Hs to a constant temperature, the hot water supply amount Q is prevented from falling below the extinguishing water amount Qs while the burner is operating, thereby preventing the so-called hunting phenomenon of the burner. The basic idea is to do so.

That is, the present invention includes: a heat exchanger 1; a burner 2 that heats the heat exchanger 1; a water flow sensor 7 that detects the amount of water flowing through the heat exchanger 1;・
A controller 5 that controls extinguishing and combustion amount; Hot water temperature Hs
In a water heater equipped with a hot water temperature setting device 6 for setting,
The controller 5 includes a hot water temperature calculation device! 5d is provided, and when the water quantity signal Q' from the water quantity sensor 7 reaches a certain value, the hot water temperature calculation device 5d automatically converts the set hot water supply temperature H+ to a predetermined value, and uses the converted set hot water temperature The basic structure of the invention is to control the amount of combustion.

(Function) When the water amount signal from the water amount sensor 7 drops to a predetermined value close to the extinguishing water amount Qs, the hot water temperature calculation device 5d of the controller 5 changes the preset high temperature hot water supply temperature Hsh to a predetermined low temperature. The lowered low temperature set hot water temperature Hs is automatically lowered to the set hot water temperature Hsl.
The energy consumption is input to the combustion amount calculation device 5b. As a result, the temperature of the hot water supplied from the heat exchanger 1 decreases, and as a result, the amount of hot water supplied increases and the burner 2 is prevented from being extinguished by the user's operation, a thermomixing device, or the operation of a tap tap.

Conversely, when the amount of hot water supplied exceeds a predetermined amount during operation at the low temperature set hot water supply temperature HsJL, the hot water supply temperature calculation device 5d of the controller 5 automatically increases the set temperature Hsl to the high temperature set hot water supply temperature Hsl. and inputs this to the combustion amount calculation device 5b. As a result, the hot water supply temperature of the heat exchanger 1 is increased, and the operation is switched to high output operation.

(Example) Embodiments of the present invention will be described below based on the drawings.

FIG. 1 is a control system diagram showing a first embodiment of the present invention,
The rest of the configuration except for the 5ft controller is the same as that of the water heater shown in FIG. 6 above. In FIG. 1, the same reference numbers are used for the same parts as in FIG. 6.

In this embodiment, the controller 5 is a fire extinguishing control device 5a.
, a combustion amount calculation device 5b, a combustion amount control device 5C, and a hot water temperature calculation device 15d. 1 unit of fire extinguishing control! 5a receives the water amount signal Q' from the water amount sensor 7, and when the water amount Q exceeds the ignition operating water amount Qp, a combustion signal B is sent.
is transmitted to the ignition bag M3 and the fuel control valve 4 to ignite the burner 2, and when the water amount Q decreases while the burner 2 is in operation and reaches the extinguishing water amount Qs, an extinguishing signal B' is transmitted and the burner 2 is ignited. is extinguished.

On the other hand, the water quantity signal Q' from the water quantity sensor 7 and the high-temperature setting hot water temperature signal Hsh from the hot water temperature setting device 6 are input to the hot water temperature calculation device 5d. are compared in the arithmetic unit 5d.

Now, the burner 2 is activated, and the amount of hot water supplied from the heat exchanger 1, that is, the water amount signal Q' is between the ignition operating water amount Qp and the first switching water amount Qo, which is slightly larger than this, as shown in FIG. In some cases, the high temperature setting hot water temperature signal Hsh' from the hot water temperature setting device 6 is automatically lowered to a relatively low predetermined low temperature setting signal Hsl', and this converted low temperature setting hot water temperature signal Hsl' is automatically reduced to a relatively low predetermined low temperature setting signal Hsl'. The signal Hsi' is input to the combustion amount calculation device 5b.

As the amount of hot water increases, the water amount signal Q' changes to the first switching water amount Q.
o, the low-temperature set water supply temperature Hs' is gradually increased, and when the water quantity signal Q' exceeds the steady water quantity Qn, the high-temperature set water supply temperature signal Hsh' from the hot water temperature setting device 6 is increased.
is the combustion amount calculation unit! 5b., and high temperature hot water is supplied.

Conversely, when the amount of hot water supply decreases while the burner 2 is operating, if the water amount Q reaches the second switching water amount Qr, which is slightly smaller than the steady water amount Qn, the high temperature setting hot water temperature signal Hsh
``is sequentially lowered by the hot water supply calculation device 15d, and when the water amount signal Q' reaches the ignition operating water amount Qp, it is automatically switched to the low temperature setting hot water temperature signal HsJl'', and this low temperature setting hot water temperature signal Hsl'' is used for the combustion amount calculation. device 5b
is input to. As a result, the extinguishing water amount Qs does not decrease even though the amount of hot water supplied increases, and extinguishing of the burner 2 is prevented.

In this embodiment, the high temperature setting hot water supply temperature Hsh is set to 7.
5℃, low temperature setting hot water temperature Hsl is 55℃, 1 ignition operating water amount Qp is 217sin, 1st switching water amount Qo is 3JL7's
in, steady water amount Qr is 51/win, second switching Qr is 4
The fire extinguishing water amount Qs is set to 1/win and 1.8 sentences/haze, respectively.

In the combustion amount calculation device 5b, the water amount signal Q'.

Water temperature signal W', hot water temperature signal H', and high/low set hot water temperature signal Hsh' from the hot water temperature calculation device 15d.

Hsi' is used to calculate the set hot water supply temperature Hsh and the combustion amount necessary to obtain hot water according to the Hs statement, and based on the calculated value, the opening and closing of the fuel control valve 4 is controlled by the combustion amount control device t5c. .

FIG. 3 shows a second embodiment of the present invention, and shows a water heater combined with a thermomixing device 10. In FIG.

In this embodiment, the hot water sensor on the outlet side of the heat exchanger l is omitted, and as a result, the combustion amount calculation device 5b detects the water amount signal Q', the water temperature signal W', and the high/low settings. The required combustion amount is calculated from the three signals, the hot water temperature signal 8th' and HtJL'.

Further, in one embodiment, the low temperature set hot water supply temperature Hs
It is desirable to select a temperature lower than the set temperature of the thermomixing device 10. In that case, it becomes possible to detect the total amount of hot water coming out from the infusion port 11 at low flow rates using the water amount sensor 7. As a result, it is possible to obtain a water heater with almost no variation in the amount of water used for lighting and extinguishing operations, even though the water heater has a built-in thermomixing valve.

As in the present invention, by automatically changing the set hot water supply temperature Hs according to the amount of water Q flowing through the heat exchanger 1, for example, the hot water temperature from the hot water outlet 11 of 42°C shown above is 5JL.
/+*in flow rate (feed water temperature W-25
℃), the heat balance is automatically set to 51/1n x 42℃
=2.81/layer 1nX55℃+2.2stand/@1nx25
℃, and the amount of water Q in heat exchanger 1 is automatically reduced to approximately 2.8 u.
/+*in, and is maintained at a value equal to or higher than the extinguishing water amount Qs.

As a result, the burner 2 does not repeatedly turn on and off like in conventional water heaters, and hot water is supplied stably in the state shown in FIG. 4.

In other words, according to the water heater of the present invention, as shown in the fifth factor, the required output PuJ, which cannot be obtained by keeping the set hot water supply temperature Hs at a high temperature, automatically changes the set hot water supply temperature Hs when the amount of hot water supply decreases. The output range in the low flow area (shaded area)
will be expanded.

(Effects of the Invention) As described above, in the present invention, by adding the hot water temperature calculating device 15d to the conventional water heater controller, the output Q' of the water flow sensor 7 and the set hot water temperature H from the hot water temperature setting device 6 can be calculated.
s, and when the output Q' of the water flow sensor 7 reaches a certain value, the set hot water supply temperature Hs is automatically converted to a predetermined temperature. Also, the amount of water flowing into the heat exchanger 1 hardly ever decreases below the extinguishing water amount Qs, and extinguishing of the burner 2 and the so-called hunting phenomenon are completely prevented.

Conversely, when the amount of hot water output increases, the set hot water supply temperature Hs is automatically returned to the original high temperature set hot water supply temperature Hsh, so that high temperature hot water can be quickly obtained.

As described above, according to the present invention, the output of the water heater can be widely utilized, and the present invention exhibits outstanding practical utility.

[Brief explanation of the drawing]

FIG. 1 is a control system diagram of a water heater according to a first embodiment of the present invention, and FIG. 2 is a diagram showing the relationship between the flow rate and the set hot water supply temperature. FIG. 3 is a control system diagram of a water heater according to a third embodiment of the present invention. FIGS. 4 and 5 are explanatory diagrams of the operating characteristics of the water heater according to the present invention. Figures 6 and 7 are control system diagrams of conventional water heaters,
FIG. 8 is an explanatory diagram of the burner hunting phenomenon in a conventional water heater. l Heat exchanger 2 Burner 3 Ignition device 4 Fuel control valve 5 Controller Sa Point/extinguishing control device 5b Combustion amount calculation device 5c Combustion amount calculation device 5d Hot water temperature calculation device 6 Hot water temperature setting device 7 Water amount sensor 8 Water temperature sensor 9 Hot water Temperature sensor 10 Thermomixing device 11 Bleeding port Q Water amount = hot water supply amount Qs Extinguishing water amount Qp Ignition activation water amount Q' Water amount signal B Combustion signal B' Extinguishing signal Hs Set hot water temperature Hsl Low temperature set hot water temperature W Water temperature Hsh High temperature set hot water temperature T Water temperature (hot water supply) Fig. 1 Fig. 5 mark ('c) ) ILI → Wind 1 (X/Ayare J
Figure 6

Claims (3)

[Claims] (1) A heat exchanger (1); a burner (2) that heats the heat exchanger (1); a water amount sensor (7) that detects the amount of water flowing through the heat exchanger (1); and a water amount sensor (7) In the water heater, the water heater is equipped with a controller (5) that controls the point, extinguishing, and combustion amount of the burner (2) with an output of; and a hot water temperature setting device (6) that sets the hot water temperature (Hs). The controller (5) is provided with a hot water temperature calculation device (5d), and when the water amount signal (Q') from the water distribution amount sensor (7) reaches a certain value, the hot water temperature calculation device (5d) determines the setting. A water heater characterized in that a hot water supply temperature (Hs) is automatically converted to a predetermined value, and a combustion amount is controlled based on the converted set hot water supply temperature. (2) The water heater according to claim 1, wherein the set hot water temperature (Hs) is automatically lowered to a predetermined value when the water amount signal (Q') decreases below a predetermined value. (3) A heat exchanger (1); a burner (2) that heats the heat exchanger (1); a water flow sensor (7) that detects the amount of water flowing through the heat exchanger (1); A controller (5) that controls the point, extinguishing, and combustion amount of the burner (2).
) and a hot water temperature setting device (6) that sets the hot water temperature (Hs).
); and a thermomixing device (10) that mixes hot water and water from the heat exchanger (1) and dispenses hot water, the controller (5) is equipped with a hot water temperature calculation device (5d). )
The hot water temperature calculation device (5d) automatically adjusts the set hot water temperature (Hs) to the thermomixing device (10) when the water amount signal (Q') from the water amount sensor (7) falls below a certain value. A water heater characterized in that the temperature is converted to a temperature lower than the set temperature of the water heater, and the amount of combustion is controlled based on the converted set water supply temperature.