JPH04155149A - Temperature control method of hot-water supply apparatus - Google Patents

Abstract

PURPOSE:To diminish the fluctuation in the hot-water temperature by a method wherein a water supply pipe and hot-water supply pipe of a heat exchanger are connected by a bypass pipe, a portion of supply water is fed into the hot-water supply pipe through the bypass pipe to reduce the flow rate of supply water to the heat exchanger to deliver the hot-water at a high temperature, and water is mixed with the high temperature water through the bypass pipe to produce hot water at an adequate temperature. CONSTITUTION:A water supply pipe 25 and a hot-water supply pipe 28 of a hot-water supply apparatus A are connected by a bypass pipe BP, and a solenoid on-off valve 35 is mounted on the bypass pipe BP. The solenoid on-off valve BP is opened during intermittent combustion control to bypass a portion of water flowing along the water supply pipe 25 to the hot-water supply pipe 28 through the bypass pipe BP, resulting in an reduction in the flow rate of supply water to a heat exchanger. At this time, the combustion rate of a gun type burner B is not changed, causing high-temperature water is delivered from the heat exchanger to the hot-water supply pipe 28. Water is supplied from the water supply pipe 25 to the hot-water supply pipe 28 through the bypass pipe BP, and water is mixed with high-temperature water flowing through the hot-water supply pipe 28, so that hot water at a adequate temperature can be produced. The temperature fluctuation of the adequate-temperature water can be diminished.

Description

[Detailed description of the invention] (b) Industrial application field The present invention relates to a combustion control method in a water heater.

(B) Prior Art Conventionally, as one type of water heater, there is an oil type water heater A shown in FIG.

The configuration of the petroleum water heater A will be explained with reference to the same figure.2
0 is a gun type burner with a return type pressure spray nozzle N inside, and the burner 2o has a Talito 2 at the rear.
It is connected to the fan 23 via 1.

A heat exchanger 24 is disposed below the gun type burner 20, and the water supply side of the heat exchanger 24 is connected to a water supply pipe 25, and a water flow sensor 26 is connected to the water supply pipe 25.
and a water temperature sensor 27 are attached.

On the other hand, a flow rate regulating valve 29 and a hot water temperature sensor 3o are attached to the hot water supply pipe 2 connected to the hot water supply side of the heat exchanger 24.

Further, a bath pipe 31 is branched from the hot water supply pipe 28, and a bath water amount sensor 32 and a shutoff valve 33 are attached to the bath pipe 31.

Next, the gun type burner B built into the oil water heater A.
To briefly explain the configuration of T, in FIG.
is an oil storage tank filled with kerosene. The kerosene that flows from the oil storage tank T through the filter F and falls into the oil pipe S is pressurized by the pump P and returns to the high pressure spray nozzle N.
will be supplied to

In addition, the return high-pressure spray nozzle N forms an internal C jetting flow path 10 and a return flow path 11, and a portion of the kerosene that has been completely supplied to the return high-pressure spray nozzle N through the outward oil pipe S is removed. The remaining kerosene is atomized and ejected from the opening part of the tip nozzle, and the remainder of the kerosene is returned to the return oil pipe R, which will be described later, through the return passage 11.

In the middle of the return oil pipe R, several flow rate adjustment valves F (, a filter F2, and a check valve G are installed in series).

In the petroleum-type hot water supply llA having such a configuration, the water supplied from the water supply pipe 2ξ to the heat exchanger 24 is heated by the combustion of the gun type burner B and becomes hot water, which is then sent to the desired hot water source via the hot water supply pipe 28. will be sent to.

) (c) Problem E that the invention seeks to solve
However, such oil-powered water heaters still have the following "
It had issues to solve.

That is, in FIG. 5, which shows the relative relationship between the amount of hot water discharged from the heat exchanger 24 to the hot water supply pipe 28 and the temperature of the hot water discharged, the shaded area indicates an output of 1500 kcal/h to 6000 kcal.
/h indicates that intermittent combustion control is performed.

By the way, as shown in the figure, the same 6000 kcal
/h1 However, in the case of high temperature hot water tap (point b), the hot water tap temperature has a small amplitude and is stable, whereas in the case of moderate temperature hot water tap (point a), the hot water tap temperature has a large amplitude, and the hot water source is "shower". In the case of devices, etc., it was supposed to cause discomfort to the user.

Furthermore, since the value detected by the temperature sensor becomes unstable, the combustion amount control based on the detected value also becomes inaccurate.

An object of the present invention is to provide a method for controlling the outlet temperature of hot water in a water heater and a combustion control method for a water heater, which can solve the above-mentioned problems.

(d) Means for Solving the Problems The present invention connects the water supply piping and the hot water supply piping, which are before and after the heat exchanger, through a bypass flow path, and when hot water is tapped in intermittent combustion control, a part of the water supply is routed through the bypass flow path. The amount of water supplied to the heat exchanger is reduced by bypass feeding the hot water to the hot water piping through the heat exchanger, and high temperature hot water is discharged from the heat exchanger to the hot water piping, and the bypass feed water is mixed with the high temperature hot water flowing through the hot water piping. The present invention relates to a sub-door method for controlling outlet temperature of hot water in a water heater, which is characterized in that water is produced at an appropriate temperature.

(E) Actions and Effects With the above-described configuration, the present invention provides the following actions and effects.

In the present invention, in particular, when obtaining hot water at a suitable temperature in intermittent combustion, a portion of the water supply is bypass-fed to the hot water supply piping through the bypass flow path.

Therefore, the amount of water supplied to the heat exchanger can be reduced, and high temperature hot water can be discharged from the heat exchanger to the hot water supply piping. after that,
Appropriate temperature water can be generated by mixing the bypass feed water with the hot water flowing through the hot water supply piping.

In this way, the temperature of the hot water discharged from the heat exchanger to the hot water supply pipe can be made high, so the amplitude of the hot water temperature can be reduced. Thereafter, by mixing the bypassed water with high-temperature water, suitable temperature water can be generated, and the temperature amplitude of the suitable hot water can be further reduced.

Therefore, stable water at an appropriate temperature can be supplied from the hot water source, so that water at an appropriate temperature can be comfortably used at each hot water supply amount.

Furthermore, since the detected value of the tapped water temperature by the temperature sensor is stable, the combustion amount can be controlled accurately based on the detected value.

(f) Examples The present invention will now be explained in detail based on examples shown in the accompanying drawings.

FIG. 1 conceptually shows the overall configuration of an oil-type water heater C that can be used in the method of controlling outlet temperature of hot water according to the present invention.

As shown in the figure, the petroleum type hot water supply @C has substantially the same configuration as the conventional petroleum type hot water supply IIA shown in FIG. 4, and the same configurations are indicated by the same reference numerals.

Substantially, the present invention connects the midway point of the water supply pipe 25 and the midway point of the hot water supply pipe 28 in a communicating state through the bypass flow path BP in the configuration of the petroleum water heater A, and the bypass flow path BP It is characterized by a configuration in which a value on/off valve 35 is provided in the middle.

Next, a combustion control method in the petroleum water heater having the above configuration will be explained.

First, 1500 kcal/h shown in Figure 2(a)
During intermittent combustion control up to 6000 kcal/h, the electromagnetic on-off valve 35 is opened and a portion of the water flowing through the water supply pipe 25 is bypass-fed to the hot water supply pipe 28 through the bypass passage BP.

Further, to explain in detail according to FIG. 2(b), data from the water amount sensor 26 and water temperature sensor 27 is read, and the amount of combustion in the gun type burner B is calculated from the data and the set temperature (41). It is necessary to judge whether the combustion amount is within the range of intermittent combustion control42), and if it is within the range of intermittent combustion control (42Y), whether the set temperature is high or not, that is, the predetermined threshold temperature χ°C It is determined whether or not the above is satisfied (43).

Therefore, if the set temperature is below the threshold temperature of 1°C (4
3Y), @value opening/closing valve 35 is opened.

This reduces the amount of water fed to the heat exchanger 24. At this time, since the amount of combustion generated by the gun type burner B does not change, high temperature hot water is discharged from the heat exchanger 24 to the hot water supply pipe 28.

However, since the hot water is hot, the temperature of the hot water is 3.
As shown in Figure (b), the amplitude H can be significantly reduced compared to the case where hot water is dispensed at an appropriate temperature without passing through the bypass flow path BP.

Furthermore, since water can flow from the water supply pipe 28 to the hot water supply pipe 28 through the bypass flow path BP, water can be mixed with the high temperature hot water flowing through the hot water supply pipe 28 to generate water at an appropriate temperature. , as shown in FIG. 3(c), the temperature amplitude H of the appropriately heated water can be further reduced.

Therefore, since stable water at an appropriate temperature can be supplied to the hot water outlet such as a shower, the user can comfortably use water at an appropriate temperature at each outlet light.

Furthermore, since the detected value of the outlet hot water temperature by the temperature sensor 30 is stable, the combustion amount can be controlled accurately based on the detected value.

゛In addition, 6000 kcal/h ~ 4 shown in Figure 2
Up to 0,000 kcal/h, proportional combustion control is performed by continuous operation of gun type burner B as in the conventional case.

Furthermore, the method for controlling the outlet temperature of hot water in a water heater according to the present invention is not limited to the oil water heater A having the configuration shown in FIG. It can also be applied to

[Brief explanation of drawings]

Fig. 1 is a conceptual diagram illustrating the configuration of an oil-based water heater to which the method of controlling the outlet temperature of hot water in a water heater according to the present invention can be applied;
Figure 2 (a) is a graph showing the combustion control method, Figure 2 (b) is a block diagram showing the control method of the electromagnetic on-off valve in the bypass flow path, Figure 3 is a graph showing the outlet hot water temperature, and the fourth diagram is the conventional one. FIG. 5 is an explanatory diagram of the block configuration of the water heater, and is an explanatory diagram of the state of outlet hot water temperature in intermittent combustion control. In the diagram, A: Petroleum water heater B: Gun type burner BP: Bypass flow path 24: Water supply pipe 25: Water supply pipe 28: Hot water supply pipe

Claims (1)

[Claims] 1. Connect the water supply piping and hot water supply piping that form the front and rear of the heat exchanger through a bypass flow path, and when tapping hot water in intermittent combustion control,
A portion of the supplied water is bypass-fed to the hot water piping through the bypass flow path to reduce the amount of water supplied to the heat exchanger, allowing high-temperature hot water to be discharged from the heat exchanger to the hot-water piping, and increasing the high-temperature water flowing through the hot-water piping. A method for controlling the outlet temperature of hot water in a water heater, characterized in that water at an appropriate temperature is generated by mixing bypass feed water with hot water.