JPS59119113A - Hot water feeder - Google Patents

Abstract

PURPOSE:To reduce variation of the minimum ignition water level due to variance in component parts by detecting the actual temperature of fed water in stead of an assumed temperature thereof to set the minimum ignition water level according to the water temperature. CONSTITUTION:The minimum ignition water level is computed with an ignition water level computing section 18 according to a signal of a fed water temperature detector 15 and a signal from a heating capacity memory section 17 and when the signal from a flow rate detector 14 is higher than the results of the computation, a signal for starting combustion is sent to a heating controller 12 from a heater driving section 19 and a heat exchanger 9 is heated with a heater 13 to feed a hot water. When the capacity is altered by several stages with the heat controller 12, an alteration signal is transmitted to the heating capacity memory section 17 and a recomputation is done based on the signal from the heating capacity memory section 17 and the signal of the flow rate detector 14. Moreover, the capacity memory section 17 is exchangeable to enable common use of the control section 16 in the production of a hot water feeder different in the heating capacity.

Description

DETAILED DESCRIPTION OF THE INVENTION Field of Industrial Application The present invention attempts to control the opening and closing of combustion by calculating the minimum ignition water amount of an instantaneous water heater from the water temperature and heating capacity.

Conventional Structure and Problems Conventionally, the minimum amount of water to be ignited in a water heater is determined by the relationship between the capacity of the heating device and the maximum input water temperature, and is set to provide an output temperature within a range that does not normally boil. For example, assuming that the high water temperature in summer is '1z30c, the temperature of the hot water coming out of the trowel is kept below 95°C.

An example of a conventional example of these ignition water setting means is shown in Fig. 1.
lc. 4<fri The water enters the hydraulic response device 2 from the inflow path 1, passes through the heat exchanger 9, and is supplied to the outside from the outlet pipe 10. At this time, the water passes through the P/Turi sound 66, and a high pressure chamber 3 and a low pressure chamber 4 are created in front and behind the diaphragm 5 due to the Venturi effect. This pressure difference is used to send a mechanical or electrical signal to the heating controller 12 using the hydraulic response rod 8, which causes the heating device 13 to start combustion. It is a well-known technology that the amount of water is determined by the settings of the components of the hydraulic response device 2 and the connection means with the heating controller. When the amount of ignition water falls below the minimum ignition water amount, the pressure difference between the high pressure chamber 3 and the low pressure chamber 4 becomes small and is pushed back by the spring 7, the signal to the heating controller 12 is stopped, and combustion is stopped.

As mentioned above, in the conventional example, the minimum ignition water amount is determined by the connection means between the components of the hydraulic response device 2 and the heating controller 12, and the minimum ignition water amount varies depending on the machining accuracy of the component parts. There were drawbacks. In addition, as mentioned at the beginning, the minimum ignition water amount is set assuming a high inlet water temperature in summer, so it is inevitably set to Vcl. In this case, there was also the disadvantage that pressure from the water side was applied to the hot water side, reducing the amount of hot water and causing only water to be supplied.

OBJECTS OF THE INVENTION The present invention aims to eliminate such drawbacks, and one is to detect the actual incoming water temperature, not the assumed incoming water temperature, and set the minimum ignition water amount according to the water temperature, thereby providing comfortable hot water. Another purpose is to completely reduce the variation in minimum ignition water amount due to variation in LD components.

Structure of the Invention The present invention uses water for the above purpose. Detects Jmk, calculates the required minimum amount of ignition water from the heating capacity, and starts and stops combustion + h
It is something to be produced.

Example A practical example of the present invention is shown in FIG. 2 and FIG. 3 below.

Water 1d enters the flow rate detection device 14 from the inlet path 1, passes through the heat exchanger 9, and is supplied to the outside from the outlet pipe 10.

As an example of the configuration of the flow rate detection device 14, the permanent magnetic body 14b installed on the impeller 14a is rotated by the flow of water, so that the magnetic resistance element 14C captures the magnetic change.
It is already known that the rotation speed can be detected as a pulse signal, and the rotation speed has linear characteristics with respect to the flow rate. Therefore, by measuring the total number of pulses of the pulse signal, the total flow rate can be determined.

Next, the operation will be explained according to the control block diagram shown in FIG. Based on the signal sent from the inlet water temperature detector 15 and the signal from the heating capacity recording section 17, the ignition water amount calculation section 18 calculates the minimum ignition water amount, and the signal sent from the flow rate detection device 14 is calculated. If the temperature is high, the heating device drive unit 19 sends a signal to start combustion to the heating controller 12, and the heating device 13 heats the heat exchanger 9 and taps the hot water.

When the capacity of the heating controller 12 is changed to multiple levels, the change signal is transmitted to the heating capacity storage unit 17, and the calculation is performed again using the signal from the heating capacity storage unit 1A and the signal from the water temperature detector 14. This is what we do. Furthermore, the capacity storage section 17 is replaceable, and even when water heaters with different heating capacities are manufactured, the control section 16 can be shared by simply replacing the capacity storage section 17.

Effects of the Invention As described above, the present invention calculates the minimum ignition water amount from the water temperature and heating capacity, and can accurately detect the entire amount of water. This makes it possible to supply stable hot water.1
fc, the amount of water can be captured constant-electrically, so it is possible to reduce large changes in the minimum ignition water amount, such as the variation in the minimum ignition water amount due to variations in component parts, such as in dormitory automatic water pressure equipment.

Furthermore, since the capacity storage section is replaceable, the control section can be used for general purposes even if the heating capacity is different.

Furthermore, by changing the total number of ignition water according to VrC water temperature 1ftC, 4 (warm! ηira ?hA
It is also an effect of the present invention that the following can be obtained.

[Brief explanation of the drawing]

FIG. 1 is a configuration diagram showing a conventional water heater, FIG. 2 is a configuration diagram of a water heater according to an embodiment of the present invention, and FIG. 3 is a control block diagram showing the operation of the water heater. 2...Hydraulic response device, 9...Heat exchanger, 11
...Gas introduction path, 12...Heating controller,
13...Heating device, 14...Flow rate detection device, 15...Incoming water temperature detector, 16...
・Control unit, 17... Heating capacity storage unit, 18...
... Ignition water amount calculation section, 19... Heating device drive section. Name of agent: Patent attorney Sano Nakao and 1 other person No. 1
figure

Claims (1)

[Claims] (1) A flow rate detection device, a heat exchanger connected to the flow rate detection device, a heating device for the heat exchanger, a heating controller for controlling the heating device, and a heating controller provided on the inlet side of the heat exchanger. and a control unit that operates a heating controller based on the signals from the water inflow temperature detector and the flow rate detection device, and determines the minimum ignition water amount based on the signal from the water inflow temperature sensor and the capacity of the heating device. When the signal of the flow rate detection device reaches Φ (the calculated minimum ignition water amount), a signal is sent to the heating controller to start full combustion of the heating device. The water heater according to claim 1, wherein the water heater has a plurality of stages of capacity setting means, and the control unit calculates the minimum amount of ignition water according to each capacity. The water heater according to claim 1, having a device capacity storage section.