JPS60252A - Hot water heating device - Google Patents

Abstract

PURPOSE:To reduce necessary cycle time upon discharging hot-water and stabilize discharging hot-water temperature by a method wherein the flow amount of the discharging hot-water and the temperature of inlet water are detected to determine the input timing of a heater in accordance with the flow amount and the inlet water temperature. CONSTITUTION:Water, reserved in a cistern tank 1, is pressurized by a pump 4 and is supplied into a hot-water reserving tank 6 through the water temperature detecting unit 14 while hot-water, reserved in the tank 6, is discharged from a nozzle 16 through the flow amount detecting unit 13. The input of the heater 8 is controlled by a control unit 15 so that the hot-water temperature in the tank 6 keeps a constant value by the hot-water temperature detecting unit 11. The flow amount of the discharging hot-water and the inlet water temperature become parameter for the input timing in case the input of the heater 8 is constant and the optimum timing is quickened when the flow amount is larger and the inlet water temperature is lower, whereby the cycle time in case of repeated discharge of hot-water may be reduced effectively.

Description

DETAILED DESCRIPTION OF THE INVENTION Field of the Invention The present invention relates to a hot water heating device having a heater at the bottom of a tank and employing a push-up method, and particularly to an improvement in the hot water dispensing characteristics during repeated dispensing.

Conventional configuration and its problems The reason why a hot water storage tank used in a hot water heating device uses a push-up method when hot water is dispensed is that there is little change in hot water temperature when hot water is dispensed, and hot water can be used at a high temperature.

An example of a conventional hot water heating device using this method will be explained with reference to FIG. The hot water storage tank 2o has a lid 21 airtightly attached to the upper end and a heater 22 for heating hot water at the bottom.The hot water storage tank 20 also has a hot water outlet pipe 23 that opens above the inside of the hot water storage tank 20 and leads hot water to the hot water storage tank. The tank 2o is provided with a water inlet pipe 24 that opens at the bottom inside the tank 2o and supplies pressurized water.

The operation of this conventional hot water heating device will be explained. The temperature of hot water in the hot water storage tank 2o is controlled by a thermometer 25 to maintain a constant value. Therefore, the temperature of the hot water in the hot water storage tank 2o is initially constant within a certain set temperature range. If pressurized water is supplied from the water inlet pipe 24 in this state, the hot water in the hot water storage tank 20 will be separated into two layers, a high temperature layer and a low temperature layer, and the high temperature water will be discharged from the hot water outlet pipe 23.

In this push-up type hot water heating device, the following problem occurred when a large amount of hot water was repeatedly dispensed.

The hot water in the hot water storage tank 2o is separated into a high-temperature layer and a low-temperature layer when hot water is dispensed, and when the low-temperature layer reaches the thermometer 26, the heater 22 is not heated, and even when the low-temperature layer reaches the thermometer 25, the heat capacity or measurement of the thermometer 25 is not performed. Due to the time delay in the system, it took more time for the heater 22 to actually start the heating operation.

For this reason, when a large amount of hot water is repeatedly dispensed, the cycle time required to obtain the required hot water temperature becomes long.

-1 When the hot water is tapped out for a long time, there is a temperature layer that is not heated at all in this conventional example, and the hot water temperature may suddenly drop after a certain point.Purpose of the InventionThe present invention is based on the conventional example. The present invention solves the problem and makes it possible to repeatedly dispense a large amount of hot water by appropriately setting the timing of inputting the heater during hot water dispensing. A means is provided for setting the timing for inputting the heater according to the flow rate and inlet water temperature.

With this configuration, the timing of heater input when hot water is tapped can be controlled according to the flow rate of hot water, which reduces the required cycle time when hot water is tapped, and further stabilizes the temperature of the hot water.

DESCRIPTION OF EMBODIMENTS An embodiment of the present invention will be described below with reference to FIGS. 2 and 3.

From the gas turbine tank 1 through the filter 2 and water supply channel 3,
It reaches a pump 4 driven by a variable speed motor (not shown), and then from the pump 4 through a water supply channel 5 to a hot water storage tank 6.
leading to. The hot water storage tank 6 has a lid γ airtightly attached to its two ends, and a heater 8 for heating hot water at its bottom. The hot water tank 6 also has a hot water outlet pipe 9 which opens at the upper part of the interior of the hot water storage tank 6 and introduces hot water, and an inlet pipe 10 which opens at the lower part of the interior of the hot water storage tank 6 and supplies pressurized water. A hot water temperature detecting section 11 for detecting the hot water temperature is airtightly attached to the lid 7. A hot water outlet path 12 is connected to the hot water outlet pipe 9, and a flow rate detection section 13 is provided in this hot water outlet path 12. '-1
At the tip of the water supply channel 6, there is a water temperature detection unit 14 that detects the temperature of the incoming water.
is provided. A control section 15 is provided that controls the timing of input to the heater 8 based on the incoming water temperature and outlet hot water flow rate obtained from these detection sections. The control unit 15 further controls the temperature of the stored hot water during heating of the stored hot water using input from the thermostat 11, and also controls the rotation speed of the pump 4.

Further, a nozzle 1θ is provided at the tip of the hot water outlet path 12.

The operation of the hot water heating tank with the above configuration will be explained. The water stored in the gas tank 1 is passed through the filter 2.
It passes through the water supply channel 3 and is sucked into the pump 4, and is pressurized by the pump 4 and then flows into the water supply channel 5. Water is supplied from the water inlet pipe 10 to the hot water storage tank 6 via the water temperature detection section 14 . The hot water stored in the hot water storage tank 6 is supplied to the hot water outlet pipe 9. Flow rate detection unit 13. The input to the heater 8 is controlled by the control unit 15 so that the hot water temperature in the hot water storage tank 6 from which hot water is spouted from the nozzle 16 via the hot water outlet path 12 is maintained at a constant value by the hot water temperature detection unit 11.

In this embodiment, an important point in reducing the cycle time when repeatedly dispensing a large amount of hot water is to optimize the timing of heater input. When the heater input is constant, the timing of this input is determined by the output flow rate and the input water temperature. The higher the flow rate and the lower the inlet water temperature, the earlier this optimal timing will be.

In this embodiment, the flow rate of the tapped water is detected by the flow rate detection unit 13.
The temperature of the incoming water is detected by the water temperature detection unit 14, and the control unit 15 controls the input timing of the heater 8 to match the optimal timing described above, so that the cycle time when repeatedly discharging hot water can be effectively reduced. can be reduced. In addition, since the timing of the input to the heater 8 is not delayed as in the conventional case, the temperature of the outlet water suddenly decreases from a certain point as shown in Fig. 3 (conventionally, it is a broken line; in this embodiment, it is a solid line). The problem can be improved.

Effects of the Invention As described above, the hot water heating tank according to the present invention provides the following effects.

(1) After hot water is discharged from the hot water tank, the heater can be turned on at the best timing according to the flow rate of the discharged hot water and the temperature of the input water, so the cycle time when hot water is repeatedly discharged can be effectively shortened.

(2) It is possible to improve the falling characteristic of the hot water temperature during continuous hot water dispensing.

[Brief explanation of the drawing]

Fig. 1 is a schematic sectional view of a shelf showing a hot water storage tank of a conventional hot water heating device, Fig. 2 is a configuration diagram of an embodiment of the present invention, and Fig. 3 is a characteristic diagram showing the hot water output characteristics. ... Hot water storage tank, 8 ... Heater, 9 ... Hot water outlet pipe,
1Q... Water inlet pipe, 11... Hot water temperature detection section, 13... Flow rate detection section, 14... Water temperature detection section, 15... Means (control unit) for setting the timing to input the heater. Fig. 1 2 Fig. 2 5 Fig. 3

Claims (1)

[Claims] A heater for heating hot water installed at the bottom of the hot water storage tank,
A hot water outlet pipe that communicates with the hot water storage tank and opens above the inside of the hot water storage tank, a water inlet pipe that opens inside the hot water storage tank below, and a hot water temperature control device that detects the hot water temperature inside the hot water storage tank. A detection unit, a flow rate detection unit that detects the flow rate passing through the hot water outlet pipe, and a water temperature detection unit that detects the temperature of water entering the water input pipe, and the temperature of the water detected by the flow rate detection unit is detected by the water temperature detection unit. A hot water heating device comprising means for setting the timing of inputting the heater according to the temperature of water entering the water.