JPS6053740A - Hot-water heater - Google Patents

Abstract

PURPOSE:To improve a performance to maintain outlet hot-water temperature and prevent to discharge hot-water of abnormally high temperature by controlling a heater input by the discharging amount of hot-water and the temperature of entering water in the hot-water heater equipped with push-up type hot-water reserving tank. CONSTITUTION:The flow amount Q and the temperature Ti of water which enters through a water intake pipe 6 are detected respectively by sensors 16, 17 and signals from these sensors are inputted into a heater input control unit 18. The heater input control unit 18 controls the input of the heater 4 so that a difference between the entering water temperature Ti and the preset hot-water temperature Tc becomes equal or larger than a temperature increase Q/P, determined by the input P of the heater 4 and the amount Q of entering water. According to this method, the temperature of hot-water in the hot-water reserving tank 1 will never become higher than the preset temperature and may be held in the proximity of the preset temperature at all times.

Description

DETAILED DESCRIPTION OF THE INVENTION Field of the Invention The present invention relates to an improvement in hot water temperature control of a hot water heating apparatus equipped with a push-in type hot water storage tank.

The configuration of the conventional example and its problems i) What is this kind of thing like before? The hot water tank used in the i17 water heating device is equipped with a temperature detection section inside the hot water storage tank.
Electrical input to the heater is controlled so that the temperature of the water in the storage tank 61 remains constant. In addition, water is supplied from below the hot water storage tank, and hot water is pushed up from the bottom of the tank.
It is designed to make the most efficient use of hot water that has been heated to a certain temperature.

Although this method can control the temperature of the hot water tank with sufficient accuracy, the following problems occur during hot water dispensing operation.

3.1) Problem of running out of hot water The temperature detection unit installed inside the hot water storage tank is generally installed at a height around the middle of the hot water storage tank to detect the average value of the hot water temperature in the hot water storage tank. Until the low-temperature fluid layer formed by water flowing from below the hot water storage tank reaches the temperature detection section, the heater is not energized and a low-temperature fluid layer is formed inside the hot water storage tank. FIG. 1 shows typical hot water discharge characteristics of this conventional hot water heating device. In the figure, the solid line is the hot water temperature, and the broken line is the heater electrical input. In area A where hot water initially stored in the hot water storage tank is dispensed, hot water is dispensed at a set temperature T1. On the other hand, since the heater is energized after a considerable time has elapsed after the start of heating, two low-temperature layers are formed, and hot water runs out (low-temperature water comes out) as shown in area B.

2) Generation of high temperature water This problem occurs when the flow rate at the time of hot water discharge is low and the temperature of the water entering is high. When the heater is energized when hot water is dispensed, the water supplied to the hot water storage tank transfers to one side of the hot water storage tank 1 while exchanging heat with the other heater. At this time, the temperature of the water after heat exchange -1-shore is the electric input of the heater, the flow 111 and the water a11
(Determined by , it can get quite hot if there are few flow meters and the water temperature is high.

For example, the summer water intake is 30 degrees Celsius, and the flow rate is 0.6 tons/
m, Heater City: When the power is 0.85, the water temperature after heat exchange with the heater reaches 50 degrees Celsius. FIG. 2 shows an example of hot water discharge characteristics under these conditions. After the hot water tap is temporarily stopped, the hot water temperature rises significantly. This is because the hot water heated to 50°C after heat exchange in the heat exchanger is stored in the tank due to the l'Y force.

Problem 1: In order to solve the previous problem of drying out of the field, we need to improve the human timing of the printer! ? If you take steps to make
Low? 1llj Since the temperature cannot be expected to be alleviated by the water of 11\1, it is even more difficult! It becomes self-carrying.

The present invention solves such conventional problems, and maintains the set hot water temperature during long periods of use, and prevents the generation of abnormally high temperature water.
1 target.

5-Based Structure of the Invention In order to achieve this object, the present invention controls the heater input at the time of hot water tapping according to the hot water flow rate and the incoming water temperature.
With this configuration, the temperature rise due to heat exchange between the water supplied to the hot water storage tank and the heater when hot water is dispensed is controlled to an optimum value.

DESCRIPTION OF EMBODIMENTS An embodiment in which the hot water heating device according to the present invention is applied to a device for washing the human body will be described below with reference to FIGS. 3 to 5. In Fig. 3, the hot water storage tank 1 is formed by airtightly integrating the tank body 2 and the tank lid 3.
A heater 4 fixed to reach the bottom of the hot water storage tank 1, a hot water outlet pipe 5 that opens at the top of the hot water storage tank 1, a water inlet pipe 6 that opens at the bottom of the hot water storage tank 1, and a hot water temperature detection section 7 that detects the temperature of hot water in the hot water storage tank 1. is the provision. The hot water temperature detected by the hot water temperature detection section 7 is input to a temperature control section 8 and controls the electric input P of the heater 4 so that the temperature reaches the set temperature Tc.

The water supply source 9 is a water pipe that supplies pressurized water (page 106)]
It consists of a pressure reducing inverse valve 11 and a water supply channel 12 to supply water to the water inlet pipe 6. The flow control is carried out by the flow control valve 13 inserted into the water supply channel 12 between the pressure reduction reverse valve 11 and the water inlet pipe 6. The hot water flowing out from the hot water pipe 5 passes through the spout flow path 14, reaches the spout section 15, and is spouted to the human body.

The flow rate Q and water temperature Ti of water flowing in from the water inlet pipe 6 are detected by the flow rate sensor 16 provided in the water inlet channel 12 and the i! l
The temperature difference TcO between the temperature Ti of the water flowing in from the water inlet flow path 12 and the hot water temperature Tc Ti is determined by the temperature rise Q determined by the input P of the heater 4 and the flow 10 flowing in from the water inlet pipe 6. A heater input control section 1 is provided to limit the electric input P to the heater 4 so that /P satisfies Tc-Ti≧Q/P.

The reason why the heater input P is controlled to satisfy Tc-Ti>Q/P is that when the water flowing in from the water inlet pipe 6 is heated by the heater 4 and reaches a temperature of Tl + Q/P, Tc>
This is to satisfy Ti0o/P and to generate hot water with a temperature higher than the set temperature Tc inside the hot water storage tank 1. The temperature inside the hot water storage tank 1 is higher than the set temperature Tc.
If hot water is dispensed under conditions that generate hot water, the hot water temperature detection unit detects this high-temperature hot water, and a considerable amount of this high-temperature hot water is generated, and the next time the hot water is dispensed, this high temperature will be
However, according to this embodiment, electric power P to the heater 4 is Tc - Ti
) Q/P ff: The electric power P is controlled by the heater input control section 17 so as to be satisfied, and hot water with a temperature higher than the set temperature Tc is not generated under any conditions. FIG. 4 shows an example in which this control is applied to a heater having a capacitance of IKIV.

Further, in this embodiment, the heater 4 is arranged so that the temperature distribution of the hot water after heat exchange with the water flowing through the water inlet pipe 6 is uniform.
It is desirable that the heat generating portion of the heater 4 is uniformly distributed over the cross section of the hot water storage tank 1.

An example of hot water tapping characteristics according to this embodiment is shown in FIG.

Since the heater input P is controlled to the upper limit value determined by the incoming water temperature Ti and the flow rate Q, there is a problem that high temperature water is generated even if the input to the heater 4 is performed at the same time as the start of hot water dispensing.
Therefore, you can get a very good solution to the problem of running out of hot water.

Another embodiment of the indeterminate light will be explained using FIG. 6. This embodiment differs from the previously described embodiment in that the water supply source is a water storage tank and a positive displacement pump, and the flow IHt is detected by the flow sensor based on the rotation speed of this pump. Regarding this point, y15 will be explained. (For the same part 4, the same part'
7j- is attached. ) In FIG. 6, the water supply source 9a consists of a water storage tank 19, a positive displacement pump 20, and a suction channel 21 that communicates the water storage tank 19 with the suction 1120a of the positive displacement pump 20. The water pressurized by the positive displacement pump 20 is supplied to the hot water storage tank 1 through the discharge IN 20 b and the water supply channel 12 . The pump rotation speed of the positive displacement pump 20 is controlled by a rotation speed control section 22 to a predetermined 1Ile.
fit: is set. The control signal for this pump rotation speed is 0.
, is used in place of the flow signal of the flow 111 sensor 16 of the previous embodiment. The configuration and operation other than those described above are the same as those of the previous embodiment.

9 vanes According to the configuration of this embodiment, in addition to the effects described in the previous embodiment, since there is no need to use a flow rate sensor, the configuration is not a simplification, and manufacturing costs can be reduced. be.

Effects of the Invention The hot water heating device according to the present invention adjusts the electric power P to Tc-Ti≧ according to the temperature Ti, flow rate Q, and set temperature Tc of the water flowing in from the heater's electric power PL water inlet pipe during hot water supply operation.
Since the water is controlled to be Q/P, hot water with a temperature higher than the set temperature Tc will not be generated in the hot water storage tank. Therefore, the dangerous situation of abnormally high hot water being dispensed does not occur, and the heater input for dispensing hot water can be set at the same time as the start of dispensing, which is effective as a means for improving hot water running out.

[Brief explanation of drawings]

Fig. 1 is an operating characteristic diagram showing the hot water dispensing characteristics (out-of-water state) of a conventional hot water heating device, Fig. 2 is an operating characteristic diagram showing the hot water dispensing characteristics (abnormally high temperature dispensing) of the same device, and Fig. 3 is an operating characteristic diagram showing the hot water dispensing characteristics (abnormally high temperature dispensing) of the conventional hot water heating device. System configuration diagram showing one embodiment, p. 10]F Fig. 4 is an operation fQ diagram showing the control operation of the electric input to the heater according to the present invention, and Fig. 5 shows the hot water output characteristics of the hot water heating device according to the present invention. FIG. 6 is a system configuration diagram showing an embodiment of the present invention. 1... Hot water storage tank, 4... Heater, 5
...Hot water outlet pipe, 6...Water inlet pipe, 7...
... Hot water temperature detection section, 8... Hot water temperature control section, 9, 9
a...Water supply source, 17...Means for detecting flow [11] flowing in from the water inlet pipe, 16...Temperature sensor, 18...Heater input control Part, 19...
...Water tank, 20a...Intake port, 20
b...For discharge, 1.20...Displacement pump, 22...Rotation speed control section.

Claims (1)

[Claims] (1) A heater for heating hot water installed at the bottom of the hot water storage tank, a hot water outlet pipe that opens at the top of the hot water storage tank, a water inlet pipe that opens at the bottom of the hot water storage tank, and the temperature of the hot water in the hot water storage tank are detected. a hot water temperature detecting unit that controls the electric power P of the heater so that the hot water temperature detecting unit of the hot water temperature detecting unit reaches a set temperature Tc; a temperature sensor for detecting the flow rate Q passing through the water inlet pipe; and a means for detecting the flow rate Q passing through the water inlet pipe; The input p' of the heater is set so that the temperature rise Q/P of the water flowing in due to the inflowing flow rate Q is greater than or equal to, that is, Tc-Ti≧Q/P.
4. A hot water heating device equipped with a heater input control section that limits the temperature. (The two water supply sources are the water storage tank and the inlet is this water storage tank 210.
25 The means for detecting the flow passing through the water inlet pipe consists of a variable speed positive displacement pump whose discharge port 11 is connected to the water inlet pipe, and the means for detecting the flow passing through the water inlet pipe is configured to detect the rotational speed of this positive displacement pump. The hot water heating device according to claim 1, which is a rotation speed control section.