JPH0694249A - Automatic water filling device for hot water heating system - Google Patents

Abstract

PURPOSE:To save a time for judgment in a water feeding operation by a method wherein a standard for judgement in easiness of removing air in a system in reference to a variation in operating interval of a water supplying control valve during a water feeding operation is made and the operating time interval of the water supplying control valve is checked against the standard. CONSTITUTION:An operating time interval of a water supplying control valve 8 driven for supplying water into a hot water tank 2 is measured by a time measuring part 11, stored and a judging time until a third water supplying operation is carried out is applied as a predetermined set time. At an operation subsequent to a fourth operation, it is judged that an inside part of the system is set to be easily discharged with air under a high difference in time interval by a judging time calculation part 13 on the basis of a previous water supplying time interval and a time interval for judgement at a water supplying completion discriminating part 12 is set short. In turn, in the case that there is a small time interval measured by the time measuring part 11 and stored, its subsequent time interval is set long. With such an arrangement, it is possible to make a substantial reduction in the water supplying time.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an automatic water filling device in a hot water heating system.

[0002]

2. Description of the Related Art A hot water heating system is newly installed,
Once the water is drained from the system, it is necessary to drain the air from the system (fill the system with water). If the air is not drained sufficiently, the circulation pump will idle. Therefore, conventionally, a device that automatically determines whether or not the air is completely removed is used. Figure 3
In this conventional example, 1 is a heat source device, 2 is a hot water tank, 3 is a heat exchanger, 4 is a circulation pump, 5 is a hot water pipe, 6 is a terminal device, and 7 is a water level detector installed in the hot water tank 2. Then, the low water level detection sensor 7a and the high water level detection sensor 7
b is attached. 8 is a water supply control valve attached to the water supply 8a connected to the hot water tank 2, 9 is an automatic water supply control circuit (water filling device), and this control circuit 9 is based on the input from the water level detector 7. Water supply control valve 8
The control unit 10 controls the water supply control valve 8, the time measurement unit 11 that measures the drive time interval of the water supply control valve 8, and the water filling completion determination unit 12, and the automatic water filling is performed in the following procedure.

First, the hot water tank 2 is filled with water, and the circulation pump 4 is driven to fill one terminal 6 in the system and the hot water pipe 5 with water. In this state, the amount of water in the warm water tank 2 is monitored by the water level detector 7, and when the water amount becomes a certain amount or less, the time until the water supply control valve 8 is opened again and water is supplied is measured. When the time interval exceeds a certain value, it is determined that the air has completely escaped, the process is moved to the next terminal, and the determination is performed by the same method.

[0004]

However, in the case of the above-mentioned conventional automatic water filling device, all the standard water supply time intervals are the same, and when there is no water supply within this time, it is judged that the water filling is completed. Therefore, there are the following problems. a. The position and distance of the terminal device 6 are different from each other. For example, the terminal device 6 close to the heat source device 1, the terminal device 6 far from the heat source device 1, or the terminal devices 6 installed on the first floor and the second floor all have different installation conditions, but do not complete the water filling until a certain time elapses. It is judged as a thing. Therefore, the determination takes time. b. Since the water filling of the terminal device 6 is performed after the valve of the circulation path of the terminal device 6 is opened, it is necessary to set the reference time interval including the valve operating time. However, it is not necessary to include the valve operating time once the valve has operated,
It is not necessary to wait the same time, but in the case of the conventional example, it is waiting, and this takes time.

It is an object of the present invention to provide an automatic water filling device which does not take time to judge the water filling.

[0006]

The structure of the automatic water filling device according to the present invention is as follows.

In the hot water heating system, the hot water generated in the heat source device is circulated in the radiator for heating, and the returned hot water is returned to the heat source device via the hot water tank. The hot water tank has a water supply control valve. Connect the water supply line, and further install a water level detector that detects low and high water levels in this hot water tank, remove air from the system while driving the circulation pump, and supply water when the water level detector detects a low water level. Water is supplied to the water level until it reaches a high water level by driving the control valve, and when the water supply time interval exceeds a certain time, it is judged that the water filling is completed. The interval is measured and stored, and the judgment time until the third water supply is set to a preset time. After the fourth time, if the difference from the previous water supply time interval is greater than a certain value, Determined set a short time interval, an automatic water filling apparatus in hot water heating system, characterized in that a determination time calculation circuit for setting a long determination time interval when the difference between the time interval is below a certain value after.

[0008]

First, the hot water tank is filled with water, and the circulation pump is driven to circulate the water in one terminal unit in the system and in the hot water pipe. Then, in this state, the water level detector monitors the water reduction in the hot water tank, measures and stores the water supply time interval each time, and the determination time until the third water supply is set to a preset time, After the 4th time, if the difference from the previous water supply time interval is larger than a certain value, set the subsequent judgment time interval short, and if the time interval difference is less than a certain value, increase the judgment time interval. Calculation is performed by the determination time calculation circuit, and completion of water filling is determined based on the calculated value.

[0009]

EXAMPLE FIG. 1 shows an example of the present invention.

1 is a heat source device, 2 is a hot water tank, 3 is a heat exchanger, 4 is a circulation pump, 5 is a hot water pipe, 6 is a terminal device, and 7 is a water level detector installed in the hot water tank 2, A low water level detection sensor 7a and a high water level detection sensor 7b are attached. 8 is a water supply control valve attached to the water supply 8a connected to the hot water tank 2, 9 is an automatic water supply control circuit (automatic water filling device), and this control circuit 9 is based on the input from the water level detector 7. The control unit 10 for controlling the water supply control valve 8 by means of the above, a time measuring unit 11 for measuring the drive time interval of the water supply control valve 8, a water filling completion judging unit 12, and a judgment time calculating unit 13.

In the case of the above-mentioned embodiment, the water in the hot water tank 2 is circulated in the system of one terminal device 6 using the circulation pump 4, and then driven to supply water into the hot water tank 2. The operation interval of the water supply control valve 8 is measured and stored by the time measuring unit 11, and the determination time until the third water supply is performed is a preset time, and the difference from the previous water supply time interval is the fourth time and thereafter. On the basis of this, when the difference in the intervals is large, the determination time calculation unit 13 determines that air is likely to escape from the system, and sets the determination reference time interval of the water filling completion determination unit 12 to be short. On the other hand, when the difference between the time intervals measured and stored by the time measuring unit 11 is small, the determination time calculating unit 13 determines that the air in the system is unlikely to escape, and sets the subsequent time intervals to be long. The water filling completion determination unit 12 determines the completion of water filling based on this reference time interval.

[0012]

As described above, the present invention judges the easiness of the escape of air in the system under water filling from the change of the operation interval of the water supply control valve at the time of water filling, and the judgment criterion is based on this judgment. By making this and comparing the operation time intervals of the water supply control valve, it is possible to perform water filling suitable for the installation condition of each terminal device. Therefore, the water filling time can be greatly shortened as compared with the conventional example in which the time interval is determined at a constant rate for the determination.

[Brief description of drawings]

FIG. 1 is an explanatory view of an automatic water filling device according to the present invention.

FIG. 2 is an explanatory view of a conventional automatic water filling device.

[Explanation of symbols]

 1 Heat Source Machine 2 Hot Water Tank 3 Heat Exchanger 4 Circulation Pump 5 Hot Water Piping 6 Terminal 7 Water Level Detector 8 Water Supply Control Valve 9 Control Circuit (Automatic Water Filling Device) 10 Control Section 11 Time Measurement Section 12 Water Filling Completion Judgment Section 13 Judgment Time Arithmetic section

Claims (1)

[Claims] 1. A hot water heating system in which hot water generated in a heat source device is circulated in a radiator for heating, and the returned hot water is returned to the inside of the heat source device via a hot water tank. A water level detector that detects low and high water levels is installed in the hot water tank by connecting the attached water supply line, and the air inside the system is evacuated while driving the circulation pump, and the water level detector detects the low water level. Then, the water supply control valve is driven to supply water until it reaches a high water level, and when the water filling time interval exceeds a certain time, the automatic water filling device that determines that water filling is completed starts automatic water filling operation and then The water supply time interval is measured and stored, and the judgment time until the third water supply is set to a preset time. After the fourth time, if the difference from the previous water supply time interval is greater than a certain value, An automatic water filling device in a hot water heating system, comprising a determination time calculation circuit that sets a subsequent determination time interval short and sets the determination time interval long when the difference between the time intervals is a certain value or less.