JP3017891B2 - Water leak inspection device in hot water heating system - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

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

[0002]

2. Description of the Related Art FIG. 2 shows a conventional water leak inspection apparatus. 1 is a hot water tank, 2 is a water level detector attached to the hot water tank 1, 3 is a water supply line connected to the hot water tank 1, 4 is a water supply control valve, 5 is a circulation pump, 6 is a heat exchanger, 7 is a radiator, 8 is a hot water outgoing pipe, 9 is a hot water return pipe, 1
0 is a water control valve attached to the hot water inlet side of the radiator 7,
Numeral 11 denotes an automatic water leak judging device.
Opens the water supply control valve 4 by the automatic control circuit 17 to supply water until the inside of the hot water tank 1 is full, then opens the water control valve 10 of the target radiator 7 and drives the circulation pump 5 The hot water is circulated in the system, and the circulation is continued for a certain period of time. This time is measured by the time measuring circuit 12 and the number of times the water supply control valve 5 is driven during the time period is measured. It is determined at step 13 that if the number of times is equal to or more than a certain number within a specified time, it is determined that there is water leakage.

[0003]

However, the above-mentioned conventional water leak inspection apparatus 11 has the following disadvantages. a. Unless the water control valve 10 on the side of the radiator 7 is opened, a leak in the system cannot be accurately inspected. b. If the air in the hot water pipe is not sufficiently vented, it is not possible to distinguish between water reduction due to air leakage and water leakage due to water leakage. c. Since the water pressure on the outgoing side and the return side of the pipe are different and the water pressure on the return side is small, it takes a long time before the inspection especially when there is a leak on the return side.

An object of the present invention is to provide a water leak inspection apparatus which does not have the disadvantages described in the above items a to c.

[0005]

The structure of the water leak inspection device in the hot water heating system according to the present invention is as follows.

[0006] A hot water tank with a water level detector, a circulation pump,
In a system in which heating is performed by a hot water circulation system that circulates a heat exchanger, a radiator, and a hot water tank, a hot water going pipe after exiting the heat exchanger is branched by a branch pipe and connected to a hot water return pipe. The piping system switching device was attached to the system, and at the time of water leak inspection, the piping system switching device was driven so that the water pressure on the hot water outgoing pipe side was also applied to the hot water return pipe side including the radiator. In this state, when the same pressure is applied to both the hot water feed pipe and the return pipe by driving the circulating pump to stabilize the pressure, and after a certain time, the water level in the hot water tank drops to a certain level. Wherein a water leak determination circuit for determining that there is a water leak is provided in the hot water heating system.

[0007]

[Action] To check for water leakage, open the water supply control valve and supply water until the hot water tank is full, then drive the piping system switching device to return the hot water going pipe to the hot water via the branch pipe. Communicate with pipe side. Next, the circulating pump is driven to apply pump pressure to the return pipe via the hot water feed pipe and the branch pipe, and at the same time, time measurement is started. The water level is detected by a water level detector inside, and when this water level is below a certain level, it is determined that there is water leakage.

[0008]

1 shows an embodiment of a water leak inspection apparatus according to the present invention.

Reference numeral 1 denotes a hot water tank, 2 denotes a water level detector attached to the hot water tank 1, 3 denotes a water supply line connected to the hot water tank 1, 4 denotes a water supply control valve, 5 denotes a circulation pump, and 6 denotes a heat pump. An exchanger, 7 is a radiator, 8 is a hot water outgoing pipe, 9 is a hot water return pipe, 10 is a water control valve attached to the hot water inlet side of the radiator 7, and 11 is an automatic water leak judging device. In the chamber 11, the circulation pump 5 is driven, and at the same time, measurement of a certain time is started, and whether or not the water level in the hot water tank 1 has changed by a certain level or more within this certain time is monitored by an input from the water level detector 2. In addition, a water level change time measuring circuit 16 which determines that there is water leakage when the water level change exceeds a certain level, and an automatic control circuit 17 which controls the water supply control valve 4 are incorporated.

Reference numeral 14 denotes a branch pipe branched from the hot water outgoing pipe 8, and the end thereof is connected to the hot water return pipe 9 via a piping system switching device 15.

In the above embodiment, when performing a water leak inspection, the water supply control valve 4 is opened to supply water until the inside of the hot water tank 1 is full, and then the piping system switching device 15 is driven to send hot water. The pipe 8 is connected to the hot water return pipe 9 by the branch pipe 14. Next, the circulating pump 4 is driven to apply pump pressure to the return pipe 9 via the hot water feed pipe 8 and the branch pipe 14, and at the same time, time measurement is started by the water level change time measurement circuit 16, and this time is measured. The amount of water reduction during the elapse of a certain time is detected by the water level detector 2 in the hot water tank 1, and when this water level is lower than a certain level, it is determined that there is water leakage.

As described above, the present invention is constructed so that the same pressure is applied to both the hot water return pipe and the hot water return pipe to check for water leakage, so that the following effects can be obtained. a. Water leakage in the system can be inspected accurately without opening the water control valve on the radiator side. b. Even when air is not sufficiently vented from the hot water pipe, water leakage can be accurately distinguished and determined. c. Since a high pump pressure can be applied to both the hot water outgoing pipe and the return pipe, the inspection time can be reduced.

[Brief description of the drawings]

FIG. 1 is an explanatory view of a water leak inspection device according to the present invention.

FIG. 2 illustrates a conventional water leak inspection device.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 Hot water tank 2 Water level detector 3 Water supply line 4 Water supply control valve 5 Circulation pump 6 Heat exchanger 7 Radiator 8 Hot water going pipe 9 Hot water return pipe 10 Water control valve 11 Automatic water filling judgment device 14 Branch pipe 15 Pipe line switching device 16 Water level time change measurement circuit 17 Automatic control circuit

Claims (1)

(57) [Claims] Claims: 1. In a system for heating by a hot water circulation system routed around a hot water tank with a water level detector, a circulation pump, a heat exchanger, a radiator, and a hot water tank, a hot water outflow pipe after leaving the heat exchanger is provided. A branch pipe is connected to the hot water return pipe, and a piping system switching device is attached to this connection portion. At the time of water leak inspection, the piping system switching device is driven so that the water pressure on the hot water outflow pipe side is increased. Is set so as to also apply to the hot water return pipe side including the radiator, and in this state, the circulation pump is driven to apply the same water pressure to both the hot water going pipe and the return pipe, and this pressure is stabilized. A water leakage inspection device for a hot water heating system, comprising: a water leakage determination circuit that determines that there is water leakage when the water level in the hot water tank drops to a predetermined level after a predetermined time.