JPS6214074B2 - - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION (Industrial Application Field) The present invention relates to a device for stopping abnormal water leakage in a cold/hot water circulation circuit of an air conditioner installed inside a building.

(Conventional technology and its problems) Damage due to corrosion or erosion of piping members in cold/hot water circulation circuits, cold/hot water coils, etc., defective piping work, separation of soldering, damage to seals of valves and joints, etc. As a result, abnormal water leakage may occur in the cold/hot water circulation circuit, but currently it is not easy to detect water leakage, and if leakage detection is delayed, it not only results in waste of makeup water, but also damage to carpets, furniture, and other items. Water damage, contamination of ceilings, floors, and wall materials, as well as staining and deterioration due to mold generation, increase damage to buildings, furniture, etc., increase repair costs and repair periods, and cause damage during the restoration work period. This results in deterioration of livability and hindrance to business operations.

(Means and effects for solving the problem) The present invention detects water leakages that occur unexpectedly in the cold/hot water circulation circuit of air conditioning equipment at an early stage, stops abnormal water leakage, and removes water from buildings, furniture, etc. The purpose of this system is to prevent the occurrence of damage to people, and its structure is as follows.

Water is added to the expansion tank in an abnormal water leakage stop device for the piping system of air conditioning equipment, which has a heat exchanger, circulation pump, outgoing water pipe, load equipment, water return pipe, expansion pipe, and expansion tank that make up the cold/hot water circulation circuit. A supply water pipe equipped with a water flow control valve and a float valve;
A solenoid valve is provided in which two electrodes are installed hanging inside the expansion tank, and the circulation pump is stopped by cutting off the current between the two electrodes when the water level in the expansion tank drops, and the solenoid valve is installed in the main outgoing water pipe. A load opening/closing relay is provided to close the expansion tank, and a check valve for the return pipe is installed in the main pipe of the water return pipe to block the flow from the heat exchanger to the load equipment. This is a piping system leak stop device that blocks water.

Therefore, in case of normal water leakage in air conditioning equipment, water is replenished from the make-up water pipe to the expansion tank by operating the float valve, and the water level is maintained within the current-carrying range between the two electrodes.

When the water level in the expansion tank decreases due to abnormal water leakage, the current between the two electrodes suspended in the expansion tank is cut off, and the load switching relay is activated to stop the circulation pump. In addition, the solenoid valve installed in the main outgoing water pipe is closed, and the return pipe check valve prevents the flow from the solenoid valve and the heat exchanger toward the load equipment, allowing cooling and cooling to flow from the expansion tank.
Water flow to the hot water circulation circuit is blocked.

(Example) Hereinafter, one example of the present invention will be described based on the drawings.

1 is a heat exchanger, and the cold/hot water heat exchanged here is sent to the main pipe 3 of the outgoing water pipe by the circulation pump 2.
The water is sent to the main pipe 4 of the water return pipe and returns to the heat exchanger 1. The cold/hot water from the main pipe 3 of the outgoing water pipe is supplied to the fan coil unit 5, which is a load device installed in an appropriate number in the branch pipe of the outgoing water pipe, and after cooling or heating the air, returns to the main pipe 4 of the return water pipe. , which is used in circulation and forms a cold/hot water circulation circuit. 6
is an expansion pipe, which is used to release water supply/replenishment to the cold/hot water circulation circuit and volumetric expansion of hot water to the open expansion tank 7. The expansion tank 7 has a water supply pipe 8 for directly supplying water from a water supply source, and a supplementary water pipe 8' equipped with a water volume adjustment pot 9 and a float valve 10.
are arranged in parallel. The water volume adjustment pot 9 may be a solenoid valve. The above piping and equipment constitute the water supply circuit. In addition, there are two electrodes in the expansion tank 7, namely, a reference electrode 11 and an alarm electrode 1.
The alarm electrode rod 1 is suspended below the reference water surface controlled by the float valve 10, and the alarm electrode rod 1 is suspended from the reference water surface.
The distance to the tip of No. 2 is the set value hm for lowering the water level. 13 is a load switching relay operated by a signal current from an electrode rod; 14 is an alarm buzzer and lamp connected to the load switching relay 13;
15 is a motor for driving the circulation pump.
Further, a solenoid valve 19 operated by a load switching relay 13 is provided between the main pipe 3 of the outgoing water pipe, specifically between the heat exchanger 1 and the circulation pump 2. In addition, a heat exchanger 1 is installed near the entrance of the main pipe 4 of the water return pipe to the heat exchanger 1.
A check valve 20 for the water return pipe is provided to prevent the flow from flowing toward the fan coil unit 5, which is a load device. The solenoid valve 19 and the check valve 20 are for preventing water from flowing into the cold/hot water circulation circuit when abnormal water leakage occurs in the cold/hot water circulation circuit and the circulation pump 2 is stopped.

The apparatus for stopping abnormal water leakage in a piping system according to the present invention is configured as described above. In the cold/hot water circulation circuit of an air conditioner, some water leakage is inevitable, and in particular, it is common for water to leak from the shaft seal of the circulation pump 2. In order to replenish this constant water leakage, a water volume adjustment kettle 9 is set so as to be balanced with the amount of water leakage, and the water level in the expansion tank 7 is maintained at a constant standard water level by the action of the float valve 10. Currently, an abnormal water leak has occurred in the cold/hot water circulation circuit.
The amount of leaked water exceeds the amount of makeup water from makeup water pipe 8',
When the water level in the expansion tank 7 decreases and the water level drops below the tip of the alarm electrode rod 12, the generated signal current activates the load switching relay 13, activates the alarm buzzer and lamp 14, and drives the circulation pump. stop the motor 15 and close the solenoid valve 1.
9 is closed, and together with the action of the return pipe check valve 20, water flow to the cold/hot water circulation circuit is blocked, and a large amount of water leakage is prevented.

Here, the amount of makeup water per unit time is qsl/H The amount of water leakage per unit time is qel/H The cross-sectional area of the expansion tank is Sm ² The set value for water level drop is hm The time is t, then qet=qst+1000Sh or more leakage is detected. can do.

After the manager confirms the alarm, the alarm buzzer and lamp 14 are stopped by pressing a confirmation button (not shown), and after the leak is repaired, water is supplied to the expansion tank 7 using the water supply pipe 8, and the load switching relay 13 is manually operated. Bring it back.

In addition, when the main pipe 4 of the return pipe and the expansion pipe 6 are partially used in common as shown in FIG. It may be provided.

(Effects of the Invention) As can be easily understood from the above explanation, by using the piping system water leakage stopping device of the present invention, the cold/hot water circulation circuit of air conditioning equipment installed inside a building can be improved. Detects abnormal water leakage that occurs unexpectedly at an early stage, reports it to the administrator, stops the circulation pump, blocks water flow to the cold/hot water circulation circuit, and prevents abnormal leakage of stored water, thereby preventing damage from occurring. Prevented.

[Brief explanation of the drawing]

FIG. 1 is a system diagram of an abnormal water leakage stop device in a cold/hot water circulation circuit of an air conditioning equipment according to one embodiment of the present invention, and FIG. FIG. 3 is a layout diagram showing the installation positions of a stop valve and a solenoid valve. 1...Heat exchanger, 2...Circulation pump, 4...Main pipe of return pipe, 5...Fan coil unit (load equipment),
8'...Replenishment water pipe, 9...Water volume adjustment pot, 10...Float valve, 11...Reference electrode rod, 13...Load switching relay, 19...Solenoid valve, 20, 20'...Return pipe check valve.

Claims (1)

[Claims] 1. Replenishment of water to the expansion tank in an abnormal water leakage stop device for the piping system of air conditioning equipment that has the heat exchanger, circulation pump, outgoing water pipe, load equipment, return pipe, and expansion pipe and expansion tank that constitute the cold/hot water circulation circuit. A supply water pipe is equipped with a water flow control valve and a float valve, and two electrodes are provided that hang down inside the expansion tank.
A load opening/closing relay is installed that stops the circulation pump and closes the solenoid valve installed in the main outgoing water pipe when the current flow between the two electrodes is cut off due to a drop in the water level in the expansion tank. An abnormality in a piping system characterized by installing a return pipe check valve in the main water pipe to prevent the flow from the heat exchanger to the load equipment, thereby blocking the flow of water from the expansion tank to the cold/hot water circulation circuit. Water leakage stop device.