JPS5930840Y2 - Automatic drainage device for stop-start instant water heaters - Google Patents

Description

[Detailed description of the invention] This invention relates to an automatic drain device for stop-off instantaneous water heaters, which prevents dangers caused by abnormal boiling, such as equipment bursting if the shower hose is accidentally bent during shower use. At the same time, the drainage system is prevented from being damaged by freezing during the winter.

This will be explained below based on the illustrated embodiment. 1 is a water tap, 2 is a water governor, 3 is a water pipe leading to a heat exchanger 4, and 5 is a water supply pipe.
7 is a water supply pipe leading from the heat exchanger 4 to the shower 6; 7 is a drain valve that opens and closes a drain port 8 formed at the bottom of the water supply pipe 5; 9 is a drain valve that opens and closes a drain port 8;
is a spring that presses the drain valve 7 in the direction of closing it.

10 is a hydraulic reactor associated with the drain valve 7, which is divided into a high pressure chamber 12 and a low pressure chamber 13 by a diaphragm 11.

14 is a rod connected to the diaphragm 11 at one end and attached to the drain valve 7 at the other end.

A spring 15 is placed in the low pressure chamber 13 and always biases the drain valve 7 in the direction of opening.

16 is a venturi provided at the lower part of the hot water supply pipe 5 near the drain valve 7 and downstream of the drain port 8; 17 is a negative pressure introduction pipe introduced from the venturi 16 to the low pressure chamber 13 of the hydraulic reactor 10.

18 is a sealed tank provided in the negative pressure introduction pipe 17, and the hydraulic reactor side 17a of the negative pressure introduction pipe 17 is connected to the upper surface of the tank 18 from above, and the venturi side 17b is connected to the tank 18 from above. The water pressure reactor side 17 a of the negative pressure introduction pipe 17 is connected to the lowermost part of the side surface of the tank 18 from the side thereof.
and the venturi side 17b are disposed so as to be perpendicular to each other in the tank 18 section.

19 is a high pressure introduction pipe that communicates the water supply pipe 3 and the high pressure chamber 12.

20 is a shower hose, 21 is a temperature controller, and 22 is a gas burner.

The present invention has such a configuration, and its operation will be explained next.

First, when the water tap 1 is opened and the gas burner 22 is ignited by an appropriate means, the water heated by the heat exchanger 4 becomes hot water and is ejected from the shower 6. A pressure difference is generated between the chamber 12 and the low pressure chamber 13, and the pressure on the chamber 12 side becomes high, the diaphragm 11 rises against the force of the spring 15, and the drain valve 7 closes to the drain port 8.
occlude.

Therefore, hot water will not leak from the drain port 8 during hot water supply, and there will be no problem in use.

If the user accidentally bends the shower hose 20 while using the shower, water flow will stop and the differential pressure between the high pressure chamber 12 and the low pressure chamber 13 will disappear, and the biasing force of the spring 15 will cause the diaphragm to 11 is lowered, and the drain valve 7 opens the drain port 8.

Therefore, all of the hot water heated in the heat exchanger 4 flows out from the drain 8, which may cause the heat exchanger to rupture due to stagnation in the heat exchanger 4 and cause an abnormal rise, or steam to blow out from the shower 6. It is possible to prevent the danger of

By the way, when the water supply faucet 1 is closed to stop hot water supply, water pressure is no longer applied to the high pressure chamber 12 and the low pressure chamber 13. Therefore, the diaphragm 11 is lowered by the force of the spring 15, and the drain valve 7
opens the drain port 8.

Therefore, all the water in the water passage downstream from the water tap 1 is discharged through the drain port 8. However, if the negative pressure introduction pipe 17 is not provided with the tank 18, the diaphragm 11 will drop when the water supply is stopped. Water is sucked from the venturi 16 by volume, and this water may accumulate in the low pressure chamber 13 and freeze in winter.

However, in the present invention, although a tank 18 is provided in the negative pressure introduction pipe 17, only the air accumulated in the tank 18 is sucked in when the diaphragm 11 descends, and the water from the venturi 16 is Since the water is only sucked into the tank 18 and does not reach the low pressure chamber 13, there is no need to worry about freezing as described above.

It goes without saying that the water accumulated in the lower part of the tank 18 is drained out through the drain port 8.

Although the negative pressure introduction pipes 17a and 17b before and after the tank are arranged to be perpendicular to each other at the tank 18 section, the water from the venturi side 17b is too strong and the pressure reactor side 17a
7a and will not be sucked in, making the above-mentioned anti-freezing effect even more reliable.

As described above, according to the present invention, it is possible to prevent the danger of abnormal boiling due to bending of the shower hose, and also to prevent freezing damage to the drainage device itself, thereby providing an extremely safe instantaneous water heater. .

[Brief explanation of the drawing]

The drawing is a schematic diagram showing an embodiment of the present invention. 5...Hot water pipe, 7...Drain valve, 10.
...Hydraulic reactor, 11...Diaphragm, 12...High pressure chamber, 13...Low pressure chamber,
14...Rod, 15...Spring, 16
...Venturi, 17, 17 a, 17
b... Negative pressure introduction pipe, 18... Tank.

Claims (2)

[Scope of utility model registration request] (1) The water pressure reactor is divided into a high pressure chamber and a low pressure chamber by a diaphragm, the diaphragm and the drain valve are connected by a rod, and a spring is provided to bias the drain valve in the opening direction.
In a device in which the drain valve is closed by differential pressure when water is flowing, the drain valve is provided to open and close the drain port formed at the bottom of the hot water pipe leading from the heat exchanger to the shower, and a venturi is installed in the hot water pipe. An automatic drainage device for a stop-start instantaneous water heater, characterized in that a negative pressure introduction pipe is connected from the venturi to a low pressure chamber of a water pressure reactor, and a tank is provided in the negative pressure introduction pipe. (2) The stop-start instantaneous water heater according to claim 1, wherein the water pressure reactor side and the venturi side of the negative pressure introduction pipes before and after the tank are arranged so as to be orthogonal to each other in the tank part. Automatic drainage device in.