JPS623650Y2 - - Google Patents

Description

[Detailed description of the invention] This invention relates to a water draining device that prevents water heaters from freezing.

Water heaters are equipped with drain plugs to prevent malfunctions due to freezing during the winter, and when not in use, the drain plugs are removed to drain the water inside the water heaters.

However, in the case of a water heater that is equipped with an orifice and operates a water flow switch to open an electromagnetic gas valve when water is supplied, even if the drain valve is removed, the hole in the orifice is small, so the surface of the water that forms in this area The problem is that the water does not drain completely due to the tension, and even if it does, the orifice is blocked by the dripping water from the heat exchanger and the water freezes there, causing the water flow switch to not work when reused. It was hot.

The purpose of this invention is to solve the above-mentioned drawbacks of conventional water draining devices.

That is, this invention provides a substantially vertical drain hole at the lower end of the water chamber of the water flow switch mechanism, communicates one side of the middle part of the drain hole with the front chamber of the diaphragm through a communication passage, and connects the drain hole with the front chamber of the diaphragm. The removably attached drain plug is provided with a communication path that communicates with the diaphragm front chamber and an orifice that communicates with the lower part of the water chamber when the drain plug is attached to the drain hole.

An embodiment of this invention will be described below in detail with reference to the accompanying drawings.

In the figure, A is a water pressure responsive valve, 1 is its main body, and has a water supply pipe 2 leading to a water supply or the like. 4 is a diaphragm sandwiched between the main body 1 and the cover 5, 6 is a flow rate regulating valve that moves together with the diaphragm 4, and 7 is an operating piece swingably provided in a water chamber 8 provided in the cover 5 to operate the water flow switch. It is something. In the illustrated example, this water flow switch is a reed switch 9. That is, a permanent magnet 10 is fixed to the actuating piece 7, and the wall of the switch attachment part of the water chamber 8 is made of non-magnetic material such as brass, and when the permanent magnet 10 approaches the reed switch 9, this switch is closed.
A gas valve (not shown) operated by an electromagnet is configured to open.

Further, the diaphragm 4 is supported by a spring 11, and a communication path 1 communicating with the aforementioned chamber of the diaphragm 4 is provided.
2, 13 are provided, a drain hole 14 is provided that communicates with the communication path 12 and the water chamber 8, and the communication path 13 communicates with the water chamber 8.
The water chamber 8 communicates with the communication pipe 3 which communicates with the heat exchange section. Reference numeral 15 denotes a drain plug, and its outer male thread is screwed into the inner female thread of the drain hole to be fixed. Reference numeral 16 denotes an orifice portion provided inside the drain plug 15, which throttles the flow path from the communication path 12 to the water chamber 8, lowers the water pressure in the water chamber 8, and operates an actuating piece.

This device has the above-mentioned configuration, and when the water heater is not used with the drain plug 15 fixed in the drain hole 14 as shown in Fig. 1, the water supply pipe 2, the chambers before and after the diaphragm 4, and the communication passage 12, 13, the orifice part 16, the water chamber 8, and the communication pipe 3 are filled with water, and the actuating piece 7 is lowered, so the gas valve is closed, but when water supply starts, a water flow is generated and the chambers before and after the diaphragm 4 are closed. A difference in water pressure is generated, the flow rate regulating valve 6 is activated, and the water flow flowing into the water chamber 8 from the orifice portion 16 causes the operating piece 7 to rotate upward, and the permanent magnet 1
0 activates the reed switch 9 to open an electromagnetic gas valve (not shown) and send gas to the gas burner.

As is clear from the above action, the water heater is filled with water, so if the water is not drained during cold weather, the water inside will freeze.In the case of this device, removing the drain plug 15 will prevent this. Since the integrated orifice portion 16 is also pulled out, a large diameter drain hole 14 is created as shown in FIG.

Therefore, all the water in the room before and after the diaphragm 4, the water chambers in the communication passages 12 and 13, the communication pipe 3, and the water in the heat exchanger connected thereto are discharged, so water remains and prevents breakdowns due to freezing and reuse. This eliminates the risk of the orifice sometimes freezing and making it impossible for water to flow through and making it unusable.

[Brief explanation of the drawing]

FIG. 1 is a longitudinal sectional side view showing one embodiment of the draining device of this invention, and FIG. 2 is a longitudinal sectional side view of the same with the drain plug removed. 4...Diaphragm, 14...Drain hole, 15
... Drain valve, 16 ... Orifice part, A ... Water pressure response valve.

Claims (1)

[Scope of utility model registration request] A diaphragm is installed between a diaphragm mounting part provided on the main body and a cover placed over this mounting part, the main body side of the diaphragm is used as a diaphragm front chamber leading to a water supply pipe having a flow rate adjustment valve, and the cover side of the diaphragm is used as a diaphragm rear chamber. A communication pipe leading to the heat exchanger is connected to the upper part of the water chamber which is communicated with the rear chamber through a communication passage, the diaphragm front chamber is communicated with the lower part of the water chamber via an orifice, and the water chamber includes: In the water flow switch mechanism provided with a switch operating piece operated by the water flow flowing into the water chamber from the orifice, a substantially vertical water drain hole is provided at the lower end of the water chamber, and one side of the middle part of the water drain hole is provided. , a drain plug that communicates with the diaphragm front chamber through a communication path and is removably attached to the drain hole, when the drain plug is attached to the drain hole, the communication path leading to the diaphragm front chamber and the A water heater water drain device with an orifice that runs through the bottom of the water chamber.