JPH0221728Y2 - - Google Patents

Description

[Detailed Description of the Invention] [Industrial Field of Application] This invention relates to a water draining device for a hydraulically operated device used in a stop-start water heater.

[Conventional technology]

Pre-stop water heaters have a water pressure actuation device installed in the water supply channel that detects water flow and operates in conjunction with the opening and closing operations of the hot water faucet piped in the kitchen or bathroom. A drainage device is provided to prevent the operating members inside the box from being damaged by freezing. Various types of water draining devices have been proposed, all of which have drain holes provided at appropriate locations on the hydraulically actuated device and are opened with drain plugs to drain the water stagnant inside the box.

[Problem that the invention attempts to solve]

However, because the water flow passage inside the box of a hydraulic actuator is complicated, it is difficult to completely drain the accumulated water inside the box. If a small amount of stagnant water remains in the connecting small-diameter low water pressure introduction channel and this freezes, it will block the low water pressure introduction channel and prevent it from operating immediately even if water is recirculated, causing malfunction. becomes.

[Means for solving problems]

In order to solve the above problems, this invention provides a drainage hole 29a at the lower end of the secondary side low water pressure chamber 22b of the water pressure actuation device 20 interposed in the water supply channel 12, and the ventilary passage 29 of the water pressure actuation device 20 Water supply channel 1
2 and the lowermost position of the hot water supply path 14, and drain holes 29b, 29c are provided before and after the ventilate path 23, so that a total of three drain holes 29a, 29b, 29c are provided.
The water draining device of the hydraulically operated device 20 is configured such that the drain plug 32 can be opened by one drain plug 32.

[Effect]

Since this invention is configured as described above, by opening one drain plug 32, the three drain holes 29a, 29b, 2 provided in the hydraulic actuator 20 can be opened.
9c is opened at the same time, and the accumulated water in the box of the hydraulic actuator 20 is completely drained.

〔Example〕

The illustrated embodiment will be described in detail below.

In the overall configuration diagram of FIG. 1, a water pressure operating device 20 is interposed in the water supply channel 12 upstream of the heat exchanger 10, and a diaphragm 21 stretched in the box allows the primary side high water pressure chamber 22a to and secondary side low water pressure chamber 22
The inside of the box of the hydraulic actuator 20 is divided into b and a ventilary passage 23 downstream via the high hydraulic pressure chamber 22a.
A low water pressure introduction passage 24 is provided which communicates from the throat portion 23a of the ventilary passage 23 to the low water pressure chamber 22b. A water pressure regulator 25 is provided on the high water pressure chamber 22a side with its tip in pressure contact with the diaphragm 21, and a drive shaft 26 is provided on the low water pressure chamber 22b side.
is provided with its rear end in pressure contact with the diaphragm 21, and an operating shaft 27 is connected to the tip of the drive shaft 26 on one axis, and a spring 28 wound around the operating shaft 27 causes the drive shaft 26 and the diaphragm 21 to is biased backwards.

A plurality of hot water taps 16a, 16b are provided at the tip of the hot water supply path 14 downstream of the heat exchanger 10, and when any of the hot water taps 16a, 16b is opened, the air between the two chambers 22a, 22b caused by the ventilate effect is removed. The differential pressure is amplified by the diaphragm 21, and the diaphragm 21 is displaced toward the low water pressure chamber 22b against the spring 28,
The drive shaft 26 and the operating shaft 27 also slide forward in conjunction with each other, and the stroke of the operating shaft 27 opens the gas valve 40 and the burner 41 starts combustion.

The ventilate passage 23 is configured to be at the lowest position of the water supply passage 12 and the hot water supply passage 14, and a drainage hole 2 is provided at the lower end of the secondary side low water pressure chamber 22b.
9a is provided, as well as the Bent Yuri road 23
Two drain holes 29b, 29c are provided before and after the drain pipe 3, each drain hole 29a, 29b, 29c forming three drain ports 30a, 30b, 30c.
1 and is normally closed by a drain plug 32 that is removably screwed onto a drain pipe 31.
It is configured so that the drain plug 32 can be removed and opened at the same time.

〔effect〕

The characteristic effects of this invention are as follows.

A drain hole 29a is provided at the lower end of the secondary side low water pressure chamber 22b, and the drain hole 29a is provided before and after the ventilate passage 23.
9b and 29c are provided, the accumulated water inside the box of the hydraulic actuator 20 can be completely drained, and in particular, the water inside the low water pressure introduction path 24 can also be completely drained, so that the mechanism due to freezing can be completely drained. In addition to preventing damage to the parts, it is also possible to prevent malfunctions when water is recirculated.

Furthermore, since the ventilate passage 23 is configured at the lowest position of the water supply channel 12 and the hot water supply channel 14, the water stagnant in the heat exchanger 10 can also be drained at the same time through the drain hole 29c. Freeze damage can be prevented.

Furthermore, since the three drainage holes 29a, 29b, and 29c can be used to simultaneously drain water from one drain plug 32, it has a practical effect such that drainage work can be easily performed. Also, drain plug 3
2 can be easily attached to the bottom surface of the device, does not take up much space, and does not require a mechanical part, so it has practical effects such as being small and inexpensive.

[Brief explanation of the drawing]

The drawings show an embodiment of this invention, and FIG. 1 is an overall configuration diagram. 12... Water supply channel, 14... Hot water supply channel, 20... Water pressure actuation device, 22b... Low water pressure chamber, 23... Ventilary path, 29a, 29b, 29c... Drain hole, 32... Drain plug.

Claims (1)

[Scope of utility model registration request] 2 of the hydraulic actuation devices 20 interposed in the water supply channel 12
A drain hole 29a is provided at the lower end of the next side low water pressure chamber 22b, the ventilate passage 23 of the hydraulic actuator 20 is configured at the lowest position of the water supply channel 12 and the hot water supply channel 14, and the drain hole 29b is provided before and after the ventilate passage 23.
29c, and three drainage holes 29a, 29 in total.
A water draining device for a hydraulically operated device 20 configured so that b and 29c can be opened and closed by one drain plug 32.