JPS6113821Y2 - - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a hydraulically responsive valve for an instantaneous water heater, and more particularly to an improvement in the water draining structure of the hydraulically responsive valve.

A conventional instantaneous water heater consists of a diaphragm chamber that is divided into a primary chamber and a secondary chamber with a diaphragm inside, and the flow of gas, etc. to the main burner is related to the movement of the diaphragm by the pressure of the water supply. Hydraulic response valves are commonly used to control the supply of twisting material, and in particular in first-stop type instantaneous water heaters, two valves in the diaphragm chamber are used to operate the hydraulic response valves in immediate response to the opening and closing operations of the first stopcock. The next chamber is connected through a small diameter passage to a low pressure water passage leading from the hydraulically responsive valve to the heat exchanger at the subsequent stage. Therefore, water always flows into the secondary chamber, and water accumulates in the secondary chamber even when the instantaneous water heater is not in use, but the accumulated water freezes in extremely cold regions or in extremely low-temperature climates. This causes an accident in which the hydraulic valve is damaged.

Conventional instantaneous water heaters are equipped with various types of water drainage mechanisms to prevent damage due to freezing of residual water in the water flow path, but the secondary chamber of the diaphragm chamber is only the small diameter passage. Since the structure is a closed room, a complete water removal effect from the room cannot be expected.

The present invention utilizes the operation of a hydraulic valve, which is a central mechanism that controls the start and stop of an instantaneous water heater, to completely drain the residual water in the secondary chamber of the diaphragm chamber of the hydraulic valve. The present invention proposes a water pressure-responsive valve for an instantaneous water heater.The water-pressure-responsive valve for an instantaneous water heater of the present invention has a diaphragm inside and communicates with a high-pressure water flow path through which high-pressure water flows from a water pipe. It consists of a diaphragm chamber divided into a primary chamber that communicates with the water flow path from the constriction section to the heat exchanger, and a secondary chamber that communicates with the low-pressure water flow path from the constriction section to the heat exchanger. A hydraulically responsive valve of the type for controlling the supply of fuel to a main burner in conjunction with the movement of the diaphragm due to pressure fluctuations in the secondary chamber, the dish having a peripheral edge extending in a direction substantially perpendicular to the plane of the bottom. a shape receiving seat is attached to the side of the diaphragm facing the secondary chamber, and a first communication hole is provided in the secondary chamber,
The communication hole is opened and closed by a peripheral edge of a dish-shaped seat attached to the diaphragm, and the first
A valve chamber including a second communication hole that communicates with the atmosphere and an on-off valve that freely opens and closes the hole is provided outside the communication hole, and a small diameter passage that communicates the secondary chamber with the low-pressure water flow path. is provided at least at a position below the first communication hole installation position.

The present invention will be explained below with reference to an illustrated example. Reference numeral 1 denotes a diaphragm chamber which is a component of a hydraulically responsive valve to which the present invention is applied. A diaphragm 2 installed in the chamber connects a primary chamber 1a and a secondary chamber 1b. Separated.

The primary chamber 1a communicates with a high-pressure water passage 3a bounded by a constriction part 4, and the secondary chamber 1b communicates with a small-diameter passage 5.
This communicates with the low-pressure water flow path 3b bordering on the throttle portion 4.

Note that the small-diameter passage 5 is installed below the opening position of the first communication hole 10, which will be described in detail later, and preferably in the lower part of the secondary chamber 1b. In this case, the small-diameter passage 5 opens at the surface of a counterbore 16 that is formed to extend above the peripheral edge 6b of the saucer-shaped seat 6 that has risen to the highest position.

The high-pressure water flow path 3a communicates with a water pipe via a water pressure valve (not shown), and the low-pressure water flow path 3b
is in communication with a heat exchanger (not shown).

A valve rod 7 is attached to the side of the diaphragm 2 facing the secondary chamber 1b and is erected on the diaphragm 2 with one end abutting a dish-shaped seat 6, which will be described in detail later, and has an on-off valve at the other end. 8, and the on-off valve freely opens and closes a fuel supply hole 9 for supplying gas or the like to a main burner (not shown).

The on-off valve 8 is a primary chamber 1 of the diaphragm chamber 1.
When the diaphragm 2 is pushed upward due to the pressure difference between the high pressure water flow supplied to the secondary chamber 1b and the low pressure water flow supplied to the secondary chamber 1b, the fuel supply hole 9 is opened,
Fuel is thereby supplied to the main burner.

According to the present invention, a dish-shaped receiver 6 is provided on the side of the diaphragm 2 facing the secondary chamber 1b of the diaphragm chamber 1.
Attached. This dish-shaped seat 6 includes a peripheral edge 6b extending in a direction perpendicular to the plane of the bottom 6a,
Its outer diameter is equal to the inner diameter of the secondary chamber 1b, and thus the peripheral edge 6b of the dish-shaped seat is in close contact with the side surface of the secondary chamber 1b.

The outer diameter of the dish-shaped catch 6 is approximately equal to the inner diameter of the secondary chamber 1b of the diaphragm chamber, and a groove is provided on the outer peripheral surface of the peripheral edge 6b of the dish-shaped catch. It is also possible to fit an annular sealing strip.

According to the present invention, a first communication hole 1 communicating with the atmosphere is further provided on the side surface of the secondary chamber 1b of the diaphragm chamber.
0 is provided, and a second communication hole 1 is provided outside the communication hole.
2 and an on-off valve 13 attached to the hole via a spring 15 so as to be openable and closable.
will be provided.

Note that a member indicated by a dotted line in the figure and designated by the reference numeral 11 is a known drain plug provided in the high-pressure water flow path 3a, but this is not necessary in the present invention as will be described later.

The effects of the hydraulically responsive valve of the present invention having the above structure will be described below.

When you open the main faucet and then open the stop faucet,
From the high pressure water flow path 3a to the primary chamber 1 of the diaphragm chamber 1
A high-pressure water flow path is supplied to a, and when the high-pressure water flow passes through the constriction part 4, the pressure is reduced and a low-pressure water flow 3 is generated.
b is supplied to the secondary chamber 1b of the diaphragm chamber 1.

In this way, a pressure difference is generated between the primary chamber and the secondary chamber, so the diaphragm 2 is pushed up toward the secondary chamber 1b as shown by the dotted line in the figure, which causes the on-off valve 8 to open the fuel supply hole 9. As mentioned above, fuel such as gas is supplied to the main burner, but as the diaphragm 2 operates, the peripheral edge 6b of the dish-shaped seat 6 attached to the side facing the secondary chamber 1b The communication hole 10 provided on the side surface of the secondary chamber 1b is closed.

When the first stopper is closed to stop hot water from being dispensed, the diaphragm 2 returns to its original position, and the peripheral edge 6b of the dish-shaped catch opens the first communication hole 10 provided on the side surface of the secondary chamber 1b. .

At this time, since the main faucet is still open, the on-off valve 13 is pressed against the second communication hole 12 by the water pressure in the secondary chamber 1b of the diaphragm chamber, thereby preventing water from leaking from the communication hole 12. is prevented.

When the main faucet is closed to end the use of the instantaneous water heater under the above conditions, it is necessary to release the residual water inside the equipment in extremely cold regions or in extremely low temperature climates, but the water pressure response valve of this invention In the instantaneous water heater equipped with this, when the first stopper is opened, both the primary chamber 1a and the secondary chamber 1b of the diaphragm chamber have zero pressure. The communication hole 12 is opened. This second communication hole 12
As a result of opening the drain valve 11 in a conventional water heater, the drain valve 11 is opened from the secondary chamber 1b to the pipe line leading to the low-pressure water passage 3b, the heat exchanger, and the hot water tap circuit (all not shown). Since air flows in through the communication hole 12 and the first communication hole 10, the residual water in the pipe is discharged from the outlet. In this case,
The residual water in the high-pressure water channel 3a upstream of the constriction part 4 will remain in the channel 3a, but as described above,
Since the residual water in the secondary chamber 1b and the low-pressure water flow path 3b has already been discharged, sufficient volume is secured to absorb the volumetric expansion of the residual water in the high-pressure water flow path 3a. will not be destroyed.

On the other hand, as described above, the residual water in the secondary chamber 1b is discharged to the tap water outlet through the small diameter passage 5 as the second communication hole 12 is opened. As shown, at least the first communication hole 10
Because it is located below the opening position of the chamber 1b, even if a small amount of water remains in the chamber 1b, there is enough volume in the chamber 1b to absorb the volumetric expansion of the residual water. Since this is secured, equipment such as the diaphragm 2 will not be damaged.

As mentioned above, a small amount of water from the water pressure-responsive valve of the instantaneous water heater of the present invention and the water drain communication hole may cause unnecessary anxiety to general users when the water heater is temporarily out of use. Completely prevents water leakage,
In addition, by linking with the operation of the diaphragm, which is a component of the hydraulically responsive valve, it is easy to drain residual water from the secondary chamber of the diaphragm chamber, which was previously considered difficult, and the conventional drain plug is omitted. can do.

[Brief explanation of the drawing]

FIG. 1 is a sectional view showing the main parts of the water pressure responsive valve of the instantaneous water heater of the present invention. 1...Diaphragm chamber, 1a...Primary chamber, 1b
... Secondary chamber, 2 ... Diaphragm, 3a ... High pressure water flow path, 3b ... Low pressure water flow path, 4 ... Throttle section, 5
. . . Small diameter passage, 6 . . . Dish-shaped seat, 10 .

Claims (1)

[Scope of utility model registration request] From a diaphragm room that is equipped with a diaphragm and divided into a primary chamber that communicates with a high-pressure water flow path through which high-pressure water flows from the water pipes, and a secondary chamber that communicates with a low-pressure water flow path that extends from the throttle part to the heat exchanger. A type of hydraulic response that controls the supply of fuel to the main burner in conjunction with the operation of the diaphragm due to pressure fluctuations in the secondary chamber caused by opening and closing operations of a stopcock provided at a downstream stage of the heat exchanger. In the valve,
a dish-shaped receiver having a peripheral edge extending in a direction substantially perpendicular to the plane of the bottom portion is attached to the side of the diaphragm facing the secondary chamber, and a first communication hole is provided in the secondary chamber; The communication hole is opened and closed by a peripheral edge of a dish-shaped seat attached to the diaphragm, and a second communication hole communicating with the atmosphere is connected to the outside of the first communication hole, and the hole is closed so as to be openable and closable. An instantaneous hot water bath characterized in that a valve chamber including an on-off valve is provided, and a small-diameter passage communicating the secondary chamber with the low-pressure water flow path is provided at least at a position below the first communication hole installation position. Water pressure responsive valve for boiler.