JPS603165Y2 - Water stop valve - Google Patents

Description

[Detailed Description of the Invention] The present invention relates to a stop valve that is suitable for use in a stop water heater such as an instantaneous water heater and is installed between a water supply tap (household faucet) and a water heater heat exchanger.

BACKGROUND ART Conventionally, various kinds of water stop valves have been provided for this type of water heater, which allow a one-touch operation for supplying hot water (water supply operation).

In terms of operation, it is common and convenient to open and close the water stop valve body of the water stop valve by pressing and releasing it by moving the operating rod in the axial direction. A considerable amount of pressure is required to close the valve, and when the pressure on the operating rod is released, the valve closes automatically due to the water flow, but the flow energy of the water often causes the valve to close. The water stop valve closes suddenly and collides with the valve seat, causing water hammer, which reduces the durability due to damage to the valve, or especially when the water supply valve has a so-called hanging sesame type structure. In some cases, when the water stop valve body closes, the main valve hanging sesame also closes due to its own weight due to the non-return action, so the pressure water caused by the water stop valve closing is trapped, and the next time the valve is opened, the abnormally high pressure will cause a greater operation. It was easy to cause problems such as requiring force.

Therefore, in order to solve these problems, water stop valves with various structures have been provided, and Utility Model Application Publication No. 54-9736 is one example.

However, the above-mentioned water stop valve body structure is divided into three parts, and it is structurally complex and operates individually for each valve, making it difficult to set the amount of water flow between multiple valves and minute intervals.
It has the disadvantage of being prone to variations and being unreliable.

Therefore, this project is simpler in structure, easier to process, and
The purpose is to provide a practically excellent water stop valve that has an integrated drainage structure so that the water remaining in the heat exchanger can be easily drained when the water is stopped. I will explain.

In the figure, 1 is a casing constituting a water stop valve, 2 is an inflow path through which water flows into the casing 1 by connecting it to a water supply source (not shown), and 3 is a heat exchanger between the water stop valve casing and the water heater. (not shown) to supply water to the heat exchanger, and the inflow and outflow paths form an in-casing water passage.

A valve seat 4 is formed within the water channel, and a bottomed cylindrical main valve body that receives water supply back pressure is slidably provided on the valve seat.

A water passage hole 6 penetrating the bottom wall is provided in the substantially central portion of the bottom of the main valve body 5 that approaches and separates from the valve seat 4, and a back pressure formed by the main valve body and the casing is provided in the cylindrical wall. A pore 7 is provided that communicates the chamber 8 with the inlet channel 2 .

Reference numeral 8 denotes a back pressure chamber, which communicates with the inflow passage 2 through the pore 7 and also communicates with the outflow passage 3 through the water passage hole 6 when necessary.

Reference numeral 9 denotes a sub-valve element that opens and closes the water passage hole 6 of the main valve element 5 from the back pressure chamber 8 side, and is formed so that its pressure-receiving area is smaller than that of the main valve element.

Reference numeral 9a denotes a press rod that presses the sub-valve body 9 to open the water passage hole, and the outer diameter of this part is smaller than the diameter of the water passage hole 6 so that there is a water passage gap therebetween. In the illustrated example, the pressing rod is integrated with the sub-valve body, but it may be formed as a part of a separate operating rod, which will be described later.

Further, this sub-valve body 9 is associated with the pressing rod 9a so that when the main valve body 5 is opened by a water supply operation, the water passage hole 6 is opened prior to the opening of the valve seat 4 of the main body, When the valve seat of the main valve element 5 is closed, a spring 10 is applied from the back pressure chamber 8 side to provide a normally closing habit so that the water passage hole 6 is closed in advance.

Reference numeral 11 denotes an operating rod that is provided so as to open the sub-valve body 9 and the main valve body 5 by being pressed by an appropriate means during water supply operation from outside the stop valve casing 1. It is operated by pressing with a cam, pressing with a lever, etc.
When the pressure is released, the valve is pushed back by the spring 10 to return to closing.

That is, the main valve body 5, the sub valve body 9, the pressing rod 9as operating rod 11, the sub valve body connects the water passage hole 6 of the main valve body 5 with the spring 1.
When the valve seat 4 is closed by a pressure of 0, the main valve body also closes the valve seat 4 by the spring via the sub-valve body, and the pressure rod 9a is slightly larger than the diameter of the water passage hole as described above. The diameter of the operating rod 11 is small, and the tip thereof slightly protrudes from the bottom of the main valve body 5 when the water passage hole of the sub-valve body 9 is closed. It is formed to have a slightly larger diameter.

Reference numeral 12 denotes a residual water discharge channel which branches from the outflow channel 3 and is provided to accommodate the operating rod 11, and a drain valve seat 13 is provided in the middle.
is formed.

Reference numeral 14 denotes a drain valve body that is slidably and loosely fitted to the operating rod 11, and when the operating rod is pressed, that is, when the water passage is opened, the drain valve seat 1
3 to close the drainage channel, and when the pressure is released, the operating rod 11
The locking tools 15,1 are moved backward together to open the drainage channel 12.
6 restricts the sliding range, and is pressed toward the locking tool 15 by a spring 17 interposed between the drain valve body 14 and the locking tool 16.

Next, the function of the water stop valve constructed as described above will be described.

Although the state shown in the figure shows the state when water is stopped, when the operating rod 11 is pressed by an appropriate means when water is supplied, the tip of the operating rod 9a is first pressed to operate the sub-valve element 9, and almost at the same time, the drain valve element 14 is pressed. closes the drainage channel 12.

Since the sub-valve body 9 has a smaller pressure-receiving area than the main valve body 5, it can be operated more easily and before the main valve body to open the water passage hole 6.

Then, since the back pressure chamber 8 in which the sub-valve body operates communicates with the inflow passage 2 through the pore 7 of the main valve body 5, the water supply pressure is determined by the water flowing from the back pressure chamber 8 to the outflow passage 3 through the water passage hole 6. As it flows, it is purged and the pressure is slightly reduced.

Then, if the operating rod 11 is further pressed, the main valve body 5
is easily pressed by the decompression effect, that is, the valve seat 4 is disengaged to open its water passage and completely start supplying water to the heat exchanger.

Incidentally, as the main valve body 5 is opened, the tip of the operating rod 11 appears to close the water passage hole 6 in the illustrated example, but there is a groove on the main valve body 5 or the operating rod 11 side of the contact portion. It is sufficient to form such a water flow relief part, and since the water in the back pressure chamber 8 is discharged from the water flow hole 6 to the outflow path 3, the valve opening operation is not hindered.

In this way, the water from the outflow path 3 is supplied to the heat exchanger of the water heater, but at some point along the way, a hydraulically responsive diaphragm valve that interlocks the gas opening/closing valve of the heating burner is actuated, although this is not shown as it is well known. burner combustion.

Next, when you want to stop the water, release the pressure on the operating rod 11.
The spring 10 of the main valve body back pressure chamber 8 first causes the auxiliary valve body 9 to
is pressed against the main valve body 5 to close its water passage hole 6 and prevent water from flowing from the core.

Next, the main valve body 5 is pressed by the spring 10 and moves in the valve closing direction, but at this time, the back pressure chamber 8 enters a so-called negative pressure state, which prevents the valve closing operation. Since it is communicated with the water supply inflow path 2 through the pore 7 in the wall, water flows in through the pore 7 in the wall, and the valve closing operation is finally completed without being hindered.

Therefore, the closing speed of the main valve body 5 mainly depends on the elastic force of the spring 10 as well as the size of the pore 7, and since the hole is a simple through hole, a hole of any diameter can be formed. A desired valve closing speed can be easily and freely set simply by drilling.

During this water stop, as the main valve body 5 and the sub-valve body 9 return to their closed state, the operating rod 11 is also pressed back, so that the loosely fitted drain valve body 14 also leaves the drain valve seat 13 at a certain point. First, since the outflow passage 3 communicating with the heat exchanger and the residual water discharge passage 12 are communicated with each other, the residual water in the heat exchanger can be discharged from the residual water discharge passage 12, thereby automatically preventing freezing in winter. It will be difficult to prevent it.

As described above, the present invention involves opening and closing the water supply channel water stop valve body of the water stop valve with a bottomed cylindrical main valve body and the water passage hole at the bottom of the main valve body prior to the main valve body to receive pressure. As a two-part sub-valve body whose area is smaller than that of the main valve body, a pore is bored in the cylindrical wall of the main valve body through which the back pressure chamber of the valve body communicates with an inflow passage from a water supply source.
Since the water stop valve is integrally provided with a drainage channel that is opened and closed by the operation of the operating rod that presses the drain channel, it is possible to provide a water stop valve that exhibits excellent practical effects as described below.

B The water stop valve body is composed of a main valve body and a sub-valve body, which are divided into two parts, and the sub-valve body has a smaller pressure receiving area than the main valve body and is opened in advance, so the load for opening the main valve body during water supply is reduced. Light weight and extremely easy to operate.

The closing speed of the main valve body when water is stopped can be adjusted by controlling the amount of water flowing into the back pressure chamber of the valve body depending on the diameter of the pores.
The valve closing speed can be easily set and the durability of the main valve body can be improved.

C. Since the water stop valve body is a two-piece body consisting of the main valve body and the sub-valve body, it is easy to manufacture, and combined with the above, it is possible to obtain an excellent water stop valve with good durability and reliability.

2. The water stop valve is also equipped with a drainage function, and the drainage channel is opened dynamically when the water is turned off, making it possible to prevent the water inside the heat exchanger from freezing in the winter with a simple single operation.

[Brief explanation of drawings]

The figure is a sectional view of a water stop valve according to an embodiment of the present invention. 1... Water stop valve casing, 2... Water supply inflow channel, 3... Water supply outlet channel, 5... Main valve body, 6... ...Water hole, 7...Pore, 8
...Back pressure chamber, 9...Sub-valve body, 11...
...Operating rod, 12...Drainage channel.

Claims (1)

[Scope of utility model registration request] A cylindrical main valve body with a bottom is provided in the stop valve casing on the side of the inflow path from the valve seat, which opens and closes the valve seat and forms a back pressure chamber together with the casing, and the outflow path is provided on the side of the outflow path from the valve seat. A residue discharge passage is provided branching from the main valve body, and a drainage valve seat is formed in the discharge passage, and the main valve body has a water passage hole at its bottom that communicates the outflow passage with the back pressure chamber. A pore is provided in the cylindrical wall to communicate the inflow channel and the back pressure chamber, and a sub-valve element for opening and closing the water passage hole is provided in the back-pressure chamber and has a pressure receiving area smaller than that of the main valve element. , an operating rod provided with a spring to provide a tendency to close the water passage hole, and facing the main valve element and the auxiliary valve element so as to open the auxiliary valve element before the main valve element; and simultaneously closing the drain valve seat when the sub-valve body opens and closes the drain valve seat,
A water stop valve characterized in that a main valve body and a sub-valve body are pressed by a spring so as to be slidable within a predetermined range so as to open a drain valve seat when closed.