JPS603164Y2 - 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. If the water stop valve body suddenly closes and collides with the valve seat, it may cause water hammer, which may damage the valve body and reduce its durability, or especially if the water supply valve has a so-called hanging sesame type structure. 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, it will require a greater operating force due to abnormally high pressure. It was easy for problems to occur, such as requiring additional work.

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 water stop valve body structure of the above-mentioned one is divided into three parts, and it is structurally complex, and since each valve operates individually, it is difficult to set the water flow interval and minute interval between each valve.
There are drawbacks such as easy variation and poor reliability.

Therefore, the present proposal aims to provide a water stop valve having a practically superior water stop valve element that is structurally simpler, highly reliable, and easy to process.Examples of the water stop valve will be explained below based on the drawings. do.

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 penetrating water hole 6 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 chamber 8 formed by the main valve body and the casing is provided in the cylindrical wall. A pore 7 communicating the channel 2 is provided.

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 at a required speed.

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 pressing 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 addition, this pressing rod is integrated with the sub-valve body in the example shown, but
It may also be formed by a part of a separate operating rod, which will be described later.

Further, this sub-valve body 9 is connected to 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 valve body. Main valve body 5
When the valve seat is closed, a spring 10 is applied from the back pressure chamber 8 side so as to close the water passage hole 6 in advance.

Reference numeral 11 denotes an operating rod which 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 a water supply operation from outside the water stop valve casing 1, and as a specific main operating stage. 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, when the main valve body 5, the sub-valve body 9, the pressing rod 9a, and the operating rod 11 close the water passage hole 6 of the main valve body 5 by the pressure of the spring 10, The main valve body also closes the valve seat 4 by the spring via the sub-valve body, and the pressing rod 9a has a diameter slightly smaller than the diameter of the water passage hole, so that when the water passage hole of the sub-valve body 9 is blocked, the pressure rod 9a closes the valve seat 4. The tip of the main valve body 5 is formed so as to slightly protrude from the bottom of the main valve body 5, and the operating rod 11 is the main valve.

The body pressing portion is formed to have a slightly larger diameter than the water passage hole diameter.

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

The state shown in the figure shows the state when the water is stopped, but when the operation rod 11 is pressed by an appropriate means when water is to be supplied, the tip first presses the pressing rod 9a of the sub-valve body 9 and opens the sub-valve body. Activate.

Since this sub-valve body has a smaller pressure-receiving area than the main valve body, it is not so affected by water pressure and can be opened easily.

Therefore, the sub-valve body 9, which operates before the main valve body 5, opens its water passage hole 6 and allows the water in the back pressure chamber 8 of the main valve body 5 to flow from the water passage hole to the flow channel 3. However, since the back pressure chamber 8 communicates with the inflow passage 2 through the pore 7 of the main valve body 5, the water in the inflow passage will eventually flow to the outflow passage 3, and therefore the water supply pressure will decrease. is purged through the water passage hole 6 and subjected to a depressurizing action.

Therefore, if the operating rod 11 is pressed further, the main valve body 5, which is next to be brought into contact with the main valve body 5, will be easily pressed due to the pressure reduction effect, that is, the valve seat 4 will be disengaged, opening its water passage.
Full water supply to the heat exchanger will begin.

Incidentally, as the main valve body 5 opens, the tip of the operating rod 11 appears to close the water passage hole 6 in the illustrated example, but the main valve body 5 or the operation rod 11 side communicates with the water passage hole 6. It is sufficient to form a water release part such as a groove, and there is no problem with the valve opening operation.

In this way, the water from the outlet passage 3 is supplied to the heat exchanger of the water heater, and in the middle of the process, a water pressure-responsive diaphragm valve that interlocks the gas opening/closing valve of the heating burner is actuated, although it is not shown because it is known. This will cause burner combustion.

Next, when you want to stop the water, release the pressure on the operating rod 11.
First, the auxiliary valve element 9 is pressed against the main valve element 5 by the spring 10 of the back pressure chamber of the main valve element 5, closing the water passage hole 6 and preventing 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. At this time, the back pressure chamber 8 enters a so-called negative pressure state, which prevents the valve closing operation. Since the water supply inflow path 2 is communicated through the pores 7 in the cylinder wall, water flows in through the holes and the valve closing operation is finally completed without being hindered.

The speed at which the valve closes is mainly affected by the elastic force of the spring 10 and the size of the pore 7, but since the hole is a simple through hole, it is easy and free to drill it to any diameter. A desired valve closing speed can be set.

As mentioned above, the water stop valve body of the proposed water stop valve has a bottomed cylindrical shape with a water passage hole in the bottom and a small hole in the cylinder wall through which the back pressure chamber communicates with the water supply inflow channel. It is constructed with two parts: the main valve body and the sub-valve body, which has a smaller pressure-receiving area than the main valve body and opens and closes the water hole before the main valve body, so it has excellent practicality as follows. It is possible to provide a water stop valve that exhibits a desired effect.

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 opens earlier than the main valve body, so when the water supply is opened, The load to open the main valve body is reduced, and even if the water supply pressure becomes abnormally high in a situation where the main valve body is closed, the purge action of the sub-valve body makes operation extremely easy.

Since the main valve body can close slowly, a certain amount of water between the water supply valve and the stop valve can be discharged, and an increase in internal pressure between the water valve and the stop valve can be prevented. It gets even easier.

C. The valve closing speed of the main valve body when water is stopped can be adjusted by controlling the degree of water inflow into the back pressure chamber of the valve body depending on the diameter of the pores, so it is easy to set and easy to process. can improve the durability of

2. Since the water stop valve body is a two-part body and has a simple structure, combined with the above, it is possible to obtain an excellent water stop valve with good reliability.

[Brief explanation of the drawing]

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 path, 5... Main valve body, 6... Water hole, 7... ...Pore, 8...Back pressure chamber, 9...
...Vice valve body.

Claims (1)

[Scope of utility model registration request] A water stop valve body for a water stop valve such as an instantaneous water heater installed in a water supply circuit between a water supply source and a heat exchanger for hot water supply is composed of a main valve body and a sub valve body, where the main valve body has a slidable bottomed cylindrical shape, and its bottom closes the valve seat in the stopcock casing, and the cylinder wall and casing form a back pressure chamber, and the bottom connects the outflow path of the casing with the back pressure chamber. A water passage hole is provided in the cylindrical wall, and a pore is provided in the cylindrical wall to communicate the inflow passage of the casing with the back pressure chamber. The valve body is pressed by a spring to close the hole, and when the valve seat of the main valve body is opened by the operation lever, the sub-valve body is opened before the main valve body through the water passage hole by the operation lever. A water stop valve characterized by: