JP2000110949A - Antifreezing drain cock - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide an antifreezing drain cock to perform water bleeding operation certainly without causing the operator to have hallucination in terms of manipulation of making water bleeding. SOLUTION: A bonnet 3 is fixed to a valve body 1 opened and closed by a main valve element 13, and a first stem 5 is mounted on the bonnet 3 rotatably, and a second stem 9 interlocking with the rotation of the first stem 5 is installed inside the bonnet 3 in such a way as capable of elevating and sinking. At the lower part of the second stem 9 the main valve element 13 is supported movable relative to the second stem 9, and a compression spring 15 is interposed between the main valve element 13 and the first stem 5, and a drain port 18 formed in the bonnet 3 is blocked by a drain valve element 17 energized by a compression spring 19 mounted on the main valve element 13. The water drain valve element 17 is an antifreezing drain cock which opens the exhaust port 18 in association with the second stem 9 moving in the direction toward a valve seat 2.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an antifreeze water spout, and more particularly to an antifreeze water spout having a drainage structure for preventing freezing used for water supply, industrial water supply or other water supply.

[0002]

2. Description of the Related Art This type of water drainage plug is known to have a water drainage structure for discharging water in a downstream rising pipe to the outside when a valve is closed to prevent freezing (for example, Japanese Utility Model Publication No. 59-59). No. 2212). In the antifreeze faucet according to the publication, a stopper having a drainage mechanism is fixed to a drainage body, and a main valve body can be freely opened and closed via a main valve spring at a lower end of a stem screwed to a center portion of the stopper. The drain valve, which is provided coaxially with the stem, is provided with a drain opening mechanism that allows the drain port of the drain mechanism to be opened and closed freely. , The drain valve body is lowered against the drain spring to perform the draining operation.

In this case, at the time of opening the drain valve from the intermediate water stop where both the main valve and the drain valve are in the water stop state,
When the stem is lowered to open the drain valve body, it is necessary to forcibly press the main valve body by increasing the urging force of the main valve spring so that the main valve body can stop water against the water pressure.

[0004]

However, according to the structure of the conventional antifreeze faucet, the main valve spring is moved by the descending stroke of the stem from the above-mentioned intermediate water stop state to the opening of the drain valve body. Need to be further compressed, the operating torque of the stem suddenly increases, and it is easy for the user to illusion that the draining operation has been completed, and as a result,
The drainage of the antifreeze faucet was incomplete, and there was a risk of freezing.

Further, in recent years, with the spread of the direct water supply system,
In order to ensure the safety of tap water, a check valve mechanism is often installed in this direct water supply system. However, since water pressure is sealed in the indoor piping after the check valve mechanism is installed, in a cold region, if the drainage operation is incomplete,
The water expands due to freezing, and the water pressure increases. At this time, when the conventional antifreeze plug is operated, the water in the pipe is further compressed to cause abnormal pressure rise, which may cause damage to the antifreeze plug itself and other piping equipment.

[0006] The present invention has been developed in view of the above-mentioned circumstances, and an object of the present invention is to provide a reliable drainage operation without causing the user to have an illusion of operation during the drainage operation. An object of the present invention is to provide an antifreeze water stopper that can be performed.

[0007]

In order to achieve the above object, according to the first aspect of the present invention, a bonnet is fixed to a valve body which is opened and closed by a main valve body, and a first stem is rotatably provided on the bonnet. The second which is linked to the rotation of the first stem
A stem is provided inside the bonnet so as to be movable up and down, a lower portion of the second stem supports a main valve body movably with respect to the second stem, and a compression spring is provided between the main valve body and the first stem. And a drain port formed in the bonnet is closed by a drain valve element urged by a compression spring mounted below the main valve element or the second stem. This is an antifreeze water stopper in which the drain port is opened as the second stem further moves in the valve seat direction after sitting on the seat.

According to a second aspect of the present invention, a bonnet is fixed to a valve body which is opened and closed by a main valve body, and a first stem is rotatably provided on the bonnet, and a second stem which is interlocked with the rotation of the first stem. A stem is provided inside the bonnet so as to be able to move up and down. The second stem is provided with a vertically movable main valve body and a vertically movable drain valve body. A weak compression spring is provided on the bonnet or the first and second stems. The second stem is further moved in the direction of the valve seat on the main valve body side after the main valve body is seated on the valve seat, and the strong compression spring is mounted between the main valve body and the drain valve body. This is an antifreeze water stopper that opens a drain port formed in the bonnet.

[0009]

BEST MODE FOR CARRYING OUT THE INVENTION A preferred embodiment of an antifreeze water stopper according to the present invention will be described. FIG. 1 is a longitudinal sectional view showing the state of the antifreeze water drain plug at the time of intermediate water stoppage, FIG. 2 shows the state at the time of passing water, and FIG. 3 shows the state at the time of drainage. 1 in the figure
Is a valve body, and pipe connection portions 1a, 1 are provided at both ends of the valve body 1.
b, and the valve seat 2 is provided in the main flow path. The male screw 3a of the bonnet 3 is screwed into the screw 1c to be provided on the upper part of the valve body 1, and the bonnet 3 is connected to the valve body 1 via the gasket 4.
Is fixed.

Further, the first portion from the upper central portion of the bonnet 3
The stem 5 is inserted, the first stem 5 is rotatably provided in the bonnet 3 via the O-ring 6, the handle 7 is fixed to the upper end of the first stem 5, and serration processing or the like is provided below the first stem 5. Is provided.

The lower portion of the first stem 5 is inserted from above the second stem 9 having a cylindrical shape, and the inner peripheral surface of the opening of the second stem 9 is subjected to serration or the like to provide an engaging portion 10. The second stem 9 is slidably rotated with the rotation of the first stem 5 by locking the portion 10 with the locking portion 8 of the first stem 5. Further, a male screw 9b formed on the outer peripheral surface of the second stem 9 is screwed into the female screw 3b of the bonnet 3 so as to be moved up and down while rotating the second stem 9.

The lower end of the second stem 9 has a retaining ring 11.
The main valve holder 12 is slidably supported through the main valve body 12, the main valve body 13 is screwed to the main valve holder 12, and the main valve body 13 is connected to the valve seat 2 through the packing 14 provided on the main valve body 13. , And a strong compression spring 15 is mounted between the lower surface of the first stem 5 and the main valve body 13 to resilient the main valve body 13 in the direction of the valve seat 2.

Further, a drain valve 17 having a packing 16 is slidably fitted to and supported by the second stem 9 at a position above the main valve 13.

A drain valve 17 is opposed to a drain port 18 provided on the lower surface of the bonnet 3, and the elastic force of a weak compression spring 19 mounted between the main valve 13 and the drain valve 17. The drainage port 18 is closed via the packing 16 of the drainage valve body 17, and the pressing engagement portion 20 formed in the middle of the second stem 9 is further moved after the main valve body 13 is seated on the valve seat 2. When the valve descends, the drain valve 17 is pressed to push down the drain valve 17 and the drain port 18 is opened.

Further, a check valve 22 is provided in the middle of the flow path 18 a of the drain outlet 21 communicating with the drain port 18 of the bonnet 3, and the check valve 22 is built in with a plug 23.

A cover 24 covers the outer peripheral surface of the bonnet 3.
The cover 24 is screwed to the valve body 1, and a drain hole 25 is formed at an appropriate position of the screwed portion to allow drainage to flow to the outside. In the figure, 26 is the first stem 5
The retaining ring 5a for preventing fall of the first stem 5 is a collar portion for retaining formed in the middle of the first stem 5.

Next, the operation of the above embodiment will be described.
As shown in FIG. 2, when the main valve 13 is separated from the valve seat 2 of the valve body 1 during water flow, when the handle 7 is rotated, the first stem 5 rotates and serration processing is performed. The second stem 9 which is rotated by the locking portion 8 and the engaging portion 10 of the main valve body 1 which is lowered in the valve seat direction while screwing the inside of the bonnet 3 and is resiliently supported by the compression spring 15.
The seat 3 is seated on the valve seat 2 and enters an intermediate water stop state as shown in FIG. 1. In this case, the compression spring 15 extends to the intermediate water stop and operates in a direction to reduce the operating torque. I do.

Next, in order to set the drainage state from the intermediate water stop state in FIG. 1, when the handle 7 is further rotated, the second stem 9 further descends in the valve seat direction, and the pressing force of the second stem 9 is reduced. The joint 20 pushes the drain valve body 17 to move in the valve seat direction, and the second stem 9 slides down into the main valve body 13 so that the compression spring 15 is compressed. Instead, only the compression spring 19 is compressed, the drain valve body 17 is separated from the drain port 18 to open the drain port 18, and through the drain port 18 through the flow path 18a, the check valve 22 is opened to release the drain port 21. From the drain hole 25 to the outside. In this case, the compression spring 15 keeps the state of the intermediate water stop and compresses only the weak compression spring 19, so that the drainage can be reliably performed with a low torque and no erroneous operation is performed.

On the other hand, when the first stem 5 is rotated in the reverse direction,
When the drain valve element 17 closes the drain port 18 to achieve an intermediate water stop state, and the first stem 5 is further rotated in the reverse direction, the water flow state shown in FIG. 2 can be obtained. At this time, compression spring 1
5, the operating torque increases. In this example, the compression spring 15 is provided between the first stem 5 and the main valve body 13. It may be provided.

FIG. 4 shows another example of the antifreeze water stopper according to the present invention, and the same parts as those in the above example are denoted by the same reference numerals. According to the drawing, a compression spring 27 is added between the second stem 9 and the main valve body 13 and is arranged in parallel with the compression spring 15 so that the second stem 9 is lowered until the drain valve body 17 is opened. Sometimes, only the compression spring 27 is compressed, and when the second stem 9 is raised, only the compression spring 15 is compressed. This has the effect of halving the axial load reflected on the operating torque, and in particular, a large-diameter drain valve can be used. The effect is great.

FIG. 5 shows still another example of the antifreeze water stopper according to the present invention, and the same parts as those in the above example are denoted by the same reference numerals. According to the figure, the main valve 13 is secured to the second stem 9 so as to be movable up and down, and a weak compression spring 28 is mounted between the bonnet 3 or the first stem 5 and the second stem 9. A strong compression spring 29 is mounted between the drain valve elements 17, and the drain valve element 17 is
After the main valve body 13 is seated on the valve seat 2 due to the lowering of the valve body, the pressing engagement portion 20 pushes down the drain valve body 17 as the second stem 9 further moves in the valve seat direction on the main valve body 13 side. The drain port 18 formed in the bonnet 3 is opened.

In this case, the compression spring 29 may be divided into a compression spring 30 provided between the second stem 9 and the main valve body 13 in addition to the spring 29, but the compression spring 29 can function sufficiently. In this case, it is not necessary to provide the compression spring 30. The function of the compression spring 28 is to assist the lowering of the second stem 9, and in particular, to assist the lowering of the second stem 9 when the second stem 9 is lowered by the intermediate water stop, thereby operating the compression spring 29 or 29, 30. The force is reduced, and the other effects are the same as those in the above example.

In addition, in addition to the above embodiments, the first stem and the second stem may be provided so as to be able to advance and retreat by screwing, and the second stem is prevented from rotating around the bonnet so as to advance and retreat the second stem. good.

[0024]

As is apparent from the above description, according to the present invention, the structure is such that the operating torque is suppressed to a low level by eliminating a sudden increase in the operating torque, so that the water draining operation can be performed without erroneous operation by the user. It can be performed reliably.

Also, even if the water freezes without performing the draining operation, the draining operation can be performed without compressing the water in the indoor piping after the check valve mechanism in the direct water supply system, and It is possible to prevent the defrosting of the antifreeze water and the damage of other piping devices due to the pressure increase.

[Brief description of the drawings]

FIG. 1 is a longitudinal sectional view showing a state at the time of an intermediate stoppage of antifreeze water tapping in the present invention.

FIG. 2 is a longitudinal sectional view showing a structure in a state when water is passed from FIG.

FIG. 3 is a longitudinal sectional view showing a structure in a state of drainage from FIG.

FIG. 4 is a partial vertical sectional view showing another example of the antifreeze water stopper according to the present invention.

FIG. 5 is a partial vertical sectional view showing still another example of the antifreeze water stopper according to the present invention.

FIG. 6 is a partially cutaway front view of a first stem.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 Valve main body 2 Valve seat 3 Bonnet 5 1st stem 7 Handle 8 Locking part 9 2nd stem 10 Engaging part 13 Main valve body 15 Compression spring 17 Drainage valve body 18 Drainage port 19, 28, 29, 30 Compression spring

Claims (2)

[Claims] 1. A bonnet is fixed to a valve body which is opened and closed by a main valve body, a first stem is rotatably provided on the bonnet, and a second stem interlocked with the rotation of the first stem is moved up and down inside the bonnet. The main valve body is movably supported with respect to the second stem below the second stem, and a compression spring is interposed between the main valve body and the first stem. The formed drain port is closed by a drain valve urged by a compression spring mounted below the main valve element or the second stem, and the drain valve element is connected to the second stem after the main valve element is seated on the valve seat. The drain port is opened as the further moves in the direction of the valve seat on the main valve body side. 2. A bonnet is fixed to a valve body which is opened and closed by a main valve body, a first stem is rotatably provided on the bonnet, and a second stem interlocked with the rotation of the first stem is moved up and down inside the bonnet. Movably provided and provided with a vertically movable main valve body and a vertically movable drain valve body which are prevented from falling off the second stem,
A weak compression spring is mounted on the bonnet or the first stem and the second stem, and a strong compression spring is mounted between the main valve body and the drain valve body. The drain valve body is in the second position after the main valve body is seated on the valve seat. An antifreeze water tap, characterized in that a drain port formed in a bonnet is opened as the stem further moves in a valve seat direction on a main valve body side.