JP2897178B2 - Check valve - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a non-return valve having a high water-stopping performance, in which a magnet is used at a predetermined portion of the check valve to utilize a magnetic attraction to enhance a water-stopping effect.

[0002]

2. Description of the Related Art In a water supply system, for example, in a public water supply network, the operation of a main valve, a rupture of the main pipe, a large pressure fluctuation (extreme water supply to a part of the piping system due to an stoppage of an additional pump or emergency water intake from a fire hydrant, etc.). Tap water may flow back when pressure drops due to severe water demand.
Due to this backflow, once discharged tap water may be sucked into the water pipe. A check valve is installed in the flow path of tap water to prevent such a phenomenon.

A conventional check valve will be described below with reference to the drawings. FIG. 8 is a layout view of a water supply system provided with the present invention and a conventional check valve, and FIG. 14 is a front sectional view of the conventional check valve. As shown in FIG.
Is provided with a valve body 211, an arm suspension 26, and a lid 22 on an upper part of the valve body. Furthermore, the flow path 1 of the valve body 211
0, a horizontal swing valve shaft 5 orthogonal to the flow path 10
It has an arm 25 suspended from zero. This arm 25 has a frame 2 fitted with a sheet packing 27.
3 is a vertical inner surface of the flow path 10 and the sheet packing 2
The nut 7 is loosely fitted with the nut 4 so that the nut 7 can freely come and go. The portion that comes into contact with and separates from the seat packing 27 is the seat surface 12, and the seat surface 12 is
11. The arm 25 is attached to the valve body 211 by fitting an arm suspension 26 in which the swing valve shaft 50 on the upper side is fitted into a concave portion on the valve body 211. The upper part of the valve body 211 is sealed by a lid 22. Further, the valve body 2
Both ends of the flow path 10 are connected to a water pipe. FIG. 14 shows the state during the water stopping operation.

[0004] In the water supply system shown in FIG.
A meter 71 and a water stopcock 70 are provided on the water main P side (primary side). That is, in the ground, a water stopcock 70, a meter 71, and a check valve 21 are arranged in the water pipe 73 in this order from the primary side. When water is flowing, 1
Due to the water pressure (water flow S) on the next side, the top 23 loosely fitted to the arm 25 is moved to the swing valve shaft 5 above the arm 25.
It is pushed up to the upper part inside the valve main body 211 around 0. Therefore, the flow path 10 in the valve main body 211 is in a water-permeable state. And the tap water on the primary side is the check valve 2
1 to the faucet 72 side (secondary side).

[0005] In the water supply system, the secondary side tap water tries to enter the check valve 21 by the suction force due to the above-mentioned backflow factor. The top 23 loosely fitted to the arm 25 is moved by the suction force between the seat packing 27 of the top 23 and the flow path 10 of the valve body 211 around a swing valve shaft 50 on the upper part of the arm 25. It is pulled until the vertical inner surface, that is, the sheet surface 12, comes into contact. Therefore, the flow path 10 is closed by the top 23, and the tap water on the secondary side does not flow back to the primary side. At this time, the forces that bring the top 23 into contact with the sheet surface 12 are only the suction force caused by the backflow of tap water and the gravity acting on the top 23 and the arm 25.

[0006]

As described above, the water stopping effect of the conventional check valve due to the contact between the top and seat surfaces of the check valve is substantially due to the suction force of the backflow factor of tap water and the gravity acting on the top and arm. Was only. As described above, the water stopping action in the prior art is substantially only due to the suction force and the gravity acting on the top and the arm, and therefore, a sufficient water stopping action cannot be obtained. Backflow from the space between the seat packing fitted to the sheet and the sheet surface to the primary side. The present invention has been made under such circumstances,
It provides a check valve with high water-stop performance, with strong adhesion between the seat packing attached to the top and the seat surface.

[0007]

According to the present invention, a predetermined portion of a check valve is provided with at least one pair of magnets whose polarities are matched so as to attract each other, or the magnets are easily attracted to the magnetic attraction of the magnets. It is characterized by having a substance such as a magnetic substance. The adhesion between the sheet packing fitted to the top and the sheet surface is enhanced by using magnetic attraction. The check valve of the present invention is a valve body having a flow path, an arm suspension formed inside the valve body, a lid mounted on the valve body upper part that seals the arm suspension and the valve body. An arm that is integrally hung on a swing valve shaft about a horizontal axis orthogonal to the flow path, a top loosely fitted to the arm, and a seat packing fitted to the top, The arm is
An upper end of the arm above the swing valve shaft, wherein a seat packing fitted to the piece loosely fitted thereto is brought into contact with and separated from the vertical inner surface of the valve body. A first feature is that a pair of magnets or magnets and magnets whose polarities are matched so as to attract each other are embedded in a predetermined portion of the arm suspension that is close to the upper end and at the time of the water stopping operation. I do. Further, the check valve of the present invention is mounted on a valve body having a flow path, an arm suspension formed inside the valve body, and an upper part of the valve body for sealing the arm suspension and the valve body. A lid, an arm integrally suspended from a swing valve shaft about a horizontal axis orthogonal to the flow path, a top loosely fitted to the arm, and a seat packing fitted to the top. The arm is contacted so that a seat packing fitted to the top loosely fitted to the top can freely contact and separate from a vertical inner surface of the valve body, and the arm is in contact with the vertical inner surface of the valve body of the top. Out of the opposing surface
At least one magnet is provided at a position inside the seat packing or at a predetermined area of the arm,
A second feature is that a magnet or a magnetic body is provided in a portion including the vertical inner surface of the valve body. Magnet of top
Of the surface opposite to the valve body vertical inner surface of the seat packing
So that it is located on the inside, or
To face other magnets or magnetic materials
(See FIG. 9), the magnet and other magnets
The stone or magnetic material is not in contact.

[0008]

Embodiments of the present invention will be described below in detail with reference to the drawings. First, the structure of the check valve according to the first embodiment of the present invention is shown in FIGS. FIG.
Front sectional view of a check valve, FIG. 2 is a right side sectional view of a check valve,
3 is a plan view and a right side view of the check valve, FIG. 4 is a front view and a side view of the arm, FIG. 5 is a plan view, a front view and a bottom view of the arm suspension, and FIG. It is the front view, the top view, and the left side view which show the state which attached the arm which loosely fit the top.

The check valve 1 according to the present invention comprises a valve body 11 having a flow path 10 at both ends to which a water pipe is connected, and an arm suspension 6.
And a lid 2 for sealing the arm suspension 6 formed in the valve body 11. The valve body 11 has an arm 5 attached to the arm suspension 6.
And a top 3 which is loosely fitted by a nut 4 to a ring-shaped portion (see FIG. 4) provided at a lower portion of the arm 5 and in which a seat packing 7 is fitted. Further, an O-ring packing 8 for stopping water is fitted to the upper inside of the lid 2 (FIGS. 1 to 3). A swing valve shaft 51 having a horizontal axis perpendicular to the flow path 10 as a center is provided on the upper portion of the arm 5 (FIG. 4).
The swing valve shaft 51 is attached to the arm suspension 6 by fitting it into the recess 61 of the arm suspension 6 (FIG. 6). The top 3 on which the seat packing 7 is fitted and the vertical inner surface (seat surface 12) of the valve main body 11 can be freely moved about the pivot valve shaft 51 as a fulcrum. The first magnet 9 is embedded in the first magnet holder 13 at the upper end of the swing valve shaft 51 of the arm 5. In addition, arm suspension 6
The first magnet holder 13 of the arm 5 and the second magnet holder 14 existing in a portion including a vertical surface which are close to each other when the water is stopped when the top 3 is in contact with the sheet surface 12 are provided with a second magnet. 91 is embedded. The first magnet 9 and the second magnet 91 are matched in polarity so as to attract each other (FIGS. 1, 4 to 6). Instead of one of the first and second magnets, a magnetic material selected from iron, cobalt, nickel, or an alloy thereof may be used.

Next, with reference to FIG. 7 and FIG. 8, the operation of the check valve of the present invention at the time of passing water and at the time of stopping water will be described. FIG. 7A shows an operation (normal operation) at the time of flowing water, and FIG.
Is a diagram showing an operation at the time of water stoppage, and FIG. 8 is a layout diagram of a water supply system provided with the present invention and a conventional check valve.

As shown in FIG. 8, a meter 71 and a water stopcock 70 are provided on the water main P side (primary side) of the check valve 1. At the time of passing water, the top 3 loosely fitted to the arm 5 by the water pressure (water flow S) of the tap water on the primary side from the check valve 1,
It is pushed up inside the valve body 11 around the swing valve shaft 51 at the upper part of the arm 5. Therefore, the flow path 10 in the valve body 11 is in a water-flowing state, and the tap water on the primary side is supplied from the check valve 1 to the secondary side. At this time, the first magnet 9 embedded in the first magnet holder 13 and the second magnet 91 embedded in the second magnet holder are separated from each other about the swing valve shaft 51. The magnetic attraction between the two magnets is weak and substantially equal to zero, and the two magnets are not attracted to each other (FIG. 7A).

When the water stops, tap water on the secondary side attempts to enter the valve body 11 due to the suction force caused by the backflow, and the top 3 loosely fitted to the arm 5 swings on the upper portion of the arm 5 by the suction force. Seat packing 7 of top 3 around valve shaft 51
And the sheet surface 12 are pulled until they come into contact with each other. Therefore,
The flow path 10 is closed by the top 3, and the tap water on the secondary side does not flow back to the primary side of the check valve 1. At this time, the first magnet holder 13 moves to a position close to the second magnet holder 14 around the swing valve shaft 51. Since the magnetic attraction between both the first magnet 9 and the second magnet 91 becomes stronger as they approach, the top 3 that moves in the opposite direction to the first magnet holder 13 about the swing valve shaft 51 as a fulcrum.
The adhesion between the sheet and the sheet surface 12 is enhanced by the magnetic attraction between the two magnets.

Next, a second embodiment of the present invention will be described.
This embodiment is shown in FIGS. 9 is a front cross-sectional view of the check valve of the present embodiment, FIG. 10 is a front partial cross-sectional view and a left side view of a piece loosely fitted to an arm, and FIG. 11 is an arm suspension plan view, a front cross-sectional view, and FIG. Bottom view, FIG. 12 is a front partial sectional view, a plan view, and a left side view showing a state where an arm and a top are attached to an arm suspension, and FIG. 13 is a flow-through operation and a water-stop operation of a check valve of this embodiment. FIG.

The check valve of the present embodiment comprises a valve body 11 having a flow path 10 at both ends to which a water pipe is connected, and an arm suspension 6.
And a lid 2 for sealing the arm suspension 6 in the valve body 11. In addition, the valve body 11 includes:
The arm 5 attached to the arm suspension 6 and the top 3 fitted with a sheet packing 74, which is loosely fitted by a nut 4 to a ring-shaped portion (see FIG. 4) provided below the arm 5, are housed. Have been. Further, an O-ring packing 8 for stopping water is fitted to the upper inside of the lid 2. An upper portion of the arm 5 is provided with a swing valve shaft 51 centered on a horizontal axis orthogonal to the flow path 10, and the swing valve shaft 51 is fitted into the concave portion 61 of the arm suspension 6. The arm 5 is attached to the arm suspension 6. Further, the top 3 fitted with the seat packing 74 and the vertical inner surface (seat surface 12) of the valve body 11 are configured to be able to freely contact and separate with the pivot valve shaft 51 as a fulcrum (FIGS. 9 to 12). ). As shown in FIGS. 9 and 10, the first magnet 92 is mounted on the top 3 so as to be located inside the sheet packing 74. In addition, as a material of the sheet 93 having the sheet surface 12, a material such as a magnet or a magnetic material which easily reacts to magnetic attraction is used, and a magnet (ie, a second magnet) is used.
When using, the polarity is adjusted so as to attract the first magnet 92.

As described above, as shown in FIG.
On the water main P side (primary side), a water pipe 73 is provided with a meter 71 and a water stopcock 70. Normally (at the time of passing water), since the top 3 and the sheet 93 are separated by the flow force of the water flow S, the magnetic attraction between the first magnet 92 and the sheet 93 is weak and does not attract each other (FIG. 13).
(A)).

When the water stops, tap water on the secondary side attempts to enter the valve body 11 due to the suction force caused by the backflow, and the top 3 loosely fitted to the arm 5 swings on the upper portion of the arm 5 by the suction force. Seat packing 7 of top 3 around valve shaft 51
4 and the sheet surface 12 are pulled until they come into contact. Therefore, the flow path 10 is closed by the top 3, and the tap water on the secondary side does not flow back to the primary side of the check valve 1. At this time, the top 3 and the sheet surface 12 are moved by the magnetic attraction of the first magnet 92 and the sheet 93 using a substance such as a magnetic material.
(FIG. 13B) When the sheet 93 is a magnet, the first water blocking effect can be obtained.
A magnetic substance can be used in place of the magnet. The magnet may be a ferrite magnet, a rubber magnet, a magnet in which magnetic powder is dispersed in a resin, or the like, in addition to a metal or alloy alloy. Further, the number of magnets and magnetic bodies is not limited to one, and the effect of magnetic attraction can be enhanced by using a plurality of magnets and magnetic bodies.

[0017]

According to the present invention, two magnets which attract each other are buried in a predetermined portion of a check valve, or a magnet or a substance which is easily attracted to magnetic attraction is used in a predetermined portion. By strengthening the adhesion between the seat packing fitted to the top and the seat surface, it has become possible to provide a check valve with higher water stopping performance than before.

[Brief description of the drawings]

FIG. 1 is a front sectional view of a check valve according to the present invention.

FIG. 2 is a right side sectional view of a check valve according to the present invention.

FIG. 3 is a plan view and a right side view of a check valve according to the present invention.

FIG. 4 is a front view and a left side view of an arm constituting the check valve of the present invention.

FIG. 5 is a plan view of an arm suspension constituting the check valve of the present invention;
Front sectional view and bottom view.

FIG. 6 is a front view, a plan view, and a left side view of the check valve according to the present invention in which an arm having a piece loosely fitted is attached to the arm suspension of the check valve;

FIG. 7 is a front cross-sectional view showing a water passing operation and a water stopping operation of the check valve of the present invention.

FIG. 8 is a layout view in which the present invention and a conventional check valve are arranged in a water supply system.

FIG. 9 is a front sectional view of the check valve of the present invention.

FIG. 10 is a front sectional view and a left side view of a top which is loosely fitted to the arm of the check valve of the present invention.

FIG. 11 is a plan view, a front sectional view, and a bottom view of an arm suspension of the check valve of the present invention.

FIG. 12 is a front partial cross-sectional view, a plan view, and a left side view in which an arm in which a top is loosely fitted is attached to the arm suspension of the check valve of the present invention.

FIG. 13 is a front cross-sectional view showing a water passing operation and a water stopping operation of the check valve of the present invention.

FIG. 14 is a front sectional view of a conventional check valve.

[Explanation of symbols]

1 ... check valve, 2 ... lid, 3 ... top,
4 ... nut, 5 ... arm, 6 ... arm suspension, 7, 74 ... sheet packing, 8 ...
-O-ring packing, 9, 92 ... 1st magnet, 1
0 ... flow path, 11 ... valve body, 12 ... seat surface, 13 ... first magnet holder part, 14 ...
2nd magnet holder part, 51 ... swing valve shaft, 61
··· Recess, 70 · •••••••••••••••••••••••••••••••••••••••••••••••• ·······
1 ... second magnet, 93 ... sheet.

──────────────────────────────────────────────────続 き Continued on the front page (58) Field surveyed (Int.Cl. ⁶ , DB name) F16K 15/03 F16K 1/20 F16K 31/06 305 F16K 31/08

Claims (2)

(57) [Claims] A valve body having a flow path; an arm suspension formed inside the valve body; a lid mounted on an upper part of the valve body for sealing the arm suspension and the valve body; An arm suspended integrally with a swing valve shaft centered on a horizontal axis orthogonal to the road, a top loosely fitted to the arm, and a seat packing fitted to the top, the arm comprising: An upper end of the arm above the swing valve shaft, wherein a seat packing fitted to the piece loosely fitted thereto is brought into contact with and separated from the vertical inner surface of the valve body. A pair of magnets or a pair of magnets and magnets whose polarities are matched so as to attract each other are embedded in a predetermined portion of the arm suspension which is close to the upper end and at the time of the water stopping operation. valve. A valve body having a flow path, an arm suspension formed inside the valve body, a lid mounted on an upper part of the valve body for sealing the arm suspension and the valve body, An arm suspended from a swing valve shaft centered on a horizontal axis perpendicular to the road, a top loosely fitted to the arm, and a seat packing fitted to the top, the arm comprising: sheet packing that is fitted into the frame, which is loosely fitted thereto are sitting so as to be freely separable vertically inner surface of said valve body, said one of the opposing surfaces of the valve body vertical inner surface of the frame A check valve, wherein at least one magnet is provided at a position inside a seat packing or at a predetermined region of the arm, and a magnet or a magnetic body is provided at a portion including the vertical inner surface of the valve body.