JP2004028283A - Three-way valve - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a three-way valve preventing nonconformity such that foreign matters intrude into spaces communicated with valve casing seats from respective first-third opening parts of a valve element and damage the valve casing seats, when the valve element is changed over into each changeover position. <P>SOLUTION: The valve element 6 is provided with a pair of disk members 30a and 30b, the inside of the valve casing 2 is formed with ringed first-third projections 31-33, and when the valve element is changed over to a first full opened changeover position A, a part of the space S1 communicating from the first opening part 8 of the valve element 6 to the both valve casing seats 12a and 12b is blocked by the first projection part 31. When the valve element 6 is changed over to a second unilaterally closed changeover position, one disk member 30a fits in the third projection part 33 to block the space communicating from the second and the third opening parts 9 and 10 to the other valve casing seat 12b and the other disk member 30b fits in the second projection part 32 to block the space communicating from the second and the third opening parts 9 and 10 to one valve casing seat 12a. <P>COPYRIGHT: (C)2004,JPO

Description

[0001]
TECHNICAL FIELD OF THE INVENTION
The present invention has first to third entrances, a first fully open switching position for opening all the first to third entrances, a second half-closed switching position for closing only the second entrance, and a third entrance. The present invention relates to a three-way valve that can be switched to a third one-side switching position in which only the third valve is closed.
[0002]
[Prior art]
Conventionally, as this type of three-way valve, there is, for example, one shown in FIGS. That is, the first to third entrances 3 to 5 are formed in the valve box 2 of the three-way valve 1. Inside the valve box 2, a first fully open switching position A (see FIG. 11) in which all of the first to third ports 3 to 5 are open, and a second one-side closed switching position B in which only the second inlet 4 is closed. (See FIG. 12) and a third one-side closed switching position C (see FIG. 13) in which only the third entrance 5 is closed is provided with a rotatable valve body 6. The valve body 6 is provided with a rotatable valve rod 7, and an operation handle (not shown) or the like is attached to a distal end of the valve rod 7 via a speed reducer (not shown). When the operator turns the operating handle, the valve rod 7 rotates, and the valve body 6 rotates around the rotation axis 16 and is switched to the above-described switching positions A to C.
[0003]
As shown in FIG. 11, in the valve element 6, at the first fully-open switching position A, a cylindrical first opening 8 that opens to the first entrance 3 and a second opening 4 A second cylindrical opening 9 that opens to the outside and a third cylindrical opening 10 that opens to the third entrance 5 are formed. In the valve element 6, a T-shaped valve element channel 11 communicating with the first to third openings 8 to 10 is formed.
[0004]
On the side of the second doorway 4 in the valve box 2, one ring-shaped valve box sheet 12 a centering on the flow axis 4 a of the second doorway 4 is provided, and the inside of the valve box 2 is provided. On the third doorway 5 side, another ring-shaped valve box sheet 12b centering on the flow path axis 5a of the third doorway 5 is provided.
[0005]
When the valve body 6 is switched to the second one-closed switching position B (see FIG. 12), the valve body 6 is pressed against the one valve box sheet 12a and switched to the third one-closed switching position C (see FIG. 13). In this case, a valve body sheet 14 which is pressed against the other valve box sheet 12b is attached via bolts and nuts 15. As shown in FIG. 14, the valve body sheet 14 is formed in a circular dish shape having an inclined portion 14 a at a peripheral portion, and is located on the opposite side of the first opening 8.
[0006]
A pipe (not shown) is connected to each of the first to third entrances 3 to 5.
According to this, when the operator turns the operating handle to switch the valve body 6 to the first fully open switching position A as shown in FIG. 11, the first opening 8 is connected to the first entrance 3. And the second opening 9 opens to the second entrance 4 and the third opening 10 opens to the third entrance 5. Doors 3-5 are opened. As a result, the fluid (such as city gas) flowing from the second and third ports 4 and 5 is discharged from the first port 3 through the valve body flow path 11.
[0007]
In addition, as shown in FIG. 12, when the valve body 6 is switched to the second one-side switching position B, the first opening 8 opens to the third entrance 5 and the second opening 9 Is opened to the first entrance 3 so that the first entrance 3 and the third entrance 5 are opened. At this time, since the inclined portion 14a of the valve body sheet 14 is pressed against the sealing surface 13 of the one valve box sheet 12a, the second entrance 4 is closed and sealed watertight. Thereby, the fluid flowing in from the third port 5 is discharged from the first port 3 through the valve body channel 11.
[0008]
Similarly, as shown in FIG. 13, when the valve element 6 is switched to the third one-closed switching position C, the first entrance 3 and the second entrance 4 are opened. At this time, since the inclined portion 14a of the valve body sheet 14 comes into pressure contact with the sealing surface 13 of the other valve box sheet 12b, the third entrance 5 is closed and sealed watertight. Thereby, the fluid flowing in from the second port 4 is discharged from the first port 3 through the valve body channel 11.
[0009]
[Problems to be solved by the invention]
However, in the above-mentioned conventional type, as shown in FIGS. 11 and 14, when the valve body 6 is switched to the first fully open switching position A, foreign matter (weld slag, etc.) existing in the pipe or fluid is removed from the valve body. 6 may enter the space S1 communicating with the sealing surfaces 13 of the valve box sheets 12a and 12b from the first opening 8 and damage the sealing surfaces 13 of the valve box sheets 12a and 12b.
[0010]
As shown in FIGS. 12 and 15, when the valve element 6 is switched to the second one-closed switching position B, the foreign matter passes through the second and third openings 9 and 10 of the valve element 6 and the other valve. There is a risk that the liquid may enter the space S2 communicating with the sealing surface 13 of the box sheet 12b and damage the sealing surface 13 of the other valve box sheet 12b. Further, as shown in FIG. 16, the foreign matter enters the space S3 communicating with the sealing surface 13 of the one valve box sheet 12a from the second and third openings 9 and 10 of the valve body 6, and the one valve box There is a possibility that the sealing surface 13 of the sheet 12a may be damaged.
[0011]
In addition, as shown in FIG. 13, when the valve element 6 is switched to the third one-closed switching position C, similarly, the foreign matter is transmitted from the second and third openings 9 and 10 of the valve element 6 to one valve. There is a possibility that the liquid may enter the space S3 communicating with the sealing surface 13 of the box sheet 12a and damage the sealing surface 13 of the one valve box sheet 12a. Further, the foreign matter enters the space S2 communicating with the sealing surface 13 of the other valve box sheet 12b from the second and third openings 9 and 10 of the valve body 6, and the sealing surface 13 of the other valve box sheet 12b is removed. There was a risk of injury.
[0012]
The present invention prevents a problem that, when the valve body is switched to each switching position, foreign matter enters the space communicating with the valve box sheet from each of the first to third openings of the valve body and damages the valve box sheet. It is intended to provide a three-way valve that can be used.
[0013]
[Means for Solving the Problems]
In order to achieve the above object, the present invention provides a valve box having first to third ports, and a first fully-open switching position and a second port in which all of the first to third ports are opened in the valve box. A three-way valve having a rotatable valve body between a second one-closed switching position in which only the entrance is closed and a third one-closed switching position in which only the third entrance is closed. A first opening that opens to the first entrance, a second opening that opens to the second entrance, and a third opening that opens to the third entrance are formed in the valve body. One of the ring-shaped valve box sheets is provided on the second port side of the valve box around the flow path axis of the second port, and the third port is provided on the third port side. The other ring-shaped valve box sheet is provided around the axis of the flow path, and a pair of disc members and a second half A valve body sheet that is pressed against the one valve box sheet when switching to the switching position and is pressed against the other valve box sheet when switching to the third one-side switching position; Is formed around the flow path axis of the first opening, and one disk member is disposed on the first opening side and the other disk member is disposed on the opposite side of the first opening. The second opening and the third opening are located between the disc members, and ring-shaped first to third projections are formed on the inner surface of the valve box, and the first projection is formed. When the valve body is switched to the first fully open switching position around the flow path axis of the first inlet / outlet, the valve body projects between the tip of the first opening of the valve body and the inner surface of the valve box. , The space communicating with the two valve box seats from the first opening is narrowed, and the second and third projections are formed in the second and third projections. When the valve element is switched to the second one-side closed switching position with the center of the flow path axis of the inlet and outlet and between the two valve box sheets, one of the disk members is the inner periphery of the third protrusion. Side, the space communicating with the other valve box seat from the second and third openings is narrowed, and the other disk member is fitted into the inner peripheral side of the second projection, and When the space communicating with the one valve box sheet from the third opening is narrowed and the valve body is switched to the third one-closed switching position, one of the disk members moves toward the inner peripheral side of the second projection. The third disc member fits into the inner peripheral side of the third protrusion while narrowing the space communicating with one valve box seat from the second and third openings. The space which communicates with the other valve box seat from the opening 3 is narrowed.
[0014]
According to this, when the valve element is switched to the first fully open switching position, the first projection projects between the tip of the first opening of the valve element and the inner surface of the valve box. The gap formed between the tip of the first opening and the inner surface of the valve box is reduced over the entire circumference by the first protrusion. Thereby, a part of the space that communicates with the two valve box sheets from the first opening through the outside of the valve body and is constricted by the first protrusions, so that foreign matter passes from the first opening to the space. Penetration can be substantially prevented, so that the valve box sheet can be prevented from being damaged by foreign matter.
[0015]
Further, when the valve body is switched to the second one-closed switching position, one of the disc members fits into the inner peripheral side of the third projection, so that it passes through the outside of the valve body from the second and third openings. A part of the space communicating with the other valve box sheet is narrowed by the one disk member and the third protrusion. Thereby, foreign matter can be substantially prevented from entering the space from the second and third openings, and therefore, the other valve box sheet can be prevented from being damaged by the foreign matter. Furthermore, since the other disk member fits into the inner peripheral side of the second projection, a part of the space that communicates with the one valve box sheet from the second and third openings through the outside of the valve body. It is constricted by the other disk member and the second protrusion. This can substantially prevent foreign matter from entering the space from the second and third openings, and thus can prevent one of the valve box sheets from being damaged by the foreign matter.
[0016]
Further, when the valve body is switched to the third one-closed switching position, one of the disc members fits into the inner peripheral side of the second projection, so that it passes through the outside of the valve body from the second and third openings. A part of the space communicating with the one valve box sheet is narrowed by the one disk member and the second protrusion. This can substantially prevent foreign matter from entering the space from the second and third openings, and thus can prevent one of the valve box sheets from being damaged by the foreign matter. Furthermore, since the other disk member fits into the inner peripheral side of the third protrusion, a part of the space that communicates with the other valve box sheet from the second and third openings through the outside of the valve body. It is constricted by the other disk member and the third protrusion. Thereby, foreign matter can be substantially prevented from entering the space from the second and third openings, and therefore, the other valve box sheet can be prevented from being damaged by the foreign matter.
[0017]
BEST MODE FOR CARRYING OUT THE INVENTION
Hereinafter, embodiments of the present invention will be described with reference to FIGS. Note that the same members as those of the above-described conventional members are denoted by the same reference numerals, and description thereof will be omitted.
[0018]
As shown in FIGS. 7 to 10, the valve body 6 is provided with a pair of disk members 30 a and 30 b parallel to each other. Assuming that the distance from the flow axis 8a of the first opening 8 to the second and third openings 9 and 10 is R, both disc members 30a and 30b have a radius centered on the flow axis 8a. An R circle is formed. As shown in FIG. 7, one of the disk members 30a is disposed on the first opening 8 side with respect to the rotation axis 16 of the valve body 6, and the other disk member 30b is connected to the rotation axis 16 above. The second opening 9 and the third opening 10 are located on the opposite side of the first opening 8 between the disk members 30a and 30b. The distance between the two disk members 30a, 30b is equal to the diameter of the second and third openings 9, 10.
[0019]
As shown in FIGS. 1 to 6, ring-shaped first to third projections 31 to 33 are provided on the inner surface of the valve box 2 by welding (or integrally forming). As shown in FIGS. 2 and 5, the first protrusion 31 is disposed coaxially with the flow axis 3 a (center line) of the first entrance 3 as the center, and 3 and when the valve element 6 is switched to the first fully open switching position A as shown in FIGS. 1 and 4, the distal end 8 b of the first opening 8 of the valve element 6 and the valve box 2 It protrudes all around the inner surface.
[0020]
The second and third projections 32 and 33 are arranged coaxially about the flow path axes 4a and 5a of the second and third entrances and exits 5, and have both valve boxes. It is located between the seats 12a and 12b.
[0021]
As shown in FIG. 2, when the valve body 6 is switched to the second one-closed switching position B, one disk member 30a fits into the inner peripheral side of the third protrusion 33 as shown in FIG. As shown in FIG. 6, the other disk member 30b is configured to fit into the inner peripheral side of the second protrusion 32.
[0022]
Also, as shown in FIG. 3, when the valve element 6 is switched to the third one-closed switching position C, similarly, one disk member 30a fits into the inner peripheral side of the second protrusion 32 and the other. The disk member 30b is configured to fit into the inner peripheral side of the third protrusion 33.
[0023]
Hereinafter, the operation of the above configuration will be described.
(1) When the operator turns the operating handle to switch the valve body 6 to the first fully-open switching position A as shown in FIG. 1, the first projection 31 is turned on as shown in FIG. Since it protrudes between the tip 8b of the first opening 8 of the body 6 and the inner surface of the valve box 2, it is formed between the tip 8b of the first opening 8 and the inner surface of the valve box 2. The gap is reduced over the entire circumference by the first protrusion 31 as compared with the conventional case. As a result, a part of the space S1 communicating from the first opening 8 to the two valve box sheets 12a and 12b through the outside of the valve body 6 is narrowed by the first projection 31, so that the foreign matter can be removed from the first projection 31. 1 can be almost prevented from entering the space S1 through the opening 8, and therefore, the sealing surfaces 13 of the valve box sheets 12a and 12b can be prevented from being damaged by foreign matter. In this case, a minute gap of about 2 mm to 4 mm is formed between the tip 8 b of the first opening 8 and the first projection 31.
[0024]
(2) As shown in FIG. 2, when the valve element 6 is switched to the second one-closed switching position B, as shown in FIG. To fit into one side, a part of the space S2 communicating from the second and third openings 9, 10 through the outside of the valve body 6 to the other valve box sheet 12b is partially connected to one of the disk members 30a and the third. Narrowed by the projection 33. Thereby, foreign matter can be almost prevented from entering the space S2 from the second and third openings 9, 10, and therefore, the sealing surface 13 of the other valve box sheet 12b is prevented from being damaged by the foreign matter. Can be.
[0025]
Further, as shown in FIG. 6, since the other disk member 30b fits into the inner peripheral side of the second projection 32, it passes through the outside of the valve body 6 from the second and third openings 9, 10. A part of the space S3 communicating with one valve box sheet 12a is narrowed by the other disk member 30b and the second protrusion 32. Thereby, foreign matter can be substantially prevented from entering the space S3 from the second and third openings 9, 10, and therefore, the sealing surface 13 of the one valve box sheet 12a is prevented from being damaged by the foreign matter. Can be. In this case, between the outer peripheral edge of the one disk member 30a and the inner peripheral edge of the third projection 33, and between the outer peripheral edge of the other disk member 30b and the inner peripheral edge of the second projection 32. Are formed with small gaps of about 2 mm to 4 mm, respectively.
[0026]
(3) Also, as shown in FIG. 3, when the valve element 6 is switched to the third one-closed switching position C, one of the disk members 30a fits into the inner peripheral side of the second protrusion 32, A part of the space S3 communicating from the second and third openings 9, 10 to the one valve box sheet 12a through the outside of the valve body 6 is narrowed by the one disk member 30a and the second protrusion 32. You. Thereby, foreign matter can be substantially prevented from entering the space S3 from the second and third openings 9, 10, and therefore, the sealing surface 13 of the one valve box sheet 12a is prevented from being damaged by the foreign matter. Can be.
[0027]
Further, since the other disk member 30b fits into the inner peripheral side of the third protrusion 33, the other disk member 30b passes through the outside of the valve body 6 from the second and third openings 9, 10 to the other valve box sheet 12b. A part of the communicating space S2 is narrowed by the other disk member 30b and the third protrusion 33. Thereby, foreign matter can be almost prevented from entering the space S2 from the second and third openings 9, 10, and therefore, the sealing surface 13 of the other valve box sheet 12b is prevented from being damaged by the foreign matter. Can be. In this case, between the outer peripheral edge of one disk member 30a and the inner peripheral edge of the second projection 32, and between the outer peripheral edge of the other disk member 30b and the inner peripheral edge of the third projection 33. Are formed with small gaps of about 2 mm to 4 mm, respectively.
[0028]
As shown in the above (1) to (3), it is possible to prevent the sealing surface 13 of each of the valve box sheets 12a and 12b from being damaged by a foreign substance, so that the sealing performance is improved.
In the above-described embodiment, the first to third protrusions 31 to 33 are welded to the inner surface of the valve box 2. However, the present invention is not limited to welding, and the first to third protrusions 31 to 33 are overlaid on the inner surface of the valve box 2. The first to third protrusions 31 to 33 may be formed.
[0029]
【The invention's effect】
As described above, according to the present invention, when the valve body is switched to each switching position, a pair of disk members provided on the valve body and the first to third projections provided on the inner surface of the valve box, Each space that communicates with both valve box sheets from the first to third openings of the valve body through the outside of the valve body is narrowed. Thereby, foreign matter can be substantially prevented from entering the spaces from the first to third openings, and therefore, it is possible to prevent both valve box sheets from being damaged by the foreign matter, and to improve sealing performance. improves.
[Brief description of the drawings]
FIG. 1 is a cross-sectional view of a three-way valve according to an embodiment of the present invention, showing a state where a valve body is switched to a first fully open switching position.
FIG. 2 is a cross-sectional view of the same three-way valve, showing a state where a valve body is switched to a second one-closed switching position.
FIG. 3 is a cross-sectional view of the same three-way valve, showing a state where a valve body is switched to a third one-side closed switching position.
FIGS. 4A and 4B are partially enlarged views of FIG. 1, wherein FIG. 4A is an enlarged view of a portion X in FIG. 1 and FIG. 4B is an enlarged view of a portion Y in FIG.
5A and 5B are partially enlarged views of FIG. 2, wherein FIG. 5A is an enlarged view of a portion W in FIG. 2 and FIG. 5B is an enlarged view of a portion X in FIG.
FIGS. 6A and 6B are partially enlarged views of FIG. 2, wherein FIG. 6A is an enlarged view of a portion Y in FIG. 2, and FIG. 6B is an enlarged view of a portion Z in FIG.
FIG. 7 is a partial sectional view of the valve body of the three-way valve, viewed from the axial direction of the valve stem.
8 is a view as viewed in the direction of arrows XX in FIG. 7;
FIG. 9 is a view taken in the direction of arrows YY in FIG. 7;
FIG. 10 is a view taken in the direction of arrows ZZ in FIG. 7;
FIG. 11 is a cross-sectional view of a conventional three-way valve, showing a state where a valve body is switched to a first fully open switching position.
FIG. 12 is a cross-sectional view of the same three-way valve, showing a state in which a valve body is switched to a second one-side closed switching position.
FIG. 13 is a cross-sectional view of the same three-way valve, showing a state where the valve element is switched to a third one-side closed switching position.
FIGS. 14A and 14B are partially enlarged views of FIG. 11, wherein FIG. 14A is an enlarged view of a portion X in FIG. 11 and FIG. 14B is an enlarged view of a portion Y in FIG.
15 is a partially enlarged view of FIG. 12, wherein (a) is an enlarged view of a portion W in FIG. 12, and (b) is an enlarged view of a portion X in FIG. 12;
FIGS. 16A and 16B are partially enlarged views of FIG. 12, wherein FIG. 16A is an enlarged view of a portion Y in FIG. 12, and FIG. 16B is an enlarged view of a portion Z in FIG.
[Explanation of symbols]
DESCRIPTION OF SYMBOLS 1 Three-way valve 2 Valve box 3-5 1st-3rd entrance / exit 3a Flow axis 4a of 1st entrance / exit Flow axis 5a of 2nd entrance / exit Flow axis 6 of 3rd entrance / exit 6 Valve body 8 10 to 10 First to third openings 8a Flow axis 12a, 12b of first opening Valve box seat 14 Valve body sheets 30a, 30b Disk members 31 to 33 First to third projections A First Fully-opened switching position B Second one-closed switching position C Third one-closed switching position S1 Space S2 communicating from the first opening to both valve box seats Communicating from the second and third openings to the other valve box seat. Space S3 Space communicating with one valve box seat from the second and third openings.

Claims (1)

A valve box having first to third entrances, and a first fully open switching position in which all of the first to third entrances are opened and a second single-closed switching position in which only the second entrance is closed in the valve enclosure. And a third one-way switching position in which only the third port is closed. A three-way valve having a rotatable valve body, wherein the first port is open to the first port in the first fully open switching position. An opening, a second opening that opens to the second doorway, and a third opening that opens to the third doorway are formed in the valve body, and a second doorway side in the valve box. Is provided with one of the ring-shaped valve box sheets centered on the flow axis of the second entrance, and a ring-shaped centered on the flow axis of the third entrance on the third entrance side. The other valve box sheet is provided, and the valve body has a pair of disc members, and the one valve member is switched to the second one-side switching position. A valve body sheet that is pressed against the box sheet and pressed against the other valve box sheet when switched to the third one-side switching position; And one disk member is disposed on the first opening side and the other disk member is disposed on the opposite side of the first opening, and the second disk member is disposed between the two disk members. An opening and a third opening are located, ring-shaped first to third protrusions are formed on the inner surface of the valve box, and the first protrusion is provided at a flow axis of a first entrance / exit. And when the valve element is switched to the first fully open switching position, the valve element projects between the tip of the first opening of the valve element and the inner surface of the valve box, and the two valve box seats pass through the first opening. And the second and third projections are centered on the flow axis of the second and third entrances and exits, and When the valve body is positioned between the two valve box sheets and the valve body is switched to the second one-closed switching position, one of the disk members is fitted into the inner peripheral side of the third projection, and the second and third disc members are fitted. The space communicating with the other valve box seat from the opening is narrowed, and the other disk member is fitted into the inner peripheral side of the second projection, and one valve box seat is inserted from the second and third openings. When the space communicating with the valve is narrowed and the valve body is switched to the third one-closed switching position, one of the disk members is fitted into the inner peripheral side of the second protrusion, and the second and third openings are provided. And the other disc member fits into the inner peripheral side of the third projection, and communicates with the other valve box seat from the second and third openings. A three-way valve characterized by constricting the space in which it runs.

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