JP7033794B2 - non-return valve - Google Patents

Description

The present invention relates to a check valve arranged in the middle of a fluid pipe.

The check valve is a valve seat, a valve body that can move axially between a state of being seated on the valve seat and a state of being separated from the valve seat, and a stopper that regulates the movement of the valve body to the separated side. The holder having a portion and the valve body are configured to open by moving the valve body to the separated side by fluid pressure, and close by moving the valve body to the valve seat side by the urging force of the spring. (See, for example, Patent Document 1).

In the check valve having the above configuration, when the valve body moves to the separation side, the end portion on the separation side of the valve body comes into contact with the stopper portion to restrict the movement of the valve body, so that the valve body becomes the stopper portion. The space for the stroke until contact must be secured in the holder with a size that matches the flow rate at the time of valve opening. Therefore, the length of the check valve in the axial direction becomes long, and there is an inconvenience that miniaturization cannot be achieved, and early improvement is desired.

Japanese Unexamined Patent Publication No. 2015-206407

In view of the above-mentioned situation, the present invention is to provide a check valve capable of shortening the axial length and reducing the size.

The check valve of the present invention has a valve seat, a valve body that can move axially between a closed position seated on the valve seat and an open position separated from the valve seat, and the like, in order to solve the above-mentioned problems. A check valve including a holder having a stopper portion that regulates the opening position of the valve body, wherein the valve body has the stopper portion at the end of the valve body at the closing position of the valve body. It is characterized by having a superposed portion that is located on the open position side of the valve body and that overlaps the stopper portion at the open position of the valve body when viewed from a direction orthogonal to the axial direction.

According to the present invention, in the valve body, the stopper portion side end of the valve body is located on the open position side of the stopper portion at the closed position of the valve body, and the valve body is overlapped with the stopper portion of the holder at the open position. By overlapping, the length of the holder in the axial direction can be shortened while ensuring the stroke of the valve body required to reach the open position.

Further, the check valve of the present invention includes a seating portion in which the valve body abuts on the valve seat and is seated, and a skirt portion extending from the seating portion toward the open position side to form the superposed portion. The skirt portion includes a plurality of skirt pieces extending toward the open position side at predetermined intervals in the circumferential direction around the axis, and the holder includes a plurality of valve guide portions for guiding the plurality of skirt pieces. The stopper portion having a connecting portion for connecting the open position side ends of the plurality of valve guide portions in the circumferential direction is provided, and the plurality of skirt pieces are the outer surface of the connecting portion at the opening position of the valve body. It may be positioned so as to face the connecting portion and overlap the connecting portion.

As described above, at the open position of the valve body, the plurality of skirt pieces provided on the valve body are opposed to the outer surface of the connecting portion of the stopper portion, so that the stopper portion and the valve body overlap each other.

Further, in the check valve of the present invention, the outer surface of the skirt piece in the circumferential direction may be formed as a tapered surface located inward in the radial direction toward the open position side.

As described above, if the outer surface of the skirt piece is formed on a tapered surface located radially inward toward the open position side, the valve body opens and the fluid flows in contact with the outer surface of the skirt piece. The pressure loss can be suppressed and the fluid can flow smoothly.

Further, the check valve of the present invention may have a recess formed inward in the radial direction on the outer surface of the skirt piece in the circumferential direction.

As described above, if the concave portion is formed on the outer surface of the skirt piece, the cross-sectional area of water flow through which the fluid flows when the valve body is opened can be increased.

According to the present invention, the valve body is provided with a superposed portion that overlaps with the stopper portion at the open position of the valve body, thereby providing a check valve capable of shortening the axial length and reducing the size. Can be done.

It is a vertical section side view which omitted a part of the water supply device which incorporated the check valve of this invention, and shows the state which the valve body of a check valve is located in an open position. It is a vertical sectional side view which partially omitted the water supply device, and shows the state which the valve body of a check valve is located in a closed position. It is a side view which shows the state which the valve body of the check valve of this invention is closed. It is a perspective view which shows the state which the valve body of the check valve is closed, and was seen from the rear. It is a vertical sectional view which shows the state which the valve body of the check valve is closed. It is a side view which shows the state which opened the valve body of the check valve. It is a perspective view which shows the state which opened the valve body of the check valve, and was seen from the rear. It is a vertical sectional view which shows the state which opened the valve body of the check valve. It is a side view of the valve body which constitutes the check valve. The valve body constituting the check valve is shown, and is a perspective view seen from the rear. It is a rear view which shows the valve body which constitutes the check valve.

1 and 2 show a longitudinal side view in which a part of the water supply device provided with the check valve 1 of the present invention is omitted. FIG. 1 shows a state in which the valve body 2 is located in the open position, and FIG. 2 shows a state in which the valve body 2 is located in the closed position.

In FIGS. 1 and 2, the check valve 1 is arranged in the secondary side pipe 3 (joint) connected to the secondary side end portion of the water meter M. FIG. 1 shows a state in which a fluid from the water meter M (tap water in this embodiment) can be supplied to the secondary side pipe 3, and FIG. 2 shows a state in which the water meter M (primary) from the secondary side pipe 3 can be supplied. ) The fluid does not flow back to the side. In FIG. 1, the base end side (left side in FIG. 1) of the check valve 1 is the upstream side (primary side), and the tip side (right side in FIG. 1) of the check valve 1 is the downstream side (secondary side). do.

The check valve 1 is shown in FIGS. 3 to 8 (FIGS. 3 to 5 show a state in which the valve body 2 is closed, and FIGS. 6 to 8 show a state in which the valve body 2 is open). The valve seat 4 (see FIG. 5), the valve body 2 that can move axially between the closed position seated on the valve seat 4 and the open position separated from the valve seat 4, and the open position of the valve body 2 are restricted. It is provided with a holder 6 having a stopper portion 5 and the like. Here, the valve body 2 is made of synthetic resin and the holder 6 is made of metal, but any material may be used as long as it does not pose a problem in terms of strength.

As shown in FIG. 5, the valve seat 4 has a cylindrical portion 4A having an outwardly expanding shape toward the upstream side where a water passage port 4a through which a fluid passes is formed in the central portion, and a radial direction from the upstream end of the cylindrical portion 4A. It is provided with a disk-shaped flange portion 4B extending outward. An annular packing 7 is fitted on the outer peripheral edge of the flange portion 4B of the valve seat 4. Further, an annular recess 4b for press-fitting the upstream end portion of the holder 6 to integrate the two is formed on the downstream surface of the flange portion 4B of the valve seat 4. By bending the inner peripheral edge 4C of the downstream end of the flange 4B of the valve seat 4 inward in the radial direction with a jig (not shown), the flange 6B of the holder 6 is prevented from coming off to the downstream side. (See FIGS. 5 and 8). Then, when the valve body 2 is seated on the valve seat 4 and is located at the closed position, the water passage port 4a is closed. As described above, by integrating the holder 6 and the valve seat 4 by press fitting, the effect that the axial dimension of the check valve 1 can be shortened as compared with the case where both are integrated by screwing. There is.

The valve body 2 has a seating portion 2A having a substantially C-shaped cross section (see FIG. 5) that abuts on the valve seat 4 and seats, and a skirt portion 2B extending from the outer peripheral edge of the seating portion 2A to the open position (downstream) side. A shaft portion 2C having a circular and rod-shaped cross section extending integrally downstream from the radial center portion of the seating portion 2A is provided. A space 2K for accommodating one end of the coil spring 9, which will be described later, is formed inside the seating portion 2A. Since the rod-shaped shaft portion 2C is provided, the valve body 2 can be smoothly moved in the axial direction, and the axial length of the skirt portion 2B can be shortened.

An annular packing 8 made of rubber or the like is sandwiched between the downstream end of the valve seat 4 and the upstream end of the holder 6. When the valve body 2 is in the closed position, the outer surface of the seating portion 2A comes into contact with the packing 8 so that the fluid does not move (leak) to the upstream side or the downstream side through the water passage port 4a.

As shown in FIGS. 9 to 11, the skirt portion 2B is composed of a plurality of (here, three) skirt pieces 2b, 2b, 2b. The plurality of skirt pieces 2b, 2b, 2b are formed so as to extend from the seating portion 2A to the open position (secondary) side at predetermined intervals in the circumferential direction. Each skirt piece 2b is formed in an arc shape when viewed from the downstream side, and is formed in a wide shape in which the length in the circumferential direction is longer than the length in the axial direction. Further, each skirt piece 2b projects radially outward from the outer peripheral edge 2G (indicated by the alternate long and short dash line) of the seating portion 2A (see FIGS. 9 and 11).

Further, as shown in FIGS. 9 to 11, the outer surface 2g of each skirt piece 2b in the circumferential direction is formed on a tapered surface located radially inward toward the open position (secondary) side, and the taper thereof is formed. A recess 2D located radially inside the other surface is recessed in the center of the surface. The concave surface (bottom surface) of the concave portion 2D has a tapered shape located inward in the radial direction toward the open position side. By forming the outer surface 2g on the tapered surface in this way, it is possible to suppress the pressure loss when the valve body 2 opens and the fluid comes into contact with the outer surface 2g of the skirt piece 2b and flows smoothly. can. Further, by forming the recess 2D on the outer surface 2g of the skirt piece 2b, it is possible to increase the cross-sectional area of water flow through which the fluid flows when the valve body 2 is opened. In this embodiment, the concave portion 2D is formed in an arcuate concave portion that is convex inward, but may be formed in an arcuate concave portion that is convex outward. In the case of this outwardly convex arcuate recess, the highest apex of the central portion may be located at the same position as the other surface.

The holder 6 has a plurality of (three) valve guide portions 6A, 6A, 6A for guiding the plurality of skirt pieces 2b, 2b, 2b while holding the valve body 2, and a plurality of valve guide portions 6A, 6A, 6A. The stopper portion 5 having a substantially triangular connecting portion 5A (see FIG. 7) when viewed from the downstream side connecting the open side (secondary side) ends of the valve guide portions 6A, 6A, 6A. It is provided with an annular flange portion 6B (see FIG. 5) that connects the upstream ends and extends radially outward.

As shown in FIG. 8, the stopper portion 5 includes a stopper main body 5B provided with a contact surface 5b that regulates the open position of the valve body 2 by abutting the downstream end 2t of the seating portion 2A of the valve body 2. The central portion of the stopper main body 5B is provided with a shaft portion guiding cylindrical portion 5C extending upstream to guide the movement of the shaft portion 2C of the valve body 2. A concave portion 5D recessed on the downstream side (secondary side) of the contact surface 5b is formed on the radial outer side of the shaft portion guiding cylindrical portion 5C, and the other end portion of the coil spring 9 is housed in this concave portion 5D. .. The coil spring 9 constitutes an urging means for urging the valve body 2 to the closed position by using an elastic force.

As shown in FIG. 7, the valve guide portion 6A is formed of a rod-shaped body having a rectangular cross-sectional shape and a long downstream side, and two guide surfaces 6a facing each other in the circumferential direction are adjacent to each other in the circumferential direction. , 6a, the skirt pieces 2b are guided while the both ends 2b1 and 2b1 in the circumferential direction of one skirt piece 2b are in contact with each other. The same applies to the other two skirt pieces 2b, and the description thereof will be omitted. By providing these three skirt pieces 2b, 2b, 2b, it is possible to prevent the valve body 2 from unexpectedly rotating when the valve body 2 moves in the axial direction. As described above, since the rod-shaped shaft portion 2C is provided, the valve body 2 can be smoothly moved in the axial direction, and the three skirt pieces 2b, 2b, and 2b constituting the skirt portion 2B can be smoothly moved in the axial direction. The length can be shortened.

Then, when the valve body 2 is positioned in the open position, the three skirt pieces 2b, 2b, 2b are the outer surfaces 5a, 5a, 5a at three locations in the circumferential direction of the connecting portion 5A of the stopper portion 5 (see FIG. 4). It is positioned so as to face the connecting portion 5A and overlaps with the connecting portion 5A when viewed from a direction orthogonal to the axial direction (see FIGS. 6 and 7). These three skirt pieces 2b, 2b, 2b form a superposed portion that overlaps with the stopper portion 5. In other words, the internal space 2H (see FIGS. 5, 10 and 11) is formed inside the three skirt pieces 2b, 2b, 2b, and when the valve body 2 is located in the open position, the internal space 2H is formed. By inserting (fitting) the connecting portion 5A, the three skirt pieces 2b, 2b, 2b and the stopper portion 5 overlap each other from the direction orthogonal to the axial direction (see FIGS. 6 to 8). In FIG. 6, by making the secondary side end portion of the connecting portion 5A of the stopper portion 5 and the secondary side end portion of the skirt pieces 2b, 2b, 2b curved, the valve body 2 is positioned at the open position and the fluid is released. When flowing, turbulence is less likely to occur in the fluid, which has the effect of reducing pressure loss. It is preferable that the radius of curvature of the curved surface of the secondary side end portion of the connecting portion 5A of the stopper portion 5 and the radius of curvature of the curved surface of the secondary side end portion of the skirt pieces 2b, 2b, 2b are substantially the same. ..

Therefore, the valve body 2 at the closed position moves to the open position on the downstream side due to the pressure of the fluid from the upstream side that opposes the urging force of the coil spring 9. When the valve body 2 is in the open position, as shown in FIGS. 6 to 8, the fluid (tap water) from the water meter M passes through the gap between the valve guide portions 6A and 6A adjacent to each other in the circumferential direction from the water passage port 4a. It is guided to the secondary side pipe 3. Further, when the supply of the fluid from the upstream side is stopped, the valve body 2 moves to the closed position on the upstream side by the urging force of the coil spring 9. At the closed position of the valve body 2, the stopper portion side end 2T of the valve body 2 is located on the closed position (primary) side of the stopper portion 5 (see FIG. 5).

When the valve body 2 is located in the open position, as described above, the three skirt pieces 2b, 2b, 2b are radially along the outer surfaces 5a, 5a, 5a at three locations in the circumferential direction of the connecting portion 5A of the stopper portion 5. It faces the connecting portion 5A from the outside and overlaps with the connecting portion 5A. As a result, the length of the holder 6 in the axial direction can be shortened while ensuring the stroke of the valve body 2 required to reach the open position. When the three skirt pieces 2b, 2b, 2b are positioned to face the outer surfaces 5a, 5a, 5a at three locations in the circumferential direction of the connecting portion 5A of the stopper portion 5 and overlap with the connecting portion 5A, both of them hit each other. It is preferable that the skirt pieces 2b, 2b, and 2b are not in contact with each other, that is, the inner surfaces of the skirt pieces 2b, 2b, and 2b are not in contact with each other, that is, the outer surfaces 5a, 5a, and 5a of the connecting portion 5A are not in contact with each other. It may be in a state. Further, in a state where the three skirt pieces 2b, 2b, 2b are positioned to face the outer surfaces 5a, 5a, 5a at three locations in the circumferential direction of the connecting portion 5A of the stopper portion 5 and overlap with the connecting portion 5A, the skirt pieces are overlapped with each other. The secondary side ends (stopper portion side end 2T) of 2b, 2b, and 2b are in a state of not protruding from the secondary side end 5T of the connecting portion 5A to the secondary side.

The present invention is not limited to the above embodiment, and various modifications can be made without departing from the gist of the present invention.

In the above embodiment, the skirt portion 2B of the valve body 2 is composed of three skirt pieces 2b, 2b, 2b, but may be composed of two or four or more skirt pieces. Further, the skirt portion 2B of the valve body 2 may be made of a cylindrical one. In this case, the outer surface of the skirt portion is guided to the inner surface of the holder to move the valve body.

Further, in the above embodiment, the skirt portion 2B of the valve body 2 overlaps from the outside of the stopper portion 5 at the open position of the valve body, but on the contrary, the skirt portion 2B of the valve body 2 is a stopper. It may be configured to overlap from the inside of the portion 5.

Further, in the above embodiment, the outer surface 2g of the skirt piece 2b is formed as a tapered surface located radially inward toward the open position side, but it may be a surface parallel to the axial direction.

Further, in the above embodiment, the recess 2D is formed on the outer surface 2g of the skirt piece 2b, but the outer surface of the skirt piece may be formed as a flat surface having no recess.

1 ... Check valve, 2 ... Valve body, 2A ... Seating part, 2B ... Skirt part, 2C ... Shaft part, 2D ... Recessed part, 2H ... Internal space, 2K ... Space, 2T ... Stopper part side end, 2b ... Skirt piece (Polymer part), 2b1 ... Both ends in the circumferential direction, 2g ... Outer surface, 2t ... Downstream side end, 3 ... Secondary side piping, 4 ... Valve seat, 4A ... Cylindrical part, 4B ... Flange part, 4C ... Inner peripheral edge, 4a ... Water flow port, 4b ... Recess, 5 ... Stopper part, 5A ... Connecting part, 5B ... Stopper body, 5C ... Shaft guide cylinder part, 5D ... Recessed part, 5T ... Secondary side end, 5a ... Outer surface, 5b ... Contact surface, 6 ... holder, 6A ... valve guide part, 6B ... flange part, 6a ... guide surface, 7,8 ... packing, 9 ... coil spring, M ... water meter

Claims (2)

A valve seat, a valve body that can move axially between a closed position seated on the valve seat and an open position separated from the valve seat, and a holder having a stopper portion that regulates the open position of the valve body. It is a check valve equipped
In the valve body, the stopper portion side end of the valve body is located closer to the closed position side than the stopper portion at the closed position of the valve body, and the stopper portion and the axial direction are located at the open position of the valve body. Equipped with overlapping parts that overlap when viewed from the direction orthogonal to the
The valve body includes a seating portion that abuts on the valve seat and is seated, and a skirt portion that extends from the seating portion toward the open position side and constitutes the superposed portion.
The skirt portion includes a plurality of skirt pieces extending toward the open position side at predetermined intervals in the circumferential direction around the axis.
The holder includes a plurality of valve guide portions for guiding the plurality of skirt pieces, and the stopper portion having a connecting portion for connecting the open position side end portions of the plurality of valve guide portions in the circumferential direction.
The plurality of skirt pieces are configured to face the outer surface of the connecting portion at the open position of the valve body and overlap the connecting portion.
A check valve characterized in that a concave portion recessed inward in the radial direction is formed on the outer surface of the skirt piece in the circumferential direction . The first aspect of claim 1 , wherein the outer surface of the skirt piece in the circumferential direction is formed on a tapered surface located radially inward toward the open position side, and the recess is formed in the center of the tapered surface. Check valve.

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