JP2021156425A - non-return valve - Google Patents

Abstract

A check valve capable of suppressing pressure loss while being compact is provided. [Solution] The check valve 1 comprises a primary joint 11, a secondary joint 12, a valve body 13 with a valve port 131 provided therein, and a valve element 14 formed in a flat plate shape, closing the valve port 131 when fluid flows out of the secondary joint 12 and opening the valve port 131 when fluid flows out of the primary joint 11, the valve element 14 is provided with a pair of axial projections 151 protruding from the periphery of the valve element 14 so as to form a rotation axis 14a of the valve element 14, the inner wall surface 132 of the valve body 13 is provided with a pair of grooves 16 into which the pair of axial projections 151 are rotatably fitted, and the pair of axial projections 151 are provided extending so as to be movable between a first position where the valve element 14 closes the valve port 131 and a second position P14 where the valve element 14 rotates to an open position P12 to open the valve port 131. [Selected Figure] Figure 1

Description

The present invention relates to a check valve.

Conventionally, a check valve provided in a refrigeration cycle system of an air conditioner or the like has a function of blocking a valve opening with a valve body against a backflow of fluid from a secondary side to prevent a backflow. On the other hand, for the flow of fluid from the primary side, it is required to open the valve port in a state where the pressure loss is suppressed as small as possible.

Therefore, a check valve has been proposed in which the valve body is formed in a flat plate shape and the valve body is in a posture along the flow of fluid from the primary side to open the valve opening (see, for example, Patent Document 1). .. The check valve is provided with a hinge structure that rotatably supports the valve body between a closed posture when backflow from the secondary side and an open posture when forward flow from the primary side. Then, the open posture of the valve body at the time of forward flow becomes the posture along the flow of the fluid from the primary side as described above, so that the pressure loss at the time of this forward flow is suppressed.

JP-A-2009-068548

Here, depending on the system configuration such as the refrigeration cycle system, it may be necessary to install the piping by a route in which a plurality of check valves are gathered in one installation area. In such a case, it is desirable that not only the pressure loss in the check valve is suppressed but also the check valve be small. In the above-mentioned check valve having a hinge structure, the pressure loss is suppressed, but on the other hand, there is a problem that the hinge structure causes an increase in the size of the check valve.

Therefore, it is an object of the present invention to pay attention to the above-mentioned problems and to provide a check valve capable of achieving both suppression of pressure loss and miniaturization.

In order to solve the above problems, the check valve of the present invention connects a tubular primary joint, a tubular secondary joint, the primary joint and the secondary joint to relay the flow of fluid. , A tubular valve body having a valve port communicating with the primary joint inside, and a closed posture that is formed in a flat plate shape and intersects the axis of the valve body when fluid flows out from the secondary joint. The valve body closes the valve opening, and when the fluid flows out from the primary joint, the valve body rotates to an open posture tilted with respect to the closed posture so as to follow the flow of the fluid to open the valve opening. The valve body is provided with a pair of axial protrusions protruding from the peripheral edge of the valve body so as to form a rotation axis of the valve body, and the inner wall surface of the valve body is provided with the above. The pair of grooves into which the pair of shaft-shaped protrusions are rotatably fitted closes the valve opening in the closing posture of the valve body in the direction along the axis of the valve body. It is possible to move between the first position and the second position where the valve body is farther from the valve opening than the first position and the valve body rotates from the closed posture to the open posture to open the valve opening. It is characterized in that it is extended so as to be.

According to the check valve of the present invention, at the time of forward flow from the primary side, the flat plate-shaped valve body rotates in an open posture along the flow of the fluid from the primary side to open the valve opening. The pressure loss at the time is suppressed. A mechanism for rotatably supporting the valve body between the closed position and the open position is a pair of axial protrusions protruding from the peripheral edge of the valve body and a pair of grooves provided on the inner wall surface of the valve body. , And are configured. Since this mechanism fits inside the cylindrical valve body together with the valve body that is large enough to close the valve opening, there is a concern that the check valve will be enlarged as in the hinge structure described above. No. That is, the check valve of the present invention can be miniaturized including the above-mentioned mechanism for supporting the valve body by downsizing the valve body to a size necessary and sufficient for opening and closing the valve opening. As described above, according to the check valve of the present invention, it is possible to achieve both suppression of pressure loss and miniaturization.

Here, the pair of shafts extend along the rotation axis on the surface of the valve body facing the side of the secondary joint in the closed posture, and both ends thereof project from the peripheral edge of the valve body. It is preferable that the shaft rod having a shaped protrusion is fixed.

According to this configuration, first, the rotation shaft of the valve body is formed by a shaft rod that is separate from the valve body and is fixed to the valve body and has the above-mentioned pair of axial protrusions. Compared to forming a valve body and a pair of shaft-shaped protrusions by precision integral molding, it is easier to form and fix the valve body and shaft rod individually, so the cost can be reduced. Can be done. That is, according to the above configuration, the cost of the check valve can be reduced.

Further, it is preferable that the pair of axial protrusions are provided as the rotation shaft so as to form a rotation shaft that is biased from the center of the valve body to a part of the peripheral edge.

According to this configuration, the valve body is divided into a wide area portion having a large area and a narrow area portion having a narrow area across a biased rotation axis. The force received by the valve body being pushed by the fluid from the valve opening is greater in the wide area than in the narrow area, so when the valve body rotates from the closed position to the open position, the wide area is secondary. It rotates toward the side and the narrow region portion toward the primary side, that is, the valve port side. The radius of gyration from the axis of rotation in the narrow region portion is shorter than, for example, the radius of gyration when the axis of rotation is provided so as to pass through the center of the valve body. As a result, the rotation axis required to separate the narrow region portion of the valve body from the valve opening until it can be rotated to the open posture, that is, the movement distance of the pair of axial protrusions is also such that the rotation axis passes through the center of the valve body. It will be shorter than when it is provided in. As a result, the length of the pair of grooves that support the pair of axial protrusions while moving them can be shortened. If the length of this groove is too long, the axial protrusion will come off the groove during the movement or rotation of the valve body, or a part of the valve body will become the valve opening during the rotation from the open posture to the closed posture. The possibility of getting in is increased. According to the above configuration, since the length of the groove can be shortened, it is possible to suppress the occurrence of the shaft-shaped protrusion from the groove and the valve body entering the valve opening.

Further, in the valve body, the surface facing the secondary joint side in the closed posture protrudes from the surface and interferes with the inner wall surface of the valve body when the valve body rotates from the closed posture. Therefore, it is also preferable that the movement of the valve body is stopped at a stage before the valve body is in a posture parallel to the axis, and a stopper protrusion is provided so that the posture at that stage is in the open posture.

According to this configuration, the opening posture of the valve body can be made to be a slightly tilted posture in front of the posture parallel to the axis by the stopper protrusion. As a result, the valve body is likely to receive a force from the fluid when a backflow from the secondary side occurs in the open position, and the valve body can be quickly rotated to the closed position.

Further, it is more preferable that the stopper protrusions are provided at a pair of positions that pass through the center of the valve body and are line-symmetric with respect to a line orthogonal to the rotation axis.

According to this configuration, a pair of line-symmetrical stoppers receive a force from the inner wall surface of the stopper protrusion that interferes with the inner wall surface of the valve body when the valve body that is continuously pushed by the fluid from the valve port during forward flow is kept in the open posture. It can be dispersed in each of the protrusions in a well-balanced manner. Thereby, the durability of the stopper protrusion in the valve body can be improved.

Further, when the outflow of the fluid from the primary joint stops, the valve body rotates by gravity from the open posture to the closed posture, and when the fluid starts to flow out from the secondary joint, the valve body is pushed by the fluid. It is preferable that the valve port is pressed against the valve port to close the valve port.

According to this configuration, since the valve body is rotated to the closed posture by using gravity, a special mechanism or the like related to rotation is not required, and the cost can be reduced.

Further, the valve body is arranged horizontally so that the axis line is along the horizontal direction, and the valve body is oriented downward as the open posture approaches the secondary joint with respect to the horizontal direction. It may be configured to be tilted downward.

According to this configuration, since the open posture is the downward tilted posture in the horizontal arrangement, the valve body is naturally rotated to the closed posture by gravity when the outflow of the fluid from the primary joint is stopped. It is suitable because it can be used.

Further, the valve body is vertically arranged so that the axis line is along the vertical direction, and the valve body is configured such that the open posture is inclined with respect to the vertical direction. May be good.

According to this configuration, since the open posture is the tilted posture in the vertical arrangement, when the outflow of fluid from the primary joint stops, the valve body is blocked by gravity in the direction of increasing the tilt. It is suitable because it can be rotated naturally toward the posture.

Further, the primary joint and the secondary joint are cylindrical joints having substantially the same inner diameter as each other, and the valve body has a cylindrical shape having an inner diameter larger than the inner diameters of the primary joint and the secondary joint. It is preferable that the primary joint is attached to the primary joint so that one end opening of the primary joint serves as the valve opening.

According to this configuration, the structure of the check valve is simplified by making the valve body cylindrical while using the opening at one end of the primary joint as it is as the valve port. This makes it possible to further reduce the size of the check valve, for example, by suppressing the outer diameter of the valve body to a degree slightly larger than the outer diameter of the primary joint.

Further, it is more preferable that the valve body is formed in a disk shape having a diameter larger than that of the valve port.

According to this configuration, since the valve body is a little larger than the circular valve port, the inner diameter of the cylindrical valve body is larger than that of the valve body having a polygonal shape. It is possible to further reduce the size of the check valve, such as keeping it to the minimum necessary.

According to the check valve of the present invention, it is possible to achieve both suppression of pressure loss and miniaturization.

It is sectional drawing which shows the check valve which concerns on one Embodiment of this invention in the open state at the time of a forward flow. It is sectional drawing of the check valve shown in FIG. It is sectional drawing which shows the check valve shown in FIG. 1 in the closed state at the time of the backflow. It is sectional drawing of the check valve shown in FIG. It is a figure which shows the appearance that the pair of shaft-shaped protrusions are rotatably fitted on the inner wall surface of a valve body with a pair of grooves, which is an enlarged cross section of the peripheral portion of the grooves. It is a figure which shows the state which the shaft rod shown in FIGS. It is a schematic diagram which shows how the check valve shown in FIGS. 1 to 6 is used in a horizontal arrangement. It is a schematic diagram which shows how the check valve shown in FIGS. 1 to 6 is used in a vertical arrangement. It is a perspective view which shows the shaft rod and the stopper protrusion of the modification with respect to the embodiment shown in FIGS. 1 to 8 together with a valve body. 9 is a plan view showing a shaft rod, a stopper protrusion, and a valve body shown in FIG. It is a schematic diagram which shows an example of the refrigeration cycle system to which the check valve of the embodiment and the modification shown in FIG. 1 to FIG. 10 is applied.

A check valve according to an embodiment of the present invention will be described.

FIG. 1 is a cross-sectional perspective view showing a check valve according to an embodiment of the present invention in an open state at the time of forward flow, and FIG. 2 is a cross-sectional view of the check valve shown in FIG. Further, FIG. 3 is a cross-sectional perspective view showing the check valve shown in FIG. 1 in a closed state at the time of backflow, and FIG. 4 is a cross-sectional view of the check valve shown in FIG.

The check valve 1 of the present embodiment is a valve device that allows the flow of fluid in the forward flow direction D11 from the primary side to the secondary side and prohibits the flow of fluid in the backflow direction D12 from the secondary side to the primary side. Yes, it includes a primary joint 11, a secondary joint 12, a valve body 13, and a valve body 14.

The primary joint 11 is a cylindrical joint provided with a primary side flange 111 connected to the valve body 13 on one end side. The secondary joint 12 is a cylindrical joint having a secondary side flange 121 connected to the valve body 13 on one end side and having substantially the same diameter as the primary joint 11.

The valve body 13 is a portion that connects the primary joint 11 and the secondary joint 12 and relays the flow of fluid. The valve body 13 is formed in a cylindrical shape having an inner diameter φB larger than the inner diameter φA of the primary joint 11 and the secondary joint 12, one end is connected to the primary side flange 111 of the primary joint 11, and the other end is the secondary joint. It is connected to the secondary side flange 121 of 12. In the valve body 13, the opening of the primary side flange 111, which is an opening at one end of the primary joint 11 and slightly protrudes inward from the inner circumference of the valve body 13, is the primary joint. It is a valve port 131 that communicates with 11. The check valve 1 is configured such that the primary joint 11, the secondary joint 12, the valve body 13, and the valve port 131 are coaxial with each other.

The valve body 14 is formed in a flat plate shape, specifically, in a disk shape having a diameter larger than the inner diameter of the valve port 131 (that is, the inner diameter φA of the primary joint 11) and a smaller diameter than the inner diameter φB of the valve body 13. It is a part. FIG. 3 and FIG. 4 show that the valve body 14 intersects the axis of the valve body 13 (that is, the axis 1a of the check valve 1) when the fluid flows out from the secondary joint 12 in the backflow direction D12. The valve opening 131 is closed in the closing posture P11 shown in 1. Further, the valve body 14 is tilted with respect to the closing posture P11 so as to follow the flow of the fluid when the fluid flows out from the primary joint 11 in the forward flow direction D11, and is open as shown in FIGS. 1 and 2. The valve port 131 is opened by rotating to the posture P12.

Here, of the front and back surfaces of the valve body 14, the secondary surface 141 facing the side of the secondary joint 12 in the closed posture P11 extends along the rotation shaft 14a, and both ends thereof are the valve body 14. An elongated columnar shaft rod 15 that protrudes from the peripheral edge and becomes a pair of shaft-shaped protrusions 151 is fixed.

Then, on the inner wall surface 132 of the valve body 13, a pair of grooves 16 into which the pair of shaft-shaped protrusions 151 of the shaft rod 15 are rotatably fitted are provided so as to extend in the direction along the axis 1a as follows. Has been done.

FIG. 5 is a view showing a state in which a pair of axial protrusions are rotatably fitted on the inner wall surface of the valve body with a pair of grooves, which is an enlarged cross section of the peripheral portion of the grooves.

As shown in FIG. 5, the valve body 14 has a closed posture that closes the valve opening 131, which is one end opening of the primary joint 11, when the fluid flow changes from the backflow direction D12 to the forward flow direction D11. It rotates in the direction of arrow D13 from P11 to the open posture P12. At this time, if the rotating shaft 14a, that is, the pair of axial protrusions 151 on the shaft rod 15 is in an immovable state in the direction along the axis 1a, the peripheral edge of the valve body 14 interferes with the peripheral edge of the valve opening 131. The valve body 14 cannot rotate. Therefore, in the present embodiment, the valve body 14 can be rotated by moving the shaft-shaped protrusion 151 in the forward flow direction D11 so as to be separated from the valve port 131. Further, when the fluid flow changes from the forward flow direction D11 to the reverse flow direction D12, the valve body 14 can rotate in the opposite direction.

In order to enable the movement of the shaft-shaped protrusion 151, the groove 16 into which the shaft-shaped protrusion 151 is fitted is such that the shaft-shaped protrusion 151 can be moved between the first position P13 and the second position P14 at d11. It extends along the axis 1a and is provided on the inner wall surface 132 of the valve body 13. The first position P13 is a position on the valve port 131 side in which the valve body 14 closes the valve port 131 in the closing posture P11. The second position P14 is farther from the valve opening 131 than the first position P13, and the valve body 14 rotates from the closed posture P11 to the open posture P12 to open the valve opening 131. The grooves 16 are provided on the inner wall surface 132 of the cylindrical valve body 13 so that a pair of grooves 16 face each other so as to correspond one-to-one with the pair of shaft-shaped protrusions 151. Further, each groove 16 is formed from an end edge of the valve body 13 on the valve port 131 side. Therefore, at the time of assembly, the valve body 14 with the shaft rod 15 is fitted into the pair of grooves 16 from the end edge on the valve port 131 side so that the pair of shaft-shaped protrusions 151 is fitted into the valve body 13 in the forward flow direction D11. It can be assembled.

Further, in the present embodiment, the shaft rod 15 having the pair of shaft-shaped protrusions 151 forms a rotating shaft 14a that is biased from the center of the valve body 14 to a part of the peripheral edge (upper side in FIGS. 1 to 5). As shown above, it is fixed at a position biased to the relevant side.

FIG. 6 is a view showing how the shaft rods shown in FIGS. 1 to 5 are fixed at a biased position in a plan view with respect to the surface of the valve body to which the shaft rods are fixed.

As shown in FIG. 6, the shaft rod 15 is a part of the valve body 14 from the center 145 to the peripheral edge on the secondary surface 141 facing the secondary joint 12 in the closed posture P11. It is provided so as to form a rotation shaft 14a that is biased toward the side of 142. With this configuration, the valve body 14 is divided into a wide area portion 143 having a large area and a narrow area portion 144 having a narrow area across the biased rotation shaft 14a. The force received by the valve body 14 being pushed by the fluid from the valve port 131 is greater in the wide area portion 143 than in the narrow area portion 144. Therefore, when the valve body 14 rotates from the closed posture P11 to the open posture P12, the wide area portion 143 rotates toward the secondary side and the narrow region portion 144 rotates toward the primary side, that is, toward the valve opening 131. It will be.

Further, in the present embodiment, the following stopper protrusions 17 are provided on the secondary surface 141 of the valve body 14 facing the secondary joint 12 when the closed posture P11. The stopper protrusion 17 is a portion that protrudes from the secondary surface 141 and interferes with the inner wall surface 132 of the valve body 13 when the valve body 14 rotates from the closed posture P11. Due to this interference, the stopper protrusion 17 stops the movement of the valve body 14 at a stage before the valve body 14 is in a posture parallel to the axis 1a, and the posture at that stage is set to the open posture P12. As shown in FIG. 6, the stopper protrusions 17 are provided at a pair of positions that pass through the center 145 of the valve body 14 and are line-symmetric with respect to the line 14b orthogonal to the rotation axis 14a. ..

Here, the check valve 1 of the present embodiment can be used in either a horizontal arrangement or a vertical arrangement as described below.

FIG. 7 is a schematic view showing how the check valves shown in FIGS. 1 to 6 are used in a horizontal arrangement, and FIG. 8 is a check valve shown in FIGS. 1 to 6. Is a schematic diagram showing how is used in a vertical arrangement.

In the horizontal arrangement shown in FIG. 7, the valve body 13, that is, the check valve 1, is arranged so that the axis 1a is along the horizontal direction D14. At this time, in the present embodiment, the narrow region portion 144 of the valve body 14 is on the upper side in the closed posture P11 (the upper side here means that the narrow region portion 144 is located above the wide area portion 143. At this time, the narrow region portion 144 is not directly above the wide area portion 143, that is, the valve body 14 is not parallel to the vertical direction, and the valve body 14 may be slightly tilted with respect to the vertical direction.) The check valve 1 is arranged so as to be. In such a horizontal arrangement, the valve body 14 is in a downward tilted posture in which the open posture P12 is tilted with respect to the horizontal direction D14 so that the valve body 14 is inclined downward as it approaches the secondary joint 12.

Then, when the fluid flow changes from the forward flow direction D11 to the reverse flow direction D12, the valve body 14 moves as follows to close the valve port 131. When the flow of the fluid changes, the outflow of the fluid from the primary joint 11 first stops, and at this time, the valve body 14 rotates in the direction of arrow D15 from the open posture P12 toward the closed posture P11 by gravity. Since the open posture P12 of the valve body 14 is tilted downward by the stopper projection 17, and the lower side of this tilt is the heavy wide area portion 143, the rotation of the valve body 14 in the arrow D15 direction is promoted. Is to be done. Then, when the valve body 14 rotates in the direction of the arrow D15 in this way, the valve body 14 takes a posture substantially perpendicular to the axis line 1a with the axial protrusion 151 remaining at the second position P14. Next, when the fluid starts to flow out from the secondary joint 12 in the backflow direction D12, the valve body 14 is pushed along the groove 16 and pressed against the valve port 131 in the direction of the arrow D16, and the valve port 131 is pushed. To block. Further, when the fluid flow changes from the backflow direction D12 to the forward flow direction D11, the valve body 14 is pushed by the fluid from the valve port 131, and the valve body 14 moves in the direction opposite to the movement described above, so that the valve port 131 is moved. It will be released.

In the vertical arrangement shown in FIG. 8, the valve body 13, that is, the check valve 1, is arranged so that its axis 1a is along the vertical direction D17. In this vertical arrangement, the valve body 14 is in an inclined posture in which the open posture P12 is tilted with respect to the vertical direction D17.

In this vertical arrangement, when the fluid flow changes from the forward flow direction D11 to the reverse flow direction D12, the valve body 14 moves as follows to close the valve opening 131. First, when the outflow of the fluid from the primary joint 11 is stopped, the valve body 14 rotates by gravity from the open posture P12 to the closed posture P11 and falls along the groove 16 as shown by the arrow D18. .. Further, when the fluid starts to flow out from the secondary joint 12 in the backflow direction D12, the valve body 14 is pushed by the fluid and pressed against the valve port 131 along the groove 16 to close the valve port 131. Further, when the fluid flow changes from the backflow direction D12 to the forward flow direction D11, the valve body 14 is pushed by the fluid from the valve port 131, and the valve body 14 moves in the direction opposite to the movement described above, so that the valve port 131 is moved. It will be released.

In the vertical arrangement shown in FIG. 8, the valve body posture has the primary joint 11 on the lower side and the secondary joint 12 on the upper side, but the posture is not limited to this, and the upper side is not limited to this. The valve body may have a primary joint 11 and a secondary joint 12 on the lower side. In this posture, it can be used when the flow velocity at the time of backflow is high and the fluid has momentum. In the posture of this configuration, when there is no flow and when the valve is in the forward flow, the valve is in the open posture P12 when the valve body is fully opened, and when the fluid flows back vigorously from the secondary side joint, the valve is closed by dynamic pressure. It is a thing.

According to the check valve 1 of the embodiment described above, at the time of forward flow from the primary side, the flat plate-shaped valve body 14 rotates to the open posture P12 so as to follow the flow of the fluid from the primary side, and the valve opening. Since 131 is opened, the pressure loss at the time of this forward flow is suppressed. Then, a mechanism for rotatably supporting the valve body 14 between the closed posture P11 and the open posture P12 is provided on the pair of axial protrusions 151 protruding from the peripheral edge of the valve body 14 and the inner wall surface 132 of the valve body 13. It is configured to have a pair of grooves 16 provided. Since this mechanism fits entirely in the cylindrical valve body 13 together with the valve body 14 which is large enough to close the valve port 131, the check valve 1 is enlarged as in the hinge structure described above. There is no concern about turning it into a cylinder. That is, in the present embodiment, the valve body 14 can be miniaturized to a size necessary and sufficient for opening and closing the valve port 131, so that the valve body 14 can be miniaturized including the above-mentioned mechanism for supporting the valve body 14. As described above, according to the present embodiment, it is possible to achieve both suppression of pressure loss and miniaturization.

Here, in the present embodiment, a shaft rod 15 having both ends protruding from the peripheral edge of the valve body 14 to form a pair of axial protrusions 151 is fixed to the secondary surface 141 of the valve body 14. According to this configuration, first, the rotating shaft 14a of the valve body 14 is formed by a shaft rod 15 that is separate from the valve body 14. Compared to forming the valve body 14 and the pair of shaft-shaped protrusions 151 by precise integral molding, it is better to individually form and fix the valve body 14 and the shaft rod 15 to remove the valve body by pressing (existing). Since the plate material is the material, accuracy such as surface roughness and flatness is obtained) and the existing centerless round bar material with outer diameter dimensional accuracy is only required to be connected and fixed, so it is easy as a work. Therefore, the cost can be reduced. That is, according to the above configuration, the cost of the check valve 1 can be reduced.

Further, in the present embodiment, the pair of axial protrusions 151 are provided so as to form a rotation shaft 14a that is biased from the center 145 of the valve body 14 toward the side of a part 142 at the peripheral edge. According to this configuration, the valve body 14 is divided into a wide area portion 143 having a large area and a narrow area portion 144 having a narrow area across the biased rotation shaft 14a. The force received by the valve body 14 being pushed by the fluid from the valve port 131 is greater in the wide area portion 143 than in the narrow area portion 144. Therefore, when the valve body 14 rotates from the closed posture P11 to the open posture P12, the wide area portion 143 rotates toward the secondary side and the narrow region portion 144 rotates toward the primary side, that is, the valve opening 131 side. The turning radius from the rotating shaft 14a in the narrow region portion 144 is shorter than, for example, the turning radius when the rotating shaft 14a is provided so as to pass through the center 145 of the valve body 14. As a result, the rotation shaft 14a required to separate the narrow region portion 144 of the valve body 14 from the valve opening 131 until it can rotate to the open posture P12, that is, the movement distance of the pair of shaft-shaped protrusions 151 is also the movement distance of the rotation shaft 14a. It is shorter than the case where it is provided so as to pass through the center 145 of the valve body 14. As a result, the length of the pair of grooves 16 that support the pair of axial protrusions 151 while moving them can be shortened. If the length of the groove 16 is too long, the axial protrusion 151 may come off from the groove 16 during the movement or rotation of the valve body 14, or the valve body 14 may be rotated from the open posture P12 to the closed posture P11. There is an increased possibility that a part of the valve will enter the valve port 131. According to the above configuration, since the length of the groove 16 can be shortened, it is possible to suppress the occurrence of the shaft-shaped protrusion 151 coming off from the groove 16 and the valve body 14 entering the valve opening 131.

Further, in the present embodiment, the stopper protrusion 17 is provided on the secondary surface 141 of the valve body 14. The stopper protrusion 17 interferes with the inner wall surface 132 of the valve body 13 when the valve body 14 rotates from the closed posture P11, so that the movement of the valve body 14 is stopped at a stage before the posture becomes parallel to the axis 1a. The posture at that stage is the open posture P12. According to this configuration, the open posture P12 of the valve body 14 can be set to a slightly tilted posture in front of the valve body 14 so as to be parallel to the axis 1a by the stopper protrusion. As a result, the valve body 14 is likely to receive a force from the fluid when a backflow from the secondary side occurs in the open posture P12, and the valve body 14 can be quickly rotated to the closed posture P11.

Further, since the stopper protrusion 17 is provided on the secondary surface 141 of the valve body 14, it is possible to obtain an effect of suppressing the occurrence of the following situations during rotation during opening / closing movement of the valve body 14. That is, during rotation of the valve body 14 during opening / closing movement, the amount of movement of one of the pair of shaft-shaped protrusions 151 in the groove 16 of the shaft-shaped protrusion 151 is within the groove 16 of the other shaft-shaped protrusion 151. If the amount of movement of the valve body 14 becomes larger than the normal amount and the rotation shaft 14a is tilted more than usual, the shaft-shaped protrusion 151 may come off from the groove 16 during rotation during opening / closing movement of the valve body 14, or the valve body 14 may move to the valve port 131. Situations such as intrusion are likely to occur. In the present embodiment, by providing the stopper protrusion 17, the inclination of the rotating shaft 14a as described above can be suppressed, so that the possibility of the above-mentioned situation occurring can be suppressed.

Further, in the present embodiment, the stopper protrusions 17 are provided at a pair of positions that pass through the center 145 of the valve body 14 and are line-symmetric with respect to the line 14b orthogonal to the rotation axis 14a. According to this configuration, the force received from the inner wall surface 132 of the stopper protrusion 17 that interferes with the inner wall surface 132 of the valve body 13 during forward flow can be distributed to each of the pair of line-symmetrical stopper protrusions 17 in a well-balanced manner. Thereby, the durability of the stopper protrusion 17 in the valve body 14 can be improved. Further, since the pair of stopper protrusions 17 is provided, it is possible to further suppress the possibility of the above-mentioned shaft-shaped protrusions 151 coming off from the groove 16 and the valve body 14 entering the valve opening 131. ..

Further, in the present embodiment, the valve body 14 rotates by gravity from the open posture P12 to the closed posture P11 when the outflow of the fluid from the primary joint 11 stops. After that, when the fluid starts to flow out from the secondary joint 12, it is pushed by the fluid and pressed against the valve port 131 to close the valve port 131. According to this configuration, since the valve body 14 is rotated to the closed posture P11 by using gravity, a special mechanism or the like related to the rotation is not required, and the cost can be reduced.

Further, in the present embodiment, in the horizontal arrangement shown in FIG. 7, the valve body 14 is tilted with respect to the horizontal direction D14 so that the open posture P12 becomes downward as it approaches the secondary joint 12. It will be in a downward tilted posture. According to this configuration, when the outflow of the fluid from the primary joint 11 is stopped, the valve body 14 can be naturally rotated to the closed posture P11 by gravity, which is preferable.

Further, in the present embodiment, in the vertical arrangement in which the primary joint 11 shown in FIG. 8 is placed on the lower side, the valve body 14 is in an inclined posture in which the open posture P12 is tilted with respect to the vertical direction D17. According to this configuration, when the outflow of the fluid from the primary joint 11 is stopped, the valve body 14 can be naturally rotated toward the closed posture P11 in the direction in which the inclination becomes large due to gravity, which is preferable. ..

Further, in the present embodiment, the primary joint 11 and the secondary joint 12 are cylindrical joints having inner diameters substantially the same diameter as each other. Further, the valve body 13 is a cylindrical portion having an inner diameter larger than the inner diameters of the primary joint 11 and the secondary joint 12, and the primary joint 11 is provided with an opening at one end of the primary joint 11 so as to be a valve opening 131. It is attached. According to this configuration, the structure of the check valve 1 is simplified by making the valve body 13 cylindrical while using the opening at one end of the primary joint 11 as it is as the valve port 131. As a result, the check valve 1 can be further miniaturized, such as suppressing the outer diameter of the valve body 13 to a degree slightly larger than the outer diameter of the primary joint 11.

Further, in the present embodiment, the valve body 14 is formed in a disk shape having a diameter larger than that of the valve port 131. According to this configuration, since the valve body has a disc shape that is slightly larger than the circular valve port, the inner diameter of the cylindrical valve body 13 is set to be smaller than that of the valve body having a polygonal shape. It is possible to further reduce the size of the check valve 1 by keeping it to the minimum necessary for fitting.

Next, a modification to the embodiment described above will be described. In the following modification, the shaft rod and the stopper protrusion provided on the valve body 14 are different from the embodiments shown in FIGS. 1 to 8.

9 is a perspective view showing a shaft rod and a stopper protrusion of a modified example with respect to the embodiment shown in FIGS. 1 to 8 together with a valve body, and FIG. 10 is a perspective view showing the shaft rod and the stopper shown in FIG. It is a top view which shows a protrusion and a valve body.

In this modification, the elongated columnar shaft rod 15a is fixed to the secondary surface 141 so that the rotating shaft 14a-1 passes through the center 145 of the valve body 14. A pair of stopper protrusions 17a are provided in the vicinity of the shaft rod 15a provided in this way at positions that are line-symmetric with respect to the line 14b that passes through the center 145 and is orthogonal to the rotation shaft 14a-1. Further, these stopper protrusions 17a are carried out as described above so that when the valve body 14 rotates about the rotation shaft 14a-1 passing through the center 145, an open posture inclined to the same degree as that of the above-described embodiment can be obtained. It is longer than the stopper protrusion 17 in the form.

Further, also in this modification, the movement of the pair of axial protrusions 151 in the groove 16 during rotation during opening / closing movement of the valve body 14 by the long stopper protrusion 17a provided on the secondary surface 141 of the valve body 14. By suppressing the deviation of the distance and suppressing the inclination of the rotating shaft 14a-1, it is possible to suppress the possibility of the occurrence of a situation such as the shaft-shaped protrusion 151 coming off the groove 16 or the valve body 14 entering the valve opening 131. can. Further, even in this modification, the possibility of such a situation can be further suppressed by providing a pair of the stopper protrusions 17a.

The shaft rod and stopper protrusion provided on the valve body 14 are not limited to the shaft rod 15 and stopper protrusion 17 of the above-described embodiment, and may be provided at a position and length as in the present modification.

The positions and lengths of the shaft rods and stopper protrusions on the valve body are not limited to the above-described embodiments and examples in this modification. The positions of the shaft rod and the stopper protrusion may be different from those shown in the examples, and the length may be shorter than the example or longer than the example, and the design may be changed and applied as appropriate.

This is the end of the description of the embodiment and its modified example, and subsequently, an example of the refrigeration cycle system to which the embodiment and its modified example are commonly applied will be described.

FIG. 11 is a schematic view showing an example of a refrigeration cycle system to which the check valve of the embodiment and the modified example shown in FIGS. 1 to 10 is applied. Note that FIG. 11 shows an abstract check valve 5 in which the features of the above-described embodiment and modification are discarded.

The refrigeration cycle system 50 of FIG. 11 is used, for example, in an air conditioner such as a commercial air conditioner. In the refrigeration cycle system 50, an indoor heat exchanger 51, an outdoor heat exchanger 52, an expansion valve 53, a four-way valve 54, and three compressors 55 connected in parallel are shown in FIG. It is connected to the system by piping. The check valve 5 has a compressor 55 on the primary side and a four-way valve 54 between the discharge (high pressure output) side and the four-way valve 54 in each compressor 55 in order to prevent the refrigerant from flowing back to each compressor 55. Connected as a secondary side.

During the cooling operation, as shown by the solid line arrow D51, the refrigerant that has absorbed heat in the indoor heat exchanger 51 flows to the compressor 55 via the four-way valve 54, and is compressed by the compressor 55. The outdoor heat exchanger 52 is reached via the check valve 5 and the four-way valve 54. Then, after releasing heat by the outdoor heat exchanger 52, the heat is returned to the indoor heat exchanger 51 via the expansion valve 53. During the heating operation, as shown by the dotted arrow D52, the refrigerant that has released heat in the indoor heat exchanger 51 reaches the outdoor heat exchanger 52 via the expansion valve 53. Then, after absorbing heat by the outdoor heat exchanger 52, it flows to the compressor 55 through the four-way valve 54, is compressed by the compressor 55, and then passes through the check valve 5 and the four-way valve 54 to the indoor side. Return to the heat exchanger 51. The refrigeration cycle system 50 repeats these cycles to cool and heat the room.

Here, for example, under a condition where the cooling load is large, since the three compressors 55 are operated at the same time, each of the three check valves 5 is fully opened. Further, under the condition that the cooling load is small, it is sufficient to operate one compressor 55, so that the other two compressors 55 are not operated. At this time, the secondary side pressure of the two check valves 5 becomes higher than the primary side pressure, so that a backflow from the secondary side occurs, and the two check valves 5 are closed.

It should be noted that the embodiments and modifications described above merely show typical embodiments of the present invention, and the present invention is not limited thereto. That is, it can be modified in various ways without departing from the gist of the present invention. As long as the check valve of the present invention is still provided by such deformation, it is, of course, included in the category of the present invention.

For example, in the above-described embodiments and modifications, check valves 1 and 5 used in air conditioners such as commercial air conditioners have been exemplified, but check valves are used not only for commercial air conditioners but also for home air conditioners. It may be applied not only to an air conditioner but also to various refrigerators, refrigerators and the like.

Further, in the above various refrigeration cycle systems, the installation is not limited to the installation of the compressor on the discharge side as in the check valve installation example of the refrigeration cycle of FIG. 11, but at various locations during various refrigeration cycles. It can be applied to prevent backflow.

Further, as the refrigerant of each refrigeration cycle system, there are a wide variety of refrigerants (for example, various fluorocarbon-based refrigerants, hydrocarbon-based refrigerants, natural refrigerants such as CO2 and ammonia, etc.), and refrigeration corresponding to any of these refrigerants. The check valve of the present invention can also be applied to the cycle system.

Further, in the above-described embodiments and modifications, the specific shapes of the check valves 1 and 5 are illustrated as cylindrical or disk-shaped. However, the check valve of the present invention is not limited to the specific examples illustrated, and an appropriate shape or the like is selected and applied to each part according to the performance and operating conditions required for the check valve. can do.

Further, in the above-described embodiment and modification, a mode in which the rotation shafts 14a and 14a-1 of the valve body 14 are formed by one shaft rod 15 and 15a fixed to the secondary surface 141 of the valve body 14 is exemplified. Has been done. However, the portion forming the rotation axis of the valve body is not limited to one shaft rod, and for example, a pair of short shafts fixed to the secondary surface so that a part of each protrudes from the peripheral edge of the valve body. It may be a stick. Further, for example, it may be a pair of short shaft rods fixed to the outer peripheral surface of the valve body so that a part of each protrudes from the peripheral edge (outer circumference) of the valve body. Alternatively, the portion forming the rotation axis of the valve body may be a pair of axial protrusions or the like, each of which is formed by integral molding with the valve body and projects from the peripheral edge. As described above, in the form in which a pair of short shaft rods are fixed as shaft-shaped protrusions on the outer peripheral surface of the valve body, or the pair of shaft-shaped protrusions are integrally molded so as to protrude from the outer peripheral surface of the valve body, the valve is used. The axis of rotation of the body passes within the thickness range of the valve body. At this time, if the diameter of each shaft-shaped protrusion is equal to or less than the plate thickness of the valve body, the amount of protrusion of the shaft-shaped protrusion from the valve body to the secondary side in the thickness direction can be set to zero. Alternatively, when the diameter of each shaft-shaped protrusion is suppressed to a degree slightly larger than the plate thickness of the valve body, the amount of protrusion of the shaft-shaped protrusion from the valve body to the secondary side in the thickness direction is not zero. It can be suppressed to a considerable extent. When the amount of protrusion of the shaft-shaped protrusion is suppressed to zero or a considerable degree in this way, the length of the groove supporting the shaft-shaped protrusion can be shortened by that amount, and the shaft-shaped protrusion can be disengaged from the groove or the valve. It is possible to further suppress the occurrence of entry into the valve opening of the body. However, as described above, the cost of the check valve 1 can be reduced by forming the rotating shafts 14a and 14a-1 of the valve body 14 by the single shaft rods 15 and 15a.

Further, in the above-described embodiment, the pair of axial protrusions 151 are provided so as to form a rotation shaft 14a that is biased from the center 145 of the valve body 14 toward the side of a part 142 at the peripheral edge. However, the position of the axial protrusion may be a position that passes through the center of the valve body, as shown by an example in the above-described modification. However, by providing a pair of shaft-shaped protrusions 151 so as to form a rotating shaft 14a that is partially biased toward the side of 142, the shaft-shaped protrusions 151 may come off from the groove 16 into which the shaft-shaped protrusions 151 are fitted. The points that can be suppressed are also as described above.

Further, in the above-described embodiment and modification, the valve body 14 in which the stopper protrusions 17 and 17a are provided on the secondary surface 141 is exemplified. However, the valve body is not limited to this, and the stopper protrusion may not be provided. However, as described above, by providing the stopper protrusions 17 and 17a, the valve body 14 can be quickly rotated to the closed posture P11 when a backflow from the secondary side occurs. Further, even if the valve body is provided with the stopper protrusions, the number thereof is not limited to the pair as in the above-described embodiment and the modified example, and may be one or a plurality of stopper protrusions other than the pair. However, as described above, the durability of the stopper protrusions 17 and 17a in the valve body 14 can be improved by providing the pair of stopper protrusions 17 and 17a in line symmetry.

Further, in the above-described embodiment and modification, when the flow of the fluid changes from the forward flow to the reverse flow, it is rotated by gravity and pushed by the fluid from the secondary joint 12 and pressed against the valve opening 131. A valve body 14 that closes 131 is illustrated. However, the movement of the valve body when the fluid flow changes from forward flow to reverse flow is not limited to this, and any other movement can be adopted as long as the posture can be changed from the open posture to the closed posture. be. However, according to the valve body that moves as described above, the cost of the check valve 1 can be reduced as described above.

Further, in the above-described embodiment and modification, in the horizontal arrangement shown in FIG. 7, the valve body 14 in which the open posture P12 is in the downward tilted posture is exemplified. However, the open posture of the valve body is not limited to this, and any posture can be taken in the horizontal arrangement as long as it follows the flow of the fluid. However, as described above, it is preferable that the valve body 14 can be naturally rotated to the closed posture P11 by setting the open posture P12 in the horizontal arrangement to the downward tilted posture.

Further, in the above-described embodiment and modification, in the vertical arrangement shown in FIG. 8, the valve body 14 is exemplified by the valve body 14 in which the open posture P12 is tilted with respect to the vertical direction D17. Has been done. However, the open posture of the valve body is not limited to this, and any posture can be taken even in the vertical arrangement as long as it follows the flow of the fluid. However, as described above, it is preferable that the valve body 14 can be naturally rotated to the closed posture P11 by setting the open posture P12 in the vertical arrangement to the tilted posture.

Further, in the above-described embodiment and modification, the primary joint 11 and the secondary joint 12 have a cylindrical shape having substantially the same inner diameter as each other, and the valve body 13 has a cylindrical portion having an inner diameter larger than these inner diameters. A check valve 1 in which one end opening of the primary joint 11 is a valve opening 131 is exemplified. However, the check valve is not limited to this, and for example, in the dimensional relationship of each inner diameter as described above, only the primary joint has a straight shape without a flange portion, and a valve body having a valve opening is used. , The configuration such as the shape of each part can be appropriately set. However, as described above, the check valve 1 can be further miniaturized by adopting the above configuration.

Further, in the above-described embodiment and modification, the valve body 14 is formed in a disk shape having a diameter larger than that of the valve port 131. However, the valve body is not limited to this, and the configuration such as its shape can be appropriately set. However, as described above, the check valve 1 can be further miniaturized by adopting the above configuration.

Further, in the above-described embodiment and modification, as an example of the arrangement of the check valve, as described with reference to FIGS. 7 and 8, when the check valve is used in the horizontal arrangement or in the vertical arrangement. The case where it is used in an arrangement is illustrated. However, the arrangement of the check valve is not limited to these examples, and it is also possible to use the check valve in the inclined arrangement at the angle between the horizontal installation and the vertical installation described above. Has the same effect.

Further, in the above-described description of the embodiment and the modified example, the case where the plate thickness of the valve body 14 is constant is exemplified. The plate thickness on the wide area portion 143 side may be thicker than that on the portion 144 side. As a result, the position of the center of gravity of the valve body shifts toward the wider area portion 143, so that there is an effect that the valve body 14 can more easily return to the closed posture P11 when the flow from the primary side is stopped.

Further, in the above-described embodiment and modification, as an example of the valve body, the valve body 14 which is flat and has a circular shape in a plan view is exemplified. However, the plan view shape of the valve body is not limited to a circular shape, and may be a polygonal shape, an elliptical shape, or the like. However, since the inner diameters of the joint and the valve body are circular, it is possible to further reduce the size by making the plan view shape of the valve body 14 circular.

1,5 Check valve 1a Axis line 11 Primary joint 12 Secondary joint 13 Valve body 14 Valve body 14a, 14a-1 Rotating shaft 14b line 15,15a Shaft rod 16 Groove 17,17a Stopper protrusion 50 Refrigeration cycle system 51 Indoor heat Exchanger 52 Outdoor heat exchanger 53 Expansion valve 54 Four-way valve 55 Compressor 111 Primary side flange 121 Secondary side flange 131 Valve port 132 Inner wall surface 141 Secondary surface 142 Part 143 Wide area part 144 Narrow area part 145 Center 151 Shaft Protrusion D11 Forward flow direction D12 Backflow direction D14 Horizontal direction D17 Vertical direction P11 Blocking posture P12 Opening posture P13 1st position P14 2nd position d11 Between mutual φA, φB inner diameter

Claims (10)

Cylindrical primary joint and
Cylindrical secondary fitting and
A cylindrical valve body in which the primary joint and the secondary joint are connected to relay the flow of fluid and a valve port communicating with the primary joint is provided inside.
It is formed in a flat plate shape, and when the fluid flows out from the secondary joint, the valve opening is closed in a closed posture intersecting the axis of the valve body, and when the fluid flows out from the primary joint, the fluid It is provided with a valve body that rotates to an open posture tilted with respect to the closed posture so as to follow the flow and opens the valve opening.
The valve body is provided with a pair of axial protrusions protruding from the peripheral edge of the valve body so as to form a rotation axis of the valve body.
On the inner wall surface of the valve body, a pair of grooves into which the pair of shaft-shaped protrusions are rotatably fitted are formed, and the pair of shaft-shaped protrusions are formed on the inner wall surface of the valve body in a direction along the axis of the valve body. A first position for closing the valve port in the closed position and a position farther from the valve port than the first position, the valve body rotates from the closed position to the open position to open the valve port. A check valve characterized in that it is extended so as to be movable between two positions. In the valve body, the surface facing the secondary joint in the closed posture extends along the rotation axis, and both ends thereof project from the peripheral edge of the valve body to form the pair of axial protrusions. The check valve according to claim 1, wherein the shaft rod is fixed. Claim 1 or 2 is characterized in that the pair of axial protrusions are provided as the rotation axis so as to form a rotation axis that is biased from the center of the valve body to a part of the peripheral edge. Check valve described in. In the valve body, the surface facing the secondary joint in the closed posture protrudes from the surface and interferes with the inner wall surface of the valve body when the valve body rotates from the closed posture. The first aspect of the present invention is that the movement of the valve body is stopped at a stage before the valve body is in a posture parallel to the axis, and a stopper protrusion is provided so that the posture at that stage is in the open posture. The check valve according to any one of 3 to 3. The check valve according to claim 4, wherein the stopper protrusions are provided at a pair of positions that pass through the center of the valve body and are line-symmetrical with respect to a line orthogonal to the rotation axis. valve. When the outflow of the fluid from the primary joint stops, the valve body rotates by gravity from the open posture to the closed posture, and when the fluid starts to flow out from the secondary joint, the valve body is pushed by the fluid. The check valve according to any one of claims 1 to 5, wherein the check valve is pressed against the valve port to close the valve port. The valve body is arranged horizontally so that the axis is along the horizontal direction.
The check valve according to claim 6, wherein the valve body has a downwardly inclined posture in which the open posture is inclined downward with respect to the horizontal direction so as to be downward toward the secondary joint. The valve body is vertically arranged so that the axis line is along the vertical direction.
The check valve according to claim 6, wherein the valve body has an inclined posture in which the open posture is inclined with respect to the vertical direction. The primary joint and the secondary joint are cylindrical joints having substantially the same inner diameter as each other.
The valve body is a cylindrical portion having an inner diameter larger than the inner diameter of the primary joint and the secondary joint, and is attached to the primary joint so that one end opening of the primary joint becomes the valve opening. The check valve according to any one of claims 1 to 8, wherein the check valve is provided. The check valve according to claim 9, wherein the valve body is formed in a disk shape having a diameter larger than that of the valve port.

Images