JP2009041645A - Check valve - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a check valve having simple construction for reliably and efficiently discharging fluid. <P>SOLUTION: The check valve comprises a hollow cylindrical member 1 having a discharge port 1a in one end and a distribution port A for fluid to be distributive toward the discharge port 1a, and opened at the other end, a hollow cylindrical piston member 2 arranged slidably in a hollow portion of the hollow cylindrical member 1 in the axial direction, having a distribution port B in the side face for the fluid to be distributive, and having a top portion 2b forming a closed pressure receiving portion, a coil spring 3 arranged in the hollow portion of the hollow cylindrical member 1 on the downstream side of the piston member 2 for energizing the piston member 2 toward the upstream side, and a straightening vane 4 arranged on the downstream side of the coil spring 3. In this check valve, the piston member 2 is moved forward in the axial direction in response to pressure on the pressure receiving portion (the top portion 2b) to make the distribution port B communicative with the distribution port A. <P>COPYRIGHT: (C)2009,JPO&INPIT

Description

  The present invention relates to a check valve (check valve) useful for efficiently opening and closing a flow path (particularly a flow path having a large flow rate).

  The check valve is a member used to open and close the flow path using the fluid pressure of the fluid in the flow path of the piping. Such a check valve includes an urging means such as a spring, and a valve body that is urged to the closed position by the urging means and can move to the closed position against the urging force of the urging means. ing. FIG. 4 is a schematic sectional view showing an example of a conventionally known check valve. The check valve shown in FIG. 4 has a hollow cylinder having an opening 41a through which fluid can be circulated at one end and a discharge part 41b through which the fluid circulated from the opening 41a can be discharged at the other end. A cylindrical member 41 and a spring (or spring) 42 disposed in the axial direction or the longitudinal direction of the cylindrical member 41 in contact with the end of the discharge portion 41b in the hollow portion 41c of the hollow cylindrical member 41 The hollow portion 41c of the cylindrical member 41 is provided with a ball 43 that is disposed so as to contact the end of the spring 42 and close the opening portion 41a at the hollow portion. In this check valve, the pressure of the fluid flowing from the opening 41a acts on the ball 43, and the ball 43 pressed by the fluid pressure contracts the spring 42 in the axial direction and moves toward the discharge portion 41b. Thus, a gap is formed between the ball 43 and the hollow portion (that is, the opening 41a is released), and the fluid flows from the gap to the hollow portion and the fluid is discharged from the discharge portion 41b. .

  Further, in Japanese Utility Model Publication No. 5-66738 (Patent Document 1), in the above-described check valve using a ball, the winding direction is reversed to the outside (or the periphery) of the spring. A check valve fitted with a guide spring is disclosed. Further, in FIG. 1 of Japanese Utility Model Laid-Open No. 5-66378 (Patent Document 2), in the check valve or the like, instead of a ball for closing the opening end, a piston having a flat portion on which fluid pressure acts is provided. The check valve used is disclosed.

  However, in these conventional check valves, since fluid pressure is applied to the ball or piston and fluid is circulated through a slight gap generated between the ball or piston and the cylindrical member, the fluid can be efficiently circulated or Cannot be discharged. In particular, since such a gap is used, it is difficult to distribute a large flow rate of fluid.

  On the other hand, JP-A-8-52386 (Patent Document 3) discloses a fluid channel (2) communicating with a fluid ejection port (1) and a valve element (3) capable of opening and closing the fluid channel (2). And an elastic member (14) for moving and energizing the valve body (3) to the flow path closed position, and a fluid pressure exceeding a set pressure acts to cause the valve body (3) to move to the elastic member ( 14) A fluid jet nozzle device in which a pressure receiving surface (18) that is moved to a flow path opening position against the urging force of 14) is provided in the valve body (3), and the valve body (3) and the elastic member A fluid ejection nozzle device is disclosed in which a member (14) is mounted at a position between an inlet (15) of the fluid flow path (2) and a strainer (13) surrounding the inlet (15). ing. In the nozzle device described in this document, as is apparent from the drawing, when the fluid pressure acts on the pressure receiving surface located on the side surface of the valve body, the valve body is pushed down to contact the valve seat and close. The upper end portion of the valve body is released, and the fluid flows.

In such a check valve, the pressure receiving surface is separated from the portion (the upper end portion of the valve body) through which the fluid flows by release (that is, the pressure receiving surface and the release portion are separated), so that the fluid pressure acts. Compared to the check valve that uses the gap formed by the member itself, the fluid can be introduced or circulated efficiently into the fluid flow path. However, it still has a structure in which a fluid pressure is applied to the valve body itself to create a gap between the valve body and the part in contact with the valve body, so it is difficult to sufficiently increase the fluid discharge amount. is there. In other words, the check valve has a structure in which the upper end of the valve body is opened to secure a flow path, but as is apparent from FIG. In addition to being limited to the area, the flow path is narrowed by the thickness of the valve body and the spring, so that the flow path cannot be made sufficiently large. Further, the check valve described in this document has a complicated structure.
Japanese Utility Model Laid-Open No. 5-66738 (claim for registration of utility model, FIG. 1) Japanese Utility Model Laid-Open No. 5-66378 (Utility Model Registration Request, FIG. 1) JP-A-8-52386 (Claims)

  Accordingly, an object of the present invention is to provide a check valve suitable for application to a flow path having a large flow rate.

  Another object of the present invention is to provide a check valve capable of opening and closing a fluid flow path reliably and efficiently in accordance with fluid pressure (or fluid pressure) even with a simple structure.

  Still another object of the present invention is to provide a check valve capable of discharging a large amount of fluid without changing the size of the casing portion.

  As a result of intensive studies to achieve the above-mentioned problems, the present inventors have determined that a hollow cylindrical member (hollow cylindrical case) having a first flow port through which a fluid can flow in a check valve (or check valve). ), A piston member that is slidably disposed in the hollow portion of the hollow cylindrical member and has a second flow port formed on a side surface thereof that can communicate with the first flow port, and the piston member in the upstream direction. When combined with a biasing member (such as a spring) that biases the fluid, the fluid can be discharged reliably and efficiently in accordance with the fluid pressure despite the simple structure. However, the present invention has been completed by finding that it can be discharged or distributed.

  That is, the check valve of the present invention includes a hollow cylindrical member having a discharge port (or a discharge unit) capable of discharging a fluid at one end and an opening at the other end, and a side surface of the hollow cylindrical member. And a first flow port (or flow hole) through which fluid can flow toward the discharge port and the hollow portion of the hollow cylindrical member in the axial direction (specifically, the hollow cylindrical member) A hollow piston member that is slidable (or slidable in the axial direction or longitudinal direction) and has an open end on the discharge port side, and is formed on a side surface of the piston member, and the axial direction of the piston member A second flow port (or a flow hole) that can communicate with the first flow port with the forward movement of the first flow port and that can flow the fluid toward the opening end, and a hollow portion of the hollow cylindrical member. Out of the piston member (or open end and discharge) Between the mouth, for example, brought into contact with the edge of the opening) is arranged, and a biasing member for biasing the piston member in the upstream direction. In such a check valve, the flow port can be formed on the side surface, and the flow rate can be adjusted by the area of the flow port regardless of the cross-sectional area of the hollow cylindrical member. For this reason, in the check valve of the present invention, it is easy to enlarge the flow path freely. For these reasons, in particular, the first flow port (and the second flow port) may be formed larger in area than the cross-sectional area of the hollow cylindrical member (and the hollow piston member). In the check valve, a pressure receiving portion may be formed at the top of the piston member. By forming the pressure receiving portion at the top in this manner, the flow rate (or flow path) can be increased while making the check valve more compact.

  Such a check valve utilizes the fact that the first circulation port and the second circulation port communicate (or overlap) by sliding the piston member against the urging force of the urging member. Therefore, despite the simple structure, the fluid can be reliably and efficiently circulated (or introduced) into the hollow portion. By adjusting the degree of overlap between the circulation ports, the discharge amount of the fluid can be easily adjusted, and in particular, a large amount of fluid can be discharged by increasing the degree of communication (degree of overlap). .

  In the check valve, the axial direction of one of the first circulation port and the second circulation port (for example, the first circulation port) (or the longitudinal direction or the sliding direction of the hollow cylindrical member). May be formed to be longer than the length in the axial direction (or the longitudinal direction or the sliding direction of the hollow cylindrical member) of the other flow port (for example, the second flow port). When the first and second flow ports are formed in this way, one flow port (for example, the second flow port) is slightly displaced in the axial direction in accordance with a change in pressure acting on the piston member or the top. Moreover, since the state which the 1st circulation port and the 2nd circulation port overlapped can be maintained, the fluctuation | variation of the circulation amount of a fluid can be suppressed.

  Further, in the check valve, between the hollow cylindrical member and the piston member, the rotation of the piston member in the circumferential direction with respect to the hollow cylindrical member is restricted, and the piston member is arranged in the axial direction of the hollow cylindrical member. A positioning unit may be formed for sliding the device. Such a positioning unit is formed, for example, in the axially extending groove formed on one of the inner surface of the hollow cylindrical member and the outer surface of the piston member, and on the other surface. You may comprise with the convex part which can be slid along. By forming such a positioning unit, the first flow port and the second flow port can be communicated more reliably and efficiently in response to pressure (particularly fluid pressure) acting on the piston member. Can do.

  The check valve of the present invention may further include a rectifying plate (or rectifier) in the hollow portion of the hollow cylindrical member. Such a baffle plate should just be arrange | positioned downstream from the 2nd distribution port, for example, is provided in the hollow part (especially between a discharge port and a biasing member) downstream from a biasing member. May be. With such a rectifying plate, even if a fluid (particularly a large flow rate fluid) flows from the flow port on the side surface to the hollow cylindrical member, the flow can be rectified. Can discharge well.

  In this specification, the direction from the other end of the hollow cylindrical member toward one end (discharge port) is referred to as “flow direction”, and “upstream (side)” and “downstream” with respect to this flow direction. (Side) ”is defined. For example, the discharge port is located on the downstream side of the hollow cylindrical member, and the first flow port is located on the upstream side of the discharge port. The “axial direction (or longitudinal direction)” means the axial direction (or longitudinal direction) of the hollow cylindrical member.

  Since the check valve of the present invention combines a hollow cylindrical member having the first flow port, a piston member having the second flow port, and an urging member, the first flow port And the second circulation port can be communicated with each other, which is suitable for application to a flow path having a large flow rate. In addition, since the overlap between the circulation ports is used, the fluid flow path can be reliably opened and closed according to the fluid pressure despite the simple structure. Further, since the structure utilizes the sliding of the piston member, a large flow rate of fluid can be discharged without changing the size of the hollow cylindrical member serving as the casing portion.

  Hereinafter, the present invention will be described in detail with reference to the accompanying drawings as necessary.

  FIG. 1 is a schematic view showing an example of the check valve of the present invention, and FIG. 2 is a cross-sectional view of the check valve shown in FIG.

  The check valve shown in FIGS. 1 and 2 has a hollow cylindrical member 1 having a discharge port 1a capable of discharging a fluid at one end and the other end opened, and the hollow cylindrical member 1 A hollow cylindrical piston member 2 slidably disposed (or disposed) in the hollow portion in the axial direction (or the axial direction or longitudinal direction of the hollow cylindrical member 1), and the hollow portion of the hollow cylindrical member 1 The coil spring 3 is disposed on the downstream side of the piston member 2 to urge the piston member 2 in the upstream direction, and the rectifying plate 4 is disposed on the downstream side of the coil spring 3.

  In the check valve of this figure, on the side surface of the hollow cylindrical member 1, fluid can flow toward the discharge port 1 a and an elliptical flow port A (or a long axis is directed in the axial direction) (or A plurality of first flow ports A) are formed at predetermined intervals in the circumferential direction. The piston member 2 has a plurality of circular flow ports B (or second flow ports B) through which fluid can flow at a predetermined interval in the circumferential direction of the side surface, and is downstream of the flow port B. It has a circular opening end 2a through which fluid can flow on the side (or discharge port side), and the top (or piston head) 2b is closed to form a pressure receiving portion. Then, in response to at least the pressure acting on the top (or piston head) 2b serving as a pressure receiving portion, the piston member 2 moves forward (incoming motion, slides) in the axial direction, whereby the flow port B can communicate with the distribution port A.

  In the check valve shown in FIGS. 1 and 2, the discharge port 1a has a tapered shape (conical shape) whose cross-sectional diameter (inner diameter) continuously decreases toward the downstream side (or tip). . Further, the lower end portion of the rectifying plate 4 is supported by being supported by the end portion or the middle portion of the discharge port 1a, so that the rectifying plate 4 does not fall downstream from the discharge port 1a. Furthermore, since the piston member 2 (or the cylindrical portion 2c) is closed (or sealed) upstream of the flow port B, the fluid flowing from the flow port B is hollow in the piston member 2. Through the part, it does not circulate upstream toward the other end of the hollow cylindrical member 1.

  In the example shown in FIG. 1 and FIG. 2, in order to efficiently communicate such a circulation port A and a circulation port B in response to pressure reception, between the hollow cylindrical member 1 and the piston member 2, The piston member 2 can be moved back and forth in the axial direction, and the rotation of the piston member 2 in the circumferential direction with respect to the hollow cylindrical member 1 is restricted, and the piston member 2 is moved in the axial direction of the hollow cylindrical member 1. A positioning unit for sliding is formed.

  Specifically, the hollow cylindrical member 1 includes a main body cylindrical portion 1b and a hollow cylindrical cap member 1e attached to an upstream end (upstream side opening portion) of the cylindrical portion 1b. The cap member 1e is formed with a peripheral wall 1c capable of abutting the main body cylindrical portion 1b with the end face on the upstream side. The cap member 1e can be positioned and fixed to the main body cylindrical portion 1b by welding the end surface on the upstream side of the main body cylindrical portion 1b and the peripheral wall 1c. A plurality of grooves (or rails) 1d are formed on the inner surface of the cap member 1e so as to extend along both axial ends of the hollow cylindrical member 1 along the axial direction.

  The piston member 2 is provided with a convex portion 2e that can slide (or slide) along the groove 1d on the outer surface on the upstream side of the flow port B. That is, the piston member 2 extends from the cylindrical portion 2c to the upstream side in the axial direction and has a hollow cylindrical portion 2c having the flow port B on its side surface, and is fitted into the hollow portion of the cap member 1e. And a solid cylindrical piston portion 2d movable in the axial direction. The outer surface of the cylindrical piston member 2d has a plurality of convex portions 2e extending in the axial direction from the upstream end toward the downstream side. Is formed.

  When the piston member 2 is biased in the upstream direction by the coil spring 3, the groove 1d is fitted into the convex portion 2e, and the cylindrical member 2c is fitted into the cap member 1e, whereby the hollow portion is formed. The rotation of the cylindrical member 1 in the circumferential direction is restricted, and the cylindrical member 1 is positioned so as to move in a direction (axial direction) along the rail 1d. Further, the diameter (outer diameter) of the cylindrical portion 2c is larger than the inner diameter of the cap member 1e, and the upstream peripheral wall end surface of the cylindrical portion 2c can abut against the downstream end surface of the cap member 1e. Movement of the piston member 2 to the upstream side is also restricted, and the piston member 2 does not fall off from the other end of the hollow cylindrical member 1. Further, since the piston member 2 (or the cylindrical portion 2c) has an outer diameter that is slidable in the hollow portion of the hollow cylindrical member 1 (and the cylindrical piston portion 2d is the cap member 1c). Therefore, it is possible to suppress or prevent the fluid from flowing from the gap between the piston member 2 and the hollow cylindrical member 1 to the upstream side as much as possible.

  In the example of this figure, a spray nozzle 5 is attached to the end of the hollow cylindrical member 1 on the discharge port side. In addition, the check valve provided with the spray nozzle 5 can attach the hollow cylindrical member 1 to the partition wall of the header in a state where the flow port A of the hollow cylindrical member 1 faces the fluid (liquid).

  And when the said convex part 2e (or the said piston member 2) slides in the sliding direction of the said rail 1d, the said distribution port B and the said distribution port A overlap the said distribution port B (namely, distribution port). A and the distribution port B are in communication). For this reason, the flow port B can be reliably communicated with the flow port A as the piston member 2 slides.

  As described above, in the check valve shown in FIGS. 1 and 2, the hollow cylindrical member 1 is disposed between the hollow cylindrical member 1 (or the rail 1d) and the piston member 2 (or the convex portion 2e). On the other hand, a positioning unit for regulating the circumferential rotation of the piston member 2 and sliding the piston member 2 in the axial direction of the hollow cylindrical member is formed.

  FIG. 3 is a cross-sectional view showing a state in which the flow port A and the flow port B communicate with each other in the check valve shown in FIGS. 1 and 2. As apparent from FIG. 3, the flow port A and the flow port B are in a positional relationship overlapping each other as described above, and therefore the coil spring 3 is contracted downstream at least on the top portion 2b as a pressure receiving portion. When a sufficient pressure is applied, the piston member 2 slides in the hollow portion in the axial direction toward the downstream side along with the slide of the convex portion 2c along the rail 1d, whereby the flow port B Can be reliably communicated with the distribution port A.

  Then, when the flow port B and the flow port A are communicated with each other in a state where fluid pressure is applied to the flow port A (or at least on the side surface of the hollow cylindrical member 1 including the flow port A), the flow port A, fluid circulates in the hollow portion of the piston member 2 through the circulation port B, and the circulated fluid is further discharged from the circular opening end 2a of the piston member 2 through the coil spring 3 and the rectifying plate 4 from the discharge port 1a. Is done.

  In such a check valve, since the pressure is applied to the top portion 2b and the communication (or overlap) between the flow port A and the flow port B that accompanies the sliding of the piston member 2 is utilized, the structure is simple. Nevertheless, the fluid flow path can be opened and closed efficiently. Further, since sliding of the piston member 2 is used, a large flow rate of fluid can be discharged without changing the size of the hollow cylindrical member 1.

  In the check valve of the present invention, the shape of the hollow cylindrical member is not limited to the cylindrical shape as described above, and may be any hollow shape that allows fluid to flow. The shape may be a triangular prism shape, a quadrangular prism shape, or the like, or may be a shape in which the diameter continuously decreases (or increases) toward the downstream side. The length of the hollow cylindrical member (particularly the hollow cylindrical member) in the axial direction (or longitudinal direction) is, for example, about 5 to 50 cm, preferably about 7 to 30 cm, and more preferably about 10 to 20 cm, depending on the application. May be.

The number and shape of the first circulation ports can be selected according to the application and the discharge amount. The number of the 1st distribution port is not specifically limited, It can select from the range of 1-10, Preferably it is 2-5, Usually several may be sufficient. The shape of the first distribution port is not limited to an elliptical shape as in the example of the above-described figure, and may be, for example, a circular shape, a slit shape, or a polygonal shape. In particular, the length of one flow port in the axial direction (longitudinal direction, sliding direction) of the first flow port and the second flow port is set to the axial direction (longitudinal direction, sliding direction) of the other flow port. ), The overlap between the first circulation port and the second circulation port can be maintained even if the pressure receiving pressure fluctuates and the position of the second circulation port slightly shifts in the axial direction. It is possible to suppress fluctuations in circulation volume. The total area of the first flow port may be selected depending on the application, for example, 0.5～30Cm ^2, preferably 1 to 20 cm ^2, more preferably may be about ² 3 to 10 cm. In addition, the 1st circulation port may be located 2-20 cm from the other edge part front-end | tip of a hollow cylindrical member, for example, Preferably it is about 3-10 cm.

  In the hollow cylindrical member, the shape (cross-sectional shape) of the discharge port is not particularly limited as long as fluid can be discharged, and for example, any of circular shape (or circular cross-section), elliptical shape, polygonal shape, etc. There may be. In particular, the shape of the discharge port (tip portion of the discharge port) may be a shape in which a nozzle (jet nozzle) can be mounted. Further, the other end of the hollow cylindrical member can be used as a check valve even if it is not provided with a cap member, for example, when the discharge port is used with the discharge port facing downward. However, in order to stably dispose the piston member in the hollow portion of the hollow cylindrical member, a holding or supporting means (or supporting member) for preventing the piston member from dropping off is provided at the end of the hollow cylindrical member. It is preferable to provide. Such a holding means is not limited to the cap member as described above, and the other end portion (opened end portion) of the hollow cylindrical member has an opening diameter smaller than the diameter of the top portion of the piston member or the pressure receiving portion. It may be a formed open end or the like. The fixing of the cap member (or holding means) to the hollow cylindrical member is not limited to the welding as described above, and may be performed by screwing or the like.

  In the check valve of the present invention, the shape of the piston member only needs to be slidable on the hollow cylindrical member (or the hollow portion of the hollow cylindrical member), and corresponds to the hollow cylindrical member (or the hollow portion). Any shape can be used. It should be noted that at least a portion including the second flow port of the piston member only needs to be slidable on the hollow cylindrical member, and as long as the sliding of the piston member is not hindered, it is upstream of the second flow port. The part does not necessarily slide. For example, as described above, the piston member has the second circulation port on the side surface, the hollow cylindrical portion that is slidable on the hollow cylindrical member, and extends upstream from the cylindrical portion. Or a solid cylindrical piston portion having a small diameter. In the example shown in the figure, the cylindrical piston portion can be fitted to the cap member. Further, in the piston member, the shape (cross-sectional shape) of the second flow port is not limited to a circular shape as in the example of the figure, and may be, for example, an elliptical shape, a slit shape, a polygonal shape, or the like.

The second flow port can communicate with the first flow port as the piston member moves forward (or slides) in the axial direction, and can flow fluid toward the opening end. If such a second circulation port can be communicated with at least a part of the first circulation port, it is not always necessary that the entire second circulation port overlaps the first circulation port. Absent. Further, the total area of the second circulation port [or the total area of the portion that can communicate (or overlap) with the first circulation port] can be selected from the same range as in the case of the first circulation port. Depending on the size and flow rate of the hollow cylindrical member, for example, it may be about 0.3 to 25 cm ² , preferably about 0.5 to 15 cm ² , and more preferably about 1 to 7 cm ² .

  Further, the piston member can slide in the hollow portion of the hollow cylindrical member in the axial direction by the pressure receiving, but the pressure receiving may be applied to any part of the piston member, and the upstream portion in the hollow cylindrical member A wall (such as a pressure receiving wall) that closes the hollow portion may be formed. Moreover, you may form the pressure receiving wall inclined with respect to the axial direction in the side part of a piston member. In particular, a pressure receiving part may be formed on the top (or upstream end face) of the piston member. The “top” refers to a surface including at least a part or all of the upstream end surface of the piston member. The shape of the pressure receiving portion (or the top of the piston member) is usually a closed shape, and may be a flat shape as shown in the figure, such as a bulging shape, a convex shape, or a concave shape. There may be.

  The shape of the opening end of the piston member is not limited to a circular shape (or a cylindrical shape) as long as fluid can be circulated, and may be an elliptical shape, a polygonal shape, etc., and a porous shape in which a plurality of holes are formed. It may be. The cross-sectional shape of the top portion of the piston member is not particularly limited, and may be a circular shape, an elliptical shape, or the like. The piston member can circulate fluid from the second circulation port in the flow direction (direction toward the discharge port). That is, the piston member has a shape in which the fluid flowing from the flow port to the hollow portion of the piston member flows from the opening end but does not flow from the top of the piston member toward the other end of the hollow cylindrical member. . Specifically, the piston member should just be obstruct | occluded in the upstream (or upstream part of a 2nd flow port) rather than a 2nd flow port. In the example of the figure, the cylindrical piston portion located upstream from the second circulation port is non-hollow (solid), so the fluid circulated from the second circulation port is from the hollow cylindrical portion. Although the shape which does not distribute | circulate to the upstream is implement | achieved, it is good also as a shape which closed at least the piston member upstream from the 2nd circulation port (for example, the shape where only the top part obstruct | occluded the said cylindrical piston part).

  In the check valve of the present invention, the piston member may be positioned in order to efficiently communicate the second flow port with the first flow port. Such positioning is performed, for example, in the check valve by restricting the rotation of the piston member in the circumferential direction relative to the hollow cylindrical member between the hollow cylindrical member and the piston member, and hollowing the piston member. This can be done by forming a positioning unit for sliding in the axial direction of the tubular member. A specific positioning unit is formed on one side of the inner surface of the hollow cylindrical member and the outer surface of the piston member, and is formed on the other surface, and is slidable along the groove. You may comprise with a convex part. In the example of the figure, a positioning unit is configured by a groove (rail) formed in the axial direction on the inner surface of the cap member constituting the hollow cylindrical member and a convex portion formed on the outer surface of the piston member. As long as the groove part or rail is formed in the axial direction, the shape thereof is not particularly limited. Moreover, in the example of the said figure, although the rail is formed in the inner surface of the cap member which comprises a hollow cylindrical member, a rail can also be directly formed in the inner surface of a hollow cylindrical member. The number of rails is not particularly limited, and may be, for example, 1 to 10, preferably about 2 to 5, and may be usually a plurality.

  In the check valve of the present invention, the biasing member such as a spring (or a spring) can bias the piston member in the upstream direction (that is, the axial direction of the piston member (the axial direction toward the discharge port). ) Is restricted by the urging force, and the shape is not particularly limited as long as it has a shape that allows the fluid flowing from the opening end to flow toward the discharge port. For example, the spring is not limited to a coil spring, and may be any of a disc spring (or disk spring), a bamboo shoot spring, a leaf spring, an elastic spring, an air spring, and the like. Such an urging member is arranged in a form that can regulate sliding of the piston member in the axial direction by an urging force according to the type of the urging member. In addition, the urging member should just be arrange | positioned downstream from the said piston member (or opening end), as long as the pressure from a piston member (or its opening end) acts. Therefore, the urging member may not necessarily be in contact with the opening end of the piston member as in the example of the above-described figure. For example, a rectifying plate may be disposed between the opening end and the urging member. .

  As shown in the example of the figure, the check valve of the present invention may further include a baffle plate in the hollow portion on the downstream side of the urging member. The shape of the rectifying plate is not limited to a radial shape (example in the drawing) as long as it has a rectifying action, and may be a porous disk shape or the like. The rectifying plate is preferably disposed in a portion of the hollow portion of the hollow cylindrical member close to the tip of the discharge port, and is usually disposed downstream of the urging member (for example, contacting the urging member). May be arranged).

  The check valve of the present invention may include other members, such as a nozzle and a filter, as necessary. As shown in the figure, the nozzle can usually be attached to the discharge port by screwing or fitting. In the present invention, since a large amount of fluid can be circulated, when combined with a nozzle, the fluid can be discharged or sprayed at a high pressure. Moreover, a filter can be used according to a use, for example, can be used for the purpose of preventing solid matter (or foreign matter) contained in a fluid from clogging a nozzle. Such a filter has a shape corresponding to the hollow portion of the hollow cylindrical member, and can be disposed upstream of the nozzle (for example, the end of the discharge port, the upstream side of the hollow cylindrical member, etc.). .

  The check valve of the present invention is in a state where the fluid is in contact with at least the first circulation port (specifically, the fluid is not in contact with the discharge port and the fluid pressure is applied to at least the first circulation port). Can be used. In such a state, a predetermined pressure (that is, a pressure capable of contracting the urging member) is applied to at least the top of the piston member, so that the piston member moves in the axial direction (specifically, toward the discharge port). By sliding in the axial direction, the second circulation port communicates with the first circulation port, and the circulated fluid is discharged from the discharge port. The lowest pressure at which the first flow port and the second flow port communicate (or the highest pressure at which the first flow port and the second flow port do not communicate) can be set appropriately, and the liquid flow path can be opened and closed. For example, it may be about 0.01 to 10 MPa, preferably about 0.03 to 5 MPa, and more preferably about 0.05 to 1 MPa. The fluid pressure may be about A to A + 3 (MPa), preferably A + 0.1 to A + 2 MPa, and more preferably about A + 0.3 to A + 1.5 MPa, where A (MPa) is the minimum pressure.

  The pressure applied to the piston member (particularly, the top or pressure receiving portion of the piston member) can be selected depending on the application or structure, and the pressure applied to the first flow port (or the side surface of the hollow cylindrical member) The same fluid pressure may be used, or different pressures (for example, pressure acting mechanically) may be used. In particular, the check valve of the present invention has a system in which the same fluid pressure acts on at least the top of the first flow port (or the hollow cylindrical member) and the piston member (that is, the first flow port and the top portion are in contact with each other). It may be used in a form that exists in the same fluid.

  The check valve of the present invention can be used for various applications, for example, for opening and closing a flow path (for example, a flow path with a large flow rate). Therefore, when the nozzle is mounted, it can be used for cleaning the object to be processed (for example, cleaning a scale adhered to a steel material, etc.), cooling the object to be cooled, and the like.

FIG. 1 is a schematic view showing an example of the check valve of the present invention. 2 is a cross-sectional view of the check valve shown in FIG. FIG. 3 is a cross-sectional view showing a state in which the flow port A and the flow port B communicate with each other in the check valve shown in FIGS. 1 and 2. FIG. 4 is a schematic sectional view showing an example of a conventionally known check valve.

Explanation of symbols

1 ... Hollow cylindrical member 1
DESCRIPTION OF SYMBOLS 1a ... Discharge port 1b ... Cylindrical part 1c ... Circumferential wall 1d ... Rail 1e ... Cap member 2 ... Piston member 2a ... Open end 2b ... Top part 2c ... Cylindrical part 2d ... Piston part 2e ... Convex part A, B ... Distribution port 3 ... Coil spring DESCRIPTION OF SYMBOLS 4 ... Current plate 41a ... Opening part 41b ... Discharge part 41 ... Hollow cylindrical member 41c ... Hollow part 42 ... Spring 43 ... Ball

Claims (6)

  A hollow cylindrical member having a discharge port capable of discharging fluid at one end and an opening at the other end, formed on a side surface of the hollow cylindrical member, and capable of flowing fluid toward the discharge port First hollow, a hollow piston member that is slidable in the axial direction by receiving pressure in the hollow portion of the hollow cylindrical member, and has an open end on the discharge port side, and a side surface of the piston member And a second flow port that can communicate with the first flow port as the piston member moves forward in the axial direction, and can flow a fluid toward the open end, and the hollow cylinder A check valve provided with an urging member disposed on the downstream side of the piston member in the hollow portion of the shaped member and for urging the piston member in the upstream direction.   The check valve according to claim 1, wherein a pressure receiving portion is formed at the top of the piston member.   The check valve according to claim 1, wherein, of the first flow port and the second flow port, the length in the axial direction of one flow port is larger than the length in the axial direction of the other flow port.   A positioning unit for regulating the rotation of the piston member in the circumferential direction with respect to the hollow cylindrical member and for sliding the piston member in the axial direction of the hollow cylindrical member is provided between the hollow cylindrical member and the piston member. The check valve according to claim 1 formed.   A positioning unit is formed in one of the inner surface of the hollow cylindrical member and the outer surface of the piston member and extends in the axial direction, and is formed in the other surface and is slidable along the groove. The check valve according to claim 4, comprising a convex portion.   The check valve according to claim 1, further comprising a rectifying plate in a hollow portion downstream of the urging member.

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