JP5195273B2 - Check valve - Google Patents

Description

  The present invention relates to a check valve.

2. Description of the Related Art Conventionally, check valves are known that are provided at suction and discharge ports of a reciprocating compressor and are used as suction and discharge valves of the reciprocating compressor. This check valve is provided with a valve plate in the gap between the valve seat and the valve seat, allows the fluid flowing in from the valve seat side to pass, and blocks the fluid flowing in from the valve seat side by the valve plate ( For example, see Patent Document 1).
JP 2002-81380 A

However, the conventional check valve has a problem that the fluid passing through the through hole formed in the valve plate peels off from the wall surface of the through hole of the valve plate and the pressure loss of the fluid increases.
In patent document 1, the fluid which flowed into the through-hole provided in the valve seat from the valve upstream side is urged | biased by the valve seat direction, and pushes down the valve plate which obstruct | occludes the through-hole of a valve seat to a valve receiving direction. Then, the fluid passes between the depressed valve plate and the valve seat and flows into a through hole provided in the valve plate. Furthermore, the fluid that has passed through the through hole of the valve plate flows into the through hole provided in the valve receiver. And the fluid which flowed into the through-hole of the valve receiver flows out from the through-hole of the valve receiver to the valve downstream side.

8 and 9 are cross-sectional views along the normal direction of the valve plate of the conventional check valve, and are enlarged cross-sectional views in which the vicinity of the through hole of the valve plate is enlarged. In FIG. 9, the pressure in the vicinity of the inlet of the opening of the through hole is represented by an isobaric line. In FIG. 9, the darker the color is on the inner side of the isobaric line, the lower the pressure is.
As shown in FIG. 8, in the conventional check valve 100, the valve plate 40 is pushed down toward the valve receiver 30 by the fluid F flowing in from the valve seat 20 side. And the fluid F which flowed in between the valve plate 40 and the valve seat 20 flows in into the through-hole 40a of the valve plate 40 further. Here, the inlet of the opening 40f of the through hole 40a is chamfered (not shown) in normal machining, but the flow path between the valve plate 40 and the valve seat 20, the through hole 40a, Is almost vertical. Therefore, when the fluid F flowing in from the valve seat 20 side passes through the flow path between the valve plate 40 and the valve seat 20 and flows into the through hole 40a of the valve plate 40, the flow of the fluid F is changed to the valve plate. 40 and the valve receiver 30 are peeled off. As a result, as shown in FIG. 9, a large pressure loss occurs in the fluid F in the vicinity of the inlet of the opening 40f of the through hole 40a.

  In view of this, the present invention provides a check valve capable of reducing fluid pressure loss by suppressing separation of fluid flow from the valve plate and the valve receiver when the fluid flows into the through hole of the valve plate. Is to provide.

  In order to solve the above-described problems, the check valve of the present invention includes a valve plate in a gap between the valve seat and the valve receiver, and fluid that flows in the normal direction of the valve plate from the valve seat side. A non-return valve that allows the valve plate to block the fluid flowing in the normal direction from the valve receiving side, and the valve seat includes a plurality of valves that pass through the valve seat in the normal direction. A fluid introduction hole is formed, and the valve receiver has a plurality of fluid outlet holes penetrating the valve receiver in the normal direction, and the fluid introduction hole and the fluid outlet hole are formed from the normal direction. The valve plate is placed at a position that overlaps the fluid lead-out hole but not the fluid introduction hole when viewed from the normal direction. A plurality of through-holes are formed, and the openings are provided at the inlets of the openings on the valve seat side of the through-holes. Wherein the tapered surface is formed to be larger than the opening.

  With this configuration, the fluid that has flowed into the fluid introduction hole of the valve seat from the upstream side of the valve flows down between the valve plate and the valve seat by pushing down the valve plate in the valve receiving direction. The fluid that has passed between the valve plate and the valve seat flows into the through hole of the valve plate. At this time, a tapered surface formed at the inlet of the opening of the through hole of the valve plate is formed between the valve seat side surface of the valve plate and the valve seat, and is substantially perpendicular to the direction of the fluid introduction hole and the fluid outlet hole. The flow path in any direction can be shortened. In other words, by forming the tapered surface on the valve plate, the direction of the flow path connecting the fluid introduction hole and the fluid outlet hole can be made closer to the direction of the fluid introduction hole and the fluid outlet hole. Therefore, when the fluid flowing in from the valve seat side passes through the flow path between the valve seat side surface of the valve plate and the valve seat and flows into the through hole of the valve plate, the fluid flow is Peeling from the valve seat is suppressed. Thereby, it is possible to prevent pressure loss from occurring in the fluid in the vicinity of the inlet of the opening of the through hole.

  The check valve of the present invention is characterized in that the tapered surface forms an angle of 30 ° or less with the normal direction in a cross-sectional view along the normal direction.

  By configuring in this way, even when a tapered surface is formed at the inlet of the opening of the through hole of the valve plate, the contact area between the valve seat side surface of the valve plate and the valve seat is secured, A sufficient fluid sealing property can be ensured. Further, the direction of the flow path connecting the fluid introduction hole and the fluid outlet hole can be made closer to the direction of the fluid introduction hole and the fluid outlet hole.

  Further, in the check valve of the present invention, the tapered surface is continuously formed from the opening end on the valve seat side to the opening end on the valve receiving side of the through hole in a sectional view parallel to the normal direction. It is characterized by being.

  With this configuration, the tapered surface can be extended along the normal direction of the valve plate, which is the fluid inflow direction, and the fluid introduction hole and the fluid outlet hole can be connected more smoothly. Therefore, it can suppress more effectively that the fluid flow peels from the valve plate and the valve receiver. Further, the opening area of the through hole can be gradually reduced from the opening end on the valve seat side of the through hole to the opening end on the valve receiving side. Therefore, the pressure loss of the fluid can be reduced more effectively.

  In the check valve of the present invention, the tapered surface includes a curved surface.

  By comprising in this way, the valve seat side surface of a valve plate and a taper surface can be connected more smoothly. Therefore, it can suppress more effectively that the fluid flow peels from the valve plate and the valve receiver. Therefore, the pressure loss of the fluid can be reduced more effectively.

  The check valve according to the present invention is characterized in that the valve plate is composed of a plurality of plate members.

  By comprising in this way, a valve board can be formed with the board | plate material of a different material. For example, the valve plate can be formed using a plate material made of a material that reduces impact and a plate material having high strength. As a result, while maintaining the strength of the valve plate, the impact of the collision between the valve plate and the valve seat when the fluid is shut off is reduced, or the impact of the collision between the valve plate and the valve receiver when the fluid starts to flow is reduced. It can be relaxed. Further, by using a flexible and good sealing material on the valve seat side and a high strength material on the valve receiving side, both the sealing performance and strength of the valve plate can be improved.

  In the check valve of the present invention, each of the fluid introduction hole, the fluid lead-out hole, and the through-hole has a circular arrangement in which a plurality are arranged on the same circumference when viewed from the normal direction. In addition, a plurality of the circular arrays having different diameters are concentrically arranged.

  By comprising in this way, each opening area of a fluid introduction hole, a fluid derivation | leading-out hole, and a through-hole can be increased, and the pressure loss of a fluid can be reduced more effectively.

  In the check valve of the present invention, the tapered surface is formed in the through-hole constituting at least the circular array on the center side among the plurality of circular arrays having different diameters arranged concentrically. It is characterized by being.

  With this configuration, it is possible to reduce the pressure loss at the center side of the flow of the fluid having a large flow velocity.

  In the check valve according to the present invention, the through hole is formed in a long hole shape extending in a circumferential direction of the circular array.

  By comprising in this way, the opening area of a through-hole can be increased and the pressure loss of a fluid can be reduced more effectively.

  In the check valve of the present invention, the valve plate side of the fluid outlet hole is provided with a second tapered surface formed continuously with the tapered surface in a sectional view along the normal direction. It is characterized by.

  With this configuration, the angle of the tapered surface can be set more freely, and the cross-sectional areas of the through hole of the valve plate and the fluid outlet hole of the valve receiver can be enlarged.

  According to the present invention, when the fluid flows into the through hole of the valve plate, the check valve can suppress the fluid flow from being separated from the valve plate and the valve receiver and reduce the pressure loss of the fluid. Can be provided.

  Hereinafter, embodiments of the present invention will be described with reference to the drawings. In the following drawings, the scale is appropriately changed for each member so that each member has a size that can be recognized on the drawing.

FIG. 1 is a perspective view of the check valve 1 of the present embodiment, and FIG. 2 is a partial cross-sectional view of the check valve 1 shown in FIG. The check valve 1 of the present embodiment is provided, for example, at a suction port and a discharge port of a reciprocating compressor that compresses BOG (Boil Off Gas) generated by heat input to LNG (Liquefied Natural Gas). It is used as a valve and a discharge valve.
As shown in FIGS. 1 and 2, the check valve 1 includes a seat (valve seat) 2 disposed on the upstream side of the fluid F and a guide (valve receiver) 3 disposed on the downstream side of the fluid F. I have. The sheet 2 and the guide 3 are formed in a substantially cylindrical shape having substantially the same diameter, and are arranged so as to overlap with the inflow direction of the fluid F (the arrow direction in the figure).

  As shown in FIG. 2, the outer peripheral portion 2 a of the surface of the sheet 2 on the guide 3 side is in close contact with the outer peripheral portion 3 a of the surface of the guide 3 on the sheet 2 side. A recess 3 b is formed on the surface of the guide 3 on the sheet 2 side, and a gap S is formed between the sheet 2 and the guide 3. A disc-shaped plate (valve plate) 4 is accommodated in the recess 3 b, and the plate 4 is disposed in the gap S between the seat 2 and the guide 3.

  As shown in FIGS. 1 and 2, a plurality of fluid introduction holes 2 b that penetrate the sheet 2 in the normal H direction of the plate 4 are formed in the sheet 2. The fluid introduction holes 2b have a circular arrangement in which a plurality of fluid introduction holes 2b are arranged on the same circumference when viewed from the normal H direction of the plate 4, and a plurality of circular arrangements having different diameters are concentric. Is arranged. Further, the fluid introduction hole 2b has a long hole shape extending in the circumferential direction of each circular arrangement.

  As shown in FIG. 2, a plurality of fluid outlet holes 3 c are formed in the guide 3. The fluid outlet hole 3 c is provided so as to penetrate the guide 3 in the normal H direction of the plate 4. The fluid lead-out holes 3 c of the guide 3 and the fluid introduction holes 2 b of the sheet 2 are alternately formed in the surface direction of the plate 4, and are arranged at positions shifted from the normal line H direction of the plate 4. That is, the fluid outlet hole 3 c of the guide 3 and the fluid inlet hole 2 b of the sheet 2 do not overlap each other when viewed from the normal line H direction of the plate 4.

  The fluid outlet hole 3c of the guide 3 is a circle in which a plurality of fluid outlet holes 3c are arranged on the same circumference as seen from the normal line H direction of the plate 4 in the same manner as the fluid inlet hole 2b of the sheet 2 shown in FIG. A plurality of circular arrays having different diameters are arranged concentrically. Further, the fluid outlet hole 3c of the guide 3 has a long hole-like shape extending in the circumferential direction of each circular arrangement, like the fluid introduction hole 2b of the sheet 2 shown in FIG.

  As shown in FIG. 2, the plate 4 has a plurality of positions that do not overlap with the fluid introduction hole 2 b of the sheet 2 but overlap with the fluid outlet hole 3 c of the guide 3 when viewed from the normal H direction of the plate 4. A through hole 4a is formed. The through hole 4 a is provided so as to penetrate the plate 4 in the normal H direction of the plate 4. In addition, a round bar-shaped spindle 5 is provided so as to pass through the central portion of the sheet 2, the guide 3, and the plate 4 in the normal line H direction of the plate 4, and the plate 4 is fixed to the spindle 5.

  A male screw portion 5 a is formed at the proximal end portion of the spindle 5 on the guide 3 side. A male screw part 5 a at the base end of the spindle 5 is screwed into a female screw part 3 d provided at the center of the guide 3 and fixed to the guide 3. The spindle 5 is provided such that a tip portion opposite to the base end portion where the male screw portion 5a is formed protrudes to the upstream side of the fluid F.

  A male screw portion 5 b is formed on the upstream side of the fluid F with respect to the sheet 2 at the center of the spindle 5. A nut 6 is screwed into the male screw portion 5 b at the center of the spindle 5, and a washer 7 is inserted between the nut 6 and the seat 2. Thereby, the sheet 2 and the guide 3 are integrally fixed, and a pressing force is applied between the outer peripheral portion 2a of the surface of the sheet 2 on the guide 3 side and the outer peripheral portion 3a of the surface of the guide 3 on the sheet 2 side. Has been.

FIG. 3 is a side view showing the plate 4 and the spindle 5. FIG. 4 is a plan view of a plate material constituting the plate 4, where (a) shows the valve plate 41 and (b) shows the backing plate 42.
As shown in FIG. 3, the plate 4 is composed of two plate members, a valve plate 41 and a backing plate 42, and is fixed to a spindle 5 that passes through a through hole 4 b provided in the center. The valve plate 41 and the backing plate 42 are disposed so as to overlap in the axial direction of the spindle 5, the valve plate 41 is disposed on the seat 2 side, and the backing plate 42 is disposed on the guide 3 side.

  As shown in FIGS. 4A and 4B, spring portions 4 d are provided on both the valve plate 41 and the backing plate 42 around the central portion 4 c of the plate 4 fixed to the spindle 5. Yes. The spring part 4d is formed in an arcuate band shape by forming arcuate cutouts on the outside and inside of the spring part 4d. Thereby, the spring part 4d connects a part of the center part 4c and a part of the outer peripheral part 4e on the opposite side to 180 °. The spring portion 4d is elastically deformed when a predetermined force is applied in the normal H direction of the plate 4, and the outer peripheral portion 4e of the plate 4 in which the through hole 4a is formed moves in the normal H direction of the plate 4. Thus, a predetermined elastic coefficient is set.

  Similar to the fluid introduction hole 2b of the sheet 2 shown in FIG. 1, the through-hole 4a of the plate 4 is a circular shape in which a plurality of through-holes 4a are arranged on the same circumference when viewed from the normal line H direction of the plate 4. A plurality of circular arrays having different diameters are arranged concentrically. Further, the through holes 4 a of the plate 4 have a long hole shape extending in the circumferential direction of a circular arrangement, like the fluid introduction holes 2 b of the sheet 2 and the fluid outlet holes 3 c of the guide 3.

FIG. 5 is an enlarged cross-sectional view of a main part of the check valve 1 shown in FIGS. 1 and 2.
As shown in FIG. 5, a tapered surface 4 t is formed in the through hole 4 a of the plate 4. The tapered surface 4t is provided so as to be inclined by an angle θ with respect to the normal H direction of the plate 4 so that the opening 4f on the sheet 2 side is larger than the opening 4g on the guide 3 side. The tapered surface 4t is formed so as to form an angle θ of 30 ° or less with the normal H direction in a cross-sectional view parallel to the normal H direction of the plate 4. Further, the tapered surface 4t is a cross-sectional view parallel to the normal H direction of the plate 4 and the edge (opening end) of the opening 4f on the sheet 3 side of the through hole 4a (opening end) from the edge (opening end) of the opening 4g on the guide 3 side. Is continuously formed.

Next, the operation of this embodiment will be described with reference to FIGS.
FIG. 6 is an enlarged cross-sectional view of the main part showing the flow of the fluid F from the seat 2 side to the guide 3 side. FIG. 7 is an enlarged cross-sectional view of the main part showing the pressure distribution of the fluid F flowing from the seat 2 side to the guide 3 side. In FIG. 7, the pressure in the vicinity of the inlet of the opening 4f of the through hole 4a is represented by an isobar. In FIG. 7, the darker the color is on the inner side of the isobar, the lower the pressure.

  For example, when the check valve 1 of the present embodiment is used as a discharge valve by being attached to a discharge port pipe of a reciprocating compressor (not shown), the seat 2 side of the check valve 1 shown in FIGS. It arrange | positions so that it may become a discharge outlet side (upstream side of the fluid F). Further, when used as a suction valve by being attached to a pipe of the suction port, the check valve 1 is arranged so that the guide 3 side is on the suction port side (downstream side of the fluid F).

  When the reciprocating compressor sucks the fluid F from the suction port, in the check valve 1 provided at the suction port of the reciprocating compressor, the fluid F on the guide 3 side connected to the suction port via a pipe. Becomes a lower pressure than the fluid F on the seat 2 side. Due to the pressure difference of the fluid F, a force in the direction of the guide 3 in the normal H direction of the plate 4 acts on the plate 4 of the check valve 1. By this force, the spring portion 4d of the plate 4 shown in FIG. 4 is elastically deformed and the outer peripheral portion 4e moves to the guide 3 side, so that the plate 4 moves to the guide 3 side as shown in FIG. Then, as shown in FIG. 6, the fluid F that has flowed into the fluid introduction hole 2 b of the sheet 2 flows into the fluid outlet hole 3 c of the guide 3 through the flow path formed between the sheet 2 and the plate 4. . The fluid F flowing into the fluid outlet hole 3c of the guide 3 is discharged from the guide 3 side to the outside of the check valve 1 and flows into the suction port of the reciprocating compressor.

On the other hand, in the check valve 1 provided at the discharge port of the reciprocating compressor, the fluid F on the seat 2 side connected to the discharge port via a pipe has a lower pressure than the fluid F on the guide 3 side. Due to the pressure difference of the fluid F, a force in the direction of the seat 2 in the normal H direction of the plate 4 acts on the plate 4 of the check valve 1. By this force, the spring portion 4d of the plate 4 shown in FIG. 4 is elastically deformed and the outer peripheral portion 4e moves to the seat 2 side. As a result, the plate 4 moves to the sheet 2 side as shown in FIG. Then, the valve plate 41 disposed on the seat 2 side of the plate 4 contacts the seat 2. As a result, the fluid introduction hole 2b of the sheet 2 is closed, and the flow of the fluid F from the fluid outlet hole 3c of the guide 3 to the fluid introduction hole 2b of the sheet 2 is blocked.
In this way, by using the check valve 1 of the present embodiment for the suction port and the discharge port of the reciprocating compressor, when the fluid F is sucked by the reciprocating compressor, the fluid F flows into the discharge port. The fluid F can be sucked from the suction port by blocking.

  Further, when the fluid F compressed by the reciprocating compressor is discharged from the discharge port, the check valve 1 provided at the discharge port of the reciprocating compressor has a seat 2 connected to the discharge port via a pipe. The fluid F on the side becomes a higher pressure than the fluid F on the guide 3 side. Due to the pressure difference of the fluid F, a force in the direction of the guide 3 in the normal H direction of the plate 4 acts on the plate 4 of the check valve 1. By this force, the spring portion 4d of the plate 4 shown in FIG. 4 is elastically deformed, and the outer peripheral portion 4e moves to the guide 3 side. As a result, the plate 4 moves toward the guide 3 as shown in FIG. Then, the fluid F that has flowed into the fluid introduction hole 2b of the sheet 2 flows into the fluid outlet hole 3c of the guide 3 through a flow path formed between the sheet 2 and the plate 4, as shown in FIG. . The fluid F that has flowed into the fluid outlet hole 3 c of the guide 3 is discharged from the guide 3 side to the outside of the check valve 1.

On the other hand, in the check valve 1 provided at the suction port of the reciprocating compressor, the fluid F on the guide 3 side connected to the suction port via a pipe has a higher pressure than the fluid F on the seat 2 side. Due to the pressure difference of the fluid F, a force in the direction of the seat 2 in the normal H direction of the plate 4 acts on the plate 4 of the check valve 1. By this force, the spring portion 4d of the plate 4 shown in FIG. 4 is elastically deformed and the outer peripheral portion 4e moves to the seat 2 side. As a result, the plate 4 moves to the sheet 2 side as shown in FIG. Then, the valve plate 41 disposed on the seat 2 side of the plate 4 contacts the seat 2. As a result, the fluid introduction hole 2b of the sheet 2 is closed, and the flow of the fluid F from the fluid outlet hole 3c of the guide 3 to the fluid introduction hole 2b of the sheet 2 is blocked.
Thus, by using the check valve 1 of the present embodiment for the suction port and the discharge port of the reciprocating compressor, when the fluid F is discharged by the reciprocating compressor, the fluid F flows out from the suction port. The fluid F can be discharged from the discharge port by blocking.

  Here, in the check valve 1 of the present embodiment, a tapered surface 4 t is formed in the through hole 4 a of the plate 4. Therefore, as shown in FIG. 6, when the fluid F flows from the fluid introduction hole 2b of the sheet 2 and flows into the through hole 4a of the plate 4, it is substantially perpendicular to the direction of the fluid introduction hole 2b and the fluid outlet hole 3c. The flow path in the direction can be shortened compared to the conventional case. That is, by forming the tapered surface 4t on the plate 4, the direction of the flow path connecting the fluid introduction hole 2b and the fluid outlet hole 3c can be made closer to the direction of the fluid introduction hole 2b and the fluid outlet hole 3c.

  Thereby, when the fluid F flowing in from the fluid introduction hole 2b of the sheet 2 passes through the flow path between the plate 4 and the sheet 2 and flows into the through hole 4a of the plate 4, the flow of the fluid F is conventionally changed. Can be more linear. Therefore, the flow of the fluid F is suppressed from being separated from the surfaces of the plate 4 and the guide 3. As shown in FIG. 7, the pressure distribution in the vicinity of the inlet of the opening 4f of the through hole 4a is generally lighter than the pressure distribution of the conventional check valve 100 shown in FIG. 9, and the pressure drop is suppressed. Has been. Therefore, the taper surface 4t can suppress the occurrence of pressure loss in the fluid F. According to the check valve 1 of the present embodiment, the pressure loss can be reduced to, for example, about 2/3 of the conventional check valve.

  Further, in the check valve 1 of the present embodiment, the tapered surface 4t has an angle θ of 30 ° or less with the normal H direction of the plate 4 in a cross-sectional view along the normal H direction of the plate 4 as shown in FIG. It is formed to make. Therefore, even when the tapered surface 4t is formed in the through hole 4a of the plate 4, a contact area between the valve plate 41 arranged on the seat 2 side of the plate 4 and the seat 2 can be secured. Thereby, the sealing performance of the fluid F can be sufficiently ensured. Further, the direction of the flow path connecting the fluid introduction hole 2b and the fluid outlet hole 3c can be made closer to the direction of the fluid introduction hole 2b and the fluid outlet hole 3c.

Further, in the check valve 1 of the present embodiment, the tapered surface 4t has a guide 3 side from the opening end on the seat 2 side of the through hole 4a in a cross-sectional view along the normal H direction of the plate 4 as shown in FIG. It is continuously formed over a plurality of plate materials up to the opening end of. Therefore, the taper surface 4t can be extended in the normal line H direction of the plate 4 that is the inflow direction of the fluid F, and the fluid introduction hole 2b and the fluid outlet hole 3c can be connected more smoothly. Therefore, the flow of the fluid F can be made more linear, and the flow of the fluid F can be more effectively suppressed from being separated from the plate 4 and the guide 3.
Further, the opening area of the through hole 4a can be gradually reduced from the opening end on the sheet 2 side of the through hole 4a to the opening end on the guide 3 side. Therefore, the opening area of the through-hole 4a can be prevented from changing suddenly, and the pressure loss of the fluid F can be reduced more effectively.

Further, in the check valve 1 of the present embodiment, the plate 4 is formed by two plate members, a valve plate 41 and a backing plate 42. Therefore, the plate 4 can be formed of a plurality of plate materials made of different materials. For example, it is possible to form a plate 4 in which a plate material having a high strength is used as the material of the valve plate 41 and the backing plate 42 and a plate material made of a material that alleviates impact is sandwiched therebetween. As a result, the impact of the collision between the plate 4 and the sheet 2 when the fluid F is interrupted is reduced while the strength of the plate 4 is secured, or the collision between the plate 4 and the guide 3 when the fluid F starts to flow. Can alleviate the impact.
Further, by using a flexible and good sealing material for the valve plate 41 and a high-strength material for the backing plate 42, both the sealing performance and strength of the plate 4 can be improved.

  In the check valve 1 of the present embodiment, the fluid introduction hole 2b of the seat 2, the through hole 4a of the plate 4, and the fluid outlet hole 3c of the guide 3 are the same when viewed from the normal H direction of the plate 4. The circular arrangement is arranged on the circumference, and a plurality of circular arrangements having different diameters are arranged concentrically. Further, the fluid introduction hole 2b of the sheet 2, the through hole 4a of the plate 4, and the fluid outlet hole 3c of the guide 3 each have a long hole shape extending in the circumferential direction of a circular arrangement. Therefore, the respective opening areas of the fluid introduction hole 2b, the fluid outlet hole 3c, and the through hole 4a can be increased, and the pressure loss of the fluid F can be reduced more effectively.

  As described above, according to the check valve 1 of the present embodiment, when the fluid F flows into the through hole 4 a of the plate 4, the flow of the fluid F is prevented from being separated from the plate 4 and the guide 3. Thus, the pressure loss of the fluid F can be reduced.

Next, a modified example of the check valve 1 of the present embodiment will be described.
FIG. 8 is an enlarged cross-sectional view of a check valve according to this modification corresponding to FIG. 6 of the check valve 1 of the above-described embodiment.

As shown in FIG. 8, in the check valve of the present modification, a second tapered surface 3t formed continuously with the tapered surface 4t is provided on the plate 4 side of the fluid outlet hole 3c of the guide 3. .
By forming the tapered surface 3t on the guide 3 side in this way, the angle of the tapered surface 4t of the plate 4 can be set more freely. Therefore, the cross-sectional area of the through hole 4a and the fluid outlet hole 3c of the guide 3 can be enlarged, and the pressure loss of the fluid F can be reduced.

The present invention is not limited to the above-described embodiment, and various modifications can be made without departing from the spirit of the present invention.
For example, the tapered surface may not be formed continuously from the opening end on the sheet side to the opening end on the guide side as described in the above embodiment, and at least at the entrance of the opening on the sheet side of the through hole. What is necessary is just to be provided.

  The tapered surface provided in the through hole of the plate may include a curved surface. Thereby, the sheet | seat side surface and taper surface of a plate can be connected more smoothly. And it can suppress more effectively that the flow of fluid peels from a plate and a guide. Therefore, the pressure loss of the fluid can be reduced more effectively.

  Moreover, you may make it form a taper surface in some of the several through-holes of a plate. In this case, if a tapered surface is formed in a through hole constituting at least the center side (spindle side) circular array among a plurality of circular arrays having different diameters arranged concentrically in the through hole, Good. Thereby, the pressure loss in the center side of the flow of the fluid with a large flow velocity can be reduced.

  In addition, the fluid introduction hole of the sheet, the through hole of the plate, and the fluid outlet hole of the guide may have a circular shape, an elliptical shape, a polygonal shape, or the like instead of the long hole shape.

It is a perspective view of a check valve in an embodiment of the present invention. It is a fragmentary sectional view of the check valve shown in FIG. It is a side view which shows the plate and spindle of a non-return valve shown in FIG. It is a top view of the board | plate material which comprises the plate of the non-return valve shown in FIG. 1, (a) is a top view of a valve plate, (b) is a top view of a backing plate. It is an expanded sectional view of the principal part of the non-return valve shown in FIG. It is an expanded sectional view which shows the flow of the fluid in the principal part of the non-return valve shown in FIG. It is an expanded sectional view which shows the pressure distribution in the principal part of the non-return valve shown in FIG. FIG. 7 is an enlarged cross-sectional view corresponding to FIG. 6 according to a modification of the check valve shown in FIG. 1. It is an expanded sectional view which shows the flow of the fluid in the principal part of the conventional check valve. It is an expanded sectional view which shows the pressure distribution in the principal part of the conventional check valve.

Explanation of symbols

1 check valve, 2 seat (valve seat), 2b fluid introduction hole, 3 guide (valve receiver), 3c fluid outlet hole, 4 plate (valve plate), 41 valve plate (plate material), 42 backing plate (plate material), 4a Through hole, 4f Opening (opening end), 4g Opening (opening end), 4t Taper surface, F fluid, H normal, S gap, θ angle

Claims (9)

The fluid is provided with a valve plate in a gap between the valve seat and the valve receiver, allows the fluid flowing in the normal direction of the valve plate from the valve seat side to pass therethrough, and flows in the normal direction from the valve seat side A check valve that shuts off by the valve plate,
The valve seat is formed with a plurality of fluid introduction holes penetrating the valve seat in the normal direction,
The valve receiver is formed with a plurality of fluid outlet holes penetrating the valve receiver in the normal direction,
The fluid introduction hole and the fluid outlet hole are disposed at positions shifted from the normal direction,
The valve plate is formed with a plurality of through holes penetrating the valve plate in the normal direction at positions that do not overlap the fluid introduction hole as viewed from the normal direction but overlap the fluid outlet hole. ,
A check valve characterized in that a tapered surface is formed at an inlet of an opening on the valve seat side of the through hole so that the opening is larger than an opening on the valve receiving side.   2. The check valve according to claim 1, wherein the tapered surface forms an angle of 30 ° or less with the normal direction in a sectional view along the normal direction.   The taper surface is formed continuously from the opening end on the valve seat side to the opening end on the valve receiving side of the through hole in a cross-sectional view along the normal direction. Alternatively, the check valve according to claim 2.   The check valve according to claim 1, wherein the tapered surface includes a curved surface.   The check valve according to any one of claims 1 to 4, wherein the valve plate includes a plurality of plate members.   Each of the fluid introduction hole, the fluid lead-out hole, and the through-hole has a circular arrangement in which a plurality are arranged on the same circumference when viewed from the normal direction, and a plurality of the circular shapes having different diameters. 6. The check valve according to any one of claims 1 to 5, wherein the array is arranged concentrically.   The taper surface is formed in the through-hole constituting the circular array at least on the center side among the plurality of circular arrays having different diameters arranged concentrically. Check valve.   The check valve according to claim 6 or 7, wherein the through hole is formed in a long hole shape extending in a circumferential direction of the circular array.   2. The second tapered surface formed continuously with the tapered surface in a sectional view along the normal direction is provided on the valve plate side of the fluid outlet hole. The check valve according to any one of claims 8 to 9.

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