JP5651730B2 - Check valve - Google Patents

Description

  The present invention relates to a check valve that is opened by the pressure of a forward flow of fluid and is closed by the pressure of the reverse flow of fluid and the weight of a valve body.

  Conventionally, in a vapor compression refrigeration cycle, a check valve is frequently used as an element constituting a circuit of the cycle. The check valve is intended to close the flow path by opening the valve by a forward flow of fluid to form a flow path and closing the valve by a reverse flow.

  In addition, as a check valve, in general, in order to ensure the valve closed state and to ensure the freedom of the installation posture, the valve body is biased with a spring, and when the valve is opened. In order to reduce the valve opening pressure loss, there is a “differential differential pressure operation type” in which the spring that biases the valve body is removed and the valve is closed by its own weight.

  In recent years, there are many demands for environmental consideration, energy saving, and noise reduction, and there is a tendency to use a “slightly differential pressure actuated” check valve. As this “fine differential pressure actuated” check valve, for example, there is one disclosed in Patent Document 1.

  The check valve disclosed in Patent Document 1 is provided on a valve body, and is provided with a fluid that urges the valve body in a direction orthogonal to the flow path direction by receiving a force of a fluid flow when the valve body is opened. Force means. Therefore, it is easy to open the valve even at a low differential pressure, a large flow rate can be secured, and further, quietness can be obtained.

  However, the check valve having such a configuration does not include a valve closing urging means such as a spring for urging the valve body when the valve is closed. When the check valve is placed immediately after the compressor or when the piping is curved, there is a swirling component such as a swirl in the fluid flowing through the check valve. Therefore, in a check valve that closes due to its own weight, there is a risk that the valve body will rotate inside the valve body (valve chamber) due to the swirling component of the fluid in the valve open state, which may cause abnormal noise, The life of the check valve is shortened due to deformation and wear. On the other hand, a check valve provided with a spring as a valve closing biasing means can prevent the valve body from rotating, but in order to open the valve, a fluid pressure exceeding the spring biasing force is required. Furthermore, the number of parts increases, which is not preferable.

Japanese Patent No. 4806442

  Therefore, the present invention has been made in view of the above problems, and an object of the present invention is to provide a check valve that can suppress the rotation of the valve body due to the swirling component of the fluid without increasing the number of parts.

The invention described in claim 1 includes a valve body provided with a valve seat member and a stopper portion, a disc portion, and a plurality of guide portions protruding from the outer periphery of the disc portion, A non-return check that includes a valve body that is movable between a valve seat member and the stopper portion and that can be closed by its own weight, and that forms a fluid passage on the outer periphery of the disc portion by a gap between adjacent guide portions. In the valve, a convex portion that protrudes to the inside of the valve body is provided at a portion of the valve main body corresponding to a range in which the valve body moves, and the convex portion is a convex portion that can prevent the valve body from rotating. In addition, the check valve is disposed between the adjacent guide portions .

The invention described in claim 2 includes a cylindrical valve body provided with a valve seat member and a stopper portion, and a disc portion and a plurality of guide portions protruding from the outer periphery of the disc portion. And a valve body that is movable between the valve seat member and the stopper portion and can be closed by its own weight, and a fluid passage is formed on the outer periphery of the disc portion by a gap between the adjacent guide portions. In the check valve, the plurality of guide portions are slidably guided on the inner peripheral surface of the valve body when moving between the valve seat member and the stopper portion, and the valve body moves within a range. The corresponding inner peripheral surface of the valve main body is provided with a convex portion protruding inward of the valve main body, and the convex portion is a convex portion that can prevent the valve body from rotating, and the adjacent guide portion It is a check valve characterized by being arranged in between .

According to a third aspect of the present invention, there is provided a valve body formed in a cylindrical shape and provided with a valve seat member and a stopper portion disposed at an axial interval from the valve seat member, a disc portion, A plurality of guide portions projecting from the outer peripheral surface of the disc portion, the disc portion overlaps the valve seat member by its own weight, and the disc portion is separated from the valve seat member by a fluid flow. A check valve in which a fluid passage is formed between the guide portions adjacent to each other in a valve open state. A convex portion that protrudes inward of the valve main body is provided at a portion of the valve main body corresponding to a range in which the valve moves , and when viewed from the axial direction of the valve main body , at least a tip of the convex portion inside of a circle connecting the tip of each of the plurality of guide portions in a state Positioned, said convex portion, with a convex portion capable of preventing rotation of the valve body, a check valve, characterized in that it is disposed between the guide portion adjacent.

The invention described in claim 4 is the invention described in any one of claims 1 to 3, wherein a plurality of the convex portions are provided side by side in the moving direction of the valve body. it is characterized in that there.

  The invention described in claim 5 is the invention described in any one of claims 1 to 3, wherein the convex portion is formed between the valve seat member and the stopper portion. It is set so that it may contact | abut with the said guide part when moving.

The invention described in claim 6, an invention described in any one of claims 1 to 3, wherein the convex portion is provided prior to the inside of the Kiben body, movement of the valve body It is characterized by being a ridge along the direction.

  The invention described in claim 7 is the invention described in any one of claims 1 to 3, wherein the convex portion is integrally formed with the valve body by integral molding. It is a feature.

  The invention described in claim 8 is the invention described in any one of claims 1 to 3, wherein a plurality of the convex portions are provided.

  The invention described in claim 9 is the invention described in any one of claims 1 to 3, wherein the introduction pipe for introducing the fluid into the check valve and the fluid are introduced into the check valve. At least one of the lead-out pipes led out from is provided in the valve body by integral molding.

  The invention described in claim 10 is the invention described in any one of claims 1 to 3, wherein the introduction pipe for introducing the fluid into the check valve and the fluid are introduced into the check valve. Both of the lead-out pipes led out from are provided on the valve body by integral molding.

  The invention described in claim 11 is the invention described in any one of claims 1 to 3, wherein the valve seat member is attached by being press-fitted into the valve body. It is a feature.

  The invention described in claim 12 is the check valve according to claim 11, wherein a concave portion is formed in an outer peripheral portion of the valve seat member, and the valve corresponding to the concave portion of the valve seat member is formed. The valve seat member is caulked and fixed to the valve main body by pressing a predetermined portion of the main body from the outside.

  The invention described in claim 13 is the invention described in any one of claims 1 to 3, wherein the length of the convex portion in the direction in which the valve body moves is the movement of the valve body. It is set so that it may contact | abut with the said valve body over the range.

  The invention described in claim 14 is the invention described in any one of claims 1 to 13, wherein the length from the inner peripheral surface of the valve body to the apex of the convex portion is the valve. It is in the range of 2 to 20% of the inner diameter of the main body.

  According to the present invention, since the convex portion is provided on the valve body, when installed immediately after the compressor or immediately after the curved pipe, the swirl component exists in the fluid, and the valve is caused by the swirl component of the fluid. Even if the body starts to rotate, the guide portion of the valve body can come into contact with the convex portion of the valve body. Thereby, the valve body cannot rotate any more. That is, the rotation of the valve body can be physically stopped. Thereby, the abnormal noise which arises by rotation of a valve body can be suppressed, and it can silence. Further, the deformation and wear of the valve body can be suppressed, and the life of the check valve can be maintained.

  Further, according to the present invention, the plurality of guide portions are slidably guided to the inner peripheral surface of the valve body when moving between the valve seat member and the stopper portion, and correspond to the range in which the valve body moves. Since the convex part that protrudes to the inside of the valve body is provided in the part of the valve body that performs, when installed immediately after the compressor or immediately after the curved pipe, there is a swirl component in the fluid, Even if the valve body begins to rotate due to the swirling component, the guide portion of the valve body can abut against the convex portion of the valve body. Thereby, the valve body cannot rotate any more. That is, the rotation of the valve body can be physically stopped. Thereby, the abnormal noise which arises by rotation of a valve body can be suppressed, and it can silence. Further, the deformation and wear of the valve body can be suppressed, and the life of the check valve can be maintained.

  Further, according to the present invention, the convex portion that protrudes inward of the valve body is provided at a portion corresponding to the range in which the valve body moves in the cylindrical valve body, and the convex portion is at least in a valve open state. Are installed so as to overlap with the circles connecting the tips of the plurality of guide portions, respectively, when installed immediately after the compressor or immediately after the curved pipe, there is a swirl component in the fluid, Even if the valve body starts to rotate due to the swirling component, the guide portion of the valve body comes into contact with the convex portion of the valve body. For this reason, the rotation of the valve body can be physically stopped by restricting the rotation of the valve body. Thereby, the abnormal noise which arises by rotation of a valve body can be suppressed, and it can silence. Further, the deformation and wear of the valve body can be suppressed, and the life of the check valve can be maintained.

  Furthermore, since the convex portion is integrally formed with the valve body by integral molding, the manufacturing process can be simplified and the manufacturing can be easily performed without increasing the number of parts. Further, since the valve main body and the convex portion are integrally formed, a step such as welding is not required, and the stability can be improved.

  Furthermore, the convex part is a protrusion provided inside the valve body along the moving direction of the valve body, so that a conventional mold can be used, and the convex part manufactured as a single unit is assembled to the valve body. It can be manufactured easily.

  Furthermore, the rotation of the valve body can be reliably prevented by installing a plurality of convex portions corresponding to each guide portion. Further, dividing one long convex portion into several short convex portions is advantageous in terms of fluidity of the fluid, and the influence on the fluid flow can be reduced.

  Furthermore, by connecting at least one of the introduction pipe and the lead-out pipe to the valve body by integral molding, the connection portion of the check valve can be reduced, and fluid leaks to the outside of the check valve. The possibility of occurrence is reduced, and the stability of the check valve can be improved.

  Furthermore, since both the introduction pipe and the lead-out pipe are formed by integral molding in the valve body, there is no connection part in the check valve, so fluid leakage to the outside of the check valve can occur. And the stability of the check valve can be improved.

  Furthermore, since the valve seat member is attached to the valve body by press fitting, the seal between the valve body and the valve seat member can be sealed, so that a seal member such as an O-ring is not necessary, and the number of parts is increased. There is no invitation.

  Furthermore, the valve seat member is firmly attached to the valve body by caulking and fixing the valve seat member to the valve body.

  Furthermore, the length of the convex portion is set so as to contact the valve body over the moving range of the valve body, so that the rotation of the valve body can be stopped regardless of the opening degree of the check valve.

  Furthermore, by making the length from the inner peripheral surface of the valve main body to the apex of the convex portion within a range of 2 to 20% of the inner diameter of the valve main body, the convex portion prevents movement of the valve body in the valve opening / closing direction. The rotation of the valve body can be stopped without fail.

It is a figure which shows the non-return valve which concerns on one Example of this invention. It is a top view seen from the XX line of FIG. It is a figure which shows the other Example of the non-return valve of FIG.

Hereinafter, a check valve according to the present invention will be described with reference to the drawings.

  The check valve 10 is a vertically installed check valve, and includes a metal valve body 1, a valve seat member 2 as a “valve seat portion”, and a valve body 3. The valve body 1 is formed by integrally molding (for example, press working) an inlet tube portion 11 and a lead tube portion 12 having a small diameter, and forming a valve chamber 13 having a large diameter at the center thereof. Further, a stopper portion 4 is formed at a boundary portion between the outlet pipe portion 12 and the valve chamber 13 of the valve body 1. A valve port 21 is formed at the center of the valve seat member 2, and the valve seat member 2 is attached by being press-fitted into the introduction pipe portion 11 in the valve chamber 13. Further, the concave portion 22 formed on the outer periphery of the valve seat member 2 and the caulking portion 1a that presses a predetermined portion of the valve body 1 corresponding to the concave portion 22 formed on the outer periphery of the valve seat member 2 from the outside are fixed by caulking. ing. The caulking portion 1a may be formed by roll caulking that performs caulking over the entire circumference, or may be formed by performing partial caulking (for example, punching) at a plurality of locations. A convex portion 5 is provided on the inner peripheral surface of the valve body 1, that is, on the inner surface of the valve chamber 13. The valve body 3 is inserted and disposed between the valve seat member 2 and the stopper portion 4.

  As shown in FIG. 2, the valve element 3 includes three guide portions 31 and a disc-shaped disc portion 32. The valve body 3 is a synthetic resin member, and the guide portion 31 and the disc portion 32 are integrally formed. The guide portion 31 protrudes from the outer periphery of the disc portion 32, and the guide portion 31 is slidably guided by the inner peripheral surface of the valve chamber 13 (the inner peripheral surface of the valve body 1). It moves between the position indicated by the broken line in FIG. 1 and the position indicated by the solid line in FIG.

  2 is a cross-sectional view taken along line XX of FIG. A convex portion 5 that protrudes inward of the valve body 1 is provided at a portion of the valve body 1 corresponding to a range in which the valve body 3 moves. Further, the convex portion 5 can prevent the valve body 3 from rotating, so that the convex portion 5 is in contact with the guide portion 31 when the valve body 3 moves between the valve seat member 2 and the stopper portion 4. Is set. In the present embodiment, one convex portion 5 is provided on the valve body 1, but one or more, for example, a convex portion is provided according to the number of guide portions 31, and three convex portions can be provided here. It is. The convex portion 5 is made of metal, and may be integrally formed with the valve body 1 by integral molding (for example, pressing) when the valve body 1 is manufactured by integral molding (for example, pressing), After the conventional valve body 1 is manufactured, the protrusions 5 that are protrusions manufactured as a single unit may be joined to the inside of the valve body 1 by a joining method such as welding. In consideration of simplification of the manufacturing process, cost reduction, and stability, in this embodiment, the convex portion is formed integrally with the valve body 1 by press working.

  2, A is the inner diameter of the valve chamber 13 of the valve body 1, and B is the length from the inner peripheral surface of the valve chamber 13 of the valve body 1 to the apex of the convex portion 5, that is, the protrusion amount of the convex portion 5. It is. If the protruding amount of the convex portion 5 is smaller than 2% of the inner diameter A of the valve chamber 13 of the valve body 1, it is insufficient to stop the rotation of the valve body 3, and in the worst case, the valve chamber 13 of the valve body 1 There is a possibility that the valve body 3 may be fitted between the inner periphery and the convex portion 5. Further, when the protruding amount B of the convex portion is larger than 20% of the inner diameter A of the valve chamber 13 of the valve body 1, the fluid flow is hindered by the convex portion. Therefore, the protrusion amount B of the convex portion 5 is preferably 2 to 20% of the inner diameter A of the valve chamber 13 of the valve body 1. Within this range, the rotation of the valve body 3 can be reliably stopped without obstructing the flow of fluid by the convex portion 5.

  Further, the length of the convex portion 5 can be brought into contact with the valve body 3 over the movement range of the valve body 3 in order that the guide portion 31 of the valve body 3 always makes contact with the convex portion 5 of the valve body 1. It is preferable to make the length. In addition, as shown in FIG. 2, although the cross section of the convex part 5 is formed in the substantially polygonal shape, you may form in other shapes, such as a substantially circular arc shape.

FIG. 3 is a view showing another embodiment of the check valve according to the present invention . In the embodiment of FIG. 1, one convex portion 5 is formed over the moving range of the valve body 3, but in this embodiment, a convex portion is formed vertically between the pair of guide portions 31 on the drawing. The only difference is that 51 and two convex portions 52 are formed. Thus, if the convex part 51 and the convex part 52 are each provided independently, a fluid can flow freely between the convex part 51 and the convex part 52, and the flow of the fluid is not prevented. In the present embodiment, the case where the protruding amounts of the convex portions 51 and the convex portions 52 are substantially the same is shown, but the protruding amounts may be different. The preferred amount B of protrusions 51 and 52 is 2 to 20% of the inner diameter A of the valve body 1 as in the embodiment of FIG. Any one of the protruding amounts of the convex portion 51 and the convex portion 52 may be 2 to 20% of the inner diameter of the valve body 1. Moreover, although the case where each of the convex part 51 and the convex part 52 is between the same guide parts 31 was shown, each may be formed between different guide parts.

  With the above configuration, the valve element 3 is slidably brought into contact with the inner peripheral surface of the valve chamber 13 with the guide portion 31, and is guided by the inner peripheral surface of the valve chamber 13 in the valve opening / closing direction (vertical direction in FIG. 1). The When a fluid such as a refrigerant flows from the lead-out pipe portion 12, the valve body 3 is seated on the valve seat member 2 by the fluid pressure and the weight of the valve body 3, and the valve port 21 is closed, and the valve is closed. On the other hand, when the flow of the fluid is in the direction of arrow C in FIG. 1 and the fluid flows in from the introduction pipe portion 11, the pressure of the fluid in the valve port 21 becomes higher than the pressure on the opposite side of the valve body 3, that is, the valve chamber 13. . Then, due to the differential pressure between the two pressures, the valve body 3 moves away from the valve seat member 2 and moves in the valve chamber 13, the end of the guide portion 31 of the valve body 3 abuts against the stopper portion 4, and the valve body. 3 moves to a position indicated by a broken line in FIG. At this time, the fluid passes through the outside of the disc portion 32, flows through the passage between the guide portions 31, and flows into the outlet tube portion 12 side. In this case, the check valve 10 is installed immediately after the compressor or immediately after the curved pipe, and even if the fluid flowing in the pipe has a swirling component, the guide portion 31 of the valve body 3 is formed on the convex portion 5. Since it can contact | abut, the valve body 3 cannot rotate. Thereby, the abnormal noise which arose by rotation of the valve body 3 can be suppressed, and it can silence. Further, deformation and wear of the valve body can be prevented, and the check valve 10 life can be maintained.

  In each of the above-described embodiments, the convex portion 5 is provided so as to extend in the moving direction of the valve body 3 as shown in FIG. 1, or a plurality of convex portions 51 and 52 are provided as the valve as shown in FIG. Since the structure is arranged side by side in the movement direction of the body 3, the guide is provided when the valve body 3 is rotated around the axis of the disk portion 32 in both the valve open state and the valve closed state. The rotation is restricted by contacting the portion 31 and the convex portion 5 or the plurality of convex portions 51 and 52. However, it is not limited to such a configuration. Since the valve body 3 is rotated by the fluid flow, the valve body 3 is rotated only when the valve is open. Therefore, the convex part should just be provided so that rotation of a valve body may be controlled at least when a valve is open. As a specific example, in the configuration shown in FIG. 3, there is a configuration in which the convex portion 52 is omitted and only the convex portion 51 is provided. However, in such a configuration, when the valve body 3 moves in the axial direction so as to change from the valve closed state to the valve open state, before the valve body 3 comes into contact with the stopper portion 4 by being caught by the convex portion 51. In order to avoid the movement in the axial direction being restricted, for example, it is preferable that the convex portion 51 has a wedge shape with an acute angle at the end facing the valve seat member 2 side.

  In each of the above-described embodiments, as shown in FIG. 2, the guide portion 31 is slidably guided by the inner peripheral surface of the valve body 1, and the convex portion 5 is provided so as to protrude to the inside of the valve body 1. Therefore, when the valve body 3 is rotated around the axis of the disc portion 32, the guide portion 31 and the convex portion 5 come into contact with each other to restrict the rotation. However, it is not limited to such a configuration. That is, the convex portion is configured such that the convex portion overlaps a circle connecting at least the tips of the plurality of guide portions, so that when the valve body 3 is rotated around the axis of the disc portion 32, the guide The part 31 and the convex part 5 contact | abut, and the said rotation is controlled. As a specific example, in the configuration shown in FIG. 2, the inner peripheral surface of the valve main body 1 is enlarged in diameter, and a plurality of guide portions 31 are provided between the inner peripheral surface of the valve main body 1. It is set as the structure which increased the protrusion amount of the convex part 5 until it overlaps with the circle | round | yen which connects the front-end | tip of the guide part 31, respectively. Even in such a configuration, when the valve body 3 is rotated around the axis of the disk portion 32, the guide portion 31 and the convex portion 5 come into contact with each other, and the rotation is restricted. The same effect is produced.

DESCRIPTION OF SYMBOLS 10 Check valve 1 Valve main body 2 Valve seat member 3 Valve body 4 Stopper part 5, 51, 52 Protrusion part 11 Introducing pipe part 12 Outlet pipe part 13 Valve chamber 21 Valve port 22 Recessed part 31 Guide part 32 Disk part 1a Caulking part

Claims (14)

A valve body having a valve seat member and a stopper portion; a disc portion; and a plurality of guide portions projecting from an outer periphery of the disc portion; and between the valve seat member and the stopper portion. A check valve that is movable and can be closed by its own weight, and forms a fluid passage in the outer periphery of the disc part by a gap between the adjacent guide parts.
A convex portion that protrudes to the inside of the valve body is provided at a portion of the valve body corresponding to a range in which the valve body moves ,
The check valve, wherein the protrusion is a protrusion that can prevent the valve body from rotating, and is disposed between the adjacent guide portions . A cylindrical valve body provided with a valve seat member and a stopper portion; a disc portion; and a plurality of guide portions projecting from an outer periphery of the disc portion, the valve seat member and the stopper portion A check valve that forms a fluid passage in the outer periphery of the disc part by a gap between the adjacent guide parts,
When the plurality of guide portions move between the valve seat member and the stopper portion, the guide portions are slidably guided to the inner peripheral surface of the valve body,
On the inner peripheral surface of the valve body corresponding to the range in which the valve body moves, a convex portion that protrudes to the inside of the valve body is provided ,
The check valve, wherein the protrusion is a protrusion that can prevent the valve body from rotating, and is disposed between the adjacent guide portions . The valve body is formed in a cylindrical shape and provided with a valve seat member and a stopper portion that is spaced apart from the valve seat member in the axial direction, and protrudes from the disc portion and the outer peripheral surface of the disc portion. A plurality of guide portions, and the disc portion overlaps the valve seat member by its own weight and moves in the axial direction of the valve body so that the disc portion is separated from the valve seat member by a fluid flow. A check valve in which a fluid passage is formed between the guide portions adjacent to each other in a valve open state.
A convex portion that protrudes to the inside of the valve body is provided at a portion of the valve body corresponding to a range in which the valve body moves,
When viewed from the axial direction of the valve body, the tip of the convex portion is positioned inside a circle connecting the tips of the plurality of guide portions at least when the valve is open ,
The check valve, wherein the protrusion is a protrusion that can prevent the valve body from rotating, and is disposed between the adjacent guide portions . The check valve according to any one of claims 1 to 3,
A check valve , wherein a plurality of the convex portions are provided side by side in the moving direction of the valve body . The check valve according to any one of claims 1 to 3,
The check valve, wherein the convex portion is set so as to be in contact with the guide portion when the valve body moves between the valve seat member and the stopper portion. The check valve according to any one of claims 1 to 3,
A check valve, wherein the convex portion is, before Kiben provided inside the main body, a protrusion along the direction of movement of the valve body. The check valve according to any one of claims 1 to 3,
The check valve, wherein the convex portion is integrally formed with the valve body by integral molding. The check valve according to any one of claims 1 to 3,
A check valve comprising a plurality of the convex portions. The check valve according to any one of claims 1 to 3,
At least one of an introduction pipe for introducing the fluid into the check valve and a lead-out pipe for guiding the fluid from the check valve is provided in the valve body by integral molding. Check valve. The check valve according to any one of claims 1 to 3,
A check valve characterized in that an inlet pipe for introducing the fluid into the check valve and a lead-out pipe for extracting the fluid from the check valve are both provided in the valve body by integral molding. . The check valve according to any one of claims 1 to 3,
The check valve, wherein the valve seat member is attached by being press-fitted into the valve body. A check valve according to claim 11,
A recess is formed in the outer periphery of the valve seat member, and the valve seat member is caulked to the valve body by pressing a predetermined portion of the valve body corresponding to the recess of the valve seat member from the outside. A check valve characterized by being fixed. The check valve according to any one of claims 1 to 3,
A check valve, wherein a length of the convex portion in a direction in which the valve body moves is set so as to contact the valve body over a moving range of the valve body. A check valve according to any one of claims 1 to 13,
A check valve characterized in that the length from the inner peripheral surface of the valve body to the apex of the convex part is in the range of 2 to 20% of the inner diameter of the valve body.

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