JP2007092918A - Back pressure-regulating valve - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a back pressure-regulating valve structured so that a valve element secured to a diaphragm is energized by a spring, capable of causing the valve element and the valve seat to abut to each other uniformly irrespective of the parallelism of the two end faces of the spring. <P>SOLUTION: The back pressure-regulating valve is equipped with the valve body 5 having an influx passage 7 and an exhaust passage 8 and furnished with a recess 7c in communication with the influx passage 7, the diaphragm 10 mounted in the recess 7c, the valve element 11 fixed to the diaphragm 10, the valve seat 6 formed in the valve body 11, and an energizing member 35 to energize the valve element 11 toward the valve seat 6, in which the area between the influx passage 7 and the exhaust passage 8 is closed while the valve element 11 abuts to the valve seat 6, and is opened when the valve element 11 separates from the valve seat 6, wherein the valve element 11 is in point contact with a transmitting member 33 supporting the movable side end 35b of the energizing member 35 and transmitting the energizing force to the valve element 11. <P>COPYRIGHT: (C)2007,JPO&INPIT

Description

The present invention has a valve body biased by a biasing member such as a spring, and the valve body opens and closes a valve seat provided at a connection portion between the inflow path and the discharge path, thereby discharging the fluid on the inflow path side. The present invention relates to a back pressure valve that circulates to the side and makes the pressure on the inflow passage side a predetermined pressure.

Conventionally, a back pressure valve has a valve body 105 having an inflow passage 107 and a discharge passage 108, a diaphragm 110 attached to the valve body 105, and a valve fixed to the diaphragm 110, for example, as indicated by reference numeral 101 in FIG. A body 111, a valve seat 106 formed at a connection portion between the inflow passage 107 and the discharge passage 108, and a biasing member 130 including a spring 135 and the like, and the seal portion 113 of the valve body 111 is biased. The member 130 is urged toward the valve seat 106 side, and the seal portion 113 of the valve body 111 abuts against the valve seat 106 to close the space between the inflow passage 107 and the discharge passage 108, thereby allowing fluid from the inflow passage 107 side to flow. A chamber (recessed portion) 107c formed in the valve body 105 by blocking the flow and maintaining the fluid pressure on the inflow passage 107 side and increasing the pressure on the inflow passage 107 side. The fluid on the chamber 110 presses the chamber-side surface of the diaphragm 110 to deform the biasing member 130, and the valve body 111 fixed to the diaphragm 110 moves in a direction away from the valve seat 106, thereby sealing the valve body 111. The part 113 and the seal part 106a of the valve seat 106 are opened, and the fluid flows from the inflow path 107 side to the discharge path 108 side.
When the fluid pressure on the inflow path 107 decreases to a predetermined pressure as the fluid flows from the inflow path side 107 to the discharge path side 108, the deformation due to the fluid pressure generated in the diaphragm 110 is pushed back by the biasing force of the biasing member 130. At the same time, the seal portion of the valve body 111 is in contact with the seal portion 106a of the valve seat 106 and is closed, so that the fluid pressure on the inflow passage 107 side is maintained.

  For example, when the biasing member 130 is a spring 135, the fixed-side end surface 135a of the spring 135 is supported by the fixed-end side tray 132, and the moving-side end surface 135b is supported by the moving-end side tray 133. Depending on the processing accuracy at the time of manufacturing 135, the parallelism of the both end surfaces 135a and 135b is not necessarily sufficient, and when the parallelism is low, storage and operation stop in a state where there is no inflow fluid pressure or is considerably low Sometimes, the moving-end side tray 133 that supports the moving-side end surface 135b of the spring 135 is not perpendicular to the expansion / contraction direction of the spring 135, and as shown in FIG. The valve seat 106 is in contact with the seal portion 106a at an angle.

As a result, the contact between the seal portion 113 of the valve body 111 and the seal portion 116a of the valve seat 116 becomes non-uniform, and the biting deformation depth generated in the seal portion 113 of the valve body 111 becomes non-uniform, and FIG. When the back pressure valve is used as shown in FIG. 4, when the fluid starts to be discharged, the fluid blows below the discharge pressure set from the portion where the biting deformation depth is large, or the valve body 111 is separated from the valve seat 106. As shown in FIG. 4C, there is a problem that the amount of fluid passing is uneven depending on the opening degree of the seal portion 113 and the seal portion 106a, and it is difficult to accurately discharge the fluid pressure on the inflow passage 107 side.
On the other hand, in order for the expansion / contraction direction of the urging member to move the valve body straight with respect to the valve seat, the urging member is mounted on the guide housing, and the outer peripheral surface of the housing is formed on the inner periphery of the cap. There has been disclosed a back pressure valve that is configured to be inserted into a guide hole and reliably advanced and retracted (see, for example, Patent Document 1).
JP 2003-042991 A

  However, it is not easy to manufacture the parallelism of both end faces of the spring with high accuracy, and the manufacturing cost is increased, and a guide housing in which a biasing member is mounted like the back pressure valve described in Patent Document 1 Adopting a structure in which guide holes are formed on the inner periphery of the cap leads to a significant increase in processing cost, and the force due to the inclination of the end face of the urging member is received by the guide surface. And there is a risk of malfunction due to uneven wear of the guide surface. Therefore, there has been a demand for a technique that enables the valve body to uniformly contact the valve seat regardless of the parallelism of both end faces of the urging member.

  The present invention has been made in consideration of such circumstances, and in a back pressure valve in which a biasing member such as a spring biases a valve body fixed to a diaphragm, the present invention relates to the parallelism of both end faces of the biasing member. It is another object of the present invention to provide a back pressure valve in which the valve body and the valve seat are in uniform contact.

In order to solve the above problems, the present invention proposes the following means.
The invention according to claim 1 has an inflow path and a discharge path, a valve body formed with a recess communicating with the inflow path, a diaphragm attached to an opening of the recess, and fixed to the diaphragm A valve body; a valve seat provided in the valve main body and formed at a connection portion between the inflow path and the discharge path; and a biasing member that biases the valve body toward the valve seat. A back pressure valve that closes between the inflow path and the discharge path when a body abuts on the valve seat, and opens between the inflow path and the discharge path when the valve body is separated from the valve seat. The valve body and the transmission member that supports the moving side end of the urging member and transmits the urging force to the valve body are in point contact.

  According to the back pressure valve of the present invention, the transmission member that supports the urging member that urges the valve body toward the valve seat on the moving side end surface is in point contact with the valve body fixed to the diaphragm. For this reason, the parallelism between the moving side end surface and the fixed side end surface of the biasing member is not sufficient, and the moving side end surface of the biasing member is not perpendicular to the moving direction of the valve body. Also, the valve body moves in the direction in which the moving side end of the urging member advances and retreats. As a result, the seal part of the valve body and the valve seat come into uniform contact with each other, and the depth of biting deformation generated in the seal part of the valve body becomes uniform, and the contact uniformity between the valve body seal part and the valve seat is maintained. A stable flow of fluid can be maintained during opening and closing of the body.

  The invention according to claim 2 is the back pressure valve according to claim 1, wherein the biasing member is a spring, and the transmission member is a moving end side tray that supports the moving side end of the spring. And a pair of uneven | corrugated | grooved parts are formed between this movement end side saucer and the said valve body, These are point-contacting, It is characterized by the above-mentioned.

  According to the back pressure valve of the present invention, a pair of concavo-convex portions are formed between the valve body and the moving end side tray that supports the end surface of the moving side end portion of the spring that biases the valve body toward the valve seat. Since these are in point contact, even if the parallelism between the moving side end surface and the fixed side end surface of the spring is not sufficient, the valve body moves in the direction in which the moving side end portion of the urging member advances and retreats. As a result, the seal portion of the valve body and the valve seat are in uniform contact with each other, and a stable fluid flow can be maintained when the valve body is opened and closed.

  According to the back pressure valve of the present invention, for example, even when the parallelism of the both end surfaces of the biasing member such as a spring is not sufficient, the valve body and the valve seat abut against each other regardless of the parallelism. It is possible to ensure a stable flow of fluid when opening and closing.

FIG. 1 is a view showing a back pressure valve according to an embodiment of the present invention, and reference numeral 1 denotes a back pressure valve.
The back pressure valve 1 includes a valve body 5, a valve seat 6, a diaphragm 10, a valve body 11, a cap 20, a biasing member 30, and a moving end side tray (transmission) that supports the moving end of the biasing member. Member) 33, and the valve body 11 is urged toward the valve seat 6 by the urging member 30, and the seal portion 13 of the valve body 11 contacts the valve seat 6, thereby forming the valve body 5. The inflow path 7 and the discharge path 8 are closed, and the seal portion 13 of the valve body 11 is separated from the valve seat 6 so that the space between the inflow path 7 and the discharge path 8 is opened.
In this embodiment, the biasing member 30 is a spring 35.

  The valve body 5 has a cylindrical shape, and includes an inflow path 7 through which a fluid flows in and a discharge path 8 through which the fluid is discharged. At one end of the cylindrical shape, a first recess (recess) 5a and The second recess 5b is formed on the bottom surface of the first recess 5a and has a smaller diameter than the first recess.

The inflow path 7 is composed of an inflow port 7a formed on the outer peripheral portion of the valve body 5, an inflow side connection hole 7b, and a chamber 7c formed of a first recess 5a (recess). It communicates with the chamber 7c through the side connection hole 7b.
The discharge path 8 is composed of a discharge port 8a, a first discharge hole 8b, a second discharge hole 8c composed of the second recess 5b, and a third discharge hole 8d. The first discharge hole 8b and the second recess 5b communicate with the third discharge hole 8d.
For example, an engaging portion such as a screw is formed in the inflow port 7a and the discharge port 8a, and can be connected to an external pipe or the like.

The valve seat 6 includes a seal portion 6a, a through hole 6b, and an outer peripheral surface 6c, and the through hole 6b constitutes a third discharge hole 8c.
The outer peripheral surface 6 c of the valve seat 6 is fitted and inserted into close contact with the inner peripheral surface 5 c of the second recess 5 b formed in the valve body 5, and the seal portion 6 a is a connection portion between the inflow passage 7 and the discharge passage 8. The fluid is prevented from flowing from the chamber 7c to the second discharge hole 8c between the inner peripheral surface 5c and the outer peripheral surface 6b of the valve seat 6.

The diaphragm 10 is an elastic flat plate-like metal plate that is movable in a direction perpendicular to the flat plate-like surface, has a hole into which the valve body 11 is inserted and formed at the center portion, and an outer peripheral edge portion. Is sandwiched between the valve body 5 and the cap 20, thereby sealing the opening of the chamber 7 c of the valve body 5.
As a result, when the fluid IN on the inflow path 7 side flows into the chamber 7c, the diaphragm 10 is deformed from the chamber 7c to the spring 35 side by the pressure of the fluid IN, and the valve body 11 is moved to the spring 35 side. It is like that.

  The valve body 11 includes a support convex portion 11 a having a paraboloid shape or a spherical shape at a tip located on the spring side of the valve body 11, and a seal portion 13, and is formed at the center of the diaphragm 10. The support convex portion 11a is fixed to the hole and is in point contact with the support concave portion 33a formed on the moving end side tray 33 so as to be swingable. In this specification, the point contact is not limited to a point having no geometrically defined area, and the convex part and the concave part oscillate based on the relative size and arrangement of the convex part and the concave part. It refers to the concept of touching as possible.

  The fixing member 14 is a member for vertically fixing the valve body 11 with respect to the plate surface of the diaphragm 10, and includes a first wall portion 14 a that is in contact with the surface of the diaphragm 10 on the spring 35 side, It is formed at the center of the wall portion 14a, and has a hole 14b that holds the valve body 11 perpendicular to the diaphragm 10. When the valve body 11 is inserted into the hole 14b, it is not deformed. The valve element 11 is displaceable perpendicularly to the plate surface of the diaphragm 10.

The cap 20 includes a concave portion 21 that houses the spring 35. The concave portion 21 includes a small diameter portion 21a and a large diameter portion 21b in the vicinity of the opening, and a step portion between the large diameter portion 21b and the small diameter portion 21a. Is formed with an end face 21c perpendicular to the axis of the cap.
A female screw is formed concentrically with the axis of the cap at the center of the top surface of the cap 20, and a spring adjusting member 40 is screwed into the female screw, and the spring adjusting member 40 is rotated to bias the spring 35. The fluid pressure at which the back pressure valve 1 operates can be adjusted by the fluid IN on the inflow path 7 side.

The fixed end tray 32 has a substantially multi-stage cylindrical shape having a small-diameter convex portion and a conical concave portion 32a. The small-diameter convex portion is provided with the inner periphery of the fixed end of the spring 35, and the concave portion 32a is provided as a spring adjusting member. Forty convex portions 40a are supported.
The conical concave portion 32a and the convex portion 40a of the spring adjusting member 40 are in point contact with each other, and can be swung with respect to each other.

The moving end side tray 33 has a substantially multi-stage cylindrical shape, the inner periphery of the moving end of the spring 35 is disposed on the small-diameter convex portion 33 b, and the valve body 11 side surface of the moving end side tray 33 has A concave portion 33 a that can be brought into point contact with the support convex portion 11 a is formed, and the moving end side of the spring 35 is supported by the valve body 11 so as to be swingable.
As a result, the expansion / contraction direction of the spring 35 coincides with the movement direction of the valve body 11 regardless of the parallelism of the fixed side end surface 35a and the movement side end surface 35b of the spring 35.

The spring 35 includes a fixed-side end surface 35 a and a moving-side end surface 35 b. The fixed-side end surface 35 a is accommodated in the recess 21 as the top surface side of the cap 20. While being supported, the moving side end face 35 b is supported by the supporting concave portion 33 a of the moving end tray 33 by the supporting convex portion 11 a of the valve body 11.
Further, the spring 35 urges the valve body 11 toward the valve seat 6 by being in a compressed state, and the pressure of the fluid IN in the chamber 7c rises, and the spring given to the diaphragm 10 from the chamber 7c. It is comprised so that it may compress by the force to 35 side.

Next, the operation of the back pressure valve 1 configured as described above will be described.
First, when the pressure of the fluid IN on the inflow path 7 side is equal to or lower than a predetermined value, the force applied to the diaphragm 10 by the fluid IN in the chamber 7 c is set to be equal to or less than the biasing force of the spring 35. Is urged toward the valve seat 6, and the seal portion 13 of the valve body 11 is brought into close contact with the seal portion 6 a of the valve seat 6, so that the space between the inflow passage 7 and the discharge passage 8 is closed.

  Next, when the pressure of the fluid IN on the inflow path 7 side rises to a predetermined value or more, the force applied to the diaphragm 10 by the fluid IN in the chamber 7 c becomes larger than the urging force of the spring 35 and is given to the diaphragm 10. The spring 35 is compressed by the force and the diaphragm 10 is deformed to the spring 35 side. Accordingly, the seal portion 13 of the valve body 11 is separated from the seal portion 6a of the valve seat 6, and the space between the inflow passage 7 and the discharge passage 8 is opened. As a result, the fluid IN flows from the inflow path 7 side to the discharge path 8 side, and the pressure of the fluid IN that has risen on the inflow path 7 side decreases.

  When the fluid IN on the inflow path 7 flows from the inflow path 7 to the discharge path 8, the pressure of the fluid IN on the inflow path 7 decreases, and when the pressure of the fluid IN on the inflow path 7 decreases to a predetermined pressure, the diaphragm The force that presses 10 toward the spring 35 is reduced, and the deformation that has occurred in the diaphragm 10 is pushed back to the biasing force of the spring 35. Accordingly, the seal portion 13 of the valve body 11 is in close contact with the seal portion 6a of the valve seat 6 so that the space between the inflow passage 7 and the discharge passage 8 is closed, and the pressure of the fluid IN on the inflow passage 7 side is maintained. It has become.

  As a result, as shown in FIG. 2 (A), the seal portion 13 of the valve body 11 and the seal portion 6a of the valve seat 6 are in close contact with each other, and as shown in FIGS. 2 (B) and 2 (C). In addition, regardless of the degree of opening and closing of the valve body 11 and the valve seat 6, the separation distance between the seal portion 13 of the valve body 11 and the seal portion 6 a of the valve seat 6 is uniform, and stable fluid flow and accurate back pressure valve 1 are achieved. Operation is ensured.

  According to the back pressure valve 1 of the first embodiment, the moving end side tray 33 supporting the moving side end surface 35b of the spring 35 and the convex portion 11a of the valve body 11 are in point contact with the concave portion 33a of the spring tray 33. Therefore, the urging force of the spring 35 is transmitted in the advancing / retreating direction of the valve body 11 regardless of the parallelism of the fixed side end surface 35a and the moving side end surface 35b of the spring 35, and the seal portion of the valve body 11 13 sealing surfaces are maintained perpendicular to the direction in which the moving side end of the spring 35 advances and retreats.

As a result, the contact between the seal portion 13 of the valve body 11 and the seal portion 6a of the valve seat 6 is maintained regardless of the parallelism between the fixed side end surface 35a and the moving side end surface 35b of the spring 35, A stable flow of fluid can be maintained when the valve body 11 is opened and closed.
Therefore, when the valve body 11 is separated from the valve seat 6, the uneven seal of the seal portion between the valve body 11 and the valve seat 6 is suppressed, and the fluid IN is blown out below the discharge pressure set to the discharge path 8 side. In addition, it is possible to maintain a stable flow of the fluid IN to the discharge path 8 when the valve body 11 is opened and closed.
Moreover, since the seal part 13 of the valve body 11 contacts the valve seat 6 uniformly, the biting deformation depth of the seal part 13 becomes uniform, and the life of the seal part 13 is suppressed by suppressing deformation and wear bias. Can be extended.

In addition, this invention is not limited to the said embodiment, A various change is possible in the range which does not deviate from the meaning of invention.
In the said embodiment, although the recessed part 33a was formed in the surface at the side of the valve body 11 of the moving end side saucer 33 and the support convex part 11a was formed in the front-end | tip of the valve body 11, the moving end side saucer was demonstrated. It is good also as a structure by which a convex part is formed in 33 and a recessed part is formed in the valve body 11. FIG.
Moreover, although the case where the support convex part 11a of the valve body 11 consists of a paraboloid shape or a part of spherical shape was demonstrated, you may use a cone shape and other shapes which can rock | fluctuate.

  In addition, the fluids that can be used in the back pressure valve 1 include inert gases such as nitrogen and argon, flammable gases such as hydrogen, methane, and ethylene, flammable gases such as oxygen, and corrosive gases such as chlorine and sulfur dioxide. In addition to gases including the above, various fluids such as liquids containing water, acid or alkali can be targeted.

  In the above embodiment, the case where the urging member 30 is configured by the spring 35 has been described. However, the urging member 30 is formed of another coil spring such as a conical shape, a bamboo shoot spring, a disc spring, or a resin. As long as it has end faces on both sides in the expansion and contraction direction such as an elastic body, it can be applied to various configurations.

  The diaphragm 10 has been described with respect to a case where the diaphragm 10 is made of a metal disk. However, in addition to metals such as stainless steel, other materials having elasticity such as a rubber film or a synthetic resin film may be used. Further, the shape is not limited to a disk-shaped flat plate, and a part of a three-dimensional shape such as a case where an annular rib is formed around the valve body 11 or a spherical surface is used. The diaphragm 10 may be configured by using it.

1 is an overall cross-sectional view showing an embodiment of the present invention. It is a figure which shows operation | movement of the valve body in one embodiment of this invention. It is a whole sectional view showing the conventional back pressure valve. It is a figure which shows operation | movement of the valve body of the conventional back pressure valve.

Explanation of symbols

DESCRIPTION OF SYMBOLS 1 Back pressure valve 6 Valve seat 7 Inflow path 8 Discharge path 10 Diaphragm 11 Valve body 11a Support convex part (convex part)
13 Sealing part 30 Energizing member 33 Moving end side tray (transmission member)
33a Concave portion 35 Spring (biasing member)

Claims (2)

A valve body having an inflow path and a discharge path, and having a recess formed in communication with the inflow path, a diaphragm attached to an opening of the recess, a valve body fixed to the diaphragm, and the valve body A valve seat formed at a connection portion between the inflow passage and the discharge passage, and a biasing member that biases the valve body toward the valve seat, and the valve body abuts on the valve seat. The back pressure valve is closed between the inflow path and the discharge path, and the valve body is separated from the valve seat to open the space between the inflow path and the discharge path,
A back pressure valve characterized in that the valve body and a transmission member that supports the moving side end of the urging member and transmits the urging force to the valve body are in point contact. The back pressure valve according to claim 1,
The biasing member is a spring, and the transmission member is a moving end side tray that supports the moving side end of the spring, and a pair of concavo-convex portions between the moving end side tray and the valve body. A back pressure valve characterized in that a portion is formed and these are in point contact.

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