JP2019219044A - Diaphragm valve - Google Patents

Abstract

To provide a diaphragm valve that can improve long-term performance.SOLUTION: In a diaphragm valve 10, a diaphragm bolt 65 connects a diaphragm 12 and a driving mechanism 14. The diaphragm bolt 65 comprises a shaft part 71 and an insertion part 72. The shaft part 71 is arranged along a driving direction Z of the diaphragm 12. The insertion part 72 is provided at a tip of the shaft part 71 on the side of a contact part 33a, and inserted into the diaphragm 12. The insertion part 72 comprises an opening direction side surface 93a on the side opposite to a valve body 11, and a closing direction side surface 94a on the side of the valve body 11. The opening direction side surface 93a is formed so as to be provided with no edge.SELECTED DRAWING: Figure 10

Description

  The present invention relates to a diaphragm valve.

  2. Description of the Related Art A diaphragm valve is provided in a piping line of a plant for water treatment, chemicals, food, and the like, and a fluid flowing through the piping is controlled by the diaphragm valve.

  In a diaphragm valve, piping is connected to both ends and installed in a plant. The diaphragm valve is in a state where the flow path is closed when the diaphragm is pressed against the curved surface portion of the partition wall, and is in a state where the flow path is opened when the diaphragm is separated from the partition wall (for example, see Patent Document 1). 1 (see FIGS. 1 and 2).

  In the diaphragm valve disclosed in Patent Document 1, the diaphragm is held by a compressor using a diaphragm bolt.

JP 2001-214981 A

  However, in the diaphragm valve disclosed in Patent Literature 1, when the diaphragm is moved in the opening direction, stress concentrates on a portion where the diaphragm bolt is embedded in the diaphragm and a contact portion between the diaphragm and the diaphragm valve. In some cases, cracks or bolts were removed.

  An object of the present invention is to provide a diaphragm valve capable of improving long-term performance in consideration of the above-described conventional problems.

  In order to achieve the above object, a diaphragm valve according to a first aspect includes a valve body, a valve unit, a drive mechanism, and a connection unit. The valve body has a flow path, an opening, and a contact part. The flow path is formed inside. The opening is formed in the middle of the flow path. The contact portion is provided at a position corresponding to the opening of the flow path. The valve portion is disposed so as to close the opening, and can close the flow path by contacting the contact portion. The drive mechanism opens and closes the flow path by driving the valve unit. The connection unit connects the valve unit and the drive mechanism. The connecting portion has a shaft portion and an insertion portion. The shaft portion is arranged along the driving direction of the valve portion. The insertion part is provided at the tip of the shaft part on the contact part side, and is inserted into the valve part. The insertion portion is provided on the opposite side of the valve body and has a first surface on which no corner is formed, and a second surface provided on the valve body side.

As described above, since the first surface formed in the opening direction of the insertion portion inserted into the valve body has no corner, when the valve body is moved in the opening direction, there is a gap between the first surface and the valve body. Can be reduced.
Thereby, the long-term performance of the diaphragm valve can be improved.

  A diaphragm valve according to a second invention is the diaphragm valve according to the first invention, wherein the outermost of the first surface and the second surface is a boundary between the first surface and the second surface.

  Thereby, no corner is formed on the opening direction side of the insertion portion, and the stress when the valve body is moved in the opening direction can be reduced.

  A diaphragm valve according to a third aspect of the present invention is the diaphragm valve according to the first aspect of the present invention, wherein the side surface passes through at least a predetermined portion of a boundary between the first surface and the second surface in a side view. The angle θ1 formed by the first straight line having the slope and the second straight line passing through the predetermined portion of the boundary and perpendicular to the direction along the axis is defined by the predetermined portion of the boundary, the first surface, and the axis. Assuming that an angle formed by the third straight line connecting the connecting portion and the second straight line is θc, the following formula (1) is satisfied.

  Thereby, since the first surface is formed on at least one of the inclined surface and the curved surface which bulges outward, the stress can be reduced.

  A diaphragm valve according to a fourth aspect of the present invention is the diaphragm valve according to the third aspect of the present invention, in which the outer periphery of the insertion portion has irregularities. The predetermined part of the boundary is the tip of the convex part.

  Thereby, the stress generated at the tip of the convex portion when the valve body is moved in the opening direction can be reduced.

  A diaphragm valve according to a fifth invention is the diaphragm valve according to the third invention, wherein the outer periphery of the insertion portion is circular. The boundary is the outer circumference of the insertion section. Equation (1) is satisfied over the entire circumference of the boundary.

  Thereby, the stress which occurs in the entire circumference of the insertion portion when the valve body is moved in the opening direction can be reduced.

  A diaphragm valve according to a sixth aspect of the present invention is the diaphragm valve according to any one of the first to fifth aspects, wherein in a side view, the diaphragm valve passes through a connection portion between the first surface and the shaft portion and extends in a direction along the shaft portion. An angle θ2 formed by a fourth straight line perpendicular to the fifth straight line passing through the connecting portion and having a slope of the first surface at the connecting portion is equal to or greater than 0 °.

  Thus, the first surface does not protrude more toward the shaft portion than the connection portion, so that the stress can be reduced.

  According to the present invention, it is possible to provide a diaphragm valve capable of improving long-term performance.

1 is a perspective view of a diaphragm valve using a flow channel structure according to an embodiment of the present invention. FIG. 2 is a partial cross-sectional view of the diaphragm valve of FIG. The perspective view which looked at the valve main body of FIG. 1 from the upper part. Sectional drawing of the valve main body of FIG. (A) The bottom view of the diaphragm of FIG. 1, (b) The arrow sectional drawing between CC 'of FIG.10 (a). The bottom view of the compressor of FIG. The perspective view of the diaphragm bolt of FIG. FIG. 8 is a cross-sectional view taken along the line DD ′ in FIG. 7. FIG. 9 is a sectional view taken along arrow EE ′ in FIG. 8. FIG. 3 is an enlarged view near the diaphragm bolt of FIG. 2. (A) A schematic sectional view showing a state in which a flow path is closed, and (b) a schematic sectional view showing a state in which a flow path is opened. FIG. 3 is a cross-sectional view illustrating an insertion portion of the diaphragm bolt according to the first embodiment. Sectional drawing which shows the insertion part of the diaphragm bolt in Example 2. FIG. FIG. 13 is a cross-sectional view illustrating an insertion portion of the diaphragm bolt according to the third embodiment. Sectional drawing which shows the insertion part of the diaphragm bolt in the comparative example 1. FIG. Sectional drawing which shows the insertion part of the diaphragm bolt in the comparative example 2. FIG. FIG. 13 is a cross-sectional view illustrating an insertion portion of a diaphragm bolt in Comparative Example 3. Sectional drawing which shows the insertion part of the diaphragm bolt in the comparative example 4. The figure which shows the table of the result of stress of Examples 1-3 and Comparative Examples 1-4. (A) A perspective view showing a modified example of the diaphragm bolt according to the embodiment of the present invention, (b) a cross-sectional view taken along the line HH ′ in FIG. 20 (a), and (c) JJ ′ in FIG. 20 (a). FIG.

  Hereinafter, a diaphragm valve 10 according to an embodiment using a valve flange according to the present invention will be described.

<1. Structure>
(1-1. Outline of diaphragm valve)
FIG. 1 is an external perspective view of a diaphragm valve 10 according to an embodiment of the present invention. FIG. 2 is a partial cross-sectional configuration diagram of the diaphragm valve 10 of the present embodiment.

  As shown in FIGS. 1 and 2, the diaphragm valve 10 of the present embodiment includes a valve body 11, a diaphragm 12 (also referred to as a diaphragm), a bonnet 13, and a drive mechanism 14. Pipes are connected to both ends of the valve body 11, and a flow path 24 through which a fluid flows is formed in the valve body 11. The diaphragm 12 opens or shuts off the flow path 24. The bonnet 13 is attached to the valve body 11 so as to cover the diaphragm 12. A part of the drive mechanism 14 is disposed in the hood 13 and drives the diaphragm 12.

(1-2. Valve body 11)
FIG. 3 is a perspective view showing the valve body 11. FIG. 4 is a cross-sectional view of the diaphragm valve 10.

  The valve body 11 is made of PVC (polyvinyl chloride), HT (heat-resistant vinyl chloride pipe), PP (polypropylene), or PVCF (polyvinylidene fluoride), polystyrene, ABS resin, polytetrafluoroethylene, perfluoroalkyl vinyl ether copolymer. , A resin such as polychlorotrifluoroethylene, a metal such as iron, copper, copper alloy, brass, aluminum, and stainless steel, or a porcelain.

  As shown in FIG. 3, the valve body 11 has a first end 21, a second end 22, a center 23, and a flow path 24.

  The first end 21, the second end 22, and the center 23 are formed integrally, and the flow path 24 includes a first end 21, a center 23, and a second end 23, as shown in FIG. 4. The portion 22 is formed.

(1-2-1. First End 21, Second End 22)
As shown in FIGS. 3 and 4, the first end 21 and the second end 22 are arranged so as to sandwich the center 23 and are connected to the center 23.

  As shown in FIG. 3, the first end portion 21 has a first flange portion 211 to which a pipe is connected, and a first connection portion 212 connecting the first flange portion 211 and the central portion 23. As shown in FIG. 4, the first flange portion 211 has a flange surface 213 formed with an inlet 24a through which a fluid flows into the valve body 11, and can be connected to a pipe.

  Further, as shown in FIG. 4, the second end portion 22 has a second flange portion 221 to which a pipe is connected, and a second connection portion 222 connecting the second flange portion 221 and the central portion 23. As shown in FIG. 3, the second flange portion 221 has a flange surface 223 on which an outlet 24b from which fluid is discharged from the valve body 11 is formed, and can be connected to a pipe.

  The first flange portion 211 and the second flange portion 221 are arranged so as to face each other as shown in FIGS. 3 and 4, and the flange surfaces 213 and 223 are formed so as to face each other and become parallel. ing. The position of the inlet 24a and the position of the outlet 24b are also opposed.

(1-2-2. Central part 23)
The center part 23 is provided between the first end part 21 and the second end part 22, as shown in FIG. The central portion 23 has a first surface 31 in which an opening 31a is formed in the center. As shown in FIG. 3, the first surface 31 is substantially planar, and is formed perpendicular to the flange surfaces 213 and 223. An opening 31a is formed at the center of the first surface 31. The periphery of the opening 31a is curved. A direction along a line connecting the inlet 24a and the outlet 24b is defined as a first direction X (also referred to as a fluid flow direction X), and a direction perpendicular to the first direction X and parallel to the first surface 31 is defined as a second direction. The direction Y (also referred to as the width direction Y). The first direction X can also be said to be a direction along a straight line perpendicular to the flange surfaces 213 and 223. Further, the movement direction of a stem 63, compressor 61 or diaphragm 12 described later is indicated by an arrow Z (a direction perpendicular to the first direction X and the second direction Y).

  On the first surface 31 at the periphery of the opening 31a, a projection 35 is formed along the outer periphery of the diaphragm 12. The convex portion 35 is formed on the circumference, and a positioning portion 352 formed in a rectangular shape in a plan view is provided at one position on the circumference. A protrusion 123 of the diaphragm 12 described later fits into the positioning portion 352, thereby positioning the diaphragm 12 in the circumferential direction.

(1-2-3. Channel 24)
As shown in FIG. 4, the flow path 24 is formed from the inlet 24a to the outlet 24b. The wall 33 is formed at the center of the flow path 24 so as to protrude toward the first surface 31. The wall portion 33 is formed such that the inner surface of the flow channel 24 gently rises toward the first surface 31 so as to form an inclination in the flow channel 24. The above-described opening 31 a is formed at a position corresponding to the wall 33.

  The diaphragm 12, which will be described later, is pressed against the contact portion 33 a, which is the tip of the wall 33 on the first surface 31 side.

  The flow path 24 has an inlet-side flow path 241 formed from the inlet 24a of the first end 21 to the contact part 33a and an outlet side formed from the outlet 24b of the second end 22 to the contact part 33a. It has a flow path 242 and a communication portion 243 (see FIG. 2) that connects the inlet flow path 241 and the outlet flow path 242.

  The inlet-side flow path 241 is formed such that the inner peripheral surface thereof is curved, and the width in the direction perpendicular to the first surface 31 (the width in the third direction Z) is formed on the wall 33 as shown in FIG. It becomes narrower as you go. On the other hand, the width of the inlet-side flow path 241 in the direction parallel to the first surface 31 (the width in the second direction Y) increases toward the wall 33.

  The outlet side flow path 242 is formed from the outlet 24b of the second flange portion 221 to the contact portion 33a. The outlet side flow path 242 has an inner peripheral surface formed to be curved, and the width in the direction perpendicular to the first surface 31 (the width in the third direction Z) is formed on the wall 33 as shown in FIG. It becomes narrower as you go. On the other hand, the width of the outlet-side flow path 242 in the direction parallel to the first surface 31 (the width in the second direction Y) increases toward the wall 33.

  As shown in FIG. 2, the communication portion 243 is a portion of the flow channel 24 on the first surface 31 side of the wall portion 33 and communicates the inlet flow channel 241 and the outlet flow channel 242.

(1-3. Diaphragm 12)
The material of the diaphragm 12 may be a rubber-like elastic body, and is not particularly limited. For example, ethylene propylene rubber, isoprene rubber, chloroprene rubber, chlorosulfonated rubber, nitrile rubber, styrene butadiene rubber, chlorinated polyethylene, fluoro rubber, EPDM (ethylene propylene diene rubber), PTFE (polytetrafluoroethylene) and the like are preferable. Material. Further, a high-strength reinforcing cloth may be inserted into the diaphragm 12. The reinforcing cloth is desirably made of nylon. This is preferable because deformation and breakage of the diaphragm 12 can be prevented when fluid pressure is applied to the diaphragm 12 when the diaphragm valve is closed.

  The diaphragm 12 of the present embodiment is formed by laminating two members. Examples of the two members include an elastic elastomer and a fluorine compound.

  As shown in FIG. 2, the diaphragm 12 is disposed on the first surface 31 so as to close the opening 31a.

  FIG. 4 shows the central axis O of the diaphragm 12, the compressor 61, the sleeve 62, and the stem 63. The center axis O is perpendicular to the first surface 31 and coincides with the driving direction of the diaphragm 12, a compressor 61 and a stem 63 described later.

  FIG. 5A is a bottom view of the diaphragm 12 as viewed from the flow path 24 side. FIG. 5B is a cross-sectional view taken along the line FF ′ in FIG.

  As shown in the figure, the diaphragm 12 has a diaphragm 120, an outer peripheral edge 121, and a protrusion 125. The diaphragm 120 is moved up and down by the driving mechanism 14. The diaphragm 120 has a circular shape and a size corresponding to the opening 31 a of the valve body 11. On the surface 120a on the contact portion 33a side of the diaphragm portion 120, a protruding ridge portion 122 formed so as to project toward the contact portion 33a of the valve body 11 is formed. The ridge 122 is formed along the second direction Y, and is along the contact portion 33a. As shown in FIG. 4, a convex portion 124 protruding toward the bonnet 13 is formed at the center of the surface 120 b of the diaphragm 120 opposite to the surface 120 a.

  The outer peripheral edge 121 is formed on the outer periphery of the diaphragm 120, and is sandwiched between a bonnet 13 and the valve body 11, which will be described later, as shown in FIGS.

  The protruding portion 125 is formed to protrude outward from the outer peripheral edge 121. The protruding portion 125 is formed for positioning the diaphragm 12 in the circumferential direction. The protruding portion 125 fits into the above-described positioning portion 352, and positioning of the diaphragm 12 in the circumferential direction is performed.

  The diaphragm 12 is moved downward by the drive mechanism 14 described below, and contacts the contact portion 33a of the wall portion 33 to close the communication portion 243 and close the flow path 24. Further, the diaphragm 12 is moved upward by the drive mechanism 14, and the flow path 24 is opened by separating the diaphragm 12 from the contact portion 33a.

(1-4. Bonnet 13)
The bonnet 13 is made of PVC (polyvinyl chloride), HT (heat-resistant vinyl chloride pipe), PP (polypropylene), or PVCF (polyvinylidene fluoride), polystyrene, ABS resin, polytetrafluoroethylene, It can be formed of a resin such as a fluoroalkyl vinyl ether copolymer or polychlorotrifluoroethylene, or a metal such as iron, copper, a copper alloy, brass, aluminum, or stainless steel, or porcelain.

  The bonnet 13 is fixed to the first surface 31 of the valve body 11 with bolts 100 and the like, as shown in FIG. The bonnet 13 is provided so as to cover the opening 31a via the diaphragm 12. That is, the bonnet 13 has an opening 13a corresponding to the first surface 31, and has a through hole 13b in which a sleeve 62 and a stem 63 described later are arranged at a position facing the opening 13a.

(1-5. Drive mechanism 14)
The drive mechanism 14 includes a compressor 61, a sleeve 62, a stem 63, a handle 64, and a diaphragm bolt 65, as shown in FIG.

(1-5-1. Compressor 61)
The compressor 61 is formed of PVDF (polyvinylidene fluoride) or the like, and is connected to the diaphragm 12. A diaphragm bolt 65 (to be described in detail later) is embedded in the diaphragm 12, and the diaphragm bolt 65 protrudes on the opposite side (non-liquid contact side) of the valve body 11. The protruding portion of the diaphragm bolt 65 is engaged with the compressor 61, and the compressor 61 and the diaphragm 12 are connected.

  FIG. 6 is a bottom view of the compressor 61 as viewed from the flow path 24 side. The compressor 61 has a circular central portion 611 as viewed from the bottom, and a plurality of protrusions 612a, 612b, 613a, 613b, 614a, 614b, 615a, 615b that protrude outward from the central portion 611. . An insertion hole 616 into which the diaphragm bolt 65 is inserted is formed in the central portion 611. The insertion hole 616 has a circular hole 616a and a pair of notches 616b formed at the edge of the circular hole 616a. The pair of notches 616b are provided with locking pins 73 of the diaphragm bolt 65 described later. They are formed facing each other so that they can be inserted.

  In FIG. 6, eight protrusions 612a, 612b, 613a, 613b, 614a, 614b, 615a, and 615b are formed at an equal angle (about 45 degrees). Opposite diametrically. In other words, the pair of protrusions 612a and 612b are provided along the straight line passing through the central axis O of the circular hole 616a with the center 611 interposed therebetween. Further, a pair of protrusions 613a and 613b are provided along a straight line passing through the center axis O of the circular hole 616a with the center 611 interposed therebetween. A pair of protrusions 614a and 614b are provided along a straight line passing through the central axis O of the circular hole 616a with the center 611 interposed therebetween. Further, a pair of protrusions 615a and 615b are provided with a central portion 611 interposed along a straight line passing through the central axis O of the circular hole 616a.

  The protrusions 612a, 612b, 614a, 614b protrude from the central portion 611 by the same length. The protruding portions 613a, 613b, 615a, 615b protrude from the central portion 611 by the same length. The lengths of the protrusions 612a, 612b, 614a, 614b are longer than the lengths of the protrusions 613a, 613b, 615a, 615b. The angle between the pair of protrusions 612a, 612b and the pair of protrusions 614a, 614b is formed at substantially 90 degrees. The angle between the pair of protrusions 613a, 613b and the pair of protrusions 615a, 615b is formed at substantially 90 degrees.

  As shown in FIG. 6, a concave portion 611c is formed in the center of the surface of the central portion 611 of the compressor 61 on the contact portion 33a side, and the convex portion 124 of the diaphragm 12 is inserted (see FIG. 4).

(1-5-2. Sleeve 62, stem 63, handle 64)
The sleeve 62 is supported by the through hole 13b of the bonnet 13, as shown in FIG. A screw shape is formed inside the sleeve 62.

  The stem 63 is disposed inside the sleeve 62, and is screwed with a screw shape formed inside the sleeve 62. A compressor 61 is fixed to an end of the stem 63 disposed inside the hood 13. The compressor 61 is engaged with the diaphragm 12 on the valve body 11 side, and is fixed to the stem 63 on the side opposite to the valve body 11.

  The handle 64 is fitted to an outer peripheral portion of a portion of the stem 63 located outside the bonnet 13.

(1-5-3. Diaphragm bolt 65)
FIG. 7 is a perspective view showing the diaphragm bolt 65. FIG. 8 is a sectional view taken along the line DD ′ in FIG. The diaphragm bolt 65 is made of, for example, metal, and connects the diaphragm 12 to the drive mechanism 14. The diaphragm bolt 65 has one end embedded in the diaphragm 12 and the other end locked to the compressor 61.

The diaphragm bolt 65 has a shaft portion 71, an insertion portion 72, and a pair of locking pins 73.
The shaft portion 71 has a cylindrical shape and is arranged along the central axis O. Since the central axis O is along the driving direction of the diaphragm 12, the compressor 61 or the stem 63 (see FIGS. 11A and 11B to be described later), the shaft 71 is formed by the diaphragm 12, the compressor 61 or the stem. It can also be said that they are arranged along the 63 driving direction.

  The shaft portion 71 has a first end 71a arranged on the diaphragm 12 side and a second end 71b arranged on the stem 63 side. The shaft portion 71 has a cylindrical portion 81 and a reduced diameter portion 82. The column portion 81 has a second end 71b. The reduced diameter portion 82 is provided on the side of the diaphragm 12 of the cylindrical portion 81 and is formed in a truncated cone shape such that the diameter gradually decreases toward the contact portion 33a.

  The insertion portion 72 is inserted into the projection 124 of the diaphragm 12 by insert molding, as shown in FIG. The insertion portion 72 has a central portion 91 and four projecting portions 92a, 92b, 92c, 92d. The central portion 91 is connected to the first end 71a of the shaft portion 71. The four protruding portions 92a, 92b, 92c, 92d protrude from the central portion 91 by the same length in the direction perpendicular to the central axis O. As shown in FIG. 8, in a plan view perpendicular to the central axis O, the four protrusions 92a, 92b, 92c, and 92d are provided at 90-degree intervals, and the insertion portions 72 are arranged in a cross shape. Have been. A pair of projecting portions 92a and 92c are arranged with a central portion 91 interposed along a straight line La passing through the central axis O. In addition, a pair of protrusions 92b and 92d are arranged with the central portion 91 interposed along a straight line Lb passing through the central axis O.

  Further, in the present embodiment, the pair of protrusions 92b and 92d are arranged in the width direction Y so as to extend along the contact portion 33a, and the pair of protrusions 92a and 92c It is arranged along X.

  FIG. 9 is a sectional view taken along the arrow EE ′ in FIG. FIG. 9 can also be said to be a cross-sectional view including the central axis O and the straight line La near the insertion portion 72. FIG. 9 shows a cross section passing through the protruding portions 92a and 92c.

  The direction in which the insertion section 72 moves when the flow path 24 is opened is defined as an opening direction Z1, and the direction in which the insertion section 72 moves when the flow path 24 is closed is defined as a closing direction Z2.

  As shown in FIG. 9, the insertion portion 72 has an opening side 93 and a closing side 94 arranged along the central axis. The opening direction side portion 93 is a portion of the insertion portion 72 on the opening direction Z1 side, and can also be said to be a portion on the shaft portion 71 side. The closing direction side portion 94 is a portion of the insertion portion 72 on the closing direction Z2 side, and can be said to be a portion of the insertion portion 72 on the contact portion 33a side.

  The opening direction side surface 93a, which is the surface of the opening direction side portion 93, is formed to be convexly curved toward the opening direction Z1 so as to have no corners. The closing direction side surface 94a which is the surface of the closing direction side portion 94 is formed to be convexly curved in the closing direction Z2. The boundary 95 between the opening side surface 93a and the closing side surface 94a is shown in FIG. The boundary 95 is provided over the entire circumference of the insertion section 72. The plane including the boundary 95 is perpendicular to the central axis O. In FIG. 7, the tips of the protrusions 92 a, 92 b, 92 c, and 92 d of the boundary 95 are indicated by solid lines as the boundary 95 a, and the portions of the boundary 95 other than the boundary 95 a are the boundary 95 b As a dotted line. In FIG. 9, a plane including the boundary 95 (also referred to as a boundary surface between the open side 93 and the closed side 94) is indicated by a line F.

  Further, the opening side surface 93 a is formed from the boundary 95 to the connection portion 96 with the shaft portion 71. In addition, the opening direction side surface 93a is formed from the boundary 95 to the connection portion 96 so as to be located in the direction of the central axis O toward the opening direction Z1.

  The connection portion 96 is formed in a circular shape shown in FIG. The plane including the connection portion 96 is perpendicular to the central axis O. In FIG. 9, a plane including the connection portion 96 is indicated by a line G.

  The boundary 95 between the opening-side surface 93a and the closing-side surface 94a is the outermost periphery of the insertion portion 72, as shown in FIGS.

  Here, in a side view, assuming that an angle formed by a line L3 connecting the boundary portion 95a and the connection portion 96 and the line F is θc, a line L1 which is a tangent to the opening direction side surface 93a in the boundary portion 95a and a boundary surface The angle θ1 formed by F satisfies the equation (1) θc ≦ θ1 ≦ 90 °. The line L1 can be said to be a straight line that passes through the boundary portion 95a and has the inclination of the opening-side surface 93a at the boundary portion 95a. Note that the angle at which the inside of the boundary portion 95a of the line L1 (in the direction approaching the central axis O) rotates in the opening direction Z1 side of the boundary portion 95a is a positive angle, and the inside of the boundary portion 95a of the line L1 ( The angle at which the side closer to the central axis O rotates toward the closing direction Z2 than the line F is defined as a negative angle.

  The angle θ2 formed by the line L2 and the line G, which are tangents to the opening-side surface 93a of the connection portion 96, satisfies the expression (2) 0 ° ≦ θ2. The line L2 can be said to be a straight line passing through the connecting portion 96 and having the inclination of the open surface 93a of the connecting portion 96. Note that the angle at which the outside of the connection portion 96 of the line L2 (on the side deviating from the center axis O) rotates in the closing direction Z2 side of the line G is a positive angle, and the outside of the connection portion 96 of the line L2 (center The angle at which the axis (the direction deviating from the axis O) rotates toward the opening direction Z1 with respect to the line G is defined as a negative angle.

  Although the configuration of the insertion portion 72 on the left side has been described with reference to the center axis O in FIG. 9, the configuration on the right side is also the same, and is symmetrical with respect to the center axis O.

  FIG. 9 illustrates the protrusion 92a and the protrusion 92c, but the same applies to the protrusion 92b and the protrusion 92d.

  The above equations (1) and (2) hold on the same side with respect to the central axis O. For example, the line L1 does not connect the left boundary portion 95a and the right connection portion 96 in FIG. 9, but the left boundary portion 95a and the left connection portion 96, or the right boundary portion 95a and the right connection portion 96. Thus, the connecting portion 96 is connected to the boundary portion 95a of the same protruding portions 92a, 92b, 92c, 92d. In this embodiment, the boundary portion 95b other than the boundary portion 95a at the tip of the boundary 5 does not satisfy the above expression (1), but may satisfy the expression (1).

  FIG. 10 is an enlarged view showing the vicinity of the diaphragm bolt 65 of FIG. As shown in the drawing, the surface of the insertion portion 72 (the opening side surface 93a and the closing side surface 94a) inserted into the diaphragm 12 and the surface of the reduced diameter portion 82 (shown by a thick line) are in contact with the diaphragm 12. It is a contact surface.

  When the diaphragm 12 is moved in the opening direction Z1, stress is generated between the opening surface 93a of the contact surface and the diaphragm 12, but as in the present embodiment, the opening surface having no corners formed therein. The stress can be reduced by 93a.

  The pair of locking pins 73 are provided on the second end 71b side of the shaft portion 71. The pair of locking pins 73 protrude from the side surface of the shaft portion 71 on opposite sides. The diaphragm bolt 65 is inserted into the insertion hole 616 from the second end 71b side such that the pair of locking pins 73 pass through the pair of notches 616b of the compressor 61. Thereafter, by rotating the diaphragm bolt 65 about the central axis O, the locking pin 73 is locked to the compressor 61 as shown in FIG.

<2. Operation>
Next, the operation of the diaphragm valve 10 of the present embodiment will be described. FIGS. 11A and 11B are diagrams schematically showing the operation of the diaphragm 12. FIG.

  When the handle 64 is rotated in a direction to close the flow path 24 from a state where the flow path 24 is open as shown in FIG. 11A, the stem 63 is lowered according to the rotation of the handle 64 (see FIG. 2). . As the stem 63 descends, the compressor 61 fixed to the end of the stem 63 also descends.

  When the compressor 61 is lowered, the diaphragm 12 is curved convexly to the contact portion 33a side and pressed against the contact portion 33a of the wall portion 33 as shown in FIG.

As a result, the flow path 24 of the diaphragm valve 10 is shut off.
On the other hand, when the handle 64 is rotated in the opening direction, the stem 63 rises as the handle 64 rotates. With the rise of the stem 63, the compressor 61 also rises, and the central portion of the diaphragm 12 engaged with the compressor 61 rises as shown in FIG.
As a result, the flow path 24 of the diaphragm valve 10 is opened.

<3. Example>
Next, a description will be given of the results of a study on stress using the embodiment of the insertion portion 72 in which the values of θ1 and θ2 are changed.

  FIG. 12 is a cross-sectional view showing the insertion portion 72 of the first embodiment formed so that θ1 = 45 ° ≧ θc and θ2 = 0 °. The opening direction side surface 93a of the insertion portion 72 of the first embodiment is formed to be convexly curved toward the opening direction Z1 in a side view.

  FIG. 13 is a cross-sectional view showing the insertion portion 72 of the second embodiment formed so that θ1 = 90 ° ≧ θc and θ2 = 0 °. The opening direction side surface 93a of the insertion section 72 of the second embodiment is formed to be convexly curved toward the opening direction Z1 in a side view.

  FIG. 14 is a cross-sectional view showing the insertion portion 72 of the third embodiment formed so that θ1 = 30 ° ≧ θc and θ2 = 30 °. The opening direction side surface 93a of the insertion section 72 of the third embodiment is formed substantially in a straight line in a side view.

  15 to 18 show the insertion portions 720 of Comparative Examples 1 to 4. The insertion portion 720 has a cross shape in plan view similarly to the insertion portion 72, but differs from the insertion portion 72 of the embodiment in the following points.

  FIG. 15 is a cross-sectional view showing the insertion portion 720 of Comparative Example 1 in which the angle is formed when θ1 = 45 ° ≧ θc and θ2 = 0 °. The opening direction side surface 93a in FIG. 16 is formed by two straight lines in a side view. That is, the opening-side surface 93a of the insertion portion 720 is formed perpendicularly to the center axis O (θ2 = 0 °) from the first surface portion 93a1 formed at θ1 = 45 ° from the boundary portion 95a and the connecting portion 96. The second surface portion 93a2 is formed. A corner 97 is formed at the intersection of the first surface 93a1 and the second surface 93a2. In this comparative example 1, unlike the example, a corner is formed on the opening direction side surface 93a.

  FIG. 16 is a cross-sectional view showing the insertion portion 720 of Comparative Example 2 in which the angle is formed when θ1 = 90 ° ≧ θc and θ2 = 0 °. The opening direction side surface 93a in FIG. 16 is formed by two straight lines in a side view. That is, the opening-side surface 93a of the insertion portion 720 is formed perpendicularly to the center axis O (θ2 = 0 °) from the first surface portion 93a1 formed at θ1 = 90 ° from the boundary portion 95a and from the connection portion 96. The second surface portion 93a2 is formed. A corner 97 is formed at the intersection of the first surface 93a1 and the second surface 93a2. In the present comparative example 2, unlike the example, a corner is formed on the opening direction side surface 93a.

  FIG. 17 is a cross-sectional view showing the insertion portion 720 of Comparative Example 3 formed at θ1 = 30 ° <θc and θ2 = 45 °. In Comparative Example 3, since θ1 = 30 ° and θ2 = 45 °, the opening-side surface 93a is curved convexly in the closing direction Z2. In Comparative Example 3, unlike Example, θ1 is smaller than θc.

  FIG. 18 is a cross-sectional view illustrating the insertion portion 720 of Comparative Example 4 formed at θ1 = 120 ° and θ2 = −30 °. In Comparative Example 4, unlike Example, θ2 is smaller than 0 °.

  FIG. 19 is a table showing the maximum principal stresses in Examples 1 to 3 and Comparative Examples 1 to 4. It is preferable that the maximum principal stress is smaller than 100.

  As shown in FIG. 19, in Comparative Example 1, the maximum principal stress in the opening direction Z1 is 105 MPa, and stress concentrates on the corner 97 in the contact surface in the opening direction.

  In Example 1, the maximum principal stress in the opening direction Z1 was 60 MPa, and the stress concentration was less than that in Comparative Example 1.

  In Comparative Example 2, the maximum principal stress in the opening direction Z1 is 140 MPa, and stress concentrates at the corner 97 in the contact surface in the opening direction.

  In Example 2, the maximum principal stress in the opening direction Z1 was 60 MPa, and the stress concentration was less than that in Comparative Example 2.

  In Comparative Example 3, the maximum principal stress in the opening direction Z1 is 115 MPa, and stress concentrates on the contact surface in the opening direction Z1 between the boundary portion 95a and the connection portion 96 and on the boundary portion 95a.

  In Example 3, the maximum principal stress in the opening direction Z1 was 85 MPa, and the stress concentration was less than that in Comparative Example 3.

  In Comparative Example 4, the maximum principal stress in the opening direction Z1 is 110 MPa, and stress concentrates near the connection portion 96 in the contact surface in the opening direction Z1.

  It can be seen from Examples 1 and 2 and Comparative Examples 1 and 2 that it is preferable that the opening-side surface 93a has no corner.

  From Example 3 and Comparative Example 3, it is understood that θ1 is more preferably θc or more and 90 ° or less.

  Further, from Example 3 and Comparative Example 4, it is understood that θ2 is more preferably 0 ° or more and 90 ° or less.

<4. Features>
(4-1)
The diaphragm valve 10 of the present embodiment includes a valve body 11, a diaphragm 12 (an example of a valve section), a drive mechanism 14, and a diaphragm bolt 65 (an example of a connection section). The valve body 11 has a flow path 24, an opening 31a, and a contact part 33a. The channel 24 is formed inside. The opening 31a is formed in the middle of the flow path 24. The contact portion 33a is provided at a position corresponding to the opening 31a of the flow path 24. The diaphragm 12 is disposed so as to close the opening 31a, and can close the flow path 24 by contacting the contact portion 33a. The drive mechanism 14 opens and closes the flow path 24 by driving the diaphragm 12. The diaphragm bolt 65 connects the diaphragm 12 and the drive mechanism 14. The diaphragm bolt 65 has a shaft portion 71 and an insertion portion 72. The shaft portion 71 is arranged along the driving direction Z of the diaphragm 12. The insertion portion 72 is provided at a first end 71 a (an example of a distal end) of the shaft portion 71 on the contact portion 33 a side, and is inserted into the diaphragm 12. The insertion portion 72 is provided on the opposite side of the valve body 11 and has an opening-side surface 93a (an example of a first surface) having no corner, and a closing-direction side surface 94a (a first surface) provided on the valve body 11 side. 2 example).

As described above, since the opening-side surface 93a formed in the opening direction Z1 of the insertion portion 72 inserted into the valve body 11 has no corner, the valve body 11 is opened when the valve body 11 is moved in the opening direction Z1. The stress generated between the direction side surface 93a and the valve body 11 can be reduced.
Thereby, the long-term performance of the diaphragm valve 10 can be improved.

(4-2)
In the diaphragm valve 10 of the present embodiment, the outermost surfaces of the opening-side surface 93a (an example of the first surface) and the closing-side surface 94a (an example of the second surface) are the opening-side surface 93a and the closing-side surface. This is the boundary 95 of 94a.

  Thereby, no corner is formed on the opening direction Z1 side of the insertion portion 72, and the stress when the valve body 11 is moved in the opening direction Z1 can be reduced.

(4-3)
In the diaphragm valve 10 of the present embodiment, in a side view, a boundary portion 95a (a predetermined portion of a boundary portion 95) of a boundary 95 between the opening direction side surface 93a (an example of the first surface) and the closing direction side surface 94a (an example of the second surface). A straight line L1 (an example of a first straight line) having an inclination of the opening direction side surface 93a (an example of the first surface) at the boundary portion 95a through the boundary portion 95a and a direction along the axis portion 71 through the boundary portion 95a. The angle θ1 formed by the vertical straight line F (an example of a second straight line) is a straight line L2 (an example of a third straight line) connecting the boundary portion 95a and the connecting portion 96 of the shaft portion 71 with the opening direction side surface 93a. When an angle formed by the straight line F and θc is θc, the expression (1) θc ≦ θ1 ≦ 90 ° is satisfied.

  Thereby, since the opening direction side surface 93a is formed at least one of the inclined surface and the curved surface bulging outward, the stress can be reduced.

(4-4)
In the diaphragm valve 10 of the present embodiment, irregularities are formed on the outer periphery of the insertion portion 72. A boundary portion 95a (an example of a predetermined portion) of the boundary 95 is a tip of the protruding portions 92a, 92b, 92c, and 92d (an example of a convex portion).

  Thereby, when moving the valve main body 11 in the opening direction Z1, the stress generated at the tips of the protruding portions 92a, 92b, 92c, 92d can be reduced. Note that the space between the protruding portions 92a, 92b, 92c, and 92d corresponds to an example of a concave portion.

(4-5)
In the diaphragm valve 10 of the present embodiment, a straight line that passes through the connecting portion 96 between the opening-side surface 93a (an example of the first surface) and the shaft portion 71 and is perpendicular to the direction along the shaft portion 71 in side view. An angle θ2 formed by G (an example of a fourth straight line) and a straight line L2 (an example of a fifth straight line) passing through the connecting portion 96 and having an inclination of the opening-side surface 93a of the connecting portion 96 is equal to or greater than 0 °. .

  Accordingly, the surface 93a on the opening direction side from the connection portion 96 does not protrude toward the shaft portion 71, so that the stress can be reduced.

[Other embodiments]
As mentioned above, although one Embodiment of this invention was described, this invention is not limited to the said Embodiment, A various change is possible within the range which does not deviate from the summary of this invention.

(A)
In the above embodiment, the four projecting portions 92a, 92b, 92c, and 92d are formed so that the insertion portion 72 of the diaphragm bolt 65 has a cross shape in a plan view. However, the present invention is not limited thereto. Only two protrusions may be provided. Further, for example, as shown in a diaphragm bolt 65 ′ in FIG. 20A, a disc-shaped insertion portion 72 ′ may be arranged at the first end 71 a of the shaft portion 71. FIG. 20B is a cross-sectional view taken along the line HH ′ in FIG. FIG. 20C is a cross-sectional view taken along the arrow JJ ′ in FIG. As shown in FIGS. 20B and 20C, the insertion portion 72 'protrudes outward from the first end 71a in a plan view perpendicular to the driving direction Z of the diaphragm 12.

  Further, the disc-shaped insertion portion 72 ′ is formed so as to protrude from the central portion 91 ′ connected to the first end 71 a of the shaft portion 71 in a direction perpendicular to the central axis O from the central portion 91 ′. It can also be said that it has an annular projecting portion 92 '. The insertion portion 72 'is inserted into the diaphragm 12 by insert molding. A boundary 95 'between the opening direction side surface 93a and the closing direction side surface 94a in the insertion portion 72' is formed in a substantially circular shape, and satisfies the above expression (1) over the entire circumference of the boundary 95 '. Thereby, when moving the valve main body 11 in the opening direction Z1, it is possible to reduce the stress generated on the entire circumference of the insertion portion 72 '. The insertion portion 72 ′ is not limited to a circular shape but may be an elliptical shape in a plan view perpendicular to the central axis O.

  Thereby, it is possible to prevent the diaphragm bolt 65 from coming off from the diaphragm 12 and to make the protruding ridge 122 adhere to the contact part 33a.

  It is preferable that the insertion portions 72 and 72 ′ have a shape that is symmetrical with respect to the central axis O when viewed from the flow direction X.

(B)
In the above embodiment, the diaphragm bolt 65 is locked to the compressor 61 by the locking pin 73, but the method of connecting to the compressor 61 is not limited to the locking pin 73. Even if the locking pin 73 is not provided, the thread shape is formed around the second end 71b of the diaphragm bolt 65 and the recess 611c of the compressor 61, and the diaphragm bolt 65 is connected to the compressor 61 by screwing. Good.

(C)
In the above embodiment, the eight protrusions 612a, 612b, 613a, 613b, 614a, 614b, 615a, and 615b are provided, but this is not a limitation. For example, when the size of the compressor 61 is small, the shorter protrusions 613a, 613b, 615a, and 615b may not be provided. Further, the protrusions 612a and 612b that do not extend along the protrusion 122 may not be provided.

(D)
In the above embodiments and examples, the opening direction side surface 93a is formed by a straight line or a curved line in a side view, but may be formed by a combination of a straight line and a curved line.

(E)
In the diaphragm valve 10 of the above-described embodiment, the manual handle 64 is provided as an example of the driving unit. However, the stem 63 may be driven by an air-driven or electrically-driven driving unit.

  INDUSTRIAL APPLICABILITY The diaphragm valve of the present invention exhibits an effect capable of improving long-term performance, and can be used in plants and the like.

10: Diaphragm valve 11: Valve body 12: Diaphragm 14: Driving mechanism 24: Flow path 31a: Opening 33a: Contact part 61: Compressor 65: Diaphragm bolt 71: Shaft 71a: First end 72: Insertion part 93a: Opening direction side surface 94a: Closing direction side surface

Claims (6)

A valve body having a flow passage formed therein, an opening formed in the middle of the flow passage, and a contact portion provided at a position corresponding to the opening of the flow passage,
A valve unit that is arranged to close the opening, and that can close the flow path by contacting the abutting portion,
A drive mechanism that opens and closes the flow path by driving the valve unit,
A connection unit that connects the valve unit and the drive mechanism,
The connecting portion,
A shaft portion arranged along a driving direction of the valve portion,
An insertion portion connected to a tip of the shaft portion on the contact portion side and inserted into the valve portion;
The insertion portion is provided on the opposite side of the valve body, has a first surface on which no corner is formed, and a second surface provided on the valve body side.
Diaphragm valve. The outermost of the first surface and the second surface is a boundary between the first surface and the second surface,
The diaphragm valve according to claim 1. In a side view, a first straight line having an inclination of the first surface at the predetermined portion of the boundary passing at least a predetermined portion of a boundary between the first surface and the second surface, and passing the predetermined portion of the boundary, The angle θ1 formed by the second straight line perpendicular to the direction along the axis is:
Assuming that an angle formed by the third straight line connecting the predetermined portion of the boundary, the first surface and the connecting portion of the shaft portion, and the second straight line is θc, the equation (1) θc ≦ θ1 ≦ 90 ° meet,
The diaphragm valve according to claim 1. On the outer periphery of the insertion portion, irregularities are formed,
The predetermined portion of the boundary is a tip of a convex portion,
The diaphragm valve according to claim 3. The outer periphery of the insertion portion is circular,
The boundary is an outer periphery of the insertion portion,
In the entire circumference of the boundary, the expression (1) is satisfied.
The diaphragm valve according to claim 3. In a side view, a fourth straight line passing through the connecting portion between the first surface and the shaft portion and perpendicular to a direction along the shaft portion, and an inclination of the first surface at the connecting portion passing through the connecting portion. The angle θ2 formed by the fifth straight line having
The diaphragm valve according to claim 1.

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