JP5850876B2 - Ball valve - Google Patents

Description

  The present invention relates to a ball valve that opens and closes a flow path through which a fluid flows.

  Conventional ball valves have been disclosed in, for example, Japanese Utility Model Laid-Open No. 7-10648 (Patent Document 1), Japanese Patent Application Laid-Open No. 2011-202707 (Patent Document 2) and Japanese Patent Application Laid-Open No. 2012-67816 (Patent Document 3). There is something.

  In Patent Document 1, a ball storage chamber that communicates with an inlet and a filter storage chamber that communicates with a ball storage chamber and an outlet are formed, and a pair of seat rings are attached to both left and right ends of the ball storage chamber. A ball is mounted between the seat rings. The ball has an angle-shaped communication hole that allows the inlet and the filter storage chamber (outlet side) to communicate with each other.

  In Patent Documents 2 and 3, a communication chamber that communicates with a gas inlet and a gas outlet is formed in a body body, and a first and a second are formed on a gas inlet side and a gas outlet side in the communication chamber. A valve seat is provided, and a ball (ball valve) is mounted between both valve seats. The gas inlet and the gas outlet are provided on a substantially straight line, and a communication hole (through hole) that allows the gas inlet and the gas outlet to communicate with each other is formed in the ball.

Japanese Utility Model Publication No. 7-10648 JP 2011-202707 A JP 2012-67816 A

  In the conventional ball valve, a pair of sealing elastic members such as a seat ring and a valve seat are brought into contact with each other so as to be sandwiched between the balls. The elastic member for sealing blocks the connection between the ball communication hole and the inlet / outlet when the flow path is cut off, and connects the ball communication hole with the inlet / outlet when the flow path is opened. Is sealed from the valve chamber (ball storage chamber or communication chamber). As described above, in the conventional ball valve, since the pair of sealing elastic members are sandwiched between the balls, the sliding resistance generated between the balls and the sealing elastic members is increased, and the balls are driven to rotate. I needed a lot of power to make it happen.

  An object of the present invention is to reduce a rotational resistance when a ball is rotationally driven in a ball valve by reducing a sliding resistance against the ball.

The ball valve according to claim 1 is a spherical ball valve body, and includes a ball valve body having an angle-shaped communication hole formed by a first communication hole and a second communication hole formed from the surface toward the center. A valve body and a valve body having a first opening and a second opening communicating with the valve chamber, the ball valve body is disposed in the valve chamber, and the ball valve body is rotated. In the ball valve capable of transitioning between the state in which the first opening and the second opening are conducted by the angle-shaped communication hole and the state in which the first opening and the second opening are not conducted. An elastic member for sealing disposed between the second opening and the ball valve body, and sealing the second opening and the valve chamber by being pressed against the spherical surface of the ball valve body; The ball valve body is disposed on the opposite side of the sealing elastic member across the ball valve body. To the supporting pressure member having abutting abutment surface, said supporting the pressing member and a biasing means for biasing said ball valve body side, the abutment surface of the supporting pressure member is spherical It is a concave surface, and the radius of curvature of the contact surface is larger than the radius of curvature of the surface of the ball valve body .

  According to the ball valve of the first aspect, since the ball valve body is pressed toward the sealing elastic member by the supporting pressing member and the biasing means, the valve chamber and the secondary side opening are sealed. One elastic member for sealing may be used.

Further, since the contact surface of the support pressing member has a radius of curvature larger than the curvature radius of the surface of the ball valve body, the contact surface of the support press member and the spherical surface of the ball valve body come into contact at one point. Therefore , the sliding resistance acting on the ball valve body when the ball valve body is rotated can be reduced, and a large force is not required for rotationally driving the ball valve body.

Further, since the contact surface of the support pressing member is a concave surface, the centers of the support pressing member and the ball valve body coincide with each other, and the ball valve body can be uniformly pressed against the sealing elastic member. .

It is a partial cross section figure of the closed state of the ball valve of a 1st embodiment of the present invention. It is a partial cross section figure of the open state of the ball valve of a 1st embodiment of the present invention. It is an expanded sectional view of a pressing member for support of a ball valve of an embodiment of the present invention, and a portion of a coil spring. It is a partial cross section figure of the open state of the ball valve of 2nd Embodiment of this invention. It is a partial cross section figure of the closed state of the ball valve of a 2nd embodiment of the present invention. It is a figure which shows the other example of the elastic member in the ball valve of embodiment of this invention, and the press member for support.

  Next, an embodiment of the ball valve of the present invention will be described with reference to the drawings. FIG. 1 is a partial cross-sectional view of the ball valve according to the first embodiment in a closed state, and FIG. 2 is a partial cross-sectional view of the ball valve according to the first embodiment in an open state. Note that the concept of “upper and lower” in the following description corresponds to the upper and lower sides in the drawing of FIG. The ball valve according to the first embodiment includes a valve main body 1, a ball valve body 2, a seal member 3 as a “sealing elastic member”, a supporting pressing member 4, and a coil spring as a “biasing member”. 5, a lid member 6, and a rotating shaft 7. In the figure, the alternate long and short dash line indicated by reference numeral L1 is an axis passing through the centers of the ball valve element 2 and the rotary shaft 7, and the alternate long and short dash line indicated by reference numeral L2 is a secondary central axis orthogonal to the axial line L1.

  The valve body 1 is formed with a valve chamber 1A inside thereof. Further, the valve body 1 has a primary side opening 11 as a “first opening” communicating with the valve chamber 1A and a secondary side opening as a “second opening” centered on the secondary side central axis L2. 12, a secondary port 12a that communicates the secondary side opening 12 and the valve chamber 1A is formed. Further, the valve body 1 has a seal member fitting portion 13 that forms the periphery of the secondary chamber 12a around the axis L2 on the valve chamber 1A side, and a rotary shaft holding hole that communicates with the valve chamber 1A around the axis L1. 14 and an assembling hole 15 having a slightly larger diameter than the ball valve body 2 is formed in communication with the valve chamber 1A around the secondary side central axis L2.

  The ball valve body 2 has a spherical shape and is disposed in the valve chamber 1A. The ball valve body 2 is formed with a first communication hole 21 and a second communication hole 22 from the surface toward the center. The first communication hole 21 and the second communication hole 22 are the center of the ball valve body 2. Communicate with each other. Thereby, the 1st communicating hole 21 and the 2nd communicating hole 22 comprise 2 A of angle-shaped communicating holes. In addition, the ball valve body 2 is formed with a fitting groove 23 at the upper end in the direction of the axis L1 in a direction perpendicular to the axis L1.

  The seal member 3 has a mortar-shaped taper surface 31 in contact with the surface of the ball valve body 2 on the ball valve body 2 side. Further, the seal member 3 has an opening 32 having a slightly larger diameter than the secondary side port 12a. The taper surface 31 of the seal member 3 is fitted to the seal member fitting portion 13 of the valve body 1 in a state where the taper surface 31 is pressed against the spherical surface of the ball valve body 2.

  The lid member 6 is formed with a pressing member fitting portion 61, a coil spring accommodating portion 62, a male screw portion 63, a seal groove 64, and a jig hole 65. A supporting pressing member 4 (described later) is disposed in the pressing member fitting portion 61, and a coil spring 5 is disposed in the spring accommodating portion 62. In addition, an O-ring 64 a is fitted in the seal groove 64. The lid member 6 engages the jig with the jig hole 65 in a state where the supporting pressing member 4 is in contact with the ball valve body 2, and the outer peripheral male threaded portion 63 is connected to the outer peripheral surface of the assembly hole 15. It is attached to the valve body 1 by being screwed into the female screw portion 15a formed in the valve body. That is, the supporting pressing member 4 is disposed on the opposite side of the seal member 3 with the ball valve body 2 interposed therebetween, and the contact surface 4A is in contact with the spherical surface of the ball valve body 2. As a result, the coil spring 5 is disposed in a compressed state between the bottom of the spring accommodating portion 62 and the supporting pressing member 4, so that the ball valve body 2 is in close contact with the sealing member 3. Is energized. Further, the assembly hole 15 (and the valve chamber 1 </ b> A) and the outside of the valve body 1 are hermetically sealed by the O-ring 64 a fitted in the seal groove 64.

  The rotating shaft 7 is a columnar member, and is provided with two cylindrical flange bodies having an outer diameter substantially the same as the inner diameter of the rotating shaft holding hole 14 provided in the middle of the shaft main body 71 in the axis L direction. 72 and 73 are integrated. A through hole 1 a is formed above the rotary shaft holding hole 14 of the valve main body 1 and has an axis L1 formed to have a diameter substantially the same as the outer diameter of the shaft main body 71 of the rotary shaft 7. A packing 7 a is disposed on the through hole 1 a side of the flange portion 72, and an O-ring 7 b is disposed between the flange portion 72 and the flange portion 73. Thereby, the rotating shaft holding hole 14 (and the valve chamber 1A) and the outside of the valve body 1 are hermetically sealed.

  A slight clearance is provided between the peripheral surface of the through hole 1 a and the outer peripheral surface of the shaft body 71, and the through hole 1 a functions as a bearing portion of the rotating shaft 7. Thereby, the rotating shaft 7 penetrates the valve body 1 and is supported so as to be rotatable around the axis L1. The rotating shaft 7 has a fitting claw portion 74 in the diameter direction (a direction orthogonal to the axis L1) at the lower end portion on the ball valve body 2 side. The fitting groove 23 is fitted. Thereby, the ball valve body 2 and the rotating shaft 7 can rotate integrally with each other in the rotating direction around the axis L1. Although not shown, a slight clearance is provided between the fitting groove 23 and the fitting claw portion 74. As a result, the ball valve body 2 is pressed by the supporting pressing member 4 and can be moved somewhat in the direction (on the seal member 3 side) as will be described later. The rotating shaft 7 is rotationally driven by a driving means (not shown).

  With the above configuration, the first communication hole 21 of the ball valve body 2 is always connected to the primary side opening 11. In the closed state of FIG. 1, the circular surface of the ball valve body 2 is in close contact with the tapered surface 31 of the seal member 3, the second communication hole 22 and the secondary side opening 12 are shielded, and the primary side opening 11 and The secondary side opening 12 is blocked. When the ball valve body 2 rotates around the axis L and the second communication hole 22 is positioned to face the secondary side opening 12 as shown in FIG. 2, the primary side opening 11 and the secondary side opening 12 are in an angular shape. Conduction is established through the communication hole 2A (the first communication hole 21 and the second communication hole 22).

  Here, the valve chamber 1A, the assembly hole 15 and the rotary shaft holding hole 14 are always in conduction with the primary side opening 11, but the valve chamber 1A, the assembly hole 15 and the rotary shaft holding hole 14 are connected to the valve body. 1 and the secondary side opening 12 are hermetically sealed. Accordingly, the pressure of the fluid flowing into the primary side opening 11 acts on the ball valve body 2 and also acts to press the ball valve body 2 against the seal member 3. Further, only one of the seal members 3 is required to hermetically seal the primary side opening 11 and the secondary side opening 12 at portions other than the angle-shaped communication hole 2A.

FIG. 3 is an enlarged sectional view of the supporting pressing member 4 and the coil spring 5. The supporting pressing member 4 is formed of a relatively hard synthetic resin such as a fluororesin such as polyamide (PA) or polytetrafluoroethylene (PTFE). The support pressing member 4 of this embodiment has a disc shape as a whole, the contact surface 4A on the ball valve body 2 side is a concave surface (spherical surface), and the back surface on the coil spring 5 side is a flat surface (flat surface). ing. The curvature radius of the contact surface 4A (the curvature radius with respect to the center on the ball valve body 2 side) is larger than the curvature radius of the surface of the ball valve body 2. Thereby, the contact surface 4A contacts the surface of the ball valve body 2 at one point. As a result, while the supporting pressing member 4 presses the ball valve body 2 with the urging force of the coil spring 5, the sliding resistance between the supporting pressing member 4 and the ball valve body 2 becomes extremely small. Therefore, the sliding resistance acting on the ball valve body 2 when the ball valve body 2 is rotated is a resistance between the ball valve body 2 and the seal member 3. Does not require great force to drive. Further, since the contact surface 4A of the support pressing member 4 is a spherical surface, the centers of the support pressing member 4 and the ball valve body 2 coincide. Therefore, the ball valve body 2 can be evenly pressed against the seal member 3 .

  FIG. 4 is a partial cross-sectional view of the ball valve according to the second embodiment in an open state, and FIG. 5 is a partial cross-sectional view of the ball valve according to the second embodiment in a closed state. 4 and 5, the same members and similar elements as those in the first embodiment are denoted by the same reference numerals, and redundant description is omitted. Although the illustration of the rotation shaft 7 is omitted in FIG. 4, the second embodiment also has a rotation shaft similar to that of the first embodiment.

  The second embodiment differs from the first embodiment in the structure of the valve body 1 'and the ball valve body 2'. The valve body 1 'is formed with a secondary side opening 12 similar to that of the first embodiment, and passes through the axis L2 of the secondary side opening 12 and the center of the ball valve body 2' (and the rotary shaft 7). A primary side opening 11 'is formed on an axis L3 orthogonal to both the axis L1. Further, the angle-shaped communication hole 2A ′ of the ball valve body 2 ′ includes a second conduction hole 22 ′ similar to the second communication hole 22 of the first embodiment and a first conduction hole centered on the axis L3 in the opened state. 21 '. Other structures are the same as those in the first embodiment. The ball valve body 2 'has a fitting groove 23 into which the fitting claw 74 at the lower end of the rotating shaft 7 is fitted, as in the first embodiment.

In the open state of FIG. 4, the first communication hole 21 ′ of the ball valve body 2 ′ is at a position facing the primary side opening 11 ′, and the second communication hole 22 ′ is at a position facing the secondary side opening 12. Thereby , primary side opening 11 'and secondary side opening 12 are conduct | electrically_connected through angle-shaped communication hole 2A'. In the closed state, as shown in FIG. 5, the first communication hole 21 ′ of the ball valve body 2 ′ comes to the position of the support pressing member 4. Further, the second communication hole 22 'comes to the position of the primary side opening 11'.

  In the above embodiment, the example of the coil spring 5 has been described as the “biasing member” that presses the supporting pressing member 4 toward the ball valve body 2 (2 ′). For example, as shown in FIG. A laminate of 5 'may be used. In this case, the spring accommodating portion 62 'can be shallow. Further, as shown in FIG. 6B, the coil spring or the leaf spring may be eliminated, and the supporting pressing member 4 ′ having the contact surface 4A ′ may be fitted into the pressing member fitting portion 61 ′. In this case, the supporting pressing member 4 'is formed of an elastic member, and presses the ball valve body 2 (2') by its elastic force itself. Even in such an example, the sliding resistance acting on the ball valve body 2 when rotating the ball valve body 2 is the resistance between the seal member 3 and the sliding resistance against the ball valve body 2 can be reduced.

  In the above embodiment, the case where the fluid is allowed to flow from the primary side opening 11 (11 ′) and the fluid is allowed to flow from the secondary side opening 12 (12 ′) has been described. The present invention can also be applied to a case where a fluid is introduced from the secondary side opening 12 (12 ′) and a fluid is outputted from the primary side opening 11 (11 ′). In this case, the urging force (spring force) by the coil spring 5 or the leaf spring 5 'is made stronger than the load acting on the ball valve body 2 by the fluid pressure. Further, although only the state where the primary side opening 11 (11 ') and the secondary side opening 12 (12') are conductive and the non-conductive state has been described, the rotation angle of the ball valve body 2 (2 ') is described. Accordingly, the degree of conduction between the primary side opening 11 (11 ') and the secondary side opening 12 (12') can be adjusted to control the flow rate.

1 Valve body 1A Valve chamber 11 Primary side opening (first opening)
12 Secondary side opening (second opening)
2 Ball valve body 21 1st communication hole 22 2nd communication hole 2A Angle-shaped communication hole 2 'Ball valve body 21' 1st communication hole 22 '2nd communication hole 2A' Angle-shaped communication hole 3 Seal member 4 Supporting pressure member 4A Contact surface 5 Coil spring (biasing means)
5 'leaf spring (biasing means)

Claims (1)

A ball valve body having a spherical shape and having an angled communication hole formed by a first communication hole and a second communication hole formed from the surface toward the center, a valve chamber, and the valve chamber. A valve body having a first opening and a second opening that communicate with each other, the ball valve body is disposed in the valve chamber, the ball valve body is rotated, and the angle-shaped communication hole allows the In the ball valve capable of transitioning between a state in which the first opening and the second opening are electrically connected and a state in which the first opening and the second opening are not electrically connected,
An elastic member for sealing disposed between the second opening and the ball valve body, and sealing the second opening and the valve chamber by being pressed against the spherical surface of the ball valve body;
A supporting pressing member that is disposed on the opposite side of the sealing elastic member across the ball valve body and has a contact surface that contacts the spherical surface of the ball valve body;
Biasing means for biasing the supporting pressing member toward the ball valve body;
Equipped with a,
The ball valve according to claim 1, wherein the contact surface of the support pressing member is a spherical concave surface, and a radius of curvature of the contact surface is larger than a radius of curvature of the surface of the ball valve body .

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