JP2010164164A - On-off valve - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide an on-off valve capable of preventing fluid leakage by securely closing an opening by means of a valve element even when a counter pressure is exerted on the valve element in a closed state to push-open it. <P>SOLUTION: In an on-off valve 1 which opens and closes the opening 3 on the valve body 2 by means of the valve element 6 moving in the valve body 2, threads 6a are cut on the outer circumferential surface of the valve element 6 and threads 2a to be selectively screwed in the threads 6a cut on the outer circumferential surface of the valve element 6 are cut on the inner circumferential surface of the valve body 2 near the opening 3. The opening 3 of the valve body 2 is opened and closed by means of the valve element 6 by rotating the valve element 6 while the threads 6a of the valve element 6 are screwed in the threads 2a of the valve body 2. In addition, a rotary clamp cylinder 7 which causes the linear and rotary motions of the valve element 6 in a complex manner is used as an actuator for driving the valve element 6. <P>COPYRIGHT: (C)2010,JPO&INPIT

Description

  The present invention relates to an open / close valve that opens and closes an opening that opens in a valve body by a valve body that moves in the valve body.

  An opening / closing valve is provided in the flow path of fluid such as water or air, and the opening / closing of the opening / closing valve allows or prevents fluid flow. Such open / close valves include, for example, a vacuum valve disclosed in Patent Document 1 and a gate valve disclosed in Patent Document 2, but an L-type valve (angle valve) generally used in FIG. ) And its opening / closing operation is shown in FIGS. 6 (a) and 6 (b).

  5 is a front view of a conventional L-shaped valve, FIGS. 6A and 6B are front sectional views showing the opening and closing operation of the L-shaped valve, and the L-shaped valve 101 shown in FIG. The valve body 106 is linearly moved within the valve body 102 using the air cylinder 107 connected to the body 102 as a drive source, thereby opening the opening 103 as shown in FIG. 6A, and FIG. As shown, the opening 103 is closed by the valve body 106.

  Thus, as shown in FIG. 6A, when the opening 103 of the valve body 102 is open, the pressure P1 on the opening 105 side is a positive pressure higher than the pressure P2 on the opening 103 side (P1>). In P2), the fluid flows from the opening 105 side to the opening 103 side as indicated by an arrow a. On the contrary, the pressure P1 on the opening 105 side is lower than the pressure P2 on the opening 103 side. In the case (P1 <P2), the fluid flows from the opening 103 side to the opening 105 side as indicated by an arrow b.

  Further, as shown in FIG. 6B, when the opening 103 of the valve body 102 is closed by the valve body 106, the fluid flow is blocked.

Japanese Patent No. 2883067 JP 2008-1116016 A

  In the conventional L-shaped valve 101 shown in FIG. 5, the pressure P1 on the opening 105 side when the opening 103 of the valve body 102 is closed by the valve body 106 as shown in FIG. 6B. Is a positive pressure higher than the pressure P2 on the opening 103 side (P1> P2), the differential pressure ΔP (= P1−P2) between the pressures P1 and P2 acts on the upper surface of the valve body 106 and the valve There is no problem because the body 106 is pressed in the closing direction.

  On the contrary, when the pressure P1 on the opening 105 side is a lower pressure than the pressure P2 on the opening 103 side (P1 <P2), the differential pressure ΔP ′ (= P2−P1) between the pressures P1 and P2. Acts on the lower surface of the valve body 106, and this differential pressure ΔP ′ acts on the valve body 106 to push and open the valve body 106. Therefore, when this force exceeds the pushing force of the air cylinder 107, FIG. ), The valve body 106 is lifted from the valve seat 104, and the fluid leaks from the gap. When the fluid leaks in this way, there arises a problem that the vacuum of the chamber or the like is not maintained in the vacuum valve.

  The present invention has been made in view of the above problems, and the object of the present invention is that even when a counter pressure is exerted on the valve body in a closed state to open the valve body, the opening portion is opened by the valve body. Another object of the present invention is to provide an on-off valve that can be reliably closed to prevent fluid leakage.

  In order to achieve the above object, according to a first aspect of the present invention, in an open / close valve that opens and closes an opening that opens in a valve body by a valve body that moves within the valve body, a screw is formed on the outer peripheral surface of the valve body. In addition, a screw that selectively engages with a screw engraved on the outer peripheral surface of the valve body is provided on the inner peripheral surface of the valve body in the vicinity of the opening, and the screw on the valve body side is provided on the valve body side. The valve body is rotated in a state of being screwed to the screw, and the opening of the valve body is opened and closed by the valve body.

  According to a second aspect of the present invention, in the first aspect of the present invention, the actuator for driving the valve body uses a rotary clamp cylinder that performs a combined linear motion and rotational motion of the valve body, and the outer periphery of the valve body. When the screw formed on the valve body and the screw formed on the inner periphery of the valve body are screwed together, the valve body is linearly moved while rotating, and when the screws are released, the valve body is straightened. It is characterized by being configured to move.

  According to the first aspect of the present invention, since the valve body is rotated in a state where the screw on the valve body side is screwed with the screw on the valve body side, the opening of the valve body is opened and closed by the valve body. In the state where the opening of the body is closed by the valve body, the valve body is screwed to the valve body.Therefore, the back pressure is applied to the valve body in the closed state to push it open. However, since the opening is reliably closed by the valve body, fluid leakage is completely prevented. When the valve body in the closed state is reversely rotated to release the threaded connection with the valve body, the valve body opening is opened and closed by linearly moving the valve body away from the valve seat. The valve is opened, allowing fluid to flow.

  According to the second aspect of the present invention, since the rotary clamp cylinder that combines the linear motion and the rotational motion of the valve body is used as the actuator for driving the valve body, the open / close valve is automatically opened and closed. Can do.

It is sectional drawing which shows the structure and opening / closing operation | movement of the on-off valve which concerns on this invention. It is sectional drawing which shows the structure and opening / closing operation | movement of the on-off valve which concerns on this invention. It is sectional drawing which shows the structure and opening / closing operation | movement of the on-off valve which concerns on this invention. It is sectional drawing which shows the structure and opening / closing operation | movement of the on-off valve which concerns on this invention. It is a front view of the conventional L-shaped valve. (A), (b) is front sectional drawing which shows the opening / closing operation | movement of the conventional L-type valve | bulb.

  Embodiments of the present invention will be described below with reference to the accompanying drawings.

  1 to 4 are sectional views showing the configuration and opening / closing operation of an on-off valve according to the present invention. An on-off valve 1 shown in the figure is an automatic valve that is automatically opened and closed by a rotary clamp cylinder 7 described later as an actuator. An opening 3 serving as a fluid inlet / outlet is formed at the bottom of the bottomed cylindrical valve body 2, and the periphery of the opening 3 constitutes a valve seat 4 on which a valve body 6 described later is selectively seated. ing. An opening 5 that is a fluid inlet / outlet is formed on the side of the valve body 2, and fluid piping (not shown) is connected to the opening 5 and the opening 3, respectively.

  Further, a disc-like valve body 6 is movably accommodated in the valve body 2, and a screw 6 a is engraved on the outer periphery of the valve body 6. Then, in the vicinity of the opening 3 on the inner periphery of the valve body 2 (a portion having a predetermined length from the valve seat 4), a screw 2a to which the screw 6a formed on the outer periphery of the valve body 6 is selectively screwed is engraved. It is installed.

  Further, a rotary clamp cylinder 7 as an actuator is mounted on the upper part of the valve body 2, and a rod 7a extending from the rotary clamp cylinder 7 passes through the valve body 2 and faces the inside thereof, and at the lower end thereof, the valve The body 6 is bound. Here, the rotary clamp cylinder 7 performs a combined linear motion and rotational motion of the valve body 6, and the details of the configuration are disclosed in, for example, Japanese Patent Application Laid-Open No. 2001-271807.

  Thus, the rotary clamp cylinder 7 has the rod 7a when the screw 6a formed on the outer periphery of the valve body 6 and the screw 2a formed on the inner periphery of the valve body 2 are screwed as shown in FIG. As shown in FIG. 1, the valve body 6 is linearly moved by the rod 7a when the screws 6a and 2a are unscrewed. In the rotary clamp cylinder 7, the movement stroke of the rod 7 a per rotation coincides with the pitch of the screw 6 a formed on the outer periphery of the valve body 6 and the screw 2 a formed on the inner periphery of the valve body 2.

  Next, the opening / closing operation of the opening / closing valve 1 configured as described above will be described.

  FIG. 1 shows an open state of the on-off valve 1. At this time, the valve body 6 is located above and apart from the valve seat 4 of the opening 3, and the opening 3 is in an open state. At this time, when the pressure P1 on the opening 5 side is a positive pressure higher than the pressure P2 on the opening side (P1> P2), the fluid flows from the opening 5 side to the opening 3 side as indicated by an arrow a. When the pressure P1 on the opening 5 side is a reverse pressure lower than the pressure P2 on the opening 3 side (P1 <P2), the fluid flows from the opening 3 side as indicated by the arrow b. It flows to the opening 5 side.

  When the rotary clamp cylinder 7 is driven from the open state shown in FIG. 1, the rod 7 a of the rotary clamp cylinder 7 and the valve body 6 bound to the lower end thereof linearly move downward in the valve body 2. As shown in FIG. 2, when the screw 6a formed on the outer periphery of the valve body 6 contacts the screw 2a formed on the inner periphery of the valve body 2, the rotary clamp cylinder 7 is interposed via the rod 7a. In order to linearly move the valve body 6 downward while rotating, the screw 6a formed on the outer periphery of the valve body 6 and the screw 2a formed on the inner periphery of the valve body 2 are screwed as shown in FIG. Match. Accordingly, the valve body 6 moves downward along the screw 2a while rotating in the direction of the arrow as shown in FIG. 3, and is seated on the valve seat 4 as shown in FIG. When closed, the drive of the rotary clamp cylinder 7 is stopped and the on-off valve 1 is closed to prevent the fluid from flowing. As described above, the moving stroke per rotation of the rod 7a of the rotary clamp cylinder 7 is equal to the pitch of the screw 6a formed on the outer periphery of the valve body 6 and the screw 2a formed on the inner periphery of the valve body 2. Therefore, the rotation and linear movement of the valve body 6 are smoothly performed without resistance.

  Thus, when the opening 3 of the valve body 2 is closed by the valve body 6 as described above, the pressure P1 on the opening 5 side is a positive pressure higher than the pressure P2 on the opening 3 side (P1). > P2), the pressure difference ΔP (= P1-P2) between the pressures P1 and P2 acts on the upper surface of the valve body 6 to press the valve body 6 in the closing direction. Lifting from 4 does not occur.

  On the other hand, when the pressure P1 on the opening 5 side is lower than the pressure P2 on the opening 3 side (P1 <P2), the pressure difference ΔP ′ (= P2) between the pressures P1 and P2. −P1) acts on the lower surface of the valve body 6, and this differential pressure ΔP ′ acts on the valve body 6 to push and open the valve body 6, but in this embodiment, the opening 3 of the valve body 2 In the state closed by the valve body 6, the valve body 6 is screwed to the valve body 2 by screws 6a, 2a. Therefore, the differential pressure ΔP ′ ( Even if = P2-P1) acts on the lower surface of the valve body 6, since the opening 3 is reliably closed by the valve body 6, fluid leakage is completely prevented.

  Then, when the rotary clamp cylinder 7 is driven and the valve body 6 in the closed state is reversely rotated as shown in FIG. 4, the screwing of the valve body 6 to the valve body 2 is released, and the valve body 6 When the screw 6a is separated from the screw 2a of the valve body 2 and the valve body 6 is moved upward and pulled away from the valve seat 4, the opening 3 of the valve body 2 is opened as shown in FIG. Thus, the on-off valve 1 is opened, and fluid can flow.

  As described above, according to the on-off valve 1 according to the present embodiment, the valve body 6 is rotated while the screw 6a on the valve body 6 side is screwed with the screw 2a on the valve body 2 side, and the valve body 6 is rotated. Since the opening 3 of the valve body 2 is opened and closed by the valve body 6, the valve body 6 is screwed to the valve body 2 when the opening 3 of the valve body 2 is closed by the valve body 6. Even when a reverse pressure is applied to the valve body 6 in the closed state to push it open, the opening 3 is securely closed by the valve body 6 so that fluid leakage is completely prevented. It is.

  Further, in the present embodiment, since the rotary clamp cylinder 7 that performs the linear motion and the rotational motion of the valve body 6 in combination is used as the actuator for driving the valve body 6, the opening and closing valve 1 is automatically opened and closed. be able to.

  Although the present invention has been described with respect to an embodiment in which the present invention is applied to an open / close valve that is automatically opened and closed by an actuator, the present invention is naturally applicable to an open / close valve that is manually opened and closed. is there.

DESCRIPTION OF SYMBOLS 1 On-off valve 2 Valve body 2a Valve body screw 3 Valve body opening 4 Valve seat 5 Valve body opening 6 Valve body 6a Valve body screw 7 Rotary clamp cylinder (actuator)
7a Rotary clamp cylinder rod

Claims (2)

In the opening and closing valve that opens and closes the opening that opens in the valve body by a valve body that moves in the valve body,
A screw is engraved on the outer peripheral surface of the valve body, and a screw is selectively engraved on the inner peripheral surface in the vicinity of the opening of the valve body to a screw engraved on the outer peripheral surface of the valve body. An on-off valve is provided, wherein the opening of the valve body is opened and closed by the valve body by rotating the valve body in a state where the screw on the valve body side is screwed with the screw on the valve body side.   As the actuator for driving the valve body, a rotary clamp cylinder that performs a linear motion and a rotational motion of the valve body in combination is used, and a screw formed on the outer periphery of the valve body and an inner periphery of the valve body are formed. 2. The opening and closing according to claim 1, wherein when the screw is screwed, the valve body is linearly moved while rotating, and when both screws are unscrewed, the valve body is linearly moved. valve.

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