JP2012246955A - Valve - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a valve having less risk of fluid leaking to the outside.SOLUTION: The valve 100 includes a valve casing 110 formed with a flow passage inside, a valve element 120 arranged in the flow passage of the valve casing 110, a valve seat 111 by which the valve element 120 is caught together, and a pressing bar 130 pressing and moving the valve element 120 to open and close the flow passage. At least a part of the pressing bar 130 has a screw thread in the outer peripheral surface. The inner peripheral surface of the valve casing 110 has a screw groove of a diameter larger than the diameter of the screw thread. The pressing bar 130 is screwed to the screw groove in a manner of allowing eccentricity. By moving the valve casing 110 in circular motion around the flow passage direction as an axis, the pressing bar 130 rotates on its axis, linearly moves in the flow passage direction and presses the valve element.

Description

  The present invention relates to a valve.

  Generally, the flow path of a valve is opened and closed by a valve body installed inside the valve. Patent Document 1 discloses a so-called gate valve in which a valve body is moved from outside using a valve rod penetrating the valve.

Japanese Patent Application Laid-Open No. 07-110072

  A valve as shown in Patent Document 1 has a hole for passing a valve stem through the wall of the valve body. The gap between the valve stem and the hole is sealed by packing. However, when the fluid is a deleterious substance, poisonous substance, strong corrosive fluid, or fluid having a large temperature change, the normal packing cannot cope with it, and the fluid may leak.

  This invention is made | formed in view of the said problem, and it aims at providing the valve | membrane with a small possibility that a fluid leaks outside.

In order to achieve the above object, the valve of the present invention comprises:
A valve box having a channel formed therein;
A valve element disposed in the flow path of the valve box;
A valve body locking portion for locking the valve body;
A push rod that is disposed in the flow path of the valve box and opens and closes the flow path by pushing and moving the valve body;
There is a thread on the outer peripheral surface of at least a part of the push rod,
A thread groove having a diameter larger than the diameter of the thread on the inner peripheral surface of the valve box;
The push rod is screwed into the screw groove so as to be eccentric, and the valve box is circularly moved around the flow path direction, so that the push bar rotates and moves directly in the flow path direction to push the valve body.
It is characterized by that.

The valve body is a sphere disposed in the flow path of the valve box,
The push rod may open the flow path of the valve box by pushing the sphere and separating the sphere from the valve body locking portion.

  You may have the fluid passage which allows a fluid to pass through the inside of the said push rod.

  You may provide the push rod latching | locking part which controls the movement to the downstream direction more than the predetermined of the said push rod in the downstream of the flow path of the said valve box.

A vibration generator for supplying vibration directly or indirectly to the valve box,
The valve box may be moved circularly by vibration supplied directly or indirectly from the vibration generator.

  According to the valve of the present invention, since there is no hole in the outer wall of the valve, it is possible to provide a valve that is less likely to leak fluid.

It is sectional drawing of the valve | bulb concerning embodiment of this invention. It is a figure for demonstrating the structure of the valve box with which the valve | bulb shown in FIG. 1 is provided, (A) is a perspective view of a valve seat, (B) is sectional drawing of a stopper. It is a figure for demonstrating the structure of the push rod with which the valve | bulb shown in FIG. 1 is provided, (A) is a side view of a push rod, (B) is sectional drawing of each part of a push rod. It is a figure for demonstrating the relationship between the external thread part of a push rod, and the internal thread part of a valve box, (A) is a figure for demonstrating the relationship between the thread of a external thread part, and the thread groove of an internal thread part. (B) is a figure which shows the state in which the external thread part is eccentrically screwed with respect to the internal thread part. It is a figure which shows a mode that the vibration accompanying circular motion is given to a valve | bulb, (A) is a figure which shows a mode that the vibration transmission plate which installed the vibration motor in the valve was fixed, (B) is a figure which vibrates a vibration motor. (C) is a figure which shows a mode that a valve | bulb moves circularly. It is a figure for demonstrating a mode that a push rod rotates within a valve box, (A) is a figure which shows a mode that a female screw part carries out a circular motion, (B) is accompanying a female screw part carrying out a circular motion. It is a figure for demonstrating that a push rod rotates. It is a figure for demonstrating opening and closing operation | movement of a valve | bulb, (A) is a figure which shows a mode that a push rod moves toward an upstream, (B) is a figure which shows a mode that a push rod presses a valve body, (C) is a figure which shows a mode that a push rod moves toward a downstream. It is a figure for demonstrating the opening-and-closing operation | movement of the valve | bulb which concerns on other embodiment, (A) is a figure which shows a mode that a push rod presses a valve body, (B) is a mode that a push rod moves toward a downstream. FIG. It is a figure which shows the structure of the valve | bulb used in the Example. It is a figure which shows the valve | bulb actually used in the Example. It is a figure which shows the experimental apparatus used in the Example. It is a figure which shows the experimental result of an Example.

A valve according to an embodiment of the present invention will be described with reference to the drawings.
The valve 100 is a device for opening and closing a passage for a fluid such as gas or liquid (hereinafter referred to as “flow path”). As shown in FIG. 1, the valve box 110, the valve body 120, and the push rod 130. And.

  The valve box 110 is formed of a cylindrical body having openings at both ends and a hollow inside. Pipes, rubber hoses and the like are connected to the openings at both ends of the valve box 110, and fluid flows inside. As shown in FIG. 1, the valve box 110 includes a valve seat 111, a female screw portion 112, and a stopper 113 inside a cylinder that serves as a flow path. In the following description, it is assumed that the fluid flows in the direction of the dashed arrow shown in FIG. 1, and the direction indicated by the arrow is expressed as “downstream” and the opposite is expressed as “upstream”.

  The valve seat 111 is a part for seating and holding the valve body 120. As shown in FIG. 2A, the valve seat 111 has an inverted truncated cone shape (so-called “mortar shape”) whose diameter is reduced toward the downstream side. Yes.

  The female threaded portion 112 is a portion in which a spiral thread groove is formed on the inner wall of the valve box 110, and is disposed downstream of the valve seat 111 as shown in FIG.

  The stopper 113 is a protrusion that protrudes from the inner wall of the valve box 110 toward the center of the flow path. The stopper 113 is disposed further downstream of the female screw portion 112. As shown in FIG. 2B, the stopper 113 is disposed, for example, at four locations in the upper, lower, left, and right sides in the flow path. The distance D between the protrusions is smaller than the diameter of the head 133 of the push rod 130.

  The valve body 120 is a spherical valve composed of, for example, a metal sphere. The diameter of the valve body 120 is configured to be larger than the smallest inner diameter of the valve seat 111. As shown in FIG. 1, the valve body 120 moves downstream by the force of fluid flow and sits on the valve seat 111, and closes the flow path by the pressure of the fluid.

  The push rod 130 is a metal screw that is screwed into the female screw portion 112. As shown in FIG. 3A, the push rod 130 includes a distal end portion 131, a male screw portion 132, and a head portion 133. As shown in FIG. 1 and FIG. 3B, a fluid passage that allows fluid to pass through is formed inside the push rod 130. Further, an introduction port communicating with the fluid passage is formed on the side surface of the distal end portion 131 of the push rod 130. As shown in FIG. 1, the fluid that has entered through the valve seat 111 flows downstream through the inlet and the fluid passage.

  The thread pitch P of the male thread portion 132 is equal to the pitch P of the thread groove of the female thread portion 112, as shown in FIG. Further, as shown in FIG. 4A, the thread diameter r of the male thread part 132 is smaller than the thread groove diameter R1 of the female thread part 112 and larger than the thread diameter R2 of the female thread part 112. Therefore, the central axis of the male screw portion 132 can be eccentric with respect to the central axis of the female screw portion 112 as shown in FIG. Further, the thread diameter r of the male thread part 132 is larger than the thread diameter R2 of the female thread part 112. For this reason, even when the amount of eccentricity of the central axis of the male screw portion 132 with respect to the central axis of the female screw portion 112 becomes zero, the male screw portion 132 does not come out of the female screw portion 112.

  Next, the operation of the valve 100 having such a configuration will be described.

  First, as shown in FIG. 5A, the vibration transmission member 210 is provided with a valve box 110 of the valve 100 and a motor 220 as a vibration generator.

  The vibration transmission member 210 plays a role of transmitting vibration due to the rotational drive of the motor 220 to the valve 100. The vibration transmission member 210 is, for example, plate-shaped and is made of a material that can efficiently transmit vibration from the motor 220 to the valve 100 such as metal or hard resin. The vibration transmission member 210 is provided with a valve 221 and a shaft 221 of the motor 220 penetrating each other.

  The shaft 221 is installed in parallel to the longitudinal direction of the valve 100, that is, the axial direction of the push rod 130.

  The shaft 221 is attached to the hole of the vibration transmission member 210 so as to be rotatable with respect to the vibration transmission member 210. Further, as shown in FIG. 5B, a weight 222 having a biased center of gravity is installed on the shaft 221 of the motor 220.

  When the motor 220 is driven, the shaft 221 rotates. As shown in FIG. 5B, when the shaft 221 rotates, since the valve 100 and the shaft 221 are attached to the vibration transmission member 210, the rotation about the shaft 221 is restricted, so that vibration transmission is performed. The member 210 makes a circular motion while maintaining its orientation, that is, without rotating. Since the shaft 221 is provided with a weight 222 having a biased center of gravity, large energy is supplied by causing the vibration transmitting member 210 to perform a circular motion.

  This circular motion of the vibration transmitting member 210 is also transmitted to the valve box 110 of the valve 100. Therefore, as shown in FIG. 5C, like the vibration transmitting member 210, the valve box 110 also moves circularly about the central axis of the valve 100 while maintaining its orientation.

  Since the internal thread portion 112 is provided inside the valve box 110, the internal thread portion 112 also starts circular motion as in the valve box 110 as shown in FIG. Then, as shown in FIG. 6B, the push rod 130 installed inside the valve box 110 makes a round along the inner circumference of the female screw portion 112, for example, as a revolving motion of the earth.

  At this time, the push rod 130 slightly rotates with respect to the female screw portion 112. Because the outer periphery l of the thread of the male screw portion 132 is smaller than the inner periphery L of the screw groove of the female screw portion 112, when the female screw portion 112 goes around once and returns to the original position, FIG. This is because, as shown in (9) shown in B), the male screw portion 132 is displaced from the original position by the circumferential difference L−1. Since this is the same as rotating the screw with a screwdriver or the like, the push rod 130 moves slightly in the axial direction by the rotated angle θ.

  When vibration is continuously applied to the valve box 110, the push rod 130 moves upstream as shown in FIG. Eventually, the push rod 130 comes into contact with the valve body 120, but when the vibration is further applied, the push rod 130 starts to press the valve body 120. The valve body 120 is separated from the valve seat 111 by the pressing force from the push rod 130 as shown in FIG.

  When the valve body 120 is disengaged from the valve seat 111, the blocked fluid starts to flow downstream. As shown in FIG. 7B, the fluid enters the fluid passage from the inlet of the push rod 130 and eventually flows downstream of the valve.

  On the other hand, when closing the valve 100, the motor 220 may be driven to rotate in the opposite direction. By rotating the motor 220 in the reverse direction, the vibration transmitting member 210 and the valve box 110 move circularly in the reverse direction. That is, when the motor 220 is rotated reversely from the state shown in FIG. 7B, the push rod 130 starts reverse rotation. If the vibration is continuously applied, the push rod 130 gradually moves downstream, and eventually leaves the valve body 120. As shown in FIG. 7C, the valve body 120 is seated again on the valve seat 111 by the pressure of the fluid. When the push rod 130 reaches the stopper 113, the push rod 130 stops moving downstream.

  According to this embodiment, the valve body 120 can be moved in a state where the valve 100 is completely sealed. Therefore, since it is not necessary to make a hole in the valve 100, the risk of fluid leakage can be reduced as compared with a valve using a conventional valve stem. As a result, poisonous, deleterious substances, strong corrosive, and fluids with large temperature changes can be handled safely.

  The shape of the valve body 120 is not limited to a sphere. For example, a truncated cone may be used in accordance with the shape of the valve seat 111.

  Further, in the above, the valve body 120, the valve seat 111, and the push rod 130 are disposed in order from the upstream to the downstream, and the valve body 120 is locked to the valve seat 111 by the force of the fluid flow, and reverses the fluid flow. Although the push rod 130 pushed the valve body 120 in the direction to open the flow path has been described, the present invention is not limited to this.

  For example, as shown to FIG. 8 (A) and FIG. 8 (B), the form by which the valve seat 111, the valve body 120, and the push rod 130 are arrange | positioned toward the downstream from upstream may be sufficient. As shown in FIG. 8A, by moving the push rod 130 upstream, the valve body 120 is pressed against the valve seat 111 to close the flow path. On the other hand, by moving the push rod 130 toward the downstream, the valve body 120 is detached from the valve seat 111, and the flow path is opened.

  It was verified whether the valve could be opened and closed with a screw. The configuration of the valve used in this example is shown in FIG. The fluid flows from the left side to the right side. A hole in the truncated cone is opened in the valve body (main body), and the ball is closed by being pushed and blocked by the pressure applied to the hole from the left side. Further, the valve box has a female screw, and a male screw having a slightly smaller diameter meshes with the female screw. By vibrating the valve box, the male screw pushes the ball, and the ball comes out of the hole of the truncated cone. Since the male screw has a T-shaped hole, fluid flows through the hole and the valve is opened. This mechanism is driven by applying vibrations that are 90 ° out of phase in the y-axis direction with respect to the x-axis, but the male screw reverses when the polarity of the phase shift is reversed. Therefore, the valve can be closed or opened. Also, vibrations that are 90 ° out of phase can be generated by a motor with a weight or the like.

  The manufactured valve is shown in FIG. The valve box has a shape such as a circle, the diameter is 6 mm, the length is 32.1 mm, and the female screw is M4 coarse. The male screw also uses an M4 coarse mesh, but it is shaped slightly thin by adjusting the die, and the diameter measured at the tip of the crest is 3.91 mm. The masses of the valve box, male screw, and sphere are 0.5 g, 2.0 g, and 0.3 g, respectively, and the total is 2.8 g. The materials are MC nylon, brass, and SUS440, respectively. Although not shown in FIG. 9, the vibrator that generates vibration by rotating a weight by a motor has a cylindrical shape, a mass of 20.1 g, a diameter of 10 mm, and a length of 54 mm.

  It was verified whether the valve could be opened and closed when the air pressure was 0.2 MPa. The experimental apparatus is shown in FIG. As shown in FIG. 11, the valve was installed so that the air jet injected to the aluminum plate might hit. When the valve is opened, the aluminum plate bends slightly in the direction of (a) due to the air jet. Therefore, the open / closed state of the valve was monitored by measuring this deflection with a laser displacement meter. The motor of the vibrator was controlled by multiplying the difference between the displacement measured by the laser displacement meter and the command value by a proportional gain and controlling the rotation speed. In addition, a laser displacement meter is provided for measuring the amplitude of vibration by the vibrator. FIG. 12 shows the deflection of the aluminum plate and the amplitude of the vibration exciter when it is instructed to cause a deflection of 0.2 mm on the aluminum plate every second. Deflection occurs according to the command value, and it can be seen that the manufactured valve can be opened and closed.

  It can be used in various pipes that handle fluids with poisonous, deleterious, strong corrosive, and large temperature changes, including valves for water pipes.

DESCRIPTION OF SYMBOLS 100 Valve 110 Valve box 111 Valve seat 112 Female screw part 113 Stopper 120 Valve body 130 Push rod 131 Tip part 132 Male screw part 133 Head 210 Vibration transmission member 220 Motor 221 Shaft 222 Weight

Claims (5)

A valve box having a channel formed therein;
A valve element disposed in the flow path of the valve box;
A valve body locking portion for locking the valve body;
A push rod that is disposed in the flow path of the valve box and opens and closes the flow path by pushing and moving the valve body;
There is a thread on the outer peripheral surface of at least a part of the push rod,
A thread groove having a diameter larger than the diameter of the thread on the inner peripheral surface of the valve box;
The push rod is screwed into the screw groove so as to be eccentric, and the valve box is circularly moved around the flow path direction, so that the push bar rotates and moves directly in the flow path direction to push the valve body.
A valve characterized by that. The valve body is a sphere disposed in the flow path of the valve box,
The push rod opens the flow path of the valve box by pushing the sphere and separating the sphere from the valve body locking portion.
The valve according to claim 1. A fluid passage for allowing fluid to pass inside the push rod;
The valve according to claim 1 or 2, wherein Provided with a push rod locking portion that restricts the movement of the push rod in the downstream direction beyond a predetermined value on the downstream side of the flow path of the valve box,
The valve according to any one of claims 1 to 3, wherein: A vibration generator for supplying vibration directly or indirectly to the valve box,
The valve box moves circularly by vibrations supplied directly or indirectly from the vibration generator,
The valve according to any one of claims 1 to 4, wherein