JP5191282B2 - Solenoid open / close valve - Google Patents

Description

  The present invention relates to an electromagnetic on-off valve that is held in a closed state by an urging means such as a spring and that is opened by an electromagnetic force of a solenoid coil.

  This type of conventional electromagnetic on-off valve is, for example, a valve body held in a closed state by a spring is lifted by an electromagnetic force generated by energizing the solenoid coil, and further energized to the solenoid coil. The valve is open.

  A direct current is applied to the solenoid coil. When the alternating current is converted into a direct current by full-wave rectification, for example, the direct current pulsates at 100 Hz or 120 Hz. Then, the plunger to which the valve element is attached vibrates in synchronization with the pulsation frequency. Since the plunger is configured to advance and retreat in the guide pipe, if the plunger is eccentric when the plunger is retracted in the pulling direction and the distance from the guide pipe decreases, the oscillating plunger contacts the guide pipe, and the plunger A loud noise sound is generated by hitting the guide pipe.

In order to prevent the generation of such noise noise, the plunger is actively decentered with the plunger retracted, and the plunger is pressed against the guide pipe so that no loud noise is generated even if the plunger vibrates. Is known (for example, see Patent Document 1).
Japanese Patent No. 373782 (FIG. 2)

  In the above conventional one, the rear end of the plunger is sandwiched between the guide pipe and the fixed magnetic pole and pressed against the guide pipe in the valve open state, so that a frictional force is generated between the guide pipe and the fixed magnetic pole and the plunger. Arise. When closing the valve, the electromagnetic force disappears by stopping energization to the solenoid coil, and the plunger is advanced only by the urging force of the spring to close the valve. If a frictional force is generated between them, there are cases where the plunger cannot be reliably moved in the valve closing direction only by the urging force.

  In order to avoid such a valve closing failure, the urging force of the spring may be increased. However, a large electromagnetic force is required when the valve is opened, which causes a disadvantage that the vibration of the plunger becomes strong. . In addition, it is conceivable to reduce the force pressing the plunger against the guide pipe, but this causes a problem that the generation of noise noise due to the vibration of the plunger cannot be sufficiently suppressed.

  Then, this invention makes it a subject to provide the electromagnetic on-off valve which can suppress reliably generation | occurrence | production of the noise sound in a valve opening state in view of said problem.

In order to solve the above-described problems, an electromagnetic on-off valve according to the present invention is provided with a cylindrical guide pipe at the center of a solenoid coil, and a plunger that is movable forward and backward in the guide pipe and a rear portion in the guide pipe. A fixed magnetic pole for restricting backward movement at a predetermined position, a valve body is provided at the front end of the plunger, and the valve body is pressed against the valve port by a biasing means for biasing the plunger in the forward direction. In the electromagnetic on-off valve that opens the valve port by closing the port and retracting the plunger to the predetermined position against the urging force of the urging means by electromagnetic force generated by energizing the solenoid coil. The plunger is positioned on the central axis of the guide pipe while the solenoid is retracted to the predetermined position and is held at the predetermined position by the electromagnetic force of the solenoid coil. Even if the current supplied to the yl plunger is vibrated by pulsating plunger as centering means for preventing the contact with the guide pipe, it is secured to one of the plunger side and the fixed magnetic pole side A buffer member that alleviates the collision of the plunger with the fixed magnetic pole and prevents the plunger and the fixed magnetic pole from coming into close contact with each other when the plunger is retracted to the predetermined position, and is in contact with the buffer member. The concave / convex engagement structure is formed on each of the two portions, and the concave / convex engagement structure is formed by one of a buffer member and a plunger or fixed magnetic pole contacting the buffer member, and a taper convex surface formed on the other. The tapered concave surface and the tapered convex surface are in contact with each other with the plunger retracted to the predetermined position. And center the plunger is characterized in that so as to prevent contact with the guide pipe.

  When the plunger is retracted and held at a predetermined position by the centering means, the plunger is positioned at a position on the central axis that does not contact the guide pipe, so a loud noise is generated even if the plunger vibrates. do not do.

  As is clear from the above description, the present invention does not press the plunger against the guide pipe as in the prior art in the valve-open state, but positions it at a position on the central axis that does not contact the guide pipe. Therefore, there is no frictional force that hinders the movement in the valve closing direction.Therefore, when energizing the solenoid coil is stopped and the plunger is moved in the valve closing direction by the biasing force, the plunger is moved in the valve closing direction with a small biasing force. Can be moved.

  Referring to FIG. 1, 1 is an example of an electromagnetic on-off valve according to the present invention. The electromagnetic opening / closing valve 1 is attached to a manifold 2 that forms a flow path, and opens and closes a valve port 21 formed in the manifold 2.

  The electromagnetic on-off valve 1 is provided with a solenoid coil 3 wound around a hollow bobbin, and a brass guide pipe 4 is mounted in the hollow portion. A plunger 5 made of a magnetic material is held in the guide pipe 4 so as to be movable back and forth. A rubber valve body 51 for opening and closing the valve port 21 is attached to the front end of the plunger 5. Further, a spring 52 is provided to urge the plunger 5 in the valve closing direction, and the valve body 51 is pressed against the valve port 21 by the urging force of the spring 52, and the valve port 21 is held in a closed state. It is configured to be.

  When the solenoid coil 3 is energized, the plunger 5 is pulled upward in the figure by the electromagnetic force generated by the solenoid coil 3. A fixed magnetic pole 6 is fixed to the upper end, which is the rear end of the guide pipe 4, and the raised end position of the plunger 5 pulled up by the electromagnetic force of the solenoid coil 3 is regulated by the fixed magnetic pole 6. That is, by continuing to energize the solenoid coil 3, the plunger 5 can be kept in the raised end position, that is, the valve open position. When the energization is stopped, the plunger 5 is lowered by the biasing force of the spring 52, and the valve body 51 Moves to the valve closing position for closing the valve port 21, and the plunger 5 is held in the valve closing position as it is.

  An elastomer cushioning member 7 was attached to the rear portion of the plunger 5. The buffer member 7 may be made of resin or rubber. Since the speed at which the plunger 5 is raised by the electromagnetic force is high, if the plunger 5 is configured to directly collide with the fixed magnetic pole 6 and stop, a loud collision sound is generated when the valve is opened. Further, when the plunger 5 comes into close contact with the fixed magnetic pole 6, when the plunger 5 or the fixed magnetic pole 6 becomes magnetized during use, the plunger 5 is attracted to the fixed magnetic pole 6 even if the energization to the solenoid coil 3 is stopped, and the valve is closed. There are cases where it does not.

  Therefore, the buffer member 7 is provided so as to prevent the above-described impact sound and ensure that a gap is secured between the plunger 5 and the fixed magnetic pole 6 in the valve-opened state and is not in close contact. In the present embodiment, the buffer member 7 is provided with the tapered convex surface 71, and the tapered concave surface 61 corresponding to the tapered convex surface 71 is provided on the fixed magnetic pole 6. FIG. 1 shows the valve closed state, and the plunger 5 is lowered, but when the solenoid coil 3 is energized and the plunger 5 is pulled up, the tapered convex surface 71 comes into contact with the tapered concave surface 61 as shown in FIG. . Thereby, the buffer member 7 is positioned concentrically with respect to the fixed magnetic pole 6. Since the buffer member 7 is held concentrically with respect to the plunger 5 and the fixed magnetic pole 6 is positioned concentrically with the guide pipe 4, the plunger 5 is positioned concentrically with respect to the guide pipe 4. .

  A direct current is applied to the solenoid coil 3, but when a pulsating direct current that is half-end rectified or full-wave rectified by a rectifying element such as a diode is applied, the plunger 5 is moved in the front-rear direction or the diametrical direction in synchronization with the pulsation cycle. However, since the plunger 5 is positioned concentrically with respect to the guide pipe 4 and a gap having the same width is secured with respect to the entire circumferential direction, the plunger 5 does not move even if the plunger 5 vibrates. 4 is not touched.

  In the embodiment shown in FIG. 1 and FIG. 2, the tapered convex surface 71 is formed on the buffer member 7 and the tapered concave surface 61 is formed on the fixed magnetic pole 6 side. However, as shown in FIG. The tapered convex surface 62 may be formed on the buffer member 7 and the tapered concave surface 72 may be formed on the buffer member 7.

  In each of the above embodiments, the buffer member is held at the rear portion of the plunger 5, but as shown in FIG. 4, an annular buffer member 7 having a tapered convex surface 73 formed on the fixed magnetic pole 6 side is attached. The plunger 5 may be positioned concentrically with respect to the guide pipe 4 by forming a tapered concave surface 53 at the end portion and bringing the tapered concave surface 53 into contact with the tapered convex surface 73 of the buffer member 7.

  Further, in each of the above embodiments, the buffer member 7 and the fixed magnetic pole 6 are interposed between the plunger 5 and the guide pipe 4 and positioned concentrically. However, as shown in FIG. Is positioned directly concentrically with respect to the taper concave surface 74 of the buffer member 7, and the taper convex surface 54 at the rear end of the plunger 5 is brought into contact with the buffer member 7 so that only the buffer member 7 is interposed between the plunger 5 and the guide pipe 4. It is also possible to configure so as to be positioned concentrically with intervening.

  In addition, this invention is not limited to an above-described form, You may add a various change in the range which does not deviate from the summary of this invention.

The figure which shows the structure of one embodiment of this invention The figure which shows the valve opening state in 1st Embodiment The figure which shows the valve opening state in 2nd Embodiment The figure which shows the valve opening state in 3rd Embodiment The figure which shows the valve opening state in 4th Embodiment

Explanation of symbols

DESCRIPTION OF SYMBOLS 1 Electromagnetic on-off valve 2 Manifold 3 Solenoid coil 4 Guide pipe 5 Plunger 6 Fixed magnetic pole 7 Buffer member 51 Valve body 52 Spring

Claims (1)

A cylindrical guide pipe is provided at the center of the solenoid coil, and a plunger that can be moved forward and backward in the guide pipe, and a fixed magnetic pole that is fixed to the rear portion of the guide pipe and restricts the rearward movement of the plunger at a predetermined position. It is generated by providing a valve body at the front end of the plunger, closing the valve opening by pressing the valve body against the valve opening by the urging means for urging the plunger in the forward direction, and energizing the solenoid coil. In an electromagnetic open / close valve that opens the valve port by retracting the plunger against the biasing force of the biasing means by electromagnetic force, the plunger retracts to the predetermined position, and the solenoid coil electromagnetic force moves to the predetermined position. In this state, the plunger is positioned on the center axis of the guide pipe, and the current flowing to the solenoid coil pulsates, causing the plunger to Even when the dynamic, as centering means for preventing the plunger contacts the guide pipe, is secured to one of the plunger side and the fixed magnetic pole side, thereby alleviating the collision with the fixed magnetic poles of the plunger A bumper engaging structure formed on each of the buffer member for preventing the plunger and the fixed magnetic pole from coming into close contact with each other in the state in which the plunger is retracted to the predetermined position, and the other end portion that is in contact with the buffer member. The concave / convex engagement structure includes a buffer member and a tapered concave surface formed on one of a plunger or a fixed magnetic pole that contacts the buffer member and a tapered convex surface formed on the other, and the plunger is retracted to the predetermined position. In this state, the tapered concave surface and the tapered convex surface contact each other to center the plunger, and the plunger contacts the guide pipe. Solenoid valve, characterized in that so as to prevent and.

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