JP5936075B2 - solenoid valve - Google Patents

Description

  The present invention relates to an electromagnetic valve that is installed in the middle of a gas passage and opens and closes the gas passage.

  As a conventional electromagnetic valve of this type, there is known one composed of a manifold and a solenoid unit. The manifold is provided with an opening for opening a space formed in the middle of the gas passage upward, and a valve port for allowing gas to flow downstream from the space is formed at the back of the opening. On the other hand, the solenoid unit is attached to the upper portion of the manifold so as to close the opening.

  The solenoid unit is provided with a hollow solenoid coil, and a plunger is disposed in the hollow portion so as to be movable back and forth. A valve body that opens and closes the valve port formed in the manifold is attached to the tip of the plunger, and the valve port is closed by the valve body at the tip when the plunger moves in a direction protruding from the solenoid coil. Has been. Between the bobbin of the solenoid coil and the plunger, a guide pipe that guides the advancement and retraction of the plunger is provided, and a flange portion that extends outward is formed at the lower end of the guide pipe (see, for example, Patent Document 1). ).

  A seal mounting portion dug down by one step is provided at the periphery of the opening formed in the manifold. When the solenoid unit is mounted on the manifold, a ring-shaped seal member is set on the seal mounting portion. When the solenoid unit is mounted, the flange is compressed from above to seal the seal member between the manifold and the solenoid unit. The sealing property is secured.

JP 2010-114151 A (FIGS. 1 and 2)

  In the above conventional solenoid valve, when the solenoid is mounted on the manifold, the solenoid unit is set in the manifold with the seal member mounted in the seal mounting portion. At that time, the seal member is sealed in the seal mounting portion by twisting or the like. If the member does not maintain a normal shape, the flange portion compresses the seal member in its twisted shape, and the sealing performance cannot be ensured.

  Therefore, as a seal member, an annular bead packing having a rectangular cross section and a bead-shaped protrusion formed on the upper surface is manufactured exclusively, and when the bead packing is set on the seal mounting portion, the shape holding force of the bead packing The bead packing is not twisted.

  However, since this bead packing must be manufactured exclusively, there is a problem that the cost is increased. However, if this bead packing is simply replaced with an inexpensive general-purpose O-ring, the O-ring has low shape retainability, so that the O-ring may be twisted as described above and cannot be used.

  In view of the above problems, an object of the present invention is to provide an electromagnetic valve in which the O-ring is not twisted in the seal mounting portion even when a general-purpose O-ring is used.

In order to solve the above problems, an electromagnetic valve according to the present invention is provided with an opening for opening upward a space formed in the middle of a gas passage, and a manifold formed with a valve port for allowing gas to flow out of the space. A solenoid valve comprising a solenoid unit attached to the upper part of the manifold so as to close the opening, and a flange extending outward to a lower end of a guide pipe that guides a plunger having a valve body that opens and closes the valve port at the tip. parts are formed,-rings like seal member to the seal mount portion formed in the periphery of the opening being disposed being compressed by the flange portions in a state of attaching the solenoid unit to the manifold, solenoid in what is a seal between the unit and the manifold, the ring-shaped sealing member is an O-ring Ri, inclined surface to correct the position of the O-ring to a normal position in a state of mounting the solenoid unit to the manifold may be formed over the flange, the plunger, the valve body and the flange attached to the distal end The valve body is urged in a direction toward the valve port by a spring contracted between the flange portion and the flange portion so that an annular undulation portion for positioning the spring is located inside the inclined portion. It is formed .

  Even if twisting or the like occurs when the O-ring is set in the seal mounting portion, the twisting or the like is eliminated by correcting the position of the O-ring to the normal position by the inclined portion.

The plunger is biased in a direction toward the valve port by a spring contracted between the valve body attached to the tip and the flange portion, and performs positioning of the spring. An annular undulating portion was formed on the flange portion so as to be inside the inclined portion.

Furthermore, ridged projections of the cross-section to the flange portion triangle is formed in an annular outer surface of the projection is the inclined portion, it is possible to the inner surface so that a said undulations.

  As is clear from the above description, the present invention can use a general-purpose O-ring, so that the cost can be reduced as compared with the conventional one using a dedicated bead packing.

The figure which shows the structure of one embodiment of this invention Diagram showing the state where the solenoid unit is mounted on the manifold The figure which shows the state by which the O-ring was twisted in the seal mounting part

  Referring to FIG. 1, 1 is an example of a solenoid valve according to the present invention. This solenoid valve 1 has a solenoid unit 2 at the upper part and a manifold 3 at the lower part. A space 30 is formed inside the manifold 3. An inflow portion 31 into which gas flows in from the horizontal direction and an outflow portion 32 through which the inflowed gas flows out downward are communicated with the space 30. And the upper end of the outflow part 32 becomes the valve opening 33, and is opened and closed by the valve body 23 mentioned later. Therefore, as shown in the figure, if the valve port 33 is closed by the valve body 23, gas does not flow from the space 30 to the outflow portion 32, so that gas is not supplied downstream from the electromagnetic valve 1. When the valve body 23 is raised and the valve port 33 is opened, the gas in the space 30 is supplied downstream through the outflow portion 32.

  The space 30 is open upward, and a seal mounting portion 35 that is lowered by one step is formed around the opening 34. A general-purpose O-ring 4 is mounted on the seal mounting portion 35 to prevent the gas in the space 30 from leaking from the joint surface between the solenoid unit 2 and the manifold 3.

  Referring to FIG. 2, a solenoid coil 21 wound around a hollow bobbin is provided in the solenoid unit 2, and a plunger 22 that can be moved back and forth in the vertical direction is disposed at the center thereof. The valve body 23 is attached to the lower end of the plunger 22, and a spring 24 that biases the valve body 23 downward is attached to the valve body 23. Therefore, when the solenoid coil 21 is not energized, the plunger 22 is moved downward by the urging force of the spring 24 and the weight of the plunger 22, and the valve body 23 moves through the valve opening 33 shown in FIG. Stopped at the closing position. When the solenoid coil 21 is energized in that state, the plunger 22 is attracted upward by the electromagnetic force generated by the solenoid coil 21, and the valve body 33 is lifted to open the valve port 33.

  The plunger 22 is housed in the guide pipe 5. The guide pipe 5 is used to guide the vertical movement of the plunger 22 and to prevent gas leakage, and is formed by pressing a plate material made of a nonmagnetic metal such as copper.

  The guide pipe 5 includes a cylindrical portion located in the solenoid coil 21 and a flange portion 51 that spreads outward from the lower end of the cylindrical portion. The flange portion 51 is formed to compress the O-ring 4 from above to ensure sealing performance, and to prevent gas in the space 30 from flowing between the guide pipe 5 and the bobbin of the solenoid coil 21. ing.

  In the conventional solenoid valve, the flange portion 51 is merely flat, but in the present embodiment, a flange-like protrusion 52 having a triangular cross section concentrically with the cylindrical portion is formed in an annular shape. The protrusion 52 is formed by pressing a guide pipe having a conventional shape and then pressing it again. At that time, since the flange portion 51 is also pressed again, the flatness of the portion of the flange portion 51 that compresses the O-ring 4 in particular is improved. Further, since the protrusion 52 is formed, deformation due to distortion or the like of the flange portion 51 is suppressed after the second press working.

  Since the protrusion 52 has a triangular cross section, an outer slope 52a and an inner slope 52b are formed. Since the protrusion 52 is not formed in the conventional flange portion, the spring 24 is not positioned concentrically with the plunger 22. For this reason, there is a possibility that the position of the spring 24 may be shifted. However, if the position of the spring 24 is shifted, the valve body 23 cannot be uniformly pressed against the valve port 33 and the smooth advance / retreat of the plunger 22 may be hindered. there were. However, in the present invention, the spring 24 is positioned by the inner inclined surface 52b, so that the valve body 23 can be always pressed against the valve port 33 uniformly.

  Since the O-ring 4 is a general-purpose commercial product, the price is low, but it is easily deformed by twisting or the like. Therefore, when it is mounted on the seal mounting portion 35, a state that does not fit in the seal mounting portion 35 in a normal posture occurs as shown in FIG. In this state, the solenoid unit 2 is attached to the manifold 3, but it is behind the solenoid unit 2 and it is difficult to check whether the O-ring 4 is twisted. If the solenoid unit 2 is attached to the manifold 3 in a state where it is twisted, the sealing performance by the O-ring 4 is impaired.

  However, in the present embodiment, since the outer slope 52a is formed, even if the O-ring 4 is slightly twisted as shown in FIG. Can be corrected to the original normal state. For this reason, the sealing failure in the O-ring 4 does not occur.

  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.

DESCRIPTION OF SYMBOLS 1 Solenoid valve 2 Solenoid unit 3 Manifold 4 O-ring 5 Guide pipe 22 Plunger 23 Valve body 24 Spring 30 Space 33 Valve port 34 Opening 35 Seal mounting part 51 Flange part 52 Projection part 52a Outer slope 52b Inner slope

Claims (2)

A manifold in which an opening that opens the space formed in the middle of the gas passage is provided and a valve port that allows gas to flow out from the space is formed, and a solenoid unit that is attached to the upper portion of the manifold so as to close the opening. And a flange portion extending outward is formed at the lower end of a guide pipe that guides a plunger having a valve body attached to the tip for opening and closing the valve port, and formed at the periphery of the opening. and the seal mounting portion-ring-shaped sealing member, in a state of attaching the solenoid unit to the manifold are arranged is compressed by the flange portion, in what is a seal between the solenoid unit and the manifold , the ring-shaped sealing member is an O-ring, fitted with a solenoid unit to the manifold Inclined surface to correct the condition in a position normal position of O-ring, is formed on the flange portion, the plunger was provided in a compressed state between the valve body and the flange portion attached to the distal end The valve body is urged in a direction toward the valve port by a spring, and an annular undulation for positioning the spring is formed in the flange portion so as to be inside the inclined portion. solenoid valve. Ridged projections of the cross-section to the flange portion triangle is formed in an annular outer surface of the projection is the inclined portion, to claim 1 in which the inner surface, characterized in that the above-mentioned undulation The solenoid valve described.