JP2536856Y2 - Solenoid valve - Google Patents

Description

[Detailed description of the invention] [Industrial application field] The present invention relates to an electromagnetic valve, and particularly has an emergency cylinder, and in the event of an electrical system failure, moves the moving core by the cylinder to restore the function. The present invention relates to an electromagnetic valve adapted to be used.

[Outline of the invention]

An emergency cylinder to which an operating pressure is applied through an emergency port is provided on a housing of an electromagnetic valve, and a chamber to which an operating pressure for forcibly moving a moving core in the event of failure of an electric system is applied through the emergency port. The opposite chamber is communicated with a drain port so that opening / closing operation is performed even when the electric system fails, and dust is prevented from entering the opposite chamber of the cylinder. is there.

[Conventional technology]

The electromagnetic valve is configured to open and close by moving the moving core by electromagnetic force. For example, by exciting the coil, the moving core is moved against the return spring, the valve element provided on the moving core is separated from the valve seat, the import and the feed port are communicated, and the exhaust port is connected. It is closed. When the electromagnetic coil is demagnetized, the moving core is moved in the opposite direction by the return spring, and the valve body is seated on the valve seat,
As a result, communication between the import and the feed port is cut off, and the exhaust port is opened.

[Problems to be solved by the invention]

Therefore, in such an electromagnetic valve, when the electric system including the coil fails, the moving core does not move, so that the electromagnetic valve loses its function and cannot perform a predetermined opening / closing operation.

Therefore, when such an electromagnetic valve is combined with an emergency cylinder, an operating pressure is applied to a chamber communicating with the emergency port. On the other hand, a return spring is built in the opposite chamber, and the air in this chamber must be sucked and exhausted in accordance with the movement of the piston. However, depending on the use conditions, there is a possibility that dust may enter inside through such small holes for sucking and discharging air, or water may accumulate.

The present invention has been made in view of such a problem, and it is possible to maintain the function even when the electric system fails, and to set the chamber opposite to the emergency port of the emergency cylinder. It is an object of the present invention to provide an electromagnetic valve for preventing dust and water from entering the device.

[Means for solving the problem]

In the present invention, a cup-shaped yoke whose opening is closed by a magnetic path plate is attached to one end of a housing provided with an import and a feed port, a center hole is formed, and one end of the center hole penetrates the yoke. A stationary core communicating with an exhaust port facing the outside and a moving core having a center rubber are coaxially arranged in the yoke, and a coil is wound on the outer peripheral side of the stationary core and on the inner peripheral side of the yoke. The moving core is biased so as to close the import by a first return spring interposed between the stationary core and the moving core, and the first return is performed when the coil is excited. The stationary core, wherein the moving core moves in the axial direction against a spring and communicates with the exhaust port. An electromagnetic valve that closes a center hole and communicates the import with the feed port, comprising: a cylinder having an emergency port at one end and attached to the housing via a seat plate; A piston slidably disposed, having a piston rod at one end and being urged toward the emergency port by a second return spring; and a chamber opposite the piston to the emergency port of the cylinder. And a small hole provided in a seat plate provided at an end of the housing and communicating with a through-hole of the housing, wherein when the operating pressure is applied to the emergency port, the piston moves to the second position. And the piston rod moves the moving core against the first return spring. And the air in the chamber on the opposite side of the emergency port is exhausted to the outside through the small hole and the through hole by the drain port. The present invention relates to an electromagnetic valve that is suctioned through a hole and the small hole.

[Action]

Therefore, when operating pressure is applied through an emergency port provided at one end of a cylinder attached to the housing via a seat plate, the piston of the cylinder moves against the second return spring and the piston rod moves. The moving core is forcibly pressed and moved against the first return spring, thereby connecting the import and the feed port and shutting off the exhaust port. At this time, the air in the chamber opposite to the emergency port of the cylinder is exhausted to the outside from the drain through the small hole in the seat plate and the through hole in the housing arranged at the end of the chamber, and the piston is moved back Then, the air is sucked from the drain through the through hole and the small hole through the reverse route to that of the exhaust.

〔Example〕

FIG. 1 shows an electromagnetic valve according to a first embodiment of the present invention. The electromagnetic valve has a housing 10. The housing 10 is provided with an import 11 and a feed port 12. The two are communicated with each other via a central passage 13. Further, the lower end portion of the central passage 13 constitutes a valve seat 14. The center rubber 16 of the moving core 15 is press-fitted to the valve seat 14, so that the central passage 13 is closed.

A cylinder 18 is mounted on an upper part of the housing 10. A piston 19 is slidably disposed in the cylinder 18 and is urged upward by a return spring 20. Further, a piston rod 21 is fixed to the piston 19, and the lower end side of the rod 21 is constituted by a pressing portion 22 having a small diameter.

A flange 23 is integrally provided at the lower end of the cylinder 18, and a portion of the connection tube 24 below the flange 23 is received in a step 25 of the housing 10. An O-ring 26 is provided between the step portion 25 and the connecting cylinder 24 to perform sealing. A seat plate 27 is provided below the cylinder 18. And the piston rod so as to penetrate the seat plate 27
An O-ring 28 is disposed below the seat plate 27 and on the outer peripheral side of the rod 21. Further, a small hole 29 for exhausting air is formed in the seat plate 27. The small holes 29 communicate with the through holes 30 formed in the housing 10.

A yoke 34 having a cup shape is attached to the lower side of the housing 10. The upper opening of the yoke 34 is closed by a magnetic path plate 35. At the center of the yoke 34, a cylindrical brass sleeve 36 is provided. A bobbin 37 is fitted around the outer periphery of the sleeve 36, and a coil 38 is wound around the bobbin 37. The coil wound around the bobbin 37 is sealed by a mold resin 39.

A notch 40 is provided in a part of the outer peripheral portion of the magnetic path plate 35 that closes the upper part of the yoke 34, so that water that has fallen through the through hole 30 flows downward through the notch 40. This water is on the inner peripheral surface of the yoke 34
Through the gap between the yoke 34 and the outlet 39, the water is discharged through a drain 41 provided at the lower part of the yoke 34.

The moving core 15 slidably disposed in the brass sleeve 36 is urged upward by a return spring 42. The lower end of the spring 42 is received by a stationary core 43. The core 43 has a center hole 44 formed therein. The core 43 is connected to a connection fitting 45, and an exhaust port 46 is formed in the connection fitting 45.

In the configuration described above, when a current flows through the coil 38 to excite it, the stationary core 43, the yoke 34, the magnetic path plate
35 and the moving core 15 form a magnetic path. The moving core 15 is moved downward by magnetic force against the return spring 42 so as to fill the air gap of the magnetic path, that is, the gap between the lower end of the moving core 15 and the upper end of the stationary core 43. Therefore, the center rubber 16 of the core 15 moves away from the valve seat 14 and the lower end of the center rubber 16 closes the center hole 44 of the stationary core 43.

When the moving core 15 is moved downward in this manner,
The import 11 and the feed port 12 communicate with each other via the central passage 13, and the exhaust port 46 is closed. Accordingly, compressed air from the air source is supplied to an air cylinder (not shown) through the import 11, the central passage 13, and the feed port 12, and the air cylinder is switched to a predetermined state.

Next, when the current of the coil 38 is cut off and demagnetized, the moving core 15 moves upward by the restoring force of the return spring 42, and the upper part of the center rubber 16 is pressed against the valve seat 14 as shown in FIG. Therefore, the import 11 and the feed port 12 are shut off from each other. At the same time, by moving the moving core 15 upward, the lower end of the center rubber 16 separates from the upper end of the stationary core 43,
The feed port 12 and the exhaust port 46 are communicated. Therefore, the compressed air of the air cylinder connected to the feed port 12 is exhausted through the exhaust port 46, whereby the air cylinder is switched to the original state.

Next, the opening / closing operation when the electromagnetic valve loses its function due to an electrical reason will be described. In this case, through the emergency port 17 formed at the top of the cylinder 18, the cylinder 18
Apply air pressure inside. Then, the piston 19 moves downward against the return spring 20, and the rod 21 of the piston 19 moves.
The pressing portion 22 continuously provided on the center core 16 of the moving core 15 presses the upper portion. Accordingly, the moving core 15 is moved downward against the return spring 42, and the center rubber 16 is separated from the valve seat 14. Therefore, in this case, the import 11 and the feed port 12 are communicated with each other as in the case where the coil 38 is excited.

When the pressure applied to the emergency port 17 of the cylinder 18 is released, the piston 19 is moved upward by the return spring 20. Then, the moving core 15 is moved upward by the return spring 42, and the center rubber 16 is pressed against the valve seat 14 as shown in FIG. This will import 11 and feed port 12
And the exhaust port 46 is communicated with the feed port 12. That is, in this case, the same operation as when the coil 38 is demagnetized is performed.

Therefore, according to such an electromagnetic valve, the failure of the power supply circuit of the coil 38, the lead wire connected to the coil 38,
Alternatively, even in the case of a disconnection accident of the coil 38 itself, the moving core 15 is
In order to restore functionality. Therefore, it is possible to provide an electromagnetic valve whose operation is guaranteed even in the case of an electrical failure. It is preferable that the stroke of the piston 19 is set to be equal to or slightly larger than the stroke of the moving core 15.

If the electrical system fails in this way, the moving core 15
Return spring of cylinder 18 forcibly moving
The lower chamber in which 20 is built is a small hole 2 of the seat plate 27.
9, communicating with the outside through the through hole 30, the notch 40 of the magnetic path plate 35, the gap between the mold resin 39 and the yoke 34, and the drain port. Therefore, when the piston 19 is moved downward, the air in the lower chamber of the cylinder 18 is discharged from the drain 41 through the above passage. Further, when the operating pressure is released and the piston 19 is moved upward by the return spring 20, the air is supplied from the drain port 41 to the lower chamber through the above passage in reverse.

According to such a structure, since a long air passage is formed between the lower chamber of the emergency cylinder 18 and the drain port 41, the lower chamber of the emergency cylinder 18 is formed through the drain port 41. Garbage and water hardly enter. Especially the yoke
The narrow gap between 34 and the mold resin 39 prevents intrusion of dust. Further, the water accumulated in the lower chamber of the cylinder 18 is also discharged from the drain 41 through the above passage. Therefore, even if this electromagnetic valve is used under adverse environmental conditions, the cylinder 18 does not break down.

[Effect of the invention]

As described above, the present invention provides a cylinder having an emergency port at one end and attached to the housing via a seat plate, a slidably disposed cylinder, and a piston rod at one end. A piston which is urged toward the emergency port by a return spring, and a seat plate provided at the end of the chamber opposite to the emergency port of the cylinder with respect to the piston, and communicates with a through hole of the housing. When operating pressure is applied to the emergency port, the piston moves against the second return spring, and the piston rod moves the moving core against the first return spring. While the piston is forcibly moved, the air in the chamber on the opposite side of the emergency port is exhausted to the outside through the small hole and the through hole by the drain port, and the piston returns. Is obtained from which the water outlet is to be sucked through the through-hole and small hole.

Therefore, when an electrical failure occurs, the operating pressure is applied through the emergency port of the cylinder attached to the housing to move the piston, forcibly pressing and moving the moving core by the piston rod,
The import and the feed port can be communicated with each other, whereby the opening and closing operation of the solenoid valve can be performed.

In such an emergency operation, air is sucked and discharged from the chamber on the side opposite to the emergency port of the cylinder through the small hole of the seat plate and the through hole of the housing from the drain port. Prevents cylinders with emergency ports from failing, as it prevents ingress of dirt and water into the chamber and ensures that water entering the chamber is drained through through holes and drains in the housing become able to.

[Brief description of the drawings]

FIG. 1 is a longitudinal sectional view of an electromagnetic valve according to a first embodiment of the present invention. The names of the main parts in the drawings are as follows. 10 Housing 15 Moving core 17 Emergency port 18 Cylinder 19 Piston 20 Return spring 22 Pressing part 27 Seat plate 30 Through hole 34 Yoke 35 Magnetic Road board 39 …… Mold resin 40 …… Notch 41 …… Drainage port

Continuation of the front page (56) References JP-A-1-164874 (JP, A) JP-A-62-279206 (JP, A) JP-A-4-83981 (JP, A) JP-A-54-22228 (JP, A) , U) Japanese Utility Model Showa 60-120237 (JP, U) Japanese Utility Model Showa 60-147731 (JP, U) Japanese Utility Model Showa 62-87273 (JP, U) Japanese Utility Model Showa 39-18662 (JP, Y2) 41-7966 (JP, Y2)

Claims (1)

(57) [Scope of request for utility model registration] 1. A cup-shaped yoke having an opening closed by a magnetic path plate is attached to one end of a housing provided with an import and a feed port, a center hole is formed, and one end of the center hole penetrates the yoke. A stationary core communicating with an exhaust port facing the outside and a moving core having a center rubber are arranged coaxially in the yoke, and a coil is disposed on the outer peripheral side of the stationary core and on the inner peripheral side of the yoke. Winding, energizing the moving core so as to close the import by a first return spring interposed between the stationary core and the moving core, and exciting the coil to produce the first The stationary core, wherein the moving core moves in the axial direction against the return spring and communicates with the exhaust port; A solenoid valve having an emergency port at one end and attached to the housing via a seat plate, wherein the cylinder has a center hole closed and communicates the import with the feed port; A piston which is provided slidably at one end and which is provided with a piston rod at one end thereof and which is pressed and urged toward the emergency port by a second return spring; Provided on a seat plate arranged at the end of the chamber,
And a small hole communicating with the through hole of the housing, and when operating pressure is applied to the emergency port, the piston moves against the second return spring, and the piston rod moves. The moving core is forcibly pressed and moved against the first return spring, and air in a chamber opposite to the emergency port is exhausted to the outside through a drain hole through the small hole and the through hole. When the piston is moved back, air is sucked from the drain port through the through hole and the small hole.