JPH0514063Y2 - - Google Patents

Description

[Detailed Description of the Invention] [Industrial Application Field] The present invention relates to a solenoid valve used in industrial machinery that utilizes fluid pressure or vacuum pressure.

[Prior Art] As shown in, for example, US Pat. No. 3,510,814, a conventional electromagnetic valve includes an excitation coil, a yoke made of a magnetic material surrounding it, and a member connecting them to the valve portion. A pipe made of a non-magnetic material is inserted through the valve, and this pipe controls the position of the electromagnetic operating part when it is connected to the valve part, and also guides the movable iron core inserted into the pipe.

However, the conventional solenoid valves described above not only have an increased number of parts and require labor to assemble, but also have magnetic circuits separated by a pipe made of non-magnetic material interposed between the yoke and the movable iron core. The efficiency decreases, which hinders power saving of the electromagnetic operating section, making it difficult to downsize the electromagnetic operating section.

[Problems to be solved by the invention] The problems to be solved by the invention are to easily regulate the positions of the valve part and the electromagnetic operating part, and to reduce magnetic loss in the electromagnetic operating part to make the electromagnetic operating part small. The aim is to reduce energy consumption and save energy.

[Means for Solving the Problems] In order to solve the above problems, the present invention provides a valve portion including a plurality of ports, a passage passing between the ports, and a valve for opening and closing a valve seat in the passage; In a solenoid valve in which an electromagnetic operating section for opening and closing operations is integrally connected, substantially concentric recesses facing each other are provided in the valve section and the edge of the center hole of the bobbin in the electromagnetic operating section, so that the valve section and Cylindrical protrusions that fit into the recesses are provided on both sides of the edge of the center hole of the magnetic plate that contacts the surface facing the electromagnetic operation part and forms part of the magnetic frame. The outer circumferential surface regulates the positions of the valve portion and the electromagnetic operating portion, and the inner circumferential surface is substantially concentric with and has the same diameter as the inner circumferential surface of the center hole of the bobbin, and serves as a guide surface for the movable iron core.

[Operation] When the cylindrical protrusions provided on both sides of the edge of the center hole of the magnetic plate are inserted into the approximately concentric recesses provided on the valve part and the center hole edge of the bobbin, the outer peripheries of both cylindrical protrusions The position of the valve part and electric operation part is regulated by the surface.
At the same time, the inner peripheral surface of the cylindrical convex portion serves as a guide surface of the movable iron core.

Therefore, the pair of cylindrical protrusions can perform two functions: regulating the positions of the valve part and the electromagnetic operating part, and guiding the movable core.

In addition, magnetic resistance is reduced because there is no tube made of non-magnetic material between the magnetic plate and the movable core, and the area facing the movable core is increased by the pair of cylindrical protrusions. , a small electromagnetic operation unit allows the required ability to be demonstrated.

[Example] Hereinafter, an example of the present invention will be described based on the drawings. FIG. 1 shows a first embodiment of the present invention, in which a valve portion 1
is provided with an inflow port 2 and an outflow port 3, and a valve chamber 5 is formed by a recess 4 provided on the surface facing the electromagnetic operating section described later, and the inflow port 2 is connected to a passage inside the valve section 1. Therefore, it communicates with the opening of the valve seat 5a provided in the valve chamber 5, and the outflow port 3 communicates with the valve chamber 5 through a passage within the valve portion 1. Further, the valve portion 1 has a groove provided on the outside of the valve chamber 5, and a sealing O-ring is fitted into the groove.

On the other hand, the bobbin 7 made of a non-magnetic material around which the excitation coil 6 of the electromagnetic operation part is wound has its center hole 8 expanded in diameter to form a locking stepped portion 8a and a recessed portion 8b. An enlarged portion provided at the upper end of the fixed iron core 10 located within the center hole 8 is locked and fixed to the stepped portion 8a via a sealing ring fitted around its outer periphery.

On both sides of the annular magnetic plate 12 which is brought into contact with the surface of the bobbin 7 facing the valve part 1, the periphery of a center hole 13 having approximately the same diameter as the center hole 8 of the bobbin is provided in a direction perpendicular to the magnetic plate 12. Projecting cylindrical protrusions 13a and 13b are formed, and by fitting one of the protrusions 13a into the recess 8b of the bobbin 7, the center hole 13, that is, the cylindrical protrusion 13
The inner circumferential surfaces of a and 13b are approximately concentric with the center hole 8 of the bobbin 7, have the same diameter, and are arranged in the direction of extension thereof.

In this way, in the center hole 8 of the bobbin and the center hole 13 of the magnetic plate 12, which are arranged concentrically, the movable iron core 14 is provided with a valve member 14a at one end thereof for opening and closing the valve seat 5a. The movable core 14 is inserted using the center hole 13 as a guide, and the valve spring 15 that is interposed between the recess formed at the other end and the recess of the fixed core 10 keeps the valve member 14a constantly It is biased in the direction to close the valve seat 5a.

The cup-shaped magnetic frame 16 that covers the bobbin 7 is
The inner surface of the mouth edge is tightly fitted to the outer peripheral surface of the magnetic plate 12, and by the magnetic frame 16, the excitation coil 6, the fixed iron core 10, the movable iron core 14, the magnetic plate 12, etc., A magnetic operation section 20 is formed.

In the electromagnetic operating section 20, the cylindrical convex portion 13b of the magnetic plate 12 is inserted into the recess 4, which is a valve chamber, so that the electromagnetic operating section 20 and the valve section 1 are arranged concentrically. The valve portion 1 and the electromagnetic operation portion 20, which are arranged in the valve portion 1 and the electromagnetic operation portion 20, are integrated by appropriate means such as bolts (not shown).

FIG. 2 shows a second embodiment of the present invention, in which the magnetic plate 1
2a has the cylindrical convex portion 1 of the first embodiment on its outer periphery.
A second protrusion 17 is formed that protrudes in the same direction as 3a, and the magnetic frame 16 is fitted around the outer periphery of the second protrusion 17.

FIG. 3 shows a third embodiment of the present invention, in which the magnetic plate 1
2b has second convex portions 17 on both sides of its outer periphery.
a, 17b are formed, and the convex portion 17b is fitted into a recessed step provided on the outer periphery of the valve portion 1.

According to the magnetic plates 12a, 12b of the second and third embodiments, since the opposing area between the magnetic plates 12a, 12b and the magnetic frame 16 increases, the magnetic loss at this opposing location can be reduced.

In addition, the valve part 1 and the electromagnetic operation part 20 may have a rectangular or circular cross-sectional shape, and the magnetic plates 12, 1
2a and 12b may have a rectangular outer shape as shown in FIG. 4 or a circular outer shape as shown in FIG. 5 depending on the cross-sectional shape of the valve portion 1 and the like.

Further, cylindrical convex portions 13a, 13b and second convex portions 17, 17 provided on the magnetic plates 12, 12a, 12b.
Both a and 17b can be integrally formed with the magnetic plates 12, 12a, and 12b by press molding.

Further, as shown in FIG. 5, the cylindrical convex portion 1
When the slits 18 are formed in the protrusions 13a and 13b, it is possible to prevent the generation of eddy currents in the convex portions 13a and 13b, thereby reducing magnetic loss due to the eddy currents.

Note that the valve of the above embodiment is a two-port valve in which the recess 4 provided in the valve portion 1 serves as the valve chamber 5, but the present invention is a two-port valve in which the recess 4 also serves as the valve chamber 5, or a two-port valve. The present invention is not limited to a three-port valve in which the valve chamber 5 is formed separately from the concave portion 4, or the valve member is configured between opposing valve seats and a valve member that is seated between the valve seats and alternately opens and closes the valve seats. It is also possible to do this.
Moreover, the magnetic plates 12, 12a, 12b of the present invention are
If necessary, a thin plating layer or a coding layer made of a non-magnetic material or a weakly magnetic material may be applied to the inner surface of the center hole 13 to be wear-resistant and to prevent local adhesion.

[Effect of the invention] The solenoid valve of the invention has a pair of cylindrical protrusions that protrude from the edge of the center hole on both sides on the magnetic plate of the electromagnetic operation part, so that no other parts are required. Not only can the positions of the electromagnetic operating part and the valve part be easily regulated by the outer circumferential surfaces of the pair of cylindrical protrusions without the need for Since the parts are guided, the number of parts can be reduced, and both parts can be easily arranged appropriately, and the overall cost can be reduced.

In addition, not only are there no parts that separate the magnetic circuit, but the area facing the movable iron core is increased by the convex part of the magnetic plate, and the magnetic loss in this part is extremely reduced, so the electromagnetic operating part can be omitted. Electricity can be used to make solenoid valves smaller.

Furthermore, since the inner circumferential surface of the center hole of the bobbin is used as the guide surface of the movable iron core, wear of the movable iron core can be reduced.

[Brief explanation of the drawing]

FIG. 1 is a longitudinal sectional front view of the first embodiment of the present invention, FIGS. 2 and 3 are longitudinal sectional front views of main parts of other embodiments of the invention, and FIG. 4 is a plan view of another magnetic plate. FIG. 5 is a perspective view of yet another magnetic plate. DESCRIPTION OF SYMBOLS 1... Valve part, 2... Inflow port, 3... Outflow port, 4, 8b... Recessed part, 5a... Valve seat, 7...
Bobbin, 12, 12a, 12b...magnetic plate, 13
a, 13b...Cylindrical convex portion, 14...Movable iron core, 2
0...Electromagnetic operation section.

Claims (1)

[Scope of Claim for Utility Model Registration] A valve part that is provided with a plurality of ports, a passage that communicates between the ports, a valve that opens and closes a valve seat in the passage, and an electromagnetic operating part that opens and closes the valve are integrally connected. In the electromagnetic valve, substantially concentric recesses facing each other are provided in the valve part and the edge of the center hole of the bobbin in the electromagnetic operating part, and the recesses are in contact with the facing surfaces of the valve part and the electromagnetic operating part to generate a magnetic field. Cylindrical protrusions that fit into the recesses are provided on both sides of the edge of the center hole of the magnetic plate that constitutes a part of the frame, and the valve part and the electromagnetic operating part are connected by the outer peripheral surfaces of these cylindrical protrusions. 1. A solenoid valve characterized by regulating the position of the movable iron core, and having an inner circumferential surface substantially concentric with and having the same diameter as the inner circumferential surface of a center hole of a bobbin, and serving as a guide surface for a movable iron core.