JP3773359B2 - solenoid valve - Google Patents

Description

[0001]
BACKGROUND OF THE INVENTION
The present invention relates to an electromagnetic valve in which a solenoid is operated to cause a valve body to contact or separate from a valve seat. More specifically, the present invention relates to a solenoid valve that is suitable for controlling a pressure fluid and requires high-speed response and durability against frequent operations.
[0002]
[Prior art]
2. Description of the Related Art Conventionally, there is an electromagnetic valve in which a solenoid is operated to bring a valve element into contact with or away from a valve seat. In this type of solenoid valve, the magnitude of the movement stroke of the valve body with respect to the valve seat determines the flow rate of the fluid output from the solenoid valve.
[0003]
In order to frequently control the flow of pressure fluid at short time intervals, there is an electromagnetic valve designed in consideration of high-speed response and durability against high-frequency operation. This type of solenoid valve is made by attracting and attracting a flat valve body (metal valve body) itself to a suction surface such as a fixed iron core of a solenoid and a magnetic frame as a movable iron core, or by stopping the adsorption. The valve body is brought into contact with or separated from the valve seat. Adsorption of the metal valve element to the suction surface such as a fixed iron core or stop of the adsorption is performed by exciting and demagnetizing the solenoid to magnetize and demagnetize the metal valve element.
[0004]
However, in the solenoid valve described above, the solenoid is excited and demagnetized frequently at short intervals in order to attract and stop the metal valve body at high intervals at short intervals on the suction surface such as a fixed iron core. During demagnetization, magnetism tends to remain in the magnetized metal valve body, and the residual magnetism tends to delay the separation of the metal valve body from the attraction surface such as a fixed iron core. As a result, the contact (return) of the metal valve body with respect to the valve seat is delayed, and the high-speed response of the operation as an electromagnetic valve may be hindered.
[0005]
Therefore, in order to eliminate the above-described problems, a spacing member (including a buffer member) made of a non-magnetic material is interposed on the suction surface such as a fixed iron core or the suction surface (surface to be attracted) of the metal valve body. Thus, it is conceivable that the metal valve element is not brought into direct contact with the suction surface.
[0006]
For example, Japanese Utility Model Publication No. 5-26389 discloses one of the above solenoid valves. As shown in FIG. 20, in this solenoid valve, the coil 52 of the solenoid 51 is energized to energize the valve body 54 including the movable iron core 53 to the suction surface 55a of the fixed iron core 55, thereby opening the valve seat 56. I try to let them. The valve body 54 includes a movable iron core 53 and a buffer member 57 that covers almost the entire surface of the iron core 53. The suction surface side of the movable iron core 53 is brought into contact with the suction surface 55 a of the fixed iron core 55 via the buffer member 57.
[0007]
On the other hand, unlike the above-described prior art, there is an electromagnetic valve in which a buffer member is attached to the side of the fixed iron core or the like. In this electromagnetic valve, in order to receive a movable iron core (valve element) by a suction surface such as a fixed iron core and a buffer member, the buffer member is attached so as to be flush with the suction surface of the fixed iron core or the like.
[0008]
[Problems to be solved by the invention]
However, in the former solenoid valve, the magnetic stroke with respect to the movable iron core 53, that is, the range covered by magnetism, tends to be greatly sacrificed by the amount of the buffer member 57 provided on the attracted surface side of the movable iron core 53. It was. That is, when the moving stroke of the valve element 54 with respect to the valve seat 56 is set to a predetermined value, a magnetic force larger than the amount corresponding to the moving stroke must be generated in the coil 52, and the magnetic loss tends to increase. there were. This increases the number of turns of the coil 52 or enlarges the distance between the suction surface 55a and the valve seat 56, leading to an increase in the size of the electromagnetic valve.
[0009]
On the other hand, in the latter solenoid valve, when attaching the buffer member separately to the fixed iron core or the like, high accuracy is required to make the buffer member flush with the suction surface, and the dimensional accuracy for each part becomes strict. There was a tendency for the mounting work of the parts to be troublesome.
[0010]
The present invention has been made in view of the above circumstances, and its object is to suppress the generation of residual magnetism in the metal valve body without separately attaching a spacing member, thereby ensuring high-speed response in operation. An object of the present invention is to provide a solenoid valve that makes it possible.
[0011]
[Means for Solving the Problems]
In order to achieve the above object, the invention described in claim 1 includes a valve body portion having a metal valve body and a valve seat, and a solenoid having a magnetic frame for attracting the metal valve body. The solenoid valve is configured to control the suction of the metal valve body to the suction surface of the valve so that the metal valve body is brought into contact with or separated from the valve seat, and the bottom of the solenoid joined to the valve body portion The material is made of a non-magnetic material, the suction surface is arranged on the bottom surface of the bottom member, the suction surface of the metal valve body and the bottom surface of the bottom member are formed so as to be in contact with each other, and the suction surface and the bottom surface are in contact with each other In this case, the suction surface and the suction surface are formed so as not to contact each other.
[0012]
According to the above configuration, the attracted surface of the metal valve body and the bottom surface of the bottom member made of a nonmagnetic material are formed so as to contact each other, and when the attracted surface and the bottom surface contact each other, the attracted surface and the magnetic The suction surfaces of the frame are formed so as not to contact each other. For this reason, when the solenoid is energized, the attracted surface of the metal valve element is attracted to the attracting surface of the magnetic frame, but the attracted surface is only in contact with the bottom surface of the bottom member. There is no contact. Thereafter, when the solenoid is demagnetized, the suction of the metal valve body with respect to the suction surface is released, and the metal valve body tends to be separated from the bottom member. At this time, since the attracted surface of the metal valve body and the attracting surface of the magnetic frame are not in contact with each other, the disappearance of magnetism from the metal valve body is facilitated, and the metal valve body is difficult to be permanently magnetized. Further, in order to make the metal valve body hard to be permanently magnetized, it is not necessary to interpose a special spacing member between the metal valve body and the bottom member.
[0013]
In order to achieve the above object, a second aspect of the present invention includes a valve main body portion having a metal valve body and a valve seat, and a solenoid having a magnetic frame for attracting the metal valve body. The solenoid valve is configured to control the suction of the metal valve body to the suction surface of the valve so that the metal valve body is brought into contact with or separated from the valve seat, and the bottom of the solenoid joined to the valve body portion The material is made of a non-magnetic material, the suction surface is arranged so as to be flush with the bottom surface of the bottom member, the suction surface side of the metal valve body is formed in irregularities, and the convex surface can be contacted with the bottom surface. The intent is that the concave surface is not in contact with the suction surface when it contacts the bottom surface.
[0014]
According to said structure, the attraction | suction surface of a magnetic frame is arrange | positioned in the same plane as the bottom face of the bottom member which consists of nonmagnetic materials, and the to-be-attracted surface side of a metal valve body is formed in unevenness. The convex surface on the suction surface side of the metal valve body can be brought into contact with the bottom surface of the bottom member so that the concave surface of the metal valve body is not in contact with the suction surface of the magnetic frame when the convex surface contacts the bottom surface. I have to. For this reason, when the solenoid is energized, the attracted surface of the metal valve element is attracted to the attracting surface of the magnetic frame, but the attracted surface of the attracted surface only comes into contact with the bottom surface of the bottom member. The concave surface does not come into contact with the attracting surface of the magnetic frame. Thereafter, when the solenoid is demagnetized, the suction of the metal valve body with respect to the suction surface is released, and the metal valve body tends to be separated from the bottom member. At this time, since the concave surface of the attracted surface of the metal valve body and the attracting surface of the magnetic frame are not in contact with each other, the disappearance of magnetism from the metal valve body is facilitated, and the metal valve body is difficult to be permanently magnetized. Further, in order to make the metal valve body hard to be permanently magnetized, it is not necessary to interpose a special spacing member between the metal valve body and the bottom member.
[0015]
In order to achieve the above object, a third aspect of the present invention includes a valve main body portion having a metal valve body and a valve seat, and a solenoid having a magnetic frame for attracting the metal valve body. The solenoid valve is configured to control the suction of the metal valve body to the suction surface of the valve so that the metal valve body is brought into contact with or separated from the valve seat, and the bottom of the solenoid joined to the valve body portion The material is made of a non-magnetic material, the suction surface is disposed on the bottom surface of the bottom member, and a part of the bottom surface is formed to be more convex than the suction surface so that the convex surface of the bottom surface can contact the suction surface of the metal valve body. The purpose is to make the suction surface non-contact with the suction surface when the suction surface comes into contact with the convex surface.
[0016]
According to said structure, the attraction | suction surface of a magnetic frame is arrange | positioned at the bottom face of the bottom member which consists of nonmagnetic materials, a part of the bottom face is formed more convexly than an attraction | suction surface, and the convex surface is attracted | sucked of a metal valve body The surface can be contacted so that the surface to be suctioned is not in contact with the suction surface when the surface to be sucked contacts the convex surface. For this reason, when the solenoid is energized, the attracted surface of the metal valve element is attracted to the attracting surface of the magnetic frame, but the attracted surface only comes into contact with the convex surface of the bottom surface of the bottom member. Does not contact the attraction surface of the magnetic frame. Thereafter, when the solenoid is demagnetized, the suction of the metal valve body with respect to the suction surface is released, and the metal valve body tends to be separated from the bottom member. At this time, since the attracted surface of the metal valve body and the attracting surface of the magnetic frame are not in contact with each other, the disappearance of magnetism from the metal valve body is facilitated, and the metal valve body is difficult to be permanently magnetized. Further, in order to make the metal valve body hard to be permanently magnetized, it is not necessary to interpose a special spacing member between the metal valve body and the bottom member.
[0017]
In order to achieve the above object, according to a fourth aspect of the present invention, in the configuration of the first aspect of the present invention, the bottom member is formed of a flexible material.
[0018]
According to said structure, in addition to the effect | action of one invention of Claim 1 thru | or 3, since a bottom member has flexibility, a metal valve body is attracted | sucked by the attraction | suction surface, and one of the to-be-sucked surface | surfaces. When the part comes into contact (collision) with the bottom surface of the bottom member, the bottom member bends and the energy at the time of collision is relaxed. On the other hand, when the suction to the suction surface is released and the metal valve body is separated from the bottom member, the repulsive force of the bending of the bottom member acts on the metal valve body, and the metal valve body is easily separated from the bottom member.
[0019]
In order to achieve the above object, the invention described in claim 5 is characterized in that, in the configuration of the invention described in claim 4, an elastic member is provided on the inner surface opposite to the bottom surface of the bottom member. .
[0020]
According to said structure, in addition to the effect | action of invention of Claim 4, since an elastic member is provided in the inner surface on the opposite side to the bottom face of a bottom member, a part of to-be-sucked surface of a metal valve body is the bottom face of a bottom member. When contacting (collision), the bending of the bottom member and the elasticity of the elastic member combine to relieve the energy at the time of collision. On the other hand, when the suction to the suction surface is released and the metal valve body is separated from the bottom member, the bending repulsion force of the bottom member and the elastic repulsion force of the elastic member combine to act on the metal valve body. The body is more easily separated from the bottom member.
[0021]
DETAILED DESCRIPTION OF THE INVENTION
DESCRIPTION OF THE PREFERRED EMBODIMENTS Hereinafter, an embodiment embodying a solenoid valve of the present invention will be described in detail with reference to the drawings.
[0022]
FIG. 1 shows the equipment state of a solenoid valve 11 embodying the present invention and a manifold 12 associated therewith. The electromagnetic valve 11 is fixed to the manifold 12 with bolts 13.
[0023]
Here, the electromagnetic valve 11 according to the present embodiment operates to discharge compressed air from a nozzle (not shown) or to block the discharge, and corresponds to a high-speed response. It is. Examples of the electromagnetic valve 11 include those applied to a sorting device for sorting and removing foreign matters such as stones, mud, and defective grains contained in grains. In this sorting device, the electromagnetic valve 11 is controlled by a controller in order to blow off only the foreign matter identified by the sensor with the air discharged from the nozzle.
[0024]
The electromagnetic valve 11 includes a valve main body 14 that incorporates a valve body (described later) and a solenoid 15 that is excited to drive the valve body. The valve body 14 has a holding block 41. The solenoid 15 is covered with an insulating sealing member 16 made of epoxy resin. The insulating sealing member 16 includes a lid member 18 including the power feeding portion 17 and a main body member 19 joined integrally with the lid member 18.
[0025]
The manifold 12 has a pair of centralized air supply ports 20, an air supply passage 21 that communicates from each port 20 to the electromagnetic valve 11, and an output passage 22 that communicates with the electromagnetic valve 11. Each central air supply port 20 is supplied with compressed air from an air source such as a compressor.
[0026]
FIG. 2 shows a cross section of the electromagnetic valve 11. FIG. 3 shows a cross section taken along line 3-3 of FIG. FIG. 4 shows the upper surface of the holding block 41 taken along line 4-4 of FIG. FIG. 5 shows the bottom surface of the solenoid 15 taken along the line 5-5 in FIG. The valve body 14 and the solenoid 15 are assembled to each other by the bolt 13 inserted through the bolt holes 15a and 41a.
[0027]
As shown in FIGS. 2 and 3, the solenoid 15 is provided on the bottom side of the solenoid 15, a coil 27 covered with the lid member 18 and the body member 19, a pair of coil terminals 28 for supplying power to the coil 27, and the solenoid 15. The bottom member 43 is provided. Both coil terminals 28 pass through the lid member 18 upward in the power feeding unit 17 and project outside. The coil 27 is wound around the bobbin 29, and the bobbin 29 is supported by the magnetic frame 30. The magnetic frame 30 is assembled to the bottom member 43. At the center of the bobbin 29, a fixed iron core 40, which is a magnetic body, is provided. The bobbin 29, the magnetic frame 30, and the fixed iron core 40 are magnetized integrally. The base of the magnetic frame 30 penetrates the bottom member 43 and is exposed to the bottom surface 43 e of the bottom member 43. Each coil terminal 28 protrudes upward from the upper ends of a pair of side plates 31 provided on the bobbin 29. An end of a coil wire 27a extending from the coil 27 is wound around the base portion of each coil terminal 28 and fixed by soldering.
[0028]
As shown in FIGS. 2 and 3, the lid member 18 is molded from resin. The lid member 18 includes a bottom portion 18a, a skirt portion 18b, and a pair of pins 18c and a pair of projection portions 18d that protrude downward from the bottom portion 18a. These protrusions 18d are arranged along the width direction at the center of the lid member 18. These protrusions 18 d are for positioning the lid member 18 with respect to the coil 27. The magnetic frame 30, the coil 27, and the like, and the base of the coil terminal 28 are each covered with the main body member 19. The portion of the main body member 19 that covers the base portion of each coil terminal 28 is included in the lid member 18. A connector (not shown) attached to the power feeding unit 17 is electrically connected to the coil terminal 28 protruding from the lid member 18.
[0029]
As shown in FIGS. 2 and 3, the valve body 14 has a female screw hole 23 and a pair of air supply holes 24 provided in the center of the holding block 41. As shown in FIG. 4, the two air supply holes 24 are arranged with the female screw hole 23 interposed therebetween, and communicate with the female screw hole 23 via the valve chamber 42. Each air supply hole 24 is connected to each air supply passage 21 of the manifold 12 described above. The female screw hole 23 has a female screw 23a in the lower half of its inner periphery.
[0030]
As shown in FIGS. 2 and 3, a valve seat cylinder 25 is mounted and fixed in the female screw hole 23. The valve seat cylinder 25 has a valve seat 25a at its upper end, and has a male screw 25b at an intermediate portion of its outer periphery. In the valve chamber 42, a metal valve element 26 corresponding to the valve seat 25a is disposed so as to be able to contact and separate from the valve seat 25a, that is, to be movable in the vertical direction.
[0031]
6 shows the upper surface of the metal valve body 26, FIG. 7 shows its side surface, and FIG. 8 shows a cross section taken along line 8-8 of FIG. The metal valve body 26 is formed of a stainless steel plate. As shown in FIGS. 2 to 8, the upper surface of the metal valve body 26 is a surface to be sucked toward the bottom surface 43 e of the bottom member 43 and is formed to be uneven. The suction surface includes a concave surface 26a on both sides and a convex surface 26b located between the concave surfaces 26a. The moving direction of the metal valve element 26 and the central axis of the bobbin 29 described above are orthogonal to each other.
[0032]
9 shows the top surface of the bottom member 43, FIG. 10 shows its cross section, and FIG. 11 shows its bottom surface 43e. As shown in FIGS. 2, 3, 5, and 9 to 11, the bottom member 43 is joined to the holding block 41. The bottom member 43 has a pair of recesses 43a at positions corresponding to both the air supply holes 24, and has a plurality of introduction grooves 43b that allow the both recesses 43a to communicate with each other at positions corresponding to the valve chambers 42. The bottom member 43 has a pair of fitting holes 43c at positions sandwiching the introduction groove 43b. The base of the magnetic frame 30 described above is fitted into these fitting holes 43c. The base end surface of the magnetic frame 30 constitutes an attraction surface 30 a for causing the metal valve body 26 to exert an attraction force based on the magnetic force of the solenoid 15. These magnetic frames 30 are formed integrally with the bottom member 43 so that the attraction surface 30 a is flush with the bottom surface 43 e of the bottom member 43.
[0033]
As shown in FIGS. 2 to 11, the concave surface 26a of the suction surface of the metal valve body 26 is opposed to the both fitting holes 43c and receives a suction force by the suction surface 30a. Of the suctioned surface of the metal valve body 26, the convex surface 26b is opposed to the two fitting holes 43c and can contact the bottom surface 43e of the bottom member 43. Since the bottom surface 43e and the suction surface 30a are coplanar, the concave surface 26a and the suction surface 30a are not in contact with each other when the convex surface 26b contacts the bottom surface 43e. That is, with the above configuration, the suction surface of the metal valve body 26 and the bottom surface 43e of the bottom member 43 are formed so as to be in contact with each other, and the suction surface of the metal valve body 26 and the bottom surface 43e of the bottom member 43 are formed. The surface to be attracted and the attracting surface 30a of the magnetic frame 30 are formed so as not to contact each other when they are in contact with each other. Each introduction groove 43 b is disposed at a position corresponding to a contact surface with the convex surface 26 b of the metal valve body 26 on the bottom surface 43 e of the bottom member 43. These introduction grooves 43b are for introducing compressed air in the recesses 43a in order to separate the metal valve body 26 from the bottom surface 43e. The bottom member 43 further has bolt holes 43d corresponding to the bolts 13 at both ends thereof.
[0034]
The bottom member 43 having the above shape is formed of a resin material that is excellent in mechanical strength and metal wear resistance and has flexibility. In this embodiment, polyphenylene sulfide (PPS) is applied as the resin material. This PPS contains carbon fiber for reinforcement and fluororesin for filling, and they are mixed at a predetermined ratio.
[0035]
As shown in FIG. 3, an inner surface opposite to the bottom surface 43e of the bottom member 43 shown in FIG. 10, that is, a recess 43f on the top surface of the bottom member 43, is provided between the magnetic frame 30 and the bottom member 43 as an elastic member of the present invention. A rubber gasket 44 is provided for sealing the gap. 12 shows the upper surface of the gasket 44, FIG. 13 shows a cross section taken along line 13-13 in FIG. 12, and FIG. 14 shows a cross section taken along line 14-14 in FIG. The hole 44a of the gasket 44 is formed so as to be aligned with the fitting hole 43c of the bottom member 43, and the base of the magnetic frame 30 passes therethrough.
[0036]
Next, the operation of the electromagnetic valve 11 configured as described above will be described. 2 and 3 show a state in which power supply to the coil terminal 28 is stopped, the coil 27 is demagnetized, and the metal valve element 26 is in contact with the valve seat 25a, that is, the electromagnetic valve 11 is closed. FIG. 15 shows an enlarged view of the vicinity of the metal valve body 26 in the closed state. In this state, a predetermined gap G <b> 1 is formed between the convex surface 26 b of the metal valve body 26 and the bottom surface 43 e (contact surface) of the bottom member 43. This gap G1 corresponds to the distance that the metal valve body 26 can move from the valve seat 25a to the maximum, and means the movement stroke of the valve body 26 with respect to the valve seat 25a. In this state, the air supplied to the air supply hole 24 acts on the upper surface of the valve body 26 through the gap G <b> 1 of the valve chamber 42 from both the concave portions 43 a of the bottom member 43. As a result, the valve body 26 is urged downward and comes into contact with the valve seat 25a, the electromagnetic valve 11 is closed, and the discharge of compressed air from the nozzle is shut off.
[0037]
FIG. 16 shows an enlarged view of the vicinity of the metal valve body 26 in the valve open state. When electric power is supplied to both coil terminals 28 from the above valve closed state, the coil 27 is excited. By this excitation, a magnetic field is formed between the coil 27, the fixed iron core 40, the magnetic frame 30, and the valve body 26, and the metal valve body 26 is attracted to the attraction surface 30a of the magnetic frame 30 thereabove. Since this suction force is larger than the pressure of the air that urges the metal valve body 26 toward the valve seat 25a, the metal valve body 26 moves upward. At this time, as shown in FIG. 16, the convex surface 26b of the metal valve body 26 contacts the bottom surface 43e of the bottom member 43, but the both concave surfaces 26a do not contact the suction surface 30a. Thereby, the metal valve body 26 is separated from the valve seat 25a, and the electromagnetic valve 11 is opened. In this state, the compressed air supplied to the concentrated supply port 20 passes through the supply passage 21, the valve seat cylinder 25, and the output passage 22 and is discharged from a predetermined nozzle. As a result, in the sorting device, foreign matters in the grain are blown off by air and removed.
[0038]
Here, in the sorting apparatus, it is necessary to open and close the solenoid valve 11 at high speed and frequently in order to blow off a large number of foreign substances from a large amount of grains. Therefore, the solenoid 15 is excited and demagnetized frequently at short intervals. In this embodiment, the convex surface 26b of the metal valve body 26 only contacts the bottom surface 43e of the bottom member 43, and the concave surface 26a of the metal valve body 26 and the attraction surface 30a of the magnetic frame 30 do not contact each other. For this reason, when the solenoid 15 is demagnetized, the magnetism from the metal valve body 26 is easily lost, and the metal valve body 26 is hardly permanent magnetized.
[0039]
Further, in order to make the metal valve body 26 hard to be permanently magnetized, it is not necessary to interpose a special spacing member between the metal valve body 26 and the bottom member 43, increasing the number of parts and making the installation work troublesome. There is nothing to do. As a result, it is possible to suppress the occurrence of residual magnetism in the metal valve body 26 without separately attaching a special spacing member, so that the return operation of the metal valve body 26, that is, the high-speed response in operation of the electromagnetic valve 11. Can be secured.
[0040]
Furthermore, since the bottom member 43 is formed of a resin material that has excellent mechanical strength and metal wear resistance and is flexible, when the metal valve body 26 collides with the bottom surface 43e of the bottom member 43, the bottom member 43 43 bends and the energy at the time of a collision is relieved. On the other hand, when the suction of the metal valve body 26 to the magnetic frame 30 is released and the metal valve body 26 moves away from the bottom member 43, the repulsive force of the bending of the bottom member 43 acts on the metal valve body 26, and the metal valve body 26 is It becomes easy to separate from the bottom member 43. In this sense, the return operation of the metal valve body 26, that is, the high-speed response in operation of the electromagnetic valve 11 can be enhanced.
[0041]
Further, in this embodiment, since the rubber gasket 44 is provided on the upper surface of the bottom member 43, the gap between the magnetic frame 30 and the bottom member 43 is sealed by the gasket 44. Accordingly, air leakage at the seal portion is suppressed, and output loss from the solenoid valve 11 is suppressed. Further, since the gasket 44 is located on the inner surface opposite to the bottom surface 43e of the bottom member 43, when the metal valve body 26 collides with the bottom surface 43e of the bottom member 43, the bottom member 43 is bent and the gasket 44 is elastic. Together, the energy at the time of the collision is relaxed. On the other hand, when the suction of the metal valve body 26 to the magnetic frame 30 is released and the metal valve body 26 moves away from the bottom member 43, the bending repulsion force of the bottom member 43 and the elastic repulsion force of the gasket 44 are combined. The metal valve body 26 acts on the metal valve body 26, and the metal valve body 26 is further easily separated from the bottom member 43. In this sense, the return operation of the metal valve body 26, that is, the high-speed response in operation of the electromagnetic valve 11 can be further improved.
[0042]
For the solenoid valve 11 of this embodiment, the result of comparison with the case of using a conventional flat metal valve body with respect to the response of the discharge pressure when demagnetizing is performed in a short time after excitation is shown in FIG. Shown in the time chart. FIG. 17A shows the on / off operation of the solenoid 15, and FIG. 17B shows the change in the discharge pressure of the solenoid valve. In FIG. 17, one scale on the horizontal axis corresponds to 0.5 ms.
At time T1, the solenoid valve 11 is opened by energizing and exciting the solenoid 15, and at time T2 1.0 ms after time T1, the solenoid 15 is demagnetized and the solenoid valve 11 is closed. In FIG. 17, the curve A shows the pressure change of the electromagnetic valve 11 using the metal valve body 26 having unevenness according to the present embodiment. Curve B shows the pressure change of a solenoid valve using a flat metal valve body for control. Besides the shape of the metal valve body, the two solenoid valves have the same structure.
As shown in FIG. 17, in the curve A, the discharge pressure drops at the peak at time T3 (0.7 ms after time T2), whereas in the curve B, the discharge pressure decreases at time T4 (1. It can be seen that the peak is delayed until after 0 ms), the discharge pressure is relatively increased, and therefore the pressure drop from the peak is relatively delayed. From this, it is clear that the responsiveness of the electromagnetic valve 11 is improved by making the attracted surface of the metal valve body 26 uneven so that the attracted surface does not contact the attracted surface 30a of the magnetic frame 30. Became.
[0043]
In addition, this invention is not limited to the said embodiment, In the range which does not deviate from the meaning of invention, it can change suitably as follows.
[0044]
(1) In the above-described embodiment, the suction surface of the metal valve body 26 is formed to be uneven, and the convex surface 26b can be brought into contact with the bottom surface 43e of the bottom member 43. Was not in contact with the attraction surface 30 a of the magnetic frame 30.
On the other hand, as shown in FIGS. 18 and 19, the attracted surface of the metal valve body 26 is flat, and only the bottom surface 43 e between the fitting holes 43 c of the bottom member 43 protrudes more than the attracting surface 30 a of the magnetic frame 30. To form. The convex surface of the bottom surface 43e can be brought into contact with the suction surface of the metal valve body 26, and when the suction surface comes into contact with the convex surface of the bottom surface 43e, the suction surface is not in contact with the suction surface 30a. Good. Here, FIG. 18 shows the opened state of the electromagnetic valve 11. In this state, the metal valve body 26 is in contact with the valve seat 25 a and is separated from the bottom member 43. FIG. 19 shows a closed state of the electromagnetic valve 11. In this state, the attracted surface of the metal valve body 26 contacts the bottom surface 43 e (convex surface) of the convex portion of the bottom member 43, but does not contact the attracting surface 30 a of the magnetic frame 30. Therefore, in this case as well, in the same way as in the above-described embodiment, it is possible to suppress the occurrence of residual magnetism in the metal valve body without separately attaching a special spacing member. Sex can be secured.
[0045]
(2) In the above embodiment, the bottom member 43 is formed of a flexible material, and the rubber gasket 44 as an elastic member is provided between the bottom member 43 and the magnetic frame 30. At least one of forming with a flexible material and providing an elastic member (gasket 44) may be omitted. That is, the structure which returns the metal valve body 26 using the repulsive force of the bending of the bottom member 43 and the elastic force of the elastic member (gasket 44) is omitted, and the generation of residual magnetism in the metal valve body 26 is suppressed. Only may be adopted. Even in this case, the responsiveness of the return of the metal valve body 26 can be secured, and the high-speed responsiveness in operation of the electromagnetic valve can be secured.
[0046]
(3) In the said embodiment, although the solenoid valve of this invention was actualized to the solenoid valve 11 applied to a sorting device, it is not restricted to this, It is actualized to the solenoid valve of other uses. You can also.
[0047]
【The invention's effect】
According to the configuration of the first aspect of the present invention, the suction surface of the metal valve body and the bottom surface of the bottom member made of a nonmagnetic material are formed so as to be able to contact each other, and when they are in contact with each other, The magnetic frame is formed so as to be in non-contact with the attraction surface of the magnetic frame.
Accordingly, since the attracted surface of the metal valve body and the attracting surface of the magnetic frame do not come into contact with each other, when the solenoid is demagnetized, the magnetism from the metal valve body is easily lost, and the metal valve body is hardly permanent magnetized. Therefore, it is not necessary to interpose a spacing member between the metal valve body and the bottom member. As a result, it is possible to suppress the occurrence of residual magnetism in the metal valve body without separately attaching a spacing member, thereby exhibiting the effect that high-speed responsiveness in operation of the electromagnetic valve can be ensured.
[0048]
According to the configuration of the second aspect of the present invention, the suction surface of the magnetic frame is disposed in the same plane as the bottom surface of the bottom member made of a nonmagnetic material, and the attracted surface side of the metal valve body is formed to be uneven. The convex surface can be contacted with the bottom surface of the bottom member, and the concave surface is not in contact with the suction surface. Therefore, also by the configuration of the present invention, the same operation and effect as in claim 1 can be obtained.
[0049]
According to the configuration of the invention described in claim 3, the attraction surface of the magnetic frame is disposed on the bottom surface of the bottom member made of a nonmagnetic material, and a part of the bottom surface is formed to be more convex than the attraction surface, The suction surface of the metal valve body can be contacted, and when the suction surface contacts the convex surface, the suction surface is not in contact with the suction surface. Therefore, also by the configuration of the present invention, the same operation and effect as in claim 1 can be obtained.
[0050]
According to the configuration of the invention of claim 4, in the configuration of one of the inventions of claims 1 to 3, since the bottom member has flexibility, the metal valve body is sucked by the suction surface and When contacting (collision) the bottom surface of the material, the energy at the time of the collision is alleviated by the bending of the bottom member. On the other hand, when the suction to the suction surface is released and the metal valve body is separated from the bottom member, the repulsive force of the bending of the bottom member acts on the metal valve body, and the metal valve body is easily separated from the bottom member. As a result, in addition to the effects of one of the first to third aspects of the invention, the high-speed responsiveness in operation of the solenoid valve can be improved.
[0051]
According to the configuration of the invention described in claim 5, in the configuration of the invention of claim 4, when a part of the suction surface of the metal valve body contacts (collises) with the bottom surface of the bottom member, the bottom member is bent. When the collision of the elastic member and the elasticity of the elastic member reduces the energy at the time of collision and the suction to the suctioned surface is released and the metal valve body leaves the bottom member, the repulsive force of the bending of the bottom member and the elasticity of the elastic member In combination with the repulsive force, the metal valve body acts on the metal valve body, and the metal valve body is more easily separated from the bottom member. As a result, in addition to the effect of the invention of claim 4, the effect that the high-speed responsiveness in operation of the solenoid valve can be further improved is exhibited.
[Brief description of the drawings]
BRIEF DESCRIPTION OF DRAWINGS FIG. 1 is a side view showing a state in which an electromagnetic valve and a manifold associated therewith are partially broken, according to one embodiment.
FIG. 2 is a cross-sectional view showing a solenoid valve in the same manner.
3 is a cross-sectional view taken along line 3-3 in FIG.
4 is an end view showing the holding block taken along the line 4-4 in FIG. 2; FIG.
5 is an end view showing the solenoid taken along the line 5-5 in FIG. 2; FIG.
FIG. 6 is also a plan view showing a metal valve body.
FIG. 7 is a front view showing the metal valve body, similarly;
8 is a cross-sectional view taken along line 8-8 in FIG.
FIG. 9 is a plan view showing the bottom member.
FIG. 10 is a cross-sectional view showing the bottom member in the same manner.
FIG. 11 is a bottom view showing the bottom member in the same manner.
FIG. 12 is a plan view showing the gasket, similarly;
13 is a cross-sectional view taken along line 13-13 of FIG.
14 is a cross-sectional view taken along line 14-14 of FIG.
FIG. 15 is a cross-sectional view showing the vicinity of a metal valve body in a valve-closed state.
FIG. 16 is a cross-sectional view showing the vicinity of the metal valve body in the valve-open state.
FIG. 17 is also a time chart showing comparison of responsiveness of electromagnetic valves.
FIG. 18 is a cross-sectional view showing the vicinity of a metal valve body in a closed state according to another embodiment.
FIG. 19 is a cross-sectional view showing the vicinity of a metal valve body in a valve open state according to another embodiment.
FIG. 20 is a cross-sectional view showing a conventional solenoid valve.
[Explanation of symbols]
11 Solenoid valve 14 Valve body 15 Solenoid 25a Valve seat 26 Metal valve body 26a Concave surface 26b Convex surface 30 Magnetic frame 30a Suction surface 43 Bottom member 43e Bottom surface 44 Gasket (elastic member)

Claims (5)

A valve main body having a metal valve body and a valve seat, and a solenoid having a magnetic frame for sucking the metal valve body, and by controlling the suction of the metal valve body to the suction surface of the magnetic frame, An electromagnetic valve configured to abut or separate the metal valve body from the valve seat,
The solenoid bottom member joined to the valve body is formed of a nonmagnetic material,
Placing the suction surface on the bottom surface of the bottom member;
The suction surface of the metal valve body and the bottom surface of the bottom member are formed so as to be in contact with each other, and the suction surface and the suction surface are not in contact with each other when the suction surface and the bottom surface are in contact with each other. A solenoid valve characterized by being formed to be A valve main body having a metal valve body and a valve seat, and a solenoid having a magnetic frame for sucking the metal valve body, and by controlling the suction of the metal valve body to the suction surface of the magnetic frame, An electromagnetic valve configured to abut or separate the metal valve body from the valve seat,
The solenoid bottom member joined to the valve body is formed of a nonmagnetic material,
Arranging the suction surface to be flush with the bottom surface of the bottom member;
The suction surface side of the metal valve body is formed in a concavo-convex shape so that the convex surface can be in contact with the bottom surface, and the concave surface is not in contact with the suction surface when the convex surface contacts the bottom surface. solenoid valve. A valve main body having a metal valve body and a valve seat, and a solenoid having a magnetic frame for sucking the metal valve body, and by controlling the suction of the metal valve body to the suction surface of the magnetic frame, An electromagnetic valve configured to abut or separate the metal valve body from the valve seat,
The solenoid bottom member joined to the valve body is formed of a nonmagnetic material,
While arranging the suction surface on the bottom surface of the bottom member, forming a part of the bottom surface more convex than the suction surface,
An electromagnetic valve characterized in that the convex surface of the bottom surface can be brought into contact with the suction surface of the metal valve body, and the suction surface is not in contact with the suction surface when the suction surface comes into contact with the convex surface. . The solenoid valve according to any one of claims 1 to 3,
An electromagnetic valve characterized in that the bottom member is made of a flexible material. 5. The electromagnetic valve according to claim 4, wherein an elastic member is provided on the inner surface opposite to the bottom surface of the bottom member.

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