Classifications

• • H—ELECTRICITY
  • H01—ELECTRIC ELEMENTS
  • H01F—MAGNETS; INDUCTANCES; TRANSFORMERS; SELECTION OF MATERIALS FOR THEIR MAGNETIC PROPERTIES
  • H01F7/00—Magnets
  • H01F7/06—Electromagnets; Actuators including electromagnets
  • H01F7/08—Electromagnets; Actuators including electromagnets with armatures
  • H01F7/16—Rectilinearly-movable armatures
  • H01F7/1607—Armatures entering the winding
• • H—ELECTRICITY
  • H01—ELECTRIC ELEMENTS
  • H01F—MAGNETS; INDUCTANCES; TRANSFORMERS; SELECTION OF MATERIALS FOR THEIR MAGNETIC PROPERTIES
  • H01F41/00—Apparatus or processes specially adapted for manufacturing or assembling magnets, inductances or transformers; Apparatus or processes specially adapted for manufacturing materials characterised by their magnetic properties
  • H01F41/02—Apparatus or processes specially adapted for manufacturing or assembling magnets, inductances or transformers; Apparatus or processes specially adapted for manufacturing materials characterised by their magnetic properties for manufacturing cores, coils, or magnets
  • H01F41/0206—Manufacturing of magnetic cores by mechanical means
• • H—ELECTRICITY
  • H01—ELECTRIC ELEMENTS
  • H01F—MAGNETS; INDUCTANCES; TRANSFORMERS; SELECTION OF MATERIALS FOR THEIR MAGNETIC PROPERTIES
  • H01F7/00—Magnets
  • H01F7/06—Electromagnets; Actuators including electromagnets
  • H01F7/08—Electromagnets; Actuators including electromagnets with armatures
  • H01F7/081—Magnetic constructions
  • H01F2007/085—Yoke or polar piece between coil bobbin and armature having a gap, e.g. filled with nonmagnetic material
• • H—ELECTRICITY
  • H01—ELECTRIC ELEMENTS
  • H01F—MAGNETS; INDUCTANCES; TRANSFORMERS; SELECTION OF MATERIALS FOR THEIR MAGNETIC PROPERTIES
  • H01F7/00—Magnets
  • H01F7/06—Electromagnets; Actuators including electromagnets
  • H01F7/08—Electromagnets; Actuators including electromagnets with armatures
  • H01F7/16—Rectilinearly-movable armatures
  • H01F7/1607—Armatures entering the winding
  • H01F2007/163—Armatures entering the winding with axial bearing

Definitions

• This invention provides a valve 3 ⁇ 4 magnet which is used in a solenoid valve to perform the valve's main closing action, and more specifically, is grooved by a liquid.
• a valve body B' is attached to the base frame of a machine such as a machine tool. Attach the electromagnet A' to the valve body B' in a state in which the orientation corresponds to that of the valve body B' (for example, the position of the plug pin 54 corresponds to the position S of the receptacle 54' of the valve body B'). In the above case, the mounting of the valve body B' to the base frame of the machine.
• This conventional configuration requires at least three air vent holes 4 ⁇ as described above.
• the provision of a large number of air vent holes attached with such opening and closing valves with backings requires a large amount of cost, which raises the problem of increasing the cost of the electromagnet for the magnetic valve.
• the vibrator body, the coil body and the cap when assembling the electromagnet to the valve body, the vibrator body, the coil body and the cap can be easily assembled in order. has the advantage of
• the coil body can simply be put over the circumference of the pipe body. fixed. Therefore, there is an advantage that the labor for fixing the coil body can be omitted.
• the cap rotates as described above. Therefore, there is the following effect when removing air from the pipe body after assembly is completed. It is difficult to walk when you are there. However, by slightly turning the cap to raise the position of the air vent hole, the air remaining in the pipe body can be vented. This makes it possible to reduce the cost of electromagnets for magnetic valves by saving the extra expense required in the prior art, i.e., the need to form multiple air bleed structures for the cap. It is useful to
• the air vent hole provided in the cap communicates with the inside of the pipe body when the cap is twisted and loosened.
• the air vent hole moves to the outside of the packing, and communication with the inside of the pipe body is cut off.
• the movement of the movable iron core is stably guided by the pipe.
• the outer peripheral surface of the movable iron core is only in contact with the inner peripheral surface of the pipe body in a small area. That is, only the top surfaces of the plurality of protrusions provided on the outer peripheral surface of the movable iron core come into contact with the inner peripheral surface of the pipe body. Therefore, the frictional force of the movable iron core against the inner peripheral surface of the vibrator is extremely small. As a result, the advance and retraction of the movable core becomes IS comfort. This makes it possible to increase the speed of the movable iron core. When applied to a proportional control valve, it is possible to reduce the difference between the forward stop position and the backward stop position of the armature at a constant current value. High accuracy of movement position,
• the flexible core in the magnet of the present invention is manufactured by inserting the shaft through the hollow portion formed in the main body of the movable core and integrating the two with an adhesive.
• the outer diameter dimension of the through-hole portion is formed to correspond to the inner diameter dimension of the hollow portion.
• FIG. 1 is a longitudinal cross-sectional view of the magnet valve;
• Fig. 2 is an exploded perspective view;
• Fig. 5 is a perspective view of the movable iron core;
• Fig. 6 is an enlarged cross-sectional view taken along line VI-VI in Fig. 5;
• Fig. 9 is a perspective view showing a movable core having protrusions with different shapes;
• Fig. 11 is a diagram showing the air venting state of the example of Fig. 10,
• Fig. 12 is an enlarged cross-sectional view taken along the line X ⁇ -X ⁇ in Fig. 11, and
• Fig. 13 shows a still different embodiment of the air venting structure.
• FIG. 14 is a partial cross-sectional view, FIG. Fig.
• FIG. 15 is a vertical cross-sectional view showing a 3 ⁇ 4-magnet with a different type of movable iron core
• Fig. 16 is an exploded perspective view for explaining the manufacturing process of the movable iron core in the 3 ⁇ 4-magnet of Fig. 15
• Fig. 18 is a partial vertical cross-sectional view showing a different example of the connecting structure between the pipe body and the cap
• Fig. 19 is a perspective view showing a conventional example
• an electromagnetic valve electromagnet A is attached to a well-known valve body B to form an electromagnetic valve.
• the valve body B has a well-known structure, and includes a liquid passage 1 (also called an oil passage), a boat 2, a spool 3, a spool return spring 4, and the like.
• the spool 3 is freely movable in the left-right direction in FIG.
• a spool return spring 4 applies a return force to the spool 3 via a spring seat 5 . This is arranged on both the right and left sides of the spool 3 (only the right side is shown in the drawing), and normally keeps the spool 3 in a neutral position S as shown in FIG.
• This brazing magnet A is of a type called a tube type magnet or tube type 3 ⁇ 4 magnet.
• the electromagnet A is composed of a tube assembly C, an annular coil body D arranged around it, and a cap E for closing the opening of the tube assembly C and fixing the coil body D. There is ⁇
• the tube assembly C is composed of a pipe body 6 having a hollow portion for providing a flexible iron core inside, and a movable iron core 24 provided in the hollow portion.
• the pipe body 6 has a fixed core 7 and a pipe portion 8 integrally connected thereto.
• a mounting portion 12 is provided at one end of the fixed core 7 having a horizontal characteristic forming portion 7b. — Equipped with material forming.
• Mounting portion 12 has around it male screw 13 for screwing into valve body B and wrench hook portion U for screwing operation.
• a spacer 16 for preventing residual magnetism made of a non-magnetic material for example, non-magnetic stainless steel or yellow mesh
• the movable iron core 24 is made of a magnetic material such as pure iron or low-carbon steel.
• a pin 25 for transmitting operating force made of a non-magnetic material is attached (press-fitted or bonded). Furthermore, it is provided with liquid flow holes 24a.
• the pin 25 is passed through a through hole 7a formed in the fixed core 7 and faces the spool 3.
• Protrusions 26 provided on the outer peripheral surface of the movable iron core 24 are for reducing the frictional force with the inner peripheral surface of the pipe core 8, and are provided in a plurality of places on the outer peripheral surface in the shape of a dumpling. be.
• the top surface 26a of the projection 26 is coated with non-magnetic plating such as electroless nickel plating (90-92% nickel and 10-8 phosphorus). (the inner surface of the magnetically permeable portion 9) is small.
• the dimensions W and H of the projection 26 shown in Fig. 4 should be as follows: * The smaller the width W, the smaller the abrasion force, but the lower the durability due to abrasion.
• the height ⁇ should be formed narrowly within the range where the required durability is obtained (for example, 1 to 2 ⁇ ). However, if it is too high, the magnetic gap between the surface 24b and the inner surface of the magnetically conductive portion 9 becomes large.
• the thickness of the above plating should be set to 5 to 50 m.
• the ⁇ portion 26 may be formed on the inner surface of the rib portion 8 by turning the peripheral surface of the movable iron core 24, for example.
• the plating may be formed to have a required thickness as the convex portion 26, and the convex portion 26 may be formed by forming the convex portion 26. Of the convex portions 26, the convex portion located closest to the fixed core 7 As shown in FIG.
• 26 should preferably be provided at a position where it does not come into contact with the magnetic shielding part ⁇ ) even when the movable core 24 is closest to the fixed core 7. In that case, it is generally made of a material with low abrasion resistance.
• the protrusions 26 as described above are also provided in places as indicated by imaginary lines in FIG. may be placed in *
• the coil body 27 is constructed by winding a coil wire 29 around a bobbin 28, and a lead wire 30 is drawn out.
• 31 and 32 are provided. Both yokes 31 and 32 are magnetically connected by a yoke 33. Both of these yokes are made of a magnetic material such as 3 ⁇ 4 iron or low carbon steel. , these yokes 31 to 33 constitute an external magnetic circuit body.
• the main body 27 and the yokes 31 to 33 are integrated by a molded body 34, which also serves as a case, and is made of a well-known heat-resistant thermosetting or thermoplastic casting resin. There is. In some cases, glass powder is mixed in order to increase the mechanical strength.
• a bushing 35 for protecting the lead wire 30 is embedded in a part of the molded body 34.
• the cap E will be explained.*
• the cap E is formed in a concave shape.
• the opening at the tip of the pipe portion 8 in the pipe body 6 is closed, and has an upper peripheral wall 37 and a bottom wall 38.
• the inner peripheral surface 37a of the peripheral wall 37 is A female thread 39 is formed in the portion facing the body, and the female thread 39 is formed corresponding to the male thread 18.
• An O-ring is used for the packing 40 for liquid leakage prevention. It has a mouth.
• the external opening 41a of the air vent 41 is opened on the outer peripheral surface of the peripheral side wall 37, which may be opened on the outer surface 38a of the bottom wall 38.
• a blocking member 45 is interposed between the coil body D and the coil body pressing member 37b in the cap E.
• a wave washer is used for this.
• the bottom wall 38 has a bin 46 for manual operation. When an operating tool (for example, a hex key) is fitted into the operating tool fitting hole 46 a provided in the pin 46 and turned, the pin 46 advances and retreats toward the movable iron core 24 . can be pushed.
• an operating tool for example, a hex key
• the above-mentioned electromagnet A is constructed in a state in which the tube assembly C is covered with the coil body D from the electromagnet main body, and the cap E is connected to the tube assembly C (the valve body B is absent in Fig. 1). shipped,
• the applicant of the above electromagnet A connects it to the valve body B in the following manner (for example, in a horizontal mounting state as shown in Fig. 1).
• the valve body B is attached in advance to the base frame of a machine such as a machine tool in a predetermined orientation. Furthermore, the coil body D is separated from the tube assembly. Next, attach the tube assembly C to the valve body B.
• the male thread 13 of the mounting portion 12 of the pipe body 6 is screwed into the mounting female thread 13a of the valve body B.
• the opening of the through hole 7a which is the valve-side opening of the pipe body 6, communicates with the liquid passage 1.
• the coil body D is put on the outer peripheral side of the tube assembly C.
• the drawing direction of the lead wire 30 is adapted to the above machine.
• the cap E is connected to the tube assembly C using the connecting male screw 18 and female screw 39 as shown in FIG.
• the valve body B the liquid passage 1 is filled with liquid (generally oil controlled by a valve).
• the liquid also flows into the pipe body 6 in the tube assembly through the through holes 7a.
• the air remaining inside the pipe body 6 is removed as follows. Loosen the cap E (tighten the screws 18 and 39) so that the screws are screwed in as shown in Fig. 3.
• the packing 40 is separated from the pipe body 6, and the air vent hole 41 communicates with the inside of the pipe body 6 rather than the packing 40.
• the air vent hole 41 is positioned at the highest position. Then, the air remaining in the pipe body 6 is forced out through the air vent hole 41 by the liquid pressure applied from the valve body B. When all the air has escaped, the liquid will begin to leak from the air vent hole 41 * Then tighten the cap E (tighten the screws 18 and 39) As shown in the figure, the packing 40 is tightly interposed between the opposing portions of the pipe body 6 and the cab E. Then, the air vent hole 41 is cut off from the communication with the inner side of the packing 40. Simply, the outside is closed. (Through the connecting portion of the screws 18 and 39), the coil body D is pressed against the coil body presser 37b by the above tightening.
• the solenoid valve assembled as described above operates as follows: Via lead wire 30 The coil winding 29 is energized, and the magnetic flux generated by the coil winding 29 passes through the flexible iron core 24, the fixed iron core 7, the yokes 31, 33, 32, and the guide portion 9. , the movable iron core 24 is subjected to an attractive force directed toward the tilting of the fixed iron core 7. This attractive force causes the movable iron core 24 to move toward the fixed iron core 7 side. It is in light contact with the inner surface 8a of the pipe 8 (the top surface 26a is also called the contact surface 26a), so the movable iron core 24 moves while being guided by the inner surface 8a.
• Position S of the outer peripheral surface 24b of the movable iron core 24 moves in a stable state.
• the inner surface 8a is only in contact with the narrow surface 26a . Therefore , the moving force of the moving core 24 is transmitted to the spool 3 via the pin 25 and moves the spool 3.
• This movement of the spool 3 causes the valve to move.
• the degree of opening increases or decreases.
• FIG. 7 shows an example of the attractive force characteristics of the above-mentioned suspension magnet A.
• the diagonal lines indicate the spring load, which is the force applied to the spool 3 by the spool return spring 4. show.
• Each curve shows the attractive force applied to the armature at the indicated current.
• 0 of the stroke indicates the position of the spigot armature 24 where the armature is closest to the stationary core.
• 3M of the stroke indicates the position of the movable core 24 when the pin 25 of the movable core 24 is in contact with the spool in the neutral state.
• the current is then ramped down to say 0.8A. Then the magnetic force due to the current decreases. Therefore, the movable iron core 24 begins to retract due to the spring load.
• the frictional force is applied as a load to the retraction*, that is, the direction of the force is the same as the direction in which the magnetic force due to the current tends to move the movable iron core 24 forward. Therefore, the force applied to the movable iron core 24 in its advancing direction is the sum of the magnetic force and the frictional force. that power
• the movable core 24, indicated by the curve ⁇ moves backward until it reaches the point f (stroke 1 ⁇ 05 «) where this force and the spring load meet and stops (retraction stopping position).
• the forward stop position b and the backward stop position ⁇ of the moving iron core 24 when the same amount of current, for example, 0.8 ⁇ , is applied to the coil are very close (difference amount G1) i.e., this example With a 3 ⁇ 4 magnet, the accuracy of the position of the flexible iron core with respect to the 3 ⁇ 4 flow value to the coil is R. Therefore, the proportional control valve using this electromagnet can control the opening of the valve with high accuracy.
• the curves corresponding to the curves a and e are Ara ' and e', respectively. 1.0 w), and a large amount of difference G2 occurs between the two. That is, there is a large variation in the opening of the valve with respect to the current value to the coil.
• the electromagnet for a proportional control valve has been described above as an example.
• other electromagnets such as electromagnets in which the movable iron core changes its position between the attracting position and the released position, the movable iron core can be easily moved between the two positions with little frictional force. As a result, high-speed operation becomes possible.
• the fixation of the coil body D to the valve body B may be as shown by the imaginary line in FIG. Then, it is fitted to the screw hole 50 3 ⁇ 4 provided in the valve body B.
• the cap E does not need to press the coil body D.
• the tip of the surrounding wall 37 in the cap E is positioned, for example, at the position indicated by reference numeral 37c in FIG. Up to a is fine.
• FIGS. 8 and 9 showing different embodiments of the movable iron core will be explained.
• the protrusions 26d are locally provided at positions equally dividing the movable core in the circumferential direction.
• Each pin is formed by fixing (for example, press-fitting, hammering, or gluing) a pin into a hole 47 provided in the movable iron core 24d.
• FIGS 13 and 14 show a further different embodiment of the air vent structure.
• the air vent hole 41f is provided in an annular shape at a position facing the ring-shaped end face of the packing 40f. provided,
• FIG. 15 shows a moving magnet having a movable iron core and an air-bleeding structure of a type different from that of FIG.
• the movable core 24g in this example consists of a movable core body 61 and a shaft 62.
• the movable core body 61 is made of a magnetic material such as pure iron or low-carbon steel.
• the shaft 62 is made of non-magnetic material (for example, non-magnetic stainless steel). Further, the shaft 62 has increased surface hardness in order to increase wear resistance against sliding with the bearing.
• This shaft 62 also serves as a transmission piece for transmitting the movement of the movable core main body 61 to the spool 3g.
• the body 61 and shaft 62 are glued together. thus integrated,
• a pipe body 6g housing the movable iron core 24g has two bearings 15 and 22 that support a shaft 62 in the movable iron core 24g so as to move back and forth.
• the bearing 15 is held by the fixed core 7g, and the support 22 is held by a holder 19 attached to the front and rear portions of the pipe body 6g.
• Both bearings 15 and 22 are made of a material with low sliding resistance.
• the holder 19 also serves as a stopper for the movable iron core 24 g, and is made of a non-magnetic material.
• ring 21 is installed.
• a fixed iron core 7g in a pipe body 6g has a double structure of an inner circumference tilting element 63 and an outer circumference tilting element 64. As shown in FIG. Both are integrated by means of a press fit or clearance fit.
• a flange-like yoke portion 11 is formed across the outer peripheral element 64. The yoke portion 11 attaches the pipe body 6s to the valve body Bg. It is attached to the valve body Bg with a mounting bolt 13g.
• a female screw is formed on the inner peripheral surface of the air vent hole 41g, and the opening/closing plug 42 is screwed thereon.
• a well-known seal washer 43 is interposed between the hole of the air vent hole 41g and the head of the opening/closing plug 42 to prevent liquid from leaking from therebetween.
• the main body 61 and the shaft 62 are manufactured by lathe processing, for example.
• the main body 61 is formed with a through-hole for passing through the shaft, that is, a hollow portion 61a in the center.
• a small diameter portion 62a is formed in order to obtain an adhesion allowance 66.
• the main body 61 has an outer diameter of, for example, 18" and a length of 30 to 35 ⁇ , and the inner diameter D1 of the hollow portion 61a is, for example, 5.990".
• the outer diameter dimension D2 of the insertion portion 62b of the shaft 62 corresponds to D1. For example, it is 5.985. Therefore, the clearance between the two when the insertion portion 62b is inserted into the hollow portion 61a is about 5 (in some cases, a clearance of about 15 m is allowed).
• the bonding margin 66 has a depth of about 0.1 to 0.2 and a length of about 12.
• an adhesive 67 is applied to the small diameter portion 62 a of the shaft 62 .
• the adhesive 67 heat-curing or regular-curing adhesives are used, and anaerobic ones are preferred for the reason of improving workability. Liquid type is used. Or you can use a jelly-like one ⁇
• one end of the shaft 62 that is, a predetermined portion of the intermediate end is inserted into the hollow end 61a.
• the shaft 62 and the subject capital 61 are rotated relatively.
• the adhesive spreads evenly in the circumferential direction between the inner peripheral surface 61b of the hollow portion 61a and the outer peripheral surface 62c facing the inner peripheral surface at the through portion 62b of the shaft 62.
• the main body portion 61 and the shaft 62 are kept at rest, and the adhesive is cured. In this case, both may be held by a jig.
• a thermosetting adhesive is used, the heat is applied within a range in which the magnetic properties of the main rest portion 61 are not deteriorated and the adhesive is cured.
• the small-diameter portion 62a for forming the bonding margin is formed in order to obtain a sufficiently large bonding strength.
• the above Formation of the reduced diameter portion 62a is omitted.
• the problems of the conventional manufacturing method are solved and the following effects are obtained. That is, in one conventional method, the movable core main body and the shaft are joined by shrink fitting. In this method, since the movable iron core main body is heated, there is a problem that its magnetic characteristics are deteriorated. As another conventional method, After passing the shafts through them, a pin is driven through them in a direction perpendicular to their axis to perform the rainman's integration with the bin. However, this method had the problem that the driving of the bottle caused the axis of the main shaft to be misaligned with the shaft, and that the shaft was bent at the place where the bottle was driven. .
• the flexible core 24g is manufactured by inserting the shaft 62 into the hollow portion 61a formed in the movable core main portion 61 and integrating them with the adhesive 67.
• the adhesive 67 can be distributed evenly over the inner and outer peripheral surfaces of both very easily.
• the glaze line of the shaft 62 and the axis of the main body 61 are easily aligned, and the adhesion between the two is gently performed by the hardening of the adhesive thorns 67 .
• the movable core main body portion 61 and the shaft 62 do not undergo thermal deterioration such as the aforementioned shrink fitting, and good magnetic properties are maintained.
• the movable core main body 61 and the shaft 62 are not subjected to any mechanical deformation. Therefore, it is possible to manufacture a movable iron core with high mechanical accuracy*.
• the moving magnet having the moving core g manufactured as described above has the following features:
• the axis of the moving core main body 61 and the axis of the shaft 62 are aligned with high precision, There is almost no eccentricity of the main body 61 with respect to the shaft 62. Therefore, when the shaft 62 is supported by the glaze holders 15 and 22 with high accuracy, the main body 61 is No radial deflection. In this state, when the main body 61 receives a magnetic force and moves in the axial direction, the main body hardly receives the attractive force in the direction intersecting the line. Therefore, the frictional force between the shaft 62 and the bearings 15, 22 is small. As a result, the movable iron core 24g moves extremely smoothly.
• the adhesion of the adhesive to the inner peripheral surface of the hollow portion 61a and the outer peripheral surface of the shaft 62 is performed by inserting the shaft 62 into the hollow portion 61a and then pouring the adhesive from the end of the hollow portion. You can let them do it.
• a highly permeable liquid adhesive is suitable. *In this case, as shown in FIG.
• the adhesive 67 may be poured from the injection hole 68,
• the air venting work for the air venting structure as described above is performed as follows. First, move the air vent hole 41 g to the highest position. Next, loosen the opening/closing valve 42 at the air vent hole 41 g.] Then, when the air inside the vibrator is released and the liquid begins to leak from the air vent hole 41 g, the opening/closing valve 42 is closed, and the air vent hole 41 g is opened. close the Other operations are the same as those in FIG.
• Fig. 18 shows another example of the connecting structure of the pipe body and the cap.
• a female thread 39h is provided on the inner peripheral surface of the pipe body 6h
• a male thread 18h is provided on the outer peripheral surface of the connecting cylindrical portion 69 in the surrounding wall 37h of the cab Eg.
• the air vent hole may be formed at the position indicated by reference numeral 41h'.

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• Engineering & Computer Science (AREA)
• Power Engineering (AREA)
• Physics & Mathematics (AREA)
• Electromagnetism (AREA)
• Manufacturing & Machinery (AREA)
• Magnetically Actuated Valves (AREA)

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Citations (4)

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• 1988
  • 1988-12-01 JP JP1988156900U patent/JPH0277376U/ja active Pending
• 1989
  • 1989-11-29 WO PCT/JP1989/001203 patent/WO1990006464A1/ja not_active Application Discontinuation
  • 1989-11-29 US US07/499,446 patent/US5050840A/en not_active Expired - Lifetime
  • 1989-11-29 EP EP19890913164 patent/EP0428728A4/en not_active Withdrawn

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