JP3321520B2 - solenoid - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a solenoid used for, for example, a solenoid valve.

[0002]

2. Description of the Related Art A conventional solenoid of this type is, for example, a solenoid 100 used for a solenoid valve as shown in FIG.

The solenoid 100 includes a solenoid main body 101 having a hollow interior, a plunger 103 as a movable member made of a magnetic material, which is reciprocally inserted into a hollow interior of the solenoid main body 101 via a sleeve 102, and a plunger 103. A body 104 as a fixing member made of a magnetic material provided coaxially opposed thereto, a coil spring 105 as urging means for urging the plunger 103 in a direction away from the body 104, and operatively connected to the plunger 103. Rod 106.

The plunger 103 has a substantially rectangular cross section and has a through hole 103A formed through the center axis thereof.

One end of the rod 106 has a small diameter, and the small diameter portion 106A is inserted into the through hole 1 of the plunger 103.
The rod 106 is operatively connected to the plunger 103 by, for example, caulking or the like within the 03A.

The rod 106 is reciprocally inserted into a through hole 104A formed through the body 104 on the center axis. The through hole 10 of this body 104
4A is stepped, the plunger 103 side has a large diameter, and the coil spring 105 is inserted into the large diameter portion 104B.

That is, the coil spring 105 is disposed on the outer peripheral portion of the rod 106, one end of the coil spring 105 is in contact with a step surface of the through hole 104A with the large diameter portion 104B, and the other end is the plunger 1
03 and plunger 103 in contact with end surface of body 104
It is biased in the direction away from.

The solenoid 100 constructed as described above
When the solenoid body 101 is not energized, the plunger 103 moves away from the body 104 by the spring force of the coil spring 105. This allows
The rod 106 operatively connected to the plunger 103 moves upward in the figure.

When the solenoid body 101 is energized,
The plunger 103 is magnetically attracted to the body 104 side against the spring force of the coil spring 105. Thus, the rod 1 operatively connected to the plunger 103
06 moves to the lower side in the figure.

When the solenoid body 101 is de-energized and energized in this manner, the plunger 103 reciprocates, and the rod 106 operatively connected to the plunger 103 reciprocates. For example, as shown in FIG.
06 drives a steel ball 107 as a valve element provided at the tip.

[0011]

However, in the case of the above-mentioned prior art, the plunger 103 is not provided with the through hole 10.
Since the parts other than 3A are solid, the mass of the plunger 103 is large and the responsiveness of the plunger 103 is deteriorated.

In addition, since the passage allowing the flow of the fluid between both ends in the axial direction of the plunger 103 is a clearance between the outer peripheral surface of the plunger 103 and the inner peripheral surface of the sleeve 102, the movement of the plunger 103 is poor and the response is poor. I was sick.

Further, when the clearance is increased, the flow of magnetic flux to the plunger 103 decreases, and the magnetic attraction force of the solenoid 100 decreases.
The response of No. 3 was worsened.

Further, in order to make the plunger 103 have a substantially rectangular cross section, it requires time-consuming cutting, which requires a lot of man-hours for the cutting. Similarly, body 1
Since the through-hole 104A must be a large-diameter portion 104B in order to provide a portion for inserting the coil spring 105 in the portion 04, the number of steps of the cutting process is increased.

Further, the rod 106 is connected to the plunger 103.
Operatively connected to the small diameter portion 106 of the rod 106
A step of fixing (caulking) A in the through hole 103A of the plunger 103 is required.

The present invention has been made to solve the above-mentioned problems of the prior art.
It is an object of the present invention to provide a solenoid capable of improving responsiveness of a movable member and facilitating manufacture.

[0017]

According to the present invention, there is provided a solenoid body having a hollow interior,
Reciprocally inserted into the hollow interior of the solenoid body,
A movable member made of a magnetic material having a passage that allows the flow of fluid between both ends in the axial direction, a fixed member made of a magnetic material provided coaxially opposite to the movable member, and A biasing means for biasing the member away from the movable member, wherein the movable member has a substantially concave cross-sectional shape having a hole at the bottom, and a lock operatively connected to the movable member.
And the rod is substantially concave in cross section having a hole in the bottom.
When a contact part is provided to contact the inner bottom surface of the
And a communication for communicating the inside of the movable member and the hole with the corresponding contact portion.
A passage, and the communication passage and the hole constitute the passage;
2. A solenoid according to claim 1, wherein said urging means is provided between an end surface of the contact portion of said rod and an end surface of said fixing member.

[0018]

In the solenoid having the above-mentioned structure, the movable member has a substantially concave cross section, so that the inside becomes hollow,
Since the mass is reduced, the responsiveness of the movable member is improved.

Since the bottom has a hole, the flow of the fluid between both ends in the axial direction of the movable member can be permitted from the inside of the movable member through the hole, so that the passage area is large. I can take it. Further, since the clearance between the outer peripheral surface of the movable member and the inner peripheral surface of the hollow interior of the solenoid body can be reduced, the magnetic attraction force can be increased. From these, the responsiveness of the movable member can be improved.

Further, in the manufacture of the movable member, the plate-shaped member can be manufactured by a simple press working or the like which does not take much time, so that the number of processing steps requiring time can be reduced.

Further, since the urging means is provided between the inner bottom surface of the movable member having a substantially concave cross section and the end face of the fixed member, it is not necessary to machine a portion for providing the urging means on the fixed member side. . Therefore, the number of processing steps for the fixing member is reduced.

As described above, the number of processing steps for the movable member and the fixed member is reduced, so that the manufacture can be simplified as a whole.

When the rod is operatively connected to the movable member, a contact portion is provided for abutting the rod on the inner bottom surface of the movable member having the substantially concave cross section, and the urging means is connected to the end surface of the contact portion of the rod. If provided between the end faces of the fixing member,
The rod is operatively connected to the movable member via the contact portion by the urging force of the urging means. Therefore, a step for operative connection is not required, and the production can be further facilitated.

Further, since the contact portion has a communication passage for communicating the inside of the movable member with the hole formed at the bottom thereof,
A passage that allows the flow of the fluid between both ends of the movable member is secured.

[0026]

DESCRIPTION OF THE PREFERRED EMBODIMENTS The present invention will be described below based on the illustrated embodiment. In FIG. 1 showing a solenoid according to one embodiment of the present invention, reference numeral 1 denotes a solenoid used for a solenoid valve as in the prior art, and generally includes a hollow solenoid body 2 and a solenoid body 2.
A plunger 3 as a movable member made of a magnetic material, which is reciprocally inserted into the hollow inside of the hollow body, a rod 4 operatively connected to the plunger 3, and a magnetic material provided coaxially facing the plunger 3. The solenoid valve 1A includes a body 5 as a fixing member and a coil spring 6 as urging means for urging the plunger 3 away from the body 5. The solenoid valve 1A is integrated with the solenoid 1 via the body 5. And a valve body 7 provided in the main body.

The solenoid body 2 has a case 8 having both ends opened, a coil 10 wound around a bobbin 10A housed in the case 8, a coil 10 held by the case 8, and one end of an open end of the case 8. The upper plate 12 is provided to guide the magnetic path from the case 8 to the plunger 3 via the yoke member 11, and is provided at the other open end of the case 5 to guide the magnetic path from the body 5 to the case 8. And a lower plate 13.

The yoke member 11 is cylindrical and has a bobbin 10
The upper plate A is provided so as to contact the lower end surface in the figure of the upper plate 12 fixed by caulking at the opening end of the case 8 via the shim 14 via the shim 14. The inner diameter of the yoke member 11 is substantially the same as the inner diameter of the bobbin 10A, and the yoke member 11 and the bobbin 10A form the hollow portion 9 of the solenoid body 2.

A sleeve 15 having a substantially U-shaped cross section is provided on the inner peripheral surface of the hollow portion 9 and the end surface of the upper plate 12. The open end of the sleeve 15 has an outward flange 15A slightly extending radially outward, and the outward flange 15A is engaged with the step 10B on the inner peripheral portion of the bobbin 10A. It has become.

The opening on the opposite side of the upper plate 12 of the case 8 has an inward flange 81 extending radially inward, and abuts the lower end face of the inward flange 81 in the drawing. The lower plate 13 is mounted as described above.

Then, the body 5 is inserted into the hollow portion 9 through the sleeve 15 via the O-ring 21 as a seal member in a fluid-tight manner, and the step portion 51 is engaged with the hole portion 13A of the lower plate 13. Fixed at. Further, the step portion 52 of the step portion 51 on the upper end surface side of the lower plate 13 in the drawing is positioned by being in contact with the outward flange portion 15A of the sleeve 15.

The plunger 3 is reciprocally inserted into the hollow portion 9 between the upper end surface of the body 5 and the lower end surface of the upper plate 12. The plunger 3 has a substantially concave cross section, and a hole 3 formed through the bottom 31 on the center axis.
Two.

The inside 3 of the plunger 3 having a substantially concave cross section
A rod 4 penetrating into 3 is provided. This rod 4
Has an abutting portion 41 abutting on the inner bottom surface of the plunger 3, and the other end extends into a through-hole 53 formed through the center axis of the body 5. That is, the rod 4 is inserted into the through hole 53 in a reciprocating manner.

The contact part 41 of the rod 4 has an outward flange part 42 extending radially outward, and is larger than the diameter of the hole 32 of the plunger 3. The abutting portion 41 is provided with a slit 43 formed in the radial direction as a communication passage for communicating the inside 33 of the plunger 3 and the hole 32. The slit 43 is formed in the radial direction as the communication passage. However, the slit is not particularly limited to this, and a hole may be used. In other words, any hole may be used as long as it communicates with the inside of the plunger 3 and the hole 32.

The slit 43 and the hole 32 of the plunger 3
Thus, a passage 16 that allows the flow of fluid between both ends in the axial direction of the plunger 3 is formed.

The coil spring 6 is disposed between the end surface of the outward flange portion 42 of the contact portion 41 and the end surface of the body 5.
The rod 4 is operatively connected via the contact portion 41 by the spring force. In addition, the plunger 3 is urged in a direction away from the body 5 via the contact portion 41 by the spring force of the coil spring 6.

On the other hand, the diameter of the through hole 53 of the body 5 on the side opposite to the plunger 3 is large. This large diameter portion 54
A steel ball 17 as a valve body is inserted into the tip of the rod 4 extending inside so as to be able to reciprocate along the inner peripheral surface of the large diameter portion 54.

A valve seat 18 forming a valve seat is caulked and fixed coaxially to the open end of the large diameter portion 54 of the body 5. The valve seat 18 has a flow path 19 penetratingly formed on the central axis, and a valve seat surface 18 </ b> A in which the steel ball 17 comes into contact with and separates from the opening periphery of the flow path 19 on the large diameter portion 54 side.
have. The valve seat surface 18A is a tapered surface whose diameter increases toward the opening end surface in order to enhance the sealing performance.

Further, a filter 20 is attached to the opening of the flow passage 19 opposite to the valve seat surface 18A.

On the other hand, a port 55 communicating with the inside of the large diameter portion 54 is provided on the valve seat 18 side of the body 5.

As described above, the body 5 forms the valve body 7,
A valve body 7 is provided integrally with the solenoid body 2.

Here, the operation of the solenoid 1 having the above configuration will be described including the operation of the valve.

When the solenoid body 2 is not energized, the plunger 3 moves away from the body 5 via the contact portion 41 of the rod 4 by the spring force of the coil spring 6. Therefore, the rod 4 operatively connected via the contact portion 41 is moved upward in the drawing by the spring force of the coil spring 6. As a result, the steel ball 17 is moved by the fluid pressure flowing toward the large-diameter portion 54 via the flow path 19 so that the valve seat surface 18A
, And the flow path 19 is opened. Therefore, the flow path 19
Fluid flows through the large diameter portion 54 to the port 55.

When the solenoid body 2 is energized, the plunger 3 is turned into a coil by a magnetic circuit composed of a body 5, a lower plate 13, a case 8, an upper plate 12, a yoke member 11, a plunger 3, and a magnetic path to the body 5. Magnetic attraction is performed by the body 5 against the spring force of the spring 6. Therefore, the rod 4 moves downward in the figure. This movement of the rod 4 pushes the steel ball 17 to the valve seat surface 18.
A, and the flow path 19 is closed.

As described above, the plunger 3 reciprocates when the solenoid body 2 is de-energized or energized. Fluid flows as shown by arrow C in the figure as lubrication for the reciprocating movement of the plunger 3. That is, from the space between the body 5 and the plunger 3, the inside of the plunger 3, the slit 4
3, through a hole 32, to a port to the outside (not shown), and allows the flow of fluid between both ends in the axial direction of the plunger 3.

In the solenoid having the above configuration, the plunger 3 has a substantially concave cross section, so that the inside becomes hollow and the mass is reduced, so that the response of the plunger 3 can be improved.

Further, since the bottom 32 has the hole 32, the plunger 3 is inserted through the hole 32 and the slit 43.
Since the flow of the fluid between both ends in the axial direction of the plunger 3 can be permitted from the inside 33 of the inside, the passage area can be increased. Further, the outer peripheral surface of the plunger 3 and the solenoid body 2
Since the clearance can be reduced through the inner peripheral surface of the hollow portion 9 and the sleeve 15, the magnetic attraction force can be increased. From these, the response of the plunger 3 can be improved.

In the manufacture of the plunger 3, a plate-shaped member can be manufactured by a simple press working or the like which does not take a long time, so that a time-consuming processing man-hour can be reduced.

Further, the coil spring 6 is connected to the inner bottom surface of the plunger 3 via the contact portion 41 of the rod 4 and the body 5.
Since it is provided between the end faces, there is no need to process a portion for providing the coil spring 6 on the body 5 side, and the number of processing steps of the body 5 is reduced.

As described above, since the number of processing steps for the plunger 3 and the body 5 is reduced, the manufacture can be simplified as a whole.

When the rod 4 is operatively connected to the plunger 3, a contact portion 41 for contacting the rod 4 with the inner bottom surface of the plunger 3 is provided, and the coil spring 6 is connected to the end face of the contact portion 41 of the rod 4 and the body. 5, the rod 4 is operatively connected to the plunger 3 via the contact part 41 by the spring force of the coil spring 6. This eliminates the need for a operative connection process,
The production can be further facilitated.

In the above-described embodiment, an example in which the coil spring 6 is used as the urging means has been described. However, the present invention is not limited to this, and an elastic bellows may be used.

Although the body 5 as a fixing member made of a magnetic material has been described as integrally forming the valve body 7, it is not particularly required to be integrally formed. As a separate body, a solenoid is used for another valve body. It is good also as composition.

Further, the solenoid using a rod has been described as an example, but a solenoid without a rod may be used. In this case, the urging means of the movable member comes into direct contact with the inner bottom surface of the movable member.

[0055]

As described above, according to the present invention, since the movable member has a substantially concave cross section, the interior becomes hollow and the mass can be reduced, so that the responsiveness of the movable member can be improved. it can.

Also, since the bottom has a hole, the flow of fluid between both ends in the axial direction of the movable member can be allowed from the inside of the movable member through the hole, so that the passage area is large. I can take it. Further, since the clearance between the outer peripheral surface of the movable member and the inner peripheral surface of the hollow interior of the solenoid body can be reduced, the magnetic attraction force can be increased. From these, the responsiveness of the movable member can be improved.

Further, in the manufacture of the movable member, the plate-shaped member can be manufactured by a simple press working or the like which does not take much time, so that the number of processing steps which require time can be reduced.

Further, since the biasing means is provided between the inner bottom surface of the movable member having a substantially concave cross section and the end face of the fixed member, it is necessary to machine a portion for providing the biasing means on the fixed member side. Disappears. Therefore, the number of processing steps for the fixing member is reduced.

As described above, since the number of processing steps for the movable member and the fixed member is reduced, the production can be simplified as a whole.

When the rod is operatively connected to the movable member, a contact portion is provided for contacting the rod with the inner bottom surface of the movable member having a substantially concave cross section, and the urging means is connected to the end face of the rod contact portion. If provided between the end faces of the fixing member,
Since the rod is operatively connected to the movable member via the contact portion by the urging force of the urging means, a step of operatively connecting the rod is not required, thereby facilitating manufacture.

Further, since the abutting portion has a communication passage for communicating the inside of the movable member with the hole formed at the bottom thereof, a passage allowing fluid flow between both ends of the movable member is secured. The responsiveness of the movable member is not impaired.

[Brief description of the drawings]

FIG. 1 is an overall longitudinal sectional view of a solenoid valve using a solenoid according to one embodiment of the present invention.

FIG. 2 is an overall vertical sectional view of a conventional solenoid.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 Solenoid 1A Solenoid valve 2 Solenoid main body 3 Plunger (movable member) 31 Bottom part 32 Hole 33 Inside 4 Rod 41 Contact part 42 Outward flange part 43 Slit (passage) 5 Body (fixing member) 51, 52 Step part 53 Through hole 54 Large diameter portion 55 Port 6 Coil spring (biasing means) 7 Valve main body 8 Case 81 Outward flange portion 9 Hollow portion 10 Coil 10A Bobbin 10B Step portion 11 Yoke member 12 Upper plate 13 Lower plate 13A Hole 14 Shim 15 Sleeve 15A Outward flange portion 16 Passage 17 Steel ball 18 Valve seat 18A Valve seat surface 20 Filter 21 O-ring

──────────────────────────────────────────────────続 き Continued on the front page (56) References JP-A-7-301356 (JP, A) JP-A-6-14650 (JP, U) JP-A-6-40546 (JP, U) JP-A 62-301546 872 (JP, U) Table 7-503299 (JP, A) (58) Field surveyed (Int. Cl. ⁷ , DB name) F16K 31/06-31/11

Claims (1)

(57) [Claims] 1. A solenoid body having a hollow inside and a reciprocatingly inserted inside the hollow body of the solenoid body,
A movable member made of a magnetic material having a passage allowing a flow of a fluid between both ends in the axial direction; a fixed member made of a magnetic material provided coaxially opposite to the movable member; A biasing means for biasing the member in a direction to separate the member, wherein the movable member has a substantially concave cross section having a hole at the bottom , and a rod operatively connected to the movable member is provided;
Is the inside of a movable member having a substantially concave cross section having a hole at the bottom.
Provide a contact part to contact the bottom and move to the contact part
A communication passage communicating between the inside of the member and the hole;
And the hole constitute the passage, and the urging means is
A solenoid provided between an end surface of the contact portion of the pad and an end surface of the fixing member.