JP2003133132A - Solenoid for solenoid valve - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a solenoid for a solenoid valve which can be produced simply and at a low cost by reducing the number of parts and by reducing process of assembly. SOLUTION: In the solenoid 3A for the solenoid valve, an end wall portion 4b is further provided with a function of a stator core by forming a pole face 4c at the end wall portion 4b of a magnetic material case 4 covering a bobbin 7 wound by a coil 6, an end face of a moving core 5 inserted into center holes 7a and 8a between the bobbin 7 and a magnetic material plate 8 is opposed to the pole face 4c and the moving core 5 is adsorbed on the end wall portion 4b by electrification operation to the coil 6.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a solenoid valve solenoid that is attached to a solenoid valve and drives a flow path switching valve member.

[0002]

2. Description of the Related Art The solenoid valve 50 previously proposed by the present applicant is
As shown in FIG. 4, the valve portion 51 is provided with a valve member (not shown) for switching the flow path therein, and a solenoid portion 52 that is connected to the valve portion 51 and drives the valve member. The valve member of the portion 51 is configured to be opened and closed by being pushed by the push rod 60.

The solenoid portion 52 is a valve portion 51.
Cylindrical magnetic body case 5 having an opening at one end for connecting
3, a bobbin 55 around which a coil 54 is wound around, a magnetic plate 59 attached to the open end side of the magnetic case 53, the magnetic plate 59 and the bobbin 55.
Fixed core 56 and movable core 58 inserted in the center hole of the
It is configured by incorporating and. The fixed iron core 56 has a flange portion 56a and an iron core portion 56b having a magnetic pole surface 56c, and the iron core portion 56b is inserted into the center holes of the magnetic plate 59 and the bobbin 55. The movable iron core 58 is slidably inserted into the center hole, and one end of the movable iron core 58 faces the magnetic pole surface 56c.
A cap 61 is press-fitted into the other end side protruding from the center hole, the cap 61 abuts on the push rod 60, and a base end portion of the cap 61 comes in contact with and separates from the magnetic plate 59. 61a is provided.

A collar portion 6 is provided on the outer circumference of the cap 61.
1b is provided, and the collar portion 61b and the magnetic plate 5 are provided.
By contracting the return spring 57 between the movable iron core 58 and the shaft 9, the movable iron core 58 is constantly urged in the direction of contacting the push rod 60, that is, in the direction of the valve portion 51.

In the solenoid valve 50 having such a structure, when the coil 54 of the solenoid portion 52 is energized, the movable iron core 58 is fixed to the fixed iron core 56 as shown in the right half of FIG.
Is attracted to the magnetic pole surface 56c of the above, and the contact portion 61a of the cap 61 comes into contact with the magnetic plate 59 and stops.
On the other hand, in the non-energized state, as shown in the left half of FIG. 4, the movable iron core 58 separates from the magnetic pole surface 56c and presses the push rod 59 by the urging force of the return spring 57 toward the valve portion 51. However, the valve member is driven in conjunction with it.

By the way, the solenoid portion 52 is provided with a fixed iron core 56 having a complicated shape composed of the flange portion 56a and the iron core portion 56b. The present inventors have found that the fixed iron core having such a complicated shape is used. Without specially
It was confirmed that a simple structure in which other members also serve as a fixed iron core can exert a sufficient magnetic attraction force to drive the movable iron core. As a result, when manufacturing the solenoid portion, it is possible to reduce the number of parts, simplify the assembly process, and suppress the manufacturing cost.

[0007]

SUMMARY OF THE INVENTION Therefore, an object of the present invention is to reduce the number of parts by simplifying the assembling process by making another member also serve as a fixed iron core, and to manufacture at a lower cost. It is to provide a solenoid for a solenoid valve that enables the above.

[0008]

In order to solve the above-mentioned problems, according to the present invention, there is provided a solenoid which is attached to an electromagnetic valve to drive a valve member for switching a flow path, the solenoid being in an axial direction. A bobbin made of a non-magnetic material having a center hole extending to the outer circumference and a coil wound around the outer circumference; a side wall portion covering the side surface of the bobbin; A magnetic body case having an end wall portion with a substantially uniform thickness covering one end surface; a central hole that is coaxial with the central hole of the bobbin and is connected to the magnetic case on the other end surface side of the bobbin. Annular magnetic plate;
A movable iron core movably accommodated in the center hole of the bobbin and the magnetic body plate; the end wall portion of the magnetic body case also serves as a fixed iron core, and the center hole of the bobbin in the end wall portion. A solenoid for a solenoid valve is provided, which has a magnetic pole surface for attracting the movable iron core in a portion covering the.

In the present invention, the side wall portion and the end wall portion of the magnetic body case can be integrally formed so that they have a uniform thickness as a whole.

Alternatively, the side wall portion and the end wall portion of the magnetic body case may be formed separately, and the thickness of the end wall portion may be made larger than the thickness of the side wall portion.

Further, the end wall portion of the magnetic body case has a flat inner surface that covers one end surface of the bobbin in the axial direction, even if the inner side surface is entirely flat.
You may provide the cylindrical recessed part fitted in this center hole.

[0012]

In the solenoid of the present invention having such a structure, since a part of the magnetic body case also serves as a fixed iron core, it is not necessary to provide a fixed iron core having a complicated shape as in the conventional case, and the solenoid is simple. The movable iron core can be driven by the fixed iron core of the configuration. As a result, in manufacturing the solenoid portion, it is possible to reduce the number of parts, simplify the assembly process, and suppress the manufacturing cost.

[0013]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS FIG. 1 shows a first embodiment of the present invention and illustrates a case where a solenoid for a solenoid valve is applied to a 3-port solenoid valve. The solenoid valve 1 has a valve portion 2 having a valve member 16 for switching a flow path, and the solenoid 3A for driving the valve member 16.

The solenoid 3A has a magnetic body case 4. The magnetic body case 4 has a cylindrical shape with one end in the axial direction opened, and has a side wall portion 4a having a substantially rectangular cross-sectional shape and a flat end wall portion that closes one end side in the axial direction of the side wall portion 4a. 4b and. These side walls 4a
And the end wall portion 4b are integrally formed and have a uniform thickness as a whole, and the end portion of the valve body 14 of the valve portion 2 is fitted to the open end portion of the magnetic body case 4. It is worn. A non-magnetic bobbin 7 having a central hole 7a extending in the axial direction and having a coil 6 wound around the outer circumference of the magnetic body case 4 and a state in which the bobbin 7 is in contact with the end surface of the bobbin 7. An annular magnetic plate 8 connected and fixed to the inner surface of the magnetic case 4 is provided, and the bobbin 7 and the central plate 7 of the magnetic plate 8 are coaxially connected to each other.
The movable iron core 5 is movably accommodated in a and 8a. Therefore, these center holes 7a and 8a form iron core holes for accommodating the movable iron core 5.

The sectional shapes of the center holes 7a and 8a of the bobbin 7 and the magnetic plate 8 and the sectional shape of the movable iron core 5 are as follows.
Both are formed in an oval shape. The concept of the ellipse includes an ellipse and a shape in which a circle is divided into two at the center and stretched to the left and right. The end wall portion 4b of the magnetic body case 4 also serves as a fixed iron core, and the movable iron core 5 is attracted to a portion of the flat inner surface of the end wall portion 4b that covers the central hole 7a of the bobbin 7. The magnetic pole surface 4c for forming is formed. Thereby, the magnetic body case 4, the magnetic body plate 8, and the movable iron core 5 form a magnetic path surrounding the bobbin 7 around which the coil 6 is wound.

The structure of the solenoid 3A described above will be described in more detail. The first end surface 7b of the bobbin 7 housed in the magnetic body case 4 at one axial end is the magnetic pole surface 4c of the inner surface of the end wall portion 4b. And abuts around the central hole 7a of the bobbin via a sealing material 9 so that the first end surface 7b of the bobbin 7 is fixed to the end wall portion 4b.
Is covered by. The outer circumference of the side surface of the coil 6 wound around the bobbin 7 is entirely covered by the side wall portion 4 a of the magnetic body case 4. However, the side wall portion 4a does not have to have a completely rectangular cross section, and may have another cross section shape such as a U-shaped cross section in which one of the four side surfaces is removed. The magnetic body plate 8 is disposed on the second end surface 7c on the other end side in the axial direction of the bobbin 7 via a sealing material 11 disposed around the central hole 7a, and the outer peripheral portion of the magnetic body plate 8 is disposed. Is fixed to the inner peripheral surface of the side wall portion 4a of the magnetic body case 4 by means such as welding. As a result, the bobbin 7 is attached to the magnetic body case 4
The core hole is fixed inside, and a continuous core hole is formed by the central hole 7a of the bobbin 7 and the central hole 8a of the magnetic plate 8.

The movable iron core 5 is slidably inserted from the magnetic plate 8 side into the iron core hole, and the first end surface 5a on the base end side of the movable iron core 5 is the inner surface of the end wall portion 4b. The second end surface 5b on the front end side of the movable iron core 5 which faces the magnetic pole surface 4c of the movable core 5 protrudes from the iron core hole. That is, the movable core 5 penetrates the center holes 7a and 8a and overlaps the entire area of the coil 6, the first end surface 5a reaches near the end wall portion 4b, and the second end surface 5b on the opposite side is centered. A cap 5c extends from the holes 7a and 8a and is fitted on the outer periphery of the second end surface 5b. The cap 5c constitutes a spring seat, and a return spring 12 is provided between the cap 5c and the magnetic plate 8. If the cap 5c is formed so as to contact the magnetic plate 8 when the movable core 5 is attracted to the magnetic pole surface 4c, it can function as a stopper when the movable core is attracted. When the attraction by the magnetic pole surface 4c is released, the movable iron core 5 is separated from the magnetic pole surface 4c by the urging force of the return spring 12 and returned to the mouth of the magnetic body case 4, that is, the valve portion 2. Be done.

In the solenoid 3A having such a structure, when the coil 6 is in the non-energized state, the movable iron core 5 is not attracted to the magnetic pole surface 4c.
Is moved forward by the urging force of the return spring 12,
A position separated from the magnetic pole surface 4c as shown in the left half of FIG.
That is, the cap 5c occupies a position separated from the magnetic plate 8, and the second end surface 5b abuts against the push rod 13 of the valve portion 2 described later to press it. On the other hand, when the coil 6 is energized, the movable iron core 5 is attracted by the magnetic pole surface 4c against the biasing force of the return spring 12 and the push rod 13 is released from the pressing force, as shown in the right half of FIG. Operates in the direction you want to. Then, at the same time when the movable core 5 is attracted to the magnetic pole surface 4c, the cap 5c also abuts the magnetic plate 8 and the movable core 5 stops.

Next, the valve section 2 will be described in detail with reference to FIG. The valve portion 2 has the above-described valve body 14, which has an input port P, an output port A, and a discharge port R, and a valve chamber 14a in which these ports communicate with each other. is doing. This valve chamber 14a
Has one end blocked by an end block 20, and a movable orifice member 15 partly supported by the end block 20 and movable in the valve chamber 14a, and a supply valve seat on the orifice member 15. The poppet type valve member 16 for opening and closing 15a is provided, and the tip end of the push rod 13 is in contact with the valve member 16.

In the orifice member 15, the supply valve seat 15a opening into the valve chamber 14a, the pipe line 15d for communicating the supply valve seat 15a with the input port P, and the fluid pressure from the input port P are provided. A first pressure receiving surface 15b and a second pressure receiving surface 15c that act in the direction of the valve member 16 and in the opposite direction.
And have. The orifice member 15 is slidably housed in the valve chamber 14a in the axial direction thereof, that is, in the direction in which the supply valve seat 15a and the valve member 16 come into contact with and separate from each other. The first pressure receiving surface 15b has a larger pressure receiving area than the second pressure receiving surface 15c on which the fluid pressure acts in the opposite direction, and the orifice member is formed by the fluid pressure acting force acting on the first pressure receiving surface 15b. 15 is a valve member 16
It is possible to move between a position close to and a position apart from each other.

Further, the valve member 16 has a discharge valve seat 14b for communicating the discharge port R with the valve chamber 14a,
It is movably arranged between the supply valve seat 15a and opens and closes both valve seats by the operation of the solenoid 3A.

Then, the valve portion 2 and the solenoid 3
A is a sealing material 18, which is obtained by crimping a caulking portion 17 provided around the mouth of the magnetic body case 4 into a groove portion 14c recessed in the valve body 14 of the valve portion 2.
They are closely attached to each other via 19.

In the solenoid valve 1 having such a structure, when the solenoid 3A is in a non-energized state, as shown in FIG.
As shown in the left half of FIG.
The valve member 16 is pressed against the supply valve seat 15a of the movable orifice member 15 via 3, and the supply valve seat 15a is closed and at the same time the discharge valve seat 14b is opened. Therefore, the output port A communicates with the exhaust port R via the valve chamber 14a and the exhaust valve seat 14b, and the output port A and the valve chamber 14a become atmospheric pressure. Further, when the fluid pressure supplied from the input port P acts on both the pressure receiving surfaces 15b and 15c of the conduit 15d, the movable orifice member 15 moves toward the valve member 16 due to the difference in their acting forces, and the supply valve The seat 15a is pressed against the valve member 16. That is, the supply valve seat 15a is moved to the valve member 16 side by pressing the valve member 16 and the movable orifice member 17 in the direction of abutting each other so that the stroke of the movable iron core at the next energization becomes small. ing.

On the other hand, when the solenoid 2 is energized, as shown in the right half of FIG. 1, the movable iron core 5 and the push rod 1
The pressing of the valve member 16 by 3 is released, and the valve member 16 opens the supply valve seat 15a and closes the discharge valve seat 14b. By doing so, the exhaust port R and the valve chamber 14a
The output port A is communicated with the input port P through the valve chamber 14a, and at the same time, the valve chamber 1 is disconnected.
Since the pressure of 4a rises, the movable orifice member 15 is pushed back in the direction away from the valve member 16, and the supply valve seat 15
a is opened wider.

Thus, in the solenoid 3, the end wall portion 4b of the magnetic body case 4 also serves as a fixed iron core,
Unlike the conventional solenoid, it is possible to easily form with a small number of members without specially providing a fixed iron core for exclusive use.

In the above embodiment, the lateral cross section of the side wall portion 4a of the magnetic body case 4 is not limited to a substantially rectangular shape, but may be various shapes such as an ellipse including an ellipse. Further, the shapes of the central holes 7a and 8a of the bobbin 7 and the magnetic plate 8 and the movable iron core 5
The cross-sectional shape of is not limited to the above-mentioned oval shape, and may be a circular shape.

FIG. 2 shows a second embodiment of the present invention only for a solenoid for a solenoid valve. In this solenoid 3B, a side wall portion 34a surrounding a side surface outer periphery of a bobbin 7 around which a coil 6 is wound, and a bobbin 7 are provided. The end wall portion 34b that covers the first end surface 7b is individually formed, and they are integrally joined by means such as welding to form the magnetic body case 34. The thickness of the end wall portion 34b is made larger than the thickness of the side wall portion 34a. When the side wall portion 34a and the end wall portion 34b are individually formed in this manner, the end wall portion 34b can be formed to have an arbitrary thickness, so that the magnetic path can be easily formed.
However, the side wall portion 34a and the end wall portion 34b may have the same thickness.

Since the other constructions and operations in the second embodiment are the same as those in the first embodiment, the same reference numerals as those in the first embodiment are attached to the same major components and their explanations are omitted. To do.

FIG. 3 shows a third embodiment of the present invention only for solenoids for solenoid valves. The solenoid 3C of the third embodiment differs from the first embodiment in that the end of the magnetic body case 4 is different. The wall portion 4b has a cylindrical recess 4d that fits in the center hole 7a in a portion covering the center hole 7a of the bobbin 7, and a magnetic pole surface 4c is formed on an end surface of the recess 4d. It is a point. The recess 4d has the same sectional shape as that of the center hole 7a, and is formed to have a size that fits exactly into the center hole 7a. By providing such a recessed portion 4d in the end wall portion 4b, it is possible to concentrate and smooth the flow of the magnetic flux with the movable iron core to enhance the magnetic attraction force, or between the magnetic body case 4 and the bobbin 7. The mounting state can be stabilized.

The magnetic material case 3 in which the side wall portion 34a and the end wall portion 34b are individually formed as in the second embodiment.
4, the end wall portion 34b can also be provided with such a recess.

Since the structure and operation of the third embodiment other than those described above are the same as those of the first embodiment, the same reference numerals as those in the first embodiment are given to the same major components and their explanations are omitted. .

[Brief description of drawings]

FIG. 1 shows a first embodiment of a solenoid for a solenoid valve according to the present invention as a longitudinal sectional view in a state where it is attached to a solenoid valve, the left half thereof shows a non-energized state to the solenoid, and the right half thereof The energized state of the solenoid is shown.

FIG. 2 is a longitudinal sectional view of a main part showing a second embodiment of a solenoid for a solenoid valve according to the present invention, in which the left half shows a non-energized state to the solenoid, and the right half shows an energized state to the solenoid. There is.

FIG. 3 is a longitudinal sectional view of a main part showing a third embodiment of the solenoid for a solenoid valve according to the present invention.

FIG. 4 is a partial vertical cross-sectional view of a conventional solenoid valve, in which the left half shows a non-energized state of a solenoid and the right half shows an energized state of a solenoid.

[Explanation of symbols]

1 Solenoid valve 2 valve 3A, 3B, 3C solenoid 4,34 Magnetic case 4a, 34a Side wall part 4b, 34b End wall part 4c, 34c Magnetic pole surface 4d recess 5 movable iron core 6 coils 7 bobbins 8 Magnetic plate 7a, 8a central hole 16 valve members

   ─────────────────────────────────────────────────── ─── Continued front page    (72) Inventor Shinichi Yoshimura             4-2-2 Kinnodai, Taniwahara Village, Tsukuba-gun, Ibaraki Prefecture             SMC Corporation Tsukuba Technology Center (72) Inventor Takumi Matsumoto             4-2-2 Kinnodai, Taniwahara Village, Tsukuba-gun, Ibaraki Prefecture             SMC Corporation Tsukuba Technology Center F-term (reference) 5E048 AB01 AD02

Claims (5)

[Claims] 1. A solenoid attached to an electromagnetic valve for driving a valve member for switching a flow path, the solenoid having a central hole extending in an axial direction and having a coil wound around an outer periphery thereof. A bobbin made of a body; having a side wall portion that covers a side surface of the bobbin, and an end wall portion that is formed integrally with or separately from the side wall portion and that covers one end surface in the axial direction of the bobbin and that has a substantially uniform thickness. Magnetic body case: An annular magnetic plate having a central hole coaxially connected to the center hole of the bobbin and connected to the magnetic case on the other end surface side of the bobbin; Central holes of the bobbin and the magnetic plate An end wall portion of the magnetic body case also serves as a fixed iron core, and the movable iron core is provided in a portion of the end wall portion that covers the center hole of the bobbin. Having a magnetic pole surface for adsorption Solenoid for electromagnetic valve which is characterized. 2. The solenoid valve solenoid according to claim 1, wherein the side wall portion and the end wall portion of the magnetic body case are integrally formed and have a uniform thickness as a whole. 3. The magnetic body case according to claim 2, wherein the side wall portion and the end wall portion are formed separately, and the thickness of the end wall portion is larger than the thickness of the side wall portion. Solenoid for solenoid valve. 4. The inner side surface of the end wall portion of the magnetic body case, which covers one end surface in the axial direction of the bobbin, is flat as a whole. Solenoid for solenoid valve. 5. The end wall portion of the magnetic body case has a cylindrical recess fitted in the central hole of the bobbin, the cylindrical concave portion being fitted in the central hole. A solenoid for a solenoid valve according to any one of 1. Is.