JP7121694B2 - solenoid valve - Google Patents

Description

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an electromagnetic valve in which a plunger inserted in a plunger case or the like of an electromagnetic drive unit drives a valve body.

Conventionally, as this type of solenoid valve, there is one disclosed in, for example, Japanese Patent Laying-Open No. 2017-62044 (Patent Document 1). In this electromagnetic valve, the cylindrical portion (plunger case) into which the plunger is inserted is inserted into the center insertion hole of the electromagnetic coil in the electromagnetic drive portion. Then, the cylindrical portion of the lower plate (bottom plate outer case), which is part of the outer case, is inserted into the outer periphery of this cylindrical portion.

JP 2017-62044 A

Here, the outer case of the electromagnetic driving unit increases the efficiency of the magnetic circuit by the magnetism generated by the electromagnetic coil, and influences the driving force of the plunger in the plunger case. However, in Patent Document 1, the cylindrical portion of the bottom plate outer case (lower plate) forming part of the outer case is inserted into the inner peripheral portion of the bobbin of the electromagnetic coil into which the plunger case (cylindrical portion) is inserted. is fixed in place. Also, in order to facilitate the insertion of the plunger case into the electromagnetic drive section, a predetermined gap is secured between the outer peripheral portion of the plunger case and the inner peripheral portion of the cylindrical portion of the bottom plate outer case. Therefore, the magnetic efficiency of the magnetic circuit may decrease. If the magnetic efficiency decreases, the current flowing through the electromagnetic coil must be increased accordingly, which causes the problem that the electromagnetic coil generates more heat.

An object of the present invention is to provide an electromagnetic valve that reduces the temperature rise of the electromagnetic coil.

A solenoid valve according to the present invention comprises a cylindrical case body into which a plunger is inserted, an electromagnetic coil into which the case body is inserted to drive the plunger, and an outer casing comprising a magnetic body fitted to the electromagnetic coil. and an electromagnetic drive unit having an electromagnetic drive unit, wherein the electromagnetic coil is formed with an insertion hole through which the case body is inserted, and the outer case and the plunger are magnetically connected in the vicinity of the insertion hole A connecting portion made of a magnetic material is provided to closely press the case body from its surroundings, and the connecting portion includes a cylindrical portion into which the case body is inserted and fitted, and the electromagnetic coil of the cylindrical portion. and a brim-shaped portion integrally connected to the outer circumference of an end on the side, and in the cylindrical portion and the brim-shaped portion, the cylindrical portion is on the side opposite to the electromagnetic coil from the brim-shaped portion. a gap that extends outward from the fitting hole of the cylindrical part and extends outward from the fitting hole of the cylindrical part at one place on the periphery of the fitting hole into which the case body is fitted. It is characterized in that notches are formed at a plurality of locations on the periphery of the collar-like portion around the axis, while forming slits.

According to the present invention, since the connecting portion made of a magnetic material that magnetically connects the outer case and the plunger is pressed against the case body into which the plunger is inserted without any gap, the connecting portion can be connected to the plunger. Since they are arranged as close as possible to each other, the efficiency of the magnetic circuit due to the lines of magnetic force passing through the outer case made of magnetic material and the connecting part made of magnetic material is increased, the current flowing through the electromagnetic coil is reduced, and the temperature rise of the electromagnetic coil is increased. can be reduced. In addition, since a plurality of notches are formed in the brim portion, even when the case body is press-fitted between the cylindrical portion and the brim portion, the brim portion maintains flatness without being deformed in the axial direction. can be secured. Therefore, there is no magnetic leakage between the brim and the outer case, and the magnetic efficiency is improved.

In this case, it is preferable that the cylindrical portion of the connecting portion is formed in an annular shape having an inner diameter smaller than the outer diameter of the case body in a natural state.

In addition, the connecting portion is configured separately from the outer case, and the flange portion is provided with a plurality of radial notches that are continuous from the fitting hole of the cylindrical portion to the outer diameter end surface, Preferably, the solenoid valve is configured such that the brim-shaped portion faces the outer case and is in close contact with the outer case. Thus, since a plurality of notches are formed in the flange, even when the case body is press-fitted between the cylindrical portion and the flange, the flange does not deform in the axial direction. Therefore, since the flatness for contacting the outer case can be secured, the outer case and the brim can be brought into close contact with each other over the entire surface, and there is no magnetic leakage between the brim and the outer case. gets better.

Further, the connecting portion is integrally formed with the outer case, and the one slit is formed from the cylindrical portion, which is the connecting portion, to the outer peripheral end of the plate-like outer case that constitutes the outer case. , The solenoid valve may be characterized in that the plurality of cutouts are formed from the cylindrical portion to the plate-like outer case.

Moreover, it is preferable that the solenoid valve includes an elastic member that presses the connecting portion against the outer casing. In this case, since the brim portion is pressed against the outer case, the magnetic efficiency is further improved.

Further, when the electromagnetic coil is energized, the plunger moves toward the attractor provided on the case body, and the cylindrical portion of the connecting portion is entirely axially aligned with the case body of the plunger. Preferably, the electromagnetic valve is configured to overlap the sliding portion in a direction perpendicular to the axial direction. As a result, magnetic leakage between the cylindrical portion and the plunger can be reduced.

Further, it is preferable that the solenoid valve is characterized in that an annular recessed portion is formed by striking processing at the root portion of the cylindrical portion of the brim portion. As a result, it is possible to prevent springback at the time of forming the brim portion and to obtain a right angle with respect to the cylindrical portion or the axis line. Since the shaped portion can be press-contacted over a wide area without gaps, it is possible to reduce magnetic leakage between the bottom plate outer case and the flanged portion. In addition, for example, the bottom plate outer case is brought into contact with the bottom surface of the electromagnetic coil without any gap, and is securely fitted to the inner peripheral surface of the opening of the cup-shaped outer case composed of the cylindrical side surface portion and the top plate portion. Therefore, magnetic leakage between the cup-shaped outer case and the bottom plate outer case can be reduced.

According to the solenoid valve of the present invention, while ensuring the insertability of the case body into the connecting portion, the efficiency of the magnetic circuit due to the magnetic lines of force passing through the outer case made of a magnetic substance and the connecting portion made of a magnetic substance is increased, and the electromagnetic coil can reduce the temperature rise of the electromagnetic coil.

It is a vertical cross-sectional view of the valve closed state of the electromagnetic valve of the first embodiment of the present invention. It is a vertical cross-sectional view of the valve-open state of the electromagnetic valve of 1st Embodiment. FIG. 2 is a view taken along line PP of FIG. 1; FIG. 4A is a side external view, a vertical cross-sectional view, and a plan view of a coil guide in the electromagnetic valve of the first embodiment; It is a longitudinal cross-sectional view of the valve closed state of the electromagnetic valve of the second embodiment of the present invention. FIG. 6 is a view taken along line PP of FIG. 5; It is a side view of the bottom-plate outer case in the electromagnetic valve of 2nd Embodiment.

Next, an embodiment of the solenoid valve of the present invention will be described with reference to the drawings. In addition, the solenoid valve of each following embodiment is an example of a pilot type solenoid valve. 1 is a longitudinal sectional view of the solenoid valve of the first embodiment when not energized; FIG. 2 is a longitudinal sectional view of the solenoid valve of the first embodiment when energized; FIG. 4A and 4B are a side external view (FIG. 4A), a longitudinal sectional view (FIG. 4B), and a plan view (FIG. 4A) of the coil guide in the solenoid valve of the first embodiment. (C)). It should be noted that the concept of "up and down" in the following description corresponds to up and down in the drawings of FIGS. 1 and 2. FIG. The solenoid valve of this embodiment comprises a main body portion 1 made of metal, an electromagnetic driving portion 2 provided on the upper portion of the main body portion 1, a coil guide 3 as a "connecting portion" described later, and an elastic member 4. have.

The main body 1 includes a high-pressure primary joint 1A into which a fluid such as a refrigerant flows, a secondary joint 1B into which the fluid flows out, and an axis L perpendicular to the primary joint 1A and the secondary joint 1B. A cylinder portion 1C and a case holder portion 1D coaxial with the cylinder portion 1C are integrally formed. A partition 11 is formed between the primary side joint 1A and the secondary side joint 1B in the body portion 1, and a main valve seat 12 is formed on the side of the partition 11 toward the cylinder portion 1C. A main valve port 12 a having a circular opening is formed in the main valve seat 12 , and a thin circular valve chamber 13 is formed around the main valve seat 12 . The cylinder portion 1C is formed in a cylindrical shape with the axis L as the center of rotation, and the case holder portion 1D is formed in a cylindrical shape extending from the cylinder portion 1C toward the electromagnetic drive portion 2 side. A guide hole 14 having the same diameter as the valve chamber 13 is formed inside the cylinder portion 1C, and a substantially cylindrical piston valve 5 is inserted in the guide hole 14. As shown in FIG.

The piston valve 5 is integrally formed by mutually press-fitting a metal (for example, brass) piston portion 51 covering the outside and a resin (for example, PTFE) seal portion 52 disposed inside thereof. It is. The piston valve 5 is arranged to face the main valve port 12a, and a valve opening spring 53 is compressed between the bottom of the valve chamber 13 and the piston valve 5. As shown in FIG. The spring force of the valve-opening spring 53 urges the piston valve 5 in the direction (valve-opening direction) away from the main valve port 12a. Thereby, the seal portion 52 closes the main valve port 12 a when the piston valve 5 is seated on the main valve seat 12 . A pilot port 5a and a conducting path 5b are formed in the center of the seal portion 52, and the pilot port 5a is conducted to the secondary side joint 1B via the conducting path 5b and the main valve port 12a. A pilot valve seat 5a1 is provided around the pilot port 5a. A clearance is provided between the piston valve 5 and the cylinder portion 1C, and the fluid on the primary side joint 1A side can flow into the back space 15 of the piston valve 5 via this clearance.

The electromagnetic drive unit 2 includes a plunger case 21 as a cylindrical “case body” centered on the axis L, a plunger 22 made of a magnetic material inserted in the plunger case 21 , and fixed to the upper end of the plunger case 21 . a plunger spring 24 disposed between the plunger 22 and the attractor 23; an electromagnetic coil 25 formed by sealing (enclosing) a cylindrical coil with a resin material; It is a magnetic member that is fitted around the outer periphery of the coil 25, and includes an outer casing 26 made of, for example, an iron plate.

The outer case 26 is composed of a bottomed cup-shaped outer case 26A made of a magnetic material and a bottom plate outer case 26B made of a magnetic material whose outer peripheral portion is aligned with the opening of the cup-shaped outer case 26A. there is 26 A of cup-shaped outer cases are comprised from the cylindrical side part 26a and the top-plate part 26b corresponding to the bottom of a cup shape. The electromagnetic coil 25 is arranged in the cup-shaped outer case 26A. With the lead wire holding portion 25a of the electromagnetic coil 25 fitted into the rectangular cutout portion 26c of the bottom plate outer case 26B, the bottom plate outer case 26B is closed. It is fitted in the opening of the cup-shaped outer case 26A. As a result, the electromagnetic coil 25 is covered with the cup-shaped outer case 26A and the bottom plate outer case 26B, and is sandwiched between the top plate portion 26b and the bottom plate outer case 26B, and the bottom plate outer case 26B contacts the bottom surface of the electromagnetic coil 25. are in contact. The electromagnetic coil 25 has a central hole 25A into which the plunger case 21 is inserted. A central hole 26d for inserting the plunger case 21 is formed in the bottom plate outer case 26B, and a screw hole 26e for screwing the suction element 23 with a screw N is formed in the top plate portion 26b.

The plunger case 21 is fitted into the case holder portion 1D, and the edges of the plunger case 21 and the case holder portion 1D are fixed by brazing or the like. In addition, the plunger 22 is slidably arranged in the direction of the axis L (vertical direction) within the plunger case 21 . A ball-shaped pilot valve 22 a is crimped to the lower end of the plunger 22 , and opens and closes the pilot port 5 a of the piston valve 5 .

With the above configuration, the electromagnetic valve of the embodiment is provided in a refrigeration cycle system, high-pressure refrigerant flows into the primary joint 1A, and refrigerant flows out of the secondary joint 1B. When the electromagnetic coil 25 is not energized (non-energized state), the state shown in FIG. At this time, the pilot valve 22a closes the pilot port 5a, so that the back space 15 of the piston valve 5 becomes the same high pressure as the pressure of the primary side joint 1A. Therefore, the piston valve 5 descends together with the pilot valve 22a to close the main valve port 12a, thereby blocking the passage of the refrigerant.

When the electromagnetic coil 25 is energized, as shown in FIG. 2, an attractive force is generated between the attractor 23 and the plunger 22 to raise the plunger 22 and separate the pilot valve 22a from the pilot port 5a. As a result, the back space 15 of the piston valve 5 is conducted to the secondary side joint 1B and the pressure becomes low. As a result, the upward force generated by the pressure difference between the back space 15 of the piston valve 5 and the primary side joint 1A and the spring force of the valve opening spring 53 move the piston valve 5 away from the main valve port 12a to open the valve. Refrigerant flows from the primary side joint 1A to the secondary side joint 1B.

As shown in FIGS. 3 and 4, the coil guide 3 is formed by pressing a metal plate made of a magnetic material having elasticity. A brim-like portion 32 having a substantially annular shape centered on the axis L and connected to the end portion of the brim 31 is integrally formed. In addition, slits 31a and 32a are formed continuously in the direction of the axis L at one portion of the cylindrical portion 31 and the brim portion 32, respectively. In addition, in the flange portion 32, radially extending from the inner diameter portion of the cylindrical portion 31 into which the plunger case 21 is press-fitted to the outer peripheral portion of the flange portion 32 at a plurality of locations (seven locations) on the circumference around the axis L. A widening notch 32b is formed. Furthermore, in the coil guide 3, in a natural state before the plunger case 21 is inserted, the inner diameters of the cylindrical portion 31 and the flange portion 32 are the same, and this inner diameter is slightly larger than the outer diameter of the plunger case 21. It's getting smaller. At this time, the gap between the slits 31a and 32a may not exist, and it is sufficient if the gap can be widened by press-fitting the plunger case 21 . The coil guide 3 is press-fitted to the outer periphery of the plunger case 21 with the flange 32 facing the electromagnetic coil 25, the slits 31a and 32a widen, and the flange 32 is parallel to the bottom plate outer case 26B of the outer case 26. , and is in contact with this bottom plate outer case 26B.

Further, the coil guide 3 has an annular concave portion 32c formed by striking at the root portion of the cylindrical portion 31 of the brim portion 32. As shown in FIG. Furthermore, an elastic member 4 is fitted around the outer periphery of the plunger case 21 . The elastic member 4 is a ring-shaped elastic member made of rubber or the like, and is arranged in a state of being compressed in the direction of the axis L between the lower end surface of the cylindrical portion 31 of the coil guide 3 and the upper end surface of the case holder portion 1D. It is The elastic member 4 urges the bottom plate outer case 26b to the electromagnetic coil 25 side together with the coil guide 3 with the case holder portion 1D side as a fixed end by its elastic force. As a result, the flange portion 32 of the coil guide 3 is pressed against the bottom plate outer case 26B of the outer case 26 .

As described above, the coil guide 3 is pressed against the plunger case 21 with no gap due to the elastic force of the cylindrical portion 31 and the flange portion 32. Therefore, the coil guide 3 is arranged as close to the plunger 22 as possible. be done. In addition, since the flange 32 of the coil guide 3 that magnetically connects the outer case 26 and the plunger 22 is pressed against the bottom plate outer case 26B of the outer case 26 by the elastic force of the elastic member 4, the coil guide 3 and the bottom plate There is no gap between the case and the outer case 26B. Furthermore, a plurality of cutouts 32b are formed in the collar-shaped portion 32, and the collar-shaped portion 32 is divided into a plurality of fan-shaped portions. Therefore, even if the plunger case 21 is press-fitted into the cylindrical portion 31 and the flange portion 32 and the diameter of the cylindrical portion 31 and the flange portion 32 is slightly expanded from the natural state, cutting is The brim portion 32 is not deformed in the direction of the axis L due to the narrowing of the notch 32b.

In addition, since the notch 32b reduces the load in the direction in which the inner diameter of the brim 32 is expanded, the insertability of the plunger case 21 is improved, and the coil guide 3 is in close contact with the outer periphery of the plunger case 21, and the axial line L Since it becomes easy to slide in the direction, the elastic force of the elastic member 4 allows the brim portion 32 to reliably press against the bottom plate outer case 26B.

That is, almost no stress is generated in the circumferential direction around the axis L in the fan-shaped portions of the brim 32, and the planar shape in the plane orthogonal to the axis L is maintained. Therefore, flatness for contacting the bottom plate outer case 26B at the brim portion 32 can be ensured. Therefore, there is no magnetic leakage between the brim portion 32 and the bottom plate outer case 26B, and the magnetic efficiency is improved. Therefore, the efficiency of the magnetic circuit by the lines of magnetic force passing through the outer case 26 made of a magnetic material and the coil guide 3 made of a magnetic material is increased, and the current flowing through the electromagnetic coil 25 is reduced, thereby reducing the temperature rise of the electromagnetic coil 25. can. 2, the position of the lowermost end 22T of the portion of the plunger 22 in sliding contact with the inner peripheral surface of the plunger case 21 is slightly closer to the elastic member 4 than the lower end 31T of the cylindrical portion 31 of the coil guide 3. It is a position that protrudes to That is, when the electromagnetic coil 25 is energized, the plunger 22 moves toward the attractor 23 provided in the plunger case 21, and the entire cylindrical portion 31 of the coil guide 3 in the direction of the axis line L moves toward the plunger case 21 of the plunger 22. It is configured to overlap in a direction orthogonal to the direction of the axis line L on the sliding portion for. As a result, the plunger 22 and the coil guide 3 completely overlap in the direction perpendicular to the direction of the axis L, and magnetic leakage between the cylindrical portion 31 of the coil guide 3 and the plunger 22 is further reduced.

In addition, as described above, the root portion of the cylindrical portion 31 of the coil guide 3 is subjected to striking processing, thereby preventing springback during formation of the flange portion 32, and preventing the cylindrical portion 31 or It is possible to obtain a perpendicularity to the axis L, and it is possible to press the brim portion 32 of the coil guide 3 to the bottom plate outer case 26B over a wide area without a gap, so that the bottom plate outer case 26B and the brim portion can be pressed. 32 can be reduced.

FIG. 5 is a vertical cross-sectional view of the solenoid valve of the second embodiment in the valve closed state, FIG. 6 is a view from the arrow PP of FIG. 5, and FIG. 7 is a side view of the bottom plate outer casing of the solenoid valve of the second embodiment. be. In the following second embodiment, elements similar to those of the first embodiment exhibit similar effects, and similar members in the drawings of the second embodiment are denoted by the same reference numerals as in FIG. description will be omitted as appropriate.

The second embodiment differs from the first embodiment in the configuration of the coil guide 6 as a "connecting part". It is the point that it was configured as a part. The bottom plate outer case 26B' is made of a magnetic material having radial elasticity, and is fitted inside the opening of the cup-shaped outer case 26A and contacts the bottom surface of the electromagnetic coil 25 as in the first embodiment. is. Also, the bottom plate outer box 26B' has the coil guide 6 integrally formed in the center thereof. The coil guide 6 is composed of a cylindrical portion centered on the axis L at its center, and a slit 26f continuing to the coil guide 6 is formed at one point of the bottom plate outer case 26B' on the outer circumference of the coil guide 6. . Further, the coil guide 6 is formed with vertical notches 6a (see FIG. 7) in the direction of the axis L at a plurality of locations (seven locations) on the circumference around the axis L in the cylindrical portion thereof. A notch 26g (see FIG. 6) extending radially from the inner diameter portion of the cylindrical portion of the coil guide 6 is formed in the bottom plate outer case 26B' so as to connect to the notch 6a.

In the natural state before the plunger case 21 is inserted, the inner diameter of the cylindrical portion of the bottom plate outer case 26B' and the coil guide 6 is slightly smaller than the outer diameter of the plunger case 21. As shown in FIG. The coil guide 6 is press-fitted to the outer periphery of the plunger case 21 with the bottom plate outer casing 26B' attached to the electromagnetic coil 25. As shown in FIG. In addition, the coil guide 6 has an annular concave portion 6c formed by striking processing at the root portion of the cylindrical portion of the bottom plate outer case 26B' that constitutes the brim portion. Further, an elastic member 4 similar to that of the first embodiment is fitted around the outer periphery of the plunger case 21 and arranged between the electromagnetic coil 25 and the upper end surface of the case holder portion 1D. The elastic member 4 urges the bottom plate outer case 26B' and the coil guide 6 toward the electromagnetic coil 25 with the case holder portion 1D as a fixed end.

As described above, the coil guide 6 is pressed against the plunger case 21 with no gap due to the elastic force of its cylindrical portion. placed as close to each other as possible. Also, the bottom plate outer case 26B' and the coil guide 6 are pressed against the electromagnetic coil 25 by the elastic force of the elastic member 4. As shown in FIG. Further, a plurality of cutouts 26g are formed in the bottom plate outer case 26B', and the circumference of the coil guide 6 constituting the "flange" of the bottom plate outer case 26B' is divided into a plurality of fan-shaped portions. Therefore, even if the plunger case 21 is press-fitted between the coil guide 6 and the bottom plate outer case 26B' and the coil guide 6 and its surroundings are slightly expanded in diameter from the natural state, the coil guide 6 will remain intact. The circumference does not deform in the direction of the axis L. That is, almost no stress is generated in the circumferential direction around the axis L around the coil guide 6, and the planar shape in the plane orthogonal to the axis L is maintained, and the outer casing 26A in the outer peripheral portion is fitted. parts will not be deformed. Therefore, flatness can be ensured around the coil guide 6 of the bottom plate outer case 26B'. Therefore, there is no magnetic leakage between the bottom plate outer case 26B' and the cup-shaped outer case 26A, and the magnetic efficiency is improved. Therefore, the efficiency of the magnetic circuit by the lines of magnetic force passing through the outer casing 26 made of a magnetic material and the coil guide 6 made of a magnetic material is increased, and the current flowing through the electromagnetic coil 25 is reduced, thereby reducing the temperature rise of the electromagnetic coil 25. can.

In addition, since the notches 6a and 26g reduce the load in the direction in which the inner diameter of the cylindrical portion is expanded, the insertability of the plunger case 21 is improved, and the inner diameter of the cylindrical portion is in close contact with the outer periphery of the plunger case 21, and the axial line L Since it becomes easy to slide in the direction, the elastic force of the elastic member 4 allows the outer peripheral portion of the bottom plate outer case to reliably contact the opening of the cup-shaped outer case.

Also, as in the first embodiment, when the power is supplied, the position of the lowermost end 22T of the portion of the plunger 22 in sliding contact with the inner peripheral surface of the plunger case 21 is slightly elastic than the lower end 6T of the cylindrical portion of the coil guide 6. It is positioned so as to protrude toward the member 4 side. That is, when the electromagnetic coil 25 is energized, the plunger 22 moves toward the attractor 23 provided in the plunger case 21, and the entire cylindrical portion of the coil guide 6 in the direction of the axis line L moves from the plunger 22 to the plunger case 21. It is configured to overlap with the sliding portion in a direction perpendicular to the direction of the axis L. As a result, the plunger 22 and the coil guide 6 completely overlap in the direction orthogonal to the direction of the axis L, and magnetic leakage between the cylindrical portion of the coil guide 6 and the plunger 22 is further reduced.

In addition, as described above, the root portion of the cylindrical portion of the coil guide 6 is subjected to a striking process, and the bottom plate outer case 26B' is brought into contact with the bottom surface of the electromagnetic coil 25 without any gap, and the cup-shaped outer case 26A is mounted. Since it can be reliably fitted to the inner peripheral surface of the opening of the cup-shaped outer case 26A and the bottom plate outer case 26B', magnetic leakage can be reduced.

Although the embodiments of the present invention have been described in detail above with reference to the drawings, the specific configuration is not limited to these embodiments, and design modifications and the like are made within the scope of the present invention. is included in the present invention.

1 Main body portion 1A Primary side joint 1B Secondary side joint 1C Cylinder portion 1D Case holder portion 12 Main valve seat 12a Main valve port 13 Valve chamber 2 Electromagnetic drive portion 21 Plunger case (case body)
22 Plunger 22a Pilot valve 23 Attractor 24 Plunger spring 25 Electromagnetic coil 26 Outer case 26A Cup-shaped outer case 26B Bottom plate outer case 26a Side portion 26b Top plate portion 3 Coil guide (connecting portion)
31 Cylindrical portion 32 Collar portion 31a Slit 32a Slit 32b Notch 4 Elastic member 5 Piston valve 6 Coil guide (connecting portion)
26B' Bottom plate outer case

Claims (7)

a cylindrical case body into which a plunger is inserted; an electromagnetic coil into which the case body is inserted to drive the plunger; A solenoid valve comprising
An insertion hole through which the case body is inserted is formed in the electromagnetic coil,
A connecting portion made of a magnetic material that magnetically connects the outer case and the plunger in the vicinity of the insertion hole and presses the case body from the surroundings to closely contact the case body,
The connection portion is composed of a cylindrical portion into which the case body is inserted and fitted, and a brim-shaped portion integrally connected to the outer periphery of the end portion of the cylindrical portion on the side of the electromagnetic coil,
In the cylindrical portion and the brim portion, the cylindrical portion is exposed and extends from the brim portion to the side opposite to the electromagnetic coil,
A slit forming a continuous gap from the fitting hole of the cylindrical part to the outside is formed at one place on the periphery of the fitting hole into which the case body is fitted. 1. An electromagnetic valve, wherein notches are formed at a plurality of locations on the circumference of said flange around said axis. 2. The solenoid valve according to claim 1, wherein the cylindrical portion of the connecting portion is formed in an annular shape having an inner diameter smaller than the outer diameter of the case body in a natural state. The connection portion is configured separately from the outer case, and the flange portion is provided with a plurality of radial notches that are continuous from the fitting hole of the cylindrical portion to the outer diameter end surface, and the flange 3. The solenoid valve according to claim 1, wherein the shaped portion is configured to face the outer case and be in close contact with the outer case. The connecting portion is integrally formed with the outer case, and the one slit is formed from the cylindrical portion, which is the connecting portion, to the outer peripheral end of the plate-shaped outer case that constitutes the outer case, and the 2. The solenoid valve according to claim 1, wherein said plurality of notches are formed from said cylindrical portion to said plate-shaped outer case. 5. The electromagnetic valve according to claim 3, further comprising an elastic member that presses the connection portion against the outer casing. When the electromagnetic coil is energized, the plunger moves toward the attractor provided on the case body, and the entire axial direction of the cylindrical portion of the connecting portion causes the plunger to slide relative to the case body. The solenoid valve according to any one of claims 1 to 5, wherein the solenoid valve is configured so as to overlap with the portion in a direction orthogonal to the axial direction. The solenoid valve according to any one of claims 1 to 6, characterized in that an annular concave portion is formed by a striking process at the root portion of the cylindrical portion of the brim portion.

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