Solenoid valve

Abstract

The present invention provides a solenoid valve having a yoke whose top plate is not easily deformed. A solenoid valve (1) comprises: a housing (2) having an inflow passage (21) and an outflow passage (22) for a fluid; a solenoid portion (3) having a solenoid (30), a fixed iron core (31), a movable iron core (32) and a valve core (32b); and a yoke (4) made of a magnetic material, surrounding the solenoid portion (3) and mounted on the housing (2), wherein the yoke (4) comprises: a bottom plate (4A) mounted on the housing (2); A top plate (4B); a connecting plate (4C) connecting the bottom plate (4A) and the top plate (4B); and extension pieces (4D, 4E) extending downward from the top plate (4B) in an integral manner, the extension pieces (4D, 4E) comprising: a hanging portion (41) hanging from the top plate (4B); and a bent portion (42) extending from the hanging portion (41) toward the bottom plate (4A) and forming a mounting portion (42a, 42b) mounted on the housing (2).

Description

Technical Field

[0001] The present invention relates to an electromagnetic valve which opens and closes the valve by the magnetic force of an electromagnet. Background Art

[0002] A solenoid valve is a valve in which a movable iron core is arranged inside a cylindrical solenoid using an electromagnet, and the movable iron core is controlled to move linearly reciprocatingly by the magnetic force generated by the power supplied to the solenoid. Due to its easy control, it has been widely used to control oil pressure and water pressure.

[0003] As such an electromagnetic valve, the electromagnetic valve shown in patent document 1 comprises: a cylindrical solenoid; a fixed iron core and a movable iron core, which are enclosed in a cylindrical tube component on the inner side of the solenoid; and a yoke, which is made of magnetic material, is arranged on the outer side of the solenoid and has a through hole for the tube component to pass through in the up and down directions, wherein a magnetic flux is generated by supplying electric power to the solenoid, and a magnetic circuit is formed by the yoke to smoothly move the movable iron core toward the fixed iron core side, and the valve core arranged below the movable iron core is moved.

[0004] Prior art literature

[0005] Patent Literature

[0006] Patent Document 1: Japanese Patent Application Laid-Open No. 8-285114 (page 2, Figure 1 ) Summary of the invention

[0007] Problems to be solved by the invention

[0008] However, in the solenoid valve such as Patent Document 1, the yoke is in a U-shaped shape with the front side open, the bottom plate is fixed to the housing, and the top plate is in a cantilever state, so the rigidity of the yoke is low. Therefore, when a force is applied to the top plate of the yoke, the yoke is deformed, and the fixed iron core and the movable iron core contained in the pipe member penetrating the through hole of the yoke are tilted, which may cause the accuracy of the solenoid valve to decrease.

[0009] The present invention has been made in view of such a problem, and an object of the present invention is to provide a solenoid valve including a yoke whose top plate is less likely to deform.

[0010] Means for solving problems

[0011] In order to solve the above problems, the solenoid valve of the present invention comprises:

[0012] a housing having an inflow passage and an outflow passage for a fluid; a solenoid portion having a solenoid, a fixed iron core, a movable iron core, and a valve core; and a yoke made of a magnetic material, surrounding the solenoid portion and mounted on the housing,

[0013] The yoke includes: a bottom plate placed on the housing; a top plate; a connecting plate connecting the bottom plate and the top plate; and an extending piece extending downward from the top plate as a whole.

[0014] The extending piece includes a hanging portion hanging from the top plate and a bent portion extending from the hanging portion toward the bottom plate and having a mounting portion mounted on the housing.

[0015] Thus, the extension piece extending from the top plate of the yoke is supported by the housing in addition to the connection plate, so the top plate is not easily deformed. In addition, the extension piece cooperates with the connection plate to form a magnetic circuit, thereby improving magnetic efficiency.

[0016] Alternatively, at least a pair of the extending pieces may be provided, and the pair of extending pieces may extend from the top plate of the yoke in a manner facing each other.

[0017] Thus, the extending pieces can be fixed to the housing, respectively, so that the top plate is less likely to be deformed by external forces.

[0018] Alternatively, an end surface of the bent portion may be arranged to face an end surface of the bottom plate.

[0019] Thus, the end surface of the bent portion and the end surface of the bottom plate are arranged close to each other in the entire vertical direction, thereby improving the magnetic efficiency.

[0020] The thickness of the bent portion may be substantially the same as the thickness of the bottom plate.

[0021] Thus, the yoke can be manufactured from a single plate, and the number of components constituting the yoke can be reduced.

[0022] The mounting portion may be arranged at a position away from the hanging portion in the front-rear direction.

[0023] Thereby, the yoke can be fixed to the housing from the upper side, and the yoke can be easily attached to the housing.

[0024] The mounting portion may be disposed at a position spaced apart from the hanging portion forward and at a position spaced apart from the hanging portion rearward, respectively.

[0025] This can increase the mounting strength of the yoke with respect to the housing. BRIEF DESCRIPTION OF THE DRAWINGS

[0026] Figure 1 is a three-dimensional diagram of the solenoid valve of the present invention;

[0027] Figure 2 (a) is an AA cross-sectional view of the electromagnetic valve in which the solenoid portion is energized, and (b) is a cross-sectional view for explaining the small communication path of the main valve portion;

[0028] Figure 3 It is a three-dimensional diagram of the unfolded yoke;

[0029] Figure 4 This is a three-dimensional picture of the yoke during its manufacture;

[0030] Figure 5 It is a three-dimensional diagram of the yoke;

[0031] Figure 6 It is a top view of the solenoid valve;

[0032] Figure 7 It is a BB cross-sectional view of the solenoid valve in which the solenoid portion is in a non-energized state;

[0033] Figure 8 It is a perspective view showing a modified example of the yoke. DETAILED DESCRIPTION

[0034] Hereinafter, a mode for implementing the solenoid valve of the present invention will be described based on embodiments.

[0035] Example

[0036] Reference Figures 1 to 7 The solenoid valve of the embodiment will be described.

[0037] like Figure 1 As shown, the solenoid valve 1 controls the flow rate and pressure of a fluid such as oil or water. In this embodiment, the solenoid valve 1 which is assembled in a water conditioner and appropriately changes the flow and stop of water discharged from a nozzle is described.

[0038] like Figure 1 and Figure 2 As shown, the solenoid valve 1 comprises: a housing 2 having an inflow passage 21 and an outflow passage 22 for water; a solenoid portion 3, which mainly comprises a cylindrical solenoid 30 and a fixed iron core 31 and a movable iron core 32 disposed inside the solenoid 30 (see Figure 2 ) and is mounted above the housing 2; and a yoke 4, which surrounds the solenoid portion 3 from the outside.

[0039] The housing 2 has: an inflow passage 21; an outflow passage 22; a bottomed cylindrical portion 23, which forms a main valve chamber 2A (see Figure 2 ); and a pair of extension portions 24 (reference Figure 1 ), which extends from the cylindrical portion 23 in the outer diameter direction and has a substantially trapezoidal shape when viewed from above. In addition, a concave portion 25 that is open upward and has a rectangular shape when viewed from above is formed between the cylindrical portion 23 and the protruding portion 24 (see Figure 2 ), the shell 2 is lightweight.

[0040] The inflow passage 21 is formed to penetrate the cylindrical portion 23 orthogonally to the axial direction. In addition, a protrusion 6 extending upward is formed at the bottom 2B of the main valve chamber 2A, and a through hole 60 is formed on the protrusion 6 that penetrates in the axial direction and communicates with the outflow passage 22. The protrusion 6 is annular in shape when viewed in the axial direction, and a main valve seat 61 is formed at the upper end.

[0041] In addition, if Figure 2 As shown, in the cylindrical portion 23, an opening recess 2C is formed on the upper side of the main valve chamber 2A, which is recessed axially downward and has an annular bottom surface. The opening recess 2C is connected to the bottom 2B and is connected to the outside of the housing 2 in the state before assembly. The main valve portion 50 as the main valve core is accommodated in the opening recess 2C together with the adapter 70. The yoke 4 is mounted and fixed on the extension portion 24. The solenoid valve 1 of this embodiment is a pilot-operated solenoid valve that can close the valve using the pilot pressure acting on the main valve portion 50.

[0042] The main valve portion 50 is composed of a base 51 and a diaphragm 55. The base 51 is formed with: a bottomed recessed portion 52; an extension portion 53 extending from the radial center of the recessed portion 52 in the up and down directions; and a protrusion 54 extending downward from the outer diameter end of the recessed portion 52 and the center of the extension portion 53 (see Figure 2 (b)). A large communication passage 53a is formed in the extension portion 53 and is connected to the opening recessed portion 2C side and the outflow passage 22 side of the bottom portion 2B in the axial direction, and a small communication passage 54a is formed in the protrusion portion 54 and is connected to the inflow passage 21 side of the bottom portion 2B and the opening recessed portion 2C side (see Figure 2 (b)). In addition, the extension portion 53 is annular when viewed in the axial direction, and the upper end of the extension portion 53 becomes a pilot valve seat 53b for the pilot valve core 32b described later to abut. In addition, in order to explain the protrusion 54 and the small connecting passage 54a, Figure 2 (b) shows the Figure 2 The cross-sectional view shown in (a) shows the position of the phase shift along the circumferential direction.

[0043] The diaphragm 55 is formed with through holes aligned with the extension 53 and the protrusion 54, and the extension 53 and the protrusion 54 of the base 51 are inserted and fixed in each through hole. In addition, the extension 53 and the protrusion 54 are both formed with flanges protruding toward the outer diameter side at the lower end, so that when the extension 53 and the protrusion 54 are inserted into the through holes, they are prevented from falling off by the flanges.

[0044] The adapter 70 includes a lower side recess 71 which is recessed axially upward on the outer diameter side and has an annular bottom surface, and an upper side recess 72 which is recessed axially downward on the inner diameter side relative to the lower side recess 71 and has an annular bottom surface, and a through hole which penetrates axially is formed in the radial center portion.

[0045] Next, the solenoid portion 3 will be described. The bobbin 8 is mainly molded of resin, and is formed with a through hole 80 that penetrates in the axial direction and an annular opening 81 that opens to the side on the outer peripheral surface. The fixed iron core 31 and the movable iron core 32 are arranged inside the through hole 80 of the bobbin 8, and the solenoid 30 is arranged therein by winding a copper wire in the opening 81. In addition, on the outer peripheral surface of the lower side of the bobbin 8, a recess 83 that opens to the outer diameter side is formed by an upper annular flange 83a extending to the outer diameter side and a lower annular flange 83b extending to the outer diameter side, and the outer fitting portion 40 of the bottom plate 4A of the yoke 4 described later is fitted outside the recess 83.

[0046] A step portion 82 partially protruding inward is formed in the through hole 80 of the winding frame 8, and the annular protrusion 31a formed on the outer peripheral surface of the fixed iron core 31 abuts against the step portion 82, thereby limiting the movement of the fixed iron core 31 in the vertical direction downward. The movable iron core 32 is arranged on the lower side of the fixed iron core 31 via the compressed spring 32a. In addition, a pilot valve core 32b is integrally arranged at the lower end of the movable iron core 32, and the movable iron core 32 is urged downward by the force of the above-mentioned spring 32a, so that the pilot valve core 32b abuts against the pilot valve seat 53b of the main valve portion 50.

[0047] The outer periphery of the solenoid 30 and the winding frame 8 is covered with a molded member 9. The molded member 9 is mainly formed of resin, and a terminal 91 extending in the outer diameter direction is formed on the upper side (see Figure 1 The terminal 91 is electrically connected to the solenoid 30 , and a magnetic flux is generated around the solenoid 30 by supplying power to the terminal 91 .

[0048] The movable iron core 32 is magnetically attracted to the fixed iron core 31 disposed on the upper side by the magnetic flux generated when the solenoid 30 is energized, and the pilot valve core 32 b disposed below the movable iron core 32 moves upward together with the movable iron core.

[0049] Reference Figure 2 When power is supplied to the terminal 91, the pilot valve core 32b leaves the pilot valve seat 53b of the main valve portion 50, and the diaphragm 55 of the main valve portion 50 is separated from the main valve seat 61. As a result, water flows from the inflow passage 21 through the through hole 60 to the outflow passage 22.

[0050] On the other hand, when the power supply to the terminal 91 is stopped, the movable iron core 32 is always urged downward by the spring 32a, and the pilot valve core 32b is brought into contact with the pilot valve seat 53b of the main valve portion 50. As a result, the diaphragm 55 is elastically deformed toward the bottom 2B side and the diaphragm 55 is brought into contact with the main valve seat 61. The solenoid valve 1 is in a water-stop state (see Figure 7 ).

[0051] Next, the yoke 4 is described. The yoke 4 is disposed outside the molded part 9. The yoke 4 is formed of a magnetic material, and the molded part 9 is surrounded by the yoke 4 to form a magnetic circuit that concentrates the magnetic flux generated when power is supplied to the solenoid 30. The yoke 4 also functions as a shell of the solenoid part 3, which will be described later.

[0052] like Figure 5 As shown in FIG. 1 , the yoke 4 is in a substantially cubic shape with the front side open. The yoke 4 is composed of the following parts: a bottom plate 4A, which is placed on the upper end surface 23a of the cylindrical portion 23 of the housing 2 and the upper end surface 70a of the adapter 70 (see FIG. 1 ). Figure 7 ); a top plate 4B, which is opposite to the bottom plate 4A; a connecting plate 4C, which connects the bottom plate 4A and the top plate 4B; and extension pieces 4D, 4E, which extend integrally from the top plate 4B.

[0053] The bottom plate 4A has an outer fitting portion 40 formed in a substantially U-shaped cutout from the front end toward the center. The outer fitting portion 40 has an arc-shaped contour of substantially the same size as the peripheral surface 83c formed between the upper annular flange 83a and the lower annular flange 83b of the winding frame 8 (see Figure 2 ) so that it can be embedded in the recessed portion 83 of the winding frame 8.

[0054] In addition, the ends of the extension pieces 4D and 4E are bent at approximately right angles toward the inside, that is, toward the bottom plate 4A, to form bent plates 42 as bent portions. That is, the extension pieces 4D and 4E are formed by a hanging plate 41 hanging from the top plate 4B and a bent plate 42 extending from the hanging plate 41 toward the inside so as to intersect the hanging plate 41.

[0055] Reference Figure 6 The bent plates 42 of the extension pieces 4D and 4E have mounting portions 42a and 42b protruding toward the front and rear sides of the hanging plate 41, respectively, and through holes 43a and 43b penetrating in the up-down direction are formed in the mounting portions 42a and 42b. The through holes 43a and 43b can be screwed with the holes 2a and 2b of the extension portion 24 of the housing 2 described later using head screws 7, respectively, and the through holes 43a and 43b are arranged at the vertices of the square in a plan view.

[0056] Next, the manufacture of the yoke 4 will be described. Figure 3 FIG. 4 shows a T-shaped plate 4' formed by a press process from a single plate and having a substantially T-shaped top view. First, two portions of the central plate of the T-shaped plate 4' are bent approximately 90 degrees, thereby forming a connecting plate 4C that stands approximately perpendicular to the bottom plate 4A and a top plate 4B that is parallel to the bottom plate 4A. Figure 4 Shape shown.

[0057] Next, from Figure 4Starting from the state shown in the figure, the ends of the extension pieces 4D and 4E are bent approximately perpendicularly relative to the bottom plate 4A to form the bent plate 42, and the pair of side pieces of the T-shaped plate 4' are bent approximately 90 degrees, thereby, the extension pieces 4D and 4E extend downward from the top plate 4B to form the hanging plate 41, and the manufacture of the yoke 4 is completed. Figure 5 At this time, the lower surface 4a of the bottom plate 4A is located slightly below the lower surface 42d of each bent plate 42. In addition, slits S recessed inward are formed at the portions adjacent to the hanging plate 41 and the bent plate 42, so that the bent plate 42 is easily bent inward.

[0058] Next, refer to Figure 2 and Figure 7 The assembly of the electromagnetic valve 1 is described. First, the solenoid 30 is arranged on the bobbin 8, and then the molded part 9 is covered. Next, the fixed iron core 31 with the O-ring 11 is inserted from the upper side into the through hole 80 of the bobbin 8 and fixed to the inner side of the bobbin 8, and the movable iron core 32 with the spring 32a and the pilot valve core 32b assembled is inserted from the lower side to unitize the solenoid part 3.

[0059] Next, the outer fitting portion 40 of the yoke 4 is fitted into the recessed portion 83 of the bobbin 8, thereby mounting the yoke 4 on the unitized solenoid portion 3. At this time, the axial position of the bobbin 8 is determined by the bottom plate 4A of the yoke 4, and the axial position of the fixed core 31 is determined so that the upper end abuts against the lower surface of the top plate 4B of the yoke 4.

[0060] On the other hand, in the housing 2, after the diaphragm 55 is installed on the base 51 and the main valve portion 50 is formed, the outer peripheral portion of the diaphragm 55 is placed on the bottom surface of the opening recess 2C, and the outer peripheral wall of the lower side recess 71 of the connector 70 is placed on the outer peripheral portion of the diaphragm 55.

[0061] Then, the O-ring 10 is mounted below the lower annular flange 83b of the bobbin 8 and inserted into the upper recess 72 of the adapter 70. At this time, the bottom plate 4A of the yoke 4 is in contact with the upper end surface 70a of the adapter 70 and supported.

[0062] Finally, refer to Figure 6 , align the through holes 43a, 43b of the mounting parts 42a, 42b of the bent plate 42 with the tapped internal threaded holes 2a, 2b of the extension part 24 of the housing 2, respectively, and screw the head screws 7 into the holes 2a, 2b from above, respectively. As a result, the outer peripheral end of the diaphragm 55 is clamped by the peripheral wall of the lower side recess 71 and the bottom surface of the opening recess 2C, and the main valve part 50 is fixed to the opening recess 2C. In this way, the assembly of the solenoid valve 1 is completed.

[0063] At this time, refer to Figure 2 The yoke 4 is formed so that the lower surface 4a of the bottom plate 4A is located slightly below the lower surface 42d of the bending plate 42. Therefore, when the yoke 4 is fixed to the housing 2 by the head screws 7, the bottom plate 4A is slightly bent and deformed upward, so that the bottom plate 4A does not float from the housing 2, thereby improving the assembly accuracy of the solenoid valve 1.

[0064] In addition, due to the reaction force generated by the slight upward bending deformation of the bottom plate 4A, the force of the adapter 70 pressing the diaphragm 55 toward the main valve portion 50 increases, thereby preventing the diaphragm 55 from coming out. In addition, the lower surface 4a of the bottom plate 4A and the lower surface 42d of the bent plate 42 can also be made substantially at the same height.

[0065] When the yoke 4 is fixed to the housing 2 , the inner end surface 42 c of the bent plate 42 and the end surface 4 b of the bottom plate 4A facing the end surface 42 c are arranged at substantially the same height position.

[0066] Here, since the yoke 4 is formed by bending a T-shaped plate 4' formed from a single plate, the end surface 42c of the bent plate 42 and the end surface 4b of the bottom plate 4A are arranged close to each other with a small gap therebetween in the vertical direction.

[0067] As a result, the end surface 42c of the bent plate 42 and the end surface 4b of the bottom plate 4A face each other at a relatively close distance and have a relatively large area, so that a magnetic path is easily formed therebetween.

[0068] The term "close" here also includes contact, and the dimension between the end surface 42c of the bent plate 42 and the end surface 4b of the bottom plate 4A is preferably greater than or equal to 0 mm and less than or equal to the thickness of the bent plate 42 and the bottom plate 4A.

[0069] Here, in the structure where the bending plate is bent outward, the chamfered surface of the rounded corner is arranged opposite to the end surface of the bottom plate along with the bending, so although a part of the chamfered surface is arranged close to the end surface of the bottom plate, it is separated from the end surface of the bottom plate as it moves downward. As a result, it is difficult to form a magnetic circuit along the entire vertical direction between the chamfered surface and the end surface of the bottom plate.

[0070] In addition, if the structure is that the bending plate is bent outward, the size of the mounting portion formed on the outside of the hanging plate will be added to the plate thickness of the hanging plate. However, if the structure is that the bending plate 42 is bent inward as in the present embodiment, the yoke 4 can be formed more compactly than the structure in which the bending plate is bent outward.

[0071] In addition, if Figure 1 , Figure 2 , Figure 7As shown, the yoke 4 is configured to cover the upper surface, both side surfaces, back surface, and bottom surface of the solenoid portion 3, thereby protecting the solenoid portion 3 from external forces as an outer shell, and allowing the magnetic flux generated by supplying power to the solenoid 30 to form a magnetic circuit within the yoke 4 composed of magnetic material, thereby enabling the movable iron core 32 to be attracted to the fixed iron core 31 with less electric power.

[0072] As described above, the yoke 4 includes the bottom plate 4A, the top plate 4B, the connecting plate 4C, and the extension pieces 4D and 4E placed on the housing 2. The extension pieces 4D and 4E include the hanging plate 41 hanging from the top plate 4B as a hanging part, and the bent plate 42 extending from the hanging plate 41 to the bottom plate 4A side and having the mounting parts 42a and 42b mounted on the housing 2 as a bent part. Therefore, the extension pieces 4D and 4E extending from the top plate 4B of the yoke 4 are supported by the housing 2 in addition to being supported by the connecting plate 4C, so that the top plate 4B is not easily deformed. In addition, the extension pieces 4D and 4E cooperate with the connecting plate 4C to form a magnetic circuit, thereby improving the magnetic efficiency.

[0073] In this way, since the rigidity of the yoke 4 is high, the top plate 4B is not easily deformed even if a force is applied to the yoke 4 from the outside of the solenoid valve 1. In addition, even if the fluid pressure in the housing 2 is high when the water supply is cut off and the force generated by the fluid pressure causes the fixed iron core 31 to exert an upward force on the yoke 4, the top plate 4B is not easily deformed. Furthermore, even if the fixed iron core 31 and the movable iron core 32 are attracted to each other with the opening and closing action of the solenoid valve 1, the top plate 4B is not easily deformed.

[0074] Furthermore, since the extending pieces 4D and 4E are arranged at positions not facing the connecting plate 4C, the top plate 4B is less likely to be deformed by external forces from multiple directions.

[0075] Furthermore, at least a pair of extension pieces 4D and 4E are provided, and the pair of extension pieces extend from the top plate 4B of the yoke 4 in a mutually opposing manner, so that the extension pieces 4D and 4E can be fixed to the housing 2 respectively, and the top plate 4B can be less likely to deform due to external forces.

[0076] In addition, the lower end of the bottom plate 4A is arranged between the upper end and the lower end of the extension pieces 4D and 4E, so the bottom plate 4A is close to the extension pieces 4D and 4E. Therefore, a magnetic circuit is formed by the top plate 4B, the extension pieces 4D and 4E and the bottom plate 4A, thereby improving the magnetic efficiency.

[0077] Furthermore, the end surface 42c of the bent plate 42 is disposed opposite to the end surface 4b of the bottom plate 4A. The end surface 42c of the bent plate 42 and the end surface 4b of the bottom plate 4A are disposed close to each other in the entire vertical direction, thereby improving the magnetic efficiency.

[0078] Furthermore, the thickness of the bent plate 42 of the extension piece 4D is substantially the same as the thickness of the bottom plate 4A, and the yoke 4 can be manufactured from a single plate, so the number of components constituting the yoke 4 is reduced.

[0079] In addition, the extending piece 4D has the mounting portions 42 a and 42 b of the bent plate 42 disposed at positions away from the hanging plate 41 in the front-rear direction. Therefore, the yoke 4 can be fixed to the housing 2 from above, making it easy to mount the yoke 4 to the housing 2 .

[0080] Furthermore, the mounting portions 42a and 42b of the bent plate 42 are respectively arranged at a position away from the hanging plate 41 in the front and at a position away from the hanging plate 41 in the rear, so that the mounting strength of the yoke 4 with respect to the housing 2 can be improved. Furthermore, the through holes 43a and 43b of each mounting portion 42a and 42b are arranged at each vertex portion of a square in a plan view, that is, arranged at approximately equal intervals in the circumferential direction and arranged on a diagonal line, so that it is easy to disperse the external force acting on the yoke 4 approximately evenly to each head screw 7, thereby further improving the mounting strength.

[0081] In addition, the mounting portions 42a and 42b of the bent plate 42 are respectively arranged at positions away from the hanging plate 41 forward and backward, that is, at positions away from the magnetic circuit formed by the bottom plate 4A, the bent plate 42, the hanging plate 41, and the top plate 4B, thereby preventing the mounting portions 42a, 42b and the head screws 7 from obstructing the formation of the magnetic circuit.

[0082] As mentioned above, although the embodiment of the present invention is described based on the drawings, the specific structure is not limited to these embodiments, and even if there are changes and additions within the scope that does not depart from the gist of the present invention, they are also included in the present invention.

[0083] For example, the solenoid valve 1 is illustrated as a pilot type having a pilot valve core 32b and a main valve portion 50, but is not limited to this. For example, similar to the pilot valve core 32b of the above-mentioned embodiment, it can also be a solenoid valve having a valve core that can move forward and backward in the axial direction by supplying power to or stopping the supply of power to the terminal 91, and closing the valve by the valve core seating on the valve seat, that is, it is not limited to the pilot type.

[0084] In addition, in the above embodiment, an ON-OFF type and normally closed electromagnetic valve is exemplified, which is in an open valve state by supplying power and in a closed valve state by supplying power, but it is not limited thereto, and it may be an ON-OFF type and normally open electromagnetic valve which is in an open valve state by supplying power and in a closed valve state by supplying power, or it may be an electromagnetic valve which can adjust the separation distance between the valve core and the valve seat according to the amount of power supplied, thereby adjusting the valve opening degree. That is, the form of the electromagnetic valve to which the yoke 4 of the above embodiment is applied is not limited.

[0085] Furthermore, in the above embodiment, the manufacturing sequence of the yoke 4 is described as standing the connecting plate 4C from the bottom plate 4A and bending it so that the top plate 4B is parallel to the bottom plate 4A, but this is not limited thereto, and the extending plates 4D and 4E may be stood up first.

[0086] In addition, in the above-mentioned embodiment, a method of processing a T-shaped plate 4' formed by stamping and having a substantially T-shaped shape in a plan view is exemplified, but the present invention is not limited thereto, and the yoke 4 may be formed by casting or injection molding, or may be formed by connecting plates formed by stamping from a single plate by welding, etc., or may be formed by adding separate parts to the yoke 4 of the present embodiment. In particular, any manufacturing method may be applied as long as the end surface of the bent portion and the end surface of the bottom plate can be arranged close to each other in the entire vertical direction.

[0087] Furthermore, in the above-described embodiment, the yoke 4 is screwed and fixed to the housing 2 using the head screws 7 , but the present invention is not limited thereto, and the yoke 4 may be fixed to the housing 2 by welding or concave-convex fitting.

[0088] In the embodiment, the bottom plate 4A of the yoke 4 is arranged at approximately the same height as the lower ends of the bent plate 42 and the extension pieces 4D and 4E, but the present invention is not limited thereto. The lower ends of the bent portions and the extension pieces may be arranged below the bottom plate.

[0089] Furthermore, in the above-described embodiment, two extension pieces are extended from the top plate 4B, but the present invention is not limited thereto, and one piece or three or more extension pieces may be provided.

[0090] In addition, in the above-mentioned embodiment, the extension piece 4D is bent to form the bent plate 42, and the head screw 7 is inserted into the through holes 43a and 43b from the upper side and fixed to the housing 2, but it is not limited to this. The head screw can also be inserted into the through hole from the side and screwed into the hole of the housing to fix it. The through hole extends to the side of the extension piece extending vertically downward from the top plate, and the head screw can be inserted from the axial lower side of the through hole formed in the housing and penetrated in the vertical direction, and screwed into the internal thread part formed on the mounting piece and the nut separated from the mounting piece to fix it to the housing. Furthermore, one mounting part can be inserted into the slit of the housing, and the head screw can be inserted into the through hole formed on the other mounting part of the bent part and screwed into the hole of the housing to fix it. The mounting method of the mounting part relative to the housing can also be appropriately changed.

[0091] Furthermore, in the above-described embodiment, the mounting portions 42 a and 42 b are located at the vertices of a square in a plan view, but the present invention is not limited thereto, and at least one mounting portion may be formed on the bent plate 42 .

[0092] In the above embodiment, the yoke 4 is exemplified as a substantially cubic shape with the front side open, but the present invention is not limited thereto. A yoke may also be one in which the top plate is substantially circular and includes an arc-shaped extension piece and a connecting plate (see FIG. Figure 8 ).

[0093] Explanation of symbols

[0094] 1: Solenoid valve;

[0095] 2: Shell;

[0096] 3: Solenoid part;

[0097] 4: Magnetic yoke;

[0098] 4A: bottom plate;

[0099] 4B: top plate;

[0100] 4C: Connecting plate;

[0101] 4D, 4E: extension piece;

[0102] 4b: end surface (end surface of the bottom plate);

[0103] 21: Inflow channel;

[0104] 22: outflow pathway;

[0105] 30: Solenoid;

[0106] 31: Fixed core;

[0107] 32: movable iron core;

[0108] 32b: pilot valve core;

[0109] 41: hanging plate (hanging part);

[0110] 42: bending plate (bending portion);

[0111] 42a, 42b: mounting portion;

[0112] 42c: end surface (end surface of the hanging part);

[0113] 50: Main valve part (main valve core).

Claims

1. A solenoid valve, comprising: a housing having an inflow passage and an outflow passage for a fluid; a solenoid portion having a solenoid, a fixed iron core, a movable iron core and a valve core; and a yoke made of a magnetic material, surrounding the solenoid portion and mounted on the housing, wherein: The yoke includes: a bottom plate placed on the housing; a top plate; a connecting plate connecting the bottom plate and the top plate; and an extending piece extending downward from the top plate as a whole. The extension piece includes: a hanging portion hanging down from the top plate; and a bent portion having a mounting portion mounted on the housing. The bent portion is bent from the hanging portion toward the inner side of the yoke so that an end surface of the bent portion is arranged opposite to an end surface of the bottom plate.

2. The solenoid valve according to claim 1, wherein: At least one pair of the extending pieces is provided, and the pair of extending pieces extend from the top plate of the yoke in a manner facing each other.

3. The solenoid valve according to claim 1 or 2, wherein: The thickness of the bent portion is substantially the same as the thickness of the bottom plate.

4. The solenoid valve according to claim 1 or 2, wherein: The mounting portion is arranged at a position away from the hanging portion in the front-rear direction.

5. The solenoid valve according to claim 4, wherein: The mounting portion is disposed at a position spaced apart from the hanging portion forward and spaced apart from the hanging portion rearward, respectively.

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