Electrically operated valve

Abstract

To provide a low-cost electric drive valve capable of inhibiting fluid from acting on a valve body in the valve open state, as well as, capable of inhibiting generation of foreign matters.SOLUTION: A solenoid valve 1 includes a cylindrical valve body housing member 70. A first part 71 of the valve body housing member 70 is provided with a housing space 74 for housing a valve body 20 in a valve open state. A second part 72 of the valve body housing member 70 is provided with a plurality of elastic pieces 75, which are divided in a peripheral direction by a plurality of slits 76. The plurality of elastic pieces 75 are inserted into a fixed iron core 50 so that the plurality of elastic pieces 75 is elastically deformed inward.SELECTED DRAWING: Figure 2

Description

[Technical field]

[0001] The present invention relates to an electrically operated valve. [Background technology]

[0002] Patent Document 1 discloses a solenoid valve, which is an example of a conventional electrically driven valve. The solenoid valve of Patent Document 1 has a housing, a valve body, and a movable collar member. The valve body is disposed in a valve chamber of the housing and opens and closes a valve port. The movable collar member has a cylindrical portion and a flange portion. The cylindrical portion is disposed so as to surround the valve body in an open state. The flange portion is connected to an upper end portion of the cylindrical portion. The lower surface of the flange portion is in slidable contact with the housing. In the solenoid valve, the movable collar member suppresses the action of the fluid in the valve chamber on the valve body, thereby reducing vibration of the valve body. [Prior art documents] [Patent documents]

[0003] [Patent Document 1] JP 2004-239358 A Summary of the Invention [Problem to be solved by the invention]

[0004] In the above-mentioned solenoid valve, the movable collar member is not fixed to the housing, but is pressed against the housing by a spring. Therefore, there is a risk of foreign matter such as metal powder being generated by sliding between the flange portion and the housing. In addition, there is a problem that the manufacturing cost increases if the movable collar member is fixed by welding or brazing.

[0005] SUMMARY OF THE PRESENT DISCLOSURE An object of the present invention is to provide a low-cost electrically driven valve that can suppress the action of fluid on the valve body when the valve is open and also suppress the generation of foreign matter. [Means for solving the problem]

[0006] In order to achieve the above-mentioned object, the electrically driven valve of the present invention is an electrically driven valve having a valve body having a valve seat, a valve element which moves toward and away from the valve seat, a plunger housed in the valve body, a valve stem connecting the valve element and the plunger, a cylindrical fixed iron core which is arranged between the valve element and the plunger and into which the valve stem is inserted, an electromagnetic coil arranged on the outside of the valve body, and a cylindrical valve element accommodating member, wherein one end of the valve element accommodating member is provided with an accommodating space which accommodates the valve element in an open state, and the other end of the valve element accommodating member is provided with a plurality of elastic pieces, the plurality of elastic pieces being inserted inside the fixed iron core, or the fixed iron core being inserted inside the plurality of elastic pieces, and the valve element accommodating member being fixed to the fixed iron core by the plurality of elastic pieces.

[0007] According to the present invention, the electrically driven valve has a valve body accommodating member having a cylindrical shape. One end of the valve body accommodating member is provided with an accommodating space for accommodating the valve body in an open state. The other end of the valve body accommodating member is provided with a plurality of elastic pieces. The plurality of elastic pieces are inserted inside the fixed iron core, or the fixed iron core is inserted inside the plurality of elastic pieces. The valve body accommodating member is fixed to the fixed iron core by the plurality of elastic pieces. In this way, the valve body accommodating member is fixed to the fixed iron core by, for example, a plurality of elastic pieces constituting a press-fit structure or a concave-convex structure, and the valve body accommodating member can be fixed to the fixed iron core with a simple structure. Therefore, the electrically driven valve can suppress the action of the fluid on the valve body in an open state at low cost and suppress the generation of foreign matter.

[0008] In the present invention, it is preferable that the multiple elastic pieces are formed by dividing the other end of the valve body accommodating member in the circumferential direction by multiple slits. In this way, the multiple elastic pieces can be relatively easily formed on the other end of the valve body accommodating member.

[0009] In the present invention, it is preferable that the multiple elastic pieces are inserted inside the fixed core so that the multiple elastic pieces elastically deform inward, and the multiple elastic pieces are inclined with respect to the axial direction of the valve body accommodating member so that their tips are positioned outside their base ends before the elastic deformation. In this way, the diameter of the inner peripheral surface of the fixed core is made the same as the outer diameter of the valve body accommodating member at the location of the base ends of the multiple elastic pieces, and the multiple elastic pieces are inserted inside the fixed core, so that the multiple elastic pieces can be elastically deformed inward. Therefore, it is not necessary to provide a tapered surface or a convex portion for elastically deforming the multiple elastic pieces on the inner peripheral surface of the fixed core, and the fixed core can be made into a relatively simple shape.

[0010] In the present invention, it is preferable that the multiple elastic pieces are inserted inside the fixed core so that the multiple elastic pieces are elastically deformed inward, that the inner peripheral surface of the fixed core is provided with anti-removal recesses, and that the outer peripheral surfaces of the multiple elastic pieces are provided with anti-removal protrusions that engage with the anti-removal recesses so as to restrict movement of the multiple elastic pieces in a direction to come out from the inside of the fixed core. In this way, the anti-removal protrusions engage with the anti-removal recesses, thereby preventing the valve body accommodating member from falling off from the fixed core.

[0011] In the present invention, it is preferable that the elastic pieces are inserted inside the fixed core so that the elastic pieces are elastically deformed inward, the valve body accommodating member has a first part having a cylindrical shape, a second part having a cylindrical shape with an outer diameter smaller than that of the first part, and a third part having an annular flat plate shape connecting the first part and the second part, the first part being the one end where the accommodating space is provided, the second part being the other end where the elastic pieces are provided, and the surface of the third part on the second part side is in contact with the end surface of the fixed core on the valve seat side. In this way, the anti-removal protrusion is engaged with the anti-removal recess to restrict the movement of the elastic pieces in the direction of coming out of the inside of the fixed core, and the end surface of the fixed core on the valve seat side and the surface of the third part on the second part side are in contact with each other to restrict the movement of the elastic pieces in the direction of inserting them into the inside of the fixed core. Therefore, the movement (rattle) of the valve body accommodating member can be suppressed, and the generation of foreign matter can be more effectively suppressed.

[0012] In the present invention, it is preferable that an anti-rotation recess is provided on the end face of the fixed core facing the valve seat, and an anti-rotation protrusion that engages with the anti-rotation recess so as to restrict rotation of the valve body accommodating member around the axis is provided on the face of the third portion facing the second portion. In this way, the anti-rotation protrusion engages with the anti-rotation recess, thereby restricting rotation of the valve body accommodating member around the axis and more effectively suppressing generation of foreign matter.

[0013] In the present invention, it is preferable that the fixed core is inserted inside the elastic pieces so that the elastic pieces elastically deform outward, and that the elastic pieces are inclined with respect to the axial direction of the valve body accommodating member so that their tips are located inside their base ends before the elastic deformation. By doing so, the diameter of the outer circumferential surface of the fixed core is made the same as the inner diameter of the valve body accommodating member at the location of the base ends of the elastic pieces, and the fixed core is inserted inside the elastic pieces, so that the elastic pieces can be elastically deformed outward. Therefore, it is not necessary to provide a tapered surface or a convex portion for elastically deforming the elastic pieces on the outer circumferential surface of the fixed core, and the fixed core can be made into a relatively simple shape.

[0014] In the present invention, it is preferable that the fixed core is inserted inside the elastic pieces so that the elastic pieces are elastically deformed outward, a retaining recess is provided on the outer peripheral surface of the fixed core, and a retaining protrusion that engages with the retaining recess is provided on the inner surface of the elastic pieces so as to restrict movement of the fixed core in the elastic pieces in a direction in which it comes out from inside the elastic pieces. In this way, the retaining protrusion engages with the retaining recess, thereby preventing the valve body accommodating member from falling off from the fixed core.

[0015] In the present invention, it is preferable that the valve body is provided with a fixing protrusion that contacts a tip of at least one of the elastic pieces and engages with the retaining recess, thereby making it possible to fix the fixed core to the valve body and more effectively prevent the valve body accommodating member from falling off from the fixed core. Effect of the Invention

[0016] According to the present invention, the action of fluid on the valve body in the open valve state can be suppressed at low cost, and the generation of foreign matter can be suppressed. [Brief description of the drawings]

[0017] [Figure 1]1 is a cross-sectional view of a solenoid valve according to a first embodiment of the present invention. [Diagram 2] 2 is an enlarged cross-sectional view of a portion of the solenoid valve of FIG. 1. [Diagram 3] 2 is a diagram showing a valve body accommodating member of the solenoid valve of FIG. 1. [Figure 4] 2 is a view showing a valve body accommodating member of the solenoid valve of FIG. 1 (continuation). [Diagram 5] 2 is an enlarged cross-sectional view of a portion of a solenoid valve according to a first modified example of the solenoid valve of FIG. 1. FIG. [Figure 6] 6 is a diagram showing a valve body accommodating member of the solenoid valve of FIG. 5. FIG. [Figure 7] 6 is a view showing the valve body accommodating member of the solenoid valve of FIG. 5 (continuation). [Figure 8] 1. FIG. 4 is an enlarged cross-sectional view of a portion of a solenoid valve according to a second modified example of the solenoid valve of FIG. [Figure 9] 9 is a diagram showing a valve body accommodating member of the solenoid valve of FIG. 8. FIG. [Figure 10] 9 is a view showing the valve body accommodating member of the solenoid valve of FIG. 8 (continuation). [Figure 11] FIG. 6 is an enlarged cross-sectional view of a portion of a solenoid valve according to a second embodiment of the present invention. [Figure 12] 12 is a diagram showing a valve body accommodating member of the solenoid valve of FIG. 11. FIG. [Figure 13] 12 is a view showing the valve body accommodating member of the solenoid valve of FIG. 11 (continuation). [Figure 14] 12 is an enlarged cross-sectional view of a part of a solenoid valve according to a first modified example of the solenoid valve of FIG. 11. FIG. [Figure 15] 12 is an enlarged cross-sectional view of a part of a solenoid valve according to a second modified example of the solenoid valve of FIG. 11. FIG. [Figure 16] 12 is an enlarged cross-sectional view of a portion of a solenoid valve according to a third modified example of the solenoid valve of FIG. 11. FIG. DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS

[0018] (First embodiment) A solenoid valve according to a first embodiment of an electrically driven valve of the present invention will now be described with reference to Figs.

[0019] FIG. 1 is a cross-sectional view of a solenoid valve according to a first embodiment of the present invention. FIG. 2 is an enlarged cross-sectional view of a valve body accommodating member of the solenoid valve of FIG. 1 and its vicinity. In FIG. 2, the magnetic coil is omitted. FIG. 3 and FIG. 4 are diagrams showing the valve body accommodating member of the solenoid valve of FIG. 1. FIG. 3(a) is a front view of the valve body accommodating member. FIG. 3(b) is a plan view of the valve body accommodating member. FIG. 4(a) is a cross-sectional view taken along line IVA-IVA in FIG. 3(b). FIG. 4(b) is an enlarged view of a portion surrounded by a two-dot chain rectangle in FIG. 4(a).

[0020] As shown in Figures 1 and 2, the solenoid valve 1 of this embodiment has a valve body 10, a valve body 20, a plunger 30, a valve shaft 40, a fixed core 50 (also called an "attractor"), an electromagnetic coil 60, and a valve body accommodating member 70.

[0021] The valve body 10 includes a valve body member 11 and a valve seat member 12 (also referred to as a "seat body"). The valve body member 11 and the valve seat member 12 are made of a metal such as stainless steel.

[0022] The valve body member 11 has a small diameter portion 11a and a large diameter portion 11b. The small diameter portion 11a has a cylindrical shape with a closed upper end. The large diameter portion 11b has a cylindrical shape with an outer diameter larger than that of the small diameter portion 11a. The large diameter portion 11b is integrally connected coaxially to the lower end of the small diameter portion 11a. The valve body 10 has a stepped cylindrical shape.

[0023] The valve seat member 12 has a cylindrical portion 12a and a flange portion 12b. The flange portion 12b is integrally connected to the lower end portion of the cylindrical portion 12a. A valve seat 13 is provided on an upper end surface 12c of the cylindrical portion 12a. The valve seat 13 is an inwardly tapered annular surface whose diameter decreases from top to bottom. The cylindrical portion 12a is disposed inside the large diameter portion 11b of the valve body member 11. The flange portion 12b is joined to the large diameter portion 11b.

[0024] A valve chamber 14 is provided inside the large diameter portion 11b of the valve body member 11. A cylindrical portion 12a of the valve seat member 12 is disposed in the valve chamber 14. A valve port 15 is provided inside the cylindrical portion 12a. The valve port 15 is surrounded by the valve seat 13 and opens into the valve chamber 14. A first conduit 91, which is a circular pipe, is joined to the large diameter portion 11b of the valve body member 11. The first conduit 91 is connected to the valve chamber 14. A second conduit 92, which is a circular pipe, is joined to the valve seat member 12. The second conduit 92 is connected to the valve port 15. The first conduit 91 is an inlet pipe. The second conduit 92 is an outlet pipe.

[0025] The valve element 20 has a circular cap shape in a plan view. The valve element 20 is made of metal such as brass or stainless steel. When the valve element 20 comes into contact with the valve seat 13, the valve orifice 15 closes and the valve is in a closed state. When the valve element 20 moves away from the valve seat 13, the valve orifice 15 opens and the valve is in an open state. The valve element 20 opens and closes the valve seat 13 (i.e., the valve orifice 15). In this embodiment, the valve element 20 coming into contact with the valve seat 13 and the valve element 20 closing the valve seat 13 are synonymous.

[0026] The plunger 30 has a cylindrical shape and is accommodated in the small diameter portion 11a of the valve body member 11 so as to be movable in the up-down direction (the direction of the first axis L1).

[0027] The valve shaft 40 has a cylindrical shape. The diameter of the valve shaft 40 is smaller than the diameter of the valve body 20. The lower end of the valve shaft 40 is integrally connected to the upper end of the valve body 20. The valve body 20 and the valve shaft 40 are made of a metal such as brass or stainless steel. The upper end of the valve shaft 40 is connected to the lower end of the plunger 30 by crimping. The valve shaft 40 connects the valve body 20 and the plunger 30.

[0028] The fixed core 50 has a cylindrical shape. The fixed core 50 is disposed under the small diameter portion 11a of the valve body member 11. The fixed core 50 is disposed between the valve body 20 and the plunger 30. The valve shaft 40 is inserted inside the fixed core 50 so as to be movable in the vertical direction. The plunger spring 35 is disposed between the fixed core 50 and the plunger 30. The plunger spring 35 is a compression coil spring. The plunger spring 35 pushes the plunger 30 upward (in the direction in which the valve body 20 moves away from the valve seat 13).

[0029] The fixed core 50 has a groove-shaped fixing recess 56 extending over the entire circumferential direction on its outer peripheral surface 50a. The small diameter portion 11a has a fixing protrusion 16 protruding inward. The fixing protrusion 16 is formed by crimping or punching the small diameter portion 11a from the outside. The fixing protrusion 16 engages with the fixing recess 56, thereby fixing the fixed core 50 to the small diameter portion 11a.

[0030] The inner peripheral surface 50b of the fixed core 50 is provided with a groove-shaped anti-rotation recess 57 extending over the entire circumferential direction. The anti-rotation recess 57 may be a plurality of holes spaced apart in the circumferential direction. A rotation prevention recess 58 is provided in the lower end surface 50c of the fixed core 50 (the end surface of the fixed core 50 facing the valve seat 13). The rotation prevention recess 58 is a circular hole. In this embodiment, two rotation prevention recesses 58 are provided at 180 degree intervals in the circumferential direction.

[0031] The electromagnetic coil 60 has a cylindrical shape. The small diameter portion 11a of the valve body member 11 is inserted inside the electromagnetic coil 60. When electricity is applied to the electromagnetic coil 60, a force (magnetic force) acts on the plunger 30 to move it downward (in the direction in which the valve body 20 approaches the valve seat 13), and the plunger 30 moves downward against the upward pushing force of the plunger spring 35, and the valve body 20 comes into contact with the valve seat 13.

[0032] When the valve element 20 comes into contact with the valve seat 13, a pressure difference ΔP between the fluid pressure in the valve chamber 14 and the fluid pressure in the valve port 15 acts on the area S of the inside of the part of the valve element 20 that comes into contact with the valve seat 13, generating a force that presses the valve element 20 downward. Therefore, by appropriately setting the set load of the plunger spring 35, the area S, etc., when the pressure difference ΔP is equal to or greater than a predetermined valve-closed maintaining pressure Pc in the closed valve state, the valve-closed state can be maintained even if the supply of current to the electromagnetic coil 60 is stopped.

[0033] As shown in Figs. 3 and 4, the valve body accommodating member 70 has a first portion 71, a second portion 72, and a third portion 73. The first portion 71 has a cylindrical shape. The first portion 71 is disposed at a distance from the cylindrical portion 12a in the up-down direction. The second portion 72 has a cylindrical shape with an outer diameter smaller than that of the first portion 71. The third portion 73 connects the first portion 71 and the second portion 72. The first portion 71 is one end of the valve body accommodating member 70. The second portion 72 is the other end of the valve body accommodating member 70. The outer peripheral edge of the third portion 73 is integrally connected to the upper end of the first portion 71. The inner peripheral edge of the third portion 73 is integrally connected to the lower end of the second portion 72. The valve body accommodating member 70 is made of a metal such as stainless steel.

[0034] The inner diameter of the first portion 71 is slightly larger than the outer diameter of the valve body 20. An accommodation space 74 is provided inside the first portion 71. The valve body 20 is disposed in the accommodation space 74 in the open valve state. In this embodiment, the valve body 20 is disposed outside the accommodation space 74 in the closed valve state. The first portion 71 may have a configuration in which the lower end of the first portion 71 extends close to the valve seat member 12 so that the valve body 20 is disposed in the accommodation space 74 even in the closed valve state. In this configuration, the first portion 71 guides the movement of the valve body 20 from the open valve state to the closed valve state.

[0035] The inner diameter of the second portion 72 is slightly larger than the outer diameter of the valve stem 40. The valve stem 40 is inserted inside the second portion 72. The second portion 72 supports the valve stem 40 so that it can move up and down.

[0036] The second portion 72 is provided with a plurality of elastic pieces 75 that are divided in the circumferential direction by a plurality of slits 76 extending downward from the upper end thereof. That is, the plurality of elastic pieces 75 are formed by dividing the second portion 72 in the circumferential direction by the plurality of slits 76. In this embodiment, three elastic pieces 75 are provided. Three slits 76 are provided at intervals of 120 degrees in the circumferential direction. The plurality of elastic pieces 75 are arranged so as to be aligned in the circumferential direction of the second portion 72.

[0037] Each of the elastic pieces 75 has a tip 75a disposed outside (radially outward) from a base end 75b before elastic deformation (i.e., when no external force is applied). In this embodiment, the elastic pieces 75 are inclined at an angle α (α is preferably about 1 to 5 degrees) with respect to the vertical direction. In FIG. 4(b), a line M1 is a straight line parallel to the first axis L1. The outer diameter of the portion where the base end 75b of the elastic pieces 75 is located in the second portion 72 is the same as the diameter of the inner peripheral surface 50b of the fixed core 50 (specifically, the diameter of the portion where the elastic pieces 75 are inserted on the inner peripheral surface 50b of the fixed core 50), but strictly speaking, it is preferable that the outer diameter is slightly smaller than the diameter of the inner peripheral surface 50b.

[0038] The outer side surface 75c of the elastic pieces 75 is provided with a retaining protrusion 77. The retaining protrusion 77 has a generally hemispherical shape. The retaining protrusion 77 is disposed on the outer side surface 75c of each of the elastic pieces 75 at a position in the center in the width direction (circumferential direction) and near the tip 75a. When the elastic pieces 75 are inserted inside the fixed core 50, the retaining protrusion 77 enters the retaining recess 57 of the fixed core 50 and engages with the retaining recess 57. The retaining protrusion 77 engages with the retaining recess 57, thereby restricting the movement of the elastic pieces 75 downward (in the direction of coming out from the inside of the fixed core 50). In addition, when the retaining protrusion 77 engages with the retaining recess 57, the upper surface 73c of the third portion 73 (the surface of the third portion 73 on the second portion 72 side) is in contact with the lower end surface 50c of the fixed core 50. The upper surface 73c of the third portion 73 comes into contact with the lower end surface 50c of the fixed core 50, thereby restricting the upward movement (in the direction of insertion into the fixed core 50) of the multiple elastic pieces 75. In this embodiment, the multiple elastic pieces 75 are configured so that when inserted into the fixed core 50, they elastically deform inwardly, so that the angle α becomes 0. As a result, the outer surfaces 75c of the multiple elastic pieces 75 are pressed against the inner circumferential surface 50b of the fixed core 50.

[0039] In this embodiment, the elastic piece 75 is formed such that the tip 75a is disposed outside the base end 75b before elastic deformation, and the elastic piece 75 constantly presses the inner peripheral surface 50b of the fixed core 50 outward. However, the elastic piece 75 may be formed such that the tip 75a and the base end 75b are aligned in the vertical direction (i.e., the elastic piece 75 is parallel to the vertical direction) before elastic deformation, or the tip 75a may be disposed inside (inward in the radial direction) than the base end 75b. In these cases, even if the retaining protrusion 77 of the elastic piece 75 does not constantly press the bottom surface of the retaining recess 57 outward, the valve body accommodating member 70 can be fixed to the fixed core 50 as long as the retaining protrusion 77 is inserted into the retaining recess 57. However, if the retaining protrusion 77 of the elastic piece 75 is configured to constantly press the bottom surface of the retaining recess 57 outward, rattling of the valve body accommodating member 70 can be prevented. Furthermore, it is more preferable that the elastic piece 75 is formed so that the curved portion on the lower side (valve seat 13 side) of the retaining protrusion 77 abuts against the lower end of the retaining recess 57. In this way, the elasticity of the elastic piece 75 causes the retaining protrusion 77 to move upward, so that the upper surface 73c of the third portion 73 is constantly pressed against the lower surface of the fixed core 50, preventing the valve body accommodating member 70 from rattling.

[0040] The upper surface 73c of the third portion 73 is provided with a rotation-stopping protrusion 78. The rotation-stopping protrusion 78 has a generally hemispherical shape. In this embodiment, two rotation-stopping protrusions 78 are provided at 180-degree intervals in the circumferential direction. The rotation-stopping protrusions 78 are arranged so as to enter the rotation-stopping recesses 58 when the upper surface 73c of the third portion 73 contacts the lower end surface 50c of the fixed core 50. The rotation-stopping protrusions 78 engage with the rotation-stopping recesses 58, thereby restricting the rotation of the valve body accommodating member 70 around the first axis L1. In a configuration in which the retaining recesses 57 are a plurality of holes arranged at intervals in the circumferential direction, the rotation of the valve body accommodating member 70 around the first axis L1 is similarly restricted by the retaining protrusions 77 engaging with the retaining recesses 57. In this configuration, the rotation-stopping recesses 58 and the rotation-stopping protrusions 78 may be omitted.

[0041] In the solenoid valve 1, the valve body 10 (valve body member 11, cylindrical portion 12a, valve seat 13, valve port 15), valve element 20, plunger 30, valve shaft 40, fixed core 50, valve element accommodating member 70, and second conduit 92 are arranged such that their respective central axes are on the first axis L1 (i.e., arranged to coincide with the first axis L1). Also, in the solenoid valve 1, the first conduit 91 is arranged such that its central axis is on the second axis L2 (i.e., arranged to coincide with the second axis L2). The second axis L2 is perpendicular to the first axis L1.

[0042] Next, an example of the operation of the above-mentioned solenoid valve 1 will be described.

[0043] When the electromagnetic coil 60 is energized, the plunger 30 moves downward due to magnetic force. The valve stem 40 and the valve body 20 move downward together with the plunger 30. The valve body 20 comes into contact with the valve seat 13, and the solenoid valve 1 is brought into a closed state.

[0044] In the valve closed state, when the pressure difference ΔP between the fluid pressure in the valve chamber 14 and the fluid pressure in the valve port 15 is equal to or greater than the valve closed pressure Pc, the solenoid valve 1 maintains the valve closed state even when the supply of current to the electromagnetic coil 60 is stopped. When the pressure difference ΔP is smaller than the valve closed pressure Pc and the supply of current to the electromagnetic coil 60 is stopped, the plunger 30 is pushed upward by the plunger spring 31. The valve shaft 40 and valve body 20 move upward together with the plunger 30. The valve body 20 separates from the valve seat 13, and the solenoid valve 1 enters the valve open state. In the valve open state, the valve body 20 is accommodated in the accommodation space 74 of the valve body accommodating member 70.

[0045] In the open state, the fluid that flows into the valve chamber 14 from the first conduit 91 passes through the valve port 15 and flows out of the second conduit 92. In a configuration without the valve body housing member 70, the fluid flows laterally (left and right in Figs. 1 and 2) above the valve body 20, and flows into the small diameter portion 11a of the valve body member 11 through the gap between the valve stem 40 and the fixed iron core 50. This causes the fluid pressure above the plunger 30 to become greater than the fluid pressure below the valve body 20 (between the valve body 20 and the valve port 15), which may cause the plunger 30 to move downward and close the valve seat 13 (valve port 15). On the other hand, in a configuration with the valve body housing member 70, the fluid flows from below the valve body 20 through the gap between the valve body 20 and the first portion 71 of the valve body housing member 70 to above the valve body 20. Therefore, the fluid pressure above the plunger 30 is unlikely to become greater than the fluid pressure below the valve body 20, and downward movement of the plunger 30 can be suppressed. In this manner, the valve body accommodating member 70 can suppress the action of the fluid on the valve body in the open valve state.

[0046] The multiple elastic pieces 75 of the valve body accommodating member 70 are inserted inside the fixed iron core 50. The multiple elastic pieces 75 are elastically deformed inward, and the outer surface 75c of the multiple elastic pieces 75 is preferably pressed against the inner peripheral surface 50b of the fixed iron core 50. In this way, the valve body accommodating member 70 is fixed to the fixed iron core 50. In addition, the retaining protrusions 77 of the multiple elastic pieces 75 are engaged with the retaining recesses 57 of the fixed iron core 50, and the upper surface 73c of the third portion 73 of the valve body accommodating member 70 is in contact with the lower end surface 50c of the fixed iron core 50. In this way, the vertical movement of the multiple elastic pieces 75 is restricted. In addition, the rotation-stopping protrusions 78 of the valve body accommodating member 70 enter the rotation-stopping recesses 58 of the fixed iron core 50. In this way, the rotation of the valve body accommodating member 70 around the first axis L1 is restricted.

[0047] As described above, the solenoid valve 1 includes the valve body 10 having the valve seat 13, the valve element 20 that moves toward and away from the valve seat 13, the plunger 30 accommodated in the valve body 10, the valve shaft 40 that connects the valve element 20 and the plunger 30, the fixed iron core 50 that is arranged between the valve element 20 and the plunger 30 and has a cylindrical shape with the valve shaft 40 inserted inside, the electromagnetic coil 60 that is arranged outside the valve body 10, and the valve element accommodating member 70 that has a cylindrical shape. The first part 71 of the valve element accommodating member 70 is provided with an accommodating space 74 that accommodates the valve element 20 in an open state. The second part 72 of the valve element accommodating member 70 is provided with a plurality of elastic pieces 75 that are divided in the circumferential direction by a plurality of slits 76. The plurality of elastic pieces 75 are inserted inside the fixed iron core 50 so that the plurality of elastic pieces 75 are elastically deformed inward. The valve element accommodating member 70 is fixed to the fixed iron core 50 by the plurality of elastic pieces 75.

[0048] By doing so, the multiple elastic pieces 75 are pressed against the fixed core 50 by the restoring force, and the valve body accommodating member 70 can be fixed to the fixed core 50 with a simple structure. Therefore, the solenoid valve 1 can suppress the action of the fluid on the valve body 20 in the open state at low cost and suppress the generation of foreign matter.

[0049] Moreover, the multiple elastic pieces 75 are inclined with respect to the axial direction (the direction of the first axis L1) of the valve body accommodating member 70 so that the tip 75a is disposed outside the base end 75b before elastic deformation. In this way, the diameter of the inner peripheral surface 50b of the fixed core 50 is made the same as the outer diameter of the portion of the second part 72 of the valve body accommodating member 70 where the base end 75b of the multiple elastic pieces 75 is located (strictly speaking, it is preferable that the outer diameter is slightly smaller than the diameter of the inner peripheral surface 50b), and the multiple elastic pieces 75 are inserted inside the fixed core 50, so that the multiple elastic pieces 75 can be elastically deformed inward. Therefore, it is not necessary to provide a tapered surface or a convex portion for elastically deforming the multiple elastic pieces 75 on the inner peripheral surface 50b of the fixed core 50, and the fixed core 50 can be made into a relatively simple shape.

[0050] Further, the inner peripheral surface 50b of the fixed core 50 is provided with a retaining recess 57. The outer surfaces 75c of the multiple elastic pieces 75 are provided with retaining protrusions 77 that engage with the retaining recesses 57 so as to restrict downward movement of the multiple elastic pieces 75 (in the direction of coming out from the inside of the fixed core 50). In this manner, the retaining protrusions 77 engage with the retaining recesses 57, thereby preventing the valve body accommodating member 70 from falling off the fixed core 50. The solenoid valve 1 may have a configuration in which the retaining recesses 57 and the retaining protrusions 77 are omitted.

[0051] The valve body accommodating member 70 has a first portion 71 having a cylindrical shape, a second portion 72 having a cylindrical shape with an outer diameter smaller than that of the first portion 71, and a third portion 73 having an annular flat plate shape connecting the first portion 71 and the second portion 72. The first portion 71 is provided with an accommodating space 74. The second portion 72 is provided with a plurality of elastic pieces 75. The upper surface 73c of the third portion 73 is in contact with the lower end surface 50c of the fixed core 50. In this manner, the retaining protrusion 77 is engaged with the retaining recess 57 to restrict downward movement of the plurality of elastic pieces 75, and the lower end surface 50c of the fixed core 50 is in contact with the upper surface 73c of the third portion 73 to restrict upward movement of the plurality of elastic pieces 75. Therefore, the movement (rattle) of the valve body accommodating member 70 can be suppressed, and the generation of foreign matter can be more effectively suppressed.

[0052] Further, the fixed core 50 has a lower end surface 50c provided with a rotation prevention recess 58. The upper surface 73c of the third portion 73 has a rotation prevention protrusion 78 that engages with the rotation prevention recess 58 so as to restrict the rotation of the valve body accommodating member 70 around the first axis L1. In this manner, the rotation prevention protrusion 78 engages with the rotation prevention recess 58, thereby restricting the rotation of the valve body accommodating member 70 around the first axis L1, and the generation of foreign matter can be more effectively suppressed. Note that the solenoid valve 1 may have a configuration in which the rotation prevention recess 58 and the rotation prevention protrusion 78 are omitted.

[0053] 5 to 7 show a solenoid valve 1A according to a first modified example of the solenoid valve 1 described above.

[0054] FIG. 5 is an enlarged cross-sectional view of a valve body accommodating member and its vicinity of a solenoid valve according to a first modified example of the solenoid valve of FIG. 1. In FIG. 5, the magnetic coil is omitted. FIGS. 6 and 7 are diagrams showing the valve body accommodating member of the solenoid valve of FIG. 5. FIG. 6(a) is a front view of the valve body accommodating member. FIG. 6(b) is a plan view of the valve body accommodating member. FIG. 7(a) is a cross-sectional view taken along line VIIA-VIIA in FIG. 6(b). FIG. 7(b) is an enlarged view of a portion surrounded by a two-dot chain rectangle in FIG. 7(a). In the following description of the modified examples, components that are the same (including substantially the same) as those in the solenoid valve 1 according to the first embodiment are given the same reference numerals and description thereof is omitted.

[0055] The solenoid valve 1A includes a valve body 10, a valve element 20, a plunger 30, a valve shaft 40, a fixed core 50A (also called an "attractor"), an electromagnetic coil 60, and a valve element accommodating member 70A.

[0056] The fixed core 50A has the same configuration as the fixed core 50 of the first embodiment, except that the anti-rotation recess 58 is omitted.

[0057] The valve body accommodating member 70A has the same configuration as the valve body accommodating member 70 of the first embodiment, except that (1) instead of the retaining protrusions 77, the retaining protrusions 77A are provided at the tips 75a of the elastic pieces 75 and protrude outward, and (2) the rotation prevention protrusions 78 are omitted. The retaining protrusions 77A protrude outward. The retaining protrusions 77A are formed so that the cross-sectional shape along the first axis L1 is a wedge shape with the tip facing upward. The elastic pieces 75 of the valve body accommodating member 70A elastically deform inward when inserted into the fixed iron core 50A, and the shape is restored when the retaining protrusions 77A enter the retaining recesses 57. As a result, the retaining protrusions 77A engage with the retaining recesses 57, and the valve body accommodating member 70A is fixed to the fixed iron core 50A. Therefore, it is not necessary for the elastic piece 75 to maintain its elastic deformation after the valve body accommodating member 70A is fixed to the fixed core 50A. However, from the viewpoint of preventing rattling, the elastic piece 75 may maintain its elastic deformation even after the valve body accommodating member 70A is fixed to the fixed core 50A, so that the elastic piece 75 continues to press the inner circumferential surface 50b of the fixed core 50A outward.

[0058] 8 to 10 show a solenoid valve 1B according to a second modified example of the solenoid valve 1 described above.

[0059] Fig. 8 is an enlarged cross-sectional view of a valve body accommodating member and its vicinity of a solenoid valve according to a second modified example of the solenoid valve of Fig. 1. In Fig. 8, the magnetic coil is omitted. Figs. 9 and 10 are diagrams showing the valve body accommodating member of the solenoid valve of Fig. 8. Fig. 9(a) is a front view of the valve body accommodating member. Fig. 9(b) is a plan view of the valve body accommodating member. Fig. 10(a) is a cross-sectional view taken along line XA-XA in Fig. 9(b). Fig. 10(b) is an enlarged view of a portion surrounded by a two-dot chain rectangle in Fig. 10(a).

[0060] The solenoid valve 1B includes a valve body 10, a valve element 20, a plunger 30, a valve shaft 40, a fixed core 50B (also called an "attractor"), an electromagnetic coil 60, and a valve element accommodating member 70B.

[0061] The fixed core 50B has the same configuration as the fixed core 50 of the first embodiment, except that the retaining recess 57 and the anti-rotation recess 58 are omitted.

[0062] The valve body accommodating member 70B has the same configuration as the valve body accommodating member 70 of the first embodiment, except that the retaining protrusion 77 and the anti-rotation protrusion 78 are omitted.

[0063] The above-described solenoid valves 1A and 1B also provide the same functions and effects as the solenoid valve 1 according to the first embodiment.

[0064] In the solenoid valve 1B, the retaining recess 57 and the retaining protrusion 77 are omitted, and the multiple elastic pieces 75 are inserted inside the fixed core 50B so that the multiple elastic pieces 75 are elastically deformed inward. In this manner, the multiple elastic pieces 75 are pressed against the fixed core 50B by the restoring force, and the valve body accommodating member 70B can be fixed to the fixed core 50B with a simple structure.

[0065] (Second Example) Second Embodiment A solenoid valve according to a second embodiment of the electrically driven valve of the present invention will now be described with reference to FIGS.

[0066] FIG. 11 is an enlarged cross-sectional view of a valve body accommodating member and its vicinity of a solenoid valve according to a second embodiment of the present invention. In FIG. 11, the magnetic coil is omitted. FIGS. 12 and 13 are views showing the valve body accommodating member of the solenoid valve of FIG. 11. FIG. 12(a) is a front view of the valve body accommodating member. FIG. 12(b) is a plan view of the valve body accommodating member. FIG. 13(a) is a cross-sectional view taken along line XIIIA-XIIIA in FIG. 12(b). FIG. 13(b) is an enlarged view of a portion surrounded by a two-dot chain rectangle in FIG. 13(a). In the following description, components that are the same (including substantially the same) as those in the solenoid valve 1 according to the first embodiment are given the same reference numerals and description thereof is omitted.

[0067] The solenoid valve 2 of this embodiment includes a valve body 10 , a valve element 20 , a plunger 30 , a valve shaft 40 , a fixed core 150 , an electromagnetic coil 60 , and a valve element accommodating member 170 .

[0068] The fixed core 150 has a cylindrical shape. The fixed core 150 is disposed under the small diameter portion 11a of the valve body member 11. The fixed core 150 is disposed between the valve body 20 and the plunger 30. The plunger spring 35 is disposed between the fixed core 150 and the plunger 30. The valve shaft 40 is inserted inside the fixed core 150 so as to be movable in the vertical direction (the direction of the first axis L1).

[0069] A groove-shaped fixing recess 156 extending over the entire circumferential direction is provided on an outer peripheral surface 150a of the fixed core 150. The fixing recess 156 engages with the fixing protrusion 16, whereby the fixed core 150 is fixed to the small diameter portion 11a.

[0070] A groove-shaped retaining recess 157 extending over the entire circumferential direction is provided on the outer circumferential surface 150a of the fixed core 150. The retaining recess 157 may be a plurality of holes arranged at intervals in the circumferential direction.

[0071] The valve body accommodating member 170 has a cylindrical shape. The valve body accommodating member 170 is disposed at a distance from the cylindrical portion 12a in the up-down direction. The valve body accommodating member 170 is made of a metal such as stainless steel.

[0072] The inner diameter of the lower end 171 of the valve body accommodating member 170 is slightly larger than the outer diameter of the valve body 20. An accommodating space 174 is provided inside the lower end 171. The valve body 20 is disposed in the accommodating space 174 in the open valve state. The lower end 171 is one end of the valve body accommodating member 170.

[0073] The upper end 172 of the valve body accommodating member 170 is provided with a plurality of elastic pieces 175 divided in the circumferential direction by a plurality of slits 176 extending downward from the upper end. That is, the plurality of elastic pieces 175 are formed by dividing the upper end 172 in the circumferential direction by the plurality of slits 176. In this embodiment, three elastic pieces 175 are provided. Three slits 176 are provided at intervals of 120 degrees in the circumferential direction. The plurality of elastic pieces 175 are arranged so as to be lined up in the circumferential direction of the valve body accommodating member 170. The upper end 172 is the other end of the valve body accommodating member 170.

[0074] Each of the elastic pieces 175 has a tip 175a disposed inside (inward in the radial direction) of the base end 175b before elastic deformation (i.e., in a state where no external force is applied). The elastic pieces 175 are inclined at an angle β (β is preferably about 1 to 5 degrees) with respect to the vertical direction. In FIG. 13(b), a line M2 is a straight line parallel to the first axis L1. The inner diameter of the valve body accommodating member 170 at the location where the base end 175b of the elastic pieces 175 is located is the same as the diameter of the outer peripheral surface 150a of the fixed core 150 (specifically, the diameter of the location where the elastic pieces 175 are inserted on the outer peripheral surface 150a of the fixed core 150), but strictly speaking, it is preferable that the inner diameter is slightly larger than the diameter of the outer peripheral surface 150a. In this embodiment, the elastic pieces 175 are configured to be elastically deformed outward when the fixed core 150 is inserted inside, so that the angle β becomes 0. As a result, the inner surfaces 175 d of the multiple elastic pieces 175 are pressed against the outer circumferential surface 150 a of the fixed core 150 .

[0075] The inner surface 175d of the elastic pieces 175 is provided with a retaining protrusion 177. The retaining protrusion 177 has a generally hemispherical shape. The retaining protrusion 177 is disposed on the inner surface 175d of each of the elastic pieces 175 at a position in the center in the width direction (circumferential direction) and near the tip 175a. When the fixed core 150 is inserted inside the elastic pieces 175, the retaining protrusion 177 enters the retaining recess 157 of the fixed core 150 and engages with the retaining recess 157. The retaining protrusion 177 engages with the retaining recess 157, thereby restricting the downward movement of the elastic pieces 175 (the direction in which the fixed core 150 comes out from inside the elastic pieces 175). Further, the tips 175a of the multiple elastic pieces 175 are in contact with a step portion 150e, which is an annular flat surface facing downward and provided on the outer circumferential surface 150a of the fixed core 150.

[0076] The fixed core 150 is inserted inside the multiple elastic pieces 175 of the valve body accommodating member 170. The multiple elastic pieces 175 are elastically deformed outward, and the inner surfaces 175d of the multiple elastic pieces 175 are pressed against the outer peripheral surface 150a of the fixed core 150. This fixes the valve body accommodating member 170 to the fixed core 150. In addition, the retaining protrusions 177 of the multiple elastic pieces 175 engage with the retaining recesses 157 of the fixed core 150, and the tips 175a of the multiple elastic pieces 175 contact a step portion 150e, which is a downward-facing annular flat surface provided on the outer peripheral surface 150a of the fixed core 150. This restricts the vertical movement of the multiple elastic pieces 175.

[0077] As described above, the solenoid valve 2 includes the valve body 10 having the valve seat 13, the valve element 20 that moves toward and away from the valve seat 13, the plunger 30 housed in the valve body 10, the valve shaft 40 that connects the valve element 20 and the plunger 30, the fixed core 150 that is disposed between the valve element 20 and the plunger 30 and has a cylindrical shape with the valve shaft 40 inserted inside, the electromagnetic coil 60 that is disposed outside the valve body 10, and the valve element accommodating member 170 that has a cylindrical shape. The lower end 171 of the valve element accommodating member 170 is provided with an accommodating space 174 that accommodates the valve element 20 in the open state. The upper end 172 of the valve element accommodating member 170 is provided with a plurality of elastic pieces 175 that are divided in the circumferential direction by a plurality of slits 176. The fixed core 150 is inserted inside the plurality of elastic pieces 175 so that the plurality of elastic pieces 175 are elastically deformed outward. The valve body accommodating member 170 is fixed to the fixed core 150 by a plurality of elastic pieces 175 .

[0078] By doing so, the multiple elastic pieces 175 are pressed against the fixed iron core 150 by the restoring force, and the valve body accommodating member 170 can be fixed to the fixed iron core 150 with a simple configuration. Therefore, the solenoid valve 2 can suppress the action of the fluid on the valve body 20 in the open state at low cost and can suppress the generation of foreign matter.

[0079] Moreover, the multiple elastic pieces 175 are inclined with respect to the axial direction (first axis L1 direction) of the valve body accommodating member 170 so that the tip 175a is disposed inside the base end 175b before elastic deformation. In this way, the diameter of the outer peripheral surface 150a of the fixed core 150 is made the same as the inner diameter of the portion of the valve body accommodating member 170 where the base end 175b of the multiple elastic pieces 175 is located (strictly speaking, it is preferable that the inner diameter is slightly larger than the diameter of the outer peripheral surface 150a), and the fixed core 150 is inserted inside the multiple elastic pieces 175, so that the multiple elastic pieces 175 can be elastically deformed outward. Therefore, it is not necessary to provide a tapered surface or a convex portion for elastically deforming the multiple elastic pieces 175 on the outer peripheral surface 150a of the fixed core 150, and the fixed core 150 can be made into a relatively simple shape.

[0080] Further, the outer peripheral surface 150a of the fixed core 150 is provided with a retaining recess 157. Further, the inner surface 175d of the elastic pieces 175 is provided with a retaining protrusion 177 that engages with the retaining recess 157 so as to restrict the downward movement of the elastic pieces 175 (the direction in which the fixed core 150 comes out from the inside of the elastic pieces 175). In this manner, the retaining protrusion 177 engages with the retaining recess 157, thereby preventing the valve body accommodating member 170 from falling off the fixed core 150. Note that the solenoid valve 2 may have a configuration in which the retaining recess 157 and the retaining protrusion 177 are omitted.

[0081] FIG. 14 shows a solenoid valve 2A according to a first modified example of the solenoid valve 2 described above.

[0082] Figure 14 is an enlarged cross-sectional view of a valve body housing member and its vicinity of a solenoid valve according to a first modified example of the solenoid valve of Figure 11. The magnetic coil is not shown in Figure 14. In the following description of the modified example, components that are the same as (including substantially the same as) those in the solenoid valve 2 according to the second embodiment are given the same reference numerals and description thereof will be omitted.

[0083] The solenoid valve 2A includes a valve body 10, a valve element 20, a plunger 30, a valve shaft 40, a fixed core 150 (also called an "attractor"), an electromagnetic coil 60, and a valve element housing member 170A.

[0084] The valve body accommodating member 170A has the same configuration as the valve body accommodating member 170 of the second embodiment, except that it has a retaining protrusion 177A provided at the tip 175a of the multiple elastic pieces 175 instead of the retaining protrusion 177. The retaining protrusion 177A protrudes inward. The retaining protrusion 177A is formed so that the cross-sectional shape along the first axis L1 is a wedge shape with the tip facing upward.

[0085] FIG. 15 shows a solenoid valve 2B according to a second modified example of the solenoid valve 2 described above.

[0086] Fig. 15 is an enlarged cross-sectional view of a valve body accommodating member and its vicinity of a solenoid valve according to a second modified example of the solenoid valve of Fig. 11. In Fig. 15, the magnetic coil is omitted.

[0087] The solenoid valve 2B has a valve body 10, a valve element 20, a plunger 30, a valve shaft 40, a fixed core 150B (also called an "attractor"), an electromagnetic coil 60, and the above-mentioned valve element accommodating member 170A.

[0088] The fixed core 150B has the same configuration as the fixed core 150 of the second embodiment, except that (1) the fixing recess 156 is omitted, and (2) a retaining recess 157 that also serves as the fixing recess 156 is provided.

[0089] The retaining protrusions 177A of the valve body accommodating member 170A engage with the retaining recesses 157 of the fixed core 150B. Three fixing protrusions 16 are provided at 120 degree intervals in the circumferential direction on the small diameter portion 11a of the valve body member 11, and each fixing protrusion 16 contacts the tip 175a of the multiple elastic pieces 175 and engages with the retaining recesses 157. The fixing protrusions 16 contact the tip 175a of the multiple elastic pieces 175, pushing the elastic pieces 175 inward. This allows the fixed core 150B to be fixed to the small diameter portion 11a of the valve body member 11, and more effectively prevents the valve body accommodating member 170A from falling off the fixed core 150B.

[0090] FIG. 16 shows a solenoid valve 2C according to a third modified example of the solenoid valve 2 described above.

[0091] Fig. 16 is an enlarged cross-sectional view of a valve body accommodating member and its vicinity of a solenoid valve according to a third modified example of the solenoid valve of Fig. 11. In Fig. 16, the magnetic coil is omitted.

[0092] The solenoid valve 2C includes a valve body 10, a valve element 20, a plunger 30, a valve shaft 40, a fixed core 150C, an electromagnetic coil 60, and a valve element accommodating member 170C.

[0093] The fixed core 150C has the same configuration as the fixed core 150 of the second embodiment, except that the retaining recess 157 is omitted.

[0094] The valve body accommodating member 170C has the same configuration as the valve body accommodating member 170 of the second embodiment, except that the retaining protrusion 177 is omitted.

[0095] The above-described solenoid valves 2A, 2B, and 2C also have the same functions and effects as the solenoid valve 2 according to the second embodiment.

[0096] In the solenoid valve 2C, the retaining recess 157 and the retaining protrusion 177 are omitted, and the fixed core 150C is inserted inside the multiple elastic pieces 175 so that the multiple elastic pieces 175 elastically deform outward. In this manner, the multiple elastic pieces 175 are pressed against the fixed core 150C by the restoring force, and the valve body accommodating member 170C can be fixed to the fixed core 150C with a simple configuration.

[0097] Although the embodiments of the present invention have been described above, the present invention is not limited to these examples. Any addition, deletion, or design change of components by a person skilled in the art to the above-mentioned embodiments, or any combination of features of the embodiments as appropriate, is also included in the scope of the present invention as long as it does not go against the spirit of the present invention. [Explanation of symbols]

[0098] (First embodiment) 1, 1A, 1B... solenoid valve, 10... valve body, 11... valve body member, 11a... small diameter portion, 11b... large diameter portion, 12... valve seat member, 13... valve seat, 14... valve chamber, 15... valve port, 16... fixed convex portion, 20... valve body, 30... plunger, 40... valve stem, 50, 50A, 50B... fixed core, 50a... outer circumferential surface, 50b... inner circumferential surface, 50c... lower end surface, 56... fixed recess, 57... retaining recess, 58... rotation Retaining recess, 60... electromagnetic coil, 70, 70A, 70B... valve body accommodating member, 71... first portion, 72... second portion, 73... third portion, 73c... upper surface, 74... accommodating space, 75... elastic piece, 75a... tip, 75b... base end, 75c... outer surface, 76... slit, 77, 77A... retaining protrusion, 78... anti-rotation protrusion, 91... first conduit, 92... second conduit, L1... first axis, L2... second axis (Second Example) 2, 2A, 2B, 2C... solenoid valve, 150, 150B, 150C... fixed core, 150a... outer circumferential surface, 150e... step portion, 156... fixed recess, 157... retaining recess, 170, 170A, 170C... valve body accommodating member, 171... lower end portion, 172... upper end portion, 174... accommodation space, 175... elastic piece, 175a... tip end, 175b... base end, 175d... inner surface, 176... slit, 177, 177A... retaining protrusion

Claims

1. An electrically driven valve comprising: a valve body having a valve seat, a valve element adapted to move toward and away from the valve seat, a plunger housed in the valve body, a valve stem connecting the valve element and the plunger, a cylindrical fixed iron core disposed between the valve element and the plunger and having the valve stem inserted therein, an electromagnetic coil disposed outside the valve body, and a cylindrical valve element housing member, An accommodation space for accommodating the valve body in an open state is provided at one end of the valve body accommodation member, The other end of the valve body accommodating member is provided with a plurality of elastic pieces, The elastic pieces are inserted inside the fixed core, or the fixed core is inserted inside the elastic pieces, the valve body accommodating member is fixed to the stationary iron core by the plurality of elastic pieces, the plurality of elastic pieces are formed by dividing the other end of the valve body accommodating member in the circumferential direction by a plurality of slits.

2. An electrically driven valve comprising: a valve body having a valve seat, a valve element adapted to move toward and away from the valve seat, a plunger accommodated in the valve body, a valve stem connecting the valve element and the plunger, a cylindrical fixed iron core arranged between the valve element and the plunger and having the valve stem inserted therein, an electromagnetic coil arranged outside the valve body, and a cylindrical valve element accommodating member, An accommodation space for accommodating the valve body in an open state is provided at one end of the valve body accommodation member, The other end of the valve body accommodating member is provided with a plurality of elastic pieces, The elastic pieces are inserted inside the fixed core, or the fixed core is inserted inside the elastic pieces, the valve body accommodating member is fixed to the stationary iron core by the plurality of elastic pieces, The elastic pieces are inserted inside the fixed core so that the elastic pieces are elastically deformed inward, the plurality of elastic pieces are inclined with respect to an axial direction of the valve body accommodating member so that, before being elastically deformed, their tips are positioned outwardly of their base ends.

3. An electrically driven valve comprising: a valve body having a valve seat, a valve element adapted to move towards and away from the valve seat, a plunger housed in the valve body, a valve stem connecting the valve element and the plunger, a cylindrical fixed iron core disposed between the valve element and the plunger and having the valve stem inserted therein, an electromagnetic coil disposed outside the valve body, and a cylindrical valve element housing member, An accommodation space for accommodating the valve body in an open state is provided at one end of the valve body accommodation member, The other end of the valve body accommodating member is provided with a plurality of elastic pieces, The elastic pieces are inserted inside the fixed core, or the fixed core is inserted inside the elastic pieces, the valve body accommodating member is fixed to the stationary iron core by the plurality of elastic pieces, The elastic pieces are inserted inside the fixed core so that the elastic pieces are elastically deformed inward, The fixed core has an inner peripheral surface provided with a retaining recess, An electrically driven valve, wherein the outer surfaces of the plurality of elastic pieces are provided with anti-slip protrusions that engage with the anti-slip recesses so as to restrict movement of the plurality of elastic pieces in a direction away from the inside of the fixed iron core.

4. An electrically driven valve comprising: a valve body having a valve seat, a valve element adapted to move towards and away from the valve seat, a plunger housed in the valve body, a valve stem connecting the valve element and the plunger, a cylindrical fixed iron core arranged between the valve element and the plunger and having the valve stem inserted therein, an electromagnetic coil arranged outside the valve body, and a cylindrical valve element accommodating member, An accommodation space for accommodating the valve body in an open state is provided at one end of the valve body accommodation member, The other end of the valve body accommodating member is provided with a plurality of elastic pieces, The elastic pieces are inserted inside the fixed core, or the fixed core is inserted inside the elastic pieces, the valve body accommodating member is fixed to the stationary iron core by the plurality of elastic pieces, The elastic pieces are inserted inside the fixed core so that the elastic pieces are elastically deformed inward, the valve body accommodating member has a first portion having a cylindrical shape, a second portion having a cylindrical shape with an outer diameter smaller than that of the first portion, and a third portion having an annular flat plate shape connecting the first portion and the second portion, The first portion is the one end portion where the accommodation space is provided, the second portion is the other end portion on which the plurality of elastic pieces are provided, an electrically driven valve, wherein a surface of the third portion facing the second portion is in contact with an end surface of the fixed core facing the valve seat.

5. A rotation prevention recess is provided on an end surface of the fixed iron core on the valve seat side, 5. The electrically driven valve according to claim 4, wherein a surface of the third portion facing the second portion is provided with an anti-rotation protrusion that engages with the anti-rotation recess so as to restrict rotation of the valve body accommodating member about the axis.

6. An electrically driven valve comprising: a valve body having a valve seat, a valve element adapted to move toward and away from the valve seat, a plunger accommodated in the valve body, a valve stem connecting the valve element and the plunger, a cylindrical fixed iron core arranged between the valve element and the plunger and having the valve stem inserted therein, an electromagnetic coil arranged outside the valve body, and a cylindrical valve element accommodating member, An accommodation space for accommodating the valve body in an open state is provided at one end of the valve body accommodation member, The other end of the valve body accommodating member is provided with a plurality of elastic pieces, The elastic pieces are inserted inside the fixed core, or the fixed core is inserted inside the elastic pieces, the valve body accommodating member is fixed to the stationary iron core by the plurality of elastic pieces, The fixed core is inserted inside the elastic pieces so that the elastic pieces are elastically deformed outward, the plurality of elastic pieces are inclined with respect to an axial direction of the valve body accommodating member such that, before the elastic deformation, the distal ends of the elastic pieces are positioned more inward than the proximal ends of the elastic pieces.

7. An electrically driven valve comprising: a valve body having a valve seat, a valve element adapted to move towards and away from the valve seat, a plunger housed in the valve body, a valve stem connecting the valve element and the plunger, a cylindrical fixed iron core disposed between the valve element and the plunger and having the valve stem inserted therein, an electromagnetic coil disposed outside the valve body, and a cylindrical valve element housing member, An accommodation space for accommodating the valve body in an open state is provided at one end of the valve body accommodation member, The other end of the valve body accommodating member is provided with a plurality of elastic pieces, The elastic pieces are inserted inside the fixed core, or the fixed core is inserted inside the elastic pieces, the valve body accommodating member is fixed to the stationary iron core by the plurality of elastic pieces, The fixed core is inserted inside the elastic pieces so that the elastic pieces are elastically deformed outward, The fixed core is provided on its outer circumferential surface with a recess for preventing it from coming off. An electrically driven valve, wherein an anti-slip protrusion is provided on an inner surface of the plurality of elastic pieces so as to engage with the anti-slip recess so as to restrict movement of the fixed core in the plurality of elastic pieces in a direction in which the fixed core comes out from inside the plurality of elastic pieces.

8. 8. The electrically driven valve according to claim 7, wherein the valve body is provided with a fixing protrusion that contacts a tip of at least one of the plurality of elastic pieces and engages with the retaining recess.

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