JP4365778B2 - solenoid valve - Google Patents

Description

  The present invention relates to a solenoid valve, and more particularly to a solenoid valve suitable for being configured as a control valve for a variable capacity compressor that controls a discharge capacity of a variable capacity compressor that constitutes a refrigeration cycle.

  The compressor used for compressing the refrigerant in the refrigeration cycle of the air conditioner for automobiles uses the engine as a drive source, and therefore cannot control the rotational speed. Therefore, in order to obtain an appropriate cooling capacity without being restricted by the engine speed, a variable capacity compressor capable of changing the compression capacity of the refrigerant is used.

  In such a variable capacity compressor, a compression piston is connected to a swing plate attached to a shaft that is rotationally driven by an engine, and the stroke of the compression piston is changed by changing the angle of the swing plate. The amount of refrigerant discharged is changed.

  The angle of the swing plate is continuously increased by introducing a part of the compressed refrigerant into the sealed crank chamber, changing the pressure of the introduced refrigerant, and changing the balance of pressure applied to both sides of the compression piston. Is changing.

  The pressure in the crank chamber is adjusted by, for example, providing a control valve including an electromagnetic valve between the discharge chamber and the crank chamber of the variable capacity compressor and changing the flow rate of the refrigerant introduced from the discharge chamber into the crank chamber. At this time, an orifice is provided between the crank chamber and the suction chamber, and a path through which the refrigerant flows from the discharge chamber to the suction chamber is formed. The control valve includes, for example, a valve body capable of opening and closing a valve hole that is in contact with and separated from a valve hole that forms a refrigerant passage that communicates the discharge chamber and the crank chamber. And the flow rate of the refrigerant | coolant which flows from the discharge chamber side to the suction chamber side is adjusted by controlling the lift amount from the valve hole of this valve body (for example, refer patent document 1).

The control valve includes a valve component having the valve body therein and a solenoid that drives the valve body.
A plurality of refrigerant passages including a refrigerant passage communicating with the valve hole and a guide hole for guiding a piston rod that supports the valve body in the axial direction are formed in the body of the valve component.

  On the other hand, the solenoid is inserted into the second body and the second body that also serve as a part of the body of the valve component, the core fixed to the body of the valve component, and the piston rod on the same axis. The shaft is supported by the shaft, the plunger that transmits the driving force to the valve body through the shaft, the electromagnetic coil disposed around the core and the plunger through the sleeve made of a non-magnetic material, and the electromagnetic coil is disposed to cover the electromagnetic coil. Provided with a yoke. The yoke is formed into a bottomed cylindrical shape by cutting a metal made of a magnetic material to form a solenoid case, and an open end thereof is joined to the second body.

A spring that urges the valve body in the valve opening direction is arranged between the valve body and the valve body is open when the solenoid is turned off. When the plunger is sucked into the core, a driving force in the valve closing direction is applied to the valve body through the shaft.
JP 2004-232533 A (FIG. 1 etc.)

  By the way, in such a control valve for a variable capacity compressor, as described above, a second body is provided separately from the body of the valve component in order to fix the solenoid to the valve component. Moreover, the second body constitutes a magnetic circuit together with the core, plunger, and case, but in order to ensure the characteristics of the solenoid, it is necessary to make the cross sections of the magnetic passages as equal as possible. The shape must be such that the cross section is large. For this reason, there exists a problem that a structure becomes complicated and component cost increases. In addition, since the case is manufactured by cutting, there is a problem that the manufacturing time is increased because the processing time is long and the yield of the material is deteriorated.

Such a problem is not limited to the control valve for the variable displacement compressor described above, and may be commonly found in an electromagnetic valve that opens and closes the valve portion of the valve component with a solenoid.
The present invention has been made in view of these points, and an object thereof is to provide a solenoid valve that can simplify the configuration of the solenoid and can be easily attached to the solenoid.

  In the present invention, in order to solve the above problem, in an electromagnetic valve that regulates the flow rate of the refrigerant introduced from the upstream side and derives it to the downstream side, the body in which the passage of the refrigerant is formed, and the upstream side In order to adjust the flow rate of the refrigerant flowing to the downstream side, the valve body that contacts and separates the valve seat formed in the body, the shaft that supports the valve body in the axial direction, and the screw portion A core that is fixed to the body and coaxially inserts the shaft; a plunger that is disposed on the opposite side of the threaded portion of the core and that transmits a driving force to the valve body via the shaft; and the core and A sleeve made of a non-magnetic material extrapolated to the plunger, an electromagnetic coil extrapolated to the sleeve and generating a magnetic circuit by energization, and a case disposed around the electromagnetic coil and functioning as a yoke A solenoid comprising a magnetic reinforcing plate provided between the core in the case and constituting a part of the magnetic circuit, wherein the case is disposed between the body and the magnetic reinforcing plate The magnetic reinforcing plate has a plate-like main body fixed to the core, and a fitting portion provided on the main body and capable of fitting with a predetermined tool. By rotating the magnetic reinforcing plate with the tool, the core is screwed into the body and fixed, and the case is partially sandwiched between the body and the magnetic reinforcing plate. An electromagnetic valve is provided that is configured to be fixed to the body.

  Before assembling the electromagnetic coil, such a solenoid valve is assembled by rotating the magnetic reinforcing plate fixed to the core with the case portion disposed between the body and the magnetic reinforcing plate. Screw into the body. For this reason, the core is fixed to the body at the same time as the case is partially sandwiched between the body and the magnetic reinforcing plate.

In addition, when the case and the magnetic reinforcing plate are assembled, a magnetic path connected to the core is formed by both of them, so that it is not necessary to separately provide a complicated body (second body).
Further, according to the present invention, in the solenoid valve that regulates the flow rate of the refrigerant introduced from the upstream side and leads to the downstream side, the body in which the passage of the refrigerant is formed, and the upstream side to the downstream side In order to adjust the flow rate of the refrigerant flowing to the valve body, it is fixed to the body via a valve body that contacts and separates from a valve seat formed in the body, a shaft that supports the valve body in the axial direction, and a screw portion. A core that coaxially inserts the shaft, a plunger that is disposed on the opposite side of the threaded portion of the core, and that transmits a driving force to the valve body via the shaft, and the core and the plunger. A sleeve made of a non-magnetic material to be extrapolated, an electromagnetic coil that is extrapolated to the sleeve and generates a magnetic circuit including the plunger and the core by energization, and a yoke disposed around the electromagnetic coil. A solenoid composed of a functioning case, and the case is connected to the core via a rotation prevention structure at a joint portion with the body, and the case is rotated, whereby the core is attached to the body. An electromagnetic valve is provided that is screwed and configured so that the case is fixed to the body.

  In assembling such an electromagnetic valve, when assembling the electromagnetic coil, the core is screwed into the body by rotating the case. For this reason, the case is fixed to the body at the same time as the core is fixed to the body.

  In addition, since the magnetic path connected to the core is formed by the case, it is not necessary to provide a separate complicated body (second body).

  According to the electromagnetic valve of the present invention, in the assembly process, the core and the case can be assembled to the body by a simple operation of turning the magnetic reinforcing plate fixed to the core. In addition, since the magnetic path is formed by the case and the magnetic reinforcing plate, it is not necessary to provide a complicatedly shaped body and can be realized simply and at low cost.

  Moreover, if it is set as the structure which connects a core and a case via a rotation prevention structure, a core and a case can be assembled | attached to a body by the simple operation | work of turning a case. In this case, since the magnetic reinforcing plate can be omitted, the number of parts can be reduced. Further, since the case can be grasped from the outside, the assembling work is very easy.

Hereinafter, embodiments of the present invention will be described in detail with reference to the drawings. In the following description, for the sake of convenience, the positional relationship between the structures may be expressed as upper and lower with reference to the illustrated state.
[First Embodiment]
FIG. 1 is a cross-sectional view illustrating a configuration of a variable displacement compressor control valve according to a first embodiment.

  The variable displacement compressor control valve 1 includes a valve component 2 that opens and closes a refrigerant flow path for allowing a part of refrigerant discharged from a variable displacement compressor (not shown) to flow into the crank chamber, and a valve of the valve component 2. And a solenoid 3 for controlling the flow rate of the refrigerant passing therethrough by adjusting the valve opening amount of the unit.

  The valve component 2 is provided with a port 11 at the top of the body 10 for receiving the discharge pressure Pd in communication with the discharge chamber of the variable capacity compressor. A strainer 12 is fitted to the upper end portion of the body 10 so as to cover the port 11. The port 11 communicates internally with a port 13 provided on the side of the body 10. The port 13 communicates with a crank chamber of the variable capacity compressor and derives a controlled pressure (referred to as “crank pressure”) Pc in the crank chamber.

  A cylindrical valve seat forming member 14 is fitted in the refrigerant passage communicating the port 11 and the port 13, and a valve hole 15 is formed by the internal passage, and the valve seat is formed by the inner peripheral edge of the end on the crank chamber side. 16 is formed.

  A valve body 17 is disposed so as to be able to contact and separate from the valve seat 16 from the side from which the discharge pressure Pd is derived. The valve body 17 has a long cylindrical main body having a guide portion 18 at the center, and the guide portion 18 is slidably inserted into a guide hole 19 provided in the body 10. One end of the valve body 17 is disposed in a pressure chamber communicating with the crank chamber on the downstream side of the valve hole 15, and opens and closes the valve hole 15 by contacting and separating. A flange-like other end portion (flange portion) 20 is formed below the guide portion 18 of the valve body 17 with a small diameter portion therebetween, and the axis line is formed by a long shaft 21 arranged on the same axis line. Supported in the direction. The valve body 17 has a cross-sectional area excluding a small-diameter portion substantially equal to the cross-sectional area of the valve hole 15, and one end portion of the valve body 17 is partially inserted into the valve hole 15 when the valve hole 15 is closed. It is a spool valve body.

  Further, a port 23 is formed slightly below the center of the body 10 so as to communicate with the suction chamber of the variable capacity compressor and receive the suction pressure Ps. The port 24 has a predetermined depth provided at the center of the lower end of the body 10. Communicating with The opening hole 24 forms a pressure chamber into which the suction pressure Ps is introduced, and a contact portion between the valve body 17 and the shaft 21 is disposed. Further, between the vicinity of the lower end opening of the guide hole 19 of the body 10 and the flange portion 20 of the valve body 17, a conical spring 22 whose diameter is increased upward is interposed, and the valve body 17 is opened in the valve opening direction. Is energized.

  On the other hand, the solenoid 3 includes a core 32 disposed in the case 31, a plunger 33 that transmits a driving force to the valve body 17 via the shaft 21 in order to control opening and closing of the valve portion of the valve component 2, An electromagnetic coil 35 disposed around the core 32 and the plunger 33 via a bottomed sleeve 34 made of a magnetic material, and a magnetic reinforcing plate 36 provided at the upper end in the case 31 are provided.

  The case 31 has a bottomed cylindrical main body formed by pressing, and an insertion hole through which the upper end of the core 32 can be inserted is formed at the center of the bottom (in the figure, the center of the upper bottom). The case 31 is made of a magnetic material that also serves as the yoke of the solenoid 3, and is arranged so that the upper wall portion is sandwiched between the body 10 and the magnetic reinforcing plate 36. A plate 37 made of a magnetic material externally attached to the bottomed sleeve 34 is disposed at the lower end of the electromagnetic coil 35, and is fixed by crimping the opening edge of the case 31. In the solenoid 3, a magnetic circuit is configured by the core 32, the plunger 33, the plate 37, the case 31, and the magnetic reinforcing plate 36.

  The core 32 is provided with a threaded portion 32 a at the upper end thereof, and the threaded portion 32 a is fixed to the body 10 by being screwed into a threaded portion 24 a provided in the opening hole 24 of the body 10. . The core 32 is provided with an insertion hole that passes through the center in the axial direction and passes through the upper half of the shaft 21. The upper end opening of the core 32 slidably supports the upper end of the shaft 21. A cylindrical guide member 38 is inserted. A refrigerant passage 38 a penetrating in the axial direction is formed in the peripheral portion of the guide member 38.

  The bottom half of the bottomed sleeve 34 whose bottom end is closed is extrapolated to the bottom half of the core 32. In the bottomed sleeve 34, the plunger 33 is integrated with the shaft 21. It is supported so that it can move forward and backward. The bottomed sleeve 34 is fitted in a groove portion whose upper end is provided around the central portion of the core 32. Further, a seal member 39 having a gourd-shaped cross section is disposed between the bottomed sleeve 34 and the core 32 to keep the inside of the bottomed sleeve 34 airtight.

  A bearing member 40 is fixedly disposed at the lower end of the bottomed sleeve 34 and supports the lower end of the shaft 21 so as to be slidable. A plunger 33 is fitted to the lower portion of the shaft 21 in the longitudinal direction. The plunger 33 has a spring receiving member 41 inserted into its upper end opening, and is urged downward by a spring 42 interposed between the core 32 and the spring receiving member 41, while It is interposed therebetween and is biased upward by a spring 43. And the spring load which the spring 42 provides to the plunger 33 can be adjusted now by changing the insertion amount to the plunger 33 of the spring receiving member 41. FIG. An electromagnetic coil 35 is disposed on the outer periphery of the bottomed sleeve 34, and a harness 44 for supplying power to the electromagnetic coil 35 is led out to the outside.

Next, the configuration around the magnetic reinforcing plate, which is the main part of the present embodiment, will be described in detail. FIG. 2 is a cross-sectional view taken along the line AA of FIG.
The magnetic reinforcing plate 36 has a gear shape in which a plurality of leg portions 52 are arranged along the outer peripheral edge of a disc-shaped main body 51 having a substantially constant thickness. The approximate circle along the outer peripheral end of the leg portion 52 is substantially equal to the circular shape formed by the inner peripheral surface of the case 31. A fitting portion 53 that can be fitted to the tip of a predetermined tool is formed by a gap formed between at least one of the plurality of leg portions 52 adjacent to each other. Each leg 52 is formed so that its width increases inwardly from the outer periphery of the magnetic reinforcing plate 36, and follows a magnetic circuit in which each leg 52 and the upper wall 31 a of the case 31 are combined. The sum of the cross-sectional areas with respect to the magnetic field is substantially equal.

  In the center of the magnetic reinforcing plate 36, a hole portion capable of press-fitting the upper end portion of the core 32 is formed. Serrated portions 55 and 56 each having a saw blade shape which is complementary to each other are provided at the joint between the magnetic reinforcing plate 36 and the core 32, and the magnetic reinforcing plate 36 and the core 32 are engaged with each other. In contrast, rotation around the axis is prevented.

Providing such a magnetic reinforcing plate 36 simplifies the assembly work of the solenoid. FIG. 3 is a cross-sectional view illustrating an outline of a method for assembling the solenoid.
In assembling the control valve 1 for the variable capacity compressor, the case 31 and the core 32 are fixed to the body 10 before the electromagnetic coil 35 is assembled in the case 31.

  That is, as shown in FIG. 5A, the bottomed sleeve 34 is sequentially assembled with the bearing member 40, the spring 43, the plunger 33 fitted with the shaft 21, the spring 42, the core 32 fitted with the guide member 38, and the like. Further, a drive unit 61 in which a magnetic reinforcing plate 36 is joined to the upper end portion of the core 32 is formed. And this drive part 61 is inserted from the lower opening end of case 31, the upper wall part 31a of case 31 is latched to the magnetic reinforcement board 36, and the thread part 32a of the core 32 is exposed above the case 31. .

  Then, as shown in FIG. 5B, after the sealing O-ring 62 is attached between the screw portion 32 a and the upper wall portion 31 a of the case 31, the screw portion 32 a is inserted into the opening hole 24 of the body 10. Insert and screw into the threaded portion 24a. The screwing of these threaded parts is a predetermined tool as shown by a two-dot chain line in the drawing, that is, a tool that can be inserted and fitted to the fitting part 53 of the magnetic reinforcing plate 36. 63 is used. The tool 63 may have, for example, a shape complementary to the fitting portion 53 of the magnetic reinforcing plate 36 and the same number of legs, or may have fewer legs than the number of the fitting portions 53. By rotating the magnetic reinforcing plate 36 using this tool 63, the screw portion 32 a of the core 32 is screwed into the screw portion 24 a of the body 10. The case 31 is fixed to the body 10 such that the upper wall portion 31 a is sandwiched between the body 10 and the magnetic reinforcing plate 36. In this case, the bottomed sleeve 34 of the drive unit 61 is not gripped and rotated, but the magnetic reinforcing plate 36 is rotated because the thickness of the bottomed sleeve 34 is thin so that the torsional strength thereof is increased. Is considered to be small, and if the bottomed sleeve 34 is deformed, the axis of the shaft 21 may be shifted.

  From this state, the electromagnetic coil 35, the plate 37, the harness 44, and the like are sequentially assembled, and the lower end opening of the case 31 is crimped inward, whereby the assembly of the solenoid 3 is almost completed.

  Returning to FIG. 1, in the variable displacement compressor control valve 1 having the above configuration, since the pressure receiving area of the valve body 17 and the cross-sectional area of the valve hole 15 are equal, the crank pressure Pc is substantially in the axial direction of the valve body 17. Does not work. For this reason, the valve body 17 senses the differential pressure between the discharge pressure Pd and the suction pressure Ps purely, and operates in the valve opening / closing direction.

  Further, the spring load by the conical spring 22 and the spring 42 that applies the biasing force in the valve opening direction to the valve body 17 is set larger than the spring load of the spring 43 that applies the biasing force in the valve closing direction. For this reason, when the solenoid 3 is not energized, the valve body 17 is separated from the valve seat 16 and the valve portion is held in a fully opened state. At this time, the high-pressure refrigerant having the discharge pressure Pd introduced from the discharge chamber of the variable capacity compressor to the port 11 passes through the valve portion in the fully open state and flows from the port 13 to the crank chamber. Therefore, the variable capacity compressor is operated with the minimum discharge capacity because the crank chamber pressure Pc is close to the discharge pressure Pd.

  On the other hand, the current value supplied to the solenoid 3 becomes maximum when the automobile air conditioner is started or when the cooling load is maximum. At this time, since the plunger 33 is attracted to the core 32 with the maximum suction force, the valve body 17 is supported by the shaft 21 fixed to the plunger 33 against the urging force of the conical spring 22 and the spring 42. The valve body 17 is pushed in the valve closing direction, whereby the valve body 17 is seated on the valve seat 16 and the valve portion is fully closed. At this time, since the high-pressure refrigerant with the discharge pressure Pd introduced into the port 11 is blocked by the fully closed valve portion, the variable capacity compressor has the crank chamber pressure Pc close to the suction pressure Ps. The operation with the maximum discharge capacity is performed.

  Here, when the value of the current supplied to the solenoid 3 is set to a predetermined value, the valve element 17 has a spring load of the conical spring 22 and the spring 42 biased in the valve opening direction and in the valve closing direction. Due to the spring load of the energizing spring 43, the load of the solenoid 3 energizing in the valve closing direction, the force by the discharge pressure Pd received in the valve opening direction, and the suction pressure Ps received in the valve closing direction Stops at the valve lift position where force is balanced.

  In this balanced state, if the rotational speed of the variable capacity compressor is increased by increasing the engine speed and the discharge capacity is increased, the discharge pressure Pd is increased and the suction pressure Ps is decreased. (Pd−Ps) increases, and a force in the valve opening direction acts on the valve element 17, and the valve element 17 further increases the flow rate of the refrigerant flowing from the discharge chamber to the crank chamber. As a result, the crank chamber pressure Pc increases, and the variable displacement compressor operates in a direction to decrease its discharge capacity, and the differential pressure (Pd−Ps) is controlled to be a predetermined value set by the solenoid 3. Is done. When the engine speed decreases, the reverse operation is performed, and the variable capacity compressor is controlled so that the differential pressure (Pd−Ps) becomes a predetermined value set by the solenoid 3.

  As described above, in the variable displacement compressor control valve 1 according to the present embodiment, the magnetic circuit can be configured with a simple configuration in which the magnetic reinforcing plate 36 is assembled to the press-molded case 31. It is not necessary to separately provide a complicated body for the solenoid 3. Further, in assembling the control valve 1 for the variable capacity compressor, the core 32 and the case 31 can be assembled to the body 10 by a simple operation of turning the magnetic reinforcing plate 36 fixed to the core 32. For this reason, it can be realized at low cost.

  In the present embodiment, a gear-shaped member is shown as the magnetic reinforcing plate 36, but the fitting portion of the magnetic reinforcing plate may be composed of a plurality of holes or grooves provided in the main body. FIG. 4 is an explanatory view showing a modified example of the magnetic reinforcing plate, and corresponds to FIG.

  The magnetic reinforcing plate 136 is provided with a plurality of circular holes 153 arranged at equal intervals on a predetermined concentric circle in the intermediate portion in the radial direction of the disk-shaped main body 151. The circular hole 153 passes through the main body 151 in the thickness direction. By inserting a predetermined tool (not shown) through the circular hole 153 and turning it around the axis, the core 32 press-fitted into the magnetic reinforcing plate 136 can be screwed into the body 10.

  In addition, although the modified example of the magnetic reinforcement plate was described here, the hole portion may not be such a circular hole, but may be a groove portion that is opened only on the tool side instead of the through hole. Moreover, the number and position of a hole or a groove part are not restricted to the aspect of illustration, It is possible to change suitably according to the shape of the tool to be used. The same applies to the number and size of the magnetic reinforcing plates 36 described above.

  Further, in the present embodiment, the shape of the valve body 17 is a cylindrical shape having substantially the same cross-sectional area over the entire length. Good. Further, since the valve body 17 also has a function as a piston rod, the valve body 17 may be configured as a mode in which a coaxial piston rod is fixed to a valve body portion that contacts and separates from the valve hole 15.

[Second Embodiment]
Next, a second embodiment of the present invention will be described. The variable displacement compressor control valve according to the present embodiment is different from the first embodiment in that the core is screwed into the body using a solenoid case. In the following description, components that are substantially the same as those in the first embodiment are denoted by the same reference numerals, and the description thereof is omitted as appropriate. FIG. 5 is a cross-sectional view showing the configuration of the variable displacement compressor control valve according to the present embodiment. 6 is a cross-sectional view taken along the line BB in FIG.

  As shown in FIG. 5, in this variable displacement compressor control valve 201, the solenoid 203 is not provided with a magnetic reinforcing plate, and accordingly, the upper wall portion of the case 231 that constitutes a part of the magnetic circuit. The thickness of 231a is large. The case 231 is formed by press molding such as extrusion or forging.

  As shown in FIG. 6, a hole portion in which the upper end portion of the core 232 can be press-fitted is formed in the center of the upper wall portion 231 a of the case 231. Serration portions 255 and 256 having a saw blade shape that is complementary to each other are provided at the joint portion of the case 231 and the core 232, and the case 231 is rotated around the axis with respect to the core 232 by meshing them. It is prevented from rotating.

  As described above, in the variable displacement compressor control valve 201, the core 232 and the case 231 can be assembled to the body 10 by a simple operation of rotating the case 231. In this case, since the magnetic reinforcing plate can be omitted, the number of parts can be reduced. Further, since the case 231 can be grasped from the outside, the assembling work can be performed very easily.

  In the present embodiment, an example in which the thickness of the upper wall portion 231a of the case 231 is made constant is shown. However, in order to make the cross sections of the magnetic passages equal, the thickness increases toward the inside. May be.

  Further, a mode in which the present embodiment and the first embodiment are combined, that is, a case and a magnetic reinforcing plate are provided, both of them are fixed to the core, and the case is rotated to turn the core into the valve component. You may comprise so that it may screw into a body.

It is sectional drawing which shows the structure of the control valve for variable capacity compressors which concerns on 1st Embodiment. It is AA arrow sectional drawing of FIG. It is sectional drawing showing the outline | summary of the assembly | attachment method of a solenoid. It is explanatory drawing showing the modification of a magnetic reinforcement board. It is sectional drawing which shows the structure of the control valve for variable capacity compressors which concerns on 2nd Embodiment. It is BB arrow sectional drawing of FIG.

Explanation of symbols

1,201 Variable displacement compressor control valve 2 Valve component 3,203 Solenoid 10 Body 14 Valve seat forming member 15 Valve hole 16 Valve seat 17 Valve body 21 Shaft 22 Conical spring 24a Threaded portion 31, 231, Case 31a, 231a Upper Wall portion 32, 232 Core 33 Plunger 34 Bottomed sleeve 35 Electromagnetic coil 36, 136 Magnetic reinforcing plate 51, 151 Main body 52 Leg portion 53 Fitting portion 55, 56, 255, 256 Serration portion 63 Tool 153 Circular hole

Claims (9)

In the solenoid valve that adjusts the flow rate of the refrigerant introduced from the upstream side and leads it to the downstream side,
A body having a passage for the refrigerant formed therein;
In order to adjust the flow rate of the refrigerant flowing from the upstream side to the downstream side, a valve body that contacts and separates from a valve seat formed in the body;
A shaft that supports the valve body in the axial direction;
A core that is fixed to the body via a screw part and is coaxially inserted into the shaft, and disposed on the opposite side of the screw part of the core, and transmits a driving force to the valve body via the shaft. A plunger, a sleeve made of a non-magnetic material that is extrapolated to the core and the plunger, an electromagnetic coil that is extrapolated to the sleeve and generates a magnetic circuit by energization, and is disposed around the electromagnetic coil as a yoke A solenoid comprising a functioning case and a magnetic reinforcing plate provided between the core in the case and constituting a part of the magnetic circuit;
With
The case has a wall portion disposed between the body and the magnetic reinforcing plate,
The magnetic reinforcing plate has a plate-like main body fixed to the core, and a fitting portion that is provided on the main body and can be fitted with a predetermined tool.
When the magnetic reinforcing plate is rotated by the predetermined tool, the core is screwed and fixed to the body, and the case is partially sandwiched between the body and the magnetic reinforcing plate. An electromagnetic valve configured to be fixed to the body. By controlling the pressure in the crank chamber of the variable capacity compressor, it is configured as a control valve for the variable capacity compressor that changes the capacity of the refrigerant discharged from the variable capacity compressor,
The valve body is configured to contact and separate from the valve seat so as to adjust a refrigerant flow rate when a part of the refrigerant discharged from the variable capacity compressor flows into the crank chamber. The solenoid valve according to claim 1.   The case is formed of a bottomed cylindrical body formed by pressing, and the bottom portion constitutes the wall portion, and the screw portion of the core is formed on the body side from the hole portion formed in the center of the bottom portion. The solenoid valve according to claim 1, wherein the solenoid valve is configured to be exposed.   2. The solenoid valve according to claim 1, wherein the magnetic reinforcing plate is fixed to the core via a rotation prevention structure that prevents rotation around an axis.   5. The electromagnetic valve according to claim 4, wherein the rotation prevention structure is a saw blade structure that is provided at a connection portion between the core and the magnetic reinforcing plate, and is fitted to each other.   The magnetic reinforcing plate is configured by arranging a plurality of leg portions extending toward an inner peripheral surface of the case on an outer peripheral edge portion of the main body, and between at least any of the adjacent leg portions of the plurality of leg portions. The electromagnetic valve according to claim 1, wherein the fitting portion is configured by the formed gap portion. The magnetic reinforcing plate has a substantially constant thickness,
The electromagnetic valve according to claim 6, wherein a width of the leg portion is configured to increase inward from an outer peripheral portion of the magnetic reinforcing plate.   The electromagnetic valve according to claim 1, wherein the fitting portion of the magnetic reinforcing plate is composed of a plurality of holes or grooves provided in the main body. In the solenoid valve that adjusts the flow rate of the refrigerant introduced from the upstream side and leads it to the downstream side,
A body having a passage for the refrigerant formed therein;
In order to adjust the flow rate of the refrigerant flowing from the upstream side to the downstream side, a valve body that contacts and separates from a valve seat formed in the body;
A shaft that supports the valve body in the axial direction;
A core that is fixed to the body via a screw part and is coaxially inserted into the shaft, and disposed on the opposite side of the screw part of the core, and transmits a driving force to the valve body via the shaft. A plunger, a sleeve made of the magnetic core and a non-magnetic material extrapolated to the plunger, an electromagnetic coil that is extrapolated to the sleeve and generates a magnetic circuit including the plunger and the core when energized, and around the electromagnetic coil A solenoid composed of a case functioning as a yoke,
With
The case is connected to the core through a rotation prevention structure at a joint portion with the body, and the case is rotated so that the core is screwed into the body, and the case is attached to the body. A solenoid valve configured to be fixed.

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