JP2017129171A - Electromagnetic valve - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide an electromagnetic valve in which a ball valve (a valve body) is moved by a rod 311 to open and close a valve port and which secures the positioning and concentricity of a tip of the rod 311 while stabilizing the fixing and holding power of the rod 311 with respect to a plunger 31.SOLUTION: A plunger 31 is formed of a plunger body 31A and a circular column part 31B. The rod 311 is a stainless steel rod member with an outer diameter conforming with the bore of a rod insertion hole 31a. The rod 311 is inserted into the rod insertion hole 31a so as to abut the deepest part. On an edge face 31B1 on the opening part side of the rod insertion hole 31a of the plunger 31, three portions positioned on a circle S1 around an axis L at equal intervals are caulked.SELECTED DRAWING: Figure 2

Description

  The present invention relates to, for example, an electromagnetic valve that is closed by energization of an electromagnetic coil and is opened by de-energization.

  Conventionally, this type of solenoid valve is an energized closed solenoid valve, for example, one disclosed in Japanese Utility Model Publication No. 8-5431 (Patent Document 1). FIG. 9 is a diagram showing a conventional energized closed solenoid valve disclosed in FIG. 2 of Patent Document 1. This energized closed solenoid valve is used for main cooling when rapid cooling is required, for example, in a domestic refrigerator-freezer. The refrigerant supply to the cooler is cut off to supply all the refrigerant only to the quick cooler, and it is a small one that can be energized and closed only when necessary.

  In this solenoid valve, a valve chamber a1 and a plunger chamber a2 are formed in the valve body a by cutting or the like, and a cylindrical plunger tube a3 extending from the plunger chamber a2 toward the electromagnetic drive unit b is integrated with the valve body a. Is formed. The plunger b1 of the electromagnetic drive unit b is inserted into the plunger tube a3, and the suction element b2 is fixed to the end of the plunger tube a3. In the valve body a, a valve seat a4 and a valve port a5 are formed between the valve chamber a1 and the plunger chamber a2. A ball valve c as a “valve element” is disposed in the valve chamber a1.

  Further, the ball valve c is disposed with a valve spring e in a cylindrical guide d1 formed in the blind plug d, and the blind plug d is screwed into an end portion of the valve chamber a1 (valve body a) so as to be in the valve chamber a1. Is sealed. The valve port a5 has a structure that allows the valve chamber a1 and the plunger chamber a2 to communicate with each other. A rod b3 inserted into the rod insertion hole b11 is attached to the end of the plunger b1. The rod b3 is in contact with the ball valve c through the valve port a5. Further, a primary side joint f communicating with the valve chamber a1 and a secondary side joint g communicating with the plunger chamber a2 are attached to the valve body a.

  That is, the fluid that has entered the valve chamber a1 from the primary side joint f is directed to the secondary side joint g through the valve port a5, and when the electromagnetic coil b4 of the electromagnetic drive unit b is energized, the plunger b1 is attracted. The ball valve c is pushed up by the valve spring e and is closed by the valve port a5 of the valve seat a4. When the electromagnetic coil b4 is deenergized, the plunger b1 is separated from the attractor b2 by the spring force of the coil spring b5, the rod b3 moves the ball valve c, and the valve port a5 is opened.

No. 8-5431

  In the conventional solenoid valve, when the rod b3 is attached to the plunger b1, the rod b3 is press-fitted into the rod insertion hole b11 formed in the plunger b1. For this reason, the combination of the inner diameter of the rod insertion hole b11 and the diameter of the rod b3 causes variations in the fixing and holding force of the rod b3, the position of the tip of the rod b3 with respect to the plunger b1, and the concentricity of the plunger b1 and rod b3. There was a problem that management became difficult.

  According to the present invention, a rod is provided on a plunger of an electromagnetic drive unit, the rod is brought into contact with a valve body through a valve port, and the rod is moved by the rod to open and close the valve port. It is an object of the present invention to provide an electromagnetic valve that stabilizes the force and can easily ensure the positioning and concentricity of the tip of the rod.

  The electromagnetic valve according to claim 1 is provided with a rod on a plunger of an electromagnetic drive unit, a valve body on one side of a valve port through which fluid flows, the rod abutting on the valve body through the valve port, and the plunger. An electromagnetic valve for moving the valve body in the axial direction of the plunger to move the valve body to open and close the valve port, wherein a rod insertion hole is formed on the axial line of the plunger, and the rod insertion The rod is inserted into a hole, and is fixed by caulking on a circumference around the axis of the plunger, and the plunger is provided with a concave groove.

  The electromagnetic valve according to claim 2 is the electromagnetic valve according to claim 1, wherein the concave groove is provided on the circumference of the end surface of the plunger on the opening side of the rod insertion hole. And

  The electromagnetic valve according to claim 3 is the electromagnetic valve according to claim 1, wherein the plunger has a cylindrical portion centered on the axis, and the concave groove is formed on the circumference of the outer periphery of the cylindrical portion. It is provided.

  A solenoid valve according to a fourth aspect is the electromagnetic valve according to the second or third aspect, wherein a plurality of the concave grooves are provided.

  A solenoid valve according to a fifth aspect is the electromagnetic valve according to the fourth aspect, wherein an odd number of the concave grooves are provided.

  A solenoid valve according to claim 6 is the solenoid valve according to any one of claims 1 to 5, wherein an equal position around the circumference of the circumference around the axis is fixed by caulking. It is characterized by being.

  A solenoid valve according to a seventh aspect is the electromagnetic valve according to the second or third aspect, wherein the concave groove is provided on the entire circumference of the circumference.

  An electromagnetic valve according to claim 8 is the electromagnetic valve according to claim 3, wherein the rod has a constricted portion on an outer periphery of a portion inserted into the rod insertion hole, and is outside the constricted portion of the plunger. The concave groove is provided on the circumference of.

  The electromagnetic valve according to claim 9 is provided with a rod on a plunger of an electromagnetic drive unit, a valve body on one side of a valve port through which fluid flows, the rod abutting on the valve body through the valve port, and the plunger An electromagnetic valve that moves the valve body by moving the rod in the axial direction of the plunger and opens and closes the valve port, wherein a rod insertion hole is formed on the axis of the plunger, and the rod is The rim of the opening end of the rod insertion hole of the plunger is caulked toward the axis in a state having an enlarged diameter portion, and the enlarged diameter portion is inserted into the rod insertion hole. To do.

  According to the electromagnetic valve of the first to eighth aspects, the rod is inserted into the rod insertion hole on the axis of the plunger, and is caulked and fixed on the circumference around the axis of the plunger, and the concave groove is formed on the circumference. A rod is fixed to the plunger. Therefore, stress is applied by plastic deformation by caulking and fixing the plunger around the rod, and the rod is held with a predetermined force. In addition, for example, the rod can be caulked with the rod inserted to the bottom of the rod insertion hole, and the axial position of the rod end relative to the plunger can be accurately set by setting the rod insertion hole depth and rod length. can do.

  According to the solenoid valve of the second aspect, since the concave groove is provided in the end surface of the plunger rod insertion hole on the opening side, the position close to the rod can be caulked and fixed. Can be adjusted easily.

  According to the electromagnetic valve of the third aspect, in addition to the effect of the first aspect, since the concave groove is provided on the outer periphery of the cylindrical portion of the plunger, it is caused by the stress of plastic deformation in the direction orthogonal to the axis of the rod. The fixed holding force can be applied reliably.

  According to the solenoid valve of the fourth aspect, in addition to the effect of the second or third aspect, the stress due to plastic deformation of the plurality of concave grooves at equal positions on the circumference complements each stress bias. , Fixed holding power and concentricity.

  According to the solenoid valve of claim 5, in addition to the effect of claim 4, the stress due to plastic deformation of the odd number of concave grooves at equal positions on the circumference mutually complements the bias of each stress, Fixed holding force and concentricity can be obtained.

  According to the solenoid valve of the sixth aspect, in addition to the effect of any one of the first to fifth aspects, the uniform position around the circumference around the axis is fixed by caulking. Concentricity can be secured.

  According to the electromagnetic valve of the seventh aspect, in addition to the effect of the second or third aspect, since the concave grooves are provided on the entire circumference, the stress due to the caulking plastic deformation is evenly distributed around the rod. Since it can be added, a fixed holding force and concentricity can be obtained.

  According to the electromagnetic valve of the eighth aspect, in addition to the effect of the third aspect, the plastically deformed portion of the plunger bites into the constricted portion of the rod, so that the rod can be prevented from coming off.

  According to the electromagnetic valve of the ninth aspect, the rod can be fixed to the plunger only by caulking the rim at the opening end portion of the rod insertion hole toward the diameter-expanded portion side of the rod, so that the assembly work of the electromagnetic valve is facilitated. .

It is a longitudinal cross-sectional view of the valve open state of the energization closed type solenoid valve concerning a 1st embodiment of the present invention. It is a figure which shows the fixing structure of the plunger and rod in 1st Embodiment. It is a figure which shows the modification 1 and the modification 2 of the fixing structure of the plunger and rod in 1st Embodiment. It is a figure which shows the fixation structure of the plunger and rod of an electricity supply closed type solenoid valve which concerns on 2nd Embodiment of this invention. It is a figure which shows the fixing structure of the plunger and rod of an electricity supply closed type solenoid valve which concerns on 3rd Embodiment of this invention. It is a figure which shows the fixation structure of the plunger and rod of an electricity supply closed type solenoid valve which concerns on 4th Embodiment of this invention. It is a figure which shows the fixing structure of the plunger and rod of the energization closed type solenoid valve of the reference examples 1 and 2. FIG. It is a figure which shows the fixing structure of the plunger and rod of the energization closed electromagnetic valve of Reference Examples 3 and 4. It is a longitudinal cross-sectional view which shows an example of the conventional electricity supply closed type solenoid valve.

  Next, an embodiment of a solenoid valve of the present invention will be described with reference to the drawings. FIG. 1 is a longitudinal sectional view of the energized closed solenoid valve according to the first embodiment in a valve open state, and this energized closed solenoid valve is an example of the solenoid valve of the present invention. Note that the concept of “upper and lower” in the following description corresponds to the upper and lower sides in the drawing of FIG.

  The energization closed solenoid valve 10 according to this embodiment has a valve body 1 made of metal such as brass. The valve body 1 includes a valve chamber 11, a plunger chamber 12, an insertion hole 13 communicating with the valve chamber 11 and the plunger chamber 12, a plunger tube mounting hole 14, a pipe connection hole 15, and a pipe connection hole 16. However, it is formed by cutting. The valve body 1 is formed with an annular receiving seat 17 between the valve chamber 11 and the plunger chamber 12 by forming an insertion hole 13. That is, the receiving seat part 17 has the insertion hole 13 in the center. Further, the plunger chamber 12 has a cylindrical portion 18 centering on an axis L having a diameter larger than that of the receiving seat portion 17. Among these, the valve chamber 11, the plunger chamber 12, the insertion hole 13, the plunger tube mounting hole 14, the pipe connection hole 15, the receiving seat portion 17, and the cylindrical portion 18 are formed coaxially about the axis L. The axis L is also an axis passing through the center of a plunger 31 described later.

  A stainless steel cylindrical plunger tube 3 a of an electromagnetic drive unit 3 described later is attached to the plunger tube mounting hole 14. A primary side joint 15a into which a fluid flows is attached to the pipe connection hole 15 as shown by an arrow, and a secondary side joint 16a from which a fluid flows out is attached to the pipe connection hole 16 as shown by an arrow. The primary side joint 15a is communicated with the valve chamber 11 via the primary port 15b, and the secondary side joint 16a is communicated with the plunger chamber 12 via the secondary port 16b. The plunger tube 3a, the primary side joint 15a, and the secondary side joint 16a are connected to the valve body 1 by brazing around the open ends of the plunger mounting hole 14, the pipe connection hole 15, and the pipe connection hole 16, respectively. The main body 1 is fixed.

  A valve assembly 2 is accommodated in the valve chamber 11. The valve assembly 2 is made of a metal-made substantially cylindrical holder portion 21, a metal ball valve 22 as a “valve element”, a thin cylindrical lid member 23, and a valve spring 24. The holder portion 21 is configured by integrally forming a valve seat portion 21A having a valve port 25 at the center and a cylindrical valve guide portion 21B having an inner diameter matching the outer diameter of the ball valve 22. Then, the ball valve 22 is fitted into the valve guide portion 21B via the valve spring 24, the lid member 23 is fitted from the end portion of the valve guide portion 21B, and the end portion of the valve guide portion 21B is caulked to thereby close the lid. The member 23 is fixed. The lid member 23 may be a prismatic member or the like as will be described later.

  Thereby, in the valve assembly 2, the ball valve 22 is held in the holder portion 21 and is guided by the valve guide portion 21B so as to move only in the direction of the axis L. A passage 21Ba for communicating the valve chamber 11 and the valve port 25 is formed on the side of the valve guide portion 21B on the valve seat portion 21A side. Further, the valve guide portion 21B is formed with a flow path 21Bb for flowing the liquid accumulated under the ball valve 22 to the valve chamber 11 side. The lid member 23 has a thin cylindrical shape, but a similar lid member may be a prismatic member such as a hexagonal prism or a quadrangular prism. In this case, even after the end portion of the valve guide portion 21B is caulked, the liquid accumulated under the ball valve 22 can be flowed to the valve chamber 11 side by the side portion of the prismatic column, similarly to the flow path 21Bb. Furthermore, the side surface of the columnar member may be provided with a vertical groove for flowing liquid toward the valve chamber 11. Of course, in these cases, the flow path 21Bb may or may not be present.

  The valve seat portion 21A has a tapered surface 21Aa whose diameter increases as the distance from the valve guide portion 21B increases. Furthermore, an internal thread portion 18a is formed on the inner periphery of the cylindrical portion 18 of the valve body 1, and an external thread portion 21Ab that engages with the internal thread portion 18a is formed on the outer periphery of the valve seat portion 21A. As a result, the valve guide portion 21B is inserted into the insertion hole 13, the tapered surface 21Aa of the valve seat portion 21A is brought into contact with the inner end portion (opening end portion of the insertion hole 13) of the receiving seat portion 17, and the male screw portion 21Ab. Is fixed to the valve main body 1 by screwing into the female screw portion 18a. The tapered surface 21Aa of the valve seat portion 21A and the inner end portion of the receiving seat portion 17 seal between the valve chamber 11 and the plunger chamber 12. A seal member may be disposed between the receiving seat portion 17 and the tapered surface 21Aa. A minus groove 21Ac is formed at the end of the valve seat portion 21A to engage a jig when screwed.

  In the electromagnetic drive unit 3, a plunger 31 is inserted into the plunger tube 3a, and the plunger 31 is disposed so as to be slidable in the direction of the axis L (vertical direction). A plunger 3b is fitted to the upper end of the plunger tube 3a, and a plunger spring 3c that urges the plunger 31 in a direction away from the plunger 3b is disposed between the plunger 31 and the plunger 3b. Yes. An electromagnetic coil 3e is disposed on the outer periphery of the plunger tube 3a via a bobbin 3d, and the electromagnetic coil 3e and the bobbin 3d are molded with a resin 3f on the outer periphery thereof. Further, the bobbin 3d and the resin 3f are covered with an outer box 3g and a magnetic guide 3h, and the outer box 3g is screwed to the attractor 3b with a screw N at the top. A lead wire 3i for energizing the electromagnetic coil 3e is drawn out of the outer box 3g. The plunger 31, the attractor 3b, the outer box 3g, and the magnetic guide 3h are each made of a magnetic material. The suction element 3b is fixed to the stainless steel plunger tube 3a by welding the entire circumference of the joint portion indicated by the symbol “P” in the drawing. Thereby, the inside of the plunger tube 3a is airtightly sealed.

  As will be described later, a rod insertion hole 31a is formed on the valve assembly 2 side of the plunger 31, and a rod 311 (round bar) is attached to the rod insertion hole 31a. The rod 311 is inserted into the valve port 25 of the valve seat portion 21 </ b> A, and the end of the rod 311 is in contact with the ball valve 22. The mounting structure of the plunger 31 and the rod 311 will be described later.

  In FIG. 1, the electromagnetic drive unit 3 is in a non-energized state, and the plunger 31 presses the ball valve 22 downward with the rod 311 by the urging force of the plunger spring 3 c and the weight of the plunger 31. Thereby, the ball valve 22 is separated from the valve seat portion 21A, and the valve port 25 is in the valve open state. When the electromagnetic coil 3e of the electromagnetic drive unit 3 is energized, the plunger 31 is attracted to the attractor 3b side against the biasing force of the plunger spring 3c, and the ball valve 22 together with the plunger 31 and the rod 311 is biased by the biasing force of the valve spring 24. Rises and sits on the valve seat portion 21A, and the valve port 25 is closed.

  2A and 2B are diagrams showing a structure for fixing the plunger and the rod in the first embodiment. FIG. 2A is a partial longitudinal sectional view of the plunger and the rod, and FIG. 2B is a bottom view of the plunger and the rod. . As shown in FIG. 2, the plunger 31 is formed by integrally forming a plunger main body 31A having a diameter matching the inner diameter of the plunger tube 3a and a columnar portion 31B having a smaller diameter than the plunger main body 31A. The plunger main body 31A and the cylindrical portion 31B are centered on the axis L. A cylindrical rod insertion hole 31a centering on the axis L is formed at the center of the cylindrical portion 31B. The rod 311 is an outer diameter stainless steel rod member that matches the inner diameter of the rod insertion hole 31a, and both ends of the rod 311 are flat surfaces orthogonal to the axis L. The rod 311 is inserted into the rod insertion hole 31a so as to abut the farthest. And in the end surface 31B1 of the cylindrical portion 31B of the plunger 31 on the opening side of the rod insertion hole 31a, three places located at equal positions on the circumference S1 with the axis L as the center are caulked.

  The caulking portion 312 as a “concave groove” formed by caulking has an arc shape as shown in FIG. 2B, and is on the circumference S1 centering on the axis L surrounding the rod insertion hole 31a. 3 are formed at equal intervals. That is, the base material of the plunger 31 is plastically deformed toward the rod insertion hole 31 a in the caulking portion 312, and stress due to this plastic deformation is applied to the rod 311, and the rod 311 is fixed to the plunger 31. Note that, as in the first embodiment, other embodiments described later, and modifications, the process of caulking a part of the plunger and fixing the rod is an example of a process called “caulking and fixing”.

  Thus, since the end surface 31B1 on the opening side of the rod insertion hole 31a of the plunger 31 is caulked, a position close to the rod 311 can be caulked. Therefore, the fixed holding force and concentricity with respect to the rod 311 can be easily adjusted. The same applies to Modification 1 and Modification 2 below. In addition, since three equal places on the circumference S1 centered on the axis L are caulked, the stress due to plastic deformation at the three places complements each other's bias, and the fixed holding force, concentricity Sex is obtained. The same applies to the following modified example 2.

  FIG. 3 is a diagram showing a first modification and a second modification of the fixing structure of the plunger 31 and the rod 311. In the following modified examples 1 and 2, second to fourth embodiments, and reference examples 1 to 4, only the plunger and the rod will be described, but the overall configuration of the energized closed solenoid valve is shown in FIG. The same as in the first embodiment. In addition, the same elements as those in the first embodiment and corresponding elements are denoted by the same reference numerals, and the elements denoted by the same reference numerals have the same structure and the same operational effects, and overlapping descriptions are appropriately described. Omitted.

  In Modification 1 of FIG. 3A, the entire circumference on the circumference S1 centering on the axis L is caulked, and the caulking portion 313 that is circular on the entire circumference on the circumference S1 surrounding the rod insertion hole 31a. Is formed. Since the entire circumference is caulked in this way, stress due to caulking plastic deformation can be applied evenly around the rod 311, so that a fixed holding force and concentricity can be obtained. Modification 2 of FIG. 3 (B) is obtained by caulking three places at equal positions on the circumference S1 ′ around the axis L on the end surface 31B1 of the cylindrical portion 31B. Three points 314 are formed at equal intervals on the circumference S1 ′.

  FIG. 4 is a view showing a fixing structure of the plunger and the rod of the energization closed solenoid valve according to the second embodiment of the present invention. 4A is a partial longitudinal sectional view of the plunger and the rod, and FIG. 4B is a bottom view of the plunger and the rod. The plunger 32 of the second embodiment is formed by integrally forming a plunger main body 32A having a diameter matching the inner diameter of the plunger tube 3a and a cylindrical portion 32B having a smaller diameter than the plunger main body 32A. A rod 321 is provided.

  And in this 2nd Embodiment, it caulks on circumference S2 of the perimeter of cylindrical part 32B by roll caulking processing. Thereby, a groove-shaped caulking portion 322 as a “concave groove” is formed on the entire outer periphery of the cylindrical portion 32B. Thus, since the outer periphery of the cylindrical portion 32B of the plunger 32 is caulked, a fixed holding force can be reliably applied to the rod 321 by the stress of plastic deformation in the direction orthogonal to the axis L. .

  FIG. 5 is a view showing a fixing structure of the plunger and the rod of the energization closed solenoid valve according to the third embodiment of the present invention. FIG. 5A is a partial longitudinal sectional view of the plunger and the rod, and FIG. 5B is a bottom view of the plunger and the rod. The plunger 33 according to the third embodiment is formed by integrally forming a plunger main body 33A having a diameter matching the inner diameter of the plunger tube 3a and a cylindrical portion 33B having a smaller diameter than the plunger main body 33A. A rod 331 is provided. In the third embodiment, a part of the rod 331 has a constricted portion 331a.

  And like 2nd Embodiment, it is made to caulk the circumference | surroundings S3 of the outer periphery of the cylindrical part 33B in the position of the narrow part 331a by the roll caulking process. Thereby, the groove-shaped crimp part 332 is formed in the outer periphery of the cylindrical part 33B. In addition, a plastically deformed portion (base material) of the cylindrical portion 33B bites into the constricted portion 331a. Thereby, the rod 331 can be prevented from coming off. Further, since the outer periphery of the cylindrical portion 33B is caulked, a fixed holding force can be reliably applied to the rod 331 by the stress of plastic deformation in the direction orthogonal to the axis L.

  FIG. 6 is a view showing a structure for fixing a plunger and a rod of an energized closed solenoid valve according to a fourth embodiment of the present invention. 6A is a partial longitudinal sectional view of the plunger and the rod, and FIG. 6B is a bottom view of the plunger and the rod. The plunger 34 according to the fourth embodiment is formed by integrally forming a plunger main body 34A having a diameter matching the inner diameter of the plunger tube 3a and a cylindrical portion 34B having a smaller diameter than the plunger main body 34A. A rod 341 is provided. The rod 341 of the fourth embodiment has a large-diameter enlarged portion 341a. The cylindrical portion 34B of the plunger 34 has a rod insertion hole 34a for inserting the enlarged diameter portion 341a, and a rim 342 at the opening end of the rod insertion hole 34a. The length in the axis L direction of the enlarged diameter portion 341a is the same as the depth of the rod insertion hole 34a.

  In the fourth embodiment, the enlarged diameter portion 341a of the rod 341 is inserted into the rod insertion hole 34a, and the rim 342 of the cylindrical portion 34B is caulked toward the enlarged diameter portion 341a. Since the rod 341 can be fixed to the plunger 34 simply by caulking the rim 342 at the opening end of the rod insertion hole 34a toward the diameter-expanded portion 341a of the rod 341, the assembly work of the energized closed solenoid valve is facilitated.

  FIG. 7 is a view showing a structure for fixing the plunger and the rod of the energized closed solenoid valve of Reference Example 1 and Reference Example 2. The plunger 35 of Reference Example 1 in FIG. 7A is formed by integrally forming a plunger main body 35A having a diameter matching the inner diameter of the plunger tube 3a and a columnar portion 35B having a smaller diameter than the plunger main body 35A. A rod 351 is provided on the cylindrical portion 35B. The rod 351 of the reference example 1 has a blade 351a at the end on the rod insertion hole 35a side. In addition, a flat hole 35a1 is provided at the innermost end of the rod insertion hole 35a. In the first reference example, the rod 351 is press-fitted into the rod insertion hole 35 a, so that the blade 351 a is caulked and expanded in the flat hole 35 a 1, and the rod 351 is fixed to the plunger 35.

  The plunger 36 of Reference Example 2 in FIG. 7B is formed by integrally forming a plunger main body 36A having a diameter that matches the inner diameter of the plunger tube 3a and a cylindrical portion 36B having a diameter smaller than that of the plunger main body 36A. A rod 361 is provided on the cylindrical portion 36B. In Reference Example 2, the rod 361 is fixed to the plunger 36 by inserting the rod 361 into the rod insertion hole 36a and compressing the outer periphery of the cylindrical portion 36B.

  FIG. 8 is a diagram showing a fixing structure of the plunger and the rod of the energization closed solenoid valve of Reference Example 3 and Reference Example 4. The plunger 37 of Reference Example 3 in FIG. 8A is formed by integrally forming a plunger main body 37A having a diameter matching the inner diameter of the plunger tube 3a and a cylindrical portion 37B having a smaller diameter than the plunger main body 37A. A rod 371 is provided on the cylindrical portion 37B. In the reference example 3, the rod 371 is fixed to the plunger 37 by inserting the rod 371 into the rod insertion hole 37a and brazing around the opening of the rod insertion hole 37a.

  In the plunger 38 of Reference Example 4 in FIG. 8B, a plunger main body 38A having a diameter matching the inner diameter of the plunger tube 3a, a cylindrical portion 38B having a smaller diameter than the plunger main body 38A, and a rod-shaped rod 381 are integrated. Formed. The rod 381 is subjected to a surface treatment to harden the rod 381.

  The energized closed solenoid valve has a structure in which a rod for operating a ball valve is inserted into a valve port, and the rod is a rod-shaped member having a small diameter. Further, since the rod frequently operates the ball valve, the rod is required to be a robust member so as not to bend. On the other hand, the plunger is required to be workable. For this reason, the plunger in each embodiment is made of iron (soft iron), and the rod is preferably made of a material that is hard and easily obtains dimensional accuracy. Under such circumstances, a structure for fixing the rod to the plunger is required, and this is easily realized by the respective embodiments. In the reference example 4, the rod 381 is integrally formed as the plunger 38, thereby improving the dimensional accuracy of the rod 381 and further curing the rod 381 by surface treatment.

  Combinations of the above embodiments and modifications are also embodiments of the present invention. For example, in the first embodiment and the second modification, three recesses are formed, but two may be used, or a plurality of four or more may be used. Among these, an odd number may be sufficient as a recessed part. Moreover, you may make it provide these several recessed parts in the outer periphery of the cylindrical part of a plunger like 2nd Embodiment and 3rd Embodiment.

  Further, in the above embodiment, the example in which the valve body is a ball valve has been described. However, if the valve body is disposed on the valve chamber side with respect to the valve seat portion, the valve body may have another shape. Good. For example, it may be a cylindrical valve or a needle valve having a tapered surface at the end.

  In the embodiment, since the valve spring is provided in the valve assembly, the valve closed state can be reliably maintained even with a low differential pressure, and chattering due to a pressure change can be prevented. However, in the energized closed solenoid valve, the valve body can also close the valve port by the pressure of the fluid flowing from the primary side, and in such a case, there is no need for the valve spring.

  As described above, the embodiments of the present invention have been described in detail with reference to the drawings. However, the specific configuration is not limited to these embodiments, and the design can be changed without departing from the scope of the present invention. Is included in the present invention.

DESCRIPTION OF SYMBOLS 1 Valve body 11 Valve chamber 12 Plunger chamber 15a Primary side joint 16a Secondary side joint 2 Valve assembly 21 Holder part 22 Ball valve (valve body)
23 Lid member 24 Valve spring 25 Valve port 3 Electromagnetic drive unit 31 Plunger 31a Rod insertion hole 311 Rod 32 Plunger 32a Rod insertion hole 321 Rod 33 Plunger 33a Rod insertion hole 331 Rod 34 Plunger 34a Rod insertion hole 341 Rod 10 Energized closed electromagnetic valve

Claims (9)

The electromagnetic drive unit includes a rod on the plunger, and a valve body on one side of the valve port through which fluid flows, the rod abutting on the valve body through the valve port, and the rod together with the plunger in the axial direction of the plunger An electromagnetic valve that moves the valve body to open and close the valve port,
A rod insertion hole is formed on the axis of the plunger, the rod is inserted into the rod insertion hole, and is fixed by caulking on a circumference around the axis of the plunger, so that a concave groove is formed in the plunger. A solenoid valve characterized by being provided.   2. The solenoid valve according to claim 1, wherein the concave groove is provided on the circumference of the end surface of the plunger on the opening side of the rod insertion hole.   The solenoid valve according to claim 1, wherein the plunger has a cylindrical portion centered on the axis, and the concave groove is provided on the circumference of the outer periphery of the cylindrical portion.   The electromagnetic valve according to claim 2, wherein a plurality of the concave grooves are provided.   The electromagnetic valve according to claim 4, wherein an odd number of the concave grooves are provided.   6. The solenoid valve according to claim 1, wherein an equal position around the circumference of the circumference around the axis is fixed by caulking. 6.   The solenoid valve according to claim 2 or 3, wherein the concave groove is provided on the entire circumference of the circumference.   It has a constriction part in the outer periphery of the part inserted in the rod insertion hole of the rod, The concave groove is provided on the circumference outside the constriction part of the plunger. Item 4. The solenoid valve according to Item 3. The electromagnetic drive unit includes a rod on the plunger, and a valve body on one side of the valve port through which fluid flows, the rod abutting on the valve body through the valve port, and the rod together with the plunger in the axial direction of the plunger An electromagnetic valve that moves the valve body to open and close the valve port,
A rod insertion hole is formed on the axis of the plunger, the rod has an enlarged diameter portion, and the enlarged diameter portion is inserted into the rod insertion hole. A solenoid valve characterized in that a rim at an open end is caulked toward the axis.

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