JP4146973B2 - Assembling method of solenoid valve - Google Patents

Description

[0001]
BACKGROUND OF THE INVENTION
The present invention relates to a method for assembling a small solenoid valve used to control the flow of a liquid such as a small amount of chemical liquid.
[0002]
[Prior art]
Conventionally, a small solenoid valve for controlling the flow of a small amount of chemical liquid or the like has been used in medical equipment, physics and chemistry equipment, and the like. An example of such a small solenoid valve is a solenoid valve 100 as shown in FIG. The electromagnetic valve 100 includes an actuator part A in which an electromagnetic coil 101 is incorporated and a body B in which a flow path 111 is formed. An input port 102 and an output port 103 communicating with the flow path 111 are externally connected to the body B, respectively. Is open.
[0003]
In the actuator part A, a first core 105 and a second core 106 are arranged at both ends of the center hole 101a of the electromagnetic coil 101, respectively. The first core 105 covers the upper end surface of the electromagnetic coil 101 in the figure, and the protrusion 105a is inserted into the center hole 101a. The second core 106 covers the lower end surface of the electromagnetic coil 101 in the figure, and a plunger 104 is provided in a guide hole 106a provided at the center thereof so that the plunger 104 can reciprocate.
[0004]
The plunger 104 is guided so as to be slidable in the vertical direction in the guide hole 106 a and is urged downward by a spring 107. Further, a diaphragm 108 constituting a valve body is fixed to a lower end portion of the plunger 104 via a projecting portion 108 a provided at the center thereof, and moves up and down together with the plunger 104. The outer edge of the diaphragm 108 is sandwiched and fixed between the body B and the second core 106.
[0005]
Accordingly, the electromagnetic coil 101 is demagnetized and the plunger 104 is urged downward by the spring 107, so that the diaphragm 108 comes into contact with the valve seat 109 provided in the body B and the flow path 111 is closed. Further, when the electromagnetic coil 101 is excited and the plunger 104 moves upward against the spring 107, the diaphragm 108 is separated from the valve seat 109 and the flow path 111 is opened.
[0006]
The electromagnetic coil 101, the first core 105, the second core 106, the plunger 104, and the like are accommodated in a bottomed cylindrical bonnet 110. The inner periphery of the skirt 110 is bonded and fixed to the outer periphery of the second core 106 with an adhesive 112. The actuator part A is screwed to the body B. Here, the distance between the lower end surface 105 b of the first core 105 and the bottom surface 106 b of the second core 106 is defined as a coil depth H. The coil depth H corresponds to the distance between the first core 105 and the second core 106, and determines the magnitude of the magnetic force acting on the plunger 104 and the distance that the plunger 104 can move. Therefore, the coil depth H affects the movement of the diaphragm 108 that is the valve body, and affects the opening degree and responsiveness of the electromagnetic valve 100.
[0007]
[Problems to be solved by the invention]
However, in the conventional solenoid valve 100, since the fixing method of the second core 106 and the bonnet 110 is by the adhesive 112, the dropout strength of the second core 106 is reduced due to the deterioration of the adhesive 112. There was a fear. In addition, the second core 106 may be moved immediately after bonding, or the second core 106 may be slightly displaced by an external force during use, so that the adjustment accuracy of the coil depth H may be deteriorated.
[0008]
On the other hand, for example, a method of R caulking the open end of the bonnet 110 toward the bottom surface 106b of the second core 106 is also conceivable. However, in this case, although the pull-out strength of the second core 106 is increased, there is a possibility that the adjustment of the coil depth H may be difficult. This is because the accuracy of the amount of caulking at the opening end of the bonnet 110 is difficult to obtain.
[0009]
Alternatively, a method may be considered in which a male screw and a female screw are provided on the inner periphery of the skirt portion of the bonnet 110 and the outer periphery of the second core 106, respectively, and they are fastened and fixed to each other. However, in this case, although the pull-out strength of the second core 106 is increased, there is a problem that it takes time to process the male screw and the female screw, and the manufacturing process becomes complicated. In particular, in order to obtain a precise coil depth H, high accuracy is required for screw machining.
[0010]
The present invention has been made in view of the above circumstances, and the object thereof is to easily adjust the coil depth by the core with high accuracy and to ensure the removal strength of the core relative to the hood relatively easily. It is an object of the present invention to provide a method for assembling an electromagnetic valve that makes possible the above.
[0011]
[Means for Solving the Problems]
In order to achieve the above-mentioned object, the invention described in claim 1 is characterized in that the electromagnetic coil, the first core disposed at one end of the central hole of the electromagnetic coil, and the other end of the central hole of the electromagnetic coil A plunger that is reciprocated toward the end surface of one core; a second core that is disposed at the other end of the central hole of the electromagnetic coil and that has a guide hole that guides the movement of the plunger; and the plunger. A valve body, a body including a valve seat that is opened and closed by the valve body, and a bonnet for accommodating the electromagnetic coil, the first core, and the plunger, and the electromagnetic coil, the first core, and the plunger are accommodated in the bonnet In addition, in the method of assembling the solenoid valve , the coil depth between the first core and the second core is set to a predetermined value by fixing the second core inside the opening of the bonnet. , said coil A first step of inserting the second core into a work table jig having a projection of the same size as the height, a wave washer and the bonnet in advance to the work table jig A second step of superimposing a bonnet assembly fixed inside and a coil assembly in which a coil winding is wound around a coil bobbin in advance and molded with a resin so that the coil assembly is inserted into the bonnet assembly; By pressing the bonnet assembly against the work table jig with a holding jig, the bottom of the bonnet is fitted to the outer periphery of the second core, and the first core and the work table jig protrude. The bonnet assembly is compressed by a caulking jig in a state where the bonnet assembly is pressed by the pressing jig, And caulked fourth step to said second outer circumference which is formed in the circumferential groove of the core N'netto, and purpose, further comprising: a.
[0012]
According to the configuration of the above invention, the plunger is guided by the guide hole of the second core and reciprocates toward the end surface of the first core. Therefore, the distance between the first core and the second core, that is, The moving distance of the plunger is determined by the coil depth. Further, since the valve seat of the body is opened and closed by the valve body provided on the plunger, the movement distance of the plunger affects the opening degree and responsiveness as the electromagnetic valve. Here, since the first core is housed in the hood, the first core can be accurately positioned on the hood. Therefore, the coil depth is determined by the positional relationship between the second core and the bonnet.
In the present invention, the second core is simply fitted into the opening inside the bonnet and the bonnet is caulked in the circumferential groove of the core, so that the second core is mechanically accurately positioned with respect to the bonnet. Moreover, the caulking amount can be easily managed by setting the depth of the circumferential groove and the caulking strength.
[0013]
DETAILED DESCRIPTION OF THE INVENTION
DESCRIPTION OF THE PREFERRED EMBODIMENTS Hereinafter, an embodiment embodying a method for assembling an electromagnetic valve according to the present invention will be described in detail with reference to the drawings. In FIG. 1, sectional drawing of the solenoid valve 1 which concerns on this Embodiment is shown.
[0014]
The internal structure of the electromagnetic valve 1 is the same as that of the conventional one, and includes an actuator part A in which an electromagnetic coil 11 is incorporated and a body B in which a flow path 4 is formed. The body B is provided with an input port 2 and an output port 3 that communicate with the flow path 4, and a valve seat 5 is provided in the middle of the flow path 4.
[0015]
The actuator part A includes a plunger 12 provided so as to be able to reciprocate in the central hole 11a of the electromagnetic coil 11, a first core 13 and a second core 14 disposed at both upper and lower ends of the electromagnetic coil 11, and And a bonnet 15 for covering. The first core 13 includes a disk portion 13a and a protruding portion 13b protruding downward from the center thereof, the disk portion 13a covers the upper end portion of the electromagnetic coil 11 in the figure, and the protruding portion 13b extends into the center hole 11a. Inserted and placed. The second core 14 has a substantially annular shape having a center hole 14 a and covers the lower end of the electromagnetic coil 11 in the figure. In this center hole 14a, the vertical movement of the plunger 12 is guided. The plunger 12 has a substantially cylindrical shape, a diaphragm 16 as a valve body of the present invention is fixed to the lower end thereof, and a compression spring 17 is interposed between the plunger 12 and the first core 13 at the upper portion thereof. The diaphragm 16 opens or closes the valve seat 5 by moving up and down together with the plunger 12.
[0016]
Furthermore, a circumferential groove 14b is provided on the outer peripheral surface of the second core 14, and a part of the bonnet 15 is caulked against the circumferential groove 14b. A wave washer 18 is sandwiched between the second core 14 and the electromagnetic coil 11. Here, the distance between the lower end surface 13c of the first core 13 and the bottom surface 14c of the second core 14 is defined as the coil depth H. The distance that the plunger 12 can move in the actuator part A is determined by the coil depth H.
[0017]
Next, the operation of the electromagnetic valve 1 will be described. FIG. 1 shows the electromagnetic valve 1 in a closed state, and the electromagnetic coil 11 is demagnetized. The plunger 12 is pushed downward by the compression spring 17, so that the diaphragm 16 closes the valve seat 5 and the flow path 4 is blocked.
[0018]
Here, when the electromagnetic coil 11 is excited, the plunger 12 is pulled up against the compression spring 17 by the magnetic force generated in the electromagnetic coil 11, the first core 13, and the second core 14, and accordingly, the center of the diaphragm 16. Department is raised. For this reason, the valve seat 5 is opened, and both ports 2 and 3 communicate with each other by the flow path 4.
[0019]
Next, the assembly process of the electromagnetic valve 1 will be described. Here, description of the assembly process of the body B and the mounting process of the actuator part A and the body B will be omitted, and only the assembly process of the actuator part A will be described. 2 to 6 are cross-sectional views showing processes related to the assembly of the actuator part A.
[0020]
First, in the first step shown in FIG. 2, the second core 14 is set on the work table 26. Here, the work base 26 is a jig formed of tool steel, and has a disk-shaped base portion 26a and a columnar protrusion 26b provided at the center thereof. The protrusion 26 b has an outer diameter that matches the inner diameter of the center hole 14 a of the second core 14, and a length that matches the coil depth H.
[0021]
Next, in the second step shown in FIG. 3, the wave washer 18, the coil assembly 21, and the bonnet assembly 20 are sequentially stacked on the work table 26 on which the second core 14 is set. At this time, the lead wire (not shown) of the coil assembly 21 is set so as to come out from the notch 23 of the bonnet assembly 20. FIG. 4 shows a state in which these are superimposed. As shown in FIG. 4, the presence of the wave washer 18 forms a predetermined gap 28 between the protruding portion 13 b of the first core 13 and the protruding portion 26 b of the work table 26.
[0022]
Here, the bonnet assembly 20 and the coil assembly 21 used in the second step are pre-assembled prior to the step. In the bonnet assembly 20, the first core 13 is fixed in the bonnet 15. The adhesive 22 is applied to the upper surface of the first core 13, and the first core 13 is inserted into the hole 15 a at the center of the upper end of the bonnet 15. The tip protruding portion 13d is inserted and bonded. Further, after the tip projecting portion 13d is caulked to the bonnet 15, the surface is painted. A cutout 23 for passing a lead wire (not shown) of the coil assembly 21 is provided at a part of the bottom of the bonnet 15. The coil assembly 21 forms a coil 24 by winding a coil winding 24a around a coil bobbin 24b, and further forms a mold 25 by covering them with PBT resin.
[0023]
Next, in the third step shown in FIG. 5, the bonnet assembly 20 is pressed against the work table 26 by the pressing jig 29, so that the skirt of the bonnet 15 is fitted to the outer periphery of the second core 14. contacting one another collision detecting portion 26b of the collision detecting portion 13b and the work table 26 of the first core 13 by deforming the wave washer 18. By doing so, the distance between the lower end surface 13c of the first core 13 and the bottom surface 14c of the second core 14 is made equal to the protruding portion 26b of the work base 26, and the coil depth H is determined by this distance. To do.
[0024]
Thereafter, in the fourth step shown in FIG. 6, the outer periphery of the bottom of the bonnet 15 is compressed by the caulking ring 30 while the bonnet 15 is pressed from above by the holding jig 29. Thereby, a part of the outer periphery of the skirt 15 is caulked against the circumferential groove 14 b of the second core 14. This caulking strength corresponds to such a magnitude that the pulling force of the second core 14 against the bonnet 15 is 1157 N (118 kgf) or more.
[0025]
FIG. 7 shows the caulking portion in an enlarged manner. The caulking ring 30 is provided with a caulking protrusion 30 a at a position corresponding to the circumferential groove 14 b of the second core 14. By pressing the protrusion 30 a against the second core 14, a part of the skirt portion of the bonnet 15 is caulked so as to penetrate the circumferential groove 14 b along the outer periphery of the second core 14. In this way, the actuator part A is assembled.
[0026]
As described above, in the solenoid valve 1 of this embodiment, the plunger 12 guided by the guide hole 14 a of the second core 14 is reciprocated toward the lower end surface 13 c of the first core 13. It has become. For this reason, the movement distance of the plunger 12 is determined by the distance between the first core 13 and the second core 14, that is, the coil depth H. Moreover, since the valve seat 5 is opened and closed by the diaphragm 16 fixed to the lower end of the plunger 12, the moving distance of the plunger 12 affects the opening degree and responsiveness as the electromagnetic valve 1.
Here, since the 1st core 13 is accommodated in the bonnet 15 and it fixes to the inner upper end part, the 1st core 13 will be correctly positioned by the bonnet 15. FIG. Accordingly, the coil depth H is ultimately determined by the positional relationship between the second core 14 and the bonnet 15.
[0027]
In this embodiment, in order to position the second core 14 on the bonnet 15, the second core 14 is fitted inside the opening of the bottom of the bonnet 15, and the bonnet 15 is inserted into the circumferential groove 14 b of the core 14. It is only necessary to caulk a part of the hem. Accordingly, the second core 14 is mechanically accurately positioned with respect to the bonnet 15. For this reason, it is possible to relatively easily ensure sufficient pulling strength of the second core 14 with respect to the bonnet 15. In addition, by appropriately setting the depth of the circumferential groove 14b and the caulking strength of the bonnet 15, the amount of caulking of the bonnet 15 can be easily managed. Therefore, it is possible to easily adjust the coil depth H with the second core 14 with high accuracy.
[0028]
In other words, in each of the conventional solenoid valves, the second core is fixed to the bonnet by adhesive, R caulking, or screw tightening. However, it has been difficult to achieve both the securing of the pull-out strength of the second core and the ease of securing the adjustment accuracy of the coil depth H. On the other hand, according to the solenoid valve 1 of the present embodiment, by adopting the above-described caulking method, it is possible to relatively easily ensure sufficient pulling strength of the second core 14 with respect to the bonnet 15, In addition, the highly accurate adjustment of the coil depth H can be easily performed. From this, the superiority of the solenoid valve 1 of the present embodiment over the conventional solenoid valve is clear.
[0029]
In this embodiment, in the assembly process of the electromagnetic valve 1, the bonnet 15 is mounted on the work base by the presser jig 29 with the first core 13, the coil assembly 21, and the second core 14 set in the bonnet 15. 26. Therefore, the coil depth H can be accurately adjusted only by mechanically matching the distance from the lower end surface 13c of the first core 13 to the bottom surface 14c of the second core 14 to the length of the protruding portion 26b of the work base 26. Can get to. Further, since the bonnet 15 is caulked to the circumferential groove 14b of the second core 14 with the coil depth H accurately adjusted, the coil depth H may be shifted during or after the caulking process. Absent.
[0030]
In addition, this invention is not limited to the said embodiment, In the range which does not deviate from the meaning of invention, it can also implement as follows.
[0031]
In the embodiment, as shown in FIG. 8A, the circumferential groove 14b formed on the outer periphery of the second core 14 has a quadrangular cross section. However, as shown in FIG. The circumferential groove 31 may be used.
[0032]
【The invention's effect】
As described above, according to the first aspect of the present invention, the second core is fitted inside the opening of the bonnet, and the bonnet is caulked in the circumferential groove of the second core. For this reason, the highly accurate adjustment of the coil depth by the core can be easily achieved, and the effect that the removal strength of the core with respect to the bonnet can be ensured relatively easily is exhibited.
[Brief description of the drawings]
FIG. 1 is a cross-sectional view showing a solenoid valve according to one embodiment.
FIG. 2 is a cross-sectional view showing an assembling process of the actuator portion in the same manner.
FIG. 3 is a cross-sectional view showing an assembly process in the same manner.
FIG. 4 is a sectional view similarly showing an assembly process.
FIG. 5 is a cross-sectional view showing an assembly process in the same manner.
FIG. 6 is a cross-sectional view showing an assembly process in the same manner.
FIG. 7 is an enlarged cross-sectional view of a caulking portion.
8A is a cross-sectional view showing a circumferential groove according to an embodiment, and FIG. 8B is a cross-sectional view showing another circumferential groove.
FIG. 9 is a cross-sectional view showing a conventional solenoid valve.
[Explanation of symbols]
DESCRIPTION OF SYMBOLS 1 Electromagnetic valve 5 Valve seat 11 Electromagnetic coil 11a Center hole 12 Plunger 13 1st core 14 2nd core 14a Guide hole 14b Circumferential groove 15 Bonnet 16 Diaphragm (valve body)
B Body H Coil depth

Claims (1)

An electromagnetic coil, a first core disposed at one end of the central hole of the electromagnetic coil, and a plunger reciprocated toward the end surface of the first core at the other end of the central hole of the electromagnetic coil; The second core is disposed at the other end of the central hole of the electromagnetic coil and has a guide hole for guiding the movement of the plunger, a valve body provided on the plunger, and opened and closed by the valve body A body including a valve seat, and a bonnet for housing the electromagnetic coil, the first core, and the plunger, and housing the electromagnetic coil, the first core, and the plunger in the bonnet; by fixing the second core into the opening inside the hood, the assembling method of the electromagnetic valve so as to set the coil depth between the first core and the second core to a predetermined value Stomach,
A first step of inserting the second core into a work table jig having a protrusion having the same height as the coil depth;
A coil washer, a wave washer, a bonnet assembly in which the first core is fixed inside the bonnet in advance, and a coil assembly in which a coil winding is wound around a coil bobbin and molded with a resin. A second step of overlapping so that is inserted into the bonnet assembly;
By pressing the bonnet assembly against the work table jig with a holding jig, the bottom of the bonnet is fitted to the outer periphery of the second core, and the first core and the work table jig protrude. A third step of bringing the parts into contact with each other;
In a state where the bonnet assembly is pressed by the pressing jig, the outer periphery of the bottom of the bonnet is compressed by a caulking jig, and the bonnet is caulked in a circumferential groove formed on the outer periphery of the second core. 4 steps,
For assembling a solenoid valve.

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