JPS6347327Y2 - - Google Patents

Description

[Detailed explanation of the idea] The present invention relates to a solenoid valve.

In conventional solenoid valves, an excitation coil is attached to the outside of a guide pipe that houses a fixed iron core and a movable iron core, and this coil is fixed to the guide pipe with screws or other means. The above-mentioned fixing means using screws and the like has the disadvantage that there are many parts and many parts to be machined, and the workability of assembly is poor, and there is a risk that the coil may come off from the guide pipe due to loosening of the screws or the like.

The present invention makes it possible to assemble or remove the excitation coil from the iron core with a simple operation by simply making some improvements to the members included in the solenoid part of the solenoid valve, and also to ensure that the assembled state is maintained. The present invention provides a solenoid valve that can be maintained at

In order to achieve this object, the solenoid valve of the present invention has a fixed iron core fitted and fixed inside a guide pipe fixed to the valve body, and a movable iron core slidably inserted and fitted to form an iron core part. A spring is interposed between the outer side of the iron core and the valve body, and an excitation coil is slidably inserted in the axial direction, and a cap is fitted to the tip of the iron core to prevent the coil from being removed. It is constructed by attaching and fixing. The above cap is
A spring piece is provided with a protrusion that engages with a recess formed in the iron core, and the length of the spring piece is adjusted so that the tip of the spring piece is inserted into the notch of the coil that is returned to its original position by the biasing force of the spring. As well as preventing the spread of
The length is such that when the coil is displaced in the axial direction against the biasing force of the spring, it comes out of the notch. Therefore, when the excitation coil is inserted outside the iron core and displaced against the biasing force of the spring, the inward protrusion of the spring piece of the cap fitted on the tip of the iron core moves into the recess of the iron core. At the same time, the tip of the spring piece can be inserted into a notch in the coil to prevent it from spreading, thereby ensuring that the coil is held against the iron core. This is a characteristic feature.

Hereinafter, embodiments of the present invention will be described in detail based on the drawings. In FIGS. 1 and 2, 1 is a valve body, 2 is a solenoid part that opens and closes the valve seat 3, and the solenoid part 2 is A fixed core 6 is fitted and fixed inside a guide pipe 5 fixed on the valve body 1, and a movable core 7 is slidably inserted into the core 4. the excitation coil 9 which is slidably inserted in the axial direction with the spring 8 interposed between the spring 8 and the valve body 1 on the outside of the iron core 4, and the coil 9 to prevent it from being removed. The cap 10 is fitted and fixed to the tip of the iron core 4.

The cylindrical guide pipe 5 in the iron core part 4 is
A fixed iron core 6 is fitted and fixed in an exposed state by means such as brazing into the opening at the tip, and a movable iron core 7 equipped with a valve body 11 for opening and closing the valve seat 3 inside thereof can be slid in the axial direction. The valve body 11 is inserted into the valve body 11 by the biasing force of the spring 12 compressed between them.
is biased toward the valve seat 3. Further, a circumferential groove-like recess 6a for locking the cap 10 is formed on the outer periphery of the upper end of the fixed iron core 6.

The excitation coil 9 is configured to attract the movable core 7 to the fixed core 6 against the biasing force of the spring 12 when energized, thereby opening the valve seat 3. A hole 17 into which the iron core 4 is inserted is formed in the center of the bobbin 16, and a hole 17 in the bobbin 16 is formed in the top plate 18a of the frame 18 that covers the outside of the coil 9, as shown in FIG. A through hole 18b communicating with the cap 17 is bored, and a notch 18c, 1 is inserted into a part of the through hole 18b to prevent it from expanding outward.
8c is cut out.

As shown in FIGS. 2 and 4, the cap 10 includes a cap body 20 in the shape of a lidded and bottomless container, and slits 20 are formed at opposing positions on the circumferential side of the cap body 20.
a, 20a are cut to form a pair of elongated spring pieces 20b, 20b that spread outward, and each spring piece 20b is
A protrusion 20c is provided at the base of the cap body 20 to protrude inward and engage with the recess 6a of the fixed iron core 6, and at a position twisted by 90 degrees with the protrusion 20c, a coil is protruded outward from the cap body 20. 9 frame 18
A pair of locking protrusions 20d, 20d that lock on the top surface of
It has a convex design. Note that since the lower end of the cap body 20 also comes into contact with the frame 18, the above-mentioned locking protrusion 20d
is not necessarily necessary.

To assemble the solenoid valve using the above members as shown in FIG. 1, as shown in FIG.
By displacing the spring downwardly against the biasing force of the cap until the spring is fully compressed, the tip of the fixed core 6 is exposed to a large extent, and in this state, the spring of the cap 10 fitted to the fixed core 6 is piece 20
While pressing the coils 9 and 20b inward as shown by chain lines in the figure, the coil 9 can be moved upwardly and returned to its original position by the biasing force of the spring 8. As a result, the spring pieces 20
The tips of b, 20b are the notches 18c, 1 of the frame 18.
8c and is prevented from expanding outward, thereby ensuring that the protrusions 20c, 20c on the spring piece 20b of the cap 10 are firmly engaged with the recess 6a of the fixed core 6, and the cap 10 is inserted into the fixed core 6. Securely fitted and fixed. In parallel with this, the coil 9 further moves upward due to the biasing force of the spring 8, but this upward movement occurs when the upper surface of the top plate portion 18a of the frame body 18 is engaged with the lower edge of the cap 10 in the fixed state or Projection 20
It stops when it collides with d and 20d (see Fig. 1), thereby completing the assembly.

Moreover, in order to disassemble the above-mentioned solenoid valve, it is sufficient to perform an operation completely opposite to the above. That is, the coil 9 is
When the cap 10 is moved downward against the biasing force of the spring 8 from the position shown in the figure to the position shown in FIG. In order to open outward as shown by the solid line in FIG. 2, the spring pieces 20b,
The engagement between the protrusions 20c, 20c of 20b and the recess 6a of the fixed core 6 is released, and the cap 10 and coil 9 can be sequentially extracted from the core 4.

FIG. 5 shows another embodiment of the present invention, in which a covered cylinder is used as the guide pipe 31, and a fixed iron core 32 having a circumferential groove 32a for caulking is housed inside the guide pipe. By caulking 31, a recess 3 for locking the cap is formed in the guide pipe 31.
2 is formed and integrated, and the spring 35 and the coil 36 are sequentially inserted into the thus configured iron core 30 in substantially the same manner as in the previous embodiment, and then the cap 37 is fitted. It is fixed.

In this way, the solenoid valve of the present invention is constructed by making some improvements to the components included in the solenoid section, which not only prevents an increase in the number of parts, but also makes it easier to manufacture the cap using sheet metal processing. In addition, by displacing the coil that is slidably inserted into the core in the axial direction against the biasing force of the spring, the cap for fixing the coil can be attached to and removed from the core. This makes it possible to assemble and disassemble the solenoid valve easily and efficiently.Furthermore, in the assembled state, the tip of the spring piece in the cap can be inserted into the notch in the coil and expanded outward. As a result, the protrusion of the spring piece reliably engages with the recess of the iron core and does not come off, thereby ensuring that the cap is firmly fitted into the iron core, that is, the assembled state as a valve. can be taken as a thing.

[Brief explanation of the drawing]

Fig. 1 is a sectional view of an embodiment of the present invention, Fig. 2 is a sectional view of the coil in a lowered state, Fig. 3 is a plan view of the frame of the coil, and Fig. 4 is a side view of the cap. FIG. 5 is a sectional view of another embodiment of the present invention. 1... Valve body, 4, 30... Iron core part, 5, 31
...Guide pipe, 6,32...Fixed iron core, 6a,
33... recess, 7... movable iron core, 8, 35... spring, 9, 36... excitation coil, 10, 37...
Cap, 18c...Notch, 20b...Spring piece, 20c...Protrusion.

Claims (1)

[Scope of utility model registration request] A fixed iron core is fitted and fixed inside a guide pipe fixed to the valve body, and a movable iron core is slidably inserted and fitted to form an iron core part, and a spring is installed between the outside of the iron core part and the valve body. An excitation coil is inserted so as to be slidable in the axial direction, and a cap for preventing the coil from being removed is fitted and fixed to the tip of the iron core, and the cap is formed in the iron core. A spring piece is provided with a protrusion that engages with the recess, and the length of the spring piece is returned to its original position by the biasing force of the spring.The end of the spring piece is inserted into the notch of the coil to prevent it from spreading outward. The electromagnetic valve is characterized in that the coil is formed in such a length that it comes out of the notch when the coil is displaced in the axial direction against the biasing force of the spring.