JPH0124460Y2 - - Google Patents

Description

[Detailed Description of the Invention] This invention relates to a solenoid valve, and particularly to a structure of a solenoid valve that is excellent in durability and airtightness.

In general, in a solenoid valve, the valve body (integrated with a biasing means such as a spring) that is crimped against the valve seat is moved away from the valve seat and moved toward the fixed core, and then again by turning on and off the excitation current of the coil. The flow rate is controlled by pressing the valve body against the valve seat.However, in conventional solenoid valves, the valve seat was shaped like a spherical sheet, which caused considerable stress when the valve body pressed against the valve seat. acts on the spherical surface of the valve seat, which tends to cause deformation at that point, which deteriorates durability and airtightness in a short period of time, shortening the lifespan of the valve as a flow control function. Also, in the 1970s.
In the valve seat disclosed in Publication No. 156825, a connected ring-shaped outer periphery that does not protrude from the inner periphery is formed on the outside of the connected ring-shaped inner periphery, so when the valve is pressed, the outer periphery A problem arises in that a sealing groove is formed between the part and the inner circumferential part, and this becomes a suction cup, which causes the valve seat to stick to the valve body, making it difficult for the valve body to separate. It was hot.

This invention was made to solve the above-mentioned problems of conventional solenoid valves, and even when a considerable amount of stress is applied to the valve seat by crimping the valve body, the stress can be dispersed. It is an object of the present invention to provide a solenoid valve with excellent durability and airtightness that allows the valve body to easily move away from the valve seat.

For this reason, the solenoid valve of this invention is provided with an annular central lip protruding from the valve body around the fluid hole of the valve seat, and at least one radial relief on the outer peripheral side of the central lip. The external lip has a groove and does not protrude further toward the valve body than the central lip. With this configuration, the stress applied to the central lip when the valve body presses against the valve seat is dispersed. Furthermore, the valve is characterized in that it has good airtightness and also that the valve element can be moved away from the valve seat smoothly.

Hereinafter, a solenoid valve according to an embodiment of the invention will be described in more detail with reference to the drawings.

This electromagnetic valve shown in FIG. 1 mainly includes a supply pipe 2 and a discharge pipe 3 provided in a flow path housing 1, a valve seat 4 made of an elastic body fitted to the lower end of the supply pipe 2 in FIG. a valve body 6 that is pressed against the valve seat 4 by the action of a leaf spring 5; a movable iron piece 8 that is integrally provided with the valve body 6 via the leaf spring 5 and a connecting member 7;
An electromagnetic solenoid 9 that attracts the movable iron piece 8, and a fluid passage 1 that houses and fixes the electromagnetic solenoid 9 and is integrated with the passage housing 1 via bolts 10 and the like.
1 is composed of an electromagnetic solenoid case 12 and the like.

In this case, both left and right ends of the leaf spring 5 in FIG. 1 are fixed between the flow path housing 1 and the electromagnetic solenoid case 12. Movable iron piece 8
A thin elastic member 13 is baked onto the portion where the electromagnetic solenoid 9 is bonded. The electromagnetic solenoid 9 mainly includes a fixed iron core 9a, a coil 9b wound around the fixed iron core 9a, and the like, and is fixed in the electromagnetic solenoid case 12 with a filler or the like.

Therefore, the valve seat 4 will be explained based on FIGS. 2a and 2b. FIG. 2a is an enlarged sectional view of the valve seat 4 shown in FIG. 1, and FIG. 2b is a front view thereof.

As shown in the figure, the valve seat 4 is provided with a fluid hole, in this case a fluid suction hole 4a, approximately at the center.

Around the suction hole 4a, an annular central lip 4b is provided at the lower end in FIG. 2a, facing the valve body 6 and projecting toward the valve body 6. A substantially annular external lip 4d that does not protrude further toward the valve body 6 than the central lip 4b is provided on the outer circumference side of the valve body 4c. It has three escape grooves 4e cut out in the radial direction.

The operation of the electromagnetic valve according to one embodiment of the invention having the above structure will be explained next.

When the excitation current of the coil 9b is turned off, the valve body 6 is pressed against the valve seat 4 by the action of the leaf spring 5, thereby blocking the flow of fluid. At this time, the stress acting on the central lip 4b due to the compression of the valve body 6 is dispersed by the external lip 4d, and moreover, the airtightness with the valve body 6 is extremely improved.

When the excitation current of the coil 9b is turned on, the movable iron piece 8 is attracted to the fixed iron core 9a against the force of the leaf spring 5 due to the magnetic field generated in the electromagnetic solenoid 9. At this time, the valve body 6 also moves downward in FIG. 1 together with the movable iron piece 8 and is separated from the valve seat 4, and the fluid flows into the fluid passage 11 from the suction hole 4a and is discharged into the discharge pipe 3. At this time, since the outer lip 4d is formed with a radial relief groove 4e, when the valve body 6 is in contact with the center lip 4b and the outer lip 4d, the center lip 4b
Since a sealed annular space is not formed between the external lip 4d and the valve body 6, and therefore no suction cup state occurs, the valve body 6 is smoothly moved away from the valve seat 4. to leave.

When the excitation current of the coil 9b is turned off again, the magnetic field is cut off, the movable iron piece 8 is separated from the fixed iron core 9a by the action of the leaf spring 5, and the valve body 6 is pressed against the valve seat 4 again. At this time, as described above, the external lip 4d disperses the stress acting on the central lip 4b, and also contributes to maintaining good airtightness.

As shown in FIG. 2b, the external lip 4d has three radial relief grooves 4e in this embodiment, but the number of relief grooves 4e may be determined as necessary.

As explained above, according to the solenoid valve of this invention, its structure is such that a central lip facing the valve body is provided around the suction hole of the valve seat, and at least one radial direction is provided on the outer peripheral side of the central lip. Since the valve body has a relief groove and an external lip that does not protrude further toward the valve body than the central lip, various excellent effects can be achieved as described below.

In other words, the conventional problem of stress concentrating on the contact point when the valve body presses against the valve seat, causing deformation at that point, has been completely eliminated, and the valve body now applies considerable stress to the center lip of the valve seat. Even if it works,
Since the external lip disperses the stress, the central lip will not wear out prematurely, resulting in good durability.Even if the central lip deforms, the external lip will maintain good airtightness with the valve body. Therefore, the function as a solenoid valve that controls the flow rate is improved.
Its lifespan has been extended, and since an escape groove is provided when the valve body separates from the central lip and external lip, a sealed space is not formed between the central lip, external lip, and the valve body. easily leaves the valve seat.

[Brief explanation of the drawing]

Fig. 1 is an explanatory partial cross-sectional view schematically showing a solenoid valve according to an embodiment of this invention, Fig. 2a is an explanatory view showing an enlarged view of the valve seat shown in Fig. 1, and Fig. 2b is an explanatory view of the valve seat shown in Fig. 1. It is a front view. 4... Valve seat, 4b... Central lip, 4d... External lip, 4e... Relief groove.

Claims (1)

[Scope of utility model registration request] In a solenoid valve that opens and closes a fluid passage by reciprocating a valve body between a valve seat and a fixed iron core by turning on and off an excitation current, a valve body is provided around a fluid hole of the valve seat facing the valve body. It is characterized by providing an annular central lip that protrudes from the center lip, and an external lip that has at least one radial clearance groove on the outer circumferential side of the central lip and does not protrude further toward the valve body than the central lip. Solenoid valve.