JP7022222B2 - solenoid valve - Google Patents

Description

The present disclosure relates to solenoid valves.

The solenoid valve described in Patent Document 1 is provided with a compression coil spring between the opening edge of the valve hole and the valve body.

JP-A-2017-160983 (Fig. 2)

There is a demand for a solenoid valve that can suppress the increase in size due to the expansion of the valve hole diameter.

The solenoid valve of claim 1 made to solve the above problems is fixed to the body, a body having a valve hole in the middle of an internal flow path through which a fluid passes, a valve body that opens and closes the valve hole, and the body. A solenoid valve having a sleeve that movably supports one end side of the valve body, and the valve body slides on the inner surface of the sleeve to provide a moving direction of the valve body. A sliding portion to be regulated and a spring holding portion for holding a spring sandwiched between the sliding portion and the opening edge of the valve hole are formed below the sliding portion, and the spring holding portion is more than the sliding portion. When the valve body is placed in the fully open position in which the valve body is in the most open state, the upper end of the inner surface of the internal flow path of the body and the lower surface of the spring holding portion are at the same height. Located in .

Side sectional view of the solenoid valve according to the embodiment Side sectional view of solenoid valve (fully open position) (A) Approximate side sectional view of the valve body in the closed position (B) Approximate side sectional view of the valve body in the fully open position Side sectional view of a conventional solenoid valve Side sectional view of the solenoid valve according to the modified example

[First Embodiment]
FIG. 1 shows a cross-sectional view of the solenoid valve 10. The solenoid valve 10 of this embodiment is a so-called pilot type solenoid valve. The solenoid valve 10 has a valve hole 27 provided in the middle of an internal flow path 25 formed in a body 20 made of a metal block through which a fluid passes, and has a valve body 11 that opens and closes the valve hole 27. The valve body 11 is movably supported by a guide sleeve 30 fixed to the body 20.

The body 20 is provided with a fitting hole 23 in which one end of the guide sleeve 30 is accommodated. A guide sleeve 30 that guides the moving direction of the valve body 11 is fitted in the fitting hole 23. Further, the body 20 has a first flow path 21 that opens to the left side, a second flow path 22 that is provided below the first flow path 21 and opens to the right side, and a first flow path 21 and a second flow path. A communication flow path 24 for connecting to the road 22 is provided. The opening on the first flow path 21 side of the communication flow path 24 is the valve hole 27. An opening groove 27M is provided at the opening edge of the valve hole 27. The internal flow path 25 is composed of the first flow path 21, the second flow path 22, and the connecting flow path 24.

The guide sleeve 30 has a cylindrical shape, and a plunger support portion 35 that movably supports the plunger 40 is formed on the upper side, and a valve body support portion that movably supports the valve body 11 described later on the lower side. 31 is formed. Then, at least a part of the valve body support portion 31 is fitted in the fitting hole 23. As shown in FIG. 1, an electromagnetic coil 60 is arranged around the plunger support portion 35 of the guide sleeve 30, and the plunger 40 is configured to be lowered when the electromagnetic coil 60 is energized. ..

The valve body 11 has a sliding portion 12 that slides on the inner peripheral surface 31N of the valve body support portion 31, and a valve seat 14 that can close the valve hole 27. The valve seat 14 is formed to have a larger diameter than the valve hole 27. The sliding portion 12 and the valve seat 14 are in contact with each other by the body portion 15. Since the body portion 15 is formed to have a smaller diameter than the sliding portion 12 and the valve seat 14, the weight of the valve body 11 can be reduced. Further, a screw member 18 connected to the plunger penetrates through the center.

The solenoid valve 10 of the present embodiment is configured to sandwich the compression coil spring 45 between the opening edge of the valve hole 27 and the valve body 11. By the way, as shown in FIG. 4, the conventional solenoid valve 100 has a configuration in which the compression coil spring 450 is sandwiched between the opening edge of the valve hole 270 and the lower end surface of the sliding portion 120. Therefore, as the valve hole diameter increases, the diameter of the sliding portion 120 also increases accordingly. As the diameter of the sliding portion 120 increases, peripheral parts such as the guide sleeve 300 also become larger, and there is a problem that the solenoid valve 100 becomes larger.

Here, the valve body 11 of the solenoid valve 10 of the present embodiment has an annular spring holding portion 13 that projects outward from the sliding portion 12. The compression coil spring 45 is sandwiched between the lower end surface 13K of the spring holding portion 13 and the opening groove 27M. As a result, by changing the amount of protrusion of the spring holding portion 13, it is possible to cope with the increase in the diameter of the valve hole 27, so that it is not necessary to change the diameter of the sliding portion 12, and the diameter of the valve hole 27 is increased. It is possible to suppress the increase in size of the solenoid valve 10 due to the above. Further, if the valve body 11 has the spring holding portion 13 as in the present embodiment, the size of the sliding portion 12 can be made constant, so that peripheral parts such as the guide sleeve 30 can be used. It can be standardized.

Further, as shown in FIG. 1 , above the spring holding portion 13, a constricted portion 13B is formed in which the lower end portion of the sliding portion 12 is constricted inward. As a result, a large area of the upper surface 13J of the spring holding portion 13 is secured before the spring holding portion 13 comes into contact with the guide sleeve 30. Further, the lower portion of the spring holding portion 13 is formed to be slightly larger than the outer shape of the valve seat 14. As a result, the assembling property of the compression coil spring 45 can be improved.

By the way, when the solenoid valve 10 of the present embodiment is energized, the plunger 40 is lowered, the valve seat 14 of the valve body 11 is moved to a closed position where the valve hole 27 is closed (see FIG. 1), and the energization is turned off. The valve body 11 is pushed upward by the compression coil spring 45 and moves to the fully open position (see FIG. 2).

Here, when the solenoid valve 10 of the present embodiment is in the closed position, the spring holding portion 13 (see FIGS. 1 and 3A) arranged at an intermediate position of the first flow path 21 is in a fully open state. Then, the upper surface 13J of the spring holding portion 13 is configured to abut on the lower end surface 31K of the valve body support portion 31 (see FIGS. 2 and 3B). That is, the spring holding portion 13 comes into contact with the guide sleeve 30 so that the valve body 11 can be positioned at the fully open position. In the conventional solenoid valve 100, the upper surface 120J of the sliding portion 120 is placed against the sleeve for positioning, so that the size of the upper surface 120J of the sliding portion 120 needs to be large enough to be positioned. .. Here, in the solenoid valve 10 of the present embodiment, since the upper surface of the spring holding portion 13 can be used for positioning, the degree of freedom in the shape of the upper end of the sliding portion 12 is improved. For example, since the upper surface of the sliding portion 12 does not need to come into contact with the guide sleeve 30, the axial length of the sliding portion 12 can be shortened. As a result, the weight of the sliding portion 12 in the valve body 11 can be reduced.

Further, in the solenoid valve 10 of the present embodiment, an accommodating portion 28 capable of accommodating the spring holding portion 13 is formed between the fitting hole 23 of the body 20 and the lower end surface 31K of the valve body support portion 31 of the guide sleeve 30. ing. Specifically, the opening of the fitting hole 23 on the first flow path 21 side is formed to be the same as or larger than the outer diameter of the spring holding portion 13. The lower end surface 31K of the valve body support portion 31 of the guide sleeve 30 fitted in the fitting hole 23 is located above the first flow path 21 by the same amount as the axial thickness of the spring holding portion 13. The accommodating portion 28 is formed between the lower end surface 31K of the valve body support portion 31 and the first flow path 21.

As a result, in the solenoid valve 10 of the present embodiment, the spring holding portion 13 is accommodated in the accommodating portion 28 when the valve body 11 is in the fully open state. Since the spring holding portion 13 is arranged so as to be flush with or behind the inner peripheral surface 21N of the first flow path 21, the flow is not obstructed by the spring holding portion 13, and the spring holding portion 13 is not obstructed. It is possible to suppress the pressure loss due to the formation of. In addition, "identical, flush" here means not only physically "exactly identical, flush" but also "substantially identical, substantially flush" that can be seen in the same technical common sense. It is a concept that includes.

[Other embodiments]
(1) In the above embodiment, the spring holding portion 13 has an annular shape, but may be composed of a plurality of projecting pieces.

(2) In the above embodiment, the configuration has the accommodating portion 28 accommodating the spring holding portion 13, but the configuration may not include the accommodating portion 28.

(3) In the above embodiment, the spring holding portion 13 is configured to be smaller than the inner diameter of the fitting hole 23, but as shown in FIG. 5, the spring holding portion 13Z is smaller than the inner diameter of the fitting hole 23. May also be configured large.

(4) In the above embodiment, the upper surface 13J of the spring holding portion 13 comes into contact with the lower end surface 31K of the valve body supporting portion 31, so that the valve body 11 is positioned at the fully open position, but the upper surface of the spring holding portion 13 is located. The configuration may be such that the 13J does not abut on the lower end surface 31K. In this case, as in the conventional case, the upper surface 12J of the sliding portion 12 may be configured to abut on the guide sleeve 30.

(5) In the above embodiment, the entire valve body support portion 31 of the guide sleeve 30 is fitted into the fitting hole 23, but only a part of the valve body support portion 31 is fitted in the fitting hole 23. It may be configured to be fitted to.

(6) In the above embodiment, only the valve body support portion 31 of the guide sleeve 30 is fitted into the fitting hole 23, but the plunger support portion 35 may also be fitted. ..

(7) In the above embodiment, the first flow path 21 and the second flow path 22 are formed in parallel, but the shape of the flow path can be changed as appropriate. Further, when the first flow path 21 and the second flow path 22 intersect, the configuration may not have the connecting flow path 24.

10 Solenoid valve 11 Valve body 12 Sliding part 13 Spring holding part 14 Valve seat 20 Body 23 Fitting hole 25 Internal flow path 27 Valve hole 27M Opening groove 28 Accommodation part 30 Guide sleeve 31 Valve body support part 35 Plunger support part 40 Plunger 45 compression coil spring 60 solenoid coil

Claims (4)

A body with a valve hole in the middle of the internal flow path through which the fluid passes,
A valve body that opens and closes the valve hole,
A solenoid valve having a sleeve fixed to the body and movably supporting one end side of the valve body.
The valve body has a spring sandwiched between a sliding portion that slides on the inner surface of the sleeve to regulate the moving direction of the valve body and an opening edge of the valve hole below the sliding portion. A spring holding part is formed to hold the
The spring holding portion projects outward from the sliding portion ,
When the valve body is placed in the fully open position where it is in the most open state, the upper end of the inner surface of the internal flow path of the body and the lower surface of the spring holding portion are located at the same height. valve. The solenoid valve according to claim 1.
The body is formed with a fitting hole into which at least a part of the sleeve is fitted.
The spring holding portion is a solenoid valve smaller than the inner diameter of the fitting hole. The solenoid valve according to claim 1 or 2.
A solenoid valve that abuts on the lower end surface of the sleeve when the valve body is placed in the fully open position, which is the most open state. The solenoid valve according to any one of claims 1 to 3 .
The spring is a solenoid valve that urges the valve body to be arranged in an open position.

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