JPH08320084A - Solenoid valve - Google Patents

Abstract

PURPOSE: To prevent contamination in control fluid from invading clearances of the sliding part of a movable iron core and the collision part by shutting the space between clearances which exist between the movable part outer peripheral surface including at least movable iron core and a valve body and the fixed part inner peripheral surface positioned on the outer periphery of the movable part in opening of the valve, and a fluid passage. CONSTITUTION: Since a seal ring 14 is brought in contact with a seat surface 15 of a guide member 9, blocks and seals a clearance when a fluid passage 1C is released and fluid is made to pass through the fluid passage 1C after a valve 7 is separated from a valve seat 5 in opening of a valve, control fluid which has reached to the fluid passage 1C can be prevented from invading the clearance 12 of a sliding part of a plunger 6 and a clearance 13 of a collision part of the plunger 6 to a locking part 11. Therefore, the possibility that contamination in control fluid invades the clearances 12, 13 of the sliding part and the collision part of the plunger 6 is eliminated, and generation of break and stick of the plunger 6 and the guide member 4 can be prevented.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a solenoid valve, and in particular,
The present invention relates to a seal structure for a sliding part of a movable part and a collision part inside a case of a solenoid valve.

[0002]

2. Description of the Related Art Conventionally, a fixed iron core excited by energization of a solenoid coil, a movable iron core slid in a direction of being attracted to the fixed iron core by excitation of the fixed iron core, and the movable iron core operate integrally. Some include a valve portion, a valve seat that is in pressure contact with the valve portion to close the fluid passage when the valve is closed, and a spring that normally elastically biases the valve portion in the valve closing direction (special feature). See Kaihei 6-074357).

FIG. 11 shows an example of such a conventional solenoid valve, in which a solenoid coil 3 is wound around a bobbin 2 built in a case 1. This bobbin 2 has
The fixed iron core 4 is built in. The case 1 is provided with an inlet 1A for a control fluid such as oil, an outlet 1B, and a fluid passage 1C communicating with the inlet 1A and the outlet 1B. The fluid passage 1C is provided with a valve seat 5 as a valve seat. Has been.

Further, the bobbin 2 has a built-in plunger 6 as a movable iron core which is freely slidable in the axial direction, and a tip end portion of the plunger 6 has a tip end portion having a valve portion 7.
The poppet 8 is connected. A cylindrical guide member 9 is arranged on the outer peripheral portion of the plunger 6 so that the plunger 6 can slide smoothly. The plunger 6
Is supported by a fixed iron core 4 via a spring 10 that elastically biases the valve portion 7 at the tip of the poppet 8 against the valve seat 5, and the plunger 6 is attached to the tip portion of the fixed iron core 4 during the valve opening operation. It is collisionally locked to the locking portion 11 provided.

[0005]

However, the conventional solenoid valve as described above has the following problems. That is, the plunger 6 is provided slidably along the inner peripheral surface of the guide member 9, and a predetermined clearance 1 is provided at the sliding portion between the outer peripheral surface of the plunger 6 and the inner peripheral surface of the guide member 9.
2 is formed, and this clearance 12 communicates with the fluid passage 1C.

For this reason, the control fluid reaching the fluid passage 1C enters the clearance 12 of the sliding portion of the plunger 6, and from this clearance 12 to the clearance 13 of the collision portion between the plunger 6 and the locking portion 11. invade. Therefore, contamination (impurities and foreign substances) in the control fluid
Is the clearance 1 of the sliding part and the collision part of the plunger 6.
There is a risk that the plunger 6, the guide member 9 and the locking portion 11 may be damaged or stick, etc.

In view of the conventional problems as described above, the present invention improves the sealability of the clearance between the movable portion including at least the movable iron core and the valve portion and the fixed portion located on the outer periphery of the movable portion. Thus, it is an object of the present invention to prevent contamination in the control fluid from entering the clearance such as the sliding portion and the collision portion of the movable iron core.

[0008]

For this reason, the invention according to claim 1 has a case having a fluid inlet and an outlet, a fluid passage communicating the inlet and the outlet, and a bobbin built in the case. A solenoid coil wound around the bobbin,
A fixed iron core excited by energization of the solenoid coil, a movable iron core slid in a direction of being attracted to the fixed iron core by excitation of the fixed iron core, a valve portion operating integrally with the movable iron core, and a valve closing valve. A solenoid valve configured to include a valve seat that is sometimes in pressure contact with a valve portion to close the fluid passage and an elastic member that elastically biases the valve portion in a valve closing direction at least when the valve is opened. A seal means is provided to shut off the clearance between the fluid passage and the clearance between the outer peripheral surface of the movable portion including the movable iron core and the valve portion and the inner peripheral surface of the fixed portion located at the outer peripheral portion of the movable portion.

According to a second aspect of the present invention, the seal means is configured such that a plate-shaped seal ring provided on the outer peripheral surface of the movable portion is brought into contact with a seat surface formed on the fixed portion, and the clearance is fluidized. It was configured to block the passage.

[0010]

In the invention according to claim 1, the sealing means is
When the valve is opened, the valve section separates from the valve seat and the fluid passage is opened,
When the fluid flows through the fluid passage, the fluid passage and the clearance are blocked, so that the control fluid reaching the fluid passage is prevented from entering the clearance of the sliding portion of the movable iron core.

In the invention according to claim 2, when the valve is opened, the valve portion is separated from the valve seat to open the fluid passage, and when the fluid flows through the fluid passage, the seal ring contacts the seat surface of the fixed portion. Therefore, the impact at the time of collision between the movable core and the locking member that restricts the final movement of the movable core is mitigated, and the collision noise is mitigated.

[0012]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS The present invention will be described in detail below with reference to the accompanying drawings. FIG. 1 is a sectional view showing an embodiment of the invention according to claim 1. In this figure, the same elements as those in FIG. 11 are designated by the same reference numerals to simplify the description. In the figure,
A solenoid coil 3 is wound around a bobbin 2 built in the case 1, a fixed iron core 4 is built in the bobbin 2, and the case 1 has an inlet 1A, an outlet 1B, and a fluid passage 1C for a control fluid such as oil. And the valve seat 5 is provided in the fluid passage 1C as in the conventional case. Also, bobbin 2
Inside, a plunger 6 in which a poppet 8 having a valve portion 7 at its tip is connected is built in, and the configuration including a guide member 9 and a spring 10 is the same as the conventional one.

The difference from the prior art is that the plunger 6 is opened when the valve is opened.
The clearance 12 between the outer peripheral surface of the movable portion including the poppet 8 and the valve portion 7 and the inner peripheral surface of the guide member 9 as the fixed portion located at the outer peripheral portion of the movable portion is blocked from the fluid passage 1C. The point is that a sealing means is provided. In the embodiment shown in FIG. 1, the sealing means is a plate-shaped seal ring 14 mounted on the outer peripheral surface of the poppet 8 in the movable portion in the vicinity of the valve portion 7.
Are brought into contact with the seat surface 15 formed on the guide member 9 serving as the fixed portion, and the clearance 12 is fixed to the fluid passage 1
It is a configuration to cut off from C.

The seal ring 14 contacts the seat surface 15 of the guide member 9 and closes the clearance 12 when the valve portion 7 is separated from the valve seat 5 and the fluid passage 1C is opened when the valve is opened. It is provided so as to be separated from the seat surface 15 of the guide member 9 when the valve portion 7 is brought into pressure contact with the valve seat 5 to close the fluid passage 1C at the time of sealing and closing the valve.

According to this structure, the seal ring 14
When the valve is opened, the valve portion 7 separates from the valve seat 5 to open the fluid passage 1C, and when the fluid flows through the fluid passage 1C, it abuts the seat surface 15 of the guide member 9 to close the clearance 12. Therefore, the control fluid reaching the fluid passage 1C receives the clearance 12 of the sliding portion of the plunger 6
In addition, it is possible to prevent entry into the clearance 13 of the collision portion between the plunger 6 and the locking portion 11.

Therefore, the risk of contamination (impurities and foreign matters) in the control fluid being caught in the clearances 12 and 13 of the sliding portion and the collision portion of the plunger 6, is eliminated, and the plunger 6 and the guide member 4 are damaged and stick. Can be prevented. Further, the provision of such a seal ring 14 has the following advantages.

That is, a suction preventing spacer is interposed between the plunger 6 and the guide member 9 in order to soften the impact at the time of collision between them and to reduce the collision noise. 7 is separated from the valve seat 5, the fluid passage 1C is opened, and when the fluid flows through the fluid passage 1C, the seal ring 14 contacts the seat surface 15 of the guide member 9, so that the plunger 6 and the guide member 9 Since the impact at the time of collision can be mitigated and the collision noise can be mitigated, it is not necessary to provide the suction preventing spacer as described above.

Further, since the seal ring 14 seals at the portion where the flow velocity of the control fluid is high on the tip end side of the guide member 9, a large self-cleaning action by the flushing of the control fluid can be obtained. Next, examples in which the sealing means according to the present invention is applied to various solenoid valves will be described based on FIGS. 2 to 10.

The solenoid valve of FIG. 2 is a three-way duty valve, and as shown in FIG. 2B, a plate-shaped seal ring B is formed on the outer peripheral surface of the movable portion A including at least the movable iron core and the valve portion. When the valve is opened, the seal ring B contacts the end surface of the bobbin C serving as the fixed portion, and blocks the clearance D between the outer peripheral surface of the movable portion A and the inner peripheral surface of the bobbin B from the fluid passage E. . Also, in this 3-way duty valve,
As shown in FIG. 3C, a spring locking portion F formed so as to project from the outer peripheral surface of the movable portion A is extended outward to form a plate-shaped seal ring. It may be configured to contact the end surface of the stopper H fitted and attached to the inner peripheral surface to block the clearance D and the fluid passage E.

The solenoid valve shown in FIG. 3 is a two-way duty valve, and a seal ring B is attached to the outer peripheral surface of the movable portion A including at least the movable iron core and the valve portion, and the seal ring B is inside the case G when the valve is opened. It is configured to abut on the end surface of the ring member I mounted on the peripheral surface and to block the clearance D between the outer peripheral surface of the movable portion A and the inner peripheral surface of the bobbin C from the fluid passage E.
In the solenoid valve of FIG. 4, the seal ring B is attached to the outer peripheral surface of the movable portion A including at least the movable iron core and the valve portion, and when the valve is opened, the seal ring B contacts the end surface of the bobbin C,
The clearance D between the outer peripheral surface of the movable portion A and the inner peripheral surface of the bobbin B is cut off from the fluid passage E.

In the solenoid valve of FIG. 5, the seal ring B is mounted on the outer peripheral surface of the movable portion A including at least the movable iron core and the valve portion, and the seal ring B is provided on the inner peripheral surface of the bobbin C when the valve is opened. It is configured to come into contact with the stopper H to block the clearance D between the outer peripheral surface of the movable portion A and the inner peripheral surface of the bobbin C from the fluid passage E. In the solenoid valve of FIG.
A seal ring B is formed on the outer peripheral surface of the movable portion A including at least the movable iron core and the valve portion, and the seal ring B is formed when the valve is opened.
Is brought into contact with a stepped seat portion c formed at an end portion of the bobbin C as shown in FIG. 7A or a substantially intermediate portion in the axial direction as shown in FIG. The clearance D between the surface and the inner peripheral surface of the bobbin B is blocked from the fluid passage E.

In the solenoid valves of FIGS. 7 to 10, a seal ring B is attached to the outer peripheral surface of the valve portion a in the movable portion A including at least the movable iron core and the valve portion, and the seal ring B is opened when the valve is opened. It is configured to abut on the tip end surface of the fixed portion C on the outer peripheral side of the portion to block the clearance D between the outer peripheral surface of the valve portion a and the inner peripheral surface of the fixed portion C from the fluid passage E.

[0023]

As described above, according to the first aspect of the invention, in the solenoid valve, when the valve is opened, the movable portion outer peripheral surface including at least the movable iron core and the valve portion and the outer peripheral portion of the movable portion are positioned. Since the sealing means for blocking the clearance between the inner surface of the fixed part and the fluid passage is provided, contamination (impurities and foreign matters) in the control fluid is caught in the clearance of the sliding part and the collision part. The fear of being eliminated,
It is possible to prevent damage to members such as the movable iron core and occurrence of sticking.

According to the second aspect of the invention, when the valve is opened, the valve portion is separated from the valve seat to open the fluid passage, and when the fluid flows through the fluid passage, the seal ring is attached to the seat surface of the fixed portion. Since they abut, the impact at the time of collision between the movable iron core and the locking member that restricts the final movement of the movable iron core is mitigated, and the impact noise can be mitigated.

[Brief description of drawings]

FIG. 1 is a sectional view of an embodiment of the invention according to claims 1 and 2.

FIG. 2 is a view showing another embodiment, (A) is a sectional view,
(B) is an enlarged view of the (A) middle X arrow, and (C) is an enlarged view of the (A) middle Y arrow.

3A and 3B are views showing still another embodiment, in which FIG. 3A is a sectional view, and FIG. 3B is an enlarged view taken in the direction of arrow X in FIG. 3A.

4A and 4B are views showing still another embodiment, in which FIG. 4A is a sectional view, and FIG.

FIG. 5 is a sectional view showing still another embodiment.

6A and 6B are views showing still another embodiment, in which FIG. 6A is a cross-sectional view, and FIGS. 6B and 6C are enlarged views taken along arrow X in FIG. 6A.

FIG. 7 is a sectional view showing still another embodiment.

FIG. 8 is a sectional view showing still another embodiment.

FIG. 9 is a sectional view showing still another embodiment.

FIG. 10 is a sectional view showing still another embodiment.

FIG. 11 is a sectional view showing a conventional solenoid valve.

[Explanation of symbols]

 1 case 1A inlet 1B outlet 1C fluid passage 2 bobbin 3 solenoid coil 4 fixed iron core 5 valve seat 6 plunger 7 valve part 9 guide member 10 spring 14 seal ring 15 seat surface

Claims (2)

[Claims] 1. A case having a fluid inlet and an outlet and a fluid passage communicating with the inlet and the outlet, a bobbin contained in the case, a solenoid coil wound around the bobbin, and the solenoid coil. A fixed iron core excited by energization of the movable iron core, a movable iron core that is slid in a direction to be attracted to the fixed iron core by excitation of the fixed iron core, a valve portion that operates integrally with the movable iron core, and a valve portion when the valve is closed. A solenoid valve configured to include a valve seat that presses against the fluid passage to close the fluid passage, and an elastic member that normally elastically biases the valve portion in a valve closing direction. An electromagnetic valve, comprising: a seal means for shutting off a clearance between a fluid passage and a clearance between an outer peripheral surface of a movable portion including a valve portion and an inner peripheral surface of a fixed portion located at an outer peripheral portion of the movable portion. 2. The sealing means has a structure in which a plate-shaped seal ring provided on an outer peripheral surface of the movable portion is brought into contact with a seat surface formed on the fixed portion to block the clearance from a fluid passage. The solenoid valve according to claim 1, wherein the solenoid valve is provided.