JP6791564B2 - solenoid valve - Google Patents

Description

The present invention relates to a solenoid valve having a built-in filter.

Due to the improvement of fuel consumption rate and the tightening of exhaust gas regulations, there is a tendency to shift from gasoline vehicles to clean vehicles with less environmental load. Clean automobiles such as HEVs (Hybrid Electric Vehicles) have a short engine operating time because they perform idle stop, motor drive, and the like. Therefore, in the evaporation gas treatment system using the negative engine pressure in a clean automobile, the treatment timing of the evaporation gas is reduced. In order to increase the amount of transpiration gas processed, it is required to increase the flow rate of the solenoid valve that controls the transpiration gas flow rate.

Since pulsation may become a problem as the flow rate of the solenoid valve increases, the size of the chamber for reducing pulsation is increasing. When the chamber is enlarged, the method of fixing the filter installed in the chamber may become a problem.

For example, in the invention according to Patent Document 1, a filter having a shape along the inner circumference of the chamber is fitted and fixed in a filter storage groove formed on the chamber side.

Japanese Unexamined Patent Publication No. 2009-243550

Since the conventional solenoid valve is configured as described above, there is a problem that when the chamber shape is changed in order to increase the size of the chamber, it is necessary to change the shape of the filter as well.

The present invention has been made to solve the above problems, and an object of the present invention is to share a filter before and after changing the shape of the chamber.

The solenoid valve according to the present invention includes a square chamber having a plurality of ports, a cap for closing the opening of the square chamber, and a filter having a plurality of claws on the outer surface and installed in the square chamber. , A filter fixing wall formed on the side facing the cap in the square chamber and bringing a plurality of claws into contact with the inner wall surface, and a state in which one end is held by the cap and the other end is held by the plurality of claws. It is equipped with a spring that urges the filter.

According to the present invention, since the filter fixing wall is formed in the square chamber, even if the chamber shape is changed to the square chamber in order to increase the size of the chamber, the inner diameter of the filter fixing wall is changed to the chamber before the change. By making it the same as the inner diameter of the chamber, the filter can be shared before and after changing the shape of the chamber. Therefore, even if the chamber shape is changed, it is not necessary to change the shape of the filter, which saves time and cost.

It is a front sectional view which shows the structural example of the solenoid valve which concerns on Embodiment 1. FIG. A configuration example of the square chamber and the filter according to the first embodiment is shown, FIG. 2A is a front sectional view, and FIG. 2B is a bottom view. It is a front view of the filter in Embodiment 1. FIG. 4A and 4B are diagrams illustrating the chamber volume in the first embodiment. 5A is a front sectional view of the cylindrical chamber and the filter, and FIG. 5B is a bottom view, which is a reference example for assisting the understanding of the first embodiment. It is a figure which shows the configuration example of the transpiration gas treatment system of the automobile to which the solenoid valve which concerns on Embodiment 1 is applied.

Embodiment 1.
FIG. 1 is a front sectional view showing a configuration example of the solenoid valve 1 according to the first embodiment. The solenoid valve 1 mainly includes a terminal 2, a coil 3, a core 4, a yoke 5, a plate 6, a spring 7, a plunger 8, a grommet 9, a square chamber 10, and a filter 20.

When the coil 3 is energized via the terminal 2, a magnetic field is generated in the core 4, the yoke 5, and the plate 6, which are magnetic materials, and an electromagnetic force is generated. An electromagnetic force larger than the valve closing force caused by the urging force of the spring 7 acts as a valve opening force, so that the plunger 8 is attracted to the core 4 and separated from the valve seat 15. As a result, the ports 11 and 12 are communicated with each other. The fluid flows in the order of port 11, square chamber 10, filter 20, valve seat 15, and port 12.

When the coil 3 is de-energized, the plunger 8 pushed by the spring 7 comes into contact with the valve seat 15 and the ports 11 and 12 are cut off. The solenoid valve 1 in FIG. 1 is in a closed state. The mechanism for opening and closing the solenoid valve 1 may use a well-known technique, and is not limited to the configuration example shown in FIG.

In the following, the moving direction of the plunger 8 is the vertical direction, the valve opening side is up, and the valve closing side is down. Further, the direction in which the ports 11 and 12 extend is the left-right direction, the port 11 side is the right, and the port 12 side is the left.

The square chamber 10 has a substantially rectangular parallelepiped shape, and a valve seat 15 or the like is formed on the upper portion, and ports 11 and 12 are formed on the side surfaces. Further, an opening 13 is formed in the lower portion of the square chamber 10, and the opening 13 is closed by the cap 14. A substantially cylindrical filter fixing wall 16 for fixing the filter 20 is formed on the valve seat 15 side of the square chamber 10 facing the cap 14.

FIG. 2 shows a configuration example of the square chamber 10 and the filter 20 according to the first embodiment, FIG. 2A is a front sectional view, and FIG. 2B is a bottom view. The cap 14 is not shown in FIG. 2B. The filter 20 is installed in the square chamber 10 and filters the fluid flowing in from the port 11. The filter 20 has a substantially cylindrical shape, and a plurality of claw portions 21 to 24 are formed on the outer surface. The filter 20 is inserted into the square chamber 10 through the opening 13 and assembled into the filter fixing wall 16. Then, the cap 14 is fixed to the opening 13 with the claws 21 to 24 holding one end side of the spring 17, so that the other end side of the spring 17 is held by the cap 14. A state in which the filter 20 is fixed to the filter fixing wall 16 by the claws 21 to 24 abutting on the inner wall surface of the filter fixing wall 16 and the spring 17 urging the claws 21 to 24 toward the valve seat 15. become. In the first embodiment, the filter 20 is formed with four claws 21 to 24, but the number of claws may be three or more.

When the claws 21 to 24 formed on the outer surface of the filter 20 come into contact with the inner wall surface of the filter fixing wall 16, rattling of the filter 20 in the left-right direction and the front-rear direction is prevented. Further, the filter 20 is held inside the square chamber 10 by the urging force of the spring 17, so that the filter 20 is prevented from rattling in the vertical direction. Further, since the filter fixing wall 16 has a cylindrical shape, the assembling angle is not limited when the filter 20 is assembled to the filter fixing wall 16, so that the assembling property is good, and the filter fixing wall 16 and the filter fixing wall 16 are assembled regardless of the assembling angle of the filter 20. Positioning accuracy is high because there is little rattling with the claws 21 to 24.

FIG. 3 is a front view of the filter 20 according to the first embodiment. The tip portion 16a of the filter fixing wall 16 is preferably flush with the ends 21a and 23a of the claw portions 21 and 23 on the tip portion 16a side of the filter fixing wall 16. Although not shown, it is preferable that the ends 22a, 24a of the claws 22 and 24 on the tip 16a side of the filter fixing wall 16 are also flush with the tip 16a of the filter fixing wall 16.

4A and 4B are diagrams illustrating chamber volumes A and B according to the first embodiment. The filter fixing wall 16A shown in FIG. 4A is sized so that the tip portion 16a and the end portions 21a to 24a of the claw portions 21 to 24 are flush with each other. On the other hand, the filter fixing wall 16B shown in FIG. 4B is sized so that the tip portion 16b protrudes from the end portions 21a to 24a of the claw portions 21 to 24. That is, since the filter fixing wall 16A is lower in height than the filter fixing wall 16B, the filter fixing wall 16A does not obstruct the flow of the fluid flowing into the square chamber 10 from the port 11 as compared with the filter fixing wall 16B. Therefore, the substantial chamber volume A of the square chamber 10A is larger than the substantial chamber volume B of the square chamber 10B, and the effect of reducing pulsation is high. Further, the square chamber 10A has a smaller fluid pressure loss and a smaller flow rate decrease than the square chamber 10B. Therefore, the square chamber 10A has the same external dimensions as the square chamber 10B, but the pulsation can be further reduced and a large flow rate can flow.

5A and 5B are reference examples for assisting the understanding of the first embodiment, FIG. 5A is a front sectional view of the cylindrical chamber 100 and the filter 20, and FIG. 5B is a bottom view. The cylindrical chamber 100 has a substantially cylindrical shape, and a valve seat 15 or the like is formed on the upper portion, and ports 11 and 12 are formed on the side surfaces. Further, an opening 103 is formed in the lower portion of the cylindrical chamber 100, and the opening 103 is closed by the cap 104. The cap 104 is not shown in FIG. 5B. Since the inner diameter of the cylindrical chamber 100 is the same as the inner diameter of the filter fixing wall 16 of the square chamber 10, the filter 20 can be shared by the cylindrical chamber 100 and the square chamber 10. Therefore, in order to reduce the problematic pulsation by increasing the flow rate of the solenoid valve 1, it is necessary to change the shape of the filter 20 when the cylindrical chamber 100 is deformed into the square chamber 10 to increase the chamber volume. Eliminates, no hassle and no cost.

FIG. 6 is a diagram showing a configuration example of a transpiration gas treatment system for an automobile to which the solenoid valve 1 according to the first embodiment is applied. Since gasoline is extremely volatile, the pressure inside the sealed fuel tank 31 becomes high. Therefore, the transpiration gas of the fuel tank 31 is released to the canister 32 provided with the atmospheric communication hole and adsorbed on the activated carbon of the canister 32. After the engine 33 is started, the negative pressure of the intake manifold causes a mixed gas of air and transpiration gas to flow from the canister 32 into the engine 33 and burn. The solenoid valve 1 controls the amount of the mixed gas introduced into the engine 33.

As described above, the solenoid valve 1 according to the first embodiment includes a square chamber 10, a cap 14, a filter 20, a filter fixing wall 16, and a spring 17. The square chamber 10 has a plurality of ports 11 and 12. The cap 14 closes the opening 13 of the square chamber 10. The filter 20 has a plurality of claws 21 to 24 on the outer surface and is installed in the square chamber 10. The filter fixing wall 16 is formed on the side of the square chamber 10 facing the cap 14, and a plurality of claw portions 21 to 24 are brought into contact with the inner wall surface. The spring 17 urges the filter 20 in a state where one end side is held by the cap 14 and the other end side is held by the plurality of claw portions 21 to 24. Even if the chamber shape is changed from the cylindrical chamber 100 to the square chamber 10 in order to increase the size of the chamber, the inner diameter of the filter fixing wall 16 is made the same as the inner diameter of the cylindrical chamber 100 before the change, so that the filter 20 is used. Can be shared. Therefore, it is not necessary to change the shape of the filter 20, and no labor and cost are required.

Further, in the first embodiment, the tip portion 16a of the filter fixing wall 16 and the end portions 21a to 24a on the tip portion 16a side of the filter fixing wall 16 in the plurality of claw portions 21 to 24 are flush with each other. With this configuration, the decrease in chamber volume due to the filter fixing wall 16 can be minimized, and the pulsation reduction effect can be maintained. Further, since the pressure loss caused by the filter fixing wall 16 is small, the flow rate does not decrease.

Further, in the first embodiment, the filter 20 and the filter fixing wall 16 have a cylindrical shape. With this configuration, the mounting angle of the filter 20 to the filter fixing wall 16 is not limited, so that the assembling property is good.
Although the cylindrical filter 20 is illustrated in the first embodiment, the filter 20 may have a shape other than the cylindrical shape. Further, the filter fixing wall 16 may have a shape corresponding to the shape of the filter 20, and is not limited to a cylindrical shape.

Further, when the solenoid valve 1 according to the first embodiment is used in an automobile vaporization gas treatment system, it is possible to suppress the occurrence of pulsation due to an increase in the flow rate.

It should be noted that, within the scope of the present invention, it is possible to modify any component of the embodiment or omit any component of the embodiment.

1 Solenoid valve, 2 terminals, 3 coils, 4 cores, 5 yokes, 6 plates, 7 springs, 8 plungers, 9 glomets, 10, 10A, 10B square chambers, 11, 12 ports, 13 openings, 14 caps, 15 Valve seat, 16, 16A, 16B filter fixing wall, 16a, 16b tip, 17 spring, 20 filter, 21-24 claws, 21a-24a end, 31 fuel tank, 32 canister, 33 engine, 100 cylindrical chamber , 103 openings, 104 caps, A, B chamber volumes.

Claims (4)

A square chamber with multiple ports and
A cap that closes the opening of the square chamber and
A filter having a plurality of claws on the outer surface and installed in the square chamber,
A filter fixing wall formed on the side of the square chamber facing the cap and bringing the plurality of claws into contact with the inner wall surface.
A solenoid valve including a spring that urges the filter with one end side held by the cap and the other end side held by the plurality of claws. The solenoid valve according to claim 1, wherein the tip end portion of the filter fixing wall and the tip end portion of the plurality of claws on the tip end side of the filter fixing wall are flush with each other. The solenoid valve according to claim 1 or 2, wherein the filter and the filter fixing wall have a cylindrical shape. The solenoid valve according to any one of claims 1 to 3, wherein the solenoid valve is used in an automobile evaporation gas treatment system.

Images