JPS5923901Y2 - solenoid valve - Google Patents

Description

[Detailed Description of the Invention] The present invention relates to a two-way solenoid valve mainly used in powder blow-off sorters and the like.

This type of two-way solenoid valve is known, for example, from Japanese Patent Application Laid-open No. It is described in No. 53-47026.

The above two-way solenoid valve has a magnetic pipe (iron core) that is magnetized by an excitation coil, a valve seat body (stop plate) made of non-magnetic metal, and a magnetic frame end plate (shoulder plate) made of magnetic metal. by arranging them facing each other through the end plate, the center through hole in the end plate becomes a cylinder-shaped valve chamber, and an annular valve body (valve piece) made of magnetic metal is fitted in the valve chamber so as to be displaceable in the axial direction, An inflow passage leading to the valve chamber is formed in the magnetic pipe, and a plurality of outflow holes are provided around the valve seat body to communicate the valve chamber with an outflow passage (nozzle);
As a result, when the excitation coil is not energized, the supply fluid pressure presses the annular valve body against the valve seat body to close the outflow hole, and when the excitation coil is energized, the annular valve body is magnetized by the electromagnetic attraction force. It is configured to be adsorbed onto the pipe to open the outflow hole of the valve seat body.

However, the two-way solenoid valve with the above configuration adopts a valve structure in which the annular valve body fitted into the center hole of the magnetic frame end plate is brought into contact with and separated from the magnetic tube to open and close the outflow hole of the valve seat body. Therefore, the fluid in the inflow path of the magnetic tube passes through the center hole of the annular valve body, reaches the inside of the annularly arranged outflow hole row in the valve seat body, and from the inside, flows through the outflow holes. flowing into
As a result, it is not possible to secure a sufficient flow rate according to the cross-sectional area of the outflow hole, resulting in poor flow characteristics.Also, when the valve is opened by energizing the excitation coil, the annular valve body is directly attracted to the magnetic pipe. However, the magnetic material constituting the annular valve body and the magnetic tube is selected with priority given to its magnetic properties, and it does not necessarily have wear resistance. It is inevitable that the valve body and magnetic tube will wear out, and in particular when the magnetic tube is worn out, it must be replaced, but replacing the magnetic tube is significantly more expensive than replacing other parts. Therefore, in reality, the solenoid valve itself will be discarded as having reached the end of its lifespan.

The technical problem of the present invention is to obtain a valve structure that can secure a sufficient flow rate according to the cross-sectional area of the through hole in the valve seat body, and that also allows the valve body to be brought into contact with and separated from a member that is easy to replace. be.

In order to solve the above problems, the solenoid valve of the present invention has an excitation coil wound around a bobbin on the outside of a magnetic tube whose inside is a fluid inflow path, and a magnetic frame is placed around the coil to control the solenoid part. A valve part configured and connected to the solenoid part,
2) A valve function is provided to open the outflow passage in the valve box screwed to the magnetic frame, and the valve mechanism is provided with a plurality of through holes in the valve seat body sandwiched between the valve box and the magnetic frame. A valve seat is formed around the inflow passage side of the through hole, and a flapper-shaped annular valve body made of a magnetic material for opening and closing the valve seat is disposed opposite to the valve seat. The magnetic frame is provided with an annular end plate that attracts the valve body to the face facing the valve seat with the valve body separated from the end face of the magnetic tube when the coil is energized, and the end plate allows the fluid in the magnetic tube to pass through the valve seat body. It is configured to have a plurality of through holes arranged around the hole row to allow inflow from the outside of the hole row.

In the electromagnetic valve configured as described above, when the excitation coil is energized, the annular valve body attracts and contacts the end plate of the magnetic frame due to electromagnetic attractive force, thereby causing a part of the fluid supplied to the inflow path of the magnetic tube to passing through the central through hole of the valve body and flowing into the through holes from inside the through hole array of the valve seat body, and the remainder of the fluid supplied to the inflow passage passing through the through hole in the end plate of the magnetic frame; Fluid flows into the through holes from the outside of the row of holes in the valve seat body, and as a result, fluid flows into the through holes in the valve seat body from virtually all directions around the holes, greatly improving the flow characteristics. Ru.

In addition, even in the open state, the annular valve body does not come into direct contact with the end surface of the magnetic tube, but instead comes into contact with the magnetic frame end plate, which is an easily replaceable member, so even if the valve body repeats opening and closing operations, the magnetic tube remains There is no wear and tear, and as a result, the magnetic frame end plate only needs to be replaced instead of the magnetic tube, which can significantly reduce the costs associated with product maintenance.

Hereinafter, embodiments of the present invention will be described in detail based on the drawings. In FIG. 1, 1 is a solenoid part equipped with a fluid inflow path 2, 3 is a valve part equipped with a fluid outflow path 4, The inflow path 2 and the outflow path 4 are disconnected by the electromagnetic force in the solenoid section 1 and the pressure of the fluid supplied to the inflow path 2.

The solenoid section 1 includes a magnetic tube 5 forming the inflow path 2 in the center thereof, and has a plurality of sulins 5a cut out in the axial direction at one end thereof as fluid flow paths.

5a..., a non-magnetic flange 6 is fitted and fixed, and a magnetic plate 7 is fitted to the other end of the magnetic tube 5 and fixed with a nut l-8, whereby the bobbin 9 It consists of

The bobbin 9 has an insulating means applied to its inner surface, and then an excitation coil 10 is wound around the outside of the magnetic tube 5, and a magnetic frame 12 is provided around the bobbin 9.

The magnetic frame 12 includes a cylindrical portion 12a and an end plate 12b, and seals between the end plate 12b and the non-magnetic flange 6 with an O-ring 11, so that the cylindrical portion 12a is connected to the magnetic plate 7.
The end plate 12b of the magnetic frame 12 has a through hole 12C in its center and a plurality of through holes 1 around it.
2 d, 12 d, . . . are bored, and the inflow path 2 in the magnetic tube 5 is communicated with the valve portion 3 through these through holes 12C, 12d.

Outflow path 4 in the valve section 3 connected to the solenoid section 1
is formed inside the valve box 13 screwed to the magnetic frame 12,
The valve mechanism 14 that opens the outflow passage 4 has a plurality of through holes 15 a, 15 a, . · are provided around the inlet, and valve seats 15b, 15b, · are provided on the mouth edge of the inlet passage 2 side of the through hole.
... are formed, and the valve seats 15b, 15b.

A flapper-shaped valve body 16 that opens and closes them.
It is constructed by arranging .

Further, a recess 15C is provided in the central portion of the valve seat body 15 to form a pressure chamber, and a through hole 16a communicating with the recess 15C is bored in the valve body 16.

The valve body 16 is made of a magnetic material, and a magnetic path is formed around the excitation coil 10 by the magnetic frame 12, the valve body 16, the magnetic tube 5, and the magnetic plate 7.

Therefore, the valve body 16 is brought into contact with the valve seat body 15 by the fluid pressure from the inflow path 2, and the valve seats 15b, 15b, .
. Through hole 1 in valve seat body 15 through the flow path of the system
5a.

15a, . Hole 1
5a, 15a, . . . from inside the rows into the through holes 15a, 15a, .
a, 5a,..., through holes 12d, 1 of end plate 12b
2d.

. . . and the valve seat body 1 through the outer peripheral portion of the valve body 16.
5 through holes 15 a, 15 a, ... From the outside of the row, those through holes 15 a, 15 a, ...
It is configured so that it flows into the

In the figure, 17 is an O-ring for sealing, and 15d is a guide wall provided at multiple locations on the valve seat body 15 to guide the movement of the disc-shaped valve body 16.

The solenoid valve constructed in this way has a coil 10 shown in FIG.
When not energized, the pressure of the fluid such as air supplied to the inflow path 2 presses the valve body 16 against the valve seat body 15, whereby each valve seat 15b, 15b, . . .・is closed.

On the other hand, when the coil 10 shown in FIG. 2 is energized, the valve body 1
6 is attracted to the end plate 12b of the magnetic frame 12 against the fluid pressure, and the valve seats 15b, 15b, . It flows out into the outflow path 4 through the flow path shown by the arrow.

When the current to the coil 10 is cut off, the pressure of the fluid causes the valve body 16 to close to the valve seats 15b, 15b.

Of course, it is necessary to block off...

FIG. 3 shows a second embodiment of the present invention, in which an electrically insulating bobbin 19 integral with the non-magnetic flange 6 in the embodiment of FIG. 1 is fitted and fixed onto the magnetic tube 5. An excitation coil 20 is wound.

Further, in the third embodiment shown in FIG. 4, the cylindrical portion 12a and the end plate 12b of the magnetic frame 12 in the embodiment shown in FIG. 1 are separated.

Note that the other configurations are the same as those in Figure 1, so
The same reference numerals are given to the main parts, and the explanation thereof will be omitted.

[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 a main part showing its operating state, and FIGS. 3 and 4 are sectional views showing different embodiments. 1...Solenoid part, 2...Inflow path,
3... Valve part, 4... Outlet path, 5...
...Magnetic tube, 9,19...Bobbin, 10.2
0... Excitation coil, 12... Magnetic frame, 12b... End plate, 13... Valve box, 1
4... Valve mechanism, 15... Valve seat body, 15
a...Through hole, 15 b...Valve seat, 1
6...Valve body.

Claims (1)

[Scope of utility model registration request] A solenoid section is formed by winding an excitation coil around a bobbin on the outside of a magnetic tube whose interior is a fluid inflow path, and a magnetic frame is placed around the coil, and a valve section connected to the solenoid section includes: A valve mechanism is provided that connects the outflow passage in the valve box screwed to the magnetic frame, and a plurality of through holes are provided around the valve seat body that is sandwiched between the valve box and the magnetic frame. At the same time, a valve seat is formed on the inlet side mouth edge of the through hole, and a flapper-shaped annular valve body made of a magnetic material for opening and closing the valve seat is disposed opposite to the valve seat. In addition, an annular end plate is provided that attracts the valve body to the surface facing the valve seat with the valve body separated from the end side of the magnetic tube when the coil is energized, and the fluid in the magnetic tube is connected to the end plate through the through hole of the valve seat body. A solenoid valve characterized in that a plurality of through holes are provided around the row to allow flow into the through holes from outside the row.