JPH0440047Y2 - - Google Patents

Description

[Detailed Description of the Invention] [Industrial Application Field] The present invention relates to a switching valve that controls fluid flow by switching a flow path.

[Conventional technology and its problems]

For example, as a four-way switching valve that has two inlets A and B and two outlets C and D, and simultaneously switches the flow of fluid from A to C and B to D to the flow from A to D and B to C, Plunger type and ball valve type types are known, but these conventional switching valves have complex structures and are prone to errors in manufacturing or operation, so it is not possible to completely close all valve parts. There is a problem that cannot be done.

[Means for solving problems]

In order to solve these problems, this invention
The first to fourth stems are formed in line in the axial direction on the inner periphery of the body through which the stem is inserted so as to be able to reciprocate in the axial direction.
a valve seat, first and second disks provided on the stem so as to be freely movable in the axial direction, and a spring compressed between the two disks, the first disk supporting the first valve facing each other. The second disk is disposed between the third valve seat and the second valve seat, and the second disk is arranged between the third valve seat and the second valve seat.
and the fourth valve seat, and the stem has a
A stopper is provided for regulating the distance between the two disks to be longer than the distance between the first valve seat and the third valve seat and the distance between the second valve seat and the fourth valve seat.

[Effect]

In other words, the switching valve of the present invention has a first valve seat and a third valve seat.
Even if there is an error in the distance between the second valve seat and the fourth valve seat, the spring between both discs absorbs this error, thus causing the stem to move in the axial direction. Accordingly, the first and second disks can reliably close both the first and third valve seats or both the second and fourth valve seats.

〔Example〕

Next, the present invention will be explained in more detail with reference to the drawings.

1 to 3 show the state before switching of the switching valve, which switches by supplying air.

A cylinder 2 is connected to the upper side of the body 1 so as to sandwich a bonnet 3 in an airtight manner, and a cover 4 is attached to the lower side of the body 1 in an airtight manner. A piston 6 is attached to the upper end of the stem 5 inserted into the shaft hole 3a of the bonnet 3, and a first
A spring 7 is loaded, and by this pushing up, the piston 6 and stem 5 are positioned at the substantial upper limit of their stroke. piston 6 and stem 5
To lower the piston, air is supplied from the air supply port 8 provided in the cylinder 2 to the cylinder chamber 9 above the piston 6, and the spring 7 is compressed using the pressure. The stem 5 with the stem guide 10 inserted into the lower end is slidably inserted into the guide hole 4a provided in the cover 4, and the knock pin 11 is inserted into the lower cylindrical portion 3 of the bonnet 3.
It is configured to engage with an engagement hole 3c provided in b and move up and down smoothly without axial vibration or rotation. The first flange 5a of the stem 5 in which the knock pin 11 is installed and the upper cylindrical portion 3d of the bonnet 3
A bellows 12 is installed between them, and the space above and below the bonnet 3 is completely blocked off. A space between the bonnet 3 and the piston 6, whose volume increases and decreases as the piston 6 moves up and down, communicates with the atmosphere through a vent hole 2a provided in the cylinder 2. The lower cylindrical portion 3b of the bonnet 3 and the cylindrical portion 4b of the cover 4 are in airtight contact with the inner wall of the body 1 via O-rings 13 and 14 at their respective tips. First to fourth valve seats 15, 16, 17, and 18 are provided on the upper and lower inner edges of an annular protrusion 1a formed stepwise on the inner wall of the body 1. These four valve seats 15, 16, 1 are lined up and down in a row along the stroke direction of the stem 5.
7, 18, the first valve seat 15 located above
and a second valve seat 16, and a third valve seat 1 located below.
7 and the fourth valve seat 18 are formed to face each other, and one disk 2 is provided for each set.
4 and 25 will be shared. Further, the space within the body 1 bordered by these four valve seats 15, 16, 17, and 18 is a first chamber 1 above the first valve seat 15.
9, the second valve seat between the first and second valve seats 15 and 16;
chamber 20 , a third chamber 21 between the second and third valve seats 16 and 17 , a fourth chamber 22 between the third and fourth valve seats 17 and 18 , and a space below the fourth valve seat 18 . It is partitioned into a fifth chamber 23. A first disk 24 is installed in the second chamber 20 and seats on the first and second valve seats 15 and 16, and a first disk 24 is installed in the fourth chamber 22 and seats on the third and fourth valve seats 17 and 18. second disk 25
Both disks 24 and 25 are connected by the second flange 5b as a stopper provided on the stem 5 and the stem guide 10 also as a stopper.
The distance between the first valve seat 15 and the third valve seat 17 is
distance between the second valve seat 16 and the fourth valve seat 18
The O-rings 26 and 27 are slidably inserted into the stem 5 and are sealed by O-rings 26 and 27 fitted into the grooves of the stem 5 while the distance is regulated to be longer than the distance between the two stems. has been done. A second spring 28 is elastically mounted between the two disks 24, 25 via washers 29, 30 for biasing the two disks 24, 25 in a direction away from each other.
In the illustrated state before switching, the first disk 24
is placed on the first valve seat 15, and the second disk 25 is placed on the third valve seat 15.
It is seated on the valve seat 17 of. The body 1 has first and second fluid inflow ports 31, 32 (see Figure 1) and first and second fluid outflow ports 33, 3.
4 (see Figure 2). The first inflow port 31 is connected to the first chamber 19 through a vertical hole 1b bored in the body 1 and a communication hole 3e and an engagement hole 3c formed in the lower cylindrical portion 3b of the bonnet 3. The hole 1b is connected to the fifth chamber 23 via a communication hole 4c provided in the cylindrical portion 4b of the cover 4. The second inflow port 32 is connected to the third chamber 21 via the horizontal hole 1c. The first outflow port 33 and the second outflow port 34 are each connected to the oblique hole 1.
It is connected to the second chamber 20 or the fourth chamber 22 via d and 1e. The first disk 24 is attached to the first valve seat 15, and the second disk 25 is attached to the third valve seat 17.
In the illustrated state in which the person is seated in the chamber, the fluid supplied from the first inflow port 31 flows downward through the vertical hole 1b, passes through the communication hole 4c, and exits the fifth chamber 23, which is opened. The flow flows into the fourth chamber 22 through the space between the disc 25 and the fourth valve seat 18, and the diagonal hole 1
d to the first outflow port 33. The fluid fed from the second inflow port 32 is fed through the horizontal hole 1c.
The flow flows from the valve to the third chamber 21, passes between the first disk 24, which is open, and the second valve seat 16, and flows into the second chamber 2.
0 and flows out from the second outflow port 34 through the oblique hole 1e. From this state, air is supplied to the cylinder chamber 9 to push down the piston 6 and stem 5, and the first disk 24 is seated on the second valve seat 16 and the second disk 25 is seated on the fourth valve seat 18. , the fluid from the first inflow port flows upward through the vertical hole 1b, passes through the communication hole 3c, and enters the first chamber 1.
The first disk 24 and the first disk newly opened from 9
flows into the second chamber 20 through between the valve seats 15,
It is sent to the second outflow port 34 via the oblique hole 1e. The fluid flowing into the third chamber 21 from the second inflow port 32 flows through the newly opened second disk 25.
and the third valve seat 17 into the fourth chamber 22, and flows out from the first outflow port 33 through the oblique hole 1d (see FIG. 4).

During this switching operation, if the spacing between the two disks 24, 25 and the spacing between the valve seats 15, 16, 17, 18 are made accurately without manufacturing errors, both the disks 24, 25 will be switched between the second and fourth disks. valve seat 16,1
8 at the same time to reliably block the flow path before switching, without causing any problems. However, in reality, the second disk 25 is connected to the fourth valve seat 18.
When you sit down, the first disk 24 is still in the second position.
This tends to cause inconveniences such as not being able to close the flow path because it does not reach the valve seat 16 of the valve. The switching valve is configured to prevent such a situation from occurring.

That is, the first and second disks 24 and 25, which are urged away from each other by the spring 28, are arranged between the first valve seat 15 and the third disk between the second flange 5b and the stem guide 10. Valve seat 1
7 and the distance between the second valve seat 16 and the fourth valve seat 1
By supplying air to the cylinder chamber 9, the piston 6 and the stem 5 can be displaced over a distance longer than the distance between the first spring 7 and the first spring 7.
When the second disk 25 descends against the spring force, the second disk 25 first seats on the fourth valve seat 18. The air pressure is determined by the spring force of the first and second springs and the fourth spring.
The force is set to be sufficient to close the valve seat 18, and since the disc 25 is slidably inserted into the stem 5, the stem 5 is set to have sufficient force to close the valve seat 18.
While keeping the second disk 25 seated on the valve seat stationary, the second disk 24 continues to be lowered while compressing the second spring 28, and the first disk 24 is seated on the second valve seat 16. The second disk 25 is the fourth valve seat 1
A second spring 28 having a spring force that closes 8
It is maintained seated on the fourth valve seat 18 by this (FIG. 3→FIG. 4). On the contrary, the fourth
When the air supply is removed from the state shown in the figure and the piston 6 and stem 5 are raised, the first disk 24
However, due to the spring force of the second spring 28 which has been compressed to some extent, it immediately follows and is seated in advance of the first valve seat 15. Stem 5 is the first
The second disk 25 continues to rise while compressing the second spring 28, leaving only the second disk 24.
is seated on the third valve seat 17. The first disk 24 is kept seated on the first valve seat 15 by a second spring 28 having a spring force that closes the first valve seat 15 (Fig. 4→Fig. 3). ).

[Effect of idea]

As explained above, the switching valve of the present invention has a distance between the first valve seat and the third valve seat, and a distance between the second valve seat and the fourth valve seat.
Even if there is an error in the distance between the two valve seats, the spring between both disks absorbs this error, so the first and second disks are connected to both the first and third valve seats, or the second and fourth valve seats. Both valve seats can be reliably closed, and the flow path can be reliably switched even when the type of fluid flowing through multiple systems or the pressure conditions are different, making it highly reliable and usable for a wide range of applications. products that can be provided,
The practical effects of this invention are extremely large.

[Brief explanation of the drawing]

Fig. 1 is a front sectional view of a switching valve according to an embodiment of the present invention, Fig. 2 is a side sectional view, Fig. 3 is an enlarged sectional view of the main part, and Fig. 4 is an enlarged sectional view of the main part showing the state after switching. It is a diagram. 1...Body, 1a...Annular protrusion, 1b...Vertical hole, 1c...Horizontal hole, 1d, 1e...Oblique hole, 2...
Cylinder, 3...Bonnet, 3b...Lower cylindrical part, 3d...Upper cylindrical part, 3e, 4c...Communication hole,
4... Cover, 5... Stem, 5b... Flange, 6... Piston, 7, 28... Spring,
8...Air supply port, 10...Stem guide,
12... bellows, 13, 14, 26, 27...
O-ring, 15, 16, 17, 18... Valve seat, 2
4, 25...Disk, 31, 32...Fluid inflow port, 33, 34...Fluid outflow port.

Claims (1)

[Scope of utility model registration request] first to fourth valve seats formed in line in the axial direction on the inner periphery of the body through which the stem is inserted so as to be freely reciprocating in the axial direction; The valve includes a disk and a spring compressed between the two disks, the first disk being disposed between a first valve seat and a second valve seat facing each other, and the second disks facing each other. Disposed between the third valve seat and the fourth valve seat, the stem is provided with a distance between the first valve seat and the third valve seat and a distance between the second valve seat and the fourth valve seat. A switching valve characterized by having a stopper that regulates the distance longer than the seat distance.