JP3059614B2 - Slide valve - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a slide valve, and more particularly, to a miniaturization and high-speed operation by effectively utilizing a valve chamber in which a valve element and a spool are housed as a flow path of a working fluid. And related slide valves.

[0002]

2. Description of the Related Art A slide valve for switching a load includes, for example, a valve seat 103 which covers a lower surface of a valve chamber 102 formed in a valve box 101, as shown in a vertical sectional side view of FIG. 104 which is inserted so that it can advance and retreat, and this spool
A valve element which is driven by the valve 104 and slides along the upper surface of the valve seat 103
105.

The valve seat 103 corresponds to an inlet port 106 opened on the upper surface, two load connecting outlet ports 107A and 107B which are alternatively connected to the inlet port 106, and outlet ports 107A and 107B. Two exhaust ports 108
A. 108B. In addition, outlet ports 107A and 107B are provided on the lower surface of the valve body 105, respectively.
Passages 109A and 109B for switching connection to the corresponding exhaust ports 108A and 108B are recessed side by side in the sliding direction of the valve body 105 (hereinafter simply referred to as sliding direction).

As shown in FIGS. 7 and 8, the valve body 105 is driven by a spool 104 and slid so that a central portion between the two passages 109 A and 109 B of the valve body 105 is provided. By overlapping the lower surface 110 with the sliding surface 111 of the valve seat 103 on either side of the sliding direction 111 in the sliding direction 111A or 111B, one of the outlet ports 107B (or 107A) is shut off from the inlet port 106. At the same time, the outlet port 107B communicates with the exhaust port 108B via the passage 109B, and the other outlet port 107A (or 107B) communicates with the inlet port 106 via the passage 109A (or 109B).

[0005] An exhaust port 1 corresponding to the outlet port 107A (or 107B) which is in communication with the inlet port 106.
08A (or 108B) shuts off the corresponding outlet port 107A (or 107B) and inlet port 106 at both ends of the valve body 105 in the sliding direction. The driving method of the spool 104 is manual, electric, pneumatic,
Various systems such as hydraulic drive are employed. Also, especially when high-speed valve switching is required, the above valve seat is required.
The 103 and the valve element 105 are often made of ceramics having excellent wear resistance.

In this conventional slide valve, when the pressure management of each of the outlet ports 107A and 107B and each of the load circuits connected thereto is strict, for example, as shown in FIG. , The lower surface 110 at the center,
Covering the inlet port 106, both outlet ports 107A and 107B
Are simultaneously shut off from the inlet port 106, and both outlet ports 107A and 107B are
It is designed to be cut off from 108A and 108B.

A valve 105 and a valve seat 10 are provided between the ports.
3 is required to be longer than a certain length a in order to secure the sealing property between the first and third members. Further, the flow path cross-sectional area of each port is determined by a required flow rate of a working fluid such as compressed air and a dimension in a direction perpendicular to a sliding direction of each port (hereinafter, referred to as a width direction). The dimension in the width direction is limited to a certain value or less in accordance with the dimension in the width direction of the solenoid valve provided by, for example, an ISO standard.

The length of the valve body 105 in the sliding direction is as follows: the length of the lower surface 110 at the center, the length of the passages 109A and 109B on both sides thereof, twice the stroke of the valve body 105, and both exhaust ports. The length is set to the sum of the length 2a of the sealing surface required on both outer sides of 105 and 106. Now, assuming that the length in the sliding direction required by each port to obtain a predetermined flow rate is b, the length of the lower surface 110 at the center is set to the length b in the sliding direction of the inlet port 2 and the valve The stroke of the seat 105 is set to a length 2b obtained by adding the length b of the inlet port 106 in the sliding direction and the length b of the lower surface 110 at the center. In addition, the above passages 109
A ・ 109B in the sliding direction is the length of each outlet port 107A ・
In order to make the cross-sectional area of the passage of 107B a predetermined size, the exhaust ports 105 and 106 corresponding to the respective outlet ports 107A and 107B.
It is necessary to set the length (a + 2b) to the sum of the distances a and 2b.

Therefore, the length of the valve element 105 in the sliding direction is the length b of the sliding direction of the lower surface 110 at the central portion and the length (a + 2b) of the passages 109A and 109B on both sides in the sliding direction.
Double the length, twice the length of the stroke 2b of the valve body 105, and twice as long as the length a in the sliding direction of each sealing surface required on both outer sides of the exhaust ports 105 and 106. The total length is set to (4a + 9b).

The length of the valve seat 103 in the sliding direction is the same as the valve seat.
The length (4b + 11b) is obtained by adding the stroke 2b of the valve seat 105 to the length (4a + 9b) in the sliding direction of 105.

[0011]

Therefore, in a slide valve requiring a large flow rate, the length b in the sliding direction of each port is increased in order to obtain a required flow rate while complying with a standard such as ISO. It is necessary to choose between accepting that the entire slide valve is enlarged in the sliding direction, accepting that the flow rate is insufficient to avoid enlargement, or ignoring standards such as ISO. There is a disadvantage that it cannot be obtained.

[0012] Of these, ignoring standards such as ISO impairs the versatility of products, and is therefore only allowed in extremely limited cases. However, since the load is limited, it is not preferable, and in the end, it is often the case that a normal production is liable to increase in size. However, when the lengths of the valve seat 103 and the valve body 105 increase, the valve body 105
5 (hereinafter referred to as the sliding area) and the sliding resistance of the valve body 105 increases, so that the valve switching speed becomes slower and the spool 104 drives the valve body 105 in the sliding direction. It is necessary to increase the force to be applied (hereinafter referred to as thrust), which causes a problem that the spool 104 must have a large diameter and must be further enlarged.

SUMMARY OF THE INVENTION The present invention has been made in view of the above-described circumstances, and has been made to reduce the size and speed by using a valve chamber in which a valve body and a spool are stored as a flow path of a working fluid. It is an object of the present invention to provide a slide valve that can be designed.

[0014]

According to the present invention, there is provided a valve seat which covers a lower surface of a valve chamber formed in a valve box, a spool which is inserted into and retractable from the valve chamber, and an upper surface of the valve seat which is driven by the spool. , The valve seat corresponding to an inlet port opened on the upper surface, two load connecting outlet ports which are alternatively connected to the inlet port, and each outlet port. It has two exhaust ports, and one of the two outlet ports is alternatively connected to the inlet port by sliding the valve body, and the other outlet port is connected to the corresponding exhaust port. In order to achieve the above object, the following measures are taken in the slide valve.

That is, according to the present invention, an inlet port communicating with a valve chamber is opened at a side edge portion of the valve seat, and both outlet ports and both exhaust ports are opened at the center of the valve seat in a sliding direction. An inlet-side passage is formed at the center of the lower surface of the valve body to selectively connect the two outlet ports to the valve chamber, and the outlet port blocked from the valve chamber is provided on both sides in the sliding direction with an exhaust port. And an exhaust-side passage communicating with the exhaust port is formed.

[0016]

According to the present invention, the inlet port may be opened at both edges in the width direction of the valve seat, or may be opened at one side edge thereof. The working fluid flowing into the valve chamber from the inlet port flows into one of the outlet ports via the inlet passage formed in the valve body, and the working fluid in the outlet port blocked from the inlet passage is formed in the valve body. The exhaust gas flows out to the corresponding exhaust port through the exhaust-side passage.

At the center in the width direction of the upper surface of the valve seat, four ports, two outlet ports and two exhaust ports, are opened side by side in the sliding direction. In addition to these four ports, an inlet port is provided. Since the length of the valve seat and the valve body in the sliding direction is shorter than that of the conventional example in which the sliding valves are arranged side by side in the sliding direction, the entire slide valve can be reduced in length in the sliding direction. The sliding contact area of the valve element is reduced, the sliding resistance of the valve element is reduced, and the switching speed of the valve is increased.

Further, since the sliding resistance of the valve body is reduced,
Since the valve body can be driven with a weak thrust, the diameter of the spool can be reduced, and the entire slide valve can be reduced in the direction perpendicular to the sliding direction.

[0019]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS Hereinafter, a slide valve according to one embodiment of the present invention will be specifically described with reference to the drawings. However, the present invention is not limited to this embodiment, and is not limited to this specification and the accompanying drawings. The present invention extends widely over the true intended scope of the invention as apparent from the drawings.

A slide valve according to an embodiment of the present invention shown in a longitudinal side view of FIG. 1 and an exploded perspective view of FIG. 2 includes a valve seat 3 for covering a lower surface of a valve chamber 2 formed in a valve box 1, and a valve chamber. A spool 4 is inserted through the spool 2 so as to be able to advance and retreat, and a valve element 5 driven by the spool 4 and slid along the upper surface of the valve seat 3. Further, the lower surfaces of the valve seat 3 and the valve box 1 are covered with a valve seat retainer 12 also serving as an interface, and further, a pipe mounting base 13 is fixed to the lower surface of the valve box 1.

The upper surface 14 of the valve seat 3 is provided with inlet ports 6 at both side edges in the width direction, and two outlet ports 7A and 7B are provided at the center of the upper surface 14 of the valve seat 3. Opened side by side in the direction of movement. Also, the upper surface 14 of the valve seat 3
Exhaust ports 8A and 8B corresponding to the outlet ports 7A and 7B are opened on both outer sides in the sliding direction of the outlet ports 7A and 7B at the center in the width direction.

On the lower surface of the valve element 5, a groove width substantially equal to the sliding direction length b of each of the outlet ports 7A and 7B is provided at the center in the sliding direction over the entire length of the valve element 5 in the width direction. And an outlet port 7B (or 7A), which is cut off from the valve chamber 2 by the valve body 5, on the lower surface on both sides in the sliding direction of the inlet side passage 9 and an exhaust port 8
Exhaust-side passages 10A and 10B communicating with B (or 8A)
Is formed.

Further, a semi-cylindrical groove 11 corresponding to the lower peripheral surface of the small diameter portion of the spool 4 is formed in the upper surface of the valve body 5. now,
As shown in the schematic diagrams of FIGS. 3 to 5, the inlet-side passage 8 and the outlet ports 7A and 7B are used to secure a required flow rate.
The length in the sliding direction required for each of the exhaust ports 8A and 8B is represented by b, and is required between each of the outlet ports 7A and 7B and the corresponding exhaust port 8A and 8B in order to maintain the sealing performance. As shown in FIG. 4, the interval between the two outlet ports 7A and 7B of the valve seat 3 is set so that the two outlet ports 7A and 7B do not communicate with the inlet side passage 9 at the same time, as shown in FIG. The groove width of the inlet-side passage 9, that is, the length b in the sliding direction of each of the outlet ports 7 </ b> A and 7 </ b> B is set to the same length.

The inlet side passage 9 and each exhaust side passage 10A
10B, an inner sealing surface 15 formed on the lower surface of the valve body 5
When the valve body 5 is at the stroke end, the length of the outlet port 3 which is in communication with the valve chamber 2
(Or 4) may be cut off from the corresponding exhaust port 5 (or 6), so that this interval is set to a smaller than b.

Further, the length of each of the exhaust side passages 10A and 10B in the sliding direction is determined by the length of the outlet port 7B which is shut off from the valve chamber 2.
(Or 7A) and the corresponding exhaust port 8B
(Or 8A) and maintain the required sliding length (b + b) and sealing properties required for each outlet port 7A, 7B and each exhaust port 8A, 8B to ensure the required flow rate. In order to achieve this, it is necessary to have a length equal to or greater than the total length (a + 2b) of the interval a required between each of the outlet ports 7A and 7B and the corresponding exhaust port 8A and 8B.

In this embodiment, both outlet ports 7A and 7B
Is equal to b, the length in the sliding direction of each of the exhaust-side passages 10A and 10B is equal to this length (a + 2b).
The length 3b is obtained by subtracting the length a of the inner sealing surfaces 15A and 15B in the sliding direction from the length [b + (a + 2b)] obtained by adding the interval b between A and 7B. Further, the exhaust side passage 10A
On the lower surface of the valve body 5 on both outer sides in the sliding direction of 10B, to seal between the exhaust ports 8A and 8B and the valve chamber 2, slide on both sides of the valve body 5 in the sliding direction. Outer sealing surfaces 16A and 16B having a length a in the direction are provided.

As a result, the length of the valve element 5 in the sliding direction is (4a + 6b), and the length of the valve seat 3 in the sliding direction is equal to the length of the valve element 5 in the sliding direction (4a + 6b). The length (4a + 9b) obtained by adding the stroke 3b of the body 5 becomes the valve seat 3
And the valve body 7 can be shortened by 2b each from the valve seat 103 and the valve body 105 of the conventional example. In addition, the above piping mount 13
Has one inlet port 17, two outlet ports 18A and 18B and two exhaust ports 19A and
19B is provided, and the valve seat retainer 12 has one inlet passage 20 and two outlet passages 21A and 21B which are respectively communicated therewith.
And two exhaust passages 22A and 22B.

The inlet passage 20 is branched in the width direction in the valve presser 12, and is opened at the upper surface of the valve presser 12 into two long holes extending in the width direction. As a result, the inlet port 17 of the pipe mount 13 is communicated with the two inlet ports 6 formed on both side edges of the valve seat 3 via the inlet passage 20. The two outlet passages 21A and 21B and the two exhaust passages 22A and 22B respectively correspond to two corresponding outlet ports 7A and 7B of the valve seat 3.
And two exhaust ports 8A and 8B.

Although the slide valve can be configured to be switched by manual operation, in this embodiment, cylinder chambers 23A and 23B are formed on both sides of the valve chamber 2 as shown in FIG. Then, the spool 4 is driven by supplying and discharging compressed air to the pressure receiving chambers 25A and 25B formed on both outer sides of the pistons 24A and 24B inserted into the cylinder chambers 23A and 23B via the pilot solenoid valves 26A and 26B. ing.

Further, in the above-described embodiment, the inlet ports 6 are formed at both side edges in the width direction of the valve seat 3, but each of the outlet ports 7A and 7B and each of the exhaust ports 8A and 8B are formed in the width direction. It is also possible to deviate to one side and form the inlet port 6 only on the other side edge in the width direction of the valve seat 3.

[0031]

As described above, according to the present invention, the inlet port communicating with the valve chamber is opened at the side edge in the width direction of the valve seat, and both outlet ports and both exhaust ports are provided at the center of the valve seat. A port is opened side by side in the valve body sliding direction, and the valve body is composed of two valve bodies divided in the sliding direction, and both outlet ports are selectively communicated with the valve chamber between the two valve bodies. In addition to the above, an inlet-side passage is formed, and an exhaust-side passage is formed in each valve body to communicate an outlet port, which is shut off from the valve chamber, to an exhaust port.

This makes it possible to reduce the size of the valve seat and the valve body in the sliding direction of the valve body to reduce the size of the slide valve, and to reduce the sliding contact area between the valve body and the valve seat to reduce the size of the valve body. It is possible to obtain the effect that the sliding resistance is reduced, the switching speed of the valve is further increased, and the diameter of the spool is reduced to make the entire slide valve more compact.

[Brief description of the drawings]

FIG. 1 is a vertical side view of one embodiment of the present invention.

FIG. 2 is an exploded perspective view of a main part of one embodiment of the present invention.

FIG. 3 is a schematic diagram at the time of connection A in one embodiment of the present invention.

FIG. 4 is a schematic diagram of a transition period of one embodiment of the present invention.

FIG. 5 is a schematic diagram at the time of connection B according to one embodiment of the present invention.

FIG. 6 is a longitudinal sectional side view of a conventional example.

FIG. 7 is a schematic diagram at the time of connection B in a conventional example.

FIG. 8 is a schematic diagram of a conventional example during a transition period.

FIG. 9 is a schematic diagram at the time of connection A in a conventional example.

[Description of sign]

 DESCRIPTION OF SYMBOLS 1 ... Valve box 2 ... Valve chamber 3 ... Valve seat 4 ... Spool 5 ... Valve body 6 ... Inlet port 7A / 7B ... Outlet port 8A / 8B ... Exhaust port 9 ... Inlet side passage 10A / 10B ... Exhaust side passage

Continuation of front page (56) References JP-A-54-29123 (JP, A) JP-A 63-187777 (JP, U) JP-A 62-86482 (JP, U) JP-A 59-191470 (JP) , U) Japanese Utility Model Showa 62-8468 (JP, U) Japanese Utility Model Showa 62-8467 (JP, U) (58) Fields investigated (Int. Cl. ⁷ , DB name) F16K 3/00-3/36 F16K 11/00-11/24 F16K 27/00-27/04 F16K 31/12-31/165

Claims (1)

(57) [Claims] 1. A valve seat that covers a lower surface of a valve chamber formed in a valve box, a spool that is inserted into the valve chamber so as to advance and retreat, and a valve body that is driven by the spool and slides along the upper surface of the valve seat. The valve seat has an inlet port opened on the upper surface, two outlet ports for load connection alternatively connected to the inlet port, and two exhaust ports corresponding to each outlet port, By sliding the valve, one of the two outlet ports is alternatively connected to the inlet port,
In a slide valve in which another outlet port is connected to a corresponding exhaust port, an inlet port communicating with a valve chamber is opened at a side edge of the valve seat, and both outlet ports and both outlet ports are provided at a central portion of the valve seat. The exhaust port is opened side by side in the sliding direction,
An inlet-side passage is formed at the center of the lower surface of the valve body to selectively connect the two outlet ports to the valve chamber, and an outlet port cut off from the valve chamber is connected to the exhaust port on both sides in the sliding direction. A slide valve, wherein an exhaust-side passage is formed.