JP2599482Y2 - Valve assembly - Google Patents

Description

[Detailed description of the invention]

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a stacking type switching valve provided with a supply port and a discharge port for a pressurized fluid which are connected in series, and an output port opened on a front surface substantially orthogonal to the connection surface. It is.

[0002]

2. Description of the Related Art A so-called stacking type switching valve having a supply port and a discharge port for a pressure fluid which are communicated by a continuous connection, and an output port opened at a front surface substantially orthogonal to a continuous surface is already known. Since this switching valve can be directly connected without using a base, there is an advantage that when a plurality of switching valves are connected, the whole can be reduced in size and piping to the output opening is easy. However,
When a plurality of the switching valves are connected in series, if there is a difference in the capacity of a load (for example, a fluid pressure actuator) connected to the output port of each switching valve, a large amount of the load is temporarily discharged from the large capacity load. Fluid may flow back from the communicating discharge port to another switching valve, causing that switching valve to malfunction.

[0003]

SUMMARY OF THE INVENTION It is an object of the present invention to provide a valve assembly which does not malfunction due to backflow of discharged fluid.

[0004]

In order to solve the above-mentioned problems, the valve assembly of the present invention has a supply port and a discharge port for a pressure fluid which are connected by a continuous connection, and an opening at a front surface which is substantially perpendicular to the connection surface. A plurality of switching valves having an output port and a spool for switching the output port between a supply port and a discharge port to communicate with each other, wherein the switching valve opens the discharge port to the lower surface of the valve. A base including the passage, the switching valve being provided, a discharge passage in a direction in which the switching valve is connected, a discharge passage connecting the discharge passage of the switching valve to the discharge passage, and a discharge passage in the discharge passage. A check valve for permitting the fluid to flow into the discharge passage and preventing backflow into the discharge passage, wherein the communication of the discharge ports of these switching valves is closed by a closing member, and the switching valve is installed on the base. Features.

[0005]

When a plurality of switching valves are connected to each other by blocking the communication of the discharge port with the closing member, the supply ports of these switching valves are connected. When the continuously provided switching valves are installed on the base to form a valve assembly, the discharge passage of each switching valve communicates with the exhaust passage of the base via the check valve and the communication passage. Therefore, the fluid discharged from the discharge port of each switching valve is:
The liquid is collectively discharged from the discharge path of the base through the discharge path, the check valve, and the discharge path. In this case, the discharge fluid flowing through the discharge flow path is blocked by the check valve and does not flow back to the discharge port of another switching valve, so that malfunction of the switching valve due to the reverse flow of the discharge fluid can be prevented.

[0006]

FIG. 1 shows an embodiment of the present invention. A switching valve 2 constituting a valve assembly 1 shown in FIG. 2 includes a main valve 3 and a pilot valve 4 driven by a solenoid. Then 8
The end plates 6 and 6 that are connected to each other and installed on the base 5 and that cover the connecting surface of the switching valve 2 and the side surface of the base 5 are mounted on both sides in the connecting direction of the switching valve 2 by appropriate means. . The valve body 8 of the main valve 3 has a supply port P and a discharge port EA, EB of the pressurized fluid which are connected by the connection.
And output ports A and B on the front surface substantially orthogonal to the connecting surface,
These ports are provided with axial valve holes 9 that open, and so-called one-touch fittings 10, 1 are provided at output ports A, B.
0 is detachably mounted by a U-shaped mounting bracket 11. In the valve body 8, discharge passages 12a and 12b for opening discharge ports EA and EB to the lower surface are provided.
Has been established.

The piston box 1 is provided on the rear surface of the valve body 8.
The pilot valve 4 is mounted via a piston 4, and a piston 17 that presses a spool 16 slidably inserted into a valve hole 9 via a sleeve in a piston chamber 15 formed in a piston box 14 is slidable. The return spring 19 is contracted between the spool 16 and the closing body 18 that is inserted into the valve hole 9 and closes the other end of the valve hole 9. When the pilot fluid is supplied from the pilot valve 4 to the piston chamber 15, the spool 16 is pressed by the piston 17 to make the supply port P communicate with the output port A, and the output port B communicates with the discharge port EB. When the pilot fluid is discharged, the state returns to the state shown in FIG. 1 in which the supply port P and the output port B and the output port A and the discharge port EA communicate with each other by the urging force of the return spring 19.

The pilot valve 4 is configured as a well-known three-port solenoid valve that switches a pilot output port between a pilot supply port and a pilot discharge port (both not shown) and communicates by exciting and releasing the solenoid 4a. The pilot supply port is connected to the supply port P of the valve body 8 by a passage not shown, the pilot output port is connected to the piston chamber 15 of the main valve by the pilot output path 20, and the pilot discharge port is set to the discharge port EA by the pilot discharge path 21. To each other.

The base 5 connects the discharge passages 23a, 23b parallel to the direction in which the switching valve 2 is connected, and the discharge passages 12a, 12b of the switching valves 2,... To the discharge passages 23a, 23b, respectively. , And 24b, and check valves 26, 26 are attached to mounting portions 25, 25 formed in these communication paths 24a, 24b, respectively (see FIGS. 2 and 3). ). The check valve 26 shown in detail in FIG.
7 and a check valve body 28 sliding in the guide 27
And a ring-shaped packing 29 above it, and a spring 30 between the guide 27 and the check valve main body 28. The check valve main body 28 is provided with a center hole 29a of the packing 29.
, A lower cylindrical guide part 32 movably inserted into the guide 27, and a connecting part 33, which connects the space of the guide 27 to the inside of the guide part 32, .. and a flange portion 34 formed on the outer periphery of the guide portion 32.
7 is provided between the grooves.

When the communication between the discharge ports EA and EB is interrupted by an appropriate closing member (not shown) and a desired number of the switching valves 2 are provided, the switching valves 2,. Ports P communicate with each other. Continuously installed switching valve 2, ...
Are mounted on the base 5 with the check valves 26,... Mounted on the mounting portions 25,..., The valve assembly 1 shown in FIG. 2 is formed, and the discharge passages 12a, 12b of each switching valve 2 Of the packings 29,2 by the urging force of the springs 35,35.
9 closely contacts the lower surface of the valve body 8 (see FIG. 3). Next, when the end plates 6 and 6 are mounted on both sides of the switching valves 2 and the base 5,
a, 23b are connected to the collective discharge ports 36, 36 of the end plate 6 to which the one-touch fitting 10 is mounted, and the supply port P of the switching valve 2 is connected to the collective supply ports 37, 37 to which the one-touch fitting 10 is similarly mounted. Communicate with each other

FIG. 1 shows a state in which the excitation of the solenoid 4a of the pilot valve 4 is released, and the supply port P and the output port B and the output port A and the discharge port EA are communicated by the biasing force of the return spring 19. I have. When the solenoid 4a is excited, the piston 17 is actuated by the action force of the pilot air supplied from the pilot valve 4 to the piston chamber 15.
Presses the spool 16 against the urging force of the return spring 19, so that the supply port P communicates with the output port A, and the output port B communicates with the discharge port EB. The exhaust gas discharged from the discharge ports EA and EB due to the sliding of the spool 16 is
The check valve body 28 passes through the discharge passages 12a and 12b,
28, the valve bodies 28, 28 are lowered in the figure, so that the exhaust gas is discharged through the communication passages 24a, 24b to the discharge flow passages 23a, 23b, and the pressure of the exhaust gas is reduced. When lowered, the seal portions 31, 31 are pressed by the packings 29,
Since the center holes 29a, 29a of the 29 are closed, the switching valve 2
Discharge ports EA and EB are closed. In this case, the exhaust gas discharged from the discharge ports EA, EB of the other switching valve 2 presses the check valves 26, 26 in the closing direction of the discharge passages 12a, 12b. Does not flow back to the discharge ports EA and EB of the other switching valves.

In the above embodiment, the discharge passages 12a and 12b are provided in the valve body 8 of the known stacking type switching valve, and the mounting portions 25 and 25 are provided in the communication passages 24a and 24b of the base 5 in which these switching valves are installed. By mounting the check valves 26, 26, the valve assembly 1 free from malfunction due to backflow of exhaust gas can be configured, and thus can be formed by slightly processing the existing stacking type switching valve and base. Therefore, a valve assembly that does not malfunction due to backflow of exhaust gas can be made inexpensive.

Although the switching valve in the above embodiment is a 5-port valve, the switching valve of the present invention is not limited to this, and may be a 3-port valve or a 4-port valve having a common exhaust port. Can be. Further, the base 5 is not limited to a single body, but may be a plurality of bases having substantially the same width as the switching valve 2 and connected in series.

[0014]

The valve assembly of the present invention uses a stacking type switching valve, but has a discharge passage provided in these switching valves and a check valve mounted on a base on which these switching valves are installed. As a result, the discharged fluid does not flow backward to the discharge port of another switching valve, so that a malfunction of the switching valve due to the reverse flow of the discharged fluid can be prevented. Further, by using the stacking type switching valve and the base and performing a slight processing on them, a valve assembly without malfunction can be obtained, so that the valve assembly can be inexpensive.

[Brief description of the drawings]

FIG. 1 is a vertical sectional side view of an embodiment.

FIG. 2 is a front view of the valve assembly.

FIG. 3 is an enlarged view of a main part of a base.

FIG. 4 is an exploded perspective view of the check valve.

[Explanation of symbols]

 Reference Signs List 1 valve assembly 2 switching valve 5 base 12a, 12b discharge passage 16 spool 23a, 23b discharge passage 24a, 24b discharge passage 26 check valve P, A, B, EA, EB port

──────────────────────────────────────────────────続 き Continued on the front page (58) Field surveyed (Int. Cl. ⁶ , DB name) F16K 11/00-11/24 F16K 27/00-27/04 F16K 35/00

Claims (1)

(57) [Scope of request for utility model registration] 1. A spool for supplying and discharging a pressurized fluid which is communicated by a continuous connection, an output port which is opened at a front surface substantially orthogonal to a connecting surface, and a switch which switches an output port between a supply port and a discharge port for communication. Wherein the switching valve has a discharge passage for opening a discharge port to the lower surface of the valve, and the base on which the switching valve is installed is connected in the direction in which the switching valve is connected. A discharge passage for connecting the discharge passage of the switching valve to the discharge passage, and a discharge flow of the discharge fluid in the discharge passage to the discharge passage to prevent backflow to the discharge passage. A check valve that closes the communication of the discharge ports of these switching valves with a closing member and is installed on the base.