JPH10292873A - Multiport changeover valve - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a multiport changeover valve which can open plural ports simultaneously by a fluid differential pressure generated at the front side and the rear side of an orifice provided in the multiport changeover valve. SOLUTION: This valve is provided with a cylinder main body 11 having an output port 13 (14) and an exhaust port 15; a sliding valve 16 provided slidable in the cylinder main body 11, and to open and close the ports; and a restoring spring 21 to energize the sliding valve 16 to the initial condition. And the sliding valve 16 is provided with a first passage in the valve body, an orifice 18 in the passage, and it has a first port 19 at the upstream side of the orifice 18, and a second port 20 at the downstream side, and the sliding valve 16 is moved against the energizing force of the restoring spring 21 by the fluid differential pressure generated at the front side and the rear side of the orifice 18, and the communication of the second port 20 and the exhaust port is cut off, as well as the first passage is communicated to the output port through the first port 19.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a multi-port switching valve, and more particularly, to a plurality of ports which can be simultaneously opened and closed by a fluid pressure difference generated before and after an orifice provided in the multi-port switching valve. The present invention relates to a multi-port switching valve.

[0002]

2. Description of the Related Art Conventionally, as a multi-port switching valve, for example, one described in Utility Model Registration Publication No. 2517771 is well known. The switching valve has a solenoid, a hollow internal valve body integrally assembled with the solenoid, a spool slidably inserted into the valve main body, and one end functioning as a movable iron core in the solenoid. A rod connected to the plunger and having the other end protruding into the valve body and operatively connected to the spool, wherein the valve body has a first port on the fluid supply source side and a second port on the controlled part side. A port, a third port for discharging the return fluid from the controlled part, and a fourth port for discharging the staying fluid in the solenoid; A solenoid valve that is inserted into a periphery and connects the first to fourth ports to a flow path provided in a mounting member that opens corresponding to each port, wherein the fourth port is located between a spool and a solenoid. Let Both the communicating passage for communicating said fourth port and the third port in said valve body outer peripheral provided, is characterized in that the integration of the discharge channel of the mounting mating together.

[0003]

However, in the above device, the spool slidably inserted into the valve body is
A plunger that functions as a movable core in the solenoid is connected via a rod, and the spool is moved through the plunger as the movable core to switch the flow path, so that the stroke of the plunger that operates the spool is longer. And the overall length of the switching valve increases. In addition, since a long stroke is required, the thrust increases accordingly, the size of the solenoid increases, and power consumption increases.

Accordingly, the present invention provides a multi-port switching valve in which a flow path is formed in a slide valve, an orifice is provided in the flow path, and the slide valve is operated by a fluid pressure difference between before and after the orifice. As a means for generating a fluid pressure difference before and after the orifice, a solenoid valve as a general two-position switching valve is arranged in the flow path, and this solenoid valve is opened to allow the pressure fluid from the fluid pressure source to act on the orifice to switch between multiple ports. An object of the present invention is to solve the above-mentioned problem by enabling switching of a port of a valve.

In the present invention, since the sliding valve is operated by utilizing the fluid pressure difference generated before and after the orifice provided in the flow passage, it is not necessary to incorporate an electromagnetic valve in the multi-port switching valve, and the multi-port switching valve is not required. The configuration of the port switching valve is simplified, and further, the size and weight of the entire valve can be reduced. Further, as means for generating a fluid pressure difference before and after the orifice in the multi-port switching valve, a general solenoid valve is provided in a flow path connected to the multi-port switching valve, and the solenoid valve is opened and closed to open and close the multi-port switching valve. Since the supply of fluid to the orifice is interrupted by generating a fluid pressure difference, a special solenoid valve for switching valves is not required, and a significant cost reduction can be achieved.

[0006]

For this reason, the technical solution adopted by the present invention is to provide a cylinder body having an output port and a discharge port, and slidably disposed in the cylinder body to connect each of the ports. A sliding valve that can be opened and closed, and a return spring that urges the sliding valve to an initial state, wherein the sliding valve has a first flow path in a valve body and an orifice in the flow path; A first port is provided on the upstream side of the orifice, and a second port is provided on the downstream side. The sliding valve is moved against the urging force of the return spring by a fluid pressure difference generated before and after the orifice. A multi-port switching valve configured to connect a flow path to an output port via the first port and to cut off communication between a second port and a discharge port.

[0007]

DESCRIPTION OF THE PREFERRED EMBODIMENTS An embodiment of the present invention will be described below with reference to the drawings. FIG. 1 is a configuration diagram of an example in which a multi-port switching valve according to the present embodiment is incorporated in a fluid system.
FIG. 2 shows a non-operating state, and FIG. 2 is a configuration diagram of the multi-port valve in an operating state. In FIG. 1, 1 is a multi-port switching valve according to the present embodiment, 2 is a solenoid valve, 3 is an accumulator as a fluid pressure source, 4 is a fluid pump, and 5 is a reservoir, and these constitute one fluid circuit. ing. Note that the above circuit is an example, and it is obvious that a circuit that can use the multi-port switching valve according to the present invention can be used for various things such as a general fluid circuit and a brake system.

[0008] The multi-port switching valve 1 includes a cylinder 12 formed in a main body 11 and a first port communicating with the cylinder 12.
Output port 13, second output port 14, discharge port 15
And When the multi-port switching valve is in a non-operating state (in the state shown in FIG. 1), the first output port 13 and the second output port 14 are connected to a second valve formed on a sliding valve 16 described later.
The discharge port 15 is formed so as to be communicated with each other by a groove 17 as a flow path. The discharge port 15 will be described later when the multi-port switching valve is in a non-operating state (in a state shown in FIG. 1). Second port 20 formed in sliding valve 16
It is formed at a position where it can be communicated with.

A sliding valve 16 is slidably disposed in the cylinder 12 in the main body. The sliding valve 16 has a first flow path 22 formed in the center thereof. An orifice 18 is formed at the bottom. A first port 19 is formed in the flow path 22 on the upstream side of the orifice 18 in communication with the flow path, and a second port 20 is formed in the flow path 22a on the downstream side of the orifice in communication with the flow path. The groove 17 is formed on the outer periphery of the slide valve 16 as the above-described second flow path.

The sliding valve 16 is urged leftward in the figure by a return spring 21. In the initial position shown in FIG.
The first output port 13 and the second output port 14 formed in the main body 11 are in communication with each other by a groove 17 formed on the outer periphery of the sliding valve 16. The first output port 13 and the second output port 14 are connected to each other. The first flow path 22 of the valve train 16 is shut off. Further, the discharge port 1 formed on the body 11 side
5 is in communication with the second port 20 formed in the sliding valve 16. The solenoid valve 2 in the fluid circuit is configured as an A, B2 position switching valve, and when it is not operated, it takes the position A to shut off the flow path. Further, the fluid pump 4 is automatically activated when the sensor (not shown) detects that the fluid pressure of the accumulator 3 has been reduced, and can pressurize the accumulator 3.

Next, the operation of the multi-port switching valve having the above configuration will be described. In the non-operating state shown in FIG.
Since the flow path is shut off, no fluid pressure difference occurs around the orifice 18 in the multi-port switching valve 1.
At this time, the first output port 13 and the second output port 14
Are in communication with each other by a groove 17 formed on the outer periphery of the sliding valve 16, for example, by allowing the flow of a fluid in a fluid circuit (not shown) from the first output port 13 to the second output port 14 or vice versa. I have.

When the solenoid valve is switched to the position B by a command from an electronic control (not shown), the pressure fluid from the accumulator 3 flows into the multi-port switching valve 1, and flows before and after the orifice 18 in the sliding valve 16. Generates a pressure difference. When this fluid pressure difference becomes larger than the urging force of the return spring, the sliding valve 16 moves to the state shown in FIG. 2, and the first port 19 and the first output port 13 of the sliding valve communicate with each other so that the pressure fluid from the accumulator is removed. The first port 19 is supplied to the output port 13.

Further, with the movement of the slide valve 16, the second output port 14 and the first output port 13 on the main body 11 are shut off, and the discharge port 15 and the second port on the slide valve 16 are also shut off. Is done. In the present multi-port switching valve, the sliding valve moves in the left-right direction in the figure by the fluid pressure generated before and after the orifice and the urging force of the return spring. Is always higher than a certain pressure. Thus, by switching the solenoid valve 2, the multi-port switching valve can be switched simply by using the fluid pressure from the accumulator 3 to generate a fluid pressure difference before and after the orifice.

Next, second and third embodiments of the multi-port switching valve according to the present invention will be described. FIG. 3 shows an example in which one output port is formed on the main body side of the multi-port switching valve, and FIG. 4 shows an example in which three output ports are formed on the main body side. In both cases, switching the solenoid valve generates a fluid pressure difference before and after the orifice, enabling the flow path to be switched, making the configuration significantly larger than that of a conventional solenoid-integrated switch valve. It can be simplified.

Although the compression spring is used as the return spring in the above example, a tension spring can be used by changing the position of the spring. By changing the position of the groove formed in the sliding valve or the position of the output port formed in the main body, various types of multi-port switching valves can be configured. The multi-port switching valve according to the present invention can be used in various fluid circuits, and can be used for each purpose. A pressure fluid discharged directly from a pump can also be used as a fluid pressure source. Needless to say, the multi-port switching valve can be used for both liquid circuits and gas circuits. Furthermore, the present invention does not depart from the spirit or main features thereof.
It can be implemented in various other forms. for that reason,
The embodiments described above are merely examples in every respect and should not be construed as limiting.

[0016]

As described in detail above, according to the present invention,
Since the sliding valve is operated using the fluid pressure difference generated before and after the orifice provided in the multi-port switching valve,
There is no need to incorporate a solenoid valve in the multi-port switching valve,
The configuration of the multi-port switching valve can be simplified, and the size and weight of the entire valve can be reduced. Further, a general solenoid valve is provided in a flow path connected to the multi-port switching valve, and the solenoid valve is opened / closed so that the pressure fluid acts on the orifice in the multi-port switching valve. Since the port can be switched, a special solenoid valve for switching the valve as in the related art is not required, and the cost can be significantly reduced.Also, a small solenoid valve can be used, Excellent effects such as reduction in power consumption can be achieved.

[Brief description of the drawings]

FIG. 1 is a configuration diagram of an example in which a multi-port switching valve as an embodiment according to the present invention is incorporated in a fluid system;
It is a figure showing a non-operation state.

FIG. 2 is a configuration diagram of an operation state of the multi-port valve.

FIG. 3 is a sectional view of a multi-port switching valve as a second embodiment.

FIG. 4 is a sectional view of a multi-port switching valve as a third embodiment.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 Multi-port switching valve 2 Solenoid valve 3 Accumulator 4 Fluid pump 5 Reservoir 11 Main body 12 Cylinder 13 1st output port 14 2nd output port 15 Discharge port 16 Sliding valve 17 Groove 18 Orifice 19 1st port 20 2nd port 21 Return spring

Claims (3)

[Claims] An output port 13 (14) and a discharge port 1
And a sliding valve 1 slidably disposed in the cylinder body and capable of opening and closing the respective ports.
6 and a return spring 21 for urging the slide valve to an initial state. The slide valve 16 has a first flow path in a valve body and an orifice 18 in the flow path. Port 19 on the upstream side and second port 2 on the downstream side.
0, the sliding valve 16 is moved against the urging force of the return spring 21 by the fluid pressure difference generated before and after the orifice 18, and the first flow path is moved to the first port 19.
Through the second port 2
A multi-port switching valve configured to shut off communication between 0 and a discharge port. 2. An electromagnetic valve 2 for communicating and shutting off a flow path on the upstream side of the orifice is provided. By opening the electromagnetic valve, a fluid pressure difference is generated across the orifice 18 by fluid pressure from a fluid pressure source. The fluid pressure difference moves the slide valve 16 against the urging force of the return spring 21 to communicate the first flow path with the output port via the first port 19 and to cause the second port 20 And discharge port 15
2. The multi-port switching valve according to claim 1, wherein the communication with the valve is cut off. 3. A plurality of said output ports are formed on the cylinder side, and when the sliding valve is located in an initial state, each output port is communicated by a second flow path formed on the sliding valve side. When the sliding valve moves, the communication of each output port is cut off, and at least one output port communicates with the first flow path in the sliding valve via the first port. The multi-port switching valve according to claim 1, wherein the multi-port switching valve is configured.