JPS63235775A - Selector valve - Google Patents

Abstract

PURPOSE:To aim at improvement in sealing capacity as well as to prevent any lock due to friction between oval vanes, by inserting an oval ring into an interspace between an outer circumference of the oval vane and a cylinder inner surface. CONSTITUTION:A motor 11 is rotated and each minor axis of oval vanes 6 is set to a right angle with each axis of end connections 2a and 2b and the tip side of each major axis to the end connection 2b, respectively. Then the rear end side is set to a position of another end connection 2c. At this time, these end connections 2b and 2c as well as 2c and 2d are all interconnected with one another. Next, when a rod 5 is rotated as far as 180 deg. by the motor 11, these end connections 2a and 2c as well as 2d and 2b are all interconnected this time. During this action, circular vanes 7 are intercepted of leakage to be produced between the connecting pipe 2d and the outside by a circular ring 10 and that between connecting pipes 2a and 2d by an oval ring 9, respectively.

Description

DETAILED DESCRIPTION OF THE INVENTION Field of the Invention The present invention relates to switching valves for changing the direction of gas or liquid flow.

BACKGROUND OF THE INVENTION Conventionally, a three-way valve or a four-way valve has three or four connection ports perpendicular to the cylinder axis, and rotates a flat vane placed parallel to the cylinder axis. There was also a valve in which a plug was inserted to slide inside the cylinder, a flow path was provided at right angles within the plug, and the flow was switched by rotating the plug.

Problems to be Solved by the Invention However, in a valve with the above structure, the gap between the cylinder and the vane or plug has a large amount of rotational friction.
There was a limit to how small it could be. In particular, when high-temperature fluid flows, this gap must be made even wider, taking into account the difference in thermal expansion between the cylinder and the vane or plug. In many cases, the vanes and pistons were locked.

Also, if the gap was made larger, leakage would occur within the valve, causing fluids to mix.

Therefore, the present invention is designed to allow the flow path to be changed perfectly even when high-temperature gas is flowed through the valve, and to prevent the operation from stopping even if solid matter is contained in the fluid.

Means for solving the problem: A cylinder having a connection port perpendicularly opposed to the axis, and an elliptical vane sliding therein in contact with the connection port, the connection port being in the projected plane of the cylinder axis of the ellipse vane. The elliptical vane is provided so as to be rotated on the cylinder axis to switch the direction of communication with other connection ports located at the front and rear.

When the minor axis of the working elliptical vane is positioned parallel to the line connecting the opposing connection ports, for example, the two connection ports facing the same surface of the elliptical vane are communicated with each other. If the elliptical vane rotates 180 degrees from this position, other connection ports that have not been in communication will become in communication. When the valve assumes its respective position, the ring inserted around the outer circumference of the oval vane always slides in close contact with the inner wall of the cylinder.
The seal between the cylinder and the oval vane is very good.

Furthermore, even if thermal expansion occurs between the cylinder and the elliptical vane, the ring acts as a buffer and the elliptical vane will not lock due to friction.

Embodiment Hereinafter, one embodiment of the switching valve of the present invention will be described based on the accompanying drawings.

The figure is a longitudinal cross-sectional view of the switching valve, and 1 is a cylinder. One end of the cylinder 1 is open as a connection port 2a, and the other end is closed with a back cover 4 provided around a bearing 3. Two connection ports 2b and 2C are installed perpendicularly to the cylinder axis at a position of -3/3 of the total length from the connection port 2a of the cylinder 1, penetrating from the outside. A rod 5 is inserted into the cylinder 1 through a bearing 3 coaxially with the cylinder axis. An elliptical vane 6 (shaped by diagonally cutting the inner diameter of the cylinder 1) is fixedly attached to the tip of the rod 5. Further, a circular vane 7 is fixedly attached to the other end of the rod 5, at a position inside the cylinder of the back cover 4, with a space between the elliptical vane 6 and the circular vane 7. Oval vane 6
, the circular vanes 7 have grooves 8a and 8b dug in their outer peripheral surfaces, and an oval ring 9 and a circular ring 10 are inserted therein for sealing, respectively. A motor 11 is directly connected to the end of the rod 5 passing through the bearing 3. At a position between the elliptical vane 6 and the circular vane 7 of the cylinder 1, another connecting port 2d is provided to penetrate from the outside.

Next, the operation of the configuration of this embodiment will be explained. First, rotate the motor 11 so that the short axis of the elliptical vane 6 is perpendicular to the axes of the opposing cypress connections 2a and 2b, and the leading end of the long axis is placed at the connection port 2b, and the rear end is placed at the connection port 2c. do. At this time, the connection ports 2a and 2b, and 2c and 2d communicate with each other. Next, the rod 5 is rotated 180 degrees by the motor 11, and the tip of the long axis of the elliptical vane 6 is positioned on the connection port 2c side, and the rear end is positioned on the 2b side. Then, this time, connection ports 2a and 20.2d
and 2b communicate with each other. During this operation, the circular vane 7 prevents leakage between the connecting tube 2d and the outside with the circular ring 10. Further, the connection pipes 2a are separated by an oval ring 9.

As a result, from the connecting pipes 2a, 2d or 2b, 2c
The fluids flowing from 2b and 2 do not mix with each other.
c, or 2a, 2d (.In addition, when high-temperature gas flows, the cylinder 1 and the oval vane 6 are heated, but even if there is a difference in thermal expansion between them, the oval ring 9 and the circular ring 10, there is no stoppage of rotation due to increased friction.

Effects of the Invention The present invention is composed of a cylinder having three or four connection ports and an elliptical vane, and by inserting an elliptical ring between the outer peripheral surface of the elliptical vane and the inner surface of the cylinder, each This has the effect of completely switching the communication of the connection port. Furthermore, even if there is a difference in thermal expansion between the cylinder and the vane, the ring buffers the difference, resulting in smooth operation and a valve that can withstand high temperatures.

[Brief explanation of the drawing]

The figure is a longitudinal section of a switching valve according to an embodiment of the present invention. ■・・・Cylinder, 2 a + 2 b r 2 c
, 2 d... Connection port, 5... Rod, 6...
...Oval vane, 7...Circular vane, 9...
・Oval ring, 10... Circular ring, 11...
·motor.

Claims (3)

[Claims] (1) A cylinder, a rod that has the same axis as the cylinder, an elliptical vane fixed to the rod at a predetermined angle and inscribed in the cylinder, and an elliptical vane that has the same axis as the cylinder; A switching valve comprising two connection ports facing each other at right angles to the switching valve, and other connection ports provided at least before and after the two connection ports. (2) It is characterized by further comprising a circular vane fixed at right angles to the rod to which the oval vane is fixed, and a connection port is provided between the oval vane and the sliding inner surface of the cylinder of the circular vane. A switching valve according to claim 1. (3) Claim 1, characterized in that a groove is provided on the outer peripheral surface of the elliptical vane, and a sealing ring is inserted into the groove.
Switching valve as described in section.