JPS6323434B2 - - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION A. Object of the Invention (Field of Industrial Application) The present invention is a switching valve with a variable throttle used for controlling the operation of fluid pressure operated equipment. Specifically, a spool with closed parts at both ends and a crescent-shaped communication part in the center is moved and rotated using a single operating lever, and pressure fluid can be supplied with a controlled flow rate from either of the pair of inlet/outlet ports. This invention relates to a switching valve that enables

(Prior Art) Conventionally, a spool is fitted into a valve housing provided with ports for press-in and discharge of fluid and a pair of in-out ports.
A switching valve that alternately communicates both the fluid injection and discharge ports with a pair of inlet/outlet ports by moving the spool, in which the spool is rotatable to perform operations other than direction switching, includes: JP-A-46-84, JP-A-45-10857,
It is publicly known from various publications such as Utility Model Publication No. 36-25261,
In addition, by rotating the valve shaft within the cylindrical body equipped with a hot water passage hole and a cold water passage hole, the state of communication between the hot water passage hole and the cold water passage hole of the circular notch is changed, and the temperature of the mixture is adjusted. A regulating faucet for adjusting temperature, in which the valve stem is moved to perform functions other than temperature adjustment, is known from Japanese Utility Model Publication No. 36-25261.

(Problems to be Solved by the Invention) However, the switching valve disclosed in the above-mentioned Japanese Patent Application Laid-open No. 46-84 has a plug half the length of the annular chamber in the spool valve. When the plug corresponds to the motor inlet in the casing, turning the spool valve causes the fan-shaped plug to progressively cover the motor inlet and throttle the flow of fluid to the motor, but when the spool valve is moved in the opposite direction, Since the plug does not correspond to the motor gate, the gate is fully opened and the full flow is sent to the motor, and although the forward flow of fluid can be controlled, the reverse fluid flow cannot be controlled.

In addition, the switching valve described in Japanese Patent Publication No. 45-10875 is
A pair of pistons in the spool are provided with opposing recesses,
With the pair of pistons blocking the corresponding ports and cutting off communication between both ports, when the spool is turned and the recessed part corresponds to the port, the two ports communicate with each other and the fluid flowing out from the port is directed to the cylinder. Although it is possible to quickly return the piston using a small-capacity pump to allow the fluid to flow in, the function of adjusting the amount of pressure fluid sent out from the two ports cannot be achieved.

Furthermore, the adjustment faucet listed in Utility Model Publication No. 36-25261 is
When the hole in the valve stem communicates with the hot water hole and the cold water hole, the hole communicates with the drain port, and the flow rate of the waste water whose temperature has been adjusted by mixing hot water and cold water to one drain port. Even if it is possible to adjust and discharge the amount, it is not possible to alternately switch the supply to the two ports and adjust the supply amount for both ports.
The problem with the above three methods is that it is impossible to similarly adjust the flow velocity when feeding pressure fluid from either of the pair of ports by rotating the spool as the spool moves from side to side. The dot was hot.

The present invention was made in order to solve the above-mentioned problems of the conventional art. A spool with a crescent-shaped communication part that communicates one of the inlet and outlet ports with the press-fit port is attached to the middle of the operating lever by an operating shaft, and the fulcrum at the lower end of the operating lever can be moved freely to the arc-shaped guide. When the lever is operated in a direction perpendicular to the arc-shaped guide, the operating lever is raised and lowered to move the spool in the axial direction, and the crescent-shaped communication portion selectively opens the pair of inlet/outlet ports. When the flow path is switched by communicating with the press-fit port and the operating lever is operated in a direction parallel to the arcuate guide, the operating lever rotates and rotates the spool in the circumferential direction, causing the spool to connect to the port in the crescent-shaped communication section. In order to adjust the flow path area by changing the inclination, you can easily switch the reciprocating operation of fluid operating devices such as cylinders and motors, and adjust the reciprocating operating speed by operating a single operating lever. The purpose of the present invention is to provide a switching valve with a variable throttle that can be used for various purposes.

B. Structure of the invention (means for solving the problem) The means of the present invention for solving the above problem are as follows:
A valve housing 3 is provided with fluid inlet/outlet ports A and B between a central fluid press-in port P and discharge ports T and T at both ends, respectively, and a valve housing 3 that has fluid inlet/outlet ports A and B, respectively, and an axially movable valve inside the valve housing 3. Crescent-shaped communication that is freely rotatably fitted in the circumferential direction and connects the closed portions of the above-mentioned pair of inlet/outlet ports A and B at both ends and one of the pair of inlet/outlet ports to the press-fit port at the center. The spool 4 provided with the section 17 is pivoted at its intermediate section on the operating shaft 6 of the spool 4, and the fulcrum section 9 at the lower end is movably engaged with the arcuate guide 8, so that the spool 4 is at right angles to the arcuate guide 8. When operated in the direction, the spool 4 is raised and lowered around the fulcrum part 9 to move the spool 4 in the axial direction, and when operated in a direction parallel to the arcuate guide 8, the spool 4 is moved in the axial direction.
an operating lever 10 that rotates to move within the arcuate guide 8 and rotate the spool 4 in the circumferential direction;
The present invention resides in a configuration of a switching valve with a variable throttle, characterized by comprising:

(Function) The device of the present invention constructed as described above has the fulcrum portion 9 at the lower end supported by the arcuate guide 8, and is operated by standing upright above it as shown in FIGS. 1 and 6. When the lever 10 is operated in a direction perpendicular to the arcuate guide 8, for example to the left in FIG.
The operating lever 10 is tilted to the left around the fulcrum 9 at the lower end, and the spool 4, which has the operating shaft 6 connected to its intermediate part, is moved to the left and fluid is pressurized through the crescent-shaped communication part 17 provided at the center. Since the port P is made to communicate with the left inlet/outlet port A, when the operating lever 10 is operated parallel to the arcuate guide 9, for example to the left (the same applies to the right) in Fig. 6, the fulcrum at the lower end 9 moves to the right within the arc-shaped guide 8 and rotates the operating lever 10 to the left, so the spool 4 is rotated in the circumferential direction within the valve housing 3 and the flow path of the crescent-shaped communication portion 17 is rotated. The flow path is narrowed by changing the inclination of the control lever 1.
The pointer 19 attached to the pointer 0 moves, and the arc-shaped guide 8
Since the aperture status is displayed on the scale 19, when this display reaches the desired aperture value, the operation lever 10 is
If this is stopped, the fluid operating devices such as cylinders and motors connected to the inlet/outlet ports A and B will have the flow rate of fluid fed from port A throttled, and will therefore be fed at a low speed.

However, when the operating lever 10 is pulled to the right in FIG. P and the right entry/exit port B are communicated. Accordingly, when the operating lever 10 is rotated so as to return to the upright state shown in FIG.
8 rotates and the scale 19 indicates this state. If the operating lever 10 is stopped at this time, the fluid pressure operated devices such as cylinders and motors connected to the inlet/outlet ports A and B will not be connected to the port B. Because the fluid is fed without being throttled, the return is performed at a high speed, so the fluid pressure operated device allows slow feed and fast return operations to be performed by moving and rotating a single operating lever 10. This makes it easy and reliable.

Also, contrary to the above, if the flow rate of the fluid is increased when the fluid pressure operated device is sent and adjusted so that it is throttled when it returns, and the fluid is alternately fed to the inlet/outlet ports A and B, the fluid can be increased. The other inlet/outlet port B or A that is capable of rapid forwarding or slow reversing of pressure-operated equipment, and in either case does not communicate with the press-fit port P.
communicates with the discharge port T and discharges fluid in a non-restricted state, so it does not create resistance to the equipment.

Furthermore, if the speed of sending and returning the fluid pressure-operated device described above is inappropriate, the flow rate of the fluid can be adjusted as desired by rotating the spool 4 using the operating lever 10 and changing the inclination of the crescent-shaped communication portion 17. It is possible to obtain appropriate feeding and returning speeds at will, and if necessary, if the conditions of the feeding and returning throttles are kept constant, feeding and returning can be performed at a constant speed. Of course.

It should be noted that the movement and rotation of the spool 4 by operating the operating lever 10 does not necessarily have to be performed simultaneously as described above; first, the crescent-shaped communication portion 17 is
The same effect can be achieved even if the inclination of the port is adjusted and the aperture state is determined, and then a movement operation is performed to switch the communication of each port P, A, B, T, and T.

(Example) Hereinafter, an example of a switching valve with a variable throttle according to the present invention will be described based on the drawings.

In Figures 1, 4, and 5 of the drawings, reference numeral 3 denotes a valve housing, which has a hole 1 in its axial center into which a spool (to be described later) is fitted, and both ends of which are fitted with cover plates 2, 2. A press-fit port P for fluid is provided in the center of the length direction of the valve housing 3, and discharge ports T, T are provided at both ends. A pair of inlet/outlet ports A and B are provided in the middle of the hole 1, and a spool 4 having a portion at both ends that closes the pair of inlet/outlet ports A and B is fitted into the hole 1. Operating shafts 6, 6 passing through the sliding holes 5, 5 provided in the cover plates 2, 2 are arranged in series, and a fan-shaped plate is provided on one side of the lower part of the valve housing 3 as shown in FIG. 7, a groove-shaped arcuate guide 8 is provided on its upper surface, and a spherical fulcrum portion 9 provided at the lower end of the operating lever 10 is movably engaged with the arcuate guide 8.
One operating shaft 6 connected to the spool 4 described above is connected by a pin 11 in the middle of the spool 4, and the other operating shaft 6 is connected to the spool 4 when the spool 4 is in the neutral position.
A small ball 15 inserted into a hole 13 of a contact plate 12 attached to the lid body 2 is pushed by a spring 14 to form an annular groove 16 for positioning the spool 4, and the operating lever 10 is set at right angles to the arcuate guide 8. When operated in the direction, the operating lever 10 is raised and lowered around the fulcrum 9, moves the spool 4 in the axial direction, switches the flow path as shown in FIGS. 4 and 5, and moves the arcuate guide 8. When the fulcrum part 9 is moved in the arcuate guide 8 and the operating lever 10 is rotated in a direction parallel to The inclination of the crescent-shaped communication part 17, which is formed so that the part becomes deeper, is changed as shown in a, b, and c of FIG. 2 to ensure that the flow area is adjusted.

18 is the flow rate scale 1 displayed on the fan-shaped plate 7 described above.
9, the operating lever 10 is rotated using a pointer attached to the operating lever 10 to change the inclination of the crescent-shaped communicating portion 17 with respect to the flow path, and the scale 19 matches when the flow rate is throttled. , the flow rate of the fluid at that time is displayed.

C. Effects of the invention As mentioned above, the switching valve with variable throttle of the present invention has the following features:
The fulcrum at the lower end of the operating lever, which connects the operating shaft of the spool in the middle, is movably engaged with the arc-shaped guide, so if the operating lever is operated in a direction perpendicular to the arc-shaped guide, the operating lever will move. Raise and lower,
Switch the flow path by moving the spool in the axial direction, and move it in a direction parallel to the arcuate guide.The operating lever rotates and rotates the spool in the circumferential direction, creating a throttling effect by adjusting the flow path area. Because we do
By operating one operating lever, both flow path switching and throttle operation can be performed freely.

By moving the spool, fluid is alternately fed to the pair of fluid inlet/outlet ports, and the amount of feed is increased or decreased depending on the inclination of the crescent-shaped communication part, and cylinders, motors, etc., communicate with the pair of inlet/outlet ports. Not only can it easily and reliably perform operations such as slow feed, fast return, fast feed, and slow return on fluid pressure operated devices, but also
It is also possible to freely perform constant speed forwarding and returning.

If the fluid pressure operated equipment moves too slowly or too fast, the operating speed can be changed or set as desired by adjusting the rotation angle of the operating lever.

First, the spool is rotated by turning the control lever, and the crescent-shaped communication part sets the throttle state, and then the spool is moved by raising and lowering the control lever, and the flow path is switched. It is possible to control the speed of fluid pressure operated equipment without impact.

It has the following unique effects.

[Brief explanation of the drawing]

FIG. 1 is a longitudinal sectional side view showing an embodiment of a switching valve with a variable throttle according to the present invention. FIGS. 2a, 2b, and 2c are longitudinal sectional front views showing the constricted state of the flow path by the crescent-shaped communication portion of the spool in the same as above. Figure 3 is a symbol diagram of the same as above. FIGS. 5 and 5 are longitudinal sectional side views showing the switching state of the flow path by the crescent-shaped communication portion of the spool in the same as above. FIG. 6 is a front view of the same as above. 3...Valve housing, P...Fluid press-in port, A, B
...Pair of fluid in/out ports, T, T...Pair of fluid discharge ports, 4...Spool, 6...Operation shaft, 10...Operation lever, 17...Crescent-shaped communication portion, 8...Circle Arc-shaped guide, 9... fulcrum part.

Claims (1)

[Claims] 1. A valve housing with inlet/outlet ports provided between the central fluid press-in port and the discharge ports at both ends, and a valve housing that is fitted into the valve housing to freely move in the axial direction and rotate in the circumferential direction. A spool is provided with a crescent-shaped communication part at both ends that connects the closing parts of the pair of inlet/outlet ports to the press-fit port, and a crescent-shaped communication part at the center that communicates one of the pair of inlet/outlet ports to the press-fit port, and an intermediate part is attached to the operating shaft of this spool. When the fulcrum part at the lower end is movably engaged with the arc-shaped guide and the spool is operated in a direction perpendicular to the arc-shaped guide, the spool is raised and tilted around the fulcrum part to move the spool in the axial direction. and an operation lever that rotates the spool in a circumferential direction by rotating the fulcrum portion to move within the arcuate guide when the fulcrum portion is operated in a direction parallel to the arcuate guide. A switching valve with a variable throttle.