JPH0243066B2 - - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION A. Object of the invention (industrial field of application) The present invention is a switching valve with a variable throttle for use in fluid pressure operated equipment. More specifically, the present invention relates to a switching valve with a restrictor that can discharge fluid at a controlled flow rate from either of a pair of discharge ports by moving and rotating crescent-shaped communication portions provided at both ends of the spool.

(Prior Art) Conventionally, a spool is fitted into a valve housing provided with a port for press-in and discharge of fluid and a pair of in-out ports, and both the ports for press-in and discharge of fluid are alternately connected by moving the spool. In a switching valve that communicates with a pair of inlet and outlet ports, the spool is rotatable;
Switching valves that perform operations other than direction switching are known from Japanese Patent Application Laid-Open No. 46-84, Japanese Patent Publication No. 10857-1982, Japanese Utility Model Publication No. 25261-1973, etc.
The temperature of the mixture is adjusted by rotating the valve stem within the cylinder that has a hot water hole and a cold water hole to change the state of communication between the hot water hole and the cold water hole in the circular notch. A regulating faucet 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 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 transferred from the port. Even if it is possible to quickly return the piston using a small-capacity pump to allow the fluid to flow into the cylinder, 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 the pressure fluid is delivered from either of the pair of ports by rotating the spool as the spool moves left and right. It was hot.

The present invention has been made to solve the above-mentioned conventional problems, and is fitted into the valve housing so as to be movable and rotatable, and in the neutral position, the pair of inlet/outlet ports are closed by the closing portion, and the left When moved to the right, one of the pair of inlet/output ports is connected to the press-in port by the central communication part, and the other inlet/outlet port is connected to the discharge port by one of the crescent-shaped communication parts at both ends. By pivoting the middle of the lever and movably engaging the fulcrum at the lower end of the lever with an arc-shaped guide, when the lever is turned in one direction, the spool moves in that direction, and the spool moves in that direction. One of the inlet/output ports is communicated with the press-fit port by the communicating part, and one of the crescent-shaped communicating parts at both ends communicates the other inlet/outlet port with the discharge port, and the spool rotates to communicate with the discharge port of the crescent-shaped communicating part. When the lever is moved in the opposite direction and turned, the intermediate communication section connects the other inlet/outlet port to the press-in port. death,
When the other of the crescent-shaped communication parts at both ends communicates one inlet/output port with the discharge port, the correspondence between the crescent-shaped communication part and the port can be changed, and the fluid flow area can be adjusted. , the purpose of providing a new switching valve with a variable throttle that allows switching of the reciprocating operation of a fluid operating device such as a motor and adjusting the operating speed of both reciprocating operations can be freely and easily performed by operating a single lever. It is something that will be done.

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/output ports A and B, respectively, between a central fluid press-in port P and fluid discharge ports T and T at both ends, and a valve housing 3 that is movable and rotatable within the valve housing 3. When fitted, the pair of inlet/outlet ports A and B are closed by the closing part in the neutral position,
When moved to the left or right, one of the pair of inlet/outlet ports A and B is connected to the press-fit port P by the central communication portion 17'.
The spool 4 has a crescent-shaped communication portion 17 at both ends that connects the other inlet/outlet port to the discharge port T, and the spool 4 is pivoted at its middle to the operating shaft 6, and the fulcrum portion 9 at the lower end is connected to the ejection port T. The spool 4 is movably engaged with the arcuate guide 8, and the spool 4 is moved left and right by a tilting operation centered on the fulcrum portion 9, and the crescent-shaped communication portion is moved from side to side by rotation about the operating shaft 6. 17, 17 discharge port T, T
The present invention consists in the configuration of a switching valve with a variable throttle, characterized in that it is equipped with a lever 10 that changes the state of response.

(Function) In the device of the present invention constructed as described above, the lever 10 in the upright state is tilted to the left in FIG. While moving the lever 10 to the right ( When the pointer 18 is turned until it matches the desired scale 19 (same for the left side), the left inlet/outlet port A and the press-in port P are communicated with each other through the communication part 17', and pressurized fluid is supplied at the same time. When the right inlet/outlet port B and the right outlet port T communicate with each other to discharge fluid, the crescent communication part 17 tilts and narrows the flow path, so it is connected to the inlet/outlet ports A and B. Fluid pressure operated devices such as cylinders and motors have a reduced flow rate of discharged fluid and are sent at a low speed.

However, when lever 10 is pushed to the right, spool 4
is connected to the fluid press-in port P by the intermediate communication portion 17'.
While moving the lever 10 to the left ( Same for the left side) Pointer 1
8 until it matches the maximum scale 19, the right inlet/outlet port A and the press-in port P are communicated through the communication part 17', and pressurized fluid is supplied, and at the same time, the left inlet/outlet port B and When the left discharge port T communicates with the fluid to be discharged, the crescent-shaped communication portion 17 returns to the horizontal position and widens the flow path. In this fluid pressure operated device, the flow rate of discharged fluid is increased and the fluid is returned at a high speed. obtain.

Also, contrary to the above, if the flow rate of the fluid is increased when the actuator is sent and adjusted so that it is throttled when it returns, and the fluid is alternately fed to the inlet and outlet ports A and B, the speed of the actuator can be increased. It is capable of forwarding and slow return, and in either case, if the speed of forwarding or returning is inappropriate, turn the spool 4 with the lever 10 to adjust the inclination of the crescent-shaped communicating portion 17, i.e. By changing the correspondence state with the discharge port T, it is possible to adjust the flow rate of the fluid at will to obtain an appropriate feeding and return speed, and furthermore, it is possible to adjust the throttle condition in feeding and returning. Of course, by keeping constant, it is possible to perform feeding and returning at a constant speed.

Note that the movement and rotation of the spool 4 by operating the lever 10 do not necessarily have to be performed simultaneously as described above; first, the inclination of the crescent-shaped communication portion 17 is adjusted by rotation, and the movement operation is performed after determining the aperture state. Therefore, even if the ports P, A, B, T, and T are switched for communication, the same effect as described above can be achieved.

(Example) Examples of the switching valve with variable throttle of the present invention will be described below based on the drawings.

1, 4, and 5 of the drawings, reference numeral 3 designates 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 connected by cover plates 2, 2. A fluid press-in port P is provided in the center of the length direction of the valve housing 3, and fluid discharge ports T, T are provided at both ends.
and the press-fit port P are provided with fluid inlet/outlet ports A and B, respectively, and the hole 1 has a
An annular communication part 17' is provided in the center and a pair of crescent-shaped communication parts 17, 17 are provided at both ends.
An operation in which a spool 4 that closes a pair of inlet/outlet ports A and B is fitted into the intermediate portion between 17 and 17', and the sliding holes 5 and 5 provided in the cover plates 2 and 2 are passed through both ends of the spool 4. The shafts 6, 6 are arranged in series, and one operating shaft 6 has a groove-shaped circle formed on the upper surface of a fan-shaped plate 7 that protrudes from the lower part of the valve housing 3 to one side, as shown in FIG. A ball 9 at the lower end that serves as a fulcrum to the arcuate guide 8
The middle part of the operating lever 10 that is movably engaged is fixed with a pin 11, and the other operating shaft 6 is provided with a hole 13 of a stop plate 12 attached to the lid body 2 when the spool 4 is in the neutral position. The spool 4
An annular groove 16 is formed to position the spool, and when the lever 10 is raised and lowered, the spool moves,
When the switching is performed as shown in FIGS. 4 and 5 and rotated, the inclination of the crescent-shaped communicating portion 17 changes as shown in FIGS. This is to ensure that this is done.

Reference numeral 18 indicates a pointer attached to the lever 10 in correspondence with the flow rate scale 19 displayed on the fan-shaped plate 7, which matches when the lever 10 is rotated to throttle the flow rate through the crescent-shaped communication portion 17. Scale 19
Accordingly, 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:
When you turn one lever while moving it to one side or the other, fluid is alternately supplied from the fluid press-in port to the pair of fluid in/out ports, and the amount of fluid discharged from the discharge port is adjusted to the three-way communication section. By increasing and decreasing the flow rate, it is possible not only to easily and reliably perform operations such as slow feed, quick return, fast feed, slow return, etc. of fluid pressure operated devices such as cylinders and motors that communicate with a pair of inlet and output ports. You can also freely forward and return at high speeds.

When the movement of the operating device is too slow or too fast, the operating speed can be changed or set as desired by adjusting the rotation angle of the lever.

In addition, by first rotating the spool by operating a lever and setting the throttling state by the crescent-shaped communication portion, the spool can be moved to perform speed regulation and switching 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. 2a, b, and c of FIG. 2 are longitudinal sectional front views showing the constricted state of the crescent-shaped communication portion in the same as above. Figure 3 is a symbol diagram of the same as above. FIG. 4 and FIG. 5 are vertical side views showing the switching state of the same as above.
FIG. 6 is a front view of the same as above. 3...Valve housing, P...Fluid pressure fitting port, A, B...
...Pair of fluid in/out ports, T, T...Pair of fluid discharge ports, 4...Spool, 6...Operation shaft, 1
0... Lever, 17, 17... Crescent-shaped communication part,
17'...Central communication part, 8...Circular guide,
9...Fulcrum part.

Claims (1)

[Claims] 1. A valve housing having a fluid inlet/outlet port between a fluid press-in port in the center and a fluid discharge port at both ends, and a valve housing that is fitted into the valve housing so as to be movable and rotatable, and in a neutral position. When the aforementioned pair of inlet/outlet ports are closed by the closing part and moved to the left or right, one of the pair of inlet/outlet ports is communicated with the press-fit port by the central communicating part, and the other is connected by one of the crescent-shaped communicating parts at both ends. A spool that connects the port to the discharge port is attached at the middle to the operating shaft of this spool, and the fulcrum part at the lower end is movably engaged with the arcuate guide, and by a tilting operation centered on the fulcrum part. , a switching valve with a variable throttle, comprising a lever that moves the spool left and right and changes the correspondence state of the crescent-shaped communication portion to the discharge port by rotating around the operating shaft. .