JPH0142699Y2 - - Google Patents

Description

[Detailed Description of the Invention] (Industrial Field of Application) The present invention relates to a control valve, and more particularly to a switching valve with adjustable flow rate, and is used, for example, to control an air clutch.

(Prior Art and its Problems) Conventionally, there have been many directional control valves for switching pneumatic flow paths and flow rate adjustment valves for adjusting flow rate. In order to control the air clutch using these various valves, for example, the circuit configuration shown in FIG.
Normally, the half-clutch state is finely adjusted by using the check valve 4, and the check valve 4 is used to quickly disconnect the clutch. However, in the past, the switching valve 2, the flow rate adjustment valve 3, and the check valve 4 had to be connected to each other via piping, and their operation or adjustment had to be performed at multiple locations, which reduced work efficiency. There were problems with operability and maintenance.

Furthermore, control valves with a flow rate adjustment function and a switching function exist as proportional control valves or servo valves, but most of these use spools and have drawbacks in sealability and cost.

(Problems to be Solved by the Invention) The present invention aims to provide a control valve that has both a flow rate adjustment function and a switching function, is easy to operate, and is reliable.

(Means for solving the problems and their effects) The present invention has the following technical means to solve the above problems. That is, a cylindrical valve hole and a communication hole with a smaller diameter than the valve hole are provided coaxially in two steps in the main body of the control valve, and these steps serve as a valve seat. A poppet valve is constructed in which a valve body which is slidable in the valve hole and which is biased by a spring so as to be in constant contact with the valve seat is inserted to open and close between the valve hole and the communication hole. The valve body is provided with a throttle hole that opens toward the flow hole, and the flow hole is movable in the axial direction and is pressed against the valve body to open the poppet valve and to open the poppet. A plunger for closing the hole is provided, and the plunger is provided with a protruding needle that fits into the throttle hole, and the throttle hole, a portion of the valve hole near the valve seat, and the flow hole are connected to each other. , are connected to the outside of the main body independently of each other.

The axial movement of the plunger opens and closes the poppet valve and opens and closes the opening and closing between the throttle hole and the flow hole, thereby acting as a switching valve, and the needle between the throttle hole and the flow hole. It is then squeezed and acts as a flow regulating valve, and both of these functions are performed continuously by the axial movement of the plunger.

(Example) Hereinafter, the present invention will be described with reference to the following embodiments with reference to the drawings.

FIG. 1 shows a vertical cross-sectional view of the control valve 5, in which a substantially rectangular parallelepiped main body 6 has a cylindrical valve hole 7 and a valve hole 7.
A smaller diameter communication hole 8 is provided coaxially in two stages, and a valve body 9 that can be slid in the axial direction is fitted into the valve hole 7, and the main body 6 is inserted so as to close the valve hole 7.
A cover plate 10 is fixed to the end face of the cover plate 10 by bolts 11. Referring also to FIG. 2, the valve body 9 is provided with a small diameter portion 9a, and a compression spring 12 externally fitted to the small diameter portion 9a is inserted between the valve body 9 and the cover plate 10. As a result, the valve body 9 is urged rightward in FIG. The poppet valve 15 is adapted to come into contact with the valve seat 13, which is opened and closed, thereby forming a poppet valve 15 that opens and closes between the valve hole 7 and the communication hole 8.

Further, the valve body 9 is provided with a throttle hole 16 that opens toward the flow hole 8 side at its axial center, and this throttle hole 16 is formed into a groove formed on the circumferential surface of the valve body 9 by a through hole 17a. It is connected to 17. 18 is the concave groove 17
19 is a communication hole that communicates between the end of the valve hole 7 and the vicinity of the valve seat 13 and the outside, and 20 is a packing.

A plunger 21 is provided in the flow hole 8 and is movable in the axial direction and presses against the valve body 9 to open the poppet valve 15 and closes the throttle hole 16 by sealing with the gasket 14. ing.

The plunger 21 has a small-diameter cylindrical body portion 21a that slides inside a bush 22 fitted into the main body 6, a large-diameter cylindrical land portion 21b into which the compression spring 23 is externally fitted, and a hexagonal outer peripheral surface. A pressing part 21c that contacts the aforementioned gasket to press the valve body 9 and seal the throttle hole 16, and a tapered needle 21α that protrudes from the center of the end surface of the pressing part 21c and becomes smaller in diameter toward the tip. ,have. Pushing part 21
Since c has a hexagonal shape, its outer peripheral surface and the communication hole 8
There is a sufficient gap for compressed air to flow between the needle 21d and the needle 21d, which is inserted into the throttle hole 16 and is inversely proportional to the amount of insertion into the throttle hole 2.
The flow rate of air inside 0 increases and decreases.
The compression spring 23 is made stronger than the above-mentioned compression spring 12, so if no external force is applied, the entire needle 21d of the plunger 21 will fit into the throttle hole 16 and be pushed, as shown in FIG. The part 21c is in contact with the gasket 14, so that the throttle hole 20 is in a closed state, and the valve body 9 is separated from the valve seat 13 and in contact with the cover plate 10, so that the poppet valve 15 is in an open state.

A block 24 having a recess 24a is attached to one end of the main body 6 with a bolt 25, and one end of the body 21a of the plunger 21 penetrates a hole 24b and projects into this recess 24a. A long groove 27a provided at the lower end of the hand lever 27, which is pivotally supported by a pin 26 within the handle 24a, engages with a pin 28 that penetrates the body 21a in the diametrical direction. The plunger 21 is adapted to move in the axial direction by operation. Also, the compression spring 1 inside the flow hole 8 and the valve hole 7
The chamber 7a in which the valve body 2 is provided communicates with the chamber 7a through a through hole 29, so that the pressure balance due to the compressed air in the valve body 9 is maintained. 30 is the communication hole 8
This is a communication hole that communicates with the outside of the main body 6, and this and each of the above-mentioned communication holes 18, 19, and 30 are
It is guided to a piping port (not shown) provided on a sub-plate 31 attached to the sub-plate 31, allowing piping connection to external equipment.

In the control valve 5 configured as described above, when no external force is applied to the hand lever 27, the compression spring 23 causes the plunger 21 and the valve body 9 to be positioned at the left end side as shown in FIG. However, the poppet valve 15 is open and the throttle hole 16 is closed. Therefore, at this time, the communication hole 19 and the communication hole 3
Between 0 is a communication state. Next, hand lever 2
7 and rotate it to the left in the figure, the long groove 27
Due to the engagement between a and the pin 28, the plunger 21 moves to the right against the compression spring 23, and the valve body 9 moves to the right in the same way as the plunger 21 due to the extension force of the compression spring 12. do. When the valve body 9 comes into contact with the valve seat 13, the poppet valve 15 is closed, and the pressing portion 21c of the plunger 21
The seal 14 is separated and the seal here is released, and as the plunger 21 moves further to the right, the needle 21d comes out of the throttle hole 16, thereby gradually opening the throttle hole 16. It becomes familiar. Therefore, during this process, all the communication holes 18, 19, and 30 are cut off from each other at the moment when the valve body 9 comes into contact with the valve seat 13, and after that, the communication holes 18 and 30 are cut off from each other. gradually reach a state of complete communication.

In this way, by operating the hand lever 27, the communication hole 30 can be selectively switched to either of the communication holes 18, 19, and depending on the amount of operation of the hand lever 27, both the communication holes 18, 19, 30
It is possible to adjust the flow rate between. Therefore,
When this control valve 5 is used, the configuration of the control circuit is simple for controlling the air clutch, and the workability of piping connections etc. is very good, and the single hand lever 2
The air clutch can be switched on and off and the half-clutch state can be adjusted by only operating step 7, which provides good operability. Moreover, the valve structure for switching is a poppet valve type, which ensures reliable sealing and reduces failures.The structure of the control valve 5 is simple and does not require high-precision machining unlike servo valves, so manufacturing costs are reduced. never rises.

In the above embodiment, the compression spring 23 is made stronger than the compression spring 12, but these compression springs 1
By appropriately changing the strengths of 2 and 23, the communication state of the control valve 5 in a neutral state in which no external force is applied to the hand lever 27 can be changed. It is also possible to omit the compression spring 23. Although the pushing part 21c of the plunger 21 has a hexagonal outer peripheral surface, this shape may be any shape as long as it does not block the flow hole 8 and closes the throttle hole 16 by contacting the gasket 14. Any shape is fine.
For example, the shape may be square, octagonal, oval, circular with a diameter smaller than that of the communication hole 8, or a shape in which a groove, a hole, etc. for communication is provided in the pressing portion 21c. Patsukin 1
Although only a single member 4 serves as a seal for the valve seat 13 and the pressing portion 21c, separate seal members may be used for each. The flow rate change characteristic can be changed depending on the shape of the needle 21d, and it is also possible to change the operation amount of the hand lever 27 and the flow rate in direct proportion. The gasket 20 on the side of the small diameter portion 9a of the valve body 9 may be omitted. Instead of the hand lever 27, various operating methods such as a solenoid or pilot method may be used. Furthermore, the control valve of the present invention can also be used for hydraulic purposes.

(Effects) According to the present invention, it is possible to obtain a control valve that has both a flow rate adjustment function and a switching function, is easy to operate, and has reliable operation. Therefore, if this control valve is used to control the air clutch, etc., work efficiency and operability can be greatly improved.

[Brief explanation of the drawing]

Fig. 1 is a vertical sectional view of a control valve which is an embodiment of the present invention, and Fig. 2 shows the valve body and plunger of Fig. 1.
FIG. 3, which is a cross-sectional view taken along the line, is a conventional air clutch control circuit diagram. 5...Control valve, 6...Main body, 7...Valve hole, 8...
...Flow hole, 9...Valve body, 12...Compression spring, 13
... Valve seat, 15 ... Poppet valve, 16 ... Throttle hole, 21 ... Plunger, 21d ... Needle,
27...Hand lever.

Claims (1)

[Scope of Claim for Utility Model Registration] 1. A cylindrical valve hole and a communication hole with a smaller diameter than the valve hole are provided coaxially in two steps in the main body of the control valve, and these steps are used as a valve seat. A valve body is fitted into the valve hole and is biased by a spring so as to be able to slide within the valve hole and constantly contact the valve seat, thereby opening and closing the gap between the valve hole and the communication hole. The poppet valve is configured such that the valve body is provided with a restriction hole that opens toward the communication hole, and the throttle hole that is movable in the axial direction and that presses against the valve body is provided in the communication hole. A plunger is provided for opening the poppet valve and closing the throttle hole, and the plunger is provided with a protruding needle that fits into the throttle hole, and the plunger is connected to the throttle hole and a portion of the valve hole near the valve seat. and the communication hole are connected to the outside of the main body independently of each other. 2. The control valve according to claim 1, wherein the plunger is moved in the axial direction by rotational driving of a hand lever pivotally supported on the main body.