JPS6212081Y2 - - Google Patents

Description

[Detailed description of the invention] For example, air pressure is applied to a piston slidably fitted in the cylinder of an actuator, and the movement of the piston caused by this pressure is controlled via a rod attached to the piston. Taking out work as a job is widely practiced.
In this case, the required output of the actuator is determined by the pressure required to stroke the piston to do work (generally pressure on the head side), and the pressure required to stroke the piston to return (pressure on the rod side) is the pressure required for return. The minimum pressure should be sufficient. However, in normal usage, after pressure control is performed, the same pressure is applied to both the head and rod sides using the directional control valve, so energy is wasted as return pressure on the rod side. This means that Conventionally, in order to prevent this wasteful energy consumption, a control circuit including a pressure control valve 27, a check valve 28, a flow rate adjustment valve 29, etc., as shown in FIG. 3, has been used. This method has the problem that the number of man-hours required for piping each device and the equipment are complicated and large, resulting in high initial costs.
Considering the benefits obtained from the reduction in energy consumption, it cannot be amortized, so it is not widely used. The purpose of this invention is to prevent energy loss as much as possible by adopting it in cases such as the above example, and to consolidate the functions of multiple devices into a single device. By arranging the operating parts for adjusting the pressure regulating valve and the flow rate regulating valve side by side on the same side of the body, it is possible not only when installed in a narrow space but also when installed under normal conditions. , the adjustment of each valve can be carried out very easily on the same side.

The basic structure of this device is that it functions as a check valve when supplying pressure to the cylinder, and when discharging the pressure inside the cylinder, adjusts the flow rate by adjusting the opening of the valve body. A pressure control valve that supplies air whose pressure is reduced according to the force generated by the pressure regulating spring when supplying pressure is arranged in parallel with the flow rate valve.

In Figures 1 and 2, 1 is a body, which includes an inlet 2 for primary pressure and an outlet 3 for secondary pressure.
and has.

A passage 4 and a second passage 4' are formed in the body 1 to communicate the inlet 2 and the outlet 3, and a pressure control device includes a valve body 5 that opens and closes the passage 4 from the outlet 3 side. This valve body 5 of the valve 6 has
One end of the rod 7 is engaged, and the valve body 5 is seated on a valve seat 8 formed in the passage 4.

said rod 7 extends through said passage 4;
The other end of the rod 7 projects into a cylindrical chamber 9 and is engaged with a piston 11 which slides airtightly on the inner wall 10 of this chamber 9 with a packing 31. One end of a pressure regulating spring 12 is engaged with this piston 11, and the other end of this pressure regulating spring 12 is engaged with a pressure regulating member 13 and screwed into an internal thread 14 formed on the inner wall of the body 1. A groove 16 as an operating section formed on the end surface of the pressure regulating member 13 having the threaded section 15
By fitting and rotating the tip of the driver against the valve body, the force generated by the pressure regulating spring 12 acting on the valve body 5 via the piston 11 and the rod 7 is changed, and the pressure regulating spring 12 is changed. The force generated by the spring 12 mainly opposes the pressure on the outlet 3 side of the valve body 5, so that the pressure can be reduced when air flows in from the inlet 2. Note that the spring 32 inside the valve body 5
is for applying and returning the seat force to the valve body 5. In addition, the valve seat 8 and the inner wall 10 in the cylindrical chamber 9
Since the seal diameter is the same, the structure is unaffected by changes in the inlet side pressure.

Next, a second passage 4' arranged in parallel with the passage 4 is provided with a flow rate regulating valve 17 that can adjust the opening degree of this passage 4'.
a valve seat 18 formed in the second passage 4';
A valve body 19 sitting on this valve seat 18 and this valve body 1
Stem 21 inserted into insertion hole 20 formed in 9
The stem 21 is extended with an O-ring 33 to maintain airtightness, and the threaded cylinder 24 has a threaded thread 22 at its distal end, and has an internal thread 23 that engages with the threaded thread 22. It is screwed into an internal thread 25 provided in the body 1. A groove 26 as an operating part is formed on the end surface of the stem 21 screwed into the threaded cylinder 24, and the tip of a driver is fitted into this groove 26 and rotated to move the stem 21 forward. The distance between the end face of the insertion hole 20 of the valve body 19 and the end face of the stem 21 is adjusted, and the valve seat 1
The opening degree of this valve body 19 with respect to 8 is adjusted.

The pressure control valve with flow rate adjustment valve having the above configuration is schematically shown as 30 in Fig. 4, and its inlet 2
When the primary side pressure is supplied into the body 1, the valve element 19 of the flow rate regulating valve 17 is seated on the valve seat 18, and the flow of air is cut off, passing through the pressure control valve 6 side and flowing to the outlet 3 side. Air flows. As long as the secondary pressure on the outlet 3 side is below the pressure that counteracts and balances the force generated by the pressure regulating spring 12, air will flow to the outlet 3 through the gap between the open valve body 5 and the valve seat 8. When the pressure reaches a pressure that counters and balances the force generated by the pressure regulating spring 12, the valve body 5 is forced onto the valve seat 8 via the piston 11, the fluid flow is cut off, and the pressure at the outlet 3 is reduced. becomes the pressure set by the force of the predetermined pressure regulating spring 12.

When fluid flows from the outlet 3 to the inlet 2, the pressure on the outlet 3 side is the pressure of the air pressure source directly supplied to the supply side of the cylinder, and the pressure is compressed and increased through the piston of the cylinder. Therefore, the valve body 5 of the pressure control valve 6 remains seated on the valve seat 8, and the flow rate adjustment which is throttled to a predetermined opening degree passes through the second passage 4' without passing through the pressure control valve 6. Flow occurs through the gap between the valve body 19 of the valve 17 and the valve seat 18, allowing meter-out control of the cylinder.

In this way, according to the configuration of this invention, flow rate adjustment,
By consolidating functions such as pressure control into a single device, it is small, lightweight, and inexpensive, making it possible to easily implement energy-saving measures, which is extremely useful in practice.

[Brief explanation of the drawing]

In the figure, Fig. 1 is a vertical sectional view of an embodiment of this invention, Fig. 2 is a plan view thereof, Fig. 3 is a diagram showing an embodiment of a conventional circuit, and Fig. 4 is a flow rate adjustment of this invention. It is a figure which shows the Example at the time of using the pressure control valve with a valve. In the diagram, 1...body, 2...entrance, 3...
Exit, 4... passage, 4'... second passage, 5...
Valve body, 6... Pressure control valve, 7... Rod, 12...
...Pressure regulating spring, 13... Pressure regulating member, 16... Groove (operation part), 17... Flow rate regulating valve, 19... Valve body, 2
4...threaded cylinder, 26... groove (operating section).

Claims (1)

[Scope of utility model registration request] A rod is formed in a body having an inlet for primary pressure and an outlet for secondary pressure, and has one end engaged with a valve body that forms a passage that communicates these inlets and outlets, and opens and closes this passage from the outlet. is extended, and the other end is engaged with a piston that slides airtightly along an inner wall of a cylindrical cavity communicating with the passage inlet side,
A pressure regulating spring that opposes the outlet side pressure of the valve body and opens the valve body is engaged with the piston, and a pressure regulating member that adjusts the strength of the pressure regulating spring is adjustable from the outside, and the pressure from the inlet is adjusted. It has a pressure control valve that reduces the pressure to a predetermined pressure during air circulation, and on the inlet side of the passage, a second passage branched from the passage has a valve body that opens and closes this passage from the inlet. A stem is provided that is loosely connected to the valve body, and this stem can be operated from the outside to adjust the valve body to a predetermined opening degree.When air flows from the inlet, it acts as a check valve when air flows from the outlet. A pressure control valve with a flow rate adjustment valve used in a meter-out circuit consisting of a flow rate adjustment valve that acts as a throttle valve.