JPH0319662Y2 - - Google Patents

Description

[Detailed Description of the Invention] [Industrial Application Field] The present invention relates to a two-port air solenoid switching valve with a pressure reduction adjustment mechanism that can be used in a pneumatic circuit for operating actuators of air blowers, air drills, etc.

[Prior art]

In pneumatic circuits for operating actuators such as air blowers and air drills, a 2-port electromagnetic switching valve is installed in the pipeline connecting the pressure source and the actuator, as well as a pressure reducing valve. The air pressure is supplied to and stopped from the actuator, and the air pressure supplied to the actuator is adjusted by a pressure reducing valve.

[Problems to be solved by the invention] By the way, the above-mentioned electromagnetic switching valve and pressure reducing valve are independent, and in the pneumatic circuit, there is a space for mounting the electromagnetic switching valve and a space for mounting the pressure reducing valve. Not only does each valve require space for each valve, but each valve also needs to be individually connected in a conduit. In particular, when it is necessary to arrange a large number of actuators and each actuator must be provided with an electromagnetic switching valve and a pressure reducing valve, it is not only difficult to secure installation space for each valve, but also piping work. It takes a lot of time.

[Means for solving problems]

The present invention was made to address the above-mentioned problems, and provides a 2-port air solenoid switching valve with a pressure reduction adjustment mechanism (hereinafter simply referred to as a solenoid switching valve) that combines the functions of the above-mentioned 2-port electromagnetic switching valve and pressure reducing valve. A valve body is provided with an inlet and an outlet that communicate with each other through a valve seat having a valve hole, and a cover that is disposed opposite to the valve seat and is assembled to the valve body makes the outer peripheral edge airtight. a diaphragm which is sandwiched between the valve seat and forms a first chamber communicating with the inflow port on the valve seat side and a second chamber communicating with the first chamber through a throttle passage on the other side; a first poppet having a communication hole disposed and assembled to the diaphragm and communicating the second chamber and the valve hole; and a first poppet disposed opposite to the opening of the communication hole on the second chamber side and supported by a first spring. The second chamber side opening is closed and the first poppet is urged to be seated on the valve seat, and is moved against the action of the first spring by energizing a solenoid provided on one side. a valve plunger; and a cylinder having an inner hole coaxial with the valve hole, the cylinder being airtightly assembled to the valve body and having an inner end projecting into an outflow passage communicating the valve hole and the outlet. , the valve is assembled airtightly and slidably in the axial direction in the valve hole, and is biased toward the inner end of the cylinder by a second spring and in contact with the inner end of the cylinder. a second poppet that interrupts communication between the hole and the outlet; and a second poppet that is assembled in the inner hole of the cylinder so as to be airtight and slidable in the axial direction and that passes through the through hole at the inner end of the inner hole and connects the outlet to the outlet. A third spring that is adjustable from the outside forms a third chamber that communicates with the third chamber.
A piston is urged toward the chamber, and the piston is assembled airtightly and slidably in the axial direction in a through hole coaxial with the inner hole provided in the cylinder, and engages the second poppet at one end. The present invention is characterized in that it includes a rod that is engaged with the piston at the other end and transmits the movement of the piston to the second poppet.

[Effect of invention]

The electromagnetic switching valve according to the present invention is used by connecting its inlet to a pressure source and its outlet to an actuator such as an air blower or an air drill. If the valve plunger is biased by the first spring, the valve plunger is biased by the first spring.
The communication hole of the poppet is closed, the first poppet is seated on the valve seat, and the flow of air from the second chamber to the valve hole and from the first chamber to the second chamber is blocked. Air flow from the inlet to the outlet is blocked. Furthermore, at this time, the pressure in the first chamber that is applied from the pressure source through the inlet is also applied to the second chamber through the throttle passage, and the first poppet is also pressed against the valve seat by this pressure.

In the solenoid valve in such a state, when the solenoid is energized, the valve plunger is moved and the communication hole of the first poppet is opened, and at the same time air flows from the second chamber to the valve hole, air flows from the first chamber to the second chamber. Air flows through the throttle passage. Therefore, a pressure difference is created between the first chamber and the second chamber by the throttle passage, and the diaphragm moves toward the second chamber together with the first poppet, and the first poppet is separated from the valve seat and the first poppet is moved toward the first chamber. Air flows from the valve hole to the valve hole. Note that when air starts to flow from the first chamber to the valve hole in this way, the first
Although the pressure difference between the chamber and the second chamber is approximately zero, the first poppet is maintained apart from the valve seat by the flowing air.

At this time, if the second poppet is pushed through the rod by the piston that is urged toward the third chamber by the third spring and is separated from the inner end of the cylinder, the second poppet will be removed from the valve hole. Air flows to the outlet through the passage formed between the second poppet and the inner end of the cylinder, and the pressure of the air is applied to the third chamber through the cylinder's through hole, and the piston is moved between the pressure in the third chamber and the third spring. It will stop at a position where the force and the force applied from the rod are balanced. When the piston stops, the rod and the second poppet also stop, and the opening of the passage formed by the second poppet and the inner end of the cylinder is maintained. The pressure of the air flowing into the outlet in this state is the set pressure, and the air reduced to the set pressure flows from the outlet toward the actuator. Note that the set pressure can be adjusted by changing the force of the third spring through an external operation.

Furthermore, when the power supply to the solenoid is cut off in the state of outflow at the above-mentioned set pressure, the valve plunger is pushed by the first spring and moves.
The communication hole of the poppet is closed, and the diaphragm and the first poppet are pushed to seat the first poppet on the valve seat. Therefore, the flow of air from the first chamber to the valve hole is blocked, and the air pressure in the valve hole and the outlet gradually becomes atmospheric pressure. This pressure change (reduced pressure to atmospheric pressure) also occurs in the third chamber, and as the piston is pushed and moved toward the third chamber by the force of the third spring, the second poppet is also pushed through the rod. The passage formed by the second poppet and the inner end of the cylinder is fully opened.

[Effect of idea]

By the way, as is clear from the above explanation of the function, the electromagnetic switching valve of the present invention combines the functions of a conventional two-port electromagnetic switching valve and a pressure reducing valve in a single unit, so it does not require installation in the pneumatic circuit. Only one space is required, and the piping connection work can be halved compared to the conventional method.

Further, the electromagnetic switching valve of the present invention includes a valve body having an inlet and an outlet that communicate with each other via a valve seat having a valve hole, and a valve body disposed opposite to the valve seat. The outer periphery is airtightly sandwiched by the assembled cover, and a first chamber communicating with the inflow port is formed on the valve seat side, and a second chamber communicating with the first chamber through a throttle passage is formed on the other side. a diaphragm; a first poppet that is disposed so as to be seated on the valve seat and is assembled to the diaphragm and includes a communication hole that communicates the second chamber with the valve hole; and a first poppet that faces the opening of the communication hole on the first chamber side. The opening on the second chamber side is closed by a first spring, and the first poppet is biased to seat on the valve seat. Based on a known pilot-type two-port air solenoid switching valve that is equipped with a valve plunger that moves against the action of a spring, the valve body is slightly modified, and a member for obtaining the above-mentioned pressure reducing effect is provided. , that is, the second spring, the second
Since the valve body can be constructed by assembling a poppet, rod, cylinder, piston, third spring, etc. to the valve body, it can be manufactured compactly and at low cost.

〔Example〕

An embodiment of the present invention will be described below based on the drawings.

Figures 1 and 2 show a solenoid switching valve 1 according to the present invention.
0, in which the valve body 11 has a valve hole 11a, a valve seat 11b on which the first poppet 12 is seated and separated, and an inlet 11c and an outlet 11d that communicate with each other via the valve seat 11b. It is equipped with The first poppet 12 has a communication hole 12a in its axis, and a retainer 13 is used to connect the diaphragm 1.
4 through the diaphragm 14. The diaphragm 14 is airtightly held at its outer peripheral edge by the valve body 11 and a cover 16 attached to the upper side of the valve body 11 using bolts 15.
A first chamber R1 communicating with the inlet 11c is formed on the valve seat side, and a retainer 13 and a diaphragm 14 are formed on the other side.
The first chamber R is passed through the throttle passage S consisting of a hole provided in the
A second chamber R2 is formed which communicates with the second chamber R2.

Further, a valve plunger 17 and a solenoid 18 are assembled to the cover 16. The valve plunger 17 is arranged to face the upper end of the first poppet 12, and closes the second chamber side opening of the communication hole 12a of the first poppet 12 with a first spring 19, and pushes the first poppet 12 against the valve seat. 11b, and is configured to be moved (moved upward) against the action of the first spring 19 by energizing the solenoid 18.

On the other hand, a cylinder 20 is airtightly assembled to the lower side of the valve body 11 using bolts 21 and O-rings 22. The cylinder 20 has a second spring 2
3 and the second poppet 24, and its upper end is attached to the valve hole 11a.
It protrudes into an outflow passage that communicates with the outflow port 11d. Further, the cylinder 20 has an inner hole 20a coaxial with the valve hole 11a, and a piston 25 and a third spring 26 are installed in the inner hole 20a.

The second poppet 24 is formed into a cup shape and has a through hole 24a at the bottom, is assembled into the valve hole 11a airtightly and slidably in the axial direction, and is pushed downward by the second spring 23. The valve hole 11a is energized and is configured to block communication between the valve hole 11a and the outlet port 11d when it comes into contact with the upper end of the cylinder 20 as shown in the figure. Also, the second poppet 24
A rod 27 is fixed to the center of the bottom surface of the cylinder 20, and the rod 27 passes through a through hole 20b provided in the upper wall of the cylinder 20 in an airtight and slidable manner and comes into contact with the upper end of the piston 25. The movement is transmitted to the second poppet 24.

The piston 25 is assembled airtightly and slidably in the axial direction in the inner hole 20a of the cylinder 20, and has a third chamber R3 communicating with the outlet 11d through a through hole 20c at the upper end of the inner hole 20a. , and is biased upward by a third spring 26. Third spring 26
is interposed between the piston 25 and the retainer 28, and when the retainer 28 is moved upward by an adjustment screw 29, its resiliency is increased. The adjusting screw 29 is screwed into a cover 31 attached to the lower end of the cylinder 20 by bolts 30 so as to be able to move forward and backward, and can be rotated by a handle 33 when a lock nut 32 is loosened. Note that the chamber R4 in which the third spring 26 and the retainer 28 of the cylinder inner hole 20a are housed is always in communication with the outside through the gap between the adjustment screw 29 and the cover 31 and between the cylinder 20 and the cover 31, and is always kept at atmospheric pressure. It's starting to happen.

It should be noted that a pressure gauge indicated by reference numeral 34 in FIG. 2 is for displaying the pressure inside the outlet 11d, and is airtightly attached to the attachment hole 11e provided in the valve body 11.

The electromagnetic switching valve 10 configured as described above can be assembled by tightening the adjusting screw 29 in the illustrated state by a predetermined amount
The force of the spring 26 is increased to move the piston 25 upward from the position shown in the figure, and at the same time move the second poppet 24 upward against the second spring 23 via the rod 27 to create a space between the second poppet 24 and the upper end of the cylinder 20. It is used by fully opening the passage to be formed, connecting the inlet 11c to a pressure source, and connecting the outlet 11d to an actuator such as an air blower or an air drill.

If the solenoid 18 is de-energized when the electromagnetic switching valve 10 is in use, the valve plunger 17 is biased by the first spring 19 and closes the communication hole 12a of the first poppet 12. 1 poppet 12 is seated on the valve seat 11b, the flow of air from the second chamber R2 to the valve hole 11a and the flow of air from the first chamber R1 to the second chamber R2 are blocked, and at the same time, the flow of air from the inlet port 11c is blocked. Air flow to the outlet 11d is blocked.
Moreover, at this time, the pressure in the first chamber R1, which is applied from the pressure source through the inlet 11c, is also applied to the second chamber R2 through the throttle passage S,
Even with the same pressure, the first poppet 12 is pressed against the valve seat 11b.
pressed against.

In the electromagnetic switching valve 10 in such a state, when the solenoid 18 is energized, the valve plunger 17 is moved upward and the communication hole 12 of the first poppet 12 is moved upward.
a is opened and air flows from the second chamber R2 to the valve hole 11a, and at the same time air flows from the first chamber R1 to the second chamber R2 through the throttle passage S. Therefore, a pressure difference is generated between the first chamber R1 and the second chamber R2 due to the throttle passage S, and the diaphragm 14 moves toward the second chamber R2 together with the first poppet 12, and the first poppet 12 moves toward the valve seat. Air flows from the first chamber R1 to the valve hole 11a away from the valve hole 11b. Note that when air starts to flow from the first chamber R1 to the valve hole 11a in this way, the pressure difference between the first chamber R1 and the second chamber R2 becomes approximately zero, but the flowing air causes the first The poppet 12 is kept spaced apart from the valve seat 11b.

At this time, the second poppet 24 is pushed through the rod 27 by the piston 25, which is urged toward the third chamber R3 by the third spring 26, and is separated from the upper end of the cylinder 20. Air flows from the valve hole 11a to the outlet 11d through the passage formed between the second poppet 24 and the upper end of the cylinder 20, and the pressure of the air is applied to the third chamber R3 through the through hole 20c of the cylinder 20, and the piston 25 stops at a position where the pressure in the third chamber R3, the force of the third spring 26, and the force applied from the rod 27 are balanced. As the piston 25 stops, the rod 27 and the second poppet 24 also stop, and the second poppet 24 and the cylinder 20
The opening degree of the passage formed by the upper end of is maintained. The pressure of the air flowing into the outlet 11d in this state is the set pressure, and the air reduced to the set pressure flows from the outlet 11d toward an actuator (not shown). The above set pressure can be adjusted by loosening the lock nut 32 and adjusting the adjustment screw 2 with the handle 33.
The force of the third spring 26 can be adjusted by changing the force of the third spring 26 by an external operation such as by turning 9.

Furthermore, when the power supply to the solenoid 18 is cut off in the state of outflow at the above-mentioned set pressure, the valve plunger 17 is pushed by the first spring 19 and moves downward to open the communication hole 12a of the first poppet 12.
while closing the diaphragm 14 and the first poppet 12 to move the first poppet 12 to the valve seat 11.
sit on b. Therefore, the flow of air from the first chamber R1 to the valve hole 11a is blocked, and the air pressure in the valve hole 11a and the outlet 11d gradually becomes atmospheric pressure.
This pressure change (reduced pressure to atmospheric pressure) occurs in the third chamber R3.
This also occurs when the piston 25 is connected to the third spring 26.
The second poppet 24 is also pushed upward via the rod 27 and is formed by the second poppet 24 and the upper end of the cylinder 20. The passage is fully opened.

By the way, as is clear from the above description of the operation, this electromagnetic switching valve 10 has the functions of a conventional 2-port electromagnetic switching valve and a pressure reducing valve in a single unit, so it does not require installation in the pneumatic circuit. Only one space is required, and the piping connection work can be halved compared to the conventional method.

Further, this electromagnetic switching valve 10 has inlet ports 1 that communicate with each other via a valve seat 11b having a valve hole 11a.
A valve body 11 is provided with an inlet port 1c and an outlet port 11d, and an inlet port is provided on the valve seat side, the outer peripheral edge of which is airtightly sandwiched between the valve body 11 and a cover 13 that is assembled to the valve seat 11b and is disposed opposite to the valve seat 11b. A diaphragm 14 that forms a first chamber R1 that communicates with the valve seat 11c and a second chamber R2 that communicates with the first chamber R1 through a throttle passage S on the other side; The second chamber R2 is assembled into
and a first chamber R1 of the communication hole 12a.
A first spring 19 is disposed facing the side opening.
This closes the opening on the second chamber R2 side and urges the first poppet 12 to sit on the valve seat 11b, and resists the action of the first spring 19 by energizing the solenoid 18 provided on one side. Based on the well-known pilot type two-port air solenoid switching valve that is equipped with a valve plunger 17 that is moved by the valve body 11, slight machining (hole machining) is performed on the valve body 11, and
Members for obtaining the above-mentioned pressure reducing effect, namely the second spring 23, the second poppet 24, and the rod 2
7. Since it can also be constructed by assembling the cylinder 20, piston 25, third spring 26, etc. to the valve body 11, it can be manufactured compactly and at low cost.

[Brief explanation of the drawing]

FIG. 1 is a longitudinal sectional front view of the electromagnetic switching valve according to the present invention, and FIG. 2 is a partially cutaway side view taken along the line - in FIG. Explanation of symbols, 10... Solenoid switching valve, 11... Valve body, 11a... Valve hole, 11b... Valve seat, 11c
...Inflow port, 11d...Outflow port, 12...First poppet, 12a...Communication hole, 14...Diaphragm, 16...Cover, 17...Valve plunger, 18...Solenoid, 19...First Spring, 20...Cylinder, 20a...Inner hole, 20b
...Through hole, 20c...Through hole, 23...Second spring, 24...Second poppet, 25...Piston, 26...Third spring, 27...Rod,
S... Throttle passage, R1... First chamber, R2... Second
Room, R3...3rd room.

Claims (1)

[Scope of utility model registration request] A valve body is provided with an inlet and an outlet that communicate with each other through a valve seat having a valve hole, and a cover that is disposed opposite to the valve seat and is assembled to the valve body makes the outer peripheral edge airtight. a diaphragm which is sandwiched between the valve seat and forms a first chamber communicating with the inflow port on the valve seat side and a second chamber communicating with the first chamber through a throttle passage on the other side; a first poppet having a communication hole disposed and assembled to the diaphragm and communicating the second chamber and the valve hole; and a first poppet disposed opposite to the opening of the communication hole on the second chamber side and supported by a first spring. The second chamber side opening is closed and the first poppet is urged to be seated on the valve seat, and is moved against the action of the first spring by energizing a solenoid provided on one side. a valve plunger; and a cylinder having an inner hole coaxial with the valve hole, the cylinder being airtightly assembled to the valve body and having an inner end protruding into an outflow passage communicating the valve hole and the outlet. , the valve is assembled airtightly and slidably in the axial direction in the valve hole, and is biased toward the inner end of the cylinder by a second spring and in contact with the inner end of the cylinder. a second poppet that blocks communication between the hole and the outlet; and a second poppet that is assembled in the inner hole of the cylinder so as to be airtight and slidable in the axial direction and that passes through the through hole at the inner end of the inner hole and connects the outlet. A piston that forms a third chamber communicating with the third chamber and is biased toward the third chamber by a third spring that can be adjusted from the outside, and an airtight through hole coaxial with the inner hole provided in the cylinder. a rod that is slidably assembled in the axial direction and engages the second poppet at one end and the piston at the other end to transmit movement of the piston to the second poppet; A 2-port air solenoid switching valve with a pressure reduction adjustment mechanism.