JP2006099222A - Air regulator - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To prevent the operation from becoming unstable while exhaust pressure is applied to the floating piston, in the air regulator which is provided with a primary pressure inlet, a secondary pressure take-out port, the main valve opening and closing a part between the primary pressure inlet and the secondary pressure take-out port and the floating piston opening/closing the main valve in accordance with pressure fluctuation of the secondary pressure take-out port and a pilot pressure room, whereinthe main valve integrally has the exhaust valve part facing the floating piston, the floating piston integrally has the valve seat part which is attached to/detached from the exhaust valve part in accordance with a position of the floating piston, and the secondary pressure take-out port is communicated with atmosphere when the valve seat part is detached from the exhaust valve part. <P>SOLUTION: The air regulator is provided with an umbrella-like part for receiving exhaust air passing a gap between an exhaust valve part and a valve seat part and preventing the exhaust air from directly being applied to a floating piston, integrally with the exhaust valve part of a main valve. <P>COPYRIGHT: (C)2006,JPO&NCIPI

Description

  The present invention relates to an air regulator that extracts a high primary pressure as a stable low extraction secondary pressure.

  Conventionally, as an air regulator, the primary pressure inlet, the secondary pressure inlet, the main valve that opens and closes between the primary pressure inlet and the secondary pressure outlet, and moves according to the pressure fluctuation of the secondary pressure outlet and the pilot pressure chamber A device having a floating piston that opens and closes a main valve is known.

  In this air regulator, the main valve has an exhaust valve portion that faces the floating piston in an integrated manner, and the floating piston has an integrated valve seat portion that changes the distance from the exhaust valve portion according to the position of the floating piston. Is provided. The main valve always opens the flow path between the primary pressure inlet and the secondary pressure extraction chamber slightly to flow the bleed flow, and when the pressure at the secondary pressure outlet is below a predetermined value, the valve seat becomes the exhaust valve. Sitting. When the pressure at the secondary pressure outlet becomes higher than that of the balanced pilot pressure chamber, the floating piston moves and the valve seat part moves away from the exhaust valve part, and the secondary pressure outlet is communicated with the atmosphere to exhaust (second Reduce the pressure at the next pressure outlet). On the other hand, when the pressure at the secondary pressure outlet decreases from the balanced state, the floating piston moves toward the exhaust valve and moves the main valve in the valve opening direction via the valve seat, so the secondary pressure from the primary pressure inlet The flow rate flowing to the pressure outlet increases, and as a result, the pressure at the secondary pressure outlet increases. As a result of the above operation being performed according to the pressure fluctuation at the secondary pressure outlet, the secondary pressure taken out can be kept substantially constant.

  In this air regulator, it has been pointed out that when the valve seat part of the floating piston is separated from the exhaust valve part of the main valve, the floating piston becomes unstable and the extraction pressure becomes unstable.

  An object of the present invention is to obtain an air regulator with a stable take-off pressure, in which the exhaust pressure hardly acts on the floating piston during exhaust (the action of the exhaust pressure can be suppressed).

  In the present invention, the unstable phenomenon at the time of exhaust in which the valve seat portion of the floating piston is separated from the exhaust valve portion of the main valve is caused by the exhaust pressure acting on the floating piston being excessively displaced. Based on this hypothesis, the instability phenomenon at the time of exhaust can be prevented if this exhaust pressure is not applied to the floating piston.

  The present invention includes a primary pressure inlet; a secondary pressure outlet; a main valve that opens and closes between the primary pressure inlet and the secondary pressure outlet; and the above according to the pressure fluctuations of the secondary pressure outlet and the pilot pressure chamber. A floating piston that opens and closes the main valve; the main valve integrally includes an exhaust valve portion that faces the floating piston, and the floating piston has a valve seat portion that contacts and separates from the exhaust valve portion according to the position of the floating piston. In an air regulator that has a single body and communicates the secondary pressure outlet to the atmosphere when the valve seat part is separated from the exhaust valve part, the exhaust valve part and the valve seat part are integrated with the exhaust valve part of the main valve. It is characterized in that an umbrella-shaped portion that receives the exhaust gas passing through the gap and prevents the exhaust gas from directly acting on the floating piston is provided.

  As the umbrella-shaped portion, for example, a type in which the surface on the exhaust valve portion side is a flat surface can be used. For example, a type in which the surface on the exhaust valve portion side is a concave surface can also be used.

  In this air regulator, in order to adjust the take-out secondary pressure, a nozzle passage for communicating the pilot pressure chamber with the atmosphere; an opening gap control plate located at the opening end of the nozzle passage; And a take-out pressure adjusting means for changing the distance from the open end of the nozzle passage. More specifically, the opening interval control plate is composed of an elastically deformable circular leaf spring having a fixed peripheral edge, and the take-out pressure adjusting means includes a concentric coil provided on the circular leaf spring, It can be set as the electromagnetic drive device which consists of a fixed permanent magnet located in the center of this coil.

  According to the present invention, it is possible to obtain an air regulator with a stable take-out pressure, in which the exhaust pressure hardly acts on the floating piston during exhaust (the action of the exhaust pressure can be suppressed).

  FIG. 1 shows the overall structure of an electropneumatic conversion air regulator 10 to which the present invention is applied. The housing 11 includes a lower housing 11a, a middle housing 11b, a first upper housing 11c, a second upper housing 11d, and a cap body 11e in order from the bottom of FIG.

  A primary pressure inlet 12 and a secondary pressure outlet 13 are open in the lower housing 11a. The primary pressure inlet 12 and the secondary pressure outlet 13 communicate with each other through a passage 14, and the passage 14 is opened and closed by a main valve 15. The main valve 15 always closes the passage 14 by the force of the compression spring 16. In the lower housing 11a, a secondary pressure outlet chamber 17 communicating with the secondary pressure outlet 13 and the passage 14 is formed.

  The peripheral portions of the pilot diaphragm 21 and the control diaphragm 22 of the floating piston 20 are airtightly sandwiched between the first upper housing 11c and the middle housing 11b and between the middle housing 11b and the lower housing 11a, respectively. The floating piston 20 has a relief chamber 23 between a pilot diaphragm 21 and a control diaphragm 22, and an exhaust valve block (seat) 24 in the center. The exhaust valve block 24 is formed with a communication hole 25 that allows the take-out chamber 17 and the relief chamber 23 to communicate with each other. The relief chamber 23 communicates with the atmosphere through an atmospheric communication hole 26 formed in the middle housing 11b and the lower housing 11a. is doing. The floating piston 20 defines the secondary pressure extraction chamber 17 described above in the lower housing 11a.

  The communication hole 25 includes a shaft portion passage 25a and a radial passage 25b, and the shaft portion passage 25a is opened and closed by an exhaust valve portion (relief valve portion) 18 provided coaxially and integrally with the main valve 15. That is, the exhaust valve portion 18 is provided at the upper extension end of the main valve 15 and has a hemispherical shape. The exhaust valve portion 18 opens and closes the communication hole 25 by making contact with and separating from the annular valve seat portion 25c concentric with the shaft passage 25a. . When the exhaust valve portion 18 closes the communication hole 25, the air in the extraction chamber 17 does not flow into the relief chamber 23, and the relative position between the main valve 15 (exhaust valve portion 18) and the floating piston 20 is separated. When the exhaust valve portion 18 is separated from the annular valve seat portion 25c, the shaft passage 25a is opened, and the air in the take-out chamber 17 is released to the atmosphere through the communication hole 25, the relief chamber 23, and the atmosphere communication hole 26. (Relieved).

  The floating piston 20 has a compression coil spring 27 inserted between the first upper housing 11c and the floating piston 20 so that the communication hole 25 (annular valve seat portion 25c) in the lower portion of FIG. It is urged to move so as to abut on the portion 18 and close the relief passage.

  An umbrella-like portion 19 made of an elastic material such as hard rubber or a metal material is integrally fixed to the top of the exhaust valve portion 18. The umbrella-shaped portion 19 has a shaft portion 19a extending on the same axis as the main valve 15 and the exhaust valve portion 18, and an umbrella portion 19b extending in the radial direction from the upper end portion of the shaft portion 19a. Located in. The umbrella portion 19b has substantially the same diameter as the shaft portion passage 25a (the smallest diameter portion thereof), and the exhaust gas exhausted through the gap between the exhaust valve portion 18a and the annular valve seat portion 25c has a diameter of the communication hole 25. The direct passage 25b (floating piston 20) is prevented from acting directly. The back surface (surface on the exhaust valve portion 18 side) of the umbrella portion 19b is a flat surface (a surface orthogonal to the shaft portion 19a) in the embodiment shown in FIG. 2, and a concave surface in the embodiment shown in FIG. In any embodiment, the umbrella-shaped portion 19 is provided so as not to prevent the exhaust valve portion 18a from being seated on the annular valve seat portion 25c.

  A pilot pressure chamber 30 is formed between the first upper housing 11 c and the floating piston 20. Each of the lower housing 11a, the middle housing 11b, and the first upper housing 11c is formed with an in-housing communication passage 31 for communicating the pilot pressure chamber 30 with the take-out chamber 17, and an orifice 31a is formed in a part of the passage 31. Is formed. The orifice 31 a generates a desired pressure in the pilot pressure chamber 30 by the pressure in the extraction chamber 17.

  The first upper housing 11c is formed with a conical portion 32 that protrudes upward from the shaft portion, and a nozzle passage 33 that communicates with the pilot pressure chamber 30 is formed through the conical portion 32. Has been.

  At the opening end of the nozzle passage 33, a leaf spring 41 (and an integral fixing pin 45) as an opening gap control plate for changing the distance from the nozzle passage 33 is located. The peripheral edge of the circular leaf spring 41 is sandwiched and fixed between the first and second upper housings 11c and 11d. The leaf spring 41 has a planar circular coil bobbin receiver 42 and a coil ( A coil bobbin 44 around which a moving coil 43 is wound is fixed concentrically by a fixing pin 45. The leaf spring 41, the coil bobbin receiver 42, the coil 43, the coil bobbin 44, and the fixing pin 45 constitute a flapper 40.

  A cylindrical permanent magnet assembly 46 is supported on the shaft portion of the second upper housing 11d. The permanent magnet assembly 46 includes a permanent magnet 46a and a yoke 46b that are coaxial with the coil bobbin 44 of the flapper 40 and face each other with a gap. The coil 43 and the permanent magnet assembly 46 constitute an electromagnetic drive device (extraction pressure adjusting means for changing the distance between the opening gap control plate 41 and the opening end of the nozzle passage 33) that elastically deforms the leaf spring 41. The room containing the permanent magnet assembly 46 and the flapper 40 communicates with the atmosphere.

  In the air regulator 10 having the above configuration, the main valve 15 normally opens the flow path 14 between the primary pressure inlet 12 and the secondary pressure outlet 13 to allow the bleed flow rate to flow. In this state, when the pressure in the secondary pressure extraction chamber 17 rises and overcomes the force of the compression coil spring 27 to push up the floating piston 20 in a balanced state, the annular valve seat portion 25 c moves away from the exhaust valve portion 18 and the extraction chamber 17. Relieve the air inside to the atmosphere. That is, the air in the secondary pressure extraction chamber 17 passes through the gap between the annular valve seat portion 25c and the exhaust valve portion 18, enters the relief chamber 23 from the communication hole 25, is exhausted from the atmosphere communication hole 26, and is extracted from the extraction chamber 17 (two The pressure on the side of the next pressure outlet 13) decreases.

  During this exhaust, the exhaust exhausted through the gap between the exhaust valve portion 18a and the annular valve seat portion 25c comes into contact with the back surface of the umbrella portion 19b of the umbrella-shaped portion 19, and the exhaust pressure directly acts on the floating piston 20. To prevent. The diameter of the umbrella portion 19b is preferably the same as that of the main valve 15 and the exhaust valve portion 18, but even if it is slightly smaller, the effect of suppressing the exhaust pressure from acting on the floating piston 20 can be obtained. Can do. In the case where the back surface of the umbrella part 19b is a flat surface as shown in FIG. 2 and the case where it is a concave surface as shown in FIG. 3, the case of the concave surface in FIG. It is considered that the action of the exhaust pressure on the floating piston 20 can be reduced, but in any case, a certain effect can be obtained. Conversely, even if the back surface of the umbrella portion 19b is a convex surface, there is a certain effect.

  Conversely, when the pressure in the extraction chamber 17 suddenly drops and the downward force by the pilot diaphragm 21 and the compression coil spring 27 becomes larger than the upward force by the control diaphragm 22, the floating piston 20 descends and the annular valve seat 25c. And the exhaust valve portion 18 come into contact with each other to stop the exhaust, and the main valve 15 is pushed down against the force of the compression spring 16 to open the passage 14 and flow from the primary pressure inlet 12 to the secondary pressure outlet 13. Increase. Accordingly, the primary pressure on the primary pressure inlet 12 side is guided to the secondary pressure extraction chamber 17 (secondary pressure outlet 13) side, and the pressure in the extraction chamber 17 (secondary pressure outlet 13) increases. That is, the floating piston 20 moves according to the pressure fluctuations in the secondary pressure outlet 13 and the pilot pressure chamber 30 and opens and closes the main valve 15. As a result of the above operation being repeated according to the pressure fluctuation in the secondary pressure extraction chamber 17, a constant secondary pressure can be taken out to the secondary pressure extraction port 13 regardless of the primary pressure from the primary pressure introduction port 12. .

  Further, when a forward / reverse current is passed through the coil 43, the flapper 40 (leaf spring 41) is elastically deformed and moved up and down by electromagnetic action with the permanent magnet assembly 46. When the flapper 40 moves up and down, the distance between the fixed pin 45 and the open end of the nozzle passage 33 changes, and the amount of change is proportional to the magnitude of current (or voltage) (analog electrical input signal). When the distance between the fixing pin 45 and the nozzle passage 33 is increased, the amount of air escaping from the pilot pressure chamber 30 is increased, and when the distance is decreased, the amount is decreased, so that the secondary pressure taken out from the secondary pressure outlet 13 is applied to the coil 43. It can be changed depending on the magnitude of the flowing current.

  In the above embodiment, the electromagnetic drive device is shown as the extraction pressure adjusting means for changing the distance between the opening gap control plate (plate spring) 41 and the opening end of the nozzle passage 33. However, the extraction pressure adjusting means is the invention of the present application. Is not directly related to the gist of

It is a longitudinal cross-sectional view which shows one Embodiment which applied this invention to the electropneumatic conversion type air regulator. It is an expanded sectional view of the exhaust valve part of the regulator of FIG. It is sectional drawing corresponding to FIG. 2 which shows another embodiment of this invention.

Explanation of symbols

DESCRIPTION OF SYMBOLS 10 Electropneumatic conversion type air regulator 11 Housing 11a Lower housing 11b Middle housing 11c 1st upper housing 11d 2nd upper housing 11e Cap body 12 Primary pressure inlet 13 Secondary pressure inlet 14 Passage 15 Main valve 16 Compression spring 17 Secondary Pressure extraction chamber 18 Exhaust valve portion 19 Umbrella portion 19a Shaft portion 19b Umbrella portion 20 Floating piston 21 Pilot diaphragm 22 Control diaphragm 23 Relief chamber 24 Exhaust valve block 25 Communication hole 25a Shaft portion passage 25b Radial passage 25c Annular valve seat portion 26 Atmospheric communication hole 27 Compression coil spring 30 Pilot pressure chamber 31 Housing passage 31a Orifice 33 Nozzle passage 40 Flapper 41 Leaf spring (opening clearance control plate)
42 Coil bobbin receiver 43 Coil 44 Coil bobbin 45 Fixed pin 46 Permanent magnet assembly 46a Permanent magnet 46b Yoke

Claims (5)

A primary pressure inlet; a secondary pressure outlet; a main valve that opens and closes between the primary pressure inlet and the secondary pressure outlet; the main valve according to pressure fluctuations in the secondary pressure outlet and the pilot pressure chamber A floating piston that opens and closes;
The main valve integrally has an exhaust valve portion facing the floating piston, and the floating piston integrally has a valve seat portion that contacts and separates from the exhaust valve portion according to the position of the floating piston. In an air regulator that communicates the secondary pressure outlet to the atmosphere when separated from the valve part,
An umbrella-shaped portion is provided integrally with the exhaust valve portion of the main valve to receive the exhaust gas passing through the gap between the exhaust valve portion and the valve seat portion and prevent the exhaust from directly acting on the floating piston. To air regulator. The air regulator according to claim 1, wherein the umbrella-shaped portion has a flat surface on the exhaust valve portion side. The air regulator according to claim 1, wherein the umbrella-shaped portion has a concave surface on the exhaust valve portion side. The air regulator according to any one of claims 1 to 3, further comprising: a nozzle passage for communicating the pilot pressure chamber with the atmosphere; an opening gap control plate positioned at an opening end of the nozzle passage; and the opening gap control. An air regulator comprising: a take-out pressure adjusting means for changing a distance between the plate and the open end of the nozzle passage. 5. The air regulator according to claim 1, wherein the opening interval control plate is formed of an elastically deformable circular leaf spring having a fixed peripheral edge, and the extraction pressure adjusting means is disposed on the circular leaf spring. An air regulator which is an electromagnetic drive device comprising a concentrically provided coil and a fixed permanent magnet located at the center of the coil.

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