High Pressure Pneumatic Diaphragm Actuator

Abstract

The present invention discloses a high-pressure pneumatic diaphragm actuator, which relates to the field of valves, including a bottom shell, a diaphragm is arranged on the bottom shell, a wire rod is arranged on one side of the diaphragm, a tray is arranged on one side of the wire rod, the tray includes a tray inner ring and a tray outer ring, and a diaphragm cover is arranged on the side of the tray away from the wire rod. An air inlet is arranged on the bottom shell, and a driving rod is arranged at the center of the bottom shell. In the present application, after compressed air enters, the diaphragm moves upward, the center of the diaphragm directly transmits the thrust to the tray, the diaphragm outer ring transmits the thrust to the wire rod, the wire rod transmits the thrust to the tray, and the tray transmits the thrust to the driving rod, thereby driving the valve to move up and down; when the pneumatic diaphragm actuator is in a fully open state, the diaphragm outer ring transmits the thrust to the wire rod, the wire rod transmits all the thrust to the diaphragm cover, the diaphragm does not bear tensile stress, but only bears compressive stress, so that the high-pressure pneumatic diaphragm actuator can withstand a pressure of more than 600KPa, thereby improving the output force of the pneumatic diaphragm actuator.

Description

Technical Field

[0001] The invention relates to the field of valves, and in particular to a high-pressure pneumatic diaphragm actuator. Background Art

[0002] A pneumatic diaphragm actuator is a mechanism that uses an elastic diaphragm to convert input air pressure into thrust on a push rod, causing the valve core to produce a corresponding displacement through the push rod and changing the valve opening.

[0003] The pneumatic diaphragm actuator has a simple structure and is reliable to use. Even if the pneumatic diaphragm actuator is not used for a long time, the seal ring sticking failure that may occur in the cylinder actuator will not occur. When the pneumatic diaphragm actuator is used frequently, the service life of the pneumatic diaphragm actuator is also significantly better than that of the cylinder actuator, because the cylinder seal ring has friction loss during use. At the same time, the friction force of the cylinder seal ring is always opposite to the direction of movement, and the control accuracy is significantly lower than that of the pneumatic diaphragm actuator. Therefore, in order to improve the adjustment accuracy, the pneumatic control valve generally chooses a pneumatic diaphragm actuator to drive it.

[0004] However, the disadvantage of pneumatic diaphragm actuators is that the pressure on the diaphragm is relatively low. The maximum diaphragm chamber pressure is generally 250KPa, and the maximum diaphragm chamber pressure of special products is 400KPa. If it is increased further, the reliability of the diaphragm will be significantly reduced. In order to increase the output force, the usual practice is to increase the size, which makes the size and weight of the actuator very large.

[0005] On the other hand, the air source of the factory is usually 500-700KPa, but the existing pneumatic diaphragm actuator only uses 250KPa, and the air pressure is not fully utilized. At the same time, some working conditions have requirements for the weight and center of gravity of the valve, such as nuclear-grade control valves. Too large an actuator will affect the anti-seismic performance of the valve. Summary of the invention

[0006] In order to overcome the above disadvantages, the object of the present invention is to provide a high-pressure pneumatic diaphragm actuator which improves the pressure bearing capacity of the diaphragm and multiplies the output force of the diaphragm.

[0007] In order to achieve the above purpose, the technical solution adopted by the present invention is as follows: the high-pressure pneumatic diaphragm actuator includes a bottom shell, a diaphragm is arranged on the bottom shell, a wire rod is arranged on the side of the diaphragm away from the bottom shell, a tray is arranged on the side of the wire rod away from the diaphragm, the tray includes a tray inner ring and a tray outer ring, the tray inner ring contacts the diaphragm, the tray outer ring contacts the wire rod, and a diaphragm cover is arranged on the side of the tray away from the wire rod. The diaphragm, wire rod and tray are arranged between the bottom shell and the diaphragm cover, and the bottom shell and the diaphragm cover are fixedly connected by bolts. After air enters, the diaphragm moves upward, and the wire rod is used to bear the thrust of the compressed air transmitted by the diaphragm. The tray inner ring directly contacts the diaphragm and bears the thrust transmitted by the diaphragm; the tray outer ring contacts the wire rod and bears the thrust of the wire rod. The wire rod is close to the diaphragm, and the position of each layer of the wire rod moving up and down is different as the diaphragm bears different thrust. When the pneumatic diaphragm actuator is in the fully open state, the inner ring of the diaphragm transfers all the thrust to the inner ring of the tray, the tray is pushed upward, and the outer ring of the tray does not contact the wire rod. At this time, the wire rod contacts the diaphragm cover and transfers all the thrust to the diaphragm cover. The diaphragm cover is made of metal material, can withstand large stress, and is not easy to be damaged.

[0008] The bottom shell is provided with an air inlet, through which compressed air enters the high-pressure pneumatic diaphragm actuator. After the compressed air enters the air inlet, the diaphragm moves upward. A driving rod is provided at the center of the bottom shell. The high-pressure pneumatic actuator eventually transmits the thrust to the driving rod, which drives the valve to move up and down. The driving rod passes through the tray, the diaphragm and the bottom shell in sequence from top to bottom.

[0009] In the present application, after the compressed air enters, the diaphragm moves upward, the inner ring of the diaphragm directly transmits the thrust to the tray, the outer ring of the diaphragm transmits the thrust to the wire rod, the wire rod transmits the thrust to the tray, and the tray transmits the thrust to the drive rod, thereby driving the valve to move up and down; when the pneumatic diaphragm actuator is in a fully open state, the outer ring of the diaphragm transmits the thrust to the wire rod. At this time, the wire rod is not in contact with the tray but in contact with the diaphragm cover, and all the thrust is transmitted to the diaphragm cover. The diaphragm does not bear tensile stress but only compressive stress, so that the high-pressure pneumatic diaphragm actuator can withstand a pressure of more than 600KPa. On the one hand, it improves the output force of the pneumatic diaphragm actuator, and on the other hand, it can make full use of the air pressure of the air source.

[0010] Working principle:

[0011] Compressed air enters the pneumatic diaphragm actuator through the air inlet. After the compressed air enters the air inlet, the diaphragm is subjected to the thrust generated by the compressed air. The inner ring of the diaphragm directly transmits the thrust to the tray, and the outer ring of the diaphragm transmits the thrust to a wire rod. The wire rod transmits the thrust to the tray, and the tray transmits the thrust to the drive rod, thereby driving the valve to move up and down. When the pneumatic diaphragm actuator is in a fully open state, the outer ring of the diaphragm transmits the thrust to the wire rod. At this time, the wire rod is not in contact with the tray but in contact with the diaphragm cover, and all the thrust is transmitted to the diaphragm cover.

[0012] Furthermore, the wire rod is made of flat steel bar and is rolled according to the Kimedian spiral. The shape of the wire rod is similar to that of mosquito coils. The wire rod includes a wire rod head end and a wire rod tail end. Adjacent layers of the wire rod can slide up and down so that it can be close to the diaphragm. As the diaphragm deforms, it moves up and down, so that the wire rod can always support the diaphragm and reduce the stress on the diaphragm. The wire rod head end is in contact with the inner ring of the tray, and the wire rod transfers the thrust to the outer ring of the tray, thereby transferring the thrust to the membrane cover.

[0013] Furthermore, support ribs are arranged in an array on the inner wall of the diaphragm cover, and the support ribs are used to bear the thrust transmitted by the wire rod. When the pneumatic diaphragm actuator is in a fully open state, the wire rod transmits all the thrust to the support ribs, so that the support ribs bear the tensile stress of the diaphragm, so that the diaphragm does not bear tensile stress, but only tensile stress, thereby improving the output force of the pneumatic diaphragm actuator.

[0014] Furthermore, a rib groove is provided at a position on the tray corresponding to the support rib, and when the tray moves upward, the rib groove moves along the support rib to prevent the tray from interfering with the support rib when moving.

[0015] Furthermore, a spring group is arranged on the outer surface of the driving rod in the membrane cover, the spring group is between the membrane cover and the tray, and the spring group is used to drive the membrane to reset. When the compressed air is discharged from the air inlet, the membrane is reset under the drive of the spring group.

[0016] Furthermore, a plurality of columns are arranged in an array on the bottom shell, and the columns are used to connect the valve and the pneumatic diaphragm actuator.

[0017] Furthermore, a handwheel is arranged on one end of the membrane cover away from the column, the handwheel corresponds to the position of the driving rod, the handwheel is used to drive the driving rod to move, and the handwheel is used when there is no air source.

[0018] The beneficial effect of the present invention is that after the compressed air enters, the diaphragm moves upward, the center position of the diaphragm directly transmits the thrust to the tray, the outer ring of the diaphragm transmits the thrust to the wire rod, the wire rod transmits the thrust to the tray, and the tray transmits the thrust to the drive rod, thereby driving the valve to move up and down; when the pneumatic diaphragm actuator is in a fully open state, the outer ring of the diaphragm transmits the thrust to the wire rod. At this time, the wire rod is not in contact with the tray but directly contacts the diaphragm cover, and all the thrust is transmitted to the diaphragm cover. The diaphragm does not bear tensile stress but only compressive stress, so that the high-pressure pneumatic diaphragm actuator can withstand a pressure of more than 600KPa. On the one hand, it improves the output force of the pneumatic diaphragm actuator, and on the other hand, it can make full use of the air pressure of the air source. BRIEF DESCRIPTION OF THE DRAWINGS

[0019] Figure 1 is an overall cross-sectional view of an embodiment of the present invention;

[0020] Figure 2 A schematic diagram of the structure of a wire rod according to an embodiment of the present invention;

[0021] Figure 3 A schematic diagram of the structure of a membrane cover according to an embodiment of the present invention;

[0022] Figure 4 It is a schematic diagram of the structure of the pallet;

[0023] Figure 5 It is a schematic diagram of the assembly of the tray and the membrane cover;

[0024] In the figure: 1. bottom shell; 2. diaphragm; 3. wire rod; 4. tray; 5. inner ring of tray; 6. outer ring of tray; 7. membrane cover; 8. air inlet; 9. driving rod; 10. head end of wire rod; 11. tail end of wire rod; 12. supporting rib; 13. rib groove; 14. spring assembly; 15. column; 16. hand wheel. DETAILED DESCRIPTION

[0025] The preferred embodiments of the present invention are described in detail below in conjunction with the accompanying drawings so that the advantages and features of the present invention can be more easily understood by those skilled in the art, thereby making a clearer and more definite definition of the protection scope of the present invention.

[0026] In the description of the present invention, it should be noted that the terms "center", "upper", "lower", "left", "right", "vertical", "horizontal", "inside", "outside" and the like indicate positions or positional relationships based on the positions or positional relationships shown in the drawings, and are only for the convenience of describing the present invention and simplifying the description, rather than indicating or implying that the device or element referred to must have a specific position, be constructed and operated in a specific position, and therefore cannot be understood as limiting the present invention; the terms "first", "second", and "third" are only used for descriptive purposes, and cannot be understood as indicating or implying relative importance. In addition, unless otherwise clearly specified and limited, the terms "installed", "connected", and "connected" should be understood in a broad sense, for example, it can be a fixed connection, a detachable connection, or an integral connection; it can be a mechanical connection or an electrical connection; it can be a direct connection, or it can be an indirect connection through an intermediate medium, or it can be a connection between the two elements. For those of ordinary skill in the art, the specific meanings of the above terms in the present invention can be understood according to specific circumstances.

[0027] See attached Figure 1 , Figure 4 As shown, an embodiment of the present application provides a high-pressure pneumatic diaphragm actuator, which includes a bottom shell 1, a diaphragm 2 is arranged on the bottom shell 1, a wire rod 3 is arranged on the side of the diaphragm 2 away from the bottom shell 1, a tray 4 is arranged on the side of the wire rod 3 away from the diaphragm 2, the tray 4 includes a tray inner ring 5 and a tray outer ring 6, the tray inner ring 5 contacts the diaphragm 2, the tray outer ring 6 contacts the wire rod 3, and a diaphragm cover 7 is arranged on the side of the tray 4 away from the wire rod 3. The diaphragm 2, the wire rod 3 and the tray 4 are arranged between the bottom shell 1 and the diaphragm cover 7, and the bottom shell 1 and the diaphragm cover 7 are fixedly connected by bolts. After air enters, the diaphragm 2 moves upward, and the wire rod 3 is used to bear the thrust of the compressed air transmitted from the diaphragm 2. The tray inner ring 5 directly contacts the diaphragm 2 and bears the thrust transmitted from the diaphragm 2; the tray outer ring 6 contacts the wire rod 3 and bears the thrust of the wire rod 3. The wire rod 3 is in close contact with the diaphragm 2. As the diaphragm 2 is subjected to different thrusts, the position of each layer of the wire rod 3 moving up and down is different. When the pneumatic diaphragm actuator is in the fully open state, the inner ring of the diaphragm transmits all the thrust to the inner ring 5 of the tray. The tray 4 is pushed upward and does not contact the wire rod 3. At this time, the wire rod 3 contacts the diaphragm cover 7 and transmits all the thrust to the diaphragm cover 7. The diaphragm cover 7 is made of metal material, which can withstand large stress and is not easy to be damaged. The inner ring of the diaphragm is Figure 1 The upwardly bent portion is in direct contact with the inner ring of the tray; the outer ring of the diaphragm is the portion in contact with the wire rod.

[0028] The bottom shell 1 is provided with an air inlet 8, through which compressed air enters the high-pressure pneumatic diaphragm actuator. After compressed air enters the air inlet 8, the diaphragm 2 moves upward. A driving rod 9 is provided at the center of the bottom shell 1. The high-pressure pneumatic actuator eventually transmits thrust to the driving rod 9, and the driving rod 9 drives the valve to move up and down. The driving rod 9 passes through the tray 4, the diaphragm 2 and the bottom shell 1 from top to bottom.

[0029] In the present application, after the compressed air enters, the diaphragm 2 moves upward, the inner ring of the diaphragm directly transmits the thrust to the tray 4, the outer ring of the diaphragm transmits the thrust to the wire rod 3, the wire rod 3 transmits the thrust to the tray 4, and the tray 4 transmits the thrust to the drive rod 9, thereby driving the valve to move up and down; when the pneumatic diaphragm actuator is in a fully open state, the outer ring of the diaphragm transmits the thrust to the wire rod 3. At this time, the wire rod 3 is not in contact with the tray 4 but in contact with the diaphragm cover 7, and all the thrust is transmitted to the diaphragm cover 7. The diaphragm 2 does not bear tensile stress but only compressive stress, so that the high-pressure pneumatic diaphragm actuator can withstand a pressure of more than 600KPa. On the one hand, it improves the output force of the pneumatic diaphragm actuator, and on the other hand, it can make full use of the air pressure of the air source.

[0030] Working principle:

[0031] Compressed air enters into the pneumatic diaphragm actuator through the air inlet 8. After the compressed air enters the air inlet 8, the diaphragm 2 is subjected to the thrust generated by the compressed air. The inner ring of the diaphragm directly transmits the thrust to the tray 4, and the outer ring of the diaphragm transmits the thrust to the wire rod 3. The wire rod 3 transmits the thrust to the tray 4, and the tray 4 transmits the thrust to the driving rod 9, thereby driving the valve to move up and down. When the pneumatic diaphragm actuator is in a fully open state, the outer ring of the diaphragm transmits the thrust to the wire rod 3. At this time, the wire rod 3 is not in contact with the tray 4 but in contact with the diaphragm cover 7, and all the thrust is transmitted to the diaphragm cover 7.

[0032] On the basis of the above, if Figure 2 As shown, the wire rod 3 is made of flat steel bar, which is rolled according to the Kimedian spiral, and is wound around one circle. The shape of the wire rod 3 is similar to mosquito coils. The wire rod 3 includes a wire rod head end 10 and a wire rod tail end 11. The adjacent layers of the wire rod 3 can slide up and down so that it can be close to the diaphragm. It moves up and down with the deformation of the diaphragm, so that the wire rod 3 can always support the diaphragm 2 and reduce the stress on the diaphragm 2. The wire rod head end 10 is in contact with the inner ring 5 of the tray, and the wire rod 3 transfers the thrust to the outer ring 6 of the tray, thereby transferring the thrust to the membrane cover 7.

[0033] On the basis of the above, if Figure 3As shown, support ribs 12 are arranged in an array on the inner wall of the diaphragm cover 7, and the support ribs 12 are used to bear the thrust transmitted by the wire rod 3. When the pneumatic diaphragm actuator is in a fully open state, the wire rod 3 transmits all the thrust to the support ribs 12, so that the support ribs 12 bear the tensile stress of the diaphragm 2, so that the diaphragm 2 does not bear tensile stress, but only tensile stress, thereby improving the output force of the pneumatic diaphragm actuator.

[0034] On the basis of the above, if Figure 4 As shown, a rib groove 13 is provided on the tray 4 at a position corresponding to the support rib 12. When the tray 4 moves upward, the rib groove 13 moves along the support rib 12 to prevent the tray 4 from interfering with the support rib 12 when moving.

[0035] On the basis of the above, a spring group 14 is provided on the outer surface of the driving rod 9 in the membrane cover 7, and the spring group 14 is located between the membrane cover 7 and the tray 4. The spring group 14 is used to drive the diaphragm 2 to reset. When the compressed air is discharged from the air inlet 8, the diaphragm 2 is reset under the drive of the spring group 14.

[0036] On the basis of the above, a plurality of columns 15 are arranged in an array on the bottom shell 1, and the columns 15 are used to connect the valve and the pneumatic diaphragm actuator.

[0037] On the basis of the above, a handwheel 16 is provided on the end of the membrane cover 7 away from the column 15. The handwheel 16 corresponds to the position of the driving rod 9. The handwheel 16 is used to drive the driving rod 9 to move. The handwheel 16 is used when there is no air source.

[0038] The above implementation modes are only for illustrating the technical concept and features of the present invention, and their purpose is to enable people familiar with this technology to understand the content of the present invention and implement it, and they cannot be used to limit the protection scope of the present invention. Any equivalent changes or modifications made according to the spirit of the present invention should be included in the protection scope of the present invention.

Claims

1. A high-pressure pneumatic diaphragm actuator, comprising a bottom housing (1), characterized in that: A diaphragm (2) is arranged on the bottom shell (1); a wire rod (3) is arranged on a side of the diaphragm (2) away from the bottom shell (1); a tray (4) is arranged on a side of the wire rod (3) away from the diaphragm (2); the tray (4) comprises a tray inner ring (5) and a tray outer ring (6); the tray inner ring (5) is in contact with the diaphragm (2); the tray outer ring (6) is in contact with the wire rod (3); and a diaphragm cover (7) is arranged on a side of the tray (4) away from the wire rod (3); The bottom shell (1) is provided with an air inlet (8), and a driving rod (9) is provided at the center of the bottom shell (1). The driving rod (9) passes through the tray (4), the diaphragm (2) and the bottom shell (1) in sequence from top to bottom. The wire rod (3) is made of a flat steel bar and is wound in a spiral. The wire rod (3) comprises a wire rod head end (10) and a wire rod tail end (11). Adjacent layers of the wire rod (3) can slide up and down so that they can conform to the deformation of the diaphragm (2). The wire rod head end (10) is in contact with the inner ring (5) of the tray.

2. The high pressure pneumatic diaphragm actuator according to claim 1, characterized in that: Support ribs (12) are arranged in an array on the inner side wall of the membrane cover (7).

3. The high pressure pneumatic diaphragm actuator according to claim 1, characterized in that: A rib groove (13) is provided on the tray (4) at a position corresponding to the supporting rib (12).

4. The high pressure pneumatic diaphragm actuator according to claim 1, characterized in that: A spring group (14) is provided on the outer surface of the driving rod (9) in the membrane cover (7), and the spring group (14) is located between the membrane cover (7) and the tray (4).

5. The high pressure pneumatic diaphragm actuator according to claim 1, characterized in that: A plurality of columns (15) are arranged in an array on the bottom shell (1).

6. The high pressure pneumatic diaphragm actuator according to claim 5, characterized in that: A hand wheel (16) is provided on one end of the membrane cover (7) away from the column (15); the hand wheel (16) corresponds to the position of the driving rod (9); and the hand wheel (16) is used to drive the driving rod (9) to move.

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