Reaction head manual switching device

Abstract

The application discloses a manual switching device of a reaction film head, which comprises a hand wheel component, a screw rod component, an upper film cover, a lower film cover, a diaphragm assembly, a plurality of springs and a valve rod connecting piece. The adjusting screw rod, the thrust ball bearing, the hexagon nut and the hand wheel connecting piece are arranged in the axial force transmission chain of the diaphragm assembly, so that the hand wheel driving force is converted into the axial displacement of the diaphragm assembly through the adjusting screw rod. In the pneumatic mode, the air source enters the air pressure cavity through the air hole of the lower film cover to drive the diaphragm assembly to move, and the adjusting screw rod moves axially with the diaphragm assembly without changing the original stroke calibration. In the manual mode, the operator rotates the hand wheel to drive the hand wheel connecting piece, the tray fixing bolt and the diaphragm assembly to move through the thrust ball bearing and the hexagon nut. The device can realize the emergency opening and closing of the valve when there is no air source or the pneumatic control fails, and meanwhile, the device has the advantages of manual labor saving, stable stroke and compact structure.

Description

Technical Field

[0001] This invention relates to the field of industrial automation control valve actuator technology, and more specifically, to a manual switching device for a reaction diaphragm head. Background Technology

[0002] Diaphragm actuators are commonly used valve drive devices in industrial automation control systems. They convert input air pressure into axial thrust of a push rod via an elastic diaphragm, which then drives the valve stem to adjust the valve opening. Reaction-type pneumatic diaphragm actuators have the characteristic of retracting the push rod inward when the input air pressure increases, meeting the safety control requirements under specific operating conditions.

[0003] In existing reaction-actuated pneumatic diaphragm actuators, after stroke calibration and assembly with a valve, the upper and lower limit positions of the push rod and the valve stroke are usually fixed. When the external air supply is interrupted or the pneumatic control fails, emergency valve operation is required via a handwheel device. However, conventional handwheel structures are prone to interference between manual operation and pneumatic control. The manual drive structure may alter the calibrated position of the diaphragm assembly or push rod, leading to valve control errors in pneumatic mode. Furthermore, threaded drive components experience significant frictional resistance under axial loads, making manual valve opening and closing time-consuming and labor-intensive under high pressure differential conditions.

[0004] Therefore, it is necessary to provide a manual switching device suitable for reaction membrane heads, which can reliably achieve manual opening and closing in the absence of an air source, maintain the original stroke calibration accuracy in pneumatic control mode, and reduce the resistance of handwheel operation. Summary of the Invention

[0005] The purpose of this invention is to solve the problems mentioned in the background art. This invention provides a manual switching device for reaction membrane heads to solve the problems of existing reaction pneumatic membrane actuators being difficult to operate manually in emergencies when the air source is interrupted, the manual mechanism and the pneumatic stroke easily interfering with each other, and the large resistance of the handwheel operation.

[0006] The present invention adopts the following technical solution:

[0007] A manual switching device for a reaction membrane head includes a handwheel assembly, a screw assembly, an upper membrane cover, a lower membrane cover, a diaphragm assembly, several springs, and a valve stem connector.

[0008] The diaphragm assembly includes a diaphragm, a diaphragm pressure plate, and a diaphragm tray. The edge of the diaphragm is clamped between the upper and lower diaphragm covers to form a sealed air pressure chamber. The diaphragm pressure plate and the diaphragm tray are respectively fixed to the upper and lower surfaces in the middle of the diaphragm and locked by tray fixing bolts and nuts to form an integrated linkage structure.

[0009] The screw assembly includes an adjusting screw, a thrust ball bearing, and a hexagonal nut. The upper end of the adjusting screw is connected to the handwheel assembly for transmission, and the lower end is engaged with the hexagonal nut through the thrust ball bearing. The hexagonal nut is fixedly connected to the handwheel connector of the diaphragm assembly. The tray fixing bolt is fixedly connected to the lower part of the handwheel connector. The adjusting nut is installed on the upper end of the upper diaphragm cover. The adjusting screw passes through the adjusting nut and is threadedly connected to the adjusting nut.

[0010] The upper end of the spring abuts against the inner wall of the upper membrane cover, and the lower end abuts against the diaphragm tray;

[0011] The valve stem connector is installed at the lower end of the tray fixing bolt and is rigidly connected to the valve stem to realize power transmission. The bottom of the adjusting screw, the thrust ball bearing and the hexagonal nut are all located inside the handwheel connector.

[0012] Ventilation holes are provided on the side wall of the lower membrane cover.

[0013] Furthermore, the adjusting nut includes a guide portion and a connecting portion. The connecting portion is located on the lower outer ring of the guide portion. The lower end of the guide portion is provided with a handwheel connecting groove, and the upper end of the guide portion is provided with a threaded groove through which the adjusting screw passes.

[0014] Furthermore, the connecting part is connected to the top of the upper membrane cover by fasteners, and the upper end of the upper membrane cover is provided with a connecting part clearance groove two corresponding to the connecting part clearance groove one.

[0015] Furthermore, the upper end of the diaphragm pressure plate is provided with an annular groove, and the bottom of the spring is located at the annular groove.

[0016] Furthermore, the handwheel connector includes a top plate, a bottom plate, a left plate, a right plate, and a rear plate. The left and right plates are located on both sides of the rear plate. The top and bottom plates are respectively connected to the top and bottom of the left and right plates. The top and bottom plates are provided with corresponding opening slots, including slot one and slot two. Slot one is semi-circular, and slot two is rectangular. The thrust ball bearing is located between the top and bottom plates, and the outer diameter of the thrust ball bearing is larger than the diameter of slot one.

[0017] Furthermore, the adjusting screw includes a connector, a first connecting rod, a second connecting rod, and a limiting ring. The first connecting rod is threadedly connected to the adjusting nut. The diameter of the second connecting rod is smaller than the diameter of the first groove. The limiting ring is set on the second connecting rod. The thrust ball bearing is installed on the second connecting rod. The hexagonal nut is installed at the lower end of the second connecting rod. The thrust ball bearing is located between the limiting ring and the hexagonal nut.

[0018] Furthermore, the bolt head of the tray fixing bolt is installed on the upper end of the base plate of the handwheel connector, and the tray fixing bolt passes through the base plate, diaphragm, diaphragm pressure plate and diaphragm tray, and the nut is locked at the bottom of the diaphragm tray.

[0019] Furthermore, the lower end of the lower membrane cover is provided with several blind holes for installation, and the middle of the lower membrane cover is provided with a valve stem connector through hole.

[0020] Beneficial effects

[0021] This invention arranges the handwheel component, adjusting screw, thrust ball bearing, hexagonal nut, and handwheel connector on the axial force transmission path of the diaphragm assembly, so that the manual drive process and the pneumatic drive process act on the same diaphragm assembly and valve stem connector, which can reduce the influence of the manual mechanism on the pneumatic stroke calibration.

[0022] This invention incorporates a thrust ball bearing between the adjusting screw and the hexagonal nut. During handwheel operation, the thrust ball bearing bears the axial load and reduces end-face friction. Compared to ordinary threaded direct pressure bearing structures, this reduces the handwheel's rotational resistance and improves emergency operation efficiency in the absence of an air source.

[0023] This invention uses tray fixing bolts to lock the diaphragm, diaphragm pressure plate, and diaphragm tray into an integrated linkage structure, and further connects it with the handwheel connector and valve stem connector, so that both pneumatic and manual forces can be stably transmitted to the valve stem, improving the consistency of device operation. Attached Figure Description

[0024] Figure 1 This is a schematic diagram of an embodiment of the present invention;

[0025] Figure 2 This is a cross-sectional view of an embodiment of the present invention;

[0026] Figure 3 This is a schematic diagram of the upper membrane cover according to an embodiment of the present invention;

[0027] Figure 4 This is a schematic diagram of the lower membrane cover according to an embodiment of the present invention;

[0028] Figure 5 This is a schematic diagram of the bottom view of the lower membrane cover according to an embodiment of the present invention;

[0029] Figure 6 This is a schematic diagram of a diaphragm pressing plate according to an embodiment of the present invention;

[0030] Figure 7 This is a schematic diagram of an adjusting screw according to an embodiment of the present invention;

[0031] Figure 8 This is a schematic diagram of a handwheel connector according to an embodiment of the present invention;

[0032] Figure 9 This is a schematic diagram of an adjusting nut according to an embodiment of the present invention;

[0033] Figure 10 This is a cross-sectional view of an adjusting nut according to an embodiment of the present invention. Detailed Implementation

[0034] To make the objectives, technical solutions, and advantages of this invention clearer, the invention will be further described in detail below with reference to the accompanying drawings and embodiments. It should be understood that the specific embodiments described herein are merely illustrative and not intended to limit the invention.

[0035] As shown in the figure, this invention discloses a manual switching device for a reaction membrane head, comprising a handwheel component 1, a screw component, an upper membrane cover 2, a lower membrane cover 3, a membrane assembly, several springs 4, and a valve stem connector 5.

[0036] The diaphragm assembly includes a diaphragm 6, a diaphragm pressure plate 7, and a diaphragm tray 8. The edge of the diaphragm 6 is clamped between the upper diaphragm cover 2 and the lower diaphragm cover 3 to form a sealed air pressure chamber. The diaphragm pressure plate 7 and the diaphragm tray 8 are respectively fixed to the upper and lower surfaces in the middle of the diaphragm 6 and locked by tray fixing bolts 9 and nuts 10 to form an integrated linkage structure.

[0037] The screw assembly includes an adjusting screw 11, a thrust ball bearing 12, and a hexagonal nut 13. The upper end of the adjusting screw 11 is connected to the handwheel assembly 1 for transmission, and the lower end is engaged with the hexagonal nut 13 through the thrust ball bearing 12. The hexagonal nut 13 is fixedly connected to the handwheel connector 14 of the diaphragm assembly. The tray fixing bolt 9 is fixedly connected to the lower part of the handwheel connector 14. An adjusting nut 15 is installed on the upper end of the upper diaphragm cover 2. The adjusting screw 11 passes through the adjusting nut 15, and the adjusting screw 11 is threadedly connected to the adjusting nut 15.

[0038] The upper end of the spring 4 abuts against the inner wall of the upper membrane cover 3, and the lower end abuts against the membrane tray 8;

[0039] The valve stem connector 5 is installed at the lower end of the tray fixing bolt 9 and is rigidly connected to the valve stem to realize power transmission. The bottom of the adjusting screw 11, the thrust ball bearing 12 and the hexagonal nut 13 are all located inside the handwheel connector 14.

[0040] Ventilation holes 301 are provided on the side wall of the lower membrane cover 3.

[0041] The handwheel assembly 1, adjusting screw 11, thrust ball bearing 12, hexagonal nut 13, handwheel connector 14, tray fixing bolt 9, and diaphragm assembly are arranged along the same axial force transmission path. In pneumatic mode, the diaphragm assembly moves under air pressure and spring 4, and the adjusting screw 11 can make corresponding axial displacements with the diaphragm assembly. In manual mode, the handwheel assembly 1 applies axial force to the hexagonal nut 13 via the adjusting screw 11 and thrust ball bearing 12, and then the handwheel connector 14 and tray fixing bolt 9 drive the diaphragm assembly to move. Thus, the two working modes share the same diaphragm assembly and valve stem connector 5, which can reduce the impact of mode switching on stroke calibration.

[0042] In one embodiment of the present invention, the adjusting nut 15 includes a guide portion 151 and a connecting portion 152. The connecting portion 152 is disposed on the lower outer ring of the guide portion 151. The lower end of the guide portion 151 is provided with a handwheel connecting member clearance groove 153. The upper end of the guide portion 151 is provided with a threaded groove 154. The adjusting screw 11 passes through the threaded groove 154.

[0043] The adjusting nut 15 simultaneously forms a guide portion 151 and a connecting portion 152. The guide portion 151 is used to thread into the adjusting screw 11, and the connecting portion 152 is used to connect and fix to the upper diaphragm cover 2, so that the adjusting nut 15 has both transmission guidance and installation positioning functions. The handwheel connector clearance groove 153 at the lower end of the guide portion 151 can prevent the handwheel connector 14 from interfering with the lower end of the adjusting nut 15 when it moves upward, thereby ensuring that the manual adjustment stroke matches the movement stroke of the diaphragm assembly.

[0044] In one embodiment of the present invention, the connecting part 152 is connected to the top of the upper membrane cover 2 by fasteners, and the upper end of the upper membrane cover 2 is provided with a connecting member avoidance groove 201 corresponding to the connecting member avoidance groove 1.

[0045] The adjusting nut 15 is fixed to the top of the upper membrane cover 2 via the connecting part 152, and forms a corresponding clearance space with the connecting part clearance groove 201 on the upper membrane cover 2 via the first clearance groove 153 of the handwheel connector, so that the handwheel connector 14 does not structurally interfere with the adjusting nut 15 and the upper membrane cover 2 when it moves with the diaphragm assembly. This arrangement can reserve axial movement space for the handwheel connector 14 while maintaining the strength of the upper threaded drive support.

[0046] In one embodiment of the present invention, the upper end of the diaphragm pressure plate 7 is provided with an annular groove 71, and the bottom of the spring 4 is located at the annular groove 71.

[0047] An annular groove 71 is provided at the upper end of the diaphragm pressure plate 7, and the bottom of the spring 4 is located at the annular groove 71. The annular groove 71 can radially limit the spring 4, so that the spring 4 remains relatively centered during compression and reset, reducing the influence of the spring 4's deflection on the movement trajectory of the diaphragm assembly, and helping to improve the stability of the axial movement of the diaphragm assembly.

[0048] In one embodiment of the present invention, the handwheel connector 14 includes a top plate 141, a bottom plate 142, a left plate 143, a right plate 144, and a rear plate 145. The left plate 143 and the right plate 144 are disposed on both sides of the rear plate 145. The top plate 141 and the bottom plate 142 are respectively connected to the top and bottom of the left plate 143 and the right plate 144. The top plate 141 and the bottom plate 142 are provided with corresponding opening slots, including slot one 146 and slot two 147. Slot one 146 is semi-circular, and slot two 147 is rectangular. The thrust ball bearing 12 is located between the top plate 141 and the bottom plate 142, and the outer diameter of the thrust ball bearing 12 is larger than the diameter of slot one 146.

[0049] The handwheel connector 14 adopts a semi-enclosed structure formed by a top plate 141, a bottom plate 142, a left plate 143, a right plate 144, and a rear plate 145. The slots on the top plate 141 and the bottom plate 142 provide assembly and movement clearance for the adjusting screw 11. The outer diameter of the thrust ball bearing 12 is larger than the diameter of the slot 146, allowing it to be confined between the top plate 141 and the bottom plate 142. This structure facilitates the installation of the adjusting screw 11, the thrust ball bearing 12, and the hexagonal nut 13 into the handwheel connector 14, and also provides reliable axial restraint for the thrust ball bearing 12 during manual operation, ensuring smooth transmission of handwheel force to the diaphragm assembly. Furthermore, the slot design facilitates quick installation with other parts.

[0050] In one embodiment of the present invention, the adjusting screw 11 includes a connector 111, a first connecting rod 112, a second connecting rod 113, and a limiting ring 114. The first connecting rod 112 is threadedly connected to the adjusting nut 15. The diameter of the second connecting rod 113 is smaller than the diameter of the first groove 146. The limiting ring 114 is disposed on the second connecting rod 112. A thrust ball bearing 12 is mounted on the second connecting rod 113. A hexagonal nut 13 is mounted on the lower end of the second connecting rod 112, and the thrust ball bearing 12 is located between the limiting ring 114 and the hexagonal nut 13. The connector 111 is square to facilitate power transmission.

[0051] The adjusting screw 11 adopts a segmented structure consisting of a connector 111, a first connecting rod 112, a second connecting rod 113, and a limiting ring 114. The connector 111 is used for transmission engagement with the handwheel assembly 1, the first connecting rod 112 is used for threaded transmission with the adjusting nut 15, and the second connecting rod 113 is used to install the thrust ball bearing 12 and the hexagonal nut 13. The limiting ring 114 and the hexagonal nut 13 are located on both sides of the thrust ball bearing 12. This structure separates the handwheel input, threaded lifting, and bearing pressure functions, which can reduce the frictional resistance of the axially stressed parts while ensuring the reliability of manual adjustment.

[0052] In one embodiment of the present invention, the bolt head of the tray fixing bolt 9 is installed on the upper end of the base plate 142 of the handwheel connector. The tray fixing bolt 9 passes through the base plate 142, the diaphragm 6, the diaphragm pressure plate 7 and the diaphragm tray 8, and the nut 10 is locked at the bottom of the diaphragm tray 8.

[0053] The tray fixing bolt 9 not only locks the diaphragm 6, diaphragm pressure plate 7, and diaphragm tray 8 into a whole, but its bolt head also mates with the base plate 142 of the handwheel connector 14, and its lower end connects to the valve stem connector 5, making the diaphragm assembly, handwheel connector 14, and valve stem connector 5 form a coaxial force transmission relationship. Therefore, both manual and pneumatic driving forces can be transmitted to the valve stem through the same diaphragm assembly, reducing the clearance and stroke error caused by additional switching components.

[0054] In one embodiment of the present invention, the lower end of the lower membrane cover 3 is provided with a plurality of blind holes 302, and the middle of the lower membrane cover 3 is provided with a valve stem connector through hole 303.

[0055] The lower membrane cover 3 has a blind hole 302 at the bottom and a valve stem connector through hole 303 in the middle, which separates the installation position of the membrane head from the lower valve body or bracket and the axial passage position of the valve stem connector 5. This facilitates the fixing of the lower membrane cover 3 to the external structure and does not affect the axial reciprocating movement of the valve stem connector 5, thereby improving the overall installation stability and movement reliability.

[0056] The above description is merely a preferred embodiment of the present invention; however, the scope of protection of the present invention is not limited thereto. Any equivalent substitutions or modifications made by those skilled in the art within the scope of the technology disclosed in the present invention, based on the technical solution and its improved concepts, should be covered within the scope of protection of the present invention.

Claims

1. A manual switching device for a reaction membrane head, characterized in that, Includes handwheel assembly, screw assembly, upper diaphragm cover, lower diaphragm cover, diaphragm assembly, several springs, and valve stem connector. The diaphragm assembly includes a diaphragm, a diaphragm pressure plate, and a diaphragm tray. The edge of the diaphragm is clamped between the upper and lower diaphragm covers to form a sealed air pressure chamber. The diaphragm pressure plate and the diaphragm tray are respectively fixed to the upper and lower surfaces in the middle of the diaphragm and locked by tray fixing bolts and nuts to form an integrated linkage structure. The screw assembly includes an adjusting screw, a thrust ball bearing, and a hexagonal nut. The upper end of the adjusting screw is connected to the handwheel assembly for transmission, and the lower end is engaged with the hexagonal nut through the thrust ball bearing. The hexagonal nut is fixedly connected to the handwheel connector of the diaphragm assembly. The tray fixing bolt is fixedly connected to the lower part of the handwheel connector. The adjusting nut is installed on the upper end of the upper diaphragm cover. The adjusting screw passes through the adjusting nut and is threadedly connected to the adjusting nut. The upper end of the spring abuts against the inner wall of the upper membrane cover, and the lower end abuts against the diaphragm tray; The valve stem connector is installed at the lower end of the tray fixing bolt and is rigidly connected to the valve stem to realize power transmission. The bottom of the adjusting screw, the thrust ball bearing and the hexagonal nut are all located inside the handwheel connector. Ventilation holes are provided on the side wall of the lower membrane cover.

2. The manual switching device for a reaction membrane head according to claim 1, characterized in that, The adjusting nut includes a guide part and a connecting part. The connecting part is located on the lower outer ring of the guide part. The lower end of the guide part is provided with a handwheel connecting groove, and the upper end of the guide part is provided with a threaded groove through which the adjusting screw passes.

3. The manual switching device for a reaction membrane head according to claim 2, characterized in that, The connecting part is connected to the top of the upper membrane cover by fasteners, and the upper end of the upper membrane cover is provided with a connecting part clearance groove two corresponding to the connecting part clearance groove one.

4. The manual switching device for a reaction membrane head according to claim 1, characterized in that, The upper end of the diaphragm pressure plate is provided with an annular groove, and the bottom of the spring is located at the annular groove.

5. The manual switching device for a reaction membrane head according to claim 1, characterized in that, The handwheel connector includes a top plate, a bottom plate, a left plate, a right plate, and a rear plate. The left and right plates are located on both sides of the rear plate. The top and bottom plates are connected to the top and bottom of the left and right plates, respectively. The top and bottom plates are provided with corresponding opening slots, including slot one and slot two. Slot one is semi-circular, and slot two is rectangular. The thrust ball bearing is located between the top and bottom plates, and the outer diameter of the thrust ball bearing is larger than the diameter of slot one.

6. The manual switching device for a reaction membrane head according to claim 5, characterized in that, The adjusting screw includes a connector, a first connecting rod, a second connecting rod, and a limiting ring. The first connecting rod is threadedly connected to the adjusting nut. The diameter of the second connecting rod is smaller than the diameter of the first connecting rod. The limiting ring is set on the second connecting rod. The thrust ball bearing is installed on the second connecting rod. The hexagonal nut is installed at the lower end of the second connecting rod. The thrust ball bearing is located between the limiting ring and the hexagonal nut.

7. The manual switching device for a reaction membrane head according to claim 5, characterized in that, The bolt head of the tray fixing bolt is installed on the upper end of the base plate of the handwheel connector. The tray fixing bolt passes through the base plate, diaphragm, diaphragm pressure plate and diaphragm tray, and the nut is locked at the bottom of the diaphragm tray.

8. The manual switching device for a reaction membrane head according to claim 1, characterized in that, The lower end of the lower membrane cover has several blind holes for installation, and the middle of the lower membrane cover has a through hole for the valve stem connector.

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