Dual-drive actuating mechanism for pneumatic diaphragm head

Abstract

The utility model is suitable for the field of valve execution components, and provides a pneumatic diaphragm head dual-drive execution mechanism which comprises a balance bin internally provided with a cavity, a guide hole formed in the side wall of the cavity and a push rod moving in the direction of the guide hole. An expansion film connected with the push rod is mounted in the cavity; a manual driving structure for driving the push rod to move is arranged above the balance bin and comprises a sleeve arranged at the end of the push rod in a sleeving mode, a locking structure arranged at the connecting position of the sleeve and the push rod to achieve positioning switching of the sleeve and the push rod and a handheld driving piece installed on the rack. The handheld driving piece is connected with the end of the sleeve through a transmission assembly. During pneumatic driving, the locking structure cancels positioning, and the sleeve and the push rod can slide relatively; during handheld driving, the locking structure is locked and positioned, and the sleeve and the push rod are in a positioning state, so that switching work under the dual-driving mode of pneumatic driving and handheld driving can be realized, and the problem that valve flow regulation is urgently needed due to the fact that pneumatic driving cannot work when the air pressure supply assembly is maintained is effectively solved.

Description

Technical Field

[0001] The utility model relates to the field of valve actuating components, in particular to a pneumatic diaphragm head double-drive actuating mechanism. Background Art

[0002] The pneumatic diaphragm actuator is a control device in the pneumatic unit combination instrument. In the production process, it is one of the important links in the automatic control system. It receives the output signal from the control room to open and close the valve to achieve automatic adjustment of medium pressure, temperature, flow, liquid level and other parameters. It is widely used in automatic adjustment and remote control in the petroleum, chemical, metallurgy, electric power and pharmaceutical industries.

[0003] The pneumatic diaphragm actuator is a common driving device for regulating valves, which is used to control and adjust the valve opening. At present, the commonly used pneumatic diaphragm regulating valves are mainly single-drive structures (single pneumatic structure), which mainly include a hollow chamber, an air film installed in the hollow chamber, and a load spring. In the normal operation of the actuator, the negative pressure in the air film should be in a non-zero state, that is, the air pressure supply component (usually an air pump) should normally output the predetermined air pressure to control the opening of the valve port. However, in the actual use of the equipment, it is inevitable that the equipment will be damaged and need to stop working for maintenance. The air pressure supply component is no exception. During the above-mentioned working process, it cannot supply air pressure to the actuator, which further causes the valve to be unable to be effectively controlled.

[0004] In summary, the prior art obviously has inconveniences and defects in practical use, so it is necessary to improve it. Utility Model Content

[0005] In view of the above-mentioned defects, the purpose of the utility model is to provide a pneumatic diaphragm dual-drive actuator, which can realize switching between pneumatic and handheld dual-drive modes, effectively solving the problem that the pneumatic drive cannot work when the air pressure supply component is under maintenance and valve flow regulation is urgently needed.

[0006] In order to achieve the above-mentioned purpose, the utility model provides a pneumatic diaphragm head dual-drive actuator, including a balancing chamber with a chamber inside, a guide hole arranged on the side wall of the chamber and a push rod moving along the guide hole; the chamber is equipped with an expansion film connected to the push rod; a manual drive structure for driving the push rod to move is arranged above the balancing chamber, and the manual drive structure includes a sleeve sleeved on the end of the push rod, a locking structure arranged at the connection between the two to realize the positioning switching of the two, and a handheld drive component installed on the frame; the handheld drive component is connected to the end of the sleeve through a transmission assembly; when pneumatically driven, the locking structure cancels the positioning, and the sleeve and the push rod can slide relative to each other; when hand-held driven, the locking structure locks the positioning, and the sleeve and the push rod are in a positioning state.

[0007] According to the pneumatic diaphragm double-drive actuator of the utility model, the transmission assembly adopts an engaging transmission structure, which includes a gear structure distributed along the axial direction of the sleeve and a driving wheel engaged with the gear structure; the driving wheel is driven to rotate by a handheld driving member.

[0008] According to the pneumatic diaphragm head dual-drive actuator of the utility model, the end of the sleeve is a worm structure, and the driving wheel adopts a turbine structure.

[0009] According to the pneumatic diaphragm head dual-drive actuator of the utility model, the handheld drive member is a disc-shaped drive handle.

[0010] According to the pneumatic diaphragm head dual-drive actuator of the utility model, a balancing spring for providing a load force for the expansion of the expansion film is arranged on one side of the expansion film.

[0011] According to the pneumatic diaphragm head dual-drive actuator of the utility model, a tray is fixedly mounted on the side wall of the expansion film, one end of the balance spring is mounted on the tray, and the other end is connected to the side wall of the chamber.

[0012] According to the pneumatic diaphragm head dual-drive actuator of the utility model, it is characterized in that a guide component for guiding the expansion and contraction of the balance spring is fixedly installed on the side wall of the chamber.

[0013] According to the pneumatic diaphragm double-drive actuator of the utility model, the guide component is a guide column, which is placed inside the balance spring and fixed to the side wall of the chamber.

[0014] According to the pneumatic diaphragm head dual-drive actuator of the utility model, a plurality of balance bins are provided along the extension direction of the push rod; and adjacent balance bins are fixedly connected to each other.

[0015] According to the pneumatic diaphragm head dual-drive actuator of the utility model, the locking structure includes positioning holes correspondingly arranged on the sleeve and the push rod and positioning pins that can be inserted into the positioning holes.

[0016] The utility model provides a pneumatic diaphragm head dual-drive actuator, including a balance chamber with a chamber inside, a guide hole arranged on the side wall of the chamber, and a push rod moving along the guide hole direction; in this embodiment, the balance chamber is fixedly connected by an upper diaphragm cover and a lower diaphragm cover through bolts and nuts, and the push rod moves up and down in the vertical direction along the guide hole direction as shown in the figure, and the push rod is installed in the corresponding screw hole in the middle of the connecting half (the connecting half is an existing component, which is mainly used to measure the up and down movement of the push rod), and the lower part of the connecting half is connected to the valve core of the valve. The chamber is equipped with an expansion film connected to the push rod, and the expansion film is connected to an external air pressure supply component (usually an air pump) through an air port arranged on the side wall of the chamber. When controlling the flow rate in the valve, the air pressure supply component supplies air flow to the expansion film and expands it. The expanded expansion film further pushes the push rod up, and finally realizes the flow regulation of the valve (after the above operation, the opening of the valve will usually increase gradually, and the flow rate will increase), and the expansion degree of the expansion film is controlled to achieve precise flow regulation of the valve. A balance spring is provided on one side of the expansion film to provide a load force for its expansion, and the load force applied by the balance spring balances or weakens the expansion force of the expansion film. Among them, multiple groups of the balance springs can be arranged in the chamber. In order to ensure the installation of multiple groups of balance springs and the balance of load force, a tray is fixedly installed on the side wall of the expansion film. One end of the balance spring is installed on the tray, and the other end is connected to the side wall of the chamber. The utility model can realize switching between the dual drive modes of pneumatic and handheld drive, and effectively solves the problem that the pneumatic drive cannot work when the air pressure supply component is under maintenance, and the valve flow regulation is urgently needed. BRIEF DESCRIPTION OF THE DRAWINGS

[0017] Figure 1 It is a structural schematic diagram of the utility model;

[0018] Figure 2 It is a structural schematic diagram of the locking structure of the utility model;

[0019] In the figure, 1-guide hole, 11-balance chamber, 111-upper membrane cover, 112-lower membrane cover, 2-push rod, 21-positioning hole, 22-positioning pin, 23-guide protrusion, 3-expansion film, 31-air port, 4-drive handle, 5-balance spring, 6-tray, 7-guide component, 8-sleeve, 10-chamber. DETAILED DESCRIPTION

[0020] In order to make the purpose, technical solutions and advantages of the utility model more clearly understood, the utility model is further described in detail below in conjunction with the accompanying drawings and embodiments. It should be understood that the specific embodiments described here are only used to explain the utility model and are not used to limit the utility model.

[0021] See also Figure 1 and Figure 2 The utility model provides a pneumatic diaphragm head dual-drive actuator, which includes a balancing chamber 11 with an internal chamber, a guide hole 1 arranged on the side wall of the chamber 10 and a push rod 2 moving along the guide hole 1; in the present embodiment, the balancing chamber 11 is fixedly connected together by an upper diaphragm cover 111 and a lower diaphragm cover 112 by bolts and nuts, and the push rod 2 moves up and down in the vertical direction along the guide hole 1 as shown in the figure, and the push rod 2 is installed in the corresponding screw hole in the middle of the connecting half 11 (the connecting half 11 is an existing component, which is mainly used to measure the up and down movement of the push rod 2), and the lower part of the connecting half 11 is connected to the valve core of the valve.

[0022] The chamber 10 is provided with an expansion film 3 connected to the push rod 2, and the expansion film 3 is connected to an external air pressure supply component (usually an air pump) through an air port 31 provided on the side wall of the chamber 10. When controlling the flow rate in the valve, the air pressure supply component supplies airflow to the expansion film 3 and expands it, and the expanded expansion film 3 further pushes the push rod 2 upward, and finally realizes the flow regulation of the valve (after the above operation, the opening of the valve will usually increase gradually, and the flow rate will increase), and the expansion degree of the expansion film 3 is controlled to achieve precise flow regulation of the valve. A balance spring 5 is provided on one side of the expansion film 3 to provide a load force for its expansion, and the load force applied by the balance spring 5 balances or weakens the expansion force of the expansion film 3. Among them, multiple groups of the balance springs 5 ​​can be provided in the chamber 10. In order to ensure the installation of multiple groups of balance springs 5 ​​and the balance of load force, a tray 6 is fixedly installed on the side wall of the expansion film, and one end of the balance spring is installed on the tray 6, and the other end is connected to the side wall of the chamber.

[0023] In addition, in order to further increase the load and realize accurate flow regulation of the valve, the balancing chamber 11 is provided with multiple groups along the extension direction of the push rod 2. Specifically, in this embodiment, two groups of balancing chambers 11 are provided; the structures in each group of balancing chambers 11 are consistent, and adjacent balancing chambers 11 are fixedly connected to each other. When the air pressure supply assembly is supplying airflow, it is preferred that a single balancing chamber 11 is supplied sequentially (for example, one by one from bottom to top).

[0024] Preferably, in order to ensure the directional positioning of the balance spring 5 during the compression process and to prevent the balance spring 5 from partially expanding outward during the compression process, thereby reducing the load force of the balance spring 5, a guide component 7 for guiding the expansion and contraction of the balance spring 5 is fixedly installed on the side wall of the chamber 10. The guide component 7 may be a columnar structure or a sleeve-shaped structure. Specifically, in this embodiment, the guide component 7 is a guide column, which is placed inside the balance spring 5 and fixedly connected to the side wall of the chamber 10 (specifically, fixedly connected to the upper membrane cover 111 by long bolts).

[0025] A manual driving structure for driving the push rod 2 to move is arranged above the balance chamber 11. When the air pressure supply component (usually an air pump) is in a maintenance state, the manual driving structure manually drives the push rod 2 to move, and further adjusts the flow rate of the valve. The manual driving structure includes a sleeve 8 sleeved on the end of the push rod 2 (in this embodiment, the sleeve 8 is sleeved on the outside of the push rod 2), a locking structure arranged at the connection between the two to realize the positioning switching of the two, and a handheld driving member installed on the frame; specifically, in this embodiment, the locking structure includes a positioning hole 21 correspondingly arranged on the sleeve 8 and the push rod 2 and a positioning pin 22 that can be inserted into the positioning hole 21; the positioning hole 21 can be arranged in multiple groups to facilitate the positioning of the positioning pin 22. In order to ensure the corresponding overlap of the positioning holes 21, the sleeve 8 is rotated and positioned by the positioning structure during the up and down movement (it cannot rotate around the axis), and the positioning structure can be positioned by the guide protrusion 23 with edges and the corresponding guide groove.

[0026] During pneumatic drive, the locking structure cancels the positioning (the positioning pin 22 is pulled out, and the sleeve 8 and the push rod 2 can move relative to each other), and the sleeve 8 and the push rod 2 can slide relative to each other; at this time, the expansion of the expansion film 3 will not be restricted by the manual driving structure during the process of driving the push rod 2 to move, that is, the manual driving structure will not hinder the movement of the push rod 2.

[0027] When the hand-held drive is used, the locking structure is locked and positioned, and the sleeve 8 and the push rod 2 are in a positioned state (the positioning pin 22 is inserted, and the sleeve 8 and the push rod 2 cannot move relative to each other). At this time, the manual drive structure can drive the push rod 2 to move. Specifically, the hand-held drive member is connected to the end of the sleeve 8 through a transmission assembly; the transmission assembly adopts a meshing transmission structure, which includes a gear structure distributed along the axial direction of the sleeve 8 and a driving wheel meshed with the gear structure; the driving wheel is driven by the hand-held drive member to rotate.

[0028] Preferably, the transmission assembly of the utility model adopts a meshing transmission structure, which includes a gear structure distributed along the axial direction of the sleeve 8 and a driving wheel meshed with the gear structure; the driving wheel is driven to rotate by the handheld driving member. Furthermore, the end of the sleeve 8 is a worm structure, and the driving wheel adopts a turbine structure. Alternatively, the end of the sleeve 8 is set as a rack structure, and the driving wheel adopts a spur gear meshed therewith. The handheld driving member is a disc-shaped driving handle 4, which can be fixedly connected to the driving wheel concentrically through a transmission shaft.

[0029] It needs to be explained that, after adjustment, the height positioning of the push rod 2 is achieved by the resistance between the transmission shaft and the bracket on which it is installed.

[0030] In summary, the utility model provides a pneumatic diaphragm head dual-drive actuator, including a balance chamber with an internal chamber, a guide hole arranged on the side wall of the chamber, and a push rod moving along the guide hole; in this embodiment, the balance chamber is fixedly connected by an upper diaphragm cover and a lower diaphragm cover through bolts and nuts, and the push rod moves up and down in the vertical direction along the guide hole as shown in the figure, and the push rod is installed in the corresponding screw hole in the middle of the connecting half (the connecting half is an existing component, which is mainly used to measure the up and down movement of the push rod), and the lower part of the connecting half is connected to the valve core of the valve. The chamber is equipped with an expansion film connected to the push rod, and the expansion film is connected to an external air pressure supply component (usually an air pump) through an air port arranged on the side wall of the chamber. When controlling the flow rate in the valve, the air pressure supply component supplies air flow to the expansion film and expands it. The expanded expansion film further pushes the push rod up, and finally realizes the flow regulation of the valve (after the above operation, the opening of the valve will usually increase gradually, and the flow rate will increase), and the expansion degree of the expansion film is controlled to achieve precise flow regulation of the valve. A balance spring is provided on one side of the expansion film to provide a load force for its expansion, and the load force applied by the balance spring balances or weakens the expansion force of the expansion film. Among them, multiple groups of the balance springs can be arranged in the chamber. In order to ensure the installation of multiple groups of balance springs and the balance of load force, a tray is fixedly installed on the side wall of the expansion film. One end of the balance spring is installed on the tray, and the other end is connected to the side wall of the chamber. The utility model can realize switching between the dual drive modes of pneumatic and handheld drive, and effectively solves the problem that the pneumatic drive cannot work when the air pressure supply component is under maintenance, and the valve flow regulation is urgently needed.

[0031] Of course, the present invention may have many other embodiments. Without departing from the spirit and essence of the present invention, technicians familiar with the field can make various corresponding changes and deformations based on the present invention, but these corresponding changes and deformations should all fall within the scope of protection of the claims attached to the present invention.

Claims

1. A pneumatic diaphragm head dual-drive actuator, characterized in that: It includes a balance chamber with a chamber inside, a guide hole arranged on the side wall of the chamber, and a push rod moving along the direction of the guide hole; The chamber is equipped with an expansion film connected to the push rod; A manual driving structure for driving the push rod to move is arranged above the balance bin, and the manual driving structure comprises a sleeve sleeved on the end of the push rod, a locking structure arranged at the connection between the two to realize the positioning switching of the two, and a handheld driving member installed on the frame; The handheld driving member is connected to the end of the sleeve through a transmission assembly; When pneumatically driven, the locking structure cancels the positioning, and the sleeve and the push rod can slide relative to each other; When the device is driven by hand, the locking structure is locked and positioned, and the sleeve and the push rod are in a positioned state.

2. The pneumatic diaphragm double-drive actuator according to claim 1 is characterized in that: The transmission assembly adopts a meshing transmission structure, which includes a gear structure distributed along the axial direction of the sleeve and a driving wheel meshed with the gear structure; the driving wheel is driven by the handheld driving member to rotate.

3. The pneumatic diaphragm double-drive actuator according to claim 2 is characterized in that: The end of the sleeve is a worm structure, and the driving wheel adopts a turbine structure.

4. The pneumatic diaphragm double-drive actuator according to any one of claims 1 to 3, characterized in that: The handheld driving member is a disc-shaped driving handle.

5. The pneumatic diaphragm double-drive actuator according to claim 1, characterized in that: A balancing spring is arranged on one side of the expansion film to provide a load force for its expansion.

6. The pneumatic diaphragm double-drive actuator according to claim 5, characterized in that: A tray is fixedly mounted on the side wall of the expansion film, one end of the balance spring is mounted on the tray, and the other end is connected to the side wall of the chamber.

7. The pneumatic diaphragm double-drive actuator according to claim 5 or 6, characterized in that: A guide component for guiding the expansion and contraction of the balance spring is fixedly mounted on the side wall of the chamber.

8. The pneumatic diaphragm double-drive actuator according to claim 7, characterized in that: The guide component is a guide column, which is placed inside the balance spring and fixed to the side wall of the chamber.

9. The pneumatic diaphragm double-drive actuator according to claim 1, characterized in that: The balancing bins are arranged in multiple groups along the extension direction of the push rod; adjacent balancing bins are fixedly connected to each other.

10. The pneumatic diaphragm double-drive actuator according to claim 1, characterized in that: The locking structure comprises positioning holes correspondingly arranged on the sleeve and the push rod and positioning pins which can be inserted into the positioning holes.

Images