Angular travel film type actuating mechanism

Abstract

The invention provides an angular travel film type executing mechanism which comprises a shell assembly, the left side and the right side of the upper portion of the shell assembly are connected with an upper film cover through hexagon head screws and hexagon nuts, a film is arranged on the lower portion of the upper film cover, a film plate is installed on the lower portion of the film, and the middle of the film plate is connected with the upper end face of a film rod assembly through hexagon head screws; the design is compact, the appearance is small, the packaging size of the valve and the executing mechanism is small, the installation flexibility of the valve and the executing mechanism in a small rack and a large process pipeline is enhanced, and therefore precious time is saved; the idle stroke is reduced by tightening the connecting rod, the connecting rod is tightened to the spline valve shaft, the dead zone between the executing mechanism and the valve can be reduced through single-point connection, and the accumulated dead zone of the rotary control valve can be controlled within the range smaller than 0.5%.

Description

Technical Field

[0001] The present invention relates to the technical field of actuators, and in particular to an angular travel diaphragm actuator. Background Art

[0002] Pneumatic diaphragm type angular travel is a common actuator in industrial automation control, mainly used for the opening angle of throttle valves or baffles. Its core principle is to use air pressure to push the diaphragm to generate thrust, and then convert this force into rotational action. Its structure is mainly divided into diaphragm chamber, push rod, spring group, feedback mechanism.

[0003] The diaphragm chamber is equivalent to the power source of the entire system. It contains a flexible film made of rubber or metal. When the control signal is given, compressed air will enter one side of the diaphragm chamber. At this time, the film begins to deform under the action of air pressure, pushing the push rod to produce linear displacement. This linear motion will not be directly transmitted to the valve, but through a specially designed gear set to convert the linear push and pull into a 90-degree rotational motion. This is the origin of the name "angular travel".

[0004] Patent No. CN111520527A discloses a large torque dual diaphragm angular stroke actuator, including a positive diaphragm actuator (A), a crank transmission box, and a reaction diaphragm actuator (B) arranged and installed in sequence from left to right, and the left and right actuators are respectively composed of a support frame, a diaphragm front cover, a diaphragm rear cover, a diaphragm and a reset spring group, which are installed in sequence under the fixation of fastening bolts; the present invention proposes a pneumatic angular stroke diaphragm actuator with high motion accuracy, simple and reliable structural design, and large output torque, which can be used with various angular stroke control valves, especially large-diameter angular stroke valves with large valve opening torque. The present invention is ingeniously designed, simple in structure, and low in production cost. It can be well matched with various angular stroke valves, and compared with traditional diaphragm angular stroke actuators, the output torque of the present invention can be greatly improved, and the output accuracy can be guaranteed under high torque conditions.

[0005] However, the patent technology still has the following problems: the actuator in the above document transmits the thrust to the fork crank 8 through the limit slider 11, and the fork crank 13 rotates around its own center line to output torque. When the pneumatic output is in progress, the force needs to be first transmitted to the slider, and then the slider is pushed to overcome the resistance of the slider, and then transmitted to the fork crank to make it rotate. During the transmission process, the thrust of the gas will be greatly consumed, so that the fork crank cannot reach the desired angle when rotating, thereby affecting the opening of the valve and reducing the control accuracy of the valve. Summary of the invention

[0006] In view of the above technical problems, the present invention provides an angular travel diaphragm actuator with improved adjustment accuracy.

[0007] The present invention provides an angular travel diaphragm actuator, comprising a housing assembly, characterized in that the upper left and right parts of the housing assembly are connected to an upper diaphragm cover by hexagonal screws and hexagonal nuts, a diaphragm is arranged at the lower part of the upper diaphragm cover, a diaphragm plate is installed at the lower part of the diaphragm, the middle part of the diaphragm plate is connected to the upper end surface of a diaphragm rod assembly by a hexagonal screw, the outer side of the lower part of the diaphragm rod assembly is connected to a guide assembly, an inner spring is sleeved on the outer side of the guide assembly, an outer spring is arranged on the outer side of the inner spring, the bottom end of the diaphragm rod assembly is rotatably connected to a connecting rod, the connecting rod is connected to a spline valve shaft, the middle part of the spline valve shaft is connected to a limit plate, one end of the limit plate is in contact with another hexagonal screw, and the hexagonal screw is connected to the bottom end of the housing assembly by a hexagonal nut.

[0008] The connecting rod is a U-shaped rod, and the spline valve shaft is an I-shaped rod.

[0009] A thread is arranged on the outer side of the guide assembly, and the inner spring contacts the thread to adjust the preload force of the inner spring.

[0010] An air source inlet is provided through the middle of the upper membrane cover so that the air source device can transport gas to the inside of the device through the air source inlet.

[0011] The left and right ends of the diaphragm are clamped and fixed at the positions where the housing component and the upper mold cover are in contact and connected.

[0012] A guide assembly is arranged at the middle part of the inner side of the shell assembly, an outer spring installation groove is arranged inside the shell assembly and beside the guide assembly, and the lower part of the outer spring is installed in the outer spring installation groove.

[0013] An inner spring installation groove and an outer spring installation groove are respectively arranged at the bottom of the diaphragm plate, and the upper part of the outer spring is installed in the outer spring installation groove.

[0014] The upper part of the inner spring is arranged in the inner spring installation groove, and the lower part of the inner spring is arranged in the gap between the guide component and the outer wall of the outer spring installation groove of the shell component.

[0015] The diaphragm rod assembly is slidably connected to the guide assembly, and the diaphragm rod assembly can slide up and down in the middle of the guide assembly.

[0016] The side walls of the housing assembly located on the left and right sides of the connecting rod are connected with a cover plate through a hexagonal head screw and a hexagonal nut.

[0017] The beneficial effects of the present invention are as follows: the present invention is an angular stroke diaphragm actuator with a compact design and a small appearance. The package size of the valve and the actuator is small, which is conducive to enhancing its installation flexibility in small benches and large process pipelines, thereby saving valuable time; by tightening the connecting rod to reduce the idle stroke, the connecting rod is tightened to the spline valve shaft. This single-point connection can reduce the dead zone between the actuator and the valve, and the cumulative dead zone of the rotary control valve can be controlled within a range of less than 0.5%; the right or left installation style can be adopted during installation, and the operating mode of the actuator and the valve assembly can be converted from air supply opening to air supply closing type, and vice versa, without using other parts; the installation operation is convenient, and the operating mode can be selected according to the actual application, increasing the selection range; equipped with an adjustable stroke limit, the hexagon head screw at the bottom of the housing assembly can be adjusted to drive the limit plate to rise or move down, thereby achieving the minimum opening of the external valve is not 0, so as to be suitable for the working condition of the normally open valve. BRIEF DESCRIPTION OF THE DRAWINGS

[0018] Figure 1 It is a schematic diagram of the internal structure of the present invention.

[0019] Figure markings: 1-housing assembly; 2-cover plate; 3-limiting plate; 4-spline valve shaft; 5-upper diaphragm cover; 51-air source inlet; 6-diaphragm plate; 8-hexagonal head screw; 9-hexagonal nut; 10-diaphragm rod assembly; 11-diaphragm; 12-inner spring; 13-outer spring; 14-connecting rod; 48-guide assembly. DETAILED DESCRIPTION

[0020] Example 1

[0021] The technical solution of the present invention will be clearly and completely described below in conjunction with the accompanying drawings of the present invention.

[0022] like Figure 1 As shown, the present invention provides an angular stroke diaphragm actuator, including a housing assembly 1, characterized in that the upper left and right parts of the housing assembly 1 are connected to the upper diaphragm cover 5 by hexagonal screws 8 and hexagonal nuts 9, a diaphragm 11 is arranged at the lower part of the upper diaphragm cover 5, a diaphragm plate 6 is installed at the lower part of the diaphragm 11, the middle part of the diaphragm plate 6 is connected to the upper end surface of the diaphragm rod assembly 10 by the hexagonal screw 8, the outer side of the lower part of the diaphragm rod assembly 10 is connected to the guide assembly 48, the outer side of the guide assembly 48 is sleeved and arranged with an inner spring 12, the outer side of the inner spring 12 is arranged with an outer spring 13, the bottom end of the diaphragm rod assembly 10 is rotatably connected to the connecting rod 14, the connecting rod 14 is connected to the spline valve shaft 4, a limit plate 3 is arranged in the middle part of the spline valve shaft 4, one end of the limit plate 3 is in contact with another hexagonal screw 8, and the hexagonal screw 8 is fixed to the bottom end of the housing assembly 1 by the hexagonal nut 9.

[0023] The connecting rod 14 is a U-shaped rod, and the spline valve shaft 4 is an I-shaped rod.

[0024] A thread is disposed on the outer side of the guide assembly 48 , and the inner spring 12 contacts the thread to adjust the preload force of the inner spring 12 .

[0025] An air source inlet 51 is provided through the middle of the upper membrane cover 5 so that the air source device can transport gas to the inside of the device through the air source inlet.

[0026] The left and right ends of the diaphragm 11 are clamped and fixed at the positions where the housing assembly 1 and the upper mold cover 5 are in contact and connected.

[0027] A guide assembly 48 is provided in the middle of the inner side of the housing assembly 1 , and an outer spring installation groove is provided inside the housing assembly and beside the guide assembly 48 , into which the lower part of the outer spring 13 is installed.

[0028] An inner spring mounting groove and an outer spring mounting groove are respectively arranged at the bottom of the diaphragm plate 6, and the upper part of the outer spring 13 is installed in the outer spring mounting groove.

[0029] The upper portion of the inner spring 12 is arranged in the inner spring installation groove, and the lower portion of the inner spring 12 is arranged in the gap between the guide assembly 48 and the outer wall of the outer spring installation groove of the housing assembly 1 .

[0030] The diaphragm rod assembly 10 is slidably connected to the guide assembly 48 , and the diaphragm rod assembly 10 can slide up and down in the middle of the guide assembly 48 .

[0031] The cover plate 2 is connected to the side wall of the housing assembly 1 located on the left and right sides of the connecting rod 14 through a hexagonal head screw 8 and a hexagonal nut 9.

[0032] Example 2

[0033] When the present invention is in use, an external valve is connected to the spline valve shaft 4 of the device, so that the actuator of the device drives the valve to open and close.

[0034] The specific implementation operation is: the air source air inlet 51 on the upper membrane cover 5 is connected to an external air supply mechanism, and the air supply mechanism vents air into the upper membrane cover 5. At this time, the gas enters the top cavity of the upper membrane cover 5 through the air source air inlet 51. Due to the limited cavity space and the setting of the air supply pressure, the gas directly acts on the diaphragm 11 to push the diaphragm 11. Figure 1As shown, at this time, the diaphragm 11 moves downward under the push of the gas, driving the diaphragm plate 6 to move downward, thereby driving the outer spring 13 and the inner spring 12 to contract, thereby driving the diaphragm rod assembly 10 to move downward. Since the diaphragm rod assembly 10 is rotatably connected to the connecting rod 14, the limit plate 3 arranged opposite to the rotating rod 14 rests on the hexagon head screw 8. The diaphragm rod assembly 10 moves downward, so that the connecting rod 14 drives the spline valve shaft 4 to realize an arc movement at the position where the hexagon head screw 8 and the limit plate 2 are connected, thereby realizing that the rotation of the spline valve shaft 4 drives the external valve to rotate, so that the external valve opening is at any angle of 0-90 degrees, thereby improving the control accuracy of the valve.

[0035] In addition, the hexagon head screw 8 at the bottom of the rotating housing assembly 1, that is, in contact with the limit plate 3, can be moved up or down, so that the limit plate 3 drives the spline valve shaft 4 to rotate at a small angle, and the adjustable range is 10-20 degrees, so that the valve is in a normally open state at any opening angle between 10 and 20 degrees, which is suitable for normally open working under certain working conditions.

[0036] The above shows and describes the basic principles and main features of the present invention and the advantages of the present invention. The various components mentioned in the present invention are common technologies in the existing field. Those skilled in the art should understand that the present invention is not limited to the above embodiments. The above embodiments and descriptions are only to illustrate the principles of the present invention. Without departing from the spirit and scope of the present invention, the present invention may have various changes and improvements, which fall within the scope of the present invention to be protected. The scope of protection claimed by the present invention is defined by the attached claims and their equivalents.

Claims

1. An angular travel diaphragm actuator, characterized in that It includes a shell assembly, the upper left and right parts of the shell assembly are connected to the upper diaphragm cover by hexagonal screws and hexagonal nuts, a diaphragm is arranged at the lower part of the upper diaphragm cover, a diaphragm plate is installed at the lower part of the diaphragm, the middle part of the diaphragm plate is connected to the upper end surface of the diaphragm rod assembly by hexagonal screws, the outer side of the lower part of the diaphragm rod assembly is connected to the guide assembly, the outer side of the guide assembly is sleeved with an inner spring, the outer side of the inner spring is arranged, the bottom end of the diaphragm rod assembly is rotatably connected to a connecting rod, the connecting rod is connected to a spline valve shaft, the middle part of the spline valve shaft is connected to a limit plate, one end of the limit plate is in contact with another hexagonal screw, and the hexagonal screw is connected to the bottom end of the shell assembly by a hexagonal nut.

2. The angular stroke diaphragm actuator according to claim 1, characterized in that The connecting rod is a U-shaped rod, and the spline valve shaft is an I-shaped rod.

3. The angular travel diaphragm actuator according to claim 1, characterized in that A thread is arranged on the outer side of the guide assembly, and the inner spring contacts the thread.

4. The angular travel diaphragm actuator according to claim 1, characterized in that An air source air inlet is arranged through the middle of the upper membrane cover.

5. The angular travel diaphragm actuator according to claim 1, characterized in that The left and right ends of the diaphragm are clamped and fixed at the positions where the housing component and the upper mold cover are in contact and connected.

6. The angular stroke diaphragm actuator according to claim 1, characterized in that A guide assembly is arranged at the middle part of the inner side of the shell assembly, an outer spring installation groove is arranged inside the shell assembly and beside the guide assembly, and the lower part of the outer spring is installed in the outer spring installation groove.

7. The angular travel diaphragm actuator according to claim 6, characterized in that An inner spring mounting groove and an outer spring mounting groove are respectively arranged at the bottom of the diaphragm plate, and the upper part of the outer spring is installed in the outer spring mounting groove; the upper part of the inner spring is arranged in the inner spring mounting groove, and the lower part of the inner spring is arranged in the gap between the outer wall of the outer spring mounting groove of the guide assembly and the outer shell assembly.

8. The angular travel diaphragm actuator according to claim 1, characterized in that The diaphragm rod assembly is slidably connected to the guide assembly, and the diaphragm rod assembly can slide up and down in the middle of the guide assembly.

9. The angular stroke diaphragm actuator according to claim 1, characterized in that The side walls of the housing assembly located on the left and right sides of the connecting rod are connected with a cover plate through a hexagonal head screw and a hexagonal nut.

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