CN112797191A

CN112797191A - Multi-way pneumatic rotary valve

Info

Publication number: CN112797191A
Application number: CN202110130496.4A
Authority: CN
Inventors: 胡进平; 肖敏; 陆正元
Original assignee: Individual
Current assignee: Individual
Priority date: 2021-01-29
Filing date: 2021-01-29
Publication date: 2021-05-14

Abstract

The invention relates to an improvement of a 24-way rotary valve, in particular to a multi-way pneumatic rotary valve. The multi-way pneumatic rotary valve comprises a multi-way rotary valve body assembly and a stuffing box; a stuffing box sealing structure connected with the multi-way rotary valve body assembly and used for sealing the stuffing box is arranged above the multi-way rotary valve body assembly; an upper driving shaft arranged on the multi-way rotary valve body assembly penetrates through the stuffing box sealing mechanism to extend upwards and is connected with a gear transmission mechanism, and the gear transmission mechanism drives the upper driving shaft to rotate; the pneumatic driving mechanism is connected with the gear transmission mechanism and controls the gear transmission mechanism to work; and a position feedback mechanism connected with the pneumatic driving mechanism and used for feeding back the rotation of the gear transmission mechanism is arranged above the pneumatic driving mechanism. The multi-way pneumatic rotary valve has the advantages of small occupied area and high stability.

Description

Multi-way pneumatic rotary valve

Technical Field

The invention relates to an improvement of a 24-way rotary valve, in particular to a multi-way pneumatic rotary valve.

Background

A simulated moving bed molecular sieve adsorption separation process is an advanced and efficient chemical adsorption separation process, and is characterized in that an adsorbent (molecular sieve) is filled on 24 fixed beds of an adsorption tower, and the material inlet and outlet of each bed of the adsorption tower are continuously switched by a 24-way rotary valve at certain time intervals. This process corresponds to the movement of the adsorbent (molecular sieve) within the adsorption column and is therefore referred to as a simulated moving bed. The 24-way rotary valve is a special valve developed for the simulated moving bed molecular sieve adsorption separation process.

In the past decades, petrochemical enterprises in China successively imported a plurality of 24-way rotary valves with the introduction of UOP advanced simulated moving bed molecular sieve adsorption separation process technology and have been used domestically.

In order to popularize and apply advanced simulated moving bed molecular sieve adsorption separation process technology, reduce investment cost, improve enterprise operation benefit and promote petrochemical technology progress, China general petrochemical company reaches '24-way rotary valve scientific research and customs' national key projects in 1997.

The successful development of the 24-way rotary valve thoroughly changes the understanding and thinking of people on the traditional valve and changes the valve as a pipeline fitting into petrochemical core equipment.

Up to now, the 24-way rotary valve used at home and abroad is driven by a hydraulic mode, namely, the 24-way hydraulic rotary valve is called. The 24-way hydraulic rotary valve has the advantages of complex structure, large floor area, high cost, high energy consumption, easy generation of problems of environmental pollution, fire and the like due to possible oil leakage of a hydraulic system.

Disclosure of Invention

The invention aims to provide a multi-way pneumatic rotary valve which can solve the technical problems;

the invention provides a multi-way pneumatic rotary valve which comprises a multi-way rotary valve body assembly and a stuffing box; a stuffing box sealing structure connected with the multi-way rotary valve body assembly and used for sealing the stuffing box is arranged above the multi-way rotary valve body assembly; an upper driving shaft arranged on the multi-way rotary valve body assembly penetrates through the stuffing box sealing mechanism to extend upwards and is connected with a gear transmission mechanism, and the gear transmission mechanism drives the upper driving shaft to rotate; the pneumatic driving mechanism is connected with the gear transmission mechanism and controls the gear transmission mechanism to work; and a position feedback mechanism connected with the pneumatic driving mechanism and used for feeding back the rotation of the gear transmission mechanism is arranged above the pneumatic driving mechanism.

Wherein, many lead to rotary valve body subassembly includes: the valve cover, the coupling, the lower driving shaft, the rotary disc and the fixed disc; an upper driving shaft is arranged in the valve cover; the upper end of the upper driving shaft is connected with a gear transmission mechanism, and the lower end of the upper driving shaft is connected with the lower driving shaft through the coupling; the lower driving shaft is connected with a turntable; the fixed disc is arranged below the valve cover, and the fixed disc is connected with the valve cover.

Wherein, the stuffing box seal structure includes: the device comprises an installation support, a valve position disc, a valve position pointer, a packing gland, an upper packing ring, a packing seat and a lower packing ring; a valve position disc is arranged in the mounting bracket, is sleeved on the upper driving shaft and synchronously rotates with the upper driving shaft; valve position pointers are arranged outside the valve position disc at intervals in the horizontal direction; the lower part of the valve position pointer is fixed on the packing gland; a packing gland is fixedly connected above the packing seat, a valve bonnet is fixedly connected below the packing seat, and a liquid discharge port and an exhaust port are respectively arranged on two sides of the packing seat; the liquid outlet and the air outlet are respectively communicated with the outside of the upper driving shaft through a channel arranged on the packing seat; an upper packing ring sleeved outside the upper driving shaft is arranged above the end part of the channel connected with the liquid discharge port; a lower packing ring sleeved outside the upper driving shaft is arranged above the end part of the channel connected with the exhaust port; and a spacing ring for spacing the upper packing ring and the lower packing ring is arranged between the upper packing ring and the lower packing ring.

Wherein, a guide sleeve is arranged inside the packing gland; the upper driving shaft penetrates through the guide sleeve.

Wherein, the uide bushing is copper uide bushing.

Wherein, gear drive includes: the device comprises a sun wheel, a planet wheel, an inner gear ring, a planet wheel support with a ratchet wheel, a pawl component, an upper cover, a lower cover and a cylinder mounting plate; a plurality of planet wheels are arranged around the sun wheel; the outer edges of the planet wheels are in toothed connection with the inner gear ring; the planet wheel support with the ratchet wheel is arranged below the planet wheel and used for supporting the planet wheel; a pawl component is arranged on the planet wheel support with the ratchet wheel; the pawl component is in toothed connection with the inner gear ring of the ratchet wheel; the upper cover is arranged at the upper end part of the inner gear ring, and the lower cover is arranged at the lower end part of the inner gear ring; and an air cylinder mounting plate used for being connected with the pneumatic driving mechanism is also arranged above the upper cover.

Wherein the pawl assembly comprises a plurality of pawls; the pawls are meshed with the ratchet internal gear ring; a pawl assembly is coupled to the upper drive shaft.

Wherein the pneumatic drive mechanism comprises: the device comprises a rotary cylinder, a pneumatic control valve, an electromagnetic valve, a filtering pressure reducing valve and a manual valve; the rotary cylinder is connected with a pneumatic control valve; the pneumatic control valve is connected with the electromagnetic valve, the manual valve and the filtering pressure reducing valve.

Wherein a rotating cylinder transmission shaft is arranged on the rotating cylinder; the center of the transmission shaft of the rotary cylinder is provided with a center hole; the rotary cylinder is a kenonatt blade type rotary cylinder.

Wherein the position feedback mechanism comprises: the device comprises a proximity switch, a position feedback mechanism transmission shaft and an induction block; the position feedback mechanism transmission shaft penetrates through the central hole in the rotary cylinder transmission shaft and a central hole formed in the center of the sun wheel and is connected with the pawl assembly; the number of the induction blocks is two, one induction block is arranged on a transmission shaft of the rotary cylinder, and the other induction block is arranged on a transmission shaft of the position feedback mechanism; the proximity switches are arranged around the induction block.

The multi-way pneumatic rotary valve has the beneficial effects that: has the advantages of small occupied area and high stability.

The multi-way pneumatic rotary valve further has the following beneficial effects:

a kenna blade type rotating cylinder with a very long service life is selected and a pneumatic accessory with quick action is configured, so that the pneumatic driving speed is superior to that of hydraulic driving; the invention discloses a gear transmission mechanism with a planetary gear speed reducing mechanism and a ratchet wheel pawl stepping mechanism integrated, which greatly increases the output torque and stepping positioning precision of a rotary cylinder, eliminates unbalanced force and enables the rotary valve to act more stably; the driving shaft of the rotary valve is creatively led to the top of the rotary cylinder, so that the real-time detection of 24 positions of the 24-way rotary valve is realized; in addition, a complete packing sealing structure is designed for the rotary valve, a mechanical sealing structure is completely replaced, and potential safety hazards are thoroughly eliminated; all parts adopt closed structures, and daily maintenance is completely omitted. The hydraulic oil leakage problem of the hydraulic system is avoided, and the environmental pollution and potential safety hazard of the hydraulic system are completely eliminated. In view of the particular advantages of a 24-way hydraulic rotary valve, the 24-way hydraulic rotary valve used on site is upgraded and modified into the 24-way hydraulic rotary valve in the near future, which brings real benefits to petrochemical enterprises.

Drawings

In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the drawings used in the description of the embodiments or the prior art will be briefly described below, and it is obvious that the drawings in the following description are some embodiments of the present invention, and other drawings can be obtained by those skilled in the art without creative efforts.

FIG. 1 is a schematic view of the overall structure of a multi-way pneumatic rotary valve according to the present invention;

FIG. 2 is a schematic diagram of a 24-way rotary valve body assembly of a multi-way pneumatic rotary valve of the present invention;

FIG. 3 is a schematic structural view of a stuffing box sealing structure of a multi-way pneumatic rotary valve according to the present invention;

FIG. 4 is a schematic structural view of a gear transmission mechanism of a multi-way pneumatic rotary valve according to the present invention;

FIG. 5 is an external view of FIG. 4;

FIG. 6 is a schematic view of the planetary gear arrangement of the gear assembly of FIG. 4;

FIG. 7 is a schematic view of the pawl assembly arrangement of FIG. 4;

FIG. 8 is a schematic view of a pneumatic actuator of a multi-way pneumatic rotary valve according to the present invention;

FIG. 9 is a top view of FIG. 8;

FIG. 10 is a schematic view of a position feedback mechanism for a multi-way pneumatic rotary valve according to the present invention;

fig. 11 is a top view of fig. 10.

Description of reference numerals:

1. a 24-way rotary valve body assembly; 11. a valve housing; 111. an upper flange and a lower flange; 112. a barrel; 113. sealing the end; 114. lifting lugs; 115. sealant inlet and outlet flanges; 116. a valve position viewing port; 12. a coupling; 13. a lower drive shaft; 14. a turntable; 15. fixing a disc; 16. an upper drive shaft;

2. a stuffing box sealing structure; 21. mounting a bracket; 22. a valve position disk; 23. a valve position pointer; 24. a packing gland; 25. a packing ring is arranged; 26. a filler seat; 27. a lower packing ring; 28. a spacing ring; 29. a liquid discharge port; 291. an exhaust port;

3. a gear transmission mechanism; 31. a sun gear; 32. a planet wheel; 33. an inner gear ring; 34. a planet wheel support with a ratchet wheel; 35. a pawl assembly; 36. an upper cover; 37. a lower cover; 38. a cylinder mounting plate;

4. a pneumatic drive mechanism; 41. a rotating cylinder; 411. rotating the cylinder drive shaft; 412. a central bore; 42. a pneumatic control valve; 43. an electromagnetic valve; 44. a filtering pressure reducing valve; 45. a manual valve;

5. a position feedback mechanism; 51. a proximity switch; 52. a position feedback mechanism drive shaft; 53. an induction block; 54. an aviation plug.

Detailed Description

The technical solutions of the present invention will be described clearly and completely with reference to the following embodiments, and it should be understood that the described embodiments are some, but not all, embodiments of the present invention. All other embodiments, which can be derived by a person skilled in the art from the embodiments given herein without making any creative effort, shall fall within the protection scope of the present invention.

In the description of the present invention, it is to be understood that the terms "center", "longitudinal", "lateral", "length", "width", "thickness", "upper", "lower", "front", "rear", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer", "clockwise", "counterclockwise", and the like, indicate orientations and positional relationships based on those shown in the drawings, and are used only for convenience of description and simplicity of description, and do not indicate or imply that the device or element being referred to must have a particular orientation, be constructed and operated in a particular orientation, and thus, should not be considered as limiting the present invention.

Furthermore, the terms "first", "second" and "first" are used for descriptive purposes only and are not to be construed as indicating or implying relative importance or implicitly indicating the number of technical features indicated. Thus, features defined as "first", "second", may explicitly or implicitly include one or more of the described features. In the description of the present invention, "a plurality" means two or more unless specifically defined otherwise. Furthermore, the terms "mounted," "connected," and "connected" are to be construed broadly and may, for example, be fixedly connected, detachably connected, or integrally connected; can be mechanically or electrically connected; they may be connected directly or indirectly through intervening media, or they may be interconnected between two elements. The specific meanings of the above terms in the present invention can be understood in specific cases to those skilled in the art.

Referring to fig. 1-11, a 24-way rotary valve is used as an example to illustrate the embodiment:

the 24-way rotary valve comprises a 24-way rotary valve body assembly 1, a stuffing box sealing structure 2, a gear transmission mechanism 3, a pneumatic driving mechanism 4 and a position feedback mechanism 5.

A stuffing box sealing structure 2 connected with the multi-way rotary valve body assembly and used for sealing the upper driving shaft 16 is arranged above the multi-way rotary valve body assembly; an upper driving shaft 16 arranged on the multi-way rotary valve body assembly penetrates through the stuffing box sealing mechanism to extend upwards and is connected with the gear transmission mechanism 3, and the gear transmission mechanism 3 drives the upper driving shaft 16 to rotate; the pneumatic driving mechanism 4 which is connected with the gear transmission mechanism 3 and controls the gear transmission mechanism 3 to work is arranged above the gear transmission mechanism 3; and a position feedback mechanism 5 connected with the pneumatic driving mechanism 4 and used for feeding back the rotation of the gear transmission mechanism 3 is arranged above the pneumatic driving mechanism 4.

Specifically, the 24-way rotary valve body assembly 1 comprises: a valve cover 11, a coupling 12, a lower driving shaft 13, a rotary disc 14 and a fixed disc 15; an upper driving shaft 16 is arranged in the valve cover 11; the upper end of the upper driving shaft 16 is connected with the gear transmission mechanism 3, and the lower end is connected with the lower driving shaft 13 through the coupling 12; the lower driving shaft 13 is connected with a rotary disc 14; the fixed disc 15 is arranged below the valve cover 11, and the fixed disc 15 is connected with the valve cover 11; the working end of the lower drive shaft is disposed within the fixed plate 15.

The 24 process pipes on the fixed plate 15 are respectively connected with 24 bed layers of the adsorption tower. The rotary disc 14 rotates anticlockwise to step under the driving of the lower driving shaft 13, each circle stays at 24 positions, materials in 7 material pipes are distributed into 24 process pipes according to process requirements, and then the materials are conveyed to corresponding bed layers of the adsorption tower.

The valve housing 11 is formed by welding an upper flange 111, a lower flange 111, a cylinder 112 and a seal head 113. The mounting lug 114, a sealant inlet and outlet flange 115, a sealant discharging flange, a valve position viewing port 116 and three mounting auxiliary flanges are arranged on the sealing device. The valve housing 11 provides an enclosed interior for the rotating disk 14, upper drive shaft 16, lower drive shaft 13 and coupling 12. The sealant enters the cavity of the valve housing 11 through the sealant inlet and outlet flange 115 on the valve housing 11, and the sealing surface of the rotary disk 14 is pressed on the sealing surface of the fixed disk 15 by the pressure of the sealant, and necessary specific sealing pressure is provided for the sealing surface.

The rotary table 14 is composed of a round reinforced polytetrafluoroethylene sealing plate, a metal disc with a key slot and 7 metal cross pipes. 7 material fan-shaped holes distributed at the central position and 7 process holes distributed at the excircle are respectively connected by 7 metal cross pipes. The positions of 7 process holes distributed on the excircle determine the material distribution rule of the rotary valve.

The fixed plate 15 is formed by welding a metal disc with 24 process pipes and 7 material pipes (the structures of the 24 process pipes and the 7 material pipes are the prior art). The metal disc is provided with 7 concentric grooves and 24 fabrication holes distributed on the outer ring. Each channel is respectively communicated with 7 material pipelines. The materials input from the outside are input into the corresponding material grooves through the material pipes, and the output materials are also conveyed to the corresponding material pipes through the material grooves. The 24 process holes are respectively communicated with 24 beds of the adsorption tower through 24 process pipelines. The 7 process holes of the rotary disk 14 are communicated with the corresponding process holes of the fixed disk 15 through 7 holes on the sealing plate.

The lower drive shaft 13 is connected to the fixed plate 15 through a copper bush and is connected to the rotary plate 14 and the coupling 12 through keys, respectively. The upper drive shaft 16 is keyed to the coupling 12 and the gear train 3, respectively. The coupling 12 adopts a gear coupling 12, and the transmission error of an upper driving shaft 13 and a lower driving shaft 13 can be automatically adjusted in the operation process.

24-way rotary valve body assembly 1 action: the upper driving shaft 16 drives the lower driving shaft 13 through the coupling 12 under the driving of the gear transmission mechanism 3, and then drives the rotary table 14 to rotate counterclockwise. The upper drive shaft 16 is rotated 15 counterclockwise at intervals, thereby rotating the turntable 14 15 each time, so that there are 24 stop positions of the turntable 14 per revolution. At each stop position, 7 process holes on the rotary table 14 are respectively communicated with 7 process holes on the fixed table 15, and other 17 holes on the fixed table 15 are blocked by a sealing plate on the rotary table 14. The input materials enter the groove of the fixed disc 15 through the material pipe, enter the straddle through the fan-shaped holes on the rotary disc 14, then enter the fabrication holes of the fixed disc 15 through the fabrication holes, and then enter the bed layer of the adsorption tower through the fabrication pipes of the fixed disc 15; the output materials are just opposite, and are output from the adsorption tower bed layer through a fixed disc 15 process pipeline, a fixed disc 15 process hole, a rotary disc 14 cross pipe, a rotary disc 14 sector opening, a fixed disc 15 groove and a fixed disc 15 material pipe.

The valve body of the rotary valve is reliable in operation, and the sealing plate made of reinforced polytetrafluoroethylene needs to be replaced regularly, and other parts have extremely long service lives. The life of the enhanced teflon sealing plate is affected by the flatness and smoothness of its own plane, the flatness and smoothness of the sealing surface of the stationary disk 15, the surface precision of the rotary disk 14, the pressure of the sealant, the composition of the medium, the service temperature of the valve, etc., and the general life has 3 to 5 years.

The power source of the 24-way rotary valve body assembly 1 is compressed gas, such as air, nitrogen and the like; the action of the 24-way rotary valve body component 1 is to rotate and step in one direction; the 24-way rotary valve body assembly 1 can stay at a plurality of positions in each circle, and the typical positions are 12 or 24, etc.; the 24-way rotary valve body assembly 1 has multiple materials in and out.

Specifically, the stuffing box sealing structure 2 includes: the device comprises a mounting bracket 21, a valve position disc 22, a valve position pointer 23, a packing gland 24, an upper packing ring 25, a packing seat 26 and a lower packing ring 27; a valve position disc 22 is arranged in the mounting bracket 21, the valve position disc 22 is sleeved on the upper driving shaft 16, and the valve position disc 22 and the upper driving shaft 16 rotate synchronously; valve position pointers 23 are arranged outside the valve position disc 22 at intervals in the horizontal direction; the lower part of the valve position pointer 23 is fixed on a packing gland 24; a packing gland 24 is fixedly connected above the packing seat 26, a valve cover 11 is fixedly connected below the packing seat, and a liquid outlet 29 and an exhaust port 291 are respectively arranged on two sides of the packing seat; the liquid outlet 29 and the air outlet 291 are respectively communicated with the outside of the upper driving shaft 16 through passages arranged on the packing seat 26; an upper packing ring 25 sleeved outside the upper driving shaft 16 is arranged above the end part of the channel connected with the liquid outlet 29; a lower packing ring 27 sleeved outside the upper driving shaft 16 is arranged above the end part of the channel connected with the exhaust port 291; and a spacing ring 28 for spacing the upper packing ring 25 and the lower packing ring 27 is arranged between the upper packing ring 25 and the lower packing ring 27.

The stuffing box is provided with an air outlet 291 and a liquid outlet 29 to ensure the sealing of the valve rod; completing valve site position indication through a valve position pointer 23; the stuffing box provides a mounting platform for the gear transmission mechanism 3.

Valve position disk 22 is fixed to upper drive shaft 16 for rotation with upper drive shaft 16 so that the actual position of the valve can be readily indicated in the field by valve position indicator 23. The packing seat 26 is provided with a packing leakage drainage liquid outlet 29 and an exhaust port 291, so that leakage liquid can be conveniently collected and output to a designated container through the liquid outlet 29 even if any leakage occurs in the packing. The packing adopts two layers of packing, namely an upper packing ring 25 and a lower packing ring 27, so as to ensure the sealing of the upper driving shaft 16. The packing gland is provided with a copper guide sleeve, and the upper driving shaft 16 penetrates through the guide sleeve to separate the upper driving shaft 16 from the packing gland. The packing seat 26 is fixed on the valve cover 11 through hinged screws, and the sealing between the packing seat 26 and the valve cover 11 adopts O-shaped ring sealing. Two half-rings are placed between the packing seat 26 and the valve housing 11 to prevent the upper drive shaft 16 from escaping during use. The mounting bracket 21 and the packing seat 26 are fixed by screws and pins to ensure tight connection between the mounting bracket and the packing seat. The packing sealing mechanism is simple and reliable in design, only needs little maintenance in the using process, only needs to observe whether the screw is loosened or not in the using process, and can be screwed in time if the screw is loosened.

Specifically, the gear transmission mechanism 3 includes: the sun gear 31, the planet gear 32, the inner gear ring 33, the planet gear support with the ratchet wheel 34, the pawl component 35, the upper cover 36, the lower cover 37 and the cylinder mounting plate 38; a plurality of planet wheels 32 are arranged around the sun wheel 31; the outer edges of the planet wheels 32 are in toothed connection with the inner gear ring 33; the planet wheel support 34 with the ratchet wheel for supporting the planet wheel 32 is arranged below the planet wheel 32; a pawl component 35 is arranged on the planet wheel support 34 with the ratchet wheel; the pawl component 35 is in toothed connection with the ratchet internal gear ring 34; the upper cover 36 is arranged at the upper end part of the inner gear ring 33, and the lower cover 37 is arranged at the lower end part of the inner gear ring; and a cylinder mounting plate 38 for connecting with the pneumatic driving mechanism 4 is also arranged above the upper cover 36.

The gear transmission mechanism 3 integrates the planetary gear reduction mechanism and the ratchet wheel pawl rotating stepping mechanism into a whole, and is completely symmetrically designed without generating eccentric force; the planetary gear speed reducing mechanism converts the rotary pneumatic stroke into the stroke required by valve stepping and amplifies the output torque of the pneumatic driving device; the ratchet-pawl mechanism completely meets the stepping requirement of the multi-way pneumatic rotary valve.

The gear transmission mechanism 3 is a core component of 24-way pneumatic rotation, and comprises 1

sun wheel

31, 3

planet wheels

32, 1

inner gear ring

33, 1 planet wheel support with ratchet wheel 34, a pawl component 35, an upper cover 36, a lower cover 37 and a cylinder mounting plate 38. The gear transmission mechanism 3 realizes the functions of speed reduction, driving torque amplification and anticlockwise rotation stepping, and meets the driving requirement of a rotary valve. The stroke of the rotary cylinder 41 is generally 90 degrees, if the speed ratio of the planetary gear transmission mechanism 3 is designed to be 5, so that the rotary cylinder 41 rotates 18 degrees once, and the corresponding driving torque can be amplified by about 5 times (the transmission efficiency of the planetary gear mechanism is generally about 0.98). This makes it possible to select the use of the small-sized rotary cylinder 41. The planetary gear transmission mechanism 3 is symmetrically distributed, and any eccentric force cannot be generated in the transmission process.

24 ratchets are uniformly distributed on the planet wheel support with the ratchet wheel 34, and the interval between every two adjacent ratchets is 15 degrees. The pawl assembly 35 has 4 evenly distributed pawls and engages with the ratchet of the spider carrier 34. Pawl assembly 35 includes a plurality of pawls; a plurality of ratchet engagements of the ratchet-shaped spider supports 34; a pawl assembly 35 is connected to the upper drive shaft 16. The pawl assembly 35 is connected to the upper drive shaft 16 of the rotary valve. One counterclockwise rotation of the planet wheel with ratchet carrier 34 can drive the pawl assembly 35 to rotate 15 degrees, when the planet wheel 32 carrier rotates clockwise, the pawl can be separated from the ratchet wheel of the planet wheel with ratchet carrier 34, and the pawl assembly 35 stops at the original position. The detent mechanisms are also evenly distributed and do not produce any eccentric force.

The gear transmission mechanism 3 meets the action requirement of a 24-way rotary valve and is a closed structure, and lubricating grease in the gear transmission mechanism can be stored for a long time. The rotary valve has the advantages that the daily maintenance work is avoided in the operation process, the working reliability is extremely high, and the working efficiency of the rotary valve is greatly improved.

Specifically, the pneumatic drive mechanism 4 includes: a rotary cylinder 41, an air control valve 42, an electromagnetic valve 43, a filter pressure reducing valve 44 and a manual valve 45; the rotary cylinder 41 is connected with a pneumatic control valve 42; the pneumatic control valve 42 is connected with a solenoid valve 43, a manual valve 45 and a filtering pressure reducing valve 44.

The rotary cylinder 41 is provided with a rotary cylinder transmission shaft 411; a central hole 412 is formed in the center of the rotating cylinder transmission shaft 411; the rotary cylinder 41 is a kenonatt vane type rotary cylinder 41.

The pneumatic drive mechanism 4 is the power source for the 24-way rotary valve. The pneumatic driving mechanism 4 is connected with the gear transmission mechanism 3 to drive and control the valve body.

The rotary cylinder 41 is a kenonatt blade-type rotary cylinder 41 and has the following remarkable characteristics:

(1) the service life is very long, and the action life can reach more than four million times;

(2) only one moving part is provided, and no transmission gap exists;

(3) the structure is compact, and the overall dimension is small;

(4) the blades occupy the inner space, and the air consumption is very small;

(5) daily maintenance is not needed, and reliable operation is ensured;

(6) the action speed is extremely high, and the action requirement of the rotary valve is completely met.

The pneumatic driving mechanism 4 is matched with the gear transmission mechanism 3 to form a complete driving system of the 24-way rotary valve. When the electromagnetic valve 43 is electrified, the rotating cylinder 41 rotates 90 degrees counterclockwise under the action of compressed air, drives the sun wheel 31 connected with the rotating cylinder to rotate 90 degrees counterclockwise, then drives the belt ratchet planet wheel support 34 to rotate 18 degrees counterclockwise, and drives the pawl assembly 35 to rotate 15 degrees counterclockwise.

When the electromagnetic valve 43 is powered off, the rotary air cylinder 41 rotates clockwise by 90 degrees under the action of compressed air to drive the sun wheel 31 connected with the rotary air cylinder to rotate clockwise by 90 degrees, then the planet wheel 32 support is driven to rotate clockwise by 18 degrees, at the moment, the pawl and the ratchet wheel are separated, the pawl assembly 35 is kept in the original position, and preparation is made for the next step of the pawl assembly 35 by 15 degrees.

After receiving the control voltage, the electromagnetic valve 43 can control the rotating cylinder 41 to rotate under the action of the compressed gas, and the rotating angle is generally 90 degrees and can be adjusted; the action time of the pneumatic device meets the requirement of the valve; the center of the drive shaft on the rotary cylinder 41 has a hole to facilitate the drive shaft 52 of the position feedback mechanism to pass through the rotary cylinder 41.

Specifically, the position feedback mechanism 5 includes: a proximity switch 51, a position feedback mechanism transmission shaft 52 and an induction block 53; the transmission shaft of the position feedback mechanism 5 passes through the central hole 412 on the transmission shaft 411 of the rotary cylinder and the central hole 412 arranged at the center of the sun gear 31 and is connected with the pawl assembly 35; the number of the induction blocks 53 is two, wherein one induction block 53 is arranged on the transmission shaft 411 of the rotary cylinder, and the other induction block 53 is arranged on the transmission shaft of the position feedback mechanism 5; the proximity switches 51 are disposed around the sensing block 53.

The transmission shaft of the position feedback mechanism 5 is connected with the pawl assembly 35 through a central hole 412 on the transmission shaft 411 of the rotary cylinder and a central hole on the sun gear 31; the position feedback mechanism 5 has two sensing blocks 53, one sensing block 53 is mounted on the transmission shaft 411 of the rotary cylinder for feeding back the operation of the rotary cylinder 41, and the other sensing block 53 is mounted on the transmission shaft for feeding back the actual position of the valve.

The position feedback mechanism 5 drives the shaft to pass through the center of the shaft of the rotary cylinder 41, and the center of the gear transmission mechanism 3 is connected with the driving shaft 16 on the valve body and rotates along with the turntable 14, so that the driving shaft drives the sensing block 53 to rotate along with the turntable 14.

The proximity switch 51 assembly has 24 position proximity switches 51 corresponding to the rotary valve position and 7 zone proximity switches 51. When the sensing arm on the sensing block 53 assembly is moved over the proximity switch 51, the proximity switch 51 outputs a switching signal to the controller.

The position feedback mechanism 5 is provided with three aviation plugs 54, each aviation plug 54 is 24 cores and is respectively connected with 24 position proximity switches 51, 7 area proximity switches 51 and 3 cylinder position proximity switches 51. The proximity switch 51 signal is conveniently transmitted to the 24-way rotary valve controller by means of an aircraft plug 54.

Finally, it should be noted that: the above embodiments are only used to illustrate the technical solution of the present invention, and not to limit the same; while the invention has been described in detail and with reference to the foregoing embodiments, it will be understood by those skilled in the art that: the technical solutions described in the foregoing embodiments may still be modified, or some or all of the technical features may be equivalently replaced; and the modifications or the substitutions do not make the essence of the corresponding technical solutions depart from the scope of the technical solutions of the embodiments of the present invention.

Claims

1. A multi-ported pneumatic rotary valve comprising: a multi-way rotary valve body assembly and a stuffing box; it is characterized in that the preparation method is characterized in that,

a stuffing box sealing structure connected with the multi-way rotary valve body assembly and used for sealing the stuffing box is arranged above the multi-way rotary valve body assembly;

an upper driving shaft arranged on the multi-way rotary valve body assembly penetrates through the stuffing box sealing mechanism to extend upwards and is connected with a gear transmission mechanism, and the gear transmission mechanism drives the upper driving shaft to rotate;

the pneumatic driving mechanism is connected with the gear transmission mechanism and controls the gear transmission mechanism to work;

and a position feedback mechanism connected with the pneumatic driving mechanism and used for feeding back the rotation of the gear transmission mechanism is arranged above the pneumatic driving mechanism.

2. A multiport pneumatic rotary valve as set forth in claim 1, wherein said multiport rotary valve body assembly comprises: the valve cover, the coupling, the lower driving shaft, the rotary disc and the fixed disc; an upper driving shaft is arranged in the valve cover; the upper end of the upper driving shaft is connected with a gear transmission mechanism, and the lower end of the upper driving shaft is connected with the lower driving shaft through the coupling; the lower driving shaft is connected with a turntable; the fixed disc is arranged below the valve cover and is connected with the valve cover; the working end of the rotating disc is arranged in the fixed disc.

3. A multi-ported pneumatic rotary valve of claim 2, wherein the stuffing box seal arrangement comprises: the device comprises an installation support, a valve position disc, a valve position pointer, a packing gland, an upper packing ring, a packing seat and a lower packing ring; a valve position disc is arranged in the mounting bracket, is sleeved on the upper driving shaft and synchronously rotates with the upper driving shaft; valve position pointers are arranged outside the valve position disc at intervals in the horizontal direction; the lower part of the valve position pointer is fixed on the packing gland; a packing gland is fixedly connected above the packing seat, a valve bonnet is fixedly connected below the packing seat, and a liquid discharge port and an exhaust port are respectively arranged on two sides of the packing seat; the liquid outlet and the air outlet are respectively communicated with the outside of the upper driving shaft through a channel arranged on the packing seat; an upper packing ring sleeved outside the upper driving shaft is arranged above the end part of the channel connected with the liquid discharge port; a lower packing ring sleeved outside the upper driving shaft is arranged above the end part of the channel connected with the exhaust port; and a spacing ring for spacing the upper packing ring and the lower packing ring is arranged between the upper packing ring and the lower packing ring.

4. A multi-ported pneumatic rotary valve of claim 3 wherein the gland has a guide sleeve inside; the upper driving shaft penetrates through the guide sleeve.

5. A multi-ported pneumatic rotary valve according to claim 4 wherein the guide sleeve is a copper guide sleeve.

6. A multi-ported pneumatic rotary valve according to claim 1 wherein the gear train comprises: the device comprises a sun wheel, a planet wheel, an inner gear ring, a planet wheel support with a ratchet wheel, a pawl component, an upper cover, a lower cover and a cylinder mounting plate; a plurality of planet wheels are arranged around the sun wheel; the outer edges of the planet wheels are in toothed connection with the inner gear ring; the planet wheel support with the ratchet wheel is arranged below the planet wheel and used for supporting the planet wheel; a pawl component is arranged on the planet wheel support with the ratchet wheel; the pawl component is in toothed connection with the inner gear ring of the ratchet wheel; the upper cover is arranged at the upper end part of the inner gear ring, and the lower cover is arranged at the lower end part of the inner gear ring; and an air cylinder mounting plate used for being connected with the pneumatic driving mechanism is also arranged above the upper cover.

7. The multiport pneumatic rotary valve of claim 6, wherein the pawl assembly comprises a plurality of pawls; the pawls are meshed with the ratchet internal gear ring; a pawl assembly is coupled to the upper drive shaft.

8. A multiport pneumatic rotary valve as set forth in claim 7 wherein said pneumatic drive mechanism comprises: the device comprises a rotary cylinder, a pneumatic control valve, an electromagnetic valve, a filtering pressure reducing valve and a manual valve; the rotary cylinder is connected with a pneumatic control valve; the pneumatic control valve is connected with the electromagnetic valve, the manual valve and the filtering pressure reducing valve.

9. A multi-ported pneumatic rotary valve of claim 8 wherein the rotary cylinder is provided with a rotary cylinder drive shaft; the center of the transmission shaft of the rotary cylinder is provided with a center hole; the rotary cylinder is a kenonatt blade type rotary cylinder.

10. A multi-ported pneumatic rotary valve of claim 9, wherein the position feedback mechanism comprises: the device comprises a proximity switch, a position feedback mechanism transmission shaft and an induction block; the position feedback mechanism transmission shaft penetrates through the central hole in the rotary cylinder transmission shaft and a central hole formed in the center of the sun wheel and is connected with the pawl assembly; the number of the induction blocks is two, one induction block is arranged on a transmission shaft of the rotary cylinder, and the other induction block is arranged on a transmission shaft of the position feedback mechanism; the proximity switches are arranged around the induction block.