A multi-vent pneumatic rotary valve

Abstract

The present invention relates to an improvement of a 24-way rotary valve, and particularly to a multi-way pneumatic rotary valve. The multi-way pneumatic rotary valve includes a multi-way rotary valve body assembly and a stuffing box; a stuffing box sealing structure for sealing the stuffing box is provided above the multi-way rotary valve body assembly and is connected thereto; an upper drive shaft provided on the multi-way rotary valve body assembly passes through the stuffing box sealing mechanism and extends upward to be connected to a gear transmission mechanism, and the gear transmission mechanism drives the upper drive shaft to rotate; a pneumatic drive mechanism is provided above the gear transmission mechanism and is connected thereto to control the operation of the gear transmission mechanism; a position feedback mechanism for feeding back the rotation of the gear transmission mechanism is provided above the pneumatic drive mechanism. The multi-way pneumatic rotary valve of the present invention has the advantages of small floor area and high stability.

Description

Technical Field

[0001] The present invention relates to an improvement of a 24-way rotary valve, and more particularly to a multi-way pneumatic rotary valve. Background Art

[0002] The simulated moving bed molecular sieve adsorption separation process is an advanced and efficient chemical adsorption separation process. Adsorbents (molecular sieves) are filled in 24 fixed bed layers of an adsorption tower, and a 24-way rotary valve continuously switches the material inlet and outlet of each bed layer of the adsorption tower at certain time intervals. This process is equivalent to the movement of the adsorbent (molecular sieve) in the adsorption tower, so it is called a simulated moving bed. The 24-way rotary valve is a special valve developed specifically for the simulated moving bed molecular sieve adsorption separation process.

[0003] In the past few decades, Chinese petrochemical enterprises have successively imported many 24-way rotary valves with the introduction of UOP's advanced simulated moving bed molecular sieve adsorption separation process technology and have been using them in China.

[0004] In order to promote the application of the advanced simulated moving bed molecular sieve adsorption separation process technology, reduce investment costs, improve the operating efficiency of enterprises, and promote the progress of petrochemical technology, the State Key Project of "Research on 24-way Rotary Valve" was issued by Sinopec in 1997.

[0005] The successful development of the 24-way rotary valve has completely changed people's understanding and thinking of traditional valves, turning the valve as a pipeline fitting into the core equipment of petrochemical industry.

[0006] So far, the 24-way rotary valves used at home and abroad are all driven by hydraulic means, that is, they are called 24-way hydraulic rotary valves. The 24-way hydraulic rotary valve has problems such as complex structure, large floor area, high cost, high energy consumption, environmental pollution and fire hazards due to possible oil leakage in the hydraulic system. Summary of the Invention

[0007] The purpose of the present invention is to provide a multi-way pneumatic rotary valve, which can solve the above technical problems;

[0008] The present invention provides a multi-way pneumatic rotary valve, which includes a multi-way rotary valve body assembly and a stuffing box; a stuffing box sealing structure for sealing the stuffing box is provided above the multi-way rotary valve body assembly and is connected thereto; the upper drive shaft provided on the multi-way rotary valve body assembly passes through the stuffing box sealing mechanism and extends upward to be connected with a gear transmission mechanism, and the gear transmission mechanism drives the upper drive shaft to rotate; an air-driven mechanism for controlling the operation of the gear transmission mechanism is provided above the gear transmission mechanism and is connected thereto; a position feedback mechanism for feeding back the rotation of the gear transmission mechanism is provided above the air-driven mechanism and is connected thereto.

[0009] Among them, the multi-way rotary valve body assembly includes: a valve cover, a coupling, a lower drive shaft, a turntable and a fixed disk; an upper drive shaft is provided inside the valve cover; the upper end of the upper drive shaft is connected to a gear transmission mechanism, and the lower end is connected to the lower drive shaft through the coupling; the lower drive shaft is connected with a turntable; the fixed disk is arranged below the valve cover, and the fixed disk is connected with the valve cover.

[0010] Among them, the stuffing box sealing structure includes: a mounting bracket, a valve position disk, a valve position pointer, a stuffing gland, an upper packing ring, a stuffing seat and a lower packing ring; a valve position disk is provided inside the mounting bracket, and the valve position disk is sleeved on the upper drive shaft, and the valve position disk rotates synchronously with the upper drive shaft; valve position pointers are horizontally arranged at intervals outside the valve position disk; the lower part of the valve position pointer is fixed on the stuffing gland; the upper part of the stuffing seat is fixedly connected with the stuffing gland, the lower part is fixedly connected with the valve cover, and drain ports and exhaust ports are respectively arranged on both sides; the drain ports and the exhaust ports are respectively communicated with the outside of the upper drive shaft through channels arranged on the stuffing seat; an upper packing ring sleeved on the outside of the upper drive shaft is arranged above the end of the channel connected to the drain port; a lower packing ring sleeved on the outside of the upper drive shaft is arranged above the end of the channel connected to the exhaust port; a spacer ring for spacing the upper packing ring and the lower packing ring is arranged between the upper packing ring and the lower packing ring.

[0011] Among them, a guide sleeve is provided inside the stuffing gland; the upper drive shaft passes through the guide sleeve.

[0012] Among them, the guide sleeve is a copper guide sleeve.

[0013] Among them, the gear transmission mechanism includes: a sun gear, planet gears, an internal gear ring, a ratchet-equipped planet gear bracket, a pawl assembly, an upper cover, a lower cover and a cylinder mounting plate; a plurality of planet gears are arranged around the sun gear; the outer edges of the plurality of planet gears are tooth-connected with the internal gear ring; the ratchet-equipped planet gear bracket for supporting the planet gears is arranged below the planet gears; a pawl assembly is arranged on the ratchet-equipped planet gear bracket; the pawl assembly is tooth-connected with the ratchet internal gear ring; the upper cover is arranged at the upper end of the internal gear ring, and the lower cover is arranged at the lower end of the internal gear ring; a cylinder mounting plate for connecting with the pneumatic drive mechanism is further arranged above the upper cover.

[0014] Among them, the pawl assembly includes a plurality of pawls; the plurality of pawls are meshed with the ratchet internal gear ring; the pawl assembly is connected to the upper drive shaft.

[0015] Among them, the pneumatic drive mechanism includes: a rotary cylinder, a pneumatic control valve, a solenoid valve, a filter pressure reducing valve and a manual valve; the rotary cylinder is connected to the pneumatic control valve; the pneumatic control valve is connected to the solenoid valve, the manual valve and the filter pressure reducing valve.

[0016] Among them, a rotating cylinder transmission shaft is provided on the rotating cylinder; a central hole is provided at the center of the rotating cylinder transmission shaft; the rotating cylinder is a Kennert vane type rotating cylinder.

[0017] Among them, the position feedback mechanism includes: a proximity switch, a position feedback mechanism transmission shaft, and an induction block; the position feedback mechanism transmission shaft passes through the central hole on the rotating cylinder transmission shaft and the central hole provided at the center of the sun gear, and is connected to the pawl assembly; the number of induction blocks is two, one of which is arranged on the rotating cylinder transmission shaft, and the other is arranged on the position feedback mechanism transmission shaft; the proximity switch is arranged around the induction block.

[0018] The beneficial effects of a multi-channel pneumatic rotary valve of the present invention: It has the advantages of small floor area and high stability.

[0019] The multi-channel pneumatic rotary valve of the present invention also has the following beneficial effects:

[0020] Select Kennert long-life vane type rotating cylinders and configure fast-acting pneumatic accessories, so that the pneumatic driving speed is better than hydraulic driving; invent a gear transmission mechanism integrating a planetary gear reduction mechanism and a ratchet and pawl stepping mechanism, which greatly increases the output torque of the rotating cylinder and the positioning accuracy of stepping, eliminates unbalanced forces, and makes the rotary valve operate more smoothly; creatively leads the drive shaft of the rotary valve to the top of the rotating cylinder to realize real-time detection of 24 positions of a 24-way rotary valve; in addition, a complete packing seal structure is designed for the rotary valve, completely replacing the mechanical seal structure, completely eliminating potential safety hazards; all components adopt a closed structure, completely eliminating the need for daily maintenance. There is no longer a problem of hydraulic oil leakage like a hydraulic system, completely eliminating the environmental pollution and potential safety hazards of the hydraulic system. Given the outstanding advantages of the 24-way pneumatic rotary valve, in the near future, the 24-way hydraulic rotary valve used on site will be upgraded to a 24-way pneumatic rotary valve, bringing real benefits to petrochemical enterprises. Brief Description of the Drawings

[0021] In order to more clearly illustrate the specific embodiments of the present invention or the technical solutions in the prior art, the following will briefly introduce the drawings required for use in the description of the specific embodiments or the prior art. Obviously, the following drawings are some embodiments of the present invention. For those of ordinary skill in the art, other drawings can be obtained based on these drawings without creative efforts.

[0022] Figure 1 It is a schematic diagram of the overall structure of a multi-channel pneumatic rotary valve of the present invention;

[0023] Figure 2Schematic structural diagram of the 24-way rotary valve body assembly of a multi-airway pneumatic rotary valve according to the present invention;

[0024] Figure 3 Schematic structural diagram of the packing gland seal structure of a multi-airway pneumatic rotary valve according to the present invention;

[0025] Figure 4 Schematic structural diagram of the gear transmission mechanism of a multi-airway pneumatic rotary valve according to the present invention;

[0026] Figure 5 is Figure 4 external structural diagram;

[0027] Figure 6 is Figure 4 schematic diagram of the planetary gear arrangement of the gear transmission mechanism in;

[0028] Figure 7 is Figure 4 schematic diagram of the pawl assembly arrangement in;

[0029] Figure 8 Schematic structural diagram of the pneumatic drive mechanism of a multi-airway pneumatic rotary valve according to the present invention;

[0030] Figure 9 is Figure 8 top view of;

[0031] Figure 10 Schematic structural diagram of the position feedback mechanism of a multi-airway pneumatic rotary valve according to the present invention;

[0032] Figure 11 is Figure 10 top view of.

[0033] Explanation of reference numerals:

[0034] 1. 24-way rotary valve body assembly; 11. valve cover; 111. upper and lower flange plates; 112. cylinder body; 113. head; 114. lifting lug; 115. sealant inlet and outlet flange; 116. valve position observation port; 12. coupling; 13. lower drive shaft; 14. turntable; 15. fixed disk; 16. upper drive shaft;

[0035] 2. Packing gland seal structure; 21. mounting bracket; 22. valve position disk; 23. valve position pointer; 24. packing gland; 25. upper packing ring; 26. packing seat; 27. lower packing ring; 28. spacer ring; 29. drain port; 291. exhaust port;

[0036] 3. Gear transmission mechanism; 31. sun gear; 32. planetary gear; 33. internal gear ring; 34. planetary gear bracket with ratchet; 35. pawl assembly; 36. upper cover; 37. lower cover; 38. cylinder mounting plate;

[0037] 4. Pneumatic drive mechanism; 41. Rotary cylinder; 411. Rotary cylinder transmission shaft; 412. Central hole; 42. Pneumatic control valve; 43. Solenoid valve; 44. Filter pressure reducing valve; 45. Manual valve;

[0038] 5. Position feedback mechanism; 51. Proximity switch; 52. Position feedback mechanism transmission shaft; 53. Inductive block; 54. Aviation plug. Specific implementation mode

[0039] The technical solutions of the present invention will be clearly and completely described below in conjunction with the embodiments. Obviously, the described embodiments are part of the embodiments of the present invention, rather than all of the embodiments. All other embodiments obtained by those of ordinary skill in the art based on the embodiments of the present invention without creative efforts shall fall within the protection scope of the present invention.

[0040] In the description of the present invention, it should be understood that the terms "center", "longitudinal", "transverse", "length", "width", "thickness", "upper", "lower", "front", "rear", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer", "clockwise", "counterclockwise", etc. indicate the orientation or positional relationship based on the orientation or positional relationship shown in the drawings. It is only for the convenience of describing the present invention and simplifying the description, rather than indicating or implying that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and therefore cannot be understood as a limitation to the present invention.

[0041] In addition, the terms "first" and "second" are only used for descriptive purposes and cannot be understood as indicating or implying relative importance or implicitly indicating the quantity of the indicated technical features. Thus, the features defined with "first" and "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 otherwise specifically defined. In addition, the terms "installation", "connection", and "connection" should be understood in a broad sense. For example, it can be a fixed connection, a detachable connection, or an integral connection; it can be a mechanical connection or an electrical connection; it can be directly connected or indirectly connected through an intermediate medium, and it can be the communication inside two elements. For those of ordinary skill in the art, the specific meanings of the above terms in the present invention can be understood according to specific circumstances.

[0042] Refer to Figures 1 - 11 , and the following takes a 24-way pneumatic rotary valve as an example to illustrate the specific implementation mode:

[0043] The 24-way pneumatic rotary valve includes a 24-way rotary valve body assembly 1, a stuffing box sealing structure 2, a gear transmission mechanism 3, a pneumatic drive mechanism 4, and a position feedback mechanism 5.

[0044] Above the multi-way rotary valve body assembly, there is a stuffing box sealing structure 2 connected thereto for sealing the upper drive shaft 16; the upper drive shaft 16 provided on the multi-way rotary valve body assembly passes through the stuffing box sealing mechanism and extends upward to be connected with the gear transmission mechanism 3, and the gear transmission mechanism 3 drives the upper drive shaft 16 to rotate; above the gear transmission mechanism 3, there is a pneumatic drive mechanism 4 connected thereto and controlling the operation of the gear transmission mechanism 3; above the pneumatic drive mechanism 4, there is a position feedback mechanism 5 connected thereto for feedbacking the rotation position of the gear transmission mechanism 3.

[0045] Specifically, the 24-way rotary valve body assembly 1 includes: a valve cover 11, a coupling 12, a lower drive shaft 13, a turntable 14 and a fixed disk 15; an upper drive shaft 16 is provided inside the valve cover 11; the upper end of the upper drive shaft 16 is connected with the gear transmission mechanism 3, and the lower end is connected with the lower drive shaft 13 through the coupling 12; the lower drive shaft 13 is connected with the turntable 14; the fixed disk 15 is arranged below the valve cover 11, and the fixed disk 15 is connected with the valve cover 11; the working end of the lower drive shaft is arranged inside the fixed disk 15.

[0046] The 24 process pipes on the fixed disk 15 are respectively connected with 24 beds of the adsorption tower. The turntable 14 rotates step by step counterclockwise under the drive of the lower drive shaft 13, stops at 24 positions per circle, distributes the materials in the 7 material pipes to the 24 process pipes according to the process requirements, and then transports them to the corresponding beds of the adsorption tower.

[0047] The valve cover 11 is welded by upper and lower flange plates 111, a cylinder body 112 and a head 113. It is equipped with mounting lugs 114, a sealant inlet and outlet flange 115, a sealant discharge flange, a valve position observation port 116 and three mounting auxiliary flanges on it. The valve cover 11 provides a closed inner cavity for the turntable 14, the upper drive shaft 16, the lower drive shaft 13 and the coupling 12. The sealant enters the inner cavity of the valve cover 11 through the sealant inlet and outlet flange 115 on the valve cover 11, uses its pressure to press the sealing surface of the turntable 14 against the sealing surface of the fixed disk 15, and provides the necessary sealing specific pressure for it.

[0048] The turntable 14 is composed of a circular reinforced polytetrafluoroethylene sealing plate, a metal disk with key grooves and 7 metal cross pipes. The 7 metal cross pipes respectively connect the 7 material fan-shaped holes distributed at the central position and the 7 process holes distributed on the outer circle. The positions of the 7 process holes distributed on the outer circle determine the material distribution law of the rotary valve.

[0049] The fixed plate 15 is welded by a metal disc, 24 process pipes and 7 material pipes (the structures of the 24 process pipes and 7 material pipes are prior arts). Seven concentric grooves and 24 process holes distributed on the outer ring are machined on the metal disc. Each groove is respectively connected to 7 material pipelines. The externally input materials are input into the corresponding material grooves through the material pipes, and the output materials are also transported 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 rotating disc 14 are communicated with the corresponding process holes on the fixed plate 15 through 7 holes on the sealing plate.

[0050] The lower drive shaft 13 is connected to the fixed plate 15 through a copper bushing and is respectively connected to the rotating disc 14 and the coupling 12 through keys. The upper drive shaft 16 is respectively connected to the coupling 12 and the gear transmission mechanism 3 through keys. The coupling 12 adopts a gear coupling 12, which can automatically adjust the transmission error of the upper and lower drive shafts 13 during operation.

[0051] The operation of the 24-way rotary valve body assembly 1: Driven by the gear transmission mechanism 3, the upper drive shaft 16 drives the lower drive shaft 13 through the coupling 12, and then drives the rotating disc 14 to rotate counterclockwise. The upper drive shaft 16 rotates counterclockwise by 15° every once in a while, so that the rotating disc 14 rotates by 15° each time. In this way, the rotating disc 14 has 24 stop positions in each circle. At each stop position, the 7 process holes on the rotating disc 14 are respectively communicated with the 7 process holes on the fixed plate 15, and the other 17 holes on the fixed plate 15 are blocked by the sealing plate on the rotating disc 14. In this way, the input materials enter the grooves of the fixed plate 15 through the material pipes, enter its cross pipes through the fan-shaped holes on the rotating disc 14, then enter the process holes of the fixed plate 15 through its process holes, and then enter the beds of the adsorption tower through the process pipes of the fixed plate 15; the output materials are just the opposite, starting from the beds of the adsorption tower, passing through the process pipelines of the fixed plate 15, the process holes of the fixed plate 15, the process holes of the rotating disc 14, the cross pipes of the rotating disc 14, the fan-shaped openings of the rotating disc 14, the grooves of the fixed plate 15, and the material pipes of the fixed plate 15 and then output.

[0052] The valve body part of the rotary valve works reliably. Except that the sealing plate made of reinforced polytetrafluoroethylene needs to be replaced regularly, other components have an extremely long service life. The service life of the reinforced polytetrafluoroethylene sealing plate is affected by its own flatness and smoothness, the flatness accuracy and surface smoothness of the sealing surface of the fixed plate 15, the surface accuracy of the rotating disc 14, the pressure of the sealant, the composition of the medium, the operating temperature of the valve, etc. Generally, the service life is 3 to 5 years.

[0053] The power source of the 24-way rotary valve body assembly 1 is compressed gas, such as air, nitrogen, etc.; the movement of the 24-way rotary valve body assembly 1 is to rotate step by step in one direction; the 24-way rotary valve body assembly 1 can stay at multiple positions per revolution, typical positions being 12, 24, etc.; the 24-way rotary valve body assembly 1 has multiple material inlets and outlets.

[0054] Specifically, the stuffing box sealing structure 2 includes: a mounting bracket 21, a valve position disc 22, a valve position pointer 23, a stuffing gland 24, an upper packing ring 25, a packing seat 26, and a lower packing ring 27; a valve position disc 22 is provided inside the mounting bracket 21, and the valve position disc 22 is sleeved on the upper drive shaft 16, and the valve position disc 22 rotates synchronously with the upper drive shaft 16; valve position pointers 23 are horizontally spaced outside the valve position disc 22; the valve position pointers 23 are fixed to the stuffing gland 24 below; the packing seat 26 is fixedly connected to the stuffing gland 24 above and fixedly connected to the valve cover 11 below, and a drain port 29 and an exhaust port 291 are respectively provided on both sides; the drain port 29 and the exhaust port 291 are respectively communicated with the outside of the upper drive shaft 16 through channels provided on the packing seat 26; an upper packing ring 25 sleeved on the upper drive shaft 16 is provided above the end of the channel connected to the drain port 29; a lower packing ring 27 sleeved on the upper drive shaft 16 is provided above the end of the channel connected to the exhaust port 291; a spacer ring 28 for spacing the upper packing ring 25 and the lower packing ring 27 is provided between the upper packing ring 25 and the lower packing ring 27.

[0055] An exhaust port 291 and a drain port 29 are provided on the stuffing box to ensure the seal at the valve stem; the on-site position indication of the valve is completed through the valve position pointer 23; the stuffing box provides an installation platform for the gear transmission mechanism 3.

[0056] The valve position disk 22 is fixed to the upper drive shaft 16 and can rotate together with the upper drive shaft 16, so that the valve position pointer 23 can conveniently indicate the actual position of the valve on site. The packing seat 26 is equipped with a packing leakage drainage port 29 and an exhaust port 291. Even if there is any leakage of the packing, the leakage liquid can be conveniently collected and output to a specified container through the drainage port 29. The packing uses two layers of packing, namely the upper packing ring 25 and the lower packing ring 27, to ensure the sealing of the upper drive shaft 16. A copper guide sleeve is provided on the packing gland. The upper drive shaft 16 passes through the guide sleeve to isolate the upper drive shaft 16 from the packing gland. The packing seat 26 is fixed to the valve cover 11 by precision screws. The seal between the packing seat 26 and the valve cover 11 uses an O-ring seal. Two half-ring spacer rings are placed between the packing seat 26 and the valve cover 11 to prevent the upper drive shaft 16 from moving out during use. The mounting bracket 21 and the packing seat 26 are fixed by screws and pin shafts to ensure a tight connection between them. The packing seal mechanism is designed simply and reliably, and only requires very little maintenance during use. During use, only check whether the screws are loose. If any screw is loose, it can be tightened in time.

[0057] Specifically, the gear transmission mechanism 3 includes: a sun gear 31, planet gears 32, an internal gear ring 33, a planetary gear carrier with a ratchet 34, a pawl assembly 35, an upper cover 36, a lower cover 37, and a cylinder mounting plate 38; a plurality of planet gears 32 are provided around the sun gear 31; the outer edges of the plurality of planet gears 32 are tooth-connected to the internal gear ring 33; the planetary gear carrier with a ratchet 34 for supporting the planet gears 32 is provided below the planet gears 32; the pawl assembly 35 is provided on the planetary gear carrier with a ratchet 34; the pawl assembly 35 is tooth-connected to the ratchet internal gear ring 34; the upper cover 36 is provided at the upper end of the internal gear ring 33, and the lower cover 37 is provided at the lower end of the internal gear ring 33; the cylinder mounting plate 38 for connecting to the pneumatic drive mechanism 4 is further provided above the upper cover 36.

[0058] The gear transmission mechanism 3 integrates a planetary gear reduction mechanism and a ratchet and pawl rotary stepping mechanism, with a completely symmetric design and no eccentric force generated; the planetary gear reduction mechanism converts the stroke of the rotary pneumatic into the stroke required for the valve to step, and at the same time amplifies the output torque of the pneumatic drive device; the ratchet and pawl mechanism fully meets the stepping requirements of the multi-pass pneumatic rotary valve.

[0059] The gear transmission mechanism 3 is the core component of the 24-way pneumatic rotation. It includes 1 sun gear 31, 3 planet gears 32, 1 internal gear ring 33, 1 ratchet planetary gear bracket 34, a pawl assembly 35, an upper cover 36, a lower cover 37, and a cylinder mounting plate 38. The gear transmission mechanism 3 realizes speed reduction, driving torque amplification, and counterclockwise rotation stepping functions, meeting the driving requirements of the rotary valve. The stroke of the rotary cylinder 41 is generally 90°. If the speed ratio of the planetary gear transmission mechanism 3 is designed to be 5, then each time the rotary cylinder 41 moves, the ratchet planetary gear bracket 34 will rotate 18°, and accordingly, its driving torque can be amplified by about 5 times (the transmission efficiency of the planetary gear mechanism is generally about 0.98). In this way, a small-sized rotary cylinder 41 can be selected. The planetary gear transmission mechanism 3 is symmetrically distributed and will not generate any eccentric force during the transmission process.

[0060] The ratchet planetary gear bracket 34 is evenly distributed with 24 ratchet teeth, and the adjacent ratchet teeth are spaced 15°. The pawl assembly 35 has 4 evenly distributed pawls and meshes with the ratchet of the ratchet-shaped planetary gear bracket 34. The pawl assembly 35 includes multiple pawls; meshes with multiple ratchets of the ratchet-shaped planetary gear bracket 34; the 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. Each time the ratchet planetary gear bracket 34 rotates counterclockwise, it can drive the pawl assembly 35 to rotate 15°. When the bracket of the planet gear 32 rotates clockwise, the pawl will disengage from the ratchet of the ratchet-shaped planetary gear bracket 34, and the pawl assembly 35 will stop in place. The pawl mechanism is also evenly distributed and will not generate any eccentric force.

[0061] The gear transmission mechanism 3 meets the action requirements of the 24-way rotary valve and is also a closed structure, so the lubricating grease inside can be preserved for a long time. During operation, it eliminates the need for daily maintenance work, has extremely high working reliability, and greatly improves the working efficiency of the rotary valve.

[0062] Specifically, the pneumatic drive mechanism 4 includes: a rotary cylinder 41, a pneumatic control valve 42, a solenoid valve 43, a filter pressure reducing valve 44, and a manual valve 45; the rotary cylinder 41 is connected to the pneumatic control valve 42; the pneumatic control valve 42 is connected to the solenoid valve 43, the manual valve 45, and the filter pressure reducing valve 44.

[0063] The rotary cylinder 41 is provided with a rotary cylinder transmission shaft 411; a central hole 412 is provided at the center of the rotary cylinder transmission shaft 411; the rotary cylinder 41 is a Kennert vane type rotary cylinder 41.

[0064] The pneumatic drive mechanism 4 is the power source of the 24-way rotary valve. The pneumatic drive mechanism 4 is connected to the gear transmission mechanism 3 to realize the drive and control of the valve body.

[0065] The rotating cylinder 41 selects the Kennert vane type rotating cylinder 41, which has the following remarkable features:

[0066] (1) Extraordinarily long service life, and the operating life can reach more than four million times;

[0067] (2) It has only one moving part and no transmission clearance;

[0068] (3) Compact structure and small overall dimensions;

[0069] (4) The vanes fill the internal space, and the air consumption is very small;

[0070] (5) No daily maintenance is required to ensure reliable operation;

[0071] (6) The action speed is extremely fast, fully meeting the action requirements of the rotary valve.

[0072] The pneumatic drive mechanism 4 cooperates with the gear drive mechanism 3 to form a complete drive system for the 24-way rotary valve. When the solenoid valve 43 is energized, the rotating cylinder 41 rotates counterclockwise by 90° under the action of compressed air, driving the sun gear 31 connected to it to rotate counterclockwise by 90°, and then driving the ratchet planetary gear bracket 34 to rotate counterclockwise by 18°, and driving the pawl assembly 35 to rotate counterclockwise by 15°.

[0073] When the solenoid valve 43 is de-energized, the rotating cylinder 41 rotates clockwise by 90° under the action of compressed air, driving the sun gear 31 connected to it to rotate clockwise by 90°, and then driving the planetary gear 32 bracket to rotate clockwise by 18°. At this time, the pawl and the ratchet are disengaged, and the pawl assembly 35 remains in place, and is ready for the next 15° step of the pawl assembly 35.

[0074] After receiving the control voltage, the solenoid valve 43 can control the rotating action of the rotating cylinder 41 under the action of compressed gas. The rotation angle is generally 90° and can be adjusted; the action time of the pneumatic device meets the requirements of the valve; there is a hole in the center of the transmission shaft of the rotating cylinder 41, which facilitates the transmission shaft 52 of the position feedback mechanism to pass through the rotating cylinder 41.

[0075] 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 rotating cylinder transmission shaft 411 and the central hole 412 provided at the center of the sun gear 31, and is connected to the pawl assembly 35; the number of the induction blocks 53 is two, one of the induction blocks 53 is arranged on the rotating cylinder transmission shaft 411, and the other induction block 53 is arranged on the transmission shaft of the position feedback mechanism 5; the proximity switch 51 is arranged around the induction block 53.

[0076] The transmission shaft of the position feedback mechanism 5 is connected to the pawl assembly 35 through the central hole 412 on the transmission shaft 411 of the rotary cylinder and the hole at the central position on the sun gear 31; the position feedback mechanism 5 has two induction blocks 53. One induction block 53 is installed on the transmission shaft 411 of the rotary cylinder to feedback the movement of the rotary cylinder 41, and the other induction block 53 is installed on its transmission shaft to feedback the actual position of the valve.

[0077] The transmission shaft of the position feedback mechanism 5 passes through the center of the shaft of the rotary cylinder 41, the center of the gear transmission mechanism 3 and is connected to the drive shaft 16 on the valve body and rotates together with the turntable 14, so as to ensure that its drive shaft drives the induction block 53 and the turntable 14 to rotate together.

[0078] The proximity switch 51 assembly has 24 position proximity switches 51 consistent with the position of the rotary valve and 7 area proximity switches 51. When the induction arm on the induction block 53 assembly runs above the proximity switch 51, the proximity switch 51 outputs a switch signal to the controller.

[0079] There are three aviation plugs 54 on the position feedback mechanism 5. Each aviation plug 54 has 24 cores and is respectively connected to 24 position proximity switches 51, 7 area proximity switches 51 and 3 cylinder position proximity switches 51. Through the aviation plug 54, the signal of the proximity switch 51 is conveniently transmitted to the 24-way rotary valve controller.

[0080] Finally, it should be noted that the above embodiments are only used to illustrate the technical solutions of the present invention, rather than to limit them; although the present invention has been described in detail with reference to the foregoing embodiments, those of ordinary skill in the art should understand that: they can still modify the technical solutions recorded in the foregoing embodiments, or perform equivalent replacements on some or all of the technical features; and these modifications or replacements do not make the essence of the corresponding technical solutions deviate from the scope of the technical solutions of the embodiments of the present invention.

Claims

1. A multi-vent pneumatic rotary valve, comprising: Multi-way rotary valve body assembly and stuffing box; characterized in that Above the multi-way rotary valve body assembly, there is a stuffing box sealing structure connected thereto for sealing the stuffing box. The upper drive shaft provided on the multi-way rotary valve body assembly passes through the stuffing box sealing mechanism and extends upward to be connected with a gear transmission mechanism, and the gear transmission mechanism drives the upper drive shaft to rotate. Above the gear transmission mechanism, there is a pneumatic drive mechanism connected thereto and controlling the operation of the gear transmission mechanism. Above the pneumatic drive mechanism, there is a position feedback mechanism connected thereto for feedbacking the rotation position of the gear transmission mechanism. The gear transmission mechanism includes: a sun gear, planet gears, an internal gear ring, a ratchet-equipped planet gear bracket, a pawl assembly, an upper cover, a lower cover, and a cylinder mounting plate; there are a plurality of planet gears arranged around the sun gear; the outer edges of the plurality of planet gears are tooth-connected with the internal gear ring; below the planet gears, there is the ratchet-equipped planet gear bracket for supporting the planet gears; on the ratchet-equipped planet gear bracket, there is a pawl assembly; the pawl assembly is tooth-connected with the ratchet-equipped planet gear bracket; at the upper end of the internal gear ring, there is the upper cover, and at the lower end, there is the lower cover; above the upper cover, there is also a cylinder mounting plate for connecting with the pneumatic drive mechanism.

2. The multi-vent pneumatic rotary valve according to claim 1, wherein The multi-way rotary valve body assembly includes: a valve cover, a coupling, a lower drive shaft, a turntable, and a stator; inside the valve cover, there is an upper drive shaft; the upper end of the upper drive shaft is connected with the gear transmission mechanism, and the lower end is connected with the lower drive shaft through the coupling; the lower drive shaft is connected with a turntable; the stator is arranged below the valve cover and is connected with the valve cover; the working end of the turntable is arranged inside the stator.

3. The multi-vent pneumatic rotary valve according to claim 2, characterized in that, The stuffing box sealing structure includes: a mounting bracket, a valve position disk, a valve position pointer, a stuffing gland, an upper packing ring, a stuffing seat, and a lower packing ring; inside the mounting bracket, there is a valve position disk, and the valve position disk is sleeved on the upper drive shaft and rotates synchronously with the upper drive shaft; horizontally at intervals outside the valve position disk, there are valve position pointers; below the valve position pointers, they are fixed on the stuffing gland; above the stuffing seat, it is fixedly connected with the stuffing gland, and below, it is fixedly connected with the valve cover, and on both sides, there are a drain port and an exhaust port respectively; the drain port and the exhaust port are respectively communicated with the outside of the upper drive shaft through channels provided on the stuffing seat; above the end of the channel connected to the drain port, there is an upper packing ring sleeved on the outside of the upper drive shaft; above the end of the channel connected to the exhaust port, there is a lower packing ring sleeved on the outside of the upper drive shaft; between the upper packing ring and the lower packing ring, there is a spacer ring for spacing the upper packing ring and the lower packing ring.

4. The multi-vent pneumatic rotary valve according to claim 3, wherein, Inside the stuffing gland, there is a guide sleeve; the upper drive shaft passes through the guide sleeve.

5. A multi-vent pneumatic rotary valve according to claim 4, characterized in that, The guide sleeve is a copper guide sleeve.

6. The multi-vent pneumatic rotary valve according to claim 1, characterized in that, The pawl assembly includes a plurality of pawls; the plurality of pawls are engaged with the ratchet-equipped planet gear bracket; the pawl assembly is connected with the upper drive shaft.

7. A multi-vent pneumatic rotary valve according to claim 6, characterized in that, The pneumatic drive mechanism includes: a rotary cylinder, a pneumatic control valve, a solenoid valve, a filter pressure reducing valve, and a manual valve; the rotary cylinder is connected with the pneumatic control valve; the pneumatic control valve is connected with the solenoid valve, the manual valve, and the filter pressure reducing valve.

8. A multi-vent pneumatic rotary valve according to claim 7, characterized in that, A rotating cylinder drive shaft is provided on the rotating cylinder; a central hole is provided at the center of the rotating cylinder drive shaft; the rotating cylinder is a Kennert vane type rotating cylinder.

9. The multi-vent pneumatic rotary valve according to claim 8, wherein, The position feedback mechanism includes: a proximity switch, a position feedback mechanism drive shaft, and an induction block; the position feedback mechanism drive shaft passes through the central hole on the rotating cylinder drive shaft and the central hole provided at the center of the sun gear, and is connected to the pawl assembly; the number of induction blocks is two, one of which is arranged on the rotating cylinder drive shaft, and the other is arranged on the position feedback mechanism drive shaft; the proximity switch is arranged around the induction block.

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