A multi-vane shaft rotating discharge valve

Abstract

The utility model provides a kind of multi-impeller shaft rotation unloading valve, and the driven impeller is equipped in unloading valve shell, and the driven impeller is synchronously transmitted through sprocket transmission mechanism between the driving impeller and the driven impeller and is composed of multi-impeller shaft structure, driving device drives the driving impeller rotation and drives the driven impeller synchronous rotation to realize multi-impeller unloading, this multi-impeller shaft structure can effectively reduce the height of valve body, it is favorable to reduce equipment installation requirement and production cost;The two end surfaces of all impellers are equipped with multiple sealing structure between unloading valve shell, can effectively improve the airtightness of valve, reduce the internal leakage of valve;The blade outside of all impellers is equipped with flexible sealing strip, and relative friction is formed between flexible sealing strip and unloading valve shell when impeller rotates Dynamic sealing, effectively prevent hard friction between impeller and shell during rotation to produce spark, avoid wear and tear and be more suitable for explosion-proof dust removal place.

Description

Technical Field

[0001] This utility model relates to a dust collector unloading valve, and more particularly to a multi-impeller shaft rotary unloading valve. Background Technology

[0002] Rotary discharge valves play a crucial role in the dust removal industry, ensuring airtight ash discharge. They are widely used at the bottom of the ash hoppers in baghouse dust collectors, cyclone dust collectors, and cartridge dust collectors. Their core function is to continuously and quantitatively discharge the collected dust while maintaining the system's negative or positive pressure, preventing backflow of external air or escape of internal dust. The specific applications of rotary discharge valves can be summarized as follows: 1. Continuous ash discharge and airtightness: The rotary discharge valve (also known as a star-shaped ash discharge valve or rigid impeller feeder) uses the rotation of the rotor blades to discharge the dust accumulated in the ash hopper section by section. The tiny gap between the blades and the casing forms an "airlock," which both locks in air and maintains continuous discharge, preventing the dust collector from experiencing efficiency reduction due to air leakage. 2. Explosion-proof and fire-resistant applications: When handling flammable and explosive dust such as coal powder, wood powder, and aluminum-magnesium powder, explosion-proof rotary ash discharge valves (explosion-proof motor, anti-static blades, and anti-backfire structure) can promptly discharge and isolate dust, reducing the risk of explosion caused by dust accumulation. 3. Sealing requirements of negative pressure dust collection systems: In negative pressure dust collectors, the ash hopper is in a high negative pressure zone, making ordinary gate valves or slide valves prone to air leakage. Rotary ash discharge valves, relying on the principle of "multi-compartment + rotary airlock," can maintain a tight airlock even at negative pressures of -10 kPa or higher, ensuring airflow balance in the dust collector.

[0003] Rotary discharge valves are a core component of integrated "ash discharge-airlock" solutions in the dust collection industry. However, current rotary discharge valves still have some shortcomings in installation and use. For example, the valve body is generally cast and then machined as a single unit, resulting in a large valve body weight and difficult processing; the valve body orifice diameter of a single impeller is proportional to its height, making the overall height of the dust collector relatively large and requiring high installation standards; in addition, the friction between the metal valve body and the metal impeller poses a risk of generating sparks, making it unsuitable for explosion-proof dust collection environments, and it also has poor sealing performance and is prone to wear. To solve these technical problems, the structure of the rotary discharge valve needs to be improved. Summary of the Invention

[0004] This utility model proposes a multi-impeller shaft rotary discharge valve to solve the problems of processing, installation, and sealing caused by defects in the structural dimensions and materials of current rotary discharge valves.

[0005] To achieve the above objectives, the present invention adopts the following technical solution: A multi-impeller shaft rotary discharge valve includes a discharge valve housing, a driving impeller, a driven impeller, a transmission gear, a transmission chain, and a drive device; The discharge valve housing has a top feed side and a bottom discharge side, as well as a first side and a second side, which are opposite each other along the X direction. The active impeller and the driven impeller are disposed inside the discharge valve housing. The first and second ends of the active impeller and the driven impeller are respectively mounted on the first and second sides of the discharge valve housing via bearings. Along the axial direction, the first and second end faces of both the active impeller and the driven impeller are provided with multiple sealing structures to ensure that both end faces of the impeller are sealed to the discharge valve housing. Along the radial direction, the outermost edge of the rotating side of both the active impeller and the driven impeller is provided with a flexible sealing strip to ensure that the rotating side of the impeller maintains a flexible seal with the discharge valve housing when it rotates. The first end of both the driving impeller and the driven impeller is equipped with the transmission gear. The transmission gears are connected in pairs by the transmission chain to form a sprocket transmission mechanism. The driven impeller rotates synchronously with the driving impeller through the sprocket transmission mechanism. The drive device is installed outside the unloading valve housing and is connected to the first end of the driving impeller. The driving device is used to drive the active impeller to rotate, and the active impeller drives the driven impeller to rotate synchronously. The material on the top feeding side is transported to the bottom discharging side as the active impeller or the driven impeller rotates.

[0006] In one possible implementation, the driving impeller includes a driving shaft and blades mounted on the driving shaft, the driven impeller includes a driven shaft and blades mounted on the driven shaft, and the transmission gears are mounted one-to-one at the first ends of the driving shaft and the driven shaft, the transmission gears rotate coaxially with their corresponding shafts, and the transmission gears are located outside the bearings at the first ends of their corresponding shafts.

[0007] In one possible implementation, a sprocket guard is provided on the outside of the first side of the unloading valve housing, the transmission gear and the transmission chain are both located inside the sprocket guard, and the drive device is mounted on the sprocket guard and connected to the drive impeller.

[0008] In one possible implementation, the unloading valve housing is formed by laser cutting of finished steel pipe and then welding it to sheet metal.

[0009] In one possible implementation, the multi-sealing structure includes a polytetrafluoroethylene (PTFE) sealing plate and a flame-retardant foam sealing plate, with the PTFE sealing plate installed on the inner side and the flame-retardant foam sealing plate installed on the outer side.

[0010] In one possible implementation, the flexible sealing strip is a polytetrafluoroethylene (PTFE) sealing strip, the length of which matches the length of the blade in which it is located.

[0011] In one possible implementation, the bearing is mounted in a bearing housing, which is fixedly mounted in the unloading valve housing. A circlip is installed in the bearing's shaft groove to axially limit the bearing. A PTFE oil seal is installed on the inner side of the bearing.

[0012] In one possible implementation, the driving device is a geared motor, which is fixedly installed by a motor mounting bracket. The output shaft of the geared motor is connected to the active impeller and drives the active impeller to rotate.

[0013] In one possible implementation, a rotation detector is provided beside the active impeller or the driven impeller, and the rotation detector is mounted and fixed by a rotation detector bracket.

[0014] In one possible implementation, the rotary detector is mounted on the second side of the unloading valve housing.

[0015] Compared with the prior art, the beneficial effects of this utility model are as follows: The rotary unloading valve adopts a multi-impeller shaft structure with chain drive, which can effectively reduce the height of the valve body, thereby reducing the overall height of the dust collector, which is conducive to reducing equipment installation requirements and production costs; the two ends of the impeller adopt a multi-seal structure, which can effectively improve the valve's airtightness and reduce internal leakage; the impeller blades are equipped with a polytetrafluoroethylene plate, which provides a soft contact seal with the unloading valve housing. On the one hand, this can effectively improve the dynamic sealing performance during rotation, and on the other hand, it can effectively prevent the hard friction between the impeller and the housing during rotation from generating sparks, avoiding wear and making it more suitable for explosion-proof dust removal environments. Attached Figure Description

[0016] To more clearly illustrate the specific embodiments of this utility model or the technical solutions in the prior art, the drawings used in the description of the specific embodiments or the prior art will be briefly introduced below. Obviously, the drawings described below are some embodiments of this utility model. For those skilled in the art, other drawings can be obtained from these drawings without creative effort.

[0017] Figure 1 A schematic diagram of the overall structure of a multi-impeller shaft rotary unloading valve; Figure 2 This is a schematic cross-sectional view of a multi-impeller shaft rotary discharge valve along the X direction. Figure 3 This is a schematic diagram of the right-side cross-sectional structure of a multi-impeller shaft rotary discharge valve.

[0018] The components include: a discharge valve housing 1, a top feed side 11, a bottom discharge side 12, a first side 101, and a second side 102; an active impeller 2, a driven impeller 3, an active shaft 21, a driven shaft 31, blades 23, a multi-seal structure 231, a flexible sealing strip 232, a polytetrafluoroethylene sealing plate 2311, and a flame-retardant foamed sealing plate 2312; a transmission gear 4, a transmission chain 5, and a sprocket protective cover 451; a drive device 6, a bearing 7, a bearing seat 71, a shaft snap ring 72, and a PTFE oil seal 73; a rotary detector 8, and a rotary detector bracket 81. Detailed Implementation

[0019] To provide a better understanding of the purpose, structure, features, and functions of this utility model, detailed descriptions are provided below with reference to specific embodiments.

[0020] In the description of this utility model, it should be noted that the terms "center", "upper", "lower", "left", "right", "vertical", "horizontal", "inner", "outer", etc., indicate the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings. They are only for the convenience of describing this utility model and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation. Therefore, they should not be construed as limitations on this utility model.

[0021] Please refer to the reference. Figure 1 , Figure 2 as well as Figure 3 A multi-impeller shaft rotary discharge valve includes a discharge valve housing 1, a driving impeller 2, a driven impeller 3, a transmission gear 4, a transmission chain 5, and a drive device 6. The discharge valve housing 1 has a top feed side 11 and a bottom discharge side 12, and a first side 101 and a second side 102 opposite each other along the X direction. Material enters the discharge valve from the top feed side 11 and is transported to the bottom discharge side 12 by the rotation of the driving impeller 2 and the driven impeller 3, realizing the discharge and transportation of materials such as dust.

[0022] The active impeller 2 and the driven impeller 3 are disposed inside the discharge valve housing 1. The first end and the second end of the active impeller 2 and the driven impeller 3 are respectively mounted on the first side 101 and the second side 102 of the discharge valve housing 1 via bearings 7. Along the axial direction, the first end face and the second end face of the active impeller 2 and the driven impeller 3 are provided with a multi-seal structure 231 to keep both ends of the impeller sealed with the discharge valve housing 1. Along the radial direction, the outermost edge of the rotating side of the active impeller 2 and the driven impeller 3 is provided with a flexible sealing strip 232 to keep the rotating side of the impeller in a flexible seal with the discharge valve housing 1 when the impeller rotates. The active impeller 2 and the driven impeller 3 are installed inside the discharge valve housing 1. The contact positions between them and the discharge valve housing 1 include two end faces and the side of the blade 23 away from the rotation axis. The end faces are sealed with the discharge valve housing 1 by a multi-seal structure 231, while the rotating side of the impeller is sealed with the discharge valve housing 1 by a flexible sealing strip 232. Under the action of these two sealing structures, the active impeller 2 and the driven impeller 3 can always maintain a sealed state regardless of whether they rotate.

[0023] Both the driving impeller 2 and the driven impeller 3 have a transmission gear 4 mounted on their first ends. The transmission gears 4 are connected in pairs by a transmission chain 5 to form a sprocket transmission mechanism. The driven impeller 3 rotates synchronously with the driving impeller 2 through the sprocket transmission mechanism. The drive unit 6 is mounted outside the discharge valve housing 1 and connected to the first end of the driving impeller 2. The structures of the driving impeller 2 and the driven impeller 3 can be completely identical; the only difference is that the shaft of the driving impeller 2 is connected to the drive unit 6, which facilitates maintenance and replacement and effectively reduces production and maintenance costs.

[0024] The drive unit 6 is used to drive the active impeller 2 to rotate. The active impeller 2 drives the driven impeller 3 to rotate synchronously. The material on the top feed side 11 is conveyed to the bottom discharge side 12 as the active impeller 2 or the driven impeller 3 rotates.

[0025] The multi-impeller shaft rotary discharge valve protected by this utility model adopts a multi-impeller shaft structure, which can effectively reduce the height of the valve body. Therefore, when the valve body is used in a dust collector, it can effectively reduce the overall height of the dust collector, which is conducive to optimizing equipment costs.

[0026] The multi-impeller shaft rotary discharge valve protected by this utility model has a flexible sealing strip 232 on the rotating side of the impeller. When the impeller rotates and rubs inside the steel discharge valve housing 1, it can effectively prevent sparks from being generated between the impeller and the discharge valve housing 1, and at the same time improve the sealing performance.

[0027] The multi-impeller shaft rotary discharge valve protected by this utility model adopts a multi-length sealing structure between the impeller end face and the housing, which can further improve the valve's sealing performance and reduce internal leakage.

[0028] In some embodiments, the driving impeller 2 includes a driving shaft 21 and blades 23 mounted on the driving shaft 21, and the driven impeller 3 includes a driven shaft 31 and blades 23 mounted on the driven shaft 31. Transmission gears 4 are correspondingly mounted at the first ends of the driving shaft 21 and the driven shaft 31, and rotate coaxially with their corresponding shafts. The transmission gears 4 are located outside the bearing 7 at the first end of their corresponding shafts. The impeller structure formed by combining the rotating shaft and blades 23 has relatively low cost and can better cooperate with the sprocket drive mechanism to achieve good transmission performance.

[0029] In some embodiments, a sprocket guard 451 is provided on the outside of the first side 101 of the discharge valve housing 1. The transmission gear 4 and the transmission chain 5 are both located inside the sprocket guard 451. The drive device 6 is mounted on the sprocket guard 451 and connected to the drive impeller 2. The sprocket guard 451 can effectively protect the transmission gear 4 and the transmission chain 5 inside, prevent dust from entering and affecting the transmission effect, ensure the transmission effect, and improve the safety of the valve during use.

[0030] In some embodiments, the unloading valve housing 1 is formed by laser cutting of finished steel pipe and then welding it to sheet metal, eliminating the casting process. This allows for flexible design of the valve body's size and dimensions, reduces the housing's weight, adapts to the needs of various equipment, and reduces the overall size of the equipment, facilitating installation and maintenance.

[0031] In some embodiments, the multi-seal structure 231 includes a polytetrafluoroethylene (PTFE) sealing plate 2311 and a flame-retardant foam sealing plate 2312. The PTFE sealing plate 2311 is installed on the inner side, and the flame-retardant foam sealing plate 2312 is installed on the outer side. The double sealing structure at the end face can effectively improve the valve's sealing performance, reduce internal leakage of the valve, and effectively prevent external dust from entering.

[0032] In some embodiments, the flexible sealing strip 232 is a polytetrafluoroethylene (PTFE) sealing strip, the length of which matches the length of the blade 23. The impeller body is made of stainless steel. The combination of stainless steel and PTFE sealing strip ensures the strength of the impeller body, improves the sealing between its edge and the unloading valve housing 1, enhances wear resistance, eliminates the possibility of sparks during rotation, and improves its reliability in the explosion-proof system.

[0033] In some embodiments, the bearing 7 is installed in a bearing housing 71, which is fixedly installed in the unloading valve housing 1. A shaft retainer 72 is installed in the shaft groove of the bearing 7 to axially limit the bearing 7. A PTFE oil seal 73 is installed on the inner side of the bearing 7. This structure can achieve axial positioning of the bearing 7 while preventing external dust from entering the bearing 7, thus ensuring the sealing performance and reliability of the bearing 7.

[0034] In some embodiments, the drive device 6 is a geared motor, which is fixedly installed by a motor mounting bracket. The output shaft of the geared motor is connected to the active impeller 2 and drives the active impeller 2 to rotate. It can be a servo geared motor or a stepper geared motor with relatively low cost.

[0035] In some embodiments, a rotation detector 8 is provided beside the active impeller 2 or the driven impeller 3. The rotation detector 8 is mounted and fixed by a rotation detector bracket 81. The rotation detector 8 can be a cylindrical proximity sensor or a photoelectric detection sensor to detect the position of the impeller in real time, thereby improving the safety of the rotary valve during use. Furthermore, the rotation detector 8 is installed on the second side 102 of the discharge valve housing 1, on a different side from the bearing 7 and the transmission mechanism, to avoid too many parts on the same side and interference between parts, which could affect the detection results or the use of the valve.

[0036] In some embodiments, the rotary unloading valve of this utility model adopts a bolt quick-release rotor assembly, so that when the valve body needs to be cleaned or repaired, it can be done without disassembling the rotary valve, saving time and effort.

[0037] In summary, the improvements to the housing process, multi-impeller structure, impeller end face, and rotating side sealing structure of the rotary discharge valve of this utility model allow for flexible design of valve body size, reducing the overall volume of the equipment. This makes it suitable for the needs of various equipment, facilitates installation and maintenance, and significantly improves sealing performance, safety, and reliability.

[0038] This utility model has been described by the above-described embodiments; however, these embodiments are merely examples for implementing this utility model. It must be noted that the disclosed embodiments do not limit the scope of this utility model. Conversely, any modifications and refinements made without departing from the spirit and scope of this utility model are within the scope of patent protection of this utility model.

Claims

1. A multi-impeller shaft rotary discharge valve, characterized in that: It includes the unloading valve housing, the driving impeller, the driven impeller, the transmission gear, the transmission chain, and the drive unit; The discharge valve housing has a top feed side and a bottom discharge side, as well as a first side and a second side, which are opposite each other along the X direction. The active impeller and the driven impeller are disposed inside the discharge valve housing. The first and second ends of the active impeller and the driven impeller are respectively mounted on the first and second sides of the discharge valve housing via bearings. Along the axial direction, the first and second end faces of both the active impeller and the driven impeller are provided with multiple sealing structures to ensure that both end faces of the impeller are sealed to the discharge valve housing. Along the radial direction, the outermost edge of the rotating side of both the active impeller and the driven impeller is provided with a flexible sealing strip to ensure that the rotating side of the impeller maintains a flexible seal with the discharge valve housing when it rotates. The first end of both the driving impeller and the driven impeller is equipped with the transmission gear. The transmission gears are connected in pairs by the transmission chain to form a sprocket transmission mechanism. The driven impeller rotates synchronously with the driving impeller through the sprocket transmission mechanism. The drive device is installed outside the unloading valve housing and is connected to the first end of the driving impeller. The driving device is used to drive the active impeller to rotate, and the active impeller drives the driven impeller to rotate synchronously. The material on the top feeding side is transported to the bottom discharging side as the active impeller or the driven impeller rotates.

2. The multi-impeller shaft rotary discharge valve as described in claim 1, characterized in that: The driving impeller includes a driving shaft and blades mounted on the driving shaft. The driven impeller includes a driven shaft and blades mounted on the driven shaft. The transmission gears are mounted one-to-one at the first end of the driving shaft and the driven shaft. The transmission gears rotate coaxially with their corresponding shafts. The transmission gears are located outside the bearings at the first end of their corresponding shafts.

3. The multi-impeller shaft rotary discharge valve as described in claim 1, characterized in that: The first side of the unloading valve housing is provided with a sprocket protective cover. The transmission gear and the transmission chain are both located inside the sprocket protective cover. The drive device is installed on the sprocket protective cover and connected to the drive impeller.

4. The multi-impeller shaft rotary discharge valve as described in claim 1, characterized in that: The unloading valve housing is made by laser cutting finished steel pipes and then welding them onto sheet metal.

5. The multi-impeller shaft rotary discharge valve as described in claim 1, characterized in that: The multi-seal structure includes a polytetrafluoroethylene (PTFE) sealing plate and a flame-retardant foam sealing plate, with the PTFE sealing plate installed on the inner side and the flame-retardant foam sealing plate installed on the outer side.

6. The multi-impeller shaft rotary discharge valve as described in claim 1, characterized in that: The flexible sealing strip is a polytetrafluoroethylene (PTFE) sealing strip, and the length of the PTFE sealing strip matches the length of the blade it is located on.

7. The multi-impeller shaft rotary discharge valve as described in claim 1, characterized in that: The bearing is installed in a bearing housing, which is fixedly installed in the unloading valve housing. A circlip is installed in the shaft groove of the bearing to axially limit the bearing. A PTFE oil seal is installed on the inner side of the bearing.

8. The multi-impeller shaft rotary discharge valve as described in claim 1, characterized in that: The driving device is a geared motor, which is fixedly installed by a motor mounting bracket. The output shaft of the geared motor is connected to the active impeller and drives the active impeller to rotate.

9. The multi-impeller shaft rotary discharge valve as described in claim 1, characterized in that: A rotation detector is provided on the side of either the active impeller or the driven impeller, and the rotation detector is installed and fixed by a rotation detector bracket.

10. The multi-impeller shaft rotary discharge valve as described in claim 9, characterized in that: The rotary detector is installed on the second side of the unloading valve housing.

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