JP6529227B2 - Particulate transfer device - Google Patents

Description

  The present invention relates to a granular material conveying device for conveying granular material, in particular, a granular material conveying device using powder having extremely fine particle size and wearability under a pressure difference at the inlet and outlet of the granular device. About.

  2. Description of the Related Art A rotary valve is conventionally used as a granular material carrier for continuously supplying (quantitative discharge) powdery particles and the like continuously. For example, as disclosed in Patent Document 1, this rotary valve rotatably supports a rotor having a plurality of rotor blades radially attached in a casing opened at the top and bottom, and the rotor shaft of the rotor is a motor or the like. The granular material which is rotated by the driving means and dropped and supplied to the upper opening by gravity is held in the accommodation space formed between the rotor blades and discharged from the lower opening.

  Such a rotary valve has a function of easily controlling the amount of supply by changing the rotor rotational speed, and is widely used as a quantitative supply of various types of powder and granular materials, but in an environment where the pressure in the casing is high. When used, for example, high-seal rotary valves proposed in Patent Document 2 and Patent Document 3 and the like are known so that internal powder particles do not leak out of the casing due to pressure in the casing. These high-sealed rotary valves have a structure to seal the casing in a highly airtight manner, and fix a pair of side plates at intervals in the axial direction of the rotor shaft so as to sandwich the rotor fixed to the rotor shaft. A leak preventing ring is provided in contact with the outer surface of the plate, and the leak preventing ring is configured to be pressed against the outer surface of each side plate by pressurized air.

  The rotary valve provided with the side plate shown in Patent Documents 2 and 3 intrudes into the clearance between the side plate and the inner peripheral surface of the casing opposed to the side plate because the side plate rotates endlessly in the same plane. The powder can not escape and is compacted to act as a brake on the rotor, and the frictional heat causes the side plates and casing to be rubbed and damaged prematurely. As a technique for escaping such granular material that has entered the clearance between the side plate and the casing, for example, in Patent Document 4, it is located on the outer peripheral surface of the side plate and alternated inward and outward thereof. There has been proposed a rotary valve which is formed to have a slit formed therein to release the powdery matter that has entered the clearance between the outer peripheral surface of the side plate and the inner peripheral surface of the casing.

Japanese Patent Application Laid-Open No. 2001-135962 Unexamined-Japanese-Patent No. 1-197225 gazette Unexamined-Japanese-Patent No. 2006-76766 JP 2001-225956 A

  By the way, there is also an open type rotor which does not have a side plate like patent documents 2-4 as a rotary valve. For example, as shown in FIG. 9, such an open type rotor 100 is provided with a hollow boss 101 in which a plurality of rotor blades 102 are radially fixed, and the boss 101 is externally mounted on a rotor shaft 103. By forming a key groove on the rotor shaft 103 and fitting a key (not shown) in the key groove, the boss 101 and the rotor shaft 103 are integrally rotated. The rotor shaft 103 is inserted into the through hole 105 formed in the stuffing box 104, and the rotor shaft 103 is axially supported by a bearing member on a bearing or the like so that the rotor blade 102 is rotatably disposed in the rotor chamber.

  Such an open type rotor 100 in which both sides of the rotor 100 are opened has a structure in which the left and right side edges of the radial rotor blades 102 are opposed to the stuffing box 104. The gap between each rotor blade 102 changes dynamically (hereinafter referred to as a non-fixed gap, ie, a dynamic gap), and the powder particles are accumulated in the clearance between the stuffing box 104 and each rotor blade 102 structurally. Absent. However, in the open type rotor 100, when the hollow boss 101 to which the rotor blade 102 is fixed is externally mounted on the rotor shaft 103 and the rotor shaft 103 is inserted into the through hole 105 formed in the stuffing box 104, as shown in FIG. Thus, on the inner surface side of the stuffing box 104, a step is generated structurally at the boundary between the boss 101 and the rotor shaft 103, and the clearance a between the outer end face of the boss 101 and the inner wall of the stuffing box 104 caused by this step Is constant and does not change as the rotor 100 rotates (hereinafter referred to as a fixed gap, ie, a static gap). For this reason, when the granular material gets into the clearance a between the boss 101 and the stuffing box 104 which is a static clearance, the inlet and the outlet which are generated when the rotary valve functions in the clearance a forming the static clearance. The pressure difference allows the powder to pass at a high speed, and wears the boss 101 and the stuffing box 104 that make up the clearance a. Furthermore, the flow of air (air flow) generated by the powder particles that are about to fall downward from around the rotor 100 mixes with the air (air flow) that is about to enter the rotor, and the flow of powder particles causes the supply of the rotary valve. Since a pressure difference is generated between the side and the discharge side, and the powder (particles) in which air (air flow) is mixed and lightened in the casing is likely to enter a very narrow gap between the boss 101 and the stuffing box 104 The wear of the bosses 101 and the stuffing box 104 by the particles becomes even more remarkable.

  Furthermore, since the clearance a between the boss 101 and the stuffing box 104 is in communication with the clearance a1 between the through hole 105 and the rotor shaft 103, the powder particles that enter the clearance a are the through hole 105 and the rotor Intruding into the clearance a1 between the shaft 103 and the rotor shaft 103 with the seal packing 106 for sealing the rotor shaft 103 and further deteriorating the sealability of the rotor shaft 103 It was

  The present invention has been made in view of the above problems, and the powder and granular material is pumped at high speed to the clearance between the rotor and the stuffing box including the rotor shaft without the static gap between the rotor and the stuffing box, and the wear is caused. It is an object of the present invention to provide a granular material carrier capable of performing stable continuous operation without causing

The powder and granular material transport apparatus 1 according to claim 1 comprises a casing 2 having a supply unit 3 and a discharge unit 4 of powder and granular material, and a plurality of rotor blades 12 between the supply unit 3 and the discharge unit 4. And a through hole 20 provided in the casing 2 for inserting the rotor 10 from the inside of the rotor chamber 5 to the outside of the rotor chamber 5, and integrally with the rotor 10. The rotating portion (without the reference numeral) which rotates is inserted into the through hole 20,
The hollow boss 11 to which the plurality of rotor blades 12 are fixed is fixed to the rotor shaft 14, and the hollow sleeve 15 as the rotating portion is connected to the boss 11 to be fixed to the rotor shaft 14 The sleeve 15 is formed to be larger in diameter than the boss 11, and the sleeve is inserted into the through hole 20 so that the boundary between the boss 11 and the sleeve 15 is substantially flush with the inner wall surface of the casing.
The recess 25 and the recess 26 are formed on the outer periphery of the sleeve 15 opposed to the inner peripheral surface of the through hole 20, and the outer peripheral surface of the rotating portion opposed to the through hole 20 is penetrated as the rotating portion rotates. A concave portion 25 and a convex portion 26 in which a gap with the hole 20 changes intermittently are formed, and a clearance between the through hole 20 and the rotating portion is uneven, and thus the through hole the outer peripheral surface of the sleeve 15 facing the inner peripheral surface 20 to form a plurality of recesses 25 and protrusions 26 a plurality of recesses 25 and protrusions 26 are configured alongside intermittently in the circumferential direction of the sleeve 15,
The groove width in the circumferential direction of the recess 25 corresponds to the interval between the rotor blades 12 formed in the boss 11, and the protrusion 26 formed between the adjacent recesses 25 corresponds to each rotor blade 12, It has a width corresponding to its thickness,
Furthermore, the recess 25 is characterized in that it is opened at the inner end of the sleeve 15 and is opened at the inside of the rotor chamber 5 .
The reference numerals are not intended to limit the present invention, but are given to facilitate understanding of the invention.

  The granular material conveyance device according to claim 4 is characterized in that a rotating portion in which the boss and the sleeve are integrated is provided on the rotor shaft.

  In the granular material carrier according to claim 5, the rotating portion is constituted by a rotor blade, and each rotor blade is inserted into a through hole formed in the casing, and both ends of the rotor blade are disposed outside the rotor. A disk-shaped side plate for integrating the rotor blades and a cylindrical portion axially connected to the rotor blades from the side plate are provided, and the cylindrical portion is sealed with a shaft sealing member. It is characterized by having done.

  According to the granular material transfer apparatus of the present invention, when the rotating portion is inserted into the through hole and the rotor blade is rotatably disposed in the rotor chamber, the plurality of recesses formed on the outer periphery of the rotating portion along with the rotation of the rotor The recess rotates to dynamically change the clearance between the inner circumferential surface and the rotating portion in the through hole. As a result, the powder particles are pumped at high speed to the clearance between the rotor and the casing, and damage to the inner wall and the shaft seal portion due to the frictional heat of the powder particles can be effectively prevented without causing wear. .

BRIEF DESCRIPTION OF THE DRAWINGS It is sectional drawing which looked at the rotary valve which shows Example 1 of this invention from the front direction. It is a fragmentary sectional view which looked at a rotary valve from the side direction same as the above. It is a disassembled perspective view of a rotor and a sleeve same as the above. It is an expanded sectional view of an important section same as the above. It is sectional drawing of the through-hole part seen from the same as the circumferential direction. It is an expanded sectional view of an important section of Example 2 of the present invention. It is a perspective view of a rotor same as the above. It is a perspective view of the principal part of Example 3 of this invention. It is an expanded sectional view of the principal part which shows a prior art example.

  Hereinafter, the present invention is applied to a rotary valve as a particulate and particulate material transport device, and a specific application thereof will be described by taking a case where it is used for a supply mechanism (discharge mechanism) of combustion coal ash as an example.

  A first embodiment of the present invention will be described with reference to FIGS. 1 to 5. In the description of the embodiment, terms in the vertical direction mean directions in all the drawings, and terms in the horizontal direction mean directions in FIG.

  The entire structure will be described with reference to FIGS. 1 and 2. The rotary valve 1 includes a casing 2 and a rotor 10 that are open at the top and bottom, and the casing 2 has an upper opening, a supply opening 3 and a lower opening. An exhaust port 4 is formed, and a cylindrical rotor chamber 5 in which the rotor 10 is rotated is formed between the supply port 3 and the exhaust port 4. The left and right openings of the rotor chamber 5 are sealed by a pair of left and right stuffing boxes 6, 6 which function as side walls of the casing 2.

  The rotor 10 is configured by radially fixing a plurality of rotor blades 12 on the outer periphery of a hollow boss 11, the boss 11 is sheathed on a rotor shaft 14, and both ends of the rotor shaft 14 are described as rotating portions. The hollow sleeves 15 and 15 are encased so as to be continuous with the boss 11. The sleeves 15 and 15 and the rotor shaft 14 are integrated by a plurality of screws 16, and the boss 11 and the rotor shaft 14 are engaged with the key groove 14A formed on the boss 11 and the rotor shaft 14 to fit the key 14B. 14 and the boss 11 are integrally rotated. Further, the rotor shaft 14 has its axial core in the horizontal direction (left and right direction in FIG. 1) so that the rotor blade 12 rotates in the rotor chamber 5, and the sleeves 15 and 15 mounted on the rotor shaft 14 are It is made to project from the through-hole 20 formed in the staffing boxes 6 and 6 of the said rotor chamber 5. As shown in FIG.

  A plurality of gland packings 21 are assembled to the stuffing boxes 6, 6 as shaft seal members for sealing the outer periphery of the sleeves 15, 15, and the rotor shafts projecting from the sleeves 15, 15 outside the stuffing boxes 6, 6. A bearing unit 22 supporting the shaft 14 is fixed. Further, one end of the rotor shaft 14 is protruded from the bearing unit 22 to the outside, and a sprocket 24 connected to a drive source 23 such as a motor is fixed to the tip end thereof.

  As described above, the bosses 11 to which the rotor blades 12 are radially fixed and the sleeves 15 and 15 are integrally and continuously fixed to the rotor shaft 14 as shown in FIG. In the present embodiment, the sleeves 15 and 15 have an outer diameter of approximately 150 mm and the boss 11 is set approximately 140 mm, and the difference in diameter between the sleeves 15 and 15 and the boss 11 makes a step about 5 mm. Will occur. Further, a plurality of recesses 25 corresponding to the steps are located on the inner end face of the sleeves 15, 15 where the boundary portion between the sleeves 15, 15 and the boss 11 is continuous with the inner wall of the stuffing box 6, 6. The sleeves 15 are formed side by side in the circumferential direction of the sleeve 15. The groove width (circumferential direction) of each recess 25 corresponds to the distance between each rotor blade 12 formed in the boss 11, and the protrusion 26 formed between each adjacent recess 25 corresponds to each rotor blade 12, It has a width corresponding to the plate thickness. Furthermore, the depth of each recess 25 has a step difference between the sleeves 15 and 15 and the boss 11, that is, a depth of about 5 mm in this embodiment, and the axial length of each recess 25 is a through hole 20. It corresponds to the opposite length. Thereby, the outer peripheral surface of the sleeves 15 and 15 and the bottom portion of each recess 25 are continuous, and each recess 25 faces the inner peripheral surface of the through hole 20 so that each recess 25 is opened in the casing 2. Furthermore, the concave portions 25 and the convex portions 26 are intermittently formed in the circumferential direction so as to face the inner peripheral surface of the through hole 20, and the clearance between the through hole 20 and the sleeves 15 becomes uneven. Therefore, due to the rotation of the sleeves 15, 15, the clearance S1 between the through hole 20 and the sleeves 15, 15 becomes a dynamic gap. In the present embodiment, the clearance S1 between the through hole 20 and the sleeves 15 and 15 is approximately 0.2 mm, and the clearance S between the rotor blade 12 and the stuffing boxes 6 and 6 is approximately 0.15 to 0.2 mm. is there.

  As described above, according to the present invention, the boundary between the sleeves 15 and 15 and the boss 11 is continuous with the inner wall of the stuffing box 6 and 6, and the sleeves 15 and 15 are formed larger than the boss 11 in FIG. As shown, there is no static gap between the bosses 11 forming a part of the rotor 10 and the stuffing boxes 6 and 6 functioning as the inner wall of the rotor chamber 5 such that the granular material intrudes. Furthermore, as shown in FIG. 5, a plurality of recesses 25 are formed on the outer peripheral surface of the sleeve 15 facing the inner peripheral surface of the through hole 20, and the plurality of recesses 25 and protrusions in the circumferential direction of the sleeve 15 26, and the inner circumferential surface of the through hole 20 and the outer circumferential surface of the sleeve 15, 15 become a dynamic gap as the rotor shaft 14 rotates, so the clearance between the through hole 20 and the sleeve 15, 15 It is a structure where powder particles are hard to be accumulated in S1, and even if powder particles intrude into clearance SI between through hole 20 and sleeves 15, 15, clearance SI is formed on the outer peripheral surface of sleeves 15, 15. Since the recess 25 communicates with the recess 25 and the recess 25 opens into the rotor chamber 5, the powder particles can escape from the recess 25 into the rotor chamber 5 and can be discharged. For this reason, the infiltrating particles are accumulated in the clearance S1 and act as a brake of the rotor shaft 14, and the stuffing boxes 6, 6 and the sleeves 15, 15 constituting the inner wall of the rotor chamber 5 by the friction of the particles Damage to the sealing gland packing 21 is prevented, and stable and continuous operation of the rotary valve becomes possible.

  6 and 7 show a second embodiment of the present invention, in which parts having the same functions as in the first embodiment are given the same reference numerals, duplicate parts are omitted, and only different parts will be described.

  In the first embodiment, an example is shown in which the sleeves 15 and 15 fixed to the rotor shaft 14 are inserted through the through hole 20 as the rotating portion. However, in the present embodiment, the rotating portion is configured by the rotor blade 31 and the rotor chamber The side opening portion 5 is sealed by a side wall portion 40, and a stuffing box 6 to which the gland packing 21 is assembled is fixed to the outer surface side of the side wall portion 40.

  That is, in the present embodiment, the radial rotor blades 31 are fixed to the bosses 11, and the rotor blades 31 are protruded from the through holes 41 formed in the side wall portion 40 to the outside of the rotor. Further, as shown in FIG. 6, the rotor 30 of the present embodiment has a disk-shaped side plate portion 32 outside the rotor blade 31. Then, the side edge of each rotor blade 31 abuts the side plate portion 32 to integrate the side plate portion 32 and each rotor blade 31, and the outer edge portion of the side plate portion 32 is continuous with the outer edge of each rotor blade 31. The cylindrical portion 33 is integrally formed so as to extend in the axial direction, and the outer periphery of the cylindrical portion 33 is axially sealed by a gland packing 21 assembled to the stuffing boxes 6, 6. Further, bearing holes 35 of the rotor shaft 14 are formed in the stuffing boxes 6, 6, and the rotor shaft 14 is rotatably supported by a bearing member 36 provided on the inner peripheral surface of the bearing hole 35.

  In the present embodiment configured as described above, the rotor blade 31 is rotatably disposed facing the through hole 41 formed in the side wall portion 40. Since the rotor blades 31 are radially fixed to the bosses 11 and spaces are formed between the adjacent rotor blades 31, the clearance between the through holes 41 and the rotor blades 31 is uneven as in the first embodiment. As the rotor blade 31 rotates, the gap between the through hole 41 and the rotor blade 31 dynamically changes. As a result, as in the first embodiment, it is difficult for particulates to accumulate in the clearance between the through hole 41 and the rotor blade 31. Further, the side plate open portion of the rotor 30 is closed by the side plate portion 32 and the cylindrical portion 33 continuous with the side plate portion 32 is axially sealed by the gland packing 21, which is located in the through hole 41. Penetration of the particulate matter into the space between the cylindrical portion 33 and the gland packing 21 is also suppressed, and damage to the shaft seal portion due to the particulate matter can be effectively prevented.

  As mentioned above, although the Example of this invention was explained in full detail, this invention is not limited to said each Example, Various deformation | transformation implementation is possible within the range of the summary of this invention. For example, although the case where it used for the supply mechanism (discharge mechanism) of combustion coal ash as an application of a rotary valve was explained as an example in each above-mentioned example, various granular materials provided with various rotary valves and a shaft seal part It is widely available to processing machines. For example, the present invention can be widely applied as various types of particulate material transfer devices such as screw conveyors, butterfly valves, gate valves, ball valves, and flap dampers as well as rotary valves. Further, the basic structure of the rotary valve is not limited to the above embodiment, and may be selected as appropriate. Furthermore, in FIG. 1, although the example which divided | segmented the boss | hub 11 and the sleeve 16 was shown, as shown in FIG. 8, the structure which unifies the boss | hub 50 and the sleeve 51 and comprises a rotation part may be sufficient.

1 Rotary valve (powder and particulate material transfer device)
2 casing 3 supply port (supply part)
4 Discharge port (discharge part)
Reference Signs List 5 rotor chamber 10, 30 rotor 11, 50 boss 12 rotor blade 14 rotor shaft 16, 51 sleeve (rotary portion)
20, 41 through hole 21 ground packing 25 concave portion 26 convex portion 31 rotor blade (rotary portion)
32 side plate portion 33 cylindrical portion

Claims (3)

A casing provided with a supply portion and a discharge portion of powder and granular material, a rotor having a plurality of rotor blades and rotatably provided between the supply portion and the discharge portion, and the rotor from the rotor chamber to the rotor outside And a through hole provided in the casing for insertion, and a rotating portion integrally rotating with the rotor is inserted through the through hole,
A hollow boss to which the plurality of rotor blades are fixed is fixed to the rotor shaft, and a hollow sleeve as the rotating portion is connected to the boss and fixed to the rotor shaft, and this sleeve is fixed in diameter from the boss The sleeve is inserted into the through hole so that the boundary portion between the boss and the sleeve is substantially flush with the inner wall surface of the casing while being large.
Forming a concave portion and convex portion on the outer periphery of the sleeve which faces the inner circumferential surface of the through hole, the gap between the through-hole with the rotation of the rotating section on the outer peripheral surface of the rotating portion opposite to the through hole Are formed so as to form concave and convex portions that change intermittently, and the clearance between the through hole and the rotating portion is formed to be uneven, and thus the inner periphery of the through hole is formed. a plurality of concave portions and convex portions are configured alongside intermittently in the circumferential direction of the sleeve by the forming the plurality of recessed portions and projected portions on the outer peripheral surface of the sleeve which faces the surface,
The groove width in the circumferential direction of the recess corresponds to the interval between each rotor blade formed in the boss, and the protrusion formed between the adjacent recesses corresponds to each rotor blade and corresponds to the thickness thereof Have a width,
Furthermore, the recess is formed to open at the inner end of the sleeve and open to the inside of the rotor chamber .   The granular material carrier according to claim 1, wherein a rotating portion in which the boss and the sleeve are integrated is provided on the rotor shaft.   The rotating portion is constituted by a rotor blade, and each of the rotor blades is inserted into a through hole formed in the casing, and both ends of the rotor blade are disposed outside the rotor and a disk shape integrating the respective rotor blades A side plate and a cylindrical portion axially continuous from the side plate so as to be continuous with the rotor blades are provided, and the cylindrical portion is sealed by a shaft sealing member. Particulate transport device.

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