CN105173786A - Rotary feeder sealed through air curtains - Google Patents

Abstract

The invention provides a rotary feeder sealed by an air curtain, which includes an arc-shaped impeller rotor, a casing, a pressure limiting valve, a material inlet and outlet, a rotary joint, an external bearing, large and small end covers, and a tapered sleeve. The arc impeller rotor is a hollow structure, on which arc plates are evenly distributed along the circumference; there is an axial gap between the tops of each adjacent two arc plates as the air flow channel for the axial sealing air curtain, and the inner and outer plates There is an annular gap between them as the air flow channel for the end face sealing air curtain. The hollow shaft, the arc face plate, the inner and outer plates are connected as a whole, and the arc impeller rotor is detachably connected through conical sleeves, studs, nuts, ring gaskets and arc grooves. Compared with the existing feeder, the sealing effect of the closed air curtain formed by the present invention is good, the rotor does not contact the inner surface of the housing, has no wear, the parts have a long service life, the rotor operates flexibly, and is easy to disassemble and clean. As a non-contact rotary seal feeding device, it realizes continuous conveying of materials.

Description

Rotary feeder sealed with air curtain

technical field

The invention relates to a rotary feeder, in particular to a rotary feeder sealed by an air curtain, and belongs to the technical field of material conveying equipment.

Background technique

Rotary feeder is also called rotary feeder and rotary feeder. Its internal key component is the rotor with multiple radial blades. The material in the upper bin falls by its own weight and fills the cavity between the blades. The material moves along with the rotor. The rotation is discharged from the lower material port. The rotary feeder is simple in structure and small in size. It is widely used in occasions requiring small pressure difference between the inlet and outlet. It is often used as an air-lock feeding device for closed conveying systems in industries such as tobacco, grain, cement, and road construction.

In order to ensure the flexible operation of the rotor, a certain gap must be left between the rotor and the housing, but materials can easily enter the gap and cause problems such as clogging and rotor jamming. The service life of the feeder is reduced. The existence of the above-mentioned gap between the rotor and the housing leads to poor sealing performance of the rotary feeder, sometimes forcing the feeding mode to be changed from continuous to intermittent, the process cannot be continuous, and the efficiency of the discharge is reduced. In order to enhance the sealing between the inlet and outlet, some rotary feeders add rubber sealing strips to the rotor. However, the rubber sealing strips will wear out after long-term use, and the abrasive particles will be mixed into the materials. This is obvious for food and other industries. is not allowed. In addition, after the rubber strip is worn out, it cannot be compensated in time, and it needs to be stopped and replaced regularly to ensure that the gap is sealed, which affects the production process. Therefore, it is of great practical significance for tobacco and food engineering to develop a rotary feeder that operates flexibly, does not jam, has good sealing performance, and meets food hygiene requirements.

Contents of the invention

The purpose of the present invention is to solve the problems of the existing rotary feeder, such as poor sealing, easy jamming, heavy cleaning and maintenance workload, and low feeding and discharging efficiency, to provide a kind of rotor and the inner surface of the housing that has no abrasion and good sealing performance. It is a rotary feeder with a novel structure sealed by an air curtain, which is easy to disassemble and clean, free from jamming, flexible in operation and high in work efficiency.

In order to achieve the above purpose, the technical solution adopted by the present invention is: a rotary feeder sealed by an air curtain, which consists of an arc-shaped impeller rotor, a casing, a pressure limiting valve, a material inlet and outlet, a rotary joint, an external bearing, a large and small It is composed of end cover, tapered sleeve, etc. It is characterized in that the arc impeller rotor is a hollow structure, which is composed of hollow shaft, arc plate, inner and outer plates connected by studs, nuts and ring gaskets; The circumferential direction of the arc surface impeller rotor is evenly distributed, and the inner plate is provided with arc grooves corresponding to the arc panels; there is an axial gap between the tops of each adjacent two arc panels, and the pressure gas is sprayed from the axial gap to the The inner surface of the shell forms a radial axial dynamic sealing air curtain; there is an annular gap between the inner and outer plates, and the pressure gas is sprayed from the annular gap to the inner surface of the shell to form a ring-shaped sealing air curtain. The two sides of the face impeller rotor realize the end face seal.

In the above solution, the inner and outer plates of the arc-shaped impeller rotor are respectively tightly fitted on the tapered sleeve; the inner plate has a waist-shaped hole, and the outer plate is provided with a limit block for controlling the distance between the inner and outer plates.

In the above solution, the housing has a hollow chamber structure in the shape of a revolving body, and the arc-shaped impeller rotor is located in the hollow chamber of the housing.

In the above solution, the hollow shaft of the arc-shaped impeller rotor is supported on the large end cover through an external bearing; the top of the housing is provided with a material inlet, and the bottom is provided with a material outlet.

In the above solution, the number of arc plates on the arc impeller rotor is 3 to 20.

In the above solution, one end of the hollow shaft is open and the other end is closed, and several elongated air grooves are opened on the hollow shaft between the two inner plates.

In the above scheme, the entire arc-shaped impeller rotor is detachably connected through conical sleeves, double-ended studs, nuts, ring gaskets, and arc-shaped grooves.

The beneficial effect of the invention is that: the pressure gas ejected from the axial gap at the top of the arc panel and the pressure gas ejected from the annular gap between the inner and outer plates form a special structure of closed air curtain seal. The ideal sealing effect can be achieved only by controlling the gas pressure and flow rate, which can prevent backflow and secondary crushing, and will not accumulate materials. The curved impeller rotor is not in contact with the inner surface of the shell, without wear and tear, and the service life of the parts is long; the processing requirements for the gap between the curved impeller rotor and the shell can be relaxed, which reduces the processing cost. Since the arc-shaped impeller rotor does not touch the shell, it operates flexibly and can be rotated forward or reversely; the feeding is uniform and continuous, and the work is reliable. The rotary feeder is a detachable structure, easy to disassemble and easy to clean. It is suitable for continuous conveying of bulk materials with high pressure, high temperature and complex material properties. It can be used as an upgraded product for rotary feeders that require high air tightness in industries such as food, medicinal materials, metallurgy, petrochemicals, building materials, and electric power.

Description of drawings

Fig. 1 is a structural representation of the present invention;

Fig. 2 is a schematic view of the arc-shaped impeller rotor of the present invention;

Fig. 3 is a schematic diagram of the internal structure of the curved impeller rotor of the present invention;

Fig. 4 is a structural schematic diagram of the tapered sleeve and the inner and outer plates of the present invention.

In the figure: 1. External bearing, 2. Small end cover, 3. Rotary joint, 4. Hollow shaft, 5. Large end cover, 6. Discharge port, 7. Shell, 8. Arc impeller rotor, 9 .Pressure limiting valve, 10. Feed port, 11. Tapered sleeve, 12. Nut, 13. Stud, 14. Ring gasket, 15. Air inlet, 16. Outer plate, 17. Annular gap, 18. Inner panel, 19. Arc panel, 20. Axial gap, 21. Long air groove, 22. Waist hole, 23. Arc groove, 24, 26. Stud hole, 25, 28. Taper Hole, 27. Limiting block.

Detailed ways

The present invention will be further described below in conjunction with the accompanying drawings.

As shown in Figures 1 to 4, the present invention utilizes the embodiment of the rotary feeder sealed by the air curtain, the rotary feeder is composed of an arc-shaped impeller rotor 8, a housing 7, a pressure limiting valve 9, a feed inlet 10, an outlet Material port 6, rotary joint 3, external bearing 1, small end cap 2, large end cap 5, tapered sleeve 11 and other components are assembled. The casing 7 has a hollow chamber structure in the shape of a revolving body, and the arc-shaped impeller rotor 8 is located in the hollow chamber of the casing 7; the top of the casing 7 is provided with a feed port 10, and the bottom is provided with a discharge port 6, and the large end cover 5 is located On both sides of the housing 7 , the hollow shaft 4 of the arc-shaped impeller rotor 8 is supported on the large end covers 5 on both sides through the external bearing 1 .

The inner plate 18 and the outer plate 16 of the curved impeller rotor 8 are respectively located at both ends of the hollow shaft 4 and tightly fitted on the tapered sleeve 11 . The inner plate 18 is provided with a waist-shaped hole 22 and is provided with an arc-shaped groove 23 corresponding to the arc panel 19 , and the outer plate is provided with a limit block 27 for controlling the distance between the inner plate 18 and the outer plate 16 .

The arc impeller rotor 8 is a hollow structure, which is formed by connecting the hollow shaft 4, the arc plate 19, the inner plate 18, and the outer plate 16 through studs 13, nuts 12 and ring gaskets 14. The circumferential direction of the impeller rotor 8 is evenly distributed; the arc panel 19 is stuck in the arc groove 23 on the two inner plates 18 , and the arc panel 19 is fixedly installed between the two inner plates 18 by studs 13 . The number of arc panels on the arc impeller rotor 8 is 3 to 20, and more panels can be selected according to specific conditions.

One end of the hollow shaft 4 is open, and the other end is closed, and the hollow shaft between the two inner plates 18 has a plurality of elongated air grooves 21 . The double-ended stud 13 passes through the stud holes 24 and 26 , and the tapered holes 25 and 28 are matched with the tapered sleeve 11 .

The entire curved impeller rotor 8 is detachably connected through a tapered sleeve 11, a double-ended stud 13, a nut 12, an annular gasket 14 and an arc groove 23, which is convenient for disassembly and cleaning.

There is an axial gap 20 between two adjacent arc panels 19, and the pressure gas ejected from the axial gap forms a radial axial dynamic sealing air curtain. An annular gap 17 is provided between the inner plate 18 and the outer plate 16. The space formed by the annular gap 17 is in the shape of a short cylinder. The pressure gas ejected from the annular gap 17 forms a ring-shaped sealing air curtain to realize the arc-shaped impeller rotor. 8 The sealing of the end faces on both sides. The gas can be compressed air, steam, cold wind, hot wind.

The sealing principle of the present invention is as follows: the pressure gas is introduced into the air inlet 15 of the hollow shaft 4 through the rotary joint 3, and enters the inner cavity of the arcuate impeller rotor 8 through the elongated air groove 21 on the hollow shaft 4. The pressurized gas is sprayed to the inner surface of the housing 7 through the axial gap 20 at the top of two adjacent arc panels 19, forming a dynamic sealing air curtain that is radial in the axial direction and rotates with the arc-shaped impeller rotor 8, realizing the axial The other way enters the annular gap 17 between the inner and outer plates through the waist-shaped holes 22 on the two inner plates 18, and sprays radially from the annular gap 17 to the inner surface of the housing 7 along the entire circumference to form a ring The sealing air curtain realizes the end face sealing on both sides of the arc impeller rotor 8. The synergistic effect of the two airflows ejected from the axial gap 20 and the annular gap 17 constitutes a closed air curtain, which realizes a good seal between the inlet and outlet. The rotary joint 3 communicates with the hollow shaft 4 , and its function is to provide gas to the rotating hollow shaft 4 .

When the present invention works, before the drive motor of the rotary feeder is started, the gas with a certain pressure and flow rate needs to be input into the air inlet 15 of the hollow shaft 4 through the rotary joint 3 . The motor drives the hollow shaft to rotate, driving the curved impeller rotor 8 to rotate in the casing 7, and the material falls into the casing 7 from the upper hopper of the casing 7 through the feed port 10, and is filled into the curved panel 19 of the curved impeller rotor 8 In the cavity between the casing 7 and the casing 7, the material is discharged from the discharge port 6 at the bottom of the casing 7 with the arc-shaped impeller rotor 8 rotating.

The invention is suitable for occasions where the sealing performance of the inlet and outlet is relatively high and regular cleaning is not required, and it is especially suitable as an air-lock feeding device for uniform and continuous delivery of food-grade and pharmaceutical-grade materials. It is tailor-made according to the work requirements, and it is expected to become a replacement product for rotary feeders in industries such as medicinal materials, food, metallurgy, petrochemicals, building materials, and electric power.

The above embodiments are only used to illustrate the technical solution of the present invention without limitation. Other modifications or equivalent replacements made by those skilled in the art to the technical solution of the present invention should be covered as long as they do not depart from the spirit and scope of the technical solution of the present invention. Within the protection scope of the claims of the present invention.

Claims (7)

1. A rotary feeder sealed by an air curtain, consisting of an arc-shaped impeller rotor (8), a housing (7), a pressure limiting valve (9), a feed port (10), a discharge port (6), Composed of rotary joint (3), external bearing (1), small end cover (2), large end cover (5), tapered sleeve (11), etc., it is characterized in that the arc-shaped impeller rotor (8) is a hollow structure , it consists of a hollow shaft (4), an arc panel (19), an inner panel (18), and an outer panel (16) connected by studs (13), nuts (12) and ring gaskets (14); The arc panels (19) are evenly distributed in the circumferential direction of the arc impeller rotor (8), and the inner panel (18) is provided with arc grooves (23) corresponding to the arc panels (19); two adjacent arc panels (19 ) is provided with an axial gap (20) between the tops, and the pressure gas is sprayed to the inner surface of the housing (7) from the axial gap (20) to form a radial axial dynamic sealing air curtain; the inner plate (18) An annular gap (17) is provided between the outer plate (16), and the pressure gas is sprayed from the annular gap (17) to the inner surface of the housing (7), forming an annular airtight curtain. 2. The rotary feeder utilizing air curtain sealing according to claim 1, characterized in that, said inner board (18) and outer board (16) are respectively tightly sleeved on said tapered sleeve (11); Have a waist-shaped hole (22) on the inner board (18), and be provided with the limiting block (27) that controls the distance between the inner board (18) and the outer board (16) on the outer board (16). 3. The rotary feeder sealed by air curtain according to claim 1, characterized in that, the housing (7) has a hollow chamber structure in the shape of a revolving body, and the arc-shaped impeller rotor (8) is located in the In the hollow chamber of the housing (7). 4. The rotary feeder utilizing an air curtain seal according to claim 1, characterized in that, the hollow shaft (4) of the arc-shaped impeller rotor (8) is supported by the external bearing (1) on the On the large end cover (5); the top of the housing (7) is provided with a feed port (10), and the bottom is provided with a discharge port (6). 5. The rotary feeder sealed with an air curtain according to claim 1, characterized in that the number of arc panels (19) on the arc impeller rotor (8) is 3 to 20. 6. The rotary feeder sealed by air curtain according to claim 1, characterized in that, one end of the hollow shaft (4) is open, the other end is closed, and the hollow shaft between the two inner plates (18) Have some elongated air grooves (21) on the shaft. 7. The rotary feeder utilizing air curtain sealing according to claim 1, characterized in that, the arc-shaped impeller rotor (8) passes through a tapered sleeve (11), a double-ended stud (13), a nut ( 12), ring gasket (14) and arc groove (23) etc. are connected in a detachable manner.