Sealed leakage-free screw conveyer

Abstract

The utility model discloses a sealed leakage-free screw conveyer which comprises a conveying screw shaft, a conveying machine shell, an end cover of the conveying machine shell, a conveying support and a sealing device arranged between the end cover and the conveying screw shaft. At least one inner side sealing packing, a plurality of outer side sealing packing and an air sealing ring located between the inner side sealing packing and the outer side sealing packing are installed between an inner hole of a sealing seat body of the sealing device and a conveying screw shaft, and an air sealing ring groove is formed in the inner wall of the air sealing ring and communicated with a ventilation connector hole in the sealing seat body through an air inlet hole. An elastic sealing wing ring is embedded between the air inlet hole in the air sealing ring groove and the end, attached to the inner side sealing packing, of the air sealing ring, at least one annular sealing wing is arranged on the inner wall of the elastic sealing wing ring, and the inner edge of the annular sealing wing is elastically attached to the conveying screw shaft and inclines towards the end where the inner side sealing packing is located. The sealed leakage-free spiral conveyor can prevent conveyed powdery materials from entering the sealing device as much as possible, and the service life of the sealing device of the conveyor is prolonged.

Description

Technical Field

[0001] The utility model relates to a conveying device, in particular to a spiral conveying device for powdery materials. Background Art

[0002] Screw conveyor is one of the preferred equipment for conveying powdered materials. The powdered materials are pushed in the closed casing by the conveying screw during the conveying process from the feed port to the discharge port of the conveyor, which can effectively prevent the leakage of powdered materials and avoid possible dust pollution and harm to operators. However, the conveying screw shaft of the screw conveyor must rotate relative to the casing. There will inevitably be a radial gap where the conveying screw extends out of the casing. This will be the part where the conveyed powdered materials may leak from the screw conveyor. Therefore, a sealing device needs to be installed between the conveying screw and the casing. However, for powdered materials, conventional sealing devices are difficult to maintain sealing reliability and a long service life of the seals due to the grinding effect of dust on the sealing elements. Utility Model Content

[0003] In view of the above-mentioned deficiencies in the prior art, the technical problem to be solved by the present invention is to provide a sealed and leak-free screw conveyor, which can prevent the conveyed powdered materials from entering the sealing device as much as possible and improve the service life of the conveyor sealing device.

[0004] In order to solve the above technical problems, the utility model provides a sealed leak-free screw conveyor, comprising a conveying screw shaft and a conveyor housing connected to a driving device, wherein the conveying screw shaft is rotatably supported on conveying brackets at both ends, and the conveyor housing is fixedly supported on the conveying brackets through end covers at both ends, and a sealing device is provided between the end covers and the conveying screw shaft, the sealing device comprising a sealing seat body, the sealing seat body being fixedly connected to the end covers, and at least one inner sealing packing and several outer sealing packings being installed in the annular cavity between the inner hole of the sealing seat body and the conveying screw shaft A sealing packing, an air sealing ring is provided between the inner sealing packing and the outer sealing packing, an air sealing ring groove is provided on the inner wall of the air sealing ring, the air sealing ring groove is connected with the vent joint hole on the sealing seat body through the air inlet hole on the air sealing ring wall, an elastic sealing wing ring is embedded in the air sealing ring groove, the elastic sealing wing ring is located between one end of the air sealing ring that fits the inner sealing packing and the air inlet hole, at least one annular sealing wing is provided on the inner wall of the elastic sealing wing ring, the inner edge of the annular sealing wing is elastically fitted with the conveying spiral shaft and is oblique to the end where the inner sealing packing is located.

[0005] After adopting the above technical scheme, the air-sealing ring provided between the inner sealing packing and the outer sealing packing in the sealing device can be connected with an external air pressure source, and the gas with a certain pressure enters the annular cavity between the air-sealing ring groove and the conveying spiral shaft, forming a relatively high pressure on the conveyed material in the conveyor casing, and preventing the conveyed powdered material from entering the sealing device through the radial gap between the conveying spiral and the inner sealing packing. The elastic sealing wing ring embedded in the air-sealing ring groove forms a one-way channel between the left and right sides of the annular sealing wing through the annular sealing wing on it that elastically fits the conveying spiral shaft and is inclined to the end where the inner sealing packing is located. When the pressure on both sides of the annular sealing wing is equal, the inner ring of the annular sealing wing will rely on its own elasticity to fit on the conveying spiral shaft, making it impossible for the left and right sides to communicate, and the conveyed Even if the powdered material enters the area where the elastic sealing wing ring is located from the inner sealing packing, it will no longer enter the air-sealing ring groove on the side where the air inlet hole is located. When the air pressure on the side where the air inlet hole is located is greater than the pressure on the other side of the annular sealing wing, the pressure difference will cause the annular sealing wing to overcome its own elastic force and break away from the fitting state with the conveying spiral shaft. The gas enters the other side of the annular sealing wing through the gap between the annular sealing wing and the conveying spiral shaft until the pressure on the left and right sides of the annular sealing wing is balanced, and the inner ring of the annular sealing wing is re-fitted with the conveying spiral shaft. In this process, the powdered material cannot leak outward against the airflow, thereby avoiding the powdered material being conveyed from entering the sealing device and leaking outward. As long as the air-sealing ring groove is connected to the air pressure source, the good sealing performance can be maintained, thereby improving the service life of the conveyor sealing device.

[0006] In a preferred embodiment of the present invention, two inner sealing packings and five outer sealing packings are installed in the annular cavity between the inner hole of the sealing seat and the conveying screw shaft. With this embodiment, the two inner sealing packings can maximize the sealing function of the sealing packing, while the five outer sealing packings can better prevent the leakage of powdered materials.

[0007] Another preferred embodiment of the present invention comprises a circumferential groove formed on the outer periphery of the gas seal ring. Three to eight air inlet holes are evenly distributed along the circumference of the gas seal ring wall within the circumferential groove, and a venting connection hole is provided on the seal seat. This embodiment allows gas at a certain pressure to enter the gas seal ring groove more smoothly and evenly.

[0008] Another preferred embodiment of the present invention is to provide two annular sealing wings on the inner wall of the elastic sealing wing ring. In this embodiment, the two annular sealing wings will form two one-way channels, resulting in a better sealing effect.

[0009] In a further preferred embodiment of the present invention, the elastic sealing wing ring is a wear-resistant rubber product. With this embodiment, the wear-resistant rubber product has the required elasticity and also has certain wear resistance, which can meet the use requirements of the elastic sealing wing ring.

[0010] In another further preferred embodiment of the present invention, an outer elastic sealing wing ring is further embedded in the air-sealing ring groove. The outer elastic sealing wing ring is located between one end of the air-sealing ring that is in contact with the outer sealing packing and the air inlet. At least one annular sealing wing is provided on the inner wall of the outer elastic sealing wing ring. The inner edge of the annular sealing wing is elastically in contact with the conveying screw shaft and is obliquely disposed toward the end where the inner sealing packing is located. With this embodiment, the inner edge of the annular sealing wing provided on the inner wall of the outer elastic sealing wing ring, which is obliquely disposed toward the end where the inner sealing packing is located and is elastically in contact with the conveying screw shaft, will continue to maintain contact with the conveying screw shaft under the action of the air pressure in the air-sealing ring groove, thereby preventing the powdered material being conveyed from further leaking outward if it is possible to enter the air-sealing ring groove, thereby providing an additional safeguard for the sealed and leak-free conveying of the powdered material being conveyed.

[0011] In another preferred embodiment of the present invention, an annular sealing wing is provided on the inner wall of the outer elastic sealing wing ring. In this embodiment, an annular sealing wing is provided on the inner wall of the outer elastic sealing wing ring to prevent leakage of powdered materials.

[0012] In a further preferred embodiment of the present invention, the outer elastic sealing wing ring is a wear-resistant rubber product. With this embodiment, the wear-resistant rubber product has the required elasticity and a certain wear resistance, which can meet the use requirements of the outer elastic sealing wing ring. BRIEF DESCRIPTION OF THE DRAWINGS

[0013] The sealed and leak-free screw conveyor of the present invention will be further described in detail below with reference to the accompanying drawings and specific embodiments.

[0014] Figure 1 This is a structural diagram of a specific embodiment of the utility model sealed leak-free screw conveyor;

[0015] Figure 2 yes Figure 1 A schematic structural diagram of the sealing device in the structure shown;

[0016] Figure 3 yes Figure 2 Schematic diagram of the gas seal ring and related components in the structure shown;

[0017] Figure 4 yes Figure 1 A schematic structural diagram of another embodiment of the sealing device in the structure shown;

[0018] Figure 5 yes Figure 4 Schematic diagram of the gas seal ring and related components in the shown structure.

[0019] In the figure: 1-sealing device, 11-sealing seat, 12-inner sealing packing, 13-gas sealing ring, 14-elastic sealing wing ring, 15-venting joint hole, 16-air inlet hole, 17-gas sealing ring groove, 18-outer sealing packing, 19-annular sealing wing, 20-outer elastic sealing wing ring, 2-end cover, 3-conveying bracket, 4-conveying screw shaft, 5-conveying casing, 6-driving device. DETAILED DESCRIPTION

[0020] exist Figure 1 In the sealed, leak-free screw conveyor shown, the conveyor housing 5 is fixedly supported on the conveying bracket 3 through the end covers 2 at both ends. A feed interface and a discharge interface are respectively provided at both ends of the conveyor housing 5. The conveying screw shaft 4 in the conveyor housing 5 is transmission-connected to the driving device 6. The two ends of the conveying screw shaft 4 pass through the end covers 2 at both ends of the conveyor housing 5 and are rotatably supported on the conveying bracket 3 at both ends. A sealing device 1 is respectively provided between the end covers 2 at both ends and the conveying screw shaft 4, see Figure 2 The sealing device 1 includes a sealing seat body 11, which is fixedly connected to the corresponding end cover 2. At least one inner sealing packing 12 and several outer sealing packings 18 are installed in the annular cavity between the inner hole of the sealing seat body 11 and the conveying screw shaft 4. Preferably, two inner sealing packings 12 and five outer sealing packings 18 are installed in the annular cavity between the inner hole of the sealing seat body 11 and the conveying screw shaft 4; an air seal ring 13 is provided between the inner sealing packing 12 and the outer sealing packing 18, and an air seal ring groove 17 is provided on the inner wall of the air seal ring 13, see Figure 3 The air-sealing ring groove 17 is connected to the vent joint hole 15 on the sealing seat body 11 through the air inlet hole 16 on the air-sealing ring wall. Preferably, a circumferential annular groove is provided on the outer periphery of the air-sealing ring 13, and 3-8 air inlet holes 16 are evenly distributed circumferentially on the air-sealing ring wall in the circumferential annular groove, and a vent joint hole 15 is provided on the sealing seat body 11; an elastic sealing wing ring 14 is embedded in the air-sealing ring groove 17, and the elastic sealing wing ring 14 is preferably made of wear-resistant rubber. The elastic sealing wing ring 14 is located on the air-sealing ring 13 between one end of the inner sealing packing 12 and the air inlet hole 16, and at least one annular sealing wing 19 is provided on the inner wall of the elastic sealing wing ring 14, preferably two. The annular sealing wing 19 relies on its own elasticity to make its inner edge elastically fit with the outer periphery of the conveying spiral shaft 4, and the annular sealing wing 19 is a conical ring, and its inner ring is inclined toward the end where the inner sealing packing 12 is located. Figure 4 and Figure 5Another embodiment of the sealing device 1 is shown. In this embodiment, in addition to the elastic sealing wing ring 14 embedded in the air sealing ring groove 17 of the air sealing ring 13 as described above, an outer elastic sealing wing ring 20 is also embedded. The outer elastic sealing wing ring 20 is also a wear-resistant rubber product. The outer elastic sealing wing ring 20 is located on the air sealing ring 13 between one end of the outer sealing packing 18 and the air inlet 16. At least one annular sealing wing 19 is provided on the inner wall of the outer elastic sealing wing ring 20, preferably the one shown in the figure. The inner edge of the annular sealing wing 19 is also elastically fitted with the conveying spiral shaft 4 and is inclined toward the end where the inner sealing packing 12 is located.

[0021] The above only lists some preferred embodiments of the present invention, but the present invention is not limited thereto and many improvements and modifications can be made. As long as the improvements and modifications are made based on the basic principles of the present invention, they should be considered to fall within the scope of protection of the present invention.

Claims

1. A sealed, leak-free screw conveyor, comprising a conveying screw shaft (4) and a conveyor housing (5) connected in a transmission manner to a driving device (6), wherein the conveying screw shaft (4) is rotatably supported on conveying brackets (3) at both ends, and the conveyor housing (5) is fixedly supported on the conveying brackets (3) through end caps (2) at both ends, characterized in that: A sealing device (1) is provided between the end cover (2) and the conveying screw shaft (4), the sealing device (1) comprising a sealing seat body (11), the sealing seat body (11) being fixedly connected to the end cover (2), at least one inner sealing packing (12) and a plurality of outer sealing packings (18) being installed in the annular cavity between the inner hole of the sealing seat body (11) and the conveying screw shaft (4), an air sealing ring (13) being provided between the inner sealing packing (12) and the outer sealing packing (18), an air sealing ring groove (17) being provided on the inner wall of the air sealing ring (13), and the air sealing ring groove (17) being provided in the annular cavity between the inner hole of the sealing seat body (11) and the conveying screw shaft (4). 7) The air inlet hole (16) on the air seal ring wall is connected to the vent joint hole (15) on the seal seat body (11), and an elastic sealing wing ring (14) is embedded in the air seal ring groove (17). The elastic sealing wing ring (14) is located between one end of the air seal ring (13) that is in contact with the inner sealing packing (12) and the air inlet hole (16). At least one annular sealing wing (19) is provided on the inner wall of the elastic sealing wing ring (14). The inner edge of the annular sealing wing (19) is elastically in contact with the conveying spiral shaft (4) and is inclined toward the end where the inner sealing packing (12) is located.

2. The sealed, leak-free screw conveyor according to claim 1, characterized in that: Two inner sealing packings (12) and five outer sealing packings (18) are installed in the annular cavity between the inner hole of the sealing seat body (11) and the conveying spiral shaft (4).

3. The sealed, leak-free screw conveyor according to claim 1, characterized in that: A circumferential ring groove is provided on the outer periphery of the air sealing ring (13), 3-8 air inlet holes (16) are evenly distributed along the circumference on the air sealing ring wall in the circumferential ring groove, and a venting joint hole (15) is provided on the sealing seat body (11).

4. The sealed, leak-free screw conveyor according to claim 1, characterized in that: Two annular sealing wings (19) are provided on the inner wall of the elastic sealing wing ring (14).

5. The sealed, leak-free screw conveyor according to claim 1 or 4, characterized in that: The elastic sealing wing ring (14) is a wear-resistant rubber product.

6. The sealed, leak-free screw conveyor according to claim 1, characterized in that: An outer elastic sealing wing ring (20) is also embedded in the air-sealing ring groove (17). The outer elastic sealing wing ring (20) is located between one end of the outer sealing packing (18) and the air inlet (16) on the air-sealing ring (13). At least one annular sealing wing (19) is provided on the inner wall of the outer elastic sealing wing ring (20). The inner edge of the annular sealing wing (19) is elastically fitted with the conveying spiral shaft (4) and is inclined toward the end where the inner sealing packing (12) is located.

7. The sealed, leak-free screw conveyor according to claim 6, characterized in that: An annular sealing wing (19) is provided on the inner wall of the outer elastic sealing wing ring (20).

8. The sealed, leak-free screw conveyor according to claim 6 or 7, characterized in that: The outer elastic sealing wing ring (20) is made of wear-resistant rubber.

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