CN212745040U - Sealing structure applied to fine powder production equipment - Google Patents

Abstract

The utility model discloses a sealing structure applied to fine powder production equipment, which comprises a shell, a rotary sealing element and a first axial sealing element; the shell is fixed with a shell of the equipment, and the rotary sealing element and the first axial sealing element synchronously rotate along with the rotating shaft; a sealed chamber is left between the radially inner surface of the housing and the rotating shaft of the device. The rotary seal and first axial seal axially divide the seal cavity into three regions: an inner communication zone, a venting zone and an outer communication zone; the shell is also provided with a drain hole which is communicated with the discharging area and the area where the fine powder is located, and an air inlet pipeline which is communicated with the outside and the discharging area. Under the effect of low pressure gas, leak inside the fine powder body of drainage district can be blown back to equipment rapidly to avoid fine powder body to pile up between the contact surface of sealing member and rotation axis, avoid wearing and tearing phenomenon's emergence, improve sealed effect and seal structure's life greatly.

Description

Sealing structure applied to fine powder production equipment

Technical Field

The utility model relates to an equipment seal technical field especially relates to a be applied to seal structure of farine production facility.

Background

The fine powder is the particle diameter D of the powder₅₀Materials which are smaller than millimeter level and even can reach nanometer level need to be transported between devices in a state of fine powder in some special fields, for example, the transportation of lithium battery anode materials, the sealing of the materials in the transportation process is particularly important, the sealing structure in the prior art has good application to the sealing of gas and liquid and plays a good sealing role, and people also habitually use the sealing structures to operate and seal the powder materials, but the received effect is not ideal and the service life is short.

The commonly used sealing structure mainly comprises a packing seal and a labyrinth seal, wherein the packing seal is structurally shown in figure 1, a pressing piece is used for pressing the sealing piece irregularly in the using process to enable the sealing piece to be firmly and fixedly fastened on a rotating shaft, so that the sealing effect is achieved, obviously, for liquid and gas, the packing seal can achieve a good sealing effect, the labyrinth seal is structurally shown in figure 2, the labyrinth seal can achieve a certain effect on the sealing of powder with coarse particles, and the particles can be deposited in the labyrinth after entering the labyrinth for a main reason, so that the particle seepage time is prolonged, and a certain sealing effect is achieved.

However, for fine powder, it is difficult to achieve a long-term sealing effect by using the two sealing structures, because when particles of the fine powder are embedded between the sealing element and the rotating shaft, the sealing element and the rotating shaft are abraded, and along with continuous operation, the abrasion is larger and larger, the entering particles are more and more, and the abrasion is larger and larger. When the packing is used for sealing materials, the materials lose the effect and generate leakage after only running for one week.

In summary, how to design a sealing structure applied to a fine powder production device is a technical problem to be solved at present.

SUMMERY OF THE UTILITY MODEL

In order to solve the seal structure among the prior art and can not reach fine sealed effect in the fine powder field, fine powder piles up easily between sealing member and rotation axis, causes to produce wearing and tearing between sealing member and the rotation axis, leads to leaking serious technical problem, the utility model provides a be applied to fine powder production facility's seal structure and solve above-mentioned problem.

The utility model provides a technical scheme that its technical problem adopted is: a sealing structure applied to fine powder production equipment comprises a shell, a rotary sealing piece and a first axial sealing piece, wherein the shell is suitable for a rotary shaft of the equipment to penetrate through in the axial direction; the housing is fixed with a shell of the equipment, and the rotary sealing element and the first axial sealing element rotate synchronously with the rotating shaft; one end of the shell seals the fine powder body in the device; a sealed chamber is left between the radially inner surface of the housing and the rotating shaft of the device.

The rotary seal and the first axial seal are axially disposed within the seal cavity and axially divide the seal cavity into three regions: an internal communication zone, a drainage zone and an external communication zone, wherein the internal communication zone is communicated with the area where the fine powder is located; the shell is also provided with a drain hole which is communicated with the discharging area and the area where the fine powder is located, and an air inlet pipeline which is communicated with the outside and the discharging area.

Preferably, the rotary seal is disposed adjacent to one side of the fine powder body.

The rotary sealing element is positioned at one axial end of the shaft sleeve, the first axial sealing element is positioned at the circumferential outer side of the shaft sleeve, and the pressing element presses the other axial end of the shaft sleeve, so that the shell, the rotary sealing element and the shaft sleeve are axially pressed.

Preferably, the pressing piece comprises a jacking section and an end face section which are axially connected, the jacking section jacks the shaft sleeve, and the end face section is fixed with one end, far away from the fine powder, of the shell.

Further, the shell is provided with a boss extending radially inwards, and the sealing cavity is located on one side of the boss axially far away from the fine powder body.

Preferably, one end of the rotary sealing element, which is close to the boss, is a lip structure which is turned over radially outwards, and an axial end of the lip structure abuts against an axial end face of the boss.

Further, a second axial sealing element rotating along with the rotating shaft is arranged in the sealing cavity, the second axial sealing element is located on the circumferential outer side of the shaft sleeve, and the second axial sealing element is located between the first axial sealing element and the pressing element in the axial direction; the second axial seal axially divides the outer communication zone into two regions.

Preferably, the air inlet duct further has an air inlet branch pipe communicating with the seal cavity between the first and second axial seals.

Preferably, the shell, the rotary sealing element, the first axial sealing element, the shaft sleeve and the pressing element are all made of non-metal materials.

The utility model has the advantages that:

(1) be applied to fine powder production facility's seal structure, adopt rotary seal spare and first axial seal spare will sealed chamber is for three region along the axial separation, set up simultaneously and be located drainage hole and the admission line of middle drainage district intercommunication, under the effect of low pressure gas, leak to inside fine powder body in drainage district can be blown back equipment rapidly to avoid fine powder to pile up between the contact surface of sealing member and rotation axis, avoid wearing and tearing phenomenon's emergence, improve sealed effect and seal structure's life greatly.

(2) The utility model discloses in, the axial outside of rotation axis is fixed with the axle sleeve, the axle sleeve is as the intermediate junction spare of a plurality of sealing members, under the condition of mutual interval between the sealing member, with compress tightly the axial that the cooperation realized between the spare part and compress tightly to improve the axial seal effect of rotary seal spare and rotation axis.

(3) The utility model discloses in, the casing has the boss of radial inward extension, be close to on the rotary seal spare the one end of boss is the lip structure of radially outwards rolling over, the axial tip of lip structure supports on the axial terminal surface of boss, the design of lip structure can be with the powder of leaking to the guide of drainage district to avoid the powder to pile up in inside intercommunication district, reduced the wearing and tearing between rotary seal spare and the rotation axis.

Drawings

The present invention will be further explained with reference to the drawings and examples.

FIG. 1 is a schematic diagram of a prior art packing seal;

FIG. 2 is a schematic view of a prior art labyrinth seal;

FIG. 3 is a schematic structural view of a sealing structure of a fine powder production apparatus according to an embodiment of the present invention;

FIG. 4 is a schematic structural view of a sealing structure of a fine powder production apparatus according to an embodiment of the present invention;

fig. 5 is a schematic structural diagram of a specific embodiment of the sealing structure applied to the fine powder production equipment of the present invention.

In the figure, 1, a rotating shaft, 2, fine powder, 3, a shell, 301, a boss, 4, a rotating sealing element, 5, a first axial sealing element, 6, a second axial sealing element, 7, a pressing element, 701, a jacking section, 702, an end face section, 8, a shaft sleeve, 9, a sealing cavity, 901, an internal communication area, 902, a discharging area, 903, an external communication area, 10, a drainage hole, 11, a material, 12, an air inlet pipeline, 1201, an air inlet branch pipe, 13 and a sealing element.

Detailed Description

Reference will now be made in detail to embodiments of the present invention, examples of which are illustrated in the accompanying drawings, wherein like reference numerals refer to the same or similar elements or elements having the same or similar function throughout. The embodiments described below with reference to the drawings are exemplary only for the purpose of explaining the present invention, and should not be construed as limiting the present invention.

In the description of the present invention, it is to be understood that the terms "central", "inner", "outer", "axial", "radial", "circumferential", and the like, indicate orientations and positional relationships based on those shown in the drawings, and are used only for convenience in describing the present invention and for simplicity in description, and do not indicate or imply that the referenced device or element must have a particular orientation, be constructed and operated in a particular orientation, and thus, are not to be construed as limiting the present invention.

Furthermore, the terms "first," "second," and the like are used for descriptive purposes only and are not to be construed as indicating or implying relative importance.

As shown in fig. 3 to 5, a sealing structure applied to a fine powder 2 production apparatus includes a housing 3 adapted to pass a rotary shaft 1 of the apparatus in an axial direction, a rotary seal 4, and a first axial seal 5; the shell 3 is fixed with the shell of the equipment, and the rotary sealing element 4 and the first axial sealing element 5 synchronously rotate along with the rotating shaft 1; one end of the shell 3 seals the fine powder 2 in the device; a sealed chamber 9 remains between the radially inner surface of the housing 3 and the rotating shaft 1 of the device.

The rotary seal 4 and the first axial seal 5 are arranged axially within the seal chamber 9 and divide the seal chamber 9 axially into three regions: an internal communication zone 901, a purge zone 902 and an external communication zone 903, the internal communication zone 901 communicating with the zone where the fine powder 2 is located; the casing 3 is also provided with a drain hole 10 communicating the exhaust region 902 with the region where the fine powder 2 is located, and an intake duct 12 communicating the outside with the exhaust region 902.

The housing 3 serves as a protective shell of the sealing structure, and the housing 3 and the rotating shaft 1 are respectively extruded on the radial outer side and the radial inner side of the sealing element, so that the sealing element has a sealing function, the housing 3 and the rotating shaft 1 rotate relatively, so that the fine powder 2 can leak into the sealing cavity 9 from an axial gap between the housing 3 and the rotating shaft 1, and the rotary sealing element 4 and the first axial sealing element 5 rotate synchronously with the rotating shaft 1, so that circumferential relative motion also exists between the rotary sealing element 4, the first axial sealing element 5 and the housing 3, and the fine powder 2 can leak to the drainage area 902 from the inner communication area 901 through the axial gaps between the rotary sealing element 4 and the housing 3 and then leak to the outer communication area 903 through the axial gaps between the first axial sealing element 5 and the housing 3.

When the device works, an external air source supplies low-pressure gas into the air inlet pipe 12 all the time, the low-pressure gas enters the discharging area 902 from the air inlet pipe 12, when the fine powder 2 diffuses to the discharging area 902 after leaking, the fine powder 2 is blown to the drain hole 10 under the pushing of the low-pressure gas, and then enters the inside of the device again, through the cleaning process of the low-pressure gas, the fine powder 2 in the discharging area 902 can be removed in time, so that the fine powder 2 in the internal communication area 901 can enter the discharging area 902 again, and the fine powder 2 is prevented from being accumulated in the internal communication area 901. In addition, the internal communication area 901 is in communication with the area where the fine powder 2 is located inside the apparatus, and the internal communication area 901 provides a holding space for the fine powder 2, so that the fine powder 2 can be more easily diffused to the discharging area 902.

When the fine powder 2 enters the sealing cavity 9, the rotary sealing element 4 firstly blocks the fine powder 2, and the fine powder 2 entering the sealing cavity 9 is blown out of the drain hole 10 by the low-pressure gas introduced into the sealing cavity 9, so that less fine powder 2 enters the sealing position of the rotary sealing element 4 (namely the contact surface of the rotary sealing element 4 and the rotating shaft 1), and good sealing performance for a long time is ensured. It can be seen that the structure ensures good sealing performance for a long time, the introduction of low-pressure gas is critical, gas supply cannot be stopped in the operation process, meanwhile, the gas pressure is properly adjusted, the gas pressure is too high, a large amount of gas cannot be allowed to rush into the fine powder 2, and the gas pressure is too low, so that the fine powder 2 is difficult to blow out. Once the air pressure is debugged and determined, the air pressure is locked. In actual use, such a seal structure is found to have less particles entering the interface of rotary seal 4 and rotating shaft 1 when maintained after one year of use where seal integrity is better.

Preferably, the radially inner surface of the casing 3 near one end of the fine powder 2 is brought into close contact with the rotary shaft 1, thereby reducing the leakage rate of the fine powder 2 into the internal communicating region 901.

Embodiment 1, a sealing structure applied to a fine powder 2 production apparatus, as shown in fig. 3, includes a housing 3 adapted to pass a rotary shaft 1 of the apparatus in an axial direction, a rotary seal 4, and a first axial seal 5; the shell 3 and the shell of the equipment are fixed by bolts or welding, and the rotary sealing element 4 and the first axial sealing element 5 synchronously rotate along with the rotating shaft 1; one end of the shell 3 seals the fine powder 2 in the device; a sealed chamber 9 remains between the radially inner surface of the housing 3 and the rotating shaft 1 of the device. Casing 3, rotary seal 4 and first axial seal 5 are the columnar structure, and the center all is provided with the shaft hole, and rotary seal 4 and first axial seal 5 pass through the key-type connection mode and are fixed with rotation axis 1 circumference, radially compress tightly at the circumferential surface of rotation axis 1 under the effect of casing 3 simultaneously.

The rotary sealing element 4 and the first axial sealing element 5 are arranged in the sealing cavity 9 along the axial direction, and the rotary sealing element 4 is arranged close to one side of the fine powder body 2; the rotary seal 4 and the first axial seal 5 divide the seal chamber 9 axially into three regions: an internal communication zone 901, a purge zone 902 and an external communication zone 903, the internal communication zone 901 communicating with the zone where the fine powder 2 is located; the casing 3 is also provided with a drain hole 10 communicating the exhaust region 902 with the region where the fine powder 2 is located, and an intake duct 12 communicating the outside with the exhaust region 902.

The shell 3 is provided with a boss 301 extending radially inwards, the sealing cavity 9 is positioned at one side of the boss 301 which is far away from the fine powder body 2 in the axial direction, the arrangement of the boss 301 enables the radial clearance between the radial inner surface of one end, close to the fine powder body 2, of the shell 3 and the rotating shaft 1 to be reduced, and the shell 3 is regular in structure and convenient to process. The rotary sealing element 4 and the first axial sealing element 5 are in contact with the circumferential surfaces of the shell 3 and the rotating shaft 1, so that the fine powder 2 can more easily circulate between the contact surfaces of the sealing element and the shell 3, and the fine powder 2 is further prevented from entering the contact surfaces of the sealing element and the rotating shaft 1.

When the fine powder 2 is used for producing a positive electrode material for a lithium battery, since a metal material cannot exist inside the lithium battery, the case 3, the rotary seal member 4, and the first axial seal member 5 are all made of a non-metal material.

The rotary seal 4 and the first axial seal 5 may be regular annular cylinders.

Embodiment 2, as shown in fig. 3, this embodiment modifies the rotary seal 4 in embodiment 1 from a regular annular cylinder into a lip structure that is turned radially outward near one end of the boss 301, and the axial end of the lip structure abuts against the axial end face of the boss 301. The lip structure is designed to enable the rotary sealing element 4 to be in end face contact with the shell 3, the contact surface of the end face contact is small, so that the space of the internal communication area 901 is reduced, the space of the discharging area 902 is increased, fine powder 2 can enter the discharging area 902 through the small contact surface, the residence time of the fine powder 2 in the internal communication area 901 is reduced, and the lip structure is folded outwards in the radial direction and has the function of guiding the fine powder 2 to the discharging area 902.

Embodiment 3, on the basis of embodiment 1 or embodiment 2, as shown in fig. 4, the seal structure further includes a sleeve 8 and a pressing member 7, the sleeve 8 is located on the circumferential outer side of the rotating shaft 1 and rotates synchronously with the rotating shaft 1, the rotary seal member 4 is located at one axial end of the sleeve 8, the first axial seal member 5 is located on the circumferential outer side of the sleeve 8, and the pressing member 7 presses against the other axial end of the sleeve 8, so that the housing 3, the rotary seal member 4, and the sleeve 8 are pressed axially. The sleeve 8 is a non-metal member that rotates in synchronization with the rotating shaft 1, and is tightly fitted to the rotating shaft 1 in order to protect the rotating shaft 1 from abrasion. The compressing part 7 can compress the rotary sealing part 4 axially, so that the rotary sealing part 4 is tightly attached to the rotating shaft 1, and the compressing part 7 can be fixed with the rotating shaft 1 or the shell 3.

Preferably, the pressing member 7 comprises a pressing section 701 and an end face section 702 which are axially connected, the pressing section 701 presses the shaft sleeve 8, and the end face section 702 is fixed with one end of the shell 3, which is far away from the fine powder 2.

Embodiment 4, on the basis of embodiment 3, as shown in fig. 5, a second axial seal member 6 rotating with the rotating shaft 1 is further provided in the seal cavity 9, the second axial seal member 6 is located on the circumferential outer side of the shaft sleeve 8, and the second axial seal member 6 is located between the first axial seal member 5 and the pressing member 7 in the axial direction; the second axial seal 6 divides the outer communication area 903 in two areas in the axial direction.

The second axial seal 6 has the same structure and material as the first axial seal 5, and has the effect of increasing the sealing surface, reducing the rate of leakage of the fine powder 2 to the outside, and improving the sealing effect.

Preferably, the inlet duct 12 further has an inlet branch 1201 communicating with the sealed chamber 9 between the first and second axial seals 5, 6, in which case low-pressure gas introduced into the inlet branch 1201 may blow the fine powder 2 between the first and second axial seals 5, 6 back to the exhaust zone 902. Compared with the embodiments 1 to 3, the embodiment has the advantages that the sealing grade is increased, the leakage probability of the fine powder 2 is lower, the fine powder 2 can be ensured not to leak in the processing period, and in the production field of lithium battery anode materials, the leakage of the fine powder 2 can cause environmental pollution, so that the guarantee of the fine powder 2 not to leak in the processing period is very important.

In this specification, the schematic representations of the terms are not necessarily referring to the same embodiment. Furthermore, the particular features, structures, materials, or characteristics described may be combined in any suitable manner in any one or more embodiments.

In light of the foregoing, it will be apparent to those skilled in the art from this disclosure that various changes and modifications can be made without departing from the spirit and scope of the invention. The technical scope of the present invention is not limited to the content of the specification, and must be determined according to the scope of the claims.

Claims (9)

1. The utility model provides a be applied to seal structure of fine powder production facility which characterized in that: comprises a housing (3) adapted to be penetrated axially by a rotating shaft (1) of the device, a rotary seal (4) and a first axial seal (5); the shell (3) is fixed with the shell of the equipment, and the rotary sealing element (4) and the first axial sealing element (5) synchronously rotate along with the rotating shaft (1);

one end of the shell (3) seals the fine powder (2) in the equipment; a sealing cavity (9) is reserved between the radial inner surface of the shell (3) and the rotating shaft (1) of the equipment;

the rotary seal (4) and the first axial seal (5) are arranged axially within the seal chamber (9) and divide the seal chamber (9) axially into three regions: an internal communication area (901), a discharge area (902) and an external communication area (903), wherein the internal communication area (901) is communicated with the area where the fine powder (2) is located;

the shell (3) is also provided with a drain hole (10) for communicating the discharging area (902) with the area where the fine powder body (2) is located, and an air inlet pipeline (12) for communicating the outside with the discharging area (902).

2. The sealing structure applied to fine powder production equipment according to claim 1, characterized in that: the rotary sealing element (4) is arranged close to one side of the fine powder body (2).

3. The sealing structure applied to fine powder production equipment according to claim 2, characterized in that: the novel rotary shaft is characterized by further comprising a shaft sleeve (8) and a pressing piece (7), wherein the shaft sleeve (8) is located on the outer side of the circumference of the rotary shaft (1) and rotates synchronously with the rotary shaft (1), the rotary sealing piece (4) is located at one axial end of the shaft sleeve (8), the first axial sealing piece (5) is located on the outer side of the circumference of the shaft sleeve (8), and the pressing piece (7) presses the other axial end of the shaft sleeve (8) so that the shell (3), the rotary sealing piece (4) and the shaft sleeve (8) are axially pressed.

4. A sealing structure applied to fine powder production equipment according to claim 3, characterized in that: the pressing piece (7) comprises a pressing section (701) and an end face section (702) which are axially connected, the pressing section (701) presses the shaft sleeve (8), and the end face section (702) is fixed with one end, far away from the fine powder body (2), of the shell (3).

5. The sealing structure applied to fine powder production equipment according to any one of claims 2 to 4, wherein: the shell (3) is provided with a boss (301) extending inwards in the radial direction, and the sealing cavity (9) is located on one side of the boss (301) far away from the fine powder body (2) in the axial direction.

6. The sealing structure applied to fine powder production equipment according to claim 5, characterized in that: the rotary sealing element (4) is close to a lip-shaped structure which is turned over outwards in the radial direction at one end of the boss (301), and the axial end part of the lip-shaped structure is abutted to the axial end face of the boss (301).

7. A sealing structure applied to fine powder production equipment according to claim 3, characterized in that: a second axial sealing element (6) rotating along with the rotating shaft (1) is further arranged in the sealing cavity (9), the second axial sealing element (6) is located on the circumferential outer side of the shaft sleeve (8), and the second axial sealing element (6) is located between the first axial sealing element (5) and the pressing element (7) in the axial direction; the second axial seal (6) axially divides the outer communication area (903) into two regions.

8. The sealing structure applied to fine powder production equipment according to claim 7, characterized in that: the inlet duct (12) also has an inlet branch (1201) communicating with the sealing chamber (9) between the first (5) and second (6) axial seals.

9. A sealing structure applied to fine powder production equipment according to claim 3, characterized in that: the shell (3), the rotary sealing element (4), the first axial sealing element (5), the shaft sleeve (8) and the pressing element (7) are all made of non-metal materials.

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