Dual-seal grading mechanism suitable for jet mill

Abstract

The utility model relates to a double seal grading mechanism suitable for jet mill, which comprises a motor, a grading wheel and a discharge port, the motor drives the grading wheel to rotate, the end part of the grading wheel and the end part of the discharge port are oppositely arranged, the end part of the grading wheel is provided with a seal boss, the end part of the discharge port is provided with a seal groove, and the seal boss is provided with a seal groove. A sealing boss at the end part of the grading wheel is nested in a sealing groove at the end part of the discharge hole to form a labyrinth sealing structure, and a labyrinth gap is formed between the sealing boss and the sealing groove; a plurality of air sealing holes are formed in the end of the discharging port in the circumferential direction at intervals, one end of each air sealing hole communicates with the sealing groove, and the other end of each air sealing hole communicates with a high-pressure air source. According to the utility model, a double-sealing structure of the mechanical labyrinth and the air seal is utilized, so that external dust can be effectively prevented from entering the mechanism when equipment runs.

Description

Technical Field

[0001] The utility model relates to the technical field of grading mechanisms, in particular to a double-sealed grading mechanism suitable for air flow mills. Background Art

[0002] The existing powder classifier only uses a single labyrinth seal structure between the classifying wheel and the discharge port. In production practice, it is found that coarse particles of powder still leak, making it difficult to apply to the classification of ultrafine powders. Summary of the Invention

[0003] The purpose of the utility model is to overcome the deficiencies of the prior art and provide a double-sealed grading mechanism suitable for an air jet mill.

[0004] In order to achieve the above purpose, the utility model adopts the following technical solutions:

[0005] A double-sealed grading mechanism suitable for an air flow mill includes a motor, a grading wheel and a discharge port. The motor drives the grading wheel to rotate. The end of the grading wheel is arranged opposite to the end of the discharge port. A sealing boss is provided at the end of the grading wheel, and a sealing groove is provided at the end of the discharge port. The sealing boss at the end of the grading wheel is nested in the sealing groove at the end of the discharge port to form a labyrinth sealing structure, and a labyrinth gap is provided between the sealing boss and the sealing groove. A plurality of airtight sealing holes are provided at intervals along the circumferential direction at the end of the discharge port, one end of the airtight sealing hole is connected to the sealing groove, and the other end of the airtight sealing hole is connected to a high-pressure air source.

[0006] Furthermore, the grading wheel is directly connected to the output shaft of the motor through the gland and fastening bolts thereon.

[0007] Furthermore, an air flow channel is provided inside the discharge port, one end of the air flow channel is connected to the other end of the airtight seal hole, and the other end of the air flow channel is connected to a high-pressure air source.

[0008] Furthermore, blade notches are distributed around the end surface of the classifying wheel at the labyrinth sealing structure.

[0009] The utility model adopts the above technical solution, which has the following beneficial effects:

[0010] 1. This utility model uses a double sealing structure of mechanical labyrinth and air seal, which can effectively prevent external dust from entering the interior of the mechanism when the equipment is running;

[0011] 2. The grading wheel is directly connected to the motor through the grading wheel cover and fastening bolts, which has the advantages of high transmission efficiency, easy maintenance and strong adaptability. BRIEF DESCRIPTION OF THE DRAWINGS

[0012] The present invention will be further described in detail below with reference to the accompanying drawings and specific embodiments:

[0013] Figure 1 It is a cross-sectional view of the utility model;

[0014] Figure 2 for Figure 1 Enlarged view of point C in the middle. DETAILED DESCRIPTION

[0015] like Figure 1-2 As shown, the utility model is a jet mill suitable for a double-sealed grading mechanism, including a motor 5, a grading wheel 1 and a discharge port 2. The motor 5 drives the grading wheel 1 to rotate, and the end of the grading wheel 1 is arranged opposite to the end of the discharge port 2. A sealing boss 11 is provided at the end of the grading wheel 1, and a sealing groove 21 is provided at the end of the discharge port 2. The sealing boss 11 at the end of the grading wheel 1 is nested in the sealing groove 21 at the end of the discharge port 2 to form a labyrinth sealing structure, and a labyrinth gap is provided between the sealing boss 11 and the sealing groove 21.

[0016] The end of the discharge port 2 is provided with a plurality of airtight sealing holes 22 spaced circumferentially. One end of each airtight sealing hole 22 is connected to the sealing groove 21, and the other end is connected to a high-pressure air source. Specifically, an airflow channel is provided within the discharge port 2, one end of which is connected to the other end of the airtight sealing hole 22, and the other end of which is connected to a high-pressure air source (pressure of 2-3 kg).

[0017] The grading wheel 1 is directly connected to the output shaft of the motor 5 through the gland 3 and the fastening bolts 4 thereon, and has the advantages of high transmission efficiency, easy maintenance, and strong adaptability.

[0018] The end face of the classifying wheel 1 is provided with blade notches around the periphery of the labyrinth seal structure. When the classifying wheel 1 rotates, the airflow at the end of the classifying wheel 1 undergoes centrifugal motion along with the blades, forming a pressure difference between the inside and outside. The airflow is then discharged to the outside through the labyrinth gap. The higher the speed, the more significant the pressure difference and the faster the airflow.

[0019] In the present invention, the labyrinth sealing structure and the airtight sealing hole 22 are on the same side, which makes the manufacturing process of the labyrinth sealing structure and the airtight sealing hole 22 relatively simple and facilitates equipment installation and maintenance.

[0020] The high-pressure gas passes through the airtight seal hole 22, the labyrinth gap 6 and the end surface of the classifying wheel 1 to make centrifugal motion and is discharged to the outside together with the air flow, thus preventing dust from entering the inner cavity.

[0021] The utility model utilizes a double sealing structure of a mechanical labyrinth and an air seal, which can effectively prevent external dust from entering the interior of the mechanism when the equipment is running.

[0022] The above describes the specific implementation of the present invention, but those skilled in the art should understand that this is only an example. Those skilled in the art can make various changes or modifications to this implementation without departing from the principle and essence of the present invention, but these changes and modifications will fall within the scope of protection of the present invention.

Claims

1. A jet mill with a double-sealed grading mechanism, comprising a motor, a grading wheel and a discharge port, wherein the motor drives the grading wheel to rotate, is characterized in that: The end of the grading wheel is arranged opposite to the end of the discharge port, a sealing boss is provided at the end of the grading wheel, and a sealing groove is provided at the end of the discharge port. The sealing boss at the end of the grading wheel is nested in the sealing groove at the end of the discharge port to form a labyrinth sealing structure, and a labyrinth gap is provided between the sealing boss and the sealing groove; the end of the discharge port is provided with a plurality of airtight sealing holes at intervals along the circumferential direction, one end of the airtight sealing hole is connected to the sealing groove, and the other end of the airtight sealing hole is connected to the high-pressure gas source.

2. The air jet mill according to claim 1 is suitable for a double-sealed grading mechanism, characterized in that: The grading wheel is directly connected to the output shaft of the motor through the gland and fastening bolts thereon.

3. The air jet mill according to claim 1 is suitable for a double-sealed grading mechanism, characterized in that: An air flow channel is provided inside the discharge port, one end of the air flow channel is connected to the other end of the airtight seal hole, and the other end of the air flow channel is connected to a high-pressure air source.

4. The air jet mill according to claim 1 is suitable for a double-sealed grading mechanism, characterized in that: The end surface of the classifying wheel is provided with blade slots distributed around the circumference of the labyrinth seal structure.

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