An airtight structure for the shaft end of a tubular screw conveyor

Abstract

This utility model discloses an airtight structure for the shaft end of a tubular screw conveyor, relating to the field of conveying equipment technology. The airtight structure includes an airtight structure system, three annular felt sealing rings, three skeleton lip sealing rings, a skeleton lip sealing ring pressure ring, a sealing device fixing ring, and a dust-blocking ring. The dust-blocking ring is located at the front end of the output shaft, and the sequence is: three annular felt sealing rings, three skeleton lip sealing rings, and a skeleton lip sealing ring pressure ring. The sealing device fixing ring is located on the outermost side, fixing all sealing components within the sealing cavity. This utility model, through the combination of multiple sealing structures and gas isolation between the sealing components and the output shaft, effectively improves the shaft end sealing effect of the conveyor, reduces output shaft wear, extends service life, and prevents dust or material leakage, thereby greatly improving the production line's operating rate.

Description

Technical Field

[0001] This utility model relates to the field of conveying equipment technology, specifically to an air-tight structure for the shaft end of a tubular screw conveyor. Background Technology

[0002] Tubular screw conveyors are machines that use a rotating screw to push the conveyed material along a fixed casing to complete the conveying work. They are suitable for conveying powder, granular, and small block materials and are widely used in many industries such as building materials, power, and chemicals.

[0003] Currently, shaft end seals in tubular screw conveyors mostly employ contact seals. These seals are primarily divided into two categories: skeleton lip seals and packing seals. Skeleton lip seals work by using a lip spring to apply pressure to the contact surface between the sealing lip and the shaft, causing the rubber lip to deform elastically and thus achieve a tight seal. However, the sealing lip is easily worn down by material entering the shaft, and frictional heat can even lead to carbonization, ultimately resulting in complete seal failure. Packing seals, on the other hand, involve placing packing material inside a packing cavity and pressing it against the shaft surface using a packing gland. The preload of the gland ensures a tight fit between the packing seal ring and the shaft, preventing media leakage. However, excessive preload not only reduces the elasticity of the packing but also accelerates wear on the packing or the drive shaft; insufficient preload easily leads to material leakage. Therefore, both types of seals are prone to seal failure and dust / material leakage during use. Utility Model Content

[0004] This invention provides an airtight structure for the shaft end of a tubular screw conveyor to solve the problems mentioned in the background art.

[0005] To achieve the above objectives, the technical solution provided by this utility model is as follows: an air-tight structure for the shaft end of a tubular screw conveyor, comprising: an air-tight structure system, three annular felt sealing rings, three skeleton lip sealing rings, a skeleton lip sealing ring pressure ring, a sealing device fixing ring, and a dust-blocking ring. The dust-blocking ring is located at the front end of the output shaft of the equipment, and consists of three annular felt sealing rings, three skeleton lip sealing rings, and a skeleton lip sealing ring pressure ring in sequence. The sealing device fixing ring is located on the outermost side and can fix all sealing components in the sealing cavity.

[0006] Preferably, the dust-blocking ring rotates with the shaft and has a 1 mm gap between it and the outer shell of the sealing body.

[0007] Preferably, the three felt sealing rings need to be pre-treated with oil immersion before installation to improve the density of the fibers and enhance the sealing performance, thereby avoiding high-temperature failure due to dry friction. The three annular felt sealing rings fit tightly together, and their inner holes fit tightly with the rotating shaft to achieve the purpose of primary sealing.

[0008] Preferably, all three skeleton lip seals are installed in the same direction, and all the sealing lips are located on the side of the felt seal.

[0009] Preferably, the gas-tight structure system includes a compressed gas controller, an annular air inlet, an O-ring seal for the air inlet, a main air inlet for the gas-tight structure, and an inflation chamber. The compressed gas controller is located outside the sealing structure and is connected to the sealing structure via a cable or air pipe.

[0010] Preferably, the compressed gas controller is interlocked with the motor: when the motor is energized, the controller starts immediately; when the motor is de-energized, the controller stops after a delay, which can realize the function of timely opening or cutting off the set pressure and set flow rate, and the function of transporting gas to the inflation chamber through the gas channel.

[0011] Preferably, the O-ring seal is used to seal the sealing end face of the annular groove air passage. The annular groove air passage is designed to facilitate the installation of the air inlet at any position on the housing, without being limited by the installation position or angle.

[0012] Preferably, the main air intake of the gas-tight structure is mainly used to introduce external gas into the inflation chamber through a dedicated air intake channel.

[0013] Preferably, the inflation chamber is located between the first skeleton lip seal ring and the second skeleton lip seal ring. Gas enters the inflation chamber through the annular air inlet and the main air inlet of the air-sealed structure. The inflation chamber is an annular sealed chamber, and a certain gap is reserved between the inner wall of the chamber and the central axis.

[0014] Compared with the prior art, the beneficial effects of this utility model are: This airtight structure for the shaft end of a tubular screw conveyor consists of a dust-blocking ring at the front end of the output shaft, three adjacent annular felt seals, three skeleton lip seals, an airtight structure system between the first and second skeleton lip seals, a skeleton lip seal pressure ring near the power drive side, and a sealing device fixing ring. Through a compressed gas controller, a certain amount of gas can be injected into the air chamber, maintaining a working condition inside the sealing structure that is greater than the material pressure. This suppresses material from entering the sealing structure, thus protecting the environment and the operating equipment such as the reducer or bearing assembly.

[0015] This air-sealing structure for the shaft end of a tubular screw conveyor allows gas in the inflation chamber to escape and be released only from the sealing lip on the output side. The gas is then discharged into the interior of the conveyor through three annular felt sealing rings, exerting positive pressure on the conveyed material and completely eliminating the risk of equipment damage or environmental pollution caused by material entering the sealing structure. Attached Figure Description

[0016] To more clearly illustrate the technical solutions in this utility model or the prior art, the drawings used in the description of the embodiments or the prior art will be briefly introduced below. Obviously, the drawings described below are some embodiments of this utility model. For those skilled in the art, other drawings can be obtained from these drawings without creative effort.

[0017] Figure 1 This is a schematic diagram of an air-tight structure for the shaft end of a tubular screw conveyor according to the present invention; Figure 2 This is an exploded view of the airtight structure system of this utility model; Figure 3 This is a schematic diagram of the airtight structure component of this utility model.

[0018] Reference numerals in the attached drawings: 1. Gas-tight structure system; 101. Compressed gas controller; 102. Annular air inlet; 103. O-ring seal for the air passage; 104. Main air inlet of the gas-tight structure; 105. Inflation chamber; 2. Three-ring felt seal; 3. Three-ribbed lip seal; 4. Ribbed lip seal pressure ring; 5. Sealing device retaining ring; 6. Dust-blocking ring. Detailed Implementation

[0019] To make the objectives, technical solutions, and advantages of this utility model clearer, the technical solutions of this utility model will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some, not all, of the embodiments of this utility model. All other embodiments obtained by those skilled in the art based on the embodiments of this utility model without creative effort are within the scope of protection of this utility model. The following embodiments are used to illustrate this utility model but should not be used to limit its scope.

[0020] In the description of the embodiments of this utility model, it should be noted that the terms "center", "longitudinal", "lateral", "up", "down", "front", "rear", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", and "outer" indicate the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings. They are only for the convenience of describing the embodiments of this utility model and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation. Therefore, they should not be construed as limitations on the embodiments of this utility model.

[0021] In the description of the embodiments of this utility model, it should be noted that, unless otherwise explicitly specified and limited, the terms "connected" or "linked" should be interpreted broadly, for example, they can refer to a fixed connection, a detachable connection, or an integral connection. Those skilled in the art can understand the specific meaning of the above terms in the embodiments of this utility model based on the specific circumstances.

[0022] like Figure 1 As shown, this utility model provides an airtight structure system 1, which is installed on the shaft end of a tubular screw conveyor.

[0023] like Figure 2 As shown, the gas-tight structure system 1 of this utility model includes: a compressed gas controller 101, an annular air inlet 102, an O-ring seal 103 for the air inlet, a main air inlet 104 for the gas-tight structure, and an inflation chamber 105. The compressed gas controller 101 is interlocked with the motor, which can deliver gas with a set pressure and a set flow rate to the inflation chamber 105 through the gas channel, so that the sealing structure always maintains a working condition greater than the material pressure, completely suppressing the material in the screw conveyor equipment from entering the sealing structure, thereby protecting the operating equipment such as the reducer or bearing device.

[0024] like Figure 3As shown, the gas-tight structure assembly of this utility model includes: three annular felt sealing rings 2, three skeleton lip sealing rings 3, a skeleton lip sealing ring pressure ring 4, a sealing device fixing ring 5, and a dust-blocking ring 6. The dust-blocking ring 6 is located at the front end of the equipment output shaft. The sequence is: three annular felt sealing rings 2, three skeleton lip sealing rings 3, and skeleton lip sealing ring pressure ring 4. The sealing device fixing ring 5 is located on the outermost side and can fix all sealing components in the sealing cavity. The three annular felt sealing rings 2 need to be pre-treated with oil before installation to improve the fiber density and enhance the sealing performance, thereby avoiding high-temperature failure due to dry friction. The three annular felt sealing rings fit tightly together, and their inner holes fit tightly with the rotating shaft to achieve the purpose of primary sealing. The three skeleton lip sealing rings 3 are all installed in the same direction, and the sealing lips are all located on the side of the felt sealing ring. An air-filled chamber is located between the first and second sealing rings. The first sealing ring serves to enhance sealing and lock in dust. When the felt sealing ring wears down or the preload decreases, the gas in the air-filled chamber will escape into the material through the space between the sealing lip and the rotating shaft. At the same time, when compressed gas stops entering the air-filled chamber, the first sealing lip will instantly lock the rotating shaft under the action of the spring, blocking some tiny dust particles from entering the air-filled chamber. The second and third sealing rings not only serve as a safety seal but also have an air-locking effect, ensuring that the gas in the air-filled chamber can only be discharged from one direction. The gap between the two sealing rings is completely filled with grease, reducing the friction between the sealing lip and the rotating shaft and extending the service life of the sealing lip.

[0025] Specifically, when the screw conveyor starts, the compressor controller 1, interlocked with the motor, starts. The dust-blocking ring 6 rotates with the shaft, with a 1 mm gap reserved between it and the outer shell of the sealing body. When compressed gas escapes from the sealing cavity, a high-pressure zone is formed in this area, reducing or preventing material flow to the junction of the rotating shaft and the sealing ring, extending the service life of the sealing material, and having a certain effect of saving compressed gas. The three-ring felt sealing ring 2 undergoes oil impregnation pretreatment before installation, which improves the fiber density, enhances the sealing performance, and avoids high-temperature failure due to dry friction. The three-ring felt sealing ring 2 fits tightly, and its inner hole fits tightly with the rotating shaft, achieving the purpose of primary sealing. The three-layer skeleton lip seal ring 3 has an air-filled chamber between the innermost first and second sealing rings. The first sealing ring enhances the seal and locks in ash, while the second and third sealing rings not only provide a secure seal but also lock in airflow, ensuring that the gas in the air-filled chamber can only be discharged from one direction. The gas in the air-filled chamber between the first and second lip seal rings is blocked by the second and third sealing lips, allowing the gas to pass only between the first sealing lip and the rotating shaft to enter the material, thus improving the fluidization effect of the material and ensuring the effective utilization rate of the gas.

[0026] Finally, it should be noted that the above embodiments are only used to illustrate the technical solutions of this utility model, and not to limit it. Although this utility model has been described in detail with reference to the foregoing embodiments, those skilled in the art should understand that modifications can still be made to the technical solutions described in the foregoing embodiments, or equivalent substitutions can be made to some of the technical features. Such modifications or substitutions do not cause the essence of the corresponding technical solutions to deviate from the spirit and scope of the technical solutions of the embodiments of this utility model.

Claims

1. An airtight structure for the shaft end of a tubular screw conveyor, comprising: an airtight structure system (1), three annular felt sealing rings (2), three skeleton lip sealing rings (3), a skeleton lip sealing ring pressure ring (4), a sealing device fixing ring (5), and a dust-blocking ring (6), characterized in that: The dust-blocking ring (6) is located at the front end of the output shaft of the equipment. It consists of three annular felt sealing rings (2), three skeleton lip sealing rings (3), and a skeleton lip sealing ring pressure ring (4). The sealing device fixing ring (5) is located on the outermost side, which can fix all sealing components in the sealing cavity.

2. The airtight structure for the shaft end of a tubular screw conveyor according to claim 1, characterized in that: The dust-blocking ring (6) rotates with the shaft and has a 1 mm gap between it and the outer shell of the sealing body.

3. The airtight structure for the shaft end of a tubular screw conveyor according to claim 1, characterized in that: The three annular felt sealing rings (2) need to be pre-treated with oil immersion before installation to improve the density of the fibers and enhance the sealing performance, thereby avoiding high temperature failure due to dry friction. The three annular felt sealing rings fit tightly together and their inner holes fit tightly with the rotating shaft to achieve the purpose of primary sealing.

4. The airtight structure for the shaft end of a tubular screw conveyor according to claim 1, characterized in that: The three skeleton lip seals (3) are all installed in the same direction, and the sealing lips are all located on the side of the felt seal.

5. The airtight structure for the shaft end of a tubular screw conveyor according to claim 1, characterized in that: The gas-tight structure system (1) includes a compressed gas controller (101), an annular air inlet (102), an air inlet O-ring (103), a main air inlet of the gas-tight structure (104), and an inflation chamber (105). The compressed gas controller (101) is located outside the sealing structure and is connected to the sealing structure via a cable or air pipe.

6. The airtight structure for the shaft end of a tubular screw conveyor according to claim 5, characterized in that: The compressed gas controller (101) is interlocked with the motor: when the motor is energized, the controller starts immediately; when the motor is de-energized, the controller stops after a delay, which can realize the function of timely opening or cutting off the set pressure and set flow rate. The gas is transported to the inflation chamber through the gas channel.

7. The airtight structure for the shaft end of a tubular screw conveyor according to claim 5, characterized in that: The O-ring (103) for the air passage is used to seal the sealing end face of the annular groove air passage. The annular groove air passage is designed to facilitate the installation of the air inlet at any position on the housing, without being limited by the installation position or angle.

8. The airtight structure for the shaft end of a tubular screw conveyor according to claim 5, characterized in that: The main air intake channel (104) of the gas-tight structure is mainly used to introduce external gas into the inflation chamber through a dedicated air intake channel.

9. The airtight structure for the shaft end of a tubular screw conveyor according to claim 5, characterized in that: The inflation chamber (105) is located between the first skeleton lip seal ring and the second skeleton lip seal ring. Gas enters the inflation chamber (105) through the annular air inlet (102) and the main air inlet (104) of the air-tight structure. The inflation chamber (105) is an annular sealed chamber with a certain gap reserved between the inner wall of the chamber and the central axis.

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