Durable discharge valve with sealing device

Abstract

The invention belongs to the field of powdery or granular material conveying, and particularly relates to a durable discharge valve with a sealing device, which comprises a motor and a valve body, the output end of the motor is connected with an impeller assembly, the impeller assembly is arranged in the inner cavity of the valve body, and the top and bottom openings of the valve body are respectively and fixedly provided with a connecting flange; the impeller assembly comprises a transmission shaft, rotors and blades, the transmission shaft is fixedly connected with the output end of the motor, the rotors are fixedly connected to the two sides of the outer wall of the transmission shaft, and cavities are formed in the ends of the two rotors. The labyrinth sealing device is arranged on the rotor and close to the material end, a labyrinth gap is formed through multiple barriers, a throttling effect is generated on sealed gas, meanwhile, under airtight assistance, the external pressure is larger than the internal pressure, leaked dust continues to enter the valve body, and therefore the good sealing effect is achieved; and a combined sealing mode of shaft static sealing, rotor labyrinth sealing and air tightness is adopted, so that the sealing effect is good, and the service life is long.

Description

Technical Field

[0001] The present invention relates to the field of conveying powdery or granular materials, and specifically to a durable discharge valve with a sealing device. Background Art

[0002] The star-shaped discharge valve drives the impeller to rotate through a motor, fills the materials above the valve body into the impeller, and discharges the materials quantitatively, continuously and evenly as the impeller rotates to the lower part of the valve body. It is widely used in powder (powder, granular materials and powder-particle mixtures) conveying systems for discharging, metering, dust removal, quantitative conveying, mixing, etc., and plays an important role in industries such as lithium battery, metallurgy, chemical industry, grain processing, and tobacco processing.

[0003] In the production line of lithium battery cathode materials, lithium battery raw materials have special properties such as strong abrasiveness, high viscosity, and strong hygroscopicity, which pose special requirements on the material, structure and sealing of the star-shaped discharge valve. Traditional star-shaped discharge valves have many defects, such as poor wear resistance of the tungsten carbide sprayed valve body, easy generation of static electricity and high cost of non-metallic valve bodies, and poor sealing effect resulting in material leakage. These problems seriously affect the service life and performance of the star-shaped discharge valve. Therefore, new technical solutions need to be designed to solve these problems. Summary of the Invention

[0004] The purpose of the present invention is to provide a durable discharge valve with a sealing device to solve the problems raised in the background art.

[0005] To achieve the above purpose, the present invention provides the following technical solution: A durable discharge valve with a sealing device, including a motor and a valve body. The output end of the motor is connected with an impeller assembly, the impeller assembly is installed in the inner cavity of the valve body, and connecting flanges are fixed at both the top and bottom openings of the valve body.

[0006] The impeller assembly includes a transmission shaft, a rotor and blades. The transmission shaft is fixedly connected to the output end of the motor. Cavities are opened at both ends of the outer wall of the transmission shaft. A plurality of evenly distributed blades are welded on the outer wall of the transmission shaft, and the blades are arranged between the two rotors. A labyrinth seal is sleeved on the outer wall of the rotor. A plurality of evenly distributed labyrinth straight channels are opened on the inner wall of the labyrinth seal, and grooves are opened on the outer wall of the labyrinth seal.

[0007] Both ends of the valve body are respectively fixedly connected with a left gland and a right gland through valve body flanges. A boss is fixedly connected to a side wall of the left gland close to the rotor. The boss is clamped in a groove. An air inlet is formed at an outer end of the left gland, and a trachea joint is installed in the air inlet. Installation grooves are formed in outer walls of the left gland and the right gland, and O-rings are installed in the installation grooves. A wind cavity is arranged in the left gland. The wind cavity is an annular wind cavity. A plurality of uniformly distributed air outlets facing the rotor are arranged in an inner cavity of the annular wind cavity. Outer walls of two ends of the rotating shaft are respectively connected with inner walls of the left gland and the right gland through bearings. A cover is detachably and fixedly connected to an outer end of the right gland through a fastener.

[0008] By adopting the above technical scheme, a conductive ceramic material such as zirconia is cladded on the surface of the rotor to prevent static electricity accumulation and achieve the explosion-proof function for dust transportation. The labyrinth seal adopts a modified PTEF material, and glass fiber, carbon fiber, graphite, etc. are added to increase the material hardness, wear resistance, reduce the friction coefficient, and improve the mechanical strength.

[0009] As a preferred embodiment of the present invention, a skeleton seal is installed on inner walls of the left gland and the right gland close to the rotor. Exhaust holes are formed in outer walls of the left gland and the right gland, and the exhaust holes are located between the skeleton seal and the bearing. A muffler is installed in the exhaust holes.

[0010] By adopting the above technical scheme, it is used to reduce the airflow noise and exhaust gas.

[0011] As a preferred embodiment of the present invention, a clearance of 0.2-0.5 mm is reserved between the labyrinth seal and the rotor on one side, and the clearance between the valve body and the impeller assembly on one side is ≤0.12 mm.

[0012] By adopting the above technical scheme, the labyrinth seal is arranged on the rotor near the material end. Through multiple obstacles, a labyrinth-like clearance is formed to generate a throttling effect on the sealed gas. At the same time, under the assistance of airtightness, when the external pressure is greater than the internal pressure, the leaked dust continues to enter the valve body, thus playing a good sealing role; the clearance between the labyrinth seal and the rotor on one side is ≤0.10 mm, and the non-contact labyrinth seal structure avoids the rotor from being worn, and the service life of the equipment is long; the clearance between the valve body and the impeller on one side is ≤0.12 mm, breaking through the conventional clearance, and the conventional unilateral clearance ≥0.25 mm, and the sealing effect is good.

[0013] As a preferred embodiment of the present invention, an inclined chamfer is formed on an end face of the blade.

[0014] By adopting the above technical scheme, it guides the material to flow along a specific direction and prevents the material from being blocked.

[0015] Compared with the prior art, the beneficial effects of the present invention are as follows:

[0016] A labyrinth seal is set on the rotor, near the material end. A labyrinth - type gap is formed through multiple obstacles, which produces a throttling effect on the sealed gas. Meanwhile, with the assistance of airtightness, when the external pressure is greater than the internal pressure, the leaking dust continues to enter the valve body, thus playing a good sealing role. The unilateral gap between the labyrinth seal and the rotor is ≤0.10 mm. The non - contact labyrinth seal structure avoids wear of the rotor, and the equipment has a long service life. The unilateral gap between the valve body and the impeller is ≤0.12 mm (breaking through the conventional gap, the conventional unilateral gap ≥0.25 mm), and the sealing effect is good.

[0017] The gland is provided with air inlet holes, air cavities, air inlets, etc., to ensure good air flow organization and achieve an airtight effect. A muffler is set, which can not only reduce the air flow noise, but also exhaust air and prevent external dust from entering.

[0018] A boss is set on the end face of the gland, and a groove is set for the labyrinth seal to prevent the labyrinth seal from rotating, ensure the gap with the rotor, facilitate the airtight assistance effect, and at the same time reduce the friction with the rotor, extending the service life of the equipment.

[0019] A groove is set on the gland shaft, and an O - ring is installed to form a static seal with the valve body to prevent dust leakage.

[0020] Adopt a combined sealing method of "shaft static seal + rotor labyrinth seal + airtightness", with good sealing effect and long service life.

[0021] On the rotor of the blade rotor, conductive ceramic materials such as zirconia are cladded to prevent static electricity accumulation and have an explosion - proof function. Both ends of the rotor are cavities to prevent material accumulation on the main shaft, prevent the main shaft from being ground, and extend the life of the main shaft.

[0022] The gland is both a bearing seat and a gland. It is installed in a limited way through the groove and the boss of the valve body. The structure is compact, the maintenance is simple, it ensures extremely high coaxiality, is convenient for installation, and has a long service life.

[0023] The blade end plate adopts a structure of large inclined chamfer or large inclined angle scraper to guide the material to flow along a specific direction and prevent material blockage. BRIEF DESCRIPTION OF THE DRAWINGS

[0024] By reading the following detailed description of the non - restrictive embodiments with reference to the accompanying drawings, other features, purposes and advantages of the present invention will become more obvious:

[0025] Figure 1 It is a schematic diagram of the overall structure of a durable discharging valve with a sealing device according to the present invention;

[0026] Figure 2 It is a schematic diagram of the blade structure of a durable discharging valve with a sealing device according to the present invention;

[0027] Figure 3Schematic diagram of the labyrinth seal structure of a durable discharge valve with a sealing device according to the present invention;

[0028] Figure 4 Enlarged schematic diagram of A of a durable discharge valve with a sealing device according to the present invention;

[0029] Figure 5 Schematic diagram of the connection structure between the blade and the rotor of a durable discharge valve with a sealing device according to the present invention;

[0030] Figure 6 Schematic diagram of a single blade structure of a durable discharge valve with a sealing device according to the present invention.

[0031] In the figure:

[0032] 1. Motor; 2. Air pipe joint; 3. Left gland; 4. Labyrinth seal; 5. Valve body; 6. Blade; 7. Connecting flange; 8. Right gland; 9. Muffler; 10. Sealing cover; 11. Fastener; 12. Skeleton seal; 13. Valve body flange; 14. Rotor; 15. O-ring; 16. Transmission shaft; 17. Bearing; 301. Boss; 401. Groove; 402. Labyrinth straight type; 601. Air cavity; 602. Air outlet; 701. Cavity. Detailed implementation manners

[0034] Next, the technical solutions in the embodiments of the present invention will be clearly and completely described in conjunction with the accompanying drawings in the embodiments of the present invention. Obviously, the described embodiments are only a part of the embodiments of the present invention, rather than all the embodiments.

[0035] In the description of the present invention, it should be understood that the orientation or positional relationships indicated by the terms "upper", "lower", "front", "rear", "left", "right", "top", "bottom", "inner", "outer", etc. are based on the orientation or positional relationships shown in the accompanying drawings, and are only for the convenience of describing the present invention and simplifying the description, rather than indicating or implying that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and therefore should not be construed as a limitation to the present invention.

[0036] In the description of the present invention, it should be noted that unless otherwise clearly specified and defined, the terms "installed", "connected", and "set" should be understood in a broad sense. For example, it can be fixedly connected and set, or detachably connected and set, or integrally connected and set. For those of ordinary skill in the art, the specific meanings of the above terms in the present invention can be understood according to specific situations. The models of the electrical appliances provided in the present invention are only for reference, and different models of electrical appliances with the same function can be replaced according to actual usage situations.

[0037] Please refer to Figure 1-6, the present invention provides a technical solution: a durable discharge valve with a sealing device, which includes a motor 1 and a valve body 5. The output end of the motor 1 is connected with an impeller assembly, and the impeller assembly is installed in the inner cavity of the valve body 5. Connecting flanges 7 are fixedly installed at both the top and bottom openings of the valve body 5;

[0038] The impeller assembly includes a transmission shaft 16, a rotor 14 and blades 6. The transmission shaft 16 is fixedly connected to the output end of the motor 1. Both sides of the outer wall of the transmission shaft 16 are fixedly connected with rotors 14. Cavities 701 are opened at the ends of the two rotors 14. A plurality of evenly distributed blades 6 are welded to the outer wall of the transmission shaft 16, and the blades 6 are arranged between the two rotors 14. A labyrinth seal 4 is sleeved on the outer wall of the rotor 14. A plurality of evenly distributed labyrinth straight channels 402 are opened on the inner wall of the labyrinth seal 4, and a groove 401 is opened on the outer wall of the labyrinth seal 4;

[0039] Both ends of the valve body 5 are respectively fixedly connected with a left gland 3 and a right gland 8 through valve body flanges 13. A boss 301 is fixedly connected to one side wall of the left gland 3 close to the rotor 14. The boss 301 is clamped in the groove 401. The boss 301 fits with the groove 401 of the labyrinth seal 4. The gland is fixed on the valve body 5 through a fastener 11 to prevent the labyrinth seal 4 from rotating. An air inlet is opened at the outer end of the left gland 3, and an air pipe joint 2 is installed in the air inlet. Installation grooves are opened on the outer walls of both the left gland 3 and the right gland 8, and O-rings 15 are installed in the installation grooves to form a static seal with the valve body 5. An air cavity 601 is arranged in the left gland 3. The air cavity 601 is an annular air cavity. A plurality of evenly distributed air outlets 602 facing the rotor 14 are arranged in the inner cavity of the annular air cavity 601. Both ends of the outer wall of the transmission shaft 16 are respectively connected with the inner walls of the left gland 3 and the right gland 8 through bearings 17. The outer end of the right gland 8 is detachably fixedly connected with a cover 10 through a fastener 11;

[0040] Skeleton seals 12 are installed on the inner walls of the left gland 3 and the right gland 8 close to the rotor 14. Exhaust holes are opened on the outer walls of both the left gland 3 and the right gland 8, and the exhaust holes are located between the skeleton seal 12 and the bearing 17. A muffler 9 is installed in the exhaust holes to reduce air flow noise and exhaust.

[0041] Among them, the surface of the rotor 14 is clad with a conductive ceramic material such as zirconia to prevent static electricity accumulation and has an explosion-proof function for dust transportation. The labyrinth seal 4 is made of modified PTEF material, and glass fiber, carbon fiber, graphite, etc. are added to increase the material hardness, wear resistance, reduce the friction coefficient, and improve the mechanical strength;

[0042] Furthermore, a unilateral clearance of 0.2 - 0.5 mm is reserved between the labyrinth seal 4 and the rotor 14, and the unilateral clearance between the valve body 5 and the impeller assembly is ≤ 0.12 mm;

[0043] It should be understood that the labyrinth seal 4 is arranged on the rotor 14, near the material end. A labyrinth-type gap is formed through multiple obstacles, which generates a throttling effect on the sealed gas. At the same time, with the assistance of airtightness, the external pressure is greater than the internal pressure, and the leaking dust continues to enter the valve body 5, thus playing a good sealing role; the unilateral gap between the labyrinth seal 4 and the rotor 14 is ≤0.10 mm. The non-contact labyrinth seal 4 structure avoids the wear of the rotor 14, and the equipment has a long service life; the unilateral gap between the valve body and the impeller is ≤0.12 mm, breaking through the conventional gap. The conventional unilateral gap is ≥0.25 mm, and the sealing effect is good.

[0044] Furthermore, the end face of the blade 6 is provided with an inclined chamfer to guide the material to flow along a specific direction and prevent the material from being blocked.

[0045] The implementation principle of a durable discharge valve with a sealing device in this application is as follows: First, an O-ring is used to form a static seal. Then, a labyrinth seal is arranged on the rotor, near the material end. A labyrinth-type gap is formed through multiple obstacles, which generates a throttling effect on the sealed gas. At the same time, with the assistance of airtightness, the external pressure is greater than the internal pressure, and the leaking dust continues to enter the valve body, thus playing a good sealing role. And the gland is provided with an air inlet hole, an air cavity, an air inlet, etc., to ensure good air flow organization and achieve an airtight effect. A muffler is provided, which can not only reduce the air flow noise but also exhaust air and prevent external dust from entering. Thus, a combined sealing method of "shaft static seal + rotor labyrinth seal + airtightness" is realized, with good sealing effect and long service life.

[0046] In addition, all the components included in a durable discharge valve with a sealing device according to the present invention are common standard parts or parts known to those skilled in the art. Its structure and principle can be known by those skilled in the art through technical manuals or through conventional experimental methods. At the idle place of this device, all the above-mentioned electrical components, which refer to power elements, electrical components, and the adapted monitoring computer and power supply, are connected through wires. For the specific connection means, reference should be made to the following working principle, and the electrical connection should be completed according to the sequential working order among the electrical components. The detailed connection means are well-known techniques in the art. The following mainly introduces the working principle and process, and will not explain the electrical control.

[0047] The foregoing has shown and described the basic principles, main features and advantages of the present invention. For a person skilled in the art, it is obvious that the present invention is not limited to the details of the above-described exemplary embodiments, and without departing from the spirit or basic features of the present invention, the present invention can be implemented in other specific forms. Therefore, in any regard, the embodiments should be regarded as exemplary and non-limiting. The scope of the present invention is defined by the appended claims rather than the above description. Therefore, all changes falling within the meaning and scope of the equivalent elements of the claims are intended to be embraced within the present invention. Any reference signs in the claims should not be construed as limiting the claims concerned.

[0048] In addition, it should be understood that although this specification is described in terms of embodiments, not every embodiment only contains an independent technical solution. This narrative manner of the specification is only for clarity. A person skilled in the art should regard the specification as a whole, and the technical solutions in each embodiment can also be appropriately combined to form other embodiments that can be understood by a person skilled in the art.

Claims

1. A durable discharge valve with a sealing device, comprising a motor (1) and a valve body (5), characterized in that: The output end of the motor (1) is connected to an impeller assembly, the impeller assembly is installed in the inner cavity of the valve body (5), and the top and bottom openings of the valve body (5) are both fixed with connecting flanges (7); The impeller assembly comprises a transmission shaft (16), a rotor (14) and blades (6); the transmission shaft (16) is fixedly connected to the output end of the motor (1); the rotors (14) are fixedly connected to both sides of the outer wall of the transmission shaft (16); the ends of the two rotors (14) are provided with cavities (701); a plurality of evenly distributed blades (6) are welded to the outer wall of the transmission shaft (16), and the blades (6) are arranged between the two rotors (14); the outer wall of the rotor (14) is provided with a labyrinth seal (4); the inner wall of the labyrinth seal (4) is provided with a plurality of evenly distributed labyrinth straight shapes (402); and the outer wall of the labyrinth seal (4) is provided with a groove (401); Both ends of the valve body (5) are respectively fixedly connected to a left gland (3) and a right gland (8) through a valve body flange (13); a side wall of the left gland (3) close to the rotor (14) is fixedly connected to a boss (301); the boss (301) is snap-fitted into the groove (401); an air inlet is provided at the outer end of the left gland (3), and an air pipe joint (2) is installed in the air inlet; the outer walls of the left gland (3) and the right gland (8) are both provided with mounting grooves, and the mounting grooves are provided with a gas pipe joint (2) in the gas pipe joint (2). An O-ring (15) is installed, and an air cavity (601) is arranged inside the left pressure cover (3), and the air cavity (601) is an annular air cavity. The inner cavity of the annular air cavity (601) is provided with a plurality of air outlets (602) evenly distributed and facing the rotor (14). The outer walls at both ends of the rotating shaft (16) are respectively connected to the inner walls of the left pressure cover (3) and the right pressure cover (8) through bearings (17), and the outer end of the right pressure cover (8) is detachably fixedly connected to the cover (10) through a fastener (11).

2. A durable discharge valve with a sealing device according to claim 1, characterized in that: The inner walls of the left gland (3) and the right gland (8) are provided with a skeleton seal (12) near the rotor (14), and the outer walls of the left gland (3) and the right gland (8) are provided with an exhaust hole, and the exhaust hole is located between the skeleton seal (12) and the bearing (17), and a muffler (9) is installed in the exhaust hole.

3. A durable discharge valve with a sealing device according to claim 1, characterized in that: The labyrinth seal (4) and the rotor (14) have a single-side reserved gap of 0.2-0.5 mm.

4. A durable discharge valve with a sealing device according to claim 1, characterized in that: The single-side clearance between the valve body (5) and the impeller assembly is ≤0.12 mm.

5. A durable discharge valve with a sealing device according to claim 1, characterized in that: The end surface of the blade (6) is provided with an inclined chamfer.

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