High-sealing pre-dehydration device

Abstract

This utility model discloses a highly airtight pre-dehydration device, including a pre-dehydration tank with a pre-dehydration water collection hopper at the bottom. A rotary dehydration device is installed within the pre-dehydration tank, comprising: a drum screen rotatably mounted within the pre-dehydration tank and having several screen holes; a rotating drum base coaxially fixed to the drum screen and extending beyond the feed end of the pre-dehydration tank; a fixed feed pipe coaxially located within the inner cavity of the rotating drum base, with its inlet end connected to the chute of the feed hopper and its outlet end connected to the inner cavity of the drum screen; an intermediate bearing seat fixed to the center of the end plate at the discharge end of the rotating drum base and supported at the discharge end of the fixed feed pipe via an intermediate bearing, with sealing rings on both sides of the intermediate bearing; and a packing seal structure located between the feed end of the fixed feed pipe and the rotating drum base. This device effectively prevents water leakage at the feed end.

Description

Technical Field

[0001] This utility model relates to a pre-dehydration device with high sealing performance, belonging to the technical field of extrusion equipment. Background Technology

[0002] Dewatering machines are widely used in various industries such as food, chemicals, and environmental protection. Their working principle is similar to manually squeezing water from a wet towel; they remove moisture from materials through a screw-type mechanical pressing method, thus achieving dehydration. Dewatering machines primarily separate the liquid from materials through screw extrusion, thereby achieving dehydration. They operate using physical pressing, requiring no external heat source, have a simple structure, and are suitable for a variety of materials. Therefore, dewatering materials before drying reduces energy consumption and drying costs, offering significant economic value.

[0003] Traditional dewatering machines are generally screw extruders, mainly composed of a frame, drive unit, feeding device, extrusion and dewatering device, and discharge device. Material is fed into the extrusion and dewatering section by the feeding device. The distance between the screw shaft and the outer casing of the extrusion and dewatering section is not uniform; the distance from the feeding section to the discharge end gradually decreases. Therefore, as the material advances under the action of the screw shaft in the extrusion and dewatering section, the pressure it experiences also continuously increases. The liquid in the material is squeezed out through the sieve openings of the outer casing, completing the initial dewatering.

[0004] In the starch industry, raw materials such as corn germ and epidermal fiber are initially dehydrated by a dehydrator before drying. Therefore, the dehydration rate of the dehydrator has a great influence on the energy consumption of the subsequent drying process. The higher the dehydration rate in the dehydration stage, the less energy is consumed in the drying stage, and the lower the drying cost.

[0005] Traditional extruders mainly use straight shaft + conical screen, conical shaft + straight screen, or multi-section variable diameter + variable spiral for extrusion and dewatering. None of these methods have an effective pre-dewatering function, resulting in high moisture content at the feed end and excessive leakage at the sealing end, thus leading to poor dewatering performance.

[0006] Chinese utility model patent CN 221349637U discloses a squeeze dryer, including a frame with a channel for materials to pass through; slides symmetrically arranged on both sides of the frame, the length direction of the slides being perpendicular to the direction of material movement; a squeeze roller assembly having two squeeze rollers oppositely arranged on both sides of the direction of material movement; sliding seats at both ends of the squeeze rollers cooperating with the slides; a drying assembly mounted on the frame and located on the discharge side of the squeeze roller assembly; and a roller gap measuring assembly for measuring the distance between the two squeeze rollers. This squeeze dryer avoids introducing moisture into subsequent processes by combining squeezing and drying. However, it requires a larger airflow device, necessitating the addition of a pneumatic cylinder, increasing the footprint and time consumption.

[0007] In the starch industry, traditional extruders primarily use gradually increasing pressure to squeeze out moisture from materials with high humidity. This results in much of the initially squeezed-out free water being trapped between the material particles, making it difficult to dry completely. Furthermore, it leads to inconsistent moisture content between the internal and external materials, with the internal material having a higher moisture content than the external material, which is detrimental to subsequent drying. The presence of a large amount of initially trapped free water at the feed end also makes front-end sealing difficult. Utility Model Content

[0008] The purpose of this section is to outline some aspects of embodiments of the present invention and to briefly describe some preferred embodiments. Simplifications or omissions may be made in this section, as well as in the abstract and title of this application, and such simplifications or omissions should not be construed as limiting the scope of the present invention.

[0009] In view of the problems existing in the above and / or prior art, this utility model is proposed.

[0010] The purpose of this invention is to overcome the problems existing in the prior art and provide a pre-dehydration device with high sealing performance, which integrates pre-dehydration and extrusion dehydration, is more in line with the material dehydration process, and produces materials with low and uniform moisture content and good sealing effect, thus effectively solving the problem of water leakage at the feed end.

[0011] To solve the above technical problems, this utility model provides a high-sealing pre-dehydration device, including a pre-dehydration tank, a pre-dehydration water collection hopper at the bottom of the pre-dehydration tank, and a rotary dehydration device inside the pre-dehydration tank, the rotary dehydration device comprising:

[0012] A drum screen is rotatably disposed within the pre-dehydration tank and has several screen holes;

[0013] A rotating drum seat is coaxially fixed with the drum screen and extends out of the feed end of the pre-dehydration tank;

[0014] A fixed feed pipe is coaxially located in the inner cavity of the rotating drum seat. Its inlet end is connected to the chute of the feed hopper, and its outlet end is connected to the inner cavity space of the drum screen.

[0015] An intermediate bearing seat is fixed to the center of the end plate at the discharge end of the rotating drum seat and supported at the discharge end of the fixed feed pipe by an intermediate bearing. Sealing rings are provided on both sides of the intermediate bearing.

[0016] The packing seal structure is located between the feed end of the fixed feed pipe and the rotating drum seat.

[0017] Furthermore, the inner cavity of the drum screen is coaxially provided with an extrusion rotor. The squeezing rotor shaft at the inlet end of the extrusion rotor passes through the fixed feed pipe. The inlet end of the fixed feed pipe is provided with a feed sealing seat. The central hole of the feed sealing seat is embedded with a feed sealing element to achieve rotational sealing with the squeezing rotor shaft.

[0018] Furthermore, the intermediate bearing housing is symmetrically provided with radially penetrating bearing housing drain ports at one end near the outlet of the fixed feed pipe. The bearing housing drain ports are connected to the outer peripheral space of the drum screen inside the pre-dehydration tank via drain pipes and drain connectors.

[0019] Furthermore, the outlet end of the drum screen is connected to an inner drum retaining ring, the outlet end of which is embedded in the groove of the extrusion inlet seat and forms a labyrinth seal, and the extrusion inlet seat is fixed to the discharge end side wall of the pre-dehydration box.

[0020] Furthermore, the outer edge of the outlet flange of the rotating drum seat is embedded in the central hole of the inlet side wall of the pre-dehydration tank and is sealed to each other by a skeleton oil seal.

[0021] Furthermore, the packing seal structure includes:

[0022] An annular seat plate is fixed to the rotating drum seat;

[0023] A sealing seat is sleeved on the outer periphery of the fixed feed pipe and fixedly connected to the annular seat plate;

[0024] The packing material is filled into the stuffing gland between the sealing seat and the fixed feed pipe;

[0025] A sealing ring is used to press the packing and is adjustablely fixed to the annular seat plate.

[0026] Compared with the prior art, the advantages or beneficial effects of the embodiments of this application include at least the following: 1. The method of combining rotary dehydration and extrusion dehydration is more in line with the material dehydration process; the material enters the rotary dehydration section from the feed port and is pre-dehydrated first, and most of the free water is quickly removed under the action of centrifugal force; then it enters the extrusion section to remove the remaining small amount of free water and bound water, so that the overall water content of the material is low and uniform, and the dehydration rate of one piece of equipment is increased by more than 10%;

[0027] 2. The pre-dehydration and screw extrusion are integrated into one unit. This modular design reduces the floor space required, saves space, and reduces the need for process equipment and piping. It also reduces material handling costs and lowers the investment in this section by 50%.

[0028] 3. By adopting a multi-seal mechanism and a unique drainage mechanism, the problem of water leakage at the feed sealing end is solved, and the maintenance and spare parts costs for workers are reduced. Attached Figure Description

[0029] To more clearly illustrate the technical solutions of the embodiments of this utility model, the drawings used in the description of the embodiments will be briefly introduced below. Obviously, the drawings described below are only some embodiments of this utility model. For those skilled in the art, other drawings can be obtained based on these drawings without creative effort. The drawings are provided for reference and illustration only and are not intended to limit this utility model. Wherein:

[0030] Figure 1 This is a front view of the high-sealing pre-dehydration device of this utility model;

[0031] Figure 2 for Figure 1 Enlarged view on the right;

[0032] Figure 3 for Figure 1 Enlarged view of the rotating drum seat section;

[0033] Figure 4 for Figure 1 A three-dimensional image;

[0034] Reference numerals: 1. Feed hopper; 2. Rotary drum base; 2a. Large gear; 2b. Oil seal;

[0035] 3. Fixed feed pipe; 3a. Annular feed channel; 3b. Feed sealing seat; 3c. Feed sealing element;

[0036] 4. Intermediate bearing housing; 5. Intermediate bearing; 6. Drain pipe; 6a. Drain connector;

[0037] 7. Packing seal structure: 7a. Annular seat plate; 7b. Sealing seat; 7c. Packing; 7d. Sealing pressure ring;

[0038] 8. Drum screen; 9. Inner retaining ring of the drum; 10. Support drum; 11. Support wheel assembly; 12. Drum motor; 13. Drum gearbox; 14. Pinion; 14a. Pinion shaft; 15. Pinion bearing housing;

[0039] 16. Pre-dehydration tank; 16a. Pre-dehydration water collection hopper;

[0040] 17. Extrusion inlet seat;

[0041] 18. Extrusion rotor; 18a. Extrusion rotor shaft; 18b. Helical blade. Detailed Implementation

[0042] In the following description of this utility model, the terms "upper", "lower", "front", "rear", "left", "right", "inner", "outer", etc., indicate the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings, and are only for the convenience of describing this utility model and simplifying the description, and do not mean that the device must have a specific orientation.

[0043] To make the technical means, creative features, achieved objectives and effects of this utility model easier to understand, the present utility model will be further described below with reference to specific illustrations. Obviously, the described embodiments are only some embodiments of this utility model, and not all embodiments.

[0044] Unless otherwise defined, all technical and scientific terms used herein have the same meaning as commonly understood by one of ordinary skill in the art to which this invention pertains. The terminology used herein is for the purpose of describing particular embodiments only and is not intended to be limiting of the invention.

[0045] like Figures 1 to 4 As shown, the high-sealing pre-dehydration device of this utility model includes a pre-dehydration chamber 16, and an annular extrusion inlet seat 17 which is embedded in the outlet end side wall of the pre-dehydration chamber 16. The two ends of the extrusion rotor 18 are closed and respectively connected to the squeezing rotor shaft 18a. The inlet end of the extrusion rotor 18 extends through the central hole of the extrusion inlet seat 17 into the inner cavity of the pre-dehydration chamber 16.

[0046] The inner cavity of the pre-dehydration tank 16 is equipped with a drum screen 8, and multiple screen holes are evenly distributed on the circumference of the drum screen 8 for drainage. The bottom of the pre-dehydration tank 16 is equipped with a pre-dehydration hopper 16a for collecting the drainage from the drum screen 8.

[0047] Flanges are welded to both ends of the drum screen 8. The outlet flange of the drum screen 8 is connected to the inner retaining ring 9 of the drum. The inner retaining ring 9 includes a reduced diameter section and a flared opening that connects to the outlet of the drum screen 8. Multiple axially extending and evenly distributed reinforcing ribs are welded to the outer periphery of the drum screen 8 and the inner retaining ring 9 to improve strength. A supporting roller 10 is fitted around the reinforcing ribs of the reduced diameter section of the inner retaining ring 9 as a roller track.

[0048] The outlet end of the inner retaining ring 9 of the roller is embedded in the groove of the extrusion inlet seat 17, with gaps between them to form a labyrinth seal. Water seeping out from the gap is discharged into the pre-dehydration hopper 16a below.

[0049] The outer periphery of the support roller 10 is provided with three support wheel assemblies 11 that abut against the outlet end of its outer wall. The three sets of support wheel assemblies 11 are distributed in an equilateral triangle to support the inner end of the drum screen 8.

[0050] The inlet end of the drum screen 8 is connected to a rotating drum seat 2 coaxial with it. The two are fixed to each other by flanges and bolts. The rotating drum seat 2 is located on the outside of the pre-dehydration tank 16. The outer edge of the flange at the outlet end of the rotating drum seat 2 is embedded in the central hole of the side wall at the inlet end of the pre-dehydration tank 16 and is sealed to each other by the skeleton oil seal 2b.

[0051] Two sets of support wheel assemblies 11 are symmetrically arranged below the outlet end of the rotating drum seat 2, and as mentioned above, their height can be precisely adjusted. The base of the two support wheel frames is fixed to the outer wall of the inlet end of the pre-dehydration tank 16 with screws. The rotating drum seat 2, the drum screen 8, the inner drum retaining ring 9, and the support drum 10 are fixedly connected to form a whole for centrifugal dehydration, and are stably supported at both ends by a total of five drum support wheels.

[0052] The outer diameter of the inlet end of the rotating drum seat 2 is smaller than the outer diameter of the outlet end, and a large gear 2a is fixed to the outer circumference of the inlet end. A small gear 14 meshes with the bottom of the large gear 2a. The small gear 14 is fixed in the middle of the small gear shaft 14a, and both ends of the small gear shaft 14a are supported in small gear bearing seats 15. The bottom of the two small gear bearing seats 15 is fixed to the base by brackets. One end of the small gear shaft 14a is connected to the output shaft of the drum reducer 13 through a coupling. The input end of the drum reducer 13 is driven by the drum motor 12.

[0053] The inner cavity of the rotating drum base 2 is provided with a fixed feed pipe 3 coaxial with it. The outlet end of the fixed feed pipe 3 passes through the center hole of the end plate at the outlet end of the rotating drum base 2, so that the outlet of the fixed feed pipe 3 communicates with the inner cavity space of the drum screen 8. The squeezing rotor shaft 18a at the inlet end of the extrusion rotor 18 passes through the fixed feed pipe 3, and an annular feed channel 3a is formed between the squeezing rotor shaft 18a and the fixed feed pipe 3. The outer side of the rotating drum base 2 is provided with a feed hopper 1, which is fixed to the external steel beam or the connection port. The chute outlet at the lower end of the feed hopper 1 is inserted into the inlet end of the fixed feed pipe 3 and welded to it.

[0054] The inlet end of the fixed feed pipe 3 is provided with a feed sealing seat 3b to seal it. The inner circumference of the feed sealing seat 3b is fitted with a feed sealing element 3c to achieve a seal with the extrusion rotor shaft 18a.

[0055] Material such as starch enters the annular feed channel 3a from the feed hopper 1 and then enters the inner cavity of the drum screen 8 along the annular feed channel 3a. The drum motor 12 drives the pinion shaft 14a and the pinion 14 to rotate through the drum reducer 13. The pinion 14 drives the large gear 2a to rotate, and the large gear 2a drives the rotating drum base 2, the drum screen 8, the inner drum retaining ring 9, and the support drum 10 to rotate synchronously. Under the action of centrifugal force, a large amount of free water in the starch that has just been fed in quickly passes through the drum screen 8 for rapid dehydration and falls into the pre-dehydration hopper 16a for discharge. After the free water has been removed, the material is fed into the inner cavity of the conical screen frame by the spiral blades 18b of the extrusion rotor 18, where a small amount of free water and bound water are further squeezed out.

[0056] An intermediate bearing 5 is provided on the outer wall of the discharge end of the fixed feed pipe 3. The intermediate bearing 5 is installed in the intermediate bearing seat 4 and has sealing rings at both ends to form the first seal. The inner end face of the intermediate bearing seat 4 is fixedly connected to the outlet end plate of the rotating drum seat 2. The end face of the intermediate bearing seat 4 has an annular tenon that fits into the annular groove in the center of the outlet end plate of the rotating drum seat 2 to achieve accurate positioning. The intermediate bearing 5 enables the fixed feed pipe 3 to achieve a stable structure with support at both ends, and at the same time provides auxiliary support for the rotating drum seat 2. The outer ring of the bearing rotates with the rotating drum seat 2.

[0057] The intermediate bearing housing 4 is symmetrically provided with at least two radially penetrating bearing housing drain ports on one side near the pre-dewatering tank 16. The outer ports of the bearing housing drain ports are connected to the drain holes on the inner wall of the rotating drum housing 2 through drain pipes 6 and drain connectors 6a, respectively. The outlet of the drain hole of the rotating drum housing 2 is connected to the outer space of the drum screen 8 in the pre-dewatering tank 16. In this way, a very small amount of material and water flowing towards the intermediate bearing 5 can be discharged in advance through the drain pipes 6, flowing back to the outside of the drum screen 8 and into the pre-dewatering water collection hopper 16a for recycling; thus protecting the intermediate bearing 5 and extending its service life.

[0058] A packing seal structure 7 is provided between the inner cavity inlet end of the rotating drum seat 2 and the outer wall of the fixed feed pipe 3, forming a second seal. The packing seal structure 7 includes an annular seat plate 7a, a sealing seat 7b, and a sealing pressure ring 7d. The outer edge of the annular seat plate 7a is fixed to the inner step of the rotating drum seat 2 by screws. The outer periphery of the sealing seat 7b is fixed in the central hole of the annular seat plate 7a and fits around the outer periphery of the fixed feed pipe 3. The inner end, i.e., the bottom, of the sealing seat 7b is bent towards the outer wall of the fixed feed pipe 3 to form a clearance fit. A stuffing box is formed between the cylinder of the sealing seat 7b and the outer wall of the fixed feed pipe 3. The stuffing box is filled with packing 7c, such as graphite packing or other sealing elements. The sealing pressure ring 7d is inserted into the outer port of the sealing seat 7b to compress the packing 7c, mainly sealing fibers and dust. The outer end of the sealing pressure ring 7d has an outwardly bent flange, which is connected to the annular seat plate 7a by multiple screws, allowing adjustment of the compression force on the packing 7c.

[0059] The above description is merely a preferred embodiment of the present utility model, showing and describing the basic principles, main features, and advantages of the present utility model. It is not intended to limit the scope of patent protection of the present utility model. Those skilled in the art should understand that the present utility model is not limited to the above embodiments. In addition to the above embodiments, the present utility model may have other implementations without departing from the spirit and scope of the present utility model. Various changes and improvements to the present utility model are also possible. All technical solutions formed by equivalent substitutions or equivalent transformations fall within the scope of protection claimed by the present utility model. The scope of protection claimed by the present utility model is defined by the appended claims and their equivalents. Technical features not described in the present utility model can be implemented by or using existing technology, and will not be elaborated here.

Claims

1. A pre-dewatering device with high sealing performance, comprising a pre-dewatering tank (16), the bottom of the pre-dewatering tank (16) being provided with a pre-dewatering water accumulation hopper (16a), characterized in that: The pre-dehydration tank (16) is equipped with a rotary dehydration device, which includes: A drum screen (8) is rotatably disposed inside the pre-dehydration tank (16) and has a number of screen holes; The rotating drum seat (2) is coaxially fixed with the drum screen (8) and extends out of the feed end of the pre-dehydration box (16); The fixed feed pipe (3) is coaxially located in the inner cavity of the rotating drum seat (2), its inlet end is connected to the chute of the feed hopper (1), and its outlet end is connected to the inner cavity space of the drum screen (8). The intermediate bearing seat (4) is fixed to the center of the end plate at the discharge end of the rotating drum seat (2) and is supported at the discharge end of the fixed feed pipe (3) by the intermediate bearing (5). The two sides of the intermediate bearing (5) are respectively provided with sealing rings. The packing seal structure (7) is located between the feed end of the fixed feed pipe (3) and the rotating drum seat (2).

2. The high sealability pre-dewatering device according to claim 1, wherein The inner cavity of the drum screen (8) is coaxially provided with an extrusion rotor (18). The squeezing rotor shaft (18a) at the inlet end of the extrusion rotor (18) passes through the fixed feed pipe (3). The inlet end of the fixed feed pipe (3) is provided with a feed sealing seat (3b). The center hole of the feed sealing seat (3b) is fitted with a feed sealing element (3c) to achieve rotational sealing with the squeezing rotor shaft (18a).

3. The high sealability pre-dewatering device according to claim 1, wherein The intermediate bearing seat (4) is symmetrically provided with radially penetrating bearing seat drain ports at one end near the outlet of the fixed feed pipe (3). The bearing seat drain ports are connected to the outer peripheral space of the drum screen (8) inside the pre-dehydration tank (16) via the drain pipe (6) and the drain connector (6a).

4. The high-sealing pre-dehydration device according to claim 1, characterized in that: The outlet end of the drum screen (8) is connected to an inner drum retaining ring (9). The outlet end of the inner drum retaining ring (9) is embedded in the groove of the extrusion inlet seat (17) and forms a labyrinth seal. The extrusion inlet seat (17) is fixed to the discharge end side wall of the pre-dehydration box (16).

5. The high-sealing pre-dehydration device according to claim 1, characterized in that: The outer edge of the outlet flange of the rotary drum seat (2) is embedded in the central hole of the inlet side wall of the pre-dehydration tank (16) and is sealed to each other by the skeleton oil seal (2b).

6. The high-sealing pre-dehydration device according to any one of claims 1 to 5, characterized in that: The packing seal structure (7) includes: An annular seat plate (7a) is fixed to the rotating drum seat (2); A sealing seat (7b) is sleeved on the outer periphery of the fixed feed pipe (3) and fixedly connected to the annular seat plate (7a); The packing material (7c) is filled in the stuffing box between the sealing seat (7b) and the fixed feed pipe (3); A sealing ring (7d) presses the packing (7c) and is adjustablely fixed to the annular seat plate (7a).

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