High dryness decanter centrifuge

Abstract

The present invention discloses a high-dryness horizontal screw centrifuge, comprising a housing, a drum rotatably connected therein, a spiral propeller rotatably connected to the drum at a speed difference from the drum; the drum comprises a pipe fitting and a second tapered tube; the spiral propeller comprises a barrel, a first spiral propeller blade and a second spiral propeller blade are fixed to the barrel, the outer contour of the second spiral propeller blade is conical and consistent with the taper of the second tapered tube; the barrel is provided with a cavity located between the first and second spiral propeller blades, the cavity is provided with a material inlet opened on the barrel, a material inlet pipe is provided in the barrel, the inner end of the material inlet pipe is provided with a feed outlet located at the cavity; the taper of the pipe fitting is between 0.1° and 10°. The structural design of the present invention is ingenious and reasonable, can greatly increase the dryness of the material, and is worthy of promotion and application.

Description

Technical Field

[0001] The invention relates to a device, in particular to a high-dryness horizontal screw centrifuge. Background Art

[0002] The decanter centrifuge is a horizontal spiral unloading, continuously operating sedimentation device. It is currently widely used for solid-liquid separation and dehydration in municipal sludge dewatering, water plant sludge dewatering, industrial and agricultural wastewater treatment, petrochemical, food, pharmaceutical and other industries. Its working principle is as follows: the drum and the screw pusher rotate in the same direction at high speed with a certain differential speed. Material is continuously introduced into the inner barrel of the screw pusher through the feed pipe and accelerated before entering the drum. Under the action of centrifugal force, the heavier solids are deposited on the drum wall to form a sediment layer. The screw pusher continuously pushes the deposited solids to the cone section of the drum, where they are discharged through the mud outlet. The lighter liquid phase forms the inner clarifying section and is discharged through the clear liquid outlet at the other end of the drum. Due to structural defects, the current centrifuges all use straight pipes at the clear liquid outlet. When the material is discharged from the centrifuge with this type of centrifuge, its moisture content will remain above 32% (for inorganic materials) or above 82% (for organic materials). The moisture content cannot be reduced, which causes problems in transportation and storage of discharged materials, and is not conducive to efficient, safe, and low-moisture material processing.

[0003] Chinese utility model patent CN201220375271.1 discloses a screw pusher and a decanter centrifuge using the same, wherein the clear liquid outlet section adopts a straight pipe, so that the moisture content of the solid phase cannot be further reduced. Summary of the Invention

[0004] The present invention aims to solve the above-mentioned shortcomings of the prior art and provide a high-dryness horizontal screw centrifuge that can greatly reduce the moisture content of the material and make the material highly dry, thereby meeting the needs of enterprises for easy handling of the moisture content of the solid phase when performing solid-liquid separation on the material.

[0005] The present invention solves the technical problem by adopting the following technical solution: the high-dryness horizontal screw centrifuge comprises a cover shell, a drum is rotatably connected in the cover shell, a spiral propeller is rotatably connected in the drum with a speed difference from that of the drum; the drum and the spiral propeller are both driven to rotate by a motor, the drum comprises a pipe and a connected second conical tube, the taper direction of the pipe and the second conical tube are consistent; the spiral propeller comprises a cylinder body, a first spiral propeller blade and a second spiral propeller blade connected to the first spiral propeller blade are spirally fixed on the cylinder body, the outer contour of the first spiral propeller blade is conical and consistent with the taper of the pipe, the outer contour of the second spiral propeller blade is conical and consistent with the taper of the second conical tube; a cavity located between the first spiral propeller blade and the second spiral propeller blade is provided on the cylinder body, a material inlet is provided at the cavity, a material inlet pipe is provided in the cylinder body, and a feed outlet located at the cavity is provided at the inner end of the material inlet pipe; a liquid outlet is provided on the left side of the first spiral propeller blade of the rotary drum, and a slag outlet is provided on the right side of the second spiral propeller blade of the rotary drum. The function of the drum and the screw propeller here is to utilize the differential to enable the drum and the screw propeller to maintain a constant speed difference, so that the material can be separated from the solid and liquid and discharged; the function of the pipe and the second conical tube here is to give the material a centripetal force when separating, so that the solid-liquid separation operation of the material can be performed better; the first spiral propeller blade and the second spiral propeller blade connected to the first spiral propeller blade are spirally fixed on the cylinder body here, the outer contour of the first spiral propeller blade is conical and consistent with the taper of the inner cavity of the pipe, and the outer contour of the second spiral propeller blade is conical and consistent with the taper of the second conical tube. The function is to make the solid-liquid separation of the material more thorough and the water content of the solid phase lower; the function of the cavity, material inlet, material inlet pipe, and feed outlet here is to inject the material into the drum for solid-liquid separation; the function of the liquid outlet here is to discharge the clarified liquid; the function of the slag outlet here is to discharge the solid phase of the material.

[0006]

[0007] Further improvement, the pipe fitting is a tapered pipe, and the taper of the pipe fitting is 0.1° to 10°. The role of the taper of the pipe fitting in the range of 0.1° to 10° is to increase the centripetal force, thereby improving the ability of the material to separate water.

[0008]

[0009] Further improvement, the taper of the pipe fitting is 2° to 3°. The purpose of the taper of the pipe fitting is to minimize the moisture content of the material, and to reduce the moisture content of the solid matter at the slag outlet to 20% to 25% (inorganic materials) and 70% to 75% (organic slag moisture content).

[0010] Further refinement is achieved by welding and securing the pipe fitting together with several third conical tubes. Each third conical tube has a taper ranging from 0.1° to 10°, with the taper gradually increasing from the material inlet to the liquid outlet. The purpose of these third conical tubes is to secure the pipe fitting together, thereby creating different centripetal forces at each section, further facilitating drainage of the clarified liquid (liquid phase). At least two third conical tubes are required.

[0011] As a further improvement, a set of overflow ports are evenly distributed along the center of the cylinder at the inner end of the first spiral propulsion blade. The overflow ports allow the clarified liquid to quickly pass through the first spiral propulsion blade and be discharged from the liquid outlet, thereby accelerating the solid-liquid separation of the material and further reducing the moisture content of the solid phase (discharge residue).

[0012] Further improvement, the size of each overflow port gradually increases along the direction of the large opening of the pipe fitting. Here, the effect of gradually increasing the size of each overflow port along the direction of the large opening of the pipe fitting is that the clarified liquid can be discharged more smoothly and quickly.

[0013] A further improvement is the installation of a barrier plate at the material inlet, which is fixed to the drum and separates the material inlet. The barrier plate has a hole with a cross-section larger than the material inlet pipe, and the feed outlet is located on one side of the barrier plate. The function of the barrier plate is to regulate the amount of material entering the drum, thereby achieving a better solid-liquid separation effect.

[0014] As a further improvement, an end shaft is fixed to the right end of the cylinder, and an inclined guide surface is provided on the left side of the end shaft. The function of the inclined guide surface is to enable the solid phase to be discharged more smoothly from the slag outlet, thereby preventing the solid phase from accumulating and crowding the slag outlet.

[0015] For further improvement, a baffle fixed to the cylinder is provided on the left side of the second spiral propulsion blade. The function of the baffle is to squeeze the material so that the solid phase discharged through the slag outlet will be drier and have a lower moisture content.

[0016] The beneficial effects of the present invention are as follows: the structural design of the present invention is ingenious and reasonable, the use of the drum and the spiral propeller can make use of the differential to make the drum and the spiral propeller maintain a constant speed difference, thereby being able to separate the solid and liquid of the material and discharge it, the use of the pipe fittings and the second conical tube can give the material a centripetal force when separating, thereby being able to better separate the solid and liquid of the material, the use of the first spiral propulsion blade and the second spiral propulsion blade connected with the first spiral propulsion blade spirally fixed on the cylinder, the outer contour of the first spiral propulsion blade is conical and consistent with the taper of the pipe fitting, the second spiral propulsion blade is continuous with the first spiral propulsion blade, the outer contour of the first spiral propulsion blade is conical and consistent with the taper of the pipe fitting, and the second spiral propulsion blade is continuous with the first spiral propulsion blade, and the first ... The outer contour of the spiral propulsion blade is conical and consistent with the taper of the second conical tube, so that the solid-liquid separation of the material is more thorough and the moisture content of the solid phase is lower. The cavity, material inlet, material inlet pipe and feed outlet can be used to inject the material into the drum for solid-liquid separation. The taper of the pipe fitting is 0.1° to 10°, which can increase the centripetal force and thus improve the ability of the material to separate water. The liquid outlet can be used to discharge the clarified liquid, and the slag outlet can be used to discharge the solid phase of the material. The structural design of the present invention is ingenious and reasonable, which can greatly increase the dryness of the material and is worthy of promotion and application. BRIEF DESCRIPTION OF THE DRAWINGS

[0017] Figure 1 It is a structural schematic diagram of the present invention;

[0018] Figure 2 for Figure 1 A local enlarged view of area A;

[0019] Figure 3 for Figure 1 A local enlarged view of area B;

[0020] Figure 4 for Figure 2 CC cross-section diagram;

[0021] Figure 5 Schematic diagram of the flow of the overflow port change in the first spiral propulsion blade of the present invention;

[0022] Figure 6 It is a structural schematic diagram of the middle end shaft of the present invention;

[0023] Figure 7 It is a side view of the middle end shaft of the present invention;

[0024] Figure 8 Schematic diagram of the structure of the pipe fitting in the second embodiment of the present invention.

[0025] Explanation of the reference numerals: cover shell 1, drum 2, pipe 2-1, third conical tube 2-1a, second conical tube 2-2, screw propeller 3, cylinder 3-1, first spiral propulsion blade 3-1a, second spiral propulsion blade 3-1b, cavity 3-1c, material inlet 3-1d, feed outlet 4-1, liquid outlet 2a, slag outlet 2b, overflow port 3a-1a, material inlet pipe 4, baffle plate 5, end shaft 6, inclined guide surface 6-1, blocking plate 7. DETAILED DESCRIPTION

[0026] The following will clearly and completely describe the technical solutions in the embodiments of the present invention in conjunction with the accompanying drawings. Obviously, the described embodiments are only part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without making creative efforts are within the scope of protection of the present invention.

[0027] In the description of the present invention, it should be understood that the terms "center", "longitudinal", "lateral", "length", "width", "thickness", "up", "down", "front", "back", "left", "right", "vertical", "horizontal", "top", "bottom", "inside", "outside", "clockwise", "counterclockwise" and the like to indicate orientations or positional relationships based on the orientations 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 understood as limiting the present invention.

[0028] Furthermore, the terms "first" and "second" are used for descriptive purposes only and should not be construed as indicating or implying relative importance or implicitly specifying the number of the technical features being referred to. Thus, a feature identified as "first" or "second" may explicitly or implicitly include one or more of the features. In the description of the present invention, "plurality" means two or more, unless otherwise specifically defined.

[0029] The present invention will be further described below in conjunction with the accompanying drawings:

[0030] Example 1:

[0031] Refer to the attached Figure 1 、 2, 3, 4, 5, 6, 7: This high-dryness horizontal screw centrifuge includes a cover 1, a drum 2 is rotatably connected inside the cover 1, a screw propeller 3 with a speed difference from that of the drum 2 is rotatably connected inside the drum 2, the drum 2 and the screw propeller 3 are both driven to rotate by a motor, the drum 2 includes a pipe 2-1 and a connected second conical tube 2-2, the taper direction of the pipe 2-1 and the second conical tube 2-2 are consistent; the screw propeller 3 includes a cylinder 3-1, a first spiral propeller blade 3-1a and a second spiral propeller blade 3-1b continuous with the first spiral propeller blade 3-1a are spirally fixed on the cylinder 3-1, the outer contour of the first spiral propeller blade 3-1a is conical and consistent with the taper of the pipe 2-1, the outer contour of the second spiral propeller blade 3-1b is conical and consistent with the taper of the second conical tube 2-2; the cylinder 3-1 is provided with a and the second spiral propulsion blade 3-1b, the cavity 3-1c is provided with a material inlet 3-1d opened on the cylinder 3-1, the cylinder 3-1 is provided with a material inlet pipe 4, the inner end of the material inlet pipe 4 is provided with a feed outlet 4-1 located at the cavity 3-1c; the left end of the drum 2 is provided with a liquid outlet 2a on the side of the first spiral propulsion blade 3-1a, and the right end of the drum 2 is provided with a slag outlet 2b on the side of the second spiral propulsion blade 3-1b.

[0032] The pipe fitting 2-1 is a pipe fitting, and the taper of the pipe fitting 2-1 is 0.1° to 10°;

[0033] The taper of the pipe fitting 2-1 is 2° to 3°.

[0034] The inner end of the first spiral propulsion blade 3-1a is provided with a group of overflow ports 3a-1a evenly distributed along the center of the cylinder 3-1.

[0035] The size of each overflow port 3a-1a gradually increases along the side of the larger opening of the pipe 2-1.

[0036] A barrier plate 5 is provided at the material inlet 3-1d to separate the material inlet 3-1d and fixed to the cylinder 3-1. The barrier plate 5 is provided with a through hole 5-1 having a cross section larger than that of the material inlet pipe 4. The feed outlet 4-1 is located on one side of the barrier plate 5.

[0037] An end shaft 6 is fixed to the right end of the cylinder 3 - 1 , and an inclined guide surface 6 - 1 is provided on the left side of the end shaft 6 .

[0038] A blocking plate 7 fixed to the cylinder 3-1 is provided on the left side of the second spiral propulsion blade 3-1b.

[0039] The working principle of the present invention is as follows: when the screw propeller 3 and the drum 2 are used to separate the solid and liquid of the material, the drum 2 and the screw propeller 3 rotate at high speed in the same direction at a certain differential speed through the differential, and the material is continuously introduced into the inner cylinder of the screw propeller 3 from the material inlet pipe 4 and accelerated before entering the drum 2. Under the action of centrifugal force, the heavier solid phase is deposited on the wall of the drum 2 to form a sediment layer, and the screw propeller 3 continuously pushes the deposited solid phase to the second conical tube 2-2 section of the drum 2 and is discharged through the slag outlet 2b, and the lighter liquid phase forms the inner layer clarification section and is discharged from the liquid outlet 2a at the other end of the drum 2. Since the inner cavity of the pipe 2-1 is conical in shape, the centrifugal force on the material is greater, and the solid-liquid separation of the material will be more obvious, so that the water content of the discharged solid phase will be lower, which is worthy of promotion and application.

[0040] Example 2:

[0041] Refer to the attached Figure 8 This high-dryness horizontal screw centrifuge includes a housing 1, a drum 2 is rotatably connected to the housing 1, and a screw propeller 3 is rotatably connected to the drum 2 and has a speed difference with the drum 2;

[0042] The drum 2 includes a pipe 2-1 and a second tapered tube 2-2 connected thereto, the pipe 2-1 and the second tapered tube 2-2 having the same taper direction; the screw propeller 3 includes a cylinder 3-1, on which a first spiral propulsion blade 3-1a and a second spiral propulsion blade 3-1b continuous with the first spiral propulsion blade 3-1a are spirally fixed, the outer contour of the first spiral propulsion blade 3-1a being tapered and consistent with the taper of the pipe 2-1, and the outer contour of the second spiral propulsion blade 3-1b being tapered and consistent with the taper of the second tapered tube 2-2; the cylinder 3-1 is provided with a cavity 3-1c located between the first spiral propulsion blade 3-1a and the second spiral propulsion blade 3-1b, the cavity 3-1c being provided with a material inlet 3-1d opened on the cylinder 3-1, a material inlet pipe 4 being provided in the cylinder 3-1, the inner end of the material inlet pipe 4 being provided with a feed outlet 4-1 located at the cavity 3-1c;

[0043] A liquid outlet 2a is provided on the left side of the first spiral propulsion blade 3-1a of the rotary drum 2, and a slag outlet 2b is provided on the right side of the second spiral propulsion blade 3-1b of the rotary drum 2.

[0044] The pipe fitting 2-1 is formed by welding and fixing a plurality of third conical tubes 2-3. The taper of each third conical tube 2-3 is 0.1° to 10°. The taper of each third conical tube 2-3 gradually increases from the material inlet 3-1d to the liquid outlet 2a.

[0045] The inner end of the first spiral propulsion blade 3-1a is provided with a group of overflow ports 3a-1a evenly distributed along the center of the cylinder 3-1.

[0046] The size of each overflow port 3a-1a gradually increases along the side of the larger opening of the pipe 2-1.

[0047] A barrier plate 5 is provided at the material inlet 3-1d to separate the material inlet 3-1d and fixed to the cylinder 3-1. The barrier plate 5 is provided with a through hole 5-1 having a cross section larger than that of the material inlet pipe 4. The feed outlet 4-1 is located on one side of the barrier plate 5.

[0048] An end shaft 6 is fixed to the right end of the cylinder 3 - 1 , and an inclined guide surface 6 - 1 is provided on the left side of the end shaft 6 .

[0049] A blocking plate 7 fixed to the cylinder 3-1 is provided on the left side of the second spiral propulsion blade 3-1b.

[0050] The working principle of the second embodiment is basically the same as that of the first embodiment. The only difference is that the pipe fitting 2-1 is formed by splicing and fixing the third conical tubes 2-1a. In this way, the pipe fitting 2-1 with different angles can be processed according to different types of materials, thereby achieving better solid-liquid separation and lower solid phase moisture content, which is worthy of promotion and application.

[0051] Although the invention has been shown and described with reference to preferred embodiments, it will be understood by those skilled in the art that various changes in form and details may be made therein within the scope of the claims.

Claims

1. A high-dryness horizontal screw centrifuge, comprising a housing (1), characterized by: A rotating drum (2) is rotatably connected inside the housing (1), and a screw propeller (3) is rotatably connected inside the rotating drum (2) and has a rotation speed difference with the rotating drum (2); The rotating drum (2) comprises a pipe (2-1) with a conical inner cavity and a second conical tube (2-2) connected thereto, wherein the taper direction of the pipe (2-1) and the second conical tube (2-2) are consistent; The screw propeller (3) comprises a cylinder (3-1), a first screw propulsion blade (3-1a) and a second screw propulsion blade (3-1b) continuous with the first screw propulsion blade (3-1a) being fixed in a spiral shape on the cylinder (3-1), the outer contour of the first screw propulsion blade (3-1a) being conical and consistent with the taper of the inner cavity of the pipe (2-1), and the outer contour of the second screw propulsion blade (3-1b) being conical and consistent with the taper of the inner cavity of the second conical pipe (2-2); The cylinder (3-1) is provided with a cavity (3-1c) located between the first spiral propulsion blade (3-1a) and the second spiral propulsion blade (3-1b); the cavity (3-1c) is provided with a material inlet (3-1d) opened on the cylinder (3-1); a material inlet pipe (4) is provided in the cylinder (3-1); and the inner end of the material inlet pipe (4) is provided with a material feed outlet (4-1) located at the cavity (3-1c); A liquid outlet (2a) is provided on the side of the first spiral propulsion blade (3-1a) at the left end of the rotating drum (2), and the liquid outlet (2a) is arranged on the left end surface of the pipe (2-1). A slag outlet (2b) is provided on the side of the second spiral propulsion blade (3-1b) at the right end of the rotating drum (2). The pipe fitting (2-1) is a tapered pipe, and the taper of the pipe fitting (2-1) is 0.1° to 10°.

2. The high-dryness horizontal screw centrifuge according to claim 1, characterized in that: The taper of the pipe (2-1) is 2° to 3°.

3. The high-dryness horizontal screw centrifuge according to claim 1, characterized in that: The pipe fitting (2-1) is fixed together by a plurality of third conical tubes (2-3), the taper of each third conical tube (2-3) is 0.1° to 10°, and the taper of each third conical tube (2-3) gradually increases from the material inlet (3-1d) to the liquid outlet (2a).

4. The high-dryness horizontal screw centrifuge according to claim 1, characterized in that: The inner end of the first spiral propulsion blade (3-1a) is provided with a group of overflow ports (3a-1a) evenly distributed along the center of the cylinder (3-1).

5. The high-dryness horizontal screw centrifuge according to claim 4, characterized in that: The size of each overflow port (3a-1a) gradually increases along the side of the large opening of the pipe member (2-1).

6. The high-dryness horizontal screw centrifuge according to claim 1, characterized in that: A baffle plate (5) is provided at the material inlet (3-1d) to separate the material inlet (3-1d) and is fixed to the cylinder (3-1). The baffle plate (5) is provided with a through hole (5-1) having a cross-section larger than that of the material inlet pipe (4). The feed outlet (4-1) is located on one side of the baffle plate (5).

7. The high-dryness horizontal screw centrifuge according to claim 1, characterized in that: An end shaft (6) is fixed to the right end of the cylinder (3-1), and an inclined guide surface (6-1) is provided on the left side of the end shaft (6).

8. The high-dryness horizontal screw centrifuge according to claim 1, characterized in that: A blocking plate (7) fixed on the cylinder (3-1) is provided on the left side of the second spiral propulsion blade (3-1b).

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