Horizontal screw centrifuge

Abstract

The utility model belongs to the technical field of centrifugal machines, and particularly relates to a horizontal screw centrifugal machine which comprises a centrifugal machine body and a main motor, the centrifugal machine body comprises a machine shell and a rotary drum, the rotary drum is coaxially installed in the machine shell, an end cover shaft of the rotary drum extends out of the machine shell, a gear speed increasing box is arranged between the main motor and the machine shell, and the gear speed increasing box comprises a box body. An input shaft, an intermediate shaft, a multi-stage gear transmission mechanism and an output shaft are arranged in the box body, and the input shaft, the intermediate shaft, the multi-stage gear transmission mechanism and the output shaft are sequentially in meshing transmission through gears; an output shaft of the main motor is connected with an input shaft of the speed-increasing gear box through an elastic coupling, and an output shaft of the speed-increasing gear box is in shaft key connection with the end cover of the rotary drum.

Description

Technical Field

[0001] This utility model relates to the field of centrifuge technology, and in particular to a horizontal screw centrifuge. Background Technology

[0002] In environmental applications, decanter centrifuges primarily refer to the dewatering of sludge generated during industrial and domestic wastewater treatment. With environmental issues now a global concern, the value of decanter centrifuges has become apparent. Previously, wastewater treatment plants or related facilities relied on self-sedimentation or belt filter presses for sludge dewatering and concentration. Tests have shown that reducing sludge moisture content from 98% to 80% can shrink its volume by a factor of 10. Therefore, decanter centrifuges, with their inherent advantages of large processing capacity, automated operation, and excellent dewatering effect, have been widely used and promoted in the field of environmental protection.

[0003] Existing horizontal decanter centrifuges typically use a motor connected to the rotor shaft via a V-belt to drive the rotation of the centrifuge body. This method has the following structural problems: 1. Power loss: Belt friction causes 10%-15% of ineffective power loss; 2. Poor dynamic performance: Insufficient rigidity of the transmission system and significant delay in speed response; 3. Inaccurate speed transmission: Belt drives are prone to elastic slippage and slippage, making them unsuitable for high-precision separation scenarios; 4. Maintenance complexity: Periodic adjustment of belt tension is required, resulting in high downtime for maintenance; 5. Environmental sensitivity: Humid and dusty environments can easily cause belt slippage or breakage. Utility Model Content

[0004] This invention provides a horizontal screw centrifuge with low power loss and precise transmission speed.

[0005] The present invention provides a horizontal screw centrifuge, comprising a centrifuge body and a main motor. The centrifuge body includes a casing and a drum, the drum being coaxially mounted within the casing. The drum end cap extends out of the casing. A gear speed increaser is arranged between the main motor and the casing. The gear speed increaser includes a housing, within which an input shaft, an intermediate shaft, a multi-stage gear transmission mechanism, and an output shaft are arranged. The input shaft, intermediate shaft, multi-stage gear transmission mechanism, and output shaft are sequentially driven by gear meshing. The output shaft of the main motor is connected to the input shaft of the gear speed increaser via a flexible coupling, and the output shaft of the gear speed increaser is keyed to the drum end cap.

[0006] The beneficial effects are as follows: Significantly reduced power loss: Replacing traditional belt drives with gearboxes eliminates 10%-15% power loss caused by belt friction, improving energy transfer efficiency. Improved transmission accuracy: Gear meshing avoids belt slippage or elastic slippage, ensuring strict synchronization between the drum speed and motor output, suitable for high-precision separation scenarios. Optimized dynamic response: Rigid gear transmission systems have higher rigidity than belt drives, reducing speed response delay and improving centrifuge start-up, shutdown, and speed change performance. Compact structure: The gearbox is integrated between the main motor and the casing, saving space and facilitating overall layout. Reduced maintenance costs: No need for periodic belt tension adjustments, reducing downtime for maintenance.

[0007] Furthermore, an input gear, an intermediate gear, and an output gear are respectively installed on the input shaft, intermediate shaft, and output shaft of the gear speed increaser. The input gear, intermediate gear, and output gear are mounted on the corresponding shafts through positioning bearings. By constraining axial displacement, it is ensured that the gears only perform rotational motion, thereby reducing vibration and off-center load.

[0008] Furthermore, the total transmission ratio of the multi-stage gear transmission mechanism ranges from 1:1 to 10:1. The intermediate gear meshes with the first stage gear of the multi-stage gear transmission mechanism, and the last stage gear of the multi-stage gear transmission mechanism meshes with the output gear, which can flexibly match the speed requirements of different separation processes (such as low-speed dehydration or high-speed clarification).

[0009] Furthermore, each end of the casing is provided with a base, and the gear speed increaser is mounted on the corresponding base, forming a rigid connection with the centrifuge body to avoid displacement deviation caused by vibration during transmission.

[0010] Furthermore, the drum end cover shaft is mounted on the corresponding machine base via a support seat to prevent radial runout of the drum at high speeds and ensure dynamic balance.

[0011] Furthermore, an auxiliary motor is installed on the side of the base away from the main motor. The output shaft of the auxiliary motor is coaxially connected to the drum through a differential. The auxiliary motor can independently adjust the speed difference between the drum and the screw conveyor through the differential to optimize centrifugation efficiency.

[0012] Furthermore, power is transmitted sequentially through three pairs of gears, with each stage bearing a portion of the transmission ratio, thus avoiding excessively large single-stage gears or excessive loads.

[0013] Furthermore, the drive shafts of the three-stage gear transmission structure are arranged in parallel, saving space and making it suitable for the limited installation area between the centrifuge base and the drum. Attached Figure Description

[0014] Figure 1 This is a schematic diagram of the structure of a horizontal screw centrifuge;

[0015] Figure 2 for Figure 1 Schematic diagram of the structure of the medium gear speed increaser;

[0016] The attached diagram includes the following components: main motor 1, first coupling 2, left side base 3, feed pipe 4, gear speed increaser 5, input shaft 5-2, intermediate shaft 5-3, positioning bearing 5-4, three-stage gear transmission mechanism 5-5, output shaft 5-6, support base 6, drum 7, flat key 7-1, left end drum end cover shaft 7-2, housing 8, control system 9, differential 10, second coupling 11, and auxiliary motor 12. Detailed Implementation

[0017] This embodiment, in conjunction with the accompanying drawings, provides a detailed description of the connection relationships and functions of each part.

[0018] A type of horizontal decanter centrifuge, such as Figure 1 As shown, the machine includes a horizontally arranged housing 8, a rotating drum 7 coaxially arranged inside the housing 8, a discharge pipe on the side wall of the housing 8, a left machine base 3 and a right machine base at both ends of the housing 8, a main motor 1 and a gear speed increaser 5 arranged on the left side of the housing 8, and a differential 10 and an auxiliary motor 12 arranged on the right side of the housing 8.

[0019] The drum 7 has a left drum end cover shaft 7-2 and a right drum end cover shaft at its two ends. The left drum end cover shaft 7-2 has a feed pipe 4 inside or in the core. The left drum end cover shaft 7-2 extends out of the machine housing 8 and is mounted on a support base 6. The support base 6 is mounted on the left machine base 3. The right drum end cover shaft extends out of the machine housing 8 and is coaxially connected to the differential 10. The differential 10 is connected to the auxiliary motor 12 through a second coupling 11. Both the differential 10 and the auxiliary motor 12 are mounted on the right machine base.

[0020] The gear increaser 5 is located between the main motor 1 and the housing 8. The structure of the gear increaser 5 is as follows: Figure 2 As shown, it includes a gearbox housing 5, an input shaft 5-2, an intermediate shaft 5-3, a three-stage gear transmission mechanism 5-5, and an output shaft 5-6. Wherein:

[0021] 1. The output shaft of the main motor 1 is coaxial with the input shaft 5-2 of the gear speed increaser 5 and is connected by the first coupling 2. In this embodiment, both the first coupling 2 and the second coupling 11 are flexible couplings.

[0022] 2. The input shaft 5-2, intermediate shaft 5-3, and output shaft 5-6 of the gear speed increaser 5 are respectively equipped with an input gear, an intermediate gear, and an output gear via positioning bearings 5-4 on their shafts. The positioning bearings 5-4 support the gears on the shafts, constraining their axial displacement, allowing only rotational movement and ensuring transmission accuracy. The input gear meshes with the intermediate gear, the intermediate gear meshes with the first stage gear of the three-stage gear transmission mechanism, and the third stage gear of the three-stage gear transmission mechanism 5-5 meshes with the output gear. The power from the input shaft 5-2 is transmitted and increased in speed via the intermediate shaft 5-3 and the three-stage gear transmission mechanism 5-5 before being output via the output shaft 5-6.

[0023] 3. The output shaft 5-6 of the gear speed increaser 5 is connected to the end cover shaft of the left drum 7 via a flat key 7-1, so that the increased power is directly transmitted to the drum 7.

[0024] 4. The three-stage gear transmission mechanism 5-5 includes three transmission shafts (i.e., the first-stage, second-stage, and third-stage transmission shafts). These shafts are arranged in parallel to accommodate the limited installation space between the centrifuge base and the drum. The first-stage, second-stage, and third-stage gears are mounted on the first, second, and third-stage transmission shafts respectively via positioning bearings 5-4. Each gear is made of high-strength, wear-resistant alloy steel. The three gears mesh sequentially, and the transmission is distributed through a gear ratio, i = i1 × i2 × i3. Through a reasonable gear ratio design, the speed increase and torque transmission from the input shaft 5-2 to the output shaft 5-6 are achieved. The total transmission ratio ranges from 1:1 to 10:1, meeting the requirements of different operating conditions.

[0025] In this embodiment, the rotor 7 is made of high-strength, corrosion-resistant alloy material (such as titanium alloy or duplex stainless steel), combining lightweight and corrosion resistance, and can adapt to high speeds and harsh working conditions. The multi-stage speed increase design of the gearbox 5 significantly improves the operating speed of the rotor 7. Meanwhile, the use of flexible couplings and precision key connections reduces vibration. Combined with the PLC intelligent control system 9, the centrifuge achieves efficient, stable, and automated operation, making it suitable for high-precision separation applications in chemical, environmental protection, and other fields.

[0026] The above descriptions are merely embodiments of this utility model. Commonly known technical solutions and / or characteristics are not described in detail here. It should be noted that those skilled in the art can make various modifications and improvements without departing from the technical solution of this utility model. These modifications and improvements should also be considered within the scope of protection of this utility model, and will not affect the effectiveness of the implementation of this utility model or the practicality of the patent. The scope of protection claimed in this application should be determined by the content of its claims, and the specific embodiments described in the specification can be used to interpret the content of the claims.

Claims

1. A horizontal decanter centrifuge, comprising a centrifuge body and a main motor, wherein the centrifuge body includes a casing and a rotating drum, the rotating drum being coaxially mounted inside the casing, and the end cap of the rotating drum extending out of the casing, characterized in that: A gear speed increaser is arranged between the main motor and the housing. The gear speed increaser includes a housing, and an input shaft, an intermediate shaft, a multi-stage gear transmission mechanism, and an output shaft are arranged inside the housing. The input shaft, intermediate shaft, multi-stage gear transmission mechanism, and output shaft are sequentially driven by gear meshing. The output shaft of the main motor is connected to the input shaft of the gear speed increaser through a flexible coupling. The output shaft of the gear speed increaser is connected to the key of the drum end cover.

2. A horizontal decanter centrifuge according to claim 1, characterized in that: The input gear, intermediate gear, and output gear are respectively installed on the input shaft, intermediate shaft, and output shaft of the gear speed increaser. The input gear, intermediate gear, and output gear are mounted on the corresponding shafts through positioning bearings.

3. A horizontal decanter centrifuge according to claim 2, characterized in that: The total transmission ratio of the multi-stage gear transmission mechanism ranges from 1:1 to 10:

1. The intermediate gear meshes with the first stage gear of the multi-stage gear transmission mechanism, and the last stage gear of the multi-stage gear transmission mechanism meshes with the output gear.

4. A horizontal decanter centrifuge according to claim 3, characterized in that: Both ends of the housing are provided with bases, and the gear speed increaser is mounted on the corresponding bases.

5. A horizontal decanter centrifuge according to claim 4, characterized in that: The drum end cover shaft is mounted on the corresponding machine base via a support seat.

6. A horizontal decanter centrifuge according to claim 5, characterized in that: An auxiliary motor is installed on the base on the side away from the main motor. The output shaft of the auxiliary motor is coaxially connected to the drum through a differential.

7. A horizontal decanter centrifuge according to claim 6, characterized in that: The multi-stage gear transmission mechanism is a three-stage gear transmission structure.

8. A horizontal decanter centrifuge according to claim 7, characterized in that: The drive shafts of the three-stage gear transmission structure are arranged in parallel.

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