CN107008577A - A vertical spiral liquid-solid centrifuge with automatic cleaning function - Google Patents

Abstract

The present invention relates to the technical field of vertical centrifuges, and proposes a vertical spiral liquid-solid centrifuge with an automatic cleaning function. A plurality of high-pressure water channels are provided from top to bottom on the central axis of the spiral pusher near the outer wall of the central axis, and an annular water trough is provided on the upper end surface of the high-pressure water channel. A high-pressure water inlet channel connected to the annular water trough is provided on the static parts of the transmission device. A high-pressure nozzle is installed between every two layers of spiral blades on the outer wall of the central axis, and the high-pressure nozzle is connected to the high-pressure water channel; a high-pressure dynamic sealing device is installed between the static parts of the transmission device and its moving parts, and a high-pressure static sealing device is installed between the moving parts of the transmission device and its moving parts. Compared with the existing disassembly and assembly cleaning, the automatic cleaning function of the present invention saves at least 85% of the time for cleaning the drum and spiral pusher; and the automatic cleaning function has basically the same cleaning effect as the disassembly and assembly equipment for cleaning the drum and spiral pusher.

Description

A vertical spiral liquid-solid centrifuge with automatic cleaning function

technical field

The invention relates to the technical field of vertical centrifuges, in particular to the automatic cleaning function of a spiral separation type vertical centrifuge.

Background technique

The centrifuge uses the principle of different density and immiscible light, heavy liquid and solid phases in the mixed liquid to obtain different sedimentation velocities in the centrifugal force field, so as to achieve the purpose of separating layers or settling solid particles in the liquid. It is mainly used in chemical industry, mineral processing, petroleum, pharmaceutical, food and other industries, as well as sewage treatment with foul smell and other occasions that require sedimentation and separation of solid-containing suspensions.

Existing screw unloading sedimentation centrifuge mainly is made up of rotating drum, screw pusher, feeding pipe and transmission device. During the working process of concentration, dehydration, separation, clarification, purification and solid classification of the centrifuge, the material enters the inside of the screw propeller from the feed pipe, and then enters the drum from the outlet of the screw propeller for centrifugal separation. During the long-term operation of the centrifuge, due to the feed pressure and flow fluctuations and the adsorption force, the material will be adsorbed on the outer wall of the screw propeller, the blades and the inner wall of the drum to accumulate, thereby destroying the centrifuge. Dynamic balance affects the normal operation of the centrifuge. At the same time, if the centrifuge centrifuges to separate different material media successively, after each separation, if it is not thoroughly cleaned, the residual substances of the original centrifuged material medium adsorbed on the inner wall of the screw pusher will affect the material separated later. produce pollution. Cleaning centrifuges is more important for some industries, especially for pharmaceutical and food industries.

The screw pusher and the drum are inside the whole centrifuge. Generally, to clean them, these two parts must be disassembled from the centrifuge. After cleaning, these two parts are put back into the centrifuge. It becomes very difficult to clean the screw propeller and the drum inside the centrifuge.

Contents of the invention

The present invention aims to solve the problem of difficult cleaning of the screw pusher and drum inside the centrifuge, and proposes a vertical screw liquid-solid centrifuge with automatic cleaning function. Compared with the existing cleaning methods, it greatly improves cleaning efficiency.

In order to achieve the above object, the technical solution adopted by the present invention is: a vertical spiral liquid-solid centrifuge with automatic cleaning function is proposed, including a housing, a feeding pipe, a main motor, an auxiliary motor, a transmission, a multi-stage planetary Gear differential, screw pusher and drum, the screw pusher is located in the drum, the screw pusher includes a central shaft and a helical blade, and the helical blade is fixedly connected with the central shaft, and the feature is that the central shaft is close to the central There are several high-pressure water passages from top to bottom on the outer wall of the shaft. The upper end surface of the high-pressure water passage is provided with an annular water tank. The static part of the transmission device is provided with a high-pressure water inlet channel connected to the annular water tank. A high-pressure nozzle is installed between every two layers of spiral blades on the top, and the high-pressure nozzle communicates with the high-pressure water channel; a high-pressure dynamic sealing device is installed between the static part of the transmission device and its moving part, and a high-pressure dynamic sealing device is installed between the moving part of the transmission device and its moving part. High pressure static sealing device.

The number of the high-pressure water channels is 2-4.

The high-pressure nozzle is a three-way high-pressure nozzle, the angles between the direction of the three nozzles and the axial direction of the central axis are 35°～55°, 90° and 125°～145° respectively, and the diameters of the three nozzles are φ2mm～φ5mm .

The width of the annular water tank is slightly wider than the diameter of the high-pressure water channel.

The cross-sectional shape of the annular water tank is arc-shaped or square.

The diameter of the high-pressure water inlet channel is φ3mm˜φ15mm.

The high-pressure dynamic sealing device is a tooth-shaped combined seal for the rotating shaft, filled with PTEE+NBR/FKM; the high-pressure static sealing device is a copper or brass gasket.

The driving wheel of the main motor drives the driven wheel of the main motor through a V-belt or a synchronous belt, the driven wheel of the main motor is coaxially connected with the outer ring gear of the multi-stage planetary gear differential, and the outer ring gear of the multi-stage planetary gear differential It is coaxially connected with the drum; the driving wheel of the auxiliary motor drives the driven wheel of the auxiliary motor through a V-belt or a synchronous belt, and the driven wheel of the auxiliary motor is coaxially connected with the input shaft of the multi-stage planetary gear differential. The output shaft of the gear differential is coaxially connected with the screw pusher.

The main motor and the auxiliary motor are respectively controlled by two frequency converters, and the differential speed between the screw pusher and the drum is 0-10 RPM.

The helical blade adopts a hollow structure, that is, a plurality of openings are evenly and spaced along the circumference of the helical blade, and the total area of the openings accounts for 1/4 to 1/2 of the total area of the entire helical blade.

The present invention realizes the self-cleaning of the centrifuge by setting up a high-pressure water channel in the central shaft of the screw pusher and setting a three-way nozzle between every two layers of spiral blades on the outer wall of the central shaft. The automatic cleaning function of the present invention is different from that of the existing Compared with disassembly and assembly cleaning, the cleaning of the drum and screw feeder saves at least 85% of the time; and the automatic cleaning function is basically the same as the cleaning effect of the disassembly equipment cleaning drum and screw feeder.

Description of drawings

Fig. 1 is the overall structure schematic diagram of the present invention;

Figure 2 is an enlarged view of point I in Figure 1;

Fig. 3 is the top view of screw pusher;

In the figure: 1—feeding pipe, 2—driven wheel of auxiliary motor, 3—belt pulley, 4—driving wheel of auxiliary motor, 5—multi-stage planetary gear differential and driven wheel of main motor, 6—auxiliary motor, 7—transmission Device, 8—shell, 9—screw pusher, 10—drum, 11—overflow tank, 12—motor support frame, 13—underframe, 14—slag outlet, 15—overflow port, 16— Main motor, 17—main motor driving wheel, 18—high pressure water inlet, 19—high pressure dynamic seal, 20—high pressure static seal, 21—high pressure water channel, 22—three-way high pressure nozzle, 23—annular water tank, 24—spiral blade , 25-screw blade opening.

detailed description

The present invention will be described in detail below in conjunction with the accompanying drawings.

Example 1:

The vertical screw liquid-solid centrifuge with automatic cleaning function as shown in Figure 1 includes a housing 8, a feed pipe 1, a main motor 16, an auxiliary motor 6, a transmission device 7, a multi-stage planetary gear differential, a screw The pusher 9 and the drum 10, the screw pusher 9 is located in the drum 10, the driving wheel 17 of the main motor drives the driven wheel of the main motor through a V-belt or a synchronous belt, and the driven wheel of the main motor is differentially connected to the multi-stage planetary gear. The outer ring gear of the device is connected coaxially, and the outer ring gear of the multistage planetary gear differential is connected coaxially with the drum 10; the driving wheel 4 of the auxiliary motor drives the driven wheel 2 of the auxiliary motor through a V-belt or a synchronous belt, and the driven wheel 2 of the auxiliary motor It is coaxially connected with the input shaft of the multi-stage planetary gear differential. The multi-stage planetary gear differential is composed of 3-stage to 5-stage planetary gear sets, forming a transmission ratio of 1:64~1:1024, which is transmitted by the input shaft. The input power is transmitted by the output shaft, and the output shaft of the multistage planetary gear differential is coaxially connected with the screw pusher 9. The main motor 16 and the auxiliary motor 6 are respectively controlled by two frequency converters, and the differential speed between the screw pusher and the rotating drum is 0-10 RPM.

The drum is composed of a column section and a cone section, and the cone angle of the cone section is 2°~10°. The screw pusher is also composed of a column section and a cone section, and the segment position and cone angle are the same as the structure of the drum. The length ratio of the column section and the cone section of the drum is 2:1~1:1. The gap between the blade of the screw propeller and the drum is 0.5~3mm.

The screw pusher 9 includes a central shaft and a helical blade 24, the helical blade 24 is fixedly connected with the central shaft, and the helical blade adopts a hollow structure, that is, the helical blade is provided with four helical blade openings 25 evenly and at intervals along its circumference. The total area of the openings accounts for 1/4 to 1/2 of the total area of the entire spiral blade. The design of the hollow structure of the helical blade in the screw propeller will make the liquid and solid of the suspension start to separate before reaching the drum, which is beneficial to improve the separation efficiency and quality of the centrifuge.

There are 2 to 4 high-pressure water passages 21 from top to bottom on the central shaft of the screw pusher near the outer wall of the central shaft. The upper end surface of the high-pressure water passage 21 is provided with an annular water tank 23 communicating with the upper end surfaces of all high-pressure water passages. , the width of the annular water tank 23 is equal to the diameter of the high-pressure water channel 21, and the cross-sectional shape of the annular water tank is arc-shaped or square. The static part of the transmission device 7 is provided with a high-pressure water inlet channel connected to the annular water tank. The high-pressure water inlet 18 is also located on the static part of the transmission device 7. The function of the annular water tank 23 is to ensure that the high-pressure water can also flow from the The high-pressure water inlet channel enters the high-pressure water channel 21 of the screw propeller. Three-way high-pressure nozzles 22 are installed between every two layers of spiral blades 24 on the outer wall of the central axis of the screw pusher. The position of the three-way high-pressure nozzles 22 can be adjusted according to the position and spacing of the spiral blades. The angle α between the direction of the nozzle and the axial direction of the central axis of the screw propeller is 35°~55°, 90°, 125°~145° respectively, and the diameters of the three nozzles are φ2mm~φ5mm.

In the transmission device 7, a high-pressure dynamic sealing device is installed between the static part and the moving part, and the high-pressure dynamic sealing device is a tooth-shaped combination seal for the rotating shaft, filled with PTEE+NBR/FKM; a high-pressure dynamic sealing device is installed between the moving part and the moving part. Static sealing device, high pressure static sealing device is copper or brass gasket. The diameter of the high-pressure water inlet 18 is φ5mm˜φ20mm.

The self-cleaning working process of centrifuge of the present invention is as follows:

(1) When cleaning the centrifuge, connect high-pressure water to the high-pressure water inlet.

(2) High-pressure water is sprayed from the three-way high-pressure nozzle through each high-pressure water channel.

(3) The three-way high-pressure nozzle cleans the lower surface of the blade above the nozzle, the inner surface of the drum, and the upper surface of the lower blade respectively.

(4) Start the motor to rotate the screw propeller of the centrifuge, and the rotation speed is controlled at 150RPM~500RPM, so that the high-pressure water jetted from the three-way nozzle can be sprayed on the entire screw propeller and drum. The rotation of the screw propeller can make the water flow form a certain angle with the surface to be sprayed, so that the substances attached to the surface of the substrate can be cleaned more easily.

(5) The cleaned adherent substances are discharged from the slag outlet of the equipment along the inner wall of the drum.

Example 2:

The basic structure of the vertical spiral liquid-solid centrifuge with automatic cleaning function in the present embodiment is the same as in Example 1, and the specific working parameters of the centrifuge are as follows:

Device parameters

1. V-belt and V-belt pulley are used between the driving wheel and the driven wheel of the motor;

2. The planetary gear differential adopts a 4-stage planetary gear set, and the transmission ratio is 1:256;

3. The cone angle of the cone section of the drum is 4°;

4. The length ratio of drum column section and cone section is 1.5:1;

5. The hollow part of the screw propeller accounts for 1/3 of the overall blade area;

6. The distance between the propeller blade and the inner wall of the drum is 1mm.

7. The diameter of the high-pressure water channel inside the screw pusher is φ5mm, the number of high-pressure water channels is 4, and the annular water tank adopts an arc shape;

8. The α angles of the three-way high-pressure nozzles are 45°, 90°, and 135° respectively, and the diameters of the three nozzles are φ3.5.

9. The diameter of the high-pressure water inlet on the transmission device is φ10mm.

Operation settings

Control screw propeller speed 350RPM.

actual effect

The adoption of the automatic cleaning function of the centrifuge in the present invention can save about 85% of the time compared with the cleaning drum and screw pusher of the original disassembly equipment.

Claims (10)

1. A vertical spiral liquid-solid centrifuge with automatic cleaning function, comprising a shell, a feed pipe, a main motor, an auxiliary motor, a transmission device, a multi-stage planetary gear differential, a screw pusher and a drum, The screw pusher is located in the drum. The screw pusher includes a central shaft and a helical blade. The helical blade is fixedly connected with the central shaft. The high-pressure water channel, the upper end of the high-pressure water channel is provided with an annular water tank, the static part of the transmission device is provided with a high-pressure water inlet channel connected with the annular water tank, and a high-pressure nozzle is installed between every two layers of spiral blades on the outer wall of the central shaft. The nozzle is connected with the high-pressure water channel; a high-pressure dynamic sealing device is installed between the static part of the transmission device and its moving part, and a high-pressure static sealing device is installed between the moving part of the transmission device and its moving part. 2. A vertical spiral liquid-solid centrifuge with automatic cleaning function according to claim 1, characterized in that: the number of the high-pressure water channels is 2-4. 3. A vertical spiral liquid-solid centrifuge with automatic cleaning function according to claim 1, characterized in that: the high-pressure nozzle is a three-way high-pressure nozzle, and the directions of the three nozzles are aligned with the axial direction of the central axis. The included angles are 35°～55°, 90° and 125°～145° respectively, and the diameters of the three nozzles are φ2mm～φ5mm. 4. A vertical spiral liquid-solid centrifuge with automatic cleaning function according to claim 1, characterized in that: the width of the annular water tank is slightly wider than the diameter of the high-pressure water channel. 5. A vertical spiral liquid-solid centrifuge with automatic cleaning function according to any one of claims 1-4, characterized in that: the cross-sectional shape of the annular water tank is arc-shaped or square. 6. A vertical spiral liquid-solid centrifuge with automatic cleaning function according to any one of claims 1-4, characterized in that: the diameter of the high-pressure water inlet channel is φ3mm˜φ15mm. 7. A vertical spiral liquid-solid centrifuge with automatic cleaning function according to any one of claims 1-4, characterized in that: the high-pressure dynamic sealing device is a tooth-shaped combined seal for the rotating shaft, filled with PTEE+ NBR/FKM; high-pressure static seals are copper or brass gaskets. 8. A vertical spiral liquid-solid centrifuge with automatic cleaning function according to any one of claims 1-4, characterized in that: the driving wheel of the main motor drives the main motor from The driving wheel, the driven wheel of the main motor is coaxially connected with the outer ring gear of the multi-stage planetary gear differential, and the outer ring gear of the multi-stage planetary gear differential is coaxially connected with the drum; the driving wheel of the auxiliary motor is connected through a V-belt Or the synchronous belt drives the driven wheel of the auxiliary motor, the driven wheel of the auxiliary motor is coaxially connected with the input shaft of the multistage planetary gear differential, and the output shaft of the multistage planetary gear differential is coaxially connected with the screw pusher. 9. A vertical screw liquid-solid centrifuge with automatic cleaning function according to any one of claims 1-4, characterized in that: the main motor and the auxiliary motor are respectively controlled by two frequency converters, and the screw pushes the material The differential speed between the device and the drum is 0~10RPM. 10. A vertical spiral liquid-solid centrifuge with automatic cleaning function according to any one of claims 1-4, characterized in that: the spiral blade adopts a hollow structure, that is, the spiral blade is evenly distributed along its circumference. In addition, a plurality of openings are arranged at intervals, and the total area of the openings accounts for 1/4 to 1/2 of the total area of the entire spiral blade.