Horizontal screw centrifuge with oil seal protection labyrinth

Abstract

The utility model discloses a horizontal screw centrifuge with an oil seal protection labyrinth, which comprises a housing, a rotary drum rotatably connected in the housing, a screw propeller rotatably connected in the rotary drum, a first support main shaft fixed at the side end of a taper pipe of the rotary drum, and a support rotating shaft fixed at the side end of a taper pipe of the screw propeller. The supporting rotating shaft and the first supporting main shaft are provided with first bearings, a first circular ring plate is fixed to a taper pipe of the spiral propeller, a labyrinth ferrule is fixed to the first circular ring plate, a ring-shaped groove is formed in the labyrinth ferrule, a circular ring block matched with the ring-shaped groove is fixed to the first supporting main shaft, and a gap is reserved between the circular ring block and the ring-shaped groove. An oil seal seat is fixed on the first supporting main shaft; and an oil seal matched with the outer contour surface of the supporting rotating shaft is mounted on the oil seal seat. The oil seal can be prevented from being damaged by solid-phase objects, and the device is worthy of application and popularization.

Description

Technical Field

[0001] The utility model relates to a centrifuge, in particular to a horizontal centrifuge, and more particularly to a horizontal screw centrifuge with an oil seal protection labyrinth. Background Art

[0002] Horizontal spiral sedimentation centrifuge is referred to as horizontal spiral centrifuge. It is a kind of efficient centrifugal separation equipment. The working principle of the centrifuge is as follows: the drum and the screw propeller rotate at high speed in the same direction with a certain differential speed. The material is continuously introduced into the inner cylinder of the screw propeller from the feed pipe, and enters the drum after acceleration. Under the action of the centrifugal field, the heavier solid phase is deposited on the drum wall to form a sediment layer. The screw propeller continuously pushes the deposited solid phase to the cone end of the drum and discharges it out of the machine through the slag discharge port. The lighter liquid phase forms an inner liquid ring, which continuously overflows the drum from the overflow port at the large end of the drum and is discharged out of the machine through the liquid discharge port.

[0003] In the traditional horizontal screw centrifuge, when the solid phase is pushed to the cone section outlet by the screw propeller, due to the gap between the cone section spiral head and the small end spindle, some of the solid phase will enter the oil seal seat between the cone section spiral head and the small end spindle, thereby damaging the oil seal. The oil seal needs to be replaced frequently, which not only causes troublesome replacement but also causes downtime losses.

[0004] Chinese utility model patent CN 214183590 U discloses a high-dryness horizontal screw centrifuge, which includes a cover shell, a drum is rotatably connected in the cover shell, and a spiral propeller with a speed difference with the drum is rotatably connected in the drum; the drum and the spiral propeller are both driven to rotate by a motor, the drum includes a pipe fitting and a connected second conical tube, and the taper direction of the pipe fitting is consistent with that of the second conical tube; the spiral propeller includes a cylinder, a first spiral propulsion blade and a second spiral propulsion blade connected with the first spiral propulsion blade are 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, and the outer contour of the second spiral propulsion blade is conical and consistent with the taper of the second conical tube; a cavity located between the first spiral propulsion blade and the second spiral propulsion blade is arranged on the cylinder, a material inlet is arranged on the cavity, a material inlet pipe is arranged in the cylinder, and a feed outlet located at the cavity is arranged at the inner end of the material inlet pipe; a liquid outlet is arranged on the first spiral propulsion blade side of the left end of the drum, and a slag outlet is arranged on the second spiral propulsion blade side of the right end of the drum. The oil seal on the centrifuge has no additional special protection, which makes it easy for solid matter to flow into the oil seal through the gap. In a high-speed rotation environment, the oil seal will wear quickly and be damaged, resulting in the trouble of frequent replacement of the oil seal. Utility Model Content

[0005] The utility model aims to solve the shortcomings of the above-mentioned prior art and provide a horizontal screw centrifuge with an oil seal protection labyrinth that can perform labyrinth protection on the oil seal to prevent solid phase from damaging the oil seal, thereby meeting the requirements of long service life of the oil seal and no need for frequent shutdown for replacement.

[0006] The utility model adopts a technical solution to solve the technical problem: the horizontal screw centrifuge with an oil seal protection labyrinth comprises a cover shell, a drum is rotatably connected inside the cover shell, a screw propeller with a speed difference with the drum is rotatably connected inside the drum, a supporting main shaft is fixed to the side end of the cone tube of the drum, a supporting rotating shaft is fixed to the side end of the cone tube of the screw propeller, a first bearing is installed on the supporting rotating shaft and the supporting main shaft, a first annular plate is fixed on the cone tube of the screw propeller, a labyrinth ring is fixed on the first annular plate, a ring-shaped groove is opened on the labyrinth ring, a ring block matched with the ring-shaped groove is fixed on the supporting main shaft, a gap is left between the ring block and the ring-shaped groove, an oil seal seat is fixed on the supporting main shaft, an oil seal matched with the outer contour surface of the supporting rotating shaft is installed on the oil seal seat, and the first bearing is located on the outside of the oil seal. The function of the labyrinth ring, the annular groove and the circular ring block here is to prevent solid matter from entering the gap between the cone section of the screw propeller and the supporting main shaft, thereby preventing a small amount of solid matter from entering the oil seal seat and damaging the oil seal, and also protecting the first bearing from being contaminated by solid matter and increasing friction loss; the annular groove here can be in the form of a square, triangle or polygon, thereby increasing the passage distance of the blocked solid matter, thereby achieving a better labyrinth-like blocking of the solid matter; the first bearing here can support one end of the screw propeller and enable the screw propeller and the drum to rotate relative to each other.

[0007] Further improvement, a group of first retaining rings are fixed on the outer contour surface of the circular ring block and are arranged at intervals along the length direction of the circular ring block. Each first retaining ring is arranged at an acute angle with the outer contour of the circular ring block, and the outer contour of each first retaining ring is matched with the outer contour surface of the ring-shaped groove. The function of the first retaining ring here is to form a complex maze form, so as to block the solid phase flowing through the gap layer by layer, with good blocking effect, and the solid phase will not flow into the oil seal; the function of each first retaining ring being arranged at an acute angle with the outer contour of the circular ring block here is to block the solid phase at an angle, and the first retaining ring can have a stronger blocking force.

[0008] Further improvement, a group of second retaining rings are fixed on the inner contour surface of the circular ring block and are arranged at intervals along the length direction of the circular ring block, and each second retaining ring is arranged at an acute angle with the inner and outer contours of the circular ring block. The role of the second retaining rings here is to further form a layered maze setting to block the solid phase; the role of the second retaining rings here being arranged at an acute angle with the inner and outer contours of the circular ring block is to be able to block the solid phase at an angle, and the second retaining rings can have a stronger force.

[0009] Further improvement, an annular pier located outside the oil seal is fixed on the supporting shaft, a sealing ring matched with the end face of the oil seal seat is installed on the annular pier, and the sealing ring is located between the first bearing and the oil seal. Here, the annular pier and the sealing ring play a secondary sealing role and can protect the first bearing from solid phases.

[0010] The beneficial effects of the utility model are:

[0011] 1). The labyrinth ring, annular groove and annular block can block a small amount of solid matter that enters the gap between the screw propeller cone section and the supporting main shaft, preventing the solid matter from entering the oil seal seat and damaging the oil seal;

[0012] 2). Through each first retaining ring and each second retaining ring, the complexity of the maze can be further increased, thereby achieving a better effect of preventing solid matter from entering the oil seal seat;

[0013] 3). The annular pier and the sealing ring can achieve a secondary sealing effect, which can further protect the first bearing from solid phase objects, thereby preventing the solid phase objects from hitting the first bearing and causing damage to the first bearing. BRIEF DESCRIPTION OF THE DRAWINGS

[0014] Figure 1 It is a structural schematic diagram of the utility model;

[0015] Figure 2 for Figure 1 A local enlarged view of area A;

[0016] Figure 3 It is a structural schematic diagram of the circular ring block area in the utility model;

[0017] Figure 4 It is a structural schematic diagram of the oil seal area in the utility model;

[0018] Figure 5 It is a three-dimensional diagram of the circular ring block area in the utility model.

[0019] Explanation of the reference numerals: cover shell 1, drum 2, slag outlet 2-1, screw propeller 3, first annular plate 3-1, labyrinth ring 3-2, annular groove 3-2a, supporting main shaft 4, annular block 4-1, first retaining ring 4-2, second retaining ring 4-3, supporting rotating shaft 5, annular pier 5-1, first bearing 6, oil seal seat 7, oil seal 8, sealing ring 9, bearing seat 10, solid phase 11, liquid phase 12. DETAILED DESCRIPTION

[0020] The utility model is further described below in conjunction with the accompanying drawings:

[0021] Referring to the accompanying drawings: this horizontal screw centrifuge with an oil seal protection labyrinth includes a cover shell 1, a drum 2 is rotatably connected inside the cover shell 1, a screw propeller 3 with a speed difference with the drum 2 is rotatably connected inside the drum 2, a supporting spindle 4 is fixed to the side end of the tapered tube of the drum 2, a supporting shaft 5 is fixed to the side end of the tapered tube of the screw propeller 3, a first bearing 6 is installed on the supporting shaft 5 and the supporting spindle 4, a first annular plate 3-1 is fixed on the tapered tube of the screw propeller 3, a labyrinth ring 3-2 is fixed on the first annular plate 3-1, a ring groove 3-2a is opened on the labyrinth ring 3-2, a ring block 4-1 matched with the ring groove 3-2a is fixed on the supporting spindle 4, a gap is left between the ring block 4-1 and the ring groove 3-2a, an oil seal seat 7 is fixed on the supporting spindle 4, an oil seal 8 matched with the outer contour surface of the supporting spindle 5 is installed on the oil seal seat 7, and the first bearing 6 is located on the outside of the oil seal 8.

[0022] A group of first retaining rings 4-2 are fixed on the outer contour surface of the circular ring block 4-1 and are arranged at intervals along the length direction of the circular ring block 4-1. Each first retaining ring 4-2 is arranged at an acute angle to the outer contour of the circular ring block 4-1, and the outer contour of each first retaining ring 4-2 is gap-matched with the outer contour surface of the ring-shaped groove 3-2a.

[0023] A group of second retaining rings 4-3 are fixed on the inner contour surface of the circular ring block 4-1 and are arranged at intervals along the length direction of the circular ring block 4-1. Each second retaining ring 4-3 is arranged at an acute angle to the inner and outer contours of the circular ring block 4-1.

[0024] An annular buttress 5 - 1 located outside the oil seal 8 is fixed on the supporting shaft 5 , and a sealing ring 9 matched with the end surface of the oil seal seat 7 is installed on the annular buttress 5 - 1 . The sealing ring 9 is located between the first bearing 6 and the oil seal 8 .

[0025] The working principle of the utility model is as follows: when the horizontal screw centrifuge is turned on, the drum 2 and the screw propeller 3 rotate at high speed in the same direction with a certain differential speed, and the material is continuously introduced into the inner cylinder of the screw propeller 3 from the feed pipe, and enters the drum 2 after acceleration. Under the action of the strong centrifugal force field, 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 11 to the conical end of the drum 2 and discharges it out of the machine through the slag discharge port. Since the drum 2 and the screw propeller 3 are in a state of relative motion, a gap will be left between the supporting main shaft 4 and the conical end of the screw propeller 3. In the process of a large amount of solid phase 11 being thrown out, a small amount of solid phase will flow through the gap to the oil seal seat 7, thereby To destroy the oil seal 8 and prevent the solid matter 11 from entering the oil seal seat 7, the annular block 4-1 is matched with the annular groove 3-2a, and a maze of several first retaining rings 4-2 and several second retaining rings 4-3 are arranged on the annular block 4-1, so that if the solid matter wants to flow into the oil seal seat 7, it must be bent layer by layer, first pass through each first retaining ring 4-2, then bend downward, and then pass through each second retaining ring 4-3 before it can flow into the oil seal seat 7. Since the solid matter 11 flows in through the gap in a small amount and is gradually blocked by the annular groove 3-2a, the solid matter 11 cannot pass through, thereby being able to well protect the oil seal 8 and worthy of popularization and application.

[0026] Although the present invention has been shown and described with reference to the 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 horizontal screw centrifuge with an oil seal protection labyrinth, comprising a housing (1), a drum (2) rotatably connected inside the housing (1), a screw propeller (3) rotatably connected inside the drum (2) and having a speed difference with the drum (2), wherein: A supporting spindle (4) is fixed to the side end of the conical tube of the rotating drum (2), a supporting rotating shaft (5) is fixed to the side end of the conical tube of the screw propeller (3), a first bearing (6) is installed on the supporting rotating shaft (5) and the supporting spindle (4), a first annular plate (3-1) is fixed to the conical tube of the screw propeller (3), a labyrinth ring (3-2) is fixed to the first annular plate (3-1), a ring-shaped groove (3-2a) is provided on the labyrinth ring (3-2), a ring block (4-1) matched with the ring-shaped groove (3-2a) is fixed to the supporting spindle (4), a gap is left between the ring block (4-1) and the ring-shaped groove (3-2a), an oil seal seat (7) is fixed to the supporting spindle (4), an oil seal (8) matched with the outer contour surface of the supporting rotating shaft (5) is installed on the oil seal seat (7), and the first bearing (6) is located on the outside of the oil seal (8).

2. A horizontal screw centrifuge with an oil seal protection labyrinth according to claim 1, characterized in that: A group of first retaining rings (4-2) are fixed on the outer contour surface of the circular ring block (4-1) and are arranged at intervals along the length direction of the circular ring block (4-1); each of the first retaining rings (4-2) is arranged at an acute angle to the outer contour of the circular ring block (4-1); and the outer contour of each of the first retaining rings (4-2) is clearance-matched with the outer contour surface of the ring-shaped groove (3-2a).

3. A horizontal screw centrifuge with an oil seal protection labyrinth according to claim 2, characterized in that: A group of second retaining rings (4-3) are fixed on the inner contour surface of the circular ring block (4-1) and are arranged at intervals along the length direction of the circular ring block (4-1). Each of the second retaining rings (4-3) is arranged at an acute angle to the inner and outer contours of the circular ring block (4-1).

4. A horizontal screw centrifuge with an oil seal protection labyrinth according to any one of claims 1 to 3, characterized in that: An annular buttress (5-1) located outside the oil seal (8) is fixed on the supporting shaft (5), a sealing ring (9) matched with the end surface of the oil seal seat (7) is installed on the annular buttress (5-1), and the sealing ring (9) is located between the first bearing (6) and the oil seal (8).

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