Centrifugal sand pump

Abstract

The utility model discloses a centrifugal sand pump which comprises a base, a pump shell is fixed to the outer wall of the top face of the base, a transmission shaft is rotationally connected to the inner wall of the pump shell, a plurality of impellers are connected to the outer wall of the transmission shaft, an avoiding cavity is formed in the side, located on the largest impeller, of the interior of the pump shell, and a motor is fixed to the outer wall of the top face of the base. A motor output shaft is connected with a connecting box, and a moving block is fixed to the end, away from the pump shell, of the transmission shaft. By arranging the connecting box, the transmission shaft, the avoiding cavity, the moving block, the electromagnets, the reset spring, the sliding groove and the limiting block, when the impeller is clamped, the output shaft of the motor is clamped, the current of the stator winding of the motor is increased, the attraction force between the two electromagnets is increased, and the moving block moves towards one end of the connecting box; the impeller is driven to move towards the interior of the avoiding cavity, at the moment, an impeller runner is enlarged, the impeller can rotate smoothly, the manual cleaning frequency is reduced, and the working efficiency is improved.

Description

Technical Field

[0001] The utility model relates to the technical field of sand pumps, in particular to a centrifugal sand pump. Background Art

[0002] Sand pump is a kind of centrifugal mud pump, which is used to transport suspension containing sand, slag, etc. Sand pump is an important supporting equipment in drilling fluid solid control system, which provides drilling fluid with a certain displacement and pressure for cyclone desander, desilter and cleaner, ensuring that the hydraulic cyclone solid control equipment has the best desanding and desilting effect.

[0003] The centrifugal sand pump is mainly composed of pump casing, impeller, pump shaft, wear-resistant disc, sealing device, bearing seat, bearing, coupling, motor, base and other parts. Its working principle is that when the motor drives the impeller to rotate at high speed, the liquid in the impeller also rotates. Due to the action of centrifugal force, the liquid rushes out of the inlet pipe along the tangential direction of the impeller's circular rotation. After the liquid is discharged, a vacuum is formed near the rotating shaft in the pump casing. Under the action of external pressure, the liquid in the liquid inlet pipe is pressed into the pump to fill the vacuum. Due to the presence of gravel and slag of different sizes in the drilling fluid, during the rotation of the impeller, gravel may accumulate and block the flow channel of the impeller, causing the impeller to fail to operate normally and requiring manual disassembly and cleaning. Utility Model Content

[0004] The utility model aims to solve the shortcomings in the prior art and proposes a centrifugal sand pump.

[0005] In order to achieve the above purpose, the utility model adopts the following technical solutions:

[0006] A centrifugal sand pump comprises a base, a pump casing is fixed to the outer wall of the top surface of the base, a transmission shaft is rotatably connected to the inner wall of the pump casing, a plurality of impellers are connected to the outer wall of the transmission shaft, the plurality of impellers are arranged in a stepped linear manner, an avoidance cavity is provided on the side of the largest impeller inside the pump casing, a motor is fixed to the outer wall of the top surface of the base, a connecting box is connected to the output shaft of the motor, a moving block is fixed to one end of the transmission shaft away from the pump casing, an electromagnet is fixed to the side opposite to the connecting box and the moving block, the two electromagnets are magnetically matched, the electromagnet is electrically connected to the stator of the motor, a return spring is fixed to the outer wall of one side of the moving block, and the other end of the return spring is connected to the inner wall of the connecting box.

[0007] As a further solution of the utility model: a mechanical seal assembly is provided at the connection between the transmission shaft and the pump casing.

[0008] As a further solution of the utility model: the outer wall of the pump housing is provided with a liquid outlet pipe and a liquid inlet pipe, and the liquid outlet pipe and the liquid inlet pipe are staggered at 90 degrees.

[0009] As a further solution of the utility model: sliding grooves are provided on the inner walls on both sides of the connection box, and limiting blocks are fixed on the outer walls on both sides of the moving block.

[0010] As a further solution of the utility model: the inner wall of the limit block is rotatably connected with a plurality of rollers, and the rollers are in contact with and cooperate with the inner wall of the slide groove.

[0011] As a further solution of the utility model: the plurality of rollers are arranged in equidistant straight lines.

[0012] As a further solution of the utility model: a rack 1 is fixed to the outer walls on both sides of the connection box, and a rack 2 is connected to one end of the transmission shaft.

[0013] As a further solution of the utility model: the outer walls on both sides of the moving block are rotatably connected with gears, and the gears are in transmission meshing with rack 1 and rack 2.

[0014] Compared with the prior art, the utility model provides a centrifugal sand pump having the following

[0015] Beneficial effects:

[0016] 1. The utility model is provided with a connecting box, a transmission shaft, an avoidance chamber, a moving block, an electromagnet, a reset spring, a slide groove and a limit block. When the impeller is stuck, the output shaft of the motor is stuck. At this time, the current of the stator winding of the motor increases, so that the suction force between the two electromagnets electrically connected to the stator increases, and the moving block moves along the slide groove toward one end of the connecting box, and drives the impeller to move into the avoidance chamber through the transmission shaft. Since the multiple impellers are stepped, the flow channel between the impeller and the pump casing is enlarged, so that the impeller can rotate smoothly. At the same time, the flow of liquid will gradually take away the particles blocking the flow channel, clean the flow channel, reduce the number of manual cleaning times, and improve work efficiency.

[0017] 2. The utility model, by providing a roller, changes the sliding friction between the limit block and the slide groove into rolling friction, reduces the friction between the limit block and the slide groove, and facilitates the movement of the limit block.

[0018] 3. The utility model, by providing rack 1, rack 2 and gears, converts one-stage displacement of the impeller into two-stage synchronous displacement, thereby accelerating the speed of the impeller moving into the avoidance chamber.

[0019] The parts not involved in the device are the same as those in the prior art or can be implemented by using the prior art. The utility model has a simple structure and is easy to operate. BRIEF DESCRIPTION OF THE DRAWINGS

[0020] Figure 1 This is a schematic diagram of the overall structure of a centrifugal sand pump proposed by the utility model;

[0021] Figure 2 This is a schematic diagram of the internal structure of a centrifugal sand pump proposed by the utility model;

[0022] Figure 3 This is a schematic diagram of the connection structure between a centrifugal sand pump connection box and a moving block proposed by the utility model;

[0023] Figure 4 The utility model is a schematic diagram of the internal structure of a centrifugal sand pump connection box.

[0024] In the figure: 1. base; 2. pump casing; 3. liquid outlet pipe; 4. liquid inlet pipe; 5. motor; 6. connecting box; 7. transmission shaft; 8. impeller; 9. avoidance chamber; 10. moving block; 11. electromagnet; 12. gear; 13. rack 1; 14. rack 2; 15. reset spring; 16. slide groove; 17. limit block; 18. roller; 19. mechanical seal assembly. DETAILED DESCRIPTION

[0025] The technical solutions in the embodiments of the present invention will be described clearly and completely below in conjunction with the drawings in the embodiments of the present invention. Obviously, the described embodiments are only part of the embodiments of the present invention, rather than all of the embodiments.

[0026] In the description of the present invention, it should be understood that the terms "upper", "lower", "front", "back", "left", "right", "top", "bottom", "inside", "outside", etc., indicating directions or positional relationships, are based on the directions 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 direction, be constructed and operated in a specific direction, and therefore should not be understood as a limitation on the present invention.

[0027] Example 1

[0028] A centrifugal sand pump, such as Figures 1 to 3As shown, it includes a base 1, a pump casing 2 is fixed to the outer wall of the top surface of the base 1, a transmission shaft 7 is rotatably connected to the inner wall of the pump casing 2, a mechanical seal assembly 19 is provided at the connection between the transmission shaft 7 and the pump casing 2, and the mechanical seal assembly 19 is a commonly used structure in the field, so it is not described here. A plurality of impellers 8 are connected to the outer wall of the transmission shaft 7, and the plurality of impellers 8 are arranged in a stepped straight line. An avoidance cavity 9 is provided on the side of the largest impeller 8 inside the pump casing 2, a liquid outlet pipe 3 and a liquid inlet pipe 4 are provided on the outer wall of the pump casing 2, and the liquid outlet pipe 3 and the liquid inlet pipe 4 are staggered at 90 degrees, a motor 5 is fixed to the outer wall of the top surface of the base 1, and the output shaft of the motor 5 is connected to A connecting box 6, a moving block 10 is fixed at one end of the transmission shaft 7 away from the pump housing 2, and limit blocks 17 are fixed to the outer walls on both sides of the moving block 10. The inner walls of the limit blocks 17 are rotatably connected to multiple rollers 18, and the multiple rollers 18 are arranged in equidistant straight lines. Slide grooves 16 are provided on the inner walls on both sides of the connecting box 6, and the rollers 18 are in contact and cooperate with the inner walls of the slide grooves 16. An electromagnet 11 is fixed on the opposite side of the connecting box 6 and the moving block 10, and the two electromagnets 11 are magnetically attracted to cooperate, and the electromagnet 11 is electrically connected to the stator of the motor 5. A return spring 15 is fixed to the outer wall of one side of the moving block 10, and the other end of the return spring 15 is connected to the inner wall of the connecting box 6.

[0029] When the impeller 8 is stuck, the output shaft of the motor 5 is stuck. At this time, the stator winding current of the motor 5 increases, which increases the suction force between the two electromagnets 11 electrically connected to the stator, causing the moving block 10 to move along the slide groove 16 to one end of the connecting box 6. The roller 18 changes the sliding friction between the limit block 17 and the slide groove 16 into rolling friction, the friction force becomes smaller, the reset spring 15 is compressed, and the impeller 8 is driven to move into the avoidance chamber 9 through the transmission shaft 7. Since the multiple impellers 8 are stepped, the flow channel between the impeller 8 and the pump casing 2 becomes larger, so that the impeller 8 can rotate smoothly. At the same time, the flow of liquid will gradually take away the particles blocking the flow channel and clear the flow channel. When the flow channel is cleaned, the load on the output shaft of the motor 5 is reduced, the suction force between the two electromagnets 11 becomes smaller, and the reset spring 15 pushes the moving block 10 to reset, so that the impeller 8 is reset.

[0030] By setting the connecting box 6, the transmission shaft 7, the avoidance chamber 9, the moving block 10, the electromagnet 11, the reset spring 15, the slide groove 16 and the limit block 17, when the impeller 8 is stuck, the output shaft of the motor 5 is stuck, and the stator winding current of the motor 5 increases, so that the suction force between the two electromagnets 11 electrically connected to the stator increases, so that the moving block 10 moves along the slide groove 16 toward one end of the connecting box 6, and drives the impeller 8 to move into the avoidance chamber 9 through the transmission shaft 7. Since the multiple impellers 8 are stepped, the flow channel between the impeller 8 and the pump casing 2 becomes larger, so that the impeller 8 can rotate smoothly. At the same time, the flow of liquid will gradually take away the particles blocking the flow channel, clean the flow channel, reduce the number of manual cleaning times, and improve work efficiency.

[0031] By providing the roller 18 , the sliding friction between the limit block 17 and the slide groove 16 is changed into rolling friction, thereby reducing the friction force between the limit block 17 and the slide groove 16 and facilitating the movement of the limit block 17 .

[0032] Example 2

[0033] A centrifugal sand pump, based on Example 1, this embodiment makes the following improvements, such as Figure 4 As shown, rack 13 is fixed to the outer walls on both sides of the connection box 6, rack 2 14 is connected to one end of the transmission shaft 7, and gears 12 are rotatably connected to the outer walls on both sides of the moving block 10, and the gears 12 are in transmission meshing engagement with rack 1 13 and rack 2 14.

[0034] When the moving block 10 moves, the relative movement between the rack 13 and the moving block 10 drives the gear 12 to rotate, and through the transmission engagement between the gear 12 and the rack 2 14, the transmission shaft 7 and the moving block 10 are driven to move in the same direction, and the displacement of the impeller 8 into the avoidance chamber 9 is converted into two synchronous displacements, thereby accelerating the speed of the impeller 8 to move into the avoidance chamber 9.

[0035] By providing the rack 13 , the rack 2 14 and the gear 12 , the one-stage displacement of the impeller 8 into the avoidance chamber 9 is converted into two-stage synchronous displacements, thereby accelerating the speed of the impeller 8 moving into the avoidance chamber 9 .

[0036] Working principle: When the impeller 8 is stuck, the output shaft of the motor 5 is stuck. At this time, the stator winding current of the motor 5 increases, which increases the suction force between the two electromagnets 11 electrically connected to the stator, causing the moving block 10 to move along the slide groove 16 toward one end of the connection box 6. The roller 18 changes the sliding friction between the limit block 17 and the slide groove 16 into rolling friction, the friction force becomes smaller, and the reset spring 15 is compressed. At the same time, the relative movement between the rack 13 and the moving block 10 drives the gear 12 to rotate, and the gear 12 and the rack 2 14 are connected. The transmission meshes, driving the transmission shaft 7 and the moving block 10 to move in the same direction, and driving the impeller 8 to move into the avoidance chamber 9 through the transmission shaft 7. Since the multiple impellers 8 are stepped, the flow channel between the impeller 8 and the pump housing 2 is enlarged, so that the impeller 8 can rotate smoothly. At the same time, the flow of liquid will gradually take away the particles blocking the flow channel and clean the flow channel. When the flow channel is cleaned, the load on the output shaft of the motor 5 is reduced, the suction force between the two electromagnets 11 becomes smaller, and the reset spring 15 pushes the moving block 10 to reset, so that the impeller 8 is reset.

[0037] The above description is only a preferred specific implementation manner of the present invention, but the protection scope of the present invention is not limited thereto. Any technician familiar with the technical field can make equivalent replacements or changes within the technical scope disclosed by the present invention according to the technical scheme and the utility model concept of the present invention, which should be covered by the protection scope of the present invention.

Claims

1. A centrifugal sand pump, comprising a base (1), characterized in that: A pump casing (2) is fixed to the outer wall of the top surface of the base (1); a transmission shaft (7) is rotatably connected to the inner wall of the pump casing (2); a plurality of impellers (8) are connected to the outer wall of the transmission shaft (7); the plurality of impellers (8) are arranged linearly in a stepped manner; an avoidance chamber (9) is provided inside the pump casing (2) on the side of the largest impeller (8); a motor (5) is fixed to the outer wall of the top surface of the base (1); the output shaft of the motor (5) is connected to a connecting box (6); a moving block (10) is fixed to one end of the transmission shaft (7) away from the pump casing (2); an electromagnet (11) is fixed to the opposite side of the connecting box (6) and the moving block (10); the two electromagnets (11) are magnetically matched; the electromagnet (11) is electrically connected to the stator of the motor (5); a return spring (15) is fixed to the outer wall of one side of the moving block (10); the other end of the return spring (15) is connected to the inner wall of the connecting box (6).

2. A centrifugal sand pump according to claim 1, characterized in that: A mechanical seal assembly (19) is provided at the connection between the transmission shaft (7) and the pump housing (2).

3. A centrifugal sand pump according to claim 1, characterized in that: The outer wall of the pump housing (2) is provided with a liquid outlet pipe (3) and a liquid inlet pipe (4), and the liquid outlet pipe (3) and the liquid inlet pipe (4) are arranged in a staggered manner at 90 degrees.

4. A centrifugal sand pump according to claim 1, characterized in that: Slide grooves (16) are provided on both inner walls of the connection box (6), and limit blocks (17) are fixed on both outer walls of the moving block (10).

5. A centrifugal sand pump according to claim 4, characterized in that: The inner wall of the limit block (17) is rotatably connected to a plurality of rollers (18), and the rollers (18) are in contact and cooperation with the inner wall of the slide groove (16).

6. A centrifugal sand pump according to claim 5, characterized in that: The plurality of rollers (18) are arranged in a straight line at equal distances.

7. A centrifugal sand pump according to claim 1, characterized in that: Rack 1 (13) is fixed to the outer walls of both sides of the connection box (6), and rack 2 (14) is connected to one end of the transmission shaft (7).

8. A centrifugal sand pump according to claim 1, characterized in that: The outer walls on both sides of the moving block (10) are rotatably connected with gears (12), and the gears (12) are in transmission meshing engagement with rack one (13) and rack two (14).

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