Self-balancing device of centrifugal pump

Abstract

The utility model relates to the technical field of centrifugal pumps, and discloses a centrifugal pump self-balancing device which comprises a water inlet seat, an inlet pressure tapping opening is formed in the upper end of the left side of the water inlet seat, an impeller is installed above the water inlet seat, and a water outlet seat is fixedly connected to the right side of the end, away from the water inlet seat, of the impeller. The self-balancing device, the water inlet seat, the inlet pressure tapping port and the water outlet seat are matched, the self-balancing device comprises the alloy inner ring, the bearing seat, the upper bearing, the thrust disc and the lower bearing, the upper bearing and the lower bearing are respectively provided with the corresponding water tanks, and the gap is formed between the upper water tank and the lower water tank, so that the self-balancing device is convenient to use. High-pressure liquid flows to the back face of the thrust disc through the gap to generate reverse thrust, when the axial force is increased, the gap is reduced, the back pressure is increased, and the reverse thrust is increased, so that the axial force is automatically balanced, residual tiny fluctuation is absorbed by the upper bearing and the lower bearing, the thrust disc can be dynamically adjusted along with changes of working conditions, and the effect of approximately complete balance is achieved.

Description

Technical Field

[0001] This utility model relates to the field of centrifugal pump technology, specifically to a centrifugal pump self-balancing device. Background Technology

[0002] A centrifugal pump is a pump that uses the centrifugal force generated by the rotation of an impeller to transport liquids. The impeller is the only component in bladed fluid machinery that transfers energy to the fluid, converting the mechanical energy of the prime mover into the kinetic and pressure energy of the fluid. The pump's flow rate, head, and efficiency are closely related to the shape, size, and surface roughness of the impeller. Common centrifugal pumps typically have a disc-shaped impeller structure connected to a motor, with multiple sets of arc-shaped impeller blades added to its surface, allowing it to drive the liquid inside the pump body to rotate centrifugally during rotation.

[0003] However, in existing centrifugal pumps, liquid flows in from the impeller inlet, is accelerated by rotation, and then discharged from the outlet. When the liquid pressure between the impeller rear cover plate (near the motor side) and the pump casing is higher than the pressure of the front cover plate (suction port side), a pressure difference is formed, generating an axial force pointing towards the suction port. This axial force is entirely borne by the thrust bearing. Long-term overload may cause the bearing to overheat, wear, or even burn out, resulting in bearing overload damage. At the same time, axial displacement will change the contact state of the sealing surface, leading to leakage or damage to the seals, causing mechanical seal failure, thus affecting the normal use of the centrifugal pump. Utility Model Content

[0004] To address the shortcomings of existing technologies, this utility model provides a centrifugal pump self-balancing device, which has the advantages of adding a self-balancing device to the centrifugal pump, realizing automatic axial force balancing, and ensuring the normal use of the centrifugal pump, thus solving the problems mentioned in the background art.

[0005] This utility model provides the following technical solution: a centrifugal pump self-balancing device, including an inlet seat, an inlet pressure tap on the upper left side of the inlet seat, an impeller mounted above the inlet seat, an outlet seat fixedly connected to the right side of the impeller away from the inlet seat, a self-balancing device located above the impeller on the upper end of the outlet seat, a pressure cap fixedly mounted on the upper end of the self-balancing device by fastening bolts, a mechanical seal provided on the inner side of the pressure cap, a bushing located inside the mechanical seal fitted on the inner wall of the pressure cap, a single diaphragm coupling fixedly mounted on the upper end of the bushing and located above the pressure cap, and a motor fixedly connected to the upper end of the single diaphragm coupling.

[0006] Preferably, the self-balancing device includes an alloy inner ring, a bearing housing, an upper bearing, a thrust disk, and a lower bearing. The outer wall of the alloy inner ring is sleeved with the inner wall of the upper bearing, and the outer wall of the upper bearing is sleeved with the inner wall of the bearing housing. The upper bearing and the bearing housing are connected by bolts. The thrust disk is disposed between the bearing housing and the upper bearing, and the lower bearing is located above the impeller.

[0007] Preferably, the upper end of the alloy inner ring is threadedly connected to the lower end of the fastening bolt, and the upper end of the fastening bolt is threadedly connected to the inner wall of the gland.

[0008] Preferably, the lower end face of the upper bearing and the upper end face of the lower bearing are respectively provided with water grooves, and the number of water grooves is eight.

[0009] Preferably, the impeller is fitted with a lower cover located below the motor. The inner wall of the right side of the lower cover is fixedly fitted with the outer wall of the water outlet seat. The upper end of the lower cover is threaded with a limit bolt. The lower cover is fixedly installed on the upper end of the water inlet seat by the limit bolt, and the lower end of the limit bolt extends into the interior of the upper end of the water inlet seat. The lower cover is connected to the lower bearing by bolts.

[0010] Preferably, a junction box is fixedly installed on the left side of the motor, and an upper flange located above the lower cover is fixedly installed on the lower end face of the motor, with connecting bolts evenly distributed on the upper flange.

[0011] Preferably, an upper cover located outside the single diaphragm coupling is movably mounted on the upper end of the lower cover via limiting bolts, and a lower flange located below the upper flange is fixedly mounted on the upper end of the upper cover. The lower flange is mounted on the lower end of the upper flange via connecting bolts.

[0012] Compared with the prior art, the present invention has the following beneficial effects:

[0013] 1. This utility model utilizes the cooperation between a self-balancing device, a water inlet seat, an inlet pressure tap, and a water outlet seat. The self-balancing device includes an alloy inner ring, a bearing seat, an upper bearing, a thrust plate, and a lower bearing. Corresponding water grooves are provided on the upper and lower bearings, and a gap is formed between the upper and lower water grooves. High-pressure liquid flows through the gap to the back of the thrust plate, generating a reverse thrust. When the axial force increases, the gap decreases, the back pressure increases, and the reverse thrust increases, thereby automatically balancing the axial force. Furthermore, any remaining minor fluctuations are absorbed by the upper and lower bearings. The thrust plate can dynamically adjust according to changes in working conditions, achieving an effect of near-perfect balance.

[0014] 2. This utility model ensures cooling effect by coordinating the upper bearing, lower bearing, and bearing housing, and by providing corresponding water groove structures on the upper and lower bearings respectively. Attached Figure Description

[0015] Figure 1 This is a schematic diagram of the structure of this utility model;

[0016] Figure 2 This is a side view of the upper bearing of this utility model;

[0017] Figure 3 This is a bottom view of the upper bearing of this utility model;

[0018] Figure 4 This is a top view of the lower bearing of this utility model;

[0019] Figure 5 This is a bottom view of the lower bearing of this utility model;

[0020] Figure 6 This is a schematic diagram of the bearing housing of this utility model;

[0021] Figure 7 This is a top view of the bearing housing of this utility model;

[0022] Figure 8 This is a side view of the thrust disc of this utility model.

[0023] In the diagram: 1. Inlet seat; 2. Inlet pressure tap; 3. Impeller; 4. Outlet seat; 5. Self-balancing device; 501. Alloy inner ring; 502. Bearing housing; 503. Upper bearing; 504. Thrust disc; 505. Lower bearing; 6. Fastening bolts; 7. Pressure cap; 8. Mechanical seal; 9. Shaft sleeve; 10. Single diaphragm coupling; 11. Motor; 12. Lower flange; 13. Connecting bolts; 14. Junction box; 15. Upper flange; 16. Lower cover; 17. Limit bolts; 18. Upper cover. Detailed Implementation

[0024] The technical solutions of the present utility model will be clearly and completely described below with reference to the accompanying drawings of the embodiments. Obviously, the described embodiments are only some embodiments of the present utility model, and not all embodiments. Based on the embodiments of the present utility model, all other embodiments obtained by those of ordinary skill in the art without creative effort are within the protection scope of the present utility model.

[0025] Please see Figure 1 , Figure 2 and Figure 7The centrifugal pump self-balancing device includes an inlet seat 1. An inlet pressure tap 2 is located at the upper left end of the inlet seat 1. An impeller 3 is mounted above the inlet seat 1. The rotation of the impeller 3 drives the fluid movement, thereby generating centrifugal force, which transports the medium to the self-balancing device 5. The medium flows through a water tank on the self-balancing device 5, passes through a cooling chamber, flows upwards into the mechanical seal 8, and then returns to the inlet pressure tap 2 through the hole on the inlet seat 1. This is the flow path. An outlet valve is fixedly connected to the right side of the impeller 3, away from the inlet seat 1. The water seat 4 and the outlet seat 4 are equipped with a self-balancing device 5 located above the impeller 3. The upper end of the self-balancing device 5 is fixedly installed with a pressure cover 7 by fastening bolts 6. The fastening bolts 6 are used to connect the self-balancing device 5 and the pressure cover 7. A mechanical seal 8 is provided inside the pressure cover 7. A bushing 9 located inside the mechanical seal 8 is sleeved on the inner wall of the pressure cover 7. A single diaphragm coupling 10 located above the pressure cover 7 is fixedly installed at the upper end of the bushing 9. A motor 11 is fixedly connected to the upper end of the single diaphragm coupling 10.

[0026] The self-balancing device 5 includes an alloy inner ring 501, a bearing housing 502, an upper bearing 503, a thrust disc 504, and a lower bearing 505. The bearing housing 502 is made of corrosion-resistant metal. The outer wall of the alloy inner ring 501 is sleeved with the inner wall of the upper bearing 503, and the outer wall of the upper bearing 503 is sleeved with the inner wall of the bearing housing 502. The upper bearing 503 and the bearing housing 502 are connected by bolts. The thrust disc 504 is located between the bearing housing 502 and the upper bearing 503. The thrust disc 504 is made of hard alloy material YG8. It offsets the axial force generated during pump operation through dynamic pressure balance. The lower bearing 505 is located above the impeller 3. High-pressure liquid flows through the gap to the back of the thrust disc 504, generating a reverse thrust. The remaining small fluctuations are absorbed by the thrust bearings, including the upper bearing 503 and the lower bearing 505. The thrust disc 504 can be dynamically adjusted according to changes in working conditions to achieve automatic axial force balance.

[0027] The upper end of the alloy inner ring 501 is threadedly connected to the lower end of the fastening bolt 6, and the upper end of the fastening bolt 6 is threadedly connected to the inner wall of the gland 7. The fastening bolt 6 is used to connect the alloy inner ring 501 and the gland 7.

[0028] Please see Figure 3 , Figure 4 and Figure 5 Water grooves are provided on the lower end face of the upper bearing 503 and the upper end face of the lower bearing 505, and there are eight water grooves in total. The upper bearing 503 and the lower bearing 505 are made of impregnated graphite, which has good thermal conductivity and wear resistance. The eight-groove structure design ensures the cooling effect.

[0029] The impeller 3 is externally sleeved with a lower cover 16 located below the motor 11. The inner wall of the right side of the lower cover 16 is fixedly sleeved with the outer wall of the water outlet seat 4. The upper end of the lower cover 16 is threaded with a limit bolt 17. The lower cover 16 is fixedly installed on the upper end of the water inlet seat 1 by the limit bolt 17. The limit bolt 17 is set to connect the lower cover 16 and the water inlet seat 1, and the lower end of the limit bolt 17 extends into the interior of the upper end of the water inlet seat 1. The lower cover 16 is connected to the lower bearing 505 by bolts. The lower bearing 505 and the lower cover 16 are bolted together.

[0030] Please see Figure 8 , Figure 6 and Figure 1 A junction box 14 is fixedly installed on the left side of the motor 11, and an upper flange 15 located above the lower cover 16 is fixedly installed on the lower end face of the motor 11. Connecting bolts 13 are evenly distributed on the upper flange 15.

[0031] The upper cover 18 located outside the single diaphragm coupling 10 is movably installed at the upper end of the lower cover 16 via a limiting bolt 17. The lower flange 12 located below the upper flange 15 is fixedly installed at the upper end of the upper cover 18. The lower flange 12 is installed at the lower end of the upper flange 15 via connecting bolts 13. The connecting bolts 13 are used to connect the lower flange 12 and the upper flange 15.

[0032] Working principle: During use, the rotation of impeller 3 drives the movement of fluid, thereby generating centrifugal force, which transports the medium to the self-balancing device 5. The medium flows through the water tank on the self-balancing device 5, passes through the cooling chamber, and then flows upward into the mechanical seal 8. It then returns to the inlet pressure tap 2 through the hole on the water inlet seat 1. This is the flow path. The high-pressure liquid flows through the gap to the back of the thrust plate 504, generating reverse thrust. The remaining small fluctuations are absorbed by the thrust bearings, including the upper bearing 503 and the lower bearing 505. The thrust plate 504 can dynamically adjust according to the working conditions to achieve automatic axial force balance.

[0033] It should be noted that, in this document, relational terms such as "first" and "second" are used merely to distinguish one entity or operation from another, and do not necessarily require or imply any such actual relationship or order between these entities or operations. Furthermore, the terms "comprising," "including," or any other variations thereof are intended to cover non-exclusive inclusion, such that a process, method, article, or apparatus that comprises a list of elements includes not only those elements but also other elements not expressly listed, or elements inherent to such a process, method, article, or apparatus. Additionally, in the accompanying drawings of this utility model, the fill patterns are merely for distinguishing layers and do not constitute any other limitation.

[0034] Although embodiments of the present invention have been shown and described, it will be understood by those skilled in the art that various changes, modifications, substitutions and alterations can be made to these embodiments without departing from the principles and spirit of the present invention, the scope of which is defined by the appended claims and their equivalents.

Claims

1. A centrifugal pump self-balancing device, including an inlet seat (1), characterized in that: An inlet pressure tap (2) is provided at the upper left side of the water inlet seat (1). An impeller (3) is installed above the water inlet seat (1). An outlet seat (4) is fixedly connected to the right side of the impeller (3) away from the water inlet seat (1). A self-balancing device (5) is provided at the upper end of the outlet seat (4) above the impeller (3). A pressure cover (7) is fixedly installed at the upper end of the self-balancing device (5) by fastening bolts (6). A mechanical seal (8) is provided on the inner side of the pressure cover (7). A bushing (9) located inside the mechanical seal (8) is sleeved on the inner wall of the pressure cover (7). A single diaphragm coupling (10) located above the pressure cover (7) is fixedly installed at the upper end of the bushing (9). A motor (11) is fixedly connected to the upper end of the single diaphragm coupling (10).

2. The centrifugal pump self-balancing device according to claim 1, characterized in that: The self-balancing device (5) includes an alloy inner ring (501), a bearing housing (502), an upper bearing (503), a thrust disc (504), and a lower bearing (505). The outer wall of the alloy inner ring (501) is sleeved with the inner wall of the upper bearing (503), and the outer wall of the upper bearing (503) is sleeved with the inner wall of the bearing housing (502). The upper bearing (503) and the bearing housing (502) are connected by bolts. The thrust disc (504) is disposed between the bearing housing (502) and the upper bearing (503). The lower bearing (505) is located above the impeller (3).

3. The centrifugal pump self-balancing device according to claim 2, characterized in that: The upper end of the alloy inner ring (501) is threadedly connected to the lower end of the fastening bolt (6), and the upper end of the fastening bolt (6) is threadedly connected to the inner wall of the gland (7).

4. The centrifugal pump self-balancing device according to claim 2, characterized in that: The lower end face of the upper bearing (503) and the upper end face of the lower bearing (505) are respectively provided with water grooves, and the number of water grooves is eight.

5. The centrifugal pump self-balancing device according to claim 2, characterized in that: The impeller (3) is fitted with a lower cover (16) located below the motor (11). The inner wall of the right side of the lower cover (16) is fixedly fitted with the outer wall of the water outlet seat (4). The upper end of the lower cover (16) is threaded with a limit bolt (17). The lower cover (16) is fixedly installed on the upper end of the water inlet seat (1) by the limit bolt (17), and the lower end of the limit bolt (17) extends into the interior of the upper end of the water inlet seat (1). The lower cover (16) is connected to the lower bearing (505) by bolts.

6. The centrifugal pump self-balancing device according to claim 5, characterized in that: A junction box (14) is fixedly installed on the left side of the motor (11), and an upper flange (15) located above the lower cover (16) is fixedly installed on the lower end face of the motor (11). Connecting bolts (13) are evenly distributed on the upper flange (15).

7. The centrifugal pump self-balancing device according to claim 6, characterized in that: The upper end of the lower cover (16) is movably mounted with an upper cover (18) located outside the single diaphragm coupling (10) via a limiting bolt (17). The upper end of the upper cover (18) is fixedly mounted with a lower flange (12) located below the upper flange (15). The lower flange (12) is mounted on the lower end of the upper flange (15) via a connecting bolt (13).

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