Balancing structure of pressure-resistant centrifugal pump

Abstract

The utility model discloses a balance structure of a pressure-resistant centrifugal pump, which belongs to the technical field of centrifugal pumps, and comprises a balance disc, a shaft sleeve and a pump shaft, the shaft sleeve is arranged in the balance disc, an inner cylinder is arranged in the shaft sleeve, a hidden groove is arranged at the top end of the shaft sleeve, a positioning screw hole is arranged in the hidden groove, and the pump shaft is arranged in the pump shaft. The positioning screw hole penetrates through the shaft sleeve, a connecting screw hole is formed in the top end of the inner barrel in a matched mode and does not penetrate through the inner barrel, a connecting bolt is connected into the connecting screw hole and the positioning screw hole in a threaded mode, a hexagonal hole is formed in the center of the top end of the connecting bolt, and a through hole is formed in the edge of the inner barrel. And a connecting hole matched with the through hole is formed in the pump shaft, so that the sealing performance of the pump shaft and the shaft sleeve is improved.

Description

Technical Field

[0001] This utility model relates to the field of centrifugal pump technology, specifically to a balancing structure for a pressure-resistant centrifugal pump. Background Technology

[0002] A pressure-resistant centrifugal pump is a type of centrifugal pump specifically designed for conveying high-pressure media. Its core characteristics include stable operation under high-pressure conditions and excellent sealing and structural strength. During centrifugal pump operation, because the liquid enters the impeller under low pressure and flows out under high pressure, the pressure on both sides of the impeller is unequal, generating an axial thrust pointing towards the inlet. This can cause axial movement of the rotor, resulting in wear and vibration. Therefore, an axial force balancing device is required. Current centrifugal pumps use a balance disc as the axial force balancing device to alleviate the pressure from the pump outlet to the inlet. However, the current balance disc is connected to the pump shaft via a bushing. The seal between the bushing and the pump shaft is generally not tight, allowing liquid to enter, increasing wear, and affecting pump operation.

[0003] Based on this, the present invention designs a balancing structure for a pressure-resistant centrifugal pump to solve the above problems. Utility Model Content

[0004] In view of the above-mentioned shortcomings of the existing technology, the present invention provides a balanced structure for a pressure-resistant centrifugal pump.

[0005] To achieve the above objectives, this utility model provides the following technical solution:

[0006] A balancing structure for a pressure-resistant centrifugal pump includes a balancing disc, a bushing, and a pump shaft. The bushing is installed inside the balancing disc, and an inner cylinder is provided inside the bushing. A hidden groove is provided at the top of the bushing, and a positioning screw hole is provided in the hidden groove. The positioning screw hole penetrates the bushing. A connecting screw hole is provided at the top of the inner cylinder, but does not penetrate the inner cylinder. A connecting bolt is internally threaded to the connecting screw hole and the positioning screw hole. A hexagonal hole is provided at the center of the top of the connecting bolt. A through hole is provided at the edge of the inner cylinder, and a connecting hole is provided on the pump shaft to mate with the through hole.

[0007] Furthermore, the balance disc is located at the center of the bushing, and there are two sets of inner cylinders symmetrically arranged on both sides of the bushing. The inner cylinder portion is located on the outside of the bushing, and the through hole is located on this portion of the inner cylinder.

[0008] Furthermore, the end of the connecting bolt is located in the hidden groove, and the horizontal plane at the top of the bolt is lower than the horizontal plane at the top of the hidden groove.

[0009] Furthermore, the inner wall of the bushing is provided with rectangular grooves symmetrically opened on both sides, and a rectangular strip is fixedly fitted on the side wall of the inner cylinder, with the connecting screw hole set on the rectangular strip.

[0010] Furthermore, the rectangular groove extends through the side of the bushing, the rectangular bar has the same shape and size as the rectangular groove, one end of the rectangular bar and one end of the inner cylinder are on the same vertical plane, and the length of the rectangular bar is less than the length of the inner cylinder.

[0011] Furthermore, the inner cylinder includes an upper half ring and a lower half ring, the rectangular strip is fixed to the upper half ring and the lower half ring, the connecting screw hole is provided on the rectangular strip on the upper half ring, and the through hole is provided on the upper half ring.

[0012] Furthermore, the bottom of the upper half ring is fixed with a mounting block, and the top of the lower half ring is provided with a mounting groove. The mounting groove extends through the side of the lower half ring, and the mounting block is threadedly fixed in the mounting groove.

[0013] Furthermore, the lower half-ring bottom end, located on the outer sidewall of the bushing, is provided with anti-slip texture. Beneficial effects

[0014] 1. By setting an inner cylinder, positioning screw holes, connecting screw holes and connecting bolts, the inner cylinder is fixed in the bushing by using the threaded connection of the connecting bolts to the positioning screw holes and connecting screw holes. The presence of the inner cylinder improves the sealing performance of the pump shaft and bushing. When it is worn out due to long-term use and needs to be replaced, it is only necessary to remove the inner cylinder in the bushing and replace it with a new inner cylinder. There is no need to separate the bushing and the balance disc, which is convenient for use.

[0015] 2. By setting rectangular grooves and rectangular bars, the connection between the inner cylinder and the bushing is facilitated through the cooperation of the rectangular bars and rectangular grooves; by setting upper half ring, lower half ring, mounting block and mounting groove, the inner cylinder is further facilitated to be installed in the bushing through the cooperation of the mounting block and mounting groove; by setting anti-slip texture, it is easy to remove the inner cylinder from the bushing. Attached Figure Description

[0016] To more clearly illustrate the technical solutions in the embodiments of this utility model or the prior art, the drawings used in the description of the embodiments or the prior art will be briefly introduced below. Obviously, the drawings described below are only some embodiments of this utility model. For those skilled in the art, other drawings can be obtained based on these drawings without creative effort.

[0017] Figure 1 This is a three-dimensional view of the main structure of the balancing structure of a pressure-resistant centrifugal pump according to this utility model;

[0018] Figure 2 This is a perspective view of the shaft sleeve structure of the balancing structure of a pressure-resistant centrifugal pump according to the present invention;

[0019] Figure 3This is a three-dimensional view of the upper half-ring structure of the balancing structure of a pressure-resistant centrifugal pump according to the present invention.

[0020] Figure 4 This is a three-dimensional view of the lower half-ring structure of the balancing structure of a pressure-resistant centrifugal pump according to this utility model.

[0021] The labels in the diagram represent:

[0022] 1. Balance disc; 2. Bushing; 3. Pump shaft; 4. Inner cylinder; 5. Concealed groove; 6. Positioning screw hole; 7. Connecting screw hole; 8. Connecting bolt; 9. Hexagonal hole; 10. Through hole; 11. Connecting hole; 12. Rectangular groove; 13. Rectangular bar; 14. Upper half ring; 15. Lower half ring; 16. Mounting block; 17. Mounting groove; 18. Anti-slip texture. Detailed Implementation

[0023] To make the objectives, technical solutions, and advantages of the embodiments of this utility model clearer, the technical solutions of the embodiments of this utility model will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some, not all, of the embodiments of this utility model. All other embodiments obtained by those skilled in the art based on the embodiments of this utility model without creative effort are within the scope of protection of this utility model.

[0024] The present invention will be further described below with reference to the embodiments.

[0025] In some embodiments, please refer to the accompanying drawings. Figure 1 , Figure 2 and Figure 3 A balancing structure for a pressure-resistant centrifugal pump includes a balancing disc 1, a bushing 2, and a pump shaft 3. The bushing 2 is installed inside the balancing disc 1, and an inner cylinder 4 is provided inside the bushing 2. A hidden groove 5 is provided at the top of the bushing 2, and a positioning screw hole 6 is provided in the hidden groove 5. The positioning screw hole 6 passes through the bushing 2. A connecting screw hole 7 is provided at the top of the inner cylinder 4. The connecting screw hole 7 does not pass through the inner cylinder 4. A connecting bolt 8 is internally threaded to the connecting screw hole 7 and the positioning screw hole 6. A hexagonal hole 9 is provided at the center of the top of the connecting bolt 8. A through hole 10 is provided on the edge of the inner cylinder 4. A connecting hole 11 is provided on the pump shaft 3 to fit the through hole 10.

[0026] In this embodiment of the utility model, during use, the inner cylinder 4 is installed at both ends of the bushing 2, and the positioning screw hole 6 and the connecting screw hole 7 are connected by the connecting bolt 8 to fix the inner cylinder 4 inside the bushing 2. Then, the pump shaft 3 is connected to the inner cylinder 4 and the bushing 2 to realize the installation of the balance disc 1. During use, the presence of the inner cylinder 4 improves the sealing performance of the pump shaft 3 and the bushing 2. When it is worn out due to long-term use and needs to be replaced, it is only necessary to remove the inner cylinder 4 inside the bushing 2 and replace it with a new inner cylinder 4. There is no need to separate the bushing 2 and the balance disc 1, which is convenient for use.

[0027] In this embodiment of the utility model, by setting an inner cylinder 4, a positioning screw hole 6, a connecting screw hole 7 and a connecting bolt 8, the positioning screw hole 6 and the connecting screw hole 7 are connected by the connecting bolt 8 to fix the inner cylinder 4 inside the bushing 2. The presence of the inner cylinder 4 improves the sealing performance of the pump shaft 3 and the bushing 2. When it is worn and replaced due to long-term use, it is only necessary to remove the inner cylinder 4 inside the bushing 2 and replace it with a new inner cylinder 4. There is no need to separate the bushing 2 and the balance disc 1, which is convenient for use.

[0028] In one embodiment of this utility model, the balance disc 1 is located at the center of the bushing 2. There are two sets of inner cylinders 4 symmetrically arranged on both sides of the bushing 2 to improve the connection strength between the inner cylinder 4 and the bushing 2. The inner cylinder 4 is located outside the bushing 2 and the through hole 10 is provided on this part of the inner cylinder 4 to facilitate the installation and separation of the inner cylinder 4 and the bushing 2. The end of the connecting bolt 8 is located in the hidden groove 5 and the horizontal plane of the top of the bolt is lower than the horizontal plane of the top of the hidden groove 5. The inner wall of the bushing 2 is symmetrically provided with rectangular grooves 12 on both sides. The rectangular grooves 12 are provided through the side of the bushing 2. A rectangular strip 13 is fixed on the side wall of the inner cylinder 4. The connecting screw hole 7 is provided on the rectangular strip 13. The shape and size of the rectangular strip 13 are the same as the shape and size of the rectangular groove 12. One end of the rectangular strip 13 and one end of the inner cylinder 4 are on the same vertical plane. The length of the rectangular strip 13 is less than the length of the inner cylinder 4. The inner cylinder 4 is fixed in the bushing 2 by the cooperation of the rectangular strip 13 and the rectangular groove 12.

[0029] In some embodiments, such as Figure 1 , Figure 3 and Figure 4 As shown, the inner cylinder 4 includes an upper half-ring 14 and a lower half-ring 15. A rectangular strip 13 is fixed to the upper half-ring 14 and the lower half-ring 15. A connecting screw hole 7 is provided on the rectangular strip 13 on the upper half-ring 14, and a through hole 10 is provided on the upper half-ring 14. A mounting block 16 is fixed to the bottom end of the upper half-ring 14, and a mounting groove 17 is provided at the top end of the lower half-ring 15. The mounting groove 17 is provided through the side of the lower half-ring 15, and the mounting block 16 is threadedly fixed in the mounting groove 17. The lower half-ring 15 has anti-slip texture 18 on the side wall located outside the bushing 2.

[0030] In this embodiment of the utility model, during use, the lower half ring 15 is first installed in the bushing 2 with the cooperation of the rectangular bar 13 and the rectangular groove 12. Then, the upper half ring 14 is installed in the bushing 2 with the cooperation of the rectangular bar 13 and the rectangular groove 12. The inner cylinder 4 is installed at both ends of the bushing 2 by using the cooperation of the mounting block 16 and the mounting groove 17. Then, the inner cylinder 4 is fixed in the bushing 2 by using the threaded connection of the connecting bolt 8 to the positioning screw hole 6 and the connecting screw hole 7. Then, the pump shaft 3 is connected to the inner cylinder 4 and the bushing 2 to realize the installation of the balance disc 1. During use, the presence of the inner cylinder 4 improves the sealing performance of the pump shaft 3 and the bushing 2. When it is worn and replaced due to long-term use, the connecting bolt 8 is removed to separate the inner cylinder 4 and the bushing 2. The inner cylinder 4 in the bushing 2 is removed by the anti-slip texture 18 and a new inner cylinder 4 is replaced. There is no need to separate the bushing 2 and the balance disc 1, which is convenient for use.

[0031] In this embodiment of the utility model, by setting an upper half ring 14, a lower half ring 15, a mounting block 16 and a mounting groove 17, the inner cylinder 4 is easily installed in the bushing 2 by utilizing the cooperation of the mounting block 16 and the mounting groove 17; by setting anti-slip texture 18, it is easy to remove the inner cylinder 4 from the bushing 2.

[0032] The above embodiments are only used to illustrate the technical solutions of this utility model, and are not intended to limit it. Although this utility model has been described in detail with reference to the foregoing embodiments, those skilled in the art should understand that modifications can still be made to the technical solutions described in the foregoing embodiments, or equivalent substitutions can be made to some of the technical features. Such modifications or substitutions will not cause the essence of the corresponding technical solutions to deviate from the spirit and scope of the technical solutions of the embodiments of this utility model.

Claims

1. A balancing structure of a pressure-tolerant centrifugal pump, comprising a balancing disc (1), a shaft sleeve (2) and a pump shaft (3), characterized in that: The shaft sleeve (2) is installed in the balance disc (1), the inner cylinder (4) is arranged in the shaft sleeve (2), the hidden groove (5) is formed in the top end of the shaft sleeve (2), the positioning screw hole (6) is formed in the hidden groove (5), the positioning screw hole (6) is arranged through the shaft sleeve (2), the connecting screw hole (7) is formed in the top end of the inner cylinder (4), the connecting screw hole (7) is not arranged through the inner cylinder (4), the connecting screw hole (7) and the positioning screw hole (6) are screw-connected with the connecting bolt (8), the hexagonal hole (9) is formed in the top end center of the connecting bolt (8), the through hole (10) is formed in the edge of the inner cylinder (4), and the connecting hole (11) is formed in the pump shaft (3) in cooperation with the through hole (10).

2. The balance structure of a pressure-resistant centrifugal pump according to claim 1, characterized by, The balance disc (1) is located at the center position of the shaft sleeve (2), the inner cylinder (4) is arranged symmetrically on both sides of the shaft sleeve (2), and the inner cylinder (4) is partially located outside the shaft sleeve (2) and the through hole (10) is arranged on the part of the inner cylinder (4).

3. The balance structure of a pressure-resistant centrifugal pump according to claim 2, characterized by, The end of the connecting bolt (8) is located in the hidden groove (5), and the top end is located below the horizontal plane of the top end of the hidden groove (5).

4. The balance structure of a pressure-resistant centrifugal pump according to claim 3, wherein The rectangular grooves (12) are symmetrically formed on the inner wall of the shaft sleeve (2), the rectangular bars (13) are fixed on the side wall of the inner cylinder (4), and the connecting screw holes (7) are arranged on the rectangular bars (13).

5. The balance structure of a pressure-resistant centrifugal pump according to claim 4, wherein The rectangular grooves (12) are arranged through the side of the shaft sleeve (2), the shape and size of the rectangular bar (13) are same as those of the rectangular groove (12), one end of the rectangular bar (13) and one end of the inner cylinder (4) are located on the same vertical plane, and the length of the rectangular bar (13) is less than that of the inner cylinder (4).

6. The balance structure of a pressure-resistant centrifugal pump according to claim 5, wherein The inner cylinder (4) comprises an upper half ring (14) and a lower half ring (15), the rectangular bars (13) are fixed on the upper half ring (14) and the lower half ring (15), the connecting screw holes (7) are arranged on the rectangular bars (13) on the upper half ring (14), and the through holes (10) are arranged on the upper half ring (14).

7. The balance structure of a pressure-resistant centrifugal pump according to claim 6, wherein The mounting block (16) is fixed to the bottom end of the upper half ring (14), the mounting groove (17) is formed in the top end of the lower half ring (15), the mounting groove (17) is arranged through the side of the lower half ring (15), and the mounting block (16) is screw-fixed in the mounting groove (17).

8. The balance structure of a pressure-resistant centrifugal pump according to claim 7, wherein The anti-skid lines (18) are arranged on the part of the side wall of the lower half ring (15) located outside the shaft sleeve (2).

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