Pump multi-stage double-balancing-drum balancing mechanism adopting sealing ring set

Abstract

The utility model relates to a pump multi-stage double-balancing drum balancing mechanism adopting a sealing ring group, which comprises a pump body shell, a pump shaft and impellers, and further comprises a multi-stage double-balancing drum connected with the pump shaft, the multi-stage double-balancing drum is positioned behind the tail end impeller, and a high-pressure area is formed between the front end of the multi-stage double-balancing drum and the tail end impeller. A low-pressure area is arranged at the rear end of the multi-stage double-balance drum and connected with a pump suction inlet through a balance pipe. A plurality of first sealing rings are arranged on the multi-stage double-balance drum, a plurality of second sealing rings are arranged on the pump body shell, and the first sealing rings and the second sealing rings are matched to form a multi-stage sealing ring set. According to the utility model, the manufacturing and assembling requirements are reduced, the application range is expanded, the medium leakage is greatly reduced, the energy consumption is reduced, the maintenance cost is reduced, and the stability and the safety of the balance mechanism are improved.

Description

Technical Field

[0001] The utility model relates to the technical field of water pumps, in particular to a multi-stage double-balance drum balancing mechanism for a pump using a sealing ring group. Background Art

[0002] The centrifugal pump relies on the action of the rotating impeller on the liquid to convert the mechanical energy of the prime mover into the pressure energy of the medium. A pressure difference will be generated between the outlet and the inlet of the centrifugal pump, and under the action of this pressure difference, a large axial thrust will appear from the high pressure at the outlet to the low pressure at the inlet. This requires balancing the axial thrust, otherwise the bearings will be damaged.

[0003] At present, double balancing drum balancing mechanism is mostly used to balance the axial force. The existing double balancing drum balancing mechanism is mostly a combined single-stage structure of balancing drum + balancing disc. In this structure, the balancing disc and the balancing drum are an integral whole, which is tightly matched with the right-angle sealing ring assembled on the pump body shell. This matching setting plays a balancing role, but there is a risk of leakage. In order to minimize leakage and play a sealing role, it is usually necessary to minimize its matching clearance, which results in relatively high requirements in manufacturing and assembly. In addition, the balancing mechanism as a whole is directly used with the right-angle sealing ring. During operation, the balancing mechanism will directly rub against the right-angle sealing ring, resulting in serious wear, which will affect the function of the overall mechanism. In severe cases, the entire mechanism must be replaced, increasing the maintenance cost. In addition, its best working condition is a clean medium without solid particles. If it is used in an industrial and mining environment containing a large amount of sand and stone, it will affect the stability and service life of the mechanism, and frequent starting or low-speed operation will also affect the service life of the mechanism. Finally, the existing double balancing drum balancing mechanism is a single-stage mechanism. As the pressure difference on both sides of its diameter and axial direction increases, its leakage will also increase, causing energy consumption. Utility Model Content

[0004] In view of the existing problems, the utility model proposes a multi-stage double balance drum balancing mechanism for a pump using a sealing ring group, which reduces the requirements for manufacturing and assembly, expands the scope of application, greatly reduces the medium leakage to reduce energy consumption, reduces maintenance costs, and improves the stability and safety of the balancing mechanism.

[0005] The technical solution of the utility model is achieved in this way:

[0006] A multi-stage double balance drum balancing mechanism for a pump using a sealing ring group includes a pump body shell, a pump shaft and an impeller, and also includes a multi-stage double balance drum connected to the pump shaft, the multi-stage double balance drum is located behind the terminal impeller, and a high-pressure area is formed between the front end of the multi-stage double balance drum and the terminal impeller, and a low-pressure area is provided at the rear end of the multi-stage double balance drum, and the low-pressure area is connected to the pump suction port through a balance pipe;

[0007] A plurality of first sealing rings are arranged on the multi-stage double balance drum, a plurality of second sealing rings are arranged on the pump body shell, and the plurality of first sealing rings and the plurality of second sealing rings cooperate to form a multi-stage sealing ring group.

[0008] Preferably, the multi-stage double balance drum is of a multi-stage circular step type, and the diameter of each step is reduced in a step-like manner from the high-pressure area to the low-pressure area.

[0009] Preferably, the multi-stage sealing ring groups are all arranged at the step corners of each circular step, and the diameter of each stage of the sealing ring group is also reduced in a step-like manner from the high-pressure area to the low-pressure area.

[0010] Preferably, the first sealing ring is a flat ring type sealing ring, the second sealing ring is a right angle type sealing ring, and the lower corners of the multi-stage flat ring type sealing rings respectively correspond to the right angles of the multi-stage right angle type sealing rings one by one.

[0011] Preferably, the first sealing ring is a flat ring type sealing ring, the second sealing ring is a flat ring type sealing ring, and the outer ring surfaces of the multi-stage first sealing rings respectively correspond to the outer ring surfaces of the multi-stage second sealing rings one by one.

[0012] Preferably, the first sealing ring and the second sealing ring are both integrally stepped right-angle sealing rings, the integrally stepped right-angle sealing rings are provided with multiple first right angles, and the first sealing ring and the second sealing ring are matched through the multiple first right angles.

[0013] Preferably, the first sealing ring is a flat ring type sealing ring, and the second sealing ring is an integral stepped right-angle type sealing ring, and the integral stepped right-angle type sealing ring and the multi-stage flat ring type sealing ring are matched one-to-one.

[0014] Compared with the prior art, the utility model has the following advantages:

[0015] In the utility model, the double balancing drum balancing mechanism adopts a multi-stage double balancing drum, and a plurality of first sealing rings are arranged on the multi-stage double balancing drum, and a plurality of second sealing rings are arranged on the pump body shell, and a multi-stage sealing ring group is formed by the cooperation of the plurality of first sealing rings and the plurality of second sealing rings. Firstly, the sealing ring group is cooperated between the multi-stage double balancing drum and the pump body shell, and this cooperation mode has a lower requirement on the precision of the cooperation clearance, thereby reducing the requirements for manufacturing and assembly; secondly, because the cooperation clearance is large and the hardness and strength of the sealing ring group are relatively high, it is suitable for cleaning medium or medium containing solid particles. quality, and has a wider range of applications; in addition, the multi-stage setting of the multi-stage double balance drum and the multi-stage sealing ring group, and the step diameter of the multi-stage double balance drum decreases step by step from the high-pressure area to the low-pressure area, greatly reducing the leakage cross-sectional area, thereby greatly reducing the leakage amount, reducing energy consumption, and compensating for the large matching gap and causing a large amount of medium leakage; finally, the use of the multi-stage sealing ring group can avoid serious wear of the multi-stage double balance drum and the pump body shell. If the wear is serious, only the damaged sealing ring needs to be replaced, which reduces the maintenance cost, extends the service life of the balance drum, and improves the stability and safety of the balance mechanism. BRIEF DESCRIPTION OF THE DRAWINGS

[0016] In order to more clearly illustrate the embodiments of the utility model or the technical solutions in the prior art, the drawings required for use in the embodiments or the description of the prior art will be briefly introduced below. Obviously, the drawings described below are only some embodiments of the utility model. For ordinary technicians in this field, other drawings can be obtained based on these drawings without paying creative labor.

[0017] Figure 1 It is a cross-sectional schematic diagram of a multi-stage double balancing drum balancing mechanism according to a first embodiment of the utility model;

[0018] Figure 2 It is a cross-sectional schematic diagram of a multi-stage dual-balance drum balancing mechanism of Embodiment 2 of the present utility model;

[0019] Figure 3 It is a cross-sectional schematic diagram of a multi-stage dual-balance drum balancing mechanism of Embodiment 3 of the present utility model;

[0020] Figure 4 It is a cross-sectional schematic diagram of a multi-stage dual balancing drum balancing mechanism according to a fourth embodiment of the utility model.

[0021] Figure ID:

[0022] 10. Multi-stage double balance drum; 1. Sealing ring assembly; 11. First sealing ring; 12. Second sealing ring; 2. High-pressure area; 3. Low-pressure area; 4. First right angle; 5. Second right angle; 6. Pump casing sealing ring; 7. Impeller inter-impeller sealing ring; 8. Balance pipe; 20. Pump casing; 30. Pump shaft; 40. Impeller. DETAILED DESCRIPTION

[0023] The following will be combined with the drawings in the embodiments of the utility model to clearly and completely describe the technical solutions in the embodiments of the utility model. Obviously, the described embodiments are only part of the embodiments of the utility model, not all of the embodiments. Based on the embodiments of the utility model, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the utility model.

[0024] In the description of the present invention, it should be noted that the directions or positional relationships indicated by terms such as "upper", "lower", "left", "right", "inside" and "outside" 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, and do not indicate or imply that the device or element referred to must have a specific direction, be constructed and operated in a specific direction, and therefore cannot be understood as a limitation on the present invention.

[0025] In the description of the present invention, it should be noted that, unless otherwise clearly specified and limited, the terms "installation", "connection" and "connection" should be understood in a broad sense, for example, it can be a fixed connection, a detachable connection, or an integral connection; it can be a mechanical connection or an electrical connection; it can be a direct connection, or it can be indirectly connected through an intermediate medium, or it can be the internal communication of two components. For ordinary technicians in this field, the specific meanings of the above terms in the present invention can be understood according to specific circumstances.

[0026] Embodiment 1

[0027] like Figure 1 As shown, a multi-stage double-balance drum balancing mechanism for a pump using a sealing ring group provided by the utility model includes a pump housing 20, a pump shaft 30 and an impeller 40. The impeller 40 is rotatably arranged on the pump shaft 30. The pump converts the mechanical energy of the prime mover into the pressure energy of the medium by the action of the rotating impeller 40 on the medium. A pressure difference is generated between the outlet and the inlet of the pump, and under the action of the pressure difference, an axial thrust is generated from the high pressure at the outlet to the low pressure at the inlet.

[0028] The multi-stage double balance drum balancing mechanism also includes a multi-stage double balance drum 10 connected to the pump shaft 30. The multi-stage double balance drum 10 is located behind the terminal impeller 40, and a high-pressure area 2 is formed between the front end of the multi-stage double balance drum 10 and the terminal impeller 40. A low-pressure area 3 is provided at the rear end of the multi-stage double balance drum 10. A pressure difference is formed between the high-pressure area 2 and the low-pressure area 3 at the front and rear ends of the multi-stage double balance drum 10. The force direction of the pressure difference is opposite to the axial thrust, which is a balancing force for the axial thrust; and a balance pipe 8 is provided at the low-pressure area 3 to be connected to the pump suction port. The balance pipe 8 is a way to balance the axial thrust. It guides the pressure water behind the impeller 40 to the pump suction port through the balance pipe 8, so that the pressures on both sides of the impeller 40 are balanced, reducing the risk of mechanical wear and failure caused by unbalanced force, so that the axial force balance is finally achieved;

[0029] A plurality of first sealing rings 11 are provided on the multi-stage double balance drum 10, and a plurality of second sealing rings 12 are provided on the pump housing 20. The plurality of first sealing rings 11 and the plurality of second sealing rings 12 cooperate to form a multi-stage sealing ring set 1;

[0030] First, the multi-stage double balance drum 10 and the pump housing 20 are matched through the multi-stage sealing ring group 1. This matching mode is similar to the double sealing ring matching scheme between the pump housing sealing ring 6 and the impeller inter-sealing ring 7. According to the API610 / ISO13709 standard, under normal circumstances, the standard range of the matching clearance between the pump housing sealing ring 6 and the impeller inter-sealing ring 7 is between 0.3mm and 1.0mm, and the precision requirement of this standard clearance is not high. Therefore, the matching clearance of the multi-stage sealing ring group 1 between the multi-stage double balance drum 10 and the pump housing 20 is larger, and the precision requirement of the matching clearance is lower, thereby reducing the requirements for manufacturing and assembly;

[0031] Secondly, since the matching gap is large and the hardness and strength of the multi-stage sealing ring group 1 are relatively high, it is suitable for cleaning media or media containing solid particles and has a wider range of applications;

[0032] Most importantly, in this embodiment, the multi-stage double balance drum 10 is a multi-stage circular step type, the first sealing ring 11 is a flat ring type sealing ring, and the second sealing ring 12 is a right-angle type sealing ring; wherein, the medium passing through the multi-stage radial gap of the multi-stage circular step will produce a greater flow resistance than a single stage, so the leakage of the medium through the gap will be greatly reduced; and, the multi-stage double balance drum 10 is respectively provided with a flat ring type sealing ring at the step angle of each circular step, and the pump body shell 20 is correspondingly provided with a right-angle type sealing ring at each level of the flat ring type sealing ring, and the lower corners of the multi-stage flat ring type sealing ring are respectively matched with the right angles of the multi-stage right-angle type sealing ring, so as to play a multi-stage two-side sealing role, which can greatly reduce the leakage of the medium, can make up for the large leakage of the medium caused by the large matching gap, and reduce energy consumption;

[0033] In addition, the sealing ring group 1 is an annular component fixed on the multi-stage double balance drum 10 and the pump body casing 20. The use of the multi-stage sealing ring group 1 can avoid serious wear of the multi-stage double balance drum 10 and the pump body casing 20, and if serious wear is caused by solid particles, only the damaged sealing ring needs to be replaced, thereby reducing maintenance costs, extending the service life of the balance drum, and improving the stability and safety of the balancing mechanism.

[0034] Furthermore, the multi-stage circular step type multi-stage double balance drum 10 has a diameter of each step decreasing in a step-like manner from the high-pressure zone 2 to the low-pressure zone 3, and the sealing ring group 1 arranged at the step corner of each circular step has a diameter of each step decreasing in a step-like manner from the high-pressure zone 2 to the low-pressure zone 3. The diameter of the multi-stage double balance drum 10 and the sealing ring group 1 on the low-pressure zone 3 side is the minimum diameter. Compared with the high-pressure zone 2, the leakage cross-sectional area of ​​the low-pressure zone 3 is greatly reduced, thereby greatly reducing the medium leakage and reducing energy consumption under the same application conditions.

[0035] Furthermore, the number of sealing ring groups 1 can be determined according to the diameter of the pump suction port, the impeller suction port and the pressure difference formed at the front and rear ends of the multi-stage double balance drum 10, but at least two stages of sealing ring groups 1 are set. By increasing or decreasing the number of sealing ring groups 1 to appropriately reduce the amount of medium leakage, energy consumption is reduced.

[0036] Embodiment 2

[0037] like Figure 2 As shown, the difference from the first embodiment is that the first sealing ring 11 is a flat ring sealing ring, the second sealing ring 12 is a flat ring sealing ring, the multi-stage double balance drum 10 is respectively provided with a flat ring sealing ring at the step corner of each circular step, and the pump body shell 20 is correspondingly provided with a flat ring sealing ring at each level of the flat ring sealing ring, and the outer ring surfaces of the multi-stage first sealing ring 11 are respectively matched with the outer ring surfaces of the multi-stage second sealing ring 12 one by one, playing a multi-stage and multi-faceted sealing role, which can greatly reduce the leakage of the medium, can make up for the large leakage of the medium caused by the large matching gap, and reduce energy consumption.

[0038] Embodiment 3

[0039] like Figure 3 As shown, the difference from the first embodiment is that the first sealing ring 11 and the second sealing ring 12 are both integral stepped right-angle sealing rings, and the integral stepped right-angle sealing ring is provided with a multi-stage first right angle 4. The sealing ring assembly 1 of this embodiment realizes multi-stage matching through the multi-stage first right angle 4 of the first sealing ring 11 and the second sealing ring 12;

[0040] The multi-stage first right angles 4 are respectively arranged at each step angle of the multi-stage double balance drum 10 and the corresponding position of the pump body shell 20. Through the one-to-one correspondence of the multi-stage first right angles 4, a multi-stage multi-faceted sealing effect is achieved, which can greatly reduce the leakage of the medium, compensate for the large amount of medium leakage caused by the large matching gap, and reduce energy consumption.

[0041] Embodiment 4

[0042] like Figure 4 As shown, the difference from the first embodiment is that the first sealing ring 11 is a flat ring sealing ring, and the second sealing ring 12 is an integral stepped right-angle sealing ring. The sealing ring set 1 of this embodiment realizes multi-level matching through one-to-one correspondence between the integral stepped right-angle sealing ring and the multi-level flat ring sealing ring;

[0043] The multi-stage flat ring type sealing ring is arranged at each step angle of the multi-stage double balance drum 10, and a second right angle 5 is provided on the integral stepped right-angle sealing ring. The pump body casing 20 is arranged corresponding to the multi-stage flat ring type sealing ring through the second right angle 5 and the plane on the integral stepped right-angle sealing ring, thereby playing a multi-stage and multi-faceted sealing role, which can greatly reduce the leakage of the medium, compensate for the large amount of medium leakage caused by the large matching gap, and reduce energy consumption.

[0044] In summary, in the utility model, the double balance drum balancing mechanism adopts a multi-stage double balance drum 10, and a plurality of first sealing rings 11 are provided on the multi-stage double balance drum 10, and a plurality of second sealing rings 12 are provided on the pump body shell 20, and a multi-stage sealing ring group 1 is formed by the cooperation of the plurality of first sealing rings 11 and the plurality of second sealing rings 12. Firstly, the sealing ring group 1 is used to cooperate between the multi-stage double balance drum 10 and the pump body shell 20, and this cooperation mode has low requirements on the precision of the cooperation clearance, thereby reducing the requirements for manufacturing and assembly; secondly, since the cooperation clearance is large and the hardness and strength of the sealing ring group 1 are relatively high, it is suitable for cleaning media or media containing solid particles, and should be The application range is wider; in addition, the multi-stage setting of the multi-stage double balance drum 10 and the multi-stage sealing ring group 1 can make up for the large medium leakage caused by the large matching gap, greatly reduce the leakage amount, and reduce energy consumption. At the same time, the diameter of each step of the multi-stage double balance drum 10 from the high-pressure area 2 to the low-pressure area 3 is reduced in a step-by-step manner, so that the leakage cross-sectional area is greatly reduced, thereby reducing the leakage amount and reducing energy consumption; finally, the use of the multi-stage sealing ring group 1 can avoid serious wear of the multi-stage double balance drum 10 and the pump body shell 20. If the wear is serious, only the damaged sealing ring needs to be replaced, which reduces the maintenance cost, extends the service life of the balance drum, and improves the stability and safety of the balance mechanism.

[0045] The above description is only a preferred embodiment of the present invention and is not intended to limit the present invention. Any modifications, equivalent substitutions, improvements, etc. made within the spirit and principles of the present invention should be included in the protection scope of the present invention.

Claims

1. A multi-stage double balance drum balancing mechanism for a pump using a sealing ring group, comprising a pump housing (20), a pump shaft (30) and an impeller (40), characterized in that: The pump also comprises a multi-stage double balance drum (10) connected to the pump shaft (30), the multi-stage double balance drum (10) being located behind the impeller (40) at the end, and a high-pressure area (2) being formed between the front end of the multi-stage double balance drum (10) and the impeller (40) at the end, and a low-pressure area (3) being provided at the rear end of the multi-stage double balance drum (10), and the low-pressure area (3) being connected to the pump suction port via a balance pipe (8); The multi-stage double balance drum (10) is provided with a plurality of first sealing rings (11), the pump body shell (20) is provided with a plurality of second sealing rings (12), and the plurality of first sealing rings (11) and the plurality of second sealing rings (12) cooperate to form a multi-stage sealing ring group (1).

2. The multi-stage double balance drum balancing mechanism for a pump according to claim 1, characterized in that: The multi-stage double balance drum (10) is of a multi-stage circular step type, and the diameter of each step decreases in a step-like manner from the high-pressure area (2) to the low-pressure area (3).

3. The multi-stage double balance drum balancing mechanism for a pump according to claim 2, characterized in that: The multiple-stage sealing ring groups (1) are all arranged at the step angle of each circular step, and the diameter of each stage of the sealing ring group (1) is also arranged to decrease in a step-like manner from the high-pressure area (2) to the low-pressure area (3).

4. The multi-stage double balance drum balancing mechanism for a pump according to claim 3, characterized in that: The first sealing ring (11) is a flat ring type sealing ring, the second sealing ring (12) is a right angle type sealing ring, and the lower corners of the multi-stage flat ring type sealing rings respectively correspond to the right angles of the multi-stage right angle type sealing rings.

5. The multi-stage double balance drum balancing mechanism for a pump according to claim 3, characterized in that: The first sealing ring (11) is a flat ring type sealing ring, the second sealing ring (12) is a flat ring type sealing ring, and the outer ring surfaces of the multi-stage first sealing rings (11) respectively correspond to the outer ring surfaces of the multi-stage second sealing rings (12) in a one-to-one manner.

6. The multi-stage double balance drum balancing mechanism for a pump according to claim 3, characterized in that: The first sealing ring (11) and the second sealing ring (12) are both integral stepped right-angle sealing rings, on which a plurality of first right angles (4) are provided, and the first sealing ring (11) and the second sealing ring (12) are matched via the plurality of first right angles (4).

7. The multi-stage double balance drum balancing mechanism for a pump according to claim 3, characterized in that: The first sealing ring (11) is a flat ring type sealing ring, and the second sealing ring (12) is an integral stepped right-angle sealing ring, and the integral stepped right-angle sealing ring is matched with the multi-stage flat ring type sealing rings in a one-to-one correspondence.

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