Centrifugal pump wear ring structure

Abstract

The utility model relates to a wear ring structure of a centrifugal pump. The utility model comprises a volute which is provided with a volute opening; the impeller is arranged in the volute opening, the impeller comprises a plurality of blades, the blades jointly extend to an impeller spigot, the outer side end of the impeller spigot extends outwards to form an impeller ring, and a step structure is formed between the impeller ring and the impeller spigot; an annular groove for the impeller ring to stretch in is formed in the inner wall face, close to the volute opening, of the volute, the impeller ring is in clearance fit with the annular groove, and a gap is formed between the step structure and the inner wall face of the volute. After high-pressure liquid passes through the external wear ring gap, the axial gap of the top of the impeller, the internal wear ring gap and the axial gap of the spigot of the impeller, a local low-pressure area near the inlet edge of the blade is compensated, so that the leakage rate is reduced, and the efficiency of the pump is improved.

Description

Technical Field

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

[0002] To ensure the normal operation of a centrifugal pump, a certain impeller ring gap needs to be maintained between the impeller ring of the centrifugal pump and the volute. If the impeller ring gap is too small, the impeller is prone to jamming; if the impeller ring gap is too large, it will lead to an increase in impeller ring leakage.

[0003] Due to the limitations of materials and manufacturing processes, it is difficult to precisely control the impeller ring gap. To avoid impeller jamming, the existing structures usually choose a larger impeller ring gap, which results in a larger impeller ring leakage. Summary of the Invention

[0004] Therefore, the utility model provides a centrifugal pump impeller ring structure, which solves the problem of excessive impeller ring leakage on the basis of ensuring that the impeller will not jam.

[0005] To solve the above technical problems, the utility model provides a centrifugal pump impeller ring structure, including:

[0006] A volute provided with a volute opening;

[0007] An impeller disposed within the volute opening, the impeller including a plurality of blades and the plurality of blades jointly extending to an impeller stop, an impeller ring extending outward from an outer end of the impeller stop, and a stepped structure being formed between the impeller ring and the impeller stop;

[0008] Wherein, a circular groove for the impeller ring to extend into is formed on an inner wall surface of the volute near the volute opening, the impeller ring and the circular groove are in clearance fit, and a gap is formed between the stepped structure and the inner wall surface of the volute.

[0009] In an embodiment of the utility model, an external impeller ring gap is formed between an outer diameter of the impeller ring and the circular groove, an internal impeller ring gap is formed between an inner diameter of the impeller ring and the circular groove, an impeller top axial gap is formed between an axial outer end of the impeller ring and the circular groove, and an impeller stop axial gap is formed between the impeller stop and the inner wall surface of the volute.

[0010] In an embodiment of the utility model, the external impeller ring gap and the internal impeller ring gap are of the same size.

[0011] In an embodiment of the utility model, the impeller top axial gap and the impeller stop axial gap are of the same size.

[0012] In an embodiment of the utility model, the impeller ring is in a circular ring shape.

[0013] In an embodiment of the present utility model, the cross-section of the impeller ring is rectangular.

[0014] In an embodiment of the present utility model, the cross-section of the annular groove is rectangular.

[0015] The above technical solution of the present utility model has the following advantages compared with the prior art:

[0016] For a centrifugal pump impeller ring structure of the present utility model, by opening an annular groove on the inner wall surface of the volute, expanding the outer diameter of the impeller ring at the opening of the impeller, and setting a stepped structure at the inner diameter, the leakage of the impeller ring can be effectively reduced. The design of the annular groove enables the high-pressure liquid to pass through the external impeller ring gap, the axial clearance at the top of the impeller, the internal impeller ring gap, and the axial clearance of the impeller stop, and then compensate for the local low-pressure area near the leading edge of the blade, thereby reducing the leakage amount and improving the efficiency of the pump. At the same time, it ensures that the impeller will not get stuck during operation. This design not only ensures the free rotation of the impeller but also avoids the risk of equipment damage and shutdown caused by jamming.

[0017] The present utility model ensures that the centrifugal pump can maintain good working performance under different working conditions by reasonably setting the sizes of the external impeller ring gap and the internal impeller ring gap, and determining the axial clearance at the top of the impeller and the axial clearance of the impeller stop according to the process conditions and the axial movement of the rotor. This flexible design is applicable to various types of centrifugal pumps and has strong versatility and adaptability. BRIEF DESCRIPTION OF THE DRAWINGS

[0018] In order to make the content of the present utility model easier to be clearly understood, the following further detailed description of the present utility model is made in combination with the specific embodiments of the present utility model and the accompanying drawings.

[0019] Figure 1 is the overall structural sectional view of the centrifugal pump impeller ring structure of the present utility model.

[0020] Figure 2 is Figure 1 the partially enlarged schematic view of

[0021] Figure 3 is the structural schematic view of the impeller of the present utility model.

[0022] Figure 4 is the structural schematic view of the volute of the present utility model.

[0023] Description of the reference numerals in the drawings of the specification:

[0024] 1. Volute; 2. Impeller; 3. Inlet edge; 4. Impeller ring; 5. Impeller stop; 6. Annular groove; 7. Inner wall surface of volute; 8. External gland clearance; 9. Internal gland clearance; 10. Axial clearance at the top of impeller; 11. Axial clearance of impeller stop. Detailed implementation mode

[0025] The present utility model will be further described below in conjunction with the accompanying drawings and specific embodiments, so that those skilled in the art can better understand the present utility model and be able to implement it, but the embodiments cited do not limit the present utility model.

[0026] In the present utility model, when directions (up, down, left, right, front and back) are described, it is only for the convenience of describing the technical solution of the present utility model, rather than indicating or implying that the technical features referred to must have a specific orientation, be constructed and operated in a specific orientation, and therefore should not be construed as a limitation of the present utility model.

[0027] In the present utility model, the meaning of "several" is one or more, the meaning of "multiple" is two or more, and understandings such as "greater than", "less than", "exceeding" do not include the present number; understandings such as "above", "below", "within" include the present number. In the description of the present utility model, if "first" and "second" are described, they are only for the purpose of distinguishing technical features, and cannot be understood as indicating or implying relative importance or implicitly indicating the quantity of the indicated technical features or implicitly indicating the sequence relationship of the indicated technical features.

[0028] In the present utility model, unless otherwise clearly defined, words such as "set", "installed", "connected" should be understood in a broad sense. For example, they can be directly connected, or indirectly connected through an intermediate medium; they can be fixedly connected, or detachably connected, and can also be integrally formed; they can be mechanically connected, or electrically connected or capable of communicating with each other; they can be the communication inside two components or the interaction relationship between two components. Those skilled in the art can reasonably determine the specific meanings of the above words in the present utility model in combination with the specific content of the technical solution.

[0029] Refer to Figures 1 to 4 As shown, a gland structure of a centrifugal pump of the present utility model includes:

[0030] A volute 1 provided with a volute opening;

[0031] An impeller 2 disposed in the volute opening. The impeller 2 includes a plurality of blades, and the plurality of blades jointly extend to an impeller stop 5. An impeller ring 4 extends outward from the outer end of the impeller stop 5, and a stepped structure is formed between the impeller ring 4 and the impeller stop 5;

[0032] Among them, an annular groove 6 for the impeller ring 4 to extend into is provided on the inner wall surface 7 of the volute 1 near the opening of the volute. The impeller ring 4 is in clearance fit with the annular groove 6, and a clearance is formed between the stepped structure and the inner wall surface 7 of the volute.

[0033] In one embodiment, an external gland clearance 8 is formed between the outer diameter of the impeller ring 4 and the annular groove 6, an internal gland clearance 9 is formed between the inner diameter of the impeller ring 4 and the annular groove 6, an impeller top axial clearance 10 is formed between the axial outer end of the impeller ring 4 and the annular groove 6, and an impeller stop axial clearance 11 is formed between the impeller stop 5 and the inner wall surface 7 of the volute.

[0034] A necessary gland clearance is formed between the volute 1 and the impeller 2, and it has a structure similar to a labyrinth seal. Based on this gland clearance, the gland leakage is small, and at the same time, the cavitation performance of the centrifugal pump is improved.

[0035] In one embodiment, the external gland clearance 8 and the internal gland clearance 9 are of the same size, and the specific value is determined according to the process conditions.

[0036] In one embodiment, the impeller top axial clearance 10 and the impeller stop axial clearance 11 are of the same size, which is determined according to the axial movement of the entire rotor.

[0037] In one embodiment, the impeller ring 4 is circular.

[0038] In one embodiment, the cross-section of the impeller ring 4 is rectangular.

[0039] In one embodiment, the cross-section of the annular groove 6 is rectangular (or U-shaped).

[0040] The above structure is simple, convenient for manufacturing and processing, can be realized by using existing materials and manufacturing processes, and reduces the production cost and technical difficulty.

[0041] By providing the annular groove 6 on the inner wall surface 7 of the volute, the gland outer diameter at the opening of the impeller 2 is enlarged, and a stepped structure is provided at the inner diameter. The impeller stop 5 is close to the inlet edge 3 of the blade.

[0042] During operation, under the guiding action of the annular groove 6, the high-pressure liquid in the pump chamber passes through the external gland clearance 8, the impeller top axial clearance 10, the internal gland clearance 9, and the impeller stop axial clearance 11, compensates the local low-pressure area near the inlet edge 3 of the blade, and then flows through the impeller 2 flow channel to the pump chamber. This not only reduces the gland leakage but also improves the cavitation performance of the pump.

[0043] Finally, it should be noted that the above specific embodiments are only used to illustrate the technical solutions of the present utility model and not to limit them. Although the present utility model has been described in detail with reference to the examples, those of ordinary skill in the art should understand that the technical solutions of the present utility model can be modified or equivalently replaced without departing from the spirit and scope of the technical solutions of the present utility model, and they should all be covered within the scope of the claims of the present utility model.

Claims

1. A centrifugal pump mouth ring structure, characterized in that: include: A volute (1) provided with a volute opening; An impeller (2) is arranged in the volute opening, the impeller (2) comprises a plurality of blades and the plurality of blades extend together to an impeller stop (5), an impeller ring (4) extends outwardly from the outer end of the impeller stop (5), and a step structure is formed between the impeller ring (4) and the impeller stop (5); The volute (1) is provided with an annular groove (6) for the impeller ring (4) to extend into on the volute inner wall surface (7) near the volute opening, the impeller ring (4) and the annular groove (6) are gap-matched, and a gap is formed between the step structure and the volute inner wall surface (7).

2. A centrifugal pump mouth ring structure according to claim 1, characterized in that: An external ring gap (8) is formed between the outer diameter of the impeller ring (4) and the annular groove (6), an internal ring gap (9) is formed between the inner diameter of the impeller ring (4) and the annular groove (6), an impeller top axial gap (10) is formed between the axial outer end of the impeller ring (4) and the annular groove (6), and an impeller stop axial gap (11) is formed between the impeller stop (5) and the inner wall surface (7) of the volute.

3. A centrifugal pump mouth ring structure according to claim 2, characterized in that: The outer mouth ring gap (8) and the inner mouth ring gap (9) are of the same size.

4. A centrifugal pump mouth ring structure according to claim 2, characterized in that: The impeller top axial clearance (10) and the impeller stop axial clearance (11) are of the same size.

5. A centrifugal pump mouth ring structure according to claim 1, characterized in that: The impeller ring (4) is in the shape of a circular ring.

6. A centrifugal pump mouth ring structure according to claim 5, characterized in that: The cross section of the impeller ring (4) is rectangular.

7. A centrifugal pump port ring structure according to claim 6, characterized in that: The cross section of the annular groove (6) is rectangular.

Images