A BB1 pump

Abstract

The utility model relates to a kind of BB1 pumps, including pump shell, impeller and sealing ring, the water inlet channel is formed in the pump shell, the impeller is located in the pump shell, the sealing ring is installed between the pump shell and the impeller, the sealing ring inlet end is formed with hook edge structure, the hook edge structure is tangent with the pump shell inner wall, to make the sealing ring and the water inlet channel of the pump shell smoothly link;The impeller and the sealing ring interface are formed with arc structure, the arc structure is tangent with the hook edge structure profile;Through being set in the sealing ring inlet end and the hook edge structure of pump shell inner wall tangency, the smooth transition of water inlet channel is realized, effectively eliminates the eddy current and impact loss of traditional ladder link-up place;By setting the arc structure that the hook edge profile is tangent with in the impeller inlet end, the stable introduction of liquid to impeller is realized, and inlet impact and eddy current phenomenon are significantly reduced.

Description

Technical Field

[0001] This utility model belongs to the field of BB1 pumps, and specifically designs a BB1 pump. Background Technology

[0002] The pump impeller is a rotating component, while the pump casing is a non-rotating component. After the liquid passes through the impeller, the pressure inside the cavity formed by the impeller and pump casing increases, creating a significant pressure difference with the inlet. Therefore, some liquid will inevitably enter the inlet through the gap between the impeller and the pump casing, causing internal leakage. Thus, the gap between the pump and impeller must be minimized to reduce leakage. However, a smaller gap also makes the impeller and pump casing more prone to collisions during operation. Furthermore, due to cost constraints, the pump casing and impeller are likely made of the same material or materials with similar hardness, such as the common HT250, QT500-7, and ZG230-450. These materials are prone to seizing after collisions, leading to the scrapping of the pump casing or impeller. Therefore, a sealing ring is installed on the pump casing. Because the sealing ring has a simple shape and low cost, it can be made of a material with higher hardness than the pump casing and impeller. After the impeller and sealing ring collide, a portion of the impeller is worn away, preventing seizing and thus not affecting operation, significantly reducing maintenance costs.

[0003] In existing connections between sealing rings and pump bodies, the connections between sealing rings and pump bodies and impellers are mostly stepped, non-smooth connections. This causes fluid to be blocked by the steps when entering the impeller, resulting in large eddies and losses, which affects the pump's efficiency and anti-cavitation performance. Utility Model Content

[0004] In order to solve the above-mentioned problems in the existing technology, the purpose of this utility model is to provide a BB1 pump.

[0005] The technical solution adopted by this utility model includes a pump casing, an impeller, and a sealing ring. A water inlet channel is formed inside the pump casing. The impeller is disposed inside the pump casing. The sealing ring is installed between the pump casing and the impeller. The inlet end of the sealing ring has a hooked edge structure, which is tangent to the inner wall of the pump casing to ensure a smooth connection between the sealing ring and the water inlet channel of the pump casing. An arc structure is formed at the junction of the impeller and the sealing ring, and the arc structure is tangent to the contour of the hooked edge structure.

[0006] In a preferred embodiment of this invention, the sealing ring has a recessed groove, the impeller inlet end is embedded in the recessed groove, and a gap is formed between the impeller inlet end and the recessed groove.

[0007] In a preferred embodiment of this invention, the hook edge extends outward from the inlet end of the sealing ring toward the outlet end to the leading edge of the impeller blade inlet edge.

[0008] As a preferred embodiment of this invention, the sealing ring hook structure is integrally formed or separately connected to the sealing ring body.

[0009] As a preferred embodiment of this invention, the sealing ring is made of a material with a hardness higher than that of the pump casing and impeller.

[0010] In a preferred embodiment of this invention, the sealing ring is fixed to the pump casing by a boss or a pin.

[0011] In a preferred embodiment of this invention, the radius of curvature of the arc structure at the impeller inlet matches the radius of curvature of the sealing ring hook structure.

[0012] In a preferred embodiment of this invention, the pump casing has an axially split structure, comprising a pump body and a pump cover.

[0013] As a preferred embodiment of this invention, the connection between the hook edge structure of the sealing ring and the inner wall of the pump casing has no step-like abrupt change.

[0014] The beneficial effects of this utility model are as follows:

[0015] This utility model, as a BB1 pump, achieves a smooth transition in the inlet flow channel by using a hook-edge structure tangent to the inner wall of the pump casing at the inlet end of the sealing ring, effectively eliminating eddy currents and impact losses at traditional stepped joints. Furthermore, by providing an arc structure tangent to the hook-edge contour at the impeller inlet end, it achieves smooth liquid introduction into the impeller, significantly reducing inlet impact and eddy current phenomena. The smooth transition between the arc structure and the hook-edge structure improves pump efficiency and cavitation resistance. Attached Figure Description

[0016] The present invention will now be described in further detail with reference to the accompanying drawings and specific implementation methods.

[0017] Figure 1 This is a schematic diagram of the structure of this utility model;

[0018] Figure 2 This is a utility model Figure 1 Enlarged structural diagram at point A in the diagram;

[0019] Figure 3 This is a schematic diagram of the prior art of this utility model;

[0020] Figure 4 This is a utility model Figure 3 Enlarged structural diagram at point B.

[0021] Explanation of reference numerals in the attached figures:

[0022] 1. Pump casing;

[0023] 2 impellers, 21 circular arc structure;

[0024] 3 sealing ring, 31 hook edge structure, 32 recessed groove, 33 boss;

[0025] 4. Water inlet channel. Detailed Implementation

[0026] To make the objectives, technical solutions, and advantages of this utility model clearer, the present utility model will be further described in detail below with reference to the accompanying drawings and embodiments. It should be understood that the specific embodiments described herein are only for explaining the present utility model and are not intended to limit the present utility model; that is, the described embodiments are only some embodiments of the present utility model, and not all embodiments. The components of the embodiments of the present utility model described and shown in the accompanying drawings can generally be arranged and designed in various different configurations.

[0027] Therefore, the following detailed description of the embodiments of the present invention provided in the accompanying drawings is not intended to limit the scope of the claimed invention, but merely to illustrate selected embodiments of the invention. All other embodiments obtained by those skilled in the art based on the embodiments of the present invention without inventive effort are within the scope of protection of the present invention.

[0028] The following is combined Figure 1-4 This invention describes a specific embodiment of a BB1 pump, comprising: a pump casing 1, an impeller 2, and a sealing ring 3. The pump casing 1 has an inlet channel 4. The impeller 2 is disposed within the pump casing 1. The sealing ring 3 is installed between the pump casing 1 and the impeller 2. The inlet end of the sealing ring 3 has a hooked edge structure 31, which is tangent to the inner wall of the pump casing 1, allowing for a smooth connection between the sealing ring 3 and the inlet channel 4 of the pump casing 1. An arcuate structure 21 is formed at the junction of the impeller 2 and the sealing ring 3, and the arcuate structure 21 is tangent to the contour of the hooked edge structure 31. By forming a hooked edge structure 31 on the sealing ring 3 and making it tangent to the inner wall of the pump casing 1, the sealing ring 3 is smoothly connected to the inlet channel 4 of the pump casing 1, eliminating the step or protrusion 33 commonly found at the inlet of the sealing ring 3 in traditional structures. Figure 4 (marked at point C) This design allows the inlet channel 4 of the pump casing 1 to smoothly transition to the surface of the sealing ring 3, avoiding eddies and impact losses caused by abrupt changes in the inlet channel 4 at this point. By forming an arc structure 21 on the impeller 2, the arc between the inlet end of the impeller 2 and the sealing ring 3 is tangent, ensuring that the liquid is smoothly introduced from the stationary pump casing 1 / sealing ring 3 component into the rotating impeller 2. The arc at the inlet of the impeller 2 acts as a guide, directing the liquid to enter the impeller 2 blades at the optimal angle of attack, greatly reducing the impact losses and eddies caused by the liquid hitting the inlet edge of the impeller 2, and avoiding the stepped structure at the inlet of the impeller 2 in traditional structures. Figure 4(Point D) affects the smooth flow of fluid; the arc structure 21 on the impeller 2 is tangent to the hooked edge structure 31 on the sealing ring 3, which significantly optimizes the hydraulic design of the pump inlet section, improves pump efficiency, and reduces the risk of cavitation by reducing eddies and impacts, thereby enhancing the pump's anti-cavitation performance. In this application, referring to the attached drawings, the flow direction of the inlet channel 4 is from the low-pressure area to the high-pressure area as indicated in the figure.

[0029] Please refer to Figures 1-2 As shown, the sealing ring 3 has a recessed groove 32. The inlet end of the impeller 2 is embedded in the recessed groove 32, and a gap is formed between the impeller 2 and the recessed groove 32. The recessed groove 32 provides a narrow space for the connection of the impeller 2. When the liquid in the high-pressure area passes through this gap, it will undergo multiple expansions, contractions and changes of direction, thereby gradually dissipating the pressure energy of the liquid through friction, effectively preventing a large amount of liquid from flowing back from the high-pressure area to the low-pressure area.

[0030] Please refer to Figure 2 As shown, the hook edge extends outward from the inlet end of the sealing ring 3 towards the outlet end to the leading edge of the impeller 2 blade inlet edge. The pre-swirl and flow state of the liquid before entering the impeller 2 blade directly determines the magnitude of the inlet loss. The hook edge extending to the leading edge of the blade inlet edge provides undisturbed guidance for the liquid before entering the impeller 2, ensuring that the entire transition area from the pump casing 1 to the impeller 2 remains streamlined and smooth, minimizing any possible flow separation and eddies that may occur in this area, and creating conditions for the impeller 2 to perform efficient work.

[0031] Please refer to Figure 1 As shown, the sealing ring 3 hook structure 31 is integrally formed or separately connected to the sealing ring 3 body. In the first embodiment of the sealing ring 3 and the hook structure 31, the sealing ring 3 and the hook structure 31 are integrally formed, which improves the structural strength, avoids assembly gaps, and improves fluid flow. In the second embodiment of the sealing ring 3 and the hook structure 31, the manufacturing difficulty and cost can be reduced by adopting a separate fixed connection.

[0032] Please refer to Figures 1-2 As shown, the sealing ring 3 has a higher material hardness than the pump casing 1 and impeller 2. When the impeller 2 comes into contact with the sealing ring 3 during startup, shutdown, or shaft vibration, the sealing ring 3, which has a higher hardness, will wear down the impeller 2's mouth ring, which has a lower hardness. Since the sealing ring 3 is low-cost and easy to replace, while the impeller 2 is expensive and complex to replace, this design ensures that damage occurs with the sealing ring 3. This significantly reduces maintenance costs and downtime, protects the impeller 2 and pump body from damage, and improves the reliability and economy of the pump unit.

[0033] Please refer to Figures 1-2As shown, the sealing ring 3 is fixed to the pump casing 1 by a boss 33 or a pin; fixing the sealing ring 3 to the pump casing 1 by the boss 33 or the pin can prevent the sealing ring 3 from rotating circumferentially under the action of high-speed fluid or when it rubs slightly with the impeller 2, ensuring that it always maintains the correct relative position with the pump casing 1, thereby ensuring that the designed clearance and flow pattern are not destroyed.

[0034] Please refer to Figure 2 As shown, the radius of curvature of the arc structure 21 at the inlet of the impeller 2 matches the radius of curvature of the hook structure 31 of the sealing ring 3. By matching the radii of curvature of the two, the degree of curvature of the connecting section of the sealing ring 3 and the impeller 2 profile is continuously varied, which can achieve a linear smooth transition, further optimize the fluid dynamics performance, make the flow smoother, and minimize any small flow disturbances.

[0035] Please refer to Figure 1 As shown, the pump casing 1 has an axially split structure, including the pump body and the pump cover; as an API standard pump type, the BB1 ​​pump's axially split structure facilitates maintenance, and the pump cover can be opened to inspect or replace internal parts without disassembling the inlet and outlet pipes.

[0036] Please refer to Figure 1 As shown, the connection between the hook structure 31 of the sealing ring 3 and the inner wall of the pump casing 1 has no step-like abrupt change, thus avoiding abrupt changes in fluid velocity and direction.

[0037] Working principle of this utility model:

[0038] Liquid flows in from the pump inlet, passes through the fluid input end of the pump casing 1, and reaches the inlet of the sealing ring 3. The hook edge of the sealing ring 3 inlet is smoothly tangent to the inner wall of the pump casing 1, eliminating the eddies and impacts caused by the traditional stepped structure, allowing the liquid to pass through undisturbed.

[0039] The arc at the inlet of impeller 2 is tangent to the outline of the sealing ring 3, forming a continuous streamlined channel that smoothly guides the liquid into the rotating impeller 2 and into the blade flow channel at the optimal angle, greatly reducing inlet impact loss.

[0040] Meanwhile, the inlet end of the impeller 2 is embedded in the recessed groove 32 of the sealing ring 3, forming a tiny gap and constituting a labyrinth seal, which effectively consumes the energy of the high-pressure liquid attempting to flow back and significantly reduces internal leakage.

[0041] In the description of this utility model, it should be noted that, unless otherwise explicitly specified and limited, the terms "installation," "connection," "joining," etc., should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral connection; they can refer to a mechanical connection or an electrical connection; they can refer to a direct connection or an indirect connection through an intermediate medium; and they can refer to the internal communication between two components. Those skilled in the art can understand the specific meaning of the above terms in this utility model based on the specific circumstances.

[0042] The above description is merely an example and illustration of the structure of this utility model. Those skilled in the art can make various modifications or additions to the specific embodiments described or use similar methods to replace them, as long as they do not deviate from the structure of the utility model or exceed the scope defined by the claims of this application, they should all fall within the protection scope of this utility model.

Claims

1. A BB1 pump, characterized in that, The pump includes a pump casing (1), an impeller (2), and a sealing ring (3). An inlet channel (4) is formed within the pump casing (1). The impeller (2) is disposed within the pump casing (1). The sealing ring (3) is installed between the pump casing (1) and the impeller (2). The pump is characterized by: The sealing ring (3) has a hooked edge structure (31) at its inlet end, which is tangent to the inner wall of the pump casing (1) so that the sealing ring (3) and the water inlet channel (4) of the pump casing (1) are smoothly connected; the impeller (2) has an arc structure (21) at the junction with the sealing ring (3), which is tangent to the outline of the hooked edge structure (31).

2. The BB1 ​​pump according to claim 1, characterized in that: The sealing ring (3) has a recessed groove (32), the inlet end of the impeller (2) is embedded in the recessed groove (32), and a gap is formed between the impeller (2) and the recessed groove (32).

3. The BB1 ​​pump according to claim 2, characterized in that: The hook edge extends outward from the inlet end of the sealing ring (3) toward the outlet end to the leading edge of the inlet edge of the impeller (2) blade.

4. The BB1 ​​pump according to claim 1, characterized in that: The sealing ring (3) hook structure (31) is integrally formed or separately connected to the sealing ring (3) body.

5. A BB1 pump according to claim 4, characterized in that: The sealing ring (3) has a higher material hardness than the pump casing (1) and impeller (2).

6. A BB1 pump according to claim 4, characterized in that: The sealing ring (3) is fixed to the pump casing (1) by a boss (33) or a pin.

7. A BB1 pump according to claim 1, characterized in that: The radius of curvature of the arc structure (21) at the inlet of the impeller (2) matches the radius of curvature of the hook structure (31) of the sealing ring (3).

8. A BB1 pump according to claim 1, characterized in that: The pump casing (1) has an axially split structure, including the pump body and the pump cover.

9. A BB1 pump according to claim 1, characterized in that: There is no step-like abrupt change at the connection between the hook structure (31) of the sealing ring (3) and the inner wall of the pump casing (1).

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