Vertical primary double-suction sectional condensate pump

Abstract

The utility model relates to condensate pump technical field, and specifically is a vertical first stage double suction sectional type condensate pump, including pump base, shaft, cylinder, first stage spiral shell, first stage double suction impeller, secondary impeller, last stage impeller, middle section, last stage middle section, wear, middle guide bearing, guide vane and guide vane cover, and the shunt type design of first stage double suction impeller divides the import total flow, and the single inlet flow rate is reduced greatly, and the device necessary net positive suction head drops significantly, simultaneously, the symmetrical liquid inlet mode stabilizes the inlet flow field, reduces the adverse flow of inducing cavitation, further promotes the anti-cavitation ability, and need not rely on lengthening cylinder to satisfy low net positive suction head demand, because of not needing lengthening cylinder, the overall length of pump body is greatly shortened, and the depth of matched pump pit can be reduced accordingly, the cost and period of civil construction are reduced significantly, and it is especially applicable to shallow pump pit construction scene.

Description

Technical Field

[0001] This utility model relates to the field of condensate pump technology, specifically to a vertical first-stage double-suction segmental condensate pump. Background Technology

[0002] In industrial production, condensate pumps are key equipment for transporting condensate, and their operational stability and economy directly affect the efficiency of the entire production system. Currently, most mainstream vertical condensate pumps on the market adopt a first-stage single-suction structure, which has a significant drawback: due to the concentrated inlet flow of the first-stage single-suction impeller, the equipment requires a high net positive suction head (NPSH).

[0003] To reduce net positive suction head (NPSH) and meet operational requirements, existing technologies often employ an extended pump body cylindrical design. However, this extended cylindrical design necessitates a deeper pump pit to accommodate the equipment, which significantly increases the cost and time of civil engineering construction. Furthermore, the increased overall height of the equipment leads to decreased operational stability, resulting in issues such as vibration and noise. This limits the application of vertical condensate pumps in shallow pump pit and low-cost construction scenarios.

[0004] Therefore, how to effectively reduce the net positive suction head (NPSH) of vertical condensate pumps without relying on an extended cylindrical body, while reducing construction costs and improving equipment stability, has become a pressing technical problem to be solved in this field. Utility Model Content

[0005] The main objective of this invention is to provide a vertical first-stage double-suction segmental condensate pump that can effectively solve the problems in the background technology.

[0006] To achieve the above objectives, the technical solution adopted by this utility model is as follows: A vertical, first-stage double-suction segmental condensate pump includes a pump base, shaft, cylindrical body, first-stage spiral casing, first-stage double-suction impeller, secondary impeller, final-stage impeller, intermediate section, final-stage intermediate section, through rod, central guide bearing, guide vanes, and guide vane sleeves. The top of the pump base is fixedly connected to the final-stage intermediate section. At least one intermediate section and the cylindrical body are sequentially connected vertically to the top of the final-stage intermediate section. The through rod sequentially passes through the cylindrical body, intermediate section, and final-stage intermediate section vertically, with the lower end of the through rod fixed to the pump base. The cylindrical body is fixedly connected; a first-stage spiral shell is fixedly installed inside the first-stage spiral shell, and a first-stage double-suction impeller is adapted to be installed inside the first-stage spiral shell; a middle guide bearing and a first-stage double-suction impeller are sequentially installed at the upper end of the shaft and are connected to the first-stage double-suction impeller in a driving connection; at least one secondary impeller is installed in the middle part of the shaft; a final-stage impeller is installed at the lower end of the shaft, and the final-stage impeller is located inside the middle section of the final stage; a guide vane is fixedly installed inside the middle section, and a guide vane sleeve is fitted on the outside of the guide vane, and the outer wall of the guide vane sleeve is in contact with the inner wall of the middle section.

[0007] Specifically, the blades of the first-stage double-suction impeller are designed for flow splitting. The flow splitting blades can divide the total inlet flow into two parts and introduce them into the two inlets of the first-stage double-suction impeller respectively, thereby reducing the fluid velocity at a single inlet.

[0008] Specifically, the central guide bearing is fixedly installed at the connection between the cylindrical body and the middle section, and the inner ring of the central guide bearing is interference-fitted with the shaft, while the outer ring of the central guide bearing is fixedly connected to the inner wall of the cylindrical body.

[0009] Specifically, the inner ring of the guide vane is clearance-fitted with the shaft, the inner wall of the guide vane sleeve is interference-fitted with the outer wall of the guide vane, and the height of the guide vane sleeve is consistent with the height of the middle section.

[0010] Specifically, the final stage impeller is connected to the shaft drive via a flat key, the inner wall of the middle section of the final stage is provided with a fluid channel adapted to the final stage impeller, and the middle section of the final stage is detachably connected to the pump base via bolts.

[0011] Specifically, the number of secondary impellers is 2-4, and each secondary impeller is arranged in an axial sequence with equal spacing along the shaft, and each secondary impeller corresponds to a guide vane in the middle section.

[0012] The beneficial effects of this utility model are: The first-stage double-suction impeller of this utility model features a flow-dividing design that evenly distributes the total inlet flow, significantly reducing the velocity at each inlet and consequently lowering the required net positive suction head (NPSH). Simultaneously, the symmetrical inlet feeding method stabilizes the inlet flow field, reducing cavitation-inducing adverse flow patterns and further enhancing cavitation resistance. It can meet low NPSH requirements without relying on an extended cylindrical body. Because no extended cylindrical body is needed, the overall pump body length is significantly shortened, allowing for a corresponding reduction in the depth of the pump pit, significantly reducing the cost and time required for civil engineering construction, making it particularly suitable for shallow pump pit construction scenarios. Attached Figure Description

[0013] The present invention will be further described below with reference to the accompanying drawings and embodiments.

[0014] Figure 1 This is a schematic diagram of the structure of this utility model; In the figure: 1-cylinder body, 2-first-stage double-suction impeller, 3-first-stage spiral shell, 4-middle guide bearing, 5-through bar, 6-middle section, 7-guide vane sleeve, 8-last-stage middle section, 9-pump base, 10-shaft, 11-guide vane, 12-last-stage impeller, 13-secondary impeller. Detailed Implementation

[0015] To make the technical means, creative features, objectives and effects of this utility model easier to understand, the present utility model will be further described below in conjunction with specific embodiments.

[0016] As one embodiment of this utility model, such as Figure 1 As shown, the vertical first-stage double-suction segmental condensate pump of this utility model is mainly composed of a cylindrical body 1, a first-stage double-suction impeller 2, a first-stage spiral shell 3, a middle guide bearing 4, a through bar 5, a middle section 6, a guide vane sleeve 7, a final-stage middle section 8, a pump base 9, a shaft 10, a guide vane 11, a final-stage impeller 12, and a secondary impeller 13.

[0017] The pump base 9 provides support for the entire equipment, and its top is detachably connected to the final stage intermediate section 8 by bolts. The top of the final stage intermediate section 8 is connected to at least one intermediate section 6 and the cylindrical body 1 in sequence along the vertical direction to form a segmented pump body structure. The through rod 5 passes through the cylindrical body 1, intermediate section 6 and final stage intermediate section 8 in the vertical direction, and the lower end of the through rod 5 is fixedly connected to the pump base 9. The tensioning effect of the through rod 5 ensures the sealing and coaxiality of each section of the pump body.

[0018] The cylindrical body 1 has a first-stage spiral shell 3 fixedly installed inside, and a first-stage double-suction impeller 2 is fitted inside the first-stage spiral shell 3. The blades of the first-stage double-suction impeller 2 adopt a flow-dividing design, which can divide the total inlet flow into two parts and introduce them into their two inlets respectively, significantly reducing the fluid velocity at a single inlet. The upper end of the shaft 10 is sequentially connected to the first-stage double-suction impeller 2 through a central guide bearing 4 and the first-stage double-suction impeller 2 via a flat key transmission, ensuring that the shaft 10 drives the impeller to rotate synchronously.

[0019] The guide bearing 4 is fixedly installed at the connection between the cylindrical body 1 and the middle section 6. The inner ring of the guide bearing 4 is interference-fitted with the shaft 10, and the outer ring is fixedly connected to the inner wall of the cylindrical body 1. It is used to limit the radial runout of the shaft 10 and improve the operational stability. The middle section 6 is fixedly provided with a guide vane 11. A guide vane sleeve 7 is sleeved on the outside of the guide vane 11. The outer wall of the guide vane sleeve 7 fits against the inner wall of the middle section 6, and the height of the guide vane sleeve 7 is the same as the height of the middle section 6. The inner ring of the guide vane 11 is clearance-fitted with the shaft 10, and the inner wall of the guide vane sleeve 7 is interference-fitted with the outer wall of the guide vane 11. The guide vane 11 is used to guide the fluid flow and reduce fluid energy loss.

[0020] At least one secondary impeller 13 is assembled in the middle of the shaft 10. The number of secondary impellers 13 is preferably 2-4. Each secondary impeller 13 is arranged in a equidistant order along the axial direction of the shaft 10, and each secondary impeller 13 corresponds to a guide vane 11 in the middle section 6. The fluid pressure is gradually increased through the multi-stage impellers. The lower end of the shaft 10 is connected to the final stage impeller 12 through a flat key. The final stage impeller 12 is located inside the final stage middle section 8. The inner wall of the final stage middle section 8 is provided with a fluid channel adapted to the final stage impeller 12 for discharging the fluid after multi-stage pressurization out of the pump body.

[0021] It should be noted that this utility model is a vertical first-stage double-suction segmental condensate pump. Condensate enters from the inlet of the cylindrical body 1 and first flows into the first-stage spiral shell 3. The shaft 10 rotates under the drive of an external drive device, such as a motor, which synchronously drives the first-stage double-suction impeller 2 to rotate. The diverting blades of the first-stage double-suction impeller 2 divide the total inlet flow into two parts, which are respectively introduced into the two inlets of the impeller. The flow velocity at a single inlet is reduced to 1 / 2 of the original single-suction structure. The fluid, after being pressurized by the first-stage double-suction impeller 2, is guided through the first-stage spiral shell 3 to the guide vanes 11 in the middle section 6. The guide vanes 11 convert the kinetic energy of the fluid into pressure energy and guide the fluid into the next stage secondary impeller 13. The three secondary impellers 13 pressurize the fluid in sequence, and the fluid pressure gradually increases. The fluid, after being finally pressurized by the secondary impellers 13, enters the fluid channel in the final stage middle section 8. After being further pressure-stabilized by the final stage impeller 12, it is discharged from the outlet of the final stage middle section 8, completing the condensate transportation process.

[0022] The foregoing has shown and described the basic principles, main features, and advantages of this utility model. Those skilled in the art should understand that this utility model is not limited to the above embodiments. The descriptions of the above embodiments and specifications are merely illustrative of the principles of this utility model. Various changes and modifications can be made to this utility model without departing from its spirit and scope, and all such changes and modifications fall within the scope of protection claimed by this utility model. The scope of protection of this utility model is defined by the appended claims and their equivalents.

Claims

1. A vertical first-stage double-suction segmental condensate pump, characterized in that, It includes a pump base (9), shaft (10), cylindrical body (1), first-stage spiral shell (3), first-stage double-suction impeller (2), secondary impeller (13), last-stage impeller (12), middle section (6), last-stage middle section (8), through bar (5), middle guide bearing (4), guide vane (11) and guide vane sleeve (7); The top of the pump base (9) is fixedly connected to the final stage middle section (8), and the top of the final stage middle section (8) is connected to at least one middle section (6) and a cylindrical body (1) in sequence along the vertical direction. The through rod (5) passes through the cylindrical body (1), the middle section (6), and the final stage middle section (8) in sequence along the vertical direction, and the lower end of the through rod (5) is fixedly connected to the pump base (9). The cylindrical body (1) is fixedly provided with a first-stage spiral shell (3), and the first-stage double suction impeller (2) is adapted to be installed inside the first-stage spiral shell (3). The upper end of the shaft (10) is sequentially connected to the middle guide bearing (4) and the first-stage double suction impeller (2), and is driven by the first-stage double suction impeller (2). At least one secondary impeller (13) is assembled in the middle of the shaft (10), and the lower end of the shaft (10) is assembled with the final stage impeller (12), and the final stage impeller (12) is located inside the middle section (8) of the final stage. The middle section (6) is fixedly provided with a guide vane (11), and a guide vane sleeve (7) is sleeved on the outside of the guide vane (11). The outer wall of the guide vane sleeve (7) is attached to the inner wall of the middle section (6).

2. The vertical first-stage double-suction segmental condensate pump according to claim 1, characterized in that, The blades of the first-stage double-suction impeller (2) are designed for splitting the flow. The splitting blades can divide the total inlet flow into two parts and introduce them into the two inlets of the first-stage double-suction impeller (2) respectively, thereby reducing the fluid velocity at a single inlet.

3. The vertical first-stage double-suction segmental condensate pump according to claim 2, characterized in that, The central guide bearing (4) is fixedly installed at the connection between the cylindrical body (1) and the middle section (6), and the inner ring of the central guide bearing (4) is interference-fitted with the shaft (10), and the outer ring of the central guide bearing (4) is fixedly connected to the inner wall of the cylindrical body (1).

4. The vertical first-stage double-suction segmental condensate pump according to claim 3, characterized in that, The inner ring of the guide vane (11) is clearance-fitted with the shaft (10), the inner wall of the guide vane sleeve (7) is interference-fitted with the outer wall of the guide vane (11), and the height of the guide vane sleeve (7) is consistent with the height of the middle section (6).

5. The vertical first-stage double-suction segmental condensate pump according to claim 4, characterized in that, The final stage impeller (12) is connected to the shaft (10) via a key. The inner wall of the final stage middle section (8) is provided with a fluid channel adapted to the final stage impeller (12), and the final stage middle section (8) is detachably connected to the pump base (9) via bolts.

6. The vertical first-stage double-suction segmental condensate pump according to claim 5, characterized in that, The number of secondary impellers (13) is 2-4. Each secondary impeller (13) is arranged in an equidistant order along the axial direction of the shaft (10), and each secondary impeller (13) corresponds to a guide vane (11) in the middle section (6).

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