Two-stage double suction pump

Abstract

The utility model discloses a two-stage double-suction pump, which belongs to the technical field of industrial pumps and comprises a volute, a flow dividing cavity, a power shaft, a first impeller and a second impeller, the first impeller and the second impeller are coaxially arranged on the outer side of the power shaft, the first impeller is communicated with a flow inlet, and the second impeller is communicated with a flow outlet; a flow dividing cavity is formed between the first impeller and the second impeller for communication, and the flow dividing cavity is used for distributing fluid to the two sides of the second impeller. The double-suction impellers are coaxially arranged, the flow dividing cavity is formed between the two impellers for communication, fluid at the position of the first impeller can be evenly distributed to the two sides of the liquid inlet of the second impeller through the flow dividing cavity, it is ensured that the flow of the fluid on the two sides of the second impeller is the same, axial force balance is achieved, and the service life is prolonged.

Description

Technical Field

[0001] This application relates to the field of industrial pump technology, and in particular to a two-stage double-suction pump. Background Technology

[0002] Double-suction pumps are widely used in water conservancy, chemical and other fields due to their high flow rate and low vibration characteristics. A two-stage double-suction pump is a centrifugal pump composed of two stages of double-suction impellers connected in series. The two impellers are axially connected in series on the same pump shaft. Fluid passes sequentially through the first-stage impeller and the second-stage impeller. Each impeller performs work on the fluid, increasing its pressure. Each impeller employs a double-suction structure (i.e., liquid is simultaneously drawn in from both sides of the impeller). However, when fluid flows from the first-stage impeller to the second-stage impeller, the flow rates drawn in from both sides of the second-stage impeller differ, generating additional axial force. This leads to accelerated wear of components and a shortened service life. Utility Model Content

[0003] To address the aforementioned technical problems, this application provides a two-stage double-suction pump. Through a two-stage double-suction impeller and a symmetrical flow-dividing cavity design, axial force balance is achieved, extending service life. The technical solution is as follows:

[0004] A two-stage double-suction pump includes a volute and a drive shaft, as well as a first impeller and a second impeller within the volute;

[0005] The first impeller and the second impeller are coaxially arranged outside the power shaft, with the first impeller connected to the inlet and the second impeller connected to the outlet.

[0006] A flow-dividing cavity is provided between the first impeller and the second impeller to communicate with each other. The flow-dividing cavity is used to distribute fluid to both sides of the second impeller.

[0007] Preferably, the flow divider includes a main flow channel connected to the first impeller and branch flow channels connected to both sides of the second impeller, wherein each branch flow channel is connected to the main flow channel.

[0008] Preferably, it further includes several flow guiding components, which are disposed in the flow distribution cavity to guide the fluid to be evenly distributed to both sides of the second impeller; at the same time, they can effectively suppress the rotation of the fluid during the flow process.

[0009] Preferably, the cross-sectional area of ​​the flow-dividing cavity is gradually decreasing. This effectively increases the fluid velocity and effectively suppresses the generation of eddies.

[0010] More preferably, the flow guiding components are evenly distributed within the flow distribution cavity. This prevents the flow from rotating during the flow process and guides the flow towards the branch channels.

[0011] Preferably, the inner wall of the diversion cavity is coated with a wear-resistant ceramic coating to improve its service life.

[0012] Preferably, the system further includes an adjustment component, which includes a detection component for detecting the fluid pressure within the branch cavity and an adjustment component for adjusting the flow pressure within the branch cavity. This reduces the pressure difference within the branch channel, ensuring that the inlet pressures on both sides of the second impeller remain consistent.

[0013] Compared with the prior art, the beneficial effects of this application are as follows:

[0014] The two impellers of this application are coaxially arranged, and a flow-dividing cavity is provided between the two impellers. The flow-dividing cavity can evenly distribute the fluid at the outlet of the first impeller to the two inlets of the second impeller, reduce the pressure difference of the fluid on both sides of the second impeller, and keep the flow rate consistent, so as to achieve axial force balance and extend service life. Attached Figure Description

[0015] Figure 1 This is a simplified schematic diagram of this application.

[0016] In the picture:

[0017] 10. Volute; 110. Inlet; 120. Outlet;

[0018] 20. First impeller; 30. Second impeller;

[0019] 40. Flow branch cavity; 410. Main flow channel; 420. Branch flow channel;

[0020] 50. Flow guiding component; 60. Adjustment component. Detailed Implementation

[0021] The technical solutions in the embodiments of this application will be clearly and completely described below with reference to the accompanying drawings. Obviously, the embodiments described in this application are only some embodiments of this application, and not all embodiments. Based on the embodiments in this application, all other embodiments obtained by those of ordinary skill in the art without creative effort are within the scope of protection of this application.

[0022] See Figure 1 To further describe this application in detail, a two-stage double-suction pump includes a volute 10, a power shaft and a flow divider 40, and a first impeller 20 and a second impeller 30 within the volute 10; wherein the first impeller 20 and the second impeller 30 are both double-suction structures, and the impellers can draw fluid in from both sides during operation.

[0023] The first impeller 20 and the second impeller 30 are coaxially disposed outside the power shaft. The first impeller 20 is connected to the inlet 110, and the second impeller 30 is connected to the outlet 120. A flow-dividing cavity 40 is provided between the first impeller 20 and the second impeller 30 to distribute fluid to both sides of the second impeller 30. In this embodiment, the flow-dividing cavity 40 is disposed inside the volute 10, and its inlet end is connected to the outlet of the first impeller 20. The outlet end of the flow-dividing cavity 40 is connected to a second-stage double inlet end.

[0024] The fluid is drawn in and pressurized by the first impeller 20 from the inlet 110, and then evenly distributed to both sides of the second impeller 30 by the diversion cavity 40. The second impeller 30 then draws in the fluid and discharges it from the outlet 120.

[0025] In this embodiment, the flow-dividing cavity 40 includes a main flow channel 410 connecting the first impeller 20 and branch flow channels 420 respectively connecting both sides of the second impeller 30, all of which are connected to the main flow channel 410. The flow-dividing cavity 40 is generally Y-shaped; the included angle between the branch flow channels 420 is 60° to 90°. The inner walls of the main flow channel 410 and the branch flow channels 420 have a smooth transition to reduce fluid resistance, and the branch flow channels 420 have the same diameter.

[0026] In this application, the first impeller 20 and the second impeller 30 are coaxially arranged, and the first impeller 20 and the second impeller 30 are connected by the flow-dividing cavity 40. The flow-dividing cavity 40 can evenly distribute the fluid at the outlet of the first impeller 20 to the two inlets of the second impeller 30, reduce the pressure difference of the fluid on both sides of the second impeller 30, and keep the flow rate consistent, so as to achieve axial force balance and extend service life.

[0027] The flow-dividing cavity 40 is further provided with several flow-guiding components 50. These flow-guiding components 50 are located within the flow-dividing cavity 40 and are used to guide the fluid to be evenly distributed to both sides of the inlet of the second impeller 30, while effectively suppressing the rotation of the fluid during flow. The flow-guiding components 50 can be guide blades, and the flow-guiding components 50 are in the form of an arc-shaped airfoil.

[0028] In this embodiment, the flow guiding components 50 are evenly distributed within the flow splitting cavity 40. Specifically, the flow guiding components 50 are evenly distributed circumferentially within the flow splitting cavity 40 at a 120° angle, and the height of each flow guiding component 50 is 1 / 3 of the diameter of the flow splitting cavity 40.

[0029] The cross-sectional area of ​​the flow-dividing cavity 40 is gradually decreasing. This increases the fluid velocity and effectively suppresses the generation of fluid eddies.

[0030] In this embodiment, the inner wall of the diversion cavity 40 is coated with a wear-resistant ceramic coating, which can effectively improve and extend its overall service life.

[0031] In some embodiments, the volute is further provided with an adjustment component 60, which includes a detection component for detecting the fluid pressure in the diversion cavity 40, and an adjustment component for adjusting the flow pressure in the diversion cavity 40. The detection component may be a pressure sensor for detecting the fluid pressure in the branch channel 420 and providing real-time feedback on the pressure difference in the branch channel 420; the adjustment component may be a regulating valve for adjusting its opening degree to adjust the pressure in the branch channel 420; in some embodiments, the volute 10 is provided with at least one pressure hole communicating with the branch channel 420, and the detection component is disposed within the pressure hole.

[0032] After startup, the fluid exiting the first impeller 20 is evenly distributed to the dual inlets of the second impeller 30 via the flow distribution cavity 40. The flow guiding component 50 can suppress fluid rotation. The pressure inside the flow distribution cavity 40 is detected in real time by the detection component. When the pressure deviation inside the flow distribution cavity 40 exceeds the threshold, the adjustment component can adjust the pressure inside the flow distribution cavity 40. The adjustment component automatically adjusts the opening to balance the flow rate.

Claims

1. A two-stage double-suction pump, characterized in that: It includes a volute and a drive shaft, as well as a first impeller and a second impeller within the volute; The first impeller and the second impeller are coaxially arranged outside the power shaft, with the first impeller connected to the inlet and the second impeller connected to the outlet. A flow-dividing cavity is provided between the first impeller and the second impeller to communicate with each other. The flow-dividing cavity is used to distribute fluid to both sides of the second impeller.

2. The two-stage double-suction pump according to claim 1, characterized in that: The flow divider includes a main flow channel connected to the first impeller and branch flow channels connected to both sides of the second impeller, and the branch flow channels are all connected to the main flow channel.

3. The two-stage double-suction pump according to claim 1, characterized in that: It also includes several flow guiding components, which are disposed in the flow distribution cavity and are used to guide the fluid to be evenly distributed to both sides of the second impeller.

4. The two-stage double-suction pump according to claim 1, characterized in that: The cross-sectional area of ​​the diversion cavity is gradually decreasing.

5. The two-stage double-suction pump according to claim 3, characterized in that: The flow guiding components are evenly distributed within the flow distribution cavity.

6. The two-stage double-suction pump according to claim 1, characterized in that: The inner wall of the diversion cavity is coated with a wear-resistant ceramic coating.

7. The two-stage double-suction pump according to claim 1, characterized in that: It also includes an adjustment component, which includes a detection component for detecting the fluid pressure in the diversion cavity and an adjustment component for adjusting the flow pressure in the diversion cavity.

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