Pump body structure capable of enabling centrifugal pump to realize bidirectional flow

Abstract

The pump body structure comprises a pump body main body and a reversing valve element, the pump body main body is connected with a system pipeline through two flanges, a flow channel is gradually divided into two parts in the direction from the flanges to the rotating center line of an impeller, and the two parts are connected with an inlet flow channel and an outlet flow channel of the impeller respectively. A reversing valve core is arranged at each of the two positions of the flow channel; the two ends of the reversing valve element extend out of the shaft heads, and the reversing valve element can be rotated through the shaft heads. By the adoption of the pump body structure, equipment in a two-way water flowing system can be reduced, the system reliability is improved, and the capital investment and the occupied area are reduced; two independent pump sets or multiple valves do not need to be arranged, two-way flowing can be achieved through the pump body structure, and the system structure is simplified.

Description

Technical Field

[0001] The present invention belongs to the field of fluid machinery, and in particular relates to a pump body structure capable of enabling a centrifugal pump to achieve bidirectional flow. Background Art

[0002] In engineering, there are many occasions where forward and reverse flow water systems are required, such as ship ballast water systems, heat exchange systems and water treatment systems that require backwashing. Common practices include the following:

[0003] (1) Set up two independent pump groups, two one-way valves, and auxiliary pipelines, such as Figure 1 As shown, two pumps are arranged in parallel, one for forward flow and the other for reverse flow. Each pump outlet is equipped with a check valve. When the forward pump is activated, the water in the system flows forward, while when the reverse pump is activated, the water in the system flows reversely. Additional valves are also configured in the system for easy maintenance. This system requires a lot of equipment, has low reliability, high capital investment, and occupies a large area.

[0004] (2) Set up a pump, four valves, and some auxiliary pipelines, such as Figure 2 As shown, the direction of water flow in the pipeline is changed by adjusting the valves. With valves 2 and 4 closed and valves 1 and 3 open, the pump starts, and the water flows in the forward direction. With valves 2 and 4 open and valves 1 and 3 closed, the pump starts, and the water flows in the reverse direction. While this configuration eliminates one pump, it adds two valves. However, it still has the disadvantages of requiring more system equipment, lowering reliability, increasing capital investment, and requiring a large floor space.

[0005] (3) Use a reverse-rotating axial flow pump. This system requires less equipment, is low-cost, and occupies a small area. However, the hydraulic performance is inconsistent or the vibration and noise are large during forward and reverse flow. In addition, the axial flow pump head itself is low, and it may not be able to achieve the hydraulic performance required by the system.

[0006] Through the above analysis, the current measures to achieve forward and reverse flow have certain limitations.

[0007] In addition, some existing centrifugal pump improvement technologies, such as the improved centrifugal pump disclosed in patent document (CN2318433Y), mainly improve the flow path to solve the packing leakage problem and reduce wear and power consumption. However, it cannot achieve bidirectional flow and can only transport fluid in one direction. The installation method is fixed, which limits its applicability. The variable installation method centrifugal pump disclosed in patent document (CN218598379U) achieves a change in installation method through dual water inlets and removable feet, which is convenient for factory production and user use. However, it also cannot achieve bidirectional flow and can only switch the water inlet direction during installation. It cannot change the flow direction during operation and does not have a reversing function.

[0008] Therefore, the current measures to realize forward and reverse flow have certain limitations, and a centrifugal pump structure capable of overcoming the above defects is urgently needed. SUMMARY

[0009] The present application aims to provide a pump body structure that can realize forward and reverse flow of a centrifugal pump, so as to reduce system equipment, improve reliability, reduce capital investment and floor area, while ensuring that the centrifugal pump has a high lift and meets the hydraulic performance required by the system.

[0010] To achieve the above-mentioned purpose, the present application adopts the following technical solution: a pump body structure capable of realizing bidirectional flow of a centrifugal pump, comprising a pump body main body and a reversing valve core, the pump body main body is connected to the system pipeline through two flanges, from the flange to the direction of the impeller rotation center line, the flow passage is gradually divided into two, respectively connected to the inlet and outlet flow passages of the impeller, and a reversing valve core is arranged at the position where the flow passage is divided into two; the reversing valve core extends out of the shaft head at both ends, and the shaft head can rotate the reversing valve core.

[0011] Further, the reversing valve core is provided with a gland at both ends for disassembly and maintenance of the reversing valve core.

[0012] Further, an O-ring is arranged between the reversing valve core and the gland for preventing leakage at the shaft head; the gland is connected to the pump body main body through a fastener.

[0013] Further, the flow passage of the pump body main body smoothly transitions from the flange to the direction of the impeller rotation center line, and the cross-sectional area of the flow passage gradually changes without obvious mutation.

[0014] Further, the flow passage of the reversing valve core smoothly transitions with the flow passage of the pump body main body, reducing the flow resistance of the fluid.

[0015] Further, the reversing valve core is made of wear-resistant and corrosion-resistant material, and the wear-resistant and corrosion-resistant material is consistent with the pump body main body.

[0016] Further, the fastener is a bolt and a nut, and the surface of the bolt is treated with anti-rust or made of corrosion-resistant material.

[0017] Further, the O-ring is made of oil-resistant rubber material and should be able to adapt to the temperature and chemical properties of different fluid media.

[0018] Further, the two flanges of the pump body main body are arranged symmetrically at 180°, facilitating pipeline installation.

[0019] Further, the two flanges of the pump body main body are arranged asymmetrically and adjusted according to the actual pipeline layout.

[0020] Compared with the prior art, the present application has the following beneficial effects:

[0021] 1. Reduce the equipment in the bidirectional water flow system, improve system reliability, reduce capital investment and floor space; there is no need to set up two independent pump groups or multiple valves. The pump body structure of the present invention can achieve bidirectional flow, simplifying the system structure.

[0022] 2. Compared with the water system that realizes forward and reverse flow by the forward and reverse rotation of the axial flow pump, the centrifugal pump has a higher head. The use of the present invention can enable the two-way water flow system to obtain a higher head, and can realize the switching of water flow direction without stopping the pump, thereby improving the operating efficiency and flexibility of the system.

[0023] 3. The inlet and outlet flanges of the present invention can be arranged 180° symmetrically or asymmetrically, which facilitates pipeline installation and adapts to different on-site layout requirements.

[0024] 4. When using the centrifugal pump of the present invention, as long as the impeller speed remains unchanged, the hydraulic performance of the centrifugal pump is consistent in forward and reverse flows, thereby ensuring the stability of system operation. BRIEF DESCRIPTION OF THE DRAWINGS

[0025] Figure 1 This is a schematic diagram of the existing setup with two independent pump groups and two one-way valves;

[0026] Figure 2 This is a schematic diagram of the existing setup with one pump and four valves;

[0027] Figure 3 This is a schematic diagram of the overall pump structure of the centrifugal pump that enables bidirectional flow;

[0028] Figure 4 yes Figure 3 Schematic diagram of the middle AA section;

[0029] Figure 5 Schematic diagram of the working state of the reversing valve core.

[0030] In the figure: 1- pump body, 2- reversing valve core 1, 3- reversing valve core 2, 4- gland, 5- fastener, 6- O-ring. DETAILED DESCRIPTION

[0031] The present invention will be further described in detail below with reference to the accompanying drawings and specific embodiments.

[0032] like Figures 3 to 5As shown, the pump body structure of the application can make the centrifugal pump realize bidirectional flow, comprising pump body main body 1, reversing valve core one 2, reversing valve core two 3, gland 4, fastener 5, O-ring 6. Wherein the pump body main body 1 can be connected with the system pipeline through two flanges, from the flange to the direction of the impeller rotation center line, the flow passage is gradually divided into two, and is connected with the impeller inlet and outlet flow passages respectively, and the reversing valve core one 2 and the reversing valve core two 3 are arranged at the positions where the flow passage is divided into two. The reversing valve core one 2 and the reversing valve core two 3 extend shaft heads at two ends, which are used for rotating the reversing valve core one 2 and the reversing valve core two 3. The reversing valve core one 2 and the reversing valve core two 3 are provided with the gland 4 at two ends, which are used for disassembling and maintaining the reversing valve core one 2 and the reversing valve core two 3. The O-ring is arranged between the reversing valve core one 2, the reversing valve core two 3 and the gland, which is used for preventing leakage at the shaft head. The gland 4 is connected with the pump body main body 1 through the fastener 5.

[0033] The specific implementation process of the application is as follows:

[0034] 1. The annular pressurized water type and the annular suction type are designed according to the traditional method.

[0035] 2. From the two flange interfaces to the direction of the impeller rotation center line, the flow passage is gradually divided into two, and is connected with the impeller inlet and outlet flow passages respectively, and the flow passage should be smoothly transitioned.

[0036] 3. The reversing valve core is arranged at the positions where the two flow passages are divided into two, and the reversing valve core flow passage is smoothly transitioned with the original flow passage.

[0037] 4. According to the pump body and valve core structure, the gland is designed, and the appropriate fastener and O-ring are selected.

[0038] In the design process, the direction of water flow in the pump body, the flow area should be considered comprehensively, and the phenomenon that the flow direction or the flow area changes sharply should not appear.

Claims

1. A pump body structure that enables a centrifugal pump to achieve bidirectional flow, characterized in that: It includes a pump body and a reversing valve core. The pump body is connected to the system pipeline through two flanges. From the flange to the centerline of the impeller rotation, the flow channel gradually splits into two, connecting the impeller inlet and outlet flow channels respectively. A reversing valve core is set at each position where the flow channel is divided into two; shaft heads extend from both ends of the reversing valve core, and the reversing valve core can be rotated by the shaft heads.

2. The pump body structure capable of achieving bidirectional flow in a centrifugal pump according to claim 1, characterized in that: Both ends of the reversing valve core are provided with glands for disassembly, assembly and maintenance of the reversing valve core.

3. The pump body structure capable of achieving bidirectional flow in a centrifugal pump according to claim 1, characterized in that: An O-ring is installed between the reversing valve core and the gland to prevent leakage at the shaft head; the gland is connected to the pump body through fasteners.

4. The pump body structure capable of achieving bidirectional flow in a centrifugal pump according to claim 1, characterized in that: The flow channel of the pump body transitions smoothly from the flange to the impeller rotation centerline, and the cross-sectional area of ​​the flow channel changes gradually without obvious mutation.

5. The pump body structure capable of achieving bidirectional flow in a centrifugal pump according to claim 1, characterized in that: The flow channel of the reversing valve core and the flow channel of the pump body are smoothly transitioned, thereby reducing fluid flow resistance.

6. The pump body structure capable of achieving bidirectional flow in a centrifugal pump according to claim 1, characterized in that: The reversing valve core is made of wear-resistant and corrosion-resistant material, and the wear-resistant and corrosion-resistant material is consistent with the pump body.

7. The pump body structure capable of achieving bidirectional flow in a centrifugal pump according to claim 1, characterized in that: The fasteners are bolts and nuts, and the surfaces of the bolts are subjected to rust-proof treatment or are made of corrosion-resistant materials.

8. The pump body structure capable of achieving bidirectional flow in a centrifugal pump according to claim 1, characterized in that: The O-ring is made of oil-resistant rubber material and should be able to adapt to the temperature and chemical characteristics of different fluid media.

9. The pump body structure capable of achieving bidirectional flow in a centrifugal pump according to claim 1, characterized in that: The two flanges of the pump body are arranged symmetrically at 180 degrees, which is convenient for pipeline installation.

10. The pump body structure capable of achieving bidirectional flow in a centrifugal pump according to claim 1, characterized in that: The two flanges of the pump body are arranged asymmetrically and are adjusted according to the actual pipeline layout.

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