Full-adjustment submersible tubular pump for overflowing blades of vertical shaft

Abstract

The utility model discloses a diving tubular pump with fully-adjustable shaft overflowing blades, and relates to the technical field of water conservancy projects. The device comprises a diving tubular pump, the left end of the diving tubular pump is connected with a round-square gradually-changing flow channel through a left-end expansion joint, and the right end of the diving tubular pump is connected with a vertical shaft flow channel through a right-end expansion joint; a vertical shaft is arranged in the vertical shaft flow channel; an asynchronous submersible motor, a planetary gearbox, a thrust bearing box, a pump section hydraulic model and a hollow adjusting shaft are sequentially arranged in the submersible tubular pump from left to right, and the right end of the hollow adjusting shaft extends into the vertical shaft to be connected with a built-in synchronous hydraulic adjusting mechanism. Diffusion type guide vanes are not arranged any more, excellent conventional pump section hydraulic models, such as south-to-north water diversion series and the like, which are already checked and affirmed can be directly utilized, and meanwhile dynamic operation full adjustment of the vanes of the submersible tubular pump is achieved.

Description

Technical Field

[0001] This utility model relates to the field of water conservancy engineering technology, and more specifically, it is a submersible axial flow pump with fully adjustable blades for vertical shafts. Background Technology

[0002] Horizontal submersible axial flow pumps are integrated pump sets used in hydraulic engineering. Currently, the blades of submersible axial flow pumps cannot be dynamically adjusted, meaning the blades are either not adjusted or partially adjusted after shutdown. As the power, flow rate, and head of submersible pumps tend to be larger, the scale of individual submersible axial flow pumps is also increasing. With larger pumps, the requirements for stability and flow rate matching under different operating conditions are higher. Dynamic blade adjustment technology is an important control method to improve operating conditions. On the other hand, some riverside key pumping stations have small heads and large flow rates, and most operate in both directions. In recent years, domestic scholars have studied the hydraulic performance of "S"-shaped blades and their compatibility with bidirectional horizontal submersible axial flow pumps. While pumps meet basic engineering requirements, the actual operating head varies significantly under different bidirectional operating conditions. Dynamic blade adjustment technology is an important control method that balances bidirectional hydraulic performance. Due to the limitations of the motor structure at the drive end, the blades of currently used horizontal submersible axial flow pumps are generally fixed, making it impossible to adjust the blade angle according to usage needs. Consequently, it is not convenient to adjust the flow rate by different blade angles, resulting in poor performance in the large-scale and bidirectional operation of submersible axial flow pumps. Furthermore, domestic scholars have conducted extensive research on the selection of hydraulic models for conventional large and medium-sized pumps, but these studies on hydraulic model selection and equipment are all based on existing mature pump section hydraulic models.

[0003] Currently, submersible axial flow pumps all adopt a unique diffuser-type guide vane structure, and there has been no attempt to directly apply the excellent hydraulic models of existing large and medium-sized water pumps to submersible axial flow pumps.

[0004] Therefore, in order to solve the problems in the development of horizontal submersible axial flow pumps towards large and medium-sized models, as well as the flow state, structure and performance issues in bidirectional applications, it is necessary to develop a submersible axial flow pump with fully adjustable blades in vertical shafts that can directly utilize the excellent conventional pump section hydraulic model that has been verified and recognized, and realize the dynamic operation of the submersible axial flow pump with fully adjustable blades. Utility Model Content

[0005] Currently, there is limited research on large submersible axial flow pumps with high power and high flow rate; bidirectional pumps are rare, and fully adjustable pumps are almost nonexistent. With social progress and economic development, various sectors of the national economy have placed urgent demands on the power, flow rate, head, and bidirectional operation of submersible axial flow pumps. Due to limitations in cavitation performance (nD value), the pump speed decreases when submersible pumps are enlarged, resulting in a larger direct-drive motor. Even with a planetary gear reducer, the conventional motor remains bulky, which can affect the internal flow pattern of the pump unit, reduce operating efficiency, and even increase vibration, leading to destructive effects. Horizontal submersible axial flow pumps are further constrained by the motor structure at the drive end, making it difficult to install a blade adjustment mechanism.

[0006] The purpose of this utility model is to overcome the shortcomings of the above-mentioned background technology and to provide a submersible axial flow pump with fully adjustable flow vanes in a vertical shaft.

[0007] To achieve the above objectives, the technical solution of this utility model is as follows: a submersible axial flow pump with fully adjustable blades for vertical shaft flow, comprising a submersible axial flow pump, characterized in that: the left end of the submersible axial flow pump is connected to a round-square gradient flow channel via a left end expansion joint, and the right end is connected to a vertical shaft flow channel via a right end expansion joint; a vertical shaft is provided inside the vertical shaft flow channel;

[0008] The submersible axial flow pump is equipped with an asynchronous submersible motor, a planetary gearbox, a thrust bearing box, a pump section hydraulic model, and a hollow adjusting shaft, arranged sequentially from left to right. The right end of the hollow adjusting shaft extends into the vertical shaft and is connected to the built-in synchronous hydraulic adjusting mechanism. The hollow adjusting shaft and the asynchronous submersible motor drive shaft are arranged at opposite ends.

[0009] In the above technical solution, a main shaft seal is provided at the connection between the hollow adjusting shaft and the vertical shaft, and a water guide bearing box is provided between the main shaft seal and the built-in synchronous hydraulic adjusting mechanism of the hollow adjusting shaft.

[0010] In the above technical solution, the structure of the pump section hydraulic model no longer sets diffuser-type guide vanes in the diffuser section between the asynchronous submersible motor and the fully adjustable impeller. The pump section hydraulic model adopts an excellent conventional pump section hydraulic model that has been tested and recognized. The pump section hydraulic model includes a fully adjustable impeller and guide vanes. The fully adjustable impeller is arranged on the side closer to the asynchronous submersible motor, and the guide vanes are arranged on the side closer to the vertical shaft flow channel.

[0011] In the above technical solution, the built-in synchronous hydraulic adjustment mechanism is arranged horizontally. The built-in synchronous hydraulic adjustment mechanism includes a hydraulic adjustment machine and an adjustment rod. The hydraulic adjustment machine and the adjustment rod rotate synchronously with the full adjustment impeller.

[0012] Compared with the prior art, this utility model has the following advantages:

[0013] 1) This utility model utilizes a vertical shaft in the vertical flow channel to separate the drive shaft of the asynchronous submersible motor and the hollow adjustment shaft of the blades into two separate arrangements, forming a new horizontal submersible axial flow pump unit structure. This structure no longer sets diffuser-type guide vanes in the diffuser section between the motor and the impeller, and can directly utilize the hydraulic model of excellent conventional pump sections that have been tested and recognized, such as the South-to-North Water Diversion series. At the same time, it realizes the dynamic operation and full adjustment of the blades of the submersible axial flow pump. Attached Figure Description

[0014] Figure 1 This is a cross-sectional view of the present invention.

[0015] Figure 2 This is a plan view of the present invention.

[0016] Among them, 100-submersible axial flow pump, 110-asynchronous submersible motor, 120-planetary gearbox, 130-thrust bearing housing, 140-pump section hydraulic model, 141-fully adjustable impeller, 142-guide vane, 150-hollow adjusting shaft, 151-main shaft seal, 152-water guide bearing housing, 160-built-in synchronous hydraulic adjusting mechanism, 161-hydraulic adjusting machine, 162-adjusting tie rod, 210-left end expansion joint, 220-right end expansion joint, 310-round-square gradient flow channel, 320-vertical shaft flow channel, 321-vertical shaft. Detailed Implementation

[0017] The following detailed description, in conjunction with the accompanying drawings, illustrates the implementation of this utility model. However, these descriptions do not constitute a limitation of the present utility model and are merely illustrative. Furthermore, the advantages of this utility model will become clearer and easier to understand through this description.

[0018] Referring to the attached drawings: The submersible axial flow pump with fully adjustable blades in the vertical shaft includes a submersible axial flow pump 100, characterized in that: the left end of the submersible axial flow pump 100 is connected to the circular-square transition channel 310 via a left end expansion joint 210, and the right end is connected to the vertical shaft channel 320 via a right end expansion joint 220; a vertical shaft 321 is provided inside the vertical shaft channel 320; a working gate 410 and an emergency gate 420 are sequentially arranged on the left side of the circular-square transition channel 310, and a working gate 410 and a maintenance gate 430 are provided inside the vertical shaft channel 320;

[0019] The submersible axial flow pump 100 is equipped with, from left to right, an asynchronous submersible motor 110, a planetary gearbox 120, a thrust bearing box 130, a pump section hydraulic model 140, and a hollow adjusting shaft 150. The right end of the hollow adjusting shaft 150 extends into the vertical shaft 321 and is connected to the built-in synchronous hydraulic adjusting mechanism 160. The hollow adjusting shaft 150 and the drive shaft of the asynchronous submersible motor 110 are arranged at opposite ends.

[0020] A main shaft seal 151 is provided at the connection between the hollow adjusting shaft 150 and the vertical shaft 321. A water guide bearing housing 152 is provided between the hollow adjusting shaft 150 and the built-in synchronous hydraulic adjusting mechanism 160. The built-in synchronous hydraulic adjusting mechanism 160, the water guide bearing housing 152, and the main shaft seal 151 are arranged in the vertical shaft 321. The length of the vertical shaft 321 takes into account the length required for the hollow adjusting shaft 150 to be pulled out.

[0021] This invention eliminates the need for diffuser-type guide vanes in the diffuser section between the asynchronous submersible motor 110 and the fully adjustable impeller 141. It can directly utilize excellent conventional pump section hydraulic models that have been tested and verified, such as those used in the South-to-North Water Diversion Project, to optimize the internal flow pattern. The pump section hydraulic model 140 includes a fully adjustable impeller 141, guide vanes 142, and an impeller chamber. The fully adjustable impeller 141 is arranged on the side closer to the asynchronous submersible motor 110, and the guide vanes 142 are arranged on the side closer to the vertical shaft flow channel 320.

[0022] The built-in synchronous hydraulic adjustment mechanism 160 is arranged horizontally. The built-in synchronous hydraulic adjustment mechanism 160 includes a hydraulic adjustment machine 161 and an adjustment rod 162. The hydraulic adjustment machine 161 and the adjustment rod 162 rotate synchronously with the full adjustment impeller 141.

[0023] All other unspecified parts belong to the prior art.

Claims

1. A submersible axial flow pump with fully adjustable blades for vertical shafts, comprising a submersible axial flow pump (100), characterized in that: The left end of the submersible axial flow pump (100) is connected to the circular-square gradient flow channel (310) via a left end expansion joint (210), and the right end is connected to the vertical shaft flow channel (320) via a right end expansion joint (220); a vertical shaft (321) is provided inside the vertical shaft flow channel (320); The submersible axial flow pump (100) is provided with an asynchronous submersible motor (110), a planetary gearbox (120), a thrust bearing box (130), a pump section hydraulic model (140), and a hollow adjusting shaft (150) arranged from left to right. The right end of the hollow adjusting shaft (150) extends into the vertical shaft (321) and is connected to the built-in synchronous hydraulic adjusting mechanism (160). The hollow adjusting shaft (150) and the drive shaft of the asynchronous submersible motor (110) are arranged at opposite ends.

2. The fully adjustable submersible axial flow pump with vertical shaft flow vanes according to claim 1, characterized in that: A main shaft seal (151) is provided at the connection between the hollow adjusting shaft (150) and the vertical shaft (321), and a water guide bearing box (152) is provided between the main shaft seal (151) and the built-in synchronous hydraulic adjusting mechanism (160) of the hollow adjusting shaft (150).

3. The fully adjustable submersible axial flow pump with vertical shaft flow vanes according to claim 2, characterized in that: The pump section hydraulic model (140) includes a fully adjustable impeller (141) and a guide vane (142). The fully adjustable impeller (141) is arranged on the side close to the asynchronous submersible motor (110), and the guide vane (142) is arranged on the side close to the vertical shaft flow channel (320).

4. The fully adjustable submersible axial flow pump with vertical shaft flow vanes according to claim 3, characterized in that: The built-in synchronous hydraulic adjustment mechanism (160) is arranged horizontally. The built-in synchronous hydraulic adjustment mechanism (160) includes a hydraulic adjustment machine (161) and an adjustment rod (162). The hydraulic adjustment machine (161) and the adjustment rod (162) rotate synchronously with the full adjustment impeller (141).

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