Vertical shaft submersible pump directly driven by permanent magnet motor

Abstract

The utility model provides a permanent magnet motor direct drive type shaft vertical submersible pump which comprises a water guide and suction horn mouth, a vertical submersible pump section and a water outlet shaft which are sequentially connected in the water flow direction, a vertical permanent magnet motor is arranged in the water outlet shaft, and the vertical submersible pump section is in direct connection transmission by being connected with the permanent magnet motor. The hydraulic model of the pump section of the vertical submersible pump is a conventional hydraulic model. A submersible asynchronous motor and a transmission gear box of a traditional conventional vertical submersible pump are replaced by the permanent magnet motor with the small size, and a hydraulic model of a pump section of the vertical submersible pump is a conventional hydraulic model, so that a novel vertical submersible pump group structure is formed; the structure can directly utilize an excellent conventional pump section hydraulic model which is already inspected and identified, meanwhile, the permanent magnet motor is adopted, the outer diameter of the motor is small, water flow at the tail of the motor is stable, hydraulic loss is small, the permanent magnet motor has the advantages of being low in rotating speed, a transmission gear box can be omitted, the pump device is directly connected with a water pump for transmission, and the internal flow state of the pump device is improved.

Description

Technical Field

[0001] The utility model belongs to the technical field of water conservancy engineering, and more specifically relates to a permanent magnet motor directly driven vertical wellbore submersible pump. Background Art

[0002] The vertical submersible pump is an integrated pump unit, which has the characteristics of compact pump unit structure, simple civil engineering structure, convenient installation and low operating noise. With the in-depth research of submersible motors and the gradual improvement of manufacturing level, the power, flow rate and head of submersible pumps in water conservancy projects tend to develop towards large and medium-sized.

[0003] However, the compact structure of vertical submersible pumps also limits the manufacture and use of high-power, large-scale vertical submersible pumps. Due to the limitation of cavitation performance (nD value), when the submersible pump is enlarged, the pump speed is reduced, which makes the size of the direct-connected motor larger. Even if equipped with a planetary gear reducer, the size of the conventional motor is still large, which will affect the internal flow state of the pump device, reduce the operating efficiency of the unit, and even increase vibration, bringing destructive effects. At the same time, due to the limitation of the heat dissipation requirements of the conventional submersible motor rotor, it is still difficult to achieve large-scale submersible pumps.

[0004] In addition, the structural characteristics of large and medium-sized vertical submersible pumps are significantly different from those of conventional vertical pumps. Figure 4 The size of the motor or the submersible pump with a planetary gearbox with a reduction drive (such as Figure 5 The dimensions of the impellers are larger than those of submersible pumps equipped with conventional pump section hydraulic models. Therefore, large and medium-sized submersible pumps cannot directly apply the excellent hydraulic models of conventional pump sections. They all need to re-match the guide vanes under the selected target impeller and given control size constraints to match the guide vane structure with the submersible pump structure. Utility Model Content

[0005] The purpose of the utility model is to provide a permanent magnet motor direct-driven wellbore vertical submersible pump to solve the technical problems in flow state, operation efficiency, etc. that the pump sections of large and medium-sized submersible pumps cannot directly apply conventional excellent hydraulic models and that the vertical submersible pumps are developing towards large and medium-sized ones.

[0006] To achieve the above-mentioned purpose, the utility model provides a permanent magnet motor directly driven wellbore vertical submersible pump, comprising a water guide and suction bell mouth, a vertical submersible pump section and a water outlet wellbore connected in sequence along the water flow direction, a vertical permanent magnet motor is arranged in the water outlet wellbore, the vertical submersible pump section is directly connected to the permanent magnet motor for transmission, and the hydraulic model of the vertical submersible pump section is a conventional hydraulic model.

[0007] Furthermore, a connection base is provided at one end of the water outlet shaft close to the pump section of the vertical submersible pump, and the pump section of the vertical submersible pump is clamped on the inner wall of the connection base by its own weight.

[0008] Furthermore, the inner diameter of the connecting base gradually increases along the flow direction of the water.

[0009] Furthermore, a sealing rubber ring is provided between the pump section of the vertical submersible pump and the inner wall of the connecting base.

[0010] Furthermore, the connecting base includes a horizontal section and a conical section which are connected to each other.

[0011] Furthermore, the angle between the tapered section and the horizontal direction does not exceed 70°.

[0012] Furthermore, the angle between the conical section and the horizontal direction is 65°, and the sealing rubber ring is an O-type rubber ring.

[0013] Furthermore, at least two sealing rubber rings are provided.

[0014] Furthermore, a pressure rod device is connected to the upper part of the permanent magnet motor, and the pressure rod device is used to connect to the civil engineering foundation.

[0015] Furthermore, the pressure rod device is a hollow rod, the interior of which is used to lay the cables of the permanent magnet motor.

[0016] Furthermore, the permanent magnet motor is of a slender structure, and its outer dimensions are evenly transitioned to the inner circle dimensions of the pump section of the vertical submersible pump.

[0017] Compared with the prior art, the utility model has the following technical effects:

[0018] The utility model is a kind of permanent magnet motor direct drive wellbore vertical submersible pump. The small-volume permanent magnet motor is used to replace the submersible asynchronous motor and transmission gearbox of the traditional conventional vertical submersible pump, and the hydraulic model of the pump section of the vertical submersible pump is a conventional hydraulic model, thus forming a new vertical submersible pump group structure, which can directly use the excellent conventional pump section hydraulic model that has been tested and recognized, such as the South-to-North Water Diversion series. At the same time, the utility model adopts a permanent magnet motor, the motor has a small outer diameter, the water flow at the tail of the motor is stable, the hydraulic loss is small, and the low speed of the permanent magnet motor can save the transmission gearbox and directly connect the water pump drive, the mechanical noise is small, the internal flow state of the pump device is improved, and the operation efficiency of the unit is improved. The vertical submersible pump of the utility model solves the problems of flow state, operation efficiency, etc. in the development of vertical submersible pumps to large and medium-sized ones. The vertical submersible pump of the utility model has a compact structure and requires a small pump room size, especially in the project where the use area of ​​the pump station is limited or it is required not to set up a ground plant (to coordinate with the surrounding environment). BRIEF DESCRIPTION OF THE DRAWINGS

[0019] In order to more clearly illustrate the technical solutions in the embodiments of the present invention, the drawings required for use in the embodiments or the description of the prior art will be briefly introduced below. Obviously, the drawings described below are only some embodiments of the present invention. For ordinary technicians in this field, other drawings can be obtained based on these drawings without paying creative labor.

[0020] Figure 1 A schematic cross-sectional structure diagram of a permanent magnet motor direct-driven wellbore vertical submersible pump provided in an embodiment of the utility model;

[0021] Figure 2 for Figure 1 Schematic diagram of the local enlarged structure in;

[0022] Figure 3 for Figure 1 Schematic diagram of the internal flow pattern;

[0023] Figure 4 It is a schematic cross-sectional structure diagram of a conventional vertical submersible pump (direct connection) in the prior art;

[0024] Figure 5 It is a schematic diagram of the cross-sectional structure of a conventional vertical submersible pump (gear box reduction) in the prior art.

[0025] Among them, the reference numerals in the figure are:

[0026] 1. Permanent magnet motor, 2. Vertical submersible pump section, 3. Water guide and suction bell mouth, 4. Water outlet shaft, 5. Sealing rubber ring, 6. Connecting base, 7. Pressure rod device. DETAILED DESCRIPTION

[0027] In order to make the technical problems, technical solutions and beneficial effects to be solved by the present invention more clearly understood, the present invention is further described in detail below in conjunction with the accompanying drawings and embodiments. It should be understood that the specific embodiments described herein are only used to explain the present invention and are not used to limit the present invention.

[0028] It should be understood that the terms "length", "up", "down", "vertical", "horizontal", "top", "bottom", "inside", "outside", etc., indicating the orientation or position relationship, are based on the orientation or position relationship shown in the drawings, and are only for the convenience of describing the present invention and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and therefore cannot be understood as a limitation on the present invention.

[0029] The terms used in the embodiments of the present invention are only for the purpose of describing specific embodiments, and are not intended to limit the present invention. The singular forms "a", "said" and "the" used in the embodiments of the present invention and the appended claims are also intended to include plural forms, unless the context clearly indicates other meanings.

[0030] See also Figure 1-Figure 3 Now, a permanent magnet motor direct-driven wellbore vertical submersible pump provided in an embodiment of the utility model is described.

[0031] In one embodiment of the utility model, a permanent magnet motor direct-driven wellbore vertical submersible pump of the utility model embodiment includes a water guide and suction bell mouth 3, a vertical submersible pump section 2 and a water outlet wellbore 4 connected in sequence along the water flow direction, a vertical permanent magnet motor 1 is provided in the water outlet wellbore 4, the vertical submersible pump section 2 is directly connected to the permanent magnet motor 1 for transmission, and the hydraulic model of the vertical submersible pump section 2 is a conventional hydraulic model.

[0032] A permanent magnet motor direct-driven wellbore vertical submersible pump in an embodiment of the utility model utilizes a small-volume permanent magnet motor 1 to replace the submersible asynchronous motor and transmission gearbox of a conventional vertical submersible pump, and the hydraulic model of the pump section 2 of the vertical submersible pump is a conventional hydraulic model, thus forming a new vertical submersible pump group structure, which can directly utilize conventional excellent pump section hydraulic models that have been tested and recognized, such as the South-to-North Water Diversion series. At the same time, the utility model adopts a permanent magnet motor 1 with a small outer diameter, stable water flow at the tail of the motor, and small hydraulic loss. The low speed of the permanent magnet motor 1 can save the transmission gearbox and directly connect to the water pump drive, with low mechanical noise, improved internal flow state of the pump device, and improved operating efficiency of the unit.

[0033] The vertical submersible pump of the embodiment of the utility model is a permanent magnet motor direct-driven vertical submersible pump for wellbore, which solves the problems of flow state, operation efficiency, etc. in the development of vertical submersible pumps to large and medium-sized ones. The vertical submersible pump of the embodiment of the utility model has a compact structure and requires a small pump room, which is more suitable for projects where the use area of ​​the pump station is limited or where it is required not to set up a ground plant (to coordinate with the surrounding environment).

[0034] In this embodiment, a connection base 6 is provided at one end of the water outlet shaft 4 close to the vertical submersible pump section 2, and the vertical submersible pump section 2 is clamped on the inner wall of the connection base 6 by its own weight. The water outlet shaft 4 can be formed by pouring concrete, and at this time, the connection base 6 is pre-buried in the water outlet shaft 4.

[0035] Furthermore, the inner diameter of the connecting base 6 of this embodiment gradually increases along the direction of water flow, thus forming a gradually decreasing inner diameter structure from top to bottom, which is beneficial to the tightness of the connection between the vertical submersible pump section 2 and the connecting base 6 under the action of gravity.

[0036] Furthermore, a sealing rubber ring 5 is provided between the pump section 2 of the vertical submersible pump of the present embodiment and the inner wall of the connection base 6. The sealing rubber ring 5 is tightly attached to the inner wall of the water outlet wellbore 4 under the deadweight of the pump section 2 of the vertical submersible pump, and the nonlinear mechanical transmission mechanism characteristics of the superelastic material of the rubber ring are used to ensure sealing and anti-rotation, so as to improve the sealing performance of the connection between the pump section 2 of the vertical submersible pump and the connection base 6. The sealing rubber ring 5 can be an O-type rubber ring. At least two sealing rubber rings 5 ​​are provided to further improve the sealing performance of the connection between the pump section 2 of the vertical submersible pump and the connection base 6.

[0037] In this embodiment, the connection base 6 includes a horizontal section and a conical section connected to each other, and the conical section is used to connect with one end of the vertical submersible pump section 2. Further, the angle between the conical section and the horizontal direction does not exceed 70°, and in this embodiment, the angle between the conical section and the horizontal direction is 65° to ensure that the compression rate of the sealing rubber ring 5 does not change suddenly.

[0038] In this embodiment, the water-suction bell mouth 3, the vertical submersible pump section 2 and the permanent magnet motor 1 can be pre-assembled into an integral structure, the water outlet shaft 4 is a concrete structure, and a connecting base 6 is pre-buried in the water outlet shaft 4. The integral structure composed of the water-suction bell mouth 3, the vertical submersible pump section 2 and the permanent magnet motor 1 is wedge-coupled with the water outlet shaft 4 through the connecting base 6.

[0039] The upper part of the permanent magnet motor 1 of this embodiment is also connected to a pressure rod device 7, which is used to connect to the civil engineering foundation. Further, the pressure rod device 7 of this embodiment is a hollow rod, and the interior of the pressure rod device 7 is used to lay the cable of the permanent magnet motor 1. The permanent magnet motor 1 of this embodiment is a slender structure (i.e., a rectangle with a length greater than a width), and its outer dimensions are evenly transitioned and connected with the inner circle dimensions of the vertical submersible pump section 2, ensuring that the water flow does not diffuse at a large angle after passing through the guide vane and the motor, and the flow state is smooth, and the slender structure type permanent magnet motor 1 is smaller in size, which can further reduce the volume of the pump device structure.

[0040] The flow rate of existing vertical submersible pumps is generally small and is not suitable for water conservancy projects, especially drainage projects. The flow rate of the permanent magnet motor direct-driven wellbore vertical submersible pump in the embodiment of the utility model is in the range of 5 to 15 m 3 / s (i.e. 18000~54000m 3 / h), the power range is 250kW~1250kW, and can even reach a larger power, which is more suitable for application in water conservancy projects, especially drainage projects.

[0041] All unexplained parts involved in the embodiments of the present invention belong to the prior art.

[0042] The above embodiments only express several implementation methods of the utility model, and the descriptions are relatively specific and detailed, but they cannot be understood as limiting the scope of the utility model patent. It should be pointed out that for ordinary technicians in this field, several modifications and improvements can be made without departing from the concept of the utility model, which all belong to the protection scope of the utility model. Therefore, the protection scope of the utility model patent shall be based on the attached claims.

Claims

1. A permanent magnet motor direct-driven vertical submersible pump, characterized in that: It comprises a water guiding and suction bell mouth, a vertical submersible pump section and a water outlet wellbore which are sequentially connected along the water flow direction. A vertical permanent magnet motor is arranged in the water outlet wellbore. The vertical submersible pump section is directly connected to the permanent magnet motor for transmission. The hydraulic model of the vertical submersible pump section is a conventional hydraulic model.

2. A permanent magnet motor direct-driven vertical submersible pump for wellbore as claimed in claim 1, characterized in that: A connection base is provided at one end of the water outlet wellbore close to the pump section of the vertical submersible pump, and the pump section of the vertical submersible pump is clamped on the inner wall of the connection base by its own weight.

3. A permanent magnet motor direct-driven vertical submersible pump for wellbore as claimed in claim 2, characterized in that: The inner diameter of the connecting base gradually increases along the flow direction of the water.

4. A permanent magnet motor direct-driven vertical submersible pump for wellbore as claimed in claim 3, characterized in that: A sealing rubber ring is provided between the pump section of the vertical submersible pump and the inner wall of the connecting base.

5. A permanent magnet motor direct-driven vertical submersible pump for wellbore as claimed in claim 4, characterized in that: The connecting base comprises a horizontal section and a tapered section which are connected to each other.

6. A permanent magnet motor direct-driven vertical submersible pump for wellbore as claimed in claim 5, characterized in that: The angle between the tapered section and the horizontal direction does not exceed 70°.

7. A permanent magnet motor direct-driven vertical submersible pump for a wellbore as claimed in claim 6, characterized in that: The angle between the conical section and the horizontal direction is 65°, and the sealing rubber ring is an O-type rubber ring.

8. A permanent magnet motor direct-driven vertical submersible pump for wellbore as claimed in claim 7, characterized in that: There are at least two sealing rubber rings.

9. A permanent magnet motor direct-driven vertical wellbore submersible pump as claimed in any one of claims 1 to 8, characterized in that: The upper part of the permanent magnet motor is also connected with a pressure rod device, and the pressure rod device is used to connect to the civil engineering foundation.

10. A permanent magnet motor direct-driven vertical submersible pump for wellbore as claimed in claim 9, characterized in that: The pressure rod device is a hollow rod, the interior of which is used to lay the cables of the permanent magnet motor.

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