Compact submersible electric pump

Abstract

The utility model provides a compact submersible electric pump, which relates to the technical field of pumps and comprises a motor component, a pump component, a sealing device and a connecting shell. The motor assembly comprises a motor shell, a motor internal structure and a driving shaft; the pump assembly comprises an impeller and a pump shell. The sealing device comprises a sealing seat and a sealing part; the connecting shell is located between the motor shell and the pump shell to form a connecting structure. And the connecting shell covers the periphery of the sealing seat. The motor shell, the sealing seat and the connecting shell jointly form an annular water inlet flow channel in the direction of entering the pump shell around the periphery of the driving shaft in the axial direction of the driving shaft, and a flow guide surface is arranged on the inner side of the water inlet flow channel. In addition, the flow guide surface gradually gets close to the driving shaft and is folded to form a streamline in the direction of entering the pump shell in the axial direction of the driving shaft. The streamline flow guide surface is arranged in the water inlet runner, the water inlet flow state can be effectively improved, and then the cavitation performance is improved.

Description

TECHNICAL FIELD

[0001] The present application relates to the technical field of pump, in particular to a compact submersible electric pump. BACKGROUND

[0002] As a kind of water supply and drainage tool, submersible electric pump is used in daily life in large quantities.In recent years, especially portable high-flow submersible electric pump plays an important role in flood prevention and drought resistance due to its small weight and large displacement.In the process of flood prevention and drought resistance, the site condition is complex and poor.On the one hand, different water power performance is required according to the site condition, on the other hand, due to the emergency of the site condition, equipment maintenance and replacement need to be carried out quickly.The internal structure of the traditional submersible electric pump is integrated to reduce weight and size, and the relationship between various parts is complex.In order to achieve lightness and small size, the difficulty of equipment maintenance and part replacement is greatly increased.At the same time, the performance of single pump is limited by the adjustable range of water power components, and the adaptability to complex and changeable site conditions is limited.

[0003] Due to the poor water inlet condition in emergency rescue, the submersion depth of submersible electric pump is small, in order to ensure the stable and efficient operation of the unit, the cavitation performance of electric pump is very important for equipment operation. CONTENT OF THE INVENTION

[0004] The technical problem to be solved by the present application is to provide a compact submersible electric pump to solve the above problems in the prior art.

[0005] A compact submersible electric pump, the compact submersible electric pump comprises:

[0006] A motor assembly comprising a motor housing, a motor internal structure contained in the motor housing, and a drive shaft extending out of the motor housing;

[0007] A pump assembly comprising an impeller and a pump housing; the pump housing has a water inlet side and a water outlet side, wherein the water inlet side faces the motor assembly, and the drive shaft penetrates into the pump housing from the water inlet side; the impeller is contained in the pump housing and assembled on the drive shaft;

[0008] A sealing device arranged on the outer periphery of the drive shaft and located on the side of the motor housing close to the pump housing; the sealing device comprises a sealing seat and a sealing part arranged in the sealing seat;

[0009] A connecting housing located between the motor housing and the pump housing to form a connecting structure; the connecting housing is wrapped around the outer periphery of the sealing seat;

[0010] The motor housing, the sealing seat and the connecting housing jointly form a ring-shaped water inlet channel in the direction of the driving shaft into the pump housing, and have a flow guide surface on the inner side of the water inlet channel; and the flow guide surface gradually converges towards the driving shaft in the direction of the driving shaft into the pump housing and forms a streamlined shape.

[0011] Optionally, the connecting housing comprises a flow guide body, a connecting body and a support; the flow guide body is located on the side close to the motor housing; the support is located on the side close to the pump housing and is connected with the pump housing; and the connecting body connects the flow guide body and the support.

[0012] The flow guide body is wrapped around the outer periphery of the sealing seat, and the outer side surface thereof is a second section of the flow guide surface; the sealing seat partially extends out of the flow guide body in the direction of the driving shaft into the pump housing, and a third section of the flow guide surface is formed in front of the second section of the flow guide surface; and a first section of the flow guide surface is formed on the outer side wall of the motor housing close to the flow guide body.

[0013] The first section of the flow guide surface, the second section of the flow guide surface and the third section of the flow guide surface are sequentially connected to jointly form the flow guide surface.

[0014] Optionally, a plurality of plate-shaped connecting bodies are arranged along the ring direction of the water inlet channel to divide the water inlet channel into a plurality of sub-water inlet channels.

[0015] Optionally, a plurality of front flow guide plates are arranged on the first section of the flow guide surface of the motor housing, and the front flow guide plates are connected to the connecting bodies one by one.

[0016] Optionally, the inner side structure of the flow guide body and the sealing seat are connected by a plurality of first bolts, and the sealing seat and the motor housing are connected by a plurality of second bolts; the first bolts and the second bolts are arranged within the space range defined by the flow guide surface.

[0017] Optionally, the flow guide body is provided with an opening penetrating to the inner side on the second section of the flow guide surface, and the opening corresponds to the mounting position of the first bolt one by one.

[0018] Optionally, the sealing seat is detachably connected to the end of the motor housing; the connecting housing is detachably connected to the motor housing and the sealing seat respectively; and the impeller is detachably mounted on the driving shaft.

[0019] Optionally, the compact submersible electric pump is provided with a plurality of pump assemblies of different types, and the plurality of pump assemblies of different types can be installed in place of each other.

[0020] Optionally, the pump assembly is a structure of axial flow pump or centrifugal pump.

[0021] Optionally, the sealing device is a double-end mechanical sealing device.

[0022] The application provides a compact submersible electric pump. A connecting shell is arranged between a motor shell and a pump shell to form a connecting structure. The connecting shell is wrapped around the outer periphery of a sealing seat. The motor shell, the sealing seat and the connecting shell jointly form a ring-shaped water inlet flow channel around the outer periphery of a driving shaft and in the direction of the driving shaft into the pump shell, and have a flow guide surface on the inner side of the water inlet flow channel. In the direction of the driving shaft into the pump shell, the flow guide surface gradually converges towards the driving shaft and forms a streamlined shape. On the one hand, the streamlined flow guide surface arranged in the water inlet flow channel can effectively improve the water inlet flow state and thus improve the cavitation performance. On the other hand, the flow guide surface starts from the motor shell, the outer surface of the motor shell is designed as part of the flow guide surface, and the motor shell constitutes part of the water inlet flow channel, so that the motor shell is closer to the pump shell in the structural design and the structure is more compact. BRIEF DESCRIPTION OF DRAWINGS

[0023] Figure 1 FIG. 1 is a schematic diagram of the internal structure of a compact submersible electric pump in an embodiment of the application.

[0024] Figure 2 FIG. 2 is a schematic diagram of the external structure of a compact submersible electric pump in an embodiment of the application.

[0025] Figure 3 FIG. 3 is a schematic diagram of the exploded structure of a compact submersible electric pump in an embodiment of the application.

[0026] Figure 4 FIG. 4 is a schematic diagram of the structure of a connecting shell in an embodiment of the application.

[0027] Figure 5 FIG. 5 is a schematic diagram of the structure of a motor assembly and a sealing device in an embodiment of the application.

[0028] FIG. 1 is a schematic diagram of the internal structure of a compact submersible electric pump in an embodiment of the application. DETAILED DESCRIPTION

[0029] The following are specific embodiments of the present application and further describe the technical solutions of the present application in conjunction with the drawings, but the present application is not limited to these embodiments. In the following description, specific details such as specific configurations and components are provided only to help a comprehensive understanding of the embodiments of the present application. Therefore, it should be clear to those skilled in the art that various changes and modifications can be made to the embodiments described herein without departing from the scope and spirit of the present application. In addition, descriptions of known functions and structures are omitted for clarity and brevity.

[0030] It should be noted that the embodiments and features in the present application can be combined with each other without conflict.

[0031] The submersible electric pump can be applied to flood prevention, drought resistance and other emergency rescue operations. Due to the poor on-site water inlet conditions of emergency rescue, the submersible electric pump has a small submersion depth. In order to ensure stable and efficient operation of the unit, the cavitation superior structure of the electric pump is crucial to the operation of the equipment. Therefore, the technical solution of the present application improves the cavitation performance of the compact submersible electric pump on the basis of the compact submersible electric pump.

[0032] Reference Figures 1-3 The embodiment of the present application provides a compact submersible electric pump, which comprises a motor assembly 10, a pump assembly 20, a sealing device 30 and a connecting shell 40. The motor assembly 10 comprises a motor shell 11, a motor internal structure 12 and a driving shaft 13; the motor internal structure 12 is contained in the motor shell 11, and the driving shaft 13 extends out of the motor shell 11. The pump assembly 20 comprises an impeller 21 and a pump shell 22; the pump shell 22 has a water inlet side and a water outlet side, the water inlet side faces the motor assembly 10, and the driving shaft 13 penetrates into the pump shell 22 from the water inlet side; the impeller 21 is contained in the pump shell 22 and is assembled on the driving shaft 13. The sealing device 30 is arranged on the outer periphery of the driving shaft 13 and is located on the side of the motor shell 11 close to the pump shell 22; the sealing device 30 comprises a sealing seat 31 and a sealing component 32 arranged in the sealing seat 31. The connecting shell 40 is located between the motor shell 11 and the pump shell 22 to form a connecting structure; the connecting shell 40 covers the outer periphery of the sealing seat 31. The above structure integrates the motor assembly and the pump assembly to form a compact submersible electric pump. Specifically, when the motor assembly 10 operates, the driving shaft 13 outputs power to drive the impeller 21 to rotate, and under the drive of the impeller 21, the water inlet side of the pump shell 22 intakes water and the water outlet side discharges water. The sealing device 30 is arranged on the water inlet side to prevent water flow from entering the motor shell 11.

[0033] It should be noted that the connecting housing 40 is located between the motor housing 11 and the pump housing 22 to form a connecting structure. Specifically, on the side of the pump housing 22, the connecting housing 40 can be directly connected with the pump housing 22; on the side of the motor housing 11, the connecting housing 40 can be connected with the motor housing 11 and / or the sealing seat 31. In Figure 1 In the structure shown, on the side of the motor housing 11, the connecting housing 40 is connected with the sealing seat 31.

[0034] Further, the pump assembly is a structure of an axial flow pump or a centrifugal pump. Referring to Figures 1-3 In a specific scheme, the pump assembly is a structure of an axial flow pump, the impeller is a structure of an axial flow pump impeller, the pump housing is provided with an impeller chamber, and a guide vane body is arranged on the water outlet side. In addition, in an embodiment of the present application, the sealing device 30 is a mechanical sealing device, which can be specifically provided as a double-end mechanical sealing device, each of the two ends is provided with a set of friction pairs, and the sealing seat is filled with lubricating oil to lubricate the mechanical seal and enhance the sealing effect of the mechanical seal.

[0035] Further, around the outer periphery of the driving shaft 13 and in the direction of the driving shaft 13 into the pump housing 22 in the axial direction, the motor housing 11, the sealing seat 31 and the connecting housing 40 jointly form a ring-shaped water inlet flow channel 50, and have a flow guide surface 51 on the inner side of the water inlet flow channel 50; and in the direction of the driving shaft 13 into the pump housing 22, the flow guide surface 51 gradually converges towards the driving shaft 13 and forms a streamlined shape. When the submersible electric pump is working, the driving shaft of the motor assembly 10 drives the impeller 21 to rotate, and the driving water flow enters the pump housing 22 from the axial direction along the water inlet flow channel 50. On the one hand, the streamlined flow guide surface 51 arranged in the water inlet flow channel 50 can effectively improve the water inlet flow state and thus improve the cavitation performance. On the other hand, the flow guide surface 51 starts from the motor housing 11, the outer surface of the motor housing 11 is designed as part of the flow guide surface 51, and the motor housing 11 constitutes part of the water inlet flow channel 50, which makes the motor housing 11 more close to the pump housing 22 and more compact in structure.

[0036] Referring to Figures 2-4 In an embodiment of the present application, the connecting housing 40 comprises a flow guide body 41, a connecting body 42 and a support 43; the flow guide body 41 is located on the side close to the motor housing 11; the support 43 is located on the side close to the pump housing 22 and is connected with the pump housing 22 together; and the connecting body 42 connects the flow guide body 41 and the support 43. In Figures 2-4 In the structure shown, around the outer periphery of the driving shaft 13, a plurality of connecting bodies 42 are arranged on the connecting housing 40 at intervals to serve as a connecting structure between the flow guide body 41 and the support 43, so that the flow guide body 41, the connecting body 42 and the support 43 form an integral whole. The pump housing 22 is installed on the support 43 and is fixed through the connecting relationship between the pump housing 22 and the support 43.

[0037] Reference Figure 1 The flow guide body 41 is wrapped around the outer periphery of the sealing seat 31, and the outer side surface thereof is a second section flow guide surface 512. In the direction of the driving shaft 13 into the pump housing 22, the sealing seat 31 partially extends out of the flow guide body 41, and the extended part forms a third section flow guide surface 513 in front of the second section flow guide surface 512. The outer side wall of the motor housing 11 forms a first section flow guide surface 511 near the flow guide body 41. The first section flow guide surface 511, the second section flow guide surface 512, and the third section flow guide surface 513 are connected in sequence to form the flow guide surface 51.

[0038] Specifically, the flow guide surface 51 is formed by the first section flow guide surface 511, the second section flow guide surface 512, and the third section flow guide surface 513, which are connected in sequence in the direction of the driving shaft 13 into the pump housing 22. The first section flow guide surface 511 is located on the outer side wall of the motor housing 11, the second section flow guide surface 512 is located on the flow guide body 41, and the third section flow guide surface 513 is located on the sealing seat 31. When water flows in, the water flows through the first section flow guide surface 511, the second section flow guide surface 512, and the third section flow guide surface 513 in sequence and enters the pump housing 22. This design makes full use of the water inlet structure of the pump housing 22, and processes the motor housing 11, the connecting housing 40, and the sealing seat 31 into a streamlined flow guide surface 51, which effectively improves the water inlet flow state and the cavitation performance of the compact submersible electric pump.

[0039] Reference Figures 2-4 In an embodiment of the present application, a plurality of plate-shaped connecting bodies 42 are arranged along the circumference of the water inlet flow channel 50 to divide the water inlet flow channel 50 into a plurality of sub-water inlet flow channels. Here, the plate-shaped connecting body 42 can be used to guide the water flow into the pump housing 22 when water flows in, and can prevent the generation of water flow pre-rotation in the water inlet flow channel, thereby improving the cavitation performance.

[0040] Further, the motor housing 11 is provided with a plurality of front flow guide plates 111 on the first section flow guide surface 511, and the front flow guide plates 111 are connected in sequence with the connecting bodies 42. Specifically, the front flow guide plates 111 are arranged on the first section flow guide surface 511, and the plate-shaped connecting bodies 42 are located on the second section flow guide surface 512, so that when the first section flow guide surface 511 and the second section flow guide surface 512 are connected together, the front flow guide plates 111 and the plate-shaped connecting bodies 42 are also connected together to form a more complete flow guide structure. When the water flow passes through the first section flow guide surface 511 and the second section flow guide surface 512 in sequence, the front flow guide plates 111 and the plate-shaped connecting bodies 42 guide the water flow in sequence.

[0041] refer to Figure 1 In one embodiment of this application, the inner structure of the guide fluid 41 and the sealing seat 31 are connected by a first bolt 61, and the sealing seat 31 is connected to the motor housing 11 by a second bolt 62. Both the first bolt 61 and the second bolt 62 are arranged within the space defined by the guide surface 51. Further, the guide fluid 41 has an opening 411 extending to the inner side on the second section of the guide surface 512, and the opening 411 corresponds one-to-one with the installation position of the first bolt 61. Here, the first bolt 61 can be inserted into the interior of the guide fluid 41 for assembly using the opening 411. Here, multiple first bolts 61 and second bolts 62 are provided and arranged at intervals along the circumferential direction.

[0042] Specifically, the sealing seat 31 is fixed to the motor housing 11 by the second bolt 62, and the guide fluid 41 is fixed to the sealing seat 31 by the first bolt 61. The bolted connection is detachable, allowing the guide fluid 41 to be separated from the sealing seat 31. In this design, the first bolt 61 and the second bolt 62 are arranged inside the structure, that is, within the guide surface 51, which will not damage the shape of the guide surface 51 and will not obstruct the water flow in the inlet channel 50.

[0043] In one exemplary assembly method, the sealing seat 31 is first fixed to the motor housing 11 using the second bolt 62, forming as shown. Figure 5 The structure shown is in Figure 5 In the middle, multiple second bolts 62 are installed at intervals along the circumference of the sealing seat 31. Then, the guide fluid 41 is fixed to the sealing seat 31 using the first bolts 61. In addition, when it is necessary to remove the guide fluid 41 from the sealing seat 31, only the first bolts 61 need to be removed, without affecting the connection between the sealing seat 31 and the motor housing 11 or the sealing structure inside the sealing seat 31.

[0044] In one embodiment of this application, the sealing seat 31 is detachably connected to the end of the motor housing 11; the connecting housing 40 is detachably connected to the sealing seat 31 and the pump housing 22 respectively; the impeller 21 is detachably mounted on the drive shaft 13. Specifically, in Figures 1-3In the shown structure, the connecting shell 40 comprises a flow guide 41, a connecting body 42, and a support 43, wherein the flow guide 41 is connected to the sealing seat 31 by bolts, and the support 43 is connected to the pump shell 22 by bolts, so that the connecting shell 40, the pump shell 22, and the impeller 21 can be disassembled and replaced. On the one hand, the pump assembly 20 comprises the impeller 21 and the pump shell 22, which are detachably installed and can be maintained and disassembled and replaced when damaged. On the other hand, based on the above disassembly design, different types or different specifications of hydraulic pump assemblies can be replaced according to specific working conditions during use. Further, the compact submersible electric pump is configured with multiple pump assemblies 20 of different types, and the multiple pump assemblies 20 of different types can be installed and replaced with each other.

[0045] It should be noted that the performance of a single pump is limited by the adjustable range of the hydraulic component (pump assembly), and the adaptability to complex and variable situations on site is limited. The above design allows the compact submersible electric pump to replace different types of pump assemblies, so that the performance of the pump can be greatly adjusted by replacing different pump assemblies to better cope with complex and variable situations on site.

[0046] Therefore, the present application provides a compact submersible electric pump, a connecting shell is located between a motor shell and a pump shell to form a connecting structure; the connecting shell is wrapped around an outer periphery of a sealing seat. Around an outer periphery of the drive shaft and in a direction of the drive shaft into the pump shell, the motor shell, the sealing seat, and the connecting shell collectively form a ring-shaped water inlet flow channel, and have a flow guide surface on an inner side of the water inlet flow channel; and, in the direction of the drive shaft into the pump shell, the flow guide surface gradually converges towards the drive shaft and forms a streamlined shape. On the one hand, the streamlined flow guide surface arranged in the water inlet flow channel can effectively improve the water inlet flow state, thereby improving the cavitation performance. On the other hand, the flow guide surface starts from the motor shell, the outer surface of the motor shell is designed as part of the flow guide surface, and the motor shell constitutes part of the water inlet flow channel, so that the motor shell is closer to the pump shell in the structural design, and the structure is more compact.

[0047] In addition, the connecting shell comprises a flow guide, a connecting body, and a support; wherein the flow guide is located on the side close to the motor shell; and the support is located on the side close to the pump shell and connected to the pump shell. Here, the connecting body is designed as a plate structure, and a front flow guide plate is arranged on the motor shell, the front flow guide plate and the connecting body are connected one by one, which can effectively guide the flow and prevent water flow pre-rotation in the water inlet flow channel, thereby improving the cavitation performance.

[0048] In the above embodiments of the present application, the description of each embodiment has its own focus, and the parts not described in detail in a certain embodiment can be referred to the related description of other embodiments.

[0049] Furthermore, the terms "first", "second", etc. are used herein only to describe the different instances of the same feature and are not intended to indicate or imply relative importance or a number of indications of the technical features indicated. Thus, features defined with "first", "second" can explicitly or implicitly include at least one of the features. In the description of the present application, the meaning of "plurality" is at least two, for example two, three, etc., unless otherwise explicitly and specifically limited. It is to be noted that the terms used herein are only for the purpose of describing the specific embodiments, and are not intended to limit the exemplary embodiments according to the present application. As used herein, the singular form is intended to include the plural form as well, unless the context clearly indicates otherwise, and furthermore, it should be understood that the use of the term "comprise" and / or "include" in the description herein indicates the presence of the features, steps, operations, devices, components and / or combinations thereof.

[0050] The specific embodiments described herein are merely illustrative of the application of the principles of the present application. Numerous modifications and adaptations thereof will be apparent to those skilled in the art without departing from the spirit and scope of the present application.

Claims

1. A compact submersible electric pump, characterized in that, The compact submersible pump includes: The motor assembly includes a motor housing, an internal motor structure housed within the motor housing, and a drive shaft extending outside the motor housing; A pump assembly includes an impeller and a pump housing; the pump housing has an inlet side and an outlet side, wherein the inlet side faces the motor assembly, and the drive shaft passes through the pump housing from the inlet side; the impeller is housed within the pump housing and mounted on the drive shaft; A sealing device is arranged on the outer periphery of the drive shaft and located on the side of the motor housing close to the pump housing; the sealing device includes a sealing seat and a sealing component arranged inside the sealing seat; A connecting housing is located between the motor housing and the pump housing to form a connection structure; the connecting housing covers the outer periphery of the sealing seat; Around the outer periphery of the drive shaft and in the direction of entering the pump housing along the axial direction of the drive shaft, the motor housing, the sealing seat, and the connecting housing together form a circumferential water inlet channel, and have a guide surface on the inner side of the water inlet channel; and, in the direction of entering the pump housing along the axial direction of the drive shaft, the guide surface gradually approaches the drive shaft and converges to form a streamline shape.

2. The compact submersible electric pump according to claim 1, characterized in that, The connecting housing includes a fluid guide, a connector, and a support; wherein the fluid guide is located on the side closer to the motor housing; the support is located on the side closer to the pump housing and is connected to the pump housing; the connector connects the fluid guide and the support. The fluid guide covers the outer periphery of the sealing seat, and its outer surface is the second flow guide surface; in the direction of entering the pump housing along the axial direction of the drive shaft, the sealing seat partially extends out of the fluid guide, and the extended part forms a third flow guide surface in front of the second flow guide surface; the outer wall of the motor housing forms a first flow guide surface near the fluid guide. The first section of the flow guiding surface, the second section of the flow guiding surface, and the third section of the flow guiding surface are sequentially connected together to form the flow guiding surface.

3. The compact submersible electric pump according to claim 2, characterized in that, Multiple plate-shaped connectors are arranged at intervals around the circumference of the water inlet channel to divide the water inlet channel into multiple sub-water inlet channels.

4. The compact submersible electric pump according to claim 3, characterized in that, The motor housing has multiple front guide plates arranged on the first section of the guide surface, and the front guide plates are connected to the connecting body in a one-to-one correspondence.

5. The compact submersible electric pump according to claim 2, characterized in that, The inner structure of the guide fluid and the sealing seat are connected by a plurality of first bolts, and the sealing seat is connected to the motor housing by a plurality of second bolts; both the first bolts and the second bolts are arranged within the space defined by the guide surface.

6. The compact submersible electric pump according to claim 5, characterized in that, The guide fluid has an opening extending to the inside on the second section of the guide surface, and the opening corresponds one-to-one with the installation position of the first bolt.

7. The compact submersible electric pump according to claim 1, characterized in that, The sealing seat is detachably connected to the end of the motor housing; the connecting housing is detachably connected to the motor housing and the sealing seat respectively; the impeller is detachably mounted on the drive shaft.

8. The compact submersible electric pump according to claim 7, characterized in that, The compact submersible pump is equipped with multiple different types of pump components, and these multiple different types of pump components can be installed interchangeably.

9. The compact submersible electric pump according to claim 1, characterized in that, The pump assembly is an axial flow pump structure or a centrifugal pump structure.

10. The compact submersible electric pump according to claim 1, characterized in that, The sealing device is a double-end mechanical seal.

Images