Permanent magnet full-through-flow electric pump with labyrinth shaft seal structure

Abstract

This invention belongs to the field of axial flow pump technology and provides a permanent magnet full-flow electric pump with a labyrinth-type shaft seal structure. It includes a suction chamber, an impeller, and a discharge cylinder coaxially connected in sequence. The impeller is rotatably connected between the suction chamber and the discharge cylinder via a connecting shaft. A bearing is installed between the impeller and the connecting shaft. Shaft seal sleeves are installed at both ends of the impeller, and these sleeves enclose the bearings in the middle. The shaft seal sleeves form a structure that blocks contaminants between the suction chamber and the discharge cylinder. This contaminant-blocking structure includes a labyrinth gap one, a sedimentation chamber, and a labyrinth gap two connected sequentially from the outside in. Both labyrinth gap one and labyrinth gap two are multi-stage continuous bending structures. This achieves graded blocking and retention of minute contaminants carried in the water, greatly reducing the possibility of contaminants contacting the bearings and connecting shaft, and improving the durability and reliability of the electric pump in water containing contaminants.

Description

Technical Field

[0001] This invention belongs to the field of axial flow pump technology, and particularly relates to a permanent magnet full axial flow electric pump with a labyrinth shaft seal structure. Background Technology

[0002] When axial flow pumps are used in natural water bodies, it is difficult to avoid the presence of contaminants in the water. If obstruction components or structures are installed, some tiny hard contaminants can enter the shaft seal structure, causing wear and affecting the service life of bearings and rotating parts. Summary of the Invention

[0003] This application addresses the shortcomings of existing permanent magnet axial flow electric pumps, which suffer from the difficulty of preventing contaminants from entering the shaft seal structure and causing wear, thus affecting the service life of bearings and rotating components. It proposes a composite shaft seal structure consisting of a labyrinth gap one, a sedimentation chamber, and a labyrinth gap two connected sequentially from the outside in. This structure effectively blocks and retains minute contaminants carried in the water, significantly reducing the likelihood of contaminants contacting the bearings and connecting shafts. Furthermore, the sedimentation chamber reduces the mating area between the shaft seal sleeve and the fixed seat, lowering the risk of contaminants accumulating in the labyrinth gaps and causing rotational obstruction. This improves operational stability, more effectively protects the bearings, connecting shafts, and shaft holes, reduces wear, and enhances the pump's durability and reliability in contaminated water.

[0004] The specific technical solution is as follows: A permanent magnet through-flow electric pump with a labyrinth-type shaft seal structure includes a suction chamber, an impeller, and a discharge cylinder connected coaxially in sequence. The impeller is rotatably connected between the suction chamber and the discharge cylinder via a connecting shaft. A bearing is provided between the impeller and the connecting shaft. Shaft seal sleeves are installed at both ends of the impeller. The shaft seal sleeves are fitted onto the connecting shaft to enclose the bearings in the middle. The shaft seal sleeves form a structure that blocks dirt between the suction chamber and the discharge cylinder. The structure that blocks dirt includes a labyrinth gap one, a sedimentation chamber, and a labyrinth gap two connected sequentially from the outside to the inside. Both labyrinth gap one and labyrinth gap two are multi-stage continuous bending structures.

[0005] According to the present invention, a permanent magnet full-flow electric pump with a labyrinth shaft seal structure is provided, wherein a guide vane body is provided inside the suction chamber, the center of the guide vane body is a fixed seat, and the center of the fixed seat has a shaft hole for fitting and inserting a connecting shaft.

[0006] According to the permanent magnet full-flow electric pump with a labyrinth-type shaft seal structure provided by the present invention, in the structure for blocking dirt formed between the shaft seal sleeve and the suction chamber, the sedimentation chamber is disposed on the fixed base.

[0007] According to the present invention, a permanent magnet full-flow electric pump with a labyrinth shaft seal structure is provided, wherein a guide vane body 2 is provided inside the water outlet cylinder, and a fixed seat 2 is located at the center of the guide vane body 2. The fixed seat 2 has a shaft hole at the center for fitting and inserting one end of a connecting shaft.

[0008] According to the permanent magnet full-flow electric pump with a labyrinth-type shaft seal structure provided by the present invention, in the structure for blocking dirt formed between the shaft seal sleeve and the outlet cylinder, the sedimentation chamber is arranged on the fixed seat two.

[0009] According to the present invention, the permanent magnet full-flow electric pump with a labyrinth shaft seal structure has an inner side of the impeller configured as an annular connecting sleeve, and the bearing is fixed between the connecting sleeve 2 and the connecting shaft.

[0010] The permanent magnet full-flow electric pump with a labyrinth-type shaft seal structure provided by the present invention has the shaft seal sleeve fixed to the end face of the connecting sleeve.

[0011] According to the present invention, a permanent magnet full-flow electric pump with a labyrinth-type shaft seal structure is provided. The labyrinth gap includes a connected back bend structure and a stepped bend structure. The back bend structure has a first section and a last section with opposite directions, and a transition section connecting the first section and the last section. The stepped bend structure is formed by connecting a series of identical L-shaped bends.

[0012] The permanent magnet full-flow electric pump with a labyrinth-type shaft seal structure provided by the present invention includes a labyrinth gap II comprising a series of connected identical L-shaped bends.

[0013] The permanent magnet full-flow electric pump with a labyrinth-type shaft seal structure provided by the present invention includes a series of interconnected loop structures, wherein the loop structure has a first section and a last section with opposite directions, and a transition section connecting the first section and the last section.

[0014] The beneficial effects of this invention are as follows: This application utilizes a composite shaft seal structure consisting of a labyrinth gap one, a sedimentation chamber, and a labyrinth gap two connected sequentially from the outside in. This structure enables graded blocking and retention of minute contaminants carried in the water, significantly reducing the likelihood of contaminants contacting the bearings and connecting shafts. Furthermore, the sedimentation chamber reduces the mating area between the shaft seal sleeve and the fixed seat, lowering the risk of contaminants accumulating in the labyrinth gaps and causing rotational obstruction. This improves operational stability, more effectively protects the bearings, connecting shafts, and shaft holes, reduces wear, and enhances the durability and reliability of the electric pump in contaminated water. Attached Figure Description

[0015] Figure 1 The diagram shown is a structural schematic of the permanent magnet full-flow electric pump of the present invention. Figure 2 As shown Figure 1A magnified view of a section at point A in the middle; Figure 3 The diagram shown is a schematic diagram of one structure of the labyrinth gap two in the permanent magnet full-flow electric pump of the present invention. Figure 4 The diagram shown is another structural schematic of the labyrinth gap two in the permanent magnet full-flow electric pump of the present invention. Figure 5 The diagram shown is another structural schematic of the labyrinth gap two in the permanent magnet full-flow electric pump of the present invention.

[0016] Figure label: 10-Suction chamber; 11-Guide vane body one; 12-Fixed seat one; 20-Impeller; 20a-Connecting sleeve; 21-Connecting shaft; 22-Bearing; 23-Shaft seal sleeve; 24-Mechanical seal sleeve; 30-Water outlet cylinder; 31-Guide vane body two; 32-Fixed seat two; 41-Motor housing; 42-Wet stator; 43-Permanent magnet rotor; 51-Labyrinth gap one; 52-Labyrinth gap two; 52a-First section; 52b-Transition section; 52c-Tail section; 52d-L-shaped bend; 52e-L-shaped bend; 52f-Return structure; 53-Sedimentation chamber. Detailed Implementation

[0017] In the following description, certain specific details are set forth in order to provide a thorough understanding of various embodiments. However, those skilled in the art will understand that the invention can be practiced without these details. In other instances, well-known structures have not been shown or described in detail to avoid unnecessarily obscuring the description of the embodiments. Unless the context otherwise requires, throughout the specification and appended claims, the word "comprising" should be interpreted in an open-ended, inclusive sense, i.e., as "including but not limited to".

[0018] Figure 1 This diagram shows the structure of the permanent magnet full-flow electric pump of the present invention, combined with... Figure 1 The coaxial structure watertight high-current connector of this invention includes: a water intake chamber 10, an impeller 20 and a water outlet cylinder 30 connected coaxially in sequence, wherein a motor housing 41 is also connected between the water intake chamber 10 and the water outlet cylinder 30, and the motor housing 41, the water intake chamber 10, the impeller 20 and the water outlet cylinder 30 enclose a motor cavity, and a motor component for driving the impeller 20 to rotate is installed in the motor cavity.

[0019] Combination Figure 1 The suction chamber 10, the motor housing 41 and the outlet cylinder 30 are fixedly connected to each other. The impeller 20 is located inside the motor housing 41. The motor components inside the motor cavity drive the impeller 20 to rotate, thereby pumping water from the suction chamber 10 along the pump body axial direction through the impeller 20 to the outlet cylinder 30.

[0020] Optionally, the suction chamber 10 and the motor housing 41 are provided with matching flanges and are fixedly connected by bolts; the motor housing 41 and the water outlet cylinder 30 are provided with matching flanges and are fixedly connected by bolts.

[0021] In the permanent magnet full-flow electric pump of this invention, and in the medium-high head full-flow submersible mixed-flow electric pump of this invention, the motor component that drives the impeller 20 to rotate includes a wet stator 42 and a permanent magnet rotor that cooperates with the wet stator 42. The wet stator 42 is fixed on the inner wall of the motor housing 41, and the permanent magnet rotor is integrated and fixed on the outer side of the impeller 20. When the wet stator 42 is energized, a magnetic force is generated between it and the permanent magnet rotor to drive the impeller 20 to rotate.

[0022] It should be noted that the motor components that drive the impeller 20 to rotate do not only include the wet stator 42 and the permanent magnet rotor 43, but are described and explained in order to illustrate the inventive intent of this application and to better aid understanding of the components and structures related to this application.

[0023] Since the impeller 20 is located inside the motor housing 41 and needs to meet the rotation requirements, a connecting shaft 21 is set in the middle of the impeller 20. The connecting shaft 21 is connected to the outer impeller 20 through a bearing 22, and the bearing 22 meets the rotation requirements of the impeller 20.

[0024] In the permanent magnet full-flow electric pump of this embodiment, a guide vane body 11 is provided inside the suction chamber 10. The center of the guide vane body 11 is a fixed seat 12. The center of the fixed seat 12 has a shaft hole. The shaft hole at the center of the fixed seat 12 is used to fit one end of the connecting shaft 21, which plays a role in fixing and supporting the connecting shaft 21.

[0025] In the permanent magnet full-flow electric pump of this invention, a guide vane body 31 is provided inside the water outlet cylinder 30. The center of the guide vane body 31 is a fixed seat 32. The center of the fixed seat 32 also has a shaft hole. The shaft hole at the center of the fixed seat 32 is also used to fit and insert the other end of the connecting shaft 21, so as to fix and support the connecting shaft 21.

[0026] Figure 2 Show Figure 1 A magnified view of a section at point A, combined with Figure 2 In the permanent magnet full-flow electric pump of this embodiment, the inner side of the impeller 20 is configured as an annular connecting sleeve 20a, so as to fix the bearing 22 between the connecting sleeve 20a and the connecting shaft 21.

[0027] In the permanent magnet full-flow electric pump of this embodiment, shaft seal sleeves 23 are respectively provided at both ends of the connecting sleeve 20a. The shaft seal sleeves 23 extend radially to the side wall of the connecting shaft 21, so that the bearing 22 is located between the shaft seal sleeves 23 on both sides, thereby playing the purpose of protecting the internal bearing 22.

[0028] In the permanent magnet full-flow electric pump of this embodiment, a mechanical seal sleeve 24 is provided between the connecting shaft 21 and the connecting sleeve 20a. The mechanical seal sleeve 24 further improves the sealing effect and prevents tiny dirt carried in the water flow from entering the bearing 22 and causing the bearing 22 to wear.

[0029] In the permanent magnet full-flow electric pump of this embodiment, the shaft seal sleeve 23 also cooperates with the fixed seat 12 and the fixed seat 32 to block the dirt in the water 1, so as to prevent the dirt in the water flow from entering the bearing 22 and causing wear of the bearing 22, and from entering the shaft hole at the end of the connecting shaft 21 and causing wear of the support at the end of the connecting shaft 21. These will further affect the stability of the impeller 20 rotation, and thus affect the operating efficiency of the permanent magnet full-flow electric pump.

[0030] In one embodiment of the permanent magnet full-flow electric pump of the present invention, the shaft seal sleeve 23 is fixedly installed on the end face of the connecting sleeve 20a by bolts, and a sealing structure or sealing element, such as a sealing ring, is provided on the contact surface of the two to ensure the sealing performance of the structure.

[0031] In the permanent magnet full-flow electric pump of this embodiment, the shaft seal sleeve 23, through the design of its cross-sectional shape, forms a labyrinth gap 51, a second labyrinth gap 52, and a sedimentation chamber 53 with the outer fixed seat 12. The labyrinth gap 51, the sedimentation chamber 53, and the second labyrinth gap 52 are connected sequentially from the outside to the inside, so that the water flow passing through the suction chamber 10 and the outlet cylinder 30 can carry tiny dirt into the labyrinth gap 51, and the tiny dirt carried in the water flow can be precipitated and stored in the sedimentation chamber 53. The water flow can further enter the second labyrinth gap 52, but the second labyrinth gap 52 will block the tiny dirt from the outside, thereby preventing the tiny dirt from contacting the central connecting shaft 21, and entering the bearing 22 and the shaft hole, which greatly delays the wear of the bearing 22, the connecting shaft 21, and the shaft hole.

[0032] In the permanent magnet full-flow electric pump of this invention, the cross-sections of labyrinth gap one 51 and labyrinth gap two 52 are both multi-channel continuous bending structures, which serve to prevent dirt from entering and passing through.

[0033] In the permanent magnet full-flow electric pump of this embodiment, a sedimentation chamber 53 is particularly special, which is provided between labyrinth gap one 51 and labyrinth gap two 52, instead of providing a labyrinth gap with a longer multi-bend structure. In contrast, although providing a labyrinth gap with a longer multi-bend structure can extend the distance for obstructing dirt, such a design will undoubtedly increase the difficulty of processing and assembly due to the large area of ​​assembly and machining precision control between the shaft seal sleeve 23 and the fixed seat one 12 and fixed seat two 32. On the other hand, once dirt accumulates in the labyrinth gap, the dirt will form a relative rotational resistance between the shaft seal sleeve 23 and the fixed seat one 12 and fixed seat two 32, affecting the stable rotation of the impeller 20.

[0034] In the permanent magnet full-flow electric pump of this embodiment, the settling chamber 53 not only reduces the mating area between the shaft seal sleeve 23 and the fixed seat 12 and the fixed seat 22, making it easier to assemble and process, but also the large volume of the settling chamber 53 in the middle position can greatly avoid the problem of dirt accumulation in the labyrinth gap causing rotational obstruction.

[0035] According to the permanent magnet full-flow electric pump of this application embodiment, the impeller 20 relies on the bearing 22 to rotate. Therefore, the two ends of the connecting shaft 21 are fixed and supported by the first fixed seat 12 and the second fixed seat 32 respectively. The first fixed seat 12 and the second fixed seat 32 are both stationary, that is, the sedimentation chamber 53 is also relatively stationary when the full-flow electric pump is working, which can better realize the function of sedimentation and storage of small dirt.

[0036] According to the permanent magnet full-flow electric pump of the present application embodiment, the functions of labyrinth gap one 51 and labyrinth gap two 52 are different. Labyrinth gap one 51 is mainly used to block large-volume dirt, but it cannot block small dirt from entering. Then, by cooperating with the sedimentation chamber 53, the small dirt that enters is precipitated and stored in the sedimentation chamber 53. Labyrinth gap two 52 is the key to prevent small dirt from entering the connecting shaft 21 of the contact center, and its shape setting is very important.

[0037] Figure 3 The image shows an embodiment of the labyrinth gap 52 in the permanent magnet full-flow electric pump provided in this application. The labyrinth gap 52 includes a connected bend structure and a stepped bend structure. The bend structure is characterized by the first and last sections having opposite directions, connected by a transition section in the middle. Figure 3 The first, transition, and final sections of the bend structure are shown in Figures 52a, 52b, and 52c, respectively. The stepped bend structure is characterized by being composed of multiple consecutive identical L-shaped bends connected together. Figure 3The L-shaped bend of the stepped bend structure is shown in Figure 52d; in this embodiment of the application, the stepped bend structure, as an extension of the bend structure, together form the labyrinth gap 2 52. Furthermore, "identical" L-shaped bends refer to bends that extend in the same horizontal and vertical directions, but do not limit the specific dimensions of the bend.

[0038] Figure 4 The image shows another embodiment of the labyrinth gap 52 in the permanent magnet full-flow electric pump provided in this application. The labyrinth gap 52 includes a series of consecutive identical L-shaped bends, that is, in this embodiment, the labyrinth gap 52 is entirely composed of L-shaped bends. Figure 4 The L-shaped bend of the stepped bend structure is shown in 52e.

[0039] Figure 5 The image shows another embodiment of the labyrinth gap 52 in the permanent magnet full-flow electric pump provided in this application. The labyrinth gap 52 includes a series of interconnected loop structures, that is, in this embodiment, the labyrinth gap 52 is entirely composed of loop structures. Figure 5 The L-shaped bend of the stepped bend structure is shown in Figure 52f.

[0040] During actual testing, it was found that, Figures 3 to 5 When different labyrinth gaps 252 are applied, they can all prevent tiny contaminants from entering the connecting shaft 21 at the contact center, but the effectiveness varies. Under the same test conditions, among them Figure 3 The labyrinth gap 2.52 shown has the best effect, with almost no tiny contaminants entering the connecting shaft 21 at the contact center, so the wear on the bearing 22 and mechanical seal sleeve 24 is minimal; while Figure 4 The labyrinth gap 2.52 shown has the worst effect, with some tiny contaminants entering the connecting shaft 21 at the contact center, resulting in greater wear on the mechanical seal sleeve 24 than expected. Figure 3 The application effect of the maze gap 2.52 shown; and Figure 5 After applying the labyrinth gap 2.52 shown, it was found that although almost no tiny contaminants entered the connecting shaft 21 at the contact center, the wear of the bearing 22 and the mechanical seal sleeve 24 was similar to that of the connecting shaft 21 at the contact center. Figure 3 The application effects of the maze gap 2 52 shown are almost the same, but the maze gap 2 52 itself has more obvious wear and scratches.

[0041] In this application, the same test conditions refer to the same water environment, electric pump parameters, and test duration.

[0042] The above embodiments are only used to illustrate the technical solutions of the present invention, and are not intended to limit it.

Claims

1. A permanent magnet full-flow electric pump with a labyrinth-type shaft seal structure, comprising a suction chamber, an impeller, and a discharge cylinder coaxially connected in sequence, wherein the impeller is rotatably connected between the suction chamber and the discharge cylinder via a connecting shaft, characterized in that, A bearing is provided between the impeller and the connecting shaft. Shaft seals are installed at both ends of the impeller. The shaft seals are fitted onto the connecting shaft to enclose the bearing in the middle. The shaft seals form a structure that blocks dirt between the water suction chamber and the water outlet cylinder. The structure that blocks dirt includes a labyrinth gap one, a sedimentation chamber and a labyrinth gap two connected sequentially from the outside to the inside. Both labyrinth gap one and labyrinth gap two are multi-stage continuous bending structures.

2. The permanent magnet full-flow electric pump with a labyrinth-type shaft seal structure according to claim 1, characterized in that, The water absorption chamber is provided with a guide vane body, and the center of the guide vane body is a fixed seat. The center of the fixed seat has a shaft hole for fitting and inserting a connecting shaft.

3. The permanent magnet full-flow electric pump with a labyrinth-type shaft seal structure according to claim 2, characterized in that, In the structure that blocks dirt between the shaft seal sleeve and the water absorption chamber, the sedimentation chamber is located on the fixed base.

4. The permanent magnet full-flow electric pump with a labyrinth-type shaft seal structure according to claim 1, characterized in that, The water outlet cylinder is equipped with a guide vane body II. The center of the guide vane body II is a fixed seat II. The center of the fixed seat II has a shaft hole for fitting and inserting one end of the connecting shaft.

5. The permanent magnet full-flow electric pump with a labyrinth-type shaft seal structure according to claim 4, characterized in that, In the structure that blocks dirt between the shaft seal sleeve and the water outlet cylinder, the sedimentation chamber is located on the fixed base two.

6. The permanent magnet full-flow electric pump with a labyrinth-type shaft seal structure according to claim 1, characterized in that, The inner side of the impeller is configured as an annular connecting sleeve, and the bearing is fixed between the connecting sleeve 2 and the connecting shaft.

7. The permanent magnet full-flow electric pump with a labyrinth-type shaft seal structure according to claim 6, characterized in that, The shaft seal is fixed to the end face of the connecting sleeve.

8. The permanent magnet full-flow electric pump with a labyrinth shaft seal structure according to claim 1, characterized in that, The second labyrinth gap includes a connected loop structure and a stepped bend structure. The loop structure has a first segment and a last segment with opposite directions, as well as a transition segment connecting the first segment and the last segment. The stepped bend structure is formed by connecting multiple identical L-shaped bends.

9. The permanent magnet full-flow electric pump with a labyrinth shaft seal structure according to claim 1, characterized in that, The second labyrinth gap includes a series of consecutive identical L-shaped bends.

10. The permanent magnet full-flow electric pump with a labyrinth shaft seal structure according to claim 1, characterized in that, The second labyrinth gap includes a series of interconnected loop structures, each loop structure having a first and a last segment with opposite directions, and a transition segment connecting the first and last segments.

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