Axial gap adjustable assembly structure of permanent magnet submersible pump impeller

Abstract

The application relates to the technical field of submersible pumps, and discloses an assembly structure with adjustable axial gap of a permanent-magnetic submersible pump impeller, which comprises a main body and a water compression cavity fixed with the main body, the main body is internally provided with an output shaft, the output shaft output end is provided with an impeller assembly located in the water compression cavity, the impeller assembly comprises: a back cover plate, which is in contact with the inner wall of one side of the water compression cavity, the outer side surface is connected with the output shaft, and the inner side surface is provided with blade one; a front cover plate, which is in contact with the inner wall of the other side of the water compression cavity, the inner side surface is provided with blade two, and the blade two is in sliding cooperation with the blade one to form the blade rotating with the impeller; and a supporting part, which is fixed to the inner side of the back cover plate, extends through the front cover plate, supports the front cover plate, and is provided with a gap between the front cover plate and the supporting part. The front cover plate is always in close contact with the inner wall of the water compression cavity under the action of the elastic supporting part and the hydraulic reaction force. Even if the front cover plate is eroded and worn by solid particles, the front cover plate can automatically move forward to fill the gap, and the problem that the gap is enlarged to cause leakage after the traditional sealing ring is worn is solved.

Description

Technical Field

[0001] This invention relates to the field of submersible pump technology, specifically to an adjustable axial clearance assembly structure for a permanent magnet submersible pump impeller. Background Technology

[0002] When a submersible pump is operating, the impeller inlet is a low-pressure zone, and the impeller pressure chamber is a high-pressure zone. The impeller connects these two different pressure zones, and its rotation drives the liquid flow. There is a certain gap between the impeller and the cover surface on the pump cover inlet side. If this gap is too large, a significant portion of the high-pressure liquid, driven by the impeller and having gained energy, will leak directly back to the impeller inlet through this gap. This leaked liquid completely loses its energy, contributing nothing to the submersible pump's effective head and flow rate, wasting motor input power, and reducing the pump's volumetric efficiency. Therefore, it is necessary to adjust this gap to control it within a reasonable minimum range while avoiding friction, thereby minimizing internal circulation leakage of high-pressure liquid to the low-pressure zone and improving the pump's volumetric and overall efficiency.

[0003] However, when a submersible pump is running, if the liquid being pumped contains a certain amount of particulate matter, the high-speed rotation of the impeller will cause the particulate matter to gain kinetic energy and produce a "sandpaper" effect, continuously rubbing against the impeller. This causes the material to be gradually worn away, and the gap between the impeller and the pump cover inlet side is gradually eroded, resulting in an increased gap. Consequently, a large amount of high-pressure water discharged from the impeller outlet will flow back to the low-pressure area through this increased gap, and will no longer contribute to the pump's effective flow rate and head. Summary of the Invention

[0004] The purpose of this invention is to provide an adjustable assembly structure for the axial clearance of a permanent magnet submersible pump impeller, so as to solve the problems mentioned in the background art.

[0005] To solve the above-mentioned technical problems, the present invention provides the following technical solution: an adjustable axial clearance assembly structure for a permanent magnet submersible pump impeller, comprising a main body and a pressure chamber fixed to the main body, an output shaft inside the main body, and an impeller assembly located in the pressure chamber mounted at the output end of the output shaft. The impeller assembly includes:

[0006] The rear cover plate contacts the inner wall of the water pressure chamber on one side, the outer side is connected to the output shaft, and the inner side has a blade.

[0007] The front cover plate contacts the inner wall on the other side of the water pressure chamber. The inner side has two blades that slide with one blade to form blades for impeller rotation.

[0008] The support is fixed to the inside of the rear cover and extends through the front cover to support the front cover. There is a gap between the front cover and the support, so that the front cover remains in contact with the inner wall of the other side of the water pressure chamber after it is eroded by particles.

[0009] Furthermore, the output shaft extends from the main body into the water pressure chamber, and the end of the output shaft has a first fastening edge, while the outer side of the rear cover plate has a second fastening edge that mates with the first fastening edge. The output shaft and the rear cover plate are fixed together by bolts.

[0010] Furthermore, both blade one and blade two extend in an arc shape, are located on the same arc-shaped extension path and are in contact with each other, and blade one and blade two are distributed at different heights.

[0011] Furthermore, both blade one and blade two have blade edges on their sides, and the axes of both blade edges coincide with the axes of the rear cover plate and the front cover plate. When one set of blade one and blade two is fixed and the other set rotates, a cutting action is formed.

[0012] Furthermore, the outer end face of the second blade is provided with an elastic support portion, which supports the rear cover plate and is used to push the second blade and the front cover plate away from each other, so that the front cover plate contacts the inner wall of the other side of the water pressure chamber.

[0013] Furthermore, the elastic support part includes a support shaft and a support spring. The outer end face of the second blade has a support cavity hole extending along the axis of the front cover plate. The support spring is located in the support cavity hole, and its outer end is fixed to the support shaft. One end of the support shaft and the support spring is fixed to the support cavity hole, and the other end is attached to the rear cover plate.

[0014] Furthermore, the support includes an annular frame, a buckle layer, and blade three. Blade three is fixed between the annular frame and the rear cover plate and is used to connect the annular frame and the rear cover plate. The buckle layer is integrally formed on the outside of the annular frame.

[0015] An inlet is provided through the axis of the front cover plate. The inlet is matched with the liquid entry position of the pressurized water chamber. The inner wall of the inlet has an outwardly extending groove. The annular frame and the buckle layer are respectively embedded in the inlet and the groove.

[0016] Furthermore, the annular frame and the fastening layer are flush with the outer side of the front cover plate, and the thickness of the annular frame and the fastening layer is less than the thickness of the front cover plate.

[0017] The inner side of the front cover plate is fixed with a thick layer to cover the buckle groove, and the thick layer is integrally formed with the blade.

[0018] Furthermore, the third blade is located on the inward extension line of the second blade and is in contact with the inner surface of the second blade.

[0019] Furthermore, both sides of the third blade are set with cutting edges, and the axis of the cutting edge of the third blade coincides with the axis of the front cover plate. When the second blade rotates, it forms a cutting action with the third blade.

[0020] Compared with the prior art, the beneficial effects achieved by the present invention are:

[0021] 1. Under the action of the elastic support and the hydraulic reaction force, the front cover plate always remains tightly attached to the inner wall of the pressure chamber. Even if it is eroded and worn by solid particles, it can automatically move forward to fill the gap, completely solving the problem of leakage caused by the expansion of gaps after the wear of traditional sealing rings.

[0022] 2. The support spring continuously provides outward thrust to ensure that the front cover plate remains in contact with the cavity wall when the machine stops. When the impeller rotates, the liquid reaction force pushes the front cover plate outward to form a flexible seal and avoid hard friction jamming.

[0023] 3. Since the front cover plate needs to be supported outward, blades one, two, and three are designed with a cutting edge structure to cut through the tangled strip-shaped impurities during relative movement and prevent blockage. Attached Figure Description

[0024] The accompanying drawings are provided to further illustrate the invention and form part of the specification. They are used in conjunction with embodiments of the invention to explain the invention and do not constitute a limitation thereof. In the drawings:

[0025] Figure 1 This is a schematic diagram of the overall structure of the present invention;

[0026] Figure 2 This is a schematic diagram of the half-section structure of the water pressure chamber of the present invention;

[0027] Figure 3 This is an exploded view of the impeller assembly and output shaft of the present invention;

[0028] Figure 4 This is an exploded view of the impeller assembly of the present invention;

[0029] Figure 5 This is a schematic diagram of the front cover plate and its upper component structure of the present invention;

[0030] Figure 6 This is a schematic diagram of a partial cross-sectional structure of the blade of the present invention;

[0031] Figure 7 This is the present invention. Figure 6 A magnified schematic diagram of the structure of part A in the diagram;

[0032] Figure 8 This is a schematic diagram of the structure of the rear cover plate and its upper part of the present invention;

[0033] Figure 9 This is a schematic diagram of a partial longitudinal section of the impeller assembly of the present invention;

[0034] Figure 10 This is a schematic diagram of the main structure of the impeller assembly of the present invention;

[0035] Figure 11The impeller assembly of the present invention is along Figure 10 Schematic diagram of the cross section in the AA direction;

[0036] Figure 12 This is a schematic diagram of the structure where the rear cover plate and the front cover plate of the present invention are close to each other.

[0037] In the diagram: 1. Main body; 2. Pressure chamber; 3. Output shaft; 31. Edge fastening one; 4. Impeller assembly; 41. Rear cover plate; 411. Edge fastening two; 412. Blade one; 42. Front cover plate; 421. Blade two; 422. Thick layer; 423. Inlet; 424. Fastening groove; 43. Support part; 431. Ring frame; 432. Fastening layer; 433. Blade three; 44. Elastic support part; 441. Support shaft; 442. Support spring; 443. Support cavity hole. Detailed Implementation

[0038] The technical solutions of the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of the present invention, and not all embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of the present invention.

[0039] Please see Figures 1-12 This invention provides a technical solution: Submersible pump impellers are not all identical; different impellers can be configured according to different usage environments or conditions. Currently, the suction inlet of the submersible pump is a low-pressure zone, while the periphery of the pressure chamber 2 is a high-pressure zone. There is a very small gap between the impeller near the low-pressure zone and the pressure chamber 2, typically on the order of 0.1-0.5 mm. Current technology generally uses a sealing ring or sealing ring in this gap area to reduce leakage. Based on this problem, an adjustable axial clearance assembly structure for the impeller of a permanent magnet submersible pump is proposed. Figures 1-4 As shown, the device includes a main body 1 and a water-pressing chamber 2 fixed to the main body 1. The main body 1 has an output shaft 3, and an impeller assembly 4 located in the water-pressing chamber 2 is installed at the output end of the output shaft 3. The impeller assembly 4 includes:

[0040] The rear cover plate 41 is in contact with the inner wall of one side of the water pressure chamber 2, the outer side is connected to the output shaft 3, and the inner side has a blade 412.

[0041] The front cover plate 42 contacts the inner wall of the other side of the water pressure chamber 2. The inner side has a second blade 421, which slides with a first blade 412 to form blades for impeller rotation.

[0042] The support part 43 is fixed to the inner side of the rear cover plate 41 and extends through the front cover plate 42 to support the front cover plate 42. There is a gap between the front cover plate 42 and the support part 43, so that the front cover plate 42 remains in contact with the inner wall of the other side of the water pressure chamber 2 after being eroded by particles.

[0043] Specifically, the main body 1 is a submersible pump, which has a pressure chamber 2 and an output shaft 3 as a rotating shaft to drive the impeller assembly 4 to rotate. The impeller assembly 4 is divided into a rear cover plate 41, a front cover plate 42, and a support part 43. The rear cover plate 41 is fixed to the support part 43, and the front cover plate 42 is slidably mounted on the support part 43. The position of the front cover plate 42 can be adjusted so that it fits against the inner wall of the pressure chamber 2, isolating any gaps as much as possible. It should be noted that although existing technologies use sealing rings or sealing rings to reduce leakage, they are easily corroded by particles in high-speed moving liquids. During use, this leads to a continuous increase in gaps, and the impact only becomes greater, failing to maintain the effect of reducing leakage. However, even if the front cover plate 42 is corroded, it still fits against the inner wall of the pressure chamber 2, achieving a stable function. It should also be noted that when the impeller assembly 4 is operating, the liquid is driven to enter the high-pressure zone. The driven liquid exerts a reaction force on the impeller assembly 4, causing it to support the impeller assembly 4 in the opposite direction, ensuring that the front cover plate 42 is in contact with the inner wall of the pressure chamber 2. The force of the liquid drive is a flexible action and will not cause the impeller assembly 4 to be unable to rotate. Furthermore, even if the front cover plate 42 is corroded, the liquid reaction force remains unchanged, keeping the front cover plate 42 in contact with the inner wall of the pressure chamber 2.

[0044] like Figure 3 As shown, the output shaft 3 extends from the main body 1 into the water pressure chamber 2. The end of the output shaft 3 has a fastening edge 31, and the outer side of the rear cover plate 41 has a fastening edge 411 that cooperates with the fastening edge 31. The output shaft 3 and the rear cover plate 41 are fixed together by bolts.

[0045] Specifically, the output shaft 3 is first fastened to the rear cover plate 41 by fastening edge 31 and fastening edge 411, and then fixed by bolts to fix the impeller assembly 4 and the output shaft 3.

[0046] like Figures 9-11 As shown, blade 412 and blade 421 both extend in an arc shape, and are located on the same arc-shaped extension path and in contact with each other. Blade 412 and blade 421 are distributed at different heights.

[0047] Specifically, blade 412 and blade 421 are both used to drive the liquid. Blade 412 and blade 421 are arranged at different heights, one above the other. In the attached figure, the span of blade 412 and blade 421 is increased to make them more distinct. In actual use, the stepped surfaces of blade 412 and blade 421 can be set as fine gaps, which can be adjusted according to the space inside the water pressure chamber 2 so that the liquid driving of blade 412 and blade 421 is almost the same as that of ordinary blade driving. The one above the other height distribution allows the front cover plate 42 to move outward locally, minimizing the gap between it and the water pressure chamber 2.

[0048] like Figure 5 and Figure 8 As shown, the sides of blade 412 and blade 421 are both bladed, and the axes of the blades of both are coincident with the axes of the rear cover plate 41 and the front cover plate 42. When one set of blade 412 and blade 421 is fixed and the other set rotates, a cutting action is formed.

[0049] Specifically, the edges of blade 412 and blade 421 are both cutting surfaces. When one blade 412 remains stationary while the other rotates, a cutting action is generated, and residual impurities are easily cut off, thus reducing the amount of impurities remaining inside the impeller assembly 4.

[0050] like Figures 6-7 As shown, the outer end face of the second blade 421 is provided with an elastic support part 44, which supports the rear cover plate 41 and is used to push the second blade 421 and the front cover plate 42 away from each other, so that the front cover plate 42 contacts the inner wall of the other side of the water pressure chamber 2.

[0051] The elastic support part 44 includes a support shaft 441 and a support spring 442. The outer end face of the blade 421 is provided with a support cavity hole 443 extending along the axis of the front cover plate 42. The support spring 442 is located in the support cavity hole 443, and its outer end is fixed to the support shaft 441. One end of the support shaft 441 and the support spring 442 are fixed to each other and extend into the support cavity hole 443. The other end is attached to the rear cover plate 41.

[0052] Specifically, the front cover plate 42 and the second blade 421 are supported by the support shaft 441 and the support spring 442. It should be noted that the support spring 442 is always in a compressed state, and one end of the support shaft 441 always extends into the support cavity 443 to ensure an outward pushing effect. When the submersible pump is not working, the front cover plate 42 is also supported to maintain the cooperation between the front cover plate 42 and the support part 43.

[0053] like Figure 4 , Figure 9 and Figure 12 As shown, the support part 43 includes an annular frame 431, a fastening layer 432 and a blade 433. The blade 433 is fixed between the annular frame 431 and the rear cover plate 41 and is used to connect the annular frame 431 and the rear cover plate 41. The fastening layer 432 is integrally formed on the outside of the annular frame 431.

[0054] An inlet 423 is provided through the axis of the front cover plate 42. The inlet 423 is matched with the liquid entry position of the water pressure chamber 2. The inner wall of the inlet 423 has an outwardly extending groove 424. The annular frame 431 and the buckle layer 432 are respectively embedded in the inlet 423 and the groove 424.

[0055] Specifically, the support part 43 includes an annular frame 431, a fastening layer 432, and a blade 433. The annular frame 431 and the fastening layer 432 are integrated, and the blade 433 is used to fix the annular frame 431 to the rear cover plate 41. The annular frame 431 and the fastening layer 432 cooperate with the inlet 423 and the fastening groove 424 respectively to limit the front cover plate 42, so that the front cover plate 42 can rotate together with the rear cover plate 41.

[0056] like Figure 9 As shown, the ring frame 431 and the buckle layer 432 are flush with the outer side of the front cover plate 42, and the thickness of the ring frame 431 and the buckle layer 432 is less than the thickness of the front cover plate 42.

[0057] The inner side of the front cover plate 42 is fixed with a thick layer 422 for covering the buckle groove 424. The thick layer 422 is integrally formed with the blade 421.

[0058] like Figure 9 As shown, the front cover plate 42 has a certain space for downward movement. Only after moving downward a certain space can the thick layer 422 and the fastening layer 432 be attached. On this basis, the elastic support part 44 can push the front cover plate 42 outward to keep it attached to the inner wall of the water pressure chamber 2. Even if the front cover plate 42 is corroded, it can still be attached to the inner wall of the water pressure chamber 2. The front cover plate 42 has a certain space for downward movement, which is the gap for the front cover plate 42 to move outward.

[0059] like Figure 9 As shown, blade 3 433 is located on the inward extension line of blade 2 421 and is in contact with the inner surface of blade 2 421.

[0060] Specifically, blade 3 433 serves as a connection and support, but it can also drive the liquid, just like blade 1 412 and blade 2 421.

[0061] Both sides of blade 433 are set with cutting edges. The axis of the cutting edge of blade 433 coincides with the axis of the front cover plate 42. When blade 2 421 rotates, it forms a cutting action with blade 433.

[0062] like Figure 11 As shown, blade 1 412, blade 2 421 and blade 3 433 form a set of arc-shaped blades. They rotate synchronously, which is equivalent to a complete impeller. Compared with the impeller in the prior art, this impeller assembly 4 is almost the same as the traditional impeller, so the effect on the liquid is also almost the same.

[0063] The working principle of this invention: The main body 1 is a submersible pump. The internal output shaft 3 rotates, controlling the rotation of the impeller assembly 4. The blades 412 and 421 in the impeller assembly 4 exert a pushing effect on the liquid, creating a high-pressure zone and a low-pressure zone, thus controlling the flow direction of the liquid. However, when there is a gap between the impeller assembly 4 and the pressure chamber 2, the liquid in the high-pressure zone flows to the low-pressure zone under the action of this gap, resulting in energy loss from the impeller assembly 4. Based on this problem, an improvement is proposed, as follows:

[0064] The impeller assembly 4 consists of two parts: a rear cover plate 41 and a front cover plate 42. The two parts have mating blades 412 and 421. Both blades 412 and 421 are components that generate thrust on the liquid, driving the liquid from the low-pressure area to the high-pressure area, thus enabling the submersible pump to work. The support part 43 limits the front cover plate 42. With the fastening layer 432 of the support part 43 cooperating with the front cover plate 42, the rear cover plate 41 and the front cover plate 42 are controlled to rotate synchronously.

[0065] The annular frame 431 and the fastening layer 432 are flush with the outer surface of the front cover plate 42. The thickness of the annular frame 431 and the fastening layer 432 is less than the thickness of the front cover plate 42. When the front cover plate 42 makes local reciprocating movements along the axis, it ensures that the annular frame 431 and the fastening layer 432 fit with the inlet 423 and the fastening groove 424 of the front cover plate 42. In addition, under the support of the elastic support part 44, the front cover plate 42 tends to move outward. The outer side of the front cover plate 42 rubs against the inner wall of the water pressure chamber 2, closing the gap between the impeller assembly 4 and the water pressure chamber 2. However, under the impact of external liquid particles and its own friction, wear can easily occur between the front cover plate 42 and the inner wall of the water pressure chamber 2. The gap caused by the wear will lead to leakage of high-pressure liquid to the low-pressure area. Based on this, the impeller assembly 4 is opened by the elastic support part 44 to avoid the formation of gaps. It should be noted that the gap is tiny, so even if the gap causes deformation of the impeller assembly 4, the deformation is minimal and will not cause other problems with the submersible pump.

[0066] Furthermore, the elastic support 44 has limited elasticity. When the first blade 412 and the second blade 421 drive the liquid, the liquid moves outward, resulting in a reaction force. The driven liquid also pushes the first blade 412 and the second blade 421, and also exerts a pushing effect on the rear cover plate 41 and the front cover plate 42. The rear cover plate 41 and the front cover plate 42 have an expansion tendency. Under this force, even though the elastic support 44 has limited effect, it keeps the gap between the front cover plate 42 and the pressure chamber 2 closed. The liquid thrust is a flexible thrust and will not push the front cover plate 42 to achieve hard compression. Therefore, even if the front cover plate 42 comes into contact with the pressure chamber 2, it will not cause the front cover plate 42 to get stuck or generate huge friction.

[0067] The stepped distribution of blades 412 and 421 easily leads to the accumulation of strip-shaped impurities. When the submersible pump is not in operation, the front cover 42 can be pushed upwards, causing the retaining groove 424 to disengage from the retaining layer 432. The retaining groove 424 moves upwards while the retaining layer 432 remains stationary. The steps formed by blades 412 and 421 become progressively smaller until they completely overlap. Figure 12 As shown, the front cover plate 42 is then rotated independently. The two sides of the second blade 421 cut against the first blade 412 and the third blade 433 respectively, clearing away any stuck strip-shaped impurities and preventing them from affecting the impeller rotation. In addition, even if impurities are caught on the elastic support part 44, the extended parts of the impurities are easily cut off by the two sides of the second blade 421, and the caught impurities are easily dropped outwards.

[0068] It should be noted that, in this document, relational terms such as "first" and "second" are used only to distinguish one entity or operation from another, and do not necessarily require or imply any such actual relationship or order between these entities or operations. Furthermore, the terms "comprising," "including," or any other variations thereof are intended to cover non-exclusive inclusion, such that a process, method, article, or apparatus that comprises a list of elements includes not only those elements but also other elements not expressly listed, or elements inherent to such process, method, article, or apparatus.

[0069] Finally, it should be noted that the above descriptions are merely preferred embodiments of the present invention and are not intended to limit the present invention. Although the present invention has been described in detail with reference to the foregoing embodiments, those skilled in the art can still modify the technical solutions described in the foregoing embodiments or make equivalent substitutions for some of the technical features. Any modifications, equivalent substitutions, improvements, etc., made within the spirit and principles of the present invention should be included within the protection scope of the present invention.

Claims

1. An adjustable axial clearance assembly structure for a permanent magnet submersible pump impeller, comprising a main body (1) and a pressure chamber (2) fixed to the main body (1), wherein the main body (1) has an output shaft (3), and an impeller assembly (4) located in the pressure chamber (2) is installed at the output end of the output shaft (3), characterized in that, Impeller assembly (4) includes: The rear cover plate (41) is in contact with the inner wall of the water pressure chamber (2) on one side, the outer side is connected to the output shaft (3), and the inner side has a blade (412). The front cover plate (42) contacts the inner wall of the other side of the water pressure chamber (2), and the inner side has blade two (421), which slides with blade one (412) to form blades for impeller rotation; The support (43) is fixed to the inner side of the rear cover plate (41) and extends through the front cover plate (42) to support the front cover plate (42). There is a gap between the front cover plate (42) and the support (43). After the front cover plate (42) is eroded by particles, it remains in contact with the inner wall of the other side of the water pressure chamber (2). The outer end face of the blade two (421) is provided with an elastic support part (44), which is supported by the rear cover plate (41) and is used to push the blade two (421) and the front cover plate (42) away from each other, so that the front cover plate (42) contacts the inner wall of the other side of the water pressure chamber (2). The elastic support part (44) includes a support shaft (441) and a support spring (442). The outer end face of the blade (421) is provided with a support cavity (443) extending along the axis of the front cover plate (42). The support spring (442) is located in the support cavity (443), and its outer end is fixed to the support shaft (441). One end of the support shaft (441) and the support spring (442) are fixed to each other and extend into the support cavity (443). The other end is attached to the rear cover plate (41).

2. The adjustable axial clearance assembly structure of the permanent magnet submersible pump impeller according to claim 1, characterized in that: The output shaft (3) extends from the main body (1) into the water pressure chamber (2). The end of the output shaft (3) has a snap-on edge (31), and the outer side of the rear cover plate (41) has a snap-on edge (411) that cooperates with the snap-on edge (31). The output shaft (3) and the rear cover plate (41) are fixed together by bolts.

3. The adjustable axial clearance assembly structure of the permanent magnet submersible pump impeller according to claim 1, characterized in that: Both blade one (412) and blade two (421) extend in an arc shape, and are located on the same arc-shaped extension path and in contact with each other. Blade one (412) and blade two (421) are distributed at different heights.

4. The adjustable axial clearance assembly structure of the permanent magnet submersible pump impeller according to claim 1, characterized in that: The sides of blade one (412) and blade two (421) are both set with cutting edges, and the axis of the cutting edge of both coincides with the axis of the rear cover plate (41) and the front cover plate (42). When one set of blade one (412) and blade two (421) is fixed and the other set rotates, a cutting action is formed.

5. The adjustable axial clearance assembly structure of the permanent magnet submersible pump impeller according to claim 1, characterized in that: The support part (43) includes a ring frame (431), a fastening layer (432) and a blade three (433). The blade three (433) is fixed between the ring frame (431) and the rear cover plate (41) for connecting the ring frame (431) and the rear cover plate (41). The fastening layer (432) is integrally formed on the outside of the ring frame (431). An inlet (423) runs through the axis of the front cover plate (42). The inlet (423) is matched with the liquid entry position of the water pressure chamber (2). The inner wall of the inlet (423) has an outwardly extending groove (424). The ring frame (431) and the buckle layer (432) are respectively embedded in the inlet (423) and the groove (424).

6. The adjustable axial clearance assembly structure of the permanent magnet submersible pump impeller according to claim 5, characterized in that: The ring frame (431) and the buckle layer (432) are flush with the outer side of the front cover plate (42), and the thickness of the ring frame (431) and the buckle layer (432) is less than the thickness of the front cover plate (42). The inner side of the front cover plate (42) is fixed with a thick layer (422) for covering the buckle groove (424), and the thick layer (422) is integrally formed with the blade (421).

7. The adjustable axial clearance assembly structure of the permanent magnet submersible pump impeller according to claim 5, characterized in that: The third blade (433) is located on the inward extension line of the second blade (421) and is in contact with the inner surface of the second blade (421).

8. The adjustable axial clearance assembly structure of the permanent magnet submersible pump impeller according to claim 5, characterized in that: Both sides of the blade three (433) are set with cutting edges. The axis of the cutting edge of the blade three (433) coincides with the axis of the front cover plate (42). When the blade two (421) rotates, it forms a cutting action with the blade three (433).

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