Permanent magnet submersible pump impeller axial clearance adjustable assembly structure

Abstract

The invention relates to the technical field of submersible pumps, and discloses a permanent magnet submersible pump impeller axial clearance adjustable assembling structure which comprises a main body and a water pressing cavity fixed to the main body, an output shaft is arranged in the main body, and an impeller assembly located in the water pressing cavity is installed at the output end of the output shaft. The outer side surface is connected with the output shaft, and the inner side surface is provided with blades I; the front cover plate makes contact with the inner wall of the other side of the water pressing cavity, and the inner side face is provided with a second blade and a blade in sliding fit with the first blade to form impeller rotation. The supporting part is fixed to the inner side of the rear cover plate and extends to penetrate through the front cover plate to support the front cover plate, and a gap is formed between the front cover plate and the supporting part. The front cover plate is always tightly attached to the inner wall of the water pressing cavity under the action of the elastic supporting part and the hydraulic counter-acting force. Even if the sealing ring is eroded and abraded by solid particles, the sealing ring can automatically move forwards to fill the gap, and the problem of leakage caused by gap enlargement after a traditional sealing ring is abraded is thoroughly solved.

Description

Technical Field

[0001] The invention relates to the technical field of submersible pumps, in particular to an assembly structure with adjustable axial clearance of a permanent magnet submersible pump impeller. Background Art

[0002] When a submersible pump is operating, the impeller suction port is a low-pressure area, while the impeller pressure chamber is a high-pressure area. The impeller connects these two different pressure areas, and the rotation of the impeller drives the liquid to 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 considerable amount of the high-pressure liquid that has been driven and discharged by the impeller and has gained energy will leak directly back into the impeller suction port through this gap. This leaked liquid completely loses energy and does not contribute to the effective head and flow rate of the submersible pump, wasting the motor's input power and reducing the pump's volumetric efficiency. To achieve this, it is necessary to adjust this gap to a reasonable minimum value while avoiding friction, thereby minimizing internal circulation leakage of high-pressure liquid into the low-pressure area and improving the pump's volumetric efficiency and overall efficiency.

[0003] However, when the submersible pump is running and there are certain particles in the transported liquid, the particles gain kinetic energy under the high-speed rotation drive of the impeller and produce a "sandpaper" effect, which continuously rubs the impeller, causing the material to be gradually worn away, and the gap between the impeller and the pump cover inlet side is gradually eroded, causing the gap to increase. Then, 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 no longer contribute to the effective flow and head of the pump. Summary of the Invention

[0004] The object of the present invention is to provide an assembly structure with adjustable axial clearance of a permanent magnetic submersible pump impeller, so as to solve the problems raised in the above-mentioned background technology.

[0005] In order to solve the above technical problems, the present invention provides the following technical solutions: a permanent magnet submersible pump impeller axial clearance adjustable assembly structure, comprising a main body and a water pressure chamber fixed to the main body, an output shaft is provided in the main body, and an impeller assembly located in the water pressure chamber is installed at the output end of the output shaft, the impeller assembly comprising:

[0006] The rear cover plate contacts the inner wall of one side of the water pressure chamber, the outer side of the cover plate is connected to the output shaft, and the inner side of the cover plate has a blade 1;

[0007] The front cover plate contacts the inner wall of the other side of the water pressure chamber, and has a second blade on the inner side thereof, which is slidably matched with the first blade to form a blade for rotating the impeller;

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

[0009] Furthermore, the output shaft extends from the main body into the water pressure chamber, the end of the output shaft has a buckle edge 1, the outer side of the rear cover plate has a buckle edge 2 that matches the buckle edge 1, and the output shaft and the rear cover plate are fixed by bolts.

[0010] Furthermore, the blade 1 and the blade 2 both extend in an arc shape, are located on the same arc extension path and are in contact with each other, and the blade 1 and the blade 2 are distributed at different heights.

[0011] Furthermore, the side edges of blade one and blade two are both provided with cutting edges, and the axes of the cutting edges of both coincide with the axes of the rear cover plate and the front cover plate. When one group of blade one and blade two is fixed and the other group rotates, a cutting effect is formed.

[0012] Furthermore, the outer end surface of the blade 2 is provided with an elastic support portion with elasticity, which is supported by the rear cover plate and is used to push the blade 2 and the front cover plate away from each other, so that the front cover plate contacts the inner wall on 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 surface of blade 2 is provided with a support cavity extending along the axis direction of the front cover plate. The support spring is located in the support cavity, and the outer end is fixed to the support shaft. One end of the support shaft fixed to the support spring extends into the support cavity, and the other end is in contact with the rear cover plate.

[0014] Furthermore, the support portion includes an annular frame, a buckle layer and a third blade, wherein the third blade is fixed between the annular frame and the rear cover plate to connect the annular frame and the rear cover plate, and the buckle layer is integrally formed on the outer side of the annular frame;

[0015] An inlet is passed through the axis of the front cover, which matches the liquid entry position of the water pressure chamber. The inner wall of the inlet has a buckle groove extending outward, and the annular frame and the buckle layer are respectively embedded in the inlet and the buckle groove.

[0016] Furthermore, the annular frame and the buckle layer are flush with the outer side surface of the front cover plate, and the thickness of the annular frame and the buckle layer are both less than the thickness of the front cover plate;

[0017] A thick layer for covering the buckle groove is fixed on the inner side surface of the front cover plate, and the thick layer is integrally formed with the blade 2.

[0018] Furthermore, the blade three is located on the inward extension line of the blade two and fits in with the inner side surface of the blade two.

[0019] Furthermore, both side surfaces of the blade three are arranged as blade surfaces, and the axis of the blade three edge surface coincides with the axis of the front cover plate. When the blade two rotates, a cutting effect is formed between the blade two and the blade three.

[0020] Compared with the prior art, the present invention has the following beneficial effects:

[0021] 1. The front cover always adheres closely to the inner wall of the water pressure chamber under the action of the elastic support and hydraulic reaction force. Even if it is eroded by solid particles, it can automatically move forward to fill the gap, completely solving the problem of leakage caused by the gap expansion after the traditional sealing ring is worn.

[0022] 2. The support spring continuously provides outward thrust to ensure that the front cover is still in contact with the cavity wall when the machine is stopped. When the impeller rotates, the reaction force of the liquid pushes the front cover to expand outward, forming a flexible seal to avoid hard friction and stagnation.

[0023] 3. Since the front cover needs to be supported outward, blades 1, 2 and 3 are additionally designed with cutting edge structures to cut entangled strip impurities during relative movement to prevent blockage. BRIEF DESCRIPTION OF THE DRAWINGS

[0024] The accompanying drawings are used to provide a further understanding of the present invention and constitute a part of the specification. Together with the embodiments of the present invention, they are used to explain the present invention and do not constitute a limitation of the present invention. In the accompanying drawings:

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

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

[0027] Figure 3 This is a schematic diagram of the exploded structure of the impeller assembly and the output shaft of the present invention;

[0028] Figure 4 It is a schematic diagram of the exploded structure of the impeller assembly of the present invention;

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

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

[0031] Figure 7 This invention Figure 6 A schematic diagram of the partially enlarged structure of the middle part;

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

[0033] Figure 9 It is a schematic diagram of a longitudinal partial cross-sectional structure of an 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 It is a schematic diagram of the structure in which the rear cover plate and the front cover plate are close to each other.

[0037] In the figure: 1. Main body; 2. Water pressure chamber; 3. Output shaft; 31. Buckle edge 1; 4. Impeller assembly; 41. Rear cover; 411. Buckle edge 2; 412. Blade 1; 42. Front cover; 421. Blade 2; 422. Thick layer; 423. Inlet; 424. Buckle groove; 43. Support part; 431. Ring frame; 432. Buckle layer; 433. Blade 3; 44. Elastic support part; 441. Support shaft; 442. Support spring; 443. Support cavity hole. DETAILED DESCRIPTION

[0038] The following will clearly and completely describe the technical solutions in the embodiments of the present invention in conjunction with the accompanying drawings. Obviously, the described embodiments are only part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without making creative efforts are within the scope of protection of the present invention.

[0039] See also Figures 1-12 The present invention provides a technical solution: the impellers of submersible pumps are not exactly the same. Different impellers can be set according to different usage environments or situations. At present, the suction port of the submersible pump is a low-pressure area, while the periphery of the water pressure chamber 2 is a high-pressure area. There is a very small gap between the position of the impeller close to the low-pressure area and the water pressure chamber 2, usually at the level of 0.1-0.5 mm. The current existing technology generally provides a sealing ring or a mouth ring in this gap area to reduce leakage. Based on this problem, a permanent magnet submersible pump impeller axial gap adjustable assembly structure is proposed, such as Figures 1-4 As shown, it includes a main body 1 and a water pressure chamber 2 fixed to the main body 1. The main body 1 has an output shaft 3. The output end of the output shaft 3 is installed with an impeller assembly 4 located in the water pressure chamber 2. The impeller assembly 4 includes:

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

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

[0042] The support portion 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 portion 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.

[0043] Specifically, the main body 1 is a submersible pump, which has a pressure water chamber 2, and the output shaft 3 is a rotating shaft for driving the impeller assembly 4 to rotate, wherein the impeller assembly 4 is divided into a rear cover plate 41, a front cover plate 42 and a support portion 43. The rear cover plate 41 is fixed to the support portion 43, and the front cover plate 42 is slidably arranged on the support portion 43. The position of the front cover plate 42 can be adjusted so that the front cover plate 42 fits the inner wall of the pressure water chamber 2 and isolates the gap as much as possible. It should be noted that although there are sealing rings or mouth rings in the prior art to reduce leakage, they are easily eroded by particles in the high-speed moving liquid, which will still cause the gap to continue to increase during use, and the impact will only become greater and greater, and the effect of reducing leakage cannot be maintained. Even if the front cover plate 42 is eroded, it still fits relative to the inner wall of the pressure water chamber 2 to achieve a stable effect. It should also be noted that when the impeller assembly 4 is operating, the liquid is driven into the high-pressure area. This driven liquid exerts a reaction force on the impeller assembly 4, causing the liquid to reversely support the impeller assembly 4, ensuring that the front cover 42 is in contact with the inner wall of the water pressure chamber 2. The liquid-driven force is a flexible effect and does not cause the impeller assembly 4 to have difficulty rotating. Furthermore, even if the front cover 42 is eroded, the liquid reaction force remains constant, ensuring that the front cover 42 is in contact with the inner wall of the water pressure chamber 2.

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

[0045] Specifically, the output shaft 3 is first fastened to the rear cover plate 41 through the first buckle edge 31 and the second buckle 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, the blade 1 412 and the blade 2 421 both extend in an arc shape, are located on the same arc extension path and are in contact with each other, and the blade 1 412 and the blade 2 421 are distributed in high and low positions.

[0047] Specifically, blade one 412 and blade two 421 are both used to drive the liquid. Blade one 412 and blade two 421 are distributed in an up-down manner. In order to distinguish them clearly, the span of blade one 412 and blade two 421 in the accompanying drawings is increased to show them more clearly. In actual use, the step surfaces of blade one 412 and blade two 421 can be set to a fine gap shape, which is adjusted according to the space inside the water pressure chamber 2, so that the liquid drive of blade one 412 and blade two 421 is almost the same as the ordinary blade drive. The up-down height distribution allows the front cover plate 42 to move locally outward to reduce the gap between it and the water pressure chamber 2 as much as possible.

[0048] like Figure 5 and Figure 8 As shown, the side edges of blade 1 412 and blade 2 421 are both set as cutting edges, and the axes of the cutting edges of both coincide with the axes of the rear cover 41 and the front cover 42. When one group of blade 1 412 and blade 2 421 is fixed and the other group rotates, a cutting effect is formed.

[0049] Specifically, the edge portions of blade one 412 and blade two 421 are both blade surfaces, where one of blade one 412 and blade two 421 is stationary while the other rotates, thereby producing a cutting effect, and the remaining impurities are easily chopped, thereby processing the impurities and reducing the amount remaining inside the impeller assembly 4.

[0050] like Figure 6-Figure 7 As shown, the outer end surface of the second blade 421 is provided with an elastic support portion 44 with elasticity, and the elastic support portion 44 is supported by the rear cover plate 41 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 surface of the blade 2 421 is provided with a support cavity 443 extending along the axial direction of the front cover plate 42. The support spring 442 is located in the support cavity 443, and the outer end is fixed to the support shaft 441. One end of the support shaft 441 fixed to the support spring 442 extends into the support cavity 443, and the other end is in contact with the rear cover plate 41.

[0052] Specifically, the front cover plate 42 and the blade 2 421 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 keep the front cover plate 42 in coordination with the support portion 43.

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

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

[0055] Specifically, the support portion 43 includes an annular frame 431, a buckle layer 432 and a blade three 433, wherein the annular frame 431 and the buckle layer 432 are integrated, and the blade three 433 is used to fix the annular frame 431 to the rear cover plate 41, and the annular frame 431 and the buckle layer 432 respectively cooperate with the entrance 423 and the buckle groove 424 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 annular frame 431 and the buckle layer 432 are flush with the outer side of the front cover plate 42, and the thickness of the annular frame 431 and the buckle layer 432 are both less than the thickness of the front cover plate 42;

[0057] A thick layer 422 for covering the buckle groove 424 is fixed to the inner side surface of the front cover plate 42 , and the thick layer 422 is integrally formed with the second blade 421 .

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

[0059] like Figure 9 As shown, the blade three 433 is located on the inward extension line of the blade two 421 and fits in with the inner side surface of the blade two 421 .

[0060] Specifically, blade three 433 serves a connecting and supporting function, but can also drive the liquid, just like blade one 412 and blade two 421 .

[0061] Both sides of the blade three 433 are arranged with blade surfaces, and the axis of the blade surface of the blade three 433 coincides with the axis of the front cover 42 . When the blade two 421 rotates, a cutting effect is formed between the blade three 433 and the blade three 433 .

[0062] like Figure 11 As shown, blade one 412, blade two 421 and blade three 433 form a group of arc-shaped blades, which rotate synchronously when rotating, equivalent to a complete impeller. Compared with the impeller in the prior art, the impeller assembly 4 is almost the same as the traditional impeller, so the effect on the liquid is also almost the same.

[0063] The present invention operates as follows: Main body 1 is a submersible pump. The internal output shaft 3 rotates, controlling the rotation of impeller assembly 4. Blades 1 412 and 2 421 in impeller assembly 4 push against the liquid, creating high-pressure and low-pressure zones, controlling the direction of liquid flow. However, when there is a gap between impeller assembly 4 and pressure chamber 2, liquid in the high-pressure zone flows toward the low-pressure zone due to this gap, resulting in energy loss from the impeller assembly 4. To address this issue, improvements are proposed, specifically as follows:

[0064] The impeller assembly 4 consists of two parts: a rear cover plate 41 and a front cover plate 42, with a matching blade 1 412 and a blade 2 421 between the two. Blade 1 412 and blade 2 421 are components that generate thrust on the liquid, driving the liquid from the low-pressure area to the high-pressure area, so as to realize the operation of the submersible pump. The support part 43 limits the front cover plate 42. Under the cooperation of the buckle layer 432 of the support part 43 and 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 buckle layer 432 are flush with the outer side surface of the front cover plate 42, and the thickness of the annular frame 431 and the buckle layer 432 are both less than the thickness of the front cover plate 42, so that when the front cover plate 42 performs local reciprocating motion along the axis, the annular frame 431 and the buckle layer 432 are ensured to cooperate with the inlet 423 and the buckle 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, and the outer side of the front cover plate 42 and the inner wall of the water pressure chamber 2 generate friction, closing the gap between the impeller assembly 4 and the water pressure chamber 2. However, under the impact of external liquid particles and the friction of the impeller assembly 4, wear and tear can easily occur between the front cover plate 42 and the inner wall of the water pressure chamber 2. The gap caused by wear will cause 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 the impeller assembly 4 to deform, the deformation is slight and will not cause other problems of the submersible pump.

[0066] In addition, the elastic effect of the elastic support part 44 is limited. When the blade 1 412 and the blade 2 421 drive the liquid, the liquid moves outward, and there is a reaction force of the liquid. The driven liquid also pushes the blade 1 412 and the blade 2 421. In addition, there is 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 a tendency to expand. Under this force, even if the elastic support part 44 has limited effect, the gap between the front cover plate 42 and the water pressure chamber 2 is kept closed. The liquid thrust is a flexible thrust and will not push the front cover plate 42 to achieve hard extrusion. Therefore, even if there is contact between the front cover plate 42 and the water pressure chamber 2, it will not cause the front cover plate 42 to be stuck or produce huge friction.

[0067] The stepped distribution of blade 1 412 and blade 2 421 can easily cause strip-shaped impurities to hang on them. When the submersible pump is not working, the front cover 42 can be pushed upward to disengage the buckle groove 424 from the buckle layer 432, and the buckle groove 424 moves upward, while the buckle layer 432 remains stationary. The steps formed by blade 1 412 and blade 2 421 become smaller and smaller until they are completely overlapped. Figure 12 As shown, the front cover 42 is then rotated. The front cover 42 rotates independently, and the two side surfaces of the second blade 421 respectively cut with the first blade 412 and the third blade 433, thereby clearing the trapped strips of impurities and preventing them from affecting the rotation of the impeller. Furthermore, even if impurities are caught on the elastic support 44, the extended portion of the impurity is easily cut off by the two sides of the second blade 421, and the hanging impurities are easily dropped outward.

[0068] It should be noted that, in this document, relational terms such as first and second, etc., are used only to distinguish one entity or operation from another entity or operation, and do not necessarily require or imply any actual relationship or order between these entities or operations. Moreover, the terms "comprises," "comprising," or any other variations thereof are intended to cover non-exclusive inclusion, such that a process, method, article, or apparatus that includes a list of elements includes not only those elements but also other elements not explicitly 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 aforementioned embodiments, those skilled in the art will be able to modify the technical solutions described in the aforementioned embodiments or substitute equivalents for some of the technical features. Any modifications, equivalent substitutions, and improvements made within the spirit and principles of the present invention shall be included within the scope of protection of the present invention.

Claims

1. A permanent magnet submersible pump impeller axial clearance adjustable assembly structure, comprising a main body (1) and a water pressure chamber (2) fixed to the main body (1), an output shaft (3) being provided in the main body (1), an impeller assembly (4) located in the water pressure chamber (2) being installed at the output end of the output shaft (3), characterized in that: The impeller assembly (4) comprises: A rear cover plate (41) contacts an inner wall of one side of the water pressure chamber (2), an outer side surface is connected to the output shaft (3), and an inner side surface has a blade 1 (412); The front cover plate (42) contacts the inner wall of the other side of the water pressure chamber (2), and has a second blade (421) on the inner side surface, which is slidably matched with the first blade (412) to form a blade for rotating the impeller; The support portion (43) is fixed to the inner side of the rear cover plate (41), extends through the front cover plate (42), and supports the front cover plate (42). A gap is provided between the front cover plate (42) and the support portion (43), and 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.

2. The permanent magnet submersible pump impeller axial clearance adjustable assembly structure according to claim 1 is 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 buckle edge 1 (31), the outer side surface of the rear cover plate (41) has a buckle edge 2 (411) that matches the buckle edge 1 (31), and the output shaft (3) and the rear cover plate (41) are fixed by bolts.

3. The permanent magnet submersible pump impeller axial clearance adjustable assembly structure according to claim 1 is characterized in that: The blade one (412) and the blade two (421) are both extended in an arc shape, and both are located on the same arc extension path and are in contact with each other. The blade one (412) and the blade two (421) are distributed in high and low positions.

4. The permanent magnet submersible pump impeller axial clearance adjustable assembly structure according to claim 1 is characterized in that: The side edges of the blade 1 (412) and the blade 2 (421) are both provided with cutting edges, and the axes of the cutting edges of both coincide with the axes of the rear cover plate (41) and the front cover plate (42). When one group of blade 1 (412) and blade 2 (421) is fixed and the other group rotates, a cutting effect is formed.

5. The permanent magnet submersible pump impeller axial clearance adjustable assembly structure according to claim 1 is characterized in that: The outer end surface of the second blade (421) is provided with an elastic support portion (44) having elasticity, and the elastic support portion (44) is supported by 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).

6. The permanent magnet submersible pump impeller axial clearance adjustable assembly structure according to claim 5, characterized in that: The elastic support portion (44) includes a support shaft (441) and a support spring (442). The outer end surface of the second blade (421) is provided with a support cavity (443) extending along the axis direction of the front cover (42). The support spring (442) is located in the support cavity (443) and the outer end is fixed to the support shaft (441). One end of the support shaft (441) fixed to the support spring (442) extends into the support cavity (443), and the other end is in contact with the rear cover (41).

7. The permanent magnet submersible pump impeller axial clearance adjustable assembly structure according to claim 1 is characterized in that: The support portion (43) includes an annular frame (431), a buckle layer (432) and a blade three (433). The blade three (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 buckle layer (432) is integrally formed on the outer side of the annular frame (431). An inlet (423) is passed through the axis of the front cover (42), and the inlet (423) cooperates with the liquid entry position of the water pressure chamber (2). The inner wall of the inlet (423) has a buckle groove (424) extending outward, and the annular frame (431) and the buckle layer (432) are respectively embedded in the inlet (423) and the buckle groove (424).

8. The permanent magnet submersible pump impeller axial clearance adjustable assembly structure according to claim 7, characterized in that: The annular frame (431) and the buckle layer (432) are flush with the outer side surface of the front cover plate (42), and the thickness of the annular frame (431) and the buckle layer (432) are both less than the thickness of the front cover plate (42); A thick layer (422) for shielding the buckle groove (424) is fixed on the inner side of the front cover plate (42), and the thick layer (422) and the blade 2 (421) are integrally formed.

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

10. The permanent magnet submersible pump impeller axial clearance adjustable assembly structure according to claim 7, characterized in that: Both sides of the blade three (433) are provided with blade surfaces, and the axis of the blade surface of the blade three (433) coincides with the axis of the front cover plate (42). When the blade two (421) rotates, a cutting effect is formed between the blade three (433).

Images