Water inlet structure of filter screen type permanent magnet submersible pump

Abstract

The invention relates to the technical field of submersible pumps, and discloses a filter screen type permanent magnet submersible pump water inlet structure which comprises a main body and a water inlet part at the output end of the main body, the water inlet part comprises a first end cover and a second end cover, the upper axis and the lower axis of the first end cover coincide, and a supporting frame is installed between the first end cover and the second end cover; the upper end and the lower end of the filter layer are respectively clamped with the end cover I and the end cover II, the filter layer is formed by mutually connecting a plurality of sections of foldable parts to form a ring shape, and when one group of foldable parts is in a folded state and one folding part is folded, the other parts are stretched to be in a fixed state, and particles at the folded parts are extruded outwards. The first sheet layer and the second sheet layer are mutually extruded and attached, the filter holes of the first sheet layer and the second sheet layer are staggered, the filter holes form extrusion force from inside to outside, clamped particles are pushed out of the filter holes, the particles are prevented from entering a pump body, the filter holes are prevented from being forcibly extruded and expanded, the particles are prevented from entering the pump body to damage an impeller, and the service life of the submersible pump is prolonged; the inner ends of the folded filter holes are blocked, so that manual cleaning is facilitated.

Description

Technical Field

[0001] The invention relates to the technical field of submersible pumps, in particular to a filter-type permanent magnet submersible pump water inlet structure. Background Art

[0002] A filter is usually required to be installed at the water inlet of a submersible pump. The role of the filter is crucial. Its main function is to protect the impeller and internal structure and filter out impurities.

[0003] Submersible pumps operate in an environment where particulate matter is present, especially when pumping water from the bottom of a well, riverbed, or pond. The filter acts as a barrier, preventing these particles from being drawn into the pump. Particles smaller than the filter can enter the pump, causing some wear, but this wear is not acute and does not pose a significant threat to the pump in the short term. Larger particles, however, can cause sudden damage to the pump, impacting the high-speed rotating impeller blades, potentially breaking, deforming, and disrupting their balance. Therefore, large particles need to be blocked by the filter. However, particle size varies, ranging from large to small. This can clog the filter, leading to a sudden drop in flow and overheating and burnout of the motor due to idling.

[0004] Based on this, when particles that are relatively similar to the filter holes are stuck on the filter, they need to be cleaned regularly. However, for the sake of convenience and speed, the particles stuck in the filter holes are often pushed inward during cleaning, so that the particles move into the submersible pump. The particles pushed inward cannot be poured out from the holes of the filter due to their size. The particles pushed inward will damage the running impeller blades, especially when the amount of particles pushed inward is relatively large. Based on this, it is proposed to improve the water inlet structure. Summary of the Invention

[0005] The object of the present invention is to provide a filter-type permanent magnet submersible pump water inlet structure to solve the problems raised in the above background technology.

[0006] In order to solve the above technical problems, the present invention provides the following technical solutions: a water inlet structure of a filter-type permanent magnet submersible pump, comprising a main body and a water inlet component at the output end of the main body, the water inlet component comprising:

[0007] End cover 1 and end cover 2 have their upper and lower axes coincident, and a support frame is installed between the two;

[0008] The filter layer is clamped with end cap 1 and end cap 2 at the upper and lower ends respectively. The filter layer is composed of multiple foldable parts connected to each other to form a ring shape. By default, one group is in a folded state. When one folded part is folded, the other parts are stretched into a fixed state, squeezing the particles at the fold outward.

[0009] Furthermore, the upper end of the support frame is fixed to the end cover 1, and the lower end is fixed to the end cover 2, so as to fix the positions of the end cover 1 and the end cover 2, and the upper end of the end cover 1 is fixed to the main body;

[0010] A support ring with an axis coincident with the end cover is fixed inside the second end cover, and the outer side of the support ring is tangent to the filter layer in a stretched state.

[0011] Furthermore, the filter layer includes a plurality of shafts and a plurality of groups of foldable sheets;

[0012] A circular groove 1 is formed at the lower end of the end cover, and a circular groove 2 is formed at the upper end of the end cover. Blocks extending into the circular groove 1 and the circular groove 2 are fixed to the upper and lower ends of the multiple shafts respectively. The foldable sheets are connected between two adjacent shafts, and the multiple groups of foldable sheets are distributed in a circle at intervals with the multiple shafts, and one group of foldable sheets is in a folded shape.

[0013] Furthermore, the axes of the circular groove 1 and the circular groove 2 coincide with each other and are the same in size, depth and shallowness. The inner and outer side surfaces of the block at the end of the shaft rod are both arc-shaped, which fits with the circular groove 1 and the circular groove 2.

[0014] Furthermore, the block at the end of the shaft rod is made of metal, and its surface is smooth, and the inner walls of the circular groove 1 and the circular groove 2 are also smooth.

[0015] Furthermore, the foldable sheet includes a sheet layer 1 and a sheet layer 2, the sheet layer 1 and the sheet layer 2 are hinged to each other, and the outer sides of the sheet layer 1 and the sheet layer 2 are hinged to the shafts on both sides respectively.

[0016] Furthermore, both the sheet layer 1 and the sheet layer 2 have filter holes for filtering. When the sheet layer 1 and the sheet layer 2 are folded, they fit together and the filter holes on the sheet layer 1 and the sheet layer 2 are staggered. When unfolded, they form a straight line.

[0017] Furthermore, the sheet layer 1 and the sheet layer 2 are both vertical metal sheets, and their upper and lower side surfaces are in contact with the end cover 1 and the end cover 2 respectively.

[0018] Furthermore, the sides of the layer one and the layer two that are close to each other have a longitudinally extending connecting cavity, and the sides of the layer one and the layer two that are close to each other are arc surfaces that fit together, and the axis of the connecting cavity coincides with the axis of the arc surface. A double-axis frame is inserted into the connecting cavity of the layer one and the layer two for connecting the layer one and the layer two.

[0019] Furthermore, connecting shafts parallel to the axis of the shaft are fixed on both sides of the shaft rod, and the side where layer one and layer two are away from each other is also an arc surface, and the arc surfaces are respectively fitted with the shaft rods on both sides. The connecting shafts relative to the shaft rods on both sides respectively penetrate layer one and layer two longitudinally, and respectively coincide with the axis of the arc surface on the side where layer one and layer two are away from each other.

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

[0021] 1. Multiple groups of foldable sheets are connected in a ring shape through shafts. One group is in a folded state by default. When the adjacent shafts are manually pinched, the target foldable sheet folds and the remaining foldable sheets automatically unfold to keep the filtration area constant. The foldable sheets can only be folded outward. When folded, sheet layer 1 and sheet layer 2 are squeezed and fitted against each other. The filter holes of the two are misaligned, and the filter holes form an extrusion force from the inside to the outside, pushing the stuck particles out of the filter holes to prevent them from entering the pump body and forcibly squeezing and expanding the filter holes, thus preventing them from entering the pump body and damaging the impeller, thereby extending the life of the submersible pump. Even if the particles are not completely squeezed out, the inner end of the filter hole is blocked after folding for easy manual removal.

[0022] 2. Only one set of foldable sheets is folded at a time, and the rest of the sheets are maintained for water inlet filtration. No need to stop the machine, fold each set of foldable sheets in sequence to achieve comprehensive cleaning of the annular filter layer. Manually pinching the shaft can complete single-point cleaning without tools. The circular operation can cover the entire filter layer.

[0023] 3. The support ring resists the negative pressure of the water flow, ensuring that the filter can only fold outwards and maintain operational reliability. 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 It is a schematic structural diagram of the water inlet component of the present invention;

[0027] Figure 3 This is a schematic diagram of the explosion structure of the water inlet component of the present invention;

[0028] Figure 4 This is a structural diagram of an end cover of the present invention;

[0029] Figure 5 This is a schematic diagram of the second structure of the end cover of the present invention;

[0030] Figure 6 Schematic diagram of the filter layer structure of the present invention;

[0031] Figure 7 Schematic diagram of the filter layer structure from top view of the present invention;

[0032] Figure 8 It is a schematic diagram of the local structure of the filter layer of the present invention;

[0033] Figure 9It is a schematic diagram of the exploded structure of the foldable sheet of the present invention;

[0034] Figure 10 This is a schematic diagram of the structure of the filter layer of the present invention installed on the second end cover when viewed from above.

[0035] In the figure: 1. Main body; 2. Water inlet component; 21. End cover 1; 211. Circular groove 1; 22. End cover 2; 221. Circular groove 2; 23. Support frame; 24. Filter layer; 241. Shaft; 242. Foldable sheet; 243. Sheet layer 1; 244. Sheet layer 2; 245. Filter hole; 246. Connecting shaft; 247. Connecting hole cavity; 248. Double-axis frame; 3. Support ring. DETAILED DESCRIPTION

[0036] 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.

[0037] See also Figures 1-10 The present invention provides a technical solution: when cleaning particles stuck on the existing filter, the particles are generally squeezed inward directly to make them enter the submersible pump. However, since the particles are originally squeezed in, it is difficult to pour them out when dumping. At the same time, if the particles stuck on the filter are in a hard state, squeezing them into the interior will have a greater impact on the submersible pump. The hard particles also have the risk of enlarging the filter holes when squeezed inward, affecting the filtration of the filter and reducing the service life of the filter. Based on this, a filter-type permanent magnet submersible pump water inlet structure is proposed, such as Figure 1-Figure 3 As shown, it includes a main body 1 and a water inlet component 2 at the output end of the main body 1, and the water inlet component 2 includes:

[0038] End cover 1 21 and end cover 2 22 have their upper and lower axes coincident, with a support frame 23 installed between them;

[0039] The filter layer 24 is respectively secured at its upper and lower ends with the end cap 1 21 and the end cap 2 22. The filter layer 24 is formed into a ring shape by a plurality of foldable sections interconnected. One group is in a folded state by default. When one folded section is folded, the remaining sections are stretched into a fixed state, squeezing the particles at the folded section outward.

[0040] Specifically, the device comprises a main body 1 and a water inlet component 2 at the output end of the main body 1. The main body 1 is a submersible pump, such as an existing submersible pump used in water. The water inlet component 2 is a filter component used to filter particulate matter. The water inlet component 2 includes an upper and lower end cap 1 21 and an upper end cap 22. The upper end cap 1 21 is fixed to the submersible pump. A support frame 23 is fixed between the upper end cap 22 and the lower end cap 1 21. The support frame 23 actually supports the upper end cap 22, forming the water inlet component 2 into a solid cage. The outer side of the cage has a filter layer 24, which primarily filters the water entering the submersible pump. The filter layer 24 is in a ring shape and can be folded. Each folded part can be a foldable sheet 242. When the filter layer 24 is in the initial state, there is a group of folded foldable sheets 242, and the remaining foldable sheets 242 are in an unfolded state. When different groups of foldable sheets 242 are folded, the remaining foldable sheets 242 will all return to the unfolded state, ensuring sustainable filtration without affecting the smooth flow of water inlet at other locations.

[0041] like Figure 4-Figure 6 As shown, the upper end of the support frame 23 is fixed to the end cover 1 21, and the lower end is fixed to the end cover 22, which is used to fix the positions of the end cover 1 21 and the end cover 22, and the upper end of the end cover 1 21 is fixed to the main body 1;

[0042] A support ring 3 whose axis coincides with the end cover 22 is fixed inside the second end cover 22 , and the outer side of the support ring 3 is tangent to the filter layer 24 in a stretched state.

[0043] Specifically, the support frame 23 is in the shape of multiple shafts, which play a supporting role and fix the end cover 1 21 and the end cover 2 22. It should be noted that when a group of foldable sheets 242 are squeezed and folded, there are two directions of folding: inward and outward. When folding outward, the inner sides of the foldable sheets 242 are in contact with each other, so they need to be folded outward. The support ring 3 on the end cover 22 plays a blocking role, blocking the inner side of the unfolded foldable sheet 242, so that the foldable sheet 242 can only be folded outward when it is deformed. In addition, when the submersible pump is filled with water, it has a negative pressure effect, pushing the foldable sheets 242 from the outside inward, and the inner side of the foldable sheets 242 is blocked by the support ring 3, which can prevent all the foldable sheets 242 from producing local folding deformation inward, so that when a single group of foldable sheets 242 is folded, all the foldable sheets 242 need to be pulled. After each group of foldable sheets 242 produces local deformation inward, the single group of foldable sheets 242 is completely folded, and each group of foldable sheets 242 needs to be pulled to restore. Each group of foldable sheets 242 has friction, which increases the difficulty of operation.

[0044] The filter layer 24 includes a plurality of shafts 241 and a plurality of foldable sheets 242;

[0045] A circular groove 1 211 is formed at the lower end of the end cap 1 21 , and a circular groove 221 is formed at the upper end of the end cap 22 . Blocks extending into the circular groove 1 211 and the circular groove 221 are fixed to the upper and lower ends of the multiple shaft rods 241 , respectively. Foldable sheets 242 are connected between two adjacent shaft rods 241 , and multiple groups of foldable sheets 242 are distributed in a circumferential manner with the multiple shaft rods 241 , one group of foldable sheets 242 is in a folded shape.

[0046] Specifically, multiple shafts 241 have blocks at both ends, so that the blocks at both ends of the shafts 241 are respectively clamped in the upper and lower circular grooves 1 211 and 221, so that the shafts 241 remain in a vertical state and can slide along the circular grooves 1 211 and 221, and the foldable pieces 242 can be changed from unfolded to folded, and also from folded to unfolded.

[0047] like Figure 3-Figure 6 As shown, the axes of the first circular groove 211 and the second circular groove 221 coincide with each other and are of the same size, depth and shallowness. The inner and outer side surfaces of the block at the end of the shaft 241 are both arc-shaped, fitting with the first circular groove 211 and the second circular groove 221.

[0048] The shape of the block matches the circular groove 1 211 and the circular groove 2 221. Under the action of the block, the shaft 241 is limited so that it remains vertical even when it moves. It should be noted that the block needs to slide along the circular groove 1 211 or the circular groove 2 221. Therefore, the inner and outer side surfaces of the block are both arc-shaped and need to fit with the inner walls on both sides of the circular groove 1 211 or the circular groove 2 221. This can prevent the block from rotating and also allow it to slide along the circular groove 1 211 or the circular groove 2 221.

[0049] The block at the end of the shaft 241 is made of metal with a smooth surface. The inner walls of the first circular groove 211 and the second circular groove 221 are also smooth.

[0050] Specifically, the upper and lower blocks need to generate friction with the inner walls of the circular groove 1 211 and the circular groove 2 221 , and the metal material can greatly reduce the loss, and the smooth setting can also minimize the friction and extend the service life.

[0051] like Figure 8 As shown, the foldable sheet 242 includes a sheet layer 1 243 and a sheet layer 244 , which are hinged to each other. The outer sides of the sheet layer 1 243 and the sheet layer 2 244 are hinged to the shafts 241 on both sides respectively.

[0052] Specifically, when the shafts 241 on both sides approach each other, the middle layer 1 243 and the layer 2 244 are hinged on the outside and the positions where they are connected to each other are also hinged, so they can achieve the folding effect. The remaining foldable sheets 242 can only move along the circular groove 1 211 and the circular groove 2 221 because the shaft 241 is restricted by the circular groove 1 211 and the circular groove 2 221. Therefore, when one group of foldable sheets 242 is folded, the rest are stretched and in an unfolded state.

[0053] Both the first sheet 243 and the second sheet 244 have filter holes 245 for filtering. When folded, the first sheet 243 and the second sheet 244 fit together and the filter holes 245 on the first sheet 243 and the second sheet 244 are staggered. When unfolded, they form a straight line.

[0054] Specifically, both sheet 1 243 and sheet 2 244 have filter holes 245 of the same size. When sheets 1 243 and 2 244 are folded, the filter holes 245 of sheets 1 243 and 2 244 are positioned in a staggered pattern, so that sheet 1 243 blocks the filter holes 245 on sheet 2 244, and similarly, sheet 2 244 blocks the filter holes 245 on sheet 1 243, resulting in a disconnected connection between the inside and outside of the filter holes 245. It should be noted that when dealing with particles trapped within the filter holes 245, since the particles do not penetrate the filter holes 245, they move directly outward in the direction of their location, thus preventing the filter holes 245 from expanding. This prevents localized expansion of the filter holes 245, which could affect the particle blocking effect.

[0055] The first sheet layer 243 and the second sheet layer 244 are both vertical metal sheets, and their upper and lower side surfaces are in contact with the first end cover 21 and the second end cover 22 respectively.

[0056] Specifically, both layer 1 243 and layer 2 244 are metal sheets. The thickness of the metal sheets directly affects the depth of the filter hole 245. The particles stuck in the filter hole 245 have a small contact area with the inner wall of the filter hole 245, and the particles in the filter hole 245 are easily picked out. At the same time, layer 1 243 and layer 2 244 are folded and squeezed against each other, so the particles are easily squeezed, making it easier for the particles to be pushed out.

[0057] like Figure 9 As shown, the side where layer one 243 and layer two 244 are close to each other has a longitudinally extending connecting cavity 247, and the side where layer one 243 and layer two 244 are close to each other presents arc surfaces that fit together, and the axis of the connecting cavity 247 coincides with the axis of the arc surface. A double-axis frame 248 is inserted into the connecting cavity 247 of layer one 243 and layer two 244 for connecting layer one 243 and layer two 244.

[0058] Specifically, the hinged position of sheet layer 1 243 and sheet layer 2 244 is connected by a double-axis frame 248. Both sheet layer 1 243 and sheet layer 2 244 can rotate along the double-axis frame 248. At the same time, sheet layer 1 243 and sheet layer 2 244 are in contact with each other as arc surfaces to avoid the formation of gaps, which would cause impurities to be stuck inside and affect the folding effect.

[0059] The double-axis frame 248 is two parallel rods connected at the ends, which can achieve the functions of support and limitation, and serves as the central axis for the folding of the first layer 243 and the second layer 244.

[0060] A connecting shaft 246 parallel to the axis of the shaft 241 is fixed on both sides of the shaft rod 241. The side where the layer 1 243 and the layer 2 244 are away from each other is also an arc surface, and its arc surface is respectively fitted with the shaft rod 241 on both sides. The connecting shafts 246 relative to the shaft rods 241 on both sides respectively penetrate the layer 1 243 and the layer 2 244 longitudinally, and respectively coincide with the axis of the arc surface on the side where the layer 1 243 and the layer 2 244 are away from each other.

[0061] Specifically, the side of the sheet layer 1 243 and the sheet layer 2 244 that are away from each other is also an arc surface, and the shaft rod 241 on the outside of the sheet layer 1 243 and the sheet layer 2 244 has a connecting shaft 246. The connecting shaft 246 on both sides is inserted into the sheet layer 1 243 and the sheet layer 2 244, and the axes of the connecting shaft 246 on both sides coincide with the axes of the arc surface on the side of the sheet layer 1 243 and the sheet layer 2 244 that are away from each other. That is, the sheet layer 1 243 and the sheet layer 2 244 are in contact with the outer shaft rod 241, and no gap will be generated during rotation, thereby avoiding impurities stuck inside and affecting the rotation.

[0062] The working principle of the present invention is as follows: the main body 1 is an existing submersible pump, and the water inlet component 2 is a filtering component of the submersible pump. During the operation of the submersible pump, water flows inward from the water inlet component 2 to filter the water.

[0063] The water flows from the outside through the filter layer 24 to the inside. Small particles are not affected by the first layer 243 and the second layer 244 and move inward from the filter holes 245. Large particles are blocked on the outside by the filter holes 245. However, medium particles can get stuck in the filter holes 245, causing the filter holes 245 of the first layer 243 and the second layer 244 to be blocked, thus affecting the passage of water. Figure 6-Figure 8 As shown, a group of foldable sheets 242 are in a folded state, and two adjacent shafts 241 are manually pinched together to form Figure 8When the foldable sheet 242 is in the folded state, due to the limitation of the circular groove 1 211 and the circular groove 221, the folded state of the other foldable sheet 242 will be unfolded, and there can only be one folded state. The filter holes 245 on the sheet layer 1 243 and the sheet layer 2 244 that are attached to each other are misaligned, so that the inner side of the filter hole 245 on the sheet layer 1 243 is squeezed against the sheet layer 2 244, and the inner side of the filter hole 245 on the sheet layer 2 244 is squeezed against the sheet layer 1 243, realizing the effect of squeezing from the inside to the outside, squeezing out the particles stuck in the filter hole 245 to avoid entering the interior of the submersible pump.

[0064] It should be noted that even if it is difficult to squeeze out the particles by overlapping layer 1 243 and layer 2 244, layer 1 243 and layer 2 244 can block each other's inner sides of the filter holes 245. When the operator is cleaning, the particles can be squeezed and broken out by poking the filter holes 245, and the particles can also be picked out without having to operate carefully.

[0065] By manually squeezing each group of adjacent shafts 241 , different foldable sheets 242 are folded, and the remaining foldable sheets 242 are restored, completing one circle of operation, cleaning the filter layer 24 and preventing particles from falling into the main body 1 .

[0066] During the operation of the main body 1, the operation can also be performed. Only one group of the foldable sheets 242 is in a folded state, and the rest are unfolded. When another foldable sheet 242 is folded, the foldable sheets 242 of this group will be unfolded, so that the filterable part of the filter layer 24 remains unchanged, and the filtration will not be affected during cleaning, which is almost the same as the existing filter components.

[0067] 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.

[0068] 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 water inlet structure of a filter-type permanent magnet submersible pump, comprising a main body (1) and a water inlet component (2) at the output end of the main body (1), characterized in that: The water inlet component (2) includes: End cover 1 (21) and end cover 2 (22) have their upper and lower axes coincident, and a support frame (23) is installed between the two; The filter layer (24) is respectively secured to the first end cap (21) and the second end cap (22) at its upper and lower ends. The filter layer (24) is formed into a ring shape by interconnecting a plurality of foldable sections. One section is in a folded state by default. When one folded section is folded, the remaining sections are stretched into a fixed state, and the particles at the folded section are squeezed outward.

2. The water inlet structure of the filter type permanent magnet submersible pump according to claim 1 is characterized in that: The upper end of the support frame (23) is fixed to the end cover 1 (21), and the lower end is fixed to the end cover 2 (22), and is used to fix the positions of the end cover 1 (21) and the end cover 2 (22), and the upper end of the end cover 1 (21) is fixed to the main body (1); A support ring (3) whose axis coincides with the end cap (22) is fixed inside the second end cap (22), and the outer side of the support ring (3) is tangent to the filter layer (24) in a stretched state.

3. The water inlet structure of the filter type permanent magnet submersible pump according to claim 1 is characterized in that: The filter layer (24) includes a plurality of shafts (241) and a plurality of groups of foldable sheets (242); A circular groove 1 (211) is formed at the lower end of the first end cover (21), and a circular groove 2 (221) is formed at the upper end of the second end cover (22). Blocks extending into the first circular groove (211) and the second circular groove (221) are fixed at the upper and lower ends of the plurality of shafts (241). The foldable sheets (242) are connected between two adjacent shafts (241), and the plurality of groups of foldable sheets (242) and the plurality of shafts (241) are distributed in an interval circle, wherein one group of foldable sheets (242) is in a folded shape.

4. The water inlet structure of the filter type permanent magnet submersible pump according to claim 3 is characterized in that: The axes of the circular groove 1 (211) and the circular groove 2 (221) coincide with each other and are of the same size, depth and shallowness. The inner and outer side surfaces of the block at the end of the shaft rod (241) are both arc-shaped and fit in with the circular groove 1 (211) and the circular groove 2 (221).

5. The water inlet structure of the filter type permanent magnet submersible pump according to claim 3 is characterized in that: The block at the end of the shaft (241) is made of metal and has a smooth surface. The inner walls of the circular groove 1 (211) and the circular groove 2 (221) are also smooth.

6. The water inlet structure of the filter type permanent magnet submersible pump according to claim 3 is characterized in that: The foldable sheet (242) includes a sheet layer (243) and a sheet layer (244), wherein the sheet layer (243) and the sheet layer (244) are hinged to each other, and the outer sides of the sheet layer (243) and the sheet layer (244) are hinged to the shafts (241) on both sides respectively.

7. The water inlet structure of the filter type permanent magnet submersible pump according to claim 6, characterized in that: Both the sheet layer 1 (243) and the sheet layer 2 (244) have filter holes (245) for filtering. When the sheet layer 1 (243) and the sheet layer 2 (244) are folded, they fit together and the filter holes (245) on the sheet layer 1 (243) and the sheet layer 2 (244) are staggered. When unfolded, they form a straight line.

8. The water inlet structure of the filter-type permanent magnet submersible pump according to claim 6, characterized in that: The sheet layer 1 (243) and the sheet layer 2 (244) are both longitudinally vertical metal sheets, and the upper and lower side surfaces are in contact with the end cover 1 (21) and the end cover 2 (22) respectively.

9. The filter-type permanent magnet submersible pump water inlet structure according to claim 6, characterized in that: The sides of the sheet layer 1 (243) and the sheet layer 2 (244) that are close to each other both have a longitudinally extending connecting cavity (247), and the sides of the sheet layer 1 (243) and the sheet layer 2 (244) that are close to each other present arc surfaces that fit together, and the axis of the connecting cavity (247) coincides with the axis of the arc surface. A double-axis frame (248) is inserted into the connecting cavity (247) of the sheet layer 1 (243) and the sheet layer 2 (244) for connecting the sheet layer 1 (243) and the sheet layer 2 (244).

10. The water inlet structure of the filter-type permanent magnet submersible pump according to claim 6, characterized in that: A connecting shaft (246) parallel to the axis of the shaft (241) is fixed on both sides of the shaft (241). The side of the sheet layer 1 (243) and the sheet layer 2 (244) away from each other is also an arc surface, and the arc surface is respectively fitted with the shaft (241) on both sides. The connecting shafts (246) relative to the shafts (241) on both sides respectively penetrate the sheet layer 1 (243) and the sheet layer 2 (244) longitudinally, and respectively coincide with the axis of the arc surface on the side of the sheet layer 1 (243) and the sheet layer 2 (244) away from each other.

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