Water inlet connecting structure for high-lift multi-stage pump and high-lift multi-stage pump

Abstract

The utility model relates to the field of submersible multi-stage pumps, in particular to a water inlet connecting structure for a high-lift multi-stage pump and the high-lift multi-stage pump. The water inlet connecting structure comprises a connecting support, a water inlet pipe and a water outlet pipe, the outer cylinder comprises a first outer ring, a second outer ring and an outer connecting cylinder; the inner cylinder comprises a first inner ring and a second inner ring; a first sealing ring suitable for abutting against the impeller is arranged on the inner circumferential wall of the second inner ring. The middle section is in sealing connection with the second outer ring and is suitable for abutting against the lower side wall of the guide vane; a second sealing ring is arranged on the inner circumferential wall of the middle section; and the lower pump shell is fixedly connected with the second outer ring, and a third sealing ring is arranged on the inner circumferential wall of the lower pump shell. According to the water inlet connecting structure for the high-lift multistage pump, an original water-saving section structure is replaced by the connecting support, the middle section and the lower pump shell, the water inlet connecting structure is arranged in a split mode, the structure is simple, the design and manufacturing difficulty is low, and the function of an original water inlet section can be achieved.

Description

TECHNICAL FIELD

[0001] The utility model relates to submersible multistage pump field, and concretely relates to a water inlet connecting structure for high-lift multistage pump and high-lift multistage pump. BACKGROUND

[0002] The multistage submersible pump is a kind of centrifugal pump driven by motor under water.According to the number of impeller, the multistage submersible pump can be divided into low-lift multistage pump, medium-lift multistage pump and high-lift multistage pump.

[0003] The Chinese invention patent application with the application publication number CN108194372A discloses a amphibious vertical sand pump.The vertical sand pump includes a cylindrical pump body with a water inlet at the bottom and a water outlet at the top, a top cover, an upper bearing seat, a middle bearing seat, a lower bearing seat and a base are sequentially arranged in the pump body, the end of the rotating shaft of the water pump motor is provided with an axial flow impeller, and the inner side of the water inlet is provided with an overflow pipe connected with the water inlet section.However, the pump body and the base of the sand pump are connected through the water inlet section, the water inlet section is of integral structure, the structure is complex, and the design and manufacturing difficulty is great.

[0004] Therefore, there is a need for a new technical solution to solve the above problems in the art. SUMMARY

[0005] In order to improve or solve the technical problems that the water inlet section is of integral structure, the structure is complex, and the design and manufacturing difficulty is great in the prior art, the utility model provides a water inlet connecting structure for high-lift multistage pump.The water inlet connecting structure includes: a connecting bracket, including an outer cylinder and an inner cylinder connected with the outer cylinder;The outer cylinder includes a first outer ring adapted to form fixed connection with the pump body, a second outer ring coaxially arranged with the first outer ring, and an outer connecting cylinder connecting the first outer ring and the second outer ring;The inner cylinder includes a first inner ring adapted to form fixed connection with the lower bearing seat, and a second inner ring adapted to abut with the inner peripheral wall and the upper side wall of the guide vane;The inner peripheral wall of the second inner ring is arranged with a first sealing ring adapted to abut with the impeller;Middle section, sealed connection is formed with the second outer ring, and adapted to abut with the lower side wall of the guide vane;The inner peripheral wall of the middle section is arranged with a second sealing ring adapted to abut with the impeller;Lower pump shell, fixed connection is formed with the second outer ring, and sealed connection is formed with the middle section;The inner peripheral wall of the lower pump shell is arranged with a third sealing ring adapted to abut with another impeller.

[0006] In the utility model for high-lift multistage pump's water inlet connecting structure, including connecting support, middle section and lower pump shell. Among them, connecting support includes outer tube and inner tube, outer tube includes first outer ring, second outer ring and outer connecting tube. First outer ring forms fixed connection with pump body, is used for fixing connecting support on pump body. Second outer ring is coaxial with first outer ring arrangement, is used for connecting lower pump shell and fixed middle section between lower pump shell and connecting support. Inner tube includes first inner ring and second inner ring, first inner ring forms fixed connection with lower bearing seat, is used for fixing lower bearing seat. Second inner ring is opposite with the inner peripheral wall and upper side wall of guide vane, middle section is opposite with the lower side wall of guide vane, is used for installing and fixing guide vane. First sealing ring is set up on the inner peripheral wall of second inner ring, second sealing ring is set up on the inner peripheral wall of middle section, is used for limiting and fixing impeller;The inner peripheral wall of lower pump shell is provided with third sealing ring, is used for limiting and fixing another impeller. Through the above-mentioned setting, the utility model for high-lift multistage pump's water inlet connecting structure replaces the original water-saving section structure by connecting support, middle section and lower pump shell, and is split, simple structure, low design and manufacturing difficulty, and can realize the function of the original water inlet section.

[0007] Further, a reinforcing plate is arranged between the first outer ring and the second outer ring;The reinforcing plate forms fixed connection with the outer connecting tube, and a plurality of reinforcing plates are arranged along the circumference of the outer connecting tube.

[0008] Further, a connecting piece connecting the inner tube and the outer tube is arranged between the inner tube and the outer tube, and a plurality of connecting pieces are uniformly and spacedly arranged along the circumference of the outer tube.

[0009] Further, through holes are formed on part of the connecting pieces;Through holes corresponding to the through holes are formed on the outer tube and the inner tube.

[0010] Further, the lower pump shell includes a mounting ring fixedly connected with the second outer ring, a fixing ring mounting the third sealing ring, and a connecting rod connecting the mounting ring and the fixing ring;A plurality of connecting rods are uniformly and spacedly arranged along the circumference of the mounting ring.

[0011] Further, a weight-reducing groove is formed on the fixing ring.

[0012] In order to improve or solve the prior art water inlet section is an integral structure, complex structure, design and manufacture of difficult technical problems, the utility model provides a kind of high-lift multistage pump.The high-lift multistage pump includes: pump body;Lower bearing seat, installed in the pump body;Guide vane, multiple are provided in the pump body, and have upper side wall, lower side wall opposite to the upper side wall, inner circumferential wall, and outer circumferential wall opposite to the inner circumferential wall;Impeller, multiple are rotatably arranged in the pump body, and have opposite upper end and lower end;Any one of the water inlet connection structure for high-lift multistage pump described above, the first outer ring of the water inlet connection structure is fixedly connected with the pump body;The second outer ring of the water inlet connection structure is in abutment with the outer circumferential wall of the guide vane;The first inner ring of the water inlet connection structure is fixedly connected with the lower bearing seat;The second inner ring of the water inlet connection structure is in abutment with the inner circumferential wall of the guide vane, the upper side wall;The first sealing ring of the water inlet connection structure is in abutment with the upper end of the impeller;The middle section of the water inlet connection structure is in abutment with the lower side wall of the guide vane, and the second sealing ring of the water inlet connection structure is in abutment with the lower end of the impeller;The lower pump shell of the water inlet connection structure supports the guide vane, and the third sealing ring of the water inlet connection structure is in abutment with the impeller.

[0013] In summary, compared with the prior art, the utility model has the following beneficial effects:

[0014] (1) the first outer ring is fixedly connected with the pump body, for fixing the connecting support on the pump body.The second outer ring is coaxially arranged with the first outer ring, for connecting the lower pump shell and fixing the middle section between the lower pump shell and the connecting support;The first inner ring is fixedly connected with the lower bearing seat, for fixing the lower bearing seat;The second inner ring is in abutment with the inner circumferential wall and the upper side wall of the guide vane, and the middle section is in abutment with the lower side wall of the guide vane, for installing and fixing the guide vane;The first sealing ring is arranged on the inner circumferential wall of the second inner ring, and the second sealing ring is arranged on the inner circumferential wall of the middle section, for limiting and fixing the impeller;The third sealing ring is arranged on the inner circumferential wall of the lower pump shell, for limiting and fixing another impeller;The original water-saving section structure is replaced by the connecting support, the middle section and the lower pump shell, which are separately arranged, simple in structure, low in design and manufacture difficulty, and can realize the function of the original water inlet section;

[0015] (2) by setting reinforcing plate, connecting piece and weight reduction groove, the stability of the water inlet connection structure is ensured, and the weight of the water inlet connection structure is reduced. BRIEF DESCRIPTION OF DRAWINGS

[0016] The preferred embodiments of the utility model are described below in conjunction with the drawings, and the drawings are as follows:

[0017] Figure 1 It is the schematic diagram of the embodiment of the high-lift multistage pump of the utility model;

[0018] Figure 2 is an embodiment of the connecting support in the high-lift multistage pump of the utility model;

[0019] Figure 3 is Figure 2 is a cross-sectional structure schematic view at A-A in the embodiment;

[0020] Figure 4 is an embodiment of the lower pump shell in the high-lift multistage pump of the utility model;

[0021] Figure 5 is a cross-sectional view of the embodiment of the lower pump shell in the high-lift multistage pump of the utility model.

[0022] List of reference signs: 1, water inlet connecting structure; 11, connecting support; 111, outer cylinder; 1111, first outer ring; 1112, second outer ring; 1113, outer connecting cylinder; 1114, reinforcing plate; 112, inner cylinder; 1121, first inner ring; 1122, second inner ring; 1123, inner connecting cylinder; 1124, first sealing ring; 113, connecting piece; 1131, connecting sleeve; 1132, connecting plate; 1133, through hole; 12, middle section; 121, first section; 122, second section; 123, third section; 124, second sealing ring; 13, lower pump shell; 131, mounting ring; 132, fixing ring; 133, connecting rod; 134, weight-reducing groove; 135, third sealing ring; 2, pump body; 21, outer cover; 22, base; 3, motor assembly; 31, motor shell; 32, stator; 33, rotor; 34, rotating shaft; 35, wire outlet structure; 351, wire outlet box; 352, cable pressing sleeve; 353, cable pressing plate; 36, upper bearing seat; 361, terminal post; 362, deep groove ball bearing; 4, guide vane; 5, impeller; 6, lower bearing seat; 61, angular contact ball bearing; 62, mechanical seal; 63, sealing chamber cover. DETAILED DESCRIPTION

[0023] The preferred embodiments of the utility model are described below with reference to the drawings. Those skilled in the art should understand that these embodiments are only used to explain the technical principles of the utility model, and are not intended to limit the protection scope of the utility model.

[0024] It should be noted that in the description of the utility model, the terms "upper", "lower", "left", "right", "inner", "outer" and the like indicate the direction or positional relationship terms based on the direction or positional relationship shown in the drawings, which are only for the convenience of description, and are not intended to indicate or imply that the device or element must have a particular orientation, be constructed and operated in a particular orientation, and therefore cannot be understood as limiting the utility model. In addition, the terms "first", "second" are only for descriptive purposes, and cannot be understood as indicating or implying relative importance.

[0025] In addition, it needs to be explained that, in the description of the utility model, unless another explicit provision and limitation, the terms "mount", "set", "connect" should be broad sense understanding, for example, can be fixed connection, also can be detachable connection, or integrally connected; can be direct connection, also can be indirect connection through intermediate medium, also can be two element internal communication. For the person skilled in the art, the specific meaning of the above terms in the utility model can be understood according to specific circumstances.

[0026] In order to improve or solve the technical problems of the prior art, the utility model provides a water inlet connecting structure for high-lift multistage pump. The water inlet connecting structure comprises: a connecting support 11, comprising an outer cylinder 111 and an inner cylinder 112 connected with the outer cylinder 111;The outer cylinder 111 comprises a first outer ring 1111 adapted to form fixed connection with the pump body 2, a second outer ring 1112 coaxially arranged with the first outer ring 1111, and an outer connecting cylinder 1113 connecting the first outer ring 1111 and the second outer ring 1112;The inner cylinder 112 comprises a first inner ring 1121 adapted to form fixed connection with the lower bearing seat 6, and a second inner ring 1122 adapted to abut with the inner peripheral wall and the upper side wall of the guide vane 4;The inner peripheral wall of the second inner ring 1122 is arranged with a first sealing ring 1124 adapted to abut with the impeller 5;The middle section 12 is sealingly connected with the second outer ring 1112, and is adapted to abut with the lower side wall of the guide vane 4;The inner peripheral wall of the middle section 12 is arranged with a second sealing ring 124 adapted to abut with the impeller 5;The lower pump shell 13 is fixedly connected with the second outer ring 1112, and is sealingly connected with the middle section 12;The inner peripheral wall of the lower pump shell 13 is arranged with a third sealing ring 135 adapted to abut with another impeller 5.

[0027] Figure 1 It is the schematic diagram of the embodiment of the high-lift multistage pump of the utility model. As shown in Figure 1 , in one or more embodiments, the utility model discloses a water inlet connecting structure 1 for high-lift multistage pump, which comprises a connecting support 11, a middle section 12 and a lower pump shell 13.

[0028] Figure 2 It is the schematic diagram of the embodiment of the connecting support in the high-lift multistage pump of the utility model, Figure 3 It is Figure 2 the cross-sectional structure schematic diagram of A-A in the middle. It can be understood that, Figure 2 In the middle, only part of the structure of the connecting support 11 is shown, and the outer cylinder 111 part is adopted from the bottom, and the inner cylinder 112 part is adopted from the top. As Figure 1 , Figure 2 and Figure 3As shown, the connecting bracket 11 comprises an outer cylinder 111, an inner cylinder 112 and a connecting piece 113 connecting the outer cylinder 111 and the inner cylinder 112. In one or more embodiments, the outer cylinder 111 comprises a first outer ring 1111, a second outer ring 1112 and an outer connecting cylinder 1113 connecting the first outer ring 1111 and the second outer ring 1112. Specifically, the first outer ring 1111 is in the shape of a substantially circular ring. A groove is formed on the first outer ring 1111, which is matched with the outer cover 21 of the pump body 2. A plurality of bolt holes are formed on the first outer ring 1111, which are uniformly and spacedly arranged along the circumference of the first outer ring 1111. The first outer ring 1111 is arranged between the outer cover 21 and the base 22 of the pump body 2, and is fixedly connected with the outer cover 21 and the base 22 by bolts. Further, a sealing ring is arranged between the first outer ring 1111 and the outer cover 21 to enhance the sealing performance of the first outer ring 1111 and the outer cover 21. Further, the second outer ring 1112 is in the shape of a substantially circular ring and is coaxially arranged with the first outer ring 1111. A plurality of bolt holes are formed on the second outer ring 1112, which are uniformly and spacedly arranged along the circumference of the second outer ring 1112, and the second outer ring 1112 is fixedly connected with the lower pump shell 13 by bolts. Further, the outer connecting cylinder 1113 is in the shape of a substantially cylindrical, and two ends of the outer connecting cylinder 1113 are connected with the first outer ring 1111 and the second outer ring 1112 respectively. Further, a reinforcing plate 1114 is arranged on the outer circumferential wall of the outer connecting cylinder 1113, and the reinforcing plate 1114 is in the shape of a substantially right-angled trapezoid, and two ends of the reinforcing plate 1114 are connected with the lower circumferential wall of the first outer ring 1111 and the upper circumferential wall of the second outer ring 1112 respectively. Specifically, a plurality of reinforcing plates 1114 are spacedly arranged along the circumference of the outer connecting cylinder 1113. For example, eight reinforcing plates 1114 are arranged.

[0029] Continuing to refer to Figure 1 , Figure 2 and Figure 3The inner cylinder 112 comprises a first inner ring 1121, a second inner ring 1122 and an inner connecting cylinder 1123. In one or more embodiments, the first inner ring 1121 is substantially annular, and a bolt hole is formed on the first inner ring 1121, and the first inner ring 1121 is fixedly connected to the lower bearing seat 6 by bolts. Further, a groove is formed on the inner circumferential wall of the first inner ring 1121, and a sealing ring is arranged in the groove. The first inner ring 1121 and the lower bearing seat 6 are sealingly connected by the sealing ring. Further, the second inner ring 1122 is substantially annular. A groove is formed on the lower side wall of the second inner ring 1122, and a sealing ring is arranged in the groove, and the second inner ring 1122 is sealingly connected to the guide vane 4 by the sealing ring. Further, a groove is formed on the inner circumferential wall of the second inner ring 1122, and a first sealing ring 1124 is arranged in the groove, and the second inner ring 1122 abuts against the upper end of the impeller 5 by the first sealing ring 1124. Further, the inner connecting cylinder 1123 is substantially cylindrical, and the two ends of the inner connecting cylinder 1123 are connected to the first inner ring 1121 and the second inner ring 1122, respectively.

[0030] Continuing to refer to Figure 1 , Figure 2 and Figure 3 , the connecting piece 113 connects the inner cylinder 112 and the outer cylinder 111, and a plurality of connecting pieces 113 are uniformly and spaced arranged along the circumference of the outer cylinder 111. For example, each connecting piece 113 is spaced apart by 30°. Specifically, the connecting piece 113 comprises a connecting sleeve 1131 and a connecting plate 1132, and the two ends of the connecting sleeve 1131 and the connecting plate 1132 are connected to the inner connecting cylinder 1123 and the outer connecting cylinder 1113, respectively. Further, the connecting sleeve 1131 is uniformly and spaced arranged along the circumference of the outer cylinder 111, and four connecting sleeves 1131 are arranged, and a through hole 1133 penetrating the connecting sleeve 1131 is formed in the connecting sleeve 1131. A through hole corresponding to the through hole 1133 is formed on the inner connecting cylinder 1123 and the outer connecting cylinder 1113. Further, the connecting plate 1132 is provided with eight connecting plates 1132, and two connecting plates 1132 are arranged between adjacent two connecting sleeves 1131. The eight connecting plates 1132 correspond to the eight reinforcing plates 1114 one by one.

[0031] Referring to Figure 1The middle section 12 is provided with a plurality of middle sections 12 which are sealingly connected in sequence. In one or more embodiments, the middle section 12 comprises a first section 121, a second section 122 and a third section 123. The first section 121 is provided with a groove matched with the second outer ring 1112, the upper side of the first section 121 is in abutment with the lower side wall of the guide vane 4, and the inner circumferential wall of the first section 121 is provided with a second sealing ring 124 which is in abutment with the lower end of the impeller 5. A groove is formed in the lower side wall of the first section 121, and a sealing ring is arranged in the groove, so that the first section 121 and the second section 122 are sealingly connected. The second section 122 and the third section 123 have the same structure as the first section 121, and will not be described here.

[0032] Figure 4 is an embodiment of the lower pump shell of the high-lift multi-stage pump of the utility model, Figure 5 is a sectional view of the embodiment of the lower pump shell of the high-lift multi-stage pump of the utility model. As Figure 1 、 Figure 4 and Figure 5 shown, in one or more embodiments, the lower pump shell 13 is fixedly connected with the second outer ring 1112, and the middle section 12 is fixed between the lower pump shell 13 and the connecting bracket 11. Sealing rings are arranged between the connecting bracket 11, the middle section 12 and the lower pump shell 13, so that the three are sealingly connected. Specifically, the lower pump shell 13 comprises a mounting ring 131, a fixing ring 132 and a connecting rod 133. The mounting ring 131 is provided with bolt holes, and the mounting ring 131 is fixedly connected with the second outer ring 1112 through bolts. The inner circumferential wall of the fixing ring 132 is provided with a groove, and a third sealing ring 135 is arranged in the groove, and the third sealing ring 135 is in abutment with the lower end of the lowermost impeller 5. Further, a weight-reducing groove 134 is formed in the fixing ring 132 to reduce the weight of the lower pump shell 13. Further, the two ends of the connecting rod 133 are connected with the mounting ring 131 and the fixing ring 132 respectively, and a plurality of connecting rods 133 are uniformly and spacedly arranged along the circumference of the mounting ring 131. Exemplarily, two connecting rods 133 are arranged.

[0033] In order to improve or solve the prior art water inlet section is an integral structure, complex structure, design and manufacture of difficult technical problems, the utility model provides a high-lift multistage pump. The high-lift multistage pump includes: pump body 2;Lower bearing seat 6 is installed in pump body 2;Guide vane 4, a plurality of are provided in pump body 2, and have upper side wall, lower side wall opposite to upper side wall, inner peripheral wall and outer peripheral wall opposite to inner peripheral wall;Impeller 5, a plurality of are rotatably arranged in pump body 2, and have opposite upper end and lower end;Any one of the water inlet connection structure 1 for high-lift multistage pump, the first outer ring 1111 of water inlet connection structure 1 is formed with fixed connection with pump body 2;The second outer ring 1112 of water inlet connection structure 1 is in abutment with the outer peripheral wall of guide vane 4;The first inner ring 1121 of water inlet connection structure 1 is formed with fixed connection with lower bearing seat 6;The second inner ring 1122 of water inlet connection structure 1 is in abutment with the inner peripheral wall of guide vane 4, upper side wall;The first sealing ring 1124 of water inlet connection structure 1 is in abutment with the upper end of impeller 5;The middle section 12 of water inlet connection structure 1 is in abutment with the lower side wall of guide vane 4, and the second sealing ring 124 of water inlet connection structure 1 is in abutment with the lower end of impeller 5;The lower pump shell 13 of water inlet connection structure 1 supports guide vane 4, and the third sealing ring 135 of water inlet connection structure 1 is in abutment with impeller 5.

[0034] Continuing to refer to Figure 1 The high-lift multistage pump of the utility model includes pump body 2, motor assembly 3, water inlet connection structure 1, lower bearing seat 6, guide vane 4 and impeller 5.

[0035] Continuing to refer to Figure 1 In one or more embodiments, the pump body 2 includes an outer cover 21 and a base 22 detachably connected with the outer cover 21. A drain port is formed on the outer cover 21 and located at the top of the outer cover 21. Further, a through hole is formed at the top of the outer cover 21 for extending a cable.

[0036] Continuing to refer to Figure 1In one or more embodiments, the motor assembly 3 includes a motor housing 31 fixedly connected with the pump body 2, a stator 32 installed in the motor housing 31, a rotor 33 installed in the motor housing 31, a rotating shaft 34 rotatably installed in the motor housing 31, and a wire outlet structure 35 connected with the motor housing 31 and the pump body 2. Specifically, the upper end of the motor housing 31 is connected with an upper bearing seat 36, which is fixedly connected with the motor housing 31 by means of bolts and spring washers. A terminal stud 361 and a deep groove ball bearing 362 are arranged on the upper bearing seat 36, and the deep groove ball bearing 362 is installed in the upper bearing seat 36 by means of an upper bearing retainer. One end of the rotating shaft 34 is rotatably arranged in the deep groove ball bearing 362. Further, the lower end of the motor housing 31 is connected with a lower bearing seat 6, which is fixedly connected with the motor housing 31 by means of O-rings and bolts in a sealed manner. An angular contact ball bearing 61 is arranged on the lower bearing seat 6, and the angular contact ball bearing 61 is installed in the lower bearing seat 6 by means of a lower bearing retainer. One end of the rotating shaft 34 passes through the angular contact ball bearing 61 and is synchronously rotated with the impeller 5 by means of a keyway structure. Further, a mechanical seal 62 is arranged between the lower bearing seat 6 and the rotating shaft 34, and a seal chamber cover 63 for installing the mechanical seal 62 is arranged below the lower bearing seat 6, which is fixedly connected with the lower bearing seat 6 by means of O-rings and bolts in a sealed manner. Further, the wire outlet structure 35 includes a wire outlet box 351, a cable pressing sleeve 352 fixedly connected with the wire outlet box 351, and a cable pressing plate 353 installed on the cable pressing sleeve 352. Specifically, the wire outlet box 351 is fixedly connected with the upper bearing seat 36 in a sealed manner by means of bolts and sealing rings. The cable pressing sleeve 352 is fixedly connected with the wire outlet box 351 by means of bolts. The cable pressing plate 353 presses the cable pressing sleeve 352, thereby fixing the cable in the cable pressing sleeve 352. Further, the end of the cable pressing sleeve 352 away from the wire outlet box 351 is in the shape of a trumpet mouth.

[0037] Continuing to refer to Figure 1 , the guide vanes 4 and the impellers 5 are both provided with four. Specifically, each guide vane 4 has an upper side wall, a lower side wall, an inner peripheral wall, and an outer peripheral wall. The second outer ring 1112 abuts against the outer peripheral wall of the uppermost guide vane 4, the second inner ring 1122 abuts against the inner peripheral wall and the upper side wall of the uppermost guide vane 4, and the first section 121 abuts against the lower side wall of the uppermost guide vane 4. The third section 123 abuts against the upper side wall and the outer peripheral wall of the lowermost guide vane 4, the lower pump shell 13 abuts against the lower side wall of the lowermost guide vane 4, and the inter-stage sleeve on the rotating shaft 34 abuts against the inner peripheral wall of the lowermost guide vane 4. Further, each impeller 5 includes an upper end and a lower end. The first sealing ring 1124 is sleeved on the upper end of the uppermost impeller 5, and the second sealing ring 124 of the first section 121 is sleeved on the lower end of the uppermost impeller 5. The third sealing ring 135 is sleeved on the lower end of the lowermost impeller 5.

[0038] The technical scheme of the utility model has been described in combination with the preferred embodiments shown in the drawings, but it is easy for those skilled in the art to understand that the protection scope of the utility model is obviously not limited to these specific embodiments. Those skilled in the art can make equivalent changes or replacements to the related technical features without departing from the principles of the utility model, and the technical schemes after the changes or replacements will all fall within the protection scope of the utility model.

Claims

1. A water inlet connection structure for a high-lift multi-stage pump, characterized by, The connecting support (11) comprises an outer cylinder (111) and an inner cylinder (112) connected with the outer cylinder (111); the outer cylinder (111) comprises a first outer ring (1111) adapted to form a fixed connection with the pump body (2), a second outer ring (1112) coaxially arranged with the first outer ring (1111), and an outer connecting cylinder (1113) connecting the first outer ring (1111) and the second outer ring (1112); the inner cylinder (112) comprises a first inner ring (1121) adapted to form a fixed connection with the lower bearing seat (6), and a second inner ring (1122) adapted to abut against the inner circumferential wall of the guide vane (4) and the upper side wall; a first sealing ring (1124) adapted to abut against the impeller (5) is arranged on the inner circumferential wall of the second inner ring (1122); a middle section (12) forms a sealed connection with the second outer ring (1112) and is adapted to abut against the lower side wall of the guide vane (4); a second sealing ring (124) adapted to abut against the impeller (5) is arranged on the inner circumferential wall of the middle section (12); a lower pump shell (13) forms a fixed connection with the second outer ring (1112) and forms a sealed connection with the middle section (12); a third sealing ring (135) adapted to abut against the other impeller (5) is arranged on the inner circumferential wall of the lower pump shell (13). A reinforcing plate (1114) is arranged between the first outer ring (1111) and the second outer ring (1112); the reinforcing plate (1114) forms a fixed connection with the outer connecting cylinder (1113) and is arranged in plurality along the circumference of the outer connecting cylinder (1113).

2. The water inlet connection structure for a high-lift multi-stage pump according to claim 1, characterized by, A connecting piece (113) connecting the inner cylinder (112) and the outer cylinder (111) is arranged between the inner cylinder (112) and the outer cylinder (111); the connecting piece (113) is arranged in plurality uniformly and at intervals along the circumference of the outer cylinder (111).

3. The water inlet connection structure for a high-lift multi-stage pump according to claim 2, characterized by, Through holes (1133) penetrating the connecting piece (113) are formed on part of the connecting piece (113); through holes corresponding to the through holes (1133) are formed on the outer cylinder (111) and the inner cylinder (112).

4. The water inlet connection structure for a high-lift multi-stage pump according to claim 3, characterized by, The lower pump shell (13) comprises a mounting ring (131) forming a fixed connection with the second outer ring (1112), a fixed ring (132) mounting the third sealing ring (135), and a connecting rod (133) connecting the mounting ring (131) and the fixed ring (132); the connecting rod (133) is arranged in plurality uniformly and at intervals along the circumference of the mounting ring (131).

5. The water inlet connection structure for a high-lift multi-stage pump according to claim 1, characterized by, A weight-reducing groove (134) is formed on the fixed ring (132).

6. The water inlet connection structure for a high-lift multi-stage pump according to claim 5, characterized by, The pump body (2); 7. A high-lift multi-stage pump, characterized by, The lower bearing seat (6) is mounted in the pump body (2); The guide vane (4) is arranged in plurality in the pump body (2) and has an upper side wall, a lower side wall opposite to the upper side wall, an inner circumferential wall, and an outer circumferential wall opposite to the inner circumferential wall; The impeller (5) is arranged in plurality rotatably in the pump body (2) and has opposite upper and lower ends; ​ ​ The water inlet connecting structure (1) for high-lift multi-stage pump of any one of claims 1-6, a first outer ring (1111) of the water inlet connecting structure (1) is fixedly connected with the pump body (2); a second outer ring (1112) of the water inlet connecting structure (1) abuts against the outer peripheral wall of the guide vane (4); a first inner ring (1121) of the water inlet connecting structure (1) is fixedly connected with the lower bearing seat (6); a second inner ring (1122) of the water inlet connecting structure (1) abuts against the inner peripheral wall and the upper side wall of the guide vane (4); a first sealing ring (1124) of the water inlet connecting structure (1) abuts against the upper end of the impeller (5); a middle section (12) of the water inlet connecting structure (1) abuts against the lower side wall of the guide vane (4), and a second sealing ring (124) of the water inlet connecting structure (1) abuts against the lower end of the impeller (5); a lower pump shell (13) of the water inlet connecting structure (1) supports the guide vane (4), and a third sealing ring (135) of the water inlet connecting structure (1) abuts against the impeller (5).

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