Water inlet connecting frame for low-lift multi-stage pump and low-lift multi-stage pump

Abstract

The utility model relates to the field of submersible pumps, in particular to a water inlet connecting frame for a low-lift multi-stage pump and the low-lift multi-stage pump. The water inlet connecting frame comprises an outer ring, an inner ring and an inner ring, wherein a first bolt hole is formed in the outer ring; a first annular groove for accommodating the first sealing ring is formed in the outer ring; a limiting ring is formed on the outer ring; a second bolt hole suitable for being connected with the lower bearing seat is formed in the inner ring, and a second annular groove for containing a second sealing ring is formed in the side, facing the lower bearing seat, of the inner ring; the connecting piece is connected with the outer ring and the inner ring; and the abutting ring is fixedly connected with the inner ring and the connecting piece. According to the water inlet connecting frame for the low-lift multi-stage pump, the outer ring can be stably and hermetically fixed between the outer cover and the base, the inner ring can be stably and hermetically connected with the lower bearing seat, and the abutting ring can be matched with the lower pump shell to fix the guide vane, so that partial functions of an original water inlet joint are replaced, the structure is simple, and the design difficulty and the manufacturing difficulty are low.

Description

Technical Field

[0001] The utility model relates to the field of submersible pumps, in particular to a water inlet connecting frame for a low-lift multistage pump and the low-lift multistage pump. Background Art

[0002] A submersible pump is a centrifugal pump that is driven underwater by an electric motor. Depending on the number of impellers, submersible pumps can be divided into low-lift submersible pumps, medium-lift submersible pumps, and high-lift submersible pumps.

[0003] A Chinese invention patent application, publication number CN108194372A, discloses an amphibious vertical sand-draining pump. This vertical sand-draining pump comprises a cylindrical pump body with a water inlet at the bottom and a water outlet at the top. The pump body is sequentially equipped with a top cover, an upper bearing seat, a lower bearing seat, a lower pump casing, and a base. An axial-flow impeller is mounted at the end of the rotating shaft of the pump motor, and an overflow pipe connected to a water inlet section is located inside the water inlet. However, the pump body and base, as well as the lower bearing seat and lower pump casing, are connected via a water inlet section. This section also mates with the impeller and guide vanes, resulting in a complex structure and significant design and manufacturing challenges.

[0004] Therefore, this field needs a new technical solution to solve the above problems. Summary of the Invention

[0005] In order to improve or solve the technical problems in the prior art of the complicated structure of the water inlet section and the difficulty in design and manufacturing, the utility model provides a water inlet connecting frame for a low-lift multi-stage pump, which forms a sealed connection with the pump body, connects to the lower bearing seat, and cooperates with the lower pump casing to install and fix the guide vanes. The water inlet connecting frame includes: an outer ring, suitable for being arranged between the outer cover and the base of the pump body, and having a first bolt hole on the outer ring; a first annular groove for accommodating a first sealing ring on the side of the outer ring facing the outer cover; a limiting ring formed on the side of the outer ring facing the base; an inner ring, a second bolt hole suitable for connecting to the lower bearing seat on the inner ring, and a second annular groove for accommodating a second sealing ring on the side of the inner ring facing the lower bearing seat; a connecting piece connecting the outer ring and the inner ring, and a plurality of them are evenly and spacedly arranged along the circumference of the outer ring; an abutment ring, suitable for abutting with the guide vanes, and forming a fixed connection with the inner ring and the connecting piece.

[0006] The utility model is used for the water inlet connecting frame of a low-lift multi-stage pump, which includes an outer ring, an inner ring, a connecting piece and an abutting ring. Among them, the outer ring is suitable for being arranged between the outer cover and the base, and a first sealing ring and a limit ring are arranged on the outer ring, which can make the outer ring stably and tightly fixed on the pump body, thereby ensuring the structural stability and sealing of the multi-stage pump. A second bolt hole is provided on the inner ring, which can be connected to the lower bearing seat, so as to stably fix the lower bearing seat on the pump body. The abutting ring is connected to the inner ring and the connecting piece, and abuts against the guide vane, so as to more conveniently cooperate with the lower pump casing to fix the guide vane. Through the above-mentioned arrangement, the utility model is used for the water inlet connecting frame of a low-lift multi-stage pump, and the outer ring can be stably and tightly fixed between the outer cover and the base, the inner ring can be stably and tightly connected to the lower bearing seat, and the abutting ring can cooperate with the lower pump casing to fix the guide vane, thereby replacing part of the functions of the original water inlet section, with a simple structure and low design and manufacturing difficulty.

[0007] Furthermore, an abutment groove suitable for matching with the guide vane is formed on the abutment ring.

[0008] Furthermore, the inner ring includes a limiting portion suitable for being sleeved on the circumferential outer side of the impeller, and a connecting portion with the second bolt hole; and a limited step is formed on the inner circumferential surface of the connecting portion.

[0009] Furthermore, the limiting portion and the connecting portion are connected via an arc surface.

[0010] In order to improve or resolve the technical problem in the prior art that the removal of the water inlet section affects the installation and fixation of the lower bearing seat, the present invention provides a low-lift multi-stage pump. The low-lift multi-stage pump comprises: a pump body, including an outer cover and a base sealed with the outer cover; a lower bearing seat; guide vanes; a lower pump casing for mounting the guide vanes; and a water inlet connecting frame for a low-lift multi-stage pump as described in any of the above, wherein the outer ring of the water inlet connecting frame is fixedly connected to the pump body; the inner ring of the water inlet connecting frame is fixedly connected to the lower bearing seat; and the abutment ring of the water inlet connecting frame abuts against the guide vanes.

[0011] Furthermore, a first sealing ring is arranged between the inner ring and the impeller.

[0012] Furthermore, a third sealing ring is arranged between the abutment ring and the guide vane.

[0013] Furthermore, the guide vanes and the impeller are installed between the water inlet connecting frame and the lower pump casing; the lower pump casing is arranged between the water inlet connecting frame and the base, and is fixedly connected to the outer cover, the water inlet connecting frame, and the base.

[0014] In summary, compared with the prior art, the present invention has the following beneficial effects:

[0015] (1) The outer ring is suitable for being arranged between the outer cover and the base, and a first sealing ring and a limit ring are arranged on the outer ring, which can make the outer ring stably and sealedly fixed on the pump body, thereby ensuring the structural stability and sealing of the multi-stage pump; a second bolt hole is opened on the inner ring, which can be connected with the lower bearing seat, thereby stably fixing the lower bearing seat on the pump body; the abutment ring is connected to the inner ring and the connecting piece, and abuts with the guide vane, which can more conveniently cooperate with the lower pump casing to fix the guide vane, thereby replacing part of the function of the original water inlet section, with a simple structure and low design and manufacturing difficulty. BRIEF DESCRIPTION OF THE DRAWINGS

[0016] The preferred embodiments of the present invention are described below with reference to the accompanying drawings, in which:

[0017] Figure 1 It is a schematic diagram of an embodiment of the low-lift multi-stage pump of the utility model;

[0018] Figure 2 This is a top view of an embodiment of a water inlet connecting frame in a low-lift multi-stage pump of the utility model;

[0019] Figure 3 It is a cross-sectional view of an embodiment of a water inlet connecting frame in a low-lift multi-stage pump of the utility model.

[0020] List of reference numerals: 1. water inlet connecting frame; 11. outer ring; 111. first bolt hole; 112. first annular groove; 113. first sealing ring; 114. limiting ring; 12. inner ring; 121. connecting portion; 122. limiting portion; 123. second bolt hole; 124. second annular groove; 125. second sealing ring; 126. limiting step; 13. connecting member; 14. abutting ring; 2. pump body; 21. outer cover; 22. base; 3. motor Components; 31. Motor housing; 32. Stator; 33. Rotor; 34. Rotating shaft; 35. Outlet structure; 351. Outlet box; 352. Cable gland; 353. Cable pressure plate; 36. Upper bearing seat; 361. Terminal block; 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; 7. Lower pump housing; 8. First sealing ring; 9. Third sealing ring. DETAILED DESCRIPTION

[0021] The preferred embodiments of the present invention are described below with reference to the accompanying drawings. Those skilled in the art should understand that these embodiments are only used to explain the technical principles of the present invention and are not intended to limit the scope of protection of the present invention.

[0022] It should be noted that in the description of this utility model, terms such as "upper," "lower," "left," "right," "inner," and "outer" indicating directions or positional relationships are based on the directions or positional relationships shown in the accompanying drawings. This is merely for ease of description and does not indicate or imply that the device or component described must have a specific orientation, be constructed, or operate in a specific orientation. Therefore, it should not be understood as limiting the utility model. Furthermore, the terms "first" and "second" are used for descriptive purposes only and should not be understood to indicate or imply relative importance.

[0023] Furthermore, it should be noted that, in the description of this utility model, unless otherwise expressly specified or limited, the terms "installed," "set," and "connected" should be understood in a broad sense. For example, they may refer to fixed connections, detachable connections, or integral connections; they may refer to direct connections, indirect connections through an intermediate medium, or internal communication between two components. Those skilled in the art will understand the specific meanings of the above terms in this utility model based on the specific circumstances.

[0024] In order to improve or solve the technical problems of the prior art in that the water inlet joint has a complex structure and is difficult to design and manufacture, the present invention provides a water inlet connecting frame for a low-head multi-stage pump. The water inlet connecting frame 1 comprises: an outer ring 11, adapted to be arranged between the outer cover 21 and the base 22 of the pump body 2, and having a first bolt hole 111 formed on the outer ring 11; a first annular groove 112 formed on the side of the outer ring 11 facing the outer cover 21, for accommodating a first sealing ring 113; a limit ring 114 formed on the side of the outer ring 11 facing the base 22; an inner ring 12, adapted to be connected to the lower bearing seat 6, and having a second annular groove 124 formed on the side of the inner ring 12 facing the lower bearing seat 6, for accommodating a second sealing ring 125; a connecting member 13 connecting the outer ring 11 and the inner ring 12, and having a plurality of connecting members 13 arranged uniformly and spaced apart along the circumference of the outer ring 11; and an abutting ring 14, adapted to abut against the guide vane 4, and forming a fixed connection with the inner ring 12 and the connecting member 13.

[0025] Figure 1 This is a schematic diagram of an embodiment of the low-lift multi-stage pump of the utility model. Figure 2 This is a top view of an embodiment of the water inlet connecting frame in the low-lift multi-stage pump of the utility model. Figure 3 This is a cross-sectional view of an embodiment of the water inlet connection frame in the low-lift multi-stage pump of the utility model. Figure 1 、 Figure 2 and Figure 3 As shown, in one or more embodiments, the water inlet connecting frame 1 for a low-lift multi-stage pump of the present invention includes an outer ring 11 , an inner ring 12 , a connecting piece 13 and an abutting ring 14 .

[0026] Continue to see Figure 1 、 Figure 2 and Figure 3 In one or more embodiments, the outer ring 11 is in the form of a roughly circular ring, and is provided with a first bolt hole 111. A plurality of first bolt holes 111 are evenly and spaced apart along the circumference of the outer ring 11. Exemplarily, there are 12 first bolt holes 111, and the 12 first bolt holes 111 are spaced apart. Specifically, the outer ring 11 is fixedly connected to the pump body 2 via bolts that match the first bolt holes 111. Furthermore, the outer ring 11 has a first side surface and a second side surface that are opposite to each other, the first side surface being adapted to face the outer cover 21, and the second side surface being adapted to face the base 22. A first annular groove 112 is provided on the first side surface, and a first sealing ring 113 is arranged in the first annular groove 112. The first sealing ring 113 abuts against the outer cover 21 to enhance the sealing between the outer ring 11 and the outer cover 21. Furthermore, a limiting ring 114 is formed on the second side surface, and the limiting ring 114 is close to the inner side of the outer ring 11.

[0027] Continue to see Figure 1 、 Figure 2 and Figure 3 In one or more embodiments, the inner ring 12 includes a connecting portion 121 adapted to be connected to the lower bearing seat 6 and a limiting portion 122 adapted to be sleeved on the circumferential outer side of the impeller 5. Specifically, the connecting portion 121 is generally annular and has a second bolt hole 123 formed therein. The connecting portion 121 and the lower bearing seat 6 are fixedly connected via bolts that match the second bolt hole 123. Furthermore, a second annular groove 124 is formed on the side of the connecting portion 121 facing the lower bearing seat 6. A second sealing ring 125 is disposed within the second annular groove 124. The second sealing ring 125 abuts against the lower bearing seat 6 to enhance the sealing between the lower bearing seat 6 and the connecting portion 121. Furthermore, a limiting step 126 is formed on the inner circumferential surface of the connecting portion 121. The limiting step 126 protrudes toward the middle of the connecting portion 121 and is used to support the lower bearing seat 6 after deformation. Furthermore, the limiting portion 122 and the connecting portion 121 are connected via an arc surface to enhance the structural continuity of the limiting portion 122 and the connecting portion 121 , making the inner ring 12 more solid and stable.

[0028] Continue to see Figure 1 、 Figure 2 and Figure 3, the connecting piece 13 is used to connect the outer ring 11 and the inner ring 12. In one or more embodiments, a plurality of connecting pieces 13 are evenly and spaced apart along the circumference of the outer ring 11, and the two ends of each connecting piece 13 are fixedly connected to the outer ring 11 and the inner ring 12 respectively. Specifically, there are six connecting pieces 13, and each connecting piece 13 is spaced 60° apart. Further, the two ends of the connecting piece 13 are connected to the inner ring 12 and the outer ring 11 through an arc surface. Furthermore, an abutment groove is formed on the abutment ring 14, so that the abutment ring 14 is roughly in the shape of a stepped ring. The inner side of the abutment ring 14 is fixedly connected to the inner ring 12, and the upper side surface of the abutment ring 14 is fixedly connected to the connecting piece 13. Exemplarily, the abutment ring 14 and the inner ring 12 are integrally formed. It can be understood that the water inlet connecting frame 1 of the present invention can be used for both single-stage pumps and multi-stage pumps.

[0029] To improve or resolve the technical issues in the prior art of complex water inlet structures and the difficulty in design and manufacturing, the present invention also provides a low-lift multi-stage pump. The low-lift multi-stage pump comprises a pump body 2, including an outer housing 21 and a base 22 sealed with the outer housing 21; a lower bearing seat 6; guide vanes 4; a lower pump casing 7 for mounting the guide vanes 4; and a water inlet connecting frame 1 for the low-lift multi-stage pump, wherein the outer ring 11 of the water inlet connecting frame 1 is fixedly connected to the pump body 2; the inner ring 12 of the water inlet connecting frame 1 is fixedly connected to the lower bearing seat 6; and the abutment ring 14 of the water inlet connecting frame 1 abuts against the guide vanes 4.

[0030] Continue to see Figure 1 、 Figure 2 and Figure 3 In one or more embodiments, the low-lift multi-stage pump of the present invention includes a pump body 2, a motor assembly 3 mounted within the pump body 2, a lower bearing seat 6, a water inlet connecting frame 1, guide vanes 4, an impeller 5, and a lower pump casing 7. The water inlet connecting frame 1 and the lower pump casing 7 cooperate to replace the original water inlet section.

[0031] Continue to see Figure 1 、 Figure 2 and Figure 3 In one or more embodiments, the pump body 2 includes an outer cover 21 and a base 22 detachably connected to the outer cover 21. A drain port is provided on the outer cover 21 and is located at the top of the outer cover 21. Furthermore, a through hole is provided at the top of the outer cover 21 to facilitate the extension of the cable.

[0032] Continue to participate Figure 1 、 Figure 2 and Figure 3In one or more embodiments, the motor assembly 3 includes a motor housing 31 fixedly connected to 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 an outlet structure 35 connected to the motor housing 31 and the pump body 2. Specifically, the upper end of the motor housing 31 is connected to an upper bearing seat 36, and the upper bearing seat 36 is fixedly connected to the motor housing 31 by bolts and spring washers. A terminal 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 an upper bearing retaining ring. One end of the rotating shaft 34 is rotatably arranged in the deep groove ball bearing 362. Furthermore, the lower end of the motor housing 31 is connected to the lower bearing seat 6, and the lower bearing seat 6 is sealed and fixedly connected to the motor housing 31 by an O-ring and bolts. An angular contact ball bearing 61 is arranged on the lower bearing seat 6 and is mounted within the lower bearing seat 6 via a lower bearing gland. One end of the rotating shaft 34 passes through the angular contact ball bearing 61 and rotates synchronously with the impeller 5 via a keyway structure. Furthermore, a mechanical seal 62 is arranged between the lower bearing seat 6 and the rotating shaft 34. Below the lower bearing seat 6, a sealing chamber cover 63 is arranged to house the mechanical seal 62. The sealing chamber cover 63 is securely connected to the lower bearing seat 6 via an O-ring and bolts. Furthermore, the outlet structure 35 includes an outlet box 351, a cable gland 352 securely connected to the outlet box 351, and a cable pressure plate 353 mounted on the gland 352. Specifically, the outlet box 351 is securely connected to the upper bearing seat 36 via bolts and a sealing ring. The cable gland 352 is securely connected to the outlet box 351 via bolts. The cable pressing plate 353 presses the cable pressing sleeve 352, thereby fixing the cable in the cable pressing sleeve 352. Furthermore, the end of the cable pressing sleeve 352 away from the outlet box 351 is in a trumpet shape.

[0033] Continue to see Figure 1 、 Figure 2 and Figure 3 In one or more embodiments, the outer ring 11 of the water inlet connecting frame 1 is arranged between the outer cover 21 and the base 22, and is fixedly connected to the outer cover 21 and the base 22 by bolts. Specifically, the lower pump casing 7 is arranged between the outer ring 11 and the base 22, and the outer cover 21, the outer ring 11, the lower pump casing 7 and the base 22 are arranged in sequence and fixedly connected by bolts and nuts. Furthermore, a first sealing ring 113 is arranged between the outer cover 21 and the outer ring 11, and a second sealing ring 125 is arranged between the inner ring 12 and the lower bearing seat 6. Furthermore, a first sealing ring 8 is arranged between the inner ring 12 and the impeller 5, and a third sealing ring 9 is arranged between the abutment ring 14 and the guide vane 4. Specifically, the impeller 5 is sleeved on the circumferential outer side of the rotating shaft 34 and rotates synchronously with the rotating shaft 34. The guide vane 4 is fixed between the abutment ring 14 and the lower pump casing 7.

[0034] Thus far, the technical solutions of the present invention have been described in conjunction with the preferred embodiments shown in the accompanying drawings. However, it will be readily understood by those skilled in the art that the scope of protection of the present invention is clearly not limited to these specific embodiments. Without departing from the principles of the present invention, those skilled in the art may make equivalent changes or substitutions to the relevant technical features, and such changes or substitutions will fall within the scope of protection of the present invention.

Claims

1. A water inlet connection frame for a low-lift multi-stage pump, characterized in that: include: An outer ring (11) is adapted to be arranged between an outer cover (21) and a base (22) of a pump body (2), and a first bolt hole (111) is provided on the outer ring (11); a first annular groove (112) for accommodating a first sealing ring (113) is provided on a side of the outer ring (11) facing the outer cover (21); and a limiting ring (114) is formed on a side of the outer ring (11) facing the base (22); An inner ring (12), wherein a second bolt hole (123) suitable for connecting to a lower bearing seat (6) is formed on the inner ring (12), and a second annular groove (124) for accommodating a second sealing ring (125) is formed on a side of the inner ring (12) facing the lower bearing seat (6); a connecting member (13) connecting the outer ring (11) and the inner ring (12), and a plurality of connecting members (13) are evenly and spaced apart along the circumference of the outer ring (11); The abutment ring (14) is suitable for abutting against the guide vane (4) and forming a fixed connection with the inner ring (12) and the connecting member (13).

2. The water inlet connecting frame for a low-lift multistage pump according to claim 1, characterized in that: An abutment groove suitable for matching with the guide vane (4) is formed on the abutment ring (14).

3. The water inlet connecting frame for a low-lift multi-stage pump according to claim 1, characterized in that: The inner ring (12) comprises a limiting portion (122) adapted to be sleeved on the circumferential outer side of the impeller (5), and a connecting portion (121) provided with the second bolt hole (123); a limited step (126) is formed on the inner circumferential surface of the connecting portion (121).

4. The water inlet connecting frame for a low-lift multi-stage pump according to claim 3, characterized in that: The limiting portion (122) is connected to the connecting portion (121) via an arc surface.

5. A low-lift multistage pump, characterized in that: include: A pump body (2) comprising an outer cover (21) and a base (22) sealed with the outer cover (21); Lower bearing seat (6); Guide vanes (4); A lower pump casing (7) for mounting the guide vanes (4); and The water inlet connecting frame (1) for a low-lift multi-stage pump according to any one of claims 1 to 4, wherein the outer ring (11) of the water inlet connecting frame (1) is fixedly connected to the pump body (2); the inner ring (12) of the water inlet connecting frame (1) is fixedly connected to the lower bearing seat (6); and the abutment ring (14) of the water inlet connecting frame (1) abuts against the guide vane (4).

6. The low-lift multistage pump according to claim 5, characterized in that: A first sealing ring (8) is arranged between the inner ring (12) and the impeller (5).

7. The low-lift multistage pump according to claim 6, characterized in that: A third sealing ring (9) is arranged between the abutment ring (14) and the guide vane (4).

8. The low-lift multistage pump according to claim 6, characterized in that: The guide vanes (4) and the impeller (5) are installed between the water inlet connecting frame (1) and the lower pump casing (7); the lower pump casing (7) is arranged between the water inlet connecting frame (1) and the base (22), and is fixedly connected to the outer cover (21), the water inlet connecting frame (1), and the base (22).

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