Segmented multi-stage centrifugal pump

Abstract

The utility model relates to a sectional multi-stage centrifugal pump which comprises a water outlet shell, a plurality of middle shells and a water inlet shell, impeller assemblies are arranged in the water inlet shell, the water outlet shell and the middle shells, and a plurality of pull rod assemblies are arranged on the peripheral walls of the middle shells. The utility model relates to the technical field of multi-stage pumps. According to the sectional type multi-stage centrifugal pump, when the two middle shells are connected with each other, the two middle shells are closed with each other, sealing convex rings at the corresponding positions are inserted into sealing ring grooves, a locking plate corresponds to a positioning plate in position, and locking screw holes can be screwed into and locked into positioning nuts by rotating the locking screw holes; when the number of the impeller assemblies of the multi-stage pump is changed, the length of the outer shell of the multi-stage pump can be adjusted only by disassembling the locking screw holes in the corresponding positions, and the purpose of adjusting the number of the impeller assemblies is achieved synchronously.

Description

Technical Field

[0001] This utility model relates to the technical field of multistage pumps, and in particular to a segmental multistage centrifugal pump. Background Technology

[0002] A multistage pump is a centrifugal pump in which the inlet, outlet and intermediate sections are connected by a tie rod. It can output a large water pressure and also relies on the rotation of the impeller to obtain centrifugal force in order to increase the head.

[0003] In the existing technology, the selection of the number of impellers in a multistage pump needs to take into account factors such as head requirements, efficiency, cost and maintenance complexity. When adjusting the number of impellers in an existing multistage pump, the number of intermediate sections needs to be replaced accordingly to avoid large cavities inside the multistage pump.

[0004] Chinese Patent Publication No. CN218347580U discloses an axially split multi-stage segmental centrifugal pump, comprising a pressure-bearing housing and a mounting housing. The mounting housing is mounted on top of the pressure-bearing housing. Several inner cores and impellers are rotatably mounted inside the pressure-bearing housing, and several fixing rods are vertically mounted on top of the pressure-bearing housing. Through the cooperation of the inner cores and impellers, the inner core impellers have a segmented structure. This segmented structure has a short axial dimension, simple structure, and is easy to cast. Furthermore, the segmented impellers offer strong interchangeability and facilitate stage adjustment. With the fixing rods, the mounting housing is connected to the pressure-bearing housing via a top thread, allowing for convenient installation. Simultaneously, through the cooperation of locking blocks and insert blocks, the sealing plate can be easily installed, preventing poor sealing at the connection between the top of the fixing plate and the mounting housing, thus increasing the practicality of the device.

[0005] Although the aforementioned patent features a segmented impeller structure with the cooperation of the inner core and the impeller, the segmented impeller structure has a short axial dimension, simple structure, and is easy to cast. Moreover, the segmented impeller has strong interchangeability and is easy to adjust the number of stages. However, since the pressure-bearing housing and the mounting housing are both set as one piece, it is difficult to adjust the length of the multistage pump housing. Therefore, turbulence zones are easily formed in the position where the impeller is not set, resulting in a reduction in the head of the multistage pump. Utility Model Content

[0006] In view of the shortcomings of the existing technology, the purpose of this utility model is to provide a segmental multistage centrifugal pump to solve the technical problems mentioned in the background.

[0007] The above-mentioned technical objective of this utility model is achieved through the following technical solution:

[0008] A segmental multistage centrifugal pump includes an outlet shell, several intermediate shells, and an inlet shell;

[0009] Impeller assemblies are installed inside the inlet shell, outlet shell, and middle shell, and several tie rod assemblies are installed on the outer peripheral wall of the middle shell;

[0010] The impeller assembly includes a fixed guide vane and a rotating guide vane. The fixed guide vane is fixedly connected to the middle shell. The interior of the fixed guide vane is rotatably connected to a rotating shaft through a sealed bearing. The rotating shaft is inserted into the interior of the rotating guide vane and is fixedly connected to the rotating guide vane.

[0011] Furthermore, one end of the rotating shaft is provided with an insertion rod, and the end of the rotating shaft away from the insertion rod is provided with an inlet, which cooperates with the insertion rod.

[0012] Furthermore, sealing protrusions and sealing grooves are respectively provided at both ends of the middle shell.

[0013] Furthermore, the pull rod assembly includes a positioning plate and a locking plate. The locking plate and the positioning plate are fixedly connected by two pins. Both the locking plate and the positioning plate are fixedly connected to the outer peripheral wall of the middle shell. The locking plate has a sliding hole inside, and a locking screw is slidably installed inside the sliding hole. The positioning plate is fixedly installed at the position corresponding to the sliding hole, and the positioning nut is threadedly engaged with the locking screw.

[0014] Furthermore, the side wall of the water outlet shell is provided with a water outlet pipe, and the end wall of the water outlet shell is provided with a drive shaft, which is inserted into one end of the water outlet shell and has an inlet.

[0015] Furthermore, the side wall of the water inlet shell is provided with a water inlet pipe, and the inside of the water inlet shell is provided with a support shaft. The support shaft is rotatably connected to the water inlet shell through a waterproof bearing, and the end wall of the support shaft is provided with an insertion rod.

[0016] In summary, this utility model has at least one of the following beneficial technical effects:

[0017] 1. This segmental multistage centrifugal pump, when connecting two intermediate shells, closes the two intermediate shells together, inserts the corresponding sealing protrusions into the sealing ring groove, and aligns the locking plate with the positioning plate. By rotating the locking screw hole, the locking screw hole can be screwed into and locked into the positioning nut, thereby achieving the purpose of fixing the adjacent intermediate shells. When changing the number of impeller assemblies in the multistage pump, it is only necessary to remove the corresponding locking screw hole to adjust the length of the multistage pump casing and simultaneously adjust the number of impeller assemblies.

[0018] 2. The segmental multistage centrifugal pump has an insertion rod comprising a cylindrical portion and a protruding portion, and the inlet and the insertion rod are tightly fitted when connected, so that adjacent rotating shafts can be inserted into each other to form a multi-segment shaft. The impeller assembly is located inside the intermediate shell. Therefore, when adjusting the number of impeller assemblies, it is only necessary to remove the intermediate shell at the corresponding position to adjust the number of impeller assemblies. Attached Figure Description

[0019] To more clearly illustrate the technical solutions of the embodiments of this utility model, the accompanying drawings used in the description of the embodiments will be briefly introduced below. Obviously, the drawings described below are only some embodiments of this utility model. For those skilled in the art, other drawings can be obtained based on these drawings without creative effort.

[0020] Figure 1 This is a structural schematic diagram of a segmental multistage centrifugal pump according to the present invention.

[0021] Figure 2 This is a schematic diagram of the middle shell and impeller assembly of a segmental multistage centrifugal pump according to the present invention.

[0022] Figure 3 This is a schematic diagram of the impeller assembly of a segmental multistage centrifugal pump according to the present invention.

[0023] Figure 4 This is a schematic diagram of the outlet shell of a segmental multistage centrifugal pump according to the present invention.

[0024] Figure 5 This is a schematic diagram of the inlet casing of a segmental multistage centrifugal pump according to the present invention.

[0025] In the diagram, 1. Water outlet shell; 11. Water outlet pipe; 12. Drive shaft; 2. Middle shell; 21. Sealing convex ring; 22. Sealing ring groove; 3. Water inlet shell; 31. Water inlet pipe; 32. Support shaft; 4. Impeller assembly; 41. Fixed guide vane; 42. Rotating guide vane; 43. Rotating shaft; 44. Insertion rod; 45. Inlet; 5. Pull rod assembly; 51. Positioning plate; 52. Locking plate; 53. Sliding hole; 54. Locking screw; 55. Positioning nut. Detailed Implementation

[0026] The present invention will be further described in detail below with reference to the accompanying drawings.

[0027] Example:

[0028] Reference Figures 1-5 The present invention discloses a segmental multistage centrifugal pump, comprising an outlet shell 1, several intermediate shells 2 and an inlet shell 3;

[0029] Impeller assemblies 4 are installed inside the inlet shell 3, outlet shell 1 and middle shell 2, and several tie rod assemblies 5 are installed on the outer peripheral wall of the middle shell 2.

[0030] The impeller assembly 4 includes a fixed guide vane 41 and a rotating guide vane 42. The fixed guide vane 41 is fixedly connected to the middle shell 2. The interior of the fixed guide vane 41 is rotatably connected to a rotating shaft 43 through a sealed bearing. The rotating shaft 43 is inserted into the interior of the rotating guide vane 42 and is fixedly connected to the rotating guide vane 42.

[0031] In this embodiment, several intermediate shells 2 are connected in sequence and fixed to each other by tie rod assembly 5. At the same time, the outlet shell 1 and the inlet shell 3 are fixed at both ends of the intermediate shell 2 group to form the body of a multi-stage pump. In use, water is drawn in through the inlet pipe 31 provided on the side wall of the inlet shell 3. After being accelerated by multiple impeller assemblies 4, the water is discharged through the outlet shell 1 and the outlet pipe 11.

[0032] The tie rod assembly 5 is used to fix two adjacent intermediate shells 2, so that the outer shells of the multi-stage pump can be connected independently to each other. The rotating guide vanes 42 installed inside the two adjacent intermediate shells 2 are connected to each other through the plug-in rotating shaft 43, so that the rotating guide vanes 42 can be linked together.

[0033] In a further preferred embodiment of this utility model, such as Figure 2 and Figure 3 As shown, one end of the rotating shaft 43 is provided with an insertion rod 44, and the other end of the rotating shaft 43 away from the insertion rod 44 is provided with an inlet 45, which cooperates with the insertion rod 44.

[0034] In this embodiment, as Figure 2 As shown, the insertion rod 44 includes a cylindrical part and a protrusion part, and the inlet 45 and the insertion rod 44 fit tightly when connected, so that adjacent rotating shafts 43 can be inserted into each other to form a multi-segment shaft, so as to facilitate the adjustment of the number of impeller assemblies 4.

[0035] In a further preferred embodiment of this utility model, such as Figure 2 As shown, sealing protrusions 21 and sealing grooves 22 are respectively provided at both ends of the middle shell 2.

[0036] In this embodiment, by setting the sealing protrusion 21 and the sealing ring groove 22, when the middle shells 2 are connected to each other, the sealing protrusion 21 at the corresponding position is inserted into the inside of the sealing ring groove 22, so as to improve the sealing performance between adjacent middle shells 2.

[0037] In a further preferred embodiment of this utility model, such as Figure 2As shown, the pull rod assembly 5 includes a positioning plate 51 and a locking plate 52. The locking plate 52 and the positioning plate 51 are fixedly connected by two pins. Both the locking plate 52 and the positioning plate 51 are fixedly connected to the outer peripheral wall of the middle shell 2. The locking plate 52 has a sliding hole 53 inside, and a locking screw 54 is slidably arranged inside the sliding hole 53. The positioning plate 51 is fixedly provided with a positioning nut 55 at the position corresponding to the sliding hole 53. The positioning nut 55 is threadedly engaged with the locking screw 54.

[0038] In this embodiment, as Figure 1 and Figure 2 As shown, when connecting the two middle shells 2 to each other, the two middle shells 2 are closed to each other, and the sealing protrusions 21 at the corresponding positions are inserted into the sealing ring grooves 22. The locking plate 52 is aligned with the positioning plate 51. By rotating the locking screw hole, the locking screw hole can be screwed into and locked into the positioning nut 55, thereby achieving the purpose of fixing the adjacent middle shells 2.

[0039] In a further preferred embodiment of this utility model, such as Figure 4 As shown, the side wall of the water outlet shell 1 is provided with a water outlet pipe 11, and the end wall of the water outlet shell 1 is provided with a drive shaft 12. The drive shaft 12 is inserted into one end of the water outlet shell 1 and has an inlet 45.

[0040] In this embodiment, as Figure 4 As shown, the water outlet pipe 11 is used to discharge the water flowing through the multi-stage pump, and the drive shaft 12 is used to connect to the external drive motor. The inlet 45 is set so that the rotating shaft 43 can be connected to the drive shaft 12, so that the external drive motor can work with the drive shaft 12 to drive the internal impeller assembly 4 to rotate.

[0041] In a further preferred embodiment of this utility model, such as Figure 5 As shown, the water inlet shell 3 has a water inlet pipe 31 on its side wall, and a support shaft 32 is provided inside the water inlet shell 3. The support shaft 32 is rotatably connected to the water inlet shell 3 through a waterproof bearing, and an insertion rod 44 is provided on the end wall of the support shaft 32.

[0042] In this embodiment, as Figure 5 As shown, the impeller assembly 4 located inside the water inlet shell 3 is installed via the support shaft 32, and is connected to the impeller assembly 4 via the insertion rod 44. The support shaft 32 is used to position the impeller assembly 4 and improve the stability of the impeller assembly 4 when it rotates.

[0043] The implementation principle of the above embodiment is as follows: several intermediate shells 2 are connected in sequence and fixed to each other by tie rod assembly 5. At the same time, the outlet shell 1 and the inlet shell 3 are fixed at both ends of the intermediate shell 2 group to form the body of the multi-stage pump. When connecting adjacent intermediate shells 2, the insertion rods 44 at both ends of the adjacent rotating shafts 43 are connected to the inlet 45 so that each impeller assembly 4 can be connected to each other. Thus, the length of the multi-stage pump shell can be adjusted while changing the number of impeller assemblies 4 of the multi-stage pump.

[0044] The embodiments described herein are preferred embodiments of this utility model and are not intended to limit the scope of protection of this utility model. Therefore, all equivalent changes made to the structure, shape, and principle of this utility model should be included within the scope of protection of this utility model.

Claims

1. A segmented, multi-stage centrifugal pump characterized by, Including water outlet shell (1), several middle shell (2) and water inlet shell (3); Water inlet shell (3), water outlet shell (1) and middle shell (2) are internally provided with impeller assembly (4), and the outer peripheral wall of middle shell (2) is provided with a plurality of pull rod assemblies (5); Impeller assembly (4) includes fixed guide vane (41) and rotating guide vane (42), fixed guide vane (41) is fixedly connected with middle shell (2), and rotating shaft (43) is rotatably connected in the inside of fixed guide vane (41) through sealing bearing, rotating shaft (43) is inserted into the inside of rotating guide vane (42), and is fixedly connected with rotating guide vane (42); The pull rod assembly (5) includes a positioning plate (51) and a locking plate (52), the locking plate (52) and the positioning plate (51) are fixedly connected by two pin rods, the locking plate (52) and the positioning plate (51) are fixedly connected with the outer peripheral wall of the middle shell (2), the locking plate (52) is provided with a sliding hole (53) in the inside, the sliding hole (53) is provided with a locking screw (54) in the inside, the positioning plate (51) is provided with a positioning nut (55) at the position corresponding to the sliding hole (53), and the positioning nut (55) is screwed with the locking screw (54).

2. A segmented multi-stage centrifugal pump according to claim 1, characterized in that One end of the rotating shaft (43) is provided with an insertion rod (44), and the end of the rotating shaft (43) away from the insertion rod (44) is provided with an inlet (45), and the inlet (45) is matched with the insertion rod (44).

3. A segmented multi-stage centrifugal pump according to claim 2, characterized in that Both ends of the middle shell (2) are provided with sealing convex ring (21) and sealing ring groove (22) respectively.

4. A segmented multi-stage centrifugal pump according to claim 3, characterized in that The side wall of the water outlet shell (1) is provided with a water outlet pipe (11), and the end wall of the water outlet shell (1) is provided with a driving shaft (12), and the end of the water outlet shell (1) is provided with an inlet (45).

5. A segmented multi-stage centrifugal pump according to claim 4, characterized in that The side wall of the water inlet shell (3) is provided with a water inlet pipe (31), and the inside of the water inlet shell (3) is provided with a supporting shaft (32), and the supporting shaft (32) is rotatably connected with the water inlet shell (3) through a waterproof bearing, and the end wall of the supporting shaft (32) is provided with an insertion rod (44).

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