Blade assembling structure of vertical multi-stage pump

Abstract

The utility model discloses a blade assembly structure of a vertical multi-stage pump, which comprises a pump shaft, and a limiting ring is arranged at the upper end of the pump shaft; a plurality of impeller units which are positioned below the limiting ring and are sequentially stacked are arranged on the pump shaft; the impeller unit comprises an impeller, and the periphery of the impeller is sleeved with a middle section. A shaft sleeve is arranged below the impeller and penetrates through the middle section to abut against the impeller of the other impeller unit below. A water outlet hole is formed in the side part of the middle section of the uppermost impeller unit; a water inlet is formed in the middle section of the lowermost impeller unit; a threaded part is arranged at the lower end of the pump shaft, a locking cap is matched with the threaded part, and the locking cap abuts against the shaft sleeve of the lowermost impeller unit. All parts on the pump shaft are fixedly connected with the pump shaft, so that the distance between the parts is prevented from being increased after long-time operation, and the working stability is improved.

Description

Technical Field

[0001] The utility model relates to a blade assembly structure of a vertical multistage pump, belonging to the technical field of vertical multistage pumps. Background Art

[0002] A multi-stage vertical pump is different from a single-stage centrifugal pump. It relies on the fluid to be pressurized multiple times to obtain the expected dust emission. Specifically, when the motor drives the impeller on the shaft to rotate at high speed, the liquid filled in the impeller is thrown from the center of the impeller along the flow channel between the blades to the surroundings of the impeller under the action of centrifugal force. Due to the action of the blades, the pressure and speed of the liquid increase at the same time, and it is led to the next level of impeller through the flow channel of the guide housing. This is the principle. It flows through all the impellers and guide housings one by one, further increasing the pressure energy of the liquid. After each impeller is stacked step by step, a certain head is obtained. For example, the Chinese utility model patent with the authorization announcement number CN2675908 discloses an automatic pressure-stabilizing water supply vertical multistage pump, and specifically discloses a vertical multistage pump composed of various pump components connected in series, the lower part of the vertical multistage pump is connected to the water inlet section, the upper part is connected to the water outlet section, the vertical multistage pump and the water inlet section and the water outlet section are installed with a pump shaft, a motor is installed on the upper part of the pump, the motor drives the pump wheel, the water inlet section is provided with a pump suction port, the water outlet section is provided with a pump outlet, the water outlet section of the pump is connected to the casing, a turbine sleeve of a coupling is installed in the casing, the inner wall of the turbine sleeve matches the turbine, the turbine is directly installed on the pump shaft, there is a pump wheel on the turbine, the pump wheel is directly connected to the motor shaft, the casing is connected to the motor seat, and the motor is installed on the motor seat. During the operation of the multistage pump, due to the rotation of the pump shaft, the distance between the various parts of the multistage pump in the axial direction will change, affecting the pumping efficiency of the multistage pump. Utility Model Content

[0003] The utility model aims to provide a blade assembly structure for a vertical multi-stage pump. The utility model firmly connects various parts on the pump shaft to the pump shaft, prevents the distance between the parts from increasing during long-term operation, and improves the working stability.

[0004] The technical solution of the utility model is as follows: a blade assembly structure of a vertical multi-stage pump, comprising a pump shaft, a limiting ring being provided at the upper end of the pump shaft; a plurality of impeller units located below the limiting ring and stacked in sequence are provided on the pump shaft; the impeller unit comprises an impeller, an outer sleeve of the impeller is provided with a middle section; a shaft sleeve is provided below the impeller, the shaft sleeve passes through the middle section and abuts against the impeller of another impeller unit below; a water outlet is provided on the side of the middle section of the uppermost impeller unit; a water inlet is provided in the middle section of the lowermost impeller unit; a threaded portion is provided at the lower end of the pump shaft, a locking cap is matched on the threaded portion, and the locking cap abuts against the shaft sleeve of the lowermost impeller unit.

[0005] The blade assembly structure of the above-mentioned vertical multi-stage pump, the impeller includes an impeller bottom plate, a plurality of vortex-shaped blades are arranged on the impeller bottom plate, the other end of the blade is connected to the impeller top plate, the impeller top plate is provided with a convex ring, a water inlet groove is arranged in the convex ring, and the water inlet groove is communicated with the blades.

[0006] The blade assembly structure of the vertical multi-stage pump described above, the middle section includes a bowl-shaped middle section body, the middle section body is provided with a circular groove, and the circular groove is wrapped around the outer side of the convex ring.

[0007] In the blade assembly structure of the vertical multistage pump, a connecting frame is provided at the lower end of the lowermost middle section body, and a liquid suction portion is provided at the lower end of the remaining middle section bodies.

[0008] The blade assembly structure of the vertical multi-stage pump described above, the liquid suction part includes a plurality of guide vanes arranged on the lower end surface of the middle section body, the other end surface between the guide vanes is provided with a connecting plate surface; the gap inside the guide vane is connected to the circular groove.

[0009] In the aforementioned blade assembly structure of the vertical multi-stage pump, the outer end surface of the impeller top plate is inclined.

[0010] In the aforementioned blade assembly structure of the vertical multi-stage pump, the water inlet is arranged on the lowermost middle section body and is wrapped around the outside of the convex ring.

[0011] The blade assembly structure of the vertical multi-stage pump described above has a connecting frame provided with a connecting groove, which matches the pump shaft.

[0012] Compared with the prior art, the utility model has the following beneficial effects:

[0013] 1. When the utility model is in use, water first enters the impeller from the water inlet of the lowest impeller unit, and the water flows out from the upper part of the impeller as the impeller rotates, and then is collected by the middle section of the impeller, and the pressure of the water flow's own rotation sends it to the impeller of the upper impeller unit, and the water flows out from the upper part as the impeller rotates, and then is collected by the middle section of the impeller, and thus circulates to the impeller of the uppermost impeller unit, and the water flows out from the upper part as the impeller rotates, and flows out from the water outlet. In this process, the flow rate and pressure of the water flow are increased due to the centrifugal force, and the water discharge requirements of different lifts are achieved. Through the limit ring, the shaft sleeve and the locking cap, the axial pressure between the impellers is increased, so that these impellers are tightly connected to the shaft and will not loosen after long-term use. BRIEF DESCRIPTION OF THE DRAWINGS

[0014] Figure 1 It is a structural schematic diagram of the utility model;

[0015] Figure 2 It is a schematic diagram of the cross-sectional structure of the utility model;

[0016] Figure 3 It is a schematic diagram of the structure of the impeller;

[0017] Figure 4 It is a schematic diagram of the structure of the middle section at the top;

[0018] Figure 5 It is a schematic diagram of the structure of the middle section;

[0019] Figure 6 This is a schematic diagram of the structure of the middle section at the bottom.

[0020] The marks in the accompanying drawings are: 1-pump shaft, 2-limiting ring, 3-impeller unit, 6-impeller, 7-middle section, 8-shaft sleeve, 12-water outlet, 15-water inlet, 16-threaded part, 18-locking cap, 19-impeller bottom plate, 20-blade, 21-impeller top plate, 22-convex ring, 23-water inlet groove, 24-middle section body, 25-circular groove, 28-liquid suction part, 30-guide vane, 31-connecting plate surface, 33-connecting frame, 34-connecting groove. DETAILED DESCRIPTION

[0021] The present invention is further described below in conjunction with the accompanying drawings and embodiments, but they are not intended to limit the present invention.

[0022] Embodiment: A blade assembly structure of a vertical multistage pump, comprising: Figure 1-6 As shown, it includes a pump shaft 1, and a limit ring 2 is provided at the upper end of the pump shaft 1; the pump shaft 1 is provided with a plurality of impeller units 3 located below the limit ring 2 and stacked in sequence, and the number of the impeller units 3 is set according to actual needs; the impeller unit 3 includes an impeller 6, the impeller 6 is interference fit with the pump shaft 1, and the outer sleeve of the impeller 6 is provided with a middle section 7; a shaft sleeve 8 is provided below the impeller 6, and the shaft sleeve 8 passes through the middle section 7 and conflicts with the impeller 6 of another impeller unit 3 below; a water outlet 12 is provided on the side of the middle section 7 of the uppermost impeller unit 3; a water inlet 15 is provided on the middle section 7 of the lowermost impeller unit 3; a threaded portion 16 is provided at the lower end of the pump shaft 1, and a locking cap 18 is matched on the threaded portion 16, and the locking cap 18 conflicts with the shaft sleeve 8 of the lowermost impeller unit 3, and the locking cap 18 applies an axial force to the lowermost shaft sleeve 8 along the threaded portion 16 until the locking cap 18 cannot be twisted. The shaft sleeves 8 of the uppermost and lowermost impeller units 3 are made of rubber, and the shaft sleeve 8 of the middle impeller unit 3 is made of metal. Figure 3 As shown, the impeller 6 includes an impeller bottom plate 19, on which a plurality of vortex-shaped blades 20 are arranged, and the other end of the blades 20 is connected to an impeller top plate 21, on which a convex ring 22 is arranged, and inside the convex ring 22 is a water inlet groove 23, which is in communication with the blades 20. Figure 4As shown in or 5, the middle section 7 includes a bowl-shaped middle section body 24, on which a circular groove 25 is provided, and the circular groove 25 is wrapped around the outside of the convex ring 22. A connecting frame 33 is provided at the lower end of the lowermost middle section body 24, and a liquid suction portion 28 is provided at the lower end of the remaining middle section bodies 24. The liquid suction portion 28 includes a plurality of guide vanes 30 arranged on the lower end surface of the middle section body 24, and a connecting plate surface 31 is provided on the other end surface between the guide vanes 30; the gap inside the guide vanes 30 is connected to the circular groove 25. The outer end surface of the impeller top plate 21 is inclined to reduce the friction area between the impeller top plate 21 and the middle section 7 wrapping the impeller 6 when rotating. The water inlet 15 is arranged on the lowermost middle section body 24 and the water inlet is wrapped around the outside of the convex ring 22. As shown Figure 6 As shown, the connecting frame 33 is provided with a connecting groove 34 , and the connecting groove 34 is interference fit with the pump shaft 1 .

[0023] Working principle:

[0024] When the pump shaft 1 rotates, it drives the impellers 6 of all the impeller units 3 to rotate. Water first enters the impeller 6 from the water inlet 15 of the lowest impeller unit 3. The water flows out from the upper part of the impeller 6 as the impeller 6 rotates, and then is collected by the middle section 7 of the impeller 6. The pressure of the water's own rotation sends it to the impeller 6 of the upper impeller unit 3. The water flows out from the upper part of the impeller 6 as the impeller 6 rotates, and then is collected by the middle section 7 of the impeller 6. It circulates to the impeller 6 of the uppermost impeller unit 3. The water flows out from the upper part of the impeller 6 as the impeller 6 rotates, and then flows out from the water outlet 12. In this process, the flow rate and pressure of the water flow are increased due to the centrifugal force, so as to achieve the water discharge requirements of different lifts. Through the limit ring 2, the shaft sleeve 8 and the locking cap 18, the axial pressure between the impellers 6 is increased, so that these impellers 6 are tightly connected to the shaft and will not loosen after long-term use.

Claims

1. The blade assembly structure of the vertical multistage pump is characterized by: The invention comprises a pump shaft (1), wherein a limiting ring (2) is provided at the upper end of the pump shaft (1); the pump shaft (1) is provided with a plurality of impeller units (3) located below the limiting ring (2) and stacked in sequence; the impeller unit (3) comprises an impeller (6), wherein the outer sleeve of the impeller (6) is provided with a middle section (7); a shaft sleeve (8) is provided below the impeller (6), and the shaft sleeve (8) passes through the middle section (7) and contacts with the impeller (6) of another impeller unit (3) below; a water outlet (12) is provided at the side of the middle section (7) of the uppermost impeller unit (3); and a water inlet (15) is provided at the middle section (7) of the lowermost impeller unit (3); a threaded portion (16) is provided at the lower end of the pump shaft (1), and a locking cap (18) is matched on the threaded portion (16), and the locking cap (18) contacts with the shaft sleeve (8) of the lowermost impeller unit (3).

2. The blade assembly structure of the vertical multistage pump according to claim 1 is characterized in that: The impeller (6) comprises an impeller bottom plate (19), a plurality of vortex-shaped blades (20) are provided on the impeller bottom plate (19), the other ends of the blades (20) are connected to an impeller top plate (21), a convex ring (22) is provided on the impeller top plate (21), a water inlet groove (23) is provided in the convex ring (22), and the water inlet groove (23) is communicated with the blades (20).

3. The blade assembly structure of the vertical multistage pump according to claim 2 is characterized in that: The middle section (7) comprises a bowl-shaped middle section body (24), a circular groove (25) is provided on the middle section body (24), and the circular groove (25) is wrapped around the outer side of the convex ring (22).

4. The blade assembly structure of the vertical multistage pump according to claim 3 is characterized in that: A connecting frame (33) is provided at the lower end of the lowest middle section body (24), and a liquid absorbing portion (28) is provided at the lower ends of the remaining middle section bodies (24).

5. The blade assembly structure of a vertical multistage pump according to claim 4, characterized in that: The liquid suction part (28) comprises a plurality of guide vanes (30) arranged on the lower end surface of the middle section body (24), and the other end surface between the guide vanes (30) is provided with a connecting plate surface (31); the gap inside the guide vanes (30) is connected to the circular groove (25).

6. The blade assembly structure of a vertical multistage pump according to claim 2, characterized in that: The outer end surface of the impeller top plate (21) is inclined.

7. The blade assembly structure of a vertical multistage pump according to claim 3, characterized in that: The water inlet (15) is arranged on the lowermost middle section body (24) and is wrapped around the outside of the convex ring (22).

8. The blade assembly structure of a vertical multistage pump according to claim 4, characterized in that: The connecting frame (33) is provided with a connecting groove (34), and the connecting groove (34) matches with the pump shaft (1).

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