CN215672729U

CN215672729U - Submersible sewage pump

Info

Publication number: CN215672729U
Application number: CN202121731212.9U
Authority: CN
Inventors: 胡凯; 周跃; 王晨; 张锡淼
Original assignee: Shanghai Liancheng Group Co Ltd
Current assignee: Shanghai Liancheng Group Co Ltd
Priority date: 2021-07-28
Filing date: 2021-07-28
Publication date: 2022-01-28
Anticipated expiration: 2031-07-28

Abstract

The utility model relates to a submersible sewage pump, which comprises a casing, a gland, a bearing seat, a rotating shaft, a pump body and an impeller, wherein the top end and the bottom end of the casing are respectively connected with the gland and the bearing seat; a mechanical sealing seat is arranged between the bearing seat and the impeller, the mechanical sealing seat is nested on the rotating shaft, the top end of the mechanical sealing seat is connected with the bearing seat, an annular rib is arranged at the bottom end of the mechanical sealing seat, an installation space is formed by the inner wall of the annular rib and the rotating shaft, a second mechanical sealing ring is arranged, and a sealing seat gap is formed between the end part of the annular rib and the impeller. Compared with the prior art, the mechanical sealing ring has the advantages that the mechanical sealing ring is protected twice, the influence of impurities is avoided, the working stability is improved, the service life is prolonged, and the like.

Description

Submersible sewage pump

Technical Field

The utility model relates to a submersible pump structure, in particular to a submersible sewage pump.

Background

The submersible sewage pump is mainly used for municipal engineering, building construction, industrial sewage disposal, sewage treatment and other occasions, and discharges sewage, wastewater and rainwater containing solid matters and long fibers. In traditional submersible sewage pump structure, only one mechanical seal ring is usually sealed between pivot and the bearing frame in the pump body, and partial long fiber body can produce the winding to mechanical seal ring after getting into the pump body by the impeller export to influence mechanical seal ring normal work, lead to the oil pocket to leak, even fault alarm. Simultaneously, motor wiring is located casing upper end cavity in traditional submersible sewage pump, need reserve the connection that enough high space carries out the cable conductor when using, leads to the use scene to be restricted, and the convenience receives the influence.

SUMMERY OF THE UTILITY MODEL

The present invention is directed to overcoming the above-mentioned disadvantages of the prior art and providing a submersible sewage pump.

The purpose of the utility model can be realized by the following technical scheme:

a submersible sewage pump comprises a casing, a gland, a bearing block, a rotating shaft, a pump body and an impeller, wherein the top end and the bottom end of the casing are respectively connected with the gland and the bearing block;

an annular flange is arranged on the inner wall of the pump body and is positioned on the outer ring of the impeller rear baffle to form an annular gap; the mechanical sealing device is characterized in that a mechanical sealing seat is arranged between the bearing seat and the impeller, the mechanical sealing seat is nested on the rotating shaft, the top end of the mechanical sealing seat is connected with the bearing seat, an annular flange is arranged at the bottom end of the mechanical sealing seat, an installation space is formed by the inner wall of the annular flange and the rotating shaft, a sealing seat gap is formed by the end part of the annular flange and the impeller, a second mechanical sealing ring is arranged in the installation space and comprises a moving coil and a static coil, the static coil of the second mechanical sealing ring is connected with the mechanical sealing seat, and the moving coil is connected with the impeller.

Further, the outer ring of the impeller rear baffle is provided with a convex edge, and an annular gap is formed between the convex edge and the annular flange.

Further, the annular gap is 0.2 mm-0.5 mm.

Furthermore, a sealing baffle is fixed on the impeller, and a sealing seat gap is formed between the end part of the annular rib and the sealing baffle.

Furthermore, one side of the bearing seat is provided with an opening, the opening is provided with a wire holder, and a cable in the casing is arranged in the wire holder.

Furthermore, the lower end of the bearing seat is provided with a through hole for penetrating through the rotating shaft, an annular side plate is arranged at the outer ring of the through hole, the end part of the annular side plate is connected with a mechanical sealing seat, and the first mechanical sealing ring is arranged at the through hole, so that a sealing oil cavity C is formed by the annular side plate, the first mechanical sealing ring and the mechanical sealing seat.

Furthermore, a horizontal oil pipe is arranged on the bearing seat, one end of the oil pipe is communicated with the sealing oil cavity C, an oil port is formed in the outer wall of the bearing seat at the other end of the oil pipe, and a sealing plug is arranged at the oil port.

Furthermore, an oil-water probe is arranged on the side wall of the oil pipe.

Furthermore, a handle frame is arranged at the top end of the machine shell.

Furthermore, a boss is arranged on the side face of the top end of the shell, and the end part of the handle frame is connected with the boss through a bolt.

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

1. the mechanical sealing ring is protected twice, the annular gap is formed by the annular flange and the outer ring of the impeller to cut and crush long-strip impurities, the mechanical sealing ring is prevented from being wound, then the sealing seat gap B is formed by the annular flange of the mechanical sealing seat and the impeller, the cut impurities are ground and crushed, the impurities are prevented from influencing the second mechanical sealing ring through the sealing seat gap B, the second mechanical sealing ring is not prone to generating faults, and the sealing structure is deeply protected.

2. The outer ring of the rear baffle of the impeller is provided with the convex edge, so that the strength and the wear resistance of the outer ring of the impeller are improved, and the reliability of cutting impurities is improved.

3. A sealing baffle is fixed on the impeller, so that the impeller is prevented from being abraded when the sealing seat gap B grinds impurities, and the impeller is protected.

4. The cable leading-out end of the motor is moved from the conventional top end to the side surface of the bearing seat in the middle, the overall height and size of the sewage pump are reduced, the pollution is less limited by the environment, the application range is wider,

5. the sealed oil cavity C is composed of the annular side plate and the mechanical sealing seat, the size of the sealed oil cavity C can be obviously reduced, so that less mechanical oil needs to be injected, the oil quantity is saved, the outer wall of the oil cavity is surrounded by conveyed media, and the cooling effect is favorably improved.

Drawings

FIG. 1 is a schematic structural diagram of the present invention.

Fig. 2 is an enlarged schematic view of a portion of the dredge pump.

Reference numerals: 1. the oil pipe type oil-water separator comprises a machine shell, 101, a boss, 2, a gland, 3, a bearing seat, 31, an annular side plate, 4, a rotating shaft, 5, a pump body, 501, an annular flange, 6, an impeller, 601, an impeller rear baffle, 7, a first mechanical sealing ring, 8, a mechanical sealing seat, 801, an annular flange, 9, a second mechanical sealing ring, 901, a moving coil, 902, a static coil, 10, a sealing baffle, 11, a wiring seat, 12, an oil pipe, 13, a sealing plug, 14, an oil-water probe, 15, a handle frame, 16, a stator coil, 17, a rotor, 18, an upper bearing, 19, a lower bearing, 20, a cable, A, an annular gap, B, a sealing seat gap, C and a sealing oil cavity.

Detailed Description

The utility model is described in detail below with reference to the figures and specific embodiments. The present embodiment is implemented on the premise of the technical solution of the present invention, and a detailed implementation manner and a specific operation process are given, but the scope of the present invention is not limited to the following embodiments.

As shown in fig. 1, the present embodiment provides a submersible sewage pump, which mainly includes a submersible motor part and a sewage pump part.

The submersible motor part comprises a shell 1, a gland 2, a bearing seat 3, a rotating shaft 4, an upper bearing 18, a lower bearing 19, a handle frame 15, a stator coil 16, a rotor 17, a first mechanical sealing ring 7 and a mechanical sealing seat 8. The top end and the bottom end of the casing 1 are respectively connected with the gland 2 and the bearing seat 3 through bolts in a sealing way. The stator coil 16 of the motor is installed in the interior of the housing 1, and the cable 20 on the stator coil 16 is led out from the lower end face of the stator coil 16. The upper bearing 18 is arranged on the gland 2, the lower bearing 19 is arranged on the bearing seat 3, the top end of the rotating shaft 4 is connected with the upper bearing 18, and the bottom end is connected with the lower bearing 19 and penetrates out of the bearing seat 3. The rotor 17 is provided on the rotating shaft 4 at the center of the stator coil 16. A first mechanical seal ring 7 is provided at the junction of the shaft 4 and the bearing housing 3.

The dredge pump portion comprises a pump body 5, an impeller 6 and a second mechanical seal ring 9. The pump body 5 is fixed below the bearing block 3 through bolts, and the impeller 6 is installed inside the pump body 5. The rotating shaft 4 penetrating out of the bearing seat 3 is connected with the impeller 6, and the mechanical seal seat 8 is nested on the rotating shaft 4 and is arranged between the impeller 6 and the bearing seat 3. The top end side of the casing 1 is provided with a boss 101 near the gland 2, and the end of the handle frame 15 is connected with the boss 101 through a bolt.

As shown in fig. 2, an annular flange 501 is provided on the inner wall of the pump body 5, and the annular flange 501 is located at the outer ring of the impeller backplate 601 to form an annular gap a. The annular gap A is typically 0.2mm to 0.5mm, preferably 0.3mm in this embodiment. The top end of the mechanical sealing seat 8 is connected with the bearing seat 3, the bottom end of the mechanical sealing seat is provided with an annular rib 801, the inner wall of the annular rib 801 and the rotating shaft 4 form an installation space, and a second mechanical sealing ring 9 is arranged in the installation space; at the same time, the end of the annular rib 801 and the impeller 6 form a seal seat gap B. The second mechanical seal ring 9 itself comprises a moving coil 901 and a stationary coil 902, the stationary coil 902 is connected with the mechanical seal seat 8, and the moving coil 901 is connected with the impeller 6. In this embodiment, annular gap a and seal receptacle clearance B have formed twice protection to second mechanical seal ring 9, have avoided longer fibrous body or big solid particle etc. to the direct influence of second mechanical seal ring 9 in the medium, improve the reliability, and its principle is as follows:

when the water pump normally runs, the impeller 6 rotates at a high speed, the pump body 5 keeps relatively static, and when fibrous bodies or larger particles and the like in a conveyed medium pass through the annular gap A, the fibrous bodies or the larger particles can be shredded by the outer ring of the impeller 6 rotating at the high speed, so that large impurities can not pass through the annular gap A, and the annular gap A is protected by the second mechanical sealing ring 9.

After passing through the annular gap a, the transport medium may also entrain part of the long fiber bodies. The seal seat gap B formed between the impeller 6 and the mechanical seal seat 8 serves as a second protection, when the impeller 6 rotates at a high speed during operation, the mechanical seal seat 8 is relatively static, and residual fibrous bodies are blocked outside the seal seat gap B and even ground and cannot touch the second mechanical seal ring 9.

As shown in fig. 2, a through hole is provided at the lower end of the bearing housing 3 for passing through the rotating shaft 4, an annular side plate 31 extending downward is provided at the outer ring of the through hole, and the lower end of the annular side plate 31 is hermetically connected to the mechanical seal housing 8 by a bolt. The first mechanical sealing ring 7 is arranged at the through hole, the static ring of the first mechanical sealing ring 7 is connected with the bearing seat 3, and the moving ring of the first mechanical sealing ring is matched with the check ring structure on the rotating shaft 4 for fixing. Thereby, the annular side plate 31, the first mechanical seal ring 7, and the mechanical seal holder 8 form a seal oil chamber C. Because the inner diameter of the annular side plate 31 is only slightly larger than the through hole, the space volume of the sealed oil cavity C is smaller, only a small amount of mechanical oil can be injected, and the oil quantity is saved. And the outer wall of the oil cavity, namely the outer part of the annular side plate 31, is surrounded by the conveyed medium, so that the cooling effect is improved. And a horizontal oil pipe 12 is further arranged on the bearing seat 3, one end of the oil pipe 12 is communicated with the sealed oil cavity C, and the other end of the oil pipe forms an oil port on the outer wall of the bearing seat 3. The oil port is used for filling mechanical oil, and a sealing plug 13 is arranged at the oil port. Meanwhile, an oil-water probe 14 is arranged on the side wall of the oil pipe 12, the oil-water probe 14 is used for detecting whether water exists in the oil cavity, and if water exists, the first mechanical sealing ring 7 fails.

As shown in fig. 1, an opening is further provided at one side of the bearing housing 3, and a wire holder 11 is provided at the opening. The concrete structure is as follows: the end face of the opening is provided with a threaded hole, the side end face of the wire holder 11 is matched with the opening and is hermetically arranged on the side face of the bearing seat 3 through a bolt, and the other opening end face of the wire holder 11 faces upwards. The external cable is hermetically connected with the opening end face of the wire holder 11 through a bolt, and the cable 20 on the stator coil 16 passes through the opening on the side face of the wire holder 11 and is connected with the external cable in the wire holder 11. The structure moves the cable leading-out end of the motor part from the conventional top end to the side surface of the bearing seat 3 in the middle, reduces the overall height size of the sewage pump, is less limited by the environment, has wider application range,

in another embodiment, the impeller 6 is fixed with the seal baffle 10, and a seal seat gap B is formed between the end of the annular rib 801 and the seal baffle 10. This structure avoids seal receptacle clearance B to cause wearing and tearing to impeller 6 when grinding the impurity, protects impeller 6.

In yet another embodiment, the outer ring of the impeller backplate 601 may also be provided with a rim that forms an annular gap a with the annular flange 501. The convex edge structure can improve the strength and the wear resistance of the outer ring of the impeller 6 and improve the reliability of cutting impurities.

The foregoing detailed description of the preferred embodiments of the utility model has been presented. It should be understood that numerous modifications and variations could be devised by those skilled in the art in light of the present teachings without departing from the inventive concepts. Therefore, the technical solutions available to those skilled in the art through logic analysis, reasoning and limited experiments based on the prior art according to the concept of the present invention should be within the scope of protection defined by the claims.

Claims

1. The utility model provides a submersible sewage pump, includes casing (1), gland (2), bearing frame (3), pivot (4), the pump body (5) and impeller (6), gland (2) and bearing frame (3) are connected respectively to the top and the bottom of casing (1), the below at bearing frame (3) is fixed in pump body (5), install inside the pump body (5) impeller (6), gland (2) are connected to the top of pivot (4), and connect impeller (6) after bearing frame (3) is passed to the bottom of pivot (4), be equipped with first mechanical seal ring (7) between pivot (4) and bearing frame (3), its characterized in that:

an annular flange (501) is arranged on the inner wall of the pump body (5), and the annular flange (501) is positioned on the outer ring of the impeller rear baffle (601) to form an annular gap (A); be equipped with mechanical seal seat (8) between bearing frame (3) and impeller (6), this mechanical seal seat (8) nestification is on pivot (4) and top connection bearing frame (3), the bottom of mechanical seal seat (8) is provided with annular flange (801), and the inner wall and pivot (4) of this annular flange (801) form installation space, and the tip and impeller (6) of annular flange (801) form seal seat clearance (B), sets up second mechanical seal ring (9) in installation space, and second mechanical seal ring (9) are including moving coil (901) and quiet circle (902), and mechanical seal seat (8) are connected to its quiet circle (902), and impeller (6) are connected to moving coil (901).

2. A submersible sewage pump according to claim 1, wherein the outer ring of the impeller backplate (601) is provided with a flange, which forms an annular gap (a) with the annular flange (501).

3. A submersible sewage pump according to claim 1 or 2, characterized in that the annular gap (a) is 0.2-0.5 mm.

4. A submersible sewage pump according to claim 1, characterized in that a sealing baffle (10) is fixed to the impeller (6), a sealing seat gap (B) being formed between the end of the annular rib (801) and the sealing baffle (10).

5. A submersible sewage pump according to claim 1, characterized in that the bearing block (3) is provided with an opening at one side, the opening is provided with a wire holder (11), and the cable (20) in the housing (1) is arranged in the wire holder (11).

6. A submersible sewage pump according to claim 1, characterized in that the bearing housing (3) is provided at its lower end with a through hole for passing the shaft (4), that at the outer ring of the through hole there is an annular side plate (31), that the end of the annular side plate (31) is connected to a mechanical sealing seat (8), and that the first mechanical sealing ring (7) is arranged at the through hole, whereby the annular side plate (31), the first mechanical sealing ring (7) and the mechanical sealing seat (8) form a sealed oil chamber C.

7. The submersible sewage pump according to claim 6, wherein the bearing seat (3) is provided with a horizontal oil pipe (12), one end of the oil pipe (12) is communicated with the sealing oil cavity C, the other end of the oil pipe forms an oil port on the outer wall of the bearing seat (3), and the oil port is provided with a sealing plug (13).

8. A submersible sewage pump according to claim 7, wherein the side wall of the oil pipe (12) is provided with an oil and water probe (14).

9. A submersible sewage pump according to claim 1, characterised in that a handle frame (15) is provided at the top end of the housing (1).

10. A submersible sewage pump according to claim 9, wherein the top end side of the housing (1) is provided with a boss (101), and the end of the handle frame (15) is connected with the boss (101) by a bolt.