A dry sewage pump

Abstract

The present invention provides a dry sewage pump, which belongs to the technical field of sewage pumps, and comprises a motor assembly, an upper bearing assembly, a fan, an upper cover, a lower bearing assembly, an impeller, fixing bolts, a volute, a water outlet flange, and a water inlet base. The motor assembly comprises a rotating shaft, a rotor, a motor housing, and a stator. The fan, the upper bearing assembly, the rotor, the lower bearing assembly, and a mechanical seal are respectively sleeved on the upper end of the rotating shaft from top to bottom and can rotate with the rotating shaft. An impeller cone sleeve and a sealing gasket are arranged between the impeller and the rotating shaft. The cone sleeve is designed so that the impeller can move up and down in the axial direction according to actual working conditions to pass larger particles of matter, thereby achieving strong sewage discharge capacity and reducing the probability of the pump being blocked. The impeller has strong practicality and broad application prospects.

Description

Technical Field

[0001] The invention belongs to the technical field of sewage pumps, in particular to a dry sewage pump. Background Art

[0002] In recent years, with the rapid development of cities, the amount of urban sewage has also increased, so a large number of urban sewage pipes and sewage pumping stations have to be built and expanded. Dry sewage pumps are the most common centrifugal impurity pumps used in sewage pumps. They are widely used in municipal, environmental protection, sewage treatment, light industry, chemical industry, mining, petroleum, water conservancy, metallurgy and other industries. They are used to transport liquids containing solid particle suspensions or fibrous suspensions. They are energy-intensive and one of the key equipment in related industries. Due to the impurities contained in the transportation, the impeller cavity and the water inlet and outlet are opened in the pump body of the existing sewage pump. This structure is relatively simple and economical in production. However, in the actual operation process, due to the centrifugal force of the impeller rotation, the liquid being transported contains larger particles, which cause the large particles to collide with the inner cavity wall and the impeller of the pump body to produce larger turbulence and eddy currents, resulting in fluid energy consumption and reduced transportation efficiency. At the same time, large particles will also block the pump, causing the pump to fail to work normally, and even burn the motor, thereby causing poor sewage discharge, which has a serious impact on urban life and environmental protection.

[0003] Patent 202121292967.3 discloses a sewage pump, such as Fig. 9 As shown, an arc-shaped baffle 21 matching the water outlet channel is provided on the inner circumferential wall between the water inlet 13-1 and the impeller chamber 20 in the volute 10 of the sewage pump. Although the water outlet channel is enlarged and liquid reflux is reduced, the probability of clogging the pump due to the collision of larger particles with the impeller is higher. Therefore, how to solve the problem of large particles passing through the sewage pump quickly and reduce the damage caused by clogging the pump is a major issue to be solved at present. Summary of the invention

[0004] In order to solve the above problems, the present invention provides a dry sewage pump, in which a cone sleeve matching mode is designed between the impeller and the rotor, so that the impeller can move up and down in the axial direction of the rotating shaft according to the actual working conditions to pass larger particles of matter, thereby enhancing the sewage discharge capacity, thereby reducing the probability of larger particles clogging the pump and increasing the life of the pump.

[0005] To achieve this purpose, the present invention provides a dry sewage pump, including a motor assembly, an upper bearing assembly, a fan, an upper cover, a lower bearing assembly, an impeller, a fixing bolt, a volute, a water outlet flange, and a water inlet base. The motor assembly includes a rotating shaft, a rotor, a motor housing, and a stator. The fan, the upper bearing assembly, the rotor, the lower bearing assembly, and a mechanical seal are respectively sleeved on the upper end of the rotating shaft from top to bottom and can rotate with the rotating shaft. The upper cover is connected to the motor housing, and the motor housing is connected to the upper end of the lower bearing assembly. The bearing seat support is arranged above the volute, and the lower end is embedded in the interior of the volute. The lower end of the rotating shaft is inserted into the interior of the volute until the lower end of the lower bearing assembly is aligned with the shaft The bearing support is attached and connected, the impeller is installed at the lower end of the shaft through the fixing bolts and is located in the volute, the water outlet flange and the water inlet base are respectively arranged at the periphery and the bottom end of the volute, the lower end of the shaft is conical, the impeller mounting hole is a straight hole design, the sewage pump also includes an impeller cone sleeve and a sealing gasket, the impeller cone sleeve is sleeved on the conical part of the lower end of the shaft, the fixing bolt passes through the sealing gasket and the impeller cone sleeve, and the impeller is fixed on the conical part of the lower end of the shaft, and the impeller cone sleeve is evenly and evenly spaced with expansion locking cuts, so that when the impeller is locked on the conical part of the lower end of the shaft, it can move up and down in the axial direction of the shaft to pass larger particles of matter. The cone sleeve matching design between the impeller and the shaft allows the impeller to match the actual working conditions and move up and down in the axial direction of the shaft to pass larger particles of matter, thereby achieving a strong sewage discharge capacity.

[0006] As a further improvement of the present invention, a cooling exhaust hole is provided on the bearing seat support, and the cooling exhaust hole can guide the water on the outer side of the impeller into the mechanical seal. During the operation of the sewage pump, the water pressure on the outer side of the impeller will be greater than the water pressure on the inner side. The formation of the water pressure difference will cause water to flow into the cooling exhaust hole provided on the bearing seat support to cool the high-speed running mechanical seal. The continuous flow of water will also take away the air originally trapped in the inner cavity of the volute. Exhaust cooling is achieved through the above operation, which increases the life of the mechanical seal and thus increases the life of the entire pump.

[0007] As a further improvement of the present invention, the rotating shaft is designed as an integrated shaft. The coupling design is cancelled and the rotating shaft is now an integral shaft. The shorter rotating shaft design can significantly avoid bearing deflection, thereby extending the service life of the upper bearing assembly and the lower bearing assembly, reducing vibration, maintaining quiet operation, and increasing the reliability of the sewage pump.

[0008] As a further improvement of the present invention, the lower bearing assembly includes a lower bearing seat, the upper end of the lower bearing seat is connected to the lower end of the motor housing, the lower end is connected to the bearing seat support, and a water pipe joint is provided on the lower bearing seat. The water pipe joint is used to drain a small amount of water leaking from the mechanical seal into the lower bearing seat.

[0009] As a further improvement of the present invention, lifting rings are provided on the motor housing and the outer side wall of the lower bearing seat, so as to facilitate lifting the pump and improve installation convenience.

[0010] As a further improvement of the present invention, the upper end of the motor housing and the upper cover, the lower end of the motor housing and the lower bearing seat, and the lower bearing seat and the bearing seat support are all detachably connected to facilitate maintenance.

[0011] A dry sewage pump of the present application has the following beneficial effects:

[0012] 1). Impeller cone sleeve and sealing gasket are used between the impeller and the rotating shaft. The rotating shaft is conical in design, and the impeller mounting hole is a straight hole design with an impeller cone sleeve in the middle. This design allows the impeller to move in the axial direction, allowing larger solid particles to pass through the water pump, thereby achieving excellent dirt passing capacity;

[0013] 2). The shaft has cancelled the coupling design and is now an integral shaft. The shorter shaft design can significantly avoid the deflection of the bearings in contact with it, thereby extending the life of the upper and lower bearing components, reducing vibration, maintaining quiet operation, and increasing the reliability of the sewage pump.

[0014] 3) Design cooling exhaust holes near the mechanical seal, and use the water pressure difference between the inside and outside caused by the operation of the impeller to force water to flow to the mechanical seal to cool it and discharge the air in the volute cavity, which can increase the service life of the mechanical seal, facilitate operation, and no manual exhaust is required.

[0015] In summary, the dry sewage pump of the present application is reasonably designed, the cone sleeve design can exclude larger particles, reduce the chance of pump clogging, and improve the overall sewage discharge capacity of the pump. The integrated shaft design increases the life of the bearing and reduces vibration. The reliability of the sewage pump is enhanced, and the design of the cooling exhaust hole allows the mechanical seal to be cooled while discharging the air in the pump, thereby extending the life of the entire pump. It is very practical and has broad application prospects. BRIEF DESCRIPTION OF THE DRAWINGS

[0016] Attached Figure 1 Is a schematic diagram of the overall structure of the present invention;

[0017] Attached Figure 2 yes Figure 1 A front view of;

[0018] Attached Figure 3 yes Figure 2 AA section view;

[0019] Attached Figure 4 Is a schematic diagram of the structural decomposition of the present invention;

[0020] Attached Figure 5 yes Figure 4 Schematic diagram of the structure of the middle impeller cone sleeve;

[0021] Attached Figure 6 This is a schematic diagram of the water flow direction when the cooling exhaust hole is working;

[0022] Attached Figure 7 yes Figure 1 A top view of;

[0023] Attached Figure 8 yes Figure 1 Bottom view of;

[0024] Attached Fig. 9 It is a schematic diagram of the structure of a sewage pump in the prior art;

[0025] Part name

[0026] 1. Motor assembly; 1-1. Rotating shaft; 1-2. Rotor; 1-3. Motor housing; 1-4. Stator; 2. Upper bearing assembly; 2-1. Upper bearing cover; 2-2. Upper bearing; 2-3. Upper bearing seat; 3. Fan; 4. Upper cover; 5. Lower bearing assembly; 5-1. Lower bearing cover; 5-2. Lower bearing; 5-3. Lower bearing seat; 5-3-1. Water pipe joint; 5-4. Cooling exhaust hole; 6. Mechanical seal ;7. Impeller cone sleeve;7-1. Expansion locking cutout;8. Impeller;8-1. Mounting groove;9. Fixing bolt;10. Volute;11. Cable access port;12-1. Water outlet;13. Water inlet base;13-1. Water inlet;14. First connecting piece;15. Second connecting piece;16. Third connecting piece;17. Sealing gasket;18. Bearing seat support;19. Lifting ring;20. Impeller cavity;21. Spacer tongue. DETAILED DESCRIPTION

[0027] The present invention is further described in detail below in conjunction with the accompanying drawings and specific embodiments:

[0028] like Figure 1-8As shown, a dry sewage pump provided by the present invention includes a motor assembly 1, an upper bearing assembly 2, a fan 3, an upper cover 4, a lower bearing assembly 5, an impeller 8, a fixing bolt 9, a volute 10, a water outlet flange 12, and a water inlet base 13. The motor assembly 1 includes a rotating shaft 1-1, a rotor 1-2, a motor housing 1-3, and a stator 1-4. The upper bearing assembly 2 includes an upper bearing cover 2-1, an upper bearing 2-2, and an upper bearing seat 2-3. The upper bearing 2-2 is installed on the upper bearing seat 2-3. The upper bearing cover 2-1 is detachably connected to the upper bearing seat 2-3. Similarly, the lower bearing assembly 5 includes a lower bearing cover 5-1, a lower bearing 5-2, and a lower bearing seat 5-3, and the installation method is the same as that of the upper bearing assembly 2. The fan 3, the upper bearing assembly 2, the rotor 1-2, the lower bearing assembly 5, and the mechanical seal 6 are respectively sleeved on the upper end of the rotating shaft 1-1 from top to bottom until the upper bearing 2-2 and the lower bearing 5-2 are in contact with the rotating shaft 1-1 and can rotate with the rotating shaft 1-1. The mechanical seal 6 seals the lower bearing seat 5-3 and the rotating shaft 1-1 to prevent water in the impeller chamber 20 formed between the volute 10 and the impeller 8 from flowing into the lower bearing In the seat 5-3, the upper cover 4 is connected to the upper end of the motor housing 1-3 by a first connecting piece 14, and the lower end of the motor housing 1-3 is connected to the upper end of the lower bearing seat 5-3 by a second connecting piece 15. The bearing seat support 18 is arranged above the volute 10, and the lower end is embedded in the volute 10. The lower end of the rotating shaft 1-1 is inserted into the volute 10 until the lower end of the lower bearing seat 5-3 is attached to the bearing seat support 18 and connected by a third connecting piece 16. The impeller 8 is installed at the lower end of the rotating shaft 1-1 through the fixing bolts 9 and is located in the volute 10. The water outlet flange 1 2 and water inlet base 13 are respectively arranged at the periphery and bottom of the volute 10, the lower end of the rotating shaft 1-1 is conical, the impeller 8 mounting hole is designed as a straight hole, the sewage pump also includes an impeller cone sleeve 7 and a sealing gasket 17, the impeller cone sleeve 7 is sleeved on the conical part of the lower end of the rotating shaft 1-1, the fixing bolt 9 passes through the sealing gasket 17 and the impeller cone sleeve 7, and the impeller 8 is fixed on the conical part of the lower end of the rotating shaft 1-1, and the impeller cone sleeve 7 is evenly and evenly spaced with expansion locking cuts 7-1, so that when the impeller 8 is locked on the conical part of the lower end of the rotating shaft 1-1, it can move up and down in the axial direction of the rotating shaft 1-1 to pass larger particles of matter. The cone sleeve matching design between the impeller and the rotating shaft allows the impeller to match the actual working conditions and move up and down in the axial direction of the rotating shaft to pass larger particles of matter, thereby achieving a strong sewage discharge capacity.

[0029] The bearing support 18 is provided with mechanical seal cooling exhaust holes 5-4 (such as Figure 6As shown in the figure, the cooling exhaust hole 5-4 can guide the water on the outside of the impeller 8 into the mechanical seal 6 through the action of the impeller back blades. In the prior art, after the sewage pump is installed, the air entering from the water inlet 13-1 of the water inlet base 13 gathers in the inner cavity of the bearing seat support 18, that is, the impeller cavity 20, and the water cannot reach the mechanical seal 6. After the pump is running, the mechanical seal 6 is dry rubbed, so high temperature is generated to damage the sewage pump. After the cooling exhaust hole 5-4 is opened on the bearing seat support 18, the water pressure on the outside of the impeller will be greater than the water pressure on the inside, and the formation of the water pressure difference will cause water to flow into the cooling exhaust hole 5-4. Figure 6 The dotted arrow in the figure shows the direction of water flow until the inner cavity of the bearing support 18, i.e., the impeller cavity 20, is filled with water, so that the high-speed mechanical seal 6 can be cooled. The continuous flow of water will also take away all the air originally trapped in the inner cavity of the volute 10. Through the above operation, exhaust cooling is achieved, which increases the life of the mechanical seal and thus increases the life of the entire pump. The design position and shape of the cooling exhaust hole are not limited, as long as the water flow can be directed to the vicinity of the mechanical seal 6 to cool it.

[0030] The rotating shaft 1-1 is an integrated design. The coupling design is cancelled for the rotating shaft 1-1, which is now an integral shaft. The shorter rotating shaft design can significantly avoid bearing deflection, thereby extending the service life of the upper bearing assembly 2 and the lower bearing assembly 5, reducing vibration, maintaining quiet operation, and increasing the reliability of the sewage pump.

[0031] The lower bearing seat 5-3 is provided with a water pipe joint 5-3-1, which is used to vent a small amount of water leaking from the mechanical seal 6 into the lower bearing seat 5-3.

[0032] The motor housing 1-3 and the outer side wall of the lower bearing seat 5-3 are both provided with lifting rings 19. It is convenient to lift the pump and improve the convenience of installation.

[0033] A dry sewage pump of the present application has the following beneficial effects:

[0034] 1). Impeller cone sleeve 7 and sealing gasket 17 are used between impeller 8 and shaft 1-1. Shaft 1-1 is conical in design, and the installation hole of impeller 8 is straight in design. Impeller cone sleeve 7 is added in the middle. Such design enables impeller 8 to move in the axial direction, allowing larger solid particles to pass through the water pump, thereby achieving excellent dirt passing capacity;

[0035] 2). The coupling design of the rotating shaft 1-1 has been cancelled. It is now an integral shaft. The shorter rotating shaft design can significantly avoid the deflection of the bearings in contact with it, thereby extending the life of the upper and lower bearing components, reducing vibration, maintaining quiet operation, and increasing the reliability of the sewage pump.

[0036] 3) Design cooling exhaust holes 5-4 near the mechanical seal 6, and use the water pressure difference between the inside and outside caused by the operation of the impeller 8 to promote water flow to the mechanical seal 6 to cool it, and discharge the air in the inner cavity of the volute 10, which can increase the service life of the mechanical seal 6, is easy to operate, and does not require manual exhaust.

[0037] In summary, the dry sewage pump of the present application is reasonably designed, the cone sleeve design can exclude larger particles, reduce the chance of pump clogging, and improve the overall sewage discharge capacity of the pump. The integrated shaft design increases the life of the bearing and reduces vibration. The reliability of the sewage pump is enhanced, and the design of the cooling exhaust hole allows the mechanical seal to be cooled while discharging the air in the pump, thereby extending the life of the entire pump. It is very practical and has broad application prospects.

[0038] The above description is only a preferred embodiment of the present invention and does not constitute any other form of limitation to the present invention. Any modification or equivalent change made based on the technical essence of the present invention still falls within the scope of protection required by the present invention.

Claims

1. A dry sewage pump, comprising a motor assembly (1), an upper bearing assembly (2), a fan (3), an upper cover (4), a lower bearing assembly (5), an impeller (8), a fixing bolt (9), a volute (10), a water outlet flange (12), and a water inlet base (13), wherein the motor assembly (1) comprises a rotating shaft (1-1), a rotor (1-2), a motor housing (1-3), and a stator (1-4), wherein the fan (3), the upper bearing assembly (2), the rotor (1-2), the lower bearing assembly (5), and a mechanical seal (6) are respectively sleeved on the upper end of the rotating shaft (1-1) from top to bottom and can rotate with the rotating shaft (1-1), and the upper cover (4) The motor housing (1-3) is connected to the motor housing (1-3), the motor housing (1-3) is connected to the upper end of the lower bearing assembly (5), the bearing seat support (18) is arranged above the volute (10), and the lower end is embedded in the volute (10), the lower end of the rotating shaft (1-1) is inserted into the volute (10) until the lower end of the lower bearing assembly (5) is attached to and connected with the bearing seat support (18), the impeller (8) is installed on the lower end of the rotating shaft (1-1) through the fixing bolts (9), and is located in the volute (10), the water outlet flange (12) and the water inlet base (13) are respectively arranged on the periphery and the bottom end of the volute (10), characterized in that: The lower end of the rotating shaft (1-1) is tapered, and the mounting hole of the impeller (8) is designed as a straight hole. The sewage pump also includes an impeller cone sleeve (7) and a sealing gasket (17). The impeller cone sleeve (7) is sleeved on the cone portion at the lower end of the rotating shaft (1-1). After the fixing bolt (9) passes through the sealing gasket (17) and the impeller cone sleeve (7), the impeller (8) is fixed to the cone portion at the lower end of the rotating shaft (1-1). The impeller cone sleeve (7) is provided with expansion locking cutouts (7-1) at even intervals, so that when the impeller (8) is locked on the cone portion at the lower end of the rotating shaft (1-1), it moves up and down in the axial direction of the rotating shaft (1-1) so as to pass larger particles of matter. The bearing seat support (18) is provided with a cooling exhaust hole (5-4), and the cooling exhaust hole (5-4) can guide water outside the impeller (8) into the mechanical seal (6); The rotating shaft (1-1) is of integrated design.

2. A dry sewage pump according to claim 1, characterized in that: The lower bearing assembly (5) comprises a lower bearing seat (5-3), the upper end of the lower bearing seat (5-3) is connected to the lower end of the motor housing (1-3), and the lower end is connected to the bearing seat support (18), and a water pipe joint (5-3-1) is provided on the lower bearing seat (5-3).

3. A dry sewage pump according to claim 2, characterized in that: Lifting rings (19) are provided on the outer side walls of the motor housing (1-3) and the lower bearing seat (5-3).

4. A dry sewage pump according to claim 3, characterized in that: The upper end of the motor housing (1-3) and the upper cover (4), the lower end of the motor housing (1-3) and the lower bearing seat (5-3), and the lower bearing seat (5-3) and the bearing seat support (18) are all connected in a detachable manner.

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