A side suction centrifugal pump

Abstract

The utility model relates to a side suction type centrifugal pump, the radial hole for producing the suction force when the runner rotates is set up along the radial of runner on runner, still through the male ring of the female ring in the liquid seal cover ring and the female ring of runner cover connection, form rotatable, when the dynamic closed structure of the dynamic sealing of fluid is carried out in the side suction type centrifugal pump work, the inner chamber of the seal part storage liquid chamber is negative pressure area, the air of outside will leak into the pump chamber, and the machine seal of the utility model can prevent air leak and liquid leak out. The utility model has the advantages that: avoid the big particle slurry to enter the runner radial hole channel, prevent the runner hole from being blocked, the shaft sealing position pressure is low, the vacuum degree is high, can bear the fluid pressure of pump machine inlet 0.1MPa within, and under the premise of setting the wind wheel, the shaft seal (machine seal) used can radiate heat without external cooling water, is safe in operation, and has long service life, under the condition that the inlet fluid pressure is 0.06MPa, can improve the service life of shaft seal (machine seal) 3-4 times.

Description

Technical Field

[0001] This utility model belongs to the field of shaft sealing technology for centrifugal pumps, and particularly relates to a side-suction centrifugal pump. Background Technology

[0002] Corrosion-resistant centrifugal slurry pumps are commonly used material conveying pumps in the chemical and metallurgical industries. Corrosion-resistant centrifugal slurry pumps can be classified by structure into front-suction type, rear-suction type, and vertical type, etc. They can also be classified by the material of the flow-through components into metal type, plastic type, and ceramic type, etc.

[0003] Existing anti-corrosion centrifugal slurry pumps all rely on a rotating shaft to drive an impeller to rotate, generating centrifugal force and thus conveying force. However, when the main shaft is rotating, existing anti-corrosion centrifugal slurry pumps are unable to achieve leak prevention, corrosion protection, and temperature resistance for the shaft seal under the pressure of the fluid and the scouring of particles.

[0004] In traditional slurry pump shaft seal technology, whether it is a mechanical seal with a driving ring and a stationary ring or a shaft seal with a rubber sealing ring, external cooling water is required to cool or flush the mechanical seal. However, this leads to many problems: for example, water supply and drainage pipelines need to be set up, and cooling water needs to be collected and treated. This not only wastes water resources but also increases operating costs.

[0005] To address the shortcomings of traditional shaft seal technologies that require cooling water, the inventor disclosed a side-suction centrifugal pump that can normally transport corrosive slurries without external cooling water, in patent application CN202221702582.4 filed on July 4, 2022. Figure 1 As shown, the shaft sealing principle of the centrifugal pump in this patent is as follows: the pump sealing part is equipped with a threaded shaft sleeve, a threaded sleeve 1.1, a sand-blocking rubber sealing ring 1.2, a driving ring 1.3.1 and a stationary ring 1.3.2, a mechanical seal 1.3, and a fan 1.4; when the pump in this patent is working: the main shaft drives the threaded shaft sleeve to rotate, and the threaded shaft sleeve generates a suction force in the threaded sleeve, which draws the cavity of the shaft sealing part into a vacuum state, so that the rubber sealing ring can block and seal the slurry in the pump cavity under no fluid pressure. The mechanical seal operates in the vacuum air, and the heat generated by the mechanical seal is dissipated by the air generated by the fan on the main shaft, so that the mechanical seal can operate normally without external cooling water.

[0006] However, after several years of actual manufacturing and production, the inventors discovered that although the centrifugal pump shaft seal described in the patent application number CN202221702582.4 can operate normally without external cooling water, it still has the following defects: When the fluid pressure at the pump inlet exceeds 0.04MPa, the suction force generated by the threaded bushing is insufficient to create a vacuum at the rubber sealing ring of the mechanical seal, causing the air or fluid pressure at the shaft seal to exceed 0.01MPa, making it impossible to generate negative pressure; when the fluid or air at the sealing point is at a positive pressure value above 0.01MPa, the lip seal and the mechanical seal will be damaged, resulting in a shortened service life of the mechanical seal to about one month; especially in the case of conveying slurry in a high-level tank at the pump, the vacuum degree in the pump shaft seal cannot meet the requirements for safe operation of the pump.

[0007] In the prior art, there are also centrifugal slurry pumps that transport slurry: they are equipped with an auxiliary impeller for depressurizing the fluid in the shaft seal and thus protecting the shaft seal of the centrifugal pump. In the method of depressurizing the mechanical seal of the pump by opening a suction hole on the impeller auxiliary plate, the following disadvantages exist when the suction hole is located at the position of the impeller auxiliary plate: (1) Only an open impeller structure can be used, and a closed flow channel structure cannot be used; (2) Due to the large fluid circulation volume at the position of the auxiliary impeller, the closed flow channel is very easy to be blocked, especially when the pump is transporting thick slurry, the flow channel of the auxiliary impeller is more likely to be blocked; (3) The auxiliary impeller with open blades has a large fluid circulation volume and high power consumption, consuming 10-15% of the power consumption of the pump, and the energy efficiency ratio is very poor; (4) The axial installation requirements of the open auxiliary impeller blades are very high. The distance between the blades and the pump casing can only be controlled within 1-2 mm. If the distance is too large, the centrifugal suction function of the auxiliary blades will be lost.

[0008] In summary, it is particularly important to design a centrifugal pump that can prevent air leakage and liquid leakage. Utility Model Content

[0009] The purpose of this invention is to overcome the shortcomings of the existing technology and provide a side-suction centrifugal pump.

[0010] This side-suction centrifugal pump includes a pump casing, pump cover, pump shaft, bearing housing, bearing, bearing side cover, mounting base, coupling, motor, impeller, fan wheel, mechanical seal, sealing ring mounting box, suction tee, and lip-shaped rubber seal. The mechanical seal includes a dynamic ring and a stationary ring. The pump shaft is fitted with a first part and a second part of the shaft sleeve in sections. A rotor is located on the pump shaft on one side of the lip-shaped rubber seal, and the rotor is clamped and fixed to the pump shaft by the first part and the second part of the shaft sleeve. The impeller can rotate with the rotation of the pump's main shaft; radial holes are opened on the impeller along the radial direction of the impeller to generate suction force when the impeller rotates; a convex ring is provided on the impeller near the mechanical seal side; a sealing ring is fixedly connected to the suction inlet tee on the outer side of the convex ring; the inner concave ring of the sealing ring is fitted and connected to the convex ring of the impeller; the outer circumferential surface of the convex ring and the inner circumferential surface of the inner concave ring of the sealing ring fit together to form a rotatable, dynamically sealed structure that dynamically seals the fluid when the side-suction centrifugal pump is working;

[0011] The impeller, the sealing ring, and the lip seal together form a relatively closed and vacuum-sealed liquid storage chamber. This chamber stores the suction force generated during impeller operation and transmits it to the lip of the lip seal. This reduces the tightness between the lip of the lip seal and the first part of the bushing, and decreases friction, thus extending the service life of the lip seal. Under the suction force generated by the impeller's rotation, the fluid in the liquid storage chamber is kept at a stable level. Under a certain negative pressure state, the friction between the lip of the lip rubber seal and the bushing is reduced, extending the service life of the lip rubber seal and thus extending the service life of the mechanical seal. The radial hole is connected to the liquid storage chamber of the sealing part of the sealing ring. The function of the radial hole on the impeller is that when the impeller rotates, the centrifugal force generated by the rotation of the impeller will generate a suction force at the radial hole, thereby drawing the liquid in the liquid storage chamber of the sealing part into a negative pressure state. The setting of the radial hole allows the fluid in the pump chamber to flow back into the liquid storage chamber to cool the lip rubber seal.

[0012] One side of the sealing ring is provided with a liquid passage hole that limits the amount of fluid in the pump chamber to enter the liquid storage chamber of the sealing part. The liquid passage hole is connected to the liquid storage chamber of the sealing part. The fluid entering the liquid storage chamber of the sealing part plays the role of cooling or flushing components such as the lip rubber seal ring, the first part of the bushing and the second part of the bushing.

[0013] An annular groove is also provided on the rotor along a radial direction perpendicular to the rotor. One end of the annular groove is connected to the radial hole, and the other end is connected to the liquid storage chamber of the sealing part.

[0014] The impeller is equipped with multiple reflux holes along the axial direction of the pump's main shaft. These reflux holes are used to introduce material to cool the rubber seals and bushings. The reflux holes on the impeller are connected to annular grooves. The annular grooves facilitate the manufacture of the impeller and precisely connect the radial holes of the impeller with the reflux holes.

[0015] As a preferred option: one end of the sealing ring is tightly and fixedly connected to the suction tee of the side-suction centrifugal pump; the impeller is installed on the pump main shaft through the fitting of the convex ring and the sealing ring, which has no requirements on axial position, is easy to install, and can generate negative pressure well.

[0016] Preferably, the number of fluid passage holes is 1 to 3; the diameter of the fluid passage holes is 4 to 10 mm; the number of radial holes is 4 to 20 (the higher the inlet fluid pressure, the more radial holes there are, and vice versa), and the diameter of the radial holes can be determined according to the size of the pump model, with a diameter of 4 to 12 mm; the radial clearance between the inner concave ring of the sealing ring and the convex ring of the impeller is 0.5 to 1.5 mm; the diameter of the impeller is determined according to the inlet fluid pressure of the side-suction centrifugal pump, the lower the fluid pressure, the smaller the impeller diameter, and vice versa: when the inlet fluid pressure is 0.01 to 0.04 MPa, the impeller diameter is 90 to 110 mm; when the inlet fluid pressure of the side-suction centrifugal pump is 0.05 to 0.08 MPa, the impeller diameter is 110 to 130 mm; the higher the inlet fluid pressure of the side-suction centrifugal pump, the larger the outer diameter of the impeller needs to be.

[0017] As a preferred option, the flow rate of the side-suction centrifugal pump is 20–100 m³ / h. 3 For flow rates of 300–500 m³ / h, a radial orifice with a diameter of 4–6 mm should be selected; for side-suction centrifugal pumps, the flow rate is 300–500 m³ / h. 3 When the speed is / h, a radial hole with a diameter of 10 to 12 mm should be selected.

[0018] As a preferred option, the side-suction centrifugal pump can be a vertical centrifugal pump, a horizontal side-suction centrifugal pump, or a multi-stage side-suction centrifugal pump.

[0019] As a preferred option, when the side-suction centrifugal pump is a vertical centrifugal pump, a liquid storage pan is provided on the suction tee at the position of the mechanical seal dynamic ring and mechanical seal stationary ring. The liquid storage pan is filled with grease, which can lubricate the mechanical seal dynamic ring and mechanical seal stationary ring to reduce the friction between them. This allows the shaft seal of the side-suction centrifugal pump to have a longer service life without the need for cooling water, thereby improving the anti-air breaker performance of the vertical side-suction centrifugal pump.

[0020] Preferably, the mechanical seal, which has a rotating mechanical seal ring and a stationary mechanical seal ring, is located outside the lip seal ring; the seal ring is installed in the radial direction of the lip seal ring and is located outside the lip seal ring.

[0021] As a preferred embodiment, the convex ring is a circular convex ring provided on the side of the rotor near the mechanical seal.

[0022] As a preferred option, the pump casing, impeller, pump cover, and suction tee are all made of steel lined with plastic, and their manufacturing method is the same as that of plastic-lined centrifugal pumps in the industry.

[0023] As a preferred option, the impeller is a two-piece type, and the radial hole is formed by clamping the two plates together.

[0024] The beneficial effects of this utility model are:

[0025] A rotor is provided on the main shaft of the pump on one side of the lip-shaped rubber seal ring. A radial hole is opened on the rotor along the radial direction of the rotor to generate suction force when the rotor rotates. It is also connected to the inner concave ring of the sealing sleeve ring and the convex ring of the rotor through the sealing sleeve ring to form a rotatable dynamic sealing structure that dynamically seals the fluid when the side-suction centrifugal pump is working.

[0026] The impeller, the sealing ring, and the lip rubber seal together form a relatively closed and vacuum-sealed liquid storage chamber. The inner cavity of the liquid storage chamber is a negative pressure zone, and outside air will leak into the pump chamber. However, the mechanical seal of this invention can prevent air leakage and liquid leakage.

[0027] The gap between the sealing ring and the convex ring of the impeller is 0.5 to 1.5 mm, which prevents large particles of slurry from entering the radial hole of the impeller and prevents the impeller hole from becoming blocked.

[0028] The side-suction centrifugal pump designed in this utility model has low pressure and high vacuum at the shaft seal, and can withstand fluid pressure within 0.1MPa at the pump inlet. Moreover, with the impeller installed, the shaft seal (mechanical seal) can dissipate heat without external cooling water, ensuring safe operation and long service life. It can also withstand short-term evacuation (evacuation refers to pump start-up without material entering the pump body). When the inlet fluid pressure is 0.06MPa, the service life of the shaft seal (mechanical seal) can be increased by 3 to 4 times. Attached Figure Description

[0029] Figure 1 This is a schematic diagram of the shaft seal of a centrifugal pump in the prior art;

[0030] Figure 2 This is a schematic diagram of the side-suction centrifugal pump of this utility model;

[0031] Figure 3 for Figure 2 A magnified view of a portion of the image;

[0032] Figure 4 A three-dimensional view of the rotating wheel;

[0033] Figure 5This is a side sectional view of the rotor;

[0034] Figure 6 This is a top view of the rotating wheel;

[0035] Figure 7 This is a cross-sectional view of a two-piece rotary structure;

[0036] Figure 8 This is a cross-sectional view of a vertical side-suction centrifugal pump.

[0037] Explanation of reference numerals in the attached drawings: 1. Pump main shaft; 1.1. Threaded sleeve; 1.2. Sand-blocking rubber seal ring; 1.3. Mechanical seal; 1.3.1. Dynamic ring; 1.3.2. Stationary ring; 1.4. Impeller; 2. Bearing housing; 2.0. Vertical centrifugal pump; 2.1. Suction tee; 2.2. Liquid collection tray; 3. Bearing; 4. Bearing side cover; 5. Impeller; 6. Mechanical seal; 6.1. Dynamic ring of mechanical seal; 6.2. Stationary ring of mechanical seal; 7. Seal ring mounting box; 8. Lip seal. Partial section of the ring 8.1, lip of the lip-shaped rubber seal ring 8.2, first part of the bushing 10, sealing ring 11, inner concave ring of the sealing ring 11.1, liquid passage hole 11.2, liquid storage cavity of the sealing part 11.3, impeller 12, convex ring 12.1, radial hole 12.2, annular groove 12.3, return hole 12.4, second part of the bushing 13, pump cover 14, impeller 15, pump casing 16, mounting base 17, coupling 18, motor 19. Detailed Implementation

[0038] The present invention will be further described below with reference to embodiments. The description of the embodiments below is only for the purpose of helping to understand the present invention. It should be noted that, for those skilled in the art, several modifications can be made to the present invention without departing from the principle of the present invention, and these improvements and modifications also fall within the protection scope of the claims of the present invention.

[0039] Example 1

[0040] like Figures 2 to 8As shown, a vertical side-suction centrifugal pump, which is a single-stage side-suction centrifugal pump, includes a pump casing 16, a pump cover 14, a pump main shaft 1, a bearing housing 2, a bearing 3, a bearing side cover 4, a mounting base 17, a coupling 18, a motor 19, an impeller 15, a fan wheel 5, a mechanical seal 6, a sealing ring mounting box 7, a suction inlet tee 2.1, and a lip-shaped rubber seal 8. The mechanical seal 6 includes a dynamic ring 6.1 and a stationary ring 6.2. The pump main shaft 1 is segmented with a first part 10 and a second part 13 of a bushing. A rotor 12 is provided on the pump main shaft 1 on one side of the lip-shaped rubber seal 8. The rotor 12 is clamped and fixed to the pump main shaft 1 by the first part 10 and the second part 13 of the bushing. The rotor 12 can rotate with the rotation of the pump main shaft 1. The rotor 12 has four holes with a diameter of 6mm along the radial direction of the rotor 12 to generate suction force when the rotor rotates. A convex ring 12.1 is provided on the impeller 12 near the mechanical seal 6 via the bore 12.2. A sealing sleeve 11 is fixedly connected to the suction tee 2.1 on the outer side of the convex ring 12.1. One end of the sealing sleeve 11 is tightly and fixedly connected to the suction tee 2.1 of the side-suction centrifugal pump. The impeller 12 is mounted on the pump main shaft 1 through the fitting of the convex ring 12.1 and the sealing sleeve 11. There are no requirements for axial position, it is easy to install, and it can generate negative pressure well. The sealing ring 11 has an inner concave ring 11.1 that fits into the convex ring 12.1 of the impeller 12. The outer circumferential surface of the convex ring 12.1 fits into the inner circumferential surface of the inner concave ring 11.1 of the sealing ring to form a rotatable, dynamically sealed structure that dynamically seals the fluid when the side-suction centrifugal pump is working. The radial clearance between the inner concave ring 11.1 of the sealing ring 11 and the convex ring 12.1 of the impeller 12 is 0.5 mm.

[0041] The diameter of the impeller is determined by the inlet fluid pressure of the side-suction centrifugal pump. The lower the fluid pressure, the smaller the impeller diameter, and vice versa. When the inlet fluid pressure is between 0.01 and 0.04 MPa, the diameter of impeller 12 is 90 mm; when the inlet fluid pressure is between 0.05 and 0.08 MPa, the diameter of impeller 12 is 110 mm. The higher the inlet fluid pressure of the side-suction centrifugal pump, the larger the outer diameter of the impeller needs to be.

[0042] A portion of the impeller 12, a portion of the sealing ring 11, and a portion of the lip rubber seal 8.1 together form a relatively closed and vacuum-sealed liquid storage chamber 11.3. The liquid storage chamber 11.3 stores the suction force generated when the impeller 12 rotates and transmits this suction force to the lip 8.2 of the lip rubber seal, thereby reducing the tightness between the lip of the lip rubber seal and the first part of the bushing and reducing friction, thus extending the service life of the lip rubber seal. Under the suction force generated when the impeller rotates, the fluid in the liquid storage chamber is initially drawn into the chamber... The system maintains a stable negative pressure state, thereby reducing the friction between the lip of the lip rubber seal and the bushing, extending the service life of the lip rubber seal, and thus extending the service life of the mechanical seal. The radial hole 12.2 is connected to the liquid storage chamber 11.3 of the sealing part of the sealing ring 11. The function of the radial hole on the impeller is that when the impeller rotates, the centrifugal force generated by the rotation of the impeller will generate a suction force at the radial hole, thereby drawing the liquid in the liquid storage chamber of the sealing part into a negative pressure state. The setting of the radial hole allows the fluid in the pump chamber to flow back into the liquid storage chamber to cool the lip rubber seal.

[0043] One side of the sealing ring 11 has a 4mm diameter through hole 11.2 to limit the amount of fluid in the pump chamber to enter the liquid storage chamber of the sealing part. The through hole 11.2 is connected to the liquid storage chamber 11.3 of the sealing part. The fluid entering the liquid storage chamber of the sealing part plays the role of cooling or flushing components such as the lip rubber seal, the first part of the bushing and the second part of the bushing.

[0044] An annular groove 12.3 is also provided on the rotating wheel 12 in a radial direction perpendicular to the rotating wheel 12. One end of the annular groove 12.3 is connected to the radial hole 12.2, and the other end is connected to the liquid storage chamber 11.3 of the sealing part.

[0045] The impeller 12 is also provided with multiple return holes 12.4 along the axial direction of the pump main shaft 1. The return holes are used to introduce materials to cool the rubber sealing ring and the bushing. The setting of the annular groove facilitates the manufacturing of the impeller. The annular groove precisely connects the radial hole of the impeller with the return hole. The return hole 12.4 on the impeller 12 is connected to the annular groove 12.3.

[0046] The impeller 5 is located on one side of the mechanical seal dynamic ring 6.1; the mechanical seal 6, which has a mechanical seal dynamic ring 6.1 and a mechanical seal stationary ring 6.2, is located on the outside of the lip rubber seal ring 8; the seal ring mounting box 7 is located in the radial direction of the lip rubber seal ring 8 and is located on the outside of the lip rubber seal ring 8; the convex ring 12.1 is a circular convex ring provided on the impeller 12 near the mechanical seal 6.

[0047] The flow parts of the centrifugal pump are made of plastic; the pump casing 16, impeller 15, pump cover 14 and suction tee 2.1 are all steel-lined plastic structures, and their manufacturing method is the same as that of plastic-lined centrifugal pumps in the industry.

[0048] The rotor 12 is a two-piece type, and the radial hole 12.2 is formed by clamping the two plates together;

[0049] At the positions of the mechanical seal dynamic ring 6.1 and mechanical seal stationary ring 6.2 of the mechanical seal 6, a liquid storage pan 2.2 is provided on the suction tee 2.1. The liquid storage pan 2.2 is filled with grease. The grease in the liquid storage pan can lubricate the mechanical seal dynamic ring and mechanical seal stationary ring to reduce the friction between them. This makes the shaft seal of the side-suction centrifugal pump have a longer service life without the need for cooling water, thereby improving the anti-air breakage performance of the vertical side-suction centrifugal pump.

[0050] Example 2

[0051] A horizontal side-suction centrifugal pump, a single-stage side-suction centrifugal pump, includes a pump casing 16, a pump cover 14, a pump shaft 1, a bearing housing 2, a bearing 3, a bearing side cover 4, a mounting base 17, a coupling 18, a motor 19, an impeller 15, a fan wheel 5, a mechanical seal 6, a sealing ring mounting box 7, a suction tee 2.1, and a lip-shaped rubber seal 8. The mechanical seal 6 includes a dynamic ring 6.1 and a stationary ring 6.2. The pump shaft 1 is segmented with a first part 10 and a second part 13 of a bushing. A rotor 12 is provided on the pump shaft 1 on one side of the lip-shaped rubber seal 8. The rotor 12 is clamped and fixed to the pump shaft 1 by the first part 10 and the second part 13 of the bushing, and the rotor 12 can rotate with the rotation of the pump shaft 1. The rotor 12 has 20 holes with a diameter of 12mm along the radial direction of the rotor 12 to generate suction force when the rotor rotates. Hole 12.2, a convex ring 12.1 is provided on the impeller 12 near the mechanical seal 6. A sealing sleeve 11 is fixedly connected to the suction tee 2.1 on the outer side of the convex ring 12.1. One end of the sealing sleeve 11 is tightly connected to the suction tee 2.1 of the side-suction centrifugal pump. The impeller 12 is installed on the pump main shaft 1 through the fitting of the convex ring 12.1 and the sealing sleeve 11. There are no requirements for axial position, it is easy to install, and it can generate negative pressure well. The sealing ring 11 has an inner concave ring 11.1 that fits into the convex ring 12.1 of the impeller 12. The outer circumferential surface of the convex ring 12.1 fits into the inner circumferential surface of the inner concave ring 11.1 of the sealing ring to form a rotatable, dynamically sealed structure that dynamically seals the fluid when the side-suction centrifugal pump is working. The radial clearance between the inner concave ring 11.1 of the sealing ring 11 and the convex ring 12.1 of the impeller 12 is 1.5 mm.

[0052] The diameter of the impeller is determined by the inlet fluid pressure of the side-suction centrifugal pump. The lower the fluid pressure, the smaller the impeller diameter, and vice versa. When the inlet fluid pressure is between 0.01 and 0.04 MPa, the diameter of impeller 12 is 110 mm; when the inlet fluid pressure is between 0.05 and 0.08 MPa, the diameter of impeller 12 is 130 mm; the higher the inlet fluid pressure of the side-suction centrifugal pump, the larger the outer diameter of the impeller needs to be.

[0053] A portion of the impeller 12, a portion of the sealing ring 11, and a portion of the lip rubber seal 8.1 together form a relatively closed and vacuum-sealed liquid storage chamber 11.3. The liquid storage chamber 11.3 stores the suction force generated when the impeller 12 rotates and transmits this suction force to the lip 8.2 of the lip rubber seal, thereby reducing the tightness between the lip of the lip rubber seal and the first part of the bushing and reducing friction, thus extending the service life of the lip rubber seal. Under the suction force generated when the impeller rotates, the fluid in the liquid storage chamber is initially drawn into the chamber... The system maintains a stable negative pressure state, thereby reducing the friction between the lip of the lip rubber seal and the bushing, extending the service life of the lip rubber seal, and thus extending the service life of the mechanical seal. The radial hole 12.2 is connected to the liquid storage chamber 11.3 of the sealing part of the sealing ring 11. The function of the radial hole on the impeller is that when the impeller rotates, the centrifugal force generated by the rotation of the impeller will generate a suction force at the radial hole, thereby drawing the liquid in the liquid storage chamber of the sealing part into a negative pressure state. The setting of the radial hole allows the fluid in the pump chamber to flow back into the liquid storage chamber to cool the lip rubber seal.

[0054] The sealing sleeve 11 has three 10mm diameter through holes 11.2 on one side to limit the amount of fluid in the pump chamber to enter the liquid storage chamber of the sealing part. The through holes 11.2 are connected to the liquid storage chamber 11.3 of the sealing part. The fluid entering the liquid storage chamber of the sealing part plays the role of cooling or flushing components such as the lip rubber seal, the first part of the bushing and the second part of the bushing.

[0055] An annular groove 12.3 is also provided on the rotating wheel 12 in a radial direction perpendicular to the rotating wheel 12. One end of the annular groove 12.3 is connected to the radial hole 12.2, and the other end is connected to the liquid storage chamber 11.3 of the sealing part.

[0056] The impeller 12 is also provided with multiple return holes 12.4 along the axial direction of the pump main shaft 1. The return holes are used to introduce materials to cool the rubber sealing ring and the bushing. The setting of the annular groove facilitates the manufacturing of the impeller. The annular groove precisely connects the radial hole of the impeller with the return hole. The return hole 12.4 on the impeller 12 is connected to the annular groove 12.3.

[0057] The impeller 5 is located on one side of the mechanical seal dynamic ring 6.1; the mechanical seal 6, which has a mechanical seal dynamic ring 6.1 and a mechanical seal stationary ring 6.2, is located on the outside of the lip rubber seal ring 8; the seal ring mounting box 7 is located in the radial direction of the lip rubber seal ring 8 and is located on the outside of the lip rubber seal ring 8; the convex ring 12.1 is a circular convex ring provided on the impeller 12 near the mechanical seal 6.

[0058] The centrifugal pump's flow-through components are made of ceramic; the pump casing 16, impeller 15, pump cover 14, and suction tee 2.1 are all steel-lined plastic structures, and their manufacturing method is the same as that of plastic-lined centrifugal pumps in the industry.

[0059] The rotor 12 is a two-piece type, and the radial hole 12.2 is formed by clamping the two plates together;

[0060] At the positions of the mechanical seal dynamic ring 6.1 and mechanical seal stationary ring 6.2 of the mechanical seal 6, a liquid storage pan 2.2 is provided on the suction tee 2.1. The liquid storage pan 2.2 is filled with grease. The grease in the liquid storage pan can lubricate the mechanical seal dynamic ring and mechanical seal stationary ring to reduce the friction between them. This makes the shaft seal of the side-suction centrifugal pump have a longer service life without the need for cooling water, thereby improving the anti-air breakage performance of the vertical side-suction centrifugal pump.

[0061] Example 3

[0062] A vertical side-suction centrifugal pump, which is a multi-stage side-suction centrifugal pump, includes a pump casing 16, a pump cover 14, a pump main shaft 1, a bearing housing 2, a bearing 3, a bearing side cover 4, a mounting base 17, a coupling 18, a motor 19, an impeller 15, a fan wheel 5, a mechanical seal 6, a sealing ring mounting box 7, a suction inlet tee 2.1, and a lip-shaped rubber seal 8. The mechanical seal 6 includes a dynamic ring 6.1 and a stationary ring 6.2. The pump main shaft 1 is segmented with a first part 10 and a second part 13 of a bushing. A rotor 12 is provided on the pump main shaft 1 on one side of the lip-shaped rubber seal 8. The rotor 12 is clamped and fixed to the pump main shaft 1 by the first part 10 and the second part 13 of the bushing. The rotor 12 can rotate with the rotation of the pump main shaft 1. Ten holes with a diameter of 6mm are opened on the rotor 12 in the radial direction to generate suction force when the rotor rotates. Hole 12.2, a convex ring 12.1 is provided on the impeller 12 near the mechanical seal 6. A sealing ring 11 is fixedly connected to the suction tee 2.1 on the outer side of the convex ring 12.1. One end of the sealing ring 11 is tightly connected to the suction tee 2.1 of the side-suction centrifugal pump. The impeller 12 is installed on the pump main shaft 1 through the fitting of the convex ring 12.1 and the sealing ring 11. There are no requirements for axial position, it is easy to install, and it can generate negative pressure well. The inner concave ring 11.1 of the sealing ring 11 fits and connects with the convex ring 12.1 of the impeller 12. The outer circumferential surface of the convex ring 12.1 fits with the inner circumferential surface of the inner concave ring 11.1 of the sealing ring to form a rotatable dynamic sealing structure that dynamically seals the fluid when the side-suction centrifugal pump is working. The radial clearance between the inner concave ring 11.1 of the sealing ring 11 and the convex ring 12.1 of the impeller 12 is 1mm.

[0063] The diameter of the impeller is determined by the inlet fluid pressure of the side-suction centrifugal pump. The lower the fluid pressure, the smaller the impeller diameter, and vice versa. When the inlet fluid pressure is between 0.01 and 0.04 MPa, the diameter of impeller 12 is 100 mm; when the inlet fluid pressure is between 0.05 and 0.08 MPa, the diameter of impeller 12 is 120 mm; the higher the inlet fluid pressure of the side-suction centrifugal pump, the larger the outer diameter of the impeller needs to be.

[0064] A portion of the impeller 12, a portion of the sealing ring 11, and a portion of the lip rubber seal 8.1 together form a relatively closed and vacuum-sealed liquid storage chamber 11.3. The liquid storage chamber 11.3 stores the suction force generated when the impeller 12 rotates and transmits this suction force to the lip 8.2 of the lip rubber seal, thereby reducing the tightness between the lip of the lip rubber seal and the first part of the bushing and reducing friction, thus extending the service life of the lip rubber seal. Under the suction force generated when the impeller rotates, the fluid in the liquid storage chamber is initially drawn into the chamber... The system maintains a stable negative pressure state, thereby reducing the friction between the lip of the lip rubber seal and the bushing, extending the service life of the lip rubber seal, and thus extending the service life of the mechanical seal. The radial hole 12.2 is connected to the liquid storage chamber 11.3 of the sealing part of the sealing ring 11. The function of the radial hole on the impeller is that when the impeller rotates, the centrifugal force generated by the rotation of the impeller will generate a suction force at the radial hole, thereby drawing the liquid in the liquid storage chamber of the sealing part into a negative pressure state. The setting of the radial hole allows the fluid in the pump chamber to flow back into the liquid storage chamber to cool the lip rubber seal.

[0065] The sealing ring 11 has two 8mm diameter through holes 11.2 on one side to limit the amount of fluid in the pump chamber to enter the liquid storage chamber of the sealing part. The through holes 11.2 are connected to the liquid storage chamber 11.3 of the sealing part. The fluid entering the liquid storage chamber of the sealing part plays the role of cooling or flushing components such as the lip rubber seal, the first part of the bushing and the second part of the bushing.

[0066] An annular groove 12.3 is also provided on the rotating wheel 12 in a radial direction perpendicular to the rotating wheel 12. One end of the annular groove 12.3 is connected to the radial hole 12.2, and the other end is connected to the liquid storage chamber 11.3 of the sealing part.

[0067] The impeller 12 is also provided with multiple return holes 12.4 along the axial direction of the pump main shaft 1. The return holes are used to introduce materials to cool the rubber sealing ring and the bushing. The setting of the annular groove facilitates the manufacturing of the impeller. The annular groove precisely connects the radial hole of the impeller with the return hole. The return hole 12.4 on the impeller 12 is connected to the annular groove 12.3.

[0068] The impeller 5 is located on one side of the mechanical seal dynamic ring 6.1; the mechanical seal 6, which has a mechanical seal dynamic ring 6.1 and a mechanical seal stationary ring 6.2, is located on the outside of the lip rubber seal ring 8; the seal ring mounting box 7 is located in the radial direction of the lip rubber seal ring 8 and is located on the outside of the lip rubber seal ring 8; the convex ring 12.1 is a circular convex ring provided on the impeller 12 near the mechanical seal 6.

[0069] The centrifugal pump's flow-through components are made of ultra-high molecular weight polyethylene; the pump casing 16, impeller 15, pump cover 14, and suction tee 2.1 are all steel-lined plastic structures, and their manufacturing method is the same as that of plastic-lined centrifugal pumps in the industry; the impeller 12 is a two-piece type, and the radial hole 12.2 is formed by two plates clamping together.

[0070] At the positions of the mechanical seal dynamic ring 6.1 and mechanical seal stationary ring 6.2 of the mechanical seal 6, a liquid storage pan 2.2 is provided on the suction tee 2.1. The liquid storage pan 2.2 is filled with grease. The grease in the liquid storage pan can lubricate the mechanical seal dynamic ring and mechanical seal stationary ring to reduce the friction between them. This makes the shaft seal of the side-suction centrifugal pump have a longer service life without the need for cooling water, thereby improving the anti-air breakage performance of the vertical side-suction centrifugal pump.

[0071] The side-suction centrifugal pump in this utility model is manufactured as follows:

[0072] The pump main shaft 1, bearing housing 2, bearing 3, bearing side cover 4, and impeller 5 are obtained through machining. Bearing 3, mechanical seal dynamic ring 6.1, mechanical seal stationary ring 6.2, and lip-shaped rubber seal ring 8 are procured. The first part 10 and the second part 13 of the bushing are machined from ceramic or stainless steel. The sealing ring mounting box 7 (which can be integrally manufactured with or separately from the sealing fluid collar 11) is machined from plastic or metal. The sealing fluid collar 11 is obtained by hot pressing and machining from plastic, and one to two fluid passage holes 11.2 with a diameter of 6-10 mm are opened on one side of the sealing fluid collar 11. The blank of the impeller 12 is made from ceramic. After machining the blank, the impeller 12 is radially cut open according to the pressure of the fluid at the centrifugal pump inlet. An annular groove is provided on the side, and then the two rotating wheels 12 are clamped and installed. This creates radial holes 12.2 on the plates of the rotating wheels 12. The two-piece structure of the rotating wheels 12 facilitates cleaning after blockage. During installation and use, an annular gasket is used to seal the annular groove. 6 to 20 radial holes 12.2 with a diameter of 4 to 20 mm are formed on the rotating wheels 12 (the higher the pressure, the more radial holes on the rotating wheel; the smaller the pump's suction inlet diameter, the smaller the diameter of the radial holes; if the pump suction inlet diameter is within 100 mm, a rotating wheel 12 with a radial hole diameter of 5 to 8 mm is selected; if the pump suction inlet diameter is within 150 to 200 mm, a rotating wheel 12 with a radial hole diameter of 10 to 16 mm is selected). The larger the diameter of the inlet and the greater the flow rate, the larger the diameter of the radial hole of the impeller should be. When setting the diameter of the radial hole, the solid content of the material being pumped should also be considered. When the solid content is high and the slurry viscosity is high, the diameter of the radial hole 12.2 of the impeller 12 should be relatively larger, and vice versa. After obtaining the above components, install them according to the conventional installation method of the anti-corrosion centrifugal pump. Assemble the pump main shaft 1, bearing 3, bearing seat 2, bearing side cover 4, and coupling 18 together to form a transmission unit. Then, install the impeller 5, the first part of the shaft sleeve 10, the mechanical seal moving ring 6.1, the mechanical seal stationary ring 6.2, the second part of the shaft sleeve 13, the lip rubber seal ring 8, the seal ring mounting box 7, the suction tee 2.1, the impeller 12, the sealing ring 11, and the pump cover 14 in sequence. The components are assembled together; then the sealing plate is installed, and the sealing ring 11 is bolted to the suction tee 2.1. The inner concave ring 11.1 of the sealing ring 11 is fitted with the convex ring 12.1 of the impeller 12, and the radial clearance between the outer circumferential surface of the convex ring 12.1 of the impeller 12 and the inner circumferential surface of the inner concave ring 11.1 of the sealing ring is controlled within the range of 0.5 to 1.5 mm. The impeller 15 is fixed on the pump main shaft 1, and then the pump casing 16, mounting base 17, and motor 19 are installed. The resulting anti-corrosion slurry pump has a high vacuum degree in the shaft seal and can operate safely without external cooling water. After debugging, painting, packaging and other steps, the finished centrifugal pump of this utility model, which does not require external cooling water and can transport clear liquid or slurry, is obtained.

[0073] The side-suction centrifugal pump designed in this utility model increases the vacuum degree of the pump shaft seal, creating a negative pressure field in the pump sealing part. Then, the internally leaked air is sealed by the mechanical seal, thereby achieving a dynamic balance between the inside and outside of the seal, enabling the pump to operate safely without leakage. Increasing the vacuum degree of the pump sealing part is the key to the reliability of the shaft seal.

Claims

1. A side-suction centrifugal pump, comprising a pump casing (16), a pump cover (14), a pump shaft (1), a bearing housing (2), a bearing (3), a bearing side cover (4), a mounting base (17), a coupling (18), a motor (19), an impeller (15), a fan wheel (5), a mechanical seal (6), a sealing ring mounting box (7), a suction tee (2.1), and a lip-shaped rubber sealing ring (8), wherein the mechanical seal (6) comprises a mechanical seal dynamic ring (6.1) and a mechanical seal stationary ring (6.2), and the pump shaft (1) is provided with a first part (10) and a second part (13) of a bushing in sections, characterized in that: A rotating wheel (12) is provided on one side of the lip-shaped rubber seal (8) on the pump main shaft (1). The rotating wheel (12) is clamped and fixed on the pump main shaft (1) by the first part (10) and the second part (13) of the bushing. The rotating wheel (12) can rotate with the rotation of the pump main shaft (1). A radial hole (12.2) is opened on the rotating wheel (12) along the radial direction of the rotating wheel (12). A convex ring (12.1) is provided on the side near the mechanical seal (6). A sealing ring (11) is fixedly connected to the suction port tee (2.1) on the outer side of the convex ring (12.1). The inner concave ring (11.1) of the sealing ring (11) is fitted and connected to the convex ring (12.1) of the rotating wheel (12). The outer circumferential surface of the convex ring (12.1) and the inner circumferential surface of the inner concave ring (11.1) of the sealing ring are fitted to form a dynamic closed structure. A portion of the rotating wheel (12), a portion of the sealing ring (11), and a portion of the lip-shaped rubber seal (8.1) together form a sealing liquid storage cavity (11.3). The sealing liquid storage cavity (11.3) is used to store the suction force generated when the rotating wheel (12) is running and to transmit the suction force to the lip (8.2) of the lip-shaped rubber seal. The radial hole (12.2) communicates with the sealing liquid storage cavity (11.3) of the sealing ring (11). The sealing ring (11) has a liquid passage hole (11.2) on one side, and the liquid passage hole (11.2) is connected to the liquid storage cavity (11.3) of the sealing part; The rotating wheel (12) is also provided with an annular groove (12.3) in a radial direction perpendicular to the rotating wheel (12). One end of the annular groove (12.3) is connected to the radial hole (12.2), and the other end is connected to the liquid storage chamber (11.3) of the sealing part. The inside of the impeller (12) is provided with a plurality of return holes (12.4) along the axial direction of the pump main shaft (1); the return holes (12.4) on the impeller (12) are connected to the annular groove (12.3).

2. The side-suction centrifugal pump according to claim 1, characterized in that: One end of the sealing ring (11) is tightly connected to the suction tee (2.1) of the side-suction centrifugal pump; the impeller (12) is fitted onto the pump main shaft (1) through the convex ring (12.1) and the sealing ring (11).

3. The side-suction centrifugal pump according to claim 1, characterized in that: The number of liquid passage holes (11.2) is 1 to 3; the diameter of the liquid passage holes (11.2) is 4 to 10 mm; the number of radial holes (12.2) is 4 to 20; the diameter of the radial holes (12.2) is 4 to 12 mm; the radial clearance between the inner concave ring (11.1) of the sealing ring (11) and the convex ring (12.1) of the impeller (12) is 0.5 to 1.5 mm; when the inlet fluid pressure of the side-suction centrifugal pump is 0.01 to 0.04 MPa, the diameter of the impeller (12) is 90 to 110 mm; when the inlet fluid pressure of the side-suction centrifugal pump is 0.05 to 0.08 MPa, the diameter of the impeller (12) is 110 to 130 mm.

4. The side-suction centrifugal pump according to claim 3, characterized in that: The flow rate of the side suction centrifugal pump is 20-100 m 3 / h, a radial hole (12.2) with a pore size of 4-6 mm is selected; the flow rate of the side suction centrifugal pump is 300-500 m 3 / h, a radial hole (12.2) with a pore size of 10-12 mm is selected.

5. The side-suction centrifugal pump according to claim 1, characterized in that: The side-suction centrifugal pump can be a vertical centrifugal pump (2.0), a horizontal side-suction centrifugal pump, or a multi-stage side-suction centrifugal pump.

6. The side-suction centrifugal pump according to claim 5, characterized in that: When the side-suction centrifugal pump is a vertical centrifugal pump (2.0), a liquid storage tray (2.2) is provided on the suction tee (2.1) at the mechanical seal dynamic ring (6.1) and mechanical seal stationary ring (6.2) of the mechanical seal (6), and the liquid storage tray (2.2) is filled with grease.

7. The side-suction centrifugal pump according to claim 1, characterized in that: The mechanical seal (6), having the mechanical seal moving ring (6.1) and the mechanical seal stationary ring (6.2), is located outside the lip rubber seal ring (8); the seal ring mounting box (7) is located in the radial direction of the lip rubber seal ring (8) and is located outside the lip rubber seal ring (8).

8. The side-suction centrifugal pump according to claim 1, characterized in that: The convex ring (12.1) is a circular convex ring provided on the side of the rotating wheel (12) near the mechanical seal (6).

9. The side-suction centrifugal pump according to claim 1, characterized in that: The pump casing (16), impeller (15), pump cover (14) and suction tee (2.1) are all steel-lined plastic structures.

10. The side-suction centrifugal pump according to claim 1, characterized in that: The wheel (12) is a two-piece type, and the radial hole (12.2) is formed by clamping two plates together.

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