Anti-corrosion centrifugal pump with sheath fluoroplastic layer

Abstract

The utility model relates to an anti-corrosion centrifugal pump with a sheath fluoroplastic layer. A main shaft anti-corrosion sheath is arranged at an axial gap between a mechanical seal and an impeller of a pump machine; and a sheath fluoroplastic layer is lined on the contact part of the main shaft anti-corrosion sheath and liquid in a pump cavity of the pump machine. The double-end-face mechanical seal has the beneficial effects that the main shaft anti-corrosion sheath is arranged at the axial gap part between the movable ring seat of the double-end-face mechanical seal and the pump impeller, so that the anti-corrosion protection problem of the axial gap on the main shaft is solved; a sheath fluoroplastic layer (a steel ladle plastic structure) with corrosion resistance is lined at a liquid contact part between the main shaft corrosion-resistant sheath and a pump cavity of a pump machine, so that the main shaft corrosion-resistant sheath has metal strength and good corrosion resistance, the corrosion resistance problem of the centrifugal pump main shaft is solved, and meanwhile, the mechanical strength requirement of the corrosion-resistant sheath is also met; and the main shaft is good in anti-corrosion performance, and the shaft gap part is good in external leakage prevention performance.

Description

Technical Field

[0001] This utility model belongs to the field of centrifugal pump corrosion protection technology, and in particular relates to a corrosion-resistant centrifugal pump with a sheath fluoroplastic layer. Background Technology

[0002] To facilitate the installation and use of mechanical seals and to allow them to adapt to the axial space of the pump, an effective method is to design an L-shaped adjusting sleeve and an adjusting O-ring at one end of the mechanical seal. This type of seal can handle media containing chloride and fluoride ions and will not be corroded in these conditions.

[0003] In the existing technology, the L-type adjusting sleeve is made of stainless steel. The mechanical seal has a low corrosion resistance level and the corrosiveness requirements of the conveyed medium are not high. After the mechanical seal uses non-metallic materials for the L-type adjusting sleeve of the axial spacing, the corrosion resistance requirements are increased. Using stainless steel anti-corrosion sleeves can no longer meet the requirements. However, if ceramic or plastic is used to make the sleeve for the main shaft mounting spacing section, the strength is insufficient and it is not feasible. Therefore, there is a problem of main shaft corrosion protection. Utility Model Content

[0004] The purpose of this invention is to overcome the shortcomings of the existing technology and provide a corrosion-resistant centrifugal pump with a sheath fluoroplastic layer, which has a high corrosion resistance level, good main shaft corrosion resistance, and good external leakage prevention performance in the shaft clearance.

[0005] This corrosion-resistant centrifugal pump with a fluoroplastic sheath includes a main shaft, shaft seal, pump casing, impeller, impeller cap, pump cover, bearing bracket, bearing, side cover, coupling, motor, and mounting base. The shaft seal is a double-end mechanical seal. The mechanical seal includes a sealing box, shaft sleeve, rotating ring, rotating ring seat, stationary ring, stationary ring seat, spring, cooling water seal assembly, and positioning buckle. The sealing box is equipped with a cooling water inlet and a cooling water outlet.

[0006] The bushing and the rotating ring seat are integrally molded;

[0007] The rotating ring seat of the mechanical seal is made of non-metallic material;

[0008] A main shaft anti-corrosion sleeve is provided at the axial clearance between the mechanical seal and the pump impeller; the part of the main shaft anti-corrosion sleeve that comes into contact with the liquid in the pump chamber is lined with a fluoroplastic layer.

[0009] As a preferred option, the spindle anti-corrosion sleeve and the fluoroplastic layer of the sleeve are integrally steel-clad plastic structures.

[0010] As a preferred embodiment, one end of the spindle anti-corrosion sleeve extends radially outward into an L-shaped flange.

[0011] As a preferred option, the fluoroplastic layer of the sheath is made of perfluoroethylene propylene, fluorinated resin, rubber, polypropylene, polyethylene, or ultra-high molecular weight polyethylene.

[0012] Preferably, the rotating ring is fitted onto the rotating ring seat; or the rotating ring is sleeve-shaped and surrounds the outer circumference of the rotating ring seat; the corrosion-resistant centrifugal pump is a front-suction centrifugal pump with the suction inlet in the axial direction, or a side-suction centrifugal pump with the suction inlet on the shaft side.

[0013] As a preferred option:

[0014] The flow-through components of the corrosion-resistant centrifugal pump are made of plastic or ceramic.

[0015] The impeller, pump cover, and pump casing are all made of steel-lined ultra-high molecular weight polyethylene, or the impeller, pump cover, and pump casing are all made of plastic.

[0016] The sealed box is made of plastic, metal, or resin.

[0017] The moving ring seat is made of polytetrafluoroethylene propylene, and the bushing is made of stainless steel;

[0018] Both the moving ring and the stationary ring are made of silicon carbide.

[0019] The beneficial effects of this utility model are as follows: A main shaft anti-corrosion sleeve is installed in the axial clearance between the moving ring seat of the double-end mechanical seal and the pump impeller, solving the problem of corrosion protection of the axial clearance on the main shaft; the contact area between the main shaft anti-corrosion sleeve and the liquid inside the pump chamber is lined with a fluoroplastic layer (steel-coated plastic structure) with anti-corrosion properties, giving the main shaft anti-corrosion sleeve both the strength of metal and good anti-corrosion performance, solving the corrosion problem of the centrifugal pump main shaft, and also meeting the mechanical strength requirements of the anti-corrosion sleeve; it has a high anti-corrosion level, good main shaft anti-corrosion performance, and good anti-external leakage performance in the shaft clearance. Attached Figure Description

[0020] Figure 1 A schematic diagram of the fluoroplastic layer structure of the main spindle anti-corrosion sleeve at the contact point between the main spindle anti-corrosion sleeve and the liquid inside the pump chamber of the pump.

[0021] Figure 2 A schematic diagram of a corrosion-resistant centrifugal pump with a fluoroplastic sheath.

[0022] Figure 3 This is a schematic diagram of a corrosion-resistant centrifugal pump.

[0023] Explanation of reference numerals in the attached drawings: 1. Main shaft; 3. Moving ring; 4. Moving ring seat; 6. Main shaft anti-corrosion sleeve; 7. Impeller; 8. Stationary ring; 9. Fluoroplastic layer of sleeve; 10. Sleeve sealing ring; 14. Internal hole of moving ring seat; 16. Limiting and clamping ring; 20. Shaft sleeve; 21. Sealing box; 22. Spring; 23. Stationary ring seat; 24. Cooling water sealing assembly; 25. Cooling water inlet; 26. Cooling water outlet; 27. Positioning buckle; 28. Impeller cap; 29. ​​Pump cover; 30. Pump casing; 31. Shaft seal; 32. Bearing bracket; 33. Bearing; 34. Side cover; 35. Coupling; 36. Motor; 37. Mounting base. Detailed Implementation

[0024] 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.

[0025] Example 1

[0026] like Figures 1 to 3 As shown, a corrosion-resistant centrifugal pump with a fluoroplastic sheath includes a main shaft 1, a shaft seal 31, a pump casing 30, an impeller 7, an impeller cap 28, a pump cover 29, a bearing bracket 32, a bearing 33, a side cover 34, a coupling 35, a motor 36, and a mounting base 37; the shaft seal 31 is a double-end mechanical seal 2; the mechanical seal 2 includes a sealing box 21, a shaft sleeve 20, a rotating ring 3, a rotating ring seat 4, a stationary ring 8, a stationary ring seat 23, a spring 22, a cooling water sealing assembly 24, and a positioning buckle 27; the sealing box 21 is provided with a cooling water inlet 25 and a cooling water outlet 26;

[0027] The bushing 20 and the moving ring seat 4 are integrally formed;

[0028] The rotating ring seat 4 of the mechanical seal 2 is made of non-metallic material;

[0029] A main shaft anti-corrosion sleeve 6 is provided at the axial clearance 5 between the mechanical seal 2 and the impeller 7 of the pump. The main shaft anti-corrosion sleeve 6 and the fluoroplastic layer 9 are integrally steel-clad plastic structures, with one end of the main shaft anti-corrosion sleeve 6 extending radially outward into an L-shaped flange. The part of the main shaft anti-corrosion sleeve 6 that comes into contact with the liquid inside the pump chamber is lined with the fluoroplastic layer 9, which is made of fluoroplastic material. This design gives the main shaft anti-corrosion sleeve both the strength of metal and good anti-corrosion performance, solving the corrosion problem of the centrifugal pump main shaft while also meeting the mechanical strength requirements of the anti-corrosion sleeve.

[0030] The rotating ring 3 is embedded in the rotating ring seat 4; or the rotating ring 3 is sleeve-shaped, and the rotating ring 3 is sleeved around the outer periphery of the rotating ring seat 4; the corrosion-resistant centrifugal pump is a front-suction centrifugal pump with the suction port in the axial direction, or a side-suction centrifugal pump with the suction port on the shaft side.

[0031] The flow-through components of the corrosion-resistant centrifugal pump are made of plastic or ceramic.

[0032] Impeller 7, pump cover 29 and pump casing 30 are all made of steel-lined ultra-high molecular weight polyethylene, or impeller 7, pump cover 29 and pump casing 30 are all made of plastic; sealing box 21 is made of plastic, metal or resin; rotating ring seat 4 is made of polytetrafluoroethylene propylene, shaft sleeve 20 is made of stainless steel; rotating ring 3 and stationary ring 8 are both made of silicon carbide.

[0033] Example 2

[0034] Based on Example 1, the fluoroplastic layer 9 of the sheath is made of polytetrafluoroethylene propylene.

[0035] Example 3

[0036] Based on Example 1, the fluoroplastic layer 9 of the sheath is made of fluorinated rubber.

[0037] Example 4

[0038] Based on Example 1, the fluoroplastic layer 9 of the sheath is made of polypropylene.

[0039] Example 5

[0040] Based on Example 1, the fluoroplastic sheath layer 9 is made of polyethylene.

[0041] Example 6

[0042] Based on Example 1, the fluoroplastic sheath layer 9 is made of other plastic materials.

Claims

1. A corrosion-resistant centrifugal pump with a sheathed fluoroplastic layer, comprising a main shaft (1), a shaft seal (31), a pump casing (30), an impeller (7), an impeller cap (28), a pump cover (29), a bearing bracket (32), a bearing (33), a side cover (34), a coupling (35), a motor (36), and a mounting base (37); the shaft seal (31) is a double-end mechanical seal (2); the mechanical seal (2) comprises a sealing box (21), a shaft sleeve (20), a rotating ring (3), a rotating ring seat (4), a stationary ring (8), a stationary ring seat (23), a spring (22), a cooling water sealing assembly (24), and a positioning buckle (27); the sealing box (21) is provided with a cooling water inlet (25) and a cooling water outlet (26); characterized in that: The bushing (20) and the moving ring seat (4) are integrally formed; The rotating ring seat (4) of the mechanical seal (2) is made of non-metallic material; A main shaft anti-corrosion sleeve (6) is provided at the axial clearance (5) between the mechanical seal (2) and the impeller (7) of the pump; the main shaft anti-corrosion sleeve (6) and the part in contact with the liquid in the pump chamber of the pump are lined with a fluoroplastic layer (9).

2. The corrosion-resistant centrifugal pump with a fluoroplastic sheath as described in claim 1, characterized in that: The main shaft anti-corrosion sleeve (6) and the fluoroplastic layer of the sleeve (9) are steel-clad plastic structure as a whole.

3. The corrosion-resistant centrifugal pump with a fluoroplastic sheath as described in claim 2, characterized in that: One end of the spindle anti-corrosion sleeve (6) extends radially outward into an L-shaped flange.

4. The corrosion-resistant centrifugal pump with a fluoroplastic sheath as described in claim 1, characterized in that: The sheath fluoroplastic layer (9) is made of polytetrafluoroethylene propylene, fluorinated resin, rubber, polypropylene, polyethylene or ultra-high molecular weight polyethylene.

5. The corrosion-resistant centrifugal pump with a fluoroplastic sheath as described in claim 1, characterized in that: The rotating ring (3) is fitted onto the rotating ring seat (4); or the rotating ring (3) is sleeve-shaped, and the rotating ring (3) is sleeved around the outer circumference of the rotating ring seat (4); the anti-corrosion centrifugal pump is a front-suction centrifugal pump with the suction port in the axial direction, or a side-suction centrifugal pump with the suction port on the shaft side.

6. The corrosion-resistant centrifugal pump with a fluoroplastic sheath as described in claim 1, characterized in that: The flow-through components of the corrosion-resistant centrifugal pump are made of plastic or ceramic. The impeller (7), pump cover (29) and pump casing (30) are all made of steel-lined ultra-high molecular weight polyethylene, or the impeller (7), pump cover (29) and pump casing (30) are all made of plastic. The sealed box (21) is made of plastic, metal or resin; The moving ring seat (4) is made of polytetrafluoroethylene propylene, and the bushing (20) is made of 304 stainless steel; Both the moving ring (3) and the stationary ring (8) are made of silicon carbide.

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