Single-stage high-lift oil slurry pump

Abstract

The utility model discloses a single-stage high-lift oil slurry pump which comprises a pump body, an impeller, a pump cover and a main shaft, the main shaft is provided with a bearing body assembly in a matched mode, one end of the main shaft is arranged on the pump cover in a rotatable sealing and penetrating mode and is in transmission connection with the impeller in the pump body, and the single-stage high-lift oil slurry pump is characterized in that an end cover lining is arranged on the inner side of the pump cover; an inner volute and a suction lining are further arranged in the pump body, the end cover lining, the inner volute and the suction lining jointly form an inner cavity, the corresponding end cover lining and the inner volute are arranged on the two sides of the impeller in a surrounding mode in a sealing fit mode, the suction lining is arranged at an inlet of the pump body, the rear end of the suction lining is tightly attached to the front end of the inner volute through a conical surface, and a pressing plate is arranged at the rear end of the inner volute in a matched mode. The pressing plate is connected to the pump body; the impeller is arranged in a large-outer-diameter mode, and the impeller is made of high-strength abrasion-resistant materials. The pump can normally operate under the working conditions that the medium temperature is 363 DEG C and the lift is required to be 270 m.

Description

Technical Field

[0001] This utility model relates to an improved invention of an oil slurry pump, and more particularly to an improved invention of a single-stage high-lift oil slurry pump. Background Technology

[0002] Slurry pumps are industrial pumps specifically designed for conveying high-temperature, high-viscosity slurry media containing solid particles (such as catalyst powder). Currently, the standard models from mainstream domestic manufacturers have a single-stage head between 100 and 200 meters, suitable for general oil refining operations. When the single-stage head exceeds 250 meters, the following issues arise: 1. Excessively high impeller linear velocity (leading to cavitation and material fatigue); 2. Increased axial force (requiring special thrust bearing design); 3. Risk of seal leakage (shortened mechanical seal life under high temperature and pressure). Generally, slurry pumps with heads above 250 meters are recommended to be multi-stage pumps (e.g., two stages in series can reach 400-500 meters). Utility Model Content

[0003] The technical problem to be solved by this utility model is to overcome the shortcomings of the prior art and provide a single-stage high-lift slurry pump that can meet the high temperature and high wear conditions of slurry pumps and also meet the requirement of a single-stage lift of 270m.

[0004] To solve the above-mentioned technical problems, this utility model adopts the following technical solution: A single-stage high-lift slurry pump includes a pump body, an impeller, a pump cover, and a main shaft. The main shaft is equipped with a bearing assembly. One end of the main shaft is rotatably and sealed through the pump cover and is connected to the impeller inside the pump body. The pump cover has an end cap liner on its inner side. The pump body also has an inner volute and a suction liner. The end cap liner, inner volute, and suction liner together form an inner cavity. The corresponding end cap liner and inner volute are sealed and fitted around both sides of the impeller. The suction liner is located at the pump body inlet. The rear end of the suction liner is tightly fitted to the front end of the inner volute through a conical surface. A pressure plate is provided at the rear end of the inner volute and connected to the pump body. The impeller has a large outer diameter and is made of high-strength, wear-resistant material.

[0005] The outer diameter of the impeller is more than three times the inner diameter of the impeller inlet.

[0006] The impeller is made of high-chromium wear-resistant white cast iron BTMCr26.

[0007] The impeller is a closed impeller, and several radially arranged auxiliary blades are evenly provided on the outer sides of the front cover plate and the rear cover plate.

[0008] The front cover plate is provided with 5 auxiliary blades, and the rear cover plate is provided with 7 auxiliary blades.

[0009] The pump body inlet end is connected to one end of the inlet pipe, and the other end of the inlet pipe is connected to the inlet flange.

[0010] The inlet end of the impeller is sealed to the inner volute, and the inner volute is provided with a stepped opening, with the front end of the front cover plate matched and placed inside the stepped opening.

[0011] The rotating end of the impeller is provided with a throat bushing, which is connected to the sealing body. The sealing body is connected to the pump cover, and a mechanical seal is provided between the sealing body and the main shaft.

[0012] The beneficial effects of this utility model are that the improved single-stage high-lift slurry pump is resistant to high temperature and wear: the whole pump is designed with a double shell, and the material of the flow parts is high-chromium wear-resistant white cast iron BTMCr26; the pump has a high lift: it adopts an impeller with a large outer diameter design; the pump can effectively reduce leakage and sealing pressure: the front and rear cover plates of the impeller are designed with auxiliary blades to prevent particles from entering the sealing parts and pump cavity, reducing wear; the pump operates stably: the inner volute and the suction lining adopt a conical surface fit, with high coaxiality. Attached Figure Description

[0013] The specific embodiments of this utility model will be further described in detail below with reference to the accompanying drawings.

[0014] Figure 1 This is a schematic diagram of the structure of this utility model.

[0015] Figure 2 This is a schematic diagram of the impeller operation of this utility model.

[0016] Figure 3 This is a schematic diagram of the impeller structure of this utility model.

[0017] Figure 4 This utility model Figure 3 The left view.

[0018] Figure 5 This utility model Figure 3 The right view. Detailed Implementation

[0019] The accompanying drawings illustrate the structure of this utility model, and further details will be described below with reference to the drawings. In this embodiment, see the attached drawings. Figure 1-5This single-stage high-lift slurry pump includes a pump body 12, an impeller 9, a pump cover 5, and a main shaft 1. The main shaft 1 is equipped with a bearing assembly 2. One end of the main shaft 1 is rotatably and sealed through the pump cover 5 and is connected to the impeller 9 inside the pump body 12. Specifically, the impeller 9 is fixed to the main shaft 1 by a flat key 17 and an impeller nut 16, and rotates together with the main shaft 1. An end cover liner 8 is provided on the inner side of the pump cover 5. The pump body 12 also has an inner volute 10 and a suction liner 13, forming an outer cavity between the pump body 12 and the inner volute 10. The pump body 12 is provided with a warm pump inlet flange 18 and a warm pump outlet flange 11. The end cover liner 8, the inner volute 10, and the suction liner 13 together form the inner cavity. The end cover liner 8 and the inner volute 10 are sealed together and surround the impeller 9 on both sides. The suction liner 13 is located on the pump body 12. The pump body 12 has an inlet, and the suction liner 13 is installed on the pump body 12 by screws. The rear end of the suction liner 13 is tightly fitted to the front end of the inner volute 10 through a conical surface. The rear end of the inner volute 10 is equipped with a pressure plate 19, which is connected to the pump body 12. The pressure plate 19 is tightened to the pump body 12 by bolts 7. The pressure plate 19 applies pressure to the inner volute 10 towards the suction liner 13, so that the conical surfaces of the two fit tightly together. The impeller 9 has a large outer diameter, preferably more than three times the inner diameter of the impeller 9 inlet. The impeller 9 is made of high-strength wear-resistant material, preferably high-chromium wear-resistant white cast iron BTMCr26. The above embodiments can effectively increase the head of the slurry pump, ensure the strength and wear resistance of the impeller 9, and ensure the sealing of the pump body 12.

[0020] For a further improved implementation method, see Appendix Figure 3-5 The impeller 9 is a closed impeller, and a plurality of radially arranged auxiliary blades 22 are evenly provided on the outer sides of the front cover plate 20 and the rear cover plate 21; preferably, the front cover plate 20 is provided with 5 auxiliary blades 22 and the rear cover plate 21 is provided with 7 auxiliary blades 22. When the pump is running normally, in addition to the medium flowing from the inlet along the impeller 9 flow channel to the outlet, the medium outside the front cover plate 20 and the rear cover plate 21 is driven by the auxiliary blades 22, and the particles therein are discharged towards the outlet of the impeller 9 due to centrifugal force; this can balance the axial force, reduce leakage, reduce the pressure in the mechanical seal cavity, and prevent particles in the medium from entering the sealing parts and the pump cavity at the inlet of the impeller 9, thereby reducing the wear of the sealing parts.

[0021] As a further improved implementation, the inlet end of the pump body 12 is connected to one end of the inlet pipe 14, and the other end of the inlet pipe 14 is connected to an inlet flange 15 for installation and docking.

[0022] As a further improved specific implementation, the inlet end of the impeller 9 is sealed to the inner volute 10, and the corresponding inner volute 10 is provided with a stepped opening. The front end of the front cover plate 20 is matched and placed in the stepped opening to seal with it, thereby achieving the sealing of the impeller 9 inlet.

[0023] As a further improved specific implementation, the rotating end of the impeller 9 is provided with a throat bushing 6, the throat bushing 6 is connected to the sealing body 4, the sealing body 4 is connected to the pump cover 5, and a mechanical seal 3 is provided between the sealing body 4 and the main shaft 1. The mechanical seal 3, the sealing body 4, the throat bushing 6 and the main shaft 1 form a mechanical seal cavity 23.

[0024] In summary, the above are merely preferred embodiments of this utility model and are not intended to limit the scope of protection of this utility model. Any modifications, equivalent substitutions, improvements, etc., made within the spirit and principles of this utility model should be included within the scope of protection of this utility model.

Claims

1. A single-stage high-lift slurry pump, comprising a pump body, an impeller, a pump cover, and a main shaft, wherein the main shaft is equipped with a bearing assembly, and one end of the main shaft is rotatably and sealingly mounted on the pump cover and is connected to the impeller inside the pump body via a transmission drive, characterized in that: The pump cover has an end cover liner on its inner side, and the pump body also has an inner volute and a suction liner. The end cover liner, inner volute and suction liner together form an inner cavity. The corresponding end cover liner and inner volute are sealed and fitted around the impeller on both sides. The suction liner is set at the pump body inlet. The rear end of the suction liner and the front end of the inner volute are tightly fitted together by a conical surface. The rear end of the inner volute is equipped with a pressure plate, which is connected to the pump body. The impeller has a large outer diameter and is made of high-strength wear-resistant material.

2. The single-stage high-lift slurry pump as described in claim 1, characterized in that: The outer diameter of the impeller is more than three times the inner diameter of the impeller inlet.

3. The single stage high head oil slurry pump of claim 1, wherein: The impeller is made of high-chromium wear-resistant white cast iron BTMCr26.

4. The single stage high head oil slurry pump of claim 1, wherein: The impeller is a closed impeller, and several radially arranged auxiliary blades are evenly provided on the outer sides of the front cover plate and the rear cover plate.

5. The single stage high head oil slurry pump of claim 4, wherein: The front cover plate is provided with 5 auxiliary blades, and the rear cover plate is provided with 7 auxiliary blades.

6. The single stage high head oil slurry pump of claim 1, wherein: The pump body inlet end is connected to one end of the inlet pipe, and the other end of the inlet pipe is connected to the inlet flange.

7. The single stage high head oil slurry pump of claim 1, wherein: The inlet end of the impeller is sealed to the inner volute, and the inner volute is provided with a stepped opening, with the front end of the front cover plate matched and placed inside the stepped opening.

8. The single stage high head oil slurry pump of claim 1, wherein: The rotating end of the impeller is provided with a throat bushing, which is connected to the sealing body. The sealing body is connected to the pump cover, and a mechanical seal is provided between the sealing body and the main shaft.

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