Multistage slurry pump

Abstract

The utility model provides a multistage slurry pump, which relates to the technical field of slurry pumps and comprises a pump body, a rotor structure and a wear-resistant structure. The pump body is provided with an inner space, a water inlet and a water outlet. The rotor structure is assembled on the pump body and comprises a pump shaft and a multi-stage impeller; the pump shaft is arranged in the inner space of the pump body in a penetrating mode, and the multiple stages of impellers are sequentially arranged on the pump shaft. A wear-resistant structure is arranged in the internal space of the pump body; the wear-resistant structure is assembled on the pump body and surrounds the rotor structure to form a part of a fluid channel in the internal space of the pump body, and fluid in the internal space of the pump body can be guided to flow. Through the design, on one hand, the wear-resistant sleeve can protect the pump body, and the service life of the pump body is prolonged; and on the other hand, the wear-resistant structure serves as an independent component, the structure is relatively simple, and machining is easy.

Description

TECHNICAL FIELD

[0001] The present application relates to the technical field of slurry pumps, in particular to a multi-stage slurry pump. BACKGROUND

[0002] A slurry pump is a special industrial pump designed to transport liquid-solid mixed medium (i.e. "slurry") containing high-concentration solid particles (such as sand, coal ash, silt, etc.). Its design focuses on wear resistance, corrosion resistance and impact resistance, and is widely used in mining, metallurgy, power, dredging, chemical industry and other fields. The slurry pump is an indispensable key equipment in heavy industry, and its performance directly affects production efficiency and cost control. Correct selection, reasonable operation and regular maintenance are the core of ensuring its long-term stable operation. At present, since the fluid transported by the slurry pump contains a large amount of impurities, the impurities in the fluid can quickly wear the pump body of the slurry pump, shorten the service life of the slurry pump and increase the use cost. CONTENT OF THE INVENTION

[0003] The technical problem to be solved by the present application is to provide a multi-stage slurry pump to solve the above problems in the prior art.

[0004] A multi-stage slurry pump, comprising:

[0005] a pump body provided with an internal space, an inlet and an outlet;

[0006] a rotor structure assembled on the pump body, comprising a pump shaft and a plurality of impellers; the pump shaft is arranged in the internal space of the pump body, and the plurality of impellers are arranged on the pump shaft in sequence;

[0007] a wear-resistant structure is arranged in the internal space of the pump body; the wear-resistant structure is assembled on the pump body and surrounds the rotor structure, forms part of a fluid passage in the internal space of the pump body, and can guide the flow of fluid in the internal space of the pump body.

[0008] Optionally, the wear-resistant structure is composed of a plurality of wear-resistant sleeves.

[0009] a plurality of impeller chambers adapted to the plurality of impellers are formed in the internal space of the pump body, each impeller of the plurality of impellers corresponds to an impeller chamber, and the outer periphery of at least part of the impeller chambers is provided with a wear-resistant sleeve; the wear-resistant sleeve is sleeved in the inner ring of the pump body and forms an impeller chamber in the inner ring to surround the corresponding impeller in a ring shape.

[0010] Optionally, the impeller chambers corresponding to the impellers other than the last-stage impeller are each provided with a wear-resistant sleeve.

[0011] Optionally, all the impeller chambers are one-to-one arranged with wear-resistant sleeves.

[0012] Optionally, the wear-resistant sleeve is detachably assembled on the pump body.

[0013] Optionally, the wear-resistant sleeve is non-detachably assembled on the pump body.

[0014] Optionally, part or all of the impellers in the multi-stage impeller are A-type impellers; the A-type impeller is composed of a wear-resistant sleeve and an impeller body; the wear-resistant sleeve is sleeved on the pump shaft and rotates synchronously with the pump shaft; the impeller body is wrapped around the outer periphery of the wear-resistant sleeve and is fixedly combined with the wear-resistant sleeve.

[0015] Optionally, the wear-resistant sleeve and the impeller body form a concave-convex alternating combined surface in the axial direction.

[0016] Optionally, the wear-resistant sleeve and the impeller body form an integrated structure.

[0017] Optionally, the pump body is provided with a guide vane body corresponding to each stage of impeller; the guide vane body is provided with a wear-resistant part near the pump shaft.

[0018] In the present application, a wear-resistant structure is arranged in the internal space of the pump body; the wear-resistant structure is assembled on the pump body and surrounds the rotor structure, constituting part of the fluid channel in the internal space of the pump body and being capable of guiding the fluid flow in the internal space of the pump body. The wear-resistant structure is assembled in the internal space of the pump body, on the one hand, the wear-resistant sleeve can protect the pump body and increase the service life of the pump body. On the other hand, as a separate component, the wear-resistant structure is relatively simple in structure and easy to process. BRIEF DESCRIPTION OF DRAWINGS

[0019] Figure 1 is a structural schematic diagram of a multi-stage slurry pump in the embodiments of the present application.

[0020] Figure 2 is Figure 1 a partial enlarged view of

[0021] Fig. 1 is a structural schematic diagram of a multi-stage slurry pump in the embodiments of the present application. DETAILED DESCRIPTION

[0022] The following are specific embodiments of the present application and further describe the technical solutions of the present application in conjunction with the drawings, but the present application is not limited to these embodiments. In the following description, specific details such as specific configurations and components are provided only to help a comprehensive understanding of the embodiments of the present application. Therefore, it should be clear to those skilled in the art that various changes and modifications can be made to the embodiments described herein without departing from the scope of protection of the present application. In addition, in order to be clear and concise, the description of known functions and structures is omitted.

[0023] It should be noted that the embodiments and features in the embodiments can be combined with each other without conflict.

[0024] It should be noted that the multi-stage slurry pump is used to transport liquid-solid mixed medium (i.e., "slurry") containing high-concentration solid particles (such as sand, coal ash, silt, etc.). Since the fluid transported by the slurry pump contains a large amount of impurities, the impurities in the fluid will quickly wear the pump body of the slurry pump, shorten the service life of the slurry pump, and increase the use cost. Therefore, the present application provides a multi-stage slurry pump to improve the service life of the pump body of the slurry pump and reduce the cost of the slurry pump.

[0025] In the embodiments of the present application, the multi-stage slurry pump includes a pump body, a rotor structure, and a wear-resistant structure. The pump body is provided with an internal space, an inlet, and an outlet. The rotor structure is assembled on the pump body and includes a pump shaft and a multi-stage impeller. The pump shaft is arranged in the internal space of the pump body, and the multi-stage impeller is arranged on the pump shaft in sequence. The wear-resistant structure is arranged in the internal space of the pump body. The wear-resistant structure is assembled on the pump body and surrounds the rotor structure, constitutes part of the fluid passage in the internal space of the pump body, and can guide the flow of fluid in the internal space of the pump body. In this way, on the one hand, the wear-resistant sleeve can protect the pump body and increase the service life of the pump body. On the other hand, as a separate component, the wear-resistant structure is relatively simple in structure and easy to process.

[0026] The multi-stage slurry pump can adopt a centrifugal pump or a mixed flow pump, and therefore the multi-stage impeller can be a centrifugal pump impeller or a mixed flow pump impeller. The centrifugal pump works by rotating the impeller to make water move in a centrifugal manner. Before starting, the pump body and the water suction pipe are filled with water. Then, the motor is started to make the pump shaft drive the impeller and water to rotate at a high speed. The water moves in a centrifugal manner and is thrown to the outer edge of the impeller, and then flows into the water pressure pipeline of the water pump through the flow channel of the volute pump body. The mixed flow pump has both centrifugal force and axial thrust on the liquid during the working process. In a specific technical scheme, the multi-stage pump is a multi-stage centrifugal pump, and the multi-stage impeller is a centrifugal pump impeller. When working, the liquid is transported into the pump body through the water inlet. Due to the action of the impeller, the kinetic energy and potential energy of the liquid are both increased. After the liquid enters the guide vane, part of the kinetic energy is converted into potential energy (each stage of the impeller is provided with a guide vane). The reverse blades of the guide vane transport the liquid to the inlet of the next stage of the impeller under favorable hydraulic characteristics. Each stage increases the same pressure. After passing through the last stage of the guide vane, the liquid is discharged from the water outlet. The water pressure of the multi-stage centrifugal pump is the superposition of the pressures of the stages, and therefore a large outlet pressure can be obtained.

[0027] In addition, it should be noted that the rotor structure is the rotating part in the pump body, which includes the pump shaft, the multi-stage impeller, and other components that rotate with the pump shaft. The rotor structure and the pump body are provided with multiple gap seals at different positions, which seal the small gap between the rotor structure and the pump body.

[0028] The following will be described in detail Figure 1 and Figure 2 The multi-stage slurry pump provided by the embodiments of the present application will be specifically described.

[0029] Referring to Figure 1 and Figure 2 , the multi-stage slurry pump includes a pump body 10, a rotor structure 20, and a wear-resistant structure. The pump body 10 is provided with an internal space 11, a water inlet 13, and a water outlet 14. The rotor structure 20 is assembled on the pump body 10 and includes a pump shaft 21 and a multi-stage impeller 22. The pump shaft 21 is arranged in the internal space 11 of the pump body 10, and the multi-stage impeller 22 is arranged on the pump shaft 21 in sequence. The wear-resistant structure is arranged in the internal space 11 of the pump body 10 and is assembled on the pump body 10 to surround the rotor structure 20, thereby forming part of the fluid passage in the internal space 11 of the pump body 10 and guiding the flow of the fluid in the internal space 11 of the pump body 10.

[0030] When the multi-stage slurry pump works, the fluid medium enters the internal space 11 of the pump body 10 from the water inlet 13 on the pump body 10, is gradually pressurized by the multi-stage impeller 22, and is then discharged from the water outlet 14 on the pump body 10. In the structure shown in Figure 1 , four stages of impellers are arranged in the pump body 10.

[0031] The wear-resistant structure is composed of a plurality of wear-resistant sleeves 30; a plurality of impeller chambers 12 adapted to the multi-stage impeller are formed in the inner space 11 of the pump body 10, each stage of the multi-stage impeller corresponds to one impeller chamber 12, and the outer periphery of at least part of the impeller chambers 12 is provided with a wear-resistant sleeve 30; the wear-resistant sleeve 30 is sleeved in the inner ring of the pump body 10, and the impeller chamber 12 is formed in the inner ring thereof to circumferentially surround the corresponding impeller.

[0032] Specifically, the impeller 22 is accommodated in the impeller chamber 12, and the wear-resistant sleeve 30 acts as an outer ring structure of the impeller chamber 12, constitutes part of the fluid passage, and is used to guide the fluid to flow step by step inside the pump body. In this design, the wear-resistant sleeve 30 is an independent structure independent of the pump body 10, is assembled into the pump body 10 after machining is completed, and can be used to protect the pump body to increase the service life of the pump body. In addition, since the wear-resistant sleeve 30 is independent of the pump body 10, the structure is simple, and the machining process is not affected by the complex pump body structure, the machining is more convenient, and the machining cost is low.

[0033] The outer periphery of part or all of the impeller chambers 12 is provided with a wear-resistant sleeve 30, and the wear-resistant sleeve 30 is wrapped around the corresponding impeller. In some embodiments, the corresponding impeller chambers 12 of the other impellers except the last stage of impeller are all provided with a wear-resistant sleeve 30. As shown in the structure, the multi-stage slurry pump includes four stages of impellers, the four stages of impellers correspond to four impeller chambers 12, and three wear-resistant sleeves 30 are arranged on the pump body 10, and the three wear-resistant sleeves 30 correspond to the first three stages of impellers and impeller chambers respectively. Figure 1

[0034] In some embodiments, all the impeller chambers are arranged with wear-resistant sleeves one by one, and each stage of impeller is wrapped by a wear-resistant sleeve.

[0035] The wear-resistant sleeve 30 is sleeved in the inner ring of the pump body 10 and is fixed together with the pump body 10 after separate machining and manufacturing. In some optional embodiments, the wear-resistant sleeve 30 is assembled on the pump body 10 in a detachable connection manner, when the wear-resistant sleeve 30 is damaged, maintenance personnel can only replace the damaged wear-resistant sleeve 30, without the need to replace the pump body 10, and the maintenance cost is lower. In some optional embodiments, the wear-resistant sleeve 30 is assembled on the pump body 10 in a non-detachable connection manner.

[0036] In some embodiments, part or all of the impellers in the multi-stage impeller are A-type impellers 22a; the A-type impeller 22a is composed of a wear-resistant shaft sleeve 221 and an impeller body 222; the wear-resistant shaft sleeve 221 is sleeved on the pump shaft 21 and rotates synchronously with the pump shaft 21; and the impeller body 222 is wrapped around the outer periphery of the wear-resistant shaft sleeve 221 and is fixedly combined together with the wear-resistant shaft sleeve 221.

[0037] ​It should be noted that the inner ring of the impeller of the multi-stage slurry pump (corresponding to the wear-resistant bushing 221) requires high machining precision, thus requiring relatively low hardness to facilitate high-precision machining. The main body of the impeller (corresponding to the impeller body 222) needs to rotate at high speed to perform work on the slurry and achieve slurry transport, requiring high wear resistance and thus high hardness. Therefore, the Type A impeller 22a is assembled from the wear-resistant bushing 221 and the impeller body 222. The wear-resistant bushing 221 can be designed with low hardness and high precision to meet assembly requirements, while the impeller body 222 can be designed with high hardness to meet wear resistance requirements. Therefore, the Type A impeller 22a uses two materials with different process requirements at different locations to meet their respective usage requirements, while also possessing the advantages of high assembly precision and good wear resistance.

[0038] Furthermore, the Class A impeller 22a consists of a wear-resistant bushing 221 and an impeller body 222. In some technical solutions, the wear-resistant bushing 221 is an inlaid casting, which can be manufactured using an inlay casting process.

[0039] In this embodiment of the application, some or all of the impellers in the multi-stage impeller are Class A impellers 22a. Therefore, in this embodiment of the application, the multi-stage slurry pump only requires that at least one of the multi-stage impellers be a Class A impeller. Figure 1 In the structure shown, the multi-stage slurry pump includes four impellers, all of which are Class A impellers 22a. Therefore, each impeller is composed of a wear-resistant bushing 221 and an impeller body 222.

[0040] refer to Figure 2 ,exist Figure 2 In the structure shown, the wear-resistant bushing 221 and the impeller body 222 form alternating concave and convex mating surfaces along the axial direction. Furthermore, in this embodiment, the wear-resistant bushing 221 and the impeller body 222 form an integral structure. Specifically, the wear-resistant bushing 221 is an inlaid casting and can be manufactured using an inlay casting process.

[0041] refer to Figure 2 The pump body 10 has guide vanes 15 arranged one-to-one at the outlet end of each impeller stage. Each guide vane 15 has a wear-resistant part 151 near the pump shaft 21. The wear-resistant part 151 increases the wear resistance of the mating joint, thereby increasing its service life. Furthermore, the wear-resistant part 151 can be a separate component or an integral part of the guide vane 15.

[0042] In summary, in the embodiments of the present application, the wear-resistant structure is arranged in the internal space of the pump body; the wear-resistant structure is assembled on the pump body and surrounds the rotor structure, thereby constituting a part of the fluid channel in the internal space of the pump body and being capable of guiding the fluid flow in the internal space of the pump body. The wear-resistant structure is assembled in the internal space of the pump body, on the one hand, the wear-resistant sleeve can protect the pump body and increase the service life of the pump body. On the other hand, the wear-resistant structure is a separate component, and the structure is relatively simple and easy to process. In some embodiments, the wear-resistant structure is composed of a plurality of wear-resistant sleeves.

[0043] In the above-described embodiments of the present application, the description of each embodiment has its own focus, and the parts not described in detail in a certain embodiment can be referred to the relevant description of other embodiments.

[0044] In addition, the terms "first", "second" are only used for descriptive purposes and cannot be understood as indicating or implying relative importance or implicitly indicating the number of the indicated technical features. Therefore, the features defined with "first", "second" can explicitly or implicitly include at least one of the features. In the description of the present application, the meaning of "a plurality of" is at least two, for example, two, three, etc., unless otherwise specifically limited. It should be noted that the terms used herein are only for the purpose of describing specific embodiments and are not intended to limit the exemplary embodiments according to the present application. As used herein, unless the context clearly indicates otherwise, the singular form is intended to include the plural form, and in addition, it should be understood that when the terms "comprise" and / or "include" are used in the specification, it means that the features, steps, operations, devices, components and / or their combinations are present.

[0045] The specific embodiments described herein are merely illustrative of the technical solutions of the present application. Those skilled in the art of the present application can make various modifications or supplements to the described specific embodiments or use similar ways to replace them, without departing from the scope defined by the claims of the present application.

Claims

1. A multi-stage slurry pump characterized by, The multi-stage slurry pump comprises: a pump body provided with an internal space, an inlet and an outlet; a rotor structure assembled on the pump body, comprising a pump shaft and multi-stage impellers; the pump shaft is arranged in the internal space of the pump body, and the multi-stage impellers are arranged on the pump shaft in sequence; a wear-resistant structure is arranged in the internal space of the pump body; the wear-resistant structure is assembled on the pump body and surrounds the rotor structure, forming part of a fluid passage in the internal space of the pump body and being capable of guiding the fluid flow in the internal space of the pump body.

2. The multi-stage slurry pump of claim 1, wherein, The wear-resistant structure is composed of a plurality of wear-resistant sleeves. A plurality of impeller chambers adapted to the multi-stage impellers are formed in the internal space of the pump body; each stage of the multi-stage impellers corresponds to an impeller chamber, and the outer periphery of at least part of the impeller chambers is provided with a wear-resistant sleeve; the wear-resistant sleeve is sleeved in the inner ring of the pump body and forms an impeller chamber in the inner ring to circumferentially surround the corresponding impeller.

3. The multi-stage slurry pump of claim 2, wherein, The wear-resistant sleeves corresponding to the impeller chambers of the impellers other than the last stage of impellers are provided correspondingly.

4. The multi-stage slurry pump of claim 2, wherein, All the impeller chambers are one-to-one correspondingly arranged with wear-resistant sleeves.

5. The multi-stage slurry pump of claim 2, wherein, The wear-resistant sleeves are detachably connected to the pump body.

6. The multi-stage slurry pump of claim 2, wherein, The wear-resistant sleeves are non-detachably connected to the pump body.

7. The multi-stage slurry pump of any one of claims 1-6, wherein, Part or all of the impellers in the multi-stage impellers are A-type impellers; the A-type impeller is composed of a wear-resistant sleeve and an impeller body; the wear-resistant sleeve is sleeved on the pump shaft and rotates synchronously with the pump shaft; the impeller body is wrapped around the outer periphery of the wear-resistant sleeve and is fixedly combined with the wear-resistant sleeve.

8. The multi-stage slurry pump of claim 7, wherein, The wear-resistant sleeve and the impeller body form a concave-convex alternating combined surface in the axial direction.

9. The multi-stage slurry pump of claim 7, wherein, The wear-resistant sleeve and the impeller body form an integrated structure.

10. The multi-stage slurry pump of any one of claims 1-6, wherein, The pump body is one-to-one correspondingly arranged with guide vane bodies at the outlet of each stage of impellers; the guide vane bodies are provided with wear-resistant parts at positions close to the pump shaft.

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