Adjustable repair type multi-stage pump

Abstract

The utility model provides an adjustable repair type multi-stage pump, which relates to the technical field of multi-stage pumps and comprises a pump body and a rotor structure. The pump body is provided with an internal space, a water inlet and a water outlet. The rotor structure 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. The rotor structure is assembled on the pump body, and the assembling position can be adjusted in the axial direction of the pump shaft. Wherein a plurality of gap seals are arranged between the pump body and the rotor structure; at least partial gap sealing adopts a conical sealing structure; the conical sealing structures are provided with conical sealing surfaces, and the directions of the conical sealing surfaces of all the conical sealing structures are consistent, so that abrasion compensation can be carried out on the sizes of gaps of all the conical sealing structures by adjusting the axial mounting position of the rotor structure. Therefore, abrasion compensation can be carried out on the sizes of gaps of all the conical sealing structures by adjusting the axial installation position of the rotor structure, and the maintenance cost is lower.

Description

TECHNICAL FIELD

[0001] The present application relates to the technical field of multi-stage pump, in particular to an adjustable repair type multi-stage pump. BACKGROUND

[0002] Pump is a machine for conveying fluid or pressurizing fluid, and multi-stage pump refers to a pump with two or more than two impellers. Multi-stage pump can be used in many industrial departments such as petroleum, chemical industry, machinery, mining, light industry, medicine and food. In the internal structure of the multi-stage pump, the gap sealing structure between the pump body and the rotor structure will be worn with the use of the pump, resulting in the gradual increase of the gap and the failure of the sealing. Gap sealing is a sealing action using the small gap between moving parts, and the size of the gap has a great influence on the sealing performance. In the prior art, the related parts (such as impeller) need to be replaced after wear, which is inconvenient for maintenance and has high maintenance cost. CONTENT OF THE UTILITY MODEL

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

[0004] An adjustable repair type multi-stage pump, comprising:

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

[0006] A rotor structure 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; the rotor structure is assembled on the pump body and can be adjusted in the axial direction of the pump shaft.

[0007] Wherein, a plurality of gap seals are arranged between the pump body and the rotor structure; at least part of the gap seals adopts a conical sealing structure; the conical sealing structure has a conical sealing surface, and the directions of the conical sealing surfaces of all the conical sealing structures are consistent, so that the gap sizes of all the conical sealing structures can be compensated for wear by adjusting the axial installation position of the rotor structure.

[0008] Optionally, the pump body is provided with a water inlet end flow guide body corresponding to each water inlet end of the impeller, and a first gap seal is arranged between the water inlet end flow guide body and the impeller; a first conical sealing surface is arranged on the water inlet end flow guide body at the position of the first gap seal, a second conical sealing surface is arranged on the impeller, and the first conical sealing surface and the second conical sealing surface form a conical sealing structure; the directions of the conical sealing surfaces of all the first gap seals are the same.

[0009] Optionally, the pump body is provided with a guide vane body corresponding to each stage of impeller at the water outlet end, and a second gap seal is arranged between the guide vane body and the shaft sleeve on the pump shaft; at the position of the second gap seal, a third tapered sealing surface is arranged on the guide vane body, and a fourth tapered sealing surface is arranged on the shaft sleeve on the pump shaft, the third tapered sealing surface and the fourth tapered sealing surface cooperatively form a tapered sealing structure; the tapered sealing surfaces of each second gap seal are in the same direction as the tapered sealing surface of the first gap seal.

[0010] Optionally, the water inlet end flow guide body is provided with a first wear-resistant part at the position of the first gap seal, and the first tapered sealing surface is arranged on the first wear-resistant part.

[0011] The impeller is provided with a second wear-resistant part at the position of the first gap seal, and the second tapered sealing surface is arranged on the second wear-resistant part.

[0012] Optionally, the first wear-resistant part is an independent part independent of the main structure of the water inlet end flow guide body; and the second wear-resistant part is integrally arranged on the impeller.

[0013] Optionally, the guide vane body is provided with a third wear-resistant part at the position of the second gap seal, and the third tapered sealing surface is arranged on the third wear-resistant part.

[0014] The shaft sleeve on the pump shaft is provided with a fourth wear-resistant part at the position of the second gap seal, and the fourth tapered sealing surface is arranged on the fourth wear-resistant part.

[0015] Optionally, the third wear-resistant part is an independent part independent of the main structure of the guide vane body; and the fourth wear-resistant part is an independent part independent of the main structure of the shaft sleeve.

[0016] Optionally, all the sealing surfaces of the gap seals between the pump body and the rotor structure are tapered sealing surfaces.

[0017] Optionally, the multi-stage impeller is a centrifugal pump impeller or a mixed flow pump impeller.

[0018] Optionally, an adjustable connecting structure is arranged between the rotor structure and the pump body, and the adjustable connecting structure allows the rotor structure to adjust its assembly position in the axial direction.

[0019] The application provides a multi-stage pump, a plurality of gap seals are arranged between a pump body and a rotor structure; at least part of the gap seals adopts a conical sealing structure; the conical sealing structure has a conical sealing surface, and the directions of the conical sealing surfaces of all the conical sealing structures are consistent. Therefore, when the gap gradually increases due to wear during use of the pump, the wear of all the conical sealing structures can be compensated by adjusting the axial installation position of the rotor structure, without replacing relevant components (for example, an impeller), and the maintenance cost is lower. BRIEF DESCRIPTION OF DRAWINGS

[0020] Figure 1 is a structural schematic diagram of a multi-stage pump in an embodiment of the application.

[0021] Figure 2 is a partial structural schematic diagram of a multi-stage pump in an embodiment of the application.

[0022] Figure 3 is a structural schematic diagram of a multi-stage pump at a first gap seal in an embodiment of the application.

[0023] Figure 4 is a structural schematic diagram of a multi-stage pump at a second gap seal in an embodiment of the application.

[0024] Reference signs: pump body 10, internal space 11, water inlet 12, water outlet 13, water inlet end flow guide 14, first wear-resistant part 141, first conical sealing surface 142, guide vane body 15, third wear-resistant part 151, third conical sealing surface 152, rotor structure 20, pump shaft 21, shaft sleeve 211, fourth wear-resistant part 212, fourth conical sealing surface 213, impeller 22, second wear-resistant part 221, second conical sealing surface 222, first gap seal P1, second gap seal P2. DETAILED DESCRIPTION

[0025] The following is a specific embodiment of the application and further describes the technical solutions of the application in combination with the drawings, but the 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 application. Therefore, those skilled in the art should understand that various changes and modifications can be made to the embodiments described herein without departing from the scope of protection of the application. In addition, in order to be clear and concise, the description of known functions and structures is omitted.

[0026] It should be noted that the embodiments and features in the embodiments can be combined with each other without conflict.

[0027] It should be noted that in operation, due to natural wear, solid particles in the medium, impeller shaking and other reasons, the radial clearance between the impeller and the pump body becomes larger or the seal ring breaks, which cannot play a sealing role and can cause a large amount of backflow, reducing the actual flow of the pump. Therefore, in the internal structure of the multi-stage pump, the gap sealing structure between the pump body and the rotor structure will gradually increase due to wear during use of the pump, resulting in sealing failure. Therefore, the sealing structure of the multi-stage pump is improved, and an adjustable repair type multi-stage pump is provided.

[0028] In the embodiment of the application, the multi-stage pump comprises a pump body and a rotor structure; the pump body is provided with an internal space, and an inlet and an outlet. The rotor structure comprises 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; the rotor structure is assembled on the pump body and can be adjusted in the axial direction of the pump shaft. Among them, a plurality of gap seals are arranged between the pump body and the rotor structure; at least part of the gap seals adopt a conical sealing structure; the conical sealing structure has a conical sealing surface, and the directions of the conical sealing surfaces of all the conical sealing structures are consistent, so that the gap sizes of all the conical sealing structures can be compensated for wear by adjusting the axial mounting position of the rotor structure.

[0029] The multi-stage pump can adopt a centrifugal pump or a mixed flow pump, therefore, the multi-stage impeller can be provided as a centrifugal pump impeller or a mixed flow pump impeller. Among them, the centrifugal pump works by rotating the impeller to make the 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 the water to rotate at 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 pump pressure pipeline through the flow channel of the volute pump shell. The mixed flow pump has both centrifugal force and axial thrust on the liquid during the working process of the impeller. In a specific technical scheme, the multi-stage pump is a multi-stage centrifugal pump, and the multi-stage impellers are all centrifugal pump impellers. When working, the liquid delivered enters the pump body through the 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 deliver the liquid to the inlet of the next stage of the impeller under favorable hydraulic characteristics, each stage increases the same pressure, and after passing through the last stage of the guide vane, it is discharged from the outlet. The water pressure of the multi-stage centrifugal pump is the superposition of each stage of the impeller, so a larger outlet pressure can be obtained.

[0030] 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 a plurality of gap seals at different positions, which play a sealing role by utilizing the small gap between the rotor structure and the pump body.

[0031] In an embodiment of the present application, all the sealing surfaces of the gap seals between the pump body 10 and the rotor structure 20 are tapered sealing surfaces.

[0032] With reference to Figures 1-4 , the multi-stage pump comprises a pump body 10 and a rotor structure 20. The pump body 10 is provided with an internal space 11, as well as a water inlet 12 and a water outlet 13. The rotor structure 20 comprises a pump shaft 21 and multi-stage impellers 22. The pump shaft 21 is arranged in the internal space 11 of the pump body 10, and the multi-stage impellers 22 are arranged on the pump shaft 21 in sequence. The rotor structure 20 is assembled on the pump body 10 and can be adjusted in the axial direction of the pump shaft 21. A plurality of gap seals are arranged between the pump body 10 and the rotor structure 20. The gap seals adopt tapered sealing structures. The tapered sealing structures have tapered sealing surfaces, and the directions of the tapered sealing surfaces of all the tapered sealing structures are consistent, so that the gap sizes of all the tapered sealing structures can be compensated by adjusting the axial installation position of the rotor structure 20.

[0033] With reference to Figure 1 , the pump body 10 is provided with water inlet end flow guides 14 corresponding to the water inlet ends of the impellers 22. The first gap seals P1 are arranged between the water inlet end flow guides 14 and the impellers 22. The first tapered sealing surfaces 142 are arranged on the water inlet end flow guides 14 at the positions of the first gap seals P1, and the second tapered sealing surfaces 222 are arranged on the impellers 22. The first tapered sealing surfaces 142 and the second tapered sealing surfaces 222 cooperatively form tapered sealing structures. The directions of the tapered sealing surfaces of the first gap seals P1 are the same.

[0034] With reference to Figure 1 , the pump body 10 is provided with guide vane bodies 15 corresponding to the water outlet ends of the impellers 22. The second gap seals P2 are arranged between the guide vane bodies 15 and the shaft sleeves 211 on the pump shaft 21. The third tapered sealing surfaces 152 are arranged on the guide vane bodies 15 at the positions of the second gap seals P2, and the fourth tapered sealing surfaces 213 are arranged on the shaft sleeves 211 on the pump shaft 21. The third tapered sealing surfaces 152 and the fourth tapered sealing surfaces 213 cooperatively form tapered sealing structures. The directions of the tapered sealing surfaces of the second gap seals P2 are the same as those of the first gap seals P1.

[0035] The gap seals between the pump body 10 and the rotor structure 20 comprise the first gap seals P1 and the second gap seals P2. Figures 2-4 The structure at the first-stage impeller is shown, which comprises the first gap seals P1 and the second gap seals P2.

[0036] With reference to Figure 2 and Figure 3The water inlet end flow guide 14 is arranged on the pump body 10, the first tapered sealing surface 142 is arranged on the water inlet end flow guide 14, the second tapered sealing surface 222 is arranged on the impeller 22, and the first tapered sealing surface 142 and the second tapered sealing surface 222 cooperatively form the tapered first gap seal P1. When the water inlet end flow guide 14 or the impeller 22 is excessively worn, the gap between the first tapered sealing surface 142 and the second tapered sealing surface 222 is increased, and the first gap seal P1 is lost. During maintenance, the gap between the first tapered sealing surface 142 and the second tapered sealing surface 222 can be reduced by adjusting the axial installation position of the rotor structure 20, the gap of the first gap seal P1 is compensated for wear, and the sealing function of the first gap seal P1 is restored.

[0037] With reference to Figure 2 and Figure 4 The guide vane body 15 is arranged on the pump body 10, the third tapered sealing surface 152 is arranged on the guide vane body 15, the fourth tapered sealing surface 213 is arranged on the shaft sleeve 211 of the pump shaft 21, and the third tapered sealing surface 152 and the fourth tapered sealing surface 213 cooperatively form the tapered second gap seal P2. When the guide vane body 15 or the shaft sleeve 211 of the pump shaft 21 is excessively worn, the gap between the third tapered sealing surface 152 and the fourth tapered sealing surface 213 is increased, and the second gap seal P2 is lost. During maintenance, the gap between the third tapered sealing surface 152 and the fourth tapered sealing surface 213 can be reduced by adjusting the axial installation position of the rotor structure 20, the gap of the second gap seal P2 is compensated for wear, and the sealing function of the second gap seal P2 is restored.

[0038] It should be noted that the tapered sealing surfaces of each second gap seal P2 are in the same direction as the tapered sealing surfaces of the first gap seal P1, that is, the first tapered sealing surface 142 and the second tapered sealing surface 222, and the third tapered sealing surface 152 and the fourth tapered sealing surface 213 are in the same direction. Therefore, during maintenance, the gap between the first tapered sealing surface 142 and the second tapered sealing surface 222 and the gap between the third tapered sealing surface 152 and the fourth tapered sealing surface 213 can be reduced by adjusting the axial installation position of the rotor structure 20.

[0039] In an embodiment of the present application, the first wear-resistant part 141 is arranged on the impeller 22 at the position of the first gap seal P1, and the second tapered sealing surface 222 is arranged on the first wear-resistant part 141. Further, the first wear-resistant part 141 is an independent part independent of the main structure of the impeller 22. Here, the first wear-resistant part 141 and the second wear-resistant part 221 are both wear-resistant structures, which can increase the service life of the first gap seal P1.

[0040] In an embodiment of the present application, the third wear-resistant part 151 is arranged on the vane body 15 at the position of the second gap seal P2, and the third tapered sealing surface 152 is arranged on the third wear-resistant part 151. Further, the fourth wear-resistant part 212 is arranged on the shaft sleeve 211 of the pump shaft 21 at the position of the second gap seal P2, and the fourth tapered sealing surface 213 is arranged on the fourth wear-resistant part 212. Here, the third wear-resistant part 151 and the fourth wear-resistant part 212 are both wear-resistant structures, which can increase the service life of the second gap seal P2.

[0041] In the embodiment of the present application, the adjustable connection structure is arranged between the rotor structure 20 and the pump body 10, and the adjustable connection structure allows the rotor structure 20 to adjust its assembly position in the axial direction. In this design, the adjustable connection structure can be used to adjust the axial installation position of the rotor structure.

[0042] The multi-stage pump provided in the embodiments of the present application has a plurality of gap seals arranged between the pump body and the rotor structure. At least part of the gap seals adopts a tapered sealing structure. The tapered sealing structure has a tapered sealing surface, and the directions of the tapered sealing surfaces of all the tapered sealing structures are consistent. Therefore, when the gap gradually increases due to wear during use of the pump, the gap size of all the tapered sealing structures can be compensated for wear by adjusting the axial installation position of the rotor structure, without the need to replace relevant components (e.g., the impeller), thereby reducing maintenance costs.

[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] Moreover, the terms "first", "second", etc. are used herein only to describe different instances, and do not imply or suggest relative importance or a number of indicated technical features. Thus, the features defined with "first", "second" can include at least one of the features explicitly or implicitly. In the description of the present application, the meaning of "a plurality of" is at least two, for example, two, three, etc., unless otherwise explicitly and 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, the singular form is intended to include the plural form, unless the context clearly indicates otherwise, and it should also be understood that, when the terms "comprise" and / or "include" are used in the specification, there is a presence of the features, steps, operations, devices, components and / or combinations thereof.

[0045] The specific embodiments described herein merely illustrate the techniques of the present application. Various modifications or supplements or replacements of the specific embodiments described herein can be made by those skilled in the art of the present application, or similar ways can be adopted, without departing from the scope defined by the claims of the present application.

Claims

1. An adjustable repairable multi-stage pump, characterized by, The adjustable repairable multi-stage pump comprises: a pump body provided with an internal space, an inlet and an outlet; a rotor structure comprising a pump shaft and multi-stage impellers, the pump shaft being arranged in the internal space of the pump body, and the multi-stage impellers being arranged on the pump shaft in sequence, the rotor structure being assembled on the pump body and capable of adjusting the assembly position in the axial direction of the pump shaft; wherein a plurality of gap seals are arranged between the pump body and the rotor structure, at least part of the gap seals adopting a conical sealing structure, the conical sealing structure being provided with a conical sealing surface, and the directions of the conical sealing surfaces of all the conical sealing structures being consistent, so that the gap sizes of all the conical sealing structures can be compensated by adjusting the axial assembly position of the rotor structure.

2. The adjustable repairable multi-stage pump of claim 1, wherein, The pump body is provided with an inlet end flow guide corresponding to each stage of impeller, and a first gap seal is arranged between the inlet end flow guide and the impeller; at the position of the first gap seal, a first conical sealing surface is arranged on the inlet end flow guide, and a second conical sealing surface is arranged on the impeller, the first conical sealing surface and the second conical sealing surface cooperating to form a conical sealing structure; the directions of the conical sealing surfaces of all the first gap seals are the same.

3. The adjustable repairable multi-stage pump of claim 2, wherein, The pump body is provided with a guide vane corresponding to each stage of impeller, and a second gap seal is arranged between the guide vane and the shaft sleeve on the pump shaft; at the position of the second gap seal, a third conical sealing surface is arranged on the guide vane, and a fourth conical sealing surface is arranged on the shaft sleeve on the pump shaft, the third conical sealing surface and the fourth conical sealing surface cooperating to form a conical sealing structure; the directions of the conical sealing surfaces of all the second gap seals are the same as those of the first gap seals.

4. The adjustable repairable multi-stage pump according to claim 3, wherein the inlet end flow guide is provided with a first wear-resistant part at the position of the first gap seal, and the first conical sealing surface is arranged on the first wear-resistant part; the impeller is provided with a second wear-resistant part at the position of the first gap seal, and the second conical sealing surface is arranged on the second wear-resistant part.

5. The adjustable repairable multi-stage pump of claim 4, wherein, the first wear-resistant part is an independent part independent of the main structure of the inlet end flow guide; and the second wear-resistant part is integrally arranged on the impeller.

6. The adjustable repairable multi-stage pump according to claim 3, wherein the guide vane is provided with a third wear-resistant part at the position of the second gap seal, and the third conical sealing surface is arranged on the third wear-resistant part; the shaft sleeve on the pump shaft is provided with a fourth wear-resistant part at the position of the second gap seal, and the fourth conical sealing surface is arranged on the fourth wear-resistant part.

7. The adjustable repairable multi-stage pump of claim 6, wherein, the third wear-resistant part is an independent part independent of the main structure of the guide vane; and the fourth wear-resistant part is an independent part independent of the main structure of the shaft sleeve.

8. The adjustable repairable multi-stage pump of claim 1, wherein, the sealing surfaces of all the gap seals between the pump body and the rotor structure are conical sealing surfaces.

9. The adjustable repairable multi-stage pump of claim 1, wherein, the multi-stage impeller is a centrifugal pump impeller or a mixed flow pump impeller.

10. The adjustable repairable multistage pump of claim 1, wherein, an adjustable connecting structure is arranged between the rotor structure and the pump body, and the adjustable connecting structure allows the rotor structure to adjust the assembly position in the axial direction.

Images