Adjustable repair type self-balancing multi-stage pump

Abstract

The utility model provides an adjustable repair type self-balancing multi-stage pump, and relates to the technical field of multi-stage pumps, in the internal space of a pump body, a first annular support and a second annular support are arranged on a drainage section of the pump body; a balance body is arranged on the rotor structure; the first support wraps the balance body, and a first gap is formed between the first support and the balance body. A second gap is formed between the second support and the balance body; a balance cavity is defined by the balance body and the inner structure of the pump body. The first gap is communicated with a water outlet of the multi-stage impeller and the balance cavity; the second gap communicates the interior and exterior of the balance cavity for pressure relief of the balance cavity; the matching surfaces, used for forming the first gap, on the first support and the balance body are conical; and a matching surface for forming the second gap on the second support and the balance body is a radial end surface. Abrasion compensation can be carried out on the size of the gap 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 self-balancing 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 working condition of the multi-stage pump, the axial force of the rotor structure changes with the working condition. The axial force of the traditional pump is borne by the motor bearing, which can cause the motor to heat, reduce the efficiency of the unit, increase the energy consumption of the equipment, and cause the motor bearing to be easily damaged, and also cause the motor coil insulation layer to age prematurely. The higher the working pressure of the pump, the more prominent this phenomenon.

[0003] In the internal structure of the multi-stage pump, a self-balancing mechanism is often arranged to balance the axial force of the rotor structure. Chinese patent CN 203023143 U discloses a multi-stage pump self-balancing structure. The multi-stage pump structure disclosed in the patent document balances the axial force of the rotor structure by means of the self-balancing structure. However, such self-balancing structure relies on the gap seal between the pump body and the rotor structure, and the gap seal structure between the pump body and the rotor structure will be worn out with the use of the pump, causing the gap to gradually increase, resulting in seal failure. After wear and tear, the related parts need to be replaced, which is inconvenient to maintain and has high maintenance cost. CONTENT OF THE UTILITY MODEL

[0004] The technical problem to be solved by the present application is to provide an adjustable repair type self-balancing multi-stage pump to solve the above problems in the prior art.

[0005] An adjustable repair type self-balancing multi-stage pump, comprising: a pump body

[0006] The pump body has a water inlet section, a middle section and a water outlet section.

[0007] The rotor structure comprises 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 rotor structure is assembled on the pump body and can adjust the assembly position in the axial direction of the pump shaft.

[0008] In the inner space of the pump body, a first support and a second support are arranged on the drainage section of the pump body; a balance body is arranged on the rotor structure; the first support is wrapped around the outer periphery of the balance body, and a first gap is formed between the first support and the balance body; a second gap is formed between the second support and the balance body; a balance cavity is formed by the balance body and the inner structure of the pump body; the first gap is connected to the drainage port of the multi-stage impeller and the balance cavity; the second gap is connected to the inside and outside of the balance cavity for pressure relief of the balance cavity; wherein the matching surfaces of the first support and the balance body for forming the first gap are conical; and the matching surfaces of the second support and the balance body for forming the second gap are radial end surfaces.

[0009] Optionally, an annular throttling body is further arranged on the rotor structure; a third gap is formed between the annular throttling body and the second support; a secondary balance cavity is formed between the annular throttling body and the second support; the second gap is connected to the balance cavity and the secondary balance cavity; the third gap is connected to the inside and outside of the secondary balance cavity for pressure relief of the secondary balance cavity; the matching surfaces of the annular throttling body and the second support for forming the third gap are conical and have the same direction as the matching surfaces of the first gap.

[0010] Optionally, one end of the third gap is connected to the secondary balance cavity, and the other end is connected to the water inlet section of the pump body.

[0011] Optionally, the matching surfaces of the first support for forming the first gap are concave-convex surfaces.

[0012] Optionally, a plurality of groove structures are uniformly and spacedly distributed on the matching surfaces of the first support for forming the first gap, so as to form concave-convex surfaces.

[0013] Optionally, the first support is a hollow sleeve body fixed to the drainage section of the pump body and mounted in a detachable manner.

[0014] Optionally, the second support is a detachable annular structure.

[0015] Optionally, the balance body and the annular throttling body are fixed together with the pump shaft through a shaft sleeve.

[0016] Optionally, the multi-stage impeller is arranged as a centrifugal pump impeller or a mixed-flow pump impeller.

[0017] 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.

[0018] In the present application, a first support and a second support in annular shape are arranged on the drainage section of the pump body in the inner space of the pump body; a balance body is arranged on the rotor structure; the first support is wrapped around the outer periphery of the balance body, and a first gap is formed between the first support and the balance body, the first gap being connected to the drainage port of the multi-stage impeller and the balance cavity, for guiding the high-pressure water in the drainage port to enter the balance cavity, and the high-pressure water in the balance cavity acting on the balance body to balance the axial force of the rotor structure. Moreover, the matching surfaces of the first support and the balance body for forming the first gap are arranged in a tapered shape, so that when the gap gradually increases due to wear during use of the pump, the size of the gap can be compensated for wear by adjusting the axial installation position of the rotor structure, without the need to replace relevant components, and the maintenance cost is lower. BRIEF DESCRIPTION OF DRAWINGS

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

[0020] Figure 2 is a partial structural schematic diagram of a self-balancing multi-stage pump in the embodiments of the present application.

[0021] Figure 3 is a structural schematic diagram of a self-balancing multi-stage pump at the first gap in the embodiments of the present application.

[0022] Reference signs: pump body 10, water inlet section 11, middle section 12, drainage section 13, first support 14, groove structure 141, second support 15, rotor structure 20, pump shaft 21, impeller 22, balance body 23, annular throttling body 24, balance cavity 31, first gap 32, second gap 33, secondary balance cavity 34, third gap 35. DETAILED DESCRIPTION

[0023] The following is a specific embodiment of the present application and further describes 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.

[0024] It should be noted that the embodiments and features in the embodiments of the present application can be combined with each other without conflict.

[0025] It should be noted that in the internal structure of the multi-stage pump, a self-balancing mechanism is often provided to balance the axial force of the rotor structure, and the balance structure relies on the gap seal between the pump body and the rotor structure. The gap seal structure between the pump body and the rotor structure will wear out with the use of the pump, causing the gap to gradually increase, resulting in seal failure. Therefore, the embodiment of the present application provides a self-balancing multi-stage pump with adjustable repair function, which can compensate for wear by adjusting the axial installation position of the rotor structure. The related parts do not need to be replaced, and the maintenance cost is lower.

[0026] Reference Figure 1 The self-balancing multi-stage pump comprises a pump body 10 and a rotor structure 20, wherein the pump body 10 has a water inlet section 11, a middle section 12 and a water outlet section 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 of the pump body 10, and the multi-stage impellers 22 are arranged on the pump shaft 21 in sequence; and the rotor structure 20 is assembled on the pump body 10 and can be adjusted in the axial installation position along the pump shaft 21.

[0027] The multi-stage impeller is provided as a centrifugal pump impeller or a mixed flow pump impeller. Therefore, the multi-stage impeller can be provided as a centrifugal pump impeller or a mixed flow pump impeller. 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, and then the motor is started to drive the pump shaft to rotate the impeller and the water 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 operation. In a specific technical solution, the multi-stage pump is a multi-stage centrifugal pump, and the multi-stage impeller is a centrifugal pump impeller. When working, the liquid delivered through the water inlet enters the inside of the pump body. 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, and 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 stages of the impeller, so a larger outlet pressure can be obtained.

[0028] 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 utilize the small gap between the rotor structure and the pump body for sealing.

[0029] Continuing to refer to Figure 2 and Figure 3In the internal space of the pump body 10, an annular first support 14 and a second support 15 are provided on the drainage section 13 of the pump body 10; a balance body 23 is provided on the rotor structure 20; the first support 14 covers the outer periphery of the balance body 23, forming a first gap 32 between the first support 14 and the balance body 23; a second gap 33 is formed between the second support 15 and the balance body 23; a balance cavity 31 is formed by the balance body 23 and the internal structure of the pump body 10; the first gap 32 connects the drainage port of the multi-stage impeller and the balance cavity 31; the second gap 33 connects the inside and outside of the balance cavity 31 for pressure relief of the balance cavity 31; wherein, the mating surfaces on the first support 14 and the balance body 23 for forming the first gap 32 are set as conical; the mating surfaces on the second support 15 and the balance body 23 for forming the second gap 33 are radial end faces.

[0030] The first gap 32 connects the drain outlet of the multi-stage impeller and the balance chamber 31. High-pressure water from the drain outlet can enter the balance chamber 31 through the first gap 32, and water in the balance chamber 31 can leak through the second gap 33. Based on Figures 1-3 As shown in the diagram, when the pump is working, the impeller 22 of the rotor structure 20 is subjected to an axial force to the left, and the balance body 23 is subjected to an axial force to the right to balance the force on the impeller 22. The axial force of the rotor structure changes continuously with the operating conditions. When the rotor structure 20 is subjected to force and moves to the right along the axial direction, the balance body 23 moves closer to the second support 15, the second gap 33 decreases, the leakage of the balance chamber 31 decreases, and the water pressure increases. This increases the leftward pressure of the liquid in the balance chamber 31 acting on the balance body 23, thereby changing the force direction of the rotor structure 20 to the left. At this time, as the force direction of the entire rotor structure 20 changes to the left, the rotor structure 20 moves to the left. When the rotor structure 20 is subjected to force and moves axially to the left, the balance body 23 moves away from the second support 15, the second gap 33 increases, the leakage of the balance chamber 31 increases, and the water pressure decreases. This reduces the leftward pressure exerted by the liquid in the balance chamber 31 on the balance body 23, thereby changing the direction of force on the rotor structure 20 to the right. At this time, as the direction of force on the entire rotor structure 20 changes to the right, the rotor structure 20 moves to the right. Therefore, when the rotor structure 20 moves axially under force, the force on the rotor structure 20 will reverse as the size of the second gap 33 changes, causing the rotor structure 20 to move in the opposite direction. In this way, the rotor structure 20 can maintain dynamic balance.

[0031] The mating surfaces on the first support 14 and the balance body 23 used to form the first gap 32 are set in a conical shape. Therefore, when the mating surfaces on both sides of the first gap 32 are worn, the wear compensation of the gap size of the first gap 32 can be achieved by adjusting the axial installation position of the rotor structure 20 as a whole. Furthermore, there is no need to replace the relevant parts, resulting in lower maintenance costs.

[0032] Reference will be made to Figure 2 And Figure 3 In an embodiment of the present application, the rotor structure 20 is further provided with an annular throttle body 24; the third gap 35 is formed between the annular throttle body 24 and the second support 15; the secondary balance cavity 34 is formed between the annular throttle body 24 and the second support 15; the second gap 33 communicates the balance cavity 31 and the secondary balance cavity 34; the third gap 35 communicates the inside and outside of the secondary balance cavity 34 for pressure relief of the secondary balance cavity 34; the matching surface of the annular throttle body 24 and the second support 15 for forming the third gap 35 is tapered and has the same direction as the matching surface of the first gap.

[0033] Specifically, when the rotor structure 20 moves axially to the right, the annular throttle body 24 on the rotor structure 20 moves away from the second support 15, the third gap 35 becomes larger, the leakage of the secondary balance cavity 34 increases, the pressure decreases, and the force on the annular throttle body 24 changes to the left to resist the movement of the rotor structure 20. When the rotor structure 20 moves axially to the left, the annular throttle body 24 on the rotor structure 20 moves close to the second support 15, the third gap 35 becomes smaller, the leakage of the secondary balance cavity 34 decreases, the pressure increases, and the force on the annular throttle body 24 changes to the right to resist the movement of the rotor structure 20. Further, the matching surface of the annular throttle body 24 and the second support 15 for forming the third gap 35 is tapered and has the same direction as the matching surface of the first gap. Therefore, when the gap gradually increases due to wear during use of the pump, wear compensation can be achieved for the first gap 32 and the third gap 35 by adjusting the axial installation position of the rotor structure, without the need to replace related parts, thereby reducing maintenance costs.

[0034] Further, one end of the third gap 35 communicates to the secondary balance cavity 34, and the other end communicates to the water inlet section 11 of the pump body 10. Here, the water leaked from the self-balancing structure can return to the water inlet section 11.

[0035] Reference will be made to Figure 3 In an embodiment of the present application, the matching surface of the first support 14 for forming the first gap 32 is a concave-convex surface, and the concave-convex structure is arranged on the matching surface of the first gap 32, which can slow down the flow speed of the high-pressure water and reduce the leakage. Further, the matching surface of the first support 14 for forming the first gap 32 is uniformly and spacedly provided with a plurality of groove structures 141 to form a concave-convex surface. When the high-pressure water enters the groove structure 141, it diffuses and flows into the groove structure 141. When the high-pressure water flows out of the groove structure 141, it needs to flow again. Therefore, the high-pressure water needs to continuously diffuse and contract when passing through the groove structure 141, thereby slowing down the flow speed of the high-pressure water and reducing the leakage.

[0036] The first support 14 and the second support 15 are arranged on the pump body 10. In an embodiment of the present application, the first support 14 is a hollow sleeve fixed on the drainage section 13 of the pump body 10 and is detachably mounted. In an embodiment of the present application, the second support 15 is a detachable ring structure, as shown in Figure 2 The second support 15 is fixedly mounted by screws.

[0037] The balancing body 23 and the ring-shaped throttling body 24 are arranged on the rotor structure 20. In an embodiment, the balancing body 23 and the ring-shaped throttling body 24 are fixed together with the pump shaft 21 through a shaft sleeve.

[0038] In an embodiment of the present application, an adjustable connection structure is arranged between the rotor structure 20 and the pump body 10, which 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.

[0039] In summary, in the internal space of the pump body, the first support and the second support are arranged in a ring shape on the drainage section of the pump body; the balancing body is arranged on the rotor structure; the first support is wrapped around the outer periphery of the balancing body, and the first gap is formed between the first support and the balancing body, which is connected to the drainage port of the multi-stage impeller and the balancing cavity, and is used to guide the high-pressure water in the drainage port into the balancing cavity, so that the high-pressure water in the balancing cavity acts on the balancing body to balance the axial force of the rotor structure. Moreover, the matching surfaces of the first support and the balancing body for forming the first gap are arranged in a tapered shape, so that when the gap gradually increases due to wear during use of the pump, the size of the gap can be compensated for by adjusting the axial installation position of the rotor structure, without the need to replace related components, thereby reducing maintenance costs.

[0040] 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.

[0041] In addition, the terms "first", "second", "third", etc. are used only for descriptive purposes and should not be construed as indicating or implying relative importance or an indicated number of technical features. Therefore, the features defined as "first", "second", etc. 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, such as 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. Furthermore, it should be understood that when the terms "comprise" and / or "include" are used in the specification, they indicate the presence of the features, steps, operations, devices, components and / or combinations thereof.

[0042] The specific embodiments described herein are merely illustrative of the principles of this application. Numerous modifications and adaptations will be readily apparent to those skilled in the art of this application that do not depart from the scope of the application as defined in the claims below.

Claims

1. An adjustable repairable self-balancing multi-stage pump, characterized by, The utility model relates to a pump, comprising: a pump body; the pump body has a water inlet section, a middle section and a water outlet section; a rotor structure comprising a pump shaft and a plurality of impellers arranged in sequence on the pump shaft, the rotor structure being assembled on the pump body and capable of being adjusted in axial direction of the pump shaft; in the internal space of the pump body, a first annular support and a second annular support are arranged on the water outlet section of the pump body; a balance body is arranged on the rotor structure; the first annular support covers the outer periphery of the balance body, forming a first gap between the first annular support and the balance body; a second gap is formed between the second annular support and the balance body; a balance cavity is formed by the balance body and the internal structure of the pump body; the first gap is connected to the water outlet of the plurality of impellers and the balance cavity; the second gap is connected to the inside and outside of the balance cavity for pressure relief of the balance cavity; the mating surfaces of the first annular support and the balance body for forming the first gap are tapered; the mating surfaces of the second annular support and the balance body for forming the second gap are radial end surfaces.

2. The adjustable repairable self-balancing multi-stage pump of claim 1, wherein, an annular throttling body is further arranged on the rotor structure; a third gap is formed between the annular throttling body and the second annular support; a secondary balance cavity is formed between the annular throttling body and the second annular support; the second gap is connected to the balance cavity and the secondary balance cavity; the third gap is connected to the inside and outside of the secondary balance cavity for pressure relief of the secondary balance cavity; the mating surfaces of the annular throttling body and the second annular support for forming the third gap are tapered and have the same direction as the mating surfaces of the first gap.

3. The adjustable repairable self-balancing multi-stage pump of claim 2, wherein, one end of the third gap is connected to the secondary balance cavity, and the other end is connected to the water inlet section of the pump body.

4. The adjustable repairable self-balancing multi-stage pump of claim 1, wherein, the mating surfaces of the first annular support for forming the first gap are concave-convex surfaces.

5. The adjustable repairable self-balancing multi-stage pump of claim 4, wherein, a plurality of groove structures are uniformly and spacedly arranged on the mating surfaces of the first annular support for forming the concave-convex surfaces.

6. The adjustable repairable self-balancing multi-stage pump of claim 1, wherein, the first annular support is a hollow sleeve body fixed on the water outlet section of the pump body and mounted in a detachable manner.

7. The adjustable repairable self-balancing multi-stage pump of claim 1, wherein, the second annular support is a detachable annular structure.

8. The adjustable repairable self-balancing multi-stage pump of claim 2, wherein, the balance body and the annular throttling body are fixed to the pump shaft through shaft sleeves.

9. The adjustable repairable self-balancing multi-stage pump of claim 1, wherein, the plurality of impellers are centrifugal pump impellers or mixed-flow pump impellers.

10. The adjustable repairable self-balancing multi-stage pump of claim 1, wherein, an adjustable connecting structure is arranged between the rotor structure and the pump body, allowing the rotor structure to be adjusted in axial direction of the pump shaft.

Images