Drum self-balancing pump

Abstract

The utility model provides a kind of drum type self-balancing pump, it is related to pump technical field, including pump body, rotor structure;The water outlet section of pump body is provided with annular first support, second support, third support;Rotor structure is provided with balance body;First support is covered in the outer periphery of balance body, and, around rotor structure circumferentially a circle is formed between first support and balance body first gap;Second support is located in the side of balance body away from impeller, around rotor structure circumferentially a circle is formed between second support and rotor structure second gap;Third support is located in the side of balance body close to impeller, around rotor structure circumferentially a circle is formed between third support and rotor structure third gap;Third gap communicates the drainage end of impeller and first gap;Third gap is more close to the rotation axis of rotor structure compared to first gap.The technical scheme of the application can improve the reliability of the balance structure.

Description

Technical Field

[0001] This application relates to the field of pump technology, and in particular to a drum-type self-balancing pump. Background Technology

[0002] Pumps are machines that transport or pressurize fluids, and are used in many industrial sectors such as petroleum, chemical, machinery, mining, light industry, pharmaceuticals, and food. During operation, the axial force on the rotor structure of a pump constantly changes with the operating conditions. In traditional pumps, this axial force is borne by the motor bearings, which can cause the motor to overheat, reducing unit efficiency, increasing energy consumption, and making the motor bearings more susceptible to damage. It can also cause premature aging of the motor coil insulation. This phenomenon becomes more pronounced as the pump's operating pressure increases.

[0003] In the internal structure of pumps, a self-balancing mechanism is often incorporated to balance the axial force on the rotor structure. Chinese patent CN202510527174.1 discloses a repairable self-balancing multistage pump. In the multistage pump structure disclosed in this patent document, the axial force on the rotor structure is balanced by a self-balancing structure. However, the self-balancing structure relies on the gap seal between the pump body and the rotor structure. As the pump is used, the gap seal will wear down, causing the gap to gradually increase. In high-pressure environments, the wear intensifies, making it easier for the rotor structure to be jammed by the high-pressure fluid inside the pump, thus losing its balancing function. Utility Model Content

[0004] The technical problem to be solved by this application is to propose a drum-type self-balancing pump to address the above-mentioned shortcomings of the prior art.

[0005] A drum-type self-balancing pump, the drum-type self-balancing pump comprising:

[0006] The pump body has an inlet section, a middle section, and an outlet section;

[0007] The rotor structure includes a pump shaft and an impeller; the pump shaft passes through the internal space of the pump body, and the impeller is arranged on the pump shaft;

[0008] The pump body is provided with annular first, second, and third supports on the water outlet section; the rotor structure is provided with a balancing body;

[0009] The first support covers the periphery of the balance body, and a first gap is formed between the first support and the balance body around the circumference of the rotor structure.

[0010] The second support is located on the side of the balance body away from the impeller, and a second gap is formed between the second support and the rotor structure around the circumference of the rotor structure;

[0011] The third support is located on the side of the balance body closer to the impeller, and a third gap is formed between the third support and the rotor structure around the circumference of the rotor structure.

[0012] A balancing cavity is formed between the first gap and the second gap; the second gap connects the inside and outside of the balancing cavity to facilitate pressure relief of the balancing cavity;

[0013] The third gap connects the drain end of the impeller and the first gap; the third gap is closer to the rotation axis of the rotor structure than the first gap.

[0014] Optionally, the third support includes a support body and a wear-resistant sleeve; the support body is fixedly assembled inside the pump body; the wear-resistant sleeve is assembled on the support body through a threaded connector; the third gap is formed by the wear-resistant sleeve and the rotor structure.

[0015] Optionally, the rotor structure is further provided with a secondary balancing body, which is located on the side of the second support away from the impeller; a fourth gap is formed between the secondary balancing body and the second support;

[0016] A secondary balancing cavity is formed between the secondary balancing body and the second support; the second gap connects the balancing cavity and the secondary balancing cavity; the fourth gap connects the inside and outside of the secondary balancing cavity and is used for depressurization of the secondary balancing cavity.

[0017] Optionally, the second gap is formed by the cooperation of the second support and the balancing body.

[0018] Optionally, the mating surface on the first support for forming the first gap is a concave-convex surface.

[0019] Optionally, the first support has a plurality of groove structures evenly spaced on the mating surface used to form the first gap, so as to form a concave-convex surface.

[0020] Optionally, the first support is a hollow sleeve fixed to the water outlet section of the pump body and is assembled in a detachable manner.

[0021] Optionally, both the second support and the third support are assembled in a detachable manner.

[0022] Optionally, the rotor structure is provided with multi-stage impellers.

[0023] Optionally, the impeller is specifically configured as a centrifugal pump impeller or a mixed-flow pump impeller.

[0024] In this application, a third gap is provided before the first gap. The high-pressure water from the impeller's drainage end needs to enter the first gap through the third gap. The third gap allows the water flow to pass through the first gap more evenly, avoiding the formation of stagnant water due to slow local flow in the first gap, which would cause local heat accumulation. This improves the heat dissipation capacity of the water flow in the first gap, reduces the generation of bubbles, and increases the reliability of the balance structure. In addition, the third gap is closer to the rotation axis of the rotor structure than the first gap, has a smaller radius, and has less impact on the water flow rate during wear. Attached Figure Description

[0025] Figure 1 This is a schematic diagram of the structure of the drum self-balancing pump in the embodiments of this application.

[0026] Figure 2 yes Figure 1 A magnified view of a portion of the image.

[0027] Figure 3 yes Figure 1 Another enlarged view of a portion of the image.

[0028] Reference numerals: Pump body 10, First support 11, Groove structure 111, Second support 12, Third support 13, Support body 131, Wear-resistant sleeve 132, Rotor structure 20, Pump shaft 21, Impeller 22, Balance body 23, Secondary balance body 24, First gap 31, Second gap 32, Third gap 33, Fourth gap 34, Balance chamber 35, Secondary balance chamber 36. Detailed Implementation

[0029] The following are specific embodiments of this application, described in conjunction with the accompanying drawings, to further illustrate the technical solutions of this application. However, this application is not limited to these embodiments. In the following description, specific details such as particular configurations and components are provided merely to aid in a comprehensive understanding of the embodiments of this 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 this application. Furthermore, for clarity and brevity, descriptions of known functions and structures have been omitted.

[0030] It should be noted that, unless otherwise specified, the embodiments and features described in this application can be combined with each other.

[0031] A pump comprises a pump body and a rotor structure, and can balance the axial forces on the rotor structure using a self-balancing structure. However, the self-balancing structure relies on the gap seal between the pump body and the rotor structure. This gap seal wears down with pump use, causing the gap to gradually increase. In high-pressure environments, this wear intensifies, increasing the internal volume of the gap. This increased wear makes it easier for the rotor structure to be jammed by the high-pressure fluid inside the pump, resulting in loss of balance. Therefore, this application provides a drum-type self-balancing pump, improving upon existing self-balancing pumps to better adapt to high-pressure environments.

[0032] refer to Figures 1-3 The drum-type self-balancing pump includes a pump body 10 and a rotor structure 20. The pump body 10 has an inlet section, a middle section, and an outlet section. The rotor structure 20 includes a pump shaft 21 and an impeller 22; the pump shaft 21 passes through the internal space of the pump body 10, and the impeller 22 is arranged on the pump shaft 21.

[0033] In one embodiment of this application, the rotor structure 20 is provided with multi-stage impellers 22. The multi-stage impellers are configured as centrifugal pump impellers or mixed-flow pump impellers. Therefore, the multi-stage impellers can be configured as centrifugal pump impellers or mixed-flow pump impellers. Centrifugal pumps operate by using the rotation of the impeller to cause centrifugal motion of water. Before starting, the pump body and suction pipe are filled with water. Then, the motor is started, causing the pump shaft to drive the impeller and water to rotate at high speed. The water undergoes centrifugal motion, being thrown towards the outer edge of the impeller and flowing into the pump's discharge pipe through the flow channel of the volute casing. During operation, the mixed-flow pump's impeller rotation exerts both centrifugal force and axial thrust on the liquid. In a specific technical solution, the multi-stage pump is a multi-stage centrifugal pump, and all multi-stage impellers are centrifugal pump impellers. During operation, the pumped liquid enters the pump body through the inlet. Due to the action of the impeller, both the kinetic and potential energy of the liquid increase. After entering the guide vanes, some of the kinetic energy is converted into potential energy (each impeller stage is equipped with a guide vane). The counter-rotating blades of the guide vanes, under favorable hydraulic characteristics, transport the liquid to the inlet of the next stage impeller. Each stage increases the pressure by the same amount. After passing through the final stage guide vane, the liquid is discharged from the outlet. The water pressure of a multistage centrifugal pump is the superposition of each impeller stage, thus achieving a larger outlet pressure.

[0034] Additionally, it should be noted that the rotor structure is the rotating part within the pump body, including the pump shaft, multi-stage impellers, and other components that rotate with the pump shaft. Multiple gap seals are installed at different locations within the rotor structure and pump body, utilizing the minute gaps between them for sealing.

[0035] The pump body 10 has annular first supports 11, second supports 12, and third supports 13 on its outlet section; a counterweight 23 is provided on the rotor structure 20. The first support 11 covers the outer periphery of the counterweight 23, and a first gap 31 is formed between the first support 11 and the counterweight 23 around the rotor structure 20. The second support 12 is located on the side of the counterweight 23 away from the impeller 22, and a second gap 32 is formed between the second support 12 and the rotor structure 20 around the rotor structure 20. The third support 13 is located on the side of the counterweight 23 closer to the impeller 22, and a third gap 33 is formed between the third support 13 and the rotor structure 20 around the rotor structure 20. In one embodiment of this application, the second gap 32 is formed by the cooperation of the second support 12 and the counterweight 23.

[0036] In one embodiment of this application, the first support 11 is a hollow sleeve fixed to the outlet section of the pump body 10 and is assembled in a detachable manner. The second support 12 and the third support 13 are also assembled in a detachable manner, specifically using screws for assembly.

[0037] A balancing cavity 35 is formed between the first gap 31 and the second gap 32; the second gap 32 connects the inside and outside of the balancing cavity 35 for pressure relief of the balancing cavity 35. The third gap 33 connects the drain end of the impeller 22 and the first gap 31; the third gap 33 is closer to the rotation axis of the rotor structure 20 than the first gap 31.

[0038] The first gap 31 connects the impeller's drain end and the balance chamber 35 through the third gap 33. High-pressure water from the impeller's drain end can enter the balance chamber 35 through the third gap 33 and the first gap 31. Water in the balance chamber 35 can leak through the second gap 32. Based on Figures 1-3As 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 12, the second gap 32 decreases, the leakage of the balance chamber 35 decreases, and the water pressure increases. This increases the pressure of the liquid in the balance chamber 35 acting on the balance body 23 to the left, thereby changing the direction of the force on the rotor structure 20 to the left. At this time, as the direction of the force on 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 12, the second gap 32 increases, the leakage of the balance chamber 35 increases, and the water pressure decreases. This reduces the leftward pressure exerted by the liquid in the balance chamber 35 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 size of the second gap 32 changes accordingly, causing the force on the rotor structure 20 to reverse, thus causing the rotor structure 20 to move in the opposite direction. In this way, the rotor structure 20 can maintain dynamic balance.

[0039] In one embodiment of this application, a secondary balancing body 24 is further provided on the rotor structure 20. The secondary balancing body 24 is located on the side of the second support 12 away from the impeller 22. A fourth gap 34 is formed between the secondary balancing body 24 and the second support 12. A secondary balancing cavity 36 is formed between the secondary balancing body 24 and the second support 12. The second gap 32 connects the balancing cavity 35 and the secondary balancing cavity 36. The fourth gap 34 connects the inside and outside of the secondary balancing cavity 36 and is used for depressurization of the secondary balancing cavity 36.

[0040] Specifically, when the rotor structure 20 moves axially to the right, the secondary balancer 24 on the rotor structure 20 moves away from the second support 12, the fourth gap 34 increases, the leakage of the secondary balancer cavity 34 increases, the pressure decreases, and the force on the secondary balancer 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 secondary balancer 24 on the rotor structure 20 moves closer to the second support 12, the fourth gap 34 decreases, the leakage of the secondary balancer cavity 34 decreases, the pressure increases, and the force on the secondary balancer 24 changes to the right to resist the movement of the rotor structure 20.

[0041] In this embodiment, the third gap 33 connects the drain end of the impeller 22 and the first gap 31; the third gap 33 is closer to the rotation axis of the rotor structure 20 than the first gap 31.

[0042] It should be understood that in high-pressure operating environments, wear intensifies, and the internal volume of the gap increases. When the first gap 31 increases, the amount of water contained in the first gap 31 increases accordingly, reducing the water renewal efficiency and the efficiency of the water flow in carrying away heat. This causes the temperature of the water in the first gap 31 to rise, and the number and size of bubbles to increase, thus affecting the establishment of pressure in the balance chamber. Consequently, the leftward pressure exerted by the liquid in the balance chamber 35 on the balance body 23 decreases. Ultimately, the rotor structure is pushed to the right by the high-pressure fluid in the pump and is blocked. The balance body 23 directly abuts against the second support 12, the second gap 32 is eliminated, and the balance function is lost. In this embodiment, a third gap 33 is provided before the first gap 31. The high-pressure water from the drain end of the impeller 22 needs to enter the first gap 31 through the third gap 33. The third gap 33 allows the water flow to pass through the first gap 31 more evenly, avoiding the formation of stagnant water due to slow local flow in the first gap 31, which would cause local heat accumulation. This improves the heat dissipation capacity of the water flow in the first gap 31, reduces the generation of bubbles, and increases the reliability of the balance structure. In addition, the third gap 33 is closer to the rotation axis of the rotor structure 20 than the first gap 31, has a smaller radius, and has less impact on the water flow rate during wear.

[0043] In one embodiment of this application, the third support 13 includes a support body 131 and a wear-resistant sleeve 132; the support body 131 is fixedly assembled inside the pump body 10; the wear-resistant sleeve 132 is assembled on the support body 131 through a threaded connector; the third gap 33 is formed by the wear-resistant sleeve 132 and the rotor structure 20.

[0044] In one embodiment of this application, the mating surface on the first support 11 used to form the first gap 31 is a concave-convex surface. Further, a plurality of groove structures 111 are evenly spaced on the mating surface of the first support 11 used to form the first gap 31 to create the concave-convex surface. The concave-convex structure on the mating surface of the first gap 31 can slow down the flow rate of high-pressure water and reduce leakage. When high-pressure water enters the groove structure 111, it diffuses and flows into the groove structure 111. When the high-pressure water flows out of the groove structure 111, it needs to re-contract and flow. Therefore, the high-pressure water needs to continuously diffuse and contract when passing through the groove structure 111, thereby slowing down the flow rate of the high-pressure water and reducing leakage.

[0045] In the above embodiments of this application, the descriptions of each embodiment have different focuses. For parts not described in detail in a certain embodiment, please refer to the relevant descriptions of other embodiments.

[0046] Furthermore, the terms "first" and "second" are used for descriptive purposes only and should not be construed as indicating or implying relative importance or implicitly specifying the number of indicated technical features. Thus, a feature defined as "first" or "second" may explicitly or implicitly include at least one of that feature. In the description of this application, "a plurality of" means at least two, such as two, three, etc., unless otherwise explicitly specified. It should be noted that the terminology used herein is for the purpose of describing particular embodiments only and is not intended to limit the exemplary embodiments according to this application. As used herein, unless the context clearly indicates otherwise, the singular form is also intended to include the plural form. Furthermore, it should be understood that when the terms "comprising" and / or "including" are used in this specification, they indicate the presence of features, steps, operations, devices, components, and / or combinations thereof.

[0047] The specific embodiments described herein are merely illustrative examples of the technical solutions of this application. Those skilled in the art to which this application pertains may make various modifications or additions to the described specific embodiments or use similar methods to replace them, but without departing from the scope defined by the claims of this application.

Claims

1. A drum self-balancing pump characterized by, The drum self-balancing pump includes: The pump body has an inlet section, a middle section, and an outlet section; The rotor structure includes a pump shaft and an impeller; the pump shaft passes through the internal space of the pump body, and the impeller is arranged on the pump shaft; The pump body is provided with annular first, second, and third supports on the water outlet section; the rotor structure is provided with a balancing body; The first support covers the periphery of the balance body, and a first gap is formed between the first support and the balance body around the rotor structure in a circumferential direction; The second support is located on the side of the balance body away from the impeller, and a second gap is formed between the second support and the rotor structure around the circumference of the rotor structure; The third support is located on the side of the balance body closer to the impeller, and a third gap is formed between the third support and the rotor structure around the circumference of the rotor structure. A balancing cavity is formed between the first gap and the second gap; the second gap connects the inside and outside of the balancing cavity to facilitate pressure relief of the balancing cavity; The third gap connects the drain end of the impeller and the first gap; the third gap is closer to the rotation axis of the rotor structure than the first gap.

2. The drum self-balancing pump of claim 1, wherein, The third support includes a support body and a wear-resistant sleeve; the support body is fixedly assembled inside the pump body; the wear-resistant sleeve is assembled on the support body through a threaded connector; the third gap is formed by the fit between the wear-resistant sleeve and the rotor structure.

3. The drum-type self-balancing pump according to claim 1, characterized in that, The rotor structure is also provided with a secondary balancing body, which is located on the side of the second support away from the impeller; a fourth gap is formed between the secondary balancing body and the second support. A secondary balancing cavity is formed between the secondary balancing body and the second support; the second gap connects the balancing cavity and the secondary balancing cavity; the fourth gap connects the inside and outside of the secondary balancing cavity and is used for depressurization of the secondary balancing cavity.

4. The drum self-balancing pump of claim 1, wherein, The second gap is formed by the cooperation of the second support and the balance body.

5. The drum self-balancing pump of claim 1, wherein, The mating surface on the first support used to form the first gap is a concave-convex surface.

6. The drum self-balancing pump of claim 5, wherein, The first support has a plurality of groove structures evenly spaced on the mating surface used to form the first gap, so as to form a concave-convex surface.

7. The drum self-balancing pump of claim 1, wherein, The first support is a hollow sleeve fixed to the water outlet section of the pump body and is assembled in a detachable manner.

8. The drum self-balancing pump of claim 1, wherein, Both the second support and the third support are assembled in a detachable manner.

9. The drum self-balancing pump of claim 1, wherein, The rotor structure is equipped with multi-stage impellers.

10. The drum self-balancing pump of claim 1, wherein, The impeller is specifically configured as a centrifugal pump impeller or a mixed-flow pump impeller.

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