Compact drum self-balancing pump

Abstract

The utility model provides a kind of compact drum type self-balancing pump, it is related to pump technical field, including pump body, rotor structure, pump shaft is arranged in the internal space of pump body, impeller is arranged on pump shaft;The inside of the water outlet section of pump body is provided with annular first inner support, second inner support;Rotor structure is provided with balance body;First inner support is covered in the outer periphery of balance body, and, around the rotor structure circumferential circle between first inner support and balance body form first gap;Second inner support is located in the side of balance body away from impeller, and around the rotor structure circumferential circle between second inner support and rotor structure form second gap;The water outlet section of pump body includes the shell body of multiple segments distributed along the axis, and the shell body of multiple segments is fixed together axially to form the external structure of pump body;Second inner support is assembled between two shell bodies, and is tightly fixed by two shell bodies. The structure of the application is more compact, suitable for compact drum type self-balancing pump.

Description

Technical Field

[0001] This application relates to the field of pump technology, and in particular to a compact drum 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, the 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 prone to damage. It can also cause premature aging of the motor coil insulation. This phenomenon becomes more pronounced at higher pump operating pressures. Therefore, pumps often incorporate self-balancing mechanisms to balance the axial force on the rotor structure. For example, Chinese patent CN202510527174.1 discloses a repairable self-balancing multistage pump, which uses a self-balancing structure to balance the axial force on the rotor structure.

[0003] However, in some compact pumps, the internal space is too small to accommodate a self-balancing structure. Utility Model Content

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

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

[0006] The pump body includes the inlet section, the middle section, and the outlet section;

[0007] A 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 outlet section of the pump body is provided with annular first inner support and second inner support; a balancing body is provided on the rotor structure; the first inner support covers the periphery of the balancing body, and a first gap is formed between the first inner support and the balancing body around the circumference of the rotor structure; the second inner support is located on the side of the balancing body away from the impeller, and a second gap is formed between the second inner 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 for pressure relief of the balancing cavity; the first gap connects the drain end of the impeller and the balancing cavity;

[0008] The water outlet section of the pump body includes multiple outer shell sections distributed along the axial direction. The multiple outer shell sections are axially fixed together to form the external structure of the pump body. The second inner support is assembled between the two outer shell sections and is pressed and fixed by the two outer shell sections.

[0009] Optionally, the outlet section of the pump body includes a first outer shell and a second outer shell; the first outer shell is fixedly connected to the middle section and forms a drain outlet; the second outer shell is connected to the side of the first outer shell away from the middle section;

[0010] The first inner support is sleeved and fixed in the inner ring of the first outer shell; the second inner support is assembled between the first outer shell and the second outer shell, and is pressed and fixed by the first outer shell and the second outer shell.

[0011] Optionally, the exteriors of the first and second housing segments are connected by screws or bolts.

[0012] Optionally, inside the pump body, the first outer shell section is provided with a first mounting groove on the side near the second outer shell section, and the second outer shell section is provided with a second mounting groove on the side near the first outer shell section.

[0013] The second inner support is assembled in the first mounting groove and the second mounting groove. When the first outer shell and the second outer shell are fixed together, the second inner support is tightly combined with the first mounting groove and the second mounting groove respectively.

[0014] Optionally, the second inner support is sealed to the first mounting groove by a first sealing ring; the second inner support is sealed to the second mounting groove by a second sealing ring.

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

[0016] A secondary balancing cavity is formed between the secondary balancing body and the second inner support; the second gap connects the balancing cavity and the secondary balancing cavity; the third 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 inner support and the balance body.

[0018] Optionally, the impeller is specifically configured as a centrifugal pump impeller or a mixed-flow pump impeller.

[0019] In this application, the pump body's outlet section is internally provided with annular first and second inner supports; the outlet section of the pump body includes multiple axially distributed outer shell sections, which are axially fixed together to form the external structure of the pump body; the second inner support is assembled between the two outer shell sections and is pressed and fixed by the two outer shell sections. The drum self-balancing pump provided in this application eliminates the bolts or screws and other fasteners of the self-balancing structure, and is directly pressed and fixed by the two outer shell sections, reducing the internal space required for the self-balancing structure of the pump body, making the structure more compact, and suitable for compact drum self-balancing pumps. Attached Figure Description

[0020] Figure 1 This is a schematic diagram of the structure of the compact drum self-balancing pump in the embodiments of this application.

[0021] Figure 2 yes Figure 1 A magnified view of a portion of the image.

[0022] Reference numerals: Pump body 10, first outer casing 11, first mounting groove 111, second outer casing 12, second mounting groove 121, first inner support 13, second inner support 14, rotor structure 20, pump shaft 21, impeller 22, balance body 23, secondary balance body 24, first gap 31, second gap 32, third gap 33, balance chamber 34, secondary balance chamber 35. Detailed Implementation

[0023] 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.

[0024] It should be noted that, unless otherwise specified, the embodiments and features described in this application can be combined with each other.

[0025] In this application, the drum-type self-balancing pump relies on leakage at the outlet end to generate a changing balancing force to dynamically balance the axial force of the rotor. Therefore, the process of using a balancing structure to balance the axial force is a dynamic process that can change with the axial force. The rotor structure generally moves back and forth during operation. However, in some compact pumps, the internal space is too small to accommodate a self-balancing structure.

[0026] refer to Figure 1 and Figure 2The compact drum self-balancing pump includes a pump body 10 and a rotor structure 20. The pump body 10 includes an inlet section A, a middle section B, and an outlet section C. 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. The water outlet section of the pump body 10 is provided with an annular first inner support 13 and a second inner support 14. A balance body 23 is provided on the rotor structure 20. The first inner support 13 covers the outer periphery of the balance body 23, and a first gap 31 is formed between the first inner support 13 and the balance body 23 around the rotor structure 20. The second inner support 14 is located on the side of the balance body 23 away from the impeller 22, and a second gap 32 is formed between the second inner support 14 and the rotor structure 20 around the rotor structure 20. A balance cavity 34 is formed between the first gap 31 and the second gap 32. The second gap 32 connects the inside and outside of the balance cavity 34 for pressure relief of the balance cavity 34. The first gap 31 connects the drain end of the impeller 22 and the balance cavity 34. In one embodiment of this application, the second gap 32 is formed by the cooperation of the second inner support and the balance body 23.

[0027] The water outlet section of the pump body 10 includes multiple outer shell sections distributed along the axial direction. The multiple outer shell sections are axially fixed together to form the external structure of the pump body 10. The second inner support 14 is assembled between the two outer shell sections and is pressed and fixed by the two outer shell sections.

[0028] In an exemplary pump body structure, reference Figure 1 The pump body consists of an inlet section, an intermediate section, and an outlet section. The inlet section is the front end of the pump, its main function being to introduce the liquid to be pumped from the outside. It is usually connected to the pump's inlet pipe, allowing the liquid to flow smoothly into the pump body. The inlet section is designed with an inlet and a guide structure to smoothly introduce the liquid and guide it towards the impeller. The outlet section is located at the end of the pump, its main function being to guide the liquid flowing from the impeller to the outside. It is usually connected to the pump's outlet pipe, ensuring smooth liquid output. The outlet section is also designed with a guide and an outlet to smoothly guide the liquid out and reduce pressure loss at the outlet. The intermediate section is located between the inlet and outlet sections, housing the impeller and acting as a channel for liquid flow within the pump. In some pump designs, the outlet section of the pump body has a self-balancing structure to balance the axial unbalanced forces of the rotor structure.

[0029] The pump body 10 has annular first inner support 13 and second inner support 14 inside the outlet section. The outlet section of the pump body includes multiple outer shell sections distributed axially, which are axially fixed together to form the external structure of the pump body. The second inner support 14 is assembled between the two outer shell sections and is pressed and fixed by the two outer shell sections. The drum self-balancing pump provided in this application eliminates the bolts or screws and other fasteners of the self-balancing structure, and is directly pressed and fixed by the two outer shell sections, reducing the internal space of the pump body required for the self-balancing structure, making the structure more compact and suitable for compact drum self-balancing pumps.

[0030] In one embodiment of this application, the outlet section of the pump body 10 includes a first outer shell 11 and a second outer shell 12; the first outer shell 11 is fixedly connected to the middle section and forms a drain outlet; the second outer shell 12 is connected to the side of the first outer shell 11 away from the middle section. A first inner support 13 is sleeved and fixed in the inner ring of the first outer shell 11; a second inner support 14 is assembled between the first outer shell 11 and the second outer shell 12 and is pressed and fixed by the first outer shell 11 and the second outer shell 12. This eliminates the need for bolts or screws and other fasteners, reducing the internal space required for the self-balancing structure, resulting in a more compact structure suitable for compact drum-type self-balancing pumps.

[0031] In one embodiment of this application, reference is made to Figure 2 The first outer casing 11 and the second outer casing 12 are externally connected by screws or bolts. This allows engineers to assemble and disassemble the first outer casing 11 and the second outer casing 12 from the outside of the pump body. Inside the pump body 10, the first outer casing 11 has a first mounting groove 111 on the side near the second outer casing 12, and the second outer casing 12 has a second mounting groove 121 on the side near the first outer casing 11. The second inner support 14 is assembled in the first mounting groove 111 and the second mounting groove 121. When the first outer casing 11 and the second outer casing 12 are fixed together, the second inner support 14 is tightly joined with the first mounting groove 111 and the second mounting groove 121, respectively. Furthermore, the second inner support 14 is sealed to the first mounting groove 111 by a first sealing ring; the second inner support 14 is sealed to the second mounting groove 121 by a second sealing ring.

[0032] 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.

[0033] 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.

[0034] The first gap 31 connects the drain outlet of the multi-stage impeller and the balance chamber 34. High-pressure water from the drain outlet can enter the balance chamber 34 through the first gap 31, and water in the balance chamber 34 can leak through the second gap 32. Based on Figure 1 and Figure 2As 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 inner support 14, the second gap 32 decreases, the leakage of the balance chamber 34 decreases, and the water pressure increases. This increases the pressure of the liquid in the balance chamber 34 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 inner support 14, the second gap 32 increases, the leakage of the balance chamber 34 increases, and the water pressure decreases. This reduces the pressure exerted by the liquid in the balance chamber 34 on the balance body 23 to the left, thus 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 32 changes, causing the rotor structure 20 to move in the opposite direction. In this way, the rotor structure 20 can maintain dynamic balance.

[0035] In one embodiment of this application, the rotor structure 20 is further provided with a secondary balancing body 24, which is located on the side of the second inner support away from the impeller 22; a third gap 33 is formed between the secondary balancing body 24 and the second inner support. A secondary balancing cavity 35 is formed between the secondary balancing body 24 and the second inner support; the second gap 32 connects the balancing cavity 34 and the secondary balancing cavity 35; the third gap 33 connects the inside and outside of the secondary balancing cavity 35 and is used for depressurization of the secondary balancing cavity 35.

[0036] When the rotor structure 20 moves axially to the right, the secondary balance body 24 on the rotor structure 20 moves away from the second inner support 14, the third gap 33 increases, the leakage of the secondary balance cavity 35 increases, the pressure decreases, and the pressure exerted by the liquid in the secondary balance cavity 35 on the secondary balance body 24 to the right decreases. When the rotor structure 20 moves axially to the left, the secondary balance body 24 on the rotor structure 20 moves closer to the second inner support 14, the third gap 33 decreases, the leakage of the secondary balance cavity 35 decreases, the pressure increases, and the pressure exerted by the liquid in the secondary balance cavity 35 on the secondary balance body 24 to the right increases. Therefore, when the rotor structure 20 is subjected to force and moves axially, the force on the rotor structure 20 will reverse as the size of the third 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.

[0037] Therefore, this application provides a compact drum-type self-balancing pump. The pump body's outlet section has annular first and second inner supports. The outlet section includes multiple axially distributed outer shell sections, which are axially fixed together to form the pump body's external structure. The second inner support is assembled between the two outer shell sections and is pressed and fixed by them. The drum-type self-balancing pump provided by this application eliminates the need for bolts or screws in the self-balancing structure, directly using the two outer shell sections for pressing and fixing. This reduces the internal space required for the self-balancing structure, resulting in a more compact structure suitable for compact drum-type self-balancing pumps.

[0038] 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.

[0039] 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.

[0040] 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 compact drum-type self-balancing pump, characterized in that, The compact drum self-balancing pump includes: The pump body includes the inlet section, the middle section, and the outlet section; A 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 outlet section of the pump body is provided with annular first inner support and second inner support; a balancing body is provided on the rotor structure; the first inner support covers the periphery of the balancing body, and a first gap is formed between the first inner support and the balancing body around the circumference of the rotor structure; the second inner support is located on the side of the balancing body away from the impeller, and a second gap is formed between the second inner 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 for pressure relief of the balancing cavity; the first gap connects the drain end of the impeller and the balancing cavity; The water outlet section of the pump body includes multiple outer shell sections distributed along the axial direction. The multiple outer shell sections are axially fixed together to form the external structure of the pump body. The second inner support is assembled between the two outer shell sections and is pressed and fixed by the two outer shell sections.

2. The compact drum self-balancing pump according to claim 1, characterized in that, The water outlet section of the pump body includes a first outer shell and a second outer shell; the first outer shell is fixedly connected to the middle section and forms a drain outlet; the second outer shell is connected to the side of the first outer shell away from the middle section; The first inner support is sleeved and fixed in the inner ring of the first outer shell; the second inner support is assembled between the first outer shell and the second outer shell, and is pressed and fixed by the first outer shell and the second outer shell.

3. The compact drum-type self-balancing pump according to claim 2, characterized in that, The exterior of the first and second outer shell sections are connected by screws or bolts.

4. The compact drum self-balancing pump according to claim 2, characterized in that, Inside the pump body, the first outer shell section has a first mounting groove on the side near the second outer shell section, and the second outer shell section has a second mounting groove on the side near the first outer shell section. The second inner support is assembled in the first mounting groove and the second mounting groove. When the first outer shell and the second outer shell are fixed together, the second inner support is tightly combined with the first mounting groove and the second mounting groove respectively.

5. The compact drum self-balancing pump according to claim 4, characterized in that, The second inner support is sealed to the first mounting groove by a first sealing ring; the second inner support is sealed to the second mounting groove by a second sealing ring.

6. The compact drum 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 inner support away from the impeller; a third gap is formed between the secondary balancing body and the second inner support; A secondary balancing cavity is formed between the secondary balancing body and the second inner support; the second gap connects the balancing cavity and the secondary balancing cavity; the third gap connects the inside and outside of the secondary balancing cavity and is used for depressurization of the secondary balancing cavity.

7. The compact drum self-balancing pump according to claim 1, characterized in that, The second gap is formed by the cooperation of the second inner support and the balance body.

8. The compact drum self-balancing pump according to claim 1, characterized in that, The impeller is specifically configured as a centrifugal pump impeller or a mixed-flow pump impeller.

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