New type of pipeline centrifugal pump

Abstract

This utility model relates to a novel pipeline centrifugal pump, comprising a drive source, an intermediate bearing, a pump body, an adjustable positioning ring, and an impeller. The drive source has an output shaft, the extended portion of which is a shaft extension. The intermediate bearing is connected to the shaft extension. The pump body is sealed to the intermediate bearing and has a flow channel cavity. The adjustable positioning ring is disposed in the flow channel cavity of the pump body. The impeller is disposed at the end of the shaft extension and located within the flow channel cavity of the pump body. The adjustable positioning ring includes an annular body and bolt groups. Multiple bolt groups are evenly distributed along the circumference of the annular body. The outer diameter of the annular body is adapted to the inner wall of the pump body, and the inner diameter of the annular body is adapted to the outer diameter of the impeller. The edge of the impeller contacts the bolt groups on the annular body. This utility model uses multiple bolt groups distributed along the circumference of the annular body of the adjustable positioning ring. By directly pushing the edge of the impeller with the bolt groups, precise fine-tuning of coaxiality is achieved, effectively offsetting deviations caused by installation errors, cumulative machining errors, and operational deformation.

Description

Technical Field

[0001] This utility model relates to the field of horizontal centrifugal pump technology, and in particular to a novel pipeline centrifugal pump. Background Technology

[0002] As an important fluid transport device, the pipeline centrifugal pump has been widely used in many fields such as industrial circulating water systems, municipal water supply and drainage, HVAC, and agricultural irrigation due to its advantages of compact structure, convenient installation, and small footprint. Its core working principle is to drive the impeller to rotate at high speed by a motor, and use the centrifugal force generated by the impeller rotation to transport the fluid from the suction end to the discharge end, thereby achieving fluid pressurization and transport.

[0003] In the structural design of traditional pipeline centrifugal pumps, the coaxiality of the impeller and the pump body is a key factor affecting the pump's performance. During assembly, traditional pipeline centrifugal pumps primarily rely on machining precision and assembly experience to ensure the coaxiality of the impeller and pump body, lacking effective adjustment methods. Due to manufacturing errors, accumulated assembly errors, and factors such as temperature deformation and vibration deformation during operation, coaxiality deviations between the impeller and pump body are easily generated. When the coaxiality deviation is large, the impeller will experience localized friction and collision with the inner wall of the pump body during high-speed rotation. This will, on the one hand, accelerate wear on both the impeller and pump body, increasing maintenance costs and downtime; on the other hand, it will disrupt the stable flow state of the fluid within the pump body, leading to turbulent flow, increased hydraulic losses, and a significant decrease in pump head and efficiency. Simultaneously, it will generate strong vibrations and noise, affecting the operational reliability of the equipment and the surrounding environment.

[0004] In summary, traditional pipeline centrifugal pumps have significant shortcomings in terms of impeller-pump shaft connection reliability and impeller-pump body coaxiality control, making it difficult to meet the demands of modern industrial production for efficient, stable, and long-life operation. Therefore, improving the impeller and pump body assembly structure of pipeline centrifugal pumps to solve these technical problems has become an important issue that urgently needs to be addressed by those skilled in the art. Utility Model Content

[0005] Therefore, the technical problem to be solved by this utility model is to overcome the technical problems existing in the prior art and propose a new type of pipeline centrifugal pump, which has multiple bolt groups evenly distributed in the circumferential direction of the annular body of the adjustable positioning ring. The impeller edge is directly pushed by the bolt groups to achieve precise micro-adjustment of coaxiality.

[0006] To solve the above-mentioned technical problems, this utility model provides a novel pipeline centrifugal pump, comprising:

[0007] A drive source having an output shaft, the extended portion of which is a shaft extension;

[0008] A central bearing, which supports the shaft extension, is connected to the shaft extension;

[0009] The pump body is sealed to the intermediate bearing, and the pump body has a flow channel cavity;

[0010] An adjustable positioning ring is disposed in the flow channel cavity of the pump body;

[0011] The impeller is located at the end of the shaft extension and within the flow channel cavity of the pump body;

[0012] The adjustable positioning ring includes an annular body and bolt groups. The annular body has an outer diameter and an inner diameter. Multiple bolt groups are evenly distributed in the circumferential direction of the annular body. The outer diameter of the annular body is adapted to the inner wall of the pump body, and the inner diameter of the annular body is adapted to the outer diameter of the impeller. When the annular body is placed between the pump body and the impeller, the edge of the impeller contacts the bolt groups on the annular body.

[0013] In one embodiment of the present invention, the bolt assembly includes bolts, the annular body has a first surface and a second surface disposed opposite to each other along the thickness direction, and through holes are uniformly formed along the circumferential direction of the annular body, penetrating the first surface and the second surface, and the bolts penetrate the through holes.

[0014] In one embodiment of this utility model, the through hole is a threaded hole.

[0015] In one embodiment of the present invention, the bolt has an end for pushing the impeller, and the end is a spherical end.

[0016] In one embodiment of the present invention, the bolt assembly includes a nut, and after the bolt is screwed into the through hole from the first surface of the annular body until the spherical end of the bolt extends out of the second surface, the nut is screwed into the bolt.

[0017] In one embodiment of this utility model, the impeller edge is provided with an annular positioning boss as a reference for bolt pushing.

[0018] In one embodiment of the present invention, a mechanical seal is further included. The mechanical seal is disposed in a sealing cavity between the shaft extension and the pump body. The stationary ring of the mechanical seal is fixed to the end face of the sealing cavity of the pump body, and the rotating ring rotates with the shaft extension. The mating surfaces of the rotating ring and the stationary ring form an axial seal.

[0019] In one embodiment of the present invention, a sealing ring is further included, which is disposed in the groove of the mating surface between the pump body and the intermediate bearing.

[0020] The above-mentioned technical solution of this utility model has the following advantages compared with the prior art:

[0021] This invention features multiple bolt groups evenly distributed along the circumference of the annular body of the adjustable positioning ring. By directly pushing the impeller edge with these bolt groups, precise micro-adjustment of coaxiality is achieved, effectively offsetting deviations caused by installation errors, cumulative machining errors, and operational deformation. This ensures that the coaxiality of the impeller and pump body is strictly controlled within a high-precision range of 0.05-0.1mm, solving the problem of excessive deviations that often occur when relying on assembly experience in traditional methods.

[0022] This invention reduces friction and collision between the impeller and pump body caused by insufficient coaxiality, lowers the wear rate of components, and extends the service life of core components. Furthermore, adjustments can be made without disassembling the pump body, making operation convenient and efficient, significantly reducing maintenance difficulty and costs, and substantially improving the stability and applicability of the equipment. Attached Figure Description

[0023] To make the content of this utility model easier to understand, the present utility model will be further described in detail below with reference to specific embodiments and accompanying drawings.

[0024] Figure 1 This is a schematic diagram of the structure of the novel pipeline centrifugal pump proposed in this embodiment of the utility model.

[0025] Figure 2 yes Figure 1 A magnified view of part A above.

[0026] Figure 3 This is a schematic diagram of the adjustable positioning ring of this utility model.

[0027] The following are the markings on the accompanying drawings: 1. Drive source; 2. Shaft extension; 3. Central bearing; 4. Impeller; 401. Annular positioning boss; 5. Pump body; 6. Adjustable positioning ring; 601. Annular body; 602. Bolt; 603. Nut; 7. Mechanical seal; 8. Sealing ring. Detailed Implementation

[0028] The present invention will be further described below with reference to the accompanying drawings and specific embodiments, so that those skilled in the art can better understand and implement the present invention. However, the embodiments are not intended to limit the present invention.

[0029] Reference Figures 1 to 3As shown, this utility model embodiment provides a novel pipeline centrifugal pump, including a drive source 1 (preferably a motor), a bearing 3, a pump body 5, an adjustable positioning ring 6, and an impeller 4. The drive source 1 has an output shaft, the extended portion of which is a shaft extension 2. The bearing 3 supports the shaft extension 2 and is connected to the shaft extension 2. The pump body 5 is sealed to the bearing 3 and has a flow channel cavity. The adjustable positioning ring 6 is disposed in the flow channel cavity of the pump body 5. The impeller 4 is disposed at the end of the shaft extension 2 and located in the pump body 5. The adjustable positioning ring 6 includes an annular body 601 and a set of bolts 602. The annular body 601 has an outer diameter and an inner diameter. Multiple sets of bolts 602 are evenly distributed in the circumferential direction of the annular body 601. The outer diameter of the annular body 601 is adapted to the inner wall of the pump body 5, and the inner diameter of the annular body 601 is adapted to the outer diameter of the impeller 4. When the annular body 601 is set between the pump body 5 and the impeller 4, the edge of the impeller 4 contacts the set of bolts 602 on the annular body 601.

[0030] This invention features multiple sets of bolts 602 evenly distributed along the circumference of the annular body 601 of the adjustable positioning ring 6. These bolt sets directly push against the edge of the impeller 4, achieving precise micro-adjustment of coaxiality. This effectively offsets deviations caused by installation errors, cumulative machining errors, and operational deformation, strictly controlling the coaxiality of the impeller 4 and the pump body 5 within a high-precision range of 0.05-0.1mm. This solves the problem of excessive deviations that often occur when relying on assembly experience in traditional methods.

[0031] In one embodiment, the aforementioned bolt 602 assembly includes a bolt 602 and a nut 603. The annular body 601 has a first surface and a second surface arranged opposite each other along the thickness direction. Through holes penetrating the first and second surfaces are uniformly formed along the circumference of the annular body 601, and the bolt 602 penetrates the through holes. Preferably, the through holes can be threaded holes. The bolt 602 has an end for pushing the impeller 4, and the end can be a spherical end to avoid sharp ends scratching the edge of the impeller 4, while ensuring uniform force when in contact with the impeller 4. After the bolt 602 is screwed into the through hole from the first surface of the annular body 601 until the spherical end of the bolt 602 protrudes from the second surface, the nut 603 is screwed into the bolt 602. When a coaxiality deviation is detected (which can be measured by tools such as a dial indicator or laser alignment instrument), the force on the edge of the impeller 4 is changed by adjusting the bolt 602 on the annular body 601, pushing the impeller 4 to a slight displacement, ultimately achieving coaxiality correction. Suppose that the measurement reveals that the impeller 4 is offset to the right of the pump body 5 (i.e., the coaxiality deviation direction is to the right), causing the gap between the impeller 4 and the right flow channel of the pump body 5 to decrease and the gap on the left to increase. Then, the bolt 602 on the left side of the annular body 601 is selected and screwed inward (bolt 602 extends) to press against the left edge of the impeller 4, pushing the impeller 4 to move to the right. At the same time, the bolt 602 on the right side of the annular body 601 is screwed outward (bolt 602 shortens) to release the constraint on the right side of the impeller 4. Through repeated measurements and fine-tuning of bolt 602, the impeller 4 is gradually returned to the ideal position of being coaxial with the pump body 5. Finally, the bolt 602 and nut 603 are tightened to lock the position, completing the coaxiality correction.

[0032] Furthermore, the impeller 4 is provided with an annular positioning boss 401 on its edge, which serves as the reference for the bolt 602 to push. The annular positioning boss 401 provides a uniform annular contact surface for the bolt 602, avoiding local deformation caused by the bolt 602 directly pushing the thin-walled area of ​​the impeller 4 body, ensuring that the pushing force is uniformly transmitted along the circumference of the impeller 4, and preventing the impeller 4 from tilting during adjustment.

[0033] In one embodiment, the novel pipeline centrifugal pump also includes a mechanical seal 7, which is disposed in the sealing cavity between the shaft extension 2 and the pump body 5. The stationary ring of the mechanical seal 7 is fixed to the end face of the sealing cavity of the pump body 5, and the rotating ring rotates with the shaft extension 2. The mating surfaces of the rotating ring and the stationary ring form an axial seal. Through the precise fit and structural design of the rotating and stationary rings, an efficient and reliable solution for shaft end sealing is provided.

[0034] In one embodiment, the novel pipeline centrifugal pump further includes a sealing ring 8, which is disposed in a groove on the mating surface of the pump body 5 and the intermediate support 3. The mating surface of the pump body 5 and the intermediate support 3 is designed with a groove matching the size of the sealing ring 8. After the sealing ring 8 is embedded therein, it fits tightly with the components on both sides. Preferably, the cross-sectional shape of the sealing ring 8 is usually O-shaped, which has good elastic deformation capability. During installation, a pre-tightening force is generated by moderate compression to ensure that the sealing ring 8 fills the groove space and there is no gap between it and the contact surface of the pump body 5 and the intermediate support 3. This structural design can effectively avoid sealing failure caused by assembly errors and enhance the sealing performance and reliability of the mating surface.

[0035] This invention reduces friction and collision between the impeller 4 and the pump body 5 caused by insufficient coaxiality, lowers the wear rate of components, and extends the service life of core components. Furthermore, adjustment can be completed without disassembling the pump body 5, making operation convenient and efficient, significantly reducing maintenance difficulty and costs, and substantially improving the stability and applicability of the equipment.

[0036] Obviously, the above embodiments are merely illustrative examples for clear explanation and are not intended to limit the implementation. Those skilled in the art will recognize that other variations or modifications can be made based on the above description. It is neither necessary nor possible to exhaustively list all possible implementations here. However, obvious variations or modifications derived therefrom are still within the protection scope of this invention.

Claims

1. A novel pipeline centrifugal pump, characterized in that, include: A drive source having an output shaft, the extended portion of which is a shaft extension; A central bearing, which supports the shaft extension, is connected to the shaft extension; The pump body is sealed to the intermediate bearing, and the pump body has a flow channel cavity; An adjustable positioning ring is disposed in the flow channel cavity of the pump body; The impeller is located at the end of the shaft extension and within the flow channel cavity of the pump body; The adjustable positioning ring includes an annular body and bolt groups. The annular body has an outer diameter and an inner diameter. Multiple bolt groups are evenly distributed in the circumferential direction of the annular body. The outer diameter of the annular body is adapted to the inner wall of the pump body, and the inner diameter of the annular body is adapted to the outer diameter of the impeller. When the annular body is placed between the pump body and the impeller, the edge of the impeller contacts the bolt groups on the annular body.

2. The novel pipeline centrifugal pump according to claim 1, characterized in that: The bolt assembly includes bolts. The annular body has a first surface and a second surface that are arranged opposite to each other along the thickness direction. Through holes that penetrate the first surface and the second surface are uniformly opened along the circumference of the annular body, and the bolts penetrate the through holes.

3. A novel pipeline centrifugal pump according to claim 2, characterized in that: The through hole is a threaded hole.

4. A novel pipeline centrifugal pump according to claim 2, characterized in that: The bolt has an end for pushing the impeller, and the end is a spherical end.

5. A novel pipeline centrifugal pump according to claim 4, characterized in that: The bolt assembly includes a nut, which is screwed into the bolt after the bolt is screwed into the through hole from the first surface of the annular body until the spherical end of the bolt protrudes from the second surface.

6. A novel pipeline centrifugal pump according to claim 2, characterized in that: The impeller edge is provided with an annular positioning boss as a reference for bolt pushing.

7. A novel pipeline centrifugal pump according to claim 1, characterized in that: It also includes a mechanical seal, which is disposed in the sealing cavity between the shaft extension and the pump body. The stationary ring of the mechanical seal is fixed to the end face of the sealing cavity of the pump body, and the rotating ring rotates with the shaft extension. The mating surfaces of the rotating ring and the stationary ring form an axial seal.

8. A novel pipeline centrifugal pump according to claim 1, characterized in that: It also includes a sealing ring, which is disposed in the groove of the mating surface between the pump body and the intermediate bearing.

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