A split single-stage double-suction centrifugal pump

Abstract

This invention relates to a split-case single-stage double-suction centrifugal pump, belonging to the field of mechanical engineering pump technology. The invention includes a pump body assembly, a pump rotor assembly, and a bearing housing assembly. The pump body assembly consists of a horizontally split lower pump body and an upper pump cover connected to form a volute-shaped flow channel. The pump rotor assembly is located within the inner cavity of the pump body assembly and includes a pump shaft, a symmetrical double-suction impeller fixedly mounted in the middle of the pump shaft, and sealing bushings and water-retaining sleeves fitted onto the pump shaft and located on both sides of the impeller. The bearing housing assembly includes a drive-side bearing housing assembly and a non-drive-side bearing housing assembly connected to both sides of the pump body assembly. Both the drive-side and non-drive-side bearing housing assemblies include a bearing housing connected to the pump body assembly, a rolling bearing installed in the bearing housing and fitted onto the end of the pump shaft, and a bearing cap connected to the end of the bearing housing. This invention achieves reliable bearing grease sealing and convenient maintenance, while ensuring the stability of the double-suction pump operation.

Description

Technical Field

[0001] This utility model belongs to the field of mechanical engineering pump technology, specifically relating to a split-case single-stage double-suction centrifugal pump. Background Technology

[0002] Existing split-case, single-stage, and double-suction centrifugal pumps generally use grease lubrication for their bearing housings, and employ packing or simple groove seals at the gap between the bearing cap and the pump shaft to prevent grease leakage. This structure requires disassembly of the pump body and bearing components during equipment maintenance, a cumbersome process. Furthermore, reassembly is prone to compromised sealing performance due to improper installation of sealing elements, potentially leading to water or impurities entering the bearing cavity and shortening bearing life. Therefore, it is necessary to provide a double-suction pump structure that offers more reliable sealing and easier maintenance. Utility Model Content

[0003] This invention addresses the aforementioned problems and overcomes the shortcomings of existing technologies by providing a split-case single-stage double-suction centrifugal pump. This invention achieves reliable bearing grease sealing and convenient maintenance, while ensuring the stability of the double-suction pump operation.

[0004] To achieve the above objectives, the present invention adopts the following technical solution.

[0005] This utility model provides a split-case single-stage double-suction centrifugal pump, including a pump body component, a pump rotor component, and a bearing body component. The pump body component is characterized by a volute-shaped flow channel formed by a horizontally split lower pump body and an upper pump cover. The pump rotor component is disposed within the inner cavity of the pump body component. The pump rotor component includes a pump shaft, a symmetrical double-suction impeller fixedly installed in the middle of the pump shaft, and sealing bushings and water-blocking sleeves sleeved on the pump shaft and located on both sides of the impeller. The two ends of the pump shaft respectively penetrate the two side walls of the pump body component. The bearing body component includes a drive-side bearing body component and a non-drive-side bearing body component respectively connected to both sides of the pump body component. Both the drive-side and non-drive-side bearing body components include a bearing housing connected to the pump body component, a rolling bearing installed in the bearing housing and sleeved at the end of the pump shaft, and a bearing cap connected to the end of the bearing housing. A first oil separator and a second oil separator are respectively provided at both ends of each rolling bearing along the axial direction of the pump shaft.

[0006] Furthermore, the first oil separator is installed inside the bearing cap, and the second oil separator is installed in the shaft hole at one end of the bearing housing near the pump body component.

[0007] Furthermore, rectangular annular grooves are provided on the inner walls of both the sealing bushing and the water-blocking sleeve, and a first O-ring and a second O-ring are respectively installed in the rectangular annular grooves.

[0008] Furthermore, both ends of the pump shaft are fastened to the inner ring of the rolling bearing by round nuts, and a lock ring is provided at the round nut to prevent loosening.

[0009] Furthermore, a sealing box is provided on the inner wall of the volute-shaped flow channel of the pump body component at the position corresponding to the inlet ring of the impeller, and a sealing ring that mates with the impeller inlet ring is installed in each sealing box.

[0010] Furthermore, a rectangular annular groove is provided on the outer circumference of the sealing box, and a third O-ring is embedded in the rectangular annular groove.

[0011] Furthermore, the sealing body is provided with a cavity for installing an axial seal, and the axial seal is pressed and fixed in the cavity by a sealing cap and fasteners.

[0012] Furthermore, the rolling bearing is grease lubricated.

[0013] Furthermore, both ends of the pump shaft are provided with interfaces for connecting power input devices.

[0014] Furthermore, by adjusting the axial position of the baffle sleeve on the pump shaft, the impeller can be aligned with the center of the flow channel of the pump body component.

[0015] The beneficial effects of this utility model.

[0016] This invention features independently installed, quickly replaceable oil separators at both ends of the bearing, forming an effective double seal. This significantly reduces the risk of grease leakage, and replacement of the seals does not require extensive disassembly. The drive-side and non-drive-side bearing housings are structurally identical, offering excellent interchangeability and reducing spare parts inventory and management costs. A double-suction impeller balances axial force, and both ends of the pump shaft can serve as drive inputs, supporting dual-drive or standby drive configurations, making it particularly suitable for critical operating conditions requiring high reliability. Adjusting the impeller's axial position via the baffle sleeve facilitates easy alignment of the impeller and volute flow channel, helping to maintain efficient pump operation. Attached Figure Description

[0017] To make the technical problems solved, the technical solutions, and the beneficial effects of this utility model clearer, the present utility model will be further described in detail below with reference to the accompanying drawings and specific embodiments. It should be understood that the specific embodiments described herein are merely illustrative of the present utility model and are not intended to limit the present utility model.

[0018] Figure 1 This is a cross-sectional view of the overall structure of this utility model.

[0019] Figure 2This is a schematic diagram of the explosive disassembly of the main components of this utility model.

[0020] The markings in the diagram are as follows: 1 is the lower pump body, 2 is the upper pump cover, 3 is the pump shaft, 4 is the impeller, 5 is the sealing ring, 6 is the sealing gland, 7 is the third O-ring seal, 8 is the sealing gland, 9 is the axial seal, 10 is the sealing bushing, 11 is the water baffle, 12 is the bearing housing, 13 is the rolling bearing, 14 is the bearing gland, 15 is the round nut, 16 is the anti-reverse ring, 17 is the first oil separator, 18 is the second oil separator, 19 is the first O-ring seal, and 20 is the second O-ring seal. Detailed Implementation

[0021] Combined with appendix Figure 1 and attached Figure 2 As shown, this embodiment provides a split-case single-stage double-suction centrifugal pump, the core components of which include a pump body component, a rotor component disposed within the pump body component, and a bearing body component connected to both sides of the pump body.

[0022] The pump body assembly constitutes the static flow section of the pump. It employs a horizontal, split-open design, consisting of a lower pump body 1 and an upper pump cover 2, fastened together by bolts to form a complete volute-shaped pressure chamber. Inside the pump body, corresponding to the inlet positions on both sides of the impeller 4, a sealing gland 6 is installed. Each sealing gland 6 is press-fitted with a sealing ring 5, which forms a small radial gap seal with the sealing ring on the impeller 4 to reduce internal leakage. The seal between the sealing gland 6 and the pump body assembly is achieved through an annular groove machined on its large outer circumference and a third O-ring 7 installed within the groove. Additionally, the sealing gland 6 may optionally have a cavity for installing axial seals 9, such as packing seals or mechanical seals, which are then secured by independent sealing caps 8 and bolts.

[0023] The pump rotor assembly is housed within the inner cavity of the aforementioned pump body assembly. The pump shaft 3 is horizontally arranged, with both ends extending through the side walls of the pump body assembly. The double-suction impeller 4 is fixed to the middle of the pump shaft 3 via a key connection. A sealing sleeve 10 and a water-retaining sleeve 11 are sequentially fitted onto both sides of the impeller 4. A first O-ring seal 19 is installed in the inner groove of the sealing sleeve 10, and a second O-ring seal 20 is installed in the inner groove of the water-retaining sleeve 11. Together, they prevent leakage of the pump medium along the surface of the pump shaft 3 towards the bearing side. The water-retaining sleeve 11 also serves for axial positioning; by adjusting its position on the pump shaft 3 or by selecting shims of different specifications, the axial center position of the impeller 4 in the volute flow channel can be precisely fine-tuned.

[0024] The bearing housing components are symmetrically connected to both sides of the pump body component to support the pump rotor component. The bearing housing components on the driving side and the non-driving side have identical structures. Each bearing housing component mainly consists of a bearing housing 12, a pair of rolling bearings 13 such as angular contact ball bearings or deep groove ball bearings, and a bearing cover 14. The bearing housing 12 is fixed to the end face of the pump body component by bolts. The rolling bearings 13 are installed in pairs inside the bearing housing 12, with their inner rings fitted onto the journal of the pump shaft 3. To prevent grease leakage from the bearing cavity along the pump shaft 3 axially, removable sealing elements are provided on both end faces of the rolling bearings 13. Specifically, a first oil separator 17 is installed on the side near the bearing cover 14, and a second oil separator 18 is installed on the side near the pump body component at the step of the shaft hole of the bearing housing 12 itself. These two oil separators together constitute the axial sealing system for bearing grease lubrication.

[0025] The assembly relationship between the pump rotor assembly and the bearing housing assembly is as follows: The pump shaft 3, which is equipped with the impeller 4, the sealing bushing 10 and the water baffle 11, is inserted into the bearing housing 12, which has the rolling bearing 13 already installed, so that the inner ring of the bearing abuts against the shoulder of the pump shaft 3. Then, round nuts 15 are screwed in from both ends of the pump shaft 3 to axially press the inner ring of the bearing, the sealing bushing 10 and other components. Finally, a retaining ring 16 is inserted on the outside of the round nut 15 to prevent the round nut 15 from loosening during operation.

[0026] Because the pump shaft 3 has a symmetrical structure at both ends, either end can be used as a power input end, which provides users with the flexibility to install the main drive motor, backup drive unit (such as a steam turbine), or monitoring instruments. During maintenance, if only the first oil separator 17 or the second oil separator 18 needs to be replaced or the bearing condition needs to be checked, the operation can be carried out by simply removing the bearing cover 14, without having to open the pump body split surface or disassemble the entire rotor, which greatly simplifies the daily maintenance process.

[0027] It is understood that the above specific description of this utility model is only used to illustrate this utility model and is not limited to the technical solutions described in the embodiments of this utility model. Those skilled in the art should understand that modifications or equivalent substitutions can still be made to this utility model to achieve the same technical effect; as long as the use needs are met, they are all within the protection scope of this utility model.

Claims

1. A split-case single-stage double-suction centrifugal pump, comprising a pump body assembly, a pump rotor assembly, and a bearing housing assembly, characterized in that, The pump body component consists of a horizontally split lower pump body (1) and an upper pump cover (2) connected to form a volute-shaped flow channel. The pump rotor component is located in the inner cavity of the pump body component. The pump rotor component includes a pump shaft (3), a symmetrical double-suction impeller (4) fixedly installed in the middle of the pump shaft (3), and sealing bushings (10) and baffles (11) sleeved on the pump shaft (3) and located on both sides of the impeller (4). The two ends of the pump shaft (3) respectively penetrate the two side walls of the pump body component. The bearing body component includes components respectively connected to the pump body. The drive-side bearing housing and the non-drive-side bearing housing on both sides of the component include a bearing housing (12) connected to the pump body component, a rolling bearing (13) installed in the bearing housing (12) and sleeved on the end of the pump shaft (3), and a bearing cap (14) connected to the end of the bearing housing (12). A first oil separator (17) and a second oil separator (18) are respectively provided at both ends of each rolling bearing (13) along the axial direction of the pump shaft (3).

2. The split-case single-stage double-suction centrifugal pump according to claim 1, characterized in that, The first oil separator (17) is installed on the inner side of the bearing cover (14), and the second oil separator (18) is installed on the shaft hole of the bearing housing (12) near the pump body component.

3. A split-case single-stage double-suction centrifugal pump according to claim 1, characterized in that, The inner walls of the sealing bushing (10) and the water-blocking sleeve (11) are provided with rectangular annular grooves, and the first O-ring seal (19) and the second O-ring seal (20) are respectively installed in the rectangular annular grooves.

4. A split-case single-stage double-suction centrifugal pump according to claim 1, characterized in that, The two ends of the pump shaft (3) are fastened to the inner ring of the rolling bearing (13) by round nuts (15), and a lock ring (16) is provided at the round nut (15) to prevent loosening.

5. A split-case single-stage double-suction centrifugal pump according to claim 1, characterized in that, A sealing box (6) is provided on the inner wall of the volute-shaped flow channel of the pump body component at the position corresponding to the inlet ring of the impeller (4), and a sealing port ring (5) that cooperates with the inlet ring of the impeller (4) is installed in each sealing box (6).

6. A split-case single-stage double-suction centrifugal pump according to claim 5, characterized in that, The outer circumference of the sealing box (6) is provided with a rectangular annular groove, and a third O-ring (7) is embedded in the rectangular annular groove.

7. A split-case single-stage double-suction centrifugal pump according to claim 5, characterized in that, The sealing box (6) is provided with a cavity for installing an axial seal (9), and the axial seal (9) is pressed and fixed in the cavity by a sealing cap (8) and fasteners.

8. A split-case single-stage double-suction centrifugal pump according to claim 1, characterized in that, The rolling bearing (13) is grease lubricated.

9. A split-case single-stage double-suction centrifugal pump according to claim 1, characterized in that, Both ends of the pump shaft (3) are provided with interfaces for connecting power input devices.

10. A split-case single-stage double-suction centrifugal pump according to claim 1, characterized in that, By adjusting the axial position of the baffle sleeve (11) on the pump shaft (3), the impeller (4) can be aligned with the center of the flow channel of the pump body component.

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