A vertical shielded pump

Abstract

This application discloses a vertical canned motor pump, belonging to the field of fluid machinery technology. A pump inlet is located at the bottom of the casing, and a pump outlet is located on its side wall. A gland is located at the top of the casing, and an exhaust pipe is provided on the gland. An impeller is located inside the casing and near the pump inlet. A drive unit is located inside the casing. A through shaft passes through the drive unit and drives its rotation. The impeller is fixed to the through shaft, which has an axially extending central hole that communicates with the exhaust pipe. A first bearing assembly and a second bearing assembly are respectively located on opposite axial sides of the drive unit. The first bearing assembly has an exhaust structure. This application reduces the axial dimension and weight of the pump unit by integrating the radial bearing and thrust bearing. Simultaneously, by providing an exhaust structure, the gas accumulated inside the first bearing assembly is discharged in an orderly manner, effectively suppressing vibration and improving acoustic performance.

Description

Technical Field

[0001] This application relates to the field of fluid machinery technology, and in particular to a vertical canned pump. Background Technology

[0002] Canned motor pumps, due to their seal-free and integrated structure, are widely used in fluid transportation in chemical, shipbuilding, and other fields. With increasingly compact equipment installation spaces and rising demands for energy conservation and emission reduction, miniaturization, weight reduction, and noise reduction of pump units have become important development directions.

[0003] Currently, most commercially available canned motor pumps are horizontal in design. However, in specific applications requiring vertical installation, the structural design of vertical canned motor pumps still faces numerous challenges. Specifically, the sliding bearing system of traditional vertical canned motor pumps typically employs a split arrangement, with radial and thrust bearings independently installed at both ends of the shaft. This split structure results in a larger axial dimension and heavier weight for the pump unit. Furthermore, in a vertical configuration, gas tends to accumulate inside the lower sliding bearing (a phenomenon known as "gas accumulation"), disrupting the continuity of the hydrodynamic film in the bearing clearance. This leads to a decrease in the liquid film's load-bearing capacity, resulting in increased equipment vibration and deteriorated acoustic performance, making it difficult to meet the requirements for use in quiet environments. Utility Model Content

[0004] This application provides a vertical shielded pump, which aims to solve the problems mentioned in the background art.

[0005] This application provides a vertical shielded pump, including: The casing has a pump inlet at its bottom and a pump outlet on its side wall; A pressure cap is disposed on the top of the housing, and an exhaust pipe is provided on the pressure cap; The impeller is disposed within the housing and near the pump inlet; The driving component is disposed within the housing; A through shaft passes through the driving member and is driven to rotate therethrough. The impeller is fixed on the through shaft. The through shaft has a central hole that extends axially and is connected to the exhaust pipe. The first bearing assembly and the second bearing assembly are respectively disposed on both sides of the axial direction of the drive member, and are used to support the through shaft; The first bearing assembly is located between the impeller and the drive component. The first bearing assembly and the second bearing assembly include an integrated bearing. The integrated bearing has a T-shaped structure, with its radial portion forming a radial bearing section and its axial end face portion forming a thrust bearing section. The first bearing assembly is provided with an exhaust structure, which is used to guide the gas accumulated inside the first bearing assembly through the air gap of the drive member and the second bearing assembly to the exhaust pipe for discharge.

[0006] In one possible implementation, the first bearing assembly includes: The first bushing is fixedly sleeved on the through shaft; A first bearing bushing is fitted onto the outside of the first bushing and fixed relative to the housing, and there is a first gap between the inner wall of the first bearing bushing and the outer wall of the first bushing. Both the first bushing and the first bearing bushing have a T-shaped structure, and the outer T-shaped surface of the first bushing and the inner T-shaped surface of the first bearing bushing form a radial mating surface and an axial thrust mating surface. The exhaust structure includes at least one connecting hole on the first bushing, a first end face guide groove on the end face of the first bushing, and an inner wall guide groove on the inner wall of the first bearing liner. The connecting hole is connected to the inner wall guide groove and the first end face guide groove, respectively, and is used to guide gas from the gap between the top wall of the first bearing liner and the bottom wall of the T-shaped structure of the first bushing through the first end face guide groove to the air gap of the drive component.

[0007] In one possible implementation, the end face of the first bearing bush is provided with a radial guide groove extending perpendicular to the axial direction, and the radial guide groove is in communication with the pump inlet.

[0008] In one possible implementation, the connecting holes are a plurality of through holes evenly distributed along the circumference of the first bushing, and the through holes are straight holes or spiral holes.

[0009] In one possible implementation, the second bearing assembly includes: The second bushing is fixedly sleeved on the through shaft; The second bearing bush is sleeved on the outside of the second bushing and fixed relative to the housing, and there is a second gap between the inner wall of the second bearing bush and the outer wall of the second bushing; Both the second bushing and the second bearing bushing have a T-shaped structure, and the outer T-shaped surface of the second bushing and the inner T-shaped surface of the second bearing bushing form a radial mating surface and an axial thrust mating surface; The second bushing and the first bushing are arranged in a mirror-symmetric manner on the through shaft; The end face of the second bearing bush facing the drive member is provided with a second guide groove, which is used to guide the gas from the air gap of the drive member to the exhaust pipe.

[0010] In one possible implementation, one end of the central hole is connected to the pump inlet, and the other end is connected to the exhaust pipe, for discharging the gas entering through the pump inlet.

[0011] One or more technical solutions provided in the embodiments of this application have at least the following technical effects: The vertical canned motor pump provided in this application reduces the axial dimension and overall weight of the pump by setting both the first bearing assembly and the second bearing assembly as T-shaped integrated bearings with radial bearing parts and thrust bearing parts, thus achieving miniaturization and weight reduction of the pump unit. At the same time, by setting an exhaust structure in the first bearing assembly, the gas that is easily accumulated inside the first bearing assembly is guided to the exhaust pipe through the air gap of the drive component and the second bearing assembly in sequence, effectively eliminating the problem of liquid film continuity disruption caused by the "gas accumulation" phenomenon, avoiding increased equipment vibration and deterioration of acoustic performance, so that the vertical canned motor pump can meet the requirements of use in confined installation spaces and quiet places. Attached Figure Description

[0012] To more clearly illustrate the technical solutions in the embodiments of this application, the accompanying drawings used in the description of the embodiments of this application will be briefly introduced below. Obviously, the accompanying drawings described below are some embodiments of this application. For those skilled in the art, other drawings can be obtained based on these drawings without creative effort.

[0013] Figure 1 This is a schematic diagram of the structure of the vertical canned pump provided in the embodiments of this application; Figure 2 This is a schematic diagram of the structure of the first bushing provided in an embodiment of this application; Figure 3 A schematic diagram of the structure of the first bearing bush provided in an embodiment of this application; Figure 4 This is a schematic diagram of the structure of the second bearing bush provided in an embodiment of this application.

[0014] Icons: 1-Housing; 11-Pump inlet; 12-Pump outlet; 2-Gland; 3-Impeller; 4-Drive component; 5-Through shaft; 51-Center hole; 6-First bearing assembly; 61-First bushing; 62-First bearing liner; 621-Inner wall guide groove; 622-Radial guide groove; 63-Exhaust structure; 631-Connecting hole; 632-First end face guide groove; 7-Second bearing assembly; 71-Second bushing; 72-Second bearing liner; 721-Second guide groove; 8-Exhaust pipe. Detailed Implementation

[0015] The technical solutions of the embodiments of this application will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some, not all, of the embodiments of this application. Based on the embodiments of this application, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of this application.

[0016] In the description of the embodiments of this application, it should be noted that the terms "center," "upper," "lower," "left," "right," "vertical," "horizontal," "inner," and "outer," etc., indicate the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings. They are used only for the convenience of describing the embodiments of this application and for simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation. Therefore, they should not be construed as limitations on this application. The terms "first," "second," and "third" are used for descriptive purposes only and should not be construed as indicating or implying relative importance. Furthermore, the terms "installed," "connected," and "linked" should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral connection; they can refer to a mechanical connection or an electrical connection; they can refer to a direct connection or an indirect connection through an intermediate medium; they can refer to the internal connection of two components. Those skilled in the art can understand the specific meaning of the above terms in the embodiments of this application according to the specific circumstances.

[0017] This application provides a vertical shielded pump, such as... Figures 1 to 4 As shown, the vertical canned motor pump includes a housing 1, a gland 2, an impeller 3, a drive unit 4, a through shaft 5, a first bearing assembly 6, and a second bearing assembly 7. The bottom of the housing 1 has a pump inlet 11, and the side wall of the housing 1 has a pump outlet 12. The gland 2 is located at the top of the housing 1 and has an exhaust pipe 8. The impeller 3 is located inside the housing 1 and near the pump inlet 11. The drive unit 4 is located inside the housing 1. The through shaft 5 passes through the drive unit 4 and is driven to rotate by it. The impeller 3 is fixed to the through shaft 5. The through shaft 5 has a central hole 51 that extends axially and communicates with the exhaust pipe 8. The first bearing assembly 6 and the second bearing assembly 7 are respectively located on both axial sides of the drive unit 4 to support the through shaft 5. The first bearing assembly 6 is located between the impeller 3 and the drive unit 4. The first bearing assembly 6 and the second bearing assembly 7 include an integrated bearing with a T-shaped structure. The radial portion forms a radial bearing section, and the axial end face portion forms a thrust bearing section. The first bearing assembly 6 is provided with an exhaust structure 63, which is used to guide the gas accumulated inside the first bearing assembly 6 through the air gap of the drive member 4 and the second bearing assembly 7 to the exhaust pipe 8 for discharge.

[0018] The air gap of the drive component 4 in this application refers to the gap between its rotor and stator.

[0019] It should be noted that this application sets the first bearing assembly 6 and the second bearing assembly 7 to include an integrated bearing, and the integrated bearing has a T-shaped structure, with its radial portion forming a radial bearing section and its axial end face portion forming a thrust bearing section. At the same time, the first bearing assembly 6 is provided with an exhaust structure 63, which guides the gas accumulated inside the first bearing assembly 6 through the air gap of the drive component 4 and the second bearing assembly 7 to the exhaust pipe 8 for discharge. This effectively solves the problems of large axial dimension and heavy weight of pump units caused by traditional split bearings, as well as vibration caused by air accumulation in the lower bearing, and realizes the miniaturization, weight reduction and low noise of the pump unit.

[0020] In this embodiment, the first bearing assembly 6 includes a first bushing 61, a first bearing bushing 62, and an exhaust structure 63. The first bushing 61 is fixedly sleeved on the through shaft 5. The first bearing bushing 62 is sleeved on the outside of the first bushing 61 and fixed relative to the housing 1, with a first gap between the inner wall of the first bearing bushing 62 and the outer wall of the first bushing 61. Both the first bushing 61 and the first bearing bushing 62 have a T-shaped structure, and the T-shaped outer surface of the first bushing 61 and the T-shaped inner surface of the first bearing bushing 62 form a radial mating surface and an axial thrust mating surface. The exhaust structure 63 includes at least one connecting hole 631 on the first bushing 61, a first end face guide groove 632 on the end face of the first bushing 61, and an inner wall guide groove 621 on the inner wall of the first bearing bushing 62. The connecting hole 631 is connected to the inner wall guide groove 621 and the first end face guide groove 632 respectively, and is used to guide the gas from the gap between the top wall of the first bearing bushing 62 and the bottom wall of the T-shaped structure of the first bushing 61 to the air gap of the drive member 4 through the first end face guide groove 632, ensuring that the gas in the gas collection part can be discharged in an orderly manner and avoiding the destruction of the continuity of the liquid film by gas accumulation.

[0021] In this embodiment, the end face of the first bearing bush 62 is provided with a radial guide groove 622 extending perpendicular to the axial direction, and the radial guide groove 622 is connected to the pump inlet 11.

[0022] In this embodiment, the connecting hole 631 is a plurality of through holes evenly distributed around the first bushing 61. The through holes are straight holes or spiral holes, which allows gas to be discharged evenly at multiple points around the circumference. At the same time, the spiral hole structure can further guide the gas flow, improving exhaust efficiency and uniformity.

[0023] In this embodiment, the second bearing assembly 7 includes a second bushing 71 and a second bearing bushing 72. The second bushing 71 is fixedly sleeved on the through shaft 5. The second bearing bushing 72 is sleeved on the outside of the second bushing 71 and fixed relative to the housing 1, with a second gap between the inner wall of the second bearing bushing 72 and the outer wall of the second bushing 71. Both the second bushing 71 and the second bearing bushing 72 have a T-shaped structure, and the T-shaped outer surface of the second bushing 71 and the T-shaped inner surface of the second bearing bushing 72 form a radial mating surface and an axial thrust mating surface. The second bushing 71 and the first bushing 61 are arranged in a mirror-symmetrical manner on the through shaft 5. A second guide groove 721 is provided on the end face of the second bearing bushing 72 facing the drive member 4. The second guide groove 721 communicates with the second gap, and gas enters the second gap through the second guide groove 721 and then flows upward through the second gap to the exhaust pipe 8. The top of the second gap communicates with the exhaust pipe 8.

[0024] In this embodiment, one end of the central hole 51 is connected to the pump inlet 11, and the other end is connected to the exhaust pipe 8, which discharges the gas entering the pump inlet 11, forming an independent gas discharge channel for the pump inlet 11. This channel works in conjunction with the bearing gas collection and exhaust channel to ensure that there is no gas accumulation inside the pump unit, thereby further improving the operational stability of the pump unit.

[0025] In this embodiment, the integrated bearing is the first bearing bush 62 and the second bearing bush 72.

[0026] Based on the above structure, the vertical shielded pump provided in this application has the following internal medium (liquid) flow path and gas discharge path during operation: Medium flow path: The medium enters from the pump inlet 11 at the bottom of the casing 1. One path of the medium flows into the first gap via the radial guide groove 622 on the end face of the first bearing bush 62. The first gap is filled with medium and forms a hydrodynamic liquid film during pump operation, providing stable radial and axial support for the through shaft 5. At the same time, the medium flowing in from the radial guide groove 622 is continuously circulated and renewed, which on the one hand can remove the heat generated by friction inside the first bearing assembly 6, thus playing a cooling role. On the other hand, the continuous flow of the medium can flush out and carry away the tiny impurities generated by wear. The other path of the medium enters the impeller 3 area, is pressurized by the impeller 3, and is discharged from the pump outlet 12 on the side wall of the casing 1.

[0027] Gas Discharge Path: This application provides two independent exhaust channels. The first channel is the bearing gas accumulation discharge channel: Gas accumulated in the gap between the top wall of the first bearing bush 62 and the bottom wall of the T-shaped transverse section of the first bushing 61 is guided sequentially through the inner wall guide groove 621 of the first bearing bush 62, the connecting hole 631 on the first bushing 61, and the first end face guide groove 632 on the end face of the first bushing 61, and then enters the air gap of the drive member 4. Subsequently, the gas flows upward along the air gap, through the second guide groove 721 on the side of the second bearing bush 72 facing the drive member 4, the second gap between the inner wall of the second bearing bush 72 and the outer wall of the second bushing 71, and finally reaches the exhaust pipe 8 on the pressure cover 2 and is discharged outside the pump. The second channel is the pump inlet 11 exhaust channel: Gas entering from the pump inlet 11 goes directly upward through the central hole 51 of the through shaft 5, and also flows into the exhaust pipe 8 on the pressure cover 2 before being discharged outside the pump. Through the synergistic effect of the above two exhaust channels, it is ensured that there is no abnormal gas accumulation inside the pump unit.

[0028] The various embodiments in this specification are described in a progressive manner. For the same or similar parts between the various embodiments, please refer to each other. Each embodiment focuses on describing the differences from other embodiments.

[0029] The above embodiments are only used to illustrate the technical solutions of this application, and are not intended to limit this application. Although this application has been described in detail with reference to the foregoing embodiments, those skilled in the art should understand that modifications can still be made to the technical solutions described in the foregoing embodiments, or equivalent substitutions can be made to some or all of the technical features therein. Such modifications or substitutions do not cause the essence of the corresponding technical solutions to deviate from the scope of the technical solutions of this application.

Claims

1. A vertical canned motor pump, characterized in that, include: The housing (1) has a pump inlet (11) at its bottom and a pump outlet (12) on its side wall. A pressure cap (2) is provided on the top of the housing (1), and an exhaust pipe (8) is provided on the pressure cap (2). Impeller (3) is disposed inside the housing (1) and close to the pump inlet (11); A drive unit (4) is disposed within the housing (1); A through shaft (5) passes through the drive member (4) and is driven to rotate by it. The impeller (3) is fixed on the through shaft (5). The through shaft (5) has a central hole (51) that passes through along the axial direction. The central hole (51) is connected to the exhaust pipe (8). The first bearing assembly (6) and the second bearing assembly (7) are respectively disposed on both sides of the drive member (4) to support the through shaft (5). The first bearing assembly (6) is located between the impeller (3) and the drive member (4). The first bearing assembly (6) and the second bearing assembly (7) include an integrated bearing. The integrated bearing has a T-shaped structure, with its radial portion forming a radial bearing section and its axial end face portion forming a thrust bearing section. The first bearing assembly (6) is provided with an exhaust structure (63), which is used to guide the gas accumulated inside the first bearing assembly (6) through the air gap of the drive member (4) and the second bearing assembly (7) to the exhaust pipe (8) for discharge.

2. The vertical canned motor pump according to claim 1, characterized in that, The first bearing assembly (6) includes: The first bushing (61) is fixedly sleeved on the through shaft (5); The first bearing bush (62) is sleeved on the outside of the first bushing (61) and fixed relative to the housing (1). There is a first gap between the inner wall of the first bearing bush (62) and the outer wall of the first bushing (61). The first bushing (61) and the first bearing bushing (62) are both T-shaped structures, and the T-shaped outer surface of the first bushing (61) and the T-shaped inner surface of the first bearing bushing (62) form a radial mating surface and an axial thrust mating surface. The exhaust structure (63) includes at least one connecting hole (631) on the first bushing (61), a first end face guide groove (632) on the end face of the first bushing (61), and an inner wall guide groove (621) on the inner wall of the first bearing bushing (62). The connecting hole (631) is connected to the inner wall guide groove (621) and the first end face guide groove (632) respectively, and is used to guide gas from the gap between the top wall of the first bearing bushing (62) and the bottom wall of the T-shaped structure of the first bushing (61) through the first end face guide groove (632) to the air gap of the drive member (4).

3. The vertical shielded pump according to claim 2, characterized in that, The end face of the first bearing bush (62) is provided with a radial guide groove (622) extending perpendicular to the axial direction, and the radial guide groove (622) is connected to the pump inlet (11).

4. The vertical canned pump according to claim 2, characterized in that, The connecting hole (631) is a plurality of through holes evenly distributed along the circumference of the first bushing (61), and the through holes are straight holes or spiral holes.

5. The vertical shielded pump according to claim 2, characterized in that, The second bearing assembly (7) includes: The second bushing (71) is fixedly sleeved on the through shaft (5); The second bearing bush (72) is sleeved on the outside of the second bushing (71) and fixed relative to the housing (1). There is a second gap between the inner wall of the second bearing bush (72) and the outer wall of the second bushing (71). The second bushing (71) and the second bearing bushing (72) are both T-shaped structures, and the T-shaped outer surface of the second bushing (71) and the T-shaped inner surface of the second bearing bushing (72) form a radial mating surface and an axial thrust mating surface; The second bushing (71) and the first bushing (61) are arranged in a mirror symmetrical manner on the through shaft (5); The second bearing bush (72) has a second guide groove (721) on the end face facing the drive member (4) to guide the gas from the air gap of the drive member (4) to the exhaust pipe (8).

6. The vertical canned motor pump according to claim 1, characterized in that, One end of the central hole (51) is connected to the pump inlet (11), and the other end is connected to the exhaust pipe (8) to discharge the gas entering through the pump inlet (11).

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