Cantilever type horizontal two-stage centrifugal pump

Abstract

The utility model discloses a cantilever type horizontal two-stage centrifugal pump, which relates to the technical field of centrifugal pumps, aims to solve the problems that the centrifugal pump is insufficient in lift and difficult to disassemble and repair, and comprises a pump body and a bearing box body, the pump body and the bearing box body are connected through a bolt, and a heavy shaft is arranged in a cavity of the pump body and the bearing box body. A pump cover is installed at the tail end of a pump body through a stud, a middle section is fixedly installed in a pump body cavity and in the middle of the pump body through a stud, the pump body is divided into a first-stage section and a second-stage section through the middle section and an interstage shaft sleeve, and a first-stage impeller, the interstage shaft sleeve and a second-stage impeller are sequentially locked and fixedly installed at one end of a heavy shaft through impeller nuts. A guide vane is arranged at an outlet of the first-stage impeller; a bearing assembly is installed in the bearing box body cavity, and supporting feet are installed at the bottom end outside the bearing box body cavity. The pump body is reasonable and compact in structure, the performance, adaptability and stability of the centrifugal pump are remarkably improved, and complex industrial conveying tasks are efficiently coped with.

Description

Technical Field

[0001] The utility model relates to the technical field of centrifugal pumps, in particular to a cantilever horizontal two-stage centrifugal pump. Background Art

[0002] Centrifugal pumps are critical fluid conveying equipment in many industrial fields such as chemical, petroleum, refining, pharmaceutical, acid making, printing and dyeing, and food. Traditional single-stage cantilever centrifugal pumps are widely used in these fields. However, with the development of production technology and the increase in demand, they have gradually exposed significant performance shortcomings. Specifically, in actual use, single-stage cantilever centrifugal pumps often face the dilemma of insufficient head, making it difficult to complete the task of conveying chemical raw materials and products in long-distance or high-resistance transmission lines.

[0003] At the same time, although the existing two-stage cantilever horizontal centrifugal pump can make up for the problem of insufficient head to a certain extent, it has many structural defects. The unreasonable design of the pump body structure makes it extremely inconvenient to disassemble during equipment maintenance and repair. Not only does it increase maintenance time and cost and reduce production efficiency, but it is also difficult to conduct comprehensive and convenient observation and maintenance of the inside of the pump cavity, making it difficult to detect and handle potential faults in a timely manner, which seriously affects the overall reliability and stability of the equipment, increases the risk of sudden equipment failure and shutdown, and thus has an adverse impact on the continuity of industrial production.

[0004] Therefore, developing a cantilever horizontal two-stage centrifugal pump that can meet the requirements of higher head transportation and has the advantages of reasonable structure and convenient maintenance has become a technical problem that needs to be urgently solved in the industrial field. Utility Model Content

[0005] In order to solve the above problems, that is, to solve the problems raised by the above background technology, the utility model proposes a cantilever horizontal two-stage centrifugal pump, which includes a pump body and a bearing housing, the pump body and the bearing housing are connected by bolts and a heavy shaft is arranged in the cavity, a pump cover is installed at the end of the pump body through a stud, and a middle section is fixedly installed in the middle of the pump body through a stud in the pump body cavity, the pump body is divided into a first stage section and a second stage section by the middle section and the interstage sleeve, and one end of the heavy shaft is fixedly installed with a first-stage impeller, an interstage impeller, and a second stage impeller through an impeller nut. A shaft sleeve and a secondary impeller, a guide vane is provided at the outlet of the first-stage impeller; an inlet pressure measuring hole is provided at the inlet of the pump body, an outlet pressure measuring hole is provided at the top outlet of the pump body, and a drainage hole is provided at the bottom end of the pump body; a bearing assembly is installed in the bearing housing cavity, a support foot is installed at the bottom end outside the bearing housing cavity, a lifting hole is provided on one side of the top end of the bearing housing, a refueling hole is provided in the middle of the top end, an oil drainage hole is provided in the middle of the bottom end, a visible oil window hole and an oil cup hole are provided on the side wall, and a drainage hole is provided at the bottom end near the connection with the pump body.

[0006] The utility model is further configured as follows: the bearing assembly is interference fit with the other end of the heavy shaft, the bearing assembly includes an angular contact ball bearing and a deep groove ball bearing, the angular contact ball bearings are provided in two groups, a first bearing cover is installed on the outer side of the angular contact ball bearing by bolts, a second bearing cover is installed on the outer side of the deep groove ball bearing by bolts, and a dust disk is installed on the outer side of the second bearing cover.

[0007] The utility model is further configured as follows: the pump cover is installed with a mechanical seal through studs, and the mechanical seal is arranged between the pump cover and the bearing housing.

[0008] The utility model is further configured as follows: a plurality of balancing holes are provided on the secondary impeller.

[0009] The beneficial technical effects of the utility model are as follows: the pump body structure of the utility model is reasonable and compact, which significantly improves the performance, adaptability and stability of the centrifugal pump and can efficiently cope with complex industrial transportation tasks. It is extremely convenient to disassemble, and the maintenance is convenient and efficient. It is convenient to overhaul, replace and clean the parts, which is conducive to in-depth observation of the inside of the pump chamber, timely discovery and treatment of potential problems, reducing the failure rate, reducing maintenance time and cost, extending the life of the equipment, and ensuring production continuity. The rigorous design ensures reliable operation, the strength of the pressure-bearing parts meets the standards, there is no leakage risk, and it can remain stable even after long-term high-load operation, providing safe and efficient fluid transportation guarantees for industrial production and reducing failure losses. The structural design is reasonable, the manufacturing process is simple, and the manufacturing cost is reduced; its high reliability and easy maintainability reduce maintenance costs and downtime losses, and the service life is long. It is highly practical and widely applicable to many fields, meeting the needs of fluid transportation in various working conditions; the parts are highly interchangeable, easy to maintain and upgrade, improving the versatility and flexibility of the equipment, and reducing the difficulty and cost of management and maintenance. BRIEF DESCRIPTION OF THE DRAWINGS

[0010] Figure 1 Shown is a schematic diagram of the structure of the utility model.

[0011] In the figure: 1. pump body, 2. impeller nut, 3. middle section, 4. secondary impeller, 5. pump cover, 6. bearing housing, 7. angular contact ball bearing, 8. first bearing cover, 9. heavy-duty shaft, 10. support foot, 11. deep groove ball bearing, 12. second bearing cover, 13. dust plate, 14. interstage sleeve, 15. guide vane, 16. first stage impeller, 17. oil drain hole, 18. visible oil window hole, 19. oil cup hole, 20. oil filling hole, 21. lifting hole, 22. drain hole, 23. balance hole, 24. drainage hole, 25. mechanical seal, 26. inlet pressure measuring hole, 27. outlet pressure measuring hole. DETAILED DESCRIPTION

[0012] Please refer to the attached Figure 1Those skilled in the art should understand that these embodiments are only used to explain the technical principles of the present invention and are not intended to limit the protection scope of the present invention.

[0013] The utility model proposes a cantilever horizontal two-stage centrifugal pump, comprising a pump body 1 and a bearing housing 6, the pump body 1 and the bearing housing 6 are connected by bolts and a heavy-duty shaft 9 is arranged in the cavity, a pump cover 5 is installed at the end of the pump body 1 through a stud, in the cavity of the pump body 1, a middle section 3 is fixedly installed in the middle of the pump body 1 through a stud to prevent the middle section 3 from rotating during the rotation of the centrifugal pump, the pump body 1 is divided into a first stage section and a second stage section by the middle section 3 and an interstage shaft sleeve 14, one end of the heavy-duty shaft 9 is sequentially locked and fixed with a first-stage impeller 16, an interstage shaft sleeve 14 and a secondary impeller 4 through an impeller nut 2, the first-stage impeller 16, the interstage shaft sleeve 14 and the secondary impeller 4 are forced to rotate by a key on the heavy-duty shaft 9, and a guide vane 15 is arranged at the outlet of the first-stage impeller 16, and the guide vane 15 guides the water flow and evenly flows into the next stage section.

[0014] A bearing assembly is installed in the cavity of the bearing housing 6, and a support foot 10 is installed at the bottom end outside the cavity of the bearing housing 6. The support foot 10 helps to reduce the vibration of the centrifugal pump during operation.

[0015] The first stage section is provided with an impeller nut 2, a guide vane 15 and a primary impeller 16, and the second stage section is provided with a secondary impeller 4.

[0016] The bearing assembly is interference fit with the other end of the heavy shaft 9, and the bearing assembly includes an angular contact ball bearing 7 and a deep groove ball bearing 11. Two groups of angular contact ball bearings 7 are provided. A first bearing cover 8 is installed on the outer side of the angular contact ball bearing 7 by bolts, and a second bearing cover 12 is installed on the outer side of the deep groove ball bearing 11 by bolts. The deep groove ball bearing 11 is positioned by the second bearing cover 12, and a dust disk 13 is installed on the outer side of the second bearing cover 12.

[0017] The pump cover 5 is installed with a mechanical seal 25 through studs, so that the pump body can work normally and stably. The mechanical seal 25 is arranged between the pump cover 5 and the bearing housing 6. The mechanical seal 25 prevents leakage of the conveyed medium and also prevents external impurities from entering the interior of the equipment.

[0018] A plurality of balancing holes 23 are provided on the secondary impeller 4, and the balancing holes 23 can balance the axial force.

[0019] An inlet pressure measuring hole 26 is provided at the inlet of the pump body 1, and an outlet pressure measuring hole 27 is provided at the top outlet of the pump body 1. The inlet pressure measuring hole 26 and the outlet pressure measuring hole 27 are convenient for measuring the inlet pressure and the outlet pressure, and can accurately monitor the performance of the pump to achieve the required head. A drain hole 24 is provided at the bottom of the pump body 1. After the pump stops working, the medium in the pump cavity is discharged through the drain hole 24 to prevent the medium from solidifying and crystallizing due to temperature changes and to facilitate maintenance and inspection.

[0020] A lifting hole 21 is provided on one side of the top of the bearing housing 6. When assembling the pump, it is lifted by installing the lifting screws; a refueling hole 20 is provided in the middle of the top of the bearing housing 6. Refueling is carried out through the refueling hole 20 before the pump works, so that the bearings can be lubricated during the operation of the pump; an oil drain hole 17 is provided in the middle of the bottom end of the bearing housing 6. After the pump stops working, the oil needs to be discharged through the oil drain hole 17 to prevent oil oxidation and contamination, avoid oil leakage and meet the maintenance and maintenance requirements. The side wall of the bearing housing 6 is provided with a visible oil window hole 18 and an oil cup hole 19. The visible oil window hole 18 is convenient for observing the oil level and the state of the oil; the oil cup hole 19 is used to install the oil cup, so that it can continuously lubricate the bearings and control the changes in the amount of lubricating oil and prevent corrosion of components during the operation of the pump; a drain hole 22 is provided at the bottom of the bearing housing 6 near the connection with the pump body 1. When the pump is working, if there is leakage through the mechanical seal 25, the leakage can be discharged in time.

[0021] The first-stage impeller 16 and the guide vane 15 together can form a stage of the pump. When the pump is filled with water, the impeller rotates at a high speed driven by the motor, so that when the impeller presses out the liquid, a low-pressure area is generated at the pump inlet, and a pressure difference is formed with the outside to generate an attraction effect. The same volume of liquid enters the pump suction chamber through the suction pipe, so that the medium can be kept continuously flowing when the impeller rotates. The rotation of the impeller drives the liquid to rotate, so that the liquid energy increases and the head is generated; the liquid is pressed out from the first-stage impeller 16 and enters the guide vane 15, and the guide vane 15 sends the liquid to the inlet of the secondary impeller 4. Under the same principle, the liquid is pressed out from the outlet of the secondary impeller 4 and then sent out from the pump outlet; in order to balance the axial force, a balancing hole 23 is set on the secondary impeller 4, so that the secondary impeller 4 and the pump cover 5 cooperate to form a balancing chamber. Through the balancing hole 23, the pressure at the inlet of the secondary impeller 4 is close to the pressure in the balancing chamber, thereby reducing the axial force on the secondary impeller 4, and the remaining axial forces are all borne by the bearing.

[0022] Although the present invention has been described with reference to preferred embodiments, various modifications may be made thereto and parts thereof may be replaced with equivalents without departing from the scope of the present invention. In particular, the various technical features mentioned in the various embodiments may be combined in any manner as long as there is no structural conflict. The present invention is not limited to the specific embodiments disclosed herein, but includes all technical solutions falling within the scope of the claims.

[0023] In the description of the present invention, the terms "center", "upper", "lower", "left", "right", "vertical", "horizontal", "inner", "outer" and the like indicating directions or positional relationships are based on the directions or positional relationships shown in the drawings, which are only for the convenience of description, and do not indicate or imply that the device or element must have a specific orientation, be constructed and operated in a specific orientation, and therefore cannot be understood as limiting the present invention. In addition, the terms "first", "second", and "third" are used for descriptive purposes only, and cannot be understood as indicating or implying relative importance.

[0024] In addition, it should be noted that in the description of the present invention, unless otherwise clearly specified and limited, the terms "installation", "connection" and "connection" should be understood in a broad sense, for example, it can be a fixed connection, a detachable connection, or an integral connection; it can be a mechanical connection or an electrical connection; it can be a direct connection, or it can be indirectly connected through an intermediate medium, or it can be the internal communication of two components. For those skilled in the art, the specific meanings of the above terms in the present invention can be understood according to the specific circumstances.

[0025] The term "comprise" or any other similar term is intended to cover a non-exclusive inclusion, such that a process, article, or apparatus / device that includes a list of elements includes not only those elements but also other elements not expressly listed, or elements inherent to such process, article, or apparatus / device.

[0026] So far, the technical solution of the present invention has been described in conjunction with the preferred embodiments shown in the accompanying drawings. However, it is easy for those skilled in the art to understand that the protection scope of the present invention is obviously not limited to these specific embodiments. Without departing from the principle of the present invention, those skilled in the art can make equivalent changes or substitutions to the relevant technical features, and the technical solutions after these changes or substitutions will fall within the protection scope of the present invention.

Claims

1. A cantilever horizontal two-stage centrifugal pump, comprising a pump body (1) and a bearing housing (6), wherein the pump body (1) and the bearing housing (6) are connected by bolts and a heavy shaft (9) is arranged in the cavity, and a pump cover (5) is installed at the end of the pump body (1) by means of studs, characterized in that: In the cavity of the pump body (1), a middle section (3) is fixedly installed in the middle of the pump body (1) by means of studs, the pump body (1) is divided into a first section and a second section by means of the middle section (3) and the interstage shaft sleeve (14), one end of the heavy shaft (9) is fixedly installed with a first-stage impeller (16), an interstage shaft sleeve (14) and a secondary impeller (4) in sequence by means of an impeller nut (2), and a guide vane (15) is provided at the outlet of the first-stage impeller (16); An inlet pressure measuring hole (26) is provided at the inlet of the pump body (1), an outlet pressure measuring hole (27) is provided at the top outlet of the pump body (1), and a drainage hole (24) is provided at the bottom end of the pump body (1); A bearing assembly is installed in the cavity of the bearing housing (6), a support foot (10) is installed at the bottom end outside the cavity of the bearing housing (6), a lifting hole (21) is provided on one side of the top end of the bearing housing (6), a refueling hole (20) is provided in the middle of the top end, an oil drain hole (17) is provided in the middle of the bottom end, a visible oil window hole (18) and an oil cup hole (19) are provided on the side wall, and a drain hole (22) is provided at the bottom end near the connection with the pump body (1).

2. A cantilever horizontal two-stage centrifugal pump according to claim 1, characterized in that: The bearing assembly is interference-fitted with the other end of the heavy-duty shaft (9), and the bearing assembly comprises an angular contact ball bearing (7) and a deep groove ball bearing (11). The angular contact ball bearing (7) is provided in two groups, a first bearing cover (8) is installed on the outer side of the angular contact ball bearing (7) by means of bolts, a second bearing cover (12) is installed on the outer side of the deep groove ball bearing (11) by means of bolts, and a dust plate (13) is installed on the outer side of the second bearing cover (12).

3. A cantilever horizontal two-stage centrifugal pump according to claim 1, characterized in that: The pump cover (5) is mounted with a mechanical seal (25) via studs, and the mechanical seal (25) is arranged between the pump cover (5) and the bearing housing (6).

4. A cantilever horizontal two-stage centrifugal pump according to claim 1, characterized in that: The secondary impeller (4) is provided with a plurality of balancing holes (23).

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