Spinning lock type inner core integrated multi-stage pump without main pressure-bearing stud

Abstract

The invention discloses a spin lock type inner core integrated multi-stage pump without a main pressure-bearing stud. The pump mainly comprises a pump inner core and a spin lock shell, the pump inner core is detachably installed on the inner wall of the spin lock shell, the pump inner core comprises a pump shaft, a spin lock cover and a connecting cover are installed at the two ends of the pump shaft respectively, a plurality of spin lock lugs are arranged on the circumference of the spin lock cover, and a plurality of blocking pieces are arranged at an opening in the side, close to the spin lock cover, of the spin lock shell. A gap between every two blocking pieces forms a spin locking groove allowing the spin locking lug to pass through, a sliding groove is formed in the circumference of the inner wall of the spin locking shell, a through hole is formed in the outer wall of the side, close to the spin locking cover, of the spin locking shell, and the wedge-shaped locking block penetrates through the spin locking shell through the through hole and is fixed to the outer wall of the spin locking shell through a compression bolt. The pump inner core integrated assembly structure is designed, so that a system pipeline does not need to be disassembled when the pump is maintained, and only the whole pump inner core needs to be directly disassembled from the pressure-bearing shell, the field construction amount is greatly reduced, the maintenance time is shortened, and the disassembly and assembly difficulty of a pump set is simplified.

Description

Technical Field

[0001] The invention relates to the field of multistage pumps, in particular to the technical field of a rotary lock type inner core integrated multistage pump without a main pressure-bearing stud. Background Art

[0002] First, in the prior art, each time a horizontal multi-stage pump is repaired, the system pipe flanges connected to the pump inlet and outlet must be removed before the entire pump can be removed for repair. The on-site construction is cumbersome, the operation is complicated, and it takes a lot of time.

[0003] Secondly, in the prior art, the bearing support components on both sides of the horizontal multi-stage pump are respectively installed on the pressure-bearing end covers on both sides, and the pressure-bearing end covers are then installed on both ends of the pressure-bearing shell. As a result, when the pump is disassembled, the bearing components must be removed first before the pump core can be removed. The pump core cannot be pulled out of the pressure shell as a whole, which greatly increases the difficulty of disassembly and assembly.

[0004] Third, in the prior art, horizontal multistage pumps require very high pressure bearing capacity, so the studs connecting the pressure-bearing shell and the end cover on the high-pressure side are often large in size and large in number, resulting in the need to design the pressure-bearing shell and the end cover to have a large outer diameter, which ultimately results in the disadvantages of large pump unit dimensions and heavy overall weight, and also increases the manufacturing cost of the pump. Large-sized studs require large installation and disassembly torques, and the large number of them causes a large number of fasteners to be disassembled and assembled, which takes a long time, greatly increasing maintenance time and maintenance costs.

[0005] Finally, in the prior art, the seal between the pressure-bearing shell and the high-pressure side end cover adopts a metal wound gasket type static seal. Because it requires strict clamping force to ensure the sealing, the requirements for the studs are further increased. At the same time, too much or too little clamping force will cause the seal to be unreliable in long-term use, thereby reducing the safety and reliability of the pump. Summary of the invention

[0006] In order to solve the above problems, that is, to solve the problems raised by the above background technology, the present invention proposes a multi-stage pump with an integrated inner core of a rotary lock type without a main pressure-bearing stud, comprising a pump inner core and a rotary lock shell, wherein the pump inner core is detachably mounted on the inner wall of the rotary lock shell, the pump inner core comprises a pump shaft, and a rotary lock cover and a connecting cover are respectively mounted on both ends of the pump shaft, a plurality of rotary lock ears are arranged on the circumference of the rotary lock cover, a plurality of blocking sheets are arranged at an opening on one side of the rotary lock shell close to the rotary lock cover, a rotary lock groove is formed by the gap between each two blocking sheets for the rotary lock ears to pass through, a sliding groove is arranged on the circumference of the inner wall of the rotary lock shell, a through hole is opened on the outer wall of the rotary lock shell close to the rotary lock cover, a wedge-shaped locking block passes through the rotary lock shell through the through hole and is fixed to the outer wall of the rotary lock shell through a clamping bolt.

[0007] The present invention is further configured as follows: a non-drive-end bearing support component, an adjustment pad group, a guide vane, an impeller, a middle section and a suction section and a drive-end bearing support component are installed on the pump shaft; the non-drive-end bearing support component is installed on the outside of the rotary lock cover, the drive-end bearing support component is installed on the outside of the connecting cover, and the adjustment pad group, guide vane, impeller, middle section and suction section are installed on the inner sides of the rotary lock cover and the connecting cover in sequence.

[0008] The present invention is further configured as follows: the number of the blocking pieces is the same as the number of the rotary lock ears.

[0009] The present invention is further configured as follows: the number of the through hole, the wedge-shaped locking block and the clamping bolt are two, and the two through holes are respectively located on two sides of the blocking piece.

[0010] The present invention is further configured as follows: the overall outer diameter of the pump inner core is smaller than the corresponding inner diameter of the rotary lock shell.

[0011] The present invention is further configured as follows: the lock groove of the lock shell and the outer side of the lock ear of the lock cover are matched with a circumferential inclined surface, the lock groove of the lock shell and the inner side of the lock ear of the lock cover are matched with a conical surface, and the wedge-shaped locking block and the lock ear are matched with a radial inclined surface.

[0012] The present invention has the following beneficial effects: on the one hand, the present invention eliminates the traditional structure in which the bearing support components at both ends are installed on the end covers, and the end covers are installed on both sides of the pressure shell, and is designed as an integrated assembly structure of the pump core, so that when the pump is repaired, there is no need to disassemble the system pipeline, and the pump core as a whole only needs to be directly removed from the pressure shell, which greatly reduces the on-site construction workload, shortens the maintenance time, and simplifies the difficulty of disassembling and assembling the pump group; on the other hand, the stud and nut connection between the pressure shell and the end cover is eliminated, and is designed as a twist-lock structure, which not only reduces the overall size of the pump group and reduces the weight of the whole machine, but also makes the disassembly and assembly of the pump simple, fast and reliable, greatly saving the disassembly and assembly time and maintenance cost; at the same time, the three mating surfaces of the twist-lock structure in the present invention work in linkage, and finally realize high-efficiency conical surface sealing, which is used as a backup seal for conventional radial sealing, and the sealing safety and reliability are greatly improved; so that the strict requirements of offshore platforms and offshore floating devices on equipment size, weight, safety and reliability, and rapid maintenance are fully met. BRIEF DESCRIPTION OF THE DRAWINGS

[0013] Figure 1 It is the overall front view of the present invention;

[0014] Figure 2 It is a detailed view of the rotary lock housing of the present invention;

[0015] Figure 3 It is a side view of the rotary lock housing and the rotary lock cover of the present invention;

[0016] Figure 4The figure is a schematic diagram of the overall disassembly of the pump inner core of the present invention.

[0017] 1. Non-drive end bearing support component, 2. Twist lock cover, 3. Twist lock housing, 4. Wedge-shaped locking block, 5. Clamping bolt, 6. Adjustment gasket assembly, 7. Guide vane, 8. Impeller, 9. Middle section, 10. Pump shaft, 11. Suction section, 12. Connecting cover, 13. Drive end bearing support component, 14. Blocking plate, 15. Twist lock groove, 16. Twist lock ear, 17. Slide groove. DETAILED DESCRIPTION

[0018] The preferred embodiments of the present invention are described below with reference to the accompanying drawings. It should be understood by those skilled in the art 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.

[0019] The present invention proposes a rotary lock type inner core integrated multi-stage pump without main pressure-bearing studs, comprising a pump inner core and a rotary lock shell 3, wherein the pump inner core is detachably mounted on the inner wall of the rotary lock shell 3, the pump inner core comprises a pump shaft 10, and a rotary lock cover 2 and a connecting cover 12 are respectively mounted on both ends of the pump shaft 10, a plurality of rotary lock ears 16 are arranged on the circumference of the rotary lock cover 2, a plurality of blocking sheets 14 are arranged at an opening on one side close to the rotary lock cover 2, and a rotary lock groove 15 is formed between each two blocking sheets 14, and a sliding groove 17 is arranged on the circumference of the inner wall of the rotary lock shell 3, the rotary lock ear 16 on the rotary lock cover 2 is aligned with the rotary lock groove 15 to enter the rotary lock shell 3, and slides along the sliding groove 17 until it is aligned with the blocking sheet 14. The rotary lock shell 3 is provided with a through hole on the outer wall on the side close to the rotary lock cover 2, and the wedge-shaped locking block 4 passes through the rotary lock shell 3 through the through hole and is fixed to the outer wall of the rotary lock shell 3 by a clamping bolt 5.

[0020] The pump shaft 10 is equipped with a non-drive-end bearing support component 1, an adjustment pad group 6, a guide vane 7, an impeller 8, a middle section 9, a suction section 11 and a drive-end bearing support component 13; the non-drive-end bearing support component 1 is installed on the outside of the rotary lock cover 2, the drive-end bearing support component 13 is installed on the outside of the connecting cover 12, and the adjustment pad group 6, guide vane 7, impeller 8, middle section 9 and suction section 11 are installed on the inner sides of the rotary lock cover 2 and the connecting cover 12 in sequence.

[0021] The number of the blocking pieces 14 is the same as the number of the twist lock ears 16 .

[0022] There are two through holes, two wedge-shaped locking blocks 4 and two clamping bolts 5, and the two through holes are respectively located on both sides of the blocking plate 14. When the rotary lock cover 2 is screwed into the rotary lock shell 3, the two wedge-shaped locking blocks 4 are inserted into the through holes in turn, and are evenly compressed by the clamping bolts 5 and fixed on the outer wall of the rotary lock shell 3. One end of the wedge-shaped locking block 4 that penetrates into the rotary lock shell 3 can clamp the rotary lock ear 16, and push the rotary lock ear 16 to rotate axially at a slight angle to achieve locking, thereby promoting axial centering and compression of the pump inner core, and finally achieving efficient sealing and anti-loosening.

[0023] The overall outer diameter of the pump inner core is smaller than the corresponding inner diameter of the rotary lock housing 3, so that the pump core can be directly installed into the interior of the rotary lock housing.

[0024] The outer sides of the rotary lock groove 15 of the rotary lock shell 3 and the rotary lock ear 16 of the rotary lock cover 2 are matched with circumferential inclined surfaces, the rotary lock groove 15 of the rotary lock shell 3 and the inner sides of the rotary lock ear 16 of the rotary lock cover 2 are matched with conical surfaces, and the wedge-shaped locking block 4 and the rotary lock ear 16 are matched with radial inclined surfaces. The three coordinated linkage effects enable the rotary lock cover to promote circumferential rotation, promote automatic axial centering of the pump core and promote compression, realize efficient sealing of the high-pressure side cone surface, and anti-loosening locking functions.

[0025] During use: when it is necessary to remove the pump core, first unscrew the clamping bolt 5, remove the wedge-shaped locking block 4, rotate the pump core along the slide groove 17, screw the rotary lock ear 16 out of the rotary lock groove 15, and remove the pump core directly to the outside; when it is necessary to install the pump core, first align the rotary lock ear 16 with the rotary lock groove 15, put the rotary lock ear 16 of the rotary lock cover 2 into the slide groove 17, rotate the pump core, align the rotary lock ear 16 with the blocking sheet 14, insert the two wedge-shaped locking blocks 4 from the through hole of the rotary lock shell 3, and tighten and fix them on the rotary lock shell 3 through the clamping bolt 5, lock the rotary lock ear 16, and then lock the entire pump core.

[0026] Although the present invention has been described with reference to preferred embodiments, various modifications may be made thereto and parts thereof may be replaced by 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.

[0027] 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.

[0028] In addition, it should be noted that in the description of the present invention, unless otherwise clearly specified and limited, the terms "installed", "connected", and "connected" 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 specific circumstances.

[0029] 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.

[0030] So far, the technical solutions of the present invention have 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 multi-stage pump with a rotary lock inner core and an integrated inner core without a main pressure-bearing stud, comprising a pump inner core and a rotary lock housing (3), characterized in that: The pump inner core is detachably mounted on the inner wall of the rotary lock shell (3), the pump inner core comprises a pump shaft (10), and a rotary lock cover (2) and a connecting cover (12) are respectively mounted on both ends of the pump shaft (10), a plurality of rotary lock ears (16) are arranged on the circumference of the rotary lock cover (2), a plurality of blocking sheets (14) are arranged at an opening on one side of the rotary lock shell (3) close to the rotary lock cover (2), a rotary lock groove (15) is formed in the gap between each two blocking sheets (14) for the rotary lock ears (16) to pass through, a sliding groove (17) is arranged on the circumference of the inner wall of the rotary lock shell (3), a through hole is opened on the outer wall of the rotary lock shell (3) close to the rotary lock cover (2), a wedge-shaped locking block (4) passes through the rotary lock shell (3) through the through hole, and is fixed to the outer wall of the rotary lock shell (3) by a clamping bolt (5).

2. A rotary lock type inner core integrated multi-stage pump without main pressure-bearing studs as claimed in claim 1, characterized in that: The pump shaft (10) is provided with a non-driving end bearing support component (1), an adjustment pad group (6), a guide vane (7), an impeller (8), a middle section (9), a suction section (11) and a driving end bearing support component (13); the non-driving end bearing support component (1) is installed on the outside of a rotary lock cover (2), the driving end bearing support component (13) is installed on the outside of a connecting cover (12), and the adjustment pad group (6), the guide vane (7), the impeller (8), the middle section (9) and the suction section (11) are installed on the inside of the rotary lock cover (2) and the connecting cover (12) in sequence.

3. A rotary lock type inner core integrated multi-stage pump without main pressure-bearing studs as claimed in claim 1, characterized in that: The blocking pieces (14) and the twist lock ears (16) are of the same number.

4. A rotary lock type inner core integrated multi-stage pump without main pressure-bearing studs as claimed in claim 1, characterized in that: There are two through holes, two wedge-shaped locking blocks (4) and two clamping bolts (5), and the two through holes are respectively located on two sides of the blocking plate (14).

5. A rotary lock type inner core integrated multi-stage pump without main pressure-bearing studs as claimed in claim 1, characterized in that: The overall outer diameter of the pump inner core is smaller than the corresponding inner diameter of the rotary lock shell (3).

6. A rotary lock type inner core integrated multi-stage pump without main pressure-bearing studs as claimed in claim 1, characterized in that: The outer sides of the rotary lock groove (15) of the rotary lock shell (3) and the rotary lock ear (16) of the rotary lock cover (2) are matched with circumferential inclined surfaces, the inner sides of the rotary lock groove (15) of the rotary lock shell (3) and the rotary lock ear (16) of the rotary lock cover (2) are matched with conical surfaces, and the wedge-shaped locking block (4) and the rotary lock ear (16) are matched with radial inclined surfaces.

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