Vertical multi-stage cylindrical centrifugal pump

Abstract

The utility model discloses a vertical multi-stage cylindrical centrifugal pump which comprises a pump body, a connecting flange is fixedly connected to the pump body, a water inlet pipe is fixedly connected to the top end of the pump body, and a connecting mechanism and a driving mechanism are installed inside and outside the pump body respectively. Through mutual cooperation of the pump body, the inlet horn pipe, the impeller, the flow guide shell, the pump body wear ring and other structures, the flow and outlet pressure of the pump body can be effectively improved, meanwhile, the vertical arrangement occupies a small area, an inlet pipeline of the pump body can be placed underground, the floor space of the ground is effectively saved, and the structure is compact and reasonable; through mutual cooperation of the pump shaft, the supporting seat, the transmission shaft, the motor shaft, the motor and other structures, the pump shaft and the transmission shaft are connected through the second coupler and the clamping sleeve, the overall length of the shaft is effectively reduced, meanwhile, the eccentric tolerance of the pump and the shaft is improved, and the vibration value of the pump is reduced.

Description

Technical Field

[0001] This utility model relates to the field of centrifugal pump technology, specifically a vertical multistage cylindrical bag centrifugal pump. Background Technology

[0002] A centrifugal pump is a pump that uses the centrifugal force generated by the rotation of an impeller to transport liquids. It mainly consists of an impeller, pump body, pump shaft, bearings, sealing rings, and stuffing box. It is widely used in petrochemical, coal chemical, and other chemical industries. Currently, most existing centrifugal pumps have an impeller or similar structure installed in the pump's inlet pipe to guide the incoming water. However, this design requires the pump to be placed horizontally, occupying a large space and hindering subsequent maintenance. Therefore, designing a vertical multistage cylindrical bag centrifugal pump to solve this problem is essential. Utility Model Content

[0003] To address the shortcomings of existing technologies, this utility model provides a vertical multistage cylindrical bag centrifugal pump, which solves the problem that most existing centrifugal pumps have impellers or other structures installed in their inlet pipes to guide the incoming water. However, this setup requires the centrifugal pump to be placed horizontally, which occupies a large space and is not conducive to subsequent maintenance.

[0004] To achieve the above objectives, this utility model is implemented through the following technical solution: a vertical multistage cylindrical bag centrifugal pump, including a pump body, a connecting flange fixedly connected to the pump body, an inlet pipe fixedly connected to the top of the pump body, and a connecting mechanism and a driving mechanism respectively installed inside and outside the pump body;

[0005] The connecting mechanism includes a discharge section assembly fixedly connected to the connecting flange. Several interconnected inlet horn tubes are fixedly connected to the discharge section assembly. A flow guide shell is machined on the inner wall of the inlet horn tubes. A pump shaft is rotatably connected inside the flow guide shell through a first bearing. Several impellers are fixedly connected to the outer wall of the pump shaft. The outer wall of the impellers is clearance-fitted with the inner wall of the flow guide shell. A pump body retainer is connected to the outer wall of the impellers.

[0006] Preferably, the drive mechanism includes a support base fixedly connected to the outside of the discharge section assembly. A mechanical seal assembly is threadedly connected inside the support base via bolts. A drive shaft is rotatably connected inside the mechanical seal assembly. A motor support is fixedly connected to the outside of the support base, and a motor is fixedly connected to the motor support. The motor shaft is connected to the drive shaft via a first coupling. The drive shaft is rotatably connected to the support base via a second bearing. A mesh-type protective cover is provided outside the first coupling, and the mesh-type protective cover is fixedly connected to the motor support.

[0007] Preferably, a balance drum is mounted on the drive shaft.

[0008] Preferably, the pump shaft and the drive shaft are connected by a second coupling.

[0009] Preferably, the inner wall of the second coupling is fitted with a retaining sleeve.

[0010] Preferably, a water outlet pipe is fixedly connected to the bottom end of the discharge section assembly.

[0011] Beneficial effects

[0012] This utility model provides a vertical multistage cylindrical bag centrifugal pump, which has the following beneficial effects:

[0013] Through the cooperation of the pump body, inlet bell pipe, impeller, guide shell and pump body inlet ring and other structures, the flow rate and outlet pressure of the pump body can be effectively improved. At the same time, the vertical setting has a small footprint, and the pump body inlet pipe can be placed underground, effectively saving ground space. The structure is compact and reasonable.

[0014] Through the cooperation of structures such as pump shaft, support base, drive shaft, motor shaft and motor, the pump shaft and drive shaft are connected by a second coupling and ferrule, which effectively reduces the overall length of the shaft, improves the eccentricity tolerance of the pump and shaft, and reduces the vibration value of the pump. Attached Figure Description

[0015] Figure 1 This is a schematic diagram of the structure of this utility model.

[0016] Figure 2 This is a side view of the present invention.

[0017] Figure 3 This is a partially enlarged schematic diagram of the present invention.

[0018] Figure 4 This is a partially enlarged schematic diagram of the present invention.

[0019] In the diagram: 1. Pump body; 2. Inlet bell pipe; 3. Impeller; 4. Pump body inlet ring; 5. Guide shell; 6. First bearing; 7. Pump shaft; 8. Discharge section assembly; 9. Second bearing; 10. Support base; 11. Drive shaft; 12. Second coupling; 13. Compression fitting; 14. Balance drum; 15. Mechanical seal assembly; 16. Connecting flange; 17. Motor; 18. Motor shaft; 19. First coupling; 20. Motor support; 21. Inlet pipe; 22. Outlet pipe; 23. Mesh-type protective cover. Detailed Implementation

[0020] The technical solutions of the present utility model will be clearly and completely described below with reference to the accompanying drawings of the embodiments. Obviously, the described embodiments are only some embodiments of the present utility model, and not all embodiments. Based on the embodiments of the present utility model, all other embodiments obtained by those of ordinary skill in the art without creative effort are within the protection scope of the present utility model.

[0021] Please see Figure 1-4 This utility model provides a technical solution: a vertical multistage cylindrical bag centrifugal pump, including a pump body 1, a connecting flange 16 fixedly connected to the pump body 1, an inlet pipe 21 fixedly connected to the top of the pump body 1, and a connecting mechanism and a driving mechanism respectively installed inside and outside the pump body 1.

[0022] The connecting mechanism includes a discharge section assembly 8 fixedly connected to the connecting flange. A plurality of interconnected inlet horn tubes 2 are fixedly connected to the discharge section assembly 8. A flow guide shell 5 is machined on the inner wall of the inlet horn tubes 2. A pump shaft 7 is rotatably connected inside the flow guide shell 5 through a first bearing 6. A plurality of impellers 3 are fixedly connected to the outer wall of the pump shaft 7. The outer wall of the impellers 3 is clearance-fitted with the inner wall of the flow guide shell 5. A pump body retainer 4 is connected to the outer wall of the impellers 3.

[0023] The inlet horn tube 2 effectively increases the inlet suction area, reduces the inlet flow velocity, and lowers the net positive suction head (NPSH), allowing the pump installation height to be lowered. Each impeller 3 is equipped with a pump body inlet ring 4, which reduces the pump leakage, effectively improving pump efficiency and reducing operating costs. At the same time, the use of a guide shell 5 can reduce the outer diameter of the pump body 1, saving space and the overall foundation space.

[0024] In this embodiment, the driving mechanism is further configured such that the driving mechanism includes a support base 10 fixedly connected to the outside of the discharge section assembly 8, a mechanical seal assembly 15 is connected to the inside of the support base 10 by bolts and threads, a transmission shaft 11 is rotatably connected to the inside of the mechanical seal assembly 15, a motor support 20 is fixedly connected to the outside of the support base 10, and a motor 17 is fixedly connected to the motor support 20. The motor shaft 18 of the motor 17 is connected to the transmission shaft 11 through a first coupling 19, and the transmission shaft 11 is rotatably connected to the support base 10 through a second bearing 9. A mesh-type protective cover 23 is provided on the outside of the first coupling 19, and the mesh-type protective cover 23 is fixedly connected to the motor support 20.

[0025] The first coupling 19 adopts a diaphragm coupling structure to reduce the impact of misalignment between the drive shaft 11 and the motor shaft 18 on the safety of the unit, making the operation more reliable. The mechanical seal 15 structure can effectively prevent pump leakage. The mesh cover plate 23 can prevent unsafe hazards caused by accidental contact during operation, and can also show the pump rotation direction to prevent reverse rotation.

[0026] In this embodiment, a balance drum 14 is further configured to be mounted on the drive shaft 11;

[0027] The drive shaft 11 is equipped with a balance drum 14 to balance the axial force.

[0028] In this embodiment, the pump shaft 7 and the transmission shaft 11 are connected by a second coupling 12.

[0029] In this embodiment, the inner wall of the second coupling 12 is fitted with a retaining sleeve 13.

[0030] In this embodiment, the bottom end of the discharge section component 8 is fixedly connected to a water outlet pipe 22.

[0031] It is worth noting that all standard parts used in this utility model can be purchased from the market, and irregularly shaped parts can be customized according to the description and drawings. The specific connection methods of each part all adopt conventional methods such as bolts, rivets, and welding, which are mature technologies in the prior art. The models of electrical structure equipment involved can be selected according to the user's needs, as long as they meet the requirements of this application. In addition, the circuit connection adopts conventional connection methods in the prior art. The control, current detection, position feedback, predicted voltage synchronization, and parameter adjustment of the electrical equipment are all existing technologies and will not be described in detail here. All contents not described in detail in this specification belong to the prior art known to those skilled in the art.

[0032] Those skilled in the art can connect the components in this case sequentially. The specific connection and operation sequence should refer to the working principle described below. The detailed connection methods are well-known technologies in the field. The working principle and process are mainly described below.

[0033] Example: When this device is needed, a storage trough can be pre-drilled at the location of use according to the diameter and length of the left end of the pump body 1. Then, the device is vertically inserted into the storage trough and fixed by backfilling. Then, the inlet pipe 21 and outlet pipe 22 are connected to the external pipe in sequence. By placing the device vertically, the ground space can be saved, and the pump body 1 is vertically connected to the inlet pipe 21 and outlet pipe 22, so the structure is more compact and reasonable.

[0034] After connecting the external power supply and control circuit of motor 17, start motor 17. External liquid will enter the pump body 1 through the inlet pipe 21 and then flow upward into the inlet bell pipe 2. At this time, the motor shaft 18 of motor 17 will drive the pump shaft 7 to rotate through the transmission shaft 11, so that the pump shaft 7 drives the impeller 3 to rotate. In this way, multiple impellers 3, together with the guide shell 5, can better draw water upward and discharge it from the outlet pipe 22, thereby achieving the high head characteristic. At the same time, the inlet pipe 21 is set on the pump body 1, and the pump body 1 is connected to the connecting flange 16. In this way, the pump can be disassembled and repaired without disassembling the inlet pipe, which is more convenient and quick.

[0035] It should be noted that, in this document, relational terms such as "first" and "second" are used merely to distinguish one entity or operation from another, and do not necessarily require or imply any such actual relationship or order between these entities or operations. Furthermore, the terms "comprising," "including," or any other variations thereof are intended to cover non-exclusive inclusion, such that a process, method, article, or apparatus that comprises a list of elements includes not only those elements but also other elements not expressly listed, or elements inherent to such a process, method, article, or apparatus. Without further limitations, the phrase "comprising an element defined as..." does not exclude the presence of other identical elements in the process, method, article, or apparatus that includes said element.

[0036] Although embodiments of the present invention have been shown and described, it will be understood by those skilled in the art that various changes, modifications, substitutions and alterations can be made to these embodiments without departing from the principles and spirit of the present invention, the scope of which is defined by the appended claims and their equivalents.

Claims

1. A vertical multistage drum bag centrifugal pump comprising a pump body (1), characterized in that: The pump body (1) is fixed with a connecting flange (16), the top end of the pump body (1) is fixed with a water inlet pipe (21), and the inside and outside of the pump body (1) are respectively provided with a connecting mechanism and a driving mechanism; The connecting mechanism comprises a discharge section assembly (8) fixed with the connecting flange, a plurality of communicating inlet horn pipes (2) are fixed on the discharge section assembly (8), flow guide shells (5) are formed on the inner wall of the inlet horn pipes (2), a pump shaft (7) is rotatably connected in the flow guide shell (5) through a first bearing (6), a plurality of impellers (3) are fixed on the outer wall of the pump shaft (7), the outer wall of the impeller (3) is in gap fit with the inner wall of the flow guide shell (5), and the outer wall of the impeller (3) is connected with a pump body clamping ring (4).

2. A vertical multi-stage cylindrical pocket centrifugal pump according to claim 1, characterized in that, The driving mechanism comprises a supporting seat (10) fixed with the outer side of the discharge section assembly (8), a mechanical sealing assembly (15) is threadedly connected in the supporting seat (10), a transmission shaft (11) is rotatably connected in the mechanical sealing assembly (15), a motor support (20) is fixed on the outer side of the supporting seat (10), a motor (17) is fixed on the motor support (20), a motor shaft (18) of the motor (17) is connected with the transmission shaft (11) through a first coupling (19), the transmission shaft (11) is rotatably connected with the supporting seat (10) through a second bearing (9), and the first coupling (19) is provided with a mesh-shaped guard plate (23), and the mesh-shaped guard plate (23) is fixed with the motor support (20).

3. A vertical multi-stage cylindrical pocket centrifugal pump according to claim 2, characterized in that, The transmission shaft (11) is provided with a balance drum (14).

4. A vertical multi-stage cylindrical pocket centrifugal pump according to claim 1, characterized in that, The pump shaft (7) and the transmission shaft (11) are connected through a second coupling (12).

5. A vertical multi-stage cylindrical pocket centrifugal pump according to claim 4, characterized in that, The second coupling (12) is sleeved with a clamping sleeve (13).

6. A vertical multi-stage cylindrical pocket centrifugal pump according to claim 1, characterized in that, The bottom end of the discharge section assembly (8) is fixed with a water outlet pipe (22).

Images