Mechanical sealing structure for self-circulation centrifugal pump

Abstract

The utility model relates to the technical field of centrifugal pumps, in particular to a mechanical sealing structure for a self-circulation centrifugal pump, which comprises a pump body, a motor, a water inlet pipe and a water outlet pipe, water filling expansion sealing rings are arranged at pipe openings of the water inlet pipe and the water outlet pipe, and a water inlet pipe and a water return pipe which are communicated with the water inlet pipe and the water outlet pipe are respectively arranged on side edges of the water inlet pipe and the water outlet pipe. The end of the water inlet pipe and the end of the water return pipe communicate with the side edge of the water filling expansion sealing ring correspondingly, transverse pipes are fixedly installed on the inner wall of the water inlet pipe and the inner wall of the water return pipe correspondingly, the water inlet pipe communicates with the middles of the transverse pipes, spiral blades are rotationally arranged in the water inlet pipe, and evenly-distributed driving blades are rotationally arranged in the middles of the transverse pipes. According to the mechanical sealing structure for the self-circulation centrifugal pump, in the flowing process of water flow in the pump body, sealing at a pipeline connector can be automatically enhanced, water flow leakage is effectively prevented, and the stability and high efficiency of operation of the centrifugal pump are ensured.

Description

Technical Field

[0001] The utility model belongs to the technical field of centrifugal pumps, and particularly relates to a mechanical seal structure for a self-circulating centrifugal pump. Background Technique

[0002] A self-circulating centrifugal pump is a type of pump equipment that uses the principle of centrifugal force to circulate and transport liquids. It drives the impeller to rotate at high speed through an electric motor, enabling the liquid to obtain centrifugal force within the impeller and be thrown out, thereby forming a low-pressure area at the impeller inlet to attract the liquid to continuously enter the pump and achieve continuous circulation and transportation of the liquid. The self-circulating centrifugal pump has the characteristics of simple structure, convenient operation, high transportation efficiency, wide application range, etc., and is widely used in fields such as chemical industry, petroleum, pharmacy, food, papermaking, and electric power to transport various liquid media to meet different industrial production requirements.

[0003] Most existing self-circulating centrifugal pumps adopt traditional mechanical seal methods, and their sealing effects are often limited by factors such as material wear, installation accuracy, and water flow fluctuations. It is difficult to continuously maintain high-efficiency sealing, easily leading to water leakage and affecting the stability and efficiency of the centrifugal pump operation. Therefore, it is necessary to improve this situation. For this reason, a mechanical seal structure for a self-circulating centrifugal pump is proposed. Summary of the Utility Model

[0004] The purpose of the utility model is to provide a mechanical seal structure for a self-circulating centrifugal pump to solve the problems raised in the above background technique.

[0005] To achieve the above purpose, the utility model adopts the following technical scheme: A mechanical seal structure for a self-circulating centrifugal pump, including a pump body, a motor, a water inlet pipe, and a water outlet pipe. Water-filled expansion seal rings are arranged at the pipe orifices of the water inlet pipe and the water outlet pipe. An inlet pipe and a return pipe connected to them are respectively arranged on the sides of the water inlet pipe and the water outlet pipe. The end parts of the inlet pipe and the return pipe are respectively connected to the sides of the water-filled expansion seal ring. Horizontal pipes are fixedly installed on the inner walls of the inlet pipe and the return pipe. The middle parts of the inlet pipe and the horizontal pipe are connected. A spiral blade is rotatably arranged in the inlet pipe. Uniformly distributed driving blades are rotatably arranged in the middle of the horizontal pipe. The shaft ends of the driving blades are fixedly installed with the shaft ends of the spiral blades.

[0006] Preferably, a flow guide plate is fixedly installed in the horizontal pipe, and the angle of the flow guide plate is set between 35° and 45°.

[0007] Preferably, a filtering part is arranged on the inlet pipe, and a filter screen is arranged in the filtering part.

[0008] Preferably, connection rings are fixedly installed at the ends of the water inlet pipe and the water outlet pipe, and annular connection ports are opened on the connection rings.

[0009] Preferably, the size of the water-filled expansion sealing ring is adapted to the sizes of the water inlet pipe and the water outlet pipe, and a damping is provided between the water-filled expansion sealing ring and the water inlet pipe and the water outlet pipe.

[0010] Preferably, a valve flap is provided at the water outlet of the return pipe.

[0011] In summary, compared with the prior art, the beneficial effects of the present utility model are as follows: By setting up the cooperation of the pump body, the motor, the water inlet pipe, the water outlet pipe, the water-filled expansion sealing ring, the water inlet pipe, the return pipe, the horizontal pipe, the spiral blade, and the driving blade, it is possible to automatically strengthen the seal at the pipe interface during the flow of water in the pump body, effectively prevent water leakage, and ensure the stability and high efficiency of the centrifugal pump operation. BRIEF DESCRIPTION OF THE DRAWINGS

[0012] Figure 1 is a three-dimensional structure diagram of the present utility model;

[0013] Figure 2 is a side view plane structure diagram of the present utility model;

[0014] Figure 3 is a structure diagram of the water inlet pipe of the present utility model;

[0015] Figure 4 is a structure diagram of the water outlet pipe of the present utility model;

[0016] Figure 5 is a top view plane structure diagram of the water outlet pipe of the present utility model;

[0017] Figure 6 is a structure diagram of the horizontal pipe and the water inlet pipe of the present utility model;

[0018] Figure 7 is a structure diagram of the driving blade and the spiral blade of the present utility model;

[0019] Figure 8 is a structure diagram of the return pipe and the valve flap of the present utility model.

[0020] Legend Explanation:

[0021] 1. Pump body; 2. Motor; 3. Water inlet pipe; 4. Water outlet pipe; 5. Water-filled expansion sealing ring; 6. Water inlet pipe; 7. Return pipe; 8. Horizontal pipe; 9. Spiral blade; 10. Driving blade; 11. Deflector; 12. Filter part; 13. Connecting ring; 14. Annular connection port; 15. Valve flap. DETAILED DESCRIPTION OF THE INVENTION

[0022] The following will clearly and completely describe the technical solutions in the embodiments of the present utility model in conjunction with the accompanying drawings in the embodiments of the present utility model. Obviously, the described embodiments are only a part of the embodiments of the present utility model, rather than all the embodiments. All other embodiments obtained by those of ordinary skill in the art based on the embodiments of the present utility model without creative efforts belong to the protection scope of the present utility model.

[0023] Please refer to Figure 1-4 , the present utility model provides a technical solution:

[0024] A mechanical seal structure for a self-circulating centrifugal pump, including a pump body 1, a motor 2, a water inlet pipe 3 and a water outlet pipe 4. Water filling and expanding seal rings 5 are arranged at the pipe orifices of the water inlet pipe 3 and the water outlet pipe 4. An inlet pipe 6 and a return pipe 7 communicated with the water inlet pipe 3 and the water outlet pipe 4 are respectively arranged on the sides of the water inlet pipe 3 and the water outlet pipe 4. The end parts of the inlet pipe 6 and the return pipe 7 are respectively communicated with the sides of the water filling and expanding seal ring 5. Horizontal pipes 8 are fixedly installed on the inner walls of the inlet pipe 6 and the return pipe 7. The middle parts of the inlet pipe 6 and the horizontal pipe 8 are communicated. A spiral blade 9 is rotatably arranged in the inlet pipe 6. Uniformly distributed driving blades 10 are rotatably arranged in the middle of the horizontal pipe 8. The rotating shaft ends of the driving blades 10 are fixedly installed with the rotating shaft ends of the spiral blade 9.

[0025] During use, the pipes are respectively connected to the water inlet pipe 3 and the water outlet pipe 4, and the water filling and expanding seal ring 5 is arranged at the connection of the pipes and the water inlet pipe 3 and the water outlet pipe 4, forming a self-circulating pipeline between the pipes;

[0026] When the self-circulating centrifugal pump works, the motor 2 is started. The output shaft of the motor 2 rotates to drive the impeller in the pump body 1 to rotate. The rotating impeller generates centrifugal force, sucking the water flow from the water inlet pipe 3 and accelerating the discharge from the water outlet pipe 4;

[0027] When the water flow flows in the water inlet pipe 3 or the water outlet pipe 4, a part of the water flow will enter the horizontal pipe 8. The driving blades 10 in the horizontal pipe 8 start to rotate under the impact of the water flow, and then drive the spiral blade 9 to rotate in the inlet pipe 6. During the rotation of the spiral blade 9, the water in the orifices of the horizontal pipe 8 and the inlet pipe 6 flows through the inlet pipe 6 to the side of the water filling and expanding seal ring 5, so that the water filling and expanding seal ring 5 is filled with water and expands, strengthening the sealing effect at the pipe interface. After that, the water flow in the water filling and expanding seal ring 5 is discharged through the return pipe 7;

[0028] The mechanical seal structure for the self-circulating centrifugal pump can automatically strengthen the seal at the pipe interface during the flow of the water flow in the pump body 1, effectively prevent water leakage, and ensure the stability and high efficiency of the operation of the centrifugal pump.

[0029] A flow guide plate 11 is fixedly installed in the horizontal pipe 8, and the angle of the flow guide plate 11 is set between 35° and 45°;

[0030] When the water flow passes through the horizontal pipe 8, the guide plate 11 plays a role in guiding the water flow direction, enabling the water flow to more effectively impact and drive the driving blade 10 to rotate.

[0031] A filtering part 12 is arranged on the water inlet pipe 6, and a filter screen is arranged inside the filtering part 12;

[0032] When the water flow enters the water inlet pipe 6 from the water inlet pipe 3, the filter screen will block impurities from entering the horizontal pipe 8 and the water-filled expansion sealing ring 5, preventing the impurities from affecting the normal operation and service life of the sealing ring.

[0033] Connecting rings 13 are fixedly installed at both ends of the water inlet pipe 3 and the water outlet pipe 4, and annular connecting ports 14 are formed on the connecting rings 13;

[0034] The function of the connecting ring 13 is to facilitate the connection between the water inlet pipe 3 and the water outlet pipe 4 and the external pipeline. The annular connecting port 14 can make the connection more tight and stable, and at the same time, it also helps the water-filled expansion sealing ring 5 to better play the sealing role.

[0035] The size of the water-filled expansion sealing ring 5 is adapted to the pipe orifice sizes of the water inlet pipe 3 and the water outlet pipe 4, and a damping is provided between the water-filled expansion sealing ring 5 and the water inlet pipe 3 and the water outlet pipe 4;

[0036] The size of the water-filled expansion sealing ring 5 is adapted to the pipe orifice sizes of the water inlet pipe 3 and the water outlet pipe 4, ensuring that the sealing ring can closely fit at the pipe orifice. A damping is provided between the water-filled expansion sealing ring 5 and the water inlet pipe 3 and the water outlet pipe 4. The damping can reduce the vibration of the sealing ring during the water filling, expansion and contraction processes, and improve the stability and reliability of the sealing.

[0037] A valve flap 15 is arranged at the orifice of the water return pipe 7;

[0038] The valve flap 15 plays the role of a check valve. When the pump body 1 is working normally, the valve flap 15 remains open, allowing the water flow to pass through smoothly. When the pump body 1 stops working or it is necessary to cut off the water flow, the valve flap 15 will automatically close to prevent the water flow from flowing back or leaking.

[0039] Working principle:

[0040] During use, the pipelines are respectively connected to the water inlet pipe 3 and the water outlet pipe 4, and the water-filled expansion sealing ring 5 is arranged at the connection between the pipelines and the water inlet pipe 3 and the water outlet pipe 4, forming a self-circulation pipeline between the pipelines;

[0041] When the self-circulation centrifugal pump is working, start the motor 2. The output shaft of the motor 2 rotates to drive the impeller inside the pump body 1 to rotate. The rotating impeller generates centrifugal force, sucking the water flow from the water inlet pipe 3 and accelerating the discharge from the water outlet pipe 4;

[0042] When water flows in the inlet pipe 3 or the outlet pipe 4, a part of the water flow will enter the horizontal pipe 8. The driving blade 10 inside the horizontal pipe 8 starts to rotate under the impact of the water flow, and then drives the spiral blade 9 to rotate inside the water inlet pipe 6. During the rotation of the spiral blade 9, the water in the orifices of the horizontal pipe 8 and the water inlet pipe 6 flows through the water inlet pipe 6 to the side of the water-filled expansion sealing ring 5, thereby filling and expanding the water-filled expansion sealing ring 5 internally, strengthening the sealing effect at the pipe interface. After that, the water flow inside the water-filled expansion sealing ring 5 is discharged through the return pipe 7;

[0043] When the water flow passes through the horizontal pipe 8, the guide plate 11 plays a role in guiding the water flow direction, enabling the water flow to more effectively impact and drive the driving blade 10 to rotate;

[0044] When the water flow enters the water inlet pipe 6 from the inlet pipe 3, the filter screen will block impurities from entering the horizontal pipe 8 and the water-filled expansion sealing ring 5, preventing the impurities from affecting the normal operation and service life of the sealing ring;

[0045] The connecting ring 13 facilitates the connection between the inlet pipe 3 and the outlet pipe 4 and the external pipes. The annular connection port 14 can make the connection more tight and stable, and also helps the water-filled expansion sealing ring 5 to better play its sealing role;

[0046] The size of the water-filled expansion sealing ring 5 is adapted to the orifice sizes of the inlet pipe 3 and the outlet pipe 4, ensuring that the sealing ring can closely fit at the pipe orifice. A damping is provided between the water-filled expansion sealing ring 5 and the inlet pipe 3 and the outlet pipe 4. The damping can reduce the vibration of the sealing ring during the water filling, expansion and contraction processes, improving the stability and reliability of the sealing;

[0047] The valve flap 15 functions as a one-way valve. When the pump body 1 is working properly, the valve flap 15 remains open, allowing the water flow to pass through smoothly. When the pump body 1 stops working or it is necessary to cut off the water flow, the valve flap 15 will automatically close to prevent the water flow from flowing back or leaking.

[0048] The above is only a preferred specific embodiment of the present utility model, but the protection scope of the present utility model is not limited thereto. Any person skilled in the art within the technical scope disclosed by the present utility model, according to the technical solution and the inventive concept of the present utility model, makes equivalent substitutions or changes, and all should be covered within the protection scope of the present utility model.

Claims

1. Mechanical seal structure for self-circulating centrifugal pump, comprising a pump body (1), a motor (2), a water inlet pipe (3) and a water outlet pipe (4), characterized in that, A water filling and expanding sealing ring (5) is provided at the pipe openings of the water inlet pipe (3) and the water outlet pipe (4). An inlet pipe (6) and a return pipe (7) communicating with the water inlet pipe (3) and the water outlet pipe (4) respectively are provided on the sides of the water inlet pipe (3) and the water outlet pipe (4). The end parts of the inlet pipe (6) and the return pipe (7) are respectively communicated with the side of the water filling and expanding sealing ring (5). Horizontal pipes (8) are fixedly installed on the inner walls of the inlet pipe (6) and the return pipe (7). The middle of the inlet pipe (6) is communicated with the horizontal pipe (8), and a spiral blade (9) is rotatably arranged in the inlet pipe (6). Uniformly distributed driving blades (10) are rotatably arranged in the middle of the horizontal pipe (8). The shaft end of the driving blade (10) is fixedly installed with the shaft end of the spiral blade (9).

2. The mechanical seal structure for a self-circulating centrifugal pump according to claim 1, wherein A flow guiding plate (11) is fixedly installed in the horizontal pipe (8), and the angle of the flow guiding plate (11) is set between 35° and 45°.

3. The mechanical seal structure for a self-circulating centrifugal pump according to claim 1, characterized in that, A filtering part (12) is provided on the inlet pipe (6), and a filter screen is arranged in the filtering part (12).

4. The mechanical seal structure for a self-circulating centrifugal pump according to claim 1, characterized in that, Connection rings (13) are fixedly installed at the ends of the water inlet pipe (3) and the water outlet pipe (4), and an annular connection port (14) is formed on the connection ring (13).

5. The mechanical seal structure for a self-circulating centrifugal pump according to claim 1, characterized in that, The size of the water filling and expanding sealing ring (5) is adapted to the pipe opening sizes of the water inlet pipe (3) and the water outlet pipe (4), and a damping is provided between the water filling and expanding sealing ring (5) and the water inlet pipe (3) and the water outlet pipe (4).

6. The mechanical seal structure for a self-circulating centrifugal pump according to claim 1, characterized in that, A valve flap (15) is provided at the pipe opening of the return pipe (7).

Images