Axial force self-adjusting and balancing device

Abstract

The utility model relates to the technical field of axial force balance, in particular to an axial force self-adjusting and balancing device which comprises a pump body, a pump shaft rotationally connected in the pump body and an impeller arranged on the pump shaft, a connecting cylinder is fixedly connected to the impeller, and a transmission part is fixedly connected to the pump shaft. An axial force balance assembly used for preventing the impeller and the pump shaft from moving is arranged in the pump body and comprises an isolation hood fixedly connected into the pump body, and a balance telescopic rod is arranged in the isolation hood. According to the axial force balancing assembly, when the centrifugal pump works, the counter-acting force generated by the tension spring pulls the moving rod and the balancing plate, so that the counter-acting force is generated on the impeller, and the thrust action borne by the impeller is offset, namely, the small axial force generated when the flow is small is offset in the flow increasing process.

Description

Technical Field

[0001] This utility model relates to the field of axial force balancing technology, and in particular to a device for self-adjusting axial force balancing. Background Technology

[0002] During the operation of a centrifugal pump, when the impeller rotates, the pressure on the front cover plate (near the suction port) is lower than the pressure on the rear cover plate (near the pump chamber). The rear cover plate bears high pressure, while the front cover plate bears low pressure. The pressure between the two cover plates cannot be balanced. The pressure difference directly pushes the impeller towards the suction port, thus forming an axial force. The existence of the axial force will directly push the impeller and pump shaft to move axially, thereby causing axial movement, which in turn produces wear and vibration, thus reducing the service life of the centrifugal pump.

[0003] Therefore, a self-adjusting axial force balancing device is proposed. Utility Model Content

[0004] The purpose of this invention is to provide a self-adjusting axial force balancing device to solve the problems mentioned in the background art.

[0005] To achieve the above objectives, this utility model provides the following technical solution: a self-adjusting axial force balancing device, comprising a pump body, a pump shaft rotatably connected in the pump body, and an impeller disposed on the pump shaft, wherein a connecting cylinder is fixedly connected to the impeller, and a transmission part is fixedly connected to the pump shaft; the pump body is provided with an axial force balancing assembly for preventing the impeller and pump shaft from moving sideways, the axial force balancing assembly including an isolation cover fixedly connected in the pump body, a balancing telescopic rod disposed in the isolation cover, a compression cylinder rotatably connected to the impeller, and a pressure-bearing telescopic rod fixedly connected between the compression cylinder and the pump body.

[0006] Preferably, the connecting cylinder is rotatably connected to the transmission part, the transmission part has a limiting groove, a connecting block is fixedly connected in the connecting cylinder, and the connecting block is slidably connected in the limiting groove.

[0007] Preferably, a balance plate is rotatably connected to the connecting cylinder, a sleeve is fixedly connected to the pump body, and a moving rod is slidably connected in the sleeve.

[0008] Preferably, a tension spring is fixedly connected between the sleeve and the moving rod, and the tension spring is located in the sleeve. The moving rod is connected to the balance plate.

[0009] Preferably, a metal pipe is provided between the balance telescopic rod and the pressure telescopic rod, and the metal pipe passes through the pump body and the isolation cover and is connected to the balance telescopic rod and the pressure telescopic rod respectively. The balance telescopic rod, the pressure telescopic rod and the metal pipe are internally connected and contain hydraulic oil.

[0010] Preferably, a force-bearing plate is provided on one side of the balance plate, and a connecting plate is fixedly connected between the balance plate and the force-bearing plate, and a gap is provided between the force-bearing plate and the balance telescopic rod.

[0011] Preferably, the pump body has a guide groove, and the extrusion cylinder is slidably connected in the guide groove.

[0012] The beneficial effects of this utility model are:

[0013] This invention, by incorporating an axial force balancing component, enables the centrifugal pump to utilize the reaction force generated by the tension spring during operation. This force pulls the moving rod and balance plate, thereby generating a reaction force on the impeller and counteracting the thrust on the impeller. Specifically, it counteracts the small axial force generated when the flow rate is low. As the flow rate increases, the entire device automatically adjusts. The axial force causes the impeller to exert pressure on the compressed telescopic rod through the compression cylinder, causing it to contract. Hydraulic oil then pushes the balance telescopic rod to extend, applying pressure to the balance plate. This results in the impeller receiving the same force in the opposite direction, counteracting the thrust and thus offsetting the larger axial force. The entire device balances the axial force generated by the centrifugal pump, preventing impeller and shaft misalignment due to axial force, which could affect the normal operation of the centrifugal pump and reduce its service life. Attached Figure Description

[0014] To more clearly illustrate the technical solutions in this utility model or the prior art, the drawings used in the description of the embodiments or the prior art will be briefly introduced below. Obviously, the drawings described below are only for this utility model. For those skilled in the art, other drawings can be obtained based on these drawings without creative effort.

[0015] Figure 1 This is a schematic diagram of the overall structure of a self-adjusting balancing axial force device according to an embodiment of the present invention;

[0016] Figure 2 This is a cross-sectional view of a pump body with a self-adjusting balancing axial force device according to an embodiment of the present invention.

[0017] Figure 3 This is a cross-sectional structural diagram of a pump body with a self-adjusting axial force balancing device according to an embodiment of the present invention;

[0018] Figure 4 This is a cross-sectional view of an isolation cover with a self-adjusting axial force balancing device according to an embodiment of the present invention.

[0019] Figure 5 This is a partial cross-sectional structural diagram of an isolation cover with a self-adjusting axial force balancing device according to an embodiment of the present invention;

[0020] Figure 6 This is a schematic diagram of an impeller structure with a self-adjusting balancing axial force device according to an embodiment of the present invention.

[0021] The following are labeled in the diagram: 1. Pump body; 2. Pump shaft; 3. Impeller; 4. Connecting cylinder; 5. Transmission unit; 6. Isolation cover; 7. Balance telescopic rod; 8. Extrusion cylinder; 9. Pressure-bearing telescopic rod; 10. Limiting groove; 11. Connecting block; 12. Balance plate; 13. Sleeve; 14. Moving rod; 15. Tension spring; 16. Metal pipe; 17. Force plate; 18. Connecting plate; 19. Guide groove. Detailed Implementation

[0022] To make the objectives, technical solutions, and advantages of this utility model clearer, the present utility model will be further described in detail below with reference to specific embodiments.

[0023] It should be noted that, unless otherwise defined, the technical or scientific terms used in this utility model should have the ordinary meaning understood by one of ordinary skill in the art to which this utility model pertains. The terms "first," "second," and similar terms used in this utility model do not indicate any order, quantity, or importance, but are merely used to distinguish different components. Terms such as "comprising" or "including" mean that the element or object preceding the word encompasses the elements or objects listed following the word and their equivalents, without excluding other elements or objects. Terms such as "connected" or "linked" are not limited to physical or mechanical connections, but can include electrical connections, whether direct or indirect. Terms such as "upper," "lower," "left," and "right" are used only to indicate relative positional relationships; when the absolute position of the described object changes, the relative positional relationship may also change accordingly.

[0024] like Figures 1 to 6 As shown, a specific embodiment of this utility model provides a self-adjusting axial force balancing device, including a pump body 1, a pump shaft 2 rotatably connected in the pump body 1, and an impeller 3 disposed on the pump shaft 2. A connecting cylinder 4 is fixedly connected to the impeller 3, and a transmission part 5 is fixedly connected to the pump shaft 2. An axial force balancing component is provided in the pump body 1 to prevent the impeller 3 and the pump shaft 2 from moving sideways. By setting the axial force balancing component, the axial force generated by the centrifugal pump during operation can be offset, thereby achieving the effect of balancing the axial force and preventing the impeller 3 and the pump shaft 2 from moving sideways due to the axial force and damaging the centrifugal pump. The axial force balancing component includes an isolation cover 6 fixedly connected in the pump body 1, a balancing telescopic rod 7 disposed in the isolation cover 6, a compression cylinder 8 rotatably connected to the impeller 3, and a pressure-bearing telescopic rod 9 fixedly connected between the compression cylinder 8 and the pump body 1.

[0025] like Figures 1 to 6As shown, specifically, the connecting cylinder 4 is rotatably connected to the transmission part 5. The transmission part 5 has a limiting groove 10. A connecting block 11 is fixedly connected in the connecting cylinder 4, and the connecting block 11 is slidably connected in the limiting groove 10. When the centrifugal pump is working, the pump shaft 2 rotates, driving the transmission part 5 to rotate. Under the cooperation of the connecting block 11 and the limiting groove 10, the transmission part 5 drives the connecting cylinder 4 to rotate, thereby driving the impeller 3 to rotate through the connecting cylinder 4. At this time, the impeller 3 rotates normally, enabling the centrifugal pump to start working.

[0026] A balance plate 12 is rotatably connected to the connecting sleeve 4, and a sleeve 13 is fixedly connected to the pump body 1. A moving rod 14 is slidably connected in the sleeve 13, and a tension spring 15 is fixedly connected between the sleeve 13 and the moving rod 14, with the tension spring 15 located in the sleeve 13. The moving rod 14 is connected to the balance plate 12, specifically through a bearing connection, so that the moving rod 14 can remain stable and unaffected when the balance plate 12 rotates. This is existing technology and will not be elaborated further. However, as the impeller 3 rotates, an axial force is generated. When the flow rate is relatively small, the axial force is also relatively small. The axial force pushes the impeller 3 to move towards the inlet of the pump body 1, that is, it applies a thrust to it. The impeller 3 is subjected to... The thrust, i.e., the thrust applied to the connecting cylinder 4, pulls the moving rod 14 through the balance plate 12. The moving rod 14 moves within the sleeve 13, and the tension spring 15, under the action of tension, gradually extends and generates a reaction force. Meanwhile, the impeller 3, under the action of thrust, undergoes a slight movement, causing the connecting block 11 to move within the limiting groove 10. The reaction force generated by the tension spring 15 counteracts the thrust applied to the balance plate 12, thereby counteracting the thrust applied to the impeller 3, i.e., counteracting the axial force generated, maintaining stability, and preventing the impeller 3 from shifting and affecting the service life of the centrifugal pump. During this process, the pump shaft 2 is not subjected to thrust and therefore does not move due to the axial force, avoiding the impact of pump shaft 2 movement.

[0027] like Figures 1 to 6As shown, specifically, in the above process, when the centrifugal pump is operating with a small flow rate, it needs to balance the axial force. The axial force is small, and it is balanced by the reaction force of the tension spring 15. With the axial force balanced, the impeller 3 moves a negligible distance, which does not affect the normal operation of the centrifugal pump. A metal pipe 16 is provided between the balancing telescopic rod 7 and the pressure-bearing telescopic rod 9, and the metal pipe 16 passes through the pump body 1 and the isolation cover 6, connecting to the balancing telescopic rod 7 and the pressure-bearing telescopic rod 9 respectively. Hydraulic oil is provided internally between the balancing telescopic rod 7, the pressure-bearing telescopic rod 9, and the metal pipe 16. When the flow rate suddenly increases, the axial force generated by the centrifugal pump increases. The tension spring 15 cannot achieve the effect of balancing the axial force. At this time, the impeller 3 is subjected to a large thrust. The impeller 3 causes the connecting cylinder 4 to move on the transmission part 5. The movement of the impeller 3 pushes the extrusion cylinder 8, thereby pushing the pressure-bearing telescopic rod 9 to be stressed. The pressure-bearing telescopic rod 9 is stressed and contracts, thereby pushing the internal hydraulic oil through the metal pipe 16 into the balance telescopic rod 7, causing the balance telescopic rod 7 to gradually extend. At the same time, the movement of the impeller 3 drives the balance plate 12 on the transmission part 5 to move. The balance plate 12 pushes the force plate 17 to gradually move closer to the balance telescopic rod 7 through the connecting plate 18.

[0028] A force-bearing plate 17 is provided on one side of the balance plate 12, and a connecting plate 18 is fixedly connected between the balance plate 12 and the force-bearing plate 17. There is a gap between the force-bearing plate 17 and the balance telescopic rod 7. Therefore, the balance telescopic rod 7 and the force-bearing plate 17 are close to each other and the gap between them is very small. This allows them to press against each other in a very short time. At this time, the force-bearing plate 17 cannot move due to the pressure of the balance telescopic rod 7, so the balance plate 12 cannot move, that is, the impeller 3 cannot move. The force that pushes the force-bearing plate 17 to prevent it from moving comes from the pressure telescopic rod 9 being compressed and pushing the hydraulic oil to push the balance telescopic rod 7 to extend. That is, the axial force is used to restrict the movement of the impeller 3 in the opposite direction, so that the axial force can be canceled in time, thereby maintaining the stability of the impeller 3 and preventing it from moving due to the axial force, which would affect the normal use and service life of the centrifugal pump.

[0029] Therefore, it can be seen that when the axial force is small, it can be offset by the tension spring 15. When the axial force increases, the entire device can automatically adjust by the cooperation between the balance telescopic rod 7 and the pressure telescopic rod 9 to offset the axial force. At the same time, during the adjustment process, when the balance telescopic rod 7 and the force plate 17 are close to each other, the tension spring 15 will not reach its maximum extension. When the centrifugal pump stops working, the tension spring 15 will contract and reset, thereby pulling the moving rod 14 to move, which in turn drives the balance plate 12 to reset and move. The pump body 1 is provided with a guide groove 19, and the extrusion cylinder 8 is slidably connected in the guide groove 19. During the operation of the centrifugal pump, the extrusion cylinder 8 is in the guide groove 19 and is limited by the guide groove 19, so that it can maintain stable movement in the lateral direction. Furthermore, the cooperation between the balance telescopic rod 7, the pressure telescopic rod 9 and the metal pipe 16 must be kept sealed. Maintaining this seal to prevent hydraulic oil leakage is existing technology and will not be described in detail.

[0030] Those skilled in the art should understand that the discussion of any of the above embodiments is merely exemplary and is not intended to imply that the scope of the present invention (including the claims) is limited to these examples; within the framework of the present invention, the technical features of the above embodiments or different embodiments can also be combined, the steps can be implemented in any order, and there are many other variations of the different aspects of the present invention as described above, which are not provided in the details for the sake of brevity.

[0031] This utility model is intended to cover all such substitutions, modifications, and variations that fall within the broad scope of the appended claims. Therefore, any omissions, modifications, equivalent substitutions, improvements, etc., made within the spirit and principles of this utility model should be included within the protection scope of this utility model.

Claims

1. A device for self-adjusting axial force balancing, comprising a pump body (1), a pump shaft (2) rotatably connected in the pump body (1), and an impeller (3) disposed on the pump shaft (2), wherein a connecting cylinder (4) is fixedly connected to the impeller (3), and a transmission part (5) is fixedly connected to the pump shaft (2), characterized in that: The pump body (1) is provided with an axial force balancing assembly to prevent the impeller (3) and pump shaft (2) from moving sideways. The axial force balancing assembly includes an isolation cover (6) fixedly connected in the pump body (1), a balancing telescopic rod (7) is provided in the isolation cover (6), a squeezing cylinder (8) is rotatably connected to the impeller (3), and a pressure-bearing telescopic rod (9) is fixedly connected between the squeezing cylinder (8) and the pump body (1).

2. The self-adjusting axial force balancing device according to claim 1, characterized in that, The connecting cylinder (4) is rotatably connected to the transmission part (5). A limiting groove (10) is provided on the transmission part (5). A connecting block (11) is fixedly connected in the connecting cylinder (4), and the connecting block (11) is slidably connected in the limiting groove (10).

3. The self-adjusting axial force balancing device according to claim 1, characterized in that, A balance plate (12) is rotatably connected to the connecting cylinder (4), and a sleeve (13) is fixedly connected to the pump body (1). A moving rod (14) is slidably connected in the sleeve (13).

4. A self-adjusting axial force balancing device according to claim 3, characterized in that, A tension spring (15) is fixedly connected between the sleeve (13) and the moving rod (14), and the tension spring (15) is located in the sleeve (13). The moving rod (14) is connected to the balance plate (12).

5. A self-adjusting balancing axial force device according to claim 1, characterized in that, A metal pipe (16) is provided between the balance telescopic rod (7) and the pressure telescopic rod (9), and the metal pipe (16) passes through the pump body (1) and the isolation cover (6) and is connected to the balance telescopic rod (7) and the pressure telescopic rod (9) respectively. The balance telescopic rod (7), the pressure telescopic rod (9) and the metal pipe (16) are internally connected and hydraulic oil is provided.

6. A self-adjusting axial force balancing device according to claim 3, characterized in that, The balance plate (12) has a force plate (17) on one side, and a connecting plate (18) is fixedly connected between the balance plate (12) and the force plate (17). There is a gap between the force plate (17) and the balance telescopic rod (7).

7. A self-adjusting axial force balancing device according to claim 1, characterized in that, The pump body (1) is provided with a guide groove (19), and the extrusion cylinder (8) is slidably connected in the guide groove (19).

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