Axial flow pump
By adopting the limiting surface and circumferential limiting assembly design in the axial flow pump, the reliable fixing problem between the moving ring assembly and the rotating shaft is solved, the sealing performance and operating stability are improved, and the efficient operation and long life of the equipment are ensured.
Patent Information
- Application Number
- CN202510485216.X
- Authority / Receiving Office
- CN · China
- Patent Type
- Applications(China)
- Current Assignee / Owner
- Filing Date
- 2025-04-17
- Publication Date
- 2025-07-08
AI Technical Summary
In the prior art, it is difficult to achieve reliable circumferential fixation between the moving ring assembly and the rotating shaft, especially in high-speed rotation or complex operating conditions, which tends to cause relative sliding or offset, resulting in a degradation of sealing performance.
The axial flow pump design is adopted to achieve circumferential fixation through the limiting surface between the spring seat and the rotation shaft, and the circumferential limiting assembly and elastic parts or magnetic design are used to ensure the circumferential fixation between the moving ring seat, the spring seat and the moving ring, and avoid relative sliding or offset.
It improves the stability and reliability of the mechanical seal structure, effectively prevents fluid leakage, and ensures efficient operation and long service life of the equipment under high-speed rotation or complex working conditions.
Smart Images
Figure CN120273934A_ABST
Abstract
Description
Technical Field
[0001] This application relates to the field of fluid machinery, and particularly to an axial flow pump. Background Art
[0002] Mechanical Seal is a shaft sealing device used for rotating equipment (such as pumps, compressors, agitators, etc.).
[0003] Basic Structure of Mechanical Seal Moving ring and stationary ring: A pair of precisely matched friction pairs. The moving ring rotates with the shaft, and the stationary ring is fixed to the equipment housing. Auxiliary seals: O-rings, bellows, etc., to prevent the medium from leaking between the stationary ring and the housing or between the moving ring and the shaft. Spring / bellow: Provides axial elastic force to ensure the tight fit of the moving and stationary rings.
[0004] In the prior art, in order to achieve synchronous rotation between the moving ring assembly and the rotating shaft, friction force (interference fit) is usually used in the design to generate sufficient torque transmission between the moving ring assembly and the rotating shaft.
[0005] However, there is a problem with the above conventional means in practical applications: It is difficult to achieve reliable circumferential fixation between the moving ring assembly and the rotating shaft. Especially under high-speed rotation or complex working conditions, the moving ring assembly is prone to relative sliding or offset, resulting in a decrease or even failure of the sealing performance. Summary of the Invention
[0006] In order to ensure the synchronous rotation of the moving ring assembly with the shaft, this application provides an axial flow pump.
[0007] The axial flow pump provided by this application adopts the following technical solutions: An axial flow pump includes a spring seat, a moving ring seat, a moving ring, and a circumferential limiting component. The spring seat is used to connect to the rotating shaft. The spring seat and the rotating shaft are axially fixed and circumferentially fixed. The moving ring seat is used to connect to the rotating shaft. The moving ring seat and the rotating shaft can slide axially. There is the circumferential limiting component between the spring seat and the moving ring seat, so that the spring seat and the moving ring seat are circumferentially fixed. There is the circumferential limiting component between the moving ring seat and the moving ring, so that the moving ring seat and the moving ring are circumferentially fixed.
[0008] By adopting the above technical solution, axial and circumferential fixation is achieved between the spring seat and the rotating shaft, thereby ensuring that the spring seat can rotate synchronously with the rotating shaft and remain stable. The moving ring seat is axially slidably connected to the rotating shaft and can move axially relative to the rotating shaft. At the same time, circumferential fixation between the moving ring seat and the spring seat is achieved through the circumferential limiting component, avoiding relative sliding or offset of the moving ring seat under high-speed rotation or complex working conditions. In addition, circumferential fixation is also achieved between the moving ring seat and the moving ring through the circumferential limiting component, further improving the reliability of the entire mechanical seal structure, effectively preventing fluid leakage, and ensuring the efficient operation and long service life of the equipment.
[0009] Preferably, the circumferential limiting component includes an active piece and a passive piece. One end of the passive piece along the circumference of the rotating shaft is used to touch the active piece. Between the spring seat and the moving ring seat: the active piece is connected to the spring seat, and the passive piece is connected to the moving ring seat.
[0010] By adopting the above technical solution, circumferential fixation between the spring seat and the moving ring seat is achieved through the cooperation of the active piece and the passive piece, which can effectively prevent circumferential sliding or offset of the moving ring seat relative to the spring seat. This design significantly improves the reliability of the mechanical seal structure under high-speed rotation or complex working conditions, ensuring the stability and durability of the sealing performance.
[0011] Preferably, an elastic member is further included. The elastic member is connected between the spring seat and the moving ring seat. When the elastic member is subjected to an axial force or not subjected to a force, there is a circumferential spacing between the passive piece and the active piece along the circumference of the moving ring seat.
[0012] By adopting the above technical solution, the setting of the elastic member can keep a certain circumferential spacing between the passive piece and the active piece in both the state where the elastic member is stressed and not stressed, thereby avoiding unnecessary contact or interference between the passive piece and the active piece in the non-working state; at the same time, providing a buffering effect to avoid damage caused by rigid contact between the moving ring seat and the spring seat. This design helps to reduce the frictional loss between components and ensure higher stability and reliability of the moving ring assembly when rotating with the rotating shaft.
[0013] Preferably, when the elastic member is not subjected to a force, there is an axial spacing between the passive piece and the active piece along the moving ring seat.
[0014] By adopting the above technical solution, during use, the elastic member is compressed and the passive piece approaches the active piece. When the elastic member is not stressed, there is a spacing along the axial direction of the moving ring seat between the passive piece and the active piece, which facilitates avoiding excessive axial contact between the passive piece and the active piece during transportation and storage, thereby reducing the friction and wear between the two and improving the reliability and service life of the mechanical seal structure.
[0015] Preferably, an elastic ring is further included. The elastic ring is located between the moving ring and the moving ring seat.
[0016] By adopting the above technical solution, during the rotation of the rotating shaft, the elastic action of the elastic ring can provide buffering and helps to keep the relative position between the moving ring and the moving ring seat fixed, thereby ensuring that the moving ring rotates synchronously with the rotating shaft and improving the reliability and service life of the mechanical seal structure.
[0017] Preferably, an elastic member, a moving magnetic ring and a static magnetic ring are further included. The elastic member is connected between the spring seat and the moving ring seat, and the elastic member makes the spring seat and the moving ring seat tend to approach each other. The moving magnetic ring is connected to the moving ring seat. The static magnetic ring is used to be connected to the shaft seat, and the rotating shaft is rotatably connected to the shaft seat. The magnetic force between the static magnetic ring and the moving magnetic ring makes the spring seat and the moving ring seat tend to move away from each other.
[0018] By adopting the above technical solution, during the working process, the magnetic force between the static magnetic ring and the moving magnetic ring makes the moving ring overcome the pulling force of the elastic member and press against the static ring.
[0019] The continuous wear of the moving ring reduces the distance between the static magnetic ring and the moving magnetic ring, increases the deformation amount of the elastic member, and further leads to an increase in the magnetic force and the pulling force. Moreover, the increase amplitude of the magnetic force is greater than that of the pulling force, which is beneficial for the moving ring to press closer to the static ring and ensures the performance of the mechanical seal.
[0020] Preferably, a shaft magnetic ring is further included. The shaft magnetic ring is used to be connected to the rotating shaft. The magnetic force between the shaft magnetic ring and the moving magnetic ring makes the spring seat and the moving ring seat tend to move away from each other.
[0021] By adopting the above technical solution, in the initial state, it is beneficial to ensure that the position of the moving ring seat satisfies that the magnetic force between the magnetic ring and the moving magnetic ring is greater than the pulling force of the elastic member, so that the moving ring can press against the static ring.
[0022] Preferably, a static ring and a support ring are further included. The static ring is used to be connected to the shaft seat, and the rotating shaft is rotatably connected to the shaft seat. The support ring is used to connect between the stationary ring and the shaft seat, and the support ring has elasticity.
[0023] By adopting the above technical solution, the connection between the stationary ring and the shaft seat ensures the stable installation of the stationary components, and the elastic design of the support ring can effectively absorb the vibration and impact generated during the operation of the equipment, improve the sealing performance between the stationary ring and the shaft seat, and thus improve the stability of the mechanical seal structure.
[0024] In summary, the present application includes at least one of the following beneficial technical effects: 1. Through the design of the limiting surface between the spring seat and the rotating shaft, when the limiting surface touches the rotating shaft, the circumferential fixation between the two is realized, ensuring the synchronous rotation between the spring seat and the rotating shaft, and effectively avoiding relative sliding or deviation under high-speed rotation or complex working conditions; 2. The circumferential limiting component is connected between the spring seat and the moving ring seat, further enhancing the circumferential fixation relationship between the two, and improving the stability and reliability of the mechanical seal structure; 3. Through the multi-stage circumferential limiting design, the reliable fixation problem between the moving ring assembly and the rotating shaft is effectively solved, and the sealing performance and operation stability of the axial flow pump under high-speed rotation or complex working conditions are significantly improved. Description of the Drawings
[0025] Figure 1 is a schematic diagram of an axial flow pump.
[0026] Figure 2 is a schematic diagram of a mechanical seal assembly.
[0027] Figure 3 is a schematic diagram of the usage state of the mechanical seal assembly in Embodiment 1.
[0028] Figure 4 is a schematic diagram of the mechanical seal assembly in Embodiment 2.
[0029] Description of the reference numerals: 11, pump body; 12, shaft seat; 2, spring seat; 21, limiting surface; 3, moving ring seat; 4, circumferential limiting component; 41, active piece; 42, passive piece; 5, elastic member; 61, moving ring; 62, elastic ring; 71, stationary ring; 72, support ring; 81, shaft magnetic ring; 82, moving magnetic ring; 83, stationary magnetic ring. Detailed Description of the Embodiments
[0030] The following further describes the present application in detail with reference to the drawings.
[0031] Referring to Figure 1 and Figure 2 , an axial flow pump disclosed in an embodiment of the present application includes a pump body 11, a rotating shaft, and a mechanical seal assembly.
[0032] The pump body 11 has a shaft seat 12. The rotating shaft is rotatably connected to the shaft seat 12. A mechanical seal assembly is connected between the rotating shaft and the shaft seat 12 to achieve sealing.
[0033] Referring to Figure 2 , the mechanical seal assembly includes a spring seat 2, a dynamic ring seat 3, and a circumferential limiting assembly 4.
[0034] The spring seat 2 is used to coaxially sleeve outside the rotating shaft, and the spring seat 2 and the rotating shaft are axially fixed. Specifically, the axial fixing method between the spring seat 2 and the rotating shaft can be a circlip, a shaft sleeve, an interference fit, etc.
[0035] The spring seat 2 is provided with a limiting surface 21, and at least two points on the limiting surface 21 are at unequal distances from the axis of the spring seat 2. The limiting surface 21 is used to touch the rotating shaft to achieve circumferential fixation between the spring seat 2 and the rotating shaft.
[0036] In the attached drawings: the limiting surface 21 is a plane, the limiting surface 21 is parallel to the axis of the rotating shaft, and two limiting surfaces 21 are provided. In other embodiments: the limiting surface 21 can be an arc surface, and the center of the arc surface does not coincide with the axis of the rotating shaft.
[0037] The dynamic ring seat 3 is used to coaxially and slidably sleeve outside the rotating shaft.
[0038] There are two circumferential limiting assemblies 4. One circumferential limiting assembly 4 is connected between the spring seat 2 and the dynamic ring seat 3 to achieve circumferential fixation between the spring seat 2 and the dynamic ring seat 3.
[0039] The circumferential limiting assembly 4 includes a driving piece 41 and a driven piece 42.
[0040] A plurality of driving pieces 41 are equidistantly arranged along the circumference of the rotating shaft; the driven piece 42 is used to be inserted between adjacent driving pieces 41 so that one end of the driven piece 42 along the rotation circumference is used to touch the driving piece 41.
[0041] Between the spring seat 2 and the dynamic ring seat 3: the driving piece 41 is connected to the side of the spring seat 2 facing the dynamic ring seat 3; the driven piece 42 is connected to the side of the dynamic ring seat 3 facing the spring seat 2.
[0042] In the attached drawings: three driving pieces 41 are provided, and three driven pieces 42 are equidistantly arranged along the circumference of the driving seat.
[0043] The mechanical seal assembly further includes an elastic member 5.
[0044] The elastic member 5 is located between the spring seat 2 and the dynamic ring seat 3. One end of the elastic member 5 is fixedly connected to the spring seat 2, and the other end of the elastic member 5 is fixedly connected to the dynamic ring seat 3.
[0045] When the elastic member 5 is subjected to an axial force or not subjected to a force, there is a circumferential spacing between the driven piece 42 and the driving piece 41 along the circumference of the dynamic ring seat 3; When the elastic member 5 is not subjected to force, there is a distance between the passive sheet 42 and the active sheet 41 along the axial direction of the dynamic ring seat 3 .
[0046] In the accompanying drawings: the elastic member 5 includes a coil spring, and the coil spring is used to be sleeved outside the rotating shaft.
[0047] The mechanical seal assembly further includes a dynamic ring 61 and an elastic ring 62 .
[0048] The moving ring 61 is located on the side of the moving ring seat 3 away from the elastic member 5, and the moving ring 61 is used to be sleeved outside the rotating shaft. The elastic ring 62 is located between the moving ring 61 and the moving ring seat 3, and the elastic ring 62 is used to be sleeved outside the rotating shaft.
[0049] Another circumferential limiting component 4 is connected between the dynamic ring seat 3 and the dynamic ring 61 to achieve circumferential fixation between the dynamic ring seat 3 and the dynamic ring 61 .
[0050] Between the dynamic ring seat 3 and the dynamic ring 61 : the active plate 41 is connected to the side of the dynamic ring seat 3 away from the spring seat 2 ; the passive plate 42 is connected to the outer periphery of the dynamic ring 61 .
[0051] In any circumferential limit assembly 4 , the sum of the central angles of all active plates 41 and all passive plates 42 is less than 360°.
[0052] The mechanical seal assembly further includes a stationary ring 71 and a support ring 72 .
[0053] The stationary ring 71 is used to be connected to the shaft seat 12 . The stationary ring 71 is used for the rotating shaft to pass through. The stationary ring 71 is located on the side of the dynamic ring 61 away from the dynamic ring seat 3 , so that the dynamic ring 61 and the stationary ring 71 can fit each other.
[0054] The support ring 72 is located between the stationary ring 71 and the shaft seat 12 . The support ring 72 is elastic and is used for the rotating shaft to pass through.
[0055] The elastic ring 62 and the supporting ring 72 can both be rubber rings.
[0056] Embodiment 1 of the present application Reference Figure 2 and Figure 3 The elastic member 5 makes the spring seat 2 and the dynamic ring seat 3 tend to move away from each other, so that the elastic force of the elastic member 5 can be used to make the dynamic ring 61 close to the static ring 71.
[0057] The implementation principle of an axial flow pump implemented in this application is: through a multi-stage circumferential limit design, the problem of reliable fixation between the dynamic ring 61 component and the rotating shaft is effectively solved, and the sealing performance and operation stability of the axial flow pump under high-speed rotation or complex working conditions are significantly improved.
[0058] Specifically: Through the design of the limiting surface 21 between the spring seat 2 and the rotating shaft, when the limiting surface 21 touches the rotating shaft, circumferential fixation between the two is achieved, ensuring synchronous rotation between the spring seat 2 and the rotating shaft, effectively avoiding relative sliding or offset under high-speed rotation or complex working conditions; A circumferential limiting component 4 is connected between the spring seat 2 and the dynamic ring seat 3, and another circumferential limiting component 4 is connected between the dynamic ring seat 3 and the dynamic ring 61, further enhancing the circumferential fixation relationship between components and improving the stability and reliability of the mechanical seal structure.
[0059] Embodiment 2 of the present application The difference from Embodiment 1 lies in that Referring to Figure 4 , the elastic member 5 causes the spring seat 2 and the dynamic ring seat 3 to have a tendency to approach each other.
[0060] The mechanical seal assembly further includes a shaft magnetic ring 81, a dynamic magnetic ring 82, and a static magnetic ring 83.
[0061] The shaft magnetic ring 81 is used to connect to the rotating shaft, and the dynamic magnetic ring 82 is connected to the dynamic ring seat 3; the magnetic force between the shaft magnetic ring 81 and the dynamic magnetic ring 82 causes the spring seat 2 and the dynamic ring seat 3 to have a tendency to move away from each other.
[0062] Specifically: The shaft magnetic ring 81 is located on the side of the dynamic magnetic ring 82 away from the dynamic ring 61, and the magnetic force between the shaft magnetic ring 81 and the dynamic magnetic ring 82 is repulsive; the shaft magnetic ring 81 can be directly connected to the rotating shaft, and the shaft magnetic ring 81 can also be connected to the spring seat 2 to indirectly connect to the rotating shaft.
[0063] The static magnetic ring 83 is used to connect to the shaft seat 12; the magnetic force between the static magnetic ring 83 and the dynamic magnetic ring 82 causes the spring seat 2 and the dynamic ring seat 3 to have a tendency to move away from each other.
[0064] Specifically: The static magnetic ring 83 is located on the side of the dynamic magnetic ring 82 facing the dynamic ring 61, and the magnetic force between the static magnetic ring 83 and the dynamic magnetic ring 82 is attractive; the static magnetic ring 83 can be located on the side of the support ring 72 away from the static ring 71.
[0065] During the working process, the magnetic force between the static magnetic ring 83 and the dynamic magnetic ring 82 causes the dynamic ring 61 and the dynamic ring seat 3 to overcome the pulling force of the elastic member 5 and press tightly against the static ring 71.
[0066] When the dynamic ring 61 and / or the static ring 71 continue to wear, the distance between the static magnetic ring 83 and the dynamic magnetic ring 82 decreases, the deformation amount of the elastic member 5 increases, thereby causing the magnetic force and the pulling force to increase, and the increase amplitude of the magnetic force is greater than that of the pulling force, which is beneficial for the dynamic ring 61 to press more tightly against the static ring 71 and ensure the performance of the mechanical seal.
[0067] The implementation principle of Example 2 of this application for an axial flow pump is as follows: Through a multi-stage circumferential limit design, the reliable fixation problem between the dynamic ring 61 assembly and the rotating shaft is effectively solved, significantly improving the sealing performance and operation stability of the axial flow pump under high-speed rotation or complex working conditions.
[0068] Compared with the technical solution of Example 1 (using elastic force to drive the dynamic ring 61 to fit the static ring 71, as the wear amount accumulates, the elastic force decreases, and the mutual extrusion force between the dynamic ring 61 and the static ring 71 decreases), this embodiment uses magnetic force to drive the dynamic ring 61 to fit the static ring 71. As the wear amount accumulates, the mutual extrusion force between the dynamic ring 61 and the static ring 71 increases, ensuring the sealing performance.
[0069] The above are all preferred embodiments of this application. The protection scope of this application is not limited thereby. Therefore, all equivalent changes made according to the structure, shape, and principle of this application should be covered within the protection scope of this application.
Claims
1. An axial flow pump, characterized in that, It includes a spring seat (2), a moving ring seat (3), a moving ring (61) and a circumferential limiting component (4). The spring seat (2) is used to be connected to the rotating shaft. Axial fixation and circumferential fixation are provided between the spring seat (2) and the rotating shaft. The moving ring seat (3) is used to be connected to the rotating shaft. Axial sliding is provided between the moving ring seat (3) and the rotating shaft. The circumferential limiting component (4) is provided between the spring seat (2) and the moving ring seat (3), so that circumferential fixation is provided between the spring seat (2) and the moving ring seat (3). The circumferential limiting component (4) is provided between the moving ring seat (3) and the moving ring (61), so that circumferential fixation is provided between the moving ring seat (3) and the moving ring (61).
2. The axial flow pump according to claim 1, characterized in that, The circumferential limiting component (4) includes a driving piece (41) and a driven piece (42). One end of the driven piece (42) along the circumferential direction of the rotating shaft is used to touch the driving piece (41). Between the spring seat (2) and the moving ring seat (3): the driving piece (41) is connected to the spring seat (2), and the driven piece (42) is connected to the moving ring seat (3).
3. The axial flow pump according to claim 2, wherein, It further includes an elastic member (5). The elastic member (5) is connected between the spring seat (2) and the moving ring seat (3). When the elastic member (5) is subjected to an axial force or not subjected to a force, a spacing along the circumferential direction of the moving ring seat (3) exists between the driven piece (42) and the driving piece (41).
4. The axial flow pump according to claim 3, characterized in that, When the elastic member (5) is not subjected to a force, a spacing along the axial direction of the moving ring seat (3) exists between the driven piece (42) and the driving piece (41).
5. The axial flow pump according to claim 1, characterized in that, It further includes an elastic ring (62). The elastic ring (62) is located between the moving ring (61) and the moving ring seat (3).
6. The axial flow pump according to claim 1, characterized in that, It further includes an elastic member (5), a moving magnetic ring (82) and a static magnetic ring (83). The elastic member (5) is connected between the spring seat (2) and the moving ring seat (3). The elastic member (5) makes the spring seat (2) and the moving ring seat (3) have a tendency to approach each other. The moving magnetic ring (82) is connected to the moving ring seat (3). The static magnetic ring (83) is used to be connected to the shaft seat (12). The rotating shaft is rotatably connected to the shaft seat (12). The magnetic force between the static magnetic ring (83) and the moving magnetic ring (82) makes the spring seat (2) and the moving ring seat (3) have a tendency to move away from each other.
7. The axial flow pump according to claim 6, wherein, It further includes a shaft magnetic ring (81). The shaft magnetic ring (81) is used to be connected to the rotating shaft. The magnetic force between the shaft magnetic ring (81) and the moving magnetic ring (82) makes the spring seat (2) and the moving ring seat (3) have a tendency to move away from each other.
8. The axial flow pump according to claim 1, characterized in that, It further includes a static ring (71) and a support ring (72). The static ring (71) is used to be connected to the shaft seat (12). The rotating shaft is rotatably connected to the shaft seat (12). The support ring (72) is used to be connected between the static ring (71) and the shaft seat (12). The support ring (72) has elasticity.