Axial force loading device and axial force adjustable rotating device

Abstract

The invention discloses an axial force loading device and an axial force adjustable rotating device, and relates to the technical field of axial force application test, and the axial force loading device comprises a stator and a rotor, an air inlet of the stator is used for being connected with an air source, the rotor is used for being coaxially connected with a rotating shaft, and the rotor is coaxially arranged in an exhaust channel of the stator; the outer wall of the rotor and the inner wall of the exhaust channel are arranged in a spaced mode, gas pressure provided by the gas source can directly act on the rotor, so that the rotor can generate axial movement and provide axial force for the rotating shaft, and the outer wall of the rotor and the inner wall of the exhaust channel are arranged in a spaced mode. The rotor does not bear radial force from the stator in the process of moving in the axial direction, and the problem that normal work of the rotating shaft is affected by the radial force is avoided.

Description

Technical Field

[0001] The present invention relates to the technical field of axial force application testing, in particular to an axial force loading device and a rotating device with adjustable axial force. Background Art

[0002] Axial force is a key factor in rotating machinery failure. Excessive axial force can cause axial overload on the bearings, increase bearing cavity temperature, and increase contact stress, which can affect bearing life. If the axial force is too low or reversed, the risk of light-load bearing slippage, friction damage, or impact damage increases. Therefore, axial force is a crucial parameter in rotating machinery design. During the development phase, it is necessary to optimize the axial force design to keep it within a reasonable range to ensure safe and reliable operation of the bearings within their specified lifespan.

[0003] In traditional mechanical systems, axial force application devices usually use piston devices (such as hydraulic cylinders, pneumatic cylinders or electric push rods) to provide thrust to the rotating shaft. Such devices apply axial force to the rotating shaft through the linear motion of the piston rod to achieve axial positioning, pressure loading or motion control.

[0004] However, during the movement of the existing piston-type axial force application device, additional radial force components will be generated due to load eccentricity, installation errors, inconsistent piston circumferential friction or non-collinear movement. This radial force will be transmitted to the rotating shaft, causing the bearing to be subjected to additional loads in non-design directions, affecting the rotation accuracy, and even accelerating bearing wear or causing vibration. Summary of the Invention

[0005] The purpose of the present invention is to provide an axial force loading device and a rotating device with adjustable axial force, which provide axial force to the rotating shaft through a stator and a mover that do not contact each other, thereby eliminating the influence of radial force on the rotating shaft.

[0006] To achieve the above object, the present invention provides the following solutions: The present invention provides an axial force loading device, comprising: a stator, wherein the air inlet of the stator is used to be connected to an air source; and a mover, wherein the mover is used to be coaxially connected to the rotating shaft, the mover is coaxially arranged in the exhaust channel of the stator, and the outer wall of the mover is spaced apart from the inner wall of the exhaust channel.

[0007] As one embodiment, a labyrinth seal assembly is further included, which includes a first grate tooth and a second grate tooth that cooperate with each other, the first grate tooth is installed on the inner wall of the stator, and the second grate tooth is installed on the outer wall of the mover, and the first grate tooth and the second grate tooth are clearance-matched.

[0008] As an embodiment, the stator includes a first part and a second part symmetrically arranged along an axial cross-section of the exhaust passage, and the first part and the second part are detachably connected.

[0009] As an embodiment, the interior of the mover is hollow, and an end of the mover away from the rotating shaft is an air intake end, and the air intake end is connected to the exhaust channel.

[0010] As an embodiment, a pressure sensor is further included, and a sensing end of the pressure sensor is in communication with the air pressure of the exhaust passage.

[0011] As an embodiment, a flow control valve is provided between the air inlet and the air source.

[0012] As an embodiment, a connecting piece is further included, wherein the inlet end of the connecting piece is threadedly connected to the outlet end of the gas source, and the outlet end of the connecting piece is threadedly connected to the gas inlet.

[0013] The present invention also discloses a rotating device with adjustable axial force, comprising: The above-mentioned axial force loading device; a rotating shaft connected to an end of the mover away from the air source; and a support frame, wherein the support frame is arranged at one axial end of the rotating shaft, and the stator is fixedly mounted on the support frame.

[0014] As an embodiment, a threaded hole is provided at one end of the mover away from the air source, and the rotating shaft is threadedly connected to the mover.

[0015] As an embodiment, the support frame is provided with a mounting hole for accommodating the stator, and the stator is connected to the support frame by bolts.

[0016] Compared with the prior art, the present invention has achieved the following technical effects: In the axial force loading device disclosed in the present invention, the air inlet of the stator is used to be connected to the air source, and the mover connected to the rotating shaft is coaxially arranged in the exhaust channel of the stator. The gas pressure provided by the air source can directly act on the mover, so that the mover can generate axial movement and provide axial force for the rotating shaft. The outer wall of the mover is spaced apart from the inner wall of the exhaust channel. Therefore, the mover will not be subjected to radial force from the stator during the axial movement, thereby avoiding the problem of radial force affecting the normal operation of the rotating shaft. BRIEF DESCRIPTION OF THE DRAWINGS

[0017] In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the following briefly introduces the drawings required for use in the embodiments. Obviously, the drawings described below are only some embodiments of the present invention. For ordinary technicians in this field, other drawings can be obtained based on these drawings without paying any creative work.

[0018] Figure 1 Schematic diagram of an axial force loading device in an embodiment of the present invention; Figure 2 Schematic diagram of a rotating device with adjustable axial force according to an embodiment of the present invention; Among them, 1. stator; 2. air source; 3. mover; 4. exhaust channel; 5. first grate teeth; 6. second grate teeth; 7. pressure sensor; 8. connecting part; 9. rotating shaft; 10. support frame. DETAILED DESCRIPTION

[0019] The following will clearly and completely describe the technical solutions in the embodiments of the present invention in conjunction with the accompanying drawings. Obviously, the described embodiments are only part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without making creative efforts are within the scope of protection of the present invention.

[0020] The purpose of the present invention is to provide an axial force loading device and an axial force adjustable rotating device to solve the problems existing in the prior art. By using gas as a power source and without the mover and the stator contacting each other, the effect of only providing axial force to the rotating shaft is achieved.

[0021] In order to make the above-mentioned objects, features and advantages of the present invention more obvious and easy to understand, the present invention is further described in detail below with reference to the accompanying drawings and specific embodiments.

[0022] Please refer to Figure 1-2The axial force loading device disclosed in the embodiment of the present invention includes: a stator 1 and a mover 3; wherein the air inlet of the stator 1 is used to connect to the air source 2, the mover 3 is used to connect to the rotating shaft 9, and the mover 3 and the rotating shaft 9 are coaxially arranged. The mover 3 is arranged in the exhaust channel 4 of the stator 1, and the mover 3 and the exhaust channel 4 of the stator 1 are coaxially arranged, and the outer wall of the mover 3 and the inner wall of the exhaust channel 4 are spaced apart. Its working principle is that the air source 2 provides high-pressure gas to the stator 1, and the high-pressure gas enters the exhaust channel 4 of the stator 1 through the air inlet. The mover 3 is connected to the rotating shaft 9, and the outer wall of the mover 3 and the inner wall of the stator 1 are spaced apart. Under the push of the gas pressure, the mover 3 can generate a movement trend along the axial direction of the exhaust channel 4, thereby providing axial pressure to the rotating shaft 9. During this process, the mover 3 will not contact the stator 1, thereby avoiding the mover 3 from being subjected to radial force due to mutual contact with the stator 1, thereby ensuring the normal operation of the rotating shaft 9.

[0023] It can be understood that although the spacing between the mover 3 and the stator 1 will cause some gas leakage, as long as the amount of gas provided by the gas source 2 per unit time is greater than the leakage of the gap between the mover 3 and the stator 1, it can ensure that the gas source 2 can provide axial thrust for the mover 3.

[0024] In this embodiment, the axial force loading device also includes a labyrinth sealing assembly, which includes a first grate 5 and a second grate 6 that cooperate with each other. The first grate 5 is installed on the inner wall of the stator 1, and the second grate 6 is installed on the outer wall of the mover 3. The first grate 5 and the second grate 6 are clearance-matched. It can be understood that the first grate 5 extends in the axial direction of the mover 3, and the second grate 6 extends in the direction of the inner wall of the stator 1. The first grate 5 and the second grate 6 are staggered along the axial direction of the mover 3, and the first grate 5 and the second grate 6 overlap with each other along the radial direction of the mover 3, thereby forming a labyrinth seal, effectively reducing the leakage of gas in the gap between the mover 3 and the stator 1.

[0025] In this embodiment, the stator 1 includes a first part and a second part symmetrically arranged along the axial cross-section of the exhaust channel 4. The first part and the second part are detachably connected. The detachably connected first part and the second part form a split structure, ensuring the detachable arrangement of the stator 1 and the mover 3.

[0026] Furthermore, the first and second parts are detachably connected via a bolt structure. It is understood that corresponding threaded holes can be provided on the first and second parts without affecting the sealing performance of the stator 1, thereby enabling the first and second parts to be connected together via the bolt structure; or connecting ears can be provided on the outer walls of the first and second parts, with threaded holes provided on the connecting ears, thereby connecting the two parts together via the bolt structure.

[0027] In this embodiment, a sealing strip is provided between the first part and the second part to ensure the sealing effect of the stator 1. Of course, other existing sealing methods can also be used to seal the gap between the first part and the second part, which will not be elaborated here.

[0028] In this embodiment, the inside of the mover 3 is hollow, and the end of the mover 3 away from the rotating shaft 9 is the air inlet end, which is connected to the exhaust channel 4, that is, the mover 3 is a cylindrical structure with one end sealed and the other end open, and the open end serves as the air inlet end of the mover 3. The mover 3 extends into the air inlet channel of the stator 1, and the mover 3 is connected to the air inlet channel through the air inlet end. With this arrangement, the axial overlapping length of the mover 3 and the stator 1 is extended, so that more first comb teeth 5 / second comb teeth 6 can be arranged on the outer wall of the mover 3 / inner wall of the stator 1 along the axial direction, further improving the sealing effect of the device, and the hollow arrangement of the mover 3 reduces the total weight of the mover 3, and reduces the influence of the mover 3's own weight on the radial force. Furthermore, with this hollow setting, when the high-pressure gas enters the mover 3, it will preferentially move along the radial direction of the mover 3, and then be "held" by the mover 3, and then move in the opposite direction, and finally reach the gap between the mover 3 and the stator 1. Compared with directly setting the mover 3 as a solid piston (after the gas hits the end of the piston, it will directly move along the radial direction of the piston to the gap between the mover 3 and the stator 1, and flow out from the gap), the movement path of the gas is extended, the resistance in the gas flow process is increased, and the gas is less likely to leak from the system, thereby reducing the amount of gas loss and reducing costs.

[0029] In this embodiment, the axial force loading device further includes a pressure sensor 7 , the sensing end of the pressure sensor 7 is in air pressure communication with the exhaust passage 4 , and the pressure in the exhaust passage 4 can be monitored in real time through the pressure sensor 7 .

[0030] Furthermore, a mounting hole is provided on the side wall of the stator 1 , and the sensing head of the pressure sensor 7 extends into the exhaust passage 4 of the stator 1 through the mounting hole, and a seal is provided between the pressure sensor 7 and the mounting hole.

[0031] In this embodiment, a flow control valve is provided between the air inlet and the air source 2, and the air intake volume can be adjusted in real time through the flow control valve.

[0032] In this embodiment, the axial force loading device also includes a control module, which is connected to the pressure sensor 7. The control module has a built-in formula: F=P·S, where F is the axial force, P is the pressure, and S is the cross-sectional area of ​​the rotor, and the axial force provided by the device can be directly obtained.

[0033] Furthermore, the flow control valve and the drive mechanism of air source 2 are also connected to the control module. When the control module detects a discrepancy between the axial force provided by the system and a preset value, it automatically adjusts the axial force in real time by controlling the opening of the flow control valve and the power of the drive mechanism of air source 2. Of course, staff can also manually intervene in the axial force adjustment process based on actual needs.

[0034] In this embodiment, the axial force loading device also includes a connecting member 8, the inlet end of the connecting member 8 is threadedly connected to the outlet end of the gas source 2, and the outlet end of the connecting member 8 is threadedly connected to the air inlet. Through the connecting member 8, the gas source 2 and the air inlet of the stator 1 can be detachably connected without changing the outlet size of the gas source 2 and the size of the air inlet of the stator 1.

[0035] An embodiment of the present invention also discloses a rotating device with adjustable axial force, including: the above-mentioned axial force loading device, a rotating shaft 9 and a support frame 10, the rotating shaft 9 is connected to the end of the mover 3 away from the air source 2, the support frame 10 is arranged at one axial end of the rotating shaft 9, and the stator 1 is fixedly installed on the support frame 10. The axial force loading device can apply axial force to the rotating shaft 9 to ensure the stable operation of the rotating device.

[0036] In this embodiment, a threaded hole is provided at the end of the mover 3 away from the air source 2, and an external thread is provided on the outer wall of the end of the rotating shaft 9 close to the mover 3. The rotating shaft 9 is threadedly connected to the mover 3. The threaded connection has the advantages of stable and detachable connection, which makes the disassembly and assembly of the rotating shaft 9 and the axial force loading device more convenient.

[0037] In this embodiment, the support frame 10 is provided with a mounting hole for accommodating the stator 1. The mounting hole is coaxially arranged with the rotating shaft 9. The stator 1 is bolted to the support frame 10, and the stability of the stator 1 during operation is ensured by the support frame 10. It is understood that the support frame 10 can be fixed directly to the ground or mounted at one end of the rotating shaft 9 via a frame.

[0038] In this embodiment, two axial force loading devices are provided, and the two axial force loading devices are respectively provided at both ends of the rotating shaft 9 and connected to the rotating shaft 9 through the mover 3. By clamping on both sides, the stability of the rotating shaft 9 during operation is further improved.

[0039] The present invention uses specific examples to illustrate the principles and implementation methods of the present invention. The above examples are only intended to help understand the method and core concept of the present invention. At the same time, those skilled in the art will find that the specific implementation methods and application scopes may vary based on the concept of the present invention. In summary, the contents of this specification should not be construed as limiting the present invention.

Claims

1. An axial force loading device, characterized in that: include: A stator (1), wherein the air inlet of the stator (1) is used to be connected to an air source (2); and a mover (3), the mover (3) being coaxially connected to the rotating shaft (9), the mover (3) being coaxially arranged in the exhaust passage (4) of the stator (1), and the outer wall of the mover (3) being spaced apart from the inner wall of the exhaust passage (4).

2. The axial force loading device according to claim 1, characterized in that: The invention also includes a labyrinth seal assembly, wherein the labyrinth seal assembly includes a first grate tooth (5) and a second grate tooth (6) that cooperate with each other, wherein the first grate tooth (5) is mounted on the inner wall of the stator (1), and the second grate tooth (6) is mounted on the outer wall of the mover (3), and the first grate tooth (5) and the second grate tooth (6) are clearance-matched.

3. The axial force loading device according to claim 2, characterized in that: The stator (1) comprises a first part and a second part symmetrically arranged along an axial cross-section of the exhaust passage (4), and the first part and the second part are detachably connected.

4. The axial force loading device according to claim 2, characterized in that: The interior of the mover (3) is hollow, and the end of the mover (3) away from the rotating shaft (9) is an air intake end, and the air intake end is connected to the exhaust channel (4).

5. The axial force loading device according to claim 1, characterized in that: It also includes a pressure sensor (7), wherein a sensing end of the pressure sensor (7) is in air pressure communication with the exhaust passage (4).

6. The axial force loading device according to claim 5, characterized in that: A flow control valve is provided between the air inlet and the air source (2).

7. The axial force loading device according to claim 1, characterized in that: It also includes a connecting piece (8), the inlet end of the connecting piece (8) is threadedly connected to the outlet end of the gas source (2), and the outlet end of the connecting piece (8) is threadedly connected to the gas inlet.

8. A rotating device with adjustable axial force, characterized in that: include: The axial force loading device according to any one of claims 1 to 7; A rotating shaft (9), the rotating shaft (9) being connected to an end of the mover (3) away from the air source (2); and a support frame (10), wherein the support frame (10) is arranged at one axial end of the rotating shaft (9), and the stator (1) is fixedly mounted on the support frame (10).

9. The rotating device with adjustable axial force according to claim 8, characterized in that: A threaded hole is provided at one end of the mover (3) away from the air source (2), and the rotating shaft (9) is threadedly connected to the mover (3).

10. The rotating device with adjustable axial force according to claim 8, characterized in that: The support frame (10) is provided with a mounting hole for accommodating the stator (1), and the stator (1) is bolted to the support frame (10).

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