Dry gas seal ring displacement excitation structure and dynamic response testing device
By designing an excitation and dynamic response testing device for dry air seal, the problem of difficulty in accurately simulating the excitation state of key basic parts of rotating equipment in the prior art is solved, and the precise excitation and dynamic response testing of dry air seal is realized, and the experimental support capability of dynamic characteristics research is improved.
Patent Information
- Application Number
- CN202411804762.7
- Authority / Receiving Office
- CN · China
- Patent Type
- Applications(China)
- Current Assignee / Owner
- Filing Date
- 2024-12-10
- Publication Date
- 2025-02-28
AI Technical Summary
The prior art is difficult to accurately simulate the key basic parts of rotating equipment, especially dry air seals, and the rotation shaft excitation state is subjected to, resulting in a lack of experimental support for dynamic characteristics research and the inability to accurately evaluate dynamic performance.
A dry air-sealed ring displacement excitation structure and dynamic response testing device are designed, including a power transmission assembly, a displacement drive hoist assembly, an excitation seal ring assembly, a response seal ring assembly and a mounting body. The motor drives the curved surface ring to drive the hoist movement, combined with the suction force provided by the magnet, accurately simulate the excitation source, and monitor the excitation and response conditions through the displacement sensor.
Accurate excitation and dynamic response testing for dry air seals is realized, which can simulate disturbances under actual operating conditions, provide accurate excitation sources and response monitoring, and improve the experimental support capabilities of dynamic characteristics research.
Smart Images
Figure CN119533909A_ABST
Abstract
Description
Technical Field
[0001] The invention belongs to the technical field of dry gas sealing performance testing, and in particular relates to a dry gas sealing ring displacement excitation structure and a dynamic response testing device. Background Art
[0002] Rotating machinery systems have complex dynamic characteristics, and the shaft system is prone to instability during operation. This instability phenomenon greatly affects the operational stability of rotating machinery. For example, when running at high speed, the gas bearing-rotor system faces a variety of nonlinear excitation sources, resulting in many nonlinear vibration problems in the system, which significantly affects the dynamic characteristics and stability of the gas bearing-rotor system. Dry gas seals are widely used in shaft end seals of various rotating equipment due to their good sealing performance, but dry gas seals are often affected by various external disturbances, such as axial movement or angular deflection of the shaft, and vibration of the solid casing. Among these disturbances, the influence of shaft vibration is the most significant. If the dry gas seal cannot adapt well to external vibrations, it is easy to cause failures such as excessive wear of the end face or excessive leakage of the medium. At present, due to the limitations of test equipment, the dynamic characteristics of key basic parts such as dry gas seals and air bearings are mainly studied by theoretical analysis methods, while experimental research is relatively rare. The reason is that it is impossible to quantitatively and accurately construct the shaft excitation state of the seal or bearing. By simulating dynamic excitation in a real environment, dynamic experiments can help researchers understand the behavior and response of the system under different conditions and reveal the dynamic characteristics and potential problems of the system. In addition, dynamic experiments are essential to verify the accuracy of dynamic characteristics numerical simulation models and improve prediction accuracy. Therefore, it is very necessary to accurately simulate the excitation force and displacement of key basic parts of rotating equipment (especially dry gas seals) in the laboratory.
[0003] At present, in the study of dynamic characteristics, there are external devices for simulating specific excitations. Usually, a sinusoidal dynamic force is applied to the measured part through an electromagnetic exciter and an excitation rod, or a variable load is manually applied using a screw micrometer, or a pressure regulating chamber is added to the back of the measured part, and a pressurized gas is introduced into the pressure regulating chamber to apply an axial force during the test. However, under actual working conditions, disturbances are usually unpredictable. The manual variable load method cannot accurately simulate the actual working conditions and cannot be controlled; and the exciter is often expensive and has a fixed frequency. It can only provide excitation at a certain point, and it is difficult to achieve simultaneous excitation at multiple locations. In addition, electronic components are expensive and easily damaged during disassembly, which increases the cost of the experiment. Some workers also use a method with a corrugated ring to provide excitation, but this method only provides an upward force and does not consider whether the components can accurately follow the excitation, resulting in the actual excitation being much smaller than the given excitation. At the same time, the size of the driving component is fixed and the excitation force is limited. In addition to an accurate excitation source, accurate monitoring of the response of the responding component is crucial to evaluating its dynamic performance. Therefore, it is necessary to develop a compact and simple dry gas sealing ring excitation and dynamic response test device with precise and controllable excitation. Summary of the invention
[0004] In view of the above problems existing in the prior art, an object of the present invention is to provide a dry gas seal excitation and dynamic response test device with compact structure, precise and controllable excitation and measurable response characteristics.
[0005] The present invention provides the following technical solutions: a dry gas sealing ring displacement excitation structure and dynamic response test device, comprising a power transmission assembly, a displacement driving push rod assembly, an excitation sealing ring assembly, a response sealing ring assembly and a mounting seat body; the excitation sealing ring assembly and the response sealing ring assembly are arranged correspondingly, and both can be axially movably arranged on the mounting seat body; the power transmission assembly drives the displacement driving push rod assembly to rotate, thereby driving the excitation sealing ring assembly to move axially, so that the response sealing ring assembly moves accordingly; the excitation sealing ring assembly and the response sealing ring assembly are respectively provided with a first displacement sensor for monitoring the axial movement of the excitation sealing ring in the excitation sealing ring assembly, and a second displacement sensor for monitoring the change of the micrometer-level gap between the excitation sealing ring and the response sealing ring in the response sealing ring assembly.
[0006] Furthermore, the displacement drive push rod assembly includes a curved ring, a group of drive push rods, and a push rod limit seat; the curved ring is transmission-connected to the output end of the power transmission assembly, and a corrugated surface is provided on its upper end surface; the push rod limit seat is arranged above the curved ring, and a group of drive push rods can be axially moved and penetrated on the push rod limit seat, and the lower end of each drive push rod is provided with a curved surface structure that contacts the corrugated surface on the curved ring; the power transmission assembly drives the curved ring to rotate, so that different positions on the corrugated surface of the curved ring contact with a group of drive push rods, thereby driving a group of drive push rods to move axially.
[0007] Furthermore, the mounting seat body includes a response sealing ring seat, a sealing cavity and an excitation sealing ring seat which are arranged in sequence from top to bottom. The excitation sealing ring seat is fixedly mounted above the displacement drive push rod assembly, the sealing cavity is fixed on the excitation sealing ring seat, and the response sealing ring seat is inserted into the sealing cavity and fixedly connected to the sealing cavity.
[0008] Furthermore, the excitation sealing ring assembly also includes an upper magnet and a lower magnet arranged corresponding to the upper magnet, the excitation sealing ring is arranged on the excitation sealing ring seat, and an air cushion chamber with adjustable pressure is provided between the excitation sealing ring and the excitation sealing ring seat, and the upper end surface of each driving push rod is in contact with the lower end surface of the excitation sealing ring; the upper magnet is fixedly arranged at the lower part of the excitation sealing ring, and the lower magnet is fixedly arranged at the upper part of the push rod limit seat.
[0009] Furthermore, the response sealing ring is arranged on the response sealing ring seat, and a back pressure chamber with adjustable pressure is provided between the response sealing ring and the response sealing ring seat, and an elastic element for maintaining the floating property of the response sealing ring is provided in the back pressure chamber; a layer of fluid film is provided between the lower end surface of the response sealing ring seat and the excitation sealing ring.
[0010] Furthermore, the response sealing ring is a static pressure type sealing ring or a dynamic pressure type sealing ring; when the response sealing ring is a static pressure type sealing ring, its end face is provided with circumferentially evenly distributed throttling holes; when the response sealing ring is a dynamic pressure type sealing ring, its end face is provided with circumferentially evenly distributed dynamic pressure grooves.
[0011] Furthermore, the first displacement sensor is mounted on the excitation sealing ring seat, and the probe of the first displacement sensor is aligned with the second lower surface of the excitation sealing ring to monitor the axial displacement of the excitation sealing ring.
[0012] Furthermore, an embedded sensor seat is provided at the bottom of the response sealing ring seat, the second displacement sensor is fixedly mounted on the embedded sensor seat, and the probe of the second displacement sensor is aligned with the upper surface of the excitation sealing ring.
[0013] By adopting the above technology, compared with the prior art, the beneficial effects of the present invention are as follows:
[0014] 1) The present invention drives the movement structure of the ejector rod upward by driving the curved ring to rotate through a motor, and uses magnets to provide downward suction to ensure that the excited component can closely follow the excitation source, and can provide an accurate excitation source to simulate the disturbances received by the dry gas seal during actual operation;
[0015] 2) The present invention can conveniently and accurately test the actual excitation displacement value and the dynamic response of the response component by arranging displacement sensors at multiple positions along the circumference to monitor the displacement values of the excitation component and the response component;
[0016] 3) The active mechanism and the driven mechanism of the present invention are designed separately, and the overall structure is compact. At the same time, different driving forces and driving frequencies can be provided by replacing motors with different powers and speeds. The amplitude and frequency of the excitation can be adjusted by changing the surface slide waviness amplitude and wave number of the curved ring. BRIEF DESCRIPTION OF THE DRAWINGS
[0017] Figure 1 It is a schematic diagram of the overall structure of the seal displacement excitation structure and the dynamic response test platform in the implementation case of the present invention;
[0018] Figure 2 It is a structural schematic diagram of the components of the seal displacement excitation structure and the dynamic response test platform in the implementation case of the present invention;
[0019] Figure 3 It is a cross-sectional structural schematic diagram of a seal displacement excitation structure and a dynamic response test platform in an implementation case of the present invention;
[0020] Figure 4 It is a schematic diagram of a three-dimensional explosion structure of an excitation sealing ring assembly in an implementation case of the present invention;
[0021] Figure 5 It is a cross-sectional schematic diagram of a three-dimensional structure of an excitation displacement and response test in an implementation case of the present invention;
[0022] Figure 6 It is a structural schematic diagram of a power transmission assembly in an implementation case of the present invention;
[0023] Figure 7 It is a force analysis diagram of the excitation ring in the implementation case of the present invention;
[0024] Figure 8 is a schematic diagram of a curve between the displacement of the excitation ring and the suction force / friction force in an implementation case of the present invention;
[0025] Fig. 9 It is a schematic diagram of the three-dimensional structure of the dynamic pressure static ring specimen in the implementation case of the present invention;
[0026] Fig.10 It is a schematic diagram of the three-dimensional structure of the static pressure static ring specimen in the implementation case of the present invention;
[0027] Fig.11 It is a cross-sectional view of a static pressure type dry gas seal response test device in an implementation case of the present invention. DETAILED DESCRIPTION
[0028] In order to make the purpose, technical solution and advantages of the present invention more clearly understood, the present invention is further described in detail below in conjunction with the accompanying drawings and embodiments of the specification. It should be understood that the specific embodiments described herein are only used to explain the present invention and are not used to limit the present invention.
[0029] On the contrary, the present invention covers any substitution, modification, equivalent method and scheme made on the essence and scope of the present invention as defined by the claims. Further, in order to make the public have a better understanding of the present invention, some specific details are described in detail in the detailed description of the present invention below. Those skilled in the art can fully understand the present invention without the description of these details.
[0030] Reference Figure 1-9 A dry gas sealing ring displacement excitation structure and dynamic response test device includes a base plate, a power transmission assembly 1, a displacement drive push rod assembly 2, an excitation sealing ring assembly 3, a response sealing ring assembly 4 and a mounting seat body 5.
[0031] Specifically, the power transmission assembly 1 includes a driving motor 11, a driving pulley 12, a transmission belt 13, a driven pulley 14, and a driven shaft 15; the driving pulley 12 is connected to the output end of the driving motor 11, and is connected to the driven pulley 14 through the transmission belt 13; a bearing seat is fixed to the bottom plate, and the driven shaft 15 is rotatably arranged on the bearing seat through a bearing, and the driven pulley 14 is arranged on the outside of the driven shaft 15 and is connected to the driven shaft 15; the driving pulley 12 rotates synchronously with the driving motor 11, and the driven pulley 14 rotates synchronously with the driven shaft 15.
[0032] Specifically, the displacement drive push rod assembly includes a drive push rod 21, a curved ring 22, and a push rod stop seat 23. The power transmission assembly 1 drives the curved ring 22 to rotate, and multiple drive push rods 21 are arranged circumferentially. Each drive push rod 21 passes through the push rod stop seat 23 and can move vertically. The lower end of each drive push rod 21 contacts the upper surface 221 of the curved ring 22, and the upper end of the drive push rod 21 contacts the first lower surface 311 of the excitation sealing ring 31 in the excitation sealing ring assembly 3. The curved ring 22 is key-connected to the driven shaft 15 and rotates therewith. The rotation speed of the curved ring 22 can be changed by changing the rotation speed of the drive motor 11 or the transmission ratio of the driven pulley 14 to the driving pulley 12.
[0033] Specifically, the mounting seat body 5 includes a response sealing ring seat 51, a sealing cavity 52, and an excitation sealing ring seat 53 which are sequentially installed and fastened from top to bottom. The excitation sealing ring seat 53 is fixedly arranged on the bottom plate through a bracket and is located above the displacement drive push rod assembly 2. The sealing cavity 52 is fixed on the excitation sealing ring seat 53. The response sealing ring seat 51 is inserted into the sealing cavity 52 and fixedly connected to the sealing cavity 52.
[0034] Specifically, the excitation sealing ring assembly 3 includes an excitation sealing ring 31, an upper magnet 32, a lower magnet 33 and a first displacement sensor 34. A through groove is provided in the excitation sealing ring seat 53, and the excitation sealing ring 31 is placed in the through groove; the upper magnet 32 is fixedly installed at the lower part of the excitation sealing ring 31, and the lower magnet 33 is fixed at the center of the top rod limit seat 23. There is an attraction between the upper magnet 32 and the lower magnet 33, and the axial attraction F1 between the lower magnet 33 and the upper magnet 32 can be adjusted by changing the axial gap between the two. In order to construct an adjustable pressure air cushion cavity 531 at the axial position of the excitation sealing ring 31, a first auxiliary sealing ring 532 and a second auxiliary sealing ring 533 are provided between the excitation sealing ring 31 and the excitation sealing ring seat 53 in the radial direction. The first displacement sensor 34 is installed on the excitation sealing ring seat 53, and the upper part of the probe of the first displacement sensor 34 is aligned with the second lower surface 312 of the excitation sealing ring 31 to monitor the axial displacement of the excitation sealing ring 31.
[0035] Specifically, the response sealing ring assembly 4 includes a response sealing ring 41 , an elastic element 42 , an embedded sensor seat 43 and a second displacement sensor 44 .
[0036] The lower part of the response seal ring seat 51 is provided with a sink groove, and the response seal ring 41 is placed in the sink groove; the response seal ring 41 and the excitation seal ring 31 form a pair of seal pairs, and a layer of fluid film is provided between the response seal ring end face 411 and the excitation seal ring end face 314 to achieve non-contact, wherein the response seal ring end face 411 is provided with a micron-level shallow groove 413, and the dynamic pressure type seal ring. An elastic element 42 is provided between the response seal ring 41 and the response seal ring seat 51 in the axial direction to maintain the floating property of the response seal ring 41; the embedded sensor seat 43 is fixedly installed on the inner diameter side of the response seal ring 41, and the second displacement sensor 44 is fixedly installed on the embedded sensor seat 43, and the lower part of the probe of the second displacement sensor 44 is aligned with the upper surface 313 of the excitation seal ring 31 to monitor the micron-level gap change between the upper surface 313 of the excitation seal ring and the lower surface 411 of the response seal ring. A back pressure cavity 511 with adjustable pressure is axially arranged between the response sealing ring 41 and the response sealing ring seat 51 , and an outer sealing cavity 521 with adjustable pressure is radially arranged between the sealing cavity body 52 and the response sealing ring 41 .
[0037] Reference Figure 5 and 6 The upper outer side of the excitation sealing ring 31 is subjected to the gas pressure force F from the outer sealing chamber 521. c The place where the excitation seal ring 31 and the response seal ring 41 are opposite to each other is subjected to the air film bearing force Fo in the sealing gap. The friction forces of the first auxiliary seal ring 532 and the second auxiliary seal ring 533 on the outer diameter side of the excitation seal ring 31 are Ff1 and Ff2 respectively. The auxiliary seal ring friction force F2 = F f1 +F f2The first lower surface 311 of the excitation sealing ring 31 is subjected to the axial force F2 from the top rod, and the second lower surface 312 is subjected to the air pressure force Fs from the air cushion chamber 531. At the same time, the lower part of the excitation sealing ring 31 is also subjected to the axial suction force F1 between the lower magnet 33 and the upper magnet 32. s =F o +F c The existence of the auxiliary sealing ring hinders the excitation ring from moving downward, so the axial suction force F1 must be no less than the auxiliary sealing ring friction force F2 that the excitation sealing ring 31 is subjected to when moving downward.
[0038] A pair of seal pairs consisting of an excitation seal ring 31 and a response ring 41, the seal gap h0 at the center of the seal ring is measured by a second displacement sensor 44 fixed on a sensor seat 43 embedded in the response ring 41, and the axial excitation displacement h1 of the excitation seal ring is measured by a first displacement sensor 34 installed on the excitation seal ring seat 53. By comparing the changes of the values h0 and h1 over time, the actual excitation displacement value and the response value can be determined.
[0039] Implementation Case 2
[0040] Reference Fig.10 and 11 The difference between this embodiment and the first embodiment is that the response sealing ring 41 is a static pressure type sealing ring, and the end surface 412 of the response sealing ring is provided with circumferentially uniformly distributed throttle holes 414 and pressure equalizing grooves 415, and the middle part 416 of the response sealing ring is provided with circumferentially uniformly distributed vent holes 417, and the throttle holes 414 are connected with the vent holes 417 in a one-to-one correspondence. An annular vent groove 418 is provided in the middle of the outer diameter side of the response ring 41, and uniformly distributed air holes 419 are provided on the groove, and the air holes 419 are connected with the vent holes 417. In order to construct a closed throttle air cavity 420 in the middle of the response sealing ring 41, a third auxiliary sealing ring 522 and a fourth auxiliary sealing ring 523 are provided on the inner diameter side of the response ring seat, and the throttle air cavity 420 is connected with the external gas pipeline through the through holes on the response sealing ring seat 51 and the sealing cavity body 52. The rest of the structure is the same as that in the first embodiment.
[0041] The contents described in the embodiments of this specification are merely an enumeration of implementation forms of the inventive concept. The protection scope of the present invention should not be deemed to be limited to the specific forms described in the embodiments. The protection scope of the present invention also extends to equivalent technical means that can be conceived by those skilled in the art based on the inventive concept.
Claims
1. A dry gas seal ring displacement excitation structure and dynamic response test device, characterized in that: The invention comprises a power transmission component (1), a displacement driving push rod component (2), an excitation sealing ring component (3), a response sealing ring component (4) and a mounting seat body (5); the excitation sealing ring component (3) and the response sealing ring component (4) are arranged correspondingly, and both are axially movable on the mounting seat body (5); the power transmission component (1) drives the displacement driving push rod component (2) to rotate, thereby driving the excitation sealing ring component (3) to move axially, so that the response sealing ring component (4) moves accordingly; the excitation sealing ring component (3) and the response sealing ring component (4) are respectively provided with a first displacement sensor (34) for monitoring the axial movement of an excitation sealing ring (31) in the excitation sealing ring component (3), and a second displacement sensor (44) for monitoring the micrometer-level gap change between the excitation sealing ring (31) and the response sealing ring (41) in the response sealing ring component (4).
2. A dry gas seal ring displacement excitation structure and dynamic response test device according to claim 1, characterized in that: The displacement driving push rod assembly (2) comprises a curved surface ring (22), a group of driving push rods (21), and a push rod limiting seat (23); the curved surface ring (22) is drivingly connected to the output end of the power transmission assembly (1), and a corrugated surface is provided on the upper end surface of the curved surface ring (22); the push rod limiting seat (23) is arranged above the curved surface ring (22), a group of driving push rods (21) can be axially moved and penetrated on the push rod limiting seat (23), and the lower end of each driving push rod (21) is provided with a curved surface structure that contacts the corrugated surface on the curved surface ring (22); the power transmission assembly (1) drives the curved surface ring (22) to rotate, so that different positions on the corrugated surface of the curved surface ring (22) contact the group of driving push rods (21), thereby driving the group of driving push rods (21) to move axially.
3. A dry gas seal ring displacement excitation structure and dynamic response test device according to claim 2, characterized in that: The mounting seat body (5) comprises a response sealing ring seat (51), a sealing cavity (52) and an excitation sealing ring seat (53) which are arranged in sequence from top to bottom. The excitation sealing ring seat (53) is fixedly mounted above the displacement drive push rod assembly (2), the sealing cavity (52) is fixed on the excitation sealing ring seat (53), and the response sealing ring seat (51) is inserted into the sealing cavity (52) and fixedly connected to the sealing cavity (52).
4. A dry gas seal ring displacement excitation structure and dynamic response test device according to claim 3, characterized in that: The excitation sealing ring assembly (3) further comprises an upper magnet (32) and a lower magnet (33) arranged corresponding to the upper magnet (32); the excitation sealing ring (31) is arranged on an excitation sealing ring seat (53); an air cushion chamber (531) with adjustable pressure is arranged between the excitation sealing ring (31) and the excitation sealing ring seat (53); the upper end surface of each driving push rod (21) contacts the lower end surface of the excitation sealing ring (31); the upper magnet (32) is fixedly arranged at the lower part of the excitation sealing ring (31); and the lower magnet (33) is fixedly arranged at the upper part of the push rod limiting seat (23).
5. A dry gas seal ring displacement excitation structure and dynamic response test device according to claim 4, characterized in that: The response sealing ring (41) is arranged on the response sealing ring seat (51), and a back pressure chamber (511) with adjustable pressure is arranged between the response sealing ring (41) and the response sealing ring seat (51), and an elastic element (42) for maintaining the floating property of the response sealing ring (41) is arranged in the back pressure chamber (511); a layer of fluid film is arranged between the lower end surface of the response sealing ring seat (51) and the excitation sealing ring (31).
6. A dry gas seal ring displacement excitation structure and dynamic response test device according to claim 5, characterized in that: The response sealing ring (41) is a static pressure type sealing ring or a dynamic pressure type sealing ring; when the response sealing ring (41) is a static pressure type sealing ring, its end surface is provided with throttle holes evenly distributed in the circumferential direction; when the response sealing ring (41) is a dynamic pressure type sealing ring, its end surface is provided with dynamic pressure grooves evenly distributed in the circumferential direction.
7. A dry gas seal ring displacement excitation structure and dynamic response test device according to claim 4, characterized in that: The first displacement sensor (34) is mounted on the excitation sealing ring seat (53), and the probe of the first displacement sensor (34) is aligned with the second lower surface (312) of the excitation sealing ring (31) to monitor the axial displacement of the excitation sealing ring (31).
8. A dry gas seal ring displacement excitation structure and dynamic response test device according to claim 4, characterized in that: An embedded sensor seat (43) is provided at the bottom of the response sealing ring seat (51), the second displacement sensor (44) is fixedly mounted on the embedded sensor seat (43), and the probe of the second displacement sensor (44) is aligned with the upper surface (313) of the excitation sealing ring (31).