Combined shock absorber for compressor based on small hole overflowing theory

Abstract

The invention belongs to the field of compressor equipment, and discloses a combined shock absorber for a compressor based on a small hole overflowing theory, which comprises a compressor body and a device body, the device body comprises a steel wire rope vibration isolator assembly and a small hole overflowing damper assembly. A novel vibration suppression structure is developed, and active damping and structural optimization design are combined. A self-developed steel wire rope vibration isolator and a novel small-hole overflowing damper are combined, the steel wire rope vibration isolator is used for absorbing high-frequency vibration energy, the small-hole overflowing damper is used for absorbing low-frequency vibration energy, and the high-frequency vibration energy and the low-frequency vibration energy can be absorbed to the maximum extent through the synergistic effect generated by combination of the steel wire rope vibration isolator and the small-hole overflowing damper. While the operation efficiency of the compressor is ensured, the vibration amplitude is remarkably reduced, and the system reliability is improved, so that the requirement of modern industry for long-period stable operation of equipment is met.

Description

Technical Field

[0001] The invention belongs to the technical field of compressor equipment, and in particular relates to a combined vibration damper for a compressor based on a small hole flow theory. Background Art

[0002] As the core power equipment in the industrial field, compressors are widely used in refrigeration systems, air compression, petrochemicals, energy transportation and other fields. However, during operation, the compressor will inevitably produce vibration problems due to internal mechanical movement (such as piston reciprocation, rotor rotation, etc.) and fluid dynamics. Long-term vibration will not only cause fatigue damage to key components of the equipment (such as bearings, seals, connecting bolts, etc.), shorten the service life of the equipment, but may also cause noise pollution, increased energy consumption and decreased system stability. Especially under high speed, high power or variable operating conditions, the vibration amplitude is easy to exceed the safety threshold, and even cause resonance, threatening the safe operation of the equipment.

[0003] Traditional vibration reduction measures mostly adopt passive design, such as adding damping materials, optimizing structural stiffness or installing basic vibration pads, but these methods are poorly adaptable to complex working conditions and it is difficult to take into account both lightweight and efficient vibration reduction requirements. In recent years, as compressors have developed towards high efficiency and compactness, their internal space limitations have put forward higher requirements for vibration reduction technology.

[0004] In view of the above analysis, the technical problems that need to be solved urgently in the prior art are:

[0005] Existing conventional means cannot effectively take into account both lightweight and efficient vibration reduction. It is urgent to develop a new vibration suppression technology that can combine active vibration reduction with structural optimization design to significantly reduce the vibration amplitude and improve system reliability while ensuring the operating efficiency of the compressor, so as to meet the needs of modern industry for long-term stable operation of equipment. Summary of the invention

[0006] In view of the problems existing in the prior art, the present invention provides a combined vibration damper for a compressor based on the small hole flow theory.

[0007] The present invention is implemented as follows: a combined vibration damper for a compressor based on the small hole flow theory, characterized in that it includes a compressor body, an inventive device body;

[0008] The main body of the invention device includes a wire rope vibration isolator assembly and a small hole flow damper assembly;

[0009] The wire rope vibration isolator assembly comprises a first bolt, a first vibration isolation mounting block, a first wire damping rope, a second wire damping, a third wire damping, a fourth wire damping rope, a first limiting ring, a second limiting ring, a second vibration isolation mounting block, and a first nut;

[0010] The small hole flow damper assembly includes a first damping spring, a second damping spring, a third damping spring, a fourth damping spring, a damping chamber, a first fixing bolt, a second fixing bolt, a first fixing nut, a second fixing nut, a movable slide rod, a first damping hole, and a second damping hole.

[0011] Furthermore, the first nut passes through the first vibration isolation mounting block and is tightly fitted with the first nut.

[0012] Furthermore, the first steel wire damping rope, the second steel wire damping rope, the third steel wire damping rope, and the fourth steel wire damping rope are evenly distributed in space in a symmetrical manner, one end of which is connected to the first vibration isolation mounting block, and the other end of which is connected to the second vibration isolation mounting block.

[0013] Furthermore, the first limiting ring and the second limiting ring are spatially symmetrical, one end of the first limiting ring is connected to the first vibration isolation mounting block, and the other end of the second limiting ring is connected to the second vibration isolation mounting block.

[0014] Furthermore, the first damping spring, the second damping spring, the third damping spring, and the fourth damping spring are evenly and symmetrically distributed in space.

[0015] Furthermore, the first fixing bolt and the second fixing bolt are symmetrically distributed on both sides of the damping.

[0016] Furthermore, the movable sliding rod passes through the damping cavity and is located in the middle.

[0017] Furthermore, the inner surface of the damping cavity is nickel-based alloy + solid lubricant (MoS 2 / WS 2 ) treatment, electroplating or laser cladding process, the lubricant content is controlled at 3-5wt%.

[0018] In combination with the above technical solutions and the technical problems solved, the advantages and positive effects of the technical solutions to be protected by the present invention are as follows:

[0019] First, the device of the present invention has a compact structure, without complex and easily damaged parts, and the overall structure can be mass-produced; the wire rope isolator absorbs high-frequency vibration energy, and the small-hole flow damper absorbs low-frequency vibration energy. The synergistic effect produced by the combination of the two can maximize the absorption of high and low-frequency vibration energy; the structure of the present invention does not have too many moving parts, which can reduce mechanical wear and achieve long life and low maintenance costs.

[0020] Second, it reduces redundant components of the combined device, makes the structure more compact, and reduces the inspection cost of the product throughout its life cycle. The relevant technical solutions in the patent of this invention can be used as a reference for high value-added markets, such as wind power, precision manufacturing, national defense and military industries, and can cooperate with wire rope material suppliers (such as Xintian Steel and other companies) and fluid damping medium research and development institutions to promote upstream material upgrades, while driving downstream application ecosystems such as building seismic isolation and industrial equipment vibration reduction, generating industrial chain synergy effects.

[0021] Traditional vibration isolation devices often have difficulty taking into account both high-frequency and low-frequency vibrations. Wire rope vibration isolators absorb high-frequency energy through friction and slip between steel wires, while small-hole flow dampers suppress low-frequency vibrations through fluid viscous resistance. The combination of the two realizes the coordinated dissipation of broadband vibration energy for the first time, covering the spectrum range that traditional single components cannot cross, and realizing full-band vibration control.

[0022] The wire rope isolator has nonlinear hysteresis characteristics and dry friction damping, while the small hole damper is a linear damping element. By coupling two different mechanical properties, this structure breaks through the limitations of a single material or structure in dynamic response matching and solves the contradiction between the stability and energy dissipation efficiency of the vibration isolation system under complex working conditions.

[0023] Breaking the limitation of applicable frequency band of a single component, this structure systematically breaks the industry technical prejudices such as "frequency band splitting" and "component mutual exclusion" through innovations such as winding belt constraint and fluid damping coupling, providing an example of interdisciplinary integration in the field of vibration control. BRIEF DESCRIPTION OF THE DRAWINGS

[0024] Figure 1 It is a front view of the installation of the invention device provided by an embodiment of the present invention;

[0025] Figure 2 is a front view of the device structure provided by an embodiment of the present invention;

[0026] Figure 3 is a schematic diagram of the structure of a device provided by an embodiment of the present invention;

[0027] Figure 4 is a cross-sectional view of a device provided by an embodiment of the present invention;

[0028] Figure 5 This is a real scene diagram of the device test provided by the embodiment of the present invention;

[0029] Figure 6 It is a comparison of the amplitude and frequency experimental data before and after the installation of the device provided by the embodiment of the present invention;

[0030] In the figure: 1, compressor body; 2, inventive device body; 21, wire rope vibration isolator assembly; 22, small hole flow damper assembly; 211, first bolt; 212, first vibration isolation mounting block; 213A, first wire damping rope; 213B, second wire damping rope; 213C, third wire damping rope; 213D, fourth wire damping rope; 214A, first limiting ring; 214B, second limiting ring; 215, second vibration isolation mounting block Block; 216, first nut; 221A, first damping spring; 221B, second damping spring; 221C, third damping spring; 221D, fourth damping spring; 222, damping chamber; 223A, first fixing bolt; 223B, second fixing bolt; 224A, first fixing nut; 224B, second fixing nut; 225, movable slide rod; 225-1A, first damping hole; 225-1B, second damping hole. DETAILED DESCRIPTION

[0031] 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 embodiments. 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.

[0032] like Figure 1-Figure 4 As shown, the embodiment of the present invention provides a combined vibration damper for a compressor based on the small hole flow theory, comprising a compressor body 1 and an invention device body 2; the invention device body 2 comprises a wire rope vibration isolator assembly 21 and a small hole flow damper assembly 22;

[0033] The wire rope vibration isolator assembly 21 includes a first bolt 211, a first vibration isolation mounting block 212, a first wire damping rope 213A, a second wire damping rope 213B, a third wire damping rope 213C, a fourth wire damping rope 213D, a first limiting ring 214A, a second limiting ring 214B, a second vibration isolation mounting block 215, and a first nut 216.

[0034] The first bolt 211 passes through the first vibration isolation mounting block 212 and is tightly fitted with the first nut 216 .

[0035] The first steel wire damping rope 213A, the second steel wire damping rope 213B, the third steel wire damping rope 213C, and the fourth steel wire damping rope 213D are evenly distributed in space symmetrically, one end of which is connected to the first vibration isolation mounting block 212 , and the other end of which is connected to the second vibration isolation mounting block 215 .

[0036] The first limiting ring 214A and the second limiting ring 214B are spatially symmetrical, one end of which is connected to the first vibration isolation mounting block 212 , and the other end of which is connected to the second vibration isolation mounting block 215 .

[0037] The small hole flow damper assembly 22 includes a first damping spring 221A, a second damping spring 221B, a third damping spring 221C, a fourth damping spring 221D, a damping chamber 222, a first fixing bolt 223A, a second fixing bolt 223B, a first fixing nut 224A, a second fixing nut 224B, a movable slide rod 225, a first damping hole 225-1A, and a second damping hole 225-1B.

[0038] The first damping spring 221A, the second damping spring 221B, the third damping spring 221C, and the fourth damping spring 221D are evenly and symmetrically distributed in space;

[0039] The first fixing bolt 223A and the second fixing bolt 223B are symmetrically distributed on both sides of the damping chamber 222;

[0040] The movable sliding rod 225 passes through the damping chamber 222 and is located in the middle.

[0041] The inner surface of the damping cavity is nickel-based alloy + solid lubricant (MoS 2 / WS 2 ) treatment, electroplating or laser cladding process, the lubricant content is controlled at 3-5wt%.

[0042] The combined vibration damper of the present invention is installed on the compressor as a whole, and plays a role of vibration isolation and damping. The vibration damper device body includes two major sub-assemblies: a wire rope vibration isolator assembly and a small hole flow damper assembly. The two sub-assemblies work together through structure and assembly relationship. The former is responsible for isolating vibration transmission, and the latter is responsible for dissipating vibration energy. Through this combination, the vibration generated by the compressor during operation can be effectively reduced in multiple links, thereby reducing noise and extending the life of the equipment.

[0043] The wire rope vibration isolator assembly is fixed to the first vibration isolation mounting block 212 by the first bolt 211 and is tightened and fixed with the first nut 216 to form a fixed base. Multiple wire damping ropes (the first to fourth wire damping ropes 213A-213D) and limiting rings (the first limiting ring 214A, the second limiting ring 214B) are symmetrically and evenly arranged in space, respectively connecting the first vibration isolation mounting block 212 and the second vibration isolation mounting block 215. This structure uses the flexible connection of the wire damping rope and the physical limitation of the limiting ring to effectively absorb and disperse the vibration during the transmission process, while ensuring the relative position stability of the vibration isolation module during operation.

[0044] The orifice flow damper assembly includes symmetrically evenly distributed first to fourth damping springs 221A-221D, a damping chamber 222, and a movable slide bar 225 located in the middle of the damping chamber. The first fixing bolt 223A and the second fixing bolt 223B are respectively fixed to the two sides of the damping chamber, and are combined with the corresponding fixing nuts 224A and 224B to firmly fix the damping chamber. The movable slide bar 225 passes through the damping chamber, and is provided with a first damping hole 225-1A and a second damping hole 225-1B, which plays a role in regulating the damping effect generated when the fluid passes through the orifice, thereby effectively dissipating the vibration energy transmitted to the compressor body.

[0045] In order to ensure the stable operation of the small hole flow damper assembly, the inner surface of the damping cavity is treated with a nickel-based alloy and solid lubricant (MoS 2 / WS 2 ) treatment, which can be done by electroplating or laser cladding, and the lubricant content is strictly controlled at 5-15wt%. This surface treatment reduces the friction coefficient when the moving slide rod slides in the damping cavity, making the operation more stable and extending the service life of the components. Overall, the close coordination of the wire rope vibration isolator assembly and the small hole flow damper assembly in structure and assembly achieves effective isolation and damping of the compressor vibration, thereby ensuring that the compressor operates in an efficient and stable state.

[0046] The wire rope vibration isolator assembly 21 of the present invention is composed of a first bolt 211, a first vibration isolation mounting block 212, a second vibration isolation mounting block 215 and four steel wire damping ropes 213A-213D, forming a rigid-flexible vibration isolation structure. Among them, the first bolt 211 passes through the first vibration isolation mounting block 212 and is fixed by a first nut 216 to ensure a stable connection of the assembly. The four steel wire damping ropes 213A-213D are arranged in a spatially symmetrical and evenly distributed manner, with one end connected to the first vibration isolation mounting block 212 and the other end connected to the second vibration isolation mounting block 215, providing vibration isolation capabilities in both the vertical and horizontal directions.

[0047] When the compressor vibrates, the steel wire damping ropes 213A-213D undergo elastic deformation, absorbing and attenuating high-frequency vibration energy, while avoiding the impact transmission caused by the rigid connection. Since the steel wire ropes have a multi-strand structure and friction damping characteristics, they can effectively suppress resonance and improve vibration reduction performance.

[0048] The limiting structure of the present invention comprises a first limiting ring 214A and a second limiting ring 214B, which are arranged symmetrically in space, with one end fixed to the first vibration isolation mounting block 212 and the other end fixed to the second vibration isolation mounting block 215 .

[0049] During vibration, the steel wire damping ropes 213A-213D mainly play a flexible vibration isolation role, while the limit rings 214A and 214B provide rigid support when the displacement threshold is exceeded to prevent damage to the components due to excessive amplitude. When the amplitude reaches the set limit, the limit ring gradually contacts the damping structure to play a buffering role, thereby reducing the displacement impact and improving the overall reliability of the system.

[0050] The small hole flow damper assembly 22 of the present invention is composed of a damping chamber 222, a movable slide bar 225, and first and second damping holes 225-1A and 225-1B, and realizes effective damping control by combining the small hole flow principle. When the compressor vibrates, the movable slide bar 225 is displaced under the external excitation, driving the fluid in the damping chamber 222 to flow through the first damping hole 225-1A and the second damping hole 225-1B.

[0051] According to the small hole flow theory, when the liquid passes through the tiny hole, its flow is affected by the combined effects of shear force, inertia force and viscous resistance, which in turn produces a fluid damping effect. This effect can convert mechanical vibration energy into heat energy, thereby reducing the vibration amplitude of the compressor and improving the vibration reduction effect. The diameter of the damping hole and the viscosity of the fluid can be adjusted according to the actual application requirements to optimize the damping characteristics.

[0052] The orifice flow damper assembly 22 of the present invention further comprises a first damping spring 221A, a second damping spring 221B, a third damping spring 221C, and a fourth damping spring 221D, which are evenly distributed in a spatially symmetrical manner around the damping chamber 222. The function of these springs is to provide additional buffering force, prevent the system from rigid collision, and improve the overall buffering capacity.

[0053] During the operation of the compressor, if it is subjected to transient impact or continuous vibration, the spring assembly can share part of the load, so that the slide bar 225 responds slowly, thereby achieving a smoother vibration control effect. By optimizing the matching relationship between the spring stiffness and the damping coefficient, the resonant frequency of the system can be effectively reduced, ensuring that vibrations in different frequency ranges can be effectively suppressed.

[0054] The damping chamber 222 of the present invention is rigidly fixed by the first fixing bolt 223A and the second fixing bolt 223B, and is symmetrically arranged to improve structural stability. The fixing bolts not only provide structural support, but also ensure that the slide bar 225 always maintains a stable axial motion trajectory during vibration.

[0055] In addition, the first fixing bolt 223A and the second fixing bolt 223B are locked by the first fixing nut 224A and the second fixing nut 224B, so that the entire damper assembly can remain fastened and not loosened in a high-frequency vibration environment, thereby enhancing durability and reliability.

[0056] In order to improve the motion stability of the slide bar 225 in the damping chamber 222, the present invention adopts a nickel-based alloy and a solid lubricant MoS 2 / WS 2 Coating treatment: coating deposition is performed by electroplating or laser cladding process, and the lubricant content is controlled at 3-5wt%.

[0057] The lubricating coating has the following functions:

[0058] 1. Reduce the friction coefficient to ensure that the slide bar 225 moves smoothly and smoothly without being affected by the adhesion force of the damping cavity wall.

[0059] 2. Reduce wear and improve the durability of the system, so that the slide bar can still maintain efficient damping performance under long-term vibration.

[0060] 3. Enhanced corrosion resistance, it can still maintain stable lubrication effect in high humidity and high pressure environments, and is suitable for long-term use scenarios.

[0061] The present invention is based on a combined vibration reduction method of steel wire vibration isolation and small hole flow damping. The steel wire damping rope provides flexible vibration isolation, the small hole flow structure provides fluid damping, the spring structure enhances the buffering performance, the limit structure prevents excessive displacement, the fixing bolts provide structural stability, and the surface lubrication technology reduces wear and other multiple optimizations to form an efficient and stable compressor vibration reduction solution. The design can adapt to complex working conditions and can provide efficient and low-loss vibration reduction effects at different vibration frequencies, effectively extending the service life of the compressor and reducing the equipment operation noise.

[0062] The diameter of the first damping hole is d, and the inner diameter of the damping cavity is D 1 , the diameter of the moving slide is D 2 , moving slider speed v, flow coefficient C q =0.5~0.9, air density ρ=1.29kg / m 3 but

[0063]

[0064] The inertia force of the compressor is as follows, with standard amplitude x≤0.5mm, frequency ω≤10Hz, and compressor weight 8kg:

[0065] F 惯 =m·a=m·(-ω 2 x)≥400N

[0066] According to the relationship between the compressor inertia force and the damping force, the design parameter range of the damping hole is obtained:

[0067]

[0068] Where v = 0.1, D 1 and D 2 Affected by the structural size, n and d are dynamic variables, and the relationship is roughly as follows:

[0069]

[0070] The technical solutions mainly implemented by the embodiments of the present invention are as follows:

[0071] 1. When the compressor starts running, the vibration is transmitted to the first vibration isolation mounting block, and the wire rope undergoes nonlinear bending and deformation to absorb high-frequency mechanical shock;

[0072] 2. The vibration is transmitted to the second vibration isolation mounting block, forcing the vibration damping spring to bend and achieve vibration damping;

[0073] 3. The remaining unconsumed amplitude is transmitted to the small hole flow damper assembly. The movement of the damper sliding rod causes the volume change and pressure difference of the chambers on both sides of the damper, which will prompt the air to flow through the damping hole, the viscous energy dissipation effect, and attenuate the low-frequency vibration energy, thereby producing a damping effect.

[0074] The actual scene of the device test is as follows Figure 5 shown.

[0075] Comparison of amplitude and frequency experimental data before and after the device is installed Figure 6 shown.

[0076] Conventional scheme curve: In the initial stage, when the frequency is close to 0, the amplitude is about 7mm; as the frequency increases, the amplitude decreases rapidly, and when the frequency reaches about 50Hz, the amplitude drops to about 2mm; thereafter, as the frequency further increases, the rate of decrease slows down, and when the frequency reaches around 300Hz, the amplitude stabilizes at close to 1mm.

[0077] Combined shock absorber solution curve: When the frequency is near 0, the amplitude is about 5mm; as the frequency increases, the amplitude decreases significantly, and when the frequency reaches about 50Hz, the amplitude has dropped to close to 0mm; subsequently, as the frequency continues to increase from 50Hz to 300Hz, the amplitude always remains at a low level close to 0mm.

[0078] The above description is only a specific implementation mode of the present invention, but the protection scope of the present invention is not limited thereto. Any modifications, equivalent substitutions and improvements made by any technician familiar with the technical field within the technical scope disclosed by the present invention and within the spirit and principle of the present invention should be covered by the protection scope of the present invention.

Claims

1. A combined vibration damper for a compressor based on the small hole flow theory, characterized in that: include: The compressor body and the invented device body; The main body of the inventive device comprises a wire rope vibration isolator assembly and a small hole flow damper assembly; The wire rope vibration isolator assembly comprises a first bolt, a first vibration isolation mounting block, a first wire damping rope, a second wire damping rope, a third wire damping rope, a fourth wire damping rope, a first limiting ring, a second limiting ring, a second vibration isolation mounting block and a first nut; The small hole flow damper assembly includes a first damping spring, a second damping spring, a third damping spring, a fourth damping spring, a damping chamber, a first fixing bolt, a second fixing bolt, a first fixing nut, a second fixing nut, a movable slide rod, a first damping hole and a second damping hole.

2. The combined shock absorber according to claim 1, characterized in that: The first bolt passes through the first vibration isolation mounting block and is tightened and fixed with the first nut; The first steel wire damping rope, the second steel wire damping rope, the third steel wire damping rope and the fourth steel wire damping rope are symmetrically distributed in space, one end of which is connected to the first vibration isolation mounting block, and the other end of which is connected to the second vibration isolation mounting block; The first limiting ring and the second limiting ring are also symmetrical in space, one end of which is connected to the first vibration isolation mounting block, and the other end of which is connected to the second vibration isolation mounting block.

3. The combined shock absorber according to claim 1, characterized in that: In the small hole flow damper assembly, the movable slide rod passes through the damping cavity and is located at the center thereof; The first fixing bolt and the second fixing bolt are respectively arranged on both sides of the damping chamber, and the two are symmetrically distributed; The inner surface of the damping cavity is treated with nickel-based alloy and solid lubricant (MoS2 / WS2).

4. The combined vibration damper for a compressor based on the small hole flow theory as claimed in claim 1, characterized in that: The first nut passes through the first vibration isolation mounting block and is tightly fitted with the first nut.

5. The combined vibration damper for a compressor based on the small hole flow theory as claimed in claim 1, characterized in that: The first steel wire damping rope, the second steel wire damping rope, the third steel wire damping rope and the fourth steel wire damping rope are evenly distributed in space in a symmetrical manner, one end of which is connected to the first vibration isolation mounting block, and the other end of which is connected to the second vibration isolation mounting block.

6. The combined vibration damper for a compressor based on the small hole flow theory as claimed in claim 1, characterized in that: The first limiting ring and the second limiting ring are spatially symmetrical, one end of the first limiting ring is connected to the first vibration isolation mounting block, and the other end of the second limiting ring is connected to the second vibration isolation mounting block.

7. The combined vibration damper for a compressor based on the small hole flow theory as claimed in claim 1, characterized in that: The first damping spring, the second damping spring, the third damping spring and the fourth damping spring are evenly and symmetrically distributed in space.

8. The combined vibration damper for a compressor based on the small hole flow theory as claimed in claim 1, characterized in that: The first fixing bolt and the second fixing bolt are respectively and symmetrically distributed on both sides of the damper.

9. The combined vibration damper for a compressor based on the small hole flow theory as claimed in claim 1, characterized in that: The movable sliding rod passes through the damping chamber and is located in the middle.

10. The combined vibration damper for a compressor based on the small hole flow theory as claimed in claim 1, characterized in that: The inner surface of the damping cavity is treated with nickel-based alloy + solid lubricant, electroplating or laser cladding process, and the lubricant content is controlled at 3-5wt%.

Images