Turbine expander

Abstract

The utility model provides a turbo expander, which relates to the technical field of noise reduction of turbo expanders, and comprises a shell, an inner cavity is arranged in the shell, and a group of middle sound insulation layers are arranged in the inner cavity. According to the utility model, by virtue of a composite noise reduction structure of the middle sound insulation layer and the inner noise reduction layer in the shell, double blocking and absorption of a noise transmission path are realized, and the middle sound insulation layer is made of a high-density material and practically reflects and attenuates noise energy according to a quality law; the porous structure of the inner silencing layer effectively absorbs residual noise through viscous damping and a heat exchange mechanism, the design practically creates a quiet working environment for operators, the harm of noise to human bodies is effectively reduced, the ventilation and noise reduction system on the top organically combines a small fan, a silencing air pipe and a silencing shutter, and the noise reduction effect is good. While ventilation and heat dissipation requirements of the equipment are fully guaranteed, leakage of aerodynamic noise is inhibited, and the problem that ventilation and noise reduction of traditional equipment are difficult to consider is solved.

Description

TECHNICAL FIELD

[0001] The utility model relates to turbine expander sound attenuation technical field especially relates to a turbine expander. BACKGROUND

[0002] In the modern industrial production system, with the in-depth promotion of green manufacturing, sustainable development concept, the requirement of industrial equipment operation environment is more and more strict, noise pollution as one of the main pollution sources of industrial environment, not only can cause irreversible damage to the hearing, nervous system of operating personnel, but also can interfere with the normal life of surrounding residents, cause environmental protection complaints and other social problems, therefore, various countries have introduced strict industrial noise control standards, such as our country's industrial enterprise factory boundary environmental noise emission standard makes clear limitation to industrial noise emission of different regions and different time periods, international standardization organization (ISO) also formulates a series of industrial noise control specifications, under this background, the low noise design of industrial equipment has become the inevitable trend of industry development, is the key element of enterprise's competitive power and social responsibility fulfillment.

[0003] Turbine expander as the core equipment in the field of energy conversion, is widely used in air separation device, natural gas liquefaction, chemical refrigeration and other industrial fields, its working principle is to convert the internal energy of gas into mechanical energy by expanding the gas in the impeller, in this process, high strength noise can be generated by high-speed flow of gas, high-speed operation of mechanical parts, relevant research data shows that the noise generated by the traditional turbine expander during operation can reach 85-100 decibels, far exceeding the safe operation noise threshold (generally considered that the safe noise threshold of 8 hours exposure is 85 decibels), therefore, effectively reducing the noise in the operation process of turbine expander has important significance for protecting the health of operating personnel, improving the stability of equipment operation and meeting the requirements of environmental protection regulations.

[0004] Defects of prior art:

[0005] 1) Single noise reduction structure: the noise reduction measures of existing turbine expander mostly adopt single sound insulation cover structure, only by increasing the thickness of the shell or simply laying a small amount of sound-absorbing material on the inner side of the shell to realize noise reduction, this single noise reduction method cannot comprehensively control the multiple links of noise generation and propagation, the suppression effect of high frequency noise, aerodynamic noise and other special frequency band noise is poor, it is difficult to meet the increasingly strict noise reduction standard.

[0006] 2) poor functional synergy: traditional noise reduction design often ignores the synergy between equipment ventilation and noise reduction. In order to ensure the normal operation of the turbo expander, good ventilation condition is needed to take away the heat generated by the operation of the equipment, but the setting of the ventilation opening will cause the noise to leak out, and the existing turbo expander cannot effectively solve this contradiction in design, or sacrifice the ventilation performance to strengthen the noise reduction, resulting in overheating of the equipment and affecting the operation efficiency and service life; or in order to ensure ventilation, the noise control effect is greatly reduced, and the optimization of equipment performance cannot be realized. Practical new type content

[0007] The utility model aims at solving the problems of single noise reduction structure, difficult to effectively suppress special frequency band noise and poor functional synergy between equipment ventilation and noise reduction in the prior art, and proposes a turbo expander.

[0008] In order to realize the above-mentioned purpose, the utility model adopts the following technical scheme: a turbo expander, comprising: a shell, an internal cavity is formed in the inside of the shell, a group of middle layer sound insulation layers are placed in the inside of the internal cavity, an inner layer sound absorbing layer is placed in the inside of the internal cavity, the inside of the internal cavity and the outer wall of the middle layer sound insulation layer are mutually adhered, a small fan is fixedly installed in the inside of the shell, a sound absorbing air pipe is fixedly communicated with the output end of the small fan, and sound absorbing cotton is uniformly laid on the inner wall of the sound absorbing air pipe.

[0009] Preferably, the top of the shell is fixedly installed with a mounting frame, a group of sound absorbing louvers are fixedly installed on the opposite sides of the mounting frame, and a sound absorbing plate is arranged in each sound absorbing louver.

[0010] Preferably, a mounting circular groove is formed in the top of the shell, a sealing ring is embedded in the inside of the mounting circular groove, and the inner wall of the sealing ring is tightly adhered to the outer wall of the sound absorbing air pipe.

[0011] Preferably, a turbo expander body is arranged in the inside of the shell, a group of transmission pipelines are fixedly communicated with the outer wall of the turbo expander body, and the input end and the output end of the turbo expander body are communicated with two transmission pipelines respectively.

[0012] Preferably, the bottom of the turbo expander body is fixedly connected with a mounting seat, and the inner bottom of the shell and the mounting portion of the mounting seat are fixedly connected through bolts.

[0013] Preferably, the input end of the small fan is used for driving air circulation through the sound absorbing air pipe and the sound absorbing louver in the inside of the shell, and continuously adsorbing noise energy.

[0014] Preferably, the outer surface of the shell is hingedly sealed with a set of maintenance cabinet doors, the inner surface of each of the maintenance cabinet doors is provided with a mounting groove, the mounting groove is embedded with a soundproof board, and a handle is fixedly installed in each of the mounting grooves.

[0015] Compared with the prior art, the utility model has the advantages and positive effects that:

[0016] 1. In the utility model, the double blocking and absorbing of the noise propagation path are realized by the composite noise reduction structure of the middle sound insulation layer and the inner sound insulation layer in the shell, the middle sound insulation layer adopts high-density material, the noise energy is effectively reflected and attenuated according to the mass law, the porous structure of the inner sound insulation layer effectively absorbs the residual noise through the viscous damping and heat exchange mechanism, the design effectively creates a quiet working environment for the operator, effectively reduces the harm of noise to the human body, and the ventilation and noise reduction system at the top organically combines the small fan, the sound attenuation air pipe and the sound attenuation louver, fully guarantees the ventilation and heat dissipation demand of the equipment, suppresses the external leakage of the aerodynamic noise, and solves the problem that the traditional equipment ventilation and noise reduction are difficult to consider.

[0017] 2. In the utility model, the combination of the circular groove and the sealing ring installed at the top of the shell ensures the sealed connection of the sound attenuation air pipe and the shell, eliminates the air leakage to generate additional noise, prevents the external noise from entering, the maintenance cabinet door adopts the hinge sealing structure and is embedded with the soundproof board, on the basis of facilitating the equipment maintenance and repair, the sealing property of the whole device is guaranteed, the noise leakage from the maintenance opening is avoided, the turbine expander body is rigidly connected with the inner bottom of the shell through the mounting seat and the bolt, the vibration noise during the equipment operation is effectively reduced, the noise generation is controlled from the root, and the multi-dimensional and systematic structural design greatly improves the low-noise performance and the operation stability of the turbine expander, has extremely high engineering application value and market competitiveness. BRIEF DESCRIPTION OF DRAWINGS

[0018] Figure 1 A front view of a turbine expander is provided for the utility model;

[0019] Figure 2 A side sectional view of a turbine expander is provided for the utility model;

[0020] Figure 3 A sectional split structure perspective view of a turbine expander is provided for the utility model;

[0021] Figure 4 Another part of a sectional split structure perspective view of a turbine expander is provided for the utility model;

[0022] Figure 5 A sound attenuation air pipe split structure perspective view of a turbine expander is provided for the utility model.

[0023] Figure legend: 1, shell; 11, internal cavity; 12, middle layer sound insulation layer; 13, inner layer sound insulation layer; 2, access cabinet door; 21, mounting groove; 22, sound insulation board; 23, handle; 3, mounting frame; 31, sound insulation louver; 32, sound insulation board; 4, small fan; 41, sound insulation air pipe; 42, sound insulation cotton; 5, mounting round groove; 51, sealing ring; 6, turbine expander body; 61, transmission pipeline; 62, mounting seat. DETAILED DESCRIPTION

[0024] In order to enable the above-mentioned purposes, features and advantages of the present application to be more clearly understood, the present application will be further described below with reference to the drawings and examples. It should be noted that the examples of the present application and the features in the examples can be combined with each other without conflict.

[0025] In the following description, many specific details are set forth in order to provide a thorough understanding of the present application, but the present application can also be practiced in other ways different from those described herein, therefore, the present application is not limited to the specific examples disclosed in the following description.

[0026] Example 1: Please refer to the accompanying Figure 1 -Appendix Figure 5 As shown in the accompanying drawings, the present application provides a turbine expander, which comprises: a shell 1, an internal cavity 11 is formed in the shell 1, a group of middle layer sound insulation layers 12 are placed in the internal cavity 11, an inner layer sound insulation layer 13 is placed in the internal cavity 11, the internal cavity 11 and the outer wall of the middle layer sound insulation layer 12 are mutually adhered, a small fan 4 is fixedly installed in the shell 1, a sound insulation air pipe 41 is fixedly communicated with the output end of the small fan 4, and the inner wall of the sound insulation air pipe 41 is uniformly paved with sound insulation cotton 42.

[0027] The effect achieved by the entire example 1 is that the middle layer sound insulation layer 12 and the inner layer sound insulation layer 13 in the shell 1 form a double noise reduction barrier, the middle layer sound insulation layer 12 blocks most of the noise from spreading outward by virtue of its dense structure, reducing the strength of noise penetrating the shell 1; the inner layer sound insulation layer 13 absorbs the noise entering the internal cavity 11 by its porous structure, converting sound energy into heat energy and consuming it, and suppressing noise from the inside to the outside, the small fan 4, the sound insulation air pipe 41 and the sound insulation cotton 42 inside constitute a ventilation and noise reduction assembly, the small fan 4 drives air to flow in the sound insulation air pipe 41, and the sound insulation cotton 42 can absorb the noise generated by air flow and fan operation, avoiding the accumulation of this part of noise inside the equipment or the diffusion of this part of noise outward.

[0028] Example 2: Please refer to the accompanying Figure 1 -Appendix Figure 5As shown, the top of the shell 1 is fixedly installed with a mounting frame 3, and a group of sound-absorbing louvers 31 are fixedly installed on the opposite sides of the mounting frame 3. The inside of each sound-absorbing louver 31 is provided with a sound-absorbing plate 32. One end of the mounting circular groove 5 and the sound-absorbing louvers 31 are matched with each other.

[0029] The effect achieved by the entire embodiment 2 is that the sound-absorbing louvers 31 on the mounting frame 3 and the sound-absorbing plates 32 inside further process the noise on the air circulation path. When the air passes through the sound-absorbing louvers 31, the sound-absorbing plates 32 reflect and absorb the noise, so that the noise emitted from the air vent is greatly reduced, thereby effectively controlling the noise leakage while realizing the equipment ventilation and heat dissipation function.

[0030] Embodiment 3: please refer to the attached Figure 1 -attached Figure 5 As shown, the top of the shell 1 is provided with a mounting circular groove 5, and a sealing ring 51 is embedded in the inside of the mounting circular groove 5. The inner wall of the sealing ring 51 is tightly matched with the outer wall of the sound-absorbing air pipe 41.

[0031] The effect achieved by the entire embodiment 3 is that the sealing ring 51 in the mounting circular groove 5 ensures that the sound-absorbing air pipe 41 is tightly connected with the top of the shell 1. It prevents air from leaking from the connection gap to generate additional noise, and also avoids external noise from entering the equipment interior through the gap, thereby protecting the sealing performance and integrity of the noise reduction system.

[0032] Embodiment 4: please refer to the attached Figure 1 -attached Figure 5 As shown, the inside of the shell 1 is provided with a turbo expander body 6. The outer wall of the turbo expander body 6 is fixedly connected with a group of transmission pipelines 61. Two transmission pipelines 61 are respectively connected to the input end and the output end of the turbo expander body 6. The bottom of the turbo expander body 6 is fixedly connected with a mounting seat 62. The inner bottom of the shell 1 and the mounting part of the mounting seat 62 are fixedly connected through bolts.

[0033] The effect achieved by the entire embodiment 4 is that the installation and connection mode of the turbo expander body 6 is clear. The stable mounting structure avoids additional noise caused by equipment shaking and component collision, thereby ensuring that the turbo expander body 6 remains stable during operation and reducing the noise source caused by mechanical vibration.

[0034] Embodiment 5: please refer to the attached Figure 1 -attached Figure 5 As shown, the input end of the small fan 4 is used to drive the air circulation through the sound-absorbing air pipe 41 and the sound-absorbing louvers 31 inside the shell 1, thereby continuously adsorbing noise energy.

[0035] The effect achieved by the whole embodiment 5 is that the small fan 4 drives the air circulation through the sound-absorbing duct 41 and the sound-absorbing louver 31, forming a continuous noise absorption cycle. The air carries the noise generated inside the equipment to the sound-absorbing components during the flow process, so that the noise energy is continuously absorbed and consumed, maintaining a low-noise environment inside the equipment.

[0036] Embodiment 6: please refer to the attached Figure 1 -attached Figure 5 As shown in the figure, the outer surface of the shell 1 is hingedly sealed with a set of maintenance cabinet doors 2. The inner surface of each maintenance cabinet door 2 is provided with a mounting groove 21. The mounting groove 21 is embedded with a sound insulation board 22. The outer surface of each maintenance cabinet door 2 is fixedly installed with a handle 23.

[0037] The effect achieved by the whole embodiment 6 is that the maintenance cabinet door 2 is provided to facilitate the maintenance of the equipment and ensure the noise reduction performance. The sound insulation board 22 is embedded in the mounting groove 21 of the maintenance cabinet door 2. When the maintenance cabinet door 2 is closed, the sound insulation board 22 cooperates with the shell 1 to prevent noise from leaking from the maintenance opening. The handle 23 facilitates the opening and closing of the maintenance cabinet door 2 by the operator. The hinged sealing design of the cabinet door further improves the overall sealing performance.

[0038] Working principle: At the noise source control level, the turbo expander body 6 is rigidly connected to the inner bottom of the shell 1 through the bottom mounting seat 62 using high-strength bolts. This tight installation method significantly improves the natural frequency of the overall structure of the equipment, avoiding additional vibration noise caused by resonance during operation. By reasonably designing the structural parameters of the mounting seat 62, the vibration amplitude during equipment operation can be controlled at a low level, thereby reducing the noise excitation source caused by mechanical vibration from the root, creating favorable conditions for subsequent noise control.

[0039] At the noise propagation path control level, the middle sound insulation layer 12 is made of high-density sound insulation materials such as lead alloy plates or special steel plates. Based on the law of mass, these materials have a large surface density, which will inevitably hinder the propagation of sound waves under the action of sound waves. When noise waves enter the middle sound insulation layer 12, most of the sound energy is reflected back into the equipment, and the remaining part is converted into heat energy after multiple reflections and refractions due to the internal friction between the molecules in the material, thereby significantly reducing the noise penetration intensity. The inner sound-absorbing layer 13 is made of porous sound-absorbing materials such as polyester fiber sound-absorbing cotton or centrifugal glass wool. According to the principle of porous sound absorption, the large number of interconnected micro-pores inside form a complex acoustic structure. When noise enters the internal cavity 11 and comes into contact with the inner sound-absorbing layer 13, the sound wave causes the vibration of the air in the pores. The viscous resistance and heat conduction between the air and the pore wall will inevitably convert sound energy into heat energy dissipation, achieving efficient absorption of noise. The gradient noise reduction effect of the double-layer structure significantly weakens the propagation ability of noise.

[0040] For the air dynamic noise generated during the operation of the device, the small fan 4 drives the air to circulate in the sound attenuation air pipe 41, and the sound attenuation cotton 42 coated on the inner wall of the sound attenuation air pipe 41 has a similar sound absorption mechanism with the inner sound attenuation layer 13. In the process of noise propagation generated by air flow and fan operation, the sound attenuation cotton 42 will inevitably dissipate noise energy through the viscous damping and heat exchange of air in the pores. When the airflow carrying residual noise enters the sound attenuation louvers 31 in Embodiment 2, the sound attenuation plates 32 inside the sound attenuation louvers 31 based on the acoustic reflection and absorption principle make the noise reflect multiple times on the surface of the sound attenuation plates 32. Part of the noise is reflected back to the sound attenuation air pipe 41 and is absorbed by the sound attenuation cotton 42 again, and the other part is directly absorbed by the sound attenuation plates 32, thereby effectively inhibiting the leakage of air dynamic noise while ensuring the ventilation and heat dissipation performance of the device.

[0041] The sealing ring 51 installed in the circular groove 5 is made of high-elastic rubber material, and based on the elastic sealing principle, under the assembly pressure, the sealing ring 51 tightly fits the outer wall of the sound attenuation air pipe 41 and the inner wall of the mounting circular groove 5 of the top of the outer shell 1, forming a reliable sealing interface, effectively preventing additional noise generated by air leakage, and at the same time, isolating the external noise from entering the device. The maintenance cabinet door 2 is designed with a hinge sealing structure, and the sound insulation plate 22 embedded in the installation groove 21 forms a sealing surface with the outer shell 1 through precise fitting. When the maintenance cabinet door 2 is closed, the sound insulation plate 22 fills the gap between the cabinet door and the outer shell 1, and in combination with the sealing rubber strip design at the hinge, a complete sealing protection system is built to prevent the device internal noise from leaking from the maintenance opening, and to ensure the noise reduction performance of the entire device.

[0042] The wiring diagram of the middle sound insulation layer 12, the inner sound attenuation layer 13, the small fan 4, the sound attenuation air pipe 41, the sound attenuation cotton 42 and the turbo expander body 6 in the utility model belongs to the common knowledge in the field, and its working principle is a known technology. The model is selected according to actual use, so the control mode and wiring arrangement of the middle sound insulation layer 12, the inner sound attenuation layer 13, the small fan 4, the sound attenuation air pipe 41, the sound attenuation cotton 42 and the turbo expander body 6 are not explained in detail.

[0043] The above is only a preferred embodiment of the utility model, and is not a limitation on other forms of the utility model. Any skilled person in the art can modify or change the above disclosed technical content to equivalent embodiments applied to other fields, but any simple modification, equivalent change and modification made on the basis of the technical essence of the utility model to the above embodiments still belongs to the protection scope of the utility model technical scheme.

Claims

1. A turboexpander, characterized in that: include: A shell (1) is provided with an internal cavity (11) inside the shell (1), a group of middle sound insulation layers (12) are placed inside the internal cavity (11), an inner sound-absorbing layer (13) is placed inside the internal cavity (11), the interior of the internal cavity (11) and the outer wall of the middle sound insulation layer (12) are in contact with each other, a small fan (4) is fixedly installed inside the shell (1), an output end of the small fan (4) is fixedly connected to a sound-absorbing air duct (41), and the inner wall of the sound-absorbing air duct (41) is evenly paved with sound-absorbing cotton (42).

2. A turboexpander according to claim 1, characterized in that: A mounting frame (3) is fixedly mounted on the top of the housing (1), a group of sound-absorbing louvers (31) are fixedly mounted on the opposite side of the mounting frame (3), and a sound-absorbing plate (32) is provided inside each of the sound-absorbing louvers (31).

3. A turboexpander according to claim 2, characterized in that: A mounting circular groove (5) is provided on the top of the housing (1), a sealing ring (51) is embedded in the interior of the mounting circular groove (5), the inner wall of the sealing ring (51) is tightly fitted with the outer wall of the silencer air duct (41), and one end of the mounting circular groove (5) and the silencer louver (31) cooperate with each other.

4. A turboexpander according to claim 3, characterized in that: A turbine expander body (6) is provided inside the housing (1), and a group of transmission pipes (61) are fixedly connected to the outer wall of the turbine expander body (6), and two of the transmission pipes (61) are respectively connected to the input end and the output end of the turbine expander body (6).

5. A turboexpander according to claim 4, characterized in that: The bottom of the turbine expander body (6) is fixedly connected to a mounting seat (62), and the inner bottom of the housing (1) and the mounting portion of the mounting seat (62) are fixedly connected by bolts.

6. The turboexpander according to claim 3, wherein: The input end of the small fan (4) is used to drive air to circulate inside the housing (1) through the silencer duct (41) and the silencer louvers (31), thereby continuously absorbing noise energy.

7. The turboexpander according to claim 5, characterized in that: A group of inspection cabinet doors (2) are hingedly and sealedly provided on the outer surface of the housing (1), and a mounting groove (21) is provided on the inner surface of each inspection cabinet door (2), a sound insulation board (22) is embedded in the interior of the mounting groove (21), and a handle (23) is fixedly installed on the outer surface of each inspection cabinet door (2).

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