Self-adaptive frequency modulation pipeline system airflow pulsation attenuation device and compressor assembly

Abstract

The utility model provides an adaptive frequency modulation pipeline system air pulsation attenuation device and compressor assembly, including pipeline, the outer surface of pipeline is provided with at least one adjusting assembly, the adjusting assembly includes the regulating valve, one end of the regulating valve is communicated with the pipeline, the other end of the regulating valve is connected with the attenuation cavity, the adjusting valve and the attenuation cavity form a Helmholtz resonant cavity, a controller is arranged on the adjusting valve, and the controller is used for controlling the adjusting valve to adjust the effective through-flow area so as to adjust the attenuation frequency of the airflow pulsation attenuation device and automatically match the excitation source frequency of airflow pulsation. According to the embodiment of the utility model, when the airflow pulsation frequency in a pipeline system deviates, the attenuation frequency of the Helmholtz resonant cavity is adjusted by adjusting the position of the hole shielding plate, changing the flow area of the through-flow plate and adjusting the attenuation frequency of the Helmholtz resonant cavity, so that the attenuation frequency of the airflow pulsation resonant cavity is matched with the airflow pulsation excitation frequency, and the airflow pulsation of the pipeline system is attenuated; and vibration noise induced by airflow pulsation is reduced.

Description

Technical Field

[0001] The utility model relates to the technical field of airflow attenuation devices, and more specifically, to an airflow pulsation attenuation device for a pipeline system with adaptive frequency modulation and a compressor assembly. Background Art

[0002] A compressor is a general power device used to change the pressure of a gas and transport the gas. During operation, it will generate periodic airflow pulsations, which are transmitted downstream through the pipeline system, inducing the pipeline system to generate vibration and radiate noise. In response to the call for energy conservation and emission reduction, the application field of variable-frequency compressors is becoming more and more extensive. The excitation frequency of compressor airflow pulsations changes with the operating speed. Therefore, the excitation frequency of airflow pulsations will no longer be fixed, but a frequency range interval, resulting in an increase in the difficulty of attenuating airflow pulsations.

[0003] The Helmholtz airflow pulsation attenuator is a commonly used pulsation reduction device. At present, the theoretical research and practical application of the Helmholtz airflow pulsation attenuator have reached a very high level, but they have a common feature that the structure is fixed and the noise reduction frequency range remains unchanged. When the frequency change range of the excitation source is large, the noise reduction frequency range can only be expanded by means of parallel or series connection, resulting in a large volume and high pressure loss, bringing many inconveniences to practical applications. Summary of the Utility Model

[0004] In view of this, the utility model aims to provide an airflow pulsation attenuation device for a pipeline system with adaptive frequency modulation and a compressor assembly to solve the technical problem in the prior art that when the frequency change range of the excitation source is large, the noise reduction frequency range can only be expanded by means of parallel or series connection, resulting in a large volume and high pressure loss.

[0005] One aspect of the utility model provides an airflow pulsation attenuation device for a pipeline system with adaptive frequency modulation, including a pipeline. At least one adjustment component is arranged on the outer surface of the pipeline. The adjustment component includes a regulating valve. One end of the regulating valve is communicated with the pipeline, and the other end of the regulating valve is connected to an attenuation cavity. The regulating valve and the attenuation cavity form a Helmholtz resonance cavity. A controller is arranged on the regulating valve, and the controller is used to control the regulating valve to adjust the effective flow area to adjust the attenuation frequency of the airflow pulsation attenuation device so as to automatically match the excitation frequency of the airflow pulsation.

[0006] In some embodiments, 2 adjustment components are arranged on the outer surface of the pipeline. The 2 adjustment components are symmetrically arranged based on the center axis of the pipeline and are arranged in the same plane as the pipeline.

[0007] In some embodiments, the regulating valve includes a connecting pipe, a flow-through plate and a hole-blocking plate are arranged in the connecting pipe, flow-through holes are arranged on the flow-through plate, and the hole-blocking plate can rotate radially in the connecting pipe to block some of the flow-through holes on the flow-through plate so as to adjust the effective flow-through area.

[0008] In some embodiments, the flow-through plate is circular and matches the cross-sectional dimension of the connecting pipe, and the hole-blocking plate is a semi-circular plate that is concentric with the flow-through plate and has the same radius.

[0009] In some embodiments, a sealing device is arranged between the flow-through plate and the connecting pipe in the circumferential direction.

[0010] In some embodiments, the flow-through plate is divided into two semi-circular parts along the diameter direction, and the flow-through holes are arranged on one of the semi-circular parts.

[0011] In some embodiments, the flow-through holes are round holes or waist-shaped holes.

[0012] In some embodiments, the rotation angle of the hole-blocking plate is 0° - 180°.

[0013] In some embodiments, the adjustment range of the proportion of the effective flow-through area in the area of the flow-through plate is 1% - 40%.

[0014] On the other hand, the present utility model provides a compressor assembly, which includes a compressor and the pipeline system airflow pulsation attenuation device described in any one of the above, and the pipeline is connected to the exhaust end of the compressor or serves as the exhaust pipeline of the compressor.

[0015] Embodiments of the present utility model are used to, especially when the airflow pulsation frequency in the pipeline system deviates, by adjusting the position of the hole-blocking plate, changing the flow-through area of the flow-through plate, adjusting the attenuation frequency of the Helmholtz resonance cavity, making the attenuation frequency of the airflow pulsation resonance cavity coincide with the airflow pulsation excitation frequency, attenuating the airflow pulsation in the pipeline system, and reducing the vibration noise induced by the airflow pulsation.

[0016] To make the above objects, features and advantages of the present utility model more obvious and understandable, the following specifically enumerates preferred embodiments and, in conjunction with the accompanying drawings, makes a detailed description as follows. Description of the Drawings

[0017] In the accompanying drawings, which are not necessarily drawn to scale, the same reference numerals may describe similar components in different views. The same reference numerals with alphabetical suffixes or different alphabetical suffixes may represent different instances of similar components. The drawings generally illustrate various embodiments by way of example and not limitation, and are used in conjunction with the description and the claims to explain the disclosed embodiments. Where appropriate, the same reference numerals are used throughout the drawings to refer to the same or similar parts. Such embodiments are illustrative and not intended to be an exhaustive or exclusive embodiment of the device or method. The drawings described herein are used to provide a further understanding of the present utility model and form a part of this application. The illustrative embodiments of the present utility model and their descriptions are used to explain the present utility model and do not constitute an improper limitation of the present utility model. In the drawings:

[0018] Figure 1 is a schematic structural view of an air flow pulsation attenuation device for an adaptive frequency modulation pipeline system provided by the present utility model;

[0019] Figure 2 is a first schematic structural view of a regulating valve in an air flow pulsation attenuation device for an adaptive frequency modulation pipeline system provided by the present utility model;

[0020] Figure 3 is a second schematic structural view of a regulating valve in an air flow pulsation attenuation device for an adaptive frequency modulation pipeline system provided by the present utility model.

[0021] Among them, the above-mentioned drawings include the following reference numerals:

[0022] 1 - pipeline; 2 - regulating valve; 3 - attenuation cavity; 4 - controller; 21 - connecting pipe; 22 - flow-through plate; 23 - orifice plate; 24 - flow-through hole. Detailed Embodiments

[0023] Next, specific embodiments of the present utility model will be described in detail with reference to the drawings, but this is not a limitation of the present utility model.

[0024] It should be understood that various modifications can be made to the embodiments disclosed herein. Therefore, the above description should not be regarded as a limitation, but only as an example of the embodiments. Those skilled in the art will think of other modifications within the scope and spirit of the present utility model.

[0025] The drawings included in the description and forming a part of the description illustrate the embodiments of the present utility model, and together with the general description of the present utility model given above and the detailed description of the embodiments given below are used to explain the principles of the present utility model.

[0026] These and other features of the present utility model will become apparent from the following description of the preferred forms of the embodiments given as non - limiting examples with reference to the accompanying drawings.

[0027] It should also be understood that although the present utility model has been described with reference to some specific examples, those skilled in the art can surely implement many other equivalent forms of the present utility model, which have the features as described in the claims and thus are all within the protection scope defined hereby.

[0028] When combined with the accompanying drawings, the above - mentioned and other aspects, features and advantages of the present utility model will become more apparent in view of the following detailed description.

[0029] Hereinafter, specific embodiments of the present utility model will be described with reference to the accompanying drawings; however, it should be understood that the disclosed embodiments are only examples of the present utility model, which can be implemented in various ways. Well - known and / or repetitive functions and structures are not described in detail to avoid obscuring the present utility model with unnecessary or redundant details. Therefore, the specific structural and functional details disclosed herein are not intended to be limiting, but are only used as a basis and representative basis for the claims to teach those skilled in the art to use the present utility model in substantially any suitable detailed structure in a variety of ways.

[0030] It should be noted that the terms "first", "second", etc. in the description and claims of the present utility model and in the above - mentioned accompanying drawings are used to distinguish similar objects and do not necessarily have to be used to describe a specific order or sequence. It should be understood that such used data can be interchanged under appropriate circumstances so that the embodiments of the present utility model described herein can be implemented in an order other than those illustrated or described herein. In addition, the terms "comprising" and "having" and any variations thereof are intended to cover non - exclusive inclusion. For example, a process, method, system, product or device comprising a series of steps or units does not necessarily have to be limited to those clearly listed steps or units, but may include other steps or units not clearly listed or inherent to these processes, methods, products or devices.

[0031] This specification may use the phrase "in one embodiment", "in another embodiment", "in yet another embodiment" or "in other embodiments", all of which may refer to one or more of the same or different embodiments according to the present utility model.

[0032] The first embodiment of the present utility model provides an air - flow pulsation attenuation device for a pipeline system with adaptive frequency modulation. This embodiment is mainly based on the principle of Helmholtz resonance cavity, and reduces the vibration noise induced by air - flow pulsation by attenuating the air - flow pulsation in the pipeline system.

[0033] As Figures 1 to 3As shown, the airflow pulsation attenuation device of the pipeline system includes a pipeline 1. Here, the pipeline 1 can be connected to the exhaust end of a compressor, for example, or serve as the exhaust pipeline of the compressor. At least one adjustment component is provided on the outer surface of the pipeline 1. Here, the adjustment component is used to attenuate the airflow pulsation in the pipeline 1 to reduce the vibration noise induced by the airflow pulsation. Of course, multiple such adjustment components can also be provided at different positions on the outer surface of the pipeline 1. Here, the number of the adjustment components can be determined according to the degree of attenuation required.

[0034] Further, the adjustment component includes a regulating valve 2. One end of the regulating valve 2 is communicated with the pipeline 1. Here, one end of the regulating valve 2 is connected to the pipeline 1 through, for example, a flange, so that the gas in the pipeline 1 enters the regulating valve 2. The other end of the regulating valve 2 is connected to an attenuation cavity 3. In this way, the gas entering the regulating valve 2 enters the attenuation cavity 3 for attenuation. In addition, a controller 4 is provided on the regulating valve 2. Here, the controller 4 is used to control the regulating valve 2 to adjust the effective flow area to adjust the attenuation frequency of the airflow pulsation attenuation device, so as to automatically match the excitation source frequency of the airflow pulsation. Here, the regulating valve 2 and the attenuation cavity 3 form a Helmholtz resonance cavity, and the airflow pulsation is attenuated through the Helmholtz resonance cavity.

[0035] In one embodiment, for example, 2 such adjustment components are provided on the outer surface of the pipeline 1. The 2 adjustment components are arranged at different positions along the outer diameter of the pipeline 1, so that the degree of airflow attenuation can be improved.

[0036] Preferably, the 2 adjustment components can be symmetrically arranged based on the center axis of the pipeline 1 and are arranged in the same plane as the pipeline 1. In this way, by symmetrically installing the regulating valve 2 and the attenuation cavity 3 in the circumferential direction of the pipeline 1, the unbalanced force excited by the airflow pulsation in the attenuation cavity 3 in the 2 adjustment components can be balanced with each other, and the airflow pulsation in the pipeline 1 can be attenuated to the greatest extent.

[0037] Specifically, the regulating valve 2 includes a connecting pipe 21. A flow plate 22 and a hole-blocking plate 23 are arranged in the connecting pipe 21. Here, the flow plate 22 and the hole-blocking plate 23 can be arranged in the middle of the connecting pipe 21. The flow plate 22 is circular and matches the cross-sectional size of the connecting pipe 21. A sealing device is arranged between the flow plate 23 and the connecting pipe 21 in the circumferential direction. The hole-blocking plate 23 is a semi-circular shape concentric with and having the same radius as the flow plate 22.

[0038] Specifically, the flow-through plate 22 is divided into two semi-circular parts along the diameter direction, and flow-through holes 24 are provided on one of the semi-circular parts. The equivalent area of the flow-through holes 24 here is 10%-40% of the area of the flow-through plate 22, and the gas in the pipeline 1 can pass through the flow-through holes 24. In addition, the flow-through holes 24 here are circular holes or kidney-shaped holes.

[0039] In this embodiment, the hole-blocking plate 23 can rotate radially in the connecting pipe 21 to block some of the flow-through holes 24 on the flow-through plate 22. Specifically, the hole-blocking plate 23 is connected to the driving device through a transmission device, so that it rotates along the circumferential direction under the driving action of the controller 4. The rotation angle here is 0°-180°. By rotating to block some of the flow-through holes 24 on the flow-through plate 22, the effective flow-through area of the flow-through plate 22 is changed by the rotation of the hole-blocking plate 23, so as to adjust the attenuation frequency of the Helmholtz resonance cavity, thereby matching the excitation frequency of the airflow pulsation in the pipeline 1, attenuating the airflow pulsation of the pipeline system, and finally reducing the vibration noise induced by the airflow pulsation. The adjustment range of the proportion of the effective flow-through area in the area of the flow-through plate 22 here is 1%-40%.

[0040] It should be noted that generally, the natural frequency of the airflow pulsation attenuation cavity is mainly related to the medium sound speed, the volume of the resonance cavity, the length of the damping channel, and the flow-through area of the damping channel. Therefore, when the medium sound speed, the volume of the resonance cavity, and the damping channel are not easy to change, the flow-through area of the damping channel can be changed to adjust the attenuation frequency of the Helmholtz resonance cavity. In terms of adjusting the flow-through area of the damping channel of the Helmholtz resonance cavity, the controller 4 is controlled according to the compressor operating speed signal. The controller 4 drives the hole-blocking plate 23 to generate a certain rotation angle, changing the area of the hole-blocking plate 23 blocking the flow-through holes 24, so as to increase or decrease the effective flow-through area of the flow-through holes 24, realize the adjustment of the attenuation frequency of the Helmholtz resonance cavity, and finally match the airflow pulsation excitation frequency of the compressor.

[0041] When using this embodiment, when the operating speed of the compressor changes, that is, when the frequency change range of the excitation source is large, the operating speed signal is transmitted to the controller 4. After receiving the motor operating speed signal, the controller 4 controls the rotation angle of the hole-blocking plate 23 in the regulating valve 2, changes the degree of the hole-blocking plate 23 blocking the flow-through holes 24, increases or decreases the effective flow-through area of the flow-through holes 24, adjusts the attenuation frequency of the Helmholtz resonance cavity, and matches the airflow pulsation excitation frequency of the compressor.

[0042] The second embodiment of the present utility model provides a compressor assembly, which includes a compressor and the pipeline system airflow pulsation attenuation device in the above first embodiment.

[0043] The embodiments of the present utility model are used to, especially when the airflow pulsation frequency in a pipeline system shifts, adjust the position of the orifice plate, change the flow area of the flow plate, and adjust the attenuation frequency of the Helmholtz resonance cavity, so that the attenuation frequency of the airflow pulsation resonance cavity coincides with the airflow pulsation excitation frequency, attenuate the airflow pulsation in the pipeline system, and reduce the vibration noise induced by the airflow pulsation.

[0044] In the above embodiments of the present utility model, the descriptions of each embodiment have their own emphases. For the parts not detailed in a certain embodiment, reference can be made to the relevant descriptions of other embodiments.

[0045] For the sake of description, spatial relative terms such as "above...", "over...", "on the upper surface of...", "upper" etc. can be used here to describe the spatial position relationship between a device or feature shown in the figure and other devices or features. It should be understood that the spatial relative terms are intended to include different orientations in use or operation in addition to the orientation described in the figure for the device. For example, if the device in the drawing is inverted, the device described as "above other devices or structures" or "over other devices or structures" will then be positioned as "below other devices or structures" or "under other devices or structures". Thus, the exemplary term "above..." can include both the orientations of "above..." and "below...". The device can also be positioned in other different ways, rotated 90 degrees or in other orientations, and corresponding explanations are made for the spatial relative descriptions used here.

[0046] In addition to the above, it should also be noted that the "one embodiment", "another embodiment", "embodiment" etc. mentioned in this specification refer to the specific features, structures or characteristics described in connection with that embodiment being included in at least one embodiment generally described in this application. The same expression appearing in multiple places in the specification does not necessarily refer to the same embodiment. Further, when describing a specific feature, structure or characteristic in connection with any one embodiment, it is intended that implementing such feature, structure or characteristic in connection with other embodiments also falls within the scope of the present utility model.

[0047] In the above embodiments, the descriptions of each embodiment have their own emphases. For the parts not detailed in a certain embodiment, reference can be made to the relevant descriptions of other embodiments.

[0048] The above are only the preferred embodiments of the present utility model and are not used to limit the present utility model. For those skilled in the art, the present utility model can have various changes and modifications. Any modification, equivalent replacement, improvement, etc. made within the spirit and principle of the present utility model shall be included in the protection scope of the present utility model.

Claims

1. An adaptive frequency modulation pipeline system air flow pulsation attenuation device, characterized in that: It comprises a pipeline, at least one regulating component is arranged on the outer surface of the pipeline, the regulating component comprises a regulating valve, one end of the regulating valve is connected to the pipeline, the other end of the regulating valve is connected to the attenuation cavity, the regulating valve and the attenuation cavity form a Helmholtz resonance cavity, a controller is arranged on the regulating valve, the controller is used to control the regulating valve to adjust the effective flow area to adjust the attenuation frequency of the airflow pulsation attenuation device so as to automatically match the excitation source frequency of the airflow pulsation, the regulating valve comprises a connecting pipe, a flow plate and a hole-shielding plate are arranged in the connecting pipe, flow holes are arranged on the flow plate, and the hole-shielding plate can rotate radially in the connecting pipe to cover part of the flow holes on the flow plate to adjust the effective flow area.

2. The pipeline system airflow pulsation attenuation device with adaptive frequency modulation according to claim 1 is characterized in that: Two adjusting components are arranged on the outer surface of the pipeline, and the two adjusting components are symmetrically arranged based on the central axis of the pipeline and are arranged in the same plane as the pipeline.

3. The pipeline system air flow pulsation attenuation device with adaptive frequency modulation according to claim 1 is characterized in that: The flow plate is circular and matches the cross-sectional size of the connecting pipe, and the perforated plate is a semicircle that is concentrically arranged with the flow plate and has the same radius as the flow plate.

4. The pipeline system air flow pulsation attenuation device with adaptive frequency modulation according to claim 1 is characterized in that: The flow plate and the connecting pipe are provided with a sealing device in the circumferential direction.

5. The pipeline system airflow pulsation attenuation device with adaptive frequency modulation according to claim 1, characterized in that: The flow plate is divided into two semicircular parts along the diameter direction, and the flow hole is arranged on one of the semicircular parts.

6. The pipeline system airflow pulsation attenuation device with adaptive frequency modulation according to claim 1, characterized in that: The through-flow hole is a round hole or a waist-shaped hole.

7. The pipeline system air flow pulsation attenuation device with adaptive frequency modulation according to claim 1, characterized in that: The rotation angle of the perforated plate is 0°-180°.

8. The pipeline system airflow pulsation attenuation device with adaptive frequency modulation according to claim 1, characterized in that: The ratio of the effective flow area to the flow plate area is adjusted in a range of 1% to 40%.

9. A compressor assembly, characterized in that: The invention comprises a compressor and an airflow pulsation attenuation device of a pipeline system with adaptive frequency modulation according to any one of claims 1 to 8, wherein the pipeline is connected to the exhaust end of the compressor or serves as the exhaust pipeline of the compressor.

Images