CN216080489U - Throttle valve for a line and line having a throttle valve - Google Patents

Abstract

The utility model relates to a throttle valve for a pipeline and a pipeline with the throttle valve. The throttle valve is arranged in the pipeline wall of pipeline along circumference, wherein, the throttle valve includes in proper order along pipeline flow direction: a reducing section, the inner diameter of which is gradually reduced from the pipeline wall along the pipeline flowing direction; the flow limiting part is continuously connected with the diameter reducing section; and the diameter expanding section is continuously connected with the flow limiting part, and the inner diameter of the diameter expanding section is gradually increased along the flowing direction of the pipeline until the pipeline wall is transited.

Description

Throttle valve for a line and line having a throttle valve

Technical Field

The utility model relates to the technical field of pipelines, in particular to a throttle valve which is used for pipelines and has a microstructure and is suitable for broadband noise elimination. The utility model also relates to a pipeline with a throttle valve.

Background

Noise is inevitably generated in the cabin of the aircraft during flight. The noise source of an aircraft passenger cabin can be roughly divided into two parts: noise transmitted from outside the fuselage and noise generated inside the aircraft. External noise sources include mainly engine noise and airframe surface turbulent boundary layer noise. The internal noise sources of the aircraft mainly include flow-induced noise of the air conditioning pipe system and equipment operation noise. The noise varies in frequency from one source to another.

The air-conditioning pipeline system consists of a large number of pipelines, and the throttle valve is an important part used for controlling the flow at different air outlets in the air-conditioning pipeline system and is used in the pipeline system in a large number. A schematic of a prior art throttle valve is shown in fig. 1A and 1B.

The pneumatic noise generated by the upstream air flowing through the throttle valve is the main source of the noise of the air conditioning pipeline, and the noise of the throttle valve is generated as shown in figure 1C. And the noise is broadband noise, i.e. has low, medium and high frequency noise, and is difficult to control.

At present, a method for installing a silencer is mostly adopted for controlling the noise of an air conditioner pipeline, but the foam type sound absorption material has a good sound absorption effect on medium-high frequency noise due to the fact that the foam type sound absorption material absorbs the kinetic energy of sound waves, and a satisfactory sound absorption effect on low-frequency noise is difficult to obtain; and the anti-type silencer is generally narrow in silencing frequency band and large in size. The method for installing the silencer does not solve the problem of noise generation fundamentally, only does the countermeasure work of troubleshooting and bottom holding, and does not accord with the concept of forward design; the additional addition of the silencer not only increases the design period and cost, but also brings challenges to weight reduction of the aircraft.

Accordingly, there remains a need for further improvements in the construction of existing throttle valves.

SUMMERY OF THE UTILITY MODEL

The technical problem to be solved by the utility model is as follows: a throttle valve for a pipeline is provided, which can at least partially suppress or even eliminate flow-induced noise in pipeline noise.

To solve the above problems, the present invention provides a choke valve for a pipeline, the choke valve being circumferentially arranged in a pipeline wall of the pipeline, wherein the choke valve comprises in order in a pipeline flow direction: a reducing section, the inner diameter of which is gradually reduced from the pipeline wall along the pipeline flowing direction; the flow limiting part is continuously connected with the diameter reducing section; and the diameter expanding section is continuously connected with the flow limiting part, and the inner diameter of the diameter expanding section is gradually increased along the flowing direction of the pipeline until the pipeline wall is transited.

According to an aspect of the utility model, the gradually narrowing profile shape of the reducing section is designed to be smooth, and the gradually expanding profile shape of the expanding section is designed to be smooth.

According to one aspect of the utility model, the gradually narrowing profile shape of the reducing section is designed to conform to the outer contour of the turbulent recirculation zone upstream of the flow restriction.

According to one aspect of the utility model, the gradually expanding profile shape of the expanding section is designed to conform to the outer contour of the turbulent recirculation zone downstream of the flow restriction.

According to one aspect of the utility model, the flow restriction is configured as a plateau, the inner diameter of which is kept constant in the line flow direction.

According to one aspect of the utility model, the reducing section, the flow restriction and the expanding section of the throttle valve are each composed of a plurality of units, wherein the units have a chamber wall which defines a chamber, the chamber wall extending from the conduit wall in the radial direction of the conduit, the other end of the chamber wall defining an opening, and the opening opens radially inwards into the interior of the conduit.

According to one aspect of the utility model, the chamber wall of the unit has at least one chamber wall projection which extends perpendicularly to the radial direction of the pipeline towards the interior of the chamber and blocks a portion of the chamber.

According to one aspect of the utility model, the chamber size of each of the cells making up the reduced diameter section is dimensioned to correspondingly absorb sound waves in the 500 Hz-1000 Hz frequency band; the size and the dimension of a cavity of each unit forming the current limiting part are designed to correspondingly absorb sound waves in a frequency range of 1000 Hz-1500 Hz; and the size of the cavity of each of the plurality of expanding sections is designed to correspondingly absorb sound waves in the 1500 Hz-2000 Hz frequency band.

According to one aspect of the utility model, the chambers of the cells are dimensioned to delay the phase of the sound waves of the frequency band to which the cells correspond by the corresponding phase according to the different sections in which they are located. This enables the plurality of units to reflect the sound waves of the frequency band corresponding to the unit in a directional manner, and the sound waves of the frequency band corresponding to each section out of the sound waves transmitted from the upstream of the pipeline to the throttle valve are reflected toward the upstream of the pipeline.

A pipeline according to the utility model, wherein the pipeline has a throttling valve according to any of the above aspects.

The throttling valve of the utility model limits the flow of the pipeline by utilizing the flow limiting part of the throttling valve, and increases the reducing section and the expanding section with streamline shapes to eliminate turbulent flow return areas at the upstream and the downstream of the throttling valve, thereby reducing the pulsating pressure to inhibit the noise of the pipeline.

Different positions of the throttle valve are divided into different frequency band reflection areas, and the corresponding acoustic metamaterial structures are adopted to control the refraction direction, so that the noise of the corresponding frequency band is reflected towards the upstream at different positions of the throttle valve. In addition, the throttle valve can further reduce pipeline noise by adopting a foam sound absorption material.

Drawings

For a more complete understanding of the present invention, reference is made to the following description of exemplary embodiments, which is to be considered in connection with the accompanying drawings. The drawings are to scale and are not necessarily to scale, emphasis instead being placed upon clearly illustrating the drawings.

In the drawings:

FIG. 1A is a side view of a prior art line with a choke;

FIG. 1B is an end view of a prior art line with a choke;

FIG. 1C is a schematic illustration of a turbulent recirculation zone of a throttle valve of the prior art; and

fig. 2 is a schematic view of a pipeline with a throttle valve according to a preferred embodiment of the present invention.

List of reference numerals:

1 pipe wall

2 existing throttle valve

10 throttle valve

11 reducing section

12 flow restriction part

13 expanding diameter section

21A first direction

21B second direction

21C third direction

22A fourth direction

22B fifth direction

22C sixth direction

23A seventh Direction

23B in the eighth direction

23C ninth direction

Detailed Description

The present invention is further described in the following description with reference to specific embodiments and the accompanying drawings, wherein the details are set forth in order to provide a thorough understanding of the present invention, but it is apparent that the present invention can be embodied in many other forms different from those described herein, and it will be readily appreciated by those skilled in the art that the present invention can be implemented in many different forms without departing from the spirit and scope of the utility model.

In various embodiments of the present invention, a "tube radial direction" is defined as a direction perpendicular to the central axis of the tube and extending from the tube wall in a positive direction toward the interior of the tube.

Fig. 2 schematically shows a throttle valve 10 according to a preferred embodiment of the utility model, which is arranged circumferentially in the pipe wall 1 of the pipeline. The flow-induced noise of the throttle valve is mainly generated in the turbulent reflux zone generated upstream and downstream of the throttle valve as shown in fig. 1C. In one embodiment, in order to eliminate the turbulent reflux region, the throttle valve 10 is added with a reducing section 11 and an expanding section 13 which are continuously connected with the flow restriction part and are positioned at the upstream and downstream of the flow restriction part on the basis of the throttle valve in the prior art so as to block the turbulent reflux region at the upstream and downstream. Also, the restriction of the throttle valve 10 remains at the same reduced inner diameter as the throttle valve 2 of the prior art.

In the preferred embodiment, the inner diameter of the reduced diameter section 11 of the throttling valve 10 tapers away from the conduit wall 1 in the direction of the conduit flow. Preferably, the tapering profile shape of the reduced diameter section 11 from the conduit wall 1 to the flow restriction 12 can be designed to be smooth, i.e. substantially straight or streamlined. The profile designed in this way enables the turbulent recirculation zone on the left (upstream) side of the throttle valve to be at least partially eliminated, becoming a vortex zone that produces less turbulence at the profile surface of the reduced diameter section 11, greatly reducing the generation of noise.

Preferably, the gradually narrowing profile shape of the reduced diameter section 11 may be designed to conform to the outer profile of the turbulent recirculation zone to the left of the throttle valve in fig. 1C. The required flow and the required reduced internal diameter for a given line position of the choke are designed on demand, so that the profile of the turbulent recirculation zone to the left of the choke is formed according to the narrowest point of the choke. The profile shape design of the reducing section 11 is such that a turbulent flow backflow area formed at the narrowest part of the throttling valve, namely the flow limiting part, is completely eliminated, and a turbulent flow eddy area with smaller turbulence is generated only on the profile surface of the reducing section 11, so that the generation of noise is greatly reduced.

In a preferred embodiment, the flow restriction 12 may be further configured as a gradual segment, i.e. the flow restriction 12 expands in the flow direction. The inner diameter of the flat section remains substantially constant in the direction of the pipeline flow, i.e. allows for some undulation. The addition of the flat sections enables the fluid flowing into and out of the flow restriction 12 to flow more smoothly.

In a preferred embodiment, the expanding section 13 is continuously connected to the restriction, the inner diameter of the expanding section 13 increasing gradually with the direction of the pipeline flow until the transition to the pipe wall 1. Preferably, the gradually expanding contour of the expanding section 13 from the flow restriction 12 to the duct wall 1 can also be designed to be smooth. More preferably, the gradually expanding profile shape of the expanding section 13 may also be designed to conform to the outer profile of the turbulent recirculation zone to the right (downstream) of the throttle valve in fig. 1C.

Furthermore, due to advances in manufacturing technology, it is known that constructing common materials (such as metals, polymers) into an acoustic metamaterial structure can additionally have a function of reflecting sound waves of a corresponding frequency band. The individual segments of the throttle valve 10 according to the utility model are therefore preferably each designed as an acoustic metamaterial structure which can be designed to delay the phase of the sound waves of a specific frequency band by a certain phase.

Specifically, each of the reducing diameter section 11, the restricting portion 12, and the expanding diameter section 13 of the throttle valve 10 is composed of a plurality of units. The cells may have an elongated and minute tube structure with a cross section of an obtuse circle or a rectangle or a hexagon, thereby forming a dense array structure. Each of these units has a cavity wall defining a hollow interior chamber, the cavity wall extending from the conduit wall 1 in a conduit radial direction towards the conduit interior, the other end of the cavity wall defining an opening and the opening passing radially inwards into the conduit interior.

For a single unit of the acoustic metamaterial structure, sound waves of noise propagating in a pipeline propagate to an opening of the unit to enter an inner cavity, and the unit can be designed to enable sound waves of specific frequency bands in the noise to cause the cavity of the unit to resonate, so that the phase of incident sound waves of the specific frequency bands is delayed and then reflected out. Preferably, the cavity wall of the unit may have at least one cavity wall protrusion, the cavity wall protrusion extends toward the interior of the cavity in a direction perpendicular to the radial direction of the pipeline and blocks a part of the cavity, and the cavity wall protrusion designed after analysis according to the software model is favorable for resonance of the cavity of the unit and the sound wave of the specific frequency band, so that the phase of the incident sound wave of the specific frequency band is delayed and then reflected.

According to the generalized refractive index principle and the interference principle of the sound waves, the single unit delays the phase of the incident sound waves of the specific frequency band, so that the combined structure of the multiple units reflects the incident sound waves of the specific frequency band in a preset reflection direction. Therefore, the acoustic metamaterial structure can be designed to control the reflection direction of the sound waves of a specific frequency band.

When the silencer is installed in the prior art, the sound absorption effect is good only for medium-high frequency noise, and the satisfactory sound absorption effect is difficult to obtain for broadband low-frequency noise. Preferably, the throttle valve 10 of the present invention is designed such that the chamber size of each of the plurality of cells making up the reducing section 11 is dimensioned to correspondingly absorb sound waves in the 500 Hz-1000 Hz frequency band. And the size is designed to delay the phase of the sound wave of the 500 Hz-1000 Hz frequency band corresponding to the units, so that the units of the reducing section 11 can directionally reflect the sound wave of the 500 Hz-1000 Hz frequency band, namely, the reflection direction of the sound wave can be controlled.

Preferably, as shown in fig. 2, the first direction 21A represents the general direction of the incident reduced-diameter section 11 of the sound wave in the frequency range of 500 Hz-1000 Hz, the second direction 21B represents the general direction of the reflection corresponding to the first direction 21A, and the third direction 21C represents the general direction of the reflected sound wave corresponding to the second direction 21B, it being understood that the sound wave is still fan-shaped, the general direction referring to the general direction of the reflection of the sound wave via a series of points of incidence. The sound waves in the frequency range from 500Hz to 1000Hz in the line are thus at least partially reflected back, so that the throttle valve 10 also functions as a sound absorber.

It is also preferred that the throttle valve 10 of the present invention determines the shape of the throttle valve based on the line size, flow parameters, and further designed such that the chamber size of each of the plurality of cells making up the flow restriction 12 is dimensioned to correspondingly absorb sound waves in the 1000 Hz-1500 Hz band. And the size is designed to delay the phase of the sound wave of the 1000 Hz-1500 Hz frequency band corresponding to the units, so that the units of the current limiter 12 are designed to reflect the sound wave of the 1000 Hz-1500 Hz frequency band directionally.

It is also preferable that the fourth direction 22A, the fifth direction 22B and the sixth direction 22C in fig. 2 represent the general directions of the incident flow restriction 12, the primary reflection and the secondary reflection of the sound wave in the 1000 Hz-1500 Hz frequency band, so that the sound wave in the 1000 Hz-1500 Hz frequency band in the pipeline is at least partially reflected back.

It is also preferred that each of the plurality of cells comprising the expanded diameter section 13 has a chamber sized to correspondingly absorb sound waves in the 1500 Hz-2000 Hz frequency band. And the size is designed to delay the phase of the sound wave of 1500 Hz-2000 Hz frequency band corresponding to the units, so that the units of the expanding diameter section 13 can be designed to directionally reflect the sound wave of 1500 Hz-2000 Hz frequency band.

It is also preferable that the seventh direction 23A, the eighth direction 23B, and the ninth direction 23C in fig. 2 represent the general directions of the incident expanded diameter section 13, the primary reflection, and the secondary reflection of the sound wave in the 1500 Hz-2000 Hz band, so that the sound wave in the 1500 Hz-2000 Hz band in the pipeline is at least partially reflected back.

It is understood that the present invention corresponds to only three sets of low frequency bands according to the serial structure of the reducing section 11, the current limiter 12 and the expanding section 13, but is not limited thereto in practice, and may be further divided finely as necessary. The reducing section 11 may for example be divided in an upstream half-section and a downstream half-section, each substructure acting on a respective frequency band, for example 500 Hz-700 Hz and 700 Hz-1000 Hz.

In addition, the acoustic metamaterial structure can be foam sound absorption materials such as foam metal, foam polymer, foam ceramic and the like, and the materials can absorb medium-high frequency noise and further reduce pipeline noise.

By adopting the throttling valve, the aerodynamic shape of the baffle plate of the throttling valve is optimally designed, the flow of a pipeline is limited by the flow limiting part of the throttling valve, and a smoothly-transitional reducing section and a smoothly-transitional expanding section with streamline shapes are added between the pipeline wall and the flow limiting part of the throttling valve, so that turbulent flow return regions at the upstream and the downstream of the throttling valve are eliminated, a pressure pulsation source can be inhibited, and noise is fundamentally weakened.

Aiming at different frequency bands in noise, different positions of the throttle valve are divided into a plurality of reflecting areas, the corresponding acoustic metamaterial structure is laid on the wall of the pipeline to control the refraction direction, the sound wave transmission path is changed, the noise of the corresponding frequency band is reflected towards the upstream at different positions of the throttle valve, and the noise is partially counteracted with the upstream noise to suppress the noise.

The acoustic metamaterial structure can be conveniently manufactured through 3D printing, can be directly embedded into a pipeline for fixing, and is easy to install. The material can be foam sound absorption materials such as foam ceramic and the like, and can absorb medium and high frequency noise and further reduce pipeline noise.

While various embodiments have been described above, it should be understood that they have been presented by way of example only, and not limitation. It will be apparent to those skilled in the relevant art that the disclosed subject matter can be embodied in other specific forms without departing from the spirit or essential characteristics thereof. The present embodiments are, therefore, to be considered in all respects as illustrative and not restrictive, and not restrictive.

Claims (10)

1. A choke for a line, which choke is arranged circumferentially in a line wall (1) of the line,

it is characterized in that the throttle valve comprises in sequence along the pipeline flow direction:

a reducing section (11), the inner diameter of the reducing section (11) tapering from the conduit wall (1) with the direction of conduit flow;

a flow restriction (12), said flow restriction (12) being continuously connected with said reducing section (11); and

a diameter expansion section (13), wherein the diameter expansion section (13) is continuously connected with the flow restriction, and the inner diameter of the diameter expansion section (13) gradually increases along the flow direction of the pipeline until the pipeline wall (1) is transited.

2. The throttling valve of claim 1,

the gradually contracting contour of the reducing section (11) is designed to be smooth, and the gradually expanding contour of the expanding section (13) is designed to be smooth.

3. The throttling valve of claim 2,

the tapering profile shape of the reducing section (11) is designed to conform to the outer profile of the turbulent recirculation zone upstream of the flow restriction (12).

4. The throttling valve of claim 2,

the gradually expanding profile shape of the expanding section (13) is designed to conform to the outer profile of the turbulent recirculation zone downstream of the flow restriction (12).

5. The throttling valve of claim 1,

the flow restriction (12) is configured as a plateau, the inner diameter of which remains constant in the line flow direction.

6. The throttling valve of claim 1,

the reducing section (11), the flow restriction (12) and the expanding section (13) of the throttle valve are each composed of a plurality of units,

wherein the unit has a chamber wall defining a chamber, which chamber wall extends from the conduit wall (1) in a conduit radial direction, the other end of the chamber wall defining an opening, and the opening reaching radially inwards into the conduit interior.

7. The throttling valve of claim 6,

the chamber wall of the unit has at least one chamber wall protrusion extending perpendicular to the pipeline radial direction towards the interior of the chamber and blocking a portion of the chamber.

8. The throttling valve of claim 7,

the chamber size of each of the units constituting the reducing section (11) is dimensioned to correspondingly absorb sound waves in the frequency band range of 500-1000 Hz;

the chamber size of each of the units making up the flow restriction (12) is dimensioned to correspondingly absorb sound waves in the frequency band range 1000-1500 Hz; and

the chambers of each of the plurality of expanded diameter sections (13) are dimensioned to absorb sound waves in the frequency range from 1500Hz to 2000 Hz.

9. The throttling valve of claim 8,

the size and the dimension of the cavity of the unit are designed to delay the phase of the sound wave of the frequency band corresponding to the unit by the corresponding phase according to different sections.

10. A pipeline having a choke, characterized in that the pipeline has a choke according to any one of claims 1-9.

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