CN203453704U - Fluid pulse attenuation structure, steering oil pipe pulse attenuation device and automobile - Google Patents
Fluid pulse attenuation structure, steering oil pipe pulse attenuation device and automobile Download PDFInfo
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- CN203453704U CN203453704U CN201320461340.5U CN201320461340U CN203453704U CN 203453704 U CN203453704 U CN 203453704U CN 201320461340 U CN201320461340 U CN 201320461340U CN 203453704 U CN203453704 U CN 203453704U
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Abstract
The utility model relates to a fluid pulse attenuation structure, a steering oil pipe pulse attenuation device and an automobile. The fluid pulse attenuation structure comprises a first channel and a second channel. The first channel is used for fluids to flow through and in a linear shape. The second channel is in a cylindrical spiral shape and is arranged on the first channel in a looping and coaxial mode or arranged parallel to the first channel in the axial direction. The second channel is provided with a first diverging opening and a second diverging opening, wherein the first diverging opening and the second diverging opening keep fluid communication with the first channel and are mutually separated in the axial direction of the first channel. Thus, when the fluids flow through the first channel, part of the fluids are diverted through the first diverting opening to enter the second channel, flow out of the second channel through the second diverging opening and enter the first channel to be converged. In addition, the length of the second channel between the first diverging opening and the second diverging opening is larger than the axial length of the first channel between the first diverging opening and the second diverging opening by lambda/2, wherein lambda is the wavelength of a periodical pressure pulsation wave of the fluids flowing in the first channel and the second channel.
Description
Technical field
The utility model relates to attenuate pulsations structure, relates in particular to a kind of fluid pulsation attenuating structure, steering oil pipe attenuate pulsations device and automobile.
Background technique
In the prior art, hydraulic system is widely used.For example by way of example, in passenger car, adopted more hydraulic system, such as hydraulic power-assist steering system.In previous steering oil pipe design, adopt as the elder brother of Fig. 1 principle gram (Quincke) filtering tube form, yet, if turn to the hard tube of high-voltage tube to adopt this kind of existing structure form, will find branched pipe will be very long, and the narrow limitation in space, passenger vehicle engine cabin causes and is unfavorable for carrying out oil pipe layout conventionally.On the other hand, adopt the occasion of fluid for medium, the velocity of propagation of pressure wave in this medium will reach about 1380m/s.As shown in Figure 1, if wish the pressure pulse wave that the periodicity of a 25Hz of elimination is propagated, the length L of so needed branched pipe ' be:
From above relation, can find out, remove outside the length L of main pipeline, branched pipe is at least than the long 27.6m of main pipeline.Obviously, this cannot arrange in the engine compartment of passenger car.Therefore, be starved of the branched pipe that improves a multi-parameter of design and realize the shared space of saving as much as possible branched pipe in limited space, thereby provide one more preferably to select for practical application.
Model utility content
In view of this, the purpose of this utility model is to provide a kind of fluid pulsation attenuating structure, steering oil pipe attenuate pulsations device and automobile, thereby effectively solves the problem of the above-mentioned and other aspect existing in prior art.
For realizing above-mentioned model utility object, the technical solution adopted in the utility model is as follows:
A fluid pulsation attenuating structure, described fluid pulsation attenuating structure comprises:
First passage, it is for supplying fluid to flow through and being wire; And
Second channel, it is cylindrical screw shape, and be arranged on first passage with coaxial manner ring set, or be arranged in parallel vertically with first passage, second channel has and keeps fluid to be communicated with first passage and along the first minute fork and the second minute fork that are axially spaced apart from each other of first passage, so that fluid its part when flowing through first passage enters second channel via fork shunting in first minute, and then via second minute fork, flow out second channel and enter first passage and collect, and large λ/2 of axial length of the first passage between first minute fork of the second channel Length Ratio between first minute fork and second minute fork and second minute fork, wherein λ is the wavelength of the periodic pressure pulsating wave of streaming flow in first passage and second channel.
In above-mentioned fluid pulsation attenuating structure, alternatively, the number of turns N of the cylindrical screw of described second channel and pitch P meet following relation:
The diameter that wherein D is cylindrical screw.
In above-mentioned fluid pulsation attenuating structure, alternatively, described first passage and second channel adopt same material to make.
In above-mentioned fluid pulsation attenuating structure, alternatively, described fluid is hydraulic oil, and the number of turns N of the cylindrical screw of described second channel and pitch P meet following relation:
Wherein
V
c-spherical wave in unbounded volume medium on a large scale or nominal or the feature propagation speed of the plane wave in the pipeline of a unlimited rigidity;
K-this volumetric modulus of elasticity of unbounded volume medium on a large scale;
The internal diameter of d-second channel;
The tube wall of E-Young's modulus of elasticity or second channel is equivalent Young's modulus radially;
T-time.
A steering oil pipe attenuate pulsations device, described steering oil pipe attenuate pulsations device is configured to have the fluid pulsation attenuating structure as described in above any one.
An automobile, is provided with fluid pulsation attenuating structure as described in above any one or steering oil pipe attenuate pulsations device as previously discussed on described automobile.
The beneficial effects of the utility model are: first, the extra selection of attenuating pulsation noise is provided by the utility model, it be narrow frequency device and be suitable for attenuation of specific frequencies under disturb people's noise, the noise that especially can cause for two, three rank pulsation of hydraulic steering pump is decayed.Secondly, the utility model is the improved form to original elder brother gram filtering tube, can reduce the size of device, is convenient to realize arrange in various vehicles.And, by principle of the present utility model is out of shape, can also realize the decay of different frequency microseismic noise, this is owing to including a plurality of variablees in structural design of the present utility model, is therefore not limited to and is applied in automobile manufacturing field.If space allows, the cylindrical screw diameter D that can expand second channel in the utility model reduces required main leg's length L
flength.
Accompanying drawing explanation
Below with reference to drawings and Examples, the technical solution of the utility model is described in further detail.
Fig. 1 is the cross-sectional schematic that elder brother's gram wave filter-pressure wave is interfered attenuating device.
Fig. 2 is according to an embodiment's of fluid pulsation attenuating structure of the present utility model pipeline structure cross-sectional schematic.
The part relevant parameter of example structure in Fig. 2 has been shown in Fig. 3.
Fig. 4 is according to another embodiment's of fluid pulsation attenuating structure of the present utility model pipeline structure cross-sectional schematic.
Embodiment
It should be noted that, principle, feature and the advantage of fluid pulsation attenuating structure of the present utility model, steering oil pipe attenuate pulsations device and automobile will be illustrated by way of example below, yet all descriptions are only used for describing, and they should be interpreted as the utility model is formed to any restriction.In addition, in each mentioned herein embodiment, described or implicit any single technical characteristics, or be shown or lie in any single technical characteristics in each accompanying drawing, still can between these technical characteristicss (or its equivalent), proceed combination in any or delete, thereby obtain of the present utility model more other embodiments that may directly not mention in this article.
Design philosophy of the present utility model derives from elder brother's gram wave filter of interfering the attenuation principle that disappears mutually based on pressure wave, and it is the further improvement modification to its structure, thereby propose new-type improvement structure, for eliminating hydraulic pulsation, provides the selection in more designs.The utility model also can be applicable to as on other fluids such as gas.
Fig. 1 is the cross-sectional schematic that elder brother's gram wave filter-pressure wave is interfered attenuating device.Diffusion path length in the bang path Shang， of the periodic pressure ripple transmitting by its medium circular arc collateral branch pipe, there is the delay of half wavelength in the wave trajectory in the main pipeline between this.According to the working principle of this type of wave filter, the cycle pressure fluctuation of propagating to pipe downstream, when arriving circular arc collateral branch tube inlet place, start shunting and in whole branched pipe length He in main pipeline, propagate respectively, two-way fluid collection while arriving branched pipe outlet, thus meet 1/2 wavelength X or form 180 degree different phases.The final synthetic clean disturbance of pressure without amplitude in theory.
For example, the transversal pipe that the import and export of branched pipe are L by a segment length is cut apart, and this offseting phenomenon is by the length L of adjustment collateral branch pipe ' realize.If suppose L=λ, for meeting λ/2 phase delay, the length of branched pipe need meet so:
If can two groups of Oscillation Amplitude/grade sound waves identical and single spin-echo be combined by a device, so just noise can be eliminated completely.That is to say, the result after two cycle vibration cylinders identical with amplitude, single spin-echo are synthetic will, for zero, have been eliminated two vibration waves.When the sound wave of two single spin-echos meets, the malleation of one of them ripple overlaps with the negative pressure of another ripple, and forms balance, thus sound in intersection by elimination of interference.
According to above mentality of designing, as shown in Figure 2, fluid pulsation attenuating structure of the present utility model mainly comprises two parts.Wherein, first passage 1 is main passage or the main pipeline of fluid circulation, and it is used for supplying fluid to flow through and is wire; Collateral branch's paths that second channel 2 passes through for fluid tributary, it is cylindrical screw shape, and is arranged on first passage 1 with coaxial manner ring set; In Fig. 2, position shown in reference character 3 and 4 is respectively the position that first passage 1 is communicated with second channel 2, be that a part of fluid continues to advance along first passage 1 at 3 places, first minute fork, another part fluid enters helical duct through second channel 2, and finally at 4 places, second minute fork, collects and enter into first passage 1.As shown in Figure 2, first minute fork 3 and second minute fork 4 being axially spaced apart from each other along first passage 1, and large λ/2 of axial length of the Length Ratio of second channel 2 first passage 1 between them between them, wherein λ is the wavelength of the periodic pressure pulsating wave of streaming flow in first passage 1 and second channel 2.So, can realize incoming wave and reflected wave single spin-echo, thus the pressure wave vibration (pulsation) in can eliminate fluid.
As further illustrating, refer to Fig. 3, can to fluid pulsation attenuating structure parameter of the present utility model, arrange according to following these relations:
Wherein P is the pitch of the cylindrical screw of second channel 2, the diameter that D is this cylindrical screw, and the number of turns that N is this cylindrical screw, θ is lead angle.
In order to realize the two-way pressure wave of (being between main pipeline and branched pipe) between first passage 1 and second channel 2, carry out elimination of interference, need to meet following relation:
Need to meet following relation:
By way of example, because steel pipe length in passenger car hydraulic steering system is set up and has certain limitation at space cloth, therefore can be very not long, at this, can first suppose this part main leg length L
fdetermine, it is constant C, that is:
When design can be first according to can with arrangement space select the main pipeline length L of expecting
f, therefore next just can calculate by relation (4) number of turns N of cylindrical screw branched pipe:
As an example, can adopt same material to manufacture above-mentioned first passage and second channel, below how explanation is by adopting fluid pulsation attenuating structure of the present utility model to eliminate the hydraulic pulsation of 375Hz, and this frequency is generally three rank resonant frequencies of hydraulic steering pump output.For power steering fluid, it belongs to a kind of hydraulic oil, so the velocity of propagation of pressure wave in this liquid can be determined by following formula:
Wherein, V
cnominal or the feature propagation speed of-spherical wave (or the plane wave in the pipeline of a unlimited rigidity) in unbounded volume medium on a large scale;
K-this volumetric modulus of elasticity of unbounded volume medium on a large scale;
The internal diameter of d-second channel;
The tube wall of E-Young's modulus of elasticity or second channel is equivalent Young's modulus radially;
T-time.
For medium-sized fluid, the datum speed V of sound wave
c≈ 1332m/s, volumetric modulus of elasticity K=220000psi, by being filled with this liquid, Young's modulus Et ≈ 3 * 10
7in the steel pipe of psi and the situation of d/t=10, the pressure-wave emission speed of permission is about 1011m/s.
Therefore,, under said circumstances, the wavelength X of pressure wave in pipeline is:
Next just can determine the diameter D of the cylindrical screw of second channel.This size can first tentatively be selected with reference to the size of free space, for example this diameter D is set as to 50mm, the space taking so can be not excessive, can calculate the required number of turns N=47.41 circle of the cylindrical screw of second channel according to above relation (6).Therefore, the main leg's length L in fluid pulsation attenuating structure now
f=380mm.Can find, first passage in the utility model and second channel adopt when for example metallic material is made and applies it to automobile manufacturing field, second order or the three rank resonant frequencies of its steering pump that is suitable for decaying, and be not suitable for the decay of low-frequency noise (or hydraulic pulsation frequency), because can cause like this it oversize and be not suitable for the Environmental Conditions of passenger car.
Similarly, if change pipeline material into Φ 20 * 4 rubber hose, can eliminate the such low-frequency noise of 25Hz, and the cylindrical screw number of turns of the second channel being wound around will effectively be reduced to 15.44 circles, main flow development length now also only needs 310mm.
Fig. 4 is according to another embodiment's of fluid pulsation attenuating structure of the present utility model pipeline structure cross-sectional schematic.With above-described embodiment distinguishes in structural design be, in the embodiment who provides in Fig. 4, for the ease of practical application and easily manufactured and do not need necessarily the cylindrical screw pipeline section ring set of second channel to be arranged on first passage, and itself and first passage can be arranged in parallel vertically, under some application scenarios, bring so better practicability, repeat no more here herein.
Because fluid pulsation attenuating structure of the present utility model has above-mentioned these technical advantages and feature, be therefore applicable to very much applying it on steering oil pipe attenuate pulsations device, and they can be set on various automobiles.Certainly, also it is pointed out that the utility model is not limited to be applied to automotive field, as long as space allows its expansion to be applied to other industry.By increasing the diameter of the cylindrical screw of second channel, can reduce very neatly main leg's length L
fthereby, strengthened practicability and convenience.
More than enumerate example and illustrated in detail fluid pulsation attenuating structure of the present utility model, steering oil pipe attenuate pulsations device and automobile, these examples are only for explanation principle of the present utility model and mode of execution thereof, but not to restriction of the present utility model, in the situation that not departing from spirit and scope of the present utility model, those of ordinary skill in the art can also make various distortion and improvement.Therefore, all technological schemes that are equal to all should belong to category of the present utility model and be limited by every claim of the present utility model.
Claims (6)
1. a fluid pulsation attenuating structure, is characterized in that, described fluid pulsation attenuating structure comprises:
First passage, it is for supplying fluid to flow through and being wire; And
Second channel, it is cylindrical screw shape, and be arranged on first passage with coaxial manner ring set, or be arranged in parallel vertically with first passage, second channel has and keeps fluid to be communicated with first passage and along the first minute fork and the second minute fork that are axially spaced apart from each other of first passage, so that fluid its part when flowing through first passage enters second channel via fork shunting in first minute, and then via second minute fork, flow out second channel and enter first passage and collect, and large λ/2 of axial length of the first passage between first minute fork of the second channel Length Ratio between first minute fork and second minute fork and second minute fork, wherein λ is the wavelength of the periodic pressure pulsating wave of streaming flow in first passage and second channel.
2. fluid pulsation attenuating structure according to claim 1, is characterized in that, the number of turns N of the cylindrical screw of described second channel and pitch P meet following relation:
The diameter that wherein D is cylindrical screw.
3. fluid pulsation attenuating structure according to claim 1, is characterized in that, described first passage and second channel adopt same material to make.
4. fluid pulsation attenuating structure according to claim 3, is characterized in that, described fluid is hydraulic oil, and the number of turns N of the cylindrical screw of described second channel and pitch P meet following relation:
Wherein
V
c-spherical wave in unbounded volume medium on a large scale or nominal or the feature propagation speed of the plane wave in the pipeline of a unlimited rigidity;
K-this volumetric modulus of elasticity of unbounded volume medium on a large scale;
The internal diameter of d-second channel;
The tube wall of E-Young's modulus of elasticity or second channel is equivalent Young's modulus radially;
T-time.
5. a steering oil pipe attenuate pulsations device, is characterized in that, described steering oil pipe attenuate pulsations device is configured to have the fluid pulsation attenuating structure as described in any one in claim 1-4.
6. an automobile, is characterized in that, is provided with fluid pulsation attenuating structure or steering oil pipe attenuate pulsations device as claimed in claim 5 as described in any one in claim 1-4 on described automobile.
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201320461340.5U CN203453704U (en) | 2013-07-31 | 2013-07-31 | Fluid pulse attenuation structure, steering oil pipe pulse attenuation device and automobile |
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| CN201320461340.5U CN203453704U (en) | 2013-07-31 | 2013-07-31 | Fluid pulse attenuation structure, steering oil pipe pulse attenuation device and automobile |
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Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN106382231A (en) * | 2016-11-04 | 2017-02-08 | 西安交通大学苏州研究院 | Active screw compressor gas pulsation attenuating device |
| CN108087239A (en) * | 2017-12-13 | 2018-05-29 | 华中科技大学 | A kind of duct type active flow pulsation damping device for large reciprocating compressor |
| CN109780603A (en) * | 2018-11-27 | 2019-05-21 | 佛山市云米电器科技有限公司 | A kind of kitchen ventilator spiral case and kitchen ventilator with noise interference device |
-
2013
- 2013-07-31 CN CN201320461340.5U patent/CN203453704U/en not_active Expired - Fee Related
Cited By (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN106382231A (en) * | 2016-11-04 | 2017-02-08 | 西安交通大学苏州研究院 | Active screw compressor gas pulsation attenuating device |
| CN106382231B (en) * | 2016-11-04 | 2023-10-20 | 西安交通大学苏州研究院 | Active attenuation screw compressor air flow pulsation device |
| CN108087239A (en) * | 2017-12-13 | 2018-05-29 | 华中科技大学 | A kind of duct type active flow pulsation damping device for large reciprocating compressor |
| CN108087239B (en) * | 2017-12-13 | 2024-04-05 | 华中科技大学 | Pipeline type active airflow pulsation attenuation device for large reciprocating compressor |
| CN109780603A (en) * | 2018-11-27 | 2019-05-21 | 佛山市云米电器科技有限公司 | A kind of kitchen ventilator spiral case and kitchen ventilator with noise interference device |
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| GR01 | Patent grant | ||
| CF01 | Termination of patent right due to non-payment of annual fee |
Granted publication date: 20140226 Termination date: 20210731 |
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| CF01 | Termination of patent right due to non-payment of annual fee |