CN206957931U - A kind of exhaust silencer for screw unit - Google Patents
A kind of exhaust silencer for screw unit Download PDFInfo
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- CN206957931U CN206957931U CN201720757593.5U CN201720757593U CN206957931U CN 206957931 U CN206957931 U CN 206957931U CN 201720757593 U CN201720757593 U CN 201720757593U CN 206957931 U CN206957931 U CN 206957931U
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- pipe
- air inlet
- interpolation
- increaser
- screw unit
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F04—POSITIVE - DISPLACEMENT MACHINES FOR LIQUIDS; PUMPS FOR LIQUIDS OR ELASTIC FLUIDS
- F04C—ROTARY-PISTON, OR OSCILLATING-PISTON, POSITIVE-DISPLACEMENT MACHINES FOR LIQUIDS; ROTARY-PISTON, OR OSCILLATING-PISTON, POSITIVE-DISPLACEMENT PUMPS
- F04C29/00—Component parts, details or accessories of pumps or pumping installations, not provided for in groups F04C18/00 - F04C28/00
- F04C29/06—Silencing
- F04C29/061—Silencers using overlapping frequencies, e.g. Helmholtz resonators
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F04—POSITIVE - DISPLACEMENT MACHINES FOR LIQUIDS; PUMPS FOR LIQUIDS OR ELASTIC FLUIDS
- F04C—ROTARY-PISTON, OR OSCILLATING-PISTON, POSITIVE-DISPLACEMENT MACHINES FOR LIQUIDS; ROTARY-PISTON, OR OSCILLATING-PISTON, POSITIVE-DISPLACEMENT PUMPS
- F04C29/00—Component parts, details or accessories of pumps or pumping installations, not provided for in groups F04C18/00 - F04C28/00
- F04C29/06—Silencing
- F04C29/065—Noise dampening volumes, e.g. muffler chambers
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- Engineering & Computer Science (AREA)
- Mechanical Engineering (AREA)
- General Engineering & Computer Science (AREA)
- Exhaust Silencers (AREA)
- Applications Or Details Of Rotary Compressors (AREA)
Abstract
It the utility model is related to a kind of exhaust silencer for screw unit, including the sequentially air inlet pipe of straight line connection, suppressor case, escape pipe；Suppressor case is made up of by refrigerant flow direction increaser, straight tube, reducing pipe, and the rotary space sequentially combined in suppressor case is silencer cavity；It is characterized in that：One interpolation pipe of fixed setting in one of them at least in increaser and reducing pipe；Interpolation pipe with increaser or reducing pipe junction by inserting in silencer cavity；Through hole type stomata is offered on interpolation tube wall.On the premise of sound deadening capacity is ensured, make that the silencer pressure loss is smaller, and structure is simpler, and silencer is applied to the frequency-variable screw type unit that noise frequency changes greatly.
Description
Technical field
It the utility model is related to screw cold water heat pump, and in particular to a kind of for screw cold water source pump
Exhaust silencer.
Background technology
Screw cold water source pump generally existing exhaust gas pressure pulse, these exhaust gas pulses turn into audible sound in system
Source, influence noise and the vibration of whole unit.The method for cutting down exhaust gas pulses is usually in exhaust outlet of compressor or discharge duct
Upper installation silencer, this silencer are typically the reactive muffler of expander formula, and its noise-cancelling theory is to utilize the prominent of internal diameter of the pipeline
Become, sound wave is produced reflection and interference, so as to cut down the noise along pipe transmmision, but this silencer needs higher pipe
Road internal diameter divergence ratio, divergence ratio is typically designed as 3 ~ 4 in engineering, therefore this silencer is widely used in air slit diameter and existed
In below Φ 50mm refrigeration plant., generally can not for screw cold water source pump of the air slit diameter more than Φ 50mm
Directly pipe silencer is expanded in application, because this can make muffler volume excessively huge, influences the size and outward appearance of unit, relatively more normal
The method seen is that pipeline is expanded into certain proportion, then in expansion cavity arrange perforate dividing plate, the sound deadening capacity of this silencer with
Perforate diaphragm structure is closely related, and can produce certain pressure loss, influences unit performance, the noise elimination band of this silencer
It is wide narrow, apply in general to that noise frequency is unconverted to determine frequency unit, noise frequency random groups operating frequency can not be applied to
The frequency converter sets of change.Such as the silencer of 201520276726.8 utility models of the patent No. is exactly to belong to this type.
Utility model content
The technical problems to be solved in the utility model is to provide a kind of exhaust silencer for screw unit, uses
Less internal diameter of the pipeline divergence ratio, effectively reduces the exhaust gas pulses noise of screw cold water source pump, while makes silencer knot
Structure is simple, and the pressure loss is greatly reduced, and silencer is applied to the frequency-variable screw type machine that noise frequency changes greatly
Group.
Technical scheme is used by the utility model solves its technical problem：
A kind of exhaust silencer for screw unit, including sequentially the air inlet pipe of straight line connection, suppressor case, go out
Tracheae；Suppressor case is made up of by refrigerant flow direction increaser, straight tube, reducing pipe, is sequentially combined in suppressor case
Rotary space is silencer cavity；It is characterized in that：Fixed setting one in one of them at least in increaser and reducing pipe
Individual interpolation pipe；Interpolation pipe with increaser or reducing pipe junction by inserting in silencer cavity；Offered on interpolation tube wall logical
Pass stomata.
Further, when respectively setting an interpolation pipe in increaser and reducing pipe, two interpolation pipes are mutually not in contact with each other,
And orifice plate is fixedly installed in straight tube, silencer cavity is divided into the noise elimination cavity of two series connection by orifice plate.
Further, the air inlet pipe, escape pipe are respectively fixedly connected with suppressor case, junction sealing；Interpolation
The outer circumference surface of pipe one end is tightly connected with the inner peripheral surface of increaser or reducing pipe.
Further, the inner peripheral surface of the outer circumference surface of the orifice plate and straight tube is tightly connected, and one is opened up on the orifice plate
Individual through hole shape stomata, preferably aperture plate center open up through hole shape stomata.
Further, the air vent aperture of the orifice plate is identical with air inlet bore or bigger than air inlet bore.
Further, when respectively setting an interpolation pipe in increaser and reducing pipe, two interpolation length of tube are unequal.
Further, the ratio of the interpolation length of tube and suppressor case total length is 0.1 ~ 0.8.
Further, air inlet pipe or outlet bore where each interpolation bore is equal to or more than each.
Further, the internal diameter of the air inlet pipe and escape pipe is equal or different, the internal diameter ratio of air inlet pipe and escape pipe
For 0.6 ~ 1.
Further, the straight tube internal diameter of the suppressor case is bigger than air inlet bore, straight tube internal diameter and air inlet bore
Than for 1.1 ~ 3；The ratio of the suppressor case length and air inlet pipe diameter is 1.5 ~ 6.
Further, interpolation pipe hole diameter is 5mm ~ 35mm, and stoma number is 1 ~ 20.
Further, silencer is arranged in screw-type water chiller or source pump, sets compressor in the unit
On exhaust outlet or the blast pipe being connected with exhaust outlet of compressor.
Compared with prior art, the utility model has the advantages that：
（1）Reduce pressure fluctuation using the expansion chamber in suppressor case, the He Mu formed using perforate air inlet interpolation pipe
Hereby resonator reduces noise suddenly.Because the interpolation bore in air inlet pipe is more than or equal to air inlet bore, therefore refrigerant is from entering
Flow velocity will not raise when tracheae flow to air inlet interpolation pipe, be damaged so as to which silencer be greatly reduced along stroke pressure loss and local pressure
Lose.Compared with the silencer of the patent No. 201520276726.8, the utility model is on the premise of sound deadening capacity is ensured, silencer pressure
Power loss is smaller, and structure is simpler.And noise elimination cavity is divided into the noise elimination cavity of two series connection by orifice plate, silencer is applicable
In the frequency conversion screw unit of exhaust noise frequency random groups running frequency change.
（2）The internal diameter of air inlet interpolation pipe and orifice plate is identical or bigger than air inlet bore with air inlet bore, so that air-flow
When being flowed into air inlet interpolation pipe from air inlet pipe, flow velocity is constant or diminishes.Formula is lost according to along stroke pressure, when caliber increase, stream
Speed reduces, and when other parameters are constant, being lost along stroke pressure for turbulent flow reduces.Equally, flow velocity reduces, rapid when other parameters are constant
The local pressure loss of stream also reduces, therefore uses the not increased design of this air velocity, and the edge of pipeline can be greatly reduced
Stroke pressure loses and local pressure loss.
（3）It is simple in construction, reach noise elimination demand only with Helmholtz resonator.Due to the exhaust noise fundamental frequency of screw machine
Equal to the meshing frequency of screw rod, the general positive screw rod number of teeth is 4, and single screw rod spiral slot number is 6, therefore is compressed frequently surely for 60Hz
Machine, ignore the revolutional slip of motor, then the exhaust noise frequency of double-screw compressor is 240Hz and its harmonic wave；Single screw compressor
Exhaust noise frequency be 360Hz and its harmonic wave.Again because refrigeration screw compressor belongs to fuel injection helical lobe compressor, its noise figure
Higher frequency is typically fundamental frequency or its 2 times, 3 subharmonic.The particularly high unit of distributive value, its fundamental frequency noise is often highest
, therefore only need during muffler desing targetedly to eliminate Middle and low frequency noise can and meet design requirement.And adopt
After the utility model structure, only retain Helmholtz resonance cavity structure of airtight, omit various diaphragm structure cans acquirements and patent
Number 201520276726.8 identical soundproof effects.
（4）The exhaust noise fundamental frequency of frequency conversion screw unit is also the meshing frequency of screw rod, the fortune of its meshing frequency random groups
Line frequency changes.If unit maximum running frequency is 60Hz, then for single screw compressor, when unit operation to 60Hz
When, its exhaust noise fundamental frequency is 360Hz, and when unit operation is to 50Hz, its exhaust noise fundamental frequency is 300Hz, when unit is less than
When 50Hz is run, its load reduction, equipment acoustic noise also reduces more, and therefore, the exhaust that the frequency converter sets need effectively to cut down is made an uproar
Sound base frequency range is 300Hz ~ 360Hz.For single air inlet interpolation muffler pipe, the noise elimination bandwidth of its fundamental frequency generally only has 30Hz left
The right side,
This single air inlet interpolation pipe design obviously can not effectively cut down 300Hz exhaust fundamental frequency noise.And the utility model
Using orifice plate by a noise elimination cavity be divided into two series connection noise elimination cavities, each individually designed air inlet interpolation pipe of noise elimination cavity so that
Two Helmholtz resonators with different frequency of noise elimination are connected into a silencer, and compact-sized.This practicality is new
The noise elimination curve of the noise elimination curve comparison list air inlet interpolation muffler pipe of type, it is obvious that the utility model is to 300Hz ~ 360Hz
Interior exhaust fundamental frequency noise can effectively be cut down.
Brief description of the drawings
Fig. 1 is the section structure diagram of the utility model silencer one embodiment；
Fig. 2 is air inlet interpolation pipe structural representation in Fig. 1；Reference is as follows in the embodiment：1-air inlet pipe, 2-disappear
Sound device housing, 2.1-increaser, 2.2-straight tube, 2.3-reducing pipe, 2.4-silencer cavity, 3-escape pipe, 4-air inlet
Interpolation pipe, 5-air inlet interpolation pipe stomata.
Fig. 3 is schematic view of the mounting position of the utility model silencer in screw unit；Accompanying drawing mark in the embodiment
Note is as follows:1-air inlet pipe, 2-suppressor case, 3-escape pipe, 6-compressor, 6.1-exhaust outlet of compressor, 6.2 compressions
Machine air entry, 7-blast pipe, 8-condenser, 9-choke valve, 10-evaporator；
Fig. 4 is the section structure diagram of another embodiment of this silencer;Reference is as follows in the embodiment: 1—
Air inlet pipe, 2-suppressor case, 2.1-increaser, 2.2-straight tube, 2.3-reducing pipe, 2.4-silencer cavity, 3-go out
Tracheae, 14-outlet interpolation pipe, 14.1-outlet interpolation pipe stomata；
Fig. 5 is the section structure diagram of the utility model silencer further embodiment；Reference in the embodiment
It is as follows：
1-air inlet pipe, 2-suppressor case, 2.1-increaser, 2.2-straight tube, 2.3-reducing pipe, 3-escape pipe,
4-air inlet interpolation pipe, 5-air inlet interpolation pipe stomata, 11-orifice plate, 11.1-orifice plate stomata, 12-intake noise reduction chamber, 13-go out
Gas noise elimination cavity, 14-outlet interpolation pipe, 14.1-outlet interpolation pipe stomata.
Fig. 6 is the noise elimination curve of embodiment 1.
Fig. 7 is the noise elimination curve of embodiment 3.
Fig. 8 is three embodiment interpolation pipes of the utility model pressure loss corresponding with air inlet pipe or escape pipe diameter ratio
Tendency chart.
Fig. 9 is the interpolation length of tube of the utility model embodiment one noise transmission loss corresponding with shell length proportionality coefficient
Design sketch.
In all above accompanying drawing, identical reference is used for representing identical element or structure.
Embodiment
In order that the purpose of this utility model, technical scheme and advantage are more clearly understood, below in conjunction with accompanying drawing and implementation
Example, the utility model is further elaborated.Specific embodiment described herein is only explaining that this practicality is new
Type, it is not used to limit the utility model.In addition, involved by each embodiment of the utility model disclosed below
As long as technical characteristic does not form conflict each other, can be combined with each other.
Embodiment 1：
As Figure 1-3 be used for screw unit exhaust silencer, by air inlet pipe 1, suppressor case 2, escape pipe 3,
Air inlet interpolation pipe 4, air inlet interpolation pipe stomata 5 form.The air inlet pipe 1 is relative from both ends respectively with escape pipe 3 and and silencer
The both ends of housing 2 each communicate with, and the connection of above-mentioned signified air inlet pipe 1, escape pipe 3 and suppressor case 2 refers to air inlet pipe 1
It is respectively fixedly connected with escape pipe 3 on suppressor case 2, junction sealing.Suppressor case 2 is by refrigerant flow direction by gradually
Expander 2.1, straight tube 2.2, reducing pipe 2.3 form；Air inlet interpolation pipe 4 is disposed with the suppressor case 2, the air inlet interpolation pipe
4 are fixed on increaser 2.1, and air inlet interpolation pipe 4 with the junction of increaser 2.1 by inserting in silencer cavity 2.4；Air inlet interpolation
Pipe 4 offers air inlet interpolation pipe stomata 5.
The internal diameter of the air inlet pipe 1 is 50mm ~ 450mm, and the internal diameter of the escape pipe 3 is more than or equal to the internal diameter of air inlet pipe 1,
The ratio of wherein air inlet bore and outlet bore is 0.6 ~ 1.
The suppressor case 2 is made up of increaser 2.1, straight tube 2.2, reducing pipe 2.3, wherein increaser 2.1 and air inlet
Pipe 1 is fixedly connected, and junction sealing, reducing pipe 2.3 is fixedly connected with escape pipe 3, junction sealing, increaser 2.1 and tapered
The shape of pipe 2.3 can be with inconsistent.The internal diameter of straight tube 2.2 is bigger than the internal diameter of air inlet pipe 1, the internal diameter of straight tube 2.2 and the internal diameter of air inlet pipe 1
Ratio is 1.1 ~ 3, and the total length of suppressor case 2 is 1.5 ~ 6 with the ratio of the internal diameter of air inlet pipe 1.
In addition, typically in order to it is attractive in appearance and it is convenient make, preferably the centre of gyration of suppressor case 2 and air inlet pipe 1 and go out
The centre of gyration of tracheae 3 overlaps, and the interpolation pipe centre of gyration overlaps with the centre of gyration of suppressor case.This center superposition is set
It is less big on erasure effect influence, it is misaligned to nor affect on erasure effect of the present utility model.The coincidence simultaneously is to weigh in theory
Close, it is allowed to which error is present in the zone of reasonableness in installation or welding.
In the utility model, the air inlet interpolation pipe 4 is fixed on increaser 2.1, the outer circumference surface end of air inlet interpolation pipe 4
The inner peripheral surface of first circle and increaser 2.1 is tightly connected.In Fig. 8 and table 1, air inlet interpolation pipe is corresponding with air inlet bore ratio
Pressure loss trend explanation：Air inlet interpolation pipe 4 is identical or bigger than air inlet bore with the internal diameter of air inlet pipe 1, as long as i.e. interpolation pipe
It is more than or equal to 1 with the ratio of air inlet pipe, silencer is along stroke pressure loss and local pressure loss effect with regard to fine.Thus interpolation pipe
It can be carried out in the larger context preferably, such as 1-2,1-1.5 with the scope of the internal diameter ratio of air inlet pipe.Due in air inlet
Be intubated 4 internal diameters and be more than or equal to the internal diameter of air inlet pipe 1, thus refrigerant from air inlet pipe 1 flow to air inlet interpolation pipe 4 when flow velocity will not rise
Height, so as to which silencer be greatly reduced along stroke pressure loss and local pressure loss.
The interpolation pipe of table 1 pressure loss Trends Sheet corresponding with air inlet pipe or outlet bore ratio
| Proportionality coefficient | The pressure loss (kpa) |
| 0.8 | 10.784 |
| 0.85 | 7.573 |
| 0.9 | 3.59 |
| 0.95 | 1.681 |
| 1 | 0.62 |
| 1.1 | 0.386 |
| 1.2 | 0.3 |
| 1.3 | 0.291 |
| 1.4 | 0.282 |
| 1.5 | 0.384 |
| 2 | 0.331 |
| 2.5 | 0.295 |
| 2.9 | 0.283 |
Through hole type stomata 5,5 a diameter of 5mm ~ 35mm of stomata are offered on the 4 circumferential wall of air inlet interpolation pipe, number is
1 ~ 20.
Combination rotary space inside suppressor case 2 is silencer cavity 2.4；As shown in Fig. 9 and table 2, work as muffler
Shell length is 405mm, and the number of openings is 4 on interpolation pipe, when open pore size is 20mm on interpolation pipe, interpolation length of tube and shell
Loss effect trend explanation is transmitted corresponding to body length proportionality coefficient：When interpolation length of tube and shell length proportionality coefficient are 0.33
When, noise transmission loss is maximum, and effect is optimal.Because noise transmission loss remove with interpolation length of tube and suppressor case length than
Proportionality coefficient has outside the Pass, also relevant with interpolation pipe the number of openings and aperture, through test of many times and sunykatuib analysis, air inlet interpolation pipe 4
Length and the total length of suppressor case 2 ratio preferably 0.1 ~ 0.8.
Table 2 transmits loss corresponding table
| Proportionality coefficient | Transmit loss（dB） |
| 0.1 | 0.3 |
| 0.2 | 0.9 |
| 0.3 | 8.2 |
| 0.33 | 47 |
| 0.35 | 8.3 |
| 0.4 | 3.4 |
| 0.5 | 1.2 |
| 0.6 | 0.9 |
| 0.7 | 1 |
| 0.8 | 0.7 |
In the utility model, air inlet interpolation pipe 4, air inlet interpolation pipe stomata 5 and silencer cavity 2.4 form Helmholtz
Resonator, make to be absorbed by silencer cavity 2.4 with Helmholtz resonator frequency identical noise, made an uproar so as to reduce the frequency
Sound.
In use, by the utility model be arranged on screw cold water source pump in compressor 6 exhaust outlet 6.1 or with pressure
On the blast pipe 7 that contracting machine exhaust outlet 6.1 is connected, for reducing the noise of unit.As shown in figure 3, the unit is also including suitable
Condenser 8, choke valve 9, the evaporator 10 of secondary connection.
Embodiment 2：
It is used for the exhaust silencer of screw unit as in Figure 2-4, identical with the structure of embodiment 1, difference is
Interpolation pipe is set in the reducing pipe 2.3 at gas end.After the present embodiment structure, only retain Helmholtz resonance cavity structure of airtight, omit
Various diaphragm structure cans obtain and the identical soundproof effect of the patent No. 201520276726.8.The pressure loss of the embodiment
Trend also corresponds to Fig. 8 and table 1, and content corresponding to the pressure loss is in chart：Interpolation bore is identical with outlet bore
It is or bigger than outlet bore.
Embodiment 3：
It is used for the exhaust silencer of screw unit as shown in Fig. 2,3,5, is added on the basis of embodiment 1 in outlet
Intubation 14, also adds orifice plate 11 between air inlet interpolation pipe 4 and outlet interpolation pipe 14 accordingly.Remaining is same with embodiment 1.
Specifically, such as Fig. 2,3,5, this be used for the exhaust silencer of screw unit by air inlet pipe 1, suppressor case 2,
Escape pipe 3, air inlet interpolation pipe 4, orifice plate 11, outlet interpolation pipe 14 form.The air inlet pipe 1 is with escape pipe 3 respectively from both ends phase
Pair and each communicated with the both ends of suppressor case 2, the connection of above-mentioned signified air inlet pipe 1, escape pipe 3 and suppressor case 2
Refer to that air inlet pipe 1 and escape pipe 3 are respectively fixedly connected with suppressor case 2, junction sealing.Suppressor case 2 is by cold
Matchmaker flow direction is made up of increaser 2.1, straight tube 2.2, reducing pipe 2.3；Air inlet interpolation pipe is disposed with the suppressor case 2
4, the air inlet interpolation pipe 4 is fixed on increaser 2.1, and air inlet interpolation pipe 4 with the junction of increaser 2.1 by inserting intake noise reduction chamber
In 12；Air inlet interpolation pipe 4 offers stomata 5.Outlet interpolation pipe 14 is disposed with the suppressor case 2, the outlet interpolation pipe
14 are fixed on reducing pipe 2.3, and outlet interpolation pipe 14 with the junction of reducing pipe 2.3 by inserting in outlet noise elimination cavity 13；In outlet
Intubation 14 offers outlet interpolation pipe stomata 14.1.Arrangement abacus 11, orifice plate 11 are fixed on straight tube in the suppressor case 2
On 2.2, the outer circumference surface of orifice plate 11 is tightly connected with the inner peripheral surface of straight tube 2.2, and the preferably center of orifice plate 11 offers through hole profiled orifice plate
Stomata 11.1.In the utility model, silencer is divided into intake noise reduction chamber 12 and outlet noise elimination cavity 13 by the orifice plate 11, two
Noise elimination cavity forms series connection.
The internal diameter of the air inlet pipe 1 is 50mm ~ 450mm, and the internal diameter of the escape pipe 3 is more than or equal to the internal diameter of air inlet pipe 1,
The ratio of wherein air inlet bore and outlet bore is 0.6 ~ 1.
The suppressor case 2 is made up of increaser 2.1, straight tube 2.2, reducing pipe 2.3, wherein increaser 2.1 and air inlet
Pipe 1 is fixedly connected, and junction sealing, reducing pipe 2.3 is fixedly connected with escape pipe 3, junction sealing, increaser 2.1 and tapered
The shape of pipe 2.3 can be with inconsistent.The internal diameter of straight tube 2.2 is bigger than the internal diameter of air inlet pipe 1, the internal diameter of straight tube 2.2 and the internal diameter of air inlet pipe 1
Ratio is 1.1 ~ 3, and the total length of suppressor case 2 is 1.5 ~ 6 with the ratio of the internal diameter of air inlet pipe 1.
In the utility model, the air inlet interpolation pipe 4 is fixed on increaser 2.1, the outer circumference surface end of air inlet interpolation pipe 4
The inner peripheral surface of first circle and increaser 2.1 is tightly connected.
In the utility model, the outlet interpolation pipe 14 is fixed on reducing pipe 2.3, the outer circumference surface of outlet interpolation pipe 14
Termination one is enclosed to be tightly connected with the inner peripheral surface of reducing pipe 2.3.The internal diameter of the outlet interpolation pipe 14 is more than or equal to escape pipe 3
Internal diameter.The internal diameter of the air inlet interpolation pipe 4 is more than or equal to the internal diameter of air inlet pipe 1.This point and the pressure loss in Fig. 8 and table 1
Trend describes corresponding.
Because the internal diameter of air inlet interpolation pipe 4 and outlet interpolation pipe 14 is more than or equal to the internal diameter of air inlet pipe 1, therefore refrigerant is from entering
Flow velocity will not raise when tracheae 1 flow to air inlet interpolation pipe 4 and outlet interpolation pipe 14, so as to which silencer be greatly reduced along stroke pressure
Loss and local pressure loss.
The He of through hole type air inlet interpolation pipe stomata 5 is offered on the 14 circumferential wall of air inlet interpolation pipe 4 and outlet interpolation pipe
Outlet interpolation pipe stomata 14.1,14.1 a diameter of 5mm ~ 35mm of air inlet interpolation pipe stomata 5 and outlet interpolation pipe stomata, number be 1 ~
20.
In addition, typically in order to it is attractive in appearance and it is convenient make, preferably the centre of gyration of suppressor case 2 and air inlet pipe 1 and go out
The centre of gyration of tracheae 3 overlaps.The interpolation pipe centre of gyration overlaps with the centre of gyration of suppressor case.This center superposition is set
It is less big on erasure effect influence, it is misaligned to nor affect on erasure effect of the present utility model.The coincidence simultaneously is to weigh in theory
Close, it is allowed to which error is present in the zone of reasonableness in installation or welding.
In the utility model, air inlet interpolation pipe 4, air inlet interpolation pipe stomata 5 and intake noise reduction chamber 12 form air inlet side hertz
Mu Huozi resonators；Outlet interpolation pipe 14, outlet interpolation pipe stomata 14.1 and outlet noise elimination cavity 13 form outlet side Helmholtz
The frequency of noise elimination of resonator, air inlet side Helmholtz resonator and outlet side Helmholtz resonator is different, makes and Helmholtz
Resonator frequency identical noise is absorbed by intake noise reduction chamber 12 and outlet noise elimination cavity 13 respectively, is made an uproar so as to reduce different frequency
Sound.
In use, by the utility model be arranged on screw cold water source pump in compressor 6 exhaust outlet 6.1 or with pressure
On the blast pipe 7 that contracting machine exhaust outlet 6.1 is connected, for reducing the noise of unit.As shown in figure 3, the unit is also including suitable
Condenser 8, choke valve 9, the evaporator 10 of secondary connection.
Relative to prior art, the utility model has the advantages that：
（1）The internal diameter of stomata is identical with air inlet bore or bigger than air inlet bore on air inlet interpolation pipe and orifice plate, so as to
Make air-flow from air inlet pipe be flowed into air inlet interpolation pipe when, flow velocity is constant or diminishes.Formula is lost according to along stroke pressure, when caliber increases
Greatly, flow velocity reduces, and when other parameters are constant, being lost along stroke pressure for turbulent flow reduces.Equally, flow velocity reduces, and other parameters are constant
When, the local pressure loss of turbulent flow also reduces, therefore uses the not increased design of this air velocity, and pipeline can be greatly reduced
Along stroke pressure loss and local pressure loss.
（2）It is simple in construction, reach noise elimination demand only with Helmholtz resonator.Due to the exhaust noise fundamental frequency of screw machine
Equal to the meshing frequency of screw rod, the general positive screw rod number of teeth is 4, and single screw rod spiral slot number is 6, therefore is compressed frequently surely for 60Hz
Machine, ignore the revolutional slip of motor, then the exhaust noise frequency of double-screw compressor is 240Hz and its harmonic wave；Single screw compressor
Exhaust noise frequency be 360Hz and its harmonic wave.Again because refrigeration screw compressor belongs to fuel injection helical lobe compressor, its noise figure
Higher frequency is typically fundamental frequency or its 2 times, 3 subharmonic.The particularly high unit of distributive value, its fundamental frequency noise is often highest
, therefore only need during muffler desing targetedly to eliminate Middle and low frequency noise can and meet design requirement.And adopt
After the utility model structure, only retain Helmholtz resonance cavity structure of airtight, omit various diaphragm structure cans acquirements and patent
Number 201520276726.8 identical soundproof effects, embodiment 1 and embodiment 2 of the present utility model.
（3）The exhaust noise fundamental frequency of frequency conversion screw unit is also the meshing frequency of screw rod, the fortune of its meshing frequency random groups
Line frequency changes.If unit maximum running frequency is 60Hz, then for single screw compressor, when unit operation to 60Hz
When, its exhaust noise fundamental frequency is 360Hz, and when unit operation is to 50Hz, its exhaust noise fundamental frequency is 300Hz, when unit is less than
When 50Hz is run, its load reduction, equipment acoustic noise also reduces more, and therefore, the exhaust that the frequency converter sets need effectively to cut down is made an uproar
Sound base frequency range is 300Hz ~ 360Hz.For single air inlet interpolation muffler pipe, the noise elimination bandwidth of its fundamental frequency generally only has 30Hz left
The right side, as shown in figure 5, transverse axis is frequency（Unit is Hz）, the longitudinal axis is noise losses（Unit is dB）, the silencer crest frequency
It is designed as 360Hz.This single air inlet interpolation pipe design obviously can not effectively cut down 300Hz exhaust fundamental frequency noise.
And a noise elimination cavity is divided into the noise elimination cavity of two series connection using orifice plate by the utility model, each noise elimination cavity is individually set
Air inlet interpolation pipe is counted, so that two with different frequency of noise elimination Helmholtz resonators are connected into a silencer, and
It is compact-sized.Noise elimination curve of the present utility model is as shown in fig. 7, transverse axis is frequency（Unit is Hz）, the longitudinal axis is noise losses（It is single
Position is dB）.
The noise elimination curve of single air inlet interpolation muffler pipe in comparison diagram 5, it is obvious that the utility model is corresponding with embodiment 3
Fig. 7 in the exhaust fundamental frequency noise in 300Hz ~ 360Hz can effectively be cut down.
（4）The utility model reduces pressure fluctuation using the expansion chamber in suppressor case, utilizes perforate air inlet interpolation pipe
The Helmholtz resonator of formation reduces noise.Because air inlet interpolation bore is more than or equal to air inlet bore, therefore refrigerant
Flow velocity will not raise when flowing to air inlet interpolation pipe from air inlet pipe, so as to which silencer be greatly reduced along stroke pressure loss and local pressure
Power is lost.Compared with the silencer of the patent No. 201520276726.8, the utility model is eliminated the noise on the premise of sound deadening capacity is ensured
The device pressure loss is smaller, and structure is simpler.And it is further, noise elimination cavity is divided into the noise elimination cavity of two series connection by orifice plate,
Silencer is set to be applied to the frequency conversion screw unit of exhaust noise frequency random groups running frequency change.
Preferred embodiment of the present utility model is the foregoing is only, it is all in this practicality not to limit the utility model
All any modification, equivalent and improvement made within new spirit and principle etc., are all contained in protection of the present utility model
Within the scope of.
Claims (12)
1. a kind of exhaust silencer for screw unit, including the sequentially air inlet pipe of straight line connection, suppressor case, outlet
Pipe；Suppressor case is made up of by refrigerant flow direction increaser, straight tube, reducing pipe, and that is sequentially combined in suppressor case returns
It is silencer cavity to turn space；It is characterized in that：Fixed setting one in one of them at least in increaser and reducing pipe
Interpolation pipe；Interpolation pipe with increaser or reducing pipe junction by inserting in silencer cavity；Through hole is offered on interpolation tube wall
Type stomata.
2. the exhaust silencer according to claim 1 for screw unit, it is characterised in that：When in increaser and gradually
When an interpolation pipe is respectively set in the draw, two interpolation pipes are mutually not in contact with each other, and orifice plate is fixedly installed in straight tube, and orifice plate will disappear
Sound device cavity is divided into the noise elimination cavity of two series connection.
3. the exhaust silencer according to claim 1 for screw unit, it is characterised in that：The air inlet pipe, go out
Tracheae is fixedly connected on suppressor case respectively, junction sealing；The outer circumference surface of interpolation pipe one end and increaser or tapered
The inner peripheral surface of pipe is tightly connected.
4. the exhaust silencer according to claim 2 for screw unit, it is characterised in that：The orifice plate it is cylindrical
The inner peripheral surface of side face and straight tube is tightly connected, and a through hole shape stomata is opened up on the orifice plate.
5. the exhaust silencer according to claim 2 for screw unit, it is characterised in that：The stomata of the orifice plate
Aperture is identical with air inlet bore or bigger than air inlet bore.
6. the exhaust silencer according to claim 1 for screw unit, it is characterised in that：When in increaser and gradually
When an interpolation pipe is respectively set in the draw, two interpolation length of tube are unequal.
7. the exhaust silencer according to claim 1 for screw unit, it is characterised in that：The interpolation length of tube
Ratio with suppressor case total length is 0.1 ~ 0.8.
8. the exhaust silencer according to claim 1 for screw unit, it is characterised in that：Each interpolation bore etc.
In or more than respective place air inlet pipe or outlet bore.
9. the exhaust silencer according to claim 1 for screw unit, it is characterised in that：The air inlet pipe and go out
The internal diameter of tracheae is equal or different, and the internal diameter ratio of air inlet pipe and escape pipe is 0.6 ~ 1.
10. the exhaust silencer according to claim 1 for screw unit, it is characterised in that：The silencer shell
The straight tube internal diameter of body is bigger than air inlet bore, and straight tube internal diameter is 1.1 ~ 3 with air inlet bore ratio；The suppressor case length with
The ratio of air inlet pipe diameter is 1.5 ~ 6.
11. the exhaust silencer according to claim 1 for screw unit, it is characterised in that：Interpolation pipe stomata is straight
Footpath is 5mm ~ 35mm, and interpolation pipe stoma number is 1 ~ 20.
12. the exhaust silencer according to claim 1 for screw unit, it is characterised in that：Silencer is arranged on
In screw-type water chiller or source pump, the exhaust outlet of compressor in the unit is set or is connected with exhaust outlet of compressor
On blast pipe.
Applications Claiming Priority (4)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN2017204634518 | 2017-04-28 | ||
| CN201720463451 | 2017-04-28 | ||
| CN201710293276 | 2017-04-28 | ||
| CN2017102932767 | 2017-04-28 |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN206957931U true CN206957931U (en) | 2018-02-02 |
Family
ID=59719627
Family Applications (2)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201720757593.5U Active CN206957931U (en) | 2017-04-28 | 2017-06-27 | A kind of exhaust silencer for screw unit |
| CN201710501996.8A Active CN107120288B (en) | 2017-04-28 | 2017-06-27 | Exhaust silencer for screw type unit |
Family Applications After (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201710501996.8A Active CN107120288B (en) | 2017-04-28 | 2017-06-27 | Exhaust silencer for screw type unit |
Country Status (1)
| Country | Link |
|---|---|
| CN (2) | CN206957931U (en) |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN107120288A (en) * | 2017-04-28 | 2017-09-01 | 麦克维尔空调制冷(武汉)有限公司 | A kind of exhaust silencer for screw unit |
Families Citing this family (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN107989775B (en) * | 2018-01-05 | 2023-11-24 | 安徽美芝制冷设备有限公司 | Muffler for compressor and compressor |
| CN109489285A (en) * | 2018-11-22 | 2019-03-19 | 青岛海尔空调电子有限公司 | Air conditioner |
| DE102019123902A1 (en) * | 2019-09-05 | 2021-03-11 | Hanon Systems | Device for damping pressure pulsations for a compressor of a gaseous fluid |
| CN114576168A (en) * | 2020-11-30 | 2022-06-03 | 复盛实业(上海)有限公司 | Compressor body |
| CN113294337B (en) * | 2021-05-25 | 2024-01-23 | 世晃(上海)机电工业有限公司 | Screw air compressor |
Family Cites Families (10)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US5706850A (en) * | 1996-11-19 | 1998-01-13 | Carrier Corporation | Oil diffuser |
| KR20010054066A (en) * | 1999-12-03 | 2001-07-02 | 구자홍 | welding structure of discharge pipe for hermetic compressor |
| CN2682211Y (en) * | 2004-02-23 | 2005-03-02 | 王浩国 | Silencer for perforated pipe |
| CN1779267A (en) * | 2004-11-17 | 2006-05-31 | 彭建华 | Exhaust silencer of compressor for refrigerator and air conditioner |
| KR20070025726A (en) * | 2005-09-05 | 2007-03-08 | 삼성전자주식회사 | Refrigerator |
| JP2011012869A (en) * | 2009-07-01 | 2011-01-20 | Panasonic Corp | Air conditioner |
| BR102012026728A2 (en) * | 2012-10-18 | 2014-08-26 | Whirlpool Sa | EXPANSION CHAMBER FOR ALTERNATIVE COMPRESSOR UNLOADING LINE |
| CN204006603U (en) * | 2014-05-06 | 2014-12-10 | 新昌县行峰制冷有限公司 | A kind of air conditioner muffler |
| CN204677259U (en) * | 2015-04-29 | 2015-09-30 | 麦克维尔空调制冷(武汉)有限公司 | A kind of exhaust silencer for screw type unit |
| CN206957931U (en) * | 2017-04-28 | 2018-02-02 | 麦克维尔空调制冷(武汉)有限公司 | A kind of exhaust silencer for screw unit |
-
2017
- 2017-06-27 CN CN201720757593.5U patent/CN206957931U/en active Active
- 2017-06-27 CN CN201710501996.8A patent/CN107120288B/en active Active
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN107120288A (en) * | 2017-04-28 | 2017-09-01 | 麦克维尔空调制冷(武汉)有限公司 | A kind of exhaust silencer for screw unit |
| CN107120288B (en) * | 2017-04-28 | 2022-05-20 | 麦克维尔空调制冷(武汉)有限公司 | Exhaust silencer for screw type unit |
Also Published As
| Publication number | Publication date |
|---|---|
| CN107120288B (en) | 2022-05-20 |
| CN107120288A (en) | 2017-09-01 |
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