CN210371104U - Exhaust filter of compressor - Google Patents
Exhaust filter of compressor Download PDFInfo
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- CN210371104U CN210371104U CN201920814684.7U CN201920814684U CN210371104U CN 210371104 U CN210371104 U CN 210371104U CN 201920814684 U CN201920814684 U CN 201920814684U CN 210371104 U CN210371104 U CN 210371104U
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Abstract
The utility model discloses a compressor exhaust filter, which comprises a shell, wherein a clapboard which divides the shell into a first anechoic chamber and a second anechoic chamber is arranged in the shell; one end of the shell is provided with an inlet pipe for communicating the first muffling chamber with a coil pipe of the compressor, and the other end of the shell is provided with an outlet pipe for communicating the second muffling chamber with the coil pipe of the compressor; a hollow pipe of the connector is arranged on the partition plate, one end of the hollow pipe of the connector extends into the first silencing chamber, and the other end of the hollow pipe of the connector extends into the second silencing chamber; one end of the hollow pipe of the communicating device positioned in the second silencing chamber is provided with a silencing hole, the end part of the end is closed, and the area of the single silencing hole is smaller than the sectional area of the closed end of the hollow pipe of the communicating device; the utility model discloses can effectively reduce compressor wide band noise and spouting noise, realize the exhaust noise elimination of compressor.
Description
Technical Field
The utility model belongs to the technical field of the compressor falls makes an uproar, concretely relates to compressor exhaust filter and noise elimination method thereof.
Background
In the exhaust filter for compressor of the prior art, as disclosed in utility model patent No. 201620041828.6, 8/17/2016, the technology of "exhaust filter for compressor" is disclosed, which consists of a casing, a cover, an inlet pipe and an outlet pipe extending into the interior, and an intermediate pipe for two chambers, and which, although capable of eliminating a certain noise, lacks recognition of the characteristics of the exhaust noise. Meanwhile, due to the characteristic amplitude-frequency characteristic of the exhaust noise, when the gas passes through the exhaust valve of the compressor, the motion process of the gas is similar to gas small-hole jet flow, the process of exhausting the gas flow out of the cylinder belongs to an injection process, and the injection noise is easily caused in the exhaust process due to the existence of an injection phenomenon. Meanwhile, the exhaust noise of the compressor is broadband noise, and the noise value becomes large when the pressure of the inlet exhaust hole is large, so that the silencing capability of the existing exhaust filter of the compressor is limited.
SUMMERY OF THE UTILITY MODEL
The utility model aims to overcome prior art's not enough, provide the compressor exhaust filter that can effectively reduce compressor wide band noise and spouting noise and noise elimination method thereof.
In order to realize the purpose, the utility model discloses a technical scheme be:
the exhaust filter of the compressor comprises a shell, wherein a partition plate for dividing the shell into a first silencing chamber and a second silencing chamber is arranged in the shell; one end of the shell is provided with an inlet pipe for communicating the first muffling chamber with a coil pipe of the compressor, and the other end of the shell is provided with an outlet pipe for communicating the second muffling chamber with the coil pipe of the compressor; a hollow pipe of the connector is arranged on the partition plate, one end of the hollow pipe of the connector extends into the first silencing chamber, and the other end of the hollow pipe of the connector extends into the second silencing chamber; one end of the hollow pipe of the communicating device positioned in the second silencing chamber is provided with a silencing hole, the end part of the end is closed, and the area of the single silencing hole is smaller than the sectional area of the closed end of the hollow pipe of the communicating device.
The partition plate is provided with an insertion pipe, one end of the insertion pipe is located in the first silencing chamber, the other end of the insertion pipe is located in the second silencing chamber, and the end portion, located in the second silencing chamber, of the insertion pipe is closed.
The silencing holes are distributed on the hollow pipe of the communicating device in an annular shape, and more than one group of silencing holes are formed.
The aperture of the silencing hole is phi 0.7-1.2 mm.
The distance between the adjacent silencing holes is 3.5-10 times of the aperture of each silencing hole.
The sum of the areas of the silencing holes is 20-60% larger than the sectional area of the closed end of the hollow tube of the communicating vessel.
The number of the silencing holes of the hollow pipe of the communicating vessel is
D is the aperture of the hollow tube of the connector, D is the aperture of the silencing holes, and n is the number of the silencing holes.
The length L of the insertion pipe is lambda/4, wherein L is the length of the insertion pipe, and lambda is the wavelength of the sound attenuation band.
The utility model has the advantages that: aiming at the jet noise of the special broadband noise of the exhaust noise, the utility model adopts the muffling hole with the area smaller than the sectional area of the hollow tube of the communicating device, thereby not only reducing the exhaust sound power and moving the audio frequency amplitude characteristic to the insensitive high-frequency movement of human ears, but also ensuring the normal exhaust flow; the real low noise of the compressor is realized, and the requirement of a user on the low noise of the compressor is met.
Aiming at the low-frequency sound in the special broadband noise of the exhaust noise, the utility model utilizes the sound wave reflection of a special wave tube to exactly and completely or partially offset the incident sound wave and the reflected sound wave, thereby reducing the exhaust noise of the compressor; the real low noise of the compressor is realized, and the requirement of a user on the low noise of the compressor is met.
The utility model discloses under the good condition of compressor exhaust filter noise elimination effect, constitute noise eliminator through coil pipe and filter, can reach and form the same effect of multistage noise elimination through processing the chamber of eliminating noise sealed on the cylinder block. By adopting the compressor exhaust filter, the cylinder seat can be prevented from being provided with the anechoic chamber, the volume of the cylinder seat is reduced, the machining is reduced, the defects that the geometric shape is limited, and the requirement of an assembly process is increased when parts such as a gasket, a cover plate, a screw and the like are required to form the anechoic chamber sealed cavity are overcome, and the energy and the material are saved.
Drawings
The contents of the various figures of the specification and the labels in the figures are briefly described as follows:
fig. 1 is a schematic structural diagram of the compressor exhaust filter of the present invention.
Fig. 2 is a schematic cross-sectional view of the discharge filter of the compressor of fig. 1.
Fig. 3 is a schematic structural diagram of a modified version of the compressor exhaust filter of the present invention.
The labels in the above figures are:
1. the pipe comprises a pipe inlet 2, a first muffling chamber 3, a partition plate 4, a hollow pipe of a communicating vessel 5, a second muffling chamber 6, a pipe outlet 7, muffling holes 8, a coil pipe 9, an insertion pipe 10 and a shell.
Detailed Description
The following description of the preferred embodiments of the present invention will be made in further detail with reference to the accompanying drawings.
The direction of the arrows in the drawings indicates the direction of refrigerant flow.
As shown in fig. 1-2, the compressor exhaust filter comprises a shell 10, and a partition plate 3 for dividing the shell 10 into a first silencing chamber 2 and a second silencing chamber 5 is arranged inside the shell 10; one end of the shell 10 is provided with an inlet pipe 1 for communicating the first muffling chamber 2 with a coil pipe 8 of the compressor, and the other end of the shell 10 is provided with an outlet pipe 6 for communicating the second muffling chamber 5 with the coil pipe 8 of the compressor; a hollow pipe 4 of the communicating device is arranged on the partition plate 3, one end of the hollow pipe 4 of the communicating device extends into the first silencing chamber 2, and the other end of the hollow pipe 4 of the communicating device extends into the second silencing chamber 5; one end of the hollow pipe 4 of the communicating device positioned in the second silencing chamber 5 is provided with a silencing hole 7, the end part of the end is closed, and the area of the single silencing hole 7 is smaller than the sectional area of the closed end of the hollow pipe 4 of the communicating device.
The exhaust gas of the compressor enters the first muffling chamber 2 through the coil pipe 8 and the inlet pipe 1 for muffling, then enters the second muffling chamber 5 through the hollow pipe 4 of the communicating device, and is discharged after entering the coil pipe 8 through the outlet pipe 6 after being muffled in the second muffling chamber 5. The exhaust of the compressor is silenced by the first silencing chamber 2 and the second silencing chamber 5, and then the exhaust silencing of the compressor is realized.
The end part of one end of the hollow pipe 4 of the communicating device, which is positioned in the second anechoic chamber 5, is closed, and an anechoic hole 7 is arranged at the end, the area of a single anechoic hole 7 is smaller than the sectional area of the closed end of the hollow pipe 4 of the communicating device, the anechoic hole 7 reduces the acoustic power of each frequency doubling band after weighting, meanwhile, the frequency doubling band can be pushed to a higher human ear insensitivity range, the subjective feeling of the human ear to noise is reduced, under the condition that the flow is kept equal or even slightly larger than the original flow, a large hole is replaced by a plurality of anechoic holes 7, the A sound level is reduced, the broadband noise is reduced, and the impact noise of injection is eliminated.
The noise elimination principle of this scheme does:
the exhaust noise sound power formula is as follows:
w is acoustic power, Kv constant, ρ is refrigerant density, v is refrigerant velocity, D is orifice diameter, ρ0Is the density of air, c0Is the speed of sound.
The formula shows that the noise sound power is related to the diameter of the nozzle, the larger the diameter of the nozzle is, the higher the sound power is, the larger the sound speed is, the larger the noise is, the diameter D of the nozzle is reduced, the sound power after weighting of each frequency multiplier band is reduced, meanwhile, the frequency multiplier bands can be pushed to a higher insensitive range of human ears, and the subjective feeling of the human ears on the noise is reduced. Under the condition of keeping the flow equal and even slightly larger than the original flow, the large holes of the hollow pipe 4 of the communicating device are replaced by a large number of the silencing holes 7, the diameter of the nozzle of each silencing hole 7 is small, the sound level A is reduced, the broadband noise is reduced, and the impact noise of injection is eliminated. Meanwhile, as the refrigerant is sprayed to the next-stage section enlarged muffling chamber from the small muffling hole 7, the speed of the refrigerant is reduced, and the noise of the compressor is further reduced.
As a further improvement, as shown in fig. 3, a cannula 9 is provided on the partition plate 3, one end of the cannula 9 is located in the first muffling chamber 2, the other end of the cannula 9 is located in the second muffling chamber 5, and the end of the cannula 9 located in the second muffling chamber 5 is closed.
The noise elimination principle of this improvement scheme does: when the incident sound waves are transmitted to the end face of the insertion tube 9 with the closed outlet end, the closed section reflects the sound waves back, and when the incident sound waves reach the tube opening of the insertion tube 9, the reflected sound waves under certain frequencies are opposite to the incident sound waves of the first muffling chamber 2 in phase, so that a counteraction effect is generated, and noise is reduced; even though the incident sound waves and the reflected sound waves in adjacent frequency bands cannot be completely offset, the incident sound waves and the reflected sound waves have certain attenuation effect on the sound waves, the propagated sound waves are actually offset with each other before and after being superposed, and the sound waves are converted into heat energy through microscopic vortex motion to be absorbed, so that the noise is reduced.
The end of the insertion tube 9 located in the second muffling chamber 5 is closed, the length of the insertion tube 9 is designed according to a specific muffling frequency band, when the refrigerant is injected at a high speed, the injection noise is generated, the noise sound velocity c is f λ (λ is the sound wave wavelength, f is the noise frequency), the length L of the insertion tube 9 is (2n-1) λ/4, and when n is 1 and L is λ/4, that is, the length L of the insertion tube 9 is 1/4 times the sound wave wavelength λ, the length L of the insertion tube 9 is long for low-frequency sound with a long λ, and the length L of the insertion tube 9 is small for high-frequency sound with a short wavelength λ.
That is, the length of the insertion tube 9 is determined according to the noise elimination band, and the length L of the insertion tube 9 is (2n-1) λ/4, where L is the length of the insertion tube 9, n is the order of the sound wave, and λ is the wavelength of the noise elimination band. Preferably, n is 1 and L is λ/4, i.e. the length L of the tube 9 is 1/4 times the wavelength λ of the sound waves.
In addition to the hollow pipe 4 of the connector for increasing the noise reduction amount TL and the noise reduction hole 7 provided in the hollow pipe 4 of the connector, a cannula 9 is added to the first noise reduction chamber 2 and the second noise reduction chamber 5, the cannula 9 is a wavelength tube for a specific noise reduction frequency, and one end of the cannula 9 located in the second noise reduction chamber 5 is closed. In order to increase the sound transmission loss TL and reduce noise, the expansion ratio m of the first anechoic chamber 2 to the intubation tube 9 is increased, the expansion ratio m of the first anechoic chamber 2 to the intubation tube 9 is 4-10, and the anechoic effect is further improved.
The silencing holes 7 are annularly distributed on the hollow pipe 4 of the communicating device, and more than one group of silencing holes 7 are arranged. The aperture of the silencing hole 7 is smaller than that of the hollow pipe 4 of the communicating device, after the diameter of a nozzle of the silencing hole 7 is reduced, the flow of a single silencing hole 7 is reduced, therefore, more than one group of silencing holes 7 are designed, the silencing holes 7 are distributed in the radial direction and the axial direction of the hollow pipe 4 of the communicating device, the total area of the silencing holes 7 is larger than the sectional area of the hollow pipe 4 of the communicating device, and the best silencing effect is achieved while the flow is ensured.
The aperture of the silencing hole 7 is preferably phi 0.7-1.2 mm; the distance between the adjacent silencing holes 7 is 3.5-10 times of the aperture of each silencing hole 7; the sum of the areas of the silencing holes 7 is 20 to 60 percent larger than the sectional area of the closed end of the hollow tube 4 of the communicating vessel. According to the section of the hollow pipe 4 of the connector, the diameter of the nozzle of the silencing hole 7 is improved from phi 5-phi 7mm to phi 0.7-phi 1.2mm, so that the diameter of the nozzle is reduced by more than 7 times, and meanwhile, in order to avoid the situation that small nozzles are converged into a large nozzle again to cause noise reduction failure, the hole pitch of the small nozzles is set to be 8-12 mm, and the distance between the nozzles of the silencing hole 7 is set to be more than 8 times. After the diameter of a nozzle of the silencing hole 7 is reduced, the flow of a single silencing hole 7 is reduced, more than one group of silencing holes 7 are designed, the group of silencing holes 7 are distributed in the radial direction and the axial direction of the hollow pipe 4 of the communicating device, the total area of the group of small holes is 20% -60% larger than the sectional area of the original exhaust port, and the newly designed group of silencing holes 7 is guaranteed to be equivalent to or slightly larger than the flow of the hollow pipe 4 of the original communicating device.
Specifically, the number of the silencing holes 7 of the hollow tube 4 of the communicating vessel is
D is in the connectorThe aperture of the hollow tube 4, d the aperture of the silencing holes 7 and n the number of the silencing holes 7. The number of the silencing holes 7 is designed to realize that the total area of the silencing holes 7 is larger than the sectional area of the hollow pipe 4 of the communicating device, thereby achieving the best silencing effect.
The utility model discloses compressor exhaust filter's noise elimination principle does: the air flow enters the first silencing chamber 2 through the inlet pipe 1, is subjected to first-stage silencing, and then is diffused into the second silencing chamber 5 through the silencing hole 7 of the hollow pipe 4 of the communicating device, which is positioned in the second silencing chamber 5; on one hand, the sound-absorbing holes 7 reduce the sound power of each frequency doubling band, reduce the broadband noise and eliminate the impact noise of jetting; on the other hand, the refrigerant enters the plurality of muffling holes 7 having a reduced cross section, and is injected from the inside of the muffling holes 7 into the second muffling chamber 5 having an increased cross section, whereby the refrigerant velocity is reduced, the compressor noise is further reduced, and the compressor discharge muffling is realized.
As a further improved scheme, the sound elimination principle of the compressor exhaust filter is as follows: the air flow enters the first silencing chamber 2 through the inlet pipe 1, is subjected to first-stage silencing, and then is diffused into the second silencing chamber 5 through the silencing hole 7 of the hollow pipe 4 of the communicating device, which is positioned in the second silencing chamber 5; meanwhile, the air flow in the first muffling chamber 2 enters the inserting pipe 9, when sound waves are transmitted to the closed end of the inserting pipe 9, the sound waves are reflected back by the closed section, when the sound waves reach the pipe opening, the reflected sound waves and the incident sound waves are opposite in phase, the transmitted sound waves are actually offset with each other or partially before and after being superposed, the sound waves are converted into heat energy through microscopic vortex motion, the sound waves are absorbed, the noise is further reduced, and the exhaust muffling of the compressor is realized.
Specifically, the length of the insertion tube 9 may be designed according to a specific sound attenuation band, and the length L of the low-frequency sound with a long wavelength λ is long, and the length L of the high-frequency sound with a short wavelength λ is small. When the sound waves are transmitted to the cannula 9 with the closed outlet end, the closed cross section reflects the sound waves back, when the sound waves reach the tube opening, the reflected sound waves and the incident sound waves are opposite in phase, the transmitted sound waves are practically offset before and after being superposed, and the sound waves are converted into heat energy through microscopic vortex motion to be absorbed. In practice, when the inserting tube 9 is needed to be applied in the noise reduction process, firstly, the noise peak value, that is, the part to be weakened is found according to the simulated and actually measured noise curve, a proper sound transmission loss target value is set, and then, the length of the wavelength tube of the inserting tube 9 is set by combining the related calculation formula of the wavelength tube. By utilizing the sound wave reflection of the insertion pipe 9, the incident sound wave and the reflected sound wave are exactly and completely counteracted or reduced, the exhaust noise of the compressor is reduced, and the exhaust silencing effect is improved.
The utility model uses a plurality of silencing holes 7 to replace a big hole, which not only reduces the A sound level and the broadband noise, but also eliminates the impact noise of injection; the sound wave reflection of the insertion pipe 9 is utilized to exactly and completely offset the incident sound wave and the reflected sound wave or reduce the incident sound wave and the reflected sound wave, so that the exhaust noise of the compressor is further reduced, and the exhaust silencing effect is improved.
Obviously the specific implementation of the present invention is not limited by the above-mentioned manner, and various insubstantial improvements made by the method concept and technical solution of the present invention are all within the protection scope of the present invention.
Claims (8)
1. The compressor exhaust filter comprises a shell, wherein a partition plate for dividing the shell into a first silencing chamber and a second silencing chamber is arranged in the shell; one end of the shell is provided with an inlet pipe for communicating the first muffling chamber with a coil pipe of the compressor, and the other end of the shell is provided with an outlet pipe for communicating the second muffling chamber with the coil pipe of the compressor; the method is characterized in that: a hollow pipe of the connector is arranged on the partition plate, one end of the hollow pipe of the connector extends into the first silencing chamber, and the other end of the hollow pipe of the connector extends into the second silencing chamber; one end of the hollow pipe of the communicating device positioned in the second silencing chamber is provided with a silencing hole, the end part of the end is closed, and the area of the single silencing hole is smaller than the sectional area of the closed end of the hollow pipe of the communicating device.
2. The compressor discharge air filter of claim 1 wherein: the silencing holes are distributed on the hollow pipe of the communicating device in an annular shape, and more than one group of silencing holes are formed.
3. The compressor discharge air filter of claim 1 wherein: the aperture of the silencing hole is phi 0.7-1.2 mm.
4. The compressor discharge air filter of claim 1 wherein: the distance between the adjacent silencing holes is 3.5-10 times of the aperture of each silencing hole.
5. A compressor discharge air filter according to any one of claims 1 to 4 wherein: the sum of the areas of the silencing holes is 20-60% larger than the sectional area of the closed end of the hollow tube of the communicating vessel.
6. The compressor discharge air filter of claim 1 wherein: the number of the silencing holes of the hollow pipe of the communicating vessel is
D is the aperture of the hollow tube of the connector, D is the aperture of the silencing holes, and n is the number of the silencing holes.
7. The compressor discharge air filter of claim 1 wherein: the partition plate is provided with an insertion pipe, one end of the insertion pipe is located in the first silencing chamber, the other end of the insertion pipe is located in the second silencing chamber, and the end portion, located in the second silencing chamber, of the insertion pipe is closed.
8. The compressor discharge air filter of claim 7 wherein: the length L of the insertion pipe is lambda/4, wherein L is the length of the insertion pipe, and lambda is the wavelength of the sound attenuation band.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201920814684.7U CN210371104U (en) | 2019-05-31 | 2019-05-31 | Exhaust filter of compressor |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201920814684.7U CN210371104U (en) | 2019-05-31 | 2019-05-31 | Exhaust filter of compressor |
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| CN210371104U true CN210371104U (en) | 2020-04-21 |
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| CN201920814684.7U Active CN210371104U (en) | 2019-05-31 | 2019-05-31 | Exhaust filter of compressor |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN110145456A (en) * | 2019-05-31 | 2019-08-20 | 芜湖欧宝机电有限公司 | Compressor air-discharging filter and its sound reduction method |
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2019
- 2019-05-31 CN CN201920814684.7U patent/CN210371104U/en active Active
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN110145456A (en) * | 2019-05-31 | 2019-08-20 | 芜湖欧宝机电有限公司 | Compressor air-discharging filter and its sound reduction method |
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