CN111238019A - Refrigerating equipment - Google Patents
Refrigerating equipment Download PDFInfo
- Publication number
- CN111238019A CN111238019A CN202010140054.3A CN202010140054A CN111238019A CN 111238019 A CN111238019 A CN 111238019A CN 202010140054 A CN202010140054 A CN 202010140054A CN 111238019 A CN111238019 A CN 111238019A
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- Prior art keywords
- sound
- micro
- layer
- sound absorption
- perforated plate
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F24—HEATING; RANGES; VENTILATING
- F24F—AIR-CONDITIONING; AIR-HUMIDIFICATION; VENTILATION; USE OF AIR CURRENTS FOR SCREENING
- F24F13/00—Details common to, or for air-conditioning, air-humidification, ventilation or use of air currents for screening
- F24F13/24—Means for preventing or suppressing noise
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F25—REFRIGERATION OR COOLING; COMBINED HEATING AND REFRIGERATION SYSTEMS; HEAT PUMP SYSTEMS; MANUFACTURE OR STORAGE OF ICE; LIQUEFACTION SOLIDIFICATION OF GASES
- F25B—REFRIGERATION MACHINES, PLANTS OR SYSTEMS; COMBINED HEATING AND REFRIGERATION SYSTEMS; HEAT PUMP SYSTEMS
- F25B31/00—Compressor arrangements
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F24—HEATING; RANGES; VENTILATING
- F24F—AIR-CONDITIONING; AIR-HUMIDIFICATION; VENTILATION; USE OF AIR CURRENTS FOR SCREENING
- F24F13/00—Details common to, or for air-conditioning, air-humidification, ventilation or use of air currents for screening
- F24F13/24—Means for preventing or suppressing noise
- F24F2013/242—Sound-absorbing material
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- Engineering & Computer Science (AREA)
- Mechanical Engineering (AREA)
- General Engineering & Computer Science (AREA)
- Chemical & Material Sciences (AREA)
- Combustion & Propulsion (AREA)
- Physics & Mathematics (AREA)
- Thermal Sciences (AREA)
- Soundproofing, Sound Blocking, And Sound Damping (AREA)
Abstract
The invention provides a refrigeration device, which comprises a shell, wherein an accommodating space is formed in the shell; a compressor disposed in the casing; a sound-proof housing; the sound-proof housing is at least including setting gradually from outside to inside: a sound absorbing layer provided with a plurality of first sound absorbing parts arranged to penetrate the sound absorbing layer; the micro-perforated plate is at least provided with one layer, and a plurality of second sound absorption parts which penetrate through the micro-perforated plate are arranged on the micro-perforated plate; a viscoelastic film layer; when the radiation noise frequency of the compressor reaches a first frequency, the viscoelastic film layer resonates to consume energy and drives air to reciprocate and fluctuate between the second sound absorption part and the first sound absorption part to consume energy through friction; when the radiation noise frequency of the compressor reaches a second frequency, the air column in the second sound absorption part resonates, energy is consumed through friction with the second sound absorption part, the viscoelastic film layer at the position of the second sound absorption part can be driven to vibrate and consume energy, and air is driven to vibrate and consume energy in the first sound absorption part. The invention solves the problem that the refrigeration equipment in the prior art has poor sound insulation effect on the compressor.
Description
Technical Field
The invention relates to the technical field of household electrical appliances, in particular to an improvement of a refrigeration equipment structure.
Background
Noise pollution of refrigeration equipment has been a user pain point of air conditioner equipment for a long time, wherein low-frequency noise has strong penetrability due to long wavelength and is attenuated slowly to propagate for a long distance, so that the low-frequency noise becomes a key technical problem influencing user experience.
The noise source of household appliances such as refrigeration plant, refrigerator mainly is compressor noise and fan noise, and the technique of making an uproar mainly is the parcel compressor sound-proof housing for the current compressor, and the sound-proof housing is by the PVC material with porous sound absorbing material mode, or directly install the panel beating sound-proof housing around the compressor, and it is poor to inhale the sound effect.
Disclosure of Invention
In order to solve the problem that refrigeration equipment in the prior art has poor sound insulation effect on a compressor, the invention provides the refrigeration equipment which can achieve better sound insulation and noise reduction effects.
The invention is realized by adopting the following technical scheme:
a refrigeration device comprises a shell, wherein an accommodating space is formed in the shell;
a compressor disposed in the accommodating space of the casing;
also includes:
the sound-proof cover is used for covering the compressor to perform sound insulation and noise reduction on the compressor;
the sound-proof housing is at least including setting gradually from outside to inside:
a sound absorbing layer provided with a plurality of first sound absorbing parts arranged to penetrate the sound absorbing layer;
the micro-perforated plate is at least provided with one layer, and a plurality of second sound absorption parts which penetrate through the micro-perforated plate are arranged on the micro-perforated plate;
a viscoelastic film layer;
when the radiation noise frequency of the compressor reaches a first frequency, the viscoelastic film layer resonates to consume energy and drives air to reciprocate and fluctuate between the second sound absorption part of the micro-perforated plate and the first sound absorption part of the sound absorption layer to consume energy through friction; when the radiation noise frequency of the compressor reaches a second frequency, the air columns in the second sound absorption part of the micro-perforated plate resonate, the energy is consumed through friction with the second sound absorption part, the viscoelastic film layer at the position corresponding to the second sound absorption part can be driven to vibrate and consume at least, and the air is driven to vibrate and consume in the first sound absorption part of the sound absorption layer.
Furthermore, the sound insulation layer is arranged on the outer side of the sound absorption layer.
Furthermore, the sound absorption layer, the micro-perforated plate, the viscoelastic film layer and the sound insulation layer are bonded or sewn.
Furthermore, the thickness of the micro-perforated plate is 0.05 mm-15 mm, the second sound absorption part comprises micro-perforated holes, the diameter of each micro-perforated hole is 0.01 mm-5 mm, and the micro-perforated holes are circular, oval, square, triangular, square, pentagonal or hexagonal in shape.
Further, the microperforated panel material is: metal, plastic or polymer plastic.
Furthermore, the viscoelastic film layer is made of rubber, and the thickness of the viscoelastic film layer is 0.01-5 mm.
Furthermore, the microperforated panel is including first microperforated panel and second microperforated panel, the microperforated of first microperforated panel and the microperforated of second microperforated panel crisscross setting and aperture are different.
Furthermore, the sound-proof housing is including the cover body and sound-proof cap, sound-proof cap is detained and is established on the cover body, the cover body with sound-proof cap by sound absorbing layer, microperforated panel, viscoelasticity thin layer and puigging constitute.
Furthermore, the sound absorption layer is made of a polypropylene and polyester fiber composition, polyester fibers, polypropylene, polyester fibers, PPS, PBO, green felt, glass fibers, PU, Auposide, melamine or asbestos.
Further, the first frequency and the second frequency have different frequency values.
The invention has the advantages and positive effects that: :
the sound-proof shield comprises the sound-absorbing layer, the micro-perforated plate and the viscoelastic film layer which are sequentially arranged from outside to inside, when the noise of the compressor is transmitted to the sound-proof shield, the resonance of the set viscoelastic film layer can perform intramolecular friction sound-absorbing energy consumption, and simultaneously, the resonance of the viscoelastic film can drive air to rub back and forth between the micro-perforated plate and the sound-absorbing layer to perform friction energy consumption, so that the sound-absorbing energy consumption effect is enhanced;
meanwhile, the arranged micro-perforated plate can also enable the air columns to rub against the inner walls of the micro-perforated holes through the resonance of the air columns in the second sound absorption part to absorb sound and consume energy, can also drive air to fluctuate in the sound absorption layer and rub against the porous hole walls of the sound absorption layer to consume energy, and can also at least drive the viscoelastic film layer corresponding to the second sound absorption part to vibrate to consume energy through intramolecular friction;
in addition, the sound absorption layer is arranged, so that the sound absorption performance under the resonance frequency of the micro-perforated air column and the resonance frequency of the film can be enhanced, the effective noise reduction within the frequency band range of 20-20KHz can be achieved, the overall noise value is reduced, and the sound absorption and noise reduction effects of the whole soundproof shade are good.
Drawings
In order to more clearly illustrate the technical solutions of the embodiments of the present invention, the drawings needed to be used in the description of the embodiments are briefly introduced below, and it is obvious that the drawings in the following description are only some embodiments of the present invention, and it is obvious for those skilled in the art to obtain other drawings based on these drawings without creative efforts.
FIG. 1 is an overall structural view of a refrigerating apparatus according to the present invention;
FIG. 2 is a schematic view of the sound enclosure of the refrigeration unit of the present invention;
FIG. 3 is a schematic diagram of a microperforated panel in one embodiment of the acoustical enclosure of the refrigeration unit of the present invention;
FIG. 4 is a diagram showing the arrangement of the number of layers of microperforated panels in the embodiment of FIG. 3 for a sound enclosure for a refrigeration unit of the present invention;
fig. 5 is a layout of microperforations of a microperforated panel of a refrigeration unit of the present invention.
Detailed Description
The technical solutions in the embodiments of the present invention will be clearly and completely described below with reference to the drawings in the embodiments of the present invention, and it is obvious that the described embodiments are only a part of the embodiments of the present invention, and not all of the embodiments. All other embodiments, which can be derived by a person skilled in the art from the embodiments given herein without making any creative effort, shall fall within the protection scope of the present invention.
In the description of the present invention, it is to be understood that the terms "center", "upper", "lower", "front", "rear", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer", and the like indicate orientations or positional relationships based on those shown in the drawings, and are only for convenience of description and simplicity of description, and do not indicate or imply that the referenced devices or elements must have a particular orientation, be constructed and operated in a particular orientation, and thus, are not to be construed as limiting the present invention.
In the description of the present invention, it should be noted that the terms "mounted," "connected," and "connected" are to be construed broadly and may be, for example, fixedly connected, detachably connected, or integrally connected unless otherwise explicitly stated or limited. The specific meanings of the above terms in the present invention can be understood in specific cases to those skilled in the art. In the foregoing description of embodiments, the particular features, structures, materials, or characteristics may be combined in any suitable manner in any one or more embodiments or examples.
The terms "first", "second" and "first" are used for descriptive purposes only and are not to be construed as indicating or implying relative importance or implicitly indicating the number of technical features indicated. Thus, a feature defined as "first" or "second" may explicitly or implicitly include one or more of that feature. In the description of the present invention, "a plurality" means two or more unless otherwise specified.
The present invention provides an embodiment of a refrigeration apparatus, which is shown in fig. 1 to 5, and includes a casing 100, and an accommodating space is formed in the casing 100, and the refrigeration apparatus in this embodiment may be any device that adopts a compressor to refrigerate, such as an air conditioner outdoor unit, a refrigerator or a refrigerator.
A compressor 200 disposed in the receiving space of the casing 100;
the soundproof cover 300 for covering the compressor 200 to insulate sound and reduce noise of the compressor 200;
specifically, the soundproof cover 300 in this embodiment includes at least 3 layers sequentially arranged from outside to inside, where the 3 layers are:
a sound absorbing layer 310 provided with a plurality of first sound absorbing parts 311, the first sound absorbing parts 311 preferably being sound absorbing holes;
the micro-perforated plate 320 includes a second sound absorbing portion 321, the second sound absorbing portion 321 is disposed to penetrate through the micro-perforated plate 320, the second sound absorbing portion 321 includes micro-perforations and a resonant cavity penetrating through the micro-perforated plate 320, the micro-perforations may be micro-holes with different apertures, and the apertures of the micro-perforations in the micro-perforated plate 320 may be distributed according to a random or specific rule, which is not limited herein.
The sizes of the micro-perforated holes in the micro-perforated plate 320 and the size of the resonant cavity are set to be capable of correspondingly absorbing noise with a specific frequency, such as noise with a lower frequency or a higher frequency, therefore, the micro-perforated plate 320 provided in the present embodiment can set the sizes of the corresponding micro-perforated holes and resonant cavity in the micro-perforated plate 320 according to requirements, so that the micro-perforated plate can absorb noise with a specific frequency, and further the sound absorption and noise reduction effects of the whole soundproof cover 300 are better.
A viscoelastic film layer 330;
when the frequency of the radiation noise of the compressor 200 reaches a first frequency, the viscoelastic film layer 330 resonates and drives the air to fluctuate between the micro-perforated plate 320 and the sound absorption layer 310; when the frequency of the radiated noise of the compressor 200 reaches the second frequency, the air column in the second sound absorbing part 321 in the micro-perforated plate 320 resonates, rubs with the second sound absorbing part 321 to reduce noise and consume energy, and when the air column vibrates in the second sound absorbing part 321, the air column can at least drive the viscoelastic film layer 330 corresponding to the second sound absorbing part 321 to vibrate and drive air to fluctuate in the first sound absorbing part of the sound absorbing layer 310.
The frequency values of the first frequency and the second frequency are different, that is, the first frequency in this embodiment may be greater than the second frequency, and the first frequency may also be smaller than the second frequency.
The soundproof cover 300 in this embodiment includes a cover body 350 and a soundproof cap 360, the soundproof cap 360 is provided on the cover body 350, and the cover body 350 and the soundproof cap 360 are each constituted by the sound absorbing layer 310, the microperforated panel 320, the viscoelastic film layer 330, and the soundproof layer 340.
When the cover body 350 is formed, the viscoelastic film layer 330, the micro-perforated plate 320, the sound absorbing layer 310 and the sound insulating layer 340 are sequentially connected and fixed together, then the annular cover body 350 is formed, the cover body 350 is sleeved on the periphery of the compressor 200 after being formed, noise with a certain vibration frequency is generated when the compressor 200 vibrates, when the radiation noise frequency of the compressor 200 reaches a first frequency, the viscoelastic film layer 330 is driven to resonate, at the moment, because the viscoelastic film layer 330 has viscosity, intramolecular friction is generated during resonance, energy consumption and noise reduction are realized through intramolecular friction of the viscoelastic film layer 330, meanwhile, air is driven to fluctuate in the micro-perforated plate 320 and the sound absorbing layer 310, the resonant cavity and the sound absorbing hole of the sound absorbing layer 310 during vibration of the viscoelastic film layer 330, and the air fluctuates back and forth in the micro-perforated plate, the resonant cavity and the sound absorbing hole under the reflection action of the sound insulating layer 340, the reciprocating friction is carried out with the micro-perforation, the inner wall of the resonant cavity and the inner wall of the sound absorption hole, so that the effects of friction energy consumption and noise reduction are achieved.
When the noise of the compressor 200 reaches the second frequency value, the air column in the second sound absorbing part 321 of the micro-perforated plate 320 is driven to resonate, and the air column in the second sound absorbing part 321 and the inner wall of the micro-perforation rub to consume energy, meanwhile, because the micro-perforated plate 320 is connected with the viscoelastic film layer 330, the viscoelastic film layer 330 corresponding to the micro-perforation is driven to vibrate by the air column in the micro-perforation, and possibly drives the air at other positions of the viscoelastic film layer 330 to vibrate, so that the viscoelastic film layer 330 generates intramolecular friction, and the noise reduction and energy consumption are realized. Moreover, due to the vibration of the micro-perforated holes and the air columns in the resonant cavity, air can be driven to fluctuate back and forth in the sound absorbing holes in the sound absorbing layer 310 and rub against the walls of the sound absorbing holes, so that friction energy consumption is realized, friction consumption on noise is realized through the cooperation of the micro-perforated plate 320, the viscoelastic film layer 330 and the sound absorbing layer 310, and noise reduction is realized.
Further, the sound absorption layer 310 provided in this embodiment can enhance the sound absorption performance under the resonance frequency of the air resonance and the viscoelastic film layer 330 in the second sound absorption portion 321 in the micro-perforated plate 320, and can also achieve effective noise reduction within the frequency band range of 20-20KHz, thereby reducing the overall noise value, and further making the whole soundproof cover 300 have good sound absorption and noise reduction effects.
Preferably, the sound absorption layer 310 in this embodiment has a thickness of 1mm to 100 mm.
The sound absorbing layer 310 includes, but is not limited to, the following porous sound absorbing materials: polypropylene and polyester fiber composition, polyester fiber, polypropylene, polyester fiber, PPS, PBO or a combination of the materials, green felt, glass fiber, PU, Auposide, melamine, asbestos, metal foam and the like.
Further, the sound insulation layer 340 is further included, and the sound insulation layer 340 is disposed outside the sound absorption layer 310.
Preferably, the sound absorbing layer 310, the microperforated panel 320, the viscoelastic film layer 330 and the sound insulating layer 340 are bonded or sewn together.
When this embodiment sets up, set up microperforated panel 320's thickness is 0.05mm ~ 15mm, and microperforated hole diameter is 0.01mm ~ 5mm, and the shape is circular, oval, square, triangle-shaped, quadrangle, pentagon or hexagon, makes it can be used to satisfy and to inhale the effect of making an uproar to the specific frequency noise.
The microperforated panel 320 in this embodiment may be made of: metal, plastic, or polymer plastic, etc., and is not particularly limited herein.
Preferably, the viscoelastic film layer 330 in this embodiment is made of rubber, and has a thickness of 0.01mm to 5mm, so that it can absorb sound and reduce noise at a specific frequency.
For the whole sound-proof housing 300 of further reinforcing inhale the sound effect of making an uproar and fall in order to increase the frequency range that the sound was inhaled and is fallen, this embodiment makes when setting up microperforated panel 320 is including first microperforated panel 322 and second microperforated panel 323, sets up 2 layers of microperforated panel 320 promptly, just the microperforation of first microperforated panel 322 and the crisscross setting of the microperforation of second microperforated panel 323 can be used to prevent that the sound wave from directly running through, the aperture of the microperforation in 2 layers of microperforated panel 320 is different, through setting up and matching two-layer micropore layer aperture, can make its noise figure that absorbs different frequency sections that corresponds, increased the frequency range that the sound was inhaled and is fallen, improved the sound effect.
Of course, in this embodiment, a third micro-perforated plate may be correspondingly disposed, so that micro-perforations of the third micro-perforated plate and micro-perforations of the first micro-perforated plate 322 and the second micro-perforated plate 323 are respectively disposed in a staggered manner, and when the third micro-perforated plate corresponds to a noise value of another frequency, resonance occurs, and the sound absorption and noise reduction range is further expanded.
Of course, a fourth microplate … … may also be provided, and is not particularly limited herein.
Meanwhile, in order to further enhance the sound absorption effect, the sound absorption layer 310 is further disposed between the adjacent first micro-perforated plate 322 and the second micro-perforated plate 323 in this embodiment, so that the sound absorption and noise reduction effects of the whole soundproof cover 300 are better.
The above description is only for the specific embodiments of the present invention, but the scope of the present invention is not limited thereto, and any changes or substitutions that can be easily conceived by those skilled in the art within the technical scope of the present invention are included in the scope of the present invention. Therefore, the protection scope of the present invention shall be subject to the protection scope of the claims.
Claims (10)
1. A refrigeration device comprises a shell, wherein an accommodating space is formed in the shell;
a compressor disposed in the accommodating space of the casing;
it is characterized by also comprising:
the sound-proof cover is used for covering the compressor to perform sound insulation and noise reduction on the compressor;
the sound-proof housing is at least including setting gradually from outside to inside:
a sound absorbing layer provided with a plurality of first sound absorbing parts arranged to penetrate the sound absorbing layer;
the micro-perforated plate is at least provided with one layer, and a plurality of second sound absorption parts which penetrate through the micro-perforated plate are arranged on the micro-perforated plate;
a viscoelastic film layer;
when the radiation noise frequency of the compressor reaches a first frequency, the viscoelastic film layer resonates to consume energy and drives air to reciprocate and fluctuate between the second sound absorption part of the micro-perforated plate and the first sound absorption part of the sound absorption layer to consume energy through friction; when the radiation noise frequency of the compressor reaches a second frequency, the air columns in the second sound absorption part of the micro-perforated plate resonate, the energy is consumed through friction with the second sound absorption part, the viscoelastic film layer at the position corresponding to the second sound absorption part can be driven to vibrate and consume at least, and the air is driven to vibrate and consume in the first sound absorption part of the sound absorption layer.
2. The refrigeration apparatus of claim 1 further comprising an acoustical layer disposed outside of said sound absorbing layer.
3. The refrigeration appliance according to claim 1, wherein the sound absorbing layer, the microperforated panel, the viscoelastic film layer and the sound insulating layer are adhesively secured or sewn secured to one another.
4. The refrigerating apparatus as claimed in claim 1, wherein the micro-perforated plate has a thickness of 0.05mm to 15mm, and the second sound absorbing part includes micro-perforated holes having a diameter of 0.01mm to 5mm and a shape of a circle, an ellipse, a square, a triangle, a quadrangle, a pentagon or a hexagon.
5. The refrigeration apparatus as claimed in claim 1, wherein the microperforated sheet is made of: metal, plastic or polymer plastic.
6. The refrigeration equipment as claimed in claim 1, wherein the viscoelastic film layer is made of rubber and has a thickness of 0.01mm to 5 mm.
7. The refrigeration device as recited in claim 4 wherein the microperforated panel comprises a first microperforated panel and a second microperforated panel, and wherein the microperforations of the first microperforated panel and the microperforations of the second microperforated panel are staggered and have different apertures.
8. The refrigeration device as claimed in claim 1, wherein the soundproof cover comprises a cover body and a soundproof cap, the soundproof cap is fastened on the cover body, and the cover body and the soundproof cap are both composed of the sound absorbing layer, the micro-perforated plate, the viscoelastic film layer and the soundproof layer.
9. The refrigeration equipment as claimed in claim 1, wherein the sound absorption layer is made of polypropylene and polyester fiber composition, polyester fiber, polypropylene, polyester fiber, PPS, PBO, green felt, glass fiber, PU, Auposi, melamine or asbestos.
10. The refrigeration appliance according to claim 1, wherein the first frequency and the second frequency have different frequency values.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202010140054.3A CN111238019A (en) | 2020-03-03 | 2020-03-03 | Refrigerating equipment |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202010140054.3A CN111238019A (en) | 2020-03-03 | 2020-03-03 | Refrigerating equipment |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN111238019A true CN111238019A (en) | 2020-06-05 |
Family
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Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN202010140054.3A Pending CN111238019A (en) | 2020-03-03 | 2020-03-03 | Refrigerating equipment |
Country Status (1)
| Country | Link |
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| CN (1) | CN111238019A (en) |
Cited By (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN112283809A (en) * | 2020-10-30 | 2021-01-29 | 青岛海信日立空调***有限公司 | Outdoor air conditioner |
| CN112815404A (en) * | 2021-01-06 | 2021-05-18 | 青岛海信日立空调***有限公司 | Outdoor unit of air conditioner |
| CN113932322A (en) * | 2021-10-28 | 2022-01-14 | 珠海格力电器股份有限公司 | Compressor assembly and air conditioner with same |
| CN113958496A (en) * | 2020-07-21 | 2022-01-21 | 佛山市美的清湖净水设备有限公司 | Pump assembly structure and have its water purification unit |
| GB2621015A (en) * | 2023-06-06 | 2024-01-31 | Pineapple Contracts Unlimited | Wall panel |
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| Publication number | Priority date | Publication date | Assignee | Title |
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| CN113958496A (en) * | 2020-07-21 | 2022-01-21 | 佛山市美的清湖净水设备有限公司 | Pump assembly structure and have its water purification unit |
| CN112283809A (en) * | 2020-10-30 | 2021-01-29 | 青岛海信日立空调***有限公司 | Outdoor air conditioner |
| CN112815404A (en) * | 2021-01-06 | 2021-05-18 | 青岛海信日立空调***有限公司 | Outdoor unit of air conditioner |
| CN112815404B (en) * | 2021-01-06 | 2022-07-01 | 青岛海信日立空调***有限公司 | Outdoor unit of air conditioner |
| CN113932322A (en) * | 2021-10-28 | 2022-01-14 | 珠海格力电器股份有限公司 | Compressor assembly and air conditioner with same |
| GB2621015A (en) * | 2023-06-06 | 2024-01-31 | Pineapple Contracts Unlimited | Wall panel |
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Application publication date: 20200605 |