CN211526642U - Hidden annular double-voltage electrostatic field filtering heat exchange device for wall-penetrating pipeline - Google Patents
Hidden annular double-voltage electrostatic field filtering heat exchange device for wall-penetrating pipeline Download PDFInfo
- Publication number
- CN211526642U CN211526642U CN201921043671.0U CN201921043671U CN211526642U CN 211526642 U CN211526642 U CN 211526642U CN 201921043671 U CN201921043671 U CN 201921043671U CN 211526642 U CN211526642 U CN 211526642U
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- heat exchange
- dust collecting
- pipeline
- annular
- fixed
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- 230000005686 electrostatic field Effects 0.000 title claims abstract description 17
- 238000001914 filtration Methods 0.000 title claims abstract description 17
- 239000000428 dust Substances 0.000 claims abstract description 80
- 229910052782 aluminium Inorganic materials 0.000 claims description 4
- XAGFODPZIPBFFR-UHFFFAOYSA-N aluminium Chemical compound [Al] XAGFODPZIPBFFR-UHFFFAOYSA-N 0.000 claims description 4
- 230000006978 adaptation Effects 0.000 claims description 2
- 238000004887 air purification Methods 0.000 claims description 2
- 239000012717 electrostatic precipitator Substances 0.000 abstract description 3
- 238000009434 installation Methods 0.000 abstract description 2
- 238000000746 purification Methods 0.000 abstract description 2
- 230000004323 axial length Effects 0.000 description 6
- 238000010586 diagram Methods 0.000 description 4
- 238000005516 engineering process Methods 0.000 description 4
- 230000000712 assembly Effects 0.000 description 2
- 238000000429 assembly Methods 0.000 description 2
- 238000000354 decomposition reaction Methods 0.000 description 1
- 238000003780 insertion Methods 0.000 description 1
- 230000037431 insertion Effects 0.000 description 1
- 229910052751 metal Inorganic materials 0.000 description 1
- 239000002184 metal Substances 0.000 description 1
- 238000012986 modification Methods 0.000 description 1
- 230000004048 modification Effects 0.000 description 1
- 230000002093 peripheral effect Effects 0.000 description 1
- 238000011084 recovery Methods 0.000 description 1
- 239000000758 substrate Substances 0.000 description 1
- 238000003466 welding Methods 0.000 description 1
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- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02A—TECHNOLOGIES FOR ADAPTATION TO CLIMATE CHANGE
- Y02A50/00—TECHNOLOGIES FOR ADAPTATION TO CLIMATE CHANGE in human health protection, e.g. against extreme weather
- Y02A50/20—Air quality improvement or preservation, e.g. vehicle emission control or emission reduction by using catalytic converters
- Y02A50/2351—Atmospheric particulate matter [PM], e.g. carbon smoke microparticles, smog, aerosol particles, dust
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- Electrostatic Separation (AREA)
Abstract
The utility model relates to the technical field of fresh air, in particular to a hidden annular double-voltage electrostatic field filtering heat exchange device for a wall-through pipeline, which is characterized in that the filtering heat exchange device comprises an outer ring pipeline and an inner ring heat exchange pipe, wherein the inner ring heat exchange pipe is arranged in the outer ring pipeline, indoor return air is communicated with the inner ring heat exchange pipe, and outdoor fresh air is communicated between the inner ring heat exchange pipe and the outer ring pipeline; and an electrostatic dust removal assembly for purifying outdoor fresh air is arranged between the inner ring heat exchange tube and the outer ring pipeline. The utility model has the advantages that: can realize carrying out indoor air exhaust and outdoor new trend in the pipeline and carry out high-efficient heat transfer, simultaneously, use the electrostatic precipitator piece of ring arrangement in outdoor new trend passageway to the new trend purification, whole device and pipeline combination, the structure is exquisite, simple installation.
Description
Technical Field
The utility model relates to a new trend technical field, concretely relates to wear hidden annular two voltage electrostatic field of wall pipeline and filter heat exchange device.
Background
At present, the fresh air technology is gradually applied to the use scenes of the public, and more and wider fresh air technologies are invented and created;
meanwhile, the fresh air technology is more and more refined and smaller, however, in the prior art, the fresh air dedusting technology is not applied to the function of hiding the pipeline, and meanwhile, the corresponding fresh air and indoor return air are not used for realizing the heat exchange function in the pipeline.
SUMMERY OF THE UTILITY MODEL
In order to realize the aim, the utility model provides a hidden two voltage electrostatic field of ring shape of wall-penetrating type pipeline filter heat exchange device.
The utility model discloses a concrete technical scheme as follows: the wall-through pipeline hidden type annular double-voltage electrostatic field filtering heat exchange device comprises an outer annular pipeline and an inner annular heat exchange pipe, wherein the inner annular heat exchange pipe is arranged in the outer annular pipeline, indoor return air is led to the inner annular heat exchange pipe, and outdoor fresh air is led to the space between the inner annular heat exchange pipe and the outer annular pipeline;
and an electrostatic dust removal assembly for purifying outdoor fresh air is arranged between the inner ring heat exchange tube and the outer ring pipeline.
Furthermore, the electrostatic dust removal assembly comprises an inner shell, an insulating outer shell and a fixed base;
both ends of the inner shell and both ends of the insulating outer shell are fixed on the fixed base;
an inner shell is matched with the outer periphery side of the inner ring heat exchange tube, and an insulating outer shell is matched with the inner periphery side of the outer ring pipeline;
a plurality of positive dust collecting pieces and negative dust collecting pieces which are arranged in a staggered mode are arranged between the inner shell and the insulating outer shell, and a fresh air purification channel is arranged between the positive dust collecting pieces and the negative dust collecting pieces.
Furthermore, the cross-sectional shapes of the positive electrode dust collecting piece and the negative electrode dust collecting piece are both arc-shaped structures.
Furthermore, the positive dust collecting sheet and the negative dust collecting sheet are formed by splicing a plurality of rectangular plate-shaped dust collecting sheets.
Furthermore, the direction of the electrostatic dust collection assembly facing the fresh air inlet is a corona area.
Furthermore, two ends of the positive dust collecting piece and the negative dust collecting piece are fixed on a fixed base, and the fixed base is arranged in parallel to the axis direction of the outer ring pipeline or the inner ring heat exchange pipe;
the inner side of the outer ring pipeline is provided with a boss which extends inwards to form a boss;
and a concave structure matched with the boss is formed in the direction of the fixed base facing the boss.
Furthermore, the inner shell is composed of two or more unit inner shells, the insulating outer shell is composed of unit outer shells with the same number as the unit inner shells, the fixing bases are composed of unit fixing bases with the same number as the unit inner shells, two ends of each unit inner shell and the unit outer shell are correspondingly fixed on the unit fixing bases respectively, and a concave structure matched with the boss is formed on any one unit fixing base;
the unit inner shells are a first inner shell, a second inner shell or more;
the unit insulating shell is a first insulating shell, a second insulating shell or more;
the fixed base is a first fixed base, a second fixed base or more;
further, the positive electrode dust collecting piece and the negative electrode dust collecting piece are provided with fixing holes and through holes, the positive electrode dust collecting piece and the negative electrode dust collecting piece are fixed in series through the positive electrode piece associated fastening screw and the negative electrode piece associated fastening screw, and an isolating aluminum gasket matched with the positive electrode piece associated fastening screw and the negative electrode piece associated fastening screw is arranged at the through holes;
and the two ends of the positive plate related fastening screw and the negative plate related fastening screw are respectively and correspondingly fixed on the inner shell and the insulating outer shell.
Further, an ionizing wire fixing support is arranged in the corona region;
ionization silk fixed bolster includes a support inner ring, a support outer loop, the support inner ring with connect through the rib between the support outer loop to be provided with the fixed knot structure of adaptation, or joint fixed baseplate between support inner ring and support outer loop, at the rib towards one side of positive pole collection dirt piece and negative pole collection dirt piece extends and forms the extension, have the fixed knot who runs through the through-hole structure or fixed ionization silk that can allow the ionization silk to pass through on the extension.
Further, the shape of the support inner ring is matched with the cross-sectional shape of the inner shell, and the shape of the support outer ring is matched with the cross-sectional shape of the insulating outer shell.
The utility model has the advantages that: can realize carrying out indoor air exhaust and outdoor new trend in the pipeline and carry out high-efficient heat transfer, simultaneously, use the electrostatic precipitator piece of ring arrangement in outdoor new trend passageway to the new trend purification, whole device and pipeline combination, the structure is exquisite, simple installation.
Drawings
Fig. 1(a) is a first perspective view of the present invention;
fig. 1(b) is a perspective view of the second viewing angle of the present invention;
fig. 2 is a schematic diagram of the overall structure of the present invention;
fig. 3 is a schematic diagram of the detail structure of the present invention;
fig. 4(a) is a schematic front view of the present invention;
fig. 4(b) is a schematic cross-sectional view of the present invention.
Detailed Description
In order to make the objects, technical solutions and advantages of the present invention more clearly understood, the present invention is further described in detail below with reference to the accompanying drawings and embodiments. It should be understood that the specific embodiments described herein are merely illustrative of the invention and are not intended to limit the invention.
On the contrary, the invention is intended to cover alternatives, modifications, equivalents and alternatives which may be included within the spirit and scope of the invention as defined by the appended claims. Furthermore, in order to provide a better understanding of the present invention to the public, certain specific details are set forth in the following detailed description of the invention. It will be apparent to those skilled in the art that the present invention may be practiced without these specific details.
As shown in fig. 1 and 2, for the overall structure schematic diagram and the overall decomposition schematic diagram of the hidden annular dual-voltage electrostatic field filtering heat exchange device for the wall-through pipe provided by the present invention, the filtering heat exchange device includes an outer ring pipe 1 and an inner ring heat exchange pipe 2;
the inner ring heat exchange tube 2 is arranged in the outer ring pipeline 1, and the outer ring pipeline 1 and the inner ring heat exchange tube 2 are coaxially arranged;
in the embodiment, in order to adapt to the wall-penetrating pipeline, the cross section of the outer ring pipeline 1 is of an approximately circular structure, and the cross section of the inner ring heat exchange tube 2 is of a circular structure;
the interior of the inner ring heat exchange tube 2 is used for allowing the indoor return air to pass through, the fresh air entering from the outdoor is used between the outer ring pipeline 1 and the inner ring heat exchange tube 2, and the inner ring heat exchange tube 2 adopts a high-heat-conductivity recovery metal tube and is used for realizing heat exchange between the indoor return air and the outdoor fresh air;
an electrostatic dust removal assembly 3 is arranged between the outer ring pipeline 1 and the inner ring heat exchange pipe 2, the inner ring heat exchange pipe 2 is surrounded between the electrostatic dust removal assemblies, and fresh air entering from the outdoor can be purified by the electrostatic dust removal assembly 3;
the inner side of the outer ring pipeline 1 is provided with a boss 10 which extends inwards;
as shown in fig. 3 and 4, the electrostatic dust collection assembly 3 includes an inner shell assembly adapted to the cross-sectional dimension of the outer periphery of the inner ring heat exchange tube 2, an insulating shell assembly adapted to the cross-sectional dimension of the inner periphery of the outer ring pipeline 1, a first fixing base 33, a second fixing base 34, positive and negative substrate assemblies, an ionizing wire 40, and an ionizing wire fixing bracket 39;
the inner shell assembly comprises a first inner shell 31 and a second inner shell 32, the cross sections of the first inner shell 31 and the second inner shell 32 are both arc-shaped structures, one end of the first inner shell 31 is fixed at the upper end of one side of the first fixing base 33, the other end of the first inner shell 31 is fixed at the upper end of one side of the second fixing base 34, one end of the second inner shell 32 is fixed at the lower end of one side of the first fixing base 33, and the other end of the second inner shell 32 is fixed at the lower end of one side of the second fixing base 34;
the first fixed base 33 and the second fixed base 34 are arranged in parallel to the axial direction of the inner ring heat exchange tube 2 or the outer ring pipeline 1, and the first inner shell 31 and the second inner shell 32 are respectively and correspondingly fixed on one sides of the first fixed base 33 and the second fixed base 34 facing the inner ring heat exchange tube 2;
the cross-sectional dimension of the outer peripheral side of the inner ring heat exchanger tube 2 is fitted to the inner side of the first inner shell 31, the second inner shell 32, the first fixed base 33, and the second fixed base 34 after the connection;
the insulating housing assembly comprises a first insulating housing 37 and a second insulating housing 38, the cross sections of the first insulating housing 37 and the second insulating housing 38 are both arc-shaped structures, one end of the first insulating housing 37 is fixed at the upper end of the other side of the first fixing base 33, the other end of the first insulating housing 37 is fixed at the upper end of the other side of the second fixing base 34, one end of the second insulating housing 38 is fixed at the lower end of the other side of the first fixing base 33, and the other end of the second insulating housing 38 is fixed at the lower end of the other end of the second fixing base 34;
the first insulating housing 37 and the second insulating housing 38 are respectively fixed on the sides of the first fixing base 33 and the second fixing base 34 facing the outer ring pipeline 1;
the cross-sectional dimension of the inner periphery of the outer ring pipeline 1 is adapted to the outer side of the first insulating shell 37, the second insulating shell 38, the first fixing base 33 and the second fixing base 34 after being connected;
the fixing modes of the insulating outer shells (37, 38), the inner shells (31, 32) and the bases (33, 34) include but are not limited to fixing modes such as insertion, clamping, fixed welding and the like;
a plurality of positive electrode dust collecting pieces 35 and a plurality of negative electrode dust collecting pieces 36 are provided between the first insulating outer case 37 and the first inner case 31, and a plurality of positive electrode dust collecting pieces 35 and a plurality of negative electrode dust collecting pieces 36 are provided between the second insulating outer case 38 and the second inner case 32;
the positive dust collecting pieces 35 and the negative dust collecting pieces 36 are arranged to intersect with each other;
the positive dust collecting piece 35 and the negative dust collecting piece 36 are formed by splicing a plurality of rectangular plate-shaped dust collecting piece units, and the spliced positive dust collecting piece 35 or negative dust collecting piece 36 is of a structure with an approximate arc-shaped section;
the axial length of the positive dust collecting piece 35 and the axial length of the negative dust collecting piece 36 are both smaller than the axial length of the insulating outer shell and the axial length of the inner shell, and the axial length of the insulating outer shell is the same as the axial length of the inner shell;
a plurality of dust collecting piece fixing grooves are formed in the first fixing base 33 and the second fixing base 34, and the dust collecting piece fixing grooves are formed along the axial direction and are respectively formed in the upper side surface and the lower side surface of the first fixing base 33 and the second fixing base 34;
a plurality of fixing holes 43 and through holes 44 are formed in the positive dust collecting piece 35 and the negative dust collecting piece 36, and it can be specifically understood that a positive dust collecting piece fixing hole and a positive dust collecting piece through hole are formed in the positive dust collecting piece 35, a negative dust collecting piece fixing hole and a negative dust collecting piece through hole are formed in the negative dust collecting piece 36, the positions of the positive dust collecting piece fixing hole and the negative dust collecting piece through hole correspond to each other, and the positions of the positive dust collecting piece through hole and the negative dust collecting piece through hole correspond to each other;
the present embodiment further includes a negative plate-related fastening screw 41 and a positive plate-related fastening screw 42, the negative plate-related fastening screw 41 and the positive plate-related fastening screw 42 are fixed at one end to the insulating outer shell, and at the other end to the inner shell, the corresponding negative plate-related fastening screw 41 respectively passes through the positive dust collecting plate through hole and the negative dust collecting plate fixing hole in sequence, and the positive plate-related fastening screw 42 respectively passes through the negative dust collecting plate through hole and the positive dust collecting plate fixing hole in sequence;
specifically, the diameter of the through hole 44 is larger than that of the fixing hole 43, and the positions of the fixing hole 43 and the through hole 44 are mutually crossed and opposite;
the isolating aluminum gasket 45 is respectively abutted against the periphery sides of the fixing holes 43 of the two corresponding adjacent negative dust collecting pieces 36 or two corresponding positive dust collecting pieces 35, and passes through the through holes of the positive dust collecting pieces 35 or the negative dust collecting pieces 36 clamped in the middle;
the isolating aluminum gasket 45 is of a hollow structure and allows the positive plate-associated fastening screw 42 or the negative plate-associated fastening screw 41 to pass through;
the number of the positive-electrode-sheet-associated fastening screws 42 or the negative-electrode-sheet-associated fastening screws 41 may be 1 or more, and the number may be more than one as required for fixation stability;
the ionization wire fixing bracket 39 is arranged on one side of the positive electrode dust collecting piece 35 and the negative electrode dust collecting piece 36 facing the air inlet of the pipeline; the ionizing wire fixing bracket 39 comprises a bracket inner ring 391 and a bracket outer ring 392, the bracket inner ring 391 is connected with the bracket outer ring 392 through a rib 393, a fixing structure which is matched with or clamped with the first fixing base 33 and the second fixing base 34 is arranged between the bracket inner ring 391 and the bracket outer ring 392, an extension part is formed by extending one side of the rib 393 facing the positive dust collecting piece 35 and the negative dust collecting piece 36, the extension part adopts an approximately triangular structure in the embodiment, and the extension part is provided with a through hole structure which can allow the ionizing wire 40 to pass through, or is replaced by other structures which can allow the ionizing wire 40 to pass through;
one side of the first fixing base 33 opposite to the first inner shell 31 or the second inner shell 32 is a concave structure, the concave structure is matched with the boss 10, and the boss 10 is inserted into the concave structure;
the structures of the boss 10 and the recess may be correspondingly provided with structures allowing electrical connection or allowing conductive structures such as cables or wires to pass through the through holes, and are not particularly limited;
use the above-mentioned structure of the utility model, can realize in the finite space of pipeline, integrated electrostatic precipitator structure to carry out the efficient heat exchange to indoor wind and outdoor wind.
Claims (10)
1. The wall-through pipeline hidden type annular double-voltage electrostatic field filtering heat exchange device is characterized by comprising an outer annular pipeline and an inner annular heat exchange pipe, wherein the inner annular heat exchange pipe is arranged in the outer annular pipeline, indoor return air is led to the inner annular heat exchange pipe, and outdoor fresh air is led between the inner annular heat exchange pipe and the outer annular pipeline;
and an electrostatic dust removal assembly for purifying outdoor fresh air is arranged between the inner ring heat exchange tube and the outer ring pipeline.
2. The hidden type annular double-voltage electrostatic field filtering heat exchange device for the through-wall pipeline as claimed in claim 1, wherein the electrostatic dust removal assembly comprises an inner shell, an insulating outer shell and a fixed base;
both ends of the inner shell and both ends of the insulating outer shell are fixed on the fixed base;
an inner shell is matched with the outer periphery side of the inner ring heat exchange tube, and an insulating outer shell is matched with the inner periphery side of the outer ring pipeline;
a plurality of positive dust collecting pieces and negative dust collecting pieces which are arranged in a staggered mode are arranged between the inner shell and the insulating outer shell, and a fresh air purification channel is arranged between the positive dust collecting pieces and the negative dust collecting pieces.
3. The hidden annular dual-voltage electrostatic field filtering heat exchange device for the through-wall pipeline as claimed in claim 2, wherein the cross-sectional shapes of the positive dust collecting plate and the negative dust collecting plate are arc-shaped structures.
4. The hidden annular double-voltage electrostatic field filtering heat exchange device for the through-wall pipeline as claimed in claim 3, wherein the positive dust collecting sheet and the negative dust collecting sheet are formed by splicing a plurality of rectangular plate-shaped dust collecting sheets.
5. The hidden annular double-voltage electrostatic field filtering heat exchange device for the wall-penetrating pipe as claimed in claim 2, wherein the direction of the electrostatic dust removal assembly facing the fresh air inlet is a corona region.
6. The hidden annular dual-voltage electrostatic field filtering heat exchange device for the wall-penetrating pipe as claimed in claim 2, wherein two ends of the positive dust collecting sheet and the negative dust collecting sheet are fixed on a fixed base, and the fixed base is arranged in parallel with the axial direction of the outer annular pipe or the inner annular heat exchange pipe;
the inner side of the outer ring pipeline is provided with a boss which extends inwards to form a boss;
and a concave structure matched with the boss is formed in the direction of the fixed base facing the boss.
7. The hidden type annular double-voltage electrostatic field filtering heat exchange device for the through-wall pipes as claimed in any one of claim 6, wherein the inner shell is composed of two or more unit inner shells, the insulating outer shell is composed of unit outer shells with the same number as the unit inner shells, the fixing bases are composed of unit fixing bases with the same number as the unit inner shells, two ends of each unit inner shell and each unit outer shell are respectively and correspondingly fixed on the unit fixing bases, and a concave structure matched with the boss is formed on any one of the unit fixing bases.
8. The wall-penetrating pipe hidden type annular dual-voltage electrostatic field filtering heat exchange device according to claim 2, wherein fixing holes and through holes are formed in the positive electrode dust collecting sheet and the negative electrode dust collecting sheet, the positive electrode dust collecting sheet and the negative electrode dust collecting sheet are fixed in series through the positive electrode sheet associated fastening screw and the negative electrode sheet associated fastening screw, and an isolating aluminum gasket matched with the positive electrode sheet associated fastening screw and the negative electrode sheet associated fastening screw is arranged at the through holes;
and the two ends of the positive plate related fastening screw and the negative plate related fastening screw are respectively and correspondingly fixed on the inner shell and the insulating outer shell.
9. The wall-penetrating pipe hidden type annular double-voltage electrostatic field filtering heat exchange device as claimed in claim 5, wherein the corona region is provided with an ionizing wire fixing bracket;
ionization silk fixed bolster includes a support inner ring, a support outer loop, the support inner ring with connect through the rib between the support outer loop to be provided with the fixed knot structure of adaptation, or joint fixed baseplate between support inner ring and support outer loop, at the rib towards one side of positive pole collection dirt piece and negative pole collection dirt piece extends and forms the extension, have the fixed knot who runs through the through-hole structure or fixed ionization silk that can allow the ionization silk to pass through on the extension.
10. The hidden type annular double-voltage electrostatic field filtering heat exchange device for the through-wall pipeline as claimed in claim 9, wherein the shape of the inner ring of the bracket is matched with the cross-sectional shape of the inner shell, and the shape of the outer ring of the bracket is matched with the cross-sectional shape of the insulating outer shell.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201921043671.0U CN211526642U (en) | 2019-07-05 | 2019-07-05 | Hidden annular double-voltage electrostatic field filtering heat exchange device for wall-penetrating pipeline |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201921043671.0U CN211526642U (en) | 2019-07-05 | 2019-07-05 | Hidden annular double-voltage electrostatic field filtering heat exchange device for wall-penetrating pipeline |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN211526642U true CN211526642U (en) | 2020-09-18 |
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| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201921043671.0U Expired - Fee Related CN211526642U (en) | 2019-07-05 | 2019-07-05 | Hidden annular double-voltage electrostatic field filtering heat exchange device for wall-penetrating pipeline |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN211526642U (en) |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN110398018A (en) * | 2019-07-05 | 2019-11-01 | 云森威尔智能环境（深圳）有限公司 | The concealed annular twin voltage electrostatic field of wall feed-through pipeline filters heat-exchange device |
-
2019
- 2019-07-05 CN CN201921043671.0U patent/CN211526642U/en not_active Expired - Fee Related
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN110398018A (en) * | 2019-07-05 | 2019-11-01 | 云森威尔智能环境（深圳）有限公司 | The concealed annular twin voltage electrostatic field of wall feed-through pipeline filters heat-exchange device |
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| Date | Code | Title | Description |
|---|---|---|---|
| GR01 | Patent grant | ||
| GR01 | Patent grant | ||
| CF01 | Termination of patent right due to non-payment of annual fee |
Granted publication date: 20200918 |