CN102189358B - The source of welding current - Google Patents
The source of welding current Download PDFInfo
- Publication number
- CN102189358B CN102189358B CN201110060009.8A CN201110060009A CN102189358B CN 102189358 B CN102189358 B CN 102189358B CN 201110060009 A CN201110060009 A CN 201110060009A CN 102189358 B CN102189358 B CN 102189358B
- Authority
- CN
- China
- Prior art keywords
- fan
- casing
- radiator
- electric component
- wind
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Expired - Fee Related
Links
Landscapes
- Arc Welding Control (AREA)
Abstract
The invention provides a kind of source of welding current, it can reduce the harmful effect to electric component of iron powder or the moisture generation sucked by fan, and easily cleaning is provided with the radiator of electric component.The wind path (25) being configured at the rear portion of casing (20) is that lengthwise shape extends along face, both ends (20c-20d) direction of casing (20), and length direction both ends are the outlet of wind.The length direction pars intermedia of the rear of wind path (25) is located at by first fan (21), the anterior face of wind path is located at by the radiator (23) configuring the first electric component overleaf, along fin (23b) flows after contacting radiator (23) from the wind of the first fan (21) with right angle orientation.Second fan (27) is arranged on upper baffle plate (24) in anterior face (20a) side of casing, cools the second electric component (30) be located in the inner space (33) of casing (20).Outlet and the ventilation hole (29) of the wind sent from the second fan (27) is formed in the bottom faces (20f) of casing.
Description
Technical field
The present invention relates to a kind of source of welding current being provided with cooling fan.
Background technology
General circuit structure with reference to accompanying drawing 2 pairs of sources of welding current is described.The electric power supplied by the source power supply 1 as three-phase alternating-current supply in same figure is by primary side rectifier 2 rectification, and this direct current power be rectified is level and smooth by smmothing capacitor 4.The electric power of high frequency is transformed to by the electric power that the inverter circuit 5 be made up of semiconductor element is level and smooth.Control circuit 6 detects welding current by current detector 10, and controls inverter circuit 5 for output current value becomes predetermined current setting value.High frequency power is boosted or step-down by transformer 7, and by secondary side rectifier 8 rectification.The radio-frequency component of the direct current power after this rectification is supplied electric power by primary side reactor 9 smooth cut between the illustrated welding torch of omission be connected with lead-out terminal 11 and machined object.
With regard to the source of welding current in the past, fan for the heat generating components such as electronic unit or transformer of cooling settings in inside is arranged on the position of rear near bottom surface of the source of welding current usually, and offers the peristome in approximate same size with fan at rear.And, owing to placing the source of welding current aloft under the environment of the ground iron powder accumulateds such as factory or the iron powder that swims, easily suck iron powder from the peristome of fan.In addition, when the outdoor application source of welding current, easily rainwater is entered from the peristome of fan.Consequently, occurred that the iron powder that sucked by fan or moisture cause dysgenic problem to electric component.
On the other hand, in order to improve the situation easily sucking iron powder or moisture, propose have fan to be arranged at the source of welding current (such as with reference to patent documentation 1) of upper side.In this source of welding current, because fan is arranged at the position leaving ground, therefore be not easy to suck iron powder or moisture from outside, but, flowing due to the air produced by fan becomes the direction from top towards bottom, therefore form the structure piling up the electric components such as the radiator of mounting electrical parts or transformer in the vertical, therefore, less to the configuration tolerance of electric component.In addition, due to the easy iron powder accumulated of radiator, therefore need termly jet gun to be blown attached air towards radiator, thus remove this iron powder.Now, owing to being configured with parts up and down, so the cleaning of radiator is more difficult at radiator.
Patent documentation 1: Japanese Unexamined Patent Publication 2007-105741 publication
As mentioned above, in the source of welding current in the past, the rear being arranged on the source of welding current at fan, when the position on ground, sucks iron powder or moisture from the peristome of fan, thus occurs bringing dysgenic problem to electric component.On the other hand, when being arranged on the upper side in the source of welding current at fan, owing to forming the structure piled up in the vertical by the parts such as radiator or transformer, thus less to the configuration tolerance of parts.In addition, the cleaning of radiator is more difficult.
Summary of the invention
The object of the invention is to, supply a kind of source of welding current, it can reduce the harmful effect to electric component of iron powder or the moisture generation sucked by fan, and can easily clean the radiator being provided with electric component.
In order to solve above-mentioned problem, Section 1 of the present invention is a kind of source of welding current, it is characterized in that, possesses: casing; Wind path, it is configured at the rear portion of this casing, and the direction, face, both ends along described casing is that lengthwise shape extends, and length direction both ends become the outlet of wind; First fan, it is arranged at the length direction pars intermedia of the rear of this wind path and sends into wind; Radiator, it is arranged at the anterior face of described wind path, form multiple fin, and the first electric component is configured in the back side at described first fan side, and the wind from described first fan contacts with right angle orientation with this radiator; Second fan, it is being more installed on the upper baffle plate be located in described casing by the side, anterior face of casing than described wind path, and the second electric component be arranged in the inner space of described casing is cooled, the bottom faces of described casing is formed outlet and the ventilation hole of the wind sent from described second fan.
Section 2 of the present invention is the source of welding current described in Section 1, it is characterized in that, described wind path is surrounded formed by the rear of described casing, face, described both ends and bottom faces and described radiator, described upper baffle plate.
Section 3 of the present invention is the source of welding current described in Section 1, it is characterized in that, described wind path is surrounded by the rear of described casing, face, described both ends and described bottom faces, described upper baffle plate and the vertical wall that is arranged on the position opposed with described rear and forms, described radiator is arranged on described vertical wall, and described first electric component is by being formed at the peristome of this vertical wall and being configured in the back side of described radiator.
Section 4 of the present invention is the source of welding current described in any one in the first to Section 3, it is characterized in that, described first electric component is electronic unit, and described second electric component is reactor or transformer.
Invention effect
The source of welding current of the present invention can eliminate the harmful effect to the first electric component and the second electric component that the iron powder that sucked by the first fan or moisture produce, and reduce the amount of iron powder or the moisture sucked by the second fan, and easily carry out the cleaning of the radiator being provided with the first electric component.
Accompanying drawing explanation
Fig. 1 is the figure of the internal structure representing the source of welding current of the present invention.
Fig. 2 is the figure of the common circuit structure representing welding circuit.
In figure: 1-source power supply, 2-primary side rectifier, 4-smmothing capacitor, 5-inverter circuit, 6-control circuit, 7-transformer, 8-secondary side rectifier, 9-primary side reactor, 10-current detector, 11-lead-out terminal, the 19-source of welding current, 20-casing, the anterior face of 20a-, 20b-rear, 20c, face, 20d-both ends, 20e-upper side, 20f-bottom faces, 21-first fan, 22-vertical wall, 23-radiator, 23a-base portion, 23b-fan, 24-upper baffle plate, 25-wind path, 26-the-electric component, 27-second fan, 28-suction hole, 29-ventilation hole, 30-second electric component, 31-wheel, 33-inner space.
Embodiment
Based on embodiment, with reference to accompanying drawing, working of an invention mode is described.Fig. 1 is the figure of the internal structure representing the source of welding current of the present invention, is the figure observing the source of welding current from the side with figure (A), is C-C direction view with figure (B).In same figure, the casing 20 of the source of welding current 19 is made up of anterior face 20a, rear 20b, face, both ends 20c, 20d, upper side 20e and bottom faces 20f, and is arranged on respectively on framework.Be provided with the first fan 21 at rear 20b, the vertical wall 22 opposed with rear 20b is relative to the rear portion of bottom faces 20f arranged perpendicular in the inside of the source of welding current 19.The base portion 23a of metal radiator 23 is fixed with in the first fan 21 side (Y2 direction) of this vertical wall 22, first fan 21 side (Y2) of the base portion 23a of this radiator being formed with multiple fin 23b, improving radiating effect by increasing surface area.The Width of this fin 23b is towards the direction of 21 of the first fan (Y2 direction), the 20c-20d direction, face, both ends that the length direction (X1-X2 direction) of fin 23b is casing 20.These fin 23b is (Z1-Z2 direction) arrangement along the vertical direction, and is admitted to from the mode that the wind facies of the first fan 21 contacts with right angle orientation for radiator 23.
Upper baffle plate 24 is provided with on the top of the inside of casing 20.Surrounded by a part for a part of the rear 20b of casing, a part of face, both ends 20c, 20d and radiator 20C, vertical wall 22, upper baffle plate 24, a part of bottom faces 20f and formed the rectangular-shaped wind path of cross section 25.Face, both ends 20c, the 20d of casing at the place, both ends of this wind path 25 are formed with the ventilation hole (omitting diagram) of the wind that blowout is sent from the first fan 21 respectively, and this wind path 25 extends on 20c-20d direction, face, both ends (X1-X2 direction) upper lengthwise shape ground at the rear portion of casing 20.First fan 21 is configured in the roughly pars intermedia of wind path 25.Face, both ends 20c, 20d can dismantle from casing 20.Vertical wall 22 is formed with the peristome less than the back side (Y1 direction) of radiator 23, and the first electric component 26 as primary side rectifier, transistor and secondary side rectifier is directly installed on the back side of radiator 23 with screw etc. by this peristome through.Thus, the heat of the first electric component 26 transmits rapidly to radiator 23.Peristome is blocked by the back side of the base portion 23a of radiator.Smmothing capacitor 4 is configured on upper baffle plate 24.
20a side, face, ratio wind path 25 more forward portion (Y1 direction) in casing 20, is provided with the second fan 27 at the upper baffle plate 24 of casing 20.Be formed for by the suction hole 28 of the second fan 27 from external air suction on the top of face, both ends 20c, 20d of casing.Suction hole 28 is made up of multiple little shutter, and is configured in overhead high position.And, the bottom faces 20f of casing is formed multiple ventilation holes 29 of the wind that blowout is sent from the second fan 27.Transformer, primary side reactor i.e. the second electric component 30 is installed in the bottom faces 20f of casing, and by the second fan 27, these second electric components 30 are cooled.At the lower surface of bottom faces 20f, support multiple wheel 31 via bracket axle, the source of welding current 19 can be moved by these wheels 31.Control circuit 6 is configured in the top of casing.Anterior face 20a, the rear 20b of casing, face, both ends 20c, 20d and bottom faces 20f, vertical wall 22 and upper baffle plate 24 are such as metal.
Filter is arranged on the suction hole 28 being sucked extraneous air by the second fan 27, thus can dust-proof effect be improved.In addition, also can closing air door when not using the source of welding current at the subsidiary air door of this suction hole 28, to make iron powder or moisture enter, opening air door when using the source of welding current.
Below, work is described.The source of welding current 19 of the present invention can factory etc. on the ground iron powder pile up or the iron powder that aloft swims environment under use.At work, the first electric component 26 and the second electric component 30 generate heat the source of welding current 19 and temperature rises.The heat of the first electric component 26 is delivered in the air of inner space 33, and is directly delivered to radiator 23.Now, because radiator 23 is formed by metal, therefore conductive coefficient is greater than air, and the thermal efficiency of the first electric component 26 transmits to radiator 23 well.The heat being delivered to radiator 23 dispels the heat in the air of wind path 25 by multiple fin 23b efficiency well.In addition, the heat being delivered to radiator 23 is also delivered to face, both ends 20c, 20d and the bottom faces 20f of vertical wall 22 and casing, and this heat is dispelled the heat in inner space 33 or extraneous air.On the other hand, with regard to the second electric component 30, coiler part generates heat, and this heat is delivered in the air of inner space 33.
When the first fan 21 works, the extraneous air of the periphery of the peristome that the rear 20b of casing is formed, be taken in wind path 25 by the first fan 21, this wind facies directly contacts with right angle orientation for radiator 23, is divided into two-way along fin 23b and flows to length direction (X1-X2 direction).Then, this wind is externally blown from the ventilation hole at the both ends of wind path 25.In wind path 25, about being the half of wind path 25 entire length from the first fan 21 to the distance of the ventilation hole at the both ends of wind path 25, therefore, wind is promptly externally discharged.Now, owing to capturing heat from the surface of fin 23b, therefore radiator 23 efficiency is cooled well, and is also cooled well by efficiency via this radiator 23, first electric component 26.
Wind path 25 is surrounded by a part for a part of a part of a part of the rear 20b of casing, face, both ends 20c, 20d, bottom faces 20f, vertical wall 22, upper baffle plate 24, therefore, the air being sent to radiator 23 can not be admitted in the inner space 33 after being provided with the first electric component 26, does not directly contact the first electric component 26 and the second electric component 30.Thus, even if send into from the first fan 21 air containing iron powder or moisture also do not cause harmful effect to the first electric component 26 and the second electric component 30.Therefore, need not consider dust-proof or antidrip to the first fan 21 of cooling radiator 23, the peristome in approximate same size with the first fan 21 can be formed at the rear 20b of casing, and the first fan 21 is configured in overhead near position.The heat being delivered to radiator 23 is also delivered to vertical wall 22, face, both ends 20c, 20d of casing and bottom faces 20f, thus this heat is dispelled the heat in inner space 33 or extraneous air.
Then, when the second fan 27 works, the extraneous air of the periphery of the suction hole 28 formed on the top of face, both ends 20c, 20d of casing, be taken in inner space 33 by the second fan 27, this wind directly contacts with the second electric component 30, and this wind blows out from the ventilation hole 29 being formed in bottom faces 20f.Now, because wind directly contacts the coiler part of the second electric component 30, therefore heat is captured well from coiler part efficiency.
The suction inlet of the wind of the second fan 27 is the suction hole 28 that the multiple little shutter offered by the top of face, both ends 20c, 20d at casing is formed, so these suction holes 28 are in the position leaving ground, in addition, because suction hole 28 is made up of more little shutter, therefore the blast in suction hole 28 diminishes, thus iron powder or the less clean air of moisture can be taken in inner space 33.Therefore, the terminal of the second electric component 30 can not adhere to iron powder or moisture.In addition, the direction from the wind of the second fan 27 is from down upper, even if therefore iron powder or moisture invade inner space 33 and also easily externally discharges from the multiple ventilation holes 29 being formed at bottom faces 20f.
When the first fan work 21 of the source of welding current 19 works, iron powder enters together with moisture, therefore, after the long time uses, enters iron powder and pile up in the gap of the fin 23b of radiator.The radiating effect of radiator 23 reduces in this condition, therefore needs regularly to use jet gun to clean radiator 23.In this operation, face, both ends 20c, 20d of casing be arranged on the screw on framework as long as unload and open face, both ends 20c, 20d, just exposing the both ends of radiator 23.Then, by the air ejiction opening of jet gun from the outlet of a side of wind path 25 towards the inside of wind path 25, compressed air is sprayed.This compressed air becomes the jet flow of the length direction (X1 or X2 direction) along wind path 25, thus is blown with sudden force towards the outlet of the opposing party by the iron powder being deposited in fin 23b and fly.So, radiator 23 can be cleaned simply.
In addition, the compressed-air actuated injection direction ejected by jet gun is the direction of the length direction (X1 or X2 direction) along wind path 25, and becomes the direction intersected relative to the air blast direction (Y1 direction) of the first fan 21.Thus, the jet flow of direct effect blast is not easy from the compressed air of the jet gun blade become for the first fan 21.Therefore, when using the dedusting operation of jet gun, the first fan 21 high speed reverse rotation can not be made due to compressed-air actuated stronger jet flow, and there is not the blade of this first fan 21 and the situation of swivel bearing breakage.
Consequently, in the source of welding current of the present invention, the iron powder or moisture that are sucked by the first fan 21 can be eliminated and the harmful effect to the first electric component 26 and the second electric component 30 produced, and reduce the amount of iron powder or the moisture sucked by the second fan 27, and easily carry out the cleaning of the radiator 23 being provided with the first electric component 26.
In addition, with regard to the source of welding current 19 of the present invention, not that the first electric component 26 and the second electric component 30 that are arranged on radiator 23 are separated with partition member by the source of welding current of conventional art like that.That is, the first electric component 26 and the second electric component 30 are configured in identical inner space 33.Thus, due to the distance of configuration first electric component 26 and the second electric component 30 can be shortened, the length of the power transmission line connecting them can be shortened and reduce the loss of cable, thus the efficiency of the source of welding current improves.In addition, because the line length of power transmission line shortens, therefore reduce costs.
In addition, above-mentioned wind path 25 is surrounded by a part for a part of a part of a part of the rear 20b of casing, face, both ends 20c, 20d, bottom faces 20f, vertical wall 22 and upper baffle plate 24, radiator 23 is arranged on the first fan 21 side (Y2 direction) of vertical wall 22, vertical wall 22 forms peristome, and the first electric component 26 is configured in the back side of radiator 23 by this peristome.Also can be replaced in this, radiator 23 is formed as the size extending to the upper baffle plate 24 of casing and face, both ends 20c, 20d of casing, thus omit vertical wall 22.Accordingly, wind path is surrounded by a part for a part of the rear 20b of casing, a part of face, both ends 20c, 20d and bottom faces 20f, radiator 23 and upper baffle plate 24 and is formed.Now, radiator 23 can be directly installed on the upper baffle plate 24 of casing, therefore, it is possible to improve radiating effect further.Also around radiator 23, such as the dust-proof materials such as foam rubber can be installed.
In addition, between face, both ends 20c, 20d when Existential Space of the surrounding of radiator 23 and upper baffle plate 24 or casing, also can replace and above-mentioned vertical wall 22 is set, the dividing plate only blocking these spaces is arranged on radiator 23 around.
Claims (2)
1. a source of welding current, is characterized in that, has:
Casing;
Wind path, it is configured in the rear portion of described casing, and the direction, face, both ends along described casing is that lengthwise shape extends, and length direction both ends are the outlet of wind;
First fan, it is arranged on the length direction pars intermedia of the rear of described wind path and sends into wind;
Radiator, it is arranged on the anterior face of described wind path, be formed with multiple fin at described first fan side and be configured with the first electric component overleaf, after contacting with the rectangular direction of this radiator from the wind of described first fan, be divided into two-way along described fin to length direction and flow, being then externally blown from the length direction both ends of described wind path;
Second fan, it, being more arranged on by the side, anterior face of casing the upper baffle plate be located in described casing than described wind path, cools the second electric component be located in the inner space of described casing,
Outlet as the wind sent from described second fan and ventilation hole is formed in the bottom faces of described casing,
Described wind path is surrounded by the rear of described casing, face, described both ends and described bottom faces, described upper baffle plate and the vertical wall that is arranged on the position opposed with described rear and forms,
Described radiator is arranged on described vertical wall, and described first electric component is by being formed at the peristome of this vertical wall and being configured in the back side of described radiator.
2. the source of welding current according to claim 1, is characterized in that,
Described first electric component is electronic unit, and described second electric component is reactor or transformer.
Applications Claiming Priority (8)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP2010053085A JP2011188671A (en) | 2010-03-10 | 2010-03-10 | Power supply apparatus |
| JP2010-053085 | 2010-03-10 | ||
| JP2010-056937 | 2010-03-15 | ||
| JP2010056937A JP5764295B2 (en) | 2010-03-15 | 2010-03-15 | Power supply |
| JP2010074438A JP5596389B2 (en) | 2010-03-29 | 2010-03-29 | Power supply |
| JP2010-074438 | 2010-03-29 | ||
| JP2010-256508 | 2010-11-17 | ||
| JP2010256508A JP5641645B2 (en) | 2010-11-17 | 2010-11-17 | Welding power source |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| CN102189358A CN102189358A (en) | 2011-09-21 |
| CN102189358B true CN102189358B (en) | 2015-09-30 |
Family
ID=44598698
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201110060009.8A Expired - Fee Related CN102189358B (en) | 2010-03-10 | 2011-03-10 | The source of welding current |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN102189358B (en) |
Families Citing this family (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN103273228B (en) * | 2013-05-30 | 2015-04-08 | 四川东方能源科技股份有限公司 | Multidirectional heat control device |
Citations (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US5706668A (en) * | 1994-12-21 | 1998-01-13 | Hilpert; Bernhard | Computer housing with cooling means |
| CN101039773A (en) * | 2005-10-11 | 2007-09-19 | 松下电器产业株式会社 | welding device |
Family Cites Families (8)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| TW283274B (en) * | 1994-11-08 | 1996-08-11 | Sansha Denki Seisakusho Co Ltd | |
| JP2001267774A (en) * | 2000-03-23 | 2001-09-28 | Furukawa Electric Co Ltd:The | Case for housing equipment |
| US6489591B1 (en) * | 2000-04-10 | 2002-12-03 | Illinois Tool Works Inc. | Cooling air circuits for welding machine |
| JP4155234B2 (en) * | 2004-06-24 | 2008-09-24 | 松下電器産業株式会社 | Arc welding control device |
| US20060185832A1 (en) * | 2005-02-23 | 2006-08-24 | Asia Vital Component Co., Ltd. | Heat radiation module with transverse flow fan |
| JP2007109707A (en) * | 2005-10-11 | 2007-04-26 | Matsushita Electric Ind Co Ltd | Electric apparatus |
| US7800901B2 (en) * | 2006-09-13 | 2010-09-21 | Hypertherm, Inc. | Power supply cooling apparatus and configuration |
| JP4798287B2 (en) * | 2008-02-06 | 2011-10-19 | パナソニック株式会社 | Electrical equipment |
-
2011
- 2011-03-10 CN CN201110060009.8A patent/CN102189358B/en not_active Expired - Fee Related
Patent Citations (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US5706668A (en) * | 1994-12-21 | 1998-01-13 | Hilpert; Bernhard | Computer housing with cooling means |
| CN101039773A (en) * | 2005-10-11 | 2007-09-19 | 松下电器产业株式会社 | welding device |
Also Published As
| Publication number | Publication date |
|---|---|
| CN102189358A (en) | 2011-09-21 |
Similar Documents
| Publication | Publication Date | Title |
|---|---|---|
| CN102195455B (en) | Power supply apparatus | |
| JP4687106B2 (en) | Air compressor cooling system | |
| US9433123B2 (en) | Electric apparatus | |
| US9730360B2 (en) | Shroud for an electrical enclosure | |
| KR101196001B1 (en) | radiation system for photovoltaic generating apparatus | |
| CN108029220B (en) | Inverter for converting DC voltage to AC voltage | |
| CN102189311B (en) | Power supply apparatus | |
| JP6615326B2 (en) | Motor drive device and air conditioner | |
| JP5041047B2 (en) | Air compressor cooling system | |
| CN102189358B (en) | The source of welding current | |
| CN209386437U (en) | Electrical apparatus box, outer machine of air-conditioner and air conditioner | |
| CN204629835U (en) | The protection structure of semiconductor element and the off-premises station of air conditioner | |
| CN104620485B (en) | The convertor device of air conditioner | |
| JP5641645B2 (en) | Welding power source | |
| CN213403752U (en) | Energy-saving management frequency converter used on fan | |
| CN109952007A (en) | A kind of electronic product of high protection | |
| CN107807596A (en) | Electric-power metering goods and materials week switch cabinet supervising device | |
| CN208767102U (en) | A high-frequency transformer with efficient heat dissipation | |
| CN202873253U (en) | Anti-pollution device | |
| CN113707410A (en) | High-heat-dissipation transformer equipment for power transmission and transformation system | |
| AU2018281095B2 (en) | Outdoor unit of refrigeration apparatus | |
| JP6575914B2 (en) | Power converter | |
| CN219938805U (en) | Integrated power supply cabinet | |
| JPWO2017199304A1 (en) | Motor drive device and air conditioner | |
| CN222655022U (en) | A heat dissipation structure for electrical converter |
Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| C06 | Publication | ||
| PB01 | Publication | ||
| C10 | Entry into substantive examination | ||
| SE01 | Entry into force of request for substantive examination | ||
| C14 | Grant of patent or utility model | ||
| GR01 | Patent grant | ||
| CF01 | Termination of patent right due to non-payment of annual fee |
Granted publication date: 20150930 Termination date: 20170310 |
|
| CF01 | Termination of patent right due to non-payment of annual fee |